CN102781138A - Light emitting diode device - Google Patents
Light emitting diode device Download PDFInfo
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- CN102781138A CN102781138A CN201210137196XA CN201210137196A CN102781138A CN 102781138 A CN102781138 A CN 102781138A CN 201210137196X A CN201210137196X A CN 201210137196XA CN 201210137196 A CN201210137196 A CN 201210137196A CN 102781138 A CN102781138 A CN 102781138A
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Abstract
The invention discloses a light-emitting diode device which comprises a power supply module, a light-emitting diode dynamic module and a voltage detection and control circuit. The power module is configured to generate a first voltage. The LED dynamic module comprises at least three groups of LED groups, a plurality of diodes, a first switch and a second switch. The voltage detection and control circuit changes the series-parallel connection relation among the three groups of light-emitting diode groups by controlling the conduction and the open circuit of the first switch and the second switch according to the voltage value range of the first voltage of the power module and at least one threshold voltage so as to dynamically change the driving voltage of the light-emitting diode dynamic module.
Description
Technical field
The invention relates to a kind of light-emitting diode assembly, refer to especially a kind ofly can between any section of wide scope input voltage, keep high power factor and high efficiency light-emitting diode assembly.
Background technology
In recent years because light-emitting diode (Light Emitting Diode; LED) breakthrough of manufacturing technology; Make the luminosity and the luminous efficiency of light-emitting diode significantly promote; Thereby make light-emitting diode replace existing fluorescent tube gradually and become new illumination component; For example be widely used in illumination application such as home lighting device, car headlight device, hand-held lighting device, liquid crystal panel backlight, traffic sign indicator light, indication billboard, and the brightness in order to increase light-emitting diode and to use, can a plurality of light-emitting diodes be connected in series each other and form a light-emitting diode component.
Because light-emitting diode needs DC power supply to drive; Therefore work as light-emitting diode and be applied to receive AC power; In the time of for example in the device of civil power, the one drive circuit that then need comprise a rectification circuit converts AC power into DC power supply, with the driven for emitting lights led lighting.Can not receive the influence of the characteristic changing of light-emitting diode itself again in order to make the light-emitting diode or the luminosity of light-emitting diode component maintained certain value; The operating temperature of for example being accumulated because of light-emitting diode itself or of living in outside cause at environment; Drive circuit need have output usually decide electric current and to come the driven for emitting lights diode or the mechanism of light-emitting diode component, avoid by this light-emitting diode damage, aging or the phenomenon generation of flicker is arranged ahead of time because of receiving unsteady electric current.
Be the power supply and demand of pursuing high quality,, more need improve the power utilization efficient and the power factor (PF) of electric product on the other hand except improving the electric power energize by power plant.Fig. 1 is the calcspar of existing LED driving circuit.Existing LED driving circuit 1 comprises power module 10, a plurality of conduct current control unit 11, voltage detection unit 12 and the light emitting diode string group of being made up of a plurality of light-emitting diode 13.Existing LED driving circuit 1 is to utilize voltage detection unit 12 to detect the voltage level of power supply forward part; Come to drive respectively different conduct current control units 11 according to the difference of voltage level then and make its conducting; By this to light the light-emitting diode of respective amount; With raising power utilization efficient and power factor (PF), and reduce power consumption.Yet not only circuit framework is complicated for this existing LED driving circuit 1, cost is high, and can't in wide scope input voltage, still keep FR high power factor and high efficiency.In addition; For meeting environmental protection and requirements of saving energy; Countries in the world all have related specifications rule to decide lighting apparatus must to meet more than the normal values in its power factor (PF) of the above person of 25W, and for example greater than 90%, right existing line architecture still can't meet high power factor and high efficiency requirement; Therefore be necessary to develop a kind of LED driving circuit and driving method thereof in fact, to solve and to overcome prior art problems and disappearance.
Summary of the invention
Main purpose of the present invention is to provide a kind of light-emitting diode assembly, and it is directly to utilize the dynamically output voltage of control light-emitting diode assembly, and then makes the power factor (PF) of integrated circuit improve, and significantly reduces energy loss.
Another purpose of this case is for providing a kind of light-emitting diode assembly, and it can keep high power factor and high efficiency between any section of wide scope input voltage.
For reaching above-mentioned purpose, this case provides a kind of light-emitting diode assembly, comprises power module, light-emitting diode dynamic module and voltage detecting and control circuit.Power module is that framework is in producing one first voltage.The light-emitting diode dynamic module is electrically connected with power module; And comprise one first light-emitting diode group, one second light-emitting diode group, one the 3rd light-emitting diode group, one first diode, one second diode, one the 3rd diode, one the 4th diode, one first switch and a second switch; Wherein an end of an input of this first light-emitting diode group and this first switch is connected with an end of this power module; The other end of this first switch is connected with an anode tap of this first diode; One cathode terminal of the 4th diode and an input of the 3rd light-emitting diode group connect; One output of this first light-emitting diode group is connected with a cathode terminal of an anode tap of this second diode, the 3rd diode and an end of this second switch; The other end of this second switch is connected with an output of the 3rd light-emitting diode group; One cathode terminal of this first diode and a cathode terminal of this second diode are connected with an input of this second light-emitting diode group, and an output of this second light-emitting diode group is connected with an anode tap of the 4th diode with an anode tap of the 3rd diode.Voltage detecting and control circuit are according to the range of voltage values of this first voltage of this power module and at least one threshold voltage; To change the connection in series-parallel relation between these three groups of light-emitting diode group, dynamically to change a driving voltage of this light-emitting diode dynamic module through conducting and the open circuit of controlling this first switch and this second switch.
For reaching above-mentioned purpose, this case provides a kind of light-emitting diode assembly in addition, comprises power module, light-emitting diode dynamic module and voltage detecting and control circuit.Power module is that framework is in producing one first voltage.The light-emitting diode dynamic module is electrically connected with this power module, and comprises one first light-emitting diode group, one second light-emitting diode group, one the 3rd light-emitting diode group, one the 4th light-emitting diode group, one first diode, one second diode, one the 3rd diode, one the 4th diode, one the 5th diode, one the 6th diode, one the 7th diode, one first switch, a second switch, one the 3rd switch and one the 4th switch.Wherein, One end of one input of this first light-emitting diode group, an end of this first switch and this second switch is connected with an end of this power module; The other end of this first switch is connected with an anode tap of this first diode and an anode tap of the 5th diode; One output of this first light-emitting diode group is connected with an anode tap of an anode tap of this second diode and the 3rd diode; One cathode terminal of this first diode and a cathode terminal of this second diode are connected with an input of this second light-emitting diode group; One output of this second light-emitting diode group is connected with an end of an anode tap of the 4th diode and the 3rd switch; The other end of this second switch is connected with an input of the 3rd light-emitting diode group with a cathode terminal of the 4th diode; One output of the 3rd light-emitting diode group is connected with an anode tap of the 7th diode with an anode tap of the 6th diode; One cathode terminal of the 5th diode and a cathode terminal of the 6th diode are connected with an input of the 4th light-emitting diode group; One cathode terminal of the 3rd diode and a cathode terminal of the 7th diode are connected with an end of the 4th switch, and the other end of the other end of the 3rd switch and the 4th switch and an output of the 4th light-emitting diode group are connected to the other end of this power module.Voltage detecting and control circuit are according to the range of voltage values of this first voltage of this power module and at least two threshold voltages; The connection in series-parallel relation that changes these four groups of light-emitting diode group with conducting through controlling this first switch, this second switch, the 3rd switch and the 4th switch and open circuit is dynamically to change a driving voltage of this light-emitting diode dynamic module.
For reaching above-mentioned purpose, this case provides a kind of light-emitting diode assembly in addition, comprises power module, light-emitting diode dynamic module and voltage detecting and control circuit.Power module is that framework is in producing one first voltage.The light-emitting diode dynamic module is electrically connected with this power module; And comprise at least three group light-emitting diode group, a plurality of diode and at least one group of switches set; Wherein these a plurality of diodes are connected between this three groups light-emitting diode group at least; And each this diode has an anode tap and a cathode terminal; This at least one group of switches set comprises first switch and second switch, and an end of this first switch is electrically connected on an end of this power module, and the other end of this first switch is connected in respectively this cathode terminal of at least two diodes of these a plurality of diodes; One end of this second switch is connected in the other end of this power module, and the other end of this second switch is connected in respectively this anode tap of at least two diodes of these a plurality of diodes.Voltage detecting and control circuit are according to the range of voltage values of this first voltage of this power module and at least two threshold voltages; Change the connection in series-parallel relation of this at least three groups light-emitting diode group with this first switch through controlling this at least one group of switches set and this second switch conducting and open circuit, dynamically to change a driving voltage of this light-emitting diode dynamic module.
Description of drawings
Fig. 1 is the calcspar of existing LED driving circuit;
Fig. 2 A is the circuit diagram of the light-emitting diode assembly of this case first preferred embodiment;
Fig. 2 B is the voltage and current waveform of this case first preferable light-emitting diode assembly;
Fig. 3 is the circuit diagram of the light-emitting diode assembly of this case second preferred embodiment.
Wherein, description of reference numerals is following:
Light-emitting diode assembly: 2;
Power module: 21;
Drive circuit: 22;
Voltage detecting and control circuit: 23;
Light-emitting diode dynamic module: 24,25;
Drive current: Id;
First output: 21a;
First input end: 21b;
Second output: 22a;
Second input: 22b;
AC power: 210;
Rectification circuit: 211;
First ~ the 4th light-emitting diode group: 241 ~ 243,251 ~ 254;
First ~ the 4th switch: S1 ~ S6;
First ~ the 7th diode: D1 ~ D11;
First light-emitting diode group input: the 241a;
First light-emitting diode group output: the 241b;
Second light-emitting diode group input: the 242a;
Second light-emitting diode group output: the 242b;
The 3rd light-emitting diode group input: 243a;
The 3rd light-emitting diode group output: 243b;
First light-emitting diode group input: the 251a;
First light-emitting diode group output: the 251b;
Second light-emitting diode group input: the 252a;
Second light-emitting diode group output: the 252b;
The 3rd light-emitting diode group input: 253a;
The 3rd light-emitting diode group output: 253b;
The 4th light-emitting diode group input: 254a;
The 4th light-emitting diode group output: 254b;
First voltage: Vr;
Second voltage: Vd;
Output voltage: Vo;
The very first time: t1;
Second time: t2;
The one group of magnitude of voltage that light-emitting diode group is striden: Vo1;
The three groups of magnitude of voltage that light-emitting diode group is striden: Vo2;
The sense of current: Ida ~ Ide.
Embodiment
Some exemplary embodiments that embody this pattern characteristics and advantage will be described in detail in the explanation of back segment.Be understood that this case can have various variations on different processes, the scope of its neither disengaging this case, and explanation wherein and be shown in the usefulness of being used as explanation in essence, but not in order to restriction this case.
Please refer to Fig. 2 A, it is the circuit diagram of the light-emitting diode assembly of this case first preferred embodiment.As shown in the figure; Light-emitting diode assembly 2 comprises power module 21, drive circuit 22, voltage detecting and control circuit 23 and light-emitting diode dynamic module 24; Wherein power module 21 is in order to provide light-emitting diode assembly 2 required electric power; Drive circuit 22 is connected in power module 21, in order to export one be essentially definite value drive current Id, this voltage detecting and control circuit 23 are controlled the flowing mode of doing of this light-emitting diode dynamic module 24 in order to the voltage of exporting in response to power module 21.Power module 21 has one first an output 21a and a first input end 21b; Drive circuit 22 comprises one second output 22a and one second input 22b; The second output 22a is connected with the first output 21a; The input side of the second input 22b and light-emitting diode dynamic module 24 electrically connects, and the outlet side of first input end 21b and light-emitting diode dynamic module 24 electrically connects.
This power module 21 includes an AC power 210 and a rectification circuit 211; In present embodiment; This rectification circuit 211 can be but not be limited to a bridge rectifier; Wherein rectification circuit 211 electrically connects with AC power 210, in order to the negative voltage transposition with AC power 210, with as the required power source of light-emitting diode assembly 2.
Light-emitting diode dynamic module 24 comprises first light-emitting diode group 241, second light-emitting diode group 242, the 3rd light-emitting diode group 243, first switch S 1, second switch S2 and first ~ the 4th diode D1 ~ D4, and wherein first switch S 1 is one group of switches set with second switch S2 framework.In this embodiment, each light-emitting diode group 241,242,243 comprises for example two light-emitting diodes, but not as limit.Wherein, First light-emitting diode group 241 has the first light-emitting diode group input 241a and the first light-emitting diode group output 241b; Second light-emitting diode group 242 has the second light-emitting diode group input 242a and the second light-emitting diode group output 242b, and the 3rd light-emitting diode group 243 has the 3rd light-emitting diode group input 243a and the 3rd light-emitting diode group output 243b.Connected mode between first light-emitting diode group 241, second light-emitting diode group 242, the 3rd light-emitting diode group 243, first switch S 1, second switch S2 and first ~ the 4th diode D1 ~ D4 is following.One end of the first light-emitting diode group input 241a and first switch S 1 is connected with the second input 22b, the anode tap of the other end of first switch S 1 and the first diode D1, and the cathode terminal of the 4th diode D4 and the 3rd light-emitting diode group input 243a connect.The first light-emitting diode group output 241b is connected with the anode tap of the second diode D2, the cathode terminal of the 3rd diode D3 and the end of second switch S2.The other end of second switch S2 is connected with the 3rd light-emitting diode group output 234b; The cathode terminal of the cathode terminal of the first diode D1 and the second diode D2 is connected with the second light-emitting diode group input 242a, and the second light-emitting diode group output 242b then is connected with the anode tap of the 4th diode D4 with the anode tap of the 3rd diode D3.
Please consult Fig. 2 A again, and cooperate Fig. 2 B, wherein Fig. 2 B is the voltage and current waveform of this case first preferable light-emitting diode assembly.In present embodiment; AC power 210 for example can be civil power (+110V～-110V), but not as limit, and rectification circuit 211 is to be one first voltage Vr with this commercial power rectification; Its magnitude of voltage for example can be 0V ~+110V; It is the second voltage Vd that drive circuit 22 has a pressure drop, and exports one and be essentially the drive current Id that decides electric current, and light-emitting diode dynamic module 24 has been striden an output voltage V o.When desiring driven for emitting lights diode dynamic module 24, the magnitude of voltage of the voltage that the difference that must make the first voltage Vr and the second voltage Vd is striden greater than light-emitting diode dynamic module 24, so light-emitting diode dynamic module 24 just can the quilt driving and luminous.
Because the waveform of the first voltage Vr is a string ripple, its magnitude of voltage has height to change along with the time, and is right in one-period; Make 24 conductings of light-emitting diode dynamic module soon if can heal; Then can make power factor (PF) increase, be lower than one first threshold voltage, for example 40V so can the magnitude of voltage of output voltage V o be set; Output voltage V o this moment (Vo=Vo1) is one group of magnitude of voltage Vo1 that light-emitting diode group 241 is striden; For example 20V so can make the 24 quick conductings of light-emitting diode dynamic module with the increase power factor (PF), and avoids the waste of energy.But if output voltage V o is always certain value; Then heal when high, can make that the magnitude of voltage of the second voltage Vd is also higher, so will cause the energy loss of drive circuit 22 excessive when the magnitude of voltage of the first voltage Vr; The i.e. first voltage Vr-output voltage V o=, the second voltage Vd; And the energy loss of drive circuit=second voltage Vd x drive current Id, because drive current Id is for deciding electric current in fact, so more then the energy loss of drive circuit is bigger as the second voltage Vd.Right desire solves the excessive problem of energy loss of above-mentioned drive circuit 22, and improves power factor (PF), can be achieved through the method for dynamically adjusting the magnitude of voltage of output voltage V o in response to the magnitude of voltage of the first voltage Vr.
Please consult 2A and 2B figure again; Before the very first time t1 shown in Fig. 2 B; Because the first voltage Vr does not also make output voltage V o reach the magnitude of voltage Vo1 that one group of light-emitting diode group 241 is striden; This moment, integrated circuit still was an open-circuit condition, so output voltage V o, the second voltage Vd and drive current Id are zero, first switch S 1 and second switch S2 then are controlled to be conducting state through voltage detecting and control circuit 23; So can make three groups of light-emitting diode group 241 ~ 243 be parallel connection, so output voltage V o is actually the magnitude of voltage Vo1 that each group light-emitting diode group is striden.And when the time be after the very first time t1 and the second time t2 before the time; This moment, the first voltage Vr reached the magnitude of voltage that is enough to driven for emitting lights diode dynamic module 24; The i.e. first voltage Vr-, the second voltage Vd>one group of magnitude of voltage Vo1 that light-emitting diode group 241 is striden; So this drive circuit 22 output driving current Id are with driven for emitting lights diode dynamic module 24; The output voltage V o of this moment promptly equally is one group of magnitude of voltage Vo1 that light-emitting diode group 241 is striden, and the current direction of drive current Id is the Ida direction.And after the time is the second time t2; The first voltage Vr that voltage detecting and control circuit 23 detect this moment has reached or greater than first threshold voltage; Then voltage detecting and control circuit 23 control first switch S 1 and second switch S2 open a way; So can make three groups of light-emitting diode group 241 ~ 243 be series connection, the output voltage V o of this moment is three groups of magnitude of voltage Vo2 that light-emitting diode group 241 ~ 243 is striden, and is the magnitude of voltage Vo1 (Vo2=3*Vo1) that three times of one group of light-emitting diode group 241 are striden; The current direction of drive current Id is the Idb direction; The magnitude of voltage of the magnitude of voltage Vo2 that the three groups of light-emitting diode group 241 ~ 243 of voltage Vr-of winning are striden is reduced, and promptly the magnitude of voltage of the second voltage Vd behind the second time t2 reduces, and the energy loss of drive circuit 22 is reduced.Through the method for above-mentioned dynamic control output voltage Vo, the energy loss that can improve power factor (PF) effectively and reduce integrated circuit.
See also Fig. 3, it is the circuit diagram of the light-emitting diode assembly of this case second preferred embodiment.As shown in the figure; Light-emitting diode assembly 2 comprises power module 21, drive circuit 22, voltage detecting and control circuit 23 and light-emitting diode dynamic module 25; Wherein power module 21 is in order to provide light-emitting diode assembly 2 required electric power; Drive circuit 22 is connected in power module 21, in order to export one be essentially definite value drive current Id, this voltage detecting and control circuit 23 are controlled the flowing mode of doing of this light-emitting diode dynamic module 25 in order to the voltage of exporting in response to power module 21.Power module 21 has one first an output 21a and a first input end 21b; Drive circuit 22 comprises one second output 22a and one second input 22b; The second output 22a is connected with the first output 21a; The input side of the second input 22b and light-emitting diode dynamic module 25 electrically connects, and the outlet side of first input end 21b and light-emitting diode dynamic module 25 electrically connects.
Light-emitting diode dynamic module 25 comprises first light-emitting diode group 251, second light-emitting diode group 252, the 3rd light-emitting diode group 253, the 4th light-emitting diode group 254, first ~ the 4th switch S 3 ~ S6, and first ~ the 7th diode D5 ~ D11; Wherein first switch S 3 and the 4th switch S 6 frameworks are first group of switches set, and second switch S4 and the 3rd switch S 5 frameworks are second group of switches set.In this embodiment, each light-emitting diode group comprises for example two light-emitting diodes, but not as limit.Wherein, First light-emitting diode group 251 has the first light-emitting diode group input 251a and the first light-emitting diode group output 251b; Second light-emitting diode group 252 has the second light-emitting diode group input 252a and the second light-emitting diode group output 252b; The 3rd light-emitting diode group 253 has the 3rd light-emitting diode group input 253a and the 3rd light-emitting diode group output 253b, and the 4th light-emitting diode group 254 has the 4th light-emitting diode group input 254a and the 4th light-emitting diode group output 254b.First light-emitting diode group 251, second light-emitting diode group 252, the 3rd light-emitting diode group 253, the 4th light-emitting diode group 254, first ~ the 4th switch S 3 ~ S6, and first ~ the 7th diode D5 ~ D11 between connected mode following.One end of the first light-emitting diode group input 251a, first switch S 3 and the end of second switch S4 are connected with the second input 22b; The other end of first switch S 3 is connected with the anode tap of the first diode D5 and the anode tap of the 5th diode D9; The first light-emitting diode group output 251b is connected with the anode tap of the second diode D6 and the anode tap of the 3rd diode D7; The cathode terminal of the cathode terminal of the first diode D5 and the second diode D6 is connected with the second light-emitting diode group input 252a; The second light-emitting diode group output 252b is connected with the anode tap of the 4th diode D8 and an end of the 3rd switch S 5; The other end of second switch S4 is connected with the 3rd light-emitting diode group input 253a with the cathode terminal of the 4th diode D8; The 3rd light-emitting diode group output 253b is connected with the anode tap of the 7th diode D11 with the anode tap of the 6th diode D10; The cathode terminal of the cathode terminal of the 5th diode D9 and the 6th diode D10 is connected with the 4th light-emitting diode group input 254a; The cathode terminal of the cathode terminal of the 3rd diode D7 and the 7th diode D11 is connected with an end of the 4th switch S 6, and the other end of the other end of the 3rd switch S 5 and the 4th switch S 6 and the 4th light-emitting diode group output 254b are connected to first input end 21b.
In order to make power factor (PF) increase; So can the magnitude of voltage of output voltage V o be set and be lower than one first threshold voltage; 35V for example, output voltage V o this moment (Vo=Vo1) is one group of the magnitude of voltage Vo1 that light-emitting diode group 251 is striden, for example 17.5V; So can make the 25 quick conductings of light-emitting diode dynamic module with the increase power factor (PF), and avoid the waste of energy.
Please consult Fig. 3 again; The waveform of the first voltage Vr is a string ripple, and its magnitude of voltage has height to change along with the time, so works as the first voltage Vr and is lower than one first threshold voltage (not shown); When for example not reaching 35V; This moment, voltage detecting and control circuit 23 can be controlled first ~ the 4th switch S 3 ~ S6 conducting, and this moment, four groups of light-emitting diode group 251 ~ 254 were parallel connection, so output voltage V o is the voltage that one group of light-emitting diode group is striden; And drive circuit 22 is exported a drive current Id to drive this light-emitting diode dynamic module 25, and this moment, the flow direction of drive current Id was the Idc direction.Be higher than first threshold voltage and be lower than one second threshold voltage (not shown) and work as the first voltage Vr; When for example not reaching 70V more than the 35V; Voltage detecting and control circuit 23 control, first switch S 3 and the 4th switch S 6 are open circuit simultaneously; Second switch S4 and the 3rd switch S 5 be simultaneously for conducting, this moment first light-emitting diode group 251 with second light-emitting diode group 252 for connecting, the 3rd light-emitting diode group 253 and the 4th light-emitting diode group 254 are also for connecting; And first light-emitting diode group 251 is parallelly connected with second light-emitting diode group 252, the 3rd light-emitting diode group 253 with the 4th light-emitting diode group 254; So output voltage V o is two groups of voltages that the light-emitting diode group series connection is striden, promptly second threshold voltage is twice first threshold voltage, and this moment, the flow direction of drive current Id was the Idd direction.As the first voltage Vr during greater than second threshold voltage; 70V for example; Voltage detecting and control circuit 23 controls first ~ the 4th switch S 3 ~ S6 are open circuit, and this moment, the flow direction of drive current Id was the Ide direction, so output voltage V o is four groups of voltages that the light-emitting diode group series connection is striden.
In the foregoing description, first threshold voltage and second threshold voltage are the values of setting arbitrarily according to the proportion of required power factor and efficient, and wherein, the magnitude of voltage size is the crest voltage of first threshold voltage, second threshold voltage and the first voltage Vr in regular turn.
Whether the conducting of controlling light-emitting diode dynamic module 25 internal switches in response to voltage range and a plurality of threshold voltage of the first voltage Vr through voltage detecting and control circuit 23; Can change the connection in series-parallel relation of a plurality of light-emitting diode group of light-emitting diode dynamic module 25; With driving voltage or the output voltage V o that dynamically controls light-emitting diode dynamic module 25, the energy loss that can improve power factor (PF) by this effectively and reduce integrated circuit.
In sum, this case provides a kind of light-emitting diode assembly, and it directly utilizes the dynamically output voltage of control light-emitting diode assembly, and then makes the power factor (PF) of integrated circuit improve, and significantly reduces energy loss.In addition, light-emitting diode assembly of this case and driving method thereof also can be kept high power factor and high efficiency between any section of wide scope input voltage.
This case must be appointed by those skilled in the art and executed that the craftsman thinks and be to modify as all, right neither take off such as attach application right claimed range desire Protector.
Claims (14)
1. light-emitting diode assembly comprises:
One power module, its framework is in producing one first voltage;
One light-emitting diode dynamic module; Be electrically connected with this power module; And comprise one first light-emitting diode group, one second light-emitting diode group, one the 3rd light-emitting diode group, one first diode, one second diode, one the 3rd diode, one the 4th diode, one first switch and a second switch; Wherein an end of an input of this first light-emitting diode group and this first switch is connected with an end of this power module; The other end of this first switch is connected with an anode tap of this first diode; One cathode terminal of the 4th diode and an input of the 3rd light-emitting diode group connect; One output of this first light-emitting diode group is connected with a cathode terminal of an anode tap of this second diode, the 3rd diode and an end of this second switch; The other end of this second switch is connected with an output of the 3rd light-emitting diode group, and a cathode terminal of this first diode and a cathode terminal of this second diode are connected with an input of this second light-emitting diode group, and an output of this second light-emitting diode group is connected with an anode tap of the 4th diode with an anode tap of the 3rd diode; And
One voltage detecting and control circuit; It is according to the range of voltage values and a threshold voltage of this first voltage of this power module; To change the connection in series-parallel relation between these three groups of light-emitting diode group, dynamically to change a driving voltage of this light-emitting diode dynamic module through conducting and the open circuit of controlling this first switch and this second switch.
2. light-emitting diode assembly as claimed in claim 1, wherein this power module comprises an AC power and a rectification circuit, this rectification circuit is connected in this AC power, and with the negative voltage transposition of this AC power.
3. light-emitting diode assembly as claimed in claim 1; It also comprises one drive circuit; Be electrically connected on this power module and this light-emitting diode dynamic module, in order to receive this first voltage and output certain value drive current to drive this light-emitting diode dynamic module.
4. light-emitting diode assembly as claimed in claim 3; Wherein when this first voltage of this power module is lower than this threshold voltage; This voltage detecting and control circuit this first switch of control and this second switch are conducting, and this first, second and third group of light-emitting diode group is parallel connection.
5. light-emitting diode assembly as claimed in claim 4, wherein when this first voltage during greater than this threshold voltage, this voltage detecting and control circuit this first switch of control and this second switch open circuit, this first, second and third group of light-emitting diode group is series connection.
6. light-emitting diode assembly as claimed in claim 5, wherein this threshold voltage can be total driving voltage of this light-emitting diode group respectively or the value of setting arbitrarily according to the proportion of required power factor and efficient.
7. light-emitting diode assembly comprises:
One power module, its framework is in producing one first voltage;
One light-emitting diode dynamic module; Be electrically connected with this power module; And comprise one first light-emitting diode group, one second light-emitting diode group, one the 3rd light-emitting diode group, one the 4th light-emitting diode group, one first diode, one second diode, one the 3rd diode, one the 4th diode, one the 5th diode, one the 6th diode, one the 7th diode, one first switch, a second switch, one the 3rd switch and one the 4th switch; Wherein an end of an end of an input of this first light-emitting diode group, this first switch and this second switch is connected with an end of this power module; The other end of this first switch is connected with an anode tap of this first diode and an anode tap of the 5th diode; One output of this first light-emitting diode group is connected with an anode tap of an anode tap of this second diode and the 3rd diode; One cathode terminal of this first diode and a cathode terminal of this second diode are connected with an input of this second light-emitting diode group; One output of this second light-emitting diode group is connected with an end of an anode tap of the 4th diode and the 3rd switch; The other end of this second switch is connected with an input of the 3rd light-emitting diode group with a cathode terminal of the 4th diode; One output of the 3rd light-emitting diode group is connected with an anode tap of the 7th diode with an anode tap of the 6th diode; One cathode terminal of the 5th diode and a cathode terminal of the 6th diode are connected with an input of the 4th light-emitting diode group; One cathode terminal of the 3rd diode and a cathode terminal of the 7th diode are connected with an end of the 4th switch, and the other end of the other end of the 3rd switch and the 4th switch and an output of the 4th light-emitting diode group are connected to the other end of this power module; And
One voltage detecting and control circuit; It is according to the range of voltage values and at least two threshold voltages of this first voltage of this power module; The connection in series-parallel relation that changes these four groups of light-emitting diode group with conducting through controlling this first switch, this second switch, the 3rd switch and the 4th switch and open circuit is dynamically to change a driving voltage of this light-emitting diode dynamic module.
8. light-emitting diode assembly as claimed in claim 7, wherein this power module comprises an AC power and a rectification circuit, this rectification circuit is connected in this AC power, and with the negative voltage transposition of this AC power.
9. light-emitting diode assembly as claimed in claim 7; It also comprises one drive circuit; Be connected in this power module and this light-emitting diode dynamic module, in order to receive this first voltage and output certain value drive current to drive this light-emitting diode dynamic module.
10. light-emitting diode assembly as claimed in claim 9; Wherein when this first voltage is lower than one first threshold voltage; This this drive current of drive circuit output is to drive this light-emitting diode dynamic module; Wherein this first, second, third and the 4th switch conduction of this voltage detecting and control circuit control makes this first, second, third and the 4th light-emitting diode group be parallel connection.
11. light-emitting diode assembly as claimed in claim 10; Wherein when this first voltage of this power module is higher than this first threshold voltage and is lower than one second threshold voltage; Voltage detecting and control circuit this first switch of control and the 4th switch are open circuit; This second switch and the 3rd switch are conducting; Then this first light-emitting diode group and this second light-emitting diode group be for connecting, and the 3rd light-emitting diode group and the 4th light-emitting diode group are for connecting, and this first light-emitting diode group is parallelly connected with this second light-emitting diode group, the 3rd light-emitting diode group with the 4th light-emitting diode group.
12. light-emitting diode assembly as claimed in claim 11; Wherein when this first voltage of this power module during greater than this second threshold voltage; Voltage detecting and this first, second, third and the 4th switch of control circuit control are open circuit, and this first, second, third and the 4th light-emitting diode group is series connection.
13. a light-emitting diode assembly comprises:
One power module, its framework is in producing one first voltage;
One light-emitting diode dynamic module; Be electrically connected with this power module; And comprise at least three group light-emitting diode group, a plurality of diode and at least one group of switches set; Wherein these a plurality of diodes are connected between this three groups light-emitting diode group at least, and each this diode has an anode tap and a cathode terminal, and this at least one group of switches set comprises first switch and second switch; One end of this first switch is electrically connected on an end of this power module; The other end of this first switch is connected in respectively this cathode terminal of at least two diodes of these a plurality of diodes, and an end of this second switch is connected in the other end of this power module, and the other end of this second switch is connected in respectively this anode tap of at least two diodes of these a plurality of diodes; And
One voltage detecting and control circuit; It is according to range of voltage values and at least one threshold voltage of this first voltage of this power module; Change the connection in series-parallel relation of this at least three groups light-emitting diode group with this first switch through controlling this at least one group of switches set and this second switch conducting and open circuit, dynamically to change a driving voltage of this light-emitting diode dynamic module.
14. light-emitting diode assembly as claimed in claim 13 more comprises a diode, is connected in this other end of this first switch and this cathode terminal of corresponding this diode; And another diode, be connected in this other end of this second switch and this anode tap of corresponding this diode.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW100116974A TWI425661B (en) | 2011-05-13 | 2011-05-13 | Light emitting diode device |
| TW100116974 | 2011-05-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102781138A true CN102781138A (en) | 2012-11-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210137196XA Pending CN102781138A (en) | 2011-05-13 | 2012-05-04 | Light emitting diode device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102781138A (en) |
| TW (1) | TWI425661B (en) |
Cited By (5)
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| CN104918351A (en) * | 2014-03-14 | 2015-09-16 | 陈权霈 | Light emitting diode lamp string driving circuit |
| US9538595B2 (en) * | 2014-12-10 | 2017-01-03 | Lextar Electronics Corporation | Illumination device and light-emitting diode circuit |
| CN107046747A (en) * | 2016-02-06 | 2017-08-15 | 陕西亚成微电子股份有限公司 | A kind of LED adjusting control circuit |
| CN111369910A (en) * | 2015-12-15 | 2020-07-03 | 优显科技股份有限公司 | Photovoltaic device and method for manufacturing same |
| 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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| US9538595B2 (en) * | 2014-12-10 | 2017-01-03 | Lextar Electronics Corporation | Illumination device and light-emitting diode circuit |
| CN111369910A (en) * | 2015-12-15 | 2020-07-03 | 优显科技股份有限公司 | Photovoltaic device and method for manufacturing same |
| CN111369910B (en) * | 2015-12-15 | 2022-03-08 | 优显科技股份有限公司 | Photovoltaic device and method for manufacturing same |
| CN107046747A (en) * | 2016-02-06 | 2017-08-15 | 陕西亚成微电子股份有限公司 | A kind of LED adjusting control circuit |
| CN107046747B (en) * | 2016-02-06 | 2019-08-20 | 陕西亚成微电子股份有限公司 | A kind of LED light adjusting control 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201246598A (en) | 2012-11-16 |
| TWI425661B (en) | 2014-02-01 |
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Application publication date: 20121114 |