CN103152911B - Control circuit of light emitting diode with self-adaptive adjustment - Google Patents
Control circuit of light emitting diode with self-adaptive adjustment Download PDFInfo
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- CN103152911B CN103152911B CN201310025954.3A CN201310025954A CN103152911B CN 103152911 B CN103152911 B CN 103152911B CN 201310025954 A CN201310025954 A CN 201310025954A CN 103152911 B CN103152911 B CN 103152911B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
A control circuit of a light emitting diode with self-adaptive adjustment comprises a driver, a counter and a controller. The control circuit of the light emitting diode is used for controlling a plurality of light-emitting units; each light-emitting unit comprises at least one light emitting diode and a switch. The driver receives an alternative current signal and outputs a driving signal; the light-emitting units are lightened by the driving signal. The counter starts to count from a initial value according to regarding a voltage value of the driving signal as a reference value, the controller controls switches of at least one light-emitting unit in order to enable the light emitting diode of the light-emitting unit to receive the driving signal according to that a value of the counter reaches a scheduled value. When the light emitting diode of the light-emitting unit receives the driving signal, the controller detects whether the light-emitting unit is lightened and adjusts the scheduled value. A drive control of the light emitting diode is done by the counter and count of the counter is adjusted timely so as to control the time of lightening the light-emitting unit accurately.
Description
Technical field
The present invention about a kind of LED control circuit, more particularly, about a kind of LED control circuit of tool self-adaptative adjustment.
Background technology
From illumination market face light-emitting diode (light emitting diode, LED) application, because it has that volume is little, power saving, luminously to drive fast and the advantage such as luminescent lifetime is longer, therefore there is more and more lighting device by light-emitting diode to replace traditional lighting source.In general, light-emitting diode operates under forward voltage, its two ends are crossed with a critical voltage value, when the voltage that a power supply applies exceedes critical voltage value, light-emitting diode just can be stimulated and externally send visible ray, the brightness of visible ray is proportional to the electric current flowing through light-emitting diode, along with electric current increases, the brightness of light-emitting diode is brighter, but, often electric current fixed under the application of reality or be limited within specific numerical value, except can maintaining consistent and stable luminosity, also can extend the useful life of light-emitting diode.
Please refer to Fig. 1, Fig. 1 is the schematic diagram of the LED driving circuit of prior art.TaiWan, China issued patents case I220047 discloses a kind of LED driving circuit 10, and it can by the forward part voltage Direct driver light-emitting diode of supply power supply under without the design of filter capacitor.LED driving circuit 10 comprises the conduct current control circuit 13 that supply power supply 11, bridge rectifier 12, is made up of multiple current control unit I1-In, and is used for detecting the voltage detection circuit 14 of voltage quasi position of supply power supply 11.When voltage detection circuit 14 detect alternating voltage be greater than the conducting voltage of diode D1 time, current control unit I1 conducting is to light diode D1.Then, when voltage detection circuit 14 detect alternating voltage be greater than the conducting voltage of diode D1 and D2 time, current control unit I1 end and another current control unit I2 conducting to light diode D1 and D2.
In this framework, due to the conducting that light-emitting diode D1-Dn can repeat on different current paths, but it is also not identical that light-emitting diode D1-Dn respectively goes here and there time of conducting, cause light-emitting diode D1-Dn cannot have identical brightness, and because of the time length difference that electric current passes through, cause different attenuation effects, so after long-term use, each string light-emitting diode will manifest uneven luminosity problem.
Summary of the invention
Therefore, an object of the present invention is the LED control circuit providing a kind of tool self-adaptative adjustment, to control more accurately and to drive light-emitting diode.
The LED control circuit of tool self-adaptative adjustment of the present invention, in order to control multiple luminescence unit, each luminescence unit comprises at least one light-emitting diode and a switch, this LED control circuit comprises: a driver, in order to receive an AC signal to export a drive singal, light those luminescence units by this drive singal; One counter, during in order to be a fiducial value according to the magnitude of voltage of this drive singal, starts counting from an initial value; And a controller, during in order to arrive a predetermined number according to the counting of this counter, the switch controlling at least one luminescence unit makes the light-emitting diode of this luminescence unit receive this drive singal; Wherein, when the light-emitting diode of this luminescence unit receives this drive singal, whether this controller is detected this luminescence unit and is lit, and adjusts this predetermined number according to this.
Wherein, when the magnitude of voltage of this drive singal rises, be lit if this controller detects this luminescence unit, reduce this predetermined number, be not lit if this controller detects this luminescence unit, increase this predetermined number.When the magnitude of voltage of this drive singal declines, be lit if this controller detects this luminescence unit, increase this predetermined number, be not lit if this controller detects this luminescence unit, reduce this predetermined number.
According to one embodiment of present invention, those luminescence units are for being connected in series, and each luminescence unit comprises multiple light-emitting diode be connected in series, and this switch in parallel is connected to the light-emitting diode of the plurality of series connection.
Wherein, when this controller arrives this predetermined number according to the counting of this counter, the switch disconnecting at least one luminescence unit makes the light-emitting diode of this luminescence unit receive this drive singal.
Wherein, at this counter during this initial value starts counting, the number of times that the switch of each luminescence unit is disconnected by this controller is identical.
According to another embodiment of the invention, those luminescence units are for being connected in parallel, and each luminescence unit comprises multiple light-emitting diode be connected in series, and this switch is connected in series in the light-emitting diode of the plurality of series connection.
Wherein, when this controller arrives this predetermined number according to the counting of this counter, the switch of at least one luminescence unit of conducting makes the light-emitting diode of this luminescence unit receive this drive singal.
Wherein, at this counter during this initial value starts counting, the switch of each luminescence unit is identical by the number of times of this controller conducting.
Beneficial effect of the present invention is, LED control circuit of the present invention comprises a driver, one counter and a controller, LED control circuit is in order to control multiple luminescence unit, each luminescence unit comprises at least one light-emitting diode and a switch, driver receives AC signal with output drive signal, luminescence unit is lighted by drive singal, when counter is fiducial value according to the magnitude of voltage of drive singal, self reset starts counting, when controller arrives predetermined number according to the counting of counter, the switch controlling at least one luminescence unit makes the light-emitting diode of luminescence unit receive drive singal, when the light-emitting diode of luminescence unit receives drive singal, whether controller detecting luminescence unit is lit, and adjust predetermined number according to this.The LED control circuit of tool self-adaptative adjustment of the present invention utilizes counter to carry out the drived control of light-emitting diode, and the counting of instant adjustment counter, reach the time controlling to light luminescence unit more accurately.
Accompanying drawing explanation
Fig. 1: be the schematic diagram of the LED driving circuit of prior art.
Fig. 2: be the schematic diagram of the first embodiment of LED control circuit of the present invention.
Fig. 3: the schematic diagram being the time sequential routine of the LED control circuit of the first embodiment.
Fig. 4: be the schematic diagram of the second embodiment of LED control circuit of the present invention.
Fig. 5: the schematic diagram being the time sequential routine of the LED control circuit of the second embodiment.
Embodiment
Please refer to Fig. 2, Fig. 2 is the schematic diagram of the first embodiment of LED control circuit of the present invention.LED control circuit 20 is in order to control multiple luminescence unit L1-L4, and LED control circuit 20 comprises driver 21, counter 22 and a controller 23.In a first embodiment, four groups of luminescence unit L1-L4 are for being connected in series, each luminescence unit comprises two light-emitting diodes be connected in series, and switch in parallel is connected to the light-emitting diode of multiple series connection, and such as luminescence unit L1 comprises light-emitting diode G1 and switch P 1.Driver 21 receives AC signal Vac, and halfwave rectifier or full-wave rectification are carried out to AC signal Vac, with output drive signal Vin, controller 23 by disconnecting the switch P 1-P4 of luminescence unit, drive singal Vin to be sent to the light-emitting diode G1-G4 of multiple series connection.When counter 22 is fiducial value (being generally zero) according to the magnitude of voltage of drive singal Vin, counting is started from initial value (being generally zero), when the counting of counter 22 arrives predetermined number, the switch that controller 23 disconnects at least one luminescence unit makes the light-emitting diode of luminescence unit receive drive singal, and detect luminescence unit and whether be lit, adjust predetermined number according to this.
After AC signal Vac carries out halfwave rectifier or full-wave rectification via driver 21, the drive singal Vin of generation is half-sine wave, and the magnitude of voltage of larger drive singal Vin can drive the light-emitting diode of more series connection.Because when the switch of more than two luminescence units is disconnected simultaneously, the light-emitting diode of luminescence unit will all be connected in series, so controller 23 can light the number of luminescence unit according to the voltage value of drive singal Vin, and control the time of lighting luminescence unit by counter 22, when the counting of counter 22 arrives predetermined number, drive singal is sent to light-emitting diode by the switch that controller 23 disconnects luminescence unit, as long as usually can learn whether luminescence unit is lit by the electric current of detecting light-emitting diode.Therefore, the LED control circuit 20 of tool self-adaptative adjustment of the present invention utilizes counter 22 to carry out the drived control of light-emitting diode, and whether be lit by detecting luminescence unit, adjust the counting of counter 22 according to this, to control the time of lighting luminescence unit more accurately.
Please refer to Fig. 3 A to Fig. 3 C, Fig. 3 A to Fig. 3 C is the schematic diagram in the time sequential routine of the LED control circuit 20 of the first embodiment.In figure, ordinate represents magnitude of voltage, and abscissa represents the time.As shown in Figure 3A, when the magnitude of voltage of drive singal Vin is zero, counter starts counting from counting T0.Symbol below half-sine wave represents the luminescence unit that controller 23 is lighted, and now, other luminescence units are then closed, such as, in time counting T4, and controller 23 cut-off switch P1, P2, P3, P4, and detect luminescence unit L1, L2, L3, L4 and whether be lit.In a first embodiment, during counter 22 starts counting from zero, namely in the drive singal Vin of a half-sine wave, the number of times that the switch P 1-P4 of each luminescence unit L1-L4 is opened by controller 23 is identical, the benefit of such arrangement is that the time difference that each luminescence unit is lit is less, and light-emitting diode luminance is more even.
During counting T0 with counting T5, the magnitude of voltage of drive singal Vin rises, if controller 23 detects luminescence unit and is lit during this, then reduces predetermined number, is not lit, then increases predetermined number if controller 23 detects luminescence unit.Such as, the predetermined number of counting T2 is 256, when the counting of counter 22 arrives 256, controller 23 cut-off switch P1, P2, and detect luminescence unit L1, L2 and whether be lit, be lit if controller 23 detects luminescence unit L1, L2, then the predetermined number of counting T2 be adjusted to 255, if controller 23 detects luminescence unit L1, L2 and is not lit, then the predetermined number of counting T2 is adjusted to 257.
On the other hand, during counting T5 with counting T9, the magnitude of voltage of drive singal Vin declines, if controller 23 detects luminescence unit and is lit during this, then increases predetermined number, is not lit, then reduces predetermined number if controller 23 detects luminescence unit.Such as, the predetermined number of counting T7 is 896, when the counting of counter 22 arrives 896, controller 23 cut-off switch P3, P4, and detect luminescence unit L3, L4 and whether be lit, be lit if controller 23 detects luminescence unit L3, L4, then the predetermined number of counting T7 be adjusted to 897, if controller 23 detects luminescence unit L3, L4 and is not lit, then the predetermined number of counting T7 is adjusted to 895.
Compared to prior art, LED control circuit 20 of the present invention when the change in voltage of AC power or the conducting voltage drift of light-emitting diode time can self-adaptative adjustment to optimized drived control.As seen in figure 3b, the self-adaptative adjustment that carries out when the change in voltage of AC power of controller 23.When AC power is stablized, controller 23 is at predetermined number 256 cut-off switch P1, P2, now the magnitude of voltage of drive singal 31 has been greater than the turn-on voltage of light-emitting diode, at next cycle, controller 23 will at predetermined number 255 cut-off switch P1, P2, because the magnitude of voltage of drive singal 32 has been less than the turn-on voltage of light-emitting diode, predetermined number has been adjusted to 256 again.When AC power instability causes drive singal 33 to diminish, controller 23 increases predetermined number in the cycle afterwards, when controller 23 is at predetermined number 260 cut-off switch P1, P2, the magnitude of voltage of drive singal 34 is greater than the turn-on voltage of light-emitting diode, now again predetermined number is adjusted to 259.
As shown in Figure 3 C, the self-adaptative adjustment that carries out when the conducting voltage drift of light-emitting diode of controller.Controller 23 is at predetermined number 896 cut-off switch P3, P4, now the magnitude of voltage of drive singal 36 has been greater than the turn-on voltage of light-emitting diode, at next cycle, controller will at predetermined number 897 cut-off switch P3, P4, because the magnitude of voltage of drive singal 37 has been less than the turn-on voltage of light-emitting diode, predetermined number has been adjusted to 896 again.When the conducting voltage drift of light-emitting diode, the magnitude of voltage of drive singal 38 is greater than the turn-on voltage of light-emitting diode, controller 23 increases predetermined number in the cycle afterwards, when controller is at predetermined number 900 cut-off switch P3, P4, the magnitude of voltage of drive singal 39 is greater than the turn-on voltage of light-emitting diode, now again predetermined number is adjusted to 899.
From the adjustment of above-mentioned predetermined number, LED control circuit 20 of the present invention is when operating, even if predetermined number and optimal number have comparatively big error time initial, but controller 23 is after whether detecting luminescence unit is lit and adjusts predetermined number according to this, predetermined number will be adjusted to optimal number gradually, in other words, in the face of the variation of signal, LED control circuit can self-adaptative adjustment.Moreover, the accuracy of switch control rule is determined by the numerical ability of counter, such as counter count enable per second 1,000,000 times, then the accuracy of switch control rule can reach microsecond, therefore, LED control circuit of the present invention is also very easy to control accuracy.
Please refer to Fig. 4, Fig. 4 is the schematic diagram of the second embodiment of LED control circuit of the present invention.In a second embodiment, LED control circuit 40 controls four groups of luminescence unit U1-U4 for being connected in parallel, first to fourth group of luminescence unit U1-U4 comprises one to four light-emitting diode be connected in series respectively, and switch is connected in series in light-emitting diode C1-C4.Driver 41 receives AC signal Vac with output drive signal Vin, controller 43 by the switch N1-N4 of conducting luminescence unit U1-U4, so that drive singal Vin is sent to light-emitting diode C1-C4.Identical with the first embodiment is, when counter 42 is fiducial value (being generally zero) according to the magnitude of voltage of drive singal Vin, counting is started from initial value (being generally zero), when the counting of counter 42 arrives predetermined number, the switch of at least one luminescence unit of controller 43 conducting makes the light-emitting diode of luminescence unit receive drive singal, and detect luminescence unit and whether be lit, adjust predetermined number according to this.
Please refer to Fig. 5, Fig. 5 is the schematic diagram in the time sequential routine of the LED control circuit 40 of the second embodiment.Because four groups of luminescence unit U1-U4 have the light-emitting diode of different serial number, so the luminescence unit that controller 43 can be lighted according to the voltage value of drive singal Vin, and control the time of lighting luminescence unit by counter 42.Such as, in time counting T1, controller 43 actuating switch N1, if controller 43 detects luminescence unit U1 and is not lit, then increase the predetermined number of counting T1, along with the magnitude of voltage of drive singal Vin rises, in time counting T3, controller 43 actuating switch N3, if controller 43 detects luminescence unit U3 and is lit, then reduce the predetermined number of counting T3, after exceeding counting T5, the magnitude of voltage of drive singal Vin declines, in time counting T7, controller 43 actuating switch N2, if controller 43 detects luminescence unit U2 and is lit, then increase the predetermined number of counting T7, if controller 43 detects luminescence unit U2 and is not lit, then reduce the predetermined number of counting T7.In addition, the light-emitting diode quantity that controller 43 has according to luminescence unit U1-U4 is lighted in proper order, and during counter 42 starts counting from zero, the switch N1-N4 of each luminescence unit U1-U4 is identical by the number of times of controller 43 conducting.
The foregoing is only preferred embodiment of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (7)
1. a LED control circuit for tool self-adaptative adjustment, in order to control multiple luminescence unit, is characterized in that, each luminescence unit comprises at least one light-emitting diode and a switch, and this LED control circuit comprises:
One driver, in order to receive an AC signal to export a drive singal, lights those luminescence units by this drive singal;
One counter, during in order to be a fiducial value according to the magnitude of voltage of this drive singal, starts counting from an initial value; And
One controller, during in order to arrive a predetermined number according to the counting of this counter, the switch controlling at least one luminescence unit makes the light-emitting diode of this luminescence unit receive this drive singal;
Wherein, when the light-emitting diode of this luminescence unit receives this drive singal, whether this controller is detected this luminescence unit and is lit, when the magnitude of voltage of this drive singal rises, if this controller detects this luminescence unit and is lit, reduce this predetermined number, be not lit if this controller detects this luminescence unit, increase this predetermined number; When the magnitude of voltage of this drive singal declines, be lit if this controller detects this luminescence unit, increase this predetermined number, be not lit if this controller detects this luminescence unit, reduce this predetermined number.
2. LED control circuit as claimed in claim 1, it is characterized in that, those luminescence units are for being connected in series, and each luminescence unit comprises multiple light-emitting diode be connected in series, and this switch in parallel is connected to the light-emitting diode of the plurality of series connection.
3. LED control circuit as claimed in claim 2, it is characterized in that, when this controller arrives this predetermined number according to the counting of this counter, the switch disconnecting at least one luminescence unit makes the light-emitting diode of this luminescence unit receive this drive singal.
4. LED control circuit as claimed in claim 3, is characterized in that, at this counter during this initial value starts counting, the number of times that the switch of each luminescence unit is disconnected by this controller is identical.
5. LED control circuit as claimed in claim 1, it is characterized in that, those luminescence units are for being connected in parallel, and each luminescence unit comprises multiple light-emitting diode be connected in series, and this switch is connected in series in the light-emitting diode of the plurality of series connection.
6. LED control circuit as claimed in claim 5, it is characterized in that, when this controller arrives this predetermined number according to the counting of this counter, the switch of at least one luminescence unit of conducting makes the light-emitting diode of this luminescence unit receive this drive singal.
7. LED control circuit as claimed in claim 5, is characterized in that, at this counter during this initial value starts counting, the switch of each luminescence unit is identical by the number of times of this controller conducting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310025954.3A CN103152911B (en) | 2013-01-21 | 2013-01-21 | Control circuit of light emitting diode with self-adaptive adjustment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310025954.3A CN103152911B (en) | 2013-01-21 | 2013-01-21 | Control circuit of light emitting diode with self-adaptive adjustment |
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| CN103152911A CN103152911A (en) | 2013-06-12 |
| CN103152911B true CN103152911B (en) | 2015-02-18 |
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| CN201310025954.3A Active CN103152911B (en) | 2013-01-21 | 2013-01-21 | Control circuit of light emitting diode with self-adaptive adjustment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT16963U1 (en) * | 2015-11-19 | 2021-01-15 | Zumtobel Lighting Gmbh |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102018118876A1 (en) * | 2018-08-03 | 2020-02-06 | HELLA GmbH & Co. KGaA | Method and means for setting a current source for a light emitting diode array |
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| CN101137261A (en) * | 2006-08-29 | 2008-03-05 | 安华高科技Ecbuip(新加坡)私人有限公司 | Device and method for driving LED |
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| JP4581646B2 (en) * | 2004-11-22 | 2010-11-17 | パナソニック電工株式会社 | Light emitting diode lighting device |
| CN102804923A (en) * | 2009-06-11 | 2012-11-28 | 松下电器产业株式会社 | Lighting device and lighting system |
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- 2013-01-21 CN CN201310025954.3A patent/CN103152911B/en active Active
Patent Citations (4)
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|---|---|---|---|---|
| TWI220047B (en) * | 2003-03-14 | 2004-08-01 | Add Microtech Corp | LED driving circuit |
| CN101137261A (en) * | 2006-08-29 | 2008-03-05 | 安华高科技Ecbuip(新加坡)私人有限公司 | Device and method for driving LED |
| CN101155448A (en) * | 2006-09-29 | 2008-04-02 | 启萌科技有限公司 | Illuminating device and driving method thereof |
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| AT16963U1 (en) * | 2015-11-19 | 2021-01-15 | Zumtobel Lighting Gmbh |
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| CN103152911A (en) | 2013-06-12 |
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