Patent ID: 6717390
Filing Date: 2004-04-06
Classification: H02M

Abstract:
A switching power supply comprising:a main circuit having a switching circuit for converting a DC input voltage to an AC voltage and an output circuit for rectifying the AC voltage to generate a DC output voltage; a control circuit for controlling the operation of the main circuit; and an abrupt load change detector circuit for detecting an abrupt change in the load current supplied from the main circuit, and abrupt load change detector circuit which includes: a first filter and a second filter for receiving the output voltage, a time constant of the first filter being different from that of the second filters; and detection signal generating means for generating an abrupt load change detection signal based on the outputs of the first and second filters, the detection signal generating means which includes a comparator for receiving an output of the first filter at one input terminal and of the second filter at the other input terminal.