CN203313490U - LED current ripple elimination driving circuit - Google Patents
LED current ripple elimination driving circuit Download PDFInfo
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- CN203313490U CN203313490U CN2013203179118U CN201320317911U CN203313490U CN 203313490 U CN203313490 U CN 203313490U CN 2013203179118 U CN2013203179118 U CN 2013203179118U CN 201320317911 U CN201320317911 U CN 201320317911U CN 203313490 U CN203313490 U CN 203313490U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model discloses an LED current ripple elimination driving circuit comprising an input source, a wave-filtering capacitor and an LED load, wherein he LED load is connected with a switch tube, the source electrode of the switch tube is connected with a sampling resistor, and the gate pole of the switch tube is connected with the output end of an operational amplifier. When the input source is a current source containing ripples, the operational amplifier controls the switch tube by comparing a voltage signal of the sampling resistor with a dynamic reference voltage signal, and therefore the current of the LED load is enabled to be close to a direct current.
Description
Technical field
The utility model relates to a kind of LED drive circuit, relates in particular to a kind of LED current ripples and eliminates drive circuit.
Background technology
Fig. 1 is a kind of traditional rough schematic view that ripple LED constant-current drive circuit is arranged.As shown in Figure 1, comprise LED driver 10, one filter capacitor C1 and a LED load of a constant current output, this filter capacitor and LED load are directly in parallel.In order to realize High Power Factor, LED driver 10 output currents of described constant current output contain the composition of working frequency ripple wave, for example mains frequency is 50Hz, the LED driver output current of constant current output contains the ripple of 100Hz, voltage on filter capacitor C1 also has the ripple of 100Hz, equally, the electric current in the LED load also contains the ripple of 100Hz, makes light output contain the stroboscopic of 100Hz.Be in for a long time under the LED lamp of this low frequency stroboscopic and work, can cause people's visual fatigue, easily cause myopia.
The utility model content
The problems referred to above that exist for solving prior art, the utility model provide a kind of LED current ripples to eliminate drive circuit.
In order to realize above-mentioned utility model purpose, the open LED current ripples of the utility model is eliminated circuit, comprise: an input source, one filter capacitor and a LED load, this LED load connects a switching tube, the source class of this switching tube connects a sampling resistor, the gate pole of this switching tube connects the output of an operational amplifier, when this input source is one while comprising the current source of ripple, this operational amplifier is by voltage signal and a dynamic benchmark voltage signal on this sampling resistor relatively, controls the electric current that this switching tube makes this LED load and is close to a direct current electric current.
Further, this dynamic benchmark voltage signal is an integrating capacitor voltage signal.
Further, the gate pole of this switching tube or drain voltage signal are through a comparator and a threshold voltage signal compares and according to this comparative result conducting one switch, when this switch conduction, this integrating capacitor voltage signal descends, and this dynamic benchmark voltage signal descends.
Further, this integrating capacitor connects a charging circuit, and this charging circuit is a current source or resistance.
Further, this switch is in parallel with this integrating capacitor after with a leadage circuit, connecting.The position of this switch and this leadage circuit can exchange, and this switch is a variable current source, and this leadage circuit is a resistance or current source.
Further, this dynamic benchmark voltage signal is the integrating capacitor voltage signal after a ratio zooms in or out.
Further, this input source is inverse-excitation type switch power-supply, step-down switching power supply or buck Switching Power Supply.
Further, this switching tube is MOSFET pipe or BJT pipe.When this switching tube was the BJT pipe, the driving signal of this switching tube was current signal.
Compared with prior art, LED current ripples disclosed in the utility model is eliminated drive circuit, control intelligently the electric current of LED drive circuit, make electric current in the LED load equal the average current of input current source, make voltage on power switch equal the ripple composition of telling filter capacitor voltage, making the voltage in the LED load is the direct voltage of an approximate ripple-free, and the LED load current is the direct current of an approximate ripple-free, reaches the purpose that the LED current ripples is eliminated.
The accompanying drawing explanation
About advantage of the present utility model and spirit, can describe in detail and appended graphic being further understood by following utility model.
Fig. 1 is traditional High Power Factor LED constant-current drive circuit schematic diagram;
Fig. 2 eliminates the schematic diagram of drive circuit according to the shown LED current ripples of the utility model;
Fig. 3 is according to the shown circuit working typical waveform of the utility model figure;
Fig. 4 eliminates according to the shown LED current ripples of the utility model the schematic diagram that drive circuit uses the power switch drain electrode to control;
Fig. 5 is according to the shown anti-schematic diagram that structure High Power Factor LED current ripples is eliminated drive circuit that swashs of the utility model;
Fig. 6 eliminates the schematic diagram of drive circuit according to the shown buck configuration High Power Factor of the utility model LED current ripples;
Fig. 7 eliminates the schematic diagram of another execution mode of drive circuit according to the shown buck configuration High Power Factor of the utility model LED current ripples;
Fig. 8 eliminates the schematic diagram of drive circuit according to the shown buck structure of the utility model High Power Factor LED current ripples.
Embodiment
Below in conjunction with accompanying drawing, describe specific embodiment of the utility model in detail.
According to LED current ripples of the present utility model, eliminate drive circuit type of drive and the control mode of existing drive circuit have been made to improvement.
With reference to this LED current ripples, eliminate schematic diagram Fig. 2 of drive circuit.As shown in Figure 2, in LED drive circuit of the present utility model, LED load anode connects filter capacitor C1 anode.The drain D of power switch M1 connects the negative terminal of LED load.Sampling resistor R1 is connected in the source S of power switch M1.The reverse input end of operational amplifier 20 connects sampling resistor R1, and the output of operational amplifier connects the gate leve G of power switch M1.One input of comparator 30 is connected in gate leve G or the drain D of power switch M1, and another input of comparator 30 connects one and compares threshold voltage V1, and the output of comparator 20 connects a switch S 1.Switch S 1 is in parallel with an integrating capacitor C2 after with a leadage circuit R2, connecting, and a charging circuit 40 connects integrating capacitor C2.Voltage on integrating capacitor C2 is supplied with operational amplifier 20 in-phase input ends as dynamic benchmark signal ref after a proportional component 50.
Input source is the LED driver 10 with ripple current, such as active power is proofreaied and correct the LED constant-flow driver, contain the ripple composition of 2 times of mains frequencies, input current source is after filter capacitor filtering, on filter capacitor, produce a voltage, this voltage is also with the ripple of 2 times of mains frequencies.The purpose of this utility model is, eliminates the impact of this ripple on the LED load current, makes the LED load current realize very little working frequency ripple wave, realizes the purpose that the LED current ripples is eliminated.
Electric current in the LED load flows into the drain D of power switch M1, and flows out at the source class S of power switch M1, and the source class S electric current of power switch M1 flows through sampling resistor R1 and obtains a sampled voltage CS, and this voltage CS has reflected the size of LED load current.Operational amplifier 20 compares sampling resistor voltage CS and dynamic benchmark voltage ref, and the gate leve G of output signal power ratio control switch M1, closed-loop adjustment LED load current.The LED electric current is
, in formula,
For dynamic benchmark voltage,
For the sampling resistor value.
Also there is the ripple of 2 times of mains frequencies in the drain voltage D of power switch M1, and when drain D voltage was higher, above-mentioned loop can closed loop, and the LED electric current is a direct current signal.When drain voltage is low can't make above-mentioned loop closed loop the time, the output meeting of operational amplifier 20 is saturated, and gate leve voltage can be higher, simultaneously the LED electric current can be slightly lower than
.
The gate leve voltage signal of power switch M1 is sent to comparator 30 and a comparison threshold values V1 compares, when power switch M1 drain D voltage is low, above-mentioned loop has the some time in power frequency period can't closed loop, and gate leve voltage can, higher than threshold values relatively, illustrate that ripple appears in the LED electric current.Now comparator 30 outputs signal to switch, makes switch S 1 conducting, and the voltage drop on integrating capacitor C2 also makes dynamic benchmark voltage ref descend simultaneously, and the LED electric current is reduced.Because input source is a constant-current source with ripple, when the LED electric current reduces, input current can be greater than output current, make output filter capacitor C2 voltage rise, the leakage level D voltage of power switch M1 also can rise, thereby finally realize a voltage close loop control dynamic benchmark signal ref, making the LED load current is the direct current of an approximate ripple-free, makes simultaneously the power loss on power switch M1 be minimum.
In the present embodiment, this charging circuit 40 can be a current source, also can be a resistance.This switch S 1 can be a logic switch, also can be a variable current source.This leadage circuit R2 can be a resistance, also can be a current source.Switch S 1 and leadage circuit R2 position can exchange.Power switch pipe M1 is the MOSFET pipe, can be also the BJT pipe, and when this power switch was BJT, the driving signal was electric current.In another preferred embodiment, proportional component 50 can be omitted.
When Fig. 3 controls for the gate leve voltage signal that uses power switch, according to the shown circuit working typical waveform of the utility model.Voltage on output filter capacitor C1 contains the working frequency ripple wave of 2 times, output filter capacitor C1 voltage equals power switch M1 drain D voltage and LED load both end voltage sum, working frequency ripple wave on output filter capacitor C1 is transferred on the drain D of power switch M1, make the direct voltage of LED load both end voltage for approximate ripple-free, the electric current of LED load is also the direct current of an approximate ripple-free.Its mean value equals the average current of input current source.
Schematic diagram when Fig. 4 controls for the drain voltage that uses power switch.As shown in Figure 4, the drain D voltage signal of power switch M1 also can be compared that device 30 is used for and relatively threshold values V1 is relatively.When the drain D voltage signal, during lower than threshold values V1 relatively, reduce dynamic benchmark magnitude of voltage ref, the LED electric current is reduced, filter capacitor C1 voltage rises, and power switch M1 drain D voltage rises simultaneously.Thereby realize a voltage close loop control dynamic benchmark signal ref.Making the LED load current is the direct current of an approximate ripple-free, makes simultaneously the power loss on power switch M1 be minimum.
Fig. 5 is according to the shown anti-embodiment that structure High Power Factor LED current ripples is eliminated drive circuit that swashs of the utility model.LED current ripples disclosed in the utility model is eliminated drive circuit 15 as inverse-excitation type switch power-supply.
Fig. 6 eliminates an embodiment of drive circuit according to the shown buck configuration High Power Factor of the utility model LED current ripples.LED current ripples disclosed in the utility model is eliminated drive circuit 16 as the step-down switching power supply.
Fig. 7 eliminates another embodiment of drive circuit according to the shown buck configuration High Power Factor of the utility model LED current ripples.LED current ripples disclosed in the utility model is eliminated the another kind of connected mode of drive circuit 17 as the step-down switching power supply.
Fig. 8 eliminates an embodiment of drive circuit according to the shown buck structure of the utility model High Power Factor LED current ripples.LED current ripples disclosed in the utility model is eliminated drive circuit 18 as the buck Switching Power Supply.
Described in this specification is preferred embodiment of the present utility model, and above embodiment is only in order to the technical solution of the utility model to be described but not to restriction of the present utility model.All those skilled in the art comply with design of the present utility model by the available technical scheme of logical analysis, reasoning, or a limited experiment, all should be within scope of the present utility model.
Claims (10)
1. a LED current ripples is eliminated drive circuit, it is characterized in that, comprise: an input source, one filter capacitor and a LED load, described LED load connects a switching tube, the source class of described switching tube connects a sampling resistor, the gate pole of described switching tube connects the output of an operational amplifier, when described input source is one while comprising the current source of ripple, described operational amplifier, by voltage signal and a dynamic benchmark voltage signal on more described sampling resistor, is controlled described switching tube and is made the electric current of described LED load be close to a direct current electric current.
2. LED current ripples as claimed in claim 1 is eliminated drive circuit, it is characterized in that, described dynamic benchmark voltage signal is an integrating capacitor voltage signal.
3. LED current ripples as claimed in claim 2 is eliminated drive circuit, it is characterized in that, the gate pole of described switching tube or drain voltage signal are through a comparator and a threshold voltage signal compares and according to described comparative result conducting one switch, when described switch conduction, described integrating capacitor voltage signal descends, and described dynamic benchmark voltage signal descends.
4. LED current ripples as claimed in claim 2 is eliminated drive circuit, it is characterized in that, described integrating capacitor connects a charging circuit, and described charging circuit is a current source or resistance.
5. LED current ripples as claimed in claim 3 is eliminated drive circuit, it is characterized in that, described switch is in parallel with described integrating capacitor after with a leadage circuit, connecting.
6. LED current ripples as claimed in claim 5 is eliminated drive circuit, it is characterized in that, the position of described switch and described leadage circuit can exchange, and described switch is a variable current source, and described leadage circuit is a resistance or current source.
7. LED current ripples as claimed in claim 2 is eliminated drive circuit, it is characterized in that, described dynamic benchmark voltage signal is the integrating capacitor voltage signal after a ratio zooms in or out.
8. LED current ripples as claimed in claim 1 is eliminated drive circuit, it is characterized in that, described input source is inverse-excitation type switch power-supply, step-down switching power supply or buck Switching Power Supply.
9. LED current ripples as claimed in claim 1 is eliminated drive circuit, it is characterized in that, described switching tube is MOSFET pipe or BJT pipe.
10. LED current ripples as claimed in claim 9 is eliminated drive circuit, it is characterized in that, when described switching tube was the BJT pipe, the driving signal of described switching tube was current signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203179118U CN203313490U (en) | 2013-06-04 | 2013-06-04 | LED current ripple elimination driving circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203179118U CN203313490U (en) | 2013-06-04 | 2013-06-04 | LED current ripple elimination driving circuit |
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| CN203313490U true CN203313490U (en) | 2013-11-27 |
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| CN2013203179118U Expired - Lifetime CN203313490U (en) | 2013-06-04 | 2013-06-04 | LED current ripple elimination driving circuit |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103269550A (en) * | 2013-06-04 | 2013-08-28 | 上海晶丰明源半导体有限公司 | LED ((Light Emitting Diode) current ripple elimination driving circuit |
| CN103813596A (en) * | 2014-03-10 | 2014-05-21 | 杭州士兰微电子股份有限公司 | LED (Light-Emitting Diode) driving circuit and method for reducing LED current ripple |
| CN104470096A (en) * | 2014-11-26 | 2015-03-25 | 成都岷创科技有限公司 | LED driving circuit |
| CN106332376A (en) * | 2016-10-26 | 2017-01-11 | 杰华特微电子（张家港）有限公司 | Ripple wave eliminating circuit and LED (light-emitting diode) control circuit |
| 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 |
| WO2018014878A1 (en) * | 2016-07-22 | 2018-01-25 | 得能创科有限公司 | Universal led drive controller |
| 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 |
-
2013
- 2013-06-04 CN CN2013203179118U patent/CN203313490U/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103269550A (en) * | 2013-06-04 | 2013-08-28 | 上海晶丰明源半导体有限公司 | LED ((Light Emitting Diode) current ripple elimination driving circuit |
| CN103813596A (en) * | 2014-03-10 | 2014-05-21 | 杭州士兰微电子股份有限公司 | LED (Light-Emitting Diode) driving circuit and method for reducing LED current ripple |
| CN104470096A (en) * | 2014-11-26 | 2015-03-25 | 成都岷创科技有限公司 | LED driving circuit |
| WO2018014878A1 (en) * | 2016-07-22 | 2018-01-25 | 得能创科有限公司 | Universal led drive controller |
| CN107645803A (en) * | 2016-07-22 | 2018-01-30 | 得能创科有限公司 | A kind of omnipotent LED drive control devices |
| CN107645803B (en) * | 2016-07-22 | 2019-04-12 | 得能创科有限公司 | A kind of omnipotent LED drive control device |
| CN106332376A (en) * | 2016-10-26 | 2017-01-11 | 杰华特微电子（张家港）有限公司 | Ripple wave eliminating circuit and LED (light-emitting diode) control circuit |
| CN106332376B (en) * | 2016-10-26 | 2017-12-19 | 杰华特微电子（张家港）有限公司 | Ripple eliminates circuit and LED control circuit |
| 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 |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 5 room 504-511, room 2, Lane 666, Zhang Heng Road, Pudong New Area, China (Shanghai) free trade zone, Shanghai, China () Patentee after: SHANGHAI BRIGHT POWER SEMICONDUCTOR Co.,Ltd. Address before: 201204 Shanghai city Pudong New Area in 299 Lane Road, No. 10 Patentee before: Shanghai Bright Power Semiconductor Co.,Ltd. |
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| CP03 | Change of name, title or address | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131127 |
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| CX01 | Expiry of patent term |