voltage monitoring
in [Design]
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From: john1987 on 12 Jul 2010 10:33 Hi, I got 2A flowing through a coil and about 200 volts peak to peak across it. I need to monitor this voltage and keep it constant. I am thinking some kind of digital feedback system that can not only monitor this voltage but also keep it constant. Now, I need to step down this 200 volts to about 5 volts peak to peak and then connvert it into its DC equivalent value inorder to monitor it with the help of microprocessor and then if there is a drop of voltage across the coil then compensate it using some circuitry. Are there any opamp available that can work on +/- 200 volts power supply with some programmable gain that can lower this voltage to lower voltage range. Would a step down transformer be a good option to go with? or how about a series of voltage divder circuitries? Any suggestions on how to solve this problem. John
From: who where on 12 Jul 2010 11:31 On Mon, 12 Jul 2010 07:33:47 -0700 (PDT), john1987 <conphiloso(a)hotmail.com> wrote: >Hi, > >I got 2A flowing through a coil and about 200 volts peak to peak >across it. I need to monitor this voltage and keep it constant. I am >thinking some kind of digital feedback system that can not only >monitor this voltage but also keep it constant. > >Now, I need to step down this 200 volts to about 5 volts peak to peak >and then connvert it into its DC equivalent value inorder to monitor >it with the help of microprocessor and then if there is a drop of >voltage across the coil then compensate it using some circuitry. > >Are there any opamp available that can work on +/- 200 volts power >supply with some programmable gain that can lower this voltage to >lower voltage range. > >Would a step down transformer be a good option to go with? or how >about a series of voltage divder circuitries? > >Any suggestions on how to solve this problem. Presuming that it is the current through the coil that you require to maintain constant, I'd be thinking of a current transformer as the first step.
From: john1987 on 12 Jul 2010 11:38 Hi, Would you please explain in more details about it. How would a current transformer be effective? Can you recommend one? What is the chances of putting a series of voltage dividers to get 200 volts downto 5 volts peak to peak and then use a brdidge rectifer to get the DC voltage output? A re there any high input instrument amplifiers available that can with programmable gain that can do this? Thanks John
From: John Larkin on 12 Jul 2010 11:59 On Mon, 12 Jul 2010 08:38:57 -0700 (PDT), john1987 <conphiloso(a)hotmail.com> wrote: >Hi, > >Would you please explain in more details about it. How would a current >transformer be effective? Can you recommend one? What is the chances >of putting a series of voltage dividers to get 200 volts downto 5 >volts peak to peak and then use a brdidge rectifer to get the DC >voltage output? A re there any high input instrument amplifiers >available that can with programmable gain that can do this? > >Thanks >John What's the frequency? Power? Signal source? Is one end grounded? Accuracy requirement? What's the application? John
From: john1987 on 12 Jul 2010 12:13
hi, Frequency is 300KHz. 200 peak to peak times 2A. Signal source is HIP 4081 driving four MOSFETS. The other end is not grounded. Accuracy requirent not known yet. John |