Dell Products Inc.

Ashish Razdan

Lei Wang

Mehran Mirjafari

Stuart Allen Berke

Mark A Muccini

William Draper

Padmanabh R Gharpure

John Evren Jenne

A power supply unit includes a rectifying module to rectify an alternating current (AC) voltage, a first bulk capacitor to receive the rectified AC voltage from the rectifying module, a first transistor coupled in series with the first bulk capacitor, an AC input monitoring circuit, and a current source. The AC input monitoring circuit holds the first transistor in an OFF state in response to a detection of an AC voltage dropout. The current source adopts an adaptive gate voltage to control the first transistor in response to a detection of the AC voltage being re-applied, and turns on the first transistor based on the adaptive gate voltage to limit a re-rush current within the power supply unit after the AC voltage is re-applied.

Power supply unit with re-rush current limiting

A power supply circuit includes a rectifier module configured to rectify an input voltage and a capacitor including a first terminal coupled to the rectifier module. In addition, the power supply circuit includes first and second transistors. The first transistor couples to a second terminal of the capacitor, and the second transistor couples in series to the first transistor. The power supply circuit also includes a resistor, configured to set an inrush current value, in parallel with the second transistor. When coupled to a power supply, the power supply circuit is configured to turn-on the first transistor such that an inrush current flows, at the inrush current value, through the capacitor, first transistor, and resistor. After a delay time, the power supply circuit is configured to turn-on the second transistor such that the inrush current drops to around zero, thus maintaining a low impedance path during steady-state operation.

Constant inrush current circuit for AC input power supply unit

A method of power supply unit rotating in an information handling system (IHS) may include a control unit dividing a power loading of an IHS into N sections, where N corresponds to a number of power supply units coupled to the IHS. The control unit may configure a first power supply unit to an active state and configure one or more remaining power supply units to a suspended state during a first time period. The control unit may configure the first power supply unit to the suspended state and configure a second power supply unit to the active state in response to a second time period being reached. The control unit may rotate the active state among the power supply units in response to sequential time periods being reached. In an embodiment the control unit may rotate the active state sequentially between each of the subsequent power supplies.

Methods of power supply unit rotating in an information handling system

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Round Rock, TX, United States of America

Ashish Razdan