CN105848357A - LED drive circuit capable of resisting electromagnetic interference - Google Patents
LED drive circuit capable of resisting electromagnetic interference Download PDFInfo
- Publication number
- CN105848357A CN105848357A CN201610338281.0A CN201610338281A CN105848357A CN 105848357 A CN105848357 A CN 105848357A CN 201610338281 A CN201610338281 A CN 201610338281A CN 105848357 A CN105848357 A CN 105848357A
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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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The invention relates to an LED drive circuit capable of resisting electromagnetic interference. The LED drive circuit comprises a rectifier module, an EMC anti-interference module and a constant current module. The EMC anti-interference module comprises a common mode filter submodule and a differential mode filter submodule. The input end of the common mode filter submodule is connected with AC commercial power; the output end of the common mode filter submodule is connected with the input end of the rectifier module; the output end of the rectifier module is connected with the input end of the differential mode filter submodule; the output end of the differential mode filter submodule is connected with the input end of the constant current module; and the output end of the constant current module is connected with an LED module. In the LED drive circuit, electromagnetic interference is eliminated by the EMC anti-interference module to ensure the LED module can work normally and stably.
Description
Technical field
The invention belongs to technical field of LED illumination, be specifically related to the LED drive circuit of a kind of electromagnetism interference.
Background technology
Development along with science and technology, the comfortableness of life is required more and more higher by people, diversified high-power electric appliance and Smart Home continue to bring out in modern house as household electrical appliances, and people have been not only limited to switch to the control of household electrical appliances, but remotely control by controlling home electronics server.Water heater such as domestic is controlled by mobile phone, very easy to use.But controlling these white goods when, electromagnetic interference can be produced, thus affect the normal work that family's LED illumination device drives, it is therefore desirable to a kind of the LED drive circuit of electromagnetism interference can guarantee the normal work of LED illumination device.
Summary of the invention
It is an object of the invention to provide the LED drive circuit of a kind of electromagnetism interference, eliminate, by the EMC immunity module arranged in circuit, the impact that LED illumination is driven by electromagnetic interference produced by white goods, it is ensured that LED illumination device normally works.
To achieve these goals, the technical solution used in the present invention is, a kind of LED drive circuit of electromagnetism interference, including rectification module, EMC immunity module and constant flow module, described EMC immunity module includes common mode filtering submodule and differential mode filtering submodule, the input incoming transport civil power of described common mode filtering submodule, the outfan of common mode filtering submodule connects the input of rectification module, the outfan of rectification module connects the input of differential mode filtering submodule, and the outfan of differential mode filtering submodule connects the input of constant flow module；The outfan of constant flow module connects LED module.
As a modification of the present invention, described constant flow module includes constant current submodule, spike eliminates submodule, output separaant module and output filtering submodule, the input of described constant current submodule connects the outfan of differential mode filtering submodule, described spike eliminates the outfan of the input connection differential mode filtering submodule of submodule, the input of described output separaant module connects spike and eliminates submodule and the outfan of constant current submodule, the outfan of output separaant module connects the input of output filtering submodule, the outfan of output filtering submodule connects LED module.
As a modification of the present invention, described LED drive circuit also includes overload protection module, and the input of described overload protection module connects live wire and the zero line of electric main, and the outfan of described overload protection module connects the input of common mode filtering submodule.
As a modification of the present invention, described common mode filtering submodule includes common mode inductance, oneth X electric capacity and the 2nd X electric capacity, described differential mode filtering submodule includes differential mode inductance, first resistance and the first electric capacity, described rectification module uses rectifier bridge to realize, described common mode inductance includes first coil and the second coil, oneth X capacitance series is between first end and the first end of the second coil of first coil, 2nd X capacitance series is between second end and the second end of the second coil of first coil, and second coil first end connect rectifier bridge first exchange end, second end of the second coil connects the second exchange end of rectifier bridge；First exchange end and the input of the second exchange end composition rectifier bridge, the outfan of rectifier bridge includes positive voltage output end and negative voltage outfan, one end of described differential mode inductance connects the positive voltage output end of rectifier bridge, the other end is connected serially to one end of the first electric capacity, the other end ground connection of the first electric capacity, described first resistor coupled in parallel is connected to the two ends of differential mode inductance.
As a modification of the present invention, described overload protection module includes electric fuse and varistor, and one end of described electric fuse connects the live wire of electric main, the first end of other end concatenation to varistor, and the second end of varistor connects the zero line of electric main；A described X electric capacity is connected in parallel between the first end of varistor and the second end.
Relative to prior art, the present invention eliminates, by arranging rectification module, EMC immunity module and constant flow module, the electromagnetic interference influence that LED illumination device is produced by white goods, wherein, electric main filters interference signal therein by common mode filtering submodule, by rectifier bridge, glitch-free electric main rectification being processed as unidirectional current again, unidirectional current eliminates the produced interference of rectification by differential mode filtering submodule further simultaneously；After eliminating the unidirectional current of interference and carrying out PFC and voltage increase and current constant process by constant flow module, it is suitable for the driving voltage of LED module work by output separaant module isolation and amplifier.Additionally, due to have employed spike elimination submodule to completely eliminate ripple current when isolation and amplifier with output filtering submodule, also eliminate the stroboscopic phenomenon of LED module.
Accompanying drawing explanation
Fig. 1 is the schematic block circuit diagram of the present invention.
Fig. 2 is the circuit theory diagrams of the embodiment of the present invention.
Detailed description of the invention
In order to deepen the understanding of the present invention and understanding, the invention will be further described and introduces for below in conjunction with the accompanying drawings with one embodiment.
As it is shown in figure 1, the LED drive circuit of a kind of electromagnetism interference, can be connected with LED module, the illumination light-emitting equipment that described LED module can be combined by multiple LED.Described LED drive circuit includes rectification module, EMC immunity module and constant flow module, described EMC immunity module includes common mode filtering submodule and differential mode filtering submodule, the input incoming transport civil power of described common mode filtering submodule, the outfan of common mode filtering submodule connects the input of rectification module, the outfan of rectification module connects the input of differential mode filtering submodule, and the outfan of differential mode filtering submodule connects the input of constant flow module；The outfan of constant flow module connects LED module.
Specifically, described constant flow module includes that constant current submodule, spike eliminate submodule, output separaant module and output filtering submodule, the input of described constant current submodule connects the outfan of differential mode filtering submodule, described spike eliminates the outfan of the input connection differential mode filtering submodule of submodule, the input of described output separaant module connects spike and eliminates submodule and the outfan of constant current submodule, the outfan of output separaant module connects the input of output filtering submodule, and the outfan of output filtering submodule connects LED module.
It addition, this LED drive circuit also includes overload protection module, the input of described overload protection module connects live wire and the zero line of electric main, and the outfan of described overload protection module connects the input of common mode filtering submodule.
As shown in Figure 2, give one concrete can the LED drive circuit embodiment of electromagnetism interference, in the present embodiment, described common mode filtering submodule includes common mode inductance L1, an X electric capacity CX1 and the 2nd X electric capacity CX2, described differential mode filtering submodule includes differential mode inductance L2, the first resistance R1 and the first electric capacity C1, and described rectification module uses rectifier bridge BD1 to realize.Described common mode inductance L1 includes first coil and the second coil, oneth X electric capacity CX1 is serially connected between the first end of first coil and the first end of the second coil, 2nd X electric capacity CX2 is serially connected between the second end of first coil and the second end of the second coil, and second coil first end connect rectifier bridge BD1 first exchange end, the second coil second end connect rectifier bridge BD1 second exchange end.First exchange end and the input of the second exchange end composition rectifier bridge BD1, the outfan of rectifier bridge BD1 includes positive voltage output end and negative voltage outfan.One end of described differential mode inductance L2 connects the positive voltage output end of rectifier bridge BD1, and the other end is connected serially to one end of the first electric capacity C1, the other end ground connection of the first electric capacity C1, and described first resistance R1 is connected in the two ends of differential mode inductance L2 in parallel.The EMC immunity module being made up of described common mode filtering submodule and differential mode filtering submodule can allow the current signal of predeterminated frequency to enter LED module, and high frequency disturbs current signal have bigger inhibition.
Described overload protection module includes that one end of electric fuse F1 and varistor ZR1, described electric fuse F1 connects the live wire of electric main, the first end of other end concatenation to varistor ZR1, and second end of varistor ZR1 connects the zero line of electric main.A described X electric capacity CX1 is connected in parallel between first end of varistor ZR1 and the second end.Under normal circumstances, varistor ZR1 is high-impedance state, can present short-circuit condition after exceeding its threshold value, and then between N/L, electric fuse F1 is burnt in short circuit, to play the effect protecting the most each submodular circuits.
Described output separaant module uses three winding isolating transformer T1, described three winding isolating transformer T1 includes the first armature winding, the second armature winding and secondary windings, described first armature winding connects described spike and eliminates the outfan of submodule, second armature winding connects the outfan of constant current submodule, the Same Name of Ends of described secondary windings connects input one end of output filtering submodule, and non-same polarity connects the other end of output filtering submodule input.
nullDescribed constant current submodule includes BP3319M constant current chip U1、Second resistance R2、3rd resistance R3、4th resistance R4、5th resistance R5、8th resistance R8、9th resistance R9、Tenth resistance R10、11st resistance R11、12nd resistance R12、13rd resistance R13、First diode D1、3rd diode D3、MOS switch pipe Q1、3rd electric capacity C3 and the first filter capacitor CE1，One end of described second resistance R2 connects the GATE pin of BP3319M constant current chip U1，The other end connects the grid of MOS switch pipe Q1，One end of the 3rd resistance R3 is connected between the second resistance R2 and MOS switch pipe Q1 grid，The other end connects the CS pin of BP3319M constant current chip U1，That end of 4th resistance R4 is connected between differential mode inductance L2 and the first electric capacity C1 after the 4th resistance R4 and the 5th resistance R5 concatenation and is connected by that end of the 5th resistance R5 the VCC pin of BP3319M constant current chip U1，One end of 8th resistance R8 connects the VCC pin of BP3319M constant current chip U1，The other end connects the negative pole of the 3rd diode D3，One end of 9th resistance R9 connects the positive pole of the 3rd diode D3，The other end connects the VCC pin of BP3319M constant current chip U1，Tenth to the 12nd resistance R12 be in parallel after one end connect MOS switch pipe Q1 source electrode，Other end ground connection，One end of 13rd resistance R13 connects the FB pin of BP3319M constant current chip U1，Other end ground connection；One end of 3rd electric capacity C3 connects the COM pin of BP3319M constant current chip U1, other end ground connection, first diode D1 and the second resistance R2 is connected in parallel, the positive pole of the second diode D2 connects the drain electrode of MOS switch pipe Q1, the drain electrode of MOS switch pipe Q1 connects the Same Name of Ends of first armature winding of three winding isolating transformer T1, one end of 9th resistance R9 connects the Same Name of Ends of second armature winding of three winding isolating transformer T1, is connected and has the first filter capacitor CE1 between the VCC pin and ground of BP3319M constant current chip U1.MOS switch pipe Q1 is for controlling output frequency in constant current submodule, described ten, the 11 and 12 resistance constitute current sample end, the 9th resistance R9 and the 13rd resistance R13 is current-limiting resistance, plays the effect of overvoltage protection.
Described spike eliminates submodule and includes the 6th resistance R6, the 7th resistance R7, the 4th electric capacity C4 and the second diode D2, that end of 6th resistance R6 is connected between differential mode inductance L2 and the first electric capacity C1 and is connected by that end of the 7th resistance R7 after the 6th resistance R6 and the 7th resistance R7 concatenation the negative pole of the second diode D2, and the 4th electric capacity C4 and the 6th resistance R6 is connected in parallel.
nullDescribed output filtering submodule includes the 14th resistance R14、15th resistance R15、5th electric capacity C5、4th diode D4、Second filter capacitor CE2、3rd filter capacitor CE3 and the 4th inductance L4，Described 14th resistance R14 and the 5th electric capacity C5 is connected in parallel with the 4th diode D4 after first concatenating，The positive pole of the 4th diode D4 connects the Same Name of Ends of the secondary windings of three winding isolating transformer T1，The negative pole of the 4th diode D4 is serially connected with the second filter capacitor CE2 and the 3rd filter capacitor CE3，Second filter capacitor CE2 and the 3rd filter capacitor CE3 is connected in parallel，It is connected in parallel the 15th resistance R15 at the two ends of the second filter capacitor CE2，At the two ends of the 3rd filter capacitor CE3 and meet the 4th inductance L4，Described 4th inductance L4 and LED module is connected.Described second filter capacitor CE2 and the 3rd filter capacitor CE3 can eliminate the interference signal in output voltage further.
Technological means disclosed in the present invention program is not limited only to the technological means disclosed in above-mentioned embodiment, also includes the technical scheme being made up of above technical characteristic combination in any.It should be pointed out that, for those skilled in the art, under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.In the claims, word first, second and third use do not indicate that any order, can be title by these word explanations.
Claims (6)
1. the LED drive circuit of an electromagnetism interference, it is characterized in that: include rectification module, EMC immunity module and constant flow module, described EMC immunity module includes common mode filtering submodule and differential mode filtering submodule, the input incoming transport civil power of described common mode filtering submodule, the outfan of common mode filtering submodule connects the input of rectification module, the outfan of rectification module connects the input of differential mode filtering submodule, and the outfan of differential mode filtering submodule connects the input of constant flow module；The outfan of constant flow module connects LED module.
The LED drive circuit of a kind of electromagnetism interference the most as claimed in claim 1; it is characterized in that; described LED drive circuit also includes overload protection module; the input of described overload protection module connects live wire and the zero line of electric main, and the outfan of described overload protection module connects the input of common mode filtering submodule.
The LED drive circuit of a kind of electromagnetism interference the most as claimed in claim 1 or 2, it is characterized in that, described constant flow module includes constant current submodule, spike eliminates submodule, output separaant module and output filtering submodule, the input of described constant current submodule connects the outfan of differential mode filtering submodule, described spike eliminates the outfan of the input connection differential mode filtering submodule of submodule, the input of described output separaant module connects spike and eliminates submodule and the outfan of constant current submodule, the outfan of output separaant module connects the input of output filtering submodule, the outfan of output filtering submodule connects LED module.
The LED drive circuit of a kind of electromagnetism interference the most as claimed in claim 1 or 2, it is characterized in that, described common mode filtering submodule includes common mode inductance, oneth X electric capacity and the 2nd X electric capacity, described differential mode filtering submodule includes differential mode inductance, first resistance and the first electric capacity, described rectification module uses rectifier bridge to realize, described common mode inductance includes first coil and the second coil, oneth X capacitance series is between first end and the first end of the second coil of first coil, 2nd X capacitance series is between second end and the second end of the second coil of first coil, and second coil first end connect rectifier bridge first exchange end, second end of the second coil connects the second exchange end of rectifier bridge；First exchange end and the input of the second exchange end composition rectifier bridge, the outfan of rectifier bridge includes positive voltage output end and negative voltage outfan, one end of described differential mode inductance connects the positive voltage output end of rectifier bridge, the other end is connected serially to one end of the first electric capacity, the other end ground connection of the first electric capacity, described first resistor coupled in parallel is connected to the two ends of differential mode inductance.
The LED drive circuit of a kind of electromagnetism interference the most as claimed in claim 2; it is characterized in that; described overload protection module includes electric fuse and varistor; one end of described electric fuse connects the live wire of electric main; the other end concatenates the first end to varistor, and the second end of varistor connects the zero line of electric main；A described X electric capacity is connected in parallel between the first end of varistor and the second end.
The LED drive circuit of a kind of electromagnetism interference the most as claimed in claim 3, it is characterized in that, described output separaant module uses three winding isolating transformer, described three winding isolating transformer includes the first armature winding, the second armature winding and secondary windings, described first armature winding connects described spike and eliminates the outfan of submodule, second armature winding connects the outfan of constant current submodule, the Same Name of Ends of described secondary windings connects input one end of output filtering submodule, and non-same polarity connects the other end of output filtering submodule input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610338281.0A CN105848357A (en) | 2016-05-19 | 2016-05-19 | LED drive circuit capable of resisting electromagnetic interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610338281.0A CN105848357A (en) | 2016-05-19 | 2016-05-19 | LED drive circuit capable of resisting electromagnetic interference |
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| CN105848357A true CN105848357A (en) | 2016-08-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610338281.0A Pending CN105848357A (en) | 2016-05-19 | 2016-05-19 | LED drive circuit capable of resisting electromagnetic interference |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107425741A (en) * | 2017-07-18 | 2017-12-01 | 浙江凯耀照明股份有限公司 | A kind of ac-dc converter circuit with low-voltage variation |
| CN110519888A (en) * | 2019-09-03 | 2019-11-29 | 深圳市纳泽光电有限公司 | A kind of LED drive circuit |
| CN112616223A (en) * | 2020-12-31 | 2021-04-06 | 珠海雷特科技股份有限公司 | Silicon controlled rectifier dimming power supply and filter circuit thereof |
-
2016
- 2016-05-19 CN CN201610338281.0A patent/CN105848357A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107425741A (en) * | 2017-07-18 | 2017-12-01 | 浙江凯耀照明股份有限公司 | A kind of ac-dc converter circuit with low-voltage variation |
| CN107425741B (en) * | 2017-07-18 | 2020-06-26 | 浙江凯耀照明股份有限公司 | AC-DC conversion circuit with low-voltage protection |
| CN110519888A (en) * | 2019-09-03 | 2019-11-29 | 深圳市纳泽光电有限公司 | A kind of LED drive circuit |
| CN112616223A (en) * | 2020-12-31 | 2021-04-06 | 珠海雷特科技股份有限公司 | Silicon controlled rectifier dimming power supply and filter circuit thereof |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160810 |
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| WD01 | Invention patent application deemed withdrawn after publication |