find and set simulink parameters for several blocks

I have a simulink model with number of subsystems. For example I have used simpower systems MOSFET in multiple places within my model.

At the moment I use the following code. But limitation is, that the bock paths/Names should be known.

for x=1:4  %debug_14.slx is the file name%
modd=sprintf('debug_14/HBridge/Mosfet%d',x);
set_param(modd,'Ron','3');
end

Now what if I have several Mosfet blocks, then it hard to specify the block path individually. I need to set Ron=3 for all Mosfets within my model. How can I programatically search mosfet blocks and set_param.

Answer 1

[Debarati Banerjee]

Regarding this question:

Find the attached sample model (‘trial_model.mdl’)where there are multiple ‘Gain’ blocks in the top model and also in subsystem. The path and names of all the ‘Gain’ blocks present in the model ‘trial_model’ can be found by the following command:

>>block_name = find_system('trial_model', 'BlockType', 'Gain')

Here block_name will be an n*1 cell array containing the names of all the ‘Gain’ blocks present in the model ‘trial_model.mdl’.

Then you can consider to run the following loop to change the parameters of each of the block. You can refer to the following sample code:

>> n=length(block_name)
     for i=1:1:n
        set_param(block_name{i,1},'Gain','15') %%Changing ‘Gain’ of all the ‘Gain’ blocks to 15
     end

[Rashmil Dahanayake]

The problem with MOSFET is it comes with sysmpower systems tool box. The block type appears to be a subsystem. Hence what should I specify for the keyword search for 'Blocktype'. Updated mdl file attached with MOSFETs in top level and subsystems.

Answer 2

[Rashmil Dahanayake]

A temporary way around this. Works only if a Tag is specified under block properties.

trial_model;  
cc=find_system('trial_model','Regexp', 'on','Tag', 'mo(.*)');
  for x=1:length(cc)  
  block1=cc{x};
  set_param(block1,'Ron','3');
  end

limitation: Once off Tag set up for blocks required

Answer 3

[Orion]

Hi,

try this

MyMosfetBlock = find_system('trial_model','SourceType','Mosfet')

specific property of your Mosfet block

then you use set_param to change the parameter you want.

[Rashmil Dahanayake]

it returns an empty cell array. Which means the search criteria unable to locate mosfets.

Answer 4

[Orion]

I tried

MyMosfetBlock = find_system('trial_model','SourceType','Mosfet')

with the mdl you attached, and I got the result

MyMosfetBlock = 

      'trial_model/Subsystem/sw1'
      'trial_model/Subsystem/sw2'
      'trial_model/sw1'
      'trial_model/sw2'

i have Matlab 2014a, but this command line should work with every version.

Do you use Libraries, Masks ?