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virt2real.ru • Просмотр темы - wiki: PWM vs PPM
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wiki: PWM vs PPM

СообщениеДобавлено: 04 янв 2014, 14:01
eagafonov

Re: wiki: PWM vs PPM

СообщениеДобавлено: 04 янв 2014, 18:14
Mirmik

Re: wiki: PWM vs PPM

СообщениеДобавлено: 04 янв 2014, 19:28
eagafonov
Спасибо за ликбез :-)

Наличие двух статей на вики об одном и том же не отменяет!

В итоге, все согласны, что в 99% PWM == ШИМ. И нам с этим жить.
При рулении железкой и адаптации метода модуляции к конкрентой задаче надо включать мозг.

Re: wiki: PWM vs PPM

СообщениеДобавлено: 05 янв 2014, 14:42
Gol
PPM частный вид PWM. Тут выше про правильные аббревиатуры говорили но чтоб не путаться - в RC мире вроде как устоялась терминология. PPM - для серв и ESC бесколлекторников, вся обычная RC-шная аппаратура генерит как раз PPM. Ну, есть ещё PCM, но у разных производителей стандарты разные, а PPM таки общий стандарт, более-менее. По-этому я этими названиями и оперирую.

Принцип формирования один и тот же, да, только у PWM duty от 0 и до period (каким бы угодно это период не был), а у PPM - от 0 до 2200мкс, при периоде в 20000мкс. Т.е. для PPM главное уложить импульс с паузой в стандартные 20000мкс. А у PWM мы сами можем выбирать длительность периода исходя из требуемой частоты генерации импульсов (хотим чтоб мощные движки не пищали при вращении - ставим частоту ультразвука, 20кГц и выше), для прочей нагрузки можно и поменьше частоту.

Re: wiki: PWM vs PPM

СообщениеДобавлено: 05 янв 2014, 18:11
Mirmik
Тут суть в том, что название PPM пазмылось на 2 разных вида модуляции. Поэтому возникает путаница.