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

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

2006-10-03

2006-10-03

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

C315S2090SC, C315S2090SC, C315S224000, C323S320000, C323S325000

Reexamination Certificate

active

07116062

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 duty cycle of a pulse width modulation 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 duty cycle of the pulse width modulation circuit in plural steps to provide the soft start.

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