CN204795736U - LED segmentation constant current drive lighting device - Google Patents
LED segmentation constant current drive lighting device Download PDFInfo
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- CN204795736U CN204795736U CN201520441789.4U CN201520441789U CN204795736U CN 204795736 U CN204795736 U CN 204795736U CN 201520441789 U CN201520441789 U CN 201520441789U CN 204795736 U CN204795736 U CN 204795736U
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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
Abstract
The utility model discloses a LED segmentation constant current drive lighting device, including rectifier module, constant -current module and segmentation drive module, constant -current module connection rectifier module and LED banks, segmentation drive module connects rectifier module, constant -current module and LED banks, rectifier module carries out the rectification to the commercial power and becomes the rectified alternating current source, constant -current module restricts output current at predetermined continuous current within range when mains voltage is undulant, can not cause LED to bear too big electric current in the arbitrary section of one -period because of the change of voltage, and reduce LED's life -span, the life -span of effectively having improved LED, the segmentation drive module segment to light or go out to the LED banks according to mains voltage's size, and one section at least LED lamp cluster of control is lighted when mains voltage reduces promptly, makes LED all go out in the time of can the low -voltage appearing in the cycle because of the commercial power, has saved power filter circuit, has improved power factor, and its component count is few, and is with low costs, safe power saving.
Description
Technical field
The utility model relates to LED Driving technique field, and particularly a kind of LED multi-stage constant current drives lighting device.
Background technology
Existing low-power LED illumination drive circuit kind is more, usually first through current rectifying and wave filtering circuit rectifying and wave-filtering, again by resistance current limliting rear drive LED, to reduce costs.This structure is at civil power crest voltage place, and the electric current flowing through LED can be caused far to exceed its default continuous current scope, and LED is easy to light decay, and the power factor of driving power is lower.And the filter capacitor in circuit is very easily subject to the impact of temperature and damages, and greatly reduces life-span and the reliability of driving power, adds maintenance and repair expense in the future., and 0.7 times of civil power 50 degree of magnitudes of voltage only peak voltage, this circuit cannot driving LED further.Although some producers adopt constant current chip and power factor compensation circuit to solve the problems referred to above, cost has increased substantially.
In view of this, the utility model provides a kind of LED multi-stage constant current to drive lighting device.
Utility model content
In view of above-mentioned the deficiencies in the prior art part, the purpose of this utility model is to provide a kind of LED multi-stage constant current to drive lighting device, can exceed default continuous current scope and the low problem of power factor with the output current solving existing LED illumination drive circuit.
In order to achieve the above object, the utility model takes following technical scheme:
A kind of LED multi-stage constant current drives lighting device, and be connected with LED group, described LED group comprises three sections of LED strings of series connection, and wherein, described LED multi-stage constant current drives lighting device to comprise:
For carrying out to civil power the rectification module that rectification becomes Voltage pulsating direct-current supply;
For output current being limited in when mains fluctuations the constant flow module within the scope of default continuous current;
Light for carrying out segmentation according to the size of supply voltage to LED group or extinguish, and controlling the drive part by part module that at least one section of LED string light when supply voltage reduces;
Described constant flow module connects rectification module and LED group, described drive part by part model calling rectification module, constant flow module and LED group.
Described LED multi-stage constant current drives in lighting device, and described LED group comprises first paragraph LED string, second segment LED string and the 3rd section of LED string; Described drive part by part module comprises the first driver element and the second driver element;
The input of described first driver element connects rectification module and constant flow module, the output of the first driver element connects the negative pole of first paragraph LED string and the positive pole of second segment LED string, the input of the second driver element connects the input of rectification module, constant flow module and the first driver element, the output of the second driver element connects the negative pole of second segment LED string and the positive pole of the 3rd section of LED string, the minus earth of the 3rd section of LED string.
Described LED multi-stage constant current drives in lighting device, and described constant flow module comprises the first resistance, the second resistance, the 3rd resistance, the first triode and the second triode; The base stage of described first triode connects one end of the second resistance and the collector electrode of the second triode, the collector electrode of the first triode connects the 2nd pin of one end of the first resistance, the other end of the second resistance and rectification module, the emitter of the first triode connects the other end of the first resistance, one end of the 3rd resistance and the base stage of the second triode, and the other end of described 3rd resistance connects the emitter of the second triode and the positive pole of first paragraph LED string.
Described LED multi-stage constant current drives in lighting device, and described first driver element comprises the 3rd triode, the 4th triode, the 4th resistance, the 5th resistance and the 6th resistance; The base stage of described 3rd triode connects one end of the 5th resistance and one end of the 6th resistance, the collector electrode of the 3rd triode connects one end of the 4th resistance and the base stage of the 4th triode, the emitter of the 3rd triode connects the other end of the 6th resistance, the emitter of the 4th triode and ground, the other end of described 4th resistance connects the 2nd pin of the other end of the 5th resistance, the other end of the second resistance and rectification module, and the collector electrode of the 4th triode connects the negative pole of first paragraph LED string and the positive pole of second segment LED string.
Described LED multi-stage constant current drives in lighting device, and described second driver element comprises the 5th triode, the 6th triode, the 7th resistance, the 8th resistance and the 9th resistance; The base stage of described 5th triode connects one end of the 8th resistance and one end of the 9th resistance, the collector electrode of the 5th triode connects one end of the 7th resistance and the base stage of the 6th triode, the other end of the 7th resistance connects the 2nd pin of the other end of the 8th resistance, the other end of the 4th resistance and rectification module, and the collector electrode of the 6th triode connects the negative pole of second segment LED string and the positive pole of the 3rd section of LED string; The equal ground connection of negative pole of the emitter of the 5th triode, the emitter of the 6th triode and the 3rd section of LED string.
Compared to prior art, the LED multi-stage constant current that the utility model provides drives lighting device, carries out rectification become Voltage pulsating direct-current supply by rectification module to civil power; Output current is limited within the scope of default continuous current when mains fluctuations by constant flow module, LED will be caused to bear excessive electric current in any section of one-period because of the variation of voltage, and reduce the life-span of LED, effectively improve the life-span of LED; Drive part by part module is carried out segmentation according to the size of supply voltage to LED group and is lighted or extinguish, namely control at least one section of LED string to light when supply voltage reduces, can not because making LED all extinguish when there is low-voltage in the civil power cycle, effectively improve power factor and the power-efficient of driving power, the high efficiency achieving the energy utilizes; Eliminate electric source filter circuit, do not use electrochemical capacitor, its power factor is high, number of elements is few, and cost is low, safe and power saving, meet the title of LED " green illumination ", be suitable for direct city electrically driven (operated) serial connection LED illumination electricity-saving lamp, the especially LED daylight lamp of 10W ~ 20W.
Accompanying drawing explanation
The structured flowchart of the LED multi-stage constant current driving lighting device that Fig. 1 provides for the utility model embodiment;
The circuit diagram of the LED multi-stage constant current driving lighting device Application Example that Fig. 2 provides for the utility model embodiment.
Embodiment
The utility model provides a kind of LED multi-stage constant current to drive lighting device, in existing low-power LED drive circuit, increase the constant flow module be made up of discrete component and drive part by part module.For making the purpose of this utility model, technical scheme and effect clearly, clearly, referring to the accompanying drawing embodiment that develops simultaneously, the utility model is further described.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Please refer to Fig. 1 and Fig. 2, the LED multi-stage constant current that the utility model embodiment provides drives lighting device for driving LED lamp group.Described LED group is made up of three sections of LED strings of connecting, and every section of LED string has been connected several LED.Described LED multi-stage constant current drives lighting device to comprise rectification module 100, constant flow module 200 and drive part by part module 300.
Described rectification module 100 pairs of civil powers carry out rectification and become Voltage pulsating direct-current supply, and the size of supply voltage synchronously changes with line voltage.Described constant flow module 200 connects rectification module 100 and LED group, be specially be serially connected in rectification module 100 and LED group positive pole between, for output current being limited within the scope of default continuous current when mains fluctuations, be specially: the increase suppressing output current when the crest voltage of supply voltage becomes large, thus make output current be no more than default continuous current, LED would not be caused to bear excessive electric current in any section of one-period because of the variation of voltage like this, and reduce the life-span of LED, effectively improve the life-span of LED, enhance power-supply system reliability.
Described drive part by part module 300 connects rectification module 100, constant flow module 200 and LED group, can carry out segmentation light or extinguish according to the size of supply voltage to LED group, guarantees that at least one section of LED string is lighted when supply voltage reduces; Be specially when mains voltage waveform rises by 0, LED group is lighted piecemeal; When mains voltage waveform is near peak value, LED group is all lighted, and continue to decline when supply voltage drops to first threshold, LED group starts to extinguish piecemeal, and at least one section of LED string keeps lighting.Because making LED all extinguish when there is low-voltage in the civil power cycle, can not effectively improve power factor and the power-efficient of driving power, the high efficiency achieving the energy utilizes; Priorly be omitted existing electric source filter circuit, do not use electrochemical capacitor, improve the life-span of overall driving power, guarantee that realizing LED multi-stage constant current with least cost drives.
Be some sections of LED strings based on LED component, in a preferred application embodiment, arranging LED component is three sections, comprises first paragraph LED string L1, second segment LED string L2 and the 3rd section LED string L3.Accordingly, described drive part by part module 300 comprises the first driver element 3011 and the second driver element 3012.The input i1 of described first driver element 3011 connects rectification module and constant flow module, the output o1 of the first driver element 3011 connects the negative pole of first paragraph LED string L1 and the positive pole of second segment LED string L2, the input i2 of the second driver element 3012 connects the input i1 of rectification module, constant flow module and the first driver element 3011, the output o2 of the second driver element 3012 connects the negative pole of second segment LED string L2 and the positive pole of the 3rd section of LED string L3, the minus earth of the 3rd section of LED string L3.
One section of LED string is represented with the electronic chart of a light-emitting diode in several LED, Fig. 2 it is to be appreciated that connected in every section of LED string.If the hop count of LED string changes, the number of driver element changes thereupon.
Please continue to refer to Fig. 2, in the present embodiment, described rectification module 100 adopts rectifier bridge, it is prior art, 1st pin of rectification module 100 connects live wire end L, 2nd pin of rectification module 100 connects constant flow module 200 and drive part by part module 300, and the 3rd pin of rectification module 100 connects zero line side n, the 4th pin ground connection of rectification module 100.Wherein, the rectifier bridge rectification of civil power in rectification module 100 of the 220V of live wire end L and zero line side n input.
In the present embodiment, described constant flow module 200 comprises the first resistance R1, the second resistance R2, the 3rd resistance R3, the first triode Q1 and the second triode Q2; The base stage of described first triode Q1 connects one end of the second resistance R2 and the collector electrode of the second triode Q2, the collector electrode of the first triode Q1 connects the 2nd pin of one end of the first resistance R1, the other end of the second resistance R2 and rectification module 100, the emitter of the first triode Q1 connects the base stage of the other end of the first resistance R1, one end of the 3rd resistance R3 and the second triode Q2, and the other end of described 3rd resistance R3 connects the emitter of the second triode Q2 and the positive pole of first paragraph LED string L1.
Wherein, the first triode Q1 and the second triode Q2 is small-power NPN triode.The size of the continuous current preset is determined by the resistance of the 3rd resistance R3.When line voltage half cycle peak point voltage becomes large, the crest voltage of supply voltage also becomes large, the base current that second resistance R2 is supplied to the first triode Q1 increases, the collector current of the first triode Q1 increases, the electric current flowing through the 3rd resistance R3 increases, the base emitter voltage of the second triode Q2 also increases, and the ducting capacity of the second triode Q2 is strengthened, thus the collector current of the second triode Q2 is increased.The base current that second resistance R2 is supplied to the first triode Q1 plays shunting action, the ducting capacity of the first triode Q1 is weakened, the collector current of the first triode Q1 reduces, thus restrained effectively the increase of output current I, output current I is limited within the scope of the continuous current preset of LED, output current I total amount is made to maintain balance, keep civil power crest place Constant current output, the variation solved because of electrical network crest voltage causes LED to produce super-high-current near peak value and seriously reduces the problem in LED life-span.
In the present embodiment, described first driver element 3011 comprises the 3rd triode Q3, the 4th triode Q4, the 4th resistance R4, the 5th resistance R5 and the 6th resistance R6, the base stage of described 3rd triode Q3 connects one end of the 5th resistance R5 and one end of the 6th resistance R6, the collector electrode of the 3rd triode Q3 connects one end of the 4th resistance R4 and the base stage of the 4th triode Q4, the emitter of the 3rd triode Q3 connects the other end of the 6th resistance R6, the emitter of the 4th triode Q4 and ground, the other end of described 4th resistance R4 connects the other end of the 5th resistance R5, the other end of the second resistance R2 and the 2nd pin of rectification module 100, the collector electrode of the 4th triode Q4 connects the negative pole of first paragraph LED string L1 and the positive pole of second segment LED string L2.
Described second driver element 3012 comprises the 5th triode Q5, the 6th triode Q6, the 7th resistance R7, the 8th resistance R8 and the 9th resistance R9; The base stage of described 5th triode Q5 connects one end of the 8th resistance R8 and one end of the 9th resistance R9, the collector electrode of the 5th triode Q5 connects one end of the 7th resistance R7 and the base stage of the 6th triode Q6, the other end of the 7th resistance R7 connects the 2nd pin of the other end of the 8th resistance R8, the other end of the 4th resistance R4 and rectification module 100, and the collector electrode of the 6th triode Q6 connects the negative pole of second segment LED string L2 and the positive pole of the 3rd section of LED string L3; The equal ground connection of negative pole of the emitter of the 5th triode Q5, the emitter of the 6th triode Q6 and the 3rd section of LED string L3.
Wherein, described 3rd triode Q3, the 4th triode Q4, the 5th triode Q5 and the 6th triode Q6 are small-power NPN triode.When supply voltage starts to rise in zero passage voltage, the base current that 4th resistance R4 is supplied to the 4th triode Q4 makes the 4th triode Q4 conducting ground connection, meanwhile, the base current that the 7th resistance R7 is supplied to the 6th triode Q6 makes the 6th triode Q6 conducting ground connection, and first paragraph LED string L1 lights.
5th resistance R5, the 6th resistance R6 dividing potential drop provide base voltage to the 3rd triode Q3, and when this base voltage increase reaches certain value, the 3rd triode Q3 conducting, makes the 4th triode Q4 end, and first paragraph LED string L1, second segment LED string L2 light.
8th resistance R8, the 9th resistance R9 dividing potential drop provide base voltage to the 5th triode Q5, when this base voltage increase reaches certain value, 5th triode Q5 conducting, 6th triode Q6 is ended, now all LED are entirely bright, and namely first paragraph LED string L1, second segment LED string L2 and a 3rd section LED string L3 lights.
After line voltage reaches peak value, when its magnitude of voltage drops to first threshold, LED knocks out piecemeal from the 3rd section of LED string L3, namely along with the decline of magnitude of voltage, the dividing potential drop of the 8th resistance R8, the 9th resistance R9 diminishes gradually and the 5th triode Q5 is ended, 6th triode Q6 conducting, thus the 3rd section of LED string L3 is knocked out.When magnitude of voltage continues to decline, the dividing potential drop of the 5th resistance R5 and the 6th resistance R6 diminishes gradually and the 3rd triode Q3 is ended, the 4th triode Q4 conducting, thus second segment LED string L2 is also knocked out.Even if line voltage continues to decline, its magnitude of voltage also can make the 4th triode Q4 keep conducting state, guarantees that first paragraph LED string L1 keeps illuminating state.Therefore, when line voltage reduces, always have part LED to light, thus effectively raise the power factor of driving power, the high efficiency achieving the energy utilizes.
In sum, the LED multi-stage constant current that the utility model provides drives lighting device, because the utility model LED drive power is provided with constant-current control circuit and drive part by part control circuit.Output current is made not become large with it by constant-current control circuit when voltage is large near line voltage half cycle peak value, and still have part LED to light when line voltage is lower, the power factor of driving power can reach more than 93%, eliminate electric source filter circuit and filter capacitor simultaneously, substantially increase the reliability of driving power, therefore it is compared with existing LED drive power, there is output current little by mains ac power supply voltage variations affect, output current is limited in the feature within the scope of continuous current that LED presets, the life-span of effective raising LED, and driving power to have reliability high, the feature of High Power Factor, achieve the efficiency utilization of the energy, reduce the expense of maintenance and repair in the future, its power factor is high, and number of elements is few, and cost is low, safe and power saving, meets the title of LED " green illumination ", is suitable for direct city electrically driven (operated) serial connection LED illumination electricity-saving lamp, the especially LED daylight lamp of 10W ~ 20W.
Be understandable that; for those of ordinary skills; can be equal to according to the technical solution of the utility model and utility model design thereof and replace or change, and all these change or replace the protection range that all should belong to the claim appended by the utility model.
Claims (7)
1. LED multi-stage constant current drives a lighting device, and be connected with LED group, described LED group comprises three sections of LED strings of series connection, it is characterized in that, described LED multi-stage constant current drives lighting device to comprise:
For carrying out to civil power the rectification module that rectification becomes Voltage pulsating direct-current supply;
For output current being limited in when mains fluctuations the constant flow module within the scope of default continuous current;
Light for carrying out segmentation according to the size of supply voltage to LED group or extinguish, and controlling the drive part by part module that at least one section of LED string light when supply voltage reduces;
Described constant flow module connects rectification module and LED group, described drive part by part model calling rectification module, constant flow module and LED group.
2. LED multi-stage constant current according to claim 1 drives lighting device, and it is characterized in that, described LED group comprises first paragraph LED string, second segment LED string and the 3rd section of LED string; Described drive part by part module comprises the first driver element and the second driver element;
The input of described first driver element connects rectification module and constant flow module, the output of the first driver element connects the negative pole of first paragraph LED string and the positive pole of second segment LED string, the input of the second driver element connects the input of rectification module, constant flow module and the first driver element, the output of the second driver element connects the negative pole of second segment LED string and the positive pole of the 3rd section of LED string, the minus earth of the 3rd section of LED string.
3. LED multi-stage constant current according to claim 2 drives lighting device, and it is characterized in that, described constant flow module comprises the first resistance, the second resistance, the 3rd resistance, the first triode and the second triode; The base stage of described first triode connects one end of the second resistance and the collector electrode of the second triode, the collector electrode of the first triode connects the 2nd pin of one end of the first resistance, the other end of the second resistance and rectification module, the emitter of the first triode connects the other end of the first resistance, one end of the 3rd resistance and the base stage of the second triode, and the other end of described 3rd resistance connects the emitter of the second triode and the positive pole of first paragraph LED string.
4. LED multi-stage constant current according to claim 3 drives lighting device, and it is characterized in that, described first driver element comprises the 3rd triode, the 4th triode, the 4th resistance, the 5th resistance and the 6th resistance; The base stage of described 3rd triode connects one end of the 5th resistance and one end of the 6th resistance, the collector electrode of the 3rd triode connects one end of the 4th resistance and the base stage of the 4th triode, the emitter of the 3rd triode connects the other end of the 6th resistance, the emitter of the 4th triode and ground, the other end of described 4th resistance connects the 2nd pin of the other end of the 5th resistance, the other end of the second resistance and rectification module, and the collector electrode of the 4th triode connects the negative pole of first paragraph LED string and the positive pole of second segment LED string.
5. LED multi-stage constant current according to claim 4 drives lighting device, and it is characterized in that, described second driver element comprises the 5th triode, the 6th triode, the 7th resistance, the 8th resistance and the 9th resistance; The base stage of described 5th triode connects one end of the 8th resistance and one end of the 9th resistance, the collector electrode of the 5th triode connects one end of the 7th resistance and the base stage of the 6th triode, the other end of the 7th resistance connects the 2nd pin of the other end of the 8th resistance, the other end of the 4th resistance and rectification module, and the collector electrode of the 6th triode connects the negative pole of second segment LED string and the positive pole of the 3rd section of LED string; The equal ground connection of negative pole of the emitter of the 5th triode, the emitter of the 6th triode and the 3rd section of LED string.
6. LED multi-stage constant current according to claim 3 drives lighting device, and it is characterized in that, described first triode and the second triode are NPN triode.
7. LED multi-stage constant current according to claim 5 drives lighting device, and it is characterized in that, described 3rd triode, the 4th triode, the 5th triode and the 6th triode are NPN triode.
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| CN201520441789.4U CN204795736U (en) | 2015-06-25 | 2015-06-25 | LED segmentation constant current drive lighting device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105764178A (en) * | 2015-12-16 | 2016-07-13 | 上海大学 | Stroboflash-free sectional type constant-current LED driving circuit |
| CN110072317A (en) * | 2019-04-29 | 2019-07-30 | 浙江工业大学 | Containing the segmented LED drive circuit and its optimization method for damaging input current waveform compensating unit |
-
2015
- 2015-06-25 CN CN201520441789.4U patent/CN204795736U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105764178A (en) * | 2015-12-16 | 2016-07-13 | 上海大学 | Stroboflash-free sectional type constant-current LED driving circuit |
| CN110072317A (en) * | 2019-04-29 | 2019-07-30 | 浙江工业大学 | Containing the segmented LED drive circuit and its optimization method for damaging input current waveform compensating unit |
| CN110072317B (en) * | 2019-04-29 | 2024-04-09 | 浙江工业大学 | Segmented LED driving circuit with loss input current waveform compensation unit and optimization method thereof |
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