CN201556011U - Auto iris driving circuit for internet protocol camera in safety monitoring field - Google Patents
Auto iris driving circuit for internet protocol camera in safety monitoring field Download PDFInfo
- Publication number
- CN201556011U CN201556011U CN 200920201987 CN200920201987U CN201556011U CN 201556011 U CN201556011 U CN 201556011U CN 200920201987 CN200920201987 CN 200920201987 CN 200920201987 U CN200920201987 U CN 200920201987U CN 201556011 U CN201556011 U CN 201556011U
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- auto iris
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Abstract
The utility model discloses an auto iris driving circuit for an internet protocol camera in a safety monitoring field. The circuit comprises an integrated circuit U1, resistors R1, R2, R3, R4, capacitors C1, C2, C3, C4, C5, C6, C7, NPN type triodes Q1, Q3, PNP type triodes Q2, Q4 and a connector J1. The utility model can output a driving voltage precisely after performing digital-to-analogue conversion on a calculated and quantized voltage value of the auto iris, can precisely control the function of a bore diameter of the auto iris, can meet the actual application requirement of the internet protocol camera and has a function of rapidly closing the lens of the auto iris. The electric elements of the circuit are less and the property is stable so the circuit can be used for a long time without failure.
Description
Technical field
The utility model relates to a kind of auto iris drive circuit of protection and monitor field web camera, relate in particular to a kind of by after the digitized processing, accurate outputting drive voltage, the circuit of the stop opening of High Accuracy Control automatic diaphragm lens.
Background technology
At present, mostly use asic chip as sensor signal aftertreatment ISP compute chip in the web camera of protection and monitor field, therefore control comparator circuit and the integrating circuit that the auto iris circuit all adopts discharge circuit to form, the average of the CVBS signal by output and by the analog reference voltage value of regulating relatively after, come drive motor by integrating circuit, the stop opening of control automatic diaphragm lens.This method because the integrating circuit action has delay, exists response speed slow, and often needs repeatedly relatively could stablize in actual applications, causes occurring the phenomenon of light and shade flicker.The CVBS code book voltage magnitude variable quantity that shows after the brightness influence of experiencing is little, and has the hysteresis characteristic of output, has bigger error in comparator circuit, and the deficiency of above-mentioned existence is to control the defective that the auto iris circuit can't remedy at present.
The utility model content
At existing existing network video camera auto iris circuit exist response speed slowly, the big defective of comparison repeatedly, brightness relative error and the deficiency can't the user freely controlled, the utility model provides a kind of high-precision auto iris drive circuit.
The technical scheme that its technical matters that solves the utility model adopts is: a kind of high-precision auto iris drive circuit, it is mainly by integrated circuit U1, resistance R 1, R2, R3, R4, capacitor C 1, C2, C3, C4, C5, C6, C7, NPN type triode Q1, Q3, positive-negative-positive triode Q2, Q4, connector J1 forms.Processor is connected digital-to-analogue converter ic U1 by the SPI interface with a GPIO interface in this circuit, after integrated circuit U1 carries out digital-to-analog conversion, connects the base stage of positive-negative-positive triode Q2, Q4 respectively, and circuit meets capacitor C 3, C6 respectively to ground; The grounded collector of positive-negative-positive triode Q2, emitter connect the base stage of NPN type triode Q1, and pull-up resistor R1 to 5V power supply, and the collector of NPN type triode Q1 connects the 5V power supply, and emitter is connected to connector J1, and pull down resistor R2 and capacitor C 4 are to ground; The grounded collector of positive-negative-positive triode Q4, emitter connect the base stage of NPN type triode Q3, and pull-up resistor R3 to 5V power supply, and the collector of NPN type triode Q3 connects the 5V power supply, and emitter is connected to connector J1, and pull down resistor R4 and capacitor C 7 are to ground; The 5V power supply meets capacitor C 1, C2, C5 to ground; Connector J1 connects the connecting line of auto iris.
The beneficial effects of the utility model are, the method of high-precision auto iris drive circuit of the present utility model and realization, according to user's computing and quantification back auto iris driving voltage value, accurate outputting drive voltage after digital-to-analog conversion, the circuit of the stop opening of High Accuracy Control automatic diaphragm lens satisfy the practical application request of web camera, and this circuit structure is simple, cost is low, and is stable practical.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
High-precision auto iris drive circuit of the present utility model mainly adopts digital-to-analog conversion to handle, accurately export the driving voltage and the damping voltage of auto iris, the user is according to the post-processing algorithm of sensor signal, getting access to needs to control the driving voltage value of auto iris and the damping magnitude of voltage that auto iris needs when work, use the digital to analog converter of SPI interface, the level value that the user is quantized converts two groups of independently analog voltages to, because the driving force of the simulating signal of this moment is very weak, can't directly drive automatic diaphragm lens, need to use the driving circuit of forming by PNP triode and NPN triode, respectively each group simulating signal is carried out the signal transmission of 1:1, simulating signal after the transmission possesses the driving force of big electric current, can drive the motor of automatic diaphragm lens inside, and the analog signal voltage amplitude that guarantees this big driving force is consistent with the small-signal after the digital-to-analog conversion, therefore the quantification magnitude of voltage of user's setting can be directly reflected on the camera lens of auto iris, reaches fast and the purpose of the stop opening of High Accuracy Control automatic diaphragm lens.The analog-digital chip of the utility model employing simultaneously possesses the function that trigger pip is removed, the user only need produce the trigger pip of a GPIO, all simulation small-signals through analog-digital chip output can be set at 0V immediately, thereby can quick closedown drive automatic diaphragm lens.The electronic devices and components negligible amounts that relates to of this circuit simultaneously, performance is mature and stable, can guarantee that long-term non-fault uses.
Below in conjunction with drawings and Examples the utility model is further specified, it is more obvious that the purpose of this utility model and effect will become.
As shown in Figure 1, the electronic devices and components that the method for a kind of high-precision auto iris drive circuit of the present utility model and realization relates to comprise integrated circuit U1, resistance R 1, R2, R3, R4, capacitor C 1, C2, C3, C4, C5, C6, C7, NPN type triode Q1, Q3, positive-negative-positive triode Q2, Q4, connector J1.The SPI interface of processor output connects digital-to-analogue converter ic U1, and wherein clock signal connects 8 pin of integrated circuit U1, and chip selection signal connects 7 pin of integrated circuit U1, and data-signal connects 9 pin of integrated circuit U1; The GPIO interface of processor output connects 11 pin of integrated circuit U1; 6 pin and 16 pin of integrated circuit U1 connect the 5V power supply, 1 pin ground connection, and 3 pin, 4 pin, 12 pin, 13 pin, 14 pin, 15 pin, 10 pin are unsettled; 2 pin of integrated circuit U1 connect base stage 1 pin of positive-negative-positive triode Q2, and connect capacitor C 3 to ground, the collector 3 pin ground connection of positive-negative-positive triode Q2, emitter 2 pin connect base stage 1 pin of NPN type triode Q1, and through pull-up resistor R1 to 5V power supply, collector 3 pin of triode Q1 connect the 5V power supply, and emitter 2 pin are connected to 2 pin of connector J1, and pull down resistor R2 and capacitor C 4 are to ground; 5 pin of integrated circuit U1 connect base stage 1 pin of positive-negative-positive triode Q4, and connect capacitor C 6 to ground, the collector 3 pin ground connection of positive-negative-positive triode Q4, emitter 5 pin connect base stage 1 pin of NPN type triode Q3, and through pull-up resistor R3 to 5V power supply, collector 3 pin of triode Q3 connect the 5V power supply, and emitter 2 pin are connected to 3 pin of connector J1, and pull down resistor R4 and capacitor C 7 are to ground; The 5V power supply meets capacitor C 1, C2, C5 to ground; 1 pin of connector J1,4 pin, BO1 pin, BO2 pin ground connection, and connect the connecting line of auto iris at last.
Wherein, integrated circuit U1 can select the LTC1665CGN product of Linear Techn Inc. for use, positive-negative-positive triode Q2, Q4 can select the 2SB1197K product of Rohm company for use, NPN type triode Q3, Q4 can select the S8050LT1 product of ONNN company for use, and connector J1 is that common plate is to wiring connector.
Claims (1)
1. the auto iris drive circuit of a protection and monitor field web camera is characterized in that, it comprises: integrated circuit U1, resistance R 1～R4, capacitor C 1～C7, NPN type triode Q1, Q3, positive-negative-positive triode Q2, Q4, connector J1; Wherein, integrated circuit U1 connects the base stage of positive-negative-positive triode Q2 and positive-negative-positive triode Q4 respectively, and the base stage of positive-negative-positive triode Q2 connects capacitor C 3 to ground, and the base stage of positive-negative-positive triode Q4 connects capacitor C 6 to ground; The grounded collector of positive-negative-positive triode Q2, emitter connect the base stage of NPN type triode Q1, and pull-up resistor R1 to 5V power supply, and the collector of NPN type triode Q1 connects the 5V power supply, and emitter is connected to connector J1, and pull down resistor R2 and capacitor C 4 are to ground; The grounded collector of positive-negative-positive triode Q4, emitter connect the base stage of NPN type triode Q3, and pull-up resistor R3 to 5V power supply, and the collector of NPN type triode Q3 connects the 5V power supply, and emitter is connected to connector J1, and pull down resistor R4 and capacitor C 7 are to ground; The 5V power supply connects capacitor C 1, capacitor C 2 and capacitor C 5 respectively to ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920201987 CN201556011U (en) | 2009-12-10 | 2009-12-10 | Auto iris driving circuit for internet protocol camera in safety monitoring field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920201987 CN201556011U (en) | 2009-12-10 | 2009-12-10 | Auto iris driving circuit for internet protocol camera in safety monitoring field |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201556011U true CN201556011U (en) | 2010-08-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200920201987 Expired - Lifetime CN201556011U (en) | 2009-12-10 | 2009-12-10 | Auto iris driving circuit for internet protocol camera in safety monitoring field |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201556011U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104469129A (en) * | 2013-09-25 | 2015-03-25 | 北京环境特性研究所 | Numerical control focusing circuit of monitoring camera |
| TWI502984B (en) * | 2012-11-23 | 2015-10-01 | Vivotek Inc | Webcam driving circuit and method thereof |
-
2009
- 2009-12-10 CN CN 200920201987 patent/CN201556011U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI502984B (en) * | 2012-11-23 | 2015-10-01 | Vivotek Inc | Webcam driving circuit and method thereof |
| CN104469129A (en) * | 2013-09-25 | 2015-03-25 | 北京环境特性研究所 | Numerical control focusing circuit of monitoring camera |
| CN104469129B (en) * | 2013-09-25 | 2017-11-28 | 北京环境特性研究所 | A kind of monitoring camera numerical control autofocus circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20100818 Effective date of abandoning: 20091210 |