Switching converter with open-loop primary side regulation

Details Switching converter with open-loop primary side regulation Switching converter with open-loop primary side regulation

1993-11-16

1998-09-29

Sterrett, Jeffrey L.

Electric power conversion systems

Current conversion

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

363 21, 363 97, 363131, H02M 3335

Patent

active

058153802

ABSTRACT:
The isolated, multiple output, switching converter is created with a number of unique performance characteristics. The converter operates in continuous inductor current mode (CICM) of operation for all load currents from no load to full load on all outputs despite the presence of simple rectifier diodes only on the converter secondary sides. The regulation of output voltages on all outputs against the changes of the input voltage is provided by use of a simple open-loop control circuit connected to the primary side and thus eliminating the need for isolation in the control circuit. The regulation against the load current changes in the single output case is also provided on the primary side by a load current sensing circuit. An additional benefit of the switching converter is in the elimination of the losses and voltage overshoots associated with the leakage inductance of the isolation transformer when operated as pulse width modulated (PWM) converter.

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A. Dauhajre and R.D. Middlebrook, "A Simple PWM-FM Control for Independently Regulated Dual Output Converter," Proc. Tenth International Solid State Power Electronics Conference (Powercon 10), Mar. 1993.
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