CN103281838A - Circuit and method for eliminating LED stroboflash and LED drive circuit - Google Patents
Circuit and method for eliminating LED stroboflash and LED drive circuit Download PDFInfo
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- CN103281838A CN103281838A CN2013102245333A CN201310224533A CN103281838A CN 103281838 A CN103281838 A CN 103281838A CN 2013102245333 A CN2013102245333 A CN 2013102245333A CN 201310224533 A CN201310224533 A CN 201310224533A CN 103281838 A CN103281838 A CN 103281838A
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Abstract
The invention discloses a circuit and method for eliminating LED stroboflash and an LED drive circuit. The circuit for eliminating the LED stroboflash is applied to the LED drive circuit. The circuit for eliminating the LED stroboflash comprises a filter circuit and a controllable device with a constant-current characteristic. With regard to an LED driver, when a load connected with the LED driver has a current source characteristic, the current which flows through the load is direct current without alternating components, and output voltages of the LED driver is pulsating voltages with a few alternating components. Therefore, the controllable device is used for providing constant current for the LED load, then the current which flows through the LED load is the direct current without the alternating components, therefore the LED stroboflash is eliminated, the filter circuit is used for filtering the alternating components of the output voltages, and then the voltages on the LED load are also direct current voltages without the alternating components.
Description
Technical field
The application relates to electric and electronic technical field, particularly relates to a kind of circuit, method and led drive circuit of the LED of elimination stroboscopic.
Background technology
LED(Lighting Emitting Diode, light-emitting diode), has characteristics such as energy-saving and environmental protection, efficient, safety, therefore, be widely used in illumination occasions such as view, street lamp and electronic product backlight.
Generally, led drive circuit all is to adopt the 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, led driver 1 is converted to direct current with electric main (operating frequency is 50Hz) and offers the LED load, and concrete, led driver 1 is with electric main V
InBehind over commutation, be converted to direct current again and offer the LED load.But, because the drive current that led driver is exported to the LED load includes the alternating current component about 100Hz, thereby the stroboscopic phenomenon that human eye can perceive can appear when causing LED luminous.
See also Fig. 1 b, show the groundwork oscillogram in the circuit shown in Fig. 1 a, the power factor of supposing led driver 1 is 1, electric main V
InDuring for sine wave, the input current i of led driver then
InBe sine wave, instantaneous input power P
InBe the pulsating power of sinusoidal quadratic form, and power output P
oBe straight power, the voltage at LED load two ends can be thought straight voltage, flows through the current i of LED load
LEDIn contain alternating current component about 100Hz, cause occurring the stroboscopic phenomenon that human eye can perceive, therefore, be badly in need of a kind of circuit that can eliminate the 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 led drive circuit of the LED of elimination stroboscopic, and to realize eliminating the stroboscopic phenomenon in the LED load, technical scheme is as follows:
The application provides a kind of circuit of the LED of elimination stroboscopic, be applied in the 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, is used for the alternating voltage ripple of the output voltage of the described led drive circuit of filtering;
The first power end of described controllable devices and the second power end are connected between described output capacitance and the LED load, do not contain alternating current component and constant DC driven electric current provide for described LED load.
Preferably, described filter circuit comprises resistance and filter capacitor, one end of described resistance connects an end of described output capacitance, and the other end of described resistance connects an 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 an 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 the described LED load.
The application also provides a kind of method of the LED of elimination stroboscopic, is applied to comprise in the circuit of above-mentioned elimination LED stroboscopic:
The controllable devices that utilization has constant-current characteristics does not contain alternating current component and constant DC driven electric current for described LED load provides;
By the alternating voltage ripple in the output voltage of the described led drive circuit of filter circuit filtering.
Preferably, when described controllable devices was metal-oxide-semiconductor, the controllable devices that described utilization has a constant-current characteristics was specially for described LED load provides the process that does not contain alternating current component and constant DC driven electric current:
Control described metal-oxide-semiconductor and work in the constant current district, and it is constant to control the grid-source voltage of described metal-oxide-semiconductor, keep constant so that flow through the electric current of the drain-source utmost point of 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 the led drive circuit, because the characteristic of the load that led driver connects has certain influence to the voltage and current of led driver output, obtain by experiment, when the load that connects when led driver has current source characteristic, the electric current that flows through described load does not contain alternating current component substantially, but the output voltage of led driver contains a spot of alternating current component, therefore, the present invention produces the DC driven LED loaded work piece that does not contain alternating current component by the circuit of described elimination LED stroboscopic, and utilize alternating current component in the output voltage of filter circuit filtering led drive circuit, thereby eliminate the alternating current in the LED load, voltage ripple is finally eliminated the stroboscopic phenomenon of LED load.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, the accompanying drawing that describes below only is some embodiment that put down in writing among the application, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 a is the structural representation of traditional led drive circuit;
Fig. 1 b is the groundwork waveform schematic diagram in the circuit shown in Fig. 1 a;
Fig. 2 a is the equivalent structure schematic diagram of LED load;
Fig. 2 b is that the load of led drive circuit is the theory diagram of LED load;
Fig. 2 c is that the load of led drive circuit is the theory diagram of voltage source;
Fig. 2 d is that the load of led drive circuit is the theory diagram of current source;
The structural representation of the circuit of a kind of LED of elimination 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;
The method flow schematic diagram of a kind of LED of elimination 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 the led drive circuit, on the basis of existing led drive circuit, its output is improved, thereby eliminates the LED stroboscopic phenomenon.
Concrete, shown in Fig. 2 a, LED load to simplify the analysis is resistance R with the LED equivalence
LEDAnd have a constant pressure drop (VF
LED) diode series connection, at this moment, the output current ripple i of led drive circuit
RippleComputing formula as follows:
In the following formula, R
LEDBe the resistance R in the LED equivalent structure
LEDResistance, C
OutBe the output capacitance C in the led drive circuit
OutThe appearance value.
The characteristic of the load that led drive circuit connects is not simultaneously, the voltage ripple of its output and current ripples are also with different, specifically the output voltage with led drive circuit is that 40V, output current are that 400mA is that example is analyzed, specifically referring to the circuit diagram shown in Fig. 2 b-Fig. 2 d, Fig. 2 b is that the load of led drive circuit is the theory diagram of LED load, Fig. 2 c is that the load of led drive circuit is the theory diagram of voltage source, and Fig. 2 d is that the load of led drive circuit is the theory diagram of current source.
Shown in Fig. 2 b, when load is the LED load, because the LED load has constant-voltage characteristic, then the voltage at LED load two ends can be thought straight voltage, but the electric current that flows through the LED load is the pulsating current that contains the alternating current component about 100Hz, according to formula 1 as can be known, its current ripples is very big, and the result of calculation of concrete output ripple content is: voltage ripple v
Ripple=7%, current ripples i
Ripple=45.1%.
Shown in Fig. 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 pulsing, and output current is the pulsating current that contains the alternating current component about 100Hz, and current ripples is very big, and the result of calculation of concrete output ripple content is: voltage ripple v
Ripple=0%, current ripples i
Ripple=200%.
Shown in Fig. 2 d, when load was current source, because current source has constant-current characteristics, so the output current of led drive circuit is the straight electric current of not pulsing, and the output voltage pulsation was very little, and the result of calculation of concrete output ripple content is: voltage ripple v
Ripple=7.2%, current ripples i
Ripple=0%.
By above-mentioned experiment analysis results as can be known, core concept of the present invention is: if output loading in parallel can equivalence be regarded the output loading with current source characteristic as after led driver and the output capacitance, then in theory, the output current ripple of led drive circuit can be reduced to zero, can eliminate the pulsating current of the alternating current component about the 100Hz that comprises in the output current of led drive circuit this moment fully, thereby eliminate the LED stroboscopic phenomenon, but, this moment, the output voltage of led drive circuit had less pulsation, therefore need reduce the ripple content of the output voltage of led drive circuit, make its output voltage for not containing the straight voltage of ripple.
In order to make those skilled in the art person understand technical scheme among the application better, 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 only is the application's part embodiment, rather than whole embodiment.Based on the embodiment among the application, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all should belong to the scope of the application's protection.
See also Fig. 3, show the structural representation of the circuit of a kind of LED of elimination 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
OutBe parallel between two outputs of described led driver 1 output capacitance C
OutAn 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 realize output capacitance C by electrochemical capacitor
OutPositive ends connect the cathode output end of led driver, output capacitance C
OutThe negative 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:
Preferably, filter circuit 100 can be made of resistance and filter capacitor, can change the time constant of filter circuit by the value of regulating resistance or filter capacitor, and then alternating current component that can the filtering different frequency.
During concrete enforcement, filter circuit 100 comprises resistance R and the filter capacitor C that is connected in series, and wherein, an end of resistance R is connected to output capacitance C
OutAn end that is connected with the cathode output end of led driver, the other end of resistance R connects the end of filter capacitor C, and the other end of filter capacitor C is connected to output capacitance C
OutAn end that is connected with the cathode output end of led driver.
In order to make the alternating current component about the 100Hz that filter circuit 100 comprises in can the output voltage of filtering led drive circuit, timeconstant can be arranged in the scope that is not less than 10ms, τ=RC wherein, R is the resistance of the resistance R in the filter circuit 100, C is the appearance value of filter capacitor C.Usually timeconstant is set to 100ms, and at this moment, the low-limit frequency that filter circuit 100 can the filtering AC ripple is 10Hz, is straight voltage thereby make the voltage at LED load two ends.
The first power end and the second power end of controllable devices 200 are connected on output capacitance C
OutAnd between the LED load, think that the LED load provides and do not contain alternating current component and constant DC driven electric current.
Preferably, controllable devices 200 can be metal-oxide-semiconductor M, concrete can be for N-MOS manages, or P-MOS pipe, the first power end of controllable devices 200, the second power end, control end are respectively drain electrode, source electrode, the grid of N-MOS pipe or P-MOS pipe;
Concrete, the drain electrode of N-MOS pipe or P-MOS pipe is connected to described output capacitance C
OutWith the end that the cathode output end of led driver 1 is connected, 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.
Because the cut-in voltage V of metal-oxide-semiconductor M
THBe constant, when it is in the constant current district, if the voltage V of its grid-source electrode
GSConstant, then flow through the electric current I of the drain-source utmost point
DSInvariable.Because metal-oxide-semiconductor has above-mentioned characteristic, therefore, only need the control metal-oxide-semiconductor to be operated in the constant current district, and make V
GSInvariable, then metal-oxide-semiconductor has constant-current characteristics, makes that the LED load current is the direct current that does not contain alternating current component.
If will eliminate the stroboscopic phenomenon of LED load, must make metal-oxide-semiconductor be operated in the constant current district, then require the voltage ripple of output capacitance to meet the following conditions:
Wherein, V
Cout,
RippleBe output capacitance C
OutThe ripple value, V
THCut-in voltage for metal-oxide-semiconductor M.
The operation principle of the circuit of the stroboscopic of the elimination LED that present embodiment provides is as follows:
Metal-oxide-semiconductor is in conducting state always, and be connected the LED load output capacitance C this moment with led drive circuit
OutThe voltage at two ends comprises the alternating current component about 100Hz, and the alternating voltage ripple about filter circuit 100 filtering 100Hz makes that the voltage at LED load two ends is straight voltage, and has following relational expression:
V
c=V
LED+ V
GS(formula 3)
Wherein, V
cBe the voltage on the filter capacitor C, V
LEDBe the voltage at LED load two ends, V
GSVoltage for metal-oxide-semiconductor grid-source electrode.
Because 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 as can be known, V
GSSubstantially constant.
When metal-oxide-semiconductor is operated in the constant current district, if V
GSConstant, the Dui Ying electric current I that flows through the drain-source utmost point then
DSAlso constant, the electric current that namely flows through the LED load does not comprise the alternating current component about 100Hz, also be the pulsating current that the circuit of the elimination LED stroboscopic that provides of present embodiment can be eliminated the alternating current component about 100Hz in the output current of led drive circuit, thereby eliminate 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.
See also Fig. 4, described led drive circuit comprises led driver 1 and output capacitance C
Out, and the circuit 10 of the elimination LED stroboscopic that provides of above-described embodiment.
The input of led driver 1 connects electric main V
In, output is parallel with output capacitance C
Out, the circuit 10 of eliminating the LED stroboscopic is connected between described led driver 1 and the LED load electric main V
InChange direct current into through led driver and offer the LED load, but the output current of led driver 1 is the current ripples that contains alternating current component, AC ripple in the output current of the circuit 10 elimination led drivers 1 of process elimination LED stroboscopic, thereby eliminate the AC ripple that flows through LED, and then the stroboscopic phenomenon of elimination LED, simultaneously, the AC ripple in the output voltage of the circuit 10 elimination led drivers 1 of utilization elimination LED stroboscopic makes that the voltage at LED two ends is straight voltage.
The led drive circuit that present embodiment provides can be eliminated the alternating current component in the electric current that flows through LED, thereby eliminates the LED stroboscopic phenomenon.
Corresponding to the circuit of above-mentioned elimination LED stroboscopic, the application also provides a kind of method of the LED of elimination stroboscopic, and as shown in Figure 5, this method is applied to may further comprise the steps in the circuit of above-mentioned elimination LED stroboscopic:
101, utilizing the controllable devices with constant-current characteristics is that the LED load provides and do not contain alternating current component and constant DC driven electric current;
During concrete enforcement, described controllable devices can realize by metal-oxide-semiconductor, because the cut-in voltage V of metal-oxide-semiconductor
THBe constant, when it is in the constant current district, if the voltage V between its grid-source electrode
GSConstant, then flow through the electric current I of the drain-source utmost point
DSInvariable, at this moment, metal-oxide-semiconductor has constant-current characteristics, and metal-oxide-semiconductor makes and flows through the LED load current for not containing the direct current of alternating current component with after the LED load is connected.
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, changes the frequency of alternating current component that can filtering by the numerical value of regulating resistance, filter capacitor.
Need to prove that above-mentioned step 101 and step 102 can be carried out simultaneously, can also be first execution in step 102, and execution in step 101 again.
The method of the elimination LED stroboscopic that present embodiment provides by LED load and the controllable devices with constant-current characteristics are connected to eliminate the alternating current ripple that flows through the LED load, thereby is eliminated the stroboscopic phenomenon of LED.
The above only is the application's embodiment; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the application's principle; can also make some improvements and modifications, these improvements and modifications also should be considered as the application's protection range.
Claims (7)
1. circuit of eliminating the LED stroboscopic, be applied in the 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, is used for the alternating voltage ripple of the output voltage of the described led drive circuit of filtering;
The first power end of described controllable devices and the second power end are connected between described output capacitance and the LED load, do not contain alternating current component and constant DC driven electric current provide for described LED load.
2. the circuit of elimination according to claim 1 LED stroboscopic, it is characterized in that, described filter circuit comprises resistance and filter capacitor, one end of described resistance connects an end of described output capacitance, the other end of described resistance connects an end of described filter capacitor, and the other end of described filter capacitor connects the other end of described output capacitance.
3. the circuit of elimination according to claim 2 LED stroboscopic, it is characterized in that, described controllable devices is metal-oxide-semiconductor, the first power end of described metal-oxide-semiconductor connects an end of described output capacitance, 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.
4. the circuit of elimination LED stroboscopic according to claim 1 is characterized in that the time constant of described filter circuit is not less than 10ms.
5. a led drive circuit comprises led driver, output capacitance, it is characterized in that, also comprises the circuit of each described elimination LED stroboscopic of claim 1-4;
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 the described LED load.
6. a method of eliminating the LED stroboscopic is applied to it is characterized in that in each described circuit of claim 1-4, comprising:
The controllable devices that utilization has constant-current characteristics does not contain alternating current component and constant DC driven electric current for described LED load provides;
By the alternating voltage ripple in the output voltage of the described led drive circuit of filter circuit filtering.
7. the method for elimination according to claim 6 LED stroboscopic, it is characterized in that, when described controllable devices was metal-oxide-semiconductor, the controllable devices that described utilization has a constant-current characteristics was specially for described LED load provides the process that does not contain alternating current component and constant DC driven electric current:
Control described metal-oxide-semiconductor and work in the constant current district, and it is constant to control the grid-source voltage of described metal-oxide-semiconductor, keep constant so that flow through the electric current of the drain-source utmost point of described metal-oxide-semiconductor.
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| CN103840647A (en) * | 2014-03-18 | 2014-06-04 | 矽力杰半导体技术(杭州)有限公司 | Current filter circuit and power supply converter |
| US9615415B2 (en) | 2014-09-01 | 2017-04-04 | Silergy Semiconductor Technology (Hangzhou) Ltd. | LED driving circuit and method using single inductor |
| US9648677B2 (en) | 2014-09-01 | 2017-05-09 | Silergy Semiconductor Technology (Hangzhou) Ltd. | LED driving circuit and method using single inductor |
| CN106941752A (en) * | 2017-05-05 | 2017-07-11 | 矽力杰半导体技术(杭州)有限公司 | Ripple suppression circuit and led driver |
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| CN103281838B (en) | 2015-11-25 |
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