CN207410555U - A kind of LED drive circuit - Google Patents
A kind of LED drive circuit Download PDFInfo
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- CN207410555U CN207410555U CN201720922777.2U CN201720922777U CN207410555U CN 207410555 U CN207410555 U CN 207410555U CN 201720922777 U CN201720922777 U CN 201720922777U CN 207410555 U CN207410555 U CN 207410555U
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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]
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Abstract
The utility model is related to a kind of LED drive circuits, including sequentially connected filament analog circuit, RC matrix current adjustment circuits, current rectifying and wave filtering circuit, on-off circuit, LED load circuit, further include anti-arcing circuit and detection switching circuit；The output terminal of the anti-arcing circuit is connected to the input terminal of filament analog circuit；The detection switching circuit is connected in parallel with on-off circuit；The anti-arcing circuit disconnects rapidly when circuit generates arcing failure by observation circuit state, plays the role of protecting circuit；The LED drive circuit of the utility model uses anti-arcing design and automatic production process, while coordinates on-off circuit by simple switching circuit, is combined into and meets low cost, small size, can meet the product of compatible electronic ballast and alternating current simultaneously.
Description
Technical field
The utility model is related to a kind of LED drive circuit more particularly to a kind of LED drive circuits of fluorescent tube.
Background technology
LED lamp tube is also referred to as LED fluorescent lamp tube, and light source is using LED as illuminator.Traditional fluorescent tube is also known as fluorescence
Respectively there is a filament at lamp, lamp both ends, filled with micro argon and thin mercury vapour in fluorescent tube, scribble fluorescent powder on tube inner wall, and two
Ultraviolet light is sent during gaseous conduction between a filament, fluorescent powder is made to send visible ray.Due to containing heavy metal pollutants
" mercury " so that the fluorescent tube scrapped is extremely serious to the pollution of environment.And LED lamp tube using light emitting diode as light source,
Light efficiency higher, more energy saving, service life is longer, and more environmentally friendly；The most preferable production of fluorescent tube is replaced as the current stage
Product.
Meanwhile with the enhancing of environmental consciousness, higher and higher to power conservation requirement, LED is obtained extensively in real life
General application, but because also having there are the electric ballast that a large amount of fluorescent lamps use, and in daylight lamp holder on the market using directly friendship
The lamp holder of alternating current input is flowed, also there is the lamp holder using electric ballast, in order to can be with compatible electronic ballast and the lamp of alternating current
Seat, it is therefore desirable to it is a kind of can be with compatible electronic ballast and the driving circuit of alternating current.
But the circuit of compatible electronic ballast and alternating current can be met simultaneously in the prior art mostly using complicated IC controls
Circuit processed, transformer add switch control line or manual switch to switch lamp mode to realize；These control modes can all bring height
The circuit arrangement of cost and higher failure rate, and electronic component is more, volume makes more greatly it be difficult to meet structure space
It is required that design suffers from limitation；And traditional scheme is short of consideration in compatible electronic ballast, when circuit generates arcing event
During barrier, it is impossible to play quick defencive function.
Utility model content
In order to overcome technical problem in the prior art, the utility model provides a kind of LED drive circuit, solves
LED driving circuits cannot compatible electronic ballast and the problem of alternating current simultaneously.
To achieve the above object, the utility model adopts the following technical solution：
A kind of LED drive circuit, including sequentially connected filament analog circuit, RC matrix current adjustment circuits, rectifying and wave-filtering electricity
Road, on-off circuit and LED load circuit further include anti-arcing circuit and detection switching circuit；
The output terminal of the anti-arcing circuit is connected to the input terminal of filament analog circuit；The detection switching circuit is with opening
Powered-down road is connected in parallel；
The anti-arcing circuit disconnects rapidly when circuit generates arcing failure by observation circuit state, plays protection
The effect of circuit.
Further, the filament analog circuit includes resistance R1, R2 and R3, capacitance C1, C2；The resistance R1 and electricity
Hold C1 to be connected in series, the resistance R2 is parallel on capacitance C1, and the capacitance C2 and resistance R3 is connected in parallel.
For above-mentioned filament analog circuit in compatible electronic ballast, filament analog circuit simulates filament pre-heating state, makes
Electric ballast starter works；When connecing alternating current, filament analog circuit becomes EMI filter circuit.
Further, the RC matrix current adjustment circuits include capacitance C3 and resistance R4；The capacitance C3 and resistance R4 is simultaneously
Connection connection.
Above-mentioned RC matrix current adjustment circuits are used to adjust ballast current output, control adjustment complete machine power and adjustment and electricity
The compatibility of sub-ballast.
Further, the current rectifying and wave filtering circuit include rectifier bridge DB1, capacitance C4, C5, C11, resistance R5, inductance L1 with
And diode D1, D2；The capacitance C4 is arranged between No. 3 pins of rectifier bridge DB1 and No. 1 pin；The rectifier bridge DB1's
No. 2 pins are connected to No. 4 pins of rectifier bridge DB1 by inductance L1 and capacitance C11；The resistance R5 is in parallel with inductance L1 even
It connects；Described diode D1, D2 are connected in series, and the cathode of the diode D1 is connected to No. 2 pins of rectifier bridge DB1, and described two
The anode of pole pipe D2 is connected to ground；The capacitance C5 and diode D1, D2 are connected in parallel.
Further, the anti-arcing circuit includes Thermal Cutoffs FT1, FT2, FT3, FT4；The Thermal Cutoffs
FT1, FT2 one end patch pin A1 and A2 respectively, and the other end connects the 3 of rectifier bridge DB1, No. 1 pins respectively；The Thermal Cutoffs
FT3 one end is connected to contact pins A 3, and the other end is connected with capacitance C3；Described Thermal Cutoffs FT4 one end is connected to contact pins A 4, another
End is connected with capacitance C2.
Above-mentioned anti-arcing circuit uses Thermal Cutoffs, and when circuit works normally, Thermal Cutoffs plays electric current guarantor
Dangerous silk effect；When plug, which inputs, loose contact is occurred between contact pin and lamps and lanterns and cause arcing, Thermal Cutoffs rapid thermal conduction
And it fuses, play cut-out circuit and protects the effect of circuit.
Further, the detection switching circuit includes detection circuit and switching circuit, and the detection circuit includes electricity
Hold C9, C10, diode D8, D9, resistance R17 and bilateral diode DB2；The capacitance C9 is connected with diode D8 anodes,
The cathode of diode D8 is connected with one end of bilateral diode DB2, and the cathode of the diode D9 is connected to capacitance C9 and two poles
The common port of pipe D8, anode are connected to ground；Described capacitance C10 one end is connected to the public of diode D8 and bilateral diode DB2
End, the other end are connected to ground；The switching circuit includes diode D6, D7 and silicon-controlled TR1；The control of the silicon-controlled TR1
Pole processed is connected with the other end of bilateral diode DB2, and one end is connected to the cathode of diode D6, D7 simultaneously, and the other end is connected to
Ground.
Above-mentioned detection switching circuit switches open lines high-impedance state when input connects alternating current；Connect electric ballast output
When, switching circuit access low resistance state, the switching tube that main circuit current passes through switching circuit.
Further, the on-off circuit is DC-DC BUCK on-off circuits.When input connects alternating current, the normal work of on-off circuit
Make；When connecing electric ballast output, on-off circuit does not work.
Further, described Thermal Cutoffs FT1, FT2, FT3, FT4 patch the pin of pin using tinned wird material；It connects
The pin of rectifier bridge DB1, capacitance C2, C3 use copper covered steel wire material.
When above-mentioned Thermal Cutoffs pin uses tinned wird material, thermal resistance is small, can quickly detect input contact pin arcing
Caused failure during failure, Thermal Cutoffs are quickly disconnected and shielded；When Thermal Cutoffs pin uses copper covered steel wire
When, thermal resistance is big, and temperature when can slow down tin on pin is transferred, and meets automatic tin production technology, improves production efficiency.
Description of the drawings
Fig. 1 is a kind of circuit diagram of LED drive circuit of the utility model；
Fig. 2 is a kind of circuit modular structure figure of LED drive circuit of the utility model；
Fig. 3 is the connection diagram of fluorescent tube and electric ballast in the utility model；
Fig. 4 is the connection diagram of fluorescent tube and alternating current in the utility model.
Specific embodiment
Below in conjunction with attached drawing and specific embodiment, the utility model is described further：
As shown in Figure 1, a kind of LED drive circuit include sequentially connected filament analog circuit 2, RC matrix current adjustment circuits 3,
Current rectifying and wave filtering circuit 4, on-off circuit 5 and LED load circuit 7 further include anti-arcing circuit 1 and detection switching circuit 6；
The output terminal of the anti-arcing circuit 1 is connected to the input terminal of filament analog circuit 2；The detection switching circuit 6
It is connected in parallel with on-off circuit 5；
The anti-arcing circuit 1 disconnects rapidly when circuit generates arcing failure by observation circuit state, plays protection
The effect of circuit.
The filament analog circuit 2 includes resistance R1, R2 and R3, capacitance C1, C2；The resistance R1 and capacitance C1 goes here and there
Connection connection, the resistance R2 are parallel on capacitance C1, and the capacitance C2 and resistance R3 is connected in parallel.By adjusting resistance value and electricity
Capacitance, can be designed that the simulated impedance similar with Filament of fluorescent lamp parameter, matches electric ballast with this, works as electric ballast
During work, filament loop can work normally.
The RC matrix current adjustment circuits 3 include capacitance C3 and resistance R4；The capacitance C3 and resistance R4 is connected in parallel.It should
Circuit eliminates the inductance in circuit compared with RLC matrix current adjustment circuits, to realize the requirement of small size low cost；Due to city
Electric ballast brand is numerous on field and its working method is various, its output current is caused to have larger difference, this is also direct
When causing most of compatible electronic ballast scheme product band difference electric ballast, power difference is larger or cannot be compatible with etc. and to ask
Topic.The circuit according to compatible ballast output frequencies characteristic, can be designed that suitable impedance value, be played when electric current is larger
Metering function；The angle of flow can be adjusted simultaneously, plays the role of pull-up current when electric current is smaller.Realize the tune of Current compliance
It is whole.
The current rectifying and wave filtering circuit 4 includes rectifier bridge DB1, capacitance C4, C5, C11, resistance R5, inductance L1 and diode
D1、D2；The capacitance C4 is arranged between No. 3 pins of rectifier bridge DB1 and No. 1 pin；No. 2 pins of the rectifier bridge DB1
No. 4 pins of rectifier bridge DB1 are connected to by inductance L1 and capacitance C11；The resistance R5 and inductance L1 is connected in parallel；Described two
Pole pipe D1, D2 is connected in series, and the cathode of the diode D1 is connected to No. 2 pins of rectifier bridge DB1, the sun of the diode D2
Pole is connected to ground；The capacitance C5 and diode D1, D2 are connected in parallel.Wherein rectifier bridge DB1 utilizes two with diode D1, D2
Alternating current is converted to Unidirectional direct-current electricity by the unilateal conduction characteristic of pole pipe, and capacitance C4 plays the role of low-pass filtering, after rectification, electricity
Hold C5, C11, inductance L1 and resistance R5 forms π type low-pass filter circuits, plays the role of EMI improvement.
The anti-arcing circuit 1 includes Thermal Cutoffs FT1, FT2, FT3, FT4；Described Thermal Cutoffs FT1, FT2 mono-
End patches pin A1 and A2 respectively, and the other end connects the 3 of rectifier bridge DB1, No. 1 pins respectively；Thermal Cutoffs FT3 one end connection
To contact pins A 3, the other end is connected with capacitance C3；Described Thermal Cutoffs FT4 one end is connected to contact pins A 4, the other end and capacitance C2
Connection.
The detection switching circuit 6 includes detection circuit and switching circuit, and the detection circuit includes capacitance C9, C10,
Diode D8, D9, resistance R17 and bilateral diode DB2；The capacitance C9 is connected with diode D8 anodes, diode D8's
Cathode is connected with one end of bilateral diode DB2, and the cathode of the diode D9 is connected to the public of capacitance C9 and diode D8
End, anode are connected to ground；Described capacitance C10 one end is connected to the common port of diode D8 and bilateral diode DB2, and the other end connects
It is connected to ground；The switching circuit includes diode D6, D7 and silicon-controlled TR1；The control pole of the silicon-controlled TR1 and two-way two
The other end connection of pole pipe DB2, one end are connected to the cathode of diode D6, D7 simultaneously, and the other end is connected to ground.
When above-mentioned detection switching circuit 6 connects electric ballast work, ballast output is high-frequency signal：Since capacitance leads to friendship
Blocking acts on, can be by capacitance C9 accesses, and diode D8 rectifications, capacitance C10 energy storage to certain voltage value triggers two-way two pole again
Pipe DB2 drives silicon-controlled TR1, opens switching circuit.Wherein diode D9, resistance R17 are each served as to discharge to capacitance C9, C10
Effect；Switching circuit is dragged down switching power circuit power supply electrical level by diode D6, silicon-controlled TR1, makes Switching Power Supply thorough
Bottom is closed；Simultaneously another access is provided to load by diode D7, silicon-controlled TR1.
The on-off circuit 5 is DC-DC BUCK on-off circuits.
The pin that described Thermal Cutoffs FT1, FT2, FT3, FT4 patch pin uses tinned wird material；Connect rectifier bridge
The pin of DB1, capacitance C2, C3 use copper covered steel wire material.
The LED load circuit 7 includes filter capacitor E in parallel successively, resistance R18 and LED.
It is electrically connected as shown in Fig. 2, fluorescent tube is connected to electric ballast Zai Yu cities by four contact pins.
As shown in figure 3, fluorescent tube is directly electrically connected with city.
Finally it should be noted that：Above example is only to illustrate the technical solution of the utility model, rather than its limitations；
For those skilled in the art, the technical solution recorded in previous embodiment can still be repaiied
Change and equivalent substitution either is carried out to which part or all technical characteristic；And these modifications or replacement, do not make corresponding skill
The essence of art scheme departs from the scope of protection of the utility model.
Claims (8)
1. a kind of LED drive circuit, including sequentially connected filament analog circuit, RC matrix current adjustment circuits, current rectifying and wave filtering circuit,
On-off circuit and LED load circuit, it is characterised in that：Further include anti-arcing circuit and detection switching circuit；
The output terminal of the anti-arcing circuit is connected to the input terminal of filament analog circuit；The detection switching circuit and switch electricity
Road is connected in parallel；
The anti-arcing circuit disconnects rapidly when circuit generates arcing failure by observation circuit state, plays protection circuit
Effect.
2. a kind of LED drive circuit as described in claim 1, it is characterised in that：The filament analog circuit include resistance R1,
R2 and R3, capacitance C1, C2；The resistance R1 and capacitance C1 is connected in series, and the resistance R2 is parallel on capacitance C1, the electricity
Hold C2 and resistance R3 to be connected in parallel.
3. a kind of LED drive circuit as described in claim 1, it is characterised in that：The RC matrix current adjustment circuits include capacitance
C3 and resistance R4；The capacitance C3 and resistance R4 is connected in parallel.
4. a kind of LED drive circuit as described in claim 1, it is characterised in that：The current rectifying and wave filtering circuit includes rectifier bridge
DB1, capacitance C4, C5, C11, resistance R5, inductance L1 and diode D1, D2；The capacitance C4 is arranged at No. 3 of rectifier bridge DB1
Between pin and No. 1 pin；No. 2 pins of the rectifier bridge DB1 are connected to the 4 of rectifier bridge DB1 by inductance L1 and capacitance C11
Number pin；The resistance R5 and inductance L1 is connected in parallel；Described diode D1, D2 are connected in series, the cathode of the diode D1
No. 2 pins of rectifier bridge DB1 are connected to, the anode of the diode D2 is connected to ground；The capacitance C5 and diode D1, D2 are simultaneously
Connection connection.
5. a kind of LED drive circuit as described in claim 1, it is characterised in that：The anti-arcing circuit includes Temperature protection
Silk FT1, FT2, FT3, FT4；Described Thermal Cutoffs FT1, FT2 one end patches pin A1 and A2 respectively, and the other end connects rectification respectively
3, No. 1 pins of bridge DB1；Described Thermal Cutoffs FT3 one end is connected to contact pins A 3, and the other end is connected with capacitance C3；The temperature
Degree fuse FT4 one end is connected to contact pins A 4, and the other end is connected with capacitance C2.
6. a kind of LED drive circuit as described in claim 1, it is characterised in that：The detection switching circuit includes detection electricity
Road and switching circuit, the detection circuit include capacitance C9, C10, diode D8, D9, resistance R17 and bilateral diode
DB2；The capacitance C9 is connected with diode D8 anodes, and the cathode of diode D8 is connected with one end of bilateral diode DB2, described
The cathode of diode D9 is connected to the common port of capacitance C9 and diode D8, and anode is connected to ground；Capacitance C10 one end connection
In the common port of diode D8 and bilateral diode DB2, the other end is connected to ground；The switching circuit includes diode D6, D7
And silicon-controlled TR1；The control pole of the silicon-controlled TR1 is connected with the other end of bilateral diode DB2, and one end is connected to simultaneously
The cathode of diode D6, D7, the other end are connected to ground.
7. a kind of LED drive circuit as described in claim 1, it is characterised in that：The on-off circuit is opened for DC-DC BUCK
Powered-down road.
8. a kind of LED drive circuit as claimed in claim 5, it is characterised in that：The Thermal Cutoffs FT1, FT2, FT3,
The pin that FT4 patches pin uses tinned wird material；Rectifier bridge DB1 is met, the pin of capacitance C2, C3 use copper covered steel wire material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720922777.2U CN207410555U (en) | 2017-07-27 | 2017-07-27 | A kind of LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720922777.2U CN207410555U (en) | 2017-07-27 | 2017-07-27 | A kind of LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207410555U true CN207410555U (en) | 2018-05-25 |
Family
ID=62322610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720922777.2U Active CN207410555U (en) | 2017-07-27 | 2017-07-27 | A kind of LED drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207410555U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110786079A (en) * | 2019-07-22 | 2020-02-11 | 深圳市豪恩智能物联股份有限公司 | Lamp tube, protection circuit and protection device applied to lamp tube |
| EP3641501A1 (en) * | 2018-10-16 | 2020-04-22 | Xiamen Eco Lighting Co., Ltd. | Led driving circuit and led apparatus |
-
2017
- 2017-07-27 CN CN201720922777.2U patent/CN207410555U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3641501A1 (en) * | 2018-10-16 | 2020-04-22 | Xiamen Eco Lighting Co., Ltd. | Led driving circuit and led apparatus |
| CN110786079A (en) * | 2019-07-22 | 2020-02-11 | 深圳市豪恩智能物联股份有限公司 | Lamp tube, protection circuit and protection device applied to lamp tube |
| CN110786079B (en) * | 2019-07-22 | 2021-09-21 | 深圳市豪恩智能物联股份有限公司 | Lamp tube, protection circuit and protection device applied to lamp tube |
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