Single-stage AC-DC converter mode smooth switching and power factor correction control method

A technology for power factor correction and smooth switching, which can be used in the conversion of DC power input to DC power output, control/regulation systems, and output power conversion devices, which can solve problems such as low conversion efficiency.

Active Publication Date: 2020-07-31
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, most DAB converters work when the voltage conversion gain is less than 1, and the conversion efficiency is low

Method used

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  • Single-stage AC-DC converter mode smooth switching and power factor correction control method
  • Single-stage AC-DC converter mode smooth switching and power factor correction control method
  • Single-stage AC-DC converter mode smooth switching and power factor correction control method

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Embodiment

[0062] A control method for mode smooth switching and power factor correction of a unipolar AC-DC converter.

[0063] The converter, such as figure 1 shown. v ac is the grid AC voltage, the voltage value is 220V, and the frequency is 50Hz; i ac The AC current injected into the converter for the grid depends on the power required by the load; D 1 、D 2 、D 3 、D 4 Four diodes form an uncontrollable rectifier bridge to rectify the AC voltage of the power grid into steamed bread wave voltage v dc1 (variation range is 0V ~ 310V) and injected into the dual active bridge DC-DC converter; i dc1 is the output current of the uncontrolled rectifier bridge, C 1 It is a small film capacitor with a capacitance value of 2uF, and i dc1 The input current i of the dual active bridge DC-DC converter is obtained after absorbing the high-frequency current ripple in 1 ;Switch tube S 1 , S 2 , S 3 , S 4 constitutes the full bridge of the input side, S 5 , S 6 , S 7 , S 8Constitutes a...

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Abstract

The invention discloses a single-stage AC-DC converter mode smooth switching and power factor correction control method, and belongs to the technical field of high-frequency switching power supply directions in power electronics. According to the method, a dual-active-bridge DC-DC converter is controlled by using four modes which can be smoothly switched; the control variables of each mode comprise the duty ratio d1 of the primary side, the duty ratio d2 of the secondary side and the phase shift angle between the primary side and the secondary side, and the control variables can be obtained through the critical ZVS condition of each mode; and mode switching does not need to be judged according to a load power value. According to the invention, by taking the effective value of the leakage inductance current of a transformer as an optimization target, the transformation ratio of the transformer is optimized to improve the conversion efficiency of the converter; and by taking the leakageinductance current of the transformer as an optimization target, the transformation ratio of the transformer is optimized, so that the voltage conversion gain of the DAB converter is no longer smallerthan 1 all the time.

Description

technical field [0001] The invention relates to a mode smooth switching and power factor correction control method of a unipolar high-frequency isolated AC-DC converter, which belongs to the technical field of high-frequency switching power supply direction in power electronics. Background technique [0002] With the development of power electronics technology, the application fields of high-frequency isolation and high-efficiency AC-DC converters are becoming more and more extensive, especially in electric vehicles, data centers, power electronic transformers including energy storage units, micro-grids, etc. A power supply system occasion. Since these systems are directly connected to the AC power grid through the rectifier bridge, the converter is required to perform power factor correction. Considering the safety on the user side, electrical isolation is required. Since the rectified bridge outputs steamed bun wave voltage, the post-stage converter is required to be abl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/42H02M3/335
CPCH02M1/4233H02M1/4258H02M3/33576Y02B70/10
Inventor 沙德尚张健坤马培松
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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