High frequency inverter with power-line-controlled frequency mod

Details High frequency inverter with power-line-controlled frequency mod High frequency inverter with power-line-controlled frequency mod

1993-04-23

1995-04-04

Pascal, Robert J.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch in the primary circuit of the supply...

315291, 315307, 315308, 315337R, 315244, H05B 3702

Patent

active

054040825

ABSTRACT:
An electronic high frequency supply, such as a lamp ballast, having a full-wave rectifier, a storage capacitor charged to a voltage greater than the peak of the rectifier output, and an isolating diode between the rectifier and the storage capacitor. An inverter is connected to the storage capacitor, and has a high frequency inductive load circuit connected between the inverter output and a junction between the isolating diode and the bridge rectifier. A capacitor, connected to the junction in parallel with a series circuit formed by the isolating diode and storage capacitor, forms a high frequency resonance circuit with the inductive load circuit. Current is drawn from the rectifier only as a series of pulses at the inverter frequency. To minimize variation in the high frequency load current, the inverter frequency is varied linearly with but oppositely to the instantaneous value of the rectifier output voltage.

REFERENCES:
patent: 3611021 (1971-10-01), Wallace
patent: 3997814 (1976-12-01), Toho
patent: 4277728 (1981-07-01), Stevens
patent: 4471269 (1984-09-01), Ganser et al.
patent: 4682082 (1987-07-01), MacAkill et al.
patent: 4782268 (1988-11-01), Fahnrich et al.
patent: 4862040 (1989-08-01), Nilssen
patent: 4873471 (1989-10-01), Dean et al.
patent: 5001400 (1991-03-01), Nilssen

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