Drive and control circuits for gate capacitance latch with refre

Details Drive and control circuits for gate capacitance latch with refre Drive and control circuits for gate capacitance latch with refre

1985-10-28

1987-06-30

Dixon, Harold

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Plural periodic switches or multiple contact periodic switch

315205, 315208, 315224, 315DIG7, H05B 3702

Patent

active

046773460

ABSTRACT:
A switched AC ballast is operated synchronously with the AC line during normal running of a gas discharge lamp to limit EMI and is locked in a single phase during start-up (i.e. ignition, glow mode and warm-up) to protect the bridge switches from high voltage starting signals. Devices having a high impedance control input, such as FETs, are employed in the switching bridge thus allowing control of the upper devices in the bridge without a floating power supply. A control circuit insures proper operation of the bridge switches during all operating modes of the discharge lamp.

REFERENCES:
patent: 4170747 (1979-10-01), Holmes
patent: 4388563 (1981-05-01), Hyltin
patent: 4495446 (1985-01-01), Brown et al.

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