Drive circuit for capacitive electroluminescent panels

Details Drive circuit for capacitive electroluminescent panels Drive circuit for capacitive electroluminescent panels

1984-02-08

1985-07-02

Dixon, Harold

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

315205, 315226, 362 29, 368 67, H05B 3700

Patent

active

045270961

ABSTRACT:
A drive circuit is disclosed which includes a converter that provides current pulses that charge a capacitive electroluminescent lamp to produce light and a switching circuit that switches a predetermined number of successive current pulses at high frequency for progressively charging the electroluminescent lamp. The switching circuit also reverses the polarity of the electroluminescent lamp at low frequency when the electroluminescent lamp discharges at the end of a predetermined number of successive current pulses and before the electroluminescent lamp charges again by current pulses produced by the converter. The switching circuit is connected to and is responsive to signals provided by the timepiece frequency divider circuit and the converter is connected to the timepiece battery for stepping up the battery voltage to provide for the charging current pulses. The EL lamp is used as its own storage capacitor and receives substantially all of the energy provided by the converter.

REFERENCES:
patent: 4170747 (1979-10-01), Holmes
patent: 4210848 (1980-07-01), Suzuki et al.
patent: 4277728 (1981-07-01), Stevens
patent: 4412155 (1983-10-01), Isaka et al.
patent: 4443741 (1984-04-01), Tanaka et al.

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