Post by thread:[SX] Controlling AC load with SCR

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Lightfoot wrote:Can you switch AC loads using a thyristor with an SX pin?

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, william wrote:No. Use a TRIAC ( BT137 ) and a small optocoupled solid relay ( MOC3011 ). That will do it.

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, g_daubach wrote:You may also use a solid state relay (DigiKey 425-1217-5-ND, for example). Such relays have zero-crossing detection, and some come with an integrated snubber circuit.

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote:The so-call 'Hockey Puck' Solid State Relay really offter optimal packaging with an easy interface. The heat generated by operating a solid state device is dumped from an all metal back. You can mount it to a metal chassis or an additional heat sink. The front side has easy to insulate connections. The only thing really missing is a fuse setup. The low voltage side often has a built in LED to indicate activity. They now come rated as high as 40amps at 240VAC. All that power can be controled from a BasicStamp oin. So, it is a bit silly to waste time on discrete component setups. If you really want to switch 5 or more AMPS, don't get the kind that mount to printed circuit boards as the board has some difficulty with carrying that high a current load. While the relay would be fine, the board may burn up!

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Lightfoot wrote:it would be cheaper to use discretes.

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Coriolis wrote:SCRs transmit in only one direction, so the output would be half-wave rectified. TRIACs transmit both directions and is likely what you want. In lighting applications, typically there is an additional control circuit which limits the turn on point to be a zero cross point of the AC line, this reduces EMF generation in the load line. The same holds true for non-lighting applications, but the control cicuit is most prevelant in lighting applications.

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Lightfoot wrote:Ah, So that's what the optocoupler is for.

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Lightfoot wrote:I was confusing thyristors with the EL train control systems (I live in Chicago), thats DC, so it would work.

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