CN204906820U - Automatic constant current drive device and LED lamps and lanterns of balanced LED lamp cross luma degree - Google Patents
Automatic constant current drive device and LED lamps and lanterns of balanced LED lamp cross luma degree Download PDFInfo
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- CN204906820U CN204906820U CN201520685342.1U CN201520685342U CN204906820U CN 204906820 U CN204906820 U CN 204906820U CN 201520685342 U CN201520685342 U CN 201520685342U CN 204906820 U CN204906820 U CN 204906820U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model discloses an automatic constant current drive device and LED lamps and lanterns of balanced LED lamp cross luma degree, wherein, drive arrangement includes rectifier module, a N LED lamp cluster, a N switch module, tail current source module, detection module and intensity balancing control module. Through intensity balancing control module, in a commutating period, received an excessive pressure signal and just lighted a LED lamp cluster, after receiving N excessive pressure signal in succession, a N LED lamp cluster is all lighted, receiving once under -voltage signal, and just extinguishing a LED lamp cluster, after receiving the under -voltage signal of N in succession, a N LED lamp cluster all extinguishes, in a commutating period, the equal difference of duration that every LED lamp cluster was lighted, in a N commutating period, the total time that every LED lamp cluster was lighted is the same. From this, the luminance and the life of each LED lamp cluster are just also the same, have realized the purpose of automatic equalization LED lamp cross luma degree.
Description
Technical field
The utility model relates to field of LED illumination, particularly a kind of constant current driving device of automatic equalization LED cross luma degree and LED lamp.
Background technology
As shown in Figure 1, be the structured flowchart of conventional linear constant current driving system.The below of LED string 1 ~ 4 connects a constant-current source respectively to ground.Raise and decline process at voltage, the illuminating state of LED string 1 ~ LED string 4 can change thereupon.As shown in Figure 2, for conventional linear constant current driving system oscillogram.As can be seen from Figure 2, LED string 1 ~ LED string 4 is sequential illumination, inside the cycle that each rectifier bridge exports, the lighting time of LED string 1 is the longest, the lighting time of LED string 2 ~ LED string 4 reduces successively, finally causes LED string 1 to reduce successively within a rectifier bridge output cycle to the brightness of LED string 4.Different according to the quantity of each LED string, each LED string luminance difference is different, and by the configuration of generally common LED1 ~ LED4 equal number lamp pearl, the luminance difference of LED1 and LED4 can reach 3:1.Meanwhile, due to the difference of each LED string average lighting time (power or brightness), the light decay of each LED string can be caused different, and LED1 light decay can be much faster than LED4, and the life-span of whole like this LED lamp can be limited to the light decay life-span of LED1.
Adopt the LED lamp of conventional linear constant current driving as bulb lamp, fluorescent tube etc., because the luminosity (being caused by above-mentioned lighting time difference) of LED lamp bead is inconsistent, when distance light fixture is nearer (such as 0.5m ~ 0.6m), it is partially dark that human eye can find out some lamp pearl in light fixture very easily, and overall sensation light fixture exists hot spot.Especially for this application of fluorescent tube, LED lamp bead serial be arranged on fluorescent tube, the inconsistent hot spot caused of LED lamp bead brightness clearly, can have a strong impact on the visual effect of light fixture, even to the impression that client causes light fixture to damage.
Thus prior art need to improve.
Utility model content
In view of above-mentioned the deficiencies in the prior art part, the purpose of this utility model is the constant current driving device and the LED lamp that provide a kind of automatic equalization LED cross luma degree, make the lighting time of each LED string and power all identical, the balanced brightness of each LED string, improves the useful life of LED lamp.
In order to achieve the above object, the utility model takes following technical scheme:
A constant current driving device for automatic equalization LED cross luma degree, comprises
Alternating current for inputting outside carries out rectification and the rectification module of powering to LED string group;
LED string group, comprises N number of LED string, is connected in series between N number of LED string;
N number of for controlling the switch module that LED string is lighted and extinguished, a switch module correspondence controls a LED string;
For controlling electric current in LED string, making the tail current source module of the constant current hold of LED string;
Voltage in detecting real-time tail current source module, when the voltage in tail current source module is higher than first threshold voltage, output overvoltage signal is to luminance proportion control module; When the voltage in tail current source module is lower than Second Threshold voltage, export the detection module of under-voltage signal to luminance proportion control module;
For within a commutation cycle, when receiving an overvoltage signal, make a switch module light corresponding LED string, after described luminance proportion control module receives N overvoltage signal continuously, by N number of switch module, light all LED strings; When receiving once under-voltage signal, make a switch module extinguish corresponding LED string, after described luminance proportion control module receives N under-voltage signal continuously, by N number of switch module, extinguish all LED strings; Make within a commutation cycle, the duration that each LED string is lighted is all different, and within N number of commutation cycle, the luminance proportion control module that each LED string total time of lighting is identical;
Wherein, N be more than or equal to 2 positive integer;
The input of described rectification module by LED string group connection detection module and the input of tail current source module, the output of described detection module connects the input of luminance proportion control module, the output head grounding of described tail current source module; N number of output of described luminance proportion control module connects N number of LED string by N number of switch module.
In the constant current driving device of described automatic equalization LED cross luma degree, described linear constant current drive unit also comprises that N number of voltage for being exported by detection module carries out level shift, voltage shifts that detection module is exported is to the level shift module of the voltage domain of switch module, a corresponding switch module of level shift module, described luminance proportion control module is by the N number of switch module of N number of level shift model calling.
In the constant current driving device of described automatic equalization LED cross luma degree, described switch module controls lighting and extinguishing of corresponding LED string by the break-make of self; The input of described switch module connects the positive pole of corresponding LED string, and the output of described switch module connects the negative pole of corresponding LED string, and the control end of described switch module connects the output of corresponding level shift module.
In the constant current driving device of described automatic equalization LED cross luma degree, described switch module comprises the first resistance and the first metal-oxide-semiconductor; The source electrode of described first metal-oxide-semiconductor be switch module input, connect the positive pole of corresponding LED string, also connected the grid of the first metal-oxide-semiconductor by the first resistance, the drain electrode of described first metal-oxide-semiconductor be switch module output, connect the negative pole of corresponding LED string, the grid of described first metal-oxide-semiconductor is the control end of switch module, the output connecting corresponding level shift module.
In the constant current driving device of described automatic equalization LED cross luma degree, described level shift module comprises the second resistance and the second metal-oxide-semiconductor, the grid of described second metal-oxide-semiconductor be level shift module input, connect output corresponding to luminance proportion control module, the drain electrode of described second metal-oxide-semiconductor is the control end of the output of level shift module, the switch module of connection correspondence, and the source electrode of described second metal-oxide-semiconductor is by the second grounding through resistance.
In the constant current driving device of described automatic equalization LED cross luma degree, described tail current source module comprises the first power supply, operational amplifier, the 3rd resistance and the 3rd metal-oxide-semiconductor; The drain electrode of described 3rd metal-oxide-semiconductor is the input of tail current source module, the negative pole of connection LED string group, the inverting input of the source electrode concatenation operation amplifier of described 3rd metal-oxide-semiconductor, also by the 3rd grounding through resistance, the negative pole of described first power supply is the output of tail current source module, the minus earth of described first power supply, the normal phase input end of the positive pole concatenation operation amplifier of described first power supply, the output of described operational amplifier connects the grid of the 3rd metal-oxide-semiconductor.
In the constant current driving device of described automatic equalization LED cross luma degree, described detection module comprises the 4th resistance, the 5th resistance, the 6th resistance, the first comparator, the second comparator and second source; One end of described 4th resistance be detection module input, connect the input of tail current source module and the negative pole of LED string group, the other end of described 4th resistance connects the normal phase input end of the first comparator, also connects one end of the 6th resistance and the normal phase input end of the second comparator by the 5th resistance; Described 6th grounding through resistance, the positive pole of described second source connects the inverting input of the first comparator and the inverting input of the second comparator, the minus earth of described second source; The output of described first comparator and the output of the second comparator be detection module output, be connected the input of luminance proportion control module.
In the constant current driving device of described automatic equalization LED cross luma degree, described N is 4.
A kind of LED lamp, comprises the constant current driving device of automatic equalization LED cross luma degree as above.
Compared to prior art, the constant current driving device of the automatic equalization LED cross luma degree that the utility model provides and LED lamp, by the voltage in detection module detecting real-time tail current source module, and output overvoltage or under-voltage signal are to luminance proportion control module; Luminance proportion control module is within a commutation cycle, when receiving an overvoltage signal, a switch module is made to light corresponding LED string, after described luminance proportion control module receives N overvoltage signal continuously, by N number of switch module, light all LED strings; When receiving once under-voltage signal, make a switch module extinguish corresponding LED string, after described luminance proportion control module receives N under-voltage signal continuously, by N number of switch module, extinguish all LED strings; Make within a commutation cycle, the duration that each LED string is lighted is all different; And within N number of commutation cycle, the total time that each LED string is lighted is identical; Because luminance proportion control module ensure that the total time that N number of LED string is lighted within N number of commutation cycle is all identical, therefore the power of each LED string within N number of commutation cycle is also identical, certainly, the brightness of each LED string is also just identical with useful life, achieves the object of automatic equalization LED cross luma degree.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of existing linear constant current drive system.
Fig. 2 be existing linear constant current drive system oscillogram.
The structured flowchart of the constant current driving device of the automatic equalization LED cross luma degree that Fig. 3 provides for the utility model.
The oscillogram of the constant current driving device of the automatic equalization LED cross luma degree that Fig. 4 provides for the utility model.
In the constant current driving device of the automatic equalization LED cross luma degree that Fig. 5 provides for the utility model, the circuit diagram of switch module.
In the constant current driving device of the automatic equalization LED cross luma degree that Fig. 6 provides for the utility model, the circuit diagram of level shift module.
In the constant current driving device of the automatic equalization LED cross luma degree that Fig. 7 provides for the utility model, the circuit diagram of tail current source module.
In the constant current driving device of the automatic equalization LED cross luma degree that Fig. 8 provides for the utility model, the circuit diagram of detection module.
In the constant current driving device of the automatic equalization LED cross luma degree that Fig. 9 provides for the utility model, the structured flowchart of another embodiment.
Embodiment
The utility model provides a kind of constant current driving device and LED lamp of automatic equalization LED cross luma degree.For making the purpose of this utility model, technical scheme and effect clearly, clearly, referring to the accompanying drawing embodiment that develops simultaneously, the utility model is further described.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
The constant current driving device of the automatic equalization LED cross luma degree that the utility model provides, wherein each module can adopt multiple connected mode, as shown in Figure 3, is a preferred embodiment of the present utility model.
The constant current driving device of the automatic equalization LED cross luma degree that the utility model provides, comprise rectification module 10, LED string group 20, tail current source module 30, detection module 40, luminance proportion control module 50 and N number of for controlling the switch module 70 that LED string is lighted and extinguished, wherein, a switch module correspondence controls a LED string.
Described rectification module 10, the alternating current for inputting outside carries out rectification and powers to LED string group 20; Preferably, described rectification module 10 is rectifier bridge.
Described LED string group 20, comprises N number of LED string, is connected in series between N number of LED string.
Described tail current source module 30, for controlling electric current in LED string, making the constant current hold of LED string.
Described detection module 40, for the voltage of the detecting real-time module in parallel with detection module 40, when the voltage in the module in parallel with detection module 40 is higher than first threshold voltage Vth1, output overvoltage signal is to luminance proportion control module 50; When voltage in the module in parallel with detection module 40 is lower than Second Threshold voltage Vth2, export under-voltage signal to luminance proportion control module 50.In the present embodiment, the module in parallel with detection module 40 is tail current source module 30.Therefore described detection module 40 is specifically for the voltage in detecting real-time tail current source module 30, and when the voltage in tail current source module 30 is higher than first threshold voltage Vth1, output overvoltage signal is to luminance proportion control module 50; When the voltage in tail current source module 30 is lower than Second Threshold voltage Vth2, export under-voltage signal to luminance proportion control module 50.First threshold voltage Vth1 is arranged so that the voltage in tail current source module 30 can not exceed first threshold voltage Vth1, serves the effect of overvoltage protection; Second Threshold voltage Vth2 is arranged so that the voltage in tail current source module 30 is not less than Second Threshold voltage Vth2, serves the effect of low-voltage variation; It can thus be appreciated that the utility model can by the voltage stabilization of tail current source module 30 between first threshold voltage Vth1 and Second Threshold voltage Vth2.
Described luminance proportion control module 50, for within a commutation cycle, when receiving an overvoltage signal, a switch module 70 is made to disconnect lighting corresponding LED string, after described luminance proportion control module 50 receives N overvoltage signal continuously, by N number of switch module 70(, all switch modules 70 are disconnected), light all LED strings; When receiving once under-voltage signal, a switch module 70 is made to open to extinguish corresponding LED string, after described luminance proportion control module 50 receives N under-voltage signal continuously, by N number of switch module 70(, all switch modules 70 are opened), extinguish all LED strings; Make within a commutation cycle, the duration that each LED string is lighted is all different, and namely the fluorescent lifetime of each LED string is different; And within N number of commutation cycle, the total time that each LED string is lighted is identical, namely the total time of each LED string luminescence is identical.Further, within a commutation cycle, the LED string lighted at first finally extinguishes, and second LED string penultimate lighted extinguishes, by that analogy; Certainly, each commutation cycle is not always the case, and like this, within N number of commutation cycle, by adjusting put in order (fully intermeshing) that LED string in each commutation cycle is lighted, makes the total time phase that N number of LED string is luminous within N number of commutation cycle.Because luminance proportion control module 50 ensure that the total time that N number of LED string is lighted within N number of commutation cycle is all identical, therefore the power of each LED string within N number of commutation cycle is also identical, certainly, the brightness of each LED string is also just identical with useful life, achieve the object of automatic equalization LED cross luma degree, improve the useful life of light fixture.
Wherein, N be more than or equal to 2 positive integer, the best value of described N is 3 and 4.
The input of described rectification module 10 by LED string group 20 connection detection module 40 and the input of tail current source module 30, the output of described detection module 40 connects the input of luminance proportion control module 50, the output head grounding of described tail current source module 30; N number of output of described luminance proportion control module 50 connects N number of LED string by N number of switch module 70.
Please continue to refer to Fig. 3, in the constant current driving device of the automatic equalization LED cross luma degree that the utility model provides, described N is preferably 4, namely, described LED string group 20 comprises four LED strings, be respectively the first LED string 210, second LED string 220, the 3rd LED string 230 and the 4th LED string 240, the lamp pearl quantity in each LED string can identical also can be different, determine as the case may be.
See also Fig. 4, Vac is the waveform of rectifier bridge output voltage, and VLED1, VLED2, VLED3 and VLED4 are respectively the voltage waveform of the first LED string 210, second LED string 220, the 3rd LED string 230 and the 4th LED string 240.First commutation cycle be (when rectifier bridge starts to power) when starting, and four LED strings are extinguished by the switch module 70 of correspondence.Along with output voltage Vac progressively improves, voltage in tail current source module 30 increases, and detection module 40 detects voltage in tail current source module 30 higher than first threshold voltage Vth1, and output overvoltage signal is to luminance proportion control module 50; Luminance proportion control module 50 lights the first LED string 210 by switch module 70.First LED string 210 is lighted, and the voltage in tail current source module 30 is pulled down to first threshold below voltage Vth1, temporarily can not light other LED strings again.Because output voltage Vac is in ascent stage always, the voltage regulation secondary in tail current source module 30 exceedes first threshold voltage Vth1, and luminance proportion control module 50 lights the second LED string 220 by switch module 70.Second LED string 220 is lighted, and due to dividing potential drop effect, the voltage in tail current source module 30 is pulled down to first threshold below voltage Vth1, temporarily can not light other LED strings again.After short time, the voltage third time in tail current source module 30 exceedes first threshold voltage Vth1, and luminance proportion control module 50 lights the 3rd LED string 230 by switch module 70.Voltage in tail current source module 30 is pulled down to first threshold below voltage Vth1 by lighting of the 3rd LED string 230, temporarily can not light other LED strings again.After short time, the voltage regulation in tail current source module 30 exceedes first threshold voltage Vth1 for four times, and luminance proportion control module 50 lights the 4th LED string 240 by switch module 70.Thus, at the output voltage ascent stage of first commutation cycle, four LED strings are all lighted.Output voltage when first commutation cycle enters the decline stage, voltage regulation in tail current source module 30 is once lower than Second Threshold voltage Vth2, after luminance proportion control module 50 receives under-voltage signal, control the 4th LED string 240 by switch module 70 to extinguish, namely the LED group 210 lighted at first is finally extinguished, the LED group 240 lighted at the latest is extinguished at first, the size of the fluorescent lifetime of four LED strings within first commutation cycle is made to be: the first LED string 210 > second LED string 220 > the 3rd LED string 230 > the 4th LED string 240.Owing to will guarantee in four commutation cycles, first LED string 210, second LED string 220, the 3rd LED string 230 are identical with the luminous total time of the 4th LED string 240, therefore within second commutation cycle, under the control of luminance proportion control module 50, the size of the fluorescent lifetime of four LED strings is: the second LED string 220 > the 3rd LED string 230 > the 4th LED string 240 > first LED string 210.By that analogy, in four commutation cycles, the order of lighting of four LED strings meets fully intermeshing.Finally, only need four commutation cycles that the fluorescent lifetime of four LED strings can be made identical, achieve the object of automatic equalization LED cross luma degree.Because the time compole of commutation cycle is short, even if four even more commutation cycle superpositions, its time is also extremely short, therefore the constant current driving device of automatic equalization LED cross luma degree that the utility model provides makes the fluorescent lifetime of each LED string identical, luminosity and power are also just identical, improve luminescent quality and the useful life of light fixture.
Please continue to refer to Fig. 3, in the constant current driving device of described automatic equalization LED cross luma degree, also comprise that N number of voltage for being exported by detection module 40 carries out level shift, voltage shifts that detection module 40 is exported is to the level shift module 60 of the voltage domain of switch module 70, a corresponding switch module 70 of level shift module 60, described luminance proportion control module 50 connects N number of switch module 70 by N number of level shift module 60.Because luminance proportion control module 50 can carry out control switch module 70 according to the output of detection module 40, and the negative sense that the ground reference of detection module 40 and tail current source module 30 is rectification module 10 exports, its ground reference is different from the ground reference of switch module 70, so need the output of detection module 40 to carry out level shift.By described level shift module 60, make the control of luminance proportion control module 50 pairs of switch modules 70 more accurate, further increase the equilibrium degree of LED string luminescence.
Further, described switch module 70 controls the extinguishing of corresponding LED string by the break-make of self and lights; The input of described switch module 70 connects the positive pole of corresponding LED string, and the output of described switch module 70 connects the negative pole of corresponding LED string, and the control end of described switch module connects the output of corresponding level shift module 60.When switch module 70 is in shutoff (disconnection) state, LED string is in illuminating state; When switch module 70 is in the state of unlatching (closing), LED string is in the state that (extinguishing) extinguishes.Adopt the mode of path and short circuit to LED string light and extinguishing controls, simple and practical, the circuit without the need to complexity can complete.
Refer to Fig. 5, described switch module 70 comprises the first resistance R1 and the first metal-oxide-semiconductor Q1; The source electrode of described first metal-oxide-semiconductor Q1 be switch module 70 input, connect the positive pole of corresponding LED string, also connected the grid of the first metal-oxide-semiconductor Q1 by the first resistance R1, the drain electrode of described first metal-oxide-semiconductor Q1 be switch module 70 output, connect the negative pole of corresponding LED string, the grid of described first metal-oxide-semiconductor Q1 is the control end of switch module 70, the output connecting corresponding level shift module 60.
Refer to Fig. 6, described level shift module 60 comprises the second resistance R2 and the second metal-oxide-semiconductor Q2, the grid of described second metal-oxide-semiconductor Q2 is the input of level shift module 60, the output of connection luminance proportion control module 50 correspondence, the drain electrode of described second metal-oxide-semiconductor Q2 is the control end of the output of level shift module 60, the switch module 70 of connection correspondence, and the source electrode of described second metal-oxide-semiconductor Q2 is by the second resistance R2 ground connection.
Refer to Fig. 7, described tail current source module 30 comprises the first power supply V1, operational amplifier U1, the 3rd resistance R3 and the 3rd metal-oxide-semiconductor Q3; The drain electrode of described 3rd metal-oxide-semiconductor Q3 is the input of tail current source module 30, the negative pole of connection LED string group 20, the inverting input of the source electrode concatenation operation amplifier U1 of described 3rd metal-oxide-semiconductor Q3, also by the 3rd resistance R3 ground connection, the negative pole of described first power supply V1 is the output of tail current source module 30, the minus earth of described first power supply V1, the normal phase input end of the positive pole concatenation operation amplifier U1 of described first power supply V1, the output of described operational amplifier U1 connects the grid of the 3rd metal-oxide-semiconductor Q3.
Refer to Fig. 8, described detection module 40 comprises the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the first comparator U2, the second comparator U3 and second source V2; One end of described 4th resistance R4 be detection module 40 input, connect the input of tail current source module 30 and the negative pole of LED string group 20, the other end of described 4th resistance R4 connects the normal phase input end of the first comparator U2, also connects one end of the 6th resistance R6 and the normal phase input end of the second comparator U2 by the 5th resistance R5; Described 6th resistance R6 ground connection, the positive pole of described second source V2 connects the inverting input of the first comparator U2 and the inverting input of the second comparator U3, the minus earth of described second source V2; Output and the output of the second comparator U3 of described first comparator U2 be detection module 40 output, be connected the input of luminance proportion control module 50.That is, when the first comparator U2 output low level, this low level is under-voltage signal, and when the second comparator U3 exports high level, this high level is overvoltage signal.Concrete, the voltage that described second source V2 exports is 1.2V.The ratio of described 4th resistance R4, the 5th resistance R5 and the 6th resistance R6 resistance is: 25:4:1.Setting like this, be the voltage inputted in order to ensure the input of detection module 40 when being less than 6V, detection module 40 exports under-voltage signal, when the voltage of the input input of detection module 40 is greater than 36V, detection module 40 output overvoltage signal.In the present embodiment, the resistance of described 4th resistance R4, the 5th resistance R5 and the 6th resistance R6 is respectively 1M Europe, 160K Europe and 40K Europe.
In another embodiment of the present utility model, the structured flowchart of the constant current driving device of described automatic equalization LED cross luma degree as shown in Figure 9, in parallel with detection module is LED string group 20 and tail current source module 30, therefore, the output voltage of what described detection module 40 detected is rectifier bridge 10, namely LED string group 20 and tail current source module 30 voltage sum, namely, the output voltage of described detection module 40 detecting real-time rectifier bridge 10, when the output voltage of rectifier bridge is between first threshold and Second Threshold (when the output voltage of rectifier bridge is higher than first threshold), output status signal 1 is to luminance proportion control module, when the output voltage of rectifier bridge is between Second Threshold and the 3rd threshold value (when the output voltage of rectifier bridge is higher than Second Threshold), output status signal 2 is to luminance proportion control module, when the output voltage of rectifier bridge is between the 3rd threshold value and the 4th threshold value (when the output voltage of rectifier bridge is higher than the 3rd threshold value), output status signal 3 is to luminance proportion control module, when the output voltage of rectifier bridge is higher than the 4th threshold value, output status signal 4 is to luminance proportion control module, when the output voltage of rectifier bridge is higher than N threshold value, output status signal N is to luminance proportion control module, wherein, first threshold < Second Threshold < the 3rd threshold value < the 4th threshold value < ... < N threshold value.
The size of described threshold value is: the VF voltage of LED string group 20 and the minimum sum of tail current source module 30.That is, when the commutation cycle just starts, LED string group 20 neither one LED string is lit, and first threshold is the minimum of tail current source module 30.After the output voltage of rectifier bridge exceedes first threshold, luminance proportion control module 50 lights a LED string, and first threshold is the VF voltage (the VF voltage of the LED string lighted) of LED string group 20 and the minimum sum of tail current source module 30.……。The output voltage of rectifier bridge is more than after N-1 threshold value, luminance proportion control module 50 lights N-1 LED string, now total N-1 LED string is lit, and N-1 threshold value is the VF voltage (the VF voltage of N-1 the LED string lighted) of LED string group 20 and the minimum sum of tail current source module 30.The output voltage of rectifier bridge is more than after N number of threshold value, and all LED strings are lit.The like, when rectifier bridge output voltage declines, the flow process of closing LED string is also like this.Due to other operation principles in embodiment illustrated in fig. 9 identical with a upper embodiment (control of luminance proportion control module 50 makes overvoltage signal and under-voltage signal correspondence into each status signal), do not repeat them here.
Based on the constant current driving device of the automatic equalization LED cross luma degree that a upper embodiment provides, the utility model also provides a kind of LED lamp, comprises the constant current driving device of automatic equalization LED cross luma degree as above.Because the operation principle of described LED lamp and feature elaborate in the embodiment shown in fig. 3, do not repeat them here.
Be understandable that; for those of ordinary skills; can be equal to according to the technical solution of the utility model and utility model design thereof and replace or change, and all these change or replace the protection range that all should belong to the claim appended by the utility model.
Claims (9)
1. a constant current driving device for automatic equalization LED cross luma degree, is characterized in that, comprise
Alternating current for inputting outside carries out rectification and the rectification module of powering to LED string group;
LED string group, comprises N number of LED string, is connected in series between N number of LED string;
N number of for controlling the switch module that LED string is lighted and extinguished, a switch module correspondence controls a LED string;
For controlling electric current in LED string, making the tail current source module of the constant current hold of LED string;
Voltage in detecting real-time tail current source module, when the voltage in tail current source module is higher than first threshold voltage, output overvoltage signal is to luminance proportion control module; When the voltage in tail current source module is lower than Second Threshold voltage, export the detection module of under-voltage signal to luminance proportion control module;
For within a commutation cycle, when receiving an overvoltage signal, make a switch module light corresponding LED string, after described luminance proportion control module receives N overvoltage signal continuously, by N number of switch module, light all LED strings; When receiving once under-voltage signal, make a switch module extinguish corresponding LED string, after described luminance proportion control module receives N under-voltage signal continuously, by N number of switch module, extinguish all LED strings; Make within a commutation cycle, the duration that each LED string is lighted is all different, and within N number of commutation cycle, the luminance proportion control module that each LED string total time of lighting is identical;
Wherein, N be more than or equal to 2 positive integer;
The input of described rectification module by LED string group connection detection module and the input of tail current source module, the output of described detection module connects the input of luminance proportion control module, the output head grounding of described tail current source module; N number of output of described luminance proportion control module connects N number of LED string by N number of switch module.
2. the constant current driving device of automatic equalization LED cross luma degree according to claim 1, it is characterized in that, described linear constant current drive unit also comprises that N number of voltage for being exported by detection module carries out level shift, voltage shifts that detection module is exported is to the level shift module of the voltage domain of switch module, a corresponding switch module of level shift module, described luminance proportion control module is by the N number of switch module of N number of level shift model calling.
3. the constant current driving device of automatic equalization LED cross luma degree according to claim 2, is characterized in that, described switch module controls lighting and extinguishing of corresponding LED string by the break-make of self; The input of described switch module connects the positive pole of corresponding LED string, and the output of described switch module connects the negative pole of corresponding LED string, and the control end of described switch module connects the output of corresponding level shift module.
4. the constant current driving device of automatic equalization LED cross luma degree according to claim 3, it is characterized in that, described switch module comprises the first resistance and the first metal-oxide-semiconductor; The source electrode of described first metal-oxide-semiconductor be switch module input, connect the positive pole of corresponding LED string, also connected the grid of the first metal-oxide-semiconductor by the first resistance, the drain electrode of described first metal-oxide-semiconductor be switch module output, connect the negative pole of corresponding LED string, the grid of described first metal-oxide-semiconductor is the control end of switch module, the output connecting corresponding level shift module.
5. the constant current driving device of automatic equalization LED cross luma degree according to claim 4, it is characterized in that, described level shift module comprises the second resistance and the second metal-oxide-semiconductor, the grid of described second metal-oxide-semiconductor be level shift module input, connect output corresponding to luminance proportion control module, the drain electrode of described second metal-oxide-semiconductor is the control end of the output of level shift module, the switch module of connection correspondence, and the source electrode of described second metal-oxide-semiconductor is by the second grounding through resistance.
6. the constant current driving device of automatic equalization LED cross luma degree according to claim 5, is characterized in that, described tail current source module comprises the first power supply, operational amplifier, the 3rd resistance and the 3rd metal-oxide-semiconductor; The drain electrode of described 3rd metal-oxide-semiconductor is the input of tail current source module, the negative pole of connection LED string group, the inverting input of the source electrode concatenation operation amplifier of described 3rd metal-oxide-semiconductor, also by the 3rd grounding through resistance, the negative pole of described first power supply is the output of tail current source module, the minus earth of described first power supply, the normal phase input end of the positive pole concatenation operation amplifier of described first power supply, the output of described operational amplifier connects the grid of the 3rd metal-oxide-semiconductor.
7. the constant current driving device of automatic equalization LED cross luma degree according to claim 6, is characterized in that, described detection module comprises the 4th resistance, the 5th resistance, the 6th resistance, the first comparator, the second comparator and second source; One end of described 4th resistance be detection module input, connect the input of tail current source module and the negative pole of LED string group, the other end of described 4th resistance connects the normal phase input end of the first comparator, also connects one end of the 6th resistance and the normal phase input end of the second comparator by the 5th resistance; Described 6th grounding through resistance, the positive pole of described second source connects the inverting input of the first comparator and the inverting input of the second comparator, the minus earth of described second source; The output of described first comparator and the output of the second comparator be detection module output, be connected the input of luminance proportion control module.
8. the constant current driving device of automatic equalization LED cross luma degree according to claim 7, it is characterized in that, described N is 4.
9. a LED lamp, is characterized in that, comprises the constant current driving device of the automatic equalization LED cross luma degree as described in claim 1-8 any one.
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| CN201520685342.1U CN204906820U (en) | 2015-09-07 | 2015-09-07 | Automatic constant current drive device and LED lamps and lanterns of balanced LED lamp cross luma degree |
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| CN201520685342.1U CN204906820U (en) | 2015-09-07 | 2015-09-07 | Automatic constant current drive device and LED lamps and lanterns of balanced LED lamp cross luma degree |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105813273A (en) * | 2016-05-12 | 2016-07-27 | 重庆四联光电科技有限公司 | Method and device for preventing lamp group from over-voltage and under-voltage working and lighting device |
| CN107660026A (en) * | 2017-10-27 | 2018-02-02 | 深圳市明微电子股份有限公司 | Constant current driver circuit for LED and light fixture |
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2015
- 2015-09-07 CN CN201520685342.1U patent/CN204906820U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105813273A (en) * | 2016-05-12 | 2016-07-27 | 重庆四联光电科技有限公司 | Method and device for preventing lamp group from over-voltage and under-voltage working and lighting device |
| CN105813273B (en) * | 2016-05-12 | 2019-06-18 | 重庆四联光电科技有限公司 | The method, apparatus and lighting apparatus of a kind of anti-lamp group over-voltage and under-voltage work |
| CN107660026A (en) * | 2017-10-27 | 2018-02-02 | 深圳市明微电子股份有限公司 | Constant current driver circuit for LED and light fixture |
| WO2019080549A1 (en) * | 2017-10-27 | 2019-05-02 | 深圳市明微电子股份有限公司 | Led constant-current driving circuit and lamp |
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