CN104883776A - Double control driving technique for industrial film viewer - Google Patents
Double control driving technique for industrial film viewer Download PDFInfo
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- CN104883776A CN104883776A CN201510224555.9A CN201510224555A CN104883776A CN 104883776 A CN104883776 A CN 104883776A CN 201510224555 A CN201510224555 A CN 201510224555A CN 104883776 A CN104883776 A CN 104883776A
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- constant
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- drive control
- double drive
- control technology
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Abstract
The invention provides a double control driving technique combining controlled constant-current power control with PWM control in order to solve a defect that a conventional industrial film viewer just uses a driving manner combining a voltage-stabilizing power with PWM control (here called single control) to adjust light and brightness and thus causes a big luminance difference. By means of the double control driving technique, the maximum brightness of industrial film viewers with same specifications is substantially same and a possibility is provided for the acquisition of a real luminance value and an improvement in the film estimating result accuracy. A specific method and an embodiment are described in figures. The figures are the function constitutional diagrams of the embodiment, wherein a constant-current power supply is a real power product equipped with a control signal input with photoelectric isolation.
Description
Technical field
The present invention relates to industrial nondestructive testing industry.
Background technology
Industrial viewbox as industrial nondestructive testing industry is the equipment commenting sheet, the slice, thin piece commented is exograph, egative film is clapped from the weld seam after metal solder, substantially all adopt a lot of LED (light-emitting diode) as light source at present and be divided into several light-emitting blocks, each block is unified into a road/a string by the LED strip of equal number, simultaneously in equipment, be all designed with MCU (single-chip microcomputer) thus correspondingly have employed stabilized voltage power supply carries out blockette light modulation degree of lightening in conjunction with the mode of PWM (pulse-width modulation) drived control, wherein only have PWM to embody and have drived control effect, namely one heavily control.Though this drived control mode is simple, but there is more serious shortcoming: because its output voltage of stabilized voltage power supply of this kind of equipment of each same specification is identical, under same voltage, LED current has larger discreteness, thus their high-high brightness when pulse duty cycle reaches maximum (100%) and also has larger discreteness, cause high-high brightness to have larger difference, dimming process can only control according to human eye perceives, the intrinsic brilliance of equipment is not known and cause lack objective uniformity, the accuracy of sheet result can be commented to cause corresponding impact on operator like this.
Summary of the invention
The object of the invention is to, for the problems referred to above, propose a kind of double drive control technology on industrial viewbox, make the intrinsic brilliance of this lamp substantially known, accurate brightness value finally can be provided to operating personnel, improve the accuracy commenting sheet result.
For achieving the above object, the technical solution used in the present invention is:
Adopt controlled constant current power supply in conjunction with PWM drived control.
Because the output current of the controlled constant current power supply in this programme (abbreviation constant-current supply) will by MCU control, embody to drive control action, the control action in conjunction with PWM is just called two ore control.
Consider that the LED way be lit when light modulation degree of lightening is unfixing, required electric current also can not fixed thereupon, so can not with common, be exactly the immutable constant-current supply of current setting value, and must be that current setting value can by the constant-current supply of MCU control break.
Below by accompanying drawing and embodiment, technical scheme of the present invention is described in further detail.
Accompanying drawing explanation
Have 2 accompanying drawings, Fig. 1 is general function composition diagram, and Fig. 2 is the function composition diagram of embodiment.
Six functional units are had: the MCU of band modulating output, isolation/amplification, constant-current supply, LED, PWM control switch, current sampling in Fig. 1; Wherein thin real line represents to only have a holding wire, and thick hollow wire list is shown with many parallel signal lines, and LED function unit is then the combination that a multi-string LED connects constant-current supply output altogether.The total current that constant-current supply exports is split into multichannel electric current to LED, is aggregated into again an electric current, is defeated by current sampling unit after PWM control switch.Signal isolation between MCU and constant-current supply adjusts by isolating with amplitude/and amplifying unit completes.
Operation principle is: light whole LED, under pulse duty cycle reaches maximum (100%) situation, allow MCU Real-Time Monitoring LED total current also control the output current of adjustment constant-current supply in time, make the set point that LED total current reaches corresponding, like this because this set point unified just eliminates brightness discreteness, so the industrial viewbox high-high brightness of each same specification just can be basically identical, add other relevant information, its intrinsic brilliance just can be substantially known and no longer do not know.And the electric current when light modulation degree of lightening needed for the LED way being about to light, by MCU change constant-current supply current setting value, make its output current meet required electric current, thus guarantee that LED is working properly.
embodiment
Below in conjunction with Fig. 2, preferred embodiment example of the present invention is described, should be appreciated that preferred embodiment example described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
Existing a kind of constant-current switch power source as commodity, its with an adjustable output current, through the control signal input of Phototube Coupling, can be connected with the modulating output of MCU easily after necessity process.In certain power bracket, it just can directly as a kind of constant-current supply realizing double drive control technology on industrial viewbox.If power is improper, as long as the then simple design adjusting constant-current supply power aspect.
Embodiment represents one realizing method the most easily.
beneficial effect
Use double drive control technology provided by the present invention, just can overcome the shortcoming that existing industrial viewbox luminance difference is large, make the high-high brightness of each same specification industry viewbox basically identical, for finally knowing intrinsic brilliance value, improving and comment the accuracy of sheet result to provide possibility.
Claims (7)
1. the double drive control technology on industrial viewbox, is characterized by: have MCU (single-chip microcomputer) in industrial viewbox.
2. double drive control technology according to claim 1, is characterized by: have PWM (pulse-width modulation) control switch, isolation/amplification, current sampling, these four functional units of constant-current supply in industrial viewbox.
3. double drive control technology according to claim 1, is characterized by: current sampling functional unit contains sampling element, or also has signal amplitude Circuit tuning.
4. double drive control technology according to claim 1, is characterized by: the light source in industrial viewbox is LED.
5. double drive control technology according to claim 1, is characterized by: the driving power of light source is constant-current supply.
6. double drive control technology according to claim 1, is characterized by: constant-current supply is with control signal input.
7. double drive control technology according to claim 1, it is characterized by: MCU accepts the output signal of current sampling functional unit, PWM control switch functional unit and isolation/enlarging function unit all accept the output signal of MCU, and constant-current supply functional unit accepts the output signal of isolation/enlarging function unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510224555.9A CN104883776A (en) | 2015-04-28 | 2015-04-28 | Double control driving technique for industrial film viewer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510224555.9A CN104883776A (en) | 2015-04-28 | 2015-04-28 | Double control driving technique for industrial film viewer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104883776A true CN104883776A (en) | 2015-09-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510224555.9A Pending CN104883776A (en) | 2015-04-28 | 2015-04-28 | Double control driving technique for industrial film viewer |
Country Status (1)
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| CN (1) | CN104883776A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114187882A (en) * | 2021-11-24 | 2022-03-15 | 当趣网络科技(杭州)有限公司 | System and method for adjusting brightness of display screen of projector |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102779755A (en) * | 2011-05-13 | 2012-11-14 | 北大方正集团有限公司 | Method and system for processing semiconductor device |
| CN202663602U (en) * | 2012-05-03 | 2013-01-09 | 常州润泽光能科技有限公司 | Driving power supply dimming circuit of medical LED film viewer |
| US20130249416A1 (en) * | 2012-03-23 | 2013-09-26 | Hsiang-Chen Wu | Power supply system and controlling method |
| US20140333223A1 (en) * | 2013-05-07 | 2014-11-13 | Goodrich Lighting Systems Gmbh | Dimmable led light unit and method of replacing a light unit |
-
2015
- 2015-04-28 CN CN201510224555.9A patent/CN104883776A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102779755A (en) * | 2011-05-13 | 2012-11-14 | 北大方正集团有限公司 | Method and system for processing semiconductor device |
| US20130249416A1 (en) * | 2012-03-23 | 2013-09-26 | Hsiang-Chen Wu | Power supply system and controlling method |
| CN202663602U (en) * | 2012-05-03 | 2013-01-09 | 常州润泽光能科技有限公司 | Driving power supply dimming circuit of medical LED film viewer |
| US20140333223A1 (en) * | 2013-05-07 | 2014-11-13 | Goodrich Lighting Systems Gmbh | Dimmable led light unit and method of replacing a light unit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114187882A (en) * | 2021-11-24 | 2022-03-15 | 当趣网络科技(杭州)有限公司 | System and method for adjusting brightness of display screen of projector |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150902 |
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| WD01 | Invention patent application deemed withdrawn after publication |