A high-voltage interlock circuit and circuit break detection method for electric vehicles

Abstract

The invention discloses a high-voltage interlock circuit of an electric vehicle and an open circuit detection method. The high-voltage interlock circuit includes an output voltage detection circuit, an output voltage conditioning circuit and an electric control unit. One end of the output voltage detection circuit is electrically connected to the low-voltage power supply, and the other end is grounded. The output voltage detection circuit includes a plurality of detection units connected in series, and each detection unit includes a bridge and a resistor connected in series. The bridge is integrated with the corresponding high-voltage connector. together, and disconnect before the high voltage connector. One end of the output voltage conditioning circuit is electrically connected to the connection point of the adjacent detection unit, and the other end is electrically connected to the electric control unit. The open circuit detection method is that the voltage detection circuit outputs a voltage detection signal to the electronic control unit through the output voltage conditioning circuit; the electronic control unit analyzes the voltage detection signal, diagnoses the integrity of the high-voltage interlock circuit, and judges the faulty high-voltage connector. Provide reference for maintenance and troubleshooting of automotive high-voltage circuits.

Description

technical field

[0001] The invention belongs to the technical field of high-voltage safety control of electric vehicles, and in particular relates to a high-voltage interlock circuit and a circuit break detection method of electric vehicles. Background technique

[0002] The high-voltage interlock circuit is a safety design measure for electric vehicles that uses low-voltage signals to monitor the integrity of the high-voltage circuit. Its monitoring target is the high-voltage connector in electric vehicles that requires human operation to switch on and off the circuit. When the vehicle is powered on or charged, if the high-voltage interlock circuit detects that the high-voltage circuit is incomplete, the system cannot be powered on or charged to avoid accidents due to problems such as virtual connections; if the vehicle collides and the high-voltage connector is loosened or repaired The high-voltage connector is loosened due to misoperation by personnel. By detecting the hi...

Examples

Embodiment 1

[0038]A high-voltage interlock circuit of an electric vehicle, the high-voltage interlock circuit is a low-voltage electrical connection circuit independent of the high-voltage circuit of the electric vehicle, the high-voltage interlock circuit includes an output voltage detection circuit, an output voltage circuit electrically connected to the output voltage detection circuit The voltage conditioning circuit and the electronic control unit ECU electrically connected to the output voltage conditioning circuit; one end of the output voltage detection circuit is electrically connected to the low-voltage power supply Vcc, and the other end is grounded. The output voltage detection circuit includes multiple pairs of bridges and resistors connected in series, and the bridge It is integrated with the corresponding high-voltage connector and the bridge is disconnected before the high-voltage connector when it is disconnected. The bridge can be generally understood as a wire. When the b...

Embodiment 2

[0045] For ease of description, in combination with the detection method given in the first embodiment above, figure 2 The high-voltage interlock circuit provided by Embodiment 2 of the present invention is given.

[0046] The output voltage detection circuit includes a first detection unit, a second detection unit, a third detection unit and a fourth detection unit connected in series; the first detection unit includes a first bridge JP1, a first resistor R1 connected to the first bridge JP1 The second detection unit includes a second bridge JP2 connected to the first resistor R1, and a second resistor R2 connected to the second bridge JP2; the third detection unit includes a third bridge JP3 connected to the second resistor R2, A third resistor R3 connected to the third bridge JP3; the fourth detection unit includes a fourth bridge JP4 connected to the third resistor R3, and a fourth resistor R4 connected to the fourth bridge JP4. The remaining end of the first bridge JP1 ...

technical field

[0001] The invention belongs to the technical field of high-voltage safety control of electric vehicles, and in particular relates to a high-voltage interlock circuit and a circuit break detection method of electric vehicles. Background technique

[0002] The high-voltage interlock circuit is a safety design measure for electric vehicles that uses low-voltage signals to monitor the integrity of the high-voltage circuit. Its monitoring target is the high-voltage connector in electric vehicles that requires human operation to switch on and off the circuit. When the vehicle is powered on or charged, if the high-voltage interlock circuit detects that the high-voltage circuit is incomplete, the system cannot be powered on or charged to avoid accidents due to problems such as virtual connections; if the vehicle collides and the high-voltage connector is loosened or repaired The high-voltage connector is loosened due to misoperation by personnel. By detecting the hi...

Examples

Embodiment 1

[0038]A high-voltage interlock circuit of an electric vehicle, the high-voltage interlock circuit is a low-voltage electrical connection circuit independent of the high-voltage circuit of the electric vehicle, the high-voltage interlock circuit includes an output voltage detection circuit, an output voltage circuit electrically connected to the output voltage detection circuit The voltage conditioning circuit and the electronic control unit ECU electrically connected to the output voltage conditioning circuit; one end of the output voltage detection circuit is electrically connected to the low-voltage power supply Vcc, and the other end is grounded. The output voltage detection circuit includes multiple pairs of bridges and resistors connected in series, and the bridge It is integrated with the corresponding high-voltage connector and the bridge is disconnected before the high-voltage connector when it is disconnected. The bridge can be generally understood as a wire. When the b...

Embodiment 2

[0045] For ease of description, in combination with the detection method given in the first embodiment above, figure 2 The high-voltage interlock circuit provided by Embodiment 2 of the present invention is given.

[0046] The output voltage detection circuit includes a first detection unit, a second detection unit, a third detection unit and a fourth detection unit connected in series; the first detection unit includes a first bridge JP1, a first resistor R1 connected to the first bridge JP1 The second detection unit includes a second bridge JP2 connected to the first resistor R1, and a second resistor R2 connected to the second bridge JP2; the third detection unit includes a third bridge JP3 connected to the second resistor R2, A third resistor R3 connected to the third bridge JP3; the fourth detection unit includes a fourth bridge JP4 connected to the third resistor R3, and a fourth resistor R4 connected to the fourth bridge JP4. The remaining end of the first bridge JP1 ...

Images