FIELD OF INVENTION
The invention relates to a colossal DSP sinewave inverter (single phase-single phase) with RS-232. mobile interface and GSM connectivity.
RELATED ART
A conventional single-phase inverter is known to have been provided so as to transform DC power to single-phase AC power to drive a load. The single-phase AC inverter consists of insulated gate bipolar transistors (IGBTs). The gates of the IGBT are controlled by PWM control signals generated by the DSP.
However, the inverter described above is associated with some technical problems, such as malfunctioning, low efficiency and capacity, details of which are elaborated as follows:
The power loss of the general inverter can be classified as conduction loss and switching loss (including turn-on and turn-off losses). In general, a higher switching frequency of the IGBT has a more desirable output waveform, but the power loss is also greater and the overall efficiency is lower. For an inverter of a greater capacity, maintenance of a high switching frequency to achieve a desired waveform output is difficult.
In term of capacity, the safety current of the IGBT must be reduced as the switching frequency increases. Moreover, the dividing current is not equal when the IGBTs are coupled in parallel. Hence the total safety current has to be reduced.
Pulse width modulator (PWM) inverters are used in single phase bridges, H-bridges, and half-bridge configurations. The bus capacitors, typically electrolytic, consist of two or more capacitors connected in series or parallel, are fed from a rectifier or actively switched front end section.
The existing inverters are not user configurable conveniently upon charging the battery, the charging & other settings are also required to be changed which need hardware & software changes. Keeping a track of these is quite difficult for the manufacturer & also cumbersome.
Some of the available inverters do not have monitoring & controlling software interface. The problem faced by using these inverters is that when the battery goes low, it abruptly shuts down the inverter connected to it. This results in the loss of data & system failure.
Some of inverters which claim to have monitoring & controlling software have the following draw backs-fa) Existing monitoring & controlling software interface is not real time. They do not provide instantaneous values of the various parameters of the inverter and cannot do power audit. The product up-gradation is also not possible by these softwares, (b) In the inverters, where remote monitoring and controlling is possible, an additional card or hardware (SNMP and other like that) is required to be connected to the inverter system. This increases the hardware as well as cost of the inverter.
In order to reduce the aforementioned problems, attempts have been made to produce an improved dispensing power backup system. U. S. publication no. 20040085785 referring to an
uninterruptible power supply system limits an inrush current. U. S. patent no. 7.180,763 "Power converter" and patent no. CN1815876 "Inverter for digital generator group" having the switching circuit and the control circuit are incorporated as prior art. The prior art power backup systems have general short-comings and do not adequately address the aforementioned problems.
OBJECTS OF THE INVENTION
The primary object of the invention is to propose a single phase inverter and particularly single-phase inverter for heavy duty applications, which is very efficient and low cost, for use in heavy duty application varying the connected load having high inrush current drawing needs or other very cost sensitive applications. Power generation is through DSPs using PWM technique and the entire inverter function is controlled by the DSP being used in the inverter.
Another object of the invention is to propose a single phase inverter and particularly single-phase inverter for heavy duty applications, further utilizing the same lGBT's used for power generation, to act as a charger when the mains is available and for charging the battery bank connected thereby reducing the charger circuitry & cost.
Further object of the invention is to propose a single phase inverter and particularly single-phase inverter for heavy duty applications for generating the regulated AC output from the DC source when the grid power is not available and a DSP control section connected to the inverter section for pulse width modulating the inverter, wherein the control section has a voltage loop and a current loop for the AC output, and wherein the control section has a means of processing.
Still another object of the invention is to propose a single phase inverter and particularly single-phase inverter for heavy duty applications comprising of IGBTs to provide AC wherein the regulated AC output is single-phase.
Yet another object of the invention is to propose a single phase inverter and particularly single-phase inverter for heavy duty applications, further comprising a digital signal processor (DSP) controlling the entire inverter function.
Another object of the invention is to propose a single phase inverter and particularly single-phase inverter for heavy duty applications comprising of a driver section to drive the inverter IGBTs wherein the driver is controlled by DSP.
Further object of the invention is to propose a single phase inverter and particularly single-phase inverter for heavy duty applications, comprising of a solid state relay for fast changeover from mains to inverter & vice versa allowing the computer operation on the product. This also helps in preventing the switching off of DVD players. TV during changeover.
Still another object of the invention is to propose a single phase inverter and particularly single-phase inverter for heavy duty applications in which a TDR (Time Delay Relay) being provided in the inverter system for operating the air conditioner or any heavy load after a time delay. The dela\ time is configurable by software or mobile phone from 30sec to l0minutes.
Yet another further object of the invention is to propose a single phase inverter and particularly single-phase inverter for heavy duty applications wherein a DC/DC converter system supplies DC power supply to different sections and drivers.
Yct another further object of the invention is to propose a single phase inverter and particularly single-phase inverter for heavy duty applications which can be connected to mobile or landline phone so as to configure its various parameters like output voltage, frequency, mains input w indow range, battery low level, charging current and load etc.
Still another further object of the invention is to propose a single phase inverter and particularly single-phase inverter for heavy duty applications which has the connectivity through GSM device. It provides connectivity of the inverter to the internet without a computer to monitor & control the product from a remote location using mobile phone.
SUMMARY OF THE INVENTION
The present invention has been made in consideration of the aforementioned background. It is therefore an object of the present invention to provide an improved single phase power inverter and control method so as to facilitate high quality and low output total harmonic distortion operation of single phase power inverters, particularly when applied to non-linear, high harmonic content, and/or overloads, common in modern power distribution systems, both commercial and industrial. Although isolated gate bipolar transistor (IGBT) power switches are the preferred embodiment in high voltage inverter applications, other power switches used in the lower voltage applications (FET's for example) are also applicable to the invention.
The present invention comprising of control printed circuit board (PCB) having a digital signal processor (DSP) based digital PWM AC voltage and current regulator, with voltage and current control loops. Independent voltage loop controls the line to neutral voltage of output. In one embodiment voltage feedback is provided by sensing feedback transformer & resistance and integrator capacitor to boost DC gain and thereby enhancing DC offset voltage rejection. Independent current loop controls the output phase current. Current feedback is also provided by resistor and filter capacitor circuits for optimum inverter system tuning. Both the voltage and the current loops have digitally selected proportional and integral terms, and the feedback circuits have analog phase lead. Thus, precise closed loop transient performance is accomplished.
Due to DSP controlled battery charging, the present invention helps in a prolonged life of the battery bank as well as provides a longer backup from the inverter.
The present invention also has additional generator start facility by forwarding command to generator through DSP to optimize the use of generator available.
The present invention diagnoses the problem in the inverter e.g. the status of the battery, battery life, overload, short circuit etc.
Present invention also provides real time management using internet for an inverter connected to computer. As the same DSP, used to control the inverter communicates with the computer based software, the real time parameters are transferred to the computer. This is through the dedicated communication protocol that is implemented inside the DSP and also in the monitoring software. The DSP technology provides faster and precise control of inverter system for effective and safe mechanism. Through the DSP the product up-gradation is also possible as the commands are
directly sent to the DSP. This web based facility is without any additional hardware thus reducing the hardware and also the cost of the inverter. The inverter control section is connected to the computer via any serial port communication cable or the USB cable or RJ45 cable. The inverter installed anywhere in the world can be centrally monitored and controlled by the user. The present invention also provides facility to monitor & control the inverter via mobile and remote.
The foregoing, as well as additional objects, features and advantages of the invention will be more readily apparent from the following detailed description, which proceeds with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Further objects and advantages of this invention will be more apparent from the ensuing description when read in conjunction with the accompanying drawings and wherein:
FIG. 1 shows a block diagram of the single phase inverter of the invention;
FIG. 2 shows the circuit diagram of inverter 1GBT section;
FIG. 3 shows the circuit diagram of the DSP control card-master:
FIG. 4 shows the circuit diagram of the DSP control card-slave:
FIG. 5 shows the circuit diagram of driver card;
FIG. 6 shows the circuit diagram of the DC/DC converter circuit;
FIG.7 shows the circuit diagram of RS-232 cable connection;
FIG.8 shows circuit diagram of RS-232 interface with DSP;
FIG.9 shows the circuit diagram of the LCD interface with DSP;
FIG. 10 shows a pictorial diagram of GSM connectivity to the inverter;
FIG.11 shows a pictorial diagram of power management system controlled by web monitoring software using computer system;
FIG.12 shows a pictorial diagram of power management system controlled by web monitoring software using mobile or remote;
FIG. 13 shows the flow of the software program pertaining to the operation of the invention for monitoring purpose of the inverter;
FIG. 14 shows the flow of the software program pertaining to the operation of the invention for controlling the various parameters of the inverter;
DETAILED DESCRIPTION OF THE INVENTION WITH REFERENCE TO THE ACCOMPANYING DRAWINGS:-
Reference may be made to FIG. 1 showing a block diagrammatic overview of one of the single phase power inverter and control method, for use in AC distributed power systems, typically in pulse width modulation (PWM), inverter power generation and/or conditioning applications.
The single phase inverter of the present invention is designed using DSP with PWM technique and with 1GBT as power devices. These are single Phase input & single Phase out inverters. These are designed for heavy-duty industrial application e.g. Air conditioners, heavy machinery, deep freezers, motor loads etc.
The single phase inverter of the present invention is designed using DSP with PWM technique and with IGBT as power devices. The DSP control card containing the Master DSP & Slave DSP is the central Processing Unit controlling the entire inverter function. There are other cards also like driver cards. DC-DC conversion card which work with the DSP card to realize the entire inverter function. The DC-DC conversion card takes the battery voltage as input & produces +5V & +15V supplies needed in the system. The DSP card senses the mains input, Inverter output. Output current, charging current when mains is available and battery voltage.
When the mains is available, the DSP card instructs the relay to bypass the mains & also to charge the battery. The battery voltage & current limits are maintained as per the embedded software in the DSP.
When the mains fail or go beyond the programmed low & high limits the DSP card instructs the relay to changeover & also produce the PWM signal to generate the output power from the inverter. The inverter IGBT modules receive the DC power and provide regulated AC power at the output. Control of the circuit is achieved by controlling the IGBTs by pulse width modulated (PWM) signals generated by the inverter DSP controller, via the isolated gate driver circuits. IGBT driver cards provide protection & increase current capability of PWM signals. The IGBT driver cards receive input signals from inverter control circuit (DSP) and provide output drive signals to the inverter module IGBT. The two complementary PWM signals generated by the DSP cannot be high simultaneously. Thus this is controlled by the logic gates. IGBT driver card provides isolation between DSP side and IGBT side with the help of opto-couplers. If there is any short circuit or voltage drop in the IGBT side and VCE becomes greater than the specified value, then the driver takes protection by isolating the DSP and IGBT side. Since DSP does not have the sufficient current to drive the inverter, IGBT driver card increases the current capability of DSP.
The isolation transformer is used to increase or decrease the voltage of the AC power from the inverter power module IGBT and to provide isolation between a load and the inverter. The isolation transformer is typically inverter dependant, the capacity of which is typically dependent on inverter output power specifications. The isolation transformer provides galvanic isolation to the load connected.
The transformer output is filtered and is then available as a regulated single phase, three wire AC power output.
Current feedback as well as voltage feedback is taken from the transformer output. The current feedback is connected directly to the inverter DSP for A/D conversion. The voltage feedback signal is connected to the DSP via resistor divider and filter capacitor signal conditioning circuits.
After conversion, the voltage feedback terms are summed with the voltage set point commands, resulting in voltage error signals. The voltage error signals are multiplied by the voltage proportional and integral terms. The resulting output is compared to the current limit term, clamped if required and then sent to the current loop.
Current feedback is taken from the inverter output phase current sensor, scaled and filtered, and the resulting current feedback signal is fed to the DSP A/D converter.
After the mains failure the TDR provided in the inverter operates the air conditioner or any heavy load after a time delay. The delay time is configurable by software or a mobile phone from 30sec to 10 minutes.
Referring to FIG. 2, inverter module of the present invention includes single/multiple of IGBT's and capacitors depending on the capacity of the inverter. This type of circuit provides enhanced inrush current withstand capability. Module can support the modulation frequency of the inverter, reduce the switching loss and improve the inverter efficiency with minimum noise, leading to the inverter's improved performance and cost reduction. The inverter IGBT modules receive the DC power and provide regulated AC power at the power output. Control of the circuit is achieved by controlling the IGBTs by pulse width modulated (PWM) signals generated by the inverter DSP controller, via the isolated gate driver circuits.
The same IGBTs are being used as a charger when the mains is available, for charging the battery bank connected thereto, hence reducing the charger circuitry & cost.
FIG. 3 and Fig. 4 shows the circuit diagram of the DSP control card-master and of the DSP control card-slave. The DSP carries out the entire inverter function. The DSP control card senses the input voltage, output voltage, output current and battery voltage and gets ambient temperature feedbacks. It generates PWM. The output PWM signal is transmitted to the output inverter power switches via gate driver circuits.
Referring to FIG. 5, the inverter also comprises IGBT driver cards circuit that provides protection & increases current capability of PWM signals. The IGBT driver cards receive input signals from inverter control circuit (DSP) and provide output drive signals to the inverter module IGBT. The two complementary PWM signals generated by the DSP cannot be high simultaneously. Thus this is controlled by the logic gates. IGBT driver card provides isolation between DSP side and IGBT side with the help of opto-couplers. If there is any short circuit or voltage drop in the IGBT side and VCE becomes greater than the specified value, then the driver takes protection by isolating the DSP side and IGBT side. Since DSP does not have the sufficient current to drive the inverter, IGBT driver card increases the current capability of DSP.
Referring to FIG. 7 and 8, the DSP control card also connects to any serial communication port (say RS232) to monitor the inverter status on local or remote location. According to Fig. 9. this card also provides data to be displayed on the graphic display such as LCD. The processor is
configured to perform its various functions by reading and executing computer-readable, computer-executable software instructions stored in the memory. The master can further receive commands/instructions from the computer via the network and the slave and control portions of the inverter to implement the commands.
FIG. 6 shows the circuit diagram of the DC/DC converter circuit. The SMPS power supply cards take batten voltage as input & provide isolated +5V & +15V supplies, which are used by DSP cards & IGBT driver cards to drive the inverter IGBTs. IGBTs provide faster speeds, better drive and output characteristics than power BJTs and offer higher current densities than equivalent high-powered MOSFETs.
TDR provided in the inverter operates the air conditioner or any heavy load after a time delay. The delay time is configurable by software or mobile phone from 30sec to l0minutes.
Potential free contacts are provided with intelligent DSP control for generator start, battery low protection, mains/ on battery status and inverter protection.
The isolation transformer is used to increase or decrease the voltage of the AC power from the inverter power module IGBT and to provide isolation between a load and the inverter. The isolation transformer is typically inverter dependant, the capacity of which is typically dependent on inverter output power specifications. The isolation transformer provides galvanic isolation to the load connected.
The transformer output is filtered and is then available as a regulated single phase and three wire AC power output.
Current feedback as well as voltage feedback is taken from the transformer output. The current feedback is connected directly to the inverter DSP for A/ D conversion. The voltage feedback signal is connected to the DSP via resistor divider and filter capacitor signal conditioning circuits.
After conversion, the voltage feedback terms are summed with the voltage set point commands, resulting in voltage error signals. The voltage error signals are multiplied by the voltage proportional and integral terms. The resulting output is compared to the current limit term, clamped if required and then sent to the current loop.
Current feedback is taken from the inverter output phase current sensor, scaled and filtered, and the resulting current feedback signal is fed to the DSP A-D converter.
There are numerous variables (such as PWM filter circuit, DC link voltage, desired output impedance and PWM carrier frequency) that will impact feedback compensation, and gain selections. However, there are certain guidelines that provide a general method of approximation for selecting critical components and gain terms for a variety of PWM inverter applications.
Further, according to the present invention, mobile or a landline phone can be connected to the inverter to configure its various parameters like output voltage, frequency, mains input window range, battery low level, charging current and load etc. The company dials the user's phone number connected to the inverter and updates the inverter as per the user's need. This is a very
useful feature as this makes the product completely configurable as per the user's need without adding/replacing any extra hardware/software. The user using his mobile phone can also configure these parameters.
The other basic constituents of the inverter are solid state relay, current transformer, power transformer, fan and temperature sensor.
Current transformers are used to measure the input & output current & control the inverter function depending on the current. It provides signal to the DSP card to cater to overload conditions.
The output generated by these inverters are pure sine wave with regulated voltage & frequency i.e. voltage regulation within 1% & frequency regulation within 0.1%.
The switchover time from mains to inverter is <= 5mSec & from inverter to mains <= 2mSec. Hence, computer can also run on the product.
These inverters have very high inrush bearing capability as compared to generators e.g. 200% for 5 Sec & 300% for 2 sec. These inverters can be run at 100%) load continuously whereas generators are to be run at 80% load only. Hence for the same load requirement, a smaller capacity of inverter is required than a generator.
Fan operation is a novel feature of the invention as it operates only when it is required. It is controlled using a temperature sensor mounted on the heat sink. It operates only when the temperature of heat sink reaches 55°C and switches off when temperature comes down to 45°deg C. Hence the life of fan is enhanced and also its power saving. The fan is so located that it takes fresh cold air from sides and flushes the air through the heat sink. Hence cooling to the maximum is possible in the shortest possible time.
The present invention also has a front panel display comprising of such as 16x2 lines LCD to indicate the status of input mains and output voltage (Fig.9). It also displays the loads using a bar graph with overload indications too. It also displays the battery level using bar graph, battery voltage; short-circuit condition, output low/high condition.
Referring to Fig. 10, in the present invention, the inverter also has the connectivity through GSM device. It provides connectivity of the inverter to the internet without a computer. Using this, the user can monitor & control the product from a remote location with the help of mobile phone. This feature is very useful at those remote locations where the user does not have a computer and wants to check the status of the inverter. It is also advantageous to monitor the inverter in households where computer is not available. Additional advantage of this facility is that it reduces the cost of the inverter and does not require additional telephone lines. The data is recorded locally by the monitoring system and relayed to the server via the GSM network. Using the password, user can retrieve his unit's data at any time with the help of any internet access anywhere in the world. Fig.l shows the connectivity of the GSM device with the inverter. GSM device is connected to the inverter via DSP through the RS232/ RJ45/ USB cable and through GPRS connectivity, data is transmitted to the remote locations.
The inverter data is processed in a central database. User can access the data records at any time using protected internet access. The important parameters of the inverter like input voltage, input frequency, output voltage, frequency, power, current, battery voltage, battery level, number of power cuts & their duration can be monitored on the mobile phone. It is also possible to switch

ON/ OFF the inverter from a remote location. Also the output voltage, battery low level and load can be changed from a remote location. Under various alarm conditions the system sends SMS to the predefined numbers so that corrective action can be taken. This is a very useful feature which allows the remote monitoring & control of the product.
Present invention also provides an additional option for real time web based remote monitoring as well as multiple user local monitoring for inverter using computer with the help of Power Management Software using internet as shown in the Fig. 11 & 12.
Power Management Software includes:
1. Web based monitoring Application.
2. Local Monitoring Application.
With the help of the web based monitoring software, the inverter installed anywhere in the world can be centrally monitored and controlled by the user. It supports all operating systems such as Windows version & various Linux and Solaris versions. A licensed copy of the software is installed and run on the computer connected to the power system via any communication cable (say RS-232/ USB / RJ-45) through which it starts receiving data. The unique and fully validated software solution allows various parameters of the inverter to check and the inverter can be upgraded, including load and status of each inverter. The novel feature of the software is that it does not require any additional hardware like SNMP card for web monitoring. Even local monitoring is done by using TCP/ IP. Use of a computer instead of SNMP provides two way communication and product up-gradation possibility which was not possible by using SNMP hardware as seen in the existing monitoring software. The Power Management Software not only controls the start/shutdown of the inverter but also provides control for various parameters in the inverter and the inverter up-gradation. The software is very useful for unmanned locations or mission critical application where power backup systems are installed and where their assured availability is essential and mission critical. Some of the examples are ATMs, telecom towers; satellite based systems, online process control equipments, fully networked chain of retail stores, chain of multiplexes, their supply chain systems. Such inherent flexibility lends itself for conditions based operational utilization of power backup systems thus adding considerable value and enhancing the maintainability and assured availability of these systems.
Local power monitoring software requires a serial connection between a computer & the inverter via serial port communication cable. Inverter control section connected to the computer via any communication cable (say RS232) is shown in Fig. 11. Fig. 12 shows that the web monitoring software provides status of the inverter on the mobile also.
The web monitoring software facilitates checking of various parameters in the form of digital and graphical representation. Data logging of these parameters can be ensured at defined time intervals say every 10 or 15 seconds. The flow chart in Fig 13 & 14 presents the functioning of the software for monitoring and controlling the inverter.
Chief components of the Power Management Software
The Power Management Software comprises of the following two components (A) Local Server application
(B) Local Client Application
(A) Local Server application performs communication with the inverter, its shutdown as well as that of the local clients, emailing and broadcasting of inverter events
Interpreting Main Panel
The main panel display provides node information and information on the status of the power, inverter battery system, inverter operations, and communications. The display automatically detects the configuration of the inverter and adjusts itself accordingly.
The main panel is a graphical representation of the operational status of the inverter. Input and output voltage, input and output frequencies are shown with the help of analog meters. Battery voltage and load % along with output current, output power and inverter capacity are indicated \\ ith the help of bar graphs.
It provides detailed information regarding the present power situation and controls features such as orderly inverter shutdown and configuring alerts. It also provides inverter shutdown time, review of the power event and battery management logs and handling other tasks.
Following are the utilities provided by the software and local server which can configure the inverter accordingly
1. Data view
Data view uses bar graphs and text to show the power situation. The display is divided into sections as follows:
Output
Output information shows the actual output load on the inverter. The output section includes the
following:
• Status: Condition of the inverter battery
• % Load: Percentage of the inverter's calculated full load in use including overload conditions
• Volts: Output voltage for the load including over voltage and under voltage conditions
• Hz: Output frequency for the load including high and low frequency conditions
Input
The input section is a green, yellow and red bar on a row below the output section showing the utility power source voltage and limits. The colors on the display indicate whether the power is within acceptable limits. If the voltage reading is in the green range it shows that the inverter is operating on the utility power. Yellow or red range indicates that the work is to be saved.
2. Battery Status and Load
Battery Status information provides description of the status of the battery. Load feature gives the present load on inverter.
3. Secure Access
The Software provides secure access for a valid user to make changes in the Power Management Software Application.
4. Email Notification
User can configure Power Management software to send an email message to upto 4 people when an event occurs.
5. Data Log
Data Log provides the log of inverter parameters input and output voltage, input and output frequency, power, inverter status, output current, battery capacity, load and capacity at specified time interval.
6. Inverter Settings
Power Management Software provides the way to set some inverter settings like
• Output voltage/ output frequency as per requirement.
• Change in Battery low/ battery high protection.
• Disable/Enable of Buzzer.
• Change in Mains High/ Low cut level.
• Inverter Shutdown/ Restart.
• TDR (Time delay Relay) time setting.
• TDR enable / disable.
• Load configuration
• Battery charging current
7. Broadcasting Messages
User can configure Power Management Software to broadcast a notification message when an event occurs in the following way-
8. Customize Alerts
It can be used to change the text of an alert message or to change the response that system makes to alert.
9. Delay Times
User can change the delay time for message for e.g. 10, 20, 30, 40, 50 or 60 sec.
10. Client Connection
This option disables/ enables Client-Server communication.
11. Update User Information
Under this option user can update his/her personal information like name, company name, address, phone number etc.
12. Priority based Settings
Attached equipments to the inverter may be given two levels of priority - Low and High. Time entered against this setting defines the time for low priority equipment to shutdown. The value for high priority equipment is double of this time.
13. Inverter Scheduler Settings
'Weekly shutdown schedule' can be used to shut down all or segments of the inverter load at a certain time each day. Periods when the inverter is scheduled to be ON are shown in orange. Periods when the inverter is scheduled to be off are shown in white.
14. Server Shutdown Settings
It sets the interval between the time the Power Management Application software begins to shut down of the Windows environment and the power from the inverter shuts off.
15. View Data Logged File
User can view the Logged file at any time. Data which is logged is as follows: Date Time
Input and Output Voltage Input and Output Frequency Output Current Output Power Load percentage Total Units Ambient Temperature Capacity Batter\ Voltage Status
16. Connected Users List
Server lists the client's status, whether they are online or offline, client's name, priority and their IP addresses. Connected users show the number of clients online.
17. View Graphs
User can view 3 kinds of graphs
• Input & output voltage
• Input & output frequency
• Output power
• Battery Voltage
This utility provides following features-
• Auto and Manual saving of graph
• Plotting of input and output voltage, input and output frequency and output power
• Maximum and minimum value over a period of time
• Plotting of data from files
• Start and End Time at which user had actually started/ ended the plotting in graph
• Printing of the graph
(B) Local client application registers and communicates with the local server.
Interpreting Main Panel
The main panel displays node information and information on the status of the power, inverter battery system, inverter operations and communications.
The main panel is a graphical representation of the operational status of the inverter. Input and output voltage and frequency are shown with the help of analog meters. Battery voltage and load % are indicated with the help of bar graphs, besides output current, output power and inverter capacity.
It provides detailed information regarding the present power situation. It also provides inverter shutdown time, review of the power event and battery management logs.
Following are the utilities provided by the software and the local client can configure the inverter accordingly.
1. Data view
Data view uses bar graphs and text to show the power situation. The display is divided into sections as follows:
Output
Output information shows the actual output load on the inverter. The Output section includes the following:
• Status: Condition of the inverter battery
• % Load: Percentage of the inverter's calculated full load in use including overload conditions
• Volts: Output voltage for the load including over voltage and under voltage conditions
• Hz: Output frequency for the load including high and low frequency conditions
Input
The input section is a green, yellow and red bar on a row below the output section showing the utility power source voltage and limits. The colors on the display indicate whether the power is within acceptable limits. If the voltage reading is in the green range it shows that the inverter is operating on the utility power. Yellow or red range indicates that the work is to be saved.
2. Battery Status and Load
Battery status information provides description of the status of the battery. Load feature gives the present load on inverter.
3. Update Server IP
Client has the permission to change the Server IP address. Connection gets closed as soon as user would chanue Server IP.
4. Update Priority
Client has, by default, priority 'Low'. Client can change his priority. Clients are allowed to change their priority from 'Low' to 'High' and vice versa.
5. Update User Name and Password
Client can change user name and password.
Now if the user has to monitor/ control the inverter system remotely he has to go through web monitoring. The web monitoring application includes -
1. Power Management Software, which reads data from the DSP of inverter through RS-232/RJ45/USB port.
2. Similarly live data of 'NT number of inverter data are available on Server in every 3 to 10 seconds.
3. A valid user has to login on a specific website which will display list of all inverter.
4. "Details'* link displays the live status and parameters of the product.
5. One can view the data log of product date & time accordingly.
6. One can also view the summary of the product since installed. The summary contains blackouts, brownouts, number of units drawn by load through inverter, review of grid power in terms of fluctuations and number of outages.
7. Blackouts contains each and every moment when mains are not present.
8. Brownout contains duration of inverter mode when there is low voltage.
9. Other details can be viewed like:
• Input Voltage duration:
1. <180V
2. > 180V &< = 200V
3. > 200V &<-230V
4. > 230V &< = 250V
5. > 250V &< = 270V
6. >270V
• Input Frequency duration:
1. < = 49.8 Hz
2. < = 49.5 Hz
3. < = 48 Hz
4. > = 50.2 Hz
5. > = 50.5 Hz
• Output Power / Load duration:
1. < = 25%
2. 26%-50%
3. 51%-75%
4. 76%- 100%
5. >= 101%
• Duration of Status i.e. duration of on mains/ on battery/ overload
conditions etc.
10. Charts of input voltage vs time, input frequency vs time, output voltage vs time, output frequency vs time, battery voltage vs time, output power vs time, load vs time and blackouts vs date are available for analysis.
11. One can send request code of particular product to retrieve live status of product immediately.

12. Controlling can be done through web and mobile to-Set Output Voltage/ Output Frequency as per requirement. Change Battery Low/ Battery High protection. Disable/ Enable buzzer. Change Mains High/ Low cut level. Inverter Shutdown/ Restart. TDR time delay setting. TDR enable / disable Load configuration Battery charging current
13. Local computers can also be controlled/ scheduled for shutdown by using TCP/ IP.
It is to be noted that the present invention is susceptible to modifications, adaptations and changes by those skilled in the art. Such variant embodiments employing the concepts and features of this invention are intended to be within the scope of the present invention, which is further set forth under the following claims:-

WE CLAIM:
1. A colossal DSP sinewave inverter (single phase-single phase) with RS-232, mobile interface and GSM connectivity comprising of DC-DC conversion card and driver cards working with DSP card for functioning of the inverter; IGBT power device connected to the driver section, wherein the IGBT driver cards receives input signals from the inverter control circuit (DSP) and provide output drive signals to the inverter IGBT modules, and an isolation transformer.
2. A colossal DSP sinewave inverter as claimed in claim 1 wherein the isolation transformer is used to change the voltage of the AC power from the inverter power IGBT modules and to provide isolation between a load and the inverter.
3. A colossal DSP sinewave inverter as claimed in claim 2 wherein the isolation transformer provides galvanic isolation to the load connected and the DSP control card comprising of master DSP and slave DSP constituting the central processing unit controlling the inverter.
4. A colossal DSP sinewave inverter as claimed in any of the preceding claims comprising of a filter section for filtering output of the transformer and generating single phase and three wire AC power output.
5. A colossal DSP sinewave inverter as claimed in any of the preceding claims wherein the inverter module includes single/multiple of IGBT's and capacitors depending on the capacity of the inverter such as herein described.
6. A colossal DSP sinewave inverter as claimed in any of the preceding claims comprising of a mobile or landline phone connected to the inverter so as to configure its various parameters such as herein described wherein the inverter comprising of solid state relay, current transformer, power transformer fan and temperature sensor.
7. A colossal DSP sinewave inverter as claimed in claim 6 wherein operation of the fan is controlled using a temperature sensor mounted on heat sink.
8. A colossal DSP sinewave inverter as claimed in any of the preceding claims comprising of a display such as LCD to indicate such as the status of input mains and output voltage.
9. A colossal DSP sinewave inverter as claimed in any of the preceding claims wherein the inverter is connected to GSM modem.
10. A colossal DSP sinewave inverter (single phase- single phase) with RS-232, mobile interface and GSM connectivity substantially as herein described with reference to the accompanying drawings.