A Switching Loss Minimization Current Sensor-less Control for AC-DC Boost Rectifiers

This paper presents a switching loss minimization, current-sensor-less control algorithm for AC-DC boost rectifiers. The current sensors are eliminated by aligning the modulation signals with the line currents. The zero sequence signals added to the modulation signals are properly selected such that the switching devices are clamped at the regions where the phase currents are high. This method results in the reduction of the device switching losses. The steady state analysis and simulation results included in the paper validate the proposed control scheme. This simple and robust control scheme is especially good for high power low dc output voltage applications and it renders close to unity input power factor.