Lamp ballast drive circuit having a resistor in place of boot st

Details Lamp ballast drive circuit having a resistor in place of boot st Lamp ballast drive circuit having a resistor in place of boot st

1997-01-21

1998-10-27

Pascal, Robert J.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315224, 315291, 315307, 315DIG7, H05B 3702

Patent

active

058281843

ABSTRACT:
A lamp ballast drive circuit uses a resistor in place of a boot strap diode and drives a gas discharge illumination device. A pair of power devices are arranged in a half bridge configuration. A self oscillating driver circuit has output terminals connected to the power devices, respectively, a high side supply terminal, and a high side offset terminal that is coupled to the node between the power devices. A boot strap capacitor is coupled between the high side supply terminal and the high side offset terminal. A resistor is coupled between the voltage source and the high side supply terminal.

REFERENCES:
patent: 4415839 (1983-11-01), Lesea
patent: 5387847 (1995-02-01), Wood
patent: 5550436 (1996-08-01), Houk
patent: 5612597 (1997-03-01), Wood

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