Automatic calibration method for DC-DC power converter with sensorless adaptive voltage positioning controller

An automatic calibration method for a previously proposed sensorless adaptive voltage positioning (SLAVP) controller is presented in this article. The SLAVP scheme achieves AVP control without the need for current sensing and sampling required by conventional AVP schemes. However, the accuracy of the SLAVP control scheme is sensitive to the power path equivalent DC resistance value,
R
eq

. An automatic calibration method is developed in this article in order to calibrate the SLAVP control law when
R
eq

varies as a result of components aging or component replacement after initial design, for examples. The theoretical basis of the automatic calibration method is presented along with proof-of-concept experimental results for verification.

Keywords: automatic calibration, duty cycle, power electronics, sensorless adaptive voltage positioning, switching converter, voltage positioning