Feedback Controlled IPM Inverter with Single PCB Rogowski Coil Sensor

Abstract:
Inverter systems usually use a current sensor with a magnetic core, which has a major influence on total system size and cost. A newly developed printed-circuit board (PCB) Rogowski coil sensor that has a simple structure, cost efficiency, and good sensitivity in high-frequency range makes it perfect to use in inverter and converter systems with switching elements. Previous researches revealed a current reproduction method based on two or more PCB sensors. This paper proposes a practical current feedback control for inverter systems using a single PCB sensor. The sensor with a complementary analog circuit integrated into an intelligent power module (IPM) can achieve a high pow er density system. The PCB sensor measures a rate of current change from the DC line and, the op-amp integrator with a samplehold (S/H) circuit completes the reproduction process. We implemented a simple current feedback controller on a full - bridge inverter to test the method.