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

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

2006-05-23

2006-05-23

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

C315S2090SC, C315S2090SC, C315S194000, C323S320000, C323S325000, C323S300000

Reexamination Certificate

active

07049758

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 or duty cycle 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 a rate and/or duration of the signals from the time-based signal source in successive cycles of the load voltage to provide the soft start. The power controller may be in a voltage conversion circuit that converts a line voltage at a lamp terminal to the RMS load voltage usable by a light emitting element of the lamp.

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