Power supply circuit and power supply system

Abstract

The utility model discloses a power supply circuit and a power supply system, the power supply circuit comprises a boost-buck circuit, an LC circuit, a first-stage auxiliary source circuit and a second-stage auxiliary source circuit, the input end of the boost-buck circuit receives a first voltage from a power supply device, and the output end of the boost-buck circuit is connected with the LC circuit. The input end of the first-stage auxiliary source circuit receives first voltage from power supply equipment, the input end of the second-stage auxiliary source circuit is connected with the output end of the first-stage auxiliary source circuit, the output end of the second-stage auxiliary source circuit is connected with the buck-boost circuit and the LC circuit, and the input end of the first-stage auxiliary source circuit is further connected with the output end of the buck-boost circuit; the first-stage auxiliary source circuit is used for converting the first voltage into the second voltage, the input end of the first-stage auxiliary source circuit receives the fourth voltage and is used for converting the fourth voltage into the second voltage, and the fourth voltage is larger than the first voltage. By means of the mode, voltage conversion is carried out through the high input voltage, and the conversion efficiency of the first-stage auxiliary source circuit can be improved.

Description

TECHNICAL FIELD

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

[0002] The power supply circuit is used for receiving an input voltage to convert the input voltage into a target voltage. The power supply circuit usually comprises an auxiliary power supply circuit, which is used for converting the input voltage into a driving voltage, and driving a to-be-driven component in the power supply circuit by the driving voltage, so that the to-be-driven component outputs the target voltage.

[0003] The auxiliary power supply circuit needs to convert the input voltage into a preset voltage, and then convert the preset voltage into the driving voltage. However, in the case that the output voltage has a large variation range, the working efficiency of the auxiliary power supply circuit in converting the voltage is low. CONTENT OF THE INVENTION

[0004] The application provides a power supply circuit and a power supply system, which can solve the problem of low working efficiency of the auxiliary power supply circuit in converting the voltage.

[0005] The application provides a power supply circuit connected with a power supply device, which comprises a buck-boost circuit, an LC circuit, a first-stage auxiliary power supply circuit and a second-stage auxiliary power supply circuit. An input end of the buck-boost circuit receives a first voltage from the power supply device. An output end of the buck-boost circuit is connected with the LC circuit. An input end of the first-stage auxiliary power supply circuit receives the first voltage from the power supply device. An input end of the second-stage auxiliary power supply circuit is connected with an output end of the first-stage auxiliary power supply circuit. An output end of the second-stage auxiliary power supply circuit is connected with the buck-boost circuit and the LC circuit respectively. The input end of the first-stage auxiliary power supply circuit is also connected with the output end of the buck-boost circuit.

[0006] The first-stage auxiliary power supply circuit is used for converting the first voltage into a second voltage. The second-stage auxiliary power supply circuit is used for converting the second voltage into a third voltage. The third voltage is used for driving the buck-boost circuit and the LC circuit to work. The input end of the first-stage auxiliary power supply circuit receives a fourth voltage from the output end of the buck-boost circuit, and is used for converting the fourth voltage into the second voltage. The fourth voltage is greater than the first voltage.

[0007] The power supply circuit further comprises a first diode. A positive electrode of the first diode is connected with the power supply device. A negative electrode of the first diode is connected with the input end of the first-stage auxiliary power supply circuit.

[0008] The power supply circuit further comprises a second diode. A positive electrode of the second diode is connected with the output end of the buck-boost circuit. A negative electrode of the second diode is connected with the input end of the first-stage auxiliary power supply circuit.

[0009] The input end of the first auxiliary source circuit receives the first voltage from the power supply device through the first diode; and the input end of the first auxiliary source circuit is configured to receive the fourth voltage from the output end of the boost-buck circuit through the first diode when the boost-buck circuit and the LC circuit are working.

[0010] The power supply circuit further comprises a third diode, the anode of the third diode is connected with the output end of the first auxiliary source circuit, and the cathode of the third diode is connected with the input end of the second auxiliary source circuit.

[0011] The output end of the LC circuit is connected with the energy storage device, the input end of the second auxiliary source circuit is connected with the energy storage device, and the input end of the second auxiliary source circuit receives a fifth voltage from the energy storage device.

[0012] The power supply circuit further comprises a fourth diode, the anode of the fourth diode is connected with the energy storage device, and the cathode of the fourth diode is connected with the input end of the second auxiliary source circuit, and the second voltage is greater than the fifth voltage.

[0013] The LC circuit comprises an LC primary circuit, an LC resonant circuit and an LC secondary circuit, the input end of the LC primary circuit is connected with the output end of the boost-buck circuit, the output end of the LC primary circuit is connected with the input end of the LC resonant circuit, the output end of the LC resonant circuit is connected with the input end of the LC secondary circuit, and the output end of the LC secondary circuit serves as the output end of the power supply circuit.

[0014] The second auxiliary source circuit comprises an auxiliary source transformer, a first driving circuit and a second driving circuit, the input end of the auxiliary source transformer is connected with the output end of the first auxiliary source circuit, the first output end of the auxiliary source transformer is connected with the boost-buck circuit and the LC primary circuit through the first driving circuit respectively, and the second output end of the auxiliary source transformer is connected with the LC secondary circuit through the second driving circuit.

[0015] The application further provides a power supply system, comprising a power supply device, an energy storage device and the power supply circuit, the input end of the power supply circuit is connected with the power supply device, and the output end of the power supply circuit is connected with the energy storage device.

[0016] The beneficial effects of the present application are: the first auxiliary source circuit is used to convert the first voltage into the second voltage, the second auxiliary source circuit is used to convert the second voltage into the third voltage, and the third voltage is used to drive the boost-buck circuit and the LC circuit to work; the input end of the first auxiliary source circuit receives the fourth voltage from the output end of the boost-buck circuit, and is used to convert the fourth voltage into the second voltage, and the fourth voltage is greater than the first voltage. In the above manner, the first auxiliary source circuit receives the fourth voltage from the output end of the boost-buck circuit when the boost-buck circuit and the LC circuit work, and the fourth voltage is greater than the first voltage, so that the input voltage of the first auxiliary source circuit increases from the first voltage to the fourth voltage, the input current decreases, the first auxiliary source circuit converts the fourth voltage into the second voltage, and thus, the conversion efficiency of the first auxiliary source circuit can be improved by converting the voltage from the higher input voltage. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort. Among them:

[0018] Figure 1 is a frame schematic diagram of an embodiment of the power supply circuit provided by the present application;

[0019] Figure 2 is a frame schematic diagram of another embodiment of the power supply circuit provided by the present application;

[0020] Figure 3 is a frame schematic diagram of still another embodiment of the power supply circuit provided by the present application;

[0021] Figure 4 is a frame schematic diagram of still another embodiment of the power supply circuit provided by the present application;

[0022] Figure 5 is a frame schematic diagram of an embodiment of the power supply system provided by the present application. DETAILED DESCRIPTION

[0023] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the use of the terms "including," "comprising," or "having" and variations thereof herein is intended to be broad and encompass the terms "consisting of" and "consisting essentially of" and variations thereof. Unless otherwise required by context, singular terms shall include pluralities and vice versa.

[0025] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0026] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive or alternative embodiments. It is expressly understood that the embodiments described herein are merely examples from among a great variety of embodiments that can be made as described above.

[0027] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0028] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be connected between, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0029] Please refer to Figure 1 as shown, Figure 1 is a frame schematic diagram of an embodiment of the power supply circuit provided by the present application. The power supply circuit 1 of the present embodiment is connected with a power supply device 2, which can refer to storing energy through a device and releasing energy when needed, and is applied to various energy storage application scenarios, such as household energy storage or commercial energy storage, etc.

[0030] Optionally, the input end of the power supply circuit 1 can be a photovoltaic interface, and the power supply device 2 can be a direct current charging device or a photovoltaic assembly connected with the power supply circuit 1 through the photovoltaic interface. The output voltage of the photovoltaic assembly is in a first preset voltage range. For example, the first preset voltage range can be 11V-165V, that is, the minimum output voltage of the photovoltaic assembly is 11V, or the maximum output voltage of the photovoltaic assembly is 165V.

[0031] The power supply circuit 1 of the embodiment includes a boost-buck circuit 11, an LC circuit 12, a first auxiliary power supply circuit 13 and a second auxiliary power supply circuit 14. The LC circuit 12 includes but is not limited to a resonant circuit, the boost-buck circuit 11 can be a boost-buck circuit in the prior art, and the LC circuit 12 can be an LC circuit in the prior art, which will not be described here.

[0032] The input end of the boost-buck circuit 11 receives a first voltage from the power supply device 2, and the output end of the boost-buck circuit 11 is connected with the LC circuit 12. The input end of the first auxiliary power supply circuit 13 receives the first voltage from the power supply device 2, that is, the input end of the boost-buck circuit 11 and the input end of the first auxiliary power supply circuit 13 serve as the input end of the power supply circuit 1. For example, the input end of the boost-buck circuit 11 and the input end of the first auxiliary power supply circuit 13 receive the first voltage from the photovoltaic assembly, and the first voltage is 11V.

[0033] The input end of the second auxiliary power supply circuit 14 is connected with the output end of the first auxiliary power supply circuit 13, and the output end of the second auxiliary power supply circuit 14 is connected with the boost-buck circuit 11 and the LC circuit 12 respectively. The input end of the first auxiliary power supply circuit 13 is also connected with the output end of the boost-buck circuit 11.

[0034] Optionally, the LC circuit 12 can be a pointer oscillation circuit, and the boost-buck circuit 11 can be a BUCK-BOOST circuit. The boost-buck circuit 11 is a boost-buck circuit in the prior art, and the LC circuit 12 is an oscillation circuit in the prior art, which will not be described here.

[0035] Among them, the auxiliary source circuit generally refers to the auxiliary power supply circuit, mainly used for providing stable power supply for various subsystems in electronic equipment. The composition and design of the auxiliary source circuit can be different according to the needs of specific applications, but generally includes the following main parts: transformer: used to convert the input voltage into the required output voltage level. Rectifier circuit: converts alternating current (AC) to direct current (DC). Common rectifier circuits include half-wave rectification, full-wave rectification and bridge rectification. Filter circuit: used to smooth the rectified direct current and reduce ripple. Common filters include capacitor filters, inductor filters and LC filters. Voltage stabilizing circuit: used to provide stable output voltage to prevent input voltage fluctuations from affecting output. Common voltage stabilizers include linear voltage stabilizers (such as 78xx series) and switching voltage stabilizers (such as DC-DC converters). Protection circuit: used to protect the power supply and load from faults such as overcurrent, overvoltage, short circuit, etc. Common protection components include fuses, thermal resistors and overvoltage protection diodes. Control circuit: used to monitor and regulate the output of the power supply to ensure it operates normally under various working conditions. The control circuit may include feedback control, PWM control, etc. Start-up circuit: in some power supply designs, the start-up circuit is used to provide start-up current when the power supply is first turned on to ensure that the power supply can start normally. It can be understood that those skilled in the art can design or select appropriate auxiliary source circuits according to actual needs.

[0036] When the first voltage is received at the input end of the boost-buck circuit 11 and the input end of the first-stage auxiliary source circuit 13, the first-stage auxiliary source circuit 13 is used to convert the first voltage into a second voltage, the input end of the second-stage auxiliary source circuit 14 receives the second voltage, and the second-stage auxiliary source circuit 14 is used to convert the second voltage into a third voltage to provide the third voltage to the boost-buck circuit 11 and the LC circuit 12, and the third voltage is used to drive the boost-buck circuit 11 and the LC circuit 12 to work, at this time the boost-buck circuit 11 is driven to convert the first voltage into a fourth voltage.

[0037] When the fourth voltage is output at the output end of the boost-buck circuit 11, the input end of the first-stage auxiliary source circuit 13 receives the fourth voltage from the output end of the boost-buck circuit 11, and the first-stage auxiliary source circuit 13 is used to convert the fourth voltage into the second voltage, wherein the fourth voltage is greater than the first voltage. Since the fourth voltage is greater than the first voltage, that is, the difference between the second voltage and the fourth voltage is less than the difference between the second voltage and the first voltage, the first-stage auxiliary source circuit 13 converts the fourth voltage into the second voltage, which is more efficient.

[0038] The fourth voltage ranges from 50V to 80V. Taking the first voltage of 11V, the second voltage of 60V, the third voltage of 12V and the fourth voltage of 50V as an example, the input end of the first auxiliary power supply circuit 13 receives 11V, and is configured to convert 11V into 60V. Since the difference between the second voltage and the first voltage is 49V, the large difference leads to low conversion efficiency of the first auxiliary power supply circuit 13. The input end of the second auxiliary power supply circuit 14 receives 60V, and the second auxiliary power supply circuit 14 is configured to convert 60V into 12V, and 12V is used to drive the boost-buck circuit 11 and the LC circuit 12 to work, and the output end of the boost-buck circuit 11 outputs 50V. The input end of the first auxiliary power supply circuit 13 receives 50V, and is configured to convert 50V into 60V. Since the difference between the second voltage and the fourth voltage is 10V, the conversion efficiency of the first auxiliary power supply circuit 13 can be improved.

[0039] The first auxiliary power supply circuit 13 is configured to convert the first voltage into the second voltage, and the second auxiliary power supply circuit 14 is configured to convert the second voltage into the third voltage, and the third voltage is used to drive the boost-buck circuit 11 and the LC circuit 12 to work. The input end of the first auxiliary power supply circuit 13 receives the fourth voltage from the output end of the boost-buck circuit 11, and is configured to convert the fourth voltage into the second voltage, and the fourth voltage is greater than the first voltage. In the above manner, the input end of the first auxiliary power supply circuit 13 receives the fourth voltage from the output end of the boost-buck circuit 11 when the boost-buck circuit 11 and the LC circuit 12 work, and the fourth voltage is greater than the first voltage, so that the input voltage of the first auxiliary power supply circuit 13 increases from the first voltage to the fourth voltage, and the current decreases. The first auxiliary power supply circuit 13 converts the fourth voltage into the second voltage. In this way, voltage conversion is performed by a higher input voltage, and the conversion efficiency of the first auxiliary power supply circuit 13 can be improved.

[0040] According to some embodiments of the present application, referring to Figure 2 , the power supply circuit 1 further comprises a first diode D1 and a second diode D2. Figure 2 The anode of the first diode D1 is connected with the power supply device 2, and the cathode of the first diode D1 is connected with the input end of the first auxiliary power supply circuit 13. The anode of the second diode D2 is connected with the output end of the boost-buck circuit 11, and the cathode of the second diode D2 is connected with the input end of the first auxiliary power supply circuit 13.

[0041]

[0042] ​The input end of the first auxiliary source circuit 13 receives a first voltage from the power supply device 2 through the first diode D1, the first auxiliary source circuit 13 is used to convert the first voltage into a second voltage, the input end of the second auxiliary source circuit 14 receives the second voltage, the second auxiliary source circuit 14 is used to convert the second voltage into a third voltage, and the third voltage is used to drive the boost-buck circuit 11 and the LC circuit 12 to work.

[0043] The input end of the first auxiliary source circuit 13 is used to receive a fourth voltage from the output end of the boost-buck circuit 11 through the second diode D2 when the boost-buck circuit 11 and the LC circuit 12 work, the first auxiliary source circuit 13 is used to convert the fourth voltage into the second voltage, and the second auxiliary source circuit 14 is used to convert the second voltage into the third voltage to provide the third voltage to the boost-buck circuit 11 and the LC circuit 12.

[0044] The power supply circuit 1 of the embodiment further comprises the first diode D1 and the second diode D2, the positive pole of the first diode D1 is connected with the power supply device 2, and the negative pole of the first diode D1 is connected with the input end of the first auxiliary source circuit 13. The positive pole of the second diode D2 is connected with the output end of the boost-buck circuit 11, and the negative pole of the second diode D2 is connected with the input end of the first auxiliary source circuit 13. The input end of the first auxiliary source circuit 13 is connected with the power supply device 2 through the first diode D1, and the input end of the first auxiliary source circuit 13 is connected with the output end of the boost-buck circuit 11 through the second diode D2, so that the circuit is simple and easy to realize.

[0045] According to some embodiments of the present application, please refer to Figure 2 The power supply circuit 1 of the embodiment further comprises the third diode D3.

[0046] The positive pole of the third diode D3 is connected with the output end of the first auxiliary source circuit 13, and the negative pole of the third diode D3 is connected with the input end of the second auxiliary source circuit 14. When the output end of the first auxiliary source circuit 13 outputs the second voltage, the input end of the second auxiliary source circuit 14 receives the second voltage from the output end of the first auxiliary source circuit 13 through the third diode D3. The second auxiliary source circuit 14 is used to convert the second voltage into the third voltage to provide the third voltage to the boost-buck circuit 11 and the LC circuit 12.

[0047] The power supply circuit 1 of the embodiment further comprises the third diode D3, the positive pole of the third diode D3 is connected with the output end of the first auxiliary source circuit 13, and the negative pole of the third diode D3 is connected with the input end of the second auxiliary source circuit 14. The output end of the first auxiliary source circuit 13 is connected with the input end of the second auxiliary source circuit 14 through the third diode D3, so that the circuit is simple and easy to realize.

[0048] According to some embodiments of the present application, please refer to Figure 3 as shown, Figure 3 is a frame diagram of another embodiment of the power supply circuit provided by the present application. The input end of the LC circuit 12 in this embodiment is connected with the output end of the boost-buck circuit 11, and the output end of the LC circuit 12 is connected with the energy storage device 3. Among them, the output end of the LC circuit 12 serves as the output end of the power supply circuit 1, for example, the output end of the LC circuit 12 is an output interface, and the energy storage device 3 is connected with the output interface.

[0049] Among them, the energy storage device 3 can be used to store the electric quantity output by the power supply circuit 1, and can also be used to supply power to other devices to release the electric quantity, and the energy storage device 3 includes but is not limited to a battery pack.

[0050] The input end of the second-stage auxiliary power supply circuit 14 is connected with the energy storage device 3, and the input end of the second-stage auxiliary power supply circuit 14 receives the fifth voltage from the energy storage device 3. For example, the input end of the second-stage auxiliary power supply circuit 14 fails to receive the second voltage from the output end of the first-stage auxiliary power supply circuit 13, and then the input end of the second-stage auxiliary power supply circuit 14 receives the fifth voltage from the energy storage device 3 and converts the fifth voltage into the third voltage.

[0051] For example, the fifth voltage is 50V, the second voltage is 60V, the input end of the second-stage auxiliary power supply circuit 14 is connected with the output end of the first-stage auxiliary power supply circuit 13 and the energy storage device 3 respectively, and the input end of the second-stage auxiliary power supply circuit 14 receives the second voltage from the output end of the first-stage auxiliary power supply circuit 13 and receives the fifth voltage from the energy storage device 3 at the same time. Since the fifth voltage is less than the second voltage, the input end of the second-stage auxiliary power supply circuit 14 receives the second voltage from the output end of the first-stage auxiliary power supply circuit 13, so as to reduce the loss of the energy storage device 3 and improve the service life of the energy storage device 3.

[0052] Optionally, please refer to Figure 3 as shown, the power supply circuit 1 in this embodiment further includes a fourth diode D4. The anode of the fourth diode D4 in this embodiment is connected with the energy storage device 3, the cathode of the fourth diode D4 is connected with the input end of the second-stage auxiliary power supply circuit 12, and the second voltage is greater than the fifth voltage.

[0053] According to some embodiments of the present application, please refer to Figure 4 as shown, Figure 4 is a frame diagram of another embodiment of the power supply circuit provided by the present application. The LC circuit 12 in this embodiment includes an LC primary circuit 121, an LC resonant circuit 122 and an LC secondary circuit 123, the input end of the LC primary circuit 121 is connected with the output end of the boost-buck circuit 11, the output end of the LC primary circuit 121 is connected with the input end of the LC resonant circuit 122, the output end of the LC resonant circuit 122 is connected with the input end of the LC secondary circuit 123, and the output end of the LC secondary circuit 123 serves as the output end of the power supply circuit 1.

[0054] The second-stage auxiliary power circuit 14 includes an auxiliary power transformer 141, a first driving circuit 142, and a second driving circuit 143. The input terminal of the auxiliary power transformer 141 is connected to the output terminal of the first-stage auxiliary power circuit 13. The first output terminal of the auxiliary power transformer 141 is connected to the step-up / step-down circuit 11 and the LC primary circuit 121 through the first driving circuit 142. The second output terminal of the auxiliary power transformer 141 is connected to the LC secondary circuit 123 through the second driving circuit 143.

[0055] Optionally, both the first driving circuit 142 and the second driving circuit 143 are used to output a third voltage to provide a third voltage to the buck-boost circuit 11, the LC primary circuit 121, and the LC secondary circuit 123, thereby driving the buck-boost circuit 11, the LC primary circuit 121, and the LC secondary circuit 123 to operate. For example, each of the buck-boost circuit 11, the LC primary circuit 121, and the LC secondary circuit 123 includes a switching transistor. The first driving circuit 142 is connected to the control terminal of the switching transistor in the buck-boost circuit 11 and the control terminal of the switching transistor in the LC primary circuit 121, respectively. The second driving circuit 143 is connected to the control terminal of the switching transistor in the LC secondary circuit 123 to control the operation of the switching transistors in the buck-boost circuit 11, the LC primary circuit 121, and the LC secondary circuit 123.

[0056] This application also provides a power supply system; please refer to [link / reference]. Figure 5 As shown, Figure 5 This is a schematic diagram of a framework of an embodiment of the power system provided in this application. The power system of this embodiment includes a power supply device 2, an energy storage device 3, and a power circuit 1 disclosed in the above embodiment. The input terminal of the power circuit 1 is connected to the power supply device 2, and the output terminal of the power circuit 1 is connected to the energy storage device 3.

[0057] In summary, the first-stage auxiliary power supply circuit 13 of this application is used to convert the first voltage into a second voltage, and the second-stage auxiliary power supply circuit 14 is used to convert the second voltage into a third voltage. The third voltage is used to drive the buck-boost circuit 11 and the LC circuit 12. The input terminal of the first-stage auxiliary power supply circuit 13 receives a fourth voltage from the output terminal of the buck-boost circuit 11, which is used to convert the fourth voltage into the second voltage. The fourth voltage is greater than the first voltage. In this way, when the buck-boost circuit 11 and the LC circuit 12 are working, the first-stage auxiliary power supply circuit 13 receives a fourth voltage from the output terminal of the buck-boost circuit 11. The fourth voltage is greater than the first voltage, so that the input voltage of the first-stage auxiliary power supply circuit 13 increases from the first voltage to the fourth voltage, the current decreases, and the first-stage auxiliary power supply circuit 13 converts the fourth voltage into the second voltage. Thus, voltage conversion using a higher input voltage can improve the conversion efficiency of the first-stage auxiliary power supply circuit 13.

[0058] The above merely describes the embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, which is made according to the content of the present application specification and drawings, is also included in the patent protection scope of the present application.

Claims

1. A power supply circuit, characterized by comprising: The power supply circuit is connected with a power supply device, and comprises a boost-buck circuit, an LC circuit, a first-stage auxiliary power supply circuit and a second-stage auxiliary power supply circuit. An input end of the boost-buck circuit receives a first voltage from the power supply device. An output end of the boost-buck circuit is connected with the LC circuit. An input end of the first-stage auxiliary power supply circuit receives the first voltage from the power supply device. An input end of the second-stage auxiliary power supply circuit is connected with an output end of the first-stage auxiliary power supply circuit. An output end of the second-stage auxiliary power supply circuit is connected with the boost-buck circuit and the LC circuit respectively. The input end of the first-stage auxiliary power supply circuit is also connected with the output end of the boost-buck circuit. The first-stage auxiliary power supply circuit is configured to convert the first voltage into a second voltage. The second-stage auxiliary power supply circuit is configured to convert the second voltage into a third voltage. The third voltage is used to drive the boost-buck circuit and the LC circuit to work. The input end of the first-stage auxiliary power supply circuit receives a fourth voltage from the output end of the boost-buck circuit, and is configured to convert the fourth voltage into the second voltage. The fourth voltage is greater than the first voltage.

2. The power supply circuit of claim 1, wherein, The power supply circuit further comprises a first diode. A positive electrode of the first diode is connected with the power supply device. A negative electrode of the first diode is connected with the input end of the first-stage auxiliary power supply circuit.

3. The power supply circuit of claim 2, wherein, The power supply circuit further comprises a second diode. A positive electrode of the second diode is connected with the output end of the boost-buck circuit. A negative electrode of the second diode is connected with the input end of the first-stage auxiliary power supply circuit.

4. The power supply circuit of claim 3, wherein, The input end of the first-stage auxiliary power supply circuit receives the first voltage from the power supply device through the first diode. The input end of the first-stage auxiliary power supply circuit is configured to receive the fourth voltage from the output end of the boost-buck circuit through the second diode when the boost-buck circuit and the LC circuit work.

5. The power supply circuit according to any one of claims 1 to 4, characterized by, The power supply circuit further comprises a third diode. A positive electrode of the third diode is connected with the output end of the first-stage auxiliary power supply circuit. A negative electrode of the third diode is connected with the input end of the second-stage auxiliary power supply circuit.

6. The power supply circuit of claim 5, wherein, An output end of the LC circuit is connected with an energy storage device. The input end of the second-stage auxiliary power supply circuit is connected with the energy storage device. The input end of the second-stage auxiliary power supply circuit receives a fifth voltage from the energy storage device.

7. The power supply circuit of claim 6, wherein, The power supply circuit further comprises a fourth diode. A positive electrode of the fourth diode is connected with the energy storage device. A negative electrode of the fourth diode is connected with the input end of the second-stage auxiliary power supply circuit. The second voltage is greater than the fifth voltage.

8. The power supply circuit of claim 5, wherein, The LC circuit comprises an LC primary circuit, an LC resonant circuit and an LC secondary circuit. An input end of the LC primary circuit is connected with an output end of the boost-buck circuit. An output end of the LC primary circuit is connected with an input end of the LC resonant circuit. An output end of the LC resonant circuit is connected with an input end of the LC secondary circuit. An output end of the LC secondary circuit serves as an output end of the power supply circuit.

9. The power supply circuit of claim 8, wherein, The second-stage auxiliary power supply circuit comprises an auxiliary power supply transformer, a first driving circuit and a second driving circuit, the input end of the auxiliary power supply transformer is connected with the output end of the first-stage auxiliary power supply circuit, the first output end of the auxiliary power supply transformer is connected with the boost-buck circuit and the LC primary circuit through the first driving circuit respectively, and the second output end of the auxiliary power supply transformer is connected with the LC secondary circuit through the second driving circuit.

10. A power supply system characterized by comprising: The power supply circuit according to any one of claims 1-9, wherein the input end of the power supply circuit is connected with a power supply device, and the output end of the power supply circuit is connected with an energy storage device.

Images