CN103379695B - 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 driving circuit of the present invention, espespecially a kind of improve LED matrix luminescence efficiency driving circuit and relevant determine current regulator.
Background technology
The electric power that many use LED matrix need rely on AC power provide as the Conventional luminescent device of light source carrys out driving LED device, so often can arrange electrochemical capacitor on voltage input path, to promote the luminescence efficiency of LED matrix.But the wear life of electrochemical capacitor is usually short compared with LED matrix.Once electrochemical capacitor breaks down, traditional light-emitting device just cannot normal operation.Clearly, electrochemical capacitor is set in light-emitting device and not only can causes harmful effect to the power factor of light-emitting device, also can reduce fiduciary level (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 fiduciary level of light-emitting device, and improve the utilization rate of the LED matrix in light-emitting device simultaneously, in fact for industry has problem to be solved.
Present description provides a kind of for driving the embodiment of the driving circuit of 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 to this first LED matrix, 4th LED matrix is connected to the 3rd LED matrix, and this first diode apparatus is connected between this second LED matrix and the 3rd LED matrix.This driving circuit includes: one first determines current regulator, for being coupled between this first LED matrix and this second LED matrix; One second determines current regulator, for being coupled between this second LED matrix and the 3rd LED matrix; One the 3rd determines current regulator, for being coupled between the 3rd LED matrix and the 4th LED matrix; One the 4th determines current regulator, for being coupled between the 4th LED matrix and a set potential; And a control circuit, be coupled to this first, this second, the 3rd and the 4th determines current regulator; Wherein when this first, the critical voltage of this second, the 3rd and the 4th input voltage determining the target constant current regulator in current regulator more than a correspondence time, the electric current flowing through this target constant current regulator according to the control of this control circuit, can be cut to a below predetermined critical by this target constant current regulator.
This instructions separately provides a kind of for driving the embodiment of the driving circuit of 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 to this first LED matrix, 4th LED matrix is connected to 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 driving circuit includes: one first determines current regulator, for being coupled between this first LED matrix and this second LED matrix; One second determines current regulator, for being coupled between this second LED matrix and the 3rd LED matrix; One the 3rd determines current regulator, for being coupled between the 3rd LED matrix and the 4th LED matrix; One the 4th determines current regulator, for being coupled between the 4th LED matrix and a set potential; And a control circuit, be coupled to this first, this second, the 3rd and the 4th determines current regulator; Wherein when this first, the critical voltage of this second, the 3rd and the 4th input voltage determining the target constant current regulator in current regulator more than a correspondence time, this target constant current regulator can according to the control of this control circuit, the electric current flowing through this target constant current regulator is cut to a below predetermined critical, and when an input voltage of this LED array is between one second critical voltage and the 3rd critical voltage, this control circuit can end this first switch.
This instructions separately provides a kind of for driving the embodiment of the driving circuit of 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 to this first LED matrix, 4th LED matrix is connected to the 3rd LED matrix, and this first diode apparatus is connected between this second LED matrix and the 3rd LED matrix.This driving circuit includes: one first switch, for being coupled between the 3rd LED matrix and this first LED matrix; One first determines current regulator, for being coupled between this first LED matrix and this second LED matrix; One second determines current regulator, for being coupled between this second LED matrix and the 3rd LED matrix; One the 3rd determines current regulator, for being coupled between the 3rd LED matrix and the 4th LED matrix; One the 4th determines current regulator, for being coupled between the 4th LED matrix and a set potential; And a control circuit, be coupled to this first, this second, the 3rd and the 4th determines current regulator; Wherein when this first, the critical voltage of this second, the 3rd and the 4th input voltage determining the target constant current regulator in current regulator more than a correspondence time, this target constant current regulator can according to the control of this control circuit, the electric current flowing through this target constant current regulator is cut to a below predetermined critical, and when an input voltage of this LED array is between one second critical voltage and the 3rd critical voltage, this control circuit can end this first switch.
One of advantage of above-mentioned driving circuit is the utilization rate significantly improving the LED matrix of LED array, promotes LED array luminous efficacy.
Another advantage of above-mentioned driving circuit, is have benefiting of front to the wear life extending LED matrix, also can reduces the situation that flicker occurs LED matrix.
This instructions separately provides one and determines current regulator, and include: a first transistor, its first end is coupled to an input voltage; One transistor seconds, its first end is coupled to the second end and the control end of this first transistor; One third transistor, its first end is coupled to the first end of this first transistor, and the control end of this third transistor is coupled to the first end of this transistor seconds; One first resistance, its first end is coupled to the second end of this third transistor, 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 second end of this third transistor, and the second end of the 3rd resistance is coupled to a set potential.
Other advantage of the present invention will explain orally in more detail by the following description and accompanying drawing.
Accompanying drawing explanation
Fig. 1 is the functional block diagram after an embodiment of the light-emitting device of the present invention simplifies.
Fig. 2 is the local function calcspar after an embodiment of driving circuit in Fig. 1 simplifies.
Fig. 3 is the local function calcspar after another embodiment of driving circuit in Fig. 1 simplifies.
Fig. 4 is the functional block diagram after another embodiment of the light-emitting device of the present invention simplifies.
Embodiment
Below cooperation correlative type is illustrated the embodiment of the present invention.In these are graphic, identical label represents same or similar element or process step.
Some vocabulary is employed to censure specific element in the middle of instructions and follow-up claim.Person of ordinary skill in the field should understand, and same element may be called with different nouns.This instructions and follow-up claim are not used as the mode of distinguish one element from another with the difference of title, but are used as the benchmark of differentiation with element difference functionally." comprising " mentioned in the middle of instructions and follow-up claim is in the whole text an open term, thus " comprise but be not limited to ... " should be construed toIn addition, " couple " word comprise directly any at this and indirectly connect means.Therefore, if describe one first element in literary composition to be coupled to one second element, then represent this first element and directly (comprise by be electrically connected or the signal such as wireless transmission, optical delivery connected mode) this second element can be connected to, or by other element or connection means indirectly electrically or signal be connected to this second element.
Used herein " and/or " describing mode, comprise the combination in any of cited one of them or multiple project.In addition, unless specialized in this instructions, otherwise the term of any odd number lattice comprises the connotation of plural lattice all simultaneously.
Fig. 1 is the functional block diagram after the light-emitting device 100 of one embodiment of the invention simplifies.Light-emitting device 100 includes AC power 102, bridge rectifier 104, LED array 110, switch arrays 130 and driving circuit 140.Bridge rectifier 104 is rectified into the input voltage vin of m shape ripple for alternating voltage Vac AC power 102 provided, to be supplied to LED array 110.Switch arrays 130 and driving circuit 140 are all coupled to LED array 110.
Include multiple LED matrix and one or more diode apparatus in LED array 110, in switch arrays 130, then include one or more switch.Such as, in the embodiment in figure 1, LED array 110 includes the first LED matrix 111, second LED matrix 112, the 3rd LED matrix 113, the 4th LED matrix 114, the 5th LED matrix 115, the 6th LED matrix 116, first diode apparatus 121 and the second diode apparatus 122.LED matrix 112 is connected to LED matrix 111.LED matrix 114 is connected to LED matrix 113.LED matrix 116 is connected to LED matrix 115.Diode apparatus 121 is connected between LED matrix 112 and LED matrix 113.Diode apparatus 122 is coupled between another LED matrix in LED matrix 115 and LED array 110.Such as, if only have six LED matrix 111 ~ 116 in LED array 110, then diode apparatus 122 can be connected between LED matrix 115 and LED matrix 114.In LED array 110, each LED matrix all can realize by one or more LED element, and each diode apparatus all can realize with one or more diode element.
In the embodiment in figure 1, switch arrays 130 include the first switch 131 in parallel and second switch 132.Switch 131 is connected between LED matrix 113 and LED matrix 111.132, switch is connected between LED matrix 115 and LED matrix 111.
When operating, driving circuit 140 can by the running of each switch in gauge tap array 130, dynamically adjust the current path configuration of the LED matrix 111 ~ 116 in LED array 110, LED matrix 111 ~ 116 to be switched between configuration in parallel and series configuration.Such framework effectively can promote the utilization rate of these LED matrix, and then improves the illumination effect of LED array 110.
In the embodiment in figure 1, driving circuit 140 includes first and determines current regulator (constantcurrent regulator) 151, second and determine current regulator 152, the 3rd and determine current regulator 153, the 4th and determine current regulator 154, the 5th and determine current regulator 155, the 6th and determine current regulator 156 and control circuit 160.Determine current regulator 151 for being coupled between LED matrix 111 and LED matrix 112.Determine current regulator 152 for being coupled between LED matrix 112 and LED matrix 113.Determine current regulator 153 for being coupled between LED matrix 113 and LED matrix 114.Determine current regulator 154 for being coupled between LED matrix 114 and a set potential (such as earth terminal).Determine current regulator 155 for being coupled between LED matrix 115 and LED matrix 116.Determine current regulator 156 for being coupled between LED matrix 116 and a set potential (such as earth terminal).
For ease of describing, in this instructions and follow-up claim with " target constant current regulator " one word call and determine one in current regulator 151 ~ 156 and specific do not determine current regulator.When the critical voltage that the input voltage determining the target constant current regulator in current regulator 151 ~ 156 is corresponding more than, this target constant current regulator can according to the control of control circuit 160, the electric current flowing through this target constant current regulator is cut to below predetermined critical, such as, drops to 0.In one embodiment, when the input voltage V1 determining current regulator 151 is more than the first critical voltage Vb1, determining current regulator 151 according to the control of control circuit 160, can be cut to below predetermined critical by flowing through the current i 1 of determining current regulator 151.When the input voltage V2 determining current regulator 152 is more than the second critical voltage Vb2, determining current regulator 152 according to the control of control circuit 160, can be cut to below predetermined critical by flowing through the current i 2 of determining current regulator 152.When the input voltage V3 determining current regulator 153 is more than the 3rd critical voltage Vb3, determining current regulator 153 according to the control of control circuit 160, can be cut to below predetermined critical by flowing through the current i 3 of determining current regulator 153.When the input voltage V4 determining current regulator 154 is more than the 4th critical voltage Vb4, determining current regulator 154 according to the control of control circuit 160, can be cut to below predetermined critical by flowing through the current i 4 of determining current regulator 154.When the input voltage V5 determining current regulator 155 is more than the 5th critical voltage Vb5, determining current regulator 155 according to the control of control circuit 160, can be cut to below predetermined critical by flowing through the current i 5 of determining current regulator 155.When the input voltage V6 determining current regulator 156 is more than the 6th critical voltage Vb6, determining current regulator 156 according to the control of control circuit 160, can be cut to below predetermined critical by flowing through the current i 6 of determining current regulator 156.The relative size relation of aforesaid critical voltage Vb1 ~ Vb6 is Vb6>Vb5>Vb4>VB 3>VB2>Vb1.
Fig. 2 illustrate into the driving circuit 140 in Fig. 1 one embodiment simplify after local function calcspar.For convenience of description, in fig. 2 only to determine current regulator 151 so that each embodiment determining current regulator in driving circuit 140 to be described.
In the present embodiment, determine current regulator 151 and include the first transistor 211, transistor seconds 212, third transistor 213, first resistance 214, second resistance 215 and the 3rd resistance 216.The first end of transistor 211 is coupled to the input voltage V1 determining 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 set potential.
In the present embodiment, the control circuit 160 of driving circuit 140 includes organizes circuit for detecting more, is respectively coupled to determine current regulator 151 ~ 156 in driving circuit 140, is used for detecting and determines current regulator 151 ~ 156 other input voltages.As shown in Figure 2, the circuit for detecting 220 being used for controlling to determine current regulator 151 in control circuit 160 includes the 4th transistor 221, the 3rd diode apparatus 222, the 5th transistor 223, the 4th resistance 224 and the 5th resistance 225.Diode apparatus 222 includes one or more diode element, and is coupled between the first end of transistor 221 and the input voltage V1 determining current regulator 151.The first end of transistor 223 is coupled to the control end of the transistor 213 determined in 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 set potential.The critical voltage Vb1 determining current regulator 151 depends on the disruptive voltage of diode apparatus 222.
In implementation, the transistor 212 and 213 determined in current regulator 151 can realize with the transistor of same-type, also can realize with dissimilar transistor respectively.Similarly, the transistor 221 and 223 in circuit for detecting 220 can realize with the transistor of same-type, also can realize with dissimilar transistor respectively.Such as, in one embodiment, transistor 221 in circuit for detecting 220 and the transistor 211 determined in current regulator 151 can utilize junction field effect transistor (JFET) to realize, and circuit for detecting 220 and other transistor determined in current regulator 151 then available metal-oxide-semiconductor (MOS) (MOS) transistor realize.
When the input voltage V1 determining current regulator 151 is less than the disruptive voltage of diode apparatus 222, the second end of the transistor 221 in circuit for detecting 220 can be in electronegative potential.Now, transistor 223 can be in cut-off (turn off) state, and flowing through the current i 1 of determining current regulator 151 is then remain fixing haply.
When the input voltage V1 determining current regulator 151 is greater than the disruptive voltage of diode apparatus 222, input voltage V1 can run through diode apparatus 222, make the second end-grain cutting of transistor 221 change to noble potential conducting (turn on) transistor 223, and and then end the transistor 213 determined in current regulator 151.Now, flow through the current i 1 of determining current regulator 151 and can reduce to 0.In implementation, all can be designed to determine the identical circuit structure of current regulator 151 with aforementioned, to simplify the complexity on control circui by determining current regulator 152 ~ 156.
Similarly, can be used for controlling to determine other circuit for detecting of current regulator 152 ~ 156 in control circuit 160, all be designed to the framework identical with aforementioned circuit for detecting 220.Because the critical voltage determining current regulator 151 ~ 156 is not identical, so the diode apparatus in other circuit for detecting also will do corresponding adjustment, can match with the corresponding critical voltage determining current regulator to make the disruptive voltage of diode apparatus.Such as, because the critical voltage Vb2 determining current regulator 152 is greater than the critical voltage Vb1 determining current regulator 151, so the disruptive voltage determining the diode apparatus in the circuit for detecting corresponding to current regulator 152 is also greater than the disruptive voltage of aforementioned diodes device 222.Again such as, because the critical voltage Vb6 determining current regulator 156 is greater than the critical voltage Vb5 determining current regulator 155, so determine the disruptive voltage of the diode apparatus in the circuit for detecting corresponding to current regulator 156, be also greater than the disruptive voltage of the diode apparatus in the circuit for detecting determined corresponding to current regulator 155.
Illustrate about the circuit determined between current regulator 151 and circuit for detecting 220 in Fig. 2 operates, be also applicable to determine current regulator 152 ~ 156 and other corresponding separately circuit for detecting, for simplicity's sake, at this not repeated description.
In certain embodiments, also only in control circuit 160, corresponding multiple circuit for detecting can be set respectively for determining current regulator 151 ~ 155, and omit the circuit for detecting being used for controlling to determine current regulator 156, to save circuit area.
As previously mentioned, driving circuit 140 can by the running of each switch in gauge tap array 130, dynamically adjust the current path configuration of the LED matrix 111 ~ 116 in LED array 110, LED matrix 111 ~ 116 to be switched between configuration in parallel and series configuration.For convenience of description, below suppose that 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 is greater than VF but is less than the critical voltage Vb1 determining current regulator 151, switch 131 in control circuit 160 meeting actuating switch array 130 in driving circuit 140 and switch 132, the electric current that bridge rectifier 104 is exported can flow to via LED matrix 111 determines current regulator 151, also can flow to via LED matrix 113 and determine current regulator 153, also can flow to via LED matrix 115 simultaneously and determine current regulator 155.Now, LED matrix 111,113 and 115 can be luminous, and three can form configuration in parallel.
When the input voltage vin of LED array 110 is greater than 2VF but is less than the critical voltage Vb2 determining current regulator 152, determining current regulator 151 can according to the control of control circuit 160, be cut to 0 by flowing through the current i 1 of determining current regulator 151, and control circuit 160 can switch 131 in actuating switch array 130 and switch 132.Thus, the electric current that bridge rectifier 104 exports can flow to via LED matrix 111 and 112 determines current regulator 152, also can flow to via LED matrix 113 and 114 and determine current regulator 154, also can flow to via LED matrix 115 and 116 simultaneously and determine current regulator 156.Now, LED matrix 111 ~ 116 all can be luminous, and the LED strip row that LED matrix 111 and 112 forms, the LED strip row that meeting and LED matrix 113 and 114 form form configuration in parallel, also can form configuration in parallel with the LED strip row of LED matrix 115 and 116 composition simultaneously.
When the input voltage vin of LED array 110 is greater than 3VF+VFD but is less than the critical voltage Vb3 determining current regulator 153, determine current regulator 151 and current i 1 can be cut to 0, determine current regulator 152 and also current i 2 can be cut to 0, and the switch 132 also cutoff switch 131 in control circuit 160 meeting actuating switch array 130, wherein 3VF+VFD can be greater than the critical voltage Vb2 determining current regulator 152.Thus, the electric current that bridge rectifier 104 exports can flow to via LED matrix 111,112 and 113 determines current regulator 153, also can flow to via LED matrix 115 and 116 and determine current regulator 156.Now, LED matrix 111 ~ 113,115 and 116 all can be luminous, and the LED strip row that LED matrix 111 ~ 113 forms, the LED strip row that meeting and LED matrix 115 and 116 form form configuration in parallel.
When the input voltage vin of LED array 110 is greater than 4VF+VFD but is less than the critical voltage Vb4 determining current regulator 154, determine current regulator 151 and current i 1 can be cut to 0, determine current regulator 152 and current i 2 can be cut to 0, determine current regulator 153 and also current i 3 can be cut to 0, and the switch 132 also cutoff switch 131 in control circuit 160 meeting actuating switch array 130, wherein 4VF+VFD can be greater than the critical voltage Vb3 determining current regulator 153.Thus, the electric current that bridge rectifier 104 exports can flow to via LED matrix 111,112,113 and 114 determines current regulator 154, also can flow to via LED matrix 115 and 116 and determine current regulator 156.Now, LED matrix 111 ~ 116 all can be luminous, and the LED strip row that LED matrix 111 ~ 114 forms, the LED strip row that meeting and LED matrix 115 and 116 form form configuration in parallel.
When the input voltage vin of LED array 110 is greater than 5VF+2VFD but is less than the critical voltage Vb5 determining current regulator 155, determine current regulator 151 and current i 1 can be cut to 0, determine current regulator 152 and current i 2 can be cut to 0, determine current regulator 153 and current i 3 can be cut to 0, determine current regulator 154 and also current i 4 can be cut to 0, and control circuit 160 can switch 131 in cutoff switch array 130 and switch 132, wherein 5VF+2VFD can be greater than the critical voltage Vb4 determining current regulator 154.Thus, the electric current that bridge rectifier 104 exports can flow to via LED matrix 111,112,113,114 and 115 determines current regulator 155.Now, LED matrix 111 ~ 115 can be luminous, and can form tandem configuration.
When the input voltage vin of LED array 110 is greater than 6VF+2VFD but is less than the critical voltage Vb6 determining current regulator 156, determining current regulator 151 ~ 155 can be cut to 0 by current i 1 ~ i5, and control circuit 160 can switch 131 in cutoff switch array 130 and switch 132.Thus, the electric current that bridge rectifier 104 exports can flow to via LED matrix 111,112,113,114,115 and 116 determines current regulator 156.Now, LED matrix 111 ~ 116 all can be luminous, and can form tandem configuration.
When the input voltage vin of LED array 110 reduces gradually, driving circuit 140 can be reversed aforesaid operation workflow.
From aforementioned explanation, when the input voltage vin of LED array 110 is between VF ~ 2VF, driving circuit 140 with regard to can in driving LED array 110 at least the LED matrix of half carry out luminescence, but not single LED matrix can only be driven.When the input voltage vin of LED array 110 is between 2VF ~ 3VF, driving circuit 140 carries out luminescence with regard to the whole LED matrix in energy driving LED array 110, but not can only drive 2 LED matrix.When the input voltage vin of LED array 110 is between 3VF ~ 4VF, driving circuit 140 carries out luminescence with regard to 4 LED matrix in energy driving LED array 110, but not can only drive 3 LED matrix.When the input voltage vin of LED array 110 is between 4VF ~ 5VF, driving circuit 140 carries out luminescence with regard to the whole LED matrix in energy driving LED array 110, but not can only drive 4 LED matrix.
Clearly, the framework of aforementioned driving circuit 140 significantly can improve the utilization rate of the LED matrix in LED array 110, making LED array 110 when using the LED matrix of same quantity, having more superior illumination effect than the framework of other correlation technique.
In addition, as shown in Figure 1, between bridge rectifier 104 and LED array 110, any electrochemical capacitor is not set.And the electric current flowing through LED matrix is maintained stable mechanism by the aforementioned driving circuit 140 that utilizes, there is benefiting of front to the wear life extending LED matrix, also can reduce the situation that flicker occurs LED matrix.Therefore, it is higher than using the Conventional luminescent device of electrochemical capacitor not only can to make the power factor of light-emitting device 100, and wear life and fiduciary level also can be more desirable.
As previously mentioned, include in some embodiment of the corresponding circuit for detecting for controlling to determine current regulator 156 at control circuit 160, when the input voltage V6 determining current regulator 156 rises above critical voltage Vb6, determining current regulator 156 just can according to the control of the circuit for detecting of correspondence, and will flow through and determine current regulator 156 current i 6 and be cut to 0.Now, the control circuit 160 be equivalent in driving circuit 140 provides the function of whole LED array 110 being carried out to overvoltage protection (over voltage protection).
In certain embodiments, when the temperature of determining the target constant current regulator in current regulator 151 ~ 156 is more than a critical temperature, this target constant current regulator according to the control of control circuit 160, can downgrade the size of current flowing through this target constant current regulator.
Such as, Fig. 3 illustrate into the driving circuit 140 in Fig. 1 another embodiment simplify after local function calcspar.Driving circuit 140 in Fig. 3 is very similar with the embodiment of earlier figures 2; difference is that the control circuit 160 in Fig. 3 separately includes many group thermal-shutdown circuits 320; being respectively coupled to and determining current regulator 151 ~ 156 in driving circuit 140, being used for providing for determining current regulator 151 ~ 156 mechanism of over-temperature protection.
As shown in Figure 3, the thermal-shutdown circuit 320 determining current regulator 151 is used for protecting to include the 6th transistor 321, the 7th transistor 322 and the 8th transistor 323 in control circuit 160.The first end of transistor 321 is coupled to the control end of the transistor 213 determined in 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 is below predetermined critical temperature, the cross-pressure determining the resistance 216 in current regulator 151 is determined by the voltage of the control end of transistor 212.Along with the rising gradually of circuit temperature, the voltage drop amplitude of the control end of the transistor 321 in thermal-shutdown circuit 320, can be greater than the voltage drop amplitude of the control end of the transistor 212 determined in current regulator 151.Therefore, when circuit temperature rises above predetermined critical temperature, the cross-pressure determining the resistance 216 in current regulator 151 can change and determined by the voltage of the control end of the transistor 321 in thermal-shutdown circuit 320.Thus, the cross-pressure of resistance 216 can be dragged down gradually, makes to flow through the current i 1 of determining current regulator 151 and also and then reduces gradually, and reach the function of over-temperature protection.In implementation, the transistor 321 ~ 323 in thermal-shutdown circuit 320 at least one of them or all, available bipolar junction transistor (BJT) realizes.
In implementation, can will be used for protecting other thermal-shutdown circuit determining current regulator 152 ~ 156 in control circuit 160, all be designed to the framework identical with aforementioned thermal-shutdown circuit 320.Illustrate about the circuit determined between current regulator 151 and thermal-shutdown circuit 320 in Fig. 3 operates, be also applicable to determine current regulator 152 ~ 156 and other corresponding separately thermal-shutdown circuit, for simplicity's sake, at this not repeated description.
In addition, also only can determine current regulator for the part of determining in current regulator 151 ~ 156 and corresponding thermal-shutdown circuit is set, to save circuit area.Such as, only can arrange in control circuit 160 and be used for protecting the corresponding thermal-shutdown circuit determining current regulator 156, and not for other current regulator 151 ~ 155 of determining arranges corresponding thermal-shutdown circuit.
Fig. 4 is the functional block diagram after the light-emitting device 400 of another embodiment of the present invention simplifies.Light-emitting device 400 is very similar with the light-emitting device 100 in Fig. 1, and difference is to replace the diode apparatus 121 and 122 in Fig. 1 with LED matrix 421 and 422 in the LED array 410 of light-emitting device 400.In implementation, LED matrix 421 and 422 can realize by one or more LED element.Because LED matrix 421 and 422 also has lighting function, therefore, when the mode driving LED array 410 of driving circuit 140 with previous embodiment, the framework of light-emitting device 400 can provide higher luminous efficacy.
About the enforcement of other function block of the light-emitting device 100 in Fig. 1 and function mode and associated advantages, be also applicable in the light-emitting device 400 of Fig. 4, for simplicity's sake, at this not repeated description.
In implementation, the switch arrays 130 in foregoing embodiments also can be incorporated in LED array 110 or LED array 410.Or, also switch arrays 130 can be incorporated in the driving circuit 140 of foregoing embodiments.In addition, determining current regulator 151 ~ 156 and control circuit 160 and also can use other circuit with said function instead and realize in aforementioned driving circuit 140, and be not limited to the embodiment of earlier figures 2 and Fig. 3.
In practical application, the aforesaid circuit framework determining current regulator 151 ~ 156 also can be applicable in other technical field, and is not limited in the driving circuit that can only be applied in LED module.
The foregoing is only the preferred embodiment of the present invention, all equalizations done according to the claims in the present invention change and modify, and all should belong to the covering scope of the present invention.
Claims (22)
1. one kind for driving the driving circuit of 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 to this first LED matrix, 4th LED matrix is connected to 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, this driving circuit includes:
One first determines current regulator, for being coupled between this first LED matrix and this second LED matrix;
One second determines current regulator, for being coupled between this second LED matrix and the 3rd LED matrix;
One the 3rd determines current regulator, for being coupled between the 3rd LED matrix and the 4th LED matrix;
One the 4th determines current regulator, for being coupled between the 4th LED matrix and a set potential; And
One control circuit, be coupled to this first, this second, the 3rd and the 4th determines current regulator;
Wherein when this first, the critical voltage of this second, the 3rd and the 4th input voltage determining the target constant current regulator in current regulator more than a correspondence time, this target constant current regulator can according to the control of this control circuit, the electric current flowing through this target constant current regulator is cut to a below predetermined critical, and when an input voltage of this LED array is between one second critical voltage and the 3rd critical voltage, this control circuit can end this first switch.
2. driving circuit as claimed in claim 1, wherein this target constant current regulator includes:
One the first transistor, its first end is coupled to the input voltage of this target constant current regulator;
One transistor seconds, its first end is coupled to the second end and the control end of this first transistor;
One third transistor, its first end is coupled to the first end of this first transistor, and the control end of this third transistor is coupled to the first end of this transistor seconds;
One first resistance, its first end is coupled to the second end of this third transistor, 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 second end of this third transistor, and the second end of the 3rd resistance is coupled to a set potential.
3. driving circuit as claimed in claim 2, wherein this control circuit when the input voltage of this target constant current regulator exceedes corresponding critical voltage, can end this third transistor.
4. driving circuit as claimed in claim 3, wherein this control circuit includes a circuit for detecting, is coupled to this target constant current regulator, and this circuit for detecting includes:
One the 4th transistor;
One the 3rd diode apparatus, includes one or more diode element, and between the first end being coupled to the 4th transistor and the input voltage of this target constant current regulator;
One the 5th transistor, its first end is coupled to the control end of this third transistor, and the control end of the 5th transistor is coupled to the second end of the 4th transistor;
One the 4th resistance, its first end is coupled to the control end of the 5th transistor, and the second end of the 4th resistance is coupled to the control end of the 4th transistor; And
One the 5th resistance, its first end is coupled to the control end of the 5th transistor, and the second end of the 5th resistance is coupled to a set potential;
The critical voltage that wherein this target constant current regulator is corresponding depends on the disruptive voltage of the 3rd diode apparatus.
5. driving circuit as claimed in claim 4, wherein this control circuit includes multiple circuit for detecting, be respectively coupled to this first, this second and the 3rd determines current regulator.
6. driving circuit as claimed in claim 5, wherein when the temperature of this target constant current regulator is more than a critical temperature, this target constant current regulator according to the control of this control circuit, can downgrade the size of current flowing through this target constant current regulator.
7. driving circuit as claimed in claim 6, wherein this control circuit can by the cross-pressure downgrading the 3rd resistance, to downgrade the size of current flowing through this target constant current regulator.
8. driving circuit as claimed in claim 7, wherein this control circuit includes a thermal-shutdown circuit, is coupled to this target constant current regulator, and this thermal-shutdown circuit includes:
One the 6th transistor, its first end is coupled to the control end of this third transistor, and the control end of the 6th transistor is coupled to the second end of this first resistance;
One the 7th transistor, its first end is coupled to the control end of this third transistor, and the control end of the 7th transistor is coupled to the second end of the 6th transistor; And
One the 8th transistor, its first end is coupled to the control end of this third transistor, and the control end of the 8th transistor is coupled to the second end of the 7th transistor.
9. driving circuit as claimed in claim 8, wherein the 6th, the 7th and the 8th transistor at least one of them is bipolar junction transistor.
10. driving circuit as claimed in claim 2, wherein this control circuit can by the running controlling this first switch, by this first, this second, the 3rd and the 4th LED matrix switches between configuration in parallel and series configuration.
11. driving circuits as claimed in claim 2, wherein this first switch is contained in this driving circuit.
12. driving circuits as claimed in claim 1, wherein this control circuit includes a circuit for detecting, is coupled to this target constant current regulator, and this circuit for detecting includes:
One the 4th transistor;
One the 3rd diode apparatus, includes one or more diode element, between the first end being coupled to the 4th transistor and the input voltage of this target constant current regulator;
One the 5th transistor, its first end is coupled to this target constant current regulator, and the control end of the 5th transistor is coupled to the second end of the 4th transistor;
One the 4th resistance, its first end is coupled to the control end of the 5th transistor, and the second end of the 4th resistance is coupled to the control end of the 4th transistor; And
One the 5th resistance, its first end is coupled to the control end of the 5th transistor, and the second end of the 5th resistance is coupled to a set potential;
The critical voltage that wherein this target constant current regulator is corresponding depends on the disruptive voltage of the 3rd diode apparatus, and when the input voltage of this target constant current regulator exceedes this critical voltage, the electric current flowing through this target constant current regulator according to the control of the first end of the 5th transistor, can be cut to below this predetermined critical by this target constant current regulator.
13. driving circuits as claimed in claim 12, wherein this control circuit includes multiple circuit for detecting, be respectively coupled to this first, this second and the 3rd determines current regulator.
14. driving circuits as claimed in claim 13, wherein when the temperature of this target constant current regulator is more than a critical temperature, this target constant current regulator according to the control of this control circuit, can downgrade the size of current flowing through this target constant current regulator.
15. driving circuits as claimed in claim 12, wherein this control circuit can by controlling the running of this first switch, by this first, this second, the 3rd and the 4th LED matrix switches between configuration in parallel and series configuration.
16. driving circuits as claimed in claim 12, wherein this first switch is contained in this driving circuit.
17. driving circuits as claimed in claim 16, wherein this control circuit can by controlling the running of this first switch, by this first, this second, the 3rd and the 4th LED matrix switches between configuration in parallel and series configuration.
18. driving circuits as claimed in claim 1, wherein this LED array separately includes one the 5th LED matrix, one the 6th LED matrix and one second diode apparatus, wherein the 6th LED matrix is connected to 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 driving circuit separately includes:
One the 5th determines current regulator, for being coupled between the 5th LED matrix and the 6th LED matrix, and when the 5th input voltage determining current regulator is more than one during the 5th critical voltage, 5th determines current regulator according to the control of this control circuit, can be cut to below this predetermined critical by flowing through the 5th electric current determining current regulator; And
One the 6th determines current regulator, for being coupled between the 6th LED matrix and a set potential, and when the 6th input voltage determining current regulator is more than one during the 6th critical voltage, 6th determines current regulator according to the control of this control circuit, can be cut to below this predetermined critical by flowing through the 6th electric current determining current regulator.
19. driving circuits as claimed in claim 18, wherein this LED array separately includes a second switch, and this second switch is connected between the 5th LED matrix and this first LED matrix;
Wherein when this input voltage is between one the 4th critical voltage and the 5th critical voltage, this control circuit can end this second switch.
20. driving circuits as claimed in claim 19, wherein this control circuit can by the running controlling this first switch and this second switch, by this first, this second, the 3rd, the 4th, the 5th and the 6th LED matrix switches between configuration in parallel and series configuration.
21. driving circuits as claimed in claim 18, it separately includes:
One second switch, for being coupled between the 5th LED matrix and this first LED matrix;
Wherein when this input voltage is between one the 4th critical voltage and the 5th critical voltage, this control circuit can end this second switch.
22. driving circuits as claimed in claim 21, wherein this control circuit can by the running controlling this first switch and this second switch, by this first, this second, the 3rd, the 4th, the 5th and the 6th LED matrix switches between configuration in parallel and series configuration.
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 |
Applications Claiming Priority (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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| Publication Number | Publication Date |
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| CN103379695A CN103379695A (en) | 2013-10-30 |
| CN103379695B true CN103379695B (en) | 2015-03-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210112443.0A Expired - Fee Related 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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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 |
| 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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| CN103379695A (en) | 2013-10-30 |
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