Ballast integrated circuit (IC)

Details Ballast integrated circuit (IC) Ballast integrated circuit (IC)

2006-12-01

2008-01-29

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C315S226000, C315S300000, C315S302000, C315S308000

Reexamination Certificate

active

07323825

ABSTRACT:
A ballast integrated circuit (IC) for driving a first switching element and a second switching element includes: a variable gain amplifier (VGA) connected to a first input terminal connected to a resistor, for generating an output current signal according to a resistance value of the resistor and a gain control signal; a preheating/ignition controller connected to a second input terminal connected to a capacitor, for generating an output current signal and an output voltage signal acting as the gain control signal according to a voltage of the second input terminal; an active zero-voltage controller for generating a hard-switching current signal and an active zero-voltage switching current signal, such that it adjusts the voltage of the second input terminal according to switching states of the first switching element and the second switching element; an oscillator for generating an oscillation signal upon receiving the output current signal from the variable gain amplifier (VGA); and a dead-time controller for receiving the voltage signal of the second input terminal and an output signal of the oscillator, adjusting a dead time using the received signals, and at the same time generating driving signals of the first and second switching elements.

REFERENCES:
patent: 6002213 (1999-12-01), Wood
patent: 6008593 (1999-12-01), Ribarich
patent: 6211623 (2001-04-01), Wilhelm et al.
patent: 6525492 (2003-02-01), Ribarich
patent: 6879115 (2005-04-01), Ribarich
patent: 6891339 (2005-05-01), Ribarich et al.
patent: 6956336 (2005-10-01), Ribarich

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