Other

Compaq Computer Corporation, Inc.

Kris P Dehnel

Robert S Wright

Bassam N Elkhoury

Russell J Wunderlich

The present invention relates to a fault tolerant system for providing power to a multiple central processing unit computer system. Three DC-DC converters, each sized for providing power to one central processing unit, furnish power to two central processing units through two power planes. Each DC-DC converter has an output voltage level selectable through a voltage identification signal. If the voltage identification signals of the converters match, identification logic couples the power planes together. If only one converter is available to power the two central processing units, a stopclock logic circuit alternatively places the central processing units in known stopclock modes. Thus, the single converter only has to fully power one central processing unit at any one time.

Redundant CPU power system

An AC adapter that allows a lower power rating while still providing the necessary power to a load which is substantially constant over a varying voltage range and to charge a discharged Ni-Cad battery in a desired time. The AC adapter regulates its output power to a maximum level just greater than the maximum of the load rather than providing a controlled current until a predetermined fully charged voltage is attained. In this manner, the output voltage and current are allowed to vary inversely with respect to each other in order to maintain the desired power level, allowing the output current level to be reduced as the voltage level increases. A regulated voltage mode is also provided to keep the output voltage from rising above a predetermined maximum level should the Ni-Cad battery be disconnected. One preferred embodiment includes a regulated current mode wherein the current through the Ni-Cad battery is maintained at the desired trickle level once the battery is fully charged.

Growing community of inventors

Cypress, TX, United States of America

Kris P Dehnel