Basil Posted November 22, 2021 Share Posted November 22, 2021 (edited) Hi, just to be sure I am not an expert in electronics!!!!!!!!!!! Some time ago there was some postings from a number of experts about the title subject. There were also some circuit diagrams, albeit fussy ones , this mean not all of the print was readable. I have obtained a 100 amp mosfet (360amps,!XFN360N10T)and would like to use this in the fashion descibed. Can anyone supply a cicuit diagram for the Zener/resistor and condensor that is required. Can anyone advise me if the mosfet can be used without further cicuitry. Basically HELP. I would much appreciate some advise as to the use of such a device which means far easier Lipo switching using the Lipo itself as a power source, and a low volt simple on/off switch ,without bulky relays or what ever. Thanks in advance. Bas Edited November 22, 2021 by Basil Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted November 22, 2021 Share Posted November 22, 2021 Sorry Bas, have read through the previous lipo switching posts, and this is to save taking off an elasticated wing, or building a hatch. Quite rightly, the lipo is buried in the inaccessible model, and is a problem. But, an Arming Plug is so much simpler. Arming Plugs are available online or easily constructed. Is your ESC 100AMPS ? That is a lot of potential power for an elastically positioned wing. Quote Link to comment Share on other sites More sharing options...
EarlyBird Posted November 23, 2021 Share Posted November 23, 2021 14 hours ago, Basil said: I have obtained a 100 amp mosfet (360amps,!XFN360N10T) I have found an IXFN360N10T which is 100 volts 360 amps. ? I assumed ! was a typo and amp was volts. This thing is huge! unless I have made a mistake.? Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted November 23, 2021 Share Posted November 23, 2021 Apologies Lads, missing words make my previous post appear nonsense. I read back over Bas's problem of switching, and realised, as always, there are many solutions. Mosfet switching, to me, just adds another layer of complexity and cables, and has a place in scale models, to hide the switch away. 100AMPS appeared in the frame and seemed excessive. Did you know that most of your house operates between 13A and 30A, and by law, you must call in a Qualified Electrician to rectify faults. Here we are discussing 100AMPS ! ! ! Quote Link to comment Share on other sites More sharing options...
Nigel R Posted November 23, 2021 Share Posted November 23, 2021 I think we need to take a step back. What exactly are you switching on/off? (as stated, if this is arming/disarming, for people such as us there are better and simpler ways) 1 1 Quote Link to comment Share on other sites More sharing options...
Frank Skilbeck Posted November 23, 2021 Share Posted November 23, 2021 Dennis, I have a couple of electric models that pull more than 70amps under load, so any switch has to be rated above this. But getting back on topic, if the continuous current is less than 35 amps, Multiplex do their Antiflash unit to which you can add an arming switch. It used to be that brushless speed controllers were fitted with an arming switch, I've got a couple, but you don't see these around anymore. Quote Link to comment Share on other sites More sharing options...
EarlyBird Posted November 23, 2021 Share Posted November 23, 2021 48 minutes ago, Denis Watkins said: Here we are discussing 100AMPS ! ! ! The data sheet here says it is 360AMPS 100Volts. Hence my surprise. Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted November 23, 2021 Share Posted November 23, 2021 The point I failed to make clear was as we learn and develop in the hobby, and we don't quite understand some of the implications, Then go for simpler solutions, as stated above by others. Electronics is no way a " trial and error " activity. High amps are common these days and like any plan, you must stick to known outcomes with your gear. Quote Link to comment Share on other sites More sharing options...
Basil Posted November 23, 2021 Author Share Posted November 23, 2021 I'll try and cover some of the comments made so far; I did make a typo, its capable of handling 100volt, 360amp( I am only a beginer but large lipo's go over 100+ amps, if I am correct.I could have selected a slightly lower volt & amps but this was on offer. (Being as its a leap into the unknown for me I whent for its higher handling capabilities). Early bird, thats the one. Dennis, just have a look at a few heavy duty ESC's, high amps!!!!! even if its for a short time. It weighs 37gr, is 38mm x 24mm x17mm including the terminal screws, I dont call this big,after all it was meant for large models. At the moment I am using Exterior mounted arming plugs, but these are ugly( Talking scale here) and not easy to manipulate. Easy to hide away a low volt switch.( Underneath perhaps.) Personally I think this idea is worth persueing it hardly hitech/weighty etc it does not require a high wiring content as suggested, just a cut in the main lipo lead and a very small number of additional components that have almost no additional weight . I am trying to get those who first put this subject on the forum and showed the circuits to come forth and let me know the details of the simple circuits they originally discussed. No names mentioned.I dont know enough about electronics to be sure I have the correct info, even though I have a strong interest in the subject. So to those who first discussed this, please can you give me some more details. I thanks those in advance; Bas Quote Link to comment Share on other sites More sharing options...
Andy Stephenson Posted November 23, 2021 Share Posted November 23, 2021 Basil, You may need a heatsink on that device if you are going to push it any where near it's full spec. Be aware the heat in watts can be calculated by the formula P+I^2R meaning the current in amps squared multiplied by the on resistance of the MOSFET .0026 Ohms. Its specified to be able to dissipate as much as 830 Watts but only on a large heatsink otherwise it would overheat and burn out. What is the maximum current you want it to pass, a lot depends on this. Quote Link to comment Share on other sites More sharing options...
Brian Sweeting 1 Posted November 23, 2021 Share Posted November 23, 2021 5 hours ago, Denis Watkins said: <snip> Did you know that most of your house operates between 13A and 30A, and by law, you must call in a Qualified Electrician to rectify faults. Here we are discussing 100AMPS ! ! ! ++ Agreed but that is at a different voltage. Rough figures... 100 amp at 12 volts is 1200 Watts, at 230 volts it is 23000 Watts. 5 hours ago, Denis Watkins said: Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted November 23, 2021 Share Posted November 23, 2021 4 minutes ago, Brian Sweeting 1 said: ++ Agreed but that is at a different voltage. Rough figures... 100 amp at 12 volts is 1200 Watts, at 230 volts it is 23000 Watts. Good lad Brian Now could you help Basil with his problem. Quote Link to comment Share on other sites More sharing options...
MattyB Posted November 23, 2021 Share Posted November 23, 2021 (edited) 4 hours ago, Basil said: I am trying to get those who first put this subject on the forum and showed the circuits to come forth and let me know the details of the simple circuits they originally discussed. No names mentioned.I dont know enough about electronics to be sure I have the correct info, even though I have a strong interest in the subject. So to those who first discussed this, please can you give me some more details. If you only want answers from those people specifically then go to the original thread and PM them direct - this will avoid wasting peoples time in this thread. Alternatively just tag them here using the "@" symbol i.e. @Basil and they will be notified of this thread (assuming they are still actively using the forum). PS - If it is this thread you are talking about it's very old, not sure you are going to get a response... Edited November 23, 2021 by MattyB Quote Link to comment Share on other sites More sharing options...
Basil Posted November 23, 2021 Author Share Posted November 23, 2021 Matt, I am asking anybody to volunter info.So far there has only been excuses about not using a mosfet. Andy, I am aware of that. Looking at a 5/6s , over a 6s I would need a bit more than a basic cicuit because I am told possible voltage surge!. Bas 1 1 Quote Link to comment Share on other sites More sharing options...
MattyB Posted November 23, 2021 Share Posted November 23, 2021 8 minutes ago, Basil said: Matt, I am asking anybody to volunter info. In a post above you stated "I am trying to get those who first put this subject on the forum and showed the circuits to come forth and let me know the details of the simple circuits they originally discussed. No names mentioned.", so I posted two ways you can do that. I was just trying to help you achieve your goal. 8 minutes ago, Basil said: So far there has only been excuses about not using a mosfet. I don't see any excuses, just well reasoned responses stating the requirement for a heatsink and pointing out a MOSFET represents additional complexity and components to go wrong in your powertrain. For someone who stated at the outset "just to be sure I am not an expert in electronics!!!!!!!!!!!" and "I dont know enough about electronics to be sure I have the correct info" you seem quick to dismiss the views of those who are more knowledgeable... ? Over and out. Quote Link to comment Share on other sites More sharing options...
Dickw Posted November 23, 2021 Share Posted November 23, 2021 If you can't find out how to make your own MOSFET based switch, there are commercial items available (at a price!) https://www.jetimodel.com/katalog/main-switch/ Other brands are also available ? Dick 1 Quote Link to comment Share on other sites More sharing options...
Basil Posted November 23, 2021 Author Share Posted November 23, 2021 (edited) I am not out to dismiss other views/knowledge at all . If you look at most of the replies they seem not to be giving info about the mosfet subject but talking about why it should not be considered. If no one persues these subjects then they will never be discussed. I was not negating the statement about heat sinks I stated that I was aware of it. Dick, yes they seem a similar/same animal, dose not give a price as far as I can see. Bas Edited November 23, 2021 by Basil Quote Link to comment Share on other sites More sharing options...
Dickw Posted November 23, 2021 Share Posted November 23, 2021 22 minutes ago, Basil said: ................................... Dick, yes they seem a similar/same animal, dose not give a price as far as I can see. Bas Have a look down this page. These ones provide telemetry and offer remote switching when integrated with the Jeti system, so other brands may be cheaper. Dick Quote Link to comment Share on other sites More sharing options...
Basil Posted November 23, 2021 Author Share Posted November 23, 2021 Thanks Dick, unbelievable prices, now you know why I am looking at getting a circuit for the assembly of a mosfet set up my self. Bas Quote Link to comment Share on other sites More sharing options...
Dickw Posted November 23, 2021 Share Posted November 23, 2021 Some years ago I built a device to give me 200amps at low volts for testing current sensors. It was a simple setup using 10 NiMh cells in parallel, each switched by a MOSFET. I don't know if this circuit will be any help to you, but have attached it anyway. Dick 1 Quote Link to comment Share on other sites More sharing options...
Nigel R Posted November 23, 2021 Share Posted November 23, 2021 32 minutes ago, Basil said: If you look at most of the replies they seem not to be giving info about the mosfet subject but talking about why it should not be considered Perhaps there may be a reason for that. 1 Quote Link to comment Share on other sites More sharing options...
Frank Skilbeck Posted November 23, 2021 Share Posted November 23, 2021 17 minutes ago, Nigel R said: Perhaps there may be a reason for that. Not sure why they are available commercially, Hacker also do a range They are also nice as they incorporate the antiflash, whereas an arming plug, unless it has the built in resistor connect first, doesn't, so a high voltage system e.g. 4s and above the spark will damage the plug overtime. Quote Link to comment Share on other sites More sharing options...
Andy Stephenson Posted November 23, 2021 Share Posted November 23, 2021 There's a thread on this subject over here... https://www.rcgroups.com/forums/showthread.php?3016539-High-Power-MosFet&highlight=mosfet 1 Quote Link to comment Share on other sites More sharing options...
leccyflyer Posted November 23, 2021 Share Posted November 23, 2021 Maybe I'm missing something here but what is the Lipo embedded in the model for? Is it supplying power to the radio in a very large model or is it part of the power train in the model? Quote Link to comment Share on other sites More sharing options...
Basil Posted November 24, 2021 Author Share Posted November 24, 2021 Andy, thanks. This forum is one of those that I have been looking at.There was some past discussion about the circuits by persons who had knowledge regarding the subject. They also made suggestions.The copies I have of the diagrams are not good, and the wording can be understood in more than 1 way, thats why I am trying to get some fresh veiws about the subject. I was rather hoping that a knowledgable contributor would offer some advise so that the subject could be refined/explored a little. There is time yet. Thanks again Andy Bas Quote Link to comment Share on other sites More sharing options...
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