CN106163011A - Become compensation circuit and LED constant-power power source that constant current IC is invariable power IC - Google Patents
Become compensation circuit and LED constant-power power source that constant current IC is invariable power IC Download PDFInfo
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- CN106163011A CN106163011A CN201610716986.1A CN201610716986A CN106163011A CN 106163011 A CN106163011 A CN 106163011A CN 201610716986 A CN201610716986 A CN 201610716986A CN 106163011 A CN106163011 A CN 106163011A
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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
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Abstract
The present invention relates to become compensation circuit and the LED constant-power power source that constant current IC is invariable power IC.The compensation circuit that the change constant current IC of the present invention is invariable power IC includes linear voltage-controlled rheostat, manostat；It may be added in arbitrary constant current LED driving power source, easily realize LED power upgrading from constant current to invariable power, and this invariable power compensation circuit is without single-chip microcomputer, without computing circuit, circuit is simple, low cost, low in energy consumption, easy to control, length in service life, reliability height.The LED Constant-power drive power supply of the present invention uses the constant current source driving chip of existing maturation, it is not required to again develop power drives chip, only it is to increase simple offset peripheral circuit, simple constant-current driving characteristic just can be upgraded to the Constant-power drive characteristic of high-quality, low cost.It according to the different operating voltage of LED, can adjust the operating current of LED automatically, and power stability is constant, has reached output subject range width, the purpose of power supply highly versatile.
Description
Technical field
The present invention relates to electronic technology field, particularly relate to become compensation circuit and the LED perseverance merit that constant current IC is invariable power IC
Rate power supply.
Background technology
In recent years, LED is as new generation of green illuminating product, it is thus achieved that swift and violent development.LED yield unusually brilliant results same
Time, LED drive power then becomes the stable core with development of LED industry, and the quality of LED power directly constrains LED product
Reliability.Owing to LED is the sensitive semiconductor device of characteristic, there is again negative temperature characteristic, thus need in application process right
Its duty carries out stablizing and protecting, thus just has the most commonly used constant-current source being different from common voltage source.
LED drive power is common mains supply (AC:110/120/220/230/240/277V, 50/60Hz), or
DC source (DC:5,12,24,48V etc.) voltage-type power supply, by certain electronic circuit, to ensure LED constant light emitting
LED electric energy supply circuit.Most employing constant-current source power supplys.LED constant current source power supply, it is avoided that LED is because of just
The current variation changed to voltage and cause, and it is not required to current-limiting resistance, cost is relatively low, and efficiency is high.Yet with current market
On LED luminescence chip there is plurality of specifications, such as: being the COB light source (chip) of the LED of 50W equally, conventional just has 30V,
36V, 39V, 45V, 52V, 55V, 72V etc., with point source combination, every 3 volts one grade, generally have people's use from 3-210V, and
The COB of the same specification of same manufacturer production or point source, on its voltage, lower deviation also can be more than 10%, additionally, same core
Sheet, its ambient temperature is different, and voltage also has the upper lower deviation of more than 5%, drives supplier accordingly, as LED constant current, there is kind
Class is various, stock's difficulty, the serious problems such as the production cycle is long, as LED lamp factory, there is also with high-precision constant-current source raw
The whole lamp product produced, the problem that the concordance of its power accuracy is the highest.The concordance of product to be ensured, or, light source is entered
The strict screening of row, this can cause light source cost to improve；When producing to driving parameter to be finely adjusted, this can cause producing into
This raising.Especially outdoor water-proof encapsulating power supply, cost and the difficulty of adjustment are the biggest.
Therefore, at present everybody to start to develop versatility higher, the higher LED drive power of product power accuracy, i.e. permanent merit
Rate source.Constant power source according to the size of LED both end voltage, can automatically adjust the size of output electric current, make the voltage at LED two ends with
The product of electric current keeps constant, i.e. the power that LED obtains is in rated range, at AC(input AC), DC(export direct current), Ta
Can remain constant during (ambient temperature) change.
The people being currently undertaken by this project development has much, has summed up three major types type: one is that power is the most stable
Quasi-constant-current source be described as Constant-power drive, that is not constant power source truly, such as the patent No.:
CN200910109423.6、CN200920134845.4；Two is directly to detect output voltage electric current with single-chip microcomputer and transport
Calculate, the real constant-power power source that then switch tube is controlled, such as the patent No.: CN201120008330.7,
CN201310179274.2、CN201420725588.2、CN201210005035.5；Three is to propose some to realize constant power source
Perception or control method, such as the patent No.: CN201520227273.X, CN201610010112.4, CN201410056655.0,
These perception or the method for control, essence is also a kind of single-chip microcomputer operation method, the most peripheral or overall structure be slightly different and
?.
Up till now to this end, the patent of application invariable power is many, but be really applied in reality circuit few, be used in family
Outer is the most few.Reason is: the method using single-chip microcomputer, although it is, in principle, that the most accurate, most scientific.But realize application
In be but difficult: one, common single-chip microcomputer is to design, if it directly being used for indoor, direct current, the circuit of weak signal
Have 3 deficiencies in alternating current large-power power supply: one is that capacity of resisting disturbance is not enough, easily crash, out of control；Two is temperature adaptation scope
Deficiency, in the environment of ＜-25 DEG C and ＞ 85 DEG C, it is impossible to normally working, outdoor power system is preferably at-50 DEG C of-+105 DEG C of (power supplys
In box) can be preferable；Three is easily to be lost efficacy by the electromagnetic interference of strong signal.Two, single-chip microcomputer cost meeting that is professional or that customize
The highest, specialty or customization single-chip microcomputer, because amount is few, puts into software development and the cost made is the highest, client is beyond affordability.
If common single-chip microcomputer is used for low-power LED indoor power supply by three, because the cost of small-power constant-current source is extremely low, client is to small-power
The cost of power supply is the most sensitive, is difficult to the most equally promote.Four, develop special Constant-power drive chip, be individual good
Select, but apply from exploitation to maturation, need the ability on probation spending a few year ripe, and after maturation, the price of IC is also required to
Several years just can be reduced to compare the cost being easy to promote.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, improve the versatility of LED drive power, reliable
Property and expand the scope of application, reduce cost, the invention provides and become the compensation circuit and LED invariable power that constant current IC is invariable power IC
Power supply.
The technical solution used in the present invention is: become the compensation circuit that constant current IC is invariable power IC, it is characterised in that include line
Property voltage-controlled rheostat, manostat；The power input of manostat meets node A, and power output end meets node C, and reference edge is (public
End) meet node B；Linear voltage-controlled rheostatic terminated nodes C, other end ground connection, the 3rd terminated nodes CS, i.e. C and ground are electricity
Buckling input, CS is resistance variations outfan with ground；Electrochemical capacitor C1Positive pole one terminated nodes A, other end ground connection,
Electric energy is provided for compensating circuit；Electrochemical capacitor C2Negative pole one terminated nodes B, other end ground connection, be used for obtaining constant power output
The proportional sample of voltage, is sampled output voltage；Diode D1Negative pole one terminated nodes A, other end wiring circle f1Dynamic
State end；Coil f1Other end ground connection；Coil f2One end ground connection, another terminating diode D2Negative pole one end；Diode D2's
Another terminated nodes B.
Further, described linear voltage-controlled rheostat includes audion BG1With audion BG2, audion BG1Colelctor electrode
C1With base stage b1Connect node D, emitter e simultaneously1Connecting resistance R1One end；Audion BG2Colelctor electrode C2Connect node CS, emitter stage
e2Connecting resistance R2One end, base stage b2Meet node D；Resistance R0Terminated nodes C, another terminated nodes D；Resistance R2The other end
Ground connection；Resistance R1Other end ground connection.
Further, described audion BG1With audion BG2For the NPN type triode of identical characteristics, it it is high-amplification-factor
Low tension switch pipe.
Further, described LED constant-power power source include AC power supplies input, electric fuse F, EMC unit, bridge rectifier,
Invariable power compensates circuit, constant current IC unit, transformator and DC output rectifier and filter；The input of described AC power supplies and EMC unit
Connect, between AC power supplies input and EMC unit, be additionally provided with electric fuse F；Described EMC unit connects with bridge rectifier；Bridge-type
Positive output terminated nodes N of commutator3；Coil f3One termination field effect transistor Q1Drain electrode, another terminated nodes N3；Field effect
Pipe Q1Grid connect constant current IC unit driving control end, source electrode meets sample resistance RSOne end, sample resistance RSThe other end
Ground connection；Resistance RCOne end meet sample resistance RSOne end, another terminated nodes CS；Electric capacity C3Terminated nodes N3, the other end
Ground connection；Constant current IC unit the second end is current sampling input, connects node CS, the 3rd terminated nodes N5, the 4th end ground connection；Coil
f4A terminating diode D3One end of positive pole, another terminated nodes N2, electrochemical capacitor C4Positive pole one terminated nodes N1, electric capacity
C4Another terminated nodes N2, diode D3Another terminated nodes N1.Node N1With node N2For connecting LED illumination device,
I.e. constant power output end.Invariable power compensates circuit the first terminated nodes N5, the second termination coil f2One end, i.e. dynamic end, the 3rd
Terminated nodes CS, the 4th end ground connection；Coil f2Other end ground connection；Coil f1Terminated nodes N5, other end ground connection.
Advantages of the present invention: the invariable power that (1) present invention uses compensates electricity and may be added to arbitrary constant current LED driving power source
In, easily realize LED power upgrading from constant current to invariable power, and this invariable power compensates circuit without single-chip microcomputer, without
Computing circuit, circuit is simple, low cost, power consumption are little, easy to control, length in service life, reliability are high.(2) the LED perseverance merit of the present invention
Rate drives power supply according to the different operating voltage of LED, can automatically adjust the operating current of LED, makes I, U product (merit of LED
Rate) to stablize constant, the most whole lamp power does not changes with AC voltage, D/C voltage, the change of ambient temperature.So, not only increase
A power supply adapts to same power but the versatility of the LED light source of different size automatically, and overcome same specification LED light source because of
Normal voltage deviation or variation of ambient temperature and the highest problem of whole lamp power concordance (precision) that causes.(3) use existing
Ripe constant current source driving chip, without again developing the driving chip of power supply, is only to increase simple offset peripheral
Circuit, just can upgrade to the Constant-power drive characteristic of high-quality, low cost by simple constant-current driving characteristic.(4) output adapts to model
Enclose width, highly versatile.
Accompanying drawing explanation
Fig. 1 is the compensation circuit block diagram that the change constant current IC of the present invention is invariable power IC.
Fig. 2 is the linear voltage-controlled rheostatic circuit theory compensating circuit that the change constant current IC of the present invention is invariable power IC
Figure.
Fig. 3 is the circuit theory diagrams of the invariable power LED drive power embodiment of the present invention.
Fig. 4 is to become the equivalent circuit diagram compensating circuit that constant current IC is invariable power IC.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, right
The present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, and
It is not used in the restriction present invention.
As shown in Figure 1: become constant current IC be invariable power IC compensation circuit, it is characterised in that include linear voltage-controlled rheostat 6,
Manostat 5；The power input of manostat 5 meets node A, and power output end meets node C, and reference edge (common port) meets node B；
One terminated nodes C of linear voltage-controlled rheostat 6, other end ground connection, the 3rd terminated nodes CS, i.e. C input for change in voltage with ground
End, CS is resistance variations outfan with ground；Electrochemical capacitor C1Positive pole one terminated nodes A, other end ground connection, for compensate circuit carry
For electric energy；Electrochemical capacitor C2Negative pole one terminated nodes B, other end ground connection, for obtaining the ratio sample of constant power output voltage
This, be sampled output voltage；Diode D1Negative pole one terminated nodes A, other end wiring circle f1Dynamic end；Coil f1
Other end ground connection；Coil f2One end ground connection, another terminating diode D2Negative pole one end；Diode D2Another termination joint
Point B.
F in circuit1It is the work feedback coil of common constant current IC, provides work energy, transformator work shape for constant current IC
The information such as state and output voltage.In invariable power compensates circuit, utilize this coil, pass through D1Rectification and C1Accumulation of energy, for this compensation electricity
Road provides work energy.f2It is the invariable power IC feedback coil that compensates that circuit is newly-increased, it is therefore an objective to obtain the sampling electricity of output voltage
Pressure.Pass through D2Rectification and C2Accumulation of energy, UC2It is output voltage UDCSampling voltage.
Manostat kind is a lot, explanation as a example by coming with the simplest 3 fixed stably depressors of end here.As it is shown in figure 1, manostat
3 ends respectively A, B, C；A is manostat power input, and C is manostat power output end, and B is manostat reference edge.Wherein,
A and C1Positive pole connects, B and C2Negative pole connect rather than directly with being signally connected of routine, it is therefore an objective to make manostat export
UCBWith UC2Form a subtractor, obtain UCVoltage, UC=UCB-UC2?.Visible, UCBIt is fixed voltage, UC2It it is output voltage
Sampling voltage, with output voltage UDCRising and raise.UCJust with UC2On the contrary, i.e. UDCOutput voltage is the highest, UCOutput electricity
Press the lowest.
The most described linear voltage-controlled rheostat includes audion BG1With audion BG2, audion BG1Colelctor electrode
C1With base stage b1Connect node D, emitter e simultaneously1Connecting resistance R1One end；Audion BG2Colelctor electrode C2Connect node CS, emitter stage
e2Connecting resistance R2One end, base stage b2Meet node D；Resistance R0Terminated nodes C, another terminated nodes D；Resistance R2The other end
Ground connection；Resistance R1Other end ground connection.Described audion BG1With audion BG2For the NPN type triode of identical characteristics, it is that height is put
The low tension switch pipe of big multiple.
The most described LED constant-power power source includes AC power supplies input, electric fuse F, EMC unit 1, bridge rectifier
2, invariable power compensates circuit 3, constant current IC unit 4, transformator T and DC output rectifier and filter 7；Described AC power supplies input with
EMC unit 1 connects, and is additionally provided with electric fuse F between AC power supplies input and EMC unit 1；Described EMC unit 1 and bridge rectifier
2 connect；Positive output terminated nodes N of bridge rectifier 23；Coil f3One termination field effect transistor Q1Drain electrode, another terminates joint
Point N3；Field effect transistor Q1Grid connect constant current IC unit 4 driving control end, source electrode meets sample resistance RSOne end, sampling electricity
Resistance RSOther end ground connection；Resistance RCOne end meet sample resistance RSOne end, another terminated nodes CS；Electric capacity C3A termination
Node N3, other end ground connection；Constant current IC unit 4 second end is current sampling input, connects node CS, the 3rd terminated nodes N5, the
Four end ground connection；Coil f4A terminating diode D3One end of positive pole, another terminated nodes N2, electrochemical capacitor C4Positive pole one end
Meet node N1, electric capacity C4Another terminated nodes N2, diode D3Another terminated nodes N1.Node N1With node N2For even
Connect LED illumination device, i.e. constant power output end.Invariable power compensates circuit the first terminated nodes N5, the second termination coil f2One
End, i.e. dynamic end, the 3rd terminated nodes CS, the 4th end ground connection；Coil f2Other end ground connection；Coil f1Terminated nodes N5,
Other end ground connection.
It is briefly described below becoming constant current IC the embodiment principle of invariable power IC: as shown in Figure 4: common constant current IC is just
Often output characteristics is no matter AC change in voltage or D/C voltage change, and the current value of DC end output is the most constant, i.e. exports
60V is 1A, exports about 50V, and even during about 30V, electric current is also 1A.Want now the constant current output characteristic of IC becomes permanent merit
Rate output characteristics, simplest principle is: RSThe sampling voltage at two ends can reducing and linearly increase with output dc voltage automatically,
For realizing this principle, a variable resistance R can be accessed between CS and signal groundU, between CS and S, seal in one fix
RCAs long as the most suitably changing RUValue, just can change the output current value of DC.If RUThe change of value just realize Uout with
The product of Iout keeps constant, then, this constant current IC has reformed into invariable power IC.Therefore the key of the present invention must also solve RU
Automatic variation issue.
The output characteristics of invariable power is: the product of Uout with Iout keeps constant.Such as, the constant-power power source of 60W, Uout
=60V,Iout=1A; Uout=50V,Iout=1.2A; Uout=40V,Iout=1.5A; Uout=30V,Iout=2A……P=
UI, P are steady state value.I should be with the inversely proportional change of U.Here RUValue the biggest, USValue closer to UCSValue, just closer to former
Constant current value；RUValue the least, USCompare UCSValue just exceed the most, the electric current of Iout is the biggest.Want to reach the spy of constant power output
Point, RUValue should increase along with the increase of output voltage Uout, reduce with the reduction of Uout.So one linear pressure of design
Control rheostat replaces RU, the IC of former constant current output just can be made to become the IC of constant power output.
It is described below and uses the circuit realiration that compensates of the present invention that constant current IC becomes the principle of invariable power IC:
R in Fig. 20With R1For divider resistance, with BG2、R2Composition emitter follower, BG1It is BG2Temperature compensator, be also simultaneously
BG2Mirroring element, by BG1Active character of changing of resistence mirror image be converted into passive rheostat, prevent IR0Nonlinear perturbations to CS.
Due to Ib2Electric current be IC2Electric current more than one percent, therefore IR0Impact on CS is negligible.Therefore the present embodiment
Can be understood as voltage-controlled device.Due to R1=R2, BG1Ub1e1=BG2Ub2e2, and R1With R0It is pure resistance, BG2Through-current capability
I.e. IC2Value depends entirely on R1With R0Ratio and the voltage U that appliedC, work as BG1、BG2、R0、R1、R2After value determines, BG2+R2
Constant-current characteristics completely with UCChange and change, UCSIt is relatively-stationary, so BG2And R2Equivalent resistance depend on the most completely
In UCValue, as long as here change UCSize just can change BG2+R2Equivalent resistance, and the most fine.Therefore, the present embodiment
Being a linear good voltage-controlled rheostat, and outfan CS to GND is passive, CS sampling voltage is little affected by IR0Shadow
Ring.This linear voltage-controlled rheostat is negative voltage characteristic, i.e. UCThe highest, its equivalent resistance is the least, therefore, is obtained by feedback coil
Output sampling voltage, it is impossible to be directly used in this voltage-controlled rheostat, the characteristic of output voltage need to be changed.Fig. 1 is to change
UCWith UC2(UC2It is the sampling voltage of output voltage) embodiment of variation characteristic: introduce a fixed voltage U hereCB(it is by three
End manostat realizes), UC=UCB-UC2.Therefore, UCChange be with UC2Increase and reduce, and be linear, because of
This UCJust can be directly used for linear voltage-controlled rheostatic running voltage double control voltage.As long as the most suitably adjusting UCBValue and R0
Value, the constant power output spy of very well (stablize) just by constant current IC in the change procedure of up to 2.6 times, can be remained
Property.Here fixed voltage UCBBeing made up of three terminal regulator, A meets C1Positive pole, for power input, B is that reference edge is (public
End altogether), it is to connect output sampling voltage C here2Negative pole rather than directly, but the U of outputCNegative pole be (GND), this
Sample, UC=UCB-UC2, it is actually formed a subtractor.Then, UCAnd between GND, just obtaining one can be by linear voltage-controlled variable resistance
The double voltage controlled of power supply that device directly uses.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Any amendment, equivalent and the improvement etc. made within god and principle, should be included within the scope of the present invention.
Claims (4)
1. become the compensation circuit that constant current IC is invariable power IC, it is characterised in that: include linear voltage-controlled rheostat, manostat；Voltage stabilizing
The power input of device meets node A, and power output end meets node C, with reference to terminated nodes B；A linear voltage-controlled rheostatic termination
Node C, other end ground connection, the 3rd terminated nodes CS, i.e. C are change in voltage input with ground, and CS exports for resistance variations with ground
End；Electrochemical capacitor C1Positive pole one terminated nodes A, other end ground connection, for compensate circuit provide electric energy；Electrochemical capacitor C2Negative pole
One terminated nodes B, other end ground connection, for obtaining the proportional sample of constant power output voltage, output voltage is sampled；Two
Pole pipe D1Negative pole one terminated nodes A, other end wiring circle f1Dynamic end；Coil f1Other end ground connection；Coil f2One end
Ground connection, another terminating diode D2Negative pole one end；Diode D2Another terminated nodes B.
The compensation circuit that change constant current IC the most according to claim 1 is invariable power IC, it is characterised in that: described the most voltage-controlled
Rheostat includes audion BG1With audion BG2, audion BG1Colelctor electrode C1With base stage b1Connect node D, emitter e simultaneously1
Connecting resistance R1One end；Audion BG2Colelctor electrode C2Connect node CS, emitter e2Connecting resistance R2One end, base stage b2Connect node
D；Resistance R0Terminated nodes C, another terminated nodes D；Resistance R1Other end ground connection；Resistance R2Other end ground connection.
The compensation circuit that change constant current IC the most according to claim 2 is invariable power IC, it is characterised in that: described audion BG1
With audion BG2For the NPN type triode of identical characteristics, it it is the low tension switch pipe of high-amplification-factor.
4.LED constant-power power source, it is characterised in that: include AC power supplies input, electric fuse F, EMC unit, bridge rectifier, permanent merit
Rate compensates circuit, constant current IC unit, transformator and DC output rectifier and filter；The input of described AC power supplies is connected with EMC unit,
It is additionally provided with electric fuse F between AC power supplies input and EMC unit；Described EMC unit connects with bridge rectifier；Bridge rectifier
Positive output terminated nodes N3；Coil f3One termination field effect transistor Q1Drain electrode, another terminated nodes N3；Field effect transistor Q1Grid
Pole connects the driving of constant current IC unit and controls end, and source electrode meets sample resistance RSOne end, sample resistance RSOther end ground connection；Resistance
RCOne end meet sample resistance RSOne end, another terminated nodes CS；Electric capacity C3Terminated nodes N3, other end ground connection；Constant current
IC unit the second end is current sampling input, connects node CS, the 3rd terminated nodes N5, the 4th end ground connection；Coil f4A termination
Diode D3One end of positive pole, another terminated nodes N2, electrochemical capacitor C4Positive pole one terminated nodes N1, electric capacity C4The other end
Meet node N2, diode D3Another terminated nodes N1；Node N1With node N2Defeated for connecting LED illumination device, i.e. invariable power
Go out end；Invariable power compensates circuit the first terminated nodes N5, the second termination coil f2One end, i.e. dynamic end, the 3rd terminated nodes
CS, the 4th end ground connection；Coil f2Other end ground connection；Coil f1Terminated nodes N5, other end ground connection.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108738203A (en) * | 2018-07-13 | 2018-11-02 | 深圳安赋特科技有限公司 | LED power invariable power input control circuit |
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| CN205946271U (en) * | 2016-08-25 | 2017-02-08 | 厦门方光电子科技有限公司 | Become compensating circuit and LED permanent power of constant current IC into permanent power IC |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108738203A (en) * | 2018-07-13 | 2018-11-02 | 深圳安赋特科技有限公司 | LED power invariable power input control circuit |
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