KR950004643Y1 - Current type transforming circuit for measurementof temperature - Google Patents
Current type transforming circuit for measurementof temperature Download PDFInfo
- Publication number
- KR950004643Y1 KR950004643Y1 KR2019900005332U KR900005332U KR950004643Y1 KR 950004643 Y1 KR950004643 Y1 KR 950004643Y1 KR 2019900005332 U KR2019900005332 U KR 2019900005332U KR 900005332 U KR900005332 U KR 900005332U KR 950004643 Y1 KR950004643 Y1 KR 950004643Y1
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- South Korea
- Prior art keywords
- differential amplifier
- resistor
- temperature
- inverting terminal
- temperature sensor
- Prior art date
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
- G01K7/14—Arrangements for modifying the output characteristic, e.g. linearising
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
- G01K7/20—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer in a specially-adapted circuit, e.g. bridge circuit
- G01K7/21—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer in a specially-adapted circuit, e.g. bridge circuit for modifying the output characteristic, e.g. linearising
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
내용 없음.No content.
Description
제1 도는 종래의 브리지형 온도감지 변환회로도.1 is a conventional bridge type temperature sensing conversion circuit diagram.
제 2 도는 본 고안 정전류형 온도감지 변환회로.2 is a constant current type temperature sensing conversion circuit of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
OP1, OP2 : 차동증폭기 RT: 온도감지기OP1, OP2: Differential amplifier R T : Temperature sensor
R1-R5 : 저항R1-R5: resistance
본 고안은 차동증폭기를 이용하여 온도를 정확하게 측정하기 위한 온도감지 변환회로에 관한 것으로, 특히 온도감지기에 정전류를 공급하여 온도변화에 따른 온도감지기의 저항변화량 및 온도를 정확하게 측정하도록 한 정전류형 온도감지 변환회로에 관한 것이다.The present invention relates to a temperature sensing conversion circuit for accurately measuring temperature by using a differential amplifier, and in particular, a constant current type temperature sensing to supply a constant current to the temperature sensor to accurately measure the resistance change and temperature of the temperature sensor according to the temperature change. It relates to a conversion circuit.
제 1 도는 온도를 감지하기 위해 온도감지기(RT)의 저항 변화를 전압으로 변환하는 것중 가장 일반적인 브리지형 온도감지 변환회로이다.1 is the most common bridge type temperature sensing conversion circuit of converting a resistance change of a temperature sensor R T into a voltage to sense a temperature.
여기서 온도의 변화에 의해 온도감지기(RT)의 저항값이 소정값(△RT)만큼 변화했을 때 출력단자(Vo)의 전압변화량은,Here, when the resistance value of the temperature sensor R T changes by a predetermined value ΔRT due to the change in temperature, the voltage change amount of the output terminal Vo is
로 변환된다. Is converted to.
상기 식에서 알 수 있듯이 출력전압의 변화량 △V와 온도감지기(RT)의 저항값 변화량 △RT의 관계는 선형성이 없다.As it can be seen wherein the relationship of the resistance change amount R △ T of the output voltage variation △ V and a temperature sensor (R T) of the there is no linearity.
즉, 출력전압의 변화량 △V와 온도감지기(RT)의 변화량 △RT의 관계가 선형성이 없으므로 차동증폭을 사용하는 아날로그 회로에서는 정확한 온도측정을 할 수 없는 문제점이 있었다.That is, there is a problem in the relationship between the amount of change △ R T of the output voltage variation △ V and a temperature sensor (R T) of which can not be the accurate temperature measurement in the analog circuit that there is no linearity using a differential amplifier.
본 고안은 이와 같은 종래의 문제점을 시정보완하기 위해 차동증폭기를 이용하여 온도감지기에 일정전류를 공급함과 아울러 차동증폭기의 반전단자에 일정전류를 공급한 상태에서 외부의 온도가 변화하게 되면 온도감지기의 저항값이 변화되어 차동증폭기의 반전단자에 인가된 일정전류와 변화된 정전류의 차에 의해 정확한 온도를 측정하도록 안출한 것으로, 이하 본 고안을 첨부된 도면에 의거 상세히 설명하면 다음과 같다.The present invention provides a constant current to the temperature sensor using a differential amplifier to solve such a conventional problem, and when the external temperature is changed while supplying a constant current to the inverting terminal of the differential amplifier, The resistance value is changed to measure the accurate temperature by the difference between the constant current and the changed constant current applied to the inverting terminal of the differential amplifier. Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
제 2 도는 본 고안 정전류형 온도감지 변환회로도로서, 이에 도시한 바와 같이 전원전압(V)단자를 저항(R1)을 통해 비반전단자(+)가 접지와 연결된 차동증폭기(OP1)의 반전단자(-)에 연결하고, 차동증폭기(OP1)의 출력단자를 직렬 연결된 온도감지기(RT)와 저항(R2)을 통해 차동증폭기(OP1)의 반전단자(-)에 연결함과 아울러 저항(R4)을 통해 차동증폭기(OP2)의 반전단자(-)에 연결하고, 상기 저항(R2)과 온도 감지기(RT)의 접속점은 저항(R3)을 통해 차동증폭기(OP2)의 비반전단자(+)에 연결하여 그 출력단자(Vo)를 저항(R5)을 통해 상기 차동증폭기(OP2)의 반전단자(-)에 연결하여 구성한 것으로, 이와 같이 구성된 본 고안의 작용, 효과를 상세히 설명하면 다음과 같다.2 is a circuit diagram of a constant current type temperature sensing device of the present invention, and as shown therein, an inverting terminal of a differential amplifier OP1 having a non-inverting terminal (+) connected to ground through a resistor R1 ( -) And the output terminal of the differential amplifier (OP1) to the inverting terminal (-) of the differential amplifier (OP1) through the temperature sensor (R T ) and the resistor (R2) connected in series, and to the resistor (R4). Connected to the inverting terminal (-) of the differential amplifier (OP2) through, and the connection point of the resistor (R2) and the temperature sensor (R T ) is connected to the non-inverting terminal (+) of the differential amplifier (OP2) through the resistor (R3) The output terminal Vo is connected to the inverting terminal (-) of the differential amplifier OP2 through the resistor R5. The operation and effect of the present invention thus constructed will be described in detail as follows. .
전원단자의 전압(V)이 저항(R1)을 통해 비반전단자(+)가 접지된 차동증폭기(OP1)의 반전단자(-)에 인가되면 차동증폭기(OP1)의 출력에서는 일정전압이 반전증폭되어 저항(R4)을 통해 차동증폭기(OP2)의 반전단자(-)에 인가됨과 아울러 온도감지기(RT) 및 저항(R2)을 통해 차동증폭기(OP1)의 반전단자(-)에 인가되고, 상기 저항(R2)과 온도감지기(RT)의 접속점에 인가되는 전압(V2)은 저항(R3)을 통해 차동증폭기(OP2)의 비반전단자(+)에 인가되므로 차동증폭기(OP2)에서는 온도감지기(RT)의 저항값 변화에 따른 전압(V2)과 저항(R4)을 통한 전압(V4)과의 차를 증폭하여 출력전압(Vo)단자로 출력하게 된다.When the voltage V of the power supply terminal is applied to the inverting terminal (-) of the differential amplifier OP1 having the non-inverting terminal (+) grounded through the resistor R1, the constant voltage is inverted at the output of the differential amplifier OP1. And is applied to the inverting terminal (-) of the differential amplifier OP2 through the resistor R4, and to the inverting terminal of the differential amplifier OP1 through the temperature sensor R T and the resistor R2. the resistance (R2) and the voltage (V2) applied to the connection point of the temperature sensor (R T) is so via a resistor (R3) is applied to the non-inverting terminal (+) of the differential amplifier (OP2) a differential amplifier (OP2) in the temperature The difference between the voltage V2 and the voltage V4 through the resistor R4 according to the change in the resistance value of the detector R T is amplified and output to the output voltage Vo terminal.
즉, 상기 저항(R2)과 온도감지기(RT)에 흐르는 전류(I)는로 일정하므로 저항(R2)을 0℃ 일때의 온도감지기(RT)의 저항값과 같게하면 온도감지기(RT)의 감지온도가 0℃일때 R2=RT이므로 차동증폭기(OP1)의 반전단자(-)에 인가된 전압(V1)과 저항(R2)에 인가된 전압(V2)과의 차는 온도감지기(RT)의 양단에 걸린 전압(V2)(V3)의 차와 같다. 즉 V1-V2=V2-V3가 된다. 따라서 차동증폭기(OP2)의 반전단자(-)에 인가된 전압(V4)은 온도감지기(RT)에 인가된 전압(V2)과 같고, 입력저항(R4)과 피드백저항(R5)이 같으므로 Vo-V4=V4-V3가 된다. 즉 V4=V2─① V1-V2=V2-V3─②, Vo-V4=V4-V3─③가 되고, 상기 식 ①②로 부터 ③식은 Vo-V2=V1-V2가 된다.That is, the current I flowing through the resistor R2 and the temperature sensor R T is Since constant as it is a sensed temperature of the resistor (R2) to 0 ℃ when the temperature sensor (R T) temperature sensor (R T) if equal to the resistance value of the 0 ℃ when R2 = R T-inverting terminal of the differential amplifier (OP1) The difference between the voltage V1 applied to the negative voltage and the voltage V2 applied to the resistor R 2 is equal to the difference between the voltages V2 and V3 across the temperature sensor R T. That is, V1-V2 = V2-V3. Therefore, the voltage V4 applied to the inverting terminal (-) of the differential amplifier OP2 is the same as the voltage V2 applied to the temperature sensor R T , and the input resistance R4 and the feedback resistor R5 are the same. Vo-V4 = V4-V3. That is, V4 = V2-V1-V2 = V2-V3-②, Vo-V4 = V4-V3-③, and from the above equations ① ②, the expressions Vo-V2 = V1-V2.
따라서 출력전압(Vo)은 입력전압(V1)과 같으므로 접지가 되어 출력전압(Vo)는 제로(Zero) 볼트가 된다.Therefore, since the output voltage Vo is equal to the input voltage V1, the output voltage Vo is grounded, and the output voltage Vo is zero volts.
온도감지기(RT)의 주변온도가 상승하여 온도감지기(RT)의 저항 값이 △R만큼 변화가 되면 V2-V3=V1-V2+△RI─①, V4=V2─②, Vo-V4=V4-V3─③이 성립한다.A temperature sensor (R T) close to the temperature increases by the temperature sensor (R T) when the resistance value is changed by a △ R of V2-V3 = V1-V2 + △ RI─①, V4 = V2─②, Vo-V4 = V4-V3─③ holds.
상기 ①식과 ②식으로 부터 ③식은 Vo=V1+△RI가 되고, 입력전압(V1)은 접지이므로 출력전압(Vo)은 RI가 되어 저항변화에 비레하게 된다.Equations (1) and (2) are expressed as Vo = V1 + ΔRI, and since the input voltage V1 is ground, the output voltage Vo becomes RI, which causes a change in resistance.
이와 같이 본 고안은 차동증폭기를 이용, 온도감지기에 흐르는 전류를 일정하게 공급하여 주므로써, 온도감지기의 저항변화에 비례한 출력전압을 얻을 수 있게 되어 차동증폭기를 사용한 아날로그 회로에서 정확한 저항변화를 측정할 수 있는 효과가 있다.As such, the present invention provides a constant current supply to the temperature sensor using a differential amplifier, so that an output voltage proportional to the resistance change of the temperature sensor can be obtained, thereby measuring accurate resistance change in an analog circuit using the differential amplifier. It can work.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019900005332U KR950004643Y1 (en) | 1990-04-27 | 1990-04-27 | Current type transforming circuit for measurementof temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019900005332U KR950004643Y1 (en) | 1990-04-27 | 1990-04-27 | Current type transforming circuit for measurementof temperature |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR910018707U KR910018707U (en) | 1991-11-29 |
| KR950004643Y1 true KR950004643Y1 (en) | 1995-06-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019900005332U KR950004643Y1 (en) | 1990-04-27 | 1990-04-27 | Current type transforming circuit for measurementof temperature |
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| Country | Link |
|---|---|
| KR (1) | KR950004643Y1 (en) |
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1990
- 1990-04-27 KR KR2019900005332U patent/KR950004643Y1/en not_active IP Right Cessation
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| Publication number | Publication date |
|---|---|
| KR910018707U (en) | 1991-11-29 |
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