Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1979-06-29
1981-09-15
La Roche, Eugene R.
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315208, 315308, 315DIG7, H05B 4136
Patent
active
042899931
ABSTRACT:
A circuit for supplying controlled direct current power to an electric discharge vapor lamp during ignition, warm-up and normal operation. A bridge rectifier and a capacitor voltage doubler convert standard alternating current line voltage into a direct current voltage of adequate magnitude to operate the lamp. The lamp is connected in series with a semiconductor control circuit across the DC supply. The semiconductor control circuit operates as a resistive ballast whose effective resistance decreases as vapor pressure within the lamp increases during warm-up, thereby limiting lamp current to a safe value immediately after ignition while reducing the amount of power dissipated in the ballast circuit during normal operation for improved efficiency. In a second embodiment, the conductivity of the resistive ballast circuit is controlled in response to variations in both lamp voltage and lamp current to control the amount of power delivered to the lamp. In a third embodiment, controlled rectifiers in the bridge maintain a constant voltage drop across the semiconductor ballast circuit and a self-oscillating source of firing pulses is employed to start the lamp.
REFERENCES:
patent: 3486070 (1969-12-01), Engel
patent: 3767970 (1973-10-01), Collins
patent: 3801867 (1974-04-01), West et al.
patent: 3999100 (1976-12-01), Dendy et al.
Elliott William J.
Harper Clarence E.
La Roche Eugene R.
Quietlite International Ltd.
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