KR960039796A

KR960039796A - Ring trip detection circuit

Info

Publication number: KR960039796A
Application number: KR1019950008441A
Authority: KR
Inventors: 임남국
Original assignee: 김주용; 현대전자산업 주식회사
Priority date: 1995-04-11
Filing date: 1995-04-11
Publication date: 1996-11-25

Abstract

본 발명은 착신가입자에 착신신호가 공급되는 동안에 전화기를 들었을때 후크상태를 정확히 검출하여 링신호에 의한 회로의 오동작을 막도록 한 링 트립 검출회로에 관한 것으로, 일반적으로 현재 사용되는 교환기의 링검출회로는 링 신호 도달시 가입자 정합회로부에서 후크상태를 정확히 검출하지 못하여, 전화기 핸드셋을 후크오프해도 가입자 정합회로에서 후크오프를 인지하지 못하거나, 후크오프를 하지 않았는데 핸드셋을 든것같이 인식을 함으로써, 오동작의 여지가 있어, 본 발명은 착신신호가 공급되는 동안에 후크상태를 정확히 검출하여 링신호에 의한 회로의 오동작을 방지토록, 링 발생신호의 교류성분을 차단하고, 후크 온오프상태를 정확히 감지할 수 있는 보조회로를 가입자 정합회로에 설치하는데, 구체적으로 설명하면 가입자 정합회로의 플러스입력을 전원전압에 따라 분배한 것을 기준전압으로 삼고, 이 기준전압은 링 공급회로에 중첩된 DC 전위에 따라 가변적이므로 교환기 전압이 바뀌어도 검출임계치가 변하지 않으며 스위칭용 트랜지스터가 턴 온/오프에 따라 마이너스 입력전위가 바뀌는 것을 이용한 것이다.The present invention relates to a ring trip detection circuit that detects a hook state accurately when a telephone is picked up while an incoming signal is supplied to an incoming subscriber, thereby preventing malfunction of the circuit due to a ring signal. The circuit fails to detect the hook state correctly at the subscriber matching circuit when the ring signal arrives, and it does not recognize the hookoff at the subscriber matching circuit even when the telephone handset is hooked off, or it recognizes the handset when it is not hooked off. There is a possibility, the present invention can accurately detect the hook state while the incoming signal is supplied to prevent the circuit malfunction due to the ring signal, to block the AC component of the ring generation signal, and accurately detect the hook on-off state Subsidiary circuit is installed in subscriber matching circuit. As the reference voltage, the positive input of the circuit is divided according to the power supply voltage, and the reference voltage is variable according to the DC potential superimposed on the ring supply circuit. Therefore, the detection threshold does not change even when the exchange voltage is changed, and the switching transistor is turned on / off. The negative input potential changes accordingly.

Description

Ring trip detection circuit

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제1도는 본 발명의 구성도이다.1 is a block diagram of the present invention.

Claims

A called number generator 10 generating a ring signal; Subscriber matching circuit unit 20 for detecting the on / off state of the hook by distributing the power supply voltage and inputting a constant reference voltage to the plus terminal, and inputting a variable voltage whose potential varies depending on the on / off of the transistor and comparing it with the reference voltage. Wow; A transistor (Q1) which maintains the turn-off state when the handset is not lifted and is turned on when the handset is lifted, and simultaneously adjusts the potential of the voltage input to the negative terminal of the subscriber matching circuit section 20; ; Capacitors C1 and C2 for suppressing AC voltage; A diode (D1) for protecting the subscriber matching circuit section 20 by preventing the input voltage of the voltage comparator from becoming higher than zero; A relay for transmitting and receiving a ring signal to a subscriber by contacting when it is determined to be in a hook-on state according to the control signal of the subscriber matching circuit unit 20, and turning off by stopping the ring signal when it is determined to be in a hook-off state. RL); A ring trip detection circuit comprising a voltage divider (R4, R5; R6, R7) and a circuit stabilizer (R1, R2, R3).

※ Note: The disclosure is based on the initial application.