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Post by peter g on Oct 10, 2015 6:25:02 GMT -8
hi gary and forum members. hope all is well. i'am testing the mosfet inverter. I found there was no b plus to the chips. did I miss a jumper? need input. thanks all. pg
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Post by Gary Lecomte on Oct 10, 2015 6:30:45 GMT -8
Yes there is B+, It is Supplied via a Diode, 2k7 resistor and a 13 volt Zener, With power Coming from One Side of T1. B+ is Pin 8 on IC1, Pin 14 on IC2.
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Post by peter g on Oct 10, 2015 6:47:49 GMT -8
good morning gary, yes I see it now. i'll check my circuit for a fault. thanks so much. pg
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Post by Gary Lecomte on Oct 10, 2015 6:52:34 GMT -8
The Main Reason for this Unusual Supply method: Is the Voltage from the Transformer is an AC Signal and Higher than the original 12 Volts. So it Supplies a Stable 13 Volts to the IC, Even if the battery Falls below 12 Volts when the Inverter is in Operation.
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Post by peter g on Oct 10, 2015 9:29:11 GMT -8
very cool. gary, I tried to email you recently, and had no luck. has your email address changed? I have a request for a new project. its a tester to test electronically commutated motors. there are several on the market, but I bet you can design one. regards,pg.
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Post by Gary Lecomte on Oct 10, 2015 13:08:43 GMT -8
No it has Not changed.
chemelec@hotmail.com
And Probably NOT, Since I don't have such a Motor to try it on.
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Post by peter g on Oct 10, 2015 14:15:54 GMT -8
the motor in question is almost exclusively used in home central a/c units. needless to say, they are numerous in s. florida. the cost to replace one is over $1000. having a problem getting my inverter to work. I've hooked it up using a 24vct 450ma transformer just for a test. B+ to chips is only 4v. what would be a good way to troubleshoot this circuit?
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Post by Gary Lecomte on Oct 10, 2015 14:34:04 GMT -8
Something definitely WRONG. Is this built on a Proper made PCB?
Want to Discuss this Easier than Typing, Email me your Phone Number.
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