A Look Inside

Before reading this page we strongly suggest to take a look at this article, which will help you understand the internal components of a PSU much better.

Although we already described this platform in the Kingwin STR-500 review we will open this sample to see if we will find any differences.


As expected, once we removed the large top heatsink we find two enormous heatsinks underneath. The first is for the APFC mosfet&boost diode and the second for the primary mosfets. Also we easily figured out that an LLC converter is utilized to provide higher efficiency (tip: the easiest way to spot an LLC topology is the lack of toroidal chokes in the secondary. However be aware, when there is one or more toroidal chokes in the secondary side this doesn't automatically means that an LLC converter is not used).


On the AC receptacle there are no components of the transient filtering stage. All reside on the main PCB. There we find two coils, three X and four Y caps. We couldn't find an MOV and this is a big shame, especially in such a high class PSU.


The bridge rectifier is passively cooled by two heatsinks. In the APFC one IPW50R140CP mosfet and a boost diode (C3D10060) are used. The APFC cap is provided by Nippon Chemi-Con and for a weird reason is dressed in heatshrink. Next to it we find a thermistor for inrush current protection and a relay to bypass it once it finishes its job, to save energy dissipation on it. Similar to the identical Kingwin STR-500 as main switchers two IPP50R199CP mosfets are used and an LLC-resonant converter is utilized to give an efficiency boost.


The APFC controller is an NCP1653A IC. As standby PWM controller an ICE3B0565 is used.


In the secondary side four IPP023N04N regulate +12V and afterwards the minor rails are generated through two DC-DC Voltage Regulation Modules (VRMs). All capacitors here are from Nippon and they are mostly polymer ones. In the secondary side also resides the SF29601 LLC resonant controller (soldered on a vertical daughter-board), which controls the primary switches and does some housekeeping job too.


The main PCB supports up to five +12V rails. However here only three are used and these are shorted together to form a single rail.


On the front of the small modular PCB we find two electrolytic Nippon caps that further reduce current ripple. On the solder side of the same PCB we were left quite satisfied by the workmanship.


The main PCB has good soldering quality overall but we spotted some quite long component leads and we hate to see that in a high class PSU. Long component leads can easily cause shorts.


The top heatsink is huge, in order to absorb & dissipate the PSU's heat output more efficiently.