KR930004428Y1 - Temperature detection circuit using RTD sensor - Google Patents
Temperature detection circuit using RTD sensor Download PDFInfo
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- KR930004428Y1 KR930004428Y1 KR2019900017983U KR900017983U KR930004428Y1 KR 930004428 Y1 KR930004428 Y1 KR 930004428Y1 KR 2019900017983 U KR2019900017983 U KR 2019900017983U KR 900017983 U KR900017983 U KR 900017983U KR 930004428 Y1 KR930004428 Y1 KR 930004428Y1
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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
- G01K7/16—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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K2219/00—Thermometers with dedicated analog to digital converters
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Abstract
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Description
제1도는 종래의 마이크로 컴퓨터를 이용한 온도 검출 회로도.1 is a temperature detection circuit diagram using a conventional microcomputer.
제2도는 본 고안을 설명하기 위해 나타낸 기능별 블록도.Figure 2 is a functional block diagram shown to illustrate the present invention.
제3도는 본 고안의 RTD센서를 이용한 온도 검출회로와 1칩 마이크로 컴퓨터의 상세도.3 is a detailed view of a temperature detection circuit and a 1-chip microcomputer using the RTD sensor of the present invention.
본 고안은 RTD 온도센서를 이용한 온도검출회로에 관한 것으로, 특히 온도 계측장치나 온도제어가 필요한 전기오븐 같은 조리기구에서 온도를 감지하기 위한 온도검출회로에 관한 것이다.The present invention relates to a temperature detection circuit using an RTD temperature sensor, and more particularly, to a temperature detection circuit for sensing temperature in a cooking apparatus such as a temperature measuring device or an electric oven requiring temperature control.
일반적으로, 전기 오븐등은 오븐 캐비티의 온도가 수백도이상인 온도를 감지하고 조절해야 하므로, 흔히 온도 센서용으로 사용되는 실리콘 더어미스터로는 전기 오븐 등에 사용할 수 없으며 정밀온도 계측이나 고온용으로 사용되는 백금촉매 센서인 RTD온도센서를 사용해야 한다. 그러기 위해서는 아날로그 신호를 디지탈 신호로 변환하고, 마이크로컴퓨터를 이용하여 변환된 신호를 처리하여 그 신호를 외주장치에 전달하여야만이 온도 조절이 가능하게 된다.In general, electric ovens need to sense and adjust the temperature of the oven cavity to be hundreds of degrees or more. Therefore, the silicon thermistor, which is often used for temperature sensors, cannot be used for electric ovens, and is used for precision temperature measurement or high temperature. The RTD temperature sensor, a platinum catalyst sensor, should be used. To do this, temperature can be controlled only by converting an analog signal into a digital signal, processing the converted signal using a microcomputer, and transmitting the signal to an external device.
종래의 마이크로컴퓨터를 이용한 온도검출회로는 제1도에 도시한 바와같이, 1칩 마이크로컴퓨터(One Chip Microcomputer)의 출력포드(D1~Dn)에 각각 버퍼입력단이 연결되고, 그 출력단에는 저항값이 2R인 저항을 직렬로 각각 연결해서 이 포트중 최상위 포트(MSB)의 부분을 비교기의 반전단(-)에 Vref로 연결하고, 각 출력포트에 연결된 저항(2R)사이에 R의 저항값의 저항을 연결하고, 최하위 포트(LSB)와 접지사에는 2R의 저항값을 갖는 저항으로 연결된다.In the conventional temperature detection circuit using a microcomputer, as shown in FIG. 1, a buffer input terminal is respectively connected to the output pods D 1 to Dn of a one chip microcomputer, and a resistance value is output to the output terminal. Connect the 2R resistors in series and connect the uppermost part of this port (MSB) to the inverting terminal (-) of the comparator with Vref, and between the resistors (2R) connected to each output port, The resistor is connected, and the lowest port (LSB) and the ground yarn are connected with a resistor having a resistance value of 2R.
또, 센서저항(RS)의 일단은 전원부에 연결되고 다른단은 고정저항(r1)을 직렬로 연결하고 센서저항(RS)와 고정저항(r1)사이에 병려로 고정저항(r2)을 연결하고, 저항(r2)의 타단은 접지시킨다. 또한, 저항(r1)의 타단은 비교기의 비반전단(+)에 Vin전압으로 인가되고, 비교기의 출력단(Vout)은 마이크로컴퓨터의 입력단(A)포트에 연결된다In addition, one end of the sensor resistance (RS) is connected to the power source and the other end is fixed resistor (r 1) of connected in series and fixed to byeongryeo between sensor resistance (RS) and a fixed resistance (r 1) the resistance (r 2) And connect the other end of resistor (r 2 ) to ground. In addition, the other end of the resistor r 1 is applied as the Vin voltage to the non-inverting terminal (+) of the comparator, and the output terminal Vout of the comparator is the input terminal A of the microcomputer. Is connected to the port
이상과 같이 구성된 제1도는 다음과 같이 동작한다.1 configured as described above operates as follows.
비교기의 입력 전압은 Vin과 Vref로 구분되고 Vin과 Vref를 비교하여 Vin이 크면 출력(Vout)은 “하이(H)”가 되고, Vref가 크면 출력 (Vout)은 “로우(L)”가 되어 마이크로 컴퓨터에 전달된다. 온도 분해능과 관계있는 출력포트의 수(n)는 고정도의 온도 검지를 위해서는 큰 정수값이 되고, 저정도의 온도검지를 위해서는 작은 정수값이 된다.The input voltage of the comparator is divided into Vin and Vref. When Vin and Vref are compared, if Vin is large, the output (Vout) becomes “high”. If Vref is large, the output (Vout) becomes “low”. Is delivered to the microcomputer. The number n of output ports related to the temperature resolution becomes a large integer value for high accuracy temperature detection and a small integer value for low temperature detection.
여기서,로 계산할 수 있으며, Dn,D1의 값은 마이크로컴퓨터에 출력하는 “하이” 또는 “로우” 신호에 의한 “1” 또는 “0”의 값에 해당된다.의 값이 되어, Vin〉Vref이면 Vout는 “하이”가 되고, Vin〈Vref이면 “로우”가 되어 마이크로컴퓨터에 전달된다. 마이크로컴퓨터는 “하이”일 때, 출력포트(D1~Dn)의 디지탈 값을 일거 온도로 환산하게 되는 것이다.here, The value of Dn, D 1 corresponds to the value of "1" or "0" by the "high" or "low" signal output to the microcomputer. If Vin> Vref, then Vout is “high”; if Vin <Vref, it is “low” and is passed to the microcomputer. When the microcomputer is "high", the digital value of the output ports D 1 to Dn is converted into a single temperature.
이와같이, 종래에는 온도 분해능을 좋게 하기 위해서는 출력프토(D1~Dn)의 n의 값이 커져야 되었으며, n의 값이 증가하면 증가하는 만큼 다른 기능에 대한 마이크로컴퓨터의 출력포트의 수가 감소되므로 제어기능에 많은 제약을 받게되고 오븐의 캐비티 등과 같은 곳의 온도를 측정하는 경우, 온도 센서회로를 구성하는데 복잡한 회로를 보강해야만 한다. 또 종류가 다른 온도센서를 포함하는 경우에는 아날로그 멀티플렉서와 같은 부품의 증가를 요구하게 된다.As such, in the related art, in order to improve the temperature resolution, the value of n of the output protons (D 1 to Dn) has to be increased. As the value of n increases, the number of output ports of the microcomputer for other functions decreases as the value of n increases. In the case of being subjected to a lot of constraints and measuring temperature in a place such as a cavity of an oven, a complicated circuit must be reinforced to construct a temperature sensor circuit. In addition, the inclusion of different types of temperature sensors will require an increase in components such as analog multiplexers.
본 고안은 고기능화된 전기 오븐등에서, 조리방식, 예약 및 디스플레이 등의 다양한 종류의 기능을 실시하기 위해 I/O포트가 많은 CPU를 제공하고, 특히 RTD온도 센서의 전류의 제한성을 고려한 구성을 채용한 것이다. 따라서 본 고안은 특수기능이 없는 일반 I/O포트로 구성된 CPU에 전달하기 위해서 필요했던 복잡한 아날로그-디지탈 변환기 까지 내장한 고기능화된 1칩 마이크로 컴퓨터(CPU)을 이용하여 간단한 회로를 구성하고, RTD온도센서의 선형성을 충분히 이용하고, RTD온도센서의 전류제한성을 극복하여 전체 시스템의 신뢰성을 향상시키고 고기능화를 이룰수 있는 온도검출회로를 제공한다.The present invention provides a CPU with a large number of I / O ports to perform various kinds of functions such as cooking method, reservation, and display in a highly functional electric oven, and in particular, adopting a configuration considering the current limitation of the RTD temperature sensor. will be. Therefore, the present invention consists of a simple circuit using a highly functional 1-chip microcomputer (CPU) that incorporates the complex analog-to-digital converter needed to deliver to a CPU composed of general I / O ports without special functions. By utilizing the linearity of the sensor fully and overcoming the current limitation of the RTD temperature sensor, it provides a temperature detection circuit that can improve the reliability of the whole system and achieve high functionality.
상기의 목적을 달성하기 위한 본 고안의 구성을 제2도 및 제3도를 참고하여 상세히 설명한다.The configuration of the present invention for achieving the above object will be described in detail with reference to FIGS. 2 and 3.
본 고안은 제2도에 나타낸 바와같이 조리기인 전기오븐의 제어를 예로하여 구성하였다. 여기서, CPU(1)는 아날로그-디지탈 변환기를 포함하고 있고, 전원 공급부(2)는 DC생성부, 리세트부, 하드웨어 INT용 펄스 발생부를 포함한다. 키이 입력부(3)는 각종 기능 선택키이와 옵션(option)용 딥 스위치(Dip Switch)를 포함하고 LED로 표시되도록 구성된다. 디스플레이부(5)는 온도설정치 및 현재치 MWO의 전원 출력을 표시하고, 현재시간, 예약시간, 조리시간, MWO조리시간 등을 표시한다. 스위치 제어부(6)는 릴레이 구동과 스위치 릴레이로 구성되어 있다. 센서입력부(4)는 2종류의 4개의 센서로 회로를 구성한다. 상기 기능부들은 중앙의 1칩 마이크로컴퓨터와 입출력 관계를 유지하도록 연결된다.The present invention is configured by taking the control of the electric oven as a cooker as shown in FIG. Here, the CPU 1 includes an analog-to-digital converter, and the power supply unit 2 includes a DC generator, reset unit, and hardware INT pulse generator. The key input unit 3 includes various function selection keys and an option dip switch, and is configured to be displayed by LEDs. The display unit 5 displays the temperature set value and the power output of the present value MWO, and displays the current time, reservation time, cooking time, MWO cooking time, and the like. The switch control section 6 is composed of a relay drive and a switch relay. The sensor input unit 4 constitutes a circuit with four types of two sensors. The functional units are connected to maintain an input / output relationship with a central one-chip microcomputer.
센서입력부(4)의 구성을 제3도에 의하여 설명한다.The configuration of the sensor input section 4 will be described with reference to FIG.
CPU(one chip Microcomputer) 전원 (Vcc)과 AD기준전압(Vref)은 전원 공급부의 출력 정전압(Vc)와 연결되고 접지(GND)는 Vss와 연결된다. RTD센서(RS1)는 오븐에서 고온의 캐비티 온도를 측정하기 위해 사용된 것이고, 전원전압(Vc)과 접지(GND)사이에 저항(R1)과 저항(R2)를 직렬로 연결하고, 저항(R1,R2)사이에 저항(R3)을 연결한다. 저항(R3)의 한단은 비교기(OP1)의 비반전단자(+)에 연결하며 비교기(OP1)의 반전단(-)은 비교기(OP1)의 출력단에 접속시킨다.The CPU (one chip microcomputer) power supply (Vcc) and the AD reference voltage (Vref) are connected to the output constant voltage (Vc) of the power supply and the ground (GND) is connected to Vss. RTD sensor (RS 1 ) is used to measure the high temperature cavity temperature in the oven, and connects the resistor (R 1 ) and resistor (R 2 ) in series between the power supply voltage (Vc) and ground (GND), Connect a resistor (R 3 ) between the resistors (R 1 , R 2 ). Resistance inverting terminal of the (R 3) one is connected to the non-inverting terminal (+) of the comparator (OP 1), and a comparator (OP 1) of the (-) is thus connected to the output of the comparator (OP 1).
저항(R4)은 비교기(OP1)의 출력단과 비교기(OP2)의 반전단(-)의 사이에 배치된다. 비교기(OP2)의 반전단(+)과 비교기(OP2)의 출력단 사이에 RTD 센서(RS1)을 연결하고 비교기(OP2)의 출력단은 저항(R5)과 연결되어 CPU의 아날로그 입력단(AD1)에 접속된다. 그리고, 전원(Vc)과 접지 사이에 저항(R6)과 저항(R7)을 직렬로 연결하고 그 기준전압(V④)에 비교기(OP2)의 비반전단자(+)을 연결한다. 또, 음식물의 내부온도 및 제어기의 온도, 외부 스위치 보드(릴레이 보드)의 온도를 측정하기 위해서는 저온용인 NTC실리콘 더어미스터를 이용한 센서(RS2~RS4)로 구성한다.이 세 개의 센서(RS2~RS4)는 동일한 구성을 가지며, 각기 값이 다른 저항(R5~R13)과 연결되어 있다.The resistor R 4 is disposed between the output terminal of the comparator OP 1 and the inverting terminal (−) of the comparator OP 2 . A comparator (OP 2) inverting stage (+) and a comparator (OP 2) connected to (RS 1) RTD sensor between the output terminal and the output terminal of the comparator (OP 2) is connected to the resistor (R 5) the analog input of the CPU of the It is connected to (AD 1 ). A resistor R 6 and a resistor R 7 are connected in series between the power supply Vc and the ground, and a non-inverting terminal (+) of the comparator OP2 is connected to the reference voltage V ④. In addition, in order to measure the internal temperature of the food, the temperature of the controller, and the temperature of the external switch board (relay board), it consists of sensors (RS 2 to RS 4 ) using NTC silicon thermistors for low temperature. 2 to RS 4 ) have the same configuration, and are connected to resistors R 5 to R 13 having different values.
전원(Vc)와 CPU의 아날로그 입력단 (AD2)사이에는 센서(RS2)와 저항(R9)이 직렬로 연결되고, 센서(RS2)와 저항(R9)의 기준전압(Va)과 접지 사이에는 저항(R8)을 배치한다. 동일한 구성으로 전원(Vc)과 접지 사이에 센서(RS3,RS4)와 저항(R10,R12)을 직렬로 연결하고 센서(RS3,RS4)와 저항(R10-,R12)의 접(Vb,Vc)과 CPU의 아날로그 입력단(AD3,AD4)과의 사이에는 저항(R11,R13)을 연결한다.The sensor RS 2 and the resistor R 9 are connected in series between the power supply Vc and the analog input terminal AD 2 of the CPU, and the reference voltage Va of the sensor RS 2 and the resistor R 9 and Place a resistor (R 8 ) between grounds. Sensor between the power source (Vc) and the ground in the same configuration (RS 3, RS 4) and a resistor (R 10, R 12) connected in series, and the sensor (RS 3, RS 4) and a resistor (R 10 -, R 12 ) Connect the resistors (R 11 , R 13 ) between the contacts (Vb, Vc) and the analog input terminals (AD 3 , AD 4 ) of the CPU.
다음에 상기와 같은 구성에 있어서의 동작에 대해 설명한다.Next, the operation in the above configuration will be described.
먼저, 제3도에서 RTD센서(RS1)를 이용하여 온도를 검출하는 동작은 다음과 같다(A부분). 비교기(OP1)의 출력은 비교기(OP1)전압 귀환의 동작에 의하여 1①=V②가 된다First, an operation of detecting a temperature using the RTD sensor RS 1 in FIG. 3 is as follows (part A). The output of the comparator (OP 1) is a 1① = V② by the operation of the comparator (OP 1) the feedback voltage
비교기(OP1)의 전압귀환은 센서(RS1)의 전류 제한성을 극복하도록 전압의 선형성을 이용하기 위해서이다.The voltage feedback of the comparator OP 1 is to take advantage of the linearity of the voltage to overcome the current limitation of the sensor RS 1 .
따라서,이고, R3는 비교기(OP1)의 입력저항이된다. 비교기(OP2)는 차동증폭기로 구성되고, 그 차동증폭기로 구성된 비교기(OP2)의 반전단과출력단 사이에 RTD센서를 연결하였기 때문에 반전단(-)의 입력저항과의 비로 차동증폭하여 온도를 측정하게 된다. 그에 의하여 비반전 입력단 전압(V④)은 반전입력단 전압(V③)과 같게된다.therefore, R 3 is the input resistance of the comparator OP 1 . Comparator (OP 2 ) consists of a differential amplifier, because the RTD sensor is connected between the inverting stage and the output stage of the comparator (OP 2 ) composed of the differential amplifier, the differential amplifier amplifies the temperature by the ratio of the input resistance of the inverting stage (-) Will be measured. As a result, the non-inverting input terminal voltage V④ becomes equal to the inverting input terminal voltage V③.
로 되고, 전압(V③)과 전압(V④)이 같게 되어서 전류(Is)는 저항(R4)를 거쳐 센서(RS1)에 흐르게 되고, 따라서, 다음의 등식이 성립된다.As is, be equal to the voltage (V③) and voltage (V④) Current (Is) is a flow sensor (RS 1) via a resistor (R 4), therefore, the following equation is established.
식(1)에서가 된다.In equation (1) Becomes
여기서, V②, V③, V④는 상수이고, Vs는 Rs에 대해 일정한 비례상슈를 갖게되고, 직선식이 된다. 또한, 저항(R4)은 센서(RS1)의 전류를 제한하기 위한 저항으로 Rs이 선형성을 유지시키고, RTD센서를 과전류로 부터 보호한다. 또 Vs는 아날로그 입력포트를 통하여 CPU에 입력되고, CPU내부의 아날로그-디지탈 변환기에 의해 디지탈 값으로 변환되고, 그 디지탈 값으로 온도를 검출하게 되는 것이다. 센살(RS2,RS3,RS4)는 NTC 실리콘 더어미스터로 저온의 온도 검출용으로 사용되어, 음식물의 내부 온도(100℃이하), 제어기온도, 릴레이 보드의 온도를 감지한다.Here, V2, V3, and V4 are constants, and Vs has a constant proportionality with respect to Rs, and becomes linear. In addition, the resistor R 4 is a resistor for limiting the current of the sensor RS 1 , and Rs maintains linearity and protects the RTD sensor from overcurrent. Vs is input to the CPU through the analog input port, converted into a digital value by the analog-to-digital converter inside the CPU, and the temperature is detected by the digital value. Sensals (RS 2 , RS 3 , RS 4 ) are NTC silicon thermistors used to detect low temperature temperatures, sensing the internal temperature of food (less than 100 ℃), controller temperature, and relay board temperature.
로 되고 Va는 입력포트저항(R9)를 통해 CPU의 아날로그 입력포트인 AD2포트에 입력되고, Vs측정과 같은 방법으로 온도를 검출한다. 그러나 센서(RS2~RS4)는 선형성이 없으므로 스위치로 보상해 주어야 한다.Va is input to AD 2 port, analog input port of CPU through input port resistance (R 9 ), and temperature is detected in the same way as Vs measurement. However, the sensors RS 2 to RS 4 are not linear and must be compensated with a switch.
이상에서 설명한 바와같이, 본 고안은 종래의 단점을 극복하여, 부품의 증가를 요하지 않으면서도 전제 시스템의 신뢰성을 향상시키는 RTD센서를 이용하여, 온도 계측장치나 온도 제어값이 큰 전기 오븐 등에 이용할 수 있는 온도 검출회로를 제공한다. 또한 온도 측정범위를 다양하게 가변하는 장치에도 적합한 온도 검출회로를 제공하게 된다.As described above, the present invention overcomes the drawbacks of the prior art and utilizes an RTD sensor that improves the reliability of the entire system without requiring an increase in parts, and thus can be used for a temperature measuring device or an electric oven having a large temperature control value. A temperature detection circuit is provided. In addition, the present invention provides a temperature detecting circuit suitable for a device having a variable temperature measuring range.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019900017983U KR930004428Y1 (en) | 1990-11-22 | 1990-11-22 | Temperature detection circuit using RTD sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019900017983U KR930004428Y1 (en) | 1990-11-22 | 1990-11-22 | Temperature detection circuit using RTD sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR920009909U KR920009909U (en) | 1992-06-17 |
| KR930004428Y1 true KR930004428Y1 (en) | 1993-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019900017983U Expired - Fee Related KR930004428Y1 (en) | 1990-11-22 | 1990-11-22 | Temperature detection circuit using RTD sensor |
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| Country | Link |
|---|---|
| KR (1) | KR930004428Y1 (en) |
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- 1990-11-22 KR KR2019900017983U patent/KR930004428Y1/en not_active Expired - Fee Related
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| KR920009909U (en) | 1992-06-17 |
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