ocaholic - Corsair RM650 Review - PSUs

Corsair RM650 Review

Published by Marc Büchel on 23.09.13

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A Look Inside

AC socket and EMC/EMI filtering to meet EMI/EMC regulatory requirements
Diode bridge for AC/DC rectification of the incoming AC voltage
PFC inductor for power factor correction
Relay and thermistor for inrush current control
PFC MOSFETs and diode
PFC/PWM control board
Bulk aluminum electrolytic capacitors
PWM MOSFETs
Main transformer
+5Vsb transformer
PWM synchronous rectification board
+5Vsb rectification
Secondary thermistor
PWM inductor

The Design is based on a strong 12V PSU using the LLC resonance converter Topology. 3.3 and 5V are generated from 12V using DC-DC converter. This topology is very common in modern PSU's.

Right on the AC input there are two Y capacitors for burst pulse filtering. On the main PCB there is a fuse, two Y, two X Caps one MOV and two CM Chokes for input filtering. The rectification is done using a GBU1510 (10A, 1000V) fixed to a heatsink. The APFC uses two Mosfets and a ROHM SCS110AG (600V, 10A) Sic diode. One Panasonic (400V, 470uF, 105C) is used as APFC capacitor. The LLC Resonance converter is controlled by a CM6802. On the primary side there are two 22N60S1 main chopper Mosfet's. In case of the heatsink, there is an aluminium profile.

The 12V rectification Mosfets - 6x M3006D - are located at a daughter PCB. These are well cooled and do not have their own heatsink. On the secondary side Capxon 105C capacitors are used for DC filtering. The 3.3 and 5V converters are located on the back of the PCB. All in all it's not a very high-end design but still price/performance-wise it's well done.

It's very nice to see that there is clean separation between primary and secondary side, which isn't standard with quite a lot of other power supplies in this price range. Other than that Corsair is using a modern LLC resonance converter topology.