CN201409247Y - Driving circuit of LED (Light-Emitting Diode) lamp - Google Patents
Driving circuit of LED (Light-Emitting Diode) lamp Download PDFInfo
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- CN201409247Y CN201409247Y CN2009201202927U CN200920120292U CN201409247Y CN 201409247 Y CN201409247 Y CN 201409247Y CN 2009201202927 U CN2009201202927 U CN 2009201202927U CN 200920120292 U CN200920120292 U CN 200920120292U CN 201409247 Y CN201409247 Y CN 201409247Y
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Abstract
The utility model relates to a driving circuit of an LED (Light-Emitting Diode) lamp. The driving circuit comprises an alternating-current rectifier and filter circuit (1) and an LED lamp driving circuit (2), wherein, the alternating-current rectifier and filter circuit (1) of which the input terminal is connected with a commercial power is used for transforming an alternating current to a directcurrent; the driving circuit is characterized in that the LED lamp driving circuit comprises a switch power controller (U1), a second inductor (L2), a diode (D1) and a fourth capacitor (C4), wherein,the output terminal of the alternating-current rectifier and filter circuit is connected with the first terminal of the second inductor (L2); the second terminal of the second inductor (L2) is connected with a drain pin (DRAIN) of the switch power controller (U1); the positive electrode of the diode (D1) is also connected with the drain pin (DRAIN) of the switch power controller (U1); the negativeelectrode of the diode (D1) is connected with the positive electrode of the fourth capacitor (C4); the negative electrode of the fourth capacitor (C4) is connected with the first terminal of the second inductor (L2); the first terminal of the second inductor (L2) is connected with a negative electrode power supply terminal loading the LED lamp; and the negative electrode of the diode (D1) is connected with a positive electrode power supply terminal loading the LED lamp.
Description
Technical field
The utility model relates to a kind of drive circuit of LED lamp.
Background technology
LED is called energy-conservation illuminating product always, compares with incandescent lamp and fluorescent lamp, and it is little that LED has a volume, can many multiple combinations, caloric value is low, does not have thermal radiation basically, and power consumption is little, can low-voltage, the low current starting, long service life, the operating time can reach more than 30,000 hours.Reaction speed is fast, can be at high-frequency operation, and environmental protection, shatter-proof, shock-resistantly be difficult for brokenly, recyclable as discarded object, and do not pollute.But the planar package easy exploiting becomes advantages such as compact product.A good LED illuminating product must have a led drive circuit that reliability is high, and good led drive circuit not only requires efficiently, good reliability, long-life, but also must possess common voltage characteristic preferably.
Publication number is that (application number is: Chinese patent 200810080042.5) provides a kind of LED lighting drive circuit to CN101431846, it comprises bridge rectifier and filter circuit, the duty cycle adjustment circuit, high-frequency isolation transformer, output rectification and filter circuit, feedback control circuit and photoelectrical coupler are formed, the input of bridge rectifier and filter circuit links to each other with civil power, output inserts the duty cycle adjustment circuit, the duty cycle adjustment circuit connects high-frequency isolation transformer and photoelectrical coupler respectively, the input of output rectification and filter circuit inserts the output of high-frequency isolation transformer, output is connected with feedback control circuit, feedback control circuit links to each other with the duty cycle adjustment circuit by photoelectronic coupler, and its output inserts the feeder ear of LED load.The LED lighting driving circuit structure complexity of this structure, and do not consider the Electro Magnetic Compatibility of light fixture.If when selecting the drive circuit of said structure to drive, have serious current harmonics, will cause bigger harmonic wave harm to electrical network when installing in enormous quantities than high-power LED lamp.
The utility model content
Technical problem to be solved in the utility model be at above-mentioned prior art provide that a kind of circuit structure is simple, Electric Circuit Electromagnetic Compatibility is good, the drive circuit of LED lamp that can fine inhibition current harmonics when driving than high-powered LED lamp.
The utility model solves the problems of the technologies described above the technical scheme that is adopted: the drive circuit of this LED lamp comprises
The AC rectification filter circuit, the input of AC rectification filter circuit links to each other with civil power, is used for converting alternating current to direct current;
The LED lamp drive circuit, the input of LED lamp drive circuit links to each other with the output of AC rectification filter circuit, and the output of LED lamp drive circuit connects the feeder ear of load LED lamp, and it is luminous to be used to drive load LED lamp;
It is characterized in that: described LED lamp drive circuit includes a switch power controller, second inductance, one diode, the 4th electric capacity, wherein the output of AC rectification filter circuit links to each other with first end of second inductance, second end of second inductance links to each other with the drain lead of switch power controller, the positive pole of diode also links to each other with the drain lead of switch power controller, the negative pole of diode links to each other with the positive pole of the 4th electric capacity, the negative pole of the 4th electric capacity links to each other with first end of second inductance, and first end of second inductance connects the negative pole feeder ear of load LED lamp, and the negative pole of diode connects the anodal feeder ear of load LED lamp.
Preferably, also include the power supply constant-current control circuit, this power supply constant-current control circuit includes first resistance, second resistance, the 3rd resistance, photoelectrical coupler, voltage stabilizing didoe, wherein first end of second inductance connects first end of the 3rd resistance, and second end of the 3rd resistance links to each other with the negative pole of LED lamp again; The negative pole of diode links to each other with the negative pole of voltage stabilizing didoe, the positive pole of voltage stabilizing didoe links to each other with first end of first resistance, second end of first resistance links to each other with first end of second resistance, second end of second resistance links to each other with second end of the 3rd resistance, the positive pole of photoelectrical coupler photophore links to each other with second end of first resistance, the negative pole of photoelectrical coupler photophore links to each other with first end of the 3rd resistance, the input of photoelectrical coupler light-receiving device links to each other the output head grounding of photoelectrical coupler light-receiving device with the feedback input pin of switch power controller.
Compared with prior art, advantage of the present utility model is:
1, the energy of the utility model supply load LED lamp passes to load LED lamp when the second inductance inverse electromotive force, and the Electro Magnetic Compatibility of drive circuit can well solve;
2, be that a kind of non-isolation type drives, the energy conversion efficiency height, particularly advantage is very obvious when being lower than the 40W use, is suitable for very much the LED light fixture of casing insulation;
3, circuit structure is simple, and cost is low, the reliability height;
4, when driving, cooperate the fine inhibition current harmonics of power factor correction chip energy, make whole lamp power factor, significantly reduce reactive power, effectively reduce the instantaneous load of electrical network greater than 0.9 than high-powered LED lamp.
Description of drawings
Fig. 1 is the circuit theory diagrams of the utility model embodiment.
Embodiment
Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.
The drive circuit of LED lamp as shown in Figure 1 comprises AC rectification filter circuit 1, LED lamp drive circuit 2, power supply constant-current control circuit 3.
Wherein the input of AC rectification filter circuit 1 links to each other with civil power, be used for converting alternating current to direct current, AC rectification filter circuit 1 can adopt conventional current rectifying and wave filtering circuit, in the present embodiment, AC rectification filter circuit 1 is by electric current fuse F1, bridge heap DB1, first capacitor C 1, first inductance L 1, the π type filter circuit that second capacitor C 2 is formed, the zero line of civil power inserts two inputs that bridge is piled DB1 with live wire after connecting electric current fuse F1, the cathode output end of bridge heap DB1 is connected with the positive pole of first capacitor C 1, the negative pole of bridge heap DB1 goes out end and is connected with the negative pole of first capacitor C 1, the positive pole of bridge heap DB1 goes out end and is connected with first end of first inductance L 1, second end of first inductance L 1 and 2 anodal connections of second capacitor C, the equal ground connection of cathode output end of second capacitor C, 2 negative poles and bridge heap DB1; Second end of first inductance L 1 is the output of AC rectification filter circuit 1, the output dc high-voltage.
The π type structure that AC rectification filter circuit 1 adopts not only can provide more level and smooth high direct voltage for the back level, and can in low-power circuit, play the effect that suppresses Conducted Electromagnetic Interference, make the conducted interference of putting in order lamp satisfy the related request of international standard EN55015:2006;
The input of LED lamp drive circuit 2 links to each other with the output of AC rectification filter circuit, and 2 outputs of LED lamp drive circuit connect the feeder ear of load LED lamp, and it is luminous to be used for the driving LED lamp; In the present embodiment, LED lamp drive circuit 2 includes switch power controller U1, second inductance L 2, diode D1, the 4th capacitor C 4, wherein the output of AC rectification filter circuit links to each other with first end of second inductance L 2, second end of second inductance L 2 links to each other with the drain lead of switch power controller U1 (being the DRAIN pin), the positive pole of diode D1 also links to each other with the drain lead (being the DRAIN pin) of switch power controller U1, the negative pole of diode D1 links to each other with the positive pole of the 4th capacitor C 4, the negative pole of the 4th capacitor C 4 links to each other with first end of second inductance L 2, and first end of second inductance L 2 connects the negative pole feeder ear of load LED lamp, and the negative pole of diode D1 connects the anodal feeder ear of load LED lamp.
Switch power controller U1 is the switch power controller of integrated MOS pipe, its drain lead (being the DRAIN pin) detects internal switch pipe conducting after the high direct voltage, this moment second inductance L 2 upper ends be+, the lower end is-, electric current flows to the earth through second inductance L 2 and switch power controller U1.Electric current is shown off triangular wave since 0 and is become greatly to switch power controller U1 current-limiting points on second inductance L 2, and the inner MOS of switch power controller U1 turn-offs.Produce inverse electromotive force on second inductance L 2 this moment, direction be last-down+, this inverse electromotive force makes diode D1 conducting, with the energy of second inductance L, 2 conduction periods storage by diode D1 supply load LED lamp and the 4th capacitor C 4, thereby finish conversion process of energy.
Power supply constant-current control circuit 3 includes first resistance R 1, second resistance R 2, the 3rd resistance R 3, photoelectrical coupler U2, voltage stabilizing didoe ZD1, wherein first end of second inductance L 2 connects first end of the 3rd resistance R 3, and second end of the 3rd resistance R 3 links to each other with the negative pole of LED lamp again; The negative pole of diode D1 links to each other with the negative pole of voltage stabilizing didoe ZD1, the positive pole of voltage stabilizing didoe ZD1 links to each other with first end of first resistance R 1, second end of first resistance R 1 links to each other with first end of second resistance R 2, second end of second resistance R 2 links to each other with second end of the 3rd resistance R 3, the positive pole of photoelectrical coupler U2 photophore links to each other with second end of first resistance R 1, the negative pole of photoelectrical coupler U2 photophore links to each other with first end of the 3rd resistance R 3, the input of photoelectrical coupler U2 light-receiving device links to each other the output head grounding of photoelectrical coupler U2 light-receiving device with the feedback input pin of switch power controller U1 (being the FB pin).
During the power work, load LED lamp current the 3rd resistance R 3 of flowing through produces pressure drops, this voltage reaches the optocoupler conducting that 1V left and right sides Shi Hui makes photoelectrical coupler U2 the inside, send current changing signal to switch power controller U1 by photoelectrical coupler U2, the electric current of the ON time of switch power controller U1 by controlling inner MOS on can regulating load LED lamp makes under its condition that remains on setting.In the circuit during ZD1 and R1 protection LED lamp open circuit with the output voltage clamper in assigned voltage.
Claims (2)
1, a kind of drive circuit of LED lamp comprises
The AC rectification filter circuit, the input of AC rectification filter circuit links to each other with civil power, is used for converting alternating current to direct current;
The LED lamp drive circuit, the input of LED lamp drive circuit links to each other with the output of AC rectification filter circuit, and the output of LED lamp drive circuit connects the feeder ear of load LED lamp, and it is luminous to be used to drive load LED lamp;
It is characterized in that: described LED lamp drive circuit includes a switch power controller (U1), second inductance (L2), one diode (D1), the 4th electric capacity (C4), wherein the output of AC rectification filter circuit links to each other with first end of second inductance (L2), second end of second inductance (L2) links to each other with the drain lead (DRAIN) of switch power controller (U1), the positive pole of diode (D1) also links to each other with the drain lead (DRAIN) of switch power controller (U1), the negative pole of diode (D1) links to each other with the positive pole of the 4th electric capacity (C4), the negative pole of the 4th electric capacity (C4) links to each other with first end of second inductance (L2), and first end of second inductance (L2) connects the negative pole feeder ear of load LED lamp, and the negative pole of diode (D1) connects the anodal feeder ear of load LED lamp.
2, according to the drive circuit of the LED lamp shown in the claim 1, it is characterized in that: also include the power supply constant-current control circuit, this power supply constant-current control circuit includes first resistance (R1), second resistance (R2), the 3rd resistance (R3), photoelectrical coupler (U2), voltage stabilizing didoe (ZD1), wherein first end of second inductance (L2) connects first end of the 3rd resistance (R3), and second end of the 3rd resistance (R3) links to each other with the negative pole of LED lamp again; The negative pole of diode (D1) links to each other with the negative pole of voltage stabilizing didoe (ZD1), the positive pole of voltage stabilizing didoe (ZD1) links to each other with first end of first resistance (R1), second end of first resistance (R1) links to each other with first end of second resistance (R2), second end of second resistance (R2) links to each other with second end of the 3rd resistance (R3), the positive pole of photoelectrical coupler (U2) photophore links to each other with second end of first resistance (R1), the negative pole of photoelectrical coupler (U2) photophore links to each other with first end of the 3rd resistance (R3), the input of photoelectrical coupler (U2) light-receiving device links to each other with the feedback input pin (FB) of switch power controller (U1), the output head grounding of photoelectrical coupler (U2) light-receiving device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201202927U CN201409247Y (en) | 2009-05-21 | 2009-05-21 | Driving circuit of LED (Light-Emitting Diode) lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201202927U CN201409247Y (en) | 2009-05-21 | 2009-05-21 | Driving circuit of LED (Light-Emitting Diode) lamp |
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| Publication Number | Publication Date |
|---|---|
| CN201409247Y true CN201409247Y (en) | 2010-02-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201202927U Expired - Lifetime CN201409247Y (en) | 2009-05-21 | 2009-05-21 | Driving circuit of LED (Light-Emitting Diode) lamp |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101841959A (en) * | 2010-05-06 | 2010-09-22 | 宁波市鄞州龙源照明电器有限公司 | Drive circuit for load current of high-power controllable LED |
| CN101841960A (en) * | 2010-05-06 | 2010-09-22 | 宁波市鄞州龙源照明电器有限公司 | Controllable LED load current driving circuit |
| CN105805582A (en) * | 2016-05-28 | 2016-07-27 | 海宁市新光源照明科技股份有限公司 | Straight pipe type double-compatible LED lamp |
-
2009
- 2009-05-21 CN CN2009201202927U patent/CN201409247Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101841959A (en) * | 2010-05-06 | 2010-09-22 | 宁波市鄞州龙源照明电器有限公司 | Drive circuit for load current of high-power controllable LED |
| CN101841960A (en) * | 2010-05-06 | 2010-09-22 | 宁波市鄞州龙源照明电器有限公司 | Controllable LED load current driving circuit |
| CN101841959B (en) * | 2010-05-06 | 2012-11-14 | 宁波市鄞州龙源照明电器有限公司 | Drive circuit for load current of high-power controllable LED |
| CN101841960B (en) * | 2010-05-06 | 2012-11-14 | 宁波市鄞州龙源照明电器有限公司 | Controllable LED load current driving circuit |
| CN105805582A (en) * | 2016-05-28 | 2016-07-27 | 海宁市新光源照明科技股份有限公司 | Straight pipe type double-compatible LED lamp |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 315040, Xinhui Road, national hi tech Zone, Zhejiang, Ningbo, 150 Patentee after: NINGBO SUNPU OPTO CO., LTD. Address before: 315040, Xinhui Road, national hi tech Zone, Zhejiang, Ningbo, 150 Patentee before: Ningbo Sunpu-opto Semiconductor Co., Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20100217 |
|
| CX01 | Expiry of patent term |