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Консультация № 109838
17.11.2007, 14:06
0.00 руб.
0
2
2
Здравствуйте. Заинтересовала формула 4а с сайта http://un7ppx.narod.ru/device1/power31.htm
Необходимое напряжение на нагрузке 5 В, допустимые пульсации не более 50 мВ, сопротивление нагрузки 5 Ом. fr будет равно в таком случае 0.01, F равно 50 Гц. Если подставить эти значения в эту формулу то будет 0,38. Кстати, чего? Фарад, что ли? Не много?
Есть еще формула
С=Iвых*dt/dU
здесь в чем измеряется C? А то если сюда еще подставить то будет 0.2 Ф. Тоже много.
Расчеты кстати делаются для небольшой контрольной работы, так что поменять схему не получится
В общем, скажите, правильно ли я все считаю в этих формулах.
Необходимое напряжение на нагрузке 5 В, допустимые пульсации не более 50 мВ, сопротивление нагрузки 5 Ом. fr будет равно в таком случае 0.01, F равно 50 Гц. Если подставить эти значения в эту формулу то будет 0,38. Кстати, чего? Фарад, что ли? Не много?
Есть еще формула
С=Iвых*dt/dU
здесь в чем измеряется C? А то если сюда еще подставить то будет 0.2 Ф. Тоже много.
Расчеты кстати делаются для небольшой контрольной работы, так что поменять схему не получится
В общем, скажите, правильно ли я все считаю в этих формулах.
Обсуждение
Неизвестный
18.11.2007, 02:44
общий
это ответ
Здравствуйте, Blackie!
Получается в фарадах. А что удивительного? Для контрольной сойдет, а в жизни все равно никто так не делает...
Получается в фарадах. А что удивительного? Для контрольной сойдет, а в жизни все равно никто так не делает...
Неизвестный
19.11.2007, 14:29
общий
это ответ
Здравствуйте, Blackie!
Все правильно, для выходного тока 1 А, чтобы обеспечить пульсации на выходе 50 мВ при уровне 5В получается емкость 0,2 Фарада.
На практике, при больших токах и малых пульсациях (для вашего случая это пульсации 1%) применяются сложные схемы компенсационных стабилизаторов с обратной связью.
Все правильно, для выходного тока 1 А, чтобы обеспечить пульсации на выходе 50 мВ при уровне 5В получается емкость 0,2 Фарада.
На практике, при больших токах и малых пульсациях (для вашего случая это пульсации 1%) применяются сложные схемы компенсационных стабилизаторов с обратной связью.
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