1
FORM 2 5
THE PATENTS ACT 1970
[39 OF 1970]
&
THE PATENTS RULES, 2003 10
COMPLETE SPECIFICATION
[See section 10; Rule 13]
15
TITLE: SYSTEM FOR OPERATING DC-DC CONVERTER
20
Name and Address of the Applicant:
Applicant Name: SPARK MINDA GREEN MOBILITY SYSTEM PRIVATE LIMITED
Address: E-5/2, Chakan Industrial Area, Phase - III, M.I.D.C, Nanekarwadi, Tal - Khed, Pune 410501, Maharashtra India 25
Nationality: Indian
30
The following specification particularly describes the invention and the manner in which it is to be performed.
35
2
TECHNICAL FIELD 5
[001]
The present invention to related to a system for operating DC-DC converter by providing optimal operating conditions.
BACKGROUND
[002]
The following description includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or 10 relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.
[003]
A DC-DC converter are widely used in various application to covert direct current (DC) from one voltage level to another voltage level. Depending upon the requirements and application, the DC-DC converter may be utilized in different applications including charging stations for electric 15 vehicles, battery energy storage systems, solar, DC energy distribution systems, traction systems and/or the like. In case of automobiles, the DC-DC converter is used to convert the high DC voltage to lower DC voltage, which are then used to power auxiliary systems such as headlights, actuators, wiper control, vehicle access units, window motors, and the like.
[004]
A major challenge in the operation of DC-DC converters is the occurrence of inrush 20 current. Inrush current refers to the initial surge of electrical current that occurs when a vehicle is powered on.
[005]
This issue arises because an electronic control unit does not allocate a dedicated pin to enable the DC-DC converter by connecting it to the EN pin of the DC-DC converter. As a result, the converter experiences a sudden surge of inrush current during startup of the vehicle, which can cause 25 the input voltage to drop significantly. This surge in current, drawn directly from the battery, may
3
cause the converter to enter a reset mode or rapidly drain the battery voltage. Consequently, the vehicle
5 may fail to start altogether due to insufficient input current.
[006]
Traditional methods for managing inrush current typically require an external enable signal from the vehicle electronic control unit (ECU) to initiate the operation of the DC-DC converter. This requirement introduces further complications, such as increased pin counts in connectors and additional programming overhead, making the integration process less adaptable to vehicle 10 architectures.
SUMMARY
[007]
The present disclosure overcomes one or more shortcomings of the prior art and provides additional advantages discussed throughout the present disclosure. Additional features and advantages 15 are realized through the techniques of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered a part of the claimed disclosure.
[008]
In an aspect, the present disclosure recites a system for operating a DC-DC converter. The system comprises an activation circuit configured to connect with a supply unit to receive supply voltage and a transistor circuitry. The transistor circuitry configured to connect with the supply unit 20 to receive the supply voltage and configured to control the activation circuit for operating the DC-DC converter based on the supply voltage. To operate the DC-DC converter, the transistor circuitry is configured to operate in one of an on state and off state based on the supply voltage and control the activation circuit to generate fixed delay voltage signal based on the operating state of the transistor circuitry to provide the fixed delay voltage signal to the DC-DC converter. The fixed delay voltage 25 signal is generated based on the supply voltage.
4
[001]
The foregoing summary is illustrative only and is not intended to be in any way limiting. 5 In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.
BRIEF DESCRIPTION OF DRAWINGS
[002]
The embodiments of the disclosure itself, as well as a preferred mode of use, further 10 objectives and advantages thereof, will best be understood by reference to the following detailed description of an illustrative embodiment when read in conjunction with the accompanying drawings. One or more embodiments are now described, by way of example only, with reference to the accompanying drawings in which:
[003]
FIG. 1 illustrates an environment architecture 100 for implementing a system for 15 operating DC-DC converter in a vehicle, in accordance with an embodiment of the present disclosure.
[004]
FIG.2 illustrates an equivalent circuit representation of a system 200, in accordance with an embodiment of the present disclosure.
[005]
FIG.3 illustrates the equivalent circuit representation of the system during high supply voltage from the supply unit, in accordance with an embodiment of the present disclosure. 20
[006]
FIG. 4 illustrates equivalent circuit representation of the system during low supply voltage from the supply unit, in accordance with another embodiment of the present disclosure.
[007]
The figures depict embodiments of the disclosure for purposes of illustration only. One skilled in the art will readily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the 25 principles of the disclosure described herein.
DETAILED DESCRIPTION
5
[008]
The foregoing has broadly outlined the features and technical advantages of the present 5 disclosure in order that the detailed description of the disclosure that follows may be better understood. It should be appreciated by those skilled in the art that the conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure.
[009]
Various embodiments of the present invention will now be described more fully 10 hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. Indeed, the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements.
[0010]
The term “or” is used herein in both the alternative and conjunctive sense, unless otherwise 15 indicated.
[0011]
The terms “illustrative,” “example,” and “exemplary” are used to be examples with no indication of quality level. Like numbers refer to like elements throughout.
[0012]
The phrases “in an embodiment,” “in one embodiment,” “according to one embodiment,” and the like generally mean that the particular feature, structure, or characteristic following the phrase 20 may be included in at least one embodiment of the present disclosure and may be included in more than one embodiment of the present disclosure (importantly, such phrases do not necessarily refer to the same embodiment).
[0013]
The word “exemplary” is used herein to mean “serving as an example, instance, or illustration.” Any implementation described herein as “exemplary” is not necessarily to be construed 25 as preferred or advantageous over other implementations.
6
[0014]
If the specification states a component or feature “can,” “may,” “could,” “should,” 5 “would,” “preferably,” “possibly,” “typically,” “optionally,” “for example,” “often,” or “might” (or other such language) be included or have a characteristic, that particular component or feature is not required to be included or to have the characteristic. Such component or feature may be optionally included in some embodiments, or it may be excluded.
[0015]
The phrase “vehicle” or “electric vehicle” or “hybrid vehicle” are used interchangeably 10 throughout the disclosure. The vehicle may be a car, truck, semi-truck, motorcycle, plane, train, moped, scooter, 2-wheeler, 4-wheeler, 5-wheeler or other type of transportation.
[0016]
Turning now to the drawings, the detailed description set forth below in connection with the appended drawings is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. The 15 detailed description includes specific details for the purpose of providing a thorough understanding of various concepts with like numerals denote like components throughout the several views and operating path of current in different operable conditions of components. However, it will be apparent to those skilled in the art that these concepts may be practiced without these specific details.
[0017]
FIG. 1 illustrates an environment architecture 100 for implementing a system for 20 operating a DC-DC converter in a vehicle, in accordance with an embodiment of the present disclosure. The environment architecture 100 may be associated with a vehicle constituted by a supply unit 101, a motor 102, a system 103, the DC-DC converter 104, and an auxiliary unit 105. All the elements of the environment architecture 100 illustrated in FIG. 1 are essential elements, however the environment architecture 100 may be implemented by more elements than the elements illustrated in 25 FIG. 1. However, the same are not explained for the sake of brevity.
7
[0018]
In an embodiment, the supply unit 101 may include a battery and a battery control unit. 5 The Battery may be described as energy storage devices that utilize various chemical reactions to store and/or distribute electrical power, for example SLI batteries, Lead-acid, Alkane, Li-ion, Ai-air, Nickel-cadmium, Zinc and deep cycle batteries. The Battery control unit may also be a battery management system that may be configured to regulate and monitor an operation of a battery during charging and discharging. The Battery along with the battery control unit in vehicle may efficiently provide voltage 10 to different load of a vehicle as per the requirement.
[0019]
In an embodiment, the motor 102 may be an essential component for converting electrical energy from the supply unit 101 into mechanical energy to drive wheels (not shown in figs.) of the vehicle. The motor 102 may include various types of motor, not limited to, such as an AC induction motor, a brushless DC (BLDC) motor, a Permanent Magnet Synchronous Motor (PMSM), an 15 Induction Motor (IM), a DC motor, and an AC motors.
[0020]
In an embodiment, the system 103 may be configured to operate the DC-DC converter 104 with optimal conditions in the environment architecture 100. The detailed functioning of the system 103, in conjunction with other elements is disclosed in Fig. 1, and is further explained in Fig. 2-4 in forthcoming paragraphs of the present disclosure. 20
[0021]
In an embodiment, the DC-DC converter 104 may operate through the system 103. The DC-DC converter 104 may be configured to convert high-voltage DC power from the supply unit 101 to a lower DC voltage suitable for components associated with the auxiliary unit 105. The output from the DC-DC converter 104 may be supplied to the auxiliary unit 105.
[0022]
In an embodiment, the auxiliary unit 105 may be operated through the DC-DC converter 25 104 in environment architecture 100. The auxiliary unit 105 may refer to the various electrical systems and components that consume power but are not directly involved in propulsion. The auxiliary unit
8
105 may include
headlights, actuators, a wiper control, vehicle access units, window motors, an 5 infotainment system, a power steering, a battery cooling and a brake system, and/or the like.
[0023]
Moving towards FIG. 2 that illustrate an equivalent circuit representation of a system 200 (same as 103 of Fig.1), in accordance with an embodiment of the present disclosure. According to an embodiment of the present disclosure, the system 200 may constitute a transistor circuitry 201 and an activation circuit 202. All the elements of the system 200 illustrated in FIG. 2 are essential elements, 10 and the system 200 may be implemented by more elements than the elements illustrated in FIG. 2, however the same are not explained for the sake of brevity. All the elements of the system 200 may communicate with each other via electric connection.
[0024]
In an embodiment, the transistor circuitry 201 may include a first transistor circuit 203 and a second transistor circuit 204. The first transistor circuit 203 may include a first transistor Q1, a 15 voltage-regulating diode Z1, a capacitor C1, and a voltage divider circuit. The voltage divider circuit may be include two resistors R1 and R2 electrically connected to each other to divide the supply voltage through the voltage-regulating diode Z1.
[0025]
In an embodiment, the voltage-regulating diode Z1 may be, not limited to, a Zener diode. The Zener diode may be a type of semiconductor device designed to allow current to flow in the 20 reverse direction when a specific reverse voltage, called the Zener voltage, is reached. The Zener voltage may be a point at which the diode undergoes breakdown and maintains a nearly constant voltage across its terminals, regardless of changes in the current passing through it.
[0026]
In an embodiment, a cathode terminal of the voltage-regulating diode Z1 may be connected to the supply unit 101 and an anode terminal of the voltage-regulating diode Z1 may be connected to 25 the voltage divider circuit in order to divide the supply voltage received from the supply unit 101 via the voltage-regulating diode Z1. The voltage divider circuit may be further connected to the first
9
transistor
Q1 through the parallel connection of the capacitor C1. The first transistor Q1 may be an 5 NPN Bipolar Junction Transistor (BJT). In an another embodiment, first transistor Q1 may be an MOSFET. However, for sake for understanding, the present disclosure is explained by considering the first transistor Q1 may be the BJT.
[0027]
In an embodiment, the first transistor Q1 may have three terminals i.e., an emitter terminal E, a base terminal B, and a collector terminal C. The emitter terminal E of the first transistor Q1 may 10 be connected to ground, the collector terminal C of the first transistor Q1 may be connected to the second transistor Q2 of the second transistor circuit 204. The collector terminal C may act as an input for the second transistor circuit 204. Further, the base terminal B of the first transistor Q1 may be connected to supply unit 101 through the voltage divider circuit.
[0028]
The second transistor circuit 204 may include a second transistor Q2, a voltage-regulating 15 diode Z2, resistors (R3 and R4), and a capacitor C2. The second transistor Q2 may be N-Channel Metal Oxide Semiconductor Field Effect Transistor (MOSFET). In an another embodiment, the second transistor Q2 may be the BJT. However, for sake for understanding, the present disclosure is explained by considering the second transistor Q2 may be the MOSFET. The gate terminal of the second transistor Q2 may be connected to the supply unit 101 through the R3 and the R4 and to the collector 20 terminal of the first transistor circuit 203 through the R4. The capacitor C2 and the resistor R5 may be connected in parallel and to the ground. The parallel connection of the capacitor C2 and the resistor R5 may be connected in series to the resistor R4 and may be connected in parallel between gate and source terminal of the second transistor Q2. The source terminal of the second transistor Q2 may be connected to ground and to the drain terminal through current limiting PN junction diode. The drain 25 terminal of the second transistor Q2 may be connected to the activation circuit 202. The cathode
10
terminal of the
voltage regulator diode Z2 may be connected to the supply unit 101 through the resistor 5 R3 and the anode terminal may be connected to the ground.
[0029]
In an embodiment, the activation circuit 202 may include a voltage-regulating diode Z3, a charging circuit 205, and resistors. The cathode terminal of the voltage regulator diode Z3 may be connected to the supply unit 101 through a resistor R8 and the anode terminal may be connected to the ground. The resistor R8 may be further connected to another resistor R7. 10
[0030]
In one embodiment, the charging circuit 205 may include a resistor R7. Further, the charging circuit 205 may include series connected resistor R6 and capacitor C3. The series connection of the resistor R6 and capacitor C3 may be connected to the resistor R7 through the terminal T1. The terminal T1 may be a junction in order to connect the DC-DC converter 104 with one of the second transistor Q2 and the activation circuit 202 based on the functioning of the system 200. 15
[0031]
In another embodiment, the charging circuit 205 may include resistor R7, capacitor C3, and the resistor R6. Each connected through terminal T1 is parallel.
[0032]
In the system 200, where the transistor circuitry 201 and the activation circuit 202 comprising arrangement of capacitors, resistors, voltage regulator diodes, the MOSFET, and the BJT. The arrangement of the components in the system 200 may be configured to provide an ON-time 20 delay to DC-DC converter 104 for enablement of efficient operation of DC-DC conversion process. The arrangement discloses plurality of capacitors for energy storage, power conditioning, electronic noise filtering, remote sensing and signal coupling/decoupling. Further, resistors, PN diode may be provided for at least one of reducing current flow, adjusting signal levels, configured as a voltage divider, bias active elements, among other uses. In the present disclosure, the capacitor, resistors, 25 voltage regulator diodes and both the transistors are used but this should not be construed as the limitation.
11
[0033]
In an embodiment, the system 200 may comprise the transistor circuitry 201 and the 5 activation circuit 202 that is connected to the supply unit 101 to receive supply voltage and generate fixed time delay for DC-DC converter 104. The transistor circuitry 201 may be connected for controlling the activation circuit 202 suitably for efficient operating of the DC-DC converter 104 based on the supply unit 101. The fixed delay depends upon the charging or discharging time of the capacitor C3 of the charging circuit 205. 10
[0034]
The transistor circuitry 201 may be configured to operate the activation circuit 202 under different voltage supplied from the supply unit 101. The operating state of the transistor circuitry 201 and the activation circuit 202 may be defined by the threshold voltage of voltage-regulating diodes Z1-Z3 or may be defined by the power/voltage ratings of the voltage-regulating diodes Z1-Z3. The ratings of the voltage-regulating diodes Z1-Z3 may be defined by the application and voltage /power 15 requirement of the DC-DC converter 104 and should not be construed as the limitation.
[0035]
The detailed functioning of the system 200 is further explained in Fig. 3 and Fig.4 in forthcoming paragraphs of the present disclosure.
[0036]
Now moving towards FIG.3 in order to understand the functioning of the system 200 during high supply voltage from the supply unit 101, in accordance with an embodiment of the present 20 disclosure. In an embodiment, the high supply voltage of the supply unit 101 may be associated with starting (ignition on) of the vehicle.
[0037]
Fig. 3 illustrates the equivalent circuit representation of the system during high supply voltage from the supply unit, in accordance with an embodiment of the present disclosure.
[0038]
In an embodiment, the transistor circuitry 201 and the activation circuit 202 configured to 25 receive supply voltage via supply unit 101 and configured to operate in different states to control the activation circuit 202 to generate fixed delay voltage signal. In Fig. 3, the operation state is illustrated
12
where the supply voltage drawn from the supply unit 101 is greater than the threshold value.
The 5 threshold value is a breakdown voltage of any of the voltage-regulating diode Z1, Z2 and Z3 as disclosed in forthgoing paragraphs of the Fig.2.
[0039]
When the supply voltage is greater than a threshold voltage, the transistor circuitry 204 may be configured to operate in the off state and enable the activation circuit 202 to generate the fixed delay voltage signal based on the off state of the transistor circuitry. 10
[0040]
In particular, when the supply voltage drawn from the supply unit 101 is greater than the threshold value, the first transistor circuit 203 may be configured to draw current from supply unit 101 via a path P3. This current from supply unit 101 via P3 may provide sufficient voltage to set the first transistor Q1 in a saturation state. When the first transistor Q1 is in the saturation state, the current may flow via a path P2 from supply unit 101 to ground. On the other hand, the second transistor Q2 15 of the second transistor circuit 204 may be in an cutoff state based on the saturation state of the first transistor Q1. Because of the cutoff state of the second transistor Q2, the charging circuit 205 may be charged to through the Zener diode Z3 via the resistor R7. This charging process continues until the capacitor C3 within the charging circuit 205 becomes fully charged. Once, the capacitor C3 is charged, the voltage regulated at the voltage-regulated diode Z3 may be provided to the DC-DC converter 104. 20 In an embodiment, the charging circuit 205 within the activation circuit 202 is designed to provide a voltage signal to operate the DC-DC converter 104 after a fixed time delay, following the application of the high supply voltage from the supply unit 101. This delay is achieved by the gradual charging of the capacitor C3 via the supply unit 101. The time required to charge the capacitor C3 may be as shown below in equation 1: 25
T = R7C3 (1)
13
[0041]
In an embodiment, time constant may be changed by varying the value of resistor R7 and 5 C3.
[0042]
In an embodiment, as the supply voltage is variable in nature, it may be difficult to get fixed time delay during each operation of starting of the vehicle. Thus, in the present disclosure, the Zener diode Z3 may be used to protect inconsistency due to frequency of operation and charging of the capacitor C3. The Zener diode Z3 may supply the fixed supply voltage to the capacitor C3 via 10 Resistor R7. In other words, the flow of fixed voltage from the Zener diode D1 may be responsible for providing the fixed time delay voltage signal to DC-DC converter 104.
[0043]
Fig. 3 is explained by highlighting operating states along with flow of current via defining P2 and P3, through arrows in the circuit.
[0044]
In a non-limiting example of the present disclosure, At time t1, the high supply voltage is 15 provided by the supply unit 101 to the transistor circuitry 201. The first transistor Q1 and the second transistor Q2 may be configured to enable the charging circuit 205 in order to charge the capacitor C3 through the resistor R7.
[0045]
After a fixed delay caused by the time required for capacitor C3 to charge (determined by the time constant (i.e., T = R7C3) of the charging circuit), at time t2 (i.e., t2 = t1 + t3) the capacitor is 20 fully charged. The output voltage regulated through the voltage-regulated device is then provided to the DC-DC converter 104 at a time t2, enabling it to begin operation.
[0046]
In an embodiment, the charging circuit 205 may be configured to charge the capacitor in such a way that it provides a fixed delay in the generation of the voltage signal relative to the predetermined voltage rating of the voltage-regulating diode and independent of the supply voltage. 25 In particular, the charging circuit may be designed to charge the capacitor by utilizing the supply unit 101 in a manner that ensures a consistent delay in the generation of the voltage signal. This fixed delay
14
is determined with respect to the predetermined voltage rating of the voltage
-regulating diode and 5 remains unaffected by fluctuations in the supply voltage provided by the supply unit 101.
[0047]
For example, if the supply voltage is 50V, the delay may be determined by the time constant RC, with respect to the voltage rating of the voltage-regulating diode, may be 10ms. Even if the supply voltage fluctuates from 50V, the delay will still be 10ms with respect to the voltage rating of the voltage-regulating diode. This ensures that the delay remains constant whether the supply 10 voltage is 50V or changes in either direction.
[0048]
FIG. 4 illustrates the equivalent circuit representation of the system during low supply voltage from the supply unit 101, in accordance with another embodiment of the present disclosure.
[0049]
In an embodiment, if the supply is less than the threshold voltage, the transistor circuitry 201 may be configured to operate in the on state and restrict the activation circuit 202 to generate the 15 fixed delay voltage signal based on the on state of the transistor circuitry 201.
[0050]
In an embodiment of Fig.4, when the supply voltage drawn from the supply unit 101 is less than the threshold value, the first transistor Q1 of the first transistor circuit 203 may be configured to operate in the cutoff state and the second transistor Q2 of the second transistor circuit 204 may be configured operate in the saturation state. When the first transistor Q1 is in cutoff state, no current 20 flows via path P2 and path P3. On the other hand, the second transistor, MOSFET Q2 operates in the saturation state based on the supply voltage from the supply unit 101. The saturation state of the MOSFET Q2 providing low resistance path to ground. Due to saturation state of the second transistor Q2, the charging circuit 205 comprising of C3 may be discharged via a path P5 to ground. This discharging process continues until the capacitor C3 within the charging circuit 205 becomes fully 25 discharged. This allows the supply voltage at this low threshold level to be routed directly to ground rather than to the DC-DC converter 104.
15
[0051]
Consequently, the DC-DC converter may receive no output voltage signal during this 5 operation state, ensuring that it remains in an OFF state. This prevents improper operation of the DC-DC converter 104 when the supply voltage from supply unit 101 is insufficient to meet the required threshold. Furthermore, the MOSFET Q2 also facilitates the rapid discharge of the capacitor C3 through its low-resistance path to ground, ensuring quick removal of residual
[0052]
Fig. 4 is explained by highlighting operating states along with flow of current via defining 10 paths P4 and P5, through arrows in the circuit.
[0053]
The present disclosure, in view of the system 200, provides ON time delay to DC-DC converter without making use of any enable pin. As a result, it saves the cost and complexity of the system.
[0054]
Further, the DC-DC converter 104 with the disclosed system 200 will require only a 3-pin 15 coupler. Thus, the cost is saved in couplers as conventional architecture of the DC-DC converter 104 with enable circuit requires a 4-pin coupler.
[0055]
The present disclosure also provides cost saving of auxiliary batteries. For instance, when there is extra load incurred during the startup operation of the vehicle, the auxiliary battery of higher rating is required. This is because the DC-DC converter without enable circuit needs high in-rush 20 current from the battery.
[0056]
The proposed DC-DC architecture with the system 103, eliminates the need of auxiliary battery. Further, the present disclosure also provides another advantage of mitigation of the in-rush current which may damage the sensitive components of the DC-DC converter.
[0057]
The present disclosure also provides a fixed and consistent delay that is independent of 25 fluctuations in the supply voltage. This stability in delay, determined by the time constant of the RC
16
circuit
relative to the voltage rating of the voltage regulating diode, ensures the reliable operation of 5 the voltage-regulated diode and the DC-DC converter, regardless of supply voltage variations.
[0058]
The foregoing figures descriptions and the current flow in diagrams are provided merely as illustrative examples. As will be appreciated by one of skill in the art the operating states in the foregoing embodiments may be performed in any order. Further, any reference to claim elements in the singular, for example, using the articles “a,” “an” or “the” is not to be construed as limiting the 10 element to the singular.
[0059]
The terms “including”, “comprising”, “having” and variations thereof mean “including but not limited to”, unless expressly specified otherwise.
[0060]
Many modifications and other embodiments of the inventions set forth herein will come to mind to one skilled in the art to which these inventions pertain having the benefit of teachings 15 presented in the foregoing descriptions and the associated drawings. Although the figures only show certain components of the systems described herein, it is understood that various other components may be used in conjunction with the system. Therefore, it is to be understood that the inventions are not to be limited to the specific embodiments disclosed and that modifications and other embodiments are intended to be included within the scope of the appended claims. Moreover, the steps in the method 20 described above may not necessarily occur in the order depicted in the accompanying diagrams, and in some cases one or more of the steps depicted may occur substantially simultaneously, or additional steps may be involved. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
[0061]
Finally, the language used in the specification has been principally selected for readability 25 and instructional purposes, and it may not have been selected to delineate or circumscribe the inventive subject matter. It is therefore intended that the scope of the invention be limited not by this
17
detailed description, but rather by any claims that issue on an application based here on. Accordingly,
5 the embodiments of the present invention are intended to be illustrative, but not limiting, of the scope of the invention, which is set forth in the appended claims.
10
15
20
25
30
18
We Claim: 5
1. A system (200) for operating a DC-DC converter, the system comprising:
an activation circuit (202) configured to connect with a supply unit to receive supply voltage; and
a transistor circuitry (201) configured to connect with the supply unit to receive the supply 10 voltage and configured to control the activation circuit for operating the DC-DC converter based on the supply voltage, wherein, to operate the DC-DC converter, the transistor circuitry (201) is configured to:
operate in one of an on state and off state based on the supply voltage; and
control the activation circuit to generate fixed delay voltage signal based on the operating state 15 of the transistor circuitry to provide the fixed delay voltage signal to the DC-DC converter, wherein the fixed delay voltage signal is generated based on the supply voltage.
2. The system (200) as claimed in claim 1, wherein
if the supply voltage is greater than a threshold voltage: 20
the transistor circuitry (201) is configured to operate in the off state and enable the activation circuit to generate the fixed delay voltage signal based on the off state of the transistor circuitry; and
if the supply is less than the threshold voltage:
the transistor circuitry (201) is configured to operate in the on state and restrict the activation 25 circuit to generate the fixed delay voltage signal based on the on state of the transistor circuitry (201).
3. The system (200) as claimed in claim 2, wherein the activation circuit comprises:
19
a voltage-regulating diode configured to connect between the supply unit and the DC-DC 5 converter, and configured to generate a voltage signal based on the supply unit; and
a charging circuit configured to connect between the supply unit and the DC-DC converter, wherein the charging circuit is connected in parallel with the voltage-regulating diode of a predetermined voltage rating and comprises an RC circuit, and wherein the charging circuit is configured to charge the RC circuit by using the supply unit to provide a fixed delay in 10 generation of the voltage signal relative to the predetermined voltage rating of said voltage regulating diode and independent of the supply voltage.
4. The system (200) as claimed in claim 3, wherein the fixed delay is associated with a charging time of the RC circuit and the supply voltage generated by said supply unit. 15
5. The system (200) as claimed in claim 3, wherein the transistor circuity comprises:
a first transistor circuit comprising a first transistor and a voltage-regulating diode, wherein an input of the first transistor is configured to connect with the supply unit via the voltage regulating diode; and 20
a second transistor circuit comprising a second transistor connected with an output of the first transistor circuit, wherein the second transistor circuit is configured to connect with the supply unit, wherein the output of the second transistor circuit is connected with the activation circuit.
6. The system (200) as claimed in claim 5, wherein: 25
if the supply voltage is greater than the threshold voltage:
the first transistor is configured operate in a saturation state based on the supply voltage of the supply unit and generate a saturated voltage; and
20
the second transistor is configured to operate in a cutoff state based on the saturated voltage 5 enabling the generation of the fixed delay voltage signal by the activation circuit.
7. The system (200) as claimed in claim 5, wherein:
if the supply voltage is less than the threshold voltage:
the first transistor is configured operate in a cutoff state based on the supply voltage of the 10 supply unit; and
the second transistor is configured to operate in a saturation state based on the cutoff state of the first transistor and the supply voltage of the supply unit disabling the generation of the fixed delay voltage signal by the activation circuit.
15
8. The system (200) as claimed in claim 5, wherein the threshold value is a breakdown voltage of the voltage-regulating diode.
9. The system (200) as claimed in claim 7, wherein the second transistor is configured to discharge energy stored in the charging circuit. 20
10. The system (200) as claimed in claim 5, wherein the first transistor and the second transistor is a bipolar junction transistor or a metal-oxide-semiconductor field-effect transistor.