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Switching Power Supplies A to Z
Switching Power Supplies A to Z, by Sanjaya Maniktala (Newnes), starting at $94.20
Home » Power
Corsair HX620W Power Supply Review
Author: Gabriel Torres
Type: Reviews Last Updated: February 19, 2008
Page: 4 of 11
Real-time pricing for XFX P1-750B-NLG9.
XFX P1750BNLG9 Pro Series XXX Edition ATX Semi-Modular Power Supply 750W 80 Plus Silver 135mm Fan Active PFC
TigerDirect: $129.99 Newegg: $129.99
CompUSA: $129.99

Transient Filtering Stage
Hardware Secrets Golden Award

As we mentioned in other articles, the first place we look when opening a power supply for a hint about its quality is its filtering stage. The recommended components for this stage are two ferrite coils, two ceramic capacitors (Y capacitors, usually blue), one metalized polyester capacitor (X capacitor), and one MOV (Metal-Oxide Varistor). Very low-end power supplies use fewer components than that, usually removing the MOV, which is essential for cutting spikes coming from the power grid, and the first coil.

This power supply from Corsair uses one MOV, four ceramic capacitors, one metalized polyester capacitors and three ferrite coils, plus a ferrite bead on the main power cord, so it has one coil more than required.

Corsair HX620W Power Supply
click to enlarge
Figure 10: Transient filtering stage (part 1).

Corsair HX620W Power Supply
click to enlarge
Figure 11: Transient filtering stage (part 2).

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