Auxiliary power supply circuit and control method thereof, and light storage and charging integrated system

Abstract

The invention provides an auxiliary power supply circuit and a control method thereof, and a light storage and charging integrated system. The auxiliary power supply circuit comprises a transformer; the primary side of the transformer comprises a starting winding and a main power winding which are arranged on the same magnetic core; wherein the first end of the starting winding is connected to a first input source, and the second end of the starting winding is connected to a first reference ground end through the first switching device; the first end of the main power winding is connected to a second input source, and the second end of the main power winding is connected to a second reference ground end through a second switching device. The secondary side of the transformer comprises a first output winding and a second output winding, and the first output winding and the second output winding are respectively used for outputting electric energy of the auxiliary power supply circuit. According to the scheme, on the premise that stable power supply of the power supply circuit is met, at least one transformer and related circuit structures thereof are omitted, so that the circuit design is simplified, and the hardware cost and standby loss are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power conversion, in particular to an auxiliary power supply circuit, a control method thereof and a light storage and charging integrated system. BACKGROUND

[0002] In a photovoltaic, energy storage and charging integrated system, in order to ensure the reliable operation of the system, an auxiliary power supply circuit supporting multiple input sources needs to be configured to provide stable power for the related low-voltage circuits of each converter in the system.

[0003] However, since each input source of the auxiliary power supply circuit is difficult to supply power at the same time, in order to ensure that the system can maintain normal operation when any input source has power supply capability, in the related art, the auxiliary power supply circuit adopts a power supply mode of multiple power modules to improve the power supply reliability, resulting in a complex overall structure and high hardware cost. SUMMARY

[0004] The present application provides an auxiliary power supply circuit, a control method thereof and a light storage and charging integrated system, which can simplify the structure of the auxiliary power supply circuit to a certain extent and reduce the hardware cost.

[0005] In a first aspect, the present application provides an auxiliary power supply circuit, comprising a transformer; a primary side of the transformer comprises a starting winding and a main power winding arranged on the same magnetic core; wherein a first end of the starting winding is connected to a first input source, and a second end of the starting winding is connected to a first reference ground end through a first switching device; a first end of the main power winding is connected to a second input source, and a second end of the main power winding is connected to a second reference ground end through a second switching device; a secondary side of the transformer comprises a first output winding and a second output winding, and the first output winding and the second output winding are respectively used to output power of the auxiliary power supply circuit.

[0006] In a second aspect, the present application provides a light storage and charging integrated system, comprising the auxiliary power supply circuit of the first aspect.

[0007] In a third aspect, the present application provides a control method of an auxiliary power supply circuit, applied to the auxiliary power supply circuit of the first aspect, and the control method comprises: controlling the first switching device to be turned on, so that the power of the first input source is coupled to the secondary side through the starting winding of the primary side; and controlling the second switching device to be turned on and the first switching device to be turned off, so that the power of the second input source is coupled to the secondary side through the main power winding of the primary side.

[0008] In multiple embodiments provided in the application, the starting winding and the main power winding are arranged on the same magnetic core on the primary side of the transformer, the starting winding is connected with the first switching device and is connected to the first input source, the main power winding is connected with the second switching device and is connected to the second input source, and multiple output windings are arranged on the secondary side of the transformer, so that multiple input source power supply and multiple voltage output are realized. In this way, at least one transformer and related circuit structure can be saved to meet the stable power supply of the power supply circuit, so that the circuit structure is simplified and the hardware cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only a part of the embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of the provided drawings.

[0010] Figure 1 It is a schematic diagram of a light storage and charging integrated system in the related art.

[0011] Figure 2 It is another schematic diagram of a light storage and charging integrated system in the related art.

[0012] Figure 3 It is a circuit schematic diagram of an auxiliary power supply circuit in the related art.

[0013] Figure 4 It is a structural schematic diagram of an auxiliary power supply circuit provided by an embodiment of the present application.

[0014] Figure 5 It is a structural schematic diagram of an auxiliary power supply circuit provided by an embodiment of the present application.

[0015] Figure 6 It is a circuit schematic diagram of an auxiliary power supply circuit provided by an embodiment of the present application.

[0016] Figure 7 It is a control method flow chart of an auxiliary power supply circuit provided by an embodiment of the present application. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments.

[0018] In the description of the embodiments of the present application, it should be understood that the terms "first", "second" are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified.

[0019] With the continuous development of new energy technology, photovoltaic, energy storage and charging (photovoltaic energy storage and charging) integrated system is increasingly widely used. Such integrated system usually has multiple input sources such as photovoltaic power supply, energy storage battery and electric vehicle charging interface, and realizes energy coordination and complementation between multiple sources through a DC bus. In order to ensure the reliable operation of the system, an auxiliary power supply circuit is configured in the system to provide stable power for the related low-voltage circuits of each converter in the system.

[0020] For example Figure 1 , Figure 2 As shown in the integrated system, the input sources include photovoltaic power supply PV, energy storage battery BAT, electric vehicle charging interface EV-CAR and alternating current grid AC, and the main circuit includes DC-DC (Direct Current to Direct Current, DC-DC), DC-AC (Direct Current to Alternating Current, DC-AC) and DC-DC isolated converter (Isolated DC-DC Converter, isolated DC-DC converter). In order to ensure the continuous and reliable operation of the above main circuit, an auxiliary power supply circuit supporting multiple input sources needs to be configured in the system to provide stable working power for the control circuit, drive circuit and other key low-voltage circuits of each converter.

[0021] However, in the photovoltaic energy storage and charging integrated system, it cannot be ensured that each input source has power supply capability at any time. For example, photovoltaic power supply is difficult to supply power at night, energy storage battery may be difficult to supply power due to power loss, and electric vehicle interface is also difficult to supply power when no vehicle is connected. Therefore, in order to ensure that the system can maintain normal operation when any input source has power supply capability, in the related art, the auxiliary power supply circuit adopts the mode of multiple power supply modules cooperating to supply power to improve the power supply reliability.

[0022] For example Figure 3The auxiliary power supply circuit 100 shown is configured by two power modules to realize auxiliary power supply for the system: among them, the power module 1 takes power from the secondary side of the EV-CAR to supply the primary side, so as to provide auxiliary power for the system when the electric vehicle charging interface has power supply capability; the power module 2 simultaneously accesses the energy storage battery BAT and the positive direct current bus BUS+, and supplies power for each low-voltage circuit or load through an isolation structure and multiple output windings (such as winding N1 and winding N2). Although the auxiliary power supply circuit 100 can maintain stable power supply for the system to a certain extent, the overall structure is complex, the hardware cost is high, and the standby loss is large in some working states.

[0023] Therefore, how to further simplify the structure of the circuit, reduce the hardware cost and standby loss under the premise of ensuring stable power supply of the auxiliary power supply circuit has become an important problem to be solved in the current technology.

[0024] Please refer to Figure 4 The embodiment of the present application provides an auxiliary power supply circuit 200. The power supply circuit 200 comprises a transformer 110, and the primary side of the transformer 110 comprises a starting winding N11 and a main power winding N12 arranged on the same magnetic core. Among them, the first end of the starting winding N11 is connected to the first input source 120, and the second end of the starting winding N11 is connected to the first reference ground end GND1 through the first switching device Q1. The first end of the main power winding N12 is connected to the second input source 130, and the second end of the main power winding is connected to the second reference ground end GND2 through the second switching device Q2. The secondary side of the transformer 110 comprises a first output winding N21 and a second output winding N22, and the first output winding N21 and the second output winding N22 are used to output the power of the auxiliary power supply circuit 200.

[0025] In the embodiment, the power supply circuit 200 adopts a single power module structure, and the starting winding N11 and the main power winding N12 are arranged on the magnetic core of the same transformer 110. The first end of the starting winding N11 is connected to the first input source 120, and the second end is connected to the first reference ground GND1 through the first switching device Q1. The first input source 120 can be, for example, an electric vehicle charging interface or the like. By controlling the first switching device Q1 to be turned on or turned off, the power supply path of the first input source 120 can be controlled, so that the electric energy of the first input source 120 can be coupled to the secondary side through the starting winding N11. The first end of the main power winding N12 is connected to the second input source 130, and the second end is connected to the second reference ground GND2 through the second switching device Q2. The second input source 130 can be, for example, an energy storage battery, a photovoltaic power supply, a direct-current bus or the like, or any combination thereof. By controlling the second switching device Q2 to be turned on or turned off, the power supply path of the second input source 130 can be controlled, so that the electric energy of the second input source 130 can be coupled to the secondary side through the main power winding N12. The first reference ground GND1 and the second reference ground GND2 can be set according to the electrical isolation requirements of the input source. The first switching device Q1 and the second switching device Q2 can be power semiconductor devices with fast switching characteristics, such as MOSFET or IGBT. The secondary side of the transformer 110 includes the first output winding N21 and the second output winding N22. The multi-output winding structure can provide multiple voltage outputs at the same time to meet the power supply requirements of different low-voltage circuits or loads. Of course, in other embodiments, more input windings can be arranged on the same magnetic core, thereby further integrating the power supply paths of more input sources, thereby saving more transformers and related circuit structures (indicated by ellipsis in the figure), which will not be described here.

[0026] In Figure 5The auxiliary power supply circuit 200 is shown as an example. In the embodiment, the starting winding N11 and the main power winding N12 are arranged on the same magnetic core. The first end of the starting winding N11 is connected to the electric vehicle charging interface EV-CAR, and the second end is connected to the reference ground end EV_GND of the electric vehicle charging interface through the first switching device Q1. The first end of the main power winding N12 is connected to the energy storage battery BAT and the positive direct current bus BUS+ at the same time, and the second end is connected to the reference ground end PCS_GND of the power conversion system through the second switching device Q2. The first switching device Q1 and the second switching device Q2 are both N-channel enhancement mode power MOSFETs. In the power supply circuit 200, the starting winding N11 cooperates with the main power winding N12. By controlling the first switching device Q1 to be turned on and turned off, the adjustment of the power supply path of the first input source 120 can be realized, so that the electric energy of the EV-CAR is coupled to the secondary side through the starting winding N11, thereby providing the initial electric energy for the secondary side to realize the normal start of the circuit. By controlling the second switching device Q2 to be turned on and turned off, the adjustment of the power supply path of the second input source 130 can be realized, so that the electric energy of the energy storage battery BAT or the positive direct current bus BUS+, or the superimposed electric energy of the two, is coupled to the secondary side through the main power winding N12 after the completion of the start of the circuit, thereby providing the main power electric energy for the secondary side to meet the power demand of each low-voltage circuit or load. The secondary side of the transformer 110 includes the first output winding N21 and the second output winding N22, one of which can be used to supply power to the control circuit, the driving circuit and other low-voltage circuits, and the other of which can be used to supply power to the external load, thereby meeting the needs of different low-voltage circuits or loads. In this way, the power supply circuit 200 can realize multi-input source power supply and multi-voltage output with only one transformer 110, and can maintain stable power supply when any input source has power supply capability. Among them, the starting winding N11 is only used in the start-up stage of the power supply circuit 200, and a wire with a smaller diameter can be used to further save the size and cost of the magnetic core. At the same time, since the starting winding N11 and the main power winding N12 are arranged on the same magnetic core and work at different times, the standby loss can be effectively reduced.

[0027] Therefore, the power supply circuit 200 of the above embodiment can replace the multi-power module structure in the related art with a single-power module structure, arrange the starting winding N11 and the main power winding N12 on the same magnetic core, and cooperate with the first switching device Q1 and the second switching device Q2 at the same time, thereby saving at least one transformer and its related circuit structure while ensuring stable power supply of the power supply circuit 200, thereby simplifying the circuit structure and reducing the hardware cost and standby loss.

[0028] In some embodiments, the power supply circuit 200 can include a start control unit. A first input terminal of the start control unit is connected to the first input source 120 through a first resistor, and an output terminal of the start control unit is connected to a control terminal of the first switch device Q1. When the first input source 120 supplies power, the start control unit can start to work under the action of the first input source 120, and output a signal to control the first switch device Q1 to be turned on, so that the power of the first input source 120 is coupled to the secondary side through the start winding N11 on the primary side.

[0029] In the embodiment, the power supply circuit 200 realizes the power supply control of the start winding N11 by setting the start control unit. The start control unit can be a slow start control chip or other control circuit with voltage detection and driving output functions. Specifically, a first input terminal of the start control unit is connected to the first input source 120 through a first resistor, and an output terminal of the start control unit is connected to a control terminal of the first switch device Q1. When the first input source 120 has the power supply capability, the start control unit can start to work under the action of the first input source 120, and output a control signal to drive the first switch device Q1 to be turned on, so that the power of the first input source 120 is coupled to the secondary side through the start winding N11 on the primary side, and the initial start power is provided for the circuit on the secondary side, thereby realizing the smooth start of the power supply circuit 200. Through the cooperation of the start control unit and the first switch device Q1, not only the reliable start of the power supply circuit 200 can be realized, but also the coupling path of the first input source 120 can be disconnected in the non-start stage, so as to reduce the electrical interference or additional power loss of the circuit on the secondary side, thereby improving the efficiency and safety of the power supply circuit 200.

[0030] Please refer to Figure 6 In the embodiment, the power supply circuit 200 includes a start control unit 140, which can specifically be a slow start control chip IC. A first input terminal (power supply terminal) of the slow start control chip IC is connected to the electric vehicle charging interface EV-CAR through a first resistor R1, and an output terminal of the slow start control chip IC is connected to a control terminal of the first switch device Q1. When the EV-CAR has the power supply capability, the slow start control chip IC obtains a stable power supply voltage under the voltage division action of the first resistor R1, and outputs a control signal to drive the first switch device Q1 to be turned on after completing the internal start process, so that the power of the EV-CAR is coupled to the secondary side through the start winding N11 on the primary side, and the initial start power is provided for the circuit on the secondary side, thereby realizing the smooth start of the power supply circuit 200. Through the cooperation of the slow start control chip and the first switch device Q1, not only the reliable start of the power supply circuit 200 can be realized, but also the coupling path of the EV-CAR can be disconnected in the non-start stage, so as to reduce the electrical interference or additional power loss of the circuit on the secondary side, thereby improving the efficiency and safety of the power supply circuit 200.

[0031] In some embodiments, the power supply circuit 200 can further include a high-voltage starting unit, a voltage stabilizing unit and a signal processing unit. The first input end of the high-voltage starting unit is connected to the second input source 130, the output end of the high-voltage starting unit is connected to the input end of the voltage stabilizing unit, the output end of the voltage stabilizing unit is connected to the input end of the signal processing unit, and the first output end of the signal processing unit is connected to the control end of the second switching device Q2. When the second input source 130 supplies power, the high-voltage starting unit starts to work under the action of the second input source 130, and supplies power to the signal processing unit through the voltage stabilizing unit. The signal processing unit starts to work and outputs a signal to control the second switching device Q2 to be turned on, so that the power of the second input source 130 is coupled to the secondary side through the primary side main power winding N12.

[0032] In the embodiment, the power supply circuit 200 realizes the power supply control of the main power winding N12 by setting the high-voltage starting unit and cooperating with the voltage stabilizing unit and the signal processing unit. Specifically, the input end of the high-voltage starting unit is connected to the second input source 130. When the second input source 130 has power supply capability, the high-voltage starting unit can start to work under the action of the second input source 130 and output a direct current voltage to the voltage stabilizing unit. The high-voltage starting unit can adopt, for example, a power taking control circuit composed of a voltage dividing resistor, a starting capacitor and a controllable switching device, or other controllable circuit structure capable of obtaining a direct current voltage from a high-voltage input. The voltage stabilizing unit can convert the input direct current voltage into a stable low-voltage direct current voltage, which is used to provide working power for the signal processing unit. The voltage stabilizing unit can adopt, for example, a linear voltage stabilizer or other circuit structure with voltage stabilizing function. The signal processing unit can start to work under the action of the low-voltage direct current voltage and output a control signal to drive the second switching device Q2 to be turned on, so that the power of the second input source 130 is coupled to the secondary side through the primary side main power winding N12 to provide initial starting power for the secondary side circuit. The signal processing unit can adopt, for example, a digital signal processor (DSP) or other circuit structure with logic control and signal output functions. Through the cooperation of the high-voltage starting unit, the voltage stabilizing unit, the signal processing unit and the second switching device Q2, the power supply circuit 200 can realize reliable starting through the second input source 130 when the first input source 120 cannot supply power, so that stable power supply can be maintained when any input source of the power supply circuit 200 has power supply capability.

[0033] Please refer to Figure 6In the embodiment, the power supply circuit 200 comprises a high-voltage starting unit 150, a voltage stabilizing unit 160 and a signal processing unit 170. The high-voltage starting unit 150 specifically adopts a power taking control circuit composed of a voltage dividing resistor, a starting capacitor and a MOSFET; the voltage stabilizing unit 160 specifically adopts a linear voltage stabilizer; and the signal processing unit 170 specifically adopts a DSP. When the energy storage battery BAT or the positive direct current bus BUS+ is powered, the high-voltage starting unit 150 can be started to work under the action of the energy storage battery BAT or the positive direct current bus BUS+, and output a direct current voltage to the linear voltage stabilizer. The linear voltage stabilizer can convert the input direct current voltage into a low-voltage direct current voltage such as 3.3V. The DSP can be started to work under the action of the low-voltage direct current voltage, output a control signal and drive the second switching device Q2 to be turned on through the driving circuit 180, so that the energy of the energy storage battery BAT or the positive direct current bus BUS+ is coupled to the secondary side through the primary side main power winding N12 to provide initial starting energy for the secondary side circuit, thereby realizing smooth starting of the power supply circuit 200. The driving circuit 180 can for example adopt a switching tube driving module composed of a gate driving chip. Through mutual cooperation of the high-voltage starting unit 150, the linear voltage stabilizer, the DSP and the second switching device Q2, the power supply circuit 200 can realize reliable starting through the energy storage battery BAT or the positive direct current bus BUS+ when the EV-CAR cannot be powered, so that stable power supply can be maintained when any input source of the power supply circuit 200 has power supply capability.

[0034] In some embodiments, the second output end of the signal processing unit can be connected with the second input end of the starting control unit and the second input end of the high-voltage starting unit respectively. When the second switching device is turned on, the signal processing unit outputs a signal to control the starting control unit and the high-voltage starting unit to stop working.

[0035] In the embodiment, the power supply circuit 200 realizes switching management between the starting stage and the normal working stage of the power supply circuit 200 through cooperation of the signal processing unit with the starting control unit and the high-voltage starting unit. Specifically, the second output end of the signal processing unit is connected with the second input end of the starting control unit and the second input end of the high-voltage starting unit respectively. When the second switching device Q2 is turned on, i.e. the power supply circuit 200 completes initial starting and can stably supply power to the secondary side through the main power winding N12, the signal processing unit outputs a signal to control the starting control unit and the high-voltage starting unit to stop working. In this way, not only smooth transition of the power supply circuit 200 from the starting stage to the normal working stage can be realized, but also the redundant circuit units can be automatically turned off after the power supply circuit 200 enters the normal working stage, thereby effectively reducing power loss and improving the operation efficiency and safety of the power supply circuit 200.

[0036] In some embodiments, the power supply circuit 200 can further comprise a starting control unit 140. The starting control unit 140 can be connected with the second input end of the high-voltage starting unit 150 and the second input end of the signal processing unit 170. When the second switching device Q2 is turned on, the signal processing unit 170 outputs a signal to control the starting control unit 140 and the high-voltage starting unit 150 to stop working. Figure 6For example, in the embodiment, the power supply circuit 200 cooperates with the DSP, the soft-start control chip IC and the high-voltage starting unit 150 to realize smooth switching between the starting stage and the normal working stage of the power supply circuit 200. Specifically, a signal output end of the DSP is connected with the control end of the soft-start control chip IC and the control end of the high-voltage starting unit 150 respectively. When the second switching device Q2 is turned on, i.e. in the case that the power supply circuit 200 completes initial starting and can stably supply power to the secondary side through the main power winding N12, the DSP outputs a turn-off signal Disable to turn off the soft-start control chip IC, and the turn-off signal also acts on the high-voltage starting unit 150 to turn off the high-voltage starting unit 150. In this way, not only the smooth transition of the power supply circuit 200 from the starting stage to the normal working stage can be realized, but also the redundant circuit units can be automatically turned off after the power supply circuit 200 enters the normal working stage, thereby effectively reducing the power loss in operation and improving the operation efficiency and safety of the power supply circuit 200.

[0037] In some embodiments, the first end of the second output winding N22 can be connected to the input end of the voltage stabilizing unit through a unidirectional switching device. In the case that the high-voltage starting unit is turned off, the second output winding N22 supplies power to the signal processing unit through the voltage stabilizing unit.

[0038] In the embodiment, the first output winding N21 of the power supply circuit 200 can be used to supply power to an external load, and the second output winding N22 can be used to supply power to low-voltage circuits such as control circuits and driving circuits, so as to meet the power demand of different low-voltage circuits or loads. Specifically, the first end of the first output winding N21 can be connected to a load end, and the second end thereof can be connected to a first reference ground end GND1. The first end of the second output winding N22 can be connected to the input end of the voltage stabilizing unit through a unidirectional switching device, and the second end thereof can be connected to a second reference ground end GND2, wherein the unidirectional switching device can be used to prevent the voltage at the input end of the voltage stabilizing unit from generating reverse interference on the second output winding N22, for example, the unidirectional switching device can be a diode. In the case that the high-voltage starting unit is turned off, i.e. in the case that the power supply circuit 200 completes initial starting and stably supplies power to the secondary side through the main power winding N12, the second output winding N22 can supply stable low-voltage power to the signal processing unit and related low-voltage circuits through the voltage stabilizing unit. In this way, the power supply circuit 200 can continuously supply power to the low-voltage circuits in the normal working state, thereby ensuring the reliable operation of the low-voltage circuits such as control circuits and driving circuits and improving the stability of the power supply circuit 200.

[0039] For example, in the embodiment, the power supply circuit 200 cooperates with the DSP, the soft-start control chip IC and the high-voltage starting unit 150 to realize smooth switching between the starting stage and the normal working stage of the power supply circuit 200. Specifically, a signal output end of the DSP is connected with the control end of the soft-start control chip IC and the control end of the high-voltage starting unit 150 respectively. When the second switching device Q2 is turned on, i.e. in the case that the power supply circuit 200 completes initial starting and can stably supply power to the secondary side through the main power winding N12, the DSP outputs a turn-off signal Disable to turn off the soft-start control chip IC, and the turn-off signal also acts on the high-voltage starting unit 150 to turn off the high-voltage starting unit 150. In this way, not only the smooth transition of the power supply circuit 200 from the starting stage to the normal working stage can be realized, but also the redundant circuit units can be automatically turned off after the power supply circuit 200 enters the normal working stage, thereby effectively reducing the power loss in operation and improving the operation efficiency and safety of the power supply circuit 200. Figure 6For example, in the embodiment, the first output winding N21 of the power supply circuit 200 can output a voltage of about 12V for supplying power to an external load, and the second output winding N22 can also output a voltage of about 12V for supplying power to low-voltage circuits such as a control circuit and a driving circuit. Specifically, the second end of the first output winding N21 is connected to a reference ground end EV GND of an electric vehicle charging interface, and the second end of the second output winding N22 is connected to a reference ground end PCS GND of the power conversion system. The first end of the second output winding N22 is connected to an input end of a linear voltage regulator through a diode D1, and the diode D1 is used to prevent the voltage at the input end of the linear voltage regulator from interfering with the second output winding N22 in a reverse direction. When the high-voltage starting unit 150 is turned off, that is, when the power supply circuit 200 completes the initial starting and stably supplies power to the secondary side through the main power winding N12, the second output winding N22 provides stable low-voltage power for the DSP and related low-voltage circuits through the linear voltage regulator. Therefore, the power supply circuit 200 can continuously supply power to the low-voltage circuits in a normal working state, thereby ensuring the reliable operation of the low-voltage circuits such as the control circuit and the driving circuit and improving the stability of the power supply circuit 200.

[0040] The embodiment of the present application also provides a light storage and charging integrated system, which comprises the auxiliary power supply circuit 200 in any of the foregoing embodiments.

[0041] The specific functions and effects of the units in the light storage and charging integrated system can be explained by referring to the foregoing embodiments, and will not be described here.

[0042] Please refer to Figure 7 The embodiment of the present application also provides a control method of an auxiliary power supply circuit, which is suitable for the auxiliary power supply circuit 200 in any of the foregoing embodiments. The control method of the auxiliary power supply circuit can be applied to a control device of the auxiliary power supply circuit. The control device can be an electronic device with certain computing capability. Of course, the control device can also refer to a software program running in the electronic device. In a specific embodiment, the control device can adopt a controller of the auxiliary power supply circuit.

[0043] The control method of the auxiliary power supply circuit comprises the following steps.

[0044] In step S110, the first switch device is controlled to be turned on, so that the electric energy of the first input source is coupled to the secondary side through the starting winding on the primary side.

[0045] In step S120, the second switch device is controlled to be turned on and the first switch device is controlled to be turned off, so that the electric energy of the second input source is coupled to the secondary side through the main power winding on the primary side.

[0046] In this embodiment, when both the first and second input sources are capable of supplying power, the control device first controls the first switching device to turn on, allowing the electrical energy from the first input source to enter the primary side of the transformer via the first switching device, and then coupled to the secondary side through the starting winding of the primary side, thereby providing initial starting power for the secondary side circuit and enabling the power supply circuit to start smoothly. Next, the control device controls the second switching device to turn on, while simultaneously turning off the first switching device, allowing the electrical energy from the second input source to enter the primary side of the transformer via the second switching device, and then coupled to the secondary side through the main power winding of the primary side. At this time, the power supply path of the main power winding replaces the power supply path of the starting winding, and the low-voltage circuit and load on the secondary side are stably powered by the second input source. Through this phased control method, the power supply circuit can not only achieve multi-input source power supply and multi-channel voltage output using only one transformer, but also automatically shut down redundant circuit units after the power supply circuit enters normal operation, thereby simplifying the circuit structure, saving hardware costs, and effectively reducing power loss.

[0047] by Figure 6 Taking the power supply circuit 200 shown as an example, the control device in this embodiment may include a soft-start control chip IC, a high-voltage startup unit, a linear regulator, and a DSP. When both the first and second input sources have power supply capabilities, the EV-CAR first supplies power to the soft-start control chip IC via the first resistor R1. After completing its internal startup process, the soft-start control chip IC outputs a control signal to drive the first switching device Q1 to conduct, allowing the EV-CAR's electrical energy to be coupled to the secondary side via the primary-side startup winding N11, providing initial startup energy for the secondary-side circuit. After the power supply circuit 200 completes its initial startup, the second output winding N22 can output approximately 12V, which is converted to 3.3V via diode D1 and the linear regulator to provide operating power to the DSP. After the DSP starts working, it outputs a shutdown signal "Disable," causing the soft-start control chip IC to stop working, thereby turning off the first switching device Q1. Simultaneously, the DSP output control signal drives the second switching device Q2 to conduct, enabling the electrical energy from the energy storage battery BAT or the positive DC bus BUS+ to be coupled to the secondary side through the main power winding N12 on the primary side. The low-voltage circuit and load on the secondary side are stably powered by the second input source. In this way, the power supply circuit 200 achieves multi-input source power supply and multi-channel voltage output with only one transformer, reducing hardware costs and power loss. Furthermore, since the starting winding N11 and the first switching device Q1 only operate during the starting phase, electromagnetic interference and heat generation problems of the transformer are reduced or avoided.

[0048] In some embodiments, the control device can control the first switching device to turn on when the first input source is powered and the second input source is not powered, so that the electrical energy of the first input source is coupled to the secondary side through the starting winding on the primary side.

[0049] In the embodiment, when the first input source has power supply capability but the second input source does not have power supply capability, the control device first controls the first switching device to be turned on, so that the electric energy of the first input source enters the primary side of the transformer through the first switching device, and is coupled to the secondary side through the starting winding on the primary side, thereby providing initial starting electric energy for the circuit on the secondary side, and realizing smooth starting of the power supply circuit. After starting is completed, the control device can control the first switching device to be turned off and the second switching device to be turned on according to the running requirement, thereby ending the process of taking electric energy from the first input source, and entering the next working stage.

[0050] Still taking the Figure 6 For example, in the embodiment, when the EV-CAR has power supply capability but the energy storage battery BAT and the positive direct current bus BUS+ do not have power supply capability, first, the EV-CAR supplies power to the slow-start control chip IC through the first resistor R1, and after the slow-start control chip IC completes the internal starting process, the slow-start control chip IC outputs a control signal to drive the first switching device Q1 to be turned on, so that the electric energy of the EV-CAR is coupled to the secondary side through the starting winding N11 on the primary side, thereby providing initial starting electric energy for the circuit on the secondary side. After the power supply circuit 200 completes the initial starting, the second output winding N22 can output about 12V voltage, which is converted into 3.3V voltage through the diode D1 and the linear voltage stabilizer in turn, to provide working power for the DSP. After the DSP starts working, the DSP can output a turn-off signal Disable to make the slow-start control chip IC stop working, thereby making the first switching device Q1 be turned off. Meanwhile, the DSP can output a control signal to drive the second switching device Q2 to be turned on, thereby ending the process of taking electric energy from the EV-CAR, and entering the next working stage.

[0051] In some embodiments, the control device can control the second switching device to be turned on when the second input source supplies power and the first input source does not supply power, so that the electric energy of the second input source is coupled to the secondary side through the main power winding on the primary side.

[0052] Still taking the Figure 6For example, in the embodiment, in the case that the energy storage battery BAT or the positive DC bus BUS+ has the power supply capability, but the EV-CAR does not have the power supply capability, the high-voltage starting unit can start to work under the action of the energy storage battery BAT or the positive DC bus BUS+, and output a DC voltage to the linear voltage regulator. The linear voltage regulator can convert the input DC voltage into a voltage of about 3.3V to provide a working power supply for the DSP. After the DSP starts to work, a control signal can be output to drive the second switching device Q2 to turn on, so that the energy of the energy storage battery BAT or the positive DC bus BUS+ is coupled to the secondary side through the primary side main power winding N12, to provide initial starting energy for the secondary side circuit. At the same time, the DSP outputs a disable signal Disable to act on the high-voltage starting unit, so that the high-voltage starting unit is turned off. After the high-voltage starting unit is turned off, the second output winding N22 outputs a voltage of about 12V, and then the voltage is converted into a voltage of 3.3V through the diode D1 and the linear voltage regulator, to continue to provide a working power supply for the DSP. The DSP continues to control the second switching device Q2 to turn on, so that the energy of the second input source is continuously coupled to the secondary side through the primary side main power winding N12, thereby ensuring the continuous and stable operation of the power supply circuit 200.

[0053] Other specific functions and effects of each step in the control method of the auxiliary power supply circuit can be explained by referring to the foregoing embodiment, and will not be described here.

[0054] The embodiment of the present application also provides a control device, which comprises a processor and a memory. The memory is used to store a computer program, instruction or code. The processor is used to execute the program, instruction or code in the memory, so as to complete the control method as introduced in the foregoing embodiment.

[0055] In the embodiments of the present application, the implementation can be achieved by software, hardware, firmware or any combination thereof, in whole or in part. When implemented by software, the implementation can be achieved in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions according to the embodiments of the present application are generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center through wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) mode. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. integrated with one or more available media. The available media can be magnetic media (such as floppy disk, hard disk, magnetic tape), or semiconductor media (such as solid state disk (SSD)) and the like.

[0056] The embodiments of the present application also provide a readable storage medium for storing the control method or algorithm provided by the above-mentioned embodiments. For example, random access memory (RAM), flash memory, read only memory (ROM), EPROM memory, non-volatile read only memory (Electronic Programmable ROM, EPROM), register, hard disk, removable disk or any other form of storage medium in the art.

[0057] It can be understood that the "connection" in the embodiments of the present application should be understood as "electrical connection", "communication connection" and the like if the circuits, modules, units and the like connected to each other can have the transmission of electrical signals or data.

[0058] It can be understood that the specific examples herein are only to help those skilled in the art better understand the embodiments of the present application, and do not limit the scope of the present application.

[0059] It can be understood that in various embodiments of the present application, the size of the serial number of each process does not mean the execution order, and the execution order of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0060] It can be understood that various embodiments described in the present application can be implemented independently or in combination, and the present application is not limited thereto.

[0061] Unless otherwise defined, all technical and scientific terms used in the embodiments of the present application have the same meanings as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the present application are only for the purpose of describing the specific embodiments and are not intended to limit the scope of the present application. The term "and / or" used in the present application includes any and all combinations of one or more related listed items. The singular forms "a", "an" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0062] Those skilled in the art can appreciate that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware or in combination of computer software and electronic hardware. Whether the functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. A person skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0063] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be limited by the protection scope of the claims.

Claims

1. An auxiliary power supply circuit, characterized by comprising: comprising a transformer; a primary side of the transformer comprises a starting winding and a main power winding arranged on the same magnetic core; wherein a first end of the starting winding is connected to a first input source, and a second end of the starting winding is connected to a first reference ground through a first switching device; a first end of the main power winding is connected to a second input source, and a second end of the main power winding is connected to a second reference ground through a second switching device; a secondary side of the transformer comprises a first output winding and a second output winding, and the first output winding and the second output winding are respectively used to output electric energy of the auxiliary power supply circuit.

2. The power supply circuit of claim 1, wherein, further comprising a starting control unit; a first input end of the starting control unit is connected to the first input source through a first resistor, and an output end of the starting control unit is connected to a control end of the first switching device; under the condition of power supply of the first input source, the starting control unit starts to work under the action of the first input source, and outputs a signal to control the first switching device to be turned on, so that the electric energy of the first input source is coupled to the secondary side through the starting winding of the primary side.

3. The power supply circuit of claim 2, wherein, further comprising a high-voltage starting unit, a voltage stabilizing unit and a signal processing unit; wherein a first input end of the high-voltage starting unit is connected to the second input source, an output end of the high-voltage starting unit is connected to an input end of the voltage stabilizing unit, an output end of the voltage stabilizing unit is connected to an input end of the signal processing unit, and a first output end of the signal processing unit is connected to a control end of the second switching device; under the condition of power supply of the second input source, the high-voltage starting unit starts to work under the action of the second input source, and supplies the signal processing unit with power through the voltage stabilizing unit, the signal processing unit starts to work and outputs a signal to control the second switching device to be turned on, so that the electric energy of the second input source is coupled to the secondary side through the main power winding of the primary side.

4. The power supply circuit of claim 3, wherein a second output end of the signal processing unit is connected to a second input end of the starting control unit and a second input end of the high-voltage starting unit respectively; under the condition that the second switching device is turned on, the signal processing unit outputs a signal to control the starting control unit and the high-voltage starting unit to stop working.

5. The power supply circuit of claim 4, wherein, a first end of the second output winding is connected to an input end of the voltage stabilizing unit through a unidirectional switching device; under the condition that the high-voltage starting unit is turned off, the second output winding supplies the signal processing unit with power through the voltage stabilizing unit.

6. The power supply circuit according to any one of claims 1 to 5, characterized by the first input source comprises an electric vehicle charging interface; and the second input source comprises a photovoltaic power supply and / or an energy storage battery.

7. A light storage and charging integrated system, characterized in that, comprising the auxiliary power supply circuit according to any one of claims 1 to 6.

8. A control method of an auxiliary power supply circuit, characterized by, applicable to the power supply circuit according to any one of claims 1 to 6, the control method comprises: controlling the first switching device to be turned on, so that the electric energy of the first input source is coupled to the secondary side through the starting winding of the primary side; controlling the second switching device to be turned on and the first switching device to be turned off, so that the electric energy of the second input source is coupled to the secondary side through the main power winding of the primary side.

9. The control method according to claim 8, characterized by, the control method further comprises: under the condition that the first input source supplies power and the second input source does not supply power, Controlling the first switch device to be conductive, so that the electric energy of the first input source is coupled to the secondary side through the start winding of the primary side.

10. The control method according to claim 8, characterized by The control method further comprises: In the case that the second input source supplies power and the first input source does not supply power, Controlling the second switch device to be conductive, so that the electric energy of the second input source is coupled to the secondary side through the main power winding of the primary side.

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