Average Inductor Current Sensor for Digitally Controlled Switched-Mode Power Supplies

摘要: Current-mode control in digitally controlled switched-mode power supplies typically requires analog-to-digital (A/D) conversion of at least two signals, voltage, and current. The complexity voltage A/D converters can be reduced using window techniques. In conventional current conversion, however, relatively high resolution is required over a wide range which results increased complexity, consumption, cost the controller. This paper proposes very simple feedback sensor capable high-resolution average inductor sensing analog comparators an low-pass filter. approach few external components employs minimal digital hardware resources. A dynamic model performance are experimentally verified on 12-V input, 19-V output, 50-W boost converter prototype. applicability proposed demonstrated 400-W, 400-V output Boost factor preregulator.