POWER SUPPLY APPARATUS WITH EXTENDING HOLD UP TIME FUNCTION

摘要

A power supply apparatus with extending a hold up time function includes a transformer, a winding switching unit and a detection unit. The transformer includes a primary side winding and a secondary side winding. A turn number of the secondary side winding and a turn number of the primary side winding have a relationship of a turn ratio. When the detection unit detects that an input voltage of the primary side winding is less than an input predetermined voltage, the winding switching unit is configured to increase the turn ratio, so that an output voltage of the secondary side winding is recovered to an output predetermined voltage.

主权项

1. A power supply apparatus with extending a hold up time function, the power supply apparatus comprising:
a transformer; a winding switching unit electrically connected to the transformer; and a detection unit electrically connected to the winding switching unit, wherein the transformer comprises: a primary side winding; and a secondary side winding coupled and induced to the primary side winding, wherein a turn number of the secondary side winding and a turn number of the primary side winding have a relationship of a turn ratio; when the detection unit detects that an input voltage of the primary side winding is less than an input predetermined voltage, the winding switching unit is configured to increase the turn ratio, so that an output voltage of the secondary side winding is recovered to an output predetermined voltage.