CN103872797B - A kind of passive Wi-Fi prompting label - Google Patents
A kind of passive Wi-Fi prompting label Download PDFInfo
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- CN103872797B CN103872797B CN201410111685.7A CN201410111685A CN103872797B CN 103872797 B CN103872797 B CN 103872797B CN 201410111685 A CN201410111685 A CN 201410111685A CN 103872797 B CN103872797 B CN 103872797B
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Abstract
A kind of passive Wi-Fi prompting label, it relates to the design and manufacture field of unicircuit, for being attached to power and the operability of public place full position prompting Wi-Fi signal. A part of magnetic line of force in Wi-Fi magnetic field is through the coil of Wi-Fi prompting label. Electric capacity generation resonance in sheet outside antenna coil inductance and sheet, creates a voltage on aerial coil, different Wi-Fi intensity, coil-induced go out different big small voltage. Using just can as the power supply of Digital Logic and LED pilot lamp after its rectification, current limliting. Meanwhile, by rectifier out change into a corresponding voltage value with the volts DS of certain ripple by ADC. The clocksignal of Digital Logic is produced by the vibrator OSC simulating front end. The electric reset enable signal Digital Logic that simulation front end produces after power supply is stable resets, and it is bright that the size of the voltage value that Digital Logic exports according to ADC controls several LED, thus points out power and the operability of Wi-Fi signal.
Description
Invention field
The present invention relates to the design and manufacture field of unicircuit, more specifically, the present invention relates generally to a kind of Wi-Fi prompting label, for being attached to power and the operability thereof of public place full position prompting Wi-Fi signal.
Background technology
Wi-Fi (WirelessFidelity) also known as 802.11b standard, be a kind of can technology wirelessly interconnection for the terminals such as notebook computer, panel computer, mobile phone. Interoperability between radio network product based on IEEE802.11 standard has been improved by Wi-Fi. This technology uses the frequency range near 2.4GHz, and this frequency range also belongs to the wireless frequency range of license useless at present.
The advantage that Wi-Fi technology is given prominence to is:
The first, the wide coverage of radiowave, radius can reach about 100 meters, it is possible to uses in office, it is also possible in Zheng Dong building, and an even bigger panel region uses.
Two, transmission speed is quickly, it is possible to reach 11Mbps, meets the demand of individual and social informatization.
Three, manufacturer to enter the threshold in this field lower. Network wiring is carried out without at substantial fund, if at station, airport, campus, personnel's comparatively dense such as Library local setting " focus ", by high speed circuit, Internet accessed these places, as long as the notebook computer of support WLAN, panel computer, mobile phone are taken in this region by user, get final product high-peed connection Internet, thus 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 computer, panel computer, mobile phone are all with Wi-Fi function, and they can search for Wi-Fi signal, and shows the intensity of corresponding Wi-Fi signal. In public place, also there is no a kind of small, dedicated equipment for showing Wi-Fi signal strength succinct especially at present.
Summary of the invention
It is an object of the invention to propose a kind of passive Wi-Fi prompting label, this prompting label does not need extraneous offer power supply, produces voltage by self induction Wi-Fi signal and provides power supply; Except coil antenna with for, except the LED showing Wi-Fi intensity, remaining circuit is all on one chip integrated, 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 simulation front end part and digital logic portion; Chip exterior comprises ruhmkorff coil and LED pilot lamp.
Hereinafter this passive Wi-Fi prompting label is described in detail.
Prompting label chip internal comprises simulation front end part and digital logic portion, and wherein simulation leading section is divided and comprised power supply generation module, electrification reset module, data acquisition module, clock generation module;
The power supply generation module of described simulation front end comprises radio frequency interface, rectifier, limiter, band gap benchmark; Complete the acquisition of outside Wi-Fi signal energy, provide power supply, power-on reset signal, magnitude of voltage and clock to digital logic portion, for LED pilot lamp is powered.
Radio frequency interface is connected with the rectifier of the power supply generation module of described simulation front end; Radio frequency interface obtains outside Wi-Fi signal energy by antenna coupling, and this signal to rectifier. The outside Wi-Fi signal energy that rectifier received RF interface obtains, produces the volts DS with certain ripple, exports to limiter and data acquisition module. Limiter receives the voltage that rectifier exports, and under the votage reference that band gap benchmark provides certain, producing stable volts DS is chip power supply.
When Wi-Fi prompting label is near outside Wi-Fi signal, electric capacity generation resonance in the outer inductance of sheet and sheet, by the resistive load of Wi-Fi signal energy trasfer to Wi-Fi prompting label chip internal. Outside sheet, inductance two ends is 2.4GHz sinusoidal alternating voltage, voltage signal produces the volts DS with certain ripple after rectifier rectification, this voltage can drop in the very little scope of change accurately after limiter, and can not changing with the change of outside Wi-Fi signal energy intensity, band gap benchmark (Bandgap) is limiter, electrification reset module provides certain votage reference.
Described electrification reset module comprises comparer and delay unit, comparer "+" hold the voltage of supply exported with the power supply generation module of described simulation front end to be connected, "-", end was connected with the band gap benchmark of the power supply generation module of described simulation front end, comparer exports and connects delay unit, exports power-on reset signal to digital logic portion through delay unit.
At the beginning of Wi-Fi prompting label chip powers on, the state of the inner register of Wi-Fi prompting label chip digital logical gate is uncertain. Wi-Fi prompting label chip analog front, after power supply is stable, produces power-on reset signal and digital logic portion 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 signal strength changes, in the power supply generation module of Wi-Fi prompting label chip, voltage of alternating current is converted to the volts DS with certain ripple by rectifier, the input end of analog signal volts DS of this size variation being connected on ADC, digital signal output end exports the numerical value of the volts DS of this size variation.
Described clock generation module is a low-power consumption vibrator OSC, provides power supply by the power supply generation module of described simulation front end, and clock signal is to digital logic portion.
The digital logic portion of prompting label chip internal is a MCUcore, and its main function is the light on and off number controlling each LED, reacts power and the operability thereof of Wi-Fi prompting label present position Wi-Fi signal with this.
The volts DS with certain ripple exported by rectifier in Wi-Fi prompting label chip analog front, after ADC, obtains 4 bit binary value, represents this size with the volts DS of certain ripple; This 4 bit data is connected on 4 GPIO of MCUcore respectively; By Wi-Fi prompting label chip analog front provide voltage of supply, power-on reset signal, clocksignal, MCUcore starts working, its internal processes processes accordingly, control the output of other 5 GPIO, and then the light on and off of control 5 LED, the power of display Wi-Fi signal and operability thereof.
Described chip exterior ruhmkorff coil L is parallel to chip internal electric capacity C two ends, composition LC resonance loop. When Wi-Fi prompting label is near outside Wi-Fi signal, Wi-Fi signal energy trasfer is given the rectifier of the power supply generation module of described simulation front end by LC resonance loop.
The LED pilot lamp of described chip exterior is used for showing power and the operability thereof of Wi-Fi signal. 5 LED pilot lamp positive poles all connect the voltage that the limiter of the power supply generation module of described simulation front end exports, and negative pole is connected respectively on 5 GPIO of MCUcore. When the GPIO of the MCUcore being connected with certain LED pilot lamp is lower level, this LED pilot lamp is bright, otherwise, this LED pilot lamp goes out.
The shell of this Wi-Fi prompting label is that one piece of square plastic card, chip and sheet exterior loop are encapsulated in card inside, draws 5 wires from card inside, connects outside 5 LED pilot lamp, and 5 LED pilot lamp are neatly fixed on card by spacing such as lines; The mode that this Wi-Fi prompting label is fixed on public arena is very simple, and there is stickup glue at the back side of Wi-Fi prompting label, chooses the postpone of suitable installation position, directly it is sticked just.
Compared with prior art, the present invention has following useful effect.
1. this Wi-Fi prompting label is passive, does not need extraneous offer power supply, produces voltage by self induction Wi-Fi signal and provides power supply.
2. this Wi-Fi prompting label is originally except coil antenna with for, except the LED pilot lamp showing Wi-Fi intensity, remaining circuit is all on one chip integrated, simple for structure small and exquisite, easy for installation.
Accompanying drawing explanation
Fig. 1 simulation front-end interface schematic diagram.
Fig. 2 simulates front end system structure.
Fig. 3 power supply generation module schematic diagram.
Fig. 4 Digital Logic interface schematic diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further described.
In the present invention, being complete by the simulation front end of Wi-Fi prompting label with the direct interaction of outside Wi-Fi signal, simulation front end part has needed the acquisition of outside Wi-Fi signal energy. For the digital logic portion of Wi-Fi prompting label chip internal, the effect of simulation front end provides power supply, power-on reset signal, magnitude of voltage and clock to digital logic portion. Being illustrated in figure 1 Wi-Fi prompting label simulation front-end interface schematic diagram, simulation front end is ruhmkorff coil with the interface of outside Wi-Fi signal, and there are power supply, electrification reset, magnitude of voltage and clock in simulation front end with the interface of numeral part.
As shown in Figure 2, in the present invention, simulation front end forms primarily of four function modules: power supply generation module, electrification reset module, data acquisition module and clock signal generating module.
Wi-Fi prompting label chip obtains energy by electromagnetic field couples. Simulation front end is sheet exterior loop with the interface of outside Wi-Fi signal, outside Wi-Fi signal is space alternating electromagnetic field, coils is changed into alternating voltage after being coupled, through rectifier, voltage of alternating current is converted to the volts DS with certain ripple, and by limiter, voltage is limited to specific value and is supplied to other modules of Wi-Fi prompting label as power supply.
As shown in Figure 3, being power supply generation module schematic diagram, power supply generation module comprises radio frequency interface, rectifier, limiter and band gap benchmark. 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 volts DS with certain ripple, exports to limiter and data acquisition module. Limiter receives the voltage that rectifier exports, and under the votage reference that band gap benchmark provides certain, producing stable volts DS is chip power supply.
The rectifier of the power supply generation module simulating front end described in described radio frequency interface is connected; Radio frequency interface is coupled from Wi-Fi signal acquisition energy by antenna, is powered to Wi-Fi other circuit of prompting label chip internal and LED pilot lamp by energy trasfer by the LC resonance loop of inside.
Wi-Fi prompting label is by the energy in electromagnetic induction coupled room for other circuit of Wi-Fi prompting label provide power supply, and the voltage at coil two ends is exchange signal, carries out AC-DC conversion by rectifier, produces volts DS.
The voltage size of the direct supply that Wi-Fi prompting label rectifier produces is relevant with the size of voltage on coil, and namely more strong voltage is more big for space W i-Fi signal. If Wi-Fi signal strength is relatively strong, the energy expenditure that the power consumption of Wi-Fi prompting label chip internal circuits is not enough to absorb coil is fallen, and the voltage on coil will raise, and this will cause Wi-Fi prompting label voltage of supply too high, and device burns out. So, introduce limiter and the unnecessary fault offset that Wi-Fi prompting label coil absorbs is fallen, and Wi-Fi prompting label voltage of supply is stabilized in the value of needs.
In the present invention, produce the stable votage reference not changed with flow-route and temperature with band gap benchmark (Bandgap), for limiter, electrification reset module provide certain benchmark.
Electricity reseting module comprises comparer and delay unit, comparer "+" hold the voltage of supply exported with the power supply generation module of described simulation front end to be connected, "-", end was connected with the band gap benchmark of the power supply generation module of described simulation front end, comparer exports and connects delay unit, exports power-on reset signal to digital logic portion through delay unit.
At the beginning of Wi-Fi prompting label chip powers on, the state of the inner register of digital logic portion is uncertain, and Wi-Fi prompting label simulation front end produces power-on reset signal after power supply is stable makes digital logic portion reset.
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. Wi-Fi prompting label simulation front end is sheet exterior loop with the interface of outside Wi-Fi signal, outside Wi-Fi signal is space alternating electromagnetic field, coils is changed into alternating voltage after being coupled, through rectifier, voltage of alternating current is converted to the volts DS with certain ripple, the input end of analog signal this volts DS being connected on ADC, digital signal output end exports the numerical value of this volts DS.
Clock generation module is a low-power consumption vibrator OSC, provides power supply by the power supply generation module of described simulation front end, and clock signal is to digital logic portion.
As shown in Figure 4, it is Digital Logic interface schematic diagram. The power supply of MCUcore is simulated front end by Wi-Fi prompting label and is provided. The vibrator OSC that clocksignal needed for MCUcore simulates front end by Wi-Fi prompting label produces. At the beginning of Wi-Fi prompting label chip powers on, the state of the inner register of MCUcore is uncertain, and the electric reset enable signal numeral part that simulation front end produces after power supply is stable resets, and MCUcore starts working. According to the digital quantity d3d2d1d0 that ADC exports, MCUcore internal processes carries out respective handling:
A. when 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 Wi-Fi signal is extremely weak, and Wi-Fi is without operability;
B. when d3d2d1d0 is 1011, GPIO1 is 0, GPIO2��5 is 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 Wi-Fi signal is weak, and Wi-Fi may have operability;
C. when d3d2d1d0 is 1100, GPIO1, GPIO2 are 0, GPIO3��5 is all that 1, LED1, LED2 are bright, and all the other LED go out, and represents that there is Wi-Fi signal Wi-Fi prompting label present position, and Wi-Fi signal is general, and Wi-Fi has operability;
D., when d3d2��d0 is 1101, GPIO1, GPIO2, GPIO3 to be 0, GPIO4��5 be all 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 relatively strong, and Wi-Fi has better operability;
E., when d3d2d1d0 is 1110, GPIO1, GPIO2, GPIO3, GPIO4 are 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 operability;
F. when 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 operability.
Claims (5)
1. a passive Wi-Fi prompting label, it is characterised in that: this passive Wi-Fi prompting label comprises prompting label chip internal and prompting label chip exterior; Described prompting label chip internal comprises simulation front end part and digital logic portion; Chip exterior comprises ruhmkorff coil and LED pilot lamp;
Prompting label chip internal comprises simulation front end part and digital logic portion, and wherein simulation leading section is divided and comprised power supply generation module, electrification reset module, data acquisition module, clock generation module;
The power supply generation module of described simulation front end comprises radio frequency interface, rectifier, limiter, band gap benchmark; Complete the acquisition of outside Wi-Fi signal energy, provide power supply, power-on reset signal, magnitude of voltage and clock to digital logic portion, for LED pilot lamp is powered;
Radio frequency interface is connected with the rectifier of the power supply generation module of described simulation front end; Radio frequency interface obtains outside Wi-Fi signal energy by antenna coupling, and this signal to rectifier; The outside Wi-Fi signal energy that rectifier received RF interface obtains, produces the volts DS with certain ripple, exports to limiter and data acquisition module; Limiter receives the voltage that rectifier exports, and under the votage reference that band gap benchmark provides certain, producing stable volts DS is chip power supply;
When Wi-Fi prompting label is near outside Wi-Fi signal, electric capacity generation resonance in the outer inductance of sheet and sheet, by the resistive load of Wi-Fi signal energy trasfer to Wi-Fi prompting label chip internal; Outside sheet, inductance two ends is 2.4GHz sinusoidal alternating voltage, voltage signal produces the volts DS with certain ripple after rectifier rectification, this voltage can drop in the very little scope of change accurately after limiter, and can not changing with the change of outside Wi-Fi signal energy intensity, band gap benchmark is limiter, electrification reset module provides certain votage reference;
Described electrification reset module comprises comparer and delay unit, comparer "+" hold the voltage of supply exported with the power supply generation module of described simulation front end to be connected, "-", end was connected with the band gap benchmark of the power supply generation module of described simulation front end, comparer exports and connects delay unit, exports power-on reset signal to digital logic portion through delay unit;
At the beginning of Wi-Fi prompting label chip powers on, the state of the inner register of Wi-Fi prompting label chip digital logical gate is uncertain; Wi-Fi prompting label chip analog front, after power supply is stable, produces power-on reset signal and digital logic portion 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 signal strength changes, in the power supply generation module of Wi-Fi prompting label chip, voltage of alternating current is converted to the volts DS with certain ripple by rectifier, the input end of analog signal volts DS of this size variation being connected on ADC, digital signal output end exports the size of the volts DS of this size variation;
Described clock generation module is a low-power consumption vibrator OSC, provides power supply by the power supply generation module of described simulation front end, and clock signal is to digital logic portion;
The digital logic portion of prompting label chip internal is a MCUcore, and its main function is the light on and off number controlling each LED, reacts power and the operability thereof of Wi-Fi prompting label present position Wi-Fi signal with this;
The volts DS with certain ripple exported by rectifier in Wi-Fi prompting label chip analog front, after ADC, obtains 4 bit binary value, represents this size with the volts DS of certain ripple; This 4 bit data is connected on 4 GPIO of MCUcore respectively; By Wi-Fi prompting label chip analog front provide voltage of supply, power-on reset signal, clocksignal, MCUcore starts working, its internal processes processes accordingly, control the output of other 5 GPIO, and then the light on and off of control 5 LED, the power of display Wi-Fi signal and operability thereof.
3. the passive Wi-Fi prompting label of one according to claim 1, it is characterised in that: described chip exterior ruhmkorff coil L is parallel to chip internal electric capacity C two ends, composition LC resonance loop; When Wi-Fi prompting label is near outside Wi-Fi signal, Wi-Fi signal energy trasfer is given the rectifier of the power supply generation module of described simulation front end by LC resonance loop;
The LED pilot lamp of described chip exterior is used for showing power and the operability thereof of Wi-Fi signal; 5 LED pilot lamp positive poles all connect the voltage that the limiter of the power supply generation module of described simulation front end exports, and negative pole is connected respectively on 5 GPIO of MCUcore; When the GPIO of the MCUcore being connected with certain LED pilot lamp is lower level, this LED pilot lamp is bright, otherwise, this LED pilot lamp goes 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 one piece of square plastic card, chip and sheet exterior loop are encapsulated in card inside, 5 wires are drawn from card inside, connecting outside 5 LED pilot lamp, 5 LED pilot lamp are neatly fixed on card by spacing such as lines; The mode that this Wi-Fi prompting label is fixed on public arena is very simple, and there is stickup glue at the back side of Wi-Fi prompting label, chooses the postpone of suitable installation position, directly it is sticked just.
5. the passive Wi-Fi prompting label of one according to claim 1, it is characterised in that: the power supply of MCUcore is simulated front end by Wi-Fi prompting label and is provided; The vibrator OSC that clocksignal needed for MCUcore simulates front end by Wi-Fi prompting label produces; At the beginning of Wi-Fi prompting label chip powers on, the state of the inner register of MCUcore is uncertain, and the electric reset enable signal numeral part that simulation front end produces after power supply is stable resets, and MCUcore starts working; According to the digital quantity d3d2d1d0 that ADC exports, MCUcore internal processes carries out respective handling:
A. when 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 Wi-Fi signal is extremely weak, and Wi-Fi is without operability;
B. when d3d2d1d0 is 1011, GPIO1 is 0, GPIO2��5 is 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 Wi-Fi signal is weak, and Wi-Fi may have operability;
C. when d3d2d1d0 is 1100, GPIO1, GPIO2 are 0, GPIO3��5 is all that 1, LED1, LED2 are bright, and all the other LED go out, and represents that there is Wi-Fi signal Wi-Fi prompting label present position, and Wi-Fi signal is general, and Wi-Fi has operability;
D., when d3d2��d0 is 1101, GPIO1, GPIO2, GPIO3 to be 0, GPIO4��5 be all 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 relatively strong, and Wi-Fi has better operability;
E., when d3d2d1d0 is 1110, GPIO1, GPIO2, GPIO3, GPIO4 are 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 operability;
F. when 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 operability.
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| 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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| CN101034138A (en) * | 2006-03-08 | 2007-09-12 | 新德科技股份有限公司 | Monitoring system of battery capacity |
Non-Patent Citations (2)
| Title |
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| 一种13.56MHz无源射频识别模拟前端的设计;刘艳艳，张亮，张为，陈曙光;《微电子学》;20121231;第42卷(第6期);749－752 * |
| 基于施密特比较器的高可靠上电复位电路;方明，姚若河;《微电子学》;20101031;第40卷(第5期);709－712 * |
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