Isolated bidirectional charger control method and control circuit

A control circuit, isolated technology, applied in battery circuit devices, circuit devices, AC network circuits, etc., can solve the problems of difficult to achieve regulation, inability to achieve boost function, insufficient voltage gain, etc.
CN108988451AInactive Publication Date: 2018-12-11NANJING UNIV OF AERONAUTICS & ASTRONAUTICS WUXI RES INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS WUXI RES INST
Publication Date
2018-12-11
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a control method and a control circuit of an isolated bidirectional charger, belonging to the technical field of power electronic converters. The bi-directional charger controlcircuit adopted by the method comprises a bi-directional AC / DC converter, an isolated DC / DC converter and a control unit. The power grid is connected to the battery pack through bi-directional AC / DCconverter, isolated DC / DC converter, isolated DC / DC converter using LLC converter, control unit including sampling circuit, DSP and optocoupler isolated driving circuit. The control method realizes the high efficiency of bi-directional operation and forward and backward operation of the vehicle-mounted charger, and has the advantages of high power density, high reliability, few devices and high efficiency.
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Description

Technical field

[0001] The invention discloses an isolated bidirectional charger control method and belongs to the technical field of power electronic converters. Background technique

[0002] Electric vehicles are an important breakthrough in solving the energy crisis in today's society. Global electric vehicle sales exceeded 1.2 million in 2017, and the charging efficiency of electric vehicles has received widespread attention. The two-stage vehicle charger topology is the most commonly used solution in the industry. The front stage is BoostPFC with a power frequency diode rectifier bridge. It uses the Boost boost principle to rectify the AC input voltage and uniformly increase it to about 400V, which is suitable for wide AC voltages. Input occasion (85-275V, 45-70Hz). The rear stage is a full-bridge LLC resonant converter, which can achieve soft switching within the full load range and achieve extremely high charging efficiency. Moreover, the inductor in the LLC convert...

Claims

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