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High-efficiency totem-pole bridgeless PFC rectifier control method

A control method and totem pole technology, applied in high-efficiency power electronic conversion, output power conversion devices, electrical components, etc., can solve problems such as complex control strategies, inability to achieve full-range ZVS, and insufficient efficiency

Active Publication Date: 2019-10-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it also has many disadvantages: it cannot achieve full range ZVS; it needs a zero current detection link; the control strategy is complicated
But the circuit still has a current detection link, so the efficiency is not high enough

Method used

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  • High-efficiency totem-pole bridgeless PFC rectifier control method

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Embodiment 1

[0092]A totem pole bridgeless PFC rectifier disclosed in this embodiment is composed of a main circuit and a control circuit. Such as figure 1 As shown, the main circuit is mainly composed of an input side and an output side, and the input side is composed of an input inductance (L in ) and switch (S 1 , S 2 , S 3 , S 4 ), the output side consists of an output capacitor (C o ) and load (R L )composition. The totem pole structure is composed of 4 switching tubes (S 1 , S 2 , S 3 , S 4 )consist of. The connection relationship is: input side input inductance L in The left end is connected to the right end of the AC input power supply, and the input inductance L in At the same time, the right end of the switch tube S 1 source and switch S 2 The drain is connected, and the left end of the AC input power supply is connected to the switch tube S 3 source and switch S 4 connected to the drain. Switch tube S 1 and S 3 The source is connected, and then connected to t...

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Abstract

The invention discloses a high-efficiency totem-pole bridgeless PFC rectifier control method, and belongs to the field of high-frequency switching power supplies in the field of power electronics. Thetotem-pole bridgeless PFC rectifier is mainly composed of a main circuit and a control circuit. According to the invention, a first duty ratio is calculated through a derived first duty ratio calculation formula, so that the power factor can be improved; a second duty ratio and extra conduction time are calculated through a derived second duty ratio calculation formula, so that full-range zero-voltage switching ZVS can be realized, and the power factor is further improved; a current detection link can be removed through the first duty ratio, second duty ratio and extra conduction time obtained through calculation, so that the efficiency is improved; by generating a variable-frequency triangular carrier, the circuit works in a critical inductive current CRM mode, and ripple waves of inductive current are reduced; and by improving the circuit topology and replacing diodes with MOSFETs, the circuit on-state loss and the circulation loss caused by the current are reduced. Thus, efficiencyand reliability of the rectifier can be improved.

Description

technical field [0001] The invention relates to a high-efficiency full-range ZVS variable carrier frequency PWM control method for controlling a totem-pole bridgeless power factor correction PFC rectifier, in particular to a totem-pole bridgeless PFC rectifier using MOSFETs instead of diodes and a method for rectifier The full-range ZVS variable carrier frequency PWM control method for control belongs to the field of high-frequency switching power supplies in the field of power electronics. Background technique [0002] In power electronics applications that need to convert alternating current into direct current, there is a wide input voltage range, and it is desirable to have as high a power factor as possible and as small an output voltage ripple as possible. If the power factor is too low, the life of the battery will be shortened, and the grid on the AC side will also be affected. High efficiency is also a very important requirement for rectifiers. Zero-voltage switch...

Claims

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Application Information

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IPC IPC(8): H02M1/42H02M1/14
CPCH02M1/14H02M1/4208H02M1/0058Y02B70/10
Inventor 许国徐健斌粟梅孙尧王辉韩华刘永露但汉兵熊文静柳张杰
Owner CENT SOUTH UNIV
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