Power factor correction in electronic ballasts

Details Power factor correction in electronic ballasts Power factor correction in electronic ballasts

1990-03-01

1991-03-19

Mis, David

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315172, 315200R, 315283, 315DIG5, H05B 4100

Patent

active

050014005

ABSTRACT:
In a power-line-operated electronic ballast for a gas discharge lamp, an inverter converts a DC supply voltage to a high frequency current-limited operating voltage for a fluorescent lamp. The DC voltage is obtained, at least in part, by forward inductive-discharge conversion of full-wave-rectified unfiltered power line voltage; which forward conversion is accomplished by high frequency switching of an energy-storing inductor; the switching being done by the very same inverter that provides the high frequency lamp operating voltage. As an overall result, power is drawn from the power line with a power factor higher than 98% and with a total harmonic distortion under 10%.

REFERENCES:
patent: 4553070 (1985-11-01), Sairanen et al.

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