Vehicle-mounted bidirectional charger circuit of electric automobile

Abstract

The invention discloses a vehicle-mounted bidirectional charger circuit of an electric automobile. The vehicle-mounted bidirectional charger circuit of the electric automobile comprises a rectifier module, a DC / DC conversion module, and a control circuit, the rectifier module is connected with the DC / DC conversion module through a direct current bus, the working modes of the vehicle-mounted bidirectional charger circuit comprise a forward direction battery charging mode and a reverse direction alternating current output mode; under the forward direction battery charging mode, the rectifier module works as a full-bridge PWM rectifier circuit, and the DC / DC conversion module works as a full-bridge LLC rectifier circuit; under the reverse direction alternating output mode, the DC / DC conversion module works as a full-bridge LC rectifier circuit, and the rectifier module works as a full-bridge inverter circuit. According to the vehicle-mounted bidirectional charger circuit of the electric automobile, the vehicle-mounted bidirectional charger is low in cost and high in power density, and high power output with a small volume can be realized.

Description

[technical field] [0001] The invention relates to a vehicle-mounted charger, in particular to a vehicle-mounted bidirectional charger circuit for an electric vehicle. [Background technique] [0002] There are two mainstream topologies for the main circuit of the traditional on-board charger dedicated to high-power bidirectional electric vehicles. The first type uses a full-bridge rectifier circuit composed of four high-frequency MOSs in the rectification part, and the DC part uses a BOOST+BUCK+LLC topology. The topology circuit of this solution is complex and the cost is extremely high; the second type uses four A full-bridge rectifier circuit composed of a high-frequency MOS, and the DC part adopts a CLLC topology. The topology of this scheme adopts CLLC topology, which produces two gains, and the product stability is greatly reduced. At the same time, four high-frequency MOS transistors are used in the rectification part, and two sets of resonant capacitors and two sets o...

AI Technical Summary

Problems solved by technology

The first type uses a full-bridge rectifier circuit composed of four high-frequency MOSs in the rectification part, and the DC part uses a BOOST+BUCK+LLC topology. The topology circuit of this solution is complex and the cost is extremely high; the second type uses four A full-bridge rectifier circuit composed of high-frequency MOS, the DC part adopts CLLC topology

The topology of this scheme adopts CLLC topology, which produces two gains, and the product stability is greatly reduced. At the same time, four high-frequency MOS transistors are used in the rectification part, and two sets of resonant capacitors and two sets of resonant inductors are used in the DC part. The structure is complex. The cost is also relatively high

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