Driving power supply circuit, power conversion circuit, and power supply
By using a single power supply terminal to drive multiple power transistors in a hierarchical manner in the power supply circuit, the problems of lengthy circuits and complex PCB routing in the prior art are solved, achieving a low-cost and simple power supply design.
Patent Information
- Application Number
- CN202422879530.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2034-11-25
AI Technical Summary
In existing power conversion circuits, the cascading of multiple semiconductor switching transistors means that the drive power supplies cannot share a single power supply and multiple isolated power supplies are required, resulting in lengthy circuits, complex PCB traces, and design difficulties.
A driving power supply circuit is provided, which directly drives multiple power transistors through a single power supply terminal. The charging module drives the next layer of power transistors in stages under different target voltages, forming a closed loop for energy storage, thereby reducing circuit length and PCB routing complexity.
It achieves the generation of different potential driving voltages through only one power supply terminal, reducing the cost of lengthy circuits and the complexity of PCB routing, and avoiding the interference and high cost problems caused by multi-stage cascading.
Smart Images
Figure CN223584025U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to power supply technical field, concretely relates to drive power supply circuit, power conversion circuit and power supply. BACKGROUND
[0002] The existing power conversion circuit has the condition of multistage cascade of semiconductor switching tube, which results in that the drive power supply of power semiconductor cannot share one power supply, and needs multiple mutually isolated power supplies as drive power supply, and the common method is to make one isolation switching power supply for each power supply, and such method has long circuit, high cost, complex PCB (printed circuit board) wiring, and brings great difficulty to design. SUMMARY
[0003] Therefore, the utility model provides a kind of drive power supply circuit, power conversion circuit and power supply to solve the problems of long circuit, high cost and complex PCB wiring in prior art.
[0004] In the first aspect, the utility model provides a kind of drive power supply circuit, and drive power supply circuit is used to drive three layers of power tube, and power supply end is connected with first layer power tube, and power supply end drives first layer power tube to be conducted;
[0005] The circuit comprises:
[0006] The first charging module is connected with the power supply end, the first layer power tube and the second layer power tube, respectively, and is used to store energy when the first layer power tube is conducted, and drive the second layer power tube to be conducted when the energy is stored to the first target voltage.
[0007] The second charging module is connected with the second layer power tube and the third layer power tube, respectively, and is used to store energy when the second layer power tube is conducted, and drive the third layer power tube to be conducted when the energy is stored to the second target voltage.The drive power supply circuit provided by the utility model directly drives the first layer power tube to be conducted by the power supply end, and the closed loop formed after the first layer power tube is conducted stores energy for the first charging module, drives the second layer power tube to be conducted when the first charging module is stored to the first target voltage, and the closed loop formed after the second layer power tube is conducted stores energy for the second charging module, drives the third layer power tube to be conducted when the second charging module is stored to the second target voltage, so that different driving voltages of different potentials are generated by only one power supply end.Compared with the traditional isolation power supply, the circuit length, cost and PCB wiring complexity are reduced.
[0008] In an optional implementation, the first layer power tube comprises a first power tube and a second power tube, and the second layer power tube comprises a third power tube and a fourth power tube.
[0009] The power supply end is connected with the control end of the first power tube and the second power tube respectively;
[0010] The first charging module comprises:
[0011] The first charging unit, the first end of the first charging unit is connected with the power supply end, the second end of the first charging unit is connected with the first end of the first power tube, the third end of the first charging unit is connected with the control end of the third power tube and the second charging module respectively, the first charging unit stores energy when the first power tube is turned on, and drives the third power tube to be turned on when the energy is stored to the first target voltage;
[0012] The second charging unit, the first end of the second charging unit is connected with the power supply end, the second end of the second charging unit is connected with the first end of the second power tube, the third end of the second charging unit is connected with the control end of the fourth power tube and the second charging module respectively, the second charging unit stores energy when the second power tube is turned on, and drives the fourth power tube to be turned on when the energy is stored to the first target voltage.
[0013] In an alternative embodiment, the first charging unit comprises:
[0014] The first diode, the first end of the first diode is connected with the power supply end, the second end of the first diode is connected with the control end of the third power tube and the second charging module respectively;
[0015] The first capacitor, the first end of the first capacitor is connected with the second end of the first diode, the second end of the first capacitor is connected with the first power tube.
[0016] In an alternative embodiment, the second charging unit comprises:
[0017] The second diode, the first end of the second diode is connected with the power supply end, the second end of the second diode is connected with the control end of the fourth power tube and the second charging module respectively;
[0018] The second capacitor, the first end of the second capacitor is connected with the second end of the second diode, the second end of the second capacitor is connected with the second power tube.
[0019] In an alternative embodiment, the third layer power tube comprises: the fifth power tube, the second charging module comprises:
[0020] The third charging unit, the first end of the third charging unit is connected with the second end of the first diode, the second end of the third charging unit is connected with the first end of the third power tube, the first end of the fourth power tube and the first end of the fifth power tube respectively, the third end of the third charging unit is connected with the control end of the fifth power tube, the third charging unit stores energy when the third power tube is turned on, and drives the fifth power tube to be turned on when the energy is stored to the second target voltage;
[0021] The fourth charging unit has a first end connected with the second end of the second diode, a second end connected with the third end of the third charging unit, and is used for storing energy when the fourth power tube is turned on and driving the fifth power tube to be turned on when the energy is stored to the second target voltage.
[0022] In an alternative embodiment, the third charging unit comprises:
[0023] The third diode has a first end connected with the second end of the first diode and a second end connected with the control end of the fifth power tube.
[0024] The third capacitor has a first end connected with the second end of the third diode and a second end connected with the first end of the third power tube, the first end of the fourth power tube and the first end of the fifth power tube respectively.
[0025] In an alternative embodiment, the fourth charging unit comprises:
[0026] The fourth diode has a first end connected with the second end of the second diode and a second end connected with the second end of the third diode.
[0027] In an alternative embodiment, the circuit comprises:
[0028] The filter capacitor has a first end connected with the power supply end and a second end grounded, and is used for filtering the voltage inputted by the power supply end.
[0029] In a second aspect, the utility model provides a kind of power conversion circuit, and the power conversion circuit includes the drive power supply circuit as above.
[0030] In a third aspect, the utility model provides a kind of power supply, and the power supply includes the power conversion circuit as above. BRIEF DESCRIPTION OF DRAWINGS
[0031] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.
[0032] Figure 1 It is the structure diagram of another traditional drive power supply circuit;
[0033] Figure 2 It is the structure diagram of another traditional drive power supply circuit;
[0034] Figure 3 is a structure diagram of a traditional driving power supply circuit;
[0035] Figure 4 is a structure diagram of a driving power supply circuit according to an embodiment of the present application;
[0036] Figure 5 is a structure diagram of a first charging module in a driving power supply circuit according to an embodiment of the present application;
[0037] Figure 6 is a detailed structure diagram of a first charging module in a driving power supply circuit according to an embodiment of the present application;
[0038] Figure 7 is a structure diagram of a second charging module in a driving power supply circuit according to an embodiment of the present application;
[0039] Figure 8 is a detailed structure diagram of a second charging module in a driving power supply circuit according to an embodiment of the present application. DETAILED DESCRIPTION
[0040] The technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0041] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0042] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements, or it can be wireless connection, or it can be wired connection. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0043] In addition, the technical features involved in the different embodiments of the utility model described below can be combined with each other as long as they do not conflict with each other.
[0044] The existing power conversion circuit has the case of multi-stage cascade of semiconductor switching tubes, which leads to the fact that the driving power supply of the power semiconductor cannot share one power supply, and multiple mutually isolated power supplies are needed as driving power supply. There are three common methods, as follows: Figure 1 The first method is to make a separate isolation switching power supply for each power supply. This method has a long circuit and high cost, and the PCB(Printed Circuit Board) wiring is complex, which brings great difficulty to the design. Figure 2 The second method is to generate multiple isolated power supplies simultaneously through a multi-winding transformer. This method has greatly improved the cost, but has brought great difficulty to the safety design of the PCB. Figure 3 The third method is to generate a P+ and P- square wave signal through an isolation transformer, and to generate an isolated power supply through the isolation transformer at the tube end to supply the semiconductor switching tubes of different potentials. This scheme has solved the problem of power supply isolation to a certain extent and optimized the cost of the power supply system to a certain extent, but the P+ and P- square wave signals flow in a large range in the PCB, which brings a huge interference source to the whole machine, which is not conducive to the processing of EMI(Electromagnetic Interference).
[0045] To this end, the embodiment provides a driving power supply circuit, as shown in Figure 4 The driving power supply circuit is used to drive three-layer power tubes. The power supply end is connected with the first layer power tube, and the power supply end drives the first layer power tube to be turned on.
[0046] Specifically, the three-layer power tubes are the first layer power tube, the second layer power tube and the third layer power tube, and the three-layer power tubes are divided according to the driving order. Optionally, the first layer power tube, the second layer power tube and the third layer power tube are one or more power tubes. The power supply end can be connected with the gate driver of the first layer power tube. The power supply end supplies power to the gate driver of the first layer power tube, and drives the first layer power tube to be turned on.
[0047] The circuit comprises:
[0048] The first charging module 10 is connected with the power supply end, the first layer power tube and the second layer power tube respectively. The first charging module 10 is used to store energy when the first layer power tube is turned on, and drives the second layer power tube to be turned on when the energy is stored to the first target voltage.
[0049] Specifically, the power supply end supplies power to the first layer power tube to make the first layer power tube conductive, and after the first layer power tube is conductive, a closed loop is formed by the power supply end, the first layer power tube and the first charging module 10, so that the power supply end stores energy for the first charging module 10, and when the energy is stored to the first target voltage, the first charging module 10 drives the second layer power tube to be conductive. The first charging module 10 is connected with the gate driver of the second layer power tube, and the first charging module 10 supplies power to the gate driver of the second layer power tube to drive the second layer power tube to be conductive. Optionally, the first target voltage can be the gate drive voltage of the second layer power tube. The first charging module 10 can be an energy storage unit.
[0050] The second charging module 20 is connected with the second layer power tube and the third layer power tube respectively, and is used for storing energy when the second layer power tube is conductive, and driving the third layer power tube to be conductive when the energy is stored to the second target voltage.
[0051] Specifically, after the second layer power tube is conductive, a closed loop is formed by the second charging module 20, the second layer power tube and the third layer power tube, so that the first charging module 10 stores energy for the second charging module 20, and when the energy is stored to the second target voltage, the second charging module 20 drives the third layer power tube to be conductive. The second charging module 20 is connected with the gate driver of the third layer power tube, and the second charging module 20 supplies power to the gate driver of the third layer power tube to drive the third layer power tube to be conductive. Optionally, the second target voltage can be the gate drive voltage of the third layer power tube. The second charging module 20 can be an energy storage unit. The first target voltage and the second target voltage can be the same or different.
[0052] The driving power supply circuit provided by the utility model, the power supply end directly drives the first layer power tube to be conductive, a closed loop formed after the first layer power tube is conductive stores energy for the first charging module, when the first charging module stores energy to the first target voltage, the second layer power tube is driven to be conductive, a closed loop formed after the second layer power tube is conductive stores energy for the second charging module, when the second charging module stores energy to the second target voltage, the third layer power tube is driven to be conductive, thereby, only one power supply end generates driving voltage of different potentials. Compared with the traditional isolation power supply, the circuit length cost and the PCB wiring complexity are reduced.
[0053] In some optional embodiments, as shown in Figure 5 The first layer power tube includes: a first power tube Q1 and a second power tube Q2, and the second layer power tube includes: a third power tube Q3 and a fourth power tube Q4;
[0054] The power supply end is connected with control ends of the first power tube Q1 and the second power tube Q2 respectively;
[0055] The first charging module 10 includes:
[0056] The first charging unit 11 has a first end connected to the power supply end, a second end connected to the first end of the first power transistor Q1, and a third end connected to the control end of the third power transistor Q3 and the second charging module 20. The first charging unit 11 stores energy when the first power transistor Q1 is turned on, and drives the third power transistor Q3 to turn on when the stored energy reaches the first target voltage.
[0057] Specifically, the control terminal of the third power transistor Q3 is the power supply terminal of its gate driver. When a 15V voltage is applied to the power supply terminal, it supplies power to the gate driver of the first power transistor Q1. Figure 5 The power supply (DR) in the circuit powers the first power transistor Q1, which in turn turns on the first power transistor Q1. When the first power transistor Q1 is on, the power supply terminal, the first charging unit 11, and the first power transistor Q1 form a closed loop, allowing the power supply terminal to charge the first charging unit 11. When the first charging unit 11 is charged to the first target voltage, the first charging unit 11 powers the gate driver of the third power transistor Q3, thereby turning on the third power transistor Q3. In this way, the first power transistor Q1 and the third power transistor Q3 are driven in stages. Optionally, the first charging unit 11 can be an isolated charging unit.
[0058] The second charging unit 12 has its first end connected to the power supply end, its second end connected to the first end of the second power transistor Q2, and its third end connected to the control end of the fourth power transistor Q4 and the second charging module 20. The second charging unit 12 stores energy when the second power transistor Q2 is turned on, and drives the fourth power transistor Q4 to turn on when the stored energy reaches the first target voltage.
[0059] Specifically, the control terminal of the fourth power transistor Q4 is the power supply terminal of its gate driver. When a 15V voltage is applied to the power supply terminal, it supplies power to the gate driver of the second power transistor Q2. Figure 5 The power supply (DR) in the circuit powers the second power transistor Q2, which in turn turns on the second power transistor Q2. When the second power transistor Q2 is on, the power supply terminal, the second charging unit 12, and the second power transistor Q2 form a closed loop, allowing the power supply terminal to charge the second charging unit 12. When the second charging unit 12 is charged to the second target voltage, the second charging unit 12 powers the gate driver of the fourth power transistor Q4, thereby driving the fourth power transistor Q4 to turn on. In this way, the second power transistor Q2 and the fourth power transistor Q4 are driven in stages. Optionally, the second charging unit 12 can be an isolated charging unit.
[0060] In some alternative implementations, such as Figure 6 As shown, the first charging unit 11 includes:
[0061] The first diode D1 has a first end connected to the power supply end and a second end connected to the control end of the third power tube Q3 and the second charging module;
[0062] The first capacitor C1 has a first end connected to the second end of the first diode D1 and a second end connected to the first power tube Q1.
[0063] Specifically, when the first power tube Q1 is turned on, the power supply end, the first diode D1, the first capacitor C1 and the first power tube Q1 form a closed loop, the voltage of the power supply end charges the first capacitor C1, and the first diode D1 serves as an isolation between the power supply end and the first power tube Q1.
[0064] It should be noted that the first inductor L1 and the second inductor L2 are power inductors of the inverter circuit, which are part of the power topology, and the output capacitor Cb is an inverter output filter capacitor.
[0065] In some alternative embodiments, as shown in FIG. 2, the second charging unit 12 includes: Figure 6
[0066] The second diode D2 has a first end connected to the power supply end and a second end connected to the control end of the fourth power tube Q4 and the second charging module 20.
[0067] The second capacitor C2 has a first end connected to the second end of the second diode D2 and a second end connected to the second power tube Q2.
[0068] Specifically, when the second power tube Q2 is turned on, the power supply end, the second diode D2, the second capacitor C2 and the second power tube Q2 form a closed loop, the voltage of the power supply end charges the second capacitor C2, and the second diode D2 serves as an isolation between the power supply end and the second power tube Q2.
[0069] In some alternative embodiments, as shown in FIG. 2, the second charging unit 12 includes: Figure 7 The third layer power tube includes a fifth power tube Q5, and the second charging module 20 includes:
[0070] The third charging unit 21 has a first end connected to the second end of the first diode D1, a second end connected to the first end of the third power tube Q3, the first end of the fourth power tube Q4 and the first end of the fifth power tube Q5, and a third end connected to the control end of the fifth power tube Q5. The third charging unit 21 stores energy when the third power tube Q3 is turned on, and drives the fifth power tube Q5 to be turned on when the energy is stored to the second target voltage.
[0071] Specifically, the control terminal of the fifth power transistor Q5 is the power supply terminal of the gate driver. When the third power transistor Q3 is turned on, the third power transistor Q3, the first capacitor C1, and the third charging unit 21 form a closed-loop circuit, allowing the first capacitor C1 to charge the third charging unit 21. When the third charging unit 21 is charged to the second target voltage, the third charging unit 21 supplies power to the gate driver of the fifth power transistor Q5, thereby driving the fifth power transistor Q5 to turn on. In this way, the third power transistor Q3 and the fifth power transistor Q5 are driven in stages. Optionally, the third charging unit 21 can be an isolated charging unit.
[0072] The fourth charging unit 22 has its first end connected to the second end of the second diode D2 and its second end connected to the third end of the third charging unit 21. The fourth charging unit 22 stores energy when the fourth power transistor Q4 is turned on and drives the fifth power transistor Q5 to turn on when the energy is stored to the second target voltage.
[0073] Specifically, when the fourth power transistor Q4 is turned on, the fourth power transistor Q4, the second capacitor C2, the third charging unit 21, and the fourth charging unit 22 form a closed-loop circuit, allowing the second capacitor C2 to charge the fourth charging unit 22. When the fourth charging unit 22 is charged to the second target voltage, the fourth charging unit 22 supplies power to the gate driver of the fifth power transistor Q5, thereby driving the fifth power transistor Q5 to turn on. This allows the fourth power transistor Q4 and the fifth power transistor Q5 to be driven in stages. Optionally, the fourth charging unit 22 can be an isolated charging unit.
[0074] In some alternative implementations, such as Figure 8 As shown, the third charging unit 21 includes:
[0075] The third diode D3 has its first terminal connected to the second terminal of the first diode D1, and its second terminal connected to the control terminal of the fifth power transistor Q5.
[0076] The third capacitor C3 has its first terminal connected to the second terminal of the third diode D3. The second terminal of the third capacitor C3 is connected to the first terminal of the third power transistor Q3, the first terminal of the fourth power transistor Q4, and the first terminal of the fifth power transistor Q5, respectively.
[0077] Specifically, when the third power transistor Q3 is turned on, the first capacitor C1, the third diode D3, the third capacitor C3 and the third power transistor Q3 form a closed circuit. The voltage of the first capacitor C1 charges the third capacitor C3, and the third diode D3 isolates the first capacitor C1 and the third power transistor Q3.
[0078] In some alternative implementations, such as Figure 8 As shown, the fourth charging unit 22 includes:
[0079] The fourth diode D4 has a first end connected to the second end of the second diode D2 and a second end connected to the second end of the third diode D3.
[0080] Specifically, when the fourth power tube Q4 is turned on, the second capacitor C2, the fourth diode D4, the third capacitor C3 and the fourth power tube Q4 form a closed loop, the voltage of the second capacitor C2 charges the third capacitor C3, and the fourth diode D4 serves as an isolation between the second capacitor C2 and the fourth power tube Q4.
[0081] In some alternative embodiments, as shown in FIG. Figure 8 The circuit comprises:
[0082] The filter capacitor Ca has a first end connected to the power supply end and a second end grounded, and is configured to filter the voltage input by the power supply end.
[0083] Specifically, the filter capacitor Ca filters the 15V voltage input by the power supply end and outputs to the gate driver of the first power tube Q1.
[0084] It is worth noting that the driving power supply circuit can also be used to drive four-layer power tubes, five-layer power tubes and more layers of power tubes, and can drive multiple power tubes in each layer. The number of charging modules can be changed according to the number of layers and the number of power tubes to be driven.
[0085] In the embodiment, the utility model provides a kind of power conversion circuit, and the power conversion circuit is as above driving power supply circuit and first power tube Q1, second power tube Q2, third power tube Q3, fourth power tube Q4, fifth power tube Q5, so that, by the power supply provided by one power supply end, first power tube Q1 and second power tube Q2 of first layer, third power tube Q3 and fourth power tube Q4 of second layer, fifth power tube Q5 of third layer are driven respectively. And, additional square wave interference is not generated, the problem that multi-stage cascaded semiconductor switching device driving power supply is prone to cause interference is solved, and the problem that multi-stage cascaded semiconductor switching device driving power supply system cost is high.
[0086] In the embodiment, the utility model provides a kind of power supply, and the power supply includes power conversion circuit and maximum power point tracking (MPPT) module, so that the power supply is long and cost is low, and PCB wiring is simple, additional square wave interference is not generated, the problem that multi-stage cascaded semiconductor switching device driving power supply is prone to cause interference is solved, and the problem that multi-stage cascaded semiconductor switching device driving power supply system cost is high.
[0087] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope of the appended claims.
Claims
1. A drive power supply circuit characterized by comprising: The driving power supply circuit is used for driving three-layer power tubes, and the power supply end is connected with the first-layer power tube, and the power supply end drives the first-layer power tube to be turned on; The circuit comprises: A first charging module, which is connected with the power supply end, the first-layer power tube and the second-layer power tube respectively, and is used for storing energy when the first-layer power tube is turned on, and driving the second-layer power tube to be turned on when the energy is stored to a first target voltage; A second charging module, which is connected with the second-layer power tube and the third-layer power tube respectively, and is used for storing energy when the second-layer power tube is turned on, and driving the third-layer power tube to be turned on when the energy is stored to a second target voltage.
2. The circuit of claim 1, wherein, The first-layer power tube comprises a first power tube and a second power tube, and the second-layer power tube comprises a third power tube and a fourth power tube; The power supply end is connected with the control ends of the first power tube and the second power tube respectively; The first charging module comprises: A first charging unit, a first end of the first charging unit is connected with the power supply end, a second end of the first charging unit is connected with a first end of the first power tube, and a third end of the first charging unit is connected with the control end of the third power tube and the second charging module respectively, the first charging unit stores energy when the first power tube is turned on, and drives the third power tube to be turned on when the energy is stored to the first target voltage; A second charging unit, a first end of the second charging unit is connected with the power supply end, a second end of the second charging unit is connected with a first end of the second power tube, and a third end of the second charging unit is connected with the control end of the fourth power tube and the second charging module respectively, the second charging unit stores energy when the second power tube is turned on, and drives the fourth power tube to be turned on when the energy is stored to the first target voltage.
3. The circuit of claim 2, wherein, The first charging unit comprises: A first diode, a first end of the first diode is connected with the power supply end, and a second end of the first diode is connected with the control end of the third power tube and the second charging module respectively; A first capacitor, a first end of the first capacitor is connected with the second end of the first diode, and a second end of the first capacitor is connected with the first power tube.
4. The circuit of claim 3, wherein, The second charging unit comprises: A second diode, a first end of the second diode is connected with the power supply end, and a second end of the second diode is connected with the control end of the fourth power tube and the second charging module respectively; A second capacitor, a first end of the second capacitor is connected with the second end of the second diode, and a second end of the second capacitor is connected with the second power tube.
5. The circuit of claim 4, wherein, The third-layer power tube comprises a fifth power tube, and the second charging module comprises: a third charging unit, a first end of the third charging unit being connected with a second end of the first diode, a second end of the third charging unit being connected with a first end of the third power tube, a first end of the fourth power tube and a first end of the fifth power tube respectively, a third end of the third charging unit being connected with a control end of the fifth power tube, the third charging unit storing energy when the third power tube is turned on, and driving the fifth power tube to be turned on when the third charging unit stores energy to a second target voltage; a fourth charging unit, a first end of the fourth charging unit being connected with a second end of the second diode, a second end of the fourth charging unit being connected with the third end of the third charging unit, the fourth charging unit storing energy when the fourth power tube is turned on, and driving the fifth power tube to be turned on when the fourth charging unit stores energy to a second target voltage.
6. The circuit of claim 5, wherein, the third charging unit comprises: a third diode, a first end of the third diode being connected with a second end of the first diode, a second end of the third diode being connected with a control end of the fifth power tube; a third capacitor, a first end of the third capacitor being connected with a second end of the third diode, a second end of the third capacitor being connected with a first end of the third power tube, a first end of the fourth power tube and a first end of the fifth power tube respectively.
7. The circuit of claim 6, wherein, the fourth charging unit comprises: a fourth diode, a first end of the fourth diode being connected with a second end of the second diode, a second end of the fourth diode being connected with a second end of the third diode.
8. The circuit of claim 7, wherein, the circuit comprises: a filter capacitor, a first end of the filter capacitor being connected with the power supply end, a second end of the filter capacitor being grounded, for filtering a voltage inputted by the power supply end.
9. A power conversion circuit, characterized by, the power conversion circuit comprises the driving power supply circuit according to any one of claims 1 to 8.
10. A power supply, characterized by, the power supply comprises the power conversion circuit according to claim 9.