CN101636019B - Active multi-channel LED driving power source system - Google Patents
Active multi-channel LED driving power source system Download PDFInfo
- Publication number
- CN101636019B CN101636019B CN 200810129944 CN200810129944A CN101636019B CN 101636019 B CN101636019 B CN 101636019B CN 200810129944 CN200810129944 CN 200810129944 CN 200810129944 A CN200810129944 A CN 200810129944A CN 101636019 B CN101636019 B CN 101636019B
- Authority
- CN
- China
- Prior art keywords
- interval
- circuit
- voltage
- power
- led
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The invention provides an active multi-channel LED power source drive system. The optimal layout of the whole system comprises seven operation sections; a power source is led in from the first section, and is rectified and filtered through an EMC circuit; the second section carries out voltage transformation processing on the power source after the power is adjusted and improved through a PWM circuit; then the fourth section shunts the power source through multiple channels after the optimal power is formed by the rectification and filtration of a constant-current voltage-stabilizing control circuit of the third section; an intermittent modulation circuit of the fifth section modulates the prior DC power supply output into intermittent electric power of which the output frequency and cycle width can be controlled; then the power source is output to an LED luminous module of the sixth section for light source starting operation; simultaneously, the seventh section is provided with an environmental parameter detector used for returning a temperature parameter of the LED luminous module to the constant-current voltage-stabilizing control circuit of the third section to adjust and judge an output voltage and current curve so as to achieve the aim of improving electronic heat dissipation rate and energy efficiency again.
Description
Technical field
The present invention relates to a kind of LED driving power source system, relate in particular to a kind of active multi-channel LED driving power source system.
Background technology
The driving power source system output mode of general LED (light-emitting diode) has three kinds haply, and one is CVMode (constant voltage mode), and it two is CC Mode (constant current mode), is CC﹠amp at last; CV Mode (constant voltage/constant current coexistance model), yet above power drives all can't be accomplished operating voltage and the current point of ACTIVE CONTROL LED the best, and because variation or the LED light fixture heat dissipation design of climate temperature are bad, and under uncontrollable variation of ambient temperature situation, cause the overheated unfavorable situation of LED easily, LED luminosity and energy efficiency are reduced, even the situation that causes the LED light emitting module to burn.
Figure 1 shows that the existing CC﹠amp of employing; The LED driving power source system schematic diagram of CV Mode (constant voltage/constant current coexistance model), it is interval that it mainly comprises four runnings, power supply imports by first interval 10, and carry out rectifying and wave-filtering again by behind PWM circuit (pulse-width modulator) 13 its power of adjustment lifting (operating efficiency of its power supply unit can being promoted to more than 80%) by EMC circuit 11 (electromagnetic compatibility circuit) earlier, carry out transformation by the transformer 21 in second interval 20 and handle, again by the CC﹠amp in the 3rd interval 30; After CV (constant current voltage stabilizing) control circuit 31 rectifying and wave-filterings form best power, export between the area postrema 60 light emitting module 61 to.Finding like this, the complete dereliction innervation of described driving power source system is answered ambient temperature and is done the design that suitable adjustment is exported, therefore cause the overheated unfavorable situation of LED easily, LED luminosity and energy efficiency are reduced, even the situation generation that causes the LED light emitting module to burn, therefore improved necessity arranged.
Summary of the invention
Main purpose of the present invention is to provide a kind of active multi-channel LED driving power source system, particularly research and develop at the high-capacity LED light fixture, under System Operation, can reach the lifting again of electronic type rate of heat dissipation and energy efficiency, allow the LED light fixture can bring into play maximum efficiency.
For achieving the above object, the invention provides a kind of active multi-channel LED driving power source system, described system comprises between first interval, second interval, the 3rd interval, the 4th interval, the 5th interval, the 6th interval and SECTOR-SEVEN;
Wherein, described first interval has EMC circuit and PWM circuit, described second interval has transformer, described the 3rd interval has constant current voltage stabilizing circuit, described the 4th interval has a plurality of multichannel followers, described the 5th interval has and modulates circuit the intermittence of number such as described multichannel follower, and described the 6th interval has and the LED light emitting module of modulating number such as circuit described intermittence, is provided with the environmental parameter detector between described SECTOR-SEVEN;
Described first interval, described second interval, described the 3rd interval, described the 4th interval, the described the 5th intervally are connected successively with described the 6th interval, are connected between the described the 3rd interval and described SECTOR-SEVEN;
Power supply through described second interval, enters described the 3rd interval after being imported by described first interval again, imports described the 5th interval via the described the 4th interval back again, exports described the 6th interval immediately to.
The present invention also provides a kind of active multi-channel LED power drives system,
Described system comprises between first interval, second interval, the 3rd interval, the 5th interval, the 6th interval and SECTOR-SEVEN;
Wherein, described first interval has EMC circuit and PWM circuit, described second interval has transformer, described the 3rd interval has constant current voltage stabilizing circuit, described the 5th interval has intermittently modulates circuit, described the 6th interval has and the LED light emitting module of modulating number such as circuit described intermittence, is provided with the environmental parameter detector between described SECTOR-SEVEN;
Described first interval, described second interval, described the 3rd interval, the described the 5th intervally are connected successively with described the 6th interval, are connected between the described the 3rd interval and described SECTOR-SEVEN;
Power supply enters described the 3rd interval again by described first interval the importing by described second interval, imports described the 5th interval again, exports described the 6th interval immediately to.
The present invention also provides a kind of active multi-channel LED power drives system, and described system comprises between first interval, second interval, the 3rd interval, the 4th interval, the 6th interval and SECTOR-SEVEN;
Wherein, described first interval has EMC circuit and PWM circuit, described second interval has transformer, described the 3rd interval has constant current voltage stabilizing circuit, described the 4th interval comprises a plurality of multichannel followers, described the 6th interval comprises the LED light emitting module, comprises the environmental parameter detector between described SECTOR-SEVEN;
Described first interval, described second interval, described the 3rd interval, the described the 4th intervally are connected successively with described the 6th interval, are connected between the described the 3rd interval and described SECTOR-SEVEN;
Power supply enters described the 3rd interval again by described first interval the importing by described second interval, imports described the 4th interval again, exports described the 6th interval immediately to.
The present invention also provides a kind of active multi-channel LED power drives system,
Described system comprises between first interval, second interval, the 3rd interval, the 6th interval and SECTOR-SEVEN;
Wherein, described first interval has EMC circuit and PWM circuit, and described second interval has transformer, and described the 3rd interval has constant current voltage stabilizing circuit, and described the 6th interval has the LED light emitting module, comprises the environmental parameter detector between described SECTOR-SEVEN;
Described first interval, described second interval, the described the 3rd intervally are connected successively with described the 6th interval, are connected between the described the 3rd interval and described SECTOR-SEVEN;
Power supply enters described the 3rd interval again by described first interval the importing by described second interval, exports described the 6th interval immediately to.
The present invention also provides a kind of active multi-channel LED power drives system,
Described system comprises first interval, second interval, the 3rd interval, the 4th interval, the 5th interval, the 6th interval;
Wherein, described first interval has EMC circuit and PWM circuit, described second interval has transformer, described the 3rd interval has constant current voltage stabilizing circuit, described the 4th interval has a plurality of multichannel followers, described the 5th interval has and modulates circuit the intermittence of number such as described multichannel follower, and described the 6th interval has and the LED light emitting module of modulating number such as circuit described intermittence;
Described first interval, described second interval, described the 3rd interval, described the 4th interval, described the 5th interval are connected successively with described the 6th interval;
Power supply enters described the 3rd interval again by described first interval the importing by described second interval, imports described the 5th interval via the described the 4th interval back again, exports described the 6th interval immediately to.
Compared with prior art, active multi-channel LED driving power source system of the present invention can reach the lifting again of electronic type rate of heat dissipation and energy efficiency, allows the LED light fixture can bring into play its maximum efficiency.
Description of drawings
Fig. 1 is the existing CC﹠amp of employing; The LED driving power source system schematic diagram of CV Mode;
Fig. 2 is the described active multi-channel LED power drives of first embodiment of the invention system schematic;
Fig. 3 is second kind of described active multi-channel LED power drives of embodiment of the present invention system schematic;
Fig. 4 is the described active multi-channel LED power drives of the third embodiment of the present invention system schematic;
Fig. 5 is the 4th kind of described active multi-channel LED power drives of embodiment of the present invention system schematic;
Fig. 6 is the 5th kind of described active multi-channel LED power drives of embodiment of the present invention system schematic.
Embodiment
For making purpose of the present invention, structural feature and function thereof there are further understanding, cooperate related embodiment and accompanying drawing to be described in detail as follows:
The invention provides a kind of active multi-channel LED power drives system, it mainly is the operation system at the designed driving power of high-power led light source equipment, it is interval that whole system includes seven runnings, as shown in Figure 2, the described active multi-channel LED power drives of embodiment of the invention system, comprise first interval 10, second interval 20, the 3rd interval 30, the 4th interval 40, the 5th interval 50, the the 6th interval 60 and SECTOR-SEVEN between 70, described first interval 10, described second interval 20, described the 3rd interval 30, described the 4th interval 40, the the described the 5th interval 50 is connected successively with described the 6th interval 60, and 70 are connected between described the 3rd interval 30 and described SECTOR-SEVEN;
Described first interval 10 has EMC circuit (electromagnetic compatibility circuit) 11, SW (controlling selector automatically) 12 and PWM circuit (pulse width modulation circuit) 13;
Described second interval 20 has transformer 21;
Described the 3rd interval 30 has CC﹠amp; CV control circuit (constant voltage current stabilization control circuit) 31;
Described the 4th interval 40 has a plurality of multichannel followers 41;
Described the 5th interval 50 has and modulates circuit 51 intermittence of described multichannel follower 41 numbers such as grade;
Described the 6th interval 60 has and the LED light emitting module of modulating circuit 51 numbers such as grade described intermittence;
70 are provided with environmental parameter detector 71 between described SECTOR-SEVEN;
Power supply via described second interval 20, described the 3rd interval 30, described the 4th interval 40, described the 5th interval 50, exports described the 6th interval 60 to after importing by described first interval 10 successively immediately.
As mentioned above, the present invention mainly sets up a kind of active multi-channel LED driving power source system, wherein, power supply imports by described first interval 10, earlier carry out rectification by EMC circuit (electromagnetic compatibility circuit) 11, judged by SW (controlling selector automatically) 12 after the filtering, with behind electric current and voltage importing PWM circuit (pulse width modulation circuit) 13 its power of adjustment lifting of usefulness deficiency (operating efficiency of its power supply unit can being promoted to more than 80%), transformer 21 by described second interval 20 carries out the transformation processing, after forming best power by constant current voltage stabilizing control circuit 31 rectifying and wave-filterings in described the 3rd interval 30 again, (its mode is to be 10V by the described the 3rd interval 30 current/voltage that imports for example with the shunting of multichannel equal proportion usefulness by a plurality of multichannel followers 41 in described the 4th interval 40, and be split into each 5V by two multichannel followers 41 in described the 4th interval 40), again electric current is imported in described the 5th interval 50 and modulate circuit 51 intermittence of described multichannel follower 41 numbers such as grade, after the output of the power supply of former direct current is modulated into the intermittent electric power that can control output frequency and periodic width, exports to again and carry out light source with LED (light-emitting diode) light emitting module 61 of modulating circuit 51 numbers such as grade described intermittence in described the 6th interval 60 and start running; And the mode that this kind intermittently modulated is, wherein one intermittently modulate circuit 51 and integrate and receive anodal current/voltage of each 5V that two multichannel followers 41 by described the 4th interval 40 are split into by described the 5th interval 50, and formation 10V, export the described the 6th interval 60 again to for a wherein LED light emitting module 61 startups, and another is intermittently modulated circuit 51 and integrates and receive each 5V cathodal current voltage that two multichannel followers 41 by described the 4th interval 40 are split into and form 10V, export the described the 6th interval 60 again to for another LED light emitting module 61 startups, modulating circuit 51 described two intermittences is not that output simultaneously starts two LED light emitting modules 61 simultaneously, but with the utmost point intermittently interactive mode output of moment, certainly two LED light emitting modules 61 in described the 6th interval 60 also are that light source is sent in interactive mode startup at intermittence moment, this moment intermittently mutual light source be that vision can't be discovered, therefore the described the 6th interval 60 shown be a kind of very natural light source; 70 environmental parameter detector 71 can detect whole system and ambient temperature variation between described SECTOR-SEVEN in addition, and the output voltage current curve of described system is adjusted and judged to the temperature coefficient of repayment LED light emitting module 61 to the constant current voltage stabilizing control circuit 31 in described the 3rd interval 30; Can reach active electric minor rate of heat dissipation and multichannel shunting output like this to promote energy efficiency, allow the LED light fixture can bring into play its maximum efficiency, and do not have the unfavorable situation that causes LED overheated, and LED luminosity and energy efficiency are reduced, even the situation that causes the LED light emitting module to burn produces.
See also and Figure 3 shows that second kind of embodiment of the present invention, be characterized in that above-mentioned LED power drives system saves the described the 4th interval 40 and a plurality of multichannel follower 41, and after directly forming best power by constant current voltage stabilizing control circuit 31 rectifying and wave-filterings in described the 3rd interval 30, by after modulating circuit 51 intermittence in described the 5th interval 50 output of the power supply of former direct current being modulated into the intermittent electric power that can control output frequency and periodic width, export to again and carry out light source with LED (light-emitting diode) light emitting module 61 of intermittently modulating circuit 51 numbers such as grade in described the 6th interval 60 and start running; 70 environmental parameter detector 71 is in order to the temperature coefficient of the repaying LED light emitting module 61 constant current voltage stabilizing control circuit 31 to described the 3rd interval 30 between described SECTOR-SEVEN, to adjust and to judge the output voltage current curve of described system, though group is established and is failed to promote energy efficiency with multichannel shunting output like this, can reach the efficient that the active electric minor dispels the heat to guarantee the use of LED light fixture.
See also and Figure 4 shows that the third embodiment of the present invention, be characterized in that the described LED power drives of first embodiment of the invention system saves the 5th interval 50 and modulates circuit 51 a plurality of intermittence, after forming best power by constant current voltage stabilizing control circuit 31 rectifying and wave-filterings in described the 3rd interval 30, directly a plurality of multichannel followers 41 by described the 4th interval 40 export described the 6th interval 60 to the shunting of multichannel equal proportion usefulness, directly supply LED (light-emitting diode) light emitting module 61 to carry out light source and start running.70 environmental parameter detector 71 is in order to the temperature coefficient of the repaying LED light emitting module 61 constant current voltage stabilizing control circuit 31 to described the 3rd interval 30 between described SECTOR-SEVEN, to adjust and to judge the output voltage current curve of described system, though group is established the mode of failing to integrate shunting, intermittently modulate and is exported to promote energy efficiency like this, can reach the efficient that the active electric minor dispels the heat to guarantee the use of LED light fixture.
See also and Figure 5 shows that the 4th kind of embodiment of the present invention, be characterized in that the described LED power drives of first embodiment of the invention system saves the 4th interval the 40 and the 5th interval 50, after forming best power by constant current voltage stabilizing control circuit 31 rectifying and wave-filterings in described the 3rd interval 30, directly export described the 6th interval 60 to, directly supply LED (light-emitting diode) light emitting module 61 to carry out light source and start running.70 environmental parameter detector 71 is in order to the temperature coefficient of the repaying LED light emitting module 61 constant current voltage stabilizing control circuit 31 to described the 3rd interval 30 between described SECTOR-SEVEN, adjust and judge described system output voltage current curve, though group is established and failed to promote energy efficiency like this, can reach the efficient that the active electric minor dispels the heat to guarantee the use of LED light fixture.
See also and Figure 6 shows that the 5th kind of embodiment of the present invention, be characterized in that the described LED power drives of first embodiment of the invention system saves between SECTOR-SEVEN 70 environmental parameter detector 71, source current imports by described first interval 10, earlier carry out rectification by EMC circuit (electromagnetic compatibility circuit) 11, filtering, and judge the electric current that whether has the usefulness deficiency by SW (controlling selector automatically) 12, the electric current of usefulness deficiency is imported PWM circuit (pulse-width modulator) 13, transformer 21 by described second interval 20 behind the adjustment bring to power carries out the transformation processing, after forming best power by constant current voltage stabilizing control circuit 31 rectifying and wave-filterings in described the 3rd interval 30 again, and shunted with multichannel equal proportion usefulness by a plurality of multichannel followers 41 in described the 4th interval 40, by in described the 5th interval 50 with modulate circuit 51 intermittence of multichannel follower 41 numbers such as grade with the output of the power supply of former direct current, after being modulated into the intermittent electric power that to control output frequency and periodic width, exporting to again in described the 6th interval 60 and carry out light source startup running with LED (light-emitting diode) light emitting module 61 of modulating circuit 51 numbers such as grade described intermittence.
More than explanation is just illustrative for the purpose of the present invention, and nonrestrictive, those of ordinary skills understand; under the situation that does not break away from the spirit and scope that following claims limit, can make many modifications, change; or equivalence, but all will fall within the scope of protection of the present invention.
Claims (2)
1. an active multichannel LED power drives system is at the operation system of the designed driving power of high-power led light source equipment, it is characterized in that described system comprises:
First interval, it comprises an EMC circuit, one and is connected to first rectifying circuit of described EMC circuit, first filter circuit that is connected to described first rectifying circuit, an automatic control selector that is connected to described first filter circuit, and a PWM circuit that is connected to described automatic control selector;
Second interval, it is connected to described first interval, and comprises a transformer, to change voltage;
The 3rd interval, it is connected to described second interval, and second rectifying circuit, one that comprise a further rectification of confession are connected to described second rectifying circuit for further second filter circuit of filtering, and one be connected to described second filter circuit to form the constant current voltage stabilizing circuit of best power, and described constant current voltage stabilizing circuit is exported first voltage;
The 4th interval, it is connected to described the 3rd interval, and comprises plural multichannel follower, becomes second voltage of identical size for output in order to will come from the first voltage five equilibrium that will come from the 3rd interval;
The 5th interval, it is connected to described the 4th interval, and comprise and modulate circuit the intermittence of numbers such as described plural multichannel follower, described plural number is intermittently modulated circuit and is alternatively accepted described second voltage from described plural multichannel follower each other and integrate and become described first voltage, and moment is intermittently alternatively exported described first voltage each other again;
The 6th interval, it is connected to described the 5th interval, and comprises the LED light emitting module of intermittently modulating numbers such as circuit with described plural number, in order to accept described first voltage; And
Between SECTOR-SEVEN, it is connected to described the 3rd interval, and comprises an environmental parameter perceptron, supplies to detect the environmental parameter of LED light emitting module, thereby adjusts the output of described constant current voltage stabilizing circuit;
Power supply through described second interval, enters described the 3rd interval after being imported by described first interval again, imports described the 5th interval via the described the 4th interval back again, exports described the 6th interval immediately.
2. active multichannel LED power drives system is characterized in that described system comprises:
First interval, it comprises an EMC circuit, one and is connected to first rectifying circuit of described EMC circuit, first filter circuit that is connected to described first rectifying circuit, an automatic control selector that is connected to described first filter circuit, and a PWM circuit that is connected to described automatic control selector;
Second interval, it is connected to described first interval, and comprises a transformer, to change voltage;
The 3rd interval, it is connected to described second interval, and second rectifying circuit, one that comprise a further rectification of confession are connected to described second rectifying circuit for further second filter circuit of filtering, and one be connected to described second filter circuit to form the constant current voltage stabilizing circuit of best power, and described constant current voltage stabilizing circuit is exported first voltage;
The 5th interval, it is connected to described the 3rd interval, and comprise two or modulate circuit more intermittence, intermittently modulate circuit alternatively accepts described first voltage from described constant current voltage stabilizing circuit to described plural number each other, and moment is intermittently alternatively exported described first voltage each other again;
The 6th interval, it is connected to described the 5th interval, and comprises the LED light emitting module of intermittently modulating numbers such as circuit with described plural number, in order to accept described first voltage; And
Between SECTOR-SEVEN, it is connected to described the 3rd interval, and comprises an environmental parameter perceptron, supplies to detect the environmental parameter of LED light emitting module, thereby adjusts the output of described constant current voltage stabilizing circuit;
Power supply enters described the 3rd interval again by described first interval the importing by described second interval, imports described the 5th interval again, exports described the 6th interval immediately to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810129944 CN101636019B (en) | 2008-07-24 | 2008-07-24 | Active multi-channel LED driving power source system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810129944 CN101636019B (en) | 2008-07-24 | 2008-07-24 | Active multi-channel LED driving power source system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101636019A CN101636019A (en) | 2010-01-27 |
| CN101636019B true CN101636019B (en) | 2013-07-03 |
Family
ID=41595013
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200810129944 Active CN101636019B (en) | 2008-07-24 | 2008-07-24 | Active multi-channel LED driving power source system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101636019B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102665327B (en) * | 2012-04-13 | 2014-08-06 | 江苏理工学院 | Light-emitting diode power supply for illumination without transformer |
| JP6249685B2 (en) * | 2013-08-29 | 2017-12-20 | 矢崎総業株式会社 | Lighting device |
| TWI662391B (en) | 2017-05-08 | 2019-06-11 | 群光電能科技股份有限公司 | Power supplying device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1975534A (en) * | 2005-10-26 | 2007-06-06 | 三星电子株式会社 | Apparatus for driving of back light, back light assembly and liquid crystal display device and method of the driving |
| CN101017646A (en) * | 2006-02-09 | 2007-08-15 | 三星电机株式会社 | Drive device of color LED backlight |
| CN101170858A (en) * | 2006-10-26 | 2008-04-30 | 三星电子株式会社 | Circuit and method for driving light source |
| CN101175355A (en) * | 2007-11-29 | 2008-05-07 | 上海龙鲁自动化科技有限公司 | Intelligent high-power LED controller |
-
2008
- 2008-07-24 CN CN 200810129944 patent/CN101636019B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1975534A (en) * | 2005-10-26 | 2007-06-06 | 三星电子株式会社 | Apparatus for driving of back light, back light assembly and liquid crystal display device and method of the driving |
| CN101017646A (en) * | 2006-02-09 | 2007-08-15 | 三星电机株式会社 | Drive device of color LED backlight |
| CN101170858A (en) * | 2006-10-26 | 2008-04-30 | 三星电子株式会社 | Circuit and method for driving light source |
| CN101175355A (en) * | 2007-11-29 | 2008-05-07 | 上海龙鲁自动化科技有限公司 | Intelligent high-power LED controller |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101636019A (en) | 2010-01-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102386976B (en) | Illuminating light communication device | |
| CN101916548B (en) | Control circuit of light-emitting diode (LED) lamp tube of liquid crystal display | |
| CN103249220B (en) | Semiconductor light emitting element drive device and lighting fixture with the same | |
| CN102202450B (en) | Light-adjustable high-power LED driving power supply | |
| CN102458014A (en) | Light source control method, device and system | |
| CN203827566U (en) | Light-and-color-adjustable LED lamp | |
| EP2822362A1 (en) | Led drive device and control method therefor | |
| CN104505030B (en) | A kind of backlight drive circuit and its driving method and liquid crystal display device | |
| CN103929852A (en) | LED lamp with light and color capable of being adjusted | |
| CN102065600A (en) | LED dimming driving system | |
| CN102238768A (en) | Light-emitting diode (LED) backlight source driving module | |
| JP6072697B2 (en) | Driving device and driving method for driving a load, particularly an LED unit | |
| US8258716B2 (en) | Driving power supply system of an active type LED with multiple channels | |
| CN101636019B (en) | Active multi-channel LED driving power source system | |
| CN107426879B (en) | Voltage dimming LED control system based on PWM | |
| CN105282922B (en) | Light emitting element driving circuit and control circuit therein and control method | |
| CN201860494U (en) | Light-emitting diode driving circuit with light modulating sequential control | |
| CN209748853U (en) | LED lamp control circuit, lamp and lighting system | |
| CN202268152U (en) | Backlight constant-current and constant-voltage driving circuit for display screen | |
| CN203039964U (en) | LED switching power supply and its multi-mode dimming circuit | |
| CN201967185U (en) | Light source control device and system | |
| CN202425146U (en) | Drive circuit of LED (Light-Emitting Diode) lighting device | |
| CN110769173B (en) | Television power supply system and television | |
| CN211831274U (en) | Multichannel light modulation lamp and multichannel lighting equipment | |
| CN107113930B (en) | The ripple in the light bulb based on light emitting diode (LED) is reduced by increasing the ripple in energy storage capacitor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |