Electric lamp and discharge devices: systems – Discharge device and/or rectifier in the supply circuit – Plural discharge devices and/or rectifiers in the supply...
Patent
1989-03-02
1990-10-16
La Roche, Eugene R.
Electric lamp and discharge devices: systems
Discharge device and/or rectifier in the supply circuit
Plural discharge devices and/or rectifiers in the supply...
315219, 315313, 315320, 363 74, 363 95, 363100, 363132, H05B 3700, H05B 3900, H02M 324, H02M 7538
Patent
active
049637959
ABSTRACT:
An inverter-type fluorescent lamp ballast is powered from the power line by way of a common and either of two (or more) different power leads. When powering the ballast by way of the common and the first one of these two power leads, the power provided to the fluorescent lamp load is relatively high; when powering the ballast by way of the common and the second one of these two power leads, the power provided to the fluorescent lamp load is relatively low. The ballast itself is a self-oscillating half-bridge inverter 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 is 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 controlled as a function of the path of the input current from the power line; which path depends on the particular lead being used.
REFERENCES:
patent: 3909666 (1975-09-01), Tenen
patent: 4284925 (1981-08-01), Bessone et al.
patent: 4346332 (1982-08-01), Walden
patent: 4383204 (1983-05-01), Roberts
patent: 4471269 (1984-09-01), Ganser et al.
patent: 4811186 (1989-03-01), Vargo
La Roche Eugene R.
Shingleton Michael B.
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