CN207557710U - The temperature-adjusting circuit of heating chip based on itself thermometric - Google Patents
The temperature-adjusting circuit of heating chip based on itself thermometric Download PDFInfo
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- CN207557710U CN207557710U CN201721446018.XU CN201721446018U CN207557710U CN 207557710 U CN207557710 U CN 207557710U CN 201721446018 U CN201721446018 U CN 201721446018U CN 207557710 U CN207557710 U CN 207557710U
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Abstract
The utility model proposes a kind of temperature-adjusting circuit of the heating chip based on itself thermometric, including heating chip, microcontroller, switching pedal, current detection circuit, voltage detecting circuit, constant power source and power control switching circuit；Switching pedal is connected with power switching circuitry；Power switching circuitry connects constant power source；Respectively with Switching Power Supply, current detection circuit is connected constant power source with voltage detecting circuit；Current detection circuit and heating chip-in series；Voltage detecting circuit is in parallel with heating chip；Voltage detecting circuit connects the SPI communication interface of microcontroller with current detection circuit by AD conversion chip respectively；It is integrated using heating chip, has abandoned the independent extra soldered of thermocouple, reduced the requirement to manufacturing process, be conducive to improve thermal resistance to the response time of temperature, create conditions for high accuracy temperature control；Integrated circuit is simple in structure, and integrated level is high, has fundamentally prevented conducting wire oxidation, has collapsed, be easy to cause the phenomenon that loose contact.
Description
Technical field
The utility model is related to endoscopic electrode heating control technology field, more particularly to a kind of adding based on itself thermometric
The temperature-adjusting circuit of hot chip.
Background technology
It is looked at straight down currently based on endoscope, heat is carried out to patient's gastric mucosa or intestinal mucosa oozing of blood or protuberance property minimal disease
The temperature control method for the equipment coagulated, burn or gasified be heating head together with thermocouple welding, by thermocouple into trip temperature survey
Amount reaches the target for reaching treatment head and stablizing in completion treatment temperature by carrying out computer heating control to heating head.
Above scheme has following deficiency：Wire count needed for above scheme for 4, two for heat, two for heat
Galvanic couple.Difficulty is caused in heating head technique manufacture.Above scheme proposes the welding procedure of thermocouple and heating head very high want
It asks；And after long-time use, since thermocouple is often heated, the conducting wire that thermocouple is connected is susceptible to more serious
There is aging after conducting wire oxidation, collapses, be easy to cause loose contact in oxidative phenomena.
Utility model content
The purpose of this utility model is intended at least solve one of described technological deficiency.
To achieve these goals, the embodiment of the utility model one side provides a kind of heating core based on itself thermometric
The temperature-adjusting circuit of piece, including heating chip, microcontroller, switching pedal, current detection circuit, voltage detecting circuit, constant power source
With power control switching circuit；The switching pedal is connected with the control terminal of power switching circuitry；The power switching circuitry
Output terminal connects constant power source；Constant power source one end connecting valve power supply, the other end connect respectively current detection circuit and
Voltage detecting circuit；The current detection circuit and heating chip-in series；The voltage detecting circuit is in parallel with heating chip；Institute
State the SPI communication interfaces that voltage detecting circuit connects microcontroller with the output terminal difference AD conversion chip of current detection circuit；Institute
State the input control end of the PWM output pins connection power control switching circuit of microcontroller.
Preferably, the power switching circuitry includes power switching chip, the first field-effect tube；The power switches chip
Control terminal connection switching pedal, the output terminal of power switching chip connects the positive input of the first operational amplifier,
And connect the drain electrode of the first field-effect tube；The PWM pins of the grid connection microcontroller of first field-effect tube.
Further, the current detection circuit includes sampling resistor and current monitor；The sampling resistor connect into plus
In the power supply circuit of hot chip；The sampling resistor both ends respectively with the normal phase input end of current monitor and inverting input phase
Connection；The output terminal of the current monitor is connected by connecting AD conversion chip with microcontroller input pin.
Further, the sample circuit further includes voltage detecting circuit；The voltage detecting circuit includes the first partial pressure electricity
Resistance and the second divider resistance；First divider resistance is connected with the second divider resistance, the tandem junction of two divider resistances
It is grounded after structure is in parallel with heating chip.
Preferably, the constant power source provides 24V direct currents by Switching Power Supply；The constant power source is put including the first operation
Big device, multiplier, the second field-effect tube；The input terminal of the multiplier connect respectively voltage detecting circuit voltage output end and
The current output terminal of current detection circuit, the output terminal of the multiplier connect the feedback pin of the first operational amplifier；It is described
The output terminal that the grid of second field-effect tube passes through the first operational amplifier of connection；The source electrode connection of second field-effect tube adds
Hot chip input terminal.
Preferably, the model TP40 of the heating chip.
Preferably, the model DSPIC33EP512MC502 of the microcontroller.
Further, the output terminal of one end connection current distributing monitor of first divider resistance, is converted to voltage value
After input AD conversion chip.
According to a kind of temperature-adjusting circuit of heating chip based on itself thermometric of the utility model embodiment, compared to tradition
Three-wire system or four-wire system use thermocouple heating endoscopic electrode, have at least the following advantages：
1st, it is integrated using heating chip and microcontroller, by the four-wire system of original thermoae head, is reduced to double wire system, it will
Originally the form of two heating wires circuit boards of connection thermocouple is realized, simplifies circuit structure；
2nd, the independent extra soldered of thermocouple has been abandoned, has reduced the requirement to manufacturing process, and has heated acquisition integrally to have
Conducive to thermal resistance is improved to the response time of temperature, create conditions for high accuracy temperature control；
3rd, the difference between different chips is eliminated by the use of constant power source as temperature controlled power source；
4th, integrated circuit is simple in structure, and integrated level is high, has fundamentally prevented the aging, collapse, appearance of conducting wire oxidation appearance
The phenomenon that easily causing loose contact.
The additional aspect of the utility model and advantage will be set forth in part in the description, partly will be from following description
In become apparent or recognized by the practice of the utility model.
Description of the drawings
The above-mentioned and/or additional aspect and advantage of the utility model will in the description from combination accompanying drawings below to embodiment
Become apparent and be readily appreciated that, wherein：
Fig. 1 is the circuit structure of the temperature-adjusting circuit of the heating chip based on itself thermometric that the utility model embodiment provides
Figure；
Fig. 2 is the circuit diagram of sample circuit part that the utility model embodiment provides；
Fig. 3 is the circuit diagram of single chip part that the utility model embodiment provides；
Fig. 4 is the circuit diagram of the temperature-adjusting circuit of the heating chip shown in FIG. 1 based on itself thermometric；
Specific embodiment
The embodiment of the utility model is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning
Same or similar element is represented to same or similar label eventually or there is the element of same or like function.Below by ginseng
The embodiment for examining attached drawing description is exemplary, it is intended to for explaining the utility model, and it is not intended that the utility model
Limitation.
The utility model heating chip heated for controlling temperature principle is, thermal control temperature chip be it is a kind of collect heating and temperature acquisition in
The chip of one, chip both ends can measure fixed resistance value at the same temperature, and heating power, chip are provided at chip both ends
Meeting spontaneous heating, with the raising of chip self-temperature, the resistance value at chip both ends is with the linear increase of temperature.To the temperature of chip fever
Degree control is then to be scaled actual temperature by the real-time sampling to chip both ends resistance value, brings PID into and adjusts formula, calculates core
Piece both ends load the duty ratio of heating power, so as to which the temperature of control chip heating in real time realizes the temperature control of chip fever.
As shown in Figure 1, a kind of temperature-adjusting circuit of heating chip based on itself thermometric of the utility model embodiment, including
Heat chip U1, microcontroller U2, switching pedal, current detection circuit, voltage detecting circuit, constant power source 2 and power switching control
Circuit 3 processed；Switching pedal is connected with the control terminal of power switching circuitry 3；The output terminal connection invariable power of power switching circuitry 3
Source 2；2 one end connecting valve power supply of constant power source, the other end connect current detection circuit and voltage detecting circuit respectively；Electric current is examined
Slowdown monitoring circuit is connected with heating chip U1；Voltage detecting circuit is in parallel with heating chip；Voltage detecting circuit and current detection circuit
Output terminal respectively pass through AD conversion chip connect microcontroller SPI communication interfaces；For obtaining being loaded into heating core on piece
Voltage, current parameters, more than parameter are used for the composition of constant power source and access AD conversion chip.The PWM output pins of microcontroller
Connect the input control end of power control switching circuit.The duty ratio of the pwm signal control output power of microcontroller output.
As shown in Fig. 2, power switching circuitry includes power switching chip, the first field-effect tube (Q1)；Power switches chip
Control terminal connection switching pedal, power switching chip output terminal connect the first operational amplifier (A2) positive input,
And connect the drain electrode of the first field-effect tube；The grid of first field-effect tube is managed by the PWM that connection drives resistance to connect microcontroller
Foot.
Switching pedal inputs for switching high level input and low level；When pushes pedals input high level, power is cut
Chip COM pins output high level is changed, the positive input of operational amplifier A 2 is high level at this time, therefore operational amplifier A 2
Output terminal for high level output, the output terminal of operational amplifier A 2 drives resistance by connection, the second field-effect tube of connection
Grid, the second field-effect tube Q2 conductings, heating chip U1 are begun to warm up.
As shown in Fig. 2, current detection circuit 101 includes sampling resistor R1, current monitor A1；Sampling resistor R1 one end
Connect high level output end；Sampling resistor both ends are connected respectively with current monitor A1 normal phase input ends and inverting input；
Voltage detecting circuit 102；Voltage detecting circuit includes the first divider resistance R2 and the second divider resistance R3；First point
Piezoresistance R2 connects with the second divider resistance R3, first divider resistance R2 other ends connection heating chip U1, the second divider resistance
The other end ground connection of R3.
Constant power source includes the first operational amplifier A 2, multiplier U3；The input terminal of the multiplier U3 connects respectively to be adopted
The voltage output end and current output terminal of sample electric current, the output terminal of the multiplier U3 connect the anti-of the first operational amplifier A 2
Phase input terminal.
As shown in Fig. 2, determine power gear by setting voltage, chip will be added in after voltage and partial pressure that current sense goes out
The voltage at both ends is multiplied by multiplier, and the result feedback operational amplifier obtained forms constant power output.It should be noted that
Due to the electric current that the positive input of the first operational amplifier is input, acquisition is needed to be switched to after high level to heating core at this time
Piece carries out heating actual current, due to the voltage value of the positive input of operational amplifier and the voltage value phase of inverting input
Deng, therefore, the inverting input of the Feedback of Power that calculates that electric current is multiplied with voltage by multiplier to operational amplifier, by
This ensures that the power that practical power is set with input terminal is consistent.
As shown in figure 3, select the relatively low resistance of resistance value, preferably 0.1 Europe to improve the first divider resistance of sampling precision
The sampling resistor of nurse, the first divider resistance input AD conversion chip by current distributing monitor after being converted to voltage value.Voltage
Sampling will load the voltage value electric resistance partial pressure at heating chip both ends by the way of electric resistance partial pressure, by 1/5 input of voltage
AD conversion chip.Current sample is sensed using high side electric current, is turned using 0.1 ohm of sampling resistor by current distributing monitor
Voltage value is changed into AD conversion chip.Two AD conversion chips input after collected voltage and current value is amplified
Microcontroller, by setting PWM value according to resistance calculations, PID calculation formula in microcontroller, so as to be cut using PWM control power
It changes, realizes the temperature by the way that power is controlled to realize control heating chip.
It should be noted that high-power output and low-power output are to measure the chip under the two states of heating chip
Resistance value；When i.e. low-power exports, heating chip does not generate heat, at this time under non-heated state requirement to the cold-state resistance of chip into
Row measures.It requires to reach set temperature as early as possible in a heated state and be kept for temperature specified time.In order to complete requirements above
In the control of chip by the way of constant power source, collected voltage and current value is divided by obtain resistance value, by resistance
Value is compareed to obtain the corresponding temperature of chip with the resistance value temperature table of comparisons.Under non-heated state, it is contemplated that the power of loading
Chip cannot be heated to actual use 300mW, duty ratio, which is set as 4%, will not improve the temperature of chip in actual test.
Under heated condition, in order to accelerate heating speed using 1.2W, reached by PID adjusting formula control duty ratios and be heated to set temperature
Purpose.
Heat the model TP40 of chip；The model dsPIC33EP512MC502 of microcontroller is it should be noted that this reality
The citing for the model that chip and microcontroller are heated in example is applied, is not limited to the example above, can also be other modes, it is no longer superfluous herein
It states.
As shown in figure 4, the output terminal of current detection circuit and voltage detecting circuit is accessed into PID controller, according to acquisition
Voltage value and current value according to common-used formula, such as：Resistance value calculation formula：R=A* (V/I) formula 1；Wherein, parameter A is
Correction value corrects the fixed error on distinct device.
Resistance value and temperature value exchangeable formulas
T=Tlt [n-1]+(Tlt [n]-Tlt [n-1]) ((Rin-Rlt [n-1])/Rlt [n]-Rlt [n-1])；
R=Rlt [n-1]+(Rlt [n]-Rlt [n-1]) ((Tin-Tlt [n-1])/Tlt [n]-Tlt [n-1])；Formula 2
PID control formula
OUT [n]=OUT [n-1]+A*His [n]+B*His [n-1]+C*His [n-2] formula 3
Wherein,
His [n]=SetR [n]-R [n]
A=Kp+Ki+Kd
B=- (Kp+2*Kd)
C=Kd
Pid parameter is obtained after PID controller is corrected, then pid parameter is inputted into microcontroller, microcontroller is joined according to gained
The duty ratio of number adjustment PWM, so as to which power switching device be controlled to carry out power switching.
In the description of this specification, reference term " one embodiment ", " example ", " is specifically shown " some embodiments "
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment or example of the utility model.In the present specification, to the schematic table of above-mentioned term
It states and may not refer to the same embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be
It is combined in an appropriate manner in any one or more embodiments or example.
Although the embodiment of the utility model has been shown and described above, it is to be understood that above-described embodiment is
Illustratively, it is impossible to be construed as a limitation of the present invention, those of ordinary skill in the art are not departing from the utility model
Principle and objective in the case of above-described embodiment can be changed in the scope of the utility model, change, replace and
Modification.The scope of the utility model is by appended claims and its equivalent limits.
Claims (8)
1. a kind of temperature-adjusting circuit of the heating chip based on itself thermometric, which is characterized in that including heating chip, microcontroller, cut
Change pedal, current detection circuit, voltage detecting circuit, constant power source and power control switching circuit；The switching pedal and work(
The control terminal of rate switching circuit is connected；The power switching circuitry output terminal connects constant power source；Described constant power source one end
Connecting valve power supply, the other end connect current detection circuit and voltage detecting circuit respectively；The current detection circuit and heating
Chip-in series；The voltage detecting circuit is in parallel with heating chip；The output of the voltage detecting circuit and current detection circuit
End connects the SPI communication interfaces of microcontroller by AD conversion chip respectively；The PWM output pins connection power of the microcontroller is cut
Change the input control end of control circuit.
2. the temperature-adjusting circuit of the heating chip according to claim 1 based on itself thermometric, which is characterized in that the power
Switching circuit includes power switching chip, the first field-effect tube；The control terminal connection switching pedal of the power switching chip, institute
The output terminal for stating power switching chip connects the positive input of the first operational amplifier, and connects the leakage of the first field-effect tube
Pole；The PWM pins of the grid connection microcontroller of first field-effect tube.
3. the temperature-adjusting circuit of the heating chip according to claim 2 based on itself thermometric, which is characterized in that the electric current
Detection circuit includes sampling resistor and current monitor；The sampling resistor connect heating chip power supply circuit in；It is described
Sampling resistor both ends are connected respectively with the normal phase input end of current monitor and inverting input；The current monitor it is defeated
Outlet is connected by connecting AD conversion chip with microcontroller input pin.
4. the temperature-adjusting circuit of the heating chip according to claim 2 based on itself thermometric, which is characterized in that the voltage
Detection circuit includes the first divider resistance and the second divider resistance；First divider resistance is connected with the second divider resistance, and two
It is grounded after the cascaded structure of a divider resistance is in parallel with heating chip.
5. the temperature-adjusting circuit of the heating chip according to claim 1 based on itself thermometric, which is characterized in that the perseverance work(
Rate source provides 24V direct currents by Switching Power Supply；The constant power source includes the first operational amplifier, multiplier, the second field-effect
Pipe；The input terminal of the multiplier connects the electric current output of the voltage output end and current detection circuit of voltage detecting circuit respectively
End, the output terminal of the multiplier connect the feedback pin of the first operational amplifier；The grid connection of second field-effect tube
The output terminal of first operational amplifier；The source electrode connection heating chip input terminal of second field-effect tube.
6. the temperature-adjusting circuit of the heating chip according to claim 1 based on itself thermometric, which is characterized in that the heating
The model of chip：TP40.
7. the temperature-adjusting circuit of the heating chip according to claim 1 based on itself thermometric, which is characterized in that the monolithic
The model DSPIC33EP512MC502 of machine.
8. the temperature-adjusting circuit of the heating chip according to claim 4 based on itself thermometric, which is characterized in that described first
The output terminal of one end connection current distributing monitor of divider resistance, AD conversion chip is inputted after being converted to voltage value.
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| CN201721446018.XU CN207557710U (en) | 2017-11-02 | 2017-11-02 | The temperature-adjusting circuit of heating chip based on itself thermometric |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721446018.XU CN207557710U (en) | 2017-11-02 | 2017-11-02 | The temperature-adjusting circuit of heating chip based on itself thermometric |
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| CN207557710U true CN207557710U (en) | 2018-06-29 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110681835A (en) * | 2019-11-18 | 2020-01-14 | 华北理工大学 | Continuous casting mold flux temperature control device |
| CN111580582A (en) * | 2020-05-18 | 2020-08-25 | 绿烟实业（深圳）有限公司 | Control circuit and control method capable of achieving zone temperature control and electronic cigarette heating device |
| CN112347718A (en) * | 2020-10-28 | 2021-02-09 | 山东超越数控电子股份有限公司 | Board level heating circuit, PCB board and computer of adjustable power |
| CN113543376A (en) * | 2021-06-24 | 2021-10-22 | 苏州浪潮智能科技有限公司 | Heating circuit board based on edge server |
-
2017
- 2017-11-02 CN CN201721446018.XU patent/CN207557710U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110681835A (en) * | 2019-11-18 | 2020-01-14 | 华北理工大学 | Continuous casting mold flux temperature control device |
| CN110681835B (en) * | 2019-11-18 | 2023-09-08 | 天津理工大学 | Continuous casting mold flux temperature control device |
| CN111580582A (en) * | 2020-05-18 | 2020-08-25 | 绿烟实业（深圳）有限公司 | Control circuit and control method capable of achieving zone temperature control and electronic cigarette heating device |
| CN112347718A (en) * | 2020-10-28 | 2021-02-09 | 山东超越数控电子股份有限公司 | Board level heating circuit, PCB board and computer of adjustable power |
| CN113543376A (en) * | 2021-06-24 | 2021-10-22 | 苏州浪潮智能科技有限公司 | Heating circuit board based on edge server |
| CN113543376B (en) * | 2021-06-24 | 2023-07-14 | 苏州浪潮智能科技有限公司 | Heating circuit board based on edge server |
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