CN101932154A - Alternate current light emitting diode circuit for improving power factor - Google Patents
Alternate current light emitting diode circuit for improving power factor Download PDFInfo
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- CN101932154A CN101932154A CN2009101082775A CN200910108277A CN101932154A CN 101932154 A CN101932154 A CN 101932154A CN 2009101082775 A CN2009101082775 A CN 2009101082775A CN 200910108277 A CN200910108277 A CN 200910108277A CN 101932154 A CN101932154 A CN 101932154A
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- alternating current
- emitting diode
- led circuit
- light emitting
- light
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Abstract
The invention discloses an alternate current light emitting diode circuit for improving a power factor. The circuit is provided with a plurality of driving components and a light emitting diode strip consisting of multiple strings of light emitting diodes, and can be further coupled to a bridge rectifying unit. The driving components are used for stabilizing voltage or input current; by combining the conduction modes of each string of light emitting diodes of the circuit at different voltage points, the input current can be changed along with the change of the input voltage; and thus the waveform of the input current is similar to that of the input voltage so as to improve the power factor.
Description
[technical field]
The present invention system refers to especially that about a kind of alternating current of led circuit a kind of utilization plural number string in parallel light emitting diode string reaches input current waveform near sinusoidal ripple and uses the alternating current of led circuit that improves power factor.
[prior art]
In the energy starved epoch, using the article of high efficiency low power consuming has been the trend of present industry, therefore led technology becomes the illuminations of a new generation because have advantages such as energy conversion efficiency height, fast, high flicker frequency of reaction time, long service life and power saving.
The AC power light-emitting diode is except being compatible with traditional lighting, also significantly reduce simultaneously the heat dissipation problem of traditional type light-emitting diode, and change the traditional design and the occupation mode of High Power LED encapsulation fully, 15～30% power loss when the about light-emitting diode of can saving over of estimation is changed between direct current, alternating current, not only carbon reduction has also promoted the luminous efficiency of whole light-emitting diode.
Must drive with the direct current constant current source because belong to the light-emitting diode of semiconductor light sources, in order to cooperate the use of general interchange transmission ﹠ distribution power supply, therefore:
First kind of practice is to connect a transducer between DC power supply and AC power, and for example high pressure DriverIC or transformer add Driver IC.Second kind of practice sees also A figure and B figure, utilize each light emitting diode string of two strings by tens of light-emitting diode serial connections, with its reverse butt joint, a nearly step can be aided with ball bearing made using (for example resistance) again, in order to absorb the part that surpasses the total conducting voltage of light-emitting diode.The third known practice is to utilize a bridge rectifier to be coupled to light emitting diode string, is aided with ball bearing made using (for example resistance) again, in order to absorb the part that surpasses the total conducting voltage of light-emitting diode.The 4th kind of known practice is to utilize light-emitting diode to form a bridge rectifier, and couples a resistance before bridge rectifier, the total conducting voltage that surpasses in order to absorption.
But the transducer volume is big, Heavy Weight, and not only increasing cost, power conversions also has consume, can't with the price competition of existing light source, therefore restriction to some extent on range of application and popularization degree all the time.And second kind of practice need increase assembly and make cost improve, and the power factor of above-mentioned several practices (Power factor, PF) can only reach about 0.8 to 0.9, at present for the requirement of the power factor of illuminations usually all more than 0.9, though the therefore known light-emitting diode that can be applied to AC power that provides, its illumination effect still haves much room for improvement.
Therefore, main purpose of the present invention is to provide a kind of alternating current of led circuit that can improve power factor, to improve the problems referred to above.
[summary of the invention]
Take a broad view of the above, utilize the light-emitting diode of AC power not reach the power factor of demand in known, therefore develop limitedly, the present invention's purpose is providing a kind of alternating current of led circuit of the bring to power factor.
The present invention system is about a kind of alternating current of led circuit of the bring to power factor, and this circuit system sees through a bridge rectifier unit and is coupled on the AC power, and the output of AC power has one first output connecting pin and one second output connecting pin.This alternating current of led circuit comprises a plurality of driven units and a plurality of light emitting diode string.
The bridge rectifier unit is to be coupled by a plurality of diodes to combine, its purpose system is in order to the rectification alternating current, the input of bridge rectifier unit is respectively coupled to first output connecting pin and second output connecting pin, and these diode places of coupling are respectively a first node and a Section Point.Driven unit is for example decided electric current diode, resistance, electric capacity, inductance etc., is coupled to first node or Section Point.Light emitting diode string system is coupled by a plurality of light-emitting diodes and forms, light-emitting diode number in the light emitting diode string can equate or be unequal, and be parallel to the bridge rectifier unit, the Shu end polyphone of each light emitting diode string connects at least one driven unit, one of them driven unit is connected with light-emitting diode, other couples a driven unit in light emitting diode string between wantonly two light-emitting diodes, and the other end of light emitting diode string is coupled to Section Point.
Therefore, the alternating current of led circuit of the present invention's the bring to power factor, bridge rectifier wherein can be so that light-emitting diode be applied to AC power, can make stabilized input voltage and couple driven unit, reduce the influence of voltage to light emitting diode string, cause the corresponding different input current of different input voltages, make the waveform of input current be similar to sine wave, reach the purpose that improves power factor.
Advantage about the present invention can be by following detailed Description Of The Invention and appended graphic being further understood with spirit.
[execution mode]
Because the alternating current of led circuit of the bring to power factor provided by the present invention, can be widely used in various lighting installations, its combination execution mode is too numerous to enumerate especially, so give unnecessary details no longer one by one at this, only enumerates wherein preferable embodiment and is specified.The alternating current of led circuit of the present invention's the bring to power factor is to be applicable to that AC power is to produce the effect of illumination.
See also second figure, second figure is the alternating current of led circuit 1 first embodiment schematic diagram of the present invention's the bring to power factor.As shown in the figure, system comprises a plurality of driven units 12 and a plurality of light emitting diode string 13 in the alternating current of led circuit 1 of the bring to power factor.Alternating current of led circuit 1 is to couple through a bridge rectifier unit 11 and an AC power 9.The output of AC power 9 has one first output connecting pin 91 and one second output connecting pin 92, and load system couples with first output connecting pin 91 and second output connecting pin 92; Driven unit 12 means resistance, electric capacity, inductance, decides the combination of electric current diode, IC or said modules.
Comprise four diodes in the bridge rectifier unit 11, it is respectively first diode 111, second diode 112, the 3rd diode 113 and the 4th diode 114.The positive pole of first diode 111 and first output connecting pin 91 couple, the negative pole of the negative pole of first diode 111 and second diode 112 couples, after the negative pole of the positive pole of second diode 112 and the 3rd diode 113 couples, be coupled to second output connecting pin 92 again, the positive pole of the positive pole of the 3rd diode 113 and the 4th diode 114 couples, and the negative pole of the 3rd diode 113 and first output connecting pin 91 couple.
Wherein, the negative pole place of coupling of the negative pole of first diode 111 and second diode 112 is that the positive pole of first node 118, the three diodes 113 and the positive pole place of coupling of the 4th diode 114 are Section Point 119.
When AC power 9 produces the electric current of positive half period, first diode 111 and the 4th all conductings of diode 114 (ON), and second diode 112 and the 113 neither conductings (OFF) of the 3rd diode, therefore electric current to the first output connecting pin 91 exports load by first diode, 111 backs to from first node 118, again by Section Point 119 the 4th diode 114 to second output connecting pins 92 of flowing through.
When AC power 9 produces the electric current of negative half-cycle, second diode 112 and the 3rd all conductings of diode 113 (ON), and first diode 111 and the 114 neither conductings (OFF) of the 4th diode, electric current exports load to after second output connecting pin 92 is through second diode 112, first node 118, flow to first output connecting pin 91 via Section Point 119, the 3rd diode 113 again.Above-mentioned load is passive unit 12 and light emitting diode string 13.
Shown in second figure, couple with first node 118 again after second contact 122 of an end of light emitting diode string 13 system and driven unit 12 couples, and the other end of light emitting diode string 13 system couples with Section Point 119; First contact 121 ' of another driven unit 12a also couples with first node 118, and second contact 122 ' of driven unit 12a then is coupled in the light emitting diode string 13 between wantonly two light-emitting diodes.In addition, first contact 121 and 121 ' of driven unit 12,12a more can be coupled to Section Point 119, and second contact 122 of driven unit 12a then similarly is coupled in the light emitting diode string 13 between wantonly two light-emitting diodes.Alternating current of led circuit 1 is bridge rectifier unit 11 a plurality of light emitting diode string 13 in parallel, 13a, 13b, 13c, 13d ..., and each light emitting diode string 13 first driven unit 12 of series connection and couple another driven unit 12a all respectively.Light emitting diode string 13 is to be become by a plurality of light emitting diode string joint groups, light-emitting diode number in wantonly two light emitting diode string 13 can equate or be unequal, be that light-emitting diode number among the light emitting diode string 13a can be equal to the light-emitting diode number among the light emitting diode string 13b, in addition, the light-emitting diode number among the light emitting diode string 13a can unequal light-emitting diode number in light emitting diode string 13b.
See also the 2nd A figure, it is the present invention's the second embodiment schematic diagram, as shown in the figure, light emitting diode string 13 can also couple a plurality of driven units 12,12a simultaneously, first contact 121,121 ' of driven unit 12 and 12a all is coupled to first node 118, perhaps, first contact 121,121 ' can also be coupled to Section Point 119, and second contact 122 ' of driven unit 12a then is coupled in the light emitting diode string 13 between wantonly two light-emitting diodes.
See also the 2nd B figure, it is the present invention's the 3rd an embodiment schematic diagram, and as shown in the figure, the present invention more can couple at least one electric capacity c.Electric capacity c can couple with second contact 122 of driven unit 12, can also couple with second contact 122 ' of driven unit 12a, that is electric capacity c system couples in driven unit 12, light emitting diode string 13 or the light emitting diode string 13 between wantonly two light-emitting diodes.Scheming visible electric capacity by the 2nd B is to be arranged at diverse location, only lifts preferred embodiment as an illustration in this, is limited to for claim.
Therefore when AC power 9 output ACs electricity, see through 11 rectifications of bridge rectifier unit earlier, absorb the conducting voltage that surpasses through driven unit 12 again.We utilize the notion of analog-to-digital, the crosscut of string ripple is divided into many strip blocks, because coupling driven unit 12, utilization makes that the operating current of each light emitting diode string is identical, therefore each light emitting diode string 13 is corresponding strip block, so when different voltages produced, each light emitting diode string 13 was a corresponding different voltage and luminous.
In addition, because a number number system of light emitting diode string 13 can set up on their own, and the drive current of light-emitting diode of respectively going here and there is identical, therefore, we only need to select respectively to go here and there suitable light-emitting diode number, are combined into the light emitting diode string that can make full use of sinusoidal wave each point driven, and respectively go here and there the superposition of the identical drive current of light-emitting diode, then alternating current that can't the driven for emitting lights diode can be saved to minimum, to reach the purpose that improves power factor.
See also the 3rd figure, it is alternating current of led circuit 1 the 4th embodiment schematic diagram of the present invention's the bring to power factor.
Shown in the 3rd figure, can also organize driven unit 12 and light emitting diode string 13 at each, bridge rectifier unit 12 in parallel, and except connecting driven unit 12, also couple driven unit 12a, its connection is as described in first embodiment.Be made into the advantage that increases bridge rectifier unit 11 with the light-emitting diodes tube body and be before each light emitting diode string 13, if unique bridge rectifier 11 produces fault, still rectification and luminous individually can not influence integrated circuit.Moreover, also, can save production cost because of long brilliant processing procedure is identical, reduce fraction defective.
See also the 4th figure, it is alternating current of led circuit 1 the 5th embodiment schematic diagram of the present invention's the bring to power factor.
Shown in the 4th figure, we replace bridge rectifier unit 11 with light emitting diode string 13, wherein light emitting diode string is one group in twos, light emitting diode string 13a and light emitting diode string 13a ' are one group, light-emitting diode number in each light emitting diode string 13 can equate or be unequal, yet every group two strings are first output connecting pin 91 and one second output connecting pin 92 that both positive and negative polarity is coupled to AC power 9 on the contrary.When the electric current of positive half period produces, light emitting diode string 13a ' and the neither conducting of light emitting diode string 13b ', electric current is selected the path of light emitting diode string 13a and light emitting diode string 13b; When the electric current of negative half-cycle produces, light emitting diode string 13a ' and all conductings of light emitting diode string 13b ', light emitting diode string 13a and then not conducting of light emitting diode string 13b.Can be applied on the AC power equally.
See also the 5th figure, it is that schematic diagram is cut in the alternating current of led circuit string wavelength-division of the present invention's the bring to power factor.As shown in the figure, be the string ripple S of a positive half period, we are divided into many strip block b with string ripple S, when voltage is minimum, the first strip block b1 is driven, and the first strip block b1 is the light emitting diode string 13a that has n light-emitting diode among corresponding second figure, the second strip block b2 is the light emitting diode string 13b that has n+a light-emitting diode among corresponding second figure, the 3rd strip block b3 is the light emitting diode string 13c that has n+b light-emitting diode among corresponding second figure, the 4th strip block b4 is the light emitting diode string 13d that has n+c light-emitting diode among corresponding second figure, the rest may be inferred, rising along with voltage, many strings light emitting diode string is driven more, therefore, utilizes the real electric current institute superposition that uses of the present invention to go out the figure of the 6th figure, compare the 5th figure and the 6th figure, can find obviously that superposition figure and original waveform figure are similar, expression the present invention has promoted power factor effectively.
Therefore, the alternating current of led circuit by the present invention's the bring to power factor can be applied on the AC power.As long as we select respectively to go here and there suitable light-emitting diode number, be combined into the light emitting diode string that can make full use of sinusoidal wave each point driven, respectively go here and there the identical drive current superposition of light-emitting diode with it, just can properly utilize alternating current, power factor of the present invention can reach more than 0.97.
In addition, the present invention can with combine a three-pole AC switch, claim amphicheirality's three utmost point thyristors (TRI-ELECTRODE AC SWITCH again, TRIAC), adjust input voltage phase angle size, can determine to make which light emitting diode string conducting by adjusting input current value, when the big electric current of input, the light emitting diode string that is switched on increases, so light fixture brightens, on the contrary, the light emitting diode string that is switched on when importing less electric current reduces, and lamp brightness reduces, thereby reaches the effect of adjusting light and shade, and known light-emitting diode and no this item function are used as one of the illumination quantum jump for light-emitting diode in fact.
By the detailed description of above preferred embodiment, hope can be known the feature and spirit of describing the present invention more, and is not to come the present invention's category is limited with above-mentioned disclosed preferred embodiment.On the contrary, its objective is that hope can contain in the category of claim of being arranged in of various changes and tool equality institute of the present invention desire application.
[brief description of drawingsfig]
Figure 1A is known alternating current of led circuit;
Figure 1B is known alternating current of led circuit;
Fig. 2 is the alternating current of led circuit first embodiment schematic diagram of the present invention's the bring to power factor;
Fig. 2 A is the alternating current of led circuit second embodiment schematic diagram of the present invention's the bring to power factor;
Fig. 2 B is alternating current of led circuit the 3rd embodiment schematic diagram of the present invention's the bring to power factor;
Fig. 3 is alternating current of led circuit the 4th embodiment schematic diagram of the present invention's the bring to power factor;
Fig. 4 is alternating current of led circuit the 5th embodiment schematic diagram of the present invention's the bring to power factor;
Fig. 5 cuts schematic diagram for the alternating current of led circuit string wavelength-division of the present invention's the bring to power factor; And
Fig. 6 is for utilizing the electric current superposition figure that the present invention can utilization.
[primary clustering symbol description]
Resistance R 1, R2 capacitor C
Alternating current of led circuit 1 bridge rectifier unit 11
Second contact 122,122 '
Light emitting diode string 13,13a, 13b, 13c, 13d, 13a ', 13b '
First diode, 111 second diodes 112
The 3rd diode 113 the 4th diode 114
AC power 9 first output connecting pins 91
Second output connecting pin, 92 first nodes 118
The strip block b first strip block b1
The second strip block b2 the 3rd strip block b3
The 4th strip block b4.
Claims (16)
1. the alternating current of led circuit of a bring to power factor is to be coupled on the AC power, and one of this AC power output cording has one first output connecting pin and one second output connecting pin; It is characterized in that this alternating current of led circuit comprises:
A plurality of light emitting diode string are to be coupled by a plurality of light-emitting diodes to form, and one end system couples with this first output connecting pin, and its other end system couples with this second output connecting pin; And
A plurality of driven units, it respectively has one first contact and one second contact, this first contact system is coupled to the two Shu person of this first output connecting pin or this second output connecting pin, and this second contact system is coupled in this light emitting diode string between wantonly two light-emitting diodes.
2. alternating current of led circuit as claimed in claim 1, it is characterized in that this alternating current of led circuit more comprises a bridge rectifier unit, the input of this bridge rectifier unit is respectively coupled to this first output connecting pin and this second output connecting pin, the output of this bridge rectifier unit is respectively a first node and a Section Point, this first node system is coupled to this first contact, and this Section Point system is coupled to one of this light emitting diode string end.
3. alternating current of led circuit as claimed in claim 1 is characterized in that the number system of these light-emitting diodes of these light emitting diode string equates.
4. alternating current of led circuit as claimed in claim 1 is characterized in that the number of these light-emitting diodes of these light emitting diode string is unequal.
5. alternating current of led circuit as claimed in claim 2 is characterized in that this bridge rectifier unary system is made up of a plurality of light-emitting diodes.
6. alternating current of led circuit as claimed in claim 2, this bridge rectifier unary system of its feature is made up of a plurality of diodes.
7. alternating current of led circuit as claimed in claim 1 is characterized in that this second contact system couples an electric capacity.
8. alternating current of led circuit as claimed in claim 1 is characterized in that a plurality of light-emitting diodes piping series connection in this light emitting diode string.
9. alternating current of led circuit as claimed in claim 1 is characterized in that these light emitting diode string systems couple with parallel way.
10. alternating current of led circuit as claimed in claim 1 is characterized in that these driven units are resistance.
11. alternating current of led circuit as claimed in claim 1 is characterized in that these driven units are electric capacity.
12. alternating current of led circuit as claimed in claim 1 is characterized in that these driven units are to decide electric current diode (Current Regulating Diode).
13. alternating current of led circuit as claimed in claim 1 is characterized in that these driven units are inductance.
14. alternating current of led circuit as claimed in claim 1 is characterized in that these driven units are to decide current drives IC.
15. alternating current of led circuit as claimed in claim 1, it is characterized in that this first output connecting pin system couple a three-pole AC switch (amphicheirality's three utmost point thyristors) (TRI-ELECTRODE AC SWITCH, TRIAC).
16. alternating current of led circuit as claimed in claim 1, it is characterized in that this second output connecting pin system couple a three-pole AC switch (amphicheirality's three utmost point thyristors) (TRI-ELECTRODE AC SWITCH, TRIAC).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101082775A CN101932154A (en) | 2009-06-24 | 2009-06-24 | Alternate current light emitting diode circuit for improving power factor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101082775A CN101932154A (en) | 2009-06-24 | 2009-06-24 | Alternate current light emitting diode circuit for improving power factor |
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| Publication Number | Publication Date |
|---|---|
| CN101932154A true CN101932154A (en) | 2010-12-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101082775A Pending CN101932154A (en) | 2009-06-24 | 2009-06-24 | Alternate current light emitting diode circuit for improving power factor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103256512A (en) * | 2013-04-03 | 2013-08-21 | 深圳市光之谷新材料科技有限公司 | Light emitting diode lamp |
| CN104009621A (en) * | 2013-02-24 | 2014-08-27 | 理察·蓝德立·葛瑞 | Device for improving power efficiency for power factor corrections |
-
2009
- 2009-06-24 CN CN2009101082775A patent/CN101932154A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104009621A (en) * | 2013-02-24 | 2014-08-27 | 理察·蓝德立·葛瑞 | Device for improving power efficiency for power factor corrections |
| CN103256512A (en) * | 2013-04-03 | 2013-08-21 | 深圳市光之谷新材料科技有限公司 | Light emitting diode lamp |
| CN103256512B (en) * | 2013-04-03 | 2015-09-23 | 深圳市光之谷新材料科技有限公司 | A kind of LED lamp |
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Application publication date: 20101229 |