CN107562088B - Temperature controller for resistance measurement and temperature control method - Google Patents
Temperature controller for resistance measurement and temperature control method Download PDFInfo
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- CN107562088B CN107562088B CN201710849218.8A CN201710849218A CN107562088B CN 107562088 B CN107562088 B CN 107562088B CN 201710849218 A CN201710849218 A CN 201710849218A CN 107562088 B CN107562088 B CN 107562088B
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Abstract
The invention discloses a temperature controller for resistance measurement and a temperature control method, comprising an alternating current power supply AC, a resistor E to be measured, a divider resistor R0, a first amplifier A1, a second amplifier A2, a brake IC, a pulse generator M and a triac TR; the resistor E to be tested is sequentially connected with the triac TR and the divider resistor R0 in series and is connected with the alternating current power supply AC in parallel to form a loop, voltage output generated by dividing is sequentially connected with the first amplifier A1 and the second amplifier A2, the output of the second amplifier A2 is connected with the brake IC, and the brake IC is also respectively connected with the pulse generator M and the triac TR. According to the invention, the thermocouple, the thermistor, the laser thermometer and the like are not required to be used for measuring the management target temperature, the change of the resistance in the circuit is monitored by utilizing the pulse time, and the measured resistance value change is calculated through the brake IC software to give out the comparison value of the temperature to be controlled, so that the rapid constant control temperature is achieved, and the operation is simple, economical and practical.
Description
Technical Field
The invention relates to the field of temperature control, in particular to a temperature controller for resistance measurement and a temperature control method.
Background
In China, industrialization driven by informatization is actively developing, and temperature is an important parameter in industrial object control, particularly in various industries such as metallurgy, chemical industry, machinery and the like, various heating furnaces, heat treatment furnaces, reaction furnaces and the like are widely used. Because of the different kinds and principles of the furnace, the heating methods and fuels used are also different, such as gas, natural gas, oil electricity, etc. The heating mode, the fuel and the control scheme are different for the temperature control under different production conditions and process requirements. Such as various heating furnaces, heat treatment furnaces, reaction furnaces and the like widely used in various industrial productions such as metallurgy, machinery, food, chemical industry and the like; the fuel comprises coal gas, natural gas, oil, electricity and the like; the Control scheme includes Direct Digital Control (DDC), inference Control, predictive Control, fuzzy Control (Fuzzy), expert Control (Expert Control), robust Control (robustcontrol), and inference Control.
The existing temperature control technology generally needs to collect the temperature of a target object in various ways and then control the temperature according to the comparison result with a set value. But the temperature collecting process is easy to generate errors, and has time delay and low temperature control and adjustment accuracy and timeliness. With the continuous development of industrial technology, the conventional control manner cannot meet the control requirements of high precision and high speed. For example, the contactor temperature control instrument has the main defects of large temperature fluctuation range, and the purpose of changing heating power is achieved mainly by controlling the on-off time proportion of the contactor, so that the on-off frequency is very low due to the error of the instrument and the service life limitation of the AC contactor.
1. Temperature hysteresis problem of controlled temperature field
In modern temperature control systems, the sensors used to control temperature are mostly thermocouples or thermal resistors mounted. This has the advantage that the anti-interference performance (such as corrosion resistance and vibration resistance) of the sensor can be improved, and the executive component can work stably without generating error response to interference. However, this will undoubtedly lead to a lag in temperature detection (i.e. the actual temperature field has reached the temperature set by the system, but since the sensor is not yet felt, the actuator continues to operate, causing the temperature field temperature to deviate more and more from the set point within the lag time. However, these are not recognizable to the skilled worker using the apparatus and often affect the quality of the work piece and are not controllable, especially in the absolute impermissibility of being relatively temperature sensitive
2. Problem of improper selection of temperature measurement points in temperature control system
The temperature control system is characterized in that a temperature control sensor is arranged at the corner of the temperature field, so that the temperature control system is convenient to install or use by a user. But the selection of the temperature measuring point must be considered in the following two cases from the process point of view.
3. Problem of ambient temperature variation in temperature control systems
A significant portion of the temperature control systems in use operate at higher ambient temperatures. This has a great influence on the accuracy of the temperature control of the system, in addition to the disadvantages of instruments and meters in the system. In particular systems using thermocouples as temperature sensors, this effect is greater and must be controlled to minimize the effect.
Ambient temperature compensation is the primary approach to solving this problem. Summarizing the temperature control systems contacted, the ambient temperature compensation is mostly accomplished by a temperature controller, not only of two types: one is manual compensation and the other is automatic compensation. The manual compensation is to set the ambient temperature through the panel, the temperature controller calculates the temperature field temperature signal actually sampled by the sensor and the ambient temperature signal set by the panel, and the temperature controller displays the actual temperature of the temperature field. The method for compensating the ambient temperature is often seen in temperature controllers produced in early stages, and is complicated to compensate, and compensation values are required to be changed along with the change of the ambient temperature. In contrast to this compensation method, the ambient temperature must be measured first when the system is in use. The automatic temperature compensation method is to measure the ambient temperature at any time by a thermistor in the temperature controller, and automatically calculate the value of the ambient temperature with a temperature field temperature signal sampled by a sensor to obtain the actual temperature value of the temperature field. The method is simple, and the influence of the change of the ambient temperature on the system is not needed to be considered when the system is used. However, in this method, there is a limit to the use of the ambient temperature (the cold end temperature of the thermocouple) to be considered. Because the thermistor in the temperature controller has a certain temperature sensing range, if the temperature of the detected temperature field increases (or decreases), the ambient temperature (the cold end temperature of the thermocouple) may exceed the temperature sensing range of the thermistor under the condition of poor heat insulation effect of the temperature field, and a great display error (10 CO error according to the test) is caused to the temperature control system. Therefore, users using the defective temperature control system need to keep the temperature controller away from the temperature field as far as possible or add cooling devices such as fans in the distribution control box. To ensure that the cold end temperature is within the ambient temperature range specified by the technical protocol. For such a system, the ambient temperature should be periodically monitored in real-time throughout the process to determine that it is within a prescribed range. The problematic systems are to be improved in time.
All temperature control modes in the current market need to measure temperature data of objects and spaces needing temperature management through mediums (thermocouples, thermistors, laser thermometers and the like), and then feed back the temperature data to a temperature control instrument for adjustment; when the environmental temperature difference changes abnormally, the prior art cannot meet the requirement of constant temperature, and besides large temperature management error, the cost is high. Moreover, some industries cannot install temperature measuring instruments (such as severe environments, motion and movement, etc.), and particularly in the case of constant temperature (temperature error within 0.1 ℃) temperature control, the prior art cannot achieve.
Disclosure of Invention
The invention aims at: the temperature controller and the temperature control method for measuring the resistance are provided, and the current and the resistance are obtained by utilizing pulse, so that the temperature is directly controlled, the constant temperature or the set temperature is reached, and the influence of the change of the ambient temperature is avoided.
The technical scheme of the invention is as follows:
the temperature controller for measuring the resistance comprises an alternating current power supply AC, a resistor E to be measured, a divider resistor R0, a first amplifier A1, a second amplifier A2, a brake IC, a pulse generator M and a triac TR; the resistor E to be tested is sequentially connected with the triac TR and the divider resistor R0 in series and is connected with the alternating current power supply AC in parallel to form a loop, voltage output generated by dividing is sequentially connected with the first amplifier A1 and the second amplifier A2, the output of the second amplifier A2 is connected with the brake IC, and the brake IC is also respectively connected with the pulse generator M and the triac TR.
Preferably, the ac power supply is further connected in parallel with two resistors R1 and R2 connected in series, and the voltage output generated by the voltage division and the voltage output at the connection point between the resistors R1 and R2 are respectively connected with the two-phase input ends of the first amplifier A1.
Preferably, the output end of the first amplifier A1 and one end of the alternating current power supply AC connected with the resistor to be tested E are respectively connected with two phase input ends of the second amplifier A2.
Preferably, the output end of the second amplifier A2 is connected to the brake IC through a diode D1.
Preferably, the brake IC is connected to the pulse generator M through a diode D2
Preferably, two ends of the resistor to be measured E are also connected to the resistor display N, respectively.
A temperature control method of a temperature controller for resistance measurement comprises the following steps:
1) Comparing the voltage division of resistors R1 and R2 and the voltage division of a resistor E which are connected in series in the circuit;
2) The pulse generator generates half-period alternating current pulses which are generated 6-8 times in 1 second;
3) A triac that conducts current to the half-cycle normally-open heater;
4) The first amplifier A1 compares the trimmed value with the resistance voltage on the heater side;
5) The second amplifier A1 compares the output of the first amplifier A1 with the alternating voltage;
6) The brake IC compares the detection data of the pulse generator, performs increment/decrement value input to the brake IC, performs comparison value of operation resistance change, and opens the triac;
7) The triac may be turned on during the entire braking cycle when the temperature reaches a certain temperature.
The invention has the advantages that:
the temperature controller for measuring the resistance provided by the invention does not need temperature acquisition in temperature control, namely does not need to use thermocouples, thermistors, laser thermometers and the like to measure the management target temperature, monitors the change of the resistance in a circuit by utilizing pulse time, and gives a comparison value of the temperature to be controlled by the measured resistance value through the operation of brake IC software, so that the temperature controller is fast and constant in temperature control, and is simple to operate, economical and practical.
Drawings
The invention is further described below with reference to the accompanying drawings and examples:
fig. 1 is a schematic circuit diagram of a temperature controller for measuring resistance according to the present invention.
Detailed Description
As shown in fig. 1, the temperature controller for measuring resistance disclosed by the invention comprises an alternating current power supply AC, a resistor to be measured E, a divider resistor R0, a first amplifier A1, a second amplifier A2, a brake IC, a pulse generator M, a resistor display N and a triac TR; the resistor E to be tested is sequentially connected with the triac TR and the divider resistor R0 in series and is connected with the alternating current power supply AC in parallel to form a loop, voltage output generated by dividing is sequentially connected with the first amplifier A1 and the second amplifier A2, the output of the second amplifier A2 is connected with the brake IC, and the brake IC is also respectively connected with the pulse generator M and the triac TR. The two ends of the resistor E to be measured are also respectively connected to a resistor display N.
The alternating current power supply is also connected with two resistors R1 and R2 in parallel, and the voltage output generated by the voltage division and the voltage at the connection point between the resistors R1 and R2 is respectively connected with the two-phase input end of the first amplifier A1. The output end of the first amplifier A1 and one end of the alternating current power supply AC connected with the resistor E to be tested are respectively connected with two-phase input ends of the second amplifier A2. The output end of the second amplifier A2 is connected with the brake IC through a diode D1. The brake IC is connected to the pulse generator M via a diode D2.
When the invention is embodied, the circuit schematic diagram is manufactured into the temperature control plate.
The invention utilizes the relation between the resistance and the power in the circuit; the resistance value in the loop is obtained by a voltage division mode and a pulse mode, the precision of resistance control is 0.01 ohm through a micro voltage comparator, a brake IC and a differential amplifier, and the required set power is obtained through resistance change. For example, the temperature needs 400+ -2 ℃, the corresponding temperature of the current unclear how much resistor is equal to 400 ℃, 100 ℃ is given first, the measured temperature is 200 ℃, the multiple relation of the temperature of the 200 ℃ corresponding to the temperature of 400 ℃ is known through the proportional relation, the resistance value of the needed+ -2 ℃ is obtained according to the operation mode, the ratio is recorded as the upper limit and the lower limit, and therefore the temperature can be kept within the needed specification.
The working process of the invention comprises the following steps:
1) Comparing the voltage division of resistors R1 and R2 and the voltage division of a resistor E which are connected in series in the circuit;
2) The pulse generator generates half-period alternating current pulses which are generated 6-8 times in 1 second;
3) A triac that conducts current to the half-cycle normally-open heater;
4) The first amplifier A1 compares the trimmed value with the resistance voltage on the heater side;
5) The second amplifier A1 compares the output of the first amplifier A1 with the alternating voltage;
6) The brake IC compares the detection data of the pulse generator, performs increment/decrement value input to the brake IC, performs comparison value of operation resistance change, and opens the triac;
7) In the whole braking period, when the triac is turned on, the temperature can be operated when the temperature reaches a certain temperature;
8) On the basis of the above, the temperature control board circuit is formed, and a special temperature measuring instrument is not needed.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same according to the content of the present invention, and are not intended to limit the scope of the present invention. All modifications made according to the spirit of the main technical proposal of the invention should be covered in the protection scope of the invention.
Claims (2)
1. A temperature controller for resistance measurement, characterized in that: the device comprises an alternating current power supply AC, a resistor E to be tested, a divider resistor R0, a first amplifier A1, a second amplifier A2, a brake IC, a pulse generator M and a triac TR; the resistor E to be tested is sequentially connected with the triac TR and the divider resistor R0 in series and is connected with the alternating current power supply AC in parallel to form a loop, voltage output generated by dividing is sequentially connected with the first amplifier A1 and the second amplifier A2, the output of the second amplifier A2 is connected with a brake IC, and the brake IC is also respectively connected with the pulse generator M and the triac TR;
the alternating current power supply is also connected with two resistors R1 and R2 in parallel, and the voltage output generated by the voltage division and the voltage at the connection point between the resistors R1 and R2 is respectively connected with the two-phase input end of the first amplifier A1;
the output end of the first amplifier A1 and one end of the alternating current power supply AC connected with the resistor E to be tested are respectively connected with two-phase input ends of the second amplifier A2;
the output end of the second amplifier A2 is connected with a brake IC through a diode D1;
the brake IC is connected with the pulse generator M through a diode D2;
the two ends of the resistor E to be measured are also respectively connected to a resistor display N.
2. A temperature control method of a resistance-measuring temperature controller according to claim 1, comprising the steps of:
1) Comparing the voltage division of resistors R1 and R2 connected in series in the circuit with the voltage division of a resistor E to be tested;
2) The pulse generator generates half-period alternating current pulses which are generated 6-8 times in 1 second;
3) A triac that conducts current to the half-cycle normally-open heater;
4) The first amplifier A1 compares the voltage of the connection point between the resistors R1 and R2 with the voltage output generated by the voltage division of the triac TR and the voltage dividing resistor R0;
5) The second amplifier A2 compares the output of the first amplifier A1 with the alternating voltage;
6) The brake IC compares the detection data of the pulse generator, performs increment/decrement value input to the brake IC, performs comparison value of operation resistance change, and opens the triac;
7) The triac may be turned on during the entire braking cycle when the temperature reaches a certain temperature.
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| CN108966371A (en) * | 2018-06-29 | 2018-12-07 | 深圳和而泰小家电智能科技有限公司 | A kind of heating device and its method for heating and controlling |
| CN109375291B (en) * | 2018-10-09 | 2019-12-27 | 成都信息工程大学 | Temperature, air pressure and humidity measuring device and method suitable for sonde |
| CN115192174B (en) * | 2021-06-30 | 2023-04-07 | 海杰亚（北京）医疗器械有限公司 | Method and device for adjusting pressure in working medium storage tank |
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