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...

2007-03-27

2007-03-27

Vu, Bao Q. (Department: 2838)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

C315S2090SC, C315S2090SC

Reexamination Certificate

active

11096642

ABSTRACT:
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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