High frequency ballast for gaseous discharge lamps

Details High frequency ballast for gaseous discharge lamps High frequency ballast for gaseous discharge lamps

H - Electricity

05

B

315/37, 315/55

H05B 41/36 (2006.01) H05B 41/285 (2006.01)

Patent

CA 1327991

Abstract of the Invention An electronic frequency inverter circuit receives input electrical power at a lower frequency and energizes a load circuit including gaseous discharge lamps in a range of higher frequencies. First and second semiconductors are operated alternately by a logic circuit in current mode control such that the switches operate at the higher frequency range and the frequency of current in the load circuit varies as the magnitude of said source voltage varies. The load circuit has an impedance which varies with frequency such that the peak amplitude of the load current remains substantially constant despite variations in the magnitude of said source voltage to achieve a desirable crest factor for the lamp current.

532219

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