WO2010054592A1 - Circuit de commande pour sonde de température électronique - Google Patents

Circuit de commande pour sonde de température électronique Download PDF

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Publication number
WO2010054592A1
WO2010054592A1 PCT/CN2009/074913 CN2009074913W WO2010054592A1 WO 2010054592 A1 WO2010054592 A1 WO 2010054592A1 CN 2009074913 W CN2009074913 W CN 2009074913W WO 2010054592 A1 WO2010054592 A1 WO 2010054592A1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit
temperature
resistor
triangular wave
electrically connected
Prior art date
Application number
PCT/CN2009/074913
Other languages
English (en)
Chinese (zh)
Inventor
郑荣兴
Original Assignee
漳州灿坤实业有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 漳州灿坤实业有限公司 filed Critical 漳州灿坤实业有限公司
Publication of WO2010054592A1 publication Critical patent/WO2010054592A1/fr

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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
    • G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
    • G05D23/2401—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor using a heating element as a sensing element

Definitions

  • the present invention relates to an electronic temperature sensing rod control circuit, and more particularly to an electronic temperature sensing rod control circuit for a household appliance.
  • the temperature sensing bars that are seen on the market are divided into two categories, one is a mechanical temperature sensing rod, and the other is an electronic temperature sensing rod.
  • the present invention provides an electronic temperature sensing rod control circuit that overcomes the shortcomings of the background temperature sensing rods having low control precision, excessive temperature overshoot, and excessive fluctuation.
  • An electronic temperature sensing rod control circuit comprising a triangular wave generating circuit, a temperature signal processing circuit, a control signal output circuit and an electric combustion tube driving circuit.
  • the triangular wave generating circuit is for generating a triangular wave.
  • the temperature signal processing circuit includes a temperature adjustment circuit for adjusting the temperature of the temperature sensing rod, a temperature detection circuit for detecting the temperature, and a connection temperature adjustment circuit and the temperature detection circuit and comparing to generate a temperature signal level Op amp.
  • the control signal output circuit is connected to the triangular wave generating circuit and the op amp of the temperature signal processing circuit for comparing the triangular wave level and the temperature signal level to generate a control signal level.
  • the electric combustion tube driving circuit is connected to the control signal output circuit for controlling whether the heating and the heating time are controlled by the control signal level.
  • the triangular wave generating circuit includes an op amp, resistors R1, R2, R3, R4 and a capacitor C1, and the resistors R1, R2 and R3 cooperate to form an amplitude adjusting circuit for adjusting the amplitude of the upper and lower limits of the triangular wave.
  • the resistor R4 and the capacitor C1 cooperate to form a period adjusting circuit for adjusting the period of the triangular wave.
  • the temperature signal processing circuit includes an op amp, resistors R7, R8, VR, NTC, and a diode.
  • the temperature regulating circuit includes resistors R7, R8 and VR, and the temperature detecting circuit comprises NTC and diode D2
  • the control signal output circuit comprises an op amp, resistors R5, R9, and the two input terminals of the op amp are connected to the op amp of the triangular wave generating circuit and the temperature signal processing circuit through resistors R5 and R9, respectively.
  • the electric heating tube driving circuit includes R6, R13, triode Ql, Q2, relay Kl, diode D3
  • the drain of the transistor Q1 is electrically connected to the control signal output circuit through a resistor R6.
  • the C pole of the Q1 is electrically connected to the relay K1, the drain of the Q1 is electrically connected to the C pole of the Q2, and the B pole of the Q2 is electrically connected.
  • One end of the resistor R13, the E pole of the Q2 is grounded, wherein when the R6 and R13 are at a high level, the transistors Q1 and Q2 are turned on, the relay K1 is attracted, and the electric heating tube starts heating.
  • the present invention further includes: a power supply circuit for supplying a power supply Vcc of the operational amplifier and an operating power supply of the electric heating tube driving circuit, which is electrically connected to the triangular wave generating circuit, the temperature signal processing circuit, the control signal output circuit, and the electric combustion tube Drive circuit.
  • the present invention further includes: a protection circuit for preventing the temperature sensing rod from being properly temperature controlled by the NTC open circuit, which is connected to the temperature signal processing circuit and the electric combustion tube driving circuit.
  • the protection circuit includes resistors R10, Rl l, R12 and an op amp, an input end of the op amp is electrically connected to the temperature signal processing circuit through a resistor R10, and the other input terminal is electrically connected One end of the resistor R12 and the end of the resistor R11, the other end of the resistor R12 is grounded, and the other end of the resistor R11 is connected to the power supply circuit; the output end of the op amp is electrically connected to the B pole of the electric heating tube driving circuit transistor Q2, wherein After the NTC is open, the output of the op amp outputs a low level, which causes Q2 to be turned off.
  • FIG. 1 is a circuit diagram of an electronic temperature sensing rod control circuit of a preferred embodiment.
  • an electronic temperature sensing rod control circuit which includes a power supply circuit 10, a triangular wave generating circuit 20, a temperature signal processing circuit 30, a control signal output circuit 40, an electric heating tube driving circuit 50, and a protection circuit. 60.
  • the power supply circuit 10 is mainly used to supply the power supply Vcc of the operational amplifier and the operating power of the relay of the electric heating tube driving circuit 50.
  • the power circuit 10 has a xenon lamp POWER11 and a xenon lamp Heaterl2, and the xenon lamp POW ER11 and the xenon lamp HeaterU are used to indicate the working state of the electronic temperature sensing bar.
  • the neon light PO WER11 is always bright, the power is off, the neon light POWER11 is off; the electric heating tube is heated, the xenon lamp Heaterl2 is on, the electric heating tube stops heating, the xenon lamp HeaterU is off.
  • the triangular wave generating circuit 20 is for generating a triangular wave, which includes an op amp U1D and peripheral element resistors R1, R2, R3, R4 and a capacitor Cl.
  • the U1D is available in U1 324 with a positive input, a negative input and an output.
  • the positive input terminal is electrically connected to the resistor R1 - terminal and the resistor R 2 - terminal, and the negative input terminal is electrically connected to one end of the capacitor C1.
  • the other end of the resistor R1 is electrically connected to the power supply circuit 10 to obtain a voltage Vcc; the other end of the resistor R2 is electrically connected to the other end of the resistor C1 and grounded; the resistor R3 is connected in series between the positive input terminal and the output terminal; the resistor R4 is connected in series at the negative input terminal and the output terminal. between.
  • Resistor R1 is set to 100K
  • resistor R2 is set to 100K
  • resistor R3 is set to 100K
  • resistor R4 is set to 220K
  • capacitor C1 is set to 100U and 25V.
  • the resistors R1, R2 and R3 cooperate to form an amplitude adjusting circuit for adjusting the amplitude of the upper and lower limits of the triangular wave, and the resistor R4 and the capacitor C1 cooperate to form a period adjusting circuit for adjusting the period of the triangular wave.
  • the temperature signal processing circuit 30 includes an op amp U1A and peripheral component resistors R7, R8, R14, VR, NTC and a diode D2.
  • the U1A is available in UTC324 with a positive input, a negative input and an output.
  • the resistors R7, VR, and R8 are sequentially connected in series, and the other end of the resistor R7 is electrically connected to the power circuit 10 to obtain a voltage Vcc; the NTC terminal is electrically connected to the outer end of the R7, and the other end of the NTC is electrically connected to the positive terminal of the diode D2.
  • the negative terminal of the diode D2 is electrically connected to the positive input terminal of the op amp U1A and the VR, and the external terminal connected to the VR can adjust the VR; the negative input terminal of the op amp U1A is electrically connected to the output terminal; the R14-end Grounded, the other end is electrically connected to the negative terminal of diode D2.
  • the resistor R7 is 10K
  • the electric Resistor R8 is set to 2K
  • the resistor R14 is set to 1 ⁇
  • the MAX of the resistor VR is set to 20 ⁇
  • the resistor NTC is set to 200′4Ko.
  • the resistors R7, R8 and VR form a thermostat circuit, and the R8 can adjust the electrons.
  • the temperature sensor has the highest control temperature position.
  • the R7 can reduce the ON angle of the VR and make the VR temperature adjustment angle larger.
  • the VR is adjusted to the uppermost level, its signal level is higher than the highest level of the triangle wave.
  • the NTC and the diode D 2 constitute a temperature detecting circuit for detecting the temperature.
  • Control signal output circuit 40 including op amp U1C and peripheral components, the U1C product model UTC324 has a positive input, a negative input and an output.
  • the positive input terminal is electrically connected to one end of the resistor R5, and the other end of the R5 is connected to the other end of the R4 of the triangular wave generating circuit 20;
  • the negative input terminal is electrically connected to one end of the resistor R9, and the other end of the R9 is connected to the temperature signal processing circuit 30.
  • the R5 is set to 10K and the R9 is set to 10 ⁇ .
  • the amplifier U1C compares the triangular wave level signal generated by the amplifier U1D of the triangular wave generating circuit 20, and the temperature signal level generated by the amplifier U1A of the temperature signal processing circuit 30; the output level of the U1C output terminal
  • the level is a control signal level, and the level is a determining condition for heating or not the electric heating tube of the electric heating tube drive circuit 50.
  • the U1C When the triangular wave level is higher than the temperature signal level, the U1C outputs a high level; when the triangular wave level is lower than the temperature signal level, the U1C outputs a low level.
  • the temperature signal level is less than 1/3VCC ⁇ , the U1C outputs a high level, so that the electric heating tube starts to heat; when the temperature signal is greater than 2/3VCC ⁇ , the U1C outputs a low level, so that the electric heating tube stops heating;
  • the ratio of the working temperature between the electric heating tube and the non-working time decreases as the temperature signal level increases, and increases as the temperature signal level decreases.
  • the electric heating tube works less; when the temperature is lower than the set position, the electric heating tube works longer. In this way, the temperature can be gradually approached to the set gear position, and the overshoot can be avoided, so that the temperature control of the product is stable and the fluctuation is small.
  • the electric heating tube driving circuit 50 includes resistors R6, R13, transistors Ql, Q2, relay Kl, and diode D3.
  • the R6 is 10K
  • the drain of the Q1 is electrically connected to the output of the U1C through the resistor R6.
  • the C pole of the Q1 is electrically connected to the relay K1, and the drain of the Q1 is electrically connected to the C pole of the Q2.
  • the gate of the Q2 is electrically connected to one end of the resistor R13, and the drain of the Q2 is grounded.
  • Protection circuit 60 including resistors R10, Rl l, R12, R13, op amp U1B, R10, Rl l, Rl 2, R13, U1B constitute NTC open circuit protection circuit, to avoid electronic temperature sensing rod due to NTC open circuit Not working properly Temperature control.
  • the product model U1B is UTC324, which has a positive input, a negative input and an output.
  • the resistor R10 is 10K
  • the resistor R11 is 240K
  • the resistor R12 is 10K
  • the resistor R13 is 10K.
  • the output end of the amplifier U1B is electrically connected to the other end of the resistor R13.
  • the positive input terminal is electrically connected to the other end of the R14 through a resistor R10.
  • the negative input terminal is electrically connected to the resistor R12-terminal and the resistor R11. One end, the other end of the resistor R12 is grounded, the other end of the resistor R11 is connected to the power supply circuit 10 to obtain the voltage VCCo.
  • the control circuit itself can control the electric heating tube to not heat; when the NTC works normally, the diode D2 is turned on.
  • the normal voltage drop, D2 positive will have a voltage greater than 0.7ZU;
  • the resistor R14 pulls down ⁇ D2 to get the positive voltage close to zero, R14 chooses a larger value, does not affect the normal temperature signal level , R11 and R12 resistor divider is about 0.5V;
  • NTC is open, U1B outputs low level, so that Q2 is cut off, the electric heating tube can not be heated normally.
  • An electronic temperature sensing rod control circuit of the present invention wherein a control signal level generated by the control signal output circuit is obtained after comparing a triangular wave level and a temperature signal level, the control signal level controlling the electric combustion tube heating,
  • the ratio of the working and non-working time of the electric heating tube decreases as the temperature signal level increases, and increases as the temperature signal level decreases.
  • the temperature control method is asymptotic, avoiding overshoot, making the temperature stable more quickly, and the temperature control is more accurate and stable.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Temperature (AREA)

Abstract

L’invention concerne un circuit de commande pour une sonde de température électronique, qui comprend un circuit de génération d’onde triangulaire (20), un circuit de traitement de signal de température (30), un circuit de sortie de signal de commande (40), et un circuit d’actionnement pour un tube de chauffage électrique (50). Le circuit de génération d’onde triangulaire (20) est utilisé pour générer une onde triangulaire. Le circuit de traitement de signal de température (30) comprend un circuit de régulation de température afin de réguler la température de commande de la sonde de température, un circuit de détection de température afin de détecter la température et un amplificateur fonctionnel (U1A) qui est connecté au circuit de régulation de température et au circuit de détection de température, et effectue une comparaison afin de générer un niveau de signal de température. Le circuit de sortie de signal de commande (40) est connecté aux amplificateurs fonctionnels (U1D,U1A) du circuit de génération d’onde triangulaire (20) et du circuit de traitement de signal de température (30), et est utilisé afin de comparer le niveau d’onde triangulaire avec le niveau de signal de température afin de générer un niveau de signal de commande. Le circuit d’actionnement pour tube de chauffage électrique (50) est connecté au circuit de sortie de signal de commande (40) et est utilisé afin de définir une opération de chauffage et un temps de chauffage.
PCT/CN2009/074913 2008-11-15 2009-11-12 Circuit de commande pour sonde de température électronique WO2010054592A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200820229106.9 2008-11-15
CNU2008202291069U CN201319149Y (zh) 2008-11-15 2008-11-15 一种电子感温棒控制电路

Publications (1)

Publication Number Publication Date
WO2010054592A1 true WO2010054592A1 (fr) 2010-05-20

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CN (1) CN201319149Y (fr)
WO (1) WO2010054592A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201319149Y (zh) * 2008-11-15 2009-09-30 厦门灿坤实业股份有限公司 一种电子感温棒控制电路
CN102411382B (zh) * 2011-09-30 2014-01-08 中国兵器工业集团第二一四研究所苏州研发中心 防温度过冲的温控电路
CN106970665A (zh) * 2017-06-01 2017-07-21 中山市勤峰电器有限公司秋浦分公司 一种电子式数显式调温棒
CN107024945A (zh) * 2017-06-01 2017-08-08 中山市勤峰电器有限公司秋浦分公司 一种电子式调温棒

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4007425A (en) * 1976-01-12 1977-02-08 The United States Of America As Represented By The Secretary Of The Army Temperature sensor using pulse width modulator for duty cycle control
JPS60146308A (ja) * 1984-01-11 1985-08-02 Hitachi Ltd クロマトグラフ
JPS61134817A (ja) * 1984-12-05 1986-06-21 Stanley Electric Co Ltd 温度制御装置
JPS62156708A (ja) * 1985-12-27 1987-07-11 Tokyo Juki Ind Co Ltd 温度制御装置
JPH07230324A (ja) * 1994-02-16 1995-08-29 Taiyo Denki Sangyo Kk 温度制御装置
US5519190A (en) * 1992-03-16 1996-05-21 Minolta Camera Kabushiki Kaisha Heater driving device for supplying AC power to a heater
CN2318661Y (zh) * 1996-08-26 1999-05-12 温州市电子技术研究所 一种电子式温度控制仪
CN2609028Y (zh) * 2003-03-12 2004-03-31 深圳市和而泰电子科技有限公司 高精度温度控制器
CN2909762Y (zh) * 2006-03-22 2007-06-06 李和发 恒温电热控制电路
CN101098571A (zh) * 2006-06-28 2008-01-02 尹正洙 电热地毯的温控器
CN201319149Y (zh) * 2008-11-15 2009-09-30 厦门灿坤实业股份有限公司 一种电子感温棒控制电路

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4007425A (en) * 1976-01-12 1977-02-08 The United States Of America As Represented By The Secretary Of The Army Temperature sensor using pulse width modulator for duty cycle control
JPS60146308A (ja) * 1984-01-11 1985-08-02 Hitachi Ltd クロマトグラフ
JPS61134817A (ja) * 1984-12-05 1986-06-21 Stanley Electric Co Ltd 温度制御装置
JPS62156708A (ja) * 1985-12-27 1987-07-11 Tokyo Juki Ind Co Ltd 温度制御装置
US5519190A (en) * 1992-03-16 1996-05-21 Minolta Camera Kabushiki Kaisha Heater driving device for supplying AC power to a heater
JPH07230324A (ja) * 1994-02-16 1995-08-29 Taiyo Denki Sangyo Kk 温度制御装置
CN2318661Y (zh) * 1996-08-26 1999-05-12 温州市电子技术研究所 一种电子式温度控制仪
CN2609028Y (zh) * 2003-03-12 2004-03-31 深圳市和而泰电子科技有限公司 高精度温度控制器
CN2909762Y (zh) * 2006-03-22 2007-06-06 李和发 恒温电热控制电路
CN101098571A (zh) * 2006-06-28 2008-01-02 尹正洙 电热地毯的温控器
CN201319149Y (zh) * 2008-11-15 2009-09-30 厦门灿坤实业股份有限公司 一种电子感温棒控制电路

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