Discharge lamp lighting system with overcurrent protection for a

Details Discharge lamp lighting system with overcurrent protection for a Discharge lamp lighting system with overcurrent protection for a

1999-02-18

2000-09-19

Philogene, Haissa

Electric lamp and discharge devices: systems

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

315307, 315291, 315247, 315224, 315209R, 315DIG7, G05F 100

Patent

active

06121731&

ABSTRACT:
A lighting system for a fluorescent lamp includes an inverter circuit to which is connected a load circuit including a resonant circuit of an inductor and a capacitor in serial connection, with a lamp connected in parallel with the capacitor. An inversely frequency dependent voltage is applied between the lamp electrodes according to a predefined resonance characteristic such that the resonance frequency is less than a discharge start frequency at which the lamp is to start glowing. For lighting up the lamp the frequency of the inverter output voltage is changed from a first frequency that is higher than the discharge start frequency to a second frequency that is less than the resonance frequency. If the lamp accidentally goes off, the current flowing through the load circuit will advance out of phase with the inverter output voltage, possibly resulting in the destruction of the inverter switch or switches due to overcurrent. This danger is precluded by constantly monitoring the phase of the load current and, in event the load current is found to be in phase advance, by making the inverter output frequency higher than the resonance frequency of the resonant circuit and thereby delaying the phase of the load current.

REFERENCES:
patent: 5003230 (1991-03-01), Wong et al.
patent: 5111118 (1992-05-01), Fellows et al.
patent: 5798616 (1998-08-01), Takehara et al.
patent: 5804924 (1998-09-01), Ohnishi et al.

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