Phase control ballast

Details Phase control ballast Phase control ballast

1983-10-20

1986-04-01

Chatmon, Saxfield

Electric lamp and discharge devices: systems

Regulation of the control current and/or potential applied...

Discharge control discharge device in the control circuit

315291, 315307, 315DIG7, 323243, 323303, 323300, G05F 100, H05B 3702, H05B 3904, H05B 4136

Patent

active

045800804

ABSTRACT:
A phase control ballast in which a reactor and a triac are connected in series with an hid discharge lamp across an ac voltage source. A supra-linear converter connected to a rectifier-filter provides a reference voltage which is a supra-linear function of the source voltage. A ramp generator provides a ramp voltage climbing at a constant rate. At the instant when the ramp voltage exceeds the level of the reference voltage, a comparator circuit provides a signal to the gate of the triac which turns it on. A triac state detector responds to the turning on of the triac in either polarity by dropping the ramp voltage to zero and holding it at zero until the triac turns itself off.

REFERENCES:
patent: 4237405 (1980-12-01), Kellis
patent: 4346331 (1982-08-01), Hoge
patent: 4352045 (1982-09-01), Widmayer
patent: 4356433 (1982-10-01), Linden
patent: 4379254 (1983-04-01), Hurban
patent: 4453123 (1984-06-01), Erkman
patent: 4503364 (1985-03-01), Engel

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