An electric vehicle conductive charging pilot signal detection circuit and system

Abstract

The invention discloses a conductive charging guide signal detection circuit and system for an electric vehicle. It includes: a PWM signal isolation detection unit for isolating and detecting the first PWM signal, a cable capacity isolation detection unit for detecting the charging cable capacity, an interface connection isolation detection unit for detecting whether the vehicle interface is fully connected to the charging device, A processing unit that connects each unit and judges the readiness status of each unit and outputs a control signal, and a PWM isolation control unit that receives the control signal to control the peak voltage at the detection point of the vehicle interface to determine whether the vehicle is ready, and can be charged. Through the above method, the present invention can realize the isolated detection of the conductive charging pilot signal, effectively avoid interference, ensure the reliable operation of the charging system, and have a simple circuit structure and low price.

Description

technical field [0001] The invention relates to the field of electric vehicle charging control, in particular to a conductive charging guide signal detection circuit and system for electric vehicles. Background technique [0002] At present, the problem of environmental pollution is becoming more and more serious, and various new energy vehicles have emerged as the times require. As a new energy vehicle, electric vehicles have increasingly become the focus of attention. [0003] Before charging an electric vehicle, it is first necessary to confirm whether the vehicle interface of the electric vehicle is properly connected to the charging device. If the vehicle interface is not properly connected to the charging device but still charging, it will easily lead to waste of energy, and sometimes even cause danger. When electric vehicles are charging, they also need to monitor the charging process in real time, and when abnormal conditions occur, the power should be cut off imme...

AI Technical Summary

Problems solved by technology

The existing charging guide signal detection circuit can effectively ensure the smooth progress of the charging process, but because the existing charging control signal detection circuit does not use isolation detection, it is prone to interference, and sometimes even leads to false detection

Moreover, because the charging guide signal detection circuit in the prior art mostly uses devices such as operational amplifiers and linear optocouplers, the circuit structure is complicated and the cost is relatively high.

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