High-voltage interlocking detection circuit and vehicle

Abstract

The utility model discloses a high-voltage interlocking detection circuit and a vehicle. The high-voltage interlocking detection circuit comprises a high-voltage loop; the signal source is used for outputting a detection signal; the first end of the sampling resistor is connected with the first end of the signal source, and the second end of the sampling resistor is connected with the high-voltage loop, so that when the detection signal is output, the high-voltage interlocking state of the high-voltage loop is detected through the voltage value of the sampling resistor. By adopting the circuit, the cost of high-voltage interlocking detection can be reduced.

Description

Technical Field

[0001] The present application relates to the field of computer technology, and more particularly, to a high-voltage interlock detection circuit and a vehicle. Background Art

[0002] In order to avoid harm to the human body caused by high voltage electricity and ensure the safe operation of the vehicle, corresponding detection logic or detection circuit is usually designed on the vehicle to detect the high voltage interlock status.

[0003] Existing detection schemes can be Figure 1 As shown, the BMS (Battery Management System) can be controlled to output a PWM (Pulse Width Modulation) signal. Furthermore, for each high-voltage component in the high-voltage circuit, the PWM signal can be input from the low-voltage connector of the high-voltage component to the high-voltage connector port via two low-voltage wire harnesses. A shorting wire harness is provided on the connector terminals of the high-voltage wire harness to form a PWM signal loop. By detecting the state of the PWM signal loop, the high-voltage interlock status can be detected.

[0004] Because in the existing detection scheme, each high-voltage component has two low-voltage wiring harnesses and a reserved plug-in interface, the detection cost is relatively high. Utility Model Content

[0005] In view of the above problems, the present application proposes a high-voltage interlock detection circuit and a vehicle to improve the above problems.

[0006] In a first aspect, the present application provides a high-voltage interlock detection circuit, comprising: a high-voltage circuit; a signal source for outputting a detection signal; a sampling resistor, wherein a first end of the sampling resistor is connected to a first end of the signal source, and a second end of the sampling resistor is connected to the high-voltage circuit, so that when the detection signal is output, the high-voltage interlock state of the high-voltage circuit is detected by the voltage value of the sampling resistor.

[0007] In a second aspect, the present application provides a vehicle, comprising a vehicle body and the above-mentioned high-voltage interlock detection circuit, wherein the high-voltage interlock detection circuit is arranged in the vehicle body.

[0008] The utility model provides a high-voltage interlock detection circuit, which includes a high-voltage circuit; a signal source for outputting a detection signal; and a sampling resistor, wherein a first end of the sampling resistor is connected to a first end of the signal source, and a second end of the sampling resistor is connected to the high-voltage circuit. When the detection signal is output, the high-voltage interlock state of the high-voltage circuit is detected by the voltage value of the sampling resistor. By directly connecting the signal source and the sampling resistor to the high-voltage circuit, the high-voltage interlock state of the high-voltage circuit can be detected by the voltage value of the sampling resistor when the detection signal of the signal source is output. By adopting the above circuit, the cost of high-voltage interlock detection can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0010] Figure 1 A schematic diagram of an existing detection scheme provided by this application is shown;

[0011] Figure 2 A schematic structural diagram of a high-voltage interlock detection circuit according to an embodiment of the present application is shown;

[0012] Figure 3 A schematic structural diagram of a high-voltage interlock detection circuit according to an embodiment of the present application is shown;

[0013] Figure 4 A schematic structural diagram of a high-voltage interlock detection circuit according to an embodiment of the present application is shown;

[0014] Figure 5 A schematic diagram of an equivalent circuit proposed in this application is shown;

[0015] Figure 6 shows a schematic diagram of another equivalent circuit proposed in this application;

[0016] Figure 7 A schematic diagram showing the existing detection scheme provided by this application and the scheme provided by this application;

[0017] Figure 8 A structural block diagram of a vehicle provided by the present application is shown.

[0018] Icons: 100-high-voltage interlock detection circuit; 110-high-voltage circuit; 120-signal source; 130-sampling resistor; 140-coupling circuit; 141-coupling resistor; 142-coupling capacitor; 111-high-voltage bus; 112-power battery; 113-high-voltage component module; 1131-high-voltage compressor CMPR; 1132-power system IPS; 1133-electric drive system DCU; 1134-heater PTC; 11311-first common-mode capacitor of high-voltage compressor CMPR; 11312-second common-mode capacitor of high-voltage compressor CMPR; 11313-high-voltage compressor CMPR Differential mode capacitance of PR; 11321-first common mode capacitance of power supply system IPS; 11322-second common mode capacitance of power supply system IPS; 11323-differential mode capacitance of power supply system IPS; 11331-first common mode capacitance of electric drive system DCU; 11332-second common mode capacitance of electric drive system DCU; 11333-differential mode capacitance of electric drive system DCU; 11341-first common mode capacitance of heater PTC; 11342-second common mode capacitance of heater PTC; 11343-differential mode capacitance of heater PTC; 114-first relay; 115-second relay. DETAILED DESCRIPTION

[0019] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0020] In an embodiment of the present application, the inventors propose a high-voltage interlock detection circuit and a vehicle. The high-voltage interlock detection circuit includes a high-voltage circuit; a signal source for outputting a detection signal; and a sampling resistor, wherein the first end of the sampling resistor is connected to the first end of the signal source, and the second end of the sampling resistor is connected to the high-voltage circuit, so that when the detection signal is output, the high-voltage interlock state of the high-voltage circuit can be detected by the voltage value of the sampling resistor. By directly connecting the signal source and the sampling resistor to the high-voltage circuit, the high-voltage interlock state of the high-voltage circuit can be detected by the voltage value of the sampling resistor when the detection signal of the signal source is output. By adopting the above circuit, the cost of high-voltage interlock detection can be reduced.

[0021] The high-voltage interlock detection circuit provided in the embodiments of the present application will be described in detail below through specific embodiments.

[0022] See also Figure 2 , which shows a block diagram of a high-voltage interlock detection circuit provided by an embodiment of the present application. The high-voltage interlock detection circuit 100 may include: a high-voltage loop 110, a signal source 120, and a sampling resistor 130.

[0023] Among them, the signal source 120 can be used to output a detection signal; the first end of the sampling resistor 130 can be connected to the first end of the signal source, and the second end of the sampling resistor 130 can be connected to the high-voltage circuit 110, so that when the detection signal is output, the high-voltage interlock state of the high-voltage circuit 110 can be detected through the voltage value of the sampling resistor 130.

[0024] Signal source 120 may be a battery management system (BMS). A vehicle's BMS can monitor battery status, such as temperature, voltage, and current; control battery charge and discharge processes to ensure the battery operates within a safe operating range; balance the performance of individual cells within the battery pack to prevent overcharging or over-discharging; predict battery health and lifespan to provide early warning of potential problems; protect the battery from damage in the event of a fault; and optimize battery performance to improve energy efficiency.

[0025] The detection signal can be used to detect the high-voltage interlock status of the high-voltage circuit 110. The high-voltage interlock status can be understood as whether the high-voltage components in the high-voltage circuit 110 are properly connected. Whether the high-voltage components are properly connected can be understood as whether the high-voltage connector is disconnected. In the embodiment of the present application, the detection signal can be a sine wave signal with an output frequency of f (e.g., 10 kHz).

[0026] The sampling resistor 130 may be used to detect the resistance of the high-voltage interlocking state of the high-voltage circuit 110 .

[0027] This embodiment proposes a high-voltage interlock detection circuit that directly connects a signal source and a sampling resistor to a high-voltage circuit. When the signal source outputs a detection signal, the voltage across the sampling resistor can be used to detect the high-voltage interlock state of the high-voltage circuit. This circuit reduces the cost of high-voltage interlock detection.

[0028] In some embodiments, see Figure 3 , which shows a structural block diagram of a high-voltage interlock detection circuit provided by an embodiment of the present application, wherein the second end of the sampling resistor 130 is connected to the high-voltage loop 110 via a coupling circuit 140 .

[0029] The coupling circuit 140 may include a coupling resistor 141 and a coupling capacitor 142 , wherein a first end of the coupling resistor 141 is connected to the sampling resistor 130 , a second end of the coupling resistor 141 is connected to a first end of the coupling capacitor 142 ; and a second end of the coupling capacitor 142 is connected to the high-voltage circuit 110 .

[0030] In this embodiment, the coupling circuit 140 is a resistor-capacitor coupling circuit, which can achieve effective signal transmission. The signal input to the coupling circuit 140 is transmitted to the high-voltage loop 110 through the coupling capacitor 142, which can improve the transmission efficiency and maintain signal integrity. This is equivalent to transmitting a sinusoidal wave signal to the high-voltage loop 110 through the coupling circuit 140 in this embodiment.

[0031] The high-voltage circuit 110 may include a high-voltage bus 111 , a second end of the coupling capacitor 142 is connected to the negative electrode of the high-voltage bus 111 in the high-voltage circuit, and a second end of the signal source 120 is grounded.

[0032] In some embodiments, see Figure 4 , which shows a block diagram of the high-voltage interlock detection circuit provided by an embodiment of the present application. The high-voltage circuit may include a power battery 112, a high-voltage bus 111, and a high-voltage component module 113. The positive electrode of the power battery 112 is connected to the positive electrode of the high-voltage bus 111, and the negative electrode of the power battery 112 is connected to the negative electrode of the high-voltage bus 111. The power battery 112 can be used to power the high-voltage component module 113; the input end of the high-voltage component module 113 is connected to the positive electrode of the high-voltage bus 111, and the output end of the high-voltage component module 113 is connected to the negative electrode of the high-voltage bus 111; and the second end of the sampling resistor 130 is connected to the output end of the high-voltage component module 113.

[0033] Among them, the high-voltage component module 113 includes at least two high-voltage components among the high-voltage compressor (CMPR) 1131, the power supply system (IPS) 1132, the electric drive system (DCU) 1133 and the heater (PTC) 1134, and the at least two high-voltage components can be connected to each other in parallel through the high-voltage bus 111.

[0034] Each high-voltage component is provided with a high-voltage connector, and each high-voltage component can be connected in parallel with the high-voltage busbar 111 through the high-voltage connector.

[0035] In which, each high-voltage component can include a first common-mode capacitor, a second common-mode capacitor and a differential-mode capacitor, the first end of the first common-mode capacitor is connected to the positive pole of the high-voltage bus 111, and the second end of the first common-mode capacitor is grounded; the first end of the second common-mode capacitor is connected to the negative pole of the high-voltage bus 111, and the second end of the second common-mode capacitor is grounded; the first end of the differential-mode capacitor is connected to the positive pole of the high-voltage bus 111, and the second end of the differential-mode capacitor is connected to the negative pole of the high-voltage bus 111.

[0036] Among them, differential mode capacitors (X capacitors) can be used to suppress differential mode interference, that is, interference between two wires (the positive and negative poles of the high-voltage bus). Common mode capacitors (Y capacitors) can be used to suppress common mode interference, that is, interference between a wire and the ground wire. The first common mode capacitor can reduce interference caused by voltage and current changes between the positive pole of the high-voltage bus and the ground wire, and the second common mode capacitor can reduce interference caused by voltage and current changes between the negative pole of the high-voltage bus and the ground wire.

[0037] The high-voltage circuit 110 further includes a first relay 114 and a second relay 115 . The positive electrode of the power battery 112 is connected to the positive electrode of the high-voltage bus 111 through the first relay 114 , and the negative electrode of the power battery 112 is connected to the negative electrode of the high-voltage bus 111 through the second relay 113 .

[0038] The first relay 114 and the second relay 115 may be high-voltage DC relays.

[0039] Please refer again Figure 4 When the high-voltage component module 113 includes four high-voltage components, namely, a high-voltage compressor 1131, a power supply system 1132, an electric drive system 1133 and a heater 1134, the first end of the first common-mode capacitor 11311 in the high-voltage compressor 1131 is connected to the positive electrode of the high-voltage bus 111, and the second end of the first common-mode capacitor 11311 is grounded; the first end of the second common-mode capacitor 11312 is connected to the negative electrode of the high-voltage bus 111, and the second end of the second common-mode capacitor 11312 is grounded; the first end of the differential-mode capacitor 11313 is connected to the positive electrode of the high-voltage bus 111, and the second end of the differential-mode capacitor 11313 is connected to the negative electrode of the high-voltage bus 111.

[0040] The first end of the first common-mode capacitor 11321 in the power supply system 1132 is connected to the positive electrode of the high-voltage bus 111, and the second end of the first common-mode capacitor 11321 is grounded; the first end of the second common-mode capacitor 11322 is connected to the negative electrode of the high-voltage bus 111, and the second end of the second common-mode capacitor 11322 is grounded; the first end of the differential-mode capacitor 11323 is connected to the positive electrode of the high-voltage bus 111, and the second end of the differential-mode capacitor 11323 is connected to the negative electrode of the high-voltage bus 111.

[0041] The first end of the first common-mode capacitor 11331 in the electric drive system 1133 is connected to the positive electrode of the high-voltage bus 111, and the second end of the first common-mode capacitor 11331 is grounded; the first end of the second common-mode capacitor 11332 is connected to the negative electrode of the high-voltage bus 111, and the second end of the second common-mode capacitor 11332 is grounded; the first end of the differential-mode capacitor 11333 is connected to the positive electrode of the high-voltage bus 111, and the second end of the differential-mode capacitor 11333 is connected to the negative electrode of the high-voltage bus 111.

[0042] The first end of the first common-mode capacitor 11341 in the heater 1134 is connected to the positive pole of the high-voltage bus 111, and the second end of the first common-mode capacitor 11341 is grounded; the first end of the second common-mode capacitor 11342 is connected to the negative pole of the high-voltage bus 111, and the second end of the second common-mode capacitor 11342 is grounded; the first end of the differential-mode capacitor 11343 is connected to the positive pole of the high-voltage bus 111, and the second end of the differential-mode capacitor 11343 is connected to the negative pole of the high-voltage bus 111.

[0043] It should be noted that Figure 4 R in sir 、z b , z1~z4 are predetermined equivalent circuit parameters, not real components, where R sir It can refer to the insulation resistance of the high voltage bus 111, z b It can refer to the impedance of the power battery 112 under the detection signal with an output frequency of f, z1 can refer to the impedance of the high-pressure compressor 1131 under the detection signal with an output frequency of f, z2 can refer to the impedance of the power supply system 1132 under the detection signal with an output frequency of f, z3 can refer to the impedance of the electric drive system 1133 under the detection signal with an output frequency of f, and z4 can refer to the impedance of the heater 1134 under the detection signal with an output frequency of f.

[0044] Furthermore, it should be noted that, typically, the high-voltage component itself is provided with a first common-mode capacitor, a second common-mode capacitor, and a differential-mode capacitor. The first common-mode capacitor, the second common-mode capacitor, and the differential-mode capacitor provided by the high-voltage component itself can function as a filter. If a high-voltage component itself is not provided with a first common-mode capacitor and a second common-mode capacitor, the first common-mode capacitor and the second common-mode capacitor can be added to the high-voltage component first. In this embodiment, the first common-mode capacitor and the second common-mode capacitor can be used to detect whether the high-voltage component is in a high-voltage interlock state.

[0045] In this embodiment, when the connector of the high-voltage component is in an inserted state or an unplugged state, the Y capacitor can be connected to or exited from the detection circuit, thereby causing the voltage value of the sampling resistor to change. Therefore, the high-voltage interlock state of the high-voltage circuit can be determined by the voltage value of the sampling resistor. In some embodiments, a detection head can be set at the sampling resistor, and the voltage value of the sampling resistor is obtained by the detection head. The voltage value is compared with a preset voltage value (the sampling resistor voltage value obtained by the equivalent circuit when all high-voltage components in the high-voltage circuit are in a high-voltage interlock state) to obtain a comparison result, and the high-voltage interlock state of the high-voltage circuit is determined based on the comparison result. Since the circuit will be interfered by various factors during actual application, there will be differences between the measured value and the calculated value. Therefore, in order to improve the accuracy of the judgment, if the difference between the voltage value and the preset voltage value is within a preset range, it can be determined that all high-voltage components in the high-voltage circuit are in a high-voltage interlock state.

[0046] When the high-voltage component module includes four high-voltage components, namely CMPR, IPS, DCU and PTC, and all high-voltage components in the high-voltage circuit are in the high-voltage interlock state, the equivalent circuit can be as follows: Figure 5 As shown, the calculation formula of CMPR port impedance can be:

[0047]

[0048] Among them, z1 can represent the impedance of CMPR when the detection signal is output, f can represent the output frequency of the detection signal, C x1 The capacitance value of the differential mode capacitor that can represent CMPR, C y1 The capacitance value of the first common-mode capacitor may represent CMPR.

[0049] The calculation formula of IPS port impedance can be:

[0050]

[0051] Among them, z2 can represent the impedance of IPS when the detection signal is output, f can represent the output frequency of the detection signal, C x2 It can represent the capacitance value of the differential mode capacitance of IPS, C y3 It can represent the capacitance value of the first common-mode capacitor of IPS.

[0052] The calculation formula of DCU port impedance can be:

[0053]

[0054] Among them, z3 can represent the impedance of DCU when the detection signal is output, f can represent the output frequency of the detection signal, C x3 It can represent the capacitance value of the differential mode capacitor of DCU, C y5 It can represent the capacitance value of the first common-mode capacitor of the DCU.

[0055] The calculation formula of PTC port impedance can be:

[0056]

[0057] Among them, z4 can represent the impedance of PTC when the detection signal is output, f can represent the output frequency of the detection signal, C x4 It can represent the capacitance value of the differential mode capacitor of PTC, C y7 It can represent the capacitance value of the first common-mode capacitor of the PTC.

[0058] The calculation formula for the total impedance of the high-voltage circuit can be:

[0059]

[0060] Among them, Z1 can represent the z in the equivalent circuit b and z b The impedance of the subsequent circuit, z b It can refer to the impedance of the power battery, and Z2 can represent C in the equivalent circuit. y2 、C y4 、C y6 、C y8 The impedance of the parallel circuit formed, Z3 can represent the total impedance of the high voltage circuit, The impedance of the second common-mode capacitor that can represent CMPR, It can represent the impedance of the second common mode capacitor of IPS, It can represent the impedance of the second common-mode capacitor of DCU, It can represent the impedance of the second common mode capacitance of the PTC, Can be expressed and Multiply.

[0061] The calculation formula of the preset voltage value can be:

[0062]

[0063] Among them, V P1 It can represent the voltage value of the signal source, R1 can represent the resistance value of the sampling resistor, R in Can represent the resistance value of the coupling resistor, Z cin Can represent the impedance of the coupling capacitor, R sir It can represent the insulation resistance of high voltage busbar.

[0064] In actual situations, the capacitance value of the differential mode capacitor is >> the capacitance value of the common mode capacitor, R sir The unit can be MΩ, so the calculation formula of the preset voltage value is can be simplified to:

[0065]

[0066] in, The impedance of the first common-mode capacitor that can represent CMPR is, It can represent the impedance of the first common mode capacitor of IPS, It can represent the impedance of the first common mode capacitor of DCU, It can represent the impedance of the first common mode capacitance of the PTC.

[0067]

[0068] When the high-voltage component module includes four high-voltage components, namely CMPR, IPS, DCU and PTC, and the PTC in the high-voltage circuit is not in the high-voltage interlock state, the equivalent circuit can be as follows: Figure 6 As shown, the calculation formula of CMPR port impedance can be:

[0069]

[0070] Among them, z1 can represent the impedance of CMPR when the detection signal is output, f can represent the output frequency of the detection signal, C x1 The capacitance value of the differential mode capacitor that can represent CMPR, C y1 The capacitance value of the first common-mode capacitor may represent CMPR.

[0071] The calculation formula of IPS port impedance can be:

[0072]

[0073] Among them, z2 can represent the impedance of IPS when the detection signal is output, f can represent the output frequency of the detection signal, C x2 It can represent the capacitance value of the differential mode capacitance of IPS, C y3 It can represent the capacitance value of the first common-mode capacitor of IPS.

[0074] The calculation formula of DCU port impedance can be:

[0075]

[0076] Among them, z3 can represent the impedance of DCU when the detection signal is output, f can represent the output frequency of the detection signal, C x3 It can represent the capacitance value of the differential mode capacitor of DCU, C y5 It can represent the capacitance value of the first common-mode capacitor of the DCU.

[0077] The calculation formula for the total impedance of the high-voltage circuit can be:

[0078]

[0079] Among them, Z1 can represent the z in the equivalent circuit b and z b The impedance of the subsequent circuit, Z2, can represent the total impedance of the high voltage circuit, Z cy2 The impedance of the second common-mode capacitor, Z, can be expressed as CMPR. cy4 It can represent the impedance of the second common mode capacitor of IPS, Z cy6 It can represent the impedance of the second common-mode capacitor of the DCU.

[0080] At this time, the calculation formula for the voltage value of the sampling resistor can be:

[0081]

[0082] Among them, V P1 It can represent the voltage value of the signal source, R1 can represent the resistance value of the sampling resistor, R in Can represent the resistance value of the coupling resistor, Z cin Can represent the impedance of the coupling capacitor, R sir It can represent the insulation resistance of high voltage busbar.

[0083] In actual situations, the capacitance value of the differential mode capacitor is >> the capacitance value of the common mode capacitor, R sir The unit can be MΩ, so the calculation formula of the preset voltage value is can be simplified to:

[0084]

[0085] in, The impedance of the first common-mode capacitor that can represent CMPR is, It can represent the impedance of the first common mode capacitor of IPS, It can represent the impedance of the first common mode capacitor of DCU, It can represent the impedance of the first common mode capacitance of the PTC.

[0086] It can be seen from the above formula that the voltage of the sampling resistor is related to the Y capacitor of the high-voltage component, but has nothing to do with the X capacitor that must exist in the high-voltage component itself, and the voltage value of the sampling resistor when the high-voltage component is not in the high-voltage interlocking state is less than the voltage value of the sampling resistor when the high-voltage circuit is in the high-voltage interlocking state. Optionally, when the Y capacitors of all high-voltage components are different, multiple preset voltage values ​​can be set, and by comparing the obtained voltage value with multiple preset voltage values ​​(such as the voltage value in the high-voltage circuit interlocking state, the voltage value when only the PTC is disconnected, the voltage value when only the DCU is disconnected, the voltage value when the PTC and DCU are disconnected, etc.), it can be determined whether all high-voltage components in the high-voltage circuit are in the high-voltage interlocking state; and when there is a high-voltage component in the high-voltage circuit that is not in the high-voltage interlocking state, based on the comparison results of the voltage value with multiple preset voltage values, the high-voltage component that is not in the high-voltage interlocking state is determined, thereby improving the efficiency of fault detection.

[0087] The difference between the circuit provided in this embodiment and the circuit provided in the prior art can be seen as follows: Figure 7 As shown, Figure 7 In the existing solution shown in the figure above, each high-voltage component needs to reserve a low-voltage connector, and a detection loop needs to be formed through a low-voltage wiring harness and a PWM signal; Figure 7In the solution shown in the figure below, a sampling resistor and a coupling circuit are directly added to the high-voltage circuit, and the sampling resistor is connected to the sinusoidal wave detection signal to form a detection circuit, thereby reducing detection costs.

[0088] See also Figure 8 , Figure 8 The structural block diagram of the vehicle provided by an embodiment of the present application is shown below. Figure 8 The vehicle 200 includes a vehicle body 210 and the high-voltage interlock detection circuit 100 , wherein the high-voltage interlock detection circuit 100 is disposed in the vehicle body 210 .

[0089] In the embodiment of the present application, each functional module of the vehicle 200 can be integrated into a processing module, each module can exist physically separately, or two or more modules can be integrated into a single module. The above-mentioned integrated modules can be implemented in the form of hardware or software functional modules.

[0090] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the working process of the high-voltage interlock detection circuit 100 during the specific operation of the vehicle 200 can refer to the description of the corresponding process of the high-voltage interlock detection circuit 100 in the aforementioned embodiment, and will not be repeated here.

[0091] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A high voltage interlock detection circuit, characterized in that: include: High-voltage circuit; A signal source, used for outputting a detection signal; A sampling resistor, wherein a first end of the sampling resistor is connected to a first end of the signal source, and a second end of the sampling resistor is connected to the high-voltage circuit, so that when the detection signal is output, a high-voltage interlock state of the high-voltage circuit is detected by a voltage value of the sampling resistor.

2. The high-voltage interlock detection circuit according to claim 1, characterized in that: The second end of the sampling resistor is connected to the high-voltage loop through a coupling circuit.

3. The high-voltage interlock detection circuit according to claim 2, characterized in that: The coupling circuit includes a coupling resistor and a coupling capacitor, a first end of the coupling resistor is connected to the sampling resistor, and a second end of the coupling resistor is connected to the first end of the coupling capacitor; The second end of the coupling capacitor is connected to the high-voltage loop.

4. The high-voltage interlock detection circuit according to claim 3, characterized in that: The high-voltage circuit includes a high-voltage busbar, the second end of the coupling capacitor is connected to the negative electrode of the high-voltage busbar in the high-voltage circuit, and the second end of the signal source is grounded.

5. The high-voltage interlock detection circuit according to claim 1, characterized in that: The high-voltage circuit includes a power battery, a high-voltage busbar, and a high-voltage component module. The positive electrode of the power battery is connected to the positive electrode of the high-voltage busbar, and the negative electrode of the power battery is connected to the negative electrode of the high-voltage busbar. The power battery is used to power the high-voltage component module. The input end of the high-voltage component module is connected to the positive pole of the high-voltage bus, and the output end of the high-voltage component module is connected to the negative pole of the high-voltage bus; The second end of the sampling resistor is connected to the output end of the high-voltage component module.

6. The high-voltage interlock detection circuit according to claim 5, characterized in that: The high-voltage component module includes at least two high-voltage components among a high-voltage compressor CMPR, a power system IPS, an electric drive system DCU, and a heater PTC. The at least two high-voltage components are connected to each other in parallel via the high-voltage bus.

7. The high-voltage interlock detection circuit according to claim 6, characterized in that: Each of the high-voltage components includes a first common-mode capacitor, a second common-mode capacitor, and a differential-mode capacitor, wherein a first end of the first common-mode capacitor is connected to the positive electrode of the high-voltage bus, and a second end of the first common-mode capacitor is grounded; A first end of the second common-mode capacitor is connected to the negative electrode of the high-voltage bus, and a second end of the second common-mode capacitor is grounded; A first end of the differential mode capacitor is connected to the positive electrode of the high voltage bus, and a second end of the differential mode capacitor is connected to the negative electrode of the high voltage bus.

8. The high-voltage interlock detection circuit according to claim 5, characterized in that: The high-voltage circuit further includes a first relay and a second relay. The positive electrode of the power battery is connected to the positive electrode of the high-voltage bus through the first relay, and the negative electrode of the power battery is connected to the negative electrode of the high-voltage bus through the second relay.

9. The high-voltage interlock detection circuit according to any one of claims 1 to 8, characterized in that: The detection signal is a sinusoidal signal, and the signal source is a battery management system BMS.

10. A vehicle, characterized in that: It comprises a vehicle body and the high-voltage interlock detection circuit according to any one of claims 1 to 9, wherein the high-voltage interlock detection circuit is arranged on the vehicle body.

Images