Startup circuit for electronic ballasts for instant-start lamps

Details Startup circuit for electronic ballasts for instant-start lamps Startup circuit for electronic ballasts for instant-start lamps

1991-07-19

1993-01-05

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

315360, 363 49, H05B 3702

Patent

active

051774089

ABSTRACT:
A start-up delay circuit for an electronic ballast for "instant-start" type fluorescent lamps of the type having an electronic converter powered by an active electronic preregulator. The converter is an inductive-capacitive parallel-resonant push-pull circuit or other type of current-fed power-resonant circuit. The preregulator may be a boost-type. The start-up circuit may be either a resistor and zener diode or resistor, capacitor and diac network or programmable unijunction transistor circuit connected between the preregulator output and an oscillation-enabling input of the converter.

REFERENCES:
patent: 4104715 (1978-08-01), Lawson
patent: 5043635 (1991-08-01), Talbott
patent: 5068570 (1991-11-01), Oda
patent: 5068578 (1991-11-01), Wegener

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