Relays have occupied my recent free time.
After seeing how slow it is for 1 relay to control another and maybe even a 3rd relay, I had to do something.
In my online wanderings I found that in the case of NO, DC-coil relays that carry significant voltage or current, the opening is more of a priority than the closing. The tendency for contacts to micro tac-weld plus, the electro-magnetic force of the coil itself prolongs the break time. Placing a diode across the coil is the slowest method to collapse the coil’s energy field.
TE Connectivity published several Application Notes concerning relays that I found very helpful. These Notes are not product specific and address the issue of accelerating relay opening times in general terms w/ diagrams.
www.te.com
These Application Notes list the common methods to collapse coil fields with their release times and circuit diagrams.
The 2nd fastest method requires the addition of a Zener in-series with a diode connected Anode to Anode or K to K, across the coil.
neil, NYC
After seeing how slow it is for 1 relay to control another and maybe even a 3rd relay, I had to do something.
In my online wanderings I found that in the case of NO, DC-coil relays that carry significant voltage or current, the opening is more of a priority than the closing. The tendency for contacts to micro tac-weld plus, the electro-magnetic force of the coil itself prolongs the break time. Placing a diode across the coil is the slowest method to collapse the coil’s energy field.
TE Connectivity published several Application Notes concerning relays that I found very helpful. These Notes are not product specific and address the issue of accelerating relay opening times in general terms w/ diagrams.
Application Notes on Relays
Read a wide range of technical documentation and guidelines, from TE Connectivity engineers on how to specify, select, test, and maintain relays in a variety of applications.
These Application Notes list the common methods to collapse coil fields with their release times and circuit diagrams.
The 2nd fastest method requires the addition of a Zener in-series with a diode connected Anode to Anode or K to K, across the coil.
neil, NYC
