| 摘要 |
<p>Power supply apparatus 50 has coupled transformer 54 that inputs and outputs a communication signal and capacitor 55 that has high impedance to a commercial power supply frequency and low impedance to a communication signal frequency. Capacitor 55 is connected between primary winding 54a of coupled transformer 54 and power reception terminal 51b. To both ends of capacitor 55, switching regulator 130 is connected via noise reduction circuit 140. To secondary winding 54b of coupled transformer 54, modem 120 of a power line communication apparatus is connected. In the configuration, coupled transformer 54 and switching regulator 130 are thus connected in series.</p> |
