CN102625538B - Constant current LED (light-emitting diode) signal conditioning circuit - Google Patents
Constant current LED (light-emitting diode) signal conditioning circuit Download PDFInfo
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- CN102625538B CN102625538B CN201210084600.1A CN201210084600A CN102625538B CN 102625538 B CN102625538 B CN 102625538B CN 201210084600 A CN201210084600 A CN 201210084600A CN 102625538 B CN102625538 B CN 102625538B
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Abstract
A constant current LED (light-emitting diode) signal conditioning circuit comprises a signal input module, a linearization conversion module, a current detecting module, a voltage limiting module and an electronic switch module. The constant current LED signal conditioning circuit has a constant current driving function capable of directly driving an LED lamp when the signal input module does not receive dimming voltage from a user, and the signal input module can disconnect the connection with an inner current detecting reference when a dimming signal is received, the dimming signal voltage of 1-10v can be converted into the dimming voltage with good linearity to control the light output of the LED lamp, and accordingly more comfortable and satisfying lighting environment can be provided for the user.
Description
Technical field
The present invention relates to LED driving power field, especially a kind of modulate circuit that there is inner constant current control and can receive again external dimmer signal.
Background technology
Up to now, LED dimming power source, can be divided into simulation light modulation and digital dimming, and controllable silicon light modulation changes its angle of flow, pollutes electrical network.PWM light modulating frequency processing bad, easily produces noise.One has the power supply that receives only external dimmer signal, and in the time there is no dim signal voltage, power supply is difficult to stable.When not thering is the LED power supply of dimming function, receive its external dimmer signal, the linearity is very poor, scheme relative complex.
The patent of invention that application number is CN200910039996.6 provides a kind of Dimmable LED constant-current drive circuit, but this circuit is comparatively complicated, and the cost of manufacture of circuit board is high.
Summary of the invention
The present invention proposes a kind of dim signal, inner signal conditioning circuit also with constant current control of while of receiving, and described circuit comprises
Signal input module, for receiving LED power control signal;
Linearisation modular converter, is connected with described signal input module, carries out linearizing processing for the voltage that described signal input module is received, and converts the dim signal voltage matching with LED power supply to;
Current detection module, is connected with described linearisation modular converter, for detection of the dim signal input current of described LED power supply;
Pressure limiting module, is connected with described signal input module, for voltage control that described signal input module is transmitted in certain limit;
Electronic switch module, be connected with described pressure limiting module and current detection module, its inside is provided with electronic switch, described electronic switch comprises positive-negative-positive triode Q1, NPN type triode Q2 and control chip, in the time that described signal input module receives the dim signal within the scope of certain voltage, the first conducting of described NPN type triode Q2, positive-negative-positive triode Q1 conducting afterwards, make described control chip conducting, by current sample benchmark clamper to zero, thereby disconnect and being connected of current detecting reference voltage in LED power supply.
Preferably, the voltage control that described pressure limiting module is transmitted described signal input module is in 10V; Simultaneously, the voltage transitions that described linearisation modular converter receives described signal (1-10V) input module becomes the dim signal voltage matching with power supply, when described electronic switch module receives the dim signal of 1-10V, start described electronic switch and disconnect and being connected of current detecting reference voltage in described LED power supply.
Circuit structure of the present invention is succinct, and in the time not receiving user dimmer voltage is provided, it has constant current and drives, directly driving LED lamp; In the time receiving user's dim signal, disconnection is connected with internal current detection reference, and by linear the dim signal voltage transitions of 1-10V good dimmer voltage, for controlling the light output of LED lamp, for user provides more comfortable, satisfied lighting environment.
Brief description of the drawings
The module connection diagram that accompanying drawing 1 is the preferred embodiment of the present invention;
The circuit connection diagram that accompanying drawing 2 is the preferred embodiment of the present invention.
Embodiment
Shown in Fig. 1, constant-current LED signal conditioning circuit of the present invention comprises signal input module, linearisation modular converter, current detection module, pressure limiting module and electronic switch module, and wherein signal input module is used for receiving LED power control signal; Linearisation modular converter is connected with described signal input module, carries out linearizing processing for the voltage that described signal input module is received, and converts the dim signal voltage matching with LED power supply to; Current detection module is connected with described linearisation modular converter, for detection of the dim signal input current of described LED power supply; Pressure limiting module is connected with described signal input module, for voltage control that described signal input module is transmitted in certain limit; Electronic switch module is connected with described pressure limiting module and current detection module, its inside is provided with electronic switch, in the time that described signal input module receives the dim signal within the scope of certain voltage, described electronic switch disconnects and being connected of current detecting reference voltage in LED power supply.
Preferred embodiment as shown in Figure 2, the signal input module of this circuit is in the time receiving the dim signal of 1-10V, and pressure limiting circuit is limited in 10V; In the time that described electronic switch module receives the dim signal of 1-10V, start immediately electronic switch and disconnect and being connected of the current detecting reference voltage of LED power supply inside, the complete size of current by dim signal control LED power supply, to reach the object of light modulation.
In Fig. 2, pressure limiting module is mainly made up of resistance R 25 and voltage stabilizing didoe ZD1, and described electronic switch comprises that control chip U5 is TL431, triode Q1, triode Q2, and some resistance; Described linearisation modular converter comprises high precision operating amplifier OP07 and some resistance composition.When interface J1 is once the dim signal that receives 1-10V, the first conducting of triode Q2, triode Q1 conducting afterwards, make the voltage of control end (G) of control chip U5 higher than 2.5V, control chip U5 conducting immediately, by current sample benchmark clamper to zero, thereby close power supply internal current detection ring.After triode Q1 conducting, power supply (VCC) is offered to chip U6 after by voltage stabilizing didoe ZD2 voltage stabilizing.The linearisation modular converter being made up of U6 and related device thereof, converts input signal to the signal voltage matching with LED power supply, and it can the linear size that changes LED source current, reaches the object of the light output of having controlled LED lamp.
Constant-current LED signal conditioning circuit of the present invention coordinates power supply to use, and can provide a kind of and has not only had constant current control, but also can receive the LED power supply of the signal of light modulation.When signal conditioning circuit of the present invention receives dimmer voltage signal, carry out pressure limiting control, close the constant current control signal of this power supply simultaneously, through linearisation change-over circuit, improved the linearity of dimmer voltage, there is better dimming effect.The present invention also adopts a diode that the constant current detection of power supply inside and external dimmer signal are isolated, and makes external dimmer signal voltage interference-free.
Last institute should be noted that; above embodiment is only in order to illustrate technical scheme of the present invention but not limiting the scope of the invention; although the present invention is explained in detail with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify or be equal to replacement technical scheme of the present invention, and not depart from essence and the scope of technical solution of the present invention.
Claims (6)
1. a constant-current LED signal conditioning circuit, is characterized in that: described circuit comprises
Signal input module, for receiving LED power control signal;
Linearisation modular converter, is connected with described signal input module, carries out linearizing processing for the voltage that described signal input module is received, and converts the dim signal voltage matching with LED power supply to;
Current detection module, is connected with described linearisation modular converter, for detection of the dim signal input current of described LED power supply;
Pressure limiting module, is connected with described signal input module, for voltage control that described signal input module is transmitted in certain limit;
Electronic switch module, be connected with described pressure limiting module and current detection module, its inside is provided with electronic switch, described electronic switch comprises positive-negative-positive triode Q1, NPN type triode Q2 and control chip, in the time that described signal input module receives the dim signal within the scope of certain voltage, the first conducting of described NPN type triode Q2, positive-negative-positive triode Q1 conducting afterwards, make described control chip conducting, by current sample benchmark clamper to zero, thereby disconnect and being connected of current detecting reference voltage in LED power supply.
2. constant-current LED signal conditioning circuit as claimed in claim 1, is characterized in that: the voltage control that described pressure limiting module is transmitted described signal input module is in 10V.
3. constant-current LED signal conditioning circuit as claimed in claim 1, is characterized in that: the voltage transitions that described linearisation modular converter receives described signal input module becomes the dim signal voltage of 1-10V.
4. constant-current LED signal conditioning circuit as claimed in claim 1, is characterized in that: when described electronic switch module receives the dim signal of 1-10V, start described electronic switch and disconnect and being connected of current detecting reference voltage in described LED power supply.
5. constant-current LED signal conditioning circuit as claimed in claim 1, is characterized in that: described control chip is TL431.
6. constant-current LED signal conditioning circuit as claimed in claim 1, is characterized in that: described linearisation modular converter comprises high precision operating amplifier OP07.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210084600.1A CN102625538B (en) | 2012-03-27 | 2012-03-27 | Constant current LED (light-emitting diode) signal conditioning circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210084600.1A CN102625538B (en) | 2012-03-27 | 2012-03-27 | Constant current LED (light-emitting diode) signal conditioning circuit |
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| CN102625538A CN102625538A (en) | 2012-08-01 |
| CN102625538B true CN102625538B (en) | 2014-09-03 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103108462A (en) * | 2013-01-25 | 2013-05-15 | 深圳麦格米特电气股份有限公司 | Dimming method of light emitting diode (LED) street lamp |
| CN103209531B (en) * | 2013-04-28 | 2014-11-26 | 宁波赛耐比光电有限公司 | LED (Light Emitting Diode) dimming control circuit |
| CN104470149B (en) * | 2014-12-25 | 2017-04-12 | 东莞卫光电子科技有限公司 | Dimming circuit suitable for multiple dimming modes |
| CN108366465A (en) * | 2018-04-24 | 2018-08-03 | 华域视觉科技(上海)有限公司 | A kind of control circuit for light source and lighting device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201601863U (en) * | 2009-11-13 | 2010-10-06 | 冯俊 | LED lamp with dimming detection circuit |
| CN101932175A (en) * | 2010-08-31 | 2010-12-29 | 电子科技大学 | LED constant current driving circuit capable of dimming automatically |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8492988B2 (en) * | 2009-10-07 | 2013-07-23 | Lutron Electronics Co., Inc. | Configurable load control device for light-emitting diode light sources |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201601863U (en) * | 2009-11-13 | 2010-10-06 | 冯俊 | LED lamp with dimming detection circuit |
| CN101932175A (en) * | 2010-08-31 | 2010-12-29 | 电子科技大学 | LED constant current driving circuit capable of dimming automatically |
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Address after: 528000, Guangdong City, Foshan Province Nanhai District lion town Shishan science and Technology Industrial Park A District Science and technology Avenue East 39 (workshop A) on the third floor Applicant after: Guangdong Kegu Power Co., Ltd. Address before: 4, building 39, block F, No. 528000 east science Road, Shishan science and Technology Industrial Zone, Nanhai District, Foshan, Guangdong, Applicant before: Foshan Kegu Power Electronics Co., Ltd. |
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Address after: 528000, Guangdong City, Foshan Province Nanhai District lion town Shishan science and Technology Industrial Park A District Science and technology Avenue East 39 (workshop A) on the third floor Patentee after: GUANGDONG KEGU POWER ELECTRONICS CO., LTD. Address before: 528000, Guangdong City, Foshan Province Nanhai District lion town Shishan science and Technology Industrial Park A District Science and technology Avenue East 39 (workshop A) on the third floor Patentee before: Guangdong Kegu Power Co., Ltd. |