CN103281838B - A kind of circuit, method and LED drive circuit eliminating LED stroboscopic - Google Patents
A kind of circuit, method and LED drive circuit eliminating LED stroboscopic Download PDFInfo
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- CN103281838B CN103281838B CN201310224533.3A CN201310224533A CN103281838B CN 103281838 B CN103281838 B CN 103281838B CN 201310224533 A CN201310224533 A CN 201310224533A CN 103281838 B CN103281838 B CN 103281838B
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Abstract
This application discloses a kind of circuit, method and the LED drive circuit of eliminating LED stroboscopic, the circuit of described elimination LED stroboscopic, is applied in LED drive circuit, comprises: filter circuit and have the controllable devices of constant-current characteristics.For LED driver, when the load that it connects has current source characteristic, the electric current flowing through described load is not containing the direct current of alternating current component, but its output voltage is the pulsating voltage containing a small amount of alternating current component, therefore, the present invention utilizes described controllable devices to provide constant current to LED load, the electric current flowing through LED load is made to be not containing the direct current of alternating current component, to eliminate LED stroboscopic, and utilize the alternating current component of filter circuit filtering output voltage, make the voltage in LED load also be not containing the direct voltage of alternating current component.
Description
Technical field
The application relates to electric and electronic technical field, particularly relates to a kind of circuit, method and the LED drive circuit of eliminating LED stroboscopic.
Background technology
LED(LightingEmittingDiode, light-emitting diode), there is the features such as energy-saving and environmental protection, efficient, safety, therefore, be widely used in the illumination occasions such as view, street lamp and electronic product backlight.
Generally, LED drive circuit is all adopt constant-current driving LED loaded work piece.As shown in Figure 1a, traditional LED drive circuit comprises LED driver 1 and output capacitance C
out, electric main (operating frequency is 50Hz) is converted to direct current and is supplied to LED load by LED driver 1, and concrete, LED driver 1 is by electric main V
inafter over commutation, then be converted to direct current and be supplied to LED load.But the drive current exporting to LED load due to LED driver includes the alternating current component of about 100Hz, thus when causing LED luminous, there will be the stroboscopic phenomenon that human eye can perceive.
Refer to Fig. 1 b, show the key operation waveforms figure in circuit shown in Fig. 1 a, assuming that the power factor of LED driver 1 is 1, electric main V
induring for sine wave, then the input current i of LED driver
infor sine wave, Instantaneous input power P
inthe pulsating power of Sine-squared form, and power output P
obe straight power, the voltage at LED load two ends can think straight voltage, flows through the current i of LED load
lEDin containing the alternating current component of about 100Hz, cause the stroboscopic phenomenon occurring that human eye can perceive, therefore, be badly in need of a kind of circuit can eliminating LED stroboscopic.
Summary of the invention
For solving the problems of the technologies described above, the embodiment of the present application provides a kind of circuit, method and the LED drive circuit of eliminating LED stroboscopic, and to realize eliminating the stroboscopic phenomenon in LED load, technical scheme is as follows:
The application provides a kind of circuit eliminating LED stroboscopic, be applied in LED drive circuit, described LED drive circuit comprises LED driver and output capacitance, wherein, the two ends of described output capacitance are parallel between two outputs of described LED driver as the output of described LED drive circuit, comprise: filter circuit and the controllable devices with constant-current characteristics, wherein:
Described filter circuit is parallel to the two ends of described output capacitance, for the alternating voltage ripple in the output voltage of LED drive circuit described in filtering;
First power end and the second power end of described controllable devices are connected between described output capacitance and LED load, provide not containing alternating current component and constant direct driving current to give described LED load.
Preferably, described filter circuit comprises resistance and filter capacitor, one end of described resistance connects one end of described output capacitance, and the other end of described resistance connects one end of described filter capacitor, and the other end of described filter capacitor connects the other end of described output capacitance.
Preferably, described controllable devices is metal-oxide-semiconductor, and the first power end of described metal-oxide-semiconductor connects one end of described output capacitance, and the second power end connects the positive ends of described LED load, and control end connects the common port of described resistance and described filter capacitor.
Preferably, the time constant of described filter circuit is not less than 10ms.
The application also provides a kind of LED drive circuit, comprises LED driver, output capacitance, also comprises the circuit of above-mentioned elimination LED stroboscopic;
The input of described LED driver connects AC power;
One end of described output capacitance connects the cathode output end of described LED driver, and the other end of described output capacitance connects the cathode output end of described LED driver;
The circuit of described elimination LED stroboscopic is connected between described output capacitance and described LED load.
The application also provides a kind of method eliminating LED stroboscopic, is applied in the circuit of above-mentioned elimination LED stroboscopic, comprises:
The controllable devices with constant-current characteristics is utilized not contain alternating current component and constant direct driving current for described LED load provides;
By the alternating voltage ripple in the output voltage of LED drive circuit described in filter circuit filtering.
Preferably, when described controllable devices is metal-oxide-semiconductor, the controllable devices that described utilization has a constant-current characteristics to provide not containing alternating current component and the process of constant direct driving current is specially for described LED load:
Control described metal-oxide-semiconductor and work in constant current district, and control the grid-source voltage constant of described metal-oxide-semiconductor, to make the constant current hold of the drain-source pole flowing through described metal-oxide-semiconductor.
The circuit of the elimination LED stroboscopic that the application provides, method and LED drive circuit, the circuit of described elimination LED stroboscopic, be applied in LED drive circuit, the characteristic of the load connected due to LED driver has a certain impact to the voltage and current that LED driver exports, obtain by experiment, when the load that LED driver connects has current source characteristic, flow through the electric current of described load substantially not containing alternating current component, but the output voltage of LED driver contains a small amount of alternating current component, therefore, the present invention is produced by the circuit of described elimination LED stroboscopic and does not work containing the DC driven LED load of alternating current component, and utilize the alternating current component in the output voltage of filter circuit filtering LED drive circuit, thus the alternating current in elimination LED load, voltage ripple, the stroboscopic phenomenon of final elimination LED load.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, the accompanying drawing that the following describes is only some embodiments recorded in the application, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 a is the structural representation of traditional LED drive circuit;
Fig. 1 b is the key operation waveforms schematic diagram in circuit shown in Fig. 1 a;
Fig. 2 a is the equivalent structure schematic diagram of LED load;
Fig. 2 b is the load of LED drive circuit is the theory diagram of LED load;
Fig. 2 c is the load of LED drive circuit is the theory diagram of voltage source;
Fig. 2 d is the load of LED drive circuit is the theory diagram of current source;
A kind of structural representation eliminating the circuit of LED stroboscopic that Fig. 3 provides for the embodiment of the present application;
The structural representation of a kind of LED drive circuit that Fig. 4 provides for the embodiment of the present application;
A kind of method flow schematic diagram eliminating LED stroboscopic that Fig. 5 provides for the embodiment of the present application.
Embodiment
The circuit of elimination LED stroboscopic provided by the invention, is applied in LED drive circuit, on the basis of existing LED drive circuit, improves its output, thus eliminate LED stroboscopic phenomenon.
Concrete, as shown in Figure 2 a, LED load to simplify the analysis, is equivalent to resistance R by LED
lEDwith there is a constant pressure drop (VF
lED) Diode series, now, the output current ripple i of LED drive circuit
ripplecomputing formula as follows:
In above formula, R
lEDfor the resistance R in LED equivalent structure
lEDresistance, C
outfor the output capacitance C in LED drive circuit
outcapacitance.
When the characteristic of the load that LED drive circuit connects is different, its voltage ripple exported and current ripples are also by difference, specifically for the output voltage of LED drive circuit be 40V, output current analyzes for 400mA, specifically see the circuit diagram shown in Fig. 2 b-Fig. 2 d, Fig. 2 b is the load of LED drive circuit is the theory diagram of LED load, Fig. 2 c is the load of LED drive circuit is the theory diagram of voltage source, and Fig. 2 d is the load of LED drive circuit is the theory diagram of current source.
As shown in Figure 2 b, when load is LED load, because LED load has constant-voltage characteristic, then the voltage at LED load two ends can think straight voltage, but the electric current flowing through LED load is the pulsating current of the alternating current component containing about 100Hz, according to formula 1, its current ripples is very large, and the result of calculation of concrete output ripple content is: voltage ripple v
ripple=7%, current ripples i
ripple=45.1%.
As shown in Figure 2 c, when load is voltage source, because voltage source has constant-voltage characteristic, so the output voltage of LED drive circuit is the straight voltage of not pulsation, and output current is the pulsating current of the alternating current component containing about 100Hz, and current ripples is very large, the result of calculation of concrete output ripple content is: voltage ripple v
ripple=0%, current ripples i
ripple=200%.
As shown in Figure 2 d, when load is current source, because current source has constant-current characteristics, so the output current of LED drive circuit is the straight electric current of not pulsation, and output voltage pulsation is very little, and the result of calculation of concrete output ripple content is: voltage ripple v
ripple=7.2%, current ripples i
ripple=0%.
From above-mentioned experiment analysis results, core concept of the present invention is: if output loading in parallel after LED driver and output capacitance equivalence can regard the output loading with current source characteristic as, then in theory, the output current ripple of LED drive circuit can be reduced to zero, now can eliminate the pulsating current of the alternating current component of about the 100Hz comprised in the output current of LED drive circuit completely, thus eliminate LED stroboscopic phenomenon, but, now the output voltage of LED drive circuit has less pulsation, therefore the ripple content of the output voltage reducing LED drive circuit is needed, its output voltage is made to be not containing the straight voltage of ripple.
Technical scheme in the application is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present application, technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all should belong to the scope of the application's protection.
Refer to Fig. 3, show a kind of structural representation eliminating the circuit of LED stroboscopic of the embodiment of the present application, the circuit application of described elimination LED stroboscopic is in LED drive circuit, and described LED drive circuit comprises LED driver 1, output capacitance C
out, output capacitance C
outbetween two outputs being parallel to described LED driver 1, output capacitance C
outone end connect the cathode output end of LED driver, output capacitance C
outthe other end connect the cathode output end of LED driver.
Concrete, output capacitance C
outcan be realized by electrochemical capacitor, output capacitance C
outpositive ends connect the cathode output end of LED driver, output capacitance C
outnegative polarity end connect the cathode output end of LED driver.
The circuit of described elimination LED stroboscopic comprises filter circuit 100, controllable devices 200, wherein:
Filter circuit 100 is parallel to output capacitance C
outtwo ends, with the pulsating voltage of the alternating current component contained by the output voltage of filtering LED driver, make the voltage at LED load two ends be a straight voltage.
Preferably, filter circuit 100 can be made up of resistance and filter capacitor, can be changed the time constant of filter circuit by the value of regulating resistance or filter capacitor, and then can the alternating current component of filtering different frequency.
During concrete enforcement, filter circuit 100 comprises the resistance R and filter capacitor C that are connected in series, and wherein, one end of resistance R is connected to output capacitance C
outthe one end be connected with the cathode output end of LED driver, the other end of resistance R connects one end of filter capacitor C, and the other end of filter capacitor C is connected to output capacitance C
outthe one end be connected with the cathode output end of LED driver.
The alternating current component of about the 100Hz that can comprise in the output voltage of filtering LED drive circuit to make filter circuit 100, timeconstantτ can be arranged on is not less than in the scope of 10ms, wherein τ=RC, R are the resistance of the resistance R in filter circuit 100, and C is the capacitance of filter capacitor C.Usually timeconstantτ is set to 100ms, now, filter circuit 100 can the low-limit frequency of filtering AC ripple be 10Hz, thus makes the voltage at LED load two ends be straight voltage.
First power end and the second power end of controllable devices 200 are connected on output capacitance C
outand between LED load, think that LED load provides not containing alternating current component and constant direct driving current.
Preferably, controllable devices 200 can be metal-oxide-semiconductor M, and concrete can manage for N-MOS, or P-MOS pipe, and the first power end of controllable devices 200, the second power end, control end are respectively N-MOS pipe or the drain electrode of P-MOS pipe, source electrode, grid;
Concrete, the drain electrode of N-MOS pipe or P-MOS pipe is connected to described output capacitance C
outthe one end be connected with the cathode output end of LED driver 1, the source electrode of N-MOS pipe or P-MOS pipe connects the positive ends of LED load, and the grid of N-MOS pipe or P-MOS pipe connects the common port of described resistance R and filter capacitor C.
Due to the cut-in voltage V of metal-oxide-semiconductor M
tHfor constant, when it is in constant current district, if the voltage V of its grid-source electrode
gSconstant, then flow through the electric current I of drain-source pole
dSinvariable.Because metal-oxide-semiconductor has above-mentioned characteristic, therefore, only need control metal-oxide-semiconductor is operated in constant current district, and makes V
gSinvariable, then metal-oxide-semiconductor has constant-current characteristics, makes LED load electric current be not containing the direct current of alternating current component.
To eliminate the stroboscopic phenomenon of LED load, metal-oxide-semiconductor must be made to be operated in constant current district, then to require that the voltage ripple of output capacitance meets the following conditions:
Wherein, V
cout,
ripplefor output capacitance C
outripple value, V
tHfor the cut-in voltage of metal-oxide-semiconductor M.
The operation principle of the circuit of the stroboscopic of the elimination LED that the present embodiment provides is as follows:
Metal-oxide-semiconductor is in conducting state always, now LED load is connected with LED drive circuit, output capacitance C
outthe voltage at two ends comprises the alternating current component of about 100Hz, and the alternating voltage ripple of filter circuit 100 filtering about 100Hz, makes the voltage at LED load two ends be straight voltage, and there is following relational expression:
V
c=V
lED+ V
gS(formula 3)
Wherein, V
cfor the voltage on filter capacitor C, V
lEDfor the voltage at LED load two ends, V
gSfor the voltage of metal-oxide-semiconductor grid-source electrode.
Due to the voltage V of filter capacitor C
csubstantially constant, the voltage V at LED load two ends
lEDalso be straight voltage, according to formula 3, V
gSsubstantially constant.
When metal-oxide-semiconductor is operated in constant current district, if V
gSconstant, then the corresponding electric current I flowing through drain-source pole
dSalso constant, namely the electric current flowing through LED load does not comprise the alternating current component of about 100Hz, also the circuit of elimination LED stroboscopic that namely the present embodiment provides can eliminate the pulsating current of the alternating current component of about the 100Hz in the output current of LED drive circuit, thus eliminates the stroboscopic phenomenon of LED load.
Corresponding to the circuit of above-mentioned elimination LED stroboscopic, the application also provides a kind of LED drive circuit.
Refer to Fig. 4, described LED drive circuit, comprise LED driver 1 and output capacitance C
out, and the circuit 10 of elimination LED stroboscopic that above-described embodiment provides.
The input of LED driver 1 connects electric main V
in, output is parallel with output capacitance C
out, the circuit 10 eliminating LED stroboscopic is connected between described LED driver 1 and LED load, electric main V
inchange direct current into through LED driver and be supplied to LED load, but the output current of LED driver 1 is current ripples containing alternating current component, circuit 10 through eliminating LED stroboscopic eliminates the AC ripple in the output current of LED driver 1, thus eliminate the AC ripple flowing through LED, and then eliminate the stroboscopic phenomenon of LED, meanwhile, the circuit 10 of utilization elimination LED stroboscopic eliminates the AC ripple in the output voltage of LED driver 1, makes the voltage at LED two ends be straight voltage.
The LED drive circuit that the present embodiment provides can eliminate the alternating current component flow through in the electric current of LED, thus eliminates LED stroboscopic phenomenon.
Corresponding to the circuit of above-mentioned elimination LED stroboscopic, the application also provides a kind of method eliminating LED stroboscopic, and as shown in Figure 5, the method is applied in the circuit of above-mentioned elimination LED stroboscopic, comprises the following steps:
101, utilize the controllable devices with constant-current characteristics to be that LED load provides not containing alternating current component and constant direct driving current;
During concrete enforcement, described controllable devices can be realized by metal-oxide-semiconductor, due to the cut-in voltage V of metal-oxide-semiconductor
tHfor constant, when it is in constant current district, if the voltage V between its grid-source electrode
gSconstant, then flow through the electric current I of drain-source pole
dSinvariable, now, metal-oxide-semiconductor has constant-current characteristics, and after metal-oxide-semiconductor is connected with LED load, making to flow through LED load electric current is not containing the direct current of alternating current component.
102, by the AC ripple in the output voltage of filter circuit filtering LED drive circuit.
During concrete enforcement, described filter circuit can comprise resistance and filter capacitor, and being changed by the numerical value of regulating resistance, filter capacitor can the frequency of alternating current component of filtering.
It should be noted that, above-mentioned step 101 and step 102 can be carried out simultaneously, can also be first perform step 102, then perform step 101.
The method of the elimination LED stroboscopic that the present embodiment provides, by the ac current ripple eliminated and flow through LED load of LED load being connected with the controllable devices with constant-current characteristics, thus eliminates the stroboscopic phenomenon of LED.
The above is only the embodiment of the application; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the application's principle; can also make some improvements and modifications, these improvements and modifications also should be considered as the protection range of the application.
Claims (4)
1. eliminate the circuit of LED stroboscopic for one kind, be applied in LED drive circuit, described LED drive circuit comprises LED driver and output capacitance, wherein, the two ends of described output capacitance are parallel between two outputs of described LED driver as the output of described LED drive circuit, it is characterized in that, comprising: filter circuit and the controllable devices with constant-current characteristics, wherein:
Described filter circuit is parallel to the two ends of described output capacitance, for the alternating voltage ripple in the output voltage of LED drive circuit described in filtering, described filter circuit comprises resistance and filter capacitor, one end of described resistance connects one end of described output capacitance, the other end of described resistance connects one end of described filter capacitor, and the other end of described filter capacitor connects the other end of described output capacitance;
First power end and the second power end of described controllable devices are connected between described output capacitance and LED load, there is provided not containing alternating current component to give described LED load, and constant direct driving current, described controllable devices is metal-oxide-semiconductor, first power end of described metal-oxide-semiconductor connects one end of described output capacitance, second power end connects the positive ends of described LED load, control end connects the common port of described resistance and described filter capacitor, described metal-oxide-semiconductor is operated in constant current district, and the voltage constant between described metal-oxide-semiconductor grid-source electrode, make the current constant flowing through drain-source pole, the electric current flowing through LED load is made not comprise alternating current component.
2. the circuit of elimination LED stroboscopic according to claim 1, it is characterized in that, the time constant of described filter circuit is not less than 10ms.
3. a LED drive circuit, comprises LED driver, output capacitance, it is characterized in that, also comprises the circuit of the elimination LED stroboscopic described in any one of claim 1-2;
The input of described LED driver connects AC power;
One end of described output capacitance connects the cathode output end of described LED driver, and the other end of described output capacitance connects the cathode output end of described LED driver;
The circuit of described elimination LED stroboscopic is connected between described output capacitance and described LED load.
4. eliminate a method for LED stroboscopic, be applied in the circuit described in any one of claim 1-2, it is characterized in that, comprising:
The controllable devices with constant-current characteristics is utilized not contain alternating current component and constant direct driving current for described LED load provides;
By the alternating voltage ripple in the output voltage of LED drive circuit described in filter circuit filtering;
When described controllable devices is metal-oxide-semiconductor, the controllable devices that described utilization has a constant-current characteristics to provide not containing alternating current component and the process of constant direct driving current is specially for described LED load:
Control described metal-oxide-semiconductor and work in constant current district, and control the grid-source voltage constant of described metal-oxide-semiconductor, to make the constant current hold of the drain-source pole flowing through described metal-oxide-semiconductor, make the electric current flowing through LED load not comprise alternating current component.
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| CN201310224533.3A CN103281838B (en) | 2013-06-05 | 2013-06-05 | A kind of circuit, method and LED drive circuit eliminating LED stroboscopic |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103840647B (en) * | 2014-03-18 | 2016-02-17 | 矽力杰半导体技术(杭州)有限公司 | Current filtering circuit and supply convertor |
| CN104202876B (en) | 2014-09-01 | 2016-10-05 | 矽力杰半导体技术(杭州)有限公司 | The LED drive circuit of a kind of single inductance and driving method |
| CN104202874B (en) | 2014-09-01 | 2016-10-05 | 矽力杰半导体技术(杭州)有限公司 | The LED drive circuit of a kind of single inductance and driving method |
| CN106941752B (en) * | 2017-05-05 | 2019-05-31 | 矽力杰半导体技术(杭州)有限公司 | Ripple suppression circuit and LED driver |
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