Environment monitoring circuit and system based on long-distance wireless power supply

Abstract

The invention discloses an environment monitoring circuit and system based on long-distance wireless power supply, which is used for converting a radio-frequency signal transmitted by a signal transmitting module into a direct-current power supply signal to supply power to the environment monitoring circuit and system, and comprises a power supply module and a monitoring module, wherein the power supply module is electrically connected with the monitoring module, and the power supply module receives a radio frequency signal through remote communication, converts the radio frequency signal into a direct current power supply signal, and outputs the direct current power supply signal to a power supply input end of the monitoring module; the monitoring module is used for collecting temperature and humidity data in the environment and outputting the temperature and humidity data to a user side through remote communication. Based on the radio frequency charging technology, long-distance wireless charging is achieved, multiple functional modules such as energy collection, power management, environment monitoring and wireless communication are integrated into one system, complexity is low, the system automatically collects temperature and humidity data and interacts with a user side, the automation degree is high, and operation efficiency and convenience are improved.

Description

Technical Field

[0001] The present invention relates to the field of information communication technology, and in particular to an environment monitoring circuit and system based on long-distance wireless power supply. Background Art

[0002] In the field of outdoor remote monitoring, traditional environmental temperature and humidity monitoring systems are generally equipped with lithium batteries for power supply. It is necessary to monitor the battery power and charge the battery at any time. The equipment consumes a lot of power and has a short battery life, which affects the operation of the overall environmental remote monitoring system. The efficiency of traditional radio frequency energy harvesting technology is 10%-20%, which is not suitable for application in actual production and life. At present, the mainstream charging and power supply methods use wired and coil electromagnetic induction wireless to provide power for environmental temperature and humidity monitoring systems. In actual production work, the use of wired charging in outdoor environments or power supply to remote equipment through power cables can easily cause wire wear and damage the insulation layer. There is a certain risk of leakage, which greatly increases the risk of inspection and maintenance and maintenance costs; while the use of coil electromagnetic induction wireless charging requires close contact, which is inconvenient to use.

[0003] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide an environment monitoring circuit and system based on long-distance wireless power supply to solve the problem that the existing environment monitoring circuit requires frequent charging and is difficult to use and maintain.

[0005] The technical solution of the present invention is as follows: An environmental monitoring circuit based on long-distance wireless power supply is used to receive and convert radio frequency signals through remote communication to power itself, and monitor temperature and humidity data and output them through remote communication. It includes a power supply module and a monitoring module, wherein the power supply module is electrically connected to the monitoring module, the power supply module receives the radio frequency signal through remote communication and converts it into a direct current power signal, and outputs the direct current power signal to the power input terminal of the monitoring module; The monitoring module is used to collect temperature and humidity data in the environment, obtain the temperature and humidity data and output it through remote communication.

[0006] According to a further configuration of the present invention, the power supply module comprises: a telecommunication antenna, a DC rectifier circuit and a power management circuit; wherein the telecommunication antenna is used to receive the radio frequency signal; The output end of the remote communication antenna is connected to the input end of the DC rectifier circuit, and the output end of the DC rectifier circuit is connected to the input end of the power management circuit, for converting the radio frequency signal into a first DC power signal; The output end of the power management circuit is connected to the input end of the monitoring module, and is used to boost the first DC power signal to a second DC power signal, and the second DC power signal provides electrical energy for the monitoring module.

[0007] In a further configuration of the present invention, the monitoring module comprises: a first control circuit, an environment monitoring circuit and a first wireless communication circuit, wherein the input end of the first control circuit is connected to the output end of the power supply module, and the output end of the first control circuit is connected to the first wireless communication circuit; The output end of the environmental monitoring circuit is connected to the first control circuit, and is used to collect and feed back the temperature and humidity data to the first control circuit; The first wireless communication circuit is used to output the temperature and humidity data to the user end through remote communication.

[0008] In a further configuration of the present invention, the DC rectifier circuit comprises: a matching circuit, a DC isolation circuit, a cross-junction microstrip line, a rectifier diode circuit, and an LC filter circuit, wherein the input end of the matching circuit is connected to a remote communication antenna, and the output end of the matching circuit is connected to one end of the DC isolation circuit for performing radio frequency impedance matching; The other end of the DC blocking circuit is connected to the first end of the cross-junction microstrip line, and is used to block the DC signal according to the capacitance characteristic; One end of the rectifier diode circuit is connected to the common terminal of the DC blocking circuit and the LC filter circuit through the second end and the fourth end of the cross-junction microstrip line respectively, and the other end of the rectifier diode circuit is grounded, for impedance compensation of the imaginary part of the input impedance; The input end of the LC filter circuit is connected to the third end of the cross-junction microstrip line, and the output end of the LC filter circuit is connected to the power management circuit for bandpass filtering.

[0009] According to a further configuration of the present invention, the matching circuit comprises: a first T-type microstrip line, a first terminal short-circuit line, and a second microstrip line, wherein the first end of the first T-type microstrip line is connected to the output end of the remote communication antenna, the second end of the first T-type microstrip line is connected to the first end of the first terminal short-circuit line, the other end of the first terminal short-circuit line is grounded, the third end of the first T-type microstrip line is connected to one end of the second microstrip line, and the other end of the second microstrip line is connected to the DC isolation circuit; According to a further configuration of the present invention, the LC filtering circuit includes: a fourth microstrip line, a first inductor, a fifth microstrip line, a second T-type microstrip line, a sixth microstrip line, a third capacitor and a seventh microstrip line, wherein one end of the fourth microstrip line is connected to the third end of the cross-junction microstrip line, the other end of the fourth microstrip line is connected to one end of the first inductor, the other end of the first inductor is connected to one end of the fifth microstrip line, the other end of the fifth microstrip line is connected to the first end of the second T-type microstrip line, the second end of the second T-type microstrip line is connected to the positive terminal of the third capacitor, the negative terminal of the third capacitor is connected to the first end of the sixth microstrip line, the other end of the sixth microstrip line is grounded, the third end of the second T-type microstrip line is connected to one end of the seventh microstrip line, and the other end of the seventh microstrip line is connected to the power management circuit.

[0010] The present invention is further configured such that the rectifier diode circuit includes a first rectifier diode circuit and a second rectifier diode circuit, wherein the first rectifier diode circuit includes a thirteenth microstrip line, a twelfth microstrip line, a first rectifier diode array, and an eleventh microstrip line, one end of the thirteenth microstrip line is grounded, and the other end is connected to one end of the twelfth microstrip line, the other end of the twelfth microstrip line is connected to the positive electrode of the first rectifier diode array, the negative electrode of the first rectifier diode array is connected to one end of the eleventh microstrip line, and the other end of the eleventh microstrip line is connected to the second end of the cross-junction microstrip line; The second rectifier diode circuit includes an eighth microstrip line, a ninth microstrip line, a second rectifier diode array, and a tenth microstrip line. One end of the eighth microstrip line is grounded, and the other end is connected to one end of the ninth microstrip line. The other end of the ninth microstrip line is connected to the positive electrode of the second rectifier diode array, the negative electrode of the second rectifier diode array is connected to one end of the tenth microstrip line, and the other end of the tenth microstrip line is connected to the second end of the cross-junction microstrip line.

[0011] According to a further configuration of the present invention, the first rectifier diode circuit further includes a second tuning capacitor, a cathode of the second tuning capacitor is connected to a cathode of the first rectifier diode array, and a cathode of the second tuning capacitor is grounded.

[0012] Based on the same inventive concept, the present invention discloses an environment monitoring system based on long-distance wireless power supply, which comprises: a signal transmitting module, an environment monitoring circuit based on long-distance wireless power supply as described above, and a user end; The first signal transmitting end of the signal transmitting module establishes remote communication with the first signal transmitting end of the environment monitoring circuit based on long-distance wireless power supply, and the signal transmitting module is used to generate a radio frequency signal and output the radio frequency signal to the environment monitoring circuit based on long-distance wireless power supply through remote communication; The second signal transmission end of the environmental monitoring circuit based on long-distance wireless power supply is connected to the user end through remote communication; the environmental monitoring circuit based on long-distance wireless power supply is used to convert the radio frequency signal into a direct current power supply signal, power the environmental monitoring circuit based on long-distance wireless power supply itself, and collect temperature and humidity data at the same time, the second signal transmission end of the environmental monitoring circuit based on long-distance wireless power supply establishes remote communication with the user communication end of the user end, and sends the temperature and humidity data to the user end through the second signal transmission end; The user end is used to interact with the environmental monitoring circuit based on long-distance wireless power supply and display the temperature and humidity data to the user.

[0013] According to a further configuration of the present invention, the user end includes: a second wireless communication circuit, a second control circuit and a host computer, wherein the second wireless communication circuit is connected to the second signal transmission end of the environmental monitoring circuit based on long-distance wireless power supply, and is used to receive and send interactive information; when the second wireless communication circuit receives a signal sent by the environmental monitoring circuit based on long-distance wireless power supply, the interactive information is temperature and humidity data, and the second wireless communication circuit sends the temperature and humidity data to the second control circuit accordingly; when the second wireless communication circuit receives a signal sent by the second control circuit, the interactive information is a second feedback signal, and the second wireless communication circuit sends the second feedback signal to the environmental monitoring circuit based on long-distance wireless power supply accordingly; The second control circuit is connected to the host computer, and is used to output the temperature and humidity data to the host computer and receive a control signal sent by the user through the host computer; The host computer is provided with a user interface for receiving the temperature and humidity data sent by the second control circuit, displaying the temperature and humidity data to the user, and sending a control signal generated by user interaction to the second control circuit.

[0014] The present invention discloses an environmental monitoring circuit and system based on long-distance wireless power supply, which is used to convert the radio frequency signal emitted by the signal transmission module into a DC power signal to power itself, and includes a power supply module and a monitoring module, wherein the power supply module is electrically connected to the monitoring module, the power supply module receives the radio frequency signal through remote communication and converts it into a DC power signal, and outputs the DC power signal to the power input terminal of the monitoring module; the monitoring module is used to collect temperature and humidity data in the environment, and output the temperature and humidity data to the user end through remote communication. The present invention is based on radio frequency charging technology to achieve long-distance wireless charging, and at the same time integrates multiple functional modules such as energy collection, power management, environmental monitoring, and wireless communication into one system, with low complexity, and the system automatically collects temperature and humidity data and interacts with the user end, with a high degree of automation, which improves operational efficiency and convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary personnel in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0016] Figure 1 It is a functional module architecture diagram of an environmental monitoring circuit based on long-distance wireless power supply in the present invention.

[0017] Figure 2 It is a functional module architecture diagram of the long-distance wireless power supply system used for environmental monitoring in the present invention.

[0018] Figure 3 It is a circuit schematic diagram of a DC rectifier circuit of an environmental monitoring circuit based on long-distance wireless power supply in some preferred embodiments of the present invention.

[0019] Figure 4 It is a circuit schematic diagram of a power management circuit of an environmental monitoring circuit based on long-distance wireless power supply in some preferred embodiments of the present invention.

[0020] Figure 5 It is a circuit schematic diagram of the first control circuit of the environment monitoring circuit based on long-distance wireless power supply in some preferred embodiments of the present invention.

[0021] Figure 6 It is a diagram of efficiency simulation results after impedance matching in some preferred embodiments of the present invention.

[0022] Figure 7 It is the signal conversion efficiency of the DC rectifier circuit in some preferred embodiments of the present invention.

[0023] Figure 8 It is the voltage output result of the DC rectifier circuit in some preferred embodiments of the present invention. DETAILED DESCRIPTION

[0024] The present invention provides an environmental monitoring circuit and system based on long-distance wireless power supply. In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] In the embodiments and the scope of the patent application, unless the text specifically defines the article, "a", "an", "the" and "the" may also include plural forms. If there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0026] It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there can be intermediate elements. In addition, the "connection" or "coupling" used herein can include wireless connection or wireless coupling. The term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0027] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as herein.

[0028] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0029] In the embodiments and the scope of the patent application, unless the text specifically defines the article, "a", "an", "the" and "the" may also include plural forms. If there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0030] It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there can be intermediate elements. In addition, the "connection" or "coupling" used herein can include wireless connection or wireless coupling. The term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0031] Those skilled in the art will understand that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art in the field to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as here.

[0032] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] Please also read Figure 1 and Figure 2The present invention provides a preferred embodiment of an environmental monitoring circuit based on long-distance wireless power supply. In some preferred embodiments, the present invention provides an environmental monitoring circuit based on long-distance wireless power supply, which is used to receive and convert radio frequency signals through remote communication to power itself, and simultaneously monitor temperature and humidity data and output them through remote communication. It includes a power supply module 1100 and a monitoring module 1200, wherein the power supply module 1100 is electrically connected to the monitoring module 1200, the power supply module 1100 receives the radio frequency signal through remote communication and converts it into a DC power signal, and outputs the DC power signal to the power input terminal of the monitoring module 1200; the monitoring module 1200 is used to collect temperature and humidity data in the environment, obtain the temperature and humidity data and output them through remote communication.

[0034] Specifically, the power supply module 1100 and the monitoring module 1200 are respectively provided with antennas or antenna groups. When the environmental monitoring circuit 1220 needs to be powered, the power supply module 1100 receives the radio frequency signal in the space electric field through the antenna or antenna group. Preferably, in some preferred embodiments, the radio frequency signal is a radio frequency signal with an operating frequency bandwidth of 1.8GHz to 3GHz, and other radio frequency bands such as 5GHz and 900MHz can also be used for energy collection. The radio frequency signal is converted into a DC power signal in the power supply module 1100 and output to the power input end of the monitoring module 1200 to power the monitoring module 1200, so that the environmental monitoring circuit based on long-distance wireless power supply can work normally without battery power supply. In the working state, the monitoring module 1200 is used to realize environmental monitoring and obtain ambient temperature and humidity data. The monitoring module 1200 can also establish remote communication with the outside through the set antenna or antenna group, and send the obtained temperature and humidity data to the outside through remote communication.

[0035] Furthermore, the power supply module 1100 includes: a remote communication antenna 1110, a DC rectifier circuit 1120 and a power management circuit 1130; wherein the remote communication antenna 1110 is used to receive the radio frequency signal; the output end of the remote communication antenna 1110 is connected to the input end of the DC rectifier circuit 1120, and the output end of the DC rectifier circuit 1120 is connected to the input end of the power management circuit 1130, for converting the radio frequency signal into a first DC power signal; the output end of the power management circuit 1130 is connected to the input end of the monitoring module 1200, for boosting the first DC power signal to a second DC power signal, and the second DC power signal is used to provide electrical energy to the monitoring module 1200. The remote communication antenna is used to establish remote communication with the outside world, collects energy of the space electric field as a remote power receiving end, and outputs the radio frequency signal to the DC rectifier circuit 1120, and the DC rectifier circuit 1120 is used to convert the radio frequency signal into a first DC power signal, and then boost the first DC power signal to a second DC power signal through the power management circuit 1130. Specifically, the second DC source signal is 3.3V, and is output to the power input end of the monitoring module 1200 to provide power for the normal operation of the monitoring module 1200.

[0036] Further, please refer to Figures 1 to 3 The DC rectifier circuit 1120 includes: the DC rectifier circuit includes: a matching circuit 1121, a DC isolation circuit C1, a third microstrip line TL3, a cross-junction microstrip line CROS1, a rectifier diode circuit, a fourth microstrip line TL4 and an LC filter circuit, the input end of the matching circuit is connected to the remote communication antenna, and the output end of the matching circuit is connected to one end of the DC isolation circuit C1 for radio frequency impedance matching; the other end of the DC isolation circuit C1 is connected to the first end of the cross-junction microstrip line CROS1 for blocking DC signals according to capacitance characteristics; one end of the rectifier diode circuit is connected to the common end of the DC isolation circuit and the LC filter circuit through the second end and the fourth end of the cross-junction microstrip line respectively, and the other end of the rectifier diode circuit is grounded for impedance compensation of the imaginary part of the input impedance; the input end of the LC filter circuit is connected to the cross-junction microstrip line CROS1, and the output end of the LC filter circuit is connected to the power management circuit for bandpass filtering.

[0037] For details, please refer to Figure 3 and Figure 6, the matching circuit 1121 is a single-branch short-stub matching circuit, and the matching circuit 1121 is used to perform conjugate matching on the left side of the node, that is, the input side of the matching circuit, so as to maximize power transmission and minimize reflection loss. The matching circuit 1121 includes: a first T-type microstrip line Tee1, a first terminal short-circuit line TL1, and a second microstrip line TL2, wherein the first end of the first T-type microstrip line Tee1 is connected to the output end of the remote communication antenna 1110, the second end of the first T-type microstrip line Tee1 is connected to the first end of the first terminal short-circuit line TL1, the other end of the first terminal short-circuit line TL1 is grounded, the third end of the first T-type microstrip line Tee1 is connected to one end of the second microstrip line TL2, and the other end of the second microstrip line TL2 is connected to the DC isolation circuit C1.

[0038] Figure 6 FIG. 1 is a Smith chart of the matching circuit 1121 in the present invention. Figure 6 The left figure shows the port impedance on the left side of the DC rectifier circuit 1120 node at different frequencies. Figure 6 The right figure shows the impedance on the right side of the node of the DC rectifier circuit 1120 at different frequencies. It can be obtained that the port impedance of the input end is Z=50.785+j*7.657. In order to meet the impedance matching, the network input impedance of the signal input DA_SSMatch1 is matched with its conjugate, then DA_SSMatch1, that is, the network input impedance of the matching circuit is Zin=50.785-j*7.657. At this time, the width W of the three ends of the first T-type microstrip line Tee1 is 2.735mm, the width of the first terminal short-circuit line TL1 is 2.735mm, and the length is 11.237mm. The width of the second microstrip line TL2 is 2.735mm and the length is 20.293mm. The matching circuit is used to match the impedance of the source end and the terminal, reduce the reflection of the signal, and improve the rectification efficiency.

[0039] Further, the DC blocking circuit includes a DC blocking capacitor C1. In some preferred embodiments, the DC blocking capacitor C1 is a polarized capacitor, the negative terminal of the DC blocking capacitor C1 is connected to the output terminal of the matching circuit 1121, and the positive terminal of the DC blocking capacitor C1 is connected to the first end of the cross-junction microstrip line CROS1 to prevent the rectified DC voltage from reflecting back to the input terminal. Further, in further implementation of some preferred embodiments, the DC blocking circuit also includes a third microstrip line, one end of the third microstrip line is connected to the positive terminal of the DC blocking capacitor C1, and the other end of the third microstrip line is connected to the first section of the tenth microstrip line TL10.

[0040] The rectifier diode circuit includes a first rectifier diode circuit 1124 and a second rectifier diode circuit 1125. The first rectifier diode circuit 1124 includes: a thirteenth microstrip line TL13, a twelfth microstrip line TL12, a first rectifier diode array D1, and an eleventh microstrip line TL11. One end of the thirteenth microstrip line TL13 is grounded, and the other end is connected to one end of the twelfth microstrip line TL12. The other end of the twelfth microstrip line TL12 is connected to the positive electrode of the first rectifier diode array D1. The negative electrode of the first rectifier diode array D1 is connected to one end of the eleventh microstrip line TL11. The other end of the eleventh microstrip line TL11 is connected to the second end of the cross-junction microstrip line CROS1. The structure of the first rectifier diode circuit 1124 is the same as that of the second rectifier diode circuit 1125. The second rectifier diode circuit 1125 includes: an eighth microstrip line, a ninth microstrip line, a second rectifier diode array D2, and a tenth microstrip line TL10. One end of the eighth microstrip line is grounded, and the other end is connected to one end of the ninth microstrip line. The other end of the ninth microstrip line is connected to the positive electrode of the second rectifier diode array D2. The negative electrode of the second rectifier diode array D2 is connected to one end of the tenth microstrip line TL10. The other end of the tenth microstrip line TL10 is connected to the second end of the cross-junction microstrip line CROS1. The second rectifier diode circuit 1125 and the first rectifier diode circuit 1124 are used to ensure that each impedance unit is at the center frequency, and the characteristic impedance of the microstrip line is used to compensate for the imaginary part of the input impedance of the unit. Thereby ensuring that the diode rectifier array can effectively absorb and convert radio frequency signals in the entire frequency band. The first rectifier diode array D1 and the second rectifier diode array D2 are Schottky diode rectifier arrays HSMS286B.

[0041] Furthermore, in another preferred embodiment, the second rectifier diode circuit 1125 and the first rectifier diode circuit 1124 may also add a capacitor for resonating the real part of the input impedance. Exemplarily, taking the first rectifier diode circuit 1124 as an example, the first rectifier diode circuit 1124 also includes a second tuning capacitor C2, the cathode of the second tuning capacitor C2 is connected to the cathode of the first rectifier diode array D1, and the anode of the second tuning capacitor C2 is connected to the anode of the first rectifier diode array D1, so as to tune the real part by adding a second resonant capacitor to optimize the performance of the circuit. Specifically, the second rectifier diode circuit is a high-frequency band rectifier array, and the first rectifier diode circuit is a low-frequency band rectifier array.

[0042] For the first rectifier diode array with known input power and DC load, the equivalent model can be expressed as Re in parallel with capacitor Ce, and the input impedance is defined as: ; Wherein, Re is the equivalent resistance of the first rectifier diode array, Ce is the equivalent capacitance of the first rectifier diode array, is the second resonant capacitor value, Z 1 is the characteristic impedance of the microstrip line, let: ; Then the input impedance Z inA for: ; in, is the signal frequency. At this time, the real part of the impedance of the first rectifier diode circuit 1124 can be expressed as:

[0043] Among them, because the equivalent capacitance in the circuit is in the pF level, The value of is much smaller than 1. By setting the value of the second resonant capacitor to , which can make Increase, and thus reduce, the real part of the impedance of the first rectifier diode circuit 1124.

[0044] Furthermore, the impedance of the first rectifier diode circuit is further reduced, and the characteristic impedance of the microstrip line is adjusted so that the imaginary part of the impedance of the first rectifier diode circuit 1124 is 0, then:

[0045] At this time, the microstrip line characteristic impedance in the first rectifier diode circuit is equivalent to:

[0046] Usually in circuit design, the corresponding equivalent parameters can be calculated through the shape and related dimensions of a transmission line connected to a load. Here, the twelfth microstrip line TL12 is taken as an example, and the impedance of the imaginary part is adjusted by adjusting the twelfth microstrip line TL12. The impedance calculation formula of the microstrip line is:

[0047] in, is the characteristic impedance of the microstrip line, is the relative dielectric constant of the medium, is the thickness of the medium, The characteristic impedance of the transmission line is determined by using equivalent parameters, and then the system impedance composed of the twelfth microstrip line TL12 and the load is calculated according to the impedance value of the load, thereby obtaining the basic parameters of the transmission line.

[0048] The operating frequency of the second rectifier diode circuit 1125 is higher than the operating frequency of the first rectifier diode circuit 1124. Therefore, the real part of the input impedance corresponding to the second rectifier diode circuit 1125 is relatively low, and no additional resonant capacitor is required. Similar to the first rectifier diode circuit 1124, the second rectifier diode circuit 1125 is used to make the imaginary part of the input impedance 0 by matching. The calculation method of the second rectifier diode circuit is the same as that of the first rectifier diode circuit described above. The impedance of the imaginary part is adjusted by adjusting the ninth microstrip line TL9, which is not described in detail here.

[0049] The LC filtering circuit includes: a fourth microstrip line TL4, a first inductor L1, a fifth microstrip line TL5, a second T-type microstrip line Tee2, a fifth microstrip line TL5, a sixth microstrip line TL6, a third capacitor C3 and a seventh microstrip line TL7, wherein one end of the fourth microstrip line TL4 is connected to the third end of the cross-junction microstrip line, the other end of the fourth microstrip line TL4 is connected to one end of the first inductor L1, the other end of the first inductor L1 is connected to one end of the fifth microstrip line TL5, the other end of the fifth microstrip line TL5 is connected to the first end of the second T-type microstrip line Tee2, the second end of the second T-type microstrip line Tee2 is connected to the positive terminal of the third capacitor C3, the negative terminal of the third capacitor C3 is connected to the first end of the sixth microstrip line TL6, the other end of the sixth microstrip line TL6 is grounded, the third end of the second T-type microstrip line Tee2 is connected to one end of the seventh microstrip line TL7, and the other end of the seventh microstrip line TL7 is connected to the power management circuit. The LC filter circuit 1122 is used as a bandpass filter to suppress harmonics and improve signal quality. The LC filter circuit 1122 also uses a single-branch short-section matching circuit as the output end of the DC rectifier circuit, so that the LC filter circuit 1122 can be used for load impedance matching on the output side while performing bandpass filtering, thereby simplifying the circuit setting of the DC rectifier circuit and filtering the signal rectified by the rectifier diode circuit into a smooth DC voltage.

[0050] Furthermore, the port impedance at the voltage input end is obtained by using simulation software, and the voltage input end, i.e., the source impedance Zin1=zin(S11,PortZ1) on the left side of the node, wherein S11 is the reflection coefficient of the voltage input end, and PortZ1 is the impedance of the voltage input end. It can be measured that the network input impedance seen from the voltage input end is Z=61.738-j*42.82, i.e., the load impedance Zload=61.738-j*42.82 of DA_SSMatch1. At this time, the width of the three ends of the second T-type microstrip line Tee2 is 0.5mm, the width of the sixth microstrip line TL6 is 3mm, the length is 1.8mm, and the width of the seventh microstrip line TL7 is 0.5mm, the length is 3mm. Thus, the impedance of the source end and the terminal end is matched by the matching circuit, the reflection of the signal is reduced, and the rectification efficiency is improved.

[0051] The signal conversion efficiency and voltage output results of the DC rectifier circuit 1120 in the present invention are respectively as follows: Figure 7 , Figure 8 As shown. Figure 7 It can be seen that when the DC rectifier circuit 1120 is in the frequency range of 2.0GHz-2.7GHz, the conversion efficiency of the circuit is higher than 75%. For example, when working in m4: RF frequency 2.4Ghz, the signal conversion efficiency is 78.5%; when working in m2: RF frequency 2.45Ghz, the conversion efficiency is 80%; when working in m5: RF frequency 2.5Ghz, the conversion efficiency is 75.6%. It can be seen that when the DC rectifier circuit 1120 in the present invention works at a frequency of 2.45GHz, the conversion efficiency is the highest value of 80%. At the same time, Figure 8 This is an output voltage test diagram at the output end of the DC rectifier circuit 1120 in the present invention when it is in working state. After the DC rectifier circuit 1120 starts working, the voltage output value rises from 0V to 1.2V within 10 nanoseconds, which meets the actual working requirements of the environmental monitoring circuit design based on long-distance wireless power supply.

[0052] For further information, see Figure 4The power management circuit 1130 in the present invention is used to perform a BOOST boost function, including: a boost chip, a second inductor L2, a third inductor L3, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a fourth capacitor C4 and a fifth capacitor C5, one end of the second inductor L2 is connected to the output end of the DC rectifier circuit 1120, the other end of the second inductor L2 is connected to the boost switch pin of the boost chip, one end of the fourth capacitor C4 is connected to the energy storage pin VBAT of the boost chip, and the other end of the fourth capacitor C4 is grounded; one end of the third inductor L3 is connected to the buck switch pin of the boost chip, and the other end of the third inductor L3 is connected to the buck switch pin of the boost chip. , the common end of the voltage output pin of the boost chip and the fifth capacitor C5 is connected to the power input end of the monitoring module 1200, and the other end of the fifth capacitor C5 is grounded; the bias voltage pin of the boost chip is respectively connected to one end of the first resistor R1, one end of the second resistor R2 and one end of the third resistor R3, the other end of the second resistor R2 is connected to the fifth resistor R5, the other end of the first resistor R1 is connected to one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected to one end of the seventh resistor R7, the other end of the third resistor R3 is connected to one end of the sixth resistor R6, and the other end of the fifth resistor R5, the other end of the sixth resistor R6 and the other end of the seventh resistor R7 are grounded. The hysteresis threshold pin OK_HYST of the boost chip is connected to the common end of the first resistor R1 and the fourth resistor R4, the threshold pin OK_PROG of the boost chip is connected to the common end of the fourth resistor R4 and the seventh resistor R7, the overvoltage threshold pin VBAT_OV of the boost chip is connected to the common end of the second resistor R2 and the fifth resistor R5, and the output voltage setting pin VOUT_SET of the boost chip is connected to the common end of the third resistor R3 and the sixth resistor R6.

[0053] Exemplarily, in some preferred embodiments, the boost chip uses a bq25570 chip based on TI, and the fourth capacitor C4 is a farad capacitor with a capacity of 1 F. Specifically, the standard voltage of the power management circuit 1130 is set to 3.7V, that is, VBAT_OK_HYST is 3.7V; the output voltage is 3.3V to power the electrical appliances, that is, VBAT_OK_PROG is 3.3V, and VOUT is 3.3V; the overvoltage protection threshold is set to 4.2V, that is, VBAT_OV is 4.2V.

[0054] Specifically, the battery voltage reduction threshold VBAT_OK_PROG and the battery voltage boost threshold VBAT_OK_HYST are set by the first resistor R1, the fourth resistor R4 and the seventh resistor R7, and the calculation formula is as follows:

[0055]

[0056] The Vout output voltage is set by the resistance of the third resistor R3 and the sixth resistor R6, and can be set in the range of 1.3V to VBAT_OV. The calculation formula is as follows:

[0057] The overvoltage threshold VBAT_OV of the energy storage element is set by the resistance values ​​of the second resistor R2 and the fifth resistor R5, and the setting range is 1.95V-5.5V. The calculation formula is as follows:

[0058] Among them, VBIAS is the reference voltage 1.21V. By calculating the above formula, we can get that the first resistor R1=1.4MΩ, the second resistor R2=7.32MΩ, the third resistor R3=8.25MΩ, the fourth resistor R4=7.32MΩ, the fifth resistor R5=5.6MΩ, the sixth resistor R6=4.75MΩ, and the seventh resistor R7=4.22MΩ. Then the power management module boosts the first DC power signal to a second DC power signal of 3.3V to power the monitoring module 1200, ensuring that the monitoring module 1200 works stably.

[0059] Please also refer to Figure 2 , Figure 5, the monitoring module 1200 includes: a first control circuit 1210, an environment monitoring circuit 1220 and a first wireless communication circuit 1230, the input end of the first control circuit 1210 is connected to the output end of the power supply module 1100, and the output end of the first control circuit 1210 is connected to the first wireless communication circuit 1230; the output end of the environment monitoring circuit 1220 is connected to the first control circuit 1210, used to obtain the temperature and humidity data, and feedback to the first control circuit 1210; the first wireless communication circuit 1230 is used to output the temperature and humidity data through remote communication and receive the feedback signal sent back. When the monitoring module 1200 is working normally, the environment monitoring circuit 1220 is used to collect the temperature and humidity data in the surrounding environment and transmit it to the first control circuit 1210, the first control circuit 1210 receives the temperature and humidity data, and outputs it to the first wireless communication circuit 1230 through the output end of the first control circuit 1210, and the first wireless communication circuit 1230 establishes remote communication and sends the temperature and humidity data outward. In some preferred embodiments of the present invention, the environmental monitoring circuit 1220 is a temperature and humidity sensor, which uses TI's HDC1080 chip to collect environmental temperature and humidity data. The environmental monitoring circuit can also be a monitoring device and circuit for other environmental data such as air quality, precipitation, air pollution, or sound and light pollution, etc., which is not limited here.

[0060] Specifically, Figure 5As shown, the control module includes a single-chip microcomputer, a voltage stabilizing circuit, a filtering circuit, a crystal oscillator circuit, a reset circuit, an environment monitoring port circuit, and a first wireless communication port circuit. The output end of the voltage stabilizing circuit is connected to the input end of the filtering circuit, and the output end of the filtering circuit is connected to the analog power input end of the single-chip microcomputer; the crystal oscillator circuit is connected to the external oscillator pin of the single-chip microcomputer, the reset circuit is connected to the reset pin of the single-chip microcomputer, one end of the environment monitoring port circuit is connected to the first signal end and the second signal end of the single-chip microcomputer, and the other end of the environment monitoring port circuit is connected to the environment monitoring circuit 1220. Exemplarily, the first wireless communication circuit 1230 can use a LoRa wireless communication module, and the temperature and humidity sensor obtains the temperature and humidity data in the environment, communicates with the single-chip microcomputer through the integrated circuit bus (Inter-Integrated Circuit, IIC), and sends the data to the single-chip microcomputer. The single-chip microcomputer sends the data to the lora wireless communication module through the UART serial port, and finally transmits the data outward through the antenna through the module. LoRa wireless communication has the characteristics of long transmission distance, low working power consumption, multiple networking nodes, strong anti-interference, low cost, and long-distance communication capability, and is suitable for achieving a communication distance of up to several kilometers. The present invention adopts the E22-230T22D module to implement LoRa wireless communication technology, which can transmit temperature and humidity data to the user end in real time over a long distance, and is suitable for use in places with rugged terrain and harsh environment.

[0061] When the control circuit works normally, the output end of the power management circuit 1130 is connected to the power end of the single-chip microcomputer, the environmental monitoring port circuit, and the first wireless communication port circuit, and the second DC power signal after the boost is 3.3V, which powers the STM32 single-chip microcomputer, temperature and humidity sensor, lora wireless communication and other modules in the monitoring module 1200. The temperature sensor CJMCU-1080 module obtains the temperature and humidity of the environment, and the single-chip microcomputer stm32 communicates with the sensor through the two pins PC12 and PC11 to simulate IIC to obtain temperature and humidity data, and then sends it to the lora module through the serial port communication established by PA2 and PA3. The core of the present invention is to utilize the radio frequency charging method, so it is necessary to reduce the system power consumption as much as possible. Optionally, the present invention can also further reduce the overall power consumption of the environmental monitoring circuit based on long-distance wireless power supply by setting the STM32 single-chip microcomputer to standby mode, selecting a temperature and humidity module with low power consumption function, and setting the lora communication module to sleep mode.

[0062] See also Figure 1In some embodiments, the present invention further provides an environment monitoring system based on long-distance wireless power supply, which comprises: a signal transmitting module 2000, an environment monitoring circuit based on long-distance wireless power supply as described above, and a user end; a first signal transmitting end of the signal transmitting module 2000 establishes remote communication with a first signal transmitting end of the environment monitoring circuit 1000 based on long-distance wireless power supply, and the signal transmitting module 2000 is used to generate a radio frequency signal, and output the radio frequency signal to the environment monitoring circuit 1000 based on long-distance wireless power supply through remote communication; a second signal transmitting end of the environment monitoring circuit 1000 based on long-distance wireless power supply The signal transmission end is connected to the user end through remote communication; the environmental monitoring circuit 1000 based on long-distance wireless power supply is used to convert the radio frequency signal into a DC power signal, power the environmental monitoring circuit 1000 based on long-distance wireless power supply itself, and simultaneously collect temperature and humidity data; the second signal transmission end of the environmental monitoring circuit 1000 based on long-distance wireless power supply establishes remote communication with the user communication end of the user end, and sends the temperature and humidity data to the user end through the second signal transmission end; the user end is used to interact with the environmental monitoring circuit 1000 based on long-distance wireless power supply, and display the temperature and humidity data to the user.

[0063] Specifically, the signal transmission module 2000 includes a signal transmitter 2100, which can be various base stations, radio stations, WiFi or specific transmitters, and establishes remote communication with the environmental monitoring circuit 1000 based on long-distance wireless power supply, generates and transmits energy to the space electric field, which is used to supply the environmental monitoring circuit 1000 based on long-distance wireless power supply through the first signal transmission end, that is, the antenna to receive and convert it into electrical energy. The environmental monitoring circuit 1000 based on long-distance wireless power supply uses the electrical energy to collect temperature and humidity data in the environment and obtains the corresponding temperature and humidity data. The environmental monitoring circuit 1000 based on long-distance wireless power supply sends the temperature and humidity data to the user terminal through the second signal transmission end through remote communication, and the user terminal displays it to the user. At the same time, when the user operates the user terminal, the user terminal generates interactive information accordingly, and sends it to the environmental monitoring circuit 1000 based on long-distance wireless power supply through remote communication. The environmental monitoring circuit 1000 based on long-distance wireless power supply can receive the interactive information sent by the user terminal through remote communication. This makes it possible to use the collected radio frequency energy to power electrical appliances, automatically monitor the ambient temperature and humidity, and remotely interact with the user.

[0064] Furthermore, the user end includes: a second wireless communication circuit 3300, a second control circuit 3200 and a host computer 3100, wherein the second wireless communication circuit 3300 is connected to the second signal transmission end of the environmental monitoring circuit 1000 based on long-distance wireless power supply, and is used to receive and send interactive information; when the second wireless communication circuit 3300 receives a signal sent by the environmental monitoring circuit 1000 based on long-distance wireless power supply, the interactive information is temperature and humidity data, and the second wireless communication circuit 3300 sends the temperature and humidity data to the second control circuit 3200 accordingly; when the second wireless communication circuit 3300 receives the signal sent by the second control circuit The second control circuit 3200 is connected to the host computer 3100, and is used to output the temperature and humidity data to the host computer 3100, and receive the control signal sent by the user through the host computer 3100; the host computer 3100 is provided with a user interface, which is used to receive the temperature and humidity data sent by the second control circuit 3200, and display the temperature and humidity data to the user, and send the control signal generated by the user interaction to the second control circuit 3200.

[0065] In summary, the present invention discloses an environmental monitoring circuit and system based on long-distance wireless power supply, which is based on radio frequency charging technology, uses space electric field as a medium for energy transmission, and can realize long-distance wireless charging. The beneficial effect of the present invention is that for some occasions where close-range transmission of electric energy is not allowed or there is no power supply, such as forest deserts, urban underground pipe networks or bridges, marine environments, disaster areas, etc., radio frequency charging can solve the limitations of traditional charging methods such as no power supply and frequent replacement of batteries. And the present invention is an environmental temperature and humidity remote monitoring system based on radio frequency charging technology. Compared with the traditional temperature and humidity monitoring system, this system does not require batteries, has extremely low power consumption, and when not working, the current is as low as 2uA, and the device is equipped with a lora wireless module to communicate with the console over a long distance. The radio frequency energy collection system of the present invention has an efficiency of more than 60% in a bandwidth of 1.8GHz to 3GHz, which is greatly improved compared to the efficiency of traditional radio frequency energy collection technology, and improves the practical application value of the system, and is particularly suitable for wireless remote monitoring systems. And the current in the sleep mode state is as low as 2uA, and it can still work stably when the input power is as low as 0dbm. This low-power design is very suitable for scenarios where long-term operation and battery replacement are not easy, and is particularly important in environmental monitoring equipment and IoT applications.

[0066] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. An environmental monitoring circuit based on long-distance wireless power supply, used to convert the radio frequency signal emitted by the signal transmission module into a DC power signal to power itself, characterized in that: It includes a power supply module and a monitoring module, among which, The power supply module is electrically connected to the monitoring module, and the power supply module receives the radio frequency signal through remote communication and converts it into a direct current power signal, and outputs the direct current power signal to the power input terminal of the monitoring module; The monitoring module is used to collect temperature and humidity data in the environment, and output the temperature and humidity data to the user end through remote communication.

2. The environmental monitoring circuit based on long-distance wireless power supply according to claim 1 is characterized in that: The power supply module includes: a remote communication antenna, a DC rectifier circuit and a power management circuit; wherein, The output end of the remote communication antenna is connected to the input end of the DC rectifier circuit for receiving the radio frequency signal; The output end of the DC rectifier circuit is connected to the input end of the power management circuit, and is used to convert the radio frequency signal into a first DC power signal; The output end of the power management circuit is connected to the input end of the monitoring module, and is used to boost the first DC power signal to a second DC power signal, and the second DC power signal provides electrical energy for the monitoring module.

3. The environmental monitoring circuit based on long-distance wireless power supply according to claim 2 is characterized in that: The monitoring module includes: a first control circuit, an environment monitoring circuit and a first wireless communication circuit, wherein: The input end of the first control circuit is connected to the output end of the power supply module, and the output end of the first control circuit is connected to the first wireless communication circuit; The output end of the environmental monitoring circuit is connected to the first control circuit, and is used to collect and feed back the temperature and humidity data to the first control circuit; The first wireless communication circuit is used to output the temperature and humidity data to the user end through remote communication.

4. The environmental monitoring circuit based on long-distance wireless power supply according to claim 2, characterized in that: The DC rectifier circuit includes: a matching circuit, a DC blocking circuit, a cross-junction microstrip line, a rectifier diode circuit, and an LC filter circuit, wherein: The input end of the matching circuit is connected to the remote communication antenna, and the output end of the matching circuit is connected to one end of the DC isolation circuit for performing radio frequency impedance matching; The other end of the DC blocking circuit is connected to the first end of the cross-junction microstrip line, and is used to block the DC signal according to the capacitance characteristic; One end of the rectifier diode circuit is connected to the common terminal of the DC blocking circuit and the LC filter circuit through the second end and the fourth end of the cross-junction microstrip line respectively, and the other end of the rectifier diode circuit is grounded, for impedance compensation of the imaginary part of the input impedance; The input end of the LC filter circuit is connected to the third end of the cross-junction microstrip line, and the output end of the LC filter circuit is connected to the power management circuit for bandpass filtering.

5. The environmental monitoring circuit based on long-distance wireless power supply according to claim 4 is characterized in that: The matching circuit includes: a first T-type microstrip line, a first terminal short-circuit line, and a second microstrip line, wherein the first end of the first T-type microstrip line is connected to the output end of the remote communication antenna, the second end of the first T-type microstrip line is connected to the first end of the first terminal short-circuit line, the other end of the first terminal short-circuit line is grounded, the third end of the first T-type microstrip line is connected to one end of the second microstrip line, and the other end of the second microstrip line is connected to the DC isolation circuit.

6. The environmental monitoring circuit based on long-distance wireless power supply according to claim 4, characterized in that: The LC filtering circuit includes: a fourth microstrip line, a first inductor, a fifth microstrip line, a second T-type microstrip line, a sixth microstrip line, a third capacitor and a seventh microstrip line, wherein one end of the fourth microstrip line is connected to the third end of the cross-junction microstrip line, the other end of the fourth microstrip line is connected to one end of the first inductor, the other end of the first inductor is connected to one end of the fifth microstrip line, the other end of the fifth microstrip line is connected to the first end of the second T-type microstrip line, the second end of the second T-type microstrip line is connected to the positive terminal of the third capacitor, the negative terminal of the third capacitor is connected to the first end of the sixth microstrip line, the other end of the sixth microstrip line is grounded, the third end of the second T-type microstrip line is connected to one end of the seventh microstrip line, and the other end of the seventh microstrip line is connected to the power management circuit.

7. The environmental monitoring circuit based on long-distance wireless power supply according to claim 4, characterized in that: The rectifier diode circuit includes a first rectifier diode circuit and a second rectifier diode circuit, wherein: The first rectifier diode circuit includes a thirteenth microstrip line, a twelfth microstrip line, a first rectifier diode array, and an eleventh microstrip line, one end of the thirteenth microstrip line is grounded, and the other end is connected to one end of the twelfth microstrip line, the other end of the twelfth microstrip line is connected to the positive electrode of the first rectifier diode array, the cathode of the first rectifier diode array is connected to one end of the eleventh microstrip line, and the other end of the eleventh microstrip line is connected to the second end of the cross-junction microstrip line; The second rectifier diode circuit includes an eighth microstrip line, a ninth microstrip line, a second rectifier diode array, and a tenth microstrip line. One end of the eighth microstrip line is grounded, and the other end is connected to one end of the ninth microstrip line. The other end of the ninth microstrip line is connected to the positive electrode of the second rectifier diode array, the negative electrode of the second rectifier diode array is connected to one end of the tenth microstrip line, and the other end of the tenth microstrip line is connected to the second end of the cross-junction microstrip line.

8. The environmental monitoring circuit based on long-distance wireless power supply according to claim 7, characterized in that: The first rectifier diode circuit further includes a second tuning capacitor, a cathode of the second tuning capacitor is connected to a cathode of the first rectifier diode array, and a cathode of the second tuning capacitor is connected to a cathode of the first rectifier diode array.

9. An environmental monitoring system based on long-distance wireless power supply, characterized in that: include: A signal transmitting module, an environmental monitoring circuit based on long-distance wireless power supply and a user terminal as described in any one of claims 1 to 8; The first signal transmitting end of the signal transmitting module establishes remote communication with the first signal transmitting end of the environment monitoring circuit based on long-distance wireless power supply, and the signal transmitting module is used to generate a radio frequency signal and output the radio frequency signal to the environment monitoring circuit based on long-distance wireless power supply through remote communication; The second signal transmission end of the environment monitoring circuit based on long-distance wireless power supply is connected to the user end through remote communication; The environmental monitoring circuit based on long-distance wireless power supply is used to convert the radio frequency signal into a direct current power signal, to power the environmental monitoring circuit based on long-distance wireless power supply itself, and to collect temperature and humidity data at the same time. The second signal transmission end of the environmental monitoring circuit based on long-distance wireless power supply establishes remote communication with the user communication end of the user end, and sends the temperature and humidity data to the user end through the second signal transmission end; The user end is used to interact with the environmental monitoring circuit based on long-distance wireless power supply and display the temperature and humidity data to the user.

10. The environmental monitoring system based on long-distance wireless power supply according to claim 9, characterized in that: The user end includes: a second wireless communication circuit, a second control circuit and a host computer; The second wireless communication circuit is connected to the second signal transmission end of the environmental monitoring circuit based on long-distance wireless power supply, and is used to receive and send interactive information; when the second wireless communication circuit receives a signal sent by the environmental monitoring circuit based on long-distance wireless power supply, the interactive information is temperature and humidity data, and the second wireless communication circuit sends the temperature and humidity data to the second control circuit accordingly; when the second wireless communication circuit receives a signal sent by the second control circuit, the interactive information is a second feedback signal, and the second wireless communication circuit sends the second feedback signal to the environmental monitoring circuit based on long-distance wireless power supply accordingly; The second control circuit is connected to the host computer, and is used to output the temperature and humidity data to the host computer and receive a control signal sent by the user through the host computer; The host computer is provided with a user interface for receiving the temperature and humidity data sent by the second control circuit, displaying the temperature and humidity data to the user, and sending a control signal generated by user interaction to the second control circuit.

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