Patent ID: 6417654
Filing Date: 2002-07-09
Classification: G05F,H02M

Abstract:
A switching power supply comprising:a switching element; a choke coil; a comparator-detector; first, second, third and fourth resistors; and a capacitor; wherein first and second voltages are detected from both ends of said choke coil to which the pulse voltage from said switching element is applied, said first and second voltages are compared with each other by said comparator-detector, and the operation of said switching element is controlled according to the output of said comparator-detector to implement overcurrent protection; said first voltage detected from one end of said choke coil is partially divided by first and second resistors and inputted to one input end of said comparator-detector; and said second voltage detected from the other end of said choke coil is integrated by said third and fourth resistors and said capacitor and inputted to the other input end of said comparator-detector.