| 摘要 |
<p>PURPOSE:To interrupt noise in both high frequency normal and common modes for a wider frequency band and also interrupt the noise which enters from any of the input end or output end and passes to the other end in both directions by additionally utilizing the core which shows less reduction of effective permeability at a high frequency or magnetic material such as magnetic sheet. CONSTITUTION:Two kinds of cores (7, 7' and 8, 8') consisting of a magnetic material which shows less deterioration of effective permeability at a high frequency are combined a closed magnetic path core (first core 5) passing through the primary and secondary windings (3, 3') having large effective permeability at a low frequency in accordance with the object input noise frequency. This transformer sufficiently interrupts the noise which enters from any side of input and output devices. Moreover, since the magnetic paths of windings for interrupting common mode noise and interrupting high frequency normal mode noise are separated (like 8 and 7, 8' and 7'), magnetic interference between windings can be prevented and moreover influence of radiated electromagnetic field generated from the winding can be prevented by covering the external circumference of opposed surface of each core with the electrostatic shield plate.</p> |
