High-voltage DC conversion circuit and vehicle-mounted charger

Abstract

The embodiment of the invention provides a high-voltage DC conversion circuit and a vehicle-mounted charger. The high-voltage DC conversion circuit comprises a DC input end, a DC output end, a controlunit and a plurality of resonant converters. The input ends of the resonant converters are connected to the DC input end in parallel, and the output ends of the resonant converters are connected between a positive output terminal and a negative output terminal of the DC output end in series. Each resonant converter comprises a DC-to-AC conversion subunit, a resonant network and an AC-to-DC conversion subunit. Under the control of the control unit, the phases of the output voltages of the DC-to-AC conversion subunits of the resonant converters are spaced by a preset angle. According to the embodiment of the invention, the primary windings of the resonant converters are connected in parallel and the secondary windings are connected in series, and the phases of the output voltages of the DC-to-AC conversion subunits of the resonant converters are spaced by the preset angle, so that the voltage ripple of the DC output end of the high-voltage conversion circuit can be significantly reduced.

Description

technical field [0001] Embodiments of the present invention relate to the field of power electronic equipment, and more specifically, relate to a high-voltage DC conversion circuit and a vehicle charger. Background technique [0002] Electric vehicles are powered by vehicle-mounted power supplies, driven by motors to drive wheels, and meet the requirements of road traffic and safety regulations. Since electric vehicles use batteries to provide electric energy for the motor, compared with internal combustion engine vehicles, electric vehicles will not produce exhaust pollution during driving, which is very beneficial to environmental protection and air cleanliness, and is almost "zero pollution"; and, electric vehicles The noise when the car is running is also smaller than that of the internal combustion engine, which can improve the comfort of the ride. [0003] In recent years, the performance of electric vehicles has been continuously developed. In order to achieve higher...

AI Technical Summary

Problems solved by technology

[0006] The embodiment of the present invention aims at the problem that the vehicle-mounted charger uses an LC filter at the high-voltage output end to reduce the voltage ripple, resulting in a larger volume, which affects the process and cost of the whole machine, and provides a high-voltage DC conversion circuit and a vehicle-mounted charger.

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