CN105704854A

CN105704854A - LED drive circuit with improved flicker performance, and LED lighting device comprising same

Info

Publication number: CN105704854A
Application number: CN201510973236.8A
Authority: CN
Inventors: 郑暎都; 陈成昊; 韩相昱; 郑蕙万
Original assignee: Seoul Semiconductor Co Ltd
Current assignee: Seoul Semiconductor Co Ltd
Priority date: 2014-12-12
Filing date: 2015-12-14
Publication date: 2016-06-22
Anticipated expiration: 2035-12-14
Also published as: CN109951920A; CN110072314A; CN105704854B; CN109951920B; CN205336575U; CN110072314B; WO2016093534A1

Abstract

The invention discloses an LED drive circuit with improved flicker performance, and an LED lighting device comprising same. Disclosed is an alternating current sequential drive type LED lighting device, the LED lighting device having improved flicker performance and being capable of reducing the light output deviation of the LED lighting device generated during operation intervals by removing nonluminous intervals of the LED lighting device by means of a loop-back compensation unit.

Description

The improved LED drive circuit of scintillation properties and include this LED light device

Technical field

The present invention relates to the improved LED drive circuit of a kind of scintillation properties and include this LED light device。More specifically, the present invention relates to a kind of LED light device alternation being sequentially driven under mode, it is possible to reduce the improved LED drive circuit of scintillation properties of the light output bias of the LED light device occurred in operation interval by eliminating LED extinguishing interval and include this LED light device。

Background technology

General LED type of drive is DC driven mode。Necessarily require the AC-DC current transformers such as SMPS when utilizing DC driven mode, and this power converter has existed following problem: improve the manufacture unit price of illuminating equipment；The miniaturization making illuminating equipment becomes difficulty；Reduce the energy efficiency of illuminating equipment；The shorter life-span causes the life-span shortening illuminating equipment。

For solving the problem points of above-mentioned DC driven mode, the exchange type of drive of LED is suggested。But, when utilizing based on the circuit of above-mentioned technology, not only can exist because of input voltage and the problem that causes power factor to reduce from electric current inconsistent of LED output, but also can exist and occur the user can the problem points of the scintillation of flicker that illuminates of perception。

Fig. 1 is for being used for illustrating the concept map of flicker (Flicker) performance。Recently, the flicker of Energy Star (EnergyStar) SPEC standard to becoming scintillation properties provides definition and providing as follows。

(1) definition glimmered

Flicker refers to the phenomenon of the change having brightness of illumination in the given time, and in severe cases, and user can the phenomenon that shake or glimmer of sensing light。This flicker major part is because the maximum light in the scheduled time exports phenomenon that is different from the output of minimum light and that cause。

(2) kind of the index of scintillation properties is represented

A) flicker index (FlickerIndex): as it is shown in figure 1, flicker index refers to, and average light exports the value that above area (Areal) obtains divided by whole light gasing surface long-pending (Area1+Area2) on the optical output waveform figure of period 1。Therefore, flicker index is represent that the average light occurred within a cycle above light of output is how many values Statistically, and its flicker index is more low, and flicker level is more good。

Flicker percentage ratio (PercentFlicker) or modulation depth (ModulationDepth): flicker percentage ratio refers to the minimum amount of light in the predetermined time and maximum amount are carried out the index of datumization。This flicker percentage ratio can be calculated by 100 × (maximum amount-minimum amount of light)/(maximum amount+minimum amount of light)。

(3) the flicker index regulation of Energy Star

-optical output waveform (Lightoutputwaveform) >=120Hz

-flicker index≤frequency × 0.001 (except atMax.Dimmer, more than 800Hz) (therefore, flicker index≤0.12 at 120 hz)

(4) result of study that flicker percentage ratio is carried out

According to the paper to the research that flicker percentage ratio carries out,

Flicker percentage ratio is defined as less than the interval below 0.033 × 2 × frequency and is not had influential interval,

Flicker percentage ratio is defined as low dangerous interval less than the interval below 0.033 × 2 × frequency。

As it has been described above, flicker level is considered an important criteria of LED light device performance gradually。

Additionally, Fig. 2 is that to be sequentially driven construction module figure, Fig. 3 schematically of LED light device be the oscillogram illustrating the relation that four steps according to prior art as shown in Figure 2 are sequentially driven between the driving voltage of LED light device and LED drive current to four steps according to prior art。Hereinafter, with reference to Fig. 2 and Fig. 3, the problem points of the LED light device according to prior art will be inquired into。

First, as in figure 2 it is shown, the LED light device 100 according to prior art can comprise: LED rectification part 10, LED illuminating part 20 and LED drive control part 30。

The rectification part 10 of the LED light device 100 according to the prior art alternating voltage V to receiving from external power source_ACCarry out rectification and generate commutating voltage Vrec, and the commutating voltage Vrec generated is exported LED illuminating part 20 and LED drive control part 30。As this rectification part 10, it is possible to use in known various rectification circuit such as full-wave rectifying circuit, half-wave rectifying circuit, and Fig. 2 illustrates the full-wave bridge rectifier circuit being made up of four diodes D1, D2, D3, D4。It addition, the LED illuminating part 20 according to prior art is become by four LED fabric of a LED group 21 to 4LED group 24, it constitutes and meets and can sequentially light according to the control of LED drive control part 30 and sequentially extinguish。It addition, the LED drive control part 30 according to prior art performs can sequentially light according to the voltage level of commutating voltage Vrec and sequentially extinguish the LED group 21 control function to the 4th LED group 24。

Especially, LED drive control part 30 according to prior art constitutes and can pass through with input voltage (namely, commutating voltage Vrec) voltage level increase or reduce LED drive current and by being sequentially driven interval to perform the form of current constant control function, and its object is to: for improving power factor (powerfactor:PF) and total harmonic distortion (totalharmonicsdistortion:THD) by making LED drive current show the staircase waveform form similar to sine wave, thus improving the power quality of LED light device。

Hereinafter, with reference to Fig. 3, the operating process of the LED light device 100 according to above-mentioned prior art will be carried out discussion specifically。As it is shown on figure 3, the LED drive control part 30 according to prior art can comprise the first constant current switch SW1, the second constant current switch SW2, the 3rd constant current switch SW3 and the 4th constant current switch SW4 to control being sequentially driven of LED group。Specifically, LED drive control part 30 according to prior art is realized by current constant control: be only light a LED group 21 in the first forward voltage more than level Vf1 the interval (first step operating range) less than the second forward voltage level Vf2 at commutating voltage Vrec, and makes LED drive current I_LEDBecome the first LED drive current。Similarly, LED drive control part 30 according to prior art realizes by controlling: commutating voltage Vrec be the second forward voltage more than level Vf2 and less than the 3rd forward voltage level Vf3 interval in disconnection the first constant current switch SW1 close the second constant current switch SW2, thus only closing LED group 21 and a 2nd LED group 22, and make LED drive current I_LEDBecome the second LED drive current I_LED2。Additionally, LED drive control part 30 according to prior art is realized by current constant control: commutating voltage Vrec be the 3rd forward voltage level Vf3 less than the interval (the 3rd step operating range) of the 4th forward voltage level Vf4 in disconnect the second rectifier switch SW2 close the 3rd rectifier switch SW3, thus lighting a LED group 21 to the 3rd LED group 23, and make LED drive current I_LEDBecome the 3rd LED drive current I_LED3。Finally, LED drive control part 30 according to prior art is realized by current constant control: disconnect the 3rd constant current switch SW3 in the interval (FOUR EASY STEPS is interval) that commutating voltage Vrec is the 4th forward voltage more than level Vf4, and close the 4th constant current switch SW4, thus a LED group 21 all being lighted to the 4th LED group 24, and make LED drive current I_LEDBecome the 4th LED drive current I_LED4。As it is shown on figure 3, make LED drive current (that is, the second LED drive current I in second step operating range by controlling_LED2) more than LED drive current (that is, the first LED drive current I in first step operating range_LED1), equally, make LED drive current (that is, the 3rd LED drive current I in the 3rd step operating range by controlling_LED3) more than LED drive current (that is, the second LED drive current I in second step operating range_LED2), and the 4th LED drive current I is made by controlling_LED4Maximum。Accordingly, can have staircase waveform shape as illustrated in fig. 3 according to the output of whole light of the LED light device 100 of prior art。Then, when utilizing LED light device 100 according to above-mentioned prior art, because of according to operating range the LED of luminescence sum and drive electric current different, so it is different by the output of the light of each operating range, therefore can there is following problem points, namely user may feel the inconvenience because causing by the difference of the output of the light of each operating range, and scintillation properties as above can be deteriorated。That is, the LED light device for the mode that is sequentially driven according to prior art as above, flicker percentage ratio can reach 100%, it is therefore desirable to it is improved。

It addition, for the LED light device 100 according to prior art as above, it is constituted as follows: based on the driving voltage that LED illuminating part 20 is provided, namely the voltage level of commutating voltage Vrec controls to be sequentially driven。But, for above-mentioned voltage detecting mode, there is its problem points that can not correctly reflect the current/voltage characteristic according to temperature。Namely, the forward voltage of LED group is different according to " the operation temperature of LED ", but for voltage detecting mode, because can not correctly reflect the I/V characteristic of the temperature according to above-mentioned LED, therefore the time point that LED drive current (LED light output) changes in operating range can be there is (such as, the time point of second step operating range it is changed to by first step operating range) upper moment reduces or the phenomenon of overlapping (overshoot), thus the problem points that the light output that there is LED light device is unstable。

Summary of the invention

It is an object of the invention to solve problem of the prior art as above point。

It is an object of the invention to provide the improved LED drive circuit of a kind of scintillation properties and include this LED light device, the LED light device that its alternation is sequentially driven under mode reduces light output bias by eliminating illegal light interval, thus the light being imbued with natural sense can be supplied to user。

In addition, another object of the present invention is to the improved LED drive circuit of a kind of scintillation properties is provided and includes this LED light device, its alternation is sequentially driven the size that the LED light device under mode controls to be fed to the LED drive current of LED based on the LED number lighted by operating range, thus reducing the light output bias of the LED light device occurred between operating range。

Additionally, a further object of the present invention is in that provide the improved LED drive circuit of a kind of scintillation properties and include this LED light device, being sequentially driven between LED group is controlled by it based on LED drive current detection mode, such that it is able to provide constant light to export。

In addition, a further object of the present invention is in that provide the improved LED drive circuit of a kind of scintillation properties and include this LED light device, its alternation is sequentially driven the LED light device under mode and utilizes the loopback compensation section can discharged by dual discharge path to improve circuit efficiency, it is possible to increase light quantity。

For realizing the purpose of the present invention as above and reaching the inventive feature of the distinctive effect of the following present invention and be constructed as follows。

According to an aspect of the present invention, open a kind of LED light device, including: rectification part, the alternating voltage applied being connected to alternating current power supply carries out all wave rectification, and provides LED illuminating part using the commutating voltage of all wave rectification as the first driving voltage；LED illuminating part, comprise a LED group to constitute to the n-th LED group, and it is from described rectification part, described commutating voltage is luminous as described first driving voltage reception in non-compensation is interval, and compensate interval in receive the second driving voltage and luminous from loopback compensation section, wherein, n is the positive integer of more than 2；Loopback (loop-back) compensation section, one end is connected to the described LED group negative pole end to a LED group in the (n-1)th LED group by charge path, described one end is additionally coupled to the described LED group positive terminal to a LED group in the (n-1)th LED group by discharge path, the other end is connected to LED drive control part, and utilize described commutating voltage to fill energy in charging interval, and provide described second driving voltage described compensation in interval to described LED illuminating part；LED drive control part, for detecting by being connected respectively to the LED drive current that a described LED group flows to the constant current switch of described n-th LED group, and controls a described LED group being sequentially driven to the n-th LED group according to the LED drive current detected。

Preferably, described loopback compensation section may be connected to the positive terminal of a described LED group and provides the second driving voltage to a described LED group in described compensation interval。

Preferably, described LED drive control part can set by the LED drive current value of each operating range based on the sum of the LED luminous by operating range, and by the LED drive current value of operating range, the LED drive current in associative operation interval is carried out current constant control according to what set, and described first LED drive current sets in the way of sequentially reducing to the n-th LED drive current, wherein, it is the first LED drive current to the n-th LED drive current by the LED drive current of each operating range。

Preferably, described LED drive control part can will be set as being inversely proportional to the sum of the LED luminous by operating range by the LED drive current value of each operating range, and by the LED drive current value of operating range, the LED drive current in associative operation interval is carried out current constant control according to what set, wherein, it is the first LED drive current to the n-th LED drive current by the LED drive current of each operating range。

Preferably, described LED illuminating part can include a LED group and the 2nd LED group, and the difference between a described LED group and the light output of described 2nd LED group during the light output of the described LED group during the first operating range and the second operating range can be below smooth output bias set in advance。

Preferably, described LED illuminating part can include a LED group and the 2nd LED group, and described second driving voltage can be more than the forward voltage level of a described LED group。

Preferably, described LED illuminating part can include a LED group and the 2nd LED group, and the peak value of described commutating voltage can be more than 2 times of the forward voltage level of a described LED group。

Preferably, described LED drive control part can also include: the first LED drive current configuration part to the n-th LED drive current configuration part, is able to set the LED drive current value that the first LED drive current value is corresponding to the n-th LED drive current value。

Preferably, described first LED drive current configuration part to described n-th LED drive current configuration part can be made up of variable resistance respectively。

Preferably, described LED drive control part comprises the steps that the first constant current switch is to the n-th constant current switch, it is connected respectively to a described LED group extremely described n-th respective negative pole end of LED group, and connect according to described operating range or separate the first current path to the n-th current path, and in each operating range, described LED drive current is carried out current constant control。

Preferably, described LED drive control part can also include: the (n+1)th constant current switch, between described loopback compensation section with described LED drive control part, connect or separate the (n+1)th current path between described loopback compensation section and described LED drive control part, and in described charging is interval, (n+1)th LED drive current is carried out current constant control。

Preferably, described LED drive control part can detect the charging current flowed by being connected to described (n+1)th constant current switch of described loopback compensation section, thus judging the entrance in charging interval and whether departing from, and entering, the time point that charging is interval disconnects the n-th constant current switch, and departing from, the time point that charging is interval closes described n-th constant current switch。

Preferably, described LED drive control part can close described (n+1)th constant current switch being connected to described loopback compensation section according to the rising of described commutating voltage on the time point entering the n-th operating range from the (n-1)th operating range, and detect the charging current flowed through, when the charging current detected rise to value set in advance above time, extinguish the n-th LED group by disconnecting described n-th constant current switch and enter between charging zone, when entering into the charging current detected after described charging interval and being down to below value set in advance, close the n-th constant current switch, thus again lighting described n-th LED group and being again introduced into the n-th operating range。

Preferably, the (n+1)th LED drive current value may be set to identical with the (n-1)th driving current value。

Preferably, described LED illuminating part can include a LED group and the 2nd LED group, and the forward voltage level of a described LED group can more than the forward voltage level of described 2nd LED group。

Preferably, described LED light device can also include: the n-th+2 switch, between node and described loopback compensation section between described (n-1)th LED group and described n-th LED group, and close according to the control of described LED drive control part or disconnect, wherein, described LED drive control part closes described n-th+2 switch on the n-th operating range entry time point, and disconnects described n-th+2 switch on interval time point entering described compensation。

Preferably, described LED light device can also include: the second compensation section, it is connected in parallel in described n-th LED group, and is charged during the n-th operating range, and to described n-th LED group supply driving voltage during the described n-th non-luminous illegal light interval of LED group。

Preferably, described loopback compensation section can be connected in parallel in the negative pole end of described n-th LED group, the other end of described loopback compensation section and described n-th LED group and be connected to described drive control part commonly by described n-th constant current switch。

Preferably, described LED illuminating part can comprise a LED group and the 2nd LED group, and the forward voltage level of a described LED group is smaller than or is equal to the forward voltage level of described 2nd LED group。

Preferably, described LED illuminating part can comprise a LED group, the 2nd LED group and the 3rd LED group, described loopback compensation section can be connected in parallel in the 2nd LED group and the 3rd LED group, one end of described loopback compensation section is connected to the positive terminal of a described LED group, thus being charged during the second operating range and the 3rd operating range, and described compensation in interval, described second driving voltage is provided to a LED group。

Preferably, described LED illuminating part can replace described 3rd LED group to comprise dummy load (dummyload)。

Preferably, described LED light device can also include: the second compensation section, it is connected in parallel with described n-th LED group, and is charged during described n-th operating range, and to described n-th LED group supply driving voltage during the described n-th non-luminous illegal light interval of LED group。

Preferably, described LED light device can also include: the second compensation section, it is connected in series in described n-th LED group, and be charged in the interval that voltage level is more than the n-th forward voltage level of described commutating voltage, and during the described n-th non-luminous illegal light interval of LED group, it be connected to the discharge path of described n-th LED group in parallel and supply driving voltage to described n-th LED group。

Preferably, described LED illuminating part can include a LED group, the 2nd LED group and the 3rd LED group, node between described 2nd LED group and described 3rd LED group is connected to the negative pole end of described rectification part, described loopback compensation section is connected in parallel with the 2nd LED group and the 3rd LED group formation, one end of described loopback compensation section is connected to the negative pole end of a described LED group, and be charged during the second operating range and the 3rd operating range, and supply described second driving voltage to a described LED group and described 3rd LED group during described discharge range。

According to a further aspect in the invention, open a kind of LED drive circuit, for controlling the driving of LED illuminating part, described LED illuminating part includes a LED group to the n-th LED group, and from rectification part, the commutating voltage of all wave rectification is received as the first driving voltage, n is the positive integer of more than 2, wherein, described LED drive circuit includes: loopback compensation section, one end is connected to the described LED group negative pole end to any one the LED group in the (n-1)th LED group by charge path, described one end is additionally connected to the described LED group positive terminal to any one the LED group in the (n-1)th LED group by discharge path, the other end is connected to LED drive control part, and utilize described commutating voltage to fill energy in charging interval, and provide the second driving voltage compensating in interval to described LED illuminating part；LED drive control part, detects by being connected respectively to the LED drive current that a described LED group flows to the constant current switch of described n-th LED group, and controls a described LED group being sequentially driven to the n-th LED group according to the LED drive current detected。

Preferably, described loopback compensation section may be connected to the positive terminal of a described LED group, thus providing the second driving voltage to a described LED group in described compensation interval。

Preferably, described LED drive control part can set by the LED drive current value of each operating range based on the sum of the LED luminous by operating range, and by the LED drive current value of each operating range, the LED drive current in associative operation interval is carried out current constant control according to what set, and described first LED drive current sets in the way of sequentially reducing to the n-th LED drive current, wherein, it is the first LED drive current to the n-th LED drive current by the LED drive current of each operating range。

Preferably, described LED illuminating part can comprise a LED group and the 2nd LED group, and described second driving voltage can be more than the forward voltage level of a described LED group。

Preferably, described LED illuminating part can comprise a LED group and the 2nd LED group, and the peak value of described commutating voltage can be more than 2 times of the forward voltage level of a described LED group。

Preferably, described LED illuminating part can comprise a LED group and the 2nd LED group, and the forward voltage level of a described LED group can more than the forward voltage level of described 2nd LED group。

Preferably, described LED drive circuit can also include: the n-th+2 switch, between node and described loopback compensation section between described (n-1)th LED group and described n-th LED group, and close according to the control of described LED drive control part or disconnect, wherein, described LED drive control part closes described n-th+2 switch on the n-th operating range entry time point, and disconnects described n-th+2 switch on interval time point entering described compensation。

Preferably, described LED drive circuit can also include: the second compensation section, it is connected in parallel in described n-th LED group, and is charged during the n-th operating range, and to described n-th LED group supply driving voltage during the described n-th non-luminous illegal light interval of LED group。

Preferably, described LED illuminating part can replace described 3rd LED group to comprise dummy load。

Preferably, described LED drive circuit can also include: the second compensation section, it is connected in parallel with described n-th LED group, and is charged during described n-th operating range, and to described n-th LED group supply driving voltage during the described n-th non-luminous illegal light interval of LED group。

Preferably, described LED drive circuit can also include: the second compensation section, it is connected in series in described n-th LED group, and be charged in the interval that voltage level is more than the n-th forward voltage level of described commutating voltage, and during the described n-th non-luminous illegal light interval of LED group, it be connected to the discharge path of described n-th LED group in parallel and supply driving voltage to described n-th LED group。

According to another aspect of the invention, open a kind of LED light device, including: rectification part, the alternating voltage applied being connected to alternating current power supply carries out all wave rectification, and provides LED illuminating part using the commutating voltage of all wave rectification as the first driving voltage；LED illuminating part, comprise a LED group and the 2nd LED group and constitute, and non-compensate interval in from described rectification part, described commutating voltage is received and luminous as described first driving voltage, and receive the second driving voltage and luminous from loopback compensation section in compensation interval；Loopback compensation section, between node and LED drive control part between a described LED group and described 2nd LED group, described commutating voltage is utilized to fill energy in charging interval, and provide described second driving voltage described compensation in interval to a described LED group and described 2nd LED group, wherein, described charging interval is the first operating range；LED drive control part, the LED drive current that detection is flowed by being connected respectively to the constant current switch of a described LED group and described 2nd LED group, and the deformation controlling a described LED group and described 2nd LED group according to the LED drive current detected is sequentially driven, wherein, described LED drive control part detects the charging current flowed by being connected to the constant current switch of described loopback compensation section, interval thus judging to charge enter and whether depart from, and entering the constant current switch disconnecting described 2nd LED group on the time point that charging is interval, and it is connected to the constant current switch of described 2nd LED group departing from Guan Bi on the time point that charging is interval。

Other another aspect according to the present invention, open a kind of LED drive circuit, for controlling the driving of LED illuminating part, described LED illuminating part comprises a LED and the two LED group, and from rectification part, the commutating voltage of all wave rectification is received as the first driving voltage, wherein, described LED drive circuit includes: loopback compensation section, between node and LED drive control part between a described LED group and the 2nd LED group, described commutating voltage is utilized to fill energy in charging interval, and provide the second driving voltage compensating in interval to a described LED group and described 2nd LED group, wherein, described charging interval is the first operating range；LED drive control part, the LED drive current that detection is flowed by being connected respectively to the constant current switch of a described LED group and described 2nd LED group, and the deformation controlling a described LED group and described 2nd LED group according to the LED drive current detected is sequentially driven, wherein, described LED drive control part detects the charging current flowed by being connected to the constant current switch of described loopback compensation section, interval thus judging to charge enter and whether depart from, and entering the constant current switch disconnecting described 2nd LED group on the time point that charging is interval, and it is connected to the constant current switch of described 2nd LED group departing from Guan Bi on the time point that charging is interval。

Other another aspect according to the present invention, open a kind of LED light device, including: rectification part, the alternating voltage applied being connected to alternating current power supply carries out all wave rectification, and provides LED illuminating part using the commutating voltage of all wave rectification as the first driving voltage；LED illuminating part, comprise a LED group to constitute to the n-th LED group, non-compensate interval in from described rectification part, described commutating voltage is luminous as described first driving voltage reception, and compensate interval in receive the second driving voltage and luminous from loopback compensation section, wherein, n is the positive integer of more than 2；Loopback compensation section, between node and LED drive control part between mLED group and m+1LED group, described commutating voltage is utilized to fill energy in charging interval, and provide described second driving voltage to the LED group of second group during between described the first compensating basin compensating interval, and during between described the second compensating basin compensating interval, the LED group of described second group and the LED component of first group be you can well imagine for described second driving voltage, wherein, m is the positive integer less than n, the LED group of described second group is the m+1LED group LED group to described n-th LED group, the LED group of described first group is the described LED group LED group to described mLED group；LED drive control part, is controlled the driving of a described LED group to the n-th LED group according to the voltage level of described commutating voltage。

Preferably, described loopback compensation section can be connected to the positive terminal of described m+1LED group by the first discharge path, and be connected to the positive terminal of a described LED group by the second discharge path。

Preferably, the LED group of described first group period between described first compensating basin can be driven by described first driving voltage。

Preferably, compensating period between interval and described second compensating basin described first, the LED group of described first group and the LED group of described second group can be driven independently of each other。

Preferably, the forward voltage level of the LED group of described first group is smaller than or is equal to the forward voltage level of the LED group of described second group。

Preferably, described LED drive control part can also include: the first LED drive current configuration part to the n-th LED drive current configuration part, the LED drive current value corresponding to the n-th LED drive current value for setting the first LED drive current value respectively。

Other another aspects according to the present invention, open a kind of LED drive circuit, for controlling the driving of LED illuminating part, described LED illuminating part comprises a LED group to the n-th LED group, and from rectification part, the commutating voltage of all wave rectification is received as the first driving voltage, n is the positive integer of more than 2, wherein, described LED drive circuit includes: loopback compensation section, between node and LED drive control part between mLED group and m+1LED group, described commutating voltage is utilized to fill energy in charging interval, and provide the second driving voltage to the LED group of second group during compensating between the first interval compensating basin, and during between described the second compensating basin compensating interval, the LED group of described second group and the LED component of first group be you can well imagine for described second driving voltage, wherein, m is the integer less than n, the LED group of described second group is the m+1LED group LED group to described n-th LED group, the LED group of described first group is the described LED group LED group to described mLED group；LED drive control part, is controlled the driving of a described LED group to the n-th LED group according to the voltage level of described commutating voltage。

Preferred embodiment according to the present invention, by utilizing loopback (loop-back) compensation section to eliminate illegal light interval, such that it is able to bring the effect reducing light output bias and provide the user with the light being imbued with natural sense。

Additionally, according to the present invention, the alternation of the present invention is sequentially driven the LED light device under mode, following effect can be brought: control to supply the size of the LED drive current to LED based on the LED number lighted by operating range, thus reducing the light output bias of the LED light device occurred in operating range。

Additionally, according to the present invention, following effect can be brought: control being sequentially driven between each LED group based on LED drive current detection mode, thus comparing the LED light device of the prior art being sequentially driven controlling between each LED group based on LED driving voltage detection mode, it is possible to provide the constant light output improved further。

It addition, according to the present invention it is possible to bring following effect: utilize can by dual discharge path the loopback compensation section of dual electric discharge, such that it is able to improve circuit efficiency and increase light quantity。

Accompanying drawing explanation

Fig. 1 is an illustration for the concept map of scintillation properties。

Fig. 2 is the composition module map schematically that four steps according to prior art are sequentially driven LED light device。

Fig. 3 indicates that the oscillogram of the relation between driving voltage and the LED drive current of the LED light device of the prior art illustrated in Fig. 2。

Fig. 4 is the composition module map schematically of the LED light device that according to the present invention implements。

Fig. 5 a to Fig. 5 d indicates that the switching control state by each operating range of the LED light device of the 1st embodiment according to the present invention as shown in Figure 4 and the composition module map of LED drive current。

Fig. 6 is the oscillogram illustrating the light output relation according to the commutating voltage temporally of LED light device of the 1st embodiment of the present invention as shown in Figure 4, LED drive current, input current and LED illuminating part。

Fig. 7 is the composition module map schematically of the LED light device of the 2nd embodiment according to the present invention。

Fig. 8 a to Fig. 8 e is the composition module map of the switching control state by operating range of the LED light device of the 2nd embodiment according to the present invention as shown in Figure 7 and LED drive current。

Fig. 9 is the composition module map schematically of the LED light device of the 3rd embodiment according to the present invention。

Figure 10 is the composition module map schematically of the LED light device of the 4th embodiment according to the present invention。

Figure 11 is the composition module map schematically of the LED light device of the 5th embodiment according to the present invention。

Figure 12 a to Figure 12 c is the composition module map of the switching control state by operating range of the LED light device illustrating the 5th embodiment according to the present invention as shown in figure 11 and LED drive current。

Figure 13 is the oscillogram illustrating the light output relation according to the commutating voltage temporally of LED light device of the 5th embodiment as shown in figure 11, LED drive current, input current and LED illuminating part。

Figure 14 is the composition module map schematically of the LED light device of the 6th embodiment according to the present invention。

Figure 15 a to Figure 15 c is the composition module map of the switching control state by operating range of the LED light device of the 6th embodiment according to the present invention as shown in figure 14 and LED drive current。

Figure 16 is the oscillogram of the light output relation of the commutating voltage temporally of LED light device of the 6th embodiment illustrating the present invention illustrated in Figure 14, LED drive current, input current and LED illuminating part。

Figure 17 is the composition module map schematically of the LED light device of the 7th embodiment according to the present invention。

Figure 18 is the composition module map schematically of the LED light device of the 8th embodiment according to the present invention。

Figure 19 is the composition module map schematically of the LED light device of the 9th embodiment according to the present invention。

Figure 20 is the composition module map schematically of the LED light device of the 10th embodiment according to the present invention。

Figure 21 is the composition module map schematically of the LED light device of the 11st embodiment according to the present invention。

Figure 22 is the composition module map schematically of the LED light device of the 12nd embodiment according to the present invention。

Figure 23 is the composition module map schematically of the LED light device of the 13rd embodiment according to the present invention。

Figure 24 a to Figure 24 d indicate that the LED light device of the 13rd embodiment of the present invention illustrated in Figure 23 by the switching control state of operating range, by the composition module map of the driving electric current of LED group and the charging and discharging currents of loopback (Loop-back) compensation section。

Figure 25 represents the oscillogram driving electric current, loopback compensation section charging and discharging currents that the commutating voltage temporally of LED light device of the 13rd embodiment according to the present invention shown in Figure 23, a LED group drive electric current, second group of LED。

Figure 26 is the composition module map schematically of the LED light device of the 14th embodiment according to the present invention。

Figure 27 is the composition module map schematically of the LED light device of the 15th embodiment according to the present invention。

Figure 28 is the composition module map schematically of the LED light device of the 16th embodiment according to the present invention。

Detailed description of the invention

The following detailed description that the present invention is carried out is with reference to for implementing the accompanying drawing that specific embodiment exemplarily illustrates。These embodiments will make those skilled in the art fully can implement the present invention and give detailed description。Be appreciated that although the various embodiment of the present invention is mutually different, but need not be mutually exclusive。Such as, specific shape described herein, structure and characteristic can be embodied as other embodiment according to the embodiment technological thought without deviating from the present invention and scope。In addition, it is to be understood that the position of individual other constituent element in each embodiment being disclosed or arrange and can be changed without departing from the technological thought of the present invention and scope。Therefore, following detailed description is not construed as circumscribed meaning, if suitably explained, the scope of the present invention is confined to claims together with all scopes of the claim equalization advocated with claims。Similar reference marks in accompanying drawing represents and runs through multiple side and identical or similar function。

Hereinafter, in order to enable the personnel in the technical field belonging to the present invention with ABC to be easily implemented with the present invention, with reference to the preferred embodiment of the present invention, and the present invention will be described in detail with reference to accompanying drawing。

[the preferred embodiments of the present invention]

In an embodiment of the present invention, term " LED group " refers to that multiple LED (or multiple luminescence unit) is connected by series/parallel/series-parallel system, and the set of controlled (that is, light together/extinguish) LED can be carried out as a unit according to the control of LED drive module。

It addition, term " the first forward voltage level V_f1" refer to drive the critical voltage level of a LED group, and term " the second forward voltage level V_f2" refer to be driven through the critical voltage level (namely; the forward voltage level of a LED group and the forward voltage level addition of the 2nd LED group and the voltage level that obtains) of a LED group that series system connects and the 2nd LED group, and term " the 3rd forward voltage level V_f3" refer to be driven through the critical voltage level of the first to the 3rd LED group connected and connect。That is, " the n-th forward voltage level V_fn" refer to be driven through series connection and the critical voltage level of the first to the n-th LED group of connecting (that is, be all added by the forward voltage level of the forward voltage level of 1LED group to the n-th LED group and obtain voltage level)。

Additionally, term " based on driving voltage detection be sequentially driven mode " or " the multistep type of drive of detection based on driving voltage " refer to a kind of LED drive module to driving LED by receiving the time dependent input voltage of its size, make multiple LED group luminous in order along with the increase of the input voltage received, and the type of drive making it sequentially extinguish according to the reduction of received input voltage。Additionally, term " based on driving voltage detection be sequentially driven mode " or " the multistep type of drive of detection based on driving voltage " refer to a kind of LED drive module to driving LED by receiving the time dependent input voltage of its size, light and extinguish the type of drive of the multiple LED groups constituting LED illuminating part in order according to the increase and decrease of LED illuminating part or the LED drive current of the rectifier switch being connected to LED illuminating part。Additionally, perception with driving voltage detection mode or driving current detecting mode is independently, for being sequentially driven mode or multistep type of drive, first paragraph operating range refers to the operating range that an only described LED group is luminous, second segment operating range refers to the operating range of only a described LED group and the luminescence of the 2nd LED group, and n-th section of operating range refers to the described LED group operating range to all luminescences of the n-th LED group。

It addition, term " the first driving voltage " refers to the driving voltage that input voltage itself or input voltage are carried out predetermined process (such as, by the process of the processes such as rectified current) and once supply to LED group。It addition, after term " the second driving voltage " refers to that input voltage stores energy storage element, by the driving voltage of energy storage element secondary supply to LED group。After this second driving voltage exemplarily may is that input voltage is stored in capacitor, by the driving voltage of the capacitor supply after charging to LED group。Accordingly, except its except distinguishingly being distinguished and be referred to as " the first driving voltage " or " the second driving voltage " except, the implication of term " driving voltage " includes the first driving voltage and/or the second driving voltage that are supplied in LED group。

" LED group drives electric current " refers to independently to flow with operating range the LED drive current of specific LED group it addition, term。Such as, a LED group drives electric current to refer to the LED drive current flowed by a LED group, and similarly, the n-th LED group drives electric current to refer to the LED drive current flowed by the n-th LED group。LED group drives electric current to change over time。

On the contrary, term " LED drive current " refers to the driving electric current that flowed during specific operating range by (multiple) LED group。Such as, the first LED drive current refers to the LED drive current of flowing during the first operating range, and the second LED drive current refers to the LED drive current of flowing during the second operating range。Similarly, the n-th LED drive current refers to the LED drive current of flowing during the n-th operating range。LED drive current can not change over time, and utilizes constant current switch and current constant control is predetermined value。

It addition, term " the first driving voltage " refers to the driving voltage that input voltage itself or input voltage are carried out certain process (such as, by the process of the processes such as continuous current) and once supply to LED group。It addition, " the second driving voltage " refers to after input voltage stores energy storage unit (such as, loopback compensation section), by the driving voltage of energy storage unit secondary supply to LED group。Exemplarily, this second driving voltage can be store to after capacitor at input voltage, by the driving voltage of the capacitor supply after charging to LED group。Therefore, except except distinguishingly being distinguished and be referred to as " the first driving voltage " or " the second driving voltage " except, term " driving voltage " is the implication including the first driving voltage and/or the second driving voltage supplied to LED group。

It addition, term " compensating interval " refers in being sequentially driven mode, the supply of LED group, less than the interval of the forward voltage level pre-seted, namely can not be driven the interval of electric current by the voltage level of input voltage (constant current voltage)。Such as, the first forward voltage level V_f1Compensate interval and refer to that the voltage level of constant current voltage is less than V_f1Interval。In the case, compensating interval is between non-light-emitting area。It addition, the second forward voltage level V_f2Compensate interval and refer to that voltage level is less than V_f2Interval。Accordingly, the n-th forward voltage level V_fnRepresent that the voltage level of commutating voltage is less than V_fnInterval。It addition, term the first forward voltage level V_f1Compensating interval implication is compensate in interval at the first forward voltage level Vf1 to pass through the second driving voltage supply to LED group, thus the supply of LED group being driven electric current, and term the second forward voltage level V_f2The implication compensated is at the second forward voltage level V_f2Compensate interval interior by the second driving voltage supply to LED group。Therefore, the n-th forward voltage level Vfn compensates and refers at the n-th forward voltage level V_fnCompensate interval interior by the second driving voltage supply to LED group。

Additionally, term " first compensates interval " refers to that (multiple) LED group once is provided the interval of the second driving voltage by energy storage unit, and (multiple) LED group is provided the interval of the second driving voltage by " second compensates interval " with referring to energy storage unit secondary。Such as, for the purpose of the present invention, the 2nd LED group can once be supplied the second driving voltage to the n-th LED group by loopback compensation section in the second forward voltage level compensation interval, and at the first forward voltage level V_f1Compensate in interval and can supply the second driving voltage to a LED group to the n-th LED group secondary。In the case, the first compensation interval refers to that the voltage level of commutating voltage is less than V_f2Interval, second compensates interval refers to that the voltage level of commutating voltage is less than V_f1Interval。Above-mentioned first compensates interval and the second compensation interval can realize various change according to the design of LED drive circuit, and therefore it is understood not to the implication in an absolute sense。

It addition, term " one group of LED group " is referred in specific (multiple) LED group compensating and being obtained the second driving voltage in interval by identical amplification path (circuit)。

It addition, term " non-compensation interval (normal operating interval) " refers to not carry out being provided the interval of the process of the second driving voltage by loopback compensation section, term " charging interval " finger ring goes back to the interval that compensation section is charged。The non-interval that compensates can be identical with charging interval, or charging interval can be the part that non-compensation is interval。

It addition, in this manual, the V used to represent specific voltage, specific time point, specific temperature₁、V₂、V₃、……、t₁、t₂、……、T₁、T₂、T₃It is not intended to represent that absolute value uses Deng term, and the relative value being able to mutually distinguish and using。

The composition of the 1st embodiment of LED light device 1000 and function

Fig. 4 is the composition module map schematically of the improved LED light device of scintillation properties (following, to be referred to as " LED light device ") of the 1st embodiment according to the present invention。Hereinafter, the composition and function to the LED light device 1000 according to the present invention with reference to Fig. 4 is simply investigated。

First, the comprehensive technological thought of the composition LED light device 1000 according to the present invention is investigated。As mentioned above, AC LED illuminator for the mode that is sequentially driven according to prior art, its LED group is lit in order according to the voltage level of the driving voltage of supply to LED illuminating part 20 and is off, therefore at the voltage level of driving voltage less than the first forward voltage level V_f1Interval in there is all non-luminous illegal light interval of any one LED group。Additionally, AC LED illuminator for the order type of drive according to prior art, rising along with the voltage level supplying the driving voltage to LED illuminating part 20, the number of the LED lighted increases therewith, and along with the decline of the voltage level supplying the driving voltage to LED illuminating part 400, the number of the LED lighted reduces therewith。Because being sequentially driven the above-mentioned feature of the AC LED illuminator of mode, it is particularly present the problem points that a kind of scintillation properties is excessively poor。

Therefore, technological thought the most basic according to the present invention is: by the non-luminous interval of LED illuminating part 400 of the LED light device 1000 in the operation of elimination LED light device 1000, namely between non-light-emitting area, thus improving the scintillation properties of LED light device 1000。For performing above-mentioned function, the present invention proposes the compensation section under loopback (loopback) mode, and by above-mentioned loopback compensation section 300 in non-light-emitting area in supply the second driving voltage to LED illuminating part 400, thus eliminating between non-light-emitting area。

It addition, with scintillation properties as above relatively, for the AC LED illuminator being sequentially driven under mode, the reason of its scintillation properties difference is in that, the number of LED drive current and the LED lighted by operating range is proportionally controlled。Therefore, for solving above-mentioned problem points, the present invention proposes a kind of to control inversely by the LED light device that constitutes of the LED drive current of operating range ground with the number of the LED lighted by operating range。Therefore, along with the present invention takes above-mentioned LED drive current control mode, when the number of the LED lighted according to operating range is relatively small, its can make this operating range by controlling during LED drive current relatively bigger, and in the relatively more situation of number of the LED lighted, its can make this operating range by controlling during LED drive current relatively smaller, such that it is able to provide almost balanced light output by operating range。LED drive current control mode according to the above-mentioned present invention will be illustrated in following part with reference to Fig. 5 a to Fig. 5 d and Fig. 6。

First, as shown in Figure 4, rectification part 200, loopback compensation section 300, LED illuminating part 400 and LED drive control part 500 can be comprised according to the LED light device 1000 of the present invention。It addition, in above-mentioned element, it is possible to constituted drive circuit by loopback compensation section 300 and LED drive control part 500。

First, illuminating part 400 can be made up of multiple LED groups, and the multiple LED groups being included in LED illuminating part 400 can be luminous in order according to the control of LED drive control part 500 and extinguish in order。In the diagram, disclose a kind of LED illuminating part 400 comprising a LED group 410 and the 2nd LED group 420, but it will be appreciated by those skilled in the art that the number that can change the LED group being included in LED illuminating part 400 according to demand and diversely。Hereinafter, for the convenience illustrated and understand, illustrate for standard with the embodiment that the illuminating part 400 of LED is made up of two LED groups, but the invention is not limited in this。Such as, LED illuminating part 400 can be made up of to four LED groups of the 4th LED group (not shown) a LED group 410, can also be made up of n LED group of a LED group 410 to the n-th LED group (not shown), but as long as those skilled in the art are all appreciated that the technology purport intactly comprising the present invention, it all will belong within scope of the presently claimed invention。

It addition, the composition according to embodiment, a LED group 410 and the 2nd LED group 420 can have mutually different forward voltage level。Such as, when a LED group 410 and the 2nd LED group 420 comprise the LED element of mutually different number respectively, or when a LED group 410 and the 2nd LED group 420 have the in series or in parallel of mutually different mode or connection in series-parallel annexation, a LED group 410 and the 2nd LED group 420 can have mutually different forward voltage level。Only, for the preferred embodiment of the invention, the design of a LED group 410 needs to meet: have the forward voltage level that the second driving voltage can supplied in compensation is interval drives by loopback compensation section 300。According to an exemplary embodiment, the composition of a LED group 410 can meet: can make the peak value V of commutating voltage_{rec_peak}Become more than the twice of forward voltage level of a LED group 410。It addition, according to an exemplary embodiment, the composition of a LED group 410 and the 2nd LED group 420 can meet: the forward voltage level forward voltage level equal to or less than the 2nd LED group 420 of a LED group 410 can be made。When being designed by above-mentioned design, a LED group 410 is at alternating voltage V_ACThe whole cycle in can remain illuminating state。

It addition, for other exemplary embodiments, for improving scintillation properties as above, it is preferable that require over design and realize: alternating voltage V_ACWhole interval in remain the number of a LED group 410 composition LED of the illuminating state number more than the 2nd only luminous during the second operating range LED group 420 composition LED。Accordingly, in such a case, it is possible to meet by designing: the forward voltage level of a LED group 410 is significantly more than the forward voltage level of the 2nd LED group 420。

The rectification part 200 according to the present invention as shown in Figure 4 is constituted as follows: to the alternating voltage V received from external power source_ACCarry out rectification and generate and export commutating voltage V_rec。One in known various rectification circuit such as full-wave rectifying circuit, half-wave rectifying circuit can be utilized as above-mentioned rectification part 200。Rectification part 200 is constituted as follows: the commutating voltage V that will generate_recThere is provided to loopback compensation section 300, LED illuminating part 400, LED drive control part 500。Fig. 4 illustrates by 4 diode D₁、D₂、D₃、D₄The full-wave bridge rectifier circuit constituted。

It addition, the loopback compensation section 300 according to the present invention is constituted as follows: utilize commutating voltage Vrec to fill energy in charging interval, and in compensation is interval, the second driving voltage can be provided to LED illuminating part 400。By the first capacitor C in Fig. 4₁It is shown as the loopback compensation section 300 according to the present invention。But the invention is not limited in this, it is possible to adopt in known various compensation circuit (such as, filling out paddy (valleyfill) circuit) according to demand。

It addition, as it is shown in figure 5, one end of loopback compensation section 300 is connected to the positive terminal of a LED group 410, and the other end of loopback compensation section 300 is by the 3rd constant current switch SW₃And it is connected to LED drive control part 500。Certainly, the composition according to embodiment, one end of loopback compensation section 300 is also connected to the positive terminal of other LED groups。Such as, for the embodiment being become LED illuminating part 400 by 4 LED fabric, its composition can meet: one end of loopback compensation section 300 can be made to be connected to the positive terminal of the 2nd LED group。In the case, the composition of loopback compensation section 300 can meet: can compensate interval in supply the second driving voltage to the 2nd LED group (or the 2nd LED group to the 3rd LED group etc.)。Hereinafter, the embodiment that will be connected to the positive terminal of a LED group 410 with one end of loopback compensation section 300 and can be constituted with supplying the second driving voltage to the first LED group 410 in compensation is interval is as the criterion and illustrates。

It addition, for embodiment as shown in Figure 4, constitute as follows according to the loopback compensation section 300 of the present invention: at the second operating range (that is, commutating voltage V_recVoltage level be the second forward voltage level V_f2Above interval) period be charged, and between non-light-emitting area (that is, commutating voltage V_recVoltage level less than the first forward voltage level V_f1Interval) period carries out discharging and provides the second driving voltage to a LED group 410。But the invention is not limited in described embodiment, when the LED light device 1000 according to the present invention comprises a LED group 410 to 4 LED groups of the 4th LED group (not shown), loopback compensation section 300 can also at the 4th operating range (that is, commutating voltage V_recVoltage level be the 4th forward voltage level V_f4Above interval) period be charged。In addition, similarly, when the LED light device 1000 according to the present invention includes n LED group of a LED group 410 to the n-th LED group (not shown), it is necessary to notice that loopback compensation section 300 can also at the n-th operating range (that is, commutating voltage V_recVoltage level be the n-th forward voltage level V_fnAbove interval) period be charged。

It addition, the forward voltage level compensated by the loopback compensation section 300 according to the present invention can according to energy charge/discharge unit (such as, the first capacitor C of Fig. 4 constituting loopback compensation section 300₁Deng) capacity and be designed to various form。For an embodiment, can meet according to the composition of the loopback compensation section 300 of the present invention: can compensate for the voltage level of 1/2nd (1/2) of total forward voltage level (voltage level addition of the forward voltage level of all LED groups obtained)。Therefore, the forward voltage level of the oneth LED group 410 is designed to the forward voltage level below example of the 2nd LED group 420, can meet according to the composition of the loopback compensation section 300 of the present invention: can compensate interval in supply the first forward voltage level V_f1Voltage。In the case, as it has been described above, a LED group 410 can independently remain closure state with the cycle of alternating current power supply。

Additionally, contrary with can meet the LED drive control part 500 being sequentially driven that can utilize driving voltage detection mode and control between multiple LED group according to the composition of prior art as shown in Figure 2, can meet according to the composition of the LED drive control part 500 of the present invention: the LED drive current I of LED illuminating part 400 can be detected_LEDOr it is connected to (multiple) constant current switch SW of LED illuminating part 400₁～SW₃LED drive current I_LED, and based on detected LED drive current I_LEDControl being sequentially driven of a LED group 410 and the 2nd LED group 420。It should be noted, however, that it is can also be applied to driving voltage detection mode can be utilized and controls the LED light device being sequentially driven between multiple LED group。

More specifically, for the LED light device according to the present invention, according to the LED drive control part 500 of the present invention in order to the first constant current switch SW can be included by the control being sequentially driven driving current detecting mode as above₁, the second constant current switch SW₂And the 3rd constant current switch SW₃。Fig. 4 has illustrated the first constant current switch SW₁To the 3rd constant current switch SW₃It is embodied in the embodiment of the outside of LED drive control part 500 as independent switch, but those skilled in the art are it is clearly understood that the first constant current switch SW₁To the 3rd constant current switch SW₃Can also reside in LED drive control part 500。

It addition, the first constant current switch SW according to the present invention₁To the 3rd constant current switch SW₃Each constitute and can meet following function: close according to the control of LED drive control part 500, thus connecting current path, or disconnect and separate current path, and the LED drive current I detecting the current path by being connected to and flowing_LED, thus by LED drive current I_LEDCurrent constant control is value set in advance。Specifically, as shown in Figure 4, the first constant current switch SW₁Between node and LED drive control part 500 between the first LED group 410 and the 2nd LED group 420, such that it is able to perform to connect the first current path P according to the control of LED drive control part 500₁Or separate the first current path P₁Function。Similarly, the second constant current switch SW₂Between the second LED group 420 and LED drive control part 500, thus performing according to the control of LED drive control part 500 the second current path P₂The function being attached or separating。It addition, the 3rd constant current switch SW₃Between loopback compensation section 300 and LED drive control part 500, thus performing connect according to the control of LED drive control part 500 or separate the 3rd current path P₃Function。For the present invention, the first constant current switch SW according to the present invention as above₁To the 3rd constant current switch SW₃Various known technology can be utilized to realize。Such as, with current constant control function as above relatively, the first constant current switch SW according to the present invention₁To the 3rd constant current switch SW₃Control respectively: detection resistance, be used for detecting electric current；Automatic amplifier, for standard of comparison current value and currently detected current value；Switch element, is controlled the connection in path, and can will be controlled as constant current by the LED drive current value in path when path is connected according to the output of automatic amplifier。It addition, as an example, composition the first constant current switch SW according to the present invention₁To the 3rd constant current switch SW₃Switch element one in following unit can be utilized to realize: metal-oxide semiconductor field-effect transistor (MOSFET)；Igbt (IGBT)；Bipolar junction transistor (BJT)；Junction field effect transistor (JFET)；IGCT (Siliconcontrolledrectifier)；Triode ac switch (Triac)。

The LED drive control part 500 of the present invention as shown in Figure 4 is constituted as follows: detection LED drive current I_LED, according to detected LED drive current I_LEDAnd control the first constant current switch SW as above₁To the 3rd constant current switch SW₃, thus controlling being sequentially driven of a LED group 410 and the 2nd LED group 420。The detailed function of such LED drive control part 500 will be carried out concrete discussion hereinafter with reference to Fig. 5 to Fig. 6。

Fig. 5 a to Fig. 5 d is the composition module map of the switching control state by operating range of the LED light device of the 1st embodiment illustrating the present invention as shown in Figure 4 and LED drive current。Hereinafter, the operating process of the LED light device 1000 of the 1st embodiment according to the present invention as shown in Figure 4 is carried out detailed discussion by reference Fig. 5 a to Fig. 5 d。

First, Fig. 5 a illustrates the first constant current switch SW during the first operating range₁To the 3rd constant current switch SW₃Controlled state and LED drive current I_LEDBetween relation。As it is shown in figure 5, during the first operating range, the first constant current switch SW₁And the second constant current switch SW₂For closure state, and the 3rd constant current switch SW₃For off-state。For the LED light device according to the present invention, the driving voltage supplied to LED illuminating part (non-compensate interval in the first driving voltage (commutating voltage V for being provided by rectification part_rec), compensate interval in the second driving voltage for being provided by loopback compensation section 300) the forward voltage level that voltage level is a LED group 410, that is, time point more than first forward voltage level begins at flowing LED drive current I in a LED group 410_LED, and accordingly, a LED group 410 will be lit。Now, the LED drive current I flowed by a LED group 410_LEDBy the first constant current switch SW₁Current constant control is the first LED drive current I set in advance_LED1Value。

Then, Fig. 5 b illustrates the first constant current switch SW during the second operating range₁To the 3rd constant current switch SW₃Controlled state and LED drive current I_LEDRelation。When being illustrated in Fig. 5 a, the voltage level that the forward voltage level of forward voltage level and the 2nd LED group 420 that the driving voltage supplied from LED illuminating part 400 rises to a LED group 410 constantly is added and obtains, that is, the second forward voltage level V_f2Above time point starts, and the 2nd LED group 420 also begins to logical LED drive current, and the 2nd LED group 420 is also lighted therewith。As it has been described above, during the first operating range, for the 2nd LED group 420 is passed through the second current path P₂And it is connected to the second constant current switch SW of LED drive control part 500₂For closure state, and can detect accordingly by the second constant current switch SW₂And the LED drive current I flowed_LED。LED drive control part 500 detects by the second constant current switch SW₂And the LED drive current I flowed_LED, and judge by the second constant current switch SW₂And the LED drive current I flowed_LEDWhether experience transient state (state of electric current rising and/decline) and normally keep constant current state。By the second constant current switch SW₂And the LED drive current I flowed_LEDWhen keeping normal constant current state, i.e. with the second LED drive current I set in advance_LED2When value stabilization ground keeps, LED drive control part 500 judges that (namely supply fully can drive a LED group 410 and the 2nd LED group 420 to the driving voltage of LED illuminating part 400, the voltage level being judged as driving voltage is more than the second forward voltage level), thus disconnecting the first constant current switch SW₁, and enter the second operating range。Meanwhile, LED drive control part 500 closes the 3rd constant current switch SW₃And connect the 3rd current path P₃, and start detection by the 3rd constant current switch SW₃And the loopback compensation section charging current I flowed_c。The first constant current switch SW on the time point entering the second operating range₁And the second constant current switch SW₂Controlled state and LED drive current I_LEDGraph of a relation be shown in Fig. 5 b。

It addition, the 2nd LED group 420 is luminous together with a LED group 410 during the second above-mentioned operating range, therefore, compared with the first operating range, the number of LED luminous during the second operating range will increase。Therefore, in order to make the light output of LED illuminating part 400 be held essentially constant during the first operating range and the second operating range, the second LED drive current I_LED2Can set that as lower than the first LED drive current I_LED1Value。It is further preferable that the second LED drive current I_LED2With the first LED drive current I_LED1Between the setting of relation can meet: inverse relations can be set up with the number carrying out luminous LED by operating range and realize exporting by the light of operating range almost becoming identical。

Then, Fig. 5 c illustrates the first constant current switch SW₁To the 3rd constant current switch SW₃Controlled state and LED drive current I_LEDBetween relation。As shown in Figure 5 b, LED drive control part 500 detects charging current I during the second operating range_c, and, LED drive control part 500 gradually rises up to charging current I at commutating voltage_cReach the time point of predetermined value set in advance disconnects the second constant current switch SW₂, hence into charging interval。The composition module map of above-mentioned state is illustrated in Fig. 5 c。As shown in Figure 5 c, the second constant current switch SW in charging interval₂For disconnect state, therefore, the 3rd LED drive current I_LED3By the 3rd current path P₃And flowed by a LED group 410 and loopback compensation section 300。Therefore, period between above-mentioned charging zone, only a LED group is luminous, and the 2nd LED group 420 is extinguished。LED drive control part 500 detects in order by the 3rd current path P in charging interval₃And the 3rd LED drive current I flowed_LED3。

It addition, at commutating voltage V_recIt is gradually decrease to by the 3rd current path P after arriving maximal voltage level₃The 3rd LED drive current I_LED3When being down to below value set in advance, LED drive control part 500 controls the first constant current switch SW with the state being illustrated in Fig. 5 b₁To the 3rd constant current switch SW₃, thus returning to the second operating range。That is, LED drive control part 500 disconnects the 3rd constant current switch SW₃, and close the second constant current switch SW₂。Therefore, as it has been described above, during the second operating range, a LED group 410 and the 2nd LED group all can be luminous, and now, LED drive current I_LEDIt is the second LED drive current I by current constant control_LED2Value。

Continue to be decreased to less than the second forward voltage level V at constant current voltage_f2Time, LED drive control part 400 controls the first constant current switch SW with the state being illustrated in Fig. 5 b₁To the 3rd constant current switch SW₃, thus returning to the first operating range。As it has been described above, only a LED group meeting 410 is luminous during the first operating range, and the 2nd LED group 420 is extinguished。It addition, now, LED drive current I_LEDIt is the first LED drive current I by current constant control_LED1Value。

Then, at commutating voltage V_recIt is decreased to less than the first forward voltage level V_f1Time, LED drive control part 500 controls the first constant current switch SW1 to the 3rd constant current switch SW3 with the state being illustrated in Fig. 5 d, hence into compensating interval。By comparison diagram 5a and Fig. 5 d it can be seen that the controlled state of the constant current switch of Fig. 5 a is identical with the controlled state of the constant current switch of Fig. 5 d。Therefore, the control of constant current switch can not occurring substantially, its meeting supplies the second driving voltage from loopback compensation section 300 to a LED illuminating part 400 naturally because of potential difference。Therefore, period between compensating basin, it is possible to from loopback compensation section 300 to LED group 410 offer second driving voltage, and accordingly, it is possible to the 4th LED drive current I that flows by the first current path_LED4, and keep the illuminating state of a LED group 410。Now, the 4th LED drive current I_LED4Substantially can with the first LED drive current I_LED1Identical。

As it has been described above, commutating voltage V_recA cycle in sequentially perform the first operating range, the second operating range, charging interval, the second operating range, the first operating range, compensate the control in interval, and at commutating voltage V_recEach cycle periodically repeatedly perform above-mentioned control。

Fig. 6 is the oscillogram of the light output relation illustrating the commutating voltage temporally of LED light device of the 1st embodiment according to the present invention as shown in Figure 4, LED drive current, input current and LED illuminating part。(a) of Fig. 6 represents time dependent commutating voltage V_recWaveform, (b) of Fig. 6 represents time dependent LED drive current I_LEDWaveform, and (c) of Fig. 6 represents time dependent from alternating current power supply V_acIt is input to the input current I of LED light device_inWaveform, (d) of Fig. 6 represents the optical output waveform of time dependent LED illuminating part 400。

With reference to Fig. 6, if being first begin to start LED light device 1000, then because loopback compensation section 300 does not fill electricity with, therefore LED illuminating part 400 can not be luminous。Oneth LED group 410 is at commutating voltage V_recVoltage level over time pass through the first forward voltage level V_f1Time point on light。And state diagram now is shown in Fig. 5 a。

At commutating voltage V_recVoltage level continue rise and arrive the second forward voltage level V_f2Time (t₂), LED drive control part 500 closes the second constant current switch SW₂And the 3rd constant current switch SW₃, and disconnect the first constant current switch SW₁, hence into the second operating range。This state diagram is shown in Fig. 5 b。In the second operating range, a LED group and the 2nd LED group 420 are all lighted, and as it has been described above, the second LED drive current I during the second operating range_LED2It is preferably configured as lower than the first LED drive current I_LED1Value and by current constant control。Certainly, art technology high-ranking official is clearly understood that the first LED drive current I_LED1And the second LED drive current I_LED2Identical value can be set to according to demand。And according to embodiment, the second LED drive current I_LED2Can be set to be higher than the first LED drive current I_LED1Value。Therefore, as shown in (d) of Fig. 6, the light output of the LED illuminating part 400 during the second operating range can be almost identical with the light output of the LED illuminating part 400 during the first operating range。It addition, as it has been described above, during the second operating range, LED drive control part 500 is in and continues to detect whether by the 3rd constant current switch SW₃And the charging current I that flows_cState。

At commutating voltage V_recVoltage level continue rise and reach stably to supply charging current I to loopback compensation section 300_cTime point time (t₃), LED drive control part 500 is by disconnecting the second constant current switch SW₂And enter charging interval。As shown in Figure 5 c, in above-mentioned charging interval, only a LED group 410 is luminous, and loopback compensation section 300 is electrically charged。Now, by the LED drive current I of a LED group 410 and loopback compensation section 300_LEDCan be by the 3rd constant current switch SW by current constant control₃Carry out the 3rd LED drive current value I set in advance_LED3, and according to embodiment, the first LED drive current I_LED1Value and the 3rd LED drive current I_LED3Value can be set to identical value。Its object is to reduce by the light output bias of operating range。

Arrive commutating voltage V_recVoltage level decline through peak and reach stably to supply to loopback compensation section 300 time point (the t of charging current₄), LED drive control part 500 closes the second constant current switch SW as shown in Figure 5 b₂, hence into the second operating range。

Then, at commutating voltage V_recVoltage level decline and be less than the second forward voltage level V_f ₂Time (t₅), LED drive control part 500 closes the first constant current switch SW as shown in Figure 5 a₁, and disconnect the 3rd constant current switch SW₃, hence into the first operating range。Now, LED drive control part 500 is by detecting the second LED drive current I_LED2And determine commutating voltage V_recVoltage level whether less than the second forward voltage level V_f2。That is, its composition can meet: at the second LED drive current I detected_LED2When being down to below value set in advance, it is possible to be judged as commutating voltage V_recVoltage level less than the second forward voltage level。

At commutating voltage V_recVoltage level continue to deteriorate to less than the first forward voltage level V_f1Time (t₆), it is possible to supply the second driving voltage to a LED group 410 from loopback compensation section 300 as fig 5d, thus a LED group 410 can be luminous。As set forth above, it is possible to individually constant current switch is not performed control at above-mentioned time point, and can naturally be performed the process discharged from loopback compensation section 300 to a LED group 410 by potential difference。

At commutating voltage V_recVoltage level again rise to the first forward voltage level V_f1(t time above₈), a LED group 410 can re-start as shown in Figure 5 a according to commutating voltage V_recAnd carry out the process of luminescence。Control process sequentially as above is at commutating voltage V_recEach cycle all can periodically repeatedly。

It addition, be can confirm that by (d) of Fig. 6, LED illuminating part 400 is at commutating voltage V_recAll intervals in keep the output of constant light。This can be by the second operating range during the second LED drive current I_LED2Control as lower than the first LED drive current I_LED1Value and the effect reached。

Above, in order to the convenience with example is described, the embodiment become by a LED group 410 and the 2nd LED group 420 the two LED fabric with LED illuminating part 400 is as the criterion and is illustrated, but those skilled in the art are it is clearly understood that identical mode can be applied in the embodiment that LED illuminating part 400 is become by 3 or 4 or LED fabric above, but also it is appreciated that the above embodiments belong in scope of the presently claimed invention。

The composition of the 2nd embodiment of LED light device 1000 and function

Fig. 7 is the composition module map schematically of the LED light device of the 2nd embodiment according to the present invention, and Fig. 8 a to Fig. 8 e is the composition module map of the expression switching control state by operating range according to the LED light device of the 2nd embodiment of the present invention as shown in Figure 7 and LED drive current。Hereinafter, with reference to Fig. 7 and Fig. 8 a to Fig. 8 e, composition and function to the LED light device 1000 of the 2nd embodiment according to the present invention carries out detailed discussion。

The LED light device 1000 of the 2nd embodiment according to the present invention as shown in Figure 7 is except possessing the 4th switch SW between node and the loopback compensation section 300 between a LED group 410 and the 2nd LED group 420₄Point beyond, similar with the composition of the LED light device 1000 according to the 1st embodiment as shown in Figure 4。Therefore, the composition of repetition and function can refer to Fig. 4 explanation carried out, and based on the difference between the 1st embodiment, the LED light device 1000 of the 2nd embodiment according to the present invention inquired into below。

First, the 4th switch SW as shown in Figure 7₄May be used for the control according to drive control part 500 and control loop returns the charge and discharge process of compensation section 300 meticulously。

Specifically, within the first operating range, the 4th switch SW₄Remain off as shown in Figure 8 a。Therefore, within the first operating range, electric current will not flow loopback compensation section 300。

Then, as shown in Figure 8 b, the 4th switch SW₄Guan Bi on the time point entering the second operating range, thus the current path connected between rectification part 200 and loopback compensation section 300, and charging current I_cLoopback compensation section 300 can be flowed by above-mentioned current path。

Then, as shown in Figure 8 c, the 4th switch SW₄Loopback compensation section 300 entering, the time point that charging is interval can also maintain closure state, so that can pass through charging current I_cCharging。

And then, the 4th switch SW₄Entering from charging interval, the time point of the second operating range is also kept closed as shown in Figure 8 b。Then, on the time point entering the first operating range from the second operating range, the 4th switch SW₄It is disconnected as shown in Figure 8 a。

It addition, at commutating voltage V_recVoltage level be decreased to less than the first forward voltage level V_f1Time, enter according to the LED light device 1000 of the 2nd embodiment and compensate interval。Compensating within interval, the 4th switch SW₄Also remain off。Fig. 8 d and Fig. 8 e illustrates the first constant current switch SW between compensating basin in the LED light device 1000 of period₁SW is switched to the 4th₄Controlled state。

It is noted that the second operating range and the first operating range differently can all be compensated by loopback compensation section the 300 and the 1st embodiment of the 2nd embodiment according to the present invention。Specifically, at the V of commutating voltage_recVoltage level be down to the first forward voltage level V_f1Time, the second driving voltage is supplied to LED group 410 and a 2nd LED group 420 from loopback compensation section 300 because of potential difference。Therefore, at this moment, as shown in figure 8d, the first constant current switch SW₁Disconnect, and the second constant current switch SW₂It is kept closed。Now, it will flowing the 4th LED drive current I_LED4, and the 4th LED drive current I_LED4It is predetermined value by the second constant current switch SW2 by current constant control。4th LED drive current I_LED4Can be set to and the second LED drive current I_LED2Identical value。

It addition, process in time, in the second driving voltage decline supplied by loopback compensation section 300 less than the second forward voltage level V_f2Time, the 4th LED drive current I_LED4Below value set in advance can be down to, and on above-mentioned time point, LED drive control part 500 closes the first constant current switch SW₁。Therefore, during above-mentioned interval, only a LED group 410 can be luminous, and the 5th LED drive current I now flowed_LED5By the first constant current switch SW₁Carrying out current constant control is value set in advance。5th LED drive current I_LED5Can be set to and the first LED drive current I_LED1Identical value。

When again reaching commutating voltage V_recVoltage level rise and arrive the first forward voltage level V_f1Time point time, LED light device 1000 becomes the state of Fig. 8 a。As it has been described above, the controlled state that the controlled state of the last constant current switch compensated in interval drives the constant current switch in interval with first is identical, therefore it is not required to individually constant current switch is controlled。

The composition of the 3rd embodiment of LED light device 1000 and function

Fig. 9 is the composition module map schematically of the LED light device of the 3rd embodiment according to the present invention。With reference to Fig. 9, composition and function to the LED light device of the 3rd embodiment according to the present invention carry out detailed discussion。

The LED light device 1000 of the 3rd embodiment according to the present invention as shown in Figure 9 except possessing the point of the second compensation section 310 side by side with the 2nd LED group 420, and it constitutes similar with the composition of the LED light device 1000 according to the 1st embodiment as shown in Figure 4。Therefore, the composition of repetition and function can refer to Fig. 4 explanation carried out, and based on the difference between the 1st embodiment, the LED light device 1000 of the 3rd embodiment according to the present invention inquired into below。

As it is shown in figure 9, the second compensation section 310 according to the present invention can by the second capacitor C₂Realizing, but be not limited thereto, it can also utilize various electrical charge/discharge unit and/or electrical charge-discharge circuit to realize。Second compensation section 310 is charged during the second operating range as above, and operating range (that is, the operating range that the 2nd LED group 420 is extinguished) period beyond the second operating range can perform to supply the function of the second driving voltage to the 2nd LED group 420。Accordingly, the situation for the 3rd embodiment as shown in Figure 9, runs through commutating voltage V_recAll intervals, a LED group 410 and the 2nd LED group 420 can remain illuminating state。

The composition of the 4th embodiment of LED light device 1000 and function

Figure 10 is the composition module map schematically of the LED light device of the 4th embodiment according to the present invention。With reference to Figure 10, composition and function to the LED light device of the 4th embodiment according to the present invention carry out detailed discussion。

The LED light device of the 4th embodiment according to the present invention as shown in Figure 10 can also include: the first LED drive current configuration part 610, for by the first LED drive current I_LED1It is set as required value；Second LED drive current configuration part 620, for by the second LED drive current I_LED2It is set as required value；3rd LED drive current configuration part 630, for by the 3rd LED drive current I_LED3It is set as required value。Except these points, it is similar with the composition of the LED light device of the 1st embodiment illustrated in Fig. 4。Therefore, the composition of repetition and function can refer to Fig. 4 explanation carried out, and based on the difference between the 1st embodiment, the LED light device 1000 of the 4th embodiment according to the present invention inquired into below。

To the illuminator 1000 according to prior art illustrated with reference to Fig. 2 and Fig. 3, there is one and can not set the first LED drive current I respectively_LED1, the second LED drive current I_LED2, the 3rd LED drive current I_LED3, the 4th LED drive current I_LED4Problem points。That is, for the LED light device 1000 according to prior art, its form is staircase waveform form, it is possible to control by the LED drive current I of each operating range_LED, therefore in general, it can set that LED drive current (such as, a 4th LED drive current I_LED4), and controlled other LED driving interval by the ratio of set LED drive current。Such as, adopt the 3rd LED drive current I_LED3It is set as the 4th LED drive current I_LED480～90%, by the second LED drive current I_LED2It is set as the 4th LED drive current I_LED465～80%, and by the first LED drive current I_LED1It is set as the 4th LED drive current I_LED430～65% mode。But, this LED light device 100 according to prior art exists and only can not set each LED drive current I individually_LEDProblem points, its difficult point in particular, in that, for improving scintillation properties, do not adopt the mode being scaled LED drive current as above, but at random set LED drive current by operating range。Therefore, LED light device 1000 for the 4th embodiment according to the present invention, it separately possesses the 610, second LED drive current configuration part, the first LED drive current configuration part 620 and the 3rd LED drive current configuration part, such that it is able to set each LED drive current according to demand。The embodiment that Figure 10 illustrates above-mentioned the 610, second LED drive current configuration part 620, the first LED drive current configuration part and the 3rd LED drive current configuration part 630 is utilized respectively variable resistance and realizes, but those skilled in the art all can be clearly understood that driving current settings portion can be realized by other suitable unit (such as, capacitor etc.) or other suitable circuit。

The composition of the 5th embodiment of LED light device 1000 and function

Figure 11 is the composition module map schematically of the LED light device of the 5th embodiment according to the present invention, and the composition module map of the switching control state by operating range of the LED light device that Figure 12 a to Figure 12 c is the 5th embodiment according to the present invention as shown in figure 11 and LED drive current。It addition, Figure 13 indicates that the oscillogram of the light output relation of the commutating voltage temporally of LED light device of the 5th embodiment according to the present invention as shown in figure 11, LED drive current, input current and LED illuminating part。Hereinafter, with reference to Figure 11 to Figure 13, composition and function to the LED light device 1000 of the 5th embodiment according to the present invention carries out detailed discussion。

First, the LED light device 100 of the 5th embodiment according to the present invention identical with the LED light device 1000 of the 1st embodiment as described above to the 4th embodiment carry out the point of 2 step operations exists similar in, but it is sequentially driven not performing, and performs to deform on the point being sequentially driven and there are differences。In the ordinary course of things, " it is sequentially driven " and refers to commutating voltage V_recA cycle be standard, according to commutating voltage V_recVoltage level and change the type of drive of operating range according to the order of " 1 step operating range (discharge range) → 1 step operating range (non-compensation interval) → 2 step operating ranges (charging interval) → 1 step operating range (non-compensation is interval) → 1 step operating range (discharge range) "。On the contrary, according to the LED light device 1000 of the 5th embodiment of the present invention with commutating voltage V_recA cycle be standard, voltage level according to commutating voltage and change operating range with the order of " 2 step operating range (discharge range) → 2 step operating ranges (non-compensation is interval) → 1 step operating range (charging interval) → 2 step operating ranges (non-compensation is interval) → 2 operating ranges (discharge range) ", and be referred to as deformation and be sequentially driven mode。That is, in relatively low voltage level interval, have more LED group in luminescence, and in of a relatively high voltage level interval, have less LED group in luminescence, and simultaneously, loopback compensation section 300 is charged。It addition, for embodiment as above, as the charging interval entrance voltage level V entering and departing from the interval standard of charging_chargeHigher than the second forward voltage level V_f2。For the above embodiments, loopback compensation section 300 can be chosen and perform the compensation to the second forward voltage level。That is, the capacity of loopback compensation section 300 can be identified as and supplies the second driving voltage to a LED group 410 and the 2nd LED group 420 in compensation is interval。

LED light device for the 5th embodiment according to the present invention, in order to perform function as above, loopback compensation section 300 can node between the first LED group 410 and the 2nd LED group 420 and the first constant current switch SW as illustrated in fig. 11₁Between, thus being charged during 1 step operating range, it is possible to supply threeth LED drive current I by discharge path to a LED group 410 and the 2nd LED group 420 non-compensation in interval_LED3。

It addition, in order to perform function as above, according to the LED drive control part 500 of the 5th embodiment of the present invention according to commutating voltage V_recVoltage level and control the first constant current switch SW₁And the second constant current switch SW₂Such that it is able to the deformation controlling a LED group 410 and the 2nd LED group 420 is sequentially driven。Above-mentioned to the first constant current switch SW₁And the second constant current switch SW₂Control can based on driving voltage detection mode as above or drive a kind of mode in current detecting mode to perform。Hereinafter, with reference to Figure 12 a to Figure 12 c and Figure 13, the control process that drives of the LED light device 1000 of the 5th embodiment according to the present invention is carried out concrete discussion。

First, on the time point that the LED light device 100 of the 5th embodiment according to the present invention starts, as figure 12 a shows, the second constant current switch SW₂For closure state, the first constant current switch SW₁For off-state。When starting LED light device 1000, as shown in figure 13, at commutating voltage V_recVoltage level reach the second forward voltage level V_f2Will not be flowed LED drive current before, and from commutating voltage V_recVoltage level reach the time point t of the second forward voltage level₁Begin through the second current path P₂And the second LED drive current I that flows_LED2。Above-mentioned state diagram is shown in Figure 12 a。Now, the LED drive current I flowed by a LED group 410 and the 2nd LED group 420_LEDCan by the second constant current switch SW₂Carrying out current constant control is the second LED drive current I set in advance_LED2Value。

It addition, as shown in figure 13, voltage level over time through and rise and reach the interval entrance voltage level V that charges_chargeTime (t₂), LED drive control part 500 disconnects the second constant current switch SW₂, and close the first constant current switch SW₁, hence into charging interval。At this, charging interval enters voltage level V_chargeRefer to mutually form when being connected in series in a LED group 410 and loopback compensation section 300 start the charging current I that flows_cCritical voltage level。The composition module map of above-mentioned state is illustrated in Figure 12 b。As shown in Figure 12b, in charging interval, the second constant current switch SW₂For off-state, therefore the first LED drive current I_LED1The first current path P can be passed through₁And flowed by a LED group 410 and loopback compensation section 300。Therefore, period between above-mentioned charging zone, only a LED group 410 is luminous, and the 2nd LED group is extinguished。LED drive control part 500 detects the first LED drive current I flowed by the first current path P1 in charging is interval constantly_LED1, thus being the first LED drive current I set in advance by its current constant control_LED1。

It addition, because during the first operating range, only a LED group 410 is in luminescence, therefore, compared with the number of LED luminous during the second operating range, the number minimizing of LED luminous during the first operating range。Therefore, in order to make the light output of LED illuminating part 400 keep nearly constant during the first operating range and the second operating range, the second LED drive current I_LED2The first LED drive current I can be set below_LED1Value。More preferably, it is possible to by the first LED drive current I_LED1With the second LED drive current I_LED2Between relation be set as: can by with the inversely proportional relation of number form carrying out luminous LED by operating range and make to export by the light of operating range almost to become identical。Therefore, as confirmed ground from (e) of Figure 13, running through whole interval, the light output of the illuminator 1000 of LED can keep constant。

As shown in figure 13, at commutating voltage V_recIn time through and be gradually reduced to after reaching maximal voltage level and enter voltage level V less than charging interval_chargeTime (t₃), LED drive control part 500 is judged as that it is departing from charging interval (that is, the first operating range), it is possible to again control the 1st constant current switch SW with the state illustrated in Figure 12 a₁And the second constant current switch SW₂, thus returning to the second operating range。That is, LED drive control part 500 disconnects the first constant current switch SW₁, and close the second constant current switch SW₂。

As shown in figure 13, at commutating voltage V_recOver time through and continue to be decreased to less than the second forward voltage level V_f2Time (t₄), LED drive control part 500 controls the first constant current switch SW with state as shown in fig. 12 c₁And the second constant current switch SW₂, hence into compensating interval。By comparison diagram 12a and Figure 12 c it can be seen that the controlled state of the constant current switch of Figure 12 a is identical with the controlled state of the constant current switch of Figure 12 c。Therefore, substantially can not there is the control of constant current switch, and simply the second driving voltage is supplied to the 2nd LED group 420 by discharge path by loopback compensation section 300 naturally because of potential difference。Therefore, period between compensating basin, the second driving voltage provides to LED group 410 and a 2nd LED group 420 from loopback compensation section 300, and accordingly, the 3rd LED drive current I that flows by the second current path_LED3, and keep the illuminating state of a LED group 410 and the 2nd LED group 420。Now, the 3rd LED drive current I_LED3Substantially can with the second LED drive current I_LED2Identical。

As above inquired into, the LED light device 1000 for the 5th embodiment according to the present invention, the commutating voltage V after initial starting up_recA cycle in, perform the control to " 2 step operating range (discharge range) → 2 step operating ranges (non-compensation is interval) → 1 step operating range (charging interval) → 2 step operating ranges (non-compensation is interval) → 2 step operating ranges (discharge range) " in order, and at commutating voltage V_recEach cycle all periodically repeatedly perform above-mentioned control。

When utilizing LED light device 1000 of the 5th embodiment according to the present invention as described above, compared with the 1st above-mentioned embodiment to the 4th embodiment, following effect can be brought: (i) period all of LED group can be luminous between compensating basin, therefore optical uniformity can be promoted, (ii) electrical characteristics (power factor, total harmonic distortion etc.) promote, (iii) quantity of constant current switch reduces, therefore circuit design is easier to, and can reduce manufacture unit price。

The composition of the sixth embodiment of LED light device 1000 and function

Figure 14 is the composition module map schematically of the improved LED light device of scintillation properties according to the sixth embodiment of the invention (following, to be referred to as " LED light device ")。Hereinafter, with reference to Figure 14, the composition of the LED light device according to the present invention and function are carried out brief discussion。

The difference between LED light device in LED light device 1000 according to the sixth embodiment of the present invention as shown in figure 14 and the 1st embodiment as shown in Figure 4 is in that: it is not that the other end of loopback compensation section 300 is by independent constant current switch (such as, the 3rd constant current switch SW in Fig. 3₃) and be connected to LED drive control part, but with the n-th LED group (such as, 2LED group 420 as shown in figure 14) negative pole end commonly by the n-th constant current switch (such as, the second constant current switch SW2 as shown in figure 14) and it is connected to LED drive control part 500, in addition substantially similar with the composition of the LED light device 1000 of the 1st embodiment illustrated in Fig. 4。Therefore, the composition of repetition and function can refer to Fig. 4 explanation carried out, and based on the difference between the 1st embodiment, the LED light device 1000 of the 6th embodiment according to the present invention inquired into below。

As shown in figure 14, rectification part 200, loopback compensation section 300, LED illuminating part 400 and LED drive control part 500 can be comprised according to the LED light device of the present invention。It addition, in above-mentioned element, it is possible to constituted LED drive circuit by loopback compensation section 300 and LED drive control part 500。

First, with first embodiment similarly, comprise the LED illuminating part of a LED group 410 and the 2nd LED group 420 disclosed in Figure 14, but those skilled in the art all can be clearly understood that and according to demand the number of the LED group being included in LED illuminating part 400 can be carried out various change。But, below, the embodiment become by two LED fabric with LED illuminating part 400 for the convenience that illustrates and understand is as the criterion and illustrates, but the invention is not limited in this。It addition, for the preferred embodiment of the invention, the design of a LED group 410 needs to meet: have the forward voltage level that can be driven by the second driving voltage supplied in compensating interval by loopback compensation section 300。For an exemplary embodiment, the composition of a LED group 410 can meet: the peak value V of commutating voltage_{rec_peak}It it is more than the twice of forward voltage level of a LED group 410。When designing as described above, a LED group 410 is at alternating voltage V_ACComplete period in remain closure state。

It addition, the loopback compensation section 300 according to the present invention is constituted as follows: utilize commutating voltage V in charging interval_recAnd fill energy, and provide the second driving voltage compensating in interval to LED illuminating part 400。In example as shown in figure 14, it is connected in parallel in the 2nd LED group 420 according to the loopback compensation section of the present invention and is charged in the second operating range。Specifically, as shown in figure 14, one end of loopback compensation section 300 is connected to the node (that is, the negative pole end of a LED group) between a LED group 410 and the 2nd LED group 420 by charge path, and is additionally coupled to the positive terminal of a LED group 410 by discharge path。The other end of loopback compensation section 300 and the negative pole end of the 2nd LED group 420 are connected jointly to the second constant current switch SW₂。Certainly, the composition according to embodiment, one end of loopback compensation section 300 is also connected to the positive terminal of other LED groups。Such as, for the embodiment being become LED illuminating part 400 by 4 LED fabric, it is possible to make one end of loopback compensation section 300 be connected to the positive terminal of the 2nd LED group。In the case, loopback compensation section 300 compensate interval in can supply the second driving voltage to the 2nd LED group (or the 2nd LED group to the 3rd LED group etc.)。Hereinafter, can be as the criterion to the embodiment of first LED group 410 supply the second driving voltage in compensation is interval so that one end of loopback compensation section 300 is connected to the positive terminal of a LED group 410 and illustrate。

It addition, above-mentioned loopback compensation section 300 is connected to the negative pole end of a LED group 410 because of its one end by charge path, therefore it is at the second operating range (that is, commutating voltage V_recVoltage level be the second forward voltage level V_f2Above interval) in be charged, and its one end is connected to the positive terminal of a LED group 410 by discharge path, and therefore, it is constituted as follows: (that is, commutating voltage V between non-light-emitting area_recVoltage level less than the interval of the first forward voltage level) electric discharge and the second driving voltage can being provided to a LED group 410。Namely, for according to the sixth embodiment of the invention, loopback compensation section 300 is charging during loopback compensation section 300 forms the operating range of (multiple) the LED group being connected in parallel, and can by the second driving voltage supply to (multiple) the LED group becoming target compensation between interval compensating。Accordingly, it is preferable that it is constituted as follows: the forward voltage level of (multiple) LED group that loopback compensation section 300 is connected in parallel is more than the forward voltage level of (multiple) the LED group receiving the second driving voltage。

That is, for the 6th embodiment as shown in figure 14, the forward voltage level of a LED group 410 preferably meets identical with the forward voltage level of the 2nd LED group 420 or less than this composition。Only the invention is not limited in the above embodiments, when the LED light device 1000 according to the present invention includes a LED group 410 to 4 LED groups of the 4th LED group (not shown), loopback compensation section 300 can also be connected in parallel in the 4th LED group and at the 4th operating range (that is, commutating voltage V_recVoltage level be the 4th forward voltage level V_f4Above interval) in be charged。Additionally, similarly, when the LED light device 1000 according to the present invention includes n LED group of a LED group 410 to the n-th LED group (not shown), should be noted that loopback compensation section 300 can also be connected in parallel in the n-th LED group and at the n-th operating range (that is, commutating voltage V_recVoltage level be the n-th forward voltage level V_fnAbove interval) period be charged。

It addition, the forward voltage level compensated by the loopback compensation section 300 according to the present invention can be designed as various form according to the capacity of energy charge/discharge unit (such as, the first capacitor C1 etc. of Figure 14) constituting loopback compensation section 300。For an embodiment, can meet according to the composition of the loopback compensation section 300 of the present invention: can compensate for the voltage level of 1/2nd of total forward voltage level (be all added by the forward voltage level of LED group and obtain voltage level)。Therefore, the forward voltage level of a LED group 410 is designed to the forward voltage level below example of the 2nd LED group 420, can meet according to the composition of the loopback compensation section 300 of the present invention: the first forward voltage level V can be supplied_f1Voltage。In the case, as it has been described above, a LED group 410 can independently remain closure state with the cycle of alternating current power supply。

It addition, the first constant current switch SW according to the present invention₁And the second constant current switch SW₂Following function can be performed: be closed according to the control of LED drive control part 500 and connect current path, or be disconnected and separate current path, and detect the LED drive current I flowed by current path_LED-, thus by LED drive current I_LEDCurrent constant control is the value set in advance。

The LED drive control part 500 of the present invention as shown in figure 14 is constituted as follows: detection LED drive current, according to detected LED drive current I_LEDAnd control the first constant current switch SW as above₁And the second constant current switch SW₂, thus controlling being sequentially driven of a LED group 410 and the 2nd LED group 420。The detailed function of above-mentioned LED drive control part 500 is carried out hereinafter with reference to Figure 15 to Figure 16 concrete discussion。

Figure 15 a to Figure 15 c is the composition module map of the expression switching control state by operating range according to the LED light device of the 6th embodiment of the present invention as shown in figure 14 and LED drive current。Hereinafter, with reference to Figure 15 a to Figure 15 c, the operating process of LED light device according to the sixth embodiment of the invention as shown in figure 14 is carried out detailed discussion。

First, Figure 15 a represents the first constant current switch SW during the first operating range₁And the second constant current source SW₂Controlled state and LED drive current I_LEDBetween relation。As shown in fig. 15 a, during the first operating range, the first constant current switch SW₁And the second constant current switch SW₂For closure state。For the LED light device 1000 according to the present invention, driving voltage from supply to LED illuminating part 400 (non-compensate interval in the first driving voltage (commutating voltage V for providing from rectification part 200_rec), compensate interval in the second driving voltage for providing from loopback compensation section 300) voltage level rise to the voltage level of a LED group 410, i.e. the first forward voltage level V_f1Above time point starts can at a LED group 410 flowing LED drive current I_LED, and accordingly, a LED group 410 is lit。Now, the LED drive current I flowed by a LED group 410_LEDCan be the first LED drive current I set in advance_LED1Value, it can by the first constant current switch SW₁Carry out current constant control。

Then, Figure 15 b represents the first constant current switch SW during the second operating range₁And second constant current switch controlled state and LED drive current between relation。Under controlled state as shown in fig. 15 a, more than the voltage level rising to the forward voltage level of a LED group 410 and the forward voltage level addition of the 2nd LED group 420 constantly at the driving voltage being fed to LED illuminating part 400 and obtain, that is, the second forward voltage level V is risen to_f2Above time point starts, and also flow in the 2nd LED group 420 LED drive current I_LED, and accordingly, the 2nd LED group 420 is also lighted。On above-mentioned time point, for by the second current path P₂And the 2nd LED group 420 is connected to the second constant current switch SW of LED drive control part 500₂It is in closure state, accordingly, it is possible to detect by the second constant current switch SW₂And the LED drive current I flowed_LED。LED drive control part 500 detects by the second constant current switch SW₂And the LED drive current I flowed_LED, and judge the LED drive current I flowed by the second constant current switch_LEDWhether experience transient state (state that electric current rises and/or declines) and normally keep constant current state。By the second constant current switch SW₂And the LED drive current I flowed_LEDWhen keeping normal constant current state, i.e. keep the second LED drive current I set in advance stably_LED2When, LED drive control part 500 may determine that the driving voltage supplied to LED illuminating part 400 can drive LED group 410 and a 2nd LED group 420 fully, thus closing the first constant current switch SW₁, and enter the second operating range。The first constant current switch SW on the time point entering the second operating range₁And the second constant current switch SW₂Controlled state and LED drive current I_LEDGraph of a relation be shown in Figure 15 b。

Additionally, when Figure 15 b, i.e. in the second operating range, oneth LED group 410 and the 2nd LED group 420 are all luminous, but the LED drive current flowed by a LED group 410 and the LED drive current flowed by the 2nd LED group 420 are mutually different。First, during the second operating range, supply the input current I to LED illuminating part 400 from rectification part 200_inFlowed by a LED group 410。But, as illustrated in fig. 15b, input current I_inAfter by a LED group 410, it is split up into charging current I_cWith the second LED drive current I_LED2。Charging current I_cCan supply and to loopback compensation section 300, loopback compensation section 300 is charged, and the second LED drive current I_LED2Supply is to the 2nd LED group 420, so that the 2nd LED group 420 is luminous。That is, the second LED drive current I to the 2nd LED group is supplied_LED2Can be input current I_inDeduct charging current I_cAnd the electric current obtained。As a result, for the LED light device 1000 according to the present invention, during the second operating range, while a LED group 410 and the 2nd LED group 420 are all luminous, loopback compensation section 300 is charged。It addition, during the second operating range, the light output of the 2nd LED group 420 gets lower than the light output of a LED group 410, such that it is able to bring the improved effect of light output bias。

It addition, during the second operating range, by the second constant current switch SW₂The electric current controlled can be " the second LED drive current I by current constant control_LED2+ charging current I_c", i.e. input current I_inIt is by the second constant current switch value set in advance by current constant control。

It addition, during the second above-mentioned operating range, the 2nd LED group 420 is luminous together with a LED group 410, therefore, compared with the first operating range, the quantity of LED luminous during the second operating range increases。Therefore, in order to make the light output of LED illuminating part 400 keep nearly constant during the first operating range and the second operating range, the second LED drive current I_LED2The first LED drive current I can be set below_LED1Value。It is further preferable that the second LED drive current I_LED2With the first LED drive current I_LED1Between the setting of relation can meet: and coming by operating range to set up inversely prroportional relationship between the number of luminous LED, almost becoming identical so that exporting by the light of operating range。

It addition, at commutating voltage V_recIt is gradually reduced after arriving maximal voltage level, thereby through the second current path P₂And the second LED drive current I flowed_LED2When being down to below value set in advance, LED drive control part 500 controls the first constant current switch SW with the state being illustrated in Figure 15 a₁And the second constant current switch SW₂, thus returning to the first operating range。That is, LED drive control part 500 closes the first constant current switch SW₁。Therefore, as it has been described above, only a LED group 410 can be luminous during the first operating range, and now LED drive current I_LEDCan be the second LED drive current I by current constant control_LED2Value。

At commutating voltage V_recContinue to be reduced to less than the first forward voltage level V_f1Time, LED drive control part 500 comes the first constant current switch SW with the state being illustrated in Figure 15 c₁And the second constant current switch SW₂It is controlled and enters compensation interval。By comparison diagram 15a and Figure 15 c it can be seen that the controlled state of the constant current switch of Figure 15 a is identical with the controlled state of the constant current switch of Figure 15 c。Therefore, substantially can not there is the control of constant current switch, and the second driving voltage is only supplied to a LED illuminating part 400 from loopback compensation section 300 because of potential difference。Therefore, period between compensating basin, the second driving voltage can provide to a LED group 410 from loopback compensation section 300, and accordingly, it is possible to the 3rd LED drive current I that flows by the first current path_LED3, and keep the illuminating state of a LED group 410。Now, the 3rd LED drive current I_LED3Substantially can with the first LED drive current I_LED1Identical。

As it has been described above, at commutating voltage V_recA cycle in perform the first operating range, the second operating range and charging interval, the first operating range in order, compensate the interval control carried out, and at commutating voltage V_recEach cycle in all periodically repeatedly perform above-mentioned control process。

Figure 16 indicates that the oscillogram of the light output relation of the commutating voltage temporally of LED light device of the 6th embodiment of the present invention illustrated in Figure 14, LED drive current, input current and LED illuminating part。(a) of Figure 16 represents time dependent commutating voltage V_recWaveform, (b) of Figure 16 represents time dependent LED drive current I_LEDWaveform, (c) of Figure 16 represents the charging current I of time dependent loopback compensation section 300_cAnd discharge current (that is, the 3rd LED drive current I_LED3) waveform, and (d) of Figure 16 represent over time from alternating current power supply V_acIt is input to the input current I of LED light device_inWaveform, and (e) of Figure 16 represents the optical output waveform of time dependent LED illuminating part 400。

With reference to Figure 16, if first starting LED light device 1000, because loopback compensation section 300 does not fill electricity with, therefore LED illuminating part 400 will not be luminous。Oneth LED group 410 over time through and at commutating voltage V_recVoltage level arrive the first forward voltage level V_f1Time point (t₁) on light。State diagram now is shown in Figure 15 a。

At commutating voltage V_recVoltage level continue to rise to reach the second forward voltage level V_f2Time (t₂), LED drive control part 500 disconnects the first constant current switch SW₁, hence into the second operating range。Above-mentioned state diagram is shown in Figure 15 b。In the second operating range, a LED group 410 and the 2nd LED group 420 are all lighted, and meanwhile, charging current supply described above is to loopback compensation section 300, thus loopback compensation section 300 is charged。It addition, as it has been described above, the second LED drive current I during the second operating range_LED2It is preferably configured as lower than the first LED drive current I_LED1Value and by current constant control。Above-mentioned relation can be confirmed to (d) of Figure 16 by (b) of Figure 16。Specifically, in (b) of Figure 16, the second operating range (that is, time point t₂To time point t₃Between interval) period the second LED drive current I_LED2It is set below the first operating range (that is, time point t₁To time point t₂Between interval) period the first LED drive current I_LED1Current value and by current constant control。It addition, during the second operating range, charging current Ic is provided to loopback compensation section 300, thus loopback compensation section 300 is charged。Accordingly, as shown in (e) of Figure 16, the light output of the LED illuminating part 400 during the second operating range can be almost identical with the light output of the LED illuminating part 400 during the first operating range。

At commutating voltage V_recThrough peak, voltage level deteriorates to less than the second forward voltage level V_f2Time (t₃), LED drive control part 500 closes the first constant current switch SW as shown in fig. 15 a₁, hence into the first operating range。Now, LED drive control part 500 can pass through to detect the second LED drive current I_LED2And determine commutating voltage V_recVoltage level whether be decreased to less than the second forward voltage level V_f2Value。That is, its composition can meet: at the second LED drive current I detected_LED2When being down to below value set in advance, LED drive control part 500 can interpolate that the voltage level into commutating voltage is less than the second forward voltage level V_f2。

At commutating voltage V_recVoltage level continue to deteriorate to less than the first forward voltage level V_f1Time (t₄), it is possible to as shown in fig. 15 c, the second driving voltage is supplied to a LED group 410 from loopback compensation section 300, thus a LED group 410 will be luminous。As it has been described above, individually do not perform the control of constant current switch at above-mentioned time point, it is possible to naturally perform according to potential difference from loopback compensation section 300 to the electric discharge of a LED group 410。

Commutating voltage V_recVoltage level again rise to the first forward voltage level V_f1(t time above₆), a LED group 410 is again as shown in fig. 15 a according to commutating voltage V_recAnd it is luminous。At commutating voltage V_recEach cycle in all periodically repeatedly perform control process sequentially as above。

It addition, be can confirm that by (e) of Figure 16, LED illuminating part 400 runs through commutating voltage V_recAll intervals and keep nearly constant light to export。Its reason is in that, also makes loopback compensation section 300 be charged, therefore whole input current I during the second operating range while making a LED group 410 and the 2nd LED group 420 luminescence_inAll it is not transmitted to LED illuminating part 400。It is of course also possible to by by the second LED drive current I_LED2It is set at less than the first LED drive current I_LED1Value and carry out the mode of current constant control to reach this effect。

Above, in order to the convenience with example is described, the embodiment become by two LED fabric of a LED group 410 and the 2nd LED group 420 with LED illuminating part 400 is as the criterion and is illustrated, but those skilled in the art are it is clearly understood that its identical mode can be applied in the embodiment that LED illuminating part 400 is become by 3 or 4 or LED fabric above, but also it is appreciated that the above embodiments belong in scope of the presently claimed invention。

The composition of the 7th embodiment of LED light device 1000 and function

Figure 17 is the composition module map schematically of the LED light device of the 7th embodiment according to the present invention。Hereinafter, with reference to Figure 17, composition and function to the LED light device 1000 of the 7th embodiment of the present invention carries out detailed discussion。

LED light device 1000 for the 7th embodiment according to the present invention as shown in figure 17, except also including the 3rd LED group 430 and the 3rd constant current switch SW₃Point beyond, it is similar with the composition of the LED light device 1000 according to the 6th embodiment illustrated in fig. 14。Therefore, the composition of repetition and function can refer to Figure 14 explanation carried out, and based on the difference between the 6th embodiment, the LED light device 1000 of the 7th embodiment according to the present invention inquired into below。

As shown in figure 17, include a LED group 410, the 2nd LED group 420 and the 3rd LED group 430 according to the LED light device 1000 of the 7th embodiment of the present invention and constitute。That is, the LED light device 1000 according to the 7th embodiment of the present invention is the AC LED illuminator under 3 step type of drive。

For the LED light device 1000 according to the 7th embodiment, loopback compensation section 300 is constituted as follows: be charged during the second operating range and the 3rd operating range, and provides the second driving voltage to a LED group 410 compensating in interval。

It is more specifically inquired into, then it can be seen that when LED light device 1000 primary starting, loopback compensation section 300 does not fill electricity with, therefore, a LED group 410 all will not be luminous to the 3rd LED group 430。

At commutating voltage V_recVoltage level in time through and rise and reach the first forward voltage level V_f1Time, the LED drive current I that flows by a LED group 410_LED, thus a LED group is lighted。Now, the first constant current switch SW₁By LED drive current I_LED1Current constant control is the first LED drive current I_LED1Value。

Voltage level at commutating voltage Vrec continues to rise and reaches the second forward voltage level V_f2Time, it is possible to the LED drive current I that flows by a LED group 410 and the 2nd LED group 420_LED, such that it is able to light LED group 410 and a 2nd LED group 420。On above-mentioned time point, LED drive control part 500 disconnects the first constant current switch SW₁And enter the second operating range, and the second constant current switch SW₂By LED drive current I_LEDCurrent constant control is the second LED drive current I_LED2。It addition, simultaneously charging current I_cWill provide for loopback compensation section 300, thus loopback compensation section 300 starts to charge up。

At commutating voltage V_recVoltage level continue rise and reach the 3rd forward voltage level V_f3Time, LED drive current I_LEDFlowed to the 3rd LED group 430 by a LED group 410, thus a LED group 410 starts to light to the 3rd LED group 430。On above-mentioned time point, LED drive control part 500 is by disconnecting the second constant current switch SW₂And enter the 3rd operating range, and the 3rd constant current switch SW₃By LED drive current I_LEDCurrent constant control is the 3rd LED drive current I_LED3Value。Identical with the second operating range, charging current I_cLoopback compensation section 300 it is also supplied with loopback compensation section 300, thus can proceed charging during the 3rd operating range。

At commutating voltage V_recThe 3rd forward voltage level V is deteriorated to less than through peak_f3Time, LED drive control part 500 closes the second constant current switch SW₂, thus being again introduced into the second operating range。The 3rd forward voltage level V is deteriorated to less than through peak at commutating voltage_f3Time point on, by the 3rd constant current switch SW₃And the 3rd LED drive current I flowed_LED3Reduce, and accordingly, the composition of LED drive control part 500 can meet: at the 3rd LED drive current I_LED3Be down to value set in advance following when, it can enter the second operating range。Equally, loopback compensation section 300 can continue to be charged during the second above-mentioned operating range。

At commutating voltage V_recContinue to deteriorate to less than the second forward voltage level V_f2Time, LED drive control part 500 closes the first constant current switch SW₁, thus being again introduced into the first operating range。And between at this moment on point, it is possible to closure ring returns the charging process of compensation section 300。

At commutating voltage V_recContinue to deteriorate to less than the first forward voltage level V_f1Time, the second driving voltage provides a LED group 410 from loopback compensation section 300 naturally according to potential difference, thus a LED group 410 can be luminous in compensation is interval。

Foregoing process will at commutating voltage V_recEach cycle in repeatedly perform。

The composition of the 8th embodiment of LED light device 1000 and function

Figure 18 is the composition module map schematically of the LED light device of the 8th embodiment according to the present invention。With reference to Figure 18, composition and function to the LED light device 1000 of the 8th embodiment according to the present invention carry out detailed discussion。

The LED light device 1000 of the 8th embodiment according to the present invention as shown in figure 18 except possessing the point of the second compensation section 310 in parallel with the 2nd LED group 420, and its composition is similar with the composition of the LED light device 1000 of the 6th embodiment illustrated in Figure 14。Therefore, the composition of repetition and function can refer to Figure 14 explanation carried out, and based on the difference between itself and sixth embodiment, the LED light device 1000 of the 8th embodiment according to the present invention inquired into below。

As shown in figure 18, can by the second capacitor C according to second compensation section 310 of the present invention₂Realizing, but be not limited thereto, it can also utilize various electrical charge/discharge unit and/or electrical charge-discharge circuit to realize。Second compensation section 310 is charged during the second operating range as above, and can perform to supply the function of the second driving voltage to the 2nd LED group 420 in the operating range (that is, the operating range that the 2nd LED group 420 is extinguished) beyond the second operating range。Accordingly, for the 8th embodiment as shown in figure 19, commutating voltage V is run through_recAll intervals, a LED group 410 and the 2nd LED group 420 can remain illuminating state。

The composition of the 9th embodiment of LED light device 1000 and function

Figure 19 is the composition module map schematically of the LED light device of the 9th embodiment according to the present invention。With reference to Figure 19, composition and function to the LED light device 1000 of the 9th embodiment of the present invention carry out detailed discussion。

The LED light device of the 9th embodiment according to the present invention as shown in figure 19 can also include: the first LED drive current configuration part 610, for the first LED drive current is set as required value；Second LED drive current configuration part 620, for being set as required value by the second LED drive current；3rd LED drive current configuration part 630, for being set as required value by the 3rd LED drive current。Except these points, it is similar with the composition of the LED light device of the 6th embodiment illustrated in Figure 14。Therefore, the composition of repetition and function can refer to Figure 14 explanation carried out, and based on the difference between the 6th embodiment, the LED light device 1000 of the 9th embodiment according to the present invention inquired into below。

To the illuminator 1000 according to prior art illustrated with reference to Fig. 2 and Fig. 3, there is one and can not set the first LED drive current I respectively_LED1, the second LED drive current I_LED2, the 3rd LED drive current I_LED3, the 4th LED drive current I_LED4Problem points。That is, for the LED light device 1000 according to prior art, it is constituted as follows: control by the LED drive current I of each operating range with staircase waveform form_LED, therefore in general, it generally can set that LED drive current (such as, a 4th LED drive current I_LED4), and controlled other LED driving interval by the ratio of set LED drive current。Such as, by the 3rd LED drive current I_LED3It is set as the 4th LED drive current I_LED480～90%, by the second LED drive current I_LED2It is set as the 4th LED drive current I_LED465～80%, and by the first LED drive current I_LED1It is set as the 4th LED drive current I_LED430～65% mode。But, this LED light device 100 according to prior art exists one only can not set LED drive current I individually_LEDProblem points, its difficult point in particular, in that, for improving scintillation properties, adopt and as above adjust LED drive current mode, but at random set LED drive current by operating range。Therefore, the LED light device 1000 for the 9th embodiment according to the present invention, it separately possesses the first LED drive current configuration part 610 and the second LED drive current configuration part 620, such that it is able to set each LED drive current according to demand。The embodiment that Figure 19 illustrates the first above-mentioned LED drive current configuration part 610 and the second LED drive current configuration part 620 is utilized respectively variable resistance and realizes, but those skilled in the art all can be clearly understood that driving current settings portion can be realized by other suitable unit (such as, capacitor etc.) or other suitable circuit。

The composition of the 10th embodiment of LED light device 1000 and function

Figure 20 is the composition module map schematically of the LED light device of the 10th embodiment according to the present invention。Referring to Figure 20, composition and function to the LED light device 1000 of the 10th embodiment according to the present invention carry out detailed discussion。

The 10th embodiment illustrated in Figure 20 is similar with the 7th embodiment carrying out hereinbefore with reference to Figure 17 illustrating。Specifically, the 10th embodiment for Figure 20, only replace the 3rd LED group 430 and comprise on the point of dummy load (dummyload) 710 the 7th embodiment from Figure 17 different。

For embodiment as shown in figure 17, dummy load 710 is presented as the first resistance R₁。By comprising dummy load 710 it is achieved that at commutating voltage V_recVoltage level be the second forward voltage level V_f2Make in above interval electric current by dummy load 710 streaming current so that the charge volume that loopback compensation section 300 obtains charging increases and puts on the as many amount of voltage of dummy load 710。Accordingly, having an advantage in that, the charge volume because charging to loopback compensation section 300 increases, it is possible to the forward voltage level (i.e. the first forward voltage level) of a LED group 410 is set as bigger value。In other words, it is assumed that other condition is the same from situation, it is possible to increase at commutating voltage V by comprising dummy load 710_recFour corner in keep the number of the LED being included in a LED group 410 of luminance, scintillation properties can be improved accordingly。

The composition of the 11st embodiment of LED light device 1000 and function

Figure 21 is the composition module map schematically of the LED light device of the 11st embodiment according to the present invention。Referring to Figure 21, LED light device and function to the 11st embodiment according to the present invention carry out detailed discussion。

The 11st embodiment as shown in figure 21 is different from the 7th embodiment as shown in figure 17 on following point: the second compensation section 720 replaces the 3rd LED group 430 to be connected in series in the 2nd LED group 420, and is additionally formed discharge path P between the second compensation section 720 and the 2nd LED group 420₅。The second compensation section 720 as shown in figure 21 is constituted as follows: at commutating voltage V_recThe interval that voltage level is more than the second forward voltage level in be charged, and commutating voltage voltage level less than the second forward voltage level interval in pass through discharge path P₅And discharge and supply the second driving voltage to the 2nd LED group 420。Accordingly, when utilizing 11 embodiment as shown in figure 21, at commutating voltage V_recFour corner in, a LED group 410 and the 2nd LED group 420 can be continuously kept illuminating state。It addition, because the second compensation section 720 is connected in series in the 2nd LED group 420, the effect that the charge volume of the formed loopback compensation section 300 being connected in parallel increases therefore can be brought。

The composition of the 12nd embodiment of LED light device 1000 and function

Figure 22 is the composition module map schematically of the LED light device of the 12nd embodiment according to the present invention。Referring to Figure 22, composition and function to the LED light device 1000 of the 12nd embodiment of the present invention carry out detailed discussion。

The 7th embodiment from Figure 17 on following point of the 12nd embodiment as shown in figure 22 is different: the node between the 2nd LED group 420 and the 3rd LED group 430 is not by the second constant current switch SW₂And it is connected to LED drive control part 500, and it is connected to the negative pole end of rectification part 200。That is, in the 12nd embodiment of Figure 22, the second constant current switch SW₂It is removed。The 12nd above-mentioned embodiment is the embodiment for realizing following effect: by reducing forward voltage level (the i.e. first forward voltage level V of a LED group 410_f1) and make the supply of the second driving voltage by means of loopback compensation section 300 become easy；The 2nd LED group 420 and the 3rd LED group 430 is utilized to make the efficiency of electric current increase；Make a LED group 410 and the 3rd LED group 430 can be driven by means of the second driving voltage supplied from compensation section 300 compensating in interval。For the 12nd above-mentioned embodiment, it is necessary to notice that the forward voltage level of a LED group 410 is less than the forward voltage level of the 2nd LED group 420。

As shown in figure 22, interval (that is, commutating voltage V is being compensated_recVoltage level less than the interval of the first forward voltage level) form discharge path P₆, thus the 3rd LED group 430 and a LED group 410 are lighted。

The composition of the 13rd embodiment of LED light device 1000 and function

Figure 23 is the composition module map schematically of the improved LED light device of scintillation properties (following, to be referred to as " LED light device ") of the 13rd embodiment according to the present invention。Hereinafter, with reference to Figure 23, composition and function to the LED light device 1000 of the 13rd embodiment according to the present invention carries out simple discussion。

The 6th embodiment illustrated above in relation to Figure 14 on following point according to the LED light device of bright the 13rd embodiment of this law as shown in fig. 13 that is different: loopback compensation section supplies the second driving voltage to LED illuminating part 400 300 2 times。But, other composition is similar with the 6th embodiment, and therefore, what identical composition and function were carried out illustrates to utilize the explanation that above carried out, and the distinctive composition of the 13rd embodiment and function carry out the explanation of emphasis。

With reference to Figure 23, may include that rectification part 200, loopback compensation section 300, LED illuminating part 400 and LED drive control part 500 according to the LED light device 1000 of the 13rd embodiment of the present invention。It addition, in above-mentioned element, it is possible to constituted LED drive circuit by loopback compensation section 300 and LED drive control part 500。

First, with the 6th embodiment similarly, can be made up of multiple LED groups according to the LED illuminating part 400 of the 13rd embodiment, and the multiple LED groups being included in LED illuminating part 400 can be sequentially luminous according to the control of LED drive control part 500, it is possible to sequentially extinguish。Figure 23 discloses the LED illuminating part 400 including a LED group 410 and the 2nd LED group 420, but the number that these those skilled in the art are all appreciated that the LED group being included in LED illuminating part 400 can obtain various change according to demand。Only hereinafter, for the convenience illustrated and understand, to comprise the LED illuminating part 400 of a LED group 410 and the 2nd LED group 420, the 13rd embodiment of the present invention is illustrated。

It addition, be in that according to one of feature main of loopback compensation section 300 of the 13rd embodiment: according to the loopback compensation section 300 of the present invention can be constituted in the way of providing the second driving voltage to LED illuminating part secondary。Specifically, constitute as follows according to the loopback compensation section 300 of the present invention: formed with the 2nd LED group 420 and be connected in parallel, at commutating voltage V_recVoltage level be the second forward voltage level V_f2It is charged in above interval, and at commutating voltage V_recVoltage level be the first forward voltage level V_f12nd LED group 420 is supplied the second driving voltage by interval (following, to be referred to as " first compensates the interval ") period above, less than the second forward voltage level Vf2, and at commutating voltage V_recVoltage level be the first forward voltage level V_f1Above, supply the second driving voltage less than the interval of the second forward voltage level (following, to be referred to as " first compensates interval ") period to the 2nd LED group 420, and at commutating voltage V_recVoltage level less than the first forward voltage level V_f1Interval (following, to be referred to as " second compensates interval ") period can in parallel to a LED group 410 and the 2nd LED group 420 supply the second driving voltage。It addition, it is further preferable that compensate between interval and the second compensating basin period first, the composition of a LED group 410 and the 2nd LED group can meet separate。That is, period between the first compensating basin, it is possible to meet: a relative commutating voltage V of LED group 410_recAnd drive independently, the 2nd LED group 420 can drive independently by the second driving voltage；And during between the second compensating basin, a LED group 410 drives independently by means of the second driving voltage provided by the first discharge circuit, the 2nd LED group 420 can drive by means of the second driving voltage provided by the second discharge circuit relatively independently。Hereinafter, more specifically inquire into reference to accompanying drawing。

For performing function as above, as shown in figure 23, charge path P can be passed through according to one end of the loopback compensation section 300 of the present invention₃And be connected to the node between a LED group 410 and the 2nd LED group 420, and by the first discharge path P₄And be connected to the positive terminal of the 2nd LED group 420, and by the second discharge path P₅And it is connected to the positive terminal of a LED group 410。It addition, the other end according to the loopback compensation section 300 of the present invention passes through the second constant current switch SW₂And be connected to LED drive control part 500, and by without the second constant current switch SW₂Independent current path P₆And it is additionally coupled to LED drive control part。Accordingly, the embodiment for Figure 23, a LED group 410 is the LED group of first group, and the 2nd LED group 420 is the LED group of second group。Certainly, composition according to each embodiment, one end of loopback compensation section 300 can be connected to the positive terminal of other LED groups, and between period and the second compensating basin, (multiple) the LED group being different from Figure 23 shown embodiment can be provided the second driving voltage by period between the first compensating basin。Other above-mentioned embodiments are described hereinafter with reference to Figure 26。

It addition, for Figure 23 shown embodiment, constitute as follows according to the loopback compensation section 300 of the present invention: by charge path P₃And it is connected to the node between a LED group 10 and the 2nd LED group 420 such that it is able at the second operating range (that is, commutating voltage V_recVoltage level be the second forward voltage level V_f2Above interval) it is charged。Namely, in the 13rd embodiment according to the present invention, loopback compensation section 300 is charged during loopback compensation section 300 forms the operating range of (multiple) the LED group being connected in parallel, and during between the first compensating basin, loopback compensation section 300 (multiple) LED group to being connected in parallel is (namely, the LED group of second group) supply the second driving voltage, and can between the second compensating basin period by the LED group of the LED group of the second driving voltage supply to second group and first group。Therefore, preferably, it is constituted as follows: the forward voltage level of (multiple) LED group (that is, the LED group of second group) that loopback compensation section 300 formation is connected in parallel only is configured to more than the forward voltage level of (multiple) LED group (the LED group of first group) of reception the second driving voltage between the second compensating basin in period。That is, for the 13rd embodiment as described in Figure 23, the forward voltage level of a LED group 410 is preferably identical with forward voltage level or forward voltage level less than the 2nd LED group 420。But, the invention is not limited in the above embodiments, when the LED light device 1000 according to the present invention includes a LED group 410 to 4 LED groups of 4LED group (not shown), loopback compensation section 300 and 4LED group formation are connected in parallel and at the 4th operating range (that is, commutating voltage V_recVoltage level be the 4th forward voltage level V_f4Above interval) in be charged that (in the case, loopback compensation section 300 is by charge path P₃And it is connected to the node between the 3rd LED group (not shown) and the 4th LED group)。Additionally, should be noted that, similarly when the LED light device 1000 according to the present invention includes n LED group of a LED group 410 to the n-th LED group (not shown), loopback compensation section 300 and the n-th LED group formation are connected in parallel and at the n-th operating range (that is, commutating voltage V_recVoltage level be the n-th forward voltage level V_fnAbove interval) period be charged。

That is, it needs to note, first compensation interval and second interval according to the charging of the loopback compensation section 300 of the present invention compensates interval and can be designed to various form as described above according to demand。

It addition, the forward voltage level compensated by the loopback compensation section 300 according to the present invention can according to the energy charge/discharge unit for constituting loopback compensation section 300 (such as, such as the first capacitor C of Figure 23₁Deng) capacity and be designed to various form。

The LED drive control part 500 according to the present invention as shown in figure 23 is constituted as follows: according to commutating voltage V_recVoltage level and to the constant current switch SW being connected to LED illuminating part 400₁And SW₂It is controlled and controls the driving of a LED group 410 and the 2nd LED group 420。

As it has been described above, the LED drive control part 500 according to the present invention can generally utilize two ways to determine commutating voltage V_recVoltage level。In one embodiment, the composition according to the LED drive control part 500 of the present invention can meet: can directly detect commutating voltage V_recVoltage level, and based on this, driving of a LED group 410 and the 2nd LED group 420 is controlled。In another embodiment, the composition according to the LED drive control part 500 of the present invention can meet: can detect the LED drive current I by the LED illuminating part 400 that flows_LEDOr it is connected to (multiple) constant current switch SW of LED illuminating part 400₁And SW₂And the LED group 410 flowed, and based on detected LED drive current I_LEDThe driving of the oneth LED group 410 and the 2nd LED group 420 is controlled。Below, the embodiment constituted in the way of directly detecting driving voltage is as the criterion for the convenience that illustrates and understand and the LED light device 1000 according to the present invention is illustrated, it is noted, however, that the present invention may be also equally applied to utilize driving current detecting mode to control the LED light device that the mode of the driving between multiple LED group is constituted。

It addition, the first constant current switch SW according to the present invention₁And the second constant current switch SW₂Constitute as follows: close according to the control of LED drive control part 500 and connect current path or disconnection and separate current path, and perform to detect the LED drive current I flowed by the current path that is connected to_LEDAnd come LED drive current I with value set in advance_LEDCarry out the function of rectification control。

The LED drive control part 500 of the present invention as shown in figure 23 is constituted as follows: detection commutating voltage V_recVoltage level, and according to detected commutating voltage V_recVoltage level and to the first constant current switch SW₁And the second constant current switch SW₂It is controlled, thus controlling the driving of a LED group 410 and the 2nd LED group 420。The detailed function of above-mentioned LED drive control part 500 carries out concrete discussion hereinafter with reference to Figure 24 to Figure 25。

Figure 24 a to Figure 24 d be the LED light device of the 13rd embodiment according to the present invention as shown in figure 23 by the switching control state of operating range, by the composition module map driving electric current and loopback compensation section charging and discharging currents of LED group。It addition, Figure 25 illustrates the oscillogram according to the commutating voltage temporally of LED light device of the 13rd embodiment of the present invention as shown in figure 23, a LED group driving electric current, second group of LED drive current and loopback compensation section charging and discharging currents。

Hereinafter, with reference to Figure 24 a to Figure 24 d and Figure 25, the operating process of the LED light device 1000 of the 13rd embodiment according to the present invention as shown in figure 23 is carried out detailed discussion。

First, as shown in figure 25, the illuminator 1000 of LED is when initial start, and loopback compensation section 300 is do not fill the state of electricity with。Accordingly, at commutating voltage V_recVoltage level reach the first forward voltage level V_f1Before, the LED drive current that flows not by a LED group 410 or the 2nd LED group 420。In this case, the first constant current switch SW₁For closure state, and the second constant current switch SW₂For off-state。Process over time, is supplied in the commutating voltage V of LED illuminating part 400_recVoltage level from the forward voltage level rising to a LED group 410, i.e. the first forward voltage level V_f1Above time point (the time point t of Figure 25₁) start to a LED group 410 flowing first electric current I₁, thus the first operating range is lighted and entered to a LED group 410。(the time point t of Figure 25 during Figure 24 a illustrates the first above-mentioned operating range₁To time point t₂) in the first constant current switch SW₁And the second constant current switch SW₂Controlled state and LED group drive electric current I_{LED_G}, as shown in fig. 24 a, during the first operating range, the first electric current I₁Flowed by a LED group 410, accordingly, the first electric current I₁It is the first LED drive current I_LED1, it is that a LED group drives electric current I simultaneously_{LED_G1}。It addition, during the first operating range, the first LED drive current I flowed by a LED group 410_LED1For the first LED drive current value set in advance, it can by the first constant current switch SW₁Come by current constant control。

Process over time, commutating voltage V_recVoltage level rise and become the second forward voltage level V_f2Above, between at this moment on point (the time point t2 of Figure 25), LED drive control part 500 disconnects the first rectifier switch SW1 and separates the first current path P1, and closes the second rectifier switch SW2 and connect the second current path P2, hence into the second operating range。The first rectifier switch SW1 interior during such second operating range and the controlled state of the second rectifier switch SW2, LED group driving electric current I_{LED_G}It is illustrated in Figure 24 b。As shown in Figure 24 b and Figure 25, in such second operating range (the time point t2～time point t3 of Figure 25, time point t7～time point t8 is interval) period, " the second electric current I2+ the 3rd electric current I3 " (that is, a LED group drives electric current I_{LED_G1}) will be flowed by a LED group 410, so that a LED group 410 is luminous, and the second electric current I2 (that is, the 2nd LED group driving electric current I_{LED_G2}) will be flowed by the 2nd LED group 420, so that the 2nd LED group 420 is luminous。Further, during such second operating range, charging current (the 3rd electric current I3) will flow in loopback compensation section 300 by charge path P3, so that loopback compensation section 300 is charged。Therefore, in such embodiments, the second operating range is equivalent to charging interval。It addition, as shown in Figure 24 b and Figure 25, during the second above-mentioned operating range, the LED group flowed by a LED group 410 drives electric current I_{LED_G1}For " the 2nd electric current I₂+ the three electric current I₃"；The 2nd LED group flowed by the 2nd LED group drives electric current I_{LED_G2}It is the second electric current I₂；By the second constant current switch SW₂The the second LED drive current I controlled_LED2For " the second electric current I₂+ the three electric current I₃"。Accordingly, during the second above-mentioned operating range, the second LED drive current I_LED2(that is, the second electric current I₂+ the three electric current I₃) with the second LED drive current value of setting in advance and by the second constant current SW₂Carry out current constant control。Additionally, be can confirm that by Figure 25, except the initial set-up time of LED light device 1000, because (namely a LED group 410 and the 2nd LED group 420 continue the state that is remain on, because the number of luminous LED is identical), it is possible to freely set for LED drive current being carried out the first LED drive current value set in advance of current constant control and the second LED drive current value set in advance。As shown in figure 25, the first LED drive current value set in advance and the second LED drive current value set in advance for the current constant control of LED drive current are set to almost identical current value。On the contrary, to a part of LED group at commutating voltage V_recA cycle a part during in other embodiments of extinguishing, its compositions can also meet: is inversely proportional to for the LED drive current value of current constant control of LED drive current and the number form of LED lighted or is substantially inversely proportional to。Other above-mentioned embodiments are described below with reference to Figure 26。

It addition, process over time, at commutating voltage V_recIt is gradually decrease to less than the second forward voltage level V after arriving maximal voltage level_f2Time point (the time point t of Figure 25₃) on, LED drive control part 500 disconnects the second constant current switch SW₂And make the second current path P₂Separate, and close the first constant current switch SW₁And connect the first current path P₁, compensate interval hence into first。Figure 24 illustrates: above-mentioned first compensates interval (commutating voltage V_recVoltage level be the first forward voltage level V_f1Above, less than the second forward voltage level V_f2Interval；The time point t of Figure 25₃～time point t₄, time point t₆～time point t₇, time point t₈～time point t₉) period the first constant current switch SW₁And the second constant current switch SW₂Controlled state and LED group drive electric current I_{LED_G}。As shown in Figure 24 c and Figure 25, period, commutating voltage V between the first compensating basin_recVoltage level be the first forward voltage level V_f1Above, therefore a LED group 410 is driven by commutating voltage 300, and the 2nd LED group 420 is by by the first discharge path P₄And drive from the second driving voltage of loopback compensation section 300 supply。

As shown in figure 24, period, the first operating range as above, the first electric current I that flows by a LED group 410 between the first above-mentioned compensating basin₁。Accordingly, between the first compensating basin, the oneth LED group of period drives electric current I_{LED_G1}It is the first electric current I₁, and the first electric current I₁By means of the first constant current switch SW₁And be the first LED drive current value set in advance by current constant control。On the contrary, as shown in Figure 24 c, period, the second constant current switch SW between the first above-mentioned compensating basin₂For off-state, therefore constitute the first discharge circuit connected with the order of loopback compensation section 300 → the first discharge path P4 → the 2nd LED group 420 → loopback compensation section 300, and accordingly, by the first discharge circuit, the 4th electric current I₄The 2nd LED group 420 flowed by the 2nd LED group 420, thus can be remain on state。Now, in order to reduce or eliminate by the light output bias of operating range, period, the 4th electric current I flowed by the 2nd LED group 420 between the first compensating basin₄Be configured to the second operating range during the second electric current I of being flowed by the 2nd LED group₂Identical。

It addition, process over time, at commutating voltage V_recIt is gradually decrease to less than the first forward voltage level V_f1Time point (the time point t of Figure 25₄) on, it is interval that LED drive control part 500 can enter the second compensation。Figure 24 d illustrates: above-mentioned compensates interval (commutating voltage V less than second_recVoltage level less than the first forward voltage level V_f1Interval；The time point t of Figure 25₄～time point t₆, time point t₈～time point t₁₀) period the first constant current switch SW₁And the second constant current switch SW₂Controlled state and LED group drive electric current I_{LED_G}。As shown in Figure 24 d, the first constant current switch SW of period between the second compensating basin₁And the second constant current switch SW₂Controlled state and the first compensating basin between period the first constant current switch SW₁And the second constant current switch SW₂Controlled state identical, it is possible to by the voltage level of loopback compensation section 300 and commutating voltage V_recVoltage level between potential difference be formed naturally the first discharge circuit and the second discharge circuit。That is, as shown in Figure 24 d, period between the second above-mentioned compensating basin, a LED group 410 and the 2nd LED group 420 can be connected in parallel with loopback compensation section 300 formation respectively and obtain the supply of the second driving voltage。Specifically, period between the second compensating basin, the 2nd LED group 420 is connected to loopback compensation section by the first discharge circuit as above, thus being driven by the 4th electric current I4。On the contrary, a LED group 410 is by by loopback compensation section 300 → the second discharge path P₅→ the one LED group 410 → the first constant current switch SW₁The second discharge current that → LED drive control part 500 → loopback compensation section 300 connects and be connected to loopback compensation section 300。Period between the second above-mentioned compensating basin, by the second discharge circuit, the 5th electric current I₅A LED group 410 can be flowed by a LED group 410, thus can be remain on state。Therefore, period between the second compensating basin, the LED group flowed by a LED group 410 drives electric current I_{LEDG_1}It is the 5th electric current I₅, and in order to reduce or eliminate by the light output bias of operating range, the 5th electric current I5 that period is flowed by a LED group 410 between the second compensating basin can by the first constant current switch SW₁Carry out the first electric current I that current constant control is and between the first compensating basin, period is flowed by a LED group₁Identical value。Above-mentioned result illustrates in fig. 25。

Above, to the initial start of LED light device 1000 commutating voltage V time_recA cycle during the first constant current switch SW₁And the second constant current switch SW₂Controlled state and LED group drive electric current I_{LED_G}It is illustrated。After the initial startup, LED light device 1000 is at commutating voltage V_recA cycle during in, according to commutating voltage V_recIncrease and decrease and sequentially perform the control to " the second of Figure 24 d compensates the first of interval → Figure 24 c and compensate first the compensating the second of interval → Figure 24 d and compensate interval of the second operating range (charging interval) → Figure 24 c of interval → Figure 24 b ", and at commutating voltage V_recEach cycle in all periodically repeatedly perform above-mentioned control process。It addition, be made up of above-mentioned, for the LED light device 1000 according to the 13rd embodiment, a LED group 410 and the 2nd LED group 420 can run through the commutating voltage V after the initial start of LED light device 1000_recComplete period and be remain on state。

The composition of the 14th embodiment of LED light device 1000 and function

Figure 26 is the composition module map schematically of the LED light device of the 14th embodiment according to the present invention。The LED light device 1000 of the 14th embodiment according to the present invention as shown in figure 26 is similar with the composition of the LED light device 1000 according to the 13rd embodiment as shown in figure 23 except following point: also include the 3rd LED group the 430, the 3rd constant current switch SW₃And the 3rd current path P₇, and one end of loopback compensation section 300 is by the 3rd constant current switch SW₃And it is connected to LED drive control part 500。Therefore, the composition of repetition and function can refer to Figure 23 explanation carried out, and inquire into based on its discrepancy with the 13rd embodiment according to the LED light device 1000 of the 14th embodiment below。

For the 14th embodiment gone out illustrated in Figure 26, loopback compensation section 300 and the difference of the 3rd embodiment according to the present invention are in that: be charged during the 2nd operating range and the 3rd operating range, and during above-mentioned operating range, LED drive control part 500 is according to commutating voltage V_recVoltage level and control being sequentially driven of the 2nd LED group 420 and the 3rd LED group 430。It addition, the composition according to the loopback compensation section 300 of the present invention can meet: can at commutating voltage V_recVoltage level be the first forward voltage level V_f1Above, less than the second forward voltage level V_f2Interval (first compensate for interval) period to the 2nd LED group 420 and the 3rd LED group 430 supply the second driving voltage, and at commutating voltage V_recVoltage level less than the first forward voltage level V_f1Interval (second compensate for interval) period supply the second driving voltage respectively to the LED group (the LED group 410 in Figure 26) of first group and the LED group (mutually forming the 2nd LED group 420 and the 3rd LED group 430 being connected in series in Figure 26) of second group。

It is carried out concrete discussion, when the initial start of LED light device 1000, the first constant current switch SW₁For closure state, and the second constant current switch SW₂And the 3rd constant current switch SW₃For off-state。When above-mentioned, rise from voltage level and reach the first forward voltage level V_f1Time point start the first LED drive current I that flows_LED1, thus a LED group 410 is luminous。

At commutating voltage V_recVoltage level continue over time through and reach the second forward voltage level V_f2Time point on, LED drive control part 500 disconnects the first constant current switch SW₁, and close the second constant current switch SW₂And the 3rd constant current switch SW₃, hence into the second operating range。During the second above-mentioned operating range, a LED group 410 and the 2nd LED group 420 are lighted, and charging current is by charge path P₃And supply to loopback compensation section 300。It addition, with the 13rd embodiment similarly, during the second above-mentioned operating range of the 14th embodiment, " charging current the+the second LED drive current I_LED2" flowed by a LED group 410, the second LED drive current I_LED2Being flowed by the 2nd LED group 420, charging current is flowed by loopback compensation section 300。Only, different from the 13rd embodiment, during the second operating range of the 14th embodiment, the second constant current switch SW₂Constitute as follows: come only to the second LED drive current I by value set in advance_LED2Carry out current constant control。

At commutating voltage V_recVoltage level continue over time through and rise and reach the 3rd forward voltage level V_f3Time point on, LED drive control part 500 disconnects the second constant current switch SW₂, hence into the 3rd operating range。During the 3rd above-mentioned operating range, a LED group 410 is lighted to the 3rd LED group 430, and meanwhile, charging current passes through charge path P₃And supply to loopback compensation section 300。During the 3rd above-mentioned operating range of the 14th embodiment, " the 3rd LED drive current I_LED3" flowed by a LED group 410, and the 3rd LED drive current I_LED3Flowed by the 2nd LED group 420 and the 3rd LED group 430, and charging current is flowed by loopback compensation section 300。3rd constant current switch SW₃By " charging current the+the three LED drive current I_LED3" current constant control is value set in advance。

It addition, process over time, at commutating voltage V_recLevel peak after begin to decline and again reach the second forward voltage level V_f2Time point on, LED drive control part 500 closes the second constant current switch SW₂, thus reentering the second operating range。

Voltage level at commutating voltage Vrec continues process over time and declines and again reach the first forward voltage level V_f1Time point on, LED drive control part 500 disconnects the second constant current switch SW₂And the 3rd constant current switch SW₃, and close the first constant current switch SW₁, compensate interval hence into first。Period, commutating voltage V between the first above-mentioned compensating basin_recVoltage level be the first forward voltage level V_f1Above, therefore a LED group 410 by commutating voltage V_recControlling, the 2nd LED group 420 and the 3rd LED group 430 are passed through the first discharge path P by from loopback compensation section 300₄And the second driving voltage supplied drives。That is, period, the second constant current switch SW between the first above-mentioned compensating basin₂And the 3rd constant current switch SW₃For off-state, therefore constitute with loopback compensation section 300 → the first discharge path P₄The first discharge circuit that → the two LED group the 420 → the 3rd LED group 430 → loopback compensation section 300 connects。And accordingly, by the first discharge circuit, the first discharge current (such as, the 4th electric current I of Figure 24 c₄) flowed by the 2nd LED group 420 and the 3rd LED group 430, therefore, the 2nd LED group 420 and the 3rd LED group 430 are remain on state。

Additionally, at commutating voltage V_recOver time through and be gradually reduced to less than the first forward voltage level V_f1Time point on, it is interval that LED drive control part 500 can enter the second compensation。The first constant current switch SW of period between the second above-mentioned compensating basin₁To the 3rd constant current switch SW₃Controlled state and the first compensating basin between period the first constant current switch SW₁To the 3rd constant current switch SW₃Controlled state identical, and can according to the voltage level of loopback compensation section 300 and commutating voltage V_recVoltage level between potential difference and be formed naturally the first discharge circuit and the second discharge circuit。Namely, period between the second above-mentioned compensating basin, the LED group (a LED group 410) of first group and the LED group (mutually forming the 2nd LED group 420 and the 3rd LED group 430 that are connected in parallel) of second group are formed with loopback compensation section 300 respectively and are connected in parallel and receive the second driving voltage。Specifically, period between the second compensating basin, the 2nd LED group 420 and the 3rd LED group 430 are connected to loopback compensation section by the first discharge circuit as above, thus being driven by the first discharge current。On the contrary, a LED group 410 is by being connected as loopback compensation section 300 → the second discharge path P₅→ the one LED group 410 → the first constant current switch SW₁Second discharge current of → LED drive control part 500 → loopback compensation section 300 and be connected to loopback compensation section 300。Period between the second above-mentioned compensating basin, by the second discharge circuit, the second discharge current (such as, the 5th electric current I of Figure 24 d₅) flowed by a LED group 410, thus a LED group 410 can be remain on state。

After the initial startup, LED light device 1000 is at commutating voltage V_recA cycle within according to commutating voltage V_recIncrease and decrease and sequentially perform to " second compensate interval → first compensate interval → the second operating range (charging interval) → the 3rd operating range (charging interval) → the second operating range → the first compensate interval → second compensate interval " control, and at commutating voltage V_recEach cycle in all periodically repeatedly perform above-mentioned control。It addition, because of above-mentioned composition, run through the commutating voltage V that the initial start of LED light device 1000 is later_recComplete period, state can be remain on according to a LED group 410 of the LED light device 1000 of the 13rd embodiment and the 2nd LED group 420, and, the 3rd LED group 430 can according to commutating voltage V_recVoltage level and optionally lighted/extinguished。

It addition, as above inquired into, for the LED light device 1000 according to the 14th embodiment, its 3rd LED group 430 is because optionally being lighted according to operating range/extinguished, and therefore, the quantity carrying out luminous LED by operating range forms difference。Therefore, in order to make to eliminate by the light output bias of operating range or minimize, it is possible to the size carrying out the LED drive current by the flowing of LED group by operating range is controlled as mutually different size。The size of the LED drive current of (first compensate interval, second compensate interval, the 3rd operating range) period controls the value for the size less than the LED drive current during the operating range (the second operating range) that only a LED group 410 and the 2nd LED group 420 are lighted for example, it is possible to the operating range that a LED group 410 is all lighted to the 3rd LED group 430。At this point it is possible to be sized to inversely or to become be similar to the size of inverse relation with the number of luminous LED by LED drive current。

It addition, because the 3rd LED group 430 is optionally lighted/extinguished, the composition of the number constituting multiple LED of the 3rd LED group 430 number less than the LED of the 2nd LED group 420 can will be used for it may be preferable to adopt。It addition, because the 3rd LED group 430 is optionally lighted/extinguished, it may be preferable to take the forward voltage level of the 3rd LED group 430 composition less than the forward voltage level of a LED group 410 and/or the forward voltage level of the 2nd LED group 420。

Above, to being illustrated according to comprising a LED group 410 to the operating process of the LED light device 1000 of the 14th embodiment of the present invention of the 3rd LED group 430。But, its LED light device that may be applied to equally include other embodiments of a LED group 410 to the n-th LED group (not shown) according to identical principle。Such as, for other above-mentioned embodiments, hereinafter suppose that one end of loopback compensation section 300 is connected to LED drive control part 500 by the n-th constant current switch (not shown), and the other end of loopback compensation section 300 is connected to the node between a LED group 410 and the 2nd LED group 420 by charge path, and it is connected to the positive terminal of the 2nd LED group 420 by the first discharge path P4, by the second discharge path P₅And it is connected to the situation of the positive terminal of a LED group 410。For the above embodiments, the charging interval of loopback compensation section 300 be the second operating range to the n-th operating range, and between charging zone period, the 2nd LED group 420 to the n-th LED group is driven in order。It addition, compensating in interval, the LED group forming first group be connected in parallel with loopback compensation section 300 respectively is a LED group, the LED group of second group is mutually form the 2nd LED group that is connected in series to the n-th LED group。Therefore, interval (commutating voltage V is compensated first_recVoltage level be the first forward voltage level V_f1Above, less than the second forward voltage level V_f2Interval) period, loopback compensation section 300 to the 2nd LED group to n-th LED group supply the second driving voltage, it is possible to second compensate interval (commutating voltage V_recVoltage level less than the first forward voltage level V_f1) period, the LED group of first group and the LED group of second group are supplied the second driving voltage by loopback compensation section 300 respectively。

In addition, it is assumed that a kind of embodiment: include a LED group 410 to the 4th LED group (not shown)；One end of loopback compensation section 300 is connected to LED drive control part 500 by the 4th constant current switch (not shown)；The other end of loopback compensation section 300 passes through charge path P₃And it is connected to the node between the 2nd LED group 420 and the 3rd LED group 430；The positive terminal of the 3rd LED group 430 it is connected to by the first discharge path；The positive terminal of a LED group 410 it is connected to by the second discharge path。For another above-mentioned embodiment, the LED group of first group is LED group 410 and the 2nd LED group 420 mutually connected by series system, and the LED group of second group is the 3rd LED group 430 and the 4th LED group mutually connected by series system。It addition, for the above embodiments, charging interval is the 3rd operating range and the 4th operating range, the first compensation interval is commutating voltage V_recVoltage level be the first forward voltage level V_f1Above, less than the 3rd forward voltage level V_f3Interval, and second compensate interval be commutating voltage V_recVoltage level less than the first forward voltage level V_f1Interval。

Therefore, period between charging zone, the 3rd LED group 430 and the 4th LED group are according to commutating voltage V_recVoltage level and driven in order, and between the first compensating basin period, a LED group 410 and the 2nd LED group 420 are according to commutating voltage V_recVoltage level and driven in order。Additionally, period between the first compensating basin, loopback compensation section 300 is to the 3rd LED group 430 and the 4th LED group (namely, the LED group of second group) supply the second driving voltage, and during between the second compensating basin, the LED group (mutually forming LED group 410 and the 2nd LED group 420 being connected in parallel) of first group and the LED group (mutually forming the 3rd LED group 430 and the 4th LED group being connected in series) of second group can be supplied the second driving voltage by loopback compensation section 300 respectively。

As above inquired into, it is necessary to note: the LED group of various composition can be applied according to the loopback compensation section 300 of the present invention, and be not limited to the specific embodiment illustrated in the present invention。

The composition of the 15th embodiment of LED light device 1000 and function

Figure 27 is the composition module map schematically of the LED light device of the 15th embodiment according to the present invention。Hereinafter, with reference to Figure 27, composition and function to the LED light device 1000 of the 15th embodiment according to the present invention carries out detailed discussion。

The LED light device 1000 of the 15th embodiment according to the present invention as shown in figure 27 can also include: the first LED drive current configuration part 610, for by the first LED drive current I_LED1It is set as required value；And the second LED drive current configuration part 620, for by the second LED drive current I_LED2It is set as required value。Except above-mentioned point, it is similar with the composition of the LED light device 1000 according to the 13rd embodiment as shown in figure 23。Therefore, the composition of the repetition of the LED light device 1000 according to the 15th embodiment and function be can refer to Figure 23 to Figure 25 explanation carried out。

To the LED light device 1000 according to prior art illustrated with reference to Fig. 2 and Fig. 3, it has a problem in that, it is impossible to set the first LED drive current I respectively_LED1, the second LED drive current I_LED2, the 3rd LED drive current I_LED3, and the 4th LED drive current I_LED4。Namely, for the LED light device according to prior art, it is constituted as follows: control by the LED drive current of each operating range by staircase waveform form, therefore in general, it is constituted as follows: can set LED drive current (such as, a 4th LED drive current I_LED4), and make other LED drive current be controlled in the ratio of set LED drive current。Such as, by the 3rd LED drive current I_LED3It is set as the 4th LED drive current I_LED480～90%, by the second LED drive current I_LED2It is set as the 4th LED drive current I_LED465～80%, and by the first LED drive current I_LED1It is set as the 4th LED drive current I_LED430～65% mode。But, this LED light device 100 according to prior art exists one only can not set LED drive current I individually_LEDProblem points, its difficult point in particular, in that, in order to improve scintillation properties, adopt the as above mode adjusting LED drive current, but at random set LED drive current by operating range。Therefore, the LED light device 1000 for the 16th embodiment according to the present invention, it separately possesses the first LED drive current configuration part 610 and the second LED drive current configuration part 620, such that it is able to set each LED drive current according to demand。The embodiment that Figure 27 illustrates above-mentioned the 610, second LED drive current configuration part 620, the first LED drive current configuration part and the 3rd LED drive current configuration part 630 is utilized respectively variable resistance and realizes, but those skilled in the art all can be clearly understood that driving current settings portion can be realized by other suitable unit (such as, capacitor etc.) or other suitable circuit。

The composition of the 16th embodiment of LED light device 1000 and function

Figure 28 is the composition module map schematically of the LED light device of the LED light device of the 16th embodiment according to the present invention。Referring to Figure 28, composition and function to the LED light device of the 16th embodiment according to the present invention carry out detailed discussion。

The LED light device 1000 of the 16th embodiment according to the present invention as described in Figure 28 is except, except replacing the 3rd LED group 430 to comprise the point of dummy load (dummyload) 630, other parts are similar with the LED light device 1000 of the 14th embodiment illustrated with reference to Figure 26。

For embodiment as shown in figure 17, dummy load 630 is realized by the first resistance R1。By comprising dummy load 630 it is achieved that at commutating voltage V_recVoltage level be the second forward voltage level V_f2Electric current is made to be flowed by dummy load 630 in above interval, so that loopback compensation section 300 obtains the amount that charge volume increases and the voltage putting on dummy load 630 is equally big of charging。Accordingly, having an advantage in that, the charge volume because charging to return rings compensation section 300 increases, it is possible to the forward voltage level (i.e. the first forward voltage level) of a LED group 410 is set as bigger value。In other words, it is assumed that other condition is the same from situation, it is possible to increase at commutating voltage V by comprising dummy load 630_recFour corner in keep the number of the LED being included in a LED group 410 of luminance, scintillation properties can be improved accordingly。

Claims

1. a LED light device, including:

Rectification part, the alternating voltage applied being connected to alternating current power supply carries out all wave rectification, and provides LED illuminating part using the commutating voltage of all wave rectification as the first driving voltage；

LED illuminating part, comprise a LED group to constitute to the n-th LED group, and it is from described rectification part, described commutating voltage is luminous as described first driving voltage reception in non-compensation is interval, and compensate interval in receive the second driving voltage and luminous from loopback compensation section, wherein, n is the positive integer of more than 2；

Loopback compensation section, one end is connected to the described LED group negative pole end to a LED group in the (n-1)th LED group by charge path, described one end is additionally coupled to the described LED group positive terminal to a LED group in the (n-1)th LED group by discharge path, the other end is connected to LED drive control part, and utilize described commutating voltage to fill energy in charging interval, and provide described second driving voltage described compensation in interval to described LED illuminating part；And

LED drive control part, for detecting by being connected respectively to the LED drive current that a described LED group flows to the constant current switch of described n-th LED group, and controls a described LED group being sequentially driven to the n-th LED group according to the LED drive current detected。

2. LED light device as claimed in claim 1, wherein,

Described loopback compensation section is connected to the positive terminal of a described LED group and provides the second driving voltage to a described LED group in described compensation interval。

3. LED light device as claimed in claim 1, wherein,

Described LED drive control part sets by the LED drive current value of each operating range based on the sum of the LED luminous by operating range, and by the LED drive current value of operating range, the LED drive current in associative operation interval is carried out current constant control according to what set, and described first LED drive current sets in the way of sequentially reducing to the n-th LED drive current, wherein, it is the first LED drive current to the n-th LED drive current by the LED drive current of each operating range。

4. LED light device as claimed in claim 1, wherein,

Described LED drive control part will be set as being inversely proportional to the sum of the LED luminous by operating range by the LED drive current value of each operating range, and by the LED drive current value of operating range, the LED drive current in associative operation interval is carried out current constant control according to what set, wherein, it is the first LED drive current to the n-th LED drive current by the LED drive current of each operating range。

5. LED light device as claimed in claim 1, wherein,

Described LED illuminating part includes a LED group and the 2nd LED group,

The difference between a described LED group and the light output of described 2nd LED group during the light output of the described LED group during the first operating range and the second operating range is below smooth output bias set in advance。

6. LED light device as claimed in claim 1, wherein,

Described LED illuminating part includes a LED group and the 2nd LED group,

Described second driving voltage is more than the forward voltage level of a described LED group。

7. LED light device as claimed in claim 1, wherein,

Described LED illuminating part includes a LED group and the 2nd LED group,

The peak value of described commutating voltage is more than 2 times of the forward voltage level of a described LED group。

8. LED light device as claimed in claim 1, wherein, described LED drive control part also includes:

First LED drive current configuration part to the n-th LED drive current configuration part, is able to set the LED drive current value that the first LED drive current value is corresponding to the n-th LED drive current value。

9. LED light device as claimed in claim 8, wherein,

Described first LED drive current configuration part to described n-th LED drive current configuration part is made up of variable resistance respectively。

10. LED light device as claimed in claim 1, wherein, described LED drive control part includes:

First constant current switch is to the n-th constant current switch, it is connected respectively to a described LED group extremely described n-th respective negative pole end of LED group, and connect according to described operating range or separate the first current path to the n-th current path, and in each operating range, described LED drive current is carried out current constant control。

11. LED light device as claimed in claim 10, wherein, described LED drive control part also includes:

(n+1)th constant current switch, between described loopback compensation section with described LED drive control part, connect or separate the (n+1)th current path between described loopback compensation section and described LED drive control part, and in described charging is interval, (n+1)th LED drive current is carried out current constant control。

12. LED light device as claimed in claim 11, wherein,

Described LED drive control part detects the charging current flowed by being connected to described (n+1)th constant current switch of described loopback compensation section, thus judging the entrance in charging interval and whether departing from, and entering, the time point that charging is interval disconnects the n-th constant current switch, and departing from, the time point that charging is interval closes described n-th constant current switch。

13. LED light device as claimed in claim 12, wherein,

Described LED drive control part closes described (n+1)th constant current switch being connected to described loopback compensation section according to the rising of described commutating voltage on the time point entering the n-th operating range from the (n-1)th operating range, and detect the charging current flowed through, when the charging current detected rise to value set in advance above time, extinguish the n-th LED group by disconnecting described n-th constant current switch and enter between charging zone, when entering into the charging current detected after described charging interval and being down to below value set in advance, close the n-th constant current switch, thus again lighting described n-th LED group and being again introduced into the n-th operating range。

14. LED light device as claimed in claim 13, wherein,

(n+1)th LED drive current value is set to identical with the (n-1)th driving current value。

15. LED light device as claimed in claim 11, wherein,

Described LED illuminating part includes a LED group and the 2nd LED group,

The forward voltage level of a described LED group is more than the forward voltage level of described 2nd LED group。

16. LED light device as claimed in claim 11, wherein, described LED light device also includes:

N-th+2 switch, between node and the described loopback compensation section between described (n-1)th LED group and described n-th LED group, and closes according to the control of described LED drive control part or disconnects,

Wherein, described LED drive control part closes described n-th+2 switch on the n-th operating range entry time point, and disconnects described n-th+2 switch on interval time point entering described compensation。

17. LED light device as claimed in claim 11, wherein, described LED light device also includes:

Second compensation section, is connected in parallel in described n-th LED group, and is charged during the n-th operating range, and to described n-th LED group supply driving voltage during the described n-th non-luminous illegal light interval of LED group。

18. LED light device as claimed in claim 10, wherein,

Described loopback compensation section is connected in parallel in the negative pole end of described n-th LED group, the other end of described loopback compensation section and described n-th LED group and is connected to described drive control part commonly by described n-th constant current switch。

19. LED light device as claimed in claim 18, wherein,

Described LED illuminating part comprises a LED group and the 2nd LED group,

The forward voltage level of a described LED group is less than or equal to the forward voltage level of described 2nd LED group。

20. LED light device as claimed in claim 18, wherein,

Described LED illuminating part comprises a LED group, the 2nd LED group and the 3rd LED group,

Described loopback compensation section is connected in parallel in the 2nd LED group and the 3rd LED group, one end of described loopback compensation section is connected to the positive terminal of a described LED group, thus being charged during the second operating range and the 3rd operating range, and described compensation in interval, described second driving voltage is provided to a LED group。

21. LED light device as claimed in claim 20, wherein,

Described LED illuminating part replaces described 3rd LED group to comprise dummy load。

22. LED light device as claimed in claim 18, wherein, described LED light device also includes:

Second compensation section, is connected in parallel with described n-th LED group, and is charged during described n-th operating range, and to described n-th LED group supply driving voltage during the described n-th non-luminous illegal light interval of LED group。

23. LED light device as claimed in claim 18, wherein, described LED light device also includes:

Second compensation section, it is connected in series in described n-th LED group, and be charged in the interval that voltage level is more than the n-th forward voltage level of described commutating voltage, and during the described n-th non-luminous illegal light interval of LED group, it be connected to the discharge path of described n-th LED group in parallel and supply driving voltage to described n-th LED group。

24. LED light device as claimed in claim 18, wherein,

Described LED illuminating part includes a LED group, the 2nd LED group and the 3rd LED group,

Node between described 2nd LED group and described 3rd LED group is connected to the negative pole end of described rectification part,

Described loopback compensation section is connected in parallel with the 2nd LED group and the 3rd LED group formation, one end of described loopback compensation section is connected to the negative pole end of a described LED group, and be charged during the second operating range and the 3rd operating range, and supply described second driving voltage to a described LED group and described 3rd LED group during described discharge range。

25. a LED drive circuit, for controlling the driving of LED illuminating part, described LED illuminating part includes a LED group to the n-th LED group, and from rectification part, the commutating voltage of all wave rectification is received as the first driving voltage, n is the positive integer of more than 2, and wherein, described LED drive circuit includes:

Loopback compensation section, one end is connected to the described LED group negative pole end to any one the LED group in the (n-1)th LED group by charge path, described one end is additionally connected to the described LED group positive terminal to any one the LED group in the (n-1)th LED group by discharge path, the other end is connected to LED drive control part, and utilize described commutating voltage to fill energy in charging interval, and provide the second driving voltage compensating in interval to described LED illuminating part；And

LED drive control part, detects by being connected respectively to the LED drive current that a described LED group flows to the constant current switch of described n-th LED group, and controls a described LED group being sequentially driven to the n-th LED group according to the LED drive current detected。

26. LED drive circuit as claimed in claim 25, wherein,

Described loopback compensation section is connected to the positive terminal of a described LED group, thus providing the second driving voltage to a described LED group in described compensation interval。

27. LED drive circuit as claimed in claim 25, wherein,

Described LED drive control part sets by the LED drive current value of each operating range based on the sum of the LED luminous by operating range, and by the LED drive current value of each operating range, the LED drive current in associative operation interval is carried out current constant control according to what set, and described first LED drive current sets in the way of sequentially reducing to the n-th LED drive current, wherein, it is the first LED drive current to the n-th LED drive current by the LED drive current of each operating range。

28. LED drive circuit as claimed in claim 25, wherein,

29. LED drive circuit as claimed in claim 25, wherein,

Described LED illuminating part includes a LED group and the 2nd LED group,

30. LED drive circuit as claimed in claim 25, wherein,

Described LED illuminating part comprises a LED group and the 2nd LED group,

31. LED drive circuit as claimed in claim 25, wherein,

Described LED illuminating part comprises a LED group and the 2nd LED group,

32. LED drive circuit as claimed in claim 25, wherein, described LED drive control part also includes:

33. LED drive circuit as claimed in claim 32, wherein,

34. LED drive circuit as claimed in claim 25, wherein, described LED drive control part includes:

35. LED drive circuit as claimed in claim 34, wherein, described LED drive control part also includes:

36. LED drive circuit as claimed in claim 35, wherein,

37. LED drive circuit as claimed in claim 36, wherein,

38. LED drive circuit as claimed in claim 37, wherein,

39. LED drive circuit as claimed in claim 35, wherein,

Described LED illuminating part comprises a LED group and the 2nd LED group,

40. LED drive circuit as claimed in claim 35, wherein, described LED drive circuit also includes:

41. LED drive circuit as claimed in claim 35, wherein, described LED drive circuit also includes:

42. LED drive circuit as claimed in claim 34, wherein,

43. LED drive circuit as claimed in claim 42, wherein,

Described LED illuminating part comprises a LED group and the 2nd LED group,

44. LED drive circuit as claimed in claim 42, wherein,

45. LED drive circuit as claimed in claim 44, wherein,

46. LED drive circuit as claimed in claim 42, wherein, described LED drive circuit also includes:

47. LED drive circuit as claimed in claim 42, wherein, described LED drive circuit also includes:

48. LED drive circuit as claimed in claim 42, wherein,

49. a LED light device, including:

LED illuminating part, comprise a LED group and the 2nd LED group and constitute, and non-compensate interval in from described rectification part, described commutating voltage is received and luminous as described first driving voltage, and receive the second driving voltage and luminous from loopback compensation section in compensation interval；

Loopback compensation section, between node and LED drive control part between a described LED group and described 2nd LED group, described commutating voltage is utilized to fill energy in charging interval, and provide described second driving voltage described compensation in interval to a described LED group and described 2nd LED group, wherein, described charging interval is the first operating range；And

LED drive control part, the LED drive current that detection is flowed by being connected respectively to the constant current switch of a described LED group and described 2nd LED group, and the deformation controlling a described LED group and described 2nd LED group according to the LED drive current detected is sequentially driven

Wherein, described LED drive control part detects the charging current flowed by being connected to the constant current switch of described loopback compensation section, interval thus judging to charge enter and whether depart from, and entering the constant current switch disconnecting described 2nd LED group on the time point that charging is interval, and it is connected to the constant current switch of described 2nd LED group departing from Guan Bi on the time point that charging is interval。

50. a LED drive circuit, for controlling the driving of LED illuminating part, described LED illuminating part comprises a LED and the two LED group, and is received as the first driving voltage by the commutating voltage of all wave rectification from rectification part, and wherein, described LED drive circuit includes:

Loopback compensation section, between node and LED drive control part between a described LED group and the 2nd LED group, described commutating voltage is utilized to fill energy in charging interval, and provide the second driving voltage compensating in interval to a described LED group and described 2nd LED group, wherein, described charging interval is the first operating range；And

51. a LED light device, including:

LED illuminating part, comprise a LED group to constitute to the n-th LED group, non-compensate interval in from described rectification part, described commutating voltage is luminous as described first driving voltage reception, and compensate interval in receive the second driving voltage and luminous from loopback compensation section, wherein, n is the positive integer of more than 2；

Loopback compensation section, between node and LED drive control part between mLED group and m+1LED group, described commutating voltage is utilized to fill energy in charging interval, and provide described second driving voltage to the LED group of second group during between described the first compensating basin compensating interval, and during between described the second compensating basin compensating interval, the LED group of described second group and the LED component of first group be you can well imagine for described second driving voltage, wherein, m is the positive integer less than n, the LED group of described second group is the m+1LED group LED group to described n-th LED group, the LED group of described first group is the described LED group LED group to described mLED group；And

LED drive control part, is controlled the driving of a described LED group to the n-th LED group according to the voltage level of described commutating voltage。

52. LED light device as claimed in claim 51, wherein,

Described loopback compensation section is connected to the positive terminal of described m+1LED group by the first discharge path, and is connected to the positive terminal of a described LED group by the second discharge path。

53. LED light device as claimed in claim 51, wherein,

The LED group of described first group period between described first compensating basin is driven by described first driving voltage。

54. LED light device as claimed in claim 51, wherein,

Compensating period between interval and described second compensating basin described first, the LED group of described first group and the LED group of described second group are driven independently of each other。

55. LED light device as claimed in claim 51, wherein,

The forward voltage level of the forward voltage level of the LED group of the described first group LED group less than or equal to described second group。

56. LED light device as claimed in claim 51, wherein, described LED drive control part also includes:

First LED drive current configuration part to the n-th LED drive current configuration part, the LED drive current value corresponding to the n-th LED drive current value for setting the first LED drive current value respectively。

57. LED light device as claimed in claim 56, wherein,

58. a LED drive circuit, for controlling the driving of LED illuminating part, described LED illuminating part comprises a LED group to the n-th LED group, and from rectification part, the commutating voltage of all wave rectification is received as the first driving voltage, n is the positive integer of more than 2, and wherein, described LED drive circuit includes:

Loopback compensation section, between node and LED drive control part between mLED group and m+1LED group, described commutating voltage is utilized to fill energy in charging interval, and provide the second driving voltage to the LED group of second group during compensating between the first interval compensating basin, and during between described the second compensating basin compensating interval, the LED group of described second group and the LED component of first group be you can well imagine for described second driving voltage, wherein, m is the integer less than n, the LED group of described second group is the m+1LED group LED group to described n-th LED group, the LED group of described first group is the described LED group LED group to described mLED group；And

59. LED drive circuit as claimed in claim 58, wherein,

60. LED drive circuit as claimed in claim 58, wherein,

61. LED drive circuit as claimed in claim 58, wherein,

62. LED drive circuit as claimed in claim 58, wherein,

63. LED drive circuit as claimed in claim 58, wherein, described LED drive control part also includes:

64. the LED drive circuit as described in claim 63, wherein,