Two-way on-board charger insulation detection circuit and detection method thereof

Abstract

The invention discloses a two-way on-board charger insulation detection circuit and a detection method thereof. The detection circuit comprises an inverter circuit, a first Y capacitor (C1) connectedbetween an output firing line and a ground line of the inverter circuit, a second Y capacitor (C2) connected between an output zero line and the ground line of the inverter circuit, and further includes a firing line sampling circuit and a zero line sampling circuit correspondingly connected with the output firing line and the output zero line of the inverter circuit, and a controller connected with the firing line sampling circuit and the zero line sampling circuit. The firing line sampling circuit and the zero line sampling circuit respectively output sampling voltage. The controller determines a two-way on-board charger insulation state according to the two sampling voltage. When an on-board charger works in an inverter mode, values of ground insulation impedance of the output firing line L and the output zero line N are detected, and whether insulation failure exists between AC output of a pure inverter mode and a vehicle body is determined, so as to eliminate electric shock hazardof personnel. The circuit has advantages of simple and practical structure, easy implementation and low cost.

Description

technical field [0001] The invention relates to charging equipment, in particular to a bidirectional vehicle charger insulation detection circuit and a detection method thereof. Background technique [0002] The energy crisis and environmental pollution have become increasingly serious around the world, and the entire traditional automobile industry and the world's objective environment are facing severe challenges. With the strengthening of public awareness of environmental protection, advocating green travel and changing the travel structure has become the mainstream. Along with the development plan of the governments of developed countries to develop new energy vehicles, our government has also announced the corresponding development plan of new energy vehicles, and new energy vehicles have also been included in the seven emerging strategic industries. Among new energy vehicles, electric vehicles are currently the most mainstream. The on-board charger is a very importan...

AI Technical Summary

Problems solved by technology

Has the defect of cumbersome operation and cannot be monitored in real time

Images