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...

H - Electricity

02

M

H02M 5/293 (2006.01) H01K 1/62 (2006.01)

Patent

CA 2533237

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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