CN103415126A - Linear bleeder circuit and linear discharging method for LED - Google Patents
Linear bleeder circuit and linear discharging method for LED Download PDFInfo
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- CN103415126A CN103415126A CN2013103836133A CN201310383613A CN103415126A CN 103415126 A CN103415126 A CN 103415126A CN 2013103836133 A CN2013103836133 A CN 2013103836133A CN 201310383613 A CN201310383613 A CN 201310383613A CN 103415126 A CN103415126 A CN 103415126A
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- led
- bleeder circuit
- linear
- pwm controller
- inductance
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Abstract
The invention discloses a linear bleeder circuit and linear discharging method for an LED. The linear bleeder circuit comprises a PWM controller, an LED driving IC, an inductor and the LED which are sequentially connected, wherein a bleeder circuit body is connected between the inductor and the LED. The linear discharging method comprises the steps that when the LED is started, the PWM controller can be reversed to close the bleeder circuit body; when the PWM controller runs at a lower position, the PWM controller can be reversed to start the bleeder circuit body, and follow current generated by the inductor can be consumed by a follow current tube and a power tube. By means of the linear bleeder circuit and linear discharging method, the purpose of linear dimming can be achieved.
Description
Technical field
The present invention relates to the linear bleeder circuit of LED and linear earial drainage method.
Background technology
In order to realize the adjusting of LED brightness, major part is all to control by the PWM technology.As shown in Figure 1, circuit comprises the PWM controller connected successively, the LED drive IC, inductance and LED, in the light modulation process, when the voltage ratio of LED larger, the pulse duration comparison hour of PWM, inductance can produce larger electromotive force and electric current, make LED still have electric current to pass through when the PWM low-voltage, when the PWM trace changes pulse duration, the amount that PWM changes can't change electromotive force and the magnitude of current that inductance produces, only have pulse duration as PWM to be accumulated to after a certain amount of and could change electromotive force and the magnitude of current that inductance produces, therefore, can produce nonlinear curve as shown in Figure 2, on visual angle, cause the variation of LED brightness discontinuous.
Summary of the invention
For solving above-mentioned ended questions, the present invention has improved the linear bleeder circuit of a kind of LED and linear earial drainage method.
The technical scheme solved the problems of the technologies described above is: the linear bleeder circuit of LED comprises PWM controller, LED drive IC, inductance and the LED connected successively, between inductance and LED, be connected with bleeder circuit, described bleeder circuit comprises continued flow tube and the power tube be connected in series, and power tube is controlled by the PWM controller.
The method of utilizing the linear bleeder circuit of above-mentioned LED to carry out linear earial drainage is: when starting LED, after the PWM controller is reverse, close bleeder circuit, when the PWM controller ran to low ground potential, PWM controller reverse starting bleeder circuit, consumed by continued flow tube and power tube the afterflow that inductance produces.
The invention has the beneficial effects as follows: foregoing circuit and method, by continued flow tube and power tube, consume the afterflow that inductance produces, make afterflow without LED, therefore, the afterflow that inductance produces can not have influence on LED, has played the effect of linearity light adjusting.
The accompanying drawing explanation
Fig. 1 is prior art LED circuit block diagram.
Fig. 2 is the current waveform figure that while utilizing the PWM controller to carry out light modulation to LED, LED produces.
Fig. 3 is the linear bleeder circuit block diagram of LED of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further elaborated.
As shown in Figure 3, the linear bleeder circuit of LED comprises PWM controller 1, LED drive IC 2, inductance 3 and the LED 4 connected successively, bleeder circuit 5 is connected between inductance 3 and LED4, described bleeder circuit comprises continued flow tube 51 and the power tube 52 be connected in series, and power tube 52 is controlled by the PWM controller.When starting LED, after PWM controller 1 is reverse, close bleeder circuit, when PWM controller 1 runs to low ground potential, PWM controller 1 reverse starting bleeder circuit, by continued flow tube 51 and power tube 52, consume the afterflow that inductance 3 produces, make afterflow without LED, therefore, the afterflow that inductance produces can not have influence on LED, has played the effect of linearity light adjusting.
Claims (2)
1.LED linear bleeder circuit, comprise the PWM controller, LED drive IC, inductance and the LED that connect successively, it is characterized in that: between inductance and LED, be connected with bleeder circuit, described bleeder circuit comprises continued flow tube and the power tube be connected in series, and power tube is controlled by the PWM controller.
2. one kind is utilized LED linearity bleeder circuit claimed in claim 1 to carry out the method for linear earial drainage, it is characterized in that comprising: when starting LED, after the PWM controller is reverse, close bleeder circuit, when the PWM controller runs to low ground potential, PWM controller reverse starting bleeder circuit, consume by continued flow tube and power tube the afterflow that inductance produces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310383613.3A CN103415126B (en) | 2013-08-29 | 2013-08-29 | LED linear bleeder circuit and linear earial drainage method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310383613.3A CN103415126B (en) | 2013-08-29 | 2013-08-29 | LED linear bleeder circuit and linear earial drainage method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103415126A true CN103415126A (en) | 2013-11-27 |
| CN103415126B CN103415126B (en) | 2016-12-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310383613.3A Active CN103415126B (en) | 2013-08-29 | 2013-08-29 | LED linear bleeder circuit and linear earial drainage method |
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| Country | Link |
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| CN (1) | CN103415126B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105282937A (en) * | 2015-11-13 | 2016-01-27 | 广州市雅江光电设备有限公司 | Switch bleeder circuit and control method thereof |
Citations (5)
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| CN101909376A (en) * | 2009-06-08 | 2010-12-08 | 海洋王照明科技股份有限公司 | High-power LED drive circuit |
| US20110279044A1 (en) * | 2008-04-10 | 2011-11-17 | Fu-Hwa Maiw | High efficiency power drive device enabling serial connection of light emitting diode lamps thereto |
| JP2012084489A (en) * | 2010-10-14 | 2012-04-26 | Koha Co Ltd | Led lighting device and led illuminating device |
| CN102448223A (en) * | 2010-08-24 | 2012-05-09 | 卡西欧计算机株式会社 | Semiconductor light source apparatus and semiconductor light source control method |
| WO2013055000A1 (en) * | 2011-10-10 | 2013-04-18 | 한빔 주식회사 | Led driver circuit |
-
2013
- 2013-08-29 CN CN201310383613.3A patent/CN103415126B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110279044A1 (en) * | 2008-04-10 | 2011-11-17 | Fu-Hwa Maiw | High efficiency power drive device enabling serial connection of light emitting diode lamps thereto |
| CN101909376A (en) * | 2009-06-08 | 2010-12-08 | 海洋王照明科技股份有限公司 | High-power LED drive circuit |
| CN102448223A (en) * | 2010-08-24 | 2012-05-09 | 卡西欧计算机株式会社 | Semiconductor light source apparatus and semiconductor light source control method |
| JP2012084489A (en) * | 2010-10-14 | 2012-04-26 | Koha Co Ltd | Led lighting device and led illuminating device |
| WO2013055000A1 (en) * | 2011-10-10 | 2013-04-18 | 한빔 주식회사 | Led driver circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105282937A (en) * | 2015-11-13 | 2016-01-27 | 广州市雅江光电设备有限公司 | Switch bleeder circuit and control method thereof |
| WO2017080086A1 (en) * | 2015-11-13 | 2017-05-18 | 广州市雅江光电设备有限公司 | Switch bleeder circuit and control method |
| CN105282937B (en) * | 2015-11-13 | 2018-03-02 | 广州市雅江光电设备有限公司 | Switch bleeder circuit and control method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103415126B (en) | 2016-12-28 |
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