| 摘要 |
<p>PROBLEM TO BE SOLVED: To make precisely measurable any directional current to be measured in a current sensor operated by the supply of a single power source. SOLUTION: When a current to be measured Iin is made to flow to an input coil 15, a magnetic flux is generate within a magnetic core 10, and a potential difference is caused between a pair of output terminals 14L and 14R provided on a Hall element 12. This potential difference is inputted to a pair of operational amplifiers 20 V and 20 W having a positive voltage Vcc received in the power source terminals. Since both the operational amplifiers 20 V and 20 W have reverse input polarities, only one operational amplifier 20 V takes this voltage potential as a positive input signal and outputs a positive voltage. The operational amplifier 20 V is operated so as to make a current flow to an output coil 21 V and a resistor 22 V so that the potential difference between both the input terminals is 0 V. The voltage Vout at one end of the resistor 22 to which this current Iout is carried is outputted from a sensor output terminal 23 V as a detection signal.</p> |
