Step-wise dimmer control circuit for a discharge lamp

Details Step-wise dimmer control circuit for a discharge lamp Step-wise dimmer control circuit for a discharge lamp

1982-10-25

1985-05-28

Moore, David K.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

315310, 315128, 315159, 315DIG4, H05B 3702, H05B 4138

Patent

active

045202958

ABSTRACT:
A dimming circuit for a discharge lamp (5) arranged in series with two electric coils (3, 4), one of which is by-passed by a semiconductor switching element (6).
The control circuit of the semiconductor switching element (6) includes a series arrangement of a resistor (15) and a capacitor (16) connecting a main electrode to the control electrode. The inductance of the by-passed coil (3) is chosen such that the semiconductor switching element (6) is made conductive on reignition of the lamp. The electric losses of the dimming arrangement are low.

REFERENCES:
patent: 3816794 (1974-06-01), Snyder
patent: 4144478 (1979-03-01), Nuver
patent: 4197485 (1980-04-01), Nuver
patent: 4286195 (1981-08-01), Swinea, Jr.
patent: 4395660 (1983-07-01), Waskiewicz

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