Method of converting a line voltage to an RMS load voltage independently of variations in line voltage magnitude

摘要

A method of converting a line voltage to an RMS load voltage in a lamp includes performing phase-control clipping of a load voltage with a phase-control clipping circuit. Conduction in the phase-control clipping circuit is triggered independently of a line voltage magnitude during time periods spanning polarity changes of the load voltage that are separated by intervals when conduction is not triggered using a time-based pulse source so as to define a conduction angle of the phase-control clipping circuit.