Control Method and Power Controller for Power Factor Correction
AssigneeLeadtrend Technology Corp.
InventorYu-Pin WANG
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Abstract
Disclosed is a control method suitable for a PFC power converter, which includes a power switch and an inductive device. A compensation signal is provided based on an output voltage. A triangular-wave signal is provided based on the compensation signal. An average-current signal representing an average current flowing through the inductive device is provided. The triangular wave signal and the average-current signal are added up to provide an integrated signal. The compensation signal is compared with the integrated signal to stop an ON time of the power switch. By comparing the triangular-wave signal with the compensation signal, the triangular-wave signal resets and the ON time starts.
Claims20
A control method in use of a power controller in a PFC power converter, wherein the PFC power converter comprises a power switch and an inductive device, the control method comprising;
- providing a compensation signal according to an output voltage of the PFC power converter;
- generating a triangular-wave signal in response to the compensation signal;
- providing an average current signal to present an average current flowing through the inductive device;
- adding up the average current signal and the triangular-wave signal to generate an integrated signal;
- and
- comparing the integrated signal with the compensation signal to end an ON time of the power switch.
A power controller in use of a PFC power converter with a power switch and an inductive device, wherein the PFC power converter providing an output power source with an output voltage, the power controller comprising:
- a compensation circuit comparing the output voltage with a target voltage to provide a compensation signal;
- a triangular-wave generator providing a triangular-wave signal based on the compensation signal;
- an averaging circuit providing an average current signal to represent an average current flowing through the inductive device;
- and
- a first comparator comparing the compensation signal with an integrated signal to end an ON time of the power switch, wherein the integrated signal is a summation of the average current signal and the triangular-wave signal.
Dependencies are inferred from the claim text.