Cold cathode fluorescent lamp driving apparatus using a piezoele

Details Cold cathode fluorescent lamp driving apparatus using a piezoele Cold cathode fluorescent lamp driving apparatus using a piezoele

1996-08-15

2000-02-22

Shingleton, Michael B

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

315276, 315307, 315DIG5, 315DIG7, H05B 3702

Patent

active

06028398&

ABSTRACT:
An AC driving signal of a frequency in the vicinity of the resonance frequency of a piezoelectric transformer is generated by a variable oscillation circuit and the waveform of the output signal of the variable oscillation circuit is shaped so as to be substantially sinusoidal by a waveform shaping circuit and the output of the waveform shaping circuit is subjected by a driving circuit to current amplification or voltage amplification so as to be amplified to a level sufficient for driving the piezoelectric transformer and the output of the driving circuit is subjected to current limitation, and then input to the piezoelectric transformer and the output signal of the transformer is applied to a cold cathode fluorescent lamp so that the cold cathode fluorescent lamp is lit and even if the impedance of the cold cathode fluorescent lamp decreases, the piezoelectric transformer cannot supply a large current.

REFERENCES:
patent: 5548189 (1996-08-01), Williams

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