Timeline for Need a switching device. Should it be a relay?
Current License: CC BY-SA 3.0
7 events
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| Jun 18, 2015 at 18:43 | comment | added | WhatRoughBeast | Making a SPDT SSR is simplicity. You just use 2 SPSTs, and drive the inputs separately. In your case you would use separate "charge" and "load" controls. You want to do this anyways, since many DC SSRs are quite slow, and you don't want to turn one on and the other off simultaneously, since you can get milliseconds of shoot-thru. | |
| Jun 18, 2015 at 18:40 | comment | added | WhatRoughBeast | You're looking in the wrong places. Try Digikey, Mouser, Allied Electronics, Arrow, Future, etc. If you absolutely must, you can try eBay, searching for "solid state relay DC output 40A" - but you'll get Chinese stuff of unknown parentage, buyer beware. For instance, ebay.com/itm/… will do you, as long as you trust it. Also, be aware that you'll need a decent heat sink - cheap SSRs can have a 1 volt drop, so you might get 40-50 watts. | |
| Jun 18, 2015 at 16:45 | comment | added | yiipmann | Also SSR SPDT relays are very rarely available online (also with a very low load current rating). Mostly SSR are available in SPST. So does that mean i will have to look for contactors ? Or i can find SSR SPDT rated at my requirement ? As you said above and i also found out online that one has to design driver circuitry for contactor/electromechanical relays whaen driven by MCU, so i think my preference would be to find a suitable SPDT SSR. Can you help me finding one please ? | |
| Jun 18, 2015 at 16:18 | comment | added | yiipmann | So does that mean i should look for a DC SPDT solid state relay with vdc >= 12VDC and Load current >= 50A ? Because i have been looking for quite some time and still i haven't found any device with such current rating. Most of them i am coming across are rated at load current <= 2A. | |
| Jun 18, 2015 at 14:59 | comment | added | WhatRoughBeast | Oops. Sorry. You are correct, and I forgot aaaall about the discharge requirement. SPDT it is. | |
| Jun 18, 2015 at 12:14 | comment | added | yiipmann | You said that i will be needing a single pole single throw relay. But after going through it i came to the conclusion that may be i will be needing a single pole double throw relay. As i want to SWITCH BETWEEN my power supply and the load, rather than just connecting or disconnecting some single device. And after going through SPDT relays i think they would be my choice. What do you say about it ? Am i right ? Also shown in this image | |
| Jun 16, 2015 at 15:05 | history | answered | WhatRoughBeast | CC BY-SA 3.0 |
