Single Resistor Current Sensing and Reconstruction Method for Phase Currents in Inverters

Current sampling is very important for space vector pulse width modulation(SVPWM) control.In the low-cost applications,the reconstruction method based on the single resistor bus current sampling has a competitive advantage.In the different voltage vectors,the relationship between DC-bus current and phase currents of SVPWM controlled three-phase inverter was analyzed.In view of this,combined with characteristics of single resistor current sampling,a control method of indirect synthesis of command vectors was proposed to make the current reconstruction realized in whole region.Using the Freescale DSP8013,experiment platform is established and the SVPWM is employed.The experimental results demonstrate the correctness and feasibility of the proposed scheme.