CN109788600A - A kind of circuit for eliminating current ripples, system and method - Google Patents
A kind of circuit for eliminating current ripples, system and method Download PDFInfo
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- CN109788600A CN109788600A CN201711124999.0A CN201711124999A CN109788600A CN 109788600 A CN109788600 A CN 109788600A CN 201711124999 A CN201711124999 A CN 201711124999A CN 109788600 A CN109788600 A CN 109788600A
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Abstract
The present invention relates to a kind of circuits for eliminating current ripples, comprising: low-pass filter circuit and controllable transistor, which is characterized in that further include: negative-feedback circuit.Low-pass filter circuit is for ripple voltage to be filtered；Negative-feedback circuit obtains ripple-free voltage for filtered voltage to be further filtered；Controllable transistor generates ripple-free electric current according to ripple-free voltage.The present invention has been effectively eliminated using negative-feedback circuit and existing has gone ripple current problem present in ripple circuit, realize purpose of the LED light without stroboscopic, reduce visual impact of the stroboscopic to human eye, thus reach the visual impairment for reducing human eye and being generated by stroboscopic, have a dizzy spell, migraine the problems such as.
Description
Technical field
The present invention relates to the circuits for eliminating current ripples, more particularly, to AC/DC LED driving high-voltage linear triac light modulation
The circuit of the elimination current ripples of LED driving, the high PFC constant current driving of AC/DC single-stage, system and method.
Background technique
Studies have shown that the frequency when optical flare is lower, that is, when being lower than 100Hz, human eye can feel the flashing of light；Work as light
The frequency of flashing is at 100Hz or higher frequency, human eye although imperceptible flashing, but remains to cause visual system
Response.Currently, all there is frequency in the driving of AC/DC high-voltage linear triac dimming LED (Light Emitting Diode), the high PFC constant current drive scheme of AC/DC single-stage
It dodges, if such scheme is wanted to weaken stroboscopic, often to reduce High Power Factor and high cost as cost.
For having stroboscopic existing for the LED constant current control program of High Power Factor and cost problem, the prior art is proposed
It is a kind of simply to go ripple scheme (as depicted in figs. 1 and 2), use the discrete devices such as metal-oxide-semiconductor, resistance, capacitor to build one
It is a easily to remove ripple circuit.The ripple in electric current that the LED constant-current control circuit for having High Power Factor is exported, it is this
The ripple for exporting electric current can be reduced to certain range to weaken stroboscopic by method.
As shown in Figure 1, for a kind of existing elimination current ripples circuit diagram.
Removing ripple circuit is cascaded with LED light string, and the output as the driving of front end high power factor constant current LED is negative
It carries, the ripple current in LED light string can be removed in this way and change the parameter of front end constant current driver circuit for LED.Simply remove line
Wave circuit includes low-pass filter circuit and controllable transistor.What wherein controllable transistor was chosen is NMOS tube.But simply remove ripple
Circuit can not effectively eliminate circuit ripple, and output circuit also has ripple by a small margin.Flow through in the electric current of LED light due to
Also there is ripple, leads to stroboscopic occur, makes one optic nerve and have an impact.
As shown in Fig. 2, for another existing elimination current ripples circuit diagram.
As shown in figure 1 simply remove ripple circuit, wherein a variable resistance for going ripple circuit to also correspond in Fig. 2
Part, the voltage fluctuation on this variable resistance, the output voltage ripple for following front end LED constant current to drive, to make in LED light string
There is constant voltage, makes the electric current for the electric current ripple-free for flowing through LED.But ripple circuit is equally simply removed as shown in figure 1,
Output circuit also has ripple by a small margin.It flows through in the electric current of LED light due to also there being ripple, leads to stroboscopic occur, make one to regard
Feel that nerve has an impact.
But above two circuit is not good enough for the eradicating efficacy of current ripples, can not eliminate current ripples effectively to reach
Purpose of the LED without stroboscopic.
To sum up, existing simply to remove ripple circuit, Wu Fayou using what the discrete devices such as metal-oxide-semiconductor, resistance, capacitor were built
Current ripples are eliminated to achieve the purpose that LED without stroboscopic in effect ground.
Summary of the invention
The present invention for remove AC/DC high-voltage linear triacs (triac) dimming LED (Light Emitting Diode) driving,
Stroboscopic existing for the high PFC constant current drive scheme of AC/DC single-stage.Electric current is exported by detection, triode is added and makees negative-feedback, to reach
To ripple effect is gone well, realize without stroboscopic.
To achieve the above object, the present invention provides a kind of circuit for eliminating current ripples, low-pass filter circuit and controllable
Transistor, which is characterized in that further include: negative-feedback circuit.Low-pass filter circuit is for ripple voltage to be filtered；It is negative
Feed circuit obtains ripple-free voltage for filtered voltage to be further filtered；Controllable transistor is according to nothing
Ripple voltage generates ripple-free electric current.
Preferably, negative-feedback circuit includes: NPN triode and 3rd resistor R3.3rd resistor one end and NPN triode
Base stage connection；The 3rd resistor other end is connected with electrolytic capacitor cathode, and the second of the collector of NPN triode and controllable transistor
End is connected, and the base stage of NPN triode is connected with the third end of controllable transistor, and the emitter and output capacitance of NPN triode are negative
Extremely it is connected.
Preferably, controllable transistor, comprising: metal-oxide-semiconductor, triode or Darlington transistor.
Preferably, low-pass filter circuit, comprising: first resistor R1, second resistance R2 and first capacitor.First resistor R1 and
Second resistance R2 series connection, first capacitor C1 are in parallel with resistance R2 or including first resistor R1 and first capacitor；Or including steady
Pressure pipe and first capacitor.
Preferably, further includes: the 4th resistance, the 4th resistance one end are connected with the emitter of NPN triode, and the 4th resistance is another
One end is connected with output capacitance cathode.
Preferably, NPN triode is substituted with NMOS tube, amplifier or Darlington transistor.
Preferably, metal-oxide-semiconductor selects NMOS tube；The NMOS tube works in constant current area, the NMOS tube drain electrode, source electrode two
Hold voltage VDSIt is greater than the NMOS tube grid, source electrode both end voltage VGSWith threshold voltage VTHDifference, i.e.,
VDS> VGS-VTH。
The present invention also provides a kind of systems for eliminating current ripples, including any elimination current ripples among the above
Circuit and constant-current driven chip.The circuit for eliminating current ripples is connected with LED light string, by the electricity for eliminating current ripples
Road removes the ripple current in LED light string.
The present invention also provides a kind of methods for eliminating current ripples, comprising: the exchange that constant-current driven chip will have ripple
Electricity inputs to low-pass filter；The alternating current for having ripple is converted to the direct current with ripple by a small margin by low-pass filter circuit
Electricity inputs to controllable transistor；Direct current with ripple by a small margin eliminates ripple by negative-feedback circuit, and exports ripple-free
Direct current.
Preferably, metal-oxide-semiconductor selects NMOS tube；The NMOS tube works in constant current area, the NMOS tube drain electrode, source electrode two
Hold voltage VDSIt is greater than the NMOS tube grid, source electrode both end voltage VGSWith threshold voltage VTHDifference, i.e.,
VDS> VGS-VTH。
The present invention forms negative-feedback circuit, to eliminate the line in circuit by NPN triode and current sampling resistor R3
Wave electric current.It can effectively eliminate and existing go the problem of still remaining ripple current in ripple circuit.This circuit is for electric current line
The eradicating efficacy of wave is significant, can eliminate current ripples effectively to achieve the purpose that LED without stroboscopic.Stroboscopic is reduced to the view of human eye
Feel impact, thus reach reduce human eye generated by stroboscopic visual impairment, have a dizzy spell, migraine the problems such as.
Detailed description of the invention
Fig. 1 is that one kind of the prior art removes ripple electrical block diagram；
Fig. 2 is that the another kind of the prior art removes ripple electrical block diagram；
Fig. 3 is a kind of elimination current ripples electrical block diagram provided in an embodiment of the present invention；
Fig. 4 is another elimination current ripples electrical block diagram provided in an embodiment of the present invention；
Fig. 5 is another elimination current ripples electrical block diagram provided in an embodiment of the present invention.
Specific embodiment
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
Fig. 3 is a kind of elimination current ripples circuit diagram provided by the invention.As shown in figure 3, the circuit includes: low-pass filtering
Circuit, controllable transistor and negative-feedback circuit.Wherein, low-pass filter circuit is for ripple voltage to be filtered；It is negative anti-
Current feed circuit obtains ripple-free voltage for filtered voltage to be further filtered；Controllable transistor is according to nothing
Ripple voltage generates ripple-free electric current.
Wherein, controllable transistor can be metal-oxide-semiconductor, be also possible to triode or Darlington transistor.It is worth noting that, low pass
It includes: first resistor R1, second resistance R2 and first capacitor that filter circuit, which can be, and first resistor R1 and second resistance R2 go here and there
Connection, first capacitor C1 are in parallel with resistance R2.It is also possible to include first resistor R1 and first capacitor.It can also be including voltage-stabiliser tube
And first capacitor.The alternating current that alternating current has ripple is converted to the direct current of ripple-free by low-pass filter circuit.But after converting
Voltage still has the ripple of very little.The electric current with ripple for having the voltage of ripple to generate can give human eye band by LED light
Come tired.In the present embodiment, the ripple voltage with very little is carried out by pressure stabilizing by negative-feedback circuit, passes through negative-feedback tune
Section makes to eliminate ripple voltage, also eliminates the need for the ripple in electric current.
As shown in figure 4, being a kind of elimination current ripples circuit diagram provided in an embodiment of the present invention
One embodiment provides a kind of circuit for eliminating current ripples, comprising: NMOS tube, first resistor R1, the second electricity
Hinder R2 and first capacitor, which is characterized in that further include: negative-feedback circuit.Negative-feedback circuit includes: NPN triode and third electricity
Hinder R3.The connection of the source electrode of 3rd resistor one end and NMOS tube；The 3rd resistor other end is connected with electrolytic capacitor cathode, tri- pole NPN
The collector of pipe is connected with the grid of NMOS tube, and the base stage of NPN triode is connected with the source electrode of NMOS tube, the hair of NPN triode
Emitter-base bandgap grading is connected with output capacitance cathode.Further include: the 4th resistance.The emitter phase of the 4th resistance one end and the NPN triode
Even, the 4th resistance other end is connected with output capacitance cathode.Electrolytic capacitor is in parallel with constant-current driven chip, resistance R1, resistance R2
It connects with LED light string, accesses electrolytic capacitor both ends, the grid of M1 accesses between R1 and R2, and first capacitor C1 is in parallel with resistance R2.
By resistance R1, R2 to the drain voltage (V of NMOS tubeDRAIN), source voltage (VSOURCE) partial pressure is sampled to drive
The grid of NMOS tube M1, NMOS meets the condition V for working in constant current area at this timeDS> VGS-VTH, NMOS works in constant current area, and by
R1, R2 and C1 are filtered the grid voltage ripple of NMOS tube M1, but the low-pass filter of R1, R2 and C1 composition is simultaneously
Cannot the grid voltage ripple well to NMOS tube M1 effectively filter out, pass through resistance R3, NPN triode Q1 and resistance R4
The negative-feedback circuit of composition further handles the grid voltage of NMOS tube M1, obtains the grid voltage of a ripple-free
(VGATE), the LED current for then flowing through NMOS tube is also the electric current of ripple-free, to realize extraordinary no strobe effect.
Wherein, grid voltageObviouslyAvailable VGATE< VDRAIN, etc.
Imitate VGS< VDS, obtain VGS-VTH< VDS, therefore NMOS tube M1 works in constant current area.
The time constant for the low-pass filter that R1, R2 and C1 are constitutedWhen timeconstantτ is bigger, filtering
Effect is better, grid voltage (VGATE) ripple voltage is smaller, the electric current for flowing through NMOS tube M1 is more constant.If the foot that metal-oxide-semiconductor is chosen
It is enough big, when NMOS tube M1 works in constant current stateThereforeIfValue is excessive, VDRAINVoltage will be higher, the loss on NMOS tube M1
Larger, the efficiency of entire circuit will be lower.So forValue, should guarantee without stroboscopic in the case where, take as far as possible it is small,
It is higher that efficiency can be reached at this time, the lower optimum efficiency of current ripples.
The negative-feedback circuit being made of R3, R4 and NPN triode Q1, if the grid voltage ripple of NMOS tube M1 increases, by
In the characteristic of NMOS tube, cause the ripple current for flowing through NMOS tube that will also increase, R3 is current sampling resistor, flows through the ripple of R3
Electric current will also increase, and cause the ripple voltage on R3 that will also increase.Due on R3 voltage increase, cause triode Q1 base stage with
The voltage of emitter increases, and increases so as to cause emitter current is flowed through.According to dynatron performance, lead to triode Q1 collector
Electric current also increases.Increase due to flowing into transistor collector electric current.M1 grid voltage can be discharged, the reduction of M1 grid voltage is made,
The grid voltage that negative-feedback carrys out constant M1 is consequently formed.The constant grid voltage of M1 has become constant and has flowed through the circuit of M1, formed
The electric current of ripple-free.
R4 is emitter direct current negative feedback resistor, for stablizing quiescent point.Due to temperature change, triode will affect
Work, triode is always worked in into amplification region when stable state, direct current negative feedback resistor R4 is added to stablize quiescent operation
Point.As temperature raising, Q1 collector current ICIncrease, emitter current also increases, voltage (the i.e. emitter voltage U on R4E)
Increase.Since R4 is as quiescent point is stablized, so not considering the ripple current in circuit, it is assumed that electric current is without line in circuit
Wave, while voltage also ripple-free.So base voltage UBIt is basically unchanged, and UBE=UB-UE, so will lead to UBEReduce, later IB
And ICReduce therewith, to play the role of stable quiescent point.
As shown in figure 5, for another elimination current ripples circuit diagram provided in an embodiment of the present invention.
Another embodiment provides for a kind of elimination current ripples circuit diagrams.NPN triode is substituted with NMOS tube M2.Due to
NMOS tube is different from NPN triode, is not influenced by temperature, so not needing to stablize the resistance R4 of quiescent point.
Electrolytic capacitor is in parallel with constant-current driven chip, and resistance R1, resistance R2 connect with LED light string, accesses electrolytic capacitor two
It holds between the grid access R1 and R2 of M1, first capacitor C1 is in parallel with resistance R2.Wherein the drain electrode of M2 is connect with the grid of M1, M2
Grid be connected with the source electrode of M1, the source electrode of M2 is connected with output capacitance cathode.
If the grid voltage ripple of NMOS tube M1 increases, due to the characteristic of NMOS tube, lead to the ripple electricity for flowing through NMOS tube
Stream will also increase, and R3 is current sampling resistor, and the ripple current for flowing through R3 will also increase, and cause the ripple voltage on R3 that will also increase
Greatly.Since the voltage on R3 increases, M2 grid voltage is caused to increase, due to the characteristic of NMOS tube, the electric current for flowing through M2 is caused to increase
Greatly, since the electric current for flowing into M2 increases.M1 grid voltage can be discharged, makes the reduction of M1 grid voltage, negative-feedback is consequently formed
The grid voltage of constant M1.The constant grid voltage of M1 has become constant and has flowed through the circuit of M1, formed the electric current of ripple-free.
It is worth noting that, this active device makees negative-feedback circuit in example with triode, it is not limited to three poles in practice
Pipe realizes that the active devices such as metal-oxide-semiconductor, amplifier, Darlington transistor can make negative-feedback circuit.
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not intended to limit the present invention the foregoing is merely a specific embodiment of the invention
Protection scope, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include
Within protection scope of the present invention.
Claims (10)
1. a kind of circuit for eliminating current ripples, comprising: low-pass filter circuit and controllable transistor, which is characterized in that further include:
Negative-feedback circuit；
The low-pass filter circuit is for ripple voltage to be filtered；The negative-feedback circuit is used for filtered electricity
Pressure is further filtered, and ripple-free voltage is obtained；The controllable transistor generates ripple-free electricity according to ripple-free voltage
Stream.
2. circuit according to claim 1, which is characterized in that the negative-feedback circuit includes: NPN triode and third electricity
Hinder R3；
The connection of the base stage of described 3rd resistor one end and NPN triode；The 3rd resistor other end and electrolytic capacitor cathode phase
Even, the collector of the NPN triode is connected with the second end of controllable transistor, the base stage of the NPN triode and controllable crystalline substance
The third end of body pipe is connected, and the emitter of the NPN triode is connected with output capacitance cathode.
3. circuit according to claim 1, which is characterized in that the controllable transistor, comprising: metal-oxide-semiconductor, triode reach
Islington pipe.
4. circuit according to claim 1, which is characterized in that the low-pass filter circuit, comprising: first resistor R1,
Two resistance R2 and first capacitor；First resistor R1 and second resistance R2 series connection, first capacitor C1 are in parallel with resistance R2；Or
Including first resistor R1 and first capacitor；Or
Including voltage-stabiliser tube and first capacitor.
5. circuit according to claim 2, which is characterized in that further include: the 4th resistance, described 4th resistance one end and institute
The emitter for stating NPN triode is connected, and the 4th resistance other end is connected with output capacitance cathode.
6. circuit according to claim 2, which is characterized in that the NPN triode with NMOS tube, amplifier or reaches woods
The pipe that pauses substitutes.
7. circuit according to claim 2, which is characterized in that the metal-oxide-semiconductor selects NMOS tube；The NMOS tube work
In constant current area, the NMOS tube drain electrode, source electrode both end voltage VDSIt is greater than the NMOS tube grid, source electrode both end voltage VGSWith
Threshold voltage VTHDifference, i.e.,
VDS> VGS-VTH。
8. a kind of system for eliminating current ripples, which is characterized in that including as described in any claim in Claims 1-4
Elimination current ripples circuit and constant-current driven chip；The circuit for eliminating current ripples is connected with LED light string, is led to
Cross the ripple current in the circuit removal LED light string for eliminating current ripples.
9. a kind of method for eliminating current ripples characterized by comprising
Constant-current driven chip will have the alternating current of ripple to input to low-pass filter；
The alternating current for having ripple is converted to the direct current with ripple by a small margin by the low-pass filter circuit, and inputing to can
Control transistor；
The direct current with ripple by a small margin eliminates ripple by negative-feedback circuit, and exports the direct current of ripple-free.
10. according to the method described in claim 9, it is characterized in that, the metal-oxide-semiconductor, selects NMOS tube；The NMOS tube work
In constant current area, the NMOS tube drain electrode, source electrode both end voltage VDSIt is greater than the NMOS tube grid, source electrode both end voltage VGSWith
Threshold voltage VTHDifference, i.e.,
VDS> VGS-VTH。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711124999.0A CN109788600A (en) | 2017-11-14 | 2017-11-14 | A kind of circuit for eliminating current ripples, system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711124999.0A CN109788600A (en) | 2017-11-14 | 2017-11-14 | A kind of circuit for eliminating current ripples, system and method |
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| CN109788600A true CN109788600A (en) | 2019-05-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711124999.0A Pending CN109788600A (en) | 2017-11-14 | 2017-11-14 | A kind of circuit for eliminating current ripples, system and method |
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| CN103533719A (en) * | 2013-10-29 | 2014-01-22 | 上海晶丰明源半导体有限公司 | Triode-based light-emitting diode (LED) current ripple elimination driving circuit |
| CN103889113A (en) * | 2014-03-03 | 2014-06-25 | 深圳市明微电子股份有限公司 | LED current ripple eliminating circuit and LED lighting device |
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Application publication date: 20190521 |