Switching power supply circuit of vehicle and vehicle

Abstract

The invention relates to the technical field of electronic application, in particular to a switching power supply circuit of a vehicle and the vehicle. The input end of an RDC clamping circuit is used for inputting direct-current pulsating voltage, the output end of the RDC clamping circuit is connected with the input end of a transformer device, and the output end of the transformer device is connected with the input end of a filter circuit; the output end of the filter circuit is connected with the load circuit, the control end of the switching circuit is connected with the control signal output end, and the first end of the switching circuit and the second end of the switching circuit are connected with a grounding node. The problems that in a switching power supply circuit in the prior art, due to leakage inductance of a transformer, voltage spike suppression is insufficient, strong electromagnetic interference can be caused, and energy consumption is affected are solved, by optimizing capacitance and resistance parameters and combining dynamic energy management, voltage spikes generated when a switching tube is turned off are effectively suppressed, electromagnetic interference is reduced, and the reliability of the switching power supply circuit is improved. And the circuit reliability is improved.

Description

Technical Field

[0001] The present application relates to the field of electronic application technologies, and particularly relates to a switching power supply circuit for a vehicle and a vehicle. Background Art

[0002] The RCD (Resistor-Capacitor-Diode) clamping circuit of a flyback switching power supply is composed of a resistor R1, a capacitor C1, and a diode D1. When the switching tube is turned off, the energy stored in the leakage inductance Lk of the transformer cannot be coupled to the secondary side through an ideal transformer, but is released through the parasitic capacitance Cds of the switching tube, which will cause a voltage spike in the drain-source Vds (Voltage between Drain and Source). Therefore, it is very necessary to suppress the voltage spike.

[0003] In the related art, the traditional RCD clamping circuit (composed of a resistor R1, a capacitor C1, and a diode D1) is used to suppress the voltage spike. Although it can absorb part of the energy, there are the following problems: (1) Insufficient voltage spike suppression: The value of the capacitor C1 may not be optimized, resulting in a high voltage change rate (dv / dt), and the switching tube may still be damaged; (2) EMI (Electromagnetic Interference) problem: During the high-frequency switching process, the voltage mutation will cause strong electromagnetic interference; (3) Large energy loss: The unreasonable value of the resistor R1 may lead to unbalanced energy dissipation, affecting the efficiency, and it is urgent to solve. Summary of the Invention

[0004] The present application provides a switching power supply circuit for a vehicle and a vehicle to solve the problems of insufficient voltage spike suppression, strong electromagnetic interference, and energy consumption caused by the leakage inductance of the transformer in the switching power supply circuit in the related art.

[0005] The first aspect embodiment of the present application provides a switching power supply circuit for a vehicle, including: an RDC clamping circuit, a transformer component, a filtering circuit, and a switching circuit, where

[0006] The input end of the RDC clamping circuit is used to input a DC pulsating voltage, and the output end of the RDC clamping circuit is connected to the input end of the transformer component;

[0007] The output end of the transformer component is connected to the input end of the filtering circuit;

[0008] The output end of the filtering circuit is connected to a load circuit;

[0009] The control terminal of the switching circuit is connected to the control signal output terminal, and the first terminal and the second terminal of the switching circuit are connected to the ground node;

[0010] Wherein, when the switching circuit is in the off state, the leakage inductance energy generated by the transformer component is absorbed through the RDC clamping circuit.

[0011] According to an embodiment of the present application, the RDC clamping circuit includes:

[0012] A first resistor, one end of the first resistor is respectively connected to the output terminal of the DC pulsating voltage and the first end of the input terminal of the transformer component;

[0013] A first capacitor, one end of the first capacitor is connected to the connection node between one end of the first resistor and the first end of the input terminal of the transformer component;

[0014] A first diode, the cathode of the first diode is respectively connected to the other end of the first resistor and the other end of the first capacitor, and the other end of the first diode is connected to the connection node between the second end of the input terminal of the transformer component and the switching circuit.

[0015] According to an embodiment of the present application, the filtering circuit includes:

[0016] A second diode, the anode of the second diode is connected to the first end of the output terminal of the transformer component, and the cathode of the second diode is connected to the positive pole of the output terminal of the switching power supply circuit;

[0017] A filtering capacitor, the positive pole of the filtering capacitor is connected to the connection node between the cathode of the second diode and the positive pole of the output terminal of the switching power supply circuit, and the negative pole of the filtering capacitor is respectively connected to the second end of the output terminal of the transformer component and the negative pole of the output terminal of the switching power supply circuit.

[0018] According to an embodiment of the present application, the transformer component includes: a transformer and the leakage inductance of the transformer and the inductance of the primary winding of the transformer generated by the transformer, wherein,

[0019] One end of the leakage inductance of the transformer is connected to one end of the first capacitor, and the other end of the leakage inductance of the transformer is connected to the first end of the primary side of the transformer;

[0020] One end of the inductance of the primary winding of the transformer is connected to the first end of the primary side of the transformer, and the other end of the inductance of the primary winding of the transformer is connected to the second end of the primary side of the transformer.

[0021] According to an embodiment of the present application, the switching circuit includes: a MOS (Metal-Oxide-Semiconductor) transistor and a parasitic capacitance generated by the MOS transistor, wherein,

[0022] The gate of the MOS transistor is connected to the control signal output terminal, the source of the MOS transistor is connected to the second end of the primary side of the transformer, and the drain of the MOS transistor is connected to the ground node.

[0023] According to an embodiment of the present application, the MOS transistor is a PMOS (P-channel Metal-Oxide-Semiconductor) transistor.

[0024] According to an embodiment of the present application, the capacitance value of the first capacitor and the resistance value of the first resistor are determined according to the voltage peak value when the switching circuit is in the off state.

[0025] For the switching power supply circuit of a vehicle according to an embodiment of the present application, the input end of the RDC clamping circuit is used to input a DC pulsating voltage, the output end is connected to the input end of the transformer component, the output end of the transformer component is connected to the input end of the filtering circuit, the output end of the filtering circuit is connected to the load circuit, the control end of the switching circuit is connected to the control signal output end, and the first end and the second end of the switching circuit are connected to the ground node. Thus, the problems in the related art such as insufficient suppression of voltage spikes due to transformer leakage inductance in the switching power supply circuit, strong electromagnetic interference being caused, and energy consumption being affected are solved. By optimizing the capacitance and resistance parameters and combining dynamic energy management, the voltage spike when the switching tube is turned off is effectively suppressed, the electromagnetic interference is reduced, and the circuit reliability is improved.

[0026] An embodiment of the second aspect of the present application provides a vehicle, including: the switching power supply circuit according to any one of the above embodiments.

[0027] For the vehicle according to an embodiment of the present application, the input end of the RDC clamping circuit is used to input a DC pulsating voltage, the output end is connected to the input end of the transformer component, the output end of the transformer component is connected to the input end of the filtering circuit, the output end of the filtering circuit is connected to the load circuit, the control end of the switching circuit is connected to the control signal output end, and the first end and the second end of the switching circuit are connected to the ground node. Thus, the problems in the related art such as insufficient suppression of voltage spikes due to transformer leakage inductance in the switching power supply circuit, strong electromagnetic interference being caused, and energy consumption being affected are solved. By optimizing the capacitance and resistance parameters and combining dynamic energy management, the voltage spike when the switching tube is turned off is effectively suppressed, the electromagnetic interference is reduced, and the circuit reliability is improved.

[0028] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. Brief Description of the Drawings

[0029] The above-mentioned and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description of embodiments in conjunction with the accompanying drawings, where:

[0030] Figure 1 FIG. [X] is a schematic block diagram of a switching power supply circuit for a vehicle provided according to an embodiment of the present application;

[0031] Figure 2 FIG. [X] is a schematic circuit diagram according to an embodiment of the present application;

[0032] Figure 3 FIG. [X] is a schematic diagram of the Vds voltage coordinates according to an embodiment of the present application. Detailed Description of the Embodiments

[0033] Embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application and should not be construed as limiting the present application.

[0034] A switching power supply circuit for a vehicle and a vehicle according to embodiments of the present application will be described below with reference to the accompanying drawings. Regarding the problems in the switching power supply circuit in the related art mentioned in the above background technology, such as insufficient suppression of voltage spikes due to transformer leakage inductance, strong electromagnetic interference being caused, and energy consumption being affected, the present application provides a switching power supply circuit for a vehicle. In this circuit, the input end of the RDC clamping circuit is used to input a DC pulsating voltage, the output end is connected to the input end of the transformer component, the output end of the transformer component is connected to the input end of the filtering circuit, the output end of the filtering circuit is connected to the load circuit, the control end of the switching circuit is connected to the control signal output end, and the first end and the second end of the switching circuit are connected to the ground node. Thus, the problems in the switching power supply circuit in the related art, such as insufficient suppression of voltage spikes due to transformer leakage inductance, strong electromagnetic interference being caused, and energy consumption being affected, are solved. By optimizing the capacitance and resistance parameters and combining dynamic energy management, the voltage spikes during the turn-off of the switching tube are effectively suppressed, electromagnetic interference is reduced, and the circuit reliability is improved.

[0035] Specifically, Figure 1The block diagram of a switching power supply circuit 10 for a vehicle provided by an embodiment of the present application includes: an RDC clamping circuit 101, a transformer component 102, a filtering circuit 103, and a switching circuit 104. Among them, the input end of the RDC clamping circuit 101 is used to input a DC pulsating voltage VIN (Input Voltage), and the output end of the RDC clamping circuit 101 is connected to the input end of the transformer component 102; the output end of the transformer component 102 is connected to the input end of the filtering circuit 103; the output end of the filtering circuit 103 is connected to a load circuit; the control end of the switching circuit 104 is connected to a control signal output end, and the first end and the second end of the switching circuit 104 are connected to a ground node; among them, when the switching circuit 104 is in an off state, the RDC clamping circuit 101 absorbs the leakage inductance energy generated by the transformer component 102.

[0036] According to an embodiment of the present application, the RDC clamping circuit 101 includes: a first resistor, one end of the first resistor is respectively connected to the output end of the DC pulsating voltage and the first end of the input end of the transformer component 102; a first capacitor, one end of the first capacitor is connected to the connection node between one end of the first resistor and the first end of the input end of the transformer component 102; a first diode, the cathode of the first diode is respectively connected to the other end of the first resistor and the other end of the first capacitor, and the other end of the first diode is connected to the connection node between the second end of the input end of the transformer component 102 and the switching circuit 104.

[0037] Specifically, as Figure 2 shown, the embodiment of the present application mainly includes an RDC clamping circuit 101, a transformer component 102, a filtering circuit 103, and a switching circuit 104. Among them, the input end of the RDC clamping circuit 101 is used to input a DC pulsating voltage VIN, the output end of the RDC clamping circuit 101 is connected to the input end of the transformer component 102, the RDC clamping circuit 101 mainly includes a first resistor R1, a first capacitor C1, and a first diode D1. One end of the first resistor R1 is respectively connected to the output end of the DC pulsating voltage VIN and the first end of the input end of the transformer component 102. One end of the first capacitor C1 is connected to the connection node between one end of the first resistor R1 and the first end of the input end of the transformer component 102. The cathode of the first diode D1 is respectively connected to the other end of the first resistor R1 and the other end of the first capacitor C1. The other end of the first diode D1 is connected to the connection node between the second end of the input end of the transformer component 102 and the switching circuit 104.

[0038] According to an embodiment of the present application, the transformer component 102 includes: a transformer and the leakage inductance of the transformer and the inductance of the primary winding of the transformer generated by the transformer. Wherein, one end of the leakage inductance of the transformer is connected to one end of the first capacitor, and the other end of the leakage inductance of the transformer is connected to the first end of the primary side of the transformer; one end of the inductance of the primary winding of the transformer is connected to the first end of the primary side of the transformer, and the other end of the inductance of the primary winding of the transformer is connected to the second end of the primary side of the transformer.

[0039] Specifically, as Figure 2 shown, the output end of the transformer component 102 of the embodiment of the present application is connected to the input end of the filter circuit 103, and mainly includes a transformer T1 and the leakage inductance Lk of the transformer T1 and the inductance Lp of the primary winding of the transformer T1 generated by the transformer T1. Wherein, one end of the leakage inductance Lk of the transformer T1 is connected to one end of the first capacitor C1, the other end of the leakage inductance Lk of the transformer T1 is connected to the first end of the primary side of the transformer T1, one end of the inductance Lp of the primary winding of the transformer T1 is connected to the first end of the primary side of the transformer T1, the other end of the inductance Lp of the primary winding of the transformer T1 is connected to the second end of the primary side of the transformer T1, the leakage inductance Lk of the transformer T1 is in series with the inductance Lp of the primary winding of the transformer T1, the inductance Lp of the primary winding of the transformer T1 is in parallel with the transformer T1, and the energy of the inductance Lp of the primary winding of the transformer T1 can be coupled to the secondary side through the ideal transformer T1 to provide energy for the subsequent load.

[0040] According to an embodiment of the present application, the filter circuit 103 includes: a second diode, the anode of the second diode is connected to the first end of the output end of the transformer component 102, and the cathode of the second diode is connected to the positive pole of the output end of the switching power supply circuit; a filter capacitor, the positive pole of the filter capacitor is connected to the connection node between the cathode of the second diode and the positive pole of the output end of the switching power supply circuit, and the negative pole of the filter capacitor is respectively connected to the second end of the output end of the transformer component 102 and the negative pole of the output end of the switching power supply circuit.

[0041] Specifically, as Figure 2 shown, the output end of the filter circuit 103 of the embodiment of the present application is connected to the load circuit, and mainly includes a second diode D2 and a filter capacitor E1. Wherein, the anode of the second diode D2 is connected to the first end of the output end of the transformer component 102, the cathode of the second diode D2 is connected to the positive pole VOUT+ (Output Voltage) of the output end of the switching power supply circuit, the positive pole of the filter capacitor E1 is connected to the connection node between the cathode of the second diode D2 and the positive pole VOUT+ of the output end of the switching power supply circuit, and the negative pole of the filter capacitor E1 is respectively connected to the second end of the output end of the transformer component 102 and the negative pole VOUT- of the output end of the switching power supply circuit.

[0042] According to an embodiment of the present application, the switching circuit 104 includes: a MOS transistor and a parasitic capacitance generated by the MOS transistor. The gate of the MOS transistor is connected to the control signal output terminal, the source of the MOS transistor is connected to the second end of the primary side of the transformer, and the drain of the MOS transistor is connected to the ground node.

[0043] Specifically, as Figure 2 shown, the first end and the second end of the switching circuit 104 of the embodiment of the present application are connected to the ground node, and mainly include a MOS transistor Q1 and a parasitic capacitance Cds (Drain-to-Source Capacitance) generated by the MOS transistor. The gate of the MOS transistor Q1 is connected to the control signal output terminal, the source of the MOS transistor Q1 is connected to the second end of the primary side of the transformer T1, and the drain of the MOS transistor Q1 is connected to the ground node. The present application can determine the capacitance value of the first capacitor C1 and the resistance value of the first resistor R1 according to the voltage peak value when the switching circuit 104 is in the off state. The MOS transistor in the embodiment of the present application is a PMOS transistor.

[0044] As Figure 2 shown, VIN is the DC pulsating voltage after rectification. When the MOS transistor Q1 is turned off, the drain current drops rapidly, and the primary current of the transformer T1 charges the parasitic capacitance Cds. The first diode D1 conducts. Since the capacitance value of the first capacitor C1 is much larger than the parasitic capacitance Cds, the energy released by the leakage inductance Lk is mainly used to charge the first capacitor C1. Also, due to the characteristic that the capacitor voltage cannot change suddenly and the larger the capacitance value, the smaller the voltage change rate, the presence of the first capacitor C1 reduces the peak value of the drain-source voltage of the MOS transistor Q1, reduces the voltage change rate of the MOS transistor Q1, and the EMI of the power supply is better. When the current in the winding reverses, the first diode D1 is cut off, and the charging of the first capacitor C1 ends. At this time, the first capacitor C1 discharges through the first resistor R1, and the energy of the leakage inductance Lk absorbed by the first capacitor C1 is consumed through the first resistor R1.

[0045] The following analyzes in combination with the key waveforms of the specific RDC circuit:

[0046] As Figure 3 shown, it is a waveform diagram of the Vds voltage of the MOS transistor Q1 changing with time. Before the moment t1, that is, when the ordinate is zero, the MOS transistor Q1 is conducting. Since the inductance Lp of the primary winding of the transformer T1 is relatively large, and the voltage across the primary winding inductance Lp is proportional to the current change rate, the current flowing through the leakage inductance Lk rises linearly. At the moment t1, the MOS transistor Q1 is turned off.

[0047] Further, at the time from t1 to t2, due to the effect of the inductance Lp of the primary winding of the transformer T1, the primary current flowing through the transformer T1 remains basically unchanged. At this time, the first diode D1 in the RDC clamping circuit 101 is turned off, and the second diode D2 in the output circuit is reversely cut off. This stage can be considered as the constant-current charging of the parasitic capacitance Cds of the MOS transistor Q1 by the primary current of the transformer T1. At this time, the first capacitor C1 slowly discharges to the first resistor R1. When the drain voltage is greater than the sum of the rectified input voltage and the feedback voltage of the secondary side of the transformer T1, the energy of the primary side of the transformer T1 is coupled to the secondary side, rectified by the rectifying second diode D2, and starts to supply energy to the load after being filtered by the filter capacitor E1.

[0048] Further, after the time t2, the parasitic capacitance Cds is greater than the sum of the input voltage and the voltage across the first capacitor C1 at this time. The first diode D1 is turned on, and the current flowing through the first diode D1 rises sharply. At the same time, the first capacitor C1 is continuously charged until the primary current of the transformer T1 drops to zero at the time t3, and the first diode D1 is turned off again. At this time, the drain voltage rises to the maximum value.

[0049] Further, after the time t3, since the voltage across the parasitic capacitance Cds is greater than the input voltage, a reverse voltage is applied across the primary side of the transformer T1. Therefore, the parasitic capacitance Cds, the inductance Lp of the primary winding of the transformer T1, and its leakage inductance Lk start to resonate. During the resonance period, the drain voltage of the MOS transistor Q1 gradually decreases. Part of the energy stored in the parasitic capacitance Cds will be transferred to the secondary side, and the other part of the energy will return to the input power supply until the resonance ends, and the drain voltage stabilizes to the sum of the DC pulsating voltage VIN and the converter secondary reflected voltage Vor.

[0050] For easy understanding, the waveform voltage of the spike end Uds when the MOS transistor Q1 is turned off is anatomically analyzed as Figure 2 shown, Vdsmax = Vinmax + Vor + Vspike,

[0051] where Vds is the voltage between the D and S terminals of the MOS transistor Q1; VIN is the DC pulsating voltage; Vor is the transformer secondary reflected voltage; Vspike is the spike voltage caused by the primary leakage inductance of the transformer.

[0052] It can be seen that the embodiments of the present application optimize the parameters on the basis of the traditional RCD, so as to adjust the resistance based on the RDC clamping circuit. Since both the capacitor and the resistor need to be properly selected, if the peak voltage is relatively large, the voltage stress on the capacitor is large. Under the condition of meeting the function of the clamping circuit, the capacitance value of the capacitor can be increased, so as to reduce the peak voltage. At the same time, the resistance value of the clamping circuit needs to be adjusted so that when the switching circuit is turned on, the voltage across the capacitor drops to be close to the reflected voltage of the secondary side of the transformer. Then the capacitor continues to discharge to the resistor until the switching transistor is turned on again, so as to realize a low-cost anti-surge RDC clamping circuit, which can ensure the stable and safe operation of the subsequent circuit.

[0053] For the switching power supply circuit of a vehicle according to an embodiment of the present application, the input end of the RDC clamping circuit is used to input a DC pulsating voltage, the output end is connected to the input end of the transformer component, the output end of the transformer component is connected to the input end of the filtering circuit, the output end of the filtering circuit is connected to the load circuit, the control end of the switching circuit is connected to the control signal output end, and the first end and the second end of the switching circuit are connected to the ground node. Thus, the problems in the switching power supply circuit in the related art, such as insufficient suppression of voltage spikes due to transformer leakage inductance, strong electromagnetic interference being caused, and energy consumption being affected, are solved. By optimizing the capacitor and resistor parameters and combining dynamic energy management, the voltage spike when the switching transistor is turned off is effectively suppressed, the electromagnetic interference is reduced, and the circuit reliability is improved.

[0054] An embodiment of the present application further provides a vehicle, which includes the above-mentioned switching power supply circuit.

[0055] For the vehicle according to an embodiment of the present application, the input end of the RDC clamping circuit is used to input a DC pulsating voltage, the output end is connected to the input end of the transformer component, the output end of the transformer component is connected to the input end of the filtering circuit, the output end of the filtering circuit is connected to the load circuit, the control end of the switching circuit is connected to the control signal output end, and the first end and the second end of the switching circuit are connected to the ground node. Thus, the problems in the switching power supply circuit in the related art, such as insufficient suppression of voltage spikes due to transformer leakage inductance, strong electromagnetic interference being caused, and energy consumption being affected, are solved. By optimizing the capacitor and resistor parameters and combining dynamic energy management, the voltage spike when the switching transistor is turned off is effectively suppressed, the electromagnetic interference is reduced, and the circuit reliability is improved.

[0056] In the description of this specification, the descriptions with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or N embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0057] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of this application, the meaning of "N" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0058] Any process or method description shown in the flowchart or described in other ways herein can be understood as representing a module, segment, or part of code including one or more N executable instructions for implementing a customized logic function or process, and the scope of the preferred embodiments of this application includes additional implementations, where the functions can be executed in a substantially simultaneous manner or in the reverse order according to the functions involved, rather than in the order shown or discussed, which should be understood by those skilled in the art to which the embodiments of this application pertain.

[0059] The logic and / or steps represented in the flowchart or otherwise described herein can, for example, be considered as a definite sequence list of executable instructions for implementing logical functions, and can be embodied specifically in any computer-readable medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other systems that can fetch instructions from the instruction execution system, apparatus, or device and execute the instructions), or in conjunction with these instruction execution systems, apparatuses, or devices. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by or in conjunction with an instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection portion (electronic device) having one or N wirings, a portable computer diskette (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium can even be paper or other suitable media on which a program can be printed, as the program can be obtained electronically, for example, by optically scanning the paper or other media, followed by editing, interpretation, or other suitable processing as necessary, and then stored in a computer memory.

[0060] It should be understood that various parts of the present application can be implemented by hardware, software, firmware, or a combination thereof. In the above-described embodiments, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application-specific integrated circuits having appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

[0061] Those of ordinary skill in the art of this technology can understand that all or part of the steps carried by the method of the above embodiments can be completed by a program instructing relevant hardware, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiments.

[0062] In addition, each functional unit in various embodiments of the present application may be integrated into one processing module, may exist separately as individual physical units, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. When the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0063] The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disc, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present application.

Claims

1. A switching power supply circuit for a vehicle, characterized in that, Comprising: An RDC clamping circuit, a transformer component, a filtering circuit, and a switching circuit, wherein The input end of the RDC clamping circuit is used to input a DC pulsating voltage, and the output end of the RDC clamping circuit is connected to the input end of the transformer component; The output end of the transformer component is connected to the input end of the filtering circuit; The output end of the filtering circuit is connected to a load circuit; The control end of the switching circuit is connected to a control signal output end, the first end of the switching circuit and the second end of the switching circuit are connected to a ground node; Wherein, when the switching circuit is in an off state, the leakage inductance energy generated by the transformer component is absorbed through the RDC clamping circuit.

2. The switching power supply circuit of a vehicle according to claim 1, characterized in that The RDC clamping circuit includes: A first resistor, one end of the first resistor is respectively connected to the output end of the DC pulsating voltage and the first end of the input end of the transformer component; A first capacitor, one end of the first capacitor is connected to the connection node between one end of the first resistor and the first end of the input end of the transformer component; A first diode, the cathode of the first diode is respectively connected to the other end of the first resistor and the other end of the first capacitor, and the other end of the first diode is connected to the connection node between the second end of the input end of the transformer component and the switching circuit.

3. The switching power supply circuit of a vehicle according to claim 2, wherein, The filtering circuit includes: A second diode, the anode of the second diode is connected to the first end of the output end of the transformer component, and the cathode of the second diode is connected to the positive pole of the output end of the switching power supply circuit; A filtering capacitor, the positive pole of the filtering capacitor is connected to the connection node between the cathode of the second diode and the positive pole of the output end of the switching power supply circuit, and the negative pole of the filtering capacitor is respectively connected to the second end of the output end of the transformer component and the negative pole of the output end of the switching power supply circuit.

4. The switching power supply circuit of the vehicle according to claim 3, characterized in that, The transformer component includes: a transformer and the leakage inductance of the transformer and the primary winding inductance of the transformer generated by the transformer, wherein One end of the leakage inductance of the transformer is connected to one end of the first capacitor, and the other end of the leakage inductance of the transformer is connected to the first end of the primary side of the transformer; One end of the primary winding inductance of the transformer is connected to the first end of the primary side of the transformer, and the other end of the primary winding inductance of the transformer is connected to the second end of the primary side of the transformer.

5. The switching power supply circuit of a vehicle according to claim 4, characterized in that, The switching circuit includes: a MOS transistor and the parasitic capacitance generated by the MOS transistor, wherein The gate of the MOS transistor is connected to the control signal output end, the source of the MOS transistor is connected to the second end of the primary side of the transformer, and the drain of the MOS transistor is connected to the ground node.

6. The switching power supply circuit of a vehicle according to claim 5, characterized in that, The MOS transistor is a PMOS transistor.

7. The switching power supply circuit of the vehicle according to claim 2, wherein Determine the capacitance value of the first capacitor and the resistance value of the first resistor according to the voltage peak value when the switching circuit is in the off state.

8. A vehicle, characterized in that, Comprising: The switching power supply circuit of the vehicle according to any one of claims 1-7.

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