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en:netzer:dimmer [2012/01/25 20:56]
svesch Reworked preface
en:netzer:dimmer [2014/02/09 14:32]
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-====== 230 V Dimmer ====== 
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-The Netzer supports the direct connection of phase dimmers. So it is possible to control high voltage loads like bulbs via Ethernet resp. Intranet/​Internet. 
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-From **firmware version 1.4 pro**, this feature is supported by Netzer. ​ 
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-<WRAP center round important 60%> 
-**Be careful when experimenting with 230 V. There is danger to life!** 
-</​WRAP>​ 
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-A phase switching mechanism is described here that is for example built up by a thyristor. For this switching mechanism, the important feature of the thyristor is that in zero crossing it deletes from mains voltage itself, i.e. switches off. 
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-{{ :​phase_control.jpg?​nolink&​ |}} 
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-The switching mechanism basically consists of zero-crossing detectors and a dimmer circuit. 
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-{{ :​en:​netzer:​phasecontrol.gif?​nolink&​ | Block diagram phase dimmer}} 
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-===== Zero-crossing detector ===== 
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-IO0 is used as a zero-crossing detector for the 50\ Hz network frequency. For this purpose, the pin is required to be configured as a digital input with an edge trigger switched on: 
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-{{ :​en:​netzer:​phasecontrolio0.gif?​nolink&​ | IO0 setting}} 
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-Zero crossings must be captured by an external circuit, creating a homopolar pulse during every zero crossing. For this purpose, for example an AC optocoupler such as SFH620 is suitable. 
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-===== Dimmer circuit ===== 
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-A triggered pulse output of Netzer is dimmed. **IO3** or **SPI_INT** are both suitable for this. It is hence possible to operate up to two dimmers in parallel. ​ 
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-{{ :​en:​netzer:​phasecontrolpulsee.gif?​nolink&​ | Pulse setting}} 
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-This setting allows very granular gradations with a resolution of 200\ ns. Since under mains voltage a half cycle is 10\ ms and values between 100 (the is the smallest possible value in [[en:​netzer:​io#​impuls|pulse operation]] and 50000 possible. Values comply with the time according **to which** the thyristor is powered. I.e. the larger the value, the less power will run at the output. 
  

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