CN205610986U - LED operating circuit and production control system thereof - Google Patents
LED operating circuit and production control system thereof Download PDFInfo
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- CN205610986U CN205610986U CN201620298016.XU CN201620298016U CN205610986U CN 205610986 U CN205610986 U CN 205610986U CN 201620298016 U CN201620298016 U CN 201620298016U CN 205610986 U CN205610986 U CN 205610986U
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Abstract
The utility model provides a LED operating circuit and production control system thereof, this LED operating circuit includes the LED lamp, the positive pole of LED lamp links to each other with fixed driving voltage positive terminal, the negative pole of LED lamp links to each other with the collecting electrode of triode, a LED lamp and a resistor parallel with, the projecting pole of triode is through the 2nd grounding, the base of triode links to each other with MCU, the PWM signal has been predetermine in the MCU, MCU sends predetermined PWM signal to the base of triode, control switching on and ending of triode, realize the control of LED work. The utility model discloses under the fixed driving voltage condition, the control mode that adopts current -limiting resistor and PWM to contact, PWM's default is accomplished the product rolls off the production line before and is predetermine, has both guaranteed that PWM controls the lower high advantage of LED luminance uniformity, and colourity is stabilized, simultaneously, overcome fixed PWM to the harsh requirement of LED highly uniform nature, it is with low costs.
Description
Technical field
This utility model relates to LED illumination optical path adjusting and control of product quality technical field, is specifically related to
A kind of LED light path adjusted design and produce control process, be particularly well-suited to vehicle mounted multimedia product by
Key backlight.
Background technology
Along with commonly using of LED, the particularly popularization and application in the media products such as automobile, city
For the raising of prescription of product, to the brightness of body light light and the conforming requirement of colourity increasingly
High.
At present, in low-end product to the coherence request of lamplight brightness and chromaticity coordinates relatively low in the case of, generally
Use series limiting resistor and LED (light emitting diode, light emitting under the conditions of fixed driving voltage
Diode) type of drive, adopts low cost in this way, but lamplight brightness and chromaticity coordinates is inconsistent,
The total quality of light fixture is poor.
In requiring slightly higher application, have employed PWM (pulse width modulation, Pulse Width
Modulation) mode regulated regulates brightness and selects the high LED of coherence request, this side
Formula PWM duty cycle is fixed, and the coherence request of LED is higher, causes that LED's is relatively costly.
Utility model content
In order to overcome defect present in above-mentioned prior art, the purpose of this utility model is to provide a kind of LED
Operating circuit and LED production control system, overcome existing fixing pwm signal dutycycle to fix and thus
The problem high to highly consistent caused LED costs of parameter such as LED luminance chromaticity coordinates.
For realizing above-mentioned purpose of the present utility model, according to first aspect of the present utility model, this practicality is new
Type provides a kind of LED operation circuit, and it includes that LED, the positive pole of described LED are driven with fixing
Galvanic electricity positive pressure is the most connected, and the negative pole of described LED is connected with the colelctor electrode of audion, described LED
With the first resistor coupled in parallel, the emitter stage of described audion passes through the second resistance eutral grounding, the base stage of described audion
It is connected with MCU (micro-control unit, Microcontroller Unit), in described MCU, is preset with PWM
Signal, described MCU sends the pwm signal preset to the base stage of audion, controls the conducting of audion
With cut-off, it is achieved the control of LED operation.
This utility model, in the case of fixed driving voltage, uses the control that current-limiting resistance and PWM engage
Mode, both ensure that PWM controlled the advantage that lower LED luminance concordance is high, chroma stability；PWM's
Preset value completes to preset before product rolls off the production line, and by test.Ensure that the quality of product.
In a kind of preferred implementation of the present utility model, described first resistance is not in parallel with LED,
But be serially connected between LED negative pole and transistor collector.
This utility model both can use regulative mode in series with a resistor for LED, flexible design.
For realizing above-mentioned purpose of the present utility model, according to first aspect of the present utility model, this practicality is new
Type provides a kind of LED operation circuit production control system, and it includes LED operation circuit part and production
Control part；Described LED operation circuit part includes LED, and the positive pole of described LED is with fixing
Driving voltage positive terminal is connected, and the negative pole of described LED is connected with the colelctor electrode of audion, described LED
Lamp and the first resistor coupled in parallel, the emitter stage of described audion passes through the second resistance eutral grounding, the base of described audion
Pole is connected with MCU, and described MCU sends pwm signal to the base stage of audion, controls audion
Conducting and cut-off；Described production controlling part divides and includes processor and luminance test system, and described processor is respectively
Being connected with luminance test system and MCU, the brightness of LED is measured by described luminance test system,
And the data recorded are sent to processor, processor compares the brightness of LED with brightness set in advance also
Send PWM to MCU and regulate signal, the output of regulation pwm signal.
LED operation circuit production control system of the present utility model presets suitable PWM letter in MCU
Number, it is ensured that LED operation circuit part normally works.
In a kind of preferred implementation of the present utility model, described processor includes memorizer, described in deposit
Reservoir internal memory contains brightness preset value, and processor is connected with the outfan of luminance test system, works as input processing
When the luminance signal of device is less than preset value, processor outfan output PWM duty cycle tunes up signal；When bright
When degree signal is more than preset value, processor outfan output PWM duty cycle turns signal down；Work as luminance signal
During equal to preset value, processor outfan output storage signal, MCU is to current PWM duty cycle ginseng
Number preserves.
Processor of the present utility model is according to the comparative result regulation PWM of LED luminance signal with preset value
The dutycycle of signal, when LED luminance signal is identical with preset value, MCU is to current PWM duty
Preserve than parameter, it is ensured that during the work of LED operation circuit part, LED is attained by the brightness of regulation.
In another kind of preferred implementation of the present utility model, also include voltage test module, described voltage
The test probe of test module and the positive pole of the second resistance can be electrically connected, the test probe of voltage test module
Detecting the voltage of the positive pole of the second resistance, the outfan of described voltage test module is connected with processor, processes
Device receives voltage tester value and compares with preset value, is judged to qualified products, preset value below preset value
More than it is judged to substandard product and sends alarm signal.
By voltage test module, test the voltage of the second resistance, and then obtain the operating current of LED,
Screen out the LED that operating current is big, it is ensured that service life.
In yet another preferred form of the present utility model, also include alarm module, described alarm module
Outfan be connected with qualified/non-qualified products outfan of processor, when processor judges that LED is non-conjunction
During lattice product, processor sends working signal to alarm module, and alarm module is reported to the police.
Send alarm signal by alarm module, improve the convenience detecting non-qualified products.
Additional aspect of the present utility model and advantage will part be given in the following description, and part will be from following
Description in become obvious, or recognized by practice of the present utility model.
Accompanying drawing explanation
Embodiment is retouched by above-mentioned and/or additional aspect of the present utility model and advantage from combining accompanying drawings below
Will be apparent from easy to understand in stating, wherein:
Fig. 1 is the electrical block diagram of LED operation circuit in a kind of preferred implementation of this utility model；
Fig. 2 is the showing of LED operation circuit production control system in a kind of preferred implementation of this utility model
It is intended to.
Detailed description of the invention
Of the present utility model embodiment is described below in detail, and the example of described embodiment is shown in the drawings, its
In the most same or similar label represent same or similar element or there is same or like function
Element.The embodiment described below with reference to accompanying drawing is exemplary, is only used for explaining this utility model,
And it is not intended that to restriction of the present utility model.
In description of the present utility model, unless otherwise prescribed and limit, " the peace it should be noted that term
Dress ", should be interpreted broadly " being connected ", " connection ", for example, it may be mechanical connection or electrically connect, it is possible to
To be the connection of two element internals, can be to be joined directly together, it is also possible to be indirectly connected to by intermediary,
For the ordinary skill in the art, specifically containing of above-mentioned term can be understood as the case may be
Justice.
This utility model, under conditions of using fixed driving voltage, uses LED strip connection resistance and PWM
The control mode that regulation combines.
This utility model provides a kind of LED operation circuit, as it is shown in figure 1, it includes LED, LED
Lamp uses fixed driving voltage to power, and the positive pole of LED is connected with fixed driving voltage positive terminal, LED
The negative pole of lamp is connected with the colelctor electrode of audion.In the present embodiment, LED and the first resistor coupled in parallel,
The emitter stage of audion passes through the second resistance eutral grounding.In the preferred implementation that this utility model is other,
LED and the first resistant series, the colelctor electrode of the first resistance connecting triode, the emitter stage of audion leads to
Cross the second resistance eutral grounding.
The base stage of audion is connected with MCU, is preset with pwm signal in MCU, and MCU is to audion
Base stage send the pwm signal preset, control the conducting of audion and cut-off, it is achieved LED operation
Control.
In the present embodiment, the first resistance can be in parallel with LED, it is also possible to is serially connected in LED and bears
Between pole and transistor collector.This utility model both can use regulative mode in series with a resistor for LED,
Regulative mode in parallel with a resistor, flexible design can also be used.
This utility model, in the case of fixed driving voltage, uses the control that current-limiting resistance and PWM engage
Mode, both ensure that PWM controlled the advantage that lower LED luminance concordance is high, chroma stability；Meanwhile,
Pwm signal is preset signals, overcomes regulation problem costly, low cost in real time.
Based on above LED operation circuit, this utility model provides a kind of LED operation circuit and produces control
System, as in figure 2 it is shown, it includes that LED operation circuit part and production controlling part divide.
Concrete LED operation circuit part uses the structure that this utility model is above-mentioned, and therefore not to repeat here.
Production controlling part divides and includes processor and luminance test system, processor respectively with luminance test system and
MCU is connected, and the brightness of LED is measured by luminance test system, and the data recorded is transmitted everywhere
Reason device, processor compares the brightness of LED and sends PWM regulation with brightness set in advance and to MCU
Signal, the output of regulation pwm signal.LED operation circuit production control system of the present utility model to
Suitable pwm signal is preset, it is ensured that LED operation circuit part normally works in MCU.
In the present embodiment, processor includes that memorizer, memorizer internal memory contain brightness preset value, place
Reason device is connected with the outfan of luminance test system, when the luminance signal of input processor is less than preset value,
Processor outfan output PWM duty cycle tunes up signal；When luminance signal is more than preset value, processor
Outfan output PWM duty cycle turns signal down；When luminance signal is equal to preset value, processor outfan
Output storage signal, current PWM duty cycle parameter is preserved by MCU.
In the present embodiment, the regulation PWM duty cycle signal of concrete processor output can use existing
Step-by-step adjustment method.
Processor of the present utility model is according to the comparative result regulation PWM of LED luminance signal with preset value
The dutycycle of signal, when LED luminance signal is identical with preset value, MCU is to current PWM duty
Preserve than parameter, it is ensured that during the work of LED operation circuit part, LED is attained by the brightness of regulation.
In the present embodiment, also include voltage test module, the test probe of voltage test module and second
The positive pole of resistance can be electrically connected, the positive pole of test probe in detecting second resistance of described voltage test module
Voltage, the outfan of voltage test module is connected with processor, and processor receives voltage tester value and with default
Value compares, and is judged to qualified products below preset value, more than preset value is judged to that substandard product is concurrent
Go out alarm signal.By voltage test module, test the voltage of the second resistance, and then obtain LED
Operating current, screens out the LED that operating current is big, it is ensured that service life.
In the present embodiment, alarm module, the outfan of described alarm module and the conjunction of processor are also included
Lattice/non-qualified products outfan is connected, and when processor judges that LED is non-qualified products, processor is to police
Showing that module sends working signal, alarm module is reported to the police.Send alarm signal by alarm module, improve inspection
Go out the convenience of non-qualified products.
In a kind of preferred implementation of the present utility model, main working process is:
1, for the LED operation power on circuitry assembled.
2, in MCU uses it, parameter set in advance carries out the output of PWM ripple, and triode ON will
LED lights.
3, the brightness of LED is measured by luminance test system, and is sent to the data recorded process
Device.Brightness and the luminance parameter set in advance of LED are contrasted and make and feed back to MCU by processor,
Specifically can be, but not limited to use comparator that the brightness of LED is contrasted with luminance parameter set in advance
And make feedback signal.
5, MCU receiving feedback information, adjusts PWM ripple duty cycle adjustment LED luminance.Brightness is surveyed
Test system test brightness again carries out differentiating and feeding back again testing, until LED luminance reaches default bright
Degree requirement.
6, voltage test module is sent to by the voltage at probe probing test point test2, fall magnitude of voltage
Processor, magnitude of voltage is judged by processor, and magnitude of voltage is judged to qualified products below preset value,
Current PWM duty cycle parameter is preserved by MCU.Magnitude of voltage, not above preset value, is higher than
Preset value explanation is flow through the electric current of LED and be can be only achieved more greatly the requirement brightness of setting, and bigger electric current will
Affect the life-span of LED, affect the service life of product.Test system by pointing out and will judge product
Defective and carry out early warning by early warning system.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ",
The description of " concrete example " or " some examples " etc. means to combine the concrete spy of this embodiment or example description
Levy, structure, material or feature are contained at least one embodiment of the present utility model or example.At this
In description, the schematic representation of above-mentioned term is not necessarily referring to identical embodiment or example.And,
The specific features, structure, material or the feature that describe can be in any one or more embodiments or examples
In combine in an appropriate manner.
Embodiment the most of the present utility model, those of ordinary skill in the art is permissible
Understand: can these embodiments be carried out multiple in the case of without departing from principle of the present utility model and objective
Changing, revise, replace and modification, scope of the present utility model is limited by claim and equivalent thereof.
Claims (7)
1. a LED operation circuit, it is characterised in that include LED, the positive pole of described LED
Being connected with fixed driving voltage positive terminal, the negative pole of described LED is connected with the colelctor electrode of audion, institute
Stating LED and the first resistor coupled in parallel, the emitter stage of described audion passes through the second resistance eutral grounding, and described three
The base stage of pole pipe is connected with MCU, is preset with pwm signal in described MCU, and described MCU is to three
The base stage of pole pipe sends the pwm signal preset, and controls conducting and the cut-off of audion, it is achieved LED work
The control made.
2. LED operation circuit as claimed in claim 1, it is characterised in that described first resistance is not
In parallel with LED, but be serially connected between LED negative pole and transistor collector.
3. a LED operation circuit production control system, it is characterised in that include LED operation circuit
Part and production controlling part divide；
Described LED operation circuit part includes LED, the positive pole of described LED and fixed drive electricity
Positive pressure is the most connected, and the negative pole of described LED is connected with the colelctor electrode of audion, described LED and the
One resistor coupled in parallel, the emitter stage of described audion pass through the second resistance eutral grounding, the base stage of described audion with
MCU is connected, and described MCU sends pwm signal to the base stage of audion, controls the conducting of audion
With cut-off；
Described production controlling part divides and includes processor and luminance test system, and described processor is surveyed with brightness respectively
Test system is connected with MCU, and the brightness of LED is measured by described luminance test system, and will record
Data be sent to processor, processor compares the brightness of LED and brightness set in advance and to MCU
Send PWM and regulate signal, the output of regulation pwm signal.
4. LED operation circuit production control system as claimed in claim 3, it is characterised in that described
First resistance is not in parallel with LED, but is serially connected between LED negative pole and transistor collector.
5. LED operation circuit production control system as claimed in claim 3, it is characterised in that described
Processor includes that memorizer, described memorizer internal memory contain brightness preset value, processor and luminance test system
The outfan of system is connected, and when the luminance signal of input processor is less than preset value, processor outfan exports
PWM duty cycle tunes up signal；When luminance signal is more than preset value, processor outfan output PWM
Dutycycle turns signal down；When luminance signal is equal to preset value, processor outfan output storage signal,
Current PWM duty cycle parameter is preserved by MCU.
6. LED operation circuit production control system as claimed in claim 3, it is characterised in that also wrap
Include voltage test module, the voltage of the positive pole of test probe in detecting second resistance of described voltage test module,
The outfan of described voltage test module is connected with processor, and processor receives voltage tester value and preset value
Compare, below preset value, be judged to qualified products, more than preset value be judged to substandard product.
7. LED operation circuit production control system as claimed in claim 6, it is characterised in that also wrap
Including alarm module, the outfan of described alarm module is connected with qualified/non-qualified products outfan of processor,
When processor judges that LED is non-qualified products, processor sends working signal to alarm module, warning
Module is reported to the police.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620298016.XU CN205610986U (en) | 2016-04-11 | 2016-04-11 | LED operating circuit and production control system thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620298016.XU CN205610986U (en) | 2016-04-11 | 2016-04-11 | LED operating circuit and production control system thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205610986U true CN205610986U (en) | 2016-09-28 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620298016.XU Active CN205610986U (en) | 2016-04-11 | 2016-04-11 | LED operating circuit and production control system thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116456538A (en) * | 2023-06-15 | 2023-07-18 | 深圳市美矽微半导体有限公司 | LED driving chip testing method and LED lamp |
-
2016
- 2016-04-11 CN CN201620298016.XU patent/CN205610986U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116456538A (en) * | 2023-06-15 | 2023-07-18 | 深圳市美矽微半导体有限公司 | LED driving chip testing method and LED lamp |
| CN116456538B (en) * | 2023-06-15 | 2023-08-18 | 深圳市美矽微半导体有限公司 | LED driving chip testing method and LED lamp |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |