Circuit making and Simulation from Complex schematic

[adeel.sid]

Hello all

I want to ask is there a way to simulate a complex circuit consists of many power transistors, ICs and opamps. The schematic also show some transformer whose details are not given.

Is it possible to simulate such a circuit?
How can I assure its functionality?
Also, is it good idea to study each component and carefully check interfaces (instead of doing simulation)

Please help

Regards

 

[andre_luis]

Modern SPICE-based device model manufacturer libraries are quite representative of the real electrical behavior of the component, so that if your design do not operate at an extremelly high speed and simulation configuration parameters are properly sized, there is practically no restriction to do that.

 

[adeel.sid]

Modern SPICE-based device model manufacturer libraries are quite representative of the real electrical behavior of the component, so that if your design do not operate at an extremelly high speed and simulation configuration parameters are properly sized, there is practically no restriction to do that.

Thanks for reply

Can I do this on proteus?
could ICs like MC34063 or TL494 available?

Sorry for my very basic questions, I have done simple simulations but not sure how to perform simulations of circuits having many ICs

 

[andre_luis]

I don´t use Proteus, but LTSPICE. Anyway there are no techical difference to perform a simulation on a basic or densely populated circuit. Both these components above mentioned are relativelly usual in many designs and you probably can find models available on the Web with no much difficult.

[EDIT]

You can find LTSPICE schematic library and circuit model for both here.

 

[adeel.sid]

my schematic shows 8 pin transformer that I'm not sure and also many points showing "N(no)>>"
are these necessary for simulations? (I guess Yes)

 

[Dan Mills]

Usually you only simulate those bits of a circuit that are likely to be interesting, I don't think I have ever simmed a complete system.

So I might for example simulate a filter or a servo loop or something but would be unlikely to simulate a bit of jellybean logic unless if was running very fast or had some other interesting attribute.

If you want to simulate the part of the system including the transformer then yes, of course you will need to include the transformer in the sim, measure winding and leakage inductances and you can usually figure out what you need to feed the sim.

I would think your numbered points are probably off sheet markers that connect to the same numbered points on another page.

Regards, Dan.

 

[adeel.sid]

Usually you only simulate those bits of a circuit that are likely to be interesting, I don't think I have ever simmed a complete system.

I would think your numbered points are probably off sheet markers that connect to the same numbered points on another page.

Regards, Dan.

You mean to say that simulating some parts, like ICs (MC34063,etc) and transistors (IRf3205,SLP740C,etc) are enough?
Is it the right way if I just go through datasheet, understand graph and verify through simulation?

Right!
There are many connections going from one page to another and I'm confuse in their values as well

 

[Dan Mills]

Not usually, you generally ned moe then that.
Usually I would simulate some functional block rather then an entire system, so maybe an opamp and its surrounding feedack network or a power converter or oscilator or something rather then all three together.

Simulation time is sometimes exponential with network complexity so simulating a dozen small circuits separately can be **MUCH** quicker then simulating a single large circuit.

There is something of an art to getting a simulator to tell you what you want to know, and sometimes you end up simulating somethhing that looks rather different to the original schematic (Uninteresting things like current sources and bias dividers can be replaced wholesale with the corresponding simulation blocks for example at massive time saving).

While you can simulate a multi page mixed signal schematic, I am somewhat confused as to why you would want to?

 

[adeel.sid]

While you can simulate a multi page mixed signal schematic, I am somewhat confused as to why you would want to?

Is there another way to verify working of circuit?

It will save my time if you guide towards smarter way

 

[andre_luis]

As Dan Mills said, simulate the entire circuit is not so usual, but if you have time to wait, go ahead.

 

[adeel.sid]

I dont have time and I don't want to ONLY if another option is available

Any thought?

 

[andre_luis]

Another option would be separately simulate each functional part of the circuit, replacing it with a simplified model in the next phase, and so.

 

[adeel.sid]

Thanks andre