CN114520546A - Wireless electric energy receiving device based on impedance compression - Google Patents
Wireless electric energy receiving device based on impedance compression Download PDFInfo
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- CN114520546A CN114520546A CN202210176476.5A CN202210176476A CN114520546A CN 114520546 A CN114520546 A CN 114520546A CN 202210176476 A CN202210176476 A CN 202210176476A CN 114520546 A CN114520546 A CN 114520546A
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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
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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Abstract
The invention provides a radio energy receiving device based on impedance compression, which comprises: a resonant network, a resistive compression network, a rectifying network and a load network, the resonant network being formed by a first resonant capacitor CsAnd a receiving coil LsThe resistance compression network is formed by a second resonant capacitor CrAnd a resonant inductor LrAre connected in parallel; the radio energy receiving device based on impedance compression utilizes the nonlinear impedance transformation characteristic of the resistance compression network, and solves the problems of insufficient output power and low transmission efficiency under a wide load range in the existing receiving scheme based on traditional bridge rectification.
Description
Technical Field
The invention relates to the field of wireless power transmission, in particular to a wireless power receiving device based on impedance compression.
Background
Wireless Power Transfer (WPT) technology refers to a power transfer mode that does not require a wired connection. The electromagnetic resonance type wireless power supply technology of the bulb is demonstrated for the first time by the institute of technology and technology of the Massachusetts in 2007, and the wireless power transmission technology is more and more paid attention to by people in recent years due to high reliability, flexibility and good safety performance. It has been used in many different fields, such as low power implantable medical devices, high power electric vehicles and devices in harsh environments.
Research on wireless power technology has mainly focused on enhancement of transmission power and improvement of transmission efficiency. The traditional receiving side equivalent alternating-current impedance based on bridge rectification linearly changes along with direct-current load, when the direct-current load changes greatly, the coupling efficiency of a primary coil and a secondary coil of the traditional receiving side equivalent alternating-current impedance based on bridge rectification is rapidly reduced, and when the direct-current load is small, the power transmitted to the secondary side is small.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a wireless energy receiving device based on impedance compression, which utilizes the nonlinear impedance transformation characteristic of a resistance compression network and solves the problems of insufficient output power and low transmission efficiency under a wide load range in the conventional receiving scheme based on the traditional bridge rectification.
The invention adopts the following technical scheme:
a wireless power receiving apparatus based on impedance compression, comprising: the resonant circuit is formed by connecting a first resonant capacitor and a receiving coil in series, and the resistance compression network is formed by connecting a second resonant capacitor and a resonant inductor in parallel; the rectifier network includes six rectifier diodes, the load network is parallelly connected by filter capacitance and direct current load and constitutes, specifically does:
One end of the receiving coil is connected with one end of the first resonant capacitor; the other end of the first resonance capacitor is connected with one end of the resonance inductor, and the other end of the first resonance capacitor is connected with one end of the second resonance capacitor; the other end of the second resonant capacitor is connected with the anode of the first rectifying tube and the cathode of the fourth rectifying tube; the other end of the resonant inductor is connected with the anode of the second rectifier tube and the cathode of the fifth rectifier tube; the cathode of the first rectifying tube is connected with the cathode of the second rectifying tube, the cathode of the third rectifying tube, one end of the filter capacitor and one end of the direct current load; the other end of the direct current load is connected with the other end of the filter capacitor, the anode of the fourth rectifying tube, the anode of the fifth rectifying tube and the anode of the sixth rectifying tube; and the cathode of the sixth rectifying tube is connected with the other end of the receiving coil.
Specifically, the values of the resonant inductance and the second resonant capacitance of the resistive compression network need to satisfy the following conditions:
where f is the resonant frequency of the resonant network, LrResonant inductance, CrIs a second resonant capacitor.
Specifically, when the current flows in the forward direction, the first forward current loop is a receiving coil, a first resonant capacitor, a second resonant capacitor, a first rectifier tube, a load network, a sixth rectifier tube and a receiving coil, and the second forward current loop is: the receiving coil, the first resonant capacitor, the resonant inductor, the second rectifier tube, the load network, the sixth rectifier tube and the receiving coil;
When the current reversely flows, the first reverse current loop is as follows: the rectifier comprises a receiving coil, a third rectifier tube, a load network, a fifth rectifier tube, a resonant inductor, a first resonant capacitor and a receiving coil;
the second reverse current loop is: the rectifier comprises a receiving coil, a third rectifier tube, a load network, a fourth rectifier tube, a second resonant capacitor, a first resonant capacitor and a receiving coil.
As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following advantages:
(1) the invention provides a radio energy receiving device based on impedance compression, which comprises: the resonant circuit is formed by connecting a first resonant capacitor and a receiving coil in series, and the resistance compression network is formed by connecting a second resonant capacitor and a resonant inductor in parallel; the radio energy receiving device based on impedance compression utilizes the nonlinear impedance transformation characteristic of the resistance compression network, and solves the problems of insufficient output power and low transmission efficiency under a wide load range in the existing receiving scheme based on traditional bridge rectification.
(2) The radio energy receiving device based on impedance compression provided by the invention has the advantages that the nonlinear impedance transformation characteristic of the resistance compression network can inhibit the equivalent alternating current impedance change range of the receiving end when the direct current load change range is larger, so that the coil coupling efficiency is improved. When the DC load is smaller, the equivalent AC load can be increased, so that the power transmitted from the primary side to the receiving side can be increased
(3) The radio energy receiving device based on the impedance compression does not introduce extra imaginary part impedance in the whole impedance conversion process, and does not change the transmission characteristic of a front end circuit.
Drawings
Fig. 1 is a schematic diagram of a wireless power transmission system based on the wireless power receiving device;
fig. 2 is a current mode diagram for the wireless power transmission and reception apparatus according to the present invention, wherein (a) is a current mode diagram when a current flows in a forward direction, and (b) is a current mode diagram when a current flows in a reverse direction;
FIG. 3 is an equivalent circuit diagram of the RCN network of the present invention;
FIG. 4 is an equivalent impedance curve of the RCN network of the present invention under given load range and parameter conditions;
fig. 5 is an output power curve of the RCN network of the present invention under given load ranges and parameters.
The invention is described in further detail below with reference to the figures and specific examples.
Detailed Description
The radio energy receiving device based on impedance compression provided by the invention utilizes the nonlinear impedance transformation characteristic of a resistance compression network, and solves the problems of insufficient output power and low transmission efficiency under a wide load range in the existing receiving scheme based on traditional bridge rectification.
The technical solution in 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; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise specifically stated or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are used in a broad sense, and for example, "connected" may be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, and a communication between two elements.
Referring to fig. 1, an embodiment includes a wireless power transmission device including a wireless power transmitting end and a wireless power receiving end. The transmitting terminal adopts a universal series resonant network and is powered by a power supply VdcInput filter capacitor CinTwo switching tubes S forming a half-bridge inverter1And S2Transmitting coil LpAnd a resonant capacitor CpAnd (4) forming. The receiving apparatus includes:
a resonant tank, a resistive compression network, a rectifying network and a load network, the resonant tank being formed by a first resonanceVibration capacitor CsAnd a receiving coil L sFormed by a second resonant capacitor CrAnd a resonant inductor LrAre connected in parallel; the rectifier network includes six rectifier diodes, the load network is parallelly connected by filter capacitance and direct current load and constitutes, specifically does:
the receiving coil LsAnd a first resonant capacitor CsOne end of the two ends are connected;
the first resonant capacitor CsAnother end of (1) and a resonant inductor LrAnd a second resonant capacitor CrOne end of the two ends are connected;
the second resonant capacitor CrThe other end and the first rectifying tube d1Anode of and a fourth rectifying tube d4The cathodes of the two electrodes are connected;
the resonance inductor LrThe other end and a second rectifying tube d2Anode of and a fifth rectifier tube d5The cathodes of the two electrodes are connected;
the first rectifying tube d1Cathode and second rectifying tube d2Cathode and third rectifying tube d3Cathode and filter capacitor CoAnd the direct current load RLOne end of the two ends are connected;
the DC load RLAnother terminal of (1) and a filter capacitor CoIs connected at the other end thereof, a fourth rectifying tube d4Anode of and a fifth rectifier tube d5Anode and sixth rectifying tube d6The anodes of the anode groups are connected;
sixth rectifying tube d6Cathode and receiving coil L ofsThe other ends of the two are connected;
other equivalent methods exist for the device: c sAnd LsExchange positions, LrAnd CrExchange positions, C0And RLThe interchange of the positions does not affect the normal implementation of the device.
Resistance compression network in selecting inductance LrAnd a capacitor CrThe following conditions should be satisfied for the values of (1):
wherein f is the inductance LsAnd a capacitor CsThe resonant frequency of the formed resonant network is as follows
Referring to fig. 2, the wireless power transmitting apparatus includes 2 modes in one period:
as shown in fig. 2(a), when the current on the receiving side flows in the forward direction, the first forward current loop is: l iss-Cs-Cr-d1-a load (C)o//RL)-d6-LsThe second forward current loop is: l iss-Cs-Lr-d2-a load (C)o//RL)-d6-Ls(ii) a When the current on the receiving side reversely flows as shown in fig. 2(b), the first reverse current loop is: l iss-d3-a load (C)o//RL)-d5-Lr-Cs-LsThe second reverse current loop is: l iss-d3-a load (C)o//RL)-d4-Cr-Cs-Ls。
See fig. 3 for equivalent circuit, equivalent ac input impedance R of its RCN networkeqRelation R with DC side impedanceLCan be expressed as
Wherein X is LrOr CrThe impedance value at the resonance frequency f.
Referring to the simulation results and the experimental results of fig. 4 and 5, the nonlinear impedance transformation characteristic of the resistive compression network can be verified, and when the variation range of the direct current load is large, the equivalent variation range of the alternating current impedance of the receiving end can be suppressed, so that the coil coupling efficiency is improved. When the dc load is small, the equivalent ac load thereof can be increased, so that the power transmitted from the primary side to the receiving side can be increased.
The invention provides a wireless electric energy receiving device based on impedance compression, which comprises: a resonant network, a resistive compression network, a rectifier network and a load network, the resonant network being formed by a first resonant capacitor CsAnd a receiving coil LsThe resistance compression network is formed by a second resonant capacitor CrAnd a resonant inductor LrAre connected in parallel; the radio energy receiving device based on impedance compression utilizes the nonlinear impedance transformation characteristic of the resistance compression network, and solves the problems of insufficient output power and low transmission efficiency under a wide load range in the existing receiving scheme based on traditional bridge rectification.
The radio energy receiving device based on impedance compression provided by the invention has the advantages that the nonlinear impedance transformation characteristic of the resistance compression network can inhibit the equivalent alternating current impedance change range of the receiving end when the direct current load change range is larger, so that the coil coupling efficiency is improved. When the DC load is small, the equivalent AC load can be increased, so that the power transmitted from the primary side to the receiving side can be increased
The radio energy receiving device based on the impedance compression does not introduce extra imaginary part impedance in the whole impedance conversion process, and does not change the transmission characteristic of a front end circuit.
The above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of the invention.
Claims (3)
1. A wireless power receiving device based on impedance compression, comprising: the resonant circuit comprises a resonant network, a resistance compression network, a rectification network and a load network, wherein the resonant network is formed by connecting a first resonant capacitor and a receiving coil in series, and the resistance compression network is formed by connecting a second resonant capacitor and a resonant inductor in parallel; rectifier network includes six rectifier diodes, load network is parallelly connected by filter capacitance and direct current load and constitutes, specifically does:
one end of the receiving coil is connected with one end of the first resonant capacitor; the other end of the first resonant capacitor is connected with one end of the resonant inductor, and the other end of the first resonant capacitor is connected with one end of the second resonant capacitor; the other end of the second resonant capacitor is connected with the anode of the first rectifying tube and the cathode of the fourth rectifying tube; the other end of the resonant inductor is connected with the anode of the second rectifier tube and the cathode of the fifth rectifier tube; the cathode of the first rectifying tube is connected with the cathode of the second rectifying tube, the cathode of the third rectifying tube, one end of the filter capacitor and one end of the direct current load; the other end of the direct current load is connected with the other end of the filter capacitor, the anode of the fourth rectifying tube, the anode of the fifth rectifying tube and the anode of the sixth rectifying tube; and the cathode of the sixth rectifying tube is connected with the other end of the receiving coil.
2. An impedance compression-based radio energy receiving device according to claim 1, wherein the values of the resonant inductance and the second resonant capacitance of the resistive compression network satisfy the following condition:
where f is the resonant frequency of the resonant network, LrResonant inductance, CrIs a second resonant capacitor.
3. The wireless power receiving device based on impedance compression as claimed in claim 1, wherein when the current flows in the forward direction, the first forward current loop is a receiving coil, a first resonant capacitor, a second resonant capacitor, a first rectifier, a load network, a sixth rectifier and a receiving coil, and the second forward current loop is: the receiving coil, the first resonant capacitor, the resonant inductor, the second rectifier tube, the load network, the sixth rectifier tube and the receiving coil;
when the current reversely flows, the first reverse current loop is as follows: the rectifier comprises a receiving coil, a third rectifier tube, a load network, a fifth rectifier tube, a resonant inductor, a first resonant capacitor and a receiving coil;
the second reverse current loop is: the rectifier comprises a receiving coil, a third rectifier tube, a load network, a fourth rectifier tube, a second resonant capacitor, a first resonant capacitor and a receiving coil.
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| CN202210176476.5A CN114520546A (en) | 2022-02-24 | 2022-02-24 | Wireless electric energy receiving device based on impedance compression |
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