EV (electric vehicle) conductive charge guide signal detection circuit and system

Abstract

The invention discloses an EV (electric vehicle) conductive charge guide signal detection circuit and system. The circuit comprises a PWM (pulse width modulation) signal isolation and detection unit, a cable capacity isolation and detection unit, an interface connection isolation and detection unit, a processing unit and a PWM isolation control unit; the PWM signal isolation and detection unit is used for isolating and detecting a first PWM signal; the cable capacity isolation and detection unit is used for detecting capacity of a charge cable; the interface connection isolation and detection unit is used for detecting whether or not a vehicle interface and a charge device are fully connected; the processing unit is connected with the units and used for judging preparation statuses of the units and outputting a control signal; the PSM isolation control unit which is rechargeable is used for receiving the control signal to control peak voltage of a detection point of the vehicle interface. In this way, the EV conductive charge guide signal detection circuit and system has the advantages that conductive charge guide signals can be isolated and detected, jamming is effectively avoided, operational reliability of the system is guaranteed, and the circuit is simple in structure and low in cost.

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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