Title: Regulated supply units

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Claims: What is claimed is:

1. A regulated power supply system comprising in combination:

a. a four legged bridge, each leg of which includes at least one high frequency switched power transistor;

b. a source of DC voltage connected across one diagonal of said bridge;

c. a regulated output transformer connected across the other diagonal of said bridge;

d. clock controlled time base means;

e. first and second pairs of switching circuits for said power transistors connected to control respectively, pairs of said transistors in diagonally opposite legs of said bridge;

f. first and second circuits connected to said time base means for deriving therefrom first and second wave forms in relative phase opposition and connect said wave forms to the control inputs of said first and second pairs of switching circuits;

g. each of said switching circuits including a transformer having a center tapped secondary winding connected across the collector emitter of at least one said power transistor and the tap connected to the base of the same transistor;

h. a reference wave form generator;

i. an error signal forming circuit connected to compare the secondary voltage of said output transformer with a reference voltage;

j. a regulation signal forming circuit connected to receive said error signal and the output of said reference waveform generator and compare said signal; and

k. means applying the output of said regulating signal forming circuit to one only of the transistor switching control circuits of said first pair and to one of the transistor switching circuits of said second pair, one of said switching circuits connected respectively to control two legs of said bridge connected to the same side of said DC voltage source.

2. A regulated power supply system as defined by claim 1 in which said first and second circuits for deriving first and second waveforms in relative phase opposition comprise AND gate circuits operating on two identical frequency waveforms which are relatively shifted by one period of the clock of said time base means and are supplied by said time base means.

3. A regulated power supply system as defined by claim 2 in which said reference waveform generator has its input connected to one of said identical frequency waveforms.

4. A regulated power supply system as defined by claim 1 including a current overflow detector associated with the primary winding of said regulated voltage output transformer and an error signal limiting circuit connected to subtract the voltage output of said detector from the output of said error signal forming circuit.

5. A regulated power supply system as defined by claim 1 including a plurality of resistors, one connected between the emitter of each power transistor and one end of the secondary winding of said control circuit transformer.

6. A regulated power supply system as defined by claim 5 including a plurality of quick switching diodes, one connected respectively across the collector-emitter of each said transistor.

7. A regulated power supply system as defined by claim 5 including a plurality of quick switching diodes, one connected across the collector and that end of said resistor remote from said emitter.

8. A regulated power supply system as defined by claim 5 including a plurality of power transistors connected in parallel across the secondary winding of a control transformer in each leg of said bridge, a plurality of resistors, one connected between the emitter and diagonal pole of said bridge for each transistor.

9. A regulated power supply system as defined by claim 1 including a circuit connected to detect instability of the voltage supply for said switching circuit, and means controlled by said circuit for blocking the activation of said waveform forming circuits and said switching control circuits during each period of detection of voltage instability.

10. A regulated power supply system as defined by claim 1 including a regulation blocking circuit connected to de-activate said transistor switching control circuits and said reference waveform generator in each of its active periods.

11. A regulated power supply system comprising in combination:

a. a four leg bridge, the legs being high frequency switched power transistors;

b. a source of DC voltage connected across a diagonal of said bridge;

c. an output transformer connected across the other diagonal of said bridge;

d. means deriving a voltage departure error signal from said output transformer;

e. means establishing a first pair of oppositely phased waveforms controlled by said error signal;

f. means establishing a second pair of oppositely phased waveforms independent of said error signal;

g. means controlling two of the legs of said bridge connected to one pole of said source of DC voltage by the waveforms of said first establishing means; and

h. means controlling the other two legs of the bridge from said second oppositely phased waveforms, said first and second waveforms being respectively connected in opposite phase relation between diagonally opposite legs of said bridge.

Other info:

Inventors: Scholler, Jean-Pierre (Maisons Laffitte, FR)

Application Number: 514227
Filing Date: 1974-10-11
Publication_date: 1976-03-30
Assignee: Compagnie Internationale Pour L'Informatique (Louveciennes, FR)
Primary Class(es): 327/540 327/574, 327/588, 363/15
Other Classes:
US Patent Ref:

3260912	Jul, 1966	Gregory	307/254.
3283238	Nov, 1966	Huge et al.	323/75.

Other Refs:
Primary Examiner: Miller, Jr., Stanley D.
Assistant Examiner: Davis, B. P.
Attorney: Kemon, Palmer & Estabrook