Electronic circuit for measuring electrical energy
Номер патента: CA1246147A
Опубликовано: 06-12-1988
Автор(ы): Raymond W. Mackenzie
Принадлежит: Westinghouse Electric Corp
Опубликовано: 06-12-1988
Автор(ы): Raymond W. Mackenzie
Принадлежит: Westinghouse Electric Corp
Реферат: 21 50,874 ABSTRACT OF THE INVENTION A shift register is utilized to provide a 90° delay in a pulse width modulated current signal, to deter-mine volt-amperes reactive. The shift register is asso-ciated with a clock that provides a preselected frequency that, in combination with the number of stages in the shift register, delays the pulse width modulated current signal by an amount equivalent to one-quarter period of the current waveform in the metered circuit. After delaying the pulse width modulated signal by 90°, the shifted signal is multiplied by a voltage signal that represents the voltage in the metered circuit and the resulting product signal is input to a voltage-to-frequency converter.
Method and apparatus for measuring of electrical power and use thereof
Номер патента: WO1997042511A1. Автор: Bengt Alvsten,Jorn Blinkenberg Willadsen,Hans Møller ANDERSEN. Владелец: Centec Trade & Technology A/S. Дата публикации: 1997-11-13.