Implementation of Real-Time Digital Control for Phase Shifted Full-Bridge Rectifier Using Texas Instruments' ARM Cortex-R5F Core Based MCU

Conditioning of digital power plays a crucial role in this era of booming electric vehicle (EV) and renewable energy harvesting industry. Most of these applications consist of two fundamental stage of power conversion. One is AC to DC conversion stage followed by a DC to DC conversion stage or vice-versa. Due to the ease of controllability, the phase shifted full-bridge (PSFB) rectifier is often selected as the go-to solution for transferring bulk amount of power from the high voltage (HV) DC to the low voltage (LV) DC side with electrical isolation. One such simple control scheme that can be used in this application is called peak current mode control (PCMC). The power transfer happens from the HV to LV side when the turn ON period of diagonally opposite switches of two legs overlap with each other. In PCMC, this overlapping period is controlled by setting the peak current value suitably. On top of this, an outer voltage control loop is implemented to maintain the output voltage at the desired level. In this work, the control mechanism is implemented using TMDSCNCD263 SITARA MCU of Texas Instruments (TI). This work showcases industry standard ARM Cortex-R5F core MCU based real-time digital control implementation for digital power conversion application. Test results are obtained by conducting experiment on the PSFB converter of TIDM-02009 reference design.