Power supply control circuit and energy storage system

Abstract

The application relates to a power supply control circuit and an energy storage system. The power supply control circuit comprises a power supply circuit, an identification module, a control module and a pulse generation module; the identification module is used for outputting a critical signal when a voltage difference between an input end and an output end of the power supply circuit is switched to a critical voltage area; the critical voltage area is between a voltage boosting area and a voltage reducing area; the control module is used for outputting a trigger signal when the critical signal is received, and outputting a first voltage boosting pulse width modulation signal after a preset time interval to drive a voltage conversion module to be in a continuous voltage boosting working state; the pulse generation module is used for outputting a single pulse signal to drive the voltage conversion module to perform a voltage boosting working cycle when the trigger signal is received; wherein the time of outputting the first voltage boosting pulse width modulation signal is after the time of outputting the single pulse signal. The power supply control circuit can improve the power supply reliability of the power supply circuit.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and in particular to a power supply control circuit and an energy storage system. Background Technology

[0002] In energy storage systems such as photovoltaic energy storage systems, vehicle-to-grid systems, and portable energy storage power supplies, voltage conversion modules are installed in the power supply circuit between the voltage source and the load to achieve voltage adaptation and energy transfer between the voltage source and the load.

[0003] The voltage difference between the input and output terminals of the power supply circuit will switch between three voltage ranges: the boost region, the critical voltage region, and the buck region.

[0004] However, when the voltage difference switches to the critical voltage region, it can easily lead to an interruption in the power transmission of the power supply circuit, reducing the power supply reliability of the power supply circuit. Summary of the Invention

[0005] Based on this, this application provides a power supply control circuit and an energy storage system that can improve the power supply reliability of the power supply circuit.

[0006] In a first aspect, this application provides a power supply control circuit, which includes a power supply circuit, an identification module, a control module, and a pulse generation module. The power supply circuit includes a voltage conversion module. The first input terminal of the identification module is connected to the input terminal of the power supply circuit, the second input terminal of the identification module is connected to the output terminal of the power supply circuit, the output terminal of the identification module is connected to the input terminal of the control module, the trigger signal output terminal of the control module is connected to the trigger terminal of the pulse generation module, and the modulation terminal of the control module and the output terminal of the pulse generation module are both connected to the control terminal of the voltage conversion module.

[0007] The identification module is used to output a critical signal when the voltage difference between the input and output terminals of the power supply circuit switches to the critical voltage region; the critical voltage region is between the boost region and the buck region.

[0008] The control module is used to output a trigger signal when a critical signal is received, and output a first boost pulse width modulation signal after a preset time interval, so as to drive the voltage conversion module to be in a continuous boost working state.

[0009] The pulse generation module is used to output a single pulse signal when a trigger signal is received, so as to drive the voltage conversion module to perform one boost working cycle; wherein, the time of outputting the first boost pulse width modulation signal is after the time of outputting the single pulse signal.

[0010] In some embodiments, the identification module is further configured to output a buck signal when the voltage difference switches to the buck region and to output a boost signal when the voltage difference switches to the boost region;

[0011] The control module is also used to output a buck pulse width modulation signal when a buck signal is received, so as to drive the voltage conversion module to operate in a continuous buck state; and to output a second boost pulse width modulation signal when a boost signal is received, so as to drive the voltage conversion module to operate in a continuous boost state.

[0012] In some embodiments, the critical voltage region ranges from the difference between the on-state voltage drop of the power supply circuit and the preset voltage threshold to the sum of the on-state voltage drop of the power supply circuit and the preset voltage threshold.

[0013] In some embodiments, the power supply control circuit further includes a current detection module, the input terminal of which is connected to the power path of the voltage conversion module, and the output terminal of which is connected to the detection terminal of the control module.

[0014] The current detection module is used to detect and output the current detection signal of the power path;

[0015] The control module is also used to output a first boost pulse width modulation signal when it detects that the current corresponding to the current detection signal exceeds a preset current threshold after the output trigger signal.

[0016] In some embodiments, the protection terminal of the control module is also connected to the reset terminal of the pulse generation module;

[0017] The control module is also used to output a protection signal when the power supply control circuit enters the protection mode after the output trigger signal is detected; and to output a first boost pulse width modulation signal when the power supply control circuit does not enter the protection mode after the output trigger signal is detected.

[0018] The pulse generation module is also used to terminate the output of a single pulse signal when a protection signal is received.

[0019] In some embodiments, the power supply control circuit further includes a first diode and a second diode;

[0020] The modulation terminal of the control module is connected to the anode of the first diode, and the cathode of the first diode is connected to the control terminal of the voltage conversion module;

[0021] The output of the pulse generation module is connected to the anode of the second diode, and the cathode of the second diode is connected to the cathode of the first diode.

[0022] In some embodiments, the voltage conversion module includes a first switching transistor, a second switching transistor, a third diode, a fourth diode, and an energy storage inductor;

[0023] The first conducting terminal of the first switching transistor is connected to the input terminal of the power supply circuit, the control terminal of the first switching transistor is connected to the modulation terminal of the control module, the second conducting terminal of the first switching transistor is connected to the cathode of the third diode, and the anode of the third diode is grounded.

[0024] The cathode of the fourth diode is connected to the output terminal of the power supply circuit, the anode of the fourth diode is connected to the first conducting terminal of the second switching transistor, the second conducting terminal of the second switching transistor is grounded, and the control terminal of the second switching transistor is connected to the modulation terminal of the control module.

[0025] The cathode of the third diode is also connected to the first terminal of the energy storage inductor, and the second terminal of the energy storage inductor is also connected to the anode of the fourth diode.

[0026] In some embodiments, the identification module includes an amplification unit and a comparison unit; the first input terminal of the amplification unit is connected to the input terminal of the power supply circuit, the second input terminal of the amplification unit is connected to the output terminal of the power supply circuit, the output terminal of the amplification unit is connected to the input terminal of the comparison unit, and the output terminal of the comparison unit is connected to the input terminal of the control module.

[0027] The amplification unit is used to amplify the result of subtracting the output voltage of the power supply circuit from the input voltage of the power supply circuit and then subtracting the on-state voltage drop of the power supply circuit, and output an amplified voltage.

[0028] The comparator unit is used to output a critical signal when the absolute value of the received amplified voltage does not exceed a set voltage threshold.

[0029] In some embodiments, the amplification unit includes an input voltage sampling subunit, an output voltage sampling subunit, and a differential amplification subunit; the input terminal of the input voltage sampling subunit is connected to the input terminal of the power supply circuit, and the output terminal of the input voltage sampling subunit is connected to the first input terminal of the differential amplification subunit; the input terminal of the output voltage sampling subunit is connected to the output terminal of the power supply circuit, and the output terminal of the output voltage sampling subunit is connected to the second input terminal of the differential amplification subunit; the reference voltage of the differential amplification subunit is the inverse of the on-state voltage drop of the power supply circuit, and the output terminal of the differential amplification subunit is connected to the input terminal of the comparator unit;

[0030] The input voltage sampling subunit is used to sample and output the input voltage of the power supply circuit;

[0031] The output voltage sampling subunit is used to sample and output the output voltage of the power supply circuit;

[0032] The differential amplifier subunit is used to amplify the result of subtracting the output voltage of the power supply circuit from the input voltage of the power supply circuit and then subtracting the on-state voltage drop of the power supply circuit, and outputting an amplified voltage.

[0033] Secondly, this application provides an energy storage system, which includes a voltage source, a load, and a power supply control circuit. The power supply control circuit includes a power supply circuit, an identification module, a control module, and a pulse generation module. The power supply circuit is provided with a voltage conversion module. The first input terminal of the identification module is connected to the input terminal of the power supply circuit, the input terminal of the power supply circuit is connected to the voltage source, the second input terminal of the identification module is connected to the output terminal of the power supply circuit, the output terminal of the power supply circuit is connected to the load, the output terminal of the identification module is connected to the input terminal of the control module, the trigger signal output terminal of the control module is connected to the trigger terminal of the pulse generation module, and the modulation terminal of the control module and the output terminal of the pulse generation module are both connected to the control terminal of the voltage conversion module.

[0034] The identification module is used to output a critical signal when the voltage difference between the input and output terminals of the power supply circuit switches to the critical voltage region; the critical voltage region is between the boost region and the buck region.

[0035] The control module is used to output a trigger signal when a critical signal is received, and output a first boost pulse width modulation signal after a preset time interval, so as to drive the voltage conversion module to be in a continuous boost working state.

[0036] The pulse generation module is used to output a single pulse signal when a trigger signal is received, so as to drive the voltage conversion module to perform one boost working cycle; wherein, the time of outputting the first boost pulse width modulation signal is after the time of outputting the single pulse signal.

[0037] In the technical solution provided in this application embodiment, when the voltage difference between the input and output terminals of the power supply circuit switches to the critical voltage region, the control module immediately outputs a trigger signal to cause the pulse generation module to output a single pulse signal to drive the voltage conversion module to perform one boost working cycle. Then, it outputs a first boost pulse width modulation signal to drive the voltage conversion module to be in a continuous boost working state. Thus, even if there is a large time delay between the moment when the voltage difference between the input and output terminals of the power supply circuit switches from the boost region or buck region to the critical voltage region and the moment when the control module starts to output the first boost pulse width modulation signal, the voltage conversion module can perform one boost working cycle within this time delay. This allows for earlier boost control of the voltage conversion module, reducing the problem of reduced power supply reliability caused by delayed boost control of the voltage conversion module, thereby improving the power supply reliability of the power supply circuit. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 A schematic diagram of the power supply control circuit provided in the first embodiment;

[0040] Figure 2 A schematic diagram of the power supply control circuit provided in the second embodiment;

[0041] Figure 3 A schematic diagram of the power supply control circuit provided in the third embodiment;

[0042] Figure 4 A schematic diagram of the power supply control circuit provided in the fourth embodiment;

[0043] Figure 5 A schematic diagram of the power supply control circuit provided in the fifth embodiment;

[0044] Figure 6 A schematic diagram of the power supply control circuit provided in the sixth embodiment;

[0045] Figure 7 A schematic diagram of the power supply control circuit provided in the seventh embodiment;

[0046] Figure 8 A circuit diagram of an energy storage system provided for some embodiments. Detailed Implementation

[0047] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0049] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined. In the description of the embodiments of this application, "each" means each of the multiple options, unless otherwise explicitly defined.

[0050] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0051] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0052] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0053] Figure 1 A schematic diagram of the power supply control circuit provided in the first embodiment is shown below. Figure 1 As shown, the power supply control circuit includes a control module and a power supply circuit. The power supply circuit includes a voltage conversion module, which is connected to the control module. The control module is also connected to the power path of the power supply circuit. The control module is used to detect whether the voltage difference between the input and output terminals of the power supply circuit is in the buck region, boost region, or critical voltage region, and performs corresponding control on the voltage conversion module according to the voltage region in which the voltage difference is located.

[0054] For example, the input terminal of the power supply circuit is used to connect to a voltage source, and the output terminal of the power supply circuit is used to connect to a load. For example, the voltage conversion module is a DC-DC conversion module. For example, the voltage source may include a photovoltaic module or a battery. For example, the load may include a battery or a DC bus.

[0055] When the voltage difference between the input and output terminals of the power supply circuit is greater than the maximum value of the critical voltage region, the voltage difference is in the step-down region, and the control module controls the voltage conversion module to operate in a continuous step-down state.

[0056] When the voltage difference between the input and output terminals of the power supply circuit is less than the minimum value of the critical voltage region, the voltage difference is in the boost region, and the control module controls the voltage conversion module to operate in a continuous boost working state.

[0057] When the input voltage and output voltage of the power supply circuit are close, i.e., the voltage difference between the input and output terminals is in the critical voltage range, if the control module controls the voltage conversion module to operate in a direct-through mode, neither boosting nor bucking the voltage, the electrical energy at the input terminal of the power supply circuit cannot be effectively and reliably transferred to the output terminal, and normal power supply from the voltage source to the load cannot be achieved. Therefore, when the voltage difference between the input and output terminals of the power supply circuit is in the critical voltage range, the control module controls the voltage conversion module to operate in a continuous boost mode.

[0058] The control module outputs a corresponding pulse width modulation (PWM) signal to the voltage conversion module to enable the voltage conversion module to operate in either a continuous boost or continuous buck mode. However, there is a significant time delay between the moment t1 when the voltage difference between the input and output terminals of the power supply circuit switches between different ranges and the moment t2 when the control module begins outputting the corresponding PWM signal.

[0059] For example, at time t1, the voltage difference between the input and output terminals of the power supply circuit switches from the step-down region to the critical voltage region. However, between time t1 and t2, the control module still controls the voltage conversion module to operate in the step-down mode. Since the voltage difference across the energy storage inductor in the voltage conversion module is close to zero, it is impossible to effectively charge the energy storage inductor. Consequently, the electrical energy at the input terminal of the power supply circuit cannot be effectively transferred to the output terminal of the power supply circuit, and the normal power supply to the load cannot be achieved, thus reducing the power supply reliability of the power supply circuit.

[0060] For example, at time t1, the voltage difference between the input and output terminals of the power supply circuit switches from the boost region to the critical voltage region. However, between time t1 and t2, the control module still controls the voltage conversion module to operate in the boost mode. That is, the control module still outputs the boost PWM signal corresponding to the boost region, which causes the operation of the voltage conversion module to be mismatched with the state of the power supply circuit, reducing the power supply reliability of the power supply circuit.

[0061] Based on this, the power supply control circuit provided in this application embodiment can improve the power supply reliability of the power supply circuit.

[0062] Figure 2 A schematic diagram of the power supply control circuit provided in the second embodiment is shown below. Figure 2 As shown, the power supply control circuit includes a power supply circuit, an identification module, a control module, and a pulse generation module. The power supply circuit is equipped with a voltage conversion module. The first input terminal of the identification module is connected to the input terminal of the power supply circuit, the second input terminal of the identification module is connected to the output terminal of the power supply circuit, the output terminal of the identification module is connected to the input terminal of the control module, the trigger signal output terminal of the control module is connected to the trigger terminal of the pulse generation module, and the modulation terminal of the control module and the output terminal of the pulse generation module are both connected to the control terminal of the voltage conversion module.

[0063] The identification module is used to output a critical signal when the voltage difference between the input and output terminals of the power supply circuit switches to the critical voltage region; the critical voltage region is between the boost region and the buck region; the control module is used to output a trigger signal when the critical signal is received, and output a first boost pulse width modulation signal after a preset time interval to drive the voltage conversion module to be in a continuous boost operation state; the pulse generation module is used to output a single pulse signal when the trigger signal is received to drive the voltage conversion module to perform one boost operation cycle; wherein, the time for outputting the first boost pulse width modulation signal is after the time for outputting the single pulse signal.

[0064] When the voltage difference between the input and output terminals of a power supply circuit is in the boost region, the circuit is suitable for boosting. When the voltage difference is in the buck region, the circuit is suitable for bucking. The critical voltage region lies between the boost and buck regions.

[0065] The buck region is the voltage range where the voltage exceeds the maximum value of the critical voltage region. The boost region is the voltage range where the voltage is below the minimum value of the critical voltage region.

[0066] A single pulse signal is used to drive the voltage conversion module to perform one boost cycle. The single pulse signal is a pulse waveform with width and amplitude. Exemplarily, the width of the single pulse signal is a fixed value. The width of the single pulse signal represents the pulse duration. In this embodiment, the width of the single pulse signal is the same as the pulse width of the first boost pulse width modulation signal. In other embodiments, the width of the single pulse signal is different from the pulse width of the first boost pulse width modulation signal; this is not a limitation.

[0067] Among them, the boost pulse width modulation signal refers to the pulse width modulation signal used to drive the voltage conversion module to a continuous boost operation state.

[0068] Unless otherwise specified, the boost pulse width modulation signal in the embodiments of this application can be either a first boost pulse width modulation signal or a second boost pulse width modulation signal.

[0069] In this embodiment, when a critical signal is received, the output trigger signal is a hardware-level response, and the output first boost pulse width modulation signal is a software-level response. In this embodiment, when a trigger signal is received, the output single-pulse signal is a hardware-level response.

[0070] In this embodiment, the trigger signal is a low-level signal. In other embodiments, the trigger signal can be a high-level signal, and this embodiment does not limit this.

[0071] The preset duration is the time between the moment the trigger signal is output and the moment the first boost pulse width modulation signal is generated.

[0072] Among them, the signal output delay of hardware-level response is much smaller than that of software-level response.

[0073] In the technical solution provided in this application embodiment, when the voltage difference between the input and output terminals of the power supply circuit switches to the critical voltage region, the control module immediately outputs a trigger signal to cause the pulse generation module to output a single pulse signal to drive the voltage conversion module to perform one boost working cycle. Then, it outputs a first boost pulse width modulation signal to drive the voltage conversion module to be in a continuous boost working state. Thus, even if there is a large time delay between the moment when the voltage difference between the input and output terminals of the power supply circuit switches from the boost region or buck region to the critical voltage region and the moment when the control module starts to output the first boost pulse width modulation signal, the voltage conversion module can perform one boost working cycle within this time delay. This allows for earlier boost control of the voltage conversion module, reducing the problem of reduced power supply reliability caused by delayed boost control of the voltage conversion module, thereby improving the power supply reliability of the power supply circuit.

[0074] In some embodiments, the identification module is further configured to output a buck signal when the voltage difference switches to the buck region; the control module is further configured to output a buck pulse width modulation signal when the buck signal is received, so as to drive the voltage conversion module to be in a continuous buck operation state.

[0075] In some embodiments, the identification module is further configured to output a boost signal when the voltage difference switches to the boost region; the control module is further configured to output a second boost pulse width modulation signal when the boost signal is received, so as to drive the voltage conversion module to be in a continuous boost operation state.

[0076] Specifically, switching from the voltage difference to the boost region refers to the voltage difference switching from the critical voltage region to the boost region. Switching from the voltage difference to the buck region refers to the voltage difference switching from the critical voltage region to the buck region.

[0077] For example, the second boost pulse width modulation signal has the same frequency and / or duty cycle as the first boost pulse width modulation signal. Alternatively, the second boost pulse width modulation signal may have a different frequency and / or duty cycle than the first boost pulse width modulation signal.

[0078] Both the output buck pulse width modulation signal and the output second boost pulse width modulation signal are software-level responses.

[0079] In the technical solution provided in this application embodiment, a buck signal is output when the voltage difference switches to the buck region and a boost signal is output when the voltage difference switches to the boost region. This provides a clear and unique trigger basis for the mode switching of the voltage conversion module. After receiving the corresponding signal, the control module outputs a matching buck pulse width modulation signal or a second boost pulse width modulation signal to drive the voltage conversion module to stably enter the continuous buck working state or the continuous boost working state, thereby improving the reliability of the mode switching process of the voltage conversion module.

[0080] In some embodiments, the critical voltage region ranges from the difference between the on-state voltage drop of the power supply circuit and a preset voltage threshold to the sum of the on-state voltage drop of the power supply circuit and the preset voltage threshold. This application is not limited to this; in other embodiments, the critical voltage region ranges from the negative of the preset voltage threshold to the preset voltage threshold itself. The preset voltage threshold is a voltage value close to 0 and greater than 0.

[0081] Figure 3 A schematic diagram of the power supply control circuit provided in the third embodiment is shown below. Figure 3 As shown, Figure 3 Compared to the example Figure 2The difference in the embodiments is that the control module includes a controller, which includes GPIO_A, GPIO_B, GPIO_C, PWM1, and PWM2 pins. GPIO_A and GPIO_B pins are connected to the output of the identification module. GPIO_C pin is connected to the trigger terminal of the pulse generation module. PWM1 and PWM2 pins are connected to the control terminal of the voltage conversion module. The control module also includes a VCC pin and a GND pin; the VCC pin is the power supply pin, and the GND pin is the ground pin. The voltage on the VCC pin is VCC.

[0082] When the level signals received by the GPIO_A and GPIO_B pins combine to form a critical signal, a trigger signal is first output on the GPIO_C pin through a hardware-level response, and a boost control signal (e.g., a signal used to continuously turn on the first switch in the voltage conversion module) is continuously output on the PWM1 pin. After a preset time interval, a first boost pulse width modulation signal (a signal used to periodically turn on the second switch in the voltage conversion module) is output on the PWM2 pin.

[0083] When the level signals received by the GPIO_A and GPIO_B pins are combined to form a boost signal, a boost control signal (e.g., a signal used to continuously turn on the first switch in the voltage conversion module) is output through the PWM1 pin. After a preset time interval, a second boost pulse width modulation signal (a signal used to periodically turn on the second switch in the voltage conversion module) is output through the PWM2 pin.

[0084] When the level signals received by the GPIO_A and GPIO_B pins are combined into a buck signal, a buck control signal (e.g., a signal used to continuously turn off the second switch in the voltage conversion module) is output through the PWM2 pin. After a preset time interval, a buck pulse width modulation signal (a signal used to periodically turn on the first switch in the voltage conversion module) is output through the PWM1 pin.

[0085] The pulse generation module may include a monostable multivibrator. The monostable multivibrator includes a TRIG pin (the trigger terminal of the pulse generation module) and an OUT pin (the output terminal of the pulse generation module). When a trigger signal is received at the trigger terminal of the pulse generation module, a single pulse signal is output. The monostable multivibrator also includes a VCC pin and a GND pin; the VCC pin is the power supply pin, and the GND pin is the ground pin. The voltage on the VCC pin is VCC.

[0086] The width of the single pulse signal is a fixed value. The following explains the principle behind the pulse generation module outputting a fixed-width single pulse signal:

[0087] The monostable multivibrator also includes DISCH, THRES, and RESET pins. The pulse generation module also includes resistors R1 and R2 and capacitor C1. The VCC pin is connected to the first end of resistor R1, the second end of resistor R1 is connected to the first end of resistor R2, the second end of resistor R2 is connected to the first end of capacitor C1, the second end of capacitor C1 is grounded, the second end of resistor R1 is also connected to the RESET pin to make the RESET pin high, and the second end of resistor R2 is also connected to the DISCH pin, which is connected to the THRES pin.

[0088] When the RESET pin is high and the TRIG pin does not receive a trigger signal (for example, the trigger signal is low, but the TRIG pin is currently receiving a high signal), the DISCH pin is internally grounded, and the OUT pin outputs a low signal. At this time, the voltage of capacitor C1 is 0.

[0089] When the RESET pin is high, and the TRIG pin receives a trigger signal (e.g., when the TRIG pin receives a low signal), the OUT pin outputs a high-level signal. At this time, the DISCH pin is no longer grounded, and VCC charges capacitor C1 through resistors R1 and R2. When the voltage across capacitor C1 exceeds a first voltage threshold, the THRES pin detects this and outputs a low-level signal. Thus, the high-level signal output by the OUT pin for a short period is a single-pulse signal.

[0090] Please continue reading. Figure 3 The pulse generation module also includes resistors R3 and R4. The first end of resistor R3 is connected to the VCC pin, and the second end of resistor R3 is connected to the OUT pin. The first end of resistor R4 is connected to the OUT pin, and the second end of resistor R4 is the output terminal of the pulse generation module.

[0091] Figure 4 A schematic diagram of the power supply control circuit provided in the fourth embodiment is shown below. Figure 4 As shown, Figure 4 Compared to the example Figure 3 The difference in the embodiment is that the power supply control circuit also includes a current detection module, the input terminal of which is connected to the power path of the voltage conversion module, and the output terminal of which is connected to the detection terminal of the control module.

[0092] The current detection module is used to detect and output the current detection signal of the power path; the control module is also used to output the first boost pulse width modulation signal when the current corresponding to the current detection signal exceeds the preset current threshold after the trigger signal is output.

[0093] In the technical solution provided in this application embodiment, when the control module outputs a trigger signal, it will continuously detect whether the current corresponding to the current detection signal of the power path exceeds a preset current threshold. If the current does not exceed the preset current threshold, even if the first boost pulse width modulation signal is generated, the first boost pulse width modulation signal will not be output. If the current exceeds the preset current threshold, the generated first boost pulse width modulation signal will be output.

[0094] Please continue reading. Figure 4 The detection terminal of the control module can be the ADC pin of the controller.

[0095] Please continue reading. Figure 4 The power path of the voltage conversion module also includes resistor R5. The current detection module includes resistor R6, capacitor C2, and operational amplifier U1. The first and second terminals of resistor R5 are the input terminals of the current detection module. The non-inverting input of operational amplifier U1 is connected to the first terminal of resistor R5, and the inverting input of operational amplifier U1 is connected to the second terminal of resistor R5. The output terminal of operational amplifier U1 is the output terminal of the current detection module. The inverting input of operational amplifier U1 is also connected to the first terminal of resistor R6, and the second terminal of resistor R6 is connected to the output terminal of operational amplifier U1. The inverting input of operational amplifier U1 is also connected to the first terminal of capacitor C2, and the second terminal of capacitor C2 is connected to the output terminal of operational amplifier U1.

[0096] The current detection module also includes resistors R7 and R8 for voltage division. The first end of resistor R7 is connected to the first end of resistor R5, and the second end of resistor R7 is connected to the non-inverting input of operational amplifier U1. The first end of resistor R8 is connected to the second end of resistor R5, and the second end of resistor R8 is connected to the inverting input of operational amplifier U1.

[0097] The current detection module may also include a resistor R9 and a capacitor C3. The first end of the resistor R9 is connected to the non-inverting input of the operational amplifier U1, and the second end of the resistor R9 is grounded. The first end of the capacitor C3 is connected to the non-inverting input of the operational amplifier U1, and the second end of the capacitor C3 is grounded.

[0098] It should be noted that, Figure 4 The example is in Figure 3 Based on this, in other embodiments, the current detection module and its corresponding connection relationships can be... Figure 2 This is based on the previous examples, and no limitations are imposed on it.

[0099] Figure 5 A schematic diagram of the power supply control circuit provided in the fifth embodiment is shown below. Figure 5 As shown, Figure 5 Compared to the example Figure 4The difference in the embodiment is that the protection terminal of the control module is also connected to the reset terminal of the pulse generation module.

[0100] The control module is also used to output a protection signal when the power supply control circuit enters the protection mode after the output trigger signal is detected; and to output a first boost pulse width modulation signal when the power supply control circuit does not enter the protection mode after the output trigger signal is detected. The pulse generation module is also used to terminate the output of the single pulse signal when the protection signal is received.

[0101] In this embodiment, the control module outputs a trigger signal to cause the pulse generation module to output a single pulse signal. Since the single pulse signal has a certain width, if the power supply control circuit is detected to enter the protection mode within this width, a protection signal is output so that the pulse generation module stops outputting the single pulse signal when it receives the protection signal, thereby protecting the power supply circuit.

[0102] For example, the detection that the power supply control circuit has entered protection mode can be determined by at least one of the following methods:

[0103] In a scenario where the load connected to the output of the power supply circuit is a battery, the control module detects that the power supply control circuit enters protection mode when it detects that the battery voltage has reached the full charge voltage of the battery.

[0104] In a scenario where the voltage source connected to the input terminal of the power supply circuit is a photovoltaic module, when the control module detects an abnormal voltage output from the photovoltaic module, it detects that the power supply control circuit has entered protection mode.

[0105] When the control module detects a power supply circuit fault, it detects that the power supply control circuit has entered protection mode.

[0106] For example, abnormal voltage output from a photovoltaic module can include an undervoltage state, an overvoltage state, or a voltage fluctuation exceeding a threshold. For example, power supply circuit faults can include overcurrent faults, short circuit faults, or device overheating faults.

[0107] For example, if the power supply control circuit is detected not to have entered protection mode when at least one of the following conditions is met, it can be determined by at least one of the following methods:

[0108] In a scenario where the load connected to the output of the power supply circuit is a battery, the control module detects that the battery voltage has not reached the full charge voltage.

[0109] In a scenario where the voltage source connected to the input terminal of the power supply circuit is a photovoltaic module, the control module detects that the voltage output by the photovoltaic module is normal.

[0110] The control module detected that the power supply circuit was not faulty.

[0111] When the power supply control circuit is detected to have entered protection mode, the voltage conversion module should not be in boost mode. Since the output time of the trigger signal is earlier than the time when the power supply control circuit is detected to have entered protection mode, the protection signal is output after the trigger signal is output and the power supply control circuit is detected to have entered protection mode, so as to terminate the output of the single pulse signal.

[0112] In the technical solution provided in this application embodiment, after outputting the trigger signal for the pulse generation module to output a single pulse signal, if the power supply control circuit is detected to enter the protection mode, a protection signal is output to cause the pulse generation module to terminate the output of the single pulse signal, thereby improving the reliability of the power supply circuit.

[0113] Continue reading Figure 5 The control module includes a controller, a resistor R10, and a transistor Q1. The controller also includes a GPIO_D pin, which is connected to the first end of the resistor R10. The second end of the resistor R10 is connected to the base of the transistor Q1. The emitter of the transistor Q1 is grounded, and the collector of the transistor Q1 is connected to the RESET pin of the monostable multivibrator.

[0114] When the controller detects that the power supply control circuit has entered protection mode, the GPIO_D pin outputs a high-level signal, transistor Q1 conducts, and pulls the RESET pin down to ground. When the RESET pin of the monostable multivibrator is low, a low-level signal is output, thus terminating the output of the single-pulse signal.

[0115] It should be noted that, Figure 5 The example is in Figure 4 Based on this, in some other embodiments, the feature that the protection terminal of the control module is also connected to the reset terminal of the pulse generation module can be... Figure 2 or Figure 3 This is based on the embodiments, and no limitations are imposed. In other embodiments, the power supply control circuit includes the features of a first diode D1 and a second diode D2 and their corresponding connection methods, and may also be implemented in... Figure 2 or Figure 3 This implementation is based on the previous examples and is not limited thereto.

[0116] Continue reading Figure 5 The power supply control circuit also includes a first diode D1 and a second diode D2; the modulation terminal of the control module is connected to the anode of the first diode D1, and the cathode of the first diode D1 is connected to the control terminal of the voltage conversion module; the output terminal of the pulse generation module is connected to the anode of the second diode D2, and the cathode of the second diode D2 is connected to the cathode of the first diode D1.

[0117] In the technical solution provided in this application embodiment, the unidirectional conduction characteristic of the diode can effectively isolate the crosstalk between the two signals, avoid signal backflow between the modulation end of the control module and the output end of the pulse generation module, ensure the independence and stability of the signal output from the modulation end of the control module and the signal output from the output end of the pulse generation module in their respective transmission paths, prevent signal interference from causing the control logic of the voltage conversion module to become disordered, and improve the power supply reliability of the power supply circuit.

[0118] Figure 6 A schematic diagram of the power supply control circuit provided in the sixth embodiment is shown below. Figure 6 As shown, Figure 6 Compared to the example Figure 5 The difference in the embodiment is that the voltage conversion module includes a first switch Q2, a second switch Q3, a third diode D3, a fourth diode D4, and an energy storage inductor L.

[0119] The first conducting terminal of the first switching transistor Q2 is connected to the input terminal of the power supply circuit, the control terminal of the first switching transistor Q2 is connected to the modulation terminal of the control module, the second conducting terminal of the first switching transistor Q2 is connected to the cathode of the third diode D3, and the anode of the third diode D3 is grounded.

[0120] The cathode of the fourth diode D4 is connected to the output terminal of the power supply circuit, the anode of the fourth diode D4 is connected to the first conducting terminal of the second switching transistor Q3, the second conducting terminal of the second switching transistor Q3 is grounded, and the control terminal of the second switching transistor Q3 is connected to the modulation terminal of the control module.

[0121] The cathode of the third diode D3 is also connected to the first terminal of the energy storage inductor L, and the second terminal of the energy storage inductor L is also connected to the anode of the fourth diode D4.

[0122] In this circuit, the branch connecting the first switch Q2 to the third diode D3 forms the step-down branch of the voltage conversion module. The branch connecting the second switch Q3 to the fourth diode D4 forms the step-up branch of the voltage conversion module.

[0123] The modulation terminal of the control module includes a first modulation terminal and a second modulation terminal. The control terminal of the first switch Q2 is connected to the first modulation terminal of the control module, and the control terminal of the second switch Q3 is connected to the second modulation terminal of the control module.

[0124] The following section, using the circuit structure of the voltage conversion module as an example, explains the working principle of the power supply control circuit:

[0125] When the voltage difference switches to the step-down region, the identification module outputs a step-down signal because the input voltage of the power supply circuit is high and the output voltage is low. Upon receiving this signal, the control module outputs a step-down pulse width modulation (PWM) signal, which includes a pulse signal sent to the first switch Q2 and a turn-off signal sent to the second switch Q3. The first switch Q2 is periodically turned on based on the pulse signal, and the second switch Q3 is turned off based on the turn-off signal. When the first switch Q2 is on, the voltage source connected to the input of the power supply circuit not only charges the energy storage inductor L but also supplies power to the load connected to the output of the power supply circuit. When the first switch Q2 is off, although the voltage source no longer charges the energy storage inductor L, the energy storage inductor L still stores electrical energy and supplies power to the load, thus enabling the voltage conversion module to operate in a continuous step-down state.

[0126] When the voltage difference switches to the boost region, the identification module outputs a boost signal because the input voltage of the power supply circuit is low and the output voltage is high. Upon receiving the boost signal, the control module outputs a second boost pulse width modulation signal, which includes a turn-on signal to the first switch Q2 and a pulse signal to the second switch Q3. The first switch Q2 is continuously turned on based on the turn-on signal, while the second switch Q3 is periodically turned on based on the pulse signal. When the second switch Q3 is on, the energy storage inductor L is short-circuited through Q3, and the voltage source charges the energy storage inductor L. The load is powered by the output capacitor. When the second switch Q3 is off, the voltage source and the energy storage inductor L jointly power the load, thus enabling the voltage conversion module to operate in a continuous boost state.

[0127] When the voltage difference switches from the boost region to the critical voltage region, if there is a delay between the switching time to the critical voltage region and the pulse signal corresponding to the critical voltage region output by the control module, the pulse signal corresponding to the critical voltage region is a first boost pulse width modulation signal, while the pulse signal corresponding to the boost region is a second boost pulse width modulation signal. Therefore, if the second switch Q3 still operates based on the second boost pulse width modulation signal during this delay time, it will cause a mismatch between the operation of the voltage conversion module and the state of the power supply circuit, reducing the power supply reliability of the power supply circuit.

[0128] Therefore, in this embodiment, when the voltage difference switches from the boost region to the critical voltage region, the identification module outputs a critical signal. When the control module receives the critical signal, it immediately outputs a turn-on signal to the first switch Q2 and a trigger signal to the pulse generation module. This causes the pulse generation module to output a single pulse signal when it receives the trigger signal. The width of the single pulse signal is the same as the pulse width of the first boost pulse width modulation signal corresponding to the critical voltage region, so that the voltage conversion module performs one boost cycle. At this time, the first boost pulse width modulation signal corresponding to the critical voltage region is also generated. The control module continues to output a turn-on signal to the first switch Q2 and the first boost pulse width modulation signal corresponding to the critical voltage region. Thus, when the voltage difference switches from the boost region to the critical voltage region, the voltage conversion module is controlled to work in the corresponding mode in a timely manner, improving the power supply reliability of the power supply circuit.

[0129] When the voltage difference switches from the step-down region to the critical voltage region, if there is a delay between the switching time to the critical voltage region and the pulse signal corresponding to the critical voltage region output by the control module, the first switch Q2 will still be periodically turned on and the second switch Q3 will be turned off during this delay. When the first switch Q2 is turned on, the voltage across the energy storage inductor L is close, so power cannot be supplied to the energy storage inductor L. As a result, the power at the input of the power supply circuit cannot be effectively transferred to the output of the power supply circuit, and the voltage source cannot supply power to the load normally, which reduces the power supply reliability of the power supply circuit.

[0130] Therefore, in this embodiment, when the voltage difference switches from the buck region to the critical voltage region, the identification module outputs a critical signal. When the control module receives the critical signal, it immediately outputs a turn-on signal to the first switch Q2 and a trigger signal to the pulse generation module. This causes the pulse generation module to output a single pulse signal when it receives the trigger signal. The width of the single pulse signal is the same as the pulse width of the first boost pulse width modulation signal corresponding to the critical voltage region, so that the voltage conversion module performs one boost cycle. At this time, the first boost pulse width modulation signal corresponding to the critical voltage region is also generated. The control module continues to output a turn-on signal to the first switch Q2 and the first boost pulse width modulation signal corresponding to the critical voltage region. Thus, when the voltage difference switches from the buck region to the critical voltage region, the voltage conversion module is controlled to work in the corresponding mode in a timely manner, improving the power supply reliability of the power supply circuit.

[0131] Figure 7 A schematic diagram of the power supply control circuit provided in the seventh embodiment is shown below. Figure 7 As shown, Figure 7 Compared to the example Figure 2The difference in the embodiments is that the identification module includes an amplification unit and a comparison unit; the first input terminal of the amplification unit is connected to the input terminal of the power supply circuit, the second input terminal of the amplification unit is connected to the output terminal of the power supply circuit, the output terminal of the amplification unit is connected to the input terminal of the comparison unit, and the output terminal of the comparison unit is connected to the input terminal of the control module.

[0132] The amplification unit amplifies the result of subtracting the output voltage and the forward voltage drop of the power supply circuit from the input voltage of the power supply circuit, and outputs an amplified voltage. The comparison unit outputs a critical signal when the absolute value of the received amplified voltage does not exceed a set voltage threshold.

[0133] In this embodiment, the voltage difference switching to the critical voltage region is determined by subtracting the output voltage of the power supply circuit from the input voltage of the power supply circuit, and then subtracting the on-state voltage drop of the power supply circuit. This takes the on-state voltage drop of the power supply circuit into account, avoiding the neglect of the on-state voltage drop in some cases. The voltage difference switching to the critical voltage region is determined based on the result of subtracting the output voltage of the power supply circuit from the input voltage of the power supply circuit. This allows the reference for switching the voltage difference to the critical voltage region to match the actual situation of the power supply circuit, improving the accuracy of the determined voltage difference switching to the critical voltage region.

[0134] Continue reading Figure 7 The amplification unit includes an input voltage sampling subunit, an output voltage sampling subunit, and a differential amplification subunit. The input terminal of the input voltage sampling subunit is connected to the input terminal of the power supply circuit, and the output terminal of the input voltage sampling subunit is connected to the first input terminal of the differential amplification subunit. The input terminal of the output voltage sampling subunit is connected to the output terminal of the power supply circuit, and the output terminal of the output voltage sampling subunit is connected to the second input terminal of the differential amplification subunit. The reference voltage of the differential amplification subunit is the inverse of the on-state voltage drop of the power supply circuit, and the output terminal of the differential amplification subunit is connected to the input terminal of the comparator unit.

[0135] The input voltage sampling subunit is used to sample and output the input voltage of the power supply circuit; the output voltage sampling subunit is used to sample and output the output voltage of the power supply circuit; the differential amplifier subunit is used to amplify the result of subtracting the output voltage of the power supply circuit from the input voltage of the power supply circuit and then subtracting the on-state voltage drop of the power supply circuit, and output the amplified voltage.

[0136] Continue reading Figure 7The input voltage sampling subunit includes resistors R11 and R12, operational amplifier U2, resistor R13, and capacitor C4. The input terminals of the input voltage sampling subunit include the first terminals of resistors R11 and R12. The first terminal of resistor R11 is connected to the positive terminal of the power supply circuit's input, and the second terminal of resistor R11 is connected to the non-inverting input of operational amplifier U2. The first terminal of resistor R12 is connected to the negative terminal of the power supply circuit's input, and the second terminal of resistor R12 is connected to the inverting input of operational amplifier U2. The output terminal of operational amplifier U2 is the output terminal of the input voltage sampling subunit. The inverting input of operational amplifier U2 is also connected to the first terminal of resistor R13, and the second terminal of resistor R13 is connected to the output terminal of operational amplifier U2. The inverting input of operational amplifier U2 is also connected to the first terminal of capacitor C4, and the second terminal of capacitor C4 is connected to the output terminal of operational amplifier U2.

[0137] The input voltage sampling subunit also includes a resistor R14 and a capacitor C5. The first end of the resistor R14 is connected to the non-inverting input of the operational amplifier U2, and the second end of the resistor R14 is grounded. The first end of the capacitor C5 is connected to the non-inverting input of the operational amplifier U2, and the second end of the capacitor C5 is grounded.

[0138] Continue reading Figure 7 The output voltage sampling subunit includes resistors R15 and R16, operational amplifier U3, resistor R17, and capacitor C6. The input terminals of the output voltage sampling subunit include the first terminals of resistors R15 and R16. The first terminal of resistor R15 is connected to the positive terminal of the power supply circuit's output, and the second terminal of resistor R15 is connected to the non-inverting input of operational amplifier U3. The first terminal of resistor R16 is connected to the negative terminal of the power supply circuit's output, and the second terminal of resistor R16 is connected to the inverting input of operational amplifier U3. The output terminal of operational amplifier U3 is the output terminal of the output voltage sampling subunit. The inverting input terminal of operational amplifier U3 is also connected to the first terminal of resistor R17, and the second terminal of resistor R17 is connected to the output terminal of operational amplifier U3. The inverting input terminal of operational amplifier U3 is also connected to the first terminal of capacitor C6, and the second terminal of capacitor C6 is connected to the output terminal of operational amplifier U3.

[0139] The output voltage sampling subunit also includes a resistor R18 and a capacitor C7. The first end of the resistor R18 is connected to the non-inverting output of the operational amplifier U3, and the second end of the resistor R18 is grounded. The first end of the capacitor C7 is connected to the non-inverting output of the operational amplifier U3, and the second end of the capacitor C7 is grounded.

[0140] Continue reading Figure 7The differential amplifier subunit includes resistors R19 and R20, differential amplifier U4, resistors R21 and R22, capacitors C8 and C9. The first terminal of resistor R19 is the first input terminal of the differential amplifier subunit, and the first terminal of resistor R20 is the second input terminal. The first terminal of resistor R19 is connected to the output terminal of the input voltage sampling subunit, and the second terminal of resistor R19 is connected to the non-inverting input terminal of differential amplifier U4. The first terminal of resistor R20 is connected to the output terminal of the output voltage sampling subunit, and the second terminal of resistor R20 is connected to the inverting input terminal of differential amplifier U4. The output terminal of differential amplifier U4 is the output terminal of the differential amplifier subunit.

[0141] The non-inverting input of differential amplifier U4 is also connected to the first terminal of resistor R21. The voltage across the second terminal of resistor R21 is the reference voltage -V_offset of the differential amplifier subunit, which is the inverse of the on-state voltage drop V_offset of the power supply circuit. The non-inverting input of differential amplifier U4 is also connected to the first terminal of capacitor C8. The voltage across the second terminal of capacitor C8 is the reference voltage -V_offset of the differential amplifier subunit.

[0142] The inverting input terminal of differential amplifier U4 is also connected to the first terminal of resistor R22, and the voltage at the second terminal of resistor R22 is also connected to the output terminal of differential amplifier U4. The inverting input terminal of differential amplifier U4 is also connected to the first terminal of capacitor C9, and the voltage at the second terminal of capacitor C9 is also connected to the output terminal of differential amplifier U4.

[0143] The result of subtracting the output voltage and the forward voltage drop of the power supply circuit from the input voltage of the power supply circuit is amplified, and the amplified output voltage is V_diff.

[0144] Continue reading Figure 7 The comparison unit includes a first comparator U5, a second comparator U6, and a resistor R23.

[0145] The first terminal of resistor R23 is the input terminal of the comparator unit. The second terminal of resistor R23 is connected to the inverting input terminal of the first comparator U5, and also to the inverting input terminal of the second comparator U6. The voltage at the non-inverting input terminal of the first comparator U5 is the negative of the set voltage threshold V_th, -V_th. The voltage at the non-inverting input terminal of the second comparator U6 is the set voltage threshold V_th. The output terminals of both the first comparator U5 and the second comparator U6 are connected to the control module. For example, see... Figures 3 to 7 In any embodiment, the output of the first comparator U5 is connected to the GPIO_B pin of the controller, and the output of the second comparator U6 is connected to the GPIO_A pin of the controller. For example, a voltage threshold is set to be greater than a preset voltage threshold.

[0146] The following combination Figure 6 and Figure 7 The working principle of the power supply control circuit in the embodiments of this application is explained as follows:

[0147] When the controller's GPIO_A pin receives a high level and the GPIO_B pin receives a low level, it indicates that the voltage difference between the input and output terminals of the power supply circuit is in the step-down region and does not trigger the monostable multivibrator. The controller's PWM1 pin outputs a step-down pulse width modulation signal, and the controller's PWM2 pin outputs a turn-off signal to drive the voltage conversion module into a continuous step-down operating state.

[0148] When the controller's GPIO_A pin receives a low level and the GPIO_B pin receives a high level, it indicates that the voltage difference between the input and output terminals of the power supply circuit is in the boost region and does not trigger the monostable multivibrator. The controller's PWM1 pin outputs a turn-on signal, and the controller's PWM2 pin outputs a second boost pulse width modulation signal to drive the voltage conversion module to be in a continuous boost operation state.

[0149] When the controller's GPIO_A and GPIO_B pins receive a low level, it indicates that the voltage difference between the input and output terminals of the power supply circuit is in the critical voltage region, immediately triggering the monostable multivibrator. The controller's PWM1 pin outputs a turn-on signal, and the controller's GPIO_C pin outputs a trigger signal, causing the monostable multivibrator to output a single pulse signal to drive the voltage conversion module to perform one boost cycle. After that, the controller's PWM2 pin outputs the first boost pulse width modulation signal to drive the voltage conversion module to a continuous boost operation state.

[0150] Figure 8 A circuit structure diagram of an energy storage system is provided for some embodiments, such as Figure 8 As shown, the energy storage system includes a voltage source, a load, and a power supply control circuit. The power supply control circuit includes a power supply circuit, an identification module, a control module, and a pulse generation module. The power supply circuit is equipped with a voltage conversion module. The first input terminal of the identification module is connected to the input terminal of the power supply circuit, the input terminal of the power supply circuit is connected to the voltage source, the second input terminal of the identification module is connected to the output terminal of the power supply circuit, the output terminal of the power supply circuit is connected to the load, the output terminal of the identification module is connected to the input terminal of the control module, the trigger signal output terminal of the control module is connected to the trigger terminal of the pulse generation module, and the modulation terminal of the control module and the output terminal of the pulse generation module are both connected to the control terminal of the voltage conversion module.

[0151] The identification module is used to output a critical signal when the voltage difference between the input and output terminals of the power supply circuit switches to the critical voltage region; the critical voltage region is between the boost region and the buck region; the control module is used to output a trigger signal when the critical signal is received, and output a first boost pulse width modulation signal after a preset time interval to drive the voltage conversion module to be in a continuous boost operation state; the pulse generation module is used to output a single pulse signal when the trigger signal is received to drive the voltage conversion module to perform one boost operation cycle; wherein, the time for outputting the first boost pulse width modulation signal is after the time for outputting the single pulse signal.

[0152] The description of the power supply control circuit in the energy storage system can be found in the previous embodiment, and will not be repeated here.

[0153] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0154] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A power supply control circuit, characterized in that, The power supply control circuit includes a power supply circuit, an identification module, a control module, and a pulse generation module. The power supply circuit includes a voltage conversion module. The first input terminal of the identification module is connected to the input terminal of the power supply circuit, the second input terminal of the identification module is connected to the output terminal of the power supply circuit, the output terminal of the identification module is connected to the input terminal of the control module, the trigger signal output terminal of the control module is connected to the trigger terminal of the pulse generation module, and both the modulation terminal of the control module and the output terminal of the pulse generation module are connected to the control terminal of the voltage conversion module. The identification module is used to output a critical signal when the voltage difference between the input and output terminals of the power supply circuit switches to the critical voltage region; the critical voltage region is between the boost region and the buck region. The control module is used to output a trigger signal when it receives the critical signal, and output a first boost pulse width modulation signal after a preset time interval, so as to drive the voltage conversion module to be in a continuous boost working state. The pulse generation module is used to output a single pulse signal when the trigger signal is received, so as to drive the voltage conversion module to perform one boost working cycle; wherein the time of outputting the first boost pulse width modulation signal is after the time of outputting the single pulse signal.

2. The power supply control circuit according to claim 1, characterized in that, The identification module is also configured to output a buck signal when the voltage difference switches to the buck region, and output a boost signal when the voltage difference switches to the boost region; The control module is further configured to output a buck pulse width modulation signal when receiving the buck signal, so as to drive the voltage conversion module to operate in a continuous buck state; and to output a second boost pulse width modulation signal when receiving the boost signal, so as to drive the voltage conversion module to operate in a continuous boost state.

3. The power supply control circuit according to claim 1, characterized in that, The critical voltage range is the range from the difference between the on-state voltage drop of the power supply circuit and the preset voltage threshold to the sum of the on-state voltage drop of the power supply circuit and the preset voltage threshold.

4. The power supply control circuit according to any one of claims 1-3, characterized in that, The power supply control circuit also includes a current detection module, the input terminal of which is connected to the power path of the voltage conversion module, and the output terminal of which is connected to the detection terminal of the control module. The current detection module is used to detect and output the current detection signal of the power path; The control module is further configured to output the first boost pulse width modulation signal when it detects that the current corresponding to the current detection signal exceeds a preset current threshold after outputting the trigger signal.

5. The power supply control circuit according to any one of claims 1-3, characterized in that, The protection terminal of the control module is also connected to the reset terminal of the pulse generation module; The control module is further configured to output a protection signal when it detects that the power supply control circuit has entered the protection mode after outputting the trigger signal; and to output the first boost pulse width modulation signal when it detects that the power supply control circuit has not entered the protection mode after outputting the trigger signal. The pulse generation module is also used to terminate the output of the single pulse signal when the protection signal is received.

6. The power supply control circuit according to any one of claims 1-3, characterized in that, The power supply control circuit also includes a first diode and a second diode; The modulation terminal of the control module is connected to the anode of the first diode, and the cathode of the first diode is connected to the control terminal of the voltage conversion module. The output terminal of the pulse generation module is connected to the anode of the second diode, and the cathode of the second diode is connected to the cathode of the first diode.

7. The power supply control circuit according to any one of claims 1-3, characterized in that, The voltage conversion module includes a first switching transistor, a second switching transistor, a third diode, a fourth diode, and an energy storage inductor; the modulation terminal of the control module includes a first modulation terminal and a second modulation terminal. The first conducting terminal of the first switching transistor is connected to the input terminal of the power supply circuit, the control terminal of the first switching transistor is connected to the first modulation terminal of the control module, the second conducting terminal of the first switching transistor is connected to the cathode of the third diode, and the anode of the third diode is grounded. The cathode of the fourth diode is connected to the output terminal of the power supply circuit, the anode of the fourth diode is connected to the first conducting terminal of the second switching transistor, the second conducting terminal of the second switching transistor is grounded, and the control terminal of the second switching transistor is connected to the second modulation terminal of the control module. The cathode of the third diode is also connected to the first terminal of the energy storage inductor, and the second terminal of the energy storage inductor is also connected to the anode of the fourth diode.

8. The power supply control circuit according to any one of claims 1-3, characterized in that, The identification module includes an amplification unit and a comparison unit; the first input terminal of the amplification unit is connected to the input terminal of the power supply circuit, the second input terminal of the amplification unit is connected to the output terminal of the power supply circuit, the output terminal of the amplification unit is connected to the input terminal of the comparison unit, and the output terminal of the comparison unit is connected to the input terminal of the control module. The amplification unit is used to amplify the result of subtracting the output voltage of the power supply circuit from the input voltage of the power supply circuit and then subtracting the on-state voltage drop of the power supply circuit, and output an amplified voltage. The comparison unit is used to output the critical signal when the absolute value of the received amplified voltage does not exceed a set voltage threshold.

9. The power supply control circuit according to claim 8, characterized in that, The amplification unit includes an input voltage sampling subunit, an output voltage sampling subunit, and a differential amplification subunit. The input terminal of the input voltage sampling subunit is connected to the input terminal of the power supply circuit, and the output terminal of the input voltage sampling subunit is connected to the first input terminal of the differential amplification subunit. The input terminal of the output voltage sampling subunit is connected to the output terminal of the power supply circuit, and the output terminal of the output voltage sampling subunit is connected to the second input terminal of the differential amplification subunit. The reference voltage of the differential amplification subunit is the opposite of the on-state voltage drop of the power supply circuit, and the output terminal of the differential amplification subunit is connected to the input terminal of the comparator unit. The input voltage sampling subunit is used to sample and output the input voltage of the power supply circuit; The output voltage sampling subunit is used to sample and output the output voltage of the power supply circuit; The differential amplifier subunit is used to amplify the result of subtracting the output voltage of the power supply circuit from the input voltage of the power supply circuit and then subtracting the on-state voltage drop of the power supply circuit, and output the amplified voltage.

10. An energy storage system, characterized in that, The energy storage system includes a voltage source, a load, and a power supply control circuit. The power supply control circuit includes a power supply circuit, an identification module, a control module, and a pulse generation module. The power supply circuit includes a voltage conversion module. The first input terminal of the identification module is connected to the input terminal of the power supply circuit, the input terminal of the power supply circuit is connected to the voltage source, the second input terminal of the identification module is connected to the output terminal of the power supply circuit, the output terminal of the power supply circuit is connected to the load, the output terminal of the identification module is connected to the input terminal of the control module, the trigger signal output terminal of the control module is connected to the trigger terminal of the pulse generation module, and both the modulation terminal of the control module and the output terminal of the pulse generation module are connected to the control terminal of the voltage conversion module. The identification module is used to output a critical signal when the voltage difference between the input and output terminals of the power supply circuit switches to the critical voltage region; the critical voltage region is between the boost region and the buck region. The control module is used to output a trigger signal when it receives the critical signal, and output a first boost pulse width modulation signal after a preset time interval, so as to drive the voltage conversion module to be in a continuous boost working state. The pulse generation module is used to output a single pulse signal when the trigger signal is received, so as to drive the voltage conversion module to perform one boost working cycle; wherein the time of outputting the first boost pulse width modulation signal is after the time of outputting the single pulse signal.

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