CN204014192U - Adaptive LED current ripples is eliminated circuit - Google Patents
Adaptive LED current ripples is eliminated circuit Download PDFInfo
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- CN204014192U CN204014192U CN201420379530.7U CN201420379530U CN204014192U CN 204014192 U CN204014192 U CN 204014192U CN 201420379530 U CN201420379530 U CN 201420379530U CN 204014192 U CN204014192 U CN 204014192U
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Abstract
The utility model provides a kind of adaptive LED current ripples elimination circuit to comprise: power tube Q108, current sampling resistor R109, operational amplifier U110 and a self adaptation benchmark voltage generation circuit.Negative electrode, the source electrode that the drain electrode of power tube Q108 connects LED lamp load connects one end, the inverting input of operational amplifier U110 and the input of self adaptation benchmark voltage generation circuit of current sampling resistor R109; The in-phase input end of the output termination operational amplifier U110 of self adaptation benchmark voltage generation circuit; The grid of the output termination power tube Q108 of operational amplifier U110; The other end of current sampling resistor R109 is eliminated the earth terminal of circuit as this adaptive LED current ripples.Self adaptation benchmark voltage generation circuit for according to sampled voltage, regulates its output voltage automatically, control algorithm amplifier U110, thus operating state that can power ratio control pipe Q108 is transferred to saturation region from linear zone.The utility model is used for eliminating LED stroboscopic.
Description
Technical field
The present invention relates to illumination driving circuit, relate in particular to LED constant-current drive circuit.
Background technology
LED is typical current mode device, very high to the stability requirement of operating current.The rough schematic of traditional LED constant-current drive circuit as shown in Figure 1, comprises interchange input source, rectifier bridge, and constant-current driven module, filter capacitor and LED load, this LED load and filter capacitor are directly in parallel.
In order to reach the requirement of High Power Factor, the electric current of above-mentioned constant-current driven module output contains working frequency ripple wave component, for example input source frequency is 50Hz, the ripple that electric current of constant-current driven module output contains 100Hz, and the voltage on filter capacitor also contains the ripple of 100Hz.Meanwhile, the electric current that flows through LED load also contains the ripple of 100Hz, the stroboscopic that causes the light of LED load output to contain 100Hz.Although people's naked eyes are difficult to perceive this low frequency stroboscopic, but human eye is under this lighting environment for a long time, can cause optic nerve fatigue, be detrimental to health, IEEE proposed LED illumination flicker to healthy potential hazard in succession at 2010,2013, as light sensitivity epilepsy, antimigraine, dizzy etc., so increasing to the cry of flicker free LED illumination.And larger current ripples, can affect the luminous efficiency of LED, and shorten its useful life.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of adaptive LED current ripples to eliminate circuit, can reach the object of eliminating LED stroboscopic.
For achieving the above object, the present invention, in existing LED constant-current drive circuit, has added this adaptive LED current ripples to eliminate circuit.
Existing LED constant-current drive circuit comprises: rectification circuit, constant-current circuit, output filter capacitor, LED lamp load.
This adaptive LED current ripples is eliminated circuit and is comprised: power tube Q108, current sampling resistor R109, operational amplifier U110 and a self adaptation benchmark voltage generation circuit.Negative electrode, the source electrode that the drain electrode of power tube Q108 connects LED lamp load connects one end, the inverting input of operational amplifier U110 and the input of self adaptation benchmark voltage generation circuit of current sampling resistor R109; The in-phase input end of the output termination operational amplifier U110 of self adaptation benchmark voltage generation circuit; The grid of the output termination power tube Q108 of operational amplifier U110; The other end of current sampling resistor R109 is eliminated the earth terminal of circuit as this adaptive LED current ripples.
The LED drive current power tube Q108 that flows through, on current sampling resistor R109, produce sampled voltage, self adaptation benchmark voltage generation circuit is used for according to sampled voltage, automatically regulate its output voltage, control algorithm amplifier U110, make in the time that the ripple current fluctuation in LED drive current exceedes setting fluctuation range, the output of operational amplifier U110 reduces, thereby the operating state of power ratio control pipe Q108 is transferred to saturation region from linear zone.
Described self adaptation benchmark voltage generation circuit comprises: K switch 117, capacitor C 119, reference voltage generating circuit, comparator U124 and U125 or door G128, with door G131, a current source I135, current source I133, capacitor C 134.
K switch 117 is controlled by clock signal clk _ A, and clock signal clk _ A is K switch 117 conductings of high level, clock signal clk _ A be low level K switch 117 end.One end of K switch 117 connects one end of current sampling resistor R109 as the input of self adaptation benchmark voltage generation circuit, obtain the voltage signal V of sampling
cS; Voltage signal V simultaneously
cSinput to respectively the in-phase input end of comparator U124 and the inverting input of comparator U125, and the inverting input of operational amplifier U110; One end of another termination capacitor C 119 of K switch 117 and the input of reference voltage generating circuit; Another termination adaptive LED current ripples of capacitor C 119 is eliminated the earth terminal of circuit.Reference voltage generating circuit remains on the voltage V in capacitor C 119 for basis
cS_Sampled, produce two reference voltage V
cS_Sampled+ Δ V and V
cS_Sampled-Δ V, and deliver to respectively the inverting input of comparator U124 and the in-phase input end of comparator U125; Comparator U124 and U125 output termination separately or two inputs of door G128, or the output termination of door G128 and an input of door G131, clock signal clk _ B inputs another input with door G131; Controlled end with the output termination current source I133 of door G131.The first termination feeder ear of current source I135, the first end of the second termination current source I133, one end of capacitor C 134, and the in-phase input end of operational amplifier U110; Another termination adaptive LED current ripples of the second end of current source I133 and capacitor C 134 is eliminated the earth terminal of circuit.
Current sampling resistor R109 also can not be included in above-mentioned adaptive LED current ripples and eliminate in circuit, but as an external sampling resistor, annexation is with above-mentioned current sampling resistor R109.
Clock signal clk _ A is identical with clock signal clk _ B frequency, 90 ° of phase phasic differences between the two, and the signal period is T, and each cycle T all comprises 4 periods.In the T1 period: CLK_A is that high level, CLK_B are low levels; In the T2 period: CLK_A is that low level, CLK_B are low levels; In the T3 period: CLK_A is low level, CLK_B is high level; In the T4 period: CLK_A is low level, CLK_B is low level.
Under initial condition, the output voltage of self adaptation benchmark voltage generation circuit approaches supply voltage, make operational amplifier U110 output HIGH voltage, power ratio control pipe Q108 conducting, and be operated in linear zone (the namely non-saturated region of metal-oxide-semiconductor), LED drive current can be unrestricted by power tube Q108, and produce sampled voltage on current sampling resistor R109, self adaptation benchmark voltage generation circuit can be according to sampled voltage, automatically regulate its output voltage, in the time that the ripple current fluctuation in LED drive current exceedes setting fluctuation range, be reflected in the performance of voltage, the voltage V of feedback
cScan drop on voltage range (V
cS_Sampled-Δ V, V
cS_Sampled+ Δ V) in addition, now the output voltage of self adaptation benchmark voltage generation circuit reduces, the output of operational amplifier U110 reduces, thereby the operating state of power ratio control pipe Q108 is transferred to saturation region (saturation region of metal-oxide-semiconductor, i.e. amplification region) from linear zone.Power tube Q108 enters after saturation region operation, its equivalence exchanges output resistance and increases, be far longer than the equivalent resistance of LED lamp, therefore the voltage waveform of power tube Q108 drain terminal can be followed the voltage waveform on output filter capacitor, final counteracting drops on the voltage fluctuation on LED lamp, thereby eliminates the ripple current of LED lamp.
Traditional LED illumination driving circuit, due to the direct ground connection of negative electrode of LED lamp, the voltage fluctuation on output filter capacitor, has all dropped on LED lamp, has caused the low frequency stroboscopic of LED lamp.
Compared with prior art, the voltage of power tube drain electrode of the present invention equals the voltage ripple composition on output filter capacitor substantially, making the voltage in LED load is the direct voltage of an approximate ripple-free, electric current in LED load is the direct current of an approximate ripple-free, thereby reaches the object of LED without stroboscopic.
Brief description of the drawings
Fig. 1 is the existing rough schematic that has ripple LED constant-current drive circuit.
Fig. 2 is the schematic diagram of the LED constant-current drive circuit without stroboscopic that provides of the embodiment of the present invention one.
Fig. 3 is the clock frequency phase diagram that the embodiment of the present invention adopts.
The schematic diagram of the LED constant-current drive circuit without stroboscopic that Fig. 4 provides for the embodiment of the present invention two.
Fig. 5 is the supply power mode schematic diagram that a kind of adaptive LED current ripples of the present invention is eliminated circuit.
Fig. 6 is the supply power mode schematic diagram that another kind of adaptive LED current ripples of the present invention is eliminated circuit.
Fig. 7 is a kind of applied topology structural representation of the present invention.
Fig. 8 is another kind of applied topology structural representation of the present invention.
Embodiment
Below in conjunction with concrete drawings and Examples, the invention will be further described.
Fig. 2 is embodiments of the invention one.
In an existing LED constant-current drive circuit, the adaptive LED current ripples that has added the present invention to propose is eliminated circuit.Therefore whole LED constant-current drive circuit comprises current rectifying and wave filtering circuit D101, D102, D103, D104,105, and input ac voltage is carried out to rectification, the interchange all-wave voltage that is 50/60Hz by frequency, and being rectified into frequency is the alternation voltage of 100/120Hz; Constant-current circuit 105, has power factor emendation function, and output average current is constant, but having frequency is the ripple current of 100/120Hz; C106 is output filter capacitor; D107 is the LED lamp of one group of series connection; Q108 is power tube, can be MOSFET.R109 is current sampling resistor; U110 is operational amplifier; The 111st, self adaptation benchmark voltage generation circuit.
The output current 112 that constant-current circuit 105 produces, is divided into LED drive current 113 and output filter capacitor charging current 114 two-way, wherein 113 gives LED load D107; 114 give output filter capacitor C106.
Self adaptation benchmark voltage generation circuit 111 output voltage signals 115,115th, reference voltage V
rEF, give the in-phase input end of operational amplifier U110, V
rEFinitial voltage approach supply voltage, make operational amplifier U110 output HIGH voltage power ratio control pipe Q108 be operated in linear zone (non-saturated region of metal-oxide-semiconductor), LED drive current 113 can be unrestricted by power tube Q108; Current sampling resistor R109 converts LED driving current signal 113 voltage signal 116 (being voltage Vcs) to and gives inverting input and the self adaptation benchmark voltage generation circuit 111 of operational amplifier U110.
Owing to having comprised the ripple current that frequency is 100/120Hz in LED driving current signal 113, therefore voltage signal 116 comprises the ripple voltage that frequency is 100/120Hz equally.
K switch 117 is carried out switching under the control of signal 118, signal 118 is the clock signal clk _ A with a certain frequency, for example, in the high level time of clock, and signal 118 control switch K117 conductings, in the low level time of clock, signal 118 control switch K117 cut-offs.Under the control of sample frequency CLK_A, Cycle by Cycle by voltage signal V
cSsample and remain in capacitor C 119, the voltage signal 120 remaining in capacitor C 119 is V
cS_Sampled, after the processing of reference voltage generating circuit 121, produce two-way reference voltage 122 and 123, wherein 122 is V
cS_Sampled+ Δ V, delivers to the inverting input of comparator U124; 123 is V
cS_Sampled-Δ V, delivers to the in-phase input end of comparator U125.The anti-phase input termination voltage signal 116 (being voltage Vcs) of the in-phase input end of comparator U124 and comparator U125.It is smaller that Δ V gets, and is generally tens millivolts, to suppress ripple fluctuation.
Comparator U124 output signal 126, comparator U125 output signal 127, signal 126 and 127 is delivered to or door G128, or door G128 output signal 129, delivers to and door G131 together with signal 130, signal 130 is the clock signal clk _ B with a certain frequency, control current source I133 with the output 132 of door G131 and whether discharge, in this embodiment of the present invention, in the time that 132 are high level, control current source I133 electric discharge, the voltage signal 115 of capacitor C 134 (is V
rEF) reduce along with the electric discharge of current source I133.
Fig. 3 is the phase diagram of clock signal clk _ A and CLK_B.Clock signal clk _ A is identical with clock signal clk _ B frequency, 90 ° of phase phasic differences between the two, and the signal period is T, and each cycle T all comprises 4 periods: in the T1 period: CLK_A is that high level, CLK_B are low levels; In the T2 period: CLK_A is that low level, CLK_B are low levels; In the T3 period: CLK_A is low level, CLK_B is high level; In the T4 period: CLK_A is low level, CLK_B is low level.The T1 period is voltage sample process, and the T3 period is controlled discharge process, and these two processes rely on clock signal clk _ A and CLK_B to distinguish.Clock signal clk _ A and CLK_B can produce by built-in two clock sources in self adaptation benchmark voltage generation circuit 111 conventionally.
Within the T1 period: 118 signal CLK_A are that high level, 130 signal CLK_B are low levels, and K switch 117 conductings, by the V in the T1 period
cSaverage voltage is sampled and is remained in capacitor C 119, and signal 132 is low levels, and current source I133 does not discharge.Within the T2 period, 118 signal CLK_A are low levels, and 130 signal CLK_B are low levels, and current source I133 does not discharge.Within the T3 period, 118 signal CLK_A are low levels, and 130 signal CLK_B are high level, allow, with door G131, the output of comparator U124 or U125 is transferred to signal 132, if V
cSvoltage is greater than or less than V
cS_Sampledthe difference of voltage exceedes Δ V, control current source I133 electric discharge, otherwise current source I133 does not discharge; Within the T4 period, 118 signal CLK_A are low levels, and 130 signal CLK_B are low levels, and current source I133 does not discharge.
Current source I135 charges to capacitor C 134, wherein current source I135 can be fixed current source, can be also controlled current source, in this embodiment of the present invention: at the initial stage of powering on, current source I135 charges to and approaches supply voltage capacitor C 134, then stops capacitor C 134 to charge.In another specific embodiment of the present invention: at the initial stage of powering on, current source I135 charges to and approaches supply voltage capacitor C 134, then just capacitor C 134 is charged once at interval of a period of time.
LED drive current 113 converts voltage signal 116 (being voltage Vcs) in resistance R 109, and 116 are sampled and remain in capacitor C 119, therefore voltage V
cS_Sampledcan reflect the average current of LED.Work as V
cSwhen the ripple voltage of voltage within the T3 period exceedes Δ V, signal 132 is controlled current source I133 capacitor C 134 is discharged, 115 voltage signal V
rEFreduce, work as V
rEFafter voltage declines gradually, the output of operational amplifier U110 reduces gradually, power ratio control pipe Q108 transfers to operate in saturation district (amplification region) gradually from linear work district (non-saturated region), enter behind operate in saturation district, the equivalent resistance of power tube Q108 increases, much larger than the equivalent resistance of LED, therefore the ripple voltage in capacitor C 106, drop on the drain electrode of power tube Q108, make the voltage at LED lamp string D107 two ends can keep constant, thereby eliminate or reduced the ripple current in LED drive current 113.
The first end of current source I135 is that electric current flows into end, and the second end is outflow of bus current end; The first end of current source I133 is that electric current flows into end, and the second end is outflow of bus current end.
Fig. 4 is second embodiment of the present invention.In embodiment mono-, the drain voltage V of power tube Q108
dcan cause the high serious problem of generating heat that causes of Q108 consumed power if too high.Therefore on the embodiment basis shown in Fig. 3, increased a comparator U136, now current source I135 is controlled current source; The in-phase input end of comparator U136 connects voltage signal 137,137th, the drain voltage V of power tube Q108
d, anti-phase input termination voltage signal 138,138 is threshold voltage V
1, the controlled end of the output termination current source I135 of comparator U136; Whether the output signal 139 of comparator U136, control current source I135 and charge, and in the present embodiment, when signal 139 is high level, controls current source I135 capacitor C 134 is charged.As voltage V
dexceed V
1time, current source I135 charges to capacitor C 134.
If voltage V
rEFbecause certain reason declines, such as capacitor C 134 self discharges, power tube Q108 grid voltage can decline, and power tube Q108 belt current ability declines, and the mean value of LED drive current 113 regards constant as, when LED drive current 113 is greater than reference voltage V
rEFwith feedback loop control produce electric current time, unnecessary electric current can make voltage signal V
dincrease, exceed threshold voltage V
1time, current source I135 charges to capacitor C 134, reference voltage V
rEFincrease, power ratio control pipe Q108 absorbs more electric current, automatically completes electric current adjustment process.
In the specific implementation, can be by power tube Q108, operational amplifier U110, self adaptation benchmark voltage generation circuit 111, comparator U136 integrates, and forms an adaptive LED current ripples and eliminates circuit 201.Fig. 5 is the supply power mode of circuit 201, and circuit 201 has three port VDD, CS, D, and VDD is that circuit 201 is powered, and CS end is for external impressed current sampling resistor R109, and LED electric current flows into from D end.
Also can by further by current sampling resistor R109 also integrated enter adaptive LED current ripples eliminate circuit, form adaptive LED current ripples and eliminate circuit 301, as shown in Figure 6.
In Fig. 5 and Fig. 6, the about 3.4v of pressure reduction at last LED two ends in LED string, is enough to eliminate circuit supply for adaptive LED current ripples.
Finally it should be noted that, although power tube Q108 adopts MOSFET pipe in two embodiment of the present invention, Q108 adopts BJT triode to be also fine.In foregoing description, the saturation region of the corresponding triode in linear work district (non-saturated region) of metal-oxide-semiconductor, the amplification region of the corresponding triode in saturation region (amplification region) of metal-oxide-semiconductor, corresponding relation can be understood the course of work of BJT triode in foregoing circuit like this.
Fig. 7 is a concrete Application Example in isolated form anti exciting converter LED illumination according to the present invention.
Fig. 8 is a concrete Application Example in non-isolated buck-type LED illumination according to the present invention.
Above, be only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. adaptive LED current ripples is eliminated a circuit, it is characterized in that, comprising:
Power tube Q108, current sampling resistor R109, operational amplifier U110 and a self adaptation benchmark voltage generation circuit (111);
Negative electrode, the source electrode that the drain electrode of power tube Q108 connects LED lamp load connects one end, the inverting input of operational amplifier U110 and the input of self adaptation benchmark voltage generation circuit (111) of current sampling resistor R109; The in-phase input end of the output termination operational amplifier U110 of self adaptation benchmark voltage generation circuit (111); The grid of the output termination power tube Q108 of operational amplifier U110; The other end of current sampling resistor R109 is eliminated the earth terminal of circuit as this adaptive LED current ripples;
The LED drive current power tube Q108 that flows through, on current sampling resistor R109, produce sampled voltage, self adaptation benchmark voltage generation circuit (111) is for according to sampled voltage, automatically regulate its output voltage, control algorithm amplifier U110, make in the time that the ripple current fluctuation in LED drive current exceedes setting fluctuation range, the output of operational amplifier U110 reduces, thereby the operating state of power ratio control pipe Q108 is transferred to saturation region from linear zone.
2. adaptive LED current ripples as claimed in claim 1 is eliminated circuit, it is characterized in that, described self adaptation benchmark voltage generation circuit (111) comprising:
K switch 117, capacitor C 119, reference voltage generating circuit (121), comparator U124 and U125 or door G128, with door G131, a current source I135, current source I133, capacitor C 134;
K switch 117 is controlled by clock signal clk _ A, and clock signal clk _ A is K switch 117 conductings of high level, clock signal clk _ A be low level K switch 117 end;
One end of K switch 117 connects one end of current sampling resistor R109 as the input of self adaptation benchmark voltage generation circuit (111), obtain the voltage signal V of sampling
cS; Voltage signal V simultaneously
cSinput to respectively the in-phase input end of comparator U124 and the inverting input of comparator U125, and the inverting input of operational amplifier U110; The input of one end of another termination capacitor C 119 of K switch 117 and reference voltage generating circuit (121); Another termination adaptive LED current ripples of capacitor C 119 is eliminated the earth terminal of circuit;
Reference voltage generating circuit (121) remains on the voltage V in capacitor C 119 for basis
cS_Sampled, produce two reference voltage V
cS_Sampled+ Δ V and V
cS_Sampled-Δ V, and deliver to respectively the inverting input of comparator U124 and the in-phase input end of comparator U125; Comparator U124 and U125 output termination separately or two inputs of door G128, or the output termination of door G128 and an input of door G131, clock signal clk _ B inputs another input with door G131; Controlled end with the output termination current source I133 of door G131;
The first termination feeder ear of current source I135, the first end of the second termination current source I133, one end of capacitor C 134, and the in-phase input end of operational amplifier U110; Another termination adaptive LED current ripples of the second end of current source I133 and capacitor C 134 is eliminated the earth terminal of circuit;
Clock signal clk _ A is identical with clock signal clk _ B frequency, 90 ° of phase phasic differences between the two, and the signal period is T, and each cycle T all comprises 4 periods:
In the T1 period: CLK_A is that high level, CLK_B are low levels; In the T2 period: CLK_A is that low level, CLK_B are low levels; In the T3 period: CLK_A is low level, CLK_B is high level; In the T4 period: CLK_A is low level, CLK_B is low level.
3. adaptive LED current ripples as claimed in claim 2 is eliminated circuit, it is characterized in that:
Described current source I135 is fixed current source or controlled current source.
4. adaptive LED current ripples as claimed in claim 2 is eliminated circuit, it is characterized in that:
Described current source I135 is controlled current source; And this adaptive LED current ripples is eliminated circuit and is also comprised a comparator U136; The in-phase input end of comparator U136 meets the drain voltage V of power tube Q108
d, threshold voltage V of anti-phase input termination
1; The controlled end of the output termination current source I135 of comparator U136; As voltage V
dexceed V
1time, current source I135 charges to capacitor C 134.
5. the adaptive LED current ripples as described in any one in claim 1～4 is eliminated circuit, it is characterized in that: power tube Q108 is MOSFET pipe.
6. the adaptive LED current ripples as described in any one in claim 5 is eliminated circuit, it is characterized in that: power tube Q108 can replace with a BJT triode.
7. the adaptive LED current ripples as described in any one in claim 1～4 is eliminated circuit, it is characterized in that:
Current sampling resistor R109 is not included in above-mentioned adaptive LED current ripples and eliminates in circuit, but as an external sampling resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420379530.7U CN204014192U (en) | 2014-07-09 | 2014-07-09 | Adaptive LED current ripples is eliminated circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420379530.7U CN204014192U (en) | 2014-07-09 | 2014-07-09 | Adaptive LED current ripples is eliminated circuit |
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| Publication Number | Publication Date |
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| CN204014192U true CN204014192U (en) | 2014-12-10 |
Family
ID=52054128
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|---|---|---|---|
| CN201420379530.7U Withdrawn - After Issue CN204014192U (en) | 2014-07-09 | 2014-07-09 | Adaptive LED current ripples is eliminated circuit |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104080256A (en) * | 2014-07-09 | 2014-10-01 | 无锡硅动力微电子股份有限公司 | Self-adaptation LED current ripple canceling circuit |
| CN106160472A (en) * | 2016-08-11 | 2016-11-23 | 深圳欧创芯半导体有限公司 | Line loss compensation method and device for electric pressure converter |
| CN106658862A (en) * | 2017-01-17 | 2017-05-10 | 厦门奇力微电子有限公司 | Current ripple removal circuit and method |
| CN107094333A (en) * | 2016-10-26 | 2017-08-25 | 杰华特微电子（张家港）有限公司 | Adaptive fast response circuit, fast response method and LED drive circuit |
| CN108306492A (en) * | 2017-01-13 | 2018-07-20 | 华润矽威科技（上海）有限公司 | A kind of adaptive output current removes ripple circuit and its goes ripple method |
| CN109167506A (en) * | 2018-10-26 | 2019-01-08 | 苏州菲达旭微电子有限公司 | A kind of current filtering circuit |
| CN110838789A (en) * | 2018-08-17 | 2020-02-25 | 美芯晟科技（北京）有限公司 | Ripple suppression circuit, system and method |
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2014
- 2014-07-09 CN CN201420379530.7U patent/CN204014192U/en not_active Withdrawn - After Issue
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104080256A (en) * | 2014-07-09 | 2014-10-01 | 无锡硅动力微电子股份有限公司 | Self-adaptation LED current ripple canceling circuit |
| CN104080256B (en) * | 2014-07-09 | 2016-05-11 | 无锡硅动力微电子股份有限公司 | Adaptive LED current ripples is eliminated circuit |
| CN106160472A (en) * | 2016-08-11 | 2016-11-23 | 深圳欧创芯半导体有限公司 | Line loss compensation method and device for electric pressure converter |
| CN107094333A (en) * | 2016-10-26 | 2017-08-25 | 杰华特微电子（张家港）有限公司 | Adaptive fast response circuit, fast response method and LED drive circuit |
| CN107094333B (en) * | 2016-10-26 | 2020-01-14 | 杰华特微电子（张家港）有限公司 | Self-adaptive quick response circuit, quick response method and LED drive circuit |
| CN108306492A (en) * | 2017-01-13 | 2018-07-20 | 华润矽威科技（上海）有限公司 | A kind of adaptive output current removes ripple circuit and its goes ripple method |
| CN108306492B (en) * | 2017-01-13 | 2020-09-08 | 华润矽威科技（上海）有限公司 | Self-adaptive output current ripple removing circuit and ripple removing method thereof |
| CN106658862A (en) * | 2017-01-17 | 2017-05-10 | 厦门奇力微电子有限公司 | Current ripple removal circuit and method |
| CN110838789A (en) * | 2018-08-17 | 2020-02-25 | 美芯晟科技（北京）有限公司 | Ripple suppression circuit, system and method |
| CN110838789B (en) * | 2018-08-17 | 2021-06-04 | 美芯晟科技（北京）有限公司 | Ripple suppression circuit, system and method |
| CN109167506A (en) * | 2018-10-26 | 2019-01-08 | 苏州菲达旭微电子有限公司 | A kind of current filtering circuit |
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