CN108513408A - Ripple eliminates circuit, ripple removing method and applies its LED control circuit - Google Patents
Ripple eliminates circuit, ripple removing method and applies its LED control circuit Download PDFInfo
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- CN108513408A CN108513408A CN201810432782.4A CN201810432782A CN108513408A CN 108513408 A CN108513408 A CN 108513408A CN 201810432782 A CN201810432782 A CN 201810432782A CN 108513408 A CN108513408 A CN 108513408A
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- 238000000034 method Methods 0.000 title claims abstract description 8
- 238000001514 detection method Methods 0.000 claims abstract description 66
- 238000012512 characterization method Methods 0.000 claims abstract description 5
- 230000001105 regulatory effect Effects 0.000 claims description 33
- 230000005611 electricity Effects 0.000 claims description 11
- 238000007600 charging Methods 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 14
- 230000009471 action Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
- H02M1/15—Arrangements for reducing ripples from dc input or output using active elements
Abstract
The present invention proposes that a kind of ripple eliminates circuit, ripple removing method and applies its LED control circuit, and the ripple eliminates circuit and obtains the detection signal of characterization load cold end voltage, and when the detection signal is less than first threshold, load current reduces；When the detection signal is more than second threshold, load current increases；When the detection signal, which is more than or equal to first threshold, is less than or equal to second threshold, load current is constant.Ripple eradicating efficacy of the present invention is notable, and load current is more stable.
Description
Technical field
The present invention relates to field of power electronics, more particularly to a kind of ripple eliminates circuit, ripple removing method and applies it
LED control circuit.
Background technology
AC network is inputted and is converted to positive raised line design by LED drive circuit by AC-DC conversion circuits more at present
The dc power of wave exports, and LED is upper to carry ripple, damaged to human eye, therefore can use line shown in FIG. 1 in the prior art
Wave eliminates circuit to filter out the ripple on LED, and reference voltage V reg is arranged, works as VD>VC is pulled up when Vreg, works as VD<Vreg is at present
VC is drawn, can realize the control to LED ripples by adjusting the size of upper pull-down current i02, i01 and capacitance C02.
Since actual power grid has fluctuation, the voltage of VD and VC can also be fluctuated in the prior art, lead to the electricity of LED
Stream can occur shake and cause discomfort, the prior art that can not solve this technical problem human eye.
Invention content
Circuit, removing method are eliminated the object of the present invention is to provide a kind of ripple promoting ripple eradicating efficacy and apply it
LED control circuit, for solving the problems, such as LED current of the existing technology fluctuation.
To achieve the above object, the present invention provides a kind of ripples to eliminate circuit, including：
Current regulating module, ripple cancellation module and detection signal generator module, it is described to detect the defeated of signal generator module
Enter end connection load cold end, the detection signal of output end output characterization load cold end voltage, the current regulation
The input terminal of module receives the detection signal, first threshold and second threshold, the output end connection of the current regulating module
The control terminal of the ripple cancellation module, the ripple cancellation module and load in series；
When the detection signal is less than first threshold, load current reduces；
When the detection signal is more than second threshold, load current increases；
When the detection signal, which is more than or equal to first threshold, is less than or equal to second threshold, load current is constant.
Optionally, when the detection signal is less than first threshold, the current regulating module exports the first electric current, described
First electric current is for adjusting load current reduction；When the detection signal is more than second threshold, the current regulating module is defeated
Go out the second electric current, second electric current is for adjusting load current increase；When the detection signal is small more than or equal to first threshold
When equal to second threshold, the current regulating module not output current.
Optionally, the current regulating module includes the first current generating circuit, and first current generating circuit includes
First current mirror and the first current source, first current source connects the first current mirror input terminal and detection signal generator module is defeated
Outlet, the first current source output current are the first threshold, when the detection signal is less than first threshold, the first electricity
It flows mirror and exports first electric current, when the detection signal is more than or equal to first threshold, the first current mirror not input and output electricity
Stream.
Optionally, the current regulating module further includes the second current generating circuit, the second current generating circuit packet
The second current mirror and the second current source are included, second current source one end connects the second current mirror input terminal and detection signal generates
Module output end, the other end receive supply voltage, and the second current source output current is the second threshold, when the detection
When signal is more than second threshold, the second current mirror exports second electric current, when the detection signal is less than or equal to second threshold
When, the second current mirror not input and output electric current.
Optionally, the current regulating module includes the first comparison circuit, the second comparison circuit and D/A converting circuit, institute
It states the first comparison circuit and receives detection signal and first threshold, export the first comparison signal；Second comparison circuit receives inspection
Signal and second threshold are surveyed, the second comparison signal is exported；The D/A converting circuit receives first comparison signal and described
Second comparison signal exports the first electric current either the second electric current or non-output current；When the detection signal is less than the first threshold
When value, the D/A converting circuit exports first electric current, and when the detection signal is more than second threshold, the digital-to-analogue turns
The second electric current described in circuit output is changed, it is described when the detection signal, which is more than or equal to first threshold, is less than or equal to second threshold
D/A converting circuit not output current.
Optionally, the ripple cancellation module includes that the first capacitance and adjustment are managed, and the first capacitance first end is as line
Wave cancellation module control terminal connects the current regulating module output end, and second end is grounded, and voltage is line on first capacitance
Wave cancellation module controls terminal voltage, is denoted as first voltage；The adjustment pipe and load in series；The first voltage is for driving institute
Adjustment pipe is stated, to adjust load current.
Optionally, the ripple cancellation module further includes the first amplifier and first resistor, the adjustment pipe first end connection
The load cold end, the adjustment pipe second end connect on the ground, first amplifier first by the first resistor
Input terminal connects the first capacitance second end, and the first amplifier second end connects the adjustment pipe and the first resistor
Common end, the first amplifier output end connect the adjustment pipe control terminal.
Optionally, when the sampled signal is more than second threshold, the current regulating module exports the second electric current to institute
The first capacitor charging is stated, the first voltage increases, and load current increases；When the sampled signal is less than first threshold, institute
It states current regulating module and exports the first electric current for discharging to first capacitance, the first voltage reduces, under load current
Drop；When the sampled signal is more than or equal to first threshold and is less than or equal to second threshold, the current regulating module does not export
Electric current, the first voltage is constant, and load current is constant.
Optionally, the detection signal generator module includes the second amplifier, switching tube and second resistance, the second resistance
First end connection load cold end, the second resistance second end connecting valve pipe first end, second amplifier first are defeated
Entering end and receives second voltage, second input terminal of the second amplifier connects the common end of the second resistance and the switching tube,
The second amplifier output end connects the switch controlled end, the switching tube second end ground connection.
The present invention also provides a kind of LED control circuits, including LED drive circuit and a kind of ripple of any of the above to eliminate electricity
Road, the LED drive circuit are powered after receiving exchange input to LED load.
The present invention also provides a kind of ripple removing methods, obtain the detection signal of characterization load cold end voltage, work as institute
When stating detection signal less than first threshold, load current reduces；When the detection signal is more than second threshold, load current increases
Add；When the detection signal, which is more than or equal to first threshold, is less than or equal to second threshold, load current is constant.
Compared with prior art, the present invention has the following advantages：The present invention the detection signal be less than first threshold when,
Load current reduces；When the detection signal is more than second threshold, load current increases；When the detection signal is more than or equal to
When first threshold is less than or equal to second threshold, load current is constant.Control mode of the present invention is simple and effective, has ripple to eliminate work(
Can, load current stability is good.
Description of the drawings
Fig. 1 is that prior art ripple eliminates circuit and applies its LED control circuit schematic diagram；
Fig. 2 is that the first ripple of the invention eliminates circuit and applies its LED control circuit schematic diagram；
Fig. 3 is that second of ripple of the present invention eliminates circuit and apply its LED control circuit schematic diagram；
Fig. 4 is the fundamental diagram that ripple of the present invention eliminates circuit；
Fig. 5 is detection signal generator module circuit diagram；
Fig. 6 is current regulating module first embodiment schematic diagram；
Fig. 7 is the first current generating circuit embodiment schematic diagram in Fig. 6；
Fig. 8 is the second current generating circuit embodiment schematic diagram in Fig. 6；
Fig. 9 is current regulating module second embodiment schematic diagram；
Specific implementation mode
The preferred embodiment of the present invention is described in detail below in conjunction with attached drawing, but the present invention is not restricted to these
Embodiment.The present invention covers any replacement made in the spirit and scope of the present invention, modification, equivalent method and scheme.
In order to make the public have thorough understanding to the present invention, it is described in detail in following present invention preferred embodiment specific
Details, and description without these details can also understand the present invention completely for a person skilled in the art.
The present invention is more specifically described by way of example with reference to attached drawing in the following passage.It should be noted that attached drawing is adopted
Use with more simplified form and non-accurate ratio, only to it is convenient, lucidly aid in illustrating the embodiment of the present invention
Purpose.
It eliminates circuit as shown in Fig. 2, illustrating the first ripple of the invention and applies its LED control circuit schematic diagram,
It includes detection signal generator module U02, current regulating module U01 and ripple cancellation module, the inspection that the ripple, which eliminates circuit,
It surveys signal generator module input terminal and connects LED load cold end, LED load cold end voltage is VD, and detection signal generates
Voltage VD is switched to the detection signal I for characterizing LED load electric current iLED by circuitD, the ripple cancellation module include capacitance C02 and
Adjust pipe M01, the capacitance C02 first ends connection current regulating module U01 output ends and adjustment pipe M01 control terminals, the electricity
It is first voltage VC to hold voltage on C02, and the capacitance C02 second ends ground connection, the adjustment pipe M01 first ends connect LED load
Cold end, second end ground connection.
When voltage VD is more than VDH, current regulating module U01 exports the second electric current i02 and is used to charge to capacitance C02, electricity
VC pull-up, LED load electric current is pressed to increase, voltage VD constantly drops below VDH；When voltage VD drops below VDL, electric current
Adjustment module U01 exports the first electric current i01 and is used to discharge to capacitance C02, and voltage VC is pulled down, LED load current reduction, voltage
VD is continuously increased more than VDL.Final voltage VD can stablize between VDL and VDH, and in this case, power grid has subtle wave
When dynamic, output current, capacitance C02 do not have the action of charge and discharge to current regulating module yet, so voltage VC is remained unchanged, from
And LED load electric current iLED there will not be fluctuation.
It eliminates circuit as shown in figure 3, illustrating second of ripple of the present invention and applies its LED control circuit schematic diagram,
The present embodiment is the improvement done on the basis of Fig. 3, and the main distinction is that ripple cancellation module increases amplifier U10 and resistance
R10, the amplifier R10 in-phase input ends connect capacitance C02 first ends, and inverting input connects amplifier second end and resistance R10
First end, resistance R10 second ends ground connection.Since final voltage VD can stablize between VDL and VDH, capacitance C02 does not have charge and discharge
The action of electricity, voltage VC are remained unchanged, and voltage is constant on resistance R10, and load LED current iLED is constant.
As shown in figure 4, illustrating ripple of the present invention eliminates circuit operation principle, with reference to Fig. 4 (a), VD<When VDL, generation is put
Electric current i01, VD>When VDH, charging current i02, VDL≤VD≤VDH are generated, electric current is not generated.With reference to Fig. 4 (b), power grid has
When subtle fluctuation, capacitance C02 does not have the action of charge and discharge, so voltage VC is remained unchanged, to which iLED there will not be wave
It is dynamic.
As shown in figure 5, illustrating detection signal generator module circuit diagram, including amplifier U1, switching tube M1 and resistance
R1, resistance R1 first ends connect LED load cold end, and resistance R1 second end connecting valve pipes M1 drain electrodes and amplifier U1 reverse phases are defeated
Enter end, amplifier U1 in-phase input ends receive first voltage, amplifier U1 output end connecting valve pipe M1 grids, and switching tube M1 source electrodes connect
Ground, electric current is I on resistance R1D=(VD-V1)/R1, IDFor the detection signal, VD is characterized, characterizes iLED.
As shown in fig. 6, current regulating module the first embodiment is illustrated, including the first current generating circuit U101 and
Two current generating circuit U102, the first current generating circuit U101 receive detection signal IDIt is described with first threshold IREF1
Second current generating circuit U102 receives detection signal IDWith second threshold IREF2, work as ID<When IREF1, the first electric current generates electricity
Road U101 exports the first electric current i01；Work as IDWhen >=IREF1, the first current generating circuit U101 not output currents；Work as ID>IREF2
When, the second current generating circuit exports the second electric current i02, works as IDWhen≤IREF2, the first current generating circuit U102 does not export electricity
Stream.
As shown in fig. 7, the first current generating circuit circuit diagram is illustrated, including the first current mirror U101 and the first base
Quasi- current source IREF1, the first reference current source IREF1 first ends connect power vd D, and it is defeated that second end connects the first current mirror U101
Entering end and detection signal generating circuit output end, the first reference current source IREF1 exports the first reference current IREF1, when
ID<When IREF1, the first current mirror U101 exports the first electric current i01, for the capacitance C02 electric discharges in ripple cancellation module.When
IDWhen >=IREF1, the first current mirror U101 not input and output electric currents.
As shown in figure 8, the second current generating circuit circuit diagram is illustrated, including the second current mirror U201 and the second base
Quasi- current source IREF2, the second reference current source IREF2 first ends connect power vd D, and it is defeated that second end connects the second current mirror U201
Enter end and detection signal generating circuit output end, the second reference current source IREF2 exports the second reference current IREF2, works as ID>
When IREF2, the second current mirror U201 exports the second electric current i02, for the capacitance C02 chargings in ripple cancellation module；Work as ID
When≤IREF2, the second current mirror U201 not input and output electric currents.
As shown in figure 9, second of embodiment of current regulating module is illustrated, including the first comparison circuit U101, the second ratio
Detection signal I is received compared with circuit U 102 and D/A converting circuit U103, the first comparison circuit U101DAnd first threshold
IREF1 exports the first comparison signal D1；The second comparison circuit U102 receives detection signal IDIt is defeated with second threshold IREF2
Go out the second comparison signal D2；The D/A converting circuit U103 receives the first comparison signal D1 and second comparison signal
D2 exports the first electric current i01 either the second electric current i02 or non-output current.Work as ID<When IREF1, the digital-to-analogue conversion electricity
Road U103 exports the first electric current i01；Work as ID>When IREF2, the D/A converting circuit U103 exports the second electric current i02, when
IREF1≤ID≤ IREF2, the D/A converting circuit U103 not output current.
Although embodiment is separately illustrated and is illustrated above, it is related to the common technology in part, in ordinary skill
Personnel apparently, can be replaced and integrate between the embodiments, be related to one of embodiment and the content recorded is not known, then
It can refer to another embodiment on the books.
Embodiments described above does not constitute the restriction to the technical solution protection domain.It is any in above-mentioned implementation
Modifications, equivalent substitutions and improvements etc., should be included in the protection model of the technical solution made by within the spirit and principle of mode
Within enclosing.
Claims (11)
1. a kind of ripple eliminates circuit, including：
Current regulating module, ripple cancellation module and detection signal generator module, the input terminal of the detection signal generator module
Connection load cold end, the detection signal of output end output characterization load cold end voltage, the current regulating module
Input terminal receive the detection signal, first threshold and second threshold, described in the output end of the current regulating module connects
The control terminal of ripple cancellation module, the ripple cancellation module and load in series；
When the detection signal is less than first threshold, load current reduces；
When the detection signal is more than second threshold, load current increases；
When the detection signal, which is more than or equal to first threshold, is less than or equal to second threshold, load current is constant.
2. ripple according to claim 1 eliminates circuit, it is characterised in that：When the detection signal is less than first threshold
When, the current regulating module exports the first electric current, and first electric current is for adjusting load current reduction；When the detection is believed
When number being more than second threshold, the current regulating module exports the second electric current, and second electric current is for adjusting load current increasing
Greatly；When the detection signal, which is more than or equal to first threshold, is less than or equal to second threshold, the current regulating module does not export electricity
Stream.
3. ripple according to claim 2 eliminates circuit, it is characterised in that：The current regulating module includes the first electric current
Generation circuit, first current generating circuit include the first current mirror and the first current source, first current source connection the
One current mirror input terminal and detection signal generator module output end, the first current source output current are the first threshold,
When the detection signal is less than first threshold, the first current mirror exports first electric current, when the detection signal more than etc.
When first threshold, the first current mirror not input and output electric current.
4. ripple according to claim 2 or 3 eliminates circuit, it is characterised in that：The current regulating module further includes
Two current generating circuits, second current generating circuit include the second current mirror and the second current source, second current source
One end connects the second current mirror input terminal and detects signal generator module output end, other end reception supply voltage, and described second
Current source output current is the second threshold, when the detection signal is more than second threshold, described in the output of the second current mirror
Second electric current, when the detection signal is less than or equal to second threshold, the second current mirror not input and output electric current.
5. ripple according to claim 1 eliminates circuit, it is characterised in that：The current regulating module compares including first
Circuit, the second comparison circuit and D/A converting circuit, first comparison circuit receive detection signal and first threshold, output the
One comparison signal；Second comparison circuit receives detection signal and second threshold, exports the second comparison signal；The digital-to-analogue turns
It changes circuit and receives first comparison signal and second comparison signal, export the first electric current either the second electric current or not defeated
Go out electric current；When the detection signal is less than first threshold, the D/A converting circuit exports first electric current, when the inspection
When surveying signal more than second threshold, the D/A converting circuit exports second electric current, when the detection signal is more than or equal to
When first threshold is less than or equal to second threshold, the D/A converting circuit not output current.
6. ripple according to claim 1 eliminates circuit, it is characterised in that：The ripple cancellation module includes the first capacitance
It is managed with adjustment, the first capacitance first end connects the current regulating module output end as ripple cancellation module control terminal,
Second end is grounded, and voltage is that ripple cancellation module controls terminal voltage on first capacitance, is denoted as first voltage；The adjustment pipe
And load in series；The first voltage is for driving the adjustment to manage, to adjust load current.
7. ripple according to claim 6 eliminates circuit, it is characterised in that：The ripple cancellation module further includes the first fortune
It puts and first resistor, the adjustment pipe first end connects the load cold end, and the adjustment pipe second end passes through described the
The connection of one resistance is on the ground, and the first amplifier first input end connects the first capacitance second end, first amplifier the
Two ends connect the common end of the adjustment pipe and the first resistor, and the first amplifier output end connects the adjustment management and control system
End.
8. the ripple described according to claim 6 or 7 eliminates circuit, it is characterised in that：When the sampled signal is more than the second threshold
When value, the current regulating module exports the second electric current to first capacitor charging, and the first voltage increases, load current
Increase；When the sampled signal is less than first threshold, the current regulating module exports the first electric current and is used for described first
Capacitance discharges, and the first voltage reduces, and load current declines；When the sampled signal be more than or equal to first threshold and less than etc.
When second threshold, the current regulating module not output current, the first voltage is constant, and load current is constant.
9. ripple according to claim 1 eliminates circuit, it is characterised in that：The detection signal generator module includes second
Amplifier, switching tube and second resistance, the second resistance first end connection load cold end, the second resistance second end connect
Switching tube first end is connect, the second amplifier first input end receives second voltage, the second input terminal of the second amplifier connection
The common end of the second resistance and the switching tube, the second amplifier output end connects the switch controlled end, described
Switching tube second end is grounded.
10. a kind of LED control circuit, it is characterised in that：Including any one in LED drive circuit and the above claim 1-9
Kind ripple eliminates circuit, and the LED drive circuit gives LED load power supply after receiving exchange input.
11. a kind of ripple removing method, it is characterised in that：The detection signal of characterization load cold end voltage is obtained, when described
When detecting signal less than first threshold, load current reduces；When the detection signal is more than second threshold, load current increases
Add；When the detection signal, which is more than or equal to first threshold, is less than or equal to second threshold, load current is constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810432782.4A CN108513408A (en) | 2018-05-08 | 2018-05-08 | Ripple eliminates circuit, ripple removing method and applies its LED control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810432782.4A CN108513408A (en) | 2018-05-08 | 2018-05-08 | Ripple eliminates circuit, ripple removing method and applies its LED control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN108513408A true CN108513408A (en) | 2018-09-07 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810432782.4A Pending CN108513408A (en) | 2018-05-08 | 2018-05-08 | Ripple eliminates circuit, ripple removing method and applies its LED control circuit |
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| CN109831844A (en) * | 2018-12-18 | 2019-05-31 | 陕西亚成微电子股份有限公司 | A kind of no stroboscopic High Power Factor LED driving method and circuit |
| CN110392467A (en) * | 2019-07-08 | 2019-10-29 | 杰华特微电子（杭州）有限公司 | LED control circuit and control method |
| CN112748756A (en) * | 2020-12-18 | 2021-05-04 | 珠海格力电器股份有限公司 | Power supply voltage ripple suppression method, device and control circuit |
| CN113346869A (en) * | 2021-04-27 | 2021-09-03 | 西安电子科技大学 | Efficient ripple suppression circuit applied to weak signal reading |
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| CN113346869A (en) * | 2021-04-27 | 2021-09-03 | 西安电子科技大学 | Efficient ripple suppression circuit applied to weak signal reading |
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Address after: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Applicant after: Jiehuate Microelectronics Co.,Ltd. Address before: Room 424, building 1, 1500 Wenyi West Road, Cangqian street, Yuhang District, Hangzhou City, Zhejiang Province Applicant before: JOULWATT TECHNOLOGY Inc.,Ltd. |