Compaq Computer Corporation, Inc.

Hewlett-packard Development Company, L.p.

George A Kaminski

George Farris Squibb

Mark R Trace

William M Fulghum

A method and related structure for reducing the harmonic distortion on an input signal line of a switching power supply accomplished by a first or upstream power supply adjusting the input voltage such that the duty cycle of conduction or switching signals applied to each phase of a switching power supply have no significant overlap or gap.

System and method for adjusting an input voltage to a switching power supply while keeping the output voltage constant

A method and system for controlling the power supply fan in a computer system. The speed of a power supply fan can be made directly proportional to the temperature of the power supply. The fan speed can also be controlled by a processor with software commands according to the temperature of the processor. The speed of the fan will be dictated by the higher of the two commands driving it. Therefore, the power supply fan can never be commanded by the processor to run at a lower speed than that required by its own thermal environment. A Fan Speed Control Circuit enables the computer system to command the power supply fan to run at a higher speed. The processor temperature can be monitored with a temperature transducer and analog signal conditioning circuitry.

Dual control of fan speed-input corresponding to power supply temperature or software command from the processor corresponding to processor temperature

Dual power supply fan control&mdash;thermistor input or software command from the processor

A structure and related method for generating phase enable signals for a multi-phase switching power supply with the characteristic that each signal has the same frequency, but each differs in phase relationship. The structure includes a clock circuit coupled to a shift register and clocking the shift register. The shift register has one of its outputs coupled to its shift input signal line. Clocking of the shift register with the clock circuit produces a series of phase enable signals, at the shift register's shift output signal lines, to be coupled to switching phases of a multi-phase switching power supply. The circuit easily adapts to varying number of phases of the multi-phase switching power supply by changing which of the several shift output signals couples back to the shift input signal.

Phase control for a computer system multi-phase power supply

A control circuit for the regulation of fan speed control in a computer power supply with software controlled shutdown and automatic restart for over-temperature protection. The control circuit overrides the control inputs when the temperature inputs indicate a temperature above a specific level.

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Houston, TX, United States of America

George A Kaminski