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Engineering
Electrical Engineering
Novice question about Relays, Capacitors, and Diodes
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[QUOTE="shushi, post: 6209322, member: 664645"] [B]TL;DR Summary:[/B] How to determine specific capacitors and diodes in order to minimize back emfs and arcing of opening contacts. Hello, In regards to this relay, TQ2SA-1.5V Panasonic 2 Form C AS Single side stable, 1.5VDC 2A DPDT NON-LATCHING SMD Relay https://www.mouser.com/ProductDetail/769-TQ2SA-1.5V [URL='https://www.mouser.com/datasheet/2/315/mech_eng_tqsmd-1304769.pdf']PDF 1 of Relay[/URL] PDF 2 of Relay (specifically pages 5-6) is attached at the bottom as a pdf file. [ATTACH type="full"]246939[/ATTACH] I was previously told that I would need to wire a IN4001 diode which have a 50VDC blocking capacity, in parallel to the coil pins of this relay which could produce a back emf surge of up to 50VDC, which was more than enough to protect this specific circuit. https://www.engineersgarage.com/electronic-components/1n4001-diode [URL='https://www.engineersgarage.com/sites/default/files/1N4001.pdf']PDF of 1N4001-Diode[/URL] I know basic electronics and ohms law theory, but I'm still a bit of a novice to when it comes with electronics, but is this true? Is a IN4001 diode more than enough to protect this circuit? In the PDF, it says this about the coil and contact electrical characteristics, but I'm not sure how to translate this as useful data when looking at the capacities of the IN4001 diode.I was also told that I needed to protect the contact ends of the relay since when they open up, they tend to create an arc that can wear out and damage the relay's performance. I was reading on another forum that in order to minimize this damage that I needed to wire a capacitor and a resistor in parallel to those contact ends, which they provided a "No Math" approach to figuring out the capacity and type of capacitors and resistors that I needed, which was the following method, for the farad value of the capacitor, and for the voltage of the capacitor, and for the resistance value of the Resistor, Based on my schematics, are 0.04µF 300VDC capacitor + 5 Ohm 5 Watt resistor approprate for a circuit that has total of 22mA and 5VDC, and a 0.02µF 300VDC capacitor + 5 Ohm 5 Watt resistor for a circuit that has total of 40mA and 5VDC? Sorry for asking a beginner's question, but I'm still trying to learn more about circuitry and electrical engineering. Thank you for your time! [/QUOTE]
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Novice question about Relays, Capacitors, and Diodes
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