Battery operated inverter circuit for capacitive loads such as e

Details Battery operated inverter circuit for capacitive loads such as e Battery operated inverter circuit for capacitive loads such as e

1995-06-13

1996-09-17

Pascal, Robert

Electric lamp and discharge devices: systems

Discharge device and/or rectifier in the supply circuit

Flashers

H05B 3700

Patent

active

055571751

ABSTRACT:
In a switching inverter where switches are controlled so as to provide current through an inductor which is connected in series with other switches across a battery so as to power a capacitive load, such as an electroluminescent lamp, with higher voltage than the battery voltage, the other switches, which may be SCRs, provide a path for current which charges and discharges the lamp to provide the higher voltage as an alternating voltage across the load. These other switches are switched on in synchronism with pulses of current which are produced in the inductor by circuits providing capacitances at the triggering terminals of the other switches (control electrodes or gates in the case of SCRs). These circuits are connected to the inductor so that transients or spikes, occurring when the current through the conductor is switched, enable triggering current flow with respect to the capacitances. This triggering current flow automatically triggers the other switching devices. Then, charging and discharging current paths to the load are established through these devices so as to enable the higher AC voltage to be developed across the load. The efficiency of the inverter may be increased by directing the discharge current from the load, in part, through the battery thereby recovering some of the battery energy during the discharge half cycle of the inverter. A resistor in the circuit for the triggering current provides a bias voltage which causes devices in the circuit which switches current through the inductor to pass a portion of the discharge current from the load to the battery.

REFERENCES:
patent: 4253097 (1981-02-01), Hochstrate
patent: 4527096 (1985-07-01), Kindlmann
patent: 4937647 (1990-06-01), Sutton
patent: 5027040 (1991-06-01), Ikeda et al.
patent: 5313141 (1994-05-01), Kimball
patent: 5323305 (1994-06-01), Ikeda et al.
patent: 5336978 (1994-08-01), Alessio
patent: 5347198 (1994-09-01), Kimball

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