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en:netzer:dimmer [2014/01/04 18:30] svesch |
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| + | ====== 230 V Dimmer ====== | ||
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| + | <note important>For this functionality the **[[io_project|IO project]]** (base or pro) has to be [[fwupdates|uploaded]] to Netzer.</note> | ||
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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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| + | <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. | ||
