CN115941040A - Visible light energy-carrying communication circuit and device based on photovoltaic device - Google Patents
Visible light energy-carrying communication circuit and device based on photovoltaic device Download PDFInfo
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- CN115941040A CN115941040A CN202310166111.9A CN202310166111A CN115941040A CN 115941040 A CN115941040 A CN 115941040A CN 202310166111 A CN202310166111 A CN 202310166111A CN 115941040 A CN115941040 A CN 115941040A
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Abstract
The invention provides a visible light energy-carrying communication circuit and device based on a photovoltaic device, which are used for providing data signal output according to received optical signals and comprise: the photovoltaic detector, receiving circuit, boost circuit, charging plate, wherein, it has current sensing resistor to establish ties between photovoltaic detector and the boost circuit, and it has first condenser to establish ties between the input of boost circuit and the ground. The photovoltaic device-based visible light energy-carrying communication circuit and the device reuse the photovoltaic detector for signal receiving and energy collection, the current on the current sensing resistor is low influenced by the voltage on the first capacitor while the first capacitor is charged and discharged, the consistency of the current on the current sensing resistor and the intensity change response of the photovoltaic detector to the received light signal is high, the high efficiency of energy collection is realized, the reliability of communication is guaranteed, the circuit is simple and effective to realize, the occupied space requirement of a system is effectively reduced, and the resource requirement of system realization is saved.
Description
Technical Field
The invention relates to the technical field of visible light communication, in particular to a visible light energy-carrying communication circuit and device based on a photovoltaic device.
Background
Nowadays, visible Light Communication (VLC) technology in the world develops rapidly, and this technology generally performs information transmission at a switching frequency that is imperceptible to human eyes. If the information communication between the things of the internet of things is carried out by using visible light communication, the data transmission can be carried out by using light, the corresponding light energy can be collected, and the information transmission can be completed by the communication of the internet of things at a low transmission rate.
The internet of things equipment provided with the photovoltaic detector can collect light energy from an LED (light emitting diode) lamp and the external environment and can also receive information of optical codes.
In the prior art, the receiving circuit of the visible light communication system equipped with the photovoltaic detector is structured by two branches, one branch is used for data receiving, and the other branch is used for energy collection. Filtering in the data receiving branch circuit to obtain an alternating current signal in the input current; the choke inductance is used in the energy collection branch to filter out the useful signal and let the direct current signal pass through. This method causes the energy received by the system to be split into two branches, making both data reception and energy collection efficiencies less than ideal.
Disclosure of Invention
Based on the above, the invention aims to provide a visible light energy-carrying communication circuit and device based on a photovoltaic device, so as to improve the energy collection efficiency and communication quality of visible light communication.
In one aspect, the present invention provides a photovoltaic device based visible light energy-carrying communication circuit, which provides data signal output according to a received optical signal, including:
a photovoltaic type detector for providing an electrical signal in accordance with the received optical signal;
the booster circuit is used for providing charging voltage output according to the electric signal;
the charging plate is used for charging according to the charging voltage so as to store energy;
and a current sensing resistor connected in series in the energy output path from the photovoltaic detector to the charging plate;
a receiving circuit connected to the current sensing resistor to provide the data signal according to a voltage signal across the current sensing resistor;
wherein the charging plate is also used for power supply of the visible light energy-carrying communication circuit based on the photovoltaic device, and the optical signal comprises visible light.
Optionally, the boost circuit comprises:
the input pin of the boost chip is the input end of the boost circuit, the enable pin of the boost chip is connected with the input pin, and the boost chip provides charging voltage output at the output pin of the boost chip;
a first inductor connected between an inductance pin and an input pin of the boost chip;
a second resistor and a third resistor which are sequentially connected between the output end of the boost chip and the ground in series, wherein the intermediate node of the second resistor and the third resistor is connected to the feedback pin of the boost chip;
and the second capacitor is connected between the output pin of the boosting chip and the ground.
Optionally, the receiving circuit comprises:
the instrument amplifier is used for providing a first voltage signal according to the voltage signal;
an active band-pass filter for providing a second voltage signal according to the first voltage signal;
and the comparison circuit is used for providing the data signal according to the second voltage signal and a preset reference level signal.
Optionally, the instrumentation amplifier comprises:
a first input pin and a second input pin of the instrument amplifier are respectively connected with two ends of the current sensing resistor;
a fourth resistor connected between an external resistance pin of the instrumentation amplifier and a reference level pin;
a fifth resistor connected between the output of the instrumentation amplifier and a reference level pin.
Optionally, the active band-pass filter includes a first-order active high-pass filter circuit and a second-order active low-pass filter circuit sequentially connected in series between the input end and the output end of the active band-pass filter, so as to provide the second voltage signal at the output end thereof according to the first voltage signal received at the input end thereof.
Optionally, the comparison circuit comprises:
the comparator is used for providing the data signal according to the second voltage signal and a preset reference level signal;
a tenth resistor connected between the output terminal of the comparator and a power supply.
Optionally, the photovoltaic device-based visible light energy-carrying communication circuit further includes a reference level circuit for providing the reference level signal, the reference level circuit includes:
a sixth capacitor connected between a reference level signal input terminal of the comparator and ground;
and the potentiometer is connected between a power supply and the ground in series, and the selection end of the potentiometer is connected to the reference level signal input end of the comparator.
Optionally, the photovoltaic detector comprises at least six photovoltaic elements connected in series or in parallel.
According to the visible light energy-carrying communication circuit based on the photovoltaic device, the current sensing resistor is connected in series on the energy output path of the photovoltaic detector, the current sensing resistor responds to the current intensity on the energy output path of the photovoltaic detector and senses a voltage signal under the condition that the current characteristic on the energy output path is not influenced, the receiving circuit obtains data information carried by a light signal received by the photovoltaic detector according to the voltage signal, and the condition that the receiving circuit consumes the output energy of the photovoltaic detector due to the fact that the receiving circuit is connected with an extra current signal is avoided. The visible light energy-carrying communication circuit based on the photovoltaic device concentrates the output energy of the photovoltaic detector on one energy output path, the output energy is stored to the charging plate through the booster circuit, the energy conversion and storage efficiency is improved, meanwhile, the photoelectric response output characteristic of the photovoltaic detector is low in influence of the receiving circuit, the fidelity on the energy output path is high, the quality of a voltage signal provided by the current sensing resistor in a sensing mode can be improved, and the communication quality is further improved. Meanwhile, the converted and stored energy can be used for the working power supply of the system, the energy conversion and storage efficiency is improved, the energy self-supply capacity of the visible light energy-carrying communication circuit based on the photovoltaic device is further improved, and meanwhile, the working reliability of the system power utilization element and the communication reliability can be improved due to better power supply quality.
According to another aspect of the invention, there is provided a photovoltaic device based visible light energy carrying communication device comprising:
a transmitting module for providing an optical signal output according to an input data signal;
and a receiving module, configured to obtain an output data signal matched with the input data signal according to the optical signal provided by the sending module, where the receiving module includes the photovoltaic device-based visible light energy-carrying communication circuit provided in accordance with the first aspect of the present invention.
Drawings
Fig. 1 is a schematic structural diagram of a communication device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a receiving module of a communication device according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a receiving module of the communication device according to the embodiment of the present invention;
FIG. 4 is a frequency band diagram of a band-pass filter with a specific parameter specification for a receiving module of a communication device according to an embodiment of the present invention;
FIG. 5 is a waveform diagram of a portion of signals under a specific parameter specification of a receiving module of a communication device according to an embodiment of the present invention;
fig. 6 is a graph showing the voltage across the photovoltaic detector and the boosted voltage under a specific parameter specification of the receiving module of the communication device in the embodiment of the present invention.
Description of the main element symbols:
| boost chip | U1 | Instrument amplifying chip | U2 |
| A first operational amplifier | U3 | A second operational amplifier | U4 |
| Comparator with a comparator circuit | U5 | Photovoltaic type detector | PV |
| Current sensing resistor | R1 | Second to tenth resistors | R2~R10 |
| Potentiometer with adjustable voltage | R11 | First to sixth capacitors | C1~C6 |
| First inductor | L1 |
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Several embodiments of the invention are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, a photovoltaic device-based visible light energy-carrying communication device 1000 (herein, simply referred to as communication device 1000) according to an embodiment of the present invention is shown, which includes a sending module 100 and a receiving module 300 (i.e., a photovoltaic device-based visible light energy-carrying communication circuit).
The transmitting module 100 includes a driving circuit 110 and a light emitting diode 120, and the driving circuit 110 drives the light emitting diode 120 to emit a corresponding visible light signal to the receiving module 300 according to an input data signal under the driving of a driving current.
The receiving module 300 mainly includes a photovoltaic detector PV, a current sensing resistor R1, a voltage boosting circuit 310, a charging pad 320, and a receiving circuit 330.
The cathode of the photovoltaic detector PV is grounded, the anode of the photovoltaic detector PV is connected to one end of the current sensing resistor R1, the other end of the current sensing resistor R1 is connected to the voltage boosting circuit 310, when the photovoltaic detector PV receives the visible light signal, a voltage drop is generated across the voltage boosting circuit 310, so that the voltage boosting circuit 310 obtains a voltage input, and provides a charging voltage for the charging board 320 after the voltage boosting process, the charging board 320 charges and stores energy according to the charging voltage, the stored energy can be used for power supply of each power unit in the receiving module 300, the receiving module 300 can obtain energy supplement from the received light signal or the ambient light, and the supply requirement of an external power supply is reduced.
In an alternative embodiment, the communication device 1000 further includes other modules such as a decoding module and a power module for decoding the output data signal OUT, and the energy stored in the charging board block 320 can be used for power supply of the other modules such as the decoding module and the power module.
The two ends of the current sensing resistor R1 are connected to the receiving circuit 330, so that the receiving circuit 330 can obtain the photovoltaic sensing intensity of the photovoltaic detector PV according to the voltage drop of the two ends of the current sensing resistor R1, further obtain the intensity characteristic of a received optical signal, obtain an output data signal OUT matched with an input data signal after processing, realize the wireless transmission of data and realize the communication requirement.
In summary, the communication device in the above embodiments of the present invention can reduce the space occupation of the system energy storage and charging implementation components, provide convenience for the integrated design of the communication device, and improve the charging and energy storage effect under various environmental light intensities, and has strong self-power supply capability, thereby improving the reliability, endurance and practical value of the communication device.
Referring to fig. 2, a schematic structural diagram of a receiving module 300 of a communication device according to an embodiment of the invention is shown.
In the present embodiment, the receiving module 300 comprises a photovoltaic type detector PV, a boosting circuit 310, a charging board 320, an instrumentation amplifier 331, an active band-pass filter 332, a comparison circuit 333, and a current sensing resistor R1.
The instrumentation amplifier 331, the active band-pass filter 332, and the comparison circuit 333 are specific structures of the receiving circuit 330, the photovoltaic detector PV provides an electrical signal to the boosting circuit 310 in response to a received optical signal, the current sensing resistor R1 is connected in series to an energy output path of the photovoltaic detector PV, and a voltage signal is sensed at both ends of the energy output path in response to a current on the energy output path.
The instrumentation amplifier 331 is connected to voltage signals at two ends of the current sensing resistor R1, performs amplification processing, provides a first voltage signal to the active band-pass filter 332, the active band-pass filter 332 filters interference items in the first voltage signal to obtain a second voltage signal, and the comparison circuit 333 obtains an output data signal OUT according to comparison between the second voltage signal and a preset reference level signal to realize analysis of data contained in the received optical signal.
Referring to fig. 3, a specific circuit structure of a receiving module 300 of a communication device in an embodiment of the invention is shown.
In the receiving module 300 in the embodiment of the present invention, the cathode of the photovoltaic type detector PV is grounded, the anode is connected to one end of the current sensing resistor R1, and the other end of the current sensing resistor R1 is connected to the input terminal of the boosting circuit 310.
In an alternative embodiment, the photovoltaic detector PV includes at least six photovoltaic components connected in series or in parallel, and it can be understood that in this application, the photovoltaic components include photovoltaic components with high photoelectric conversion efficiency, such as but not limited to photovoltaic cells, photodiodes, perovskite cells, thin-film solar cells, photothyristors, and array-type photovoltaic devices, which can improve the energy obtained by the communication circuit of the present invention from a received light signal or an ambient light signal, improve the energy self-sufficiency of the system, and reduce the power supply requirement of the system in an environment far away from the power grid.
And photovoltaic device compares in prior art photoelectric conversion devices such as PIN pipe and avalanche diode commonly used and has stronger interference killing feature to outdoor highlight, can be applicable to multiple outdoor operational environment, and the communication circuit of this application can be applicable to indoor and outdoor operational environment simultaneously promptly.
The boosting circuit 310 includes a boosting chip U1, a first capacitor C1, a second capacitor C2, a first inductor L1, a second resistor R2, and a third resistor R3. An input pin VIN of the boost chip U1 is connected with an enable pin EN and corresponds to the input end of the boost circuit 310; the first capacitor C1 is connected between the input pin VIN of the boost chip U1 and the ground; the first inductor L1 is connected between the inductance pin L of the boost chip U1 and the input pin VIN; the second resistor R2 and the third resistor R3 are sequentially connected in series between an output pin VOUT of the boost chip U1 and the ground, a middle node of the second resistor R2 and the third resistor R3 is connected to a feedback pin FB of the boost chip U1 to sample the output voltage of the boost chip U1 and feed the output voltage back to the boost chip U1, and the boost chip U1 adjusts the output voltage according to the feedback to ensure the stability of the output voltage; a grounding pin GND of the boost chip U1 is grounded; the second capacitor C2 is connected between the output pin of the boost chip U1 and ground to further improve the stability of the output voltage of the boost chip U1.
The charging terminal of the charging plate 320 is connected to the output terminal of the voltage boost circuit 310, and when the voltage boost circuit 310 provides a charging voltage output, the charging can be performed to store energy, and the stored energy can be used for power supply of the receiving module 300.
The instrument amplifier 331 comprises an instrument amplification chip U2, a fourth resistor R4 and a fifth resistor R5, a first input pin (pin 2 of the instrument amplification chip U2) and a second input pin (pin 3 of the instrument amplification chip U2) of the instrument amplification chip U2 are connected with two ends of the current sensing resistor R1, a pin 7 of the instrument amplification chip U2 is connected with a power supply (in the embodiment, a 3.3V direct current voltage supply), and a pin 4 of the instrument amplification chip U2 is grounded; the fourth resistor R4 is connected between an external resistance pin (pin No. 5 of the instrument amplification chip U2) and a reference level pin (pin No. 1 of the instrument amplification chip U2) of the instrument amplification chip U2, and the fifth resistor R5 is connected between an output pin (pin No. 6 of the instrument amplification chip U2) and the reference level pin (pin No. 1 of the instrument amplification chip U2) of the instrument amplification chip U2.
The instrumentation amplification chip U2 provides at its output pin 6 a first voltage signal having an amplification factor G =5+5 (R5/R4) compared to the voltage drop across the current sensing resistor R1, where R4 is the resistance of the fourth resistor R4 and R5 is the resistance of the fifth resistor R5. In the embodiment, the fourth resistor R4 and the fifth resistor R5 are disposed outside the instrumentation amplification chip U2, and the configuration thereof can be flexibly changed according to specific requirements, thereby improving the practicability of the instrumentation amplifier 331.
In an alternative embodiment, the meter amplification chip U2 is an INA322.
The active band pass filter 332 includes a first-order active high pass filter circuit and a second-order active low pass filter circuit sequentially connected in series between an input terminal and an output terminal thereof.
In the present embodiment, the first-order active high-pass filter circuit includes a first operational amplifier U3, a third capacitor C3, a sixth resistor R6, and a seventh resistor R7. The inverting input end (pin No. 2 of the first operational amplifier U3) of the first operational amplifier U3 is connected with the output end (pin No. 1 of the first operational amplifier U3), the high-voltage bias end (pin No. 8 of the first operational amplifier U3) is connected with a power supply, and the low-voltage bias end (pin No. 4 of the first operational amplifier U3) is grounded; the third capacitor C3 is disposed between the input terminal of the active band-pass filter 332 and the non-inverting input terminal of the first operational amplifier U3 (pin No. 3 of the first operational amplifier U3) to receive the first voltage signal provided by the instrumentation amplifier 331; the sixth resistor R6 and the seventh resistor R7 are sequentially connected in series between the power supply and the ground, and an intermediate node between the sixth resistor R6 and the seventh resistor R7 is connected to the non-inverting input terminal (pin No. 3 of the first operational amplifier U3) of the first operational amplifier U3.
The initial frequency calculation formula of the first-order active high-pass filter circuit is as follows:
wherein f1 is the starting frequency of the first-order active high-pass filter circuit, R1 is the parallel resistance of the sixth resistor R6 and the seventh resistor R7, and C3 is the capacitance of the third capacitor C3.
In the present embodiment, the second-order active low-pass filter circuit includes a second operational amplifier U4, an eighth resistor R8, a ninth resistor R9, a fourth capacitor C4, and a fifth capacitor C5. The output end (pin 1 of the second operational amplifier U4) of the second operational amplifier U4 is connected with the inverting input end (pin 2 of the second operational amplifier U4); the eighth resistor R8 and the ninth resistor R9 are sequentially connected in series between the output end of the first operational amplifier U3 (pin No. 1 of the first operational amplifier U3) and the non-inverting input end of the second operational amplifier U4 (pin No. 3 of the second operational amplifier U4); the fourth capacitor C4 is connected in series with the intermediate node between the output end of the second operational amplifier U4 and the eighth resistor R8 and the ninth resistor R9; the fifth capacitor C5 is connected in series between the non-inverting input of the second operational amplifier U4 and ground.
The cutoff frequency calculation formula of the second-order active low-pass filter circuit is as follows:
wherein f2 is the cut-off frequency of the second-order active low-pass filter circuit, R9 is the resistance of the ninth resistor R9, C5 is the capacitance of the fifth capacitor C5, m is the resistance ratio of the eighth resistor R8 to the ninth resistor R9, n is the capacitance ratio of the fourth capacitor C4 to the fifth capacitor C5, the external elements corresponding to the parameters are independent of each other, and the resistor and the capacitor corresponding to the parameters can be conveniently selected according to the requirements of the actual system.
In an alternative embodiment, the first operational amplifier U3 and the second operational amplifier U4 are OPA2340 amplifier chips, it being understood that the invention is not limited to the specific chip selection described above.
In this embodiment, the comparing circuit 333 includes a comparator U5 and a tenth resistor R10, wherein a non-inverting input terminal (pin No. 1 of the comparator U5) of the comparator U5 is connected to the output terminal of the active band-pass filter 332, an inverting input terminal (pin No. 3 of the comparator U5) is connected to the reference level signal, a high-voltage bias terminal (pin No. 5 of the comparator U5) is connected to the power supply, a low-voltage bias terminal (pin No. 2 of the comparator U5) is connected to the ground, the tenth resistor R10 is connected between the power supply and the output terminal (pin No. 4 of the comparator U5) of the comparator U5, and the output data signal OUT is provided at the output terminal (pin No. 4 of the comparator U5) of the comparator U5.
In this embodiment, the reference level circuit 334 is further included, the reference level circuit 334 includes a sixth capacitor C6 and a potentiometer R11, the potentiometer R11 is connected between the power supply and the ground, the sixth capacitor is connected between the inverting input terminal of the comparator U5 (pin No. 3 of the comparator U5) and the ground, the selection terminal of the potentiometer R11 is connected to the inverting input terminal of the comparator U5, the voltage of the reference level signal provided by the reference level circuit 334 can be adjusted by adjusting the selection terminal of the potentiometer R11, and the reference level circuit is applicable to different system specifications, so that the compatibility of the system to the amplification factor of the instrumentation amplifier 331, the photovoltaic induction intensity of the photovoltaic detector PV, and the resistance value of the current induction resistor R1 is improved, and the system practicability is improved.
Referring to fig. 4, a band diagram of a bandpass filter with specific parameter specifications of a receiving module of a communication circuit according to an embodiment of the present invention is shown, where the parameter specifications include:
r1=1 Ω; r2=1M Ω; r3=178k Ω; r4=20k Ω; r5=200k Ω; r6=12M Ω; r7=12M Ω; r8=2.94k Ω; r9=21k Ω; r10=5k Ω; r11=1M Ω; c1=10 μ F; c2=10 μ F; c3=100pF; c4=2200pF; c5=470pF; l1=4.7 μ H; the chip model of the boosting chip U1 is TPS61220; the chip type of the instrument amplification chip U2 is INA322; the chip models of the first operational amplifier U3 and the second operational amplifier U4 are OPA2340; the chip model of the comparator U5 is LMV7011.
According to the formulas (1) and (2), the start frequency and the cut-off frequency of the active band-pass filter 332 are respectively f1=265Hz and f2=20kHz, referring to fig. 4, the corresponding frequency point information (x 1, y 1) is (265.2835, -3.0484), and (x 2, y 2) is (19.9880, -3.0521), and the calculation result shows that the active band-pass filter 332 can effectively filter the external extremely low frequency and high frequency noise and only retain useful information.
Referring to fig. 5 and fig. 6, waveform diagrams of partial signals under a specific parameter specification of a receiving module of a communication circuit according to an embodiment of the present invention are shown, where PV is a voltage across a photovoltaic detector PV, V4 is a second voltage signal provided by the active band-pass filter 332, OUT is an output data signal, and V1 is an output voltage of the voltage boost circuit 310.
As shown in fig. 5, the output voltage of the photovoltaic detector PV is 2.1V (i.e. the voltage drop between the anode and the cathode of the photovoltaic detector PV), the image output by the active band-pass filter 332 is slightly distorted, and the output data signal OUT obtained after passing through the comparison circuit 333 and the reference level circuit 334 can well restore the waveform of the previous input data signal.
As shown in fig. 6, the voltage boost circuit 310 of the present invention can boost the output voltage to 3.3V quickly, and can maintain the output voltage at about 3.3V stably, and the voltage drop amplitude is small during the period when the output voltage of the photovoltaic detector PV is at low level, so as to effectively ensure the charging effect of the photovoltaic detector PV on the charging plate 320.
The Visible light energy-carrying communication circuit based on the photovoltaic device can provide data signal output according to received optical signals, and achieves Visible light energy-carrying communication (SVIPT) and comprises the following components: a photovoltaic type detector for providing an electrical signal in response to the received optical signal; the booster circuit is used for providing charging voltage output according to the electric signal; the charging plate is used for charging according to the charging voltage so as to store energy; and a current sensing resistor connected in series in the energy output path from the photovoltaic detector to the charging plate;
a receiving circuit connected to the current sensing resistor to provide the data signal according to a voltage signal across the current sensing resistor; wherein the charging plate is also used for power supply of the photovoltaic device based visible light energy-carrying communication circuit, and the optical signal comprises visible light. The photovoltaic detector of the visible light energy-carrying communication circuit based on the photovoltaic device only comprises one energy output path, the energy conversion and storage efficiency is high, meanwhile, a current sensing resistor is connected in series on the energy output path and responds to the current on the energy output path to provide a voltage signal, a receiving circuit obtains data information carried by the optical signal received by the photovoltaic detector according to the voltage signal, the visible light communication is achieved, the receiving circuit consumes little direct energy on the energy output path of the photovoltaic detector, the output energy of the photovoltaic detector is stored to a charging plate through most of a boosting circuit, and the energy conversion and storage efficiency is high. And the electric signal fidelity on the single energy output path is better, the data signal distortion rate in communication is reduced, and the communication effect is improved.
Further, the higher energy conversion and storage efficiency enables the charging board to obtain more energy supply from the optical signal received by the system, and the energy stored by the charging board has stronger power supply capacity to the system itself, thereby providing convenience for the design of each power-using element of the receiving circuit in the system.
The first capacitor is connected in series between the input end of the booster circuit and the ground, so that the input voltage of the booster circuit is guaranteed, the reliability of energy collection is guaranteed, meanwhile, the oscillation condition of an electric signal responded by the photovoltaic detector can be kept in the charging and discharging process of the photovoltaic detector on the first capacitor, the voltage signal sampled on the current sensing resistor is highly matched with the received data signal, the data information collection is realized, and the reliability of communication is guaranteed.
And a second capacitor is arranged between an output pin of a boosting chip of the boosting circuit and the ground, so that the stability of the charging voltage provided by the boosting circuit can be further stabilized, and the charging effect is improved.
The current sensing resistor is connected in series on the output path of the photovoltaic detector, and can simply and effectively convert the photovoltaic sensing signal into a voltage signal corresponding to the voltage drop at two ends of the photovoltaic sensing signal, so that the processing circuit can process and obtain a data signal contained in the optical signal received by the system according to the voltage signal.
The receiving circuit is sequentially provided with an instrument amplifier, an active band-pass filter and a comparison circuit, and the received voltage signals are sequentially amplified, filtered and compared to obtain high-fidelity output data signals.
The instrument amplifier is high in accuracy and stability, the fourth resistor and the fifth resistor are arranged outside the instrument amplification chip, the amplification factor of the instrument amplifier can be conveniently and flexibly adjusted by adjusting the resistance values of the fourth resistor and the fifth resistor, the instrument amplifier can be flexibly matched with various specific requirements, and the practicability is high.
The active band-pass filter comprises a first-order active high-pass filter circuit and a second-order active low-pass filter circuit which are sequentially connected in series between the input end and the output end of the active band-pass filter, and can effectively filter the external extremely-low-frequency and high-frequency noise.
The reference level circuit provides a reference level signal for the comparison circuit, the reference level circuit is provided with a potentiometer, an adjustable reference level signal is provided at a selection end of the potentiometer, and the sixth capacitor is connected between the selection end of the potentiometer and the ground, so that the stability of the provided reference level signal can be improved, and the reliability of a comparison result of the comparison circuit is improved.
The invention also provides a photovoltaic device-based visible light energy-carrying communication device, which comprises a sending module for providing light signal output according to input data and a receiving module for obtaining an output data signal matched with the input data signal according to the light signal provided by the sending module, wherein the receiving module comprises the photovoltaic device-based visible light energy-carrying communication circuit provided by the invention, the data acquisition can be realized, meanwhile, energy can be acquired and stored from the received light signal, the stored energy can be used for power supply of a system, and resources can be saved. The received light signal includes some ambient light in addition to the light signal containing data provided by the sending module, and the energy source for collecting and storing energy is not limited thereto, and may be any received light.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above-mentioned embodiments only express some specific embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. A photovoltaic device-based visible light energy carrying communication circuit for providing a data signal output in response to a received light signal, comprising:
a photovoltaic type detector for providing an electrical signal in accordance with the received optical signal;
the booster circuit is used for providing charging voltage output according to the electric signal;
the charging plate is used for charging according to the charging voltage so as to store energy;
and a current sensing resistor connected in series on the energy output path from the photovoltaic detector to the charging pad;
a receiving circuit connected to the current sensing resistor to provide the data signal according to a voltage signal across the current sensing resistor;
wherein the charging plate is also used for power supply of the photovoltaic device based visible light energy-carrying communication circuit, and the optical signal comprises visible light.
2. The photovoltaic device-based visible light energy carrying communication circuit of claim 1, wherein the boost circuit comprises:
the input pin of the boost chip is the input end of the boost circuit, the enable pin of the boost chip is connected with the input pin, and the boost chip provides charging voltage output at the output pin of the boost chip;
a first inductor connected between an inductance pin and an input pin of the boost chip;
a second resistor and a third resistor which are sequentially connected in series between the output end of the boost chip and the ground, wherein the middle node of the second resistor and the third resistor is connected to the feedback pin of the boost chip;
and the second capacitor is connected between the output pin of the boosting chip and the ground.
3. The photovoltaic device-based visible light energy carrying communication circuit of claim 1, wherein the receiving circuit comprises:
an instrumentation amplifier for providing a first voltage signal based on the voltage signal across the current sense resistor;
an active band-pass filter for providing a second voltage signal according to the first voltage signal;
and the comparison circuit is used for providing the data signal according to the second voltage signal and a preset reference level signal.
4. The photovoltaic device-based visible light energy carrying communication circuit of claim 3, wherein the instrumentation amplifier comprises:
a first input pin and a second input pin of the instrument amplifier are respectively connected with two ends of the current sensing resistor;
a fourth resistor connected between an external resistance pin of the instrumentation amplifier and a reference level pin;
a fifth resistor connected between the output of the instrumentation amplifier and a reference level pin.
5. The photovoltaic device-based visible light energy carrying communication circuit of claim 3,
the active band-pass filter comprises a first-order active high-pass filter circuit and a second-order active low-pass filter circuit which are sequentially connected in series between the input end and the output end of the active band-pass filter, and the second voltage signal is provided at the output end of the active band-pass filter according to the first voltage signal received by the input end of the active band-pass filter.
6. The photovoltaic device-based visible light energy carrying communication circuit of claim 3, wherein the comparison circuit comprises:
the comparator is used for providing the data signal according to the second voltage signal and a preset reference level signal;
a tenth resistor connected between the output terminal of the comparator and a power supply.
7. The photovoltaic device-based visible light energy carrying communication circuit of claim 6, further comprising a reference level circuit for providing the reference level signal, the reference level circuit comprising:
a sixth capacitor connected between a reference level signal input terminal of the comparator and ground;
and the potentiometer is connected between a power supply and the ground in series, and the selection end of the potentiometer is connected to the reference level signal input end of the comparator.
8. The photovoltaic device-based visible light energy carrying communication circuit of claim 1,
the photovoltaic type detector comprises at least six photovoltaic components connected in series or in parallel.
9. A photovoltaic device-based visible light energy-carrying communication device, comprising:
a transmitting module for providing an optical signal output according to an input data signal;
a receiving module for obtaining an output data signal matched with the input data signal according to the optical signal provided by the transmitting module, wherein the receiving module comprises the photovoltaic device-based visible light energy-carrying communication circuit according to any one of claims 1 to 8.
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| CN116131947A (en) * | 2023-04-14 | 2023-05-16 | 南昌大学 | Visible light communication device based on photovoltaic device |
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