CN204408421U - Based on the NFC mobile phone Circuits System of Adaptive matching circuit - Google Patents
Based on the NFC mobile phone Circuits System of Adaptive matching circuit Download PDFInfo
- Publication number
- CN204408421U CN204408421U CN201520065696.6U CN201520065696U CN204408421U CN 204408421 U CN204408421 U CN 204408421U CN 201520065696 U CN201520065696 U CN 201520065696U CN 204408421 U CN204408421 U CN 204408421U
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- electric capacity
- circuit
- nfc chip
- antenna
- mobile phone
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Abstract
The utility model discloses a kind of NFC mobile phone Circuits System based on Adaptive matching circuit, comprise the NFC chip circuit, filter circuit, match circuit and the antenna circuit that connect successively, described NFC chip circuit is connected with described antenna circuit further, described NFC chip circuit comprises NFC chip, variable capacitance and current management control circuit is connected with further between described match circuit and antenna circuit, the output of described variable capacitance and described match circuit is connected in parallel, and described current management control circuit is connected with described variable capacitance.Compared with prior art, the utility model according to the operating frequency of existing POS operating frequency adjustment itself, can coordinate most POS work.
Description
Technical field
The utility model relates to portable mobile termianl nfc card application, particularly relates to a kind of NFC mobile phone Circuits System based on Adaptive matching circuit.
Background technology
Near field communication (NFC) (Near Field Communication, hereinafter referred to as NFC) be developed by non-contact radio-frequency identification (RFID) and the Technology Integration that interconnects, combining induction card reader, induction type card and point-to-point function on one chip, can carry out identifying and exchanges data with compatible equipment in short distance, operating frequency is 13.56MHz, now be used for mobile phone, make mobile phone possess non-contact card function and the non-function connecing POS.
Promote through the several years, NFC technique is existing purposes comparatively widely at home.But because NFC standard does not have mandatory requirement to operating frequency, the POS work ratio of existing domestic POS manufacturers produce contains 13Mhz-17MHz, corresponding match circuit would not change after mobile phone volume production again, makes Mobile phone card function be fixed on an operating frequency.Existing NFC mobile phone cannot contain all frequency ranges in 13MHz-17MHz because of technical bottleneck, and existing POS has Multi-Frequency, and thus often can run into mobile phone cannot the situation of brush POS.
Therefore, be necessary to provide a kind of new NFC mobile phone Circuits System to solve the problems referred to above.
Utility model content
The purpose of this utility model be to provide a kind of can according to the operating frequency of existing POS operating frequency adjustment itself, the NFC mobile phone Circuits System based on Adaptive matching circuit that can coordinate most POS work.
To achieve these goals, the technical scheme that adopts of the utility model is as follows:
A kind of NFC mobile phone Circuits System based on Adaptive matching circuit, comprise the NFC chip circuit, filter circuit, match circuit and the antenna circuit that connect successively, described NFC chip circuit is connected with described antenna circuit further, described NFC chip circuit comprises NFC chip, variable capacitance and current management control circuit is connected with further between described match circuit and antenna circuit, the output of described variable capacitance and described match circuit is connected in parallel, and described current management control circuit is connected with described variable capacitance.
Preferably, the capacitance value range of described variable capacitance is 1-20pf.
Preferably, described filter circuit comprises the first inductance, the second inductance, the first electric capacity and the second electric capacity, the first end of described first inductance is connected with the first signal transmitting terminal of described NFC chip, second end of described first inductance is connected with the first end of described first electric capacity, the first end of described second inductance is connected with the secondary signal transmitting terminal of described NFC chip, second end of described second inductance is connected with the first end of described second electric capacity, is connected further after the second end of described first electric capacity is connected with the second end of described second electric capacity with ground wire.
Preferably, described match circuit comprises the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity and the 6th electric capacity, described 3rd electric capacity is connected between the first end of described first electric capacity and the first end of described 4th electric capacity, described 5th electric capacity is connected between the first end of described second electric capacity and the first end of described 6th electric capacity, the second end of described 4th electric capacity, is interconnected between the second end of described 6th electric capacity and the second end of described first electric capacity.
Preferably, described antenna circuit comprises antenna and the first resistance, the second resistance, the first end of described first resistance is connected with the first end of described 4th electric capacity, second end of described first resistance is connected with the first end of described antenna, the first end of described second resistance is connected with the first end of described 6th electric capacity, and the second end of described second resistance is connected with the second end of described antenna.
Preferably, described NFC chip circuit also comprises the 3rd resistance, the 4th resistance, the 7th electric capacity, the 8th electric capacity, between the first end that described 3rd resistance and described 7th capacitances in series are connected to described first electric capacity and the first signal receiving end of described NFC chip, between the first end that described 4th resistance and described 8th capacitances in series are connected to described second electric capacity and the secondary signal receiving terminal of described NFC chip.
Preferably, described NFC chip circuit also comprises the 9th electric capacity and the tenth electric capacity, described 9th electric capacity is connected between the first end of described antenna and the first antenna input interface of described NFC chip, and described tenth electric capacity is connected between the second end of described antenna and the second antenna input interface of described NFC chip.
Preferably, described NFC chip circuit also comprises the 11 electric capacity, and described 11 electric capacity is connected between the internal reference voltage output end of described NFC chip and ground wire.
Compared with prior art, the utility model is based on the beneficial effect of the NFC mobile phone Circuits System of Adaptive matching circuit: described current management control circuit can the size of variable capacitance described in control break, thus change the operating frequency of whole NFC mobile phone Circuits System, expand the scope of operating frequency, can with more POS cooperating.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model based on the NFC mobile phone Circuits System of Adaptive matching circuit.
Embodiment
Below in conjunction with specific embodiment, the utility model is described further.
Refer to shown in Fig. 1, the utility model comprises based on the NFC mobile phone Circuits System of Adaptive matching circuit the NFC chip circuit 1 connected successively, filter circuit 2, match circuit 3 and antenna circuit 4, described NFC chip circuit 1 is connected with described antenna circuit 4 further, described NFC chip circuit 1 comprises NFC chip, variable capacitance C0 and current management control circuit is connected with further between described match circuit 3 and antenna circuit 4, the output of described variable capacitance C0 and described match circuit 3 is connected in parallel, the capacitance value range of described variable capacitance C0 is 1-20pf, described current management control circuit is connected with described variable capacitance C0, in the present embodiment, described current management control circuit comprises current-mode control chip.
Described filter circuit 2 comprises the first inductance L 1, second inductance L 2, first electric capacity C1 and the second electric capacity C2, the first end of described first inductance L 1 is connected with the first signal transmitting terminal of described NFC chip, second end of described first inductance L 1 is connected with the first end of described first electric capacity C1, the described first end of the second inductance L 2 is connected with the secondary signal transmitting terminal of described NFC chip, second end of described second inductance L 2 is connected with the first end of described second electric capacity C2, be connected with ground wire further after second end of described first electric capacity C1 is connected with second end of described second electric capacity C2.
Described match circuit 3 comprises the 3rd electric capacity C3, the 4th electric capacity C4, the 5th electric capacity C5 and the 6th electric capacity C6, described 3rd electric capacity C3 is connected between the first end of described first electric capacity C1 and the first end of described 4th electric capacity C4, described 5th electric capacity C5 is connected between the first end of described second electric capacity C2 and the first end of described 6th electric capacity C6, second end of described 4th electric capacity C4, is interconnected between second end of described 6th electric capacity C6 and second end of described first electric capacity C1.
Described antenna circuit 4 comprises antenna and the first resistance R1, the second resistance R2, the first end of described first resistance R1 is connected with the first end of described 4th electric capacity C4, second end of described first resistance R1 is connected with the first end of described antenna, the first end of described second resistance R2 is connected with the first end of described 6th electric capacity C6, and described second end of the second resistance R2 is connected with the second end of described antenna.
Described NFC chip circuit 1 also comprises the 3rd resistance R3, the 4th resistance R4, the 7th electric capacity C7, the 8th electric capacity C8, between the first end that described 3rd resistance R3 and described 7th electric capacity C7 is connected in series in described first electric capacity C1 and the first signal receiving end of described NFC chip, between the first end that described 4th resistance R4 and described 8th electric capacity C8 is connected in series in described second electric capacity C2 and the secondary signal receiving terminal of described NFC chip.
Described NFC chip circuit 1 also comprises the 9th electric capacity C9, the tenth electric capacity C10 and the 11 electric capacity C11, described 9th electric capacity C9 is connected between the first end of described antenna and the first antenna input interface of described NFC chip, described tenth electric capacity C10 is connected between the second end of described antenna and the second antenna input interface of described NFC chip, and described 11 electric capacity C11 is connected between the internal reference voltage output end of described NFC chip and ground wire.
Operation principle of the present utility model is: when mobile phone is as card brush POS, and NFC chip can't help cellular phone power supplies provides energy, produces induced voltage completely by POS and mobile phone near-field coupling, is carried in antenna ends for NFC mobile phone Circuits System and provides electric energy.POS frequency is fixed, and mobile phone NFC antenna is operated in different frequency also to be had different from POS stiffness of coupling.Described current-mode control chip sets a current threshold, enough energy cannot be provided normally to work for NFC chip lower than this threshold value, Non-follow control variable capacitance C0 poll between 1-20pf is attempted, the operating frequency of NFC mobile phone can be changed, when current-mode control chip monitor electric current be greater than threshold value time, show that mobile phone NFC chip can normally work, now antenna for mobile phone and POS near-field coupling, normally quick during Mobile phone card brush POS, the capacitance size of variable capacitance C0 remains unchanged.
Schematically above be described the utility model and execution mode thereof, this description does not have restricted, and also just one of the execution mode of the present utility model shown in accompanying drawing, actual structure is not limited thereto.So, if those of ordinary skill in the art enlightens by it, when not departing from the utility model and creating aim, design the frame mode similar to this technical scheme and embodiment without creationary, protection range of the present utility model all should be belonged to.
Claims (8)
1. the NFC mobile phone Circuits System based on Adaptive matching circuit, comprise the NFC chip circuit, filter circuit, match circuit and the antenna circuit that connect successively, described NFC chip circuit is connected with described antenna circuit further, described NFC chip circuit comprises NFC chip, it is characterized in that: between described match circuit and antenna circuit, be connected with variable capacitance and current management control circuit further, the output of described variable capacitance and described match circuit is connected in parallel, and described current management control circuit is connected with described variable capacitance.
2., as claimed in claim 1 based on the NFC mobile phone Circuits System of Adaptive matching circuit, it is characterized in that: the capacitance value range of described variable capacitance is 1-20pf.
3. as claimed in claim 1 based on the NFC mobile phone Circuits System of Adaptive matching circuit, it is characterized in that: described filter circuit comprises the first inductance, second inductance, first electric capacity and the second electric capacity, the first end of described first inductance is connected with the first signal transmitting terminal of described NFC chip, second end of described first inductance is connected with the first end of described first electric capacity, the first end of described second inductance is connected with the secondary signal transmitting terminal of described NFC chip, second end of described second inductance is connected with the first end of described second electric capacity, be connected with ground wire further after second end of described first electric capacity is connected with the second end of described second electric capacity.
4. as claimed in claim 3 based on the NFC mobile phone Circuits System of Adaptive matching circuit, it is characterized in that: described match circuit comprises the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity and the 6th electric capacity, described 3rd electric capacity is connected between the first end of described first electric capacity and the first end of described 4th electric capacity, described 5th electric capacity is connected between the first end of described second electric capacity and the first end of described 6th electric capacity, the second end of described 4th electric capacity, is interconnected between the second end of described 6th electric capacity and the second end of described first electric capacity.
5. as claimed in claim 4 based on the NFC mobile phone Circuits System of Adaptive matching circuit, it is characterized in that: described antenna circuit comprises antenna and the first resistance, the second resistance, the first end of described first resistance is connected with the first end of described 4th electric capacity, second end of described first resistance is connected with the first end of described antenna, the first end of described second resistance is connected with the first end of described 6th electric capacity, and the second end of described second resistance is connected with the second end of described antenna.
6. as claimed in claim 5 based on the NFC mobile phone Circuits System of Adaptive matching circuit, it is characterized in that: described NFC chip circuit also comprises the 3rd resistance, the 4th resistance, the 7th electric capacity, the 8th electric capacity, between the first end that described 3rd resistance and described 7th capacitances in series are connected to described first electric capacity and the first signal receiving end of described NFC chip, between the first end that described 4th resistance and described 8th capacitances in series are connected to described second electric capacity and the secondary signal receiving terminal of described NFC chip.
7. as claimed in claim 5 based on the NFC mobile phone Circuits System of Adaptive matching circuit, it is characterized in that: described NFC chip circuit also comprises the 9th electric capacity and the tenth electric capacity, described 9th electric capacity is connected between the first end of described antenna and the first antenna input interface of described NFC chip, and described tenth electric capacity is connected between the second end of described antenna and the second antenna input interface of described NFC chip.
8. as claimed in claim 5 based on the NFC mobile phone Circuits System of Adaptive matching circuit, it is characterized in that: described NFC chip circuit also comprises the 11 electric capacity, described 11 electric capacity is connected between the internal reference voltage output end of described NFC chip and ground wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520065696.6U CN204408421U (en) | 2015-01-30 | 2015-01-30 | Based on the NFC mobile phone Circuits System of Adaptive matching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520065696.6U CN204408421U (en) | 2015-01-30 | 2015-01-30 | Based on the NFC mobile phone Circuits System of Adaptive matching circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204408421U true CN204408421U (en) | 2015-06-17 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520065696.6U Withdrawn - After Issue CN204408421U (en) | 2015-01-30 | 2015-01-30 | Based on the NFC mobile phone Circuits System of Adaptive matching circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204408421U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104580605A (en) * | 2015-01-30 | 2015-04-29 | 昆山睿翔讯通通信技术有限公司 | NFC (near field communication) cellphone circuit system based on self-adaptive matching circuit |
| CN116345727A (en) * | 2023-01-13 | 2023-06-27 | 荣耀终端有限公司 | Foreign matter detection method and related device |
-
2015
- 2015-01-30 CN CN201520065696.6U patent/CN204408421U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104580605A (en) * | 2015-01-30 | 2015-04-29 | 昆山睿翔讯通通信技术有限公司 | NFC (near field communication) cellphone circuit system based on self-adaptive matching circuit |
| CN104580605B (en) * | 2015-01-30 | 2017-11-14 | 昆山睿翔讯通通信技术有限公司 | NFC mobile phone circuit system based on Adaptive matching circuit |
| CN116345727A (en) * | 2023-01-13 | 2023-06-27 | 荣耀终端有限公司 | Foreign matter detection method and related device |
| CN116345727B (en) * | 2023-01-13 | 2023-11-21 | 荣耀终端有限公司 | Foreign matter detection method and related device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150617 Effective date of abandoning: 20171114 |