A Look Inside & Component Analysis

Before reading this page, we strongly suggest a look at this article, which will help you understand the internal components of a PSU much better. Our main tool for the disassembly of the PSU is a Thermaltronics TMT-9000S soldering and rework station. It is of extreme quality and is equipped with a matching de-soldering gun. With such equipment in hand, breaking apart every PSU is like a walk in the park!


In Win makes the GreenMe units and most of the other PSUs they offer themselves since they have the necessary expertise and the production lines to build PSUs. Although the design isn't modern, DC-DC converters are used in the secondary side for the generation of the minor rails. The primary side uses a double-forward topology, while passive components are used for the rectification of +12V in the secondary side. Finally, the main PCB is single-sided in order to save on cost.


The transient filter starts at the AC receptacle with two Y caps, and the main power cables are wrapped around a ferrite bead in an effort to suppress EMI. The second stage of the transient filter, consisting of two X caps, two Y caps after the bridge rectifier, an MOV, and two CM chokes, starts on the main PCB.


The two parallel bridge rectifiers are bolted to the primary heatsink, and their model number is GBU806. Each rectifier can handle up to 8 A of current, or double that amount combined.


The APFC uses two Infineon SPW21N50C3 fets and a BYC10-600 boost diode. The hold-up cap is provided by Panasonic (470 μF, 450 V, 105°C, HD series).


Two TK20J50D fets are used as main switchers. The combo PFC/PWM controller, a Champion CM6802 IC, resides on a vertical daughter-board. The latter is an upgraded version of the famous CM6800 found in numerous PSUs. The small transformer right in front of the vertical PCB is used for driving the main switchers.


Four PFR40L60PT SBRs in the secondary side, passive components, rectify the +12V rail. The minor rails are generated by two DC-DC converters. Each consists of two pairs of M3016D and M3004D fets, and a uP3872B PWM controller, an IC for which we found no information on the net.


All filtering caps on the secondary side are electrolytic and are provided by Teapo. Teapo makes the best non-Japanese/Korean caps.


The supervisor IC taking care of all PSU protections is installed on the main PCB. It is a Weltrend WT7579 IC.


The standby PWM controller is installed on the component side of the main PCB. It is a TNY278PN IC.


The 5VSB rail is rectified by an STPS2045CT SBR.


Soldering quality is great. We also spotted the four current sense resistors, or shunts, that provide feedback to the OCP circuit here.


The cooling fan is provided by ADDA, and its model number is AD1212LB-A70GL (12 V, 0.24 A, 1400 RPM, 56 CFM, 28 dBA). It uses ball bearings and is, although it spins up to a relatively low RPM only, noisy at full speeds in our tests. That said, it is a highly reliable fan we usually only come across in more expensive units.