CN104768272A - High-power LED constant-current low-power-consumption driving circuit - Google Patents
High-power LED constant-current low-power-consumption driving circuit Download PDFInfo
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- CN104768272A CN104768272A CN201410004131.7A CN201410004131A CN104768272A CN 104768272 A CN104768272 A CN 104768272A CN 201410004131 A CN201410004131 A CN 201410004131A CN 104768272 A CN104768272 A CN 104768272A
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Abstract
Provided is a high-power LED constant-current low-power-consumption driving circuit. Working voltage is provided for a constant-current driving module through a voltage dividing module to enable the constant-current driving module to drive an LED lamp group. A trigger module outputs a trigger signal to the constant-current driving module to enable the constant-current driving module to output current or stop outputting current. Thus, a series LED lamp group connected with the output end of the constant-current driving module can perform a turning-on/off action so that on-off of the series LED lamp group is controlled. The relation between the input voltage VCC and the voltage drop Vfn of the series LED lamp group satisfies the expression Vfn<VCC<Vfn+70V. Therefore, the circuit is applicable to a wide range of input voltage, and is further applicable to LED driving in a variety of occasions.
Description
Technical field
The present invention relates to LED constant current low-power-consumption driving circuit, particularly relate to the great power LED constant current low-power-consumption driving circuit that a kind of input voltage range is large.
Background technology
The application of LED in life is more and more extensive, thus, also occurs the drived control problem of LED thereupon.General, the change of LED input voltage greatly or the many low-power LED of kind of powering is lighted or backlight control problem is particularly outstanding.Such as, the indicator light, various exit lighting boards etc. of escape route.Also little to the brightness requirement of lamp, only require light or extinguish (backlight), again because these lamp fields of employment are different, therefore, power supply voltage range is wider.
Summary of the invention
Based on this, be necessary the great power LED constant current low-power-consumption driving circuit providing a kind of input voltage range large.
A kind of great power LED constant current low-power-consumption driving circuit, comprises trigger module, division module and constant-current driven module;
The output of division module described in the power supply termination of described trigger module, the Enable Pin exporting constant-current driven module described in termination, earth terminal ground connection; From single LEDs negative pole that input power positive pole is nearest in described division module input termination series LED lamp group, the power end of constant-current driven module described in the output termination of described division module, earth terminal ground connection; First output of described constant-current driven module and the second output connect the negative pole of series LED lamp group simultaneously, the positive pole of described series LED lamp group connects input power, wherein, the pressure drop of described series LED lamp group and be Vfn, the pass of input voltage VCC and the Vfn of described input power is Vfn < VCC < Vfn+70V;
Described trigger module is used for sending triggering signal to described constant-current driven module, described division module is used for described constant-current driven module output services voltage, and described constant-current driven module drives described series LED lamp group light and extinguish according to the triggering signal of described trigger module.
Wherein in an embodiment, described trigger module comprises electric capacity C1, divider resistance R3 and trigger switch K1;
The one termination input power of described electric capacity C1 and described divider resistance R3, the other end ground connection of described electric capacity C1, one end ground connection of described trigger switch K1, divider resistance R3 described in another termination is away from one end of described electric capacity C1, and the points of common connection of described trigger switch K1 and described divider resistance R3 is the output of described trigger module.
Wherein in an embodiment, described division module comprises divider resistance R2, from single LEDs negative pole that input power positive pole is nearest in the one termination series LED lamp group of described divider resistance R2, the power end of constant-current driven module and described trigger module described in another termination.
Wherein in an embodiment, described constant-current driven module comprises chip A703 and divider resistance R1;
The sampling end of chip A703 described in one termination of described divider resistance R1, other end ground connection, the Enable Pin of described chip A703, power end, the first output and the second output correspond to the Enable Pin of described constant-current driven module, power end, the first output and the second output.
Above-mentioned great power LED constant current low-power-consumption driving circuit is used for providing operating voltage for constant-current driven module by division module, makes constant-current driven module can driving LED lamp group.And trigger module exports triggering signal to constant-current driven module, the electric current that constant-current driven module is exported or stopping output current.Thus the series LED lamp group be connected with constant-current driven module output can perform to be lighted or extinguishes action, thus controls lighting and extinguishing of series LED lamp group.Because the pass of input voltage VCC and series LED lamp group pressure drop Vfn is Vfn < VCC < Vfn+70V, therefore, it is possible to the input voltage that the scope of application is large.And then the LED that can be suitable for multiple occasion drives.
Accompanying drawing explanation
Fig. 1 is the module map of great power LED constant current low-power-consumption driving circuit;
Fig. 2 is the schematic diagram of great power LED constant current low-power-consumption driving circuit.
Embodiment
As shown in Figure 1, be a kind of module map of great power LED constant current low-power-consumption driving circuit.
A kind of great power LED constant current low-power-consumption driving circuit, comprises trigger module 103, division module 101 and constant-current driven module 102.
The output of the power supply termination division module 101 of described trigger module 103, the Enable Pin exporting constant-current driven module 102 described in termination, earth terminal ground connection; Described division module 101 inputs single LEDs negative pole nearest from input power positive pole in termination series LED lamp group, the power end of constant-current driven module 102 described in the output termination of described division module 101, earth terminal ground connection; First output of described constant-current driven module 102 and the second output connect the negative pole of series LED lamp group simultaneously, and the positive pole of described series LED lamp group connects input power.Wherein, the pressure drop of series LED lamp group and be Vfn, the pass of input voltage VCC and the Vfn of described input power is Vfn < VCC < Vfn+70V.
Trigger module 103 is for sending triggering signal to described constant-current driven module 102, described division module 101 is for described constant-current driven module 102 output services voltage, and described constant-current driven module 102 drives described series LED lamp group light and extinguish according to the triggering signal of described trigger module 103.
Division module 101, for the voltage got from input power and single LEDs is exported to constant-current driven module 102, makes can normally working of constant-current driven module 102, thus drives series LED lamp group.
Constant-current driven module 102 is lighted and extinguishing for driving series LED lamp group, and two outputs of constant-current driven module 102 connect the negative pole of series LED lamp group simultaneously, and therefore, the electric current in series LED lamp group is constant-current driven module 102 liang of output end current sums.Two output end currents due to constant-current driven module 102 are total output current of constant-current driven module 102, and the pressure drop of the series LED lamp group be connected with constant-current driven module 102 is fixed, thus electric current is larger, then require that series LED lamp group is powerful, therefore constant-current driven module 102 liang of outputs can connect powerful series LED lamp group respectively.
Trigger module 103 for triggering constant-current driven module 102 whether output current, and then reaches and controls lighting and extinguishing of series LED lamp group.
Above-mentioned great power LED constant current low-power-consumption driving circuit is applicable to change in voltage is large or power supply kind is many small power LED illumination or backlight.The indicator light of such as escape route, various exit lighting boards etc.Little to the brightness requirement of lamp, but due to these lamp fields of employment different, therefore, power supply voltage range is wider.Powered battery mostly.Preferably, supply district is 6V-50V, is almost suitable for the supply district of all LED lamp.And output current is within the scope of 20mA-150mA, if desired, also can up to 300mA.Constant-current driven module 102 output is withstand voltage reaches 75V, can be connected in series a large amount of LED, and also can reduce by LED number on the circuit designed, other parameter is motionless simultaneously.Such load connects just very flexible, convenient.
Incorporated by reference to Fig. 2.
Described trigger module 103 comprises electric capacity C1, divider resistance R3 and trigger switch K1.
The one termination input power of described electric capacity C1 and described divider resistance R3, the other end ground connection of described electric capacity C1, one end ground connection of described trigger switch K1, divider resistance R3 described in another termination is away from one end of described electric capacity C1, and the points of common connection of described trigger switch K1 and described divider resistance R3 is the output of described trigger module.
Division module 101 comprises divider resistance R2, from single LEDs negative pole that input power positive pole is nearest in a termination series LED lamp group of described divider resistance R2, and the power end of constant-current driven module 102 and described trigger module 103 described in another termination.
Constant-current driven module 102 comprises chip A703 and divider resistance R1.
The sampling end of chip A703 described in one termination of described divider resistance R1, other end ground connection, the Enable Pin of described chip A703, power end, the first output and the second output correspond to the Enable Pin of described constant-current driven module 102, power end, the first output and the second output.
In above-mentioned all embodiments, when series LED lamp group comprises 3 LEDs, input power elects 12V as.If need to change LED quantity, can determining according to calculated relationship below of input voltage, the pressure drop of series LED lamp group and be Vfn, then the pass of input voltage VCC and the Vfn of input power is Vfn < VCC < Vfn+70V.
Based on above-mentioned all embodiments, the operation principle of great power LED constant current low-power-consumption driving circuit is as follows:
Divider resistance R2 divides the voltage got on input power and single LEDs, and the pressure drop of getting is exported to chip A703 and electric capacity C1 by divider resistance R2, and namely divider resistance R2 exports electric operating voltage to chip A703, and thus chip A703 can drive series LED lamp group.Meanwhile, the enable termination divider resistance R3 of chip A703 and the points of common connection of trigger switch K1.Thus first output of chip A703 and the second output can output current be Iled.Iled is determined by the resistance size of divider resistance R1, and specific formula for calculation is Rset=(1.2V/Iled) * 180.
When chip A703, divider resistance R2, electric capacity C1, divider resistance R3 access input power, series LED lamp group is in state to be triggered.Concrete, when pressing trigger switch K1, the Enable Pin namely to chip A703 exports triggering signal, and chip A703 is triggered, first output of chip A703 and the second output output current Iled simultaneously.Namely the electric current of series LED lamp group is 2Iled, and series LED lamp group is lighted.When trigger switch K1 flicks, namely the Enable Pin of chip A703 does not have triggering signal, and chip A703 enters pre-output current status, and namely first output of chip A703 and the second output do not have electric current to export, and series LED lamp group is extinguished.
In the present embodiment, the voltage of input power can from 6V to 50V, and the output of chip A703 is withstand voltage reaches 75V.Thus, chip A703 can adapt to the supply power voltage of input power, and thus circuit supply and load supplying can directly share, without the need to voltage transitions.Therefore circuit structure is simple, thus can be cost-saving, and failure rate also can reduce.When just circuit is also with load together large power voltage supply, caloric value more greatly, may require that main control chip need connect with large-area deposited copper like this.To dispel the heat.And chip A703 has overheat protective function, namely when working temperature exceedes threshold temperature 150 DEG C, chip A703 stops series LED lamp group output current.
Above-mentioned great power LED constant current low-power-consumption driving circuit is used for providing operating voltage for 102 constant-current driven modules by 101 division module, makes constant-current driven module 102 driving LED lamp group.And trigger module 103 exports triggering signal to constant-current driven module 102, the electric current that constant-current driven module 102 is exported or stopping output current.Thus the series LED lamp group be connected with constant-current driven module 102 output can perform to be lighted or extinguishes action, thus controls lighting and extinguishing of series LED lamp group.Because the pass of input voltage VCC and series LED lamp group pressure drop Vfn is Vfn < VCC < Vfn+70V, therefore, it is possible to the input voltage that the scope of application is large.And then the LED that can be suitable for multiple occasion drives.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (4)
1. a great power LED constant current low-power-consumption driving circuit, is characterized in that, comprises trigger module, division module and constant-current driven module;
The output of division module described in the power supply termination of described trigger module, the Enable Pin exporting constant-current driven module described in termination, earth terminal ground connection; From single LEDs negative pole that input power positive pole is nearest in described division module input termination series LED lamp group, the power end of constant-current driven module described in the output termination of described division module, earth terminal ground connection; First output of described constant-current driven module and the second output connect the negative pole of series LED lamp group simultaneously, the positive pole of described series LED lamp group connects input power, wherein, the pressure drop of described series LED lamp group and be Vfn, the pass of input voltage VCC and the Vfn of described input power is Vfn < VCC < Vfn+70V;
Described trigger module is used for sending triggering signal to described constant-current driven module, described division module is used for described constant-current driven module output services voltage, and described constant-current driven module drives described series LED lamp group light and extinguish according to the triggering signal of described trigger module.
2. great power LED constant current low-power-consumption driving circuit according to claim 1, is characterized in that, described trigger module comprises electric capacity C1, divider resistance R3 and trigger switch K1;
The one termination input power of described electric capacity C1 and described divider resistance R3, the other end ground connection of described electric capacity C1, one end ground connection of described trigger switch K1, divider resistance R3 described in another termination is away from one end of described electric capacity C1, and the points of common connection of described trigger switch K1 and described divider resistance R3 is the output of described trigger module.
3. great power LED constant current low-power-consumption driving circuit according to claim 2, it is characterized in that, described division module comprises divider resistance R2, from single LEDs negative pole that input power positive pole is nearest in the one termination series LED lamp group of described divider resistance R2, the power end of constant-current driven module and described trigger module described in another termination.
4. great power LED constant current low-power-consumption driving circuit according to claim 1, is characterized in that, described constant-current driven module comprises chip A703 and divider resistance R1;
The sampling end of chip A703 described in one termination of described divider resistance R1, other end ground connection, the Enable Pin of described chip A703, power end, the first output and the second output correspond to the Enable Pin of described constant-current driven module, power end, the first output and the second output.
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| CN201518546U (en) * | 2009-03-30 | 2010-06-30 | 西安孚莱德光电科技有限公司 | Led digital driver |
| CN103118467A (en) * | 2013-02-18 | 2013-05-22 | 盐城工学院 | High-power LED constant current driving circuit and parameter algorithm thereof |
| US20130193879A1 (en) * | 2010-05-10 | 2013-08-01 | Innosys, Inc. | Universal Dimmer |
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2014
- 2014-01-02 CN CN201410004131.7A patent/CN104768272B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101541116A (en) * | 2008-03-19 | 2009-09-23 | 杨书水 | Electronic ballast of alternate current high-power LED illumination energy-saving lamp |
| CN201518546U (en) * | 2009-03-30 | 2010-06-30 | 西安孚莱德光电科技有限公司 | Led digital driver |
| US20130193879A1 (en) * | 2010-05-10 | 2013-08-01 | Innosys, Inc. | Universal Dimmer |
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