Magnetic field energy collection device and magnetic field energy collection method based on double-resonance band-pass network

Abstract

The invention discloses a magnetic field energy collection device and a magnetic field energy collection method based on a double-resonance band-pass network, and belongs to the technical field of energy collection devices, and the magnetic field energy collection device is formed by connecting a non-intrusive magnetic energy collector, the double-resonance band-pass network and a load in series. The double-resonance band-pass network comprises a first resonance capacitor, a first resonance inductor, a coupling capacitor, a second resonance capacitor and a second resonance inductor; the first end of the first resonant capacitor is connected between the first resonant inductor and the coupling capacitor; the second end of the first resonant capacitor is connected between the load and the non-intrusive magnetic energy collector; the first end of the second resonant capacitor is connected between the second resonant inductor and the coupling capacitor; the second end of the second resonant capacitor is connected between the load and the non-intrusive magnetic energy collector, and limits the relation between the quality factor and the coupling coefficient of the double-resonant band-pass network. The problem that in the prior art, an energy collecting device is low in energy taking output power can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy harvesting devices, and in particular to a magnetic field energy harvesting device and a magnetic field energy harvesting method based on a dual-resonance bandpass network. Background Art

[0002] Magnetic field energy harvesters have attracted much attention in the field of powering sensors in power grids due to their advantages of being less affected by the environment and being flexible and reliable. Among them, non-invasive magnetic field energy harvesters (FSMEH) can be flexibly installed in AC magnetic field environments and can be used in scenarios other than power grids, such as the magnetic field environments of aircraft and railways. The electromagnetic field in the transmission and distribution converter is generated by the rapid changes in voltage and current when the power device switches, and the frequency ranges from several kilohertz to several megahertz, with a wide range of characteristics. Due to the large amount of parasitic inductance and parasitic capacitance in the system, the high-speed switching voltage and current will also release high-frequency stray electromagnetic energy into space through these parasitic parameters. If electromagnetic energy at different frequencies is collected, the magnetic field energy output can be greatly improved within a limited volume.

[0003] However, existing magnetic field energy harvesting generally only focuses on magnetic field energy harvesting at a single frequency point. That is, current magnetic field energy harvesting devices can only collect magnetic field energy at a single frequency, ignoring the magnetic field energy at other frequency components, and are unable to collect as much effective energy as possible in a wide frequency range, resulting in low energy output power. Summary of the Invention

[0004] The present invention provides a magnetic field energy collection device and a magnetic field energy collection method based on a dual-resonance bandpass network, which can solve the problem of low energy output power of energy collection devices in the prior art.

[0005] In order to solve the above technical problems, the present invention provides a magnetic field energy harvesting device based on a dual-resonance bandpass network, comprising: a non-invasive magnetic energy harvester, a dual-resonance bandpass network and a load;

[0006] The dual-resonance bandpass network includes a first resonant capacitor, a first resonant inductor, a coupling capacitor, a second resonant capacitor and a second resonant inductor;

[0007] The first end of the non-invasive magnetic energy collector is electrically connected to the first end of the first resonant inductor;

[0008] The second end of the first resonant inductor is electrically connected to the first end of the coupling capacitor;

[0009] The second end of the coupling capacitor is electrically connected to the first end of the second resonant inductor;

[0010] The second end of the second resonant inductor is electrically connected to the first end of the load;

[0011] The second end of the load is electrically connected to the second end of the non-invasive magnetic energy collector;

[0012] The first end of the first resonant capacitor is electrically connected to the second end of the first resonant inductor;

[0013] The second end of the first resonant capacitor is electrically connected to the second end of the non-invasive magnetic energy collector;

[0014] The first end of the second resonant capacitor is electrically connected to the second end of the coupling capacitor;

[0015] The second end of the second resonant capacitor is electrically connected to the second end of the load;

[0016] The quality factor and coupling coefficient of the dual-resonance bandpass network meet the following conditions:

[0017]

[0018] Where Q is the quality factor of the dual-resonance bandpass network; k is the coupling coefficient of the dual-resonance bandpass network.

[0019] As a preferred solution, the non-invasive magnetic energy collector comprises: an AC source and a coil resistor;

[0020] The first end of the AC source is electrically connected to the first end of the coil resistor;

[0021] The second end of the coil resistor is the first end of the non-invasive magnetic energy collector;

[0022] The second end of the AC source is the second end of the non-invasive magnetic energy collector.

[0023] As a preferred solution, the quality factor of the dual-resonance bandpass network satisfies the following formula:

[0024]

[0025] Where Q is the quality factor of the dual-resonance bandpass network; f1 is the upper limit of the bandpass frequency; and f2 is the lower limit of the bandpass frequency.

[0026] As a preferred solution, the inductance of the first resonant inductor satisfies the following formula:

[0027]

[0028] Where L1 is the inductance of the first resonant inductor; R1 is the resistance of the coil; Q is the quality factor of the dual-resonance bandpass network; ω0 is the reference value of the resonant angular frequency.

[0029] As a preferred solution, the resonant angular frequency reference value satisfies the following formula:

[0030]

[0031] Wherein, ω0 is the reference value of the resonant angular frequency of the dual-resonance bandpass network; f1 is the upper limit of the bandpass frequency; f2 is the lower limit of the bandpass frequency; ω m To match the angular frequency.

[0032] As a preferred solution, the matching angular frequency is the difference between two solution values ​​of the parameter optimization constraint condition;

[0033] Wherein, the parameter optimization constraints are:

[0034]

[0035] Where Q is the quality factor of the dual-resonance bandpass network; k is the coupling coefficient of the dual-resonance bandpass network; and ω is the angular frequency.

[0036] As a preferred solution, the inductance of the second resonant inductor satisfies the following formula:

[0037]

[0038] Where L1 is the inductance of the second resonant inductor; R2 is the resistance of the load; Q is the quality factor of the dual-resonant bandpass network; ω0 is the reference value of the resonant angular frequency.

[0039] As a preferred solution, the capacitance value of the first resonant capacitor, the capacitance value of the second resonant capacitor and the capacitance value of the coupling capacitor satisfy the following formula:

[0040]

[0041]

[0042] Where C1 is the capacitance value of the first resonant capacitor; C2 is the capacitance value of the second resonant capacitor; C M is the capacitance value of the coupling capacitor; R1 is the resistance value of the non-invasive magnetic energy collector load; R2 is the resistance value of the load; Q is the quality factor of the dual-resonance bandpass network; k is the coupling coefficient of the dual-resonance bandpass network; ω0 is the reference value of the resonant angular frequency.

[0043] As a preferred solution, the upper limit of the bandpass frequency is 150 Hz, and the lower limit of the bandpass frequency is 50 Hz.

[0044] Accordingly, the present invention provides a magnetic field energy harvesting method, which is applicable to the magnetic field energy harvesting device based on the dual-resonance bandpass network as described above;

[0045] The magnetic field energy collection method comprises:

[0046] placing a non-invasive magnetic energy collector in an AC magnetic field, and controlling the non-invasive magnetic energy collector to convert the AC magnetic field into an AC induced voltage;

[0047] The dual-resonance bandpass network transmits the AC induced voltage to a load, so as to realize magnetic field energy collection at the upper pass frequency limit and the pass frequency of the dual-resonance bandpass network.

[0048] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0049] The present invention provides a magnetic field energy harvesting device based on a dual-resonance bandpass network, which is formed by connecting a non-invasive magnetic energy collector, a dual-resonance bandpass network, and a load in series. The dual-resonance bandpass network includes a first resonant capacitor, a first resonant inductor, a coupling capacitor, a second resonant capacitor, and a second resonant inductor; the first end of the first resonant capacitor is connected between the first resonant inductor and the coupling capacitor; the second end of the first resonant capacitor is connected between the load and the non-invasive magnetic energy harvester; the first end of the second resonant capacitor is connected between the second resonant inductor and the coupling capacitor; the second end of the second resonant capacitor is connected between the load and the non-invasive magnetic energy harvester, and defines the relationship between the quality factor and coupling coefficient of the dual-resonance bandpass network. By defining the relationship between the quality factor and coupling coefficient of the dual-resonance bandpass network, the present invention controls the angular frequency of the dual-resonance bandpass network to be greater than zero, so that the dual-resonance bandpass network achieves maximum energy output at two frequencies, thereby improving the energy output power of the magnetic field energy harvesting device. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0051] Figure 1 A schematic structural diagram of an embodiment of a magnetic field energy harvesting device based on a dual-resonance bandpass network provided by the present invention;

[0052] Figure 2 This is an output power curve diagram provided by the present invention. DETAILED DESCRIPTION

[0053] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions in this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0055] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0056] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0057] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0058] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0059] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0060] To solve the problem of low energy output power of energy harvesting devices in the prior art, an embodiment of the present invention provides a magnetic field energy harvesting device based on a dual-resonance bandpass network, the device comprising: a non-invasive magnetic energy harvester, a dual-resonance bandpass network, and a load;

[0061] The dual-resonance bandpass network includes a first resonant capacitor, a first resonant inductor, a coupling capacitor, a second resonant capacitor and a second resonant inductor;

[0062] The first end of the non-invasive magnetic energy collector is electrically connected to the first end of the first resonant inductor;

[0063] The second end of the first resonant inductor is electrically connected to the first end of the coupling capacitor;

[0064] The second end of the coupling capacitor is electrically connected to the first end of the second resonant inductor;

[0065] The second end of the second resonant inductor is electrically connected to the first end of the load;

[0066] The second end of the load is electrically connected to the second end of the non-invasive magnetic energy collector;

[0067] The first end of the first resonant capacitor is electrically connected to the second end of the first resonant inductor;

[0068] The second end of the first resonant capacitor is electrically connected to the second end of the non-invasive magnetic energy collector;

[0069] The first end of the second resonant capacitor is electrically connected to the second end of the coupling capacitor;

[0070] The second end of the second resonant capacitor is electrically connected to the second end of the load;

[0071] The quality factor and coupling coefficient of the dual-resonance bandpass network meet the following conditions:

[0072]

[0073] Where Q is the quality factor of the dual-resonance bandpass network; k is the coupling coefficient of the dual-resonance bandpass network.

[0074] In an embodiment of the present invention, a magnetic field energy harvesting device is composed of a non-invasive magnetic energy collector, a dual-resonance bandpass network and a load. The dual-resonance bandpass network is composed of two resonant capacitors, a coupling capacitor and two resonant inductors. The first end of the first resonant capacitor is connected between the first resonant inductor and the coupling capacitor; the second end of the first resonant capacitor is connected between the load and the non-invasive magnetic energy collector; the first end of the second resonant capacitor is connected between the second resonant inductor and the coupling capacitor; the second end of the second resonant capacitor is connected between the load and the non-invasive magnetic energy collector. By limiting the relationship between the quality factor and the coupling coefficient of the dual-resonance bandpass network, the angular frequency of the dual-resonance bandpass network is controlled to be greater than zero, so that the dual-resonance bandpass network can achieve maximum energy output at two frequencies, thereby improving the energy output power of the magnetic field energy harvesting device. In practical applications, it is necessary to wind a non-invasive magnetic energy harvester with equal parameter values ​​according to the inductance value calculated from the resonant network.

[0075] As a preferred solution of this embodiment, the non-invasive magnetic energy collector includes: an AC source and a coil resistor;

[0076] The first end of the AC source is electrically connected to the first end of the coil resistor;

[0077] The second end of the coil resistor is the first end of the non-invasive magnetic energy collector;

[0078] The second end of the AC source is the second end of the non-invasive magnetic energy collector.

[0079] See also Figure 1 , is a structural diagram of an embodiment of a magnetic field energy harvesting device based on a dual-resonance bandpass network provided by the present invention. The dual-resonance bandpass network consists of a first resonant capacitor C1, a first resonant inductor L1, and a coupling capacitor C M , the second resonant capacitor C2 and the second resonant inductor L2. Based on the principle of electromagnetic induction, the non-invasive magnetic field energy harvester can convert the AC magnetic field in the environment into an AC induced voltage at both ends of the collector coil. Its structure in the AC magnetic field can be equivalent to an AC source V s The magnetic field energy harvesting device is composed of a non-invasive magnetic energy harvester, a dual-resonance bandpass network and a load R2 in series. M , and the second resonant inductor L2 are connected in series between the non-invasive magnetic energy collector and the load R2; one end of the first resonant capacitor C1 is connected to the first resonant inductor L1 and the coupling capacitor C MThe other end is connected between the load R2 and the non-intrusive magnetic energy collector; one end of the second resonant capacitor C2 is connected between the second resonant inductor L2 and the coupling capacitor C M The other end is connected between the load R2 and the non-intrusive magnetic energy collector.

[0080] In an embodiment of the present invention, after determining the component architecture of the magnetic field energy harvesting device, Figure 1 A to E in the figure represent the impedance within each box in the frequency domain. The impedance values ​​can be expressed as:

[0081] A=sL2+R2

[0082]

[0083] E=R1+sL1+D

[0084] Where A is the impedance value of the magnetic field energy harvesting device including the load R2 and the second resonant inductor L2; B is the impedance value of the load R2, the second resonant inductor L2 and the second resonant capacitor C2; C is the impedance value of the load R2, the second resonant inductor L2, the second resonant capacitor C2 and the coupling capacitor C M The impedance value of the load R2, the second resonant inductor L2, the second resonant capacitor C2, the coupling capacitor C M and the impedance value of the first resonant capacitor C1; E is the impedance of the load R2, the second resonant inductor L2, the second resonant capacitor C2, the coupling capacitor C M , the impedance values ​​of the first resonant capacitor C1, the first resonant inductor L1 and the non-invasive magnetic energy collector load R1; s is a complex frequency variable.

[0085] After determining the impedance relationship of the magnetic field energy harvesting device, the transfer function of the magnetic field energy harvesting device can be constructed as follows:

[0086]

[0087]

[0088] Where H(s) is the transfer function; s is the complex frequency variable; R1 is the resistance of the non-invasive magnetic energy harvester load; R2 is the resistance of the load; C M is the capacitance value of the coupling capacitor; C1 is the capacitance value of the first resonant capacitor; C2 is the capacitance value of the second resonant capacitor; L1 is the inductance value of the first resonant inductor; L2 is the inductance value of the second resonant inductor.

[0089] In the embodiments of the present invention, the quality factor Q is introduced to describe the quality of the resonant circuit. The larger the Q value, the narrower the passband width and the better the circuit's selectivity. Conversely, the smaller the Q value, the wider the passband width and the worse the selectivity. Therefore, using the resonance principle, the component parameter correlation relationship of the magnetic field energy harvesting device can be constructed as follows:

[0090]

[0091] Where, R1 is the resistance of the non-invasive magnetic energy collector load; R2 is the resistance of the load; C M is the capacitance value of the coupling capacitor; C1 is the capacitance value of the first resonant capacitor; C2 is the capacitance value of the second resonant capacitor; L1 is the inductance value of the first resonant inductor; L2 is the inductance value of the second resonant inductor; Q is the quality factor of the dual resonant bandpass network; k is the coupling coefficient of the dual resonant bandpass network; ω0 is the reference value of the resonant angular frequency.

[0092] In the embodiment of the present invention, the complex frequency variable in the transfer function of the magnetic field energy harvesting device is controlled to be an imaginary variable. Based on the element parameter association relationship, the transfer function is converted into the frequency response of the magnetic field energy harvesting device. Then, s=jω and the first resonant capacitor C1, the first resonant inductor L1, the coupling capacitor C M , the component values ​​of the second resonant capacitor C2 and the second resonant inductor L2 are substituted into the transfer function to obtain the frequency response of the magnetic field energy harvesting device:

[0093]

[0094] Where H(jω) is the frequency response; Q is the quality factor of the dual-resonance bandpass network; k is the coupling coefficient of the dual-resonance bandpass network; ω0 is the resonant angular frequency reference value; and ω is the angular frequency.

[0095] In the embodiment of the present invention, the preset maximum flatness characteristic requirement is: the gain in the passband remains substantially unchanged, and the gain is attenuated in the stopband. Therefore, when the wideband passband circuit achieves the maximum flatness characteristic, it is necessary to satisfy the equation |H(jω)|=1 and have only one positive real root, that is:

[0096]

[0097] Simplifying the above equation, we get:

[0098]

[0099] The above is a 2 The solution of the quadratic equation is:

[0100]

[0101] Since ω has only one positive real root when the preset maximum flatness requirement is met, it can be expressed as 2 There is only one positive real root, then the following relationship should be satisfied:

[0102]

[0103] According to the above formula, the coupling coefficient k and the quality factor Q need to satisfy the following relationship:

[0104]

[0105] Therefore, based on the preset maximum flatness requirement and the frequency response of the magnetic field energy harvesting device, the basic parameter constraints can be constructed:

[0106]

[0107] Where Q is the quality factor of the dual-resonance bandpass network; k is the coupling coefficient of the dual-resonance bandpass network.

[0108] In the embodiment of the present invention, the preset effective gain requirement is: the bandwidth corresponding to the amplitude equal to the square root of two times the maximum gain is 3dB, and this part of the gain is generally considered to be effective. Therefore, in order to calculate the 3dB bandwidth, it is necessary to find Similar to the above simplification steps, the parameter optimization constraints can be obtained;

[0109]

[0110] Where Q is the quality factor of the dual-resonance bandpass network; k is the coupling coefficient of the dual-resonance bandpass network; and ω is the angular frequency.

[0111] As a preferred solution of this embodiment, the quality factor of the dual-resonance bandpass network satisfies the following formula:

[0112]

[0113] Where Q is the quality factor of the dual-resonance bandpass network; f1 is the upper limit of the bandpass frequency; and f2 is the lower limit of the bandpass frequency.

[0114] In embodiments of the present invention, the magnetic field energy harvesting device of the present invention can be applied to different passband frequencies. The quality factor of the dual-resonance bandpass network can be calculated based on the upper and lower passband frequency limits within the passband frequency range of the dual-resonance bandpass network. Based on the quality factor, the various components of the magnetic field energy harvesting device can be analyzed to determine the parameter values ​​of each component.

[0115] As a preferred solution of this embodiment, after the quality factor is calculated, according to the formula The coupling coefficient can be calculated.

[0116] In the embodiment of the present invention, after the quality factor and coupling coefficient are calculated, the constraint conditions are optimized according to the parameters. The two real roots of the angular frequency can be calculated, namely the first angular frequency solution value ω1 and the second angular frequency solution value ω2. Then according to the formula ω m =|ω2-ω1| The matching angular frequency ω of the dual-resonance bandpass network can be calculated m .

[0117] In the embodiment of the present invention, the matching angular frequency ω of the dual-resonance bandpass network is calculated. m Then, according to the formula The resonant angular frequency reference value ω0 of the dual-resonance bandpass network can be calculated.

[0118] In the embodiment of the present invention, the calculated quality factor Q, coupling coefficient k and resonant angular frequency reference value ω0 are substituted into the component parameter association relationship to calculate the first resonant capacitor C1, the first resonant inductor L1, the coupling capacitor C M , component parameters of the second resonant capacitor C2 and the second resonant inductor L2.

[0119] In an embodiment of the present invention, after determining the parameter values ​​of the various components of the magnetic field energy harvesting device, the device can achieve high gain at both the upper and lower frequency limits of the passband frequency range of the dual-resonance bandpass network, and achieve an energy harvesting gain greater than zero within the passband frequency range. Therefore, the present invention effectively expands the frequency range of energy harvesting and increases the energy harvesting output power.

[0120] As an example of an embodiment of the present invention, it is assumed that the magnetic field energy between 50Hz and 150Hz needs to be collected. A magnetic field energy collection device based on a dual-resonance bandpass network can be designed according to the present invention, and its component parameters are as follows: the first resonant capacitor C1 is 2.55μF, the first resonant inductor L1 is 0.5653H, and the coupling capacitor C M The magnetic field energy harvesting device is designed with a first resonant capacitor C2 of 7.26μF, a second resonant inductor L2 of 0.7066H, a non-invasive magnetic energy harvester load R1 of 400Ω, and a load R2 of 400Ω. The magnetic field energy harvesting device is simulated using PSpice simulation software. In addition, a single resonant network matching only 50Hz is designed. The output characteristics of the single resonant network are simulated. Figure 2, is an output power curve provided by the present invention, comparing the output power of a dual-resonance bandpass network and a single-resonance network across load R2. Simulation results show that when the AC magnetic field environment contains both 150Hz and 50Hz (voltage ratio 1:10), the power collected by the dual-resonance bandpass network circuit exceeds the output power of a single-frequency (50Hz) matching circuit. Therefore, under different harmonic conditions in the presence of transmission line currents, the output power of the dual-resonance bandpass network is higher than that of the single-frequency matching network.

[0121] The implementation of the above embodiment has the following effects:

[0122] The present invention provides a magnetic field energy harvesting device based on a dual-resonance bandpass network. The component architecture of the magnetic field energy harvesting device is constructed based on the component connection relationship of the dual-resonance bandpass network. The magnetic field energy harvesting device comprises a non-invasive magnetic energy collector, a dual-resonance bandpass network, and a load. Based on the component architecture of the magnetic field energy harvesting device, a transmission function and a component parameter association relationship of the magnetic field energy harvesting device are respectively constructed. Based on the transmission function and the component parameter association relationship, component parameter constraints of the magnetic field energy harvesting device are constructed. The bandpass frequency range of the dual-resonance bandpass network is obtained. Based on the bandpass frequency range, the quality factor of the dual-resonance bandpass network is calculated. Component parameters of the magnetic field energy harvesting device are calculated based on the quality factor, component parameter constraints, bandpass frequency range, and component parameter association relationship. The magnetic field energy harvesting device is constructed based on the component architecture and component parameters. The present invention expands the frequency range of energy harvesting by constructing a magnetic field energy harvesting device containing a dual-resonance bandpass network. Parameters of each component of the magnetic field energy harvesting device are obtained by analyzing the bandpass frequency range of the dual-resonance bandpass network, so that an energy harvesting gain greater than zero is achieved within the bandpass frequency range, thereby effectively increasing the energy harvesting output power.

[0123] An embodiment of the present invention provides a magnetic field energy harvesting method, which is applicable to the magnetic field energy harvesting device based on the dual-resonance bandpass network as described above;

[0124] The magnetic field energy collection method comprises:

[0125] placing a non-invasive magnetic energy collector in an AC magnetic field, and controlling the non-invasive magnetic energy collector to convert the AC magnetic field into an AC induced voltage;

[0126] The dual-resonance bandpass network transmits the AC induced voltage to a load, so as to realize magnetic field energy collection at the upper pass frequency limit and the pass frequency of the dual-resonance bandpass network.

[0127] In an embodiment of the present invention, a resonant inductor is generated by a non-invasive magnetic energy harvester in an AC magnetic field environment. This coil inductance resonates with the resonant capacitor, forming a resonant network. The magnetic field energy harvesting device operates as follows: the non-invasive magnetic energy harvester converts the AC magnetic field in the environment into an AC induced voltage across the coil. The dual-resonant bandpass network transmits the AC induced voltage across the coil of the non-invasive magnetic energy harvester to the load, achieving maximum energy output at two frequencies.

[0128] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0129] The present invention provides a magnetic field energy harvesting device based on a dual-resonance bandpass network, which is formed by connecting a non-invasive magnetic energy collector, a dual-resonance bandpass network, and a load in series. The dual-resonance bandpass network includes a first resonant capacitor, a first resonant inductor, a coupling capacitor, a second resonant capacitor, and a second resonant inductor; the first end of the first resonant capacitor is connected between the first resonant inductor and the coupling capacitor; the second end of the first resonant capacitor is connected between the load and the non-invasive magnetic energy harvester; the first end of the second resonant capacitor is connected between the second resonant inductor and the coupling capacitor; the second end of the second resonant capacitor is connected between the load and the non-invasive magnetic energy harvester, and defines the relationship between the quality factor and coupling coefficient of the dual-resonance bandpass network. By defining the relationship between the quality factor and coupling coefficient of the dual-resonance bandpass network, the present invention controls the angular frequency of the dual-resonance bandpass network to be greater than zero, so that the dual-resonance bandpass network achieves maximum energy output at two frequencies, thereby improving the energy output power of the magnetic field energy harvesting device.

[0130] The specific embodiments described above further illustrate the objectives, technical solutions, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of protection of the present invention for those skilled in the art.

Claims

1. A magnetic field energy harvesting device based on a dual-resonance bandpass network, characterized in that: include: non-intrusive magnetic energy harvester, dual-resonant bandpass network, and load; The dual-resonance bandpass network includes a first resonant capacitor, a first resonant inductor, a coupling capacitor, a second resonant capacitor and a second resonant inductor; The first end of the non-invasive magnetic energy collector is electrically connected to the first end of the first resonant inductor; The second end of the first resonant inductor is electrically connected to the first end of the coupling capacitor; The second end of the coupling capacitor is electrically connected to the first end of the second resonant inductor; The second end of the second resonant inductor is electrically connected to the first end of the load; The second end of the load is electrically connected to the second end of the non-invasive magnetic energy collector; The first end of the first resonant capacitor is electrically connected to the second end of the first resonant inductor; The second end of the first resonant capacitor is electrically connected to the second end of the non-invasive magnetic energy collector; The first end of the second resonant capacitor is electrically connected to the second end of the coupling capacitor; The second end of the second resonant capacitor is electrically connected to the second end of the load; The quality factor and coupling coefficient of the dual-resonance bandpass network meet the following conditions: Where Q is the quality factor of the dual-resonance bandpass network; k is the coupling coefficient of the dual-resonance bandpass network.

2. The magnetic field energy harvesting device based on a dual-resonance bandpass network according to claim 1, characterized in that: The non-invasive magnetic energy collector includes: an AC source and a coil resistor; The first end of the AC source is electrically connected to the first end of the coil resistor; The second end of the coil resistor is the first end of the non-invasive magnetic energy collector; The second end of the AC source is the second end of the non-invasive magnetic energy collector.

3. The magnetic field energy harvesting device based on a dual-resonance bandpass network according to claim 2, characterized in that: The quality factor of the dual-resonance bandpass network satisfies the following formula: Where Q is the quality factor of the dual-resonance bandpass network; f1 is the upper limit of the bandpass frequency; and f2 is the lower limit of the bandpass frequency.

4. The magnetic field energy harvesting device based on a dual-resonance bandpass network according to claim 3, characterized in that: The inductance of the first resonant inductor satisfies the following formula: Where L1 is the inductance of the first resonant inductor; R1 is the resistance of the coil; Q is the quality factor of the dual-resonance bandpass network; ω0 is the reference value of the resonant angular frequency.

5. The magnetic field energy harvesting device based on a dual-resonance bandpass network according to claim 4, characterized in that: The resonant angular frequency reference value satisfies the following formula: Wherein, ω0 is the reference value of the resonant angular frequency of the dual-resonance bandpass network; f1 is the upper limit of the bandpass frequency; f2 is the lower limit of the bandpass frequency; ω m To match the angular frequency.

6. The magnetic field energy harvesting device based on a dual-resonance bandpass network according to claim 5, characterized in that: The matching angular frequency is the difference between two solution values ​​of the parameter optimization constraint condition; Wherein, the parameter optimization constraints are: Where Q is the quality factor of the dual-resonance bandpass network; k is the coupling coefficient of the dual-resonance bandpass network; and ω is the angular frequency.

7. The magnetic field energy harvesting device based on a dual-resonance bandpass network according to claim 6, characterized in that: The inductance of the second resonant inductor satisfies the following formula: Where L1 is the inductance of the second resonant inductor; R2 is the resistance of the load; Q is the quality factor of the dual-resonant bandpass network; ω0 is the reference value of the resonant angular frequency.

8. The magnetic field energy harvesting device based on a dual-resonance bandpass network according to claim 7, characterized in that: The capacitance values ​​of the first resonant capacitor, the second resonant capacitor, and the coupling capacitor satisfy the following formula: Where C1 is the capacitance value of the first resonant capacitor; C2 is the capacitance value of the second resonant capacitor; C M is the capacitance value of the coupling capacitor; R1 is the resistance value of the non-invasive magnetic energy collector load; R2 is the resistance value of the load; Q is the quality factor of the dual-resonance bandpass network; k is the coupling coefficient of the dual-resonance bandpass network; ω0 is the reference value of the resonant angular frequency.

9. The magnetic field energy harvesting device based on a dual-resonance bandpass network according to claim 3, characterized in that: The upper limit of the bandpass frequency is 150 Hz, and the lower limit of the bandpass frequency is 50 Hz.

10. A magnetic field energy collection method, characterized in that: Applicable to the magnetic field energy harvesting device based on the dual-resonance bandpass network as described in any one of claims 1 to 9; The magnetic field energy collection method comprises: placing a non-invasive magnetic energy collector in an AC magnetic field, and controlling the non-invasive magnetic energy collector to convert the AC magnetic field into an AC induced voltage; The dual-resonance bandpass network transmits the AC induced voltage to a load, so as to realize magnetic field energy collection at the upper pass frequency limit and the pass frequency of the dual-resonance bandpass network.

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