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PFC (power factor correction) circuit

A circuit and control circuit technology, applied in the field of PFC, can solve the problem of low PF value, achieve the effect of eliminating the influence of PF value, solving the effect of low PF value, and weakening the influence of PF value

Active Publication Date: 2013-11-13
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a kind of PFC circuit, to solve the problem of low PF value in the prior art

Method used

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  • PFC (power factor correction) circuit
  • PFC (power factor correction) circuit
  • PFC (power factor correction) circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Such as figure 2 As shown, including: rectifier bridge 201, input capacitor C in , PFC converter 202, PFC control circuit 203 and harmonic compensation circuit 204; wherein, the input terminal of harmonic compensation circuit 204 is connected with the high voltage output terminal of rectifier bridge 201, and its output terminal is connected with the voltage sampling input terminal of PFC control circuit 203 connected, its ground terminal is grounded; and its corner frequency f c When it is 50Hz, the corresponding phase is -45°.

[0037] The specific working principle is:

[0038] When the corner frequency f of the harmonic compensation circuit 204c When V is 50Hz, the phase of the voltage at the output terminal of the harmonic compensation circuit 204 is higher than the DC input voltage v received at its input terminal g The phase lags 45°, that is, the AC input voltage v of the PFC circuit in The phase lag of 45°, since the output terminal of the harmonic compensa...

Embodiment 2

[0040] Such as image 3 As shown, including: rectifier bridge 201, input capacitor C in , PFC converter 202, PFC control circuit 203 and harmonic compensation circuit 204; wherein, the input terminal of harmonic compensation circuit 204 is connected with the high voltage output terminal of rectifier bridge 201, and its output terminal is connected with the voltage sampling input terminal of PFC control circuit 203 connected, its ground terminal is grounded; and its corner frequency f c When it is 50Hz, the corresponding phase is -45°.

[0041] The difference with the above-mentioned embodiment is:

[0042] The harmonic compensation circuit 204 includes: harmonic compensation resistors R connected in series c and harmonic compensation capacitor C c ; Among them, the harmonic compensation resistor R c with harmonic compensation capacitor C c The connection point of is used as the output end of the harmonic compensation circuit 204, and the harmonic compensation resistor R ...

Embodiment 3

[0047] Such as Figure 5 As shown, including: rectifier bridge 201, input capacitor C in , PFC converter 202, PFC control circuit 203 and harmonic compensation circuit 204; wherein, the input terminal of harmonic compensation circuit 204 is connected with the high voltage output terminal of rectifier bridge 201, and its output terminal is connected with the voltage sampling input terminal of PFC control circuit 203 connected, its ground terminal is grounded; and its corner frequency f c When it is 50Hz, the corresponding phase is -45°.

[0048] The difference with the above-mentioned embodiment is:

[0049] PFC control circuit 203 includes:

[0050] A voltage sampling circuit 2031, the input terminal of the voltage sampling circuit 2031 is the voltage sampling input terminal of the PFC control circuit 203;

[0051] A current sampling circuit 2032, the current sampling circuit 2032 is connected to the output end of the PFC converter 202;

[0052] Error signal amplification...

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Abstract

The invention discloses a PFC circuit. The PFC circuit is characterized in that a harmonic compensation circuit with a corresponding subzero 45-degree phase when the corner frequency is 50 Hz is added, so that the phase of voltage at the output end of the harmonic compensation circuit is lagged by 45 degrees compared with the phase of input voltage, then the phase of rectified input voltage received by a PFC control circuit is lagged by 45 degrees compared with the phase of the input voltage, and the phase displacement caused by a 45-degree component of the phase of leading input voltage overlaid in input power can be offset; and simultaneously, the PFC control circuit adopts closed loop control, so that 45-degree phase displacement generated by the harmonic compensation circuit is introduced, and the 90-degree phase displacement of input current and leading input voltage due to input capacitance further is reduced to a certain degree. The PFC circuit disclosed by the invention eliminates the influence of the PFC control circuit on a PF (power factor) value, reduces influence of the input capacitance on the PF value, and solves the problem of a low PF value in the prior art.

Description

technical field [0001] The present invention relates to the technical field of PFC (Power Factor Correction, power factor correction), in particular to a PFC circuit. Background technique [0002] Common PFC circuits such as figure 1 As shown, it includes a power stage circuit 101 and a PFC control circuit 102 . Wherein, the power stage circuit 101 includes: a rectifier bridge 1011, receiving an AC input voltage v in , and the AC input voltage v in rectified to DC input voltage v g ;Input capacitance C in , connected in parallel between the two output ends of the rectifier bridge 1011, to filter the output signal of the rectifier bridge 1011; the PFC converter 1012, and the input capacitor C in connected in parallel to generate the DC output voltage v required by the load o . The PFC control circuit 102 includes: a voltage sampling circuit 1021, the input terminal of which is connected to the high voltage output terminal of the rectifier bridge 1011, and the DC input ...

Claims

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Application Information

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IPC IPC(8): H02M1/42H02M1/00
CPCY02B70/126H02M1/4208Y02B70/10Y02P80/10H02M1/0025H02M7/04H02M1/4216
Inventor 韩云龙陈惠强
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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