CN101710842A - Infrared receiver circuit - Google Patents
Infrared receiver circuit Download PDFInfo
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- CN101710842A CN101710842A CN200910189789A CN200910189789A CN101710842A CN 101710842 A CN101710842 A CN 101710842A CN 200910189789 A CN200910189789 A CN 200910189789A CN 200910189789 A CN200910189789 A CN 200910189789A CN 101710842 A CN101710842 A CN 101710842A
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- inductance
- infrared
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- pin
- infrared receiving
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Abstract
The invention is applicable to the infrared jamming field and provides an infrared receiver circuit. The circuit comprises a filtering unit used for filtering the infrared receiving signal received by the infrared receiver and then outputting the infrared receiving signal to the singlechip. The filtering unit further comprises a resistor, a first inductor, a second inductor and an energy storage/release component. The resistor, the first inductor and the second inductor are sequentially connected between the output end of an infrared receiver and the input end of a singlechip in series. One end of the energy storage/release component is grounded and the other end of the energy storage/release component is connected to the end where the first inductor is connected with the second inductor in series. The filtering unit composed of the resistor, the first inductor, the second inductor and the energy storage/release component filters the infrared receiving signal received by the infrared receiver and then outputs the infrared receiving signal to the singlechip, thus the infrared receiver circuit ensures the infrared receiving signal provided to the singlechip to be free from high frequency infrared jamming and solves the problem of being subjected to serious high frequency infrared jamming.
Description
Technical field
The invention belongs to infrared jamming field, relate in particular to a kind of infrared receiving circuit that can resist high frequency-infrared to disturb.
Background technology
In the existing infrared receiving circuit, the output of infrared remote receiver directly is connected with the input of single-chip microcomputer, if run into the high frequency-infrared electromagnetic interference, then can't get rid of; Infrared received signal is directly inputted to the input of single-chip microcomputer, can not resist high frequency-infrared to disturb, and is subjected to the high frequency-infrared interference effect serious, even influences and normally must receive sign indicating number work.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of infrared receiving circuit, is intended to solve the input that infrared received signal in the existing infrared receiving circuit is directly inputted to single-chip microcomputer and causes resisting high frequency-infrared to disturb, be subjected to the serious problem of high frequency-infrared interference effect.
The embodiment of the invention is achieved in that a kind of infrared receiving circuit, and it comprises single-chip microcomputer and infrared remote receiver; Described circuit also comprises the filter unit of exporting to described single-chip microcomputer after the infrared received signal filtering that is used for described infrared remote receiver is received; Described filter unit further comprises: resistance, first inductance, second inductance and storage/release can elements; Described resistance, described first inductance and described second inductance are connected between the input of the output of described infrared remote receiver and described single-chip microcomputer successively; Described storage/release can element an end ground connection, the other end that described storage/release can element is connected to the end that is connected in series of described first inductance and described second inductance.
Wherein, described storage/release can element be an electric capacity, an end ground connection of described electric capacity, and the other end of described electric capacity is connected to the end that is connected in series of described first inductance and described second inductance.
Wherein, the appearance value of described electric capacity satisfies following computing formula: C=1/2RF ∏; Wherein, C is the appearance value of described electric capacity; ∏ is 3.1415926; R is the resistance of load resistance; F is a cut-off frequency.
Wherein, the inductance value of described inductance satisfies following computing formula: L=R/2F ∏; Wherein, L is the inductance value of described inductance; ∏ is 3.1415926; R is the resistance of load resistance; F is a cut-off frequency.
Wherein, the resistance of described resistance is 10 kilohms.
Wherein, described infrared remote receiver comprises first pin, second pin and the 3rd pin; Described first pin is connected to power supply by current-limiting resistance, and described first pin is also by filter capacitor ground connection; The described second pin ground connection; Described the 3rd pin connects described filter unit.
Export to single-chip microcomputer after the infrared received signal filtering that the infrared receiving circuit that the embodiment of the invention provides receives infrared remote receiver by the filter unit can element by resistance, first inductance, second inductance and storage/release formed, make the infrared received signal that offers single-chip microcomputer not have high frequency-infrared and disturb, be specially adapted to the circuit that source impedance is low, load impedance is low; Solved the problem that is subjected to the high frequency-infrared serious interference.
Description of drawings
Fig. 1 is the circuit diagram of the infrared receiving circuit that provides of the embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Export to single-chip microcomputer after the infrared received signal filtering that the infrared receiving circuit that the embodiment of the invention provides receives infrared remote receiver by filter unit, make the infrared received signal that offers single-chip microcomputer not have high frequency-infrared and disturb, solved the problem that is subjected to the high frequency-infrared serious interference.
The infrared receiving circuit that the embodiment of the invention provides can be applied in the infrared interference of anti-electric ballast.Fig. 1 is the circuit diagram of the infrared receiving circuit that provides of the embodiment of the invention.For convenience of explanation, only show the part relevant with the embodiment of the invention, details are as follows.
Infrared receiving circuit comprises: infrared remote receiver 1, filter unit 2 and single-chip microcomputer 3; Wherein, filter unit 2 is connected between the input of the output of infrared remote receiver 1 and single-chip microcomputer 3; Export to single-chip microcomputer 3 after the infrared received signal filtering that filter unit 2 receives infrared remote receiver 1.
In fourth embodiment of the invention, filter unit 2 further comprises: resistance R 1, first inductance L 1, second inductance L 2 and store up/release can element; Wherein, resistance R 1, first inductance L 1 and second inductance L 2 are connected between the input of the output of infrared remote receiver 1 and single-chip microcomputer 3 successively; Store up/release an end ground connection of energy element, the other end that stores up/release the energy element is connected to the end S1 that is connected in series of first inductance L 1 and second inductance L 2.
As one embodiment of the present of invention, store up/release and can be capacitor C 1 by element, wherein, and an end ground connection of capacitor C 1, the other end of capacitor C 1 is connected to the end S1 that is connected in series of first inductance L 1 and second inductance L 2.
As one embodiment of the present of invention, the appearance value of capacitor C 1 satisfies following computing formula: C=1/2RF ∏; Wherein, C is the appearance value of capacitor C 1; ∏ is 3.1415926; R is the resistance of load resistance; F is a cut-off frequency.
As one embodiment of the present of invention, the inductance value of first inductance L 1, second inductance L 2 satisfies following computing formula: L=R/2F ∏; Wherein, L is the inductance value of first inductance L 1, second inductance L 2; ∏ is 3.1415926; R is the resistance of load resistance; F is a cut-off frequency.
As one embodiment of the present of invention, the resistance of resistance R 1 is 10 kilohms.
In embodiments of the present invention, infrared remote receiver 1 comprises first pin 11, second pin 12 and the 3rd pin 13; Wherein, first pin 11 is connected to power supply 4, the first pins 11 also by filter capacitor C2 ground connection by current-limiting resistance R2; Second pin, 12 ground connection; The 3rd pin 13 connects filter unit 2.
As one embodiment of the present of invention, the resistance of current-limiting resistance R2 is 100 ohm.
In embodiments of the present invention, single-chip microcomputer 3 comprises power end 31, input 32 and output 33, wherein power end 31 connects power supply 4, input 32 connects filter unit 2, output 33 connections are subjected to monolithic processor controlled circuit, owing to be connected the circuit of single-chip microcomputer 3 outputs 33 are prior aries and irrelevant with inventive point of the present invention, so be not described in detail in this.
For the infrared receiving circuit that illustrates that further the embodiment of the invention provides, existing in conjunction with Fig. 1 in detail the operation principle of the infrared receiving circuit that the embodiment of the invention provides to be described in detail as follows:
Infrared remote receiver 1 is the 3rd pin 13 output high level when not receiving infrared signal, and by being connected to the input 32 of single-chip microcomputer 3 behind the filter unit of being made up of resistance R 1, inductance L 1, L2 and capacitor C 12, the input 32 of single-chip microcomputer 3 receives high level; The high level of infrared remote receiver 1 the 3rd pin 13 outputs when receiving infrared signal is dragged down, because infrared signal is connected to the input 32 of single-chip microcomputer 3 by the filter unit of being made up of resistance R 1, inductance L 1, L2 and capacitor C 12, so the input 32 of single-chip microcomputer 3 receives low level.Wherein, the impedance of inductance L 1 raises along with frequency and increases, and therefore plays the effect that stops with loss for disturbance current; Since the big filter low frequency of capacity of capacitor C 1, the little filter high frequency of capacity; When voltage was dragged down by high level, capacitor C 1 was by the 3rd pin 13 discharges of inductance L 1, resistance R 1 and infrared remote receiver 1; When voltage changes suddenly, because capacitor C 1 has the accumulation of energy effect to produce electromotive force, resistance R 1 hinders the variation of electric current, capacitor C 1 is slowly discharged: when a very narrow pulse arrives, the time that capacitor C 1 is discharged can be maintained to next identical high level when arriving, the signal that enters single-chip microcomputer 3 inputs 32 by capacitor C 1 output S1 filters very narrow pulse like this, and have only wide pulse to pass through, wherein, the size of filtering cut-off frequency F depends on the amount of capacity of capacitor C.
In embodiments of the present invention, the T type filter unit of being made up of resistance R 1, inductance L 1, L2 and capacitor C 1 goes for the circuit that source impedance is low, load impedance is low.
As one embodiment of the present of invention, the components and parts number of filtering in the filter unit 2 can have a plurality of, and the components and parts number of filtering is many more, and the transition band of filter unit 2 is short more, suitable more interfering frequency and the approaching occasion of signal frequency.
Export to single-chip microcomputer after the infrared received signal filtering that the infrared receiving circuit that the embodiment of the invention provides receives infrared remote receiver by the filter unit can element by resistance, first inductance, second inductance and storage/release formed, make the infrared received signal that offers single-chip microcomputer not have high frequency-infrared and disturb, be specially adapted to the circuit that source impedance is low, load impedance is low; Solved the problem that is subjected to the high frequency-infrared serious interference.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. infrared receiving circuit, it comprises single-chip microcomputer and infrared remote receiver; It is characterized in that described circuit also comprises the filter unit of exporting to described single-chip microcomputer after the infrared received signal filtering that is used for described infrared remote receiver is received; Described filter unit further comprises: resistance, first inductance, second inductance and storage/release can elements;
Described resistance, described first inductance and described second inductance are connected between the input of the output of described infrared remote receiver and described single-chip microcomputer successively;
Described storage/release can element an end ground connection, the other end that described storage/release can element is connected to the end that is connected in series of described first inductance and described second inductance.
2. infrared receiving circuit as claimed in claim 1 is characterized in that, described storage/release can element be an electric capacity, an end ground connection of described electric capacity, and the other end of described electric capacity is connected to the end that is connected in series of described first inductance and described second inductance.
3. infrared receiving circuit as claimed in claim 2 is characterized in that, the appearance value of described electric capacity satisfies following computing formula: C=1/2RF ∏; Wherein, C is the appearance value of described electric capacity; ∏ is 3.1415926; R is the resistance of load resistance; F is a cut-off frequency.
4. infrared receiving circuit as claimed in claim 1 is characterized in that, the inductance value of described inductance satisfies following computing formula: L=R/2F ∏; Wherein, L is the inductance value of described inductance; ∏ is 3.1415926; R is the resistance of load resistance; F is a cut-off frequency.
5. infrared receiving circuit as claimed in claim 1 is characterized in that, the resistance of described resistance is 10 kilohms.
6. infrared receiving circuit as claimed in claim 1 is characterized in that, described infrared remote receiver comprises first pin, second pin and the 3rd pin; Described first pin is connected to power supply by current-limiting resistance, and described first pin is also by filter capacitor ground connection; The described second pin ground connection; Described the 3rd pin connects described filter unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910189789A CN101710842A (en) | 2009-08-28 | 2009-08-28 | Infrared receiver circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910189789A CN101710842A (en) | 2009-08-28 | 2009-08-28 | Infrared receiver circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101710842A true CN101710842A (en) | 2010-05-19 |
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ID=42403604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910189789A Pending CN101710842A (en) | 2009-08-28 | 2009-08-28 | Infrared receiver circuit |
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| Country | Link |
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| CN (1) | CN101710842A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102339168A (en) * | 2010-07-21 | 2012-02-01 | 北京汇冠新技术股份有限公司 | Touch screen and multi-channel sampling method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1111859A (en) * | 1994-10-07 | 1995-11-15 | 阮瀛洲 | High sensitivity infrared receiver |
| CN1381127A (en) * | 2000-05-23 | 2002-11-20 | 二十一电力线公司 | High frequency network communication equipments over various lines |
| CN2914569Y (en) * | 2006-03-20 | 2007-06-20 | 蒲銮 | Infrared remote-control electronic ballast |
-
2009
- 2009-08-28 CN CN200910189789A patent/CN101710842A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1111859A (en) * | 1994-10-07 | 1995-11-15 | 阮瀛洲 | High sensitivity infrared receiver |
| CN1381127A (en) * | 2000-05-23 | 2002-11-20 | 二十一电力线公司 | High frequency network communication equipments over various lines |
| CN2914569Y (en) * | 2006-03-20 | 2007-06-20 | 蒲銮 | Infrared remote-control electronic ballast |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102339168A (en) * | 2010-07-21 | 2012-02-01 | 北京汇冠新技术股份有限公司 | Touch screen and multi-channel sampling method thereof |
| CN102339168B (en) * | 2010-07-21 | 2013-10-16 | 北京汇冠新技术股份有限公司 | Touch screen and multi-channel sampling method thereof |
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Application publication date: 20100519 |