CN103956039B - A kind of Far-infrared communication circuit with hardware transmitting-receiving self control function - Google Patents
A kind of Far-infrared communication circuit with hardware transmitting-receiving self control function Download PDFInfo
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- CN103956039B CN103956039B CN201410133232.4A CN201410133232A CN103956039B CN 103956039 B CN103956039 B CN 103956039B CN 201410133232 A CN201410133232 A CN 201410133232A CN 103956039 B CN103956039 B CN 103956039B
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Abstract
The invention discloses a kind of Far-infrared communication circuit with hardware transmitting-receiving self control function, including: 38K carrier generating circuit, signal coupling circuit, infrared signal transmission circuit, infrared signal receiving circuit and transmitting-receiving are from control circuit, the input of wherein said signal coupling circuit accesses a TXD holding wire, and outfan is respectively electrically connected to 38K carrier generating circuit and transmitting-receiving from control circuit；Described 38K carrier generating circuit is electrically connected to infrared signal transmission circuit；The outfan of described infrared signal receiving circuit accesses a RXD holding wire, and input is electrically connected to transmitting-receiving from control circuit.Circuit of the present invention is not required to additionally control and carrier signal, directly launch with Transistor-Transistor Logic level and receive infrared data, circuit is simple and reliable, has higher cost performance and versatility, is suitably applied computer, palm machine, Single Chip Microcomputer (SCM) system etc. and is directly connected to the application of Far-infrared communication interface.
Description
The present invention is to be 201210407261.6 based on China Patent No. filed in 23 days October in 2012, name
It is referred to as the divisional application of " a kind of Far-infrared communication circuit with hardware transmitting-receiving self control function ", this application
Partial content in description is to be incorporated herein by reference.
Technical field
The invention mainly relates to a kind of far infrared meter reading communication circuit being applied between ammeter, computer, palm machine.
Background technology
Far-infrared communication is widely used in the radio meter register application of portable equipment and computer and ammeter.Because
The signal band 38K carrier modulation of far infrared transmission, and it is big to launch power, and during transmitting, receiving terminal can synchronize to receive
The infrared signal launched to oneself, shines into data blocking, it is therefore desirable to increase a piece of single-chip microcomputer to produce 38K
Carrier wave and transmitting-receiving judge to control, and add cost and software work amount, and transmitting-receiving controls to be sentenced by scm software
Break and reduce system reliability.
Summary of the invention
Present invention seek to address that the defect that prior art exists, design one are applied to ammeter, computer, palm machine
Between far infrared meter reading communication circuit, including 38K carrier wave generation module, signal coupling module, infrared letter
Number transmitter module, IR signal reception module, transmitting-receiving is from control module.This circuit is satisfied, and (the China people are altogether
With state power industry standard DL/T645-2007) for the requirement of Far-infrared communication physical layer.This circuit makes
Completing carrier wave with 1 not circuit 74HC14 to occur, signal is modulated, and transmitting-receiving is from controlling, with general T TL
Level is directly connected to.It is suitably applied computer, palm machine, Single Chip Microcomputer (SCM) system etc. to be directly connected to Far-infrared communication and connect
The application of mouth.This circuit is not required to additionally control and carrier signal, directly launches with Transistor-Transistor Logic level and receives infrared
Data, circuit is simple and reliable, has higher cost performance and versatility.
In order to realize above-mentioned purpose of design, technical scheme 1, design one is applicable to ammeter, hand-held
Far-infrared communication circuit on machine or computer equipment, use signal coupling circuit, infrared signal transmission circuit and
Transmitting-receiving is from control circuit, it is achieved apply the direct Far-infrared communication of ammeter, PDA device etc..
Technical scheme 1: the Far-infrared communication circuit with hardware transmitting-receiving self control function includes: 38K
Carrier generating circuit, signal coupling circuit, infrared signal transmission circuit, infrared signal receiving circuit and receipts
From control circuit, the input of wherein said signal coupling circuit accesses a TXD holding wire, outfan
It is respectively electrically connected to 38K carrier generating circuit and transmitting-receiving from control circuit；Described 38K carrier generating circuit electricity
It is connected to infrared signal transmission circuit；The outfan of described infrared signal receiving circuit accesses a RXD signal
Line, input is electrically connected to transmitting-receiving from control circuit.
Further, in a preferred embodiment of the invention, described 38K carrier generating circuit is by the first electricity
Resistance, the 5th resistance, the first electric capacity, the second electric capacity, 38K crystal oscillator unit Y1 and non-gate cell U1A composition,
Wherein said 5th resistance R5 is starting of oscillation resistance so that non-gate cell U1A the most reversely starts vibration, from
And making the frequency of oscillation after its starting of oscillation and 38K crystal oscillator unit Y1 that resonance to occur so that final frequency of oscillation is
38K；Described first resistance R1 is impedance matching resistor, in order to improve the vibration of described 38K crystal oscillator unit Y1
Intensity；Described electric capacity C1, C2 are resonant capacitance, in order to improve the vibrational stabilization of described 38K crystal oscillator unit Y1
Property and reliability.
Further, in a preferred embodiment of the invention, described signal coupling circuit be by the second resistance R2,
3rd diode D3, non-gate cell U1B, U1C composition, described non-gate cell U1C accesses a TXD further
Holding wire.
Further, in a preferred embodiment of the invention, described infrared signal transmission circuit is by the 4th electricity
Resistance R4, the 8th resistance R8, the first audion Q1, infrared-emitting diode D1 composition.
Further, in a preferred embodiment of the invention, under normal conditions, described TXD holding wire is high electricity
Flat, non-gate cell U1C output low level, by non-gate cell U1B input signal after the 3rd diode D3
Being pulled to low level, described non-gate cell U1B output high level makes Q1 end, now the first diode D1
Do not send infrared signal；When TXD holding wire launches low level signal, non-gate cell U1C is output as high electricity
Flat so that the 3rd diode D3 cut-off, described 38K carrier generating circuit the 38K signal generated is through the
Two resistance R2 are transferred to non-gate cell U1B to export the TXD level signal of band 38K carrier signal；Band carrier wave
The TXD signal of signal controls conducting and the cut-off of the first audion Q1 by described 4th resistance R4, is leading
Time logical, electric current flows through the first audion Q1, infrared-emitting diode D1, the 8th resistance R8 to ground connection GND, red
Emission diode D1 produces infrared signal and launches, the first audion Q1 cut-off when cut-off, infrared
Penetrate diode D1 and do not launch infrared signal.
Further, in a preferred embodiment of the invention, described infrared signal receiving circuit is by the 3rd electricity
Resistance R3, the 7th resistance R7, the 4th electric capacity C4, far infrared receive one head U2 and non-gate cell U1D, U1E
Composition, wherein said 7th resistance R7 and the 4th electric capacity C4 composition one-level RC filter circuit receives to far infrared
Integrally head U2 powers, to improve its receiving sensitivity and interference free performance；Described far infrared receives one head U2
Receive after infrared signal by the 3rd resistance R3 through two grades of non-gate cell U1D, connect with RXD output after U1E
The collection of letters number.
Further, in a preferred embodiment of the invention, described transmitting-receiving from control circuit by the 6th resistance R6,
3rd electric capacity C3, the second diode D2, the 4th diode D4 and non-gate cell U1F composition.
Further, in a preferred embodiment of the invention, under normal conditions, when TXD holding wire does not launches signal
Second diode D2 keeps cut-off, and the input of non-gate cell U1F is high electricity by the 6th resistance R6 pull-up
Flat, non-gate cell U1F is output as low level, now D4 cut-off, and far infrared receives one head U2 and receives
Infrared signal can pass sequentially through the 3rd resistance R3, non-gate cell U1E, U1D exports RXD signal；When
When TXD holding wire launches signal, the second diode D2 is dragged down by low level, and non-gate cell U1C output becomes
Low level, U1F exports high level, and the 4th diode D4 conducting, the input of non-gate cell U1E is forced to set
For high level, far infrared receives one head U2 and can receive the TXD signal launched before oneself simultaneously, receives
One head U2 output is received from far infrared, because the 4th diode D4 is first after the TXD signal lag us level time
In U2 delay time, non-gate cell U1E input is pulled to high level so that RXD signal still keeps high level.
Further, in a preferred embodiment of the invention, the 6th resistance R6 and the 3rd electric capacity C3 composition one
Individual RC delay circuit, when TXD signal is high level, the 3rd electric capacity C3 is carried out slowly by the 6th resistance R6
Charging so that the input voltage of non-gate cell U1F slowly uprises；When TXD holding wire sends next low electricity
During ordinary mail, the 3rd electric capacity C3 is discharged by the second diode D2, described 6th resistance R6, the 3rd electric capacity C3
Re-establish the charging interval.
Further, in a preferred embodiment of the invention, the delay time of described RC delay circuit is more than remote
The delay time of infrared receiver one head U2 so that its RXD of self when sending data will not export all the time
The TXD signal of oneself, when TXD signal completes to send, waits when Chu Liwan data send data, and the 6th
Resistance R6 has been previously-completed charging to the 3rd electric capacity C3, non-gate cell U1F output low level, and now the 4th
Diode D4 ends.
Accompanying drawing explanation
The preferred embodiment of the present invention will be below by way of being embodied the most in detail, in figure
Identical function components/circuits with same-sign labelling in addition, therein
Fig. 1 is the circuit theory diagrams of the present invention.
Detailed description of the invention
With reference to Fig. 1, the preferred embodiment of Far-infrared communication circuit of the present invention includes: 38K carrier generating circuit 1,
Signal coupling circuit 2, infrared signal transmission circuit 3, infrared signal receiving circuit 4 and transmitting-receiving are from controlling electricity
Road 5, the input of wherein said signal coupling circuit 2 accesses a TXD holding wire, and outfan is electrically connected respectively
It is connected to 38K carrier generating circuit 1 and transmitting-receiving from control circuit 5；Described 38K carrier generating circuit 1 electrically connects
To infrared signal transmission circuit 3；The outfan of described infrared signal receiving circuit 4 accesses a RXD holding wire,
Input is electrically connected to transmitting-receiving from control circuit 5.
Further, in a preferred embodiment of the invention, described 38K carrier generating circuit 1 is by first
Resistance R1, the 5th resistance R5, the first electric capacity C1, the second electric capacity C2,38K crystal oscillator unit Y1 and not gate list
Unit's U1A composition, wherein said 5th resistance R5 is starting of oscillation resistance so that non-gate cell U1A is the most reverse
Start vibration, so that the frequency of oscillation after its starting of oscillation occurs resonance with 38K crystal oscillator unit Y1 so that final
Frequency of oscillation be 38K；Described first resistance R1 is impedance matching resistor, in order to improve described 38K crystal oscillator
The oscillation intensity of unit Y1；Described electric capacity C1, C2 are resonant capacitance, in order to improve described 38K crystal oscillator unit
The oscillatory stability of Y1 and reliability.
Further, in a preferred embodiment of the invention, described signal coupling circuit 2 is by the second resistance
R2, the 3rd diode D3, non-gate cell U1B, U1C composition, described non-gate cell U1C accesses one further
Individual TXD holding wire.
Further, in a preferred embodiment of the invention, described infrared signal transmission circuit 3 is by the 4th
Resistance R4, the 8th resistance R8, the first audion Q1, infrared-emitting diode D1 composition.
Further, in a preferred embodiment of the invention, under normal conditions, described TXD holding wire is high electricity
Flat, non-gate cell U1C output low level, by non-gate cell U1B input signal after the 3rd diode D3
Being pulled to low level, described non-gate cell U1B output high level makes Q1 end, now the first diode D1
Do not send infrared signal；When TXD holding wire launches low level signal, non-gate cell U1C is output as high electricity
Flat so that the 3rd diode D3 cut-off, described 38K carrier generating circuit 1 the 38K signal generated passes through
Second resistance R2 is transferred to non-gate cell U1B to export the TXD level signal of band 38K carrier signal；Band carries
The TXD signal of ripple signal controls conducting and the cut-off of the first audion Q1 by described 4th resistance R4,
During conducting, electric current flows through the first audion Q1, infrared-emitting diode D1, the 8th resistance R8 to ground connection GND,
Infrared-emitting diode D1 produces infrared signal and launches, and when cut-off, the first audion Q1 cut-off, infrared
Emitting diode D1 does not launch infrared signal.
Further, in a preferred embodiment of the invention, described infrared signal receiving circuit 4 is by the 3rd
Resistance R3, the 7th resistance R7, the 4th electric capacity C4, far infrared receive one head U2 and non-gate cell U1D, U1E
Composition, wherein said 7th resistance R7 and the 4th electric capacity C4 composition one-level RC filter circuit receives to far infrared
Integrally head U2 powers, to improve its receiving sensitivity and interference free performance；Described far infrared receives one head U2
Receive after infrared signal by the 3rd resistance R3 through two grades of non-gate cell U1D, connect with RXD output after U1E
The collection of letters number.
Further, in a preferred embodiment of the invention, described transmitting-receiving from control circuit 5 by the 6th resistance
R6, the 3rd electric capacity C3, the second diode D2, the 4th diode D4 and non-gate cell U1F composition.
Further, in a preferred embodiment of the invention, under normal conditions, when TXD holding wire does not launches signal
Second diode D2 keeps cut-off, and the input of non-gate cell U1F is high electricity by the 6th resistance R6 pull-up
Flat, non-gate cell U1F is output as low level, now D4 cut-off, and far infrared receives one head U2 and receives
Infrared signal can pass sequentially through the 3rd resistance R3, non-gate cell U1E, U1D exports RXD signal；When
When TXD holding wire launches signal, the second diode D2 is dragged down by low level, and non-gate cell U1C output becomes
Low level, U1F exports high level, and the 4th diode D4 conducting, the input of non-gate cell U1E is forced to set
For high level, far infrared receives one head U2 and can receive the TXD signal launched before oneself simultaneously, receives
One head U2 output is received from far infrared, because the 4th diode D4 is first after the TXD signal lag us level time
In U2 delay time, non-gate cell U1E input is pulled to high level so that RXD signal still keeps high level.
Further, in a preferred embodiment of the invention, the 6th resistance R6 and the 3rd electric capacity C3 composition one
Individual RC delay circuit, when TXD signal is high level, the 3rd electric capacity C3 is carried out slowly by the 6th resistance R6
Charging so that the input voltage of non-gate cell U1F slowly uprises；When TXD holding wire sends next low electricity
During ordinary mail, the 3rd electric capacity C3 is discharged by the second diode D2, described 6th resistance R6, the 3rd electric capacity C3
Re-establish the charging interval.
Further, in a preferred embodiment of the invention, the delay time of described RC delay circuit is more than remote
The delay time of infrared receiver one head U2 so that its RXD of self when sending data will not export all the time
The TXD signal of oneself, when TXD signal completes to send, waits when Chu Liwan data send data, and the 6th
Resistance R6 has been previously-completed charging to the 3rd electric capacity C3, non-gate cell U1F output low level, and now the 4th
Diode D4 ends.
These are only the preferred embodiment of the present invention, it is intended to embody prominent technique effect and the advantage of the present invention,
It it is not the restriction to technical scheme.Those skilled in the art will appreciate that all based on
Amendment, change or substitute technology feature done by the technology of the present invention content, all should be covered by the present invention
In the technology category that claims are advocated.
Claims (4)
1. a Far-infrared communication circuit with hardware transmitting-receiving self control function, including: 38K carrier generating circuit (1), signal coupling circuit (2), infrared signal transmission circuit (3), infrared signal receiving circuit (4) and transmitting-receiving are from control circuit (5), the input of wherein said signal coupling circuit (2) accesses a TXD holding wire, and outfan is respectively electrically connected to 38K carrier generating circuit (1) and transmitting-receiving from control circuit (5)；Described 38K carrier generating circuit (1) is electrically connected to infrared signal transmission circuit (3)；The outfan of described infrared signal receiving circuit (4) accesses a RXD holding wire, input is electrically connected to transmitting-receiving from control circuit (5), described infrared signal receiving circuit (4) is to be received one head U2 and non-gate cell U1D by the 3rd resistance R3, the 7th resistance R7, the 4th electric capacity C4, far infrared, U1E forms, wherein
Described 7th resistance R7 and the 4th electric capacity C4 composition one-level RC filter circuit receives one head U2 to far infrared and powers, to improve its receiving sensitivity and interference free performance；Described far infrared receives after one head U2 receives infrared signal and passes through the 3rd resistance R3 through two grades of non-gate cell U1D, signal is received with RXD output after U1E, it is characterized in that: described transmitting-receiving is made up of the 6th resistance R6, the 3rd electric capacity C3, the second diode D2, the 4th diode D4 and non-gate cell U1F from control circuit (5).
There is the Far-infrared communication circuit of hardware transmitting-receiving self control function the most as claimed in claim 1, it is characterized in that: under normal conditions, when TXD holding wire does not launches signal, the second diode D2 keeps cut-off, the input of non-gate cell U1F is high level by the 6th resistance R6 pull-up, non-gate cell U1F is output as low level, now D4 cut-off, far infrared receives the infrared signal that integrally head U2 receives and passes sequentially through the 3rd resistance R3, non-gate cell U1E, and U1D exports RXD signal；When TXD holding wire launches signal, second diode D2 is dragged down by low level, non-gate cell U1C output becomes low level, U1F exports high level, 4th diode D4 conducting, the input of non-gate cell U1E is forced to be set to high level, far infrared receives one head U2 and can receive the TXD signal launched before oneself simultaneously, one head U2 output is received from far infrared after the TXD signal lag us level time received, because non-gate cell U1E input is pulled to high level prior to U2 delay time by the 4th diode D4 so that RXD signal still keeps high level.
There is the Far-infrared communication circuit of hardware transmitting-receiving self control function the most as claimed in claim 2, it is characterized in that: the 6th resistance R6 and the 3rd electric capacity C3 forms a RC delay circuit, when TXD signal is high level, 3rd electric capacity C3 is slowly charged by the 6th resistance R6 so that the input voltage of non-gate cell U1F slowly uprises；When TXD holding wire sends next low level signal, the 3rd electric capacity C3 is discharged by the second diode D2, and described 6th resistance R6, the 3rd electric capacity C3 re-establish the charging interval.
There is the Far-infrared communication circuit of hardware transmitting-receiving self control function the most as claimed in claim 3, it is characterized in that: the delay time of described RC delay circuit receives the delay time of one head U2 more than far infrared, make its RXD of self when sending data will not export the TXD signal of oneself all the time, when TXD signal completes to send, etc. until Chu Liwan data send data time, 6th resistance R6 has been previously-completed charging to the 3rd electric capacity C3, non-gate cell U1F output low level, now the 4th diode D4 cut-off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410133232.4A CN103956039B (en) | 2012-10-23 | 2012-10-23 | A kind of Far-infrared communication circuit with hardware transmitting-receiving self control function |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210407261.6A CN102930709B (en) | 2012-10-23 | 2012-10-23 | Far-infrared communication circuit with hardware transmitting/receiving self-control function |
| CN201410133232.4A CN103956039B (en) | 2012-10-23 | 2012-10-23 | A kind of Far-infrared communication circuit with hardware transmitting-receiving self control function |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210407261.6A Division CN102930709B (en) | 2012-10-23 | 2012-10-23 | Far-infrared communication circuit with hardware transmitting/receiving self-control function |
Publications (2)
| Publication Number | Publication Date |
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| CN103956039A CN103956039A (en) | 2014-07-30 |
| CN103956039B true CN103956039B (en) | 2017-01-04 |
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| CN201410133232.4A Active CN103956039B (en) | 2012-10-23 | 2012-10-23 | A kind of Far-infrared communication circuit with hardware transmitting-receiving self control function |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110189514B (en) * | 2019-04-18 | 2021-07-13 | 广东满天星云信息技术有限公司 | Infrared carrier wave transparent transmission type communication circuit and device thereof |
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| CN200980065Y (en) * | 2006-12-15 | 2007-11-21 | 天津市爱维电子科技有限公司 | An infrared wall switch |
| CN101384034A (en) * | 2007-09-07 | 2009-03-11 | 宁波萨基姆波导研发有限公司 | Mobile phone with remote control function and remote control function processing method |
| CN201936413U (en) * | 2011-01-07 | 2011-08-17 | 华南理工大学 | Active infrared anti-theft alarm apparatus |
| JP2012103231A (en) * | 2010-11-15 | 2012-05-31 | Riken Keiki Co Ltd | Infrared gas detector |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007046636B4 (en) * | 2007-09-27 | 2011-05-05 | Lear Corporation Gmbh | Method and device for transmitting audio signals to the transmitting diodes of an audio signal infrared transmitting unit |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200980065Y (en) * | 2006-12-15 | 2007-11-21 | 天津市爱维电子科技有限公司 | An infrared wall switch |
| CN101384034A (en) * | 2007-09-07 | 2009-03-11 | 宁波萨基姆波导研发有限公司 | Mobile phone with remote control function and remote control function processing method |
| JP2012103231A (en) * | 2010-11-15 | 2012-05-31 | Riken Keiki Co Ltd | Infrared gas detector |
| CN201936413U (en) * | 2011-01-07 | 2011-08-17 | 华南理工大学 | Active infrared anti-theft alarm apparatus |
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