CN204761789U - LED drive circuit and printed circuit board - Google Patents
LED drive circuit and printed circuit board Download PDFInfo
- Publication number
- CN204761789U CN204761789U CN201520466421.3U CN201520466421U CN204761789U CN 204761789 U CN204761789 U CN 204761789U CN 201520466421 U CN201520466421 U CN 201520466421U CN 204761789 U CN204761789 U CN 204761789U
- Authority
- CN
- China
- Prior art keywords
- led
- output end
- drive circuit
- led drive
- circuit board
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model relates to a LED lighting technology field especially relates to a LED drive circuit and printed circuit board, and this LED drive circuit includes rectifier circuit and EMC filter circuit, it is luminous with drive LED that rectifier circuit converts alternating current power supply into stable DC power supply, EMC filter circuit with rectifier circuit connects to filtering electromagnetism harmonic noise reaches the electromagnetic compatibility purpose. The utility model discloses choose miniaturized components and parts for use, PCB design overall arrangement make full use of LED lamp holder inner space to accord with technical indicators such as EMC requirement.
Description
Technical field
The utility model relates to technical field of LED illumination, particularly relates to a kind of LED drive circuit and a kind of printed circuit board.
Background technology
LED is widely used as the electric light source of a new generation, it can design many category, volume because of drive circuit in design is in early days restricted, generally all design a plastic casing in lamp holder and cell-shell joining place to be used for placing drive circuit, differ larger with ordinary incandescent lamp so in appearance.Develop a kind of filament lamp without plastic casing recently, adopt lamp holder directly bonding with glass cell-shell, driving power is placed on lamp holder inside, and overall appearance is closer to incandescent lamp, and market acceptance level is also very high.But the problem produced is high to the volume requirement of driving power, needs the driving power of small size, and particularly E14 lamp holder internal cavity is less, and design driven power supply is more difficult thereupon.E14 driving power commercially available at present has 3 types: resistance-capacitance depressurization, linear constant current, Switching Power Supply.Wherein, the shortcoming of resistance-capacitance depressurization is a dividing potential drop not constant current, and output parameter is comparatively large with power network fluctuation, and power factor is low, and product stability is poor, and fault is more.The shortcoming of linear constant current is higher to the voltage request of LED strip connection, and within the scope of certain voltage, just must can be designed into optimization, the current light efficiency of LED is more and more higher, and needing to reduce quantity could accomplish optimization cost, and this contradiction is difficult to balance.Switching Power Supply overcomes the shortcoming of resistance-capacitance depressurization and linear constant current, but producing new problem is cannot increase filter circuit because volume is restricted, and Electro Magnetic Compatibility (EMC) problem cannot solve.So the driving of adopted Switching Power Supply scheme is all that the EMC value that transfinites cannot do certification on the market.
Utility model content
The utility model, for the limitation of prior art, provides a kind of LED drive circuit and a kind of printed circuit board in a creative way, and this LED drive circuit volume is little can put into lamp holder, and meets the technical indicators such as EMC requirement.
The utility model solves the problems of the technologies described above adopted technical scheme:
There is provided a kind of LED drive circuit, it is characterized in that, be applied to driving LED lamp luminous, described LED drive circuit comprises:
AC power, in order to provide alternating current;
Rectification module, has ac input end and DC output end, and described rectification module is connected with described AC power by described ac input end, after carrying out rectification to described alternating current, exports direct current through described DC output end;
EMC filtration module, is connected with described DC output end;
Voltage reduction module, is connected with described EMC filtration module and described LED respectively; And
The direct current that described DC output end exports is after the filtering of described EMC filtration module, and filtered direct current is depressurized to the rated voltage of described LED by described voltage reduction module, to drive described LED luminous.
Preferably, above-mentioned LED drive circuit, wherein, described LED is LED silk lamp.
Preferably, above-mentioned LED drive circuit, wherein, described LED drive circuit also comprises a fuse, is connected to described ac input end.
Preferably, above-mentioned LED drive circuit, wherein, described rectification module comprises bridge rectifier, with by described AC rectification for direct current.
Preferably, above-mentioned LED drive circuit, wherein, described DC output end comprises cathode output end and cathode output end, and described LED is connected between described cathode output end and described cathode output end.
Preferably, above-mentioned LED drive circuit, wherein, described EMC filtration module comprises a rectifier inductor and some capacitors;
Described rectifier inductor is connected to described DC output end;
Described some capacitors are connected in parallel between described cathode output end and described cathode output end.
Preferably, above-mentioned LED drive circuit, wherein, described voltage reduction module comprises a buck inductor, and described rectifier inductor, described buck inductor and described LED are connected in series between described cathode output end and cathode output end.
The utility model also provides a kind of printed circuit board, it is characterized in that, the electronic devices and components in any one module above-mentioned are all arranged on described printed circuit board.
Preferably, above-mentioned printed circuit board, wherein, described printed circuit board adopts perpendicular version arrangement mode.
Preferably, above-mentioned printed circuit board, wherein, described LED comprises lamp holder and cell-shell, and described printed circuit board embeds and is arranged in described lamp holder, to drive described LED luminous.
Technique scheme tool has the following advantages or beneficial effect: LED drive circuit of the present utility model comprises rectification module, EMC filtration module and voltage reduction module, select miniaturized components and parts, printed circuit board (PCB) layout makes full use of E14 lamp holder inner space, achieve the LED drive power product design can putting into lamp holder, and meet the technical indicators such as Electro Magnetic Compatibility (EMC) requirement.
Accompanying drawing explanation
By reading the detailed description done non-limiting example with reference to the following drawings, the utility model and feature, profile and advantage will become more apparent.It should be noted that in accompanying drawing and proportionally do not draw associated components, focus on purport of the present utility model is shown.
Fig. 1 is the circuit diagram of LED drive circuit of the present utility model;
Fig. 2 is the PCB top layer arrangement schematic diagram of LED drive circuit of the present utility model;
Fig. 3 is the PCB bottom arrangement schematic diagram of LED drive circuit of the present utility model;
Fig. 4 is the EMC test result schematic diagram of LED drive circuit of the present utility model.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, the utility model is further described, but not as restriction of the present utility model.
A kind of LED drive circuit of the present utility model, its circuit structure adopts voltage-dropping type circuit to be main body, mainly comprise rectification circuit and EMC filter circuit, wherein rectification circuit has ac input end and DC output end, ac input end is connected with AC network, export with driving LED luminous in order to power supply supply is converted to galvanic current source through DC output end, EMC filter circuit, in order to the electromagnetism harmonic noise in filtering LED drive power, reaches Electro Magnetic Compatibility (EMC) object.
With reference to Fig. 1, LED drive circuit of the present utility model, mainly comprise: rectification module, comprise ac input end (AC-in), DC output end (DC-out) and a rectifier bridge stack (DB1, be made up of four diodes), ac input end (live wire L and zero line N) is connected with AC network, DC output end (exporting positive negative dc voltage) is connected with LED load, and AC network and LED load form loop by rectifier bridge stack DB1, AC rectification is that direct current exports by rectifier bridge stack DB1.EMC filtration module, comprise an inductor L1 and some capacitors (preferred C1 of the present embodiment, C2, C3, C4), inductor L1 is connected with rectifier bridge stack DB1, capacitor C1, C2, C3, C4 is connected in parallel, and adopts midget capacitor can not increase the volume of LED drive power to increase electric capacity simultaneously.EMC filtration module can exceed the electric current of limit value in filtering LED drive power circuit.Voltage reduction module, comprises a buck inductor L2, is connected with the DC output end positive pole of rectification module, to carry out dividing potential drop to LED drive power circuit.Control chip module U1, is connected with buck inductor L2, to control the break-make of LED drive power circuit.
Wherein, control chip U1 comprises 5 pins, and resistance R1, R2 and electric capacity C5 are the power supply circuits of control chip U1, and control chip U1 detects the voltage on resistance R3, controls output current and the switching time of inner metal-oxide-semiconductor, to keep the voltage on R3 constant.
As a preferred embodiment, LED drive circuit of the present utility model also comprises a fuse F1, is connected with live wire input, is not burned to protect LED drive circuit.
For miniaturizing the elements, the printed circuit board (PBC) of LED drive circuit of the present utility model adopts perpendicular version arrangement mode, and the arrangement of its top layer and bottom arrangement schematic diagram are respectively as shown in Figures 2 and 3.In Fig. 2 and Fig. 3, corresponding components and parts indicate, and the components and parts representative wherein do not indicated is blocked by other components and parts viewed from this angle, does not therefore mark all components and parts in complete edition embodiment LED drive circuit in Fig. 2 and Fig. 3.
The PCB design layout of arranging because adopting perpendicular version, LED drive circuit of the present utility model can put into lamp holder, takes full advantage of E14 lamp holder inner space.In the present embodiment, LED drive circuit (being also the chassis diameter of LED drive power) length in the horizontal direction shown in Fig. 2 is 12mm, and in the vertical direction shown in Fig. 2, (being also the entire length of LED drive power) length is 15mm.
Further, although LED driving achieves, volume is little, efficiency advantages of higher, but electromagnetic interference (EMI) problem can be there is simultaneously, therefore the utility model by increasing EMC filter circuit in LED drive circuit structure, carry out filtering electromagnetism harmonic noise, reach the object of Electro Magnetic Compatibility (EMC), to enable LED drive circuit of the present utility model by EMC authentication test, the report of its EMC test passes as shown in Figure 4.Electro Magnetic Compatibility (ElectromagneticCompatibility, EMC) refers to that equipment or system can normally work and not to the ability of the electromagnetic disturbance that anything formation in this environment can not be born in its electromagnetic environment.One, face line represents the calibration curve meeting EMC test in fig. 4, the upper, below line represent the EMC test curve of LED drive circuit in the present embodiment, can find out, LED drive circuit of the present utility model, because adding EMC filter circuit, can solve EMC problem completely, pass through authentication test.
In sum, the utility model discloses a kind of LED drive circuit and a kind of printed circuit board, comprise rectification module and voltage reduction module, coordinate EMC filter circuit simultaneously, select miniaturized components and parts, PCB design layout makes full use of E14 lamp holder inner space, achieves the LED drive power product design can putting into lamp holder, meets the technical indicators such as EMC requirement.
It should be appreciated by those skilled in the art that those skilled in the art can realize various change case in conjunction with prior art and above-described embodiment, such change case does not affect flesh and blood of the present utility model, does not repeat them here.
Above preferred embodiment of the present utility model is described.It is to be appreciated that the utility model is not limited to above-mentioned particular implementation, the equipment wherein do not described in detail to the greatest extent and structure are construed as to be implemented with the common mode in this area; Any those of ordinary skill in the art, do not departing under technical solutions of the utility model ambit, the Method and Technology content of above-mentioned announcement all can be utilized to make many possible variations and modification to technical solutions of the utility model, or being revised as the Equivalent embodiments of equivalent variations, this does not affect flesh and blood of the present utility model.Therefore, every content not departing from technical solutions of the utility model, according to technical spirit of the present utility model to any simple modification made for any of the above embodiments, equivalent variations and modification, all still belongs in the scope of technical solutions of the utility model protection.
Claims (10)
1. a LED drive circuit, is characterized in that, be applied to driving LED lamp luminous, described LED drive circuit comprises:
AC power, in order to provide alternating current;
Rectification module, has ac input end and DC output end, and described rectification module is connected with described AC power by described ac input end, after carrying out rectification to described alternating current, exports direct current through described DC output end;
EMC filtration module, is connected with described DC output end;
Voltage reduction module, is connected with described EMC filtration module and described LED respectively; And
The direct current that described DC output end exports is after the filtering of described EMC filtration module, and filtered direct current is depressurized to the rated voltage of described LED by described voltage reduction module, to drive described LED luminous.
2. LED drive circuit according to claim 1, is characterized in that, described LED is LED silk lamp.
3. LED drive circuit according to claim 1, is characterized in that, described LED drive circuit also comprises a fuse, is connected to described ac input end.
4. LED drive circuit according to claim 1, is characterized in that, described rectification module comprises bridge rectifier, with by described AC rectification for direct current.
5. LED drive circuit according to claim 1, is characterized in that, described DC output end comprises cathode output end and cathode output end, and described LED is connected between described cathode output end and described cathode output end.
6. LED drive circuit according to claim 5, is characterized in that, described EMC filtration module comprises a rectifier inductor and some capacitors;
Described rectifier inductor is connected to described DC output end;
Described some capacitors are connected in parallel between described cathode output end and described cathode output end.
7. LED drive circuit according to claim 6, it is characterized in that, described voltage reduction module comprises a buck inductor, and described rectifier inductor, described buck inductor and described LED are connected in series between described cathode output end and described cathode output end.
8. a printed circuit board, is characterized in that, the electronic devices and components in the claims 1 ~ 7 in any one module are all arranged on described printed circuit board.
9. printed circuit board according to claim 8, is characterized in that, described printed circuit board adopts perpendicular version arrangement mode.
10. printed circuit board according to claim 8, is characterized in that, described LED comprises lamp holder and cell-shell, and described printed circuit board embeds and is arranged in described lamp holder, to drive described LED luminous.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520466421.3U CN204761789U (en) | 2015-07-01 | 2015-07-01 | LED drive circuit and printed circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520466421.3U CN204761789U (en) | 2015-07-01 | 2015-07-01 | LED drive circuit and printed circuit board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204761789U true CN204761789U (en) | 2015-11-11 |
Family
ID=54476451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520466421.3U Expired - Fee Related CN204761789U (en) | 2015-07-01 | 2015-07-01 | LED drive circuit and printed circuit board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204761789U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108347806A (en) * | 2018-03-15 | 2018-07-31 | 常州阿拉丁照明科技股份有限公司 | A kind of linear power supply that suitable lamp bead is linearly arranged arrangement circuit |
-
2015
- 2015-07-01 CN CN201520466421.3U patent/CN204761789U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108347806A (en) * | 2018-03-15 | 2018-07-31 | 常州阿拉丁照明科技股份有限公司 | A kind of linear power supply that suitable lamp bead is linearly arranged arrangement circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201986238U (en) | Light-emitting diode (LED) lamp tube driver | |
| CN201774706U (en) | Drive circuit of semiconductor LED illumination high-brightness ceiling lamp | |
| CN201210762Y (en) | Embedded power source for LED fluorescent tube | |
| CN204761789U (en) | LED drive circuit and printed circuit board | |
| CN203574891U (en) | Capacitance-resistance voltage-reduction non-isolated type LED driving power supply | |
| CN103731950B (en) | Illuminator and voltage reduction method thereof | |
| CN202565513U (en) | Built-in drive power of light-emitting diode (LED) fluorescent lamp | |
| CN205453496U (en) | Chip mounter equipment's power supply circuit | |
| CN101865401A (en) | Aid-to-navigation lamp | |
| CN202435643U (en) | Light emitting diode (LED) lamp | |
| CN202535579U (en) | Constant current circuit and light-emitting diode (LED) lamp | |
| CN205040055U (en) | Light -emitting diode driving circuit | |
| CN204014174U (en) | A kind of digital control LED streetlamp driving power supply | |
| CN207692103U (en) | A kind of driving circuit for G4 LED light | |
| CN105657886A (en) | Passive harmonic-filter direct-current high-voltage direct driving LED method and circuit thereof | |
| CN207118025U (en) | Alternating current circuit module and led light source | |
| CN205160839U (en) | Passive harmonic filter high voltage DC directly drives LED circuit | |
| CN103619093A (en) | A LED integrated light source | |
| CN103517486A (en) | Led fluorescent lamp driving circuit | |
| CN103687209A (en) | Alternating-current drive circuit of LED streetlight | |
| CN202713709U (en) | LED fluorescent lamp drive circuit | |
| CN203167342U (en) | Constant current LED lamp fixture | |
| CN202852459U (en) | LED fluorescent lamp with external driving power supply | |
| CN203872410U (en) | Power supply in LED lamp tube | |
| CN203761655U (en) | Section-dimming constant current drive power with compatible electronic rectifiers and inductive rectifiers |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151111 Termination date: 20200701 |