Method of soft-starting a switching power supply containing...

Details Method of soft-starting a switching power supply containing... Method of soft-starting a switching power supply containing...

H - Electricity

02

M

H02M 5/293 (2006.01) H01K 1/62 (2006.01) H05B 37/00 (2006.01) H05B 37/02 (2006.01)

Patent

CA 2533049

A method of operating a power controller that converts a line voltage to an RMS load voltage includes a soft start in which a conduction angle of a phase- control clipping circuit is gradually increased to a steady state value that defines the RMS load voltage. The controller has a circuit with a time-based signal source that triggers conduction independently of line voltage magnitude and a transistor switch whose gate receives signals from the time-based signal source to trigger the circuit. When starting the power controller, a microcontroller increases the conduction angle of the phase- control clipping circuit in plural steps to provide the soft start.

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