CN206481476U - Controller, chip and LED drive system - Google Patents
Controller, chip and LED drive system Download PDFInfo
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- CN206481476U CN206481476U CN201720121277.9U CN201720121277U CN206481476U CN 206481476 U CN206481476 U CN 206481476U CN 201720121277 U CN201720121277 U CN 201720121277U CN 206481476 U CN206481476 U CN 206481476U
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Abstract
The utility model provides a kind of controller, chip and LED drive system, the output end and the first sampling resistor of controller electrical connection LED load, the controller is configured as the voltage and the voltage at the first sampling resistor two ends of the output end of sampling LED load, and generates first voltage signal according to the voltage of output end and the voltage at the first sampling resistor two ends of the LED load；The controller is used for the conducting state for the power tube that control is electrically connected with the LED load according to the first voltage signal and the voltage at the first sampling resistor two ends generation control signal, so that the voltage swing of the first voltage signal is equal with reference voltage, the current ripples of the LED load are eliminated.Whole process of the utility model in dimming process eliminates LED current ripple, it is to avoid the LED flickers that low-frequency jitter triggers.
Description
Technical field
The utility model is related to a kind of constant current drive control field, more particularly to a kind of to be used to eliminate LED drive system
Controller, chip and the LED drive system of current ripples.
Background technology
As LED is in the overall application of lighting field, efficient APFC (Active Power Factor
Correction, APFC) driver, controllable silicon light modulation or high PF (Power Factor, power factor)
Linear actuator obtained substantial amounts of use.Prime uses the Linear Driving of APFC drivers, controllable silicon light modulation or high PF
100hz/120hz working frequency ripple wave composition can be included in device, its output current.Due to the presence of these ripple components so that LED
Corresponding fluctuation also occurs in the brightness of light source.With the development of Lighting Industry, people propose higher to the quality of LED/light source
Requirement, do not dodge frequency, non-jitter turn into current high performance lED illuminate driving new demand, therefore, how to eliminate LED current line
Ripple turns into LED drive controls field emphasis of interest.
Elimination LED current is added in the output stage of the Linear actuator of APFC drivers, controllable silicon light modulation or high PF
Ripple chip, the power current ripple that can produce prime is significantly decayed, and obtains the LED drive current of approximate DC, significantly
The quality for improving light source.
At present, eliminating LED current ripple chip mainly has two schemes：
The first scheme：As shown in figure 1, operational amplifier A 2 as one buffering (buffer) circuit, by front stage every
From, and make it that the input and output voltage of buffer circuit is equal, i.e. VCOMPBUF=VCOMP.The output voltage V of buffer circuitCOMPBUFThrough
Cross after divider resistance R3 and R4 partial pressure, input operational amplifier A1 positive input terminal.Operational amplifier A 1 and metal-oxide-semiconductor M0 and resistance
R0 constitutes a voltage current adapter, produces LED driving current ILED,Buffering electricity
The input node DRAIN on road voltage VDRAINWith reference voltage VREFCompare in comparator CMP：Work as VDRAIN<VREFWhen, switch
S1 is closed, and node COMP electric capacity C1 is discharged by current source I2, node COMP voltage VCOMPGradually reduce, so that progressively
Reduce the electric current I for flowing through LEDLED, VDRAINIt will be stepped up；Work as VDRAIN>VREFWhen, switch S1 disconnects, by current source I1 to section
Point COMP electric capacity C1 chargings, node COMP voltage VCOMPIt is stepped up, so as to incrementally increase the electric current I for flowing through LEDLED, make
Obtain VDRAINGradually reduce.Thus, it is possible to by input node DRAIN voltage VDRAINControl in a relatively reasonable scope,
The decay to prime input current ripple is realized simultaneously.But, due in each power frequency period, electric capacity C1 be constantly present charging and
The process of electric discharge, thus forms certain voltage ripple in COMP pins, the amplitude of the voltage ripple by C1 electric capacity size
Determined with current source I1, I2 size.The factors such as realization and cost based on circuit, the voltage ripple amplitude of COMP pins is about
Tens millivolts, the fluctuating range of the voltage determines that the framework can not realize elimination LED in the case where input current is smaller
The function of current ripples, i.e., can not realize the whole elimination ripple function in LED dimming process.
Second scheme：As shown in Fig. 2 operational amplifier A 2 as one buffering (buffer) circuit, by front stage every
From, and make it that the input and output voltage of buffer circuit is equal, i.e. VCOMPBUF=VCOMP.The output voltage V of buffer circuitCOMPBUFThrough
Cross after divider resistance R3 and R4 partial pressure, input operational amplifier A1 positive input terminal.Operational amplifier A 1 and metal-oxide-semiconductor M0 and resistance
R0 constitutes a voltage current adapter, produces LED driving current ILED,Computing is put
Big device A1 output voltage VGATEWith reference voltage VREFCompare in comparator CMP：Work as VGATE>VREFWhen, switch S1 closures are led to
Overcurrent source I2 discharges node COMP electric capacity C1, node COMP voltage VCOMPGradually reduce, progressively reduce and flow through LED's
Electric current ILED, make A1 output voltage VGATEGradually reduce；Work as VGATE<VREFWhen, switch S1 disconnects, by current source I1 to node
COMP electric capacity C1 chargings, node COMP voltage VCOMPIt is stepped up, that is, incrementally increases the electric current I for flowing through LEDLED, make VGATE
It is stepped up.Hereby it is achieved that the decay to prime input current ripple.Similarly, due in each power frequency period, electric capacity C1
The process of charging and discharging is constantly present, certain ripple voltage, the amplitude of the ripple voltage are thus formed in COMP pins
Determined by the size of C1 electric capacity and current source I1, I2 size.The factors such as realization and cost based on circuit, COMP pins
About tens millivolts of ripple voltage amplitude, the fluctuating range of the voltage determines that the framework can not be in the smaller situation of input current
The lower function of realizing the LED current ripple that disappears, i.e., can not realize the whole elimination ripple function in dimming process.
Utility model content
The shortcoming of prior art in view of the above, the purpose of this utility model be to provide a kind of controller, chip and
LED drive system and the method for eliminating LED drive system current ripples, for solving dimming process in the prior art in LED
In, it is impossible to the problem of realizing whole elimination ripple.
In order to achieve the above objects and other related objects, the utility model provides a kind of for eliminating LED drive system electricity
The controller of flow liner ripple, the output end and the first sampling resistor of the controller electrical connection LED load, the controller is configured
For the voltage and the voltage at the first sampling resistor two ends of the output end for LED load of sampling, and according to the output end of the LED load
Voltage and the first sampling resistor two ends voltage generation first voltage signal；The controller is according to the first voltage
Signal and the voltage at the first sampling resistor two ends generation control signal are used for the power for controlling to electrically connect with the LED load
The conducting state of pipe so that the voltage swing of the first voltage signal is equal with reference voltage, eliminates the electricity of the LED load
Flow liner ripple.
In an embodiment of the present utility model, the controller includes：Sampling module and control module；The sampling mould
Block is used for the sample output end voltage of the LED load and the voltage at the first sampling resistor two ends, and negative according to the LED
The voltage of output end is carried to generate first voltage signal with the voltage at the first sampling resistor two ends and export to the control mould
Block；The control module is electrically connected to the output end of the sampling module, for receiving the first voltage signal, and according to institute
State control signal described in first voltage signal generation.
In an embodiment of the present utility model, the sampling module includes first resistor and second resistance；Wherein, it is described
First resistor is connected with the second resistance, and the other end of the first resistor electrically connects the output end of the LED load, described
The other end of second resistance electrically connects one end of first sampling resistor.
In an embodiment of the present utility model, the control module include trsanscondutance amplifier, electric capacity, partial pressure submodule and
Control submodule；The positive input terminal of the trsanscondutance amplifier electrically connects the first resistor and described second of the sampling module
The tie point of resistance, for receiving the first voltage signal, negative input end electrically connects reference voltage, and according to the described first electricity
Signal and the reference voltage is pressed to generate the first current signal；One end of first electric capacity electrically connects the trsanscondutance amplifier
Output end, other end ground connection；The partial pressure submodule is electrically connected to the output end of the trsanscondutance amplifier, for according to described
The voltage generation second voltage signal at one electric capacity two ends；The control submodule is electrically connected to the output end of the partial pressure submodule
With first sampling resistor, and according to the second voltage signal and the voltage at the first sampling resistor two ends generation described in
Control signal is exported to the control pole of the power tube.
In an embodiment of the present utility model, the control module also includes buffering submodule, the buffering submodule
Input be electrically connected to the output end of the trsanscondutance amplifier, output end is electrically connected to the input of the partial pressure submodule,
For realizing the buffering between the trsanscondutance amplifier and the partial pressure submodule.
In an embodiment of the present utility model, the buffering submodule is the first operational amplifier；First computing
The positive input terminal of amplifier is electrically connected to the output end of the trsanscondutance amplifier, and negative input end is electrically connected with output end.
In an embodiment of the present utility model, the partial pressure submodule includes 3rd resistor and the 4th resistance；Described
Three resistance and the 4th resistant series, the other end of the 3rd resistor electrically connect the output end of the trsanscondutance amplifier, institute
State the other end ground connection of the 4th resistance；The control submodule is electrically connected to the connection of the 3rd resistor and the 4th resistance
Point, for receiving the second voltage signal.
In an embodiment of the present utility model, the control submodule includes the second operational amplifier；Second fortune
The positive input terminal for calculating amplifier is electrically connected to the tie point of the 3rd resistor and the 4th resistance, for receiving described second
Voltage signal；Negative input end is electrically connected to first sampling resistor, according to the second voltage signal and the described first sampling
The voltage at resistance two ends generates the control signal, and exports to the control pole of the power tube.
In an embodiment of the present utility model, the output end voltage of the LED load and first sampling resistor two
The voltage at end is inversely proportional.
In an embodiment of the present utility model, the discharge and recharge of first electric capacity is exported by the trsanscondutance amplifier
First current signal realize.
In an embodiment of the present utility model, second operational amplifier, the power tube and first sampling
Resistance constitutes a voltage to the converter of electric current, the driving current for generating the LED load.
In an embodiment of the present utility model, pass through the mutual conductance for changing the trsanscondutance amplifier and/or first electricity
The capacitance of appearance, is changed the time constant eliminated needed for the LED load current ripples, is drawn with the input current for eliminating different frequency
The current ripples risen.
In an embodiment of the present utility model, pass through the mutual conductance for adjusting the trsanscondutance amplifier and/or first electricity
The capacitance of appearance, increase eliminates the time constant needed for low-frequency jitter, so as to remove low-frequency jitter.
It is used to eliminate the current ripples chip of LED drive system the invention also discloses a kind of, including it is as described above
Controller.
It is used to eliminate the current ripples chip of LED drive system the invention also discloses a kind of, including it is as described above
Controller, the power tube and first sampling resistor.
The invention also discloses a kind of LED drive system, including LED driver, LED load, control as described above
Device processed, wherein, the LED driver is used to generate the electric current for driving the LED load according to alternating voltage, and exports to described
LED load；The controller is electrically connected to the output end of the LED load, the electric current line for eliminating the driving LED load
Ripple or low-frequency jitter.
The invention also discloses a kind of method for eliminating LED drive system current ripples, using as described above
Controller, comprise the following steps：The voltage of the output end of the controller sampling LED load and the described first sampling electricity
The voltage at two ends is hindered, and is generated according to the voltage of output end and the voltage at the first sampling resistor two ends of the LED load
First voltage signal；The controller is according to the first voltage signal and the generation control of the voltage at the first sampling resistor two ends
Signal processed, for the conducting state for the power tube for controlling to electrically connect with the LED load so that the electricity of the first voltage signal
Press size equal with the reference voltage, eliminate the LED load current ripples.
The invention also discloses a kind of method for eliminating LED drive system current ripples, using as described above
Controller, comprise the following steps：The output end voltage of the sampling module sampling LED load and the first sampling electricity
The voltage at two ends is hindered, and is generated according to the voltage of output end and the voltage at the first sampling resistor two ends of the LED load
First voltage signal is simultaneously exported to the trsanscondutance amplifier；The trsanscondutance amplifier is according to the first voltage signal and the ginseng
Examine voltage and generate the first current signal；First electric capacity carries out discharge and recharge according to first current signal；Partial pressure
Module generates second voltage signal according to the voltage at the first electric capacity two ends；The control submodule is according to the second voltage
Signal and the voltage at the first sampling resistor two ends generate the control signal, and export to the control pole of the power tube.
In an embodiment of the present utility model, pass through the mutual conductance for changing the trsanscondutance amplifier and/or first electricity
The capacitance of appearance, changes the time constant needed for the current ripples for eliminating the LED load, to eliminate the input current of different frequency
Caused current ripples.
In an embodiment of the present utility model, pass through the mutual conductance for adjusting the trsanscondutance amplifier and/or first electricity
The capacitance of appearance, increase eliminates the time constant needed for low-frequency jitter, so as to remove low-frequency jitter.
As described above, a kind of controller of the present utility model, chip, LED drive system and for eliminating LED drive system
The method of current ripples, based on the dimming driver of existing elimination LED current ripple, is eliminated for in buffer circuit
Electric capacity carries out the current source of discharge and recharge, and controller, controller generation first are added between LED load and the first sampling resistor
Voltage signal, and the voltage at the first sampling resistor two ends for passing through first voltage signal generates conducting shape for controlling power tube
The control signal of state so that the voltage of first voltage signal is equal with reference voltage, so as to eliminate the electric current line of LED load
Ripple.In addition, the utility model also replaces traditional comparator with trsanscondutance amplifier, so that output voltage VCSIt is negative with LED unit
The voltage V of poleDRAINPressure difference between reference voltage is converted to electric current, to carry out discharge and recharge to the first electric capacity, realizes tune
The whole current ripples for eliminating LED load in photoreduction process；Also, capacitance of the utility model also by adjusting the first electric capacity
And/or the mutual conductance of trsanscondutance amplifier, increase time constant, so as to eliminate the shake of the low frequency less than 100hz, further avoid
The flicker problem for the LED that low-frequency jitter is triggered.It is of the present utility model simple in construction, it is with low cost, effectively increase LED work
Make efficiency.
Brief description of the drawings
Fig. 1 is shown as eliminating the electrical block diagram of the dimming driver of LED current ripple in the prior art.
Fig. 2 is shown as the electrical block diagram of another dimming driver for eliminating LED current ripple in the prior art.
Fig. 3 is shown as a kind of control for being used to eliminate LED drive system current ripples disclosed in the utility model embodiment
The theory structure schematic diagram of device processed.
Fig. 4 is shown as a kind of control for being used to eliminate LED drive system current ripples disclosed in the utility model embodiment
The electrical block diagram of device processed.
Component label instructions
100 controllers
110 sampling modules
120 control modules
121 partial pressure submodules
122 control submodules
123 buffering submodules
200 LED loads
Embodiment
Illustrate embodiment of the present utility model below by way of specific instantiation, those skilled in the art can be by this theory
Content disclosed by bright book understands other advantages of the present utility model and effect easily.The utility model can also be by addition
Different embodiments are embodied or practiced, and the various details in this specification can also be based on different viewpoints with answering
With, without departing from it is of the present utility model spirit under carry out various modifications or alterations.It should be noted that, in situation about not conflicting
Under, the feature in following examples and embodiment can be mutually combined.
Refer to accompanying drawing.It should be noted that the diagram provided in following examples only illustrates this reality in a schematic way
With new basic conception, the only display component relevant with the utility model rather than according to group during actual implement in schema then
Number of packages mesh, shape and size are drawn, and kenel, quantity and the ratio of each component can be a kind of random change during its actual implementation,
And its assembly layout kenel may also be increasingly complex.
A kind of controller of the present utility model, chip, LED drive system and for eliminating LED drive system current ripples
Method, a controller is electrically connected between the output end and the first sampling resistor of LED load, for generating first voltage signal
And the control signal of the conducting state of generation control power tube so that the voltage swing of first voltage signal and reference voltage phase
Deng eliminating LED load current ripples.
Embodiment 1
Present embodiment discloses a kind of controller for eliminating LED drive system current ripples, MOS is used with power tube below
Illustrated exemplified by pipe, in other implementations, power tube can also be triode or other kinds of power tube.As schemed
Shown in 3, controller 100 is electrically connected with the output end and the first sampling resistor R0 of LED load 200.Controller 100 is used to sample
The voltage V of the output end of LED load 200DRAINWith the voltage V at the first sampling resistor R0 two endsCS, also, according to LED load 200
Output end voltage VDRAINWith the voltage V at the first sampling resistor R0 two endsCSGenerate first voltage signal VDV1；Further,
Controller 100 is always according to first voltage signal VDV1With first voltage signal VDV1Generate corresponding control signal VGATE, pass through control
Signal V processedGATEControl power tube M0 conducting state so that first voltage signal VDV1Voltage swing and reference voltage VREFPhase
Deng so as to eliminate the current ripples of LED load.Wherein, LED drive system includes but is not limited to LED load 200, first adopted
Sample resistance R0, power tube M0, current source I0 and C0.In addition, power tube M0 drain electrode is connected with the output end of LED load 200；Source
Pole is connected with the first sampling resistor R0 one end.
Preferably, as shown in figure 3, controller 100 is realized by sampling module 110 and control module 120, wherein, adopt
Voltage V of the egf block 110 for the output end for LED load 200 of samplingDRAINWith the voltage V at the first sampling resistor R0 two endsCS, and
And, according to the voltage V of the output end of LED load 200DRAINWith the voltage V at the first sampling resistor R0 two endsCSGenerate first voltage
Signal VDV1, and export to control module 120.
Preferably, as shown in figure 4, sampling module 110 includes first resistor R1 and second resistance R2；The one of first resistor R1
The drain electrode respectively with the output end and power tube M0 of LED load 200 is held to be connected, the other end is connected with second resistance R2 one end；
The second resistance R2 other end is connected with the first sampling resistor R0 of sampling；First resistor R1 and second resistance R2 tie point S1 makees
For the output end of sampling module 110, it is connected with the input of control module 120.First resistor R1 and second resistance R2 group compositions
Press collector：The voltage V of the output end of first resistor R1 collection LED loads 200DRAIN, second resistance R2 collections the first sampling electricity
Hinder the voltage V at R0 two endsCS。
Control module 120 is used to receive first voltage signal VDV1, and according to first voltage signal VDV1Generate control signal
VGATE；And export to the control pole of power tube M0 grid, i.e. power tube.
As shown in figure 4, control module 120 includes：Trsanscondutance amplifier OTA1, the first electric capacity C1, partial pressure submodule 121 and control
System module 122.Wherein,
Trsanscondutance amplifier OTA1 positive input terminal and the output end of sampling module 110, i.e. first resistor R1 and second resistance
R2 tie point S-phase connects；Negative input end connection reference voltage VREF, for by the first voltage signal V of positive input terminalDV1It is defeated with bearing
Enter the reference voltage V at endREFBetween pressure difference be converted into electric current, generate the first current signal.
First electric capacity C1 one end is connected with trsanscondutance amplifier OTA1 output end, other end ground connection；
One end of partial pressure submodule 121 is connected with trsanscondutance amplifier OTA1 output end, for according to the first electric capacity C1 two
The voltage generation second voltage signal V at endCSREF.Preferably, as shown in figure 4, partial pressure submodule 121 includes but is not limited to the 3rd electricity
Hinder R3 and the 4th resistance R4.3rd resistor R3 one end is connected with trsanscondutance amplifier OTA1 output end, the other end and the 4th electricity
The one end for hindering R4 is connected；4th resistance R4 other end ground connection；3rd resistor R3 and the 4th resistance R4 tie point S2 as point
The output end of submodule 121 is pressed, is connected with the input of control submodule 122.Wherein, 3rd resistor R3 and the 4th resistance R4 makees
For divider resistance, by second voltage signal VCSREFInput to control submodule 122.
The first input end of control submodule 122 is connected with the output end of partial pressure submodule 121, the second output end respectively with
First sampling resistor R0 is connected with power tube M0 source electrode, and output end is connected with power tube M0 grid.Control submodule 122 is led to
Cross second voltage signal VCSREFWith the voltage V at the first sampling resistor R0 two endsCSGenerate corresponding control signal VGATE.Preferably,
As shown in figure 4, control submodule 122 uses the second operational amplifier A 2.The positive input terminal and partial pressure of second operational amplifier A 2
The output end of submodule 121 is connected；That is the positive input terminal of the second operational amplifier A 2 is connected to 3rd resistor R3 and the 4th resistance
R4 tie point S2；Negative input end is connected with the first sampling resistor R0, and output end is connected with power tube M0 grid.
Preferably, as shown in figure 4, control module 120 also includes a buffering submodule 123, it is connected to trsanscondutance amplifier
Between OTA1 and partial pressure submodule 121, for realizing the buffering between trsanscondutance amplifier OTA1 and partial pressure submodule 121.Wherein,
In the present embodiment, buffering submodule 123 is preferred to use the first operational amplifier A 1, the positive input terminal of the first operational amplifier A 1
It is connected with trsanscondutance amplifier OTA1 output end and the first electric capacity C1 one end；Negative input end is defeated with the first operational amplifier A 1
Go out end to be connected.
In the present embodiment, the divider of first resistor R1 and second resistance R2 compositions is used for the first sampling resistor R0 two that samples
The voltage V at endCSWith the voltage V of the output end of LED load 200DARIN, generation first voltage signal VDV1, and input to mutual conductance and put
Big device OTA1 positive input terminal, trsanscondutance amplifier OTA1 negative input termination reference voltage VREF.First reference voltage VDV1With ginseng
Examine voltage VREFPressure difference electric current is converted into by trsanscondutance amplifier OTA1, and the first electric capacity C1 at node COMP is filled
Electricity or electric discharge.First operational amplifier A 1 realizes a buffer circuit, makes VCOMPBUF=VCOMP, VCOMPBUFBy 3rd resistor R3
Second voltage signal V is obtained with after the 4th resistance R4 partial pressureCSREF, input to the positive input terminal of the second operational amplifier A 2.The
Two operational amplifier As 2 realize voltage to the conversion of electric current with metal-oxide-semiconductor M0, the first sampling resistor R0, produce LED load 200
Driving current ILED, i.e.The voltage V of the output end of LED load 200DRAINWith the first sampling
The V at resistance R0 two endsCSBetween relation be：Wherein, reference voltage VREFIt is solid
Fixed constant, therefore, the voltage V at the first sampling resistor R0 two endsCSWith the voltage V of the output end of LED load 200DRAINIt is anti-
Than relation, i.e. VCSBecome big, VDRAINDiminish.Also, the voltage at the first sampling resistor R0 two ends meets VCS=ILED*R0.Therefore,
When the electric current increase of LED load 200, system can reduce VDRAINSo that the power consumption W=I of the chip in LED loadLED*VDARIN
Reduction, reduces the heating of chip, improves the efficiency of LED unit.
Further, when dimming angle very little (prime input current very little), the elimination LED current ripple of the present embodiment
Function it is still effective.Now, due to the first sampling resistor R0 two ends voltage VCSIt is relatively low, by adjusting LED load 200
The voltage V of output endDRAINSo that the voltage of trsanscondutance amplifier OTA1 positive input terminal, i.e. first voltage signal VDV1Maintain with
The reference voltage V of negative input endREFEqual situation, in this way, the loop for entirely eliminating ripple still can be with normal work.Pass through
So, the present embodiment realizes the whole process of LED current and goes ripple function.
In addition, the present embodiment passes through the V that will sampleDRAINWith VCSResult input to trsanscondutance amplifier OTA1 positive input terminals, ginseng
Examine voltage VREFInput to trsanscondutance amplifier OTA1 negative input end, the voltage difference of input is converted into electricity by trsanscondutance amplifier OTA1
Stream, carries out discharge and recharge to the first electric capacity C1, obtains the time constant that LED removes ripple and gone needed for low-frequency jitter.In this reality
Apply in example, by the design and/or the selection of the first electric capacity C1 capacitances of the mutual conductance (△ io/ △ vin) to trsanscondutance amplifier OTA1,
LED can be flexibly changed to remove ripple and go the effect of low-frequency jitter.When trsanscondutance amplifier OTA1 mutual conductance value is smaller, knot
Close the first electric capacity C1, it is possible to achieve larger time constant, reach that eliminate that the reason such as dimmer jitter causes low-frequency trembles
Dynamic function, it is to avoid the generation of the LED triggered due to low-frequency jitter flashing state.
Preferably, the controller of the present embodiment can both make a single chip, installed in LED load 200, first
Between sampling resistor R0 and power tube M0；It can also be engaged with LED load 200, the first sampling resistor R0 and power tube M0,
Common set makes a chip, to eliminate the current ripples of LED drive system.
In addition, will be with not solving the utility model in innovative part of the present utility model, the present embodiment in order to protrude
The technical problem relation proposed less close module is introduced, but this is not intended that in the present embodiment and other moulds are not present
Block.
It should be noted that the diagram provided in the present embodiment only illustrates basic structure of the present utility model in a schematic way
Think, then in schema only display with relevant component in the utility model rather than according to component count during actual implement, shape and
Size is drawn, and it is actual when implementing, and kenel, quantity and the ratio of each component can be a kind of random change, and its assembly layout type
State may also be increasingly complex.
Embodiment 2
Present embodiment discloses a kind of method for eliminating LED drive system current ripples, it uses the institute of embodiment 1 public
The controller opened：
First, voltage V of the controller using the output end of LED load 200 is utilizedDRAINWith the first sampling resistor R0 two ends
Voltage VCS, and the voltage V of the output end according to LED load 200DRAINWith the voltage V at the first sampling resistor R0 two endsCSGeneration the
One voltage signal VDV1；Controller is again according to first voltage signal VDV1With the voltage V at the first sampling resistor two endsCSGeneration control letter
Number VGATE, so as to control the power tube M0 conducting state being connected with LED load 200 so that first voltage signal VDV1Voltage
Size and reference voltage VREFIt is equal, realize the elimination of the current ripples of LED load 200.
Specifically, the output end voltage V of the sampling of sampling module 110 LED load 200DRAINWith the first sampling resistor R0 two ends
Voltage VCS, and the voltage V of the output end according to LED load 200DRAINWith the first sampling resistor R0 two ends VCSVoltage generation
First voltage signal VDV1And export to trsanscondutance amplifier OTA1；
Trsanscondutance amplifier OTA1 is according to first voltage signal VDV1With reference voltage VREFGenerate the first current signal；
First electric capacity C1 carries out discharge and recharge according to the first current signal；
Partial pressure submodule 121 generates second voltage signal V according to the voltage at the first electric capacity C1 two endsCSREF；
Control submodule 122 is according to second voltage signal VCSREFWith the voltage generation control letter at the first sampling resistor C1 two ends
Number VGATE, and export to power tube M0 grid.
In the present embodiment, the voltage V at the first sampling resistor R0 two endsCSWith the voltage of the output end of LED load 200
VDRAINInverse relation, i.e. VCSBecome big, VDRAINDiminish.Due to the voltage V at the first sampling resistor R0 two endsCSIt is relatively low, by adjusting
The voltage V of the output end of whole LED load 200DRAINSo that the voltage of trsanscondutance amplifier OTA1 positive input terminal, i.e. first voltage
Signal VDV1Maintain the reference voltage V with negative input endREFEqual situation, in this way, the loop for entirely eliminating ripple still may be used
With normal work, in this way, the whole process that the present embodiment realizes LED current goes ripple function.Also, by trsanscondutance amplifier
The design and/or the selection of the first electric capacity C1 capacitances of OTA1 mutual conductance (△ io/ △ vin), can flexibly change LED go ripple with
And go the effect of low-frequency jitter.When trsanscondutance amplifier OTA1 mutual conductance value is smaller, with reference to the first electric capacity C1, it is possible to achieve compared with
Big time constant, reach and eliminate low-frequency dither functions that the reason such as dimmer jitter is caused, it is to avoid because low frequency is trembled
The generation of the flashing state for the LED for moving and triggering.
In summary, a kind of controller, chip and side for being used to eliminate LED drive system current ripples of the present utility model
Method, based on the dimming driver of existing elimination LED current ripple, is eliminated for carrying out charge and discharge for the electric capacity in buffer circuit
The current source of electricity, adds controller between LED load and the first sampling resistor, and controller generates first voltage signal, and
The control letter of the conducting state for controlling power tube is generated by the voltage at the first sampling resistor two ends of first voltage signal
Number so that the voltage of first voltage signal is equal with reference voltage, so as to eliminate the current ripples of LED load.In addition, this reality
Traditional comparator is also replaced with trsanscondutance amplifier with new, so that output voltage VCSWith the voltage V of LED unit negative poleDRAIN
Pressure difference between reference voltage is converted to electric current, to carry out discharge and recharge to the first electric capacity, realizes complete in dimming process
Journey eliminates the current ripples of LED load；Also, the utility model is also amplified by the capacitance for adjusting the first electric capacity and/or mutual conductance
The mutual conductance of device, increases time constant, so as to eliminate the shake of the low frequency less than 100hz, further avoid low-frequency jitter and drawn
The LED of hair flicker problem.It is of the present utility model simple in construction, it is with low cost, effectively increase LED operating efficiency.So,
The utility model effectively overcomes various shortcoming of the prior art and has high industrial utilization.
Above-described embodiment only illustrative principle of the present utility model and its effect are new not for this practicality is limited
Type.Any person skilled in the art can all be carried out without prejudice under spirit and scope of the present utility model to above-described embodiment
Modifications and changes.Therefore, such as those of ordinary skill in the art without departing from the essence disclosed in the utility model
God and all equivalent modifications completed under technological thought or change, should be covered by claim of the present utility model.
Claims (16)
1. a kind of controller for being used to eliminate LED drive system current ripples, it is characterised in that
The output end and the first sampling resistor of the controller electrical connection LED load, the controller are configured as sampling LED and born
The voltage of the output end of load and the voltage at the first sampling resistor two ends, and the voltage according to the output end of the LED load and institute
State the voltage generation first voltage signal at the first sampling resistor two ends；
The controller is used according to the first voltage signal and the voltage at the first sampling resistor two ends generation control signal
The conducting state of power tube electrically connected in control with the LED load so that the voltage swing of the first voltage signal and
Reference voltage is equal, eliminates the current ripples of the LED load.
2. controller according to claim 1, it is characterised in that：The controller includes：Sampling module and control module；
The sampling module is used for the sample output end voltage of the LED load and the voltage at the first sampling resistor two ends,
And the voltage according to the LED load output end and the voltage at the first sampling resistor two ends generate first voltage signal and defeated
Go out to the control module；
The control module is electrically connected to the output end of the sampling module, for receiving the first voltage signal, and according to
Control signal described in the first voltage signal generation.
3. controller according to claim 2, it is characterised in that：The sampling module includes first resistor and the second electricity
Resistance；Wherein,
The first resistor is connected with the second resistance, and the other end of the first resistor electrically connects the defeated of the LED load
Go out end, the other end of the second resistance electrically connects one end of first sampling resistor.
4. controller according to claim 3, it is characterised in that：The control module includes trsanscondutance amplifier, electric capacity, divided
Press submodule and control submodule；
The positive input terminal of the trsanscondutance amplifier electrically connects the first resistor and the second resistance of the sampling module
Tie point, for receiving the first voltage signal, negative input end electrically connects reference voltage, and according to the first voltage signal
The first current signal is generated with the reference voltage；
One end of first electric capacity electrically connects the output end of the trsanscondutance amplifier, other end ground connection；
The partial pressure submodule is electrically connected to the output end of the trsanscondutance amplifier, for the electricity according to the first electric capacity two ends
Pressure generation second voltage signal；
The control submodule is electrically connected to the output end and first sampling resistor of the partial pressure submodule, and according to described
Second voltage signal and the voltage at the first sampling resistor two ends generate the control signal and exported to the control of the power tube
Pole processed.
5. controller according to claim 4, it is characterised in that：The control module also includes buffering submodule, described
The input of buffering submodule is electrically connected to the output end of the trsanscondutance amplifier, and output end is electrically connected to the partial pressure submodule
Input, for realizing the buffering between the trsanscondutance amplifier and the partial pressure submodule.
6. controller according to claim 5, it is characterised in that：The buffering submodule is the first operational amplifier；Institute
The positive input terminal for stating the first operational amplifier is electrically connected to the output end of the trsanscondutance amplifier, and negative input end is electrically connected with output end
Connect.
7. the controller according to claim 4 or 5, it is characterised in that：The partial pressure submodule includes 3rd resistor and the
Four resistance；
The 3rd resistor and the 4th resistant series, the other end of the 3rd resistor electrically connect the trsanscondutance amplifier
Output end, the other end ground connection of the 4th resistance；
The control submodule is electrically connected to the tie point of the 3rd resistor and the 4th resistance, for receiving described second
Voltage signal.
8. controller according to claim 7, it is characterised in that：The control submodule includes the second operational amplifier；
The positive input terminal of second operational amplifier is electrically connected to the tie point of the 3rd resistor and the 4th resistance, uses
In the reception second voltage signal；Negative input end is electrically connected to first sampling resistor, according to the second voltage signal
The control signal is generated with the voltage at the first sampling resistor two ends, and is exported to the control pole of the power tube.
9. controller according to claim 1, it is characterised in that：The output end voltage of the LED load and described first
The voltage at sampling resistor two ends is inversely proportional.
10. controller according to claim 4, it is characterised in that：The discharge and recharge of first electric capacity be by it is described across
Lead first current signal realization of amplifier output.
11. controller according to claim 8, it is characterised in that：Second operational amplifier, the power tube and institute
State the first sampling resistor and constitute a voltage to the converter of electric current, the driving current for generating the LED load.
12. controller according to claim 4, it is characterised in that：By change the trsanscondutance amplifier mutual conductance and/or
The capacitance of first electric capacity, changes the time constant eliminated needed for the LED load current ripples, to eliminate different frequency
Current ripples caused by input current.
13. controller according to claim 4, it is characterised in that：By adjust the trsanscondutance amplifier mutual conductance and/or
The capacitance of first electric capacity, increase eliminates the time constant needed for low-frequency jitter, so as to remove low-frequency jitter.
14. a kind of current ripples chip for being used to eliminate LED drive system, it is characterised in that：Including described in claim 1 or 4
Controller.
15. a kind of current ripples chip for being used to eliminate LED drive system, it is characterised in that：Including described in claim 1 or 4
Controller, the power tube and first sampling resistor.
16. a kind of LED drive system, it is characterised in that：Including any in LED driver, LED load, such as claim 1-13
Controller described in, wherein,
The LED driver is used to generate the electric current for driving the LED load according to alternating voltage, and exports negative to the LED
Carry；
The controller is electrically connected to the output end of the LED load, for eliminate it is described driving LED load current ripples or
Low-frequency jitter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720121277.9U CN206481476U (en) | 2017-02-09 | 2017-02-09 | Controller, chip and LED drive system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720121277.9U CN206481476U (en) | 2017-02-09 | 2017-02-09 | Controller, chip and LED drive system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206481476U true CN206481476U (en) | 2017-09-08 |
Family
ID=59748284
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720121277.9U Withdrawn - After Issue CN206481476U (en) | 2017-02-09 | 2017-02-09 | Controller, chip and LED drive system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206481476U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106879109A (en) * | 2017-02-09 | 2017-06-20 | 上海晶丰明源半导体股份有限公司 | Controller, chip and method for eliminating LED drive system current ripples |
-
2017
- 2017-02-09 CN CN201720121277.9U patent/CN206481476U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106879109A (en) * | 2017-02-09 | 2017-06-20 | 上海晶丰明源半导体股份有限公司 | Controller, chip and method for eliminating LED drive system current ripples |
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