CN103390147A - RFID card reader and method for providing clock source for RFID card reader - Google Patents
RFID card reader and method for providing clock source for RFID card reader Download PDFInfo
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- CN103390147A CN103390147A CN2012101428135A CN201210142813A CN103390147A CN 103390147 A CN103390147 A CN 103390147A CN 2012101428135 A CN2012101428135 A CN 2012101428135A CN 201210142813 A CN201210142813 A CN 201210142813A CN 103390147 A CN103390147 A CN 103390147A
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- rfid card
- oscillator
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Abstract
The technical scheme of the invention provides an RFID card reader and a method for providing a clock source for the RFID card reader. The RFID card reader comprises an emission unit, an approaching detecting unit and a first clock source. The emission unit is suitable for sending carrier waves, and the carrier waves form an electromagnetic field. The approaching detecting unit is suitable for identifying that an RFID card enters the electromagnetic field. The first clock source is suitable for serving as the clock source for the emission unit, and the first clock source comprises an RC oscillator or an LC oscillator. The RC oscillator or the LC oscillator is adopted to serve as the clock source of the emission source, approaching detection efficiency of the RFID card reader can be improved, and detecting time is saved. In addition, power consumption of the RC oscillator or the LC oscillator is lower, and the RC oscillator or the LC oscillator is utilized in the emission unit to serve as the clock source to enable power consumption in the whole working process to be reduced.
Description
Technical field
The present invention relates to radio frequency and set (RFID) field, particularly a kind of RFID card reader and the method that RFID card reader clock source is provided.
Background technology
The RFID card reader of tradition poll card seeking application, adopt crystal oscillator or PLL circuit to provide work clock to radiating circuit usually.Radiating circuit can carry out tentatively acknowledges requests, without correctly replying expression without sticking into field, have correctly to reply, represents to stick into field.When sticking into, radiating circuit continues periodically to send acknowledges requests; While sticking into, radiating circuit can carry out follow-up data communication.
It is long that crystal oscillator or PLL circuit generally have Induction Peried, or locking time is long, the large characteristics of work power consumption.Within most of time without sticking into field, utilize crystal oscillator or PLL circuit to carry out poll acknowledges requests at a slow speed as the clock source of radiating circuit, can sacrifice a large amount of card recognition times, the power consumption that waste produces without the card seeking under the card state in a large number.
Summary of the invention
Technical solution of the present invention solves is the high power problems that prior art adopts crystal oscillator or PLL circuit to produce as the clock source of RFID card reader radiating circuit.
Technical solution of the present invention provides a kind of RFID card reader, comprising: transmitter unit, march into the arena detecting unit and the first clock source;
Described transmitter unit is suitable for sending carrier wave, and described carrier wave forms electromagnetic field;
The described detecting unit of marching into the arena is suitable for identifying rfid card and enters described electromagnetic field;
Described the first clock source is suitable for the clock source as described transmitter unit, and described the first clock source comprises RC oscillator or LC oscillator.
Optionally, described transmitter unit also is suitable for after the described detecting unit of marching into the arena has recognized rfid card and enters described electromagnetic field, with Data Modulation to be sent to described carrier wave.
Optionally, described RFID card reader also comprises: second clock source and processing unit;
Described processing unit is suitable for when the described detecting unit of marching into the arena has recognized rfid card and enters described electromagnetic field, stop described the first clock source work, trigger the clock source of described second clock source as described transmitter unit, described second clock source comprises crystal oscillator or PLL circuit.
A kind of method of the RFID of providing card reader clock source also is provided technical solution of the present invention, comprising:
Transmitter unit sends carrier wave, and described carrier wave forms electromagnetic field;
The detecting unit of marching into the arena identification rfid card enters described electromagnetic field;
The first clock source is as the clock source of described transmitter unit, and described the first clock source comprises RC oscillator or LC oscillator.
Compared with prior art, technical solution of the present invention has the following advantages:
Technical solution of the present invention can adopt RC oscillator or the LC oscillator clock source as transmitter unit, can improve the RFID card reader the detection efficiency of marching into the arena, save detection time.And the power consumption of RC oscillator or LC oscillator is lower, and transmitter unit utilizes it as clock source, can reduce the power consumption of the whole course of work.
The transmitter unit of technical solution of the present invention can also enter electromagnetic field according to whether having recognized rfid card, adopt respectively different clock sources that work clock is provided, make transmitter unit improve work efficiency in the card seeking stage, reduce power consumption, guaranteed accuracy and the stability of data transmission procedure in the data communication stage.
Description of drawings
Fig. 1 is the structural representation of the embodiment one of RFID card reader of the present invention;
Fig. 2 is the structural representation of the embodiment two of RFID card reader of the present invention;
Fig. 3 is the structural representation of the embodiment three of RFID card reader of the present invention;
Fig. 4 is the embodiment process flow diagram that the invention provides the method for RFID card reader clock source.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.With way of example, the present invention is described more specifically with reference to accompanying drawing in the following passage.According to following explanation, advantages and features of the invention will be clearer.
As shown in Figure 1, the embodiment of the present invention one provides a kind of RFID card reader, comprising: transmitter unit 1, march into the arena detecting unit 2 and the first clock source 3.Described transmitter unit 1 is suitable for sending carrier wave, and described carrier wave forms electromagnetic field.The described detecting unit 2 of marching into the arena is suitable for identifying rfid card and enters described electromagnetic field.Described the first clock source 3 is suitable for the clock source as described transmitter unit 1, and described the first clock source comprises RC oscillator or LC oscillator.
Described transmitter unit 1 can also be after the described detecting unit 2 of marching into the arena have recognized rfid card and has entered described electromagnetic field, with Data Modulation to be sent to described carrier wave.
Described march into the arena detecting unit 2 can by detection receive or transmit path on signal intensity identification whether have rfid card to enter described electromagnetic field.
In the present embodiment, whether the detecting unit 2 of no matter marching into the arena has recognized rfid card enters described electromagnetic field, and described the first clock source 3 is transmitter unit 1 provides work clock.
The frequency of operation of the first clock source 3 can be by regulating resistance value and the capacitance of RC oscillator, and perhaps the inductance value of LC oscillator and capacitance are set.
The starting of oscillation speed of RC oscillator or LC oscillator is fast, utilizes the work clock of this class oscillator for transmitter unit, can improve the RFID card reader the detection efficiency of marching into the arena, save detection time.And the power consumption of RC oscillator or LC oscillator is lower, and transmitter unit utilizes it as clock source, can reduce the power consumption of the whole course of work.
As shown in Figure 2, the embodiment of the present invention two has increased second clock source 5 and processing unit 4 on embodiment one basis.Described processing unit 4 is suitable for when the described detecting unit 2 of marching into the arena has recognized rfid card and enters described electromagnetic field, stop described the first clock source 3 work, trigger described second clock source 5 and provide work clock for described transmitter unit 1, described second clock source 5 comprises crystal oscillator or PLL circuit.
In the present embodiment, whether recognized rfid card according to the detecting unit 2 of marching into the arena and entered described electromagnetic field, processing unit 4 is controlled different clock sources and is provided work clock for transmitter unit 1.Concrete, the detecting unit 2 of marching into the arena is unidentified when having rfid card to enter described electromagnetic field, and described the first clock source 3 provides work clock for transmitter unit 1; When the detecting unit 2 of marching into the arena had recognized rfid card and enters described electromagnetic field, processing unit 4 stopped described the first clock source 3 work, triggers described second clock source 5 and provides work clock for described transmitter unit 1.
Described processing unit 4 can comprise MCU.
The starting of oscillation speed of RC oscillator or LC oscillator is fast, low in energy consumption, uses it as transmitter unit 1, at the clock source in card seeking stage (detecting unit of marching into the arena is unidentified to there being rfid card to enter described electromagnetic field), can increase work efficiency, reduce power consumption.
Crystal oscillator or PLL circuit have accurate, the stable characteristics of oscillation frequency, use it as transmitter unit 1, at the clock source in data communication stage (detecting unit 2 of marching into the arena recognize rfid card enter described electromagnetic field after), can guarantee accuracy and the stability of subsequent data transmission process.
As shown in Figure 3, the RFID card reader that provides of the embodiment of the present invention three comprises: transmitter unit 1, the detecting unit 2 of marching into the arena, the first clock source 3, processing unit 4, second clock source 5, antenna element 6, receiving element 7 and coding and decoding unit 8.
Described transmitter unit 1, the detecting unit 2 of marching into the arena, the first clock source 3 and second clock source 5 can, with reference to above-described embodiment, repeat no more herein.
Antenna element 6 is suitable for sending or receiving the signal of communication of described RFID card reader.
Receiving element 7 is suitable for the signal that the described antenna element 6 of demodulation receives.
The mode of described modulation and demodulation can comprise: amplitude-shift keying (Amplitude Shift Keying, ASK), phase keying (Phase Shift Keying, PSK), frequency keying (Frequency Shift Keying, FSK) etc.
Coding and decoding unit 8 is suitable for the signal that transmitter unit 1 the sends processing of encode, to the processing of decoding of the signal of receiving element 7 transmissions.
In the present embodiment, the described detecting unit 2 of marching into the arena is connected with receiving element 7 with antenna element 6, enter described electromagnetic field by the signal intensity identification rfid card that detects on RX path, but should be understood that, in other embodiments, the detecting unit 2 of marching into the arena also can be connected with transmitter unit 1 with antenna element 6, by the signal intensity identification rfid card that detects on transmit path, enters described electromagnetic field.
Described receiving element 7 and coding and decoding unit 8 can not use clock source, also can with transmitter unit 1 common clock source.Namely, the clock source of receiving element 7 provides port to be connected with second clock source 5 with described the first clock source 3, the clock source of coding and decoding unit 8 provides port also with described the first clock source 3, with second clock source 5, to be connected, when switched in 4 pairs of the first clock sources 3 of processing unit and second clock source 5, the clock source of receiving element 7 and coding and decoding unit 8 also can change accordingly.
As shown in Figure 4, a kind of method of the RFID of providing card reader clock source also is provided in the present invention, comprising:
Step S1, transmitter unit sends carrier wave, and described carrier wave forms electromagnetic field;
Step S2, the detecting unit of marching into the arena identification rfid card enters described electromagnetic field;
Step S3, the first clock source are as the clock source of described transmitter unit, and described the first clock source comprises RC oscillator or LC oscillator.
The method of the described RFID of providing card reader clock source can also comprise: described transmitter unit after the described detecting unit of marching into the arena has recognized rfid card and has entered described electromagnetic field, with Data Modulation to be sent to described carrier wave.
The method of the described RFID of providing card reader clock source can also comprise: processing unit is when described detecting unit has recognized rfid card and entered described electromagnetic field, stop described the first clock source work, trigger the clock source of second clock source as described transmitter unit, described second clock source comprises crystal oscillator or PLL circuit.
The unit that relates in method about the RFID of providing card reader clock source provided by the invention, can describe with reference to the technical scheme of above-mentioned RFID card reader.
Although the present invention discloses as above with preferred embodiment, the present invention not is defined in this.Any those skilled in the art, without departing from the spirit and scope of the present invention, all can make various changes or modifications, so protection scope of the present invention should be with claim institute limited range.
Claims (6)
1. a RFID card reader, is characterized in that, comprising: transmitter unit, march into the arena detecting unit and the first clock source;
Described transmitter unit is suitable for sending carrier wave, and described carrier wave forms electromagnetic field;
The described detecting unit of marching into the arena is suitable for identifying rfid card and enters described electromagnetic field;
Described the first clock source is suitable for the clock source as described transmitter unit, and described the first clock source comprises RC oscillator or LC oscillator.
2. RFID card reader as claimed in claim 1, is characterized in that, described transmitter unit also is suitable for after the described detecting unit of marching into the arena has recognized rfid card and enters described electromagnetic field, with Data Modulation to be sent to described carrier wave.
3. RFID card reader as claimed in claim 2, is characterized in that, also comprises: second clock source and processing unit;
Described processing unit is suitable for when the described detecting unit of marching into the arena has recognized rfid card and enters described electromagnetic field, stop described the first clock source work, trigger the clock source of described second clock source as described transmitter unit, described second clock source comprises crystal oscillator or PLL circuit.
4. the method that RFID card reader clock source is provided, is characterized in that, comprising:
Transmitter unit sends carrier wave, and described carrier wave forms electromagnetic field;
The detecting unit of marching into the arena identification rfid card enters described electromagnetic field;
The first clock source is as the clock source of described transmitter unit, and described the first clock source comprises RC oscillator or LC oscillator.
5. the method that RFID card reader clock source is provided as claimed in claim 4, is characterized in that, also comprises: described transmitter unit after the described detecting unit of marching into the arena has recognized rfid card and has entered described electromagnetic field, with Data Modulation to be sent to described carrier wave.
6. the method that RFID card reader clock source is provided as claimed in claim 5, it is characterized in that, also comprise: processing unit is when described detecting unit has recognized rfid card and entered described electromagnetic field, stop described the first clock source work, trigger the clock source of second clock source as described transmitter unit, described second clock source comprises crystal oscillator or PLL circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101428135A CN103390147A (en) | 2012-05-09 | 2012-05-09 | RFID card reader and method for providing clock source for RFID card reader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2012101428135A CN103390147A (en) | 2012-05-09 | 2012-05-09 | RFID card reader and method for providing clock source for RFID card reader |
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| CN103390147A true CN103390147A (en) | 2013-11-13 |
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| CN2012101428135A Pending CN103390147A (en) | 2012-05-09 | 2012-05-09 | RFID card reader and method for providing clock source for RFID card reader |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6396045B1 (en) * | 1997-09-26 | 2002-05-28 | Qinetiq Limited | Sensor apparatus |
| CN101501707A (en) * | 2006-10-23 | 2009-08-05 | Lg伊诺特有限公司 | RF sensor system and method for operating the same |
| CN101517594A (en) * | 2006-09-25 | 2009-08-26 | 传感电子公司 | Method and system for standing wave detection for radio frequency identification marker readers |
-
2012
- 2012-05-09 CN CN2012101428135A patent/CN103390147A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6396045B1 (en) * | 1997-09-26 | 2002-05-28 | Qinetiq Limited | Sensor apparatus |
| CN101517594A (en) * | 2006-09-25 | 2009-08-26 | 传感电子公司 | Method and system for standing wave detection for radio frequency identification marker readers |
| CN101501707A (en) * | 2006-10-23 | 2009-08-05 | Lg伊诺特有限公司 | RF sensor system and method for operating the same |
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