CN103841693A - Constant current drive circuit and LED light source lighting circuit with constant current drive circuit - Google Patents
Constant current drive circuit and LED light source lighting circuit with constant current drive circuit Download PDFInfo
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- CN103841693A CN103841693A CN201210474951.3A CN201210474951A CN103841693A CN 103841693 A CN103841693 A CN 103841693A CN 201210474951 A CN201210474951 A CN 201210474951A CN 103841693 A CN103841693 A CN 103841693A
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Abstract
The invention discloses a constant current drive circuit (100) which comprises a rectification and filter circuit, a constant current drive integrated circuit and a butt joint part (101). The butt joint part comprises a butt joint end (1011), a connecting end (1012) and first, second and third terminals (1, 2 and 3) which are located between the butt joint end and the connecting end. The tail ends of the second terminal and the third terminal are roughly located in the same straight line, and are closer to the butt joint end compared with the tail end of the first terminal. The first terminal is directly connected with the rectification and filter circuit through a first wire. The second terminal and the third terminal are not directly connected with a rectification and drive circuit through a wire. The second terminal and the third terminal are connected in parallel and access the constant current drive integrated circuit in three ways.
Description
[technical field]
The present invention relates to a kind of drive circuit, especially refers to a kind of constant-current drive circuit of LED light source.
[background technology]
LED(Light Emitting Diode) light fixture has that the life-span is long, light efficiency is high, shock resistance, low energy consumption etc. advantage, belong to green energy-conserving and environment-protective illumination, now be widely used in Lumination & Decoration field, and along with encouragement and the popularization of national governments, LED lamp is more and more universal and have the trend of replacing gradually traditional lighting.
LED lamp demand motive circuit is lighted, thereby traditional drive circuit docks and lights LED light source with LED light source plate.In real operation, in the time installing or keep in repair LED lamp, may first drive circuit be docked to energising with power supply and be loaded on LED light source plate, or LED light source plate disconnects with drive circuit in the situation that drive circuit is switched on, in this case, the electrochemical capacitor of drive circuit continues charging, makes continuous rising of load of drive circuit open end exceed the carrying limit of LED light source plate, in the time that LED light source plate docks with drive circuit again, LED light source plate can be punctured by moment and be damaged.
Therefore,, in order to overcome above-mentioned defect, be necessary to provide a kind of improved LED light source drive circuit.
[summary of the invention]
The object of the present invention is to provide a kind of constant-current drive circuit of supporting hot plug.
To achieve these goals, the present invention adopts following technical scheme: a kind of constant-current drive circuit comprises current rectifying and wave filtering circuit, constant current drive integrated circult, and docking section, docking section comprises butt end and link, docking section also comprise between butt end and link first, second, the 3rd terminal, the end of the second terminal and the 3rd terminal is roughly positioned at the end of same straight line and relative the first terminal and butt end distance is nearer, the first terminal is directly connected with rectification circuit filtering by the first wire, second, the 3rd terminal is not directly connected with rectification drive circuit by wire, second, the 3rd terminal Fen San in parallel road access constant current drive integrated circult.
Compared to prior art, LED light source drive circuit of the present invention has following advantage: drive circuit can be docked with LED light source plate the load voltage in the situation that and can not punctured LED light source plate and cause light source board to damage by circuit design.
The object of the invention is also to provide a kind of LED light source lighting circuit of supporting hot plug.
To achieve these goals, the present invention adopts following technical scheme: a kind of LED light source lighting circuit, the LED light source plate that it comprises constant-current drive circuit and docks with constant-current drive circuit, constant-current drive circuit comprises current rectifying and wave filtering circuit, constant current drive integrated circult, and docking section, docking section comprises butt end and link, LED light source plate has a docking part, the docking section of LED light source plate has a butt end and a link, dock with the butt end of the docking section of drive circuit the butt end of LED light source plate, docking section also comprise between butt end and link first, second, the 3rd terminal, the end of the second terminal and the 3rd terminal is roughly positioned at the end of same straight line and relative the first terminal and butt end distance is nearer, the first terminal is directly connected with rectification circuit filtering by the first wire, second, the 3rd terminal is not directly connected with rectification drive circuit by wire, second, the 3rd terminal Fen San in parallel road access constant current drive integrated circult, the docking section of LED light source plate has the 4th, the 5th, the six or three terminal, when docking, second of the docking section of constant-current drive circuit, the 5th of the docking section of the 3rd terminal and LED light source plate, the 6th first conducting of terminal, then the 4th terminal conducting again of the first terminal of the docking section of constant-current drive circuit and LED light source plate.
Compared to prior art, LED light source lighting circuit of the present invention has following advantage: between drive circuit and LED light source plate, dock by the docking section with three terminals, and the syndeton of terminal and inside circuit makes this lighting circuit support the hot plug between LED light source and drive circuit and can not damage LED.
[brief description of the drawings]
Fig. 1 is the structural representation of LED lamp drive circuit of the present invention.
[embodiment]
Shown in Fig. 1, thereby LED lamp drive circuit 100 of the present invention provides power supply for docking with LED light source plate 200 for LED light source plate 200.
The input voltage of drive circuit 100 is 220V, comprises the current rectifying and wave filtering circuit being connected with external power source, the constant current drive integrated circult being connected with current rectifying and wave filtering circuit, switching tube Q1, current-limiting inductance L1, sustained diode 1, output filter capacitor C1 and docking section 101.LED light source plate 200 also has docking section 201, and drive circuit 100 has been connected docking with LED light source plate 200 by docking section 101,201 separately.The docking section 101 of drive circuit 100 has a butt end 1011 and a link 1012, and wherein butt end 1011 is in order to dock with the docking section 201 of LED light source plate 200, and link 1012 is in order to be connected with the internal circuit of drive circuit 100.In the present embodiment, LED is 20 (LED1, LED2 to LED20).In other embodiment, the number of LED can change.The docking section 101 of drive circuit 100 has three butt, and wherein the end of the second terminal 2 and the 3rd terminal 3 is roughly positioned at the end of same straight line and relative the first terminal 1 and butt end 1011 distances are nearer.The end of the first terminal 1 compared with the end-to-end distance of second, third terminal 2,3 away from butt end 1011.
The first terminal 1 is by the first wire a and rectification circuit conducting, and wherein constant current drive integrated circult is connected in parallel on the first wire a above, and second, third terminal 2,3 does not all directly connect current rectifying and wave filtering circuit.Between second, third terminal 2,3, connect an electrochemical capacitor C1, the positive pole of electrochemical capacitor C1 is positioned at second terminal 2 one end.Output circuit after second, third terminal 2,3 connects is in parallel with constant current drive integrated circult by current-limiting inductance L1 Hou Fen tri-tunnel the second wire b, c, d.The second wire b is directly communicated with constant current drive integrated circult.One end of privates c is connected with the second wire b by switching tube Q1, and one end of wire d is connected with switching tube Q1 by wire e, then is connected with the second wire b via switching tube Q1.The other end of privates c, d connects respectively constant current drive integrated circult.A sustained diode 1 in parallel between the second wire b and the first wire a.Then ground connection of connecting resistance R1 after wire e is connected with wire d.
The docking section 201 of LED light source plate 200 has a butt end 2011 and a link 2012, and dock with the butt end 1011 of the docking section 101 of drive circuit 100 butt end 2011.Docking section 201 has the 4th, the 5th, the six or three terminal 4,5,6.Four, after Five-terminals 4,5 parallel connections, be connected with LED light source plate 200, the 6th terminal 6 is directly connected with LED light source plate 200 by wire.The end of the 4th terminal 4, Five-terminals 5 and the 6th terminal 6 is roughly positioned at same straight line.
Thereby drive circuit 100 and LED light source plate 200 are by docking section 101,201 docking LED light source consisting lighting circuits separately.
In the time of normal use, the first terminal 1 is connected with the 4th terminal 4, the second terminal 2 is connected with Five-terminals 5, the 3rd terminal 3 is connected with the 6th terminal 6, the alternating current of 220V obtains required direct current through current rectifying and wave filtering circuit, constant current drive integrated circult output high level is to the grid of switching tube Q1, Q1 conducting, electric current is through the first terminal 1 and the 4th terminal 4, LED light source plate, the 6th terminal 6 and the 3rd terminal 3, current-limiting inductance L1, switching tube Q1 and resistance R 1 turn back to ground, give electrochemical capacitor C1 charging through Five-terminals 5 and second terminal 2 of binding post simultaneously, because the electric current of inductance lags behind voltage, electric current rises gradually, voltage on R1 also rises thereupon, in the time rising to the threshold voltage of constant current drive integrated circult, constant current drive integrated circult output low level, switching tube Q1 closes and not conducting, current-limiting inductance L1 continues as the power supply of LED light source plate through sustained diode 1 by docking section 101, until inductance L 1 is discharged, constant current drive integrated circult zero passage detection pin detects low level, the defeated high level of constant current drive integrated circult, repeat a process, make LED obtain constant current.
In the time of energising, may or install due to maintenance when the docking section of LED light source plate 200 201 is disconnected with the docking section 101 of drive circuit 100, due to the first terminal 1 and the 4th terminal 4 respectively with docking section 101, 201 butt end 1011, 2011 is far away, therefore the first terminal 1 and the 4th terminal 4 can first disconnect, now electrochemical capacitor C1 can not charge again, electrochemical capacitor C1 continues through docking section 101, the second terminal 2 of 201 and Five-terminals 5 and the electric discharge of LED light source plate, directly cause docking section 101, 201 disconnect completely, now the voltage at the two ends of electrochemical capacitor C1 is far below the normal pressure drop of LED.When again by docking section 101,201 docking, the second terminal 2 and Five-terminals 5, the 3rd terminal 3 and the 6th terminal 6 are first connected, and now electrochemical capacitor C1 is in parallel with LED light source plate, and last the first terminal 1 and the 4th terminal 4 are connected.Circuit is resumed work, voltage when whole process LED light source plate two ends do not occur that the LED higher than 64V is normal, thus also just there will not be LED overcurrent, thus realize the LED hot plug of LED constant-flow driver.
Claims (10)
1. a constant-current drive circuit comprises current rectifying and wave filtering circuit, constant current drive integrated circult, and docking section, described docking section comprises butt end and link, it is characterized in that: described docking section also comprise between described butt end and link first, second, the 3rd terminal, the end of described the second terminal and the 3rd terminal is roughly positioned at the end of same straight line and relative the first terminal and butt end distance is nearer, described the first terminal is directly connected with rectification circuit filtering by the first wire, described second, the 3rd terminal is not directly connected with rectification drive circuit by wire, described second, the 3rd terminal Fen San in parallel accesses described constant current drive integrated circult in road.
2. constant-current drive circuit as claimed in claim 1, is characterized in that: between described second, third terminal, connect an electrochemical capacitor, the positive pole of described electrochemical capacitor is positioned at second terminal one end.
3. constant-current drive circuit as claimed in claim 2, it is characterized in that: after described second, third terminal electrochemical capacitor in parallel, the negative pole output circuit of electrochemical capacitor is in parallel with constant current drive integrated circult by after current-limiting inductance point of three line conductors, described three line conductors be respectively second, third, privates.
4. constant-current drive circuit as claimed in claim 3, is characterized in that: described the second wire is directly communicated with described constant current drive integrated circult, and one end of described privates is connected with described the second wire by described switching tube.
5. constant-current drive circuit as claimed in claim 4, it is characterized in that: one end of described privates is connected with described switching tube by one the 5th wire, be connected with described the second wire via described switching tube, the other ends described the 3rd, privates connect respectively described constant current drive integrated circult again.
6. constant-current drive circuit as claimed in claim 4, is characterized in that: a fly-wheel diode in parallel between described the second wire and the first wire.
7. constant-current drive circuit as claimed in claim 5, is characterized in that: then ground connection of connecting resistance after described the 5th wire is connected with privates.
8. a LED light source lighting circuit, the LED light source plate that it comprises constant-current drive circuit and docks with constant-current drive circuit, described constant-current drive circuit comprises current rectifying and wave filtering circuit, constant current drive integrated circult, and docking section, described docking section comprises butt end and link, described LED light source plate has a docking part, the docking section of described LED light source plate has a butt end and a link, dock with the butt end of the docking section of described drive circuit the butt end of described LED light source plate, it is characterized in that: described docking section also comprise between described butt end and link first, second, the 3rd terminal, the end of described the second terminal and the 3rd terminal is roughly positioned at the end of same straight line and relative the first terminal and butt end distance is nearer, described the first terminal is directly connected with rectification circuit filtering by the first wire, described second, the 3rd terminal is not directly connected with rectification drive circuit by wire, described second, the 3rd terminal Fen San in parallel accesses described constant current drive integrated circult in road, the docking section of described LED light source plate has the 4th, the 5th, the six or three terminal, when docking, second of the docking section of described constant-current drive circuit, the 5th of the docking section of the 3rd terminal and LED light source plate, the 6th first conducting of terminal, then the 4th terminal conducting again of the first terminal of the docking section of described constant-current drive circuit and described LED light source plate.
9. LED light source lighting circuit as claimed in claim 8, it is characterized in that: described second, between the 3rd terminal, connect an electrochemical capacitor, the positive pole of described electrochemical capacitor is positioned at second terminal one end, described second, after the 3rd terminal electrochemical capacitor in parallel, the negative pole output circuit of electrochemical capacitor is in parallel with constant current drive integrated circult by after current-limiting inductance point of three line conductors, described three line conductors are respectively second, the 3rd, privates, described the second wire is directly communicated with described constant current drive integrated circult, one end of described privates is connected with described the second wire by described switching tube, one end of described privates is connected with described switching tube by one the 5th wire, be connected with described the second wire via described switching tube again, the described the 3rd, the other end of privates connects respectively described constant current drive integrated circult, a fly-wheel diode in parallel between described the second wire and the first wire.
10. LED light source lighting circuit as claimed in claim 8, is characterized in that: the docking section of described LED light source plate the 4th, be connected with described LED light source plate after Five-terminals parallel connection, described the 6th terminal is directly connected with described LED light source plate by another wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210474951.3A CN103841693B (en) | 2012-11-21 | 2012-11-21 | Constant current drive circuit and LED light source lighting circuit with constant current drive circuit |
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|---|---|---|---|
| CN201210474951.3A CN103841693B (en) | 2012-11-21 | 2012-11-21 | Constant current drive circuit and LED light source lighting circuit with constant current drive circuit |
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| CN103841693A true CN103841693A (en) | 2014-06-04 |
| CN103841693B CN103841693B (en) | 2017-02-15 |
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| CN102155645A (en) * | 2010-12-07 | 2011-08-17 | 刘昌贵 | LED (light emitting diode) fluorescent lamp and fluorescent lamp connecting circuit |
| CN102169154A (en) * | 2011-01-13 | 2011-08-31 | 深圳创维－Rgb电子有限公司 | A method and a device for testing an HDMI |
| CN201967207U (en) * | 2011-01-24 | 2011-09-07 | 广州南科集成电子有限公司 | High power coefficient constant current LED (light-emitting diode) lighting circuit |
| CN102760403A (en) * | 2011-04-25 | 2012-10-31 | 康佳集团股份有限公司 | Signal interface circuit of LED module and LED display device |
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| CN202979385U (en) * | 2012-11-21 | 2013-06-05 | 欧普照明股份有限公司 | Constant-current drive circuit and LED light source lightening circuit having constant-current drive circuit |
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2012
- 2012-11-21 CN CN201210474951.3A patent/CN103841693B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002343585A (en) * | 2001-05-22 | 2002-11-29 | Meiji Natl Ind Co Ltd | Power supply circuit for led light source |
| CN1863423A (en) * | 2005-05-13 | 2006-11-15 | 夏普株式会社 | LED drive circuit, LED lighting device, and backlight |
| JP2008243619A (en) * | 2007-03-27 | 2008-10-09 | Toshiba Lighting & Technology Corp | Led lighting device |
| JP2009044012A (en) * | 2007-08-09 | 2009-02-26 | Toshiba Lighting & Technology Corp | Led lighting device and led substrate module |
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| CN103841693B (en) | 2017-02-15 |
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