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...

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 2533144

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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