CN103872797A - Passive Wi-Fi prompting paster - Google Patents
Passive Wi-Fi prompting paster Download PDFInfo
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- CN103872797A CN103872797A CN201410111685.7A CN201410111685A CN103872797A CN 103872797 A CN103872797 A CN 103872797A CN 201410111685 A CN201410111685 A CN 201410111685A CN 103872797 A CN103872797 A CN 103872797A
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Abstract
The invention relates to a passive Wi-Fi prompting paster, and relates to the field of design and manufacturing of integrated circuits. The passive Wi-Fi prompting paster is used for being pasted at a striking position in public so as to prompt intensity and availability of Wi-Fi signals. Part of magnetic force lines of a Wi-Fi magnetic field penetrate through a coil of the passive Wi-Fi prompting paster. Off-chip antenna coil inductance and on-chip capacitance generate resonance, a voltage is produced on an antenna coil, and the coil can sense different voltages according to different types of Wi-Fi intensity. The voltage can be used as a power source of a digital logic portion and LED indication lamps after being rectified and limited. Meanwhile, the direct-current voltage which comes out of a rectifier and is provided with certain ripples is converted into a corresponding voltage value through an ADC. Clock signals of the digital logic portion are produced by an OSC at the analog front end. Powering-on reset signals produced by the analog front end after the power source is stable enable the digital logic portion to be reset, the digital logic portion controls turning-on of the LED lamps according to the voltage value, and therefore the intensity and the availability of the Wi-Fi signals are prompted.
Description
Invention field
The present invention relates to the design and manufacture field of integrated circuit, more specifically, the present invention relates generally to a kind of Wi-Fi prompting label, for being attached to power and the availability thereof of public place full position prompting Wi-Fi signal.
Background technology
Wi-Fi (WirelessFidelity) claim again 802.11b standard, is that one can be terminals such as notebook computer, panel computer, mobile phones with the interconnected technology of wireless mode.Wi-Fi improves the interoperability between the radio network product based on IEEE802.11 standard.This utilization be near frequency range 2.4GHz, this frequency range also belongs to the radio band of license useless at present.
The advantage that Wi-Fi technology is outstanding is:
The first, the wide coverage of radio wave, radius can reach 100 meters of left and right, can use in office, also can Zheng Dong building in, an even larger panel region is used.
The second, transmission speed is very fast, can reach 11Mbps, meets the demand of individual and social informatization.
Three, manufacturer to enter the threshold in this field lower.Need not expend substantial contribution and carry out network layout, as long as AT STATION, the place of personnel's comparatively dense such as airport, campus, library arranges " focus ", by high-speed line, internet is accessed to these places, user is as long as take notebook computer, panel computer, the mobile phone of supporting WLAN in this region, can enter the Internet at a high speed, thereby save a large amount of costs.
Just because of above outstanding advantage, it is very wide that Wi-Fi applies now.The equipment such as various notebook computers, panel computer, mobile phone are all with Wi-Fi function, and they can search for Wi-Fi signal, and show the intensity of corresponding Wi-Fi signal.In public places, also do not have at present a kind of succinct especially for showing the small, dedicated equipment of Wi-Fi signal strength signal intensity.
Summary of the invention
The object of the invention is to propose a kind of passive Wi-Fi prompting label, this prompting label does not need the external world that power supply is provided, and can produce voltage by autonomous induction Wi-Fi signal power supply is provided; Except coil antenna with for showing that, the LED lamp of Wi-Fi intensity, remaining circuit is all integrated on chip piece, simple for structure small and exquisite, easy for installation.
For achieving the above object, the technical solution used in the present invention is a kind of passive Wi-Fi prompting label, and this passive Wi-Fi prompting label comprises prompting label chip internal and prompting label chip exterior; Described prompting label chip internal comprises AFE (analog front end) part and Digital Logic part; Chip exterior comprises induction coil and LED light.
Below this passive Wi-Fi prompting label is elaborated.
Prompting label chip internal comprises AFE (analog front end) part and Digital Logic part, and wherein AFE (analog front end) part comprises power generation module, electrification reset module, data acquisition module, clock generating module;
The power generation module of described AFE (analog front end) comprises radio frequency interface, rectifier, amplitude limiter, band-gap reference; Completing obtaining of outside Wi-Fi signal energy, provide power supply, power-on reset signal, magnitude of voltage and clock to Digital Logic part, is LED light power supply.
Radio frequency interface is connected with the rectifier of the power generation module of described AFE (analog front end); Radio frequency interface obtains outside Wi-Fi signal energy by antenna-coupled, and this signal to rectifier.The outside Wi-Fi signal energy that rectifier received RF interface obtains, produces the direct voltage with certain ripple, exports to amplitude limiter and data acquisition module.Amplitude limiter receives the voltage of rectifier output, under band-gap reference provides certain reference voltage, produces galvanic current and presses as chip power supply.
When Wi-Fi prompting label is during near outside Wi-Fi signal, electric capacity generation resonance in sheet external inductance and sheet, transfers to Wi-Fi signal energy the resistive load of Wi-Fi prompting label chip internal.Sheet external inductance two ends be 2.4GHz sinusoidal alternating voltage, voltage signal produces the direct voltage with certain ripple after rectifier rectification, this voltage can drop on accurately in the very little scope of variation after amplitude limiter, and can not change with the variation of outside Wi-Fi signal energy intensity, band-gap reference (Bandgap) provides certain reference voltage for amplitude limiter, electrification reset module.
Described electrification reset module comprises comparator and delay cell, "+" end of comparator is connected with the supply voltage of the power generation module output of described AFE (analog front end), "-" end is connected with the band-gap reference of the power generation module of described AFE (analog front end), comparator output connection delay unit, exports power-on reset signal to Digital Logic part through delay cell.
At the beginning of Wi-Fi prompting label chip power, the state of Wi-Fi prompting label chip numeral logical gate internal register is uncertain.Wi-Fi prompting label chip analog front, after power supply is stable, produces power-on reset signal Digital Logic part is reset.
Described data acquisition module is an analog to digital converter ADC, for analog voltage signal is changed into digital voltage signal.
In the present invention, when outside Wi-Fi change in signal strength, in the power generation module of Wi-Fi prompting label chip, alternating voltage is converted to the direct voltage with certain ripple by rectifier, the direct voltage of this size variation is connected on to the input end of analog signal of ADC, digital signal output end is exported the numerical value of the direct voltage of this size variation.
Described clock generating module is a low-power consumption oscillator OSC, provides power supply by the power generation module of described AFE (analog front end), and clock signal is to Digital Logic part.
The Digital Logic part of prompting label chip internal is a MCUcore, and its major function is to control the light on and off number of each LED, reacts power and the availability thereof of Wi-Fi prompting label present position Wi-Fi signal with this.
The direct voltage with certain ripple of being exported by rectifier in Wi-Fi prompting label chip analog front, after ADC, obtains 4 bit values, represents this size with the direct voltage of certain ripple; This 4 bit data is connected on respectively on 4 GPIO of MCUcore; The supply voltage, power-on reset signal, the clock signal that provide by Wi-Fi prompting label chip analog front, MCUcore starts working, its internal processes is processed accordingly, control the output of other 5 GPIO, and then the light on and off of 5 LED of control, power and the availability thereof of demonstration Wi-Fi signal.
Described chip exterior induction coil L is parallel to chip internal capacitor C two ends, composition LC resonant tank.When Wi-Fi prompting label is during near outside Wi-Fi signal, LC resonant tank is transferred to Wi-Fi signal energy in the rectifier of the power generation module of described AFE (analog front end).
The LED light of described chip exterior is used for showing power and the availability thereof of Wi-Fi signal.5 LED light positive poles all connect the voltage of the amplitude limiter output of the power generation module of described AFE (analog front end), and negative pole is connected respectively on 5 GPIO of MCUcore.In the time that the GPIO of the MCUcore being connected with certain LED light is low level, this LED light is bright, otherwise this LED light is gone out.
The shell of this Wi-Fi prompting label is a square plastic card, and chip and sheet exterior loop are encapsulated in card inside, draw 5 wires from card inside, connects outside 5 LED light, and 5 LED light are equidistantly neatly fixed on card by a line; The mode that this Wi-Fi prompting label is fixed on public arena is very simple, and there is glue at the back side of Wi-Fi prompting label, chooses behind suitable installation site, directly it is sticked just.
Compared with prior art, the present invention has following beneficial effect.
1. this Wi-Fi prompting label is passive, does not need the external world that power supply is provided, and can produce voltage by autonomous induction Wi-Fi signal power supply is provided.
2. this Wi-Fi prompting loses money in a business except coil antenna with for showing the LED light of Wi-Fi intensity, and remaining circuit is all integrated on chip piece, simple for structure small and exquisite, easy for installation.
Brief description of the drawings
Fig. 1 simulation front-end interface schematic diagram.
Fig. 2 AFE (analog front end) system configuration.
Fig. 3 power generation module diagram.
Fig. 4 Digital Logic interface schematic diagram.
Embodiment
Be further described for the present invention below in conjunction with the drawings and specific embodiments.
In the present invention, be to be completed by the AFE (analog front end) of Wi-Fi prompting label with the direct interaction of outside Wi-Fi signal, AFE (analog front end) part need to complete obtaining of outside Wi-Fi signal energy.For the Digital Logic part of Wi-Fi prompting label chip internal, the effect of AFE (analog front end) is to provide power supply, power-on reset signal, magnitude of voltage and clock to Digital Logic part.Be illustrated in figure 1 Wi-Fi prompting label simulation front-end interface schematic diagram, the interface of AFE (analog front end) and outside Wi-Fi signal is induction coil, and the interface of AFE (analog front end) and numerical portion has power supply, electrification reset, magnitude of voltage and clock.
As shown in Figure 2, in the present invention, AFE (analog front end) is mainly made up of four functional modules: power generation module, electrification reset module, data acquisition module and clock signal generating module.
Wi-Fi prompting label chip obtains energy by electromagnetic field couples.The interface of AFE (analog front end) and outside Wi-Fi signal is sheet exterior loop, outside Wi-Fi signal is space alternating electromagnetic field, after coil coupling, change alternating voltage into, through rectifier, alternating voltage is converted to the direct voltage with certain ripple, and by amplitude limiter, voltage is limited to specific value and offers other modules of Wi-Fi prompting label as power supply.
As shown in Figure 3, be power generation module diagram, power generation module comprises radio frequency interface, rectifier, amplitude limiter and band-gap reference.Radio frequency interface obtains outside Wi-Fi signal energy, and this signal to rectifier.The outside Wi-Fi signal energy that rectifier received RF interface obtains, produces the direct voltage with certain ripple, exports to amplitude limiter and data acquisition module.Amplitude limiter receives the voltage of rectifier output, under band-gap reference provides certain reference voltage, produces galvanic current and presses as chip power supply.
Described in described radio frequency interface, the rectifier of the power generation module of AFE (analog front end) is connected; Radio frequency interface from Wi-Fi signal acquisition energy, is transferred to other circuit of Wi-Fi prompting label chip internal and LED light power supply by inner LC resonant tank by energy by antenna-coupled.
Wi-Fi prompting label provides power supply by the energy in electromagnetic induction coupled room for other circuit of Wi-Fi prompting label, and the voltage at coil two ends is AC signal, carries out AC-DC conversion by rectifier, produces direct voltage.
The voltage swing of the DC power supply that Wi-Fi prompting label rectifier produces is relevant with the size of voltage on coil, and more strong voltage is larger for space W i-Fi signal.If Wi-Fi signal strength signal intensity is stronger, the energy that the power consumption of Wi-Fi prompting label chip internal circuit is not enough to coil to absorb consumes, and the voltage on coil will raise, and this will cause Wi-Fi prompting label supply voltage too high, and device burns out.So, introduce amplitude limiter the excess energy of Wi-Fi prompting label coil absorption discharged, and Wi-Fi prompting label supply voltage is stabilized in the value needing.
In the present invention, produce the stable reference voltage not changing with flow-route and temperature with band-gap reference (Bandgap), for amplitude limiter, electrification reset module provide certain benchmark.
Reset module comprises comparator and delay cell, "+" end of comparator is connected with the supply voltage of the power generation module output of described AFE (analog front end), "-" end is connected with the band-gap reference of the power generation module of described AFE (analog front end), comparator output connection delay unit, exports power-on reset signal to Digital Logic part through delay cell.
At the beginning of Wi-Fi prompting label chip power, the state of Digital Logic partial interior register is uncertain, and Wi-Fi prompting label AFE (analog front end) produces power-on reset signal after power supply is stable resets Digital Logic part.
Data acquisition module is an analog to digital converter ADC, for analog voltage signal is changed into digital voltage signal.
Wi-Fi prompting label chip obtains energy by electromagnetic field couples.The interface of Wi-Fi prompting label AFE (analog front end) and outside Wi-Fi signal is sheet exterior loop, outside Wi-Fi signal is space alternating electromagnetic field, after coil coupling, change alternating voltage into, through rectifier, alternating voltage is converted to the direct voltage with certain ripple, this direct voltage is connected on to the input end of analog signal of ADC, digital signal output end is exported the numerical value of this direct voltage.
Clock generating module is a low-power consumption oscillator OSC, provides power supply by the power generation module of described AFE (analog front end), and clock signal is to Digital Logic part.
As shown in Figure 4, be Digital Logic interface schematic diagram.The power supply of MCUcore is provided by Wi-Fi prompting label AFE (analog front end).The required clock signal of MCUcore is produced by the oscillator OSC of Wi-Fi prompting label AFE (analog front end).At the beginning of Wi-Fi prompting label chip power, the state of MCUcore internal register is uncertain, and the reset signal that AFE (analog front end) produces after power supply is stable is reset numerical portion, and MCUcore starts working.According to the digital quantity d3d2d1d0 of ADC output, MCUcore internal processes carries out respective handling:
A. in the time that d3d2d1d0 is 0000～1010, GPIO1～5 are all 1, and all LED go out, and represent that Wi-Fi prompting label present position does not have Wi-Fi signal, or a little less than Wi-Fi pickup electrode, Wi-Fi are without availability;
B. in the time that d3d2d1d0 is 1011, GPIO1 is that 0, GPIO2～5 are all that 1, LED1 is bright, and all the other LED go out, and represents that there is Wi-Fi signal Wi-Fi prompting label present position, and a little less than Wi-Fi signal, Wi-Fi may have availability;
C. in the time that d3d2d1d0 is 1100, GPIO1, GPIO2 are that 0, GPIO3～5 are all that 1, LED1, LED2 are bright, and all the other LED go out, and represent that there is Wi-Fi signal Wi-Fi prompting label present position, and Wi-Fi signal is general, and Wi-Fi has availability;
D. in the time that d3d2～d0 is 1101, GPIO1, GPIO2, GPIO3 are that 0, GPIO4～5 are all that 1, LED1, LED2, LED3 are bright, and all the other LED go out, and represent that there is Wi-Fi signal Wi-Fi prompting label present position, and Wi-Fi signal is stronger, and Wi-Fi has better availability;
E. in the time that d3d2d1d0 is 1110, GPIO1, GPIO2, GPIO3, GPIO4 are that 0, GPIO5 is 1, LED1, LED2, LED3, LED4 are bright, and all the other LED go out, and represent that there is Wi-Fi signal Wi-Fi prompting label present position, Wi-Fi signal is strong, and Wi-Fi has fine availability;
F. in the time that d3d2d1d0 is 1111, GPIO1～5 are all 0, and all LED are bright, and all the other LED go out, and represent that there is Wi-Fi signal Wi-Fi prompting label present position, and Wi-Fi signal is very strong, and Wi-Fi has particularly preferred availability.
Claims (5)
1. a passive Wi-Fi prompting label, is characterized in that: this passive Wi-Fi prompting label comprises prompting label chip internal and prompting label chip exterior; Described prompting label chip internal comprises AFE (analog front end) part and Digital Logic part; Chip exterior comprises induction coil and LED light;
Prompting label chip internal comprises AFE (analog front end) part and Digital Logic part, and wherein AFE (analog front end) part comprises power generation module, electrification reset module, data acquisition module, clock generating module;
The power generation module of described AFE (analog front end) comprises radio frequency interface, rectifier, amplitude limiter, band-gap reference; Completing obtaining of outside Wi-Fi signal energy, provide power supply, power-on reset signal, magnitude of voltage and clock to Digital Logic part, is LED light power supply;
Radio frequency interface is connected with the rectifier of the power generation module of described AFE (analog front end); Radio frequency interface obtains outside Wi-Fi signal energy by antenna-coupled, and this signal to rectifier; The outside Wi-Fi signal energy that rectifier received RF interface obtains, produces the direct voltage with certain ripple, exports to amplitude limiter and data acquisition module; Amplitude limiter receives the voltage of rectifier output, under band-gap reference provides certain reference voltage, produces galvanic current and presses as chip power supply;
When Wi-Fi prompting label is during near outside Wi-Fi signal, electric capacity generation resonance in sheet external inductance and sheet, transfers to Wi-Fi signal energy the resistive load of Wi-Fi prompting label chip internal; Sheet external inductance two ends be 2.4GHz sinusoidal alternating voltage, voltage signal produces the direct voltage with certain ripple after rectifier rectification, this voltage can drop on accurately in the very little scope of variation after amplitude limiter, and can not change with the variation of outside Wi-Fi signal energy intensity, band-gap reference provides certain reference voltage for amplitude limiter, electrification reset module;
Described electrification reset module comprises comparator and delay cell, "+" end of comparator is connected with the supply voltage of the power generation module output of described AFE (analog front end), "-" end is connected with the band-gap reference of the power generation module of described AFE (analog front end), comparator output connection delay unit, exports power-on reset signal to Digital Logic part through delay cell;
At the beginning of Wi-Fi prompting label chip power, the state of Wi-Fi prompting label chip numeral logical gate internal register is uncertain; Wi-Fi prompting label chip analog front, after power supply is stable, produces power-on reset signal Digital Logic part is reset;
Described data acquisition module is an analog to digital converter ADC, for analog voltage signal is changed into digital voltage signal.
2. the passive Wi-Fi prompting label of one according to claim 1, it is characterized in that: when outside Wi-Fi change in signal strength, in the power generation module of Wi-Fi prompting label chip, alternating voltage is converted to the direct voltage with certain ripple by rectifier, the direct voltage of this size variation is connected on to the input end of analog signal of ADC, digital signal output end is exported the size of the direct voltage of this size variation;
Described clock generating module is a low-power consumption oscillator OSC, provides power supply by the power generation module of described AFE (analog front end), and clock signal is to Digital Logic part;
The Digital Logic part of prompting label chip internal is a MCUcore, and its major function is to control the light on and off number of each LED, reacts power and the availability thereof of Wi-Fi prompting label present position Wi-Fi signal with this;
The direct voltage with certain ripple of being exported by rectifier in Wi-Fi prompting label chip analog front, after ADC, obtains 4 bit values, represents this size with the direct voltage of certain ripple; This 4 bit data is connected on respectively on 4 GPIO of MCUcore; The supply voltage, power-on reset signal, the clock signal that provide by Wi-Fi prompting label chip analog front, MCUcore starts working, its internal processes is processed accordingly, control the output of other 5 GPIO, and then the light on and off of 5 LED of control, power and the availability thereof of demonstration Wi-Fi signal.
3. the passive Wi-Fi prompting label of one according to claim 1, is characterized in that: described chip exterior induction coil L is parallel to chip internal capacitor C two ends, composition LC resonant tank; When Wi-Fi prompting label is during near outside Wi-Fi signal, LC resonant tank is transferred to Wi-Fi signal energy in the rectifier of the power generation module of described AFE (analog front end);
The LED light of described chip exterior is used for showing power and the availability thereof of Wi-Fi signal; 5 LED light positive poles all connect the voltage of the amplitude limiter output of the power generation module of described AFE (analog front end), and negative pole is connected respectively on 5 GPIO of MCUcore; In the time that the GPIO of the MCUcore being connected with certain LED light is low level, this LED light is bright, otherwise this LED light is gone out.
4. the passive Wi-Fi prompting label of one according to claim 1, it is characterized in that: the shell of this Wi-Fi prompting label is a square plastic card, chip and sheet exterior loop are encapsulated in card inside, draw 5 wires from card inside, connect outside 5 LED light, 5 LED light are equidistantly neatly fixed on card by a line; The mode that this Wi-Fi prompting label is fixed on public arena is very simple, and there is glue at the back side of Wi-Fi prompting label, chooses behind suitable installation site, directly it is sticked just.
5. the passive Wi-Fi prompting label of one according to claim 1, is characterized in that: the power supply of MCUcore is provided by Wi-Fi prompting label AFE (analog front end); The required clock signal of MCUcore is produced by the oscillator OSC of Wi-Fi prompting label AFE (analog front end); At the beginning of Wi-Fi prompting label chip power, the state of MCUcore internal register is uncertain, and the reset signal that AFE (analog front end) produces after power supply is stable is reset numerical portion, and MCUcore starts working; According to the digital quantity d3d2d1d0 of ADC output, MCUcore internal processes carries out respective handling:
A. in the time that d3d2d1d0 is 0000～1010, GPIO1～5 are all 1, and all LED go out, and represent that Wi-Fi prompting label present position does not have Wi-Fi signal, or a little less than Wi-Fi pickup electrode, Wi-Fi are without availability;
B. in the time that d3d2d1d0 is 1011, GPIO1 is that 0, GPIO2～5 are all that 1, LED1 is bright, and all the other LED go out, and represents that there is Wi-Fi signal Wi-Fi prompting label present position, and a little less than Wi-Fi signal, Wi-Fi may have availability;
C. in the time that d3d2d1d0 is 1100, GPIO1, GPIO2 are that 0, GPIO3～5 are all that 1, LED1, LED2 are bright, and all the other LED go out, and represent that there is Wi-Fi signal Wi-Fi prompting label present position, and Wi-Fi signal is general, and Wi-Fi has availability;
D. in the time that d3d2～d0 is 1101, GPIO1, GPIO2, GPIO3 are that 0, GPIO4～5 are all that 1, LED1, LED2, LED3 are bright, and all the other LED go out, and represent that there is Wi-Fi signal Wi-Fi prompting label present position, and Wi-Fi signal is stronger, and Wi-Fi has better availability;
E. in the time that d3d2d1d0 is 1110, GPIO1, GPIO2, GPIO3, GPIO4 are that 0, GPIO5 is 1, LED1, LED2, LED3, LED4 are bright, and all the other LED go out, and represent that there is Wi-Fi signal Wi-Fi prompting label present position, Wi-Fi signal is strong, and Wi-Fi has fine availability;
F. in the time that d3d2d1d0 is 1111, GPIO1～5 are all 0, and all LED are bright, and all the other LED go out, and represent that there is Wi-Fi signal Wi-Fi prompting label present position, and Wi-Fi signal is very strong, and Wi-Fi has particularly preferred availability.
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| CN201410111685.7A CN103872797B (en) | 2014-03-24 | 2014-03-24 | A kind of passive Wi-Fi prompting label |
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| CN201410111685.7A CN103872797B (en) | 2014-03-24 | 2014-03-24 | A kind of passive Wi-Fi prompting label |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107453493A (en) * | 2017-01-21 | 2017-12-08 | 郑州航空工业管理学院 | A kind of WIFI mobile phones charging system |
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| US20070013486A1 (en) * | 2004-01-30 | 2007-01-18 | Toppan Printing Co., Ltd. | Radio frequency identification and communication device |
| CN101034138A (en) * | 2006-03-08 | 2007-09-12 | 新德科技股份有限公司 | Monitoring system of battery capacity |
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|---|---|---|---|---|
| US20070013486A1 (en) * | 2004-01-30 | 2007-01-18 | Toppan Printing Co., Ltd. | Radio frequency identification and communication device |
| CN101034138A (en) * | 2006-03-08 | 2007-09-12 | 新德科技股份有限公司 | Monitoring system of battery capacity |
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| 刘艳艳，张亮，张为，陈曙光: "一种13.56MHz无源射频识别模拟前端的设计", 《微电子学》 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107453493A (en) * | 2017-01-21 | 2017-12-08 | 郑州航空工业管理学院 | A kind of WIFI mobile phones charging system |
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