Adc Dsl Systems, Inc.

Pairgain Technologies, Inc.

George Bertram Dodson, Iii

A fan control system uses a closed loop system to adjust the actual operating speed of a fan or fans to a desired operating speed. The desired speed and actual speed are compared in a high gain amplifier to generate a control signal to adjust the actual operating speed of the fan given the feedback.

Fan control system

Apparatus and method for increasing the bandwidth of an optocoupler includes cascode coupling the optocoupler driver transistor with a buffer so as to reduce voltage variations across the driver transistor.

High speed optocoupler

A low cost differential voltage limiter circuit provides a feedback to regulate a voltage output of a voltage source. In one embodiment, the limiter circuit includes a transistor coupled to outputs of first and second voltage sources. If a differential voltage between the two sources exceeds a predetermined threshold, the output voltage of the higher source is reduced. In one embodiment, a PNP transistor is used to regulate the high voltage source.

Differential voltage limiter

The invention provides a stabilized power converter having an input voltage and an output voltage, where the stabilized converter operates similar to a conventional converter under normal conditions, and operates continuously at the maximum power transfer point during overload conditions. The stabilized converter comprises a voltage control loop for regulating output voltage, and a stabilization loop for regulating input voltage. In a preferred embodiment, the stabilization loop senses the input voltage to the stabilized converter and compares it to a reference voltage. Whenever converter input voltage is above the maximum power transfer voltage, no action is taken by the stabilization loop, and the converter operates in the conventional manner. As converter input voltage approaches the maximum power transfer voltage, converter output voltage and corresponding converter input and output power are reduced to compensate.

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Glendale, CA, United States of America

George Bertram Dodson, Iii