High frequency oscillator-inverter with improved regenerative po

Details High frequency oscillator-inverter with improved regenerative po High frequency oscillator-inverter with improved regenerative po

1990-07-06

1991-07-16

Mis, David

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

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

315223, 315DIG7, H05B 4114

Patent

active

050327674

ABSTRACT:
An improved power supply for one or more electric discharge lamps includes a high frequency oscillator-inverter circuit coupled to the output of a full-wave rectifier circuit via a transformer primary winding (25). The rectifier circuit is energized from a low frequency source of AC voltage. The oscillator-inverter circuit supplies high frequency oscillations to the lamp via a frequency-dependent ballast coupling circuit. A regenerative power supply is coupled to the transformer primary winding by means of a secondary winding (62) of the transformer thereby to charge a capacitor (49) operative as a switchable auxiliary supply voltage for the oscillator-inverter circuit. Improved start-up operation is achieved by winding the transformer (25, 62) so as to provide a polarity inversion for the supply of electric energy to the regenerative power supply.

REFERENCES:
patent: 4560908 (1985-12-01), Stupp et al.

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