CN101861022A - LED driving power and starting method of power tube thereof - Google Patents
LED driving power and starting method of power tube thereof Download PDFInfo
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- CN101861022A CN101861022A CN 201010186708 CN201010186708A CN101861022A CN 101861022 A CN101861022 A CN 101861022A CN 201010186708 CN201010186708 CN 201010186708 CN 201010186708 A CN201010186708 A CN 201010186708A CN 101861022 A CN101861022 A CN 101861022A
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- power tube
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- led driving
- electric current
- drop device
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Abstract
The invention provides an LED driving power and a starting method of a power tube thereof, aiming to solve the problems of EMI (Electro-Magnetic Interference) and the like. The LED driving power comprises a power tube controller, a power tube and a voltage drop device, wherein the voltage drop device is connected with the power tube in series, and current flowing out from the power tube flows into the voltage drop device. The LED driving power is characterized in that the power tube controller concretely comprises a power tube current acquisition module, a power tube starting module and a power tube closing module, wherein the power tube current acquisition module is used for acquiring the current flowing through the power tube; the power tube starting module is used for starting the power tube when the current acquired by the acquisition module is zero; and the power tube closing module is used for closing the power tube when the voltage drop of the voltage drop device reaches a preset valve.
Description
Technical field
The present invention relates to LED field and field of power supplies, relate in particular to the open method of LED driving power and power tube thereof.
Background technology
Switching Power Supply is the main mode of LED driving power, for extraneous power supply is the situation of AC power, the LED driving power 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 driving power has multiple structure at present, but great majority include power tube controller, power tube and resistance, wherein power tube and resistance series connection, and the electric current that power tube flows out flows into resistance, and further flows out by resistance.Wherein the power tube controller comes the power controlling pipe to open according to the fixed frequency of self internal oscillator, and after each the unlatching, when described ohmically pressure drop reaches predetermined value, closes power tube.
But such scheme is normal is to come the power controlling pipe to open with fixed frequency, therefore has serious problems such as electromagnetic interference (EMI).
Summary of the invention
The invention provides the open method of LED driving power and power tube thereof, with problems such as solution EMI.
The invention provides the LED driving power, comprise power tube controller, power tube and drop device, described drop device is connected with power tube, the electric current that flows out power tube flows into drop device, it is characterized in that, described power tube controller specifically comprises: the power tube current acquisition module is used for the electric current of acquisition stream overpower pipe; When power tube opening module, the electric current that is used for collecting at described acquisition module are zero, the starting power pipe; The power tube closing module when being used for pressure drop on described drop device and reaching predetermined value, is closed power tube.
The invention provides the power tube method for controlling opening and closing of LED driving power, comprise step: the electric current of acquisition stream overpower pipe; When the electric current that collects is zero, open power tube.
The present invention is variable by the time that the such scheme that provides makes power tube open, and is the set time to open the EMI problem that power tube causes 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 power controlling pipe, so present embodiment proposes following proposal and comes the variance power pipe opening time, thereby avoided problem such as EMI.
The driving power that present embodiment provides comprises: comprise power tube controller, power tube and drop device, described drop device is connected with power tube, the electric current that flows out power tube flows into drop device, it is characterized in that, described power tube controller, specifically comprise: the power tube current acquisition module is used for the electric current of acquisition stream overpower pipe; When power tube opening module, the electric current that is used for collecting at described acquisition module are zero, the starting power pipe; The power tube closing module when being used for pressure drop on described drop device and reaching predetermined value, is closed power tube.
The power tube method for controlling opening and closing of the LED driving power that another embodiment provides comprises step: the electric current of acquisition stream overpower pipe; When the electric current that collects is zero, open power tube.
Can realize power tube open-interval change by such scheme, thereby avoid problem 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 electric power unit 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～265VAC), 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 power tube 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 open Q1 again, 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 constant power pipe turn-off time, regulate the frequency conversion on ﹠ off operation mode of power tube 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 power tube 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 driving power comprises power tube controller, power tube and drop device, and described drop device is connected with power tube, and the electric current that flows out power tube flows into drop device, it is characterized in that described power tube controller specifically comprises:
The power tube current acquisition module is used for the electric current of acquisition stream overpower pipe;
When power tube opening module, the electric current that is used for collecting at described acquisition module are zero, the starting power pipe;
The power tube closing module when being used for pressure drop on described drop device and reaching predetermined value, is closed power tube.
2. LED driving power as claimed in claim 1 is characterized in that, described drop device is a resistance.
3. LED driving power 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 driving power as claimed in claim 1 is characterized in that, the signal of described LED driving power output is a current signal.
5. LED driving power as claimed in claim 1 is characterized in that, also comprises the detection inductance, and its electric current flows through power tube, and described power tube current acquisition module comes the electric current of acquisition stream overpower pipe by the electric current on the acquisition testing inductance.
6. the power tube method for controlling opening and closing of a LED driving power is characterized in that, comprises step:
The electric current of acquisition stream overpower pipe;
When the electric current that collects is zero, open power tube.
7. method as claimed in claim 6 is characterized in that, also comprises step:
When the pressure drop on the drop device that power tube connects reaches predetermined value, close power tube.
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 gone, and it is characterized in that, the signal of described LED driving power output is a current signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010186708 CN101861022A (en) | 2010-05-27 | 2010-05-27 | LED driving power and starting method of power tube thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010186708 CN101861022A (en) | 2010-05-27 | 2010-05-27 | LED driving power and starting method of power tube thereof |
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| Publication Number | Publication Date |
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| CN101861022A true CN101861022A (en) | 2010-10-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201010186708 Pending CN101861022A (en) | 2010-05-27 | 2010-05-27 | LED driving power and starting method of power tube thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102196635A (en) * | 2011-03-11 | 2011-09-21 | 苏州卓能微电子技术有限公司 | Opening method of output tube of LED drive integrated circuit |
| CN102621399A (en) * | 2012-04-23 | 2012-08-01 | 欧阳斌林 | Inductance measuring method based on switching circuit |
| CN102768316A (en) * | 2012-08-01 | 2012-11-07 | 东北农业大学 | Switching mutual inductance value measurement method used in discharging process of constant-current source charging diodes |
| CN103025012A (en) * | 2012-12-07 | 2013-04-03 | 华南理工大学 | Light emitting diode (LED) pulse drive circuit and drive method thereof |
| CN103065583A (en) * | 2011-10-19 | 2013-04-24 | 三星电子株式会社 | Led driving apparatus, method for driving led, and display apparatus thereof |
| CN104467422A (en) * | 2014-12-22 | 2015-03-25 | 英飞特电子（杭州）股份有限公司 | Constant-current Buck converter and constant-current control circuit thereof |
| CN106028518A (en) * | 2016-06-14 | 2016-10-12 | 上海芯迈科技有限公司 | LED linear drive topology |
| CN109061272A (en) * | 2018-08-30 | 2018-12-21 | 广州金升阳科技有限公司 | A kind of current detection circuit |
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| 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 |
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2010
- 2010-05-27 CN CN 201010186708 patent/CN101861022A/en active Pending
Patent Citations (3)
| 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 |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102196635A (en) * | 2011-03-11 | 2011-09-21 | 苏州卓能微电子技术有限公司 | Opening method of output tube of LED drive integrated circuit |
| CN103065583A (en) * | 2011-10-19 | 2013-04-24 | 三星电子株式会社 | Led driving apparatus, method for driving led, and display apparatus thereof |
| CN102621399A (en) * | 2012-04-23 | 2012-08-01 | 欧阳斌林 | Inductance measuring method based on switching circuit |
| CN102621399B (en) * | 2012-04-23 | 2014-07-02 | 欧阳斌林 | Inductance measuring method based on switching circuit |
| CN102768316A (en) * | 2012-08-01 | 2012-11-07 | 东北农业大学 | Switching mutual inductance value measurement method used in discharging process of constant-current source charging diodes |
| CN102768316B (en) * | 2012-08-01 | 2015-04-08 | 东北农业大学 | Switching mutual inductance value measurement method used in discharging process of constant-current source charging diodes |
| CN103025012B (en) * | 2012-12-07 | 2014-12-03 | 华南理工大学 | Light emitting diode (LED) pulse drive circuit and drive method thereof |
| CN103025012A (en) * | 2012-12-07 | 2013-04-03 | 华南理工大学 | Light emitting diode (LED) pulse drive circuit and drive method thereof |
| CN104467422A (en) * | 2014-12-22 | 2015-03-25 | 英飞特电子（杭州）股份有限公司 | Constant-current Buck converter and constant-current control circuit thereof |
| CN106028518A (en) * | 2016-06-14 | 2016-10-12 | 上海芯迈科技有限公司 | LED linear drive topology |
| CN106028518B (en) * | 2016-06-14 | 2017-12-19 | 上海芯迈科技有限公司 | A kind of LED linear driving topology |
| CN109061272A (en) * | 2018-08-30 | 2018-12-21 | 广州金升阳科技有限公司 | A kind of current detection circuit |
| CN109061272B (en) * | 2018-08-30 | 2020-08-18 | 广州金升阳科技有限公司 | Current detection circuit |
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Application publication date: 20101013 |