CN105430810A - LED lighting driving system - Google Patents
LED lighting driving system Download PDFInfo
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- CN105430810A CN105430810A CN201510999630.9A CN201510999630A CN105430810A CN 105430810 A CN105430810 A CN 105430810A CN 201510999630 A CN201510999630 A CN 201510999630A CN 105430810 A CN105430810 A CN 105430810A
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- constant current
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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]
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Abstract
The invention provides an LED lighting driving system, and belongs to the technical field of semiconductors. The LED lighting driving system comprises a transformer and a driving chip. The transformer comprises a first AC input end, a second AC input end, a first AC output end and a second AC output end. The driving chip comprises a first constant current device, a second constant current device, a third constant current device and a fourth constant current device. The anode of the first constant current device is connected with the cathode of the fourth constant current device so as to form a first node. The cathode of the first constant current device is connected with the cathode of the second constant current device so as to form a second node. The anode of the second constant current device is connected with the cathode of the third constant current device so as to form a third constant current device. The anode of the third constant current device is connected with the anode of the fourth constant current device so as to form a fourth node. The first AC output end is connected with the first node. The second AC output end is connected with the third node. The structure of the conventional LED lighting driving system is simplified, power consumption of the driving system is reduced and reliability is system is enhanced.
Description
Technical field
The invention belongs to technical field of semiconductors, be specifically related to a kind of LED illumination drive system.
Background technology
Traditional LED illumination driving generally adds (or multiple) constant current chip by rectifier bridge or constant current device forms, constant current device is generally a kind of constant current device of similar JFET structure, there is the feature of two-way admittance, namely the effect of constant current can be reached when forward works, be similar to the conduction mode of general-purpose diode when reverse operation, there is higher electric current.During work, AC alternating current input rectifying bridge, then capacitor filtering converts direct current to after filtering, then connect constant current chip or constant current device (such as current regulator diode), reach the effect of constant current output, thus driving LED lamp string.
(the Averticalcurrentregulatordiodewithtrenchcathodebasedondo ubleepitaxiallayersforLEDlighting such as YitaoHe, YitaoHe, PowerSemiconductorDevices & IC's (ISPSD), 2015IEEE27thInternationalSymposiumon, Page (s): 157 – 160, 10-14May2015) propose a kind of LED illumination drive system, as shown in Figure 1, this LED illumination drive system comprises rectification filtering module and constant current chip two parts, rectification filtering module is made up of rectifier bridge and a filter capacitor, constant current chip is any two end constant current devices.This LED illumination drive system comprises rectification and constant current two parts, and structure is more complicated.
Summary of the invention
The present invention proposes a kind of LED illumination drive system.Rectification function and constant current function combine by this drive system, make the driving of LED more simple and reliable, can realize the miniaturization of drive system, and reduce further cost; Utilize transformer that input AC electricity is converted to suitable voltage simultaneously, thus the power consumption of system is reduced further, improve the efficiency of drive system.
Technical scheme of the present invention is as follows:
A kind of LED illumination drive system, comprises transformer T1 and driving chip T2 two parts; Described transformer T1 comprises two ac input ends and two outputs, is respectively the first ac input end AC1, the second ac input end AC2 and the first ac output end M1 and the second ac output end M2; Described driving chip T2 comprises 4 and has oppositely by the constant current device of characteristic: the first constant current device D1, the second constant current device D2, the 3rd constant current device D3, the 4th constant current device D4; The anode of described first constant current device D1 is connected with the negative electrode of the 4th constant current device D4 and forms first node A, the negative electrode of described first constant current device D1 is connected with the negative electrode of the second constant current device D2 and forms Section Point B, be connected with the negative electrode of the 3rd constant current device D3 anode of formation the 3rd node C, described 3rd constant current device D3 of the anode of described second constant current device D2 is connected with the anode of the 4th constant current device D4 formation the 4th node D; The first ac output end M1 of described transformer T1 is connected with the first node A of driving chip T2, and the second ac output end M2 of described transformer T1 is connected with the 3rd node C of driving chip T2.
Further, described LED illumination drive system comprises 4 ports, is respectively the first ac input end AC1, the second ac input end AC2, the first DC output end OUT1, the second DC output end OUT2; Described first DC output end OUT1 connects the inner Section Point B of driving chip T2, and described second DC output end OUT2 connects the inner 4th node D of driving chip T2.
Further, described constant current device is that n constant current device units in series obtains.
Further, the feature of described constant current device is: when forward voltage is greater than pinch-off voltage, its constant current hold; When applying reverse voltage, device keeps turning off, and is in by state, and has higher withstand voltage.
Further, described first constant current device D1, the second constant current device D2, the 3rd constant current device D3, the 4th constant current device D4 are two identical end constant current devices.
Further, described first constant current device D1, the second constant current device D2, the 3rd constant current device D3, the 4th constant current device D4 are two different end constant current devices.
Further, described transformer T1 can be adjustable transformer also can be common transformer.
Further, described transformer T1 accessible site in driving chip T2, thus reduces the area of lighting driving system.
Beneficial effect of the present invention is:
1, the LED illumination drive system that the present invention is made up of transformer and constant current device simplifies the structure of traditional LED illumination drive system, can carry out driving LED lamp string by direct external civil power without the need to adding other discrete constant current device; By the adjustment of transformer to driving chip input terminal voltage, the design difficulty of driving chip can be reduced, improve reliability.
2, the present invention is boosted by the input of transformer T1 to driving chip T2 or step-down adapts to different applied environments, adopts square wave current signal driving LED lamp string; Compared to holocyclic constant current driving system, the efficiency of LED illumination drive system of the present invention, chip cooling performance and chip reliability all get a promotion, and power consumption reduces further.
3, when the LED number that LED illumination drive system of the present invention drives remains unchanged, by the duty ratio of adjustable transformer regulation output electric current, thus regulate the light levels of LED, make user have good use sense and be subject to.
4, the driving chip T2 that the present invention adopts improves system reliability, and utilizes existing production line and encapsulating mould, without the need to opening new die again, reduces production cost.
5, driving chip of the present invention is when normally working, and has in two constant current device places in circuit simultaneously, and the voltage range of maintenance constant current output is greatly improved, and the output current of chip is more reliable and more stable than conventional constant current device.
Accompanying drawing explanation;
Fig. 1 is the structural representation of a kind of LED illumination drive system described in background technology;
Fig. 2 is the structural representation of LED illumination drive system provided by the invention;
Fig. 3 is the IV curve chart of constant current device of the present invention (D1, D2, D3, D4);
The application schematic diagram of the LED illumination drive system that Fig. 4 provides for the embodiment of the present invention;
The structural representation of the constant current device of Fig. 5 used by the embodiment of the present invention;
The simulation architecture figure of the constant current device of Fig. 6 used by the embodiment of the present invention;
The input voltage of the LED illumination drive system that Fig. 7 provides for the embodiment of the present invention and output current simulation curve;
Fig. 8 is the structural representation of the LED illumination drive system of another embodiment of the present invention.
Embodiment
Below in conjunction with drawings and Examples in detail, technical scheme of the present invention is described in detail.
A kind of LED illumination drive system, as shown in Figure 2, comprises transformer T1 and driving chip T2 two parts; Described transformer T1 comprises two ac input ends and two outputs, is respectively: the first ac input end AC1, the second ac input end AC2 and the first ac output end M1 and the second ac output end M2; Described driving chip T2 comprises 4 to be had oppositely by the constant current device of characteristic, is respectively: the first constant current device D1, the second constant current device D2, the 3rd constant current device D3, the 4th constant current device D4; The anode of described first constant current device D1 is connected with the negative electrode of the 4th constant current device D4 and forms first node A, the negative electrode of described first constant current device D1 is connected with the negative electrode of the second constant current device D2 and forms Section Point B, be connected with the negative electrode of the 3rd constant current device D3 anode of formation the 3rd node C, described 3rd constant current device D3 of the anode of described second constant current device D2 is connected with the anode of the 4th constant current device D4 formation the 4th node D; The first ac output end M1 of described transformer T1 is connected with the first node A of driving chip T2, and the second ac output end M2 of described transformer T1 is connected with the 3rd node C of driving chip T2.
Further, described LED illumination drive system comprises 4 ports, is respectively the first ac input end AC1, the second ac input end AC2, the first DC output end OUT1, the second DC output end OUT2; Described first DC output end OUT1 connects the inner Section Point B of driving chip T2, and described second DC output end OUT2 connects the inner 4th node D of driving chip T2.
Further, described constant current device is that n constant current device units in series obtains.
Further, the feature of described first constant current device D1, the second constant current device D2, the 3rd constant current device D3, the 4th constant current device D4 is: when forward voltage is greater than pinch-off voltage, its constant current hold; When applying reverse voltage, device keeps turning off by state, and has higher withstand voltage; Its IV curve chart as shown in Figure 3.
Further, described first constant current device D1, the second constant current device D2, the 3rd constant current device D3, the 4th constant current device D4 are two identical end constant current devices.
Further, described first constant current device D1, the second constant current device D2, the 3rd constant current device D3, the 4th constant current device D4 are two different end constant current devices.
Further, described transformer T1 can be adjustable transformer also can be common transformer.
Further, described transformer T1 also can be integrated in driving chip T2, thus reduces lighting driving system area.
Operation principle of the present invention is:
As shown in Figure 4, first ac input end AC1 and the second ac input end AC2 connects civil power 220V alternating current two ends respectively, first DC output end OUT1 and the second DC output end OUT2 connects the two ends of LED string respectively, civil power export after transformer T1 transformation be the first ac output end M1 and the second ac output end M2, transformer T1 output as the input of next stage driving chip T2.When the first ac output end M1 voltage is greater than the second ac output end M2 voltage and its difference is greater than the cut-in voltage of LED string, because the 4th constant current device D4 and the second constant current device D2 keeps by state when voltage reversal, therefore the path that electric current flows through is the first ac output end M1 → first node A → the first constant current device D1 → Section Point B → the first DC output end OUT1 → LED string input → LED string output → the second DC output end OUT2 → the 4th node D → the 3rd constant current device D3 → the 3rd node C → the second ac output end M2, because the first constant current device D1 and the 3rd constant current device D3 has the ability of constant current when forward, therefore the constant current hold on whole current path.With should the second ac output end M2 voltage be greater than the first ac output end M1 voltage and its difference is greater than the cut-in voltage of LED string time, the path that electric current flows through is the second ac output end M2 → the 3rd node C → the second constant current device D2 → Section Point B → the first DC output end OUT1 → LED string input → LED string output → the second DC output end OUT2 → the 4th node D → the 4th constant current device D4 → first node A → the first ac output end M1.In described operation principle, the electric current just having constant magnitude when only having the absolute value of the voltage difference between the first ac output end M1 and the second ac output end M2 to be greater than the cut-in voltage sum of the operating voltage of lamp string and constant current device flows through, it can thus be appreciated that the output current of drive system is square-wave signal, different transformers can be selected to adjust the output voltage size of transformer T1 for different application, thus the duty ratio of regulation output electric current, or use adjustable transformer to adjust the duty ratio of output current, thus regulate the luminous intensity of LED.Described LED illumination drive system also can increase afterflow device between the first DC output end OUT1, the second DC output end OUT2, and drive system so just can be made to keep complete period constant current output, and at this moment LED string will remain on maximum brightness always.
Embodiment
In the present embodiment, transformer T1 transformation ratio is 220:110.First constant current device D1, second constant current device D2, 3rd constant current device D3, 4th constant current device D4 is identical constant current device, the structural representation of described constant current device as shown in Figure 5, comprise P type light dope substrate 2, be positioned at the N-type light dope epitaxial loayer 3 on P type light dope substrate 2, be positioned at the diffusion P type trap zone 4 among N-type light dope epitaxial loayer 3, described diffusion P type trap zone 4 is two and is positioned at two ends, be positioned at the P type heavily doped region 5 among diffusion P type trap zone 4 and N-type heavily doped region 7, the deplection type channel district 6 of diffusion P type trap zone 4 upper surface is embedded between N-type heavily doped region 7 and N-type light dope epitaxial loayer 3, be positioned at the oxide layer 10 of N-type light dope epitaxial loayer 3 and deplection type channel district 6 upper surface, cover the metallic cathode 9 of whole upper surface, be positioned at the metal anode 8 of P type light dope substrate 2 lower surface, described P type heavily doped region 5, N-type heavily doped region 7 and metallic cathode 9 form ohmic contact.Simulation architecture as shown in Figure 6.
As shown in Figure 4, during use, described first ac input end AC1 and the second ac input end AC2 connects the two ends of civil power 220V alternating current respectively, and the first DC output end OUT1 and the second DC output end OUT2 connects the two ends of LED string respectively.
The input voltage of the LED illumination drive system that Fig. 7 provides for the embodiment of the present invention and output current simulation curve.The input voltage of LED illumination drive system of the present invention is the alternating current of civil power 220V, transformer T1 output is 110V alternating current, when LED string cut-in voltage is 110V, variation relation is as shown in Figure 7 in time for the input voltage of LED illumination drive system of the present invention and output current, the square-wave signal of the output of electric current to be duty ratio be 1:1, the frequency of output current is 100Hz, can throw light on by driven LED string, and be conducive to the heat radiation of drive system and LED string, the reliability of system and efficiency are all got a promotion.
As shown in Figure 8, be the structural representation of the LED illumination drive system of another embodiment provided by the invention, comprise transformer T1 and driving chip T2 two parts; Described transformer T1 comprises two ac input ends and two outputs, is respectively: the first ac input end AC1, the second ac input end AC2 and the first ac output end M1 and the second ac output end M2; Described driving chip T2 comprises 4 to be had oppositely by the constant current device of characteristic, is respectively: the first constant current device D1, the second constant current device D2, the 3rd constant current device D3, the 4th constant current device D4; The anode of described first constant current device D1 is connected with the negative electrode of the 4th constant current device D4 and forms first node A, the negative electrode of described first constant current device D1 is connected with the negative electrode of the second constant current device D2 and forms Section Point B, be connected with the negative electrode of the 3rd constant current device D3 anode of formation the 3rd node C, described 3rd constant current device D3 of the anode of described second constant current device D2 is connected with the anode of the 4th constant current device D4 formation the 4th node D; The first ac output end M1 of described transformer T1 is connected with the first node A of driving chip T2, the second ac output end M2 of described transformer T1 is connected with the 3rd node C of driving chip T2, the first DC output end OUT1 of described driving chip T2 is connected with the Section Point B of driving chip T2, and the second DC output end OUT2 of described driving chip T2 is connected with the 4th node D of driving chip T2; Described first constant current device D1 is obtained by 2 constant current device units in series, second constant current device D2 is obtained by 2 constant current device units in series, 3rd constant current device D3 is obtained by 2 constant current device units in series, and the 4th constant current device D4 is obtained by 2 constant current device units in series.
Claims (7)
1. a LED illumination drive system, comprises transformer (T1) and driving chip (T2) two parts; Described transformer (T1) comprises two ac input ends and two outputs, is respectively the first ac input end (AC1), the second ac input end (AC2) and the first ac output end (M1), the second ac output end (M2); Described driving chip (T2) comprises 4 and has oppositely by the constant current device of characteristic: the first constant current device (D1), the second constant current device (D2), the 3rd constant current device (D3), the 4th constant current device (D4); The anode of described first constant current device (D1) is connected with the negative electrode of the 4th constant current device (D4) and forms first node (A), the negative electrode of described first constant current device (D1) is connected with the negative electrode of the second constant current device (D2) and forms Section Point (B), the anode of described second constant current device (D2) is connected with the negative electrode of the 3rd constant current device (D3) formation the 3rd node (C), and the anode of described 3rd constant current device (D3) is connected with the anode of the 4th constant current device (D4) formation the 4th node (D); First ac output end (M1) of described transformer (T1) is connected with the first node (A) of driving chip (T2), second ac output end (M2) of described transformer (T1) is connected with the 3rd node (C) of driving chip (T2), first DC output end (OUT1) of described driving chip (T2) is connected with the Section Point (B) of driving chip (T2), and second DC output end (OUT2) of described driving chip (T2) is connected with the 4th node (D) of driving chip (T2).
2. LED illumination drive system according to claim 1, is characterized in that, described constant current device is that n constant current device units in series obtains.
3. LED illumination drive system according to claim 1, is characterized in that, the feature of described constant current device is: when forward voltage is greater than pinch-off voltage, its constant current hold; When applying reverse voltage, device keeps turning off, and is in by state, and has higher withstand voltage.
4. LED illumination drive system according to claim 1, it is characterized in that, described first constant current device (D1), the second constant current device (D2), the 3rd constant current device (D3), the 4th constant current device (D4) are two identical end constant current devices.
5. LED illumination drive system according to claim 1, it is characterized in that, described first constant current device (D1), the second constant current device (D2), the 3rd constant current device (D3), the 4th constant current device (D4) are two different end constant current devices.
6. LED illumination drive system according to claim 1, is characterized in that, described transformer (T1) is adjustable transformer or common transformer.
7. LED illumination drive system according to claim 1, is characterized in that, described transformer (T1) accessible site is in driving chip (T2).
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| CN201510999630.9A CN105430810A (en) | 2015-12-25 | 2015-12-25 | LED lighting driving system |
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| CN201510999630.9A CN105430810A (en) | 2015-12-25 | 2015-12-25 | LED lighting driving system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106900111A (en) * | 2017-03-01 | 2017-06-27 | 深圳盈特创智能科技有限公司 | A kind of LED light adjusting system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20120056608A1 (en) * | 2010-09-08 | 2012-03-08 | Johnny Siu | Stabilizing network for electronic transformer driven led devices |
| CN103190002A (en) * | 2010-10-28 | 2013-07-03 | 西铁城控股株式会社 | Led lighting circuit, led illuminating device, and socket for led illuminating unit |
| CN105072765A (en) * | 2015-08-20 | 2015-11-18 | 电子科技大学 | Bridge type LED constant-current drive chip |
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2015
- 2015-12-25 CN CN201510999630.9A patent/CN105430810A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120056608A1 (en) * | 2010-09-08 | 2012-03-08 | Johnny Siu | Stabilizing network for electronic transformer driven led devices |
| CN103190002A (en) * | 2010-10-28 | 2013-07-03 | 西铁城控股株式会社 | Led lighting circuit, led illuminating device, and socket for led illuminating unit |
| CN105072765A (en) * | 2015-08-20 | 2015-11-18 | 电子科技大学 | Bridge type LED constant-current drive chip |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106900111A (en) * | 2017-03-01 | 2017-06-27 | 深圳盈特创智能科技有限公司 | A kind of LED light adjusting system |
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Application publication date: 20160323 |