Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Patent
1989-08-02
1990-09-25
Mis, David
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
315205, 315226, 315291, H05B 4129
Patent
active
049595911
ABSTRACT:
To ensure synchronous operation of push-pull connected oscillator transistors (T1, T2), receiving rectified power via a rectifier (GL) from a power network (U), in which the circuit includes an elevated voltage maintenance or step-up converter circuit having a choke (L2), a switching transistor (T3) and a diode - capacitor circuit (D5, C2), the switching transistor (T3) is controlled from the same source of control voltage as the push-pull connected oscillator transistors (T1, T2), for example by coupling the base of the switching transistor (T3) to receive control energy from a feedback coil (RK3) of a feedback transformer (RK1, RK2, RK3) also supplying feedback energy to the push-pull oscillator transistors (T1, T2). The switching transistor (T3) can be controlled by a controllable resistor (R2) connected to its base, which may receive a control voltage through a control amplifier (FIG. 3: RV) representative of voltage levels in the circuit. A further transistor (T4) can be connected serially between the rectifier (GL) and the choke (L2) of the step-up converter circuit which improves approximation of sinusoidal wave form and voltage level maintenance of the circuit, the further transistor (T4) being likewise controlled from the same energy source as the switching transistor (T3).
REFERENCES:
patent: 4782268 (1988-11-01), Fahnrich et al.
"Neue Leuchten und Vorschaltgerate mit reduzierter Aschlussleistung", New mps and Auxiliary Circuits with Reduced Power Take-Up), Siemens Energietechnik (Energy Technology) 2, 1981 Issue 5.
W. Hirschmann: "Eletronikschaltungen" (Electronic Circuits) Siemens AG, 1982, p. 148.
O. Mackek: "Schaltnetzteile-Motorsteuerungen" (Circuit Components--Motor Controls), Huthig, publishers, 1982.
Siemens: Switched-Mode Power Supplies (SMPS) Technology and Components--Aug. 1985.
Mis David
PATENT TREUHAND GESELLSCHAFT fur elektrische Gluhlampen m.b.H.
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