Auxiliary power supply device, charger and vehicle

Abstract

The utility model discloses an auxiliary power supply device, a charger and a vehicle. The auxiliary power supply device comprises a power supply; one end of the voltage transformation input side of the voltage transformation module is connected with the power supply, and the voltage transformation output side of the voltage transformation module is connected with the power supply end of the isolation driving module; the input end of the switch module is connected with the other end of the transformation input side, the output end of the switch module is grounded, and the control end of the switch module is connected with the signal output end of the control module. According to the invention, the control of the switch module of the auxiliary power supply is realized by using the abundant interfaces of the original control module of the charger, a flyback power supply control chip does not need to be configured, and the cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of new energy vehicles, in particular to an auxiliary power supply device, a charging machine and a vehicle. BACKGROUND

[0002] In recent years, with the development of new energy technology, clean energy, energy storage industry and new energy vehicle industry have applied a large number of high-voltage and high-current power supply technology products, such as charging machines, especially vehicle-mounted charging machines, which require small size, integration, high power density and low cost. The vehicle-mounted charging machine is one of the key components in new energy vehicles such as electric vehicles and plug-in hybrid electric vehicles. Its main function is to convert alternating current from the power grid into direct current to charge the power battery pack of the vehicle.

[0003] In the related art, the auxiliary power supply part of the charging machine needs to be configured with a dedicated flyback power supply control chip and a switching module, a transformer, to form an auxiliary power supply, to supply power to the isolation drive of each of the charging machine, such as the isolation drive module of the power switch module in the power factor correction (PFC) circuit, the coupled inductor LLC (CLLC) topology circuit and the high-voltage direct current to low-voltage direct current (DC-DC) circuit.

[0004] In the related art, the charging machine mainly has the following problems: the auxiliary power supply of the charging machine needs to be configured with a dedicated flyback power supply control chip, which is high in cost. CONTENT OF THE INVENTION

[0005] The present application provides an auxiliary power supply device, a charging machine and a vehicle, which do not need to be configured with a flyback power supply control chip, and can reduce the cost.

[0006] According to the auxiliary power supply device of the first aspect of the present application, the auxiliary power supply device is applied to a charging machine, the charging machine further comprises a control module and an isolation drive module, and the auxiliary power supply device comprises:

[0007] a power supply;

[0008] a transformer module, one end of a transformer input side of the transformer module is connected with the power supply, and a transformer output side of the transformer module is connected with a power supply end of the isolation drive module;

[0009] a switching module, an input end of the switching module is connected with the other end of the transformer input side, an output end of the switching module is grounded, and a control end of the switching module is connected with a signal output end of the control module.

[0010] According to some embodiments of the present application, the auxiliary power supply device further comprises:

[0011] An over-current protection unit, an input end of the over-current protection unit is configured to acquire a current on an input side of the transformer module, and an output end of the over-current protection unit is connected to a control end of the switch module to perform current limiting control when over-current occurs.

[0012] According to some embodiments of the present application, the over-current protection unit comprises:

[0013] A current sampling unit, configured to acquire a current on an input side of the transformer module;

[0014] A current limiting threshold unit, configured to output a current limiting threshold;

[0015] A first operational amplifier, the current sampling unit is connected to an inverting end of the first operational amplifier, and the current limiting threshold unit is connected to a non-inverting end of the first operational amplifier;

[0016] An AND gate, one input end of the AND gate is connected to an output end of the first operational amplifier, another input end of the AND gate is connected to a signal output end of the control module, and an output end of the AND gate is connected to a gate of the switch module.

[0017] According to some embodiments of the present application, the current sampling unit comprises:

[0018] A second operational amplifier, an output end of the switch module is connected to ground through a first resistor, the first resistor and a common end of the switch module are connected to a non-inverting end of the second operational amplifier, an inverting end of the second operational amplifier is connected to an output end of the second operational amplifier through a second resistor, and the output end of the second operational amplifier is connected to an inverting end of the first operational amplifier.

[0019] According to some embodiments of the present application, the current limiting threshold unit comprises:

[0020] A third resistor and a fourth resistor, a positive pole of the power supply is connected to ground through the third resistor and the fourth resistor connected in series, and a common end of the third resistor and the fourth resistor is connected to a non-inverting end of the first operational amplifier.

[0021] According to some embodiments of the present application, further comprising a current sampling unit, the current sampling unit is configured to acquire a current on an input side of the transformer module, and an output end of the current sampling unit is connected to a current sampling end of the control module.

[0022] According to some embodiments of the present application, further comprising a voltage sampling unit, the voltage sampling unit is configured to acquire a voltage on an output side of the transformer module, and an output end of the voltage sampling unit is connected to a voltage sampling end of the control module.

[0023] The charger according to the second aspect of the present application comprises:

[0024] a control module;

[0025] an isolation driving module, wherein the control module is connected to a control end of the isolation driving module;

[0026] an AC-DC conversion module, wherein an input end of the AC-DC conversion module is configured to input an AC power, a high-voltage output end of the AC-DC conversion module is configured to output a high-voltage DC power, and the isolation driving module is connected to the AC-DC conversion module; and

[0027] The auxiliary power supply device according to the first aspect of the present application, wherein a low-voltage output end of the AC-DC conversion module is connected to the power supply.

[0028] According to some embodiments of the present application, the AC-DC conversion module comprises:

[0029] an AC input filter circuit;

[0030] a power factor correction circuit, wherein an output end of the AC input filter circuit is connected to an input end of the power factor correction circuit;

[0031] a resonant power conversion circuit, wherein an output end of the power factor correction circuit is connected to an input end of the resonant power conversion circuit;

[0032] a high-voltage to low-voltage circuit, wherein an output end of the resonant power conversion circuit is connected to an input end of the high-voltage to low-voltage circuit, and an output end of the high-voltage to low-voltage circuit is connected to the power supply.

[0033] The vehicle according to the third aspect of the present application comprises the charger according to the second aspect of the present application.

[0034] The auxiliary power supply device, the charger and the vehicle according to the embodiments of the present application have at least the following beneficial effects:

[0035] In the embodiments of the present application, the power supply converts the low-voltage power supply into different voltages to supply power to the isolation driving module through the voltage conversion module, and the control module of the charger realizes the output control of the voltage conversion module through the control of the switch module. The present application utilizes the rich interface of the original control module of the charger to realize the switch module control of the auxiliary power supply, and does not need to configure a flyback power supply control chip, thereby reducing the cost.

[0036] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0037] The present application will be further described below in conjunction with the drawings and embodiments, wherein:

[0038] Figure 1 A schematic diagram of the auxiliary power supply device provided in the present application is shown in FIG. 1.

[0039] Figure 2 A circuit diagram of the auxiliary power supply device provided in the present application is shown in FIG. 2.

[0040] Figure 3 A schematic diagram of the charger provided in the present application is shown in FIG. 3.

[0041] Figure 4 A circuit diagram of the AC input filter circuit in the charger provided in the present application is shown in FIG. 4.

[0042] Figure 5 A circuit diagram of the power factor correction circuit in the charger provided in the present application is shown in FIG. 5.

[0043] Figure 6 A circuit diagram of the resonant power conversion circuit in the charger provided in the present application is shown in FIG. 6.

[0044] Reference Signs List:

[0045] The control module 110, the isolation driving module 120, the AC / DC conversion module 130, the AC input filter circuit 131, the power factor correction circuit 132, the resonant power conversion circuit 133, the high-to-low voltage conversion circuit 134, the power supply 210, the voltage transformation module 220, the switch module 230, and the overcurrent protection unit 240. DETAILED DESCRIPTION

[0046] The embodiments of the present application are described in detail below with reference to the accompanying drawings. The embodiments described below are examples for explaining the present application and should not be understood as limiting the present application.

[0047] In the description of the present application, it should be understood that the positional description, such as the up, down, etc. is based on the positional relationship shown in the drawings and is only for the purpose of describing the present application and simplifying the description, and therefore should not be understood as indicating or implying that the device or element indicated must have a specific position, be constructed and operated in a specific position, and therefore should not be understood as limiting the present application.

[0048] In the description of the present application, the plural refers to two or more. If there is a description of the first, second, etc., it is only for the purpose of distinguishing technical features, and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the sequence of technical features indicated.

[0049] In the description of the present application, unless otherwise explicitly defined, the words such as setting, installing, connecting and the like should be understood in a broad sense, and the person skilled in the art can determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0050] To solve the problems in the prior art, the embodiments of the present application provide an auxiliary power supply device, a charging machine and a vehicle. First, the auxiliary power supply device provided by the embodiments of the present application is introduced.

[0051] Reference Figure 1 As shown in the figure, the first aspect of the present application relates to an auxiliary power supply device, which is applied to a charging machine, and the charging machine further includes a control module 110 and an isolation driving module 120. The auxiliary power supply device includes a power supply 210, a voltage conversion module 220 and a switch module 230. One end of the voltage conversion input side of the voltage conversion module 220 is connected with the power supply 210, and the voltage conversion output side of the voltage conversion module 220 is connected with the power supply end of the isolation driving module 120. The input end of the switch module 230 is connected with the other end of the voltage conversion input side, the output end of the switch module 230 is grounded, and the control end of the switch module 230 is connected with the signal output end of the control module 110.

[0052] In the embodiments of the present application, the power supply 210 converts the low-voltage power supply 210 into different voltages through the voltage conversion module 220 to supply power to the isolation driving module 120, and the control module 110 of the charging machine controls the output of the voltage conversion module 220 by controlling the switch module 230. The present application utilizes the surplus interface of the original control module 110 of the charging machine to realize the control of the switch module 230 of the auxiliary power supply, without the need to configure a flyback power supply control chip, thereby reducing the cost.

[0053] It should be noted that the above-mentioned control module 110 refers to the original control module 110 in the charging machine, for example, the control module 110 of the isolation driving module 120, that is, the control module 110 is connected with the control end of the isolation driving module 120. The control module 110 can be a single control chip, such as a microcontroller unit (MCU), a digital signal processor (DSP) or a field programmable gate array (FPGA), etc. It can also be a control module 110 composed of different chip combinations, such as an MCU / DSP module composed of MCU and DSP.

[0054] The isolation drive module 120 refers to the isolation drive module 120 of the power switch tube in the AC-DC related circuit in the charger, for example, the isolation drive module 120 of the power switch module 230 in the PFC circuit, the CLLC topology circuit, and the DC-DC circuit. The control module 110 controls the on-off of the corresponding power switch tube through the isolation drive module 120 to realize the isolation drive control of the AC-DC related circuit.

[0055] The power supply 210 refers to a power supply 210 providing low-voltage DC input, for example, a battery or an output terminal of a DC-DC circuit. One end of the transformer input side of the transformer module 220 is connected to the power supply 210, so that the primary side of the transformer module 220 is input with low-voltage DC power from the power supply 210.

[0056] The transformer module 220 refers to a multi-output transformer. Since the isolation drive module 120 needs a low-voltage DC power supply, different isolation drive modules 120 require different power supply voltages, and isolation is required between the high-voltage side and the low-voltage side of the isolation drive module 120. Therefore, the single low-voltage power supply 210 needs to be converted into multiple different voltage outputs by the transformer module 220 to supply power to different isolation drive modules 120. The transformer input side of the transformer module 220 refers to the primary side of the transformer, and the transformer output side of the transformer module 220 refers to the secondary side of the transformer. It should be understood that the transformer module 220 has one primary side and multiple secondary sides, so that the single low-voltage power supply 210 is converted into multiple different voltage outputs to supply power to different isolation drive modules 120.

[0057] The switch module 230 refers to a switching device such as a MOS tube, an IGBT module, etc. The input end of the switch module 230 is connected to the other end of the transformer input side, the output end of the switch module 230 is grounded, and the control end of the switch module 230 is connected to the signal output end of the control module 110. Therefore, the control module 110 can control the output current of the transformer module 220 by controlling the conduction degree of the switch module 230.

[0058] Since the control module 110 in the application is the original control module 110 in the charger, a separate flyback power supply control chip does not need to be set. It should be understood that during the selection of the control chip for the design of the application product, there is often a situation that the controller hardware peripherals such as the PWM output port and the ADC port and the calculation resources are rich. If these hardware resources are not utilized, it will cause waste of resources. In the application, the control of the switch module 230 is changed from the independent flyback power supply control chip to the direct control of the original control module 110 in the charger, which reduces the cost.

[0059] In some embodiments, the auxiliary power supply device can further include:

[0060] The input end of the overcurrent protection unit 240 is configured to acquire the transformer input side current of the transformer module 220, and the output end of the overcurrent protection unit 240 is connected to the control end of the switch module 230 to perform current limiting control when overcurrent occurs.

[0061] In the embodiment, the auxiliary power supply device is further provided with the overcurrent protection unit 240, which acquires the transformer input side current of the transformer module 220 and performs current limiting control on the switch module 230 when overcurrent protection occurs, so as to prevent abnormal conditions from burning the material and improve the reliability and safety of the circuit.

[0062] The transformer input side current of the transformer module 220 refers to the primary current of the transformer. Since the transformer input side of the transformer module 220 is grounded through the switch module 230, the transformer input side current of the transformer module 220 is equal to the current flowing through the switch module 230. The overcurrent protection unit 240 can acquire the current flowing through the switch module 230 by means of current sampling, determine whether overcurrent occurs according to the transformer input side current, and control the switch module 230 to perform overcurrent protection shutdown when overcurrent occurs.

[0063] In some embodiments, the overcurrent protection unit 240 can include:

[0064] a current sampling unit configured to acquire the transformer input side current of the transformer module 220;

[0065] a current limiting threshold unit configured to output a current limiting threshold;

[0066] a first operational amplifier, the current sampling unit being connected to the inverting terminal of the first operational amplifier, and the current limiting threshold unit being connected to the non-inverting terminal of the first operational amplifier;

[0067] an AND gate, one input end of the AND gate being connected to the output end of the first operational amplifier, the other input end of the AND gate being connected to the signal output end of the control module 110, and the output end of the AND gate being connected to the gate electrode of the switch module 230.

[0068] In the embodiment, the overcurrent protection unit 240 is composed of the current sampling unit, the current limiting threshold unit, the first operational amplifier and the AND gate. The use of the operational amplifier for overcurrent shutdown protection can reduce the calculation load of the control module 110.

[0069] The current sampling unit converts the primary side current of the transformer into a voltage value and feeds back to the inverting terminal of the first operational amplifier. The current can be directly converted into a voltage value by the current sampling resistor and input to the inverting terminal of the first operational amplifier. Alternatively, the voltage of the current sampling resistor can be amplified by an amplifier and input to the inverting terminal of the first operational amplifier. The first operational amplifier serves as a comparator to compare the primary side current value of the transformer with the current limiting threshold value, and finally controls the conduction of the switch module 230. Taking the MOS switch module 230 as an example, the output of the first operational amplifier and the output of the control module 110 control the PWM signal to perform AND logic to finally control the flyback of the MOS. If the current is too large, the first operational amplifier outputs a low level, which reduces the PWM duty cycle of the PWM flyback to achieve the purpose of current limiting.

[0070] In some embodiments, the current sampling unit can include:

[0071] The output end of the second operational amplifier is connected to the inverting terminal of the first operational amplifier.

[0072] In this embodiment, the current sampling unit is composed of the second operational amplifier, the first resistor and the second resistor, which can accurately obtain the input side current of the transformer module 220 and improve the accuracy of the overcurrent protection.

[0073] The output end of the switch module 230 is connected to the ground through the first resistor, so the first resistor is a current sampling resistor, and the current of the first resistor is equal to the input side current of the switch module 230 and the transformer module 220. The voltage value of the current sampling resistor is amplified by the second operational amplifier and input to the first operational amplifier for comparison with the current limiting threshold value, which can improve the accuracy of overcurrent protection detection.

[0074] It should be noted that, in addition to the above circuit connection mode, the inverting terminal of the second operational amplifier can also be directly connected to the ground, which is equivalent to connecting the non-inverting terminal and the inverting terminal of the second operational amplifier to the two ends of the current sampling resistor, respectively.

[0075] In some embodiments, the current limiting threshold unit can include:

[0076] The positive pole of the power supply 210 is connected to the ground through the third resistor and the fourth resistor connected in series, and the common end of the third resistor and the fourth resistor is connected to the non-inverting terminal of the first operational amplifier.

[0077] In this embodiment, the common end voltage of the third resistor and the fourth resistor is used as the preset current limiting threshold value, which has a simple structure and low cost.

[0078] The positive pole of the power supply 210 is connected to the ground through the third resistor and the fourth resistor in series, which means that a voltage threshold of the preset current limiting current is obtained by the common end voltage of the third resistor and the fourth resistor through the voltage dividing circuit, and the size of the current limiting threshold can be changed by adjusting the resistance value of the fourth resistor.

[0079] It should be noted that, in addition to using a voltage dividing circuit as a current limiting threshold unit, a reference voltage output by the control module 110 can be input to the non-inverting terminal of the first operational amplifier as a current limiting threshold.

[0080] In some embodiments, a current sampling unit is further included, which is configured to obtain the voltage input side current of the voltage conversion module 220, and the output end of the current sampling unit is connected to the current sampling end of the control module 110.

[0081] In this embodiment, the voltage input side current of the voltage conversion module 220 is input to the control module 110 through the current sampling unit, and the control module 110 performs overcurrent detection according to the sampling current and the preset current limiting threshold, which can improve the accuracy of overcurrent protection detection.

[0082] The output end of the current sampling unit is connected to the current sampling end of the control module 110, which means that the current loop is monitored through the ADC sampling end of the control module 110, and the current limiting threshold can be preset in the control module 110. The control module 110 compares the preset current limiting threshold with the sampling current, and controls the switch module 230 to limit the current when overcurrent is detected, so as to realize overcurrent protection.

[0083] In some embodiments, a voltage sampling unit is further included, which is configured to obtain the voltage output side voltage of the voltage conversion module 220, and the output end of the voltage sampling unit is connected to the voltage sampling end of the control module 110.

[0084] In this embodiment, the control module 110 obtains the voltage output side voltage of the voltage conversion module 220 through the voltage sampling unit, which can realize voltage feedback loop control of the flyback power supply and improve the stability of operation.

[0085] The voltage sampling unit can adopt a voltage dividing resistor, for example, the voltage sampling unit can include a fifth resistor and a sixth resistor, and the positive pole of one secondary side of the voltage conversion module 220 is connected to the ground through the fifth resistor and the sixth resistor in series, the common end of the fifth resistor and the sixth resistor is connected to the ADC end of the control module 110, and the voltage sampling is performed through the ADC end of the control module 110.

[0086] The specific circuit structure of the auxiliary power supply device of the present application is described below, with reference to Figure 2As shown, a circuit structure of an auxiliary power supply device, comprising:

[0087] 12V battery, transformer T1, MOS tube Q1, operational amplifier U1, operational amplifier U2 and AND gate AND1, the 12V battery is the power supply 210, the transformer T1 is the transformer module 220, the MOS tube Q1 is the switch module 230, the operational amplifier U1, the operational amplifier U2 and the AND gate AND1 are the overcurrent protection unit 240. The positive pole KL30 of the battery is connected to one end of the primary side of the transformer T1 through the diode D18, the other end of the primary side of the transformer T1 is connected to the drain of the MOS tube Q1, the source of the MOS tube Q1 is grounded through the resistor Rsense, the resistor Rsense is the first resistor, the resistor R2 is the second resistor, the resistor R3 is the third resistor, the resistor R4 is the fourth resistor, the operational amplifier U1 is the first operational amplifier, and the operational amplifier U2 is the second operational amplifier. The common end of the resistor Rsense and the MOS tube Q1 is connected to the non-inverting terminal of the operational amplifier U2, the inverting terminal of the operational amplifier U2 is connected to the output terminal of the operational amplifier U2 through the resistor R2, the output terminal of the operational amplifier U2 is connected to the inverting terminal of the operational amplifier U1 through the resistor R5, the inverting terminal of the operational amplifier U1 is grounded through the capacitor C1, one end of the primary side of the transformer T1 is grounded through the resistor R3 and the resistor R4 connected in series, the common end of the resistor R3 and the resistor R4 is connected to the non-inverting terminal of the operational amplifier U1, the output terminal of the operational amplifier U1 is connected to one input terminal of the AND gate AND1, the DRIVE end of the DSP2 / MCU2 is connected to the other input terminal of the AND gate AND1, and the output terminal of the AND gate AND1 is connected to the gate of the MOS tube Q1.

[0088] In the embodiment, the transformer T1 has multiple secondary sides, which convert 12V direct current into different voltages to supply power to different isolated drive modules 120, for example, the first secondary side outputs 15V direct current to supply power to the DC-DC primary side isolated drive module 120 and the CLLC secondary side isolated drive module 120, the second secondary side outputs 20V direct current to supply power to the PFC power tube high side isolated drive module 120, the third secondary side outputs 20V direct current to supply power to the PFC power tube low side isolated drive module 120, the fourth secondary side outputs 15V direct current to supply power to the PFC power tube slow tube isolated drive module 120 and the LLC primary side power tube isolated drive module 120, the fifth secondary side outputs 12V direct current to supply power to the DSP and the DC-DC primary side power tube isolated drive module 120, and the sixth secondary side outputs direct current to supply power to the MCU and the DC-DC secondary side power tube isolated drive module 120.

[0089] Wherein, the resistance Rfbt is the fifth resistance, the resistance Rfbb is the sixth resistance, the positive electrode of the sixth secondary side of the transformer T1 is grounded through the resistance Rfbt and the resistance Rfbb connected in series, and the common end of the resistance Rfbt and the resistance Rfbb is connected to the ADC end of the DSP2 / MCU2.

[0090] In the embodiment, the operational amplifier U2 amplifies the voltage of the resistance Rsense as a current sampling resistance and inputs the voltage to the operational amplifier U1, and the operational amplifier U1 compares the voltage value IN+ (a current limiting threshold) of the preset resistance R4 as a comparator. The output of the operational amplifier U1 and the output of the DSP2 / MCU2 control the PWM signal to do the AND logic to finally control the flyback of the MOS tube Q1. When overcurrent occurs, the operational amplifier U1 outputs a low level, reduces the PWM flyback PWM duty cycle, and achieves the purpose of current limiting.

[0091] Reference Figure 3 As shown in the second aspect of the application, the second aspect of the application also relates to a charger, comprising:

[0092] The control module 110;

[0093] The isolation driving module 120, the control end of the isolation driving module 120 being connected to the control module 110;

[0094] The AC-DC conversion module 130, the input end of the AC-DC conversion module 130 being used for inputting the AC power supply 210, the high-voltage output end of the AC-DC conversion module 130 being used for outputting the high-voltage DC power supply, and the isolation driving module 120 being connected to the AC-DC conversion module 130; and

[0095] The auxiliary power supply device 200 as described above, the low-voltage output end of the AC-DC conversion module 130 being connected to the power supply 210.

[0096] The second aspect of the application discloses a charger, which is provided with the auxiliary power supply device 200 as described in the first aspect of the application.

[0097] As can be seen, the charger of the second aspect of the application, the power supply 210 converts the low-voltage power supply 210 into different voltages through the transformer module 220 to supply power to the isolation driving module 120, and the control module 110 of the charger controls the output of the transformer module 220 through the control of the switching module 230. The application utilizes the surplus interface of the original control module 110 of the charger to realize the control of the switching module 230 of the auxiliary power supply, and does not need to configure a flyback power supply control chip, thereby reducing the cost.

[0098] In this embodiment, the AC-DC conversion module 130 can include one or more conversion circuits, and each conversion circuit requiring isolation is provided with an isolation driving module 120. The high-voltage output end of the AC-DC conversion module 130 charges the vehicle battery, and the low-voltage output end charges the storage battery or directly serves as the power supply 210 of the auxiliary power supply device 200.

[0099] In some embodiments, with reference to Figures 4 to 6 As shown in the figure, the AC-DC conversion module 130 can include:

[0100] an AC input filter circuit 131;

[0101] a power factor correction circuit 132, the output end of the AC input filter circuit 131 being connected to the input end of the power factor correction circuit 132;

[0102] a resonant power conversion circuit 133, the output end of the power factor correction circuit 132 being connected to the input end of the resonant power conversion circuit 133;

[0103] a high-to-low voltage circuit 134, the output end of the resonant power conversion circuit 133 being connected to the input end of the high-to-low voltage circuit 134, and the output end of the high-to-low voltage circuit 134 being connected to the power supply 210.

[0104] In this embodiment, the AC-DC conversion module 130 is composed of the AC input filter circuit 131, the power factor correction circuit 132, the resonant power conversion circuit 133, and the high-to-low voltage circuit 134, so that stable high-voltage DC power and low-voltage DC power can be output, and the reliability is improved.

[0105] It should be noted that in this embodiment, the AC input filter circuit 131 adopts single-phase AC power input, and of course, three-phase AC power input can also be adopted. When the AC input filter circuit 131 adopts three-phase input, the power factor correction circuit 132 also needs to be replaced with a three-phase input PFC circuit.

[0106] The resonant power conversion circuit 133 can adopt a CLLC circuit or a DAB circuit to convert the input single-phase or three-phase AC into high-voltage DC.

[0107] The third aspect of the application also relates to a vehicle including the charging machine described in the second aspect.

[0108] In this embodiment, the vehicle can be any new energy vehicle equipped with the charging machine, such as a hybrid vehicle, an electric vehicle, etc. Specifically, the vehicle can be a private car, such as a sedan, an SUV, an MPV, or a pickup truck, etc. The vehicle can also be a commercial vehicle, such as a van, a bus, a small truck, or a large trailer truck, etc.

[0109] The above merely describes a specific implementation of the present application. Those skilled in the art can clearly understand the specific working processes of the system, modules and units described above for the convenience and brevity of description, and can refer to the corresponding processes in the foregoing method embodiments, which will not be described herein again. It should be understood that the protection scope of the present application is not limited to this, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered within the protection scope of the present application.

Claims

1. An auxiliary power supply device, characterized by comprising: The application is applied to a charger, the charger further comprises a control module and an isolation driving module, and the auxiliary power supply device comprises: a power supply; a voltage transformation module, one end of a voltage transformation input side of the voltage transformation module is connected with the power supply, and a voltage transformation output side of the voltage transformation module is connected with a power supply end of the isolation driving module; a switch module, an input end of the switch module is connected with the other end of the voltage transformation input side, an output end of the switch module is grounded, and a control end of the switch module is connected with a signal output end of the control module.

2. The auxiliary power supply device according to claim 1, characterized by Further comprising: an overcurrent protection unit, an input end of the overcurrent protection unit is used for acquiring a voltage transformation input side current of the voltage transformation module, and an output end of the overcurrent protection unit is connected with the control end of the switch module for current limiting control when overcurrent occurs.

3. The auxiliary power supply device according to claim 2, characterized by The overcurrent protection unit comprises: a current sampling unit, used for acquiring the voltage transformation input side current of the voltage transformation module; a current limiting threshold unit, used for outputting a current limiting threshold; a first operational amplifier, the current sampling unit is connected with an inverting end of the first operational amplifier, and the current limiting threshold unit is connected with a non-inverting end of the first operational amplifier; an AND gate, an output end of the first operational amplifier is connected with one input end of the AND gate, a signal output end of the control module is connected with the other input end of the AND gate, and an output end of the AND gate is connected with a gate of the switch module.

4. The auxiliary power supply device according to claim 3, characterized by The current sampling unit comprises: a second operational amplifier, an output end of the switch module is grounded through a first resistor, the first resistor is connected with a common end of the switch module and a non-inverting end of the second operational amplifier, a second resistor is connected with an inverting end of the second operational amplifier and an output end of the second operational amplifier, and the output end of the second operational amplifier is connected with the inverting end of the first operational amplifier.

5. The auxiliary power supply device according to claim 3, characterized by The current limiting threshold unit comprises: a third resistor and a fourth resistor, a positive pole of the power supply is grounded through the third resistor and the fourth resistor connected in series, and a common end of the third resistor and the fourth resistor is connected with the non-inverting end of the first operational amplifier.

6. The auxiliary power supply device of claim 1, wherein Further comprising a current sampling unit, the current sampling unit is used for acquiring the voltage transformation input side current of the voltage transformation module, and an output end of the current sampling unit is connected with a current sampling end of the control module.

7. The auxiliary power supply device of claim 1, wherein Further comprising a voltage sampling unit, the voltage sampling unit is used for acquiring a voltage transformation output side voltage of the voltage transformation module, and an output end of the voltage sampling unit is connected with a voltage sampling end of the control module.

8. A charger characterized by comprising: Comprise: a control module; an isolation driving module, the control module is connected with a control end of the isolation driving module; an AC / DC conversion module, an input end of the AC / DC conversion module is used for inputting an AC power supply, a high-voltage output end of the AC / DC conversion module is used for outputting a high-voltage DC power supply, and the isolation driving module is connected with the AC / DC conversion module; and The auxiliary power supply device according to any one of claims 1 to 5, a low-voltage output end of the AC / DC conversion module is connected with the power supply.

9. The charger of claim 8, wherein, The AC / DC conversion module comprises: an AC input filter circuit; a power factor correction circuit, an output end of the AC input filter circuit is connected with an input end of the power factor correction circuit; a resonant power conversion circuit, an output terminal of the power factor correction circuit being connected to an input terminal of the resonant power conversion circuit; a high-to-low voltage conversion circuit, an output terminal of the resonant power conversion circuit being connected to an input terminal of the high-to-low voltage conversion circuit, an output terminal of the high-to-low voltage conversion circuit being connected to the power supply.

10. A vehicle characterized by comprising: a charger comprising the charger according to claim 8 or 9.

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