CN118137688A - Radio frequency energy collection system, control method thereof and electronic equipment - Google Patents
Radio frequency energy collection system, control method thereof and electronic equipment Download PDFInfo
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- CN118137688A CN118137688A CN202410531312.9A CN202410531312A CN118137688A CN 118137688 A CN118137688 A CN 118137688A CN 202410531312 A CN202410531312 A CN 202410531312A CN 118137688 A CN118137688 A CN 118137688A
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- 230000008878 coupling Effects 0.000 claims abstract description 37
- 238000010168 coupling process Methods 0.000 claims abstract description 37
- 238000005859 coupling reaction Methods 0.000 claims abstract description 37
- 230000005540 biological transmission Effects 0.000 claims abstract description 23
- 238000004146 energy storage Methods 0.000 claims description 21
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 14
- 238000003306 harvesting Methods 0.000 claims description 14
- 238000002955 isolation Methods 0.000 claims description 5
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/20—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/001—Energy harvesting or scavenging
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/38—Impedance-matching networks
- H03H7/40—Automatic matching of load impedance to source impedance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/1638—Special circuits to enhance selectivity of receivers not otherwise provided for
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Abstract
The invention discloses a radio frequency energy collecting system, a control method thereof and electronic equipment, wherein the radio frequency energy collecting system comprises a multiband antenna, an impedance matching circuit, a main circuit rectifying circuit, an impedance compensation device and a reverse coupler, wherein the radio frequency signal is firstly received through the multiband antenna and is provided for a load after being processed by the impedance matching circuit and the main circuit rectifying circuit, but if the radio frequency signal received by the multiband antenna is mismatched with the main circuit rectifying circuit, the reverse coupler can couple the radio frequency signal into a coupling signal so that the impedance compensation device performs impedance compensation according to the coupling signal, thereby improving the transmission efficiency of the radio frequency signal. Therefore, the radio frequency energy collection system in the embodiment can automatically compensate the impedance according to the radio frequency signals received by the antenna, so that the radio frequency energy of various frequency bands can be collected, the transmission efficiency of the radio frequency signals is ensured, and the loss of the radio frequency energy is prevented.
Description
Technical Field
The present invention relates to the field of energy harvesting technologies, and in particular, to a radio frequency energy harvesting system, a control method thereof, and an electronic device.
Background
With the rapid development of wireless technology, the collection of radio frequency energy is becoming more and more important. In the related art, it is disclosed that the receiving unit acquires the radio frequency energy of a specific frequency band in the environment, if the radio frequency energy of other frequency bands needs to be collected, other collecting devices need to be used, which is particularly troublesome, but if the current collecting devices are used for forced collection, the transmission efficiency of the radio frequency signal is seriously reduced, and the energy is lost.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, a first object of the present invention is to provide a radio frequency energy collecting system, which can automatically compensate impedance according to radio frequency signals received by an antenna, so as to collect radio frequency energy in various frequency bands, ensure transmission efficiency of the radio frequency signals, and prevent loss of the radio frequency energy.
A second object of the present invention is to provide a control method of a radio frequency energy harvesting system.
A third object of the present invention is to propose an electronic device.
To achieve the above object, an embodiment of a first aspect of the present invention provides a radio frequency energy collecting system, which includes: a multi-band antenna for receiving radio frequency signals of various frequency bands; an input end of the impedance matching circuit is connected with the multiband antenna and is used for matching the impedance between the multiband antenna and a subsequent circuit of the impedance matching circuit; the main path rectifying circuit is used for rectifying the radio frequency signal passing through the impedance matching circuit into a direct current signal and providing the direct current signal to a load; the input end of the reverse coupler is connected with the output end of the impedance matching circuit, the output end of the reverse coupler is connected with the input end of the main rectifying circuit, the isolation end of the reverse coupler is grounded through an adjustable impedance network, and the reverse coupler is configured to couple a reflected signal of a radio frequency signal received by the multiband antenna into a coupled signal when the radio frequency signal is mismatched with the main rectifying circuit; and one end of the impedance compensation device is connected with the input end of the impedance matching circuit, and the other end of the impedance compensation device is connected with the coupling end of the reverse coupler and is used for carrying out impedance compensation when receiving the coupling signal so as to improve the transmission efficiency of the radio frequency signal.
In the embodiment of the invention, the radio frequency energy collecting system firstly receives radio frequency signals through the multiband antenna, and then provides energy for the load after passing through the impedance matching circuit and the main rectifying circuit, but if the radio frequency signals received by the multiband antenna are mismatched with the main rectifying circuit, the reverse coupler can couple the radio frequency signals into coupling signals, so that the impedance compensation device performs impedance compensation according to the coupling signals, and the transmission efficiency of the radio frequency signals is improved. Therefore, the radio frequency energy collection system in the embodiment can automatically compensate the impedance according to the radio frequency signals received by the antenna, so that the radio frequency energy of various frequency bands can be collected, the transmission efficiency of the radio frequency signals is ensured, and the loss of the radio frequency energy is prevented.
In some embodiments of the invention, the impedance compensation apparatus includes: the input end of the signal generation module is connected with the coupling end of the reverse coupler, and the signal generation module is configured to generate a control signal according to the coupling signal; the input end of the impedance compensation module is connected with the multiband antenna; and a control end of the switching device is connected with the output end of the signal generation module, a first end of the switching device is connected with the output end of the impedance compensation module, a second end of the switching device is grounded, and the switching device is configured to control the first end and the second end to be closed when the control signal is received by the control end.
In some embodiments of the invention, the signal generation module comprises: the input end of the auxiliary path rectifying unit is connected with the coupling end of the reverse coupler; the auxiliary circuit energy storage unit, the charging end of auxiliary circuit energy storage unit with the output of auxiliary circuit rectification unit is connected, the discharging end of auxiliary circuit energy storage unit with the control end of switching device is connected.
In some embodiments of the invention, the signal generation module further comprises: one end of the first resistor is connected with the discharge end of the auxiliary circuit energy storage unit, and the other end of the first resistor is connected with the control end of the switching device; and one end of the second resistor is connected with the other end of the first resistor, and the other end of the second resistor is grounded.
In some embodiments of the invention, the switching device is an NPN transistor or an NMOS switching transistor.
To achieve the above object, according to a second aspect of the present invention, there is provided a control method of a radio frequency energy collecting system, the control method being applied to the radio frequency energy collecting system described in the above embodiment, the control method comprising: acquiring radio frequency signals received by the multiband antenna; when the radio frequency signal is in mismatch with the main circuit rectifying circuit, the impedance compensation device is controlled to perform impedance compensation so as to improve the transmission efficiency of the radio frequency signal.
The control method applied to the radio frequency energy collection system in the embodiment of the invention firstly obtains the radio frequency signal received by the multiband antenna, then can determine whether the current radio frequency signal is matched with the main path rectifying circuit or not through the frequency band information, and can control the impedance compensation device to carry out impedance compensation if the radio frequency signal is mismatched with the main path rectifying circuit so as to improve the transmission efficiency of the radio frequency signal. Therefore, the control method of the radio frequency energy collection system in the embodiment can automatically compensate impedance according to the radio frequency signals received by the antenna, so that radio frequency energy of various frequency bands can be collected, transmission efficiency of the radio frequency signals is guaranteed, and loss of the radio frequency energy is prevented.
In some embodiments of the invention, the impedance compensation device includes a reactive element, the controlling the impedance compensation device to perform impedance compensation includes: the reactance elements are controlled to be connected into the impedance matching circuit in a parallel mode.
In some embodiments of the invention, the control method further comprises: and when the coupling signal of the reverse coupler is larger than a preset coupling signal, determining that the radio frequency signal is mismatched with the main circuit rectifying circuit.
In some embodiments of the present invention, the coupling signal size of the reverse coupler is different for radio frequency reflection signals of different frequency bands.
To achieve the above object, an embodiment of a third aspect of the present invention provides an electronic device, which includes the radio frequency energy collecting system according to the above embodiment.
According to the radio frequency energy collection system, the electronic equipment can automatically compensate impedance according to the radio frequency signals received by the antenna, so that radio frequency energy of various frequency bands can be collected, transmission efficiency of the radio frequency signals is guaranteed, and loss of the radio frequency energy is prevented.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a block diagram of a radio frequency collection system in one embodiment of the invention;
FIG. 2 is a block diagram of a radio frequency collection system in accordance with another embodiment of the present invention;
FIG. 3 is a schematic diagram of points A and B on a Smith chart in accordance with one embodiment of the invention;
FIG. 4 is a block diagram of a radio frequency collection system in accordance with yet another embodiment of the present invention;
FIG. 5 is a block diagram of a radio frequency collection system in accordance with yet another embodiment of the present invention;
FIG. 6 is a flow chart of a control method of the RF energy collection system in an embodiment of the invention;
Fig. 7 is a block diagram of an electronic device in an embodiment of the invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The following describes a radio frequency energy collecting system, a control method thereof and an electronic device according to an embodiment of the present invention with reference to the accompanying drawings.
Fig. 1 is a block diagram of a radio frequency collection system in one embodiment of the invention.
As shown in fig. 1, the present invention proposes a radio frequency energy harvesting system 100, the radio frequency energy harvesting system 100 comprising a multi-band antenna 10, an impedance matching circuit 20, a main rectification circuit 30, an impedance compensation device 40, and a back coupler 50.
Wherein the multi-band antenna 10 is used for receiving radio frequency signals of various frequency bands; an input terminal of the impedance matching circuit 20 is connected to the multiband antenna 10 for matching an impedance between the multiband antenna 10 and a subsequent circuit of the impedance matching circuit 20; the input end of the main circuit rectifying circuit 30 is connected with the output end of the impedance matching circuit 20, and is used for rectifying the radio frequency signal passing through the impedance matching circuit 20 into a direct current signal and providing the direct current signal to a load; an input end of the reverse coupler 50 is connected with an output end of the impedance matching circuit 20, an output end of the reverse coupler 50 is connected with an input end of the main rectifying circuit 30, an isolation end of the reverse coupler 50 is grounded through an adjustable impedance network, and the reverse coupler 50 is configured to reflect the radio frequency signal into a coupled signal when the radio frequency signal received by the multiband antenna 10 is mismatched with the main rectifying circuit 30; one end of the impedance compensation device 40 is connected to the input end of the impedance matching circuit 20, and the other end of the impedance compensation device 40 is connected to the coupling end of the reverse coupler, so as to perform impedance compensation when the multiband antenna 10 receives the coupling signal, thereby improving the transmission efficiency of the radio frequency signal.
Specifically, the rf energy collecting system 100 is located in an external space where multiple frequency bands of wireless energy exist, and the multiband antenna 10 can receive rf signals in multiple frequency bands in the space, for example, can receive wireless energy of 900mHz or 2400 mHz. After the multiband antenna 10 receives the radio frequency signal with the corresponding frequency, the radio frequency signal can be sent to the main circuit rectifying circuit 30 through the impedance matching circuit 20, and the transmission efficiency and performance of the circuit can be improved through the design of the impedance matching circuit 20, and the reflection and loss of the signal can be reduced. After passing through the impedance matching circuit 20, the radio frequency signal enters the main circuit rectifying circuit 30 through the input end of the main circuit rectifying circuit 30 to carry out rectifying treatment, and the main circuit rectifying circuit 30 can rectify the radio frequency signal into a direct current signal and output the direct current signal to a load. In some embodiments, the load may be a power management module, such as including, but not limited to, a hysteretic voltage comparator, a DC-DC converter, an energy storage capacitor, and the like.
If the frequency band received by the multiband antenna 10 is mismatched with the main rectifying circuit 30 through the current impedance matching circuit 20, the back coupler 50 will generate a large amount of reflected signals based on the rf signal, so that the energy received by the multiband antenna 10 is not fully utilized, and therefore, when the rf signal received by the multiband antenna 10 is mismatched with the main rectifying circuit 30, the impedance compensation is performed by the impedance compensation device 40, so that the impedance of the compensated circuit can be matched with the rf signal of the current frequency band, and the transmission efficiency of the rf signal is improved, and in particular, the impedance compensation device 40 can perform the impedance compensation operation when the coupling end of the back coupler 50 outputs a sufficiently large coupling signal.
In some embodiments of the present invention, as shown in fig. 2, the impedance compensation apparatus 40 includes: a signal generation module 401, an impedance compensation module 402, and a switching device 403.
Wherein an input of the signal generation module 401 is connected to a coupling end of the back coupler 50, the signal generation module 401 being configured to generate a control signal in dependence of the coupling signal; an input terminal of the impedance compensation module 402 is connected to the multiband antenna 10; a control terminal of the switching device 403 is connected to the output terminal of the signal generating module 401, a first terminal of the switching device 403 is connected to the output terminal of the impedance compensating module 402, a second terminal of the switching device 403 is grounded, and the switching device 403 is configured such that the first terminal and the second terminal are closed when the control signal is received by the control terminal.
Specifically, the input end of the reverse coupler 50 is connected to the output end of the impedance matching circuit 20, the output end is connected to the input end of the main rectifying circuit 30, the isolation end is grounded through an adjustable impedance network, and the coupling end is connected to the input end of the signal generating module 401. It should be noted that, if the radio frequency signal in the current frequency band is adapted to the main circuit rectifier 30, the back coupler 50 generates almost no coupling signal because the reflected signal is low and the coupling degree of the back coupler in the current frequency band is low, so the signal generating module 401 does not generate a control signal to control the switching device 403, so that the impedance compensating module 402 does not need to perform impedance compensation and is not connected to the circuit. If the radio frequency signal in the current frequency band is mismatched with the main rectifying circuit 30, a large amount of reflected signals will occur, so the reverse coupler 50 will generate a coupling signal according to the reflected signals, and the coupling signal can be input into the signal generating module 401, so that the signal generating module 401 generates a control signal, and the switching device 403 completes closing between the first end and the second end under the control of the control signal, so that the impedance compensation module 402 can be connected into the circuit through the switching device 403 for performing impedance compensation processing.
More specifically, in a specific embodiment, two rf signals with frequencies of 900mHz and 2400mHz are taken as an example, and initially, the space is mainly occupied by the 900mHz rf signal, and since the impedance matching circuit 20 is adapted to 900mHz, the back coupler 50 does not generate a coupling signal, and therefore the impedance compensation module 402 does not access the circuit, so that the input impedance of the circuit at the later stage of the point a and the point B in the figure is the same, and in this embodiment, the impedance may be specifically 50+j×0. In this embodiment, if the main radio frequency signal in space is converted to 2400mHz, the input end of the main rectifying circuit 30 generates a reflected signal, the input impedance of the post-stage circuit at point a becomes 30+j×25, and the back-stage circuit at point a does not conform to the initial set value of the impedance matching circuit 20, so that the impedance compensating module 402 may be added to the circuit to perform impedance compensation to improve the transmission efficiency of the radio frequency signal, after the impedance compensating module 402 is added to the circuit, the input impedance of the post-stage circuit corresponding to point B changes, wherein the input impedance of the post-stage circuit corresponding to point a is 30+j×25, and if the impedance compensation is not performed, the input impedance of the post-stage circuit at point B is 30+j×25, which does not conform to the initial set value of the impedance matching circuit 20. Further, as shown in fig. 3, point 1 is 30+j×25, which is the input impedance of the post-stage circuit at point a at 900mHz, and if the impedance compensation module 402 is not used for compensation, the input impedance of the post-stage circuit at point B is the same as 30+j×25, but after the compensation module 402 (the capacitance of 1.1 pF) is used for compensation, the input impedance of the post-stage circuit at point B may become 50+j×0, which is exactly matched with the output impedance of the multiband antenna 10.
When the rf signal in the space changes from 2400mHz to 900mHz, the back coupler 50 stops working, and the impedance compensation module 402 cuts off the impedance compensation of the circuit, and returns to the initial state.
In some embodiments of the present invention, as shown in fig. 4, the signal generation module 401 includes: an auxiliary path rectifying unit 4011 and an auxiliary path energy storage unit 4012.
The input end of the auxiliary circuit rectifying unit 4011 is connected with the coupling end of the reverse coupler 50; the charging end of the auxiliary energy storage unit 4012 is connected with the output end of the auxiliary rectifying unit 4011, and the discharging end of the auxiliary energy storage unit 4012 is connected with the control end of the switching device 403.
Specifically, after the reverse coupler 50 can generate the coupling signal, the coupling signal is rectified by the auxiliary rectification unit 4011, the auxiliary energy storage unit 4012 can be charged by the dc power after the rectification, and the control signal can be provided to the switching device 403 after the auxiliary energy storage unit 4012 finishes charging, so as to complete the control of the switching device 403.
More specifically, the auxiliary energy storage unit 4012 in the embodiment may be an energy storage capacitor, the coupling signal can charge the energy storage capacitor after being rectified by the auxiliary rectification unit 4011, and the voltage of the energy storage capacitor rises after the energy storage capacitor is charged, so that the first end and the second end of the switching device 403 can be controlled to be turned on.
In some embodiments of the present invention, as shown in fig. 5, the signal generating module 401 further includes: a first resistor R1 and a second resistor R2.
One end of the first resistor R1 is connected with the discharge end of the auxiliary circuit energy storage unit 4012, and the other end of the first resistor R1 is connected with the control end of the switching device 403; one end of the second resistor R2 is connected with the other end of the first resistor R1, and the other end of the second resistor R2 is grounded.
Specifically, the first resistor R1 and the second resistor R2 in the present embodiment can perform current-limiting voltage-dividing processing on the control signal output from the auxiliary energy storage unit 4012, so as to protect the switching device 403. It should be noted that, in this embodiment, specific resistance values of the first resistor R1 and the second resistor R2 may be set according to actual circuit requirements, or may be selected according to type parameters of the switching device 403, which is not limited herein specifically.
In the above embodiment, the main circuit rectifying circuit 30 and the auxiliary circuit rectifying unit 4011 have a boosting function, and can boost the radio frequency signal or the coupled signal, and more specifically, the rectifying circuit in the present invention may be a voltage doubler rectifying circuit.
In some embodiments of the present invention, the switching device 403 is an NPN transistor or an NMOS transistor, where, taking an NPN transistor as an example, the first end of the switching device 403 is a collector of the NPN transistor, the second end of the switching device 403 is an emitter of the NPN transistor, and the control end of the switching device 403 is a base of the NPN transistor.
Specifically, the voltage of the control signal received at the base of the NPN transistor exceeds its turn-on voltage, so that the collector and the emitter of the NPN transistor can be turned on, thereby enabling the impedance compensation module 402 to be connected to the circuit. Optionally, the impedance compensation module 402 may include a capacitance, an inductance, and/or a resistance.
It should be further noted that, by adjusting the resistance value of the adjustable impedance network in the present invention, the rf energy collecting system 100 can adapt to more rf signals, not limited to setting rf signals in certain frequency bands, and in a specific embodiment, when the impedance value of the adjustable impedance network is in a mismatched frequency band, the output energy of the auxiliary rectifying unit 4011 is detected, until the output energy of the auxiliary rectifying unit 4011 is maximum, the adjustment of the adjustable impedance network is stopped, and the purpose is to maximize the energy coupled to the auxiliary rectifying unit 4011 when the signals are mismatched. It will be appreciated that by adjusting the resistance of the adjustable impedance network, adjustments to the isolation and directivity properties of the back coupler 50 can be made.
In summary, the rf energy collecting system 100 according to the embodiment of the present invention directly identifies the current rf signal automatically through the reverse coupler 50, and if the current rf signal is mismatched with the main rectifying circuit 30, a coupling signal can be generated, so that the impedance compensation module 402 can be controlled to compensate the impedance, so as to ensure that the output impedance of the multiband antenna 10 accords with the set value of the impedance matching circuit 20. Therefore, by the rf energy collecting system 100 of the present invention, even if the rf signal in the space is changed, the impedance can be automatically compensated in time, so that the comprehensive conversion efficiency is improved, and no additional power supply is required to be prepared for supplying power, so that no additional energy consumption is caused.
Fig. 6 is a flow chart of a control method of the rf energy collection system according to an embodiment of the invention.
Further, as shown in fig. 6, the present invention proposes a control method applied to the rf energy collection system in any of the above embodiments, where the control method includes the following steps:
S10, acquiring radio frequency signals received by the multiband antenna.
And S20, when the radio frequency signal is in mismatch with the main circuit rectifying circuit, controlling the impedance compensation device to perform impedance compensation so as to improve the transmission efficiency of the radio frequency signal.
Specifically, the control method of the present embodiment is specifically used to describe the working process of the rf energy collecting system 100 in the foregoing embodiment, firstly, the rf signal received by the multiband antenna 10 may be obtained, and then, when the rf signal is mismatched with the main rectification circuit 30, the back coupler 50 may couple the rf reflected signal into a coupled signal, so that the impedance compensation device 40 may perform impedance compensation according to the coupled signal, so as to improve the transmission efficiency of the rf signal. It should be understood that, during the design process, the impedance matching circuit 20 may be designed corresponding to a certain frequency band, and the frequency band may be a frequency band corresponding to the radio frequency signal most commonly collected by the radio frequency energy collecting system 100, i.e. a preset frequency band. When the obtained frequency band information is different from the preset frequency band, it may be determined that the current radio frequency signal is mismatched with the main rectifying circuit 30, and of course, in some embodiments, it may also be determined that the absolute value of the difference between the obtained frequency band information and the preset frequency band is greater than the preset value, and it may be determined that the current radio frequency signal is mismatched with the main rectifying circuit 30.
In some embodiments of the present invention, the impedance compensation device 40 includes a reactive element, and the controlling the impedance compensation device 40 to perform impedance compensation includes: the reactive elements are controlled to be connected in parallel to the impedance matching circuit 20.
Specifically, in this embodiment, the impedance compensation device 40 includes a reactance element, and the transmission efficiency of the radio frequency signal can be adjusted by adjusting whether the reactance element is connected to the impedance matching circuit 20, and specifically, when the current radio frequency signal is mismatched with the main rectification circuit 30, the reactance element is controlled to be connected in parallel to the impedance matching circuit 20, so that the transmission efficiency of the radio frequency signal can be at a maximum value.
In some embodiments of the present invention, when it is determined that the frequency band of the radio frequency signal is mismatched with the main rectifying circuit 30, the coupled signal of the reverse coupler 50 may be specifically determined, and when the coupled signal is greater than the preset coupled signal, it may be determined that the frequency band of the current radio frequency signal is mismatched with the main rectifying circuit 30, where the sizes of the coupled signals that can be reflected by the radio frequency signals in different frequency bands are different.
Specifically, in this embodiment, two frequency bands may be set, when the multiband antenna 10 receives the radio frequency signal in the first frequency band, the reverse coupler 50 will hardly reflect the coupled signal, when the multiband antenna 10 receives the radio frequency signal in the second frequency band, the reverse coupler 50 can reflect the radio frequency signal into the coupled signal, and then the signal generating module 401 generates a control signal under the action of the coupled signal to control the switching device 403 to be closed, so that the impedance compensation module 402 may be connected in parallel to the impedance matching circuit 20, and the adjustment of the impedance matching circuit 20 is completed, so that the radio frequency signal in the second frequency band can also be smoothly transmitted to the main rectifying circuit 30.
It should be noted that, for the specific implementation of the control method of the rf energy collection system in this embodiment, reference may be made to the specific implementation of the rf energy collection system in the foregoing embodiment, and in order to avoid redundancy, a detailed description is omitted here.
In summary, the control method of the radio frequency energy collection system in the embodiment of the invention can collect radio frequency energy in various frequency bands, ensure the transmission efficiency of radio frequency signals and prevent loss of the radio frequency energy.
Fig. 7 is a block diagram of an electronic device in an embodiment of the invention.
Further, the present invention proposes an electronic device 300, as shown in fig. 7, where the electronic device 300 includes the rf energy collection system 100 in the above embodiment.
According to the radio frequency energy collection system, the electronic equipment can automatically compensate impedance according to the radio frequency signals received by the antenna, so that radio frequency energy of various frequency bands can be collected, transmission efficiency of the radio frequency signals is guaranteed, and loss of the radio frequency energy is prevented.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, as used in embodiments of the present invention, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or as implying any particular number of features in the present embodiment. Thus, a feature of an embodiment of the invention that is defined by terms such as "first," "second," etc., may explicitly or implicitly indicate that at least one such feature is included in the embodiment. In the description of the present invention, the word "plurality" means at least two or more, for example, two, three, four, etc., unless explicitly defined otherwise in the embodiments.
In the present invention, unless explicitly stated or limited otherwise in the examples, the terms "mounted," "connected," and "fixed" as used in the examples should be interpreted broadly, e.g., the connection may be a fixed connection, may be a removable connection, or may be integral, and it may be understood that the connection may also be a mechanical connection, an electrical connection, etc.; of course, it may be directly connected, or indirectly connected through an intermediate medium, or may be in communication with each other, or in interaction with each other. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific embodiments.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (10)
1. A radio frequency energy harvesting system, comprising:
A multi-band antenna for receiving radio frequency signals of various frequency bands;
An input end of the impedance matching circuit is connected with the multiband antenna and is used for matching the impedance between the multiband antenna and a subsequent circuit of the impedance matching circuit;
The main path rectifying circuit is used for rectifying the radio frequency signal passing through the impedance matching circuit into a direct current signal and providing the direct current signal to a load;
The input end of the reverse coupler is connected with the output end of the impedance matching circuit, the output end of the reverse coupler is connected with the input end of the main rectifying circuit, the isolation end of the reverse coupler is grounded through an adjustable impedance network, and the reverse coupler is configured to couple a reflected signal of a radio frequency signal received by the multiband antenna into a coupled signal when the radio frequency signal is mismatched with the main rectifying circuit;
And one end of the impedance compensation device is connected with the input end of the impedance matching circuit, and the other end of the impedance compensation device is connected with the coupling end of the reverse coupler and is used for carrying out impedance compensation when receiving the coupling signal so as to improve the transmission efficiency of the radio frequency signal.
2. The radio frequency energy harvesting system of claim 1, wherein the impedance compensation means comprises:
the input end of the signal generation module is connected with the coupling end of the reverse coupler, and the signal generation module is configured to generate a control signal according to the coupling signal;
The input end of the impedance compensation module is connected with the multiband antenna;
And a control end of the switching device is connected with the output end of the signal generation module, a first end of the switching device is connected with the output end of the impedance compensation module, a second end of the switching device is grounded, and the switching device is configured to control the first end and the second end to be closed when the control signal is received by the control end.
3. The radio frequency energy harvesting system of claim 2, wherein the signal generation module comprises:
The input end of the auxiliary path rectifying unit is connected with the coupling end of the reverse coupler;
The auxiliary circuit energy storage unit, the charging end of auxiliary circuit energy storage unit with the output of auxiliary circuit rectification unit is connected, the discharging end of auxiliary circuit energy storage unit with the control end of switching device is connected.
4. The radio frequency energy harvesting system of claim 3, wherein the signal generation module further comprises:
one end of the first resistor is connected with the discharge end of the auxiliary circuit energy storage unit, and the other end of the first resistor is connected with the control end of the switching device;
And one end of the second resistor is connected with the other end of the first resistor, and the other end of the second resistor is grounded.
5. The rf energy harvesting system of any of claims 2-4, wherein the switching device is an NPN transistor or an NMOS switching transistor.
6. A control method of a radio frequency energy harvesting system, applied to the radio frequency energy harvesting system of any one of claims 1-5, characterized in that the control method comprises:
acquiring radio frequency signals received by the multiband antenna;
When the radio frequency signal is in mismatch with the main circuit rectifying circuit, the impedance compensation device is controlled to perform impedance compensation so as to improve the transmission efficiency of the radio frequency signal.
7. The method of claim 6, wherein the impedance compensation device comprises a reactive element, and wherein the controlling the impedance compensation device to perform impedance compensation comprises:
the reactance elements are controlled to be connected into the impedance matching circuit in a parallel mode.
8. The method of controlling a radio frequency energy harvesting system of claim 6, further comprising:
And when the coupling signal of the reverse coupler is larger than a preset coupling signal, determining that the frequency band of the radio frequency signal is mismatched with the main circuit rectifying circuit.
9. The method of claim 8, wherein the reverse coupler has different coupling signal sizes for different frequency bands of the rf reflection signal.
10. An electronic device comprising the radio frequency energy harvesting system of any of claims 1-5.
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