CN201163407Y - Card-seeking emission circuit of radio frequency card - Google Patents
Card-seeking emission circuit of radio frequency card Download PDFInfo
- Publication number
- CN201163407Y CN201163407Y CNU2008200821431U CN200820082143U CN201163407Y CN 201163407 Y CN201163407 Y CN 201163407Y CN U2008200821431 U CNU2008200821431 U CN U2008200821431U CN 200820082143 U CN200820082143 U CN 200820082143U CN 201163407 Y CN201163407 Y CN 201163407Y
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- card
- circuit
- radio frequency
- seeking
- frequency
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- 239000013078 crystal Substances 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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Abstract
The utility model relates to a 13.356MHz radiofrequency card card-finding transmitting circuit for a door entry, which comprises an antenna and a card-finding transmitting circuit, wherein the card-finding transmitting circuit consists of a matching network, an amplifying circuit, a frequency signal generator and a control circuit, a signal input end of the matching network is connected with the antenna, a signal output end of the matching network is connected with a signal input end of the amplifying circuit, one path of a signal output end of the amplifying circuit is connected with a signal input end of the control circuit, and one path of the signal output end of the amplifying circuit is connected with a signal input end of the frequency signal generator. The 13.356MHz radiofrequency card card-finding transmitting circuit has the advantages that: firstly, a 13.56MHz radiofrequency card card-finding device radiofrequency transmitting circuit is provided, which can decrease the design difficulty of a RFID radiofrequency signal transmitting circuit and the possibility of the realization, and can also reduce the whole cost of a system; secondly, the circuit is simple and has small energy consumption, and the transmitting power is easy to adjust; thirdly, the circuit has high card-finding accuracy, can not produce error actions, and has good stability.
Description
Technical field
The utility model relates to a kind of gate inhibition's of being used for 13.356MHz card-seeking emission circuit of radio frequency card, especially refers to the radio frequency amplitude modulated carrier radiating circuit in a kind of noncontact radio-frequency card read-write equipment, belongs to radio frequency card door lock and seeks card radiating circuit manufacturing field.
Background technology
13.56MHz the card detection circuit that noncontact radio-frequency card read-write equipment uses is generally to adopt the infrared external reflection mode.Its weak point: the one, be subjected to ambient light interference, easily produce misoperation; The 2nd, be subjected to the factor affecting such as shape, card face material of card bigger, its accuracy and poor stability; The 3rd, utilize the radio-frequency card base station ic directly to read radio-frequency card information and survey card, not only can increase the average power consumption of entire system, and reduce the serviceable life of system.
Summary of the invention
Purpose of design: avoid the weak point in the background technology, design that a kind of circuit is simple, energy consumption is little, seek the card-seeking emission circuit of radio frequency card of card accuracy height, good stability.
Design proposal: in order to realize above-mentioned purpose of design.The utility model is a simple and easy low-cost AM modulating system and a mission controller, wherein comprises a frequency signal generating means, in order to a stable radio frequency carrier frequency signal to be provided; One amplifying circuit is the transistor frequency-selecting amplifier, is connected in the frequency signal generating means, controlled by this frequency signal, according to the transmit power needs of setting and produce power; One matching network is connected in emitting antenna and amplifying circuit, is made up of bandpass filter, has filtering and impedance matching function, makes the energy of amplifier can effectively pass through transmission antennas transmit; One emitting antenna is connected in matching network, the emission carrier signal; And an ON-OFF control circuit, for radio-frequency (RF) transmitter provides electric energy, when radiating circuit is not worked, ON-OFF control circuit is closed, to reduce system power dissipation.On structural design, the utility model provides a kind of 13.56Mhz radio-frequency card to seek card device radio-frequency transmissions circuit, comprising: emitting antenna, matching network, amplifying circuit, frequency signal generating means, control circuit.1, emitting antenna can be shared with other dedicated RF ID read-write chip, reduces the system complex degree.2, matching network comprises bandpass filter, is used for the impedance matching between amplifying circuit and the emitting antenna, and signal energy is effectively launched by antenna.3, amplifying circuit is connected in the frequency signal generating means, provides energy according to required emissive power.This frequency of signal generator is used to produce the radio frequency carrier frequency of required work.4, ON-OFF control circuit is used to control the emission coefficient stand-by power consumption.Its technical scheme: card-seeking emission circuit of radio frequency card, its wraps antenna, seeks the card radiating circuit, the described card radiating circuit of seeking is made of matching network, amplifying circuit, frequency of signal generator and control circuit, the signal input part of matching network connects antenna, the signal output part of matching network connects the signal input part of amplifying circuit, and the signal input part, a tunnel of signal output part one road connection control circuit of amplifying circuit connects the signal input part of frequency signal generating circuit.
The utility model is compared with background technology, and the one, not only provide the 13.56Mhz radio-frequency card to seek card device radio-frequency transmissions circuit, can reduce the difficulty of RFID emission of radio frequency signals circuit design and the possibility of realization, can also reduce the whole cost of system; The 2nd, circuit is simple, emissive power is easy to adjust, energy consumption is little; The 3rd, seek card accuracy height, can not produce misoperation, good stability.
Description of drawings
Fig. 1 is the synoptic diagram that the radio frequency kayser is sought the card radiating circuit.
Fig. 2 is first kind of embodiment synoptic diagram that the radio frequency kayser is sought the card radiating circuit.
Fig. 3 is second kind of embodiment synoptic diagram that the radio frequency kayser is sought the card radiating circuit.
Fig. 4 is first kind of Application Example synoptic diagram that the radio frequency kayser is sought the card radiating circuit.
Fig. 5 is second kind of Application Example synoptic diagram that the radio frequency kayser is sought the card radiating circuit.
Embodiment
Embodiment 1: with reference to accompanying drawing 1～3.Card-seeking emission circuit of radio frequency card, it wraps antenna A, seeks the card radiating circuit, the described card radiating circuit of seeking is made of matching network B, amplifying circuit C, frequency of signal generator D and control circuit E, matching network is meant bandpass filtering, the signal input part of matching network B meets antenna A, and the signal output part of matching network B connects the signal input part of amplifying circuit C; Amplifying circuit is meant power tube, and the signal input part, a tunnel of signal output part one road connection control circuit E of amplifying circuit C connects the signal input part of frequency signal generating circuit D, and control circuit is meant that on-off circuit constitutes.Frequency of signal generator is made of resistance, reverser, crystal resonator and electric capacity overlap joint, and an end of its two electric capacity is connected with the two ends of crystal resonator, resistance and reverser respectively, the other end ground connection of two electric capacity; Or the radio frequency carrier frequency of required work is born, produced by MCU to frequency of signal generator by MCU.
Embodiment 2: with reference to accompanying drawing 4.On the basis of embodiment 1, card-seeking emission circuit of radio frequency card and card-seeking detection circuit of radio frequency card constitute the radio frequency card door lock of no reverser and seek the card circuit.
Embodiment 3: with reference to accompanying drawing 5.On the basis of embodiment 1, card-seeking emission circuit of radio frequency card and card-seeking detection circuit of radio frequency card constitute the radio frequency card door lock of reverser and seek the card circuit.
What need understand is: though the foregoing description is to the utility model detailed explanation of contrasting; but these explanations; just to simple declaration of the present utility model; rather than to restriction of the present utility model; any innovation and creation that do not exceed in the utility model connotation all fall in the protection domain of the present utility model.
Claims (6)
1, a kind of card-seeking emission circuit of radio frequency card, its wraps antenna, seeks the card radiating circuit, it is characterized in that: the described card radiating circuit of seeking is made of matching network, amplifying circuit, frequency of signal generator and control circuit, the signal input part of matching network connects antenna, the signal output part of matching network connects the signal input part of amplifying circuit, and the signal input part, a tunnel of signal output part one road connection control circuit of amplifying circuit connects the signal input part of frequency of signal generator.
2, card-seeking emission circuit of radio frequency card according to claim 1, it is characterized in that: matching network is meant bandpass filtering.
3, card-seeking emission circuit of radio frequency card according to claim 1, it is characterized in that: amplifying circuit is meant power tube.
4, card-seeking emission circuit of radio frequency card according to claim 1, it is characterized in that: control circuit is meant power switch circuit.
5, card-seeking emission circuit of radio frequency card according to claim 1, it is characterized in that: frequency of signal generator is made of resistance, reverser, crystal resonator and electric capacity overlap joint, one end of its two electric capacity is connected with the two ends of crystal resonator, resistance and reverser respectively, the other end ground connection of two electric capacity.
6, card-seeking emission circuit of radio frequency card according to claim 1 is characterized in that: the radio frequency carrier frequency of required work is born, produced by MCU to frequency of signal generator by MCU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200821431U CN201163407Y (en) | 2008-01-12 | 2008-01-12 | Card-seeking emission circuit of radio frequency card |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200821431U CN201163407Y (en) | 2008-01-12 | 2008-01-12 | Card-seeking emission circuit of radio frequency card |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201163407Y true CN201163407Y (en) | 2008-12-10 |
Family
ID=40184337
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200821431U Expired - Fee Related CN201163407Y (en) | 2008-01-12 | 2008-01-12 | Card-seeking emission circuit of radio frequency card |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201163407Y (en) |
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2008
- 2008-01-12 CN CNU2008200821431U patent/CN201163407Y/en not_active Expired - Fee Related
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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: HANGZHOU LIERDA TECHNOLOGY CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: 310011 Gongshu District, Hangzhou Province, the United States and the United States hospital A District, building 1201, room 18, room Patentee after: Lierda Science & Technology Group Co., Ltd. Address before: Hangzhou City, Zhejiang province 310011 Dengyun Road No. 425 Lilda building 14 floor Patentee before: Hangzhou Lierda Technology Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081210 Termination date: 20160112 |