Bell Telephone Laboratories

Richard H Hock

Rudolph Scuderi

Richard C Ray

Hermann Fickenscher

Phil Dewey Fisher

An uninterruptible power supply utilizes a controlled ferroresonant regulator to derive a regulated DC voltage from a primary AC source. A reserve source of DC power is coupled to the output through a DC voltage regulator which is activated when the DC output voltage of the power supply drops below a predetermined threshold.

Uninterruptible power supply with load regulation of standby voltage

A high current, high speed comparator switching circuit includes circuits to positively control turn on and turn off of switching transistors and counteract conduction overlap due to stored charge resulting from high current loads.

Comparator circuit having high speed, high current switching capability

A single-ended converter circuit combines a magnetic energy storage medium with an energy discharge path to simplify transformer design, improve transformer operating characteristics, and reduce induced electromagnetic interference. The concept is extended to self-oscillating, single-ended converters and a double-ended type is achieved by combining two single-ended converters with a single power transformer structure.

Growing community of inventors

Landing, NJ, United States of America

Richard H Hock