Electronics > Beginners
How to set reference for a sine wave with dc supply
C:
-Voltage drop across TRIAC = ____?
anishkgt:
Haven't found a TRAIC of suitable rating. Getting a feeling that this idea would be close to impossible.
C:
--- Quote from: anishkgt on July 01, 2018, 09:28:26 pm ---Haven't found a TRAIC of suitable rating. Getting a feeling that this idea would be close to impossible.
--- End quote ---
You are starting to get the picture.
3.2 vac is not much to start a high current needed to spot weld.
As current increases the connecting wire is actually limiting max current.
The lower the starting voltage the cleaner the parts need to be to get the current started.
anishkgt:
--- Quote ---You are starting to get the picture.
--- End quote ---
3.2 vac ? what measurement is that ?
--- Quote ---The lower the starting voltage the cleaner the parts need to be to get the current started.
--- End quote ---
which voltage and to start what current ?
C:
--- Quote from: anishkgt on July 01, 2018, 05:38:02 pm ---Thank you, appreciate the time you took to write this.
--- Quote ---you could connect one input to a line power voltage divider to adjust turn-on. The AC voltage sense would then be between voltage divider and junction of R2 & primary winding.
--- End quote ---
Input as in pin 2 ? but what is the poin in connect mains power to the input ? Just to make sure we are in the same page, the schematic is meant to be put in series with the secondary.
--- Quote ---Need to keep in mind that when secondary is shorted, you could have full line voltage across R2 so the wattage rating of R2 needs to handle this.
--- End quote ---
What about the zener diode D1 does wattage matter ? The max amps the transformer can put out is 800A but will not be driving to that much. The secondary open voltage is 3.2vac. So a 3.6v @500mW zener and 3W resistor as R1 would be ok ? attached updated schematic with a triac
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A spot weld is process of producing a lot of local heat.
To produce heat you need power. To produce a good spot weld you need a lot of power concentrated in a small area.
You need to heat the small area faster then you heat the larger area.
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