CN103956039A - Far-infrared communication circuit with hardware transmitting/receiving self-control function - Google Patents
Far-infrared communication circuit with hardware transmitting/receiving self-control function Download PDFInfo
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- CN103956039A CN103956039A CN201410133232.4A CN201410133232A CN103956039A CN 103956039 A CN103956039 A CN 103956039A CN 201410133232 A CN201410133232 A CN 201410133232A CN 103956039 A CN103956039 A CN 103956039A
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Abstract
The invention discloses a far-infrared communication circuit with a hardware transmitting/receiving self-control function. The far-infrared communication circuit comprises a 38K carrier generation circuit, a signal coupling circuit, an infrared signal transmitting circuit, an infrared signal receiving circuit and a transmitting/receiving self-control circuit, wherein the input end of the signal coupling circuit is connected to a transmit data (TXD) signal line, and the output end of the signal coupling circuit is respectively connected to the 38K carrier generation circuit and the transmitting/receiving self-control circuit; the 38K carrier generation circuit is electrically connected to the infrared signal transmitting circuit; ; and the output end of the infrared signal receiving circuit is connected to a receive data (RXD) signal line, and the input end of the infrared signal receiving circuit is electrically connected to the transmitting/receiving self-control circuit. Infrared data are directly transmitted and received according to transistor-transistor logic (TTL) level without additional control and carrier signals. The far-infrared communication circuit is simple and reliable, high in cost performance, high in generality, and applicable to direct connection of a far-infrared communication interface and systems such as a computer system, a palmtop system and a singlechip system.
Description
The present invention is that the China Patent No. based on application on October 23rd, 2012 is 201210407261.6, name is called dividing an application of " a kind of Far-infrared communication circuit with hardware transmitting-receiving self control function ", and the partial content in this application specification is to be incorporated herein by reference.
Technical field
The present invention relates generally 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 emissive power is large, during transmitting, receiving end can synchronously be received the infrared signal that oneself is launched, according to becoming data, stop up, therefore a slice single-chip microcomputer be need to increase and 38K carrier wave and transmitting-receiving judgement control produced, increased cost and software work amount, transmitting-receiving is controlled and is judged and reduced system reliability by scm software.
Summary of the invention
The present invention is intended to solve the defect that prior art exists, and designs a kind of far infrared meter reading communication circuit being applied between ammeter, computer, palm machine, comprising: 38K carrier wave generation module, signal coupling module, infrared signal transmitter module, infrared signal receiver module, transmitting-receiving is from control module.This circuit meets (the power industry standard DL/T645-2007 of the People's Republic of China (PRC)) for the requirement of Far-infrared communication Physical layer.This circuit is used 1 not circuit 74HC14 to complete carrier wave generation, signal modulation, and transmitting-receiving, from controlling, is directly connected with general T TL level.Be applicable to being applied to computer, palm machine, Single Chip Microcomputer (SCM) system etc. and directly connect the application of Far-infrared communication interface.This circuit does not need extra control and carrier signal, with Transistor-Transistor Logic level, directly transmits and receives infrared data, and circuit is simple and reliable, has higher cost performance and versatility.
In order to realize above-mentioned purpose of design, technical scheme 1 of the present invention, design a kind of Far-infrared communication circuit being applicable on ammeter, hand-held set or computer equipment, use signal coupling circuit, infrared signal transmission circuit and transmitting-receiving from control circuit, realize the direct Far-infrared communication application to ammeter, PDA equipment etc.
Technical scheme 1 of the present invention: the Far-infrared communication circuit with hardware transmitting-receiving self control function comprises: 38K carrier generating circuit, signal coupling circuit, infrared signal transmission circuit, infrared signal receiving circuit and transmitting-receiving are from control circuit, a TXD signal wire of input end access of wherein said signal coupling circuit, output terminal is electrically connected to respectively 38K carrier generating circuit and receives and dispatches from control circuit; Described 38K carrier generating circuit is electrically connected to infrared signal transmission circuit; A RXD signal wire of output terminal access of described infrared signal receiving circuit, input end is electrically connected to transmitting-receiving from control circuit.
Further, in a preferred embodiment of the invention, described 38K carrier generating circuit is comprised of the first resistance, the 5th resistance, the first electric capacity, the second electric capacity, 38K crystal oscillator unit Y1 and non-gate cell U1A, wherein said the 5th resistance R 5 is starting of oscillation resistance, make ceaselessly reverse starting oscillation of non-gate cell U1A, thereby make oscillation frequency and 38K crystal oscillator unit Y1 after its starting of oscillation that resonance occur, making final oscillation frequency is 38K; Described the first resistance R 1 is impedance matching resistance, in order to improve the oscillation intensity of described 38K crystal oscillator unit Y1; Described capacitor C 1, C2 is resonant capacitance, in order to improve oscillatory stability and the reliability of described 38K crystal oscillator unit Y1.
Further, in a preferred embodiment of the invention, described signal coupling circuit is by the second resistance R 2, the 3rd diode D3, non-gate cell U1B, and U1C forms, and described non-gate cell U1C is a TXD signal wire of access further.
Further, in a preferred embodiment of the invention, described infrared signal transmission circuit is comprised of the 4th resistance R 4, the 8th resistance R 8, the first triode Q1, infrared-emitting diode D1.
Further, in a preferred embodiment of the invention, under normal conditions, described TXD signal wire is high level, non-gate cell U1C output low level, after the 3rd diode D3, non-gate cell U1B input signal is pulled to low level, described non-gate cell U1B output high level makes Q1 cut-off, and now the first diode D1 does not send infrared signal; When TXD signal wire transmitting low level signal, non-gate cell U1C is output as high level, make the 3rd diode D3 cut-off, the 38K signal being generated by described 38K carrier generating circuit is passed to non-gate cell U1B to export the TXD level signal with 38K carrier signal through the second resistance R 2; TXD signal with carrier signal is controlled conducting and the cut-off of the first triode Q1 by described the 4th resistance R 4, when conducting, electric current flows through the first triode Q1, infrared-emitting diode D1, the 8th resistance R 8 to ground connection GND, infrared-emitting diode D1 produces infrared signal transmitting, the first triode Q1 cut-off when cut-off, infrared-emitting diode D1 does not launch infrared signal.
Further, in a preferred embodiment of the invention, described infrared signal receiving circuit is to receive an one U2 and non-gate cell U1D by the 3rd resistance R 3, the 7th resistance R 7, the 4th capacitor C 4, far infrared, U1E forms, wherein said the 7th resistance R 7 and the 4th capacitor C 4 form one-level RC filtering circuit and receive an one U2 power supply to far infrared, to improve its receiving sensitivity and interference free performance; Described far infrared receives after an one U2 receives infrared signal passes through the 3rd resistance R 3 through the non-gate cell U1D of secondary, after U1E, with RXD output, receives signal.
Further, in a preferred embodiment of the invention, described transmitting-receiving is comprised of the 6th resistance R 6, the 3rd capacitor C 3, the second diode D2, the 4th diode D4 and non-gate cell U1F from control circuit.
Further, in a preferred embodiment of the invention, under normal conditions, the second diode D2 remain off when TXD signal wire does not transmit, the input end of non-gate cell U1F is by drawing as high level in the 6th resistance R 6, and non-gate cell U1F is output as low level, now D4 cut-off, the infrared signal that a far infrared reception one U2 receives can be passed through the 3rd resistance R 3, non-gate cell U1E successively, U1D output RXD signal; When TXD signal wire transmits, the second diode D2 is dragged down by low level, non-gate cell U1C output becomes low level, U1F exports high level, the 4th diode D4 conducting, the input of non-gate cell U1E is forced to be made as high level, far infrared receives an one U2 and can receive the own TXD signal of transmitting before simultaneously, the TXD signal lag us level of receiving receives an one U2 output from far infrared after the time, because the 4th diode D4 is pulled to high level prior to U2 delay time by non-gate cell U1E input, make RXD signal still keep high level.
Further, in a preferred embodiment of the invention, the 6th resistance R 6 and the 3rd capacitor C 3 form a RC delay circuit, when TXD signal is high level, the 6th 6 pairs of resistance R the 3rd capacitor C 3 is slowly charged, and the input voltage of non-gate cell U1F is slowly uprised; When TXD signal wire sends next low level signal, the 3rd capacitor C 3 is discharged by the second diode D2, and described the 6th resistance R 6, the 3rd capacitor C 3 re-establish the duration of charging.
Further, in a preferred embodiment of the invention, the delay time of described RC delay circuit is greater than the delay time that far infrared receives an one U2, make its RXD of self when sending data can not export all the time the TXD signal of oneself, when TXD signal completes transmission, while waiting for that handling data sends data, the 6th 6 pairs of resistance R the 3rd capacitor C 3 completes charging in advance, non-gate cell U1F output low level, now the 4th diode D4 cut-off.
Accompanying drawing explanation
The preferred embodiment of the present invention will embody by the mode with reference to accompanying drawing in detail following, and the identical function components/circuits in figure is with same-sign mark in addition, wherein
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
With reference to Fig. 1, the preferred embodiment of Far-infrared communication circuit of the present invention comprises: 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, a TXD signal wire of input end access of wherein said signal coupling circuit 2, output terminal is electrically connected to respectively 38K carrier generating circuit 1 and receives and dispatches from control circuit 5; Described 38K carrier generating circuit 1 is electrically connected to infrared signal transmission circuit 3; A RXD signal wire of output terminal access of described infrared signal receiving circuit 4, input end 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 comprised of the first resistance R 1, the 5th resistance R 5, the first capacitor C 1, the second capacitor C 2,38K crystal oscillator unit Y1 and non-gate cell U1A, wherein said the 5th resistance R 5 is starting of oscillation resistance, make ceaselessly reverse starting oscillation of non-gate cell U1A, thereby make oscillation frequency and 38K crystal oscillator unit Y1 after its starting of oscillation that resonance occur, making final oscillation frequency is 38K; Described the first resistance R 1 is impedance matching resistance, in order to improve the oscillation intensity of described 38K crystal oscillator unit Y1; Described capacitor C 1, C2 is resonant capacitance, in order to improve oscillatory stability and the reliability of described 38K crystal oscillator unit Y1.
Further, in a preferred embodiment of the invention, described signal coupling circuit 2 is by the second resistance R 2, the 3rd diode D3, non-gate cell U1B, and U1C forms, and described non-gate cell U1C is a TXD signal wire of access further.
Further, in a preferred embodiment of the invention, described infrared signal transmission circuit 3 is comprised of the 4th resistance R 4, the 8th resistance R 8, the first triode Q1, infrared-emitting diode D1.
Further, in a preferred embodiment of the invention, under normal conditions, described TXD signal wire is high level, non-gate cell U1C output low level, after the 3rd diode D3, non-gate cell U1B input signal is pulled to low level, described non-gate cell U1B output high level makes Q1 cut-off, and now the first diode D1 does not send infrared signal; When TXD signal wire transmitting low level signal, non-gate cell U1C is output as high level, make the 3rd diode D3 cut-off, the 38K signal being generated by described 38K carrier generating circuit 1 is passed to non-gate cell U1B to export the TXD level signal with 38K carrier signal through the second resistance R 2; TXD signal with carrier signal is controlled conducting and the cut-off of the first triode Q1 by described the 4th resistance R 4, when conducting, electric current flows through the first triode Q1, infrared-emitting diode D1, the 8th resistance R 8 to ground connection GND, infrared-emitting diode D1 produces infrared signal transmitting, the first triode Q1 cut-off when 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 to receive an one U2 and non-gate cell U1D by the 3rd resistance R 3, the 7th resistance R 7, the 4th capacitor C 4, far infrared, U1E forms, wherein said the 7th resistance R 7 and the 4th capacitor C 4 form one-level RC filtering circuit and receive an one U2 power supply to far infrared, to improve its receiving sensitivity and interference free performance; Described far infrared receives after an one U2 receives infrared signal passes through the 3rd resistance R 3 through the non-gate cell U1D of secondary, after U1E, with RXD output, receives signal.
Further, in a preferred embodiment of the invention, described transmitting-receiving is comprised of the 6th resistance R 6, the 3rd capacitor C 3, the second diode D2, the 4th diode D4 and non-gate cell U1F from control circuit 5.
Further, in a preferred embodiment of the invention, under normal conditions, the second diode D2 remain off when TXD signal wire does not transmit, the input end of non-gate cell U1F is by drawing as high level in the 6th resistance R 6, and non-gate cell U1F is output as low level, now D4 cut-off, the infrared signal that a far infrared reception one U2 receives can be passed through the 3rd resistance R 3, non-gate cell U1E successively, U1D output RXD signal; When TXD signal wire transmits, the second diode D2 is dragged down by low level, non-gate cell U1C output becomes low level, U1F exports high level, the 4th diode D4 conducting, the input of non-gate cell U1E is forced to be made as high level, far infrared receives an one U2 and can receive the own TXD signal of transmitting before simultaneously, the TXD signal lag us level of receiving receives an one U2 output from far infrared after the time, because the 4th diode D4 is pulled to high level prior to U2 delay time by non-gate cell U1E input, make RXD signal still keep high level.
Further, in a preferred embodiment of the invention, the 6th resistance R 6 and the 3rd capacitor C 3 form a RC delay circuit, when TXD signal is high level, the 6th 6 pairs of resistance R the 3rd capacitor C 3 is slowly charged, and the input voltage of non-gate cell U1F is slowly uprised; When TXD signal wire sends next low level signal, the 3rd capacitor C 3 is discharged by the second diode D2, and described the 6th resistance R 6, the 3rd capacitor C 3 re-establish the duration of charging.
Further, in a preferred embodiment of the invention, the delay time of described RC delay circuit is greater than the delay time that far infrared receives an one U2, make its RXD of self when sending data can not export all the time the TXD signal of oneself, when TXD signal completes transmission, while waiting for that handling data sends data, the 6th 6 pairs of resistance R the 3rd capacitor C 3 completes charging in advance, non-gate cell U1F output low level, now the 4th diode D4 cut-off.
These are only the preferred embodiment of the present invention, be intended to embody outstanding technique effect of the present invention and advantage, is not the restriction to technical scheme of the present invention.Those skilled in the art will appreciate that all modifications of having done based on the technology of the present invention content, variation or substitute technology feature, all should be covered by the technology category of claims opinion of the present invention.
Claims (5)
1. one kind has the Far-infrared communication circuit that hardware is received and dispatched self control function, it is characterized in that comprising: 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), a TXD signal wire of input end access of wherein said signal coupling circuit (2), output terminal is electrically connected to respectively 38K carrier generating circuit (1) and receives and dispatches from control circuit (5); Described 38K carrier generating circuit (1) is electrically connected to infrared signal transmission circuit (3); A RXD signal wire of output terminal access of described infrared signal receiving circuit (4), input end is electrically connected to transmitting-receiving from control circuit (5), described infrared signal receiving circuit (4) is to receive an one U2 and non-gate cell U1D by the 3rd resistance R 3, the 7th resistance R 7, the 4th capacitor C 4, far infrared, U1E forms, wherein
Described the 7th resistance R 7 and the 4th capacitor C 4 form one-level RC filtering circuit and receive an one U2 power supply to far infrared, to improve its receiving sensitivity and interference free performance; Described far infrared receives after an one U2 receives infrared signal passes through the 3rd resistance R 3 through the non-gate cell U1D of secondary, after U1E, with RXD output, receives signal.
2. the Far-infrared communication circuit with hardware transmitting-receiving self control function as claimed in claim 1, it is characterized in that: described transmitting-receiving is comprised of the 6th resistance R 6, the 3rd capacitor C 3, the second diode D2, the 4th diode D4 and non-gate cell U1F from control circuit (5).
3. the Far-infrared communication circuit with hardware transmitting-receiving self control function as claimed in claim 2, it is characterized in that: under normal conditions, the second diode D2 remain off when TXD signal wire does not transmit, the input end of non-gate cell U1F is by drawing as high level in the 6th resistance R 6, non-gate cell U1F is output as low level, now D4 cut-off, the infrared signal that a far infrared reception one U2 receives can be passed through the 3rd resistance R 3, non-gate cell U1E successively, U1D output RXD signal; When TXD signal wire transmits, the second diode D2 is dragged down by low level, non-gate cell U1C output becomes low level, U1F exports high level, the 4th diode D4 conducting, the input of non-gate cell U1E is forced to be made as high level, far infrared receives an one U2 and can receive the own TXD signal of transmitting before simultaneously, the TXD signal lag us level of receiving receives an one U2 output from far infrared after the time, because the 4th diode D4 is pulled to high level prior to U2 delay time by non-gate cell U1E input, make RXD signal still keep high level.
4. the Far-infrared communication circuit with hardware transmitting-receiving self control function as claimed in claim 3, it is characterized in that: the 6th resistance R 6 and the 3rd capacitor C 3 form a RC delay circuit, when TXD signal is high level, the 6th 6 pairs of resistance R the 3rd capacitor C 3 is slowly charged, and the input voltage of non-gate cell U1F is slowly uprised; When TXD signal wire sends next low level signal, the 3rd capacitor C 3 is discharged by the second diode D2, and described the 6th resistance R 6, the 3rd capacitor C 3 re-establish the duration of charging.
5. the Far-infrared communication circuit with hardware transmitting-receiving self control function as described in claim 2 or 3 or 4, it is characterized in that: the delay time of described RC delay circuit is greater than the delay time that far infrared receives an one U2, make its RXD of self when sending data can not export all the time the TXD signal of oneself, when TXD signal completes transmission, when data transmission data are handled in wait, the 6th 6 pairs of resistance R the 3rd capacitor C 3 completes charging in advance, non-gate cell U1F output low level, now the 4th diode D4 cut-off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| 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 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210407261.6A Division CN102930709B (en) | 2012-10-23 | 2012-10-23 | Far-infrared communication circuit with hardware transmitting/receiving self-control function |
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| CN103956039A true CN103956039A (en) | 2014-07-30 |
| CN103956039B 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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Cited By (1)
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| CN110189514A (en) * | 2019-04-18 | 2019-08-30 | 广东满天星云信息技术有限公司 | A kind of infrared carrier wave transparent transmission formula telecommunication circuit and its device |
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| CN103956039B (en) | 2017-01-04 |
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