Vladimir Ljaschko (24.02.2011 18:09, просмотров: 124) ответил Vladimir Ljaschko на А что джиттер? ШИМ нужна для синхронизации положения моторов. Никаких требований к джиттеру нет. Да и к частоте требования нет. Теоретически можно сделать плавающую частоту ШИМ, чтобы размазать по спектру пики. Понять бы, может ли это дать эффект.
Все придумано до нас. .... motor systems in which, in order to reduce electromagnetic interference (EMI) noise that is generated by controlling H-bridge field effect transistors (FETs), the frequency of a carrier signal (hereinafter referred to as http://www.patent-de.com/20071213/EP1850466.html
a carrier frequency) used in pulse-width modulation (PWM) control is changed with time are known. In such systems, since the carrier frequency is changed sinusoidally with time, spectrum components having noise at high levels generated at an nth harmonic frequency of a predetermined carrier frequency are spread over an nth-order frequency range (for example, n·5 kHz to n·20 kHz) of a frequency range (for example, 5kHz to 20kHz) in which the carrier frequency is changed with time. Thus, the levels of the noise generated at the nth harmonic frequency can be reduced. Accordingly, interference with radio reception and other electronic apparatuses can be reduced.