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| General Electronics Chat This forum is for general chat about electronics, eg: Dont know what a part does? Dont know how to read a circuit? Want to get an opinion? |
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10th February 2005, 10:19 AM
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 Short circuit protection I have a 40-90V DC input driving some logic circuit.I am trying to protect the circuit by turning it off above 3 amps.I have checked some polyswitch fuses(have not found anything matching my requirement).I am also looking to implement it using a current sensor.I do not know how to proceed beyond this point , can anyone pls help. | |
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10th February 2005, 01:04 PM
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| More information required. What is the "logic circuit"? Why the high voltage? Does the "logic circuit" normally draw 3 amps? Sounds rather a lot. JimB | |
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10th February 2005, 07:57 PM
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| Will a current limit work? Or do you want to shut down at 3 amps? Is there other low voltage available?
__________________ see my website: www.geocities.com/russlk | |
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11th February 2005, 04:56 AM
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| The logic circuit has some mosfets driving a relay with pwm output. The load current is 2.5 Amps ( maximum of 3 amps) Any current limiter will do cutting off at 3 amps.There are no other low voltages.It is a little urgent Pls help. | |
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11th February 2005, 07:11 AM
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| I suggest you post the circuit of what you have, your request still doesn't make any real sense?. | |
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11th February 2005, 07:39 PM
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| Try putting this circuit in the return line. The IRF630 will get real hot when it current limits.
__________________ see my website: www.geocities.com/russlk | |
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