Many naive people who replace classic, transformer based AC power bricks by modern DC power supplies do that mistake. It’s being used beyond specification, thus, which might reduce lifetime depending on how heavy the load is. If that’s not the case, like with DC, one part of the bridge-rectifier stays unused while the other part gets overloaded (too much current). Because your logic falls apart once a bridge-rectifier comes into play.īridge-rectifiers require the load to switch multiple times per second, because that’s what they designed for. On the other hand, it’s better that way, maybe. It’s better for planned obsolescence, too. Yeah, as cheap as they are they probably don’t use an effective bridge-rectifier anymore, but a single diode. They will ha happily accept DC voltage input instead, and they don’t care about polarity. “The very first thing they do is rectify the incoming AC to DC.
“Fun fact: virtually all devices now use switching power supplies.”įun fact: Not in my house. He eventually pointed to one contractor and said “there…that one sticks sometimes “ and fixed it by whacking it with a ruler length wooden stick he apparently kept in the cabinet for just that purpose. I was completely fascinated that the DC arcs were very different than the louder, crackly jagged arcs you see with AC. When the high current contractor points opened, despite being quite a distance across the points, they made big long hissing/whooshing tubular arcs that took a few seconds to finally extinguish. The old timer in charge who I had been talking to invited me to watch while he opened a locked panel to reveal a big bank of relays and open frame contactors that controlled it. This one was malfunctioning a bit being such antiques. This was before solid state inverters so everything was entirely DC due to the batteries. They charged a large bank of batteries so that it would continue to work during station stops and delays. Built to operate behind steam engines (still in use in their era) they delivered modern passenger comforts like lighting and air conditioning by using a wheel movement powered generator. As a teen in the 80’s, I got to ride on an excursion train featuring late 1950’s passenger cars. Side comment about breaking loads under DC vs AC. Posted in High Voltage Tagged automatic, electricity, medical device, power, relay, reliability, transfer switch Post navigation You can instead use an interlock plate which is even simpler than that.
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If you plan to perform the related task of connecting a generator to your home, you might not need a transfer switch at all, though.
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In ’s case it was a relay that had the right current ratings to switch his PC and Internet modem/router, and in ’s case it was finding a relay that could perform the transfer fast enough, and both were able to do it for as inexpensively (or more) than anything they could find in a store. One of the perks of building your own tools and equipment like this is getting exactly the right parts for the job.
’s design was fast enough that this didn’t happen, saving the hassle and expense of trying to find one that would work as well. Commerical offerings were too slow, and during the power transfer process the equipment would power off and need to be reset. lives in a place currently experiencing rolling blackouts, and needed something to reliably power a piece of medical equipment through the night. This might not seem like too big of a deal, but another person,, came across this build and had a different use case for it. was able to get a higher quality product by building it himself rather than spending a comparable amount of money on a cheap off-the-shelf product as well. The relay coil is energized by the primary power supply, and when that power is lost the relay automatically changes over to the other power supply, which might be something like a battery backup system. A dual-pole, dual-throw relay is housed inside of an electrical junction box with two electrical plugs, each of which can be connected to a different circuit or power source in ’s house. But there are other reasons to use transfer switches as well as shows us with this automatic transfer switch meant to keep his computers and Internet powered up. These are necessary safety devices too they keep power lines from being back-fed by the generators. An option for those living in these situations is a backup generator, often turned on and connected by an automatic transfer switch. Living in a place where the electric service isn’t particularly reliable can be frustrating, whether that’s because of a lack of infrastructure, frequent storms, or rolling blackouts.
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