Method for estimating power of a power converter

摘要

A controller for estimating a power of a power converter and method of estimating the same has been introduced herein. In one embodiment, the controller includes an analog/digital converter configured to provide samples of a rectified voltage waveform corresponding to a rectified sensed voltage of the power converter. The controller also includes a processor configured to estimate a minimum value of the rectified voltage waveform in accordance with the samples and remove an offset from the rectified voltage waveform to obtain an unbiased rectified voltage waveform in accordance with the estimate of the minimum value. The controller is also configured to obtain an unbiased rectified current waveform corresponding to sensed current of the power converter and provide an average power of the power converter.

主权项

1. A controller, comprising:
an analog/digital converter configured to provide samples of a first rectified voltage waveform and a second rectified voltage waveform; and a processor configured to:
estimate a first minimum value of said first rectified voltage waveform and a second minimum value of said second rectified voltage waveform in accordance with said samples;remove a first offset from said first rectified voltage waveform and a second offset from said second rectified voltage waveform to obtain a first unbiased rectified voltage waveform in accordance with said estimate of said first minimum value and a second unbiased rectified voltage waveform in accordance with said estimate of said second minimum value;apply a scaling factor to said second unbiased rectified voltage waveform to determine an unbiased rectified current waveform;multiply said first unbiased rectified voltage waveform and said unbiased rectified current waveform to determine an instantaneous power; andprovide an average of said instantaneous power to determine an average power.