Circuit arrangement for increasing the luminous flux in fluoresc

Details Circuit arrangement for increasing the luminous flux in fluoresc Circuit arrangement for increasing the luminous flux in fluoresc

1977-02-07

1978-10-24

Smith, Alfred E.

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

Plural cathodes or heaters in the load device

315101, 315205, 315DIG5, H05B 4129

Patent

active

041223756

ABSTRACT:
A circuit for the operation of fluorescent lamps which allows the current through the lamps to be raised above the manufacturer recommended limit without adversely effecting the lamps. Two oppositely poled diodes are connected to the two contact pins at each end of the lamps, and an AC voltage is applied thereto. The arrangement results in current through two properly poled diodes during one half cycle of the applied voltage, and through the two oppositely poled diodes during the second half cycle of the voltage. As a result of this alternate loading, the thermal stress in the lamp electrodes is substantially lowered, and the current through the lamp may be raised above the recommended limit. The AC voltage is preferably at a high frequency, for example twenty kilohertz, which results in illumination from the lamps originating along the glass walls due to the skin effect, and increases the illumination efficiency of the lamps. A particular design for a transformer is also disclosed wherein the primary windings are adapted to be coupled to a transistorized direct current converter and the secondary windings are adapted to be coupled to the fluorescent lamp.

REFERENCES:
patent: 4008414 (1977-02-01), Agnew

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