LOAD DETECING METHOD AND POWER SUPPLY DEVICE WHERE THE METHOD IS APPLIED

摘要

A load detecting method relates to detecting connection or detachment between a power supply device and a load, and the load detecting method includes the following steps: determining whether a load detection operation is necessary or not, based on a detection voltage corresponding to an output voltage from the power supply device; when determining the load detection operation to be necessary, estimating a specific time point in a first period during which the output voltage of the power supply device decreases from a first level to a second level; and applying a test signal to the output voltage for a predetermined detection period with respect to the specific time point. The switching operation of a power switch of the power supply device does not occur in the first period.