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Control method of power conversion circuit and apparatus thereof

A technology for converting circuits and powers, which is applied in the field of control methods and devices for power converting circuits, can solve the problem that a switch tube cannot be turned on at zero voltage, and achieves the effect of turning on at zero voltage.

Active Publication Date: 2017-03-08
VERTIV CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Embodiments of the present invention provide a control method and device for a power conversion circuit to solve the problem in the prior art that the switching tube on the high-frequency bridge arm cannot be turned on at zero voltage

Method used

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  • Control method of power conversion circuit and apparatus thereof
  • Control method of power conversion circuit and apparatus thereof
  • Control method of power conversion circuit and apparatus thereof

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Embodiment Construction

[0020] In order to provide a solution for realizing the zero-voltage turn-on of the high-frequency bridge arm switching tube in the power conversion circuit, the embodiment of the present invention provides a control method and device for the power conversion circuit. The preferred embodiment of the present invention will be described in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, not to limit the present invention. And in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0021] An embodiment of the present invention provides a control method for a power conversion circuit, such as image 3 As shown, the following steps may be included:

[0022] Step 301, for each input inductor in the power conversion circuit, detect the current of the input inductor;

[0...

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Abstract

The invention discloses a control method of a power conversion circuit and an apparatus thereof. By using the method and the apparatus of the invention, zero voltage opening of a high frequency bridge arm switch tube can be realized, circuit losses are reduced and circuit efficiency is increased. The control method comprises the following steps of for each input inductor in the power conversion circuit, detecting a current of the input inductor; when a current zero crossing point of the input inductor is detected, making a main switch tube on a high frequency bridge arm connected to the input inductor be in a conduction state for a first time length and making a follow-current switch tube on the high frequency bridge arm connected to the input inductor be in a disconnected state; and after the main switch tube is controlled to be in the conduction state for the first time length, making the main switch tube be in a disconnected state and making the follow-current switch tube be in a conduction state for a second time length.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a control method and device for a power conversion circuit. Background technique [0002] The power conversion circuit includes a PFC (Power Factor Correction, power factor correction) circuit, a UPS (Uninterrupted Power Supply, uninterrupted power supply) circuit, etc. Taking the PFC circuit as an example, the structure and existing control methods of the power conversion circuit are briefly described. [0003] High-efficiency PFC circuits in the prior art mainly include figure 1 shown in the single-way totem-pole PFC circuit and figure 2 The interleaved totem pole PFC circuit shown. figure 1 In the single-way totem pole PFC circuit shown, the switch tubes Qsr1 and Qsr2 form a power frequency bridge arm, which can also be composed of two diodes, and the switch tubes Q1 and Q2 form a high frequency bridge arm. The midpoint of the frequency bridge arm is connected to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/08
CPCY02B70/10
Inventor 吴屏李祥生
Owner VERTIV CORP
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