Power control circuits and methods

摘要

Power control circuits and methods are disclosed, suitable for a power supplier. A power control circuit has a clock generator, a phase controller and a power limiter. The clock generator provides a clock signal, substantially determining switching cycles of a power supply. The phase controller outputs a burst signal based on a group reference signal and a burst initiation signal, and makes a burst period corresponding to a burst signal not less than a group reference period corresponding to the group reference signal. The burst signal is capable of switching the power supplier between a switching state and a non-switching state. The power limiter limits the power transferred by the power supply in every switching cycle, during a burst-up duration after the power supply is switched from the non-switching state to the switching state. The burst initiation signal correlates to an output voltage of the power supplier.

主权项

1. A power control circuit for controlling a power supply comprising:
a clock generator for providing a clock signal for substantially determining switching cycles of the power supply; a phase controller for generating a burst signal having a period not smaller than a period of a group reference signal according to phases of the group reference signal and phases of a burst initiation signal for switching the power supply to a non-switching state or a switching state; and a power limiter for limiting a power output of the power supply in every switching cycle within a burst up duration not smaller than the period of the group reference signal after the power supply is switched from the non-switching state to the switching state; wherein the burst initiation signal is generated according to the power output of the power supply.