Circuit arrangement

Details Circuit arrangement Circuit arrangement

2007-03-27

2007-03-27

Wong, Don (Department: 2163)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

C315S307000, C250S50400H

Reexamination Certificate

active

10494749

ABSTRACT:
A driver for driving a gas discharge lamp includes an inductive ballast implemented as auto-transformer having a central tap, connected between one output terminal and a first input terminal, and a triac connected between a second output terminal and a second input terminal. The central tap of the ballast is connected, via a capacitor, to the second output terminal. A control unit has a sense input for sensing the phase of an input voltage at the first input terminal, and is adapted to trigger the triac at a predetermined phase (Φp) after a zero-crossing of the input voltage, the predetermined phase (Φp) being in the range of ΔΦ+10° to ΔΦ+15°, ΔΦ being the nominal phase lag of the lamp current with respect to the input voltage.

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