Power supply circuit and energy storage system

Abstract

The application provides a power supply circuit and an energy storage system, and relates to the technical field of power electronics. The power supply circuit comprises a starting circuit, a first end of the starting circuit being connected with a direct-current input source; a first switch, a first end of the first switch being connected with a second end of the starting circuit; a capacitive component, a first end of the capacitive component being connected with a second end of the first switch, and a second end of the capacitive component being grounded; a control chip, a power supply end of the control chip being connected with the second end of the first switch, and a first output end of the control chip being used for transmitting a driving signal to a control end of the first switch; and a transformer, a primary winding of the transformer being connected with the direct-current input source, and a secondary winding of the transformer being used for supplying power to a load. The application realizes that the starting circuit does not generate power consumption when the power supply circuit normally outputs, thereby improving the energy saving of the power supply.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power electronics, in particular to a power supply circuit and an energy storage system. BACKGROUND

[0002] With the development of new energy technology and energy storage field, a power supply circuit is needed for a system, and the main topology of the power supply circuit is a flyback power supply circuit.

[0003] In the related art, the power supply circuit needs to support power supply when the system is normally running, and the power supply circuit is in a live state for a long time when the system maintains output, such as Figure 4 In the related art, the voltage transmitted by the DC input source flows through the resistor component 401 and the unidirectional diode D45 as a starting circuit to the power supply pin 7 of the starting chip U2, and the circuit between the DC input source and the starting chip U2 is in a live state for a long time in the starting stage and the standby stage. Therefore, the power supply circuit in the related art has the problem of energy waste caused by the live state of the starting circuit. SUMMARY

[0004] The present application aims to solve the problem of energy waste caused by power consumption of the power supply circuit in the prior art or the related art.

[0005] To this end, a first aspect of the present application provides a power supply circuit.

[0006] A second aspect of the present application provides an energy storage system.

[0007] Therefore, according to the first aspect of the present application, a power supply circuit is provided, which comprises: a starting circuit, a first end of the starting circuit being connected to a DC input source; a first switch, a first end of the first switch being connected to a second end of the starting circuit; a capacitive component, a first end of the capacitive component being connected to a second end of the first switch, and a second end of the capacitive component being grounded; a control chip, a power supply end of the control chip being connected to the second end of the first switch, and a first output end of the control chip being used for transmitting a driving signal to a control end of the first switch, wherein the first switch is turned on when the driving signal is a first level signal, and the first switch is turned off when the driving signal is a second level signal; a transformer, a primary winding of the transformer being connected to the DC input source, and a secondary winding of the transformer being used for supplying power to a load, wherein a second output end of the control chip is used for controlling a conduction state between the primary winding of the transformer and the DC input source.

[0008] In this technical solution, the power supply circuit also includes a startup circuit. The startup circuit is connected between the output terminal of the DC input source and the first terminal of the first switch. The second terminal of the first switch is connected to the power supply terminal of the control chip through a capacitive component. The first output terminal of the control chip is electrically connected to the control terminal of the first switch. The first output terminal of the control chip can transmit a drive signal to the control terminal of the first switch. The drive signal is used to drive the on / off state of the first switch.

[0009] Specifically, the first switching element is a low-level conducting switching element. Initially, when the control chip is not powered on, the first switching element is in a conducting state. When the DC input source outputs voltage, the output voltage is transmitted to the first switching element through the startup circuit. The first switching element then transmits the voltage to the capacitive component to charge it. When the capacitive component is charged to the startup voltage of the control chip, the voltage at the power supply terminal of the control chip reaches the startup voltage, and the control chip begins operation. At this time, the control chip transmits a second-level driving signal to the first switching element through its first output terminal. The control terminal of the first switching element responds to the second-level driving signal and is cut off. At this time, the startup circuit is in a non-operating state.

[0010] It should be noted that the total capacitance of the capacitive components is set according to the operating time of the startup circuit, so that the time it takes for the capacitive components to be charged by the voltage output from the DC input source to reach the startup voltage matches the operating time of the startup circuit.

[0011] In this technical solution, the power supply circuit also includes a transformer, which comprises an iron core, a primary winding, and a secondary winding. There is at least one primary winding and at least one secondary winding. The on / off state between the primary winding of the transformer and the DC input source is controlled by a control chip; that is, the control chip can control whether the transformer is energized.

[0012] In this technical solution, a first switch and a capacitive component are arranged between the startup circuit and the control chip. The first switch is a switch that turns on in response to a first level signal and a second level signal. This allows the voltage output by the power supply circuit during the startup phase to charge the capacitive component through the conducting first switch. When the capacitive component is charged to the startup voltage of the control chip, the first output terminal of the control chip automatically transmits a drive signal of the second level signal to the control terminal of the first switch, thereby driving the first switch to turn off. This switches the startup circuit and the DC input source from the on state to the off state, ensuring that the startup circuit does not generate power consumption when the power supply circuit is in normal output mode, thus improving the energy efficiency of the power supply.

[0013] In some technical solutions, the power supply circuit may optionally include: a standby control circuit, wherein a first input terminal of the standby control circuit is connected to a first output terminal of the control chip, a second input terminal of the standby control circuit is used to receive a first control signal, and an output terminal of the standby control circuit is connected to a control terminal of a first switching device; wherein the standby control circuit is used to receive a second-level signal output by the control chip for energy storage, and outputs a second-level signal to the control terminal of the first switching device in response to the first control signal.

[0014] In this technical solution, the power supply circuit also includes a standby control circuit. When the power supply circuit is outputting normally, the standby control circuit stores energy through a supercapacitor or battery inside the standby control circuit. When the power supply circuit is in standby mode, the energy stored in the supercapacitor or battery is used to transmit a second-level signal to the control terminal of the first switch, so that the first switch is in the off state, ensuring that the startup circuit does not generate power consumption when the power supply circuit is in standby mode.

[0015] Specifically, the first input terminal of the standby control circuit receives the drive signal transmitted from the first output terminal of the control chip and stores the voltage of the drive signal in an internal supercapacitor or battery. The second input terminal of the standby control circuit receives a first control signal, which can be a signal transmitted from a host computer. This first control signal notifies the standby control circuit that it is in standby mode. At this time, the supercapacitor or battery inside the standby control circuit outputs a second-level drive signal. Since the output terminal of the standby control circuit is connected to the control terminal of the first switch, the standby control circuit can transmit the second-level drive signal to the control terminal of the first switch, thus putting the first switch in the off state.

[0016] It should be noted that when the power supply circuit exits the standby state, the host computer transmits a second control signal to the standby control circuit to notify the standby control circuit that the power supply circuit stops standby at this time, and the standby control circuit stops outputting the second level signal drive signal to the control terminal of the first switch.

[0017] In the technical solution of this application, a standby control circuit capable of energy storage is set in the power supply circuit. When the power supply circuit is outputting normally, the standby control circuit can store the electrical energy output by the control chip. Thus, when the power supply circuit is in standby mode, after the control chip is powered off, the standby control circuit can replace the control chip to output a drive signal as a second-level signal to the control terminal of the first switch, so that the power supply circuit can start the circuit without generating power consumption in standby mode, thereby realizing zero-power standby of the power supply circuit.

[0018] In some technical solutions, optionally, the standby control circuit includes: a first capacitor, the first end of which is electrically connected to the first output terminal of the control chip, and the second end of which is grounded; and a second switch, the first end of which is connected to the first end of the first capacitor, and the second end of which is connected to the control terminal of the first switch, the control terminal of which is used to receive a first control signal.

[0019] In this technical solution, the standby control circuit includes a first capacitor and a second switch. The two ends of the first capacitor are respectively connected between the first output terminal of the control chip and the ground terminal. The first capacitor is used to store the voltage of the drive signal received from the first output terminal of the control chip.

[0020] In this technical solution, the standby control circuit also includes a second switch, which is connected between the first terminal of the first capacitor and the control terminal of the first switch. The control terminal of the second switch responds to the first control signal to control the on / off state between the first capacitor and the control terminal of the first switch.

[0021] Specifically, the first terminal of the first capacitor is the first input terminal of the standby control circuit, the second terminal of the second switch is the output terminal of the standby control circuit, and the control terminal of the second switch is the second input terminal of the standby control circuit.

[0022] In the technical solution of this application, a first capacitor and a second switch are provided in the standby control circuit. The first capacitor can store energy for the drive signal output from the first output terminal of the control chip, and the second switch can control whether the first capacitor outputs a drive signal to the control terminal of the first switch. Thus, the standby control circuit can control the on / off state of the first switch when the power supply circuit is in standby mode, thereby realizing the zero-power standby function of the power supply circuit.

[0023] In some technical solutions, the standby control circuit may optionally include: a first diode, the anode of which is electrically connected to the first output terminal of the control chip, and the cathode of which is connected to the first terminal of the first capacitor; a first resistor, the first terminal of which is connected to the control terminal of the second switch; and a second resistor, the first terminal of which is connected to the second terminal of the first resistor, and the second terminal of the second resistor is used to receive the first control signal.

[0024] In this technical solution, the standby control circuit also includes a first diode, which is connected between the first output terminal of the control chip and the first terminal of the first capacitor, enabling unidirectional conduction between the first output terminal of the control chip and the first terminal of the first capacitor. When the first output terminal of the control chip outputs a second-level drive signal, the drive signal can be transmitted to the first capacitor for energy storage through the first diode, and the transmission to the first output terminal of the control chip is avoided when the first capacitor discharges, thus improving the operational stability of the standby control circuit.

[0025] In this technical solution, the standby control circuit is also provided with a first resistor and a second resistor. The first resistor and the second resistor are connected in series at the control terminal of the second switch. The first resistor and the second resistor are the driving resistors of the second switch. That is, the first control signal or the second control signal transmitted by the host computer is transmitted to the control terminal of the second switch through the first resistor and the second resistor, thereby controlling the on / off state of the second switch.

[0026] In the technical solution of this application, by setting a first diode between the first capacitor and the first output terminal of the control chip, and connecting a first resistor and a second resistor in series at the control terminal of the second switch, the operational stability of the standby control circuit is improved, enabling the standby control circuit to stably control the on / off state of the first switch in the standby state of the power supply circuit.

[0027] In some technical solutions, the power supply circuit may optionally include a second diode, the negative terminal of which is connected to the control terminal of the first switching element, the positive terminal of which is electrically connected to the first output terminal of the control chip, and the positive terminal of which is connected to the output terminal of the standby control circuit.

[0028] In this technical solution, the power supply circuit also includes a second diode disposed at the control terminal of the first switching device. The positive terminal of the second diode is used to receive the drive signal. That is, the positive terminal of the second diode is connected to the first output terminal of the control chip and the output terminal of the standby control circuit. The negative terminal of the second diode is connected to the control terminal of the first switching device. The second diode enables the drive signal transmitted to the first switching device to conduct unidirectionally.

[0029] In the technical solution of this application, a unidirectional second diode is connected to the control terminal of the first switch. When the power supply circuit is in a continuous output state, the drive signal output by the first output terminal of the control chip can be transmitted to the control terminal of the first switch through the second diode. When the power supply circuit is in a standby state, the drive signal output by the standby control circuit can also be transmitted to the control terminal of the first switch through the second diode, thereby improving the stability of controlling the on / off state of the first switch.

[0030] In some technical solutions, the power supply circuit may optionally include: a third resistor, the first end of which is connected to the first output terminal of the control chip, and the second end of which is connected to the first input terminal of the control chip; a second capacitor, the first end of which is connected to the second end of the third resistor, and the second end of the fifth capacitor is grounded; wherein the frequency of the driving signal is related to the resistance value of the third resistor and the capacitance value of the second capacitor.

[0031] In this technical solution, the first output terminal of the control chip is used to output the drive signal of the first switching device, and the third resistor and the second capacitor connected to the first input terminal of the control chip are used to determine the operating frequency of the control chip, that is, to determine the signal frequency of the drive signal output by the first control chip. By adjusting the resistance value of the third resistor and the capacitance value of the third capacitor in the power supply circuit, the signal frequency of the drive signal output by the control chip is adjusted.

[0032] In the technical solution of this application, by setting a third resistor and a second capacitor in the power supply circuit, and setting the third resistor and the second capacitor according to actual needs, the control chip can output a drive signal of the corresponding signal frequency.

[0033] In some technical solutions, the capacitive component optionally includes: at least two third capacitors, which are connected in parallel between the second terminal of the first switching element and the ground terminal.

[0034] In this technical solution, at least two third capacitors are connected in parallel, and the parallel third capacitors are connected between the second terminal of the first switch and the ground terminal. When the first switch is in the on state, the voltage output by the DC input source first charges the at least two third capacitors. After the voltage of the at least two third capacitors reaches the start-up voltage of the control chip, the control chip powers on and transmits a drive signal of the second level to the control terminal of the first switch to drive the first switch to turn off.

[0035] In the technical solution of this application, at least two third capacitors connected in parallel are provided in the capacitive component. During the initial power-on phase of the power supply circuit, at least two third capacitors connected in parallel need to be charged first. When the voltage of at least two third capacitors reaches the charging voltage of the control chip, the control chip starts to power on and transmits a drive signal of the second level signal to the first switching device. The at least two third capacitors connected in parallel enable the control chip to delay power-on and control the first switching device, thereby improving the stability of the power supply circuit startup.

[0036] In some technical solutions, the driving circuit optionally includes: at least two fourth resistors connected in series between the DC input source and the first terminal of the first switching element; wherein the total resistance value of the at least two fourth resistors ranges from 100KΩ to 200KΩ.

[0037] In this technical solution, the driving circuit includes at least two fourth resistors connected in series. The at least two fourth resistors are connected in series between the output terminal of the DC input terminal and the first terminal of the first switching device. That is, the voltage output by the DC input source needs to be transmitted to the first switching device through at least two fourth resistors.

[0038] It should be noted that the total resistance of the at least two fourth resistors ranges from 100KΩ to 200KΩ, which is smaller than the resistance of the resistors in the starting circuit in the prior art. During the operating period of the starting circuit, because the total resistance of the at least two fourth resistors in the starting circuit is small, the response is faster during high-voltage starting, and it can also meet the requirements for low-voltage starting.

[0039] In the technical solution of this application, the starting circuit is provided with at least two fourth resistors connected in series, and the total resistance value of the at least two fourth resistors is greater than or equal to 100KΩ and less than or equal to 200KΩ, so that the power supply can adapt to a wide input voltage range.

[0040] In some technical solutions, the power supply circuit may optionally include a fourth capacitor, the first end of which is connected to the first end of the primary winding of the transformer, and the second end of which is grounded.

[0041] In the technical solution of this application, the first end of the fourth capacitor is connected between the DC input source and the first end of the primary winding of the transformer, and the other end of the fourth capacitor is connected to the ground terminal. During the process of the voltage output by the DC input source being transmitted to the transformer, the fourth capacitor, as the input power source, can absorb the high-frequency spike pulses of the main power circuit and the input buffer energy, thereby further improving the stability of the power supply circuit operation.

[0042] In some technical solutions, the power supply circuit may optionally include: a third switch, the control terminal of the third switch being electrically connected to the second output terminal of the control chip, the first terminal of the third switch being connected to the second terminal of the primary winding of the transformer, and the second terminal of the third switch being grounded.

[0043] In this technical solution, the third switch is used to control whether the primary winding of the transformer is connected to the output terminal of the DC input source. Specifically, the control terminal of the third switch is connected to the second output terminal of the control chip. The second output terminal of the control chip is used to output a control signal to the third switch to control the on / off state of the first and second terminals of the third switch. The first terminal of the third switch is connected to the second terminal of the primary winding of the transformer, and the first terminal of the third switch is grounded. When the third switch is in the on state, the primary winding and the DC input source form a circuit, and the primary winding of the transformer is energized. When the third switch is in the off state, the circuit between the primary winding and the DC input source is broken, and the primary winding of the transformer is not energized.

[0044] It should be noted that the power supply terminal of the control chip is also connected to the secondary winding of the transformer, meaning that the voltage signal output from the secondary winding of the transformer can power the control chip. After the power supply circuit is started, the starting circuit is in a de-energized state, and at this time, the power supply for the control chip is provided by the secondary winding of the transformer.

[0045] In the technical solution of this application, a third switch controlled by a control chip is provided between the primary winding of the transformer and the grounding terminal, so that the controller chip can control whether the primary winding of the transformer is energized through the third switch.

[0046] In some technical solutions, the power supply circuit may optionally include: a fifth resistor, the first end of which is connected to the second output terminal of the control chip, and the second end of which is connected to the control terminal of the third switch; and a sixth resistor, the first end of which is connected to the control terminal of the third switch, and the second end of which is connected to the second terminal of the third switch.

[0047] In the technical solution of this application, the power supply circuit also includes a fifth resistor and a sixth resistor. The fifth resistor is connected between the second output terminal of the control chip and the control terminal of the third switch, and the sixth resistor is connected between the control terminal of the third switch and the ground terminal. The fifth resistor and the sixth resistor are the driving resistors of the third switch. By setting the fifth resistor and the sixth resistor, the driving stability of the third switch can be guaranteed.

[0048] In some technical solutions, the power supply circuit may optionally include a current sampling circuit, wherein the sampling terminal of the current sampling circuit is connected to the second terminal of the third switching device, and the output terminal of the current sampling circuit is connected to the second input terminal of the control chip.

[0049] In the technical solution of this application, a current sampling circuit is set in the power supply circuit, and the sampling terminal of the current sampling circuit is connected between the third switch and the ground terminal. The output terminal of the current sampling circuit is connected to the second input terminal of the control chip, so that the control chip can continuously monitor the overcurrent value of the primary winding of the transformer.

[0050] In some technical solutions, the current sampling circuit may optionally include: a seventh resistor, the first end of which is connected to the second input terminal of the control chip, and the second end of which is connected to the second terminal of the third switch; an eighth resistor, the first end of which is connected to the second terminal of the third switch, and the second end of which is grounded; and a fifth capacitor, the first end of which is connected to the first end of the seventh resistor, and the second end of which is grounded.

[0051] In this technical solution, the current sampling circuit includes an eighth resistor as a sampling resistor, and a seventh resistor and a fifth capacitor forming an RC (resistor-capacitor) filter circuit. The current sampling signal is acquired at the eighth resistor, filtered by the RC filter circuit composed of the seventh resistor and the fifth capacitor, and then transmitted to the second output terminal of the control chip, thus completing the current sampling. Specifically, the common terminal of the seventh and eighth resistors is the sampling terminal of the current sampling circuit, and the common terminal of the seventh resistor and the fifth capacitor is the output terminal of the current sampling circuit.

[0052] In the technical solution of this application, an eighth resistor for sampling, a seventh resistor and a fifth capacitor for filtering are set in the current sampling circuit, which improves the accuracy of the control chip in acquiring the current sampling signal.

[0053] In some technical solutions, the power supply circuit may optionally include a voltage sampling circuit, the sampling terminal of which is connected to the secondary winding of the transformer, and the output terminal of which is connected to the third input terminal of the control chip.

[0054] In the technical solution of this application, a voltage sampling circuit is also provided in the power supply circuit. The sampling terminal of the voltage sampling circuit is connected to the secondary winding of the transformer, so as to sample the output voltage value of the transformer and enable the control chip to monitor the output voltage of the transformer.

[0055] According to the second aspect of this application, an energy storage system is proposed, comprising: a battery pack, and a power supply circuit as described in any of the above technical solutions, thus possessing all the beneficial technical effects of the power supply circuit in any of the above technical solutions, which will not be elaborated here.

[0056] Additional aspects and advantages of this application will become apparent in the following description or may be learned by practice of this application. Attached Figure Description

[0057] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0058] Figure 1 This illustration shows one of the circuit topologies of a power supply circuit provided in some embodiments of this application;

[0059] Figure 2 This is a second circuit topology diagram of a power supply circuit provided in some embodiments of this application;

[0060] Figure 3 The present application provides a structural block diagram of an energy storage system in some embodiments;

[0061] Figure 4 The circuit topology diagram of the power supply circuit in the related art is shown.

[0062] Figure 1 , Figure 2 and Figure 4 The accompanying figure labels are as follows:

[0063] 100 Power supply circuit, 101 Start-up circuit, 102 Capacitive component, 103 Transformer, 104 Standby control circuit, 105 Current sampling circuit, 106 Voltage sampling circuit, Input DC input source, Q1 First switch, Q2 Second switch, Q3 Third switch, U1 Control chip, TX core, 1031 Primary winding, 1032 Secondary winding, C1 First capacitor, C2 Second capacitor, C3 Third capacitor, C4 Fourth capacitor, C5 Fifth capacitor, C6 Sixth capacitor, D1 First diode, D2 Second diode, D3 Third diode, D4 ​​Fourth diode, R1 First resistor, R2 Second resistor, R3 Third resistor, R4 Fourth resistor, R5 Fifth resistor, R6 Sixth resistor, R7 Seventh resistor, R8 Eighth resistor, R9 Ninth resistor, R10 Tenth resistor, R11 Eleventh resistor, R12 Twelfth resistor, U2 Start-up chip, 401 Resistor assembly, D45 Unidirectional diode. Detailed Implementation

[0064] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, these embodiments and the features described herein can be combined with each other.

[0065] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0066] The following reference Figures 1 to 3 This application describes a power supply circuit and an energy storage system according to some embodiments.

[0067] According to one embodiment of this application, Figure 1 This illustration shows one of the circuit topologies of a power supply circuit provided in some embodiments of this application. Figure 2 This is a second example of a circuit topology diagram of a power supply circuit provided in some embodiments of this application, such as... Figure 1 and Figure 2 As shown, a power supply circuit 100 is proposed, including: a startup circuit 101, a capacitive component 102, a control chip U1, a transformer 103, and a first switching component Q1. The first terminal of the starting circuit 101 is connected to the DC input source Input; the first terminal of the first switch Q1 is connected to the second terminal of the starting circuit 101; the first terminal of the capacitive component 102 is connected to the second terminal of the first switch Q1, and the second terminal of the capacitive component 102 is grounded; the power supply terminal of the control chip U1 is connected to the second terminal of the first switch Q1, and the first output terminal of the control chip U1 is used to transmit a drive signal to the control terminal of the first switch Q1, wherein the first switch Q1 is turned on when the drive signal is a first level signal, and the first switch Q1 is turned off when the drive signal is a second level signal; the primary winding 1031 of the transformer 103 is connected to the DC input source Input, and the secondary winding 1032 of the transformer 103 is used to supply power to the load, wherein the second output terminal of the control chip U1 is used to control the on / off state between the primary winding 1031 of the transformer 103 and the DC input source Input.

[0068] In this embodiment, the power supply circuit 100 further includes a startup circuit 101, which is connected between the output terminal of the DC input source Input and the first terminal of the first switch Q1. The second terminal of the first switch Q1 is connected to the power supply terminal of the control chip U1 through a capacitive component 102. The first output terminal of the control chip U1 is electrically connected to the control terminal of the first switch Q1. The first output terminal of the control chip U1 can transmit a drive signal to the control terminal of the first switch Q1. The drive signal is used to drive the on / off state of the first switch Q1.

[0069] like Figure 1 As shown, for example, the power supply terminal of the control chip U1 is pin 8, pin 8 is the power supply pin of the control chip U1, the first output terminal of the control chip U1 is pin 1, and the second output terminal of the control chip U1 is pin 7.

[0070] For example, the first level signal is a low level signal, the second level signal is a high level signal, and the first switch Q1 is a switch that is turned on at low level and turned off at high level.

[0071] Specifically, the first switch Q1 is a low-level conducting switch. Initially, the control chip U1 is not powered on, so the first switch Q1 is in the conducting state. When the DC input source outputs voltage, the output voltage is transmitted to the first switch Q1 through the startup circuit 101. The first switch Q1 transmits the voltage to the capacitive component 102 to charge it. When the capacitive component 102 is charged to the startup voltage of the control chip U1, the voltage at the power supply terminal of the control chip U1 reaches the startup voltage, and the control chip U1 starts operating. At this time, the control chip U1 transmits a second-level driving signal to the first switch Q1 through its first output terminal. The control terminal of the first switch Q1 responds to the second-level driving signal and is cut off. At this time, the startup circuit 101 is in a non-operating state.

[0072] For example, Figure 1 The Soft charge is the driving signal.

[0073] For example, the first switching element Q1 is a PNP type switching transistor.

[0074] For example, the high-level drive signal transmitted by the control chip U1 to the first switch Q1 is a 5V signal.

[0075] It should be noted that the total capacitance of the capacitive component 102 is set according to the operating time of the startup circuit 101, so that the time it takes for the capacitive component 102 to be charged by the voltage output by the DC input source Input to reach the startup voltage matches the operating time of the startup circuit 101.

[0076] In this embodiment, the power supply circuit 100 further includes a transformer 103, which includes an iron core TX, a primary winding 1031, and a secondary winding 1032. The number of primary windings 1031 and secondary windings 1032 is at least one. The on / off state between the primary winding 1031 of the transformer 103 and the DC input source Input is controlled by a control chip U1, meaning the control chip U1 can control whether the transformer 103 is energized.

[0077] For example, the first level signal is a high level signal, the second level signal is a low level signal, and the first switch Q1 is a switch that is turned on at a high level and turned off at a low level.

[0078] like Figure 1 As shown, exemplarily, the primary winding 1031 consists of two windings connected in series, namely winding N1 and winding N2, and the secondary winding 1032 consists of three windings, namely winding N3, winding N4 and winding N5.

[0079] It should be noted that, as Figure 4 As shown, in the related technology, there is no circuit structure that can control the on / off state between the resistor component 401 and the startup chip U2. Therefore, regardless of whether the power supply circuit is in standby or running state, the circuit such as the resistor component 401 located between the startup chip U2 and the DC input source Input remains energized. Since the resistance value in the resistor component 401 is large, power consumption is generated, which affects the energy efficiency of the power supply circuit.

[0080] In this embodiment, by setting a first switch Q1 and a capacitive component 102 between the startup circuit 101 and the control chip U1, and the first switch Q1 being a switch that turns on and off in response to a first level signal and a second level signal, the voltage output by the power supply circuit 100 during the startup phase can charge the capacitive component 102 through the conducting first switch Q1. When the capacitive component 102 is charged to the startup voltage of the control chip U1, the first output terminal of the control chip U1 automatically transmits a drive signal of the second level signal to the control terminal of the first switch Q1, thereby driving the first switch Q1 to turn off, so that the startup circuit 101 and the DC input source Input switch from the on state to the off state. This achieves that the startup circuit 101 does not generate power consumption when the power supply circuit 100 is outputting normally, thereby improving the energy efficiency of the power supply circuit 100.

[0081] In some embodiments, the power supply circuit 100 may optionally include: a standby control circuit 104, wherein a first input terminal of the standby control circuit 104 is connected to a first output terminal of the control chip U1, a second input terminal of the standby control circuit 104 is used to receive a first control signal, and an output terminal of the standby control circuit 104 is connected to a control terminal of the first switch Q1; wherein the standby control circuit 104 is used to receive a second level signal output by the control chip U1 for energy storage, and outputs a second level signal to the control terminal of the first switch Q1 in response to the first control signal.

[0082] In this embodiment, the power supply circuit 100 further includes a standby control circuit 104. When the power supply circuit 100 is outputting normally, the standby control circuit 104 stores energy through a supercapacitor or battery inside the standby control circuit 104. When the power supply circuit 100 is in standby mode, the energy stored in the supercapacitor or battery is used to transmit a second level signal to the control terminal of the first switch Q1, so that the first switch Q1 is in the off state, ensuring that the startup circuit 101 does not generate power consumption when the power supply circuit 100 is in standby mode.

[0083] Specifically, the first input terminal of the standby control circuit 104 is used to receive the drive signal transmitted from the first output terminal of the control chip U1, and stores the voltage of the drive signal in an internal supercapacitor or battery. The second input terminal of the standby control circuit 104 is used to receive a first control signal, which can be a signal transmitted from a host computer. This first control signal is used to notify the standby control circuit 104 that it is in standby mode. At this time, the supercapacitor or battery inside the standby control circuit 104 outputs a drive signal of the second level. Since the output terminal of the standby control circuit 104 is connected to the control terminal of the first switch Q1, the standby control circuit 104 can transmit the drive signal of the second level to the control terminal of the first switch Q1 in place of the control chip U1, so that the first switch Q1 is in the off state.

[0084] It should be noted that when the power supply circuit 100 exits the standby state, the host computer transmits a second control signal to the standby control circuit 104 to notify the standby control circuit 104 that the power supply circuit 100 stops standby at this time, and the standby control circuit 104 stops outputting the drive signal of the second level signal to the control terminal of the first switch Q1.

[0085] In this embodiment, a standby control circuit 104 capable of storing energy is provided in the power supply circuit 100. When the power supply circuit 100 is outputting normally, the standby control circuit 104 can store the electrical energy output by the control chip U1. Thus, when the power supply circuit 100 is in standby mode, after the control chip U1 is powered off, the standby control circuit 104 can replace the control chip U1 to output a drive signal as a second-level signal to the control terminal of the first switch Q1, so that the power supply circuit 100 can start the circuit 101 without generating power consumption in standby mode, thereby realizing zero-power standby of the power supply circuit 100.

[0086] In some embodiments, the standby control circuit 104 optionally includes: a first capacitor C1 and a second switch Q2. The first terminal of the first capacitor C1 is electrically connected to the first output terminal of the control chip U1, and the second terminal of the first capacitor C1 is grounded; the first terminal of the second switch Q2 is connected to the first terminal of the first capacitor C1, and the second terminal of the second switch Q2 is connected to the control terminal of the first switch Q1, and the control terminal of the second switch Q2 is used to receive a first control signal.

[0087] In this embodiment, the standby control circuit 104 includes a first capacitor C1 and a second switch Q2. The two ends of the first capacitor C1 are respectively connected between the first output terminal of the control chip U1 and the ground terminal. The first capacitor C1 is used to store the voltage of the drive signal output by the first output terminal of the control chip U1.

[0088] For example, the first capacitor C1 may be a supercapacitor or an energy storage battery.

[0089] In this embodiment, the standby control circuit 104 further includes a second switch Q2, which is connected between the first terminal of the first capacitor C1 and the control terminal of the first switch Q1. The control terminal of the second switch Q2 responds to the first control signal to control the on / off state between the first capacitor C1 and the control terminal of the first switch Q1.

[0090] Specifically, the first terminal of the first capacitor C1 is the first input terminal of the standby control circuit 104, the second terminal of the second switch Q2 is the output terminal of the standby control circuit 104, and the control terminal of the second switch Q2 is the second input terminal of the standby control circuit 104.

[0091] For example, the second switching element Q2 can be selected as a high-level conducting switch or a low-level conducting switch. Specifically, for example, the second switching element Q2 can be selected as a PNP type switching transistor or an NPN type switching transistor.

[0092] In this embodiment, a first capacitor C1 and a second switch Q2 capable of storing energy are provided in the standby control circuit 104. The first capacitor C1 can store energy for the drive signal output from the first output terminal of the control chip U1, and the second switch Q2 can control whether the first capacitor C1 outputs a drive signal to the control terminal of the first switch Q1. Thus, the standby control circuit 104 can control the on / off state of the first switch Q1 when the power supply circuit 100 is in standby mode, thereby realizing the zero-power standby function of the power supply circuit 100.

[0093] In some embodiments, the standby control circuit 104 may optionally include: a first diode D1, a first resistor R1, and a second resistor R2. The anode of the first diode D1 is electrically connected to the first output terminal of the control chip U1, and the cathode of the first diode D1 is connected to the first terminal of the first capacitor C1; the first terminal of the first resistor R1 is connected to the control terminal of the second switch Q2; the first terminal of the second resistor R2 is connected to the second terminal of the first resistor R1, and the second terminal of the second resistor R2 is used to receive the first control signal.

[0094] In this embodiment, the standby control circuit 104 further includes a first diode D1, which is connected between the first output terminal of the control chip U1 and the first terminal of the first capacitor C1, enabling unidirectional conduction between the first output terminal of the control chip U1 and the first terminal of the first capacitor C1. When the first output terminal of the control chip U1 outputs a drive signal of the second level, the drive signal can be transmitted to the first capacitor C1 through the first diode D1 for energy storage, and the transmission to the first output terminal of the control chip U1 is avoided when the first capacitor C1 discharges, thus improving the operational stability of the standby control circuit 104.

[0095] In this embodiment, the standby control circuit 104 is further provided with a first resistor R1 and a second resistor R2. The first resistor R1 and the second resistor R2 are connected in series with the control terminal of the second switch Q2. The first resistor R1 and the second resistor R2 are the driving resistors of the second switch Q2. That is, the first control signal or the second control signal transmitted by the host computer is transmitted to the control terminal of the second switch Q2 through the first resistor R1 and the second resistor R2, thereby controlling the on / off state of the second switch Q2.

[0096] In this embodiment, by setting a first diode D1 between the first capacitor C1 and the first output terminal of the control chip U1, and connecting a first resistor R1 and a second resistor R2 in series at the control terminal of the second switch Q2, the operational stability of the standby control circuit 104 is improved, enabling the standby control circuit 104 to stably control the on / off state of the first switch Q1 in the standby state of the power supply circuit 100.

[0097] In some embodiments, the power supply circuit 100 may optionally include: a second diode D2, the negative terminal of the second diode D2 being connected to the control terminal of the first switch Q1, the positive terminal of the second diode D2 being electrically connected to the first output terminal of the control chip U1, and the positive terminal of the second diode D2 being connected to the output terminal of the standby control circuit 104.

[0098] In this embodiment, the power supply circuit 100 further includes a second diode D2 disposed at the control terminal of the first switch Q1. The anode of the second diode D2 is used to receive the drive signal, that is, the anode of the second diode D2 is connected to the first output terminal of the control chip U1 and the output terminal of the standby control circuit 104. The cathode of the second diode D2 is connected to the control terminal of the first switch Q1. The second diode D2 enables the drive signal transmitted to the first switch Q1 to conduct unidirectionally.

[0099] In this embodiment, a unidirectional second diode D2 is connected to the control terminal of the first switch Q1. When the power supply circuit 100 is in a continuous output state, the drive signal output by the first output terminal of the control chip U1 can be transmitted to the control terminal of the first switch Q1 through the second diode D2. When the power supply circuit 100 is in a standby state, the drive signal output by the standby control circuit 104 can also be transmitted to the control terminal of the first switch Q1 through the second diode D2, thereby improving the stability of controlling the on / off state of the first switch Q1.

[0100] In some embodiments, the power supply circuit 100 may optionally include: a third resistor R3 and a second capacitor C2. The first end of the third resistor R3 is connected to the first output terminal of the control chip U1, and the second end of the third resistor R3 is connected to the first input terminal of the control chip U1; the second capacitor C2 has its first end connected to the second end of the third resistor R3, and its second end grounded; wherein the frequency of the driving signal is related to the resistance value of the third resistor R3 and the capacitance value of the second capacitor C2.

[0101] In this embodiment, the first output terminal of the control chip U1 is used to output the drive signal of the first switching device Q1. The third resistor R3 and the second capacitor C2 connected to the first input terminal of the control chip U1 are used to determine the operating frequency of the control chip U1, that is, to determine the signal frequency of the drive signal output by the first control chip U1. By adjusting the resistance value of the third resistor R3 and the capacitance value of the third capacitor C3 in the power supply circuit 100, the signal frequency of the drive signal output by the control chip U1 is adjusted.

[0102] like Figure 1 As shown, pin 2 of control chip U1 is the first input terminal of control chip U1, pin 1 is the first output terminal of control chip U1, the third resistor R3 is connected between pin 1 and pin 2, and the second capacitor C2 is connected between pin 2 and the ground terminal.

[0103] In this embodiment, by setting a third resistor R3 and a second capacitor C2 in the power supply circuit 100, and setting the third resistor R3 and the second capacitor C2 according to actual needs, the control chip U1 can output a drive signal of the corresponding signal frequency.

[0104] In some embodiments, the capacitive component 102 may optionally include at least two third capacitors C3 connected in parallel between the second terminal of the first switch Q1 and the ground terminal.

[0105] In this embodiment, at least two third capacitors C3 are connected in parallel, and the parallel third capacitors C3 are connected between the second terminal of the first switch Q1 and the ground terminal. When the first switch Q1 is in the on state, the voltage output by the DC input source Input first charges the at least two third capacitors C3. After the voltage of the at least two third capacitors C3 reaches the start-up voltage of the control chip U1, the control chip U1 powers on and transmits a drive signal of the second level to the control terminal of the first switch Q1 to drive the first switch Q1 to turn off.

[0106] like Figure 1 As shown, exemplarily, at least two third capacitors C3 include an electrolytic capacitor and at least two filter capacitors. The electrolytic capacitor is connected in series between the second terminal of the first switch Q1 and the ground terminal, and at least two filter capacitors are connected in parallel with the electrolytic capacitor. The common terminal of the electrolytic capacitor and the first switch Q1 is connected to pin 8 of the control chip U1.

[0107] In this embodiment, at least two parallel third capacitors C3 are provided in the capacitive component 102. During the initial power-on phase of the power supply circuit 100, the at least two parallel third capacitors C3 need to be charged first. When the voltage of the at least two third capacitors C3 reaches the charging voltage of the control chip U1, the control chip U1 starts to power on and transmits a second-level signal to the first switch Q1. The at least two parallel third capacitors C3 enable the control chip U1 to delay power-on and control the first switch Q1, thereby improving the stability of the power supply circuit 100 startup.

[0108] In some embodiments, the driving circuit optionally includes: at least two fourth resistors R4, which are connected in series between the DC input source Input and the first terminal of the first switch Q1; wherein the total resistance of the at least two fourth resistors R4 ranges from 100KΩ to 200KΩ.

[0109] In this embodiment, the driving circuit includes at least two fourth resistors R4 connected in series. The at least two fourth resistors R4 are connected in series between the output terminal of the DC input terminal and the first terminal of the first switch Q1. That is, the voltage output by the DC input source Input needs to be transmitted to the first switch Q1 through at least two fourth resistors R4.

[0110] It should be noted that the total resistance of at least two fourth resistors R4 ranges from 100KΩ to 200KΩ, which is smaller than the resistance of the resistors in the starting circuit 101 in the prior art. During the operating period of the starting circuit 101, because the total resistance of at least two fourth resistors R4 in the starting circuit 101 is smaller, the response is faster during high-voltage starting and the requirements for low-voltage starting can be met.

[0111] For example, the total resistance of at least two fourth resistors R4 is selected to be 100KΩ.

[0112] In this embodiment of the application, the startup circuit 101 is provided with at least two fourth resistors R4 connected in series, and the total resistance value of the at least two fourth resistors R4 is greater than or equal to 100KΩ and less than or equal to 200KΩ, so that the power supply can adapt to a wide input voltage range.

[0113] In some embodiments, the power supply circuit 100 may optionally include a fourth capacitor C4, the first end of which is connected to the first end of the primary winding 1031 of the transformer 103, and the second end of which is grounded.

[0114] In this embodiment, the first end of the fourth capacitor C4 is connected between the DC input source Input and the first end of the primary winding 1031 of the transformer 103, and the other end of the fourth capacitor C4 is connected to the ground terminal. During the process of the voltage output by the DC input source Input being transmitted to the transformer 103, the fourth capacitor C4, as the input power source, can absorb the high-frequency spike pulses of the main power circuit and the input buffer energy, further improving the stability of the power supply circuit 100.

[0115] In some embodiments, the power supply circuit 100 may optionally include a third switch Q3, the control terminal of the third switch Q3 being electrically connected to the second output terminal of the control chip U1, the first terminal of the third switch Q3 being connected to the second terminal of the primary winding 1031 of the transformer 103, and the second terminal of the third switch Q3 being grounded.

[0116] In this embodiment, the third switch Q3 is used to control whether the primary winding 1031 of the transformer 103 is connected to the output terminal of the DC input source Input. Specifically, the control terminal of the third switch Q3 is connected to the second output terminal of the control chip U1. The second output terminal of the control chip U1 is used to output a control signal to the third switch Q3 to control the on / off state of the first and second terminals of the third switch Q3. The first terminal of the third switch Q3 is connected to the second terminal of the primary winding 1031 of the transformer 103. The first terminal of the third switch Q3 is grounded, that is, when the third switch Q3 is in the on state, the primary winding 1031 and the DC input source Input form a circuit, and the primary winding 1031 of the transformer 103 is energized. When the third switch Q3 is in the off state, the circuit between the primary winding 1031 and the DC input source Input is broken, and the primary winding 1031 of the transformer 103 is in the off state.

[0117] like Figure 1As shown, by way of example, the third switch Q3 is selected as a MOS (Metal-Oxide-Semiconductor) switch. The drain (D) terminal of the MOS switch is connected to the second terminal line of the primary winding 1031 of the transformer 103. The source (S) terminal of the MOS switch is grounded, and the gate (G) terminal of the MOS switch is connected to pin 7 of the control chip U1.

[0118] It should be noted that the power supply terminal of the control chip U1 is also connected to the secondary winding 1032 of the transformer 103, meaning that the voltage signal output from the secondary winding 1032 of the transformer 103 can power the control chip U1. After the power supply circuit 100 is started, the starting circuit 101 is in a de-energized state. At this time, the power supply of the control chip U1 is provided by the secondary winding 1032 of the transformer 103.

[0119] like Figure 1 As shown, exemplarily, the +12V power supply signal output by the secondary winding 1032 is transmitted to pin 8 of the control chip U1 through the third diode D3 to power the control chip U1. The output terminal of the secondary winding 1032 is connected to two parallel fourth diodes D4. The anodes of both fourth diodes D4 are connected to the secondary winding 1032, and the cathodes of both fourth diodes D4 are used to output the +12V power supply signal. A sixth capacitor C6 is connected between the second terminals of the two fourth diodes D4 and the ground terminal.

[0120] In this embodiment of the application, a third switch Q3 controlled by the control chip U1 is provided between the primary winding 1031 of the transformer 103 and the ground terminal, so that the controller chip can control whether the primary winding 1031 of the transformer 103 is powered on through the third switch Q3.

[0121] In some embodiments, the power supply circuit 100 may optionally include a fifth resistor R5 and a sixth resistor R6. The first end of the fifth resistor R5 is connected to the second output terminal of the control chip U1, and the second end of the fifth resistor R5 is connected to the control terminal of the third switch Q3; the first end of the sixth resistor R6 is connected to the control terminal of the third switch Q3, and the second end of the sixth resistor R6 is connected to the second end of the third switch Q3.

[0122] In this embodiment, the power supply circuit 100 further includes a fifth resistor R5 and a sixth resistor R6. The fifth resistor R5 is connected between the second output terminal of the control chip U1 and the control terminal of the third switch Q3, and the sixth resistor R6 is connected between the control terminal of the third switch Q3 and the ground terminal. The fifth resistor R5 and the sixth resistor R6 are the driving resistors of the third switch Q3. By setting the fifth resistor R5 and the sixth resistor R6, the driving stability of the third switch Q3 can be guaranteed.

[0123] In some embodiments, the power supply circuit 100 may optionally include a current sampling circuit 105, wherein the sampling terminal of the current sampling circuit 105 is connected to the second terminal of the third switch Q3, and the output terminal of the current sampling circuit 105 is connected to the second input terminal of the control chip U1.

[0124] In this embodiment of the application, a current sampling circuit 105 is provided in the power supply circuit 100, and the sampling terminal of the current sampling circuit 105 is connected between the third switch Q3 and the ground terminal. The output terminal of the current sampling circuit 105 is connected to the second input terminal of the control chip U1, so that the control chip U1 can continuously monitor the current value of the primary winding 1031 of the transformer 103 for overcurrent.

[0125] In some embodiments, the current sampling circuit 105 optionally includes: a seventh resistor R7, an eighth resistor R8, and a fifth capacitor C5. The first terminal of the seventh resistor R7 is connected to the second input terminal of the control chip U1, and the second terminal of the seventh resistor R7 is connected to the second terminal of the third switch Q3; the first terminal of the eighth resistor R8 is connected to the second terminal of the third switch Q3, and the second terminal of the eighth resistor R8 is grounded; the first terminal of the fifth capacitor C5 is connected to the first terminal of the seventh resistor R7, and the second terminal of the fifth capacitor C5 is grounded.

[0126] In this embodiment, the current sampling circuit 105 includes an eighth resistor R8 as a sampling resistor, and a seventh resistor R7 and a fifth capacitor C5 forming an RC (resistor-capacitor) filter circuit. The current sampling signal at the eighth resistor R8 is collected, filtered by the RC filter circuit composed of the seventh resistor R7 and the fifth capacitor C5, and then transmitted to the second output terminal of the control chip U1, thus completing the current sampling. Specifically, the common terminal of the seventh resistor R7 and the eighth resistor R8 is the sampling terminal of the current sampling circuit 105, and the common terminal of the seventh resistor R7 and the fifth capacitor C5 is the output terminal of the current sampling circuit 105.

[0127] like Figure 1 As shown, for example, pin 6 of control chip U1 serves as the second input terminal of control chip U1. Pin 6 of control chip U1 is connected to the output terminal of current sampling circuit 105 and is used to receive current sampling values.

[0128] In this embodiment, an eighth resistor R8 for sampling, a seventh resistor R7 and a fifth capacitor C5 for filtering are provided in the current sampling circuit 105, which improves the accuracy of the current sampling signal acquisition by the control chip U1.

[0129] In some embodiments, the power supply circuit 100 may optionally include a voltage sampling circuit 106, the sampling terminal of which is connected to the secondary winding 1032 of the transformer 103, and the output terminal of which is connected to the third input terminal of the control chip U1.

[0130] In this embodiment of the application, the power supply circuit 100 is further provided with a voltage sampling circuit 106. The sampling terminal of the voltage sampling circuit 106 is connected to the secondary winding 1032 of the transformer 103, thereby sampling the output voltage value of the transformer 103 so that the control chip U1 can monitor the output voltage of the transformer 103.

[0131] like Figure 1 As shown, exemplarily, the voltage sampling circuit 106 includes an eleventh resistor R11 and a twelfth resistor R12. The first end of the eleventh resistor R11 serves as the sampling terminal of the voltage sampling circuit 106 and is connected to the output terminal of the secondary winding 1032. The second end of the eleventh resistor R11 serves as the output terminal of the voltage sampling circuit 106 and is connected to the third input terminal of the control chip U1. The twelfth resistor R12 is connected between the second end of the eleventh resistor R11 and the ground terminal. Pin 5 of the control chip U1 serves as the third input terminal.

[0132] In some embodiments, the power supply circuit 100 may optionally include a ninth resistor R9 and a tenth resistor R10. The first end of the tenth resistor R10 is connected to the first end of the first switch Q1, and the second end of the tenth resistor R10 is connected to the control terminal of the first switch Q1. The first end of the ninth resistor R9 is connected to the control terminal of the first switch Q1, and the second end of the ninth resistor R9 is connected to the ground terminal.

[0133] In this embodiment, the ninth resistor R9 and the tenth resistor R10 are driving resistors for the first switching device Q1, and the ninth resistor R9 and the tenth resistor R10 can drive the first switching device Q1 to switch stably on and off.

[0134] According to one embodiment of this application, Figure 3 The present application provides a structural block diagram of an energy storage system in some embodiments, such as... Figure 3 As shown, the energy storage system 200 includes a battery pack 202 and a power supply circuit 100 in any of the above embodiments, and thus has all the beneficial technical effects of the power supply circuit 100 in any of the above embodiments, which will not be repeated here.

[0135] For example, the energy storage system 200 is connected to the photovoltaic module, and the electrical energy in the photovoltaic module can be stored in the battery pack 202 in the energy storage system, which serves as the DC input source in the power supply circuit 100.

[0136] It should be clarified that in the claims, description, and accompanying drawings of this application, the term "multiple" refers to two or more objects. Unless otherwise explicitly defined, the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description process, not to indicate or imply that the device or element referred to must have the described specific orientation, or be constructed and operated in a specific orientation. Therefore, these descriptions should not be construed as limitations on this application. The terms "connection," "installation," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection between multiple objects, a detachable connection between multiple objects, or an integral connection; it can be a direct connection between multiple objects or an indirect connection between multiple objects through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this application can be understood based on the specific circumstances of the above data.

[0137] In the claims, description, and accompanying drawings of this application, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In the claims, description, and accompanying drawings of this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0138] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A power supply circuit, characterized in that, include: A startup circuit, wherein the first terminal of the startup circuit is connected to a DC input source; A first switching element, wherein a first end of the first switching element is connected to a second end of the starting circuit; A capacitive component, wherein a first end of the capacitive component is connected to a second end of the first switching element, and the second end of the capacitive component is grounded; A control chip, wherein the power supply terminal of the control chip is connected to the second terminal of the first switch, and the first output terminal of the control chip is used to transmit a drive signal to the control terminal of the first switch, wherein the first switch is turned on when the drive signal is a first level signal, and the first switch is turned off when the drive signal is a second level signal. A transformer, wherein the primary winding of the transformer is connected to the DC input source, and the secondary winding of the transformer is used to supply power to the load, wherein the second output terminal of the control chip is used to control the on / off state between the primary winding of the transformer and the DC input source; A standby control circuit, wherein the first input terminal of the standby control circuit is connected to the first output terminal of the control chip, the second input terminal of the standby control circuit is used to receive a first control signal, and the output terminal of the standby control circuit is connected to the control terminal of the first switch. The standby control circuit is used to receive the second-level signal output by the control chip for energy storage, and in response to the first control signal, outputs the energy-stored second-level signal to the control terminal of the first switching device. The first level signal is a low level signal, and the second level signal is a high level signal.

2. The power supply circuit according to claim 1, characterized in that, The standby control circuit includes: A first capacitor, the first terminal of which is electrically connected to the first output terminal of the control chip, and the second terminal of which is grounded; The second switch has a first end connected to the first end of the first capacitor and a second end connected to the control terminal of the first switch. The control terminal of the second switch is used to receive the first control signal.

3. The power supply circuit according to claim 2, characterized in that, The standby control circuit further includes: The first diode has its anode electrically connected to the first output terminal of the control chip, and its cathode connected to the first terminal of the first capacitor. A first resistor, the first end of which is connected to the control terminal of the second switch; The second resistor has its first end connected to the second end of the first resistor, and the second end of the second resistor is used to receive the first control signal.

4. The power supply circuit according to any one of claims 1 to 3, characterized in that, Also includes: The second diode has its cathode connected to the control terminal of the first switch, its anode electrically connected to the first output terminal of the control chip, and its anode connected to the output terminal of the standby control circuit.

5. The power supply circuit according to any one of claims 1 to 3, characterized in that, The power supply circuit also includes: The third resistor has its first end connected to the first output terminal of the control chip, and its second end connected to the first input terminal of the control chip. The second capacitor has its first terminal connected to the second terminal of the third resistor, and its second terminal is grounded. The frequency of the driving signal is related to the resistance value of the third resistor and the capacitance value of the second capacitor.

6. The power supply circuit according to any one of claims 1 to 3, characterized in that, The capacitive component includes: At least two third capacitors are connected in parallel between the second terminal of the first switching element and the ground terminal.

7. The power supply circuit according to any one of claims 1 to 3, characterized in that, The startup circuit includes: At least two fourth resistors are connected in series between the DC input source and the first terminal of the first switch. The total resistance of at least two of the fourth resistors ranges from 100KΩ to 200KΩ.

8. The power supply circuit according to any one of claims 1 to 3, characterized in that, Also includes: The fourth capacitor has its first terminal connected to the first terminal of the primary winding of the transformer, and its second terminal grounded.

9. The power supply circuit according to any one of claims 1 to 3, characterized in that, Also includes: The third switch has its control terminal electrically connected to the second output terminal of the control chip, its first terminal connected to the second terminal of the primary winding of the transformer, and its second terminal grounded.

10. The power supply circuit according to claim 9, characterized in that, Also includes: The fifth resistor has its first end connected to the second output terminal of the control chip, and its second end connected to the control terminal of the third switch. The sixth resistor has its first end connected to the control terminal of the third switch and its second end connected to the second terminal of the third switch.

11. The power supply circuit according to claim 9, characterized in that, Also includes: A current sampling circuit is provided, wherein the sampling terminal of the current sampling circuit is connected to the second terminal of the third switching element, and the output terminal of the current sampling circuit is connected to the second input terminal of the control chip.

12. The power supply circuit according to claim 11, characterized in that, The current sampling circuit includes: The seventh resistor has its first end connected to the second input terminal of the control chip, and its second end connected to the second terminal of the third switch. The eighth resistor has its first end connected to the second end of the third switch, and its second end is grounded. The fifth capacitor has its first terminal connected to the first terminal of the seventh resistor, and its second terminal grounded.

13. The power supply circuit according to any one of claims 1 to 3, characterized in that, Also includes: A voltage sampling circuit, wherein the sampling terminal of the voltage sampling circuit is connected to the secondary winding of the transformer, and the output terminal of the voltage sampling circuit is connected to the third input terminal of the control chip.

14. An energy storage system, characterized in that, include: Battery pack; The power supply circuit according to any one of claims 1 to 13, wherein the startup circuit of the power supply circuit is connected to the DC input source.

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