Угол отсечки

Угол отсечки ( $\vartheta$ , рад) — величина, равная произведению угловой частоты входного напряжения электронного прибора на промежуток времени, в течение которого ток изменяется от максимального значения до нуля. Частное определение: угол отсечки — половина фазового угла, в течение которого электронный прибор открыт, то есть через него протекает ненулевой ток.

Угол отсечки можно определить из соотношения $U_{0}+U_{m}\cos \vartheta =U_{\text{н}}$ ^[1], где $U_{0}$ — постоянная составляющая, $U_{m}$ — амплитуда входного напряжения электронного прибора $u(t)=U_{0}+U_{m}\cos(\omega t)$ , $U_{\text{н}}$ — напряжение отсечки. Откуда $\vartheta =\arccos((U_{\text{н}}-U_{0})/U_{m}).$

Экспериментально угол отсечки можно получить, измеряя ток, протекающий через электронный прибор.

\vartheta ={\frac {\omega \Delta t}{2}},

где $\omega$ — угловая частота входного напряжения, $\Delta t$ — время, в течение которого электронный прибор открыт.

См. также

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Примечания

↑ Баскаков С.И. Радиотехнические цепи и сигналы. — 3-е издание, испр. и доп. — М.: Высшая школа, 2000. — С. 280. — 462 с.

Литература

Баскаков С.И. Радиотехнические цепи и сигналы: учебник. — 4-е, испр. и доп. — М.: ЛЕНАНД, 2016. — С. 51. — 528 с. — ISBN 978-5-9710-2464-4.

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