阅读说明：本技术 温度检测电路板、电子设备、温度控制系统及电器设备 (Temperature detection circuit board, electronic equipment, temperature control system and electrical equipment ) 是由 石亚晨 于 2019-10-08 设计创作，主要内容包括：本发明公开了一种温度控制电路板,用传热片来实现温度传感器的测量,加热时,只需将加热源放至传热片上,传热片背面的热电阻即可均匀受热,从而实现温度的上升,可以通过传感器输出电压的变化来测量其电路特性。对于老师来说,可以课堂上给学生演示温度变化时传感器的特性变化,方便快捷。对于学生来说,可以快速看到温度变化对输出信号的影响,如果遇到电路故障,也能通过传热片改变热电阻阻值进而改变输入信号,进行快速判断。(The invention discloses a temperature control circuit board, which realizes the measurement of a temperature sensor by using a heat transfer sheet, wherein when heating is carried out, a heating source is only needed to be put on the heat transfer sheet, and a thermal resistor on the back of the heat transfer sheet can be uniformly heated, thereby realizing the temperature rise, and the circuit characteristic can be measured by the change of the output voltage of the sensor. For teachers, the characteristic change of the sensor can be demonstrated for students in a classroom when the temperature changes, and the teaching desk is convenient and quick. For students, the influence of temperature change on output signals can be quickly seen, and if circuit faults occur, the resistance value of the thermal resistor can be changed through the heat transfer sheet so as to change input signals, and quick judgment can be carried out.)

1. A temperature detection circuit board is characterized in that: one side of the circuit board is painted with the temperature detection circuit, and the other side of the circuit board is provided with a heat transfer sheet, the temperature detection circuit comprises a temperature sensor circuit, and the heat transfer sheet corresponds to the position of a thermal resistor in the temperature sensor circuit;

the heat transfer sheet is used for contacting a heating source, absorbing heat and transferring the heat to the thermal resistor through the circuit board;

and the temperature sensor circuit is used for detecting the temperature of the heating source through the thermal resistor.

2. The circuit board of claim 1, wherein: the temperature detection circuit comprises at least one dial switch, the dial switch is connected with components of the temperature detection circuit, and the dial switch is used for selecting the working state of the components in the temperature detection circuit.

3. The circuit board of claim 2, wherein: the dial switch comprises a two-bit dial switch, the two-bit dial switch is connected with a resistor with a fixed resistance value and/or a capacitor with a fixed capacitance value, the first bit controls whether the connected resistor and/or capacitor is short-circuited, and the second bit controls whether the connected resistor and/or capacitor is connected into a circuit.

4. The circuit board of claim 2, wherein: the dial switch comprises a three-position dial switch, the three-position dial adjustable potentiometer is connected with the dial switch, the adjustable potentiometer comprises an adjustable resistor and a fixed resistor, the first position controls whether the connected adjustable resistor is short-circuited, the second position controls whether the connected adjustable resistor is connected into a circuit, and the third position controls whether the connected fixed resistor is short-circuited.

5. The circuit board of claim 1, wherein: the heat transfer sheet is a metal heat transfer sheet.

6. The circuit board of claim 5, wherein: the metal heat transfer sheet is welded on the circuit board.

7. An electronic device, characterized in that: comprising a circuit board according to any of claims 2-6.

8. A temperature control system, comprising:

a heater for changing a system temperature;

a temperature sensor for measuring a system temperature;

a heat transfer sheet for contacting the heater and absorbing heat and transferring the heat to the temperature sensor through the circuit board;

and the controller is used for controlling the working state of the heater according to the measurement data of the temperature sensor.

9. The temperature control system of claim 8, wherein: the heat radiating device also comprises a heat radiating fan, wherein the heat radiating fan is arranged at the heat transfer sheet, is connected with the controller and is used for radiating the heat transfer sheet under the control of the controller.

10. An electrical device, characterized by: comprising a temperature control system according to any of claims 8-9.

Technical Field

The present invention relates to the field of circuits, and in particular, to a temperature detection circuit board, an electronic device, a temperature control system, and an electrical device.

Background

In teaching practice, it is usually necessary to measure the temperature characteristic curve of a certain temperature sensor, i.e. the resistance value change at different temperatures, and if the characteristics of the thermal resistor are to be studied, it is necessary to simulate heating or cooling. The method usually adopted is a heating method by using an electric iron or a heat gun. However, this method has a drawback that the electric soldering iron heating method often damages the components, the contact time is short, the resistance change is not obvious, the components are easily heated after the contact time is long, and the measurement is not very easy. The hot air gun heating method is restricted by instruments, the welding table of the hot air gun is high in manufacturing cost, and the condition of uneven heating is easily caused by the fact that the hot air gun is heated by the technique and the patience is examined.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a temperature detection circuit board, electronic equipment, a temperature control system and electrical equipment which are uniformly heated and cannot scald components.

The technical scheme adopted by the invention for solving the technical problems is as follows:

on the one hand, the method comprises the following steps of,

a temperature detection circuit board is characterized in that one side of the circuit board is painted with a temperature detection circuit, the other side of the circuit board is provided with a heat transfer sheet, the temperature detection circuit comprises a temperature sensor circuit, and the heat transfer sheet corresponds to a thermal resistor in the temperature sensor circuit in position;

the heat transfer sheet is used for contacting a heating source, absorbing heat and transferring the heat to the thermal resistor through the circuit board;

and the temperature sensor circuit is used for detecting the temperature of the heating source through the thermal resistor.

Further, the temperature detection circuit comprises at least one dial switch, the dial switch is connected with a component of the temperature detection circuit, and the dial switch is used for selecting the working state of the component in the temperature detection circuit.

Furthermore, the dial switch comprises a two-bit dial switch, the two-bit dial switch is connected with a resistor with a fixed resistance value and/or a capacitor with a fixed capacitance value, the first bit controls whether the connected resistor and/or capacitor is short-circuited, and the second bit controls whether the connected resistor and/or capacitor is connected to the circuit.

Further, the dial switch comprises a three-position dial switch, the three-position dial adjustable potentiometer is connected, the adjustable potentiometer comprises an adjustable resistor and a fixed resistor, the first position controls whether the connected adjustable resistor is short-circuited, the second position controls whether the connected adjustable resistor is connected to the circuit, and the third position controls whether the connected fixed resistor is short-circuited.

Further, the heat transfer sheet is a metal heat transfer sheet.

Further, the metal heat transfer sheet is soldered on the circuit board.

On the other hand, in the case of a liquid,

an electronic device comprising the circuit board of any of the above aspects.

On the other hand, in the case of a liquid,

a temperature control system, comprising:

a heater for changing a system temperature;

a temperature sensor for measuring a system temperature;

a heat transfer sheet for contacting the heater and absorbing heat and transferring the heat to the temperature sensor through the circuit board;

and the controller is used for controlling the working state of the heater according to the measurement data of the temperature sensor.

Further, the heat dissipation device also comprises a heat dissipation fan, wherein the heat dissipation fan is arranged at the heat transfer sheet and connected with the controller and used for dissipating heat of the heat transfer sheet under the control of the controller.

On the other hand, in the case of a liquid,

an electrical device comprising a temperature control system according to any of the above aspects.

Has the advantages that:

according to the temperature control circuit board provided by the technical scheme, the heat transfer sheet is used for measuring the temperature sensor, when heating is carried out, only the heating source is placed on the heat transfer sheet, the thermal resistor on the back of the heat transfer sheet can be uniformly heated, so that the temperature rise is realized, and the circuit characteristics of the temperature control circuit board can be measured through the change of the output voltage of the sensor. For teachers, the characteristic change of the sensor can be demonstrated for students in a classroom when the temperature changes, and the teaching desk is convenient and quick. For students, the influence of temperature change on output signals can be quickly seen, and if circuit faults occur, the resistance value of the thermal resistor can be changed through the heat transfer sheet so as to change input signals, and quick judgment can be carried out.

Drawings

Fig. 1 is a schematic structural diagram of a temperature detection circuit board according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a circuit structure for mounting a dial switch according to an embodiment of the present invention;

FIG. 3 is a schematic circuit diagram of a two-bit toggle switch for connecting a capacitor according to an embodiment of the present invention;

FIG. 4 is a schematic circuit diagram of a three-position toggle actuator coupled to an adjustable potentiometer according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a temperature control system according to an embodiment of the present invention;

fig. 6 is a schematic circuit diagram of an operational hysteresis circuit according to an embodiment of the present invention;

fig. 7 is a schematic circuit diagram of a maximum comparison output circuit according to an embodiment of the present invention.

Detailed Description

The current temperature detection circuit usually adopts contact and non-contact sensors, and according to the working principle of the temperature sensor, the circuit can be divided into a digital type and a linear resistance type, the most common digital type is a sensor of the SHT10 series, and the most common linear resistance type sensor is PT100 and TMP 235. Linear resistive sensors typically vary in resistance with changes in temperature.

The thermal resistance in the temperature sensor is measured based on the thermal effect of the resistance, that is, the characteristic that the resistance value of the resistor changes with the change of temperature. Therefore, the temperature can be measured only by measuring the resistance change of the temperature sensing thermal resistor. At present, the metal thermal resistor and the semiconductor thermistor are mainly used.

The resistance and temperature of a metal thermal resistor can generally be expressed by the following approximate relationship, namely

Rt＝Rt0[1+α(t-t0)]

In the formula, Rt is the resistance value at the temperature t; rt0 is the resistance value at temperature t0 (usually t0 ═ 0 ℃); and alpha is a temperature coefficient.

The semiconductor thermistor has a resistance value and temperature relationship of

Rt＝AeB/t

Wherein Rt is the resistance at temperature t; A. b depends on the constants of the structure of the semiconductor material.

In comparison, the thermistor has a larger temperature coefficient, a higher resistance value at normal temperature (usually over thousands of ohms), but has poor interchangeability and serious nonlinearity, and the temperature measurement range is only about-50 to 300 ℃, so that the thermistor is widely used for detecting and controlling the temperature of household appliances and automobiles. The metal thermal resistor is generally suitable for temperature measurement within the range of-200 to 500 ℃, and has the characteristics of accurate measurement, good stability, reliable performance and extremely wide application in control.

TMP235 is also a temperature sensor whose output voltage is proportional to temperature and can be used by designers in a variety of analog temperature sensing applications. Flexible PMIC. The accuracy of the temperature sensors is higher than that of the similar pin compatible devices on the market, and the typical accuracy of +/-0.5 ℃ and +/-1 ℃ can be kept in the temperature range of 0 ℃ to +70 ℃. The precision of the series of devices is improved, and the series of devices can be suitable for a plurality of analog temperature detection applications. Flexible PMIC. The TMP235 device provides a positive slope output of 10 mV/deg.C over the full temperature range of-40 deg.C to +150 deg.C and the 2.3V to 5.5V supply voltage range. The TMP236 sensor with higher gain is at a temperature of-10 ℃ to +125 ℃.

The range and the 3.1V to 5.5V supply voltage range provide a positive slope output of 19.5 mV/deg.C.

The invention is further illustrated with reference to the following figures and examples.

Referring to fig. 1, a temperature detection circuit board 100, one side of the circuit board 100 is painted with a temperature detection circuit 110, and the other side is provided with a heat transfer sheet 120, the temperature detection circuit 110 includes a temperature sensor circuit 111, and the heat transfer sheet 120 corresponds to a thermal resistor 1111 in the temperature sensor circuit 111;

a heat transfer sheet for contacting the heating source and absorbing heat and transferring the heat to the thermistor through the circuit board;

and the temperature sensor circuit is used for detecting the temperature of the heating source through the thermal resistor.

According to the temperature control circuit board provided by the embodiment of the invention, the measurement of the temperature sensor is realized by the heat transfer sheet, when heating is carried out, only the heating source is put on the heat transfer sheet, the thermal resistor on the back of the heat transfer sheet can be uniformly heated, so that the temperature rise is realized, and the circuit characteristic can be measured by the change of the output voltage of the sensor. For teachers, the characteristic change of the sensor can be demonstrated for students in a classroom when the temperature changes, and the teaching desk is convenient and quick. For students, the influence of temperature change on output signals can be quickly seen, and if circuit faults occur, the resistance value of the thermal resistor can be changed through the heat transfer sheet so as to change input signals, and quick judgment can be carried out.

As a further improvement of the embodiment, the invention provides another temperature detection circuit board, one side of the circuit board is painted with a temperature detection circuit, and the other side is provided with a heat transfer sheet, the temperature detection circuit comprises a temperature sensor circuit, and the heat transfer sheet corresponds to the position of a thermal resistor in the temperature sensor circuit;

a heat transfer sheet for contacting the heating source and absorbing heat and transferring the heat to the thermistor through the circuit board;

and the temperature sensor circuit is used for detecting the temperature of the heating source through the thermal resistor.

Further, in some optional embodiments, the heat transfer sheet is a metal heat transfer sheet, and the metal heat transfer sheet is fastened, so that heat transfer is uniform and rapid. The metal heat transfer sheet is welded on the circuit board, and is firm in welding mode and not easy to fall off.

In some optional embodiments, the temperature detection circuit includes at least one dial switch, as shown in fig. 2, where the dial switch is connected to a component of the temperature detection circuit, and the dial switch is used to select an operating state of the component in the temperature detection circuit.

In practical applications, in some optional embodiments, the dial switch may include a two-bit dial switch, the two-bit dial switch is connected to a resistor with a fixed resistance value and/or a capacitor with a fixed capacitance value, the first bit controls whether the resistor and/or the capacitor connected to the first bit is short-circuited, and the second bit controls whether the resistor and/or the capacitor connected to the second bit is connected to the circuit. Fig. 3 is a schematic diagram of a two-bit toggle switch with a capacitor of a fixed capacitance value.

The working state of the resistor with fixed resistance or the capacitor with fixed capacitance is shown in the following table:

in addition, as shown in fig. 4, in some optional embodiments, the dial switch may further include a three-position dial switch, the three-position dial adjustable potentiometer is connected, the adjustable potentiometer includes an adjustable resistor and a fixed resistor, the first position controls whether the adjustable resistor of the connection is short-circuited, the second position controls whether the adjustable resistor of the connection is connected to the circuit, and the third position controls whether the fixed resistor of the connection is short-circuited. The working state of the adjustable potentiometer is shown as the following table:

it should be understood that besides the above components, dial switches can be added to other components according to teaching requirements, so as to conveniently adjust parameters of the whole circuit.

In a preferred implementation manner, the dial switches in the above embodiments all adopt patch type dial switches, and the patch type dial switches have high packaging density, small volume, and light weight, and have the following advantages: high reliability and strong vibration resistance. The welding spot defect rate is low. The high frequency characteristics are good. Electromagnetic and radio frequency interference is reduced. The automation is easy to realize, and the production efficiency is improved. The cost is reduced by 30-50%. Saving materials, energy, equipment, manpower and time.

According to the other temperature detection circuit board provided by the embodiment of the invention, a heat transfer sheet can be welded on the circuit board. The resistance value of the temperature sensor can be changed only by welding the components closely to the back of the circuit board and heating the metal heat transfer sheet on the front side of the circuit board, and the circuit board is uniform in heating and easy to operate due to the heat conduction characteristic of the circuit board.

The working states of the components, including the working states of open circuit, short circuit and the like of the components are controlled through the dial switch, and then the adjustment of circuit parameters is realized. The dial switch is convenient for teachers to set faults in the circuit, the circuit does not need to be disassembled or reconnected, and the like, so that the teachers can conveniently teach. Meanwhile, students can use dial switches to adjust circuit parameters according to own settings, and the functions of components in the circuit are verified. Has important significance for the practical analysis ability of students.

For the teacher: the hand is not required to be provided with a hot air gun, and the condition that the temperature sensor is permanently damaged due to improper operation of a student if the student uses an electric iron is also not required to be worried.

For a student: the change that can more convenient study temperature sensor plays the effect to the circuit, easy operation only needs to place the flatiron on the metal heat transfer piece, can accomplish temperature sensor's heating, in addition, if with the metal heat transfer piece towards the fan, because metal heat transfer piece area of contact is big, can also play quick radiating purpose for the heat dissipation saves the test time.

In one embodiment, the invention further provides an electronic device, and the electronic device uses the circuit board mentioned in the above embodiment.

In one embodiment, the present invention further provides a temperature control system 50, as shown in fig. 3, comprising:

a heater 51 for changing a system temperature;

a temperature sensor 52 for measuring the system temperature;

a heat transfer sheet 53 for contacting the heater 51 and absorbing heat and transferring the heat to the temperature sensor 52 through the circuit board;

and a controller 54 for controlling the operation state of the heater according to the measurement data of the temperature sensor 52.

As an optional implementation manner of the temperature control system, the temperature control system further includes a heat dissipation fan 55, where the heat dissipation fan is disposed at the heat transfer sheet and connected to the controller, and is used for dissipating heat from the heat transfer sheet under the control of the controller. The heat dissipation can be accelerated due to the large area of the heat transfer sheet.

For example, if the temperature setting switch is operated at T1, if the switch has no hysteresis characteristic, the electric heater is turned off and the temperature drops when the temperature is reached, and the electric heater is turned on when the temperature is lower than the temperature. The heater is thus frequently switched on and off around this temperature, and oscillates around the critical region, so that the temperature-controlled switch is generally characterized by hysteresis. When the temperature difference control circuit is applied to controlling the opening and closing of a fan, a fan switch generally has the characteristic of hysteresis, and a certain temperature difference, namely a recovery error, exists between an action (turn-off) temperature TH and a reset (turn-on) temperature TL.

Aiming at the limitation of the heating mode of the temperature sensor, a heating point capable of uniformly and conveniently heating the temperature sensor is designed, as shown in fig. 6, the heating point is an operational amplifier hysteresis control circuit in a temperature control system. In the operational amplifier hysteresis control circuit, a temperature sensor circuit converts a measured temperature signal into a voltage signal and outputs the voltage signal to a signal amplification circuit, the voltage signal corresponding to a temperature value is amplified and then output to an A/D conversion circuit, the voltage signal is converted into a digital quantity and sent to a single chip microcomputer system, and the single chip microcomputer system processes the digital quantity according to display requirements and then sends the digital quantity to a temperature display system for display. The circuit simulates a temperature control system of a water dispenser and has two turning threshold values. Such as: the set switch off temperature is less than 25 ℃, the reset switch on temperature is more than 28 ℃, and the return error can be adjusted according to the requirement, so that the problem of frequent switch-on and switch-off of the fan switch is solved. The process of switching on and switching off and switching on along different paths without walking around is called a hysteresis control process of the fan. The hysteresis control can prevent the equipment from being opened and closed frequently when the temperature is changed around a value, so that the equipment is burnt out.

In the operational hysteresis control circuit board, the TMP235 is welded on the back of the circuit board, a metal pad on the front side, namely a heat transfer sheet, is heated by an electric iron, the heating temperature of the metal pad rises, so that the TMP235 temperature sensor on the back of the circuit board is heated, and the resistance value of the temperature sensor is changed, so that the waveform of an output signal is influenced. When the temperature is higher than the upper limit of the temperature of the circuit board, the output signal is at low level, and when the temperature is lower than the lower limit of the temperature of the circuit board, the output signal is at high level.

In some alternative embodiments, when there are multiple input temperatures, it is necessary to compare the input temperatures and then determine the final output, so that the embodiment of the present invention further provides a maximum value comparison output circuit, as shown in fig. 7. Illustratively, in the maximum value comparison output circuit board, one of the soldering irons is adjusted to 300 ℃ and the other soldering iron is adjusted to 350 ℃, heating points adjacent to the input A and the input B are respectively heated, at the moment, the two temperature sensors simultaneously input, the circuit judges, and an input signal of the maximum temperature value is screened out for output.

According to the temperature control system provided by the embodiment of the invention, the heat transfer sheet is used for heating and radiating the temperature sensor, when the temperature sensor is heated, the resistor on the back of the heat transfer sheet can be uniformly heated only by heating the heater, so that the temperature is increased, and the circuit characteristics of the temperature sensor can be measured through the change of the output voltage of the sensor. When radiating, only need to face the fan with the heat transfer piece for air flow can realize quick heat dissipation, and traditional temperature sensor directly faces the fan, and the area of receiving the wind is little, and the heat dissipation is slow, and the time is longer.

In one embodiment, the present invention provides an electrical appliance comprising the temperature control system mentioned in the above embodiments.

It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.

It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.

Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.

It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.

In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.

In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.