| 摘要 |
<p>PURPOSE:To enable noise of a sensor to be eliminated by providing a pick-up coil on a cut core horizontally to a magnetic flux according to current to be measured, amplifying a signal from the coil to a same level as an induced noise of a Hall element and a lead wire, and then inverting a phase and adding it to a measurement current of a current sensor. CONSTITUTION:A pick-up coil 3 is wound by one turn on a cut core 1 horizontally to a magnetic flux which is generated due to current to be measured. A signal from the coil 3 is amplified to a same level as that of a noise which is induced at a Hall element 2 and a lead wire 5, its phase is inverted, it is added to a sensor output signal. This synthetic signal is a true signal component, thus enabling noise to be eliminated from the lead wire effectively and responsiveness to be improved extremely.</p> |
