CN202210894U - Dimming driving circuit - Google Patents
Dimming driving circuit Download PDFInfo
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- CN202210894U CN202210894U CN 201120365422 CN201120365422U CN202210894U CN 202210894 U CN202210894 U CN 202210894U CN 201120365422 CN201120365422 CN 201120365422 CN 201120365422 U CN201120365422 U CN 201120365422U CN 202210894 U CN202210894 U CN 202210894U
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- triode
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Abstract
The utility model discloses a diming driving circuit which comprises a dimming control main circuit and an LED (light-emitting diode) circuit, wherein the dimming control main circuit comprises a first triode and a second triode which are controlled by a PWM (pulse width modulation) control signal and an ON/OFF control signal, as well as an MOS (metal-oxide semiconductor) tube; conduction and closing of the first triode and the second triode are respectively controlled through the PWM control signal and the ON/OFF control signal, and the MOS tube is further controlled to open and close; and the LED circuit comprises multiple paths connected in parallel, and each path comprises a third triode and a fourth triode for constant current drive of an LED light source. The dimming driving circuit disclosed by the utility model has the advantages of simultaneously adjusting the multiple paths of LED light sources and having a simple structure.
Description
Technical field
The utility model relates to a kind of light modulation drive circuit, relates in particular to a kind of constant-current drive circuit of the PWM of employing brightness adjustment control.
Background technology
Existing known, LED has waited until widely in technical fields such as illuminations as light source and has used that LED is applied in as backlight and also becomes market trend in the LCD TV.Right because LED self needs constant-current drive circuit, with the driving LED light source works in constant current state.Light and shade for the reply liquid crystal display picture changes simultaneously, also needs light adjusting circuit to carry out brightness regulation.
Number of patent application is to have disclosed a kind of tunable optical 3 road great power LED constant-current driven modules in 200820157338.8 the Chinese patent; As shown in Figure 1, it adopts the light-coupled isolation mode to carry out PWM (Pulse Width Modulation, pulse-width modulation) light modulation; Utilize chip; Form the buck circuit and carry out constant-current driving, so this constant-current driving scenario-frame is complicated, and cost is higher.
The utility model content
The purpose of the utility model is to overcome the defective of prior art; A kind of light modulation drive circuit is provided; Its light modulation of adopting switch of PWM dim signal control metal-oxide-semiconductor to reach entire circuit drives, carrying out the constant-current driving of LED multi-path circuit simultaneously, and simple in structure.
For realizing above-mentioned purpose; The utility model proposes following technical scheme: a kind of light modulation drive circuit; Comprise brightness adjustment control main circuit and led circuit, wherein said brightness adjustment control main circuit comprises first triode by pwm control signal and the control of ON/OFF (ON/OFF) control signal, second triode and metal-oxide-semiconductor; The conducting of controlling said first triode and second triode respectively through said pwm control signal and ON/OFF control signal with close, and then control the switch of said metal-oxide-semiconductor; Said led circuit comprises the plural road that is connected in parallel, and each road comprises the 3rd triode and the 4th triode of constant-current driving LED light source.
Preferably, said metal-oxide-semiconductor is connected between said first triode and said led circuit, and said metal-oxide-semiconductor is the PMOS pipe.
The drain electrode of said metal-oxide-semiconductor connects the power supply positive voltage terminal, and the grid of metal-oxide-semiconductor and said led circuit join.
Said pwm control signal joins through the base stage of first resistance and first triode, and said ON/OFF control signal is joined through the base stage of second resistance and said second triode.
The collector electrode of the emitter of said first triode and second triode joins, and the collector electrode of first triode joins through the source electrode of the 3rd resistance and said PMOS pipe.
Said plural led circuit is connected in parallel between the emitter of PMOS pipe and second triode that said light modulation drives main circuit.
Compared with prior art, the light modulation drive circuit that the utility model disclosed can be adjusted the LED multi-path light source simultaneously, and owing to increased the ON/OFF control signal, dimming control function is able to strengthen, and simple in structure.
Description of drawings
Fig. 1 is the circuit diagram of existing light modulation drive circuit;
Fig. 2 is the circuit diagram of the utility model light modulation drive circuit.
Embodiment
To combine the accompanying drawing of the utility model below, the technical scheme in the utility model preferred embodiment will be carried out clear, complete description.
Light modulation drive circuit as shown in Figure 2, that the utility model preferred embodiment is disclosed, it comprises the brightness adjustment control main circuit and is connected in parallel in the plural paths of LEDs circuit on the brightness adjustment control main circuit; Wherein the brightness adjustment control main circuit comprises the PWM dimming control signal, ON/OFF (ON/OFF) control signal, the first triode V14; The second triode V24; PMOS manages V1, plural resistance, supply voltage 24V+, 24V-; Wherein the PWM dimming control signal joins through the base stage of first resistance R 3 and the first triode V14, and the ON/OFF control signal is joined through second resistance R 8 and the base stage of the NPN second triode V24.
Wherein, The first triode V14 and the second triode V24 are all the NPN pipe; And the collector electrode of the emitter of the first triode V14 and the second triode V24 joins, and the collector electrode of the first triode V14 joins through the source electrode of the 3rd resistance R 2 and PMOS pipe V1 again, and drain electrode and the power supply positive voltage 24V+ of PMOS pipe V1 join; Grid and the led circuit of PMOS pipe V1 join, and the emitter of the second triode V24 and power-voltage 24V-join.
Plural number paths of LEDs circuit is connected in parallel in gate terminal and the emitter terminal of the second triode V24 of the PMOS pipe V1 of brightness adjustment control main road, and in conjunction with shown in Figure 2, the led circuit in the present embodiment can be one the tunnel or multichannel; Each paths of LEDs circuit structure and component parameters are identical; With the first via is the example explanation, comprises the 3rd triode V25, the 4th triode V28; Resistance R 4, R10 and led light source V2, V5, V8, V11, V15, V18, V21.
During work, the PWM dimming control signal after the R7 dividing potential drop, drives the first triode V14 through the first, the 4th resistance R 3, and this moment, the first triode V14 can be in open/close state.Simultaneously, the ON/OFF control signal after the R9 dividing potential drop, drives the second triode V24 through the second, the 5th resistance R 8, makes the second triode V24 also can be in open/close state.Join through the emitter of the first triode V14 and the collector electrode of the second triode V24; The logic function of " with door " with two triode simple realization; Promptly have only when PWM dimming control signal and ON/OFF control signal exist for high potential simultaneously; The first triode V14 and second all conductings of triode V24 make and the source electrode of the PMOS pipe V1 that the 3rd resistance R 2 is joined is that electronegative potential is opened, and led circuit work is just effective; When having one not exist in PWM dimming control signal and the ON/OFF control signal for electronegative potential; Then one of them not conducting among the first triode V14 and the second triode V24; The source terminal that the feasible PMOS that joins with the 3rd resistance R 2 manages V1 is that high potential cuts out, and led circuit is not worked in this case.
Through the opening and turn-off and control PMOS pipe V1 and be in and open and off state of this first triode V14 and the second triode V24, reached the effect of the LED multi-path circuit being carried out integrally adjusting light like this.Select the VDS=-30V of PMOS (AOS3401) pipe in the present embodiment for use, ID=-4.0A, VGS=+/-12V.Can control the driving of the LED of 80 road 20mA simultaneously.And under the condition of 24V power and P-MOSFET permission, can farthest increase the light modulation way, changed traditional single LED light-modulating mode.
Simultaneously, use the adjusting of two triodes and two resistance in each paths of LEDs circuit of the utility model, realized the function of constant current; In present embodiment first via led circuit, through the 3rd triode V25 and the 4th triode V28, resistance R 4; R10; The collector junction voltage clamp of using the 4th triode V28 is at 0.6V, and R10 selects 27 Ω for use, can be with the circuit constant current at 20mA.Other paths of LEDs circuit are identical with this principle.Simple in structure, convenient and practical, can realize the constant current of LED single channel, not influenced by other roads.
Technology contents of the utility model and technical characterictic have disclosed as above; Yet those of ordinary skill in the art still maybe be based on the teaching of the utility model and announcements and are done all replacement and modifications that does not deviate from the utility model spirit; Therefore; The utility model protection range should be not limited to the content that embodiment discloses, and should comprise various replacement and the modifications that do not deviate from the utility model, and is contained by the present patent application claim.
Claims (6)
1. light modulation drive circuit; It is characterized in that: comprise brightness adjustment control main circuit and led circuit; Wherein said brightness adjustment control main circuit comprises first triode by pwm control signal and the control of ON/OFF control signal; Second triode and metal-oxide-semiconductor, the conducting of controlling said first triode and second triode respectively through said pwm control signal and ON/OFF control signal with close, and then control the switch of said metal-oxide-semiconductor; Said led circuit comprises the plural road that is connected in parallel, and each road comprises the 3rd triode and the 4th triode of constant-current driving LED light source.
2. light modulation drive circuit according to claim 1 is characterized in that: said metal-oxide-semiconductor is connected between said first triode and said led circuit.
3. light modulation drive circuit according to claim 2 is characterized in that: the drain electrode of said metal-oxide-semiconductor connects the power supply positive voltage terminal, and the grid of metal-oxide-semiconductor and said led circuit join.
4. light modulation drive circuit according to claim 1 is characterized in that: said pwm control signal joins through the base stage of first resistance and first triode, and said ON/OFF control signal is joined through the base stage of second resistance and said second triode.
5. according to any described light modulation drive circuit of claim 1 to 4, it is characterized in that: the collector electrode of the emitter of said first triode and second triode joins, and the collector electrode of first triode joins through the source electrode of the 3rd resistance and said PMOS pipe.
6. according to any described light modulation drive circuit of claim 1 to 4, it is characterized in that: said plural led circuit is connected in parallel between the emitter of PMOS pipe and second triode that said light modulation drives main circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120365422 CN202210894U (en) | 2011-09-28 | 2011-09-28 | Dimming driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120365422 CN202210894U (en) | 2011-09-28 | 2011-09-28 | Dimming driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202210894U true CN202210894U (en) | 2012-05-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120365422 Expired - Fee Related CN202210894U (en) | 2011-09-28 | 2011-09-28 | Dimming driving circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN202210894U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102629451A (en) * | 2012-05-09 | 2012-08-08 | 深圳市华星光电技术有限公司 | LED (Light Emitting Diode) backlight driving circuit, liquid crystal display device and driving method |
| CN103680414A (en) * | 2012-09-13 | 2014-03-26 | 上海江森自控汽车电子有限公司 | LCD backlight constant current drive circuit |
| CN103985359A (en) * | 2014-04-16 | 2014-08-13 | 京东方科技集团股份有限公司 | Backlight source drive circuit and display device |
| CN105162328A (en) * | 2015-08-27 | 2015-12-16 | 苏州华兴源创电子科技有限公司 | Metal oxide semiconductor (MOS) tube power switch circuit free of dead-time voltage |
| CN106991960A (en) * | 2017-05-05 | 2017-07-28 | 浙江大华技术股份有限公司 | A kind of drive circuit, display device and electronic equipment |
-
2011
- 2011-09-28 CN CN 201120365422 patent/CN202210894U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102629451A (en) * | 2012-05-09 | 2012-08-08 | 深圳市华星光电技术有限公司 | LED (Light Emitting Diode) backlight driving circuit, liquid crystal display device and driving method |
| CN103680414A (en) * | 2012-09-13 | 2014-03-26 | 上海江森自控汽车电子有限公司 | LCD backlight constant current drive circuit |
| CN103680414B (en) * | 2012-09-13 | 2016-01-06 | 上海伟世通汽车电子系统有限公司 | A kind of LCD backlight constant current drive circuit |
| CN103985359A (en) * | 2014-04-16 | 2014-08-13 | 京东方科技集团股份有限公司 | Backlight source drive circuit and display device |
| CN105162328A (en) * | 2015-08-27 | 2015-12-16 | 苏州华兴源创电子科技有限公司 | Metal oxide semiconductor (MOS) tube power switch circuit free of dead-time voltage |
| CN106991960A (en) * | 2017-05-05 | 2017-07-28 | 浙江大华技术股份有限公司 | A kind of drive circuit, display device and electronic equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20171102 Address after: 215100 3 Building 8, Stone Hill Road, Dongshan Town, Dongshan Town, Suzhou, Wuzhong District, Jiangsu Patentee after: Suzhou East Photoelectric Technology Co., Ltd. Address before: 215000 Dongshan village, Dongshan, Suzhou, Jiangsu, Wuzhong District Patentee before: Suzhou Dongshan Precision Manufacturing Co., Ltd. |
|
| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120502 Termination date: 20200928 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |