Micro inverter is an end equipment mostly used in residential case, the rating power of a micro inverter can range from several hundred watts to several kilowatts. The micro inverter can flexibly be used in small rooftop and balcony, and integrate the BESS to generate and store power for home appliances, which helps save electricity bills more efficiently.

In-package hall-effect current sensor can be used in micro inverter application to minimize the PCB size and improve the reliability of the system. Figure 2-10 shows the typical micro inverter block diagram with hall-effect current sensors, for example,

• AC current sampling
• Resonant tank current sampling

The AC current sampling mainly senses the 50Hz current injected into the grid, this current information can be also utilized to protect the power devices of the DC/AC converter. The AC current sampling of micro inverter has the same high accuracy and low drift requirements as those decried in previous sessions.

The resonant tank current sampling, by judging this current, accurate turning-on or turning-off of synchronous rectifier transistor and overcurrent protection can be achieved. So, the timing of this current information is very important to improve the efficiency, high bandwidth and low propagation delay of the hall sensor are required. Read more in the Synchronous Rectification Control in CLLLC Converters Based on Hall-Effect Current Sensors, application brief.

Figure 2-10 Micro Inverter Block Diagram with Hall-effect Current Sensors