CN103152895B - The circuit of the direct driving LED of a kind of alternating current - Google Patents
The circuit of the direct driving LED of a kind of alternating current Download PDFInfo
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- CN103152895B CN103152895B CN201310099455.9A CN201310099455A CN103152895B CN 103152895 B CN103152895 B CN 103152895B CN 201310099455 A CN201310099455 A CN 201310099455A CN 103152895 B CN103152895 B CN 103152895B
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Abstract
Description
one, technical field:the invention belongs to technical field of circuit design, particularly the circuit of the direct driving LED of a kind of alternating current.
two, background technology:
The advantages such as light-emitting diode (LED) solid light source has that luminous efficiency is high, environmental protection, life-span are long, be described as the 5th generation lighting source.Due to LED has can only forward conduction, therefore existing LED all needs, by supply convertor, alternating current is converted to direct current and powers.Along with the application that LED lamp is increasingly extensive, also make the problem of harmonic pollution cause people and more and more pay close attention to.
Exchange in direct driving LED lamp (AC LED) circuit, alternating voltage is without large bulk capacitance filtering, the two ends of direct loading series LED lamp string, due to the existence of LED conducting valve threshold voltage, the just conducting after input voltage is higher than lamp string threshold voltage of lamp string, power factor only has about 0.65, and harmonic current is excessive, cannot apply on a large scale.
three, summary of the invention:
The object of the invention is for above shortcomings in prior art, and the circuit of the direct driving LED of a kind of alternating current of research and design, the advantage of this circuit is: one. efficiently solve existing AC LED power factor low, can not the present situation applied of specification greatly; Two. provide a kind of long-life, low cost, electric energy good
High Power Factor AC LED drive circuit.
Technical scheme is: the circuit of the direct driving LED of a kind of alternating current of the present invention, it comprises rectifier bridge, constant-current circuit and LED string, it is characterized in that, input AC electric rectification is all-wave by rectifier bridge, rectifier bridge output plus terminal connects the anode of LED string and the offset side of n constant-current circuit of n series connection, and the output negative terminal of rectifier bridge connects n constant-current circuit the earth terminal of middle regulating circuit and the current sense resistor of the n-th constant-current circuit, constant-current circuit in current sense resistor all connect, the quantity of the current sense resistor of i-th actual use of constant-current circuit is n+1-i, wherein i=1,2 ... n, LED string is divided into n section, constant-current circuit input termination i-th section of LED string and the intersection point of the i-th+1 section lamp string.Along with the minimizing of current sense resistor quantity, resistance is successively decreased, and the constant current value of constant-current circuit increases successively.The direct driving LED circuit for lamp of described interchange, it is characterized in that, constant-current circuit comprises a biasing circuit and an adjustment and arranges circuit, biasing circuit provides initial operating voltage for constant-current circuit, constant-current circuit is made to be conducting state, regulate and the resistance that circuit passes through to change current sense resistor is set sets the current value flowing through corresponding lamp string, and keeping electric current to be that set point is constant.Described biasing circuit comprises a metal-oxide-semiconductor and a biasing resistor, and biasing circuit is connected between rectifier bridge output plus terminal and the grid of metal-oxide-semiconductor, and metal-oxide-semiconductor drain electrode connects corresponding LED string negative electrode, and source electrode connects current sense resistor.Regulating circuit and arrange circuit and comprise a triode and a current sense resistor, the collector electrode of triode connects the grid of biasing circuit metal-oxide-semiconductor, grounded emitter, and base stage connects the source electrode of current sense resistor and biasing circuit metal-oxide-semiconductor.Described constant-current circuit, all current sense resistors are all connected in series.
For the series connection of n section LED string, the model of LED of often going here and there is identical, quantity is equal, if the total threshold voltage of LED string is , then i-th section of LED string threshold values is (i=1,2 ... n, n>=2), when voltage is in with between time, i-th constant-current circuit conducting.Because the current sense resistor resistance of i-th constant-current circuit is less than the i-th-1 constant-current circuit, current ratio the i-th-1 constant-current circuit of setting is large, and the i-th-1 constant-current circuit automatic cut-off, achieves the seamless switching of electric current.Along with the rising of voltage, n constant-current circuit progressively ON operation, electric current progressively increases and is ended by constant-current circuit little for setting electric current.When input voltage exceedes total threshold voltage time, n-th constant-current circuit conducting, electric current reaches maximum, when voltage starts to decline, and during lower than conducting valve threshold voltage, then the constant-current circuit ON operation that previous stage electric current is little, the electric current flowing through LED string progressively reduces, make input current in one-period along with the rising of voltage and decline stepped change, thus reach the object improving power utilization efficiency and power factor.And utilizing the method for being connected by constant-current circuit current sense resistor, the constant-current circuit that automatic cut-off electric current is little, enormously simplify circuit design, reduces costs, improve reliability.
The invention has the beneficial effects as follows:
1, because circuit of the present invention is all made up of semiconductor device and resistance, without any the electric capacity of kind, therefore its useful life and LED life-span match, and can reach more than 50,000 hours, far above the LED drive circuit of routine.
2, circuit of the present invention, can according to the LED quantity of input voltage determination cut-in operation, and the operating current of the LED string that automatically switches, circuit is simply effective, and drive conversion efficiency to reach 97%, power factor can reach 0.99.
3, circuit of the present invention does not need with the larger device of transformer, inductance, electrochemical capacitor equal-volume and weight, and therefore volume and weight of the present invention is much smaller than conventional LED drive power, is about 1/10 of same power normal power supplies.
four, accompanying drawing explanation
Fig. 1 is electrical block diagram of the present invention.
Fig. 2 is the circuit theory diagrams of the embodiment of the present invention 1.
Below in conjunction with drawings and Examples, content of the present invention is described in further details, but actual fabrication structure of the present invention is not limited in following embodiment.
five, embodiment:
Embodiment 1: with reference to Fig. 2, the lamp string n section of LED is divided into 3 sections, and the voltage waveform after the 50Hz simple alternating current Electronic Speculum rectifier bridge BD1 of input is 100Hz all-wave; R1, M1, Q1, R4, R5, R6 form constant-current circuit 1; R2, M2, Q2, R5, R6 form constant-current circuit 2; R3, M3, Q3, R6 form constant-current circuit 3.The output plus terminal of rectifier bridge connects the anode of LED string and the offset side of 3 constant-current circuits of 3 series connection, and the output negative terminal of rectifier bridge meets emitter and the 3rd the constant-current circuit detection resistance R6 of regulating circuit Q1, Q2, Q3 in 3 constant-current circuits.Current sense resistor R4, R5, R6 in 3 constant-current circuits all connect use, and LED string is divided into 3 sections, and the negative electrode of the corresponding lamp string of input termination of constant-current circuit, forms complete current control circuit.
The current value that constant-current circuit 1 sets is:
The current value that constant-current circuit 2 sets is:
The current value that constant-current circuit 3 sets is:
If the total threshold voltage of LED is , full-wave rectification maximum voltage is , when input voltage is less than time, constant-current circuit 1 conducting, accesses the 1st section of LED string work; When input voltage rises to with between time, the 2nd constant-current circuit conducting, access the 1st section and the work of the 2nd section of LED string, resistance R4 both end voltage is equal, the 1st constant-current circuit automatic cut-off; When input voltage higher than time, the 3rd constant-current circuit conducting, access whole LED string work, resistance R5 both end voltage is equal, the 2nd constant-current circuit automatic cut-off; When input voltage drops to with between time, constant-current circuit 3 ends, constant-current circuit 2 ON operation, accesses the 1st section and the 2nd section of LED string; When input voltage drop to lower than time, constant-current circuit 1 works, and accesses the 1st section of LED string.
Therefore use the direct driving LED circuit of interchange of the present embodiment, along with rising and the reduction of voltage, LED segmentation is lighted, and according to input voltage switch operating electric current voluntarily, after tested, power factor reaches as high as 0.99.
Embodiment 2: with reference to Fig. 2, LED is divided into 3 sections, the voltage waveform after the 50Hz simple alternating current Electronic Speculum rectifier bridge BD1 of input is 100Hz all-wave; R1, M1, Q1, R4, R5, R6 form constant-current circuit 1; R2, M2, Q2, R5, R6 form constant-current circuit 2; R3, M3, Q3, R6 form constant-current circuit 3.The output plus terminal of rectifier bridge connects the anode of LED string and the offset side of 3 constant-current circuits of 3 series connection, and the output negative terminal of rectifier bridge meets emitter and the 3rd the constant-current circuit detection resistance R6 of regulating circuit Q1, Q2, Q3 in 3 constant-current circuits.Current sense resistor R4, R5, R6 in 3 constant-current circuits all connect use, and LED string is divided into 3 sections, and the negative electrode of the corresponding lamp string of input termination of constant-current circuit, forms complete current control circuit.
The current value that constant-current circuit 1 sets is:
The current value that constant-current circuit 2 sets is:
The current value that constant-current circuit 3 sets is:
If the total threshold voltage of LED is , full-wave rectification maximum voltage is , when input voltage is less than time, constant-current circuit 1 conducting, accesses the 1st section of LED string work; When input voltage rises to with between time, the 2nd constant-current circuit conducting, access the 1st section and the work of the 2nd section of LED string, resistance R4 both end voltage is equal, the 1st constant-current circuit automatic cut-off; When input voltage higher than time, the 3rd constant-current circuit conducting, access whole LED string work, resistance R5 both end voltage is equal, the 2nd constant-current circuit automatic cut-off; When input voltage drops to with between time, constant-current circuit 3 ends, constant-current circuit 2 ON operation, accesses the 1st section and the 2nd section of LED string; When input voltage drop to lower than time, constant-current circuit 1 works, and accesses the 1st section of LED string.
Therefore use the direct driving LED circuit of interchange of the present embodiment, along with rising and the reduction of voltage, LED segmentation is lighted, and according to input voltage switch operating electric current voluntarily, after tested, power factor reaches as high as 0.99.
Embodiment 3: with reference to Fig. 2, LED is divided into 3 sections, the voltage waveform after the 50Hz simple alternating current Electronic Speculum rectifier bridge BD1 of input is 100Hz all-wave; R1, M1, Q1, R4, R5, R6 form constant-current circuit 1; R2, M2, Q2, R5, R6 form constant-current circuit 2; R3, M3, Q3, R6 form constant-current circuit 3.The output plus terminal of rectifier bridge connects the anode of LED string and the offset side of 3 constant-current circuits of 3 series connection, and the output negative terminal of rectifier bridge meets emitter and the 3rd the constant-current circuit detection resistance R6 of regulating circuit Q1, Q2, Q3 in 3 constant-current circuits.Current sense resistor R4, R5, R6 in 3 constant-current circuits all connect use, and LED string is divided into 3 sections, and the negative electrode of the corresponding lamp string of input termination of constant-current circuit, forms complete current control circuit.
The current value that constant-current circuit 1 sets is:
The current value that constant-current circuit 2 sets is:
The current value that constant-current circuit 3 sets is:
If the total threshold voltage of LED is , full-wave rectification maximum voltage is , when input voltage is less than time, constant-current circuit 1 conducting, accesses the 1st section of LED string work; When input voltage rises to with between time, the 2nd constant-current circuit conducting, access the 1st section and the work of the 2nd section of LED string, resistance R4 both end voltage is equal, the 1st constant-current circuit automatic cut-off; When input voltage higher than time, the 3rd constant-current circuit conducting, access whole LED string work, resistance R5 both end voltage is equal, the 2nd constant-current circuit automatic cut-off; When input voltage drops to with between time, constant-current circuit 3 ends, constant-current circuit 2 ON operation, accesses the 1st section and the 2nd section of LED string; When input voltage drop to lower than time, constant-current circuit 1 works, and accesses the 1st section of LED string.
Therefore use the direct driving LED circuit of interchange of the present embodiment, along with rising and the reduction of voltage, LED segmentation is lighted, and according to input voltage switch operating electric current voluntarily, after tested, power factor reaches as high as 0.99.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105050296A (en) * | 2015-09-07 | 2015-11-11 | 电子科技大学 | LED driving circuit with high power factor characteristic |
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| CN104427688B (en) * | 2013-08-23 | 2016-09-28 | 四川新力光源股份有限公司 | LED alternating-current drive circuit |
| CN104661401A (en) * | 2014-12-12 | 2015-05-27 | 青海聚能达新能源开发有限公司 | LED plant growth lamp driving control device |
| CN105813285A (en) * | 2014-12-31 | 2016-07-27 | 四川新力光源股份有限公司 | LED constant current driving device |
| CN104582196A (en) * | 2015-01-27 | 2015-04-29 | 中国科学技术大学先进技术研究院 | Direct-current high-voltage direct-driven LED circuit based on high-power passive harmonic filter |
| CN105188208B (en) * | 2015-09-02 | 2017-07-07 | 合肥云杉光电科技有限公司 | A kind of exchange of power-self-stablizing is straight to drive LED methods and the electronic circuit based on it |
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| CN101668373A (en) * | 2009-09-29 | 2010-03-10 | 李云霄 | LED light source driving circuit supplied by AC power |
| CN101711066B (en) * | 2009-12-23 | 2012-08-01 | 陕西西电科大华成电子股份有限公司 | LED alternating current (AC) directly-powered circuit and power supply method |
| CN201585165U (en) * | 2009-12-23 | 2010-09-15 | 陕西西电科大华成电子股份有限公司 | LED alternating-current direct power supply circuit |
| CN102202440A (en) * | 2010-03-23 | 2011-09-28 | 陕西西电科大华成电子股份有限公司 | Constant current controller which is powered by alternative current used in LED illuminating lamps |
| CN201821552U (en) * | 2010-09-21 | 2011-05-04 | 王汉忠 | LED constant current driving circuit |
| CN102186282B (en) * | 2011-03-21 | 2013-11-27 | 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 |
| CN102403703A (en) * | 2011-11-15 | 2012-04-04 | 中国航天科技集团公司第九研究院第七七一研究所 | Over-current protection circuit of AC (Alternating Current) LED (Light-Emitting diode) lamp |
| CN202374531U (en) * | 2011-12-21 | 2012-08-08 | 韦挽澜 | White light-emitting diode (LED) drive circuit without electrolytic capacitor |
| CN203162873U (en) * | 2013-04-09 | 2013-08-28 | 青海聚能达新能源开发有限公司 | AC (alternating current) direct-drive current correcting circuit of LED lamp |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105050296A (en) * | 2015-09-07 | 2015-11-11 | 电子科技大学 | LED driving circuit with high power factor characteristic |
| CN105050296B (en) * | 2015-09-07 | 2017-06-30 | 电子科技大学 | A kind of LED drive circuit with High Power Factor characteristic |
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