How to build the hardware basd on the simulated results ?  - Page 1
Forum section: electronics / projects

author: Patrick66
author_rank: Regular Contributor
timestamp: January 14, 2024, 03:15:37 am
content: Hello everyone, I would like to ask how do I build the hardware based on the simulated result because from the video I see that the opamp and optocoupler have values of Rd, Vf, CTR, Cop........ Can I buy the opamp and optocoupler without considering the values of Rd, CTR, Ao, Rf, Ro, etc? If the specified values are important when buying the components then may I ask how to buy the correct component based on the video below? Moreover, may I ask what the U7 is it a normal opamp? The link is as follows:Thank you for you time.

author: coromonadalix
author_rank: Super Contributor
timestamp: January 14, 2024, 03:21:03 am
content: as i see it its not complete and miss a few things ... some proof of a concept but still incompleteressemblance of this one ??https://www.researchgate.net/figure/Proposed-offline-LED-driver-without-electrolytic-capacitor-and-its-auxiliary-power_fig9_254057348

author: dobsonr741
author_rank: Frequent Contributor
timestamp: January 14, 2024, 05:13:27 am
content: The design process in this case should be:1. Initial simulation based on just parameters picked, as in the video2. Select components, based on availability, cost any only other preference3. Re-run the simulation using the selected real components and their actual model4. Adjust concentrated params (resistors/capacitors) to return the circuit to the expected optimum.5. Optional: calculate the impact of the variance of the part parameters, like the optocoupler's, to influence the next selection cycle6. Repeat from step 2 until reached the expected results7. Start building the physical prototypeChances are the prototype will not reach expectations, as the simulation was incorrect, did not consider Parasitics or manufacturing variances and the whole cycle needs repeating from the get-go.

author: Patrick66
author_rank: Regular Contributor
timestamp: January 14, 2024, 12:10:45 pm
content: Hello Sir, how can I find the same components as the YouTube video? Does the datasheet of opamp and optocoupler show the values for Rd, Vf, CTR... etc? Sorry for my ignorance. Thank you for your time. If possible do you have any guide on teaching how to build a LED driver using flyback converter in dsicontinuous conduction mode for constant current output monitoring.

author: coromonadalix
author_rank: Super Contributor
timestamp: January 14, 2024, 07:40:27 pm
content: simply NOTthis is incomplete, you can not add or invent the missing parts, find a "complete project"

author: Patrick66
author_rank: Regular Contributor
timestamp: January 15, 2024, 05:41:32 pm
content: Hello sir, do you have any example of projects that uses flyback converter for LED driver in DCM mode?

author: wasedadoc
author_rank: Super Contributor
timestamp: January 15, 2024, 05:44:15 pm
content: Quote from: dobsonr741 on January 14, 2024, 05:13:27 amparalytics ??

author: coromonadalix
author_rank: Super Contributor
timestamp: January 15, 2024, 06:00:25 pm
content: @Patrick66please stop being lazy ... you can find many projects / schematics / .... on the web ...a simple search ..https://electronics.stackexchange.com/questions/427861/why-would-discontinuous-conduction-mode-be-desirable-for-an-led-driver

author: dobsonr741
author_rank: Frequent Contributor
timestamp: January 15, 2024, 07:36:13 pm
content: Parasitics, corrected