CN218997682U - Temperature protection circuit for constant-temperature wax therapy instrument - Google Patents
Temperature protection circuit for constant-temperature wax therapy instrument Download PDFInfo
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- CN218997682U CN218997682U CN202222864697.XU CN202222864697U CN218997682U CN 218997682 U CN218997682 U CN 218997682U CN 202222864697 U CN202222864697 U CN 202222864697U CN 218997682 U CN218997682 U CN 218997682U
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- heating belt
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- 238000002560 therapeutic procedure Methods 0.000 title claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 45
- 238000005070 sampling Methods 0.000 claims abstract description 20
- 239000007787 solid Substances 0.000 claims description 13
- 238000001514 detection method Methods 0.000 abstract description 15
- 239000001993 wax Substances 0.000 description 20
- 230000002159 abnormal effect Effects 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000012188 paraffin wax Substances 0.000 description 3
- 230000001225 therapeutic effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 208000005392 Spasm Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000008472 epithelial growth Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000008338 local blood flow Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000554 physical therapy Methods 0.000 description 1
- 231100000241 scar Toxicity 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Control Of Temperature (AREA)
Abstract
The utility model relates to a temperature protection circuit for a constant temperature wax therapy instrument, which comprises an MCU chip, a temperature sensor, a driving circuit and a heating belt, wherein the output end of the temperature sensor is connected with the input end of the MCU chip; the heating belt is of a strip-shaped structure, and the temperature sensor and the second temperature sensor are arranged at positions close to the edge of the heating belt along the central line of the heating belt at equal intervals. The second temperature sensor is combined with the sampling circuit to be connected with the MCU chip, so that the reliability of temperature detection is improved.
Description
Technical Field
The utility model relates to the field of wax therapy rehabilitation and thermal therapy equipment, in particular to a temperature protection circuit for a constant-temperature wax therapy instrument.
Background
Wax therapy is a physiotherapy method in which wax is applied to an affected part by heating or the affected part is immersed in wax liquid, and the effect of treating diseases is achieved by utilizing certain mechanical and chemical stimulation of paraffin itself. The paraffin can be used for promoting local blood circulation, promoting epithelial tissue growth, softening and relieving scar, eliminating swelling, relieving adhesion, and relieving pain and spasm. The utility model is widely used in the field of rehabilitation, especially in the field of thermal therapy.
The prior wax therapeutic apparatus is provided with a wax liquid therapeutic groove and a heating belt, and paraffin in the wax liquid therapeutic groove is heated by the heating belt during working. The wax therapy needs to strictly control the heating temperature so as to prevent a user from being burnt, and therefore, the conventional wax therapy instrument is provided with a temperature sensor for detecting the temperature of the heating belt, and a PID algorithm is adopted to control the electrifying time of the heating belt by outputting PWM signals so as to keep the wax liquid at a constant temperature.
Because the heating temperature is embodied through the temperature sensor, the stability of the temperature sensor is quite important, the conventional wax therapy instrument only has one temperature sensor, and the temperature sensor is a thermistor which has small volume due to the structural influence of a heating belt, but in the actual experiment, the temperature sensor is distorted, so that more reliable temperature detection is required, and meanwhile, the host of the wax therapy instrument can be powered off when the temperature sensor is abnormal, so that the user is prevented from being scalded.
Disclosure of Invention
The utility model provides a temperature protection circuit for a constant-temperature wax therapy instrument, which solves the problem that the detection of a temperature detection module of the conventional wax therapy instrument is unreliable, and the temperature detection reliability is improved by arranging a second temperature sensor to be connected with an MCU chip in combination with a sampling circuit.
In order to achieve the above object, the technical scheme of the present utility model is as follows:
the temperature protection circuit comprises an MCU chip, a temperature sensor, a driving circuit and a heating belt, wherein the output end of the temperature sensor is connected with the input end of the MCU chip, the MCU chip is electrically connected with the driving circuit, the heating belt is connected with a power supply through the driving circuit to form a loop, a sampling circuit and a second temperature sensor are arranged between the MCU chip and the temperature sensor, the temperature sensor and the second temperature sensor are both connected with an ADC pin of the MCU chip through the sampling circuit, the driving circuit comprises a solid-state relay, and the driving circuit is electrically connected with a light alarm circuit;
the heating belt is of a strip-shaped structure, and the temperature sensor and the second temperature sensor are equidistantly arranged at positions close to the edge of the heating belt along the central line of the heating belt.
The operation principle is as follows: the MCU chip is an integrated chip, has a comparator function, can be used as a comparator, compares the analog inputs of the temperature sensor and the second temperature sensor, and judges whether the second temperature sensor and the temperature sensor are abnormal or not.
And meanwhile, a second temperature sensor is arranged to provide hardware support for obtaining the detected temperature by adopting an average value taking algorithm.
The second temperature sensor and the sampling circuit are additionally arranged on the basis of the original temperature control circuit, the problem of low detection reliability of the existing temperature detection module is solved, the advantage of small volume of the original temperature sensor is continued, meanwhile, the circuit is simple, and the production cost is low.
Further, the temperature sensor comprises a first NTC resistor, the second temperature sensor comprises a second NTC resistor, the first NTC resistor and the second NTC resistor are respectively connected with sampling circuits, the number of the corresponding sampling circuits is two, and the two sampling circuits comprise a low-pass filter circuit and a current-limiting resistor;
the positive electrode of the first NTC resistor is connected with an ADC pin of the MCU chip through a low-pass filter circuit by a current-limiting resistor, and the negative electrode of the first NTC resistor is grounded through the low-pass filter circuit;
the positive pole of second NTC resistance passes through low pass filter circuit and passes through the ADC pin that current-limiting resistor connected MCU chip, and the negative pole of second NTC resistance passes through pass filter circuit ground connection.
An NTC (negative temperature coefficient) resistor adopts a low-pass filter circuit and a current-limiting resistor to filter and collect an analog voltage signal of the NTC resistor along with temperature change, so that signal interference is reduced, and signal precision is improved.
Further, the driving circuit further comprises a PWM output circuit, the PWM output circuit comprises a triode, a base electrode of the triode is connected with an IO pin of the MCU chip, an emitting electrode of the triode is grounded, and a collecting electrode of the triode is connected with a coil of the solid state relay.
Further, the heating belt is connected with a power supply through a normally closed contact of the solid state relay to form a loop.
The MCU chip outputs PWM signals to control the on-off and the electricity of the coil of the solid state relay through the triode, so that the temperature of the heating belt is stabilized in a temperature range, and the use safety of equipment is improved.
Further, the lamplight alarm circuit comprises a display lamp, and the display lamp is connected with a power supply through a normally closed contact of the solid-state relay to form a loop.
The light alarm circuit is arranged to provide visual equipment state prompt for a user by adopting the light emitting diode, and when the temperature sensor or the second temperature sensor is powered off due to abnormal heating bands, the light emitting diode emits light.
Through the technical scheme, the utility model has the beneficial effects that:
the conventional MCU chip is used as the comparator, the second temperature sensor is arranged, when the temperature sensor or the second temperature sensor is abnormal, the output pin of the MCU chip has no electric signal, so that the driving circuit cannot work, the heating belt is powered off, and the light alarm circuit is powered on to provide light reminding for a user, so that the user is prevented from being scalded;
on the other hand, the temperature detection effect on the heating belt is improved after the second temperature sensor is additionally arranged, the existing temperature sensor is arranged at the position close to the middle of the heating belt and is adjusted to be at the position close to the edge of the heating belt, and the two temperature sensors are prevented from being influenced at the same position at the same time.
Drawings
FIG. 1 is one of the electrical schematic diagrams of a temperature protection circuit for a constant temperature wax therapy instrument of the present utility model;
FIG. 2 is a second electrical schematic diagram of a temperature protection circuit for a constant temperature wax therapy device in accordance with the present utility model;
fig. 3 is a schematic layout diagram of a temperature sensor and a second temperature sensor of a temperature protection circuit for a constant temperature wax therapy apparatus according to the present utility model.
The reference numerals in the drawings are: the temperature sensor comprises an MCU chip 1, a heating belt 2, a solid state relay 3, a first NTC resistor 4, a second NTC resistor 5, a sampling circuit 6, a triode 7 and a display lamp 8.
Detailed Description
The utility model is further described with reference to the drawings and detailed description which follow:
example 1
As shown in fig. 1-3, a temperature protection circuit for a constant temperature wax therapy instrument comprises an MCU chip 1, a temperature sensor, a driving circuit and a heating belt 2, wherein the output end of the temperature sensor is connected with the input end of the MCU chip 1, the MCU chip 1 is electrically connected with the driving circuit, the heating belt 2 is connected with a power supply through the driving circuit to form a loop, a sampling circuit 6 and a second temperature sensor are arranged between the MCU chip 1 and the temperature sensor, the temperature sensor and the second temperature sensor are both connected with an ADC pin of the MCU chip 1 through the sampling circuit 6, the driving circuit comprises a solid state relay 3, and the driving circuit is electrically connected with a lamplight alarm circuit;
the heating belt 2 is of a strip-shaped structure, and the temperature sensor and the second temperature sensor are equidistantly arranged at positions close to the edge of the heating belt 2 along the central line of the heating belt 2.
Preferably, the temperature sensor comprises a first NTC resistor 4, the second temperature sensor comprises a second NTC resistor 5, the first NTC resistor 4 and the second NTC resistor 5 are respectively connected with sampling circuits 6, the number of the corresponding sampling circuits 6 is two, and the two sampling circuits 6 comprise a low-pass filter circuit and a current limiting resistor;
the positive electrode of the first NTC resistor 4 is connected with an ADC pin of the MCU chip 1 through a low-pass filter circuit by a current-limiting resistor, and the negative electrode of the first NTC resistor 4 is grounded through the low-pass filter circuit;
the positive pole of second NTC resistance 5 passes through low pass filter circuit and connects the ADC pin of MCU chip 1 through current-limiting resistor, and the negative pole of second NTC resistance 5 passes through pass filter circuit ground connection.
Preferably, the driving circuit further comprises a PWM output circuit, the PWM output circuit comprises a triode 7, a base electrode of the triode 7 is connected with an IO pin of the MCU chip 1, an emitting electrode of the triode 7 is grounded, and a collecting electrode of the triode 7 is connected with a coil of the solid-state relay 3.
Preferably, the heating belt 2 is connected with a power supply through a normally closed contact of the solid state relay 3 to form a loop.
Preferably, the light alarm circuit comprises a display lamp 8, and the display lamp 8 is connected with a power supply through a normally closed contact of the solid-state relay 3 to form a loop.
In this embodiment, the MCU chip 1 is an STM 32-type singlechip, the triode 7 is an NPN-type triode model SS8050, and the heating belt 2 includes carbon fiber heating wires arranged in a straight line at equal intervals.
Temperature detection and temperature protection are described in connection with the above embodiments:
the temperature detection, MCU chip is on, drive circuit work, the normally open contact of solid state relay 3 is closed, normally closed contact disconnection, heating band 2 circular telegram generates heat, along with the temperature variation of heating band 2, according to thermistor characteristic, the resistance of first NTC resistance 4 and second NTC resistance 5 can change along with the temperature variation of heating band 2, first NTC resistance 4 and second NTC resistance 5 all are provided with low pass filter circuit and current limiting resistor, accomplish analog signal's transmission through low pass filter circuit and current limiting resistor, MCU chip 1 is with analog signal conversion digital signal obtain the temperature parameter of heating band 2.
The temperature protection is achieved, the setting positions of the temperature sensor and the second temperature sensor are different, meanwhile, the fault probability of the temperature sensor is extremely low, when the input values of the first NTC resistor 4 and the second NTC resistor 5 are greatly different, the MCU chip 1 is used as a comparator, the triode 7 is cut off by the MCU chip 1, at the moment, the coil of the solid state relay 3 is powered off, the normally open contact is reset, the normally closed contact is reset, the display lamp 8 is connected with a power supply through the normally closed contact of the solid state relay 3, and the display lamp 8 emits light to remind a user.
Example 2
The temperature detection and temperature protection in example 1 were optimized in this example using a computer program based on example 1:
and after the detection data of the temperature sensor and the second temperature sensor are obtained, the mathematical average value of the detection data is taken as a temperature feedback signal, so that the detection accuracy and smoothness are improved, and the detection interference is reduced.
And the temperature protection is carried out by adopting a PID control algorithm, and a temperature feedback signal obtained through a mean value sampling algorithm is used as a feedback signal of PID control, so that the heating belt 2 works at a constant temperature, a user is protected, and when the temperature feedback signal is abnormal, the MCU chip 1 controls the heating belt 2 to be powered off.
The above-described embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model, so that all equivalent changes or modifications of the structure, characteristics and principles described in the claims should be included in the scope of the present utility model.
Claims (5)
1. The temperature protection circuit for the constant temperature wax therapy instrument comprises an MCU chip (1), a temperature sensor, a driving circuit and a heating belt (2), wherein the output end of the temperature sensor is connected with the input end of the MCU chip (1), the MCU chip (1) is electrically connected with the driving circuit, and the heating belt (2) is connected with a power supply through the driving circuit to form a loop, the temperature protection circuit is characterized in that a sampling circuit (6) and a second temperature sensor are arranged between the MCU chip (1) and the temperature sensor, the temperature sensor and the second temperature sensor are both connected with an ADC pin of the MCU chip (1) through the sampling circuit (6), and the driving circuit comprises a solid state relay (3) which is electrically connected with a lamplight alarm circuit;
the heating belt (2) is of a strip-shaped structure, and the temperature sensor and the second temperature sensor are equidistantly arranged at positions close to the edge of the heating belt (2) along the central line of the heating belt (2).
2. A temperature protection circuit for a constant temperature wax therapy instrument according to claim 1, wherein the temperature sensor comprises a first NTC resistor (4), the second temperature sensor comprises a second NTC resistor (5), the first NTC resistor (4) and the second NTC resistor (5) are respectively connected with sampling circuits (6), the number of the corresponding sampling circuits (6) is two, and the two sampling circuits (6) comprise a low-pass filter circuit and a current limiting resistor;
the positive electrode of the first NTC resistor (4) is connected with an ADC pin of the MCU chip (1) through a low-pass filter circuit by a current-limiting resistor, and the negative electrode of the first NTC resistor (4) is grounded through the low-pass filter circuit;
the positive pole of second NTC resistance (5) passes through low pass filter circuit and connects the ADC pin of MCU chip (1) through current-limiting resistor, and the negative pole of second NTC resistance (5) is through the ground connection of pass filter circuit.
3. The temperature protection circuit for the constant temperature wax therapy instrument according to claim 1, wherein the driving circuit further comprises a PWM output circuit, the PWM output circuit comprises a triode (7), a base electrode of the triode (7) is connected with an IO pin of the MCU chip (1), an emitter electrode of the triode (7) is grounded, and a collector electrode of the triode (7) is connected with a coil of the solid state relay (3).
4. A temperature protection circuit for a constant temperature wax therapy instrument according to claim 3, characterized in that the heating belt (2) is connected with a power supply through a normally closed contact of a solid state relay (3) to form a loop.
5. A temperature protection circuit for a constant temperature wax therapy instrument according to claim 1, characterized in that the light alarm circuit comprises a display lamp (8), the display lamp (8) is connected with a power supply through a normally closed contact of a solid state relay (3) to form a loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222864697.XU CN218997682U (en) | 2022-10-29 | 2022-10-29 | Temperature protection circuit for constant-temperature wax therapy instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222864697.XU CN218997682U (en) | 2022-10-29 | 2022-10-29 | Temperature protection circuit for constant-temperature wax therapy instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218997682U true CN218997682U (en) | 2023-05-09 |
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ID=86224329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222864697.XU Active CN218997682U (en) | 2022-10-29 | 2022-10-29 | Temperature protection circuit for constant-temperature wax therapy instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218997682U (en) |
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2022
- 2022-10-29 CN CN202222864697.XU patent/CN218997682U/en active Active
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