Power supply device

摘要

Disclosed herein is a power supply device. The power supply device includes a conversion unit converting an applied voltage into a predetermined level, a switching unit performing an opening operation or a closing operation to control a current flowing in the conversion unit, a sensing unit sensing an occurrence of overcurrent when a voltage applied to the switching unit is equal to or larger than a reference voltage set in advance, and a control unit performing a protection operation when the overcurrent is sensed again within a protection time set in advance after a predetermined time is delayed from the time at which the overcurrent is sensed, so that malfunction due to noise is prevented.

主权项

1. A power supply device, comprising:
a conversion unit converting an applied voltage into a predetermined level; a switching unit performing an opening operation or a closing operation to control a current flowing in the conversion unit; a sensing unit sensing an occurrence of overcurrent when a voltage applied to the switching unit is equal to or larger than a reference voltage set in advance; and a control unit performing a protection operation when the overcurrent is sensed again within a protection time set in advance after a predetermined time is delayed from the time at which the overcurrent is sensed, wherein the control unit comprises a time delay device that detects the time delayed from the time at which the overcurrent is sensed to thereby allow the control unit to determine whether the predetermined time is delayed, and determines whether the overcurrent is sensed again within the protection time, wherein the time delay device comprises a counter that counts the number of times for each fixed time from the time at which the overcurrent is sensed to thereby determine whether the predetermined time is delayed, wherein the counter sequentially outputs a plurality of count signals at a high level to a plurality of output terminals by counting the number of times for each fixed time from the time at which the overcurrent is sensed, and wherein the time delay device further comprises a first AND gate that performs an AND operation on the plurality of count signals output from the plurality of output terminals to output a first gate signal.