Single-Stage DAB-Based Solar Microinverter

The microinverter is a high‑power, single‑stage solution capable of delivering up to 500W using GaN power switches for high efficiency and power density. Its architecture includes a primary full-bridge, high‑frequency isolation transformer, and a secondary AC/AC bridge using Renesas GaN bi-directional FETs, enabling fast, low‑loss switching and maintaining THD ≤3% for both on‑grid and off‑grid 50/60Hz operation. Compared to conventional flyback‑based microinverters, typically limited to <250W and requiring multiple stages, this design achieves higher power with fewer components, improved efficiency, and significantly higher power density. Soft‑switching across wide input and load ranges further enhances overall system performance.

System Benefits:

• High power conversion efficiency up to 97% achieved using Renesas GaN bi-directional switch (BDS) with low on‑state resistance and low switching capacitances.
• High power density enabled by high‑frequency switching, allowing for compact magnetics and a smaller overall design.
• Capable of operating with low THD <3%, ensuring good power quality in both on-grid and off-grid operation.
• Minimum BOM with best-in-class Renesas components ensuring overall best system performance throughout the varying line and load conditions.
• Features an Arm^® Cortex^® MCU providing real‑time monitoring, power‑flow control, and MPPT algorithms.