Current sensorless control of a boost-type switch mode rectifier (SMR) with inductor parameter adaptation

摘要

Boost-type switch-mode rectifiers (SMR) commonly use a resistor or a magnetic current sensor to measure the instantaneous input or inductor current that is used as the feedback to the current controller. A novel current sensorless scheme is described that computes the inductor current from the measured inductor voltage in a single-phase boost-type SMR using an adaptive low pass filter. This calculation requires an estimate of the inductance and the equivalent series resistance of the inductor coil. Both these parameters are dependent on operating conditions and are updated continuously. This is done using an adaptive model of the inductor that computes these parameters of the inductor once in every half cycle of the input current. The adaptation scheme is robust against parameter variations. Simulation and experimental results confirm the effectiveness of the proposed technique which provides comparable performance to standard measured feedback current scheme both under steady-state and transient conditions.

主权项

1. A digital power supply controller, comprising:
a logic device, having computer executable instructions defined therein for performing a method comprising: receiving a measurement corresponding to a switch voltage associated with a switch device and a measurement of a rectified input voltage, and based on the switch voltage and the rectified input voltage, estimating a resistance and inductance of a boost inductor; estimating a current in the inductance based on the estimated resistance and inductance; determining a control signal for the switch device based on the estimated current; estimating a magnitude of a periodic boost inductor current based on an output voltage ripple; estimating the resistance and the inductance of the boost inductor based on the estimated magnitude of the periodic boost inductor current, wherein the resistance and inductance of the boost inductor are estimated based on integration of the relationvLest=RLest⁢iLest+Lest⁢ⅆiLestⅆtover at least two different time intervals, wherein vLest, RLest, iLest, Lest are the estimated boost inductor voltage, the estimated boost inductor resistance, the estimated boost inductor current, and the estimated boost inductor inductance, respectively; and
estimating the inductance of the boost inductor based on a difference between the measurement corresponding to the switch voltage associated with the switch device and the measurement of the rectified input voltage.