Pulse Generator Theory
- Thread starter Amryan
- Start date
Hi Amryan,
What you are meaning & What you exactly want to do?
I can help you but you should be more clear please. There are several different ways/Methds to generate Pulses with variable Frequency an output level. But if explain your goal I can offer the suited ones.
What you are meaning & What you exactly want to do?
I can help you but you should be more clear please. There are several different ways/Methds to generate Pulses with variable Frequency an output level. But if explain your goal I can offer the suited ones.
Hi eman12,
So my professor gave me a project about transferring a voltage pulse through a 10kV cable using a contactless capacitive coupling sensor... He want me to build an AC 50-100v output pulse generator that can control the pulse width and the time rise and fall time. I have zero knowledge about pulse generator.
Cheers,
Why not study some pulse generators?
http://w140.com/tekwiki/wiki/108
http://w140.com/tekwiki/wiki/109
http://w140.com/tekwiki/wiki/2101
http://w140.com/tekwiki/wiki/284
http://w140.com/tekwiki/wiki/R293
Square wave generator:
http://w140.com/tekwiki/wiki/105
http://w140.com/tekwiki/wiki/106
And that's just Tek! Also look for HP schematics.
http://w140.com/tekwiki/wiki/108
http://w140.com/tekwiki/wiki/109
http://w140.com/tekwiki/wiki/2101
http://w140.com/tekwiki/wiki/284
http://w140.com/tekwiki/wiki/R293
Square wave generator:
http://w140.com/tekwiki/wiki/105
http://w140.com/tekwiki/wiki/106
And that's just Tek! Also look for HP schematics.
I do want to study.. Thats why I want to know the basic theory, also the equivalent circuit, and which one should we replace if we want contol the pulse width or something...
When you say "AC 50-100v output pulse generator " I assume you need an oscilator, So what about using a function generator or an PWM chip?
Something like TL494?
So I think it's not continues because, I'm gonna use Time domain reflectometry to analyse the cable. I think I have to assume that it's only use single or double signal only. and is it unsafe?? can you be more elaborate why is it unsafe?
You can definitely feel a 50-100V pulse, even if it's just one brief pulse. Under the right conditions it could be dangerous.
A supply capable of delivering that pulse is also dangerous. Creating the pulse by using a transformer to step up a smaller pulse is safer than a continuous 100V supply.
Thank you for explaining. There is another question, what are the conditions that might be dangerous. Because this pulse generator will be implemented on an overhead high voltage transmission line with 1 meter distance between the cable and the device
So I think it's not continues because, I'm gonna use Time domain reflectometry to analyse the cable. I think I have to assume that it's only use single or double signal only. and is it unsafe?? can you be more elaborate why is it unsafe
is there any ways to help me??
When there is any direct human contact. A zapped finger is a mild hazard (because you might jerk your arm into your coffee pot, cutting your arm and scalding your legs with hot coffee). A zap across fingers on opposite arms is a bit higher risk, since the current passes through the body and across the chest. Holding a good large conductor with sweaty hands would increase this current far more. Having the conductor in your mouth could send current through your skull and maybe even kill you.
My point is, the risk is small if reasonable safety precautions are taken. But under conditions that are unlikely not impossible, 100VDC could be fatal. Use insulation, isolation from intruders, fusing, warning signs, whatever you can think of. Imagine a having a dog or a 2-year old running around your equipment - how would you protect them from sticking a live wire in their mouth? A moments thought and attention to safety should eliminate the majority of the risks.
that's reasonable.... That's why I'm not sure about how much the Voltage amplitude and the pulse width... Because I need to simulates in ansys whether the pulse will successfully transmitted or not. That's why I need the schematics so I can try it first
So... is there anyone would help me???
Seems like someone posted 5 complete schematics for pulse generators... They probably need some modification to supply 100v DC and to update obsolete parts, but with you're recently acquired education the mods shouldn't be too hard.
This is not "do your homework for you forum"
This is not "do your homework for you forum"
Yes... I know there are complete schematics, but i want to know the basic circuit and how they works so I will know which part should I change. And FYI, it's 50-100 AC input not DC...
Every single one of the tektronix documents of that era has a complete theory of operation that details the function of nearly every part, as well as includes a detailed parts list. If you have specific questions, or can't work out the math, then ask questions, but don't expect us to be able to give you the 'answer' or a schematic that meets all of your requirements. You're the EE - or about to be... go do some research!!!
There are MANY ways to make a 100Vac or dc pulse generator... my solution is just one of those solutions... eman offered a different solution... you could use a commercial pulse generator and amplify the pulse, you could use a 555 chip to create the pulse and amplify it... the list could go on and on.
There are MANY ways to make a 100Vac or dc pulse generator... my solution is just one of those solutions... eman offered a different solution... you could use a commercial pulse generator and amplify the pulse, you could use a 555 chip to create the pulse and amplify it... the list could go on and on.
Thank you for your guidance and explanation...
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