Device for detecting a load type

摘要

A method for detecting a load type is described. The method includes placing an electronic device in a forward phase mode. The method also includes operating a load at a maximum allowable level. The method additionally includes capturing a voltage waveform. The method further includes capturing a current waveform. The method also includes obtaining a voltage zero-cross based on the voltage waveform. The method additionally includes obtaining a current zero-cross based on the current waveform. The method further includes determining the load type based on the voltage zero-cross and the current zero-cross.

主权项

1. A method for detecting a load type, comprising:
placing an electronic device in a forward phase mode; operating a load at a maximum allowable level; capturing a voltage waveform; capturing a current waveform; obtaining a voltage zero-cross based on the voltage waveform; obtaining a current zero-cross based on the current waveform; determining whether the electronic device is in a switch leg mode when the voltage zero-cross equals the current zero-cross; and determining a load type based on the voltage zero-cross and the current zero-cross, wherein when the electronic device is in the switch leg mode, determining the load type comprises:
determining whether a slope of the current waveform at the voltage zero-cross is greater than a threshold, wherein if the slope is greater than the threshold, then the load type is inductive, and wherein if the slope is less than the threshold, then the load type is resistive.