Automatic feedback system for a dual output power supply

Details Automatic feedback system for a dual output power supply Automatic feedback system for a dual output power supply

1995-01-13

1996-06-25

Nguyen, Matthew V.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 21, H02M 324, H02M 3335

Patent

active

055306365

ABSTRACT:
A feedback system coupled between both outputs of a dual flyback converter for detecting which output is loaded and for switching between one of two feedback circuits for regulating the voltage of the loaded output. The detection circuit includes a balanced voltage divider coupled in series between the two opposite polarity outputs. The voltage divider preferably comprises balanced high impedance resistors to prevent substantial loading. The voltage of the junction between the two resistors shifts away from the loaded output because of an increase of the voltage level of the unloaded output caused by leakage inductance of the switching transformer. The detection circuit also includes a comparator, which detects the voltage shift and asserts its output to a switch circuit, which switches control between the two feedback circuits to control the loop and appropriately regulate the loaded output voltage. The switch circuit is preferably an analog switch including one or more field-effect transistors.

REFERENCES:
patent: 4870553 (1989-09-01), Brown
patent: 4922399 (1990-05-01), Tsuzuki
patent: 5285367 (1994-02-01), Keller
patent: 5313381 (1994-05-01), Balakrishnan
patent: 5394017 (1995-02-01), Catano et al.
patent: 5408402 (1995-04-01), Nonnenmacher

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