CN104768267A - Wide- voltage and low-power LED constant-current driving circuit - Google Patents
Wide- voltage and low-power LED constant-current driving circuit Download PDFInfo
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- CN104768267A CN104768267A CN201410002167.1A CN201410002167A CN104768267A CN 104768267 A CN104768267 A CN 104768267A CN 201410002167 A CN201410002167 A CN 201410002167A CN 104768267 A CN104768267 A CN 104768267A
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Abstract
Provided is a wide-voltage and low-power LED constant-current driving circuit. An enable signal 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 constant current driver circuit for LED, particularly relate to the Width funtion low-power LED constant-current drive 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 Width funtion low-power LED constant-current drive circuit providing a kind of input voltage range large.
A kind of Width funtion low-power LED constant-current drive circuit, comprises trigger module, division module and constant-current driven module;
The power supply termination input power of described trigger module, the Enable Pin exporting constant-current driven module described in termination, earth terminal ground connection; The input termination input power of described division module, the Enable Pin exporting constant-current driven module described in termination, earth terminal ground connection; The power supply termination input power of described constant-current driven module, first output of described constant-current driven module and the second output correspondence connect the negative pole of the first series LED lamp group and the second series LED lamp group, the positive pole of described series LED lamp group connects input power, wherein, the pressure drop of described first series LED lamp group and described second 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 drives lighting and extinguishing of described first series LED lamp group and described second series LED lamp group for triggering described constant-current driven module, described division module is used for described constant-current driven module output enable signal, and described constant-current driven module drives described first series LED lamp group and described second series LED lamp group according to described enable signal.
Wherein in an embodiment, described trigger module comprises electric capacity C1 and trigger switch K1;
The one termination input power of described electric capacity C1, other end ground connection, one end ground connection of described trigger switch K1, the Enable Pin of constant-current driven module described in another termination.
Wherein in an embodiment, described division module comprises divider resistance R2 and voltage-stabiliser tube ZD1, the one termination input power of described divider resistance R2, the negative pole of voltage-stabiliser tube ZD1 described in another termination, the plus earth of described voltage-stabiliser tube ZD1, the points of common connection of described divider resistance R2 and described voltage-stabiliser tube ZD1 negative pole connects the Enable Pin of described constant-current driven module.
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 Width funtion low-power LED constant-current drive circuit is used for providing enable signal for constant-current driven module by division module, makes constant-current driven module 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 can the performing of series LED lamp group be connected with constant-current driven module output is 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 Width funtion low-power LED constant-current drive circuit;
Fig. 2 is the schematic diagram of Width funtion low-power LED constant-current drive circuit.
Embodiment
As shown in Figure 1, be a kind of module map of Width funtion low-power LED constant-current drive circuit.
A kind of Width funtion low-power LED constant-current drive circuit, comprises trigger module 103, division module 101 and constant-current driven module 102.
The power supply termination input power of described trigger module 103, the Enable Pin exporting constant-current driven module 102 described in termination, earth terminal ground connection; The input termination input power of described division module 101, the Enable Pin exporting constant-current driven module 102 described in termination, earth terminal ground connection; The power supply termination input power of described constant-current driven module 102, the first output of described constant-current driven module 102 and the second output correspondence connect the negative pole of the first series LED lamp group and the second series LED lamp group, and the positive pole of described series LED lamp group connects input power.Wherein, the pressure drop of described first series LED lamp group and described second 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 drives lighting and extinguishing of described first series LED lamp group and described second series LED lamp group for triggering described constant-current driven module 102, described division module 101 is for described constant-current driven module 102 output enable signal, and described constant-current driven module 102 drives described first series LED lamp group and described second series LED lamp group according to described enable signal.
Division module 101, for the voltage got from input power is exported to constant-current driven module 102, makes the Enable Pin of constant-current driven module 102 have enable signal, and thus constant-current driven module 102 can drive the first series LED lamp group and the second series LED lamp group.
Constant-current driven module 102 is lighted and extinguishing for driving the first series LED lamp group and the second series LED lamp group, and two outputs of constant-current driven module 102 connect the negative pole of the first series LED lamp group and the second series LED lamp group respectively, therefore, the electric current in the first series LED lamp group and the second series LED lamp group corresponds to constant-current driven module 102 first output and the second output end current.Because two output end currents of constant-current driven module 102 are by the shunting of 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 less, then require that series LED lamp group is low power, therefore constant-current driven module 102 liang of outputs can connect low power series LED lamp group respectively.
Trigger module 103 for triggering constant-current driven module 102 whether output current, and then reaches lighting and extinguishing of control first series LED lamp group and the second series LED lamp group.
Above-mentioned Width funtion low-power LED constant-current drive circuit is large due to input voltage range, is therefore 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, the supply district of constant-current driven module 102 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 and trigger switch K1.
The one termination input power of described electric capacity C1, other end ground connection, one end ground connection of described trigger switch K1, the Enable Pin of constant-current driven module 102 described in another termination.
Division module 101 comprises divider resistance R2 and voltage-stabiliser tube ZD1, the one termination input power of described divider resistance R2, the negative pole of voltage-stabiliser tube ZD1 described in another termination, the plus earth of described voltage-stabiliser tube ZD1, the points of common connection of described divider resistance R2 and described voltage-stabiliser tube ZD1 negative pole connects the Enable Pin of described constant-current driven module 102.
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 Width funtion low-power LED constant-current drive circuit is as follows:
Divider resistance R2 and voltage-stabiliser tube ZD1 divides the voltage getting input power, the pressure drop of getting is exported to chip A703 by divider resistance R2, namely divider resistance R2 is to chip A703 output enable signal, and thus chip A703 can drive the first series LED lamp group and the second series LED lamp group.Meanwhile, the power supply termination input power of chip A703.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 and voltage-stabiliser tube ZD1 access input power, the first series LED lamp group and the second series LED lamp group are 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 the first series LED lamp group and the second series LED lamp group is Iled, and the first series LED lamp group and the second series LED lamp group are lighted.When trigger switch K1 flicks, namely the Enable Pin of chip A703 does not have triggering signal, 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 the first series LED lamp group and the second series LED lamp group are 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 Width funtion low-power LED constant-current drive circuit is used for providing enable signal 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 can the performing of series LED lamp group be connected with constant-current driven module 102 output is 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 Width funtion low-power LED constant-current drive circuit, is characterized in that, comprises trigger module, division module and constant-current driven module;
The power supply termination input power of described trigger module, the Enable Pin exporting constant-current driven module described in termination, earth terminal ground connection; The input termination input power of described division module, the Enable Pin exporting constant-current driven module described in termination, earth terminal ground connection; The power supply termination input power of described constant-current driven module, first output of described constant-current driven module and the second output correspondence connect the negative pole of the first series LED lamp group and the second series LED lamp group, the positive pole of described series LED lamp group connects input power, wherein, the pressure drop of described first series LED lamp group and described second 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 drives lighting and extinguishing of described first series LED lamp group and described second series LED lamp group for triggering described constant-current driven module, described division module is used for described constant-current driven module output enable signal, and described constant-current driven module drives described first series LED lamp group and described second series LED lamp group according to described enable signal.
2. Width funtion low-power LED constant-current drive circuit according to claim 1, is characterized in that, described trigger module comprises electric capacity C1 and trigger switch K1;
The one termination input power of described electric capacity C1, other end ground connection, one end ground connection of described trigger switch K1, the Enable Pin of constant-current driven module described in another termination.
3. Width funtion low-power LED constant-current drive circuit according to claim 2, it is characterized in that, described division module comprises divider resistance R2 and voltage-stabiliser tube ZD1, the one termination input power of described divider resistance R2, the negative pole of voltage-stabiliser tube ZD1 described in another termination, the plus earth of described voltage-stabiliser tube ZD1, the points of common connection of described divider resistance R2 and described voltage-stabiliser tube ZD1 negative pole connects the Enable Pin of described constant-current driven module.
4. Width funtion low-power LED constant-current drive 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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| CN201410002167.1A CN104768267B (en) | 2014-01-02 | 2014-01-02 | Width funtion low-power LED constant-current drive circuit |
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| CN201410002167.1A CN104768267B (en) | 2014-01-02 | 2014-01-02 | Width funtion low-power LED constant-current drive circuit |
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