CN102196635A - Opening method of output tube of LED drive integrated circuit - Google Patents
Opening method of output tube of LED drive integrated circuit Download PDFInfo
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- CN102196635A CN102196635A CN2011100583425A CN201110058342A CN102196635A CN 102196635 A CN102196635 A CN 102196635A CN 2011100583425 A CN2011100583425 A CN 2011100583425A CN 201110058342 A CN201110058342 A CN 201110058342A CN 102196635 A CN102196635 A CN 102196635A
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- efferent duct
- led drive
- drive integrated
- output tube
- electric current
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Abstract
The invention provides an opening method of an output tube of an LED drive integrated circuit, solving the problems of EMI (Electro-Magnetic Interference) and the like. The LED drive integrated circuit comprises an output tube controller, the output tube and a voltage dropper, wherein the voltage dropper is connected in series with the output tube; and currents flowing out of the output tube flow into the voltage dropper. The LED drive integrated circuit is characterized in that the output tube controller particularly comprises an output tube current collecting module, an output tube opening module and an output tube closing module, wherein the output tube current collecting module is used for collecting currents flowing through the output tube; the output tube opening module is used for opening the output tube when the currents collected by the output tube current collecting module are zero; and the output tube closing module is used for closing the output tube when the voltage drop of the voltage dropper reaches a predetermined value.
Description
Technical field
The present invention relates to LED field and field of power supplies, relate in particular to the deployment method of LED drive integrated circult and efferent duct thereof.
Background technology
Switching Power Supply is the main mode of LED drive integrated circult, for extraneous power supply is the situation of AC power, the LED drive integrated circult is commonly used to be had non-isolated buck topological structure and isolates the anti-topological structure that swashs, with the conversion of signals of AC power input that will input be can driving LED power supply signal.
The LED drive integrated circult has multiple structure at present, but great majority include efferent duct controller, efferent duct and resistance, wherein efferent duct and resistance series connection, and the electric current that efferent duct flows out flows into resistance, and further flows out by resistance.Wherein the efferent duct controller is controlled efferent duct according to the fixed frequency of self internal oscillator and is opened, and after opening, when described ohmically pressure drop reaches predetermined value, closes efferent duct at every turn.
But such scheme is normal is to control efferent duct with fixed frequency to open, and therefore has serious problems such as electromagnetic interference (EMI).
Summary of the invention
The invention provides the deployment method of LED drive integrated circult and efferent duct thereof, with problems such as solution EMI.
The invention provides the LED drive integrated circult, comprise efferent duct controller, efferent duct and drop device, described drop device is connected with efferent duct, the electric current that flows out efferent duct flows into drop device, it is characterized in that, described efferent duct controller specifically comprises: efferent duct current acquisition module is used for the electric current that acquisition stream is crossed efferent duct; Efferent duct is opened module, when the electric current that is used for collecting at described acquisition module is zero, starts efferent duct; The efferent duct closing module when being used for pressure drop on described drop device and reaching predetermined value, is closed efferent duct.
The invention provides the efferent duct opening control method of LED drive integrated circult, comprise step: acquisition stream is crossed the electric current of efferent duct; When the electric current that collects is zero, open efferent duct.
The present invention is variable by the time that the such scheme that provides makes efferent duct open, and is to open the EMI problem that efferent duct causes the set time thereby avoided prior art with fixed frequency.
Description of drawings
Fig. 1 is the driving power structural representation of first embodiment of the invention;
Fig. 2 is the driving power structural representation of second embodiment of the invention;
Fig. 3 is the signal waveform schematic diagram of driving power in the embodiment of the invention.
Embodiment
Because the EMI problem of existing scheme mainly causes by fixed frequency control efferent duct, so present embodiment proposes following proposal and changes efferent duct and open the time, thereby avoided problem such as EMI.
The driving power that present embodiment provides comprises: comprise efferent duct controller, efferent duct and drop device, described drop device is connected with efferent duct, the electric current that flows out efferent duct flows into drop device, it is characterized in that, described efferent duct controller, specifically comprise: efferent duct current acquisition module is used for the electric current that acquisition stream is crossed efferent duct; Efferent duct is opened module, when the electric current that is used for collecting at described acquisition module is zero, starts efferent duct; The efferent duct closing module when being used for pressure drop on described drop device and reaching predetermined value, is closed efferent duct.
The efferent duct opening control method of the LED drive integrated circult that another embodiment provides comprises step: acquisition stream is crossed the electric current of efferent duct; When the electric current that collects is zero, open efferent duct.
Can realize that by such scheme efferent duct opens the change of time, thereby avoid problems such as EMI.
Embodiment sets forth such scheme below by particular circuit configurations:
With Fig. 1 is example, frame of broken lines is a LED drive integrated circult device of the present invention, frame of broken lines left side square frame is the input of power supply, input can be global general-use alternating voltage (85V～265V AC), frame of broken lines the right square frame is the output of power supply, at the LED light fixture, the effect of this device is exactly that alternating current input power supplying is converted to the current source that is fit to the driving LED light fixture especially.
In this device of frame of broken lines representative, B1 is a rectifier bridge; C is an input capacitance; L1 is an inductance; D1 is a fly-wheel diode; Q1 is a power switch pipe; R1 is a current sense resistor; C1 is a critical conduction mode buck configuration controller; In this device, D1, L1, Q1 constitute the buck topology structure;
Fig. 3 has represented system works schematic diagram: V
Q1Be efferent duct switch controlled signal, during high level, the Q1 conducting, during low level, Q1 turn-offs; i
PkBe the inductive current maximum; i
L1Be inductive current; i
AvgBe inductive current mean value; V
RefBe reference voltage level; V
R1Be the pressure drop on the current sense resistor; Work as V
Q1During for high level, the Q1 conducting, D1 ends, and the input power supply constitutes discharge path, inductive current i by LED load, L1, Q1, R1
L1Increase, electric current increases slope and is about
Inductive energy storage is when R1 goes up pressure drop V
R1Reach V
RefThe time, C1 makes V by controller
Q1Become low level, thereby turn-off Q1, this stage is the inductive energy storage stage, for different V
C, the slope difference that inductive current increases, V
R1Reach V
RefAsynchronism(-nization), as the T among the figure
ON1And T
ON2Difference; After Q1 turn-offed, LED load, L1, D1 formed discharge loop, and inductive current descends, and the electric current descending slope is about
Electric current drops to 0 required time
T
OFFWith input voltage V
CIrrelevant, this stage is that inductance is released the energy stage, and controller C1 detects inductive current and drops to for 0 the moment, and with V
Q1Become high level constantly at this, thereby reopen Q1, enter the inductive energy storage stage again, and so forth, form the pulse current source of driving LED load.The electric current that flows through the LED load is the electric current that flows through inductance, mean value i
AvgFor
In application, can change the electric current of LED load by the value of setting R1.Whole supply unit be input as alternating voltage, V behind over commutation
CVoltage can fluctuate, and causes inductive current rate of rise difference, thus the ON time T of Q1
ONDifference, operating frequency are unfixing, this fixedly efferent duct turn-off time, regulate the frequency conversion on ﹠ off operation mode of efferent duct ON time, and optimized the EMI performance of whole system.In this device, inductance discharge and recharge the effect of serving as current source, can save big output capacitance, thereby improve the life-span of whole device.
Fig. 2 is the scheme of another embodiment, is efferent duct Q1, the R1 position in system with the difference of such scheme, and basic principle is the same, but controller C1 need detect the pressure drop on the R1.
Present embodiment is used critical conduction mode buck topology Switching Power Supply structure as the required constant-current source power supply of driving LED lighting, has avoided existing scheme need adopt electrochemical capacitor as output capacitance, thereby has reduced the problem of power source life, and power source life is provided.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (9)
1. a LED drive integrated circult comprises efferent duct controller, efferent duct and drop device, and described drop device is connected with efferent duct, and the electric current that flows out efferent duct flows into drop device, it is characterized in that described efferent duct controller specifically comprises:
Efferent duct current acquisition module is used for the electric current that acquisition stream is crossed efferent duct;
Efferent duct is opened module, when the electric current that is used for collecting at described acquisition module is zero, starts efferent duct;
The efferent duct closing module when being used for pressure drop on described drop device and reaching predetermined value, is closed efferent duct.
2. LED drive integrated circult as claimed in claim 1 is characterized in that, described drop device is a resistance.
3. LED drive integrated circult as claimed in claim 1 is characterized in that, described driving power adopts non-isolated buck topological structure or isolates the anti-structure that swashs.
4. LED drive integrated circult as claimed in claim 1 is characterized in that, the signal of described LED drive integrated circult output is a current signal.
5. LED drive integrated circult as claimed in claim 1 is characterized in that, also comprises the detection inductance, and its electric current flows through efferent duct, and described efferent duct current acquisition module comes acquisition stream to cross the electric current of efferent duct by the electric current on the acquisition testing inductance.
6. the efferent duct opening control method of a LED drive integrated circult is characterized in that, comprises step:
Acquisition stream is crossed the electric current of efferent duct;
When the electric current that collects is zero, open efferent duct.
7. method as claimed in claim 6 is characterized in that, also comprises step:
When the pressure drop on the drop device that efferent duct connects reaches predetermined value, close efferent duct.
8. method as claimed in claim 7 is characterized in that, described drop device is a resistance.
9. method as claimed in claim 6 is characterized in that, the signal of described LED drive integrated circult output is a current signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100583425A CN102196635A (en) | 2011-03-11 | 2011-03-11 | Opening method of output tube of LED drive integrated circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100583425A CN102196635A (en) | 2011-03-11 | 2011-03-11 | Opening method of output tube of LED drive integrated circuit |
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| CN102196635A true CN102196635A (en) | 2011-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011100583425A Pending CN102196635A (en) | 2011-03-11 | 2011-03-11 | Opening method of output tube of LED drive integrated circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103260288A (en) * | 2012-02-15 | 2013-08-21 | 欧司朗股份有限公司 | Light emitting diode drive device and light emitting diode lamp using light emitting diode drive device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050231133A1 (en) * | 2004-03-15 | 2005-10-20 | Color Kinetics Incorporated | LED power control methods and apparatus |
| CN201131071Y (en) * | 2007-12-20 | 2008-10-08 | 纵领电子(上海)有限公司 | Constant-current drive circuit of LED |
| CN101600277A (en) * | 2009-07-13 | 2009-12-09 | 刘振韬 | A kind of led circuit |
| CN101861022A (en) * | 2010-05-27 | 2010-10-13 | 上海北京大学微电子研究院 | LED driving power and starting method of power tube thereof |
-
2011
- 2011-03-11 CN CN2011100583425A patent/CN102196635A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050231133A1 (en) * | 2004-03-15 | 2005-10-20 | Color Kinetics Incorporated | LED power control methods and apparatus |
| CN201131071Y (en) * | 2007-12-20 | 2008-10-08 | 纵领电子(上海)有限公司 | Constant-current drive circuit of LED |
| CN101600277A (en) * | 2009-07-13 | 2009-12-09 | 刘振韬 | A kind of led circuit |
| CN101861022A (en) * | 2010-05-27 | 2010-10-13 | 上海北京大学微电子研究院 | LED driving power and starting method of power tube thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103260288A (en) * | 2012-02-15 | 2013-08-21 | 欧司朗股份有限公司 | Light emitting diode drive device and light emitting diode lamp using light emitting diode drive device |
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Application publication date: 20110921 |