CN105188231A - LED automatic light supplementing lamp control circuit suitable for security camera - Google Patents
LED automatic light supplementing lamp control circuit suitable for security camera Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention discloses an LED automatic light supplement lamp control circuit suitable for a security camera, which comprises a photosensitive sensor, a voltage detection switch and a constant current source, wherein the photosensitive sensor, the voltage detection switch and the constant current source are sequentially connected to a first input end of an LED; the constant current source is used for driving the LED to ensure that the LED works under constant current, and the photosensitive sensor is used for sensing the change of the external illumination intensity; the voltage detection switch is used for adjusting the output current of the constant current source in real time according to the external illumination intensity detected by the photosensitive sensor. The voltage stabilizing circuit and the hysteresis circuit provided by the invention can well simplify the existing infrared LED module scheme, reduce the number of devices, reduce the occupied area of a PCB (printed Circuit Board), optimize the LED module design scheme, improve the production efficiency and the through rate of products and reduce the cost while ensuring that the functions meet the requirements and the electrical performance is stable and reliable.
Description
Technical field
The invention belongs to safety monitoring technical field, more specifically, relate to a kind of LED automatic light-supplementing lamp control circuit being applicable to security monitoring video camera.
Background technology
The fast development of security protection industry, the light compensating lamp infrared LED module as night viewing camera have also been obtained fast development.
Figure 1 shows that now conventional infrared LED module block diagram, comprise the unit compositions such as voltage stabilizing circuit, light sensor, sluggish switch, constant current driving, LED and PCB.Wherein part module does not use voltage stabilizing circuit, but like this can because outer power voltage instability causes LED to start and closes close point change.Sluggish switch sections generally uses operational amplifier LM358 to do hysteresis comparator or uses NE555 to make trigger.
The power of single infrared LED is less, module needs the infrared LED installing a greater number, owing to being subject to the restriction of structure and outward appearance, circuit components just can only put the back side of infrared LED on module, and can only be placed between LED pin, because circuit is comparatively complicated, components and parts are more, and LM358 or NE555 volume is larger, cause like this LED module in the design process element must with the result such as LED pin is very near, module is finally caused to occur in process of production connecting tin, rosin joint, few tin, fall the unfavorable conditions such as part, use in automatic AI machine plug-in unit process, frequent appearance damages the phenomenon of element, have a strong impact on production efficiency.
Summary of the invention
For the defect of prior art, the object of the present invention is to provide a kind of LED automatic light-supplementing lamp control circuit being applicable to security monitoring video camera, be intended to solve module in prior art occur in process of production connecting tin, rosin joint, few tin, falling the unfavorable conditions such as part, use in automatic AI machine plug-in unit process, frequent appearance damages the phenomenon of element, has a strong impact on the problem of production efficiency.
The invention provides a kind of LED automatic light-supplementing lamp control circuit being applicable to security monitoring video camera, comprising: be connected to the light sensor of the signal input part of LED, voltage detection switch and constant-current source in turn; The output of described LED is connected to the input of light sensor; Described constant-current source is used for driving LED and ensures that described LED works at constant current; Described light sensor is for responding to ambient light according to Strength Changes; The extraneous intensity of illumination that described voltage detection switch is used for detecting according to described light sensor adjusts the output current of described constant-current source in real time.
Further, described constant-current source is Linear CCS.Described Linear CCS comprises the first switching tube, second switch pipe and the first resistance R1; One end of described first resistance R1 is connected with the first end of described first switching tube, and the other end of described first resistance R1 is connected with one end of described second switch pipe, is also connected with the control end of described first switching tube; The control end of described second switch pipe is connected with the second end of described first switching tube, and the second end of described second switch pipe is for connecting described LED.
Further, described first switching tube and described second switch pipe are triode, and the base stage of described triode is as described control end, and the emitter of described triode is as described first end, and the collector electrode of described triode is as described second end.
Further, described voltage detection switch comprises the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 and voltage detector component Q3; The input of described voltage detector component Q3 is connected to power supply VCC by the 4th resistance R4 that is sequentially connected in series and the second resistance R2, and described 4th resistance R4 and described second resistance R2 is connected in series the second end held and be connected to described first switching tube; Described 6th resistance R6, described 3rd resistance R3 and described 5th resistance R5 are sequentially connected in series the reference voltage output terminal at described power supply VCC and described voltage detector component Q3; Being connected in series of described 6th resistance R6 and described 3rd resistance R3 hold be connected to the 2nd LED and the 3rd LED be connected in series end; Being connected in series of described 3rd resistance R3 and described 5th resistance R5 hold be connected to a LED and the 2nd LED be connected in series end.
Further, described voltage detection switch comprises the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 and voltage detector component Q3; The input of described voltage detector component Q3 is connected to power supply VCC by the 4th resistance R4 that is sequentially connected in series and the second resistance R2, and described 4th resistance R4 and described second resistance R2 is connected in series the second end held and be connected to described first switching tube; Described 6th resistance R6 and described 3rd resistance R3 is sequentially connected in series the reference voltage output terminal at described power supply VCC and described voltage detector component Q3; Being connected in series of described 6th resistance R6 and described 3rd resistance R3 hold be connected to the 2nd LED and the 3rd LED be connected in series end; What one end of described 5th resistance R5 was connected to a LED and the 2nd LED is connected in series end, and the other end of described 5th resistance R5 is connected to the reference voltage output terminal of described voltage detector component Q3.
Further, described voltage detector component Q3 is NPN triode, or NMOS tube, or controllable accurate source of stable pressure TL431, or reset IC.
Further, light sensor is photo resistance or photodiode.
Voltage stabilizing circuit provided by the invention and hysteresis circuitry meet the requirements at assurance function, while electric property is reliable and stable, existing infrared LED module scheme can well be simplified, decrease the quantity of device, decrease the area occupied of PCB, optimize LED module design scheme, improve production efficiency and the first-pass yield of product, reduce cost.
Accompanying drawing explanation
Figure 1 shows that now conventional infrared LED module block diagram.
Figure 2 shows that infrared LED module block diagram of the present invention.
Figure 3 shows that conventional infrared LED microampere order volt-ampere characteristic figure.
Figure 4 shows that conventional infrared LED milliampere level volt-ampere characteristic figure.
Figure 5 shows that circuit theory diagrams according to an embodiment of the invention.
Figure 6 shows that circuit theory diagrams in accordance with another embodiment of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The present invention carries out to solve the problem, its objective is and a kind of more succinct infrared LED module drive circuit is provided, as shown in Figure 2, and the circuit of this structure makes user can be easy to regulating circuit parameter, for adapting to different light sensors or meeting the LED startup of different user or close close point.
The first, the invention provides a kind of voltage stabilizing circuit, it comprises resistance R6 and LED3-LEDn etc.It, for giving the power supply of light sensor circuit with stable, effectively can prevent from changing because outer power voltage changes the circuit parameter caused, its device of powering also can be protected not damaged by the high voltage that external power source is scurried into.
Second, present invention also offers a kind of easy sluggish switching circuit, it comprises the part of voltage detection device Q3, resistance R3, R5 and LED, voltage signal when infrared LED is worked is incorporated into the control end of voltage detection device, realize feedback, eliminate IC, decrease the auxiliary element of surrounding, simplify circuit.
According to first and second point, present invention also offers new method for stabilizing voltage and new hysteresis circuitry implementation method.
Method for stabilizing voltage: use LED forward voltage drop in certain current range to compare fixation principle, use multiple LED strip to join, in the led by the electric current of certain limit (200uA-600uA), plurality of LEDs is the stackable stabilized voltage power supply going out to need just.
Sluggish implementation method: by dividing potential drop in series with a resistor for transducer, use the voltage after the units test dividing potential drop simply with voltage detecting characteristic, then use the resistance by feedback adjusting divider resistance, just can realize sluggishness.
Voltage stabilizing circuit provided by the invention and hysteresis circuitry meet the requirements at assurance function, while electric property is reliable and stable, existing infrared LED module scheme can well be simplified, decrease the quantity of device, decrease the area occupied of PCB, optimize LED module design scheme, improve production efficiency and the first-pass yield of product, reduce cost.
Fig. 2 gives the theory diagram being applicable to the LED automatic light-supplementing lamp control circuit of security monitoring video camera provided by the invention, and for convenience of explanation, illustrate only the part relevant to the embodiment of the present invention, details are as follows:
LED automatic light-supplementing lamp control circuit comprises the constant-current source of the first input end being connected to LED in turn, voltage detection switch and light sensor; Wherein, constant-current source is used for driving LED, ensures that LED works at constant current, and voltage detection switch is for detecting the voltage of light sensor device positive input terminal, and light sensor is for responding to ambient light according to Strength Changes.
Below in conjunction with drawings and Examples, the invention will be further described.
Infrared LED belongs to diode, the voltage compare of PN joint is fixed, if Fig. 3 is conventional infrared LED microampere order volt-ampere characteristic figure, when the electric current that LED passes through is between 200uA-600uA, forward voltage drop is basically stable at 1.2V, and infrared LED when working under this electric current, personnel can't see red quick-fried phenomenon completely.If Fig. 4 is conventional infrared LED milliampere level volt-ampere characteristic figure, when the electric current that LED passes through is between 45mA-50mA, forward voltage drop is basically stable at 1.42V-1.45V.
Fig. 5 and Fig. 6 is the circuit theory diagrams according to two embodiments of the present invention.Wherein CDS is light sensor, (characteristic is: illumination is stronger specifically can to adopt photo resistance, resistance is less, illumination is more weak, resistance is larger) or photodiode (characteristic is: illumination is stronger, electric current is larger, illumination is more weak, electric current is less), Q3 is voltage detection device, the high circuit of required precision can use TL431 or reset IC (such as SG809), and the not high circuit of required precision can use NPN triode or N-MOS to manage, and what Q1, Q2 and resistance R1 formed is Linear CCS.
Fig. 5 is example, first suppose that CDS is photo resistance, ambient condition is that exterior light is shone very by force, makes photo resistance resistance very little, dividing potential drop is carried out by resistance R3, resistance R5 and photo resistance CDS, at voltage detection device input coating-forming voltage Vref, now the level of voltage Vref is lower than threshold voltage, and voltage detection device is closed, resistance R4 does not have electric current to pass through, Q1 and Q2 can not form bias current, can not conducting, and constant-current source is output current not.Use different voltage detection devices, threshold voltage is different, and device itself determines, such as: the triode of NPN is generally 0.65-0.75, and TL431 is generally 2.5V, and N-MOS is generally about 1.2V.
Power supply forms current circuit by resistance R6 and infrared LED 3-LEDn to negative pole, and by selecting the resistance of resistance R6, make electric current at about 400uA, superposed like this by the forward voltage drop of infrared LED, just define stabilized voltage power supply at B point, voltage is Vb.
When the illumination of outside reduces, the resistance of photo resistance CDS is increased, and the voltage of further voltage detection device input will increase, when voltage increases to threshold voltage, sense switch is opened, and further constant-current source opens output, and infrared LED is opened, stabilized voltage power supply is formed at A point, voltage is Va, and voltage Va is transferred to the input pole of voltage detection device by resistance R5, and the voltage that Vref is held raises further, formed and trigger, infrared lamp is opened completely.
When infrared lamp is opened, when outside illumination raises, the resistance of photo resistance CDS is reduced, and the voltage Vref of the input of further voltage detection device reduces, when voltage Vref is reduced to threshold voltage, sense switch is tending towards cutting out, and is reduced by electric current, and constant-current source output current reduces, the voltage Va that infrared LED is superposed reduces, further make the voltage of voltage detection device input reduce, formed and trigger, infrared lamp is closed completely.
Circuit parameter principle of specification below by reality:
Suppose supply voltage VCC=12V, voltage detection device selects TL431, and door capable of being opened voltage limit is 2.5V, and GL5516 is selected in photo resistance, turns on light when resistance Rcds is more than or equal to 120K, turns off the light when being less than or equal to 40K.LEDn in Fig. 4 is LED6, and when infrared LED is opened, constant-current source exports 45-50mA.
When infrared LED is closed: Vb=1.2 × 4=4.8V; R6=(VCC-4.8)/0.0004=18K Ω; R3+R5=(Vb-2.5)/(2.5/Rcds)=92K; So when circuit normally detects, the maximum current that R3 and R5 flows through is (Vb-2.5)/(R3+R5)=25uA, is far smaller than the electric current that R6 exports, so stabilized voltage power supply Vb output current is enough.
When supposing that supply voltage reduction makes the electric current on infrared LED be 200uA: Vcc=4.8+0.0002 × R6=8.4V; When supposing that supply voltage rising makes the electric current on infrared LED be 600uA: Vcc=4.8+0.0006 × R6=15.6V;
As long as when can prove that supply voltage is between 8.4V-15.6V by calculating above, stabilized voltage power supply Vb can be very stable, can meet instructions for use.
When infrared LED is opened: Va=1.45 × 5=7.25V; R5=(Va-2.5)/(2.5/Rcds)=76K Ω; The resistance that so just can calculate R3 is: R3=92-76=16K;
Can prove that this circuit meets instructions for use by calculating above, functionally can substitute used scheme completely.
On the basis of having read this specification, it should be appreciated by those skilled in the art, in Fig. 6 circuit, voltage stabilizing circuit, constant-current circuit, current detection section and Fig. 5 are just the same, only have the series connection divider resistance of light sensor and LED different from the connected mode that voltage detection switch inputs the feedback resistance that pole connects.The illumination of case of external is very strong, voltage detection switch is closed, constant-current source no-output, resistance R5 no current passes through, resistance R3 and CDS is only had to form series connection dividing potential drop, when the illumination of outside reduces, the resistance of photo resistance CDS is increased, the voltage of further voltage detection device input will increase, when voltage increases to threshold voltage, sense switch is opened, further constant-current source opens output, infrared LED is opened, stabilized voltage power supply is formed at A point, voltage is Va, voltage Va is transferred to the input pole of voltage detection device by resistance R5, the voltage that Vref is held raises further, formed and trigger, infrared lamp is opened completely, now resistance R3, R5 and light sensor CDS forms bleeder circuit, when the illumination of outside raises, the resistance of photo resistance CDS is reduced, the voltage Vref of the input of further voltage detection device reduces, when voltage Vref is reduced to threshold voltage, sense switch is tending towards cutting out, reduced by electric current, constant-current source output current reduces, the voltage Va that infrared LED is superposed reduces, the voltage of voltage detection device input is further made to reduce, formed and trigger, infrared lamp is closed completely.
After photo resistance is replaced with photodiode, principle is substantially the same, and just photodiode is the device of current mode, uses Current calculation circuit parameter.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. be applicable to a LED automatic light-supplementing lamp control circuit for security monitoring video camera, it is characterized in that, described LED automatic light-supplementing lamp control circuit comprises: be connected to the light sensor of the signal input part of LED, voltage detection switch and constant-current source in turn; The output of described LED is connected to the input of light sensor;
Described constant-current source is used for driving LED and ensures that described LED works at constant current; Described light sensor is for responding to ambient light according to Strength Changes; The extraneous intensity of illumination that described voltage detection switch is used for detecting according to described light sensor adjusts the output current of described constant-current source in real time.
2. LED automatic light-supplementing lamp control circuit as claimed in claim 1, it is characterized in that, described constant-current source is Linear CCS.
3. LED automatic light-supplementing lamp control circuit as claimed in claim 2, it is characterized in that, described Linear CCS comprises the first switching tube, second switch pipe and the first resistance R1;
One end of described first resistance R1 is connected with the first end of described first switching tube, and the other end of described first resistance R1 is connected with one end of described second switch pipe, is also connected with the control end of described first switching tube;
The control end of described second switch pipe is connected with the second end of described first switching tube, and the second end of described second switch pipe is for connecting described LED.
4. LED automatic light-supplementing lamp control circuit as claimed in claim 3, it is characterized in that, described first switching tube and described second switch pipe are triode, the base stage of described triode is as described control end, the emitter of described triode is as described first end, and the collector electrode of described triode is as described second end.
5. the LED automatic light-supplementing lamp control circuit as described in any one of claim 1-4, is characterized in that, described voltage detection switch comprises the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 and voltage detector component Q3;
The input of described voltage detector component Q3 is connected to power supply VCC by the 4th resistance R4 that is sequentially connected in series and the second resistance R2, and described 4th resistance R4 and described second resistance R2 is connected in series the second end held and be connected to described first switching tube;
Described 6th resistance R6, described 3rd resistance R3 and described 5th resistance R5 are sequentially connected in series the reference voltage output terminal at described power supply VCC and described voltage detector component Q3;
Being connected in series of described 6th resistance R6 and described 3rd resistance R3 hold be connected to the 2nd LED and the 3rd LED be connected in series end;
Being connected in series of described 3rd resistance R3 and described 5th resistance R5 hold be connected to a LED and the 2nd LED be connected in series end.
6. the LED automatic light-supplementing lamp control circuit as described in any one of claim 1-4, is characterized in that, described voltage detection switch comprises the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 and voltage detector component Q3;
The input of described voltage detector component Q3 is connected to power supply VCC by the 4th resistance R4 that is sequentially connected in series and the second resistance R2, and described 4th resistance R4 and described second resistance R2 is connected in series the second end held and be connected to described first switching tube;
Described 6th resistance R6 and described 3rd resistance R3 is sequentially connected in series the reference voltage output terminal at described power supply VCC and described voltage detector component Q3;
Being connected in series of described 6th resistance R6 and described 3rd resistance R3 hold be connected to the 2nd LED and the 3rd LED be connected in series end;
What one end of described 5th resistance R5 was connected to a LED and the 2nd LED is connected in series end, and the other end of described 5th resistance R5 is connected to the reference voltage output terminal of described voltage detector component Q3.
7. the LED automatic light-supplementing lamp control circuit as described in claim 5 or 6, is characterized in that, described voltage detector component Q3 is NPN triode, or NMOS tube, or controllable accurate source of stable pressure TL431, or reset IC.
8. the LED automatic light-supplementing lamp control circuit as described in any one of claim 1-7, is characterized in that, described light sensor is photo resistance or photodiode.
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| CN201510691087.6A CN105188231B (en) | 2015-10-22 | 2015-10-22 | LED automatic light supplementing lamp control circuit suitable for security camera |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510691087.6A CN105188231B (en) | 2015-10-22 | 2015-10-22 | LED automatic light supplementing lamp control circuit suitable for security camera |
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| CN105188231B CN105188231B (en) | 2017-11-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111182699A (en) * | 2018-10-24 | 2020-05-19 | 殷创科技（上海）有限公司 | Intelligent adjustable vehicle-mounted driver and passenger monitoring light source |
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2015
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| JP2004109604A (en) * | 2002-09-19 | 2004-04-08 | Canon Inc | Camera having synchronization terminal for flash light emitting device |
| CN203691679U (en) * | 2013-11-08 | 2014-07-02 | 刘云腾 | Light-operated LED infrared lamp circuit |
| CN204272452U (en) * | 2014-12-10 | 2015-04-15 | 重庆中科芯亿达电子有限公司 | Security monitoring LED driver chip |
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