CN204992796U - Radio magnetic wave energy collection system based on many emission unit - Google Patents

Abstract

The utility model discloses a wireless electromagnetic wave energy collection device based on multiple transmitting units, which includes a transmitting end and a receiving end, and the receiving end includes an energy transmitting and receiving antenna connected in sequence, an LC matching circuit, a voltage doubler rectifying circuit and an energy storage battery. The receiving end also includes a receiving end microprocessor, and the receiving end microprocessor is respectively connected to the energy transmitting and receiving antenna, the LC matching circuit, the voltage doubler rectifier circuit and the energy storage battery, and the transmitting end includes a plurality of transmitting units and Multiple transmitter microprocessors, each transmitter unit is connected to its corresponding transmitter microprocessor. The utility model maximizes the energy power collected by the receiving end through antenna communication and energy transmission and reception, can be applied to existing equipment conditions, and has a simple structure.

Description

A wireless electromagnetic wave energy harvesting device based on multiple transmitting units

technical field

The utility model belongs to the field of the Internet of Things, in particular to a wireless electromagnetic wave energy collection device based on multiple transmitting units.

Background technique

The emergence of wireless energy harvesting technology has made the wireless power supply of IoT nodes a reality. Wireless power supply to IoT nodes is realized through wireless energy harvesting technology, avoiding the trouble of laying power lines or replacing batteries, making the deployment of IoT nodes more convenient, with higher deployment density, more applicable scenarios, longer working life, and greatly Increased safety and convenience of use.

At present, the wireless charging technologies mainly include electromagnetic induction, magnetic field resonance and radio wave.

The electromagnetic induction type uses a pair of coils to transmit and receive current. The primary coil passes through a certain frequency of alternating current, and generates a certain current in the secondary coil through the principle of electromagnetic induction, thereby transferring energy from the transmission end to the receiving end, which belongs to the short distance Inductive coupling, the charging distance is very short.

The magnetic field resonance type is composed of an energy transmitting device and an energy receiving device, so that the two devices resonate at a certain frequency and exchange energy with each other, but there are high requirements for the exchange distance and coil size. Once the transmitting and receiving nodes are changed If the distance between them is changed or the size of the coil is changed, the received power will drop sharply, and the application has its own limitations.

The wireless electromagnetic wave type mainly adopts radio frequency technology and consists of a microwave transmitting device and a microwave receiving device. Similar to wireless communication technology, not only information can be sent and received through the antenna, but energy can also be sent and received. The wireless electromagnetic wave type can realize long-distance wireless charging, but compared with the electromagnetic induction type and the magnetic field resonance type, due to the transmission loss of electromagnetic waves, the energy collected by the receiving node is weak, and there are also leakage and low reception efficiency during the energy receiving process. factors, the scope of application is very limited.

Utility model content

In order to overcome the shortcomings and deficiencies of the existing wireless electromagnetic wave energy collection technology, the utility model provides a wireless electromagnetic wave energy collection device based on multiple transmitting units, which can maximize the received wireless energy without increasing the total transmission power. High power, to achieve long-distance wireless energy charging.

The utility model adopts the following technical solutions:

A wireless electromagnetic wave energy collection device based on multiple transmitting units, including a transmitting end and a receiving end, the receiving end includes an energy transmitting and receiving antenna connected in sequence, an LC matching circuit, a voltage doubler rectifier circuit and an energy storage battery, and the receiving end also includes It includes a receiving-end microprocessor for allocating communication time slots to each transmitting unit, receiving training sequences and calculating weights of each transmitting unit. and the energy storage battery are connected to each other, the transmitting end includes a plurality of transmitting units and a plurality of transmitting end microprocessors for adjusting the initial state of the transmitting unit through the information fed back by the receiving end, each transmitting unit and its corresponding transmitting end microprocessor connected to each other.

The transmitting unit is an independent single-antenna radio frequency transmitting device or an antenna transmitting unit in a multi-antenna radio frequency transmitting device.

The microprocessor at the receiving end and the microprocessor at the transmitting end are single-chip microcomputers or digital signal processors.

A collection method of a wireless electromagnetic wave energy collection device, including a preparation stage and an energy sending and receiving stage, specifically:

The preparation phase includes:

S1 The microprocessor at the receiving end allocates communication time slots t ₁ ... t _d to each transmitting unit;

The S2 transmitting unit transmits the training sequence X ₁ ... X _d to the receiving end within the communication time slot;

The microprocessor at the receiving end of S3 receives the training sequence, and obtains the channel fading from each transmitting unit to the receiving end through calculation and processing, and calculates the weight ω ₁ ...ω _d of each channel according to the calculation, and feeds back to each transmitting unit;

S4 The microprocessor of each transmitting unit adjusts the initial state of the emitted electromagnetic wave according to the weight information fed back, and the initial state includes phase and amplitude; the method is that the microprocessor of each transmitting unit calculates according to the weight information fed back by the transmitter Or query the lookup table to get the amplitudes of the I and Q channels, and then multiply the amplitudes of the I and Q channels by D/A conversion and multiply them with the two orthogonal carriers, and then superimpose them, so as to realize the adjustment of the electromagnetic wave emission The purpose of the initial state such as phase offset and amplitude, which includes phase and amplitude.

Each transmitting unit of S5 transmits electromagnetic waves with the phase and amplitude calculated by S4, and the energy received by the receiving end is theoretically the largest at this time.

Every once in a while, the receiving end fine-tunes the initial state of electromagnetic waves emitted by each transmitting unit, and if the receiving power does not increase during the fine-tuning process, it is judged that the power of the wireless energy at the receiving end has reached the maximum.

When the relative position of the transmitting end and the receiving end changes, or the time from the last weight calculation exceeds a certain threshold, or the interference is obvious, re-enter the weight calculation.

Both the transmitting unit and the receiving end of the utility model have a microprocessor, and the microprocessor at the receiving end forms a whole by calculating and scheduling each radio frequency transmitting end, and then realizes that each transmitting unit in a specific time slot transmits in its respective assigned time slot In the training series, the microprocessor of the transmitting unit adjusts the initial state of the transmitted electromagnetic wave by calculation or table query through the weight information fed back by the receiving end. The initial state includes power and phase, so that the electromagnetic waves emitted by each radio frequency transmitting end reach the receiving end When , when the total transmission power is constant, the total power received by the receiving end is the largest, that is, the energy harvesting efficiency is the best.

The beneficial effects of the utility model:

The utility model maximizes the energy power collected by the receiving end through antenna communication and energy transmission and reception, can be applied to existing equipment conditions, and has a simple structure.

Description of drawings

Fig. 1 is a block diagram of device structure of the present utility model;

Fig. 2 is the working flowchart of the method of the present utility model.

detailed description

The utility model will be described in further detail below in conjunction with the embodiments and accompanying drawings, but the implementation of the utility model is not limited thereto.

Example

As shown in Figure 1, a method and device for wireless energy collection based on multiple transmitting units, the device part includes a transmitting end and a receiving end, the transmitting end transmits electromagnetic waves through radio frequency, and the receiving end receives electromagnetic wave energy through an antenna and stores it .

The receiving end includes an energy transmitting and receiving antenna, an LC matching circuit, a voltage doubler rectifier circuit and an energy storage battery connected in sequence, and the receiving end also includes a microprocessor, which is respectively connected with the energy transmitting and receiving antenna, the LC matching circuit, the voltage doubler rectifying circuit and the energy storage battery. The energy storage batteries are connected to each other, and the transmitting end includes a plurality of transmitting units and a plurality of transmitting end microprocessors. interconnected.

In this embodiment, the transmitter includes a transmitter unit 1 , a transmitter unit 2 . . . a transmitter unit d, and transmitter microprocessors 1 , 2 .

The transmitting unit may be an independent single-antenna radio frequency transmitting device, or may be multiple antenna transmitting units of a multi-antenna radio frequency transmitting device. The transmitting unit is manufactured by the manufacturer in strict accordance with the safe transmitting frequency band stipulated by the state. Receiving end and transmitting end microprocessor can be the single-chip microcomputer of low power consumption class or digital signal processor (DSP), can select the microcontroller of TI company MSP430 series as the utility model, can be in the use under low power consumption mode, make Electromagnetic energy is fully stored.

As shown in Figure 2, the specific acquisition method of the device is as follows, including two stages, namely the preparation stage and the energy sending and receiving stage;

The preparation stage is specifically as follows: the system first assigns a communication time slot to each transmitting unit, respectively t ₁ ...t _d , which is similar to the basic principle of time division multiplexing (TDM), and the purpose is to make different transmitting units, The training sequence X ₁ ... X _d can be transmitted to the receiving end in different time slots. The training sequence is a sequence known to both ends of the transceiver. The role of the training sequence is to obtain accurate synchronization, phase offset correction and channel estimation. Make the sending and receiving ends be in the ready state or the energy sending and receiving state at the same time. After the receiving end receives the training sequence, the microprocessor performs channel estimation and calculates the weight information such as the phase offset ω ₁ ... ω _d of each transmitting unit, and feeds back to each transmitting unit through the reverse channel. According to the weight information fed back by the transmitter, the microprocessor obtains the amplitudes of the I and Q channels by calculating or querying the lookup table, and the amplitudes of the I and Q channels are respectively orthogonal to the two channels after D/A conversion. The carriers are multiplied and then superimposed, so as to achieve the purpose of adjusting the initial state of the transmitted electromagnetic wave, such as phase offset and amplitude.

In the stage of energy transmission and reception, the transmitting unit adjusts the initial state of electromagnetic wave transmission, that is, the phase and amplitude, according to the weight information fed back by the receiving end, and the phase offset value and amplitude value of the transmitted electromagnetic wave determined in the previous stage, and then transmits. At this time, the energy power received by the receiving end can reach the maximum.

The receiving end can fine-tune the initial state of electromagnetic waves emitted by each transmitting unit at regular intervals. If the received power does not increase, it can be judged that the power of the received wireless energy has reached the maximum.

When the relative position of the transmitting end and the receiving end changes, or the time from the last weight calculation exceeds a certain threshold, or the interference is obvious, re-enter the preparation stage for weight calculation to ensure that the energy power received by the receiving end remains maximum. That is, the receiving end receives the most energy and the effect is the best.

The above-mentioned embodiment is a preferred implementation mode of the present utility model, but the implementation mode of the present utility model is not limited by the described embodiment, and any other changes, modifications, modifications, Substitution, combination, and simplification should all be equivalent replacement methods, and are all included in the protection scope of the present utility model.

Claims (3)

1. the radio magnetic wave electricity energy harvester based on multi-emitting unit, it is characterized in that, comprise transmitting terminal and receiving terminal, described receiving terminal comprises the energy dual-mode antenna connected successively, LC match circuit, voltage doubling rectifing circuit and energy-storage battery, described receiving terminal also comprises receiving terminal microprocessor, described receiving terminal microprocessor respectively with energy dual-mode antenna, LC match circuit, voltage doubling rectifing circuit and energy-storage battery are interconnected, described transmitting terminal comprises multiple transmitter unit and transmitting terminal microprocessor, the transmitting terminal microprocessor that each transmitter unit is corresponding with it is interconnected.

2. radio magnetic wave electricity energy harvester according to claim 1, is characterized in that, described transmitter unit is certain the antenna transmission unit independently in single antenna radio-frequency (RF) transmitter or multiple antennas radio-frequency (RF) transmitter.

3. radio magnetic wave electricity energy harvester according to claim 1, is characterized in that, described receiving terminal microprocessor and transmitting terminal microprocessor are single-chip microcomputer or digital signal processor.