CN101801128A - Command marker lamp and LED control circuit thereof - Google Patents
Command marker lamp and LED control circuit thereof Download PDFInfo
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- CN101801128A CN101801128A CN201010042868A CN201010042868A CN101801128A CN 101801128 A CN101801128 A CN 101801128A CN 201010042868 A CN201010042868 A CN 201010042868A CN 201010042868 A CN201010042868 A CN 201010042868A CN 101801128 A CN101801128 A CN 101801128A
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Abstract
The invention relates to a command marker lamp and an LED control circuit thereof. In the LED control circuit, one end of a tact switch is connected with the anode of an output end of a power source, the other end thereof is grounded through a first pull-up resistor, a first input end of a single chip is connected with the other end of the tact switch, a first filter capacitor is arranged between the first input end of the single chip and the ground, a first output end of the single chip is connected with the cathode of an LED light source assembly respectively through a first switch tube and a first current-limiting resistor, and the anode of the LED light source assembly is connected with the anode of the output end of the power source. By implementing the technical scheme, the filter capacitor C1 can filter the interference signals; in addition, the first input end of the single chip U1 can judge whether the inputted signal is of an interference signal by delaying the waiting time after receiving the inputted signal, so the interference signal can be further filtered; and moreover, the LED control circuit has the advantages of reliability, low cost, simplicity, high efficiency and the like, and completely overcomes the defects that the interface of the single chip is easy to be interfered.
Description
Technical field
The present invention relates to lighting technical field, more particularly, relate to a kind of sign lamp and LED control circuit thereof.
Background technology
Continuous development along with science and technology, the new product new technology is constantly reformed, LED is as new type light source, it has energy-conservation, environmental protection, characteristics of high efficiency, technology is ripe and be applied to every field, various control circuits have also appearred thereupon, single-chip microcomputer is as a kind of intelligent control chip commonly used, extensively adopted by people, generally adopt lithium battery as power supply at present on the market, with the circuit of single-chip microcomputer as intelligent control method, single-chip microcomputer has power consumption little as intelligent control chip, simplicity of design, convenient, flexible advantage, there is its LED control circuit to have power consumption little equally, the efficient height, reliable and stable, advantage such as in light weight, but, make the single-chip microcomputer misoperation because the port of single-chip microcomputer is subjected to interference from outside signals easily, upset the normal operating conditions of LED, just brought very big inconvenience to the user.
Summary of the invention
The technical problem to be solved in the present invention is, is subject to the defective that outer signals is disturbed at the single-chip microcomputer of the above-mentioned LED control circuit of prior art, and a kind of anti-interference LED control circuit is provided.
The technical solution adopted for the present invention to solve the technical problems is: the LED control circuit of constructing a kind of command identifying lamp, comprise power supply, single-chip microcomputer, touch-switch, first pull-up resistor, first filter capacitor, first switching tube, first current-limiting resistance and led light source group, wherein, one end of described touch-switch connects the output head anode of power supply, the other end of described touch-switch is by the first pull-up resistor ground connection, the first input end of described single-chip microcomputer connects the described other end of described touch-switch, described first filter capacitor is connected between the first input end and ground of described single-chip microcomputer, first output of described single-chip microcomputer is successively by first switching tube, first current-limiting resistance connects the negative pole of described led light source group, and the positive pole of described led light source group connects the output head anode of power supply.
In LED control circuit of the present invention, described single-chip microcomputer comprises:
Delay unit is used for the input signal that described single-chip microcomputer (U1) first input end receives is delayed time;
Timing unit is used for timing one default delay time;
Judging unit, be used to judge whether the input signal that described single-chip microcomputer (U1) first input end receives exists, if exist, then described input signal is inputed to signal processing unit behind the described default delay time of time-delay, if do not exist, then do not respond described input signal;
Signal processing unit is used for the result according to described judging unit output, and output drive signal is luminous to control described led light source group.
In LED control circuit of the present invention, also comprise second filter capacitor that is used for filtering interference signals, described second filter capacitor is connected between the negative pole and ground of described led light source group.
In LED control circuit of the present invention, also comprise the second switch pipe and second current-limiting resistance, second output of described single-chip microcomputer connects the negative pole of described led light source group successively by the second switch pipe and second current-limiting resistance.
In LED control circuit of the present invention, also comprise the adjustable shunting a reference source of divider resistance and three ends, the 3rd output of described single-chip microcomputer connects second input of single-chip microcomputer by divider resistance, second input that the negative electrode of the adjustable shunting a reference source of described three ends and reference edge together connect single-chip microcomputer, its plus earth.
In LED control circuit of the present invention, described power supply is a lithium battery, and the positive pole of described lithium battery connects the power end of described single-chip microcomputer, and its negative pole connects the ground voltage terminal of single-chip microcomputer.
In LED control circuit of the present invention, also comprise oscillation resistance, described oscillation resistance is connected between the oscillator input and ground of described single-chip microcomputer.
In LED control circuit of the present invention, also comprise second pull-up resistor and reset capacitance, the output head anode of one termination power of described second pull-up resistor, its other end is by reset capacitance ground connection, and the reset terminal of described single-chip microcomputer connects the described other end of described second pull-up resistor.
In LED control circuit of the present invention, described led light source group is by a plurality of LED serial or parallel connections or mix joint group one-tenth.
The present invention also constructs a kind of command identifying lamp, comprises above-described LED control circuit.
Implement sign lamp of the present invention and LED control circuit thereof, can pass through filter capacitor C1 filtering interference signals, and this LED control circuit has reliably, advantage such as cheap, simple, efficient, has overcome the defective that one-chip machine port is subject to disturb.
Further, some signals of disturbing can not filtered capacitor C 1 filtering, and the first input end of single-chip microcomputer U1 is when receiving the high level input signal, time-delay first-class is treated the time earlier, judge that more whether received high level input signal exists, if exist, thinks that then this input signal is a useful signal after the time-delay stand-by period, thereby respond this input signal, if do not exist, think that then this input signal is an interference signal, thereby do not respond this input signal, further filtering interference signals like this, just.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the circuit diagram of the LED control circuit embodiment one of command identifying lamp of the present invention.
Embodiment
As shown in Figure 1, in the circuit diagram of the LED of command identifying lamp of the present invention control circuit embodiment one, this circuit comprises power supply, single-chip microcomputer U1, touch-switch S1, pull-up resistor R1, filter capacitor C1, NPN type triode Q1, Q2, current-limiting resistance R5, R6, R7, R8, R9, oscillation resistance R2, pull-up resistor R3, reset capacitance C3, divider resistance R4, three ends are adjustable shunting a reference source U2, counnter attack diode D1 and led light source group, wherein, power supply adopts the 3.7V lithium battery, it is the chip of HT46R47 that single-chip microcomputer U1 can adopt model, perhaps adopt the single-chip microcomputer or the MCU of other identical functions, three ends are adjustable, and shunting a reference source U2 can adopt model is the chip of TL431, perhaps adopt the chip of other identical functions, triode Q1, Q2 is a NPN type triode, and the led light source group is by a plurality of LED serial or parallel connections or mix joint group one-tenth.
The positive pole of the cathode connecting diode D1 of lithium battery, the negative pole of diode D1 connects the 12nd pin (VDD) of single-chip microcomputer U1, the negative pole of lithium battery connects the 9th pin (VSS) of single-chip microcomputer U1, and ground connection together, damages subsequent conditioning circuit when diode D1 is used to prevent the lithium battery reversal connection.The end of touch-switch S1 connects the positive pole of lithium battery, its other end is by pull-up resistor R1 ground connection, the 17th pin of single-chip microcomputer U1 connects the other end of touch-switch S1, filter capacitor C1 one end ground connection, its other end connects the 17th pin of single-chip microcomputer U1, the 16th pin of single-chip microcomputer U1 connects the base stage of triode Q2 by current-limiting resistance R6, the grounded emitter of triode Q2, its collector electrode connects the negative pole of led light source group by current-limiting resistance R7, the 4th pin of single-chip microcomputer U1 connects the base stage of triode Q1 by current-limiting resistance R5, the grounded emitter of triode Q1, its collector electrode is by the current-limiting resistance R8 of two parallel connections, R9 connects the negative pole of led light source group, and the positive pole of led light source group connects the positive pole of lithium battery.Oscillation resistance R2 is connected between the 13rd pin (OSC1) and ground of single-chip microcomputer U1.The positive pole of pull-up resistor R3 one termination lithium battery, its other end is by reset capacitance C3 ground connection, and the 11st pin (RES) of single-chip microcomputer U1 connects the other end that draws resistance R 3.The end of divider resistance R4 connects the 15th pin of single-chip microcomputer U1, and its other end connects negative electrode and the reference edge of the adjustable shunting a reference source of three ends U2 respectively, and the 8th pin of single-chip microcomputer U1 connects the other end of divider resistance R4.
Wherein, in order to strengthen filter effect, also need to realize following logic function unit in single-chip microcomputer inside by the mode of software programming.Above-mentioned single-chip microcomputer comprises:
Delay unit is used for the input signal that described single-chip microcomputer (U1) first input end receives is delayed time;
Timing unit is used for timing one default delay time;
Judging unit, be used to judge whether the input signal that described single-chip microcomputer (U1) first input end receives exists, if exist, then described input signal is inputed to signal processing unit behind the described default delay time of time-delay, if do not exist, then do not respond described input signal;
Signal processing unit is used for the result according to described judging unit output, and output drive signal is luminous to control described led light source group.
The following describes the operation principle of LED control circuit of the present invention.After lithium battery powers on for single-chip microcomputer U1, circuit is started working, oscillation resistance R1 provides running clock for single-chip microcomputer U1, the reset capacitance C3 single-chip microcomputer U1 that is used to reset, under normal condition, when touch-switch S1 is pressed for the first time, the 17th pin of single-chip microcomputer U1 is communicated with the positive pole of lithium battery, the input voltage of the 17th pin of single-chip microcomputer U1 is drawn high, single-chip microcomputer U1 detects its 17th pin input high level, at this moment, time-delay first-class is treated the time, such as above-mentioned default delay time, the time of pressing because of touch-switch S1 is second (s) level, and be millisecond (ms) level or nanosecond (ns) level interference time, therefore, the scope of waiting time can be got touch-switch S1 and be pressed value between time and interference time, after the stand-by period time-delay, the high level that single-chip microcomputer U1 detects its 17th pin input still exists, just can judge that this input signal is not an interference signal, be effective input signal, single-chip microcomputer U1 controls its 16th pin output high level then, and controls its 4th pin output low level, triode Q2 conducting, triode Q1 ends, and the collector voltage of triode Q2 is dragged down, at this moment, the positive pole of led light source group inserts the positive pole of lithium battery, its negative pole forms path by current-limiting resistance R7 ground connection, and the led light source group is luminous.
If will adjust the luminosity of led light source group, need press touch-switch S1 once more, similarly, single-chip microcomputer U1 detects its 17th pin input high level, and the time-delay stand-by period is if judge that this input signal is effective input signal, then control its 16th pin output low level, and control its 4th pin output high level, triode Q2 ends, triode Q1 conducting, the positive pole of led light source group inserts the positive pole of lithium battery, negative pole forms path by current-limiting resistance R8, R9 ground connection, and the led light source group is luminous.Different because of the resistance of resistance after current-limiting resistance R8, the R9 parallel connection and current-limiting resistance R7, the drive current of led light source group is also just different, and therefore, the brightness of led light source group changes.At this, should be noted that and according to actual needs the resistance of current-limiting resistance R7, R8, R9 to be set, thereby when realizing that the led light source group inserts different current-limiting resistances, send the light of varying strength.
If will close the led light source group, need press touch-switch S1 once more, similarly, single-chip microcomputer U1 detects its 17th pin input high level, and the time-delay stand-by period is if judge that this input signal is effective input signal, then control all output low levels of its 16th pin and the 4th pin, triode Q1, not conductings of Q2, the led light source group can't insert lithium battery, thereby stops luminous.
To sum up, this LED control circuit can be realized: press touch-switch S1 for the first time, the led light source group is sent the light of first kind of intensity, presses touch-switch S1 for the second time, and the led light source group is sent the light of second kind of intensity, presses touch-switch S1 for the third time, stops luminous.But the present invention is not restricted to this, can adjust the number that the led light source group is sent varying strength light according to actual needs.
When the circuit operate as normal; three ends are adjustable, and shunting a reference source U2 provides reference voltage for comparing cell voltage; the 15th pin output high level of single-chip microcomputer U1; after the adjustable shunting a reference source of three ends U2 voltage stabilizing; the voltage of the 8th pin input 2.5V of single-chip microcomputer U1; can be with this voltage as reference voltage; also this voltage can be multiply by behind the corresponding multiple as reference voltage; for example; with 2.8V; 3.0V as reference voltage; single-chip microcomputer U1 compares the input voltage and the reference voltage of lithium battery; when the input voltage of judging lithium battery is lower than reference voltage, think that then the output voltage of lithium battery is low excessively, single-chip microcomputer U1 controls its 16th pin and the equal output LOW voltage of the 4th pin; with shutoff led light source group, thereby lithium battery was carried out putting protection.
When the circuit operate as normal, if the high level of interference signal occurs, at first, filter capacitor C1 is this interference signal filtering, thereby avoids this interference signal to cause misoperation.If filter capacitor C1 can not be clean with this interference signal filtering, single-chip microcomputer U1 detects its 17th pin input high level, at this moment, time-delay first-class is treated the time, because of the time of occurrence of waiting time greater than interference signal, so, after the time-delay stand-by period, interference signal disappears, and what single-chip microcomputer U1 detected its 17th pin input is low level, think that then this input signal is an interference signal, thereby do not respond this input signal.Simultaneously, but also filtering interference signals of filter capacitor C4, different is, the main filtering of filter capacitor C4 be conducted interference signal by the conduction of led light source group, capacitor C 1 main filtering be the radiated interference signal that transmits by the space.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.
Claims (10)
1. the LED control circuit of a command identifying lamp, it is characterized in that, comprise power supply, single-chip microcomputer (U1), touch-switch (S1), first pull-up resistor (R1), first filter capacitor (C1), first switching tube, first current-limiting resistance (R7) and led light source group, wherein, one end of described touch-switch (S1) connects the output head anode of power supply, the other end of described touch-switch (S1) is by first pull-up resistor (R1) ground connection, the first input end of described single-chip microcomputer (U1) connects the other end of described touch-switch (S1), described first filter capacitor (C1) is connected between the first input end and ground of described single-chip microcomputer (U1), first output of described single-chip microcomputer (U1) is successively by first switching tube, first current-limiting resistance (R7) connects the negative pole of described led light source group, and the positive pole of described led light source group connects the output head anode of power supply.
2. LED control circuit according to claim 1 is characterized in that, described single-chip microcomputer comprises:
Delay unit is used for the input signal that described single-chip microcomputer (U1) first input end receives is delayed time;
Timing unit is used for timing one default delay time;
Judging unit, be used to judge whether the input signal that described single-chip microcomputer (U1) first input end receives exists, if exist, then described input signal is inputed to signal processing unit behind the described default delay time of time-delay, if do not exist, then do not respond described input signal;
Signal processing unit is used for the result according to described judging unit output, and output drive signal is luminous to control described led light source group.
3. LED control circuit according to claim 1 is characterized in that, also comprises second filter capacitor (C4) that is used for filtering interference signals, and described second filter capacitor (C4) is connected between the negative pole and ground of described led light source group.
4. LED control circuit according to claim 1 is characterized in that, also comprises the second switch pipe and second current-limiting resistance, and second output of described single-chip microcomputer connects the negative pole of described led light source group successively by the second switch pipe and second current-limiting resistance.
5. LED control circuit according to claim 1, it is characterized in that, also comprise the adjustable shunting a reference source of divider resistance and three ends, the 3rd output of described single-chip microcomputer connects second input of single-chip microcomputer by divider resistance, second input that the negative electrode of the adjustable shunting a reference source of described three ends and reference edge together connect single-chip microcomputer, its plus earth.
6. LED control circuit according to claim 1 is characterized in that, described power supply is a lithium battery, and the positive pole of described lithium battery connects the power end of described single-chip microcomputer (VDD), and its negative pole connects the ground voltage terminal (VSS) of single-chip microcomputer.
7. LED control circuit according to claim 6 is characterized in that, also comprises oscillation resistance (R2), and described oscillation resistance (R2) is connected between the oscillator input and ground of described single-chip microcomputer.
8. LED control circuit according to claim 1, it is characterized in that, also comprise second pull-up resistor (R3) and reset capacitance (C3), the output head anode of one termination power of described second pull-up resistor (R3), the other end of described second pull-up resistor (R3) is by reset capacitance (C3) ground connection, and the reset terminal of described single-chip microcomputer connects the described other end of described second pull-up resistor (R3).
9. LED control circuit according to claim 1 is characterized in that, described led light source group is by a plurality of LED serial or parallel connections or mix joint group one-tenth.
10. a command identifying lamp is characterized in that, comprises each described LED control circuit of claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010042868 CN101801128B (en) | 2010-01-21 | 2010-01-21 | Command marker lamp and LED control circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010042868 CN101801128B (en) | 2010-01-21 | 2010-01-21 | Command marker lamp and LED control circuit thereof |
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| CN101801128A true CN101801128A (en) | 2010-08-11 |
| CN101801128B CN101801128B (en) | 2013-10-09 |
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| CN 201010042868 Expired - Fee Related CN101801128B (en) | 2010-01-21 | 2010-01-21 | Command marker lamp and LED control circuit thereof |
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Cited By (3)
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| CN103458552A (en) * | 2012-05-30 | 2013-12-18 | 海洋王照明科技股份有限公司 | LED lamp and start control circuit thereof |
| WO2015196893A1 (en) * | 2014-06-23 | 2015-12-30 | 深圳彩芯智科技有限公司 | Led lamp string control circuit and led lamp string controller |
| CN110504827A (en) * | 2019-09-25 | 2019-11-26 | 赛尔富电子有限公司 | A kind of anti-interference control circuit |
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| CN200953675Y (en) * | 2006-10-09 | 2007-09-26 | 赖丽纯 | Controlling device of working light |
| CN101399536A (en) * | 2007-09-30 | 2009-04-01 | 天津市研翔电子科技有限公司 | On/off control circuit for light touch switch in micro-controller system and control method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103458552A (en) * | 2012-05-30 | 2013-12-18 | 海洋王照明科技股份有限公司 | LED lamp and start control circuit thereof |
| CN103458552B (en) * | 2012-05-30 | 2016-03-30 | 海洋王照明科技股份有限公司 | A kind of LED lamp and start control circuit thereof |
| WO2015196893A1 (en) * | 2014-06-23 | 2015-12-30 | 深圳彩芯智科技有限公司 | Led lamp string control circuit and led lamp string controller |
| CN110504827A (en) * | 2019-09-25 | 2019-11-26 | 赛尔富电子有限公司 | A kind of anti-interference control circuit |
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| CN101801128B (en) | 2013-10-09 |
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