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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


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.

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&Noise cancellation by interleaving Redundant Power Supplies

Noise cancellation by interleaving Redundant Power Supplies


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&


, Line Frequency Ripple&



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...