Component Analysis

Before reading this page, we strongly suggest a look at this article, which will help you understand the internals of a PSU better.



This is a new, highly capable platform from CWT with a high maximum capacity and quiet operation despite its increased power density, which usually calls for a noisy fan-speed profile. On the secondary side, we meet a half-bridge topology and an LLC resonant converter. In contrast, on the secondary side, a synchronous rectification scheme is used for +12 V. The minor rails are generated through a pair of voltage regulation modules (VRMs). Finally, the design is clean, and no power cables obstruct airflow.


The transient filter has all the necessary components.


The platform uses an MOV to suppress power surges, and there is also an NTC themistor-relay combo to lower inrush currents.


Two bridge rectifiers are installed in parallel.




The main switching FETs, provided by Vishay, are installed in a half-bridge topology. An LLC resonant converter helps in achieving higher efficiency.


The +12 V FETs are on a vertical board, which is connected to the main transformer through two thick and short cables to keep energy losses low.


Most of the filtering caps belong to good lines, and besides electrolytics, a lot of polymer caps are also used.


Both VRMs use the same ANPEC PWM controller.


A small board hosts a major part of the 5VSB regulation circuit.


Lots of polymer caps are installed at the face of the modular PCB.


The supervisor IC responsible for the majority of protection features is an IN1S313I-SAG.


Soldering quality is good.


Another Hong Hua fan. This manufacturer has firmly established itself in the PSU market. However, lately, I am not fully satisfied with their products since I have recently seen some Hong Hua fans with balancing and vibration issues, which increases noise output.