| Electronics > Projects, Designs, and Technical Stuff |
| passing signals over galvanic isolation without an opto coupler |
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| Simon:
I am working around an application where PWM signals need passing through a galvanic isolation barrier. Opto couplers seem to have piss poor leakage at higher temperatures and the manufacturers short of lying won't put all the specs on the data sheet. A Vishay manufactured CNY17 that is rated for an ambient of 100C only has specifics given up to 75C. Is there another way? Various data protocols have dedicated isolated parts but I need something that is generic enough for PWM. |
| CJay:
Might be possible to use a pulse transformer if you don't need 0-100% duty cycle |
| Simon:
Um, well we don't usually use 0 or 100%. We usually go from 10% to 90% to distinguish between a desired drive an a lack of signal. How well do these work in general digital electronics passing 5V PWM at a few hundred Hz to a kHz? |
| mikeselectricstuff:
There are plenty of magnetic isolator products out there ( NVE and Analog Devices come to mind) |
| Simon:
--- Quote from: mikeselectricstuff on October 17, 2019, 08:27:31 am ---There are plenty of magnetic isolator products out there ( NVE and Analog Devices come to mind) --- End quote --- Are they all called pulse transformers? Basically what sort of search terms lead to what I am looking for, what do people call these things? |
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