A single-phase high-efficiency high-frequency isolated rectifier

A high-frequency isolation and rectifier technology, which is applied in high-efficiency power electronic conversion, instrumentation, DC power input conversion to DC power output, etc., can solve the problems of poor system reliability, complex structure, high cost, etc., and achieve improved efficiency and high power density , the effect of low total harmonic distortion

Active Publication Date: 2019-07-23
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This cascaded AC / DC converter has many components, complex structure, poor system reliability, and high cost

Method used

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  • A single-phase high-efficiency high-frequency isolated rectifier
  • A single-phase high-efficiency high-frequency isolated rectifier
  • A single-phase high-efficiency high-frequency isolated rectifier

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Embodiment Construction

[0042] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, and do not limit the protection scope of the present invention.

[0043] figure 1 A schematic structural diagram of an isolated rectifier based on a bridgeless PFC circuit and LLC resonance provided for the embodiment. Such as figure 1 As shown, the isolated rectifier provided in this embodiment is based on the full-bridge LLC resonant circuit, the totem pole PFC circuit is connected to the primary side of the full-bridge LLC resonant circuit, and the secondary side is a full-bridge rectifier circuit structure. The specific structure is as follows:

[0044]The primary side of a full-bridge LLC resonant circuit consists of:

[0045]...

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Abstract

The invention discloses a single-phase high-efficiency and high-frequency isolation type rectifier. The single-phase high-efficiency and high-frequency isolation type rectifier is characterized in that a front grade is a totem pole based bridgeless PFC (Power Factor Correction) circuit for converting alternating-current input voltage into direct-current voltage; a rear surface is an LLC resonant circuit; a primary side switching tube can realize zero-voltage soft switching-on and a secondary side switching tube can realize zero-current soft switching-off. Compared with a traditional circuit, aconverter provided by the invention has the advantages that the quantity of switching tubes can be reduced and a power device can realize soft switching-on and switching-off; the converter can be designed under relatively high switching-on and switching-off frequency, the power density of the converter can be improved and the efficiency of the converter is improved. The converter can be designedand operated under a continuous conduction mode and an input filter is not needed; input current of the converter can be changed very well along input voltage and a function of correcting a power factor is realized; the converter can realize stable direct-current voltage output through controlling output voltage.

Description

technical field [0001] The invention belongs to the field of power electronics and specifically designs a single-phase high-efficiency high-frequency isolation rectifier. Background technique [0002] AC / DC converters are widely used in electric vehicle chargers, LED drivers, communication power supplies and other occasions. While they better change people's lives, they also bring harmonic pollution problems. The power factor correction technology is used to make the input current and the grid voltage in phase, so as to increase the power factor to 1 and improve the quality of power supply. [0003] The traditional bridge PFC circuit has the advantages of stable use, simple structure, and simple control, but it can only be used in occasions where the efficiency is not high; with the development of power semiconductor devices, especially the application of wide bandgap semiconductor devices, bridgeless PFC circuits began to be widely used. The bridgeless PFC circuit reduces...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/217H02M3/335H02M1/42
CPCH02M1/4241H02M3/33569H02M7/217Y02B70/10
Inventor 邓焰李广地张盈曦王昆
Owner ZHEJIANG UNIV
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