Interlocking detection circuit and vehicle

Abstract

The utility model relates to the technical field of interlocking detection, and discloses an interlocking detection circuit and a vehicle, comprising an interlocking connector, a first coupling module, a second coupling module and a signal processing module. The interlocking connector comprises a first connecting plug and a second connecting plug electrically connected with the first connecting plug, the first connecting plug is connected with the first coupling module, and the second connecting plug is connected with the second coupling module. The signal processing module is respectively connected with the first coupling module and the second coupling module, and the signal processing module outputs a first carrier signal to the first coupling module so as to transmit the first carrier signal to the interlocking connector and receive a second carrier signal output by the second coupling module. And determining the interlocking state of the interlocking connector according to the first carrier signal and the second carrier signal. The interlocking state of the interlocking connector can be judged when the first connecting plug and the second connecting plug are not connected or are in poor contact and the like due to the fact that the high-voltage terminal is lost, broken or bent, and the accuracy of interlocking detection is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of interlock detection, and particularly to an interlock detection circuit and a vehicle. BACKGROUND

[0002] High-voltage interlock detection is a commonly used technical means in an electric vehicle system, which indirectly detects the reliability of high-voltage connection through low-voltage detection. The safety of the electric equipment and personnel is ensured before the whole vehicle system is powered on at high voltage, and the safety hidden danger caused by disconnection or instability of high-voltage connection is reduced. In the related art, two low-voltage terminals are added to the interlock connector to determine whether the entire interlock connector is connected effectively by detecting whether the low-voltage terminals are connected. The common method is to design the positive and negative high-voltage terminals to be longer and the positive and negative low-voltage terminals to be shorter, so that when the low-voltage terminals are contacted, it is determined that the high-voltage terminals are certainly contacted. This method cannot directly guarantee the connection reliability of the high-voltage terminals. For the cases of missing, breaking, or bending of the high-voltage terminals, the system will misidentify the connection as normal, which will cause great safety hazards. Therefore, how to improve the accuracy of interlock detection has become a technical problem to be solved. CONTENT OF THE INVENTION

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides an interlock detection circuit and a vehicle, which solves the problem of low accuracy of interlock detection.

[0004] In a first aspect, the present application provides an interlock detection circuit, comprising an interlock connector, the interlock connector comprising a first plug and a second plug electrically connected to the first plug, the interlock detection circuit further comprising a first coupling module, a second coupling module, and a signal processing module;

[0005] The first plug is signal connected to the first coupling module, and the second plug is signal connected to the second coupling module.

[0006] The signal processing module is signal connected to the first coupling module and the second coupling module, respectively, and the signal processing module is configured to output a first carrier signal to the first coupling module, so as to transmit the first carrier signal to the interlock connector, and receive a second carrier signal output by the second coupling module.

[0007] The signal processing module is further configured to determine an interlock state of the interlock connector according to the first carrier signal and the second carrier signal.

[0008] In some embodiments, the signal processing module comprises a controller and a transceiver unit signal connected to the controller.

[0009] The controller is configured to output a first interlock message to the transceiver unit, and upon receiving a second interlock message sent by the transceiver unit, determine the interlock state of the interlock connector by comparing the first interlock message with the second interlock message;

[0010] The transceiver unit is configured to output the first carrier signal to the first coupling module according to the first interlock message when receiving the first interlock message, and to send the second interlock message to the controller according to the second carrier signal when receiving the second carrier signal from the second coupling module.

[0011] In some embodiments, the interlock detection circuit includes a plurality of interlock connectors; and further includes:

[0012] a first switch for controlling the disconnection or connection between the transceiver unit and the first coupling module according to an instruction of the controller, the first switch being provided on a one-to-one basis with the interlock connector; and / or a second switch for controlling the disconnection or connection between the transceiver unit and the second coupling module according to an instruction of the controller, the second switch being provided on a one-to-one basis with the interlock connector.

[0013] In some embodiments, the interlock detection circuit includes multiple interlock connectors; and also includes a second switch for controlling the disconnection or connection between the transceiver unit and the second coupling module according to the instructions of the controller, and the second switch is set one-to-one with the interlock connector; each second switch is a radio frequency switch, and the controller can control the multiple second switches to disconnect or connect in a timed sequence.

[0014] In some embodiments, the interlock detection circuit further includes at least two first switches for controlling the disconnection or connection between the transceiver unit and the first coupling module according to instructions of the controller.

[0015] In some embodiments, the interlock detection circuit includes a first coupling module that is set one-to-one with the first plug connector, and a second coupling module that is set one-to-one with the second plug connector; the first coupling module is connected to the first plug connector, and the second coupling module is connected to the second plug connector.

[0016] In some embodiments, the first coupling module includes a first capacitor, a second capacitor, and a first transformer;

[0017] The first end of the first capacitor is connected with the signal processing module, the second end of the first capacitor is connected with the first end of the first transformer, the second end of the first transformer is grounded, the third end of the first transformer is connected with the first end of the second capacitor, the second end of the second capacitor is connected with the first positive electrode, and the fourth end of the first transformer is connected with the first negative electrode.

[0018] In some embodiments, the second plug connector comprises a second positive electrode and a second negative electrode, and the second coupling module comprises a third capacitor, a fourth capacitor and a second transformer.

[0019] The first end of the third capacitor is connected with the signal processing module, the second end of the third capacitor is connected with the first end of the second transformer, the second end of the second transformer is grounded, the third end of the second transformer is connected with the first end of the fourth capacitor, the second end of the fourth capacitor is connected with the second positive electrode, and the fourth end of the second transformer is connected with the second negative electrode.

[0020] In some embodiments, the interlock detection circuit comprises a first isolator and a second isolator, the first coupling module is in the first isolator, and the second coupling module is in the second isolator.

[0021] In a second aspect, the embodiments of the present application provide a vehicle comprising the interlock detection circuit according to the first aspect.

[0022] The interlock detection circuit provided by the embodiments of the present application comprises an interlock connector, a first coupling module, a second coupling module and a signal processing module. The interlock connector comprises a first plug connector and a second plug connector electrically connected with the first plug connector, the first plug connector is connected with the first coupling module, and the second plug connector is connected with the second coupling module. The signal processing module is connected with the first coupling module and the second coupling module respectively, the signal processing module outputs a first carrier signal to the first coupling module to transmit the first carrier signal to the interlock connector, and receives a second carrier signal output by the second coupling module. The interlock state of the interlock connector is determined according to the first carrier signal and the second carrier signal. In the case that the high-voltage terminal is missing, broken or bent to cause the first plug connector and the second plug connector not to be connected or to have poor contact, the interlock state of the interlock connector can be determined, and the accuracy of interlock detection is improved.

[0023] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0024] The present application will be further described below in conjunction with the drawings and embodiments, in which:

[0025] Figure 1 It is a schematic diagram of the second interlock detection in the related art;

[0026] Figure 2 1 is a schematic diagram of an interlock detection circuit provided in a first embodiment of the present application;

[0027] Figure 3 is a schematic diagram of an interlocking connector provided in an embodiment of the present application;

[0028] Figure 4 is a schematic diagram of an interlock detection circuit provided in a second embodiment of the present application;

[0029] Figure 5 is a schematic diagram of an interlock detection circuit provided in a third embodiment of the present application;

[0030] Figure 6 is a schematic diagram of an interlock detection circuit provided in a fourth embodiment of the present application;

[0031] Figure 7 This is a schematic diagram of an interlock detection circuit provided in the fifth embodiment of the present application. DETAILED DESCRIPTION

[0032] The following describes embodiments of the present invention in detail. 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 only to explain the present invention and are not to be construed as limiting the present invention.

[0033] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0034] In the description of this utility model, "several" means more than one, "plurality" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of the terms "first" and "second" is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0035] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0036] In the description of the present invention, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" 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 present invention. In this specification, the exemplary expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0037] First, let’s analyze some of the terms used in this application:

[0038] Interlock connectors: These are high-voltage interlock connectors, functional components that connect and disconnect circuits using electrical signals or mechanical force. They consist of a fixed-end electrical connector (also called a receptacle) and a free-end electrical connector (also called a plug). In the following description, when the fixed-end electrical connector is the first plug connector, the free-end electrical connector is the second plug connector. When the fixed-end electrical connector is the second plug connector, the free-end electrical connector is the first plug connector.

[0039] Electric Air-Conditioner (EAC): Compared to fuel vehicles where the air-conditioning compressor is powered by the engine pulley, new energy vehicle air-conditioning uses an electric air-conditioning compressor, which is powered by the battery.

[0040] High-voltage power distribution unit (PDU): responsible for the power distribution and management of the high-voltage system of electric vehicles, providing charging and discharging control, high-voltage component power-on control, circuit overload and short-circuit protection, high-voltage sampling, low-voltage control and other functions for the entire vehicle, protecting and monitoring the operation of the high-voltage system.

[0041] Positive Temperature Coefficient (PTC): PTC generally refers to materials or components with a large positive temperature coefficient. PTC is generally used as a heat source for air conditioning in electric vehicles, so it is often called electric heating.

[0042] Battery Management System (BMS): Intelligently manages and maintains each battery cell, monitors the battery status, and prevents overcharging and over-discharging to extend the battery life.

[0043] Pure electric vehicles and plug-in hybrid electric vehicles typically operate at voltages exceeding 300V and currents exceeding several hundred amperes. The high-voltage circuit is a critical component of the vehicle's high-voltage electrical system. Its reliability and safety are crucial to the overall system reliability and even personal safety, guaranteeing the safe operation of new energy vehicles. Interlocking connectors, as a vital component of the vehicle's functional modules and high-voltage circuits, require interlock testing technology to verify their reliability.

[0044] In the related art, by adding two low-voltage terminals to the interlocking connector and detecting whether the low-voltage terminal connection is intact, it is determined whether the entire interlocking connector is connected effectively. There are two commonly used methods. The first method is to design the positive high-voltage terminal and the negative high-voltage terminal to be longer, and the low-voltage terminal to be shorter. When the socket and plug in the interlocking connector are connected to each other, the low-voltage terminal interlocking connection is detected, and it is determined that the positive high-voltage terminal and the negative high-voltage terminal are also connected. This method cannot directly guarantee the reliable connection of the high-voltage terminal. If the high-voltage terminal is missing, broken, or bent, the system will mistakenly identify it as a normal connection, which will create a huge safety hazard.

[0045] The second method is Figure 1 As shown, the interlock connector 20 on the EAC side, the interlock connector 21 on the PDU side and the interlock connector 22 on the PTC side are connected in series with low voltage interlocking through the low voltage wiring harness, and the BMS emits R X signal to multiple interlock connectors and receives a return T X signal, by turning R X Signal and T X This method can detect whether the interlock connector is properly connected at a low cost, but it cannot locate the faulty interlock connector. In addition, if the high-voltage terminal is missing, broken, or bent, the system will mistakenly identify it as a normal connection.

[0046] Based on this, an interlock detection circuit is provided in an embodiment of the present application, which is specifically described through the following embodiments.

[0047] See also Figure 2 and Figure 3 The interlock detection circuit includes an interlock connector 31, a first coupling module 32, a second coupling module 33 and a signal processing module 34. The interlock connector 31 includes a first plug connector 310 and a second plug connector 311 electrically connected to the first plug connector 310.

[0048] The first plug connector 310 is signal-connected to the first coupling module 32, and the second plug connector 311 is signal-connected to the second coupling module 33. The signal processing module 34 is signal-connected to the first coupling module 32 and the second coupling module 33, respectively. The signal processing module 34 is configured to output a first carrier signal to the first coupling module 32 for transmission to the interlocking connector, and to receive a second carrier signal output by the second coupling module 33. The signal processing module 34 is further configured to determine the interlocking state of the interlocking connector 31 based on the first and second carrier signals.

[0049] The interlocking state includes normal interlocking and abnormal interlocking. When the first plug connector 310 and the second plug connector 311 are normally connected, the interlocking is normal. When the first plug connector 310 and the second plug connector 311 are poorly connected or not connected, the interlocking is abnormal.

[0050] After the signal processing module 34 outputs the first carrier signal to the first coupling module 32, the first coupling module 32 couples the first carrier signal to the first plug connector 310. When the first plug connector 310 and the second plug connector 311 are properly connected, the first carrier signal can be transmitted from the first plug connector 310 to the second plug connector 311 and coupled to the second coupling module 33. At this point, the signal processing module 34 receives the second carrier signal output by the second coupling module 33 and analyzes the first carrier signal and the second carrier signal. If they match, it indicates that the first plug connector 310 and the second plug connector 311 are properly connected and the interlocking of the interlocking connector 31 is normal. If they do not match, it indicates that the first plug connector 310 and the second plug connector 311 are not in contact and the interlocking of the interlocking connector 31 is abnormal. In one example, if the signal processing module 34 does not receive the second carrier signal, it indicates that the first plug connector 310 and the second plug connector 311 are not connected and the interlocking of the interlocking connector 31 is abnormal.

[0051] The interlocking detection circuit provided by the embodiments of the present application comprises an interlocking connector 31, the interlocking connector 31 comprises a first plug 310 and a second plug 311 electrically connected with the first plug 310, and the interlocking detection circuit further comprises a first coupling module 32, a second coupling module 33 and a signal processing module 34. The first plug 310 is signal connected with the first coupling module 32, and the second plug 311 is signal connected with the second coupling module 33. The signal processing module 34 is signal connected with the first coupling module 32 and the second coupling module 33 respectively, the signal processing module 34 is configured to output a first carrier signal to the first coupling module 32, so as to transmit the first carrier signal to the interlocking connector 31, and receive a second carrier signal output by the second coupling module 33. The signal processing module 34 is further configured to determine an interlocking state of the interlocking connector 31 according to the first carrier signal and the second carrier signal. In the case that a high-voltage terminal is missing, broken or inserted in a bent manner, so that the first plug 310 and the second plug 311 are not connected or in poor contact, the interlocking state of the interlocking connector 31 can be determined according to the first carrier signal and the second carrier signal, and the accuracy of interlocking detection is improved.

[0052] In some embodiments, referring to Figure 4 , the signal processing module 34 comprises a controller 340 and a transceiver unit 341 signal connected with the controller 340. The controller 340 is configured to output a first interlocking message to the transceiver unit 341, and can determine the interlocking state of the interlocking connector 31 by comparing the first interlocking message and a second interlocking message when the second interlocking message sent by the transceiver unit 341 is received;

[0053] The transceiver unit 341 is configured to output the first carrier signal to the first coupling module 32 according to the first interlocking message when the first interlocking message is received, and can send the second interlocking message to the controller 340 according to the second carrier signal when the second carrier signal is received from the second coupling module 33.

[0054] In this embodiment, the controller 340 communicates with the transceiver unit 341 through the CAN interface. Since the first interlock message cannot be transmitted directly through the high-voltage cable, after the controller 340 outputs the first interlock message to the transceiver unit 341, the transceiver unit 341 loads the first low-frequency interlock message onto the high-frequency signal to obtain the first carrier signal. The transceiver unit 341 outputs the first carrier signal to the first coupling module 32, and the first coupling module 32 couples the first carrier signal into the first plug 310. When the first plug 310 and the second plug 311 are normally connected, the first carrier signal can be transmitted from the first plug 310 to the second plug 311 and coupled to the second coupling module 33. At this time, the transceiver unit 341 receives the second carrier signal output by the second coupling module 33, analyzes the second carrier signal to obtain the second interlock message, and sends the second interlock message to the controller 340. The controller 340 analyzes the first interlock message and the second interlock message. If they are consistent, it means that the first plug 310 and the second plug 311 are normally connected, and the interlock connector 31 is normally interlocked. If they are inconsistent, it means that the first plug 310 and the second plug 311 are not in good contact, and the interlock connector 31 is abnormally interlocked.

[0055] In some embodiments, the interlock detection circuit provided by the embodiments of the present application includes a plurality of interlock connectors 31. Specifically, the interlock connectors can be interlock connectors corresponding to the battery pack, the EAC, the PDU, the PTC, and the fast charging port, and the plurality of interlock connectors 31 are connected in parallel. The interlock detection circuit further includes a first switch for controlling the disconnection or connection between the transceiver unit 341 and the first coupling module 32 according to the instructions of the controller 340, the first switch being arranged one-to-one with the interlock connector 31; and / or a second switch for controlling the disconnection or connection between the transceiver unit 341 and the second coupling module 33 according to the instructions of the controller 340, the second switch being arranged one-to-one with the interlock connector 31.

[0056] The interlock detection circuit further includes a first coupling module 32 arranged one-to-one with the first plug 310, and a second coupling module 33 arranged one-to-one with the second plug 311; the first coupling module 32 connects the first plug 310, and the second coupling module 33 connects the second plug 311. When the interlock detection circuit includes a plurality of interlock connectors 31, it further includes a first coupling module 32 and a second coupling module 33 in the same number as the interlock connectors 31.

[0057] It should be noted that the signal processing module 34 outputs a first carrier signal to each first coupling module 32. Each first coupling module 32 couples the first carrier signal to the corresponding interlock connector 31, and the corresponding interlock connector 31 couples the first carrier signal to the corresponding second coupling module 33. The signal processing module 34 receives the second carrier signal output by each second coupling module 33. The first carrier signals output to each first coupling module 32 are different. After the signal processing module 34 parses the first interlock message in the first carrier signal and the second interlock message in the second carrier signal, it can determine the interlock status of each interlock connector 31 based on whether the corresponding first interlock message is consistent with the second interlock message, and can locate the faulty interlock connector 31.

[0058] In one example, when the interlock detection circuit includes a first switch and a second switch, the transceiver unit 341 can send the first carrier signal to the first coupling module 32 via the first switch and receive the second carrier signal output by the second coupling module 33 via the second switch. The transceiver unit 341 can also send the first carrier signal to the first coupling module 32 via the second switch and receive the second carrier signal output by the second coupling module 33 via the first switch.

[0059] Specifically, the controller 340 controls the transceiver unit 341 to send the first carrier signal to the corresponding first coupling module 32 by controlling the first switch to be closed, and controls the transceiver unit 341 to receive the second carrier signal output by the corresponding second coupling module 33 by controlling the second switch to be closed.

[0060] In one example, when the interlock detection circuit only includes the first switch and the first switch is set one-to-one with the interlock connector, the transceiver unit 341 can send the first carrier signal to the first coupling module 32 through the first switch and directly receive the second carrier signal output by the second coupling module 33.

[0061] In one example, when the interlock detection circuit only includes the second switch and the second switch is set one-to-one with the interlock connector 31, the transceiver unit 341 can directly send the first carrier signal to the first coupling module 32 and receive the second carrier signal output by the second coupling module 33 through the second switch.

[0062] In some embodiments, the interlock detection circuit includes multiple interlock connectors 31; it also includes a second switch for controlling the disconnection or connection between the transceiver unit 341 and the second coupling module 33 according to the instructions of the controller 340, and the second switch is set one-to-one with the interlock connector 31; each second switch adopts a radio frequency switch, and the controller 340 can control the multiple second switches to disconnect or connect in a time sequence.

[0063] In this embodiment, after the transceiver unit 341 sends the first carrier signal to the interlocking connector 31, the second switch can be controlled to disconnect or connect in a timed sequence, thereby controlling the time when the second carrier signal is received, thereby realizing time-sharing judgment of the interlocking status of multiple interlocking connectors 31.

[0064] Specifically, in order to prevent the first carrier signal and the second carrier signal from attenuating during transmission, the first switch and the second switch are radio frequency switches, and the controller 340 (MCU) controls the disconnection or connection of the radio frequency switches.

[0065] In some embodiments, the interlock detection circuit further includes at least two first switches for controlling the disconnection or connection between the transceiver unit 341 and the first coupling module 32 according to instructions from the controller 340 .

[0066] See also Figure 5 The first switch is a switch for controlling the transmission of the first carrier signal (such as SW1 or SW2 in the figure). When the first switch is closed, the signal processing module 34 is connected to the first coupling module 32, so that the signal processing module 34 can output the first carrier signal to the first coupling module 32. The second switch is a switch for controlling the reception of the second carrier signal (such as SW3, SW4, SW5, SW6, or SW7 in the figure). When the second switch is closed, the signal processing module 34 is connected to the second coupling module 33, so that the signal processing module 34 can receive the second carrier signal output by the second coupling module 33.

[0067] It should be noted that the number of first switches depends on the number of high-voltage cable networks in the high-voltage circuit. When there is only one network, the signal processing module 34 transmits a first carrier signal to one of the first coupling modules 32. After the first carrier signal is coupled to the corresponding interlock connector 31, it is transmitted to the remaining interlock connectors 31 via the high-voltage cable. The interlock connectors 31 then couple the first carrier signal to the corresponding second coupling modules 33, thereby outputting the corresponding second carrier signal.

[0068] See also Figure 6 , the high-voltage relay on the fast-charging port side separates the high-voltage network, so the number of networks is two. At this time, the first carrier signal cannot be transmitted to the interlock connector 31 on the fast-charging port side through the high-voltage cable. Therefore, it is necessary to send the first carrier signal separately to the first coupling module 32 on the fast-charging port side. At this time, the number of first switches is two.

[0069] In some embodiments, as Figure 5As shown, the transceiver unit 341 includes a PLC transceiver; the controller 340 is electrically connected to a first terminal of the PLC transceiver, and a second terminal of the PLC transceiver is connected to the first terminal of each first switch and the first terminal of each second switch. The second terminal of each first switch is connected to the first coupling module 32, and the second terminal of each second switch is connected to the second coupling module 33.

[0070] When the first switch is closed, the PLC transceiver sends the first carrier signal to the first coupling module 32 through the first switch. When the second switch is closed in a time-sharing manner, the PLC transceiver receives the second carrier signal output by each second coupling module 33 in a time-sharing manner through the second switch.

[0071] The PLC transceiver can be a DCAN500 series chip, which integrates a high-frequency oscillator, modulator, demodulator, amplifier, and other components. The PLC transceiver loads the first interlock message onto a high-frequency signal with a frequency of 5MHz to 30MHz, amplifies it through the amplifier, and generates a first carrier signal. This signal is transmitted through the TXO port and received through the RXI port as a second carrier signal. After parsing the second interlock message, the PLC transceiver sends it to the controller 340 for comparison, thereby determining the interlock status of each interlock connector 31.

[0072] When only one PLC transceiver is receiving the second carrier signal, determining which interlock connector 31 is emitting the second carrier signal requires time-sharing reception of the second carrier signal. Therefore, time-sharing determination is necessary. If simultaneous determination is required, the same number of PLC transceivers as interlock connectors 31 can be provided to receive the second carrier signal.

[0073] Therefore, in some embodiments, the transceiver unit includes multiple PLC transceivers; the controller is electrically connected to the first end of each PLC transceiver, the second end of each PLC transceiver is connected to the first end of each first switch, and the second end of each PLC transceiver is connected to the first end of each second switch. The second end of each first switch is respectively connected to the first coupling module 32, and the second end of each second switch is respectively connected to the second coupling module 33. When the first switch is closed, the PLC transceiver transmits the first carrier signal to the multiple first coupling modules 32 via the first switch. When the second switch is closed, the corresponding PLC transceiver receives the second carrier signal output by the corresponding second coupling module 33 via the second switch.

[0074] It should be noted that when the controller 340 simultaneously receives second interlock messages sent by multiple PLC transceivers, if it is detected that the second interlock message sent by the third PLC transceiver is inconsistent with the corresponding first interlock message, it is determined that the interlock connector 31 corresponding to the third PLC transceiver is abnormally connected.

[0075] In some embodiments, as Figure 3 As shown, the interlock detection circuit also includes a positive high-voltage cable and a negative high-voltage cable, and the first plug connector 310 includes a first positive terminal and a first negative terminal; the first positive terminal of each first plug connector 310 is connected to the positive high-voltage cable, and the first negative terminal of each first plug connector 310 is connected to the negative high-voltage cable to connect multiple interlock connectors 31 in parallel.

[0076] See also Figure 3 The first coupling module 32 includes a first capacitor C1, a second capacitor C2, and a first transformer Q1. The first end of the first capacitor C1 is connected to the signal processing module 34 for receiving the first carrier signal transmitted by the signal processing module 34. The second end of the first capacitor C1 is connected to the first end of the first transformer Q1, which is grounded. The third end of the first transformer is connected to the first end of the second capacitor C2, the second end of the second capacitor C2 is connected to the first positive terminal, and the fourth end of the first transformer Q1 is connected to the first negative terminal. The first capacitor C1 and the inductor form a filter circuit that only allows high-frequency signals to pass. The second capacitor C2 and the transformer Q1 are used to isolate the high-voltage circuit from the low-voltage circuit.

[0077] The second plug connector 311 includes a second positive terminal and a second negative terminal. The second coupling module 33 includes a third capacitor C3, a fourth capacitor C4, and a second transformer Q2. The first terminal of the third capacitor C3 is connected to the signal processing module 34 for outputting the second carrier signal to the signal processing module 34. The second terminal of the third capacitor C3 is connected to the first terminal of the second transformer Q2, the second terminal of the second transformer Q2 is grounded, the third terminal of the second transformer Q2 is connected to the first terminal of the fourth capacitor C4, the second terminal of the fourth capacitor C4 is connected to the second positive terminal, and the fourth terminal of the second transformer Q2 is connected to the second negative terminal.

[0078] After the signal processing module 34 outputs the first carrier signal to the first coupling module 32, the first coupling module 32 couples the first carrier signal to the first plug connector 310. If the first plug connector 310 and the second plug connector 311 are properly connected, the first carrier signal is transmitted to the second plug connector 311. The second plug connector 311 couples the first carrier signal to the second coupling module 33. At this time, the first carrier signal is converted into a second carrier signal, and the second coupling module 33 outputs the second carrier signal to the signal processing module 34. If the signal processing module 34 does not receive the second carrier signal, it indicates that the first plug connector 310 and the second plug connector 311 are not connected. If the first carrier signal and the second carrier signal are inconsistent, it indicates that the first plug connector 310 and the second plug connector 311 are not in contact, thus determining the interlocking status of the interlock connector 31.

[0079] In one example, if Figure 7As shown, a signal processing module 34 is deployed on the BMS, and multiple interlocking connectors 31 include an interlocking connector 31 on the battery pack side, an interlocking connector 31 on the EAC side, and an interlocking connector 31 on the fast charging port side. The interlocking connector 31 includes a power supply end and a power consumption end, wherein when the first plug connector 310 is the power supply end, the second plug connector 311 is the power consumption end, and when the first plug connector 310 is the power consumption end, the second plug connector 311 is the power supply end. The first coupling module 32 is a coupling module that receives a first carrier signal (only two low-voltage terminals in the first coupling module 32 are shown in the figure), and the second coupling module 33 is a coupling module that outputs a second carrier signal (only two low-voltage terminals in the second coupling module 33 are shown in the figure).

[0080] The PLC transceiver transmits the first carrier signal to the first coupling module 32 on the battery pack side, and transmits the first carrier signal to the interlocking connector 31 on the EAC side through a high-voltage cable. Since the high-voltage relay on the fast-charging port side can only be closed when the interlocking state of the interlocking connector 31 on the fast-charging port side is normal, the first carrier signal cannot be transmitted to the interlocking connector 31 on the fast-charging port side through the high-voltage cable. Therefore, the first carrier signal is transmitted separately to the first coupling module 32 on the fast-charging port side. The first interlocking message contained in the first carrier signal transmitted twice may be the same or different. If they are different, the interlocking state of the corresponding interlocking connector 31 can be judged at the same time. If they are the same, it is necessary to control the time-sharing closure of the second switch, that is, to receive the corresponding second carrier signal in time-sharing, so that the interlocking state of each interlocking connector 31 can be judged.

[0081] The specific correspondence between the detection logic and the SW switch is shown in Table 1 below:

[0082] Table 1

[0083] battery pack EAC Fast charging port SW1 closure closure disconnect SW2 disconnect disconnect closure SW3 closure disconnect disconnect SW4 disconnect closure disconnect SW5 disconnect disconnect closure

[0084] To detect the interlocking status of the interlocking connector 31 on the battery pack side, the controller 340 controls SW1 and SW3 to close and SW2, SW4, and SW5 to open. To detect the interlocking status of the interlocking connector 31 on the EAC side, the controller 340 controls SW1 and SW4 to close and SW2, SW3, and SW5 to open. To detect the interlocking status of the interlocking connector 31 on the fast charging port side, the controller 340 controls SW2 and SW5 to close and SW1, SW3, and SW4 to open.

[0085] In some embodiments, to prevent mutual interference between the first coupling module 32 and the second coupling module 33, the interlock detection circuit includes a first isolator and a second isolator. The first coupling module 32 is located within the first isolator, and the second coupling module 33 is located within the second isolator. In one example, the first isolator and the second isolator can be located at one end near the interlock connector 31 or at the other end away from the interlock connector 31. Users can configure these configurations based on different needs.

[0086] In some other embodiments, the same interlock detection circuit can be used to connect and detect the electrical connection status of power-consuming terminals such as PDU and PTC; additional parallel detection branches can also be added, and the PDU, PTC and other power-consuming terminals can be connected to the interlock detection circuit in the same manner as the EAC detection circuit and in parallel with the EAC detection circuit, and signals can be sent and received in time to detect the electrical connection status of multiple power-consuming terminals.

[0087] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various modifications can be made within the scope of knowledge possessed by a person skilled in the art without departing from the spirit of the present invention. In addition, the embodiments of the present invention and the features of the embodiments can be combined with each other unless there is a conflict.

Claims

1. An interlock detection circuit, comprising an interlock connector, wherein the interlock connector comprises a first plug connector and a second plug connector electrically connected to the first plug connector, characterized in that: The interlock detection circuit further includes a first coupling module, a second coupling module and a signal processing module; The first plug connector is connected to the first coupling module by signal, and the second plug connector is connected to the second coupling module by signal; The signal processing module is signal-connected to the first coupling module and the second coupling module respectively, and the signal processing module is used to output a first carrier signal to the first coupling module to transmit the first carrier signal to the interlocking connector, and receive a second carrier signal output by the second coupling module; The signal processing module is further configured to determine an interlocking state of the interlocking connector according to the first carrier signal and the second carrier signal.

2. The interlock detection circuit according to claim 1, characterized in that: The signal processing module includes a controller and a transceiver unit connected to the controller by signal; The controller is configured to output a first interlock message to the transceiver unit, and upon receiving a second interlock message sent by the transceiver unit, determine the interlock state of the interlock connector by comparing the first interlock message with the second interlock message; The transceiver unit is configured to output the first carrier signal to the first coupling module according to the first interlock message when receiving the first interlock message, and to send the second interlock message to the controller according to the second carrier signal when receiving the second carrier signal from the second coupling module.

3. The interlock detection circuit according to claim 2, characterized in that: The interlock detection circuit includes a plurality of interlock connectors; and further includes: a first switch for controlling the disconnection or connection between the transceiver unit and the first coupling module according to an instruction of the controller, the first switch being provided on a one-to-one basis with the interlock connector; and / or a second switch for controlling the disconnection or connection between the transceiver unit and the second coupling module according to an instruction of the controller, the second switch being provided on a one-to-one basis with the interlock connector.

4. The interlock detection circuit according to claim 2, characterized in that: The interlock detection circuit includes multiple interlock connectors; and also includes a second switch for controlling the disconnection or connection between the transceiver unit and the second coupling module according to the instructions of the controller, and the second switch is set one-to-one with the interlock connector; each second switch is a radio frequency switch, and the controller can control the multiple second switches to disconnect or connect in a timed sequence.

5. The interlock detection circuit according to claim 4, characterized in that: The interlock detection circuit further includes at least two first switches for controlling the disconnection or connection between the transceiver unit and the first coupling module according to instructions from the controller.

6. The interlock detection circuit according to claim 1, wherein: The interlock detection circuit includes a first coupling module provided one-to-one with the first plug connector, and a second coupling module provided one-to-one with the second plug connector; the first coupling module is connected to the first plug connector, and the second coupling module is connected to the second plug connector.

7. The interlock detection circuit according to claim 1, characterized in that: The first coupling module includes a first capacitor, a second capacitor and a first transformer; the first plug connector includes a first positive terminal and a first negative terminal; The first end of the first capacitor is connected to the signal processing module, the second end of the first capacitor is connected to the first end of the first transformer, the second end of the first transformer is grounded, the third end of the first transformer is connected to the first end of the second capacitor, the second end of the second capacitor is connected to the first positive terminal, and the fourth end of the first transformer is connected to the first negative terminal.

8. The interlock detection circuit according to claim 1, wherein: The second plug connector includes a second positive terminal and a second negative terminal, and the second coupling module includes a third capacitor, a fourth capacitor and a second transformer; The first end of the third capacitor is connected to the signal processing module, the second end of the third capacitor is connected to the first end of the second transformer, the second end of the second transformer is grounded, the third end of the second transformer is connected to the first end of the fourth capacitor, the second end of the fourth capacitor is connected to the second positive terminal, and the fourth end of the second transformer is connected to the second negative terminal.

9. The interlock detection circuit according to claim 1, characterized in that: The interlock detection circuit includes a first isolator and a second isolator, the first coupling module is in the first isolator, and the second coupling module is in the second isolator.

10. A vehicle, characterized in that: The method comprises the interlock detection circuit according to any one of claims 1 to 9.

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