Single-input control circuit for programming electronic...

Details Single-input control circuit for programming electronic... Single-input control circuit for programming electronic...

2008-08-14

2011-11-22

Philogene, Haiss (Department: 2821)

Electric lamp and discharge devices: systems

Time-controlled

C315S2090SC, C315S362000, C315S307000, C315S291000, C331S111000, C331S129000, C361S093200, C361S091600

Reexamination Certificate

active

08063588

ABSTRACT:
A circuit uses a single control input to an oscillator of an electronic ballast to program the parameters of soft-start frequency, pre-heat frequency, ignition ramp time, and ballast run frequency. The output frequency of the oscillator is based on an electrical parameter at the control input node. A resistor-capacitor network may be used to program the soft-start ramp time and ignition ramp time. The resistive element of the restive-capacitance network may be used to program the pre-heat frequency. A switchable impedance may be used to program the ballast run frequency. A look-up table circuit may also be used in the alternative to implement a single control input for the oscillator of an electronic ballast.

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Cecilia Contenti, IRPLMB1E-25W 230VAC Small Size Ballast Using IR2520D, International Rectifier, Application Note AN-1062, Mar. 2, 2004.

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