CN104486870A - Driving circuit and driving device of non-flicker LED (light emitting diode) lamp - Google Patents
Driving circuit and driving device of non-flicker LED (light emitting diode) lamp Download PDFInfo
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- CN104486870A CN104486870A CN201410689939.3A CN201410689939A CN104486870A CN 104486870 A CN104486870 A CN 104486870A CN 201410689939 A CN201410689939 A CN 201410689939A CN 104486870 A CN104486870 A CN 104486870A
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Abstract
The invention is applicable for the technical field of LED (light emitting diode) illumination, and provides a driving circuit and a driving device of a non-flicker LED lamp. The circuit comprises a mono-pole PFC (power factor correction) constant-voltage power supply, a constant current sampling and amplifying circuit, a voltage regulating circuit and a ripple suppression circuit, wherein the mono-pole PFC constant-voltage power supply, the constant current sampling and amplifying circuit, the voltage regulating circuit and the current ripple suppression circuit are electrically connected sequentially, and the voltage regulating circuit is used for reducing the output voltage to be lower than a first predetermined voltage value, the ripple suppression circuit is used for reducing the ripple voltage output by the LED driving power supply to be a second predetermined voltage value. The driving circuit and driving device provided by the invention can be matched with the LED constant-voltage driving power supply of a single PFC structure, have a high-efficiency LED linear constant current power supply with voltage regulation at the same time, not only is the power consumption of the power MOS (metal oxide semiconductor) controlled to reach high efficiency, but also the inherent low-frequency ripple of a mono-pole PFC constant-voltage power supply is suppressed, thereby the flicker is lower than 1%.
Description
Technical field
The invention belongs to technical field of LED illumination, particularly relate to a kind of drive circuit without stroboscopic LED lamp and drive unit.
Background technology
LED illumination has that efficiency is high, the life-span is long and the advantage such as environmental protection, and be regarded as most potential lighting source of future generation, LED illumination market obtains swift and violent development in recent years.Wherein single-stage PFC topological structure, because its power factor is high, cost is low, volume is little and obtain a wide range of applications in field of LED illumination.The low-frequency ripple intrinsic due to single-stage PFC topological structure is high, and single-stage PFC ripple, up to 3-10V, causes it to there is certain defect in use: 1. the electric power output voltage ripple of single-stage PFC is too large, and stroboscopic is serious, has a great impact the eyesight of people; 2. the power supply ripple of single-stage PFC is too large, and stroboscopic is serious, and therefore the camera application of occasion as news media such as TV stations of the low stroboscopic of ask for something is restricted.
At present, ripple roughly two kinds is reduced:
The first scheme is, single-stage PFC constant pressure source adds DC-DC converter, and EMI and cost all can get on, but due to the VF consistency of LED can not be fine, discreteness is comparatively large, and the situation lower linear constant current pressure drop on the low side at load LEDVF is high, loss is large.
First scheme is, single-stage PFC constant pressure source adds common linear constant current, can get well relative to the EMI of DC-DC, cost also can be low, but because the VF consistency of LED can not be fine, discreteness is comparatively large, and the situation lower linear constant current pressure drop on the low side at load LEDVF is high, loss is large.
To apply maximum 10-50WLED power supplys, it is mostly single-stage PFC power supply, it is low that this topological structure can improve power factor cost, wherein power factor is more than 0.95, simple circuit, quite to favor by client, but because the intrinsic low-frequency ripple of single-stage PFC topological structure is large, the serious problem of stroboscopic still can not solve.
Summary of the invention
Embodiments provide a kind of drive circuit without stroboscopic LED lamp and drive unit, be intended to solve prior art due to the intrinsic low-frequency ripple of single-stage PFC topological structure large, the problem that stroboscopic is serious.
On the one hand, a kind of drive circuit without stroboscopic LED lamp is provided, described circuit comprises: single-stage PFC constant voltage source, Constant flow sample amplifying circuit, voltage-regulating circuit and ripple suppression circuit, wherein, described single-stage PFC constant voltage source, described Constant flow sample amplifying circuit, described voltage-regulating circuit and described current ripple inhibition circuit are electrically connected in turn, described voltage-regulating circuit is used for output voltage to reduce below the first preset voltage value, and the ripple voltage that described ripple suppression circuit is used for LED drive power exports is down to the second preset voltage value.
Further, described first preset voltage value is 1.2V.
Further, described second preset voltage value is not more than 1V.
Further, described Constant flow sample amplifying circuit comprises the first amplifier; First power MOS pipe; First, second, third and fourth divider resistance; First and second current sampling resistor, wherein, 5th pin of the first amplifier by after first, second, third and fourth divider resistance dividing potential drop for Constant flow sample amplifying circuit provides reference voltage, the first current sampling resistor that the source electrode of the first power MOS pipe connects over the ground, described first current sampling resistor connects described second current sampling resistor.
Further, described voltage-regulating circuit comprises the second amplifier; First photoelectrical coupler; First, second and third dividing potential drop voltage-stabiliser tube; Five, six, seven divider resistances, wherein, voltage by the 6th, after seven divider resistances for 3 pin of described second amplifier provide reference voltage, first, second and third dividing potential drop voltage-stabiliser tube described and the 5th divider resistance are connected into voltage sampling circuit, the voltage signal of the sampling of electric power output voltage is fed back to 2 pin of described second amplifier by described voltage sampling circuit, and compare amplification with the reference voltage of 3 pin of described second amplifier, 1 foot control system first photoelectrical coupler of described second amplifier.
Further, described first power MOS pipe is connected on the output loop of described single-stage PFC constant voltage source.
Further, 6 pin of described first amplifier are Constant flow sample end, and the S pole of the first power MOS pipe connects reverse input end 6 pin of the first amplifier by first and second current sampling resistor described; Output 1 pin of described second amplifier is connected with the K pin of the first photoelectrical coupler by the 8th divider resistance.
Further, 2 pin of described second amplifier are Constant flow sample end, and the S pole of the first power MOS pipe connects reverse input end 2 pin of the first amplifier by first and second current sampling resistor described; Output 7 pin of described first amplifier is connected with the K pin of the first photoelectrical coupler by the 8th divider resistance.
Further, described ripple suppression circuit comprises the second amplifier, the first feedback resistance, the first feedback capacity and the first photoelectrical coupler and formed, voltage is after dividing potential drop, for 5 pin of the second amplifier provide required reference voltage, according to the S pole of described first power MOS pipe sampling ripple voltage, be fed to 6 pin inverting inputs of the second amplifier, and the reference voltage of 5 pin of the second amplifier compares amplification through voltage sample, remove driving first photoelectrical coupler, ripple voltage is suppressed.
On the other hand, provide a kind of drive unit without stroboscopic LED lamp, the described drive unit without stroboscopic LED lamp comprises the drive circuit without stroboscopic LED lamp described in preceding claim.
In the embodiment of the present invention, comprise single-stage PFC constant voltage source, Constant flow sample amplifying circuit, voltage-regulating circuit and ripple suppression circuit, wherein, described single-stage PFC constant voltage source, described Constant flow sample amplifying circuit, described voltage-regulating circuit and described current ripple inhibition circuit are electrically connected in turn, described voltage-regulating circuit is used for output voltage to reduce below the first preset voltage value, the ripple voltage that described ripple suppression circuit is used for LED drive power exports is down to the second preset voltage value, the present invention, there is the LED constant-voltage driving power source matching capacity with single-stage PFC framework, two kinds of power supplys play respective advantage and organically combine together, simultaneously, there is the high efficiency LED linear constant-current supply of voltage follow, the power consumption of MOS can be controlled, make its efficiency high, the low-frequency ripple that single-stage PFC constant pressure source is intrinsic can be suppressed again, make stroboscopic lower than 1%.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the drive circuit without stroboscopic LED lamp that the embodiment of the present invention one provides;
Fig. 2 is the concrete connection layout of the drive circuit without stroboscopic LED lamp that the embodiment of the present invention one provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Below in conjunction with specific embodiment, realization of the present invention is described in detail:
Embodiment one
Fig. 1 shows the schematic diagram of the drive circuit without stroboscopic LED lamp that the embodiment of the present invention one provides, this drive circuit without stroboscopic LED lamp comprises single-stage PFC constant voltage source 11, Constant flow sample amplifying circuit 12, voltage-regulating circuit 13 and ripple suppression circuit 14, wherein, described single-stage PFC constant voltage source 11, described Constant flow sample amplifying circuit 12, described voltage-regulating circuit 13 is electrically connected in turn with described current ripple inhibition circuit 14, described voltage-regulating circuit 13 is for reducing below the first preset voltage value by output voltage, described ripple suppression circuit 14 is down to the second preset voltage value for ripple voltage LED drive power exported.Because single-stage PFC constant voltage source 11 is prior art, therefore, do not repeating herein.
Further, described first preset voltage value is 1.2V.
Further, described second preset voltage value is not more than 1V.Preferably, described second preset voltage value equals 500 millivolts.
Further, described Constant flow sample amplifying circuit 12 comprises the first amplifier; First power MOS pipe; First, second, third and fourth divider resistance; First and second current sampling resistor, wherein, 5th pin of the first amplifier by after first, second, third and fourth divider resistance dividing potential drop for Constant flow sample amplifying circuit provides reference voltage, the first current sampling resistor that the source electrode of the first power MOS pipe connects over the ground, described first current sampling resistor connects described second current sampling resistor.
In the present embodiment, as shown in Figure 2, described Constant flow sample amplifying circuit comprises amplifier U3B, power MOS pipe Q5, divider resistance R31, R32, R33, R34 and current sampling resistor R22, R23, wherein provided the VCC voltage of 2.5V reference voltage and 10V by TL431, amplifier U3 controls power MOS pipe constant current; 6 pin of amplifier U3B by after R31, R32, R33, R34 dividing potential drop for Constant flow sample amplifying circuit provides reference voltage, this reference voltage can adjust according to power parameter; The R22 that the source electrode of power MOS pipe Q5 connects over the ground; Current sample voltage supply to 6 pin of amplifier U3B, and after 5 pin of amplifier U3B compare amplification, completes constant current output by the grid of the 7 foot control metal-oxide-semiconductor Q5 of amplifier U3B.
Further, described voltage-regulating circuit 13 comprises the second amplifier; First photoelectrical coupler; First, second and third dividing potential drop voltage-stabiliser tube; Five, six, seven divider resistances, wherein, voltage by the 6th, after seven divider resistances for 3 pin of described second amplifier provide reference voltage, first, second and third dividing potential drop voltage-stabiliser tube described and the 5th divider resistance are connected into voltage sampling circuit, the voltage signal of the sampling of electric power output voltage is fed back to 2 pin of described second amplifier by described voltage sampling circuit, and compare amplification with the reference voltage of 3 pin of described second amplifier, 1 foot control system first photoelectrical coupler of described second amplifier.
In the present embodiment, as shown in Figure 2, described voltage-regulating circuit comprises amplifier U3A and photoelectrical coupler U2A, described voltage-stabiliser tube ZD5, ZD4 and ZD2, resistance R19, R20, R21 and described power MOS pipe; Accurate a reference source TL431 provides the VCC voltage of 2.5V voltage and 10V, the VCC voltage of 10V by after described divider resistance R20 and R21 for 3 pin of described amplifier U3A provide reference voltage; Described voltage-stabiliser tube ZD5, ZD4 and ZD2, R19 is connected into voltage sampling circuit, the voltage signal of the sampling of electric power output voltage is fed back to 2 pin of described amplifier U3A by described voltage sampling circuit, and compare amplification with the reference voltage of 3 pin of described amplifier U3A, the 1 foot control photoelectrical coupler U2A of amplifier U3A; 1 pin through amplifier U3A drives photoelectrical coupler U2A, thus the voltage between the DS (drain electrode and source electrode) that control power MOS pipe Q5, make the voltage between its DS (drain electrode and source electrode) be less than 1.2V, achieve low-power consumption, high efficiency; The model of photoelectrical coupler U2A is PC817B.
Further, described first power MOS pipe is connected on the output loop of described single-stage PFC constant voltage source.As shown in Figure 2, power MOS pipe Q2 is connected in single-stage PFC constant pressure source output loop.
Further, 6 pin of described first amplifier are Constant flow sample end, and the S pole of the first power MOS pipe connects reverse input end 6 pin of the first amplifier by first and second current sampling resistor described; Output 1 pin of described second amplifier is connected with the K pin of the first photoelectrical coupler by the 8th divider resistance.As shown in Figure 2,6 pin of described amplifier U3B are Constant flow sample end; The S pole of described power MOS pipe Q5 is connected amplifier U3B reverse input end 6 pin by described R23 with described R22; Output 1 pin of described amplifier U3A is connected with the K pin of photoelectrical coupler by R16.
Further, 2 pin of described second amplifier are Constant flow sample end, and the S pole of the first power MOS pipe connects reverse input end 2 pin of the first amplifier by first and second current sampling resistor described; Output 7 pin of described first amplifier is connected with the K pin of the first photoelectrical coupler by the 8th divider resistance.
Further, described ripple suppression circuit 14 comprises the second amplifier, the first feedback resistance, the first feedback capacity and the first photoelectrical coupler and formed, voltage is after dividing potential drop, for 5 pin of the second amplifier provide required reference voltage, according to the S pole of described first power MOS pipe sampling ripple voltage, be fed to 6 pin inverting inputs of the second amplifier, and the reference voltage of 5 pin of the second amplifier compares amplification through voltage sample, remove driving first photoelectrical coupler, ripple voltage is suppressed.As shown in Figure 2, described current ripple inhibition circuit is for the size of the power consumption and output circuit ripple that control metal-oxide-semiconductor, and by double operational amplifier U3A, voltage sample resistance R22, R23, and feedback resistance R17, feedback capacity C11, photoelectrical coupler U2A formed.Accurate a reference source TL431 provides the VCC voltage of 2.5V benchmark and 10V, again through R31, for 5 pin of LM358 amplifier U3B provide required reference voltage after R32, R33, R34 dividing potential drop, voltage sample resistance R22, from the S pole sampling ripple voltage of power MOS pipe Q5, be fed to the 6 pin inverting inputs of double operational amplifier U3B, and the reference voltage of 5 pin of amplifier U3B compares amplification, go to drive photoelectrical coupler U2A, it is very low that ripple voltage suppresses by double operational amplifier.Ripple voltage is suppressed to hundreds of millivolt from a few volt.
The present embodiment, there is the LED constant-voltage driving power source matching capacity with single-stage PFC framework, two kinds of power supplys play respective advantage and organically combine together, simultaneously, there is the high efficiency LED linear constant-current supply of voltage follow, the power consumption of MOS can be controlled, make its efficiency high, the low-frequency ripple that single-stage PFC constant pressure source is intrinsic can be suppressed again, make stroboscopic lower than 1%.
Embodiment two
The concrete structure block diagram of the drive unit that the embodiment of the present invention two provides, the drive unit that the embodiment of the present invention provides includes the circuit embodiments one of aforementioned correspondence, and details, see the description of above-described embodiment one, do not repeat them here.
It should be noted that in said system embodiment, included unit is carry out dividing according to function logic, but is not limited to above-mentioned division, as long as can realize corresponding function; In addition, the concrete title of each functional unit, also just for the ease of mutual differentiation, is not limited to protection scope of the present invention.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the drive circuit without stroboscopic LED lamp, it is characterized in that, described circuit comprises: single-stage PFC constant voltage source, Constant flow sample amplifying circuit, voltage-regulating circuit and ripple suppression circuit, wherein, described single-stage PFC constant voltage source, described Constant flow sample amplifying circuit, described voltage-regulating circuit and described current ripple inhibition circuit are electrically connected in turn, described voltage-regulating circuit is used for output voltage to reduce below the first preset voltage value, and the ripple voltage that described ripple suppression circuit is used for LED drive power exports is down to the second preset voltage value.
2., as claimed in claim 1 without the drive circuit of stroboscopic LED lamp, it is characterized in that, described first preset voltage value is 1.2V.
3., as claimed in claim 1 without the drive circuit of stroboscopic LED lamp, it is characterized in that, described second preset voltage value is not more than 1V.
4., as claimed in claim 1 without the drive circuit of stroboscopic LED lamp, it is characterized in that, described Constant flow sample amplifying circuit comprises the first amplifier; First power MOS pipe; First, second, third and fourth divider resistance; First and second current sampling resistor, wherein, 5th pin of the first amplifier by after first, second, third and fourth divider resistance dividing potential drop for Constant flow sample amplifying circuit provides reference voltage, the first current sampling resistor that the source electrode of the first power MOS pipe connects over the ground, described first current sampling resistor connects described second current sampling resistor.
5., as claimed in claim 4 without the drive circuit of stroboscopic LED lamp, it is characterized in that, described voltage-regulating circuit comprises the second amplifier; First photoelectrical coupler; First, second and third dividing potential drop voltage-stabiliser tube; Five, six, seven divider resistances, wherein, voltage by the 6th, after seven divider resistances for 3 pin of described second amplifier provide reference voltage, first, second and third dividing potential drop voltage-stabiliser tube described and the 5th divider resistance are connected into voltage sampling circuit, the voltage signal of the sampling of electric power output voltage is fed back to 2 pin of described second amplifier by described voltage sampling circuit, and compare amplification with the reference voltage of 3 pin of described second amplifier, 1 foot control system first photoelectrical coupler of described second amplifier.
6., as claimed in claim 4 without the drive circuit of stroboscopic LED lamp, it is characterized in that, described first power MOS pipe is connected on the output loop of described single-stage PFC constant voltage source.
7. as claimed in claim 6 without the drive circuit of stroboscopic LED lamp, it is characterized in that, 6 pin of described first amplifier are Constant flow sample end, and the S pole of the first power MOS pipe connects reverse input end 6 pin of the first amplifier by first and second current sampling resistor described; Output 1 pin of described second amplifier is connected with the K pin of the first photoelectrical coupler by the 8th divider resistance.
8. as claimed in claim 6 without the drive circuit of stroboscopic LED lamp, it is characterized in that, 2 pin of described second amplifier are Constant flow sample end, and the S pole of the first power MOS pipe connects reverse input end 2 pin of the first amplifier by first and second current sampling resistor described; Output 7 pin of described first amplifier is connected with the K pin of the first photoelectrical coupler by the 8th divider resistance.
9. as claimed in claim 1 without the drive circuit of stroboscopic LED lamp, it is characterized in that, described ripple suppression circuit comprises the second amplifier, first feedback resistance, first feedback capacity and the first photoelectrical coupler formed, voltage is after dividing potential drop, for 5 pin of the second amplifier provide required reference voltage, through voltage sample and according to the S pole of described first power MOS pipe sampling ripple voltage, be fed to 6 pin inverting inputs of the second amplifier, amplification is compared with the reference voltage of 5 pin of the second amplifier, remove driving first photoelectrical coupler, ripple voltage is suppressed.
10. without a drive unit for stroboscopic LED lamp, it is characterized in that, the described drive unit without stroboscopic LED lamp comprises the drive circuit without stroboscopic LED lamp described in any one of claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410689939.3A CN104486870A (en) | 2014-11-25 | 2014-11-25 | Driving circuit and driving device of non-flicker LED (light emitting diode) lamp |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410689939.3A CN104486870A (en) | 2014-11-25 | 2014-11-25 | Driving circuit and driving device of non-flicker LED (light emitting diode) lamp |
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| CN104486870A true CN104486870A (en) | 2015-04-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410689939.3A Pending CN104486870A (en) | 2014-11-25 | 2014-11-25 | Driving circuit and driving device of non-flicker LED (light emitting diode) lamp |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106413204A (en) * | 2016-11-29 | 2017-02-15 | 东莞市达恩照明有限公司 | Ripple absorption circuit |
| CN106961762A (en) * | 2017-02-27 | 2017-07-18 | 南昌大学 | A kind of method that the special light fixture of the full spectrum of the low blue light of no stroboscopic is made up of incandescent lamp |
| CN111669863A (en) * | 2020-06-22 | 2020-09-15 | 欧普照明股份有限公司 | LED drive circuit |
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| CN103096557A (en) * | 2011-10-29 | 2013-05-08 | 重庆四联光电科技有限公司 | Light-emitted diode (LED) driving power |
| CN103945608A (en) * | 2014-04-15 | 2014-07-23 | 广东科谷电源有限公司 | Low power consumed LED linear power supply with following characteristic |
| CN204291461U (en) * | 2014-11-25 | 2015-04-22 | 深圳市润杰明成照明科技有限公司 | A kind of drive circuit without stroboscopic LED lamp and drive unit |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20080129225A1 (en) * | 2004-12-03 | 2008-06-05 | Isao Yamamoto | Power Supply Device, Light Emitting Device Using Such Power Supply Device, And Electronic Device |
| CN103096557A (en) * | 2011-10-29 | 2013-05-08 | 重庆四联光电科技有限公司 | Light-emitted diode (LED) driving power |
| CN103945608A (en) * | 2014-04-15 | 2014-07-23 | 广东科谷电源有限公司 | Low power consumed LED linear power supply with following characteristic |
| CN204291461U (en) * | 2014-11-25 | 2015-04-22 | 深圳市润杰明成照明科技有限公司 | A kind of drive circuit without stroboscopic LED lamp and drive unit |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106413204A (en) * | 2016-11-29 | 2017-02-15 | 东莞市达恩照明有限公司 | Ripple absorption circuit |
| CN106961762A (en) * | 2017-02-27 | 2017-07-18 | 南昌大学 | A kind of method that the special light fixture of the full spectrum of the low blue light of no stroboscopic is made up of incandescent lamp |
| CN106961762B (en) * | 2017-02-27 | 2019-02-01 | 南昌大学 | A method of being made of the special lamps and lanterns of the full spectrum of the low blue light of no stroboscopic incandescent lamp |
| CN111669863A (en) * | 2020-06-22 | 2020-09-15 | 欧普照明股份有限公司 | LED drive circuit |
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