TECHNICAL FIELD OF THE INVENTION

The present invention relates generally to an air conditioning system. Particularly, the instant invention relates to an inverter model air conditioning system. Further, more particularly, the present invention relates to an inverter controlled air conditioner having a controller Printed Circuit Board (PCB).

BACKGROUND AND THE PRIOR ART

An inverter is an electronic device or circuit which is used to change Direct Current (DC) to Alternating Current (AC). The inverter in air conditioner is used to convert fixed frequency AC power to DC power and DC power to variable frequency AC power. The inverter air conditioning units have increased efficiency in contraction to traditional air conditioners, extended life of their parts and the sharp fluctuations in the load are eliminated. This makes the inverter air conditioner units with lower operating cost due to higher efficiency.

The conventional inverter air conditioner includes an AC/DC converter for changing AC power to DC power and vice versa, an indoor unit and an outdoor unit. The outdoor unit is installed outside the room and includes a compressor and a controller and is fixed to an outside wall. A lot of heat is generated by the condenser and compressor of the outdoor unit, so sufficient flow of air is required in the outdoor unit. The compressor of outdoor unit is regulated by the controller which primarily is an electronic circuit board having a logic circuit and a three phase variable frequency inverter. The frequency of the inverter is increased when the set temperature of indoor unit is lowered or heat load gets increase in the room. Further, the logic circuit limits the upper frequency of inverter controller for protection of the inverter controller from high temperature resulting lower cooling capacity. However, in such systems, the efficiency is less and the failure of the controller in the outdoor unit is also reported due to the high temperature outside the room.
The indoor unit is installed inside the room and includes evaporator coil or the cooling coil, air filter, cooling fan or blower, drain pipe and louvers or fins. The cooling coil is made up of copper coil which is covered with Aluminum fins for maximum cooling inside the room. The air filter is used to move all the dirt/dust particles from the room air and helps supplying clean air to the room. The cooling fan is used to suck the hot air present inside the room and provide cool and clean air. The drain pipe is used to remove the condensed water to outside the room. The cool air supplied by the blower is passed into the room through fins. The fins are used for changing the angle or direction in which the air needs to be supplied into the room as per the requirements of the user.

The DC inverter controller is consisting of a rectifier, an active power factor controller and an inverter which is used for changing AC power to DC power and further changing DC power to variable frequency AC power as decided by the logic parameters of controller. The inverter is used to control the speed of the compressor and the cooling/heating output. The inverter converts the incoming AC current to DC current and then through a modulation in an electrical inverter produces current of desired frequency. The inverter air conditioning units have increased efficiency with respect to traditional air conditioners, extended life of their parts and the sharp fluctuations in the load are eliminated. This results is in the lesser consumption of power. Further, one of the developments in inverter air conditioner was that a microcontroller was developed and introduced as an instrument to sample each ambient air temperature and adjust accordingly the speed of the compressor.

There are certain measures which can be taken for modification and assembly of the parts of an air conditioner. The prior art is replete with the teachings of making the indoor unit of an air conditioner, compact to facilitate installation inside the house. One such measure is disclosed in US 7,095,208 which teaches employing an inverter controller for driving a motor, which uses a small capacity reactor and a small capacity capacitor, which leads to reduction in size of the entire unit, though the said inverter controller unit is placed in/as the outdoor unit. The problem which still arises is the effect of rising outside temperature on the components of the controller which have low melting points.

Furthermore, Chinese patent application CN 101440982 discloses the arrangement whereby the components of the controller in the outdoor unit are segregated to protect them from the heat generated via their individual functioning.

US 7260451 discloses an air conditioner management system and converter unit. US ‘451 discloses that the converter unit is used to monitor and control the air conditioner and is connected to a monitor apparatus and an air conditioner. The converter unit includes the following:
i. PAC transmission software- used for transmitting a setting data from the monitor apparatus regarding a running start/stop state, a running node, an air quality and a temperature, respectively of the air conditioners, to a transmission path, and for receiving running data regarding a temperature and a pressure of a component during the refrigerating cycle from the transmission path;
ii. transmission software – used for receiving the setting data from the monitor apparatus and transmitting the running data to the monitor apparatus; and
iii. a converter- to convert the running data, and to convert the setting data respectively, wherein the running data is collected from the control message at a predetermined interval, and the collected running data is transmitted to the monitor apparatus; and wherein the setting data is transmitted to the transmission path if the setting data is changed.

US 5673568 describes and discloses an apparatus for controlling an air conditioner having a variable speed compressor to circulate a refrigerant in a refrigerating circuit. US ‘568 discloses that the control apparatus for the air conditioner comprises-
a. means for generating a rotational speed pattern for the compressor from the start of operation of the air conditioner until operation of the air conditioner is stopped;
b. a controller having an operable button; and
c. means for controlling the rotational speed of the compressor to follow the generated rotational speed pattern, wherein the controlling means includes means for directly changing the rotational speed of the compressor by a predetermined value in response to an operation of the operable button.
Further, the control apparatus for the air conditioner of US ‘568 provides an improved method for controlling an air conditioner and stable temperature control.

US 6729153 relates to an indoor unit in air conditioner which is arrange symmetrically to provide a compact design and increases the reliance. Further, US ‘153 specifically disclose that the indoor unit in an air conditioner is free from the limitation of installing location. However, US ‘153 enable to overcome the problem of electric short circuit of the fan motor due to the condensed water since the fan motor and pipe part are left apart centering around the blower.

In the conventional inverter air conditioner, currently available, usually the components of the outdoor unit of the air conditioner get damaged due to its presence outside the room and the constant exposure to the external weather conditions. Further, in the conventional inverter air conditioner, the controller PCB is placed in the outdoor unit of air conditioner far from indoor unit and is not a compact system. The placement of controller PCB as/in outdoor unit hence leads to the damage due to direct exposure to the external harsh weather conditions. Thus, there exists a need in the art for the air conditioners which are durable i.e. comprising components which have a longer life span, more efficient and thereby making them economical and beneficial for the customers/consumers.

However, despite the developments in the conventional air conditioner, a need is felt for more effective, durable, economical, compact and efficient inverter air conditioner. So, the present invention is resulted which includes an effective, durable, economical, compact and efficient improved inverter air conditioner has equipped with improved controller PCB which is not placed in the outdoor unit and is either placed inside the indoor unit of air conditioner or as a separate unit anywhere inside the room.

The present invention henceforth solves the problem of the failure and short-lived nature of the working of the controller PCB due to exposure to harsh external weather conditions and also enhances the efficiency of the system.

It is therefore an object of the present invention to provide a compact and efficient air conditioner in which controller PCB is placed inside the room either inside the indoor unit or as a separate unit anywhere in the room. Further, another object of the instant invention is to provide a compact inverter air conditioner which can be easily repaired and serviced. Further, it is also an object of the present invention is to protect the improved controller PCB of inverter air conditioner from occasional failure due to harsh weather conditions and thereby reducing the overall cost of maintenance of the air conditioner.

Another object of the present invention is to reduce the cost of controller PCB by reducing the component rating specification of electronic circuit board as per indoor temperature conditions.

SUMMARY OF THE INVENTION

The present invention provides an improved inverter air conditioner wherein a controller PCB is improved by changing the working parameters to work at optimum and/or adverse conditions and placing it inside the room in external frame/as separate unit or in the indoor unit without obstruction to the circuit of indoor unit. The present invention provides an economical inverter air conditioner system to work at optimum and/or adverse conditions, the economical inverter air conditioner system comprising: an outdoor unit; and an indoor unit including indoor and outdoor control unit wherein controller PCB is placed inside the room in external frame/as separate unit or in the indoor unit without obstruction to the circuit of indoor unit.

Further, the present invention also provides an economical and compact inverter air conditioner system to work at optimum and/or adverse conditions wherein power factor correction is regulated.

The present invention also relates to an improved controller PCB to provide more efficient and economical inverter air conditioner wherein protection parameters such as protection limit of Intelligent Power Module (IGBT) from excessive heat of the inverter air conditioner have been changed to work at optimum and/or adverse conditions. This enables the inverter to run at comparably higher frequencies in same ambient conditions, resulting higher cooling capacity and slightly higher power but overall increased energy efficiency ratio.

The improved inverter air conditioner provides placement of the controller PCB inside the room in external frame/as separate unit or in the indoor unit without obstruction to the circuit of indoor unit which results in protection of the controller unit from the humidity, dust and harsh environmental conditions. The resulting advantage is better cooling capacity and efficiency by placing the controller PCB in the indoor unit or as a separate unit inside the room. Further, the controller PCB is coupled with the change controlled production parameters and has been improved and it makes the improved inverter air conditioner easily maintainable, repairable and economical.

Thus, the components of improved inverter air conditioner required to fabricate the electronic circuit board assembly for controller PCB also do not need to be high temperature resistant, resulting in low cost of the electronic circuit board assembly and also leading to better performance of the same and less chances of failure due to low ambient temperature of indoor room. The aforesaid technical advancement is achieved by positioning the improved controller PCB inside the room in a separate box or inside the indoor unit of the improved inverter air conditioner.

The improved inverter air conditioner provides placement of the controller PCB inside the room in external frame/as separate unit or in the indoor unit without obstruction to the circuit of indoor unit which results in facilitation of maintenance and repair as the controller PCB is easily accessible.

Other aspects, advantages, and salient features of the present invention will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses exemplary embodiments of the invention. Reference will now be made to the accompanying diagrams which illustrate, by way of an example, and not by way of limitation, of one possible embodiment of the invention.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS

The following drawings are illustrative of particular examples for enabling methods of the present invention, are descriptive of some of the methods, and are not intended to limit the scope of the invention. The drawings are not to scale (unless so stated) and are intended for use in conjunction with the explanations in the following detailed description.

Figure 1 illustrates the design of the wiring and control diagram of conventional inverter air conditioner.

Figure 2 illustrates the wiring and control diagram of the inverter air conditioner as disclosed in the present invention.

Figure 3 depicts the increased efficiency of the improved inverter air conditioner as disclosed in the present invention, compared to the conventional air conditioner.

Figure 4 depicts the increased cooling capacity of the improved inverter air conditioner as disclosed in the present invention, compared to the conventional air conditioner.

Figure 5 depicts the increased free running frequency of the improved inverter air conditioner as disclosed in the present invention, compared to the conventional air conditioner.

Figure 6 depicts the decreased IGBT (Insulated Gate Bipolar Transistor) temperature of the improved inverter air conditioner as disclosed in the present invention, compared to the conventional air conditioner.

Figure 7 depicts the decreased filter capacitor temperature of the improved inverter air conditioner as disclosed in the present invention, compared to the conventional air conditioner.

Figure 8 shows the cross-sectional view of the conventional air conditioner in which the controller PCB is placed inside the outdoor unit of the air conditioner.

Figure 9 shows the implementation of the present invention using the air conditioner and improved controller PCB.

Persons skilled in the art will appreciate that elements in the figures are illustrated for simplicity and clarity and may have not been drawn to scale. For example, the dimensions of some of the elements in the figure may be exaggerated relative to other elements to help to improve understanding of various exemplary embodiments of the present disclosure.

Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures.

DETAILED DESCRIPTION OF THE EMBODIEMENTS

The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of exemplary embodiments of the invention as defined by the claims and their equivalents. It includes various specific details to assist in understanding but these are to be regarded as merely exemplary. Accordingly, person skilled in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness. The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the invention. Accordingly, it should be apparent to the person skilled in the art that the following description of exemplary embodiments of the present invention are provided for illustration purpose only and not for the purpose of limiting the invention as defined by the appended claims and their equivalents.

It is to be understood that the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise.

The present invention provides an improved inverter air conditioner wherein an improved controller PCB is placed inside the room in external frame/as separate unit or in the indoor unit without obstruction to the circuit of indoor unit. Further, the improved and economical inverter air conditioner includes the improved controller PCB which is placed inside the room in external frame/as separate unit or in the indoor unit without obstruction to the circuit of indoor unit.

In the conventional inverter model air conditioner (also called as DC inverter model) the controller PCB is placed in the outdoor unit of the air conditioner. The outdoor unit always remains in contact with open atmosphere and hanged on high rise buildings/outside walls/outside floor etc. and is under mishandled due to high or low ambient temperatures/rains/ humidity/snow/ moisture /humidity /dust etc. Maintenance and repair of such outside placed controller PCB is a challenge. The wiring and control diagram of the conventional inverter air conditioner is diagrammatically shown in Figure 1, wherein the controller PCB is placed in the outdoor unit.

Figure 1 illustrates the wiring and control diagram of conventional inverter air conditioner. The controller PCB in the said arrangement is placed in the outdoor unit and outside the room. Figure 1 shows the conventional inverter air conditioner (100) having an indoor unit (100A) and an outdoor unit (100B). Figure 1 explains the internal construction of indoor unit (100A) and outdoor unit (100B) of the conventional air conditioner 100, explaining the arrangement for the controller Printed Circuit Board (PCB). The indoor unit (100A) and outdoor unit (100B) of the conventional air conditioner 100 is connected through the wires (101).

The outdoor unit (100B) includes outdoor control unit (15) which contains rectifiers (1) and (2) which are used to provide power supply to the conventional inverter air conditioner (100). Rectifier circuits are often classified by the number of current pulses that flow to DC side of the rectifier per cycle of AC input voltage. Thus, rectifiers (1) and (2) are required for the flow of power supply from main connection to the conventional inverter air conditioner (100). The rectifier (1) converts 230V AC to 310V DC and SMPS 14 provides 5V and 12V power supply, which is required to run controller PCB. Further, the rectifier (2) is connected to Power factor correction unit (7) which is connected to compressor drive (5). The rectifier (2) is connected to Power factor correction unit (7) through filter capacitor (4). The filter capacitor (4) is used to store the electrical energy and give this energy again to the circuit when there is need by the conventional inverter air conditioner (100). Further, the filter capacitor (4) locks the flow of AC and permits the flow of DC so that the conventional inverter air conditioner functions properly. The Power factor correction unit (7) is used for switching and maintaining the power factor and is usually maintained at 0.90 - 0.99.

The Power factor correction unit (7) is further connected to compressor drive (5). Further, the compressor drive (5) is connected to compressor motor (6) which is used to run the compressor pump (31) and compressor pump (31) compress the refrigerant. The compressor motor (6) and compressor pump (31) are important components of the refrigerant cycle. The compressor motor (6) uses a compressor drive (5) to power it’s motor, such that the compressor pump (31) intakes the requisite amount of refrigerant from system, and compresses the refrigerant in the limited space to increase the pressure of refrigerant and results in release of high pressure and high temperature refrigerant to the condenser coil (34) through reversing valve (32).

The compressor motor (6) is connected to a compressor pumping device (31) which is used to convert the refrigerant vapor from low pressure to high pressure. The compressor pumping device (31) is then connected to a reversing valve (32) which is used to switch the conventional air conditioner (100) into heating mode. The reversing valve (32) is used to reverse the refrigeration cycle i.e when the conventional air conditioner (100) is used in winter to increase the room temperature. The reversing valve (32) reverse the refrigeration cycle and is used for the purpose of heating of the room. The reversing valve (32) is connected to evaporator (33) and condenser (34). The evaporator (33) is used in the refrigeration cycle to evaporate the liquid refrigerant into vapor or other gaseous form and results into cooling by absorbing the heat during evaporating process. The evaporator (33) also includes an indoor fan motor (36) to pass the hot air of room to the evaporator and discharge the cool air to the room.

The condenser coil (34) is used to condense the refrigerant vapor into liquid by exchanging it’s latent heat of condensation during a refrigeration cycle of the conventional inverter air conditioner (100). The condenser coil (34) includes an outdoor fan motor (37). The outdoor fan motor (37) is used for blowing outside air through the condenser to condense the refrigerant by taking away the latent heat of condensation. The condenser fan motors (37) is controlled by inverter controller PCB.

The evaporator (33) and condenser (34) are connected to throttling device (35) which is used to reduce the pressure and temperature of the refrigerant. The high pressure and high temperature state of the vapor refrigerant goes to the throttling device (35) which is used to convert the high pressure and high temperature liquid into low pressure and low temperature.

The active power factor correction circuit (7) is connected to an inverter controller circuit (16) through power factor controller. The inverter control circuit (16) is a microcontroller and having CPU including internal timer and peripheral circuits e.g. waveform LSI and base drive circuit. The inverter control circuit (16) is further connected to sensor which senses the ambient temperature. The inverter control circuit (16) is then connected to a drive circuit (26) which is then connected to reversing valve (32), throttling device (35) and outdoor fan motor (37).

Further, the Power factor correction unit (7) is also connected to the rectifier (2) which is then connected to mains supply. The input of rectifier (1) is connected to mains supply and output is connected to switching converter (14) through resistor (12) and filter capacitor (13),which is a DC to DC converter and provide the low voltage DC supplies, which is required for the functioning of inverter controller (16). The required Direct Current are 5V and 12 V. The inverter controller (16) is then also connected to the circuit (26) which is then connected to reversing valve (32), throttling device (35) and outdoor fan motor (37).

Further, the indoor unit (100A) of the conventional air conditioner (100) includes an indoor unit control section (40). The indoor unit (100A) receives a power supply from the main wiring connection. The indoor unit control section (40) is connected through different sensors. The indoor unit control section (40) is connected through sensor (28) which senses the room temperature and evaporator pipe temperature. The indoor unit control section (40) is also connected through another sensor (infrared) which receives start/stop instruction from the user. The indoor unit control section (40) is also connected through another sensor which is for temperature setting of the room by the user. Further, the indoor unit control section (40) is connected to the inverter control circuit (16) for the connection and communication between the indoor unit (100A) and outdoor unit (100B).

To protect the controller PCB from all harms and to increase its life and performance and increase the efficiency of the air conditioners, an improved inverter air conditioner has been prepared by placing the controller PCB inside the room in a box or inside the indoor unit of improved inverter air conditioner. The improved inverter air conditioner reduces the chances of the damage to the controller PCB through excessive heat. The control diagram of the improved inverter air conditioner (200) of the present invention is shown in Figure 2, wherein the controller PCB has been improved and placed inside the indoor unit. The improved controller PCB is placed such that it does not cause obstruction to the circuit of the indoor unit of the improved inverter air conditioner.

Fig.2 illustrates the wiring and control diagram of the improved inverter air conditioner as disclosed in the present invention. Figure 2 shows the arrangement of the improved inverter air conditioner (200) with improved controller PCB which includes the indoor and outdoor control unit (200A) and outdoor unit (200B). Figure 2 explains the internal construction of the improved inverter air conditioner (200), explaining the arrangement for the improved controller Printed Circuit Board (PCB) (300).

The outdoor and indoor control unit (200A) contains rectifiers (1) and (2) which are used to provide power supply to the conventional inverter air conditioner (200). Rectifier circuits are often classified by the number of current pulses that flow to DC side of the rectifier per cycle of AC input voltage. Thus, rectifiers (1) and (2) are required for the flow of power supply from main connection to the improved inverter air conditioner (200). The rectifiers (1) and (2) converts 230V AC to 310V DC and SMPS 14 provides 5V and 12V power supply, which is required to run controller PCB. Further, the rectifier (2) is connected to Power factor correction unit (7) which is connected to compressor drive (5). The rectifier (2) is connected to Power factor correction unit (7) through filter capacitor (4). The filter capacitor (4) is used to store the electrical energy and give this energy again to the circuit when there is need by the improved inverter air conditioner (200). Further, the filter capacitor (4) locks the flow of AC and permits the flow of DC so that the conventional inverter air conditioner functions properly. The active power factor correction unit (7) is used for switching and maintaining the power factor at an optimum level. In the improved inverter air conditioner (200), the power factor is maintained at 0.9 or above and is not allowed to come below 0.9 i.e. to 0.7 or 0.8.

The Power factor correction unit (7) is further connected to a compressor drive (5). Further, the compressor drive (5) is connected to compressor motor (6) which is used to run the compressor pump (31) and compressor pump (31) compress the refrigerant. The compressor motor (6) and compressor pump (31) are important components of the refrigerant cycle. The compressor motor (6) uses a compressor drive (5) to power it’s motor, such that the compressor pump (31) intakes the requisite amount of refrigerant from system, and compresses the refrigerant in the limited space to increase the pressure of refrigerant and results in release of high pressure and high temperature refrigerant to the condenser coil (34) through reversing valve (32).

The compressor motor (6) is connected to a compressor pumping device (31) which is used to convert the refrigerant vapor from low pressure to high pressure. The compressor pumping device (31) is then connected to a reversing valve (32) which is used to switch the improved air conditioner (200) into heating mode. The reversing valve (32) is used to reverse the refrigeration cycle i.e when the improved air conditioner (200) is used in winter to increase the room temperature. The reversing valve (32) reverses the refrigeration cycle and is used for the purpose of heating of the room. The reversing valve (32) is connected to evaporator (33) and condenser (34). The evaporator (33) is used in the refrigeration cycle to evaporate the liquid refrigerant into vapor or other gaseous form and results into cooling by absorbing the heat during evaporating process. The evaporator (33) also includes an indoor fan motor (36) to pass the hot air of room to the evaporator and discharge the cool air to the room.

The condenser coil (34) is used to condense the refrigerant vapor into liquid by exchanging it’s latent heat of condensation during a refrigeration cycle of the improved inverter air conditioner (200). The condenser coil (34) includes an outdoor fan motor (37). The outdoor fan motor (37) is used for blowing outside air through the condenser to condense the refrigerant by taking away the latent heat of condensation. The outdoor fan motor (37) is controlled by inverter controller PCB.

The evaporator (33) and condenser (34) are connected to throttling device (35) which is used to reduce the pressure and temperature of the refrigerant. The high pressure and high temperature state of the vapor refrigerant goes to the throttling device (35) which is used to convert the high pressure and high temperature liquid into low pressure and low temperature.

The active power factor correction circuit (7) is connected to an inverter controller circuit (16) through power factor controller. The inverter control circuit (16) is a microcontroller and having CPU including internal timer and peripheral circuits e.g. waveform LSI and base drive circuit. The inverter control circuit (16) is further connected to sensor which senses the ambient temperature. The inverter control circuit (16) is then connected to a drive circuit (26) which is then connected to reversing valve (32), throttling device (35) and outdoor fan motor (37).

Further, the power factor correction unit (7) is also connected to the rectifier (2) which is then connected to mains supply. The input of rectifier (1) is connected to mains supply and output is connected to switching converter (14) by fuse resister (12) filter capacitor (13). Switching converter (14) is a DC to DC converter and provides the low voltage DC supplies, which is required for the functioning of inverter controller (16). The required Direct Current is 5V and 12 V. The inverter controller (16) is then also connected to the circuit (26) which is then connected to reversing valve (32), throttling (35) and outdoor fan motor (37).

Further, the indoor and outdoor control unit (200A) of the improved air conditioner (200) includes an indoor unit control section (40). The indoor and outdoor control unit (200A) receives a power supply from the main wiring connection. The indoor unit control section (40) is connected through different sensors. The indoor unit control section (40) is connected through sensor (28) which senses the room temperature. The indoor unit control section (40) is also connected through another sensor which receives starts/stop instruction by the user. The indoor unit control section (40) is also connected through another sensor which is for temperature setting of the air conditioner by the user. Further, the indoor unit control section (40) is connected to the inverter control circuit (16) for the functioning of the improved inverter air conditioner.

Figure 3 shows a comparison of Energy Efficiency Ratio (EER) of the conventional inverter air conditioner (100) with the improved inverter air conditioner (200). The X-Axis shows the increase in value of outdoor ambient temperature in °C and Y-axis shows increase in value of Energy Efficiency Rate (EER). Further, after comparing the EER of conventional inverter air conditioner (100) with the improved inverter air conditioner (200), the improved inverter conditioner shows increased efficiency. The increased efficiency of the improved inverter air conditioner as compared to the conventional air conditioner is shown clearly in Figure 3. It depicts the increased efficiency of the improved inverter air conditioner as disclosed in the present invention, compared to the conventional air conditioner.

Figure 4 shows a comparison of cooling capacity of the conventional inverter air conditioner (100) with the improved inverter air conditioner (200). The X-Axis shows the increase in value of outdoor ambient temperature in °C and Y-axis shows increase in value of cooling capacity in watt i.e. the output energy of the air conditioner. Further, after comparing the cooling capacity of conventional inverter air conditioner (100) with the improved inverter air conditioner (200), the improved inverter conditioner shows increased cooling capacity. The reason of the providing more capacity by the improved inverter air conditioner is the working of the present air conditioner at high frequency. The increased cooling capacity of the improved inverter air conditioner as compared to the conventional air conditioner is shown clearly in Figure 4. It depicts the increased cooling capacity of the improved inverter air conditioner as disclosed in the present invention, compared to the conventional air conditioner.

Figure 5 shows a comparison of running frequency of the conventional inverter air conditioner (100) with the improved inverter air conditioner (200). The X-Axis shows the increase in value of outdoor ambient temperature in °C and Y-axis shows increase in value of running frequency in Hz. Further, after comparing the running frequency of conventional inverter air conditioner (100) with the improved inverter air conditioner (200), the improved inverter conditioner shows increase in running frequency. Further, due to providing more running frequency by the improved inverter air conditioner, it provides working of the present air conditioner at high frequency. The increase in running frequency of the improved inverter air conditioner as compared to the conventional air conditioner is shown clearly in Figure 5. It depicts the increased running frequency of the improved inverter air conditioner as disclosed in the present invention, compared to the conventional air conditioner

Figure 6 shows a comparison of functioning of working temperature of the conventional inverter air conditioner (100) with the improved inverter air conditioner (200). The X-Axis shows the increase in value of outdoor ambient temperature in °C and Y-axis shows increase in value of temperature of IGBT (Insulated Gate Bipolar Transistor) in °C. Further, after comparing the working temperature of conventional inverter air conditioner (100) with the improved inverter air conditioner (200), the improved inverter air conditioner shows to functions at low temperature. Thus, working of the improved inverter air conditioner at low temperature as compared to the conventional air conditioner is shown clearly in Figure 6. It depicts the decreased IGBT temperature of the inverter air conditioner as disclosed in the present invention, compared to the conventional air conditioner.

Figure 7 shows a comparison of filter capacitor temperature of the conventional inverter air conditioner (100) with the improved inverter air conditioner (200). The X-Axis shows the increase in value of outdoor ambient temperature in °C and Y-axis shows increase in value of temperature of filter capacitor in °C. Further, after comparing the working temperature of filter capacitor present in conventional inverter air conditioner (100) with the improved inverter air conditioner (200), the filter capacitor of improved inverter air conditioner shows to functions at low temperature. Thus, working of the filter capacitor of improved inverter air conditioner at low temperature as compared to the conventional air conditioner is shown clearly in Figure 7. It depicts decreased filter capacitor temperature of the inverter air conditioner as disclosed in the present invention, compared to the conventional air conditioner.

Figure 8 shows the cross-sectional view of the conventional air conditioner in which the controller PCB is placed inside the outdoor unit of the air conditioner which results in less durable due to its presence outside the room and contact with the external weather conditions. The damage of components of outdoor unit is usually caused by the external weather conditions. In the conventional inverter air conditioner, the controller PCB is placed in the outdoor unit of air conditioner and it use to get easily damage due to direct contact with the external weather conditions.

Figure 9 shows the implementation of the present invention using the air conditioner having improved controller PCB. After, implementation of the present invention, the controller PCB is placed inside the room in external frame/as separate unit or in the indoor unit without obstruction to the circuit of indoor unit as shown in Figure 9.

Further, the cycle time of an air conditioner is the amount of time the unit runs to maintain the temperature of the room equal to the temperature setting of temperature controller (thermostat) which is a part of control section of the indoor unit. If the thermostat is set a very low temperature as compared to the room temperature, the compressor has to work for a longer time to decrease the room temperature, thus, increasing the cycle time. In other words, greater the temperature difference between the room temperature and thermostat temperature, greater will be the cycle time and vice versa. In a conventional air conditioner, the outside temperature has a direct impact on the controller PCB, however the present invention overcomes this by the positioning of the improved controller PCB within the indoor unit or inside the room as a separate unit coupled with the results in the lowering of the ambient temperature and hence results in the increase in the cooling capacity and a better Energy Efficiency Ratio (EER) of the air conditioner.

The efficiency of the improved inverter air conditioner increases as compared to the conventional air conditioner as the frequency of the improved controller PCB can be increased, as shown in Figure 3. Further, the controller protection parameters have been widened and it can allow the compressor for better output and lower power consumption increment. Also by placing the improved controller PCB indoor, the life of all electronic parts used in the improved controller PCB is drastically increased and the failures of parts due to atmosphere abuse as mentioned above is reduced drastically. The cooling capacity of the inverter air conditioner of the present invention is improved over that of the conventional air conditioner, as the inverter frequency does not get reduced by control circuit at high ambient conditions. The same has been shown in Figure 4 and Figure 5. Furthermore as shown in Figure 6 and Figure 7, the IGBT (Insulated Gate Bipolar Transistor), which is a part of IPM (Intelligent Power Module), temperature and filter capacitor temperature are also found to be low as compared to the conventional air conditioner. Further, the servicing of the improved controller PCB becomes easy as it is in the indoor against the present conventional way of keeping and placing the controller PCB in the outdoor side of the air conditioner. The failures goes down, efficiency goes up, cost goes down, serviceability becomes easy of controller PCB as this is kept inside the room are the major advantages. Thus, as the improved controller PCB is kept inside the room the parts of controller PCB will have longer life and alternate electronic parts can be used which are less in cost and the controller PCB cost goes down.

Presently the high specification electronics parts are used to protect the improved controller PCB from heat etc. which is generated by controller PCB parts as well as ambient heat and temperatures. When the improved controller PCB is kept inside the room it is well in controlled atmosphere and less prone to failures. Although the embodiments herein are described with various specific embodiments, it will be obvious for a person skilled in the art to practice the embodiments herein with modifications. However, all such modifications are deemed to be within the scope of the claims.

Further, energy efficiency of the improved inverter air conditioner is better where the improved controller PCB is placed inside the room or inside the indoor unit as compared to the conventional inverter air conditioner (Refer Figure 3) due to high cooling capacity (refer Figure 4) at same ambient temperature. This happened possible because the improved controller PCB frequency was not reduced by control circuit at high ambient conditions as compared to the conventional air conditioner (refer Figure 5), due to IGBT temperature was lower (refer Figure 6) in the improved inverter air conditioner as compared to the conventional air conditioner. IGBT and Filter capacitor temperatures are low (Refer Figures 6 and 7) in improved inverter air conditioner as compared to the conventional air conditioner.

Additionally, cost of the improved inverter air conditioner having improved controller PCB is reduced by reducing heat sink size and filter capacitor temperature specification. Thus, the present invention provides a compact, effective, durable, economical and efficient improved inverter air conditioner with improved controller PCB which is not placed in the outdoor unit and may be either placed inside the indoor unit of air conditioner or anywhere inside the room.
The accompanying drawings are illustrative of particular examples for enabling methods of the present invention, are descriptive of some of the methods, and are not intended to limit the scope of the invention. The drawings are not to scale (unless so stated) and are intended for use in conjunction with the explanations in the following detailed description.

The figures and the description above provide details of one particular design which is also specific to the design and configuration of the improved air conditioner with improved controller PCB being considered. It would be obvious to person skilled in the art that, based on the concepts, ideas and issues described herein, several variations of the proposed design for the design and configuration of the base engine considered, as well as, for engines with distinctly different design and configuration, will be possible without deviating from the scope of this invention.

Although the embodiments herein are described with various specific embodiments, it will be obvious for a person skilled in the art to practice the embodiments herein with modifications. However, all such modifications are deemed to be within the scope of the invention. It is also to be understood that the description is intended to cover all of the generic and specific features of the embodiments described herein and all the statements of the scope of the embodiments which as a matter of language might be said to fall there between.

We claim:
1. An economical and compact inverter air conditioner system to work at optimum and/or adverse conditions, the economical inverter air conditioner system comprising:
an outdoor unit; and
an indoor unit including
indoor and outdoor control unit wherein controller PCB is placed inside the room and power factor correction is regulated.

2. The economical inverter air conditioner system to work at optimum and/or adverse conditions as claimed in claim 1, wherein the controller PCB is placed inside the room as an external frame or as separate unit.

3. The economical inverter air conditioner system to work at optimum and/or adverse conditions as claimed in claim 1, wherein the controller PCB is placed in the indoor unit.

4. The economical inverter air conditioner system to work at optimum and/or adverse conditions as claimed in claim 1, wherein the controller PCB is placed in the indoor unit without obstruction to the circuit of indoor unit.

5. An improved controller PCB to provide more efficient and economical inverter air conditioner wherein working parameters of the inverter air conditioner have been changed to work at optimum and/or adverse conditions.

6. The improved controller PCB as claimed in claim 6, wherein the improved controller PCB is placed in the indoor unit.

7. The improved controller PCB as claimed in claim 6, wherein the improved controller PCB is placed in the indoor unit without obstruction to the circuit of indoor unit.

8. The improved controller PCB as claimed in claim 6, wherein the improved controller PCB is placed inside the room as an external frame or as separate unit.