Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1992-10-13
1994-03-15
Sterrett, Jeffrey
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 97, 363134, H02M 3335
Patent
active
052950581
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.
REFERENCES:
patent: 4489369 (1984-12-01), Ginsberg
patent: 4691275 (1987-09-01), Moscovici
patent: 4695934 (1987-09-01), Steigerwald et al.
patent: 5155672 (1992-10-01), Brown
patent: 5218522 (1993-06-01), Phelps et al.
patent: 5245220 (1993-09-01), Lee
Motorola Linear/Interface Devices, Technical Specification Manual, Technical Specification for Motorola Device TL494 Switchmode Pulse Width Modulation Control Circuits, pp. 3-312 to 3-320, date and place of publication unknown.
Recoton Corporation
Sterrett Jeffrey
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