CN115001161A - Single-power-supply multi-load wireless charging system - Google Patents
Single-power-supply multi-load wireless charging system Download PDFInfo
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- CN115001161A CN115001161A CN202210704272.4A CN202210704272A CN115001161A CN 115001161 A CN115001161 A CN 115001161A CN 202210704272 A CN202210704272 A CN 202210704272A CN 115001161 A CN115001161 A CN 115001161A
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- 238000010168 coupling process Methods 0.000 claims abstract description 20
- 238000005859 coupling reaction Methods 0.000 claims abstract description 20
- 230000007246 mechanism Effects 0.000 claims abstract description 13
- 239000003990 capacitor Substances 0.000 claims description 71
- 230000005540 biological transmission Effects 0.000 abstract description 7
- 230000001939 inductive effect Effects 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
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- 230000033228 biological regulation Effects 0.000 description 1
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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 discloses a single-power multi-load wireless charging system, which relates to the technical field of wireless power transmission and comprises primary side equipment and secondary side equipment; the primary side equipment comprises a primary side inversion end, a primary side resonant network and a transmitting coil which are connected in sequence; the secondary side equipment comprises a receiving coil, a secondary side resonant network, a secondary side rectifying circuit and a load which are connected in sequence; the transmitting coil and the receiving coil are mutually inductive coupling mechanisms; the primary side inversion end can output a plurality of high-frequency currents with different frequencies to the primary side resonance network after harmonic matching; the coupling mechanism carries out tuning according to the received corresponding current frequency; the transmitting coil is loaded with a plurality of high-frequency currents with different frequencies simultaneously. A plurality of loads on the secondary side of the system can be in the same charging state, the transmitting coil is efficiently utilized, the space is saved, and the system transmission efficiency is maximized.
Description
Technical Field
The invention belongs to the technical field of wireless power transmission, and particularly relates to a single-power-supply multi-load wireless charging system.
Background
The multi-load Wireless Power Transmission (WPT) system is a system in which only one primary side power transmitting part is provided and a plurality of secondary side power receiving parts are provided. The system can realize the non-contact power supply of a plurality of electric equipment by one power supply source, and has wider and wider application range for the utilization rate of the transmitting coil to be higher than that of a single-input single-output WPT system.
Most of the existing multi-load WPT systems use a group of large transmitting coils and a plurality of groups of small receiving coil structures, and the mode has low utilization rate of the transmitting coils, and the magnetic field distribution of the transmitting coils is uneven, so that the multi-load WPT systems are not beneficial to providing energy for a plurality of groups of same loads; the other mode is a multi-stage load power supply mode, a plurality of relay coils are used for transferring energy for multiple loads, the energy transmission distance is increased, and meanwhile, multi-path output is achieved.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a single-power-supply multi-load wireless charging system which adopts a frequency division control method, currents with different frequencies are generated by a plurality of inverters and loaded to a primary side transmitting coil, the primary side transmitting coil and a corresponding secondary side receiving coil are in coupling resonance, a plurality of loads on a secondary side can be in the same charging state, meanwhile, the transmitting coil is efficiently utilized, the space is saved, an original secondary side resonance network is independently tuned according to each working frequency, and the maximization of the transmission efficiency of the system is realized.
In order to achieve the purpose, the invention adopts the following technical scheme:
a single-power multi-load wireless charging system comprises primary equipment and secondary equipment, wherein the primary equipment and the secondary equipment are coupled with each other; the secondary side equipment comprises a receiving coil, a secondary side resonant network, a secondary side rectifying circuit and a load which are connected in sequence; the transmitting coil and the receiving coil form a mutual inductance coupling mechanism to charge a load;
the primary side inversion end can output a plurality of high-frequency currents with different frequencies to the primary side resonance network after resonance matching; the coupling mechanism carries out tuning according to the received corresponding current frequency; the transmitting coil is loaded with a plurality of high-frequency currents with different frequencies simultaneously.
Further, the primary side inverter terminal comprises a power tube Q 1 ～Q 8 Power tube Q 1 ～Q 4 The inverter circuit 1 is connected with a primary side alternating current power supply; power tube Q 5 ～Q 8 The inverter circuit 2 is connected with a primary side alternating current power supply; the primary side alternating current power supply generates two currents with different frequencies through the inverter circuit 1 and the inverter circuit 2.
Further, the primary resonant network includes an inductor L 1P Inductor L 2P Capacitor C 1P Capacitor C 2P Capacitor C 3P Capacitor C 4P (ii) a The above-mentioned inductance L 1P Respectively connected with a capacitor C 1P Capacitor C 2P Series connection, capacitor C 1P And a capacitor C 2P The resonant network 1 is formed by parallel connection and is connected with the inverter circuit 1; the above-mentioned inductance L 2P Respectively connected with a capacitor C 3P Capacitor C 4P Series connection, capacitor C 3P And a capacitor C 4P The resonant network 2 is formed by parallel connection and is connected with the inverter circuit 2; the primary side resonant network 1 and the primary side resonant network 2 superpose two currents with different frequencies on the same transmitting coil.
Further, the method can be used for preparing a novel materialThe receiving coil comprises a receiving coil L 2 And a receiving coil L 3 (ii) a Two different frequency current on the transmitting coil and the receiving coil L 2 Or a receiving coil L 3 Coupling, and outputting characteristics of an original secondary side loop corresponding to the load 1:
the output current is:
the output power is:
two different frequency currents on the transmitting coil and the receiving coil L 2 Or a receiving coil L 3 Coupling, and the output characteristic of the original secondary side loop corresponding to the load 2 is as follows:
the output current is:
the output power is:
further, the secondary resonant network includes an inductor L 1s Inductor L 2s Capacitor C 1s Capacitor C 2s Capacitor C 3s Capacitor C 4s (ii) a The inductance L 1s Respectively connected with a capacitor C 1s Capacitor C 2s Series connection, capacitor C 1s And a capacitor C 2s The secondary resonant network 1 is formed by parallel connection and is connected with the rectifying circuit 1; the inductance L 2s Respectively connected with a capacitor C 3s Capacitor C 4s Series connection, capacitor C 3s And a capacitor C 4s The secondary resonant network 2 is formed by parallel connection and is connected with the rectifying circuit 2.
Further, the rectifier circuit comprises a rectifier circuit 1 and a rectifier circuit 2; the rectifying circuit 1 or the rectifying circuit 2 converts alternating current into direct current to charge the load 1 or the load 2.
Further, the receiving coil is fixed to the robot.
Advantageous effects
The system loads a plurality of high-frequency currents with large frequency difference simultaneously through a single primary-side transmitting coil, so that the high-efficiency utilization of the single transmitting coil is realized, and the space and the wire consumption of a coupling mechanism are saved; the method has the advantages that the loads in different working states (constant voltage or constant current) are charged simultaneously by simultaneously generating working currents with different frequencies, and the problem that the conventional multi-load WPT system can only charge the load in a single working state is solved; each resonance loop of the system is tuned according to respective frequency, the influence of mutual inductance of a plurality of receiving coils is basically eliminated, and decoupling among a plurality of secondary coils is realized.
Drawings
FIG. 1 is a block diagram of the system of the present invention;
FIG. 2 is a schematic diagram of the circuit of the present invention;
FIG. 3 is a schematic view of the xy-plane excitation magnetic field direction of the transmitting coil of the present invention;
FIG. 4 is a schematic diagram of the direction of the xz plane excitation magnetic field of the transmitting coil according to the present invention;
Detailed Description
The technical solutions in the embodiments will be described clearly and completely with reference to the drawings in the embodiments, and it is obvious that the described embodiments are some, not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the present embodiment, belong to the protection scope of the present invention.
The embodiment provides a single-power-supply multi-load wireless charging system, which is shown in fig. 1 and comprises a primary side device and a secondary side device. The primary side inversion end, the primary side resonant network and the transmitting coil in the coupling mechanism are sequentially coupled to form primary side equipment. And the input of the primary side inversion end is connected with an external power supply. The receiving coil, the secondary resonant network, the secondary rectifying circuit and the load in the coupling mechanism are sequentially coupled to form secondary equipment. The transmitter coil and the receiver coil are coupling mechanisms that are mutually inductive.
As shown in fig. 1 and 2, the primary side inverter comprises a power tube Q 1 ～Q 8 Power tube Q 1 ～Q 4 Form an inverter circuit 1, a power tube Q 5 ～Q 8 Constituting an inverter circuit 2. The primary resonant network comprises an inductor L 1P Inductor L 2P Capacitor C 1P Capacitor C 2P Capacitor C 3P Capacitor C 4P . Inductor L 1P Respectively connected with a capacitor C 1P Capacitor C 2P Series connection, capacitor C 1P And a capacitor C 2P The parallel connection forms a resonant network 1 and is connected with an inverter circuit 1. Inductor L 2P Respectively connected with a capacitor C 3P Capacitor C 4P Series connection, capacitor C 3P And a capacitor C 4P The parallel connection forms a resonant network 2 connected with an inverter circuit 2.
The coupling mechanism comprises a transmitting coil L 1 Receiving coil L 2 And a receiving coil L 3 Transmitting coil L 1 And a receiving coil L 2 Has a mutual inductance of M 1 Transmitting coil L 1 And a receiving coil L 3 Has a mutual inductance of M 2 A receiving coil L 2 And a receiving coil L 3 Has a mutual inductance of M 3 。
The secondary resonant network comprises an inductor L 1s Inductor L 2s Capacitor C 1s Capacitor C 2s Capacitor C 3s Capacitor C 4s (ii) a Inductor L 1s Respectively connected with a capacitor C 1s Capacitor C 2s Series connection, capacitor C 1s And a capacitor C 2s The secondary resonant network 1 is formed by parallel connection and is connected with the rectifying circuit 1; inductor L 2s Respectively connected with a capacitor C 3s Capacitor C 4s Series connection, capacitor C 3s And a capacitor C 4s The secondary resonant network 2 is formed by parallel connection and is connected with the rectifying circuit 2.
The secondary side rectifier circuit includes a rectifier circuit 1 and a rectifier circuit 2.
The load comprises a load 1 and a load 2, the load 1 is connected with the rectifying circuit 1, the load 2 is connected with the rectifying circuit 2, and the load refers to a device respectively provided with a receiving coil L 2 And a receiving coil L 3 2 robots.
When an external alternating current power supply passes through the inverter circuit 1, first high-frequency alternating current with corresponding frequency is generated, and when the external alternating current power supply passes through the inverter circuit 2, second high-frequency alternating current with corresponding frequency is generated, and the frequency difference between the first high-frequency current and the second high-frequency current is large; the first high-frequency current enters the resonant network 1 for compensation and is further superposed on the transmitting coil L 1 At the same time, the second high-frequency current entering the resonant network 2 is compensated and is likewise superposed on the transmitting coil L 1 At this time, the transmitting coil L 1 In the presence of currents of two different frequencies, a transmitting coil L 1 A high-frequency conversion magnetic field is generated in space, and a corresponding receiving coil L 2 Receiving coil L 3 And a transmitting coil L 1 Coupling is generated, and electromagnetic-electric conversion is realized; the system is operated by a single transmitting coil L 1 And meanwhile, two high-frequency currents with large frequency difference are loaded, so that the efficient utilization of a single transmitting coil is realized, and the space and the wire consumption of a coupling mechanism are saved.
The system pairThe electric energy conversion part of the side equipment converts the received electric energy into a form required by a load, plays the roles of power regulation and impedance conversion simultaneously, and coordinates with the primary side equipment; receiving coil L 2 High-frequency current generated by the electromagnetic induction effect is compensated by the secondary resonant network 1 and then is output to the load 1 through the rectifying circuit 1 for charging, and the output characteristics are as follows:
the output current is:
the output power is:
receiving coil L 3 High-frequency current generated by the electromagnetic induction effect is compensated by the secondary resonant network 2 and then is output to the load 2 through the rectifying circuit 2 for charging, and the output characteristics are as follows:
the output current is:
the output power is:
alternatively, the resonant network used in this embodiment is an LCC-LCC type compensation network, and equivalent SS type, LCC-S type, and other compensation networks can be used to achieve the same effect.
In the embodiment, the coupling mechanism of the system is simulated and researched by utilizing the multi-physical-field simulation software COMSOL, and the parameters of the coil are shown in Table 1.
TABLE 1 coil parameters
| Parameter name | Parameter value | Parameter name | Parameter value |
| L 1 | 71.24μH | M 1 | 3.4μH |
| L 2 | 20.36μH | M 2 | 2.31μH |
| L 3 | 27.54μH | M 3 | 10-6μH |
As shown in fig. 3 and 4, the transmitting coil L 1 Generate magnetic fields along the x-axis and y-axis on both sides, respectively, and effectively correspond to the corresponding receiving coils (i.e., receiving coil L) 2 And a receiving coil L 3 ) Coupling occurs and the magnetic field strength is distributed more uniformly in the z-axis direction, so that the receiving coil (i.e., the receiving coil L) 2 And a receiving coil L 3 ) Has a larger tolerance to offset (only the z-axis offset is taken as an example here, because the receiving coil L 2 And a receiving coil L 3 Fixed to the robot, without an offset perpendicular to the ground, the xz plane).
In combination with the coil simulation parameters of Table 1, it can be seen that the mutual inductance M between the receiver coil and the transmitter coil is compared 1 、M 2 In other words, because the frequency difference between different currents is large, and each resonant circuit is tuned according to respective frequency, the system reactive loss generated by the inductance coil is reduced, the transmission of active power is ensured, and at the moment, the receiving coil L is connected with the receiving coil L through the resonant circuit 2 And a receiving coil L 3 Mutual inductance M of 3 Almost can be ignored, and better decoupling is realized.
Alternatively, when the system employs a dual-sided multiplexed transmit coil configuration, only the transmit coil L is used 1 And a receiving coil L 2 And a receiving coil L 3 The mutual inductance M1 and M2 exist, a plurality of transmitting coils and a plurality of receiving coils cannot be mutually interfered, and inverters of two sets of transmitting systems output different frequencies under the control action of a single chip microcomputer.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; these modifications and substitutions do not cause the essence of the corresponding technical solution to depart from the scope of the technical solution of the embodiments of the present invention, and are intended to be covered by the claims and the specification of the present invention.
Claims (7)
1. A single-power-supply multi-load wireless charging system comprises primary equipment and secondary equipment, wherein the primary equipment and the secondary equipment are coupled with each other; the secondary side equipment comprises a receiving coil, a secondary side resonant network, a secondary side rectifying circuit and a load which are connected in sequence; the transmitting coil and the receiving coil form a mutual inductance coupling mechanism;
the primary side inversion end can output a plurality of high-frequency currents with different frequencies to the primary side resonance network after the harmonic matching; the coupling mechanism carries out tuning according to the received corresponding current frequency; the transmitting coil is loaded with a plurality of high-frequency currents with different frequencies simultaneously.
2. The single power supply multi-load wireless charging system according to claim 1, wherein: the primary side inverter end comprises a power tube Q 1 ～Q 8 Power tube Q 1 ～Q 4 The inverter circuit 1 is connected with a primary side alternating current power supply; power tube Q 5 ～Q 8 The inverter circuit 2 is connected with a primary side alternating current power supply; the primary side alternating current power supply generates two currents with different frequencies through the inverter circuit 1 and the inverter circuit 2.
3. The single-power-supply multi-load wireless charging system as claimed in claim 2, wherein the primary resonant network comprises an inductor L 1P Inductor L 2P Capacitor C 1P Capacitor C 2P Capacitor C 3P Capacitor C 4P (ii) a The inductance L 1P Respectively connected with a capacitor C 1P Capacitor C 2P In series, electricityContainer C 1P And a capacitor C 2P The resonant network 1 is formed by parallel connection and is connected with the inverter circuit 1; the inductance L 2P Respectively connected with a capacitor C 3P Capacitor C 4P Series connection, capacitor C 3P And a capacitor C 4P The resonant network 2 is formed by parallel connection and is connected with the inverter circuit 2; the primary side resonant network 1 and the primary side resonant network 2 superpose two currents with different frequencies on the same transmitting coil.
4. The single power supply multi-load wireless charging system as claimed in claim 3, wherein the receiving coil comprises a receiving coil L 2 Receiving coil L 3 (ii) a Two different frequency currents on the transmitting coil and the receiving coil L 2 Or a receiving coil L 3 Coupling, and outputting characteristics of an original secondary side loop corresponding to the load 1:
the output current is:
；
the output power is:
；
two different frequency currents on the transmitting coil and the receiving coil L 2 Or a receiving coil L 3 Coupling, the output characteristic of the original secondary side loop corresponding to the load 2:
the output current is:
；
the output power is:
。
5. the single-power-supply multi-load wireless charging system as claimed in claim 1, wherein the secondary resonant network comprises an inductor L 1s An inductor L 2s Capacitor C 1s Capacitor C 2s Capacitor C 3s Capacitor C 4s (ii) a The inductance L 1s Respectively connected with a capacitor C 1s Capacitor C 2s Series connection, capacitor C 1s And a capacitor C 2s The secondary resonant network 1 is formed by parallel connection and is connected with the rectifying circuit 1;the inductance L 2s Respectively connected with a capacitor C 3s Capacitor C 4s Series connection, capacitor C 3s And a capacitor C 4s The secondary resonant network 2 is formed by parallel connection and is connected with the rectifying circuit 2.
6. The single-power-supply multi-load wireless charging system according to claim 5, wherein the rectifying circuit comprises a rectifying circuit 1 and a rectifying circuit 2; the rectifying circuit 1 or the rectifying circuit 2 converts the received alternating current into direct current to charge the load 1 or the load 2.
7. The single power supply multi-load wireless charging system as claimed in claim 1, wherein the receiving coil is fixed on the robot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210704272.4A CN115001161A (en) | 2022-06-21 | 2022-06-21 | Single-power-supply multi-load wireless charging system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210704272.4A CN115001161A (en) | 2022-06-21 | 2022-06-21 | Single-power-supply multi-load wireless charging system |
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| CN115001161A true CN115001161A (en) | 2022-09-02 |
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| CN202210704272.4A Withdrawn CN115001161A (en) | 2022-06-21 | 2022-06-21 | Single-power-supply multi-load wireless charging system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117060604A (en) * | 2023-10-12 | 2023-11-14 | 南方电网数字电网研究院有限公司 | Wireless power supply system and power transmission system |
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2022
- 2022-06-21 CN CN202210704272.4A patent/CN115001161A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117060604A (en) * | 2023-10-12 | 2023-11-14 | 南方电网数字电网研究院有限公司 | Wireless power supply system and power transmission system |
| CN117060604B (en) * | 2023-10-12 | 2024-03-12 | 南方电网数字电网研究院股份有限公司 | Wireless power supply system and power transmission system |
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Application publication date: 20220902 |