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2kW Two-Channel Interleaved PFC Reference Design with Digital Control

The STEVAL-IPFC02V1 2kW interleaved PFC reference design from STMicroelectronics features the performance of analog cycle-by-cycle current regulation and the flexibility of digital control to generate sinusoidal supplies with very high power factor and very low harmonic distortion.

Digital control is based on the STNRGPF02 digital PFC controller, which can drive up to two interleaved PFC channels using mixed signal (analog and digital) average current mode control in CCM at fixed frequency.

The 2kW interleaved PFC reference design consists of a power board with 2-channel interleaved CCM boost power stage, auxiliary power supply, a control board with embedded STNRGPF02 digital controller and a small adapter board for programming the STNRGPF02.

eDesignSuite is the tool available in the ST website to configure the STNRGPF02 according to specific design requirements for each interleaved PFC.

STEVAL-IPFC02V1 2 kW interleaved PFC reference design (click in diagram to enlarge)

Key Features:

  • Input voltage range: 90- to 265-Vac
  • Line frequency range: 47 to 63 Hz
  • Maximum output power: 2kW at 230Vac
  • Inrush current limiter
  • Output voltage: 400V
  • Power factor: > 0.98 at 20% load
  • Total harmonic distortion: <5% at 20% load
  • Mixed-signal average current mode control, CCM fixed frequency operation
  • Switching frequency (fsw): 60kHz
  • Cycle-by-cycle regulation (analog current control loop)
  • Input voltage and load feed-forwards
  • Phase shedding
  • Current balance
  • Burst-mode operation
  • Overvoltage protection
  • Overcurrent protection
  • Thermal protection
  • Status indicator LEDs
  • Cooling function