Offering a complete solution for high-voltage charging for both industrial and automotive applications, the STEVAL-11BID1KCB 11-kW bidirectional battery charger developed by STMicroelectronics consists of two power stages: a power-factor-correction (PFC) and an isolated DC-DC stage.
The PFC stage leverages a three-phase full-bridge topology, and the DC-DC section features a dual-active-bridge (DAB) topology. Both stages are based on the ACEPACK DMT-32 silicon-carbide (SiC) power module.
The board uses two control boards for the PFC and DC-DC stages; the control boards are based on the STM32G474RE microcontroller. The PFC stage has a 70-kHz operating frequency, while the DC-DC stage operates at a fixed switching frequency of 100 kHz.
Maintaining a peak system efficiency of 96%, other features of the charger include a PFC stage 3-phase, 2-level bidirectional AC-DC power converter with a rated nominal AC voltage of 400 V AC at 50 Hz, and a rated nominal DC voltage of 800 V DC.
Nominal power is 11 kW, and in rectifier mode, the power factor is greater than 0.99. Coupled with inrush current control, soft startup, and active and reactive power control, the charger presents an integrated grid-connection solution. The DAB switching frequency of 100 kHz and soft-switching behavior are enabled by enhanced modulation management.
Related links:
