CN102938897B - Wireless charging node capable of monitoring signal strength in real time - Google Patents
Wireless charging node capable of monitoring signal strength in real time Download PDFInfo
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- CN102938897B CN102938897B CN201210455900.6A CN201210455900A CN102938897B CN 102938897 B CN102938897 B CN 102938897B CN 201210455900 A CN201210455900 A CN 201210455900A CN 102938897 B CN102938897 B CN 102938897B
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Abstract
The invention discloses a wireless charging node capable of monitoring signal strength in real time. The node is mainly composed of a printed circuit board (PCB) antenna, an energy conversion module, a microprocessor module, a signal strength monitoring module, a sensor module and a wireless radio frequency module. The PCB antenna is connected with the energy conversion module which is connected with the microprocessor module through a constant voltage sub-module, the signal strength monitoring module of the microprocessor module monitors the signal strength acquired by the energy conversion module in real time, and the microprocessor module is connected with the signal strength monitoring module and the sensor module through input-output (IO) ports and connected with the wireless radio frequency module through a serial peripheral interface (SPI). The sensor node cannot only perform wireless charging and acquisition and communication of information, but also monitor the signal strength in real time and manage energy. According to the wireless charging node capable of monitoring signal strength in real time, integrated chips are used, so that the product packaging is facilitated. Besides, the energy conversion ratio is high, usable power is large, and the sensor expansibility is good.
Description
Technical field
The present invention relates to a kind of radio-frequency (RF) energy of can collecting and carry out wireless charging and the novel wireless sensor node of pick-up transducers node data, especially designing one can Real-Time Monitoring signal strength signal intensity, can carry out energy management, improve the sensor node of the wireless charging of energy conversion rate.
Background technology
Along with the development of science and technology and the needs of industry, increasing wireless sensor network applies in productive life.But because number of nodes is huge, the random scatter of node, node place bad environments, node itself are embedded in solid structure, adopt traditional battery to power to node and can bring that battery altering difficulty is large, high in cost of production problem, the serious curtailment life cycle of node.In addition, because node energy is limited, energy management can not be carried out by Real-Time Monitoring energy, also can have a strong impact on the economize on electricity life-span.Adopt and collect radio-frequency (RF) energy and the method being converted into DC energy, the constraint of battery to node can be broken away from.Adopt the method for Real-Time Monitoring signal strength signal intensity simultaneously, can energy management be carried out, improve energy conversion efficiency, ensure the reliability of node work.
Summary of the invention
Need powered battery to overcome existing sensor node, the signal strength signal intensity caught in wireless charging process is unknown and energy conversion rate is low, exports the present situation that available horsepower is low, the invention provides a kind of wireless charging node of Real-Time Monitoring signal strength signal intensity.This sensor node not only can be carried out wireless charging and be sent by radio frequency chip by the various sensing datas gathered, simultaneously can the signal strength signal intensity that captures of Real-Time Monitoring, carry out energy management, energy conversion efficiency reaches 50%, export available horsepower and reach 15mw, substantially increase the reliability of node work, extend the life-span of node.
The technical solution adopted for the present invention to solve the technical problems:
A kind of sensor node of wireless charging of real-time signal strength monitoring.This node is primarily of PCB antenna, energy conversion module, microprocessor module, signal strength signal intensity monitoring modular, sensor assembly, wireless radio frequency modules composition; PCB antenna is connected with energy conversion module, energy conversion module is connected with microprocessor module by voltage stabilizing submodule, microprocessor module is connected with signal strength signal intensity monitoring modular by IO port, Real-Time Monitoring signal strength signal intensity, energy management is carried out to energy conversion module, put forward high-octane transfer ratio and utilance, microprocessor module is connected with sensor assembly by IO port, is connected with wireless radio frequency modules by SPI interface; This sensor node not only can carry out wireless charging, various sensing data can be gathered and sent by wireless radio frequency modules simultaneously, can also the signal strength signal intensity that captures of Real-Time Monitoring, energy conversion efficiency reaches 50%, exports available horsepower and reaches 15mw.
The present invention is received by printed board antenna, converted center frequency is the radio-frequency (RF) energy of 915MHz, energy conversion module converts the radio-frequency (RF) energy received to direct current signal, be stored in the storage capacitance of Large Copacity Low dark curient electric current, the direct voltage exported obtains galvanic current pressure through the voltage stabilizing chip rectification of low-power consumption, powers to whole node.Energy conversion module is connected with signal strength signal intensity monitoring modular and micro controller module, can be obtained the data of signal strength signal intensity, and carry out energy management by the analog voltage of Real-Time Monitoring energy conversion module, reduces energy consumption.The energy conversion rate of energy conversion module is high, and the utilisable energy obtained is high.Microcontroller utilizes universal I/O port to be connected with sensor assembly, and the IO mouth of microprocessor provides power supply to sensor assembly simultaneously, and read sensor node ID, microcontroller is connected with wireless radio frequency modules by SPI interface.
The microcontroller chip that this node adopts can select the PIC24F16KA102 of MICROCHIP company, but is not limited thereto.Wherein the 10th, 25 pins meet supply power voltage VDD, the power pins of the 6th pin connecting sensor, 7th, 8, 9 pins control energy conversion module, carry out the management of energy, 3rd, 27 pins carry out data processing by operational amplifier U4, Real-Time Monitoring signal strength signal intensity, 2nd, 4, 28 pins connect light intensity sensor as ADC analog input channel, the analog output of temperature sensor and humidity sensor, 7th, 8, 9 pins connect energy conversion module, 13rd, 14, 15 pins connect selector S1, the ID of read sensor, 16th, 18, 19, 21 pins are SPI interfaces of microcontroller, connect radio frequency chip U4, 17th, 22, 23 pins connect radio frequency chip U4.Communication is preserved autonomy.
Described radio frequency chip can adopt the MRF24J40MA of MICROCHIP, but is not limited thereto.10th voltage pin connects supply power voltage VDD, and the 5th, 6,7,8 pins connect the SPI interface of microcontroller, and the 2nd, 3,4 pins connect microcontroller.
Have employed temperature sensor in sensor assembly, humidity sensor, light intensity sensor, and employ connector, other transducer of easily extensible.
The beneficial effect that the present invention has is:
1, energy conversion module converts radio frequency signal to DC energy, has broken away from the dependence of conventional node to battery, and debugs its output voltage easily through the capacitance resistance of periphery and microcontroller chip.Adopt integrated chip to be convenient to produce sheet encapsulation, the signal strength signal intensity that microprocessor module real time monitoring energy conversion module is collected, carries out energy management, substantially increases the conversion efficiency of energy, ensures the reliably working of node.
2, microprocessor module can select suitable low-power consumption mode according to the result of energy management, effectively reduces whole node to the consumption of energy.
3, the signal strength signal intensity that receives of signal strength signal intensity monitoring modular real-time monitoring system, carries out energy management, puies forward high-octane transfer ratio and utilance, greatly strengthen available horsepower, extend the life-span of node.
4, sensor assembly flexibility is high, have employed outside connector, is convenient to expansion.
Accompanying drawing explanation
Fig. 1 is overall structure framework of the present invention;
Fig. 2 is program flow diagram of the present invention;
Fig. 3 is energy conversion module circuit theory diagrams of the present invention;
Fig. 4 is microprocessor module of the present invention and radio frequency modular circuit schematic diagram;
Fig. 5 is signal strength signal intensity monitoring modular circuit theory diagrams of the present invention;
Fig. 6 is sensor module circuitry schematic diagram of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
As shown in Figure 1, the overall structure composition of this novel joint is described: it forms primarily of PCB antenna, energy conversion module, microprocessor module, sensor assembly, wireless radio frequency modules and signal strength signal intensity monitoring modular.PCB antenna is connected with energy conversion module, and energy conversion module is that microprocessor module and wireless radio frequency modules are powered, and microprocessor module is connected with signal strength signal intensity monitoring modular with sensor assembly by IO port, is connected with wireless radio frequency modules by SPI interface.
PCB antenna is collected radio-frequency (RF) energy and is transferred in energy conversion module, energy conversion module converts the radiofrequency signal of input to direct current and is stored in bulky capacitor, the direct voltage exported is through the rectification of voltage stabilizing submodule, and the direct voltage of stable output, powers to whole node.By microprocessor module and signal strength signal intensity monitoring modular to the Real-Time Monitoring of the signal strength signal intensity that energy conversion module receives, can manage energy, put forward high-octane transfer ratio and utilance, maximize utilisable energy and Appropriate application.Microprocessor module is except monitor signal strength, also the data acquisition of sensor assembly is controlled, signal strength parameter that the temperature that sensor assembly collects by microprocessor module, light intensity, humidity parameter and signal strength signal intensity monitoring modular collect etc. processes, and sends to host computer also to communicate with host computer these data by wireless radio frequency modules.Microprocessor module is responsible for the control work of whole node.
As shown in Figure 2, the course of work of this system is described.When microcontroller monitors energy abundance, the data of pick-up transducers, the news that work of going forward side by side, after completing, time delay 10s, monitors energy again.
As shown in Figure 3, be the circuit diagram of energy conversion module.Energy conversion module forms primarily of antenna Antenna, power conversion chip U1, voltage stabilizing chip U2, variable resistor R1, R2, resistance R3-R5, electric capacity C1-C7, connector J1.Wherein U1 can select the P2110 chip of POWERCAST company, but is not limited thereto, and U2 can select the pressurizer NCP698SQ30 of ON Semiconductor company, is not limited thereto.Pin in analog (2 pin, 4 pin, the 11 pin) ground connection of power conversion chip U1, the radio frequency input pin (3 pin) of power conversion chip U1 connects with PCB antenna, analog input pin (5 pin of power conversion chip U1, DSET) be connected with one end of connector J1, the other end of connector J1 is connected with one end of resistance R3, the other end of resistance R3 is connected with direct voltage (12 pin) output pin of power conversion chip U1, reset input pin (7 pin) is also connected with one end of electric capacity C2, the other end ground connection of electric capacity C2, store voltages pin (8 pin) connects with one end of electric capacity C3, the other end ground connection of electric capacity C3, output voltage control pin (10 pin) is connected with one end of resistance R2 with variable resistor R1, the other end ground connection of variable resistor R2, the other end of variable resistor R1 and voltage output pin (12 pin of power conversion chip U1, VOUT), electric capacity C1, one end of resistance R4 connects, the other end ground connection of electric capacity C1, the other end of resistance R4 and one end of electric capacity C4, the input voltage pin (2 pin) of voltage stabilizing chip U2, enable pin (4 pin), one end of resistance R5 connects, the other end ground connection of electric capacity C4, the voltage of voltage regulation output pin (3 pin) of voltage stabilizing chip U2 connects with the other end of resistance R5, also connect with one end of electric capacity C5, the other end ground connection of C5, the direct voltage VDD of voltage of voltage regulation output pin (3 pin) stable output of voltage stabilizing chip.In energy conversion module, U1 changes the radiofrequency signal that radio frequency input pin (3 pin) inputs into direct current and is stored in electric capacity C3, the voltage output pin (12 pin) of power conversion chip U1 exports direct current, through the voltage stabilizing of voltage stabilizing chip, voltage of voltage regulation output pin (3 pin) the stable output voltage VDD of voltage stabilizing chip U2, powers to sensor node.
As shown in Figure 4, the circuit connection of micro treatment module and wireless radio frequency modules is described.Microprocessor module is primarily of microprocessor U3, diode D1, switch S 1, resistance R6, electric capacity C6, C7 form, wireless radio frequency modules forms primarily of radio frequency chip U5, resistance R18, wherein microprocessor U3 can select the PIC24F16KA102 chip of MICROCHIP company, but be not limited thereto, radio frequency chip U5 can select the MRF24J40MA chip of Microchip company, is not limited thereto.(5 pin of pin in analog of the U3 of microprocessor, 24 pin) difference ground connection, the 7th pin of microprocessor U3 and the analog input pin (5 pin, DSET) of energy collection module U1 are connected, and the 8th pin of microprocessor U3 is connected with the reset pin (7 pin) of energy collection module U1, 9th pin of microprocessor U3 is connected with the interrupting input pin (6 pin) of energy collection module U1, power pins (10 pin of microprocessor U3, 25 pin) input burning voltage VDD, and be connected with one end of electric capacity C7, the other end ground connection of electric capacity C7, I/O pin (13 pin of microprocessor U3, 14 pin, 15 pin) respectively at the 1st of switch S 1, 2, 3 pins are connected, 4 of S1, 5, 6 pins are ground connection respectively, SPI pin (16 pin of the U3 of microprocessor, 21 pin, 18 pin, 19 pin) respectively with the 8th of radio frequency chip U5, 5, 7, 6 pins are connected, and the interrupt pin (22 pin) of the U3 of microprocessor is connected with the 4th pin of radio frequency chip U5, the 17th pin of the U3 of microprocessor, 23rd pin respectively with the 2nd pin of radio frequency chip U5, 3rd pin is connected, the I/O pin (2 pin) of radio frequency chip U5 connects with one end of resistance R18, the other end ground connection of resistance R18, the removing input pin (26 pin) of the U3 of microprocessor is connected with the negative terminal of diode D1, the anode of diode D1 and resistance R6, one end of electric capacity C6 is connected, and the other end of resistance R6 is connected with VDD, the other end ground connection of electric capacity C6.Microprocessor chip is the core of whole node, control the work of whole node: the monitoring of energy and management, the collection of node data, the process of data and by radio frequency chip by data transmit-receive, wherein switch S 1 can the ID of setting wireless sensor node.
As shown in Figure 5, be the circuit theory diagrams of signal strength signal intensity monitoring modular.Signal strength signal intensity monitoring modular forms primarily of operational amplifier U4, field effect transistor Q1-Q2, resistance R7-R17, electric capacity C8-C10, wherein operational amplifier U4 can select the MCP6L04 of MICROCHIP company, but be not limited thereto, field effect transistor Q1, Q2 can select the NTA4153N chip of ON Semiconductor company, are not limited thereto.In signal strength signal intensity monitoring modular, the positive bias pin (4 pin) of operational amplifier U4 is connected with VDD, first output pin (1 pin) of operational amplifier U4 and the second positive input pin (5 pin) of operational amplifier U4, one end of resistance R11 is connected, the other end of resistance R11 and resistance R10, the first negative input pin (2 pin) one end of operational amplifier U4 is connected, and the other end of resistance R10 is connected with one end of resistance R9 with electric capacity C8, the first positive input pin (3 pin) of operational amplifier U4, negative bias pin (11 pin) and resistance R8, R9, R12, R15, electric capacity C9, C10, grid (3 pin) one end of field effect transistor Q2 is connected, the other end of resistance R8 and electric capacity C8, the source electrode (2 pin) of field effect transistor Q1, resistance R7, the 27th pin one end of microprocessor chip U3 is connected, modulating output pin (13 pin of the other end of resistance R7 and the grid (3 pin) of field effect transistor Q1 and power conversion chip U1, DOUT) one end is connected, the gate pole (1 pin) of field effect transistor Q2 and the gate pole (1 pin) of field effect transistor Q1, analog input (5 pin, DSET) one end of power conversion chip U1 is connected, source electrode (2 pin) ground connection of field effect Q2, the other end of resistance R12 and the second negative input pin (6 pin) of operational amplifier U4, one end of resistance R13 is connected, and the other end of resistance R13 and second of operational amplifier U4 exports (7 pin), one end of resistance R16 is connected, the other end of resistance R15 and the 3rd negative input pin (10 pin) of operational amplifier U4, one end of resistance R14 is connected, and the resistance R14 other end is connected with power vd D, electric capacity C9, the other end of C10 meets VDD respectively, the other end of resistance R16 and the 3rd positive input pin (9 pin) of operational amplifier U4, one end of resistance R17 is connected, the other end of resistance R17 and the 3rd output pin (8 pin) of operational amplifier U4, 3rd pin of microprocessor U3 is connected.Modulating output pin (13 pin to U1 in energy conversion module can be carried out by control DSET pin in signal strength signal intensity monitoring modular, DOUT) and the signal of the 27th pin of microprocessor module U3 carry out demodulation amplification, the 3rd of operational amplifier U4 exports (8 pin) through demodulation amplifying signal to the 3rd pin of microprocessor module U3, realize the Real-Time Monitoring of signal strength signal intensity, this utilizes energy management and provides a great convenience, and substantially increases transfer ratio and the utilance of energy.
As shown in Figure 6, be the circuit theory diagrams of sensor assembly.Sensor assembly mainly contains temperature sensor, humidity sensor, light intensity sensor and extension sensor, sensor voltage controls composition.Temperature sensor forms primarily of temperature sensor R20, resistance R19, electric capacity C12, and wherein temperature sensor R20 can select the NCP18XH103F03RB thermistor of Murata company but be not limited thereto.Temperature sensor R20 is connected with one end of the 4th pin of resistance R19, electric capacity C12, microprocessor U3, and the other end of resistance R19 is connected with the 2nd pin of connector J2, the other end ground connection respectively of temperature sensor R20 and electric capacity C12.Humidity sensor is primarily of humidity sensor U6, resistance R21, electric capacity C13, C14 composition, and wherein humidity sensor U6 can select the HIH-5030 chip of Honeywell company, but is not limited thereto.Negative input pin (1 pin) ground connection of humidity sensor U6 in humidity sensor submodule, the humidity output pin (3 pin) of humidity sensor U6 is connected with one end of the 28th pin of resistance R21, electric capacity C14, microcontroller U3, the other end ground connection respectively of resistance R21 and electric capacity C14, the positive input pin (3 pin) of humidity sensor U6 connects with the 6th pin of electric capacity C13, connector J2, the other end ground connection of electric capacity C13.Light intensity sensor forms primarily of light intensity sensor U7, resistance R22, electric capacity C15, wherein light intensity sensor U7 can select the TEMT6000X01 of Vishay company, but be not limited thereto, the light intensity output pin (1 pin) of light intensity sensor U7 is connected with one end of microprocessor the 2nd pin, electric capacity C15, resistance R22, the other end ground connection of electric capacity C15, the other end of resistance R22 is connected with the 4th pin of connector J2, ground pin (3 pin) ground connection of light intensity sensor.Extension sensor forms primarily of connector J3 and electric capacity C16, wherein the 1st pin of connector J3 is connected with the 8th pin of connector J2,2nd pin of connector J3 is connected with the 1st pin of the U3 of microprocessor module, one end of electric capacity C16, the other end ground connection of electric capacity C16, the 3rd pin ground connection of connector J3.Sensor electrical pressure-controlled is primarily of connector J2, field effect transistor Q3, and resistance R23, electric capacity C11 form, and its chips field effect transistor Q3 can select the NTA4151PT1G chip of ON Semiconductor company, but is not limited thereto.Connector J2 the 1st, 3,5,7 pins are connected with the 3rd pin one end of electric capacity C11, field effect transistor Q3, the other end ground connection of electric capacity C11, field effect transistor Q3 the 2nd pin is connected with VDD, field effect transistor Q3 the 1st pin connects with one end of resistance R23, microprocessor U3 the 6th pin, another termination VDD of resistance R23.By connector J2 can control temperature, humidity, light intensity sensor choice for use, wherein connector J3 is the expansion for transducer, flexibly and easily.
Above-described embodiment is used for explaining and the present invention is described, instead of limits the invention, and in the protection range that spirit of the present invention and right are asked, any amendment make the present invention and change, all fall into protection scope of the present invention.
Claims (1)
1. a sensor node for the wireless charging of real-time signal strength monitoring, is characterized in that: this node forms primarily of PCB antenna, energy conversion module, microprocessor module, sensor assembly, wireless radio frequency modules and signal strength signal intensity monitoring modular, wherein, described PCB antenna is connected with energy conversion module, energy conversion module is that microprocessor module and wireless radio frequency modules are powered, and microprocessor module is connected with signal strength signal intensity monitoring modular with sensor assembly by IO port, is connected with wireless radio frequency modules by SPI interface, described energy conversion module forms primarily of antenna, power conversion chip U1, voltage stabilizing chip U2, variable resistor R1-R2, resistance R3-R5, electric capacity C1-C7 and connector J1, wherein, the ground connection of pin in analog of power conversion chip U1, radio frequency input pin connects with PCB antenna, analog input pin is connected with connector J1 one end, direct voltage output pin is connected with one end of resistance R3, reset input pin is connected with one end of electric capacity C2, store voltages pin connects with electric capacity C3, output voltage control pin is connected with R2 one end with variable resistor R1 respectively, and the voltage output pin of power conversion chip U1 connects with the other end of variable resistor R1, one end of electric capacity C1, resistance R4 one end respectively, the other end of connector J1 is connected with the other end of resistance R3, the other end of the other end of electric capacity C1, the other end of electric capacity C2, electric capacity C3, the equal ground connection of the other end of variable resistor R2, the input voltage pin of voltage stabilizing chip U2 and the other end of enable pin and resistance R4, one end of electric capacity C4, one end of resistance R5 link together, and the voltage of voltage regulation output pin of voltage stabilizing chip U2 connects with one end of electric capacity C5 and the other end of resistance R5 respectively, the equal ground connection of the other end of electric capacity C4 and electric capacity C5, the direct voltage VDD of the voltage of voltage regulation output pin stable output of voltage stabilizing chip U2, described signal strength signal intensity monitoring modular forms primarily of operational amplifier U4, field effect transistor Q1-Q2, resistance R7-R17 and electric capacity C8-C10, wherein, the positive bias pin of operational amplifier U4 is connected with the voltage of voltage regulation output pin of voltage stabilizing chip U2, first output pin of operational amplifier U4 is all connected with one end of resistance R11 with the second positive input pin, the first negative input pin of operational amplifier U4 is connected with one end of resistance R10 with the other end of resistance R11 respectively, the other end of resistance R10 is connected with one end of resistance R9 with one end of electric capacity C8 respectively, the first positive input pin of operational amplifier U4 and negative bias pin and resistance R8, R9, R12, R15, electric capacity C9, C10, one end of the grid of field effect transistor Q2 is connected, the other end of resistance R8 and electric capacity C8, the source electrode of field effect transistor Q1, resistance R7, the 27th pin one end of microprocessor chip U3 is connected, the other end of resistance R7 is connected with the grid of field effect transistor Q1 one end with the modulating output pin of power conversion chip U1, the gate pole of field effect transistor Q2 is connected with the analog input pin of the gate pole of field effect transistor Q1 with power conversion chip U1, the source ground of field effect transistor Q2, the other end of resistance R12 and the second negative input pin of operational amplifier U4, resistance R13 one end is connected, the other end of resistance R13 and second output pin of operational amplifier U4, resistance R16 one end is connected, the other end of resistance R15 and the 3rd negative input pin of operational amplifier U4, resistance R14 one end is connected, the resistance R14 other end is connected with the voltage of voltage regulation output pin of voltage stabilizing chip U2, the other end of electric capacity C9 and electric capacity C10 connects the voltage of voltage regulation output pin of voltage stabilizing chip U2 respectively, the other end of resistance R16 and the 3rd positive input pin of operational amplifier U4, one end of resistance R17 is connected, the other end of resistance R17 and the 3rd output pin of operational amplifier U4, the I/O pin of microprocessor U3 is connected.
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| CN103750826A (en) | 2013-12-25 | 2014-04-30 | 杨松 | Wireless passive temperature measurement method, system and device for forming system |
| CN104096361A (en) * | 2014-07-08 | 2014-10-15 | 苏州乐聚一堂电子科技有限公司 | Intelligent wireless sensing control system |
| CN105186719B (en) * | 2015-10-21 | 2018-02-09 | 浙江大学 | Wireless structural health monitoring node based on RF energy collection |
| CN105318823A (en) * | 2015-11-03 | 2016-02-10 | 浙江大学 | Ultra-low power consumption passive structural strain monitoring device |
| CN107152274A (en) * | 2016-03-02 | 2017-09-12 | 中国石油化工股份有限公司 | The storage method and microstorage of well logging data |
| CN105958670B (en) * | 2016-05-31 | 2019-09-20 | 宁波微能物联科技有限公司 | For the RF energy acquisition device of wireless sensing node power supply and the working method of wireless sensing node |
| CN109479016A (en) * | 2016-12-06 | 2019-03-15 | 华为技术有限公司 | Beam selection system, trunking method and equipment |
| CN106772227B (en) * | 2017-01-12 | 2019-04-12 | 浙江大学 | A kind of unmanned plane direction determining method based on the identification of vocal print multiple-harmonic |
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| CN101902062A (en) * | 2010-08-06 | 2010-12-01 | 武汉中原电子集团有限公司 | Vehicle-mounted wireless charging device |
| CN102005828A (en) * | 2010-11-30 | 2011-04-06 | 电子科技大学 | Wireless sensor network node wireless charging system and method based on time reflection |
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