CN206196109U - Light guide plate control circuit of luminance linear change - Google Patents
Light guide plate control circuit of luminance linear change Download PDFInfo
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- CN206196109U CN206196109U CN201621276259.XU CN201621276259U CN206196109U CN 206196109 U CN206196109 U CN 206196109U CN 201621276259 U CN201621276259 U CN 201621276259U CN 206196109 U CN206196109 U CN 206196109U
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Abstract
The utility model belongs to the technical field of the aviation machine carries communication equipment, a light guide plate control circuit of luminance linear change is disclosed, include: microprocessor, constant current steady voltage unit and luminescence unit, constant current steady voltage unit contains the steady voltage chip, and the current input of steady voltage chip connects, and the PWM input of steady voltage chip and microprocessor's PWM output are connected, the luminescence unit contains a plurality ofly by an emitting diode and the series branch that the triode is constituteed, and in every series branch, emitting diode's the projecting pole anodal and triode is connected, and emitting diode's negative pole and the current feedback of steady voltage chip end are connected, and the collecting electrode of triode and the current output terminal of steady voltage chip connect, and the base of triode and microprocessor's switching signal output are connected, the utility model discloses can make the linear even change of light of the light guide plate among the aviation machine year communication equipment.
Description
Technical field
The utility model belongs to airborne technical field of communication equipment, and what more particularly to a kind of brightness linear changed leads
Tabula rasa controls circuit.
Background technology
In airborne communication equipment, light guide plate backlight and indicator lamp brightness it is adjustable be a weight of the aircraft in night flight
Want condition.When navigating by water at manned vehicle night, the backlight illumination on suitable daytime just seems and especially pierce on light guide plate and indicator lamp
Eye, it is therefore desirable to be adjusted to light guide plate luminance.The backlight circuit of light guide plate generally uses light emitting diode string, light-emitting diodes
The brightness of pipe is to be directly proportional to size of current.It is general on current manned vehicle to be gone here and there on the light emitting diode of light guide plate
Connection or an adjustable potentiometer in parallel, by the size for adjusting the resistance of adjustable potentiometer to change electric current on circuit, so that real
The change of existing light guide plate backlight illumination.But in the first half term adjusted with adjustable potentiometer, the brightness of light guide plate is varied less, and is arrived
During the second half, occur the rapidly dimmed phenomenon of light guide plate again, cause during the entire process of regulation, the light of light guide plate becomes
Change uneven.
Utility model content
The purpose of this utility model is to provide a kind of light guide plate control circuit of brightness linear change, solves prior art
Present in adjustable potentiometer adjust light guide plate backlight illumination when, the brightness of first half term light guide plate is varied less, and the second half is but
Rapidly dimmed phenomenon occurs, causes the light of light guide plate to change uneven problem.
In order to achieve the above object, the utility model is achieved using following technical scheme.
A kind of light guide plate control circuit of brightness linear change, including：Microprocessor, constant-current voltage-stabilizing unit and luminous list
Unit, constant-current voltage-stabilizing unit includes voltage stabilizing chip, and the current input terminal and power supply of voltage stabilizing chip are connected, the PWM inputs of voltage stabilizing chip
The PWM output ends of end and microprocessor are connected；
Luminescence unit includes multiple series arms being made up of a light emitting diode and a triode, in each series connection
In branch road, the emitter stage connection of the positive pole of light emitting diode and triode, the negative pole of light emitting diode and the electric current of voltage stabilizing chip
Feedback end is connected, the current output terminal connection of the colelctor electrode of triode and voltage stabilizing chip, the base stage of triode and microprocessor
Switching signal output end is connected.
Preferably, the constant-current voltage-stabilizing control unit also includes：First electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electricity
Appearance, first resistor, second resistance, inductance and commutation diode；Wherein, the first end of the first electric capacity respectively with power supply, first electricity
The current input terminal connection of the first end of resistance and the voltage stabilizing chip, the second end ground connection of the first electric capacity, the second of first resistor
The time control end of end and the voltage stabilizing chip connects；Drive leading end and second electric capacity the first of the voltage stabilizing chip
End connection, the second end of the second electric capacity connects with the first end of the negative pole of the commutation diode, the inductance respectively, described whole
Flow the plus earth of diode；The current output terminal of the voltage stabilizing chip the second end respectively with second electric capacity, inductance
The negative pole connection of first end and commutation diode, the second end of inductance respectively with the first end of the 4th electric capacity, each described three pole
The colelctor electrode connection of pipe, the first end connection at second end and second resistance of the 4th electric capacity, the second end ground connection of second resistance；Institute
State the current feedback terminal of voltage stabilizing chip first end respectively with the second resistance, the second end of the 4th electric capacity and each described hair
The negative pole connection of optical diode；The inner linear voltage adjustment output end and the first end of the 3rd electric capacity of the voltage stabilizing chip
Connection, the second end ground connection of the 3rd electric capacity；The earth terminal ground connection of the voltage stabilizing chip.
Preferably, the triode is NPN type triode.
Preferably, the microprocessor is the microprocessor of STM32F series.
Preferably, the model LM3402 of the voltage stabilizing chip IC.
The beneficial effects of the utility model are to send pwm signal, voltage stabilizing chip pair to voltage stabilizing chip by microprocessor
The electric current of pwm signal is adjusted, electric current, the voltage constant for exporting it, so that into the electricity of each light emitting diode
Stream is constant；The break-make of the electric current of triode is controlled by microprocessor again, multiple light-emitting diode luminances occurs uniform
The pulse width of linear change, i.e. microprocessor output is wider, and light emitting diode is brighter, and pulse width is narrower, light-emitting diodes
Pipe is darker.The utility model is solved when adjusting light guide plate backlight illumination with adjustable potentiometer present in prior art, preceding
The brightness of half way light guide plate is varied less, and the second half but occurs rapidly dimmed phenomenon, causes the light of light guide plate to change not
Uniform problem.
Brief description of the drawings
The utility model is described in detail with reference to the accompanying drawings and detailed description.
Fig. 1 is a kind of structural representation of the light guide plate control circuit of brightness linear change of the present utility model；
Fig. 2 is the constant-current voltage-stabilizing unit of Fig. 1 and the circuit diagram of luminescence unit.
In figure：IC, voltage stabilizing chip；C1, the first electric capacity；C2, the second electric capacity；C3, the 3rd electric capacity；C4, the 4th electric capacity；R1、
First resistor；R2, second resistance；L, inductance；ZD, commutation diode；Q, triode；LED, light emitting diode.
Specific embodiment
Referring to Figures 1 and 2, a kind of light guide plate of brightness linear change of the present utility model controls the structure of circuit, including：
Microprocessor, constant-current voltage-stabilizing unit and luminescence unit.
Constant-current voltage-stabilizing control unit includes：Voltage stabilizing chip IC, the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the 4th
Electric capacity C4, first resistor R1, second resistance R2, inductance L and commutation diode ZD, wherein, the current input terminal of voltage stabilizing chip IC
(i.e. VIN pins) is connected with the first end of power supply, the first end of the first electric capacity C1 and first resistor R1 respectively, the first electric capacity C1's
Second end is grounded；The second end connection at the time control end (i.e. RON pins) and first resistor R1 of voltage stabilizing chip IC；Voltage stabilizing chip
The PWM output ends connection of the PWM inputs (i.e. DIM pins) and microprocessor of IC；The driving leading end of voltage stabilizing chip IC is (i.e.
BOOT pins) and the second electric capacity C2 first end connection, second end of the second electric capacity C2 respectively with the negative pole of commutation diode ZD
Connection, the first end connection of inductance L, the plus earth of commutation diode ZD；(i.e. SW is managed the current output terminal of voltage stabilizing chip IC
Pin) connected with the negative pole at second end, the first end of inductance L and commutation diode ZD of the second electric capacity C2 respectively, the second of inductance L
The positive pole connection of end first end respectively with the 4th electric capacity C4, the input of luminescence unit, second end of the 4th electric capacity C4 and the
The first end connection of two resistance R2, the second end ground connection of second resistance R2；The current feedback terminal (i.e. CS pins) of voltage stabilizing chip IC
The negative pole connection of first end, second end of the 4th electric capacity C4 and luminescence unit input respectively with second resistance R2；Voltage stabilizing core
The first end connection of the inner linear voltage adjustment output end and the 3rd electric capacity C3 of piece IC, the second end ground connection of the 3rd electric capacity C3；
Earth terminal (the i.e. GND pins) ground connection of voltage stabilizing chip IC.Wherein, the shunt capacitance that functions as of the first electric capacity C1 will be input into surely
Radio-frequency component in the electric current of pressure chip IC current input terminal (i.e. VIN pins) is filtered；Second electric capacity C2 is a feedback capacity,
AC noise in output current is imported into the driving leading end (i.e. BOOT pins) of voltage stabilizing chip IC；The work of the 3rd electric capacity C3
With being that the inner linear voltage of voltage stabilizing chip IC is adjusted into the radio-frequency component in the output current of output end to filter；4th electric capacity C4
Function as decoupling radio station the HFS of output signal is filtered；The effect of inductance L is to make outputting current steadily, will not
Generation instantaneous variation.
Wherein, the full name of PWM be Pulse Width Modulation (i.e.：Pulse width modulation).Voltage stabilizing chip IC's
Model is LM3402, and the chip is a voltage-dropping type voltage stabilizing chip as derived from controllable current source, can drive series connection it is high-power,
High brightness LED string, can receive input voltage of the scope in 6~42V.
Luminescence unit includes multiple series arms being made up of a LED and a triode Q, at each
In series arm, the emitter stage connection of the positive pole of LED and triode Q, the negative pole of LED and voltage stabilizing
Current feedback terminal (the i.e. CS pins) connection of chip IC, the colelctor electrode of triode Q and current output terminal (the i.e. SW of voltage stabilizing chip IC
Pin) connection, the switching signal output end connection of the base stage and microprocessor of triode Q.
Specifically, microprocessor is the microprocessor of STM32F series；(pulse is wide for adjusting pwm signal for microprocessor
Degree modulated signal) dutycycle (ratio i.e. between square wave high level time and low level time), and by after regulation PWM letter
Number it is sent to voltage stabilizing chip IC；Microprocessor sends the PWM of different in width according to the quantity of LED, and uniformly changes
Become the dutycycle of pwm signal (pulse width modulating signal), change the brightness uniformity of LED, so that guide-lighting
Backboard brightness also even variation；Microprocessor is additionally operable to transmission switching signal and gives triode Q, so as to control light emitting diode
The light on and off of LED.
Voltage stabilizing chip IC, the pwm signal for receiving microprocessor transmission, and PWM electric currents to receiving are adjusted,
Make the electric current of output constant, actual current accounts for the ratio of setting electric current value depending on the dutycycle of PWM.The model of voltage stabilizing chip IC
It is LM3402, high-power, high brightness the light emitting diode string of series connection can be driven, input electricity of the scope in 6V-42V can be received
Pressure.
Triode Q, the switching signal for receiving microprocessor transmission, when the switch controlling signal for receiving is (electricity high
Pressure is more than 1.7V) when, the collector and emitter connection of triode Q has electric current to pass through, and lights corresponding LED.
The light guide plate control circuit of brightness linear change of the present utility model, is sent by microprocessor to voltage stabilizing chip IC
Pwm signal, voltage stabilizing chip IC is adjusted to the electric current of pwm signal, electric current, the voltage constant for exporting it, so that into
The electric current of each LED is constant；The break-make of the electric current of triode Q is controlled by microprocessor again, makes multiple
There is uniform linear change in LED brightness, i.e. the pulse width of microprocessor output is wider, and light emitting diode is just
Brighter, pulse width is narrower, and light emitting diode is darker.The utility model is solved uses adjustable potential present in prior art
During device regulation light guide plate backlight illumination, the brightness of first half term light guide plate is varied less, and the second half but occurs rapidly dimmed showing
As causing the light of light guide plate to change uneven problem.
Above content is to combine specific preferred embodiment further detailed description of the utility model, it is impossible to
Assert that specific implementation of the present utility model is confined to these explanations.For the ordinary skill of the utility model art
For personnel, without departing from the concept of the premise utility, some simple deduction or replace can also be made, should all regarded
To belong to protection domain of the present utility model.
Claims (5)
1. a kind of light guide plate of brightness linear change controls circuit, it is characterised in that including：Microprocessor, constant-current voltage-stabilizing unit
And luminescence unit, constant-current voltage-stabilizing unit includes voltage stabilizing chip, and the current input terminal and power supply of voltage stabilizing chip are connected, voltage stabilizing chip
The PWM output ends connection of PWM inputs and microprocessor；
The luminescence unit includes multiple series arms being made up of a light emitting diode and a triode, in each series connection
In branch road, the emitter stage connection of the positive pole of light emitting diode and triode, the negative pole of light emitting diode and the electric current of voltage stabilizing chip
Feedback end is connected, the current output terminal connection of the colelctor electrode of triode and voltage stabilizing chip, the base stage of triode and microprocessor
Switching signal output end is connected.
2. the light guide plate of brightness linear change according to claim 1 controls circuit, it is characterised in that the constant-current voltage-stabilizing
Control unit also includes：First electric capacity (C1), the second electric capacity (C2), the 3rd electric capacity (C3), the 4th electric capacity (C4), first resistor
(R1), second resistance (R2), inductance (L) and commutation diode (ZD)；Wherein, the first end of the first electric capacity (C1) respectively with electricity
The current input terminal connection in source, the first end of first resistor (R1) and the voltage stabilizing chip, the second termination of the first electric capacity (C1)
Ground, the time control end connection at second end and the voltage stabilizing chip of first resistor (R1)；The driving guiding of the voltage stabilizing chip
The first end of end and second electric capacity (C2) is connected, the second end of the second electric capacity (C2) respectively with the commutation diode (ZD)
Negative pole, the inductance (L) first end connection, the plus earth of the commutation diode (ZD)；The electricity of the voltage stabilizing chip
Stream output end respectively with the negative pole at second end, the first end of inductance (L) and commutation diode (ZD) of second electric capacity (C2)
Connection, the colelctor electrode connection of the second end of inductance (L) first end, each triode respectively with the 4th electric capacity (C4), the
The first end connection at second end and second resistance (R2) of four electric capacity (C4), the second end ground connection of second resistance (R2)；It is described steady
Press current feedback terminal first end respectively with the second resistance (R2), the second end of the 4th electric capacity (C4) and each institute of chip
State the negative pole connection of light emitting diode；Inner linear voltage adjustment output end and the 3rd electric capacity (C3) of the voltage stabilizing chip
First end connection, the 3rd electric capacity (C3) the second end ground connection；The earth terminal ground connection of the voltage stabilizing chip.
3. the light guide plate control circuit of brightness linear according to claim 1 change, it is characterised in that the triode is
NPN type triode.
4. the light guide plate of brightness linear change according to claim 1 controls circuit, it is characterised in that the microprocessor
It is the microprocessor of STM32F series.
5. the light guide plate of brightness linear change according to claim 1 controls circuit, it is characterised in that the voltage stabilizing chip
Model LM3402.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621276259.XU CN206196109U (en) | 2016-11-25 | 2016-11-25 | Light guide plate control circuit of luminance linear change |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621276259.XU CN206196109U (en) | 2016-11-25 | 2016-11-25 | Light guide plate control circuit of luminance linear change |
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| Publication Number | Publication Date |
|---|---|
| CN206196109U true CN206196109U (en) | 2017-05-24 |
Family
ID=58725091
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621276259.XU Active CN206196109U (en) | 2016-11-25 | 2016-11-25 | Light guide plate control circuit of luminance linear change |
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| Country | Link |
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| CN (1) | CN206196109U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108040390A (en) * | 2017-12-05 | 2018-05-15 | 西安科技大学 | LED light light control device without stroboscopic brightness-adjustable is controlled based on PWM |
| TWI672074B (en) * | 2018-06-15 | 2019-09-11 | 緯創資通股份有限公司 | Lighting System, Control Device and Control Method |
| CN110784965A (en) * | 2018-07-30 | 2020-02-11 | 上海雷舞照明技术有限公司 | Driving device and driving chip |
-
2016
- 2016-11-25 CN CN201621276259.XU patent/CN206196109U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108040390A (en) * | 2017-12-05 | 2018-05-15 | 西安科技大学 | LED light light control device without stroboscopic brightness-adjustable is controlled based on PWM |
| TWI672074B (en) * | 2018-06-15 | 2019-09-11 | 緯創資通股份有限公司 | Lighting System, Control Device and Control Method |
| CN110784965A (en) * | 2018-07-30 | 2020-02-11 | 上海雷舞照明技术有限公司 | Driving device and driving chip |
| CN110784965B (en) * | 2018-07-30 | 2023-04-25 | 上海雷舞照明技术有限公司 | Driving device and driving chip |
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