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en:netzer:dimmer [2011/12/19 12:23] 127.0.0.1 external edit |
en:netzer:dimmer [2011/12/19 12:47] svesch Fixed image links. |
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| ====== 230 V Dimmer ====== | ====== 230 V Dimmer ====== | ||
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| <WRAP center round important 60%> | <WRAP center round important 60%> | ||
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| **Be careful when experimenting with 230 V. There is danger to life!** | **Be careful when experimenting with 230 V. There is danger to life!** | ||
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| </WRAP> | </WRAP> | ||
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| From **version 1.4 pro**, direct addressing of a reverse phase dimmer is supported by Netzer. | From **version 1.4 pro**, direct addressing of a reverse phase dimmer is supported by Netzer. | ||
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| A reverse 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. | A reverse 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& |}} | {{ :phase_control.jpg?nolink& |}} | ||
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| The switching mechanism basically consists of zero-crossing detectors and a dimmer circuit. | The switching mechanism basically consists of zero-crossing detectors and a dimmer circuit. | ||
| - | {{ :de:netzer:phasecontrol.gif?nolink& | Block diagram reverse phase dimmer}} | + | |
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| + | {{ :en:netzer:phasecontrol.gif?nolink& | Block diagram reverse phase dimmer}} | ||
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| ===== Zero-crossing detector ===== | ===== 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: | 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: | ||
| - | {{ :de:netzer:phasecontrolio0.gif?nolink& | IO0 setting}} | ||
| - | 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. | + | |
| + | {{ :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 ===== | ===== 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. | 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. | ||
| - | {{ :de:netzer:phasecontrolpulsee.gif?nolink& | Pulse setting}} | ||
| - | 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 [[de:netzer:io#impuls|pulse operation]] and 50000 possible. Vlaues 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. | + | |
| + | {{ :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. Vlaues 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. | ||
