Converter output regulation via channel resistance...

Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter

Reexamination Certificate

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Details

C363S021060, C363S021100, C363S021140, C363S021180, C363S026000

Reexamination Certificate

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06330169

ABSTRACT:

BACKGROUND
This invention relates to dc-to-dc power supplies for converting a single input voltage into two or more dc output voltages typically sense a single output voltage, usually the output voltage delivering the highest output power, and precisely regulate that output voltage while roughly regulating any additional output voltages. The precise regulation of a second or any number of additional output voltages is typically achieved by the use of dedicated individual series regulators, each output having its own series or pass regulator and a dedicated feedback amplifier. Post regulation using series or pass regulators is inefficient because of the energy lost in the series pass transistor and costly in terms of the additional parts required for each individual output voltage.
FIELD OF THE INVENTION
This invention relates to the field of power supplies and more particularly to the field of power converters designed for use in industrial, office or household appliances for the conversion of a single source of dc voltage to a plurality of output voltage sources.
SUMMARY OF THE INVENTION
In a switched-mode regulator, a first control system adjusts the ratio of an input switch's on time to off time to control a first output voltage to remain within a predetermined range that is proportional to a precision reference voltage. The first control system synchronizes a gate drive signal to a first synchronous rectifier. The first synchronous rectifier gate is driven to be fully on or off. Synchronous rectification is discussed in U.S. Pat. No. 6,069,804, BI-DIRECTIONAL DC-TO-DC CONVERTER, issued on May 30, 2000, to Thomas M. Ingman, John W. Beecroft, and Charles E. Mullett, the content of which is incorporated herein by reference in its entirety. A second control system samples a portion of a second output voltage and controls the synchronization and peak voltage swing of a gate drive signal to a second synchronous rectifier that controls a second output voltage. The peak swing of the gate drive to the second synchronous rectifier adjusts the channel resistance of the second synchronous rectifier to regulate the second output voltage to remain within a predetermined range.


REFERENCES:
patent: 5336985 (1994-08-01), McKenzie
patent: 6049471 (2000-04-01), Korcharz
patent: 6069804 (2000-05-01), Ingman

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