High-voltage interlock system and detection method thereof

Patent metadata

Field	Value
Publication number	US-10870353-B2
Application number	US-201916357558-A
Country	US
Kind code	B2
Filing date	Mar 19, 2019
Priority date	Sep 21, 2018
Publication date	Dec 22, 2020
Grant date	Dec 22, 2020

Abstract

The present disclosure provides a high-voltage interlock system and a detection method thereof. The high-voltage interlock system includes a target control device and at least one non-target control device connected in sequence. The target control device includes a detection unit, a current generation controller, a current generator, and a second high-voltage component. A controller in the target control device generates a pulse drive signal for driving the current generation controller, receives a detection result signal output from a current detector, and determines a fault of a high-voltage interlock circuit according to the detection result signal; the current generation controller generates an alternating voltage signal according to the pulse drive signal; the current generator outputs an alternating current signal according to the alternating voltage signal; the current detector acquires a voltage signal across a detection resistor set and outputs the detection result signal.

First claim

What is claimed is:

1. A high-voltage interlock system comprising: a target control device and at least one non-target control device connected in sequence, wherein
the non-target control device comprises a detection unit and a first high-voltage component; the detection unit comprises a controller, a current detector, and a detection resistor set; the controller is connected to the current detector, and configured to receive a detection result signal output by the current detector and determine a fault of a high-voltage interlock circuit according to the detection result signal; the current detector is connected to the detection resistor set, and configured to acquire a voltage signal across the detection resistor set and output the detection result signal according to the voltage signal; the first high-voltage component is connected to the detection unit;
the target control device comprises the detection unit, a current generation controller, a current generator, and a second high-voltage component; a controller in the target control device is connected to the current generation controller, and configured to generate a pulse drive signal for driving the current generation controller; the current generation controller is connected to the current generator, and configured to generate an alternating voltage signal according to the pulse drive signal; the current generator is connected to a detection resistor set in the target control device, and configured to output an alternating current signal according to the alternating voltage signal; the second high-voltage component is connected to the current generator and the detection resistor set in the target control device; and
the current generator, the second high-voltage component, the detection resistor set in the target control device together with the detection resistor set and the first high-voltage component in the at least one non-target control device form the high-voltage interlock circuit in which the alternating current signal is transmitted;
wherein the current generation controller comprises a logic control circuit, a drive circuit, a current direction control circuit, and a first power source;
the logic control circuit is connected to the drive circuit and the controller in the target control device, and configured to generate a control signal for controlling the drive circuit based on the pulse drive signal;
the drive circuit is connected to the current direction control circuit and configured to control, based on the control signal, the current direction control circuit to control a direction of the alternating voltage signal;
the first power source has a positive pole connected to the current direction control circuit and is configured to supply power to the current direction control circuit; and
the current direction control circuit is connected to a negative pole of the first power source, and configured to control the alternating voltage signal to periodically change its direction in the current direction control circuit under the control of the drive circuit.

2. The high-voltage interlock system of claim 1 , wherein:
the current direction control circuit comprises a first switch, a second switch, a third switch, a fourth switch, a first external terminal, and a second external terminal;
an end of the first switch and an end of the second switch are both connected to the first power source, the other end of the first switch is connected to an end of the third switch, the other end of the second switch is connected to an end of the fourth switch, and the other end of the third switch and the other end of the fourth switch are both connected to ground; and
the first external terminal is connected to the other end of the first switch and the end of the third switch, and the second external terminal is connected to the other end of the second switch and the end of the fourth switch.

3. The high-voltage interlock system of claim 1 , wherein the current generator comprises a first constant current source, a second constant current source, a third constant current source, a fourth constant current source, a first current regulating resistor set, a second current regulating resistor set, a third current regulating resistor set, a fourth current regulating resistor set, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a seventh diode, an eighth diode, a first voltage dividing resistor set, and a second voltage dividing resistor set;
a first input terminal of the first constant current source is connected to the current generation controller, a cathode of the first diode, and a cathode of the second diode, a second input terminal of the first constant current source is connected to an end of the first current regulating resistor set and an anode of the third diode, an output end of the first constant current source is connected to an anode of the first diode, the other end of the first current regulating resistor set, and an end of the first voltage dividing resistor set, and the other end of the first voltage dividing resistor set is connected to ground;
a first input terminal of the second constant current source is connected to a cathode of the third diode, a cathode of the fourth diode, and an end of the detection resistor set in the target control device, a second input terminal of the second constant current source is connected to an anode of the second diode and an end of the second current regulating resistor set, and an output end of the second constant current source is connected to an anode of the fourth diode and the other end of the second current regulating resistor set;
a first input terminal of the third constant current source is connected to the current generation controller, a cathode of the fifth diode, and a cathode of the sixth diode, a second input terminal of the third constant current source is connected to an end of the third current regulating resistor set and an anode of the seventh diode, an output end of the third constant current source is connected to an anode of the fifth diode, the other end of the third current regulating resistor set, and an end of the second voltage dividing resistor set, and the other end of the second voltage dividing resistor set is connected to the ground; and
a first input terminal of the fourth constant current source is connected to a cathode of the seventh diode, a cathode of the eighth diode, and an end of the detection resistor set in the non-target control device, a second input terminal of the fourth constant current source is connected to an anode of the sixth diode and an end of the fourth current regulating resistor set, and an output end of the fourth constant current source is connected to an anode of the eighth diode and the other end of the fourth current regulating resistor set.

4. The high-voltage interlock system of claim 3 , further comprising a first source detection unit and a second source detection unit, wherein:
the first source detection unit is connected to a detection terminal of the first voltage dividing resistor set, and configured to detect the first constant current source and the current generator; and
the second source detection unit is connected to a detection terminal of the second voltage dividing resistor set, and configured to detect the third constant current source and the current generator.

5. The high-voltage interlock system of claim 3 , further comprising a first capacitor set and a second capacitor set, wherein:
an end of the first capacitor set is connected to the first input terminal of the second constant current source, and the other end of the first capacitor set is connected to the ground; and
an end of the second capacitor set is connected to the first input terminal of the fourth constant current source

Assignees

• Contemporary Amperex Technology Co Ltd

Inventors

• Zeng Yuqun
• Wu Kai
• Dai Wei
• Wang Chao
• Li Qiandeng

Classifications

• G01R31/50 Primary

  Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections (testing of sparking plugs H01T13/58) · CPC title

• G01R31/006 Primary

  on road vehicles, e.g. automobiles or trucks (testing of ignition installations peculiar to internal combustion engines F02P17/00) · CPC title

• G01R31/54

  Testing for continuity · CPC title

• G01R31/52

  Testing for short-circuits, leakage current or ground faults · CPC title

• B60L3/04 Primary

  Cutting off the power supply under fault conditions (protective devices and circuit arrangements in general H01H; H02H) · CPC title