US 9,001,537 B2Granted

Power factor correction circuit

AssigneeDelta Electronics, Inc.

InventorsHong-Yuan Jin, Yan Chen, Hong-Jian Gan, Jian-Ping Ying

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Abstract

A power factor correction (PFC) circuit includes an AC power, a first bridge arm and a second bridge arm. The first bridge arm includes first and second switches connected in series with each other. A second terminal of the first switch is connected to a first terminal of the second switch, and coupled to a first end of the AC power via a first inductor. The second bridge arm includes third and fourth switches connected in series with each other. A second terminal of the third switch is connected to a first terminal of the fourth switch and a second end of the AC power. The third and fourth switches operate in ON/OFF states by use of a control signal having an operation frequency consistent with that of the AC power. The on-state resistance of the third and fourth switches is lower than that of the first or second switch.

Claims15

Dependent claims

A power factor correction (PFC) circuit, comprising:

an AC power having a first end and a second end;
a first bridge arm comprising a first switch and a second switch connected in series with each other and each having a first terminal and a second terminal, wherein the second terminal of the first switch is connected to the first terminal of the second switch, and is coupled to the first end of the AC power via a first inductor;
and
a second bridge arm connected in parallel with the first bridge arm, wherein the second bridge arm comprises a third switch and a fourth switch connected in series with each other and each having a first terminal and a second terminal, and the second terminal of the third switch is connected to the first terminal of the fourth switch and the second end of the AC power;
wherein the third switch and the fourth switch operate in ON/OFF states by use of a control signal having an operation frequency consistent with that of the AC power, and the on-state resistance of the third switch and the fourth switch is lower than the on-state resistance of the first switch or the second switch.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/523,615Filed 14 Jun 2012
Priority: CN 2012 1 009265329 Mar 2012
Published: US 2013/0257390 A13 Oct 2013
Granted: 7 Apr 2015
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H02M 1/4233
Arrangements for improving power factor of AC input: using a bridge converter comprising active switches
H02M 1/0048
Details of apparatus for conversion: circuits or arrangements for reducing losses
H02M 1/0085
Converters characterised by their input or output configuration: partially controlled bridges
H02M 7/2195
In a bridge configuration: the switches being synchronously commutated at the same frequency of the AC input voltage