# Thyristor model Example **URL:** \ **Category:** PLECS\ **Tags:** thermal-model\ **Created:** [November 6, 2024, 8:06am UTC](https://forum.plexim.com/t/thyristor-model-example/1485 "2024-11-06T08:06:47Z")\ **Posts on this page:** 12\ **Page:** 1
**Author:** ![keme](https://avatars.discourse-cdn.com/v4/letter/k/b5a626/32.png) [@keme](https://forum.plexim.com/u/keme)\ **Post date:** [November 6, 2024, 8:06am UTC](https://forum.plexim.com/t/thyristor-model-example/1485/1 "2024-11-06T08:06:47Z")
Hello: I would like to simulate a rectifier based on thyristors,. Demo file examples work fine in the electrical domain. In my case I would also like to include the thermal behaviour of the rectifier, so as starting point I’d like to use any thyristor model which includes electrical and thermal behaviour. Do you have any thyristor model example or / and library (I have looking for them and I haven’t found any)? Thanks, ---
**Author:** ![Bryan\_Lieblick](https://dub1.discourse-cdn.com/flex006/user_avatar/forum.plexim.com/bryan_lieblick/32/10_2.png) [@Bryan\_Lieblick](https://forum.plexim.com/u/Bryan_Lieblick)\ **Post date:** [November 7, 2024, 4:35pm UTC](https://forum.plexim.com/t/thyristor-model-example/1485/2 "2024-11-07T16:35:19Z")
You can create your own PLECS thermal models from datasheets if a manufacturer does not provide a ready made model. Please see the “Importing Data from Graphical Datasheets” section of the PLECS manual and the [associated video](https://www.plexim.com/support/videos/thermal_import_wizard). You can also construct a model using a formula based approach as well, if you have a good reference on modeling thyristor losses. ---
**Author:** ![keme](https://avatars.discourse-cdn.com/v4/letter/k/b5a626/32.png) [@keme](https://forum.plexim.com/u/keme)\ **Post date:** [November 8, 2024, 6:04am UTC](https://forum.plexim.com/t/thyristor-model-example/1485/3 "2024-11-08T06:04:48Z")
¡Thanks!. I’ll use it, as long as it’s difficult to find plecs thyristor libraries. ---
**Author:** ![Den0320](https://avatars.discourse-cdn.com/v4/letter/d/fbc32d/32.png) [@Den0320](https://forum.plexim.com/u/Den0320)\ **Post date:** [February 4, 2025, 8:24am UTC](https://forum.plexim.com/t/thyristor-model-example/1485/4 "2025-02-04T08:24:23Z")
Hello Have you any progress in creating a thyristor thermal model? If you have, can you show one example of model? ---
**Author:** ![Kris\_Eberle](https://dub1.discourse-cdn.com/flex006/user_avatar/forum.plexim.com/kris_eberle/32/6_2.png) [@Kris\_Eberle](https://forum.plexim.com/u/Kris_Eberle)\ **Post date:** [February 10, 2025, 6:08pm UTC](https://forum.plexim.com/t/thyristor-model-example/1485/5 "2025-02-10T18:08:42Z")
@Den0320 in the meantime, do you have any specific part number or struggle to develop a model that you can share? ---
**Author:** ![Den0320](https://avatars.discourse-cdn.com/v4/letter/d/fbc32d/32.png) [@Den0320](https://forum.plexim.com/u/Den0320)\ **Post date:** [February 11, 2025, 4:37am UTC](https://forum.plexim.com/t/thyristor-model-example/1485/6 "2025-02-11T04:37:01Z")
Conduction losses are good, but switching losses are very small, I think I am not setting up switching losses correctly in the model Thyristor 5STP18H4200 [5STP18H4200 (1).xml](https://forum.plexim.com/uploads/short-url/rjw9oGSYKn0h3iu9FDezoGowesz.xml) (135.3 KB) ---
**Author:** ![Kris\_Eberle](https://dub1.discourse-cdn.com/flex006/user_avatar/forum.plexim.com/kris_eberle/32/6_2.png) [@Kris\_Eberle](https://forum.plexim.com/u/Kris_Eberle)\ **Post date:** [February 13, 2025, 12:34am UTC](https://forum.plexim.com/t/thyristor-model-example/1485/7 "2025-02-13T00:34:16Z")
I would suggest that you contact the manufacturer here to inquire about switching loss definition. They have models for other devices including IGCTs, and the order of magnitude of your switching losses compared to them seem reasonable, but we cannot really say how best to model these based on solely the datasheet curves provided. Also, how did you generate the thermal chain coefficients in your model? It seems that the values I see in a datasheet available online are different: ![Screenshot 2025-02-12 at 4.33.36 PM](https://europe1.discourse-cdn.com/flex006/uploads/plecs/original/2X/9/9a138f178dbfb715db674f9300bd8255682a96aa.png) ---
**Author:** ![Den0320](https://avatars.discourse-cdn.com/v4/letter/d/fbc32d/32.png) [@Den0320](https://forum.plexim.com/u/Den0320)\ **Post date:** [February 13, 2025, 4:29am UTC](https://forum.plexim.com/t/thyristor-model-example/1485/8 "2025-02-13T04:29:41Z")
I converted K/kW to K/W ---
**Author:** ![Kris\_Eberle](https://dub1.discourse-cdn.com/flex006/user_avatar/forum.plexim.com/kris_eberle/32/6_2.png) [@Kris\_Eberle](https://forum.plexim.com/u/Kris_Eberle)\ **Post date:** [February 13, 2025, 8:21pm UTC](https://forum.plexim.com/t/thyristor-model-example/1485/9 "2025-02-13T20:21:26Z")
Hmm, I’m not seeing simply the 1/1000x scaling factor here, but rather just different numbers: ![Screenshot 2025-02-13 at 12.20.53 PM](https://europe1.discourse-cdn.com/flex006/uploads/plecs/original/2X/e/e974ad0d61e4e25b8e2338590f7c50cb0677a7dd.png) ---
**Author:** ![Den0320](https://avatars.discourse-cdn.com/v4/letter/d/fbc32d/32.png) [@Den0320](https://forum.plexim.com/u/Den0320)\ **Post date:** [February 14, 2025, 5:16am UTC](https://forum.plexim.com/t/thyristor-model-example/1485/10 "2025-02-14T05:16:10Z")
![image](https://europe1.discourse-cdn.com/flex006/uploads/plecs/original/2X/8/8d8caedd92957c5bd0ab683d57894e9c41fc982d.jpeg) As I understand it, if the firing angle is 60 restangular, then +2 ---
**Author:** ![Kris\_Eberle](https://dub1.discourse-cdn.com/flex006/user_avatar/forum.plexim.com/kris_eberle/32/6_2.png) [@Kris\_Eberle](https://forum.plexim.com/u/Kris_Eberle)\ **Post date:** [February 14, 2025, 5:06pm UTC](https://forum.plexim.com/t/thyristor-model-example/1485/11 "2025-02-14T17:06:41Z")
Oh okay I wasn’t aware of your control scheme. Though I do find that confusing- is it intended to add 2K/kW to each resistance element or to the overall total? Anyway, I would need to better understand this instruction about the Rth adder to be confident in my answer, and trust that you will do this research yourself! Still, you want to know if your switching losses are accurate and all I can offer there is still to recommend that you contact the manufacturer to get some more insight. ---
**Author:** ![Den0320](https://avatars.discourse-cdn.com/v4/letter/d/fbc32d/32.png) [@Den0320](https://forum.plexim.com/u/Den0320)\ **Post date:** [February 17, 2025, 4:24am UTC](https://forum.plexim.com/t/thyristor-model-example/1485/12 "2025-02-17T04:24:54Z")
Ok, I can’t be 100% sure about Rth either. Just trying to figure it out. Thanks for the answers!