Can someone please help me learn how to make automatic switching based on available voltage sources to power up a three-input buck-boost converter?

An example of this operation would be:

TEG: 0.3 - 0.4V

PV: 0.4 - 1.2V

PZT: 1.2 - 2V

Ideal Output: 1.8V

If the available source is TEG, then the system will operate in boost mode; if the available source is PV, then the system will operate in boost mode, and the system will operate in buck mode if PZT is available.

Answer 1

[Yash]

Hi Danikha,

I understand that you are facing issues in implementing automatic switching based on the input voltage to power up a three-input buck-boost converter. To achieve this, you would first need to invoke the if-else conditions in your model.

You can utilize a switch block in your model to invoke the if-else conditions. Since your logic requires many conditions, you can use multiple switch blocks in series to implement the logic.

Refer to the image below for the implementation.

Edit: The above mentioned method could create hassle when there is a large number of inputs. It is better to use the variant source block to achieve the same. The documentation for the variant source block is available at the link below:

https://www.mathworks.com/help/simulink/ug/define-and-configure-variant-sources-and-sinks.html

I hope this addresses your query.

Best Regards

Yash

[Danikha Shyken]

May I ask if the values 100, 50, and 5 were regarded as inputs?

[Yash]

Hi Danikha,

Based on the limited information provided in the question, I have made assumptions for the input values. I have considered the input for TEG as 100, the input for PV as 50, and the input for PZT as 5. The input voltage is set to 1 V which falls within PV Category and hence the output is 50.

[Danikha Shyken]

I've wrapped my head around it now. You've been a huge help. Your assistance has been incredibly valuable, and I'm so thankful.