Great Wall 3200W SiC Server PSU Uses Two Allegro CT431 Isolated Current Sensors
2026-09-30 · Compiled by Best IT Parts from public industry reporting
A teardown of the Great Wall SLIM3200C, a 3200W silicon-carbide server power supply, shows two Allegro MicroSystems CT431-HSWF30MR TMR isolated current sensors mounted on a dedicated current-sensing daughter board near the AC input. The unit accepts 100-127V and 200-240V AC as well as 240V DC input, reaches 3200W at high line, and is rated 12.2V/262A on the main output.
The platform uses an interleaved totem-pole PFC front end with SiC MOSFETs on the high-speed leg, followed by a full-bridge LLC and synchronous rectification. In that arrangement the controller needs continuous primary-side current information to shape the input current waveform, so the sensor output feeds both PFC current-loop regulation and abnormal-current detection for over-current protection.
The CT431-HSWF30MR is the 30A bidirectional version, offering 1MHz signal bandwidth and roughly 300ns response time, which limits sampling-chain latency in a fast-switching SiC PFC stage. Its integrated current-carrying conductor has a typical resistance of 0.5milliohm, cutting insertion loss and heat compared with a shunt-plus-isolator chain at the continuous currents a 3.2kW front end draws.
Isolation is rated at the 5kV class, keeping the high-voltage power stage separated from the low-voltage control side. Total output error is as low as 0.5% FS and the device operates from -40C to 125C. For repair and distribution channels, the design illustrates how current sensing in 3kW-class server supplies is moving toward faster, lower-loss and more highly integrated front-end sampling.
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Technical details are reproduced as reported. Verify specifications against the original source before design or procurement decisions.