Efficient bidirectional converter

Abstract

An efficient bidirectional converter disclosed by the present invention comprises an inverter circuit, a resonant circuit, a transformer and a rectification circuit, the inverter circuit is a half-bridge inverter circuit, and the resonant circuit comprises a first inductor, a second inductor, a first capacitor, a second capacitor and a selection switch. The two ends of the first capacitor are connected with one end of the first inductor and one end of the second capacitor respectively, the other end of the second capacitor and one end of the second inductor are connected with the inverter circuit, the other end of the second inductor and the other end of the first inductor are connected with a primary winding of the transformer, the other end of the second inductor is connected with the first capacitor through the selective switch, so that the primary winding is connected to one end, connected with the second capacitor, of the first capacitor in a first state and connected to one end, connected with the first inductor, of the first capacitor in a second state, and a secondary winding of the transformer is connected with the input side of the rectifying circuit, and the output side of the rectifying circuit and the inverter circuit are respectively used as a second external connection end and a first external connection end of the high-efficiency bidirectional converter.

Description

technical field [0001] The invention relates to the technical field of power conversion, and more particularly relates to a high-efficiency bidirectional converter. Background technique [0002] The bidirectional converter is a DC / DC converter that can adjust the bidirectional transmission of energy according to the needs. It is mainly used in energy storage systems, vehicle power systems, feedback charging and discharging systems, hybrid energy electric vehicles and other occasions. [0003] In the traditional LLC resonant bidirectional converter, the ZVS conduction of the switch tube on the primary side and the ZCS conduction of the diode on the rectification side can be realized regardless of forward and reverse operation, but its circuit characteristics are no longer when the energy flows in the reverse direction. It is LLC resonance characteristic and degenerates into LC resonance characteristic. The maximum voltage gain of LC resonance becomes 1, which greatly reduces ...

AI Technical Summary

Problems solved by technology

[0003] In the traditional LLC resonant bidirectional converter, the ZVS conduction of the switch tube on the primary side and the ZCS conduction of the diode on the rectification side can be realized regardless of forward and reverse operation, but its circuit characteristics are no longer when the energy flows in the reverse direction. It is LLC resonance characteristic and degenerates into LC resonance characteristic. The maximum voltage gain of LC resonance becomes 1, which greatly reduces the voltage gain during reverse operation and greatly narrows the output voltage range, so it is not suitable for working in a wide range of energy The state of two-way flow limits its application scenarios

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