US 2015/0102786 A1 · PFC CONTROL CIRCUIT, ACTIVE PFC CIRCUIT AND PFC CONTROL METHOD

Abstract

The present invention relates to a PFC control circuit, an active PFC circuit, and a PFC control method. According to an embodiment of the present invention, a PFC control circuit including: an inductor current sensing unit for sensing an inductor current of a PFC circuit; an output voltage feedback unit for outputting a feedback output signal; a sensing and feedback signal application unit for outputting a sensing voltage signal during switching duty on of the PFC circuit and adding the feedback output signal to the sensing voltage signal to output the added signal during switching duty off of the PFC circuit; and a PFC control unit for generating a comparison signal and generating a duty control signal from the comparison signal and a first reference signal to make variations due to an internal offset be removed or reduced is provided.

Claims20

Dependent claims

A PFC control circuit comprising:

an inductor current sensing unit for sensing an inductor current of a PFC circuit;
an output voltage feedback unit for outputting a feedback output signal by feeding back an output voltage sensed from an output of the PFC circuit;
a sensing and feedback signal application unit for outputting a sensing voltage signal sensed by the inductor current sensing unit during switching duty on of the PFC circuit and outputting a signal obtained by adding the feedback output signal to the sensing voltage signal during switching duty off of the PFC circuit;
and
a PFC control unit for generating a comparison signal from an output of the sensing and feedback signal application unit and generating and outputting a duty control signal for controlling a switching duty from the comparison signal and a first reference signal to make variations due to an internal offset be removed or reduced.

2 more elements

A PFC control method comprising:

an inductor current sensing step of sensing an inductor current of a PFC circuit;
an output voltage feedback step of outputting a feedback output signal by feeding back an output voltage sensed from an output of the PFC circuit;
a sensing and feedback signal application step of outputting a sensing voltage signal sensed in the inductor current sensing step during switching duty on of the PFC circuit and outputting a signal obtained by adding the feedback output signal to the sensing voltage signal during switching duty off of the PFC circuit;
and
a duty control step of generating a comparison signal from an output of the sensing and feedback signal application step and generating and outputting a duty control signal for controlling a switching duty from the comparison signal and a first reference signal to make variations due to an internal offset be removed or reduced.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

14/515,122Filed 15 Oct 2014

Priority

KR 10-2013-012344016 Oct 2013

Published

16 Apr 2015

Term ends

Not estimatedThe source records don’t support an estimate.

Classification6 codes

H02M 1/4225
Arrangements for improving power factor of AC input: using a non-isolated boost converter
H02M 1/4208
Circuits or arrangements for compensating for or adjusting power factor in converters or inverters: arrangements for improving power factor of AC…
H02M 1/0032
Details of control, feedback or regulation circuits: control circuits allowing low power mode operation, e.g. in standby mode
Y02B 70/10
Technologies for an efficient end-user side electric power management and consumption: technologies improving the efficiency by using…

Pfc control circuit, active pfc circuit and pfc control method

Life of this patent

Pfc control circuit, active pfc circuit and pfc control method

Life of this patent

Abstract

Claims20