CN106851911A - The LED linear constant-current control circuit and LED light emission device of a kind of self adaptation clamper - Google Patents

The LED linear constant-current control circuit and LED light emission device of a kind of self adaptation clamper Download PDF

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Publication number
CN106851911A
CN106851911A CN201710089077.4A CN201710089077A CN106851911A CN 106851911 A CN106851911 A CN 106851911A CN 201710089077 A CN201710089077 A CN 201710089077A CN 106851911 A CN106851911 A CN 106851911A
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module
voltage
current
clamper
clamp
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CN106851911B (en
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李照华
陈克勇
林道明
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Shenzhen Mingwei Electronic Co Ltd
Shenzhen Sunmoon Microelectronics Co Ltd
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Shenzhen Mingwei Electronic Co Ltd
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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
    • 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]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

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Abstract

The LED linear constant-current control circuit and LED light emission device of a kind of self adaptation clamper, including：Reference voltage module, for providing reference voltage；Current output module, its input is connected with LED light group, its output end as circuit internally, for determining output current according to reference voltage；Clamp reference voltage generation module, for sampled output current and the first clamp reference voltage of generation and output current inverse correlation；Clamper module, for producing first order clamp voltage according to the first clamp reference voltage.The present invention realizes on the premise of few peripheral cell, the clamp voltage with its inverse correlation being produced according to output current, it is ensured that chip power-consumption requirement；Further, when input gauze fluctuation is larger, increased second and third grade of clamper, improve the ability for adapting to input gauze fluctuation, ensure that chip will not be damaged, control maximum current during first and second grade of clamper to ensure constant current accuracy simultaneously, solve the problems, such as security, compatibility, fabric swatch and cost.

Description

The LED linear constant-current control circuit and LED light emission device of a kind of self adaptation clamper
Technical field
The present invention relates to LED display fields, more particularly to a kind of self adaptation clamper LED linear constant-current control circuit and LED light emission device.
Background technology
At present, LED is used as a kind of new type light source, because it possess that brightness is strong, energy consumption is low and long lifespan advantage and it is extensive It is applied to every field.Because LED has fixed forward conduction voltage, when only reaching the forward conduction voltage of LED, LED Lamp could light, after LED conductings, in order to ensure that LED can work, it is necessary to the electric current to flowing through LED is carried out normal table Control, and the control method of traditional LED string is only through being connected to a number of resistance and certain amount of LED Together (as shown in Figure 1), control to flow through the electric current of LED by way of resistance current limliting, and under the conditions of mains-supplied, input Gauze fluctuation cannot be avoided, when being controlled to LED string using aforesaid way, not only it cannot be guaranteed that LED constant current, especially When gauze fluctuates upwards, the peak point current for flowing through LED can increase, and may greatly reach the rated current of LED so as to damage Bad LED, while the power that the increase of electric current also results in the resistance of series connection exceedes rated power so as to damage resistance.Extensive When system is used cooperatively, not only poor reliability, and meeting is because the damage of indivedual LED strings cause visual to whole system Difference, influence application.
In order to solve the problems of above-mentioned traditional control method of LED string, prior art proposes two kinds of solutions Certainly method.The first scheme is that have the chip of linearity constant current control circuit (such as Fig. 2 institutes by concatenating one in lamp bead string Show), constant current is controlled by chip, its operation principle is, when input voltage reaches the positive guide that chip starts voltage and LED strip During logical pressure drop sum, LED begins with electric current and flows through, and chip is started working, and system, come control electric current, reaches constant current by chip Purpose.Because the total forward conduction voltage drop of LED strip is less than input voltage peak value, input voltage peak value and the total forward direction of LED strip The difference of conduction voltage drop is applied on linear constant current control chip, and this pressure-resistant and power consumption to linear constant current control chip has very Big requirement, and in actual applications, the gauze fluctuation of input power cannot be avoided, and this just greatly tests current constant control core The pressure-resistant and power consumption of piece, and encapsulation in system applied environment to chip and peripheral components will strict requirements, this is just Although causing this scheme energy constant current, the current constant control chip power-consumption that input voltage fluctuation brings can not be solved the problems, such as, especially It is that high current and the larger gauze of scope fluctuate when applying.
Second scheme be by a number of chip with linearity constant current control circuit of being connected in lamp bead string, and The clamper tube of equal number is connected in series to chip two ends (as shown in Figure 3), is coordinated by chip internal circuits and outside clamper tube To adapt to the fluctuation of gauze, its operation principle is, in actual applications due to deviation between chip slapper, the output driving of series chip Capacity of water differs, the most weak chip of driving force, can take the lead in reaching clamp voltage, and then driving force reaches successively from weak to strong To clamper tube voltage, so as to adapt to gauze fluctuation, although can so ensure constant current output, and will not be damaged when gauze fluctuates Bad LED, but clamper tube voltage constant, in the case of different output current, in order to ensure electricity of the normal work to clamper tube Pressure and concatenation number of chips are required, and this can cause system cost high, poor compatibility, simultaneously because the limitation of applied environment, Chip and increasing for peripheral components can also increase fabric swatch difficulty.
In sum, although prior art can solve existing issue, exist security, compatibility, fabric swatch and into This problem.
The content of the invention
The technical problem to be solved in the present invention is, the above-mentioned security, compatibility and cost for prior art lack Fall into, there is provided the LED linear constant-current control circuit and LED light emission device of a kind of self adaptation clamper.
The technical solution adopted for the present invention to solve the technical problems is：A kind of LED linear constant-current control circuit is constructed, is used It is connected in LED light group, including：
Reference voltage module, for providing reference voltage；
Current output module, its input is connected with LED light group, its output end is used as LED linear constant-current control circuit Internally with next LED light group or be systematically connected, for the voltage of its input reach startup voltage when turn on, And output current is determined according to the reference voltage；
Clamp reference voltage generation module, for the output current of sampling, and generates and the output current inverse correlation The first clamp reference voltage；
Clamper module, for producing corresponding first order clamp voltage according to first clamp reference voltage.
In LED linear constant-current control circuit of the present invention, the reference voltage module also provides for the second pincers Position reference voltage, the clamper module includes：
Voltage sample module, for the voltage of the input being connected with LED of sample rate current output module；
First order clamper module, for producing the first clamp voltage according to first clamp reference voltage, when voltage is adopted Start the first order clamper when voltage of egf block sampling is more than the first clamp voltage to work so that what voltage sample module samples were arrived Voltage clamping does not work otherwise within first clamp voltage；
Second level clamper module, for producing corresponding second clamp voltage according to second clamp reference voltage, when Start clamper work in the second level when voltage that voltage sample module samples are arrived is more than the second clamp voltage so that voltage sample module The voltage clamping of sampling does not work otherwise within second clamp voltage；
Clamp current control module, for controlling the first order clamper module and second level clamper module to be worked in clamper When maximum current ensuring constant current accuracy.
In LED linear constant-current control circuit of the present invention, the reference voltage module also provides for the 3rd pincers Position reference voltage, the clamper module also includes：
Third level clamper module, for producing corresponding 3rd clamp voltage according to the 3rd clamp reference voltage, when Start the work of the third level clamper when voltage that voltage sample module samples are arrived is more than three clamp voltages so that voltage sample module The voltage clamping of sampling does not work otherwise within the 3rd clamp voltage, and regulation and control and electricity when third level clamper works The electric current of the LED light group of stream output module connection.
In LED linear constant-current control circuit of the present invention, the current output module includes output current control Module and output current control resistance, wherein, the output current control module includes the first operational amplifier, a N-channel The first metal-oxide-semiconductor and the second metal-oxide-semiconductor, first resistor, the in-phase input end of the first operational amplifier and the reference voltage module To receive the reference voltage, out-phase input is connected to obtain the electric current of its output, out-phase with third level clamper module for connection Input also connects the source electrode of the first metal-oxide-semiconductor and the second metal-oxide-semiconductor, the output end connection of the first operational amplifier via first resistor The grid of the grid of the first metal-oxide-semiconductor and the second metal-oxide-semiconductor, the first metal-oxide-semiconductor and the second metal-oxide-semiconductor link together after with clamp current control Molding block is connected, and the source electrode of the first metal-oxide-semiconductor and the second metal-oxide-semiconductor connects after being connected together with one end of output current control resistance Connect, output current control resistance the other end as it is described internally, the drain electrode of the first metal-oxide-semiconductor is used as the defeated of current output module Enter end, the drain electrode of the second metal-oxide-semiconductor is connected with the clamp reference voltage generation module.
In LED linear constant-current control circuit of the present invention, the voltage sample module includes the first sampling resistor With the second sampling resistor, the first order clamper module includes the 3rd metal-oxide-semiconductor of the second operational amplifier and N-channel, described the Two grades of clamper modules include the 4th metal-oxide-semiconductor of the 3rd operational amplifier and N-channel, and the third level clamper module includes the 4th fortune Calculate the 5th metal-oxide-semiconductor of amplifier and N-channel, the clamp current control module includes the 5th operational amplifier and N-channel 6th metal-oxide-semiconductor and the 7th metal-oxide-semiconductor；
First sampling resistor and the second sampling resistor be serially connected in the input of current output module and internally between, The connecting node of first sampling resistor and the second sampling resistor is respectively connecting to the second operational amplifier, the 3rd computing simultaneously The in-phase input end of amplifier, four-operational amplifier, out-phase input and the clamp reference voltage of the second operational amplifier are produced Raw module connects to receive first clamp reference voltage, out-phase input and the reference voltage module of the 3rd operational amplifier Connection to receive second clamp reference voltage, the out-phase input of four-operational amplifier be connected with reference voltage module with The 3rd clamp reference voltage is received, the 3rd metal-oxide-semiconductor, the drain electrode of the 4th metal-oxide-semiconductor are connected to the input of current output module End, the grid of the 3rd metal-oxide-semiconductor is connected to the drain electrode that the output end of the second operational amplifier, source electrode are connected to the 6th metal-oxide-semiconductor, the 4th The grid of metal-oxide-semiconductor is connected to the drain electrode that the output end of the 3rd operational amplifier, source electrode are connected to the 7th metal-oxide-semiconductor, the 6th metal-oxide-semiconductor and The grid of the 7th metal-oxide-semiconductor is connected after linking together with the first metal-oxide-semiconductor and the grid of the second metal-oxide-semiconductor in current output module, The source electrode of the 6th metal-oxide-semiconductor and the 7th metal-oxide-semiconductor is connected after linking together with the output end of the 5th operational amplifier, and the 5th computing is put The in-phase input end of big device connects the reference voltage module and is connected with receiving the reference voltage, out-phase input and output end Connect, the grid of the 5th metal-oxide-semiconductor be connected to the output end of four-operational amplifier, source electrode be connected to internally, drain electrode connection electric current The out-phase input of the first operational amplifier in output module.
In LED linear constant-current control circuit of the present invention, the clamp reference voltage generation module includes：
Output current sampling module, input connects the current output module, for obtaining the output current and producing Raw one and the proportional sample rate current of output current；
First clamp reference voltage generation module, input connects the output end of the output current sampling module, output End connection first order clamper module, for the sample rate current to be converted into corresponding voltage as first clamp reference Voltage.
In LED linear constant-current control circuit of the present invention, the first clamp reference voltage generation module includes Multiplier, the output current sampling module includes two current mirrors, and the input connection electric current of first current mirror is defeated Go out module, output end and connect second input of current mirror, second output end of current mirror connects the input of multiplier, The output end connection first order clamper module of multiplier.
The invention also discloses a kind of LED light emission device, including：For the rectification input module, N number of electrically connected with city LED light group and N number of described LED linear constant-current control circuit, N number of LED light group and N number of LED linear constant-current control circuit It is serially connected between the positive output end of rectification input module and negative output terminal, and LED light group and LED linear constant-current control circuit interval Arrangement.
Implement the LED linear constant-current control circuit and LED light emission device of self adaptation clamper of the invention, have with following Beneficial effect：The present invention is realized on the premise of few peripheral cell, according to the output current of sampling, is produced and its inverse correlation Clamp voltage, when output current is small, correspondingly sets big clamped voltage value, when output current is big, accordingly Ground sets small clamped voltage value, it is ensured that chip power-consumption meets requirement；Further, when input gauze fluctuation is larger, The second level, third level clamper are increased, so as to improve the ability that system adapts to input gauze fluctuation, it is ensured that chip will not be damaged It is bad, while built-in clamp current control module, controls the first order clamper module and second level clamper module to be worked in clamper When maximum current to ensure constant current accuracy, realize solving security, compatibility, fabric swatch and cost while constant current output Problem.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this Inventive embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis The accompanying drawing of offer obtains other accompanying drawings：
Fig. 1 is the structural representation of the first traditional LED linear constant-current control circuit；
Fig. 2 is second structural representation of traditional LED linear constant-current control circuit；
Fig. 3 is the structural representation of the third traditional LED linear constant-current control circuit；
Fig. 4 is the structural representation of the LED light emission device of present pre-ferred embodiments；
Fig. 5 is the electrical block diagram of the current output module in Fig. 4；
Fig. 6 is the electrical block diagram of the clamp reference voltage generation module in Fig. 4；
Fig. 7 is the electrical block diagram of the clamper module in Fig. 4.
Specific embodiment
The LED linear constant-current control circuit of self adaptation clamper of the invention includes：Reference voltage module, for providing benchmark Voltage；Current output module, its input is connected with LED light group, its output end as LED linear constant-current control circuit inside Ground and next LED light group or be systematically connected, for being turned on when the voltage of its input reaches startup voltage, and root Determine output current according to the reference voltage；Clamp reference voltage generation module, for the output current of sampling, and generate with First clamp reference voltage of the output current inverse correlation；Clamper module, for being produced according to first clamp reference voltage The corresponding first order clamp voltage of life.
In order to be better understood from above-mentioned technical proposal, below in conjunction with Figure of description and specific embodiment to upper State technical scheme to be described in detail, it should be understood that the specific features in the embodiment of the present invention and embodiment are to the application The detailed description of technical scheme, rather than the restriction to technical scheme, in the case where not conflicting, the present invention is implemented Technical characteristic in example and embodiment can be mutually combined.
With reference to Fig. 4, LED light emission device includes：For electrically connected with city rectification input module 100, n LED light group with And n LED linear constant-current control circuit, n LED light group and n LED linear constant-current control circuit are serially connected in rectification input mould Between the positive output end and negative output terminal of block, and LED light group and LED linear constant-current control circuit are spaced.Rectification is input into mould The negative output terminal of block 100 is used as systematically.N LED light group is the LED light group 200 in figure1~200n, n LED linear constant current control Circuit processed is 300 in figure1~300n, rectification input module 100 is LED light group 2001~200nWith LED linear current constant control electricity Road 3001~300nThe rectification input module 100 of input voltage is provided, n is the positive integer more than or equal to 1.Wherein, each LED LED numbers in group be able to can not also be waited with equal.
With the LED linear constant-current control circuit 300 in Fig. 4nAs a example by, LED linear constant-current control circuit 300nIncluding：
Reference voltage module 310n, for providing reference voltage V ref, the second clamp reference voltage VZ2, the 3rd clamper ginseng Examine voltage VZ3；
Current output module 340n, its input is connected with LED light group, its output end is used as LED linear current constant control electricity Road 300nInternally with next LED light group or be systematically connected, for the voltage of its input reach startup electricity Turned on during pressure, and output current is determined according to the reference voltage V ref；
Clamp reference voltage generation module 320n, for the output current of sampling, and generate anti-with the output current The first related clamp reference voltage VZ1；
Clamper module 330n, including voltage sample module 335n, first order clamper module 331n, second level clamper module 332n, third level clamper module 333n, clamp current control module 334n, wherein：
Voltage sample module 335n, for sample rate current output module 340nInput voltage OUTn, it is noted that herein Voltage OUTnRefer to relative LED linear constant-current control circuit 300nVoltage internally, rather than systematically；
First order clamper module 331n, for producing the first clamp voltage Z1 according to the first clamp reference voltage VZ1, As the voltage OUT of voltage sample module samplesnStart the work of the first order clamper during more than the first clamp voltage Z1 so that voltage is adopted The voltage OUT that egf block is samplednClamper does not work otherwise within the first clamp voltage Z1；
Second level clamper module 332n, for producing corresponding second clamper according to the second clamp reference voltage VZ2 Voltage Z2, as the voltage OUT that voltage sample module samples are arrivednDuring more than the second clamp voltage Z2 start the second level clamper work with Make the voltage OUT of voltage sample module samplesnClamper does not work otherwise within the second clamp voltage Z2；
Third level clamper module 333n, for producing corresponding 3rd clamper according to the 3rd clamp reference voltage VZ3 Voltage Z3, as the voltage OUT that voltage sample module samples are arrivednStart during more than the 3rd clamp voltage Z3 the work of third level clamper with Make the voltage OUT of voltage sample module samplesnClamper does not work otherwise within the 3rd clamp voltage Z3, and the 3rd The electric current of the LED light group that regulation and control are connected with current output module when level clamper works；
Clamp current control module 334n, for controlling the first order clamper module 331nWith second level clamper module 332nMaximum current when clamper works is ensuring constant current accuracy.
Wherein, each reference voltage module 310nThe numerical value of interior Vref, VZ1, VZ2 is fixed；First clamp voltage The size and output current of Z1 have direct relation；What the size of the second clamp voltage Z2 was to determine, and output current is unrelated；The The size of three clamp voltage Z3 is relevant with input voltage peak value.
With continued reference to Fig. 4, with reference to Fig. 5, current output module 340nIncluding output current control module CTRnAnd output current Control resistance Re, wherein, the output current control module CTRnIncluding a first operational amplifier OP, N-channel first Metal-oxide-semiconductor M01 and the second metal-oxide-semiconductor M02, first resistor R1.
Specifically, the in-phase input end of operational amplifier OP and reference voltage module 310nConnection is electric to receive the benchmark Pressure Vref, out-phase input and third level clamper module 333nConnect to obtain the electric current Icon of its output, out-phase input is also Via the source electrode of resistance R1 connection metal-oxide-semiconductors M01 and M02, the grid of output end connection the metal-oxide-semiconductor M01 and M02 of operational amplifier OP Pole, the grid of metal-oxide-semiconductor M01 and M02 link together after with clamp current control module 334nConnection, metal-oxide-semiconductor M01's and M02 Source electrode is connected after being connected together with one end of resistance Re, and the other end of resistance Re is used as current output module 340nOutput end, Namely LED linear constant-current control circuit is internally, the drain electrode of metal-oxide-semiconductor M01 is used as current output module 340nInput, use In the output end of connection lamp group, its voltage is expressed as OUTn, drain electrode and the clamp reference voltage generation module 320 of metal-oxide-semiconductor M02n Connect to export sample rate current I_sample.
With continued reference to Fig. 4, with reference to Fig. 6, clamp reference voltage generation module 320nIncluding：
Output current sampling module 321n, input connection current output module 340n, for obtaining the output current I_ Sample, then processes output one and output current I_sample proportional sample rate current I3 by current mirror；
First clamp reference voltage generation module 322n, input connection output current sampling module 321nOutput end, it is defeated Go out end and connect first order clamper module 331n, for the sample rate current I_sample to be converted into corresponding voltage as One clamp reference voltage VZ1.
With reference to Fig. 6, the first clamp reference voltage generation module 322nIncluding multiplier, output current sampling module 321nBag Include current mirror 4 and current mirror 5, the input connection output current control module CTR of current mirror 5nThe drain electrode of interior metal-oxide-semiconductor M02, Output end connects the input of current mirror 4, and the output end of current mirror 4 connects the input of multiplier, and the output end of multiplier connects Connect first order clamper module 331nTo export the first clamp reference voltage VZ1.Wherein, the concrete structure of multiplier is not limited System, as long as corresponding voltage can be converted electrical current into.
Assuming that the strict matching of NPN pipes in circuit in Fig. 6, with identical gain beta and sufficiently large, so that can neglect Slightly base current influence, the characteristic (concrete operating principle of multiplier is no longer described) according to multiplier, have below equation into It is vertical：
I1*I2=I3*I4
Wherein I1And I2Relation is mirrored into, while be also bias current, it can be assumed that to immobilize, I3It is defeated equal to sampling Go out electric current I_sample, so as to there is below equation to set up：
Circuit in Fig. 6 has below equation to set up again：
VZ1=I5*R2
Wherein I4And I5It is mirrored into relation, it is assumed that K*I4=I5, there is below equation to set up again：
K, R2, I1, I2Be the value of the determination of multiplier, it is hereby achieved that one with output current into fixed relationship Voltage VZ1.
With continued reference to Fig. 4, with reference to Fig. 7, voltage sample module 335nIncluding sampling resistor Ra, Rb, first order clamper module 331nMetal-oxide-semiconductor M1 including operational amplifier OP1 and N-channel, the second level clamper module 332nIncluding operational amplifier OP2 With the metal-oxide-semiconductor M2 of N-channel, the third level clamper module 333nMetal-oxide-semiconductor M3 including operational amplifier OP3 and N-channel, it is described Clamp current control module 334nMetal-oxide-semiconductor M4, M5 including operational amplifier OP4 and N-channel.
Sampling resistor Ra, Rb are serially connected in current output module 340nInput and internally between, that is, be serially connected in one Between individual LED light group and next LED light group, or for last LED light group, LED light group and system are serially connected in Between ground, the connecting node of sampling resistor Ra, Rb is respectively connecting to the homophase input of operational amplifier OP1, OP2, OP3 simultaneously End, out-phase input and the clamp reference voltage generation module 320 of OP1nConnect to receive first clamp reference voltage The out-phase input of VZ1, OP2 and reference voltage module 310nConnect to receive the second clamp reference voltage VZ2, OP3's Out-phase input and reference voltage module 310nConnect to receive the 3rd clamp reference voltage VZ3, the leakage of metal-oxide-semiconductor M1, M2 Pole is connected to current output module 340nInput, i.e. the output end of lamp group n, the grid of metal-oxide-semiconductor M1 is connected to the defeated of OP1 Go out the drain electrode that end, source electrode are connected to metal-oxide-semiconductor M4, the grid of metal-oxide-semiconductor M2 is connected to the output end of OP2, source electrode and is connected to metal-oxide-semiconductor M5 Drain electrode, the grid of metal-oxide-semiconductor M4, M5 link together after with current output module 340nThe grid of interior metal-oxide-semiconductor M01, M02 connects Connect, the source electrode of metal-oxide-semiconductor M4, M5 is connected after linking together with the output end of OP4, the in-phase input end of OP4 connects the benchmark Voltage module 310nIt is connected with output end with receiving the reference voltage V ref, out-phase input, the grid of metal-oxide-semiconductor M3 is connected to The output end of OP3, source electrode be connected to internally, drain electrode connection current output module 340nOP1 out-phase input.
With reference to the embodiment of the present invention, to elaborate operation principle of the invention.
As with reference to shown in Fig. 4, n LED light group and n LED linear constant-current control circuit, connected mode use series connection Method, LED light group 2001With LED linear constant-current control circuit 3001Correspondence, LED light group 2002With LED linear constant-current control circuit 3002Correspondence, by that analogy, LED light group 200nWith LED linear constant-current control circuit 300nCorrespondence.
In actual applications, LED linear constant-current control circuit 3001~300nInner parameter can inevitably occur partially Difference, so LED linear constant-current control circuit 3001~300nIn reference voltage module 3101~310nOutput Vref1~ VrefnIt is inevitable not of uniform size, it is assumed that Vref1~VrefnMagnitude relationship it is as follows：
Vref1＜ Vref3＜ Vref3... ＜ Vrefn-1＜ Vrefn
Vref1~VrefnThe output current Iout determined jointly with resistance Re1~IoutnDifference in size is certainly existed, it is false Determine LED linear constant-current control circuit 3001Output current Iout1It is as follows：
LED linear constant-current control circuit 3002Output current Iout2It is as follows：
The rest may be inferred, LED linear constant-current control circuit 300nOutput current IoutnIt is as follows：
LED linear constant-current control circuit 300 can also be drawn according to above-mentioned hypothesis1~300nOutput current Iout1~ IoutnRelation it is as follows：
Iout1＜ Iout2＜ Iout3... ＜ Ioutn-1＜ Ioutn
In rectifier bridge BD incoming transports electricity AC, input voltage begins to ramp up from 0V, when input voltage reaches all LEDs Group 2001~200nForward conduction voltage and series connection all LED linear constant-current control circuits 3001~300nStartup electricity Pressure Vs1~VsnWhen, for output current control module CTR1, by the reference voltage Vref that the in-phase input end of OP is input into1Greatly In the voltage of its out-phase input, so the output end output high level of OP drives M1And M2 conductings, now in all LED light groups All LED light, the source voltage of M01 and M02 and reference voltage V ref1Equal, then resistance Re is connected with M01 and M02 The voltage swing of one end also on the basis of voltage Vref1, the pressure drop in the voltage difference and resistance Re of the drain-to-source of M01 is LED linear constant-current control circuit 3001Startup voltage Vs1, therefore, all LED light groups conducting electric current I now such as following formula institutes Show：
With according to hypothesis Vref1＜ Vref2＜ Vref3... ＜ Vrefn-1＜ Vrefn, for all LED linears of tandem-type connection The electric current of constant-current control circuit is Iout1, due to output current control module CTR2The in-phase input end institute of the OP in circuit is defeated The reference voltage Vref for entering2More than the voltage Vref of its out-phase input1, wherein Vref1=Iout1* Re, so CTR2In M01 and M02 is turned on, but now M01 and M02 are operated in linear zone, in the voltage difference and resistance Re of the drain-to-source of M01 Pressure drop is LED linear constant-current control circuit 3002Startup voltage Vs2.By that analogy, CTR3~CTRnIn M01 and M02 it is equal Linear zone is operated in, the pressure drop in the voltage difference and resistance Re of M01 and M02 drain-to-sources is LED linear current constant control Circuit 3003To LED linear constant-current control circuit 300nStartup voltage Vs3~Vsn。
Simultaneously for all LED linear constant-current control circuits 3001~300nFor, its internal clamper module 330nEqual work Make in non-clamping state, 3001~300nClamp reference voltage generation module 3201~320nProduce identical and with Iout1 First clamp reference voltage VZ1 of size inverse correlation, so that 3001~300nClamp voltage be all set to Z1, now CTR1 ~CTRnThe input being connected with LED light group voltage OUT1~OUTnIt is the startup voltage of LED linear constant-current control circuit Vs1~Vsn。
With reference to Fig. 7, OUT1~OUTnCorrespond to Vs1~Vsn, as can be seen from the figure operational amplifier OP1, operational amplifier The in-phase input end of OP2 and operational amplifier OP3 is：
Now VZ11>VO1, VZ12>VO2, by that analogy, VZ1n>VOn.So first order clamper module 3311~331nIn M11~M1nIt is turned off, first order clamper does not work, in order to subsequently understand, needs exist for, it is emphasized that M41~M4nAnd computing is put Big device OP41~OP4nFunction be to determine first order clamper module 3311~331nIn M11~M1nThe maximum electricity for flowing through Stream IM11_max~IM1n_max, in circuit, Iout1~IoutnDeviation in practice is set to less than maximum current IM11_max~IM1n_max, circuit design IM11_max+Iout1＞ Ioutn.For clamp current control module 3341~334nIn M51~M5nAnd OP51~OP5n, their function is to limit second level clamper mould 3321~332nIn M21~M2nFlow through Maximum current IM21_max~IM2n_max, in circuit, Iout1~IoutnDeviation be set to less than maximum current IM21_max~IM2n_max, circuit design IM21_max+Iout1＞ Ioutn, while that subsequently mentions flows through M11~M1nElectric current it is equal It is less than or equal to IM11_max~IM1n_max, flow through M21~M2nElectric current be less than or equal to IM21_max~ IM2n_max；
With the rising of input voltage, output current control module CTR1With LED light group 2001The electricity of the input of connection Pressure OUT1Will rise until Z1, now VZ11=VO1, VZ12>VO2, VZ13>VO3, by that analogy, VZ1n>VOn.So first Level clamper module 3311Start the work of first order clamper, M1 therein1Open, the electric current for then flowing through LED light group is equal to Iout1 Plus flowing through M11Electric current IM11, work as Iout1+IM11=Iout2When, output current control module CTR2Voltage OUT2Will Rise, now LED linear constant-current control circuit 3001First order clamper is operated in, the electric current for then flowing through LED light group is equal to Iout2；
With the rising of input voltage, output current control module CTR2With LED light group 2002The voltage of the input of connection OUT2Will rise until Z1, now VZ11=VO1, VZ12=VO2, VZ13>VO3, by that analogy, VZ1n>VOn.So the first order Clamper module 3312In M12Open, the electric current for then flowing through LED light group is equal to Iout2Plus flowing through M12Electric current IM12, when Iout2+IM12=Iout3When, output current control module CTR3Voltage OUT3Will rise, now LED linear current constant control Circuit 3001~3002First order clamper is operated in, the electric current for then flowing through LED light group is equal to Iout3；
By that analogy, with the rising of input voltage, output current control module CTRn-1With LED light group 200n-1Connection Input voltage OUTn-1Will rise until Z1, LED linear constant-current control circuit 300n-1First order clamper is reached, now VZ11=VO1, VZ12=VO2, VZ13=VO3, by that analogy, VZ1n-1=VOn-1, VZ1n>VOn.So LED linear current constant control Circuit 300n-1Clamper module 330n-1First order clamper module 331n-1In M1n-1Open, then flow through the electricity of LED light group Stream is equal to Ioutn-1Plus flowing through LED linear constant-current control circuit 300n-1Clamper module 330n-1First order clamper module 331n-1In M1n-1Electric current IM1n-1, work as Ioutn-1+IM1n-1=IoutnWhen, LED linear constant-current control circuit 300nOutput electricity Flow control module CTRnInput terminal voltage OUTnWill rise, now LED linear constant-current control circuit 3001~300n-1Work In first order clamper, the electric current for then flowing through LED light group is equal to Ioutn；
With the rising of input voltage, output current control module CTRnInput terminal voltage OUTnWill rise until Z1, LED linear constant-current control circuit 300nFirst order clamper is reached, now VZ11=VO1, VZ12=VO2, VZ13=VO3, with such Push away, VZ1n=VOn.So first order clamper module 331nIn M1nOpen, the electric current for then flowing through LED light group is equal to IoutnPlus Upper first order clamper module 331nIn M1nElectric current IM1n, work as Ioutn+IM1n=Iout1+IM11_maxWhen, output current control mould Block CTR1Voltage OUT1Will be from voltage Z1On the basis of rise, now LED linear constant-current control circuit 3001~300nWork In first order clamper, the electric current for then flowing through LED light group is equal to (Ioutn+IM1n), while being also equal to (Iout1+IM11_max)；
More than, all LED linear constant-current control circuits 3001~300nFirst order clamper is operated in, if be now input into Voltage continues to rise, output current control module CTR1Input terminal voltage OUT1Will rise until Z2, while clamper module 3301In second level clamp circuit 3321Start working.
With reference also to Fig. 7, as can be seen from the figure operational amplifier OP1, operational amplifier OP2 and operational amplifier OP3 In-phase input end be：
Now VZ21=VO1, VZ22>VO2, by that analogy, VZ2n>VOn.So first order clamper module 3311~331nIn M11~M1nOpen, clamper module 3301In second level clamper module 3321In M21Open, clamper module 3302~ 330nSecond level clamper module 3322~332nIn M22~M2nClose, now LED linear constant-current control circuit 3002~ 300nIt is operated in first order clamper, LED linear constant-current control circuit 3001Second level clamper is operated in, LED light group is then flowed through Electric current be equal to Iout1+IM11_maxPlus flowing through clamper module 3301Second level clamper module 3321In M21Electric current IM21, Work as Iout1+IM11_max+IM21=Iout2+IM12_maxWhen, output current control module CTR2Input terminal voltage OUT2Will be Z1On the basis of rise, the electric current for then flowing through LED light group is equal to
With the rising of input voltage, output current control module CTR2Input terminal voltage OUT2Will rise until Z2, LED linear constant-current control circuit 3002Second level clamper is reached, now VZ21=VO1, VZ22=VO2, VZ23>VO3, with such Push away, VZ2n>VOn.So clamper module 3301~330nFirst order clamper module 3311~331nIn M11~M1nOpen, Clamper module 3302In second level clamper module 3322In M22Open, clamper module 3303~330nSecond level clamper mould Block 3323~332nIn M23~M2nClose, now LED linear constant-current control circuit 3003~300nIt is operated in first order pincers Position, LED linear constant-current control circuit 3001~3002Second level clamper is operated in, the electric current for then flowing through LED light group is equal to Iout2+IM12_maxPlus flowing through clamper module 3302Second level clamper module 3322In M22Electric current IM22, work as Iout2+ IM12_max+IM22=Iout3+IM13_maxWhen, LED linear constant-current control circuit 3003Output current control module CTR3It is defeated Enter terminal voltage OUT3Will be in first order clamp voltage Z1On the basis of rise, the electric current for then flowing through LED light group is equal to
By that analogy, with the rising of input voltage, LED linear constant-current control circuit 300n-1Output current control mould Block CTRn-1Input terminal voltage OUTn-1Will rise until Z2, LED linear constant-current control circuit 300n-1Reach second level pincers Position, now VZ21=VO1, VZ22=VO2, VZ23=VO3, by that analogy, VZ2n-1=VOn-1, VZ2n>VOn.So all clampers Module 3301~330nFirst order clamper module 3311~331nIn M11~M1nOpen, clamper module 330n-1In Two grades of clamper modules 332n-1In M2n-1Open, clamper module 330nSecond level clamper module 332nIn M2nClose, now LED linear constant-current control circuit 300nIt is operated in first order clamper, LED linear constant-current control circuit 3001~300n-1It is operated in Two grades of clampers, the electric current for then flowing through LED light group is equal to (Ioutn-1+IM1n-1_max) add and flow through clamper module 330n-1 Two grades of clamper modules 332n-1In M2n-1Electric current IM2n-1, work as Ioutn-1+IM1n-1_max+IM2n-1=Ioutn+IM1n_maxWhen, LED linear constant-current control circuit 300nOutput current control module CTRnInput terminal voltage OUTnWill be in first order clamper Voltage Z1On the basis of rise, then flow through LED light group electric current be equal to (Ioutn+IM1n_max)；
With the rising of input voltage, output current control module CTRnInput terminal voltage OUTnWill rise until Z2, LED linear constant-current control circuit 300nSecond level clamper is reached, at this point for VZ21=VO1, VZ22=VO2, VZ23=VO3, with This analogizes, VZ2n=VOn.Clamper module 330nSecond level clamper module 332nIn M2nOpen, then flow through LED light group Electric current is equal to (Ioutn+IM1n_max) add and flow through LED linear constant-current control circuit 300nClamper module 330nThe second level pincers Position module 332nIn M2nElectric current IM2n, work as Ioutn+IM1n_max+IM2n=Iout1+IM11_max+IM21_maxWhen, LED linear is permanent Flow control circuit 3001Output current control module CTR1Input terminal voltage OUT1Will be from second level clamp voltage Z2Base Plinth rises, now LED linear constant-current control circuit 3001~300nSecond level clamper is operated in, the electric current of LED light group is then flowed through It is equal to(Iout is also waited simultaneously1+IM11_max+IM21_max)；
With reference to in-phase input end and out-phase input terminal voltage phase during operational amplifier OP normal works in Fig. 5 and Fig. 7, Fig. 5 Deng if no electric current flows through R1, then the first end of R1 and second terminal voltage of R1 are equal, i.e. the first end and fortune of resistance Re The out-phase input terminal voltage for calculating amplifier OP is equal, if electric current Icon flows through the first end of R1 from second end of R1, then R1 The second end to R1 first end potential be positive potential, potential size be (Icon*R1), due in the normal works of operational amplifier OP In-phase input end and out-phase input terminal voltage are equal when making, then the potential of the first end of Re to ground is positive potential, potential size It is (Icon*R1+ Vref), then output current is：
More than, all LED linear constant-current control circuits 3001~300nSecond level clamper is operated in, if be now input into Voltage continues to rise, the output current control module CTR1Input terminal voltage OUT1Will rise until Z3, simultaneously for LED linear constant-current control circuit 3001Clamper module 3301Third level clamper 3321Start working.
With reference to Fig. 7, as can be seen from the figure operational amplifier OP1, operational amplifier OP2 and operational amplifier OP3's is same Phase input is：
Now VZ31=VO1, VZ32>VO2, by that analogy, VZ3n>VOn.So all clamper modules 3301~330n One-level clamper module 3311~331nIn M11~M1nOpen, second level clamper module 3321~332nMiddle M21~M2nOpen Open, clamper module 3301In third level clamp circuit 3331In M31Open, clamper module 3302~330nThird level clamper 3322~332nIn M32~M3nClose, now LED linear constant-current control circuit 3002~300nSecond level clamper is operated in, LED linear constant-current control circuit 3001It is operated in third level clamper, clamper module 3301Third level clamper module 3331In M31Electric current is Icon1, the electric current for then flowing through LED light group is equal to When When, LED linear constant-current control circuit 3002Output current control module CTR2Input terminal voltage OUT2Will be in second level clamper Voltage Z2On the basis of rise, then flow through LED light group electric current be equal to (Iout2+IM12_max+IM22_max)；
With the rising of input voltage, output current control module CTR2Input terminal voltage OUT2Will rise until Z3, LED linear constant-current control circuit 3002Third level clamper is reached, now VZ31=VO1, VZ32=VO2, VZ33>VO3, with such Push away, VZ3n>VOn.Clamper module 3301~330nFirst order clamper module 3311~331nIn M11~M1nOpen, second Level clamper module 3321~332nMiddle M21~M2nOpen, clamper module 3301In third level clamp circuit 3332In M32 Open, clamper module 3303~330nThird level clamper 3323~332nIn M33~M3nClose, now LED linear constant current control Circuit processed 3003~300nIt is operated in second level clamper, LED linear constant-current control circuit 3001~3002It is operated in third level pincers Position, LED linear constant-current control circuit 3002Clamper module 3302Third level clamper 3322In M32Electric current is Icon2, now The electric current for flowing through LED light group is equal toWhen When, output current control module CTR3Input terminal voltage OUT3Will be in second level clamp voltage Z2On the basis of rise, the electric current for then flowing through LED light group is equal to (Iout3+IM13_max+IM23_max)；
By that analogy, with the rising of input voltage, output current control module CTRn-1Input terminal voltage OUTn-1Will Can rise until Z3, LED linear constant-current control circuit 300n-1Third level clamper is reached, now VZ31=VO1, VZ32=VO2, with This analogizes, VZ3n-1=VOn-1, VZ3n>VOn.Clamper module 3301~330nFirst order clamper module 3311~331nIn M11 ~M1nOpen, second level clamper module 3321~332nMiddle M21~M2nOpen, clamper module 330n-1In the third level pincers Position circuit 333n-1In M3n-1Open, clamper module 330nThird level clamper 332nIn M3nClose, now LED linear is permanent Flow control circuit 300nIt is operated in second level clamper, LED linear constant-current control circuit 3001~300n-1Third level clamper is operated in, Clamper module 330n-1Third level clamper 332n-1In M3n-1Electric current is Iconn-1, the electric current for then flowing through LED light group is equal to When When, output current control Module CTRnInput terminal voltage OUTnWill be in Z2On the basis of rise, then flow through LED light group electric current be equal to (Ioutn+ IM1n_max+IM2n_max)；
With the rising of input voltage, output current control module CTRnInput terminal voltage OUTnWill rise until Z3, LED linear constant-current control circuit 300nThird level clamper is reached, now VZ31=VO1, VZ32=VO2, by that analogy, VZ3n-1= VOn-1, VZ3n=VOn.LED linear constant-current control circuit 3001~300nBe operated in third level clamper, if input voltage after It is continuous to rise, clamper module 330nThird level clamp circuit 333nIn M3nWill open, will now have electric current and flow through M3n。 If now input voltage continues to go up, it will to LED linear constant-current control circuit 3001~300nPressure-resistant, power consumption and perseverance Stream precision will all propose acid test.In LED linear constant-current control circuit 3001~300nJust it is operated in third level clamper When, input voltage now is equal to n*Z3Plus the cut-in voltage of all LED light groups, enough big of this input voltage value, Sufficiently achieve the gauze fluctuation in practical application.So the LED linear constant-current control circuit 300 that application proposal is concatenated1~300n Clamper no more than third level clamper, and then flow through the electric current of LED light group and be equal to (Ioutn+IM1n_max+IM2n_max) The requirement of constant current accuracy can be met.
In sum, in actual applications, different input voltage fluctuation area requirements are tackled, can be connected by increasing and decreasing The number of LED linear constant-current control circuit 300 adapt to different demands.In order to better meet reliability, described in each The maximum clamp voltage of LED linear constant-current control circuit is no more than third level clamp voltage Z3.Extreme case also can only be institute The LED linear constant-current control circuit for having series connection is operated in third level clamper, i.e., in application process, in order to ensure constant current accuracy And reliability, the peak-peak VP of input voltage fluctuation should be less than or equal to (n*Z3) and all LED light groups forward conduction pressure Drop sum, wherein n is the number of the LED linear constant-current control circuit 300 of series connection in system application.If the LED of all series connection The clamp voltage that linearity constant current control circuit has one of LED linear constant-current control circuit in input voltage peak value is less than Z3, then the clamp voltage of other any one LED linear constant-current control circuits is not over Z3.Therefore the present invention is realized On the premise of few peripheral cell, it is ensured that high-precision constant current output, avoid lamp bead and wafer damage, drastically increase System to the adaptability of gauze fluctuation, is damaged so as to solve when prior art lamp bead nets fluctuation online in actual applications Phenomenon.
Word " equal ", " identical " " while " or other similar terms, be not limited to absolute equal in mathematical term Or it is identical, can be close on engineering significance or in acceptable error range when right described in this patent is implemented.
" connected " or " connection ", not only including two entities are joined directly together, also including changing by with beneficial Other entities of kind effect are indirectly connected to.
Embodiments of the invention are described above in conjunction with accompanying drawing, but the invention is not limited in above-mentioned specific Implementation method, above-mentioned specific embodiment is only schematical, rather than restricted, one of ordinary skill in the art Under enlightenment of the invention, in the case of present inventive concept and scope of the claimed protection is not departed from, can also make a lot Form, these are belonged within protection of the invention.

Claims (8)

1. a kind of LED linear constant-current control circuit of self adaptation clamper, for being connected with LED light group, it is characterised in that including：
Reference voltage module, for providing reference voltage；
Current output module, its input with LED light group for being connected, its output end is used as LED linear constant-current control circuit Internally, turned on when the voltage in its input reaches startup voltage, and output current is determined according to the reference voltage；
Clamp reference voltage generation module, for the output current of sampling, and generate with the output current inverse correlation the One clamp reference voltage；
Clamper module, for producing corresponding first order clamp voltage according to first clamp reference voltage.
2. LED linear constant-current control circuit according to claim 1, it is characterised in that the reference voltage module is also used In the second clamp reference voltage is provided, the clamper module includes：
Voltage sample module, for the voltage of the input being connected with LED of sample rate current output module；
First order clamper module, for producing the first clamp voltage according to first clamp reference voltage, when voltage sample mould Start the first order clamper when voltage of block sampling is more than the first clamp voltage to work so that the voltage clamp of voltage sample module samples Position does not work otherwise within first clamp voltage；
Second level clamper module, for producing corresponding second clamp voltage according to second clamp reference voltage, works as voltage Start the second level clamper when voltage of sampling module sampling is more than the second clamp voltage to work so that voltage sample module samples Voltage clamping does not work otherwise within second clamp voltage；
Clamp current control module, for controlling the first order clamper module and second level clamper module when clamper works Maximum current is ensuring constant current accuracy.
3. LED linear constant-current control circuit according to claim 2, it is characterised in that the reference voltage module is also used In the 3rd clamp reference voltage is provided, the clamper module also includes：
Third level clamper module, for producing corresponding 3rd clamp voltage according to the 3rd clamp reference voltage, works as voltage Start the third level clamper when voltage of sampling module sampling is more than three clamp voltages to work so that voltage sample module samples Voltage clamping does not work otherwise within the 3rd clamp voltage, and regulation and control and electric current output when third level clamper works The electric current of the LED light group of module connection.
4. LED linear constant-current control circuit according to claim 3, it is characterised in that the current output module includes Output current control module and output current control resistance, wherein, the output current control module includes first computing Amplifier, the first metal-oxide-semiconductor of N-channel and the second metal-oxide-semiconductor, first resistor, the in-phase input end of the first operational amplifier with it is described To receive the reference voltage, out-phase input is connected to obtain its output the connection of reference voltage module with third level clamper module Electric current, out-phase input also connects the source electrode of the first metal-oxide-semiconductor and the second metal-oxide-semiconductor, the first operational amplifier via first resistor Output end connect the grid of the first metal-oxide-semiconductor and the second metal-oxide-semiconductor, after the grid of the first metal-oxide-semiconductor and the second metal-oxide-semiconductor links together It is connected with clamp current control module, the source electrode of the first metal-oxide-semiconductor and the second metal-oxide-semiconductor is controlled after being connected together with the output current Resistance one end connection, output current control resistance the other end as it is described internally, the drain electrode of the first metal-oxide-semiconductor is used as electric current The input of output module, the drain electrode of the second metal-oxide-semiconductor is connected with the clamp reference voltage generation module.
5. LED linear constant-current control circuit according to claim 4, it is characterised in that the voltage sample module includes First sampling resistor and the second sampling resistor, the first order clamper module include the 3rd of the second operational amplifier and N-channel Metal-oxide-semiconductor, the second level clamper module includes the 4th metal-oxide-semiconductor of the 3rd operational amplifier and N-channel, the third level clamper mould Block includes the 5th metal-oxide-semiconductor of four-operational amplifier and N-channel, and the clamp current control module includes the 5th operational amplifier And the 6th metal-oxide-semiconductor and the 7th metal-oxide-semiconductor of N-channel；
First sampling resistor and the second sampling resistor be serially connected in the input of current output module and internally between, it is described The connecting node of the first sampling resistor and the second sampling resistor is respectively connecting to the second operational amplifier, the 3rd operation amplifier simultaneously The in-phase input end of device, four-operational amplifier, out-phase input and the clamp reference voltage of the second operational amplifier produce mould Block is connected to receive first clamp reference voltage, and the out-phase input of the 3rd operational amplifier is connected with reference voltage module To receive second clamp reference voltage, the out-phase input of four-operational amplifier is connected to receive with reference voltage module 3rd clamp reference voltage, the 3rd metal-oxide-semiconductor, the drain electrode of the 4th metal-oxide-semiconductor are connected to the input of current output module, the The grid of three metal-oxide-semiconductors is connected to the drain electrode that the output end of the second operational amplifier, source electrode are connected to the 6th metal-oxide-semiconductor, the 4th metal-oxide-semiconductor Grid be connected to the drain electrode that the output end of the 3rd operational amplifier, source electrode are connected to the 7th metal-oxide-semiconductor, the 6th metal-oxide-semiconductor and the 7th The grid of metal-oxide-semiconductor is connected after linking together with the first metal-oxide-semiconductor and the grid of the second metal-oxide-semiconductor in current output module, and the 6th The source electrode of metal-oxide-semiconductor and the 7th metal-oxide-semiconductor is connected after linking together with the output end of the 5th operational amplifier, the 5th operational amplifier In-phase input end connect the reference voltage module and be connected with output end with receiving the reference voltage, out-phase input, the The grid of five metal-oxide-semiconductors be connected to the output end of four-operational amplifier, source electrode be connected to internally, drain electrode connection electric current output mould The out-phase input of the first operational amplifier in block.
6. LED linear constant-current control circuit according to claim 2, it is characterised in that the clamp reference voltage is produced Module includes：
Output current sampling module, input connects the current output module, for obtaining the output current and generation one The individual and proportional sample rate current of output current；
First clamp reference voltage generation module, input connects the output end of the output current sampling module, and output end connects First order clamper module is connect, for the sample rate current to be converted into corresponding voltage as first clamp reference electricity Pressure.
7. LED linear constant-current control circuit according to claim 1, it is characterised in that first clamp reference voltage Generation module includes multiplier, and the output current sampling module includes two current mirrors, and first input of current mirror connects Connect the current output module, output end and connect second input of current mirror, the output end connection of second current mirror multiplies The input of musical instruments used in a Buddhist or Taoist mass, the output end connection first order clamper module of multiplier.
8. a kind of LED light emission device, it is characterised in that including：For the rectification input module, the N number of LED light group that are electrically connected with city And N number of LED linear constant-current control circuit as described in claim any one of 1-7, N number of LED light group and N number of LED linear Constant-current control circuit is serially connected between the positive output end of rectification input module and negative output terminal, and LED light group and LED linear constant current Control circuit is spaced.
CN201710089077.4A 2017-02-20 2017-02-20 A kind of the LED linear constant-current control circuit and LED light emission device of adaptive clamper Active CN106851911B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116963347A (en) * 2023-09-20 2023-10-27 深圳市明微电子股份有限公司 LED drive circuit, drive device and lighting device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102419612A (en) * 2011-11-30 2012-04-18 中国科学院微电子研究所 Biasing circuit of load
CN102790516A (en) * 2012-08-02 2012-11-21 电子科技大学 Feedback clamping power metal oxide semiconductor (MOS) pipe drive circuit for power supply management
US20150222180A1 (en) * 2014-02-06 2015-08-06 Seiko Instruments Inc. Switching regulator control circuit and switching regulator
CN105656342A (en) * 2016-04-15 2016-06-08 阳光电源股份有限公司 Method and circuit for adjusting overcurrent protection threshold value

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102419612A (en) * 2011-11-30 2012-04-18 中国科学院微电子研究所 Biasing circuit of load
CN102790516A (en) * 2012-08-02 2012-11-21 电子科技大学 Feedback clamping power metal oxide semiconductor (MOS) pipe drive circuit for power supply management
US20150222180A1 (en) * 2014-02-06 2015-08-06 Seiko Instruments Inc. Switching regulator control circuit and switching regulator
CN105656342A (en) * 2016-04-15 2016-06-08 阳光电源股份有限公司 Method and circuit for adjusting overcurrent protection threshold value

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116963347A (en) * 2023-09-20 2023-10-27 深圳市明微电子股份有限公司 LED drive circuit, drive device and lighting device
CN116963347B (en) * 2023-09-20 2024-01-19 深圳市明微电子股份有限公司 LED drive circuit, drive device and lighting device

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