| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To accurately detect an electrical quantity in an electrical quantity detection sensor for detecting the electrical quantity of direct current by using a transformer. <P>SOLUTION: This electrical quantity detection sensor 1 comprises a detection resistance 11 and an auxiliary resistance 15 provided at a cable way 10 through which direct current I flows, a transformer 12 connected between any two points in the cable way 10 such that a primary coil 12a is connected in parallel with the detection resistance 11, a photoelectric element (switching element) 13b connected between the cable way 10 and the primary coil 12a such that it is connected in series with the primary coil 12a, which is made on-off at a predetermined frequency, and a signal processing section 14 outputting an electrical signal depending on the electrical quantity of direct current I, based on an electrical signal of alternating current generated at a secondary coil 12b of the transformer 12. The auxiliary resistance 15 is provided outside of the scope of the two points wherein the primary coil I connected, such that it is connected in series with the detection resistance 11, the primary coil 12a, and the photoelectric element 13b. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
