CN106455227B - A kind of LED linear constant-current control circuit and LED light emission device - Google Patents
A kind of LED linear constant-current control circuit and LED light emission device Download PDFInfo
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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
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Abstract
A kind of LED linear constant-current control circuit and LED light emission device, the control circuit connects LED light string, LED light string is serially connected by N number of LED light group, control circuit includes: reference voltage generation module, for sampling the input voltage of LED light string, input voltage is changed into N number of reference voltage with different constant peaks and with input voltage with phase；N number of output current control module, the control terminal of N number of output current control module receives a corresponding reference voltage correspondingly, input terminal is respectively connected to the output end of corresponding LED light group, output end is grounded after being connected in parallel by first resistor, M LED light group conducting before when the input voltage of LED light string reaches the forward conduction voltage of M LED light group, and electric current corresponding with m-th reference voltage is generated in first resistor via m-th output current control module, power factor of the present invention is high, total harmonic distortion is low and is able to maintain and flows through the electric current of LED light and do not change with input voltage peak change.
Description
Technical field
The present invention relates to LED display field more particularly to a kind of LED linear constant-current control circuit and LED light emission devices.
Background technique
Currently, LED is as a kind of new type light source, because that it has the advantage that brightness is strong, low energy consumption and the service life is long is extensive
Applied to every field.Since LED has fixed forward conduction voltage, only reach total positive guide of entire LED light string
When the pressure that is powered, LED light string could shine.In order to guarantee that LED light string can work to normal table, need to carry out constant current control to it
System, and the linear constant current control method of traditional LED light string is exactly by the way that a linearity constant current control circuit is connected to input
Between the output end of rectification circuit and the input terminal of LED light string (as shown in Figure 1), or be connected to the output end of LED light string with
Between ground (as shown in Figure 2).And under the conditions of mains-supplied, when carrying out current constant control to LED light string using above-mentioned constant-current source,
LED light string can only can just shine when input voltage reaches its total forward conduction voltage, can make the utilization rate of LED low in this way and
Power factor is low, and total harmonic distortion is serious, and output electric current can follow input voltage peak change and change.
In order to solve above-mentioned traditional the problems of constant current control method of LED light string, the prior art proposes two
Kind solution.The first is to increase a filtering bulky capacitor by the output end in input rectification circuit, big by the filtering
Capacitor by input sine wave voltage filter at be higher than LED light string forward conduction voltage DC voltage, to make in LED light string
LED can in entire clock cycle continuous illumination, although the utilization rate of LED can be improved in this way, reduce power because
Number, increases system total harmonic distortion (THD) and increases system cost simultaneously, can not solve the problems, such as input not constant current；
Second is by reducing the LED quantity in LED light string, thus by reducing the total forward conduction voltage of LED light string
Increase LED in the fluorescent lifetime of each clock cycle, improves the utilization rate of LED.But this solution can make LED linear
Constant-current control circuit bears bigger voltage, increases the power consumption of driving circuit, reduces system effectiveness, can not also solve to input
The problem of not constant current.
In conclusion that there are power factors is low, system total harmonic distortion is serious and system effectiveness is low and input for the prior art
The problem of not constant current.
Summary of the invention
The technical problem to be solved in the present invention is that in view of the above drawbacks of the prior art, providing a kind of LED linear constant current
Control circuit and LED light emission device.
The technical solution adopted by the present invention to solve the technical problems is: constructing a kind of LED linear constant-current control circuit, uses
In connection LED light string, the LED light string is serially connected by N number of LED light group, and the LED linear constant-current control circuit includes:
The input voltage sampled is changed into tool for sampling the input voltage of LED light string by reference voltage generation module
There are different constant peaks and N number of reference voltage with input voltage with phase；
The control terminal of N number of output current control module, N number of output current control module is respectively connected to reference voltage
Generation module to receive a corresponding reference voltage correspondingly, input terminal is respectively connected to the defeated of corresponding LED light group
Outlet, output end are grounded after being connected in parallel by first resistor, when the input voltage of LED light string is reaching M LED light group just
M LED light group conducting before when to conducting voltage, and is generated in first resistor via m-th output current control module and
The corresponding electric current of m-th reference voltage, wherein M, N are positive integer, and M is less than or equal to N.
In LED linear constant-current control circuit of the present invention, the reference voltage generation module includes:
Input voltage sampling module, input terminal connect the input terminal of LED light string, obtain the sine of peak change for sampling
Wave signal；
Multiplication module, for will sampling obtain peak change sine wave signal be changed into peak value fix and with input electricity
Press the sine wave signal with phase；
Output circuit is divided, for fixing the peak value and dividing to form institute with the sine wave signal of phase with input voltage
State N number of reference voltage.
In LED linear constant-current control circuit of the present invention, the multiplication module includes that crest voltage sampling is protected
Hold circuit and multiplier circuit；One input terminal of the multiplier circuit connect with the output end of input voltage sampling module,
Another input terminal is connect via the crest voltage sampling hold circuit with the output end of input voltage sampling module, multiplier
The output end of circuit is connected to the partial pressure output circuit.
In LED linear constant-current control circuit of the present invention, the partial pressure output circuit includes first operation
Amplifier, the first metal-oxide-semiconductor of N-channel and the bleeder circuit with N number of partial pressure coefficient, first operational amplifier
Non-inverting input terminal connects the output end of the multiplier circuit, out-phase input terminal is grounded via the bleeder circuit, and described first
The out-phase input terminal of operational amplifier is also connected to the source electrode of the first metal-oxide-semiconductor via a resistance, and the grid of the first metal-oxide-semiconductor is connected to
The drain electrode of the output end of first operational amplifier, the first metal-oxide-semiconductor connects built-in power.
In LED linear constant-current control circuit of the present invention, each output current control module includes: one
Second metal-oxide-semiconductor of a second operational amplifier and a N-channel；The non-inverting input terminal of second operational amplifier is as output electric current
The control terminal of control module, out-phase input terminal connect the source electrode of the second metal-oxide-semiconductor, output end connects the grid of the second metal-oxide-semiconductor, and second
Output end of the source electrode of metal-oxide-semiconductor as output current control module, the second metal-oxide-semiconductor are missed as output current control module
Input terminal.
In LED linear constant-current control circuit of the present invention, the output of two adjacent output current control modules
It further include a current regulating resistance between end.
The invention also discloses a kind of LED light emission devices, comprising: the rectification for providing input voltage to LED light string is defeated
Enter module, LED light string and the LED linear constant-current control circuit.
In LED light emission device of the present invention, each LED light group by the LED light of different number it is in series or in parallel or
The series-parallel combination of person combines to obtain.
Implement LED linear constant-current control circuit and LED light emission device of the invention, has the advantages that this hair
The bright input voltage that can make LED light string correspondingly drives LED light group constant current therein to shine step by step, realizes and is not increasing height
Under the premise of cost component, the utilization rate of LED is improved, greatly promotes the power factor of entire LED linear constant-current control circuit
And system effectiveness, significantly reduce system total harmonic distortion, while the input voltage that reference voltage generation module will sample
It is changed into N number of reference voltage with different constant peaks and with input voltage with phase, when the input voltage of LED light string reaches M
M LED light group conducting before when the forward conduction voltage of a LED light group, and via m-th output current control module first
Electric current corresponding with m-th reference voltage is generated on resistance, since each reference voltage is that peak value is fixed, with input voltage
Peak value it is unrelated, do not change with input voltage peak change so being able to maintain and flowing through the electric current of LED light, realize really input
Constant current.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is a kind of structural schematic diagram of traditional LED linear constant-current control circuit；
Fig. 2 is the structural schematic diagram of another traditional LED linear constant-current control circuit；
Fig. 3 is the module frame chart of the first embodiment of LED linear constant-current control circuit of the invention；
Fig. 4 is the electrical block diagram of the output current control module in Fig. 3；
Fig. 5 is the electrical block diagram of the reference voltage generation module in Fig. 3；
Fig. 6 is the electrical block diagram of the crest voltage sampling hold circuit in Fig. 5；
Fig. 7 is the input circuit structural schematic diagram of traditional LED drive power；
Fig. 8 is the waveform diagram of the AC-input voltage of circuit shown in Fig. 7, lamp string input voltage, AC input current；
Fig. 9 is the waveform diagram of present invention AC-input voltage, lamp string input voltage, AC input current when N takes 4；
Figure 10 is the electrical block diagram of the second embodiment of LED linear constant-current control circuit of the invention.
Specific embodiment
For a clearer understanding of the technical characteristics, objects and effects of the present invention, now control attached drawing is described in detail
A specific embodiment of the invention.
It is the module frame chart of the first embodiment of LED linear constant-current control circuit of the invention with reference to Fig. 3.
LED light emission device of the invention includes: for providing the rectification input module of input voltage to LED light string 200
100, LED light string 200 and LED linear constant-current control circuit 300.The LED light string 200 is serially connected in one by N number of LED light group
It rising, the quantity of the LED light in each LED light group can be equal or differs, and the connection type of each LED light group can also be different,
Such as all LED light in a LED light group can be in series or in parallel or series-parallel combination.In such as figure, N number of LED light
Group is respectively as follows: LED1、LED2、…、LEDn-1、LEDn。
Wherein, the LED linear constant-current control circuit 300 includes: reference voltage generation module 310, N number of output electric current control
Molding block and a first resistor Re.In such as figure, N number of output current control module is respectively as follows: CTR1、CTR2、…、CTRn-1、
CTRn。
Reference voltage generation module 310 turns the input voltage sampled for sampling the input voltage of LED light string 200
Become that there is different constant peaks and N number of reference voltage with input voltage with phase, in figure, N number of reference voltage is respectively indicated
Are as follows: V1、V2、…、Vn-1、Vn。
The control terminal of N number of output current control module, N number of output current control module is respectively connected to reference voltage
Generation module 310 to receive a corresponding reference voltage correspondingly, input terminal is respectively connected to corresponding LED light group
Output end, output end are grounded after being connected in parallel by first resistor Re, when the input voltage of LED light string 200 reaches M LED
M LED light group conducting before when the forward conduction voltage of lamp group, and via m-th output current control module in first resistor
Electric current corresponding with m-th reference voltage is generated on Re, wherein M, N are positive integer, and M is less than or equal to N.
It is the electrical block diagram of the output current control module in Fig. 3 with reference to Fig. 4.
Each output current control module includes: the metal-oxide-semiconductor of an operational amplifier and a N-channel；Such as figure
In, first output current control module CTR1Including operational amplifier OP1, metal-oxide-semiconductor M1, second output current control module
CTR2Including operational amplifier OP2, metal-oxide-semiconductor M2, and so on.In each output current control module, operational amplifier
Non-inverting input terminal is as the control terminal of output current control module, the source electrode of out-phase input terminal connection metal-oxide-semiconductor, output end connection
The grid of metal-oxide-semiconductor, output end of the source electrode of metal-oxide-semiconductor as output current control module, metal-oxide-semiconductor are missed as output electric current control
The input terminal of molding block.
With continued reference to Fig. 3, the reference voltage generation module 310 includes: input voltage sampling module 311, multiplier mould
Block 312, partial pressure output circuit 313.Wherein:
Input voltage sampling module 311, input terminal connect the input terminal of LED light string 200, obtain peak change for sampling
Sine wave signal, in specific embodiment, input voltage sampling module 311 includes the output for being serially connected with rectification input module 100
Two divider resistances between (i.e. the input terminal of LED light string 200) and ground are held, the connecting node of two divider resistances is as input
The output end of voltage sample module 311.
Multiplication module 312, for will sampling obtain peak change sine wave signal be changed into peak value fix and with it is defeated
Enter the sine wave signal of arc in phase.It is the electrical block diagram of the reference voltage generation module in Fig. 3 with reference to Fig. 5.With reference to
Fig. 6 is the electrical block diagram of the crest voltage sampling hold circuit in Fig. 5.
Specifically, the multiplication module 312 includes crest voltage sampling hold circuit and multiplier circuit；The multiplication
One input terminal of device circuit is connect with the output end of input voltage sampling module 311, another input terminal is via the peak value
Voltage sample holding circuit is connect with the output end of input voltage sampling module 311, and the output end of multiplier circuit is connected to institute
State partial pressure output circuit 313.
Crest voltage sampling hold circuit includes: diode D1, operational amplifier Amp1, N-channel MOS pipe M0, capacitor C0,
Output end, the cathode of the anode connection input voltage sampling module 311 of diode D1 connect the same mutually defeated of operational amplifier Amp1
Enter end, the out-phase input terminal of operational amplifier Amp1 connects the source electrode of metal-oxide-semiconductor M0 and via capacitor C0 ground connection, operational amplifier
The grid of the output end connection metal-oxide-semiconductor M0 of Amp1, the drain electrode of metal-oxide-semiconductor M0 connect built-in power, and the source electrode of metal-oxide-semiconductor M0 is as peak value
The output end of voltage sample holding circuit is connected to an input terminal of multiplier circuit.
It is understood that crest voltage sampling hold circuit is not limited to the circuit structure in the present embodiment, as long as energy
It realizes peak value sampling and keeps to realize technical effect of the invention, all within protection scope of the present invention.Multiplier electricity
Road can be using the circuit structure in Fig. 6, and the multiplier that electronic field can also be used common is without limitation.
Output circuit 313 is divided, for fixing the peak value and dividing shape with the sine wave signal of phase with input voltage
At N number of reference voltage.With continued reference to Fig. 5, the partial pressure output circuit 313 include a first operational amplifier Amp4,
First metal-oxide-semiconductor of one N-channel and there is N number of partial pressure coefficient (k1, k2..., kn-1, kn) bleeder circuit, it is described first fortune
The non-inverting input terminal for calculating amplifier Amp4 connects the output end of the multiplier circuit, out-phase input terminal via the bleeder circuit
Ground connection, the out-phase input terminal of the first operational amplifier Amp4 are also connected to the source electrode of the first metal-oxide-semiconductor via a resistance, and first
The grid of metal-oxide-semiconductor is connected to the output end of the first operational amplifier Amp4, and the drain electrode of the first metal-oxide-semiconductor connects built-in power.
Below with reference to first embodiment, the working principle of the invention is elaborated.
In conjunction with Fig. 3 and Fig. 5, after the rectification of the rectifier bridge of over commutation input module 100, obtain the period is input ac voltage
The DC voltage of π, instantaneous voltage expression formula are as follows: Vpp* sin (ω t), wherein VppTo input crest voltage.The voltage is by defeated
Enter after voltage sample module 311 divides and exportsInput voltage as multiplication module 312.Multiply
Crest voltage sampling hold circuit in summer block 312 exports the peak value of the input voltage:
Assuming that the stringent matching of NPN pipe in circuit in figure, gain beta having the same and sufficiently large, so that can neglect
The slightly influence of base current, according to the characteristic (concrete operating principle of multiplier no longer describes) of multiplier, have following formula at
It is vertical:
I1*I2=I3*I4 (1)
Wherein I1For bias current, immobilize；
Now for convenience of calculation, it is assumed that all current mirror mirror ratios be 1:1, available each current expression:
Formula (2), (3) are substituted into above formula (1), obtain output electric current:
By electric current I4It is added in resistance Rp4On, obtain the output voltage of multiplication module 312 are as follows:The voltage input divides output circuit 313, and it is as follows to obtain N number of reference voltage:
Wherein, k1, k2..., kn-1, knTo divide coefficient, it is unequal constant, assume that V here1< V2< ... <
Vn-1< Vn。
It can be seen that N number of reference voltage is unrelated with gauze input voltage peak value, it is same as gauze input voltage to be rendered as
Sine wave characteristics and without phase difference.Now, and gauze sine voltage unrelated with gauze voltage peak has been obtained without phase difference
Sine voltage.
System total harmonic distortion is illustrated first below.
Many LED drive powers on the market, input circuit are filtered using simple bridge rectifier and electrolytic capacitor
Circuit, as shown in fig. 7, the circuit is only near the peak value of input ac voltage, rectifier diode can be just connected, therefore it is led
Current flow angle θ smaller (about 60 °) causes input current waveform for pointed pulse (pulsewidth is about 3ms), AC-input voltage,
Lamp string input voltage and AC input current waveform are as shown in Figure 8.It can be seen that LED power AC input current is caused to distort
Basic reason be caused by having used the capacitive load of DC filtering electrolytic capacitor.
According to Fourier (Fourier) shift theory, instantaneous input current can be indicated are as follows:
In formula, n is overtone order, Fourier coefficient anAnd bnIt respectively indicates are as follows:
Each current harmonics, it will usually have a sine or cosine period, nth harmonic current effective value In,rmsIt can use
Following formula is calculated:
Input total current virtual value are as follows:
In above formula, I1,rmsFor fundamental current virtual value, total harmonic distortion are as follows:
According to the definition of power factor (PF) PF, power factor PF refers to the active-power P and output apparent energy S of exchange input
Ratio, it may be assumed that
Wherein, U is input supply voltage, cos θ1For phase shift factor, θ1For fundamental phase shift angle.
In conjunction with above formula (11), (12) to obtain:
It follows that in phase shift factor cos θ1When constant, reducing total harmonic distortion can be improved power factor (PF) PF.
To the working principle of the invention and how to realize that high PF value and low total harmonic distortion are made below in conjunction with above-mentioned principle
It further illustrates.
When the rectifier bridge for rectifying input module 100 accesses alternating current, 200 input voltage of LED light string is begun to ramp up from 0V,
When lamp string input voltage reaches first LED light group LED1Forward conduction voltage when, due to operational amplifier OP1It is same mutually defeated
Enter to hold institute input reference voltage V1Greater than the voltage of its out-phase input terminal, so operational amplifier OP1Output end export high level
Drive M1It is connected, at this time M1Source voltage and reference voltage V1Equal, then the voltage of the first end of first resistor Re is also V1,
Therefore, the electric current I of LED light group LED1 is flowed throughLED1It is shown below:
As the input voltage of LED light string 200 continues to rise, when the input voltage reaches the positive guide of two LED light groups
The LED when pressure that is powered1、LED2Conducting, due to operational amplifier OP2The reference voltage V that is inputted of non-inverting input terminal2It is different greater than its
The voltage V of phase input terminal1(operational amplifier OP2Out-phase input terminal and M1Source electrode connection, herein voltage be V1), so fortune
Calculate amplifier OP2Output end output high level drive M2Conducting, LED light group LED1With LED2In all LED shine, and
NMOS tube M2Source voltage be also V2, i.e. operational amplifier OP1Out-phase input terminal voltage by V1Become V2, then operation is put
Big device OP1Out-phase input terminal voltage V2Greater than the voltage V of its non-inverting input terminal1, so operational amplifier OP1Export low electricity
It is flat to make NMOS tube M1Cut-off, LED light group LED1With LED2By output current control module CTR2Control, it is achieved that from output
Current control module CTR1Switching is transitted to by output current control module CTR2To LED light group LED1With LED2Carry out the control that shines
System, at the same time, the voltage of the first end of first resistor Re also rises to V2, therefore, flow through LED light group LED1With LED2Electricity
Flow ILED2It is shown below:
The rest may be inferred, with the lasting rising of input voltage, output control module CTR3To CTRnCan according to it is above-mentioned work into
Cheng Jixu is promoted, and drives more LED light groups to shine backward step by step during input voltage continues and rises to reach, until
Until all LED light groups all shine in LED light string 200, i.e. LED light group LED1To LEDnIt shines, at this point, flowing through all LED light
The electric current I of groupLEDnIt is shown below:
According to above formula, by taking N takes 4 as an example, AC-input voltage, lamp string input voltage, AC input current wave
Shape figure such as Fig. 9.In figure, VAC、VDC、IACRespectively indicate AC-input voltage, lamp string input voltage, AC input current.It flows through
The electric current of LED is the absolute value of AC input current.
Integral calculation is carried out within the entire gauze period to LED current, flows through LED in the available entire gauze period
Current average are as follows:
All parameters are unrelated with input voltage peak value in above formula, flow through the electric current of LED by reference voltage and ReResistance
It determines.
By being shifted above it is found that due to V1< V2< ... < Vn-1< Vn, therefore ILED1< ILED2< ... < ILEDn-1< ILEDn,
This makes the electric current (i.e. output electric current) for flowing through the LED light group to shine that input voltage can be followed to synchronize variation, greatly
The angle of flow of rectifier diode is extended greatly, therefore improves system power factor and efficiency.Meanwhile gauze input voltage by
During gradual change, input current (electric current for namely flowing through LED light string 200) can be good at that input voltage is followed to carry out together
Step variation, the basic continuity and sine wave characteristics for maintaining input current within the entire gauze period and without phase difference, therefore
System total harmonic distortion can greatly be reduced, system PF value and efficiency are further increased.Moreover, flowing through the electric current of LED light group
Equal to the electric current that some reference voltage generates on first resistor Re, since the multiplication module 312 that the present invention includes can make
N number of reference voltage peak value fix and with the same phase of input voltage, therefore flow through the peak value of the electric current (i.e. output electric current) of LED
Do not change with the variation of gauze crest voltage, output electric current will not follow gauze crest voltage to change and change, and realize excellent
Different constant-current characteristics.
Second embodiment of the invention is described below.
It is the electrical block diagram of the second embodiment of LED linear constant-current control circuit of the invention with reference to Figure 10.
In second embodiment of the invention, unlike first embodiment is unique: two adjacent output current controls
It further include a current regulating resistance between the output end of module.Such as figure resistance R1To Rn-1, resistance R1It is connected to output electric current control
Molding block CTR1With output current control module CTR2Between, resistance R2It is connected to output current control module CTR2With output electricity
Flow control module CTR3Between, and so on, resistance Rn-1It is connected to output current control module CTRn-1With output current control
Module CTRnBetween.
Multiple resistance R are added in the present embodiment1To Rn-1Purpose be on the basis of first embodiment, to flowing through LED light
The electric current for the one or more LED light groups being driven to emit light in string 200 realizes more flexible adjustment, so that optimization is to constant current control
Effect processed.Due to being the adjustment to LED light group electric current is flowed through, multiple resistance R1To Rn-1Resistance value it is relatively small.
LED linear constant-current control circuit 300 shown in Fig. 10 is described further mainly in conjunction with working principle below:
Similarly, when rectifier bridge accesses alternating current, 200 input voltage of LED light string is begun to ramp up from 0V, when input voltage reaches
To LED light group LED1Forward conduction voltage when, M1Conducting, the voltage of the first end of first resistor Re are V1, therefore, flow through LED
The electric current I of lamp group LED1LED1It is shown below:
Similarly, as input voltage continues to rise, when the input voltage reaches the forward conduction voltage of two LED light groups
When, from output current control module CTR1Switching is transitted to by output current control module CTR2To LED light group LED1With LED2Into
Row light emitting control, at the same time, the voltage of the first end of first resistor Re also rise to V2, flow through LED light group LED1With LED2's
Electric current ILED2It is shown below:
The rest may be inferred, with the lasting rising of input voltage, output control module CTR3To CTRnCan according to it is above-mentioned work into
Cheng Jixu is promoted, and drives more LED light groups to shine backward step by step during input voltage continues and rises to reach, until
Until all LED light groups all shine in LED light string 200, i.e. LED light group LED1To LEDnIt shines, at this point, flowing through all LED light
The electric current I of groupLEDnIt is shown below:
Similarly, due to V1< V2< ... < Vn-1< Vn, therefore ILED1< ILED2< ... < ILEDn-1< ILEDn, this to flow through
The electric current of the LED light group to shine can follow input voltage to synchronize variation, greatly expand leading for rectifier diode
Current flow angle, therefore improve system power factor and efficiency.Meanwhile during gauze input voltage gradually changes, input current
(electric current for namely flowing through LED light string 200) can be good at that input voltage is followed to synchronize variation, basic to maintain input electricity
Flow continuity within the entire gauze period and sine wave characteristics and without phase difference, therefore it is always humorous to reduce system
Wave distortion further increases system PF value and efficiency.Moreover, the electric current for flowing through LED light group is equal to some reference voltage first
The electric current generated on resistance Re, since the multiplication module 312 that the present invention includes enables to the peak value of N number of reference voltage to fix
And with the same phase of input voltage, therefore flow through LED electric current (i.e. output electric current) peak value also not with the variation of gauze crest voltage
And change, output electric current will not follow gauze crest voltage to change and change, and realize excellent constant-current characteristics.
Another object of the present invention, which also resides in, provides a kind of LED light emission device, and device includes: for mentioning to LED light string 200
For rectification input module 100, LED light string 200 and the LED linear constant-current control circuit 300 of input voltage.
In conclusion the present invention can make the input voltage of LED light string correspondingly drive LED light group constant current therein step by step
It shines, realizes under the premise of not increasing high cost component, improve the utilization rate of LED, it is permanent greatly to promote entire LED linear
The power factor and system effectiveness of flow control circuit significantly reduce system total harmonic distortion, while reference voltage generates mould
The input voltage sampled is changed into N number of reference voltage with different constant peaks and with input voltage with phase by block, works as LED
M LED light group is connected before when the input voltage of lamp string reaches the forward conduction voltage of M LED light group, and defeated via m-th
Current control module generates electric current corresponding with m-th reference voltage in first resistor out, since each reference voltage is
What peak value was fixed, it is unrelated with the peak value of input voltage, so being able to maintain the electric current for flowing through LED light not with input voltage peak change
And change, realize really input constant current.
The embodiment of the present invention is described with above attached drawing, but the invention is not limited to above-mentioned specific
Embodiment, the above mentioned embodiment is only schematical, rather than restrictive, those skilled in the art
Under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, it can also make very much
Form, all of these belong to the protection of the present invention.
Claims (7)
1. a kind of LED linear constant-current control circuit, for connecting LED light string, the LED light string is serially connected in one by N number of LED light group
It rises, which is characterized in that the LED linear constant-current control circuit includes:
Reference voltage generation module, for sampling the input voltage of LED light string, the input voltage sampled, which is changed into, to be had not
With constant peak and with input voltage with N number of reference voltage of phase；
The control terminal of N number of output current control module, N number of output current control module is respectively connected to reference voltage generation
Module to receive a corresponding reference voltage correspondingly, input terminal be respectively connected to corresponding LED light group output end,
Output end is grounded after being connected in parallel by first resistor, when the input voltage of LED light string reaches the positive guide of M LED light group
M LED light group conducting before when the pressure that is powered, and export current control module via m-th and generated in first resistor and m-th
The corresponding electric current of reference voltage, wherein M, N are positive integer, and M is less than or equal to N；
Wherein, the reference voltage generation module includes:
Input voltage sampling module, input terminal connect the input terminal of LED light string, obtain the sine wave letter of peak change for sampling
Number；
Multiplication module, for will sampling obtain peak change sine wave signal be changed into peak value fix and with input voltage it is same
The sine wave signal of phase；
Output circuit is divided, for fixing the peak value and dividing to form the N with the sine wave signal of phase with input voltage
A reference voltage.
2. LED linear constant-current control circuit according to claim 1, which is characterized in that the multiplication module includes peak
Threshold voltage sampling hold circuit and multiplier circuit；One input terminal of the multiplier circuit and input voltage sampling module
Output end connection, another input terminal via the crest voltage sampling hold circuit and input voltage sampling module output end
Connection, the output end of multiplier circuit are connected to the partial pressure output circuit.
3. LED linear constant-current control circuit according to claim 1, which is characterized in that the partial pressure output circuit includes
One the first operational amplifier, the first metal-oxide-semiconductor of N-channel and the bleeder circuit with N number of partial pressure coefficient, described first
The non-inverting input terminal of operational amplifier connects the output end of the multiplication module, out-phase input terminal connects via the bleeder circuit
Ground, the out-phase input terminal of first operational amplifier are also connected to the source electrode of the first metal-oxide-semiconductor, the first metal-oxide-semiconductor via a resistance
Grid be connected to the output end of the first operational amplifier, the drain electrode of the first metal-oxide-semiconductor connects built-in power.
4. LED linear constant-current control circuit according to claim 1, which is characterized in that each output current control
Module includes: second metal-oxide-semiconductor an of second operational amplifier and a N-channel；The homophase input of second operational amplifier
The control terminal as output current control module, out-phase input terminal is held to connect the source electrode of the second metal-oxide-semiconductor, output end connection second
The grid of metal-oxide-semiconductor, output end of the source electrode of the second metal-oxide-semiconductor as output current control module, the second metal-oxide-semiconductor are missed as defeated
The input terminal of current control module out.
5. LED linear constant-current control circuit according to claim 1, which is characterized in that two adjacent output electric current controls
It further include a current regulating resistance between the output end of molding block.
6. a kind of LED light emission device characterized by comprising the rectification for providing input voltage to LED light string inputs mould
Block, LED light string and LED linear constant-current control circuit as described in any one in claim 1-5.
7. LED light emission device according to claim 6, which is characterized in that each LED light group by different number LED light string
Connection or in parallel or series-parallel combination combine to obtain.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610993838.4A CN106455227B (en) | 2016-11-11 | 2016-11-11 | A kind of LED linear constant-current control circuit and LED light emission device |
| PCT/CN2017/070701 WO2018086244A1 (en) | 2016-11-11 | 2017-01-10 | Led linear constant current control circuit and led light emitting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610993838.4A CN106455227B (en) | 2016-11-11 | 2016-11-11 | A kind of LED linear constant-current control circuit and LED light emission device |
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| CN106455227A CN106455227A (en) | 2017-02-22 |
| CN106455227B true CN106455227B (en) | 2019-02-01 |
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| CN201610993838.4A Active CN106455227B (en) | 2016-11-11 | 2016-11-11 | A kind of LED linear constant-current control circuit and LED light emission device |
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| WO (1) | WO2018086244A1 (en) |
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| CN111642042B (en) * | 2019-03-01 | 2023-02-28 | 华润微集成电路(无锡)有限公司 | Linear LED drive circuit and drive method thereof |
| CN110307477A (en) * | 2019-08-05 | 2019-10-08 | 厦门集长新材料科技有限公司 | A cuttable constant voltage LED light strip |
| CN112839406B (en) * | 2019-11-07 | 2023-05-30 | 华润微集成电路(无锡)有限公司 | Linear LED driving system and driving method |
| CN110913531B (en) * | 2019-11-29 | 2025-02-28 | 深圳市晟碟半导体有限公司 | A multi-segment linear LED driving circuit, device and driving method |
| CN111200892B (en) * | 2020-02-28 | 2023-08-29 | 深圳市晟碟半导体有限公司 | LED control device, circuit and control method thereof |
| EP4240111A4 (en) | 2020-11-04 | 2024-04-03 | Suzhou Opple Lighting Co., Ltd. | Control circuit and lighting device |
| CN113365388A (en) * | 2021-03-18 | 2021-09-07 | 上海可大光电科技有限公司 | Lamp strip and lamp driven by constant-current power supply |
| CN113630933B (en) * | 2021-09-18 | 2024-02-27 | 上海三思电子工程有限公司 | LED driver, driving circuit and driving method |
| CN114205963A (en) * | 2021-12-21 | 2022-03-18 | 欧普照明股份有限公司 | Linear LED driving circuit and driving method |
| CN116419450A (en) * | 2021-12-29 | 2023-07-11 | 美芯晟科技(北京)股份有限公司 | Constant current output control system and method |
| CN116634626B (en) * | 2023-01-16 | 2024-05-28 | 深圳新摩尔半导体有限公司 | Constant-current control circuit for LED lamp and LED lamp |
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| Publication number | Publication date |
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| CN106455227A (en) | 2017-02-22 |
| WO2018086244A1 (en) | 2018-05-17 |
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