Totally-digitalized high-efficient multi-frequency quick charging power supply

Abstract

The invention provides a totally-digitalized high-efficient multi-frequency quick charging power supply, which comprises a high power factor high-efficient rectification module and a two-direction direct-current (DC) / DC conversion module, wherein the high power factor high-efficient rectification module comprises a filter circuit, an active power factor correction circuit, a network voltage detection circuit, an input current detection circuit, a power factor correction (PFC) digital control system, a power factor correction driving circuit and the like; and the two-direction DC / DC conversion module comprises a two-direction DC / DC converter, an output filter circuit, a two-direction DC / DC converter digital control system, a two-direction DC / DC converter driving circuit and the like. The active power factor correction circuit adopts a three-phase three-level three-switch topological form, and by adopting a digital control way, the power factor can be improved, and the current harmonic interference can be reduced; and the two-direction DC / DC converter adopts a four-phase structural bridge-type structure, every two phases are connected to an output through a coupling inductance, and moreover, since two identical phases are supplementary to each other, two different phases are shifted and a multi-frequency control way is adopted, the current ripple at the output side can be reduced, and the electromagnetic compatibility (EMC) characteristics and the efficiency of the overall machine can be improved.

Description

technical field [0001] The invention relates to a full-digital high-efficiency multi-frequency fast charging power supply in the fields of power electronics and electric transmission, battery charging technology, electric vehicles and other new energy fields, and belongs to the innovative technology of charging power supply. Background technique [0002] The existing power battery charging usually adopts the method of constant current charging and constant voltage charging; during constant current charging, because the ability of the battery to accept current decreases with the charging process, the current in the later stage of charging is mainly used for electrolysis of water, and gas is precipitated and cannot be effectively charged. The ground is converted into chemical energy, and the charging efficiency decreases; when charging at a constant voltage, due to the uncertain battery voltage, the charging current is too large, and problems such as battery pole bending are p...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to consider the above problems and provide a fully digital high-efficiency multi-frequency fast charging power supply that solves the problem of fast charging of large-capacity batteries

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