CN105517269A - LED light source using current-constant driving controller - Google Patents
LED light source using current-constant driving controller Download PDFInfo
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- CN105517269A CN105517269A CN201410497159.9A CN201410497159A CN105517269A CN 105517269 A CN105517269 A CN 105517269A CN 201410497159 A CN201410497159 A CN 201410497159A CN 105517269 A CN105517269 A CN 105517269A
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Abstract
The invention relates to an LED light source using a current-constant driving controller. The current-constant driving controller comprises a bus current control circuit, the bus current control circuit comprises a branch resistor, a branch capacitor and a branch current source, the branch resistor and the branch capacitor are connected in parallel to form a branch, one end of the branch is connected between a bus resistor and a load, the other end of the branch is connected of the bus current source, the branch current source outputs adjustable current to the branch, and the sum of the voltage of the bus resistor and the voltage of the branch resistor is kept unchanged. The branch resistor occupies part of the voltage of the bus resistor, so that the current output by the bus changes continuously, namely, when current flowing into the branch is increased, the voltage occupied by the branch resistor is increased, the voltage of the bus resistor is reduced, and bus current is reduced. The branch current is adjusted smoothly by the branch current source, so that output current of the bus is adjusted smoothly. Thus, the stroboscopic phenomenon generated due to discontinuous driving current when SPWM waves or a light modulation switch circuit are/is used in the prior art can be avoided.
Description
Technical field
The present invention relates to a kind of LED Driving technique, particularly relate to a kind of LED light source of constant current driving governor.
Background technology
Luminous efficiency and the luminous intensity of the invention of semiconductor device and application LED (Light-Emitting Diode) strengthen day by day, become light source of new generation gradually.The driving mainly constant current driving of current LED, constant-current drive circuit is all realized by special LED drive chip, when carrying out brightness regulation to LED, in LED constant current driving chip, add serial digital signal and PWM (pulse width modulation) signal.This dimming controlling method is the pulse duty factor utilizing PWM ripple to regulate power switch pipe in high-frequency inverter, realizes the adjustment of LED power output.
Its principle is: make to be operated in ZVS (zero voltage switch) state during power switch pipe conducting, shutdown moment need adopt Absorption Capacitance to reach ZCS (Zero Current Switch) operating state, so both can enter ZVS working method, the electric stress of EMI (electromagnetic interference) and power switch pipe can obviously reduce simultaneously.If but the pulse duty factor of PWM ripple is too little, so that drive current is discontinuous, the condition of work of ZVS will be lost, LED is caused to occur stroboscopic situation.In addition, generation PWM ripple needs an external waveshape generating device, increases complexity and the cost of circuit.
Summary of the invention
The present invention is directed to the defect that constant current driver circuit for LED in prior art exists stroboscopic situation, there is provided a kind of by connecting active leg on bus, take the pressure drop on bus bar resistance, thus realize carrying out continuously adjustable bus current control circuit to the bus current size of input load, use the constant current driving governor of this circuit, and use the LED light source of this constant current driving governor.
Technical scheme of the present invention is as follows:
1, a kind of LED light source using constant current driving governor, it is characterized in that: the load be connected with described constant current driving governor is LED load, described constant current driving governor comprises bus current control circuit, described bus current control circuit comprises branch resistance, branch road electric capacity and branch current source, and wherein said branch resistance and branch road Capacitance parallel connection form branch road; One end of described branch road is connected between bus bar resistance and load, and the other end connects described branch current source; Described branch current source exports the adjustable electric current of size to described branch road; Described constant current driving governor also comprises current constant control chip, bus bar resistance, the second diode and accumulation of energy inductance, and described current constant control chip comprises the first pressure measurement pin, the second pressure measurement pin and switch pin; The two ends of described bus bar resistance connect the positive pole of power supply and load respectively, the negative pole of load connects one end of described accumulation of energy inductance, the other end of described accumulation of energy inductance connects the positive pole of described second diode and described switch pin, and described first pressure measurement pin is connected between described bus bar resistance and described power supply; The one end of the branch road be made up of branch resistance and branch road Capacitance parallel connection in described bus current control circuit is connected between bus bar resistance and load, and the branch road other end connects described second pressure measurement pin; Voltage sum on voltage on described bus bar resistance and described branch resistance remains unchanged.
2, LED light source as claimed in claim 1, is characterized in that: described branch road electric capacity is 0.01 ~ 0.22 μ F, and described branch resistance is 0.5 ~ 2K Ω; Described branch current source is a constant-current source.
3, LED light source as claimed in claim 1 or 2, is characterized in that: described constant-current source comprises the first triode, the second triode, equivalent voltage input source, branch road power supply; Wherein variable-resistance certain pin connects described branch road power supply, and another determines the base stage that pin connects described first triode, and dynamic pin connects the base stage of described second triode; The base stage of described first triode is also connected between the base stage of described second triode and described dynamic pin, the collector electrode of described first triode in the base stage of oneself, grounded emitter; The collector electrode of described second triode as the output of described constant-current source, grounded emitter.
4, LED light source as claimed in claim 3, it is characterized in that: described first triode can be replaced the first diode, the positive pole of wherein said first diode is determined to be connected between the base stage of pin and described second triode and described dynamic pin with described another simultaneously, the minus earth of described first diode, described equivalent voltage input source is variable resistor or other variable voltage input circuits.
5, LED light source as claimed in claim 4, it is characterized in that: it also comprises the first resistance and the second resistance, described first resistance is connected between the base stage of described second triode and described dynamic pin; One end of described second resistance is connected between the base stage of described first resistance and described second triode, and the other end is connected on another dynamic pin described.
6, LED light source as claimed in claim 4, is characterized in that: the emitter of described second triode is by a grounding through resistance.
7, LED light source as claimed in claim 1, is characterized in that: described first pressure measurement pin, the second pressure measurement pin are for measuring the voltage between described bus bar resistance and described branch resistance.
8, the LED light source as described in claim 1 or 7, is characterized in that: described current constant control chip is switch mode constant current driving chip.
9, LED light source as claimed in claim 8, is characterized in that: described first pressure measurement pin is the power input of described switch mode constant current driving chip.
10, LED light source as claimed in claim 9, is characterized in that: described current constant control chip, bus bar resistance, the second diode and accumulation of energy inductance carry out hybrid package.
Technique effect of the present invention is as follows:
A kind of bus current control circuit of the present invention comprises branch resistance, branch road electric capacity and branch current source, and wherein branch resistance and branch road Capacitance parallel connection form branch road, and branch road one end is connected between bus bar resistance and load, and the other end connects branch current source; Branch current source exports the adjustable electric current of size to branch road, and the voltage on bus bar resistance and the voltage sum on branch resistance remain unchanged.Wherein branch resistance occupies the portion voltage of bus bar resistance, make the size of current generation consecutive variations that bus exports, namely when the electric current flowing into branch road strengthens, the voltage that branch resistance takies strengthens, voltage on bus bar resistance reduces, thus bus current is reduced.Due to branch current be by branch current source smoothing regulate, be also therefore level and smooth to the adjustment of output current on bus.Avoiding problems in prior art and use in SPWM ripple or dimmer switch circuit, the stroboscopic phenomenon produced because drive current is discontinuous.
Due to branch resistance and a larger branch road Capacitance parallel connection, how the voltage no matter on bus bar resistance changes, and the voltage on branch resistance all tends towards stability, and can not impact the characteristic of bus circuit itself.
As long as bus current control circuit of the present invention accesses in bus in use, without the need to external circuits and the wave generator circuit of complexity, simplify circuit design, reduce use cost, and convenient and reliable.The present invention not only can be applicable to the intensification modulation of LED light source, and other need to carry out the field of constant current driving also to can be applicable to motor etc.
Branch current source of the present invention is constant-current source, and its constant-current source comprises the first triode, the second triode, variable resistor, branch road power supply; Wherein variable-resistance certain pin connects branch road power supply, and another determines the base stage that pin connects the first triode, and dynamic pin connects the base stage of the second triode; The collector electrode of the second triode as the output of constant-current source, grounded emitter.By the consecutive variations (0-10V exports and is used for the input of lamp control variable voltage) of the equivalent voltage input source as variable resistance, the output current in adjustment branch current source, exports continually varying branch current.Because the present invention accesses the first resistance and the second resistance in above-mentioned constant-current source, make the voltage between the base stage of the second triode and earth point relative to the proportional decay of variable-resistance output voltage, be conducive to the fine setting of branch current, the operating current of LED accurately can be set, extend the useful life of LED.
A kind of constant current driving governor of the present invention, connection bus current control circuit between bus bar resistance and load, in order to regulate input load bus current.Make bus current control circuit combine with special current constant control chip like this, hybrid package together afterwards, is conducive to element stability in use.
Accompanying drawing explanation
Fig. 1 is the structural representation of LED constant current driving governor of the present invention
Fig. 2 is that constant current chip of the present invention is to bus bar resistance voltage V
rsadjustment schematic diagram
Fig. 3 is to taking rear bus bar resistance voltage V after access leg of the present invention
rs' adjustment schematic diagram
Fig. 4 is the preferred version structural representation of branch road constant-current source of the present invention
Embodiment
Below in conjunction with accompanying drawing, the present invention will be described.
As shown in Figure 1, LED constant current driving governor of the present invention mainly comprises current constant control chip 1, bus current control circuit, LED load 3, bus bar resistance R
s, diode D
1, accumulation of energy inductance L
1with power supply VDD.Be switch mode constant current driving chip 6808 for current constant control chip 1, main the first pressure measurement pin 11 (power input VIN), the second pressure measurement pin 12 (voltage sample end CS) and the switch pin 13 (switch terminals DIM) using the first current constant control chip 1.The output connection bus resistance R of power supply VDD
sone end, bus bar resistance R
sthe other end connect the positive pole of LED load 3, the negative pole of LED load 3 connects accumulation of energy inductance L
1one end, accumulation of energy inductance L
1the other end connect diode D respectively
1positive pole and the switch pin 13 of current constant control chip 1, diode D
1negative pole be connected to bus bar resistance R
sand between power supply VDD.
Bus bar resistance R
sand connection bus current control circuit between LED load 3.Bus current control circuit comprises by branch resistance R
awith branch road electric capacity C
1the in parallel branch road formed, and the branch road constant-current source 2 of powering for branch road.。One end of branch road is connected to bus bar resistance R
sand connect between LED load 3, the other end connects branch road constant-current source 2, and branch road constant-current supply 2 is powered for branch road, is that branch road inputs branch current I
ra, at branch resistance R
aupper generation branch resistance voltage V
ra.First pressure measurement pin 11 is connected to bus bar resistance R
snear one end of power supply VDD, the second pressure measurement pin 12 connects the other end of branch road away from bus, and the first pressure measurement pin 11 and the second pressure measurement pin 12 take rear bus bar resistance voltage V for measuring
rs'
withbranch resistance voltage V
rasum.Branch road electric capacity C in the present embodiment
1be preferably 0.01 ~ 0.22 μ F, preferably 0.1 μ F, also can 0.001 μ F, adopt general high-reliability ceramic condenser; Branch resistance R
abe 0.5 ~ 2K Ω, preferred 1K Ω.
As shown in Figure 2, when the branch road constant-current source 2 of bus current control circuit is not to branch resistance R
athe branch road at place exports branch current I
ra, and time in the firm place in circuit of power supply VDD.First pressure measurement pin 11 and the second pressure measurement pin 12 detect bus bar resistance voltage V
rslower than minimum rated voltage V
min, switch pin 13 is opened, bus bar resistance voltage V
rs, LED load 3, accumulation of energy inductance L
1, current constant control chip 1 forms loop, bus bar resistance voltage V
rsraise gradually, accumulation of energy inductance L
1charging.When the first pressure measurement pin 11 of current constant control chip 1 and the second pressure measurement pin 12 detect bus bar resistance voltage V
rshigher than maximum rated voltage V
maxtime, switch pin 13 is closed, accumulation of energy inductance L
1electric discharge, diode D
1conducting, bus bar resistance voltage V
rs, LED load 3, accumulation of energy inductance L
1, diode D
1form loop, bus bar resistance voltage V
rsdecline gradually.When the first pressure measurement pin 11 of current constant control chip 1 and the second pressure measurement pin 12 detect bus bar resistance voltage V
rsbe down to minimum rated voltage V
mintime, switch pin 13 is opened, and repeats above-mentioned steps.Through the control of current constant control chip 1, make the electric current I of input LED load 3 positive pole
rsbe tending towards constant, reach the object that LED constant current is driven.
As shown in Figure 3, when the branch road constant-current source 2 of bus current control circuit is to branch resistance R
athe branch road at place exports branch current I
ra, branch resistance R
atake bus bar resistance R
sthe bus bar resistance voltage V at place
rs, make to take rear bus bar resistance voltage V
rs'+branch resistance voltage V
ra=bus bar resistance voltage V
rs, then the measured value between current constant control chip 1 first pressure measurement pin 11 and the second pressure measurement pin 12 is constant.As the branch current I that branch road constant-current source 2 exports
raduring size generation consecutive variations, branch resistance voltage V
raalso there is linear change thereupon.As branch current I
rabecome large, branch resistance voltage V
rawhen becoming large, take rear bus bar resistance voltage V
rs' diminish, thus the bus current I of input LED load 3 positive pole
rsalso diminish, the brightness step-down of LED; Otherwise, as branch current I
radiminish, the bus current I of input LED load 3 positive pole
rsbecoming large, uprising causing the brightness of LED.With this by continuous, the smooth adjustment of a ball bearing made using realization to LED luminance, the maximum rated voltage V after adjustment
maxreduce to V thereupon
max', minimum rated voltage V
minreduce to V thereupon
min'.
As shown in Figure 4, branch road constant-current source 2 of the present invention is preferably by the first triode 21, second triode 22, first resistance R
1, the second resistance R
2, variable resistor R
t, branch road power supply 23 form constant-current source.Wherein variable resistor R
tcertain pin connect branch road power supply 23, another determines the base stage that pin connects the first triode 21, and dynamic pin connects the first resistance R
1one end; Second resistance R
2two ends respectively with the first resistance R
1the other end be connected with the base stage of the first triode 21, and the first resistance R
1the other end be also connected with the base stage of the second triode 22; The collector electrode of the first triode 21 in the base stage of oneself, grounded emitter; The collector electrode of the second triode 22 as the output of branch road constant-current source 2, emitter by a grounding through resistance, the preferred 20K Ω of this resistance.The first resistance R in the present embodiment
1be 300 ~ 600K Ω, preferred 400K Ω; Second resistance R
2be 70 ~ 150K Ω, preferred 100K Ω.
First triode 21 can be replaced a diode, wherein the positive pole of diode and variable-resistance R
tanother is determined pin and connects, and the positive pole of diode is connected to the base stage of the second triode 22 and variable-resistance R simultaneously
tbetween dynamic pin, the minus earth of diode.
It should be pointed out that the above embodiment can make the invention of those skilled in the art's comprehend, but do not limit the present invention in any way creation.Therefore; although this specification has been described in detail the invention with reference to drawings and Examples; but; those skilled in the art are to be understood that; still can modify to the invention or equivalent replacement; in a word, all do not depart from technical scheme and the improvement thereof of the spirit and scope of the invention, and it all should be encompassed in the middle of the protection range of the invention patent.
Claims (10)
1. one kind uses the LED light source of constant current driving governor, it is characterized in that: the load be connected with described constant current driving governor is LED load, described constant current driving governor comprises bus current control circuit, described bus current control circuit comprises branch resistance, branch road electric capacity and branch current source, and wherein said branch resistance and branch road Capacitance parallel connection form branch road; One end of described branch road is connected between bus bar resistance and load, and the other end connects described branch current source; Described branch current source exports the adjustable electric current of size to described branch road; Described constant current driving governor also comprises current constant control chip, bus bar resistance, the second diode and accumulation of energy inductance, and described current constant control chip comprises the first pressure measurement pin, the second pressure measurement pin and switch pin; The two ends of described bus bar resistance connect the positive pole of power supply and load respectively, the negative pole of load connects one end of described accumulation of energy inductance, the other end of described accumulation of energy inductance connects the positive pole of described second diode and described switch pin, and described first pressure measurement pin is connected between described bus bar resistance and described power supply; The one end of the branch road be made up of branch resistance and branch road Capacitance parallel connection in described bus current control circuit is connected between bus bar resistance and load, and the branch road other end connects described second pressure measurement pin; Voltage sum on voltage on described bus bar resistance and described branch resistance remains unchanged.
2. LED light source as claimed in claim 1, is characterized in that: described branch road electric capacity is 0.01 ~ 0.22 μ F, and described branch resistance is 0.5 ~ 2K Ω; Described branch current source is a constant-current source.
3. LED light source as claimed in claim 1 or 2, is characterized in that: described constant-current source comprises the first triode, the second triode, equivalent voltage input source, branch road power supply; Wherein variable-resistance certain pin connects described branch road power supply, and another determines the base stage that pin connects described first triode, and dynamic pin connects the base stage of described second triode; The base stage of described first triode is also connected between the base stage of described second triode and described dynamic pin, the collector electrode of described first triode in the base stage of oneself, grounded emitter; The collector electrode of described second triode as the output of described constant-current source, grounded emitter.
4. LED light source as claimed in claim 3, it is characterized in that: described first triode can be replaced the first diode, the positive pole of wherein said first diode is determined to be connected between the base stage of pin and described second triode and described dynamic pin with described another simultaneously, the minus earth of described first diode, described equivalent voltage input source is variable resistor or other variable voltage input circuits.
5. LED light source as claimed in claim 4, it is characterized in that: it also comprises the first resistance and the second resistance, described first resistance is connected between the base stage of described second triode and described dynamic pin; One end of described second resistance is connected between the base stage of described first resistance and described second triode, and the other end is connected on another dynamic pin described.
6. LED light source as claimed in claim 4, is characterized in that: the emitter of described second triode is by a grounding through resistance.
7. LED light source as claimed in claim 1, is characterized in that: described first pressure measurement pin, the second pressure measurement pin are for measuring the voltage between described bus bar resistance and described branch resistance.
8. the LED light source as described in claim 1 or 7, is characterized in that: described current constant control chip is switch mode constant current driving chip.
9. LED light source as claimed in claim 8, is characterized in that: described first pressure measurement pin is the power input of described switch mode constant current driving chip.
10. LED light source as claimed in claim 9, is characterized in that: described current constant control chip, bus bar resistance, the second diode and accumulation of energy inductance carry out hybrid package.
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|---|---|---|---|
| CN201410497159.9A CN105517269B (en) | 2014-09-25 | 2014-09-25 | A kind of LED light source using constant current drive control device |
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|---|---|---|---|
| CN201410497159.9A CN105517269B (en) | 2014-09-25 | 2014-09-25 | A kind of LED light source using constant current drive control device |
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| CN105517269A true CN105517269A (en) | 2016-04-20 |
| CN105517269B CN105517269B (en) | 2017-12-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112730949A (en) * | 2020-12-21 | 2021-04-30 | 唐新颖 | High anti-interference Hall sensor |
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| US20110309754A1 (en) * | 2007-08-07 | 2011-12-22 | Koninklijke Philips Electronics N.V. | Method and apparatus for discriminating modulated light in a mixed light system |
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| CN103124461A (en) * | 2013-01-21 | 2013-05-29 | 厦门海莱照明有限公司 | LED linear intelligent dimming module |
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| US20110309754A1 (en) * | 2007-08-07 | 2011-12-22 | Koninklijke Philips Electronics N.V. | Method and apparatus for discriminating modulated light in a mixed light system |
| CN102711307A (en) * | 2011-03-28 | 2012-10-03 | 海洋王照明科技股份有限公司 | Dimmable light-emitting diode (LED) drive circuit and lamp |
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Cited By (2)
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| CN112730949A (en) * | 2020-12-21 | 2021-04-30 | 唐新颖 | High anti-interference Hall sensor |
| CN112730949B (en) * | 2020-12-21 | 2024-06-07 | 唐新颖 | High anti-interference Hall sensor |
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| CN105517269B (en) | 2017-12-15 |
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Effective date of registration: 20200622 Address after: Room 906, 16W building, science and technology Avenue West, Pak Shek Kok Science Park, Hong Kong, China Patentee after: Delight Innovative Technologies Ltd. Address before: 518000 Guangdong city of Shenzhen province Qianhai Shenzhen Hong Kong cooperation zone before Bay Road No. 1 building 201 room A Patentee before: Nine wise control technology (Shenzhen) Co.,Ltd. |