CN214380324U - Double-frequency double-load wireless power transmission system with communication function - Google Patents
Double-frequency double-load wireless power transmission system with communication function Download PDFInfo
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- CN214380324U CN214380324U CN202023032944.7U CN202023032944U CN214380324U CN 214380324 U CN214380324 U CN 214380324U CN 202023032944 U CN202023032944 U CN 202023032944U CN 214380324 U CN214380324 U CN 214380324U
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Abstract
The utility model discloses a two-frenquency dual load wireless power transmission system of band-pass communication function, including high-power wireless power transmission system and miniwatt wireless power transmission system, high-power wireless power transmission system's resonant frequency and miniwatt wireless power transmission system's resonant frequency are different, and high-power wireless power transmission system adopts DD type coil, and miniwatt wireless power transmission system adopts circular coil. The primary coil and the secondary coil of the high-power wireless electric energy transmission system adopt the DD coil, and the DD coil has a coupling coefficient and transmission power which are larger than those of a circular coil under the requirement of the same space area, is suitable for high-power transmission, and is beneficial to realizing larger power transmission in a limited space. The primary coil and the secondary coil of the low-power wireless power transmission system adopt circular coils, and the circular coils have better horizontal anti-deviation capability than DD coils, so that the transmission and the stability of signals are facilitated, and the signal transmission error rate is lower.
Description
Technical Field
The utility model relates to a double-frenquency dual load wireless power transmission system of band-pass communication function belongs to wireless power transmission technical field.
Background
The Magnetic Coupling Resonant mode is named as Magnetic resonance Coupling, MRC for short, the Wireless Power Transfer is named as Wireless Power Transfer, WPT for short, and the Magnetic Coupling Resonant mode Wireless Power Transfer technology is a new Wireless Power Transfer technology and is provided by the teaching of Marin Soljaci of MIT, Massachusetts institute of technology, 2007. The technology has the characteristics of long transmission distance, high efficiency and small influence on human bodies and surrounding environments, so the technology is widely concerned by related research institutions and scholars.
A core unit of the MRC-WPT system is a pair of transmitting and receiving resonant coils, one of the necessary conditions for realizing efficient electric energy transmission is that the transmitting and receiving resonant coils have the same inherent resonant frequency, and the working frequency of the system is the inherent resonant frequency. In addition to the energy transmission system, the wireless power transmission system is very necessary for the transmission of signals between the transceiver coil and the control circuit and the research on power supply of the control circuit. In an actual power supply system, a plurality of loads may need to be powered simultaneously, for example, if a battery pack needs to be charged during charging of an electric vehicle, a BMS system needs to be powered, foreign matter detection and discrete dynamic charging coil detection of a wireless charging system are particularly important for researching a wireless power transmission system for simultaneously powering multiple loads.
A great deal of research has been done by foreign scholars on the research of multi-load wireless power supply systems. Currently, there are 2 research methods for implementing a wireless power transmission system for multi-load power supply: 1) the single-transmitting multi-receiving structure is characterized in that a coil coupling mechanism adopts a single transmitting coil and a plurality of receiving coils; 2) the multi-load wireless electric energy transmission system adopts a multi-resonant frequency circuit structure to realize multi-power supply and multi-load power supply. The prior art has the problems that synchronous communication cannot be realized, and Bluetooth and wifi communication are easily interfered in a wireless high-power transmission environment.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that overcome prior art's defect, provide a take communication function's dual-frenquency dual load wireless power transmission system, designed a dual-frenquency magnetic coupling resonant mode wireless power transmission system and a novel coil structure of eclipsed form DD and circular combination, this coil coupled system has the resonant frequency of two kinds of differences. Therefore, the device can realize the function of independently synchronously supplying power for double loads. Meanwhile, the device is additionally provided with a signal sending module, a signal receiving module and a signal analyzing module on a low-power transmission system, and synchronously transmits signals by means of the low-power wireless electric energy transmission system, so that the device has a synchronous communication function, solves the problem that Bluetooth and wifi communication are easily interfered under a wireless high-power transmission environment, and increases the functionality of the system.
In order to achieve the above object, the utility model provides a two-frequency double-load wireless power transmission system of area communication function, including high-power wireless power transmission system and miniwatt wireless power transmission system, high-power wireless power transmission system's resonant frequency is different with miniwatt wireless power transmission system's resonant frequency, and high-power wireless power transmission system adopts DD type coil, and miniwatt wireless power transmission system adopts circular coil.
Preferentially, the transmitting end of the high-power wireless power transmission system comprises a direct-current signal UDC1, an input resistor RD1, a first bridge inverter circuit, a primary side parasitic resistor R1, a primary side resonant capacitor C2, a primary side transmitting coil L1 and an energy storage capacitor C1, wherein the direct-current signal UDC1 is connected with the energy storage capacitor C1 in parallel, the direct-current signal UDC1 is connected with the input resistor RD1 in parallel, the direct-current signal UDC1 is connected with the first bridge inverter circuit in parallel, and the primary side parasitic resistor R1, the primary side resonant capacitor C2 and the primary side transmitting coil L1 are connected with each other in series and then are respectively connected to the connecting points of the first bridge inverter circuit to form a loop; the first bridge inverter circuit comprises four MOSFETs.
Preferably, the receiving end of the high-power wireless power transmission system comprises a secondary side receiving coil L3, a secondary side resonant capacitor C3, a secondary side parasitic resistor R3, a first rectifying circuit, an equivalent load resistor RL1 and an energy storage capacitor C4,
the secondary side receiving coil L3, the secondary side resonant capacitor C3 and the secondary side parasitic resistor R3 are connected in series with one another and then are respectively connected to the connection point of the first rectifying circuit to form a loop, the first rectifying circuit is connected with the energy storage capacitor C4 in parallel, and the first rectifying circuit is connected with the equivalent load resistor RL1 in parallel; the first rectifying circuit includes four first diodes.
Preferably, the transmitting terminal of the low-power wireless power transmission system comprises a direct current signal UDC2, a signal transmitting source Uign, a second bridge inverter circuit, a primary side parasitic resistor R2, a primary side resonant capacitor C6, a primary side transmitting coil L2 and an energy storage capacitor C5,
the direct-current signal UDC2 is connected in series with a signal emission source Usign and then connected in parallel with an energy storage capacitor C5, an energy storage capacitor C5 is connected in parallel with an input resistor RD2, the energy storage capacitor C5 is connected in parallel with a second bridge inverter circuit, a primary side parasitic resistor R2, a primary side resonant capacitor C6 and a primary side emission coil L2 are connected in series with each other and then respectively connected to the connection points of the second bridge inverter circuit to form a loop; the second bridge type inverter circuit comprises four metal-oxide-semiconductor field effect transistors (MOSFETs).
Preferentially, the receiving end of the low-power wireless power transmission system comprises a secondary receiving coil L4, a secondary resonant capacitor C7, a secondary parasitic resistor R4, a second rectifying circuit, an equivalent load resistor RL2 and an energy storage capacitor C8, wherein the second rectifying circuit comprises four second diodes, and the secondary receiving coil L4, the secondary resonant capacitor C7 and the secondary parasitic resistor R4 are connected in series and then are respectively connected to the connection points of the second rectifying circuit to form a loop; the second rectifying circuit is connected with the energy storage capacitor C8 in parallel, and the second rectifying circuit is connected with the equivalent load RL1 in parallel.
Preferably, the primary transmission coil L1 and the secondary reception coil L3 for transmitting high-power radio energy employ DD-type coils.
Preferably, the primary side transmission coil L2 and the secondary side reception coil L4 for transmitting small power radio energy employ circular coils.
Preferably, the primary side transmitting coil L1 and the secondary side receiving coil L3 are both 120mm in length and 100mm in width.
Preferably, the coil radii of the primary side transmitting coil L2 and the secondary side receiving coil L4 are both 80 mm.
Preferably, the resonance frequency of the high power wireless power transmission system is 85KHz, and the resonance frequency of the low power wireless power transmission system is 30 KHz.
The utility model discloses the beneficial effect who reaches:
the device provides a double-frequency double-load wireless power transmission system with a communication function, designs a double-frequency magnetic coupling resonant wireless power transmission system and a novel overlapped DD and circular combined coil structure, and the coil coupling system has two different resonant frequencies. Therefore, the device can realize the function of independently synchronously supplying power for double loads. Meanwhile, the device is additionally provided with a signal sending module, a signal receiving module and a signal analyzing module on a low-power transmission system, and synchronously transmits signals by means of the low-power wireless electric energy transmission system, so that the device has a synchronous communication function, solves the problem that Bluetooth and wifi communication are easily interfered under a wireless high-power transmission environment, and increases the functionality of the system.
The primary coil and the secondary coil of the high-power wireless electric energy transmission system adopt the DD coil, and the DD coil has a coupling coefficient and transmission power which are larger than those of a circular coil under the requirement of the same space area, is suitable for high-power transmission, and is beneficial to realizing larger power transmission in a limited space. The primary coil and the secondary coil of the low-power wireless power transmission system adopt circular coils, and the circular coils have better horizontal anti-deviation capability than DD coils, so that the transmission and the stability of signals are facilitated, and the signal transmission error rate is lower.
The device realizes a double-frequency double-load wireless power transmission system with a communication function, and aims at double superposed coils, a large coil adopts a DD (direct digital) coil, and a small coil adopts a circular coil. When wireless power supply is carried out, the large coil and the small coil respectively work under different resonant frequencies, two sets of power supply systems are used for finally supplying power to the two loads, the simultaneous power supply of the large load and the small load is realized, and the mutual coupling between the coils is reduced as much as possible due to the design of the double-frequency coils of different types. On the basis of the double-frequency double-load wireless power transmission, the transmission function of signals on the small coil system is added, and the signal source is superposed on the direct current side of the small coil system before inversion. The utility model discloses this kind of structure of use can realize can also synchronous communication when supplying power for the dual load, has increased the functionality, has reduced the interference that receives among the ordinary communication process.
Drawings
FIG. 1 is a schematic diagram of a dual-band wireless power transmission system of the present apparatus;
FIG. 2 is a topological structure diagram of a dual-band wireless power transmission system with communication function of the device;
FIG. 3 is a schematic diagram of an equivalent circuit model of a system of a low-power wireless power transmission part of the device;
fig. 4 is a schematic block diagram of the present apparatus.
Detailed Description
The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
It should be noted that, if there is a directional indication (such as up, down, left, right, front, and back) in the embodiment of the present invention, it is only used to explain the relative position relationship between the components, the motion situation, etc. in a certain specific posture, and if the specific posture is changed, the directional indication is changed accordingly.
In addition, if a description of "first", "second", etc. is referred to in the present invention, it is used for descriptive purposes only and not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The direct current signal UDC1 is changed into a high-frequency alternating current signal through a first bridge inverter circuit, the high-frequency alternating current signal is changed into a space magnetic field signal through a resonance network formed by a primary side parasitic resistor R1, a primary side resonance capacitor C1 and a primary side transmitting coil L1, the space magnetic field signal is changed into a high-frequency alternating current signal again through a secondary side resonance network formed by a secondary side receiving coil L3, a secondary side resonance capacitor C3 and a secondary side parasitic resistor R3, the high-frequency alternating current signal is changed into a direct current signal through a first rectification circuit formed by four diodes, the direct current signal passes through an energy storage capacitor and finally reaches two ends of an equivalent load RL1, and the process of high-power wireless power transmission is achieved.
The high-low level signal Usign is the high-low level of the output signal through the I/O port, the high-low level signal is obtained through a signal isolation amplifying circuit, Usign is further superposed on UDC2, the high-frequency alternating current signal with the amplitude changing according to the signal rule is changed through a second inverter circuit, the high-frequency alternating current signal is converted into space magnetic field energy through a primary small circular transmitting coil, a secondary small circular coil receives the magnetic field energy and is converted into a high-frequency alternating current signal through a resonance unit, an envelope curve of the high-frequency alternating current signal is read through a detection circuit, transmitted signal information is carried on the envelope curve, the envelope curve is sampled through a sampling circuit, and finally required communication information is obtained through signal analysis.
The primary coil and the secondary coil of the high-power wireless electric energy transmission system adopt the DD coil, and the DD coil has a coupling coefficient and transmission power which are larger than those of a circular coil under the requirement of the same space area, is suitable for high-power transmission, and is beneficial to realizing larger power transmission in a limited space. The primary coil and the secondary coil of the low-power wireless power transmission system adopt circular coils, and the circular coils have better horizontal anti-deviation capability than DD coils, so that the transmission and the stability of signals are facilitated, and the signal transmission error rate is lower.
The direct-current signal UDC1, the input resistor RD1, the first bridge inverter circuit, the primary side parasitic resistor R1, the primary side resonant capacitor C2, the primary side transmitting coil L1, the energy storage capacitor C1, the secondary side receiving coil L3, the secondary side resonant capacitor C3, the secondary side parasitic resistor R3, the first rectifier circuit, the equivalent load resistor RL1, the energy storage capacitor C4, the direct-current signal UDC2, the signal emitting source Usign, the second bridge inverter circuit, the parasitic primary side resistor R2, the primary side resonant capacitor C6, the primary side transmitting coil L2, the energy storage capacitor C5, the secondary side receiving coil L4, the secondary side resonant capacitor C7, the secondary side parasitic resistor R4, the second rectifier circuit, the equivalent load resistor RL2, the energy storage capacitor C8, and the detector circuit are available in the prior art, and the types of the above components can be selected by a person skilled in the art according to actual needs, and the embodiments are not exemplified one by one.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be considered as the protection scope of the present invention.
Claims (10)
1. A double-frequency double-load wireless power transmission system with a communication function is characterized by comprising a high-power wireless power transmission system and a low-power wireless power transmission system, wherein the resonant frequency of the high-power wireless power transmission system is different from that of the low-power wireless power transmission system, the high-power wireless power transmission system adopts a DD (direct digital) coil, and the low-power wireless power transmission system adopts a circular coil.
2. The dual-frequency dual-load wireless power transmission system with the communication function as claimed in claim 1, wherein the transmitting terminal of the high-power wireless power transmission system comprises a direct current signal UDC1, an input resistor RD1, a first bridge inverter circuit, a primary side parasitic resistor R1, a primary side resonant capacitor C2, a primary side transmitting coil L1 and an energy storage capacitor C1, the direct current signal UDC1 is connected in parallel with the energy storage capacitor C1, the direct current signal UDC1 is connected in parallel with the input resistor RD1, the direct current signal UDC1 is connected in parallel with the first bridge inverter circuit, the primary side parasitic resistor R1, the primary side resonant capacitor C2 and the primary side transmitting coil L1 are connected in series with each other and then are respectively connected to the connection point of the first bridge inverter circuit to form a loop; the first bridge inverter circuit comprises four MOSFETs.
3. The dual-frequency dual-load wireless power transmission system with communication function as claimed in claim 1, wherein the receiving end of the high-power wireless power transmission system comprises a secondary side receiving coil L3, a secondary side resonant capacitor C3, a secondary side parasitic resistor R3, a first rectifying circuit, an equivalent load resistor RL1 and an energy storage capacitor C4,
the secondary side receiving coil L3, the secondary side resonant capacitor C3 and the secondary side parasitic resistor R3 are connected in series with one another and then are respectively connected to the connection point of the first rectifying circuit to form a loop, the first rectifying circuit is connected with the energy storage capacitor C4 in parallel, and the first rectifying circuit is connected with the equivalent load resistor RL1 in parallel; the first rectifying circuit includes four first diodes.
4. The dual-frequency dual-load wireless power transmission system with the communication function as claimed in claim 1, wherein the transmitting terminal of the low-power wireless power transmission system comprises a DC signal UDC2, a signal transmitting source Uign, a second bridge inverter circuit, a primary side parasitic resistor R2, a primary side resonant capacitor C6, a primary side transmitting coil L2 and an energy storage capacitor C5,
the direct-current signal UDC2 is connected in series with a signal emission source Usign and then connected in parallel with an energy storage capacitor C5, an energy storage capacitor C5 is connected in parallel with an input resistor RD2, the energy storage capacitor C5 is connected in parallel with a second bridge inverter circuit, a primary side parasitic resistor R2, a primary side resonant capacitor C6 and a primary side emission coil L2 are connected in series with each other and then respectively connected to the connection points of the second bridge inverter circuit to form a loop; the second bridge type inverter circuit comprises four metal-oxide-semiconductor field effect transistors (MOSFETs).
5. The dual-frequency dual-load wireless power transmission system with the communication function of claim 1, wherein a receiving end of the low-power wireless power transmission system comprises a secondary side receiving coil L4, a secondary side resonant capacitor C7, a secondary side parasitic resistor R4, a second rectifying circuit, an equivalent load resistor RL2 and an energy storage capacitor C8, the second rectifying circuit comprises four second diodes, and the secondary side receiving coil L4, the secondary side resonant capacitor C7 and the secondary side parasitic resistor R4 are connected in series and then connected to connection points of the second rectifying circuit respectively to form a loop; the second rectifying circuit is connected with the energy storage capacitor C8 in parallel, and the second rectifying circuit is connected with the equivalent load RL1 in parallel.
6. The dual-frequency dual-load wireless power transmission system with the communication function as claimed in claim 1, wherein the primary side transmitting coil L1 and the secondary side receiving coil L3 for transmitting high-power wireless power employ DD type coils.
7. The dual-frequency dual-load wireless power transmission system with communication function as claimed in claim 1, wherein the primary side transmitting coil L2 and the secondary side receiving coil L4 for transmitting low-power wireless power are circular coils.
8. The dual-frequency dual-load wireless power transmission system with the communication function as claimed in claim 6, wherein the primary side transmitting coil L1 and the secondary side receiving coil L3 both have a length of 120mm and a width of 100 mm.
9. The dual-frequency dual-load wireless power transmission system with the communication function as claimed in claim 7, wherein the coil radii of the primary side transmitting coil L2 and the secondary side receiving coil L4 are both 80 mm.
10. The dual-frequency dual-load wireless power transmission system with the communication function as claimed in claim 1, wherein the resonant frequency of the high-power wireless power transmission system is 85KHz, and the resonant frequency of the low-power wireless power transmission system is 30 KHz.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114142625A (en) * | 2021-11-30 | 2022-03-04 | 中南大学 | Three-dimensional wireless electric energy transmission system based on multi-frequency magnetic field space orientation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114142625A (en) * | 2021-11-30 | 2022-03-04 | 中南大学 | Three-dimensional wireless electric energy transmission system based on multi-frequency magnetic field space orientation |
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