CN202617434U - A multi-switch constant-current driver - Google Patents
A multi-switch constant-current driver Download PDFInfo
- Publication number
- CN202617434U CN202617434U CN 201220221312 CN201220221312U CN202617434U CN 202617434 U CN202617434 U CN 202617434U CN 201220221312 CN201220221312 CN 201220221312 CN 201220221312 U CN201220221312 U CN 201220221312U CN 202617434 U CN202617434 U CN 202617434U
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- current limiting
- led
- rectifier bridge
- constant
- limiting switch
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Abstract
The utility model discloses a multi-switch constant-current driver used for driving a LED string formed by at least one LED module in series. The LED driver comprises a rectifier bridge, a constant current source, and at least one controllable current limiting switch. The input positive end and input negative end of the rectifier bridge are connected with the positive pole and negative pole of an AC power supply, respectively while the output positive end of the rectifier bridge is connected with the positive end of the LED string through the constant current source. The number of the controllable current limiting switches is the same as that of the LED modules. And the controllable current limiting switches have one-to-one correspondence relation with the LED modules. One end of a controllable current limiting switch is connected with the negative pole of a corresponding LED module, while the other ends of all controllable current limiting switches are connected with the output negative end of the rectifier bridge. Such driver prevents a switching power supply in a conventional LED lamp and a low PF problem caused by capacitors and has overlong service life.
Description
Technical field
The utility model belongs to the LED field of light fittings, and particularly a kind of driver of LED string specifically is a kind of LED constant-flow driver that does not need duty cycle adjustment.
Background technology
The LED driving needs a constant electric current and certain voltage, and the most frequently used scheme is to adopt a Switching Power Supply.But because the design of Switching Power Supply itself is comparatively complicated; Need a pwm chip and a power topology, often PF (Power Factor, power factor) is very low for the topology of this single-stage control; The output capacitance of Switching Power Supply often volume is bigger, and price is higher.In the environment of high temperature, the life-span of Switching Power Supply and less stable.
As shown in Figure 1, be a kind of structure chart of existing led driver, wherein; The input of AC/DC supply convertor connects AC power V1, and its output plus terminal is expressed as VO+ and VO-respectively with the output negative terminal, and controlled LED string is an example with 4 LED modules; 4 LED module D1, D2, D3, D4 are along sense of current series aiding connection successively; Each LED module can be single led, also can be at least two LED in series or in parallel with each other, even can be that series and parallel mixes a plurality of LED that connect; The positive and negative end of the output of AC/DC supply convertor connects the positive and negative end of LED string respectively, thereby for LED goes here and there the constant electric current and the voltage of certain limit is provided.
The advantage of driver shown in Figure 1 is that the operating current of LED string is constant; Can not change along with the variation of input ac voltage, but it also has not enough the existence, promptly cost is higher; If adopt the driving of single-stage; PF is difficult to take into account with driving efficient, and the life-span of driver receives the age limit of output capacitance, especially under the environment of high temperature, can cause the life-span of driver shorter.
Therefore, based on the deficiency of existing led driver, the design people studies improvement to existing led driver, and this case produces thus.
The utility model content
The purpose of the utility model is to provide a kind of many switches constant-flow driver, and it can remove the Switching Power Supply in the existing led driver, and can avoid because the PF that electric capacity causes hangs down problem, the useful life that has overlength simultaneously.
In order to reach above-mentioned purpose, the solution of the utility model is:
A kind of many switches constant-flow driver is used to realize the driving of LED string that at least one LED module is connected successively; Said led driver comprises rectifier bridge, a constant-current source and at least one controlled current limiting switch; The positive and negative end of the input of said rectifier bridge connects the positive and negative electrode of AC power respectively, and the output plus terminal of this rectifier bridge connects the anode of LED string via controlled current limiting switch; The number of controlled current limiting switch is identical with the number of LED module; Said controlled current limiting switch is corresponding one by one with the LED module; One end of each controlled current limiting switch connects the negative terminal of its pairing LED module respectively, and the other end of all controlled current limiting switches is connected to the output negative terminal of rectifier bridge jointly.
Above-mentioned LED module is at least two LED single led, in series or in parallel with each other or mixes a plurality of LED that connect.
Above-mentioned rectifier bridge is made up of 4 diodes, and the negative electrode of first diode connects the anode of second diode, and tie point is as the input negative terminal of rectifier bridge; The negative electrode of the 3rd diode connects the anode of the 4th diode, and tie point is as the input anode of rectifier bridge; The anode of first and third diode links to each other, common output plus terminal as rectifier bridge; The second, the negative electrode of four diodes links to each other, common output negative terminal as rectifier bridge.
The controlled current limiting switch that links to each other with above-mentioned LED module detects the voltage at its two ends automatically; The voltage at controlled current limiting switch two ends will rise along with the rising of input voltage when the electric current of the controlled current limiting switch of flowing through exceeds the current value of setting, and it will automatically shut down when the magnitude of voltage at controlled current limiting switch two ends surpasses set point.
The constant-current source circuit of above-mentioned constant-current source for constituting by triode, current regulator diode, MOSFET, IGBT or FET.
The CPU that turns on and off through the periphery of above-mentioned controlled current limiting switch carries out unified control, CPU according to the sequential of opening of each current limiting switch of variation active adjustment of input voltage to realize the optimization of system.
The controlled current limiting switch quantity of above-mentioned LED module, constant-current source and series connection is carried out quantitative increase according to the height situation of input ac voltage or is reduced to reach the optimization of system.
After adopting such scheme, the utlity model has following improvement:
(1) the utility model is through to carrying out the switching controls of a plurality of controlled current limiting switches behind the AC rectification, thereby can remove Switching Power Supply, and can avoid in the available circuit structure because the lower problem of PF that electric capacity causes;
(2) circuit that the utility model provided makes led driver have the useful life of overlength owing to there is not the age limit of aluminium electroloysis.
Description of drawings
Fig. 1 is a kind of circuit diagram of existing led driver;
Fig. 2 is the circuit diagram of the utility model;
Fig. 3 is the another kind of circuit diagram of the utility model.
Embodiment
Below will combine accompanying drawing, the technical scheme of the utility model will be elaborated.
As shown in Figure 2, the utility model provides a kind of many switches constant-flow driver, is used for realizing the driving to the LED string of the individual LED module formation of n (n is a natural number); All LED modules are connected along the sense of current successively, and described LED module can be single led, also can be that at least two LED connect successively; Or at least two LED are parallel with one another; Or even a plurality of LED are by series, parallel mixing connection, because the concrete form of each LED module does not belong to the discussion emphasis of the utility model, therefore in the utility model accompanying drawing; Represent each LED module with single led form; It will be appreciated that single led is a kind of form of expression of LED module, and can not limit the content of LED module with this; In the present embodiment, with 4 successively LED module D5, D6, D7, the D8 of series connection be that example describes, and with the anode of D5 anode as the LED string, with the negative electrode of D8 negative terminal as the LED string, greater number the series LED module can the rest may be inferred.
A kind of many switches constant-flow driver that the utility model provides; Comprise rectifier bridge, n (n is a natural number) individual controlled current limiting switch and a constant-current source; The input anode of said rectifier bridge is connected positive pole and the negative pole of AC power V2 respectively with the input negative terminal; And output plus terminal connects the anode of constant-current source, and the negative terminal of constant-current source connects the anode of LED string; In the present embodiment, rectifier bridge is formed by connecting 4 diode D14, D15, D18, D19, and the negative electrode of diode D18 connects the anode of diode D14; Tie point is as the input negative terminal of rectifier bridge, and the negative electrode of diode D19 connects the anode of diode D15, and tie point is as the input anode of rectifier bridge; And the anode of diode D18, D19 links to each other; Common output negative terminal as rectifier bridge, and the negative electrode of diode D15, D14 links to each other, common output plus terminal as rectifier bridge; The syndeton of aforementioned rectifier bridge is a common practise, repeats no more at this; And constant-current source can adopt the constant-current source circuit that cooperates relevant controlling parts to form by triode, current regulator diode, MOSFET, IGBT or FET.
The number of controlled current limiting switch is identical with the number of controlled LED module; Said each controlled current limiting switch is corresponding one by one with the LED module; One end of each controlled current limiting switch connects the negative terminal of its pairing LED module respectively, and the other end of all controlled current limiting switches is connected to the output negative terminal of rectifier bridge jointly; Cooperate shown in Figure 2ly, the end of 4 controlled current limiting switch S1, S2, S3, S4 connects the negative terminal of LED module D5, D6, D7, D8 respectively, and the other end all is connected to the negative electrode of diode D19, D18.
During current limiting switch work; Based on the self-characteristic of controlled current limiting switch, can regulate the voltage at its two ends automatically according to its electric current that flows through, thereby satisfy the demand of LED string; When the voltage at current limiting switch two ends was lower than the magnitude of voltage of setting, controlled current limiting switch was operated in opening state; And when the voltage at current limiting switch two ends exceeded the magnitude of voltage of setting, first current limliting was closed and is automatically shut down, and second current limiting switch will be open-minded automatically; The switch of its back, thus realize that current limiting switch to its pairing LED module is logical and close.
As shown in Figure 3; The SECO that turns on and off of the controlled current limiting switch in the utility model can be regulated through outside CPU (being the U1 among Fig. 3); CPU is through R1 and the R2 detection to input voltage, and the state that turns on and off that CPU will carry out each controlled current limiting switch according to specific algorithm is with the highest system effectiveness of realization.Other circuit functions of this utility model are no longer tired out and are stated with aforementioned identical.
Above embodiment is merely the technological thought of explanation the utility model; Can not limit the protection range of the utility model with this; Every technological thought that proposes according to the utility model, any change of on the technical scheme basis, being done all falls within the utility model protection range.
Claims (7)
1. switch constant-flow driver more than a kind is used to realize the driving of LED string that at least one LED module is connected successively; It is characterized in that: said led driver comprises rectifier bridge, a constant-current source and at least one controlled current limiting switch; The positive and negative end of the input of said rectifier bridge connects the positive and negative electrode of AC power respectively, and the output plus terminal of this rectifier bridge connects the anode of LED string via controlled current limiting switch; The number of controlled current limiting switch is identical with the number of LED module; Said controlled current limiting switch is corresponding one by one with the LED module; One end of each controlled current limiting switch connects the negative terminal of its pairing LED module respectively, and the other end of all controlled current limiting switches is connected to the output negative terminal of rectifier bridge jointly.
2. many switches constant-flow driver as claimed in claim 1 is characterized in that: said LED module is at least two LED single led, in series or in parallel with each other or mixes a plurality of LED that connect.
3. many switches constant-flow driver as claimed in claim 1 is characterized in that: said rectifier bridge is made up of 4 diodes, and the negative electrode of first diode connects the anode of second diode, and tie point is as the input negative terminal of rectifier bridge; The negative electrode of the 3rd diode connects the anode of the 4th diode, and tie point is as the input anode of rectifier bridge; The anode of first and third diode links to each other, common output plus terminal as rectifier bridge; The second, the negative electrode of four diodes links to each other, common output negative terminal as rectifier bridge.
4. many switches constant-flow driver as claimed in claim 1; It is characterized in that: the controlled current limiting switch that links to each other with said LED module detects the voltage at its two ends automatically; The voltage at controlled current limiting switch two ends will rise along with the rising of input voltage when the electric current of the controlled current limiting switch of flowing through exceeds the current value of setting, and it will automatically shut down when the magnitude of voltage at controlled current limiting switch two ends surpasses set point.
5. many switches constant-flow driver as claimed in claim 1 is characterized in that: the constant-current source circuit of said constant-current source for being made up of triode, current regulator diode, MOSFET, IGBT or FET.
6. many switches constant-flow driver as claimed in claim 1; It is characterized in that: the CPU that turns on and off through the periphery of said controlled current limiting switch carries out unified control, CPU according to the sequential of opening of each current limiting switch of variation active adjustment of input voltage to realize the optimization of system.
7. many switches constant-flow driver as claimed in claim 1 is characterized in that: the controlled current limiting switch quantity of said LED module, constant-current source and series connection is carried out quantitative increase according to the height situation of input ac voltage or is reduced to reach the optimization of system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220221312 CN202617434U (en) | 2012-05-17 | 2012-05-17 | A multi-switch constant-current driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220221312 CN202617434U (en) | 2012-05-17 | 2012-05-17 | A multi-switch constant-current driver |
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| Publication Number | Publication Date |
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| CN202617434U true CN202617434U (en) | 2012-12-19 |
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| CN 201220221312 Expired - Fee Related CN202617434U (en) | 2012-05-17 | 2012-05-17 | A multi-switch constant-current driver |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104969663A (en) * | 2013-02-05 | 2015-10-07 | 株式会社流明斯 | LED lighting device |
-
2012
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104969663A (en) * | 2013-02-05 | 2015-10-07 | 株式会社流明斯 | LED lighting device |
| US9491825B2 (en) | 2013-02-05 | 2016-11-08 | Lumens Co., Ltd. | LED lighting device |
| CN104969663B (en) * | 2013-02-05 | 2017-06-23 | 株式会社流明斯 | LED light device |
| US9918363B2 (en) | 2013-02-05 | 2018-03-13 | Lumens Co., Ltd. | LED lighting device |
| US10206256B2 (en) | 2013-02-05 | 2019-02-12 | Lumens Co., Ltd. | LED lighting device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: INNOEV NEW ENERGY TECHNOLOGY NANJING CO., LTD. Free format text: FORMER OWNER: ZHANG CONGFENG Effective date: 20130620 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20130620 Address after: Dong Qi Road Nanjing City, Jiangsu province 210000 kylin Technology Park No. 666 Patentee after: Innoev New Energy Technology Nanjing Co., Ltd. Address before: Dong Qi Road Nanjing City, Jiangsu province 210000 kylin Technology Park No. 666 Patentee before: Zhang Congfeng |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200909 Address after: Gate 2, Huaqiang Industrial Park, 3 / F, building 5, 188 Hongye North Road, Tangxia Town, Dongguan City, Guangdong Province 523710 Patentee after: Guangdong bode New Energy Technology Co.,Ltd. Address before: Dong Qi Road Nanjing City, Jiangsu province 210000 kylin Technology Park No. 666 Patentee before: INNOEV NEW ENERGY TECHNOLOGY NANJING Co.,Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121219 Termination date: 20210517 |