CN107708258A - A kind of LED drive circuit based on active ripple compensation - Google Patents
A kind of LED drive circuit based on active ripple compensation Download PDFInfo
- Publication number
- CN107708258A CN107708258A CN201710994279.3A CN201710994279A CN107708258A CN 107708258 A CN107708258 A CN 107708258A CN 201710994279 A CN201710994279 A CN 201710994279A CN 107708258 A CN107708258 A CN 107708258A
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- resistance
- led
- circuit
- ripple compensation
- ripple
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
Abstract
The present invention proposes a kind of active ripple compensation BUCK type LED drive circuits, the current ripples of ripple compensation circuit output with it is equal in magnitude on the current ripples waveform on the BUCK circuit outputs inductance, opposite polarity, so that the output end of BUCK circuits is without using big capacity electrolyte capacitor, required low capacity electric capacity can use the less novel long-life electric capacity of energy density, suppress output ripple electric current using active compensation technology.Due to cancelling the use of electrochemical capacitor, circuit lifetime can be increased, stability improves, and is easy to integrate, circuit easily minimizes.
Description
Technical field
The invention belongs to technical field of LED illumination, and in particular to a kind of LED drive circuit based on active ripple compensation.
Background technology
LED has the advantages that energy-efficient, green, long lifespan, gets more and more people's extensive concerning, if can be shone with LED
Bright substitution is inefficient at present, the traditional lighting of highly energy-consuming, will alleviate current more and more urgent energy shortage and environmental degradation is asked
Topic.Because LED itself photoelectric characteristic needs to drive LED with special power supply.At present, LED drive power is mainly used and opened
Powered-down source, switch power supply output current ripple is larger, and ripple can produce unfavorable shadow to LED luminous efficiency, life-span, colour temperature etc.
Ring.Switching Power Supply is generally filtered using electrochemical capacitor, and electrochemical capacitor life has had a strong impact on the reliability of LED drive power.
Therefore the use of electrochemical capacitor is reduced, reduces output current ripple and is significant for development LED illumination cause.
For traditional LED drive circuit as shown in figure 1, being driven using BUCK circuits, BUCK circuits are also referred to as buck change
Parallel operation, it is the single tube not isolated DC converter that a kind of output voltage is less than input voltage.Filtered for BUCK circuits using LC
Ripple, during circuit steady operation, output voltage is made up of small ripple and larger DC component.When driving LED, ripple
Voltage will cause larger LED ripple currents.Increase filter capacitor can reduce LED ripple current.But capacitance
Increase, cause power volume and weight increase, influence the miniaturization of power supply and integrated, it is often more important that, electrochemical capacitor into
To limit the principal element in LED drive power life-span.In the case where LED illuminates application environment, the life-span of electrochemical capacitor is no more than
10000 h, it is difficult to match with LED long-life (100000h or so).
The content of the invention
To solve the above problems, the present invention proposes the novel power supply for blending Switching Power Supply and linear power supply, the power supply
Efficient energy transmission is realized using Switching Power Supply, while suppresses output current ripple using linear power supply to substitute electrolysis electricity
Capacitor filter.The output ripple of the novel power supply is small, no big capacity electrolyte capacitor, uses semiconductor element and integrated chip, easily more
Realize miniaturization and it is integrated, improve the reliability of driving power.
Technical scheme is as follows：
A kind of LED drive circuit, including DC-DC circuit and ripple compensation circuit, the DC-DC circuit are used to provide the LED
Driving current, it is characterised in that the ripple compensation circuit be used for the driving current carry out ripple compensation.
The output end of the DC-DC circuit does not have filter capacitor, and the ripple compensation circuit make it that the driving current is
Direct current without ripple component.
The DC-DC circuit is BUCK circuits, the current ripples of the ripple compensation circuit output and the BUCK circuits
Equal in magnitude, opposite polarity on current ripples waveform on outputting inductance.
Output end one sampling resistor R of series connection of the outputting inductance, by being sampled to the electric current on the resistance R
Feedback, realize and ripple compensation is carried out to the electric current on the outputting inductance.
The BUCK circuits include metal-oxide-semiconductor S, diode D, inductance L2, and the drain electrode of the metal-oxide-semiconductor connects input power positive pole,
The source electrode of the metal-oxide-semiconductor connects diode D negative electrode, and the anode of the diode D connects input power negative pole, and the one of the inductance L2
Terminate the negative electrode of the diode D, the input of another termination ripple compensation circuit, the output of the ripple compensation circuit
The anode of the LED is terminated, the negative electrode of the LED connects input power negative pole.
The ripple compensation circuit includes sampling resistor Rs, resistance R1, resistance R2, resistance R3, resistance Rc, electric capacity C1, electricity
Hold C2, amplifier A1, PNP triode Q1, NPN triode Q2, the resistance Rs a termination inductance L2 the other end, institute
State resistance Rs another termination LED anode；One end of the resistance Rs meets amplifier A1 by electric capacity C1 and resistance R1
Inverting input, the other end of the resistance Rs connects amplifier A1 in-phase input end by resistance R2；The triode Q1
Colelctor electrode connect -12V power supplys, the emitter stage of triode Q1 emitter stage and triode Q2 links together, and tie point is as pushing away
Draw output；Triode Q2 colelctor electrode connects input power negative pole, and triode Q1 and Q2 base stage are all defeated with the amplifier A1
Go out end connection；Resistance R3 one end connects the recommending output mode, other end connection amplifier A1 inverting input, electric capacity C2 one end
Connect amplifier A1 in-phase input end, another termination input power negative pole；Resistance Rc mono- terminates recommending output mode, another termination institute
State LED anode.
The present invention has advantages below：
Outputting inductance current ripples can be fully compensated using active ripple compensation circuit by the present invention so that circuit output is constant
Direct current.This New LED driving power is without big electrochemical capacitor, and output ripple is small, and the reliability and service life of circuit can
Greatly improve, this is significant for LED illumination development.
Brief description of the drawings
Fig. 1 is traditional BUCK circuit diagrams；
Fig. 2 is active ripple compensation BUCK type schematic diagrams；
Fig. 3 is active ripple compensation principle oscillogram；
Fig. 4 is active ripple compensation BUCK type circuit diagrams；
Fig. 5 is LED illumination electric power system structure chart.
Embodiment
Below in conjunction with specific embodiment, the present invention will be described, and each embodiment is merely to illustrate the technical side of the present invention
Case, rather than its limitations.
Active ripple compensation Buck circuit topological structures proposed by the present invention switching tubes S as shown in Figure 2, inductance L
With the Buck type main circuits of sustained diode composition no electrolytic capacitor, continuous conduction mode is worked in;At triode T
Inductance ripple current is compensated in magnifying state so that the electric current by LED lamp groups is direct current.
If main circuit inductive current iL and triode T compensation electric current iC is respectively
In formula：IL and IC is that DC component, ir and the iC of inductive current and triode T collector current are respectively them respectively
AC compounent（Ripple current）.
WhenWhen, circuit output current is
It is Constant Direct Current by LED, as illustrated, realizing the full compensation to inductance ripple current.
Wherein：IP and IG is the peak value and valley of inductive current respectively.
Active ripple compensation principle oscillogram is as shown in figure 3, its output of the BUCK types translation circuit of visible band ripple compensation
Electric current iO is the direct current of ripple very little, and its output result is especially suitable for driving LED.
The detailed circuit diagram of BUCK types conversion with ripple compensation, as shown in figure 4,
The BUCK circuits include metal-oxide-semiconductor S, diode D, inductance L2, and the drain electrode of the metal-oxide-semiconductor connects input power positive pole, described
The source electrode of metal-oxide-semiconductor connects diode D negative electrode, and the anode of the diode D connects input power negative pole, a termination of the inductance L2
The negative electrode of the diode D, the input of another termination ripple compensation circuit, the output termination of the ripple compensation circuit
The anode of the LED, the negative electrode of the LED connect input power negative pole.The ripple compensation circuit includes sampling resistor Rs, resistance
R1, resistance R2, resistance R3, resistance Rc, electric capacity C1, electric capacity C2, amplifier A1, PNP triode Q1, NPN triode Q2, the electricity
Hinder the Rs termination inductance L2 other end, another termination LED of resistance Rs anode；The resistance Rs's
One end connects amplifier A1 inverting input by electric capacity C1 and resistance R1, and the other end of the resistance Rs is connect by resistance R2 to be put
Big device A1 in-phase input end；The colelctor electrode of the triode Q1 meets -12V power supplys, triode Q1 emitter stage and triode Q2
Emitter stage link together, tie point is as recommending output mode；Triode Q2 colelctor electrode meets input power negative pole, triode Q1
It is connected with output end of the Q2 base stage all with the amplifier A1；Resistance R3 one end connects the recommending output mode, other end connection
Amplifier A1 inverting input, electric capacity C2 one end connection amplifier A1 in-phase input end, another termination input power negative pole；
Resistance Rc mono- terminates recommending output mode, another termination LED anode.
As long as ripple compensation circuit is designed accordingly so that the output current iC of compensation circuit can be accurate rapidly
Tracking inductance ripple component ir, equal in magnitude, opposite polarity, i.e.,, as shown in figure 3, with regard to that can reach to output
The compensation effect of electric current, it is the direct current without ripple component to make output current.
Blocked portion is active ripple compensation circuit part in Fig. 4, and this new-type circuit can be considered as Switching Power Supply and line
Property power supply combination, while efficient energy conversion is completed using Switching Power Supply, using linear circuit suppression circuit ripple,
Realize the high reliability long-life LED drivings that efficiency is high, ripple is small.
On traditional BUCK circuit bases, remove filter capacitor, with the linear ripple circuit of auxiliary to inductance L ripples electricity
Stream compensates.The output current of amplifier is generally tens milliamperes, and ripple current is mended typically at hundreds of milliamperes or so for guarantee
Repaying circuit can be worked, and expansion stream is carried out to it using power amplification circuit.
When circuit normal work, if small disturbance occurs for load, disturbance voltage can be fed back to computing and put by feedback line
Big device, due to using negative-feedback, then amplifier can adjust gain offsets the influence of disturbance in the opposite direction automatically.Cause
This negative-feedback can also increase the stability of circuit, strengthen antijamming capability.So can not only solve to hand over using negative-feedback method
More problem of dtmf distortion DTMF, while can also increase the stability of circuit.
Whole active ripple compensation emergency lighting device mainly has battery pack, active ripple compensation device and LED three
It is grouped into, as shown in Figure 5.
Active ripple compensation emergency lighting device is simple in construction, only increases ripple compensation portion on the basis of traditional circuit
Point, the direct current that can provide output ripple very little provides power supply, voltage stabilization for LED.
The present invention removes the device in this shortening LED power life-span of electrochemical capacitor so that the service life of LED power obtains
Significantly increase, be greatly saved the expense that mains lighting supply is spent of changing.Electrochemical capacitor volume is big, with semiconductor and collection
Replaced into chip, it is possible to achieve minimize and integrated, improve the reliability of driving power.Meanwhile the present invention without using
Big capacity electrolyte capacitor, required low capacity electric capacity can use the less novel long-life electric capacity of energy density, using having
Source compensation technique suppresses output ripple electric current.Meanwhile power provided by the invention is big, LED light group can be driven, power supply is more steady
It is fixed so that LED luminous power gets a promotion, using the teaching of the invention it is possible to provide bigger intensity of illumination so that application scenario is more extensive.
Finally it should be noted that：Above-described embodiments are merely to illustrate the technical scheme, rather than to it
Limitation；Although the present invention is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：
It can still modify to the technical scheme described in previous embodiment, or which part or all technical characteristic are entered
Row equivalent substitution；And these modifications or substitutions, the essence of appropriate technical solution is departed from various embodiments of the present invention technical side
The scope of case.
Claims (7)
1. a kind of LED drive circuit, including DC-DC circuit and ripple compensation circuit, the DC-DC circuit is described for providing
LED driving current, it is characterised in that the ripple compensation circuit is used to carry out ripple compensation to the driving current.
2. LED drive circuit according to claim 1, it is characterised in that the output end of the DC-DC circuit does not filter
Electric capacity, the ripple compensation circuit make it that the driving current is the direct current without ripple component.
3. LED drive circuit according to claim 1, it is characterised in that the DC-DC circuit is BUCK circuits, described
The current ripples of ripple compensation circuit output and equal in magnitude, pole on the current ripples waveform on the BUCK circuit outputs inductance
Property is opposite.
4. LED drive circuit according to claim 3, it is characterised in that the output end of the outputting inductance is connected one
Sampling resistor R, by carrying out sampling feedback to the electric current on the resistance R, realize and the electric current on the outputting inductance is carried out
Ripple compensation.
5. LED drive circuit according to claim 3, it is characterised in that the BUCK circuits include metal-oxide-semiconductor S, diode
D, inductance L2, the drain electrode of the metal-oxide-semiconductor connect input power positive pole, and the source electrode of the metal-oxide-semiconductor connects diode D negative electrode, and described two
Pole pipe D anode connects input power negative pole, a termination diode D of inductance L2 negative electrode, another termination line
The input of ripple compensation circuit, the output of the ripple compensation circuit terminate the anode of the LED, and the negative electrode of the LED connects defeated
Enter power cathode.
6. LED drive circuit according to claim 5, it is characterised in that the ripple compensation circuit includes sampling resistor
Rs, resistance R1, resistance R2, resistance R3, resistance Rc, electric capacity C1, electric capacity C2, amplifier A1, PNP triode Q1, NPN triode
Q2, the resistance Rs termination inductance L2 other end, another termination LED of resistance Rs anode；Institute
The one end for stating resistance Rs connects amplifier A1 inverting input by electric capacity C1 and resistance R1, and the other end of the resistance Rs passes through
Resistance R2 connects amplifier A1 in-phase input end；The colelctor electrode of the triode Q1 connects -12V power supplys, triode Q1 emitter stage
Linked together with triode Q2 emitter stage, tie point is as recommending output mode；Triode Q2 colelctor electrode connects input power and born
Pole, the output end of triode Q1 and Q2 base stage all with the amplifier A1 are connected；Resistance R3 one end connects the recommending output mode,
Other end connection amplifier A1 inverting input, electric capacity C2 one end connection amplifier A1 in-phase input end, another termination are defeated
Enter power cathode；Resistance Rc mono- terminates recommending output mode, another termination LED anode.
7. a kind of LED electric power systems, powered by battery pack and active ripple compensation device to LED, it is characterised in that described to have
Source ripple compensation device includes the LED drive circuit as any one of claim 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710994279.3A CN107708258A (en) | 2017-10-23 | 2017-10-23 | A kind of LED drive circuit based on active ripple compensation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710994279.3A CN107708258A (en) | 2017-10-23 | 2017-10-23 | A kind of LED drive circuit based on active ripple compensation |
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| Publication Number | Publication Date |
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| CN107708258A true CN107708258A (en) | 2018-02-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710994279.3A Pending CN107708258A (en) | 2017-10-23 | 2017-10-23 | A kind of LED drive circuit based on active ripple compensation |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106793342A (en) * | 2017-02-15 | 2017-05-31 | 江南大学 | A kind of long-life LED drive power based on ripple compensation |
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- 2017-10-23 CN CN201710994279.3A patent/CN107708258A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106793342A (en) * | 2017-02-15 | 2017-05-31 | 江南大学 | A kind of long-life LED drive power based on ripple compensation |
Non-Patent Citations (2)
| Title |
|---|
| 唐治德等: "《峰值电流控制的有源纹波补偿Buck型LED驱动电源》", 《华南理工大学学报(自然科学版)》 * |
| 唐治德等: "有源纹波补偿BUCK型LED驱动电源", 《重庆大学学报》 * |
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Application publication date: 20180216 |
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