| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a current detector securing a signal accurately proportional to a circuit current, and linearity without influencing a measured circuit as the current detector used for overcurrent protection of a power element and a power converter. SOLUTION: In this current detector 1, a first conductive layer and a third conductive layer of a printed circuit board of three-layer structure are provided with a plurality of strip conductors 7 spaced at equal spaces, and the respective strip conductors are continuously and spirally connected through through-holes 9 to form a toroidal coil 5. A return conductor 11 is formed at a second conductive layer in the middle. One final end part of the coil 5 is led out as an A output terminal, while the other final end part is connected to one end of the return conductor 11, and a B output terminal is taken out of the other end of the return conductor 11.</p> |
