CN111064284A - Resonant wireless power receiving terminal with near field communication function - Google Patents
Resonant wireless power receiving terminal with near field communication function Download PDFInfo
- Publication number
- CN111064284A CN111064284A CN201811202981.2A CN201811202981A CN111064284A CN 111064284 A CN111064284 A CN 111064284A CN 201811202981 A CN201811202981 A CN 201811202981A CN 111064284 A CN111064284 A CN 111064284A
- Authority
- CN
- China
- Prior art keywords
- wireless power
- nfc
- receiving terminal
- resonant
- power receiving
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004891 communication Methods 0.000 title description 6
- 230000005540 biological transmission Effects 0.000 claims abstract description 47
- 239000003990 capacitor Substances 0.000 claims abstract description 13
- 230000015556 catabolic process Effects 0.000 claims 1
- 238000006731 degradation reaction Methods 0.000 claims 1
- 230000005855 radiation Effects 0.000 abstract description 13
- 230000008030 elimination Effects 0.000 abstract description 2
- 238000003379 elimination reaction Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
- H04B5/24—Inductive coupling
- H04B5/26—Inductive coupling using coils
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
- H04B5/79—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for data transfer in combination with power transfer
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Power Engineering (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Near-Field Transmission Systems (AREA)
Abstract
A resonant wireless power receiving terminal with an NFC function comprises a shunt capacitor and a large impedance circuit based on a band elimination filter. According to the invention, the shunt capacitor is connected in parallel on the wireless electric energy receiving coil, so that the radiation noise of the wireless electric energy transmission circuit element can be inhibited; by connecting the large impedance circuit in series on the wireless power receiving coil, the concurrent interference between the wireless power transmission resonance coil and the NFC antenna can be suppressed.
Description
Technical Field
The invention relates to the field of resonant wireless power transmission, in particular to a resonant wireless power receiving terminal which can reduce electromagnetic interference and has a Near Field Communication (NFC) function.
Background
With the development and maturity of wireless power transmission technology, more and more electronic devices begin to adopt wireless charging, and because many electronic devices also have an NFC function, an NFC antenna and a wireless power transmission resonant coil need to be configured on the same mobile terminal at the same time. But due to the radiated noise of the elements of the wireless power transmission circuit and the concurrent interference between the NFC antenna and the wireless power transmission resonance coil, the NFC signal and the wireless power transmission power are reduced. Interference suppression by improving a resonance terminal device of a resonance type wireless power transmission system is an important way to solve the problem.
The wireless charging and NFC dual-coil coexistence circuit disclosed in the document considers the mutual noninterference between the resonant frequency of the wireless charging circuit and the frequency of an NFC transmitting signal, but does not consider the problem of the radiation noise of the components of the wireless power transmission circuit, and has limited suppression effect on the signal interference.A system and a method for sharing an antenna between NFC and wireless charging (application No. 201710743416) disclose a system for sharing an antenna between NFC and wireless charging, which utilizes a CPU to control an antenna switch to switch between NFC and wireless charging, thereby realizing two functions without generating an interference problem, but cannot simultaneously perform due to the switching of the NFC function and the wireless charging function, thereby resulting in a lower system utilization rate.
Disclosure of Invention
In order to overcome the defects of the existing resonant wireless power transmission system with the NFC function, the invention aims to provide a resonant terminal device capable of reducing electromagnetic interference in the resonant wireless power transmission and reception system, which can suppress the problem of element radiation noise in a wireless power transmission circuit and the problem of concurrent interference between a wireless power transmission resonant coil and an NFC antenna, and improve the system information transmission and energy transmission performance.
In order to achieve the purpose, the invention adopts the technical scheme that: resonant mode wireless power receiving terminal with NFC function includes: shunt capacitance, large impedance circuit based on band stop filter.
The shunt capacitor is connected in parallel to the wireless power transmission resonant coil, high-frequency element radiation noise generated by the wireless power transmission circuit is easy to circulate in a loop through the shunt capacitor and cannot enter a rear-stage circuit, so that interference caused by harmonic radiation is weakened, and for the wireless power transmission current frequency, the shunt capacitor presents larger impedance, so that energy is smoothly transmitted to the rear-stage circuit.
The large impedance circuit based on the band-stop filter is arranged at the front end or the rear end of the shunt capacitor and is at least arranged on one of the transmitting end resonator or the receiving end resonator, the band-stop filter presents large impedance in an NFC frequency bandwidth, the serious concurrent interference between the wireless power transmission resonant coil and the NFC antenna is improved, and therefore the defects that NFC signals are weakened and the transmission power of a wireless power transmission system is reduced are overcome.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. the resonant wireless power receiving terminal with the NFC function has the function of reducing the radiation noise of the wireless power transmission circuit element, can effectively weaken the harmonic radiation generated by the circuit, and prevents the harmonic radiation from radiating outside to cause interference to other equipment in the environment.
2. The resonant wireless power receiving terminal with the NFC function can solve the problem of concurrent interference between the wireless power transmission resonant coil and the NFC antenna, and avoids interference and energy loss caused by deviation of NFC signal frequency and wireless power transmission frequency.
Drawings
Fig. 1 is a plan view of an NFC antenna and a wireless power receiving resonant coil in the present invention;
fig. 2 is a schematic structural diagram of an NFC antenna and a wireless power receiving resonant coil on a mobile terminal according to the present invention;
fig. 3 is a side view of an NFC antenna and a wireless power receiving resonant coil in accordance with the present invention;
fig. 4 is a specific circuit implementation of the resonant wireless power receiving terminal according to the present invention.
Detailed Description
In order to better understand the technical solution of the present invention, the following further describes the working principle and the implementation mode of the present invention with reference to the attached drawings.
Fig. 1 to 3 show physical positions of the NFC antenna and the wireless power reception resonant coil on the mobile terminal. As shown in the plan view of fig. 1, both the NFC antenna and the wireless power transmission resonance coil have a loop structure, and the wireless power transmission resonance coil is disposed inside the NFC antenna. As shown in the schematic structural diagram of fig. 2, the NFC antenna is mounted on the back surface of the main body of the mobile terminal as a part of the detachable battery, and the wireless power transmission resonance coil is mounted on the rear case of the mobile terminal. As shown in the side view of fig. 3, horizontal and vertical isolation distances are provided between the NFC antenna and the radio transmission resonant coil. In the aspect of physical position, the appropriate horizontal and vertical spacing distance is designed, and mutual noninterference between the NFC antenna and the wireless power transmission resonant coil is guaranteed. Theoretically, the larger the separation distance in the available space, the smaller the signal and power interference between the two, and the better the isolation characteristic, but since the mobile terminal has a small volume and a small available installation area, it is practically impossible to design the horizontal and vertical separation distances between the two to be large, so that the interference can not be sufficiently suppressed only by this method, and further improvement is required in cooperation with other strategies.
Fig. 4 shows a specific circuit diagram implementation of the present invention on a resonant wireless power receiving terminal. On the one hand, in order to prevent harmonic radiation generated by the wireless electric energy transmission circuit from radiating to the outside, a shunt capacitor is connected in parallel to the wireless electric energy transmission resonant coil, so that harmonic radiation only flows in a shunt capacitor loop without affecting a rear-stage circuit, and the problem that the conventional resonant wireless electric energy receiving terminal cannot filter out harmonic current, and harmonic enters the rear-stage radiation to the environment to interfere with signals of other equipment is solved. On the other hand, the volume of the mobile terminal itself is limited, so that the NFC antenna and the wireless power transmission resonant coil are spaced apart from each other at a small interval, and a communication signal of NFC may be coupled with the wireless power transmission resonant coil and thus leaked along the wireless power transmission path. In order to solve the problem, a large-impedance circuit relative to the NFC frequency bandwidth is connected in series on the wireless power transmission resonant coil, so that the problem that communication signals of NFC leak along a wireless power transmission path is solved. Specifically, in order to ensure the isolation between the NFC antenna and the wireless power transmission resonant coil without changing the physical structure, a large impedance circuit with respect to the near field communication frequency bandwidth is connected in series to at least one of the transmitting end resonant coil or the receiving end resonant coil, the large impedance circuit is implemented by a band elimination filter, and the series connection position of the large impedance circuit may be before or after the shunt capacitor. According to the design, on the resonance terminal equipment, the shunt capacitor is connected in parallel at two ends of the wireless power transmission resonance coil and used for inhibiting harmonic radiation of the wireless power transmission circuit; a circuit with larger impedance relative to NFC frequency is connected in series on a wireless power transmission path, and the problem of mutual interference between a wireless power transmission resonance coil and an NFC antenna is solved.
To sum up, the resonant wireless power receiving terminal device of the present invention solves the following problems: a problem of element radiation noise due to a wireless power transmission circuit; and a problem of a decrease in NFC signal and wireless power transmission power due to concurrent interference between the wireless power transmission resonance coil and the NFC antenna.
Claims (3)
1. A resonant wireless power receiving terminal with an NFC function, the wireless power receiving terminal comprising: a shunt capacitor, a large impedance circuit based on a band stop filter; the shunt capacitor is connected in parallel to the wireless charging resonator; the large impedance circuit based on the band-stop filter is connected in series at the front end or the rear end of the shunt capacitor and is installed on at least one of the transmitting end resonator or the receiving end resonator.
2. The NFC-enabled resonant wireless power receiving terminal of claim 1, wherein the added shunt capacitance suppresses radiated noise from the wireless power transfer circuit element.
3. The resonant wireless power receiving terminal with the NFC function according to claim 1, wherein the added band-stop filter presents a large impedance at the NFC frequency bandwidth, suppressing a decrease in transmission power and a signal degradation caused by a concurrent interference between the wireless power transmission resonant coil and the NFC antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811202981.2A CN111064284A (en) | 2018-10-16 | 2018-10-16 | Resonant wireless power receiving terminal with near field communication function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811202981.2A CN111064284A (en) | 2018-10-16 | 2018-10-16 | Resonant wireless power receiving terminal with near field communication function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111064284A true CN111064284A (en) | 2020-04-24 |
Family
ID=70296541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811202981.2A Pending CN111064284A (en) | 2018-10-16 | 2018-10-16 | Resonant wireless power receiving terminal with near field communication function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111064284A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113036942A (en) * | 2021-03-12 | 2021-06-25 | 哈尔滨工业大学 | Wireless charging system of super capacitor |
-
2018
- 2018-10-16 CN CN201811202981.2A patent/CN111064284A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113036942A (en) * | 2021-03-12 | 2021-06-25 | 哈尔滨工业大学 | Wireless charging system of super capacitor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3780270B1 (en) | Antenna system and terminal device | |
| EP2583351B1 (en) | Antenna system with parasitic element for hearing aid compliant electromagnetic emission | |
| US10084236B2 (en) | Tunable antenna and terminal | |
| US9819091B2 (en) | Portable terminal and slot antenna thereof | |
| US10230274B2 (en) | Resonance terminal device for resonant wireless power reception system | |
| US9954275B2 (en) | Multiple-input multiple-output antenna, system and mobile terminal | |
| CN106299598A (en) | Electronic installation and many feed antennas thereof | |
| EP2894717B1 (en) | Antenna | |
| US20220329280A1 (en) | Radio frequency module, control method, and electronic device | |
| CN103688599A (en) | PCB used in wireless terminal and wireless terminal | |
| JP2007143171A (en) | Wireless communication apparatus and wireless communication method | |
| CN111064284A (en) | Resonant wireless power receiving terminal with near field communication function | |
| CN110829023B (en) | Antenna module and terminal | |
| CN205141145U (en) | Many antenna structure and metal mobile terminal | |
| CN201167317Y (en) | Circuit capable of reducing higher-order harmonics interference of baseband clock signal | |
| CN111082814A (en) | Method and device for downlink signal transmission in dual-connection architecture, and terminal | |
| CN215869802U (en) | Antenna module and electronic equipment | |
| CN203377355U (en) | 4G low-pass high-interference-suppression multipath filter module | |
| CN110958027B (en) | Radio frequency front-end device and radio frequency communication system | |
| CN205564986U (en) | Multifrequency LTE antenna isolating device | |
| CN105141377A (en) | Ultra-short-wave portable interference control system | |
| CN202094282U (en) | Whip antenna | |
| JP2013017008A (en) | Radio communication device | |
| CN113629371A (en) | Filter and communication equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20200424 |
|
| WD01 | Invention patent application deemed withdrawn after publication |