CN115173577B - Energy taking circuit and system - Google Patents
Energy taking circuit and system Download PDFInfo
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- CN115173577B CN115173577B CN202210985458.1A CN202210985458A CN115173577B CN 115173577 B CN115173577 B CN 115173577B CN 202210985458 A CN202210985458 A CN 202210985458A CN 115173577 B CN115173577 B CN 115173577B
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Classifications
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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
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
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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
- H02J5/00—Circuit arrangements for transfer of electric power between ac networks and dc networks
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Abstract
The application provides an energy taking circuit and an energy taking system, wherein the energy taking circuit comprises a main electrode, a voltage transformation circuit and a rectifying circuit, the main electrode is arranged between a power transmission line and the ground, the projection of the main electrode on the ground and the projection of the power transmission line on the ground are at least partially overlapped, and the current in the power transmission line is alternating current; the first input end of the transformation circuit is electrically connected with the power transmission line; the second input end of the transformation circuit is electrically connected with the main electrode; the first output end of the transformation circuit is electrically connected with the first alternating current input end of the rectification circuit; the second output end of the transformation circuit is electrically connected with the second alternating current input end of the rectification circuit; the positive direct current output end of the rectifying circuit is electrically connected with the positive electrode of the load; and the negative DC output end of the rectifying circuit is electrically connected with the negative electrode of the load. The above method is employed to provide sufficient power to the load.
Description
Technical Field
The application relates to the technical field of circuits, in particular to an energy taking circuit and an energy taking system.
Background
In the prior art, the energy taking mode of the power transmission line is mainly CT energy taking (a method for obtaining electric energy by utilizing an electromagnetic induction principle).
The inventor finds in the study that when the power transmission line is used for taking energy based on electromagnetic induction to supply power to a load, the magnetic field around the power transmission line changes along with the current change of the line, so that the induction voltage generated by the energy taking coil is influenced, and the power supplied to the load is influenced, namely, the larger the current intensity in the power transmission line is, the larger the magnetic induction intensity around the power transmission line is, and the larger the power supplied to the load is, otherwise, the smaller the current intensity in the power transmission line is, the smaller the magnetic induction intensity around the power transmission line is, and the smaller the power supplied to the load is, namely, the power supplied to the load by the power transmission line is dependent on the current intensity in the power transmission line when the energy is taken based on the electromagnetic induction; for a high-voltage transmission line with a smaller voltage level, the constantly-changed line current can bring unstable negative influence to energy taking, and in the process of changing the line current, when the current intensity of the transmission line is too small, the power obtained by utilizing the electromagnetic induction principle is too small, so that enough power cannot be provided for a load.
Disclosure of Invention
Accordingly, the present invention is directed to an energy-extracting circuit and system for providing sufficient power to a load.
In a first aspect, an embodiment of the present application provides an energy capturing circuit, where the energy capturing circuit includes a main electrode, a voltage transformation circuit and a rectifying circuit, the main electrode is disposed between a power transmission line and the ground, a projection of the main electrode on the ground and a projection of the power transmission line on the ground are at least partially overlapped, and current in the power transmission line is an alternating current;
the first input end of the transformation circuit is electrically connected with the power transmission line;
the second input end of the transformation circuit is electrically connected with the main electrode;
the first output end of the transformation circuit is electrically connected with the first alternating current input end of the rectification circuit;
The second output end of the transformation circuit is electrically connected with the second alternating current input end of the rectification circuit;
the positive direct current output end of the rectifying circuit is electrically connected with the positive electrode of the load;
and the negative DC output end of the rectifying circuit is electrically connected with the negative electrode of the load.
Optionally, the rectifying circuit includes a first diode, a second diode, a third diode, and a fourth diode;
The negative electrode of the first diode is respectively and electrically connected with the first output end of the voltage transformation circuit and the positive electrode of the second diode;
the cathode of the second diode is electrically connected with the anode of the load and the cathode of the fourth diode respectively;
The anode of the third diode is electrically connected with the anode of the first diode and the cathode of the load respectively;
the anode of the fourth diode is electrically connected with the cathode of the third diode and the second output end of the voltage transformation circuit respectively.
Optionally, the energy-taking circuit further comprises a secondary electrode, the secondary electrode is arranged between the main electrode and the power transmission line, and the projection of the secondary electrode on the ground and the projection of the main electrode on the ground are at least partially overlapped;
The first end of the auxiliary electrode is electrically connected with the power transmission line;
the second end of the auxiliary electrode is electrically connected with the first input end of the voltage transformation circuit.
Optionally, the voltage transformation circuit comprises a step-down transformer;
a first end of a primary side of the step-down transformer is electrically connected with the auxiliary electrode;
A second end of the primary side of the step-down transformer is electrically connected with the main electrode;
A first end of a secondary side of the step-down transformer is electrically connected with a first alternating current input end of the rectifying circuit;
the second end of the secondary side of the step-down transformer is electrically connected with the second alternating current input end of the rectifying circuit.
Optionally, the energy-taking circuit further comprises a compensation capacitor;
a first end of the compensation capacitor is electrically connected with a first end of a primary side of the step-down transformer;
The second end of the compensation capacitor is electrically connected with the second end of the primary side of the step-down transformer.
Optionally, a distance between the main electrode and the power transmission line is smaller than a distance between the main electrode and the ground.
Optionally, the main electrode is a metal polar plate.
Optionally, the auxiliary electrode is a metal polar plate.
Optionally, the capacitance value of the compensation capacitor satisfies:
wherein C 0 is the capacitance value of the compensation capacitor, ω is the angular frequency of the voltage of the power transmission line, L m is the excitation inductance of the step-down transformer, and C i1 is the capacitance value of the induced capacitance between the auxiliary electrode and the main electrode.
In a second aspect, an embodiment of the present application provides an energy capturing system, including an energy capturing circuit according to any one of the first aspects.
Based on the technical scheme, the energy taking circuit and the energy taking system provided by the embodiment of the invention convert electric energy in the power transmission line by utilizing the step-down transformer and the rectifying circuit and then supply power to the load so as to provide enough power for the load.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an energy-extracting circuit according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of another power-taking circuit according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram of another power-taking circuit according to a first embodiment of the present invention;
FIG. 4 is a schematic diagram of another power-taking circuit according to a first embodiment of the present invention;
FIG. 5 is a schematic diagram of another power-taking circuit according to a first embodiment of the present invention;
FIG. 6 shows a schematic diagram of the induced capacitance in FIG. 5;
fig. 7 shows an equivalent circuit diagram of fig. 5.
Reference numerals illustrate: 1-a main electrode; a 2-voltage transformation circuit; a 3-rectification circuit; 4-a power transmission line; 5-earth; 6-loading; 7-a first diode; 8-a second diode; 9-a third diode; 10-fourth diode; 11-a sub-electrode; 12-step-down transformers; 13-compensation capacitance.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
Example 1
In order to facilitate understanding of the present application, the following describes a detailed description of the first embodiment of the present application with reference to the schematic diagram of the configuration of the power-taking circuit provided in the first embodiment of the present application shown in fig. 1.
Referring to fig. 1, fig. 1 shows a schematic structural diagram of an energy-taking circuit according to a first embodiment of the present invention, where the energy-taking circuit includes a main electrode 1, a transformation circuit 2, and a rectification circuit 3, the main electrode 1 is disposed between a power transmission line 4 and a ground 5, a projection of the main electrode 1 on the ground and a projection of the power transmission line 4 on the ground at least partially overlap, and a current in the power transmission line is an alternating current.
The first input terminal of the transformation circuit 2 is electrically connected to the power transmission line 4.
A second input terminal of the voltage transformation circuit 2 is electrically connected to the main electrode 1.
The first output terminal of the transformation circuit 2 is electrically connected to a first ac input terminal of the rectifying circuit 3.
A second output terminal of the transformation circuit 2 is electrically connected to a second ac input terminal of the rectifying circuit 3.
The positive dc output of the rectifying circuit 3 is electrically connected to the positive pole of the load 6.
The negative dc output of the rectifying circuit 3 is electrically connected to the negative of the load 6.
Specifically, the main electrode is an electrode for energy taking, which may also be called an energy taking electrode, and may be of a flat plate type structure.
The voltage transformation circuit has four ends, namely, two alternating current input ends, an anode direct current output end and a cathode direct current output end, and because the alternating current can be input without dividing the anode and the cathode, the alternating current input end is also not divided into the anode and the cathode, and the direct current is different from the anode and the cathode, so the anode direct current output end and the cathode direct current output end of the voltage transformation circuit are respectively connected with the anode and the cathode of a load correspondingly.
The rectifier circuit is a circuit capable of converting alternating current of which direction and magnitude are changed into direct current by using a device having unidirectional conductive characteristics.
The transformation circuit is used for acquiring alternating current which meets the working power of a load from the power transmission line and then transmitting the alternating current to the rectification circuit; the rectified current is used to convert the alternating current into direct current that can operate the load, and then transmit the direct current to the load to power the load.
In a possible embodiment, referring to fig. 2, fig. 2 shows a schematic structural diagram of another energy-taking circuit according to an embodiment of the present invention, where the rectifying circuit 3 includes a first diode 7, a second diode 8, a third diode 9, and a fourth diode 10.
The cathode of the first diode 7 is electrically connected with the first output end of the voltage transformation circuit 2 and the anode of the second diode 8 respectively.
The cathode of the second diode 8 is electrically connected to the anode of the load 6 and the cathode of the fourth diode 10, respectively.
The positive electrode of the third diode 9 is electrically connected to the positive electrode of the first diode 7 and the negative electrode of the load 6, respectively.
The anode of the fourth diode 10 is electrically connected to the cathode of the third diode 9 and the second output terminal of the transformer circuit 2.
Specifically, the diode is an electronic device made of semiconductor materials, and has unidirectional conductivity, namely, when a forward voltage is applied to the anode of the diode, the diode is turned on, and when a reverse voltage is applied to the anode and the cathode, the diode is turned off, so that the on and off of the diode are equivalent to the on and off of the switch.
In a possible implementation manner, referring to fig. 3, fig. 3 shows a schematic structural diagram of another energy-taking circuit according to an embodiment of the present invention, where the energy-taking circuit further includes a secondary electrode 11, the secondary electrode 11 is disposed between the main electrode 1 and the power transmission line 4, and a projection of the secondary electrode 11 on the ground and a projection of the main electrode 1 on the ground at least partially overlap.
The first end of the sub-electrode 11 is electrically connected to the power transmission line 4.
A second end of the auxiliary electrode 11 is electrically connected to a first input end of the voltage transformation circuit 2.
Specifically, the auxiliary electrode is used for generating an induced capacitance with the main electrode, and can be of a flat plate type structure.
In one possible implementation, referring to fig. 4, fig. 4 shows a schematic structural diagram of another energy-taking circuit according to an embodiment of the present invention, where the voltage transformation circuit includes a step-down transformer 12.
A first end of the primary side of the step-down transformer 12 is electrically connected to the sub-electrode 11.
The second end of the primary side of the step-down transformer 12 is electrically connected to the main electrode 1.
A first end of the secondary side of the step-down transformer 12 is electrically connected to a first ac input of the rectifier circuit 3.
A second end of the secondary side of the step-down transformer 12 is electrically connected to a second ac input of the rectifier circuit 3.
Specifically, the rectifier circuit is connected in parallel to the secondary side of the step-down transformer, wherein the primary side refers to the input side of the voltage, the secondary side refers to the output side of the voltage converted by the transformer, the primary side is the low-voltage side for the step-up transformer, the secondary side is the high-voltage side for the step-down transformer, and the primary side is the high-voltage side, and the secondary side is the low-voltage side.
In a possible implementation manner, referring to fig. 5, fig. 5 shows a schematic structural diagram of another energy-taking circuit according to an embodiment of the present invention, where the energy-taking circuit further includes a compensation capacitor 13.
A first terminal of the compensation capacitor 13 is electrically connected to a first terminal of the primary side of the step-down transformer 12.
A second terminal of the compensation capacitor 13 is electrically connected to a second terminal of the primary side of the step-down transformer 12.
Specifically, the compensation capacitor is connected in parallel to the primary side of the step-down transformer.
Referring to fig. 6, fig. 6 shows a schematic diagram of the induced capacitance in fig. 5, where C i1 is the induced capacitance between the main electrode 1 and the sub-electrode 11, and C i2 is the induced capacitance between the main electrode 1 and the ground 5 (i.e., the capacitance to ground of the main conductor).
Referring to fig. 7, fig. 7 shows an equivalent circuit diagram of fig. 5, where C i1 in fig. 7 is an induced capacitance between the main electrode 1 and the auxiliary electrode 11, C i2 is an induced capacitance between the main electrode 1 and the ground 5 (i.e., a capacitance to ground of the main electrode), L m is an excitation inductance of the step-down transformer 12, R m is an excitation resistance of the step-down transformer 12, R L is an equivalent resistance of the load 6, 8N 2RL/π2 is an equivalent resistance of the load resistor R L and the rectifier circuit, C 0 is a compensation capacitance 13, N is a ratio of a first number of turns to a second number of turns, the first number of turns being a number of turns between a first end of the primary side of the step-down transformer 12 and a second end of the secondary side of the step-down transformer 12, and U is a phase voltage of the power transmission line 4.
The voltage U L across the load 6 is determined according to the following formula:
Wherein C i2 is (the capacitance value of) the induced capacitance between the main electrode 1 and the earth 5, L m is (the inductance value of) the excitation inductance of the step-down transformer 12, R m is (the resistance value of) the excitation resistance of the step-down transformer 12, R L is (the resistance value of) the equivalent resistance of the load 6, C 0 is (the capacitance value of) the compensation capacitance 13, N is the ratio of the first number of turns to the second number of turns, the first number of turns is the number of turns of the coil between the first end of the primary side of the step-down transformer 12 and the second end of the primary side of the step-down transformer 12, the second number of turns is the number of turns of the coil between the first end of the secondary side of the step-down transformer 12 and the second end of the secondary side of the step-down transformer 12, U is (the voltage value of the phase voltage of the step-down transformer 4), ω is the angular frequency of the voltage of the step-down transformer 4, and j is the imaginary number of turns.
The inductance value of the exciting inductance of the step-down transformer, the resistance value of the exciting resistance of the step-down transformer and the capacitance value of the induced capacitance between the main electrode and the ground are measured by the bridge equipment.
The step-down transformer changes the amplification factor of load impedance by changing the turns ratio of the primary and secondary coils so as to achieve impedance matching, and the relation between the equivalent impedance value of the load and the turns ratio of the primary and secondary coils can be determined by the following formula:
Where R L is (the resistance of) the equivalent resistance of the load 6, N is the ratio of the first number of turns to the second number of turns, the first number of turns is the number of turns of the coil between the first end of the primary side of the step-down transformer 12 and the second end of the primary side of the step-down transformer 12, the second number of turns is the number of turns of the coil between the first end of the secondary side of the step-down transformer 12 and the second end of the secondary side of the step-down transformer 12, R m is (the resistance of) the excitation resistance of the step-down transformer 12, L m is (the inductance of) the excitation inductance of the step-down transformer 12, C 0 is (the capacitance of) the compensation capacitor 13, C i1 is (the capacitance of) the induced capacitance (parasitic capacitance) between the main electrode 1 and the auxiliary electrode 11, C i2 is (the capacitance of the ground capacitance) (i.e. the capacitance of the main electrode), ω is the angular frequency of the voltage of the power transmission line 4, ω = 2 f, f is the voltage frequency of the power transmission line.
The capacitance value C i2 of the induced capacitance between the main electrode 1 and the earth 5 (i.e. the capacitance to ground of the main electrode) is calculated by the relevant simulation analysis software, including COMSOL (a multi-physical field simulation software) or ANSYS (a large general purpose finite element analysis software).
In one possible embodiment, the distance between the main electrode and the transmission line is smaller than the distance between the main electrode and the ground.
In one possible embodiment, the main electrode is a metal plate.
In one possible embodiment, the secondary electrode is a metal plate.
In one possible embodiment, the capacitance value of the compensation capacitor satisfies:
wherein C 0 is the capacitance value of the compensation capacitor, ω is the angular frequency of the voltage of the power transmission line, L m is the excitation inductance of the step-down transformer, and C i1 is the capacitance value of the induced capacitance between the auxiliary electrode and the main electrode.
Specifically, the capacitance value of the compensation capacitor 13 satisfiesThat is, the compensation capacitor 13 and the exciting inductance of the step-down transformer 12 can achieve parallel resonance, so that the power loss of the step-down transformer 12 is reduced, and the working power of the load 6 is improved.
When the energy taking circuit is used for energy taking, the method comprises the following steps:
Step one: the main electrode (an electrode for energy taking, hereinafter collectively referred to as an energy taking electrode) is connected with a power transmission line through a step-down transformer, a compensation capacitor is connected in parallel with the primary side of the step-down transformer, the secondary side of the step-down transformer is connected with a rectifying circuit and a load, and the energy taking electrode can be fixed on one side close to the power transmission line by means of a rigid structure of the energy taking circuit, so that the energy taking electrode is used for supplying energy to the load by utilizing the generated capacitance to ground and equivalent impedance series voltage division of the energy taking circuit. When the voltage of the power transmission line is 35kV or below, the overhead bare conductor and the overhead cable are mainly used for power transmission, so that the outgoing line on one side of the primary side of the transformer is required to be connected with the power transmission line, and the overhead bare conductor is directly connected; for overhead cables, a metal high-voltage electrode can be arranged on the cable insulating sheath, the cable conductor and the high-voltage electrode are equipotential through a metal probe, and then the electrode is connected with an outgoing line.
Step two: by changing the compensation capacitance, the parallel resonant circuit is formed by the induced capacitance (hereinafter collectively called parasitic capacitance) between the energy-taking electrode and the power transmission line (or the auxiliary electrode), the compensation capacitance and the equivalent excitation inductance of the step-down transformer, wherein the compensation capacitance meets the following requirementsWherein C 0 is the capacitance value of the compensation capacitor, ω is the angular frequency of the voltage of the power transmission line, L m is the excitation inductance of the step-down transformer, C i1 is the capacitance value of the induced capacitance between the auxiliary electrode and the main electrode, C i1、Lm can be measured by bridge-type equipment, ω=2pi f, f is the voltage frequency of the power transmission line, and when f is 50Hz, the approximation value of ω is 314.159.
Step three: the amplified load impedance is matched by changing the turns ratio of the primary side and the secondary side of the step-down transformer, and in order to meet the impedance matching requirement, the equivalent load needs to meet:
Where R L is (the resistance of) the equivalent resistance of the load 6, N is the ratio of the first number of turns, the number of turns being the coil between the first end of the primary side of the step-down transformer 12 and the second end of the primary side of the step-down transformer 12, the second number of turns being the number of turns between the first end of the secondary side of the step-down transformer 12 and the second end of the secondary side of the step-down transformer 12, R m is (the resistance of) the excitation resistance of the step-down transformer 12, L m is (the inductance of) the excitation inductance of the step-down transformer 12, C 0 is (the capacitance value of) the compensation capacitor 13, C i1 is (the capacitance value of) the induced capacitance (parasitic capacitance) between the main electrode 1 and the auxiliary electrode 11, C i1、Lm、Rm can be measured by a bridge type device, C i2 is (the capacitance value of) the induced capacitance (i.e. the capacitance to ground) between the main electrode 1 and the ground 5, ω is the angular frequency of the voltage of the power transmission line 4, ω=2pi f is the voltage frequency of the power transmission line; if the load voltage converted by the ratio N of the first turns to the second turns in practical application cannot meet the load requirement, a buck circuit (a buck conversion circuit) or a boost circuit (a boost conversion circuit) can be added between the secondary side of the buck transformer and the load to regulate the voltage.
After the relevant parameters of the energy-taking circuit are determined, the voltage U L at the two ends of the load side is calculated according to the following formula:
Wherein C i2 is (the capacitance value of) the induced capacitance between the main electrode 1 and the earth 5, L m is (the inductance value of) the excitation inductance of the step-down transformer 12, R m is (the resistance value of) the excitation resistance of the step-down transformer 12, R L is (the resistance value of) the equivalent resistance of the load 6, C 0 is (the capacitance value of) the compensation capacitance 13, N is the ratio of the first number of turns to the second number of turns, the first number of turns is the number of turns of the coil between the first end of the primary side of the step-down transformer 12 and the second end of the primary side of the step-down transformer 12, the second number of turns is the number of turns of the coil between the first end of the secondary side of the step-down transformer 12 and the second end of the secondary side of the step-down transformer 12, U is (the voltage value of the phase voltage of the step-down transformer 4), ω is the angular frequency of the voltage of the step-down transformer 4, and j is the imaginary number of turns.
The power P L obtained on the load side is calculated according to the following formula:
Wherein U L is the voltage value at two ends of the load side, and R L is the equivalent resistance value of the load.
Example two
The embodiment of the application also provides an energy taking system, and the load working system comprises the energy taking circuit in any embodiment.
The energy taking system provided by the embodiment of the application is used for providing enough power for a load.
The circuit provided by the embodiment of the present invention has the same implementation principle and technical effects as those of the foregoing method embodiment, and for the sake of brevity, reference may be made to the corresponding content in the foregoing method embodiment where the circuit embodiment is not mentioned. It will be clear to those skilled in the art that, for convenience and brevity, the specific operation of the system, circuit and unit described above may refer to the corresponding process in the above method embodiment, which is not described in detail herein.
In the embodiments provided herein, it should be understood that the disclosed circuits and methods may be implemented in other ways. The above-described circuit embodiments are merely illustrative, for example, the division of the units is merely a logical function division, and there may be other manners of division in actual implementation, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, circuit or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments provided in the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
It should be noted that: like reference numerals and letters in the following figures denote like items, and thus once an item is defined in one figure, no further definition or explanation of it is required in the following figures, and furthermore, the terms "first," "second," "third," etc. are used merely to distinguish one description from another and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above examples are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, but it should be understood by those skilled in the art that the present invention is not limited thereto, and that the present invention is described in detail with reference to the foregoing examples: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the corresponding technical solutions. Are intended to be encompassed within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. The energy taking circuit is characterized by comprising a main electrode, a transformation circuit and a rectification circuit, wherein the main electrode is arranged between a power transmission line and the ground, the projection of the main electrode on the ground and the projection of the power transmission line on the ground are at least partially overlapped, and the current in the power transmission line is alternating current;
the first input end of the transformation circuit is electrically connected with the power transmission line;
the second input end of the transformation circuit is electrically connected with the main electrode;
the first output end of the transformation circuit is electrically connected with the first alternating current input end of the rectification circuit;
The second output end of the transformation circuit is electrically connected with the second alternating current input end of the rectification circuit;
the positive direct current output end of the rectifying circuit is electrically connected with the positive electrode of the load;
the negative DC output end of the rectifying circuit is electrically connected with the negative electrode of the load;
The energy-taking circuit further comprises an auxiliary electrode, the auxiliary electrode is arranged between the main electrode and the power transmission line, and the projection of the auxiliary electrode on the ground is at least partially overlapped with the projection of the main electrode on the ground;
The first end of the auxiliary electrode is electrically connected with the power transmission line;
The second end of the auxiliary electrode is electrically connected with the first input end of the voltage transformation circuit;
the voltage transformation circuit comprises a step-down transformer;
a first end of a primary side of the step-down transformer is electrically connected with the auxiliary electrode;
A second end of the primary side of the step-down transformer is electrically connected with the main electrode;
A first end of a secondary side of the step-down transformer is electrically connected with a first alternating current input end of the rectifying circuit;
The second end of the secondary side of the step-down transformer is electrically connected with the second alternating current input end of the rectifying circuit;
the energy taking circuit also comprises a compensation capacitor;
a first end of the compensation capacitor is electrically connected with a first end of a primary side of the step-down transformer;
The second end of the compensation capacitor is electrically connected with the second end of the primary side of the step-down transformer;
When the energy taking circuit is used for energy taking, the method comprises the following steps:
Step one: the main electrode is connected with the power transmission line through the step-down transformer, the compensation capacitor is connected in parallel with the primary side of the step-down transformer, the secondary side of the step-down transformer is connected with the rectifying circuit and the load, the energy-taking electrode is fixed on one side close to the power transmission line, and the energy-taking electrode and the equivalent impedance of the energy-taking circuit are connected in series and divided to supply energy to the load;
Step two: changing the compensation capacitance to enable the induced capacitance between the energy-taking electrode and the power transmission line, the compensation capacitance and the equivalent excitation inductance of the step-down transformer to form a parallel resonance circuit, wherein the compensation capacitance meets the following requirements Wherein, the method comprises the steps of, wherein,For the capacitance value of the compensation capacitor,For the angular frequency of the voltage of the transmission line,For the inductance value of the excitation inductance of the step-down transformer,For the capacitance value of the induced capacitance between the sub-electrode and the main electrode,，The voltage frequency of the power transmission line;
step three: the turns ratio of the primary side and the secondary side of the step-down transformer is changed, so that the amplified load impedance is matched, and the equivalent load meets the following conditions:
Wherein, Is the resistance value of the equivalent resistance of the load,The ratio of the first turns to the second turns is the number of turns of the coil between the first end of the primary side of the step-down transformer and the second end of the primary side of the step-down transformer, the second turns being the number of turns of the coil between the first end of the secondary side of the step-down transformer and the second end of the secondary side of the step-down transformer,To reduce the resistance of the exciting resistor of the transformer,To step down the inductance value of the excitation inductance of the transformer,，In order to compensate for the capacitance value of the capacitor,Is the capacitance value of the induced capacitance between the main electrode and the sub-electrode,The capacitance value of the induced capacitance between the main electrode and ground,For the angular frequency of the voltage of the transmission line,，The voltage frequency of the power transmission line;
After the relevant parameters of the energy-taking circuit are determined, the voltage at two ends of the load side Calculated according to the following formula:
Wherein, The capacitance value of the induced capacitance between the main electrode and ground,To step down the inductance value of the excitation inductance of the transformer,To reduce the resistance of the exciting resistor of the transformer,Is the resistance value of the equivalent resistance of the load,In order to compensate for the capacitance value of the capacitor,The ratio of the first turns to the second turns is the number of turns of the coil between the first end of the primary side of the step-down transformer and the second end of the primary side of the step-down transformer, the second turns being the number of turns of the coil between the first end of the secondary side of the step-down transformer and the second end of the secondary side of the step-down transformer,Is the voltage value of the phase voltage of the transmission line,For the angular frequency of the voltage of the transmission line,In imaginary units.
2. The energy extraction circuit of claim 1, wherein the rectifying circuit comprises a first diode, a second diode, a third diode, and a fourth diode;
The negative electrode of the first diode is respectively and electrically connected with the first output end of the voltage transformation circuit and the positive electrode of the second diode;
the cathode of the second diode is electrically connected with the anode of the load and the cathode of the fourth diode respectively;
The anode of the third diode is electrically connected with the anode of the first diode and the cathode of the load respectively;
the anode of the fourth diode is electrically connected with the cathode of the third diode and the second output end of the voltage transformation circuit respectively.
3. The energy extraction circuit of claim 1, wherein a spacing between the main electrode and the power transmission line is less than a spacing between the main electrode and the ground.
4. The energy extraction circuit of claim 1, wherein the main electrode is a metal plate.
5. The energy extraction circuit of claim 1, wherein the secondary electrode is a metal pad.
6. The energy extraction circuit of claim 1, wherein the capacitance value of the compensation capacitor satisfies:
；
Wherein, For the capacitance value of the compensation capacitor,For the angular frequency of the voltage of the transmission line,For the excitation inductance of the step-down transformer,Is a capacitance value of an induced capacitance between the sub-electrode and the main electrode.
7. An energy harvesting system comprising an energy harvesting circuit according to any one of claims 1-6.
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| CN102545688A (en) * | 2011-12-12 | 2012-07-04 | 中国电力科学研究院 | Power pulse generation device, drive method, and high-voltage wire electricity getting method |
| CN106549589A (en) * | 2016-12-30 | 2017-03-29 | 广东电网有限责任公司清远供电局 | The electricity getting device of overhead transmission line |
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| CN209516946U (en) * | 2018-12-29 | 2019-10-18 | 惠州三华工业有限公司 | Positive DC supercircuit |
| CN110739750A (en) * | 2019-10-23 | 2020-01-31 | 南京农业大学 | High-voltage power transmission self-energy-taking device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102545688A (en) * | 2011-12-12 | 2012-07-04 | 中国电力科学研究院 | Power pulse generation device, drive method, and high-voltage wire electricity getting method |
| CN106549589A (en) * | 2016-12-30 | 2017-03-29 | 广东电网有限责任公司清远供电局 | The electricity getting device of overhead transmission line |
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