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 PDF

Info

Publication number
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
Authority
CN
China
Prior art keywords
circuit
current
constant
current circuit
led
Prior art date
Application number
CN201310099455.9A
Other languages
Chinese (zh)
Other versions
CN103152895A (en
Inventor
黄家清
Original Assignee
青海聚能达新能源开发有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 青海聚能达新能源开发有限公司 filed Critical 青海聚能达新能源开发有限公司
Priority to CN201310099455.9A priority Critical patent/CN103152895B/en
Publication of CN103152895A publication Critical patent/CN103152895A/en
Application granted granted Critical
Publication of CN103152895B publication Critical patent/CN103152895B/en

Links

Abstract

The invention belongs to technical field of circuit design, particularly the circuit of the direct driving LED of a kind of alternating current.Circuit comprises rectifier bridge, constant-current circuit and LED string, it is characterized in that, input AC electric rectification is all-wave by rectifier bridge, and 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, and 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.Advantage reaches more than 50,000 hours useful life, and far above the LED drive circuit of routine, power factor can reach 0.99, and its volume weight is about 1/10 of same power normal power supplies.

Description

The circuit of the direct driving LED of a kind of alternating current

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.

Claims (2)

1. the circuit by the direct driving LED of alternating current, 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, described 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 keep electric current to be that set point is constant, described biasing circuit comprises a metal-oxide-semiconductor and a biasing resistor, biasing circuit is connected between rectifier bridge output plus terminal and the grid of metal-oxide-semiconductor, metal-oxide-semiconductor drain electrode connects corresponding LED string negative electrode, source electrode connects current sense resistor, described adjustment with circuit be set comprise a triode and a current sense resistor, the collector electrode of triode connects the grid of biasing circuit metal-oxide-semiconductor, grounded emitter, base stage connects the source electrode of current sense resistor and biasing circuit metal-oxide-semiconductor.
2., according to claim 1 circuit by the direct driving LED of alternating current, described constant-current circuit, all current sense resistors are all connected in series.
CN201310099455.9A 2013-03-26 2013-03-26 The circuit of the direct driving LED of a kind of alternating current CN103152895B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201310099455.9A CN103152895B (en) 2013-03-26 2013-03-26 The circuit of the direct driving LED of a kind of alternating current

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201310099455.9A CN103152895B (en) 2013-03-26 2013-03-26 The circuit of the direct driving LED of a kind of alternating current

Publications (2)

Publication Number Publication Date
CN103152895A CN103152895A (en) 2013-06-12
CN103152895B true CN103152895B (en) 2015-07-29

Family

ID=48550688

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201310099455.9A CN103152895B (en) 2013-03-26 2013-03-26 The circuit of the direct driving LED of a kind of alternating current

Country Status (1)

Country Link
CN (1) CN103152895B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105050296A (en) * 2015-09-07 2015-11-11 电子科技大学 LED driving circuit with high power factor characteristic

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN106162990A (en) * 2016-07-05 2016-11-23 浙江中睿低碳科技有限公司 LED light device and method of work thereof

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Also Published As

Publication number Publication date
CN103152895A (en) 2013-06-12

Similar Documents

Publication Publication Date Title
CN201636622U (en) Digital controllable light alternating-current direct drive integrated LED illuminating lamp
CN103139992B (en) With the LED dimming drive system of controllable silicon bypass light adjusting circuit
CN101932175B (en) LED constant current driving circuit capable of dimming automatically
CN202076807U (en) Solar charging circuit
CN102570861B (en) High-power-factor LED (Light Emitting Diode) constant-current driving power supply without electrolytic capacitor
CN101657057B (en) LED power circuit
CN104427688B (en) LED alternating-current drive circuit
CN103269164B (en) The quasi-single-stage high power factor circuit of former limit current constant control and device
CN201813599U (en) LED (Light-Emitting Diode) dimmer power
CN103025018B (en) Light emitting diode (LED) drive circuit controlled by parallel connection high voltage metal oxide semiconductor (MOS) tube
CN102186282A (en) Drive circuit capable of improving power factors of alternating current light emitting diode (AC LED) lamp
US20160037592A1 (en) Driving device for led and the driving method thereof
CN103648202A (en) Active power factor correction control circuit, chip and LED (Light Emitting Diode) drive circuit
CN101534587A (en) Commercial power LED constant current driver
CN201230282Y (en) Auxiliary electric source actuating apparatus for solar photovoltaic combining inverter
CN103152914B (en) Alternating current rectifying circuit and alternating current rectifying method for driving light-emitting diode (LED) module
CN201869403U (en) Illumination LED CC driving circuit with automatic dimming function
CN205491293U (en) Solar energy LED lighting control circuit
CN104333934A (en) LED illumination driving circuit
CN103442504A (en) LED (Light Emitting Diode) constant current driving circuit based on PWM (Pulse-Width Modulation) light-adjusting mode
CN203596948U (en) LED driving circuit with compatible electronic ballast
CN201590932U (en) LED alternating-current direct driving circuit
CN101711066B (en) LED alternating current (AC) directly-powered circuit and power supply method
CN203399353U (en) Novel LED alternating current drive circuit
CN102202441A (en) Constant-current controller topology circuit powered directly by alternating current power supply for LED lighting lamp

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
GR01 Patent grant
C14 Grant of patent or utility model