CN103200727A - Light-emitting diode (LED) driving circuit and lighting device comprising same - Google Patents
Light-emitting diode (LED) driving circuit and lighting device comprising same Download PDFInfo
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- CN103200727A CN103200727A CN2012100035656A CN201210003565A CN103200727A CN 103200727 A CN103200727 A CN 103200727A CN 2012100035656 A CN2012100035656 A CN 2012100035656A CN 201210003565 A CN201210003565 A CN 201210003565A CN 103200727 A CN103200727 A CN 103200727A
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- circuit
- power factor
- led
- factor correction
- feedback
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/38—Switched mode power supply [SMPS] using boost topology
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention provides a light-emitting diode (LED) driving circuit and a lighting device comprising the same. The LED driving circuit comprises a power factor correcting circuit, one or more LED loads, a feedback circuit and a power factor correction controller, wherein the power factor correcting circuit is configured to correct power factors of the circuit; the feedback circuit is configured to supply a feedback signal which is related to the one or more LED loads to the power factor correction controller; and the power factor correction controller is configured to control the power factor correcting circuit based on the feedback signal supplied by the feedback circuit to maintain constant output of the power factor correcting circuit. According to the technical scheme, a factor value with high power can be achieved through a simple circuit structure and low cost, driving to the LED lighting device is achieved at the same time, and stable lighting intensity can be obtained.
Description
Technical field
The lighting device that the present invention relates to a kind of led drive circuit and comprise this led drive circuit, particularly, relate to a kind of can be with simple circuit configuration and low-cost high power factor (PF) value and the led drive circuit of stabilized illumination intensity and the lighting device that comprises this led drive circuit of obtaining.
Background technology
In recent years, light-emitting diode (LED) has luminous efficiency height, life-span length, high brightness, energy-saving and environmental protection owing to it and characteristics such as sturdy and durable are widely used in the lighting device.But because the use of traditional Switching Power Supply led drive circuit has been injected increasing harmonic wave to electric power system, cause the harmonic pollution in the electrical network serious day by day, thereby have influence on the fail safe of grid supply quality and user's use.Active Power Factor Correction (APFC) technology is to improve the power factor of electronic product, reduce electric network pollution and reduce the effective ways of humorous wave interference.Therefore, in the today of advocating " green electrical network " and " green illumination ", Active Power Factor Correction Technology has become the focus of research.
In the prior art field, APFC commonly used comprises booster type (Boost), voltage-dropping type (Buck), buck-boost type (Buck-Boost), normal shock type (Forward) and flyback (Flyback) circuit of power factor correction.In the LED lighting field, existing led driver implementation normally is made of APFC and special driving circuit, this existing technical scheme realizes more complex and expensive, and may have the problem of light flash.
Summary of the invention
Provided hereinafter about brief overview of the present invention, in order to basic comprehension about some aspect of the present invention is provided.But, should be appreciated that this general introduction is not about exhaustive general introduction of the present invention.It is not that intention is used for determining key part of the present invention or pith, neither be intended to limit scope of the present invention.Its purpose only is that the form of simplifying provides about some concept of the present invention, with this as the preorder in greater detail that provides after a while.
Therefore, in view of said circumstances, the purpose of this invention is to provide a kind of led drive circuit that can when realizing power factor correction, keep stabilized illumination intensity.This led drive circuit can improve the power factor value of circuit, and does not need special driving circuit or circuit of power factor correction are set separately, and is simpler thereby circuit is realized, greatly reduces cost.In addition, in this led drive circuit, increase the monitoring to load output, thereby can correspondingly adjust circuit of power factor correction according to the load output state, made circuit output keep constant, eliminate the flicker of LED light-emitting device, improved the comfortableness that the user uses.
According to embodiments of the invention, a kind of led drive circuit is provided, it comprises: circuit of power factor correction is configured to the power factor of circuit is proofreaied and correct; One or more LED loads; Feedback circuit is configured to the feedback signal about one or more LED loads is provided to power factor correction controller; And power factor correction controller, the feedback signal that provides based on feedback circuit is provided, the control circuit of power factor correction, constant with the output of holding power factor correcting circuit.
According to a preferred embodiment of the invention, feedback circuit can comprise: signal detection module is configured to detect the signal about one or more LED loads; And signal conversion module, be configured to detected signal is converted to feedback signal.
According to a preferred embodiment of the invention, circuit of power factor correction can be boost power factor correction circuit.
According to a preferred embodiment of the invention, one or more LED load can be connected in series between the input and output of circuit of power factor correction.
According to a preferred embodiment of the invention, one or more LED load can be connected in series between the output and ground of circuit of power factor correction.
According to a preferred embodiment of the invention, feedback circuit can also comprise: resistor, be connected between one or more LED loads and the signal conversion module, and being used for the electric energy from one or more LED loads is the signal conversion module power supply.
According to another embodiment of the present invention, also provide a kind of lighting device, it comprises aforesaid led drive circuit.
Description of drawings
The present invention can by with reference to hereinafter by reference to the accompanying drawings given detailed description be better understood, wherein in institute's drawings attached, used same or analogous Reference numeral to represent identical or similar parts.Described accompanying drawing comprises in this manual and forms the part of specification together with following detailed description, is used for further illustrating the preferred embodiments of the present invention and explains principle and advantage of the present invention.
Fig. 1 illustrates the block diagram of the functional configuration of led drive circuit according to an embodiment of the invention;
Fig. 2 is the block diagram that the functional configuration of the feedback circuit among Fig. 1 is shown; And
Fig. 3 illustrates the circuit diagram of the specific implementation of led drive circuit according to an embodiment of the invention.
Embodiment
To be described one exemplary embodiment of the present invention by reference to the accompanying drawings hereinafter.For clarity and conciseness, all features of actual execution mode are not described in specification.Yet, should understand, in the process of any this practical embodiments of exploitation, must make a lot of decisions specific to execution mode, in order to realize developer's objectives, for example, meet and system and professional those relevant restrictive conditions, and these restrictive conditions may change to some extent along with the difference of execution mode.In addition, might be very complicated and time-consuming though will also be appreciated that development, concerning the those skilled in the art that have benefited from present disclosure, this development only is routine task.
At this, what also need to illustrate a bit is, for fear of having blured the present invention because of unnecessary details, only show in the accompanying drawings with according to the closely-related apparatus structure of the solution of the present invention and/or treatment step, and omitted other details little with relation of the present invention.
1-3 describes the preferred embodiments of the present invention hereinafter with reference to accompanying drawing.
At first, with reference to Fig. 1 the functional block diagram of led drive circuit is according to an embodiment of the invention described.As shown in Figure 1, led drive circuit can comprise circuit of power factor correction 101, one or more LED load 102, feedback circuit 103 and power factor correction controller 104.
Particularly, circuit of power factor correction 101 can be configured to the power factor of circuit is proofreaied and correct.Circuit of power factor correction 101 can be known boost power factor correction circuit in the prior art field, but the present invention is not limited to this, those skilled in the art can select dissimilar circuit of power factor correction according to actual needs, for example voltage-dropping type, buck-boost type, normal shock type or flyback circuit of power factor correction, and correspondingly change connection and direction between each circuit block according to principle of the present invention, thereby realize corresponding technique effect.
Preferably, one or more LED loads 102 can be connected in series between the input and output of circuit of power factor correction, perhaps also can be connected between the output and earth potential of circuit of power factor correction.Wherein, the connected mode of LED load 102 depends on the type of circuit of power factor correction, for example, under the situation of boost power factor correction circuit, because the output voltage of circuit of power factor correction is higher than input voltage, therefore, the anode tap of LED load is connected to the output of circuit of power factor correction, and cathode terminal is connected to the input of circuit of power factor correction.
The feedback signal that provides based on feedback circuit 103 can be provided power factor correction controller 104, control circuit of power factor correction 101, output with holding power factor correcting circuit 101 is constant, thereby make that LED load 102 can be luminous with constant brightness, eliminate phenomenons such as flicker, improved the comfortableness that the user uses.
Describe the functional configuration of feedback circuit 103 in detail hereinafter with reference to Fig. 2.
As shown in Figure 2, feedback circuit 103 can comprise signal detection module 201 and signal conversion module 202.
Particularly, signal detection module 201 can be configured to detect the signal about one or more LED loads.This signal can be the curtage signal about load output.
Preferably, feedback circuit 103 can also comprise resistor 203, and this resistor can be connected between one or more LED loads and the signal conversion module 202, and the electric energy from load output since being used for is signal conversion module 202 power supplies.This design simplification the power supply of signal conversion module, and realize simpler, thereby further reduced cost.
Next, describe the concrete exemplary realization of led drive circuit according to a preferred embodiment of the invention in detail with reference to Fig. 3.It is pointed out that it only is exemplary that following circuit is realized, for a person skilled in the art, according to design of the present utility model and theory, can easily make various modifications, variation and modification according to actual conditions to following exemplary realization.
Shown in the dashed rectangle among Fig. 3, inductor L1, diode D1 and switch element Q1 have constituted boost power factor correction circuit U4.This boost power factor correction circuit U4 is circuit structure well known in the art, no longer is described in greater detail at this.Wherein, switch element Q1 can be metal oxide semiconductor field effect tube (MOSFET), igbt (IGBT), bipolar junction transistor (BJT) etc., does not limit at this.Preferably, boost power factor correction circuit U4 is elevated to for example 400V (this voltage is the typical output voltage values that is used for the circuit of power factor correction of LED driving) with DC input voitage.In addition, compare with the circuit of power factor correction of other type, boost power factor correction circuit has regulates the simple and PF value advantage of higher of driving simple, switch element.
One or more LED loads are connected in series between the input and output of circuit of power factor correction, as shown in Figure 3, namely are connected between input point 1 and the output point 2.In the preferred embodiment, because circuit of power factor correction is booster type, so the voltage at output point 2 places is higher than the voltage at input point 1 place, so the anode tap of LED is connected to output point 2, and cathode terminal is connected to input point 1.Owing to always have pressure drop between output point 2 and the input point 1, therefore realize the driving to the LED load easily, just can not realize driving to the LED load thereby do not need to arrange extra drive circuit, and realize the correction to power factor simultaneously, thereby simplify circuit structure.In addition, this connection of LED load configuration has also realized the clamp to the voltage between the input of circuit of power factor correction and the output (namely put 1 and put 2), thereby is conducive to stablize the voltage at output point 2 places.
As an alternative, one or more LED loads also can be connected between the output point 2 and ground of circuit of power factor correction.
In the preferred embodiment, feedback circuit can be made of signal detection module U3, signal conversion module U1 and resistor R2.
Particularly, can detect the output current of LED load by resistor R1, and this current signal is offered signal detection module U3.As example, signal detection module U3 can be realized by LMV431.Because R1 is the current sampling resistor as load output, therefore adopts LMV431 can realize constant current, thus make to the detection of load output more accurate.
Should be understood that herein LMV431 only be the exemplary realization of signal detection module and unrestricted, those skilled in the art also can alternatively adopt other electronic device, as long as it can realize the detection to load signal.
Signal conversion module U1 can realize that here it is converted to corresponding feedback signal with the detected load output current signal of LMV431, and the feedback signal after will changing is provided to power factor correction controller U2 by optocoupler.
Should be understood that herein and realize that by optocoupler signal conversion module only is exemplary, those skilled in the art also can adopt other electronic device, as long as it can realize function switching signal.
In addition, in this embodiment, as shown in Figure 3, resistor R2 is connected between the point 8 and optocoupler between a plurality of LED loads, electric energy from load output since it is the optocoupler power supply, thereby has simplified the supply power mode of optocoupler, and it is more simple to make circuit realize.
Power factor correction controller U2 can be according to conducting or the shutoff of the feedback signal control switch element Q1 that receives, thereby regulate the voltage of output point 2, make it be stabilized in for example 400V, and then can obtain the constant luminous intensity of LED, eliminated the scintillation of LED.
According to above embodiment, this led drive circuit is integrated in power factor correction and LED driving function in the circuit, thereby can with simple circuit configuration and lower cost when realizing higher PF value realization to the driving of LED light-emitting device, and control switch element conducting or the shutoff of circuit of power factor correction by the signal about load condition that power factor correction controller provides based on feedback circuit, output with the holding power factor correcting circuit is constant, thereby eliminated the scintillation of light-emitting device, improved user's experience.
Although the above specific implementation of having described led drive circuit according to a preferred embodiment of the invention in conjunction with Fig. 3, it should be understood that, circuit structure shown in Figure 3 and employed electronic unit only are exemplary and unrestricted, the principle that those skilled in the art can instruct according to the present invention and according to actual needs above circuit structure is carried out various modification, replacement etc.
In addition, should also be noted that above-mentioned series function and device also can be by software and/or firmware realizations.Under situation about realizing by software and/or firmware, to the computer with specialized hardware structure the program that constitutes this software is installed from storage medium or network, this computer can be carried out various functions when various program is installed.
It will be understood by those skilled in the art that under the situation that does not deviate from scope of the present invention except specifically described, the present invention can change and revise here.Significantly all this variations and modification should be regarded as falling in the spirit and scope of the present invention to those skilled in the art.Should be understood that and the present invention includes all such variation and modifications.The present invention also comprise individually or jointly quote in the specification or point out in steps with feature and described step or feature any two or more arbitrarily and all combinations.
Claims (7)
1. led drive circuit comprises:
Circuit of power factor correction is configured to the power factor of circuit is proofreaied and correct;
One or more LED loads;
Feedback circuit is configured to the feedback signal about described one or more LED loads is provided to power factor correction controller; And
The feedback signal that provides based on described feedback circuit is provided power factor correction controller, controls described circuit of power factor correction, and is constant with the output of keeping described circuit of power factor correction.
2. led drive circuit according to claim 1, wherein, described feedback circuit comprises:
Signal detection module is configured to detect the signal about described one or more LED loads; And
Signal conversion module is configured to detected signal is converted to described feedback signal.
3. led drive circuit according to claim 1, wherein, described circuit of power factor correction is boost power factor correction circuit.
4. led drive circuit according to claim 1, wherein, described one or more LED loads are connected in series between the input and output of described circuit of power factor correction.
5. led drive circuit according to claim 1, wherein, described one or more LED loads are connected in series between the output and ground of described circuit of power factor correction.
6. led drive circuit according to claim 2, wherein, described feedback circuit also comprises:
Resistor is connected between described one or more LED load and the described signal conversion module, and being used for the electric energy from described one or more LED loads is described signal conversion module power supply.
7. a lighting device comprises as each described led drive circuit among the claim 1-6.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100035656A CN103200727A (en) | 2012-01-06 | 2012-01-06 | Light-emitting diode (LED) driving circuit and lighting device comprising same |
| PCT/EP2012/075746 WO2013102548A1 (en) | 2012-01-06 | 2012-12-17 | Led driving circuit and illumination device including the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100035656A CN103200727A (en) | 2012-01-06 | 2012-01-06 | Light-emitting diode (LED) driving circuit and lighting device comprising same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103200727A true CN103200727A (en) | 2013-07-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100035656A Pending CN103200727A (en) | 2012-01-06 | 2012-01-06 | Light-emitting diode (LED) driving circuit and lighting device comprising same |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN103200727A (en) |
| WO (1) | WO2013102548A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106464126A (en) * | 2014-03-14 | 2017-02-22 | 金斯顿女王大学 | Primary side controlled led driver with ripple cancellation |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007080771A (en) * | 2005-09-16 | 2007-03-29 | Nec Lighting Ltd | Low voltage power supply circuit for lighting, lighting device, and method of outputting power of low voltage power supply for lighting |
| US7528551B2 (en) * | 2007-02-26 | 2009-05-05 | Semiconductor Components Industries, L.L.C. | LED control system |
| US7804256B2 (en) * | 2007-03-12 | 2010-09-28 | Cirrus Logic, Inc. | Power control system for current regulated light sources |
| WO2010027817A2 (en) * | 2008-08-25 | 2010-03-11 | Maxim Integrated Products, Inc. | Power factor correction in and dimming of solid state lighting devices |
| CN101686587B (en) * | 2008-09-25 | 2015-01-28 | 皇家飞利浦电子股份有限公司 | Drive for providing variable power for LED array |
| EP2341760A1 (en) * | 2009-12-23 | 2011-07-06 | Tridonic AG | Circuit for operating light emitting diodes (LEDs) |
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2012
- 2012-01-06 CN CN2012100035656A patent/CN103200727A/en active Pending
- 2012-12-17 WO PCT/EP2012/075746 patent/WO2013102548A1/en active Application Filing
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106464126A (en) * | 2014-03-14 | 2017-02-22 | 金斯顿女王大学 | Primary side controlled led driver with ripple cancellation |
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| WO2013102548A1 (en) | 2013-07-11 |
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Application publication date: 20130710 |