CN203691679U - Light-operated LED infrared lamp circuit - Google Patents
Light-operated LED infrared lamp circuit Download PDFInfo
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- CN203691679U CN203691679U CN201320699515.6U CN201320699515U CN203691679U CN 203691679 U CN203691679 U CN 203691679U CN 201320699515 U CN201320699515 U CN 201320699515U CN 203691679 U CN203691679 U CN 203691679U
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- infrared lamp
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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 utility model discloses a light-operated LED infrared lamp circuit which is disposed on an infrared lamp plate of a camera. The circuit comprises a three-terminal adjustable reference circuit, a LED lamp parallel circuit, a first triode switch circuit, a second triode switch circuit and a three-terminal voltage stabilizing circuit which are connected successively. According to the utility model, the light-operated circuit is arranged outside the camera and is directly disposed on the infrared lamp plate. The controlling of the circuit is more accurate without generating errors. In addition, the structure of the circuit is simplified, and the circuit is convenient to maintain and low in maintenance cost.
Description
Technical field
The utility model relates to a kind of light-operated circuit, relates in particular to a kind of light-operated LED infrared lamp circuit.
Background technology
The utility model is mainly the improvement of doing for the video camera of road monitoring, existing video camera divides two kinds, a kind of is timing switch, this video camera can carry out imaging switching round the clock, be color picture daytime, and be black and white photograph night, switches such as being arranged on 18 of every days, its shortcoming is inaccurate, and time daytime in winter is shorter or cloudyly all can exert an influence; Another kind is light-operated, and light-operated circuit is arranged on video camera the inside, by camera chip control, shortcoming is that light-dependent control element is located in video camera, may be in the light, and produces error, and making again the circuit in video camera more complicated, maintenance need to disassemble, extremely inconvenient.
Summary of the invention
The purpose of this utility model is just to provide one to address the above problem, and light-operated circuit is exposed to video camera outside, is set directly on infrared light board, and it is more accurate to control, and can not produce error, and circuit is simple, light-operated LED infrared lamp circuit easy to maintenance.
To achieve these goals, the technical solution adopted in the utility model is such: a kind of light-operated LED infrared lamp circuit, be arranged on the infrared light board of video camera, comprise the three end adjustable reference circuit, LED lamp parallel circuits, the first transistor switching circuit, the second transistor switching circuit and the three-terminal voltage-stabilizing circuit that connect successively;
Described three end adjustable reference circuit comprise a controllable accurate source of stable pressure, and the reference utmost point of described controllable accurate source of stable pressure is leaded up to the first resistance and met VCC, lead up to photo resistance ground connection, the plus earth of controllable accurate source of stable pressure;
Described LED lamp parallel circuits comprises the LED series circuit of several roads parallel connection, and wherein, every group of LED series circuit is in series by several LED lamps, wherein, and the minus earth of LED series circuit;
Described the first transistor switching circuit comprises the first triode of a positive-negative-positive, wherein the emitter of the first triode meets VCC, base stage is leaded up to the second resistance and is met VCC, and the 3rd resistance of leading up to connects the negative electrode of controllable accurate source of stable pressure, and the collector electrode of the first triode connects the anode of LED series circuit;
Described the second transistor switching circuit comprises one second triode, and the base stage of described the second triode connects the anode of LED series circuit by the tenth resistance, and emitter meets VCC;
Described three-terminal voltage-stabilizing circuit comprises a voltage stabilizing triode, the wherein collector electrode of input termination second triode of voltage stabilizing triode, and output is by the first capacity earth.
As preferably: described the first triode is S8550 triode.
As preferably: described the second triode is to be the S8550 triode of positive-negative-positive or the S8050 triode of NPN knot.
As preferably: described voltage stabilizing triode is 78L05.
As preferably: described controllable accurate source of stable pressure is TL431 chip.
As preferably: in LED lamp parallel circuits, LED series circuit Wei Liu road, the LED lamp of every road series connection is 7.
As preferably: also comprise a 3P needle stand, three pins of described 3P needle stand connect respectively the output of voltage stabilizing triode in VCC, GND and three-terminal voltage-stabilizing circuit.
Compared with prior art, the utility model has the advantage of: light-operated circuit is exposed to video camera outside, is set directly on infrared light board, it is more accurate to control, and can not produce error, simultaneously, simplify circuit, made circuit simpler, easy to maintenance and maintenance cost is cheap.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
Embodiment 1: referring to Fig. 1, a kind of light-operated LED infrared lamp circuit, be arranged on the infrared light board of video camera, comprise the three end adjustable reference circuit, LED lamp parallel circuits, the first transistor switching circuit, the second transistor switching circuit and the three-terminal voltage-stabilizing circuit that connect successively;
Described three end adjustable reference circuit comprise a controllable accurate source of stable pressure, and the reference utmost point of described controllable accurate source of stable pressure is leaded up to the first resistance R 1 and met VCC, lead up to photosensitive resistor rp H ground connection, the plus earth of controllable accurate source of stable pressure;
Described LED lamp parallel circuits comprises the LED series circuit of several roads parallel connection, and wherein, every group of LED series circuit is in series by several LED lamps, wherein, and the minus earth of LED series circuit;
Described the first transistor switching circuit comprises the first triode T1 of a positive-negative-positive, wherein the emitter of the first triode T1 meets VCC, base stage is leaded up to the second resistance and is met VCC, the 3rd resistance R 3 of leading up to connects the negative electrode of controllable accurate source of stable pressure, and the collector electrode of the first triode connects the anode of LED series circuit;
Described the second transistor switching circuit comprises one second triode T2, and the base stage of described the second triode T2 connects the anode of LED series circuit by the tenth resistance R 10, and emitter meets VCC;
Described three-terminal voltage-stabilizing circuit comprises a voltage stabilizing triode, the wherein collector electrode of the input termination second triode T2 of voltage stabilizing triode, and output is by the first capacitor C 1 ground connection.
The utility model also comprises a 3P needle stand J1, and three pins of described 3P needle stand J1 connect respectively the output of voltage stabilizing triode in VCC, GND and three-terminal voltage-stabilizing circuit.
In the present embodiment, described the first triode T1 is S8550 triode, described the second triode T2 is to be the S8550 triode of positive-negative-positive or the S8050 triode of NPN knot, described voltage stabilizing triode is 78L05, described controllable accurate source of stable pressure is TL431 chip, in LED lamp parallel circuits, LED series circuit Wei Liu road, the LED lamp of every road series connection is 7.
The reference voltage that the controllable accurate source of stable pressure TL431 chip internal of three end adjustable reference circuit contains a 2.5V, so when in the time introducing output feedback with reference to utmost point REF end, chip can pass through the shunting from negative electrode to anode wide range, controls output voltage; And the resistance of photosensitive resistor rp H can just change and change along with light luminance, work as incident intensity, resistance reduces, and a little less than incident light, resistance increases.So 12V power supply one is connected, supply voltage is determined, the first resistance R 1 and the dividing potential drop introducing feedback of photosensitive resistor rp H to VCC, only have in the time that the voltage with reference to the utmost point very approaches 2.5V, the anode of TL431 chip just has a stable unsaturation electric current stream negative electrode to be passed through.So daytime, the resistance of photosensitive resistor rp H was smaller, their dividing potential drop, be namely less than 2.5V with reference to utmost point REF end, do not have electric current to pass through; Evening the increasing along with weakening of irradiation light of photosensitive resistor rp H, the voltage of REF end reaches 2.5V, just has electric current to pass through.
LED series circuit Wei Liu road, the LED lamp of every road series connection is 7, the L1 in corresponding diagram 1 is to L42, the negative electrode of LED series circuit is by a current-limiting resistance ground connection, in Fig. 1, the LED lamp of first via series connection is 7, is respectively L1 ~ L7, corresponding current-limiting resistance is the 4th resistance R 4, the like, the LED lamp of the second tunnel series connection is 7, is respectively L8 ~ L14, corresponding current-limiting resistance is the 5th resistance R 5, and the current-limiting resistance that all the other LED series circuits are corresponding is respectively the 6th resistance R 6 ~ nine resistance R 9.
Described the first transistor switching circuit comprises the first triode T1 of a positive-negative-positive, adopts S8550, as follows according to the switch principle of PNP triode:
1. work as the Vc>Vb of pipe, and when Ve>Vb, all positively biased of collector junction and emitter junction, pipe work is in saturation condition, now the tube voltage drop of pipe is about 0.6V, and, collector current depends on collector supply and collector resistance to Ic=Vc/Rc substantially, irrelevant with Ib, be equivalent to a closed switch.
2. work as Vc<Vb, when Ve<Vb, two PN junctions are all reverse-biased, and pipe work is in cut-off state.Now three of pipe equal no currents of electrode.Be equivalent to the switch of a disconnection.
Daytime, incident intensity, TL431 does not have electric current to pass through, and voltage namely 12V is constant.So Vb>Ve is the switch disconnecting, LED lamp does not all work; In evening, the weak TL431 of incident light has electric current to pass through, according to the dividing potential drop Vb=12*R3/ of series circuit (R2+R3) at this moment Vb<Ve be closed switch, LED lamp is all bright.
Described the second transistor switching circuit comprises one second triode T2, and the base stage of described the second triode T2 connects the anode of LED series circuit by the tenth resistance, and emitter meets VCC, and in the time of the asynchronous control of output, with PNP triode S8550, principle is the same.When output when Synchronization Control with NPN triode S8050, its switch principle is contrary with PNP triode, when Ve constant, when Vb has voltage to input, the suitable Closing Switch of Vb>Ve; When Vb does not have voltage input, Vb<Ve is equivalent to the switch disconnecting.
Three-terminal voltage-stabilizing circuit comprises a voltage stabilizing triode 78L05, in the time that the collector electrode of the second triode T2 has electric current output, when some watch-dog video camera needs 5V power supply, just just changes with 78L05.
3P needle stand J1 is mainly used to connect infrared light supply, this be because: brightness in evening is very low, without the video camera of specific function in the time making a video recording night, often cannot effectively work because scene illumination is too low, and in order to realize night vision, mostly adopt at present infrared lamp camera technique, adopt infrared lamp radiation, produce infrared light invisible to the human eye, illumination scenery and environment, be mainly used in common low-light (level) B/W camera, automatically become B/W camera or infrared low-luminance color video camera colored night on daytime, experience the infrared light that surrounding environment reflects and realize night vision.
The utility model is mainly used on video camera, there is following features: 1. automatically control infrared LED lamp switch according to the variation of surrounding environment brightness its day and night, effectively reduce the interference of peripheral environment and the impact of video camera internal circuit, the photographic effect of raising; 2. expose outside a holding wire, namely the end of the Vo in figure, can directly be controlled to the black and white of picture and colored switching, reduces the circuit complexity of the inside, increases reliability; 3. independent infrared lamp control, whole camera circuitry can be simplified to installation and easy to maintenance.
Claims (7)
1. a light-operated LED infrared lamp circuit, it is characterized in that: be arranged on the infrared light board of video camera, comprise the three end adjustable reference circuit, LED lamp parallel circuits, the first transistor switching circuit, the second transistor switching circuit and the three-terminal voltage-stabilizing circuit that connect successively;
Described three end adjustable reference circuit comprise a controllable accurate source of stable pressure, and the reference utmost point of described controllable accurate source of stable pressure is leaded up to the first resistance and met VCC, lead up to photo resistance ground connection, the plus earth of controllable accurate source of stable pressure;
Described LED lamp parallel circuits comprises the LED series circuit of several roads parallel connection, and wherein, every group of LED series circuit is in series by several LED lamps, wherein, and the minus earth of LED series circuit;
Described the first transistor switching circuit comprises the first triode of a positive-negative-positive, wherein the emitter of the first triode meets VCC, base stage is leaded up to the second resistance and is met VCC, and the 3rd resistance of leading up to connects the negative electrode of controllable accurate source of stable pressure, and the collector electrode of the first triode connects the anode of LED series circuit;
Described the second transistor switching circuit comprises one second triode, and the base stage of described the second triode connects the anode of LED series circuit by the tenth resistance, and emitter meets VCC;
Described three-terminal voltage-stabilizing circuit comprises a voltage stabilizing triode, the wherein collector electrode of input termination second triode of voltage stabilizing triode, and output is by the first capacity earth.
2. light-operated LED infrared lamp circuit according to claim 1, is characterized in that: described the first triode is S8550 triode.
3. light-operated LED infrared lamp circuit according to claim 1, is characterized in that: described the second triode is to be the S8550 triode of positive-negative-positive or the S8050 triode of NPN knot.
4. light-operated LED infrared lamp circuit according to claim 1, is characterized in that: described voltage stabilizing triode is 78L05.
5. light-operated LED infrared lamp circuit according to claim 1, is characterized in that: described controllable accurate source of stable pressure is TL431 chip.
6. light-operated LED infrared lamp circuit according to claim 1, is characterized in that: in LED lamp parallel circuits, and LED series circuit Wei Liu road, the LED of every road series connection is 7.
7. light-operated LED infrared lamp circuit according to claim 1, is characterized in that: also comprise a 3P needle stand, three pins of described 3P needle stand connect respectively the output of voltage stabilizing triode in VCC, GND and three-terminal voltage-stabilizing circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320699515.6U CN203691679U (en) | 2013-11-08 | 2013-11-08 | Light-operated LED infrared lamp circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320699515.6U CN203691679U (en) | 2013-11-08 | 2013-11-08 | Light-operated LED infrared lamp circuit |
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| Publication Number | Publication Date |
|---|---|
| CN203691679U true CN203691679U (en) | 2014-07-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320699515.6U Expired - Fee Related CN203691679U (en) | 2013-11-08 | 2013-11-08 | Light-operated LED infrared lamp circuit |
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| CN (1) | CN203691679U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105188231A (en) * | 2015-10-22 | 2015-12-23 | 深圳成光兴光电技术股份有限公司 | LED automatic light supplement lamp control circuit suitable for security camera |
-
2013
- 2013-11-08 CN CN201320699515.6U patent/CN203691679U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105188231A (en) * | 2015-10-22 | 2015-12-23 | 深圳成光兴光电技术股份有限公司 | LED automatic light supplement lamp control circuit suitable for security camera |
| CN105188231B (en) * | 2015-10-22 | 2017-11-10 | 深圳成光兴光电技术股份有限公司 | A kind of LED automatic light-supplementing lamp control circuits suitable for security monitoring video camera |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140702 Termination date: 20151108 |
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| EXPY | Termination of patent right or utility model |