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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Balance charge/BMS circuit problem starting handtools
Once upon a time on usenet Charlie+ wrote:
On Mon, 21 May 2018 18:22:34 +0100, Charlie+ wrote as underneath : On Mon, 21 May 2018 10:30:39 -0400, Bob Engelhardt wrote as underneath : On 5/20/2018 2:56 PM, Charlie+ wrote: ... so a bypass switch would be a bit of a nuisance, any simple better ideas in your drawer!? ... A brute force approach would be to use a time delay relay to connect the battery directly to the fan (through the switch, of course). NC at start & then opens a couple of seconds later. You'd have to test whether the relay in parallel with the BMS would be enough off-load. Or, it could probably be done with a honking big BJT that has its base biased with a capacitor that's charged in the off time and then discharged through the base in a few seconds when on. But I'm much too transistor illiterate to be more specific. Try S.E.Basics or S.E.Design if you don't get help here. OK Bob thanks for thaughts, think I might just have a start button and release once running. Thats cheap and cheerful, Ill report if it works ok. C+ Ok Done and dusted - instant-on press button works fine (just bypasses the BMS negative on startup) - time will tell if it keeps on happily trucking! Thanks for help everyone... C+ That's what I did when I converted a battery powered rotary tool from 3 x NiMH to an 18650 and the charge controller / battery protection module did the same as you're reporting. My system also worked fine. -- Shaun. "Humans will have advanced a long, long way when religious belief has a cozy little classification in the DSM*." David Melville (in r.a.s.f1) (*Diagnostic and Statistical Manual of Mental Disorders) |
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