POWER SUPPLY ADAPTER DEVICE

摘要

PROBLEM TO BE SOLVED: To make it possible to supply DC power even to different kinds of communication equipments by using such a mechanism that a necessary DC power supply and connection adapter are automatically selected and DC power is supplied to a communication equipment by using a controlling circuit. SOLUTION: A relay driving circuit (1) 5 receives a signal from a controlling circuit 3 and then connects a connector (b) 23 to a DC power supply and tltereby power is supplied to a relay (B) 8 from the DC power supply. Therefore, a contact (B) 14 which is a contact of the relay (B) 8 closes as shown by a dot line and thereby one end of a cable 28 is connected to the connector (b) 23. A relay driving circuit (2) 6 receives a signal from the controlling circuit 3 and then connects a connector to the DC power supply 20 and thereby power is supplied to a relay contact (E) 11. Therefore, a contact (E) 17 which is a contact of the relay (E) 11 closes as shown by a dot line. When the relay contact (E) 17 closes, the other end of the cable 28 is connected to the DC power supply.