STEVAL-11BID1KCB [STMicroelectronics]

The STEVAL-11BID1KCB is an 11 kW bidirectional battery charger and represents a complete solution for high voltage charging in both the industrial and automotive fields.

It consists of two power stages: a PFC and an isolated DC-DC stage.

The PFC is based on a three-phase full-bridge topology.

The DC-DC section is Dual Active Bridge (DAB) topology.

Both stages are based on the ACEPACK DMT-32 SiC power module.

The board uses two control boards for the PFC and DC-DC stages respectively. The control board is based on the STM32G474RE microcontroller.

The PFC stage operating frequency is 70 kHz. The DC-DC stage is operating at a fixed switching frequency of 100 kHz.

A peak system efficiency of 96% was achieved for the design.

• PFC stage 3-phase, 2-level bidirectional AC-DC power converter:
  • Rated nominal AC voltage: 400 VAC at 50 Hz
  • Rated nominal DC voltage: 800 VDC
  • Nominal power: 11 kWRectifier mode: Power factor: PF >0.99 Inrush current control and soft startup Inverter mode: Active and reactive power control Integrated grid connection solution
• DC-DC stage dual active bridge (DAB) power converter:
  • Nominal DC input voltage 800 V
  • Nominal DC output voltage 550 to 850 V
  • DAB: switching frequency 100 kHz
• Power section based on SiC power modules:
  • ACEPACK DMT-32 power module for high integration level
  • High frequency operation for weight and size reduction
  • Bidirectional capabilities
  • DAB soft switching behavior enabled by enhanced modulation techniques management