Connection confirmation CC end resistance detection device, charger and electric vehicle
A connection confirmation and detection device technology, which is applied in the field of electrical systems and can solve problems such as electromagnetic interference and pollution resistance
Active Publication Date: 2018-12-07
BEIJING ELECTRIC VEHICLE
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[0003] The purpose of the embodiments of the present invention is to provide a resistance detection device for connection confirmation CC terminal, a charger and an electric vehicle, so as to solve the problem of accurately detecting the resistance value of the resistance on the connection confirmation CC terminal due to electromagnetic interference and pollution in the prior art
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[0033] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.
[0034] The embodiment of the present invention aims at determining the resistance value of the resistor through the voltage at both ends of the resistor on the connection confirmation CC terminal to be detected in the prior art, the reference ground of the connection confirmation CC terminal is different from the reference ground of the detection unit due to the addition of a filter circuit, To solve the problem of inaccurate test results, provide a resistance detection device, a charger and an electric vehicle that are connected to confirm the CC terminal, realize the determination of the resistance value of the resistor according to the pulse width modulation signal, improve the anti-interference ability and the accuracy of the detection results sex.
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The invention provides a connection confirmation CC end resistance detection device, a charger and an electric vehicle, and relates to the electric system technical field; the connection confirmationCC end resistance detection device comprises the following parts: a detection unit connected with a to-be-detected connection confirmation CC end; a pwm signal generation circuit with the input end connected with the connection confirmation CC end and the output end connected with the detection unit; the pwm signal generation circuit is used for forming a pwm signal according to the output voltageof the connection confirmation CC end, and sending the pwm signal to the detection unit; the detection unit is used for determining the resistance of the resistor on the connection confirmation CC end according to the received pwm signal. The detection device can improve the connection confirmation CC end resistance detection device electromagnetic compatibility and anti-interference capability,thus improving the resistance detection result accuracy.
Description
technical field [0001] The invention belongs to the technical field of electrical systems, and in particular relates to a resistance detection device for confirming connection to a CC terminal, a charger and an electric vehicle. Background technique [0002] In the prior art, the resistance detection method of the resistance on the connection confirmation CC terminal is that the detection unit outputs a preset current signal to the resistance on the connection confirmation CC terminal, thereby generating a voltage on the connection confirmation CC terminal signal, and determine the resistance value of the resistor on the connection confirmation CC terminal according to the voltage signal. However, at present, the power supply of most electric vehicles is divided into power battery power supply (high voltage 200V) and battery power supply (low voltage 14V). All electrical components on the electric vehicle, including motor controller and DC-DC voltage converter, etc. The pow...
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IPC IPC(8): G01R27/14
CPCG01R27/14
Inventor 孟江涛
Owner BEIJING ELECTRIC VEHICLE