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high voltage analog optocoupler
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hussamaldean:
Hi all
I am looking for an analog optocoupler for arduino project which is flyback boost converter which shall boost the input voltage from 12V to about 200V. however, dealing with such high voltage is dangerous and may burn my arduino if voltage divider is used.
I looked using google but I couldn't come with some useful
is there any type of those thing ?
not very high bandwidth though up to 50KHz is more than enough
Zero999:
200V is not a high voltage.

Most opto-couplers have an isolation voltage in the kV range.

Why do you think it has to have bandwidth of 50kHz? The opto-coupler feedback path should have a much lower bandwidth, than the switching frequency.

Please post a schematic.
T3sl4co1l:
Which one is it, flyback or boost?  Flyback is transformer coupled, and an opto is required to get feedback.  (No unusual voltage ratings are necessary.)  Boost is common ground, and does not need an opto.

If you are worried about resistor breakdown, use a few in series.  200V is acceptable for most 1/4W carbon film resistors, but smaller types (including 1206 and smaller SMT chip resistors) should use two or three in series.

Tim
hussamaldean:

--- Quote from: Zero999 on January 25, 2019, 12:41:28 pm ---200V is not a high voltage.

Most opto-couplers have an isolation voltage in the kV range.

Why do you think it has to have bandwidth of 50kHz? The opto-coupler feedback path should have a much lower bandwidth, than the switching frequency.

Please post a schematic.

--- End quote ---
the schematic in the attachment
the optocoupler will be used as feedback between the output of the DC value and arduino to control the duty cycle of the mosfet/igbt


--- Quote from: T3sl4co1l on January 25, 2019, 02:29:49 pm ---Which one is it, flyback or boost?  Flyback is transformer coupled, and an opto is required to get feedback.  (No unusual voltage ratings are necessary.)  Boost is common ground, and does not need an opto.

If you are worried about resistor breakdown, use a few in series.  200V is acceptable for most 1/4W carbon film resistors, but smaller types (including 1206 and smaller SMT chip resistors) should use two or three in series.

Tim

--- End quote ---
you can find the schematic in the attachment
Wolfgang:
Horowitz and Hill Art of Electronics Book Release 2 has a complete switcher including optocoupler feedback, if you are interested.
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