CN101707501A - Infrared receiving circuit - Google Patents
Infrared receiving circuit Download PDFInfo
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- CN101707501A CN101707501A CN200910189790A CN200910189790A CN101707501A CN 101707501 A CN101707501 A CN 101707501A CN 200910189790 A CN200910189790 A CN 200910189790A CN 200910189790 A CN200910189790 A CN 200910189790A CN 101707501 A CN101707501 A CN 101707501A
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- infrared
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- inductance
- infrared receiving
- receiving circuit
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Abstract
The invention is applicable to the field of infrared jamming, and provides an infrared receiving circuit which comprises a filtering unit used for filtering infrared receiving signals received by an infrared receiver and then outputting the infrared receiving signals to a single chip microcomputer; the filtering unit further comprises a resistor, an inductor, a first energy storing/releasing element and a second energy storing/releasing element, wherein one end of the inductor is connected with the input end of the single chip microcomputer, and is grounded by the first energy storing/releasing element; and the other end of the inductor is connected with the output end of the infrared receiver by the resistor, and is grounded by the second energy storing/releasing element. The infrared receiving circuit filters the infrared receiving signals received by the infrared receiver by the filtering unit which consists of the resistor, the inductor, the first energy storing/releasing element and the second energy storing/releasing element, and outputs the infrared receiving signals to the single chip microcomputer, and prevents the infrared receiving signals providing for the single chip microcomputer from being interfered by high frequency infrared ray, and solves the problem of being interfered seriously by the high frequency infrared ray.
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, inductance, first store up/release and can store up/release the energy element by element and second; One end of described inductance is connected to the input of described single-chip microcomputer, and an end of described inductance also stores up/release energy element ground connection by described first; The other end of described inductance is connected to the output of described infrared remote receiver by described resistance, and the other end of described inductance also stores up/releases by described second can element ground connection.
Wherein, described first store up/release and to store up/to release and to be electric capacity by element by element and second.
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.
The infrared receiving circuit that the embodiment of the invention provides is exported to single-chip microcomputer by being stored up/released by resistance, inductance, first after can element and second storing up/release the infrared received signal filtering that the filter unit can element formed receives infrared remote receiver, make the infrared received signal offer single-chip microcomputer not have high frequency-infrared and disturb, be specially adapted to source impedance height, circuit that load impedance is high; 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 embodiments of the present invention, filter unit 2 further comprises: resistance R 1, inductance L 1, first are stored up/are released and can store up/release the energy element by element and second; Wherein, an end S1 of inductance L 1 is connected to the input 32 of single-chip microcomputer 3, and an end S1 of inductance L 1 also stores up/release energy element ground connection by first; The other end S2 of inductance L 1 is connected to the output 13 of infrared remote receiver 1 by resistance R 1, and the other end S2 of inductance L 1 also stores up/releases by second can element ground connection.
As one embodiment of the present of invention, first stores up/releases and can store up/release and can be capacitor C 2 by element by element for capacitor C 1, the second; Wherein, an end ground connection of capacitor C 1, the other end of capacitor C 1 is connected to the link S1 that inductance L 1 is connected with single-chip microcomputer 3; One end ground connection of capacitor C 2, the other end of capacitor C 2 is connected to the link S2 that inductance L 1 is connected with resistance R 1.
As one embodiment of the present of invention, the appearance value of capacitor C 1, capacitor C 2 all satisfies following computing formula: C=1/2RF ∏; Wherein, C is the appearance value of capacitor C 1, capacitor C 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 inductance value of inductance L 1 satisfies following computing formula: L=R/2F ∏; Wherein, L is the inductance value of inductance L 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 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 and capacitor C 1, C2 2, 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 of resistance R 1, inductance L 1 and capacitor C 1, C2 2, therefore 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, C2, the little filter high frequency of capacity; When voltage was dragged down by high level, capacitor C 2 was by resistance R 1, and the 3rd pin 13 of infrared remote receiver 1 discharges; When voltage changes suddenly, because capacitor C 2 has the accumulation of energy effect to produce electromotive force, resistance R 1 hinders the variation of electric current, capacitor C 2 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 ∏ type filter unit of being made up of resistance R 1, inductance L 1 and capacitor C 1, C2 goes for source impedance height, circuit that load impedance is high.
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.
The infrared receiving circuit that the embodiment of the invention provides is exported to single-chip microcomputer by being stored up/released by resistance, inductance, first after can element and second storing up/release the infrared received signal filtering that the filter unit can element formed receives infrared remote receiver, make the infrared received signal offer single-chip microcomputer not have high frequency-infrared and disturb, be specially adapted to source impedance height, circuit that load impedance is high; 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, inductance, first store up/release and can store up/release the energy element by element and second;
One end of described inductance is connected to the input of described single-chip microcomputer, and an end of described inductance also stores up/release energy element ground connection by described first; The other end of described inductance is connected to the output of described infrared remote receiver by described resistance, and the other end of described inductance also stores up/releases by described second can element ground connection.
2. infrared receiving circuit as claimed in claim 1 is characterized in that, described first stores up/release and can store up/release and can be electric capacity by element by element and second.
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 |
|---|---|---|---|
| CN200910189790A CN101707501A (en) | 2009-08-28 | 2009-08-28 | Infrared receiving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910189790A CN101707501A (en) | 2009-08-28 | 2009-08-28 | Infrared receiving circuit |
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| Publication Number | Publication Date |
|---|---|
| CN101707501A true CN101707501A (en) | 2010-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910189790A Pending CN101707501A (en) | 2009-08-28 | 2009-08-28 | Infrared receiving circuit |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2094164U (en) * | 1991-06-20 | 1992-01-22 | 北京电视技术研究所 | Agc frequency channel amplifier |
| CN1240886A (en) * | 1998-07-08 | 2000-01-12 | 高孟田 | Energy-saving efficient pump unit |
| CN1381127A (en) * | 2000-05-23 | 2002-11-20 | 二十一电力线公司 | High frequency network communication equipments over various lines |
| CN2621362Y (en) * | 2003-05-27 | 2004-06-23 | 广西民族学院 | Multi-frequency point information transmitting/receiving apparatus for group tour |
| CN2665948Y (en) * | 2003-09-25 | 2004-12-22 | 台塑讯科股份有限公司 | Pi band-pass filter |
| CN2914569Y (en) * | 2006-03-20 | 2007-06-20 | 蒲銮 | Infrared remote-control electronic ballast |
| CN101369806A (en) * | 2007-08-15 | 2009-02-18 | 台达电子工业股份有限公司 | Fan and fan system and its wave filter |
-
2009
- 2009-08-28 CN CN200910189790A patent/CN101707501A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2094164U (en) * | 1991-06-20 | 1992-01-22 | 北京电视技术研究所 | Agc frequency channel amplifier |
| CN1240886A (en) * | 1998-07-08 | 2000-01-12 | 高孟田 | Energy-saving efficient pump unit |
| CN1381127A (en) * | 2000-05-23 | 2002-11-20 | 二十一电力线公司 | High frequency network communication equipments over various lines |
| CN2621362Y (en) * | 2003-05-27 | 2004-06-23 | 广西民族学院 | Multi-frequency point information transmitting/receiving apparatus for group tour |
| CN2665948Y (en) * | 2003-09-25 | 2004-12-22 | 台塑讯科股份有限公司 | Pi band-pass filter |
| CN2914569Y (en) * | 2006-03-20 | 2007-06-20 | 蒲銮 | Infrared remote-control electronic ballast |
| CN101369806A (en) * | 2007-08-15 | 2009-02-18 | 台达电子工业股份有限公司 | Fan and fan system and its wave filter |
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Application publication date: 20100512 |