High power factor, high-frequency operating circuit for a low-pr

Details High power factor, high-frequency operating circuit for a low-pr High power factor, high-frequency operating circuit for a low-pr

1995-02-15

1996-05-28

Pascal, Robert

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

315DIG7, 315307, 315244, 363 39, 363 47, H05B 3702, H05B 4129, H02M 112

Patent

active

055214673

ABSTRACT:
To insure high power factor for the operating circuit of a low-pressure discharge lamp, especially of miniature fluorescent lamps, a high-frequency active rectifier bridge (D1-D4) is provided which interrupts charging of a smoothing capacitor (C2), which smoothing capacitor supplies an inverter circuit (WR) in the switching rhythm of the inverter. A storage choke or inductance (L1), a negative feedback capacitor (CG) and an auxiliary capacitor (CS) are coupled to the high-frequency rectifier bridge (D1-D4) which, together with the inductance insure an approximately sinusoidal current being taken from a power network, with a power factor of 0.98 or higher. Preferably, the circuit includes voltage dividers (R8, R9, R11; R15, R16, R17) which are coupled to a voltage sensitive trigger circuit (DI, TH) to turn OFF alternate switching of transistors (T1, T2) of the inverter (WR) in case excess supply voltage or operating voltages of the lamp are sensed.

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The book, "Schaltnetzteile" (Network Components) by W. Hirschmann/ A. Hautein, Pub. by Siemens AG, 1990 Edition, p. 63.

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