CN104598959A - Simple RFID load modulating circuit applied to computer accessory - Google Patents
Simple RFID load modulating circuit applied to computer accessory Download PDFInfo
- Publication number
- CN104598959A CN104598959A CN201310533917.3A CN201310533917A CN104598959A CN 104598959 A CN104598959 A CN 104598959A CN 201310533917 A CN201310533917 A CN 201310533917A CN 104598959 A CN104598959 A CN 104598959A
- Authority
- CN
- China
- Prior art keywords
- electric capacity
- diode
- resistance
- phase inverter
- telefault
- 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
Abstract
The invention discloses a simple RFID load modulating circuit applied to a computer accessory. The simple RFID load modulating circuit includes an alternating current power supply, a transformer, the computer accessory, an operational amplifier, a crystal oscillator wafer, a first phase inverter, a second phase inverter, a third phase inverter, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a first triode, a second triode, a first inductance coil, a second inductance coil, a third inductance coil, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor and a single chip microcomputer. The simple RFID load modulating circuit provided by the invention is fewer in used element, high in reliability, convenient to operate, simple in structure, easy to manufacture, low in production cost, and easy to popularize for use.
Description
Technical field
The present invention relates to a kind of RFID interlock circuit, particularly relate to one easy RFID load-modulate circuit on computer fittings
Background technology
RFID is also called " radio frequency certification ", " radio-frequency (RF) identification " or " non-contact IC card ", its purposes from the monthly ticket card of the mess card in dining room, bus, subway, citizen ID certificate to logistics management, vehicle pass-through management etc., more and more extensively.RFID employs three frequency ranges at present: 135kHz, 13.56MHz and 869MHz ~ 915MHz.First and second section is long wave and shortwave, operating distance very near (being limited by national standard); 3rd section is UHF, and operating distance farthest, can reach 10 meters.Because it is not easily copied, containing much information of storage, so progressively replace bar code to be attached on commodity in developed country.It also can be used to the installing card replacing some computer fittings in the future, is attached on computer fittings.As everyone knows, buy now a printer or one piece of video adapting card, obtain first to utilize in computer and install dish or by other approach install drivers, such computer could identify, the action of printer ability, TV programme just can receive.As all sticked RFID on the computer fittings newly bought in the future, video disc just need not be installed or find driver, directly inserting computer and just can use.
RFID load-modulate circuit of the prior art, circuit structure is complicated, and the electronic component of employing is many, and production cost is high, not easily makes.
Summary of the invention
Object of the present invention is just to provide one easy RFID load-modulate circuit on computer fittings to solve the problem.
The present invention is achieved through the following technical solutions above-mentioned purpose:
The present invention includes AC power, transformer, computer fittings, operational amplifier, crystal-vibration-chip, first phase inverter, second phase inverter, 3rd phase inverter, first diode, second diode, 3rd diode, 4th diode, 5th diode, 6th diode, first triode, second triode, first telefault, second telefault, 3rd telefault, first resistance, second resistance, 3rd resistance, 4th resistance, 5th resistance, first electric capacity, second electric capacity, 3rd electric capacity, 4th electric capacity, 5th electric capacity, 6th electric capacity, 7th electric capacity, 8th electric capacity, 9th electric capacity and single-chip microcomputer, the live wire of described AC power is connected with the first end of the first winding of described transformer, the zero line of described AC power is connected with the second end of described transformer first winding, the first end of described transformer second winding is connected with the positive pole of described 3rd diode and the negative pole of described 4th diode simultaneously, second end of described transformer secondary output winding is connected with the negative pole of described 5th diode and the positive pole of described 6th diode simultaneously, the first end of described first resistance is connected with the first end of described first electric capacity, the second end of described first resistance simultaneously with the first end of described second resistance, the inverting input of described operational amplifier is connected with the output terminal of described second triode, second end of described second resistance is connected with the negative pole of described first diode and the first end of described 4th electric capacity simultaneously, the first end of described 3rd resistance is connected with the base stage of described first triode, second end of described 3rd resistance is connected with the output terminal of described single-chip microcomputer, the first end of described 4th resistance is connected with the first end of described 3rd electric capacity, second end of described 4th resistance is connected with the second end of described 6th electric capacity and the base stage of described second triode simultaneously, with the normal phase input end of described first phase inverter while of the first end of described 5th resistance, the inverting input of described first phase inverter is connected with the output terminal of the first end of described crystal-vibration-chip with described second phase inverter, the second end of described 5th resistance simultaneously with the in-phase input end of described second phase inverter, the inverting input of described second phase inverter is connected with the first end of described 9th electric capacity, the first end of described 6th resistance is connected with the output terminal of described 3rd phase inverter and the second end of described 9th electric capacity simultaneously, with the input end in the same way of described 3rd phase inverter while of the second end of described 6th resistance, the described inverting input of the 3rd phase inverter is connected with the second end of described crystal-vibration-chip, second end of described first electric capacity is connected with the first end of described 3rd electric capacity and the first end of described first telefault simultaneously, with the first end of described second telefault while of the first end of described second electric capacity, the positive pole of described second diode is connected with the collector of described first triode, the second end of described second electric capacity simultaneously with the second end of described second telefault, the emitter of described first triode, the first end of described 5th electric capacity is connected with the first input end of described single-chip microcomputer, second end of described 4th electric capacity is connected with the in-phase input end of described operational amplifier, second end of described 5th electric capacity is connected with the negative pole of described second diode and the second input end of described single-chip microcomputer simultaneously, second end of described 6th electric capacity is connected with the output terminal of described first phase inverter, the first end of described 7th electric capacity is connected with the first end of described computer fittings, second end of described 7th electric capacity is connected with the output terminal of described operational amplifier, the first end of described 8th electric capacity simultaneously with the positive pole of described 5th diode, the positive pole of described 4th diode, the first end of described computer fittings, the power-of described operational amplifier is extremely extremely connected with the power-of described first phase inverter, the second end of described 8th electric capacity simultaneously with the negative pole of described 6th diode, the negative pole of described 3rd diode, the power positive end of described operational amplifier, the power positive end of described first phase inverter is connected with the first end of described 3rd telefault, the positive pole of described first diode is connected with the second end of described first telefault, and the second end of described 3rd telefault is connected with the collector of described second triode.
Beneficial effect of the present invention is:
The present invention is one easy RFID load-modulate circuit on computer fittings, and circuit uses element few, and reliability is high, easy to operate, and structure is simple, and be easy to make, production cost is low in addition, is easy to promote the use of.
Accompanying drawing explanation
Fig. 1 is circuit structure schematic diagram of the present invention;
Fig. 2 is principle of work block diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
As shown in Figure 1: the present invention includes AC power AC, transformer T, computer fittings PC, operational amplifier IC2, crystal-vibration-chip B, first phase inverter A1, second phase inverter A2, 3rd phase inverter A3, first diode VD1, second diode VD2, 3rd diode VD3, 4th diode VD4, 5th diode VD5, 6th diode VD6, first triode VT1, second triode VT2, first telefault L1, second telefault L2, 3rd telefault L3, first resistance R1, second resistance R2, 3rd resistance R3, 4th resistance R4, 5th resistance R5, 6th resistance R6, first electric capacity C1, second electric capacity C2, 3rd electric capacity C3, 4th electric capacity C4, 5th electric capacity C5, 6th electric capacity C6, 7th electric capacity C7, 8th electric capacity C8, 9th electric capacity C9 and single-chip microcomputer IC1, the live wire of AC power AC is connected with the first end of first winding of transformer T, the zero line of AC power AC is connected with the second end of transformer T first winding, the first end of transformer T second winding is connected with the positive pole of the 3rd diode VD3 and the negative pole of the 4th diode VD4 simultaneously, second end of transformer T secondary winding is connected with the negative pole of the 5th diode VD5 and the positive pole of the 6th diode VD6 simultaneously, the first end of the first resistance R1 is connected with the first end of the first electric capacity C1, second end of the first resistance R1 simultaneously with the first end of the second resistance R2, the inverting input of operational amplifier IC2 is connected with the output terminal of the second triode VT2, second end of the second resistance R2 is connected with the negative pole of the first diode VD1 and the first end of the 4th electric capacity C4 simultaneously, the first end of the 3rd resistance R3 is connected with the base stage of the first triode VT1, second end of the 3rd resistance R3 is connected with the output terminal of single-chip microcomputer, the first end of the 4th resistance R4 is connected with the first end of the 3rd electric capacity C3, second end of the 4th resistance R4 is connected with second end of the 6th electric capacity C6 and the base stage of the second triode VT2 simultaneously, with the normal phase input end of the first phase inverter A1 while of the first end of the 5th resistance R5, the inverting input of the first phase inverter A1 is connected with the output terminal of the first end of crystal-vibration-chip B with the second phase inverter A2, second end of the 5th resistance R5 simultaneously with the in-phase input end of the second phase inverter A2, the inverting input of the second phase inverter A2 is connected with the first end of the 9th electric capacity C9, the first end of the 6th resistance R6 is connected with the output terminal of the 3rd phase inverter A3 and second end of the 9th electric capacity C9 simultaneously, with the input end in the same way of the 3rd phase inverter A3 while of second end of the 6th resistance R6, the inverting input of the 3rd phase inverter A3 is connected with second end of crystal-vibration-chip B, second end of the first electric capacity C1 is connected with the first end of the 3rd electric capacity C3 and the first end of the first telefault L1 simultaneously, with the first end of the second telefault L2 while of the first end of the second electric capacity C2, the positive pole of the second diode VD2 is connected with the collector of the first triode VT1, second end of the second electric capacity C2 simultaneously with second end of the second telefault L2, the emitter of the first triode VT1, the first end of the 5th electric capacity C5 is connected with the first input end of single-chip microcomputer IC1, second end of the 4th electric capacity C4 is connected with the in-phase input end of operational amplifier IC2, second end of the 5th electric capacity C5 is connected with the negative pole of the second diode VD2 and second input end of single-chip microcomputer IC1 simultaneously, second end of the 6th electric capacity C6 is connected with the output terminal of the first phase inverter A1, the first end of the 7th electric capacity C7 is connected with the first end of computer fittings PC, second end of the 7th electric capacity C7 is connected with the output terminal of operational amplifier IC2, the first end of the 8th electric capacity C8 simultaneously with the positive pole of the 5th diode VD5, the positive pole of the 4th diode VD4, the first end of computer fittings PC, the power-of operational amplifier IC2 is extremely extremely connected with the power-of the first phase inverter A1, second end of the 8th electric capacity C8 simultaneously with the negative pole of the 6th diode VD6, the negative pole of the 3rd diode VD3, the power positive end of operational amplifier IC2, the power positive end of the first phase inverter A1 is connected with the first end of the 3rd telefault L3, and the positive pole of the first diode VD1 is connected with second end of the first telefault L1, and second end of the 3rd telefault L3 is connected with the collector of the second triode VT2.
As shown in Figure 2: the principle of work block diagram of RFID, known from block diagram, RFID is made up of two parts.Label is primarily of LC resonant tank and passive electronic switch composition.When label is when the first telefault L1 of card reader, due to the second telefault L2, the second electric capacity C2 loop starting of oscillation, now the energy of radio-frequency oscillator is absorbed, and the electric current flowing through the first resistance R1 reduces, and two ends pressure drop also decreases; If at this moment Closing Switch K1, causes short circuit, make the second telefault L2, the second electric capacity C2 loop off resonance, the energy of radio-frequency oscillator is not absorbed, and the electric current flowing through the first resistance R1 increases, and two ends pressure drop improves.As long as so ceaselessly Push switch K1, then pull-up resistor (the first resistance R1) two ends just obtain pulse train amplitude-modulated signal.Namely this signal recovers low frequency pulse signal through detection again.
As shown in Figure 1: the second phase inverter A2, the 3rd phase inverter A3 form crystal oscillator and work in 13.5MHz, its output is amplified through the first phase inverter A1 and the second triode VT2, stronger high frequency output electric current is by the 3rd electric capacity C3, flow through the antiresonant circuit of the first telefault L1, the first electric capacity C1 composition, and then flow through the first resistance R1, first resistance R1 two ends obtain the oscillator signal of constant amplitude, if this signal has extraneous load-modulate, can pulse amplitude modulation signal be produced, more namely recover low frequency pulse signal through the first diode VD1 detection.Pulse signal is coupled to operational amplifier IC2 through the 4th electric capacity C4 and is amplified, and output signal is to computer fittings PC.K switch 1 is changed into the first triode, has become noncontacting switch, only need input a faint pulse signal.Pulse signal produces with single-chip microcomputer IC originally because its operating voltage is low, power saving again, sound is not dull yet, output be pulse width modulated square wave.The power supply of single-chip microcomputer IC gets some energy from the second telefault L2, the second electric capacity C2 resonant tank, obtains, be stored in the 4th electric capacity C4 just enough through the first diode VD1 rectification.
Claims (1)
1. an easy RFID load-modulate circuit on computer fittings, is characterized in that: comprise AC power, transformer, computer fittings, operational amplifier, crystal-vibration-chip, first phase inverter, second phase inverter, 3rd phase inverter, first diode, second diode, 3rd diode, 4th diode, 5th diode, 6th diode, first triode, second triode, first telefault, second telefault, 3rd telefault, first resistance, second resistance, 3rd resistance, 4th resistance, 5th resistance, first electric capacity, second electric capacity, 3rd electric capacity, 4th electric capacity, 5th electric capacity, 6th electric capacity, 7th electric capacity, 8th electric capacity, 9th electric capacity and single-chip microcomputer, the live wire of described AC power is connected with the first end of the first winding of described transformer, the zero line of described AC power is connected with the second end of described transformer first winding, the first end of described transformer second winding is connected with the positive pole of described 3rd diode and the negative pole of described 4th diode simultaneously, second end of described transformer secondary output winding is connected with the negative pole of described 5th diode and the positive pole of described 6th diode simultaneously, the first end of described first resistance is connected with the first end of described first electric capacity, the second end of described first resistance simultaneously with the first end of described second resistance, the inverting input of described operational amplifier is connected with the output terminal of described second triode, second end of described second resistance is connected with the negative pole of described first diode and the first end of described 4th electric capacity simultaneously, the first end of described 3rd resistance is connected with the base stage of described first triode, second end of described 3rd resistance is connected with the output terminal of described single-chip microcomputer, the first end of described 4th resistance is connected with the first end of described 3rd electric capacity, second end of described 4th resistance is connected with the second end of described 6th electric capacity and the base stage of described second triode simultaneously, with the normal phase input end of described first phase inverter while of the first end of described 5th resistance, the inverting input of described first phase inverter is connected with the output terminal of the first end of described crystal-vibration-chip with described second phase inverter, the second end of described 5th resistance simultaneously with the in-phase input end of described second phase inverter, the inverting input of described second phase inverter is connected with the first end of described 9th electric capacity, the first end of described 6th resistance is connected with the output terminal of described 3rd phase inverter and the second end of described 9th electric capacity simultaneously, with the input end in the same way of described 3rd phase inverter while of the second end of described 6th resistance, the described inverting input of the 3rd phase inverter is connected with the second end of described crystal-vibration-chip, second end of described first electric capacity is connected with the first end of described 3rd electric capacity and the first end of described first telefault simultaneously, with the first end of described second telefault while of the first end of described second electric capacity, the positive pole of described second diode is connected with the collector of described first triode, the second end of described second electric capacity simultaneously with the second end of described second telefault, the emitter of described first triode, the first end of described 5th electric capacity is connected with the first input end of described single-chip microcomputer, second end of described 4th electric capacity is connected with the in-phase input end of described operational amplifier, second end of described 5th electric capacity is connected with the negative pole of described second diode and the second input end of described single-chip microcomputer simultaneously, second end of described 6th electric capacity is connected with the output terminal of described first phase inverter, the first end of described 7th electric capacity is connected with the first end of described computer fittings, second end of described 7th electric capacity is connected with the output terminal of described operational amplifier, the first end of described 8th electric capacity simultaneously with the positive pole of described 5th diode, the positive pole of described 4th diode, the first end of described computer fittings, the power-of described operational amplifier is extremely extremely connected with the power-of described first phase inverter, the second end of described 8th electric capacity simultaneously with the negative pole of described 6th diode, the negative pole of described 3rd diode, the power positive end of described operational amplifier, the power positive end of described first phase inverter is connected with the first end of described 3rd telefault, the positive pole of described first diode is connected with the second end of described first telefault, and the second end of described 3rd telefault is connected with the collector of described second triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310533917.3A CN104598959A (en) | 2013-11-01 | 2013-11-01 | Simple RFID load modulating circuit applied to computer accessory |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310533917.3A CN104598959A (en) | 2013-11-01 | 2013-11-01 | Simple RFID load modulating circuit applied to computer accessory |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104598959A true CN104598959A (en) | 2015-05-06 |
Family
ID=53124730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310533917.3A Pending CN104598959A (en) | 2013-11-01 | 2013-11-01 | Simple RFID load modulating circuit applied to computer accessory |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104598959A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108981975A (en) * | 2018-05-23 | 2018-12-11 | 北京航空航天大学 | A kind of pressure sensor and distribution force measuring method |
-
2013
- 2013-11-01 CN CN201310533917.3A patent/CN104598959A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108981975A (en) * | 2018-05-23 | 2018-12-11 | 北京航空航天大学 | A kind of pressure sensor and distribution force measuring method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201156257Y (en) | Data reading circuit for low frequency radio frequency IC card suitable for low voltage and corresponding apparatus | |
| CN104598959A (en) | Simple RFID load modulating circuit applied to computer accessory | |
| CN102184441B (en) | Radio frequency identification (RFID) tag chip demodulation circuit | |
| CN201741174U (en) | RFID electronic tag capable of being charged wirelessly | |
| CN206788878U (en) | A kind of contactless card reading circuits of low-power consumption 125KHz | |
| CN201387611Y (en) | Radio-frequency card reader-writer communication circuit | |
| CN201773278U (en) | Processing box chip | |
| CN213876801U (en) | Radio frequency identification label | |
| CN101706879B (en) | Uhf reader demodulation circuit | |
| CN201255885Y (en) | Non-contact radio frequency card reader | |
| CN100373392C (en) | Power supply processing interface in passive radio frequency identification system | |
| CN209132776U (en) | Novel non-contact high speed demodulator circuit | |
| CN203180825U (en) | Parallel-connection type crystal oscillator | |
| CN103870865A (en) | Radio frequency circuit used for non-contact IC card | |
| CN203689529U (en) | Wireless radio frequency card reader | |
| CN205680110U (en) | Electronic labelling system | |
| CN203324995U (en) | Low-power-consumption detecting device used for radio frequency card | |
| CN103926965B (en) | Automatic biasing constant current voltage stabilizing circuit | |
| CN204667413U (en) | Multi-functional RFID low frequency closely connects non-contact reader | |
| KR20040107265A (en) | Contactless type ic card reader with a power saving mode and reading method thereof | |
| CN102930237B (en) | The low frequency card reader arrangement of three kinds of modulation systems can be identified based on EM4095 | |
| CN209514641U (en) | A kind of radio frequency decoding circuit and decoding device | |
| CN203102323U (en) | Multi label multi protocol RFID reader | |
| CN201145902Y (en) | Detection circuit of radio frequency card for seeking card | |
| CN219761023U (en) | Wireless communication module |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150506 |