Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Induction-type discharge device load
Patent
1994-04-18
1995-08-29
Pascal, Robert J.
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Induction-type discharge device load
315258, 315264, 315267, H05B 3700
Patent
active
054463505
ABSTRACT:
An impedance matching circuit for a self-oscillating electrodeless fluorescent lamp ballast of the type having an inductor connected in series with the parallel combination of a capacitor and the lamp's drive coil includes an additional capacitor connected in series with the drive coil. The capacitance value chosen for the additional capacitor is dependent on: stresses on the parallel capacitor; matching the impedance of the ballast; and the impact of the capacitor on the loaded coil phase angle. The additional capacitor reduces the phase angle presented to the ballast, thereby lowering the sensitivity of the ballast to component and lamp variations. In addition, the overall impedance of the network is reduced, such that the required inductance of the series inductor is reduced; hence, the inductor can have fewer turns and lower conduction losses. The current in inductor for the required power level is lower, resulting in a further reduction in conduction losses as well as a reduction in core losses due to lower flux in the core. Still further, a reduction of stresses on the inductor results in a reduced operating temperature, and hence increased efficiency, reliability and ballast life.
REFERENCES:
patent: 4010400 (1977-03-01), Hollister
patent: 4017764 (1977-04-01), Anderson
patent: 4383203 (1983-05-01), Stanley
patent: 4415838 (1983-11-01), Houkes
patent: 4451765 (1984-05-01), Gray
patent: 4728867 (1988-05-01), Postma et al.
LR Nerone, A-H Qureshi, "Mathematical Modeling and Optimization of the Electrodeless, Low-Pressure Discharge System," Transactions of IEEE, PESC 1993, pp. 509-514.
El-Hamamsy Sayed-Amr
Ludwig Gerald W.
Nerone Louis R.
Wharmby David O.
Breedlove Jill M.
General Electric Company
Pascal Robert J.
Philogene Haissa
Snyder Marvin
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