I want to use a comparator to compare a sine wave and a triangle wave in simscape. I can't get the components to connect.

I'm using Simscape electrical to design a control strategy for the switches in a dc/ac inverter, and I can't get the triangle wave generator to connect to the negative side of the comparator, even with the Simulink-PS Converter. Thank you in advance for any assistance you can provide.

[Steve Barry]

Also, what connects the output of a CMOS Not to the input of a PS-Simulink Converter? Thanks again.

Answer 1

[Joel Van Sickel]

Unfortunately, the ps signal blocks don't work with those connection labels. Instead, you can make the switches take in electrical wires instead of physical signal blocks. The electrical wire does work with the connection labels. To do this, right click the switch, and find the simscape menu, go to block choices, and select electrical control port. Please see the image below.

Answer 2

[Joel Van Sickel]

You need to use the Ps-Simulink converter, and then feed that signal into a controlled voltage source to interface with the elctrical comparator. Or, you can do everything in simulink and only bring out the gate signal once it is generated.

Regards,

Joel

[Steve Barry]

I'm trying to interface with the output of the comparator/the output of the cmos not gate attached to the output of the comparator.

The PS-Simulink converter does not attach to either of those outputs.

AAlternatively, if I am to do everything in Simulink, what do I use in place of the comparator that does not have a boolean output?

[Joel Van Sickel]

If you stay in simulink, you can convert the boolean output back to a double and multiply it by whatever value you want. Can you provide a picture of what you are trying to do in Simscape?

[Steve Barry]

Answer 3

[Amrtanshu Raj]

Hi,

You need to use a controlled voltage source block to convert a physical signal to a Electrical Signal.

I have attached a sample model that explains how to interface a Sine wave Block with Comparator. You can modify it as per your needs.

Hope this helps

[Steve Barry]

Take your attached sample model and connect an IGBT gate to the output of the comparator and you will have solved the problem I am having. I can connect the wave generators to the comparators. I cannot connect the comparators to the gates. PS-Simulink converters don't seem to be helping.

[Amrtanshu Raj]

Hi,

As per your original question, it seems that you had problem connecting waveform generator with Comparator.

You need to use the Voltage sensor block to connect the Comparator output to the IGBT gate. I have updated the model and attached it.

[Steve Barry]

My apologies for the confusion. The original problem has evolved. Here's a picture of where I am now.