CN103281832A - Electric current soft-starting circuit for driving alternating-current LED - Google Patents

Electric current soft-starting circuit for driving alternating-current LED Download PDF

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Publication number
CN103281832A
CN103281832A CN2013102224731A CN201310222473A CN103281832A CN 103281832 A CN103281832 A CN 103281832A CN 2013102224731 A CN2013102224731 A CN 2013102224731A CN 201310222473 A CN201310222473 A CN 201310222473A CN 103281832 A CN103281832 A CN 103281832A
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China
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led
input
electric current
described
connected
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CN2013102224731A
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Chinese (zh)
Inventor
刘成军
黄杰忠
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东莞博用电子科技有限公司
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Priority to CN2013102224731A priority Critical patent/CN103281832A/en
Publication of CN103281832A publication Critical patent/CN103281832A/en

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Abstract

The invention discloses an electric current soft-starting circuit for driving an alternating-current LED. The electric current soft-starting circuit for driving the alternating-current LED comprises a rectifying circuit, a plurality of LED series connection units, a plurality of starting channels which are matched with the LED series connection units in a one-to-one mode, and a resistor R. When LEDs in an LED lamp are driven, the electric current soft-starting circuit for driving the alternating-current LED can control electric current of the LEDs in the whole LED lamp to slowly increase through the starting channels, the electric current flowing through the LEDs in the LED lamp can not increase instantly, so that safe reliability of the electric current soft-starting circuit for driving the alternating-current LED is improved, and the service life of the LEDs is prolonged.

Description

A kind of electric current soft starting circuit for the AC LED driving

Technical field

The present invention relates to the LED technical field of lamps, relate in particular to a kind of electric current soft starting circuit for the AC LED driving.

Background technology

LED(Light Emitting Diode, light-emitting diode) is to adopt semi-conducting material as the light source of new generation of electrical-optical transfer medium, has characteristics such as energy-saving and environmental protection, the life-span is long, volume is little, will become the main flow illumination substituting electricity-saving lamp soon.Along with global incandescent lamp cut-off taboo pin policy is implemented in regular turn, the LED lighting will be in the face of replacing the opportunity of incandescent lamp, and market scale is up to hundreds billion of.

The start-up circuit that is used for the AC LED driving in the prior art LED light fixture, great majority do not have the soft start scheme, but directly the LED in the LED light fixture is driven, cause flowing through the electric current moment increase of LED, LED(is claimed LED lamp pearl again) itself impact very greatly, cause shorten the useful life of LED easily, even damaging LED, i.e. fail safe is not high.

Summary of the invention

The objective of the invention is to provide at the deficiencies in the prior art the useful life of a kind of LED of prolongation, the electric current soft starting circuit that is used for the AC LED driving of raising circuit safety reliability.

To achieve these goals, the invention provides a kind of electric current soft starting circuit that drives for AC LED, several that it comprises rectification circuit, several LED series units, mate one by one with described several LED series units start passages, resistance R; The input of described rectification circuit is connected with alternating current, and the output of described rectification circuit is connected with the input of first LED series unit, and making rectification circuit is direct current with the AC rectification of input; Described several LED series units are connected in series successively; The reference voltage end input corresponding reference voltage of described startup passage, the output of the LED series unit that the input of described startup passage is corresponding with it connects, the output of described startup passage is connected with an end of described resistance R, the other end ground connection of described resistance R; Described startup passage comprises operational amplifier, metal-oxide-semiconductor, the in-phase input end of operational amplifier is the reference voltage end of described startup passage, the output of operational amplifier is connected with the 1st pin of metal-oxide-semiconductor, the 2nd pin of metal-oxide-semiconductor is the input of described startup passage, the 3rd pin ground connection of metal-oxide-semiconductor, the inverting input of operational amplifier are connected with the 4th pin of metal-oxide-semiconductor and form the output of described startup passage.

Preferably, described rectification circuit is bridge rectifier.

Preferably, described LED series unit is composed in series successively for several LED, and the output of previous LED is connected with the input of a back LED.

Beneficial effect of the present invention is: during LED in the driving LED light fixture, can start the electric current of several LED series units of the corresponding control of passage by several, thereby the electric current of the LED in the control whole LED light fixture slowly increases, the electric current that flows through the LED in the LED light fixture can not increased moment, to improve the circuit safety reliability, prolong the useful life of LED.

Description of drawings

Fig. 1 is circuit theory diagrams of the present invention.

Fig. 2 for the present invention through voltage V1, V2 after the bridge rectifier rectification, the voltage waveform of V3, Vn.

Fig. 3 is that of the present invention several start electric current I 1, the I2 of the inflow input of passage ... the curve synoptic diagram that In changes along with the increase of time t.

Embodiment

The present invention is further illustrated below in conjunction with accompanying drawing.

Please refer to Fig. 1, the present invention is used for the electric current soft starting circuit that AC LED drives, and several that it comprises rectification circuit, several LED series units, mate one by one with several LED series units start passages, resistance R; The input of rectification circuit is connected with alternating current, and the output of rectification circuit is connected with the input of first LED series unit, and making rectification circuit is direct current with the AC rectification of input; Several LED series units are connected in series successively; Start the reference voltage end input corresponding reference voltage of passage, the output of the LED series unit that the input of startup passage is corresponding with it connects, and the output that starts passage is connected the other end ground connection of resistance R with an end of resistance R; Start passage and comprise operational amplifier (U), metal-oxide-semiconductor (Q), the in-phase input end of operational amplifier is for starting the reference voltage end of passage, the output of operational amplifier is connected with the 1st pin of metal-oxide-semiconductor, the 2nd pin of metal-oxide-semiconductor is for starting the input of passage, the 3rd pin ground connection of metal-oxide-semiconductor, the inverting input of operational amplifier are connected with the 4th pin of metal-oxide-semiconductor and form the output that starts passage.

Wherein, rectification circuit is bridge rectifier 1, and specifically, the 1st input (In_1) and the 2nd input (In_2) of bridge rectifier 1 are connected with alternating current, i.e. the 1st input of bridge rectifier 1 and the 2nd input external AC (AC); The input of first LED series unit is connected with the 1st output (Out_1) of bridge rectifier 1, the 2nd output (Out_2) ground connection of bridge rectifier 1.

Wherein, the LED series unit is composed in series successively for several LED, and namely the output of previous LED (negative pole) is connected with the input (positive pole) of a back LED, thereby makes the LED in several LED series units compositions LED light fixture.

Specifically, as shown in Figure 1, several LED series units of present embodiment are that the 1LED series unit (is LED1_1 ... LED1_k), the 2LED series unit (is LED2_1 ... LED2_k), the 3LED series unit (is LED3_1 ... LED3_k) ... the nLED series unit (is LEDn_1 ... LEDn_k), the electric current that several of present embodiment start the inflow input of passage is I1, I2 ... In, the voltage that several of present embodiment start the passage input is VD_1, VD_2 ... VD_n, the reference voltage that several of present embodiment start the reference voltage end input of passage is VREF_1, VREF_2 ... VREF_n, wherein, VREF_1<VREF_2<...<VREF_n.Therefore, its annexation is: the input of 1LED series unit is connected with the 1st output of bridge rectifier 1, the output of 1LED series unit is connected with the input of 2LED series unit, the output of 2LED series unit is connected with the input of 3LED series unit, and the like, until being connected to the nLED series unit; First input that starts passage is connected with the output of 1LED series unit, second input that starts passage is connected with the output of 2LED series unit, the 3rd input that starts passage is connected with the output of 3LED series unit, and the like, n input that starts passage is connected with the output of nLED series unit; The resistance of resistance R is R, and the voltage of an end of described resistance R is Vr.

The concrete operation principle of the present invention is: when starting the LED light fixture, and after the full-wave rectification of bridge rectifier 1 of alternating current process, VD_1, VD_2 ... VD_n obtains the waveform as Fig. 2;

At the voltage uphill process:

1.VD_1 increase gradually, electric current I 1 increased gradually, thereby the electric current that flows through the LED in the LED light fixture is increased gradually, under the clamped effect of VREF_1, make electric current I 1 constant, I1=VREF_1/R is in this process, electric current is not unexpected increase, but slowly changes, and is finally constant;

2. then, voltage continues to increase, VD_2 also increases gradually, and electric current I 2 is also increased gradually, and the electric current of the resistance R of flowing through equals I1+I2, the electric current that flow through the LED in the LED light fixture this moment still maintains I1, when VD_2 was increased to certain value, the operational amplifier of second startup passage began the pressure drop on the resistance R progressively clamped to VREF_2, and electric current I 2 is constant gradually, I2=VREF_2/R, I1 reduces gradually.In this process, the electric current that flows through the LED in the LED light fixture is not unexpected increase, but slowly changes, and is finally constant, Vr=VREF_2>VREF_1 at this moment, I1=0;

3. then, the process of similar front is not unexpected increase up to n electric current I n that starts passage, but slowly changes, and is finally constant, makes In-1=0;

Otherwise, opposite with above-mentioned voltage uphill process (voltage decline process and voltage uphill process be symmetrically distributed), in voltage decline process: n electric current I n that starts passage reduced gradually before this, up to being zero, n-1 electric current I n-1 that starts passage increases gradually, up to constant; Then, n-1 electric current I n-1 that starts passage reduces gradually, and up to being zero, n-2 electric current I n-2 that starts passage increases gradually, up to constant; And the like, up to I2=0, I1 increases gradually, up to constant;

Thereby when drawing the LED of the present invention in the driving LED light fixture, several start electric current I 1, the I2 of the inflow input of passages ... the curve that In changes along with the increase of time t, as shown in Figure 3.Finally make the constant current that the electric current that flows through the LED in the LED light fixture increases to gradually to be needed, reach the purpose of the LED in the soft start LED light fixture.

Therefore, by above-mentioned start-up course as can be seen, several start voltage VD_1, the VD_2 of passage input by control in the present invention ... VD_n, the electric current that flows through several LED series units (being the LED in the LED light fixture) is slowly increased, can not increase moment, thereby improve the circuit safety reliability, prolong the useful life of LED.

Should be noted that at last; above embodiment is only in order to illustrate technical scheme of the present invention; but not limiting the scope of the invention; although with reference to preferred embodiment the present invention has been done to explain; those of ordinary skill in the art is to be understood that; can make amendment or be equal to replacement technical scheme of the present invention, and not break away from essence and the scope of technical solution of the present invention.

Claims (3)

1. one kind is used for the electric current soft starting circuit that AC LED drives, and it is characterized in that: several that comprise rectification circuit, several LED series units, mate with described several LED series units one by one start passages, resistance R; The input of described rectification circuit is connected with alternating current, and the output of described rectification circuit is connected with the input of first LED series unit, and making rectification circuit is direct current with the AC rectification of input; Described several LED series units are connected in series successively; The reference voltage end input corresponding reference voltage of described startup passage, the output of the LED series unit that the input of described startup passage is corresponding with it connects, the output of described startup passage is connected with an end of described resistance R, the other end ground connection of described resistance R; Described startup passage comprises operational amplifier, metal-oxide-semiconductor, the in-phase input end of operational amplifier is the reference voltage end of described startup passage, the output of operational amplifier is connected with the 1st pin of metal-oxide-semiconductor, the 2nd pin of metal-oxide-semiconductor is the input of described startup passage, the 3rd pin ground connection of metal-oxide-semiconductor, the inverting input of operational amplifier are connected with the 4th pin of metal-oxide-semiconductor and form the output of described startup passage.
2. the electric current soft starting circuit that drives for AC LED according to claim 1, it is characterized in that: described rectification circuit is bridge rectifier.
3. the electric current soft starting circuit that drives for AC LED according to claim 1, it is characterized in that: described LED series unit is composed in series successively for several LED, and the output of previous LED is connected with the input of a back LED.
CN2013102224731A 2013-06-06 2013-06-06 Electric current soft-starting circuit for driving alternating-current LED CN103281832A (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103906288A (en) * 2014-03-04 2014-07-02 东莞博用电子科技有限公司 Switching surge resistant circuit applied to LED alternating-current drive chip
CN106170160A (en) * 2015-05-20 2016-11-30 玉晶光电股份有限公司 Fishing lamp system
CN107544603A (en) * 2017-10-09 2018-01-05 东莞市翔实信息科技有限公司 Unmanned electric light driving constant-current circuit, integrated circuit and control system
CN107567152A (en) * 2017-10-19 2018-01-09 东莞市翔实信息科技有限公司 Linear constant current electric light drive circuit, integrated circuit and control system
CN107577268A (en) * 2017-10-09 2018-01-12 东莞市翔实信息科技有限公司 Unmanned photoelectricity soft-sphere model constant-current circuit, integrated circuit and control system
CN107682963A (en) * 2017-10-19 2018-02-09 东莞市翔实信息科技有限公司 Linear constant current electric light drive circuit, integrated circuit and control system
CN107678481A (en) * 2017-10-09 2018-02-09 东莞市翔实信息科技有限公司 Unmanned photoelectricity soft-sphere model constant-current circuit, integrated circuit and control system
CN107708256A (en) * 2017-10-19 2018-02-16 东莞市翔实信息科技有限公司 Linear constant current electric light drive circuit, integrated circuit and control system
CN107708255A (en) * 2017-10-19 2018-02-16 东莞市翔实信息科技有限公司 Linear constant current electric light drive circuit, integrated circuit and control system
CN107708257A (en) * 2017-10-19 2018-02-16 东莞市翔实信息科技有限公司 Linear constant current electric light drive circuit, integrated circuit and control system
CN107770909A (en) * 2017-10-19 2018-03-06 东莞市翔实信息科技有限公司 Linear constant current electric light drive circuit, integrated circuit and control system

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US20030235062A1 (en) * 2002-06-20 2003-12-25 Lajos Burgyan High efficiency led driver
CN102186282A (en) * 2011-03-21 2011-09-14 中国航天科技集团公司第九研究院第七七一研究所 Drive circuit capable of improving power factors of alternating current light emitting diode (AC LED) lamp
CN102858062A (en) * 2012-08-22 2013-01-02 深圳市明微电子股份有限公司 Light emitting diode (LED) control circuit and LED illuminating device
CN102892238A (en) * 2012-10-30 2013-01-23 四川新力光源股份有限公司 Dimming drive circuit of AC (Alternating Current) direct drive LED module

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030235062A1 (en) * 2002-06-20 2003-12-25 Lajos Burgyan High efficiency led driver
CN102186282A (en) * 2011-03-21 2011-09-14 中国航天科技集团公司第九研究院第七七一研究所 Drive circuit capable of improving power factors of alternating current light emitting diode (AC LED) lamp
CN102858062A (en) * 2012-08-22 2013-01-02 深圳市明微电子股份有限公司 Light emitting diode (LED) control circuit and LED illuminating device
CN102892238A (en) * 2012-10-30 2013-01-23 四川新力光源股份有限公司 Dimming drive circuit of AC (Alternating Current) direct drive LED module

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103906288A (en) * 2014-03-04 2014-07-02 东莞博用电子科技有限公司 Switching surge resistant circuit applied to LED alternating-current drive chip
CN106170160A (en) * 2015-05-20 2016-11-30 玉晶光电股份有限公司 Fishing lamp system
CN107678481B (en) * 2017-10-09 2018-11-20 江苏先云信息技术有限公司 Unmanned photoelectricity soft-sphere model constant-current circuit, integrated circuit and control system
CN107544603A (en) * 2017-10-09 2018-01-05 东莞市翔实信息科技有限公司 Unmanned electric light driving constant-current circuit, integrated circuit and control system
WO2019072000A1 (en) * 2017-10-09 2019-04-18 蔡祥云 Unmanned photoelectric soft driving constant-current circuit, integrated circuit and control system
CN107577268A (en) * 2017-10-09 2018-01-12 东莞市翔实信息科技有限公司 Unmanned photoelectricity soft-sphere model constant-current circuit, integrated circuit and control system
WO2019071999A1 (en) * 2017-10-09 2019-04-18 蔡祥云 Unmanned photoelectric soft driving constant-current circuit, integrated circuit and control system
CN107678481A (en) * 2017-10-09 2018-02-09 东莞市翔实信息科技有限公司 Unmanned photoelectricity soft-sphere model constant-current circuit, integrated circuit and control system
WO2019071998A1 (en) * 2017-10-09 2019-04-18 黄俊登 Unmanned electro-optic driving constant-current circuit, integrated circuit and control system
CN107708257A (en) * 2017-10-19 2018-02-16 东莞市翔实信息科技有限公司 Linear constant current electric light drive circuit, integrated circuit and control system
CN107770909A (en) * 2017-10-19 2018-03-06 东莞市翔实信息科技有限公司 Linear constant current electric light drive circuit, integrated circuit and control system
CN107708255A (en) * 2017-10-19 2018-02-16 东莞市翔实信息科技有限公司 Linear constant current electric light drive circuit, integrated circuit and control system
CN107682963A (en) * 2017-10-19 2018-02-09 东莞市翔实信息科技有限公司 Linear constant current electric light drive circuit, integrated circuit and control system
CN107567152A (en) * 2017-10-19 2018-01-09 东莞市翔实信息科技有限公司 Linear constant current electric light drive circuit, integrated circuit and control system
CN107708256A (en) * 2017-10-19 2018-02-16 东莞市翔实信息科技有限公司 Linear constant current electric light drive circuit, integrated circuit and control system

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