CN101726962B - High-precision auto aperture drive circuit - Google Patents
High-precision auto aperture drive circuit Download PDFInfo
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- CN101726962B CN101726962B CN 200910155245 CN200910155245A CN101726962B CN 101726962 B CN101726962 B CN 101726962B CN 200910155245 CN200910155245 CN 200910155245 CN 200910155245 A CN200910155245 A CN 200910155245A CN 101726962 B CN101726962 B CN 101726962B
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Abstract
The invention discloses a high-precision auto iris drive circuit, mainly comprising an integrated circuit U1, resisters R1, R2, R3 and R4, capacitors C1, C2, C3, C4, C5, C6 and C7, NPN triodes Q1 and Q3, PNP triodes Q2 and Q4 and a connector J1, thus realizing the functions that the auto iris drives the voltage value according to calculation and after quantization, the drive voltage is precisely output after digital-to-analogue conversion, and the iris aperture of the auto iris lens is controlled with high precision, meeting the actual application requirement of the network camera, having the function of quickly closing the driving auto iris lens; and simultaneously, the number of the electronic elements related to the circuit is less, the performance is mature and stable, and can ensure long-term use with no fault.
Description
Technical field
The present invention 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.
Summary of the invention
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 invention provides a kind of high-precision auto iris drive circuit.
The technical solution adopted for the present invention to solve the technical problems 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 invention has the beneficial effects as follows, the method of high-precision auto iris drive circuit of the present invention 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 invention.
Embodiment
High-precision auto iris drive circuit of the present invention 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 1: 1 signal transmission, 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 that the present invention simultaneously adopts 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.
The present invention is further described below in conjunction with drawings and Examples, and it is more obvious that purpose of the present invention 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 invention 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. a high-precision auto iris drive circuit is characterized in that it comprises: 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; 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 meets capacitor C 1, C2, C5 respectively to ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910155245 CN101726962B (en) | 2009-12-10 | 2009-12-10 | High-precision auto aperture drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910155245 CN101726962B (en) | 2009-12-10 | 2009-12-10 | High-precision auto aperture drive circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101726962A CN101726962A (en) | 2010-06-09 |
| CN101726962B true CN101726962B (en) | 2011-11-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910155245 Expired - Fee Related CN101726962B (en) | 2009-12-10 | 2009-12-10 | High-precision auto aperture drive circuit |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102006419B (en) * | 2010-09-17 | 2013-01-02 | 惠州Tcl移动通信有限公司 | Mobile terminal with automatic focusing driving circuit and driving circuit thereof |
| CN106154687A (en) * | 2016-07-19 | 2016-11-23 | 柳州龙辉科技有限公司 | Digital camera aperture drive circuit |
| CN106488142A (en) * | 2016-12-08 | 2017-03-08 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of auto iris signal conversion method and circuit |
| CN106954028B (en) * | 2017-05-09 | 2023-04-25 | 北京旷视科技有限公司 | Automatic aperture driving circuit and electronic device |
-
2009
- 2009-12-10 CN CN 200910155245 patent/CN101726962B/en not_active Expired - Fee Related
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| CN101726962A (en) | 2010-06-09 |
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Granted publication date: 20111109 Termination date: 20191210 |
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