Inverter circuit for lighting a cold cathode tube by the use of

Details Inverter circuit for lighting a cold cathode tube by the use of Inverter circuit for lighting a cold cathode tube by the use of

1996-12-26

1998-12-29

Kinkead, Arnold

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315291, 315277, 315279, 310316, H05B 4100, H05B 3702

Patent

active

058545433

ABSTRACT:
In an inverter circuit including a piezoelectric transformer (17) for supplying a voltage signal to a cold-cathode tube (50), a driver (12) for driving the piezoelectric transformer, a voltage-controlled oscillator (11) for producing an oscillation pulse voltage signal having an oscillation frequency controlled by a control voltage, a phase difference detection circuit (15) for detecting as a detected phase difference a phase difference between input and output voltage signals of the piezoelectric transformer, and a control circuit (16) for producing the control voltage so that the detected phase difference is coincident with a predetermined value, a current detection circuit (21) detects as a detected current value a current which flows through the cold-cathode tube. Supplied with the oscillation pulse voltage signal and the detected current value, a power control section (22) controls an electric power of the oscillation pulse voltage signal so that the detected current value has a preselected value. The power control section produces a power-controlled pulse voltage signal and supplies the power-controlled pulse voltage signal to the driver.

REFERENCES:
patent: 3743868 (1973-07-01), Kawada
patent: 5548189 (1996-08-01), Williams
EPO Search Report dated Mar. 12, 1997.

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