Light controller connected to piezoelectric transformer for cont

Details Light controller connected to piezoelectric transformer for cont Light controller connected to piezoelectric transformer for cont

1998-02-13

1999-12-07

Wong, Don

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315224, 315307, H05B 3702

Patent

active

059989378

ABSTRACT:
A piezoelectric transformer drives a cold cathode tube under the control of a light controller; when the cold cathode tube is radiating in a small luminous intensity range, the light controller changes the duty factor of a driving signal supplied to the piezoelectric transformer so as to adjust the cold cathode tube at a target luminous intensity, and prevents the cold cathode tube from undesirable luminous gradient; when the cold cathode tube is radiating in a large luminous intensity range, the light controller changes the frequency of the driving signal so as to adjust the cold cathode tube to a target luminous intensity, and prevents a power supply unit from undesirable frequent load variation.

REFERENCES:
patent: 5371439 (1994-12-01), Griffin
patent: 5486740 (1996-01-01), Yamashita et al.
patent: 5796213 (1998-08-01), Kawasaki
patent: 5854543 (1998-12-01), Satoh et al.

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