Control arrangement for electronic ballast

Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition

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Details

363 98, 363132, 315DIG4, 315DIG7, 315307, 315311, 315208, 315219, H05B 3702, H05B 3904, G05F 100, H02M 75387

Patent

active

050399195

ABSTRACT:
A self-oscillating half-bridge inverter is powered from a power-line-operated DC voltage source by way of an EMI filter. The inverter is loaded by way of a series-tuned high-Q LC circuit connected across its output. A pair of fluorescent lamps is series-connected across the tank capacitor of the LC circuit. The inverter has two bipolar transistors, each driven by an associated saturable current transformer that provides for a transistor ON-time dependent upon the magnitude of an associated bias voltage. One of the transistors has a control arrangement connected in circuit with its associated saturable transformer and operative to control the magnitude of its associated bias voltage. As the magnitude of this bias voltage is controlled, the magnitude of the voltage across the tank-capacitor, as well as of the current available therefrom, is correspondingly controlled. The magnitude of the bias voltage is automatically controlled as a function of: (a) the magnitude of the inverter's output current, (b) the magnitude of the voltage present across the tank-capacitor, (c) the magnitude of the current flowing through the lamps, (d) the setting of an adjustment means operative to adjust the amount of light output, (e) a temperature associated with the inverter, and (f) the magnitude of any ground-fault current that might be flowing.

REFERENCES:
patent: 4330736 (1982-05-01), Perper
patent: 4538095 (1985-08-01), Nilssen
patent: 4613934 (1986-09-01), Pacholok
patent: 4651271 (1987-03-01), Grace
patent: 4684850 (1987-08-01), Stevens
patent: 4719390 (1988-01-01), Sairanen
patent: 4727470 (1988-02-01), Nilssen
patent: 4819146 (1989-04-01), Nilssen

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