Switching power supply apparatus
AssigneeFuji Electric Device Technology Co., Ltd.
InventorMasanari Fujii
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Abstract
A switching power supply apparatus employing a voltage obtained by rectifying an output from an AC power supply, as an input thereof includes a switching control circuit. The switching control circuit conducts a PFM control having a fixed ON-period of a switching device when a load is judged to be light based on a load signal indicating the load, and a PWM control when the load is judged not to be light. The switching control circuit changes the ON-period based on whether the AC power supply is a high voltage system or a low voltage system.
Claims7
A switching power supply apparatus inputting a voltage obtained by rectifying an output from an AC power supply, as an input thereof, comprising:
- a switching control circuit for conducting a PFM control having a fixed ON-period of a switching device when a load is judged to be light based on a load signal indicating the load, and a PWM control when the load is judged not to be light,
- wherein the switching control circuit changes the ON-period based on whether the AC power supply is a high voltage system or a low voltage system.
Dependencies are inferred from the claim text.