公开(公告)号：JPH05122827A

公开(公告)日：1993-05-18

申请号：JP26972491

申请日：1991-10-17

Applicant: KOREA ELECTRONICS TELECOMM ,  KOREA TELECOMMUNICATION

Inventor： GAKU JIN CHIYOI ,  HOO YON KIMU ,  YON IRU KIMU ,  KIYUN HOO NOO ,  KII HON KIMU

IPC: H02H1/00 ,  H04B1/16 ,  H04B7/26 ,  H04M1/73

Abstract: PURPOSE: To provide an automatic power supply cutoff control device that can extend the life of a rechargeable battery and a communication time by automatically breaking a power supply, when a portable communication device is not receiving or transmitting data. CONSTITUTION: An automatic power supply cutoff control circuit consists of a first flip-flop 2 that is connected to the signal reception terminal of a communication device and is connected to a call-processing tone detector 1 for detecting a specific person that is provided by an exchanger for constantly applying power supply, a second flip-flop 6 that is connected to a talk terminal 4 being switched to an on state manually by a user, when the power supply is applied constantly and a transmission/reception signal is requested, and a transistor 8 that is connected to the output terminal of an AND gate 7 which is connected to the output terminal of the first and second flip-flops 2 and 6 and switches the power supply to be applied to the transmission terminal. The circuit detects a specific reception signal tone and breaks the power supply automatically.