help with IR2110 chips

[Maglatron]

Hello,

55 VDC will generate a sinus of about 39 VAC.
You need to apply the 0.707 factor to find the effective AC voltage.

Bertus

ok then would the 1:4.2 step up transformer still produce 230vac?

 

[Maglatron]

so 39 * 4.2 equals 156vac
156 * 0.707 give 110vac
correct? or not

 

[bertus]

Hello,

No, You will get the 156 VAC.
You already used the 0.707 on the 55 Volts.

Bertus

 

[Maglatron]

oh I see and is that the 156 rms? and peak still 230v please

 

[Maglatron]

MR Bertus

cool did you get what I meant when I said that the that the potential in the capacitors would collapse a moment after attaching the transformer to the circuit? because apart from the primary coil's resistance it's basically a short! what are your thoughts on this please?

also delta prime said something about the caps not depleting due to short because of the flux in the core,
so say I have my 55vac of which only 39vac is mainly used and I want rms 240vac what will be the transformer ratio please?

 

[Maglatron]

320 / 39 = 1:8.2 ratio for 230vac RMS?

 

[bertus]

Hello,

No, 230 / 39 = 5.8 : 1

Bertus

 

[Maglatron]

oh ok can you tell me why? might be being really stupid
can you explain step by step please?

Hello,

No, 230 / 39 = 5.8 : 1

Bertus

 

[Maglatron]

I think I've got it but just to clarify...

 

[Maglatron]

and also where can I buy one of the transformers at 5.8:1 ratio please?

 

[bertus]

Hello,

A transformer that goes from 230 Volts to 39 or 40 Volts will do.
Connecting it in reverse will work.

Bertus

 

[Maglatron]

yes I get that! can you recommend where to get one?? thanks having trouble finding one!

 

[Maglatron]

so I've found a 36:230 transformer could this be used?

 

[Maglatron]

nevermind found 40:230

 

[Maglatron]

Mr Bertus
so back to that question. if I connect the 55v to the inverter which has 50usec dead time and so it's basically on all the time and then put the output of the inverter throgh the transformer that I have, will the caps deplete very quickly because the coil on the primary has a low resistance and the voltage built up in the capacitor bank will collapse quickly coming to a resting voltage, because the primary is essentially a short? or is what Delta Prime said about the changing flux in the core of the transformer resist current and the voltage stays roughly the same? I hope you understand the question

 

[Maglatron]

taking pictures today

 

[bertus]

Hello,

You keep talking about a capacitor. What is the capacity and what is powering the capacitor?
A schematic would also help.

Bertus

 

[Maglatron]

there are four coils on the machine that I have made all have there own ac voltage, I put them through a bridge rectifier and put a 16000uF capacitor bank across the output and it's rated at 100volts in the image below is the setup of the coil and magnet arrangment the wheel spins at 550RPM so revs/sec equals 5.2 revs/sec and there are eight magnets either side alternating north south north south so from peak to peak there are 4 per revolution so 5.2 * 4 equals 36.7Hz. the voltage builds in the capacitor bank to 55v, my question is will the capacitor bank deplete when put through the IR2110 H-bridge and transformer or will the voltage stay at 55v? Thanks

ok I'll take photos later and then I'll be able to show you the machine cap bank rectifier

Hello,

You keep talking about a capacitor. What is the capacity and what is powering the capacitor?
A schematic would also help.

Bertus

 

[Maglatron]

I'm taking readings of the raw ac out put for each of the coils later today and am going to try build the circuit as accurate as possible to the machine

funny you should say that I've just been trying to mess about with spice, I don't know how to model my machine, so first step, going to take measurments of the coils raw ac put them through the rectifier (in spice) and set the frequency and put in the capacitor bank, so that's the plan for the minute, and make the spice simulation as close to the the real thing as possible, thanks though! what I do know is that the magnets pass the coils on one side of the wheel and the magnets on the other side of the wheel are 1/3rd out of phase and need to be able to model this the white circles represent the coils!

 

[bertus]

Hello,

Is this still related to this old thread?

https://maker.pro/forums/threads/any-difference-in-out-come-bridge-rectifiers.300061/

Bertus