CN208369900U - Ripple eliminates circuit and the LED control circuit using it - Google Patents
Ripple eliminates circuit and the LED control circuit using it Download PDFInfo
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- CN208369900U CN208369900U CN201820679081.6U CN201820679081U CN208369900U CN 208369900 U CN208369900 U CN 208369900U CN 201820679081 U CN201820679081 U CN 201820679081U CN 208369900 U CN208369900 U CN 208369900U
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Abstract
Circuit is eliminated the utility model proposes a kind of ripple and using its LED control circuit, it includes current regulating module that the ripple, which eliminates circuit, ripple cancellation module and detection signal generator module, the input terminal connection load cold end of the detection signal generator module, the detection signal of its output end output characterization load cold end voltage, the input terminal of the current regulating module receives the detection signal, first threshold and second threshold, the output end of the current regulating module connects the control terminal of the ripple cancellation module, the ripple cancellation module and load in series.The utility model ripple eradicating efficacy is significant, and load current is more stable.
Description
Technical field
The utility model relates to field of power electronics, in particular to a kind of ripple is eliminated circuit and is controlled using its LED
Circuit.
Background technique
AC-DC conversion circuit more at present is converted to AC network input with positive raised line design by LED drive circuit
The dc power of wave exports, and LED is upper to have ripple, damages 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 Vreg is arranged, pulls up VC as VD>Vreg, when VD<Vreg at present
VC is drawn, can realize the control to LED ripple by adjusting the size of upper pull-down current i02, i01 and capacitor 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 to human eye, and the prior art can not solve this technical problem.
Utility model content
Circuit is eliminated the purpose of the utility model is to provide a kind of ripple for promoting ripple eradicating efficacy and using its LED
Control circuit, for solving the problems, such as LED current fluctuation of the existing technology.
To achieve the above object, the utility model provides a kind of ripple elimination circuit, comprising:
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 greater 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 greater than second threshold, the current regulating module is defeated
Second electric current out, second electric current is for adjusting load current increase；When the detection signal is small more than or equal to first threshold
When being equal to second threshold, the current regulating module does not export electric 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 electric current is 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 electric current is the second threshold, when the detection
When signal is greater 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 or the second electric current or does not export electric 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 greater 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 does not export electric current.
Optionally, the ripple cancellation module includes first capacitor and adjustment pipe, and the first capacitor 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 in the first capacitor
Wave cancellation module control 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 capacitor 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 greater than second threshold, the current regulating module exports the second electric current to institute
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 the first capacitor, 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 is not exported
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 connection switch 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 utility model also provides a kind of LED control circuit, including LED drive circuit and a kind of ripple of any of the above disappear
Except circuit, the LED drive circuit is powered after receiving exchange input to LED load.
Compared with prior art, the utility model has the advantage that the utility model in the detection signal less than
When one threshold value, load current reduces；When the detection signal is greater than second threshold, load current increases；When the detection is believed
Number be more than or equal to first threshold be less than or equal to second threshold when, load current is constant.The utility model control mode is simple and effective,
There is ripple to eliminate function, load current stability is good.
Detailed description of the invention
Fig. 1 is that prior art ripple eliminates circuit and the LED control circuit schematic diagram using it；
Fig. 2 is that the first ripple of the utility model eliminates circuit and the LED control circuit schematic diagram using it；
Fig. 3 is that second of ripple of the utility model eliminates circuit and the LED control circuit schematic diagram using it；
Fig. 4 (a) is the working principle diagram that the utility model ripple eliminates circuit；
Fig. 4 (b) is working principle diagram of the utility model under power grid Slight undulations；
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 embodiment
It is described in detail below in conjunction with preferred embodiment of the attached drawing to the utility model, but the utility model is not merely
It is limited to these embodiments.The utility model covers any substitution made in the spirit and scope of the utility model, modification, equivalent
Method and scheme.
In order to make the public have thorough understanding to the utility model, in following the preferred embodiment in the utility model specifically
Concrete details is illustrated, and that this can also be understood completely is practical new for description without these details for a person skilled in the art
Type.
The utility model is more specifically described by way of example referring to attached drawing in the following passage.It should be noted that attached drawing
It is all made of more simplified form and uses non-accurate ratio, only to facilitate, lucidly aid in illustrating the utility model
The purpose of embodiment.
As shown in Fig. 2, illustrating the first ripple of the utility model eliminates circuit and the LED control circuit principle using it
Figure, it includes detecting signal generator module U02, current regulating module U01 and ripple cancellation module that the ripple, which eliminates circuit, described
It detects signal generator module input terminal and connects LED load cold end, LED load cold end voltage is VD, and detection signal produces
Voltage VD is switched to the detection signal I for characterizing LED load electric current iLED by raw circuitD, the ripple cancellation module includes capacitor
C02 and adjustment pipe M01, the capacitor C02 first end connection current regulating module U01 output end and adjustment pipe M01 control terminal,
Voltage is first voltage VC on the capacitor C02, the capacitor C02 second end ground connection, the adjustment pipe M01 first end connection
LED load cold end, second end ground connection.
When voltage VD is greater than VDH, current regulating module U01 exports the second electric current i02 and is used to charge to capacitor C02, electricity
VC pull-up is pressed, LED load electric current increases, and voltage VD constantly drops below VDH；When voltage VD drops below VDL, electricity
It flowing adjustment module U01 and exports the first electric current i01 for discharging to capacitor C02, voltage VC is pulled down, LED load current reduction,
Voltage VD, which is continuously increased, is greater than VDL.Final voltage VD can stablize between VDL and VDH, and in this case, power grid has subtle
Fluctuation when, current regulating module does not also export electric current, and capacitor C02 does not have the movement of charge and discharge, thus voltage VC keep not
Become, so that LED load electric current iLED there will not be fluctuation.
As shown in figure 3, illustrating second of ripple of the utility model eliminates circuit and the LED control circuit principle using it
Figure, 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 electricity
R10 is hindered, the amplifier R10 non-inverting input terminal connects capacitor C02 first end, and inverting input terminal connects amplifier second end and resistance
R10 first end, resistance R10 second end ground connection.Since final voltage VD can stablize between VDL and VDH, capacitor C02 is not had
The movement of charge and discharge, voltage VC are remained unchanged, and voltage is constant on resistance R10, and load LED current iLED is constant.
As shown in Fig. 4 (a), illustrates the utility model ripple and eliminate circuit operation principle；As shown in Fig. 4 (b), illustrate
Working principle of the utility model under power grid Slight undulations when VD<VDL, generates discharge current i01 referring to Fig. 4 (a), and VD>
When VDH, charging current i02 is generated, VDL≤VD≤VDH does not generate electric current.Referring to Fig. 4 (b), when power grid has subtle fluctuation,
Capacitor C02 does not have the movement of charge and discharge, so voltage VC is remained unchanged, so that iLED there will not be fluctuation.
As shown in figure 5, illustrating detection signal generator module circuit diagram, including amplifier U1, switching tube M1 and resistance
R1, resistance R1 first end connect LED load cold end, and resistance R1 second end connection switch pipe M1 drain electrode and amplifier U1 reverse phase are defeated
Enter end, amplifier U1 non-inverting input terminal receives first voltage, amplifier U1 output end connection switch pipe M1 grid, and switching tube M1 source electrode connects
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, illustrating the first embodiment of current regulating module, 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 IDWhen < 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 does not export electric current；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 is not exported
Electric current.
As shown in fig. 7, illustrating the first current generating circuit circuit diagram, including the first current mirror U101 and first
Reference current source IREF1, the first reference current source IREF1 first end connect power vd D, and second end connects the first current mirror U101
Input terminal and detection signal generating circuit output end, the first reference current source IREF1 export the first reference current IREF1,
Work as IDWhen < IREF1, the first current mirror U101 exports the first electric current i01, for putting to the capacitor C02 in ripple cancellation module
Electricity.Work as IDWhen >=IREF1, the first current mirror U101 not input and output electric current.
As shown in figure 8, illustrating the second current generating circuit circuit diagram, including the second current mirror U201 and second
Reference current source IREF2, the second reference current source IREF2 first end connect power vd D, and second end connects the second current mirror U201
Input terminal and detection signal generating circuit output end, the second reference current source IREF2 export the second reference current IREF2, work as ID>
When IREF2, the second current mirror U201 exports the second electric current i02, for charging to the capacitor C02 in ripple cancellation module；Work as ID
When≤IREF2, the second current mirror U201 not input and output electric current.
As shown in figure 9, illustrating second of embodiment of current regulating module, 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
Second comparison signal D2 out；The D/A converting circuit U103 receives the first comparison signal D1 and second comparison signal
D2, the first electric current i01 of output perhaps the second electric current i02 or do not export electric current.Work as IDWhen < IREF1, the digital-to-analogue conversion electricity
Road U103 exports the first electric current i01；Work as IDWhen > IREF2, the D/A converting circuit U103 exports the second electric current i02, when
IREF1≤ID≤ IREF2, the D/A converting circuit U103 do not export electric 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 scope.It is any in above-mentioned implementation
Made modifications, equivalent substitutions and improvements etc., should be included in the protection model of the technical solution within the spirit and principle of mode
Within enclosing.
Claims (10)
1. a kind of ripple eliminates circuit, comprising:
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 greater 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 greater 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 electric current is the first threshold,
When the detection signal is less than first threshold, the first current mirror exports first electric current, when the detection signal greater 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 the
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
It is the second threshold that current source, which exports electric current, when the detection signal is greater 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 or the second electric current or not defeated
Electric current out；When the detection signal is less than first threshold, the D/A converting circuit exports first electric current, when the inspection
When surveying signal greater 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 does not export electric current.
6. ripple according to claim 1 eliminates circuit, it is characterised in that: the ripple cancellation module includes first capacitor
It is managed with adjustment, the first capacitor first end connects the current regulating module output end as ripple cancellation module control terminal,
Second end is grounded, and voltage is ripple cancellation module control terminal voltage in the first capacitor, 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 capacitor 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 control system
End.
8. ripple according to claim 6 or 7 eliminates circuit, it is characterised in that: when the sampled signal is greater than the second threshold
When value, the current regulating module exports the second electric current and charges to the first capacitor, 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
Capacitor electric discharge, the first voltage reduce, load current decline；When the sampled signal be more than or equal to first threshold and be less than etc.
When second threshold, the current regulating module does not export electric current, and 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 ground connection.
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820679081.6U CN208369900U (en) | 2018-05-08 | 2018-05-08 | Ripple eliminates circuit and the LED control circuit using it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820679081.6U CN208369900U (en) | 2018-05-08 | 2018-05-08 | Ripple eliminates circuit and the LED control circuit using it |
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| Publication Number | Publication Date |
|---|---|
| CN208369900U true CN208369900U (en) | 2019-01-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820679081.6U Active CN208369900U (en) | 2018-05-08 | 2018-05-08 | Ripple eliminates circuit and the LED control circuit using it |
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| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108513408A (en) * | 2018-05-08 | 2018-09-07 | 杰华特微电子（杭州）有限公司 | Ripple eliminates circuit, ripple removing method and applies its LED control circuit |
| CN110198583A (en) * | 2019-05-10 | 2019-09-03 | 杰华特微电子（杭州）有限公司 | LED drive circuit |
-
2018
- 2018-05-08 CN CN201820679081.6U patent/CN208369900U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108513408A (en) * | 2018-05-08 | 2018-09-07 | 杰华特微电子（杭州）有限公司 | Ripple eliminates circuit, ripple removing method and applies its LED control circuit |
| CN110198583A (en) * | 2019-05-10 | 2019-09-03 | 杰华特微电子（杭州）有限公司 | LED drive circuit |
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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 Patentee after: Jiehuate Microelectronics Co.,Ltd. Address before: Room 424, building 1, 1500 Wenyi West Road, Cangqian street, Yuhang District, Hangzhou City, Zhejiang Province Patentee before: JOULWATT TECHNOLOGY (HANGZHOU) Co.,Ltd. |
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