CN203691702U - Line voltage compensation AC LED drive device - Google Patents
Line voltage compensation AC LED drive device Download PDFInfo
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- CN203691702U CN203691702U CN201320879922.5U CN201320879922U CN203691702U CN 203691702 U CN203691702 U CN 203691702U CN 201320879922 U CN201320879922 U CN 201320879922U CN 203691702 U CN203691702 U CN 203691702U
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- 239000003990 capacitor Substances 0.000 description 12
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- 230000001105 regulatory effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
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- 238000001514 detection method Methods 0.000 description 1
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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 a line voltage compensation AC LED drive device which includes a line voltage compensation module and an AC LED drive module; the line voltage compensation module detects an output voltage of a rectifier bridge; according to changes of the output voltage of the rectifier bridge, corresponding line voltage compensation reference voltages are outputted to the AC LED drive module; and the AC LED drive module according to the line voltage compensation reference voltages adjusts in a real-time manner a drive current, so that an output power remains constant. According to the utility model, the line voltage compensation module detects the output voltage of the rectifier bridge; according to the changes of the output voltage of the rectifier bridge, corresponding line voltage compensation reference voltages are outputted to the AC LED drive module; the AC LED drive module according to the line voltage compensation reference voltages adjusts in a real-time manner a drive current, so that an output power remains constant, and the outputted luminous flux of the lamp is basically unchanged; the brightness of the LED lamp is stable; and the voltage flicker of the LED lamp is eliminated.
Description
Technical field
The utility model relates to electronic equipment, relates in particular to a kind of line voltage compensation AC LED drive unit.
Background technology
At present, LED(Light-Emitting Diode, light-emitting diode) light fixture is very general at lighting field, AC LED drive chip LED light fixture in application also more extensive.Segmented AC LED of the prior art drives chip, and its power output can fluctuate along with the fluctuation of line voltage, thereby the luminous flux of its output also can fluctuate thereupon.In the occasion of the frequent switch of large power-consuming equipment, can there is certain variation in line voltage in scope very by a small margin, thereby cause that flickering phenomenon appears in AC LED light fixture, causes discomfort to human eye.Therefore, there is defect in the type of drive of existing AC LED, is badly in need of improvement and bring new ideas.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art part, the purpose of this utility model is to provide a kind of line voltage compensation AC LED drive unit, adopt line voltage compensation technology to regulate the drive current of AC LED driver module, can make the output light flux of light fixture substantially remain unchanged.
In order to achieve the above object, the utility model has been taked following technical scheme:
A kind of line voltage compensation AC LED drive unit, be connected between rectifier bridge and LED lamp group, comprise line voltage compensation module and AC LED driver module, described line voltage compensation module detects the output voltage of rectifier bridge, export corresponding line voltage compensation reference voltage to AC LED driver module according to the variation of rectifier bridge output voltage, described AC LED driver module regulates drive current in real time according to described line voltage compensation reference voltage, and power output is remained unchanged.
In described line voltage compensation AC LED drive unit, described line voltage compensation module comprises division module, reference voltage output module, peak value sampling module and subtraction block; After the voltage dividing potential drop that described division module is exported rectifier bridge, export to peak value sampling module, peak value sampling module is exported to subtraction block after to voltage sample, described subtraction block is carried out subtraction, output line voltage compensate for reference voltage by the reference voltage of the sampled voltage of peak value sampling module output and the output of reference voltage output module.
In described line voltage compensation AC LED drive unit, described division module comprises the first resistance and the second resistance, one end of described the first resistance connects rectifier bridge, and the other end of the first resistance connects one end of peak value sampling module and the second resistance, the other end ground connection of described the second resistance.
Described line voltage compensation AC LED drive unit, also comprises storage/discharge module, for storing the crest voltage of peak value sampling module output, and the electric weight of its storage of release before arriving in the next commutation cycle.
In described line voltage compensation AC LED drive unit, described storage/discharge module comprises the first electric capacity and the 3rd resistance, and one end of described the first electric capacity connects peak value sampling module and subtraction block, the other end ground connection of the first electric capacity; Described the 3rd resistance is attempted by the two ends of described the first electric capacity.
Compared to prior art, the line voltage compensation AC LED drive unit that the utility model provides, detect the output voltage of rectifier bridge by line voltage compensation module, export corresponding line voltage compensation reference voltage to AC LED driver module according to the variation of rectifier bridge output voltage, described AC LED driver module regulates drive current in real time according to described line voltage compensation reference voltage, power output is remained unchanged, can make the output light flux of light fixture substantially constant, thereby make the brightness stability of LED, eliminated the flickering of LED light fixture.
Accompanying drawing explanation
The structured flowchart of the line voltage compensation AC LED drive unit that Fig. 1 provides for the utility model.
Fig. 2 a is traditional AC LED control circuit power output and the graph of a relation of voltage.
Line voltage compensation AC LED drive unit output current and voltage relationship figure that Fig. 2 b provides for the utility model.
Line voltage compensation AC LED drive unit power output and voltage relationship figure that Fig. 2 c provides for the utility model.
Embodiment
The utility model provides a kind of line voltage compensation AC LED drive unit, adopt line voltage compensation technology, can, in the time that fluctuation appears in line voltage, regulate drive current, power output is remained unchanged substantially, and then reach the object that LED light fixture there will not be voltage flicker.
For making the purpose of this utility model, technical scheme and effect clearer, clear and definite, referring to the accompanying drawing embodiment that develops simultaneously, the utility model is further described.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Refer to Fig. 1, the structured flowchart of its line voltage compensation AC LED drive unit providing for the utility model.As shown in Figure 1, line voltage compensation AC LED drive unit of the present utility model is connected between rectifier bridge 300 and LED lamp group 400, comprise: line voltage compensation module 100 and AC LED driver module 200, described line voltage compensation module 100 connects AC LED driver module 200 and rectifier bridge 300, and described AC LED driver module 200 connects rectifier bridge 300 and LED lamp group 400.
Wherein, described line voltage compensation module 100, for detection of the output voltage of rectifier bridge 300, is exported corresponding line voltage compensation reference voltage to AC LED driver module 200 according to the variation of rectifier bridge 300 output voltages; Described AC LED driver module 200 regulates drive current in real time according to described line voltage compensation reference voltage, and power output is remained unchanged, thereby the LED brightness in LED lamp group is remained unchanged substantially.For example, in the time of large power-consuming equipment switch, line voltage can have a fluctuation more by a small margin in a short period of time, now line voltage compensation module 100 will detect the change in voltage of line voltage and then generate line voltage compensation reference voltage to AC LED driver module 200, now AC LED driver module 200 can regulate drive current in real time according to line voltage compensation reference voltage, keeps power output constant.
Please continue to refer to Fig. 1, described line voltage compensation module 100 specifically comprises: division module 110, reference voltage output module 120, peak value sampling module 130 and subtraction block 140.Described line voltage compensation module 100 can be integrated in chip piece, also can be integrated in AC LED driver module 200 chips.
Described division module 110 connects the input of described rectifier bridge 300 and peak value sampling module 130, for exporting to peak value sampling module 130 after the voltage dividing potential drop that rectifier bridge is exported.The output of described reference voltage output module 120 is connected the input of subtraction block 140 with the output of peak value sampling module 130, the output of subtraction block 140 connects the input of AC LED driver module 200.Described peak value sampling module 130 is for exporting to subtraction block 140 by the data after voltage sample, the reference voltage that described subtraction block 140 is exported for sampled voltage that described peak value sampling module 130 is exported and reference voltage output module 120 carries out subtraction, and output line voltage compensate for reference voltage is to AC LED driver module 200.Now, the effective value of AC LED driver module 200 output currents changes along with the change of the peak value of input line voltage, thereby the power output of LED lamp group is remained unchanged, to eliminate the phenomenon of LED light fixture flickering.
When concrete enforcement, described division module 110 comprises the first resistance R 1 and the second resistance R 2, one end of described the first resistance R 1 connects the other end connection peak value sampling module 130 of rectifier bridge 300, the first resistance R 1 and one end of the second resistance R 2, the other end ground connection of described the second resistance R 2.The present embodiment can be by regulating the resistance value ratio of the first resistance R 1 and the second resistance R 2 can regulate the slope of line voltage compensation reference voltage with respect to line voltage, thereby control the electric current of LED wick with respect to the slope of line voltage, thereby make line voltage compensation AC LED drive unit can compensate power output, make its relative line voltage change and change.
For the crest voltage of each voltage cycle of accurately sampling, the drive unit that the utility model provides also comprises storage/discharge module 150, for storing the crest voltage that peak value sampling module 130 is exported, and the electric weight of its storage of release before arriving in the next commutation cycle, can store the crest voltage of next commutation cycle.
Concrete, described storage/discharge module 150 comprises the first capacitor C 1 and the 3rd resistance R 3, one end of described the first capacitor C 1 connects the other end ground connection of peak value sampling module 130 and subtraction block 140, the first capacitor C 1; Described the 3rd resistance R 3 is attempted by the two ends of described the first capacitor C 1.
In the present embodiment, input city voltage is after the first resistance R 1 and the second resistance R 2 dividing potential drops, be input to peak value sampling module 130, peak value sampling module 130 is stored in crest voltage in the first capacitor C 1, described the 3rd resistance R 3 is discharge resistance, be responsible for the charge discharging resisting in storage the first capacitor C 1, for interim in the next commutation cycle, refresh the electric weight that the first capacitor C 1 is stored, prevent in the time that next crest arrives the overtension of storage in the first capacitor C 1 to such an extent as to can not normally sample the voltage of input civil power.If there is no the 3rd resistance R 3, if when the voltage peak of next commutation cycle is less than the voltage peak of a commutation cycle, in the first capacitor C 1, can keep the peak value of a upper commutation cycle, thereby can cause the sampled voltage of peak value sampling module 130 to be made mistakes, cause correctly output line voltage compensate for reference voltage of subtraction block 140.
Further, in above-described line voltage compensation AC LED drive unit, the line voltage compensation reference voltage that described subtraction block 140 is exported is:
Wherein, V1 is the reference voltage that reference voltage output module 120 is exported, the crest voltage that Vac is electric main, R1 is the resistance of the first resistance R 1, R2 is the resistance of the second resistance R 2, and K is the discharge coefficient of storage/discharge module 150, is specially the discharge coefficient of the first capacitor C 1.
When concrete enforcement, in adjacent two cycles, doubly, in this, M is one and is less than 1 number the M of the peak value that the mean value in the first capacitor C 1 is rectifier output voltage.For example, generally, the fluctuation of line voltage is ± 10% left and right, now, leave certain allowance, guarantees can respond ± 15% mains fluctuation of peak value sampling module 130.The cycle maximum of supposing input civil power is Tmax, and the time constant value in the RC loop of the formation of the 3rd resistance R 3 and the first capacitor C 1 should be set to 0.52Tmax.In the case, the value of K is about 0.925.
Below in conjunction with Fig. 2 a-Fig. 2 c, drive the power output of chip and the power output that the utility model carries out after line voltage compensation to contrast traditional AC LED, line voltage compensation AC LED drive unit of the present utility model is elaborated:
As shown in Figure 2 a, when traditional AC LED control circuit does not adopt line voltage compensation circuit, its power output can change in the same way along with the fluctuation of input line voltage, within the scope of certain line voltage, for example, in city's voltage range of 200V ~ 240V, the slope that power output changes with respect to input voltage is fixed.So in the time that fluctuation appears in line voltage, its power output can fluctuate, and makes LED light fixture occur flickering phenomenon thereupon.
Variation diagram between the line voltage compensation AC LED drive unit output current that Fig. 2 b provides for the utility model and voltage.As shown in Figure 2 b, the drive unit that the utility model provides can be controlled electric current in the LED wick slope with respect to line voltage, thereby make the output current of line voltage compensation AC LED drive unit can compensate the variation of power output with respect to line voltage, the power output of line voltage compensation AC LED drive unit is substantially remained unchanged in certain voltage range, thereby the luminous flux that guarantees light fixture output is substantially constant, reach the effect of eliminating voltage sudden strain of a muscle limit, line voltage compensation AC LED drive unit carries out after line voltage compensation, the power output of AC LED driver module as shown in Figure 2 c.
The present embodiment can be by regulating the ratio of the first resistance R 1 and the second resistance R 2, regulate the slope of line voltage compensation reference voltage with respect to line voltage, thereby the electric current in control LED wick is with respect to the slope of line voltage, thereby make line voltage compensation AC LED drive current can compensate the variation of power output with respect to line voltage, the power output of line voltage compensation AC LED drive unit is substantially remained unchanged in certain voltage range, thereby the output light flux that guarantees light fixture is substantially constant, reach the effect of eliminating voltage flicker.
Be understandable that; for those of ordinary skills; can be equal to replacement or change according to the technical solution of the utility model and utility model design thereof, and all these changes or replacement all should belong to the protection range of the appended claim of the utility model.
Claims (5)
1. a line voltage compensation AC LED drive unit, be connected between rectifier bridge and LED lamp group, it is characterized in that, comprise line voltage compensation module and AC LED driver module, described line voltage compensation module detects the output voltage of rectifier bridge, export corresponding line voltage compensation reference voltage to AC LED driver module according to the variation of rectifier bridge output voltage, described AC LED driver module regulates drive current in real time according to described line voltage compensation reference voltage, and power output is remained unchanged.
2. line voltage compensation AC LED drive unit according to claim 1, is characterized in that, described line voltage compensation module comprises division module, reference voltage output module, peak value sampling module and subtraction block; After the voltage dividing potential drop that described division module is exported rectifier bridge, export to peak value sampling module, peak value sampling module is exported to subtraction block after to voltage sample, described subtraction block is carried out subtraction, output line voltage compensate for reference voltage by the reference voltage of the sampled voltage of peak value sampling module output and the output of reference voltage output module.
3. line voltage compensation AC LED drive unit according to claim 2, it is characterized in that, described division module comprises the first resistance and the second resistance, one end of described the first resistance connects rectifier bridge, the other end of the first resistance connects one end of peak value sampling module and the second resistance, the other end ground connection of described the second resistance.
4. line voltage compensation AC LED drive unit according to claim 3, is characterized in that, also comprises storage/discharge module, for storing the crest voltage of peak value sampling module output, and the electric weight of its storage of release before arriving in the next commutation cycle.
5. line voltage compensation AC LED drive unit according to claim 4, it is characterized in that, described storage/discharge module comprises the first electric capacity and the 3rd resistance, and one end of described the first electric capacity connects peak value sampling module and subtraction block, the other end ground connection of the first electric capacity; Described the 3rd resistance is attempted by the two ends of described the first electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320879922.5U CN203691702U (en) | 2013-12-30 | 2013-12-30 | Line voltage compensation AC LED drive device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320879922.5U CN203691702U (en) | 2013-12-30 | 2013-12-30 | Line voltage compensation AC LED drive device |
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| Publication Number | Publication Date |
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| CN203691702U true CN203691702U (en) | 2014-07-02 |
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| CN201320879922.5U Expired - Lifetime CN203691702U (en) | 2013-12-30 | 2013-12-30 | Line voltage compensation AC LED drive device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015101154A1 (en) * | 2013-12-30 | 2015-07-09 | 深圳市晟碟绿色集成科技有限公司 | Line voltage compensation ac led driving device |
| US10201048B2 (en) | 2015-08-13 | 2019-02-05 | Silicon Works Co., Ltd. | Lighting apparatus |
-
2013
- 2013-12-30 CN CN201320879922.5U patent/CN203691702U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015101154A1 (en) * | 2013-12-30 | 2015-07-09 | 深圳市晟碟绿色集成科技有限公司 | Line voltage compensation ac led driving device |
| US9832822B2 (en) | 2013-12-30 | 2017-11-28 | Shenzhen Sendis Green Power Integrations Technology Corporation | Line voltage compensation AC LED driving device |
| US10201048B2 (en) | 2015-08-13 | 2019-02-05 | Silicon Works Co., Ltd. | Lighting apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170328 Address after: 518000 Guangdong, Shenzhen, Zhongshan, Garden Road, No. 1001 international E city D1 Dong 2D Patentee after: SHENZHEN SENDIS SEMICONDUCTOR Co.,Ltd. Address before: 518000 Guangdong, Shenzhen, Zhongshan, Garden Road, No. 1001 international E city D1 Dong 2D Patentee before: SHENZHEN SENDIS GREEN POWER INTEGRATIONS TECHNOLOGY Corp. |
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| TR01 | Transfer of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140702 |
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| CX01 | Expiry of patent term |