CN109375670A - Closed loop thermal control system and closed loop thermal control method without temperature sensor - Google Patents
Closed loop thermal control system and closed loop thermal control method without temperature sensor Download PDFInfo
- Publication number
- CN109375670A CN109375670A CN201811002401.5A CN201811002401A CN109375670A CN 109375670 A CN109375670 A CN 109375670A CN 201811002401 A CN201811002401 A CN 201811002401A CN 109375670 A CN109375670 A CN 109375670A
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- Prior art keywords
- heating wire
- closed loop
- sampling module
- thermal control
- loop thermal
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- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Control Of Resistance Heating (AREA)
Abstract
The invention discloses the closed loop thermal control system of no temperature sensor and closed loop thermal control methods, system includes power module, heating wire, switching tube, sampling module, microcontroller and operational amplification circuit, heating wire, switching tube, sampling module are in turn connected to form a branch, the anode of one end connection power module in the branch where heating wire, the cathode of one end connection power module where sampling module, microcontroller is separately connected power module and switching tube, the input terminal of operational amplifier connects microcontroller, and output end connects sampling module.Whole system of the present invention avoids setting temperature sensor, pass through setting heating wire and sampling module, the resistance value of voltage acquisition and acquisition sampling module to heating wire and sampling module, to get the increased resistance value of heating wire, the temperature value of heating wire is obtained according to the corresponding temperature-coefficient of electrical resistance of existing metal.
Description
Technical field
The present invention relates to a kind of temperature control technology more particularly to a kind of closed loop thermal control systems of no temperature sensor
And closed loop thermal control method.
Background technique
Currently, the technological means commonly used for temperature measurement aspect is exactly to install one on the device for needing to measure
Temperature sensor detects its operating temperature by temperature sensor, then is transmitted to controller processing output numerical value.This detection side
Formula must have temperature sensor first, next is needed temperature sensor
But existing detection mode has the following deficiencies:
(1) it must have temperature sensor, bring certain cost problem；
(2) need to install temperature sensor it is in place just there is detection validity, and some devices are generally difficult to
Mounting temperature sensor, the problem for bringing installation inconvenient.
Summary of the invention
For overcome the deficiencies in the prior art, it is an object of the present invention to the controls of the closed loop thermal of no temperature sensor
System, it is at low cost, temperature detection is realized in the case where not having temperature sensor.
The second object of the present invention is the closed loop thermal control method of no temperature sensor, at low cost, does not have temperature
Temperature detection is realized in the case where degree sensor.
An object of the present invention adopts the following technical scheme that realization:
Closed loop thermal control system without temperature sensor, including it is power module, heating wire, switching tube, sampling module, micro-
Controller and operational amplification circuit, heating wire, switching tube, sampling module are in turn connected to form a branch, heating wire in the branch
The anode of one end connection power module at place, the cathode of one end connection power module where sampling module, microcontroller point
Not Lian Jie power module and switching tube, the input terminal of operational amplifier connects microcontroller, and output end connects sampling module.
Further, the switching tube is metal-oxide-semiconductor.
Further, sampling module is sampling resistor.
The second object of the present invention is implemented with the following technical solutions:
Closed loop thermal control method without temperature sensor is applied to one of the object of the invention closed loop thermal control system,
Include the following steps:
S1: initial p WM duty ratio is arranged in microcontroller, and heating wire is made to work on power；
S2: microcontroller obtains the first voltage of power module and the second voltage of sampling module, and in sampling module
Known to sampling resistor value；
S3: the heating electric resistance value of heating wire being calculated according to the first voltage, second voltage and sampling resistor value, then
The heating resistor changing value of heating wire is calculated in conjunction with the initial resistivity value of heating wire；
S4: the temperature of current heating wire is obtained according to heating resistor changing value and the corresponding temperature-coefficient of electrical resistance of heating wire
Value judges that the operating temperature whether within the scope of set temperature, if so, returning to S2, otherwise, executes S5；
S5: microcontroller exports new PWM duty cycle again makes heating wire work on power.
Preferably, sampling module is sampling resistor.
Compared with prior art, the beneficial effects of the present invention are:
Whole system of the present invention avoids setting temperature sensor, by setting heating wire and sampling module, to heating wire and
The voltage acquisition of sampling module and the resistance value for acquiring sampling module, so that the resistance value of heating wire is got, according to existing
The corresponding temperature-coefficient of electrical resistance of metal obtain the temperature value of heating wire.
Detailed description of the invention
Fig. 1 is circuit structure diagram of the invention；
Fig. 2 is flow chart of the invention.
Specific embodiment
In the following, being described further in conjunction with attached drawing and specific embodiment to the present invention, it should be noted that not
Under the premise of conflicting, new implementation can be formed between various embodiments described below or between each technical characteristic in any combination
Example.
As shown in Figure 1, the present invention provides a kind of closed loop thermal control system of no temperature sensor comprising power supply mould
Block, heating wire, switching tube, sampling module, microcontroller and operational amplification circuit, heating wire, switching tube, sampling module successively connect
It connects to form a branch, the anode of one end connection power module in the branch where heating wire, one end where sampling module connects
The cathode of power module is connect, microcontroller is separately connected power module and switching tube, and the input terminal of operational amplifier connects micro-control
Device processed, output end connect sampling module.The on-off of microcontroller output pwm signal control switch pipe.Operational amplification circuit is read
Amplifier voltage from microcontroller, by the voltage amplification of sampling resistor.
As preferred embodiment, switching tube is metal-oxide-semiconductor.Sampling module is sampling resistor.
The operation principle of the present invention is that, it is assumed that the voltage of power module is V1, and the voltage of sampling resistor is V2, sampling resistor
Resistance be R1, it is known quantity, R1 is known that the resistance of heating wire, which is that R2, V1 and V2 can be obtained by microcontroller measurement,
It is worth, then R2=(V1-V2)/(V1/R1).
According to the metal properties of heating wire and the available operating temperature of corresponding temperature-coefficient of electrical resistance, metal is in not
Resistivity is different (resistance is different when one section of metal of same length is in different temperatures) when synthermal, i.e., electric
The size of resistance has correlation with temperature, and a circuit system can identify wire resistance while heating to wire
The control of temperature can be thus achieved in variation.Temperature-coefficient of electrical resistance is the prior art, can be obtained by inspection information, such as following table:
As shown in Fig. 2, being applied to closed loop thermal control the present invention also provides the closed loop thermal control method of no temperature sensor
System processed, includes the following steps:
S1: initial p WM duty ratio is arranged in microcontroller, and heating wire is made to work on power；
S2: microcontroller obtains the first voltage of power module and the second voltage of sampling module, and in sampling module
Known to sampling resistor value；
S3: the heating electric resistance value of heating wire being calculated according to the first voltage, second voltage and sampling resistor value, then
The heating resistor changing value of heating wire is calculated in conjunction with the initial resistivity value of heating wire；The initial resistivity value of heating wire is known
Amount；
S4: the temperature of current heating wire is obtained according to heating resistor changing value and the corresponding temperature-coefficient of electrical resistance of heating wire
Value judges that the operating temperature whether within the scope of set temperature, if so, returning to S2, otherwise, executes S5；
S5: microcontroller exports new PWM duty cycle again makes heating wire work on power.
Likewise, sampling module is sampling resistor.
The working principle of the closed loop thermal control method is identical as closed loop thermal control system, all assumes that power module
Voltage is V1, and the voltage of sampling resistor is V2, and the resistance of sampling resistor is R1, and the resistance of heating wire is that R2, V1 and V2 can lead to
It crosses microcontroller measurement to obtain, is known quantity, R1 is given value, then R2=(V1-V2)/(V1/R1).
The above embodiment is only the preferred embodiment of the present invention, and the scope of protection of the present invention is not limited thereto,
The variation and replacement for any unsubstantiality that those skilled in the art is done on the basis of the present invention belong to institute of the present invention
Claimed range.
Claims (5)
1. the closed loop thermal control system without temperature sensor, which is characterized in that including power module, heating wire, switching tube, adopt
Egf block, microcontroller and operational amplification circuit, heating wire, switching tube, sampling module are in turn connected to form a branch, the branch
The anode of one end connection power module where middle heating wire, the cathode of one end connection power module where sampling module are micro-
Controller is separately connected power module and switching tube, and the input terminal of operational amplifier connects microcontroller, output end connection sampling
Module.
2. closed loop thermal control system as described in claim 1, which is characterized in that the switching tube is metal-oxide-semiconductor.
3. closed loop thermal control system as described in claim 1, which is characterized in that sampling module is sampling resistor.
4. the closed loop thermal control method without temperature sensor, which is characterized in that be applied to closed loop thermal described in claim 1
Control system includes the following steps:
S1: initial p WM duty ratio is arranged in microcontroller, and heating wire is made to work on power；
S2: microcontroller obtains the first voltage of power module and the second voltage of sampling module, and the sampling in sampling module
Known to resistance value；
S3: the heating electric resistance value of heating wire being calculated according to the first voltage, second voltage and sampling resistor value, in conjunction with
The heating resistor changing value of heating wire is calculated in the initial resistivity value of heating wire；
S4: obtaining the temperature value of current heating wire according to heating resistor changing value and the corresponding temperature-coefficient of electrical resistance of heating wire,
Judge that the operating temperature whether within the scope of set temperature, if so, returning to S2, otherwise, executes S5；
S5: microcontroller exports new PWM duty cycle again makes heating wire work on power.
5. closed loop thermal control method as claimed in claim 4, which is characterized in that sampling module is sampling resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811002401.5A CN109375670A (en) | 2018-08-30 | 2018-08-30 | Closed loop thermal control system and closed loop thermal control method without temperature sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811002401.5A CN109375670A (en) | 2018-08-30 | 2018-08-30 | Closed loop thermal control system and closed loop thermal control method without temperature sensor |
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| CN109375670A true CN109375670A (en) | 2019-02-22 |
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| CN201811002401.5A Pending CN109375670A (en) | 2018-08-30 | 2018-08-30 | Closed loop thermal control system and closed loop thermal control method without temperature sensor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109998182A (en) * | 2019-05-28 | 2019-07-12 | 珠海市香之君科技股份有限公司 | A kind of heating means of electronic cigarette |
| CN113950867A (en) * | 2019-05-29 | 2022-01-18 | 捷温有限责任公司 | Device for determining the temperature of a resistance heating device |
| CN115250549A (en) * | 2022-09-22 | 2022-10-28 | 广州中基国威电子科技有限公司 | Heating control method, heating control circuit and heating device |
| CN115864302A (en) * | 2023-02-06 | 2023-03-28 | 广州中基国威电子科技有限公司 | Heating protection circuit, heating device and protection method |
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| CN1991654A (en) * | 2005-12-31 | 2007-07-04 | 博奥生物有限公司 | Temperature sensor needless accurate heating-up temperature control device and method |
| CN101893904A (en) * | 2010-07-16 | 2010-11-24 | 韩燕� | Temperature control device and method of electric heating body |
| CN201876747U (en) * | 2010-12-09 | 2011-06-22 | 海南清华显示器科技开发有限公司 | Temperature-control heater |
| CN207150147U (en) * | 2017-06-21 | 2018-03-27 | 深圳Tcl新技术有限公司 | Overvoltage crowbar and switching power supply |
| CN108092498A (en) * | 2018-02-05 | 2018-05-29 | 珠海格力电器股份有限公司 | Over-temperature protection device, method and Switching Power Supply |
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2018
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1991654A (en) * | 2005-12-31 | 2007-07-04 | 博奥生物有限公司 | Temperature sensor needless accurate heating-up temperature control device and method |
| CN101893904A (en) * | 2010-07-16 | 2010-11-24 | 韩燕� | Temperature control device and method of electric heating body |
| CN201876747U (en) * | 2010-12-09 | 2011-06-22 | 海南清华显示器科技开发有限公司 | Temperature-control heater |
| CN207150147U (en) * | 2017-06-21 | 2018-03-27 | 深圳Tcl新技术有限公司 | Overvoltage crowbar and switching power supply |
| CN108092498A (en) * | 2018-02-05 | 2018-05-29 | 珠海格力电器股份有限公司 | Over-temperature protection device, method and Switching Power Supply |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109998182A (en) * | 2019-05-28 | 2019-07-12 | 珠海市香之君科技股份有限公司 | A kind of heating means of electronic cigarette |
| CN113950867A (en) * | 2019-05-29 | 2022-01-18 | 捷温有限责任公司 | Device for determining the temperature of a resistance heating device |
| CN115250549A (en) * | 2022-09-22 | 2022-10-28 | 广州中基国威电子科技有限公司 | Heating control method, heating control circuit and heating device |
| CN115250549B (en) * | 2022-09-22 | 2022-12-13 | 广州中基国威电子科技有限公司 | Heating control method, heating control circuit and heating device |
| CN115864302A (en) * | 2023-02-06 | 2023-03-28 | 广州中基国威电子科技有限公司 | Heating protection circuit, heating device and protection method |
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Application publication date: 20190222 |
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