WO2024077623A1 - Appareil de transmission d'énergie sans fil, procédé de traitement de signal, dispositif et système - Google Patents

Appareil de transmission d'énergie sans fil, procédé de traitement de signal, dispositif et système Download PDF

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WO2024077623A1
WO2024077623A1 PCT/CN2022/125504 CN2022125504W WO2024077623A1 WO 2024077623 A1 WO2024077623 A1 WO 2024077623A1 CN 2022125504 W CN2022125504 W CN 2022125504W WO 2024077623 A1 WO2024077623 A1 WO 2024077623A1
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channel
signal
reference signal
amplitude
channels
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PCT/CN2022/125504
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English (en)
Chinese (zh)
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赵明
胡林
马鑫
赵德双
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华为技术有限公司
电子科技大学
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Priority to PCT/CN2022/125504 priority Critical patent/WO2024077623A1/fr
Publication of WO2024077623A1 publication Critical patent/WO2024077623A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture

Definitions

  • the present application relates to the field of wireless energy transmission technology, and in particular to a wireless energy transmission device, a signal processing method, a device and a system.
  • microwave wireless energy transmission (MPT) technology as an emerging wireless power transfer (WPT) technology
  • WPT wireless power transfer
  • the transmitter or charging station
  • the receiver or receiving terminal
  • the transmitter needs to obtain the location information or transceiver channel information of the receiver first.
  • Traditional beam-steering microwave wireless energy transmission technology originated from point-to-point long-distance scenarios.
  • the transmitter obtains the location/channel information of the receiver through beam scanning and other technologies, and then aligns the energy beam to the receiver for wireless energy transmission.
  • the multipath problem caused by the complex electromagnetic scattering environment makes it difficult for traditional beam-steering microwave wireless energy transmission technology to accurately locate and efficiently transmit energy to the receiver.
  • time reversal microwave wireless energy transmission technology can achieve accurate positioning, automatic tracking, adaptive focusing and high-efficiency energy transmission of the receiving end in a complex multipath environment.
  • the work of the time reversal wireless energy transmission system includes three stages, namely the detection stage, the time reversal processing stage and the return focus wireless energy transmission stage.
  • the detection stage refers to: the transmitter detects the guidance signal sent by the receiving end and extracts the amplitude and phase to obtain the guidance signal waveform containing the transceiver channel information.
  • the time reversal processing stage refers to: the transmitter performs time reversal processing on the guidance signal waveform to obtain a time reversal waveform.
  • the return focus wireless energy transmission stage refers to: the transmitter transmits a time reversal waveform, which is focused at the receiving end, so that the receiving end receives the radio frequency signal carrying energy to achieve wireless energy transmission.
  • the present application provides a wireless energy transmission device, a signal processing method, an apparatus and a system for improving the accuracy and sensitivity of acquiring the amplitude and phase information of a guidance signal.
  • a wireless energy transmission device which includes a plurality of cascaded channels, the plurality of channels including a first channel and a plurality of second channels;
  • the first channel is used to receive a first guide signal (i.e., the guide signal received by the first channel), and output a reference signal according to the first guide signal, for example, the reference signal may be obtained by gain controlling the first guide signal, and the frequency of the reference signal is the same as the frequency of the first guide signal;
  • each second channel of the plurality of second channels is used to receive a second guide signal (i.e., the guide signal received by the second channel), and determine the phase and amplitude of the second guide signal according to the reference signal, and the phase and amplitude of the second guide signal are used to determine the energy transmission signal of the second channel; wherein the first guide signal and the second guide signal are obtained by the first channel and the second channel receiving the same guide signal, so that the frequency of the first guide signal, the frequency of the reference signal and the frequency of the second guide signal are all the same
  • the first channel is used to output a reference signal according to the received first guide signal
  • each of the multiple second channels is used to determine the amplitude and phase of the received second guide signal according to the reference signal, that is, the multiple second channels all use the first guide signal of the first channel as the reference signal to identify the amplitude and phase of the second guide signal of each second channel. Since the frequency of the reference signal is the same as the frequency of the second guide signal, the amplitude and phase information of the second guide signal determined based on the reference signal has a small error, high accuracy, and good anti-interference performance.
  • the first channel stabilizes the amplitude of the first guide signal to obtain the reference signal used by the multiple second channels for phase and amplitude identification, thereby reducing the hardware complexity and implementation difficulty of the wireless energy transmission device and improving the receiving sensitivity.
  • the first channel includes: a first gain control unit, which is used to perform gain control on the first pilot signal (for example, automatic gain control) to obtain the reference signal with stable amplitude, and the amplitude stability may mean that the fluctuation value of the amplitude of the reference signal is less than a certain preset threshold value, and the preset threshold value may be set in advance, for example, the preset threshold value may be 2dBm, 2.5dBm or 3dBm, etc.
  • the multiple second channels do not include a gain control unit.
  • the first pilot signal is gain controlled by the first gain control unit in the first channel to obtain a reference signal with stable amplitude, so that the multiple second channels can share the reference signal to perform amplitude phase identification on the second pilot signals received by each of them.
  • the second channel includes: a splitter, which can be a power splitter; the splitter is used to split the reference signal output by the previous channel of the second channel cascade into a first reference signal and a second reference signal, and output the second reference signal to the next channel of the second channel cascade, and the first reference signal is used to determine the phase and amplitude of the second pilot signal.
  • each second channel of the multiple second channels can receive the reference signal output by the previous channel of the cascade, and use a part of the reference signal for the second pilot signal to identify the amplitude and phase, and transmit the other part to the next channel of the cascade, so as to achieve the purpose of the multiple second channels sharing the reference signal.
  • the second channel further includes: a mixer, which may be an IQ mixer; the mixer is used to perform mixing processing on the first reference signal and the second pilot signal to obtain two DC signals, and the two DC signals are used to determine the phase and amplitude of the second pilot signal.
  • a mixer which may be an IQ mixer
  • the mixer is used to perform mixing processing on the first reference signal and the second pilot signal to obtain two DC signals, and the two DC signals are used to determine the phase and amplitude of the second pilot signal.
  • each second channel of the multiple second channels can perform mixing processing on the first reference signal and the second pilot signal through the mixer to achieve amplitude phase identification of the second pilot signal.
  • the second channel further includes: an amplifier, which is used to amplify the reference signal output by the previous channel of the second channel cascade, and transmit the amplified reference signal to the splitter.
  • each second channel can perform power amplification on the reference signal received by each channel through the amplifier so that the reference signal has a larger power, so that when the reference signal is used to identify the amplitude and phase of the second pilot signal, the power consumption during the mixing process can be reduced, thereby further improving the accuracy and sensitivity of obtaining the amplitude and phase information of the pilot signal.
  • the second channel further includes: a second gain control unit, which is used to perform gain control on the reference signal output by the previous channel of the second channel cascade, and transmit the obtained reference signal with a stable amplitude to the splitter.
  • each second channel can perform power amplification on the reference signal received by each channel through the second gain control unit, so that the power of the reference signal is maintained at a certain constant power value, so that when the reference signal is used to identify the amplitude and phase of the second pilot signal, the power consumption during the mixing process can be reduced, thereby further improving the accuracy and sensitivity of obtaining the amplitude and phase information of the pilot signal.
  • the second channel further includes: a processing unit, configured to determine the phase and amplitude of the second pilot signal according to the two DC signals.
  • the processing unit in each second channel can determine the phase and amplitude of the second pilot signal according to the two DC signals, thereby obtaining amplitude and phase information with high accuracy and sensitivity.
  • the device further includes an antenna array; wherein the antenna array includes multiple antenna units, and each channel in the multiple channels is coupled to at least one antenna unit in the multiple antenna units.
  • the antenna array includes multiple antenna units, and each channel in the multiple channels is coupled to at least one antenna unit in the multiple antenna units.
  • the device further includes: a plurality of switching switches, each of the plurality of switching switches correspondingly coupling between one of the plurality of channels and the at least one antenna unit correspondingly coupled to the channel.
  • the plurality of channels are coupled to the antenna units in the antenna array through the plurality of switching switches, and the plurality of switching switches can be used to implement switching of reception and transmission of different channels.
  • a signal processing method which is applied to a wireless energy transmission device, the device includes a plurality of cascaded channels, the plurality of channels include a first channel and a plurality of second channels, the method including: the first channel receives a first guide signal (i.e., the guide signal received by the first channel), and outputs a reference signal according to the first guide signal, for example, the reference signal may be obtained by gain controlling the first guide signal, and the frequency of the reference signal is the same as the frequency of the first guide signal; each second channel of the plurality of second channels receives a second guide signal and the reference signal, and determines a phase and an amplitude of the second guide signal according to the reference signal, the phase and the amplitude of the second guide signal are used to determine the energy transmission signal of the corresponding second channel; wherein the first guide signal and the second guide signal are obtained by the first channel and the second channel receiving the same guide signal, so that the frequency of the first guide signal, the frequency of the reference signal and the frequency of the
  • the first channel includes a first gain control unit, and the first channel outputs a reference signal according to the first pilot signal, including: the first gain control unit performs gain control on the first pilot signal to obtain the reference signal with a stable amplitude.
  • the plurality of second channels do not include a gain control unit.
  • the second channel includes a splitter, and the second channel determines the phase and amplitude of the second guide signal based on the reference signal, including: the splitter splits the reference signal output by the previous channel of the second channel cascade into a first reference signal and a second reference signal, and outputs the second reference signal to the next channel of the second channel cascade, and the first reference signal is used to determine the phase and amplitude of the second guide signal.
  • the second channel further includes a mixer, and the second channel determines the phase and amplitude of the second pilot signal according to the reference signal, and further includes: the mixer performs mixing processing on the first reference signal and the second pilot signal to obtain two DC signals, and the two DC signals are used to determine the phase and amplitude of the second pilot signal.
  • the mixer can be an IQ mixer, so that the mixing processing can be an orthogonal mixing processing.
  • the second channel further includes an amplifier
  • the method further includes: the amplifier amplifies a reference signal output by an upper channel of the second channel cascade, and transmits the amplified reference signal to the splitter.
  • the second channel also includes a second gain control unit
  • the method also includes: the second gain control unit performs gain control on the reference signal output by the previous channel of the second channel cascade, and transmits the obtained reference signal with stable amplitude to the splitter.
  • the second channel further includes a processing unit, and the method further includes: the processing unit determines the phase and amplitude of the second guide signal according to the two DC signals.
  • a chip module including: a chip and a packaging substrate, the chip is fixed to the packaging substrate, and the chip includes a wireless energy transmission device provided by the first aspect or any possible implementation of the first aspect.
  • a wireless energy transmission device which includes a control unit and a wireless energy transmission device as provided in the first aspect or any possible implementation of the first aspect; wherein the control unit is used to control the wireless output device.
  • a wireless energy transmission system which includes: a wireless energy transmission device and an energy receiving device, the energy receiving device is used to send a guidance signal to the wireless energy transmission device; wherein the wireless energy transmission device includes a wireless energy transmission device provided by the first aspect or any possible implementation method of the first aspect.
  • FIG1 is a schematic diagram of the structure of a wireless energy transmission system provided in an embodiment of the present application.
  • FIG2 is a schematic diagram of a wireless energy transmission device using a unified local oscillator signal as a reference signal
  • FIG3 is a schematic diagram of a wireless energy transmission device using a pilot signal of an adjacent channel as a reference signal
  • FIG4 is a schematic diagram of the structure of a wireless energy transmission device provided in an embodiment of the present application.
  • FIG5 is a schematic structural diagram of another wireless energy transmission device provided in an embodiment of the present application.
  • FIG6 is a schematic structural diagram of another wireless energy transmission device provided in an embodiment of the present application.
  • FIG7 is a schematic diagram of the structure of an IQ mixer provided in an embodiment of the present application.
  • FIG8 is a schematic diagram of the relationship between the power of a reference signal and the frequency conversion loss provided in an embodiment of the present application.
  • FIG9 is a flow chart of a signal processing method provided in an embodiment of the present application.
  • At least one of a, b or c can represent: a, b, c, a and b, a and c, b and c, a, b and c; where a, b and c can be single or multiple.
  • the microwave wireless energy transmission technology can be a time reversal wireless power transfer (TR-WPT) technology.
  • TR-WPT time reversal wireless power transfer
  • Time reversal refers to the transformation in which the spatial coordinates remain unchanged and the time coordinates change their signs; in the frequency domain, time reversal is equivalent to phase conjugation; in the time domain, time reversal refers to the reverse operation of the time dimension on the time domain signal, that is, reversing the signal on the time axis so that the signal sampled at the earliest moment becomes the signal at the last moment, and the signal at the last moment becomes the signal at the earliest moment.
  • Time reversal wireless energy transmission technology can utilize the space-time focusing characteristics of time reversal to focus the radiated microwave energy and transmit it to a specified location.
  • FIG1 is a schematic diagram of the structure of a wireless energy transmission system provided in an embodiment of the present application, and the implementation of the wireless energy transmission system includes: at least one energy receiving device 101, and a wireless energy transmitting device 102 for transmitting energy to the at least one energy receiving device 101.
  • the wireless energy transmitting device 102 transmits wireless energy to the at least one energy receiving device 101, which can also be called that the wireless energy transmitting device 102 supplies power to the at least one energy receiving device 101 in a wireless manner or charges the at least one energy receiving device 101 in a wireless manner.
  • FIG1 is taken as an example that the at least one energy receiving device 101 includes multiple energy receiving devices.
  • the at least one energy receiving device 101 may include one or more energy receiving devices.
  • the at least one energy receiving device 101 may first send a guidance signal (the guidance signal may also be referred to as an energy transmission request signal or a detection signal) to the wireless energy transmitting device 102, and then receive the wireless energy sent from the wireless energy transmitting device 102.
  • a guidance signal the guidance signal may also be referred to as an energy transmission request signal or a detection signal
  • the at least one energy receiving device 101 may include but is not limited to: mobile phones, tablet computers, laptop computers, PDAs, smart door locks, wearable devices (such as smart watches, smart bracelets, pedometers, etc.), vehicle-mounted devices, virtual reality (VR) devices, augmented reality (AR) devices, smart home devices (such as refrigerators, televisions, air conditioners, electric meters, etc.), smart robots, workshop equipment, terminals in self-driving, terminals in remote medical surgery, terminals in smart grids, terminals in transportation safety, terminals in smart cities, or terminals in smart homes, flying equipment (such as smart robots, hot air balloons, drones, airplanes), etc.
  • VR virtual reality
  • AR augmented reality
  • smart home devices such as refrigerators, televisions, air conditioners, electric meters, etc.
  • smart robots workshop equipment
  • terminals in self-driving terminals in remote medical surgery
  • terminals in smart grids terminals in transportation safety
  • terminals in smart cities or terminals in smart homes
  • flying equipment such
  • the wireless energy transmitting device 102 can be called a wireless charging transmitter, a wireless charging station, or a wireless energy transmission device, which is used to realize short-range, medium-range, long-range and large-range wireless power supply (for example, the distance can be several millimeters or tens of meters, etc., and the angle coverage range of wireless charging can be more than 120°), and can be used to realize continuous tracking wireless power supply during the movement of the at least one energy receiving device 101, and can also be used to wirelessly power multiple energy receiving devices 101 at the same time.
  • a wireless charging transmitter for example, the distance can be several millimeters or tens of meters, etc., and the angle coverage range of wireless charging can be more than 120°
  • the wireless energy transmitting device 102 can be a phased array device, and the wireless energy transmitting device 102 can include an antenna array and multiple channels coupled to the antenna array, and the multiple channels can also be called multiple radio frequency channels.
  • Each channel in the multiple channels can include a transmitting channel and a receiving channel.
  • the multiple channels can be used to receive the guidance signal sent from the at least one energy receiving device 101 through the antenna array, and send the energy transmission signal to the at least one energy receiving device 101.
  • the antenna array may include multiple antenna units, and each of the multiple channels may be coupled to an antenna unit in the antenna array; or, the antenna array may include multiple antenna sub-arrays, and each of the multiple channels may be coupled to an antenna sub-array, and each antenna sub-array may include at least two antenna units.
  • the process of the wireless energy transmitting device 102 using time-reversed wireless energy transmission to power the energy receiving device 101 may include: the energy receiving device 101 sends a guidance signal, each of the multiple channels of the wireless energy transmitting device 102 receives the guidance signal and extracts amplitude and phase information, and the amplitudes and phases of the guidance signals received by the multiple channels may be different; the multiple channels perform time-reversal processing on the energy transmission signal according to the amplitude and phase information of the guidance signals received by each channel, and then transmit the energy transmission signal that has undergone time-reversal processing to the outside, and the transmitted energy transmission signal will automatically form an electromagnetic energy focusing spot at the energy receiving device 101 to power the energy receiving device 101.
  • the wireless energy transmitting device 102 can also power multiple energy receiving devices 101 at the same time.
  • the guidance signal received by each channel in the wireless energy transmitting device 102 can be a signal corresponding to the guidance signals sent by the multiple energy receiving devices at each channel.
  • each channel can send an energy transmission signal based on the linearly superimposed signal.
  • the amplitude and phase information of the guidance signal obtained by each channel of the wireless energy transmitting device 102 is the key to whether the wireless energy transmission signal transmitted by the wireless energy transmitting device 102 can be accurately focused on the energy receiving device 101.
  • the accuracy and sensitivity of obtaining the amplitude and phase information of the guidance signal will greatly affect the energy focusing effect, and further affect the energy transmission efficiency of the wireless energy transmission system.
  • the first solution uses a unified local oscillator signal to mix with the pilot signals received by multiple channels in the wireless energy transmission device, thereby determining the amplitude and phase information of the pilot signals of each channel.
  • the wireless energy transmission device may include a voltage-controlled oscillator (VCO), which is used to generate a local oscillator signal and transmit the local oscillator signal to each of the multiple channels of the wireless energy transmission device, and each channel mixes the local oscillator signal with the pilot signal received by the channel to determine the amplitude and phase information of the pilot signal.
  • VCO voltage-controlled oscillator
  • the two signals obtained are intermediate frequency signals with non-zero frequencies. It is necessary to use a dedicated processor to process the intermediate frequency signal to obtain the amplitude and phase of the pilot signal, which increases the cost.
  • this scheme has low accuracy and large error in amplitude and phase identification; in addition, when the wireless energy transmission device uses a large-scale antenna array, there is also the problem of difficulty in designing the power distribution network of the local oscillator signal.
  • the second solution uses the pilot signal received by the previous channel as the reference signal, and performs mixing processing with the pilot signal received by the next channel, thereby determining the amplitude and phase information of the pilot signal of the next channel.
  • the pilot signal A2 is split into two signals A2_1 and A2_2, and the signal A1 is mixed with the signal A2_1 to determine the phase difference between the pilot signal received by the second channel and the pilot signal received by the first channel.
  • the pilot signal A3 is split into two signals A3_1 and A3_2, and the signal A2_2 and the signal A3_1 are mixed to determine the phase difference between the pilot signal received by the third channel and the second channel. Therefore, the phase difference between the pilot signal received by the third channel and the first channel is That is, the phase information of the subsequent channel relative to the pilot signal received by the first channel is obtained.
  • each channel In this scheme, the amplitude and phase information of each channel relative to the first channel is calculated based on the amplitude and phase information of the previous channel. Therefore, the amplitude and phase of the pilot signal received by the multiple channels determined according to this scheme will have accumulated errors, and the more the number of the multiple channels, the greater the accumulated errors.
  • each channel in order to achieve stable amplitude and phase discrimination, each channel also needs to perform automatic gain control on the pilot signal from the previous channel to ensure the stability of the amplitude of the pilot signal. Due to the addition of the automatic gain control circuit, this scheme will also have the problem of relatively large size and difficulty in integration with a single small-sized array element module at high frequency bands.
  • the embodiment of the present application provides a novel wireless energy transmission device, in which multiple channels in the wireless energy transmission device use the guidance signal of the same channel as the reference signal, thereby performing amplitude and phase discrimination on the guidance signals received by the multiple channels. Since the frequency of the reference signal is exactly the same as the frequency of the guidance signals received by the multiple channels, the amplitude and phase errors of the guidance signals of the multiple channels determined based on the reference signal are small, the accuracy is high, and the device has good anti-interference performance.
  • FIG4 is a schematic diagram of the structure of a wireless energy transmission device provided in an embodiment of the present application, which may be a wireless energy transmission device in the wireless energy transmission system provided above, or a chip module applied to the wireless energy transmission device.
  • the device includes: a plurality of cascaded channels, the plurality of channels including: a first channel CH1 and a plurality of mutually cascaded second channels represented as CH21 to CH2n, where n is an integer greater than 1.
  • the first channel CH1 is used to: receive a first pilot signal, and output a reference signal according to the first pilot signal, the frequency of the reference signal being the same as the frequency of the first pilot signal.
  • Each second channel CH2i (i has a value range of 1 to n) among the multiple second channels CH21 to CH2n is used to: receive a second pilot signal, and determine the phase and amplitude of the second pilot signal according to the reference signal, the phase and amplitude of the second pilot signal being used to determine the corresponding second channel energy input signal.
  • each second channel CH2i is used to: determine two DC signals according to the reference signal and the received second pilot signal, for example, mixing the reference signal and the second pilot signal to obtain two DC signals, the two DC signals being used to determine the phase and amplitude of the second pilot signal.
  • the first pilot signal and the second pilot signal are obtained by receiving the same pilot signal respectively through the first channel CH1 and the second channel CH2i, so that the frequency of the first pilot signal is the same as the frequency of the second pilot signal.
  • the frequency of the reference signal is the same as the frequency of the first pilot signal, so that the frequency of the first pilot signal, the frequency of the reference signal and the frequency of the second pilot signal are all the same.
  • the energy receiving device in the wireless energy transmission system can send a guidance signal to the wireless energy transmission device, and the guidance signal can also be called an energy transmission request signal or a detection signal.
  • the first channel CH1 and multiple second channels CH21 to CH2n in the wireless energy transmission device can receive the guidance signal sent by the energy receiving device.
  • the first guidance signal can refer to the guidance signal received by the first channel CH1
  • the second guidance signal can refer to the guidance signal received by the second channel CH2i.
  • the multiple second channels CH21 to CH2n can each receive a corresponding second guidance signal.
  • each second channel CH2i can obtain two DC signals after mixing the reference signal and the corresponding received second pilot signal.
  • each second channel CH2i can also detect and filter the mixed signal to obtain the two DC signals after detection and filtering, and the amplitude and phase information of the second pilot signal can be extracted respectively through the two DC signals.
  • the two DC signals output by the multiple second channels CH21 to CH2n are respectively represented as IQ21 to IQ2n.
  • the first channel CH1 may include a first gain control unit AGC1.
  • the first gain control unit AGC1 is used to: when receiving the first pilot signal, perform gain control (for example, automatic gain control) on the first pilot signal to obtain a reference signal with a stable amplitude.
  • the reference signal with a stable amplitude may refer to a reference signal whose amplitude fluctuation value is less than a certain preset threshold value, which may be set in advance, for example, the preset threshold value may be 2dBm, 2.5dBm or 3dBm, etc.
  • each second channel CH2i of the plurality of second channels CH21 to CH2n may include: a splitter SP2i.
  • the splitter SP2i may be a power splitter.
  • each second channel CH2i may also include: a mixer; the mixer may be an IQ mixer MIX2i.
  • the IQ mixer may also be referred to as an in-phase quadrature (IQ) mixer.
  • the IQ mixer MIX2i is taken as an example for explanation below.
  • the splitter SP2i in the second channel CH2i is used to split the reference signal output by the previous channel of the second channel CH2i cascade into a first reference signal and a second reference signal, and output the second reference signal to the next channel of the second channel CH2i cascade, and the first reference signal is used to determine the amplitude and phase of the second pilot signal.
  • the first reference signal is transmitted to the IQ mixer MIX2i for mixing with the second pilot signal.
  • the first two channels (i.e., the second channel CH21 and the second channel CH22) of the plurality of second channels CH21 to CH2n are taken as an example.
  • the previous channel of the second channel CH21 cascade is the first channel CH1
  • the splitter SP21 in the second channel CH21 is used to receive the reference signal Lo 0 output by the first channel CH1, split the reference signal Lo 0 into a first reference signal Lo 11 and a second reference signal Lo 12 , and transmit the first reference signal Lo 11 to the IQ mixer MIX21, and output the second reference signal Lo 12 to the second channel CH22.
  • the splitter SP22 in the second channel CH22 is used to receive the reference signal Lo 12 output by the second channel CH21, split the reference signal Lo 12 into a first reference signal Lo 21 and a second reference signal Lo 22 , and transmit the first reference signal Lo 21 to the IQ mixer MIX22, and output the second reference signal Lo 22 to the second channel CH23.
  • the splitter SP2n may not be provided in the second channel CH2n; or, the splitter SP2n provided in the second channel CH2n does not work.
  • the IQ mixer MIX2i in the second channel CH2i is used to perform orthogonal mixing processing on the first reference signal and the received second pilot signal to obtain two DC signals.
  • the second channel CH2i can also perform detection and filtering processing after mixing to obtain the two DC signals.
  • the first two channels (i.e., the second channel CH21 and the second channel CH22) of the multiple second channels CH21 to CH2n are taken as an example.
  • the IQ mixer MIX21 in the second channel CH21 is used to: perform orthogonal mixing processing on the first reference signal Lo 11 and the received second pilot signal RF 21 to obtain two DC signals IQ21.
  • the IQ mixer MIX22 in the second channel CH22 is used to: perform orthogonal mixing processing on the first reference signal Lo 21 and the received second pilot signal RF 22 to obtain two DC signals IQ22.
  • the IQ mixer MIX2n in the second channel CH2n is used to: perform orthogonal mixing processing on the reference signal Lo 2(n-1) output by the second channel CH2(n-1 ) and the received second pilot signal RF 2n to obtain two DC signals IQ2n.
  • each second channel CH2i in the plurality of second channels CH21 to CH2n may further include a processing unit PU2i.
  • the processing unit PU2i may be used to determine the amplitude and phase of the second pilot signal according to the two DC signals.
  • the processing unit may include an analog-to-digital converter and a microprocessor, the analog-to-digital converter may be used to convert the two DC signals into digital signals, and the microprocessor may be used to calculate the amplitude and phase of the second pilot signal according to the digital signals corresponding to the two DC signals.
  • the reference signal of the IQ mixer MIX2i input to the second channel 2i is Lo and the second pilot signal is RF, and the process of the orthogonal mixing processing of the IQ mixer MIX2i and the process of determining the amplitude and phase of the second pilot signal RF are introduced and explained.
  • the reference signal Lo and the second pilot signal RF satisfy the following formula (1), where A and B represent the amplitudes of the reference signal Lo and the second pilot signal RF, respectively, and w represents the frequency of the reference signal Lo and the second pilot signal RF. represents the phase of the reference signal Lo, Indicates the phase of the second pilot signal RF.
  • the IQ mixer MIX2i includes a first mixer, a second mixer and a directional coupler, and the directional coupler can be a 90° directional coupler.
  • the input end of the directional coupler is used to receive the reference signal Lo; the two output ends of the directional coupler are respectively coupled with an input end of the first mixer and an input end of the second mixer; the other input end of the first mixer and the other input end of the second mixer are both used to receive the second pilot signal RF.
  • the directional coupler is used to split the reference signal Lo into two sub-reference signals Lo1 and Lo2 with a phase difference of 90° and satisfying formula (2). That is, the two sub-reference signals Lo1 and Lo2 output by the directional coupler are two mutually orthogonal signals, and the two mutually orthogonal signals can also be called in-phase quadrature (IQ) signals.
  • IQ in-phase quadrature
  • the first mixer is used to mix the sub-reference signal Lo1 and the second pilot signal RF, and then obtain the first DC signal DC I after detection and filtering;
  • the second mixer is used to mix the sub-reference signal Lo2 and the second pilot signal RF, and then obtain the second DC signal DC Q after detection and filtering.
  • the first DC signal DC I and the second DC signal DC Q satisfy formula (3).
  • the first DC signal DC I and the second DC signal DC Q are determined only by the amplitude and phase difference between the reference signal Lo and the second pilot signal RF.
  • the tangent value of the phase difference can be determined by formula (4), and then the phase difference between the reference signal Lo and the second pilot signal RF can be determined by the inverse tangent. Satisfies formula (5).
  • tan represents the tangent function
  • arctan represents the inverse tangent function.
  • the phase difference is determined by formula (5)
  • the amplitude of the second pilot signal RF can be determined by formula (6).
  • FIG8 shows the relationship between the conversion loss of an IQ mixer and the power of a reference signal Lo.
  • the amplitude of the reference signal Lo is large (for example, taking the IQ mixer chip HMC525 as an example, the recommended power of the reference signal Lo is 15dBm)
  • the conversion power loss of the second pilot signal RF to a DC signal is small (for example, the loss is 10dB);
  • the amplitude of the reference signal Lo decreases, the conversion loss increases significantly (for example, when the amplitude of the reference signal Lo is -4dBm, the conversion loss is about 22dB), resulting in the DC signal power obtained after the second pilot signal RF is mixed with the low-power reference signal Lo is too small.
  • the power of the DC signal is less than the minimum detection power, the amplitude and phase of the second pilot signal RF cannot be obtained.
  • the first gain control unit AGC1 performs gain control on the first pilot signal received by the first channel CH1 to obtain a reference signal with a stable amplitude, and transmits the reference signal with a stable amplitude to the second channel CH21, so that the second channels CH21 to CH2n can identify the amplitude and phase of the second pilot signals received by each of them based on the reference signal with a stable amplitude.
  • the embodiment of the present application can also power amplify the reference signal Lo received in each second channel CH2i, so that the reference signal Lo has a larger power, for example, the power of the reference signal Lo can be maintained at a certain constant power value, such as 15dBm or other constant power values that can obtain precise phase through an IQ mixer.
  • each second channel CH2i further includes an amplifier AMP2i
  • the input end of the amplifier AMP2i can be used to receive a reference signal
  • the output end of the amplifier is coupled to the input end of the splitter SP2i.
  • the amplifier AMP2i is used to amplify the reference signal output by the previous channel of the second channel CH2i cascade, and transmit the amplified reference signal to the splitter SP2i.
  • the first two channels (i.e., the second channel CH21 and the second channel CH22) of the plurality of second channels CH21 to CH2n are taken as an example.
  • the previous channel of the second channel CH21 cascade is the first channel CH1
  • the amplifier AMP21 in the second channel CH21 is used to receive and amplify the reference signal Lo 0 output by the first channel CH1, and transmit the amplified reference signal Lo 0 to the splitter SP21.
  • the amplifier AMP22 in the second channel CH22 is used to receive and amplify the reference signal Lo 22 output by the second channel CH21, and transmit the amplified reference signal Lo 22 to the splitter SP22.
  • the amplifier AMP2n in the second channel CH2n is used to receive and amplify the reference signal Lo (n-1 )2 output by the second channel CH2(n-1 ), and transmit the amplified reference signal Lo (n-1)2 to the IQ mixer MIX2n.
  • the embodiment of the present application may further perform automatic gain control on the reference signal Lo received in each second channel CH2i so that the reference signal Lo has a larger power.
  • each second channel CH2i of the plurality of second channels CH21 to CH2n further includes a second gain control unit AGC2i
  • the input end of the second gain control unit AGC2i can be used to receive a reference signal
  • the output end of the second gain control unit AGC2i is coupled to the input end of the splitter SP2i.
  • the second gain control unit AGC2i is used to: perform automatic gain control on the reference signal output by the previous channel cascaded from the second channel CH2i, and transmit the obtained reference signal with a stable amplitude to the splitter SP2i.
  • the first two channels (i.e., the second channel CH21 and the second channel CH22) of the plurality of second channels CH21 to CH2n are taken as an example.
  • the previous channel of the second channel CH21 cascade is the first channel CH1
  • the second gain control unit AGC21 in the second channel CH21 is used to receive and stabilize the amplitude of the reference signal Lo 0 output by the first channel CH1, and transmit the reference signal Lo 0 with a stable amplitude to the splitter SP21.
  • the second gain control unit AGC22 in the second channel CH22 is used to receive and stabilize the amplitude of the reference signal Lo 22 output by the second channel CH21, and transmit the reference signal Lo 22 with a stable amplitude to the splitter SP22.
  • the second gain control unit AGC2n in the second channel CH2n is used to receive and stabilize the reference signal Lo (n-1) 2 output by the second channel CH2(n-1) , and transmit the reference signal Lo (n-1)2 with a stable amplitude to the IQ mixer MIX2n.
  • the first channel CH1 may further include a splitter and an IQ mixer. That is, the structures of the first channel CH1 and the second channel CH2i are the same, and in this case, during the operation of the device, the splitter and the IQ mixer in the first channel CH1 may not be enabled. In this way, when the structures of the first channel CH1 and the second channel CH2i are the same, the first channel CH1 and the second channel CH2i may be produced through one manufacturing or the same manufacturing process, thereby reducing the manufacturing cost and complexity.
  • the device also includes an antenna array.
  • the antenna array includes multiple antenna units, and each channel in the multiple channels is coupled to one antenna unit in the multiple antenna units; or, the antenna array includes multiple antenna sub-arrays, and each channel in the multiple channels is coupled to an antenna sub-array, and each antenna sub-array may include at least two antenna units.
  • each channel in the multiple channels is coupled to an antenna unit in the antenna array as an example for description.
  • each of the multiple channels may include a receiving channel and a transmitting channel.
  • the receiving channel can be used to receive the second pilot signal and the corresponding reference signal mentioned above
  • the transmitting channel can be used to send the corresponding energy input signal according to the amplitude and phase of the second pilot signal.
  • the receiving channel and the transmitting channel can share the above-mentioned processing unit.
  • the receiving channel may also include the splitter and IQ mixer mentioned above, as well as an amplifier or a second gain control unit, etc.
  • the transmitting channel may also include a mixer and a power amplifier, etc., and the mixer and the power amplifier are used to set the frequency and amplitude of the corresponding energy input signal.
  • the embodiment of the present application does not impose specific restrictions on the structure in the transmitting channel.
  • the device further includes a plurality of switching switches SW.
  • each switching switch is coupled between one of the plurality of channels and at least one antenna unit coupled to the channel.
  • the switching switch SW coupled to the channel can be used to select the antenna unit and the corresponding receiving channel; when the channel is used to send a signal (e.g., transmit an energy transmission signal), the switching switch SW coupled to the channel can be used to select the antenna unit and the corresponding transmitting channel.
  • the wireless energy transmission device includes a plurality of cascaded channels.
  • the first channel of the plurality of channels can be used to output a reference signal according to the received first guide signal; each of the plurality of second channels can be used to perform frequency mixing processing according to the reference signal and the received second guide signal to obtain two DC signals, which are used to determine the amplitude and phase of the second guide signal, that is, the plurality of second channels all use the first guide signal of the first channel as the reference signal to identify the amplitude and phase of the second guide signal of each second channel.
  • a first gain control unit can be set only in the first channel of the wireless energy transmission device, and the amplitude of the first guide signal of the first channel can be stabilized by the first gain control unit to obtain a reference signal used for phase amplitude identification of the plurality of second channels, thereby reducing the hardware complexity and implementation difficulty of the wireless energy transmission device and improving the receiving sensitivity.
  • a chip module is further provided.
  • the chip module includes a chip and a packaging substrate.
  • the chip is fixed to the packaging substrate. Any one of the wireless energy transmission devices provided above can be integrated on the chip.
  • a wireless energy transmission device which may include a control unit and any one of the wireless energy transmission devices provided above; wherein the control unit may be used to control the wireless energy transmission device.
  • the wireless energy transmission device may include the chip module provided above.
  • An embodiment of the present application also provides a wireless energy transmission system, which includes an energy receiving device and a wireless energy transmission device; wherein the energy receiving device can be used to send a guidance signal to the wireless energy transmission device, and the wireless energy transmission device can include any one of the wireless energy transmission devices provided above.
  • FIG9 is a flow chart of a signal processing method provided in an embodiment of the present application.
  • the signal processing method can be applied to the wireless energy transmission device provided above.
  • the method includes the following steps.
  • the first channel receives a first pilot signal and outputs a reference signal according to the first pilot signal.
  • the first channel includes a first gain control unit, and the first channel outputs a reference signal according to the first pilot signal, including: the first gain control unit performs gain control on the first pilot signal to obtain the reference signal with a stable amplitude.
  • Each second channel among the plurality of second channels receives a second pilot signal and the reference signal, and determines the phase and amplitude of the second pilot signal according to the reference signal, wherein the first pilot signal and the second pilot signal are obtained by the first channel and the second channel receiving the same pilot signal.
  • the phase and amplitude of the second pilot signal are used to determine the energy input signal of the corresponding second channel.
  • the second channel includes a splitter; further, the second channel may also include a mixer.
  • the second channel determines the amplitude and phase of the second guide signal according to the reference signal, including: the splitter splits the reference signal output by the previous channel of the second channel cascade into a first reference signal and a second reference signal, and transmits the first reference signal to the mixer, and outputs the second reference signal to the next channel of the second channel cascade; the mixer performs mixing processing on the first reference signal and the second guide signal to obtain the two DC signals.
  • the second channel can also perform detection and filtering processing on the mixed signal, and obtain two DC signals after detection and filtering. The two DC signals are used to determine the amplitude and phase of the second guide signal.
  • the second channel further includes an amplifier. Accordingly, the method further includes: the amplifier amplifies a reference signal output by a previous channel of the second channel cascade, and transmits the amplified reference signal to the splitter.
  • the second channel further includes a second gain control unit. Accordingly, the method further includes: the second gain control unit performs automatic gain control on the reference signal output by the previous channel cascaded to the second channel, and transmits the obtained reference signal with stable amplitude to the splitter.
  • the second channel further includes a processing unit, and after each second channel outputs two DC signals, the method further includes: the processing unit determines the phase and amplitude of the second guide signal according to the two DC signals.
  • the processing unit may include an analog-to-digital converter and a microprocessor, the analog-to-digital converter converts the two DC signals into digital signals, and the microprocessor determines the amplitude and phase of the second guide signal according to the digital signals corresponding to the two DC signals.
  • the wireless energy transmission device includes a plurality of cascaded channels, the first channel of the plurality of channels can be used to output a reference signal according to the received first guide signal, and each of the plurality of second channels can be used to determine the amplitude and phase of the second guide signal according to the reference signal, that is, the plurality of second channels all use the first guide signal of the first channel as the reference signal, and identify the amplitude and phase of the second guide signal of each second channel. Since the frequency of the reference signal is the same as the frequency of the second guide signal, the amplitude and phase information of the second guide signal determined based on the reference signal has a small error, high precision, and good anti-interference performance.
  • a first gain control unit can be set only in the first channel of the wireless energy transmission device, and the amplitude of the first guide signal of the first channel can be stabilized by the first gain control unit to obtain the reference signal used for phase and amplitude identification of the plurality of second channels, thereby reducing the hardware complexity and implementation difficulty of the wireless energy transmission device and improving the receiving sensitivity.

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Abstract

La présente demande se rapporte au domaine technique de la transmission d'énergie sans fil. La demande concerne un appareil de transmission d'énergie sans fil, un procédé de traitement de signal, un dispositif et un système, qui sont utilisés pour améliorer la précision et la sensibilité d'acquisition d'informations d'amplitude et de phase de signaux pilotes. L'appareil comprend un premier canal et une pluralité de seconds canaux. Le premier canal est utilisé pour recevoir un premier signal pilote et délivrer en sortie un signal de référence en fonction du premier signal pilote ; et chacun de la pluralité de seconds canaux est utilisé pour recevoir un second signal pilote et le signal de référence et déterminer la phase et l'amplitude du second signal pilote en fonction du signal de référence, à savoir, la pluralité de seconds canaux effectuent tous une identification d'amplitude et de phase sur des seconds signaux pilotes des seconds canaux à l'aide du signal de référence délivré par le premier canal selon le premier signal pilote, les phases et les amplitudes des seconds signaux pilotes étant utilisées pour déterminer un signal de transmission de puissance correspondant aux seconds canaux, et le premier signal pilote et les seconds signaux pilotes étant obtenus au moyen du premier canal et des seconds canaux recevant le même signal pilote.
PCT/CN2022/125504 2022-10-14 2022-10-14 Appareil de transmission d'énergie sans fil, procédé de traitement de signal, dispositif et système WO2024077623A1 (fr)

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PCT/CN2022/125504 WO2024077623A1 (fr) 2022-10-14 2022-10-14 Appareil de transmission d'énergie sans fil, procédé de traitement de signal, dispositif et système

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