Circuit for driving an electroluminescent lamp

Electric lamp and discharge devices: systems – Plural power supplies – Plural cathode and/or anode load device

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315209R, 315224, 315226, H05B 3700

Patent

active

056775997

ABSTRACT:
A circuit for repeatedly switching current through an inductor for driving an electroluminescent lamp at alternating voltage levels having both peak positive and peak negative polarities. This circuit includes a circuit path having two zener diodes in series connection with the lamp. These zener diodes each have an anode and a cathode, and a breakdown voltage, and may have either their anodes, or cathodes connected together. These zener diodes cause conduction along the circuit path in a first direction when a positive voltage driving the lamp exceeds the breakdown voltage of a first of the two zener diodes to provide a peak detection signal representing that the lamp has reached the peak positive polarity voltage level. Further, these zener diodes cause conduction along the circuit path in a direction opposite the first direction when a negative voltage driving the lamp exceeds the breakdown voltage of a second of the two zener diodes to provide a peak detection signal representing that the lamp has reached the peak negative polarity voltage level. The circuit has a polarity control circuit coupled to the circuit path. This control circuit switches the polarity of the voltage driving the lamp to a negative polarity in response to the positive peak detection signal and switches the polarity of the voltage to the lamp to a positive polarity in response to the negative peak detection signal.

REFERENCES:
patent: 4527096 (1985-07-01), Kindlmann
patent: 5172032 (1992-12-01), Alessio
patent: 5313141 (1994-05-01), Kimball

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