AC-DC rectifying device

Abstract

The invention provides an AC-DC rectifying device which comprises a PFC power factor correction module, a DC busbar capacitor and a DC-DC convertor module. The DC busbar capacitor is connected in parallel between at least two PFC power factor correction modules in parallel connection and at least two DC-DC convertor modules in parallel connection. In the invention, the PFC power factor correction module and the DC-DC convertor module are connected in parallel, the ripple current of on-off frequency level output by the power factor correction to the DC busbar capacitor is reduced, meanwhile, the ripple current output by the DC busbar capacitor to the DC-DC convertor module is reduced, the heat productivity of the DC busbar capacitor is reduced, the service life of the DC busbar capacitor is prolonged, and the service life of the whole DC-AC rectifying device is further prolonged.

Description

technical field [0001] The invention relates to the field of power transformation, in particular to an AC / DC rectifier. Background technique [0002] At present, AC and DC rectifiers are widely used in communication power supply, electric power operation power supply, industrial power supply and other fields. figure 1 A schematic diagram of an AC / DC conversion device in the prior art is shown, including an AC / DC converter module, a PFC power factor correction module, and a DC / DC converter module. The PFC power factor correction module in the prior art usually uses a Boost circuit, and the DC-DC converter module usually uses a half-bridge series resonant DC-DC converter or a full-bridge series resonant DC-DC converter. The half-bridge series resonant DC-DC converter draws current from the DC-link capacitors. Since the output current of the PFC power factor correction module is half-wave sinusoidal, and the input power of the half-bridge series resonant DC-DC converter can b...

AI Technical Summary

Problems solved by technology

However, electrolytic capacitors, especially the electrolytic capacitors with a withstand voltage level of 450V DC used in communication power supplies, occupy a large volume and high cost. The method of improving heat dissipation conditions is not very obvious when the electrolytic capacitors generate more heat.

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