OBC charging circuit, DCDC converter and vehicle

Abstract

The utility model relates to the technical field of vehicle-mounted charging, in particular to an OBC charging circuit, a DCDC converter and a vehicle, the OBC charging circuit comprises an anti-reversion circuit and a rectification circuit, one end of the anti-reversion circuit is connected with the positive electrode of an electric pile, and the other end of the anti-reversion circuit is connected with the input end of a voltage conversion circuit; one end of the rectifying circuit is connected with an alternating current input connector of the DC and connected to a whole vehicle alternating current charging interface, the alternating current interface can be single-phase or three-phase, and the other end of the rectifying circuit is connected with a direct current bus at the input end of the DC. Therefore, the problems of waste of hardware resources, waste of arrangement space of the whole vehicle and the like caused by the fact that the OBC charger and the fuel cell are independent module individuals are solved, the OBC charging function and the fuel cell voltage conversion function are achieved, the cost of parts of the whole vehicle is saved, and the arrangement space of the whole vehicle is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle-mounted charging, in particular to an OBC charging circuit, a DCDC converter and a vehicle. Background Art

[0002] In recent years, the global energy crisis and environmental pollution have been intensifying. PEMFC (Proton Exchange Membrane Fuel Cell) is receiving more and more attention and research, and is considered to be the ultimate form of new energy for vehicles. As new energy vehicles become more and more versatile, their electronic and electrical architecture is becoming more and more complicated, and high integration has become the current trend of electronic and electrical architecture.

[0003] In the related art, the OBC (On Board Charger) charger and fuel cell of a fuel cell vehicle are independent modules, which wastes hardware resources and the layout space of the entire vehicle, and needs to be solved urgently. Utility Model Content

[0004] The utility model provides an OBC charging circuit, a DCDC converter and a vehicle, so as to solve the problems of waste of hardware resources and waste of whole vehicle layout space caused by the OBC charger and the fuel cell being independent module individuals, realize the OBC charging function and the fuel cell voltage conversion function, and save the cost of whole vehicle parts and save the whole vehicle layout space.

[0005] The first embodiment of the utility model provides an OBC charging circuit, comprising:

[0006] An anti-reverse circuit, one end of which is connected to the positive electrode of the battery stack, and the other end of which is connected to the input end of the voltage conversion circuit;

[0007] A rectifier circuit, one end of which is connected to the AC charging interface of the vehicle through an AC input plug-in, and the other end of which is connected to the DC (Direct Current) input bus.

[0008] Optionally, in some embodiments, the vehicle AC charging interface is single-phase or three-phase.

[0009] Optionally, in some embodiments, when the AC charging interface of the whole vehicle is single-phase, the first end of the rectifier circuit is connected to the negative pole of the battery stack, the second and third ends of the rectifier circuit are both connected to the AC input plug-in, and the fourth end of the rectifier circuit is respectively connected to the other end of the anti-reverse circuit and the input end of the voltage conversion circuit.

[0010] Optionally, in some embodiments, when the vehicle AC charging interface is single-phase, the rectifier circuit includes:

[0011] a first diode, wherein a cathode of the first diode is connected to a negative electrode of the battery stack, and an anode of the first diode is connected to the AC input plug-in;

[0012] a second diode, wherein a cathode of the second diode is connected to a cathode of the first diode and a negative electrode of the battery stack respectively, and an anode of the second diode is connected to the AC input plug-in;

[0013] a third diode, wherein the cathode of the third diode is connected to the anode of the second diode and the AC input plug-in, respectively, and the anode of the third diode is connected to the other end of the anti-reverse circuit and the input end of the voltage conversion circuit;

[0014] A fourth diode, wherein the cathode of the fourth diode is respectively connected to the anode of the first diode and the AC input plug-in, and the anode of the fourth diode is respectively connected to the anode of the third diode, the other end of the anti-reverse circuit and the input end of the voltage conversion circuit.

[0015] Optionally, in some embodiments, the anti-reverse circuit is a fifth diode or a relay.

[0016] Optionally, in some embodiments, the anode of the fifth diode is connected to the positive electrode of the battery stack, and the cathode of the fifth diode is connected to the fourth end of the rectifier circuit.

[0017] Optionally, in some embodiments, the relay comprises: a first switch component, a second switch component and a resistor, wherein:

[0018] The first end of the first switch component is connected to the positive electrode of the battery stack and the first end of the second switch component, and the second end of the first switch component is connected to the second end of the resistor, the input end of the voltage conversion circuit and the fourth end of the rectifier circuit;

[0019] The first end of the second switch component is connected to the positive electrode of the battery stack and the first end of the first switch component, and the second end of the second switch component is connected to the first end of the resistor;

[0020] The first end of the resistor is connected to the second end of the second switch component, and the second end of the resistor is connected to the second end of the second switch component, the input end of the voltage conversion circuit and the fourth end of the rectifier circuit.

[0021] Optionally, in some embodiments, the anti-reverse circuit and the rectifier circuit are both located in the front stage of a DCDC (Direct Current-Direct Current) converter.

[0022] A second aspect of the present invention provides a DCDC converter, comprising the OBC charging circuit as described above.

[0023] A third aspect of the present invention provides a vehicle, comprising the DCDC converter as described above.

[0024] Therefore, according to the OBC charging circuit of the utility model, one end of the anti-reverse circuit is connected to the positive electrode of the battery stack, and the other end of the anti-reverse circuit is connected to the input end of the voltage conversion circuit; the rectifier circuit is connected to the DC AC input connector and connected to the vehicle AC charging interface, which can be single-phase or three-phase, and the other end of the rectifier circuit is connected to the DC input DC bus. Therefore, the problems of waste of hardware resources and waste of vehicle layout space caused by the OBC charger and fuel cell being independent module individuals are solved, and the OBC charging function and the fuel cell voltage conversion function are realized, and the cost of vehicle parts and the layout space of the vehicle are saved.

[0025] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0027] Figure 1 A schematic diagram of an OBC charging circuit provided according to an embodiment of the utility model;

[0028] Figure 2 It is a schematic diagram of an OBC charging circuit according to a specific embodiment of the utility model;

[0029] Figure 3 is a schematic diagram of an OBC charging circuit according to another specific embodiment of the utility model;

[0030] Figure 4 A block diagram of a DCDC converter provided according to an embodiment of the utility model;

[0031] Figure 5 The present invention is a block diagram of a vehicle provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0033] The OBC charging circuit, DCDC converter and vehicle of the embodiment of the utility model are described below with reference to the accompanying drawings. In view of the problem mentioned in the above background technology that the OBC charger and the fuel cell are independent modules, which leads to the waste of hardware resources and the waste of vehicle layout space, the utility model provides an OBC charging circuit, in which one end of the anti-reverse circuit is connected to the positive pole of the battery stack, and the other end of the anti-reverse circuit is connected to the input end of the voltage conversion circuit; one end of the rectifier circuit is connected to the AC charging interface of the vehicle through the AC input plug-in, and the other end of the rectifier circuit is connected to the input end bus of the direct current DC. In this way, the problems of waste of hardware resources and waste of vehicle layout space caused by the OBC charger and the fuel cell being independent modules are solved, the OBC charging function and the fuel cell voltage conversion function are realized, and the cost of vehicle parts and the layout space of the vehicle are saved.

[0034] Specifically, Figure 1 A schematic diagram of an OBC charging circuit provided in an embodiment of the utility model.

[0035] like Figure 1 As shown, the OBC charging circuit 10 includes: an anti-reverse circuit 100 and a rectifier circuit 200 .

[0036] One end of the anti-reverse circuit 100 is connected to the positive electrode of the battery stack, and the other end of the anti-reverse circuit 100 is connected to the input end of the voltage conversion circuit;

[0037] One end of the rectifier circuit 200 is connected to the AC charging interface of the vehicle through an AC input plug-in, and the other end of the rectifier circuit is connected to the DC input bus.

[0038] Optionally, in some embodiments, the anti-reverse circuit 100 and the rectifier circuit 200 are both located in the front stage of the DCDC converter.

[0039] Specifically, the embodiment of the utility model adds an anti-reverse circuit 100 and a rectifier circuit 200 to the front stage of the DCDC converter, and shares the filter capacitor and the voltage conversion circuit with the fuel cell, so as to realize the charging function of the OBC and the voltage conversion function of the fuel cell.

[0040] It is understandable that for OBC charging function, it usually involves converting the AC power provided by the power grid into DC power; for fuel cell system, it may involve filtering out the AC component generated by the fuel cell voltage conversion to ensure that the output is stable DC power. Figure 1 As shown, the function of the rectifier circuit 200 of the embodiment of the utility model is to convert AC (Alternating Current) into DC (Direct Current) for use by the subsequent DCDC converter.

[0041] like Figure 1 As shown, the anti-reverse circuit 100 of the embodiment of the utility model is used to prevent the current from flowing in reverse, avoiding damage to the power supply or circuit. During the charging process, it can ensure that the current flows from the power grid to the battery, rather than flowing in the opposite direction. Therefore, the anti-reverse circuit 100 of the embodiment of the utility model is crucial to protecting the fuel cell and the entire circuit system.

[0042] like Figure 1 As shown, the voltage conversion circuit involved in the embodiment of the utility model has the characteristics of high temperature operation capability, high voltage resistance, high frequency characteristics and high power density. By cooperating with the DCDC converter, the voltage conversion circuit can realize the conversion of the fuel cell voltage and meet the requirements of the OBC charging function for efficient and stable power conversion.

[0043] It should be noted that the filter capacitor involved in the embodiment of the utility model is used to smooth the DC output, reduce the AC ripple, and improve the stability and efficiency of the circuit. Since the filter capacitor is used to smooth the current, it can be shared by the fuel cell and OBC charging functions to reduce system complexity and cost.

[0044] Therefore, the utility model can integrate the OBC charging function and the fuel cell voltage conversion function in the front stage of DCDC by reasonably designing and configuring the rectifier circuit, anti-reverse circuit, filter capacitor and voltage conversion circuit. This integrated design helps to improve the efficiency and reliability of the system while reducing cost and complexity.

[0045] Optionally, in some embodiments, the vehicle AC charging interface is single-phase or three-phase.

[0046] It can be understood that one end of the rectifier circuit of the embodiment of the utility model is connected to the DC AC input connector and connected to the AC charging interface of the vehicle. The AC interface can be single-phase or three-phase. That is to say, the rectifier circuit of the embodiment of the utility model can be a single-phase rectifier circuit or a three-phase rectifier circuit.

[0047] Optionally, the rectifier circuit of the embodiment of the utility model can be a single-phase rectifier circuit for 220V charging; it can also be a three-phase rectifier circuit for 380V charging; it can be a half-wave rectification, full-wave rectification, full-wave bridge rectification and voltage doubler rectification mode.

[0048] Specifically, the rectifier circuit of the embodiment of the utility model can be a single-phase rectifier circuit, which converts AC power into DC power through a rectifier device (such as a diode or a rectifier bridge). The single-phase rectifier circuit is simple, low-cost, and suitable for low-power applications. The rectifier circuit of the embodiment of the utility model can be a three-phase rectifier circuit for a three-phase AC power supply of 380V or higher voltage. The three-phase power supply has higher power and more stable voltage output than the single-phase power supply. Although the three-phase rectifier circuit is usually more complex, it can provide higher efficiency and more stable DC output.

[0049] Furthermore, the rectifier circuit of the embodiment of the utility model also has many choices in the rectification mode, such as half-wave rectification, full-wave rectification, full-wave bridge rectification and voltage doubling rectification. The embodiment of the utility model adopts the full-wave bridge rectification mode, which uses the positive and negative half cycles of the alternating current for rectification, has high efficiency and simple circuit.

[0050] It should be noted that the type of rectification circuit and rectification method of the embodiment of the utility model depend on the specific application requirements, including factors such as the required voltage, current, power, efficiency and cost, and those skilled in the art can choose according to actual needs.

[0051] Next, the utility model takes a single-phase rectifier circuit as an example to schematically illustrate the principle of the OBC charging circuit of the utility model.

[0052] Specifically, Figure 2 It is a schematic diagram of an OBC charging circuit according to a specific embodiment of the utility model.

[0053] Optionally, in some embodiments, Figure 2 As shown, when the AC charging interface of the vehicle is single-phase, the first end 1 of the rectifier circuit 200 is connected to the negative pole of the battery stack, the second end 2 and the third end 3 of the rectifier circuit 200 are both connected to the AC input plug-in, and the fourth end 4 of the rectifier circuit 200 is respectively connected to the other end of the anti-reverse circuit 100 and the input end of the voltage conversion circuit.

[0054] It is understood that a single-phase rectifier circuit processes a single-phase alternating current and usually contains a diode or a group of diodes to convert the negative half cycle of the alternating current into zero voltage and only allow the positive half cycle to pass. As a result, the output voltage or current becomes a unidirectional pulsating direct current.

[0055] Specifically, Figure 3It is a schematic diagram of an OBC charging circuit according to another specific embodiment of the utility model.

[0056] Optionally, in some embodiments, Figure 2 and Figure 3 As shown, the rectifier circuit 200 includes: a first diode 201 , a second diode 202 , a third diode 203 and a fourth diode 204 .

[0057] Among them, the cathode of the first diode 201 is connected to the negative electrode of the battery stack, and the anode of the first diode 201 is connected to the AC input plug; the cathode of the second diode 202 is respectively connected to the cathode of the first diode 201 and the negative electrode of the battery stack, and the anode of the second diode 202 is connected to the AC input plug; the cathode of the third diode 203 is respectively connected to the anode of the second diode 202 and the AC input plug, and the anode of the third diode 203 is connected to the other end of the anti-reverse circuit 100 and the input end of the voltage conversion circuit; the cathode of the fourth diode 204 is respectively connected to the anode of the first diode 201 and the AC input plug, and the anode of the fourth diode 204 is respectively connected to the anode of the third diode 203, the other end of the anti-reverse circuit 100 and the input end of the voltage conversion circuit.

[0058] Specifically, if Figure 3 As shown, in the embodiment of the utility model, the first diode 201 and the second diode 202 are connected in series to form a branch, and the third diode 203 and the fourth diode 204 are also connected in series to form another branch. The two branches are connected in parallel, and their connection points are connected to the input end of the AC power supply, and the midpoint of each branch is connected to the output end of the DC power supply.

[0059] In the actual implementation process, Figure 3 As shown, when the positive half cycle of the AC power supply arrives, the first diode 201 and the third diode 203 are turned on, while the second diode 202 and the fourth diode 204 are turned off, and the current can flow to the positive electrode of the DC power supply through the two turned-on diodes; when the negative half cycle of the AC power supply arrives, the situation is opposite, the second diode 202 and the fourth diode 204 are turned on, while the first diode 201 and the third diode 203 are turned off, and the current can flow to the negative electrode of the DC power supply through the two turned-on diodes.

[0060] It should be noted that, in the actual implementation process, the embodiment of the utility model also considers adding a filter circuit to smooth the waveform of the DC output.

[0061] Therefore, the rectifier circuit of the embodiment of the utility model can extract direct current from the alternating current power supply, and can effectively utilize the positive and negative half cycles of the alternating current.

[0062] Optionally, in some embodiments, Figure 3 As shown, the anti-reverse circuit 100 is a fifth diode 101 or a relay (not shown in the figure).

[0063] It can be understood that the embodiment of the utility model adds an anti-rebound circuit in the front stage of DCDC, that is, the anti-rebound circuit 100 of the embodiment of the utility model. The anti-rebound circuit 100 can be a relay or a diode to prevent damage to the battery stack during charging and effectively protect the components in the circuit from damage by reverse voltage or current.

[0064] Optionally, in some embodiments, Figure 2 and Figure 3 As shown, the anode of the fifth diode 101 is connected to the positive electrode of the battery stack, and the cathode of the fifth diode 101 is connected to the fourth end 4 of the rectifier circuit.

[0065] It is understandable that the diode itself has the characteristic of unidirectional conduction, which can be used to prevent the reverse connection of the power supply or battery. When the diode is connected in series in the circuit in the forward direction, if the power supply or battery is connected correctly, the diode will be turned on, allowing the load to work normally; if the power supply or battery is reversely connected, the diode is in the cut-off state, the circuit is blocked, and the safety of the load is protected.

[0066] Optionally, in some embodiments, Figure 2 and Figure 3 As shown, the relay includes: a first switch component 102 , a second switch component 103 and a resistor 104 .

[0067] Among them, the first end of the first switch component 102 is connected to the positive electrode of the battery stack and the first end of the second switch component 103, and the second end of the first switch component 102 is connected to the second end of the resistor 104, the input end of the voltage conversion circuit and the fourth end 4 of the rectifier circuit 200; the first end of the second switch component 104 is connected to the positive electrode of the battery stack and the first end of the first switch component 103, and the second end of the second switch component 103 is connected to the first end of the resistor 104; the first end of the resistor 104 is connected to the second end of the second switch component 103, and the second end of the resistor 104 is connected to the second end of the second switch component 103, the input end of the voltage conversion circuit and the fourth end 4 of the rectifier circuit 200.

[0068] It is understood by those skilled in the art that the main purpose of the anti-backlash circuit is to prevent the reverse flow of current, thereby protecting the components in the circuit from damage. As an electrical control device, the relay has the characteristic of realizing the switching function in the circuit, so it can be used to construct the anti-backlash circuit.

[0069] Specifically, if Figure 3As shown, the first switch assembly 102 and the second switch assembly 103 of the embodiment of the utility model refer to the contact system of the relay, which can be configured differently according to the type and purpose of the relay to achieve different control functions. The resistor 104 in the relay of the embodiment of the utility model is used to limit the total current in the circuit, adjust the current intensity in the circuit, and protect other components from being damaged by excessive current. It plays a key role in the relay circuit, ensuring that the relay can work normally and preventing damage caused by excessive current.

[0070] Based on the above embodiments, the utility model adds a rectifier circuit and an anti-reverse circuit to the front stage of the DCDC, which can share the filter capacitor and the voltage conversion circuit with the fuel cell to achieve the OBC charging function and the fuel cell voltage conversion function, and save the cost of vehicle parts and save the layout space of the vehicle.

[0071] According to the OBC charging circuit proposed in the embodiment of the utility model, one end of the anti-reverse circuit is connected to the positive electrode of the battery stack, and the other end of the anti-reverse circuit is connected to the input end of the voltage conversion circuit; one end of the rectifier circuit is connected to the DC AC input connector, and connected to the vehicle AC charging interface, which can be single-phase or three-phase, and the other end of the rectifier circuit is connected to the DC input DC bus. In this way, the problems of hardware resource waste and vehicle layout space waste caused by the OBC charger and fuel cell being independent module individuals are solved, and the OBC charging function and fuel cell voltage conversion function are realized, and the cost of vehicle parts and the layout space of the vehicle are saved.

[0072] Next, the DCDC converter proposed according to the embodiment of the utility model is described with reference to the accompanying drawings.

[0073] Figure 4 It is a block diagram of a DCDC converter according to an embodiment of the present utility model.

[0074] like Figure 4 As shown, the DCDC converter 20 includes the above-mentioned OBC charging circuit 10 .

[0075] It should be noted that the above explanation of the OBC charging circuit embodiment is also applicable to the DCDC converter of this embodiment, which will not be repeated here.

[0076] Figure 5 The schematic diagram of the structure of the vehicle provided by the embodiment of the utility model is as follows: The vehicle 30 may include the above-mentioned DCDC converter 20 .

[0077] It should be noted that the above explanations and descriptions of the OBC charging circuit embodiment are also applicable to the vehicle of this embodiment and will not be repeated here.

[0078] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0079] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "N" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0080] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code including one or N executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present invention belong.

[0081] It should be understood that the various parts of the utility model can be implemented by hardware, software, firmware or a combination thereof. In the above embodiment, 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 by hardware, as in another embodiment, it can be implemented by any one or a combination of multiple of the following technologies known in the art: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array, a field programmable gate array, etc.

[0082] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0083] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An OBC charging circuit, characterized in that: include: An anti-reverse circuit, one end of which is connected to the positive electrode of the battery stack, and the other end of which is connected to the input end of the voltage conversion circuit; A rectifier circuit, one end of which is connected to the AC charging interface of the vehicle through an AC input plug-in, and the other end of which is connected to the input bus of the direct current DC.

2. The OBC charging circuit according to claim 1, characterized in that: The vehicle AC charging interface is single-phase or three-phase.

3. The OBC charging circuit according to claim 1, characterized in that: When the vehicle AC charging interface is single-phase, the first end of the rectifier circuit is connected to the negative pole of the battery stack, the second and third ends of the rectifier circuit are both connected to the AC input plug-in, and the fourth end of the rectifier circuit is respectively connected to the other end of the anti-reverse circuit and the input end of the voltage conversion circuit.

4. The OBC charging circuit according to claim 3, characterized in that: When the vehicle AC charging interface is single-phase, the rectifier circuit includes: a first diode, wherein a cathode of the first diode is connected to a negative electrode of the battery stack, and an anode of the first diode is connected to the AC input plug-in; a second diode, wherein a cathode of the second diode is connected to a cathode of the first diode and a negative electrode of the battery stack respectively, and an anode of the second diode is connected to the AC input plug-in; a third diode, wherein the cathode of the third diode is connected to the anode of the second diode and the AC input plug-in, respectively, and the anode of the third diode is connected to the other end of the anti-reverse circuit and the input end of the voltage conversion circuit; A fourth diode, wherein the cathode of the fourth diode is respectively connected to the anode of the first diode and the AC input plug-in, and the anode of the fourth diode is respectively connected to the anode of the third diode, the other end of the anti-reverse circuit and the input end of the voltage conversion circuit.

5. The OBC charging circuit according to claim 3, characterized in that: The anti-reverse circuit is a fifth diode or a relay.

6. The OBC charging circuit according to claim 5, characterized in that: An anode of the fifth diode is connected to the positive electrode of the battery stack, and a cathode of the fifth diode is connected to the fourth end of the rectifier circuit.

7. The OBC charging circuit according to claim 5, characterized in that: The relay comprises: a first switch component, a second switch component and a resistor, wherein: The first end of the first switch component is connected to the positive electrode of the battery stack and the first end of the second switch component, and the second end of the first switch component is connected to the second end of the resistor, the input end of the voltage conversion circuit and the fourth end of the rectifier circuit; The first end of the second switch component is connected to the positive electrode of the battery stack and the first end of the first switch component, and the second end of the second switch component is connected to the first end of the resistor; The first end of the resistor is connected to the second end of the second switch component, and the second end of the resistor is connected to the second end of the second switch component, the input end of the voltage conversion circuit and the fourth end of the rectifier circuit.

8. The OBC charging circuit according to claim 1, characterized in that: The anti-reverse circuit and the rectifying circuit are both located in the front stage of the DC-DC converter.

9. A DCDC converter, characterized in that: Comprising the OBC charging circuit as described in any one of claims 1-8.

10. A vehicle, characterized in that: Comprising the DCDC converter as claimed in claim 9.

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