Hysteresis and Delta Modulation Control of Converters Using Sensorless Current Mode

Jonathan W. Kimball, Missouri University of Science and Technology
Philip T. Krein
Yongxiang Chen

This document has been relocated to http://scholarsmine.mst.edu/ele_comeng_facwork/727

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Sensorless current mode (SCM) is a control formulation for dc-dc converters that results in voltage-source characteristics, excellent open-loop tracking, and near-ideal source rejection. Hysteresis and delta modulation are well-known, easy-to-construct large-signal methods for switched systems. Combining either large-signal method with SCM creates a controller that is simpler and more robust than a pulse-width modulation (PWM) based controller. The small-signal advantages of PWM-based SCM are retained and expanded to include converter response to large-signal disturbances. These approaches can be used with any converter topology over a broad range of operating conditions. In the present work, hysteresis and delta modulation SCM controllers are derived and simulated. Extensive experimental results demonstrate the large-signal behavior of both control schemes.