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Switching Power Supplies A to Z
Switching Power Supplies A to Z, by Sanjaya Maniktala (Newnes), starting at $43.50
Home » Power
Antec TruePower Quattro 850 W Power Supply Review
Author: Gabriel Torres
Type: Reviews Last Updated: May 15, 2008
Page: 4 of 10
$ Check REAL-TIME pricing for Antec TruePower Quattro EPS12V v2.91 & ATX12V 1000W Computer Power Supply TPQ1000 80 PLUS Certification SLI Certified ROHS Active PFC Supports PCI-E SATA EPS12V/ATX12V Com $.
Directron: $167.98 Newegg: $179.99
Wal-Mart: $207.82 Amazon: $179.99

Primary Analysis
Hardware Secrets Bronze Award

Let’s now take an in-depth look on the primary stage from Antec TruePower Quattro 850 W. For a better understanding, please read our Anatomy of Switching Power Supplies tutorial.

This power supply uses two GBU1005 rectifying bridges connected in parallel on its primary, each one capable of delivering up to 10 A at 100º C, so the total capacity is of 20 A at 100º C. These two bridges are attached to a heatsink. This section is clearly overspec'ed: at 115 V this unit would be able to pull up to 2,300 W from the power grid; assuming 80% efficiency, the bridges would allow this unit to deliver up to 1,840 W without burning thse components. Of course we are only talking about this component and the real limit will depend on all other components from the power supply.

Antec TruePower Quattro 850 W
click to enlarge
Figure 10: Rectifying bridges.

The active PFC circuit uses two STW25NM50N power MOSFET transistors, each one capable of handling up to 14 A in continuous mode at 100º C (or 22 A at 25º C; see the difference temperature makes) or 88 A in pulse mode at 25º C. These transistors are located on the same heatsink as the switching transistors.

On the switching section this power supply uses a rather different design. It uses a modified single-transistor forward configuration using a second transistor in the place of the required diode. The main transistor is a STW15NK90Z, capable of delivering up to 9.5 A continuously at 100º C (or 15 A at 25º C; once again see the difference temperature makes) or 60 A in pulse mode at 25º C. The second transistor that was installed replacing the diode is a FQPF8N80C, which can deliver up to 5.1 A at 100º C (8 A at 25º C) continuously or up 32 A in pulse mode.

Antec TruePower Quattro 850 W
click to enlarge
Figure 11: Switching transistor, support transistor, PFC diode and active PFC transistors.

The primary section is controlled two separated integrated circuits, one for the active PFC circuit (ICE1PCS02) and one for driving the switching transistor (i.e. PWM, NCP1280), instead of using just one combo controller as it happens with almost all modern power supplies. These integrated circuits are located on separated small printed circuit boards that are attached to the main printed circuit board.

Antec TruePower Quattro 850 W
click to enlarge
Figure 12: Active PFC controller.

Antec TruePower Quattro 850 W
click to enlarge
Figure 13: PWM controller.

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