CN103379695A - Driving circuit capable of improving utilization rate of LED apparatus, and relative constant current regulator - Google Patents
Driving circuit capable of improving utilization rate of LED apparatus, and relative constant current regulator Download PDFInfo
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Abstract
The invention proposes a driving circuit which is used for driving an LED array. The LED array includes a first to a fourth LED apparatus and a diode apparatus, wherein the second LED apparatus is connected to the first LED apparatus; the fourth LED apparatus is connected to the third LED apparatus; the diode apparatus is connected between the second LED apparatus and the third LED apparatus. The driving circuit includes a first constant current regulator which is coupled between the first LED apparatus and the second LED apparatus, a second constant current regulator which is coupled between the second LED apparatus and the third LED apparatus, a third constant current regulator which is coupled between the third LED apparatus and the fourth LED apparatus, a fourth constant current regulator which is coupled between the fourth LED apparatus and a fixed potential, and a control circuit which is coupled among the first to the fourth constant current regulator. When an input voltage of a target constant current regulator exceeds a critical voltage, the current is regulated down to below a predetermined critical value. The driving circuit can substantially improve a utilization rate of the LED apparatuses in the LED array and raise luminance efficacy of the LED array.
Description
Technical field
The relevant drive circuit of the present invention, espespecially a kind of drive circuit that improves the LED matrix luminous efficiency reaches the relevant current regulator of deciding.
Background technology
Manyly come the driving LED device with LED matrix as the electric power that traditional light-emitting device of light source need rely on AC power and provides, thus often can electrochemical capacitor be set at the voltage input path, to promote the luminous efficiency of LED matrix.Yet the wear life of electrochemical capacitor is usually short than LED matrix.In case electrochemical capacitor breaks down, traditional light-emitting device just can't normal operation.Clearly, electrochemical capacitor is set in light-emitting device not only can causes harmful effect to the power factor of light-emitting device, also can reduce reliability (reliability) and the wear life of light-emitting device.
Summary of the invention
In view of this, how effectively to promote power factor and the reliability of light-emitting device, and improve simultaneously the utilization rate of the LED matrix in the light-emitting device, real is the industry problems to be solved.
This specification provides a kind of embodiment of the drive circuit for driving a led array.This led array includes: one first LED matrix, one second LED matrix, one the 3rd LED matrix, one the 4th LED matrix and one first diode apparatus, wherein this second LED matrix is connected in this first LED matrix, the 4th LED matrix is connected in the 3rd LED matrix, and this first diode apparatus is connected between this second LED matrix and the 3rd LED matrix.This drive circuit includes: one first decides current regulator, is used for being coupled between this first LED matrix and this second LED matrix; One second decides current regulator, is used for being coupled between this second LED matrix and the 3rd LED matrix; One the 3rd decides current regulator, is used for being coupled between the 3rd LED matrix and the 4th LED matrix; One the 4th decides current regulator, is used for being coupled between the 4th LED matrix and the fixed potential; And a control circuit, be coupled to this first, this second, the 3rd and the 4th decides current regulator; Wherein when this first, this is the second, the 3rd and the 4th when deciding input voltage that a target in the current regulator decides current regulator and surpassing the critical voltage of a correspondence, this target is decided current regulator can be according to the control of this control circuit, and the electric current of this target of flowing through being decided current regulator is cut to below the predetermined critical.
This specification provides a kind of embodiment of the drive circuit for driving a led array in addition.This led array includes: one first LED matrix, one second LED matrix, one the 3rd LED matrix, one the 4th LED matrix, one first diode apparatus, and one first switch, wherein this second LED matrix is connected in this first LED matrix, the 4th LED matrix is connected in the 3rd LED matrix, this first diode apparatus is connected between this second LED matrix and the 3rd LED matrix, and this first switch (131) is connected between the 3rd LED matrix and this first LED matrix.This drive circuit includes: one first decides current regulator, is used for being coupled between this first LED matrix and this second LED matrix; One second decides current regulator, is used for being coupled between this second LED matrix and the 3rd LED matrix; One the 3rd decides current regulator, is used for being coupled between the 3rd LED matrix and the 4th LED matrix; One the 4th decides current regulator, is used for being coupled between the 4th LED matrix and the fixed potential; And a control circuit, be coupled to this first, this second, the 3rd and the 4th decides current regulator; Wherein when this first, this is the second, the 3rd and the 4th when deciding input voltage that a target in the current regulator decides current regulator and surpassing the critical voltage of a correspondence, this target is decided current regulator can be according to the control of this control circuit, the electric current of this target of flowing through being decided current regulator is cut to below the predetermined critical, and when an input voltage of this led array during between one second critical voltage and the 3rd critical voltage, this control circuit can end this first switch.
This specification provides a kind of embodiment of the drive circuit for driving a led array in addition.This led array includes: one first LED matrix, one second LED matrix, one the 3rd LED matrix, one the 4th LED matrix and one first diode apparatus, wherein this second LED matrix is connected in this first LED matrix, the 4th LED matrix is connected in the 3rd LED matrix, and this first diode apparatus is connected between this second LED matrix and the 3rd LED matrix.This drive circuit includes: one first switch is used for being coupled between the 3rd LED matrix and this first LED matrix; One first decides current regulator, is used for being coupled between this first LED matrix and this second LED matrix; One second decides current regulator, is used for being coupled between this second LED matrix and the 3rd LED matrix; One the 3rd decides current regulator, is used for being coupled between the 3rd LED matrix and the 4th LED matrix; One the 4th decides current regulator, is used for being coupled between the 4th LED matrix and the fixed potential; And a control circuit, be coupled to this first, this second, the 3rd and the 4th decides current regulator; Wherein when this first, this is the second, the 3rd and the 4th when deciding input voltage that a target in the current regulator decides current regulator and surpassing the critical voltage of a correspondence, this target is decided current regulator can be according to the control of this control circuit, the electric current of this target of flowing through being decided current regulator is cut to below the predetermined critical, and when an input voltage of this led array during between one second critical voltage and the 3rd critical voltage, this control circuit can end this first switch.
One of advantage of above-mentioned drive circuit is the utilization rate that can significantly improve the LED matrix of led array, promotes the led array luminous efficacy.
Another advantage of above-mentioned drive circuit is that the wear life that prolongs LED matrix is had positive benefiting, and also can reduce the situation that flicker occurs LED matrix.
This specification provides a kind of current regulator of deciding in addition, includes: a first transistor, and its first end is coupled to an input voltage; One transistor seconds, its first end are coupled to the second end and the control end of this first transistor; One the 3rd transistor, its first end is coupled to the first end of this first transistor, and the 3rd transistorized control end is coupled to the first end of this transistor seconds; One first resistance, its first end are coupled to the 3rd transistorized the second end, and the second end of this first resistance is coupled to the control end of this transistor seconds; One second resistance, its first end is coupled to the control end of this transistor seconds, and the second end of this second resistance is coupled to the second end of this transistor seconds; And one the 3rd resistance, its first end is coupled to the 3rd transistorized the second end, and the second end of the 3rd resistance is coupled to a fixed potential.
Other advantage of the present invention will explain orally in more detail by the following description and accompanying drawing.
Description of drawings
Fig. 1 is the functional block diagram after an embodiment of the present invention's light-emitting device simplifies.
Fig. 2 is the local function calcspar after an embodiment of the drive circuit among Fig. 1 simplifies.
Fig. 3 is the local function calcspar after another embodiment of the drive circuit among Fig. 1 simplifies.
Fig. 4 is the functional block diagram after another embodiment of the present invention's light-emitting device simplifies.
Embodiment
Below will cooperate correlative type that the present invention's embodiment is described.In these were graphic, identical label represented identical or similar element or process step.
In the middle of specification and follow-up claim, used some vocabulary to censure specific element.The person of ordinary skill in the field should understand, and same element may be called with different nouns.This specification and follow-up claim are not used as distinguishing the mode of element with the difference of title, but the benchmark that is used as distinguishing with the difference of element on function.Be an open term mentioned " comprising " in the middle of specification and the follow-up claim in the whole text, so should be construed to " comprise but be not limited to ... ".In addition, " couple " word this comprise any directly and indirectly connect means.Therefore, be coupled to one second element if describe one first element in the literary composition, then represent this first element and can directly (comprise by signal connected modes such as electric connection or wireless transmission, optical delivery) and be connected in this second element, or by other element or connection means indirectly electrically or signal be connected to this second element.
Used herein " and/or " describing mode, comprise cited one of them or the combination in any of a plurality of projects.In addition, unless specialize in this specification, the term of any odd number lattice all comprises the connotation of plural lattice simultaneously.
Fig. 1 is the functional block diagram after the light-emitting device 100 of one embodiment of the invention is simplified.Light-emitting device 100 includes AC power 102, bridge rectifier 104, led array 110, switch arrays 130 and drive circuit 140.Bridge rectifier 104 is used for the alternating voltage Vac that AC power 102 provides is rectified into the input voltage vin of m shape ripple, to offer led array 110.Switch arrays 130 and drive circuit 140 all are coupled to led array 110.
Include a plurality of LED matrix and one or more diode apparatus in the led array 110, then include one or more switch in the switch arrays 130.For example, in the embodiment in figure 1, led array 110 includes the first LED matrix 111, the second LED matrix 112, the 3rd LED matrix 113, the 4th LED matrix 114, the 5th LED matrix 115, the 6th LED matrix 116, the first diode apparatus 121 and the second diode apparatus 122.LED matrix 112 is connected in LED matrix 111.LED matrix 114 is connected in LED matrix 113.LED matrix 116 is connected in LED matrix 115.Diode apparatus 121 is connected between LED matrix 112 and the LED matrix 113.122 of diode apparatus are coupled between another LED matrix in LED matrix 115 and the led array 110.For example, if only have six LED matrix 111～116 in the led array 110, then diode apparatus 122 can be connected between LED matrix 115 and the LED matrix 114.In led array 110, each LED matrix all can realize with one or more LED element, and each diode apparatus all can be realized with one or more diode element.
In the embodiment in figure 1, switch arrays 130 include the first switch 131 and second switch 132 in parallel.Switch 131 is connected between LED matrix 113 and the LED matrix 111.132 on switch is connected between LED matrix 115 and the LED matrix 111.
When running, drive circuit 140 can be by the running of each switch in the control switch array 130, dynamically adjust the current path configuration of the LED matrix 111～116 in the led array 110, so that LED matrix 111～116 is switched between configuration with connecting in configuration in parallel.Such framework can effectively promote the utilization rate of these LED matrix, and then improves the illumination effect of led array 110.
In the embodiment in figure 1, drive circuit 140 includes first and decides current regulator (constant current regulator) 151, second and decide current regulator 152, the 3rd and decide current regulator 153, the 4th and decide current regulator 154, the 5th and decide current regulator 155, the 6th and decide current regulator 156, and control circuit 160.Deciding current regulator 151 is used for being coupled between LED matrix 111 and the LED matrix 112.Deciding current regulator 152 is used for being coupled between LED matrix 112 and the LED matrix 113.Deciding current regulator 153 is used for being coupled between LED matrix 113 and the LED matrix 114.Deciding current regulator 154 is used for being coupled between LED matrix 114 and the fixed potential (for example earth terminal).Deciding current regulator 155 is used for being coupled between LED matrix 115 and the LED matrix 116.Deciding current regulator 156 is used for being coupled between LED matrix 116 and the fixed potential (for example earth terminal).
For ease of narration, in this specification and follow-up claim, call with " target is decided current regulator " word and decide one in the current regulator 151～156 and specific do not decide current regulator.When the input voltage that the target in deciding current regulator 151～156 is decided current regulator surpasses a corresponding critical voltage, this target is decided current regulator can be according to the control of control circuit 160, the electric current of this target of flowing through being decided current regulator is cut to below the predetermined critical, for example drops to 0.In one embodiment, when the input voltage V1 that decides current regulator 151 surpassed the first critical voltage Vb1, deciding current regulator 151 can be according to the control of control circuit 160, and the current i 1 of deciding current regulator 151 with flowing through is cut to below the predetermined critical.When the input voltage V2 that decides current regulator 152 surpassed the second critical voltage Vb2, deciding current regulator 152 can be according to the control of control circuit 160, and the current i 2 of deciding current regulator 152 with flowing through is cut to below the predetermined critical.When the input voltage V3 that decides current regulator 153 surpassed the 3rd critical voltage Vb3, deciding current regulator 153 can be according to the control of control circuit 160, and the current i 3 of deciding current regulator 153 with flowing through is cut to below the predetermined critical.When the input voltage V4 that decides current regulator 154 surpassed the 4th critical voltage Vb4, deciding current regulator 154 can be according to the control of control circuit 160, and the current i 4 of deciding current regulator 154 with flowing through is cut to below the predetermined critical.When the input voltage V5 that decides current regulator 155 surpassed the 5th critical voltage Vb5, deciding current regulator 155 can be according to the control of control circuit 160, and the current i 5 of deciding current regulator 155 with flowing through is cut to below the predetermined critical.When the input voltage V6 that decides current regulator 156 surpassed the 6th critical voltage Vb6, deciding current regulator 156 can be according to the control of control circuit 160, and the current i 6 of deciding current regulator 156 with flowing through is cut to below the predetermined critical.The relative size relation of aforesaid critical voltage Vb1～Vb6 is Vb6＞Vb5＞Vb4＞VB3＞VB2＞Vb1.
Fig. 2 illustrate is an embodiment of the drive circuit 140 among Fig. 1 local function calcspar after simplifying.For convenience of description, in Fig. 2, only as illustrating in the drive circuit 140 each, example decides the execution mode of current regulator to decide current regulator 151.
In the present embodiment, deciding current regulator 151 includes the first transistor 211, transistor seconds 212, the 3rd transistor 213, the first resistance 214, the second resistance 215, reaches the 3rd resistance 216.The first end of transistor 211 is coupled to the input voltage V1 that decides current regulator 151.The first end of transistor 212 is coupled to the second end and the control end of transistor 211.The first end of transistor 213 is coupled to the first end of transistor 211, and the control end of transistor 213 is coupled to the first end of transistor 212.The first end of resistance 214 is coupled to the second end of transistor 213, and the second end of resistance 214 is coupled to the control end of transistor 212.The first end of resistance 215 is coupled to the control end of transistor 212, and the second end of resistance 215 is coupled to the second end of transistor 212.The first end of resistance 216 is coupled to the second end of transistor 213, and the second end of resistance 216 is coupled to a fixed potential.
In the present embodiment, the control circuit 160 of drive circuit 140 includes many group circuit for detecting, is respectively coupled to decide current regulator 151～156 in the control drive circuit 140, is used for detecting deciding 151～156 other input voltages of current regulator.As shown in Figure 2, being used for controlling the circuit for detecting 220 of deciding current regulator 151 in the control circuit 160 includes the 4th transistor 221, the 3rd diode apparatus 222, the 5th transistor 223, the 4th resistance 224, reaches the 5th resistance 225.Diode apparatus 222 includes one or more diode element, and is coupled to the first end of transistor 221 and decides between the input voltage V1 of current regulator 151.The first end of transistor 223 is coupled to the control end of the transistor 213 of deciding in the current regulator 151, and the control end of transistor 223 is coupled to the second end of transistor 221.The first end of resistance 224 is coupled to the control end of transistor 223, and the second end of resistance 224 is coupled to the control end of transistor 221.The first end of resistance 225 is coupled to the control end of transistor 223, and the second end of resistance 225 is coupled to a fixed potential.The critical voltage Vb1 that decides current regulator 151 depends on the breakdown voltage of diode apparatus 222.
On the implementation, the transistor 212 and 213 of deciding in the current regulator 151 can be realized with the transistor of same-type, also can realize with dissimilar transistors respectively.Similarly, the transistor 221 in the circuit for detecting 220 and 223 can be realized with the transistor of same-type, also can realize with dissimilar transistors respectively.For example, in one embodiment, transistor 221 in the circuit for detecting 220 and the transistor 211 of decide in the current regulator 151 can utilize junction field effect transistor (JFET) to realize, circuit for detecting 220 with decide in the current regulator 151 other transistor then available metal-oxide-semiconductor (MOS) (MOS) transistor realize.
As the input voltage V1 that decides current regulator 151 during less than the breakdown voltage of diode apparatus 222, the second end of the transistor 221 in the circuit for detecting 220 can be in electronegative potential.At this moment, transistor 223 can be in cut-off (turn off) state, the current i 1 of deciding current regulator 151 of flowing through then be keep haply fixing.
As the input voltage V1 that decides current regulator 151 during greater than the breakdown voltage of diode apparatus 222, input voltage V1 can run through diode apparatus 222, so that the second end-grain cutting of transistor 221 changes to high potential and conducting (turn on) transistor 223, and and then cut-off decide transistor 213 in the current regulator 151.At this moment, the current i 1 of deciding current regulator 151 of flowing through can reduce to 0.On the implementation, can all be designed to decide the identical circuit structure of current regulator 151 with aforementioned with deciding current regulator 152～156, to simplify the complexity in the circuit control.
Similarly, can will be used for controlling other circuit for detecting of deciding current regulator 152～156 in the control circuit 160, all be designed to the framework identical with aforementioned circuit for detecting 220.Because it is not identical to decide the critical voltage of current regulator 151～156, so the diode apparatus in other circuit for detecting also will be done corresponding adjustment, so that the breakdown voltage of diode apparatus can be complementary with the corresponding critical voltage of deciding current regulator.For example, because the critical voltage Vb2 that decides current regulator 152 is greater than the critical voltage Vb1 that decides current regulator 151, so decide the breakdown voltage that the breakdown voltage of the diode apparatus in the current regulator 152 corresponding circuit for detecting also is greater than aforementioned diodes device 222.Again for example, owing to decide the critical voltage Vb6 of current regulator 156 greater than the critical voltage Vb5 that decides current regulator 155, so decide the breakdown voltage of the diode apparatus in the current regulator 156 corresponding circuit for detecting, also be greater than the breakdown voltage of deciding the diode apparatus in the current regulator 155 corresponding circuit for detecting.
About the circuit running explanation of deciding 220 of current regulator 151 and circuit for detecting among Fig. 2, also be applicable to decide current regulator 152～156 and corresponding other circuit for detecting separately, for simplicity's sake, at this repeated description not.
In certain embodiments, also can only in control circuit 160, for deciding current regulator 151～155 corresponding a plurality of circuit for detecting be set respectively, be used for controlling the circuit for detecting of deciding current regulator 156 and omit, to save circuit area.
As previously mentioned, drive circuit 140 can be by the running of each switch in the control switch array 130, dynamically adjust the current path configuration of the LED matrix 111～116 in the led array 110, so that LED matrix 111～116 is switched between configuration with connecting in configuration in parallel.For convenience of description, below hypothesis LED matrix 111～116 has identical forward voltage VF, and diode apparatus 121 and 122 has identical forward voltage VFD.
When the input voltage vin of led array 110 greater than VF but when deciding the critical voltage Vb1 of current regulator 151, switch 131 and switch 132 in the control circuit 160 meeting actuating switch arrays 130 in the drive circuit 140, so that can flowing to via LED matrix 111, the electric current of bridge rectifier 104 outputs decides current regulator 151, also can flow to via LED matrix 113 and decide current regulator 153, also can flow to via LED matrix 115 simultaneously and decide current regulator 155.At this moment, LED matrix 111,113 and 115 can be luminous, and the three can form configuration in parallel.
When the input voltage vin of led array 110 greater than 2VF but when deciding the critical voltage Vb2 of current regulator 152, deciding current regulator 151 can be according to the control of control circuit 160, the current i 1 of deciding current regulator 151 with flowing through is cut to 0, and switch 131 and switch 132 in the control circuit 160 meeting actuating switch arrays 130.Thus, the electric current of bridge rectifier 104 outputs can flow to via LED matrix 111 and 112 decides current regulator 152, also can flow to via LED matrix 113 and 114 and decide current regulator 154, also can flow to via LED matrix 115 and 116 simultaneously and decide current regulator 156.At this moment, LED matrix 111～116 all can be luminous, and LED matrix 111 and the 112 LED tandems that form, and meeting and LED matrix 113 and the 114 LED tandems that form form configuration in parallel, also can form configuration in parallel with LED matrix 115 and the 116 LED tandems that form simultaneously.
When the input voltage Vi of led array 110 n greater than 3VF+VFD but when deciding the critical voltage Vb3 of current regulator 153, decide current regulator 151 and current i 1 can be cut to 0, decide current regulator 152 and also current i 2 can be cut to 0, and switch 132 and cutoff switch 131 in the control circuit 160 meeting actuating switch arrays 130, wherein 3VF+VFD can be greater than the critical voltage Vb2 that decides current regulator 152.Thus, the electric current of bridge rectifier 104 outputs can flow to via LED matrix 111,112 and 113 decides current regulator 153, also can flow to via LED matrix 115 and 116 and decide current regulator 156.At this moment, LED matrix 111～113,115 and 116 all can be luminous, and the LED tandem of LED matrix 111～113 compositions, and meeting and LED matrix 115 and the 116 LED tandems that form form configuration in parallel.
When the input voltage Vi of led array 110 n greater than 4VF+VFD but when deciding the critical voltage Vb4 of current regulator 154, decide current regulator 151 and current i 1 can be cut to 0, decide current regulator 152 and current i 2 can be cut to 0, decide current regulator 153 and also current i 3 can be cut to 0, and switch 132 and cutoff switch 131 in the control circuit 160 meeting actuating switch arrays 130, wherein 4VF+VFD can be greater than the critical voltage Vb 3 that decides current regulator 153.Thus, the electric current of bridge rectifier 104 outputs can flow to via LED matrix 111,112,113 and 114 decides current regulator 154, also can flow to via LED matrix 115 and 116 and decide current regulator 156.At this moment, LED matrix 111～116 all can be luminous, and the LED tandem of LED matrix 111～114 compositions, and meeting and LED matrix 115 and the 116 LED tandems that form form configuration in parallel.
When the input voltage vin of led array 110 greater than 5VF+2VFD but when deciding the critical voltage Vb5 of current regulator 155, decide current regulator 151 and current i 1 can be cut to 0, decide current regulator 152 and current i 2 can be cut to 0, decide current regulator 153 and current i 3 can be cut to 0, decide current regulator 154 and also current i 4 can be cut to 0, and switch 131 and switch 132 in the control circuit 160 meeting cutoff switch arrays 130, wherein 5VF+VFD can be greater than the critical voltage Vb4 that decides current regulator 154.Thus, the electric current of bridge rectifier 104 outputs can flow to via LED matrix 111,112,113,114 and 115 and decide current regulator 155.At this moment, LED matrix 111～115 can be luminous, and can form the tandem configuration.
When the input voltage vin of led array 110 greater than 6VF+2VFD but when deciding the critical voltage Vb6 of current regulator 156, deciding current regulator 151～155 can be cut to 0 with current i 1～i 5, and switch 131 and switch 132 in the control circuit 160 meeting cutoff switch arrays 130.Thus, the electric current of bridge rectifier 104 outputs can flow to via LED matrix 111,112,113,114,115 and 116 and decide current regulator 156.At this moment, LED matrix 111～116 all can be luminous, and can form the tandem configuration.
When the input voltage vin of led array 110 reduced gradually, drive circuit 140 can be reversed aforesaid operation workflow.
By above stated specification as can be known, when the input voltage V of led array 110 in is between VF～2VF, drive circuit 140 with regard to can driving LED in the array 110 at least the LED matrix of half carry out luminously, but not can only drive single LED matrix.When the input voltage Vi of led array 110 n was between 2VF～3VF, drive circuit 140 carried out luminous with regard to the whole LED matrix in the energy driving LED array 110, but not can only drive 2 LED matrix.When the input voltage Vi of led array 110 n was between 3VF～4VF, drive circuit 140 carried out luminous with regard to 4 LED matrix in the energy driving LED array 110, but not can only drive 3 LED matrix.When the input voltage Vi of led array 110 n was between 4VF～5VF, drive circuit 140 carried out luminous with regard to the whole LED matrix in the energy driving LED array 110, but not can only drive 4 LED matrix.
Clearly, the framework of aforementioned drive circuit 140 can significantly improve the utilization rate of the LED matrix in the led array 110, so that led array 110 is in the situation of the LED matrix of using same quantity, has more superior illumination effect than the framework of other correlation technique.
In addition, as shown in Figure 1,110 of bridge rectifier 104 and led array also have any electrochemical capacitor are set.And aforementioned will the flow through electric current of LED matrix of drive circuit 140 that utilizes is kept stable mechanism, and the wear life that prolongs LED matrix is had positive benefiting, and also can reduce the situation that flicker occurs LED matrix.Therefore, the power factor that not only can make light-emitting device 100 is higher than the traditional light-emitting device that uses electrochemical capacitor, and wear life and reliability also can be more desirable.
As previously mentioned, include to control among some embodiment of the corresponding circuit for detecting of deciding current regulator 156 at control circuit 160, when the input voltage V6 that decides current regulator 156 rises to above critical voltage Vb6, deciding current regulator 156 just can be according to the control of the circuit for detecting of correspondence, decides current regulator 156 current i 6 and is cut to 0 and will flow through.At this moment, the control circuit 160 that is equivalent in the drive circuit 140 provides the function of whole led array 110 being carried out overvoltage protection (over voltage protection).
In certain embodiments, when the temperature that the target in deciding current regulator 151～156 is decided current regulator surpasses a critical temperature, this target is decided current regulator can according to the control of control circuit 160, downgrade the size of current that this target of flowing through is decided current regulator.
For example, Fig. 3 illustrate is another embodiment of the drive circuit 140 among Fig. 1 local function calcspar after simplifying.Drive circuit 140 among Fig. 3 is very similar with the embodiment of earlier figures 2; difference is that the control circuit 160 among Fig. 3 includes many group thermal-shutdown circuits 320 in addition; be respectively coupled to control and decide current regulator 151～156 in the drive circuit 140, be used for providing for deciding current regulator 151～156 mechanism of over-temperature protection.
As shown in Figure 3, be used for protecting the thermal-shutdown circuit 320 of deciding current regulator 151 to include the 6th transistor 321, the 7th transistor 322 and the 8th transistor 323 in the control circuit 160.The first end of transistor 321 is coupled to the control end of the transistor 213 of deciding in the current regulator 151, and the control end of transistor 321 is coupled to the second end of resistance 214.The first end of transistor 322 is coupled to the control end of transistor 213, and the control end of transistor 322 is coupled to the second end of transistor 321.The first end of transistor 323 is coupled to the control end of transistor 213, and the control end of transistor 323 is coupled to the second end of transistor 322.
In the embodiments of figure 3, when circuit temperature when predetermined critical temperature is following, the cross-pressure of decide resistance 216 in the current regulator 151 is the voltage decision by the control end of transistor 212.Along with the gradually rising of circuit temperature, the voltage drop amplitude of the control end of the transistor 321 in the thermal-shutdown circuit 320 can be greater than the voltage drop amplitude of the control end of deciding the transistor 212 in the current regulator 151.Therefore, when circuit temperature rises to when surpassing predetermined critical temperature, the cross-pressure of decide resistance 216 in the current regulator 151 can change the voltage decision by the control end of the transistor 321 in the thermal-shutdown circuit 320.Thus, the cross-pressure of resistance 216 can be dragged down gradually, so that the current i 1 of deciding current regulator 151 of flowing through is also followed gradually reduction, and reaches the function of over-temperature protection.On the implementation, the transistor 321～323 in the thermal-shutdown circuit 320 at least one of them or all, available bipolar junction transistor (BJT) is realized.
On the implementation, can will be used for protecting other thermal-shutdown circuit of deciding current regulator 152～156 in the control circuit 160, all be designed to the framework identical with aforementioned thermal-shutdown circuit 320.About the circuit running explanation of deciding 320 of current regulator 151 and thermal-shutdown circuits among Fig. 3, also be applicable to decide current regulator 152～156 and corresponding other thermal-shutdown circuit separately, for simplicity's sake, at this repeated description not.
In addition, also can only decide the thermal-shutdown circuit that current regulator arranges correspondence for the part of deciding in the current regulator 151～156, to save circuit area.For example, can only arrange in the control circuit 160 and be used for protecting the corresponding thermal-shutdown circuit of deciding current regulator 156, and not be other the thermal-shutdown circuit that current regulator 151～155 arranges correspondence of deciding.
Fig. 4 is the functional block diagram after the light-emitting device 400 of another embodiment of the present invention is simplified.Light-emitting device 400 is very similar with the light-emitting device 100 among Fig. 1, and difference is in the led array 410 of light-emitting device 400 with LED matrix 421 and 422 diode apparatus 121 and 122 that replace among Fig. 1.On the implementation, LED matrix 421 and 422 can realize with one or more LED element.Because LED matrix 421 and 422 also has lighting function, therefore, when drive circuit 140 during with the mode driving LED array 410 of previous embodiment, the framework of light-emitting device 400 can provide higher luminous efficacy.
Enforcement and function mode and associated advantages about other function square of the light-emitting device 100 among Fig. 1 also are applicable in the light-emitting device 400 of Fig. 4, for simplicity's sake, and at this repeated description not.
On the implementation, the switch arrays 130 among aforementioned each embodiment also can be incorporated in led array 110 or the led array 410.Perhaps, also switch arrays 130 can be incorporated in the drive circuit 140 of aforementioned each embodiment.In addition, deciding current regulator 151～156 and control circuit 160 and also can use other circuit with said function instead and realize in the aforementioned drive circuit 140, and be not limited to the embodiment of earlier figures 2 and Fig. 3.
In practical application, the aforesaid circuit framework of deciding current regulator 151～156 also can be applicable in other the technical field, and is not limited in the drive circuit that can only be applied in the LED module.
The above only is the present invention's preferred embodiment, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to the present invention's covering scope.
Claims (31)
1. drive circuit that be used for to drive a led array, this led array includes: one first LED matrix, one second LED matrix, one the 3rd LED matrix, one the 4th LED matrix and one first diode apparatus, wherein this second LED matrix is connected in this first LED matrix, the 4th LED matrix is connected in the 3rd LED matrix, and this first diode apparatus is connected between this second LED matrix and the 3rd LED matrix, and this drive circuit includes:
One first decides current regulator, is used for being coupled between this first LED matrix and this second LED matrix;
One second decides current regulator, is used for being coupled between this second LED matrix and the 3rd LED matrix;
One the 3rd decides current regulator, is used for being coupled between the 3rd LED matrix and the 4th LED matrix;
One the 4th decides current regulator, is used for being coupled between the 4th LED matrix and the fixed potential; And
One control circuit, be coupled to this first, this second, the 3rd and the 4th decides current regulator;
Wherein when this first, this is the second, the 3rd and the 4th when deciding input voltage that a target in the current regulator decides current regulator and surpassing the critical voltage of a correspondence, this target is decided current regulator can be according to the control of this control circuit, and the electric current of this target of flowing through being decided current regulator is cut to below the predetermined critical.
2. drive circuit as claimed in claim 1, wherein this target is decided current regulator and is included:
One the first transistor, its first end is coupled to the input voltage that this target is decided current regulator;
One transistor seconds, its first end are coupled to the second end and the control end of this first transistor;
One the 3rd transistor, its first end is coupled to the first end of this first transistor, and the 3rd transistorized control end is coupled to the first end of this transistor seconds;
One first resistance, its first end are coupled to the 3rd transistorized the second end, and the second end of this first resistance is coupled to the control end of this transistor seconds;
One second resistance, its first end is coupled to the control end of this transistor seconds, and the second end of this second resistance is coupled to the second end of this transistor seconds; And
One the 3rd resistance, its first end are coupled to the 3rd transistorized the second end, and the second end of the 3rd resistance is coupled to a fixed potential.
3. drive circuit as claimed in claim 2 when wherein this control circuit can surpass corresponding critical voltage in the input voltage that this target is decided current regulator, ends the 3rd transistor.
4. drive circuit as claimed in claim 3, wherein this control circuit includes a circuit for detecting, be coupled to this target and decide current regulator, and this circuit for detecting includes:
One the 4th transistor;
One the 3rd diode apparatus includes one or more diode element, and is coupled to the 4th transistorized first end and this target is decided between the input voltage of current regulator;
One the 5th transistor, its first end are coupled to the 3rd transistorized control end, and the 5th transistorized control end is coupled to the 4th transistorized the second end;
One the 4th resistance, its first end are coupled to the 5th transistorized control end, and the second end of the 4th resistance is coupled to the 4th transistorized control end; And
One the 5th resistance, its first end are coupled to the 5th transistorized control end, and the second end of the 5th resistance is coupled to a fixed potential;
Wherein this target is decided the breakdown voltage that critical voltage corresponding to current regulator depends on the 3rd diode apparatus.
5. drive circuit as claimed in claim 4, wherein this control circuit includes a plurality of circuit for detecting, be respectively coupled to this first, this second and the 3rd decides current regulator.
6. drive circuit as claimed in claim 5, when the temperature of wherein deciding current regulator when this target surpassed a critical temperature, this target is decided current regulator can according to the control of this control circuit, downgrade the size of current that this target of flowing through is decided current regulator.
7. drive circuit as claimed in claim 6, wherein this control circuit can be by the cross-pressure that downgrades the 3rd resistance, the size of current of deciding current regulator to downgrade this target of flowing through.
8. drive circuit as claimed in claim 7, wherein this control circuit includes a thermal-shutdown circuit, be coupled to this target and decide current regulator, and this thermal-shutdown circuit includes:
One the 6th transistor, its first end are coupled to the 3rd transistorized control end, and the 6th transistorized control end is coupled to the second end of this first resistance;
One the 7th transistor, its first end are coupled to the 3rd transistorized control end, and the 7th transistorized control end is coupled to the 6th transistorized the second end; And
One the 8th transistor, its first end are coupled to the 3rd transistorized control end, and the 8th transistorized control end is coupled to the 7th transistorized the second end.
9. drive circuit as claimed in claim 8, wherein the the 5th, the 6th and the 7th transistorized one of them is bipolar junction transistor at least.
10. drive circuit as claimed in claim 2, wherein this led array includes one first switch, be connected between the 3rd LED matrix and this first LED matrix, and when an input voltage of this led array during between one second critical voltage and the 3rd critical voltage, this control circuit can end this first switch.
11. drive circuit as claimed in claim 2, it includes in addition:
One first switch is used for being coupled between the 3rd LED matrix and this first LED matrix;
Wherein when an input voltage of this led array during between one second critical voltage and the 3rd critical voltage, this control circuit can end this first switch.
12. drive circuit as claimed in claim 1, wherein this control circuit includes a circuit for detecting, be coupled to this target and decide current regulator, and this circuit for detecting includes:
One the 4th transistor;
One the 3rd diode apparatus includes one or more diode element, is coupled to the 4th transistorized first end and this target and decides between the input voltage of current regulator;
One the 5th transistor, its first end are coupled to this target and decide current regulator, and the 5th transistorized control end is coupled to the 4th transistorized the second end;
One the 4th resistance, its first end are coupled to the 5th transistorized control end, and the second end of the 4th resistance is coupled to the 4th transistorized control end; And
One the 5th resistance, its first end are coupled to the 5th transistorized control end, and the second end of the 5th resistance is coupled to a fixed potential;
Wherein this target is decided the breakdown voltage that critical voltage corresponding to current regulator depends on the 3rd diode apparatus, and when the input voltage of deciding current regulator when this target surpasses this critical voltage, this target is decided current regulator can be according to the control of the 5th transistorized first end, and the electric current of this target of flowing through being decided current regulator is cut to this below predetermined critical.
13. drive circuit as claimed in claim 12, wherein this control circuit includes a plurality of circuit for detecting, be respectively coupled to this first, this second and the 3rd decides current regulator.
14. drive circuit as claimed in claim 13, when the temperature of wherein deciding current regulator when this target surpassed a critical temperature, this target is decided current regulator can according to the control of this control circuit, downgrade the size of current that this target of flowing through is decided current regulator.
15. drive circuit as claimed in claim 14, wherein this control circuit can be by the cross-pressure that downgrades the 3rd resistance, the size of current of deciding current regulator to downgrade this target of flowing through.
16. drive circuit as claimed in claim 15, wherein this control circuit includes a thermal-shutdown circuit, be coupled to this target and decide current regulator, and this thermal-shutdown circuit includes:
One the 6th transistor, its first end are coupled to the 3rd transistorized control end, and the 6th transistorized control end is coupled to the second end of this first resistance;
One the 7th transistor, its first end are coupled to the 3rd transistorized control end, and the 7th transistorized control end is coupled to the 6th transistorized the second end; And
One the 8th transistor, its first end are coupled to the 3rd transistorized control end, and the 8th transistorized control end is coupled to the 7th transistorized the second end.
17. drive circuit as claimed in claim 12, wherein this led array includes one first switch, be connected between the 3rd LED matrix and this first LED matrix, and when an input voltage of this led array during between one second critical voltage and the 3rd critical voltage, this control circuit can end this first switch.
18. drive circuit as claimed in claim 17, wherein this control circuit can be by the running of this first switch of control, with this first, this second, the 3rd, and the 4th LED matrix switch between configuration with connecting in configuration in parallel.
19. drive circuit as claimed in claim 12, it includes in addition:
One first switch is used for being coupled between the 3rd LED matrix and this first LED matrix;
Wherein when an input voltage of this led array during between one second critical voltage and the 3rd critical voltage, this control circuit can end this first switch.
20. drive circuit as claimed in claim 19, wherein this control circuit can be by the running of this first switch of control, with this first, this second, the 3rd, and the 4th LED matrix switch between configuration with connecting in configuration in parallel.
21. drive circuit as claimed in claim 1, wherein this led array includes one the 5th LED matrix, one the 6th LED matrix and one second diode apparatus in addition, wherein the 6th LED matrix is connected in the 5th LED matrix, and this second diode apparatus is coupled between another LED matrix in the 5th LED matrix and this led array, and this drive circuit includes in addition:
One the 5th decides current regulator, be used for being coupled between the 5th LED matrix and the 6th LED matrix, and when the 5th input voltage of deciding current regulator surpasses the 5th critical voltage, the 5th decides current regulator can be according to the control of this control circuit, and the 5th electric current of deciding current regulator is cut to this below predetermined critical with flowing through; And
One the 6th decides current regulator, be used for being coupled between the 6th LED matrix and the fixed potential, and when the 6th input voltage of deciding current regulator surpasses the 6th critical voltage, the 6th decides current regulator can be according to the control of this control circuit, and the 6th electric current of deciding current regulator is cut to this below predetermined critical with flowing through.
22. drive circuit as claimed in claim 21, wherein this led array includes one first switch and a second switch in addition, this first switch is connected between the 3rd LED matrix and this first LED matrix, and this second switch is connected between the 5th LED matrix and this first LED matrix;
Wherein when an input voltage of this led array during between one second critical voltage and the 3rd critical voltage, this control circuit can end this first switch, and when this input voltage during between one the 4th critical voltage and the 5th critical voltage, this control circuit can end this second switch.
23. drive circuit as claimed in claim 22, wherein this control circuit can be by the running of control this first switch and this second switch, with this first, this second, the 3rd, the 4th, the 5th, and the 6th LED matrix switch between configuration with connecting in configuration in parallel.
24. drive circuit as claimed in claim 21, it includes in addition:
One first switch is used for being coupled between the 3rd LED matrix and this first LED matrix; And
One second switch is used for being coupled between the 5th LED matrix and this first LED matrix;
Wherein when an input voltage of this led array during between one second critical voltage and the 3rd critical voltage, this control circuit can end this first switch, and when this input voltage during between one the 4th critical voltage and the 5th critical voltage, this control circuit can end this second switch.
25. drive circuit as claimed in claim 24, wherein this control circuit can be by the running of control this first switch and this second switch, with this first, this second, the 3rd, the 4th, the 5th, and the 6th LED matrix switch between configuration with connecting in configuration in parallel.
26. drive circuit that is used for driving a led array, this led array includes: one first LED matrix, one second LED matrix, one the 3rd LED matrix, one the 4th LED matrix, one first diode apparatus, and one first switch, wherein this second LED matrix is connected in this first LED matrix, the 4th LED matrix is connected in the 3rd LED matrix, this first diode apparatus is connected between this second LED matrix and the 3rd LED matrix, and this first switch is connected between the 3rd LED matrix and this first LED matrix, and this drive circuit includes:
One first decides current regulator, is used for being coupled between this first LED matrix and this second LED matrix;
One second decides current regulator, is used for being coupled between this second LED matrix and the 3rd LED matrix;
One the 3rd decides current regulator, is used for being coupled between the 3rd LED matrix and the 4th LED matrix;
One the 4th decides current regulator, is used for being coupled between the 4th LED matrix and the fixed potential; And
One control circuit, be coupled to this first, this second, the 3rd and the 4th decides current regulator;
Wherein when this first, this is the second, the 3rd and the 4th when deciding input voltage that a target in the current regulator decides current regulator and surpassing the critical voltage of a correspondence, this target is decided current regulator can be according to the control of this control circuit, the electric current of this target of flowing through being decided current regulator is cut to below the predetermined critical, and when an input voltage of this led array during between one second critical voltage and the 3rd critical voltage, this control circuit can end this first switch.
27. drive circuit as claimed in claim 26, wherein this control circuit can be by the running of this first switch of control, with this first, this second, the 3rd, and the 4th LED matrix switch between configuration with connecting in configuration in parallel.
28. drive circuit that is used for driving a led array, this led array includes: one first LED matrix, one second LED matrix, one the 3rd LED matrix, one the 4th LED matrix and one first diode apparatus, wherein this second LED matrix is connected in this first LED matrix, the 4th LED matrix is connected in the 3rd LED matrix, and this first diode apparatus is connected between this second LED matrix and the 3rd LED matrix, and this drive circuit includes:
One first switch is used for being coupled between the 3rd LED matrix and this first LED matrix;
One first decides current regulator, is used for being coupled between this first LED matrix and this second LED matrix;
One second decides current regulator, is used for being coupled between this second LED matrix and the 3rd LED matrix;
One the 3rd decides current regulator, is used for being coupled between the 3rd LED matrix and the 4th LED matrix;
One the 4th decides current regulator, is used for being coupled between the 4th LED matrix and the fixed potential; And
One control circuit, be coupled to this first, this second, the 3rd and the 4th decides current regulator;
Wherein when this first, this is the second, the 3rd and the 4th when deciding input voltage that a target in the current regulator decides current regulator and surpassing the critical voltage of a correspondence, this target is decided current regulator can be according to the control of this control circuit, the electric current of this target of flowing through being decided current regulator is cut to below the predetermined critical, and when an input voltage of this led array during between one second critical voltage and the 3rd critical voltage, this control circuit can end this first switch.
29. drive circuit as claimed in claim 28, wherein this control circuit can be by the running of this first switch of control, with this first, this second, the 3rd, and the 4th LED matrix switch between configuration with connecting in configuration in parallel.
30. decide current regulator, include for one kind:
One the first transistor, its first end is coupled to an input voltage;
One transistor seconds, its first end are coupled to the second end and the control end of this first transistor;
One the 3rd transistor, its first end is coupled to the first end of this first transistor, and the 3rd transistorized control end is coupled to the first end of this transistor seconds;
One first resistance, its first end are coupled to the 3rd transistorized the second end, and the second end of this first resistance is coupled to the control end of this transistor seconds;
One second resistance, its first end is coupled to the control end of this transistor seconds, and the second end of this second resistance is coupled to the second end of this transistor seconds; And
One the 3rd resistance, its first end are coupled to the 3rd transistorized the second end, and the second end of the 3rd resistance is coupled to a fixed potential.
31. as claimed in claim 30ly decide current regulator, wherein this first transistor is a junction field effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210112443.0A CN103379695B (en) | 2012-04-17 | 2012-04-17 | Driving circuit capable of improving utilization rate of LED apparatus, and relative constant current regulator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210112443.0A CN103379695B (en) | 2012-04-17 | 2012-04-17 | Driving circuit capable of improving utilization rate of LED apparatus, and relative constant current regulator |
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| CN103379695B CN103379695B (en) | 2015-03-25 |
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|---|---|---|---|---|
| US5233180A (en) * | 1990-08-30 | 1993-08-03 | Fuji Electric Co., Ltd. | Light sensor having an integration circuit |
| CN101916547A (en) * | 2010-07-14 | 2010-12-15 | 成都芯源系统有限公司 | Driver for driving a plurality of light emitting elements and display device |
| CN102202441A (en) * | 2010-03-23 | 2011-09-28 | 陕西西电科大华成电子股份有限公司 | Constant-current controller topology circuit powered directly by alternating current power supply for LED lighting lamp |
| CN102209415A (en) * | 2011-05-30 | 2011-10-05 | 桂林源通网络软件有限公司朝阳路分公司 | Light emitting diode (LED) alternating-current direct power supply circuit |
| CN102256421A (en) * | 2011-07-28 | 2011-11-23 | 林万炯 | High-precision multipath LED (light-emitting diode) current-equalizing circuit |
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2012
- 2012-04-17 CN CN201210112443.0A patent/CN103379695B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5233180A (en) * | 1990-08-30 | 1993-08-03 | Fuji Electric Co., Ltd. | Light sensor having an integration circuit |
| CN102202441A (en) * | 2010-03-23 | 2011-09-28 | 陕西西电科大华成电子股份有限公司 | Constant-current controller topology circuit powered directly by alternating current power supply for LED lighting lamp |
| CN101916547A (en) * | 2010-07-14 | 2010-12-15 | 成都芯源系统有限公司 | Driver for driving a plurality of light emitting elements and display device |
| CN102209415A (en) * | 2011-05-30 | 2011-10-05 | 桂林源通网络软件有限公司朝阳路分公司 | Light emitting diode (LED) alternating-current direct power supply circuit |
| CN102256421A (en) * | 2011-07-28 | 2011-11-23 | 林万炯 | High-precision multipath LED (light-emitting diode) current-equalizing circuit |
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