Circuit configuration for a blocking oscillator converter switch

Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter

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363 97, 363 21, H02M 3335

Patent

active

050723537

ABSTRACT:
A circuit configuration for a blocking oscillator converter switching power supply includes a switch. A transformer has a primary winding in the circuit of a direct voltage source being connected in series with the switch, and a secondary winding to be connected to a load. The transformer is magnetized in a first operating phase in which the switch is switched on and current flows in the primary winding, and is demagnetized in a second operating phase in which the switch is switched off and current flows in the secondary winding. An integratable control circuit has a demagnetization monitor detecting a voltage at a transformer winding and preventing the switched-off switch for being switched on until the feedback voltage in the blocking phase has exceeded a predetermined threshold value, and a suppression circuit blocking the turn-on enablement for the switch during a predetermined time after the beginning of the blocking phase. The fadeout time is dependent on the voltage dropping at the load, on the condition that the fadeout time is longer than a predetermined period of time at load voltages below a critical threshold value, and the fadeout time is at most as long as the predetermined period of time at load voltages that are at least as high as the critical threshold value.

REFERENCES:
patent: 4564820 (1986-01-01), Peruth et al.
patent: 4864480 (1989-09-01), Melcher
patent: 4885673 (1989-12-01), Phillippe
patent: 4945463 (1990-07-01), Dangschat
patent: 4984145 (1991-01-01), Dangschat et al.
Publication Joachim Wustehube: "Schaltnetzteile" (Switching Power Supplies) Expert Verlag Grafenau, 1979.
Siemens Product Information "IC's fur die Unterhaltungs-Elektronic" Aug. 87, pp. 46 to 63.

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