CN101994932A - Light-emitting diode device and driving method thereof - Google Patents
Light-emitting diode device and driving method thereof Download PDFInfo
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- CN101994932A CN101994932A CN2009101897422A CN200910189742A CN101994932A CN 101994932 A CN101994932 A CN 101994932A CN 2009101897422 A CN2009101897422 A CN 2009101897422A CN 200910189742 A CN200910189742 A CN 200910189742A CN 101994932 A CN101994932 A CN 101994932A
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Abstract
The invention discloses a light-emitting diode device and a driving method thereof. The device comprises a plurality of groups of light-emitting diodes, a power supply module, a driving circuit, a plurality of switches and a voltage detection circuit; the method comprises the steps of: setting at least one diode to partition a plurality of serially connected light-emitting diodes into a plurality of groups of light-emitting diodes; setting at least one group of switches corresponding to the groups of light-emitting diodes; and opening or closing the switches in a manner of voltage detection so that the serial/shunt connection manners of the groups of light-emitting diodes are changed. Therefore, the device changes the manner of driving voltage by detecting break-over voltage, thereby reaching the highest light emitting efficiency.
Description
[technical field under the invention]
The present invention system means a kind of light-emitting diode assembly and driving method thereof that conducting voltage changes load voltage of detecting especially about a kind of light-emitting diode assembly and driving method thereof.
[prior art]
From the application of illumination market face light emitting diode,, therefore there are more and more lighting devices to replace traditional lighting source by light emitting diode because of it has that volume is little, power saving, luminous driving reach advantages such as luminescent lifetime is long fast.
In general, light emitting diode operates under forward voltage, its two ends are crossed with a critical voltage value, when the voltage that is applied when a power supply surpasses this critical voltage value (generally being referred to as driving voltage), this light emitting diode just can be stimulated and externally send visible light, the brightness of this visible light is proportional to the electric current of this light emitting diode of flowing through, along with electric current increases, the brightness of light emitting diode is just bright more, yet, often be electric current to be fixed or is limited within the specific numerical value under the application of reality, except that can keeping consistent and stable luminosity, also can prolonging the service life of this light emitting diode.
Please refer to shown in Figure 1, along with popularizing that light emitting diode is used, various LED driving circuits or chip also arise at the historic moment thereupon, as No. 220047 patents of TaiWan, China invention bulletin I, promptly disclose a LED driving circuit (1), this LED driving circuit (1) is to see through the light emitting diode that the voltage of detecting and getting drives respective amount, to improve power utilization efficient and power factor, and the minimizing power consumption, this LED driving circuit (1) is by a power module (10), a plurality of current control units (11), one voltage detection circuit (12) and one has the light emitting diode array (13) of a plurality of light emitting diodes (131) and forms.
Yet, the technical disadvantages of this invention is when power supply (10) supply voltage is the situation of low-voltage, this drive circuit (1) only can drive part light emitting diode (131), and those not driven light emitting diodes (131) are in idle state, are a kind of waste for the service efficiency of single unit system.
Therefore, how can drive all light emitting diodes fully under any voltage, increase the operating efficiency of light emitting diode, be the target that relevant lighting apparatus manufacturer makes great efforts research and development always.
[summary of the invention]
This case inventor in the hope of addressing this problem or provide more kindhearted solution, through constantly making great efforts and test, develops the present invention because the problem of existing light-emitting diode assembly and driving method existence thereof is to set about researching and developing finally.
The present invention's main purpose is to provide a kind of light-emitting diode assembly and driving method thereof, mean a kind of light-emitting diode assembly and driving method thereof that utilizes the detecting conducting voltage to change driving voltage especially, compared to known light-emitting diode assembly, the present invention can drive light emitting diode fully, reaches the highest luminous efficiency.
For reaching above-mentioned purpose, the present invention's light-emitting diode assembly is to include:
Plural number light emitting diode group, each light emitting diode group system is formed by a plurality of light emitting diode series connection, is provided with the diode of a correspondence between each light emitting diode group, and wherein, this diode has a negative electrode (cathode) and an anode (anode);
One power module is to include an AC power and a rectification circuit, and this rectification circuit system is connected in this AC power, and with the negative voltage transposition of this alternating current, with as the required power source of this light-emitting diode assembly;
One drive circuit is to be connected in this power module, is used to provide the required drive current of this lumination of light emitting diode;
At least one group of switch, system is connected to this drive circuit, this light emitting diode group and one is arranged at the ground connection of this light-emitting diode assembly, each is organized and more includes one first switch and a second switch when switch correspondence is connected in the diode of this light emitting diode group, one of this first switch end system is connected in this drive circuit, the other end then is connected to the negative electrode of this diode of correspondence, one of this second switch end system is connected in the anode of this diode, the other end then is connected in this ground connection, wherein, the quantity system of this at least one group of switch is corresponding to the quantity of diode between this plural number light emitting diode group; And
One voltage detection circuit, system includes a voltage input end, at least one reference voltage input terminal and a plurality of output at least, this voltage input end system is connected in this power module, this reference voltage input terminal input has a reference voltage, each output system exports unlatching or the closed condition that a control signal is controlled this switch according to the voltage that this comparative voltage and this power module are provided, wherein, the quantity system of this output is corresponding to the quantity of this switch.
The present invention's LED driving method, it includes the following step:
At least one diode is set: this diode system is separated into a plurality of light emitting diodes that connect with series system the light emitting diode group of plural groups;
At least one group of switch is set: this open relation is connected in this diode;
Utilize the corresponding unlatching of mode of detecting voltage or close this switch, so that this light emitting diode group changes the connected mode of its series/parallel.
Therefore, by above-mentioned device and method, the present invention can be according to the difference of supply conducting voltage, utilize switch to switch to change the mode of light emitting diode group series/parallel, guaranteeing that this light emitting diode group can possess and supply voltage close driving voltage under the change of supply voltage, so can reach the highest luminous efficiency.
[embodiment]
Be familiar with the purpose that this skill personage understands the present invention for making, cooperate graphic preferred embodiment to be described in detail as follows now the present invention.
Please refer to shown in Figure 2ly, the present invention's light-emitting diode assembly (2) is to include:
Plural number light emitting diode group (20), each light emitting diode group (20) is to be in series by a plurality of light emitting diodes (201), and be provided with the diode (202) of a correspondence between each light emitting diode group (20), wherein, this diode (202) has a negative electrode (cathode) and an anode (anode);
One power module (21), system includes an AC power (210) and a rectification circuit (211), this rectification circuit (211) is to be connected in this AC power (210), and with the negative voltage transposition of this AC power (210), with as the required power source of this light-emitting diode assembly (2);
One drive circuit (22), system is connected in this power module (21), be used to provide the luminous required drive current of this light emitting diode (201), in general, for the brightness of keeping each light emitting diode (201) is able to unanimity, this drive circuit (22) is the circuit framework of a certain electric current or a threshold currents usually;
At least one group of switch, be that correspondence is connected in this drive circuit (22) respectively, this light emitting diode group (20) and one is arranged at the ground connection of this light-emitting diode assembly (2), each is organized switch and has one first switch (221) and a second switch (222) corresponding to this diode (202), one of this first switch (221) end system is connected in this drive circuit (22), the other end then is connected to the negative electrode of this diode (202) of correspondence, one of this second switch (222) end system is connected in the anode of this diode (202), the other end then is connected in this ground connection (GND), wherein, the quantity system of this at least one group of switch is corresponding to the quantity of this diode (202);
One voltage detection circuit (23), system includes a voltage input end (231), at least one reference voltage input terminal (232) and a plurality of output (233) at least, this voltage input end (231) is to be connected in this power module (21), this reference voltage input terminal (232) has a fixing reference voltage (Vref), and each output (233) is that the voltage that provided according to this reference voltage and this power module (21) is exported a control signal and come correspondingly to control the unlatching of this switch or close.
The circuit structure of above-mentioned switch, system is by the on-off circuit that semiconductor subassembly is formed of a mechanical type or at least one transistor, having common skill personage as the relevant industry of the present invention knows, control signal that this voltage detection circuit sent system is as a critical voltage (promptly inputing to the gate of this transistor or the voltage or the electric current of base stage) that makes this transistor turns, sees through the action that the state of transistorized conducting/not conducting reaches switch open or closes.
Above-mentioned reference voltage, system provides to the voltage range of this light emitting diode group according to the driving voltage of each light emitting diode group and this power module and sets, wherein, this reference voltage can see through the mode that an external voltage source produces or see through electric resistance partial pressure and obtains.
Please refer to shown in Figure 3ly, is one of light-emitting diode assembly of the present invention (3) embodiment, and it includes:
Four groups of light emitting diode groups (30), system is that 3 volts light emitting diode series connection forms by ten conducting voltage respectively, between each light emitting diode group (30) respectively correspondence be provided with one first diode (301) and one second diode (302) and one the 3rd diode (303), wherein, this first diode (301) and one second diode (302) and one the 3rd diode (303) have a negative electrode (cathode) and an anode (anode) respectively;
One power module (31), system includes an AC power (310) and a rectification circuit (311), this rectification circuit system is connected in this AC power, and with the negative voltage transposition of this AC power (310), with as the required power source of this light-emitting diode assembly, wherein, the voltage range of this power module (31) is 0～150 volt;
One drive circuit (32), system is connected in this power module (31), be used to provide the luminous required drive current of this light emitting diode group (30), wherein, this drive circuit (32) forms one 10 volts pressure drop for this light-emitting diode assembly (3), in other words, this power module (31) can provide to the voltage range of this light emitting diode group (30) be 0～140 volt;
Three groups of switches are that correspondence is connected in this drive circuit (32) respectively, this light emitting diode group (30) and one is arranged at the ground connection of this light-emitting diode assembly (3), include:
One first switches set, system includes one first switch (SW1A) and a second switch (SW1B), one of first switch (SW1A) of this first switches set end system is connected in this drive circuit (32), the other end then is connected to the negative electrode of this first diode (301), one of this second switch (SW1B) end system is connected in the anode of this first diode (301), and the other end then is connected in this ground connection; And
One second switch group, system includes one first switch (SW2A) and a second switch (SW2B), one of first switch (SW2A) of this second switch group end system is connected in this drive circuit (32), the other end then is connected to the negative electrode of this second diode (302), one of this second switch (SW2B) end system is connected in the anode of this second diode (302), and the other end then is connected in this ground connection; And
One the 3rd switches set, system includes one first switch (SW3A) and a second switch (SW3B), one of first switch (SW3A) of this second switch group end system is connected in this drive circuit (32), the other end then is connected to the negative electrode of the 3rd diode (303), one of this second switch (SW3B) end system is connected in the anode of the 3rd diode (303), and the other end then is connected in this ground connection;
One voltage detection circuit (33) is to include at least:
One voltage input end (331) is to be connected in this power module (31);
Three reference voltage input terminals (332), each reference voltage input terminal (332) are imported the reference voltage that one 30 volts, 60 volts and 120 volts are arranged respectively; And
To be that the voltage output one control voltage that provided according to this reference voltage and this power module (31) is corresponding control the unlatching of these switches or close for six outputs (333), each output (333).
Please refer to Fig. 3 and shown in Figure 4, when this power module (31) provide when the voltage range of this light emitting diode group (30) is 30～60 volts, the output (333) of this voltage detection circuit (33) can be exported the control signal of a correspondence respectively whole switches cuts out (conducting), so that these four groups of light emitting diode groups (30) connect in parallel, its minimum conducting voltage is 30 volts.
Please refer to Fig. 3 and shown in Figure 5, when this power module (31) provide when the voltage range of this light emitting diode group (30) is 60～120 volts, these outputs (333) can be exported the first switch (SW1A of the control signal of a correspondence with this first switches set and the 3rd switches set respectively, SW3A) and second switch (SW1B, SW3B) open (opening circuit), and keep first switch (SW2A) and the second switch (SW2B) of second switch group to close (conducting), so that row was in parallel again after wherein two groups of light emitting diode groups (30) connected in the mode of connecting, its minimum conducting voltage is 60 volts.
Please refer to Fig. 3 and shown in Figure 6, when this power module (31) provide when the voltage range of this light emitting diode group (30) is 120～140 volts, these outputs (333) can be exported the control voltage of a correspondence respectively respectively with whole switch opens (opening circuit), so that these four groups of light emitting diode groups (30) connect in the mode of connecting, its minimum conducting voltage is 120 volts.
Therefore, by above-mentioned structure, the present invention's light-emitting diode assembly, system is according to the difference of voltage that power module is supplied, utilize switch to switch to change the mode of light emitting diode group series/parallel, guarantee that all light emitting diode groups can still possess and supply voltage close driving voltage under the change of supply voltage, so can reach the highest luminous efficiency.
The present invention's LED driving method, it includes:
The light emitting diode group that at least one diode is separated into a plurality of light emitting diodes that connect with series system plural groups is set;
At least one group of switch corresponding to this diode is set;
Utilize the corresponding unlatching of mode of detecting voltage or close this switch, so that these light emitting diode groups must change the connected mode of its series/parallel.
Therefore, see through above-mentioned method, the present invention's LED driving method, the conversion that can see through connected mode changes the driving voltage of light emitting diode, can still possess under the change of supply voltage and the close driving voltage of supply voltage to guarantee all light emitting diode groups.
Yet only above-mentioned person only is the preferred embodiment of patent application case of the present invention, when the scope that can not limit patent application case enforcement of the present invention.Be that all equalizations of doing according to patent application case application range of the present invention change and modify etc., all should belong to the patent covering scope of patent application case of the present invention.
[brief description of drawingsfig]
Fig. 1 is the circuit framework figure of a known LED driving circuit.
Fig. 2 is the circuit framework figure of the present invention's light-emitting diode assembly.
Fig. 3 is the circuit framework figure of one of the present invention embodiment.
Fig. 4 is the equivalent circuit diagram of this four groups of light emitting diode groups parallel connection among the 3rd figure.
Fig. 5 is a corresponding again equivalent circuit diagram in parallel after these two groups of light emitting diode groups connect in the mode of connecting among Fig. 3.
The 6th figure is the equivalent circuit diagram of these four groups of light emitting diode group series connection among Fig. 3.
[primary clustering symbol description]
(1) drive circuit (10) power module
(11) current control unit (12) voltage detection circuit
(13) light emitting diode array (131) light emitting diode
(2) light-emitting diode assembly (20) light emitting diode group
(201) light emitting diode (202) diode
(21) power module (210) AC power
(211) rectification circuit (22) drive circuit
(221) first switch (222) second switches
(23) voltage detection circuit (231) voltage input end
(232) reference voltage input terminal (233) output
(3) light-emitting diode assembly (30) light emitting diode group
(301) first diodes (302) second diodes
(303) the 3rd diode (31) power modules
(310) AC power (311) rectification circuit
(32) drive circuit (33) voltage detection circuit
(331) voltage input end (332) reference voltage input terminal
(333) (SW2A) (SW3A) first switch of output (SW1A)
(SW1B) (SW2B) (SW3B) second switch
Claims (8)
1. light-emitting diode assembly is characterized in that this light-emitting diode assembly includes:
Plural number light emitting diode group is to be formed by a plurality of light emitting diode series connection, is provided with the diode of a correspondence between each light emitting diode group, and wherein, this diode has a negative electrode and an anode;
One power module is the power source as this light-emitting diode assembly;
One drive circuit is to be connected in this power module;
At least one group of switch is that correspondence is connected in this drive circuit respectively, this light emitting diode group and one is arranged at the ground connection of this light-emitting diode assembly; And
One voltage detection circuit, system includes a voltage input end, at least one reference voltage input terminal and at least one output at least, this voltage input end system is connected in this power module, this reference voltage input terminal has a reference voltage, and the voltage that each output system is provided according to this reference voltage and this power module is exported a control signal and controlled this to the unlatching of inductive switch or close.
2. light-emitting diode assembly as claimed in claim 1 is characterized in that this power module system includes an AC power and a rectification circuit, and this rectification circuit system is connected in this AC power, and with the negative voltage transposition of this alternating current.
3. light-emitting diode assembly as claimed in claim 1 or 2, it is characterized in that respectively organizing switch and have one first switch and a second switch corresponding to this diode, one of this first switch end system is connected in this drive circuit, the other end then is connected to the negative electrode of this diode of correspondence, one of this second switch end system is connected in the anode of this diode, and the other end is ground connection then.
4. light-emitting diode assembly as claimed in claim 1 is characterized in that this drive circuit is the circuit framework of a certain electric current or a threshold currents.
5. light-emitting diode assembly as claimed in claim 1 is characterized in that the quantity of the quantity system of this at least one group of switch corresponding to this diode.
6. light-emitting diode assembly as claimed in claim 1 is characterized in that these open relation one mechanical switches.
7. light-emitting diode assembly as claimed in claim 1 is characterized in that the on-off circuit that these open relations are made up of at least one semiconductor subassembly.
8. LED driving method is characterized in that this LED driving method includes the following step:
At least one diode is set: this diode system is separated into a plurality of light emitting diodes that connect with series system the light emitting diode group of plural groups;
At least one group of switch is set: this open relation is connected in this diode; And
Utilize the corresponding unlatching of mode of detecting voltage or close this switch, so that these light emitting diode groups must change the connected mode of its series/parallel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101897422A CN101994932B (en) | 2009-08-26 | 2009-08-26 | Light-emitting diode device and driving method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101897422A CN101994932B (en) | 2009-08-26 | 2009-08-26 | Light-emitting diode device and driving method thereof |
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| Publication Number | Publication Date |
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| CN101994932A true CN101994932A (en) | 2011-03-30 |
| CN101994932B CN101994932B (en) | 2013-06-12 |
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| CN2009101897422A Active CN101994932B (en) | 2009-08-26 | 2009-08-26 | Light-emitting diode device and driving method thereof |
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| CN102781138A (en) * | 2011-05-13 | 2012-11-14 | 陈瑞贞 | Light emitting diode device |
| CN102781146A (en) * | 2012-06-13 | 2012-11-14 | 友达光电股份有限公司 | driving circuit of light emitting diode string and driving method thereof |
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| CN103249201A (en) * | 2012-02-06 | 2013-08-14 | 光宝电子(广州)有限公司 | Light emitting diode circuit and light emitting device thereof |
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| CN105704878A (en) * | 2014-12-10 | 2016-06-22 | 隆达电子股份有限公司 | Light emitting device and light emitting diode circuit |
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| CN102781138A (en) * | 2011-05-13 | 2012-11-14 | 陈瑞贞 | Light emitting diode device |
| CN102821507A (en) * | 2011-06-08 | 2012-12-12 | 东莞柏泽光电科技有限公司 | Lighting device and method thereof |
| US9510413B2 (en) | 2011-07-28 | 2016-11-29 | Cree, Inc. | Solid state lighting apparatus and methods of forming |
| US9398654B2 (en) | 2011-07-28 | 2016-07-19 | Cree, Inc. | Solid state lighting apparatus and methods using integrated driver circuitry |
| US9277605B2 (en) | 2011-09-16 | 2016-03-01 | Cree, Inc. | Solid-state lighting apparatus and methods using current diversion controlled by lighting device bias states |
| CN103890680A (en) * | 2011-09-16 | 2014-06-25 | 克里公司 | Solid-state lighting apparatus and methods using current diversion controlled by lighting device bias states |
| US9041302B2 (en) | 2011-09-16 | 2015-05-26 | Cree, Inc. | Solid-state lighting apparatus and methods using energy storage |
| US9131561B2 (en) | 2011-09-16 | 2015-09-08 | Cree, Inc. | Solid-state lighting apparatus and methods using energy storage |
| CN103890680B (en) * | 2011-09-16 | 2016-01-13 | 克里公司 | The solid-state lighting device of the electric current conversion using illuminating device bias state to control and method |
| CN103002629A (en) * | 2011-09-19 | 2013-03-27 | 东莞柏泽光电科技有限公司 | Illuminating apparatus with power detection function and method for illuminating apparatus |
| CN103037563A (en) * | 2011-09-28 | 2013-04-10 | 东莞柏泽光电科技有限公司 | Lighting device and lighting method capable of reducing stroboflash |
| CN103249201A (en) * | 2012-02-06 | 2013-08-14 | 光宝电子(广州)有限公司 | Light emitting diode circuit and light emitting device thereof |
| CN102781146B (en) * | 2012-06-13 | 2014-08-27 | 友达光电股份有限公司 | driving circuit of light emitting diode string and driving method thereof |
| CN102781146A (en) * | 2012-06-13 | 2012-11-14 | 友达光电股份有限公司 | driving circuit of light emitting diode string and driving method thereof |
| CN104918351A (en) * | 2014-03-14 | 2015-09-16 | 陈权霈 | Light emitting diode lamp string driving circuit |
| CN105704878A (en) * | 2014-12-10 | 2016-06-22 | 隆达电子股份有限公司 | Light emitting device and light emitting diode circuit |
| WO2021248585A1 (en) * | 2020-06-11 | 2021-12-16 | 武汉华星光电技术有限公司 | Driving circuit, backlight module, and display device |
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