Sensorless Current Estimation and Sharing in Multiphase Buck Converters

摘要: Virtually, all of the current-sensing methods for power converters presented to date rely on a priori knowledge circuit parameters ensure accurate current measurement. Also, advent digital control in low-cost high-volume applications-such as voltage regulator modules (VRMs) computer microprocessors-has added challenge and cost analog-to-digital conversion this task. This paper introduces parameter-independent, sensorless current-sharing algorithm multiphase based gradient estimation via low-frequency perturbation per-phase duty cycles, thus eliminating need sensing. Measures only input output voltages are required, so converter (ADC) communication/interfacing overhead is low. The demonstrated through both simulation experimental implementation using digitally controlled three-phase buck converter.