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Power supply circuit part overheating

jaomadn

Aug 23, 2013
2
Joined
Aug 23, 2013
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Hi,

I had this project a wireless remote controlled switch/AC outlet. After i finish my project which is workng fine tested on low powered devices "light bulb, hand drill". After i plug the Refrigerator its working fine. the problem happens when i plug the my water pump motor which i believe its around 1/2 or 1/4 Horse Power "Sorry i dont have the Electric Spec". The electronics gone no power to the reciever and the power supply for the receiver which is 220V to 12V center tap fullwave 1Amp Transformer , which i build my self is overheating. I tested the output of the PS 12V going to the receiver and its gone. Now the Powersupply circuit "capacitor/zener diode" overheat also. The 12V power supply source which is 220V is directly parallel to the Water Pump or the 3 "AC Female socket" I controlled the 1 line AC through the relay on the reciever and used the normally closed so when i activate the remote the power will cut-off and the socket or any load will turn off. I had some questions. 1.) what cause to my 12V powersupply overheat or damage 2.) Is it the water pump that drawn more current that damage the Power supply circuit. 3.) If the High Power Water pump caused the problem how to prevent it the next time. Something like "Do i need some protector in the middle of the 220-12V Transformer and the water pump line. 4.) Can someone had a better idea to solve my problem.
 

CDRIVE

Hauling 10' pipe on a Trek Shift3
May 8, 2012
4,960
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Welcome to Electronics Point. We are always happy to help but we speak schematic here. Please post yours. ;)

Chris
 

jaomadn

Aug 23, 2013
2
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Aug 23, 2013
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Please see attach photos of the project and schematic
 

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davenn

Moderator
Sep 5, 2009
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Sep 5, 2009
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OK the zener should not be wired directly across the output of the supply
am nit surprised its getting hot, it will be probably passing significant current

the normal practice is to have a resistor in series on the positive leg after the cap

have a look here for how to use zener diodes


cheers
Dave
 
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