CN103634974A - LED drive circuit structure with dark area filling function - Google Patents
LED drive circuit structure with dark area filling function Download PDFInfo
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- CN103634974A CN103634974A CN201210308745.5A CN201210308745A CN103634974A CN 103634974 A CN103634974 A CN 103634974A CN 201210308745 A CN201210308745 A CN 201210308745A CN 103634974 A CN103634974 A CN 103634974A
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Abstract
The invention relates to an LED drive circuit structure with a dark area filling function. The LED drive circuit structure comprises a rectification unit, a dark area filling unit, and an LED multi-order voltage constant current driving unit. The LED drive circuit structure is mainly applied to multi-order linearly-driven LED lighting lamps. According to the LED drive circuit structure with the dark area filling function, the dark area filling unit is additionally mounted in a drive circuit provided with the rectification unit and the LED multi-order voltage constant current driving unit. With the LED drive circuit structure with the dark area filling function adopted, the light emission of an LED is stable, and flicker caused by a dark area effect which is further caused by the influence of power supply voltage level changes can be avoided, and luminous efficiency of the lighting of the LED is improved, and a perfect luminous effect of the LED can be realized.
Description
Technical field
The present invention relates to the LED drive circuit structure that a kind of tool dark space is filled up, particularly relate to the linear constant current of a kind of multistage voltage and drive, and the LED drive circuit structure filled up of tool dark space.
Background technology
As shown in Figure 1, for the linear constant-current drive circuit structure of existing known multistage voltage LED, its be mainly by diagram in RG to input AC alternating current (AC+, AC-) do rectification, by the input voltage after rectification (Vin) and input current (Iin), form supply voltage and current source, relend by driving chip U1 to control the luminous of each LED (LED1-LED3).Drive in chip U1 and have by voltage control conducting whether constant current source so that the some light current of each LEDs of flowing through is a fixed value.In addition, the PS1 in figure is the passive device unit that resistance or electric capacity form.
Existing multistage voltage LED linear constant current drive mode as shown in Figure 1, its disadvantage is that each cycle of input voltage (Vin) all has the magnitude of voltage of a specific region to be reduced to cannot driving LED, at this moment between in without any a LEDs, can be lit.The alternating current 60Hz of take power supply is example (Taiwan be), and the frequency of Vin is 120Hz, i.e. once dark space appearance in namely every 1/120 second.When the LED lighting device of a multistage voltage driving has dark space to occur, it shows that actual state is the flicker of houselights, and the flicker of houselights is often a puzzlement greatly that is required improvement on the living conditions.Therefore, the improvement in the application of consideration real life and the increase of the luminous efficiency of LED lighting device own, the invention that technology is filled up in dark space will become with improvement the key project that this stage LED illumination develops.
Summary of the invention
The present invention is the LED drive circuit structure that a kind of tool dark space is filled up, and it comprises a rectification unit, a dark space shim, and a LED multistage voltage constant current driving unit.By enforcement of the present invention, can make the stable luminescence of illumination LED, not produce the impact changing because of supply voltage quasi position and produce the flicker that dark space effect causes, the luminous efficiency of LED illumination is promoted, its application can reach more perfect luminous efficacy.
For reaching above-mentioned effect, the invention provides the LED drive circuit structure of filling up a kind of tool dark space and comprise in order to the LED drive circuit structure that drives the ，Ci Ju dark space, LED unit of at least two group serial connections to fill up: a rectification unit; One dark space shim, its output is in order to the overall presure drop of LED unit to be provided, and dark space shim includes again one first electric capacity, one first diode, one second diode, one second electric capacity and one the 3rd diode; And a LED multistage voltage constant current driving unit, be electrically connected at the output of dark space shim and the strangulation voltage of output at least two groups respectively to different LED.
By enforcement of the present invention, at least can reach following progressive effect:
1, the luminous supply-voltage source that can not be subject to of illumination LED, in the impact of low-voltage dark space, reaches the more perfect luminous efficacy of flicker free.
2, not only there is the function of protecting user's eyes, more can increase the luminous efficiency of illumination LED light fixture.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to better understand technological means of the present invention, and can be implemented according to the content of specification, and for above and other object of the present invention, feature and advantage can be become apparent, below especially exemplified by preferred embodiment, and coordinate accompanying drawing, be described in detail as follows.
Accompanying drawing explanation
Fig. 1 is existing known a kind of illumination LED drive circuit figure.
Fig. 2 is that the LED drive circuit structure that a kind of tool of the present invention dark space is filled up is implemented illustration.
Fig. 3 is that the dark space shim of a kind of LED drive circuit of the present invention is implemented illustration.
Fig. 4 is that the charged state of a kind of dark space of the present invention shim is implemented illustration.
Fig. 5 is that the discharge condition of a kind of dark space of the present invention shim is implemented illustration.
Fig. 6 A is that existing known illumination LED drive circuit produces dark space voltage oscillogram.
Fig. 6 B is each time zone of correspondence LED1-LED3 light and shade table of Fig. 6 A.
Fig. 7 A is that voltage waveform enforcement illustration is filled up in the LED drive circuit structure dark space that a kind of tool of the present invention dark space is filled up.
Fig. 7 B is each time zone of correspondence LED1-LED3 light and shade table of Fig. 7 A.
[main element symbol description]
100 existing known illumination LED drive circuit structures
The LED drive circuit structure that 200 tool dark spaces are filled up
10 rectification unit 20 dark space shim
C1 the first capacitor C 2 second electric capacity
D1 first diode D2 the second diode
D3 the 3rd diode 21 first ends
22 the second ends 23 the 3rd end
24 the 4th ends
30 LED multistage voltage constant current driving unit
Vin input voltage Iin input current
PS1 passive device Ic1-Ic3 constant current source
SW1-SW3 diverter switch
Embodiment
Fig. 1 is existing known a kind of illumination LED drive circuit figure.Fig. 2 is that the LED drive circuit structure that a kind of tool of the present invention dark space is filled up is implemented illustration.Fig. 3 is that the dark space shim of a kind of LED drive circuit of the present invention is implemented illustration.Fig. 4 is that the charged state of dark space shim is implemented illustration.Fig. 5 is that the discharge condition of dark space shim is implemented illustration.Fig. 6 A is that existing known illumination LED drive circuit produces dark space voltage oscillogram.Fig. 6 B is each time zone of correspondence LED1-LED3 light and shade table of Fig. 6 A.Fig. 7 A is that voltage waveform enforcement illustration is filled up in the LED drive circuit structure dark space that a kind of tool of the present invention dark space is filled up.Fig. 7 B is each time zone of correspondence LED1-LED3 light and shade table of Fig. 7 A.
As shown in Figure 2, be the LED drive circuit structure 200 that a kind of tool of the present invention dark space is filled up, it comprises: a rectification unit 10, a dark space shim 20, a LED multistage voltage constant current driving unit 30.Dark space shim 20 includes again: one first capacitor C 1, one second capacitor C 2, one first diode D1, one second diode D2 and one the 3rd diode D3.Figure 2 shows that the embodiment of three serial connection illumination LEDs, but the quantity of illumination LED is not as limit.
As the Ic1-Ic3 in Fig. 2 is respectively three constant current sources in LED multistage voltage constant current driving unit 30, its fixed current value is to light the setting current value of LED, and by tri-diverter switches of SW1-SW3, is controlled respectively.In same ON time, in Ic1-Ic3, only there is a meeting via SW1 or SW2 or SW3 conducting.Its manner of execution is: when only LED1 conducting is shinny, only have Ic1 via SW1 conducting, wherein SW1 is connected by 50V voltage control; When LED1 and LED2 conducting are shinny, only have Ic2 via SW2 conducting, wherein SW2 is connected by 100V voltage control; When LED1 and LED2 and LED3 conducting are shinny, only have Ic3 via SW3 conducting, wherein SW3 is connected by 140V voltage control; So can guarantee regardless of several LEDs of conducting, the electric current of the LED of all conductings of process is all the electric current of determining of formed objects.
As shown in Figure 3, for a kind of dark space of the present invention shim 20, its directly use in parallel with illumination LED, and when input voltage vin is too low, in order to the minimum voltage that provides the first rank LED of LED unit to light, so that illumination LED does not glimmer, dark space shim 20 includes one first capacitor C 1, one first diode D1, one second diode D2, one second capacitor C 2, and one the 3rd diode D3.
The first capacitor C 1, it has a first end 21 and a second end 22, first end 21 is electrically connected at the output of this rectification unit 10, the first capacitor C 1 is as the element of a store electrical energy, by input voltage vin and the input current Iin input charge of first end 21 and be stored in the first capacitor C 1, and when the input voltage vin of first end 21 is not enough to drive an illumination LED, by the first capacitor C 1 output voltage supply of electrical energy.
The first diode D1, its negative pole end is electrically connected at this second end 22, its positive terminal ground connection; When the input voltage vin of first end 21 is charged to the first capacitor C 1, the first diode D1 is reverse, not conducting.
The second diode D2, its negative pole end is electrically connected at first end 21, and first end 21 is in order to provide the total voltage of at least two illumination LED unit, rank; When the input voltage vin of first end 21 is charged in power supply and to the first capacitor C 1, the second diode D2 is also reverse, not conducting.
The second capacitor C 2, it has the positive terminal that one the 3rd end 23 and 24, the three ends 23, one the 4th end are electrically connected at the second diode D2, the 4th 24 of ends ground connection; The second capacitor C 2 is also as the element of a store electrical energy, by input voltage vin and the input current I in input charge of first end 21 and be stored in the second capacitor C 2, and when the input voltage vin of first end 21 is not enough to drive an illumination LED, the second capacitor C 2 and the first capacitor C 1 output voltage supply of electrical energy.Wherein the stored voltage of the first capacitor C 1 and the second capacitor C 2 all can be selected in 70V (volt).
The 3rd diode D3, its positive terminal is electrically connected at the second end 22, and its negative pole end is electrically connected at the 3rd end 23; When the input voltage vin of first end 21 is charged in power supply and to the first capacitor C 1, the 3rd diode D3 forms conducting state, and rechargeable electrical energy just can flow into 2 pairs of the second capacitor C 2 chargings of the second capacitor C.
LED multistage voltage constant current driving unit 30, is electrically connected at the output of dark space shim 20 and the negative pole end of strangulation voltage respectively to one LED of output at least two groups; The embodiment of three illumination LEDs of tool in Fig. 2 of take is explanation, this LED multistage voltage constant current driving unit 30 is lighted the strangulation of voltage difference at 50V, 50V, 40V by LED1, LED2, LED3's, and the electric current that flows through all LED of serial connection is fixed on to a specific current value; That is light LED1 and need 50V voltage, light LED1+LED2 and need 100V voltage, light LED1+LED2+LED3 and need 140V voltage.
As shown in Figure 4, charged state embodiment for a kind of dark space of the present invention shim 20, dark space shim 20 is in the first diode D1 and the reverse not conducting of the second diode D2 during higher than the stored voltage of the first capacitor C 1 and the second capacitor C 2 of the input voltage vin of first end 21, and the 3rd forward conducting of diode D3, the input voltage vin of first end 21 just can be to the first capacitor C 1 and the second capacitor C 2 chargings.
As shown in Figure 5, discharge condition embodiment for a kind of dark space of the present invention shim 20, dark space shim 20 is in the first diode D1 and the second forward conducting of diode D2 during lower than the stored voltage of the first capacitor C 1 and the second capacitor C 2 of the input voltage vin of first end 21, and the reverse not conducting of the 3rd diode D3, now the first capacitor C 1 and the second capacitor C 2 just discharge electric energy, the voltage of supply 70V-50V, lights LED1.
As shown in Figure 6A, for existing known illumination LED drive circuit produces dark space schematic diagram, shown in figure, be the input voltage vin curve of first end 21 after bridge full-wave rectifier, its for direct voltage and between 0 to 155V in time with the frequency change (take Taiwan as example) of 120Hz.Again as shown in Figure 6A, voltage quasi position 50V, the 100V, the 140V that light a LED (LED1), two LED (LED1+LED2), three LED (LED1+LED2+LED3) can be drawn respectively, and input voltage vin is divided into 7 regions according to this (1.-7.).By Fig. 6 A, can be found out, the magnitude of voltage that the magnitude of voltage in Ji⑦ district, input voltage Vi n ① district is all less than 50V ，Ci Liang district has been not enough to light LED1, therefore more cannot light 2 or 3 LED, now 3 LED do not light entirely, form dark space, for causing the reason of illumination flicker.
As shown in Figure 6B, bright (ON) or the secretly form demonstration of (OFF) that for existing each LED of known illumination LED drive circuit, according to input voltage vin curve, produce.With reference to the form shown in Fig. 6 A and Fig. 6 B, more can know and find out that LED1, LED2 in Ji⑦ district, ① district, LED3 are neither shinny, obviously form lighting dark space.
As shown in Figure 7 A, for adding the input voltage vin curve of a kind of dark space of the present invention shim 20 rear first ends 21, when input voltage vin is greater than the first capacitor C 1 and adds the stored voltage electricity summation of the second capacitor C 2 (70V+70V=140V), input voltage vin starts the first capacitor C 1 and the second capacitor C 2 chargings, charge path as shown in Figure 4, now input voltage vin is enough lighted one to three LED, and no dark space occurs.And when the input voltage vin of first end 21 is less than 70V, the first capacitor C 1 and the second capacitor C 2 just start electric discharge, discharge path as shown in Figure 5, via a selected capacitance, just can determine the capacitance characteristic of the velocity of discharge, the discharge time of the first capacitor C 1 and the second capacitor C 2 the first capacitor C 1 and second capacitor C 2 continuous discharges maintain voltage more than 50V till the voltage curve of input voltage vin passes through 70V downwards to start upwards to pass through 70V to the voltage curve of next periodical input voltage Vin, the electric energy being stored by the first capacitor C 1 and the second capacitor C 2 in this section of capacitor discharge time is lighted LED1, and when input voltage vin is above higher than 70V, by input voltage vin, light successively LED1 again, LED1+LED2, and LED1+LED2+LED3.
More than can finding out that by Fig. 7 A the voltage quasi position of input voltage vin can maintain 50V always, therefore, the LED of all serial connections I haven't seen you for ages in a free bright LEDs 1, the magnitude of voltage in Ji⑦ district, input voltage vin ① district has been not less than 50V all, dark space thereby elimination, illumination LED no longer includes scintillation and occurs.
Again as shown in Figure 7 B, for each LED after adding a kind of dark space of the present invention shim 20 shows according to bright (ON) of the generation of input voltage vin curve or the form of dark (OFF).With reference to the form shown in Fig. 7 A and Fig. 7 B, can know again and find out that in Ji⑦ district, ① district, LED1 is shinny, obviously fill up lighting dark space.That is after adding a kind of dark space of the present invention shim 20, no matter whether input voltage vin is lower than 50V, minimum have a LEDs meeting shinny, and dark space obtains and fills up, and LED illumination also can be again because dark space produces scintillation.
The above, it is only preferred embodiment of the present invention, not the present invention is done to any pro forma restriction, although the present invention discloses as above with preferred embodiment, yet not in order to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, when can utilizing the technology contents of above-mentioned announcement to make a little change or being modified to the equivalent embodiment of equivalent variations, in every case be the content that does not depart from technical solution of the present invention, any simple modification of above embodiment being done according to technical spirit of the present invention, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (3)
1. the LED drive circuit structure that tool dark space is filled up, in order to drive at least two group LED unit, is characterized in that, this LED drive circuit structure comprises:
One rectification unit;
One dark space shim, the minimum voltage of its output in order to provide the first rank LED of above-mentioned LED unit to light, this dark space shim comprises again:
One first electric capacity, it has a first end and a second end, and this first end is electrically connected at the output of this rectification unit;
One first diode, its negative pole end is electrically connected at this second end, its positive terminal ground connection;
One second diode, its negative pole end is electrically connected at this first end;
One second electric capacity, it has one the 3rd end and one the 4th end, and the 3rd end is electrically connected at the positive terminal of this second diode, the 4th end ground connection; And
One the 3rd diode, its positive terminal is electrically connected at this second end, and its negative pole end is electrically connected at the 3rd end; And
One LED multistage voltage constant current driving unit, is electrically connected at the output of this dark space shim and the strangulation voltage of output at least two groups respectively to the negative pole end of above-mentioned LED.
2. LED drive circuit structure as claimed in claim 1, is characterized in that wherein this rectification unit is a bridge full wave rectifier.
3. a dark space shim for LED drive circuit, is characterized in that it comprises:
One first electric capacity, it has a first end and a second end, and this first end is electrically connected at the output of a rectification unit;
One first diode, its negative pole end is electrically connected at this second end, its positive terminal ground connection;
One second diode, its negative pole end is electrically connected at this first end, and this negative pole end is in order to provide the total voltage of one at least two illumination LED unit, rank again;
One second electric capacity, it has one the 3rd end and one the 4th end, and the 3rd end is electrically connected at the positive terminal of this second diode, the 4th end ground connection; And
One the 3rd diode, its positive terminal is electrically connected at this second end, and its negative pole end is electrically connected at the 3rd end.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210308745.5A CN103634974A (en) | 2012-08-27 | 2012-08-27 | LED drive circuit structure with dark area filling function |
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| CN201210308745.5A CN103634974A (en) | 2012-08-27 | 2012-08-27 | LED drive circuit structure with dark area filling function |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201636622U (en) * | 2010-04-06 | 2010-11-17 | 吴全华 | Digital controllable light alternating-current direct drive integrated LED illuminating lamp |
| CN201766755U (en) * | 2010-09-10 | 2011-03-16 | 无锡市爱芯科微电子有限公司 | Constant current driving power supply of LED |
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- 2012-08-27 CN CN201210308745.5A patent/CN103634974A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201636622U (en) * | 2010-04-06 | 2010-11-17 | 吴全华 | Digital controllable light alternating-current direct drive integrated LED illuminating lamp |
| CN201766755U (en) * | 2010-09-10 | 2011-03-16 | 无锡市爱芯科微电子有限公司 | Constant current driving power supply of LED |
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Application publication date: 20140312 |