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99.3% efficiency, 2 kW, 3-channel interleaved totem-pole PFC with resonant ZVS digital control

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Parameter NameParameter Value
Operating RangeIndustrial
Core ProductVIPER35LD, STW70N60DM6, STY145N65M5, STM32G474QET6
ECCN US3A991.a.2
Packing TypeNot Applicable
RoHs compliantEcopack2
Package NameCARD

The STEVAL-TTPPFC01 offers a very high flat efficiency PFC solution in a full digital three-channel interleaved totem-pole topology. A conversion efficiency higher than 99.1% using ST MDmesh DM6 superjunction power MOSFETs is obtained, as well as a very high power factor and low THDi.

The PFC operates in the zero voltage switching (ZVS) resonant mode with hysteresis current control, which is fully implemented in the STM32G474QE microcontroller, thanks to the integrated DACs, fast comparators, and high-resolution timer peripheral HRTIM, to ensure a high dynamic and precise cycle-by-cycle current control.

The STEVAL-TTPPFC01 evaluation kit is a modular solution, which consists of: a power board, which contains all the main passive devices and all the daughter boards plug connectors; a control board, which embeds the STM32G474QE microcontroller; an auxiliary power supply board, which generates all the voltages for driving, sensing, MCU, etc.; three high-frequency half-bridge boards; a low-frequency half-bridge board.

Key features
  • 99.3% peak efficiency at 230 VAC, with all bias losses included
  • >99.1% flat efficiency from 30% load at 230 VAC
  • Heatsink-free and fan-free cooling
  • Input voltage range: 90 to 253 VAC
  • Line frequency range: 47 to 63 Hz
  • Maximum output power: 2 kW at 230 VAC, 1 kW at 115 VAC
  • Output voltage: 390 ± 2 V
  • Power factor: > 0.99 at full load, 230 VAC
  • Total harmonic distortion (THDi): <3% at full load, 230 VAC
  • Power section based on MDmesh SJ Power MOSFETs
  • Digital control section based on the STM32G474QET6 microcontroller
    • Hysteresis current mode control
    • Variable frequency ZVS operation
    • Average switching frequency: 60 kHz (for each channel at full load)
    • Cycle-by-cycle regulation
    • Input voltage and load feedforward
    • Phase shedding
    • Burst-mode operation
    • Overcurrent/voltage/temperature protections
    • Inrush current limiter function
  • Modular hardware architecture
  • Dimensions (cm): L x W x H = 29.6 x 9.1 x 4.5
  • Power density: 1.85 W/cm3 (30.4 W/inc3)