CN202093535U - Low frequency card read-write device - Google Patents
Low frequency card read-write device Download PDFInfo
- Publication number
- CN202093535U CN202093535U CN2011201568682U CN201120156868U CN202093535U CN 202093535 U CN202093535 U CN 202093535U CN 2011201568682 U CN2011201568682 U CN 2011201568682U CN 201120156868 U CN201120156868 U CN 201120156868U CN 202093535 U CN202093535 U CN 202093535U
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- circuit
- frequency card
- signal
- low frequency
- antenna
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Abstract
The utility model discloses a low frequency card read-write device, characterized in comprising discrete components: a one-chip microcomputer (1), a power amplification circuit (2), an antenna (3), a demodulation circuit (5) and an amplification and rectification circuit (6). The discrete components are used for realizing low frequency card reading and writing. The low frequency card read-write device not only is superior in performance, low in failure rate, and capable of stably working with a low voltage, but also has he advantages of simple circuit and low cost.
Description
Technical field
The utility model relates to a kind of low frequency card read-write equipment, relates in particular to a kind of low frequency card read-write equipment that is used for the instrument end.
Background technology
(Radio Frequency Identification is to utilize electromagnetic induction to be transmission means RFID) to radio frequency identification, finishes contactless two-way communication, obtains a kind of automatic identification technology of related data.Need not manual intervention when this technology is finished identification work, easily be automated and not fragile, swift and convenient to operate, obtained socially using widely.Some card reader that exist all need special-purpose Card Reader chip as the base station, but the cost of this card reader are higher at present.
The utility model content
The purpose of this utility model is, a kind of low frequency card read-write equipment is provided.It is simple in structure, and cost is lower, superior performance, and failure rate is low.
The technical solution of the utility model: a kind of low frequency card read-write equipment, it is characterized in that, comprise discrete component:
Single-chip microcomputer is used to launch carrier signal;
Power amplification circuit is used to amplify the carrier signal that single-chip microcomputer sends;
Antenna is used to launch the carrier signal after the amplification, the signal that the induction radio-frequency card produces;
Detecting circuit is used to detect the signal that antenna induction arrives;
Amplification and rectification circuit is used for the detected signal of detecting circuit is amplified shaping, and delivers to single-chip microcomputer and decode.
In the aforesaid low frequency card read-write equipment, described antenna is provided with resonant capacitance, is used to make antenna to obtain maximum current.
In the aforesaid low frequency card read-write equipment, described detecting circuit comprises:
Envelope detection circuit is used for the reception carrier signal, extracts useful data-signal;
Filtering circuit is used for filtering interference signals, and unusual fluctuations;
Holding circuit is used to protect back-end circuit, prevents from that voltage is excessive the back amplifying circuit is caused damage; Adopt two forward and reverse clampers of diode.
In the aforesaid low frequency card read-write equipment, described holding circuit comprises the diode of two forward and reverse clampers.
Compared with prior art, the utility model uses discrete component to realize the read-write of low frequency card.Superior performance not only, failure rate is low, can be on low voltage steady operation, and have that circuit is simple, low cost and other advantages.
Description of drawings
Fig. 1 is the circuit structure block diagram of the utility model embodiment;
Fig. 2 is a power amplification circuit schematic diagram among Fig. 1;
Fig. 3 is the detecting circuit schematic diagram;
Fig. 4 is the amplification and rectification circuit schematic diagram.
Being labeled as in the accompanying drawing:
The 1-single-chip microcomputer, 2-power amplification circuit, 3-antenna, 4-resonant capacitance, the 5-detecting circuit, 6-amplification and rectification circuit, 7-first resistance, 8-first triode, 9-second triode, 10-envelope detection circuit, 11-filtering circuit, 12-first diode, 13-second diode, 14-first operational amplifier, 15-second resistance, 16-the 3rd resistance, 17-electric capacity, 18-the 4th resistance, 19-the 5th resistance, 20-second operational amplifier.
Embodiment
Below in conjunction with drawings and Examples the utility model is further described, but not as the foundation to the utility model restriction.
Embodiment.A kind of low frequency card read-write equipment as shown in Figure 1, comprises discrete component:
Single-chip microcomputer 1 is used to launch carrier signal;
Detecting circuit 5 is used to detect the signal that antenna induction arrives;
Amplification and rectification circuit 6 is used for detecting circuit 5 detected signals are amplified shaping, and delivers to single-chip microcomputer 1 and decode.
Described antenna is provided with resonant capacitance 4, is used to make antenna 3 to obtain maximum current.
Described detecting circuit 5 comprises:
Envelope detection circuit is used for the reception carrier signal, extracts useful data-signal;
Filtering circuit is used for filtering interference signals, and unusual fluctuations;
Holding circuit is used to protect back-end circuit, prevents from that voltage is excessive the back amplifying circuit is caused damage; Adopt two forward and reverse clampers of diode, described holding circuit comprises the diode of two forward and reverse clampers.
During work, single-chip microcomputer 1 sends out the 125kHz carrier signal, is launched by antenna 3 after power amplification, and the signal that the radio-frequency card induction produces returns single-chip microcomputer 1 and decodes after the shaping processing is amplified in detection, filtering.Resonant capacitance 4, effect are to make to obtain maximum electric current on the antenna.
In Fig. 2, first resistance 7 is a current-limiting resistance, and first triode 8 and second triode 9 are formed the push-pull type power amplification circuit.The signal of single-chip microcomputer 1 output is launched by antenna 3 after amplifying.
In Fig. 3; the signal that antenna 3 inductions produce is at first removed carrier signal through envelope detection circuit 10; extract useful data-signal; remove by substantial low pass filtering circuit 11 then and disturb and unusual fluctuations, export to amplification and rectification circuit 6 by the holding circuit that first diode 12 and second diode 13 are formed.
In Fig. 4, the signal that detecting circuit 5 is handled well is input to first operational amplifier 14, second resistance 1) and the amplifying circuit formed of the 3rd resistance 16 amplify, be coupled to the voltage comparator circuit shaping that second operational amplifier 20 and the 4th resistance 18, the 5th resistance 19 are formed by electric capacity 17 subsequently, the timer that analog signal conversion becomes digital signal to be input to single-chip microcomputer after the shaping is caught pin, and single-chip microcomputer is finished the decoding of signal.
Claims (3)
1. a low frequency card read-write equipment is characterized in that, comprises discrete component:
Single-chip microcomputer (1) is used to launch carrier signal;
Power amplification circuit (2) is used to amplify the carrier signal that single-chip microcomputer (1) sends;
Antenna (3) is used to launch the carrier signal after the amplification, the signal that the induction radio-frequency card produces;
Detecting circuit (5) is used to detect the signal that antenna induction arrives;
Amplification and rectification circuit (6) is used for the detected signal of detecting circuit (5) is amplified shaping, and delivers to single-chip microcomputer (1) and decode.
2. low frequency card read-write equipment according to claim 1 is characterized in that: described antenna is provided with resonant capacitance (4), is used to make antenna (3) to obtain maximum current.
3. low frequency card read-write equipment according to claim 1 is characterized in that: described detecting circuit (5) comprising:
Envelope detection circuit (10) is used for the reception carrier signal, extracts useful data-signal;
Filtering circuit (11) is used for filtering interference signals, and unusual fluctuations;
Holding circuit is used to protect back-end circuit, prevents from that voltage is excessive the back amplifying circuit is caused damage; Described holding circuit comprises the diode of two forward and reverse clampers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201568682U CN202093535U (en) | 2011-05-17 | 2011-05-17 | Low frequency card read-write device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201568682U CN202093535U (en) | 2011-05-17 | 2011-05-17 | Low frequency card read-write device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202093535U true CN202093535U (en) | 2011-12-28 |
Family
ID=45368589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201568682U Expired - Lifetime CN202093535U (en) | 2011-05-17 | 2011-05-17 | Low frequency card read-write device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202093535U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103067103A (en) * | 2012-12-27 | 2013-04-24 | 昌辉汽车电气系统（安徽）有限公司 | Signal generator with self-diagnostic function |
| CN104376289A (en) * | 2014-12-08 | 2015-02-25 | 西安仓实电子科技有限公司 | Low-power-consumption-mode real-time contactless IC (integrated circuit) card monitoring and identifying method |
| CN104680198A (en) * | 2013-11-27 | 2015-06-03 | 哈尔滨市三和佳美科技发展有限公司 | Wireless radio frequency card reader |
| CN106059632A (en) * | 2016-05-25 | 2016-10-26 | 安徽汉威电子有限公司 | Carrier signal detection conversion circuit |
| WO2018218933A1 (en) * | 2017-05-31 | 2018-12-06 | 广州众诺电子技术有限公司 | Chip position-reset apparatus |
-
2011
- 2011-05-17 CN CN2011201568682U patent/CN202093535U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103067103A (en) * | 2012-12-27 | 2013-04-24 | 昌辉汽车电气系统（安徽）有限公司 | Signal generator with self-diagnostic function |
| CN104680198A (en) * | 2013-11-27 | 2015-06-03 | 哈尔滨市三和佳美科技发展有限公司 | Wireless radio frequency card reader |
| CN104376289A (en) * | 2014-12-08 | 2015-02-25 | 西安仓实电子科技有限公司 | Low-power-consumption-mode real-time contactless IC (integrated circuit) card monitoring and identifying method |
| CN106059632A (en) * | 2016-05-25 | 2016-10-26 | 安徽汉威电子有限公司 | Carrier signal detection conversion circuit |
| CN106059632B (en) * | 2016-05-25 | 2018-10-30 | 安徽汉威电子有限公司 | A kind of carrier signal tesing and switching circuit |
| WO2018218933A1 (en) * | 2017-05-31 | 2018-12-06 | 广州众诺电子技术有限公司 | Chip position-reset apparatus |
| WO2018218874A1 (en) * | 2017-05-31 | 2018-12-06 | 广州众诺电子技术有限公司 | Chip position-reset apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: LIERDA TECHNOLOGY GROUP CO., LTD. Free format text: FORMER NAME: LIERDA SCIENCE AND TECHNOLOGY CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: 310011 Gongshu District, Hangzhou Province, harmony Road, building A, room 1201, room, 18 Patentee after: Lierda Science & Technology Group Co., Ltd. Address before: Lilda science and Technology Building No. 425 Hangzhou City, Zhejiang province Gongshu District Dengyun road 310011 14 floor Patentee before: Lierda Science and Technology Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111228 |