Electronic dimmable gas tube power supply with overvoltage prote

Details Electronic dimmable gas tube power supply with overvoltage prote Electronic dimmable gas tube power supply with overvoltage prote

1995-04-06

1996-08-27

Pascal, Robert

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315219, 315276, 315DIG4, H05B 3700

Patent

active

055504370

ABSTRACT:
A ballast for driving a gas discharge tube light with overvoltage protection and dimming. A clamp winding coupled to the internal DC power source prevents overvoltage of the secondary terminals by permitting induced current flow in the clamp winding if the clamp winding voltage exceeds that of the internal DC power source. The transformer core includes a shunt leg which supports a dimmer control winding. When the dimmer control winding is open-circuited, magnetic flux is shunted away from the secondary winding, reducing the light intensity; when the dimmer control winding is short-circuited, currents induce in the dimmer control winding prevent substantial of magnetic flux density and increase the light intensity.

REFERENCES:
patent: 4682082 (1987-07-01), MacAskill et al.
patent: 5349273 (1994-09-01), Pacholok
patent: 5457360 (1995-10-01), Notohamiprodjo et al.

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