Inverter circuit protection

Details Inverter circuit protection Inverter circuit protection

1976-07-14

1978-06-20

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Automatic substitution of the power supply

315276, 307 66, H05B 3700

Patent

active

040964108

ABSTRACT:
An emergency lighting system includes a switching transistor inverter circuit coupled with a layer wound output transformer for starting and operating a fluorescent lamp from a battery upon failure of AC line voltage. An integrated circuit control circuit provides logic to control operation of the system. To protect the control circuit from displacement currents produced through capacitive coupling as a result of rapid excursions in potential in the system, a guard winding is provided sandwiched between windings of the layer wound transformer. The guard winding is connected at one end to ground and to the control circuit thereby affording transient protection to sensitive circuit elements.

REFERENCES:
patent: 3921005 (1975-11-01), Watrous

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