CN103957631B - A kind of LED drive chip, LED drive circuit and LED lamp - Google Patents
A kind of LED drive chip, LED drive circuit and LED lamp Download PDFInfo
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- CN103957631B CN103957631B CN201410168429.1A CN201410168429A CN103957631B CN 103957631 B CN103957631 B CN 103957631B CN 201410168429 A CN201410168429 A CN 201410168429A CN 103957631 B CN103957631 B CN 103957631B
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Abstract
The invention belongs to field of LED illumination, particularly a kind of LED drive chip, LED drive circuit and LED lamp.LED drive chip provided by the present invention connects rectifier bridge and LED group, specifically comprises switch control module, voltage regulator module and load; Wherein, switch control module and LED group are connected to the output of rectifier bridge altogether, the direct-flow input end of the earth terminal of switch control module, the output of switching tube and rectifier bridge is connected to ground altogether, and input and the controlled end of switching tube are connected the output of LED group and the control end of switch control module respectively; The input of voltage regulator module connecting valve pipe and load.Because voltage regulator module being load supplying by adjusting the voltage of input of switching tube, this LED drive circuit being applied in LED lamp, significantly improving the operating efficiency of LED lamp.
Description
Technical field
The invention belongs to field of LED illumination, particularly a kind of LED drive chip, LED drive circuit and LED lamp.
Background technology
LED lamp, with high efficiency, high integration and the advantage of high life, obtains applying more and more widely at lighting field.In LED lamp, due to the requirement to integrated level and manufacturing cost, the share that the AC LED drive scheme of the energy storage devices such as non-inductance electric heating appearance accounts in the market is increasing, inherently becomes main flow in future.This kind of drive scheme is by the break-make of control chip control switch pipe to regulate the quantity of the LED group of real work, thus reaches the object that the electric current of LED group is flow through in restriction.
But, in such LED drive scheme, the power supply of driving chip is through the electric main of rectification mostly, and light-adjusting module, illuminator control module even load also need, by high pressure regulators, high voltage direct current is converted to required low-voltage DC, do the efficiency that not only can reduce system like this, also can increase the extra manufacturing cost of LED lamp, and then limit the application of such drive scheme.
Therefore, there is the low problem of system effectiveness in the LED lamp of existing employing AC LED drive scheme.
Summary of the invention
The object of the present invention is to provide a kind of LED drive chip, there is the low problem of system effectiveness in the LED lamp being intended to solve existing employing AC LED drive scheme.
The present invention is achieved in that a kind of LED drive chip, and connect rectifier bridge and the first LED group, described LED drive chip comprises switch control module, the first switching tube and load; Described rectifier bridge incoming transport electricity, and after rectification process is carried out to described alternating current, export described switch control module and described first LED group to, the input of described first switching tube connects the output of described first LED group, and described switch control module controls the switching frequency of described first switching tube to adjust the electric current flowing through described first LED group;
Described LED drive chip also comprises the first voltage regulator module;
Power end and the output of described first voltage regulator module are connected the input of described first switching tube and the power end of described load respectively;
Described first voltage regulator module accesses direct current by the output of described first LED group, is described load supplying to described direct current after doing voltage transformation process.
Another object of the present invention is also to provide a kind of LED drive circuit, comprises rectifier bridge, also comprises above-mentioned LED drive chip.
Another object of the present invention is also to provide a kind of LED lamp, comprises housing, also comprises above-mentioned LED drive circuit.
LED drive chip provided by the present invention connects rectifier bridge and the first LED group, specifically comprises switch control module, the first voltage regulator module, load and the first voltage regulator module; Wherein, rectifier bridge incoming transport electricity, and after rectification process is carried out to alternating current, export switch control module and the first LED group to, the input of the first switching tube connects the output of the first LED group, and switch control module controls the switching frequency of the first switching tube to adjust the electric current flowing through the first LED group; Power end and the output of the first voltage regulator module are connected the input of the first switching tube and the power end of load respectively; First voltage regulator module accesses direct current by the output of the first LED group, is load supplying after doing voltage transformation process.Because the first voltage regulator module is load supplying by the voltage of the output of adjustment first LED group, it has higher efficiency relative to the direct voltage adjustment exported rectifier bridge.This LED drive circuit is applied in LED lamp, significantly improves the operating efficiency of LED lamp.
Accompanying drawing explanation
Fig. 1 is the function structure chart of the first embodiment of LED drive chip provided by the present invention;
Fig. 2 is the exemplary circuit structure chart of the first voltage regulator module of the first embodiment of LED drive chip provided by the present invention;
Fig. 3 is the function structure chart of the second embodiment of LED drive chip provided by the present invention;
Fig. 4 is the comparison diagram of the voltage change curve that the voltage change curve of the rectification bridge output end of the second embodiment of LED drive chip provided by the present invention and switching tube drain.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
LED drive chip provided by the present invention connects rectifier bridge and the first LED group, specifically comprises switch control module, the first voltage regulator module and load; There is the low problem of system effectiveness in the LED lamp solving existing employing AC LED drive scheme.
embodiment 1
Fig. 1 shows the modular structure of LED drive chip provided by the present invention, and for convenience of explanation, illustrate only part related to the present invention, details are as follows:
The LED drive chip that the present embodiment provides connects rectifier bridge 10 and the first LED group 30, can comprise switch control module 20, first switching tube 40 and load 60.
Concrete, the power end of switch control module 20 and the input of the first LED group 30 are connected to the output of rectifier bridge 10 altogether, the earth terminal of switch control module 20, the output of the first switching tube 40 and the direct-flow input end of rectifier bridge 10 are connected to ground altogether, and input and the controlled end of the first switching tube 40 are connected the output of the first LED group 30 and the first control end of switch control module 20 respectively.
Wherein, the ac input end incoming transport civil power of rectifier bridge 10, switch control module 20 controls the switching frequency of the first switching tube 40 to adjust the electric current flowing through the first LED group 30.
Further, LED drive chip also comprises the first voltage regulator module 50;
Power end and the output of the first voltage regulator module 50 are connected the input of the first switching tube 40 and the power end of load 60 respectively.
First voltage regulator module 50 accesses direct current by the output of the first LED group 30, for load 60 powers after doing voltage transformation process to direct current.
Because the first voltage regulator module 50 is that load 60 is powered by the voltage of the output of adjustment first LED group 30, its mode adjusted relative to the direct voltage exported rectifier bridge 10 has higher efficiency.
Further, the first enable signal output of the Enable Pin connecting valve control module 20 of the first voltage regulator module 50.Technical staff can control unlatching and the shutoff of the first voltage regulator module 50 by switch control module 20.
In the present embodiment, as shown in Figure 2, the first voltage regulator module 50 can comprise:
N-type JFET pipe Q1, the first NMOS tube Q2, the second NMOS tube Q3, the 3rd NMOS tube Q4, the first resistance R1, the second resistance R2, the 3rd resistance R3, electric capacity C1 and voltage-stabiliser tube D1;
The drain electrode of N-type JFET pipe Q1 is the input of described first voltage regulator module, the first end of the first resistance R1 and the first end of the second resistance R2 are connected to the source electrode of N-type JFET pipe Q1 altogether, the grid of the first NMOS tube Q2 is the Enable Pin of the first voltage regulator module, the drain electrode of the first NMOS tube Q2, the grid of the second NMOS tube Q3, the drain electrode of the second NMOS tube Q3, second end of the first resistance R1 and the first end of electric capacity C1 are connected to the controlled end of the 3rd NMOS tube Q4 altogether, second end of the second resistance R2 connects the drain electrode of the 3rd NMOS tube Q4, the source electrode of the second NMOS tube Q3 connects the first end of the 3rd resistance R3, second end of the 3rd resistance R3 connects the negative electrode of voltage-stabiliser tube D1, the source electrode of the 3rd NMOS tube Q4 is the output of the first voltage regulator module, the grid of N-type JFET pipe Q1, the source electrode of the first NMOS tube Q2, the substrate of the first NMOS tube Q2, the substrate of the second NMOS tube Q3, the substrate of the 3rd NMOS tube Q4 and the anode of voltage-stabiliser tube D1 are connected to ground altogether.
In the present embodiment, switch control module 20 can be that model is the singlechip chip of 80C51 and has Voltage stabilizing module, also can be that other can export the signal source of square-wave signal.Rectifier bridge 10 can adopt existing rectification chip, and model can be MB6S.First switching tube 40 can adopt NMOS tube, and wherein, the drain electrode of NMOS tube, source electrode and grid are the input of the first switching tube 40, output and controlled end respectively.First switching tube 40 also can adopt JFET pipe, triode etc.
Further, LED drive chip also comprises the first drainage module 70 be serially connected with between the first voltage regulator module 50 and load 60;
Input and the output of the first drainage module 70 are connected the output of the first voltage regulator module 50 and the power end of load 60 respectively.
In the present embodiment, by setting up the first drainage module 70, making the electric current one-way flow that the first voltage regulator module 50 exports, also avoiding load 60 because of failure and other reasons damage front-end module simultaneously.
Concrete, the first drainage module 70 can adopt diode, and the anode of diode and negative electrode are input and the output of the first drainage module 70 respectively.First drainage module 70 also can be the network that triode and resistance are formed, and its structure belongs to prior art, does not repeat them here.
embodiment 2
The enforcement of the present embodiment is based upon on the basis of an embodiment.
Fig. 3 shows the modular structure of the LED drive chip that the present embodiment provides, and for convenience of explanation, illustrate only part related to the present embodiment, details are as follows:
In the present embodiment, LED drive chip is also connected with one or more second LED group 31, and LED drive chip also comprises one or more second switch pipe 41, and switch control module 20 also has one or more second control end.
Further, the quantity of the quantity of one or more second switch pipe 41, the quantity of one or more second switch pipe 41 and one or more second control end is equal.
Concrete, one or more second LED group 31 is by the output of the first LED group 30, and the mode adopting input to connect output is sequentially connected in series.
The controlled end of each the second switch pipe 41 in one or more second switch pipe 41 connects each second control end in one or more second control end correspondingly.
The input of each second switch pipe 41 connects the output of each the second LED group 31 in one or more second LED group 31 correspondingly;
The output of each second switch pipe 41 is connected to the earth terminal of switch control module 20 altogether.
In the present embodiment, this LED drive chip is actually the expansion to the LED drive chip that embodiment 1 provides, and it has multiple LED group, more powerful, has the larger scope of application.Meanwhile, the LED drive chip that itself and embodiment provide is the same has the first voltage regulator module 50, and a road power supply can be provided to export, and is that the first assistant load is powered.
Further, LED drive chip can also comprise one or more second voltage regulator module 51.
Further, the quantity of one or more second voltage regulator module 51 is equal with one or more second switch pipe 41.
Concrete, the power end of each the second voltage regulator module 51 in one or more second voltage regulator module 51 connects the input of each second switch pipe 41 correspondingly, and the output of each the second voltage regulator module 51 connects the power end of load 70.
In the present embodiment, this LED drive chip, by increasing the quantity of voltage regulator module, increases multiple power supplies and exports, the need for electricity of proof load 70.
Further, switch control module 20 also has one or more second enable signal output;
The quantity of one or more second enable signal output is equal with the quantity of one or more second voltage regulator module 51;
The Enable Pin of each second voltage regulator module 51 connects each the second enable signal output in one or more second enable signal output correspondingly.
In the present embodiment, technical staff can control unlatching and the shutoff of the first voltage regulator module 50, second voltage regulator module 51 by switch control module 20, thus selects an optimal voltage regulator module of output voltage to be that load 70 is powered.
Further, LED drive chip can also comprise one or more second drainage module 71;
The quantity of one or more second drainage module 71 is equal with the quantity of one or more second voltage regulator module 51;
Each second drainage module 71 in one or more second drainage module 71 is serially connected with between each the second voltage regulator module 51 and load 60 correspondingly;
The input of each the second drainage module 71 connects the output of each the second voltage regulator module 51 correspondingly, and the output of each the second drainage module 71 is connected to the power end of load 60 altogether.
In the present embodiment, the second drainage module 71 can adopt the structure identical with the first drainage module 70, and its function is also identical with the first drainage module 70.
Below in conjunction with Fig. 4, the operation principle of LED drive chip provided by the present invention is described further:
Comprise 4 NMOS tube for LED drive chip and 4 groups of LED groups of arranging in pairs or groups, 4 NMOS tube are designated as the first NMOS tube, the second NMOS tube, the 3rd NMOS tube and the 4th NMOS tube.The electric main accessed is received in switch control module 20 and LED group after rectifier bridge 10.As shown in Figure 4.Wherein, curve a is the rectifier bridge 10 voltage change curve Vin of the accessed one-period of electric main after rectification, curve b is the switching tube drain voltage conversion curve Vdr of electric current in NMOS tube flowing through LED group.4 NMOS tube can open according to the logic of switch control module, turn off, and ensure in one-period, make only have a voltage regulator module in running order by enable control.This part belongs to prior art, does not repeat its concrete principle.
For curve b, interval tr1 and interval tf1 represents the waveform of the first NMOS tube drain electrode, interval tr2 and interval tf2 represents the waveform of the second NMOS tube drain electrode, and interval tr3 and interval tf3 represents the waveform of the 3rd NMOS tube drain electrode, and interval tr4 and interval tf4 represents the waveform of the 4th NMOS tube drain electrode.According to the model of selected LED group and NMOS tube, the drain electrode of the NMOS tube after powering on can provide the voltage of 0-60V, and effective voltage is about 30V.
The drain electrode of NMOS tube is connected with the power end of voltage adjuster, and the voltage in its drain electrode obtains another voltage after voltage adjuster conversion.Like this without high voltage source conversion, required low voltage can be obtained.For System on Chip/SoC or other module.
Suppose the low-tension supply needing 5V, then the conversion efficiency of traditional scheme to accessed electric main is: η 1 ≈ 5/220=2.27%; Adopt the conversion efficiency of this application scheme to be then: η 2 ≈ 5/30=16.67%, can find out that this programme obviously improves the efficiency of system.
Another object of the present invention is also to provide a kind of LED drive circuit, comprises rectifier bridge, also comprises above-mentioned LED drive chip.
Another object of the present invention is also to provide a kind of LED lamp, comprises housing, also comprises LED drive circuit described above.
In the present embodiment, because above-mentioned LED drive circuit includes above-mentioned LED drive chip, and the voltage that the voltage regulator module in above-mentioned LED drive chip is input by adjusting the first switching tube is load supplying, its mode adjusted relative to the direct voltage exported rectifier bridge has higher efficiency.This LED drive circuit is applied in LED lamp, significantly improves the operating efficiency of LED lamp.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a LED drive chip, connect rectifier bridge and the first LED group, described LED drive chip comprises switch control module, the first switching tube and load; Described rectifier bridge incoming transport electricity, and after rectification process is carried out to described alternating current, export described switch control module and described first LED group to, the input of described first switching tube connects the output of described first LED group, and described switch control module controls the switching frequency of described first switching tube to adjust the electric current flowing through described first LED group; It is characterized in that:
Described LED drive chip also comprises the first voltage regulator module;
Power end and the output of described first voltage regulator module are connected the input of described first switching tube and the power end of described load respectively;
Described first voltage regulator module accesses direct current by the output of described first LED group, is described load supplying to described direct current after doing voltage transformation process.
2. LED drive chip as claimed in claim 1, it is characterized in that, described LED drive chip is also connected with one or more second LED group, and described LED drive chip also comprises one or more second switch pipe, and described switch control module also has one or more second control end;
The quantity of the quantity of described one or more second LED group, the quantity of described one or more second switch pipe and described one or more second control end is equal;
Described one or more second LED group is by the output of described first LED group, and the mode adopting input to connect output is sequentially connected in series;
The controlled end of each the second switch pipe in described one or more second switch pipe connects each second control end in described one or more second control end correspondingly;
The input of each second switch pipe described connects the output of each the second LED group in described one or more second LED group correspondingly;
The output of each second switch pipe described is connected to the earth terminal of described switch control module altogether.
3. LED drive chip as claimed in claim 2, it is characterized in that, described LED drive chip also comprises one or more second voltage regulator module;
The quantity of described one or more second voltage regulator module is equal with the quantity of described one or more second switch pipe;
The power end of each the second voltage regulator module in described one or more second voltage regulator module connects the input of each second switch pipe described correspondingly, and the output of each the second voltage regulator module described connects the power end of described load.
4. LED drive chip as claimed in claim 1, it is characterized in that, described LED drive chip also comprises the first drainage module be serially connected with between described first voltage regulator module and described load;
Input and the output of described first drainage module are connected the output of described first voltage regulator module and the power end of described load respectively.
5. LED drive chip as claimed in claim 3, it is characterized in that, described LED drive chip also comprises one or more second drainage module;
The quantity of described one or more second drainage module is equal with the quantity of described one or more second voltage regulator module;
Each second drainage module in described one or more second drainage module is serially connected with described between each the second voltage regulator module and described load correspondingly;
The input of each the second drainage module described connects the output of each the second voltage regulator module described correspondingly, and the output of each the second drainage module described is connected to the power end of described load altogether.
6. LED drive chip as claimed in claim 1, it is characterized in that, the Enable Pin of described first voltage regulator module connects the first enable signal output of described switch control module.
7. LED drive chip as claimed in claim 6, it is characterized in that, described first voltage regulator module comprises:
N-type JFET pipe, the first NMOS tube, the second NMOS tube, the 3rd NMOS tube, the first resistance, the second resistance, the 3rd resistance, electric capacity and voltage-stabiliser tube;
The drain electrode of described N-type JFET pipe is the input of described first voltage regulator module, the first end of described first resistance and the first end of described second resistance are connected to the source electrode of described N-type JFET pipe altogether, the grid of described first NMOS tube is the Enable Pin of described first voltage regulator module, the drain electrode of described first NMOS tube, the grid of described second NMOS tube, the drain electrode of described second NMOS tube, second end of described first resistance and the first end of described electric capacity are connected to the controlled end of described 3rd NMOS tube altogether, second end of described second resistance connects the drain electrode of described 3rd NMOS tube, the source electrode of described second NMOS tube connects the first end of described 3rd resistance, second end of described 3rd resistance connects the negative electrode of described voltage-stabiliser tube, the source electrode of described 3rd NMOS tube is the output of described first voltage regulator module, the grid of described N-type JFET pipe, the source electrode of described first NMOS tube, the substrate of described first NMOS tube, the substrate of described second NMOS tube, the described substrate of the 3rd NMOS tube and the anode of described voltage-stabiliser tube are connected to ground altogether.
8. LED drive chip as claimed in claim 3, it is characterized in that, described switch control module also has one or more second enable signal output;
The quantity of described one or more second enable signal output is equal with the quantity of described one or more second voltage regulator module;
The Enable Pin of each the second voltage regulator module described connects each the second enable signal output in described one or more second enable signal output correspondingly.
9. a LED drive circuit, comprises rectifier bridge, it is characterized in that, described LED drive circuit also comprises the LED drive chip as described in any one of claim 1 to 8.
10. a LED lamp, comprises housing, also comprises LED drive circuit as claimed in claim 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410168429.1A CN103957631B (en) | 2014-04-23 | 2014-04-23 | A kind of LED drive chip, LED drive circuit and LED lamp |
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| CN201410168429.1A CN103957631B (en) | 2014-04-23 | 2014-04-23 | A kind of LED drive chip, LED drive circuit and LED lamp |
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| CN103957631A CN103957631A (en) | 2014-07-30 |
| CN103957631B true CN103957631B (en) | 2016-03-30 |
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| CN105120566B (en) * | 2015-09-07 | 2018-03-06 | 深圳市晟碟半导体有限公司 | The constant current driving device and its driving method of automatic equalization LED cross luma degree |
| CN113453405B (en) * | 2021-07-16 | 2023-01-13 | 芯知微(上海)电子科技有限公司 | LED drive circuit and LED lamp |
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| US9131571B2 (en) * | 2012-09-14 | 2015-09-08 | Cree, Inc. | Solid-state lighting apparatus and methods using energy storage with segment control |
| CN202818729U (en) * | 2012-09-26 | 2013-03-20 | 深圳市晟碟半导体有限公司 | LED driving device |
| CN203378116U (en) * | 2013-07-31 | 2014-01-01 | 深圳市晟碟半导体有限公司 | Dynamically configured segmentation LED (light emitting diode) driving device and LED lighting device |
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