CN106340173A - Self-energized wireless sensing technology and wireless sensing system thereof - Google Patents

Abstract

The invention discloses a self-powered wireless sensing technology, which includes reflecting and receiving radio waves, and dividing them into two parts for transmission; receiving, processing and analyzing the first part of radio waves, obtaining and sending a wake-up signal; The two parts of radio waves are demodulated separately to obtain read and write instructions, and frequency mixing and difference frequency modulation reflect radio waves to obtain modulated signals; read the sensing information in the sensor or memory according to the wake-up signal and read and write instructions; The sensing information is modulated onto the reflected radio wave modulation signal to obtain and send node signals; the wireless sensor system includes a transceiver antenna for transmitting radio waves, a first processing module, a second processing module, a digital logic circuit and a transceiver switch. The present invention The provided self-powered wireless sensing technology and its wireless sensing system have the characteristics of small size, low power consumption, wide application range, no need for batteries, and continuous and stable energy supply.

Description

Self-powered wireless sensor technology and its wireless sensor system

technical field

The invention relates to the technical field of wireless sensing, in particular to a self-powered wireless sensing technology and a wireless sensing system thereof.

Background technique

At present, the erection of ubiquitous sensor networks faces many difficulties and challenges, and due to the large number of network nodes, it is not suitable for laying lines. Therefore, low-power circuits and batteries are generally used; For a long time, but there is still the problem of insufficient energy, and the installation of batteries at the same time will make a single node larger in size and difficult to control the cost; Sensing systems are an increasing research focus.

Contents of the invention

In view of the above-mentioned shortcomings in the prior art, the self-powered wireless sensing technology and its wireless sensing system provided by the present invention have the characteristics of small size, wide application range, no need for batteries, and continuous and stable energy supply.

In order to achieve the above-mentioned purpose of the invention, the technical solution adopted in the present invention is to provide a self-powered wireless sensor technology, which includes the following steps:

S1: Reflect, receive radio waves, and divide them into two parts for transmission;

S2: Process and analyze the first part of radio waves, obtain and send a wake-up signal;

S3: Demodulate the second part of the radio waves to obtain read and write instructions, and frequency mixing and difference frequency modulation to obtain transmitted radio waves containing modulated signals;

S4: Read the sensing information in the sensor according to the wake-up signal and read and write instructions;

S5: Modulate the sensing information onto the modulated signal of the transmitted radio wave to obtain the node signal;

S6: Transmit node signal.

Further, radio waves are received and reflected by the transceiver antenna.

Further, the processing analysis is rectifying the radio waves to obtain a DC voltage, and comparing the DC voltage with a predetermined threshold; if the DC voltage exceeds the predetermined threshold, a wake-up signal is sent.

Further, the transmission of the node signal is realized through the backscattering of the transceiver antenna.

Further, the radio wave includes one or more of WIFI, Bluetooth, ZigBee, radio frequency and microwave.

A wireless sensor system, which includes a transceiver antenna, used to send and receive and reflect radio waves; a first processing module, which processes and analyzes radio waves, obtains and sends wake-up signals; a second processing module, respectively demodulates radio waves , to obtain read and write instructions, and frequency mixing and difference frequency modulation to obtain transmitted radio waves containing modulated signals;

The digital logic circuit is respectively connected with the first processing module, the second processing module and at least one sensor, reads the sensing information in the sensor according to the wake-up signal and the read and write instructions, and modulates the sensing signal into a modulated signal for emitting radio waves on, to obtain the node signal; the transceiver switch is connected to the transceiver antenna, the digital logic circuit and the ground terminal respectively, and is used to switch the transceiver state of the transceiver antenna.

Further, the first processing module includes a radio frequency capture circuit, a rectification circuit and a wake-up circuit connected in sequence; wherein, a predetermined threshold is stored in the wake-up circuit, and the DC voltage rectified by the rectification circuit is compared with the predetermined threshold through the wake-up circuit; If the DC voltage exceeds the predetermined threshold, a wake-up signal is sent to the digital logic circuit to drive the digital logic circuit to start.

Further, the second processing module includes a receiver, a demodulation circuit, an AD conversion circuit and a mixer; the receiver is connected to the demodulation circuit and the mixer respectively, the demodulation circuit is connected in series with the AD conversion circuit, and the AD conversion circuit is connected in series with the AD conversion circuit The mixers are all connected to digital logic circuits.

Further, a filter and an amplifying circuit are sequentially arranged on the connection lines between the receiver, the demodulation circuit and the mixer.

Further, the radio wave is WIFI.

The beneficial effects of the present invention are: the self-powered wireless sensing technology and its wireless sensing system process radio waves step by step, one part is used for power supply, and the other part is used for communication, so that the sensor can operate without batteries, etc. It works with an additional power supply, has a wide range of applications, effectively reduces the size of a single node, has low energy consumption, and solves a series of problems caused by the unsustainable supply of energy; and performs mixing and difference frequency on radio waves Non-linear modulation, can form a stable and reliable frequency required by the receiving equipment, and ensure the high efficiency of communication.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the application and constitute a part of the application. In these drawings, the same reference numerals are used to indicate the same or similar parts. The illustrative embodiments of the application and their descriptions are used The purpose of explaining this application does not constitute an improper limitation of this application.

Figure 1 is a schematic diagram of the structure of the wireless sensor system.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiment is only one embodiment of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

For the sake of simplicity, common technical knowledge known to those skilled in the art is omitted in the following content.

As shown in Figure 1, the self-powered wireless sensing technology specifically includes the following steps:

S1: Reflect and receive radio waves, and divide them into two parts for transmission; one part is used for energy supply, and the other part is used for communication, so that the sensor can work without additional power such as batteries, effectively reducing the The volume of a single node is reduced, which solves a series of problems caused by the unsustainable supply of energy; in the specific implementation, the radio wave is received by the transceiver antenna, which can reflect and receive radio waves of multiple frequencies at the same time, and the transceiver antenna receives from the radio wave The small amount of energy captured is used to drive the system to full operation.

Radio waves include one or more of WIFI, Bluetooth, ZigBee, radio frequency and microwave, and can also use multiple frequency bands at the same time, such as radio frequency signal power supply, WIFI signal communication; in modern life, radio waves have been flooding around us , and will not be affected by day and night, wind and rain, etc., using radio waves as the driving energy to ensure the stability and continuity of energy supply.

S2: Process and analyze the first part of the radio wave, obtain and send a wake-up signal; wake up the circuit connected to it to work through the wake-up signal, in the specific implementation, the process of processing and analysis is to rectify the radio wave to obtain a DC voltage , and compare the DC voltage with a predetermined threshold; if the DC voltage exceeds the predetermined threshold, a wake-up signal is sent.

In actual operation, various radio waves can be rectified to obtain different DC voltages, and the DC voltage is compared with the predetermined threshold of various radio waves; if the DC voltage exceeds the predetermined threshold, the corresponding wake up signal.

S3: Demodulate the second part of the radio waves to obtain read and write instructions, and frequency mixing and difference frequency modulation to obtain the transmitted radio waves containing modulated signals; Linear modulation can form a stable and reliable frequency required by the receiving equipment, ensuring high communication efficiency.

S4: Read the sensing information in the sensor according to the wake-up signal and read and write instructions, and quickly and effectively get the information people need from the sensor.

S5: Modulate the sensing information onto the modulated signal of the transmitted radio wave to obtain the node signal; in specific implementation, the modulated node signal can be demodulated in other wireless receiving devices and obtain the data of this node to realize signal communication .

S6: Transmit node signals. In the specific implementation, the transmission of node signals is realized through the backscattering of the transceiver antenna, which greatly reduces the energy consumption of the circuit; in actual operation, other low-power devices can also be used for communication, such as using Low-power LEDs provide feedback in the form of light signals.

A wireless sensor system based on the above-mentioned self-powered wireless sensor technology, which includes a transceiver antenna for sending and receiving and reflecting radio waves, in a specific implementation, it can send and receive and reflect radio waves of multiple frequencies; the first processing module , process and analyze the radio waves, obtain and send wake-up signals; the second processing module demodulates the radio waves respectively, obtains read and write instructions, and performs frequency mixing and difference frequency modulation to obtain transmitted radio waves containing modulated signals;

The digital logic circuit is respectively connected with the first processing module, the second processing module and at least one sensor, reads the sensing information in the sensor according to the wake-up signal and the read and write instructions, and modulates the sensing signal into a modulated signal for emitting radio waves on, to obtain the node signal; the transceiver switch is connected to the transceiver antenna, the digital logic circuit and the ground terminal respectively, and is used to switch the transceiver state of the transceiver antenna.

In the specific implementation, when receiving radio waves and processing the radio waves, the transceiver switch is in the ground state; when the sensing signal is modulated onto the modulated signal of the transmitted radio waves, the digital logic circuit sends control information to the transceiver switch, The transceiver switch is switched, and the transceiver switch is connected with the digital logic circuit, so that the transceiver antenna is in a transmitting state for transmitting node signals.

The wireless sensor system processes the radio waves step by step, one part is used for energy supply, and the other part is used for communication, so that the sensor can work without additional power such as batteries, and has a wide range of applications, effectively reducing the The volume of a single node is reduced, and a series of problems caused by the unsustainable supply of energy are solved; and non-linear modulation such as frequency mixing and difference frequency is performed on radio waves, which can form a stable and reliable frequency required by receiving equipment, ensuring communication efficient.

The first processing module includes a radio frequency capture circuit, a rectification circuit, and a wake-up circuit connected in sequence; wherein, a predetermined threshold is stored in the wake-up circuit, and the DC voltage rectified by the rectification circuit is compared with the predetermined threshold through the wake-up circuit; if the DC voltage When the threshold is exceeded, a wake-up signal is sent to the digital logic circuit to drive the digital logic circuit to start; if the DC voltage is lower than the predetermined threshold, the digital logic circuit remains inactive to save power.

The second processing module includes a receiver, a demodulation circuit, an AD conversion circuit and a mixer; the receiver is connected to the demodulation circuit and the mixer respectively, the demodulation circuit is connected in series with the AD conversion circuit, and the AD conversion circuit is connected in series with the mixer Both are connected with digital logic circuit.

In the specific implementation, a filter and an amplifying circuit are sequentially arranged on the connection line between the receiver, the demodulation circuit and the mixer, and the radio wave is filtered and amplified, so as to avoid the interference of clutter signals and ensure the communication between nodes. efficient.

The radio wave of the wireless sensor system is WIFI. In the specific implementation, the WIFI signal is used as the radio wave for communication and energy supply. For the laying of ubiquitous sensor network.

In a specific implementation, when the transceiver antenna receives the WIFI signal, a part of the WIFI signal is obtained by the radio frequency capture circuit in the first processing module, and rectified by the rectifier circuit to obtain a DC voltage, and then compared with the DC voltage by the wake-up circuit, if When the DC voltage exceeds a predetermined threshold, the digital logic circuit is awakened and starts to work; otherwise, the digital logic circuit remains in a non-working state to save power.

The other part of the WIFI signal is received by the receiver, filtered and amplified by the filter and the amplifier circuit; then the WIFI signal is demodulated and AD converted by the demodulation circuit and the AD conversion circuit to obtain the read and write instructions in the WIFI signal, and The read and write instructions are sent to the digital logic circuit for signal processing including storing data and reading sensors.

The filtered and amplified WIFI signal passes through the mixer for nonlinear modulation such as frequency mixing and difference frequency to form a modulated signal of the frequency required by the receiving device, and passes through the digital logic circuit to modulate the sensing signal to the transmitting radio The node signal is obtained from the modulated signal of the wave; at this time, the digital logic circuit sends control information to the transceiver switch, switches the transceiver switch, and makes the transceiver switch communicate with the digital logic circuit, so that the transceiver antenna is in the transmitting state and transmits the node signal.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Accordingly, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A self-powered wireless sensing technology, characterized in that, comprising S1: Reflect, receive radio waves, and divide them into two parts for transmission; S2: Process and analyze the radio wave described in the first part, obtain and send a wake-up signal; S3: Demodulate the radio waves mentioned in the second part to obtain read and write instructions, and frequency mixing and difference frequency modulation to obtain transmitted radio waves containing modulated signals; S4: Read the sensing information in the sensor according to the wake-up signal and the read and write instructions; S5: Modulate the sensing information onto the modulated signal of the transmitted radio wave to obtain a node signal; S6: Transmit the node signal. 2. The self-powered wireless sensing technology of claim 1, wherein the radio waves are received and reflected by a transceiver antenna. 3. The self-powered wireless sensor technology according to claim 1, characterized in that: the processing and analysis is to rectify the radio wave to obtain a DC voltage, and compare the DC voltage with a predetermined threshold; If the DC voltage exceeds a predetermined threshold, a wake-up signal is sent. 4. The self-powered wireless sensor technology according to claim 1, characterized in that: the transmission of the node signal is realized by backscattering of the transceiver antenna. 5. The self-powered wireless sensor technology according to claim 1, wherein the radio waves include one or more of WIFI, Bluetooth, ZigBee, radio frequency and microwave. 6. A wireless sensor system based on the self-powered wireless sensor technology according to any one of claims 1 to 5, characterized in that it comprises: Transceiver antennas for sending, receiving and reflecting radio waves; The first processing module processes and analyzes the radio wave, obtains and sends a wake-up signal; The second processing module demodulates the radio waves respectively to obtain read and write instructions, and frequency mixing and difference frequency modulation to obtain transmitted radio waves containing modulated signals; A digital logic circuit is connected to the first processing module, the second processing module and at least one sensor respectively; reads the sensing information in the sensor according to the wake-up signal and the read and write instructions, and modulates the sensing signal to On the modulated signal of the transmitted radio wave, a node signal is obtained; The transceiver switch is respectively connected to the transceiver antenna, the digital logic circuit and the ground terminal, and is used to switch the transceiver state of the transceiver antenna. 7. The wireless sensor system according to claim 6, characterized in that: the first processing module comprises a sequentially connected radio frequency capture circuit, a rectification circuit and a wake-up circuit; wherein, a predetermined threshold is stored in the wake-up circuit, through The wake-up circuit compares the DC voltage rectified by the rectifier circuit with a predetermined threshold; if the DC voltage exceeds the predetermined threshold, it sends a wake-up signal to the digital logic circuit to drive the digital logic circuit to start. 8. The wireless sensor system according to claim 6, characterized in that: the second processing module includes a receiver, a demodulation circuit, an AD conversion circuit and a mixer; The circuit is connected to a mixer, the demodulation circuit is connected in series with the AD conversion circuit, and the AD conversion circuit in series and the mixer are both connected to the digital logic circuit. 9. The wireless sensor system according to claim 8, characterized in that: a filter and an amplifying circuit are sequentially arranged on the connection line between the receiver, the demodulation circuit and the mixer. 10. The wireless sensor system according to claim 6, characterized in that: the radio wave is WIFI.