Implementation of a Protected Low-Cost Voltage-Source Inverter

This paper considers the design of low-cost voltage source inverter of the fan of air-conditioner. It was suggested to use the cheapest drivers and implement short-circuit protection using current transformers. The signal of the current transformers drives the protection circuit and provides the response time of the short-circuit protection of 1 us. The measurement circuit provides enough data for overcurrent, phase loss and thermal protection and the algorithms of detection of these faults are explained. The performance of the proposed solution was examined at the experimental setup and proved its reliable operation.