Importance

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Abstract

A pulse width modulated DC to DC voltage converter for producing selectable differential output voltages. A feedback voltage and a selectable error voltage are fed back to the controller to control the pulse width by the difference between them. First and second power switches are respectively operable in response to first and second square wave signals output from the controller. The converter includes a center-tapped transformer having first and second output terminals. The outputs from the first and second output terminals are filtered and rectified into respective nominally positive and negative DC output voltages. A first selector switch for selectively connecting the nominally negative voltage output terminal to either a grounded bus or a negative bus is mechanically ganged to a second selector switch having a plurality of positions for selecting one of a plurality of predetermined error voltages. Movement of the selector switches changes the values of the positive and negative DC voltages at the respective output terminals.

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First Claim