Topology and teardown
Great Wall is the original equipment manufacturer for all SF and SF-L devices. It is a Chinese state-owned enterprise, so it has abundant resources. The PCB is small and densely populated with components that deliver a maximum power of 1000W. The primary heat sink, which houses the bridge rectifiers among other components, is quite large, while the heat sink on the secondary side is small, as the FETs that regulate the 12V rail are installed on the bottom of the board. Overall, the build quality is high, with expensive components and near-impeccable soldering quality. Great Wall has state of the art production lines, so I expected nothing less when it came to soldering quality. I had the opportunity to visit all of GW’s factories and production lines in 2023, and production of the new SF line was taking place at the time of my visit.
The design can be found in every modern power supply today. A half-bridge topology on the primary side, after the APFC converter stage, while an LLC resonant converter increases efficiency through (almost) lossless switching. On the secondary side, a synchronous rectifier circuit with eight (instead of six as in the 850W) Infineon FETs regulates the 12-volt rail. The secondary rails are generated by two DC-DC converters that use an ANPEC PWM controller. Rubycon supplies the few electrolytic caps on the secondary side, while many polymer caps provide the ripple filtering. The fan is controlled by a digital microchip controller, which facilitates the programming of the fan speed profile. The fan uses a fluid dynamic bearing and has a diameter of 92 mm. Finally, the standby circuit uses Infineon components.
Great Wall has gained extensive experience over the years by working with Corsair in the manufacture of SFX devices and is therefore now number one in this market segment.
Component overview
Finally, I have listed all the components used for interested readers:
General Data | |
Manufacturer (OEM) | Great Wall |
PCB Type | Double-Sided |
Primary Side | |
Transient Filter | 2x Y caps, 2x X caps, 2x CM chokes, 1x MOV |
Inrush Protection | 1x NTC Thermistor SCK-056 (5 Ohm) & Relay |
Bridge Rectifier(s) |
2x Vishay GBUE2560 (600V, 25A @ 140°C)
|
APFC MOSFETs |
2x ST STP50N60DM6 (600V, 23A @ 100°C, Rds(on): 0.008Ohm) & |
APFC Boost Diode |
1x CREE C3D16065 (650V, 16A @ 150°C)
|
Bulk Cap(s) |
1x Rubycon (420V, 740uF, 3,000h @ 105°C, MXK)
|
Main Switchers |
2x Infineon IPA60R060C7 (600V, 10A @ 100°C, Rds(on): 0.060Ohm)
|
APFC Controller | Champion CM6502UHHX |
Resonant Controller | Champion CM6901X |
IC Driver | 1x Novosense NSi6602BD |
Topology |
Primary side: APFC, Half-Bridge & LLC converter
Secondary side: Synchronous Rectification & DC-DC converters |
Secondary side | |
12V MOSFETs | 8x Infineon BSC014N04LS (40V, 125A @ 100°C, Rds(on): 1.4mOhm) |
5V & 3.3V | DC-DC Converters: 4x Advanced Power AP4024GEMT (30V, 60A, Rds(on): 4.5mOhm) PWM Controller(s): ANPEC APW7159C |
Filtering Capacitors | Electrolytic: 2x Rubycon (3-6,000h @ 105°C, YXG) Polymer: 3x United Chemi-Con, 43x FPCAP |
Supervisor IC | IN1S429I-SCG (OCP, OVP, UVP, SCP, PG) |
Fan Controller | Microchip PIC16F1824 |
Fan Model | Corsair NR092P (92mm, 12V, 0.22A, Fluid Dynamic Bearing Fan) |
5VSB Circuit | |
Rectifier | |
Standby PWM Controller | Infineon ICE5QR1680AG |
- 1 - Introduction and technical data
- 2 - Unboxing, cables and protection circuits
- 3 - Teardown: Topology and components
- 4 - Load Regulation, Ripple Suppression
- 5 - Transient Response
- 6 - Hold-Up Time, Timings, Inrush-Current
- 7 - Average Efficiency and PF
- 8 - Noise and fan control
- 9 - Summary and conclusion
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