CN104853474A - Direct type light-emitting diode driving device - Google Patents
Direct type light-emitting diode driving device Download PDFInfo
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- CN104853474A CN104853474A CN201410818259.7A CN201410818259A CN104853474A CN 104853474 A CN104853474 A CN 104853474A CN 201410818259 A CN201410818259 A CN 201410818259A CN 104853474 A CN104853474 A CN 104853474A
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Abstract
The invention provides a direct type light-emitting diode driving device, which comprises a plurality of primary LED lamp strings composed of a plurality of LED units mutually connected in series, a plurality of secondary LED lamp string sets composed of a plurality of secondary LED lamp strings mutually connected in series and connected in series with the primary LED lamp strings, a presetting element composed of a diode rectifier for converting an AC input voltage into a pulse DC voltage, a power factor correction module connected to the diode rectifier and the first ends of the primary LED lamp strings and used for regulating the pulse DC voltage to be as a stable regulated output voltage so as to drive the primary LED lamp strings/the secondary LED lamp string sets, or drive the primary LED lamp strings and the secondary LED lamp string sets. A direct type driver is connected with all the secondary LED lamp strings and is composed of a current source to selectively switch off selected secondary LED lamp strings.
Description
Technical field
System of the present invention, about a kind of device of driving LED driver, is about a kind of direct-type LED drive device especially.
Background technology
Generally common light-emittingdiode (light emitting diode, LED) drive circuit has two kinds, one is suitching type drive circuit (switch drive), and another kind is then direct-type drive circuit (direct driver).Suitching type drive circuit can use a magnetic element (such as: inducer) to store electric energy from a power supply unit, and directly directly sends this electric energy to a LEC lamp string.The shortcoming that circuit is moved in suitching type district needs to install an electromagnetic filter (EMI Filter) in addition, need to install more element, and have obvious output current ripples (Output Current Ripple), but not larger electric capacity.
Direct-type drive circuit then can play the functioning efficiency up to 99%, only need less element, and cost is comparatively cheap.But the output current ripples of direct-type drive circuit then have obvious relevance with power factor (PF).In simple terms, if effective corrected power factor, the direct-type drive circuit producing output current ripples hardly can just be designed.
Therefore, develop that one still can highly effectively drive light fixture under various different input voltage, (harmonic distortion, the HD) characteristic that has low harmonics distortion, the LED drive device again with high merit filter factor and low amounts output current ripples be very important things.
Summary of the invention
According to above-mentioned demand, an object of the present invention is to provide a kind of direct-type light-emitting diode driving device, is to include a main LED string, a secondary LED string group, a presetting element, an Active PFC module and a direct-type driver.
Main LED string, is the LED unit including plural number and be mutually connected in series, and has a first end and one second end.Secondary LED string group, has a first end and one second end, and includes the secondary LED string of the mutual serial connection of plural number, and the first end system of secondary LED string group is connected to the second end of main LED string.Presetting element is include the diode rectifier that is connected to a power supply, so that an AC-input voltage of described power supply is converted to a pulsed dc voltage.Active PFC module, between the described first end being connected to diode rectifier and main LED string, system regulates described pulsed dc voltage to be a stable regulation and control output voltage, wherein, described burning voltage system exports to drive described main LED string, described secondary LED string group or to drive described main LED string and described secondary LED string group.Direct-type driver, cording has a current source, and connects each secondary LED string, optionally to close chosen secondary LED string.
In an embodiment, between described presetting element and described direct-type driver, more include a communication path.
In an embodiment, described direct-type driver more includes:
One current feedback path is the controller being connected to described presetting element; And
One current feedback module is produce a control voltage, to regulate and control the burning voltage of described output through the described controller of described current feedback path to described presetting element.
In an embodiment, described current feedback module more includes an integrating circuit and a current channel, integration electric system is connected between secondary LED string group and current source, and current channel system is connected to integrating circuit, and is the electric current coming selective regulation inflow current source with an indirect diode.Current feedback path more includes one first resistance, one second resistance and one the 3rd resistance.Second resistance is the first resistance being connected in series in current feedback path, and a contact system of the first resistance and the second resistance is connected to an internal comparator of controller inside, and internal comparator has an internal reference voltage.3rd resistance, cording has a first end and one second end, and first end is connected to a contact of the first resistance and the second resistance, and the second end is connected to described current channel.
In an embodiment, comparator system is made up of the operational amplifier that has a reference voltage, and current channel system one reverser, when the voltage of current source is higher than described reference voltage, can electric current be supplied.
In an embodiment, integrating circuit system drives the transefer conductance of a comparator to form by one, and current channel is a buffering.
In an embodiment, the coupling of presetting element system is in plural direct-type driver.
In an embodiment, each direct-type driver has a current feedback module, is that electric current is flowed out by current feedback path, and the electric current system of flowing out produces a control voltage.
In an embodiment, current feedback path more includes one first resistance, one second resistance and one the 3rd resistance.Second resistance is be connected in series in the first resistance, and a contact system of the first resistance and the second resistance is connected to an internal comparator of controller inside, and internal comparator has an internal reference voltage.3rd resistance, cording has a first end to be connected to a contact of the first resistance and the second resistance.
In an embodiment, direct-type light-emitting diode driving device more includes a protection diode, be arranged at the 3rd between resistance and current channel, and allowable current is flowed to presetting element by the contact of the first resistance and the second resistance.
In an embodiment, direct-type light-emitting diode driving device system includes an electric current inductive reactance, system senses the electric current corresponding to main its voltage of LED string being attached with secondary LED string, one internal current source, there is a predetermined current, when predetermined current equals the minimum amount of voltage that of output voltage, the current value that electric current inductive reactance senses, one water conservancy diversion diode, one first resistance, when the current value that electric current inductive reactance senses current value default higher than internal current source, first resistance allows that the electric current had more flows into water conservancy diversion diode, one error amplifier, cording has a reference voltage source, one NOMS electric crystal, system is connected to error amplifier to form current source, one offset resistance, and a REST resistance, system is connected to water conservancy diversion diode, and the deviation voltage produced between reference voltage source and REST resistance, wherein deviation voltage can reduce the electric current flowing into LED string.
In an embodiment, electric current inductive reactance, system is connected to the first end of main LED string and presetting element, first resistance, there is a first end, one second end and one the 3rd end, wherein, first end system connects electric current inductive reactance, and the second end system is connected to the second end of secondary LED string group, internal current source, it is the 3rd end of connection first resistance, water conservancy diversion diode, cording has an anode and a negative electrode, its Anodic system is connected to the 3rd end of the first resistance, error amplifier, cording has a positive input terminal, one negative input end and an output, wherein positive input terminal system is connected to a reference voltage source, and negative input end system is connected to the negative electrode of water conservancy diversion diode, NMOS electric crystal has a first end, one second end and one the 3rd end, wherein first end system is connected to the second end of secondary LED string group, second end system is connected to the output that mistake amplifies enterprise, 3rd end system is connected to REST resistance, and deviation resistance system is connected between the negative output terminal of error amplifier and REST resistance.
Therefore, there is the problem met with in the existing LED driver of solution in drive unit system of the present invention, presetting element can be used for the output voltage of answering various different range, and there is the characteristic of high power factor and low harmonics distortion, in addition presetting element only needs to provide a stable regulation and control output voltage, therefore can be stable by electric power supply to LED driver, LED driver moral is exported, and can not output voltage ripples (ripple) to provide a stable voltage.
Accompanying drawing explanation
Fig. 1 system illustrates a direct-type LED drive circuit structure schematic diagram of one embodiment of the invention.
The circuit framework of direct-type LED drive device in Fig. 2 system key diagram 1.
The Organization Chart of Fig. 3 system another embodiment of the present invention.
The Organization Chart of Fig. 4 system further embodiment of this invention.
Fig. 5 system illustrates the Organization Chart of yet another embodiment of the invention.
Fig. 6 system illustrates the execution mode of the direct-type LED drive device utilizing single presetting element drives plural number to be arranged in parallel each other mutually the present invention.
Fig. 7 system illustrates an execution mode of direct-type LED drive circuit.
[symbol description]
10 main LED strings
20 secondary LED string groups
200 secondary LED strings
30 presetting elements
301 diode rectifiers
302 Active PFC modules
3021 first capacitors
3022 inductors
3023 controllers
30231 internal comparator
3024 suitching type electric crystals
3025 diodes
3026 second capacitors
40 direct-type drivers
401 current sources
50 communication paths
60 current feedback modules
61 integrating circuit
62 current channels
63 current feedback paths
70 current feedback modules
71 integrating circuit
72 current channels
73 current feedback paths
80 electric current inductive reactances
81 first electric crystals
82 internal current source
83 water conservancy diversion diodes
84 error amplifier
85 MONS electric crystals
86 offset resistances
87 REST resistance
The indirect diode of D
D1 protects diode
R1 first resistance
R2 second resistance
R3 the 3rd resistance
Embodiment
Below only with embodiment, apparatus of the present invention or method are described.Below for the description being described as this case technical characteristic of embodiment.
Shown in Figure 1, Fig. 1 system illustrates a direct-type LED drive device structural representation of one embodiment of the invention.Direct-type LED drive device system includes a main LED string 10, secondary LED string group 20, presetting element 30 and a direct-type driver 40 in the present embodiment.Wherein, main LED string 10 includes the LED unit that plural number is connected mutually, and has a first end and one second end.Secondary LED string group 20 has a first end and one second end, and the secondary LED string 200 including the mutual series connection of plural number forms, the first end system of secondary LED string group 20 is connected to the second end of main LED string 10, wants LED string 200 all to include at least one LED unit each time.
Presetting element 30 includes diode rectifier 301 and an Active PFC module 302.Wherein, diode rectifier 301 is be connected to a power supply, and the AC-input voltage from power supply can be converted to a pulsed dc voltage.Active PFC module 302 be arranged at diode rectifier 301 and main LED string 10 first end between, and pulsed dc voltage is adjusted to a stable regulation and control output voltage (regulated output voltage).And presetting element 30 can supply multiple scope, and there is the input voltage of high power factor and low low harmonics distortion characteristic.It should be noted that presetting element 301 does not need the input current providing, as long as provide one stable and through the output voltage of regulation and control, this output voltage can have a small amount of but rational electric current ripples.
In one embodiment of this invention, presetting element 30 can have a boost type quasi-resonance (boost-mode quasi-resonant) framework.This presetting element 301 with boost type quasi-resonance framework is also the simplest application mode of one under can be applicable to the border of the feelings of a boundary scheme (boundary mode).The output voltage wave crest regulated and controled through presetting element 30 should fall within the maximum wave crest position of the AC-input voltage of power supply.Art is familiar with described item skill personage and all can be known easily, and the assembly with boost mode can only provide the output voltage identical or higher with AC-input voltage.
Please refer to shown in Fig. 2, the circuit framework of direct-type LED drive device in Fig. 2 system key diagram 1.Diode rectifier 301 in presetting element 30 is formed by four diodes.Active PFC module 302 includes one first capacitor 3021, inductor 3022, controller 3023, suitching type electric crystal (transistor) 3024, diode 3025 and one second capacitor 3026.Wherein, the first capacitor 3021 is be connected in parallel in diode rectifier 301, and has a first end and one second end.Inductor 3022 has a first end and one second end.The first end system of suitching type electric crystal 3024 is connected to the second end of inductor, and the second end of suitching type electric crystal 3024 is then connected to controller 3023.Second capacitor 3026 has a first end and one second end.Diode 3025 is be arranged between the first end of suitching type electric crystal 3024 and the first end of the second capacitor 3026.Second end of the first capacitor 3021 and the second capacitor 3026, and the 3rd end of suitching type electric crystal 3024 is then connected to a ground connection (common ground).
Direct-type driver 40 includes a current source 401, and is connected to and wants LED string 200 each time.Direct-type driver 40 optionally can close selected secondary LED string 200, to guarantee maximum LED drive efficiency.Current source 401 is be arranged between the second end of secondary LED string group 20 and the Active PFC module 302 of presetting element 30.Direct-type driver 40 (with adjoint main LED string 10 and secondary LED string group 20) has an operating voltage range preset, this preset range covers expection maximum output voltage and the expection minimum output voltage of presetting element 30, also contain the output voltage range of presetting element 30 regulation and control described in answering, and because the LED electrical pressure that temperature, diode life-span and operation variable cause changes.
Direct-type driver 40 can monitor the voltage across whole main LED string 10 and secondary LED string group 20, and adjusts electric current according to this, makes the overall output power of main LED string 10 and secondary LED string group 20 be maintained a constant.
As shown in Figure 2, direct-type LED drive device of the present invention more includes a communication path (communicating path) 50, is be arranged between presetting element 30 and direct-type driver 40.When the effective power scope of direct-type driver 40 increases, the quantity of secondary LED string 200 just can be reduced.For example, when temperature rising makes the voltage flowing to main LED string 10 become very small, just secondary LED string group 20 can be connected in series in main LED string 10.If secondary LED string group 20 lack enough secondary LED strings 200 in response to payment flow to the voltage of LED time, the voltage change so flowing through the current source 401 of direct-type driver 40 can increase, and bulk supply efficiency is reduced.Therefore, the voltage of senses flow through main LED string 10 and secondary LED string group 20 can be carried out through communication path 50 once the controller 3023 in presetting element 30, presetting element 30 just can reduce the regulation and control voltage of output, and makes direct-type driver 40 can play maximum working efficiency.In addition, in order to will through the voltage of communication path 50 senses flow through main LED string 10 and secondary LED string group 20, and regulating and controlling the overall brightness of main LED string 10 and secondary LED string group 20, the current source 401 that presetting element 30 can control direct-type driver 40 maintains stable light output.
Otherwise when supposing that the temperature of main LED string 10 and secondary LED string group 20 reduces, the voltage supplying main LED string 10 and secondary LED string group 20 becomes to be needed than more time general.Direct-type driver 40 can progressively remove from main LED string 10 voltage supplying secondary LED string group 20, to all secondary LED string groups 20 are all closed.Direct-type driver 40 can make presetting element 30 reduce the output of regulation and control voltage, and makes the operational paradigm that device can remain best.
Can the form of digitisation, analog voltage or electric current contact between presetting element 30 and direct-type driver 40.In order to avoid when secondary LED string 200 quantity close to during critical value (that is, greatest expected voltage or the minimum expected voltage of presetting element 30 are reached), can ceaselessly come and go ＂ with regard to two numerical value and talk ＂, therefore be necessary to add a magnetic hysteresis (hysteresis) in a control method of presetting its controller 3023 of element 30.
Because the action of presetting element 30 only has an one step, whole work efficiency can more than 97%.If the direct-type driver 40 connecting presetting element 30 can reach more than 98%, presetting element 30 then disclosed by the present invention and direct-type driver 40 combine, its effective power supplying efficiency can reach 95% (97% × 98%), such power supplying efficiency is splendid, and the high electric power system (high power system) that 10% efficiency just can cause the waste of many electricity or generation heat leakage is reduced for those, seem very important.
Please refer to shown in Fig. 3, the Organization Chart of Fig. 3 system another embodiment of the present invention? because the efficiency reduction of high electric power system can produce electricity waste or produce the problem of heat leakage, so more highlight the advantage of disclosed drive unit.In the present embodiment, a single presetting element 30 is be connected with a plurality of direct-type driver 40, because the expense of direct-type driver 40 is very cheap comparatively speaking, therefore excessively can't increase installation cost.When increasing when powering, the volume increasing presetting element 30 may be necessary, even if but amount of power supply becomes original twice, the volume of presetting element 30 and expense also can not higher than original twices, so the cost producing output voltage still can maintain state at a low price.
Please refer to shown in Fig. 4, Fig. 4 system illustrates the Organization Chart of further embodiment of this invention.The present embodiment is from the different of Fig. 3, and its controller 3023 of the presetting element 30 of the present embodiment does not use magnetic hysteresis control method.In the present embodiment, LED direct-type drive unit more includes the current feedback path 63 that a current feedback module 60 and is connected to the internal comparator 30231 in its controller 3023 of presetting element 30.Internal comparator 30231 has an internal reference voltage (Vrc).Current feedback module 60 is change its output voltage regulated and controled (Vout) for adjusting controller 3023, and includes an integrating circuit (integrator) 61 and a current channel (current passenger) 62.Current feedback path 63 includes one first resistance R1, one second resistance R2 and the 3rd resistance R3.Integrating circuit 61 is connect between secondary LED string group 20 and current source 401.Current channel 62 is be connected between integrating circuit 61 and the 3rd resistance R3, and carrys out selectivity increase according to a control voltage (Vadj) numerical value that an indirect diode D produces or reduce electric current supply.And after the first resistance R1 and the second resistance R2 system be connected in series mutually, then be connected in parallel in the second capacitor 3026.The first end system of the 3rd resistance R3 connects all in a contact (junction) of the first resistance R1 and the second resistance R2.Under such connected mode, one extracurrent can be injected contact between the first resistance R1 and the second resistance R2 through the 3rd resistance R3, and the output voltage (Vout) after regulation and control and the relation between control voltage (Vadj) can represent by following equation:
Vout＝[(Vrc×R2×R3/R1)+(R3×Vrc)+(R2×Vrc)-(R2×Vadj)]/R3。
In the embodiment that Fig. 4 discloses, integrating circuit 61 is be embedded in an operational amplifier (Operational Amplifier, op-Amp), and has a comparative voltage (Vr).Current channel 62 is a unidirectional reverser (inverter), because current channel 62 only allows that electric current is imported the 3rd resistance R3 to be reduced to regulate and control output voltage (Vout), and consider the relation of R1/R2, the output voltage through regulation and control can not higher than its internal voltage value.
Carrying out in the process operated, if pass through the average voltage level of current source 401 lower than reference voltage (Vr), just adjustment promotes the output of integrating circuit 61, and adjustment reduces the output with the current channel 62 of unidirectional reverser structure, and current channel 62 can be lockable and cannot operate.Increase once the average voltage level by current source 401 and higher than reference voltage (Vr), just start the output reducing current channel 62.When the voltage of power supply stream 401 is lower than an intermediate resistance value, current channel 62 can start for induced current, the regulation and control output voltage (Vout) of presetting element 30 to be reduced, intermediate resistance value is defined as the resistance value between the first resistance R1 and the second resistance R2, and the reference voltage (Vrc) being subject to internal comparator 30231 in controller 3023 affected.In the controller of many commercializations, in controller 3023, the inner parameter of the reference voltage (Vrc) of internal comparator 30231 is probably 2.5 volts.
Please refer to shown in Fig. 5, Fig. 5 system illustrates the Organization Chart of yet another embodiment of the invention.In the present embodiment, integrating circuit 61 is be embedded in a mutual conductance (transconductance) structure, that is drives the transefer conductance of a comparator to form by one, and current channel 62 then has the function of buffering.No matter the present embodiment is identical with the embodiment of Fig. 4 to be in, current channel 62 is structure or the buffer structure of reverser, all can only supply electric current according to the ratio of R1/R2, be reduced gradually to make output voltage by maximum.
Usually in general operation, LED unit can heat up and the voltage flowing through LED unit can reduce, and the voltage resulting through current source increases, and cause the decline of power supplying efficiency and fluorescent tube to produce the increase of used heat, therefore, can sense through current feedback module 60 in Fig. 4 or Fig. 5 embodiment of the present invention and increase situation by the voltage of current source 401, respond and reduce output voltage (Vout).As regulation and control output voltage, also can be reduced by the voltage of current source 401, increase power supplying efficiency to reach and reduce useless thermogenetic effect.
Fig. 4 or Fig. 5 embodiment presents superior efficacy of the present invention, particularly for an application class than light modulation fluorescent tube more obvious.In the process of carrying out analogy light modulation, when light modulation is to time the brightest, relatively very little numerical value can be reduced to by the electric current of LED, therefore flow through each LED unit in LED string voltage can also will be lower than by LED current full load many, so, can produce higher operating efficiency when carrying out analogy light modulation.
In the state that another is similar, if an overtemperature protection mechanism is applied to a LED module to reduce the electric current flowing through LED under a superheat state, and also can reduce along with the voltage drop flowing through LED through the output voltage that presetting element 30 regulates and controls.Can do you so just guarantee (LED?) device can not be used in overheated operation during antagonism operating voltage rising.
In addition, when the direct-type LED drive device utilizing single presetting element 30 to drive plural number to be arranged in parallel each other mutually, then need Fig. 4 or Fig. 5 to be carried out some and modify.Because under such a condition, required control voltage (Vadj) should described in be under remaining on minimum voltage status, but not under ceiling voltage state described in leading portion.
In order to address this problem, and the absolute maximum output voltage of maintenance one under the considering of fail safe, shown in Figure 6, Fig. 6 system illustrates the execution mode of the direct-type LED drive device utilizing single presetting element drives plural number to be arranged in parallel each other mutually the present invention.Each direct-type LED drive device (not shown) system is connected to a current feedback module 70, the current feedback module 60 described by this current feedback module 700 points of similar Fig. 4 or Fig. 5.Each current feedback module 70 includes the current channel 72 that an integrating circuit 71 and one and integrating circuit 71 are connected in series, the difference of Fig. 6 and Fig. 4 or Fig. 5 is, in current channel 72, the direction of indirect diode D is contrary, in such a state, electric current can only be derived by reverse in current channel 72 indirect diode D.That is current channel 62 is used to increase electric current in Fig. 4 or Fig. 5, the current channel 72 of the present embodiment is used to reduce electric current.
When all current channels 72 all interconnect, namely the minimum output voltage in current channel 72 is decided to be a control voltage (Vadj).Because the output voltage of current channel 72 is minimum, when electric current flows back to presetting element 30, the output voltage that presetting element 30 can be made to regulate and control is enough to supply main LED string 10 and the enough voltage of secondary LED string group 20 to maintain required electric current.
In the present embodiment, current feedback path 73 (not having antecedent) more includes a protection diode (securing diode) D1.Protection diode D1 system is arranged between the 3rd resistance R3 and current channel 72, and has an anode and a negative electrode.The anode system of protection diode D1 is connected with the 3rd resistance R3, and negative electrode is then connected with current channel 72.Protection diode D1 is only dissolved in electric current and is moved to presetting element 30 by the contact of the first resistance R1 and the second resistance R2, to guarantee that the output voltage through regulation and control can not more than the ratio of R1/R2.
Please refer to Fig. 7, Fig. 7 system illustrates an execution mode of direct-type LED drive circuit.As many self adaptation direct-type LED drive device (adaptive LED direct driver), the present embodiment needs to modify LED current to provide stable suitable output voltage, to increase or to remove secondary LED string 20 quantity being additional to main LED string 10.
In this embodiment, direct-type LED drive device includes electric current inductive reactance 80,1 first electric crystal 81, internal current source 82, water conservancy diversion diode (exceeding diode) 83, error amplifier 84, MONS electric crystal 85, offset resistance 86 and a REST resistance 87.
Wherein, electric current inductive reactance 80 is the first end and the presetting element 30 that connect main LED string 10.First electric crystal 81 has three ends, and wherein first end is connected to electric current inductive reactance 80, and the second end is connected to the second end of secondary LED string group 20.The connection of electric current inductive reactance 80 and the first electric crystal 81 can senses flow through main LED string 10 and additional secondary LED string 200 complete voltage (flow through electric current inductive reactance 80 electric current some be converted into voltage of the main LED string 10 of supply and additional secondary LED string 200).Internal current source 82 is the 3rd end being connected to the first electric crystal, and the current value of current source 82 be predetermined to be with when reaching minimum output voltage (that is, the minimum predicted voltage of direct-type LED drive device), the current value that electric current inductive reactance 80 senses is identical.
Water conservancy diversion diode 83 has an anode and a negative electrode, and its Anodic system is connected to the 3rd end of the first electric crystal 81.Error amplifier 84 has a positive input, a negative input and an output, wherein the positive input system of error amplifier 84 is connected to a reference voltage source (reference volatgesource, Vrs), the negative input system of error amplifier 84 is connected to the negative electrode of water conservancy diversion diode 83.MONS electric crystal 85 has three ends, and wherein first end system is connected to the second end of secondary LED string group 20, and the second end system is connected to the output of error amplifier 84, and the 3rd end is then connected to REST resistance 87.Offset resistance 86 is be connected between the negative input of error amplifier 84 and REST resistance 87.Error amplifier 84 and MONS electric crystal 85 can form a base current source, as the current source 401 described in leading portion.
When the current value flowing through electric current inductive reactance 80 is greater than the preset value of internal current source 82, too much electric current just can flow to water conservancy diversion diode 83, now, just the pressure drop through offset resistance 86 can be produced, and then the offset voltage produced between reference voltage source Vrs and REST resistance 87, and the electric current flowing through LED is reduced.The current value reduced can represent by following equation:
ILED＝(Vrs-R86×((VLED/R80)-I82))/R87。
Wherein, the current value that the resistance value that Vrs is the magnitude of voltage of reference voltage source, R86 is the resistance value of offset resistance 86, R80 is electric current inductive reactance 80, I82 are internal current source, R87 are the resistance values of REST resistance 87.
Claims (12)
1. a direct-type light-emitting diode driving device, is characterized in that, is include:
One main LED string, is the LED unit including plural number and be mutually connected in series, and has a first end and one second end;
One secondary LED string group, has a first end and one second end, and includes the secondary LED string of the mutual serial connection of plural number, and the described first end system of described secondary LED string group is connected to the second end of described main LED string;
One presetting element is include:
One diode rectifier, is connected to a power supply, is an AC-input voltage of described power supply is converted to a pulsed dc voltage; And
One Active PFC module, between the described first end being connected to described diode rectifier and described main LED string, system regulates described pulsed dc voltage to be a stable regulation and control output voltage, wherein, described burning voltage system exports to drive described main LED string, described secondary LED string group or to drive described main LED string and described secondary LED string group; And
One direct-type driver, cording has a current source, and connects each described secondary LED string, optionally to close chosen secondary LED string.
2. direct-type light-emitting diode driving device as claimed in claim 1, is characterized in that, more include a communication path between presetting element and described direct-type driver.
3. direct-type light-emitting diode driving device as claimed in claim 1, it is characterized in that, described direct-type driver more includes:
One current feedback path is the controller being connected to described presetting element; And
One current feedback module is produce a control voltage, to regulate and control the burning voltage of described output through the described controller of described current feedback path to described presetting element.
4. direct-type light-emitting diode driving device as claimed in claim 3, is characterized in that:
Described current feedback module more includes:
One integrating circuit is be connected between described secondary LED string group and described current source; And
One current channel is be connected to described integrating circuit, and is carry out with an indirect diode electric current that selective regulation flows into described current source;
Described current feedback path more includes:
One first resistance;
One second resistance is described first resistance being connected in series in described current feedback path, and a contact system of described first resistance and described second resistance is connected to an internal comparator of described controller inside, and described internal comparator has an internal reference voltage; And
One the 3rd resistance, cording has a first end and one second end, and described first end is connected to a contact of described first resistance and described second resistance, and described second end is connected to described current channel.
5. direct-type light-emitting diode driving device as claimed in claim 4, is characterized in that:
Described comparator system is made up of the operational amplifier that has a reference voltage; And
Described current channel system one reverser, when the voltage of described current source is higher than described reference voltage, can supply electric current.
6. direct-type light-emitting diode driving device as claimed in claim 4, is characterized in that:
Described integrating circuit system drives the transefer conductance of a comparator to form by one; And
Described current channel is a buffering.
7. direct-type light-emitting diode driving device as claimed in claim 3, it is characterized in that, the coupling of described presetting element system is in plural direct-type driver.
8. direct-type light-emitting diode driving device as claimed in claim 7, it is characterized in that, each described direct-type driver has a current feedback module, is that electric current is flowed out by described current feedback path, and the electric current system of flowing out produces a control voltage.
9. direct-type light-emitting diode driving device as claimed in claim 8, is characterized in that, described in
Current feedback path more includes:
One first resistance;
One second resistance is be connected in series in described first resistance, and a contact system of described first resistance and described second resistance is connected to an internal comparator of described controller inside, and described internal comparator has an internal reference voltage; And
One the 3rd resistance, cording has a first end to be connected to a contact of described first resistance and described second resistance.
10. direct-type light-emitting diode driving device as claimed in claim 9; it is characterized in that; described direct-type light-emitting diode driving device more includes a protection diode; described protection diode system is arranged between described 3rd resistance and described current channel, and allowable current is flowed to described presetting element by the contact of described first resistance and described second resistance.
11. direct-type light-emitting diode driving devices as claimed in claim 1, is characterized in that, described direct-type light-emitting diode driving device system includes:
One electric current inductive reactance is sense the electric current corresponding to main its voltage of LED string being attached with described secondary LED string;
One internal current source, has a predetermined current, when described predetermined current equals the minimum amount of voltage that of described regulation and control output voltage, and the current value that described electric current inductive reactance senses;
One water conservancy diversion diode;
One first resistance, when the current value that described electric current inductive reactance senses described current value default higher than described internal current source, described first resistance allows that the electric current had more flows into water conservancy diversion diode;
One error amplifier, cording has a reference voltage source;
One NOMS electric crystal is be connected to described error amplifier to form described current source;
One offset resistance; And
One REST resistance, is be connected to described water conservancy diversion diode, and produces the deviation voltage between described reference voltage source and described REST resistance, and wherein said deviation voltage can reduce the electric current flowing into LED string.
12. direct-type light-emitting diode driving devices as claimed in claim 11, is characterized in that:
Described electric current inductive reactance is be connected to the described first end of described main LED string and described presetting element;
Described first resistance, have a first end, one second end and one the 3rd end, wherein, described first end system connects described electric current inductive reactance, and described second end system is connected to the second end of described secondary LED string group;
Described internal current source is described 3rd end connecting described first resistance;
Described water conservancy diversion diode, cording has an anode and a negative electrode, and wherein said anode system is connected to the 3rd end of described first resistance;
Described error amplifier, cording has a positive input terminal, a negative input end and an output, wherein:
Described positive input terminal system is connected to a reference voltage source;
Described negative input end system is connected to the described negative electrode of described water conservancy diversion diode;
Described NMOS electric crystal has a first end, one second end and one the 3rd end, wherein said first end system is connected to the second end of described secondary LED string group, described second end system is connected to the output that described mistake amplifies enterprise, and described 3rd end system is connected to described REST resistance; And
Described deviation resistance system is connected between the negative output terminal of described error amplifier and described REST resistance.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201361920632P | 2013-12-24 | 2013-12-24 | |
| US61/920,632 | 2013-12-24 | ||
| US201462054896P | 2014-09-24 | 2014-09-24 | |
| US62/054,896 | 2014-09-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104853474A true CN104853474A (en) | 2015-08-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410818259.7A Pending CN104853474A (en) | 2013-12-24 | 2014-12-24 | Direct type light-emitting diode driving device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN104853474A (en) |
| TW (1) | TW201526707A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101631411A (en) * | 2008-07-15 | 2010-01-20 | 英特赛尔美国股份有限公司 | Dynamic headroom control for LED driver |
| US20100134018A1 (en) * | 2008-11-30 | 2010-06-03 | Microsemi Corp. - Analog Mixed Signal Group Ltd. | Led string driver with light intensity responsive to input voltage |
| US20120223649A1 (en) * | 2009-08-18 | 2012-09-06 | Eldolab Holding B.V. | Control unit for led assembly and lighting system |
| CN103428959A (en) * | 2012-05-16 | 2013-12-04 | 理查德·兰德里·格雷 | Device and method for driving an LED light |
| US20140042918A1 (en) * | 2011-04-09 | 2014-02-13 | Dong-il Lee | Led driving device and led driving method using same |
-
2014
- 2014-12-24 CN CN201410818259.7A patent/CN104853474A/en active Pending
- 2014-12-24 TW TW103145432A patent/TW201526707A/en unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101631411A (en) * | 2008-07-15 | 2010-01-20 | 英特赛尔美国股份有限公司 | Dynamic headroom control for LED driver |
| US20100134018A1 (en) * | 2008-11-30 | 2010-06-03 | Microsemi Corp. - Analog Mixed Signal Group Ltd. | Led string driver with light intensity responsive to input voltage |
| US20120223649A1 (en) * | 2009-08-18 | 2012-09-06 | Eldolab Holding B.V. | Control unit for led assembly and lighting system |
| US20140042918A1 (en) * | 2011-04-09 | 2014-02-13 | Dong-il Lee | Led driving device and led driving method using same |
| CN103428959A (en) * | 2012-05-16 | 2013-12-04 | 理查德·兰德里·格雷 | Device and method for driving an LED light |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201526707A (en) | 2015-07-01 |
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