Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Reexamination Certificate
2007-10-09
2007-10-09
Vu, David H. (Department: 2821)
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
C315S219000, C315S224000
Reexamination Certificate
active
11402883
ABSTRACT:
An electronic ballast for a lamp having a bridge circuit, includes at least one first switch and a second switch, a center point of the bridge circuit between the first and second switch, the center point coupled on one side to a reference potential via the series circuit including a first capacitor and a diode and on the other side to a first connection for the lamp via an inductance; a control unit for driving the first and second switches. The control unit has a supply connection coupled to the connection point between the first capacitor and the diode, the voltage across the supply connection being limited in terms of its amplitude, and having a measurement signal input for feeding a measurement signal to the control unit; the measurement signal input being coupled to the connection point between the first capacitor and the diode.
REFERENCES:
patent: 6670779 (2003-12-01), Shen
patent: 6710552 (2004-03-01), Schmitt
Heckmann Markus
Pollischansky Thomas
Bessone Carlo S.
Patent-Treuhand-Gesellschaft fūr Elektrische Glühlamp
Vu David H.
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