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How a VFD with AFE (Active front end) operates near unity power factor ??
Many suppliers say this , but no explanation on How it does so ??
http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5630340
http://www.tmeic.com/Repository/Brochures/Drive_Application_Process_1141668947.htm
Variable Frequency Drives and Energy Savings
Optimizing Drive Systems for Energy Savings