Electric automobile and buck-boost controller thereof

Abstract

The embodiment of the utility model provides an electric automobile and a buck-boost controller thereof, and belongs to the technical field of buck-boost controllers. The buck-boost controller comprises: a switch control module, one end of which is connected with a battery pack and the other end of which is connected with a vehicle quick-plug interface; according to the utility model, by controlling the opening and closing of the first relay and the second relay and cooperating with the switch control module, the charging / discharging control of buck-boost of the battery pack can be realized, and when the switch control module works normally, the comparison circuit module obtains the power supply voltage from the control end of the switch control module; the voltage comparison circuit forms a voltage comparison circuit with the first relay or the second relay and outputs a voltage comparison result which is a result of whether the first relay or the second relay is adhered or not; the adhesion state of the first relay and the second relay can be effectively detected in a voltage comparison mode, adhesion signals can be directly obtained, the judgment logic is simple, and the detection efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of buck-boost controllers, and particularly relates to an electric vehicle and its buck-boost controller. Background Art

[0002] An electric vehicle refers to a vehicle that uses an on-board power source and drives the wheels with an electric motor, meeting the requirements of road traffic and safety regulations. The motor controller is a key electronic device in an electric vehicle, mainly responsible for managing and controlling the electric drive system of the electric vehicle.

[0003] Currently, a motor controller with buck-boost function needs to add a relay to control its connection with the vehicle quick plug, that is, to control the charging and discharging of the battery pack. However, during long-term use, the relay is prone to faults such as adhesion, which in turn affects the safe and stable operation of the motor controller. In the prior art, for the relay adhesion detection method, generally, the voltage across its two ends is directly detected to achieve it. However, in this detection method, there are many detection points and the judgment logic is complex, resulting in low judgment efficiency, and thus affecting the reliability of the motor controller operation.

[0004] In the process of implementing the present utility model, it is found that the above-mentioned solution of the prior art has the defects of high detection complexity and low efficiency. Summary of the Utility Model

[0005] The purpose of the embodiments of the present utility model is to provide an electric vehicle and its buck-boost controller, which have the functions of low detection complexity and high efficiency.

[0006] To achieve the above purpose, the embodiments of the present utility model provide a buck-boost controller for an electric vehicle, including:

[0007] A switch control module, one end is connected to the battery pack, and the other end is connected to the vehicle quick plug interface;

[0008] A first relay, arranged between the switch control module and the vehicle quick plug interface, one end is connected to the positive pole of the other end of the switch control module, and the other end is connected to the positive pole of the vehicle quick plug interface;

[0009] A second relay, arranged between the switch control module and the vehicle quick plug interface, one end is connected to the negative pole of the other end of the switch control module, and the other end is connected to the negative pole of the vehicle quick plug interface;

[0010] Two groups of comparison circuit modules, one end of the comparison circuit module is connected to the control end of the switch control module, and the other end of the comparison circuit module is connected to the other end of the first relay or the second relay, for voltage comparison detection of the adhesion state of the first relay or the second relay.

[0011] Optionally, the comparison circuit module includes:

[0012] A comparator, the positive power supply terminal of the comparator is connected to the control terminal of the switch control module, and the negative power supply terminal of the comparator is grounded;

[0013] A first voltage dividing module, the first end is connected to the control terminal of the switch control module, the second end is connected to the negative input terminal of the comparator, and the third end is grounded;

[0014] A second voltage dividing module, the first end is connected to the control terminal of the switch control module, the second end is connected to the positive input terminal of the comparator, and the third end is connected to the other end of the first relay or the second relay;

[0015] A fifth resistor, one end is connected to the control terminal of the switch control module, and the other end is connected to the output terminal of the comparator.

[0016] Optionally, the first voltage dividing module includes:

[0017] A first resistor, one end is connected to the control terminal of the switch control module, and the other end is connected to the negative input terminal of the comparator;

[0018] A second resistor, one end is connected to the other end of the first resistor, and the other end is grounded;

[0019] A first capacitor, one end is connected to one end of the second resistor, and the other end is connected to the other end of the second resistor.

[0020] Optionally, the second voltage dividing module includes:

[0021] A third resistor, one end is connected to the control terminal of the switch control module, and the other end is connected to the positive input terminal of the comparator;

[0022] A fourth resistor, one end is connected to the other end of the third resistor.

[0023] Optionally, the second voltage dividing module further includes an anti-reverse diode, the positive electrode of the anti-reverse diode is connected to the other end of the fourth resistor, and the negative electrode of the anti-reverse diode is connected to the other end of the first relay or the second relay.

[0024] Optionally, the switch control module includes:

[0025] A battery pack;

[0026] A first controllable switch, one end is connected to the positive electrode of the battery pack;

[0027] A second controllable switch, one end of which is connected to the other end of the first controllable switch, and the other end of which is connected to the negative electrode of the battery pack;

[0028] A third controllable switch, one end of which is connected to one end of the first controllable switch;

[0029] A fourth controllable switch, one end of which is connected to the other end of the third controllable switch, and the other end of which is connected to the other end of the second controllable switch;

[0030] A fifth controllable switch, one end of which is connected to one end of the third controllable switch;

[0031] A sixth controllable switch, one end of which is connected to the other end of the fifth controllable switch, and the other end of which is connected to the other end of the fourth controllable switch;

[0032] A second capacitor, one end of which is connected to the positive electrode of the battery pack, and the other end of which is connected to the negative electrode of the battery pack;

[0033] A first inductor, one end of which is connected to the other end of the first controllable switch, and the other end of which is connected to one end of the first relay;

[0034] A second inductor, one end of which is connected to the other end of the third controllable switch, and the other end of which is connected to the other end of the first inductor;

[0035] A third inductor, one end of which is connected to the other end of the fifth controllable switch, and the other end of which is connected to the other end of the second inductor;

[0036] A third capacitor, one end of which is connected to the other end of the first relay, and the other end of which is connected to the other end of the second relay.

[0037] Optionally, the first controllable switch, the second controllable switch, the third controllable switch, the fourth controllable switch, the fifth controllable switch or the sixth controllable switch includes an IGBT.

[0038] Optionally, the control end of the switch control module includes the driving ends of the first controllable switch, the second controllable switch, the third controllable switch, the fourth controllable switch, the fifth controllable switch or the sixth controllable switch.

[0039] On the other hand, the present utility model further provides an electric vehicle, including:

[0040] An electric vehicle body;

[0041] A buck-boost controller as described in any one of the above.

[0042] Through the above technical solutions, the electric vehicle and its buck-boost controller provided by the present utility model can achieve charge / discharge control of buck-boost for the battery pack by controlling the opening and closing of the first relay and the second relay, and cooperating with the switch control module. When the switch control module is working properly, the comparison circuit module obtains the power supply voltage from the control terminal of the switch control module, forms a voltage comparison circuit with the first relay or the second relay, and outputs the result of the voltage comparison, that is, the result of whether the first relay or the second relay is stuck. The method of voltage comparison can effectively detect the stuck state of the first relay and the second relay, and can directly obtain the stuck signal, with simple judgment logic and high detection efficiency, thereby ensuring the reliability of the operation of the buck-boost controller.

[0043] Other features and advantages of the embodiments of the present utility model will be described in detail in the subsequent specific implementation part. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The drawings are used to provide a further understanding of the embodiments of the present utility model, and constitute a part of the specification, and are used together with the following specific implementation to explain the embodiments of the present utility model, but do not constitute a limitation to the embodiments of the present utility model. In the drawings:

[0045] Figure 1 is a circuit block diagram of a buck-boost controller of an electric vehicle according to an embodiment of the present utility model;

[0046] Figure 2 is a circuit diagram of a comparison circuit module in a buck-boost controller of an electric vehicle according to an embodiment of the present utility model;

[0047] Figure 3 is a structural schematic diagram of a voltage division module in a buck-boost controller of an electric vehicle according to an embodiment of the present utility model;

[0048] Figure 4 is a circuit diagram of a control switch module in a buck-boost controller of an electric vehicle according to an embodiment of the present utility model.

[0049] DESCRIPTION OF THE REFERENCE NUMERALS

[0050] 01, switch control module 02, comparison circuit module

[0051] 03, vehicle quick plug interface 04, first voltage division module

[0052] 05, second voltage division module T, comparator

[0053] BT, battery pack K1, first relay

[0054] K2, second relay R1, first resistor

[0055] R2, the second resistor R3, and the third resistor

[0056] R4, the fourth resistor R5, and the fifth resistor

[0057] C1, the first capacitor C2, and the second capacitor

[0058] C3, the third capacitor D1, and the anti - reverse diode

[0059] L1, the first inductor L2, and the second inductor

[0060] L3, the third inductor Ka, and the first controllable switch

[0061] Kb, the second controllable switch Kc, and the third controllable switch

[0062] Kd, the fourth controllable switch Ke, and the fifth controllable switch

[0063] Kf, the sixth controllable switch Detailed implementation manners

[0064] The following will describe in detail the specific implementation manners of the embodiments of the present utility model with reference to the accompanying drawings. It should be understood that the specific implementation manners described herein are only used to illustrate and explain the embodiments of the present utility model, and are not used to limit the embodiments of the present utility model.

[0065] Figure 1 is a circuit block diagram of a buck - boost controller of an electric vehicle according to an embodiment of the present utility model; Figure 2 is a circuit diagram of a comparison circuit module in a buck - boost controller of an electric vehicle according to an embodiment of the present utility model. In Figure 1 and Figure 2 the buck - boost controller may include a switch control module 01, a first relay K1, a second relay K2, and two groups of comparison circuit modules 02.

[0066] One end of the switch control module 01 is connected to the battery pack BT, and the other end of the switch control module 01 is connected to the vehicle quick plug interface 03. The first relay K1 is arranged between the switch control module 01 and the vehicle quick plug interface 03. One end of the first relay K1 is connected to the positive pole of the other end of the switch control module 01, and the other end of the first relay K1 is connected to the positive pole of the vehicle quick plug interface 03. The second relay K2 is arranged between the switch control module 01 and the vehicle quick plug interface 03. One end of the second relay K2 is connected to the negative pole of the other end of the switch control module 01, and the other end of the second relay K2 is connected to the negative pole of the vehicle quick plug interface 03. One end of the comparison circuit module 02 is connected to the control end of the switch control module 01, and the other end of the comparison circuit module 02 is connected to the other end of the first relay or the second relay, and is used for detecting the adhesion state of the first relay or the second relay by voltage comparison.

[0067] Since the first relay K1 and the second relay K2 are arranged between the switch control module 01 and the vehicle quick plug interface 03 and control the conduction and cut-off of the battery pack BT and the vehicle quick plug interface 03, the charging / discharging of the battery pack BT can be realized when the first relay K1 and the second relay K2 are closed. When it is necessary to detect the adhesion state of the first relay K1 or the second relay K2, the comparison circuit module 02 obtains the power supply voltage from the control end of the switch control module 01, forms a voltage comparison circuit with the first relay K1 or the second relay K2, and finally outputs the result of the voltage comparison, that is, the adhesion result / signal of the first relay K1 or the second relay K2. According to this adhesion signal, the adhesion state of the first relay K1 or the second relay K2 can be determined.

[0068] In the traditional relay adhesion detection method, generally, the voltage across its two ends is directly detected, and the adhesion result of the relay can be obtained only through a complex logic circuit. There are many detection points and many wire harnesses. In this embodiment of the present invention, by adopting the method that two groups of comparison circuit modules 02 are respectively connected to the other ends of the first relay K1 and the second relay K2, a voltage comparison circuit can be formed with the first relay K1 and the second relay K2, and the adhesion signal of the first relay K1 or the second relay K2 can be directly output. On the one hand, the detection points are saved, and on the other hand, complex logic judgment is not required, effectively improving the detection efficiency and accuracy, and further ensuring the reliability of the operation of the buck-boost controller.

[0069] In this embodiment of the present invention, as Figure 2 shown, the comparison circuit module 02 may include a comparator T, a first voltage dividing module 04, a second voltage dividing module 05, and a fifth resistor R5.

[0070] The positive power supply terminal of comparator T is connected to the control terminal of switch control module 01, and the negative power supply terminal of comparator T is grounded. The first end of the first voltage dividing module 04 is connected to the control terminal of switch control module 01, the second end of the first voltage dividing module 04 is connected to the negative input terminal of comparator T, and the third end of the first voltage dividing module 04 is grounded. The first end of the second voltage dividing module 05 is connected to the control terminal of switch control module 01, the second end of the second voltage dividing module 05 is connected to the positive input terminal of comparator T, and the third end of the second voltage dividing module 05 is connected to the other end of the first relay or the second relay. One end of the fifth resistor R5 is connected to the control terminal of switch control module 01, and the other end of the fifth resistor R5 is connected to the output terminal of comparator T. Specifically, this fifth resistor R5 is the pull-up resistor of comparator T.

[0071] The control terminal of switch control module 01 is generally the driving voltage of the switching device, and this driving voltage is used as the starting voltage of comparator T. The first voltage dividing module 04 divides the driving voltage and inputs it to the negative input terminal of comparator T, while whether the second voltage dividing module 05 divides the voltage needs to consider whether the first relay K1 or the second relay K2 is stuck. Specifically, if the first relay K1 or the second relay K2 is stuck, the first relay K1 or the second relay K2 can conduct the voltage dividing circuit of the second voltage dividing module 05, and at this time, the voltage input to the positive input terminal of comparator T is the divided voltage; if the first relay K1 or the second relay K2 is not stuck, the first relay K1 or the second relay K2 cannot conduct the voltage dividing circuit of the second voltage dividing module 05, and at this time, the voltage input to the positive input terminal of comparator T is the driving voltage. Therefore, if the input of comparator T is high level, it indicates that the first relay K1 or the second relay K2 is not stuck, otherwise it indicates that the first relay K1 or the second relay K2 is stuck. By using the method of voltage comparison with comparator T, it can effectively determine whether the first relay K1 or the second relay K2 conducts the voltage dividing circuit of the second voltage dividing module 05, and then determine the stuck state of the first relay K1 or the second relay K2, with faster detection efficiency and higher detection accuracy.

[0072] In this embodiment of the present invention, as Figure 3 shown, the first voltage dividing module 04 may include a first resistor R1, a second resistor R2, and a first capacitor C1; the second voltage dividing module 05 may include a third resistor R3 and a fourth resistor R4.

[0073] One end of the first resistor R1 is connected to the control terminal of the switch control module 01, and the other end of the first resistor R1 is connected to the negative input terminal of the comparator T. One end of the second resistor R2 is connected to the other end of the first resistor R1, and the other end of the second resistor R2 is grounded. One end of the first capacitor C1 is connected to one end of the second resistor R2, and the other end of the first capacitor C1 is connected to the other end of the second resistor R2. One end of the third resistor R3 is connected to the control terminal of the switch control module 01, and the other end of the third resistor R3 is connected to the positive input terminal of the comparator T. One end of the fourth resistor R4 is connected to the other end of the third resistor R3, and the other end of the fourth resistor R4 is used to be connected to the other end of the first relay K1 or the second relay K2 to form a voltage dividing circuit.

[0074] When detecting the adhesion of the first relay K1 or the second relay K2, taking the driving voltage of 15V of the IGBT as an example, after the driving voltage is divided by the first resistor R1 and the second resistor R2, the input voltage V1 of the negative input terminal of the comparator T can be obtained. Specifically, the input voltage V1 of the negative input terminal of the comparator T = 15 * R2 / (R1 + R2). When the driving voltage passes through the third resistor R3, there are two cases:

[0075] One is when the first relay K1 or the second relay K2 is adhered, the driving voltage passes through the third resistor R3, the fourth resistor R4, the first relay K1 or the second relay K2, and the negative copper bar of the switch control module 01, that is, the fourth resistor R4 and the third resistor R3 cooperate to form a voltage dividing circuit. Specifically, the input voltage V2 of the positive input terminal of the comparator T = 15 * R4 / (R3 + R4). By setting the resistance values of the third resistor R3 and the fourth resistor R4, so that the input voltage V2 of the positive input terminal of the comparator T is less than or equal to the input voltage V1 of the negative input terminal of the comparator T, the comparator T outputs a low level. Specifically, this low level is also the adhesion signal of the relay. In addition, in order to improve the accuracy of the output level of the comparator T, the resistance values of the first resistor R1 and the second resistor R2 can be set to increase the voltage difference between the positive input terminal and the negative input terminal of the comparator T.

[0076] The other is when the first relay K1 or the second relay K2 is not adhered, the driving voltage is directly input to the positive input terminal of the comparator T through the third resistor R3, and no voltage dividing circuit is formed with the first relay K1 or the second relay K2. At this time, the input voltage V2 of the positive input terminal of the comparator T = 15V. And the input voltage of the negative input terminal of the comparator T is stably V1 = 15 * R2 / (R1 + R2), so the comparator T outputs a high level. Specifically, this high level is also the non - adhesion signal of the relay.

[0077] By adopting the above-mentioned method of the comparison circuit module 02, the structure of the adhesion judgment circuit is effectively optimized, the PCB area is reduced, no extra wiring harness is needed, and the cost is saved.

[0078] In this embodiment of the present invention, as Figure 3 shown, the second voltage dividing module 05 may further include an anti-reverse diode D1. Specifically, the anti-reverse diode D1 is disposed between the fourth resistor R4, the first relay K1 or the second relay K2. Specifically, the positive electrode of the anti-reverse diode D1 is connected to the other end of the fourth resistor R4, and the negative electrode of the anti-reverse diode D1 is connected to the other end of the first relay K1 or the second relay K2. Specifically, the anti-reverse diode D1 can prevent the current from flowing backward to protect the comparison circuit module 02. Specifically, when calculating the input voltage V2 at the positive-phase input terminal of the comparator T, for the sake of convenience of description, the conduction voltage drop of the anti-reverse diode D1 is not considered, but it needs to be considered in actual calculation.

[0079] In this embodiment of the present invention, as Figure 4 shown, the switch control module 01 may include a battery pack BT, a first controllable switch Ka, a second controllable switch Kb, a third controllable switch Kc, a fourth controllable switch Kd, a fifth controllable switch Ke, a sixth controllable switch Kf, a second capacitor C2, a first inductor L1, a second inductor L2, a third inductor L3, and a third capacitor C3.

[0080] One end of the first controllable switch Ka is connected to the positive electrode of the battery pack BT, one end of the second controllable switch Kb is connected to the other end of the first controllable switch Ka, and the other end of the second controllable switch Kb is connected to the negative electrode of the battery pack BT. One end of the third controllable switch Kc is connected to the one end of the first controllable switch Ka, one end of the fourth controllable switch Kd is connected to the other end of the third controllable switch Kc, and the other end of the fourth controllable switch Kd is connected to the other end of the second controllable switch Kb. One end of the fifth controllable switch Ke is connected to the one end of the third controllable switch Kc, one end of the sixth controllable switch Kf is connected to the other end of the fifth controllable switch Ke, and the other end of the sixth controllable switch Kf is connected to the other end of the fourth controllable switch Kd. One end of the second capacitor C2 is connected to the positive electrode of the battery pack BT, and the other end of the second capacitor C2 is connected to the negative electrode of the battery pack BT. One end of the first inductor L1 is connected to the other end of the first controllable switch Ka, and the other end of the first inductor L1 is connected to one end of the first relay K1. One end of the second inductor L2 is connected to the other end of the third controllable switch Kc, and the other end of the second inductor L2 is connected to the other end of the first inductor L1. One end of the third inductor L3 is connected to the other end of the fifth controllable switch Ke, and the other end of the third inductor L3 is connected to the other end of the second inductor. One end of the third capacitor C3 is connected to the other end of the first relay K1, and the other end of the third capacitor C3 is connected to the other end of the second relay K2.

[0081] Multiple controllable switches cooperate to form a three-phase full-bridge circuit. Cooperating with the second capacitor C2, the third capacitor C3, the first inductor L1, the second inductor L2, and the third inductor L3, corresponding rectification and inversion circuits can be formed, and at the same time, a buck-boost circuit can also be constituted. Specifically, one end of the switch control module 01 is connected to the battery pack BT, and the other end is connected to the vehicle quick plug interface 03. Therefore, the battery pack BT can step down and discharge the devices externally connected to the vehicle quick plug interface 03 through the switch control module 01. The vehicle quick plug interface 03 can also be externally connected to a power source and step up and charge the battery pack BT through the switch control module 01. During the charging and discharging process of the battery pack BT, the switch control module 01 can also rectify and invert the voltage synchronously. In addition, the controllable switches in this three-phase full-bridge circuit generally come with freewheeling diodes, so they are not shown additionally in the figure.

[0082] Specifically, when the first relay K1 is stuck, the drive voltage forms a voltage division loop through the third resistor R3, the fourth resistor R4, the first relay K1, and the inductor. When the second relay K2 is stuck, the drive voltage forms a voltage division loop through the third resistor R3, the fourth resistor R4, the second relay K2, and the negative copper busbar.

[0083] In this embodiment of the present invention, the specific forms of the first controllable switch Ka, the second controllable switch Kb, the third controllable switch Kc, the fourth controllable switch Kd, the fifth controllable switch Ke, or the sixth controllable switch Kf include, but are not limited to, IGBTs.

[0084] In this embodiment of the present invention, the control end of the switch control module 01 may include the drive ends of the first controllable switch Ka, the second controllable switch Kb, the third controllable switch Kc, the fourth controllable switch Kd, the fifth controllable switch Ke, or the sixth controllable switch Kf. Specifically, that is, the drive end of one of the IGBTs serves as the supply voltage of the comparator T.

[0085] On the other hand, the present invention also provides an electric vehicle. Specifically, the electric vehicle may include an electric vehicle body and a buck-boost controller. Specifically, the buck-boost controller may include a switch control module 01, a first relay K1, a second relay K2, and two groups of comparison circuit modules 02.

[0086] One end of the switch control module 01 is connected to the battery pack BT, and the other end of the switch control module 01 is connected to the vehicle quick plug interface 03. The first relay K1 is arranged between the switch control module 01 and the vehicle quick plug interface 03. One end of the first relay K1 is connected to the positive pole of the other end of the switch control module 01, and the other end of the first relay K1 is connected to the positive pole of the vehicle quick plug interface 03. The second relay K2 is arranged between the switch control module 01 and the vehicle quick plug interface 03. One end of the second relay K2 is connected to the negative pole of the other end of the switch control module 01, and the other end of the second relay K2 is connected to the negative pole of the vehicle quick plug interface 03. One end of the comparison circuit module 02 is connected to the control end of the switch control module 01, and the other end of the comparison circuit module 02 is connected to the other end of the first relay or the second relay, and is used for detecting the adhesion state of the first relay or the second relay by voltage comparison.

[0087] Since the first relay K1 and the second relay K2 are arranged between the switch control module 01 and the vehicle quick plug interface 03 and control the conduction and cut-off of the battery pack BT and the vehicle quick plug interface 03, the charging / discharging of the battery pack BT can be realized when the first relay K1 and the second relay K2 are closed. When it is necessary to detect the adhesion state of the first relay K1 or the second relay K2, the comparison circuit module 02 obtains the power supply voltage from the control end of the switch control module 01, forms a voltage comparison circuit with the first relay K1 or the second relay K2, and finally outputs the result of the voltage comparison, that is, the adhesion result / signal of the first relay K1 or the second relay K2. According to this adhesion signal, the adhesion state of the first relay K1 or the second relay K2 can be determined.

[0088] Through the above technical solution, the electric vehicle and its buck-boost controller provided by the utility model can realize the buck-boost charging / discharging control of the battery pack by controlling the opening and closing of the first relay and the second relay, and cooperating with the switch control module 01. When the switch control module 01 works normally, the comparison circuit module 02 obtains the power supply voltage from the control end of the switch control module 01, forms a voltage comparison circuit with the first relay or the second relay, and outputs the result of the voltage comparison, that is, the result of whether the first relay or the second relay is adhered; the voltage comparison method can effectively detect the adhesion state of the first relay and the second relay, and can directly obtain the adhesion signal, the judgment logic is simple, the detection efficiency is high, and the reliability of the operation of the buck-boost controller is guaranteed.

[0089] It should also be noted that the term "comprise", "include" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, commodity or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, commodity or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, commodity or device comprising the element.

[0090] The above are only embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A buck-boost controller for an electric vehicle, characterized in that: include: A switch control module, one end of which is connected to the battery pack and the other end is connected to the vehicle quick-plug interface; A first relay, arranged between the switch control module and the vehicle quick-plug interface, one end of which is connected to the positive electrode of the other end of the switch control module, and the other end of which is connected to the positive electrode of the vehicle quick-plug interface; A second relay is arranged between the switch control module and the vehicle quick plug interface, one end of which is connected to the negative electrode of the other end of the switch control module, and the other end of which is connected to the negative electrode of the vehicle quick plug interface; Two groups of comparison circuit modules, one end of the comparison circuit module is connected to the control end of the switch control module, and the other end of the comparison circuit module is connected to the other end of the first relay or the second relay, for performing voltage comparison detection on the adhesion state of the first relay or the second relay.

2. The buck-boost controller according to claim 1, characterized in that: The comparison circuit module comprises: A comparator, wherein the positive power terminal of the comparator is connected to the control terminal of the switch control module, and the negative power terminal of the comparator is grounded; A first voltage dividing module, a first end of which is connected to the control end of the switch control module, a second end of which is connected to the negative phase input end of the comparator, and a third end of which is grounded; A second voltage divider module, a first end of which is connected to the control end of the switch control module, a second end of which is connected to the non-phase input end of the comparator, and a third end of which is connected to the other end of the first relay or the second relay; A fifth resistor has one end connected to the control end of the switch control module and the other end connected to the output end of the comparator.

3. The buck-boost controller according to claim 2, characterized in that: The first voltage dividing module comprises: A first resistor, one end of which is connected to the control end of the switch control module, and the other end of which is connected to the negative phase input end of the comparator; a second resistor, one end of which is connected to the other end of the first resistor and the other end of which is grounded; A first capacitor has one end connected to one end of the second resistor and the other end connected to the other end of the second resistor.

4. The buck-boost controller according to claim 2, characterized in that: The second voltage dividing module comprises: A third resistor, one end of which is connected to the control end of the switch control module, and the other end of which is connected to the non-inverting input end of the comparator; A fourth resistor has one end connected to the other end of the third resistor.

5. The buck-boost controller according to claim 4, characterized in that: The second voltage divider module further includes an anti-reverse diode, the anode of the anti-reverse diode is connected to the other end of the fourth resistor, and the cathode of the anti-reverse diode is connected to the other end of the first relay or the second relay.

6. The buck-boost controller according to claim 1, characterized in that: The switch control module comprises: Battery pack; A first controllable switch, one end of which is connected to the positive electrode of the battery pack; a second controllable switch, one end of which is connected to the other end of the first controllable switch, and the other end of which is connected to the negative electrode of the battery pack; a third controllable switch, one end of which is connected to one end of the first controllable switch; a fourth controllable switch, one end of which is connected to the other end of the third controllable switch, and the other end of which is connected to the other end of the second controllable switch; a fifth controllable switch, one end of which is connected to one end of the third controllable switch; a sixth controllable switch, one end of which is connected to the other end of the fifth controllable switch, and the other end of which is connected to the other end of the fourth controllable switch; A second capacitor, one end of which is connected to the positive electrode of the battery pack, and the other end of which is connected to the negative electrode of the battery pack; a first inductor, one end of which is connected to the other end of the first controllable switch, and the other end of which is connected to one end of the first relay; a second inductor, one end of which is connected to the other end of the third controllable switch, and the other end of which is connected to the other end of the first inductor; a third inductor, one end of which is connected to the other end of the fifth controllable switch, and the other end of which is connected to the other end of the second inductor; A third capacitor has one end connected to the other end of the first relay, and another end connected to the other end of the second relay.

7. The buck-boost controller according to claim 6, characterized in that: The first controllable switch, the second controllable switch, the third controllable switch, the fourth controllable switch, the fifth controllable switch or the sixth controllable switch includes an IGBT.

8. The buck-boost controller according to claim 6, characterized in that: The control end of the switch control module includes a driving end of the first controllable switch, the second controllable switch, the third controllable switch, the fourth controllable switch, the fifth controllable switch or the sixth controllable switch.

9. An electric vehicle, characterized in that: include: Electric vehicle body; A buck-boost controller as claimed in any one of claims 1 to 8.

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