Hi! I am working on switching of MOSFET. I tried to run the mosfet in half bridge configuration. The simulation got stuck at 0.4%. I am switching the mosfet at 100 kHz frequency. I was able to drive the mosfet alone (in boost converter circuit). But when I tried to drive the mosfet in half bridge configuration, I could not run it. The gate driver I am using is ACPL 337J (Datasheet- https://www.mouser.com/datasheet/2/678/V02-4390EN_DS_ACPL-337J_2014-05-09-909393.pdf). The mosfet I am using is STF27N60M2-ep (Datasheet- https://www.st.com/resource/en/datasheet/stf27n60m2-ep.pdf). The schematic of boost converter circuit is -

Please find the attached schematic (LTspice) of boost converter circuit (Draft 29).
I implemented this circuit in half bridge configuration.-


Please find the attached schematic of half bridge configuration (Draft 30).

Please help me pointing out where I am doing it wrong. Also please upload the corrected schematic.
Please find the attached library of mosfet.

 

I uploaded different mosfet schematic(Draft 30). Please find the updated schematic here.
Thanks

 

hi Siddharth.
Welcome to AAC.
Do you have the LTS model of the ACPL you could post.?
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Uploading acpl 337j gate driver spice model.

 

hi S,
That file is empty, zero size...
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EDIT: I see you have corrected that file ..

 

hi S,
Got that model OK, but you have not included the LTS asy file...
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hi S,
All the circuit models/libs/asy etc are in your C3M0030090K.lib.
I am unable to run the sim without all the supporting models etc....
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Please find the updated file.

 

100 kHz frequency

Spice trivia :
try more relaxed PWM rise/fall times --and/or-- adding a reasonable series resistance to

• PWM
• Vs
• Large ballast/smoothing capasitors

? put a diode (in front) in series with L1 300µH
(+perhaps C(<0.1uF) --or-- RC(in series) in parallel with M1.drain - source)

-- the Spice don't like too high ("unlimited") instantaneous currents & frequencies

(sometimes adding the 1N4148 or UPSC600 reverse to G-S terminals of the MOS-Fet let's you run a complex circuitry)

 

hi,
I need the ACPL337 asy file.
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Hello,

The .asy and .lib are allowed extentions.
You can upload them to the forum.

Bertus

 

ACPL 337J .asy file uploaded

 

Hi S,
Combined all the models, but look at this clip, when I try to run it, you have embedded the ACPL lib in your folders and I cannot access it to change to my folder.
If the lib path was on the circuit diagram I could edit to suit my folders.
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You see I have changed the STF pointer OK.

 

Hi S,
Combined all the models, but look at this clip, when I try to run it, you have embedded the ACPL lib in your folders and I cannot access it to change to my folder.
If the lib path was on the circuit diagram I could edit to suit my folders.
E
You see I have changed the STF pointer OK.

If you have downloaded the SPICE model of ACPL-337J, open the spice model and right click on the command-
".subckt ACPL-337J VEE1 VIN+ VCC1 VLEDDRV UVLO_B FAULT_B ANODE CATHODE"
Go to create symbol. LTspice will ask if you want to automatically create the symbol from netlist. Click yes.
The acpl 337j symbol is generated in your library. Now click add new component. There you will find a folder named [AutoGenerated]. Open the folder. There is your acpl 337j optocoupler sitting.
Similarly, if the STF file is working then ok. If not then follow this:-
Go to Edit-> SPICE Directive'S'. Click on it. A new dialogue box will open. Write ".lib" and press OK(make sure it is selected on SPICE directive). Plce this .lib on anywhere on board. Now right click on this .lib text. click browse and select the library file.
Go to the mosfet and press Ctrl+right click. Change the prefix to X and Value to STF27N60M2-EP_V2. Click OK.
There you are all set to use the schematic

 

hi S,
Followed those steps for the ACPL, still locked out.
The STF is OK.
I will retry again later today.
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hi SS,
Deleted 1st attempt, redone, now its reporting the 'time step too short' in the MOSFET.
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* Copyright 2014 Avago Technologies Limited. All Right Reserved
*
* ACPL-337J Spice Macromodel
* Rev.A
* 1/14
*
* SPICE Model is verified by Orcad PSpice at Ta=25^C.

one of the problems may be using the Pspice model
. . . the more simple models may be easier to adjust for LT - difficult ones require skills i don't yet have . . .

↑↑↑ = try running one of these iC-s in it's factory recommended test circuit - see if it does anything

other (fast) options may be

• don't step the sources at startup if you do --or-- step 'em if you don't
• use alternate Solver if you use Normal --or-- the way around
• introduce 2Ω resistance to your supplies ( perhaps with ≥ (330/)470µF "ballasts")
• etc.

 

hi SS,
Deleted 1st attempt, redone, now its reporting the 'time step too short' in the MOSFET.
E
View attachment 184621

Do one thing, go to control panel of ltspice select spice and there select Gear as default integration method. After this, go to spice analysis and there put 1n in maximum time step.

 

hi,
Running without the MOSFET's shows that both MOSFET are being switched On at the same periods, effectively shorting out the 200V supply???

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@ericgibbs Please find the updated schematic. Change the input voltage (v5) from 15v to 600v.