KR960018596A - Disconnection detection circuit of analog input signal - Google Patents

Disconnection detection circuit of analog input signal Download PDF

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Publication number
KR960018596A
KR960018596A KR1019940031018A KR19940031018A KR960018596A KR 960018596 A KR960018596 A KR 960018596A KR 1019940031018 A KR1019940031018 A KR 1019940031018A KR 19940031018 A KR19940031018 A KR 19940031018A KR 960018596 A KR960018596 A KR 960018596A
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KR
South Korea
Prior art keywords
disconnection detection
unit
detection circuit
disconnection
voltage
Prior art date
Application number
KR1019940031018A
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Korean (ko)
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KR0172803B1 (en
Inventor
오연식
Original Assignee
이희종
엘지산전 주식회사
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Priority to KR1019940031018A priority Critical patent/KR0172803B1/en
Publication of KR960018596A publication Critical patent/KR960018596A/en
Application granted granted Critical
Publication of KR0172803B1 publication Critical patent/KR0172803B1/en

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  • Amplifiers (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)

Abstract

본 발명은 아날로그 전압신호의 입력부 중 온도센서 또는 외부 보상도선의 단선을 검출하는데 적당한 아날로그 입력신호 단선검출회로에 관한 것으로 특히, 기존의 단선검출회로에 설치된 아날로그 전압 입력부는 상기 열전대 신호 전송부의 두 출력단에 두개의 저항(R1,R2)을 각각 직렬 연결시켜 구성하고, 상기 단선검출 회로부는 증폭회로부의 정극성 입력단자(+)와 기준전압(Vr) 사이에 두개의 직렬 저항(R3,R4)을 연결하고 이 저항(R3,R4)의 접속점은 분압저항(R5)을 통해 접지에 연결하며 상기 증폭회로부의 부극성입력단자(-)는 단선검출용 저항(R6)을 통해 접지시키는 구성으로 형성시켜 기준전압에 의해 발생되는 오차전압을 최소로 줄일 수 있도록 하므로써 제품의 신뢰도를 대폭 향상시킬 수 있는 것이다.The present invention relates to an analog input signal disconnection detection circuit suitable for detecting disconnection of a temperature sensor or an external compensation wire among the input parts of an analog voltage signal. In particular, an analog voltage input unit installed in an existing disconnection detection circuit is provided at two output terminals of the thermocouple signal transmitter. Two resistors R1 and R2 are connected in series to each other, and the disconnection detecting circuit unit connects two series resistors R3 and R4 between the positive input terminal (+) and the reference voltage Vr of the amplifying circuit unit. The connection points of the resistors R3 and R4 are connected to the ground through the voltage divider R5, and the negative input terminal (-) of the amplification circuit part is grounded through the disconnection detection resistor R6. By reducing the error voltage generated by the reference voltage to a minimum, the reliability of the product can be greatly improved.

Description

아날로그 입력신호의 단선검출회로Disconnection detection circuit of analog input signal

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

제2도는 본 발명의 단선검출 회로도,2 is a disconnection detection circuit diagram of the present invention;

제3도는 본 발명을 설명하기 위한 단선검출 인지 프로그램 플로우챠트.3 is a flow chart detecting program flow chart for explaining the present invention.

Claims (1)

열전대와 보상도선으로 이루어진 열전대 신호 전송부와; 상기 열전대 신호 전송부의 출력전압을 입력받는 아날로그 전압 입력부와; 열전대 및 보상도선의 단선유무를 검출하는 단선검출 회로부와; 상기 단선검출 회로부의 출력신호를 소정레벨로 증폭시켜 출력전압(Vo)을 발생시켜 주는 증폭회로부와; 상기 증폭회로부의 출력전압을 14비트의 디지탈신호로 변환시켜 주는 아날로그/디지탈 변환부와; 상기 아날로그/디지탈 변환부의 출력신호를 입력받아 소정프로그램을 통해 처리한 후 PLC 본체와 변환결과를 주고받는 마이컴으로 구성된 단선 검출회로에 있어서, 상기 아날로그 전압 입력부는 상기 열전대 신호 전송부의 두 출력단에 두개의 저항(R1,R2)을 각각 직렬 연결시켜 구성하고, 상기 단선검출 회로부는 증폭회로부의 정극성 입력단자(+)와 기준전압(Vr) 사이에 두개의 직렬 저항(R3,R4)을 연결하고 이 저항(R3,R4)의 접속점은 분압저항(R5)을 통해 접지에 연결하며 상기 증폭회로부의 부극성 입력단자(-)는 단성검출용 저항(R6)을 통해 접지시켜서 된 것을 특징으로 하는 아날로그 입력신호의 단선검출회로.A thermocouple signal transmitter comprising a thermocouple and a compensation wire; An analog voltage input unit configured to receive an output voltage of the thermocouple signal transmitter; A disconnection detection circuit unit for detecting presence or absence of disconnection of the thermocouple and the compensation conductor; An amplifying circuit section for generating an output voltage Vo by amplifying the output signal of the disconnection detecting circuit section to a predetermined level; An analog / digital conversion unit for converting an output voltage of the amplifying circuit unit into a 14-bit digital signal; In the disconnection detection circuit comprising a microcomputer that receives the output signal of the analog / digital conversion unit and processes it through a predetermined program and exchanges the conversion result with the PLC main body, wherein the analog voltage input unit is provided at two output terminals of the thermocouple signal transmission unit. The resistor R1 and R2 are connected in series, and the disconnection detection circuit unit connects two series resistors R3 and R4 between the positive input terminal (+) and the reference voltage Vr of the amplifying circuit unit. The connection points of the resistors R3 and R4 are connected to the ground through the voltage divider R5, and the negative input terminal (-) of the amplification circuit part is grounded through the resistor R6 for detecting the unit. Disconnection detection circuit of signal. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019940031018A 1994-11-24 1994-11-24 Disconnection detection circuit for analog input signal KR0172803B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019940031018A KR0172803B1 (en) 1994-11-24 1994-11-24 Disconnection detection circuit for analog input signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019940031018A KR0172803B1 (en) 1994-11-24 1994-11-24 Disconnection detection circuit for analog input signal

Publications (2)

Publication Number Publication Date
KR960018596A true KR960018596A (en) 1996-06-17
KR0172803B1 KR0172803B1 (en) 1999-03-30

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KR1019940031018A KR0172803B1 (en) 1994-11-24 1994-11-24 Disconnection detection circuit for analog input signal

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10627438B2 (en) 2015-12-23 2020-04-21 Mando-Hella Electronics Corporation Circuit fault detection system and control method thereof

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170003757U (en) 2016-04-22 2017-11-01 최해용 High-definition 2D/3D Combination Projector Systemm

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10627438B2 (en) 2015-12-23 2020-04-21 Mando-Hella Electronics Corporation Circuit fault detection system and control method thereof

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