Fluorescent lamp high frequency operating circuit

Details Fluorescent lamp high frequency operating circuit Fluorescent lamp high frequency operating circuit

H - Electricity

05

B

315/38

H05B 41/36 (2006.01) H05B 41/295 (2006.01)

Patent

CA 1322573

ABSTRACT OF THE DISCLOSURE. To provide enhanced starting voltages for fluorescent lamps operating, for example, from 110 V power networks through a rectifier, and in which a high-frequency oscillatory circuit is used which includes a ring core transformer (TR1, TR2, TR3) operated under saturation conditions, and controlling switching transistors (T1, T2), which have emitter-resistors (R4, R5) connected thereto to stabilize the operation of the circuit and of the transistors, at least one diode (Fig. 4: D4, D5) is connected in parallel to at least one of the emitter resistors; for some circuits (Figs. 2-4) a diode, or two diodes (D6, D7, D8, D9) can form the emitter-resistors or resistors.

584641

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