Patent ID: 6295212
Filing Date: 2001-09-25
Classification: H02M

Abstract:
A power supply system comprisingan a-c. power source,an off-line power supply including a capacitance for storing energy from said a-c. power source during first selected time intervals and converting at least a portion of the stored energy to a d-c. output during second selected time intervals,power switching means for disconnecting said off-line power supply from said a-c. power source during said second selected time intervals, at least said first selected time intervals being synchronized with said a-c. power source to ensure disconnection of said off-line power supply from said a-c. power source during said second selected time intervals during normal operation of said power supply system, andpower-regulation means having a transformer with a primary winding, means for supplying current to said primary winding from said capacitance during said second selected time intervals, and means for interrupting the flow of current to said primary winding at a preselected peak current level and substantially independently of temperature.