CN117191210A - Non-intervention type temperature measuring circuit for power equipment - Google Patents
Non-intervention type temperature measuring circuit for power equipment Download PDFInfo
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- CN117191210A CN117191210A CN202311294556.1A CN202311294556A CN117191210A CN 117191210 A CN117191210 A CN 117191210A CN 202311294556 A CN202311294556 A CN 202311294556A CN 117191210 A CN117191210 A CN 117191210A
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- 238000009529 body temperature measurement Methods 0.000 claims abstract description 29
- 238000012544 monitoring process Methods 0.000 claims abstract description 12
- 238000004891 communication Methods 0.000 claims abstract description 11
- 230000008859 change Effects 0.000 claims abstract description 5
- 239000003985 ceramic capacitor Substances 0.000 claims description 53
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 20
- 229910052697 platinum Inorganic materials 0.000 claims description 10
- 230000006698 induction Effects 0.000 claims description 9
- 230000003993 interaction Effects 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 230000000087 stabilizing effect Effects 0.000 claims description 5
- 230000002457 bidirectional effect Effects 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 claims description 3
- 230000001629 suppression Effects 0.000 claims description 3
- 230000001052 transient effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Arrangements For Transmission Of Measured Signals (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention relates to the technical field of temperature measuring circuits, in particular to a non-intrusive temperature measuring circuit of electric equipment, which comprises a temperature measuring sensor, wherein the temperature measuring sensor comprises a wireless power taking module, a high-precision temperature measuring module, a 433MHz communication module and an MCU control module, and the wireless power taking module is used for high-voltage passive power taking of the temperature measuring sensor; the high-precision temperature measurement module is used for realizing real-time monitoring of the temperature change of the cable where the temperature measurement sensor is located, changing the sensor temperature monitoring mode, adopting contact type temperature measurement and solving the limitation that the sensor can only be used in indoor environment.
Description
Technical Field
The invention relates to the technical field of temperature measuring circuits, in particular to a non-invasive temperature measuring circuit of power equipment.
Background
The non-contact infrared temperature monitoring device is mainly used for monitoring the temperature of the high-voltage line, the device can only be installed indoors, the infrared monitoring mode is used outdoors, ultraviolet interference in sunlight is easily received, the measurement result is inaccurate, the optical sensor head is installed indoors or outdoors, the optical signal is blocked due to long-time exposure to the environment, dust aggregation and the like, the optical sensor head cannot be normally used, regular arrangement and maintenance are needed, and the later operation and maintenance cost is high. The contact temperature monitoring is carried out by adopting a thermistor and a matching resistor to divide the voltage, and converting the voltage of the thermistor to the ground into a temperature value.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the invention provides a non-invasive temperature measuring circuit of power equipment.
(II) technical scheme
In order to achieve the above purpose, the present invention provides the following technical solutions: the non-intervention type temperature measuring circuit of the power equipment comprises a temperature measuring sensor, wherein the temperature measuring sensor comprises a wireless power taking module, a high-precision temperature measuring module, a 433MHz communication module and an MCU control module, and the wireless power taking module is used for high-voltage passive power taking of the temperature measuring sensor;
the high-precision temperature measurement module is used for realizing real-time monitoring of the temperature change of the cable where the temperature measurement sensor is located;
the 433MHz communication module is used for realizing transparent transmission of real-time monitoring data of the temperature sensor;
the MCU control module is used for realizing the data interaction and the data conversion and control functions of each distribution module.
In order to conveniently obtain high-voltage energy on a line through wireless induction and convert and store the high-voltage energy into stable voltage required by a system, the invention is improved in that the wireless power-taking module comprises a voltage induction coil X1, a rectifier bridge BR1 and a low-power-consumption voltage stabilizing chip U1, the rectifier bridge BR1 is electrically connected with the voltage induction coil X1, the voltage induction coil X1 is connected with a piezoresistor R1, a nonpolar ceramic capacitor C1 and a bidirectional transient suppression diode D1 in parallel, the rectifier bridge BR1 is connected with a nonpolar ceramic capacitor C2, a nonpolar ceramic capacitor C3, a nonpolar ceramic capacitor C5, a nonpolar ceramic capacitor C6, a nonpolar ceramic capacitor C4 and a nonpolar ceramic capacitor C7 in sequence, and the low-power-consumption voltage stabilizing chip U1 is arranged between the nonpolar ceramic capacitor C6 and the nonpolar ceramic capacitor C4.
In order to facilitate the corresponding resistance value of the temperature on the high-voltage line received by the platinum thermal resistor PT1000, after the small signal is amplified by the signal amplifier, the analog voltage signal is converted into the digital signal to be sent to the MCU for table lookup comparison and corresponding fitting calculation, and the corresponding temperature value is obtained.
In order to provide stable voltage for the circuit, the invention improves the built-in filter capacitor of the signal amplifier.
In order to facilitate the transparent transmission of real-time monitoring data of a temperature sensor, the invention is improved in that the 433MHz communication module comprises a 433MHz wireless transmitting chip U2, a ceramic capacitor C14, a ceramic capacitor C15, a ceramic capacitor C8 and a ceramic capacitor C9, wherein the ceramic capacitor C14 is connected with the ceramic capacitor C15 in parallel and is electrically connected with a 433MHz wireless transmitting chip U2 interface, and the ceramic capacitor C8 and the ceramic capacitor C9 are electrically connected with the 433MHz wireless transmitting chip U2 interface.
In order to form an antenna matching circuit conveniently for adjusting the impedance matching of the antenna, the module and the PCB wiring so as to achieve the optimal signal effect, the invention is improved in that a chip resistor R3 is arranged between the ceramic capacitor C8 and the ceramic capacitor C9.
In order to facilitate the enhancement of wireless signals when data is transmitted from outside, the invention is improved in that a spring antenna E1 is arranged between the ceramic capacitor C8 and the ceramic capacitor C9.
In order to facilitate control of temperature parameters of the acquisition cable and realize data conversion and data interaction with a data concentrator, the invention is improved in that the MCU control module comprises a main control MCUU6, a chip resistor R15, a chip resistor R16 and a ceramic capacitor C19, wherein the main control MCUU6 is respectively and electrically connected with an accurate ADC chip U4 and a 433MHz wireless transmitting chip U2, the chip resistor R16 is respectively and serially connected with the chip resistor R15 and the ceramic capacitor C19, and the chip resistor R15, the chip resistor R16 and the ceramic capacitor C19 are respectively and electrically connected with different interfaces of the main control MCUU 6.
In order to facilitate decoupling and prevent current fluctuation formed in a power supply circuit from influencing the normal operation of the circuit when the current of the front circuit and the back circuit change, the invention is improved in that a ceramic capacitor C18 is arranged in the MCU control module.
(III) beneficial effects
Compared with the prior art, the invention provides a non-invasive temperature measuring circuit of power equipment, which has the following beneficial effects:
the non-intrusive temperature measuring circuit of the power equipment,
1. the temperature monitoring mode of the sensor is changed, and the limitation that the sensor can only be used in indoor environment is solved by adopting contact type temperature measurement;
2. the temperature measuring mode of the temperature measuring circuit is changed, the original voltage partial pressure acquisition mode is changed into a constant current differential mode acquisition mode, the measurement consistency among the sensors is improved, the temperature acquisition precision is improved, and the precision problem caused by the differences of components and the like is reduced.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a schematic diagram of a wireless power module according to the present invention;
FIG. 3 is a schematic diagram of a high-precision temperature measurement module according to the present invention;
FIG. 4 is a schematic diagram of 433MHz communication module in accordance with the present invention;
FIG. 5 is a schematic diagram of the MCU control module according to the present invention;
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-5, a non-invasive temperature measurement circuit of a power device includes a temperature measurement sensor, wherein the temperature measurement sensor can be installed on an indoor or outdoor high-voltage line, and is composed of a wireless power supply module, a high-precision temperature measurement module, a 433MHz communication module and an MCU control module, and the wireless power taking module obtains high-voltage energy on the line through wireless induction, and converts and stores the high-voltage energy into stable voltage required by the system. X1 is a voltage induction coil that generates an alternating induced voltage on the high voltage line. R1 is a piezoresistor, D1 is a bidirectional transient suppression diode, C1 is a nonpolar ceramic capacitor, and the three functions of protecting a circuit, limiting the induced AC type to about 14V, and protecting surge impact on a circuit. BR1 is a rectifier bridge that converts the front-end alternating current AC to direct current DC. The functions of C2, C3, C5, C6, C4 and C7 are energy storage filtering, so that the stability of output voltage is improved. U1 is a low-power-consumption voltage stabilizing chip, and provides stable 3.3V voltage for a later-stage circuit under the condition of low loss.
The high-precision temperature measurement module amplifies a small signal through an operational amplifier according to a resistance value corresponding to the temperature of a high-voltage line to which the platinum thermal resistor PT1000 is subjected, converts an analog voltage signal into a digital signal through a 16-bit high-precision ADC (analog to digital converter), and performs table lookup comparison and corresponding fitting calculation on the digital signal to obtain a corresponding temperature value. U5 is a current sensing amplifier, the current on the circuit can be constant at a set value, after R12 is connected, 0.3mA constant current is arranged on the circuit, R10 is a platinum thermal resistor PT1000, when the temperature changes, the resistance changes along with the platinum thermal resistor PT1000, the voltage values at two ends of R10 can be obtained because of the constant loop current, small signals at two ends of the platinum thermal resistor PT1000 are amplified through an amplifier formed by U3, R2, R4, R6, R7 and R8, the high-precision ADC chip of the rear stage U4 is acquired and converted into digital signals, U4 is connected with a main control MCU serial port through I2C interfaces U4-9 and U4-10, interaction among data is realized, and the main control MCU can judge the current working state through U4-2 pin level. R5 serves as a voltage divider for the measurement loop and provides a reference voltage. And C10, C11, C12, C13, C16 and C17 are filter capacitors and serve to provide stable voltage for a subsequent chip. (because the measuring loop is constant current, the voltage at two ends of R10 is only affected by temperature, and the difference between the actual power supply voltage and the calculated voltage and the influence of factors such as matching resistance precision errors are avoided in a relative partial pressure sampling mode).
The 433MHz communication module is used for solving interaction between the sensor and the cable temperature monitoring data and the data concentrator. U2 is 433MHz wireless emission chip, links to each other with main control MCU serial ports through serial ports interface U2-5, realizes the interaction between the data, and main control MCU accessible sets up the level of U2-3, U2-7 foot makes the chip enter different working modes, and no data transmission makes, can set up the chip into low-power consumption mode to reduce the complete machine system consumption. C14 and C15 are ceramic capacitors, which have the function of filtering and preventing the current fluctuation formed in the power supply circuit from influencing the normal operation of the circuit when the current of the front circuit and the back circuit change. C8 and C9 are ceramic capacitors, R3 is a chip resistor, and the chip resistor forms an antenna matching circuit for adjusting impedance matching of an antenna, a module and a PCB wire so as to achieve the best signal effect. E1 is a spring antenna for externally transmitting data as an enhanced wireless signal.
The MCU control module is used for controlling the temperature parameters of the acquisition cable and realizing the functions of data conversion and data interaction with the data concentrator. U6 is the main control MCU, and C18 is ceramic capacitor, and it plays the decoupling effect, can prevent that the current fluctuation that forms in power supply circuit from producing the influence to the normal work of circuit when circuit current size changes around. R15 and R16 are chip resistors, and C19 is a ceramic capacitor which forms a reset circuit of the MCU to provide conditions for the normal operation of the MCU.
In summary, when the non-invasive temperature measurement circuit of the power equipment is used, an operator amplifies a small signal through an operational amplifier by using a resistance value corresponding to the temperature on a high-voltage line to which the platinum thermal resistor PT1000 is subjected through the high-precision temperature measurement module, converts an analog voltage signal into a digital signal through the 16-bit high-precision ADC to carry out table lookup comparison and corresponding fitting calculation on the digital signal, obtains a corresponding temperature value, then controls the temperature parameter of a collection cable through the MCU control module, realizes data conversion and data interaction with the data concentrator, and then controls the spring antenna E1 of the 433MHz communication module to carry out data transmission on the operator.
The electrical components are all connected with an external main controller and 220V mains supply, and the main controller can be conventional known equipment for controlling a computer and the like.
In the description herein, it should be noted that the terms "coupled," "connected," and "connected," should be construed broadly, and may be either permanently connected, detachably connected, or integrally connected, for example, unless otherwise specifically indicated and defined; the connection may be mechanical connection, electrical connection, direct connection, or indirect connection via an intermediary. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In this description, it should be noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The utility model provides a non-intervention formula temperature measurement circuit of power equipment, includes temperature sensor, its characterized in that: the temperature measurement sensor comprises a wireless power taking module, a high-precision temperature measurement module, a 433MHz communication module and an MCU control module, wherein the wireless power taking module is used for high-voltage passive power taking of the temperature measurement sensor;
the high-precision temperature measurement module is used for realizing real-time monitoring of the temperature change of the cable where the temperature measurement sensor is located;
the 433MHz communication module is used for realizing transparent transmission of real-time monitoring data of the temperature sensor;
the MCU control module is used for realizing the data interaction and the data conversion and control functions of each distribution module.
2. The electrical equipment non-invasive temperature measurement circuit according to claim 1, wherein: the wireless power taking module comprises a voltage induction coil X1, a rectifier bridge BR1 and a low-power-consumption voltage stabilizing chip U1, wherein the rectifier bridge BR1 is electrically connected with the voltage induction coil X1, the voltage induction coil X1 is connected with a piezoresistor R1, a nonpolar ceramic capacitor C1 and a bidirectional transient suppression diode D1 in parallel, the rectifier bridge BR1 is sequentially connected with the nonpolar ceramic capacitor C2, the nonpolar ceramic capacitor C3, the nonpolar ceramic capacitor C5, the nonpolar ceramic capacitor C6, the nonpolar ceramic capacitor C4 and the nonpolar ceramic capacitor C7 in parallel, and the low-power-consumption voltage stabilizing chip U1 is arranged between the nonpolar ceramic capacitor C6 and the nonpolar ceramic capacitor C4.
3. The electrical equipment non-invasive temperature measurement circuit according to claim 2, wherein: the high-precision temperature measurement module comprises a current sense amplifier U5, a high-precision ADC chip U4, a platinum thermal resistor PT1000 and a signal amplifier, wherein the current sense amplifier U5 is connected with the platinum thermal resistor PT1000 in series, the high-precision ADC chip U4 is connected with the platinum thermal resistor PT1000 in parallel, and the signal amplifier is arranged between the high-precision ADC chip U4 and the platinum thermal resistor PT 1000.
4. A non-invasive temperature measurement circuit for electrical equipment according to claim 3, wherein: the signal amplifier is internally provided with a filter capacitor.
5. The non-invasive temperature measurement circuit of electrical equipment of claim 4, wherein: the 433MHz communication module comprises a 433MHz wireless transmitting chip U2, a ceramic capacitor C14, a ceramic capacitor C15, a ceramic capacitor C8 and a ceramic capacitor C9, wherein the ceramic capacitor C14 is connected with the ceramic capacitor C15 in parallel and is electrically connected with a 433MHz wireless transmitting chip U2 interface, and the ceramic capacitor C8 and the ceramic capacitor C9 are electrically connected with the 433MHz wireless transmitting chip U2 interface.
6. The electrical equipment non-invasive temperature measurement circuit according to claim 5, wherein: and a chip resistor R3 is arranged between the ceramic capacitors C8 and C9.
7. The electrical equipment non-invasive temperature measurement circuit of claim 6, wherein: and a spring antenna E1 is arranged between the ceramic capacitors C8 and C9.
8. The electrical equipment non-invasive temperature measurement circuit of claim 7, wherein: the MCU control module comprises a main control MCUU6, a chip resistor R15, a chip resistor R16 and a ceramic capacitor C19, wherein the main control MCUU6 is electrically connected with an accuracy ADC chip U4 and a 433MHz wireless transmitting chip U2 respectively, the chip resistor R16 is connected with the chip resistor R15 and the ceramic capacitor C19 in series, and the chip resistor R15, the chip resistor R16 and the ceramic capacitor C19 are electrically connected with different interfaces of the main control MCUU6 respectively.
9. The electrical equipment non-invasive temperature measurement circuit of claim 8, wherein: and a ceramic capacitor C18 is arranged in the MCU control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311294556.1A CN117191210A (en) | 2023-10-09 | 2023-10-09 | Non-intervention type temperature measuring circuit for power equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311294556.1A CN117191210A (en) | 2023-10-09 | 2023-10-09 | Non-intervention type temperature measuring circuit for power equipment |
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| Publication Number | Publication Date |
|---|---|
| CN117191210A true CN117191210A (en) | 2023-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311294556.1A Pending CN117191210A (en) | 2023-10-09 | 2023-10-09 | Non-intervention type temperature measuring circuit for power equipment |
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|---|---|
| CN (1) | CN117191210A (en) |
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- 2023-10-09 CN CN202311294556.1A patent/CN117191210A/en active Pending
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