Description

This design is a digitally controlled, grid-tied, single phase, full-bridge DC/AC inverter stage for use in central or string solar inverters. It is a companion to TI Design TIDM-SOLAR-DCDC, a front-end DC/DC converter with maximum power point tracking (MPPT). Together, the TIDM-SOLAR-DCDC and the TIDM-SOLAR-ONEPHINV comprise a complete solar inverter for central or string topologies. A C2000 F28M35H52C microcontroller (MCU) is the digital controller for the full-bridge DC/AC inverter stage, efficiently operating the inverter stage while additionally implementing Ethernet-based remote control and monitoring of the inverter. The inverter output is grid-tied with anti-islanding protection. This design achieves total harmonic distortion (THD) of less than 5 percent, and full load efficiency greater than 96 percent, providing more energy extraction from a solar installation, reducing detrimental heat dissipation in the inverter, and increasing inverter longevity.