Friday, 16 February 2018

How to calculate resistor and capacitor size for snubber circuits



I have a 24 VAC Contactor that I want to drive with a microcontroller through a photmos. How do I calculate the proper size resistor and capacitor for a snubber circuit? Here are some of the specifics. Thank you for your help!


Microcontroller - 5V DC 40 mA max on the output pin.


AQV252G Photomos http://www.futureelectronics.com/en/technologies/electromechanical/relays/solid-state-relays/Pages/9530346-AQV252G.aspx?IM=0


Transformer Data - 24 VAC 40 VA Transformer


Contactor Data


Contactor Nominal Coil Voltage 24


Maximum Pickup Volts 18


Drop-Out Volts Range 6 - 15


Nominal Inrush VA @ 60 Hz 20


Nominal Sealed VA @ 60 Hz 5.25



Nominal DC Resistance - Ohms ± 10% 16.5




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