Arrangement for protecting low-voltage control circuitry from ex

Details Arrangement for protecting low-voltage control circuitry from ex Arrangement for protecting low-voltage control circuitry from ex

1999-01-06

2000-11-07

Leja, Ronald W.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

323905, 315352, 315DIG7, H02H 320

Patent

active

061445398

ABSTRACT:
An arrangement for protecting low-voltage control circuitry from externally applied high voltages comprises a voltage source (30) and a current-sourcing circuit (40). Current-sourcing circuit (40) provides current to an external controller (18) in a normal manner when an external source of high voltage is not applied to the output connections (42,44), protects itself (40) and the voltage source (30) from damage when an external source of high voltage is applied to the output connections (42,44), and provides current to the external controller (18) in a normal manner after the external source of high voltage is subsequently removed from the output connections (42,44). The arrangement may be employed as the dimming interface circuit (900) of an electronic dimming ballast (60) for gas discharge lamps to protect ballast circuitry from damage due to wiring errors during installation.

REFERENCES:
patent: 3921035 (1975-11-01), Holmes
patent: 5038081 (1991-08-01), Maiale, Jr. et al.
patent: 5374887 (1994-12-01), Drobnik
patent: 5457360 (1995-10-01), Notohamiprodjo et al.
ST Microelectronics Application Note, L6574 CFL/TL Ballast Driver Preheat and Dimming, Sep. 1998.

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