We disclose a new method for the joint detection of phase, frequency and amplitude of AC line voltage
that can outperform existing solutions in terms of detection precision and robustness to noise and
distortions on the AC line. This method is a fundamental building block in digitally controlled AC/AC
power converters, allowing them to operate with a tight adaptation to the input AC voltage, which in
turn brings more efficiency, more precise output control, and less conversion outages due to input AC
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INC, HP, "A ZERO CROSS DETECTION METHOD FOR AC POWER CONVERTERS BASED ON AN EXTENDED KALMAN FILTER", Technical Disclosure Commons, (January 24, 2020)