Improved immunity of current sensorless AC-DC converters for mains voltage disturbances

AC-DC converters can be succesfully controlled without line current sensors or estimators. This approach is generally referred to as indirect current control (ICC). However, the lack of actual line current information renders the converter susceptible to mains voltage disturbances. Inductor voltage control (IVC) requires no line current measurement or estimation. IVC was recently shown to be successful for the control of buck-type AC-DC converters, which exhibit continuous inductor voltage waveforms. In this paper, the IVC approach is extended and applied to the discontinuous inductor voltage waveforms of boost-type AC-DC converters. To demonstrate its use, a basic IVC control loop is implemented to improve the immunity for mains voltage disturbances of an ICC boost-type AC-DC converter. The results are verified on a 400 V, 2.2 kW prototype