Re: SMPS blowing fuses, not semiconductors
CN2 goes to a multi winding fan motor. CN5 goes to the plasma generator. It is powered by the MOC3041 and a triac (Q8). PC2, the unknown photocoupler controls pin 2 of the MOC3041 i'd imagine since it's on the primary side.
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Re: SMPS blowing fuses, not semiconductors
The semiconductors I took out tested fine, the MOSFET wasn't shorted and the rectifier was fine as well.
The only semiconductors left is the triac driver the upper left hand corner, diodes and two voltage regulators (LM7805) (LM7815).
Tim
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Re: SMPS blowing fuses, not semiconductors
The pwm driver is removed and the fuse is fine....
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SMPS blowing fuses, not semiconductors
I have a SMPS from a Winix WAC9500 that keeps blowing the fuse. It had some obvious bulging 200 uF 200V main filter caps that were replaced with 250v ones, but that obviously didn't solve the issue.
The bridge rectifier was replaced (RS405M), the switching MOSFET was replaced (STP7NK80ZFP) and the fuse (a 2 amp slow blow fuse) is still blowing. It isn't taking anything out with it when it is blowing.
The MOSFET is controlled by a KA3842 PWM controller. Taking that out of circuit stops the fuse from blowing, so the problem isn't in the primary filtering, or the rectifier....Last edited by k8tek; 12-25-2018, 01:45 PM.
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Re: New Members - please post your introductions here
Hello from Ohio
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