Hey all,
It has been a while since I've posted here but I haven't seen this in the forums yet.
I'm working on my senior design project and one part of our system involves individually controlling each plug in a standard power outlet (120VAC 20A). We were initially looking at a SPST electromechanical or solid state relay, leaning towards solid state if we could find one rated at the right amperage for the right price. After a few hours on Digikey, I'm guessing the industry standard is 16A and we should just say our project is rated at 15A. Is that what most products are rated at? I haven't been able to see anything mentioned on things like surge protectors.
Since the goal of our main project is to encourage energy efficiency, we are trying to be as low-power as possible. We think a latching relay would be the best way to go so you aren't burning power in either state. Problem is, I haven't been able to find any off the shelf latching relays rated for 120VAC and at least 16A.
I've been looking around at some circuits and thinking we may want to make our own discrete latching solid state relay. I think I have a good grasp on how a non-latching ssr circuit works, but I'm still a little confused about how we would implement a latching one. We hope to switch 120VAC at 20V with as little power possible from the controller. We have a few optocouplers on hand, and are thinking about picking up some of these SCRs and will be using an 8051 as our controller.
Do you think a latching solid state relay is the right solution? And could you help explain how to implement the latching circuit or point me to a good reference? Also, I may just not be talking nice to Digikey today and there really is an off the shelf solution that fits our bill perfectly.
We would greatly appreciate any help! We are all a tad bit embarrassed at how rusty we have gotten since our intro circuits classes...
Thanks a ton,
washer
It has been a while since I've posted here but I haven't seen this in the forums yet.
I'm working on my senior design project and one part of our system involves individually controlling each plug in a standard power outlet (120VAC 20A). We were initially looking at a SPST electromechanical or solid state relay, leaning towards solid state if we could find one rated at the right amperage for the right price. After a few hours on Digikey, I'm guessing the industry standard is 16A and we should just say our project is rated at 15A. Is that what most products are rated at? I haven't been able to see anything mentioned on things like surge protectors.
Since the goal of our main project is to encourage energy efficiency, we are trying to be as low-power as possible. We think a latching relay would be the best way to go so you aren't burning power in either state. Problem is, I haven't been able to find any off the shelf latching relays rated for 120VAC and at least 16A.
I've been looking around at some circuits and thinking we may want to make our own discrete latching solid state relay. I think I have a good grasp on how a non-latching ssr circuit works, but I'm still a little confused about how we would implement a latching one. We hope to switch 120VAC at 20V with as little power possible from the controller. We have a few optocouplers on hand, and are thinking about picking up some of these SCRs and will be using an 8051 as our controller.
Do you think a latching solid state relay is the right solution? And could you help explain how to implement the latching circuit or point me to a good reference? Also, I may just not be talking nice to Digikey today and there really is an off the shelf solution that fits our bill perfectly.
We would greatly appreciate any help! We are all a tad bit embarrassed at how rusty we have gotten since our intro circuits classes...
Thanks a ton,
washer