CN102170731A - LED drive circuit - Google Patents
LED drive circuit Download PDFInfo
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- CN102170731A CN102170731A CN2011100932695A CN201110093269A CN102170731A CN 102170731 A CN102170731 A CN 102170731A CN 2011100932695 A CN2011100932695 A CN 2011100932695A CN 201110093269 A CN201110093269 A CN 201110093269A CN 102170731 A CN102170731 A CN 102170731A
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- generation unit
- voltage generation
- series connection
- driving voltage
- light
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Abstract
The invention mainly aims to provide an LED (light emitting diode) drive circuit capable of reducing cost. To realize this objective, a driving voltage generation unit adopted by the invention can simultaneously output both positive voltage and negative voltage. With such voltages having opposite polarities to drive multiple series-wound LEDs, the magnitude of voltage of the LED to circuit reference zero point can be reduced, and meanwhile, the equality of working current of the LED can be ensured. The circuit comprises a driving voltage generation unit and multiple LEDs. The cathode of the series-wound LEDs is connected with a negative output terminal of the driving voltage generation unit while the anode of the series-wound LEDs is connected with a positive output terminal of the driving voltage generation unit.
Description
Technical field
The present invention relates to LED driving circuit and mode.
Background technology
Light-emitting diode (Light Emitting Diode, LED).
In a lot of the application, need to use many LEDs simultaneously luminous, for reaching the identical purpose of LED characteristic, require each LED operating current to equate, LED is used in the prior art series connection, reach the purpose that electric current equates, use unidirectional positive voltage mode driven for emitting lights diode, this mode simple in structure, but, in order to limit LED the absolute value of voltage of circuit reference zero is no more than set point, just needs to use a plurality of driving positive voltage generation units, promptly have the high shortcoming of cost.With reference to figure 1.
Summary of the invention
Main purpose of the present invention is to provide the LED driving circuit that reduces cost.
For reaching above-mentioned purpose, the present invention proposes, the driving voltage generation unit is exported positive voltage and negative voltage simultaneously, drive many light-emitting diodes of series connection with this opposite polarity voltage, can reach and reduce the purpose of LED the magnitude of voltage of circuit reference zero, the operating current that guarantees light-emitting diode simultaneously equates, the present invention includes: driving voltage generation unit and many light-emitting diodes, its connected mode is the negative output terminal that the negative electrode of many light-emitting diodes after series connection connects the driving voltage generation unit, and the anode of these many light-emitting diodes after series connection connects the positive output end of driving voltage generation unit.Above-mentioned driving voltage generation unit can be produced by multiple circuit, transformer for example, DC-DC converter etc.
Description of drawings
Fig. 1 is the block diagram of traditional light-emitting diode and drive circuit thereof.
Fig. 2 is the block diagram of the LED driving circuit of the embodiment of the invention.
Description of symbols among the figure:
V1: the output of the voltage generation unit 1 of prior art
Vn: the output of the voltage generation unit n of prior art
N: the number of the voltage generation unit of prior art
A: positive voltage output end
B: negative voltage output.
Embodiment
Some exemplary embodiments that embody feature of the present invention and advantage will be described in detail in the explanation of back segment.Be understood that the present invention can have various variations in different application, it does not all depart from the scope of the present invention, and explanation wherein and the accompanying drawing usefulness that ought explain in itself, but not in order to restriction the present invention.
The present invention is a LED driving circuit, the driving voltage generation unit is exported positive voltage and negative voltage simultaneously, light-emitting diode to many series connection provides opposite polarity operating voltage, Fig. 2 is the block diagram of the LED driving circuit of the embodiment of the invention, Fig. 2 comprises: driving voltage generation unit, the light-emitting diode of many series connection.
Above-mentioned driving voltage generation unit can be produced by multiple circuit, and for example transformer can the output AC electricity, behind rectifying and wave-filtering, can export positive voltage and negative voltage simultaneously, DC-DC converter etc.
Many above-mentioned light-emitting diodes, its connected mode are that the negative electrode after these many light-emitting diode series connection connects the negative output terminal of driving voltage generation unit, the positive output end of the anode connection driving voltage generation unit after these many light-emitting diode series connection; Be called one group after many light-emitting diode series connection, each is organized light-emitting diode and can connect again, and the negative electrode after the series connection connects the negative output terminal of driving voltage generation unit again, and the anode after the series connection connects the positive output end of driving voltage generation unit again; When the light-emitting diode characteristic close, can in parallelly use, be called a row, each row's series connection then, the negative electrode after each row's series connection connects the negative output terminal of driving voltage generation unit, and the anode after each row's series connection connects the positive output end of driving voltage generation unit.
Following each voltage of saying, all for the reference zero of driving voltage generation unit, this reference zero connects usually uses system reference of the present invention zero point.
For ease of understanding, among Fig. 1, establish n=2, the operating voltage of the light-emitting diode 1 of many series connection is the V1 volt, the operating voltage of the light-emitting diode 2 of many series connection is the V2 volt.Suppose in order to reduce cost, be reduced to and use a driving voltage generation unit, drive the light-emitting diode 1 of many series connection of series connection again and the light-emitting diode 2 of many series connection simultaneously, then to need output voltage be the V3 volt to this voltage generation unit, for the characteristics of luminescence that makes light-emitting diode identical, V3=V1+V2 then, to this voltage generation unit, too high output voltage V 3 increases the design cost of voltage generation unit, device cost; For the system that uses this light-emitting diode, too high voltage V3 will make the cost of system design increase, and for example insulation costs increases.
For addressing the aforementioned drawbacks, the present invention proposes an embodiment, and among Fig. 2, a is a positive output end, and establishing this output end voltage is the Va volt; B is a negative output terminal, establishes this negative output terminal voltage to be-the Vb volt.For the light-emitting diode 1 of many series connection driving again series connection and the light-emitting diode 2 of many series connection, then have Va-(Vb)=V3, i.e. Va+Vb=V3.As can be seen: Va＜V3, Vb＜V3 so the opposite type of drive of polarity of voltage that adopts the present invention to propose can reduce the output voltage of driving voltage generation unit, reduces design cost thus.
In sum, LED driving circuit of the present invention and mode utilization are different from traditional LED driving circuit and mode, make that the operating voltage polarity at many LED two ends is opposite, effectively reduced the magnitude of voltage of the light-emitting diode two ends of more series connection to the circuit reference zero, therefore more LED can connect, can reduce the quantity and the cost of driving voltage generation unit thus significantly, when needs drive more light-emitting diode, only need to use a plurality of circuit shown in Figure 2, reach the purpose that drives more light-emitting diode.
What should be understood that is: the foregoing description is the explanation to the opposite polarity operating voltage of the present invention's proposition; rather than limitation of the present invention; the present invention can carry out various modifications by those skilled in the art; any innovation and creation that do not exceed in the connotation scope of the present invention all do not break away from the protection range of claims.
Claims (3)
1. LED driving circuit, be used for providing opposite polarity operating voltage to many light-emitting diodes, described LED driving circuit, comprise driving voltage generation unit and many light-emitting diodes, it is characterized by, many light-emitting diode series connection, the negative electrode after the series connection connects the negative output terminal of driving voltage generation unit, and the anode after the series connection connects the positive output end of driving voltage generation unit.
2. many light-emitting diodes in the LED driving circuit as claimed in claim 1, it is characterized in that the negative electrode after these many light-emitting diodes are connected connects the negative output terminal of driving voltage generation unit, the anode after these many light-emitting diodes series connection connects the positive output end of driving voltage generation unit; Be called one group after many light-emitting diode series connection, each is organized light-emitting diode and can connect again, and the negative electrode after the series connection connects the negative output terminal of driving voltage generation unit again, and the anode after the series connection connects the positive output end of driving voltage generation unit again; When the light-emitting diode characteristic close, can in parallelly use, be called a row, each row's series connection then, the negative electrode after each row's series connection connects the negative output terminal of driving voltage generation unit, and the anode after each row's series connection connects the positive output end of driving voltage generation unit.
3. the driving voltage generation unit in the LED driving circuit as claimed in claim 1, it is characterized in that, this driving voltage generation unit is exported positive voltage and negative voltage simultaneously, drive many light-emitting diodes of series connection with this opposite polarity voltage, form the opposite working method of polarity of voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100932695A CN102170731A (en) | 2011-02-28 | 2011-04-14 | LED drive circuit |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110046261 | 2011-02-28 | ||
| CN201110046261.3 | 2011-02-28 | ||
| CN2011100932695A CN102170731A (en) | 2011-02-28 | 2011-04-14 | LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102170731A true CN102170731A (en) | 2011-08-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100932695A Pending CN102170731A (en) | 2011-02-28 | 2011-04-14 | LED drive circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN102170731A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102281688A (en) * | 2011-09-20 | 2011-12-14 | 马丽娟 | Drive circuit for light emitting diode |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040046771A1 (en) * | 2002-08-19 | 2004-03-11 | Tai-Shan Liao | Driver for amplifying operating voltage of luminary |
| CN101909378A (en) * | 2009-06-05 | 2010-12-08 | 华映视讯（吴江）有限公司 | LED driving device and method |
-
2011
- 2011-04-14 CN CN2011100932695A patent/CN102170731A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040046771A1 (en) * | 2002-08-19 | 2004-03-11 | Tai-Shan Liao | Driver for amplifying operating voltage of luminary |
| CN101909378A (en) * | 2009-06-05 | 2010-12-08 | 华映视讯（吴江）有限公司 | LED driving device and method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102281688A (en) * | 2011-09-20 | 2011-12-14 | 马丽娟 | Drive circuit for light emitting diode |
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| PB01 | Publication | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110831 |