help with IR2110 chips

[Maglatron]

so i found this on another thread
"Sorry guys i forgot to tell you that i didnt connect the source of the low side mosfet in to ground ... but i connect it to the negative voltage (-310V)
So the output is alternating current isnt it ?
*see the red circle"

does this mean that i can create the alternating current with just one half bridge ir2110, I want to understand this

this is post 41 and I don't see it

ok yes sorry I got confused I see now, thanks again

yes sorry about that

I have a 146-300-255 toroidal transformer as a step up transformer and I want to model it in spice, the primary side is 55-0-55 and will be in parallel, the secondary is 115-0-115 and is connected at the centre tap so this makes the transformer 1:4.2 and it operates between 50hz and 60hz
I need to know

k = coupling factor
parameters of the inductors

L - inductance of the primary in henrys (open - nothing connected to the secondary)
Resistance of the primary winding
L - inductance of the secondary in henrys
Resistance of the secondary winding and for your information im putting the primary coils in parallel so it halves the resistance and alters the inductance
L - inductance of the primary winding when secondary is shorted
Interwinding capacitance
leakage inductance
and finally inductance coupling factor

Thanks for any help on this

 

[Minder]

Are you sure you don't have that backwards?
"primary side is 55-0-55 and will be in parallel, the secondary is 115-0-115 and is connected at the centre tap" ?
Typically that is the reverse (Primary/Secondary}. so that you can connect to 120 or 240 supply. (115-0-115)

 

[Maglatron]

no im correvt. if you have 55v through the first wire 55-0 and then it comes out the centre tap you connect the second 0-55if you parrallel so the turns ratio stays the same but there's less resistance, connecting the centre tap on the 115-0-115 makes the trqnsformer 1:4.2

I'm using as step up transformer

 

[Minder]

That wasn't my point,, I would assume that the original purpose of the TFMR was to be mains operated on 115/230 , which if so, make the 115-0-115 the (original) PRIMARY.

 

[Minder]

I'm using as step up transformer

OK.

 

[Maglatron]

the turn winding ratio is 1:4.2 therefore 55:230

the transformer is made by vigortronix 146-300-255
k = coupling factor
parameters of the inductors
L - inductance of the primary in henrys (open - nothing connected to the secondary)
Resistance of the primary winding
L - inductance of the secondary in henrys
Resistance of the secondary winding and for your information im putting the primary coils in parallel so it halves the resistance and alters the inductance
L - inductance of the primary winding when secondary is shorted
Interwinding capacitance
leakage inductance
and finally inductance coupling factor

thinking about just calling them up and asking direct

also need lib file for the UF4007 if possible all i have found is a text document here
https://www.vishay.com/docs/88184/uf4007.txt how do i make it into a lib file

?? any ideas

I'm really struggling to find the spice model for the uf4007 diode please can you tell me where to get it please?

also tried "mur1100 spice model" because I read in another thread that they are near identical to the UF4007, but I'm having no joy

anyone?

 

[Alec_t]

There are lots of 1kV fast-recovery diodes available (see e.g. https://www.digikey.co.uk/en/produc...xF3FBIAN3xXAE8RABMLEhiPXRAAVmQQPSgmfUzIJhSvIA ).
Won't one of those do?
For simulation purposes, note that breakdown voltage isn't usually modelled, so any fast-recovery diode model in your LTS installation would likely suffice.

 

[Maglatron]

There are lots of 1kV fast-recovery diodes available (see e.g. https://www.digikey.co.uk/en/produc...xF3FBIAN3xXAE8RABMLEhiPXRAAVmQQPSgmfUzIJhSvIA ).
Won't one of those do?
For simulation purposes, note that breakdown voltage isn't usually modelled, so any fast-recovery diode model in your LTS installation would likely suffice.

To be honest I'm winging it so I'm not too confident at deviating from the given values in the picture thank you for your help! for example do the resistors have to be quarter or half watt. I wanted to use for the electrolytic capacitors 22uf 100v, will that suffice aswell, I'm not sure how to choose the voltage rating of the ceramic 100nf caps because the list is extensive, also what voltage might be good for those?

Also, in ltspice how do I know which ones are fast recovery

Nevermind I found them which should I use for ( Iave ) average amps, intuition tells me that it can be a small value.

To be honest I'm winging it so I'm not too confident at deviating from the given values in the picture thank you for your help! for example do the resistors have to be quarter or half watt. I wanted to use for the electrolytic capacitors 22uf 100v, will that suffice aswell, I'm not sure how to choose the voltage rating of the ceramic 100nf caps because the list is extensive, also what voltage might be good for those?

If you could let me know ASAP please?

 

[Alec_t]

Are you asking for those values just for the simulation, or are you actually building the circuit?
For simulation only, the resistor power ratings and cap voltage ratings are irrelevant and using the default diode will be ok to get the sim running. You can worry about the values later. Once you get the sim running, LTS will calculate power dissipation in components and show what voltages the components are subjected to.

 

[bertus]

Hello,

I have "compacted" the thread by merging posts from the same user.
@Maglatron , you have the possibility to add info to a post by editing the post.
As far as I know you will have 24 hours to edit a post.

Bertus

 

[Maglatron]

Okay so today I will be builing the circuit in ltspice to get the simulation working, then worry about actual values later (because I will be builing at some point) thank you for your help. I still want to design the transfomer, any ideas on that, for the sim sake?

ok I have made the circuit in ltspice and it looks messy but correct I now want to apply an anti logic antiphase so that when 1 set of the fets is on the other is off and vice versa can you let me know how also not designed the transformer yet, do you have any suggestions? and include dead time aswell

 

[Alec_t]

My sim experience with transformers is limited to starting with a turns ratio and squaring that to get an inductance ratio (which is what Spice needs), then guestimating coil resistance values. For a rough idea of dead-time, look at the total gate capacitance value given in the datasheet for the particular FETs you will be using, then calculate the gate charge and discharge time constants.

 

[Maglatron]

cool as a cucumber, cheers im going to try now

Okay I have the turn ratio as 4.2 so the inductance ratio is 17.64 (where do I enter this value) also primary resistance is 0.25ohm and the secondary is 4.85ohm. I'm on the datasheet, am I looking at the input capacitance, output capacitance or feedback capacitance?

when I right click the inductor symbol it does not say anything about inductance ratio, thanks for any help. I am nearly at simulation stage, I just need to know how to set up the logic antiphase anti logic pulses of 3.3volt alternating toggling and the dead time which I'm dong right now, I'm just trying to determine weather I need the input capacitance of the FET IRF640 or output capacitance or the feedback capacitance.

yes I have double checked I can't find an option for Inductance ratio...

Okay done the transformer, now all I need its how to set up the pulses and also wondered if I can model a motor in spice because that is where the output to the transformer will go to.

my nearly complete scematic!

 

[Alec_t]

the inductance ratio is 17.64 (where do I enter this value)

You enter the primary inductance value (if known, or your choice), then use the inductance ratio to calculate the secondary inductance and enter that.

 

[Maglatron]

thank you I've figured it, now I need to know is gate capacitance the same as input capacitance, output capacitance or feedback capacitance and also I need to know how to setup an anti-phase signal

 

[Alec_t]

Here's an example of generating anti-phase signals with dead-time defined by the dt parameter:-

 

[Maglatron]

Okay so that means abolutely nothing to me but thanks for the answer also do you recon the transformer I have (300watt 230v transformer) will be in micro or milli henrys and I see something about dead time. what does .tran 100m mean. I aso am still trying to determine if, is gate capacitance the same as input capacitance, output capacitance or feedback capacitance?

by the way I'm very greatfull for the help. sorry if I come across a bit ignorant im new to this. could you talk me through making the anti-phase hook-up

I think it has something to do with the spice directive

also I want it to be square wave, probably important

 

[Maglatron]

Okay I think Ihave the gate capacitance Ciss is 1850pf

yeah I really need an extra nudge, cheers

 

[Maglatron]

Okay I think Ihave the gate capacitance Ciss is 1850pf

yeah I really need an extra nudge, cheers

how do I work out the dead time from this?

 

[Maglatron]

also at the other side of the transformer (output) there is going to be a 230v 15w ac motor single phase, how do you simulate that?