Integrated circuit inverter control having a multi-function pin

Details Integrated circuit inverter control having a multi-function pin Integrated circuit inverter control having a multi-function pin

1996-05-03

1999-12-28

Vu, David H.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315224, 315291, H05B 3702

Patent

active

060085908

ABSTRACT:
An integrated circuit control device for driving a half bridge type of inverter. The IC control inverter powers a load including a lamp. The device includes at least one pin, which during the preheat cycle of the lamp is at a high logic level resulting in the coupling of an additional capacitor to an unloaded resonant tank circuit. The overall resonant frequency of the unloaded circuit is reduced making it less likely that a high voltage will be applied to the lamp during preheat. Once the lamp filaments have been preheated the pin is at a low logic level. The low logic level at the pin causes the additional capacitor to be decoupled from the tank circuit. The pin when at the low logic level also receives a signal representing the voltage condition across the lamp.

REFERENCES:
patent: 4952849 (1990-08-01), Fellows et al.
patent: 5610448 (1997-03-01), Dattilo
patent: 5615093 (1997-03-01), Nalbart

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