| 摘要 |
PURPOSE:To obtain an exchange device utilizing the power and enabling the stably ringing of the telephone set by charging the battery while converting a ringer signal into the DC voltage and stopping charging when ringing SLT is increased. CONSTITUTION:Ringer signals generated in a ringer signal generator 2 is converted into the DC voltage by a rectifier circuit 4 and a smoothing circuit 5. The charge current by the DC voltage is entered in a charge circuit 6. A backup battery 12 is charged by the circuit 6 which is normally turned on. Then a central control section (CC) 8 counts a ringing individual line station (SLT) 1, and when the count amounts to the reference value, notifies it to a charge control section 7. Thus, the control section 7 turns off the circuit 6 to stop the flow of the charge current. Thus, the battery 12 is normally charged with the ringer signal and the charging is stopped when the ringing SLT is increased, resulting in providing the exchange device utilizing the power and enabling the stable ringing of the telephone set. |
