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Power factor correction circuit and control device and method thereof

A power factor correction and circuit technology, which is applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., can solve reliability doubts, the use of third-generation semiconductor devices is not large, Si- MOS reverse recovery cannot reliably realize the continuous control mode and other problems, and achieve the effect of simple circuit

Active Publication Date: 2020-12-18
HANGZHOU ZHONGHEN ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The continuous control mode has high requirements on the characteristics of the transistor. The reverse recovery of Si-MOS cannot reliably realize the continuous control mode. Only third-generation semiconductor devices such as GAN and SIC can be used. However, the third-generation semiconductor devices are not large in size and cost Problems such as high quality and doubtful reliability cannot be used in batches
The critical control mode is to turn off the transistor when the inductor current is infinitely close to zero, and the current continues to flow through the body diode of the transistor, using the reverse recovery characteristics of the body diode of the transistor to realize soft switching, but due to the reverse flow through the body diode of the transistor Recovery is uncontrollable, making it difficult to control totem pole bridgeless PFC circuits operating in critical mode

Method used

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  • Power factor correction circuit and control device and method thereof
  • Power factor correction circuit and control device and method thereof
  • Power factor correction circuit and control device and method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0051] Embodiment 1 provides a power factor correction circuit 10, which can effectively control the power factor correction circuit 10 to work in a critical mode, which is stable and reliable. The power factor correction circuit 10 includes a boost circuit 100, a first rectification circuit 110, a first detection Circuit 120 , second detection circuit 130 , second rectification circuit 140 and filter circuit 160 .

[0052] One end of the boost circuit 100 is connected to one end of the AC power grid AC, and the other end is connected to the midpoint of the first rectification circuit 110 . The control terminal of the first rectifier circuit 110 is connected to the external controller 150 , one terminal is connected to the first terminal of the filter circuit 160 as the first node 1 , and the other terminal is connected to the second terminal of the filter circuit 160 as the second node 2 . A first terminal of the first detection circuit 120 is connected to the midpoint of the...

Embodiment 2

[0056] Embodiment 2 is an improvement on the basis of Embodiment 1, please refer to figure 2 shown. Turning on or off the first switching tube Q1, the second switching tube Q2, the third switching tube Q3 and the fourth switching tube Q4 can eliminate the inability of the reverse recovery of the body diodes of the first switching tube Q1 and the second switching tube Q2. Controllability, and then can control the power factor correction circuit 10 to work in the critical mode, can reduce the loss caused by reverse recovery, stable and reliable.

[0057] The boost circuit 100 is a boost inductor L1. The first rectifier circuit 110 includes a first switching transistor Q1 and a second switching transistor Q2. The first switching tube Q1 includes a first control terminal, a first source terminal and a first drain terminal, the first control terminal is connected to the external controller 150, the first drain terminal is connected to the first terminal of the filter circuit 160...

Embodiment 3

[0075] Embodiment 3 provides a control device for a power factor correction circuit 10, please refer to image 3 As shown, it includes an AC transmission network AC, a controller 150 and the power factor correction circuit 10 of Embodiment 2, and the controller 150 is respectively connected to the first rectification circuit 110, the second rectification circuit 140, the first detection circuit 120 and the second detection circuit 130, used to compare the first level or the second level with the preset level threshold to generate a control signal and output it to the first rectification circuit 110 and the second rectification circuit 110 when receiving the first level or the second level The circuit 140 is used to control the power factor correction circuit 10 to work in the critical mode, so that the entire loop operates in the critical mode, which is stable and reliable.

[0076] Preferably, the controller 150 is respectively connected to the cathode of the first Zener diod...

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PUM

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Abstract

The invention discloses a power factor correction circuit, and relates to the field of switching power supply power electronics, the circuit comprises a boost circuit, a first rectification circuit, afirst detection circuit, a second detection circuit, a second rectification circuit and a filter circuit, the boost circuit boosts the voltage output from an AC power transmission network to obtain afirst AC voltage; the first rectification circuit and the second rectification circuit convert the first alternating-current voltage into pulsating direct-current voltage and control the power factorcorrection circuit to work in a critical mode when receiving a control signal generated by an external controller according to the first level or the second level; and the first detection circuit andthe second detection circuit respectively obtain a first level and a second level according to the pulsating DC voltage and output the levels to an external controller. The circuit is simple in structure, stable and reliable, and can effectively control the power factor correction circuit to work in a critical mode. The invention further discloses a control device and method of the power factor correction circuit.

Description

technical field [0001] The invention relates to the field of switching power supply power electronics, in particular to a power factor correction circuit, a control device and a method. Background technique [0002] For the current ultra-efficient primary modules, the front stage often uses a totem pole bridgeless PFC (Power FactorCorrection, that is, power factor correction) circuit to shape the input AC current, so that the input current is an approximate sine wave with the same phase as the input voltage to achieve input Possibility of power close to 1. The traditional totem pole bridgeless PFC circuit such as figure 1 As shown, the critical control mode or continuous control mode is usually adopted. The continuous control mode has high requirements on the characteristics of the transistor. The reverse recovery of Si-MOS cannot reliably realize the continuous control mode. Only third-generation semiconductor devices such as GAN and SIC can be used. However, the third-ge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/42H02M7/217H02M1/088H02M1/08H02M1/00
CPCH02M1/4225H02M7/217H02M1/088H02M1/083H02M1/0058Y02B70/10
Inventor 韦康杨圣别程志杰刘宏森
Owner HANGZHOU ZHONGHEN ELECTRIC CO LTD