CN103237381A - Optical filter switching circuit and optical filter switching method for infrared monitoring - Google Patents
Optical filter switching circuit and optical filter switching method for infrared monitoring Download PDFInfo
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- CN103237381A CN103237381A CN2013101098356A CN201310109835A CN103237381A CN 103237381 A CN103237381 A CN 103237381A CN 2013101098356 A CN2013101098356 A CN 2013101098356A CN 201310109835 A CN201310109835 A CN 201310109835A CN 103237381 A CN103237381 A CN 103237381A
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Abstract
An optical filter switching circuit for infrared monitoring comprises a photoresistor, a transistor comparator, a transistor memory module, a constant current source, a drive circuit, a current power supply and a plurality of resistors. An optical filter switching method includes the steps of specifying light intensity reference values xlux and ylux respectively corresponding to the day and the dark day, adjusting resistance valve leaded to a circuit of a Vref (voltage reference) node by the constant current source so as to obtain reference voltages Vrefm and Vrefn when the light intensity of the day and the dark day reaches the critical point, comparing working voltage Vcds with the reference voltages through the transistor comparator and automatically performing switching control of an optical filter based on the judgment of the light intensity at a certain time. The optical filter switching circuit and the optical filter switching method for the infrared monitoring has the advantages that service life of the device and an infrared light is prolonged, the circuit is simple, influence coming from external environment light intensity and temperature changes is little, and no misjudgment occurs due to long-time light intensity changes, the optical filter switching circuit and method is provided with hardware memory functions, and right judgment is made to make the switching at dark day and the day.
Description
Technical field
The present invention relates to the technical field of safety monitoring, is a kind of filter commutation circuit and filter changing method of being used for infrared monitoring with high stability, highly integrated, high-intelligentization specifically.
Background technology
Along with the safety precaution industry constantly develops, the continual renovation of technology, the user is to the demand of monitoring in 24 hours round the clock also more strong, and the front end video capture device of therefore being furnished with infrared light supply is also more outstanding at field of video monitoring institute role.For the security product that is used for night monitoring or unglazed environmental monitoring, high definition image quality, high integration, low-light (level), intellectuality and low cost always are that awaits a urgent difficult problem that solves, especially the problems such as image colour cast that cause of infrared light sources, and solve the breakthrough that these difficult problems depend on technology such as filter switching controls.
At present, in international technology category field, filter switching controls technology still needs further perfect, and the filter control switching circuit of the infrared night vision monitoring product of producing on the market has two kinds of schemes.Traditional filter commutation circuit does not have the hardware memory function, there are some to adopt the RC delayed switching circuit, circuit is complicated and influenced by the ambient light Strength Changes, when the intensity variation time is longer, will produce erroneous judgement, circuit stability is low, the disconnected rate height of erroneous judgement, is subject to ambient light intensity and influence of temperature change, infrared lamp frequently open and cause infrared lamp aging fast, the life-span is short, also easily make corresponding mechanical devices wear and aging such as filter, system reliability is low, cost is high.Another commutation circuit adopts single chip machine controlling circuit, though the sort circuit False Rate is lower than tradition, the cost height needs that software program is write, programming, and is not easy to operate during large-scale mass production, increased bigger cost of labor.These factors play great inhibition to the development of infrared photography product, can not realize high reliability, highly integrated, intelligent, automation and low cost in all directions, give the offender with opportunity, therefore be badly in need of research and development and form a cover reliability height, highly integrated, automation, intellectuality, filter commutation circuit cheaply.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of filter commutation circuit and filter changing method of being used for infrared monitoring with high stability, highly integrated, high-intelligentization.
The technical scheme that the present invention takes for the technical problem that exists in the solution known technology is:
Filter commutation circuit for infrared monitoring of the present invention comprises: photo resistance, triode comparator, triode memory module, constant current supply, drive circuit, current and power supply and a plurality of resistance; Wherein photo resistance is connected with the triode comparator with current and power supply VCC, and photo resistance is by a grounding through resistance, produces operating voltage Vcds at an end of photo resistance, and operating voltage Vcds is inputed to the triode comparator; Current and power supply VCC, converge by different resistance between constant current supply and the ground and be connected same node, and generation reference voltage Vref, the resistance of being guided into by constant current supply in the circuit of Vref node is variable resistor, reference voltage Vref inputs to the triode comparator, by the triode comparator above-mentioned operating voltage Vcds and reference voltage Vref are compared, the triode comparator is connected with the triode memory module with drive circuit respectively, the comparative result of above-mentioned Vcds and Vref is sent to drive circuit triode memory module respectively, by drive circuit infrared lamp is carried out corresponding control, the triode memory module is connected with constant current supply, the critical voltage value on memory daytime and night in the triode memory module, constant current supply is corresponding opens forward or backwards in control.
The filter changing method of infrared monitoring of the present invention:
A, the definition daytime and night critical illuminance reference value, be designated as xlux and ylux respectively;
B, respectively corresponding xlux and ylux regulate by constant current supply and guide resistance in the circuit of Vref node into, obtain the reference voltage when daytime and night, illuminance was critical, are designated as Vrefm and Vrefn respectively;
It is invariable that C, current and power supply VCC keep, and when the illuminance in the external world changed, corresponding change took place the resistance of photo resistance, thereby operating voltage Vcds is changed simultaneously;
D, when transfer night daytime to, the resistance of photo resistance increases, and corresponding the diminishing of the numerical value of operating voltage Vcds meeting at this moment, the triode comparator compares at this moment Vcds and Vrefm, and comparative result is transferred to the triode memory module, if Vcds is less than Vrefm, the triode memory module is controlled the reverse opening of constant current supply by the critical voltage value of memory, to increase reference voltage this moment, namely the illuminance reference value xlux on daytime is reduced, voltage after will changing again is transferred to the drive circuit of filter by triode comparison amplifying circuit, and the control filter switches; When transfer daytime night to, the resistance of photo resistance reduces, and the strain of the phase of the numerical value of operating voltage Vcds meeting at this moment is big, the triode comparator compares at this moment Vcds and Vrefn, and comparative result is transferred to the triode memory module, if Vcds greater than Vrefn then the triode memory module forward of controlling constant current supply by the illuminance critical voltage value of memory open, to reduce reference voltage this moment, namely the illuminance reference value ylux on night is raise, voltage after will changing again is transferred to the drive circuit of filter by triode comparison amplifying circuit, and the control filter switches.
Advantage and good effect that the present invention has are:
Filter commutation circuit and filter changing method for infrared monitoring of the present invention, solved and switched the disconnected rate height of erroneous judgement in the monitoring product, reliability and stability is low, technical barriers such as circuit complexity, prolonged the life-span of equipment and infrared lamp greatly, circuit is simple, be subjected to external environment luminous intensity and influence of temperature change little, do not produce erroneous judgement because the intensity variation time is long, has the hardware memory function, can accurately judge and switch on night and daytime, switch fast and stable, has high reliability, high integration, intelligent, advantages such as low cost meet national conditions, are conducive to the traffic in China, security protection, promote in fields such as industrial production.
Description of drawings
Fig. 1 is the schematic diagram of the filter commutation circuit for infrared monitoring of the present invention;
Fig. 2 is the step schematic diagram of the filter changing method for infrared monitoring of the present invention.
Embodiment
It is following that the present invention will be described in detail with reference to drawings and Examples.
Fig. 1 is the schematic diagram of the filter commutation circuit for infrared monitoring of the present invention; Fig. 2 is the step schematic diagram of the filter changing method for infrared monitoring of the present invention.
As shown in Figure 1, the filter commutation circuit for infrared monitoring of the present invention comprises: photo resistance, triode comparator, triode memory module, constant current supply, drive circuit, current and power supply and a plurality of resistance; Wherein photo resistance is connected with the triode comparator with current and power supply VCC, and photo resistance is by a grounding through resistance, produces operating voltage Vcds at an end of photo resistance, and operating voltage Vcds is inputed to the triode comparator; Current and power supply VCC, converge by different resistance between constant current supply and the ground and be connected same node, and generation reference voltage Vref, the resistance of being guided into by constant current supply in the circuit of Vref node is variable resistor, reference voltage Vref inputs to the triode comparator, by the triode comparator above-mentioned operating voltage Vcds and reference voltage Vref are compared, the triode comparator is connected with the triode memory module with drive circuit respectively, the comparative result of above-mentioned Vcds and Vref is sent to drive circuit triode memory module respectively, by drive circuit infrared lamp is carried out corresponding control, the triode memory module is connected with constant current supply, the critical voltage value on memory daytime and night in the triode memory module, constant current supply is corresponding opens forward or backwards in control.
As shown in Figure 2, the filter changing method of infrared monitoring of the present invention may further comprise the steps:
A, the definition daytime and night critical illuminance reference value, be designated as xlux and ylux respectively;
B, respectively corresponding xlux and ylux regulate by constant current supply and guide resistance in the circuit of Vref node into, obtain the reference voltage when daytime and night, illuminance was critical, are designated as Vrefm and Vrefn respectively;
It is invariable that C, current and power supply VCC keep, and when the illuminance in the external world changed, corresponding change took place the resistance of photo resistance, thereby operating voltage Vcds is changed simultaneously;
D, when transfer night daytime to, the resistance of photo resistance increases, and corresponding the diminishing of the numerical value of operating voltage Vcds meeting at this moment, the triode comparator compares at this moment Vcds and Vrefm, and comparative result is transferred to the triode memory module, if Vcds is less than Vrefm, the triode memory module is controlled the reverse opening of constant current supply by the critical voltage value of memory, to increase reference voltage this moment, namely the illuminance reference value xlux on daytime is reduced, voltage after will changing again is transferred to the drive circuit of filter by triode comparison amplifying circuit, and the control filter switches; When transfer daytime night to, the resistance of photo resistance reduces, and the strain of the phase of the numerical value of operating voltage Vcds meeting at this moment is big, the triode comparator compares at this moment Vcds and Vrefn, and comparative result is transferred to the triode memory module, if Vcds greater than Vrefn then the triode memory module forward of controlling constant current supply by the illuminance critical voltage value of memory open, to reduce reference voltage this moment, namely the illuminance reference value ylux on night is raise, voltage after will changing again is transferred to the drive circuit of filter by triode comparison amplifying circuit, and the control filter switches.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention with preferred embodiment openly as above, yet, be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, certainly can utilize the technology contents of announcement to make a little change or modification, become the equivalent embodiment of equivalent variations, be the content that does not break away from technical solution of the present invention in every case, any simple modification that foundation technical spirit of the present invention is done above embodiment, equivalent variations and modification all belong in the scope of technical solution of the present invention.
Claims (2)
1. a filter commutation circuit that is used for infrared monitoring is characterized in that, comprising: photo resistance, triode comparator, triode memory module, constant current supply, drive circuit, current and power supply and a plurality of resistance; Wherein photo resistance is connected with the triode comparator with current and power supply VCC, and photo resistance is by a grounding through resistance, produces operating voltage Vcds at an end of photo resistance, and operating voltage Vcds is inputed to the triode comparator; Current and power supply VCC, converge by different resistance between constant current supply and the ground and be connected same node, and generation reference voltage Vref, the resistance of being guided into by constant current supply in the circuit of Vref node is variable resistor, reference voltage Vref inputs to the triode comparator, by the triode comparator above-mentioned operating voltage Vcds and reference voltage Vref are compared, the triode comparator is connected with the triode memory module with drive circuit respectively, the comparative result of above-mentioned Vcds and Vref is sent to drive circuit triode memory module respectively, by drive circuit infrared lamp is carried out corresponding control, the triode memory module is connected with constant current supply, the critical voltage value on memory daytime and night in the triode memory module, constant current supply is corresponding opens forward or backwards in control.
2. filter changing method based on the filter commutation circuit that is used for infrared monitoring described in the claim 1 may further comprise the steps:
A, the definition daytime and night critical illuminance reference value, be designated as xlux and ylux respectively;
B, respectively corresponding xlux and ylux regulate by constant current supply and guide resistance in the circuit of Vref node into, obtain the reference voltage when daytime and night, illuminance was critical, are designated as Vrefm and Vrefn respectively;
It is invariable that C, current and power supply VCC keep, and when the illuminance in the external world changed, corresponding change took place the resistance of photo resistance, thereby operating voltage Vcds is changed simultaneously;
D, when transfer night daytime to, the resistance of photo resistance increases, and corresponding the diminishing of the numerical value of operating voltage Vcds meeting at this moment, the triode comparator compares at this moment Vcds and Vrefm, and comparative result is transferred to the triode memory module, if Vcds is less than Vrefm, the triode memory module is controlled the reverse opening of constant current supply by the critical voltage value of memory, to increase reference voltage this moment, namely the illuminance reference value xlux on daytime is reduced, voltage after will changing again is transferred to the drive circuit of filter by triode comparison amplifying circuit, and the control filter switches; When transfer daytime night to, the resistance of photo resistance reduces, and the strain of the phase of the numerical value of operating voltage Vcds meeting at this moment is big, the triode comparator compares at this moment Vcds and Vrefn, and comparative result is transferred to the triode memory module, if Vcds greater than Vrefn then the triode memory module forward of controlling constant current supply by the illuminance critical voltage value of memory open, to reduce reference voltage this moment, namely the illuminance reference value ylux on night is raise, voltage after will changing again is transferred to the drive circuit of filter by triode comparison amplifying circuit, and the control filter switches.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310109835.6A CN103237381B (en) | 2013-04-01 | 2013-04-01 | For filter commutation circuit and the filter changing method of infrared monitoring |
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| CN201310109835.6A CN103237381B (en) | 2013-04-01 | 2013-04-01 | For filter commutation circuit and the filter changing method of infrared monitoring |
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| CN103237381B CN103237381B (en) | 2016-04-20 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015149711A1 (en) * | 2014-04-03 | 2015-10-08 | 华为技术有限公司 | Infrared control device and method, and camera |
| CN105389571A (en) * | 2015-12-08 | 2016-03-09 | 东莞市中控电子技术有限公司 | Image acquisition system and image acquisition method |
| CN103702038B (en) * | 2013-12-31 | 2017-04-19 | 浙江宇视科技有限公司 | Dynamic threshold value-based method and device for performing automatic day and night switching |
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| JP2006318337A (en) * | 2005-05-16 | 2006-11-24 | Rohm Co Ltd | Constant current drive circuit, light emission device using the same, and electronic apparatus |
| KR20100121803A (en) * | 2009-05-11 | 2010-11-19 | 전자부품연구원 | Circuit and method for driving light emitting diode(led) |
| CN202019402U (en) * | 2011-04-21 | 2011-10-26 | 杭州亿视电子系统工程有限公司 | Drive circuits for automatic aperture and optical filter switch of monitoring video camera |
| CN102339073A (en) * | 2011-10-31 | 2012-02-01 | 广东本致数码科技有限公司 | Infrared night vision intelligent control circuit of monitoring video camera |
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2013
- 2013-04-01 CN CN201310109835.6A patent/CN103237381B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006318337A (en) * | 2005-05-16 | 2006-11-24 | Rohm Co Ltd | Constant current drive circuit, light emission device using the same, and electronic apparatus |
| KR20100121803A (en) * | 2009-05-11 | 2010-11-19 | 전자부품연구원 | Circuit and method for driving light emitting diode(led) |
| CN202019402U (en) * | 2011-04-21 | 2011-10-26 | 杭州亿视电子系统工程有限公司 | Drive circuits for automatic aperture and optical filter switch of monitoring video camera |
| CN102339073A (en) * | 2011-10-31 | 2012-02-01 | 广东本致数码科技有限公司 | Infrared night vision intelligent control circuit of monitoring video camera |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103702038B (en) * | 2013-12-31 | 2017-04-19 | 浙江宇视科技有限公司 | Dynamic threshold value-based method and device for performing automatic day and night switching |
| WO2015149711A1 (en) * | 2014-04-03 | 2015-10-08 | 华为技术有限公司 | Infrared control device and method, and camera |
| CN105389571A (en) * | 2015-12-08 | 2016-03-09 | 东莞市中控电子技术有限公司 | Image acquisition system and image acquisition method |
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| CN103237381B (en) | 2016-04-20 |
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Address after: 300384 Tianjin Xiqing District Huayuan Industrial Area (outside the ring) 8 hahihua two road. Patentee after: Tiandi Weiye Technology Co., Ltd. Address before: 300384 Tianjin Xiqing District Huayuan new technology Industrial Park (outside the ring) 8 hahihua two road. Patentee before: Tianjin Tiandy Digital Technology Co., Ltd. |