| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a universal DC current sensor that can measure not only the absolute value of a DC current that flows to a conductor to be detected but also the direction of the DC current using an extremely simple detection circuit and achieves a breaker built-in type where a detection core part and a detection circuit part are formed in one piece. SOLUTION: When a DC current I flows to a conductor 1 to be detected, a magnetic fluxΦ0 is generated in the periphery direction of a detection core 51 as indicated by a black arrow in A. When a pulse current is applied to an excitation coil 53, a magnetic fluxΦEX that changes alternately in a direction that is indicated by a black arrow in B and C within the detection core 51, namely the orthogonally crossed direction for the periphery direction of the detection core 51 is generated by the plus (+) and the minus (-) of the pulse current, thus breaking a magnetic path due to the magnetic fluxΦ0 periodically. More specifically, the magnetic fluxΦ0 that is generated in the periphery direction of the detection core 51 due to a DC current I that flows to the conductor 1 to be detected is modulated by the magnetic fluxΦEX and a voltage (electromotive force) VDET due to the modulation of the magnetic fluxΦ0 is outputted to a detection coil 54 in the same pattern as that of a pulse current being applied.</p> |
