Page 3 - Physical Look - Inside
In order to further investigate the design details of the SAMA G1000 1000W power supply unit, some panel removal is required. It is important to note two important concerns before disassembling any power supply unit. First, certain components, such as the capacitors, may cause an electrical shock if not discharged properly. Second, your 5-year warranty can be voided. Therefore, unnecessary disassembling of a power supply unit should be avoided. Once the top panel of the G1000 is removed, a closer look of the electronic components can be revealed.
The OEM for the power supply is RSY, which is not surprising, considering this SAMA G1000 is a budget PSU. Our photo above shows an overhead view of its internal components. It features an LLC full bridge topology with DC-to-DC converters. At first glance, the build quality appears to be excellent. There are two main heatsinks inside, all of them unpainted, and almost no wires flying around.
Let us first take a look at the transient filter stage of the power supply unit. The function of the transient filter stage is to protect the computer from the power grid noise and voltage spikes. In the SAMA G1000 1000W power supply unit, the transient filter stage contains two X-capacitors, six Y-capacitors, two common mode chokes, and one metal oxide varistor. The MOV here is to prevent the computer from being damaged by lightning surges. It is worth mentioning not all the power supply units in the market have an MOV. There are two sets of X-capacitors and Y-capacitors, with one set behind the power plug and the other set found on the main PCB board.
Now, we move on to the primary side. The one big capacitor in the photo is from Rubycon, which is rated at 560uF at 420V. The temperature is rated at 105c, which is the standard in terms of durability. This one is a Japanese-brand capacitor, which costs more than those designed elsewhere, but the quality is better. For the standby PWM control, there is a INFSitronix IN2P070C. By the back side of the transformer in the photo, there is a large heatsink. On the heatsink, four Shenzhen SI SIF26N50F MOSFET transistors are used as the main switchers. Each is certified for up to 26A at 25c and typical resistance of 0.21mΩ according to the manufacturer's data sheet.
Also on the large heatsink in the above photo, there is one rectifying bridge attached to it. Unfortunately, I was unable to identify the brand and part number of the rectifier. On the left side of the transformer, there is a pair of smaller heatsinks, where you can find a pair of Wayon WML28N60C4 as the APFC MOSFETs. The Wayon WML28N60C4 is rated 600V, 13A at 100c. There is also a Diodes Incorporated DSC10A065 as the APFC boost diode. The IC for APFC control is the Texas Instrument UCC28180.
The electrolytic capacitors on the secondary side are Taiwanese brand Teapo, and they are rated at 105c. These polymer capacitors are from the Chinese brand NJcon. For a modern power supply unit, the power output from the rectifiers is +12V. Four Huayi Microelectronics HYG020N04NR1P are responsible for generating +12V, and they can provide current up to 160A continuously at 100c with a typical resistance of 2.5mΩ. The +12V output of the power supply unit can just directly use the power from the rectifiers. However, the +5V and +3.3V outputs are converted from the +12V output. The conversion functionality is mainly realized by the Infineon BSC0906NS on the DC-to-DC daughterboard. Its rated continuous drain current is 40A at 30V, 100c. It has an RDS(on) value of 4.5mΩ.
Meanwhile, there is a INFSitronix IN1S313I-SAG supervisor IC to realize over/under current and over/under voltage protection. More information about the parts mentioned in this review can be found from their respective datasheets from the manufacturer's website.
The modular cable sockets are soldered onto another daughterboard at the rear of the power supply unit. Having good soldering quality of those sockets is very important, since a significant amount of force will be applied on them when plugging or unplugging the connectors. The sockets in the SAMA G1000 1000W have very good soldering quality, and I am sure that they can handle some abuse with no problem. In the above photo, you can see a smaller board behind the sockets' daughterboard.
In terms of cooling performance, there are two things we need to pay attention to for a power supply unit, namely the heatsink and cooling fan. In this case, we can see a few aforementioned heatsinks and one cooling fan inside of the SAMA G1000 1000W. The size of the fan is 140mm in diameter. According to the website, the RL4Z S142512HH from the Globe Fan uses fluid dynamic bearings to keep noise and durability in check. The fan is designed to remain off until the PSU is loaded up to approximately 400W or 55c, whichever comes first.
Page Index
1. Introduction, Packaging, Specifications
2. Physical Look - Outside
3. Physical Look - Inside
4. Minor Tests and Conclusion
