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| Digital oscilloscope project/kit |
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| RobWilson:
:lol: Hog roast would fit in the van Dave :lol: I will look into it , are you going mate ? Rob |
| Bluechip:
If you know the current the welder takes and for how long it takes it a first approximation would be: Say ... 50A for 0.2 seconds ... I x T = 1/2 ( C x V2 ) So: Assume 50A for 0.2 seconds and an applied voltage of 35V C = ( 2 ( I x T )) / V2 Which I make about 16 and a bit mF or 16,500 uF This does assume the cap. voltage stays at 35V all the time which it won't ... :( No real idea what current a spot welder takes or for how long? Don't they have some sort of timer to gate the current ?? Another easy job for a PIC ... :beer: Dave |
| Bluechip:
--- Quote from: RobWilson on May 03, 2016, 04:19:53 PM --- :lol: Hog roast would fit in the van Dave :lol: I will look into it , are you going mate ? Rob --- End quote --- Yup, got my ticket ... Codgers Discount rate ... :thumbup: Saturday probably ... about 90% certain. D. |
| Bluechip:
Have you got a diagram of what you want to build ... ? Not having any real idea of how these things work, it seems to me to use a thyristor as the switching element as these turn off anyway when the current drops below the holding value and it wont switch on again until another gate pulse arrives ... :scratch: D. |
| PK:
--- Quote from: RobWilson on May 03, 2016, 03:01:26 PM ---Ok lads A question for the electronics chaps , I would like to build a circuit that would charge up a bank of capacitors to anywhere between say 10v to 35v and when charged to the set voltage disconnect the power supply from the capacitor bank . Any pointers ? :scratch: Rob --- End quote --- The details depend on things like how: how big the caps are, how fast you want to charge them, and what your input voltage to this circuit will be. But essentially you would use a current limited power supply set to the target voltage and a diode. Very simple for small (ie <=10A) currents. PK |
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