Timeline for CFL Ballast Calculate Primary Turns
Current License: CC BY-SA 4.0
12 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jul 2, 2020 at 14:53 | history | edited | Dave Tweed | CC BY-SA 4.0 |
put image inline
|
| Jul 2, 2020 at 12:32 | history | edited | rantoniusw | CC BY-SA 4.0 |
edited title
|
| Jul 2, 2020 at 12:25 | comment | added | rantoniusw | Hello winny, I added the rquested schematic of you to the original post. Here again: duckduckgo.com/… | |
| Jul 2, 2020 at 12:22 | history | edited | rantoniusw | CC BY-SA 4.0 |
added 226 characters in body
|
| Jul 2, 2020 at 12:09 | comment | added | rantoniusw | Hello winny, thank you for your answer. Here is how I got the 5 turns, t=Vout/2/(Ae in m²)/300khz/0.38T; t=6V/2/0.00000518m²/300khz/0.38T; t= 5,08 I chose maxiumum field 2x because of a flyback transfomer. What is incorrect here winny? I chose 300khz because I have to guess a freuency, I have no ide at what freuency a flyback like this would swing at. I'd like to hear your professional advice if you want to help me. I will try to give you a schematic to have a look at, since you want one, but I don't know how it works here. | |
| Jul 2, 2020 at 11:54 | history | edited | rantoniusw | CC BY-SA 4.0 |
edited body
|
| Jul 2, 2020 at 11:52 | comment | added | rantoniusw | Thank you winny for editing the messy original post! duty cycle =40%. The Ae is 51,8mm², and I strongly suspect core is overkill for a 5,5W load capable of max. 70W forward mode? And that could be one reason why I get 4 or 5 turns prim. with the formulas, because of very high cross Area of 51,8²? with a very low inductance primary 0,604uH, secondary 43,671uH. The Fsw (switching freq.) I chose to be 300khz, but it's purely copycatted, edmucautiously guesstimated. I might as well choose 25khz and by chance get more turns? Though I did put 300khz into the fromula as exampled in the guide. | |
| Jul 2, 2020 at 11:29 | history | edited | rantoniusw | CC BY-SA 4.0 |
added 1 character in body
|
| Jul 2, 2020 at 11:24 | comment | added | winny | Welcome to EE.SE! "estimated guessed" That won't work. You need to know your switch frequency, max on-time at max input voltage and core area to get started. Calculate according to Vt=NAB. Also, please show your schematic. | |
| Jul 2, 2020 at 11:21 | history | edited | winny | CC BY-SA 4.0 |
English
|
| Jul 2, 2020 at 11:18 | review | First posts | |||
| Jul 2, 2020 at 12:17 | |||||
| Jul 2, 2020 at 11:16 | history | asked | rantoniusw | CC BY-SA 4.0 |
