IC697BEM713 | GE FANUC | Car charger leakage MODULE

Description

IC697BEM713 | GE FANUC | Car charger leakage MODULE

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As shown in Figure 3, during the charging process using an AC charging station, the AC charging station and vehicle coupler are connected to the public power grid. If the insulation inside the IC697BEM713 station is damaged, power frequency AC leakage current may occur. In the electric vehicle section, the leakage current that may be generated mainly comes from the leakage of the on-board charger, which generally has two main topologies: AC/DC and DC/DC. The main circuit diagram of a common on-board charger is shown in the following figure

The AC/DC part IC697BEM713 single-phase input AC power is first filtered by EMI, and then rectified into a stable output DC voltage of 400V under the action of the Boost type APFC circuit, providing DC input for the subsequent stage. The DC/DC part adopts a phase-shifting full bridge LLC main circuit to convert the DC voltage of 400V into an acceptable voltage for the battery. When the insulation between the circuit board and the device casing is damaged, pulsating DC residual current may be generated in the rectification section, and DC residual current with very small ripple coefficient may be generated in the Boost type APFC circuit. Here, Bender’s diagram is used to illustrate in detail the generation and hazards of residual DC current.

It can be seen that DC leakage may occur in the DC/DC push-pull full bridge converter. In China, low-voltage distribution systems generally use TN power supply, and the metal shell of the equipment is connected to the working zero line. DC leakage will be feedback to the charging line through the vehicle body and PE line. IC697BEM713 will affect the current waveform of the entire system. Through simulation of equivalent circuits, it was found that the current waveform of the entire system will change, as shown in the following figure.

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