Sensorless current sensing methods for power electronic converters

摘要

In one example embodiment, an apparatus includes a power electronics switching circuit having a semiconductor switch and a device in communication with the power electronics switching circuit. The device includes a processor configured to estimate a current through the power electronics switching circuit based on a first voltage across the semiconductor switch, a control signal controlling the semiconductor switch and a first voltage-current characteristic of the semiconductor switch.

主权项

1. An apparatus comprising:
a power electronics switching circuit having a semiconductor switch; and a device in communication with the power electronics switching circuit, the device including a processor configured to,
measure a first voltage across the semiconductor switch,estimate a semiconductor switch-specific current through the semiconductor switch based on the measured first voltage, a control signal controlling the semiconductor switch and a first voltage-current characteristic of the semiconductor switch,determine a second voltage across a diode of the power electronics switching circuit based on the estimated semiconductor switch-specific current, the control signal and a second voltage-current characteristic of the diode,estimate a diode-specific current through the second component based on the determined second voltage and the second voltage-current characteristic, andestimate a current through the power electronics switching circuit based on the estimated semiconductor switch-specific current and the estimated diode-specific current.