Flextronics Ap, LLC

Pmc-sierra, Inc.

Flextronics Sales & Marketing(a-p)ltd.

James Robert Hamstra

Paul Holdredge

Winston K Mok

Aaron Jungreis

David Walden Wong

Richard Cam

Dan Gorcea

Kieran Miller

John MacAskill

A regulated power supply apparatus and method is provided. A converter circuit is configured to generate a regulated voltage signal from an unregulated voltage signal. A power sequencing circuit includes an unregulated voltage source input terminal and is configured for coupling an unregulated voltage signal to an unregulated voltage signal input terminal of the converter circuit. The power sequencing circuit includes an enable output coupled to the enable signal input terminal and includes a power limiting circuit and a trigger circuit. The power limiting circuit includes a first cascade of discrete analog components as controls for a first switching element and the trigger circuit includes a second cascade of discrete analog components as controls for a second switching element. The first cascade is configured as a charge control circuit for controlling a rate of charge of a first filter network and includes a zener diode coupled in parallel. The second cascade is configured as a detector of voltage levels and generates the enable signal. The first and second switching elements are semiconductor switches. The first filter network is coupled upstream of the converter circuit and a second filter network is coupled downstream. In an exemplary embodiment, the converter circuit is a DC to DC bus converter circuit and the regulated power supply apparatus is a fan controller circuit.

Coordinated power sequencing to limit inrush currents and ensure optimum filtering

An air inlet diffuseris disclosed for attachment relative to an air inlet openingof an electronics enclosure. The diffuserextends into the electronics enclosureand provides an increased surface area through which EMI attenuating apertures may be formed. The diffuseralso reduces the amount of structure that is disposed within the air inlet openingthereby reducing impedance to airflow through the openinginto the enclosure. The increased surface are of the diffuserallows for increasing the number of EMI attenuating apertures that may be utilized for a given inlet opening. In one embodiment, the total open area of the EMI apertures is greater than the open area of the air inlet opening. In such an embodiment, the EMI apertures provide low impedance to airflow through the diffuserand increased airflow in conjunction with EMI attenuation may be realized.

Air inlet diffuser

Generally, a DC power filter and its associated components are presented herein. The DC power filter may operate in a telecommunications chassis between one or more electrical sources and one or more loads. A common mode noise shunt may be included to shunt noise from more than one of the electrical sources or loads together. Additionally, the DC power filter may include protection circuitry that is coupled to more than one of the electrical sources. The protection circuitry may include a combination of diodes and other transient voltage suppression devices.

Power filter

A method of interfacing for packet and cell transfer between a first layer device and a second layer device, which includes dividing control information into an in-band portion and an out-of-band portion, transmitting the in-band portion in the data path, and transmitting the out-of-band portion outside of the data path.

System interface for cell and/or packet transfer

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Tigard, OR, United States of America

James Robert Hamstra