Circuit configuration for a fixed-frequency blocking oscillator

Details Circuit configuration for a fixed-frequency blocking oscillator Circuit configuration for a fixed-frequency blocking oscillator

1990-10-01

1991-07-23

Stephan, Steven L.

Electric power conversion systems

Current conversion

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

363 97, H02M 3335

Patent

active

050348736

ABSTRACT:
A circuit configuration for a fixed frequency blocking oscillator converter switching power supply includes an electric switch. A transformer has a primary winding connected in series with the electric switch in the circuit of a voltage source outputting a direct voltage with a first algebraic sign, the switch being alternatingly switched on in a first operating phase and switched off in a second operating phase, and a secondary winding having a voltage from which a rectified output voltage is attained. An integratable trigger circuit for pulse-width-modulated switching of the switch has an oscillator emitting a voltage oscillating periodically between upper and lower peak values, and a pulse width modulator connected between the oscillator and the switch for switching the switch as a function of the periodically oscillating oscillator voltage. The periodically oscillating oscillator voltage varies at a speed being at least intermittently proportional to the direct voltage in a period segment in which its variation over time has the same algebraic sign as the direct voltage.

REFERENCES:
patent: 4564820 (1986-01-01), Peruth et al.
patent: 4593347 (1986-06-01), 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: 4924369 (1990-05-01), Varadi
patent: 4964028 (1990-10-01), Spataro
patent: 4975823 (1990-12-01), Rilly et al.

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