CN104519645B - A kind of guide-lighting drive circuit based on PWM light modulation - Google Patents
A kind of guide-lighting drive circuit based on PWM light modulation Download PDFInfo
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- CN104519645B CN104519645B CN201410692744.4A CN201410692744A CN104519645B CN 104519645 B CN104519645 B CN 104519645B CN 201410692744 A CN201410692744 A CN 201410692744A CN 104519645 B CN104519645 B CN 104519645B
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- pwm signal
- guide plate
- light guide
- pwm
- resistance
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Abstract
The present invention relates to a kind of guide-lighting drive circuits based on PWM light modulation, are mainly made of a pwm signal input terminal, a pwm signal output end, a light guide plate dimming power source circuit and a Waveform adjusting circuit.Duty ratio of the light guide plate dimming power source circuit to change the input signal received from the pwm signal input terminal, to form the output signal and be sent out to the pwm signal output end.The advantage of the invention is that; a kind of novel light guide plate light modulation driving method is provided; duty ratio by adjusting PWM realizes light modulation purpose, and well solve LED inside light guide plate when closed glimmer the problem of and inductive load and capacitive load protection problem that circuit is had an impact.
Description
Technical field
The present invention relates to the light guide plate in airborne equipment, especially a kind of guide-lighting drive circuit based on PWM light modulation.
Background technique
Light guide plate is a kind of illumination component indispensable in airborne equipment, is mainly used for character illumination and information is shown.
Aviation industry develops to today, proposes that increasingly higher demands, the design of light guide plate driving need to consider the limit to airborne equipment
The redundancy design problem of environment, it has been found that under high temperature environment, rated current when light guide plate works at the standard conditions
It is impossible to meet it to work under high temperature environment, so, when design driven circuit, needs rated current amplifying 3-4 times to set
Meter.However, common small package triode has been unable to meet the design of high current, triode is current drive-type electric elements, MOS
Pipe is voltage driven type electric elements, and input impedance is high, required static drive power very little, and encapsulation is small big by electric current, so
And since there is parasitic capacitances between each pole, during being switched on and off, especially in high frequency applications, driving electricity
Road allows for carrying out quick charge/discharge to its parasitic capacitance.Therefore, driving pulse should have sufficiently small rising and falling edges
Time and delay want small.Sufficiently large instantaneous peak current can be provided when unlatching, so that open time delay is short enough, required
Time in complete charge and discharge to metal-oxide-semiconductor input capacitance Ciss；Low-resistance discharge loop can be provided when shutdown for gate charge, mentioned
High turn-off speed.
Summary of the invention
Present invention aim to address the problems of the prior art, provide a kind of novel light guide plate based on PWM light modulation
Driving circuit.
To achieve the goals above, the technical scheme of the present invention is realized as follows: a kind of light guide plate based on PWM light modulation
Driving circuit, including,
One pwm signal input terminal, to provide an input signal；
One pwm signal output end, to provide an output signal；
One light guide plate dimming power source circuit, is connected between the pwm signal input terminal and the pwm signal output end,
Duty of the light guide plate dimming power source circuit to change the input signal received from the pwm signal input terminal
Than to form the output signal and be sent out to the pwm signal output end；And
One Waveform adjusting circuit is mainly made of one the 5th resistance R5 and a first diode D1, the 5th resistance
The cathode of the first end of R5 and the first diode D1 are all connected to the light guide plate dimming power source circuit and the pwm signal
Between output end, the second end of the 5th resistance R5 and the anode of the first diode D1 are grounded.
As it is a kind of based on PWM light modulation guide-lighting drive circuit preferred embodiment, the light guide plate dimming power source circuit,
Including,
The pwm signal input terminal by a first resistor R1 respectively with the first end of a second resistance R2 and one the 2nd 3
The base stage of pole pipe Q2 connects, and the collector of the second triode Q2 is by one the 4th resistance R4 respectively with a 3rd resistor R3's
The connection of the grid of first end and first metal-oxide-semiconductor of P-channel type, the second end of the 3rd resistor R3 and first metal-oxide-semiconductor
Source electrode is connect with a positive voltage terminal, and the drain electrode of first metal-oxide-semiconductor is connect with the pwm signal output end, and the described 2nd 3
The second end of the emitter of pole pipe Q2 and the second resistance R2 are grounded.
Compared with prior art, advantages of the present invention: the duty ratio by adjusting PWM realizes light modulation purpose, and well
Solve the problems, such as that glimmer and inductive load and capacitive load ask the protection that circuit has an impact to LED when closed inside light guide plate
Topic.
Detailed description of the invention
Fig. 1 is electrical block diagram of the invention.
Specific embodiment
It elaborates with reference to the accompanying drawings and examples to the present invention.
Referring to Figure 1, it is shown in figure be it is a kind of based on PWM light modulation guide-lighting drive circuit mainly by a pwm signal
Input terminal, a pwm signal output end, a light guide plate dimming power source circuit and Waveform adjusting circuit composition.
The pwm signal input terminal is to provide an input signal.The pwm signal output end is to provide output letter
Number.
The light guide plate dimming power source circuit:
The pwm signal input terminal by a first resistor R1 respectively with the first end of a second resistance R2 and one the 2nd 3
The base stage of pole pipe Q2 connects, and the collector of the second triode Q2 is by one the 4th resistance R4 respectively with a 3rd resistor R3's
The connection of the grid of first end and first metal-oxide-semiconductor of P-channel type, the second end of the 3rd resistor R3 and first metal-oxide-semiconductor
Source electrode is connect, the drain electrode of first metal-oxide-semiconductor and the pwm signal output end with a positive voltage terminal (the present embodiment is+15V)
Connection, the emitter of the second triode Q2 and the second end of the second resistance R2 are grounded.
After the input signal is by the first resistor R1 and second resistance R2 partial pressure, high level voltage is clamped
To certain value (the present embodiment 0.7V, the conduction voltage drop of triode), so that the second triode Q2 be made to be in switch state.
After the second triode Q2 conducting, the both ends the 3rd resistor R3 generate pressure drop, so that the first metal-oxide-semiconductor Q1 be made to lead
It is logical, it begins to turn in a flash, the parasitic capacitance Cgd between grid and drain electrode passes through the 4th resistance R4 and the described 2nd 3
Pole pipe Q2 discharges over the ground, and the 3rd resistor R3 both end voltage stops electric discharge after stablizing, and discharge time can be according to parasitic capacitance
The parameter of Cgd and the 4th resistance R4 calculate, and the length of discharge time determines rising time of the output end from 0V to 15V.
When the second triode Q2 is from the moment for being conducting to shutdown, the positive power source terminal is by the 3rd resistor R3 to grid and leakage
The parasitic capacitance Cgd of interpolar charges, and the charging time can calculate according to the parameter of parasitic capacitance Cgd and the 3rd resistor R3
Out, the length in charging time determines failing edge time of the output end from 15V to 0V.If having spy to rising edge and failing edge time
Different requirement can change the parameter of the 3rd resistor R3 and the 4th resistance R4.
Waveform adjusting circuit:
The Waveform adjusting circuit is mainly made of one the 5th resistance R5 and a first diode D1, the 5th resistance R5
First end and the cathode of the first diode D1 be all connected to the light guide plate dimming power source circuit and the pwm signal is defeated
Between outlet, the second end of the 5th resistance R5 and the anode of the first diode D1 are grounded, that is, the 5th resistance R5
With the light guide plate at parallel-connection structure.
In view of the reliability and leakage current of the first metal-oxide-semiconductor Q1, the 5th resistance R5 of a small load is set, is prevented
When only output end is non-loaded, light guide plate glimmer is existing in the case that the first metal-oxide-semiconductor Q1 is damaged and it is turned off when there is load
As.It is also contemplated that the capacitance characteristic and inductance characteristic of load, first diode D1 described in reverse parallel connection one, convenient for capacitive load and
Inductive load energy is released.
Embodiments of the present invention are only expressed above, and the description thereof is more specific and detailed, but can not therefore understand
For the limitation to patent of invention range.It should be pointed out that for those of ordinary skill in the art, not departing from this hair
Under the premise of bright design, various modifications and improvements can be made, and these are all within the scope of protection of the present invention.Therefore, this hair
The scope of protection shall be subject to the appended claims for bright patent.
Claims (1)
1. a kind of guide-lighting drive circuit based on PWM light modulation, which is characterized in that including,
One pwm signal input terminal, to provide an input signal；
One pwm signal output end, to provide an output signal；
One light guide plate dimming power source circuit, is connected between the pwm signal input terminal and the pwm signal output end, described
Duty ratio of the light guide plate dimming power source circuit to change the input signal received from the pwm signal input terminal, with
It forms the output signal and is sent out to the pwm signal output end；And
One Waveform adjusting circuit is mainly made of one the 5th resistance R5 and a first diode D1, the 5th resistance R5's
The cathode of first end and the first diode D1 are all connected to the light guide plate dimming power source circuit and the pwm signal exports
Between end, the second end of the 5th resistance R5 and the anode of the first diode D1 are grounded；
The light guide plate dimming power source circuit, including, the pwm signal input terminal is by a first resistor R1 respectively with one second
The collector of the first end of resistance R2 and the connection of the base stage of one second triode Q2, the second triode Q2 passes through one the 4th electricity
Resistance R4 is connect with the grid of the first end of a 3rd resistor R3 and first metal-oxide-semiconductor of P-channel type respectively, the 3rd resistor R3's
The source electrode of second end and first metal-oxide-semiconductor is connect with a positive voltage terminal, and the drain electrode of first metal-oxide-semiconductor and the PWM believe
The connection of number output end, the emitter of the second triode Q2 and the second end of the second resistance R2 are grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410692744.4A CN104519645B (en) | 2014-11-27 | 2014-11-27 | A kind of guide-lighting drive circuit based on PWM light modulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410692744.4A CN104519645B (en) | 2014-11-27 | 2014-11-27 | A kind of guide-lighting drive circuit based on PWM light modulation |
Publications (2)
| Publication Number | Publication Date |
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| CN104519645A CN104519645A (en) | 2015-04-15 |
| CN104519645B true CN104519645B (en) | 2019-01-08 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108235502A (en) * | 2017-01-19 | 2018-06-29 | 肖志军 | The constant current driving method and circuit of LED light light modulation |
| CN110492559A (en) * | 2019-08-01 | 2019-11-22 | 深圳市无限动力发展有限公司 | Sweeping robot and its sweeping robot cradle |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201062748Y (en) * | 2007-07-25 | 2008-05-21 | 杜振辉 | Stroboscopic/lighting device based on LED |
| CN202172516U (en) * | 2011-08-02 | 2012-03-21 | 北京同步科技有限公司 | Brightness and color temperature adjustable LED lamp |
| US20120176052A1 (en) * | 2011-01-06 | 2012-07-12 | Everlight Electronics Co., Ltd. | Light-Emitting Diode Drive Control Circuit |
| CN103188845A (en) * | 2011-12-31 | 2013-07-03 | 四川新力光源股份有限公司 | Light emitting diode (LED) light-emitting device directly driven by alternating current |
-
2014
- 2014-11-27 CN CN201410692744.4A patent/CN104519645B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201062748Y (en) * | 2007-07-25 | 2008-05-21 | 杜振辉 | Stroboscopic/lighting device based on LED |
| US20120176052A1 (en) * | 2011-01-06 | 2012-07-12 | Everlight Electronics Co., Ltd. | Light-Emitting Diode Drive Control Circuit |
| CN202172516U (en) * | 2011-08-02 | 2012-03-21 | 北京同步科技有限公司 | Brightness and color temperature adjustable LED lamp |
| CN103188845A (en) * | 2011-12-31 | 2013-07-03 | 四川新力光源股份有限公司 | Light emitting diode (LED) light-emitting device directly driven by alternating current |
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