Timeline for One flyback with two transformers
Current License: CC BY-SA 3.0
10 events
| when toggle format | what | by | license | comment | |
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| Oct 7, 2021 at 18:40 | comment | added | Andy aka | As always the first priority is to get something that will work.... then cost reduce. | |
| Oct 7, 2021 at 18:11 | comment | added | user76844 | I the end the power supply pushed four secondaries, one (5V) controlled and for relatively high power, the rest (12V) uncontrolled, with wide range LDOs to clip the voltage. Another few rails were solved by isolated 5V to 15V power supplies. Personally i hate this solution - it didn't solve the original problem and ended up being expensive both in production and RnD. Since then my strategy is to save on RnD, because anyway CHinese folks do better in production. So it's usually a single AC/DC power supply for like 24V@3A, and the rest by isolated DC/DC. | |
| Oct 7, 2021 at 18:04 | vote | accept | CommunityBot | moved from User.Id=76844 by developer User.Id=291299 | |
| Mar 8, 2017 at 20:56 | comment | added | Warren Hill | @GregoryKornblum Perhaps you should ask a new question telling us what outputs you require at what current. Place a link to this question for reference It may be a flyback with fewer outputs is the solution with other rails using some form of post regulation but it is difficult to advise without knowing exact requirements. | |
| Mar 8, 2017 at 19:49 | comment | added | user76844 | Guys, so what should I do? I need like eight secondaries, and i really don't want to use two feedback circuits and two controllers... And the transformer for 8 secondaries is too exotic for all suppliers i know. | |
| Mar 8, 2017 at 15:23 | comment | added | Warren Hill | Agreed definitely not good news. | |
| Mar 8, 2017 at 15:21 | comment | added | Andy aka | @WarrenHill it'll either saturate or you'll push too much voltage to the lightly loaded transformer's load. Either way it's not good news. | |
| Mar 8, 2017 at 15:10 | comment | added | Warren Hill | I'm not sure this analysis is correct since the primary wave-forms are the same so to some extent simple transformer should in the short term provide some control of the less loaded output. The current in the less loaded primary will not decay to zero however so I suspect it will saturate blowing up your primary switch. It is certainly not recommended though two or more secondaries on the same core is common and works well. | |
| Mar 8, 2017 at 9:08 | comment | added | user76844 | Just checking that the plan is cunning enough to not even start it... | |
| Mar 8, 2017 at 8:54 | history | answered | Andy aka | CC BY-SA 3.0 |