WO2022257434A1 - Wireless power transfer receiving device, and wireless power transfer signal receiving method - Google Patents

Abstract

The present application provides a wireless power transfer receiving device, comprising a power distribution module which receives a baseband signal sent by a wireless power transfer emitting device, performs power distribution on the baseband signal according to a power distribution coefficient, and outputs a first distribution signal and a second distribution signal; a control module which is connected to the power distribution module and adjusts the power distribution coefficient of the power distribution module in real time by adjusting operation parameters of the power distribution module when the wireless power transfer receiving device is in use; a power collection module which is respectively connected to the power distribution module and the control module and collects power from the first distribution signal under the control of the control module; and an information demodulation module which is respectively connected to the power distribution module and the control module and demodulates the second distribution signal under the control of the control module. The present application further provides a wireless power transfer signal receiving method which is applied to the wireless power transfer receiving device.

Description

Wireless energy-carrying receiving device and wireless energy-carrying signal receiving method

Cross References to Related Applications

This application claims the priority of the Chinese application titled "Wireless energy-carrying receiving device and wireless energy-carrying signal receiving method" submitted on June 10, 2021, with application number 2021106458992, the disclosure of which is fully incorporated by reference in this application middle.

technical field

The present application relates to the technical field of wireless energy carrying communication, in particular to a wireless energy carrying receiving device and a wireless energy carrying signal receiving method.

Background technique

Wireless portable energy communication technology is a research hotspot in recent years. Wireless energy-carrying communication technology not only involves wireless information transmission (Wireless Information Transmission, WIT) technology, but also combines wireless power transfer (Wireless Power Transfer, WPT) technology, so that the radio frequency beam emitted by the system transmitter can carry information and energy at the same time .

In order to be able to collect the radio frequency signal containing both information and energy sent by the wireless energy carrying system, the design of the system receiver is extremely important. It must not only have the ability to demodulate information, but also need to have the function of collecting energy. Traditional power allocation schemes are generally difficult to adjust in real time on hardware devices, and cannot allocate received signal power in a precise proportional relationship.

Contents of the invention

The present application provides a wireless energy carrying receiving device and a wireless energy carrying signal receiving method.

A wireless energy-carrying receiving device, including a power distribution module, configured to receive a baseband signal, perform power distribution on the baseband signal according to a power distribution coefficient, and output a first distribution signal and a second distribution signal, and the baseband signal contains information and energy; the control module is connected with the power distribution module, and is used to adjust the power distribution coefficient of the power distribution module by adjusting the operating parameters of the power distribution module during the use of the wireless energy-carrying receiving device Real-time adjustment; the energy collection module is respectively connected with the power distribution module and the control module, and is used to collect energy for the first distribution signal under the control of the control module; the information demodulation module is respectively connected with the The power distribution module is connected to the control module, and is used to demodulate the second distribution signal under the control of the control module.

In one of the embodiments, the power distribution module includes a first link unit and a second link unit, the first link unit includes a plurality of controllable resistance circuits, and the second link unit also includes a plurality of a controllable resistance circuit; the input ends of each controllable resistance circuit in the first link unit are connected to the input end of the power distribution module, and the output ends of each controllable resistance circuit in the first link unit are connected to each other. Connect the output terminal of the first link unit; each controllable resistance circuit in the first link unit is also connected with the control module; the input of each controllable resistance circuit in the second link unit terminals are all connected to the input terminals of the power distribution module, and the output terminals of each controllable resistance circuit in the second link unit are connected to the output terminals of the second link unit; Each controllable resistance circuit is also connected to the control module; the input end of the power distribution module is used to receive the baseband signal; the output end of the first link unit is used to output the first distribution signal, the The output terminal of the second link unit is used to output the second allocation signal; the control module adjusts the power by controlling the resistance value in the first link unit and the resistance value in the second link unit The power distribution factor for the distribution module.

In one of the embodiments, the control module adjusts the on-off of each controllable resistance circuit in the first link unit and the on-off of each controllable resistance circuit in the second link unit. The power distribution coefficient of the power distribution module described above.

In one of the embodiments, the controllable resistance circuit includes a first resistance and a switching device, one end of the first resistance is connected to the first end of the switching device, and the other end of the first resistance is connected to the first end of the switching device. The input end of the controllable resistance circuit is connected; the second end of the switch device is connected with the control module, and the third end of the switch device is connected with the output end of the controllable resistance circuit.

In one of the embodiments, the controllable resistance circuit further includes a second resistor, one end of the second resistor is connected to the second end of the switching device, and the other end of the second resistor is connected to the connected to the control module.

In one of the embodiments, the switching device includes a bipolar junction transistor.

In one of the embodiments, the first link unit includes three controllable resistance circuits, and the second link unit also includes three controllable resistance circuits.

In one of the embodiments, the energy collection module includes a switch unit, which is respectively connected to the power distribution module and the control module, and is used to receive the first distribution signal under the control of the control module; A collector, connected to the switch unit, for collecting energy from the first distribution signal.

In one embodiment, the switch unit is a switch circuit chip, a switch transistor or a field effect transistor, and the energy collector is a capacitor.

In one of the embodiments, the information demodulation module includes: a sampling unit, respectively connected to the control module and the power distribution module, for sampling the second distribution signal to obtain sampling data; data processing A unit, connected to the sampling unit, for performing information demodulation processing on the sampling data.

A method for receiving a wireless energy-carrying signal, comprising receiving a baseband signal; the baseband signal contains information and energy; adjusting a power allocation coefficient; performing power allocation on the baseband signal according to the power allocation coefficient, and obtaining a first allocated signal and a second Two distribution signals: performing energy collection on the first distribution signal to obtain energy of the baseband signal; performing information demodulation on the second distribution signal to obtain data information of the baseband signal.

In one of the embodiments, the performing information demodulation on the second allocation signal, obtaining the information of the baseband signal includes acquiring the second allocation signal; sequentially matching the second allocation signal at the current moment filtering processing, sliding smoothing processing and bit synchronization processing to obtain the bit synchronization signal at the current moment; comparing the amplitude of the bit synchronization signal at the current moment with the judgment threshold to obtain the judgment result at the current moment; The judgment result and the judgment result at the previous time constitute judgment data, and frame header detection is performed on the judgment data; if a frame header is detected, the second allocation signal at a later time is decoded to obtain a wireless energy-carrying transmission The data information sent by the device; otherwise, acquire the next second allocation signal.

In one embodiment, Gardner algorithm is used for bit synchronization processing. Specifically, using the Gardner algorithm to perform bit synchronization processing includes: inputting the second distribution signal into an interpolation filter; inputting the second distribution signal processed by the interpolation filter into a loop filter to filter out Noise and high-frequency components in the second distribution signal; the filtered second distribution signal is sent to a digitally controlled oscillator, and the result obtained after the second distribution signal is processed by an interpolation filter Sampling is performed to calculate the integer sampling time and the interpolation point position of the interpolation filter, thereby obtaining the latest timing output, which is the bit synchronization signal; the calculation method of the integer sampling time is:

In the formula, mk is an integer sampling time, k is a positive integer, Ti is a resampling period, the ratio of the resampling period Ti to the symbol rate T of the second distribution signal is an integer, and Ts is a wireless energy-carrying receiving device The sampling clock cycle of the wireless energy-carrying receiving device is four times the symbol rate T sent by the wireless energy-carrying transmitting device. The largest integer part; the calculation method of the interpolation filter interpolation point position is:

In the formula, μ _k is the interpolation point position of the interpolation filter, k is a positive integer, T _i is the resampling cycle, T _s is the sampling clock cycle of the wireless energy-carrying receiving device, and m _k is the integer sampling moment; the timing output The calculation method is:

FI1＝0.5×x(n)-0.5×x(n-1)-0.5×x(n-2)+0.5×x(n-3)

FI2=1.5×x(n-1)-0.5×x(n)-0.5×x(n-2)-0.5×x(n-3)

FI3=x(n-2)

yI=(FI1×μ _k +FI2)×μ _k +FI3

In the formula, FI1, FI2, and FI3 are the interpolation coefficients of the interpolation filter, x(n) represents the zero-mean signal calculated at the sampling time of the current wireless energy-carrying receiving device, and x(n-1) represents the value of the wireless energy-carrying receiving device The zero-mean signal calculated before one sampling period, x(n-2) represents the zero-mean signal calculated before two sampling periods of the wireless energy-carrying receiving device, and x(n-3) represents three wireless energy-carrying receiving devices The zero-mean signal calculated at the moment before the sampling period, yI is the timing output of the interpolation filter, μ _k is the position of the interpolation point of the interpolation filter.

The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below. Other features, objects and advantages of the present application will be apparent from the description, drawings and claims.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some implementations described in this specification. Those skilled in the art can also obtain other drawings based on these drawings without any creative effort.

FIG. 1 is a schematic structural diagram of a wireless energy-carrying receiving device according to one embodiment of the present application;

FIG. 2 is a schematic structural diagram of a power distribution module according to one embodiment of the present application;

FIG. 3 is a schematic flow chart of a method for receiving a wireless energy-carrying signal according to one embodiment of the present application;

FIG. 4 is a schematic flow chart of an information demodulation process in one embodiment of the present application;

FIG. 5 is a schematic flowchart of an information demodulation process according to another embodiment of the present application;

FIG. 6 is a schematic waveform diagram of sampling data and a zero-mean signal according to one embodiment of the present application.

Detailed ways

In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Preferred embodiments of the application are given in the accompanying drawings. However, the present application can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to understand the disclosure content of this application more thoroughly and comprehensively.

It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. 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. As used herein, the terms "vertical", "horizontal", "left", "right", "upper", "lower", "front", "rear", "circumferential" and similar expressions are based on the The orientation or positional relationship shown in the figure is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be interpreted as a reference to this application. Application Restrictions.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of the application are only for the purpose of describing specific embodiments, and are not intended to limit the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Since L.R.Varshney published the article "Transporting information and energy simultaneously" in 2008, and proposed the concept of Simultaneous Wireless Information and Power Transfer (SWIPT), wireless portable communication has become a research hotspot in recent years. The wireless energy-carrying communication technology not only considers the Wireless Information Transmission (WIT) technology, but also combines the Wireless Power Transfer (WPT) technology, which enables the radio frequency beam emitted by the system transmitter to carry information and energy at the same time. .

In order to be able to collect the radio frequency signal containing both information and energy sent by the wireless energy carrying system, the design of the system receiver is extremely important. It must not only have the ability to demodulate information, but also need to have the function of collecting energy. A traditional solution is to use two sets of receiving antennas to receive signals at the same time. One set of antennas sends the received signals to the demodulation equipment. This path is called an information link; the other set of antennas sends the received signals into energy Collecting equipment, this path is called an energy link. But this method brings about the problem of energy waste, and the energy carried by the signal sent to the demodulation device will be completely wasted.

Another more popular solution is to use a group of receiving antennas to receive radio frequency signals, and then the receiving device divides the received signals into two parts according to a certain power distribution, one part flows into the information demodulation circuit, and the other part flows into the energy harvesting circuit, thus Achieving a balance between information transmission and energy harvesting. However, this solution is difficult to control in real time on hardware devices. In this solution, the resistance value of the voltage dividing resistor is pre-planned when designing the circuit of the receiving device, so that the receiving circuit can realize power distribution according to the power distribution coefficient specified in advance. Such a receiving device does not have the ability to adjust and control the power distribution of received signals in real time. Another solution is to use a sliding rheostat as a voltage dividing resistor, and manually adjust the resistance value of the sliding rheostat to realize the function of adjustable power distribution. However, the resistance value of the sliding rheostat at any time cannot be directly read out, so the power distribution coefficient at any time cannot be calculated, let alone the distribution of received signal power in a precise proportional relationship.

Aiming at the deficiencies of the prior art, this embodiment proposes a wireless energy-carrying receiving device with an adjustable power distribution function. Figure 1 is a schematic structural diagram of a wireless energy-carrying receiving device according to one embodiment of the present application. The wireless energy-carrying receiving device includes a power distribution module 100, a control module 200, an energy collection module 300 and an information demodulation module 400.

The power distribution module 100 receives the baseband signal sent by the wireless energy transmitting device, and performs power distribution on the received baseband signal according to the power distribution coefficient, and outputs a first distribution signal and a second distribution signal. In this embodiment, the above-mentioned baseband signal is a radio frequency signal containing both information and energy. The control module 200 is connected with the power distribution module 100, and the control module 200 can dynamically adjust the power distribution coefficient in the power distribution module 100, so that the power distribution coefficient of the power distribution module can be adjusted during the use of the wireless energy-carrying receiving device according to application requirements. The operating parameters are used to adjust the power distribution of the first distribution signal and the second distribution signal in real time. The energy collection module 300 is connected to the power distribution module 100 and the control module 200 respectively, and the power distribution module 100 inputs the first distribution signal into the energy collection module 300 . The energy collection module 300 can obtain the energy in the baseband signal according to the first distribution signal under the control of the control module 200 . The information demodulation module 400 is connected with the power distribution module 100 and the control module 200 , and the power distribution module 100 inputs the second distribution signal into the information demodulation module 400 . The information demodulation module 400 can acquire the data information carried in the baseband signal according to the second allocation signal under the control of the control module 200 .

The control module 200 can quantitatively adjust the power distribution coefficient of the power distribution module 100 to make the power distribution control faster and more convenient. The power distribution module 100 can distribute the power of the baseband signal in a precise proportional relationship according to the power distribution coefficient, a part of the signal is distributed to the energy collection module 300, and the other part is distributed to the information demodulation module 400, without repeated adjustments or changes already printed on the resistors on the circuit board. Using the wireless energy-carrying receiving device provided by this embodiment can achieve a balance between information transmission and energy collection, and also has the advantages of good stability and high accuracy.

FIG. 2 is a schematic structural diagram of a power distribution module according to one embodiment of the present application. In one embodiment, the power distribution module 100 includes a first link unit 110 and a second link unit 120. The first link unit Both 110 and the second link unit 120 include a plurality of controllable resistance circuits 10 . The input ends of each controllable resistance circuit 10 in the first link unit 110 are connected to the input end of the power distribution module 100, and the output ends of each controllable resistance circuit 10 in the first link unit 110 are connected to the first link unit 110 Each controllable resistance circuit 10 in the first link unit 110 is also connected to the control module 200 .

The input ends of each controllable resistance circuit 10 in the second link unit 120 are connected to the input end of the power distribution module 100, and the output ends of each controllable resistance circuit 10 in the second link unit 120 are connected to the second link unit 120 The output terminals of each controllable resistance circuit 10 in the second link unit 120 are also connected to the control module 200 .

In this embodiment, the input ends of each controllable resistance circuit 10 in the first link unit 110 are connected in parallel to form the input end of the first link unit 110, and each controllable resistance circuit 10 in the first link unit 110 The output terminals of the first link unit 110 are connected in parallel to form the output terminal V _Out1 of the first link unit 110 . Similarly, after the input ends of each controllable resistance circuit 10 in the second link unit 120 are connected in parallel, the input ends of the second link unit 120 are formed, and the output ends of each controllable resistance circuit 10 in the second link unit 120 After parallel connection, the output terminal V _Out2 of the second link unit 120 is formed. Each controllable resistance circuit 10 in the first link unit 110 and each controllable resistance circuit 10 in the second link unit 120 are connected to the control port of the control module 200 .

The power distribution module 100 includes an input terminal V _Input , and two output terminals V _Out1 and V _Out2 . The input end of the first link unit 110 and the input end of the second link unit 120 are connected in parallel to form the input end of the power distribution module 100 . The output terminal V _Out1 of the first link unit 110 is the first output terminal of the power distribution module 100 , and the output terminal V _Out2 of the second link unit 120 is the second output terminal of the power distribution module 100 .

The input terminal V _Input of the power distribution module 100 is used to receive a signal sent by a wireless energy-carrying transmitting device, and the above-mentioned signal specifically refers to a baseband signal containing information and energy. The first output terminal V _Out1 of the power distribution module 100 is connected to the energy collection module 300 to transmit the first distribution signal to the energy collection module 300 . The second output terminal V _Out2 of the power distribution module 100 is connected to the information demodulation module 400 to transmit the second distribution signal to the information demodulation module 400 .

The control module 200 realizes the connection and control of the power distribution module 100 through the control port. The control module 200 can adjust the power distribution coefficient of the power distribution module 100 by adjusting the resistance of the first link unit 110 and the resistance of the second link unit 120 . Specifically, the control module can control the on-off of each controllable resistance circuit in the first link unit (that is, whether each controllable resistance circuit is connected to the first link unit) and the second link unit The on-off of each controllable resistance circuit (that is, whether each controllable resistance circuit is connected to the second link unit) is used to adjust the power distribution coefficient of the power distribution module. When the baseband signal flows into the power distribution module 100, the control port of the control module 200 is used to select the required voltage dividing resistor, so that the wireless energy-carrying receiving device can dynamically adjust the power distribution coefficient, and realize the distribution of the first distribution signal and the second distribution signal. Arbitrary power distribution to achieve a balance between information transmission and energy harvesting.

Please refer to FIG. 2 . In one embodiment, since the power distribution module 100 includes a plurality of controllable resistance circuits 10 , the controllable resistance circuits 10 are numbered for convenience of description. The i-th controllable resistance circuit 10 includes a first resistance 11 and a switch device 12, wherein i is an integer greater than zero. The first resistor 11 is the resistor Ri in FIG. 2 , i=1, 2, 3, 4, 5, 6.

One end of the first resistor 11 is connected to the first end of the switch device 12, the other end of the first resistor 11 is connected to the input end of the controllable resistance circuit 10, and the second end of the switch device 12 is connected to the control module 200, The third terminal of the switch device 12 is connected with the output terminal of the controllable resistance circuit 10 . The switching device 12 acts as a switch in the controllable resistance circuit 10 . The control module 200 controls the switching device 12 of the i-th controllable resistance circuit 10 to turn on or off, and selects the first resistor 11 in the i-th controllable resistance circuit 10 as the voltage dividing resistor, thereby regulating the power distribution coefficient and realizing the Software control of desired power split factor.

In one embodiment, the power distribution module 100 further includes a second resistor 13, which is the resistor _RB in FIG. 2 . One end of the second resistor 13 is connected with the second end of the switching device 12, and the other end of the second resistor 13 of the i controllable resistance circuit 10 is connected with the I/Oi port of the control module 200 (the ith I/O port ) are connected, i=1, 2, 3, 4, 5, 6. In this embodiment, the resistance values of the second resistors 13 in each controllable resistance circuit 10 are equal, and the function of the second resistors 13 is to reduce the current directly flowing into the switching device 12 and protect the switching device 12 .

In one of the embodiments, a bipolar junction transistor (Bipolar Junction Transistor, BJT) is selected as the switch device 12 . Bipolar junction transistors usually work in on and off states, and are sometimes turned on and sometimes turned off under the action of a digital signal, which is equivalent to the "closed" and "opened" of the switch. Therefore, in this embodiment, the software control of the power distribution coefficient in the power distribution module 100 is realized by using the switching characteristics of the bipolar junction transistor. In this embodiment, preferably, an NPN transistor is selected as the switching device 12 . NPN type crystal triode refers to a triode composed of two N-type semiconductors with a P-type semiconductor sandwiched between them.

In this embodiment, the collector of the switching device 12 is connected to one end of the first resistor 11, the other end of the first resistor 11 is used as the input terminal of the controllable resistance circuit 10, and the emitter of the switching device 12 is used as the controllable resistance circuit 10, the base of the switching device 12 of the ith controllable resistance circuit 10 is connected in series with the second resistance 13 and connected to the I/Oi port of the control module 200, i=1, 2, 3, 4, 5 , 6. The control module 200 controls the switching device 12 of the i-th controllable resistance circuit 10 to turn on or off through the I/Oi port outputting a high level or a low level, thereby selecting the first resistor in the i-th controllable resistance circuit 10 11 as a voltage divider resistor.

In one embodiment, as shown in FIG. 2 , the power distribution module 100 includes six controllable resistance circuits 10 . The 1st, 2nd, and 3rd controllable resistance circuits 10 together form the first link unit 110 , and the 4th, 5th, and 6th controllable resistance circuits 10 together form the second link unit 120 . The emitters of the NPN transistors in the 1st, 2nd and 3rd controllable resistance circuits 10 are combined together to form the first output terminal V _Out1 , and the NPN transistors in the 4th, 5th and 6th controllable resistance circuits 10 The emitters of and together form the second output terminal V _Out2 . The first resistor Ri in the six controllable resistance circuits 10 is used as one terminal of the input terminal and together form the input terminal V _Input .

In practical applications, according to the application requirements, the baseband signal received by the input terminal V _Input can be divided into the first distribution signal and the second distribution signal of any power, which are transmitted to the energy harvesting through the output terminal V _Out1 and output terminal V _Out2 respectively. Module 300 and information demodulation module 400. The I/Oi port of the control module 200 outputs a high level or a low level to control the turn-on or cut-off of the i-th NPN transistor, so that the required first resistor Ri can be selected as a voltage dividing resistor on the software, Enables software control of the desired power split factor. Wherein, i=1, 2, 3, 4, 5, 6.

In one of the embodiments, the power distribution coefficient is the ratio of the resistance value of the controllable resistance circuit 10 turned on in the first link unit 110 to the resistance value of the controllable resistance circuit 10 turned on in the second link unit 120 . In this embodiment, one specific method of setting the power distribution coefficient is taken as an example for illustration, but it should not be understood as a limitation on the scope of the patent application. When the control module 200 makes I/O2 and I/O4 ports (the second and fourth I/O ports) output high level, I/O1, I/O3, I/O5 and I/O6 (the first , the 3rd, 5th, 6th I/O ports) outputs low level, that is, at this time, the first resistors R ₂ and R ₄ of the 2nd and 4th controllable resistance circuits 10 are selected as points Piezoresistance. At this time, the ratio of the first output terminal V _Out1 to the second output terminal V _Out2 is V _Out1 /V _Out2 = R ₂ /R ₄ , which realizes the power distribution of the input baseband signal in proportion to R ₂ /R ₄ .

In one of the embodiments, a controller, such as an MCU (Microcontroller Unit, micro control unit) is used to realize the control function of the control module 200. The MCU realizes the connection and control of the software controllable resistance through the I/O port. When the power distribution module 100 receives the baseband signal, the MCU selects the first resistor Ri of the i-th controllable resistance circuit 10 as a voltage dividing resistor by controlling the i-th I/O port to output a high level/low level, In this way, the controllable power distribution of the baseband signal is realized, one part of the signal is distributed to the energy link, and the other part of the signal is distributed to the information link.

In one of the embodiments, the energy harvesting module 300 includes a switch unit and an energy harvester. The switch unit is connected to the control module 200 and the first output terminal V _Out1 of the power distribution module 100 , and the first distribution signal distributed to the energy link flows into the switch unit controlled by the MCU. In this embodiment, the switch unit may be a dedicated switch circuit chip, or a device with a switch function, such as a switch triode, a field effect transistor, and the like. The energy harvester is connected with the switch unit and is used for energy harvesting of the first distribution signal. When the MCU controls the switch circuit to be in an open (conducting) state, the first distribution signal flows into the energy harvester through the switch unit. In this embodiment, the energy harvester is generally a capacitor with energy storage function.

In one of the embodiments, the information demodulation module 400 includes a sampling unit and a data processing unit. The sampling unit is connected to the control module 200 and the second output terminal V _Out2 of the power distribution module 100 respectively, and the second distribution signal distributed to the information link flows into the sampling unit controlled by the MCU. In this embodiment, the sampling unit may be a dedicated sampling chip, or a pin with a sampling function of the MCU may be used to implement sampling of the information link signal. The data processing unit is connected with the sampling unit, and is used for storing and demodulating the sampling data. In this embodiment, the data processing unit may be a chip dedicated to storage and information demodulation, or may store the sampled data in the MCU, and perform information demodulation processing in the MCU.

In addition to the need to be able to adjust the power allocation coefficient in real time, the wireless energy-carrying receiving device also requires the information demodulation device to have good real-time performance and accuracy. However, chips that can demodulate real-time information generally have large power consumption and complex external circuits, such as dedicated FPGAs; and low-power MCUs such as 51 single-chip microcomputers, STM32, etc. need to realize real-time demodulation of information. There is a demodulation program with low time complexity and low space complexity, which has great difficulties in program logic design.

The above-mentioned wireless energy-carrying receiving device uses a power allocation module to receive the baseband signal sent by the wireless energy-carrying transmitting device, and performs power allocation on the baseband signal according to the power allocation coefficient. The power distribution coefficient is dynamically adjusted by the control module, so that the power distribution of the first distribution signal and the second distribution signal can be adjusted in real time according to application requirements during the use of the wireless energy-carrying receiving device. The first distribution signal is input to the energy collection module, and the energy collection module obtains energy in the baseband signal according to the first distribution signal. The second distribution signal is input to the information demodulation module, and the information demodulation module obtains the information in the baseband signal according to the second distribution signal. The control module can quantitatively adjust the power distribution coefficient, making the power distribution control faster and more convenient. The power distribution module can distribute the power of the baseband signal in a precise proportional relationship according to the power distribution coefficient, without repeatedly adjusting or changing the resistors printed on the circuit board. Using the wireless energy-carrying receiving device provided by this application can achieve a balance between information transmission and energy collection, and also has the advantages of good stability and high accuracy.

In this application, the above "module" and "unit" can be realized by dedicated hardware, such as electronic circuits. Therefore, for example, the above-mentioned power distribution module, energy collection module, information demodulation module, first link unit, second link unit, switch unit and sampling unit may also be referred to as power distribution circuit, energy collection circuit, Information demodulation circuit, first link circuit, second link circuit, switch circuit and sampling circuit.

In view of the above problems, the present application also provides a method for receiving a wireless energy-carrying signal, which is applied to the wireless energy-carrying receiving device described in any one of the above embodiments. FIG. 3 is a schematic flowchart of a method for receiving a wireless energy-carrying signal according to an embodiment of the present application. The method for receiving a wireless energy-carrying signal includes the following steps S100 to S500.

Step S100: Receive a baseband signal; the baseband signal contains information and energy.

The power distribution module 100 receives the baseband signal sent by the wireless energy transmitting device, and performs power distribution on the received baseband signal according to the power distribution coefficient. Wherein, the baseband signal is a radio frequency signal containing both information and energy.

Step S200: Adjust the power allocation coefficient.

The control module 200 realizes the connection and control of the power distribution module 100 through the control port. The control module 200 can adjust the power distribution coefficient of the power distribution module 100 by adjusting the resistance value of the first link unit 110 and the resistance value of the second link unit 120, so that the power distribution coefficient of the power distribution module 100 can be adjusted according to the application requirements During use, the operating parameters of the power distribution module are adjusted to adjust the power distribution of the first distribution signal and the second distribution signal in real time.

Step S300: Perform power allocation on the baseband signal according to the power allocation coefficient, and acquire a first allocated signal and a second allocated signal.

When a baseband signal flows into the power distribution module 100, the control module 200 selects the required voltage dividing resistor in the power distribution module 100 through the control port, so that the wireless energy-carrying receiving device can dynamically adjust the power distribution coefficient to realize the first distribution. Arbitrary power distribution of the signal and the second distribution signal, thereby achieving a balance between information transmission and energy harvesting.

Step S400: Perform energy collection on the first distribution signal to obtain the energy of the baseband signal.

The energy collection module 300 is connected to the power distribution module 100 and the control module 200 respectively, and the power distribution module 100 inputs the first distribution signal into the energy collection module 300 . The energy collection module 300 can obtain the energy in the baseband signal according to the first distribution signal under the control of the control module 200 . The first distribution signal distributed to the energy link flows into the switch unit controlled by the MCU, and the energy harvester is connected with the switch unit to collect energy for the first distribution signal. When the MCU controls the switch circuit to be in an open (conducting) state, the first distribution signal flows into the energy harvester through the switch unit.

Step S500: Perform information demodulation on the second distribution signal to obtain data information of the baseband signal.

The information demodulation module 400 is connected with the power distribution module 100 and the control module 200 , and the power distribution module 100 inputs the second distribution signal into the information demodulation module 400 . The information demodulation module 400 can acquire the data information carried in the baseband signal according to the second allocation signal under the control of the control module 200 . The second distribution signal assigned to the information link flows into the sampling unit controlled by the MCU, and the sampling function of the MCU can be used to realize the sampling of the information link signal. Store the sampled data in the MCU, and perform information demodulation processing in the MCU.

The control module 200 can quantitatively adjust the power distribution coefficient of the power distribution module 100, so that the power distribution control is faster and more convenient. The power distribution module 100 can distribute the power of the baseband signal in a precise proportional relationship according to the power distribution coefficient, a part of the signal is distributed to the energy collection module 300, and the other part is distributed to the information demodulation module 400, without repeated adjustments or changes already printed on the resistors on the circuit board. Using the wireless energy-carrying receiving device provided by this embodiment can achieve a balance between information transmission and energy collection, and also has the advantages of good stability and high accuracy. At the same time, applying the information demodulation step on the MCU with low power consumption can reduce the time complexity and space complexity of information demodulation calculation, and realize real-time demodulation of information.

FIG. 4 is a schematic flowchart of an information demodulation process in one embodiment of the present application, and FIG. 5 is a schematic flowchart of an information demodulation process in another embodiment of the present application. In one of the embodiments, performing information demodulation on the second distribution signal, and acquiring information of the baseband signal includes the following steps S410 to S460.

Step S410: Obtain a second distribution signal.

The power distribution module 100 performs power distribution on the baseband signal according to the power distribution coefficient, and inputs the obtained second distribution signal into the information demodulation module 400 for information demodulation processing.

Step S420: sequentially perform matched filter processing, sliding smoothing processing, and bit synchronization processing on the second distribution signal at the current moment to obtain a bit synchronization signal at the current moment.

Matching filter processing, sliding smoothing processing and bit synchronization processing are sequentially performed on the data of the second distribution signal acquired in real time, respectively, to obtain the bit synchronization signal at the current moment.

In this embodiment, the data of the second distribution signal is input into the matched filter for filtering processing. The function of the matched filter is to improve the signal-to-noise ratio of the second distribution signal, and the design of the matched filter coefficients can be obtained through simulation software. Store the filtered data into the sliding data, and calculate the average value of the sliding data for sliding smoothing. The sliding data is a collection of filtered data at the current moment and the previous 255 filtered data, with a total of 256 data points. After the moving average is obtained, the data processed by the matched filter is compared with the mean value to obtain a zero-mean signal. Send the zero-mean signal into the bit synchronization algorithm for bit synchronization processing to obtain the bit synchronization signal.

Step S430: Comparing the amplitude of the bit synchronization signal at the current moment with the decision threshold to obtain the decision result at the current moment.

The bit synchronization signal is judged, that is, the amplitude of the bit synchronization signal at the current moment is compared with the judgment threshold. In this embodiment, the value of the decision threshold is set to 0. When the amplitude of the bit synchronization signal is greater than 0, the output is set to 1; when the amplitude of the bit synchronization signal is less than or equal to 0, the output is set to 0.

Step S440: Combine the decision result at the current moment and the decision result at the previous moment to form decision data, and perform frame header detection on the decision data.

After each judgment is completed, the judgment result at the current moment and the judgment result at the previous moment are combined into a judgment data, the length of the judgment data is the same as the data length of a frame header, and the frame header detection is performed on the judgment data.

Step S450: If the frame header is detected, decode the second allocation signal at a later time to obtain the data information sent by the wireless energy-carrying transmitting device.

When the frame header is detected in the judgment data, the subsequent input sampling data stream can be calculated to obtain the frame length of the sending information. After obtaining the frame length, the subsequent input sampling data stream can be decoded to obtain the wireless power transmission data sent by the machine.

Step S460: otherwise, acquire the next second allocation signal.

When the frame header is not detected, it will jump to step S410 to acquire the next input new sampling data and repeat the information demodulation process of steps S420 to S450.

When the above information demodulation steps are used to implement the information demodulation process on the second distribution signal, the time complexity and space complexity required for the calculation are low, so it can be run on the MCU. By adopting the above information demodulation steps on the low-power MCU, real-time demodulation of the second allocation information can be realized.

In one embodiment, Gardner algorithm is used for bit synchronization processing. The Gardner algorithm is a bit synchronization algorithm based on interpolation, which realizes sampling at the extreme value by changing the input signal, and uses the interpolation filter to recover the maximum value of the signal before resampling. The Gardner bit synchronization algorithm only needs the latest 4 sampling period zero-mean signals as input each time, so the time required to complete a bit synchronization can be greatly shortened.

The Gardner bit synchronization algorithm requires that the sampling rate of the wireless energy-carrying receiving device is four times the symbol rate T sent by the wireless energy-carrying transmitting device, that is, the sampling clock cycle T _s of the wireless energy-carrying receiving device satisfies

The Gardner bit synchronization algorithm works as follows:

After sampling by the sampling period of the wireless energy-carrying receiving device, the transmitted signal with the symbol rate T becomes a discrete signal, and m is the sequence pointer of the discrete signal. The transmitted signal that becomes a discrete signal is input to the interpolation filter and the value obtained after processing is sent to the timing error detector (Time Error Detection, TED), so as to obtain the phase error between the input transmitted signal and the local sampling clock. Then pass a loop filter to filter out the noise and high-frequency components in the discrete signal, send the filtered signal to the numerically controlled oscillator (Numerically Controlled Oscillator, NCO), and calculate the integer sampling time and interpolation filter Interpolate point positions to obtain the latest timing output yI.

Wherein, the function of NCO is: when t=kT _i , sample the above discrete signal x(mT _s ) obtained after being processed by an interpolation filter, where k is a positive integer, and T _i is a resampling period. The working clock of the NCO is consistent with the sampling period clock of the wireless energy-carrying receiving device, which is also T _s . The resampling period T _i is synchronized with the symbol rate T of the transmitted signal, and the satisfied ratio T/T _i is an integer. When the NCO register overflows once, it means that a resampling operation is to be performed, and this is the moment when the interpolation filter performs an operation to obtain the latest timing output yI.

The calculation method of the above integer sampling time m _k is:

Among them, k is a positive integer, T _i is the resampling period, T _s is the sampling clock period of the wireless energy-carrying receiving device, int[] represents the rounding function, that is, the input data of the function is taken as an integer value.

The calculation method of the above-mentioned interpolation filter interpolation point position μ _k is:

Among them, k is a positive integer, T _i is the resampling period, T _s is the sampling clock period of the wireless energy-carrying receiving device, and m _k is the integer sampling time.

The calculation method of the timing output yI of the above-mentioned interpolation filter is:

FI1=0.5×x(n)-0.5×x(n-1)-0.5×x(n-2)+0.5×x(n-3) FI2=1.5×x(n-1)-0.5×x( n)-0.5×x(n-2)-0.5×x(n-3)

FI3=x(n-2)

yI=(FI1×μ _k +FI2)×μ _k +FI3

Among them, FI1, FI2, and FI3 are the interpolation coefficients of the interpolation filter, x(n) represents the zero-mean signal calculated at the sampling moment of the current wireless energy-carrying receiving device, and x(n-1) represents a wireless energy-carrying receiving device The zero-mean signal calculated by the sampling period, x(n-2) represents the zero-mean signal calculated at the moment before the two sampling periods of the wireless energy-carrying receiving device, and x(n-3) represents the three-sampling signal of the wireless energy-carrying receiving device The zero-mean signal calculated at the moment before the cycle, yI is the timing output of the interpolation filter, μ _k is the position of the interpolation point of the interpolation filter.

The above demodulation step is characterized in that the above demodulation process is completed within one sampling period. That is, all operations on the current sampling data point are completed within one sampling period, so that real-time demodulation of the second allocation information can be realized. In the information demodulation step provided in this embodiment, the Gardner bit synchronization algorithm is used to perform bit synchronization processing on the signal, which can greatly shorten the time required to complete a bit synchronization, and the bit synchronization effect is good. At the same time, because the time complexity and space complexity required for the calculation in the above information demodulation steps are low, the above steps can be run on the MCU, thereby ensuring that the information demodulation device has good real-time performance and accuracy.

In this embodiment, the beneficial effects brought by the technical solution of the present application will be further described in conjunction with specific embodiments.

The MCU uses the MSP430 series produced by Texas Instruments (TI), and the specific model is MSP430F5659. The selected wireless energy-carrying transmitting device transmits a signal with a symbol rate of 500Hz and a carrier frequency of 2.45GHz. The transmitted baseband signal is modulated by Biased Amplitude Shift Keying (BASK).

Design the circuit according to the system architecture of the wireless energy-carrying receiving device shown in FIG. 1 , and set the sampling frequency of the wireless energy-carrying receiving device to 2000 Hz. The circuit design of the power distribution module 100 in the wireless energy-carrying receiving device is shown in Figure ₂ , and the resistance value of the six resistors R _B is selected to be 1kΩ; the resistance value _of the resistor R1 is 1kΩ, and the resistance value of the resistor R2 is 5kΩ. The resistance value of R ₃ is 10 kΩ, the resistance value of resistor R ₄ is 1 kΩ, the resistance value of resistor R ₅ is 2 kΩ, and the resistance value of resistor R ₆ is 3 kΩ. The I/O1 port is connected to the pin P2.1 of the chip MSP430F5659, and the I/O2 port is connected to the pin P2.2 of the chip MSP430F5659

Connection, the I/O3 port is connected with the pin P2.3 of the chip MSP430F5659, the I/O4 port is connected with the pin P2.4 of the chip MSP430F5659, the I/O5 port is connected with the pin P2.5 of the chip MSP430F5659, The I/O6 port is connected with the pin P2.6 of the chip MSP430F5659.

Control pin P2.2 and pin P2.5 of MSP430F5659 to output high level, pin P2.1, pin P2.3, pin P2.4 and pin P2.6 output low level, that is, at this time In the power distribution module 100 , R ₂ is selected as the voltage dividing resistor of the first link unit 110 , and R ₄ is selected as the voltage dividing resistor of the second link unit 120 . Further, at this moment, the amplitude ratio of the output signals of the first output terminal V _Out1 and the second output terminal V _Out2 is

The power distribution of the received signal containing information and energy is realized. Wherein, the first distribution signal output by the first output terminal V _Out1 is an energy link signal, and the second distribution signal output by the second output terminal V _Out2 is an information link signal.

MSP430F5659 controls the switch unit to open, so that the energy link signal flows into the energy harvester through the switch unit. MSP430F5659 performs information demodulation after sampling the information link signal according to the information demodulation process shown in Figure 5. The MSP430F5659 can successfully demodulate the information carried by the transmitted signal of the wireless energy-carrying transmitting device, and the power consumption of the MSP430F5659 is kept at a low level. In this embodiment, images of the sampled data before the information demodulation processing and the zero-mean signal obtained after the information demodulation processing are shown in FIG. 6 . FIG. 6 is a schematic waveform diagram of sampling data and a zero-mean signal according to one embodiment of the present application. According to the waveform shown in Figure 6, it can be seen that when using the information demodulation steps provided by this embodiment to process the information demodulation signal, the Gardner bit synchronization algorithm is used for bit synchronization processing, which greatly shortens the time required to complete a bit synchronization , high real-time performance, and good bit synchronization effect.

It should be understood that although the various steps in the flow charts of FIGS. 3-5 are shown sequentially as indicated by the arrows, these steps are not necessarily executed sequentially in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least some of the steps in FIGS. 3-5 may include multiple steps or stages. These steps or stages are not necessarily executed at the same time, but may be executed at different times. The steps or stages The order of execution is not necessarily performed sequentially, but may be performed alternately or alternately with other steps or at least a part of steps or stages in other steps.

In the description of this specification, descriptions referring to the terms "some embodiments", "other embodiments", "ideal embodiments" and the like mean that specific features, structures, materials, or characteristics described in connection with the embodiments or examples are included in this specification. In at least one embodiment or example of the application. In this specification, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the present application, and the description thereof is relatively specific and detailed, but should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of protection of the patent application should be based on the appended claims.

Claims (15)

1. A wireless portable energy receiving device, comprising:

   A power distribution module, configured to receive a baseband signal, perform power distribution on the baseband signal according to a power distribution coefficient, and output a first distribution signal and a second distribution signal, and the baseband signal contains information and energy;

   A control module, connected to the power distribution module, used to adjust the power distribution coefficient of the power distribution module in real time by adjusting the operating parameters of the power distribution module during the use of the wireless energy-carrying receiving device;

   An energy collection module, connected to the power distribution module and the control module respectively, and used to collect energy for the first distribution signal under the control of the control module;

   An information demodulation module is connected to the power distribution module and the control module respectively, and is used for performing information demodulation on the second distribution signal under the control of the control module.
2. The wireless energy-carrying receiving device according to claim 1, wherein the power distribution module includes a first link unit and a second link unit, the first link unit includes a plurality of controllable resistance circuits, the The second link unit also includes a plurality of controllable resistance circuits;

   The input ends of each controllable resistance circuit in the first link unit are connected to the input end of the power distribution module, and the output ends of each controllable resistance circuit in the first link unit are connected to the first chain The output end of the road unit; each controllable resistance circuit in the first link unit is also connected to the control module;

   The input ends of each controllable resistance circuit in the second link unit are connected to the input end of the power distribution module, and the output ends of each controllable resistance circuit in the second link unit are connected to the second chain The output end of the road unit; each controllable resistance circuit in the second link unit is also connected to the control module;

   The input terminal of the power distribution module is used to receive the baseband signal; the output terminal of the first link unit is used to output the first distribution signal, and the output terminal of the second link unit is used to output the second distribution signal. Signal;

   The control module adjusts the power distribution coefficient of the power distribution module by controlling the resistance of the first link unit and the resistance of the second link unit.
3. The wireless energy-carrying receiving device according to claim 1, wherein the control module controls the on-off of each controllable resistance circuit in the first link unit and each controllable resistance circuit in the second link unit The circuit is turned on and off to adjust the power distribution coefficient of the power distribution module.
4. The wireless energy-carrying receiving device according to claim 1, wherein the controllable resistance circuit comprises a first resistance and a switching device,

   One end of the first resistor is connected to the first end of the switch device, and the other end of the first resistor is connected to the input end of the controllable resistance circuit; the second end of the switch device is connected to the The control module is connected, and the third terminal of the switching device is connected with the output terminal of the controllable resistance circuit.
5. The wireless energy-carrying receiving device according to claim 4, wherein the controllable resistance circuit further includes a second resistance, one end of the second resistance is connected to the second end of the switching device, and the first end is connected to the second end of the switching device. The other ends of the two resistors are connected with the control module.
6. The wireless energy-carrying receiving device according to claim 4, wherein the switching device comprises a bipolar junction transistor.
7. The wireless energy-carrying receiving device according to claim 6, wherein the control module outputs a high level or a low level through a port connected to the second end of the switching device to control the conduction or due.
8. The wireless energy-carrying receiving device according to claim 1, wherein the first link unit includes three controllable resistance circuits, and the second link unit also includes three controllable resistance circuits.
9. The wireless energy-carrying receiving device according to claim 1, wherein the energy collection module comprises:

   a switch unit, connected to the power distribution module and the control module respectively, for receiving the first distribution signal under the control of the control module;

   An energy harvester, connected to the switch unit, for collecting energy from the first distribution signal.
10. The wireless energy-carrying receiving device according to claim 9, wherein the switch unit is a switch circuit chip, a switch transistor or a field effect transistor, and the energy collector is a capacitor.
11. The wireless energy-carrying receiving device according to claim 1, wherein the information demodulation module includes:

    a sampling unit, connected to the control module and the power distribution module respectively, for sampling the second distribution signal to obtain sampling data;

    A data processing unit, connected to the sampling unit, for performing information demodulation processing on the sampling data.
12. A method for receiving a wireless energy-carrying signal, applied to the wireless energy-carrying receiving device described in any one of claims 1-11, the method comprising:

    receiving a baseband signal; the baseband signal contains information and energy;

    Adjust the power distribution coefficient;

    performing power allocation on the baseband signal according to the power allocation coefficient, and acquiring a first allocation signal and a second allocation signal;

    performing energy collection on the first allocated signal to obtain the energy of the baseband signal;

    performing information demodulation on the second distribution signal to obtain data information of the baseband signal.
13. The wireless energy-carrying signal receiving method according to claim 12, wherein said performing information demodulation on said second distribution signal, and acquiring information of said baseband signal comprises:

    acquiring said second allocation signal;

    performing matched filter processing, sliding smoothing processing, and bit synchronization processing on the second distribution signal at the current moment in order to obtain a bit synchronization signal at the current moment;

    Comparing the amplitude of the bit synchronization signal at the current moment with a preset value to obtain a judgment result at the current moment;

    Composing the judgment result at the current moment and the judgment result at the previous moment into judgment data, and performing frame header detection on the judgment data;

    If the frame header is detected, decoding the second allocation signal at a later time to obtain the data information sent by the wireless energy-carrying transmitting device;

    Otherwise, acquire the next second allocation signal.
14. The method for receiving a wireless energy-carrying signal according to claim 13, wherein a Gardner algorithm is used for bit synchronization processing.
15. The wireless energy-carrying signal receiving method according to claim 14, wherein, using the Gardner algorithm to perform bit synchronization processing includes:

    inputting said second assigned signal into an interpolation filter;

    inputting the second distribution signal processed by the interpolation filter into a loop filter to filter out noise and high-frequency components in the second distribution signal;

    Send the filtered second distribution signal into a digitally controlled oscillator, sample the result obtained after the second distribution signal is processed by an interpolation filter, and calculate the integer sampling time and the interpolation filter interpolation value point position, thereby obtaining the latest timing output, the latest timing output is the bit synchronization signal;

    The calculation method of the integer sampling time is:

    

    In the formula, mk is an integer sampling time, k is a positive integer, Ti is a resampling period, the ratio of the resampling period Ti to the symbol rate T of the second distribution signal is an integer, and Ts is a wireless energy-carrying receiving device The sampling clock cycle of the wireless energy-carrying receiving device is four times the symbol rate T sent by the wireless energy-carrying transmitting device. largest integer part;

    The calculation method of the interpolation point position of the interpolation filter is:

    

    In the formula, μ _k is the interpolation point position of the interpolation filter, k is a positive integer, T _i is the resampling cycle, T _s is the sampling clock cycle of the wireless energy-carrying receiving device, and m _k is the integer sampling time;

    The calculation method of the timing output is:

    FI1＝0.5×x(n)-0.5×x(n-1)-0.5×x(n-2)+0.5×x(n-3)

    FI2=1.5×x(n-1)-0.5×x(n)-0.5×x(n-2)-0.5×x(n-3)

    FI3=x(n-2)

    yI=(FI1×μ _k +FI2)×μ _k +FI3

    In the formula, FI1, FI2, and FI3 are the interpolation coefficients of the interpolation filter, x(n) represents the zero-mean signal calculated at the sampling time of the current wireless energy-carrying receiving device, and x(n-1) represents the value of the wireless energy-carrying receiving device The zero-mean signal calculated before one sampling period, x(n-2) represents the zero-mean signal calculated before two sampling periods of the wireless energy-carrying receiving device, and x(n-3) represents three wireless energy-carrying receiving devices The zero-mean signal calculated at the moment before the sampling period, yI is the timing output of the interpolation filter, μ _k is the position of the interpolation point of the interpolation filter.

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