Selectable pulse width modulator

Claim 1

A selectable pulse width modulator comprising: a. first, second, ... nth energy storage circuits each having an input and an output terminal, b. a first changeover circuit for selectively connecting the input terminals of the first, second, ... nth energy storage circuits to a DC power source, c. an electronic switching circuit for connecting to a reference potential point one of the input terminals of the first, second, ... nth energy storage circuits selected by the first changeover circuit, d. a load circuit connected to the output terminals of the first, second, ... nth energy storage circuits in common thereto, each of the first, second, ... nth energy storage circuits including a satUrable transformer consisting of a primary winding, a secondary winding and first, second, ... nth bias windings, a low potential energy storage means connected at one end to the input terminal and at the other end to the primary winding of the saturable transformer and a high potential energy storage means connected at one end to the secondary winding of the saturable transformer and at the other end to the output terminal, the time constants of the first, second, ... nth energy storage circuits determined including the high potential energy storage means being different from one another, the first bias windings of the first, second, ... nth energy storage circuits being interconnected in series relation with the first bias winding of the first energy storage circuit being opposite in polarity to those of the other second, third, ... nth energy storage circuits and the series circuit being connected at a first bias terminal, the second bias windings of the first, second, ... nth energy storage circuits being interconnected in series relation with the second bias winding of the second energy storage circuit being opposite in polarity to those of the other first, third, ... nth energy storage circuits and the series circuits being connected to a second bias terminal, ... the nth bias windings of the first, second, ... nth energy storage circuits being interconnected in series relation with the nth bias winding of the nth energy storage circuit being opposite in polarity to those of the other first, second, ... (n-1)th energy storage circuits and the series circuit being connected to an nth bias terminal, and e. a second changeover circuit for selectively connecting the first, second, ... nth bias terminals to a bias power source, the second changeover circuit ganged with the first changeover circuit.