CN103167671A - Signal indicator light and light-operated flicker control circuit thereof - Google Patents
Signal indicator light and light-operated flicker control circuit thereof Download PDFInfo
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- CN103167671A CN103167671A CN 201110418215 CN201110418215A CN103167671A CN 103167671 A CN103167671 A CN 103167671A CN 201110418215 CN201110418215 CN 201110418215 CN 201110418215 A CN201110418215 A CN 201110418215A CN 103167671 A CN103167671 A CN 103167671A
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Abstract
The invention discloses a signal indicator light and a light-operated flicker control circuit thereof. The light-operated flicker control circuit thereof comprises a photoconductive resistance, a control audion, a driving audion, and two oscillation capacitors. The first oscillation capacitor is bridged between a base of the driving audion and a collector of the control audion. The second oscillation capacitor is bridged between a collector of the driving audion and a base of the control audion. When the photoconductive resistance does not sense outside brightness and is in high impedance, the control audion is in cut-off state, the driving audion is in conducting state, and a luminous element is in a normally on working condition. When the photoconductive resistance senses the outside brightness and is in the high impedance, the control audion and the driving audition are in alternate state of conducting and cut-off with the help of the alternate charge-discharge process of the first oscillation capacitor and the second oscillation capacitor, and the luminous element is in flicker working condition. The signal indicator light and the light-operated flicker control circuit thereof can guarantee that the luminous element can automatically work in a normally on or flicker condition according to the outside brightness with simple structure and lower cost.
Description
Technical field
The present invention relates to signal lamp, relate in particular to a kind of control circuit of signal lamp.
Background technology
A lot of signal lamps in the market are all the light fixtures that belong to normal bright or normal sudden strain of a muscle.The mode of operation of Chang Liang, the working life of light-emitting component such as LED is shortened in unnecessary energy consumption when existing external environment condition brightness enough.Normal mode of operation of dodging, when existing again external environment condition brightness inadequate, luminosity is inadequate, causes the not good problem of indicating effect.
The problems such as in addition, existing light-operated flicker control circuit has more complicated structure usually, and components and parts used are more, cost is higher.As seen, be necessary existing light-operated flicker control circuit is improved in fact.
Summary of the invention
Technical problem to be solved by this invention is the deficiency that exists for above-mentioned prior art, and a kind of light-operated flicker control circuit is proposed, can realize making controlled light-emitting component automatically work in normal bright or flicker according to outside light with better simply structure, lower cost.
The present invention addresses the above problem the technical scheme that proposes to comprise, proposes a kind of light-operated flicker control circuit, comprising: photo resistance is used for sensing outside light; Control triode, its base stage by this photo resistance connect power supply, collector electrode connects power supply by a divider resistance, drive triode, its base stage connects between power supply, collector electrode and power supply by a biasing resistor can be connected in series a light-emitting component, and this driving triode is received on a common level jointly with the emitter of controlling triode; The first oscillating capacitance is connected across between the collector electrode of the base stage of this driving triode and this control triode, and the second oscillating capacitance is connected across between the base stage of the collector electrode of this driving triode and this control triode; Do not sense outside light and when being in high impedance, this controls triode is in cut-off state, the driving triode is in conducting state in this photo resistance, can make this light-emitting component be in normal bright operating state; Sense outside light and be in low-impedance the time in this photo resistance, this control triode is in alternate conduction, cut-off state with the driving triode by the alternately charge and discharge process of this first oscillating capacitance, the second oscillating capacitance, can make this light-emitting component be in the flicker operating state.
This drives triode and the emitter common ground of controlling triode.
This biasing resistor is to come value to be set in 1 milliampere according to the base current that will drive triode.
This light-emitting component approximates 0.7 at the flicker cycle of flicker during operating state * and (the appearance value of the resistance the during Low ESR of the appearance value+photo resistance of the resistance of biasing resistor * first oscillating capacitance * second oscillating capacitance).
The appearance value of the resistance of this light-emitting component when the duty ratio of flicker during operating state approximates the Low ESR of photo resistance * second oscillating capacitance/(the appearance value of the resistance the during Low ESR of the appearance value+photo resistance of the resistance of biasing resistor * first oscillating capacitance * second oscillating capacitance).
This light-emitting component comprises light-emitting diode.
This light-emitting component also comprises a current-limiting resistance of connecting with this light-emitting diode, to determine the drive current of this light-emitting diode.
The present invention addresses the above problem the technical scheme that proposes also to comprise, proposes a kind of signal lamp, comprises light-operated flicker control circuit as above.
Compared with prior art, signal lamp of the present invention and light-operated flicker control circuit thereof can be realized making light-emitting component automatically work in normal bright or flicker according to outside light with better simply structure, lower cost.
Description of drawings
Fig. 1 is the electrical schematic diagram of signal lamp of the present invention and light-operated flicker control circuit embodiment thereof.
Embodiment
In order to make those skilled in the art person understand better technical scheme of the present invention, be described in further detail below in conjunction with drawings and Examples.
Referring to Fig. 1, signal lamp of the present invention and light-operated flicker control circuit embodiment thereof roughly comprise: a photo resistance R3; One drives triode Q1, controls triode Q2 for one; And the first oscillating capacitance C1, the second oscillating capacitance C2.Can realize making signal lamp LED1 automatically be in normal bright operating state when unglazed the photograph, make signal lamp LED automatically be in the flicker operating state when illumination is arranged.
Wherein, the emitter common ground of two triode Q1, Q2, the base stage that controls triode Q2 is connected to power Vcc by photo resistance R3, the collector electrode that drives triode Q1 is connected to power Vcc by LED signal lamp LED1, and the base stage that drives triode Q1 is connected to power Vcc by biasing resistor R1.The collector electrode that drives triode Q1 has the second oscillating capacitance C2 with the base stage cross-over connection of controlling triode Q2, and the collector electrode that controls triode Q2 has the first oscillating capacitance C1 with the base stage cross-over connection that drives triode Q1.The collector electrode that controls triode Q2 is connected to power Vcc by divider resistance R2.Also be serially connected with current-limiting resistance R5 between signal lamp LED1 and power Vcc.
The operation principle of signal lamp of the present invention and light-operated flicker control circuit thereof roughly comprises: 1. when photo resistance R3 is in unglazed photograph environment, be high-impedance state, substantially be equal to open circuit.
Control triode Q2 because of its base stage does not have bias voltage can't conducting, whole circuit can not vibrate.Drive triode Q1 and provide bias voltage conducting through biasing resistor R1 to its base stage because of power Vcc, signal lamp LED1 Chang Liang.
2. work as photo resistance R3 and see the light time, be low resistive state, flashing circuit is operated in without the steady oscillation pattern.
When initial, control triode Q2 and provide bias voltage conducting by the photo resistance R3 that impedance diminishes to its base stage because of power Vcc.After controlling triode Q2 conducting, the first oscillating capacitance C1 connects the approximate ground connection of an end of controlling triode Q2 collector electrode, and power Vcc begins the first oscillating capacitance C1 charging through biasing resistor R1.The pressure drop of instantaneous the first oscillating capacitance C1 is very little, and driving triode Q1 ends because of the bias voltage reduction of its base stage, and signal lamp LED1 extinguishes.
After time-delay, when the charging of the first oscillating capacitance C1, when making the bias voltage that drives triode Q1 base stage be elevated to the 0.7V conducting voltage, drive triode Q1 conducting, signal lamp LED1 lights.Drive the conducting of triode Q1, can make the second oscillating capacitance C2 connect the approximate ground connection of an end of driving triode Q1 collector electrode, power Vcc begins the second oscillating capacitance C2 charging through photo resistance R3.The pressure drop of instantaneous the second oscillating capacitance C2 is very little, and control triode Q2 ends because of the bias voltage reduction of its base stage.
After the time-delay, when the charging of the second oscillating capacitance C2, the bias voltage of controlling triode Q2 base stage is raise when reaching the 0.7V conducting voltage again, control the conducting again of triode Q2, can make again power Vcc begin the first oscillating capacitance C1 is charged again through biasing resistor R1.The pressure drop of instantaneous the first oscillating capacitance C1 is very little, and driving triode Q1 reduces again cut-off again because of the bias voltage of its base stage, and signal lamp LED1 extinguishes again; Flashing circuit enters the operating state of circulation conducting and cut-off, signal lamp LED1 flicker.
The present invention can determine according to LED quantity the value of power Vcc, determines the value of current-limiting resistance R5 according to the current requirements of LED.Adjust as required the value of biasing resistor R1/ photo resistance R3 and first oscillating capacitance C1/ the second oscillating capacitance C2, control the frequency that lamp dodges.
The operating current that the present invention can drive triode Q1 base stage by setting is 1mA, comes value biasing resistor R1, make drive triode Q1 can saturation conduction.Set current-limiting resistance R5 impedance according to the electric current of signal lamp LED1.Photo resistance R3 is unglazed according to the time should be several megaohms, lighting delay number ten Europe are arranged.The first oscillating capacitance C1 and the bright C2 value 10uF that fills.The time that each signal lamp is lighted, can be by to R1 * C1, during the R3(Low ESR) * C2 obtains with the ON time of formula T ≈ 0.7 * R * C calculating transistor.The frequency of the less circuit upset of T value is just higher, and lamp dodges also just faster.Can get different values and obtain different frequencies of glimmering, and the ON time on both sides can be different, to regulate duty ratio.Flicker cycle ≈ 0.7 * (R1 * C1+R3 * C2), duty ratio ≈ R3 * C2/ (R1 * C1+R3 * C2).
Compared with prior art, signal lamp of the present invention and light-operated flicker control circuit thereof can realize that light-controlled lamp dodges, and daytime, lamp dodged, and night, Chang Liang, can save the energy like this, with respect to normal bright light tool, and because the operating time shortens, longer service life; In addition, this light-operated flicker control circuit is simple and reliable, and cost is low, is suitable as the automatic control circuit of signal lamp.
Foregoing; it is only preferred embodiment of the present invention; be not for restriction embodiment of the present invention; those of ordinary skills are according to main design of the present invention and spirit; can carry out very easily corresponding flexible or modification, therefore protection scope of the present invention should be as the criterion with the desired protection range of claims.
Claims (8)
1. a light-operated flicker control circuit, is characterized in that, comprising:
Photo resistance is used for sensing outside light;
Control triode, its base stage by this photo resistance connect power supply, collector electrode connects power supply by a divider resistance;
Drive triode, its base stage connects between power supply, collector electrode and power supply by biasing resistor can be connected in series a light-emitting component, and this drivings triode is received on a common level jointly with the emitter of control triode;
The first oscillating capacitance is connected across between the collector electrode of the base stage of this driving triode and this control triode,
The second oscillating capacitance is connected across between the base stage of the collector electrode of this driving triode and this control triode;
Do not sense outside light and when being in high impedance, this controls triode is in cut-off state, the driving triode is in conducting state in this photo resistance, can make this light-emitting component be in normal bright operating state;
Sense outside light and be in low-impedance the time in this photo resistance, this control triode is in alternate conduction, cut-off state with the driving triode by the alternately charge and discharge process of this first oscillating capacitance, the second oscillating capacitance, can make this light-emitting component be in the flicker operating state.
2. according to light-operated flicker control circuit claimed in claim 1, it is characterized in that, this drives triode and the emitter common ground of controlling triode.
3. according to light-operated flicker control circuit claimed in claim 1, it is characterized in that, this biasing resistor is to come value to be set in 1 milliampere according to the base current that will drive triode.
4. according to light-operated flicker control circuit claimed in claim 1, it is characterized in that, this light-emitting component approximates 0.7 at the flicker cycle of flicker during operating state * (the appearance value of the resistance the during Low ESR of the appearance value+photo resistance of the resistance of biasing resistor * first oscillating capacitance * second oscillating capacitance).
5. according to light-operated flicker control circuit claimed in claim 1, it is characterized in that the appearance value of the resistance of this light-emitting component when the duty ratio of flicker during operating state approximates the Low ESR of photo resistance * second oscillating capacitance/(the appearance value of the resistance the during Low ESR of the appearance value+photo resistance of the resistance of biasing resistor * first oscillating capacitance * second oscillating capacitance).
6. according to light-operated flicker control circuit claimed in claim 1, it is characterized in that, this light-emitting component comprises light-emitting diode.
7. according to light-operated flicker control circuit claimed in claim 6, it is characterized in that, this light-emitting component also comprises a current-limiting resistance of connecting with this light-emitting diode, to determine the drive current of this light-emitting diode.
8. a signal lamp, is characterized in that, comprises described light-operated flicker control circuit as arbitrary in claim 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110418215 CN103167671A (en) | 2011-12-14 | 2011-12-14 | Signal indicator light and light-operated flicker control circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110418215 CN103167671A (en) | 2011-12-14 | 2011-12-14 | Signal indicator light and light-operated flicker control circuit thereof |
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| Publication Number | Publication Date |
|---|---|
| CN103167671A true CN103167671A (en) | 2013-06-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110418215 Pending CN103167671A (en) | 2011-12-14 | 2011-12-14 | Signal indicator light and light-operated flicker control circuit thereof |
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|---|---|
| CN (1) | CN103167671A (en) |
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2011
- 2011-12-14 CN CN 201110418215 patent/CN103167671A/en active Pending
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Application publication date: 20130619 |