CN107231719B - LED driving light modulation feedback control circuit - Google Patents
LED driving light modulation feedback control circuit Download PDFInfo
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- CN107231719B CN107231719B CN201610178558.8A CN201610178558A CN107231719B CN 107231719 B CN107231719 B CN 107231719B CN 201610178558 A CN201610178558 A CN 201610178558A CN 107231719 B CN107231719 B CN 107231719B
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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]
- H05B45/10—Controlling the intensity of the light
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Abstract
The present invention provides a kind of LED driving light modulation feedback control circuit, comprising: voltage input module, at least one control chip, first resistor, second resistance, 3rd resistor, sampling resistor, first capacitor, the second capacitor, the first load and optical coupling module.The present invention passes through the feedback control function for adding control chip offer light modulation, has the advantages that output electric current without working frequency ripple wave, does not have the flashing of working frequency ripple wave；Light modulation is not necessarily to DC_DC module, and does not have audio-frequency noise when PWM light modulation；Light modulation depth can achieve 1%；The efficiency of entire control circuit is higher；Multiple control chip parallel outputs, can be improved output electric current, the application suitable for High Output Current.
Description
Technical field
The invention belongs to LED technology fields, drive light modulation feedback control circuit more particularly to a kind of LED.
Background technique
In the dimmer application of current LED illumination, common LED adjusting control circuit is as shown in Figure 1, include successively connecting
AC power source AC, first order AC (exchange)-DC (direct current) constant voltage output module 11, the second level tunable optical DC (the direct current)-DC connect
(direct current) module 12 and load 13.The first order AC-DC output constant pressure module 11 and the second level tunable optical DC-DC module
12 have mature application, but cost is relatively high, and the second level tunable optical DC-DC module 12 can bring additional EMC
(Electro magnetic compatibility, Electro Magnetic Compatibility) and interference problem.
Another LED adjusting control circuit will scheme in Fig. 2 as shown in Fig. 2, compared to the LED adjusting control circuit in Fig. 1
The second level tunable optical DC-DC module 12 in 1 replaces with switching tube 14, and structure can be made simple, reduces cost, but should
The LED adjusting control circuit problem poor, inefficient there are the electric current constant-current characteristics of the load 13.
In another LED adjusting control circuit, as shown in figure 3, corresponding to improve efficiency and simplify system design
The first order AC-DC constant voltage output module 11 in Fig. 1 and Fig. 2 no longer uses constant voltage output, but direct constant current output；And
And the chip 15 in the LED adjusting control circuit has DIM (brightness control) pin, can directly carrying out PWM, (pulse is wide
Degree modulation) or simulation brightness adjustment control.But there are the following problems for LED adjusting control circuit shown in Fig. 3: the electric current of 1. outputs exists
The working frequency ripple wave of electric main, if working frequency ripple wave is too big to generate scintillation；2.PWM control has some special limits
System: it if PWM light modulating frequency is too low, is easy mutually to interfere with work frequency to lead to the phenomenon that flashing, if PWM light modulating frequency
In audio range, the LED adjusting control circuit can generate audio-frequency noise when PWM is dimmed；If PWM light modulating frequency compared with
Height, due to the influence of some factors such as the LED adjusting control circuit internal conversion, will lead to light modulation depth cannot be too low, and one
As be unable to reach 1% light modulation depth requirements.
Summary of the invention
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide a kind of LED to drive light modulation feedback control
Circuit processed is easy to cause appearance for solving working frequency ripple wave of the electric current there are electric main of output existing in the prior art
The problem of flashing and PWM control require harshness, and PWM is easy to appear audio-frequency noise when dimming or light modulation depth is unable to reach 1%
Light modulation depth requirements the problem of.
In order to achieve the above objects and other related objects, the present invention provides a kind of LED driving light modulation feedback control circuit, institute
State LED driving light modulation feedback control circuit include: voltage input module, at least one control chip, first resistor, second resistance,
3rd resistor, sampling resistor, first capacitor, the second capacitor, the first load and optical coupling module；
The control chip includes builtin voltage module, constant-current control module, voltage control module and light-adjusting module；It is described
Builtin voltage module one end is electrically connected with the voltage input module, and the other end is grounded via the first capacitor, is suitable for generating
Chip interior voltage, and the externally output power supply after first capacitor filtering；Described constant-current control module one end is via
One load pin is electrically connected with first load, and the other end is electrically connected with the first resistor and the sampling resistor respectively,
Suitable for controlling the electric current of first load；Described voltage control module one end is connected to the constant-current control module and described the
Between one load, the other end is electrically connected with the second resistance and the 3rd resistor respectively, is suitable for generating control voltage, and will
The control voltage is after the second resistance, second capacitor filtering as control signal output；The light-adjusting module with
The constant-current control module electrical connection, suitable for driving light modulation feedback control circuit to carry out simulation light modulation and PWM tune the LED
Light；
The first resistor one end and the sampling resistor far from the constant-current control module are far from the current constant control
One end of module is grounded, suitable for setting the output electric current of the LED driving light modulation feedback control circuit；
The 3rd resistor is suitable for setting the center threshold voltage of the first load pin；
Second capacitor one end and the 3rd resistor far from the second resistance are far from the voltage control module
One end ground connection；
Described first loads one end far from the constant-current control module is electrically connected with the voltage input module；
Described optical coupling module one end is electrically connected with the second resistance far from one end of the voltage control module, the other end
It is connected between the builtin voltage module and the first capacitor, suitable for the control signal of output is fed back to the electricity
Press input module.
As a kind of preferred embodiment of LED driving light modulation feedback control circuit of the invention, the constant-current control module packet
It includes: switching tube, current setting unit setting and the first control operational amplifier；
The switching tube includes grid, source electrode and drain electrode；The grid of the switching tube and the first control operation amplifier
Device electrical connection, the source electrode of the switching tube are electrically connected with the sampling resistor, the drain electrode of the switching tube and first load
Electrical connection；
Described current setting unit setting one end is electrically connected with the first control operational amplifier, the other end and first electricity
Resistance electrical connection is adapted to detect for the output electric current of the LED driving light modulation feedback control circuit of the first resistor setting；
The first control operational amplifier includes first input end, the second input terminal and output end；First control
The first input end of operational amplifier is electrically connected with the sampling resistor, the second input terminal of the first control operational amplifier
It is electrically connected with the current setting unit setting, the grid of the output end and the switching tube of the first control operational amplifier is electrically connected
It connects, the output electric current suitable for detecting the current setting unit setting is compared with the electric current for flowing through the sampling resistor, and root
The electric current that control signal controls first load is exported according to comparison result.
As a kind of preferred embodiment of LED driving light modulation feedback control circuit of the invention, the voltage control module packet
It includes: voltage setup unit and the second control operational amplifier；
Voltage setup unit one end is electrically connected with the second control operational amplifier, the other end and third electricity
Resistance electrical connection is adapted to detect for the center threshold voltage of first load pin of the 3rd resistor setting；
The second control operational amplifier includes first input end, the second input terminal and output end；Second control
The first input end of operational amplifier is connected between the constant-current control module and first load, the second control fortune
Calculate amplifier the second input terminal be electrically connected with the voltage setup unit, it is described second control operational amplifier output end and
The second resistance electrical connection, the central value electricity of first load pin suitable for the 3rd resistor setting that will test
Pressure is compared with the practical center threshold voltage of first load pin, and according to one control voltage signal of comparison result output
To the second resistance.
As a kind of preferred embodiment of LED driving light modulation feedback control circuit of the invention, the optical coupling module includes the
Two loads and the 4th resistance；
Second load is electrically connected with the 4th resistance, and described second loads one end far from the 4th resistance
It is electrically connected with the voltage input module, the 4th resistance is connected to the builtin voltage far from one end of second load
Between module and the first capacitor.
As a kind of preferred embodiment of LED driving light modulation feedback control circuit of the invention, the voltage input module packet
The rectification filtering unit for including AC power source and being electrically connected with the AC power source.
As a kind of preferred embodiment of LED driving light modulation feedback control circuit of the invention, the quantity of the control chip
To be multiple, multiple control chip parallel outputs.
The present invention also provides a kind of LED to drive light modulation feedback control circuit, the LED driving light modulation feedback control circuit packet
It includes: voltage input module, at least one control chip, main circuit, first capacitor, the second capacitor and sampling resistor；
The control chip includes builtin voltage module, constant-current control module, voltage control module, main control module and tune
Optical module；Builtin voltage module one end is electrically connected with the voltage input module, and the other end connects via the first capacitor
Ground is suitable for generating chip interior voltage, and the externally output power supply after first capacitor filtering；The constant-current control module
One end is electrically connected via load pin with the main circuit, and the other end is grounded via the sampling resistor, is suitable for controlling the master
The electric current of circuit；Described voltage control module one end is connected between the constant-current control module and the main circuit, the other end
Lease making is suitable for generating control voltage by second capacity earth, and by the control voltage after second capacitor filtering
As control signal output；The light-adjusting module is electrically connected with the constant-current control module, is suitable for anti-to LED driving light modulation
Feedback control circuit carries out simulation light modulation and PWM light modulation；
Described main control module one end is electrically connected with the main circuit, and the other end is connected to the voltage control module and institute
It states between the second capacitor；
The input terminal of the main circuit is electrically connected with the voltage input module, output end and the main control module and institute
State constant-current control module electrical connection.
As a kind of preferred embodiment of LED driving light modulation feedback control circuit of the invention, the constant-current control module packet
It includes: first switch tube, current setting unit setting and the first control operational amplifier；
The first switch tube includes grid, source electrode and drain electrode；The grid of the first switch tube and first control
Operational amplifier electrical connection, the source electrode of the first switch tube are electrically connected with the sampling resistor, the leakage of the first switch tube
Pole is electrically connected with the main circuit；
The current setting unit setting is electrically connected with the first control operational amplifier, and the LED suitable for setting drives
Dim the output electric current of feedback control circuit；
The first control operational amplifier includes first input end, the second input terminal and output end；First control
The first input end of operational amplifier is electrically connected with the sampling resistor, the second input terminal of the first control operational amplifier
It is electrically connected with the current setting unit setting, the output end of the first control operational amplifier and the grid of the first switch tube
Electrical connection, the output electric current suitable for setting the current setting unit setting are compared with the electric current for flowing through the sampling resistor,
And the electric current that control signal controls the main circuit is exported according to comparison result.
As a kind of preferred embodiment of LED driving light modulation feedback control circuit of the invention, the voltage control module packet
It includes: voltage setup unit and the second control operational amplifier；
The voltage setup unit is electrically connected with the second control operational amplifier, the load pin suitable for setting
Center threshold voltage；
The second control operational amplifier includes first input end, the second input terminal and output end；Second control
The first input end of operational amplifier is connected between the constant-current control module and the main circuit, the second control operation
Second input terminal of amplifier is electrically connected with the voltage setup unit, the output end of the second control operational amplifier and institute
The second capacitor and main control module electrical connection are stated, suitable in the load pin that sets the voltage setup unit
Center value voltage is compared with the practical center threshold voltage of the load pin, and according to one control voltage letter of comparison result output
Number to second capacitor and the main control module.
As a kind of preferred embodiment of LED driving light modulation feedback control circuit of the invention, the voltage input module packet
The rectification filtering unit for including AC power source and being electrically connected with the AC power source.
As a kind of preferred embodiment of LED driving light modulation feedback control circuit of the invention, the main circuit includes: electricity
Sense, freewheeling diode, load, second switch, resistance and the 4th capacitor；
The inductance, the freewheeling diode and the load are sequentially connected, and the inductance is far from two pole of afterflow
One end of pipe is electrically connected with the voltage input module, described one end loaded far from the freewheeling diode and the constant current control
The electrical connection of molding block；
The second switch includes grid, source electrode and drain electrode；Described second open the light pipe grid and the master control molding
Block electrical connection, the source electrode of the second switch are electrically connected with the resistance, and the drain electrode of the second switch is connected to described
Between inductance and the freewheeling diode；
The resistance is grounded far from one end of the second switch；
Described 4th capacitor one end is connected between the freewheeling diode and the load, other end ground connection.
As described above, the present invention provides a kind of LED driving light modulation feedback control circuit, the present invention is by adding control chip
The feedback control function of light modulation is provided, has the advantages that output electric current without working frequency ripple wave, does not have the sudden strain of a muscle of working frequency ripple wave
It is bright；Light modulation is not necessarily to DC_DC module, and does not have audio-frequency noise when PWM light modulation；Light modulation depth can achieve 1%；Entire control
The efficiency of circuit is higher；Multiple control chip parallel outputs, can be improved output electric current, the application suitable for High Output Current.
Detailed description of the invention
Fig. 1 to Fig. 3 is shown as the schematic diagram of LED driving light modulation feedback control circuit in the prior art.
Fig. 4 is shown as the internal structure and electricity of the LED provided in the embodiment of the present invention one driving light modulation feedback control circuit
Road schematic diagram.
Fig. 5 is shown as the working timing figure of the LED provided in the embodiment of the present invention one driving light modulation feedback control circuit.
Fig. 6 is shown as the internal structure and electricity of the LED provided in the embodiment of the present invention two driving light modulation feedback control circuit
Road schematic diagram.
Component label instructions
11 first order AC-DC constant voltage output modules
12 second level tunable optical DC-DC modules
13 loads
14 switching tubes
15 chips
21 control chips
211 builtin voltage modules
212 constant-current control modules
2121 current setting unit settings
2122 first control operational amplifiers
213 voltage control modules
2131 voltage setup units
2132 second control amplifiers
214 light-adjusting modules
215 main control modules
22 voltage input modules
221 alternating voltages
222 rectification filtering units
2221 rectifier bridges
23 optical coupling modules
24 main circuits
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.
Please refer to fig. 4 to fig. 6.It should be noted that diagram provided in the present embodiment only illustrates this in a schematic way
The basic conception of invention, though only show in diagram with related component in the present invention rather than package count when according to actual implementation
Mesh, shape and size are drawn, when actual implementation kenel, quantity and the ratio of each component can arbitrarily change for one kind, and its
Assembly layout kenel may also be increasingly complex.
Embodiment one
Referring to Fig. 4, the present embodiment provides a kind of LED to drive light modulation feedback control circuit, the LED driving light modulation feedback
Control circuit includes: voltage input module (not shown), at least one control chip 21, first resistor R1, second resistance R2, third
Resistance R3, sampling resistor Rcs, first capacitor C1, the second capacitor C2, the first load LED1 and optical coupling module 23；The control core
Piece 21 includes builtin voltage module 211, constant-current control module 212, voltage control module 213 and light-adjusting module 214；The inside
211 one end of voltage module is electrically connected with the voltage input module, and the other end is grounded via the first capacitor C1, is suitable for generating
Chip interior voltage, and the externally output power supply after first capacitor C1 filtering；212 one end of constant-current control module warp
Be electrically connected by the first load pin LEDx with the first load LED1, the other end respectively with the first resistor R1 and described adopt
Sample resistance Rcs electrical connection, suitable for controlling the electric current of the first load LED1；Described 213 one end of voltage control module is connected to
Between the constant-current control module 212 and the first load LED1, the other end respectively with the second resistance R2 and described the
Three resistance R3 electrical connection is suitable for generating control voltage, and by the control voltage through the second resistance R2, second capacitor
As control signal output after C2 filtering；The light-adjusting module 214 is electrically connected with the constant-current control module 212, is suitable for institute
It states LED driving light modulation feedback control circuit and carries out simulation light modulation and PWM light modulation；The first resistor R1 is far from the current constant control
One end of module 212 and the sampling resistor Rcs are grounded far from one end of the constant-current control module 212, are suitable for described in setting
The output electric current of LED driving light modulation feedback control circuit；The 3rd resistor R3 is suitable in the first load pin LEDx of setting
Center value voltage；The second capacitor C2 one end and the 3rd resistor R3 far from the second resistance R2 are far from the voltage control
One end of molding block 213 is grounded；First load LED1 one end and the voltage far from the constant-current control module 212 is defeated
Enter module electrical connection；Described 23 one end of optical coupling module and the one end of the second resistance R2 far from the voltage control module 213
Electrical connection, the other end is connected between the builtin voltage module 211 and the first capacitor C1, suitable for the control that will be exported
Signal processed feeds back to the voltage input module, so that the voltage input module is defeated according to the adjustment of the control signal of feedback
Voltage HV out.
The presence of the first capacitor C1, so that the voltage HV that the control chip 21 is inputted in the voltage input module
Work is remained to when being 0, at this time detect HV voltage the detection of voltage switch may be implemented, thus realize voltage switch light modulation etc. other
Function.
As an example, the constant-current control module 212 includes: switching tube Q, current setting unit setting 2121 and the first control fortune
Calculate amplifier 2122；The switching tube Q includes grid, source electrode and drain electrode；The grid of the switching tube Q and first control are transported
It calculates amplifier 2122 to be electrically connected, the source electrode of the switching tube Q is electrically connected with the sampling resistor Rcs, the drain electrode of the switching tube Q
It is electrically connected with the first load LED1；Described 2121 one end of current setting unit setting and the first control operational amplifier 2122
Electrical connection, the other end are electrically connected with the first resistor R1, and the LED driving for being adapted to detect for the first resistor R1 setting is adjusted
The output electric current of light feedback control circuit；The first control operational amplifier 2122 includes first input end, the second input terminal
And output end；The first input end of the first control operational amplifier 2122 is electrically connected with the sampling resistor Rcs, and described the
Second input terminal of one control operational amplifier 2122 is electrically connected with the current setting unit setting 2121, the first control operation
The output end of amplifier 2122 is electrically connected with the grid of the switching tube Q, suitable for detect the current setting unit setting 2121
Output electric current is compared with the electric current for flowing through the sampling resistor Rcs, and is exported control signal according to comparison result and controlled institute
State the electric current of the first load LED1.
As an example, the switching tube Q can be PMOS tube or NMOS tube, it is preferable that in the present embodiment, the switching tube
Q is NMOS tube；NMOS tube has the advantages that conducting resistance is small, at low cost, easy to manufacture compared to PMOS tube.
As an example, the first input end of the first control operational amplifier 2122 is negative input end, the second input terminal
For positive input terminal.
As an example, the voltage control module 213 includes: voltage setup unit 2131 and the second control operational amplifier
2132；Described 2131 one end of voltage setup unit with it is described second control operational amplifier 2132 be electrically connected, the other end with it is described
3rd resistor R3 electrical connection is adapted to detect for the central value electricity of the first load pin LEDx of the 3rd resistor R3 setting
Pressure；The second control operational amplifier 2312 includes first input end, the second input terminal and output end；The second control fortune
The first input end for calculating amplifier 2312 is connected between the constant-current control module 212 and the first load LED1, specifically
, the first input end of the second control operational amplifier 2312 is connected to the drain electrode of the switching tube Q and described first negative
It carries between LED1, the second input terminal of the second control operational amplifier 2312 is electrically connected with the voltage setup unit 2131
It connects, the output end of the second control operational amplifier 2312 is electrically connected with the second resistance R2, suitable for the institute that will test
State the center threshold voltage of the first load pin LEDx of 3rd resistor R3 setting and the reality of the first load pin LEDx
Border center threshold voltage is compared, and according to one control voltage signal of comparison result output to the second resistance R2.
As an example, the first input end of the second control operational amplifier 2132 is negative input end, the second input terminal
For positive input terminal.
As an example, the optical coupling module 23 includes: the second load LED2 and the 4th resistance R4；The second load LED2
It is electrically connected with the 4th resistance R4, and second load LED2 one end and the voltage far from the 4th resistance R4 is defeated
Enter module electrical connection, the 4th resistance R4 is connected to the builtin voltage module far from one end of the second load LED2
Between 211 and the first capacitor C1.
As an example, the voltage input module includes AC power source and the rectifying and wave-filtering that is electrically connected with the AC power source
Unit.
As an example, the rectification filtering unit may include rectifier bridge and third capacitor C3, the rectifier bridge with it is described
AC power source electrical connection, described one end third capacitor C3 are electrically connected with the rectifier bridge, other end ground connection.The rectifier bridge includes
Two groups of diode groups in parallel, each diode group includes concatenated two diodes.The voltage of the AC power source output is positive
String voltage.
As an example, the quantity of the control chip 21 can be multiple, multiple 21 parallel outputs of control chip.It is more
A 21 parallel output of control chip, can be improved output electric current, the application suitable for High Output Current.
Referring to Fig. 5, Fig. 5 is the working timing figure of LED driving light modulation feedback control circuit, it is as shown in Figure 5, described
The voltage HV (Hvin in corresponding diagram 5) of voltage input module output is the output voltage waveforms containing working frequency ripple wave, power frequency line
The ripple amplitude of wave is Vpp.VLED is the voltage at first load both ends LED1, therefore, the first load pin LEDx
Voltage be also the voltage containing working frequency ripple wave, ripple voltage amplitude is consistent with the ripple amplitude of HV.LEDx_min is described
The minimum voltage that can be worked normally when switching tube Q current constant control, the 3rd resistor R3 set the first load pin LEDx
The central value Vset of ripple voltage, in order to guarantee the function of ripple, first load pipe of the 3rd resistor R3 setting
The central value Vset of foot LEDx ripple voltage should meet: Vset-0.5Vpp > LEDx_min, at this point, output electric current Iout passes through
The adjustment of the switching tube Q is just a direct current, eliminates working frequency ripple wave.The control voltage that the voltage control module 213 exports
(OUT control in corresponding diagram 5) is also one after the second resistance R2 and the second capacitor C2 filtering and contains power frequency
The voltage of ripple, but the working frequency ripple wave voltage very little, feed back to the voltage input mould by the optical coupling module 23
The voltage of the voltage input module output is controlled after block.
If HV voltage entire lowering, LEDx voltage can also decline, after practical center threshold voltage is lower than setting value Vset, institute
The output voltage (OUT) of entire circuit can be improved by stating the second control amplifier 2132, to feed back to the voltage input mould
Block exports more energy, improves HV voltage.If HV voltage rises overally, LEDx voltage can be risen with it, virtual center value electricity
Pressure can be higher than setting value Vset, and the second control amplifier 2132 will reduce the output voltage of entire circuit, to feed back
Primary reduces output energy, therefore HV voltage will decline.Therefore the LED driving light modulation feedback control circuit can be dynamic
LEDx voltage is maintained, efficiency will not be reduced because of LEDx overtension, will not cause to export current reduction production because of brownout
Raw ripple causes to flash.
Since HV is there are ripple voltage Vpp, the control chip 21 for removing ripple can undertake some power losses, therefore
, can be used in parallel by multiple control chips 21 in the application of High-current output, share power loss.
The light-adjusting module 214 receives dim signal when carrying out simulation light modulation, and the current constant control point of the switching tube Q can be with
Receive the control of the light-adjusting module 214, and guarantee LEDx voltage in setting value, to realize closed loop feedback.
The light-adjusting module 214 receives dim signal when carrying out PWM light modulation, when light modulation is opened described in the second control amplifier
2132 be normal output, when light modulation is closed described in the second control output of amplifier 2132 be it is low, due to there is the second resistance R2
And the filtering of the second capacitor C2, OUT voltage can be filtered into a DC voltage lower than normal value, the voltage input mould
Block provides the energy fewer than normal value would not generate audio-frequency noise due to being DC feedback voltage at this time.Due to the light modulation
The control response of module 214 is very quick, therefore dimming depth can be relatively high, is easily able to 1%.
Embodiment two
Referring to Fig. 6, the present invention also provides a kind of LED to drive light modulation feedback control circuit, the LED driving light modulation feedback
Control circuit include: voltage input module 22, at least one control chip 21, main circuit 24, first capacitor C1, the second capacitor C2 and
Sampling resistor Rcs；The control chip 21 includes builtin voltage module 211, constant-current control module 212, voltage control module
213, main control module 215 and light-adjusting module 214；22 electricity of described 211 one end of builtin voltage module and the voltage input module
Connection, the other end are grounded via the first capacitor C1, are suitable for generating chip interior voltage, and filter by the first capacitor C1
Externally output power supply after wave；Described 212 one end of constant-current control module is electrically connected via load pin LEDx with the main circuit 24,
The other end is grounded via the sampling resistor Rcs, suitable for controlling the electric current of the main circuit 24；The voltage control module 213
One end is connected between the constant-current control module 212 and the main circuit 24, and the other end is grounded via the second capacitor C2,
Voltage is controlled suitable for generating, and the control voltage is used as to control signal output after the second capacitor C2 filtering；It is described
Light-adjusting module 214 is electrically connected with the constant-current control module 212, is suitable for driving light modulation feedback control circuit to carry out the LED
Simulation light modulation and PWM light modulation；Described 215 one end of main control module is electrically connected with the main circuit 24, and the other end is connected to described
Between voltage control module 213 and the second capacitor C2；The input terminal of the main circuit 24 and the voltage input module 22
Electrical connection, output end are electrically connected with the main control module 215 and the constant-current control module 212.
As an example, the constant-current control module 212 includes: first switch tube Q1, current setting unit setting 2121 and first
Control operational amplifier 2122；The first switch tube Q1 includes grid, source electrode and drain electrode；The grid of the first switch tube Q1
It is electrically connected with the first control operational amplifier 2122, the source electrode of the first switch tube Q1 and sampling resistor Rcs electricity
Connection, the described first drain electrode for opening the light pipe Q1 are electrically connected with the main circuit 24；The current setting unit setting 2121 and described the
One control operational amplifier 2122 is electrically connected, the output electric current of the LED driving light modulation feedback control circuit suitable for setting；Institute
Stating the first control operational amplifier 2122 includes first input end, the second input terminal and output end；The first control operation is put
The first input end of big device 2122 is electrically connected with the sampling resistor Rcs, and the second of the first control operational amplifier 2122
Input terminal is electrically connected with the current setting unit setting 2121, the output end and described the of the second control operational amplifier 2122
The grid electrical connection of one switching tube Q1, suitable for the output electric current for setting the current setting unit setting 2121 and flows through the sampling
The electric current of resistance Rcs is compared, and exports the electric current that control signal controls the main circuit 24 according to comparison result.
As an example, the first switch tube Q1 can be PMOS tube or NMOS tube, it is preferable that described in the present embodiment
First switch tube Q1 is NMOS tube；NMOS tube has the advantages that conducting resistance is small, at low cost, easy to manufacture compared to PMOS tube.
As an example, the first input end of the first control operational amplifier 2122 is negative input end, the second input terminal
For positive input terminal.
As an example, the voltage control module 213 includes: voltage setup unit 2131 and the second control operational amplifier
2132；The voltage setup unit 2131 is electrically connected with the second control operational amplifier 2132, suitable for the described negative of setting
Carry the center threshold voltage of pin LEDx；It is described second control operational amplifier 2132 include first input end, the second input terminal and
Output end；It is described second control operational amplifier 2132 first input end be connected to the constant-current control module 212 with it is described
Between main circuit 24, more specifically, the first input end of the second control operational amplifier 2132 is connected to described first
Between the drain electrode of switching tube Q1 and the main circuit 24, it is described second control operational amplifier 2132 the second input terminal with it is described
Voltage setup unit 2131 is electrically connected, the output end of the second control operational amplifier 2132 and the second capacitor C2 and institute
The electrical connection of main control module 215 is stated, suitable for the center for the load pin LEDx for setting the voltage setup unit 2131
Threshold voltage is compared with the practical center threshold voltage of the load pin LEDx, and according to one control voltage of comparison result output
Signal is to the second capacitor C2 and the main control module 215.
As an example, the first input end of the second control operational amplifier 2132 is negative input end, the second input terminal
For positive input terminal.
As an example, the voltage input module 22 includes AC power source 221 and is electrically connected with the AC power source 221
Rectification filtering unit 222.
As an example, the rectification filtering unit 222 may include rectifier bridge 2221 and third capacitor C3, the rectifier bridge
2221 are electrically connected with the AC power source 221, and described one end third capacitor C3 is electrically connected with the rectifier bridge 2221, another termination
Ground.The rectifier bridge 2221 includes two groups of diode groups in parallel, and each diode group includes concatenated two diodes.The friendship
The voltage that galvanic electricity source 221 exports is sinusoidal voltage.
As an example, the main circuit 24 includes: inductance L, sustained diode, load LED, second switch Q2, resistance
R and the 4th capacitor C4；The inductance L, the sustained diode and the load LED are sequentially connected, and the inductance L is separate
One end of the sustained diode is electrically connected with the voltage input module 22, and the load LED is far from the freewheeling diode
One end of D is electrically connected with the constant-current control module 212, and more specifically, the load LED is far from the sustained diode
One end be electrically connected with the drain electrode of the first switch tube Q1；The second switch Q2 includes grid, source electrode and drain electrode；It is described
The grid of second switch Q2 is electrically connected with the main control module 215, the source electrode of the second switch Q2 and the resistance R
Electrical connection, the drain electrode of the second switch Q2 are connected between the inductance L and the sustained diode；The resistance R is remote
One end ground connection from the second switch Q2；The one end the 4th capacitor C4 is connected to the sustained diode and bears with described
It carries between LED, other end ground connection.
In conclusion the present invention provides a kind of LED driving light modulation feedback control circuit, the LED driving light modulation feedback control
Circuit processed includes: voltage input module, at least one control chip, first resistor, second resistance, 3rd resistor, sampling resistor, the
One capacitor, the second capacitor, the first load and optical coupling module；The control chip include builtin voltage module, constant-current control module,
Voltage control module and light-adjusting module；Builtin voltage module one end is electrically connected with the voltage input module, other end warp
It is grounded by the first capacitor, is suitable for generating chip interior voltage, and the externally output power supply after first capacitor filtering；
Described constant-current control module one end is electrically connected via the first load pin with first load, and the other end is respectively with described first
Resistance and sampling resistor electrical connection, suitable for controlling the electric current of first load；Voltage control module one end connection
Between the constant-current control module and first load, the other end is electric with the second resistance and the 3rd resistor respectively
Connection is suitable for generating control voltage, and regard the control voltage as control after the second resistance, second capacitor filtering
Signal output processed；The light-adjusting module is electrically connected with the constant-current control module, is suitable for driving the LED light modulation feedback control
Circuit carries out simulation light modulation and PWM light modulation；The first resistor one end and sampling electricity far from the constant-current control module
It hinders one end far from the constant-current control module to be grounded, suitable for setting the output electricity of the LED driving light modulation feedback control circuit
Stream；The 3rd resistor is suitable for setting the center threshold voltage of the first load pin；Second capacitor is far from the second resistance
One end and the 3rd resistor far from the voltage control module one end be grounded；Described first loads far from the constant current control
One end of molding block is electrically connected with the voltage input module；Described optical coupling module one end and the second resistance are far from the electricity
One end electrical connection of control module is pressed, the other end is connected between the builtin voltage module and the first capacitor, and being suitable for will
The control signal of output feeds back to the voltage input module.The present invention has beneficial below by adding control chip
Effect: output electric current does not have the flashing of working frequency ripple wave without working frequency ripple wave；Light modulation is not necessarily to DC_DC module, and when PWM light modulation
Do not have audio-frequency noise；Light modulation depth can achieve 1%；The efficiency of entire control circuit is higher；Multiple control chip parallel connections are defeated
Out, output electric current can be improved, the application suitable for High Output Current.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention, for example, this
Invention can also use three epitaxial layers or more epitaxial layers.Any person skilled in the art all can be without prejudice to spirit of the invention
Under the scope of and, carry out modifications and changes to above-described embodiment.Therefore, such as those of ordinary skill in the art not
All equivalent modifications or change completed under disclosed spirit and technical idea are detached from, it should be by power of the invention
Benefit requires to be covered.
Claims (11)
1. a kind of LED driving light modulation feedback control circuit, which is characterized in that the LED driving dims feedback control circuit and includes:
Voltage input module, at least one control chip, first resistor, second resistance, 3rd resistor, sampling resistor, first capacitor, second
Capacitor, the first load and optical coupling module；
The control chip includes builtin voltage module, constant-current control module, voltage control module and light-adjusting module；The inside
Voltage module one end is electrically connected with the voltage input module, and the other end is grounded via the first capacitor, is suitable for generating chip
Builtin voltage, and the externally output power supply after first capacitor filtering；Described constant-current control module one end is negative via first
It carries pin to be electrically connected with first load, the other end is electrically connected with the first resistor and the sampling resistor respectively, is suitable for
Control the electric current of first load；Described voltage control module one end is connected to the constant-current control module and described first negative
Between load, the other end is electrically connected with the second resistance and the 3rd resistor respectively, is suitable for generating control voltage, and will be described
Voltage is controlled after the second resistance, second capacitor filtering as control signal output；The light-adjusting module with it is described
Constant-current control module electrical connection, suitable for driving to the LED, light modulation feedback control circuit carries out simulation light modulation and PWM is dimmed；
The first resistor one end and the sampling resistor far from the constant-current control module are far from the constant-current control module
One end ground connection, suitable for setting the output electric current of LED driving light modulation feedback control circuit；
The 3rd resistor is suitable for setting the center threshold voltage of the first load pin；
Second capacitor one end and the 3rd resistor far from the second resistance far from the voltage control module one
End ground connection；
Described first loads one end far from the constant-current control module is electrically connected with the voltage input module；
Described optical coupling module one end is electrically connected with the second resistance far from one end of the voltage control module, other end connection
It is defeated suitable for the control signal of output is fed back to the voltage between the builtin voltage module and the first capacitor
Enter module.
2. LED driving light modulation feedback control circuit according to claim 1, it is characterised in that: the constant-current control module
It include: switching tube, current setting unit setting and the first control operational amplifier；
The switching tube includes grid, source electrode and drain electrode；The grid of the switching tube and the first control operational amplifier electricity
Connection, the source electrode of the switching tube are electrically connected with the sampling resistor, and the drain electrode of the switching tube is electrically connected with first load
It connects；
Described current setting unit setting one end is electrically connected with the first control operational amplifier, the other end and first resistor electricity
Connection is adapted to detect for the output electric current of the LED driving light modulation feedback control circuit of the first resistor setting；
The first control operational amplifier includes first input end, the second input terminal and output end；The first control operation
The first input end of amplifier is electrically connected with the sampling resistor, the second input terminal of the first control operational amplifier and institute
Current setting unit setting electrical connection is stated, the output end of the first control operational amplifier is electrically connected with the grid of the switching tube,
Output electric current suitable for detecting the current setting unit setting is compared with the electric current for flowing through the sampling resistor, and according to than
Relatively result output control signal controls the electric current of first load.
3. LED driving light modulation feedback control circuit according to claim 1, it is characterised in that: the voltage control module
It include: voltage setup unit and the second control operational amplifier；
Voltage setup unit one end is electrically connected with the second control operational amplifier, the other end and 3rd resistor electricity
Connection is adapted to detect for the center threshold voltage of first load pin of the 3rd resistor setting；
The second control operational amplifier includes first input end, the second input terminal and output end；The second control operation
The first input end of amplifier is connected between the constant-current control module and first load, and the second control operation is put
Second input terminal of big device is electrically connected with the voltage setup unit, described second control the output end of operational amplifier with it is described
Second resistance electrical connection, suitable for will test the 3rd resistor setting first load pin center threshold voltage with
The practical center threshold voltage of first load pin is compared, and according to one control voltage signal of comparison result output to institute
State second resistance.
4. LED according to claim 1 driving light modulation feedback control circuit, it is characterised in that: the optical coupling module includes
Second load and the 4th resistance；
Second load is electrically connected with the 4th resistance, and described second loads one end and institute far from the 4th resistance
Voltage input module electrical connection is stated, the 4th resistance is connected to the builtin voltage module far from one end of second load
Between the first capacitor.
5. LED driving light modulation feedback control circuit according to claim 1, it is characterised in that: the voltage input module
Including AC power source and the rectification filtering unit being electrically connected with the AC power source.
6. LED driving light modulation feedback control circuit according to claim 1, it is characterised in that: the number of the control chip
Amount is multiple, multiple control chip parallel outputs.
7. a kind of LED driving light modulation feedback control circuit, which is characterized in that the LED driving dims feedback control circuit and includes:
Voltage input module, at least one control chip, main circuit, first capacitor, the second capacitor and sampling resistor；
The control chip includes builtin voltage module, constant-current control module, voltage control module, main control module and light modulation mould
Block；Builtin voltage module one end is electrically connected with the voltage input module, and the other end is grounded via the first capacitor, is fitted
In generation chip interior voltage, and the externally output power supply after first capacitor filtering；Described constant-current control module one end
It is electrically connected via load pin with the main circuit, the other end is grounded via the sampling resistor, is suitable for controlling the main circuit
Electric current；Described voltage control module one end is connected between the constant-current control module and the main circuit, other end lease making
By second capacity earth, it is suitable for generating control voltage, and by control voltage conduct after second capacitor filtering
Control signal output；The light-adjusting module is electrically connected with the constant-current control module, is suitable for driving the LED light modulation feedback control
Circuit processed carries out simulation light modulation and PWM light modulation；
Described main control module one end is electrically connected with the main circuit, and the other end is connected to the voltage control module and described the
Between two capacitors；
The input terminal of the main circuit is electrically connected with the voltage input module, output end and the main control module and the perseverance
Flow control module electrical connection.
8. LED driving light modulation feedback control circuit according to claim 7, it is characterised in that: the constant-current control module
It include: first switch tube, current setting unit setting and the first control operational amplifier；
The first switch tube includes grid, source electrode and drain electrode；The grid of the first switch tube and the first control operation
Amplifier electrical connection, the source electrode of the first switch tube is electrically connected with the sampling resistor, the drain electrode of the first switch tube and
The main circuit electrical connection；
The current setting unit setting is electrically connected with the first control operational amplifier, and the LED suitable for setting drives light modulation
The output electric current of feedback control circuit；
The first control operational amplifier includes first input end, the second input terminal and output end；The first control operation
The first input end of amplifier is electrically connected with the sampling resistor, the second input terminal of the first control operational amplifier and institute
Current setting unit setting electrical connection is stated, the output end of the first control operational amplifier and the grid of the first switch tube are electrically connected
It connects, the output electric current suitable for setting the current setting unit setting is compared with the electric current for flowing through the sampling resistor, and root
The electric current that control signal controls the main circuit is exported according to comparison result.
9. LED driving light modulation feedback control circuit according to claim 7, it is characterised in that: the voltage control module
It include: voltage setup unit and the second control operational amplifier；
The voltage setup unit is electrically connected with the second control operational amplifier, suitable in the load pin of setting
Center value voltage；
The second control operational amplifier includes first input end, the second input terminal and output end；The second control operation
The first input end of amplifier is connected between the constant-current control module and the main circuit, the second control operation amplifier
Second input terminal of device is electrically connected with the voltage setup unit, the output end and described the of the second control operational amplifier
Two capacitors and main control module electrical connection, suitable for the central value for the load pin for setting the voltage setup unit
Voltage is compared with the practical center threshold voltage of the load pin, and extremely according to one control voltage signal of comparison result output
Second capacitor and the main control module.
10. LED driving light modulation feedback control circuit according to claim 7, it is characterised in that: the voltage input module
Including AC power source and the rectification filtering unit being electrically connected with the AC power source.
11. LED according to claim 7 driving light modulation feedback control circuit, it is characterised in that: the main circuit includes:
Inductance, freewheeling diode, load, second switch, resistance and the 4th capacitor；
The inductance, the freewheeling diode and the load are sequentially connected, and the inductance is far from the freewheeling diode
One end is electrically connected with the voltage input module, described one end loaded far from the freewheeling diode and the current constant control mould
Block electrical connection；
The second switch includes grid, source electrode and drain electrode；The grid of the second switch and main control module electricity
Connection, the source electrode of the second switch are electrically connected with the resistance, and the drain electrode of the second switch is connected to the inductance
Between the freewheeling diode；
The resistance is grounded far from one end of the second switch；
Described 4th capacitor one end is connected between the freewheeling diode and the load, other end ground connection.
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| CN201610178558.8A CN107231719B (en) | 2016-03-25 | 2016-03-25 | LED driving light modulation feedback control circuit |
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| CN201610178558.8A CN107231719B (en) | 2016-03-25 | 2016-03-25 | LED driving light modulation feedback control circuit |
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| ES2970065T3 (en) | 2018-08-17 | 2024-05-24 | Signify Holding Bv | LED drive circuit |
| CN110691445B (en) * | 2019-09-05 | 2021-09-14 | 西安电子科技大学 | Multi-path high-power LED drive circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102960070A (en) * | 2010-07-01 | 2013-03-06 | 夏普株式会社 | LED control device and liquid crystal display apparatus |
| CN105188232A (en) * | 2015-10-23 | 2015-12-23 | 深圳市奇脉电子技术有限公司 | LED (light-emitting diode) constant-current drive circuit, constant-current dimming circuit and control method of LED (light-emitting diode) constant-current dimming circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101631409B (en) * | 2009-08-20 | 2013-01-16 | 英飞特电子（杭州）股份有限公司 | Pulse-width modulation (PWM) light-adjusting circuit for light-emitting diode (LED) |
| US8686654B2 (en) * | 2011-12-14 | 2014-04-01 | Maxim Integrated Products, Inc. | Efficiency regulation for LED illumination |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102960070A (en) * | 2010-07-01 | 2013-03-06 | 夏普株式会社 | LED control device and liquid crystal display apparatus |
| CN105188232A (en) * | 2015-10-23 | 2015-12-23 | 深圳市奇脉电子技术有限公司 | LED (light-emitting diode) constant-current drive circuit, constant-current dimming circuit and control method of LED (light-emitting diode) constant-current dimming circuit |
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