Rosewill Capstone 450W and 650W 80Plus Goldby Martin Kaffei on March 21, 2012 8:00 AM EST
This time SuperFlower is the manufacturer. In the pictures above we show the 650W version only since the 450W model consists of the same design. Rosewill uses a resonant converter like Enermax and Seasonic; on the input side, a half bridge circuit is used. Furthermore, the model has some small PCBs, where the one on the left side is used for +3.3V and +5V. Where needed, a protective foil against short circuits is used. The output wires are grouped together with serveral cable ties to improve airflow.
Behind the AC input are a total of four Y-capacitors, two common mode chokes, two X-capacitors, a thermistor, and a relay. Nevertheless there is no MOV. All capacitors are made by Nippon Chemicon (SMQ and KY series). In the power factor preregulator and behind we can find a few MOSFETs with a low turn-on resistance, and a PFC diode without any reverse recovery time. This is a good solution when using the continuous current mode, because the reverse recovery time causes power loss. One point of criticism is that SuperFlower should use another PCB material in a high-end product.