How does a Hall-based wattmeter work?












0












$begingroup$


I read about the Hall effect and understand its usage in sensors like speedometers, but I also read it can be used as a wattmeter. How can it happen?



In order to calculate power (P) we need to multiply voltage and current.



How does a Hall sensor do that?










share|improve this question











$endgroup$

















    0












    $begingroup$


    I read about the Hall effect and understand its usage in sensors like speedometers, but I also read it can be used as a wattmeter. How can it happen?



    In order to calculate power (P) we need to multiply voltage and current.



    How does a Hall sensor do that?










    share|improve this question











    $endgroup$















      0












      0








      0





      $begingroup$


      I read about the Hall effect and understand its usage in sensors like speedometers, but I also read it can be used as a wattmeter. How can it happen?



      In order to calculate power (P) we need to multiply voltage and current.



      How does a Hall sensor do that?










      share|improve this question











      $endgroup$




      I read about the Hall effect and understand its usage in sensors like speedometers, but I also read it can be used as a wattmeter. How can it happen?



      In order to calculate power (P) we need to multiply voltage and current.



      How does a Hall sensor do that?







      sensor watts hall-effect power-meter power-measurement






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Jan 20 at 15:21









      Peter Mortensen

      1,60031422




      1,60031422










      asked Jan 20 at 12:48









      Pooya EstakhriPooya Estakhri

      1456




      1456






















          1 Answer
          1






          active

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          3












          $begingroup$

          You are correct that for power measurement both voltage and current must be measured.



          enter image description here



          Figure 1. Hall effect measurement setup for electrons. Initially, the electrons follow the curved arrow, due to the magnetic force. At some distance from the current-introducing contacts, electrons pile up on the left side and deplete from the right side, which creates an electric field ξy in the direction of the assigned VH. VH is negative for some semiconductors where "holes" appear to flow. In steady-state, ξy will be strong enough to exactly cancel out the magnetic force, thus the electrons follow the straight arrow (dashed). Source: Wikipedia Hall effect.



          The Hall sensor provides a means of non-contact current measurement.



          enter image description here



          Figure 2. A typical current sensing arrangement of a Hall sensor in a torroidal core around the conductor. Source: Digikey.



          The energy meter will require a voltage measurement as well.



          For DC the instantaneous power can be calculated as the product of the voltage and current. For AC it is necessary to continuously sample the voltage and current, get the product and then calculate the average of the power over time. Mathematically, $ int_0^T VIdt $.






          share|improve this answer









          $endgroup$













          • $begingroup$
            Hmmm, i still don't understand how the circuit is going to be for using hall effect as a wattmeter ? where to do we measure to get amount of power?
            $endgroup$
            – Pooya Estakhri
            Jan 20 at 13:33






          • 1




            $begingroup$
            You measure the voltage, measure the current and multiply them either in analog electronics or with a digital circuit. The Open Energy Monitor project may be of interest to your.
            $endgroup$
            – Transistor
            Jan 20 at 16:23






          • 2




            $begingroup$
            A Hall Effect sensor can be used IN a wattmeter, but not AS a wattmeter. The Hall sensor would be used to measure current, and another sensor used to measure voltage, then a microcontroller would multiply the current and voltage measurements to get power.
            $endgroup$
            – Peter Bennett
            Jan 20 at 16:44











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          1 Answer
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          1 Answer
          1






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          3












          $begingroup$

          You are correct that for power measurement both voltage and current must be measured.



          enter image description here



          Figure 1. Hall effect measurement setup for electrons. Initially, the electrons follow the curved arrow, due to the magnetic force. At some distance from the current-introducing contacts, electrons pile up on the left side and deplete from the right side, which creates an electric field ξy in the direction of the assigned VH. VH is negative for some semiconductors where "holes" appear to flow. In steady-state, ξy will be strong enough to exactly cancel out the magnetic force, thus the electrons follow the straight arrow (dashed). Source: Wikipedia Hall effect.



          The Hall sensor provides a means of non-contact current measurement.



          enter image description here



          Figure 2. A typical current sensing arrangement of a Hall sensor in a torroidal core around the conductor. Source: Digikey.



          The energy meter will require a voltage measurement as well.



          For DC the instantaneous power can be calculated as the product of the voltage and current. For AC it is necessary to continuously sample the voltage and current, get the product and then calculate the average of the power over time. Mathematically, $ int_0^T VIdt $.






          share|improve this answer









          $endgroup$













          • $begingroup$
            Hmmm, i still don't understand how the circuit is going to be for using hall effect as a wattmeter ? where to do we measure to get amount of power?
            $endgroup$
            – Pooya Estakhri
            Jan 20 at 13:33






          • 1




            $begingroup$
            You measure the voltage, measure the current and multiply them either in analog electronics or with a digital circuit. The Open Energy Monitor project may be of interest to your.
            $endgroup$
            – Transistor
            Jan 20 at 16:23






          • 2




            $begingroup$
            A Hall Effect sensor can be used IN a wattmeter, but not AS a wattmeter. The Hall sensor would be used to measure current, and another sensor used to measure voltage, then a microcontroller would multiply the current and voltage measurements to get power.
            $endgroup$
            – Peter Bennett
            Jan 20 at 16:44
















          3












          $begingroup$

          You are correct that for power measurement both voltage and current must be measured.



          enter image description here



          Figure 1. Hall effect measurement setup for electrons. Initially, the electrons follow the curved arrow, due to the magnetic force. At some distance from the current-introducing contacts, electrons pile up on the left side and deplete from the right side, which creates an electric field ξy in the direction of the assigned VH. VH is negative for some semiconductors where "holes" appear to flow. In steady-state, ξy will be strong enough to exactly cancel out the magnetic force, thus the electrons follow the straight arrow (dashed). Source: Wikipedia Hall effect.



          The Hall sensor provides a means of non-contact current measurement.



          enter image description here



          Figure 2. A typical current sensing arrangement of a Hall sensor in a torroidal core around the conductor. Source: Digikey.



          The energy meter will require a voltage measurement as well.



          For DC the instantaneous power can be calculated as the product of the voltage and current. For AC it is necessary to continuously sample the voltage and current, get the product and then calculate the average of the power over time. Mathematically, $ int_0^T VIdt $.






          share|improve this answer









          $endgroup$













          • $begingroup$
            Hmmm, i still don't understand how the circuit is going to be for using hall effect as a wattmeter ? where to do we measure to get amount of power?
            $endgroup$
            – Pooya Estakhri
            Jan 20 at 13:33






          • 1




            $begingroup$
            You measure the voltage, measure the current and multiply them either in analog electronics or with a digital circuit. The Open Energy Monitor project may be of interest to your.
            $endgroup$
            – Transistor
            Jan 20 at 16:23






          • 2




            $begingroup$
            A Hall Effect sensor can be used IN a wattmeter, but not AS a wattmeter. The Hall sensor would be used to measure current, and another sensor used to measure voltage, then a microcontroller would multiply the current and voltage measurements to get power.
            $endgroup$
            – Peter Bennett
            Jan 20 at 16:44














          3












          3








          3





          $begingroup$

          You are correct that for power measurement both voltage and current must be measured.



          enter image description here



          Figure 1. Hall effect measurement setup for electrons. Initially, the electrons follow the curved arrow, due to the magnetic force. At some distance from the current-introducing contacts, electrons pile up on the left side and deplete from the right side, which creates an electric field ξy in the direction of the assigned VH. VH is negative for some semiconductors where "holes" appear to flow. In steady-state, ξy will be strong enough to exactly cancel out the magnetic force, thus the electrons follow the straight arrow (dashed). Source: Wikipedia Hall effect.



          The Hall sensor provides a means of non-contact current measurement.



          enter image description here



          Figure 2. A typical current sensing arrangement of a Hall sensor in a torroidal core around the conductor. Source: Digikey.



          The energy meter will require a voltage measurement as well.



          For DC the instantaneous power can be calculated as the product of the voltage and current. For AC it is necessary to continuously sample the voltage and current, get the product and then calculate the average of the power over time. Mathematically, $ int_0^T VIdt $.






          share|improve this answer









          $endgroup$



          You are correct that for power measurement both voltage and current must be measured.



          enter image description here



          Figure 1. Hall effect measurement setup for electrons. Initially, the electrons follow the curved arrow, due to the magnetic force. At some distance from the current-introducing contacts, electrons pile up on the left side and deplete from the right side, which creates an electric field ξy in the direction of the assigned VH. VH is negative for some semiconductors where "holes" appear to flow. In steady-state, ξy will be strong enough to exactly cancel out the magnetic force, thus the electrons follow the straight arrow (dashed). Source: Wikipedia Hall effect.



          The Hall sensor provides a means of non-contact current measurement.



          enter image description here



          Figure 2. A typical current sensing arrangement of a Hall sensor in a torroidal core around the conductor. Source: Digikey.



          The energy meter will require a voltage measurement as well.



          For DC the instantaneous power can be calculated as the product of the voltage and current. For AC it is necessary to continuously sample the voltage and current, get the product and then calculate the average of the power over time. Mathematically, $ int_0^T VIdt $.







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Jan 20 at 13:00









          TransistorTransistor

          84.5k784181




          84.5k784181












          • $begingroup$
            Hmmm, i still don't understand how the circuit is going to be for using hall effect as a wattmeter ? where to do we measure to get amount of power?
            $endgroup$
            – Pooya Estakhri
            Jan 20 at 13:33






          • 1




            $begingroup$
            You measure the voltage, measure the current and multiply them either in analog electronics or with a digital circuit. The Open Energy Monitor project may be of interest to your.
            $endgroup$
            – Transistor
            Jan 20 at 16:23






          • 2




            $begingroup$
            A Hall Effect sensor can be used IN a wattmeter, but not AS a wattmeter. The Hall sensor would be used to measure current, and another sensor used to measure voltage, then a microcontroller would multiply the current and voltage measurements to get power.
            $endgroup$
            – Peter Bennett
            Jan 20 at 16:44


















          • $begingroup$
            Hmmm, i still don't understand how the circuit is going to be for using hall effect as a wattmeter ? where to do we measure to get amount of power?
            $endgroup$
            – Pooya Estakhri
            Jan 20 at 13:33






          • 1




            $begingroup$
            You measure the voltage, measure the current and multiply them either in analog electronics or with a digital circuit. The Open Energy Monitor project may be of interest to your.
            $endgroup$
            – Transistor
            Jan 20 at 16:23






          • 2




            $begingroup$
            A Hall Effect sensor can be used IN a wattmeter, but not AS a wattmeter. The Hall sensor would be used to measure current, and another sensor used to measure voltage, then a microcontroller would multiply the current and voltage measurements to get power.
            $endgroup$
            – Peter Bennett
            Jan 20 at 16:44
















          $begingroup$
          Hmmm, i still don't understand how the circuit is going to be for using hall effect as a wattmeter ? where to do we measure to get amount of power?
          $endgroup$
          – Pooya Estakhri
          Jan 20 at 13:33




          $begingroup$
          Hmmm, i still don't understand how the circuit is going to be for using hall effect as a wattmeter ? where to do we measure to get amount of power?
          $endgroup$
          – Pooya Estakhri
          Jan 20 at 13:33




          1




          1




          $begingroup$
          You measure the voltage, measure the current and multiply them either in analog electronics or with a digital circuit. The Open Energy Monitor project may be of interest to your.
          $endgroup$
          – Transistor
          Jan 20 at 16:23




          $begingroup$
          You measure the voltage, measure the current and multiply them either in analog electronics or with a digital circuit. The Open Energy Monitor project may be of interest to your.
          $endgroup$
          – Transistor
          Jan 20 at 16:23




          2




          2




          $begingroup$
          A Hall Effect sensor can be used IN a wattmeter, but not AS a wattmeter. The Hall sensor would be used to measure current, and another sensor used to measure voltage, then a microcontroller would multiply the current and voltage measurements to get power.
          $endgroup$
          – Peter Bennett
          Jan 20 at 16:44




          $begingroup$
          A Hall Effect sensor can be used IN a wattmeter, but not AS a wattmeter. The Hall sensor would be used to measure current, and another sensor used to measure voltage, then a microcontroller would multiply the current and voltage measurements to get power.
          $endgroup$
          – Peter Bennett
          Jan 20 at 16:44


















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