Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Ripple&Noise cancellation by interleaving Redundant Power Supplies

IP.com Disclosure Number: IPCOM000198190D
Publication Date: 2010-Jul-29
Document File: 3 page(s) / 71K

Publishing Venue

The IP.com Prior Art Database

Abstract

This disclosure introduces a new method to cancel the ripple&noise by interleaving the redundant power supplies output voltage. It bring a great achievement on design optimization and cost saving.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 54% of the total text.

Page 1 of 3

Ripple&

&Noise cancellation by interleaving Redundant Power Supplies

Noise cancellation by interleaving Redundant Power Supplies

Ripple&

Noise is one of important parameters of Electrical Signal Quality

                                          , especially for output voltages of Power Supply. The higher the output wattage is, the more Electrolytic Capacitors and LC filters we need. Meanwhile, more E-Caps, LC filters will bring more problems (like: more cost, impact the loop response etc). At present, Power Designers only focus on how to decrease the Ripple&

Noise on one Power Supply itself

. It

causes that there are a lot of E-caps in every power supplies even in Redundant application environment. The Ripple&

Noise of power supply are consist of three components

: switching Frequency Ripple&

Noise

, Line Frequency Ripple&

Noise

(for

example:120Hz) and thermal noise of electrical components. In which, the Switching Frequency Ripple&

Noise is the majority. The following

innovative idea is to decrease the Switching Frequency Ripply&

Noise by using the advantage of Redundancy of Server Power Supplies to cancel

each other. Refer to Fig 1: Schematic, for a typical "1+1" server sytem,2 power supplies: PSU 1 and PSU 2.Oring-Diode Q1 and Q2 (or Oring-FET).The Cathodes of Oring-Diode Q1 and Q2 are output voltages.2 Power supplies output connect together to get Output Voltage Bus which supply the Server system.

Now, sense the voltages at the anode of Oring-Diode Q1 and Q2 via BLUE line, by using C1 and C2 to get t...