Will the bleed resistors enable a shorter path to ground or not?

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checkmatescott said:
after all that i found a solution for my needs!!! thanks for the answers, cheers
Scott

Your high side transistors will likely be damaged as they will have 38V (50V - 12V) to 50V across the gate and source. The absolute maximum is 20V. Even if they survive they will never turn off as they need less than 2V to do that.

You need to find some high side gate drivers for them. Many high side gate drivers are designed to drive N-Channel FETs. Make sure to either swap out the P-Chanel ones or get a driver that can drive them.

BoB
 
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will this not do, it specifys (in dc (max 60v)) also is there any way i can upload a video of the machine in motion
 
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checkmatescott said:
will this not do, it specifys (in dc (max 60v))
No, it will not do above about 15 volts input.
I would suggest you use a pair of half-bridge drivers, with four N-channel MOSFETs. N-chan are cheaper than P-chan, have lower on-resistance, and switch faster.

checkmatescott said:
is there any way i can upload a video of the machine in motion
We have a pretty good imagination. Why do we need video?
 
because its cool to see the black rubber wheel with the magnets on doing 600rpm you would be supprised, its a beast!
 
did a quick search of half bridge driver on youtube there doesnt seem to be anything is it called anything else perhaps thanks again
 
Youtube is not a good place for serious data sheets.
Google to find a datasheet for this; IR2103 Half-Bridge Driver.
 
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thanks is there any more light you can shed on getting the second half-bridge driver to work on conjunction
 
checkmatescott said:
is there any more light you can shed on getting the second half-bridge driver to work on conjunction
Use more than one pin on the controller.
 
ok very interesting so i just need one IR2103 Half-Bridge Driver. and use which pins to drive the drive the other two n-channel mosfets
 
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checkmatescott said:
so i just need one IR2103 Half-Bridge Driver. and use which pins to drive the drive the other two n-channel mosfets
No. You need two halves to make a whole bridge.
Study the datasheet to see how the boost voltage is generated, that controls the gate of the high-side switch.
 
IR2103P1 has more pins available is this correct chip to use?
 
The IR2103P1 can handle 600 volts, so it should also work with 60 volts.
 
thats really helpfull can you break it down for me how do i get an alternating current with fourIRF5210 n-chan mosfets by using the IR2103P1 chip and any resistors and wotnot
 
thanks and I how to hook it up to an arduino to create a rough sin wave at 50hz and duty cycle, Iwas more looking for a walk through explaining how to hook it up like which pin goes where and for my needs is that possible im very greatful that you are spending the time helping me so thank you
 
IR2103P1 how do you hook this chip up so that it makes both "sides" of the bridge tutorial style
 
Baluncore said:
You need two halves to make a whole bridge.
I feel we are getting somewhere can you give me a walkthrough style answer so that i have a useable circuit for my application which is controlling IR2103P1 chips via arduino at 50hz, alternating current, it can be modified square wave rough (preferably smooth) through PWM, and then explain how it works after
 
to be honest I kind of need spoon feeding a little bit to get me through this next part of my project
 
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You will need to take a couple of days to read and consider the datasheet and the application note. You must learn to think about and question your understanding of the device through the literature.

I don't know the answers to member's questions, but I know I can find the answers by searching and thinking. There is no shortcut to learning how to question yourself, you must learn to do it. Ask yourself the questions you are asking me. Ask yourself how I might find the answer, then do that yourself.

Program the microcontroller to change 4 pins. Each pin will control one MOSFET through a HB. Notice that some inputs to the HB driver pins are inverted. You will need a timer to set the 50 Hz frequency.

Once that is sorted, you can convert the driver control to produce more of a sinewave, but first produce the 50 Hz square wave.
 
can you point me to more literature or can i work this out from the data sheet and application note
 
You have sufficient info to last a couple of days. You must slow down and learn to think. If you need data, there is more on the other side of Google. Youtube is your enemy.

I have work to do, you are asking too many questions.
 
wont that half bridge work on its own because the the connections that go to the load oscillate making for the transformer primary winding excite and the all i have to do is put is put in square wave 50hz with the arduino
 
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checkmatescott said:
wont that half bridge work on its own because the the connections that go to the load oscillate making for the transformer primary winding excite and the all i have to do is put is put in square wave 50hz with the arduino
The lack of punctuation makes it hard to guess what you are suggesting.

If the primary of the transformer has a series capacitor, then you can use a half-bridge driven resonant converter topology. But that has a different transformer coupling and load circuit. Power can be increased again by using a full H-bridge with a resonant link.

I don't think you need power though, as the efficiency of a drone motor, friction-driving a generator, that runs an inverter, all to run an oven fan, will get quite warm. Losses in that chain will be greater than 50%, and you don't want it to melt the rubber.
 
Is there a way to upload a video? I'm working on my machine today. I understand you have imagination but its a different thing when you see it running there is no chance of the rubber melting, it's a flywheel. I will be looking through the Application Note AN-978 and the data sheet in more detail today. Bassically, all I want to achieve at the moment, is this part of my project. My machine creates a constant DC output, i want to convert this DC voltage to AC at 50hz. Dont worry to much about efficiency I understand that it seems pointless, but its what I want to do. The DC will be around 55volts and I want 55volts AC to then go into a transformer with a turn ratio of 1:4.182 so that on the output side of the transformer will be 230v AC out. Is it possible for you to help me out with a method of doing this. Any comment welcomed, cheers
Scott
 
I do not watch videos, it is a waste of time and of bandwidth.
 
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okay, so going back to yesterdays conversation i think the best option may be to use an arduino with 4 digital outputs to control some IR2103 chips (half-bridge's) with N-Channel MOSFETs in a manner that can be manipulated into giving me an alternating current where the 55v will be switched at 50hz thus arriving at the AC desired.
 
i would use a inverter from the web but they all seem to invert 12v and i need to invert 55v
 
checkmatescott said:
okay, so going back to yesterdays conversation i think the best option may be to use an arduino with 4 digital outputs to control some IR2103 chips (half-bridge's) with N-Channel MOSFETs in a manner that can be manipulated into giving me an alternating current where the 55v will be switched at 50hz thus arriving at the AC desired.
That was not a question, it was a statement of intent.
I do not disagree.

You do not need permission to stop procrastinating.
Just go ahead and do it.
 
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So I guess what i meant in my statment of intent was that I wanted a responce of something along the lines of "thats correct, this is how to wire it up....." can you give me a responce with something along those lines please? i just want to make sure I'm doing it right is there any software that you can recommend so that I might be able to simulate what I'm trying to do?