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Old 19th January 2007, 06:39 AM   #1
sss is offline sss  Israel
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Default current sensing for high voltage supply

how can i sense the current of a high voltage line ?
transformer is not an option - dc ...
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Old 19th January 2007, 06:44 AM   #2
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Hall effect sensor based, so it measures AC/DC/Whatever. Output is microcontroller friendly.
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Old 19th January 2007, 07:09 AM   #3
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Old 19th January 2007, 08:04 AM   #4
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Default Re: current sensing for high voltage supply

Quote:
Originally posted by sss
how can i sense the current of a high voltage line ?
transformer is not an option - dc ...

linear optocoupler?

Jan Didden
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Old 19th January 2007, 08:52 AM   #5
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Couldn't you just insert a small sense resistor in series with the ground lead?
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Old 19th January 2007, 10:13 AM   #6
sss is offline sss  Israel
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thanx guys, hall effect is the word i was looking for
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Old 19th January 2007, 02:25 PM   #7
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Quote:
Originally posted by sss
thanx guys, hall effect is the word i was looking for

What range of current are you trying to measure?

Jan Didden
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Old 19th January 2007, 02:38 PM   #8
sss is offline sss  Israel
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Quote:
Originally posted by janneman



What range of current are you trying to measure?

Jan Didden
few amps @ 250V

Eva:
i can use sense resistor , but not with the ground lead , only with the Vcc lead
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Old 19th January 2007, 03:20 PM   #9
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i had decided to use a 0.01r/5w at +vcc at a cost of increase of ripple at mosfet positive rail of my h bridge.But i think the sense resistor is somewhat inductive.My pcb is ready but in the future i will try other elegant solution .
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Old 19th January 2007, 03:21 PM   #10
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sss, have you checked Allegros current sensors?
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