Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Patent
1992-03-16
1998-05-26
Neyzari, Ali
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
315219, 315DIG4, H05B 4136
Patent
active
057571406
ABSTRACT:
A half-bridge inverter is powered from a constant DC voltage and loaded by way of an L-C circuit that has a natural resonance frequency equal to or lower than the inverter's operating frequency. A gas discharge lamp is disconnectably connected across the tank capacitor of the L-C circuit and, when indeed so connected, is provided with a current-limited high-frequency (30 kHz) voltage. The magnitude of the resulting lamp current decreases as the inverter's operating frequency is increased; which operating frequency is controlled by way of a negative feedback arrangement that causes the frequency to increase as a function of increasing magnitude of the current flowing through the tank capacitor. Thus, particularly with the lamp disconnected, the magnitude of the current flowing through the capacitor--and therefore also the magnitude of the voltage existing across it--will be regulated so as to be lower than it would be in the absence of the negative feedback.
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Bedfor et al, Principles of Inverter Circuit, John Wiley & Sons, Inc., 1964, pp. 287-300.
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