CN109813437A - Passive and wireless infrared temperature measurement apparatus - Google Patents
Passive and wireless infrared temperature measurement apparatus Download PDFInfo
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 80
- 238000012545 processing Methods 0.000 claims abstract description 46
- 230000005611 electricity Effects 0.000 claims abstract description 12
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- 239000002390 adhesive tape Substances 0.000 claims description 16
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- 230000005540 biological transmission Effects 0.000 claims description 10
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 claims description 6
- 238000000137 annealing Methods 0.000 claims description 6
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- 239000004065 semiconductor Substances 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 10
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Abstract
The invention discloses a kind of passive and wireless infrared temperature measurement apparatus, and the present invention obtains electric energy by electricity taking coil, and provides first voltage for power conversion module；Power conversion module is that infrared sensor module, analog-to-digital conversion module and wireless processing module are powered after first voltage is converted to second voltage；Infrared sensor module realizes that temperature measures and temperature analog signal is sent to analog-to-digital conversion module；Temperature analog signal is converted into temperature digital signal and is sent to wireless processing module by analog-to-digital conversion module；Temperature digital signal is wirelessly transferred by wireless processing module, is realized by passive wireless technologies in conjunction with infrared temperature-test technology, and takes into account feature small in size and low in energy consumption, and high precision measuring temperature can be realized under lower starting current.
Description
Technical Field
The invention relates to the field of temperature measurement sensing, in particular to a passive wireless infrared temperature measuring device.
Background
The temperature measurement products of the switch cabinet are developed for many years, and the active power supply mode of the battery power supply at the beginning is generally changed into the passive power supply mode, and most of the products in the market have large volume and high power consumption; the infrared temperature measurement products are mostly handheld, and the products can not be unattended and have higher requirements on operators.
The existing passive wireless temperature measurement products in the market at present cannot support the infrared temperature measurement function, and due to the size, the problem of installation space is inevitably required to be considered when the switch cabinet is installed, so that certain switch cabinets with too narrow space cannot use the more portable product; although the existing infrared temperature measurement products on the market are not limited by the size due to the use of a contactless technology, the infrared temperature measurement products cannot be applied to a passive wireless power supply module due to the limitations of high power consumption and a temperature measurement principle, unattended real-time measurement cannot be achieved, in addition, infrared light beams must be used for irradiation of the handheld infrared temperature measurement products during working, the enterprise idea of low power consumption development is not met due to high self power consumption, and measurement errors can be artificially increased in the irradiation process.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a passive wireless infrared temperature measuring device, and aims to solve the technical problems that a passive wireless temperature measuring product cannot support an infrared temperature measuring function and is high in power consumption in the prior art.
In order to achieve the purpose, the invention provides a passive wireless infrared temperature measuring device which comprises a power-taking coil, a power supply conversion module, an infrared sensing module, an analog-to-digital conversion module and a wireless processing module; the power taking coil is connected with the power supply conversion module, the power supply conversion module is respectively connected with the infrared sensing module, the analog-to-digital conversion module and the wireless processing module, the infrared sensing module is connected with the analog-to-digital conversion module, and the analog-to-digital conversion module is connected with the wireless processing module; wherein,
the power taking coil is used for obtaining electric energy and providing a first voltage for the power supply conversion module;
the power supply conversion module is used for converting the first voltage into a second voltage and then supplying power to the infrared sensing module, the analog-to-digital conversion module and the wireless processing module;
the infrared sensing module is used for realizing temperature measurement and sending a temperature analog signal to the analog-to-digital conversion module;
the analog-to-digital conversion module is used for converting the temperature analog signal into a temperature digital signal and sending the temperature digital signal to the wireless processing module;
and the wireless processing module is used for wirelessly transmitting the temperature digital signal.
Preferably, the wireless processing module is further configured to control the transmission frequency according to a temperature difference between the current temperature digital signal and the previous temperature digital signal.
Preferably, the wireless processing module is further configured to reduce the transmission frequency when the temperature difference is smaller than a preset threshold.
Preferably, the power conversion module includes a power management chip, and a leakage current of the power management chip is less than 10 uA.
Preferably, the power conversion module further includes a linear voltage regulator, a first capacitor, a second capacitor, a third capacitor, and an MOS transistor; wherein,
the input end of the linear voltage stabilizer is connected with the first end of the power taking coil, the output end of the linear voltage stabilizer is connected with the voltage input end of the power management chip, the output end of the linear voltage stabilizer is further connected with the infrared sensing module, the analog-to-digital conversion module and the wireless processing module respectively, and the grounding end of the linear voltage stabilizer is connected with an analog ground;
after the first capacitor, the second capacitor and the third capacitor are connected in parallel, a first end is connected with the output end of the linear voltage stabilizer, and after the first capacitor, the second capacitor and the third capacitor are connected in parallel, a second end is connected with an analog ground;
the grid electrode of the MOS tube is connected with the control end of the power management chip, the source electrode of the MOS tube is connected with the analog ground, and the drain electrode of the MOS tube is connected with the reference ground.
Preferably, the power conversion module further includes a voltage doubling unit, and the voltage doubling unit is connected to the power taking coil and the linear regulator, respectively, and is configured to boost and rectify the first voltage to obtain the second voltage.
Preferably, the voltage doubling unit includes a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, and a ninth capacitor; wherein,
the first diode, the second diode, the third diode, the fourth diode, the fifth diode and the sixth diode are connected in series, the cathode of the first diode is connected with the second end of the power taking coil, and the anode of the sixth diode is connected with the input end of the linear voltage stabilizer;
the first end of the fourth capacitor is connected with the first end of the power taking coil, and the second end of the fourth capacitor is connected with the anode of the first diode;
a first end of the fifth capacitor is connected with a second end of the power taking coil, and a second end of the fifth capacitor is connected with an anode of the second diode;
the first end of the sixth capacitor is connected with the first end of the electricity taking coil, and the second end of the sixth capacitor is connected with the anode of the third diode;
a first end of the seventh capacitor is connected with a second end of the power taking coil, and a second end of the seventh capacitor is connected with an anode of the fourth diode;
a first end of the eighth capacitor is connected with a first end of the power taking coil, and a second end of the eighth capacitor is connected with an anode of the fifth diode;
and the first end of the ninth capacitor is connected with the second end of the electricity taking coil, and the second end of the ninth capacitor is connected with the anode of the sixth diode.
Preferably, the material of the electricity taking coil is iron-nickel alloy subjected to annealing treatment.
Preferably, the passive wireless infrared temperature measuring device further comprises a shell, and a first adhesive tape and a second adhesive tape which are arranged on two sides of the shell, wherein the power conversion module, the infrared sensing module, the analog-to-digital conversion module and the wireless processing module are integrally installed in the shell, and the power taking coil is installed in the first adhesive tape.
Preferably, the second adhesive tape is provided with at least one electricity taking groove.
According to the invention, electric energy is obtained through the power taking coil, and a first voltage is provided for the power supply conversion module; the power supply conversion module converts the voltage into a second voltage and then supplies power to the infrared sensing module, the analog-to-digital conversion module and the wireless processing module; the infrared sensing module realizes temperature measurement and sends a temperature analog signal to the analog-to-digital conversion module; the analog-to-digital conversion module converts the temperature analog signal into a temperature digital signal and sends the temperature digital signal to the wireless processing module; the wireless processing module wirelessly transmits the temperature digital signals, realizes the combination of a passive wireless technology and an infrared temperature measurement technology, has the characteristics of small volume and low power consumption, and can realize high-precision temperature measurement under lower starting current.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a functional block diagram of a first embodiment of a passive wireless infrared temperature measuring device according to the present invention;
FIG. 2 is a schematic structural diagram of a power conversion module in a first embodiment of a passive wireless infrared temperature measurement device according to the present invention;
fig. 3 is a schematic structural diagram of a passive wireless infrared temperature measuring device according to a second embodiment of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| CT | Electricity-taking coil | 40 | Electricity taking groove |
| 100 | Power supply conversion module | 50 | Infrared probe |
| 200 | Infrared sensing module | TS | Linear voltage stabilizer |
| 300 | Analog-to-digital conversion module | D1～D6 | First to sixth diodes |
| 400 | Wireless processing module | C1～C9 | First to ninth capacitors |
| 110 | Voltage doubling unit | Q1 | MOS tube |
| 10 | Shell body | U1 | Power management chip |
| 20 | First adhesive tape | AGND | Simulated ground |
| 30 | Second adhesive tape | GND | Reference ground |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a passive wireless infrared temperature measuring device, referring to fig. 1, in a first embodiment, the passive wireless infrared temperature measuring device comprises a power-taking coil CT, a power conversion module 100, an infrared sensing module 200, an analog-to-digital conversion module 300 and a wireless processing module 400; the power-taking coil CT is connected with the power conversion module 100, the power conversion module 100 is respectively connected with the infrared sensing module 200, the analog-to-digital conversion module 300 and the wireless processing module 400, the infrared sensing module 200 is connected with the analog-to-digital conversion module 300, and the analog-to-digital conversion module 300 is connected with the wireless processing module 400; the power taking coil CT is configured to obtain electric energy and provide a first voltage to the power conversion module 100; the power conversion module 100 is configured to convert the first voltage into a second voltage and then supply power to the infrared sensing module 200, the analog-to-digital conversion module 300, and the wireless processing module 400; the infrared sensing module 200 is configured to implement temperature measurement and send a temperature analog signal to the analog-to-digital conversion module 300; the analog-to-digital conversion module 300 is configured to convert the temperature analog signal into a temperature digital signal and send the temperature digital signal to the wireless processing module 400; the wireless processing module 400 is configured to perform wireless transmission on the temperature digital signal.
It should be noted that the passive technology can make the measuring device have the characteristics of long service life and maintenance-free in the high-voltage electrical temperature measurement scene; compared with contact type temperature measurement, the infrared temperature measurement technology has the characteristics of high sensitivity and high accuracy. The passive wireless infrared temperature measuring device provided by the embodiment of the invention extracts electric energy for the device by using the power-taking coil CT to take power, and gets rid of a short plate powered by a battery, wherein the power-taking coil CT is made of iron-nickel alloy subjected to annealing treatment, so that the device has stronger power-taking capability at a lower starting current (such as 5A), and the device does not generate large temperature rise along with the increase of current; the infrared probe 50 in the infrared sensing module 200 replaces a conventionally used digital temperature sensing chip, so that the temperature measurement accuracy is improved.
It should be understood that the iron-nickel alloy is an alloy with higher magnetic permeability under a weaker magnetic field, has high magnetic permeability and extremely low coercive force and loss value, releases stress after annealing treatment, has stronger ductility and toughness and enhanced magnetic permeability, and thus improves the energy conversion efficiency of the device.
The annealing treatment of the iron-nickel alloy can be carried out in a protective atmosphere (usually with hydrogen) or in vacuum to prevent oxidation and to remove impurities: the vacuum degree should generally be not less than 1.33 Pa. In order to obtain the best stress relief and obtain better magnetic performance, the annealing temperature of the iron-nickel alloy is 1100-1200 ℃.
Further, the wireless processing module 400 is further configured to control the transmission frequency according to a temperature difference between the current temperature digital signal and the previous temperature digital signal.
It should be noted that, the passive wireless infrared temperature measuring device collects temperature at a fixed frequency through the infrared sensing module 200, and the wireless processing module 400 can receive and transmit a temperature signal through an antenna. In a specific implementation, however, the wireless processing module 400 does not need to transmit all the acquired temperature signals, and the transmission frequency may be reduced appropriately in order to reduce the power consumption of the device.
Further, the wireless processing module 400 is further configured to reduce the transmission frequency when the temperature difference is smaller than a preset threshold.
Specifically, the preset threshold may be determined according to the temperature measurement environment, the temperature measurement requirement, and experience, when the temperature difference value received by the wireless processing module 400 is smaller than the preset threshold, the transmission frequency is reduced or not transmitted, and when the temperature value is higher than the preset threshold, the transmission frequency is enhanced. Therefore, the device only needs to transmit data to be measured, more time is in a dormant state, and the power consumption of the device is effectively reduced.
Further, the power conversion module 100 includes a power management chip U1, and the leakage current of the power management chip U1 is less than 10 uA.
It should be noted that, in this embodiment, a device whose leakage current meets the requirement is selected to reduce the consumption of the device itself, for example, a power management chip whose leakage current is less than 10uA is used to reduce the consumption of the power management chip on the current, thereby reducing the power consumption of the entire apparatus.
According to the invention, electric energy is obtained through the power taking coil, and a first voltage is provided for the power supply conversion module; the power supply conversion module converts the voltage into a second voltage and then supplies power to the infrared sensing module, the analog-to-digital conversion module and the wireless processing module; the infrared sensing module realizes temperature measurement and sends a temperature analog signal to the analog-to-digital conversion module; the analog-to-digital conversion module converts the temperature analog signal into a temperature digital signal and sends the temperature digital signal to the wireless processing module; the wireless processing module wirelessly transmits the temperature digital signals, realizes the combination of a passive wireless technology and an infrared temperature measurement technology, and guarantees the characteristic of low power consumption of the device through the technologies of fixed-frequency acquisition-variable-frequency emission, leakage current control and the like.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a power conversion module in a first embodiment of a passive wireless infrared temperature measuring device of the present invention.
In this embodiment, the power conversion module 100 further includes a linear regulator TS, a first capacitor C1, a second capacitor C2, a third capacitor C3, and a MOS transistor Q1; an input end VIN of the linear regulator TS is connected to the first end of the power taking coil CT, an output end VOUT of the linear regulator TS is connected to a voltage input end VDD of the power management chip U1, an output end VOUT of the linear regulator TS is further connected to the infrared sensing module 200, the analog-to-digital conversion module 300, and the wireless processing module 400, respectively, and a ground end of the linear regulator TS is connected to an analog ground AGND; after being connected in parallel, the first capacitor C1, the second capacitor C2 and the third capacitor C3 have a first end connected to an output terminal VOUT of the linear regulator TS, and after being connected in parallel, the first capacitor C1, the second capacitor C2 and the third capacitor C3 have a second end connected to an analog ground AGND; the gate of the MOS transistor Q1 is connected to the control terminal DO of the power management chip U1, the source of the MOS transistor Q1 is connected to the analog ground AGND, and the drain of the MOS transistor Q1 is connected to the ground GND.
It should be understood that after the power coil CT is powered, the voltage is stabilized by the linear voltage stabilizer TS, and then filtered by the first capacitor C1, the second capacitor C2 and the third capacitor C3, and then sent to the power management chip U1, the infrared sensing module 200, the analog-to-digital conversion module 300 and the wireless processing module 400 to supply power to each module.
Further, the power conversion module 100 further includes a voltage doubling unit 110, and the voltage doubling unit 110 is connected to the power taking coil CT and the linear regulator TS, respectively, and is configured to boost and rectify the first voltage to obtain the second voltage.
Specifically, the voltage doubling unit 110 includes a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, a sixth diode D6, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, and a ninth capacitor C9; the first diode D1, the second diode D2, the third diode D3, the fourth diode D4, the fifth diode D5 and the sixth diode D6 are connected in series, a cathode of the first diode D1 is connected to the second end of the power-taking coil CT, and an anode of the sixth diode D6 is connected to the input end VIN of the linear regulator TS; a first end of the fourth capacitor C4 is connected with a first end of the power taking coil CT, and a second end of the fourth capacitor C4 is connected with an anode of the first diode D1; a first end of the fifth capacitor C5 is connected to a second end of the power coil CT, and a second end of the fifth capacitor C5 is connected to an anode of the second diode D2; a first end of the sixth capacitor C6 is connected to a first end of the power-taking coil CT, and a second end of the sixth capacitor C6 is connected to an anode of the third diode D3; a first end of the seventh capacitor C7 is connected to the second end of the power coil CT, and a second end of the seventh capacitor C7 is connected to an anode of the fourth diode D4; a first end of the eighth capacitor C8 is connected to a first end of the power coil CT, and a second end of the eighth capacitor C8 is connected to an anode of the fifth diode D5; a first end of the ninth capacitor C9 is connected to the second end of the power coil CT, and a second end of the ninth capacitor C9 is connected to an anode of the sixth diode D6.
It should be noted that, by using the voltage doubling circuit, the voltage obtained by the power taking coil CT can be increased by 6 times, that is, the second voltage can be 6 times as high as the first voltage, so that the passive power taking capability of the device is significantly enhanced.
According to the embodiment, the voltage doubling circuit is used in the power supply conversion module, so that the passive power taking capability of the passive wireless infrared temperature measuring device is greatly improved, the device can be reliably started under the starting current of 5A, and high-precision temperature measurement is realized.
As shown in fig. 3, fig. 3 is a schematic structural diagram of a passive wireless infrared temperature measuring device according to a second embodiment of the present invention.
In this embodiment, the passive wireless infrared temperature measuring device further includes a housing 10, and a first adhesive tape 20 and a second adhesive tape 30 disposed on two sides of the housing, the power conversion module 100, the infrared sensing module 200, the analog-to-digital conversion module 300, and the wireless processing module 400 are integrally mounted in the housing 10, and the power coil CT is mounted in the first adhesive tape 20.
It should be understood that, by integrally installing the power conversion module 100, the infrared sensing module 200, the analog-to-digital conversion module 300 and the wireless processing module 400 in the housing 10, the passive wireless infrared temperature measuring device has a smaller volume, and can not only meet the requirements of a conventional switch cabinet, but also be used on a measured object with space limitation. The power taking coil CT is arranged in the first rubber strip 20, so that the replacement cost of the device is reduced.
It should be noted that the housing 10 is provided with a through hole for placing the infrared probe 50 in the infrared sensing module 200.
Further, the second adhesive tape 30 is provided with at least one electricity extraction groove 50.
It should be understood that flexible adjustment of the position of the power taking coil CT can be realized by arranging a plurality of power taking grooves, so that the passive wireless infrared temperature measuring device can take power more conveniently. In a specific use process, the electricity taking coil CT is placed in any electricity taking groove 50.
This embodiment is through encapsulation power conversion module, infrared sensing module, analog-to-digital conversion module and wireless processing module in the casing, and the electric coil is got in the installation in first adhesive tape, offers a plurality of electricity taking grooves in the second adhesive tape for passive wireless infrared temperature measuring device has not only integrated the advantage of passive wireless power supply technique and infrared temperature measuring technique, has ensured that the consumption of device is enough low, the starting current is not more than 5A, the volume is littleer, can be applied to more use scenes.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A passive wireless infrared temperature measuring device is characterized by comprising a power-taking coil, a power supply conversion module, an infrared sensing module, an analog-to-digital conversion module and a wireless processing module; the power taking coil is connected with the power supply conversion module, the power supply conversion module is respectively connected with the infrared sensing module, the analog-to-digital conversion module and the wireless processing module, the infrared sensing module is connected with the analog-to-digital conversion module, and the analog-to-digital conversion module is connected with the wireless processing module; wherein,
the power taking coil is used for obtaining electric energy and providing a first voltage for the power supply conversion module;
the power supply conversion module is used for converting the first voltage into a second voltage and then supplying power to the infrared sensing module, the analog-to-digital conversion module and the wireless processing module;
the infrared sensing module is used for realizing temperature measurement and sending a temperature analog signal to the analog-to-digital conversion module;
the analog-to-digital conversion module is used for converting the temperature analog signal into a temperature digital signal and sending the temperature digital signal to the wireless processing module;
and the wireless processing module is used for wirelessly transmitting the temperature digital signal.
2. The passive wireless infrared temperature measuring device of claim 1, wherein the wireless processing module is further configured to control the transmission frequency according to a temperature difference between the current temperature digital signal and the previous temperature digital signal.
3. The passive wireless infrared temperature measuring device of claim 2, wherein the wireless processing module is further configured to reduce the transmission frequency when the temperature difference is less than a predetermined threshold.
4. The passive wireless infrared temperature measuring device of claim 3, wherein the power conversion module comprises a power management chip, and the leakage current of the power management chip is less than 10 uA.
5. The passive wireless infrared temperature measuring device of claim 4, wherein the power conversion module further comprises a linear voltage regulator, a first capacitor, a second capacitor, a third capacitor and an MOS (metal oxide semiconductor) transistor; wherein,
the input end of the linear voltage stabilizer is connected with the first end of the power taking coil, the output end of the linear voltage stabilizer is connected with the voltage input end of the power management chip, the output end of the linear voltage stabilizer is further connected with the infrared sensing module, the analog-to-digital conversion module and the wireless processing module respectively, and the grounding end of the linear voltage stabilizer is connected with an analog ground;
after the first capacitor, the second capacitor and the third capacitor are connected in parallel, a first end is connected with the output end of the linear voltage stabilizer, and after the first capacitor, the second capacitor and the third capacitor are connected in parallel, a second end is connected with an analog ground;
the grid electrode of the MOS tube is connected with the control end of the power management chip, the source electrode of the MOS tube is connected with the analog ground, and the drain electrode of the MOS tube is connected with the reference ground.
6. The passive wireless infrared temperature measuring device of claim 5, wherein the power conversion module further comprises a voltage doubling unit, and the voltage doubling unit is respectively connected with the power coil and the linear voltage regulator, and is configured to boost and rectify the first voltage to obtain the second voltage.
7. The passive wireless infrared temperature measuring device of claim 6, wherein the voltage doubling unit comprises a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor and a ninth capacitor; wherein,
the first diode, the second diode, the third diode, the fourth diode, the fifth diode and the sixth diode are connected in series, the cathode of the first diode is connected with the second end of the power taking coil, and the anode of the sixth diode is connected with the input end of the linear voltage stabilizer;
the first end of the fourth capacitor is connected with the first end of the power taking coil, and the second end of the fourth capacitor is connected with the anode of the first diode;
a first end of the fifth capacitor is connected with a second end of the power taking coil, and a second end of the fifth capacitor is connected with an anode of the second diode;
the first end of the sixth capacitor is connected with the first end of the electricity taking coil, and the second end of the sixth capacitor is connected with the anode of the third diode;
a first end of the seventh capacitor is connected with a second end of the power taking coil, and a second end of the seventh capacitor is connected with an anode of the fourth diode;
a first end of the eighth capacitor is connected with a first end of the power taking coil, and a second end of the eighth capacitor is connected with an anode of the fifth diode;
and the first end of the ninth capacitor is connected with the second end of the electricity taking coil, and the second end of the ninth capacitor is connected with the anode of the sixth diode.
8. The passive wireless infrared temperature measuring device of any one of claims 1 to 7, wherein the power-taking coil is made of iron-nickel alloy after annealing treatment.
9. The passive wireless infrared temperature measuring device of claim 8, further comprising a housing, and a first adhesive tape and a second adhesive tape disposed on two sides of the housing, wherein the power conversion module, the infrared sensing module, the analog-to-digital conversion module and the wireless processing module are integrally mounted in the housing, and the power coil is mounted in the first adhesive tape.
10. The passive wireless infrared temperature measuring device of claim 9, wherein the second adhesive tape is provided with at least one electricity-taking groove.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110631719A (en) * | 2019-08-23 | 2019-12-31 | 浙江杭宇电力设备有限公司 | Passive wireless temperature monitoring system with temperature control function |
| CN111969664A (en) * | 2020-07-16 | 2020-11-20 | 杭州宇诺电子科技有限公司 | Electric energy collection circuit and electric energy collection method of wireless temperature measuring device |
| WO2023039818A1 (en) * | 2021-09-17 | 2023-03-23 | 深圳市海一电器有限公司 | Temperature probe and smart kitchenware having same |
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Application publication date: 20190528 |