Circuit configuration for a controlled blocking oscillator conve

Details Circuit configuration for a controlled blocking oscillator conve Circuit configuration for a controlled blocking oscillator conve

1990-10-01

1992-02-04

Stephan, Steven L.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 97, H02M 3335

Patent

active

050863827

ABSTRACT:
A circuit configuration for a controlled blocking oscillator converter switching power supply includes an electric switch having a duty cycle. A transformer has a primary winding connected in series with the electric switch in the loop of a direct voltage source for alternatingly turning on the switch in a first operating phase and turning off the switch in a second operating phase, and a secondary winding outputting an alternating voltage from which a direct voltage is obtained. An integratable trigger circuit is connected to the switch for pulse width modulated switching of the switch. The integratable trigger circuit has a controller for receiving an input voltage being at least approximately proportional to the alternating voltage, for comparing the input voltage with a set-point voltage, and for deriving a further voltage in the form of the voltage of a capacitor from the difference between the two voltages. The controller includes a controlling rectifier for charging the capacitor when the input voltage is less than the set-point voltage and discharging the capacitor when the input voltage is greater than the set-point voltage in the second operating phase. A pulse width modulator is connected between the controlling rectifier and the capacitor for determining the duty cycle of the switch as a function of the further voltage.

REFERENCES:
patent: 4564820 (1986-01-01), Peruth et al.
patent: 4597036 (1986-06-01), Paulik et al.
patent: 4648016 (1987-03-01), Peruth et al.
patent: 4740879 (1988-04-01), Peruth
patent: 4740880 (1988-04-01), Peruth
patent: 4763238 (1988-08-01), Maige
patent: 4975823 (1990-12-01), Rilly et al.
Publication by J. Wustehube, entitled "Schaltneztteile" (Switching Power Supplies), 1979, published by Expert-Verlag in Grafenau, Fed. Repub. of Germany.
Publication Siemens Product Brochure entitled "IC's fur die Unterhaltungselectronik" (IC's for Electronic Entertainment Systems), Aug. 1987, TDA 4605 on pp. 46-63.
IBM Technical Disclosure Bulletin 29 (1987) Apr., No. 11, Armonk, N.Y., U.S.A.

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