| 摘要 |
A power supply transformer for telephone to be incorporated in an AC adapter as a power supply for a telephone. A bobbin used in a power supply transformer for a telephone is configured by taking insulation as well as an insulation distance into consideration and is partitioned into three winding frames with a plurality of flanges to configure. A primary side input coil, which is connected with a power supply for commercial use, is coiled at the coil portion of the bobbin, a secondary side output coil is coiled for charging at another coil portion, and a secondary side output coil is coiled for a telephone line at still another coil portion are deemed to serve for improvement in insulation and reservation of insulation distance mutually between the respective coils. The output coil on secondary side for telephone line functions as a supplying power of a modem of the telephone set via a rectifying portion so that the modem directly connected with the telephone line can maintain insulation as well as insulation distance. |
