Switching power supply device
AssigneeSanken Electric Co., Ltd.
InventorToshirou Takeuchi
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Abstract
A switching power supply device has a boost power converter which converts a wide range of AC input voltages into a DC voltage larger than an amplitude of the AC input voltage to supply to a DC-DC converter. The switching power supply device includes a load detection circuit, an input voltage detection circuit, and a power conversion controller for the boost power converter. The power conversion controller corrects the determination reference value in accordance with the AC input voltage detected in the input voltage detection circuit. When a light load is detected based on a comparison between the corrected determination reference value and the detection value output from the load detection circuit, the controller disables the boost power converter.
Claims8
A switching power supply device comprising:
- a boost power converter configured to convert an AC input voltage into a DC voltage larger than an amplitude of the AC input voltage to supply to a DC-DC converter;
- a load detection circuit configured to detect a load condition of the switching power supply device;
- an input voltage detection circuit configured to detect a representative voltage of the AC input voltage;
- and
- a power conversion controller configured to control whether to enable or disable the boost power converter based on a comparison between the load condition and a first reference value, to adjust the first reference value according to the detected representative voltage of the AC input voltage, and to disable the boost power converter when the load condition is detected to be in a light load condition.
Dependencies are inferred from the claim text.