Controller for power factor corrector and method of operation thereof
OwnerHengchun Maoinventor
Life of this patent
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Abstract
A controller for a power factor corrector (PFC), having a controllable switch and operable in a discontinuous conduction mode (DCM), and a method of controlling the controllable switch. In one embodiment, the controller includes: (1) a drive circuit adapted to drive the controllable switch and (2) a current mode control circuit adapted to sense a current of the PFC and develop a current control signal based thereon. The drive circuit reduces a duty cycle of the controllable switch based on the current control signal to reduce input current distortion in the PFC.
Claims25
For use with a power factor corrector (PFC) operable in a discontinuous conduction mode (DCM) and having a controllable switch, a controller, comprising:
- a current mode control circuit adapted to sense a current of said PFC and develop a current control signal based thereon;
- and
- a drive circuit adapted to drive said controllable switch, including:
- a voltage compensation circuit adapted to receive a signal representing an output voltage of said PFC and develop an intermediate signal therefrom, and
- a modulator, coupled to said voltage compensation circuit, adapted to develop a drive signal for said controllable switch based on said intermediate signal and a sum of said current control signal and a ramp signal, said drive circuit thereby capable of reducing a duty cycle of said controllable switch based thereon to reduce input current distortion in said PFC.
A method of controlling a controllable switch of a power factor corrector (PFC) operable in a discontinuous conduction mode (DCM), comprising:
- sensing a current of said PFC and developing a current control signal based thereon;
- developing an intermediate signal from a signal representing an output voltage of said PFC;
- developing a signal representing a sum of said current control signal and a ramp signal;
- and
- developing a drive signal for said controllable switch based on said intermediate signal and said signal representing said sum of said current control signal and said ramp signal, said drive signal reducing a duty cycle of said controllable switch based thereon to reduce input current distortion in said PFC.
A power factor corrector (PFC) operable in a discontinuous conduction mode (DCM), comprising:
- an electromagnetic interference (EMI) filter;
- a rectifier coupled to said EMI filter;
- a converter coupled to said rectifier and having a controllable switch;
- and
- a controller, including:
- a current mode control circuit that senses a current of said PFC and develops a current control signal based thereon, and
- a drive circuit that drives said controllable switch, including:
- a voltage compensation circuit that receives a signal representing an output voltage of said PFC and develops an intermediate signal therefrom, and
- a modulator, coupled to said voltage compensation circuit, that develops a drive signal for said controllable switch based on said intermediate signal and a sum of said current control signal and a ramp signal, said drive circuit thereby capable of reducing a duty cycle of said controllable switch based thereon to reduce input current distortion in said PFC.
Dependencies are inferred from the claim text.