CN104768264B - High-power Dimmable LED constant-current drive circuit - Google Patents
High-power Dimmable LED constant-current drive circuit Download PDFInfo
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- CN104768264B CN104768264B CN201410002147.4A CN201410002147A CN104768264B CN 104768264 B CN104768264 B CN 104768264B CN 201410002147 A CN201410002147 A CN 201410002147A CN 104768264 B CN104768264 B CN 104768264B
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Abstract
A kind of high-power Dimmable LED constant-current drive circuit, including light-adjusting module, division module and constant-current driven module；It is used to provide operating voltage for constant-current driven module by division module, so that constant-current driven module driving LED is lighted.And light-adjusting module exports burst modem signal to constant-current driven module, so that the size of current of constant-current driven module output changes.Therefore, the input current for the series LED lamp group connecting with constant-current driven module output end changes, and then changes the light emission luminance of series LED lamp group.
Description
Technical field
The present invention relates to constant current driver circuit for LED, more particularly to a kind of with the big of multi gear intensity of illumination regulatory function
Power adjustable light constant current driver circuit for LED.
Background technique
LED is widely used as light source, various LED drive circuits consequently also occurs.Since LED itself is right
Operating voltage requirement is harsher, and overtension is too low all to lead to LED operation electric current fluctuation, so generally wanting to LED
Using the driving method of constant current voltage limiting.Thus, when LED is as current mode workload, the electric current for flowing through LED be must assure that
Within rated current.Integrated integrated high-frequency model design LED driving, but this are mostly used in the low-voltage place of direct current at present
A little driving methods are all firm power output, output power cannot be adjusted, and then intensity of illumination can not be adjusted,
Serious inconvenience is brought to user.
Summary of the invention
Based on this, it is necessary to provide a kind of high-power Dimmable LED constant current drive with multi gear intensity of illumination regulatory function
Dynamic circuit.
A kind of high-power Dimmable LED constant-current drive circuit, including light-adjusting module, division module and constant-current driven module；
The power supply termination operating voltage of the light-adjusting module, output terminate the enable end of the constant-current driven module；It is described
Division module output terminates the power end of the constant-current driven module, ground terminal ground connection；The first of the constant-current driven module is defeated
Outlet and second output terminal connect the cathode of series LED lamp group simultaneously, and the anode of the series LED lamp group connects input power, wherein
The division module input terminates single LED cathode nearest from input power anode in the series LED lamp group；The series connection
The pressure drop of LED light group and be Vfn, the relationship of the input voltage VCC and Vfn of the input power is Vfn < VCC < Vfn+70V；
The division module is used to provide input power for the constant-current driven module, and the light-adjusting module is used for described
Constant-current driven module exports burst modem signal, and the constant-current driven module is controlled according to the burst modem signal
Export size of current.
It in one of the embodiments, further include the operating voltage for input power to be converted to the light-adjusting module
Voltage transformation module, the power end for inputting termination input power, exporting the termination light-adjusting module of the voltage transformation module,
Ground terminal ground connection.
The voltage transformation module includes divider resistance R3, diode ZD1 and capacitor C2 in one of the embodiments,;
The divider resistance R3 mono- terminates input power, the cathode of another termination diode ZD1, the diode
The plus earth of ZD1, the capacitor C2 are parallel to the both ends of the diode ZD1, wherein the anode of the capacitor C2 connects described
The points of common connection of the cathode of diode ZD1, the divider resistance R3 and the diode ZD1 cathode is the voltage modulus of conversion
The output end of block.
The light-adjusting module includes chip IC M7555, capacitor C3, divider resistance RA1 and divides in one of the embodiments,
Piezoresistance RB1；
The divider resistance RA1 and divider resistance RB1 is series at the power end and threshold value end of the chip IC M7555
Between, the points of common connection of the divider resistance RA1 and the divider resistance RB1 meet the discharge end of the chip IC M7555, institute
State the triggering end of a termination chip IC M7555 of capacitor C3, other end ground connection, the triggering end of the chip IC M7555 with
Threshold value end connection.
The division module includes divider resistance R2 and capacitor C1 in one of the embodiments,；
The single LED nearest from input power anode is negative in a termination series LED lamp group of the divider resistance R2
Pole, the other end ground connection of another termination capacitor C1, the capacitor C1, the divider resistance R2 are public with the capacitor C1's
Tie point is the output end of the division module.
The constant-current driven module includes chip A703 and divider resistance R1 in one of the embodiments,；
The sampling end of a termination chip A703 of the divider resistance R1, other end ground connection, the chip A703's
Enable end, power end, the first output end and second output terminal correspond to the enable end of the constant-current driven module, power end,
One output end and second output terminal.
Above-mentioned high-power Dimmable LED constant-current drive circuit is used to provide work for constant-current driven module by division module
Voltage, so that constant-current driven module driving LED is lighted.And light-adjusting module is believed to constant-current driven module output burst modem
Number, so that the size of current of constant-current driven module output changes.Therefore, the series LED being connect with constant-current driven module output end
The input current of lamp group changes, and then changes the light emission luminance of series LED lamp group.
Detailed description of the invention
Fig. 1 is the module map of high-power Dimmable LED constant-current drive circuit；
Fig. 2 is the schematic diagram of high-power Dimmable LED constant-current drive circuit.
Specific embodiment
As shown in Figure 1, being a kind of module map of high-power Dimmable LED constant-current drive circuit.
A kind of high-power Dimmable LED constant-current drive circuit, including light-adjusting module 103, division module 101 and constant current driving
Module 102.
The power supply termination operating voltage of the light-adjusting module 103, output terminate the enabled of the constant-current driven module 102
End；The output of division module 101 terminates the power end of the constant-current driven module 102, ground terminal ground connection；The constant current driving
The first output end and second output terminal of module 102 connect the cathode of series LED lamp group, the anode of the series LED lamp group simultaneously
Connect input power, wherein the division module 101 input terminates nearest from input power anode in the series LED lamp group
Single LED cathode；The pressure drop of the series LED lamp group and be Vfn, the relationship of the input voltage VCC and Vfn of the input power
For Vfn < VCC < Vfn+70V.
The division module 101 is used to provide input power, the light-adjusting module 103 for the constant-current driven module 102
For exporting burst modem signal to the constant-current driven module 102, the constant-current driven module 102 is according to the pulse
Modulation-demodulation signal control output size of current.
The voltage output that division module 101 is used to get from input power and single LED is to constant-current driven module
102, so that 102 output constant current of constant-current driven module is driven series LED lamp group.
Constant-current driven module 102 is for driving series LED lamp group to light, and two output ends of constant-current driven module 102 are same
When connect the cathode of series LED lamp group, therefore, the electric current in series LED lamp group be 102 liang of output end currents of constant-current driven module it
With.Thus 102 liang of output ends of constant-current driven module can connect powerful series LED lamp group simultaneously.
Light-adjusting module 103 is used to control the output electricity in constant-current driven module 102 by output burst modem signal
Stream, and then achieve the effect that control the brightness of series LED lamp group.
Incorporated by reference to Fig. 2.
High-power Dimmable LED constant-current drive circuit further includes for input power to be converted to the light-adjusting module 103
Operating voltage voltage transformation module 104, the voltage transformation module 104 input termination input power, output termination institute
State power end, the ground terminal ground connection of light-adjusting module 103.
Voltage transformation module 104 includes divider resistance R3, diode ZD1 and capacitor C2.
The divider resistance R3 mono- terminates input power, the cathode of another termination diode ZD1, the diode
The plus earth of ZD1, the capacitor C2 are parallel to the both ends of the diode ZD1, wherein the anode of the capacitor C2 connects described
The points of common connection of the cathode of diode ZD1, the divider resistance R3 and the diode ZD1 cathode is the voltage modulus of conversion
The output end of block 104.
If input power is 12V, after voltage transformation module 104 is converted and exports and be to the operating voltage of light-adjusting module 103
5.5V.Wherein, the resistance value size of divider resistance R3 electric current as needed for input power size and light-adjusting module 103 determines.
Light-adjusting module 103 includes chip IC M7555, capacitor C3, divider resistance RA1 and divider resistance RB1.
The divider resistance RA1 and divider resistance RB1 is series at the power end and threshold value end of the chip IC M7555
Between, the points of common connection of the divider resistance RA1 and the divider resistance RB1 meet the discharge end of the chip IC M7555, institute
State the triggering end of a termination chip IC M7555 of capacitor C3, other end ground connection, the triggering end of the chip IC M7555 with
Threshold value end connection.
Division module 101 includes divider resistance R2 and capacitor C1.
The single LED nearest from input power anode is negative in a termination series LED lamp group of the divider resistance R2
Pole, the other end ground connection of another termination capacitor C1, the capacitor C1, the divider resistance R2 are public with the capacitor C1's
Tie point is the output end of the division module 101.
Constant-current driven module 102 includes chip A703 and divider resistance R1.
The sampling end of a termination chip A703 of the divider resistance R1, other end ground connection, the chip A703's
Enable end, power end, the first output end and second output terminal correspond to the enable end of the constant-current driven module 102, power end,
First output end and second output terminal.
In above-mentioned all embodiments, when series LED lamp group includes 3 LED, input power is selected as 12V.Change if necessary
Become LED quantity, input voltage can according to following calculated relationship determine, the pressure drop of series LED lamp group and be Vfn, then input electricity
The relationship of the input voltage VCC and Vfn in source are Vfn < VCC < Vfn+70V.
Based on above-mentioned all embodiments, the working principle of high-power Dimmable LED constant-current drive circuit is as follows:
Divider resistance R2 and capacitor C1 divides the voltage for taking input power, wherein capacitor C1 is used for the interference of input power
Target signal filter.The pressure drop that divider resistance R2 divides, which exports, gives chip A703, for chip A703 normal driving series LED lamp group point
It is bright.
Divider resistance R3 and diode ZD1 is used to be converted to the pressure drop of input power the normal work of chip IC M7555
Voltage.Capacitor C2 is used to filter out the interference signal in input power.After chip IC M7555 receives normal operating voltage, open
Begin to export burst modem signal to chip A703.Wherein, the size of divider resistance RA1 and divider resistance RB1 determine pulse
The duty ratio of modulation-demodulation signal.Specific formula for calculation is duty ratio D=RB/(RA+2RB).The frequency of burst modem signal
It is determined by capacitor C3, divider resistance RA1 and divider resistance RB1.Specific formula for calculation is f=1.46/(RA+2RB) * C, and wherein C is
The capacitance of capacitor C3.
The frequency and duty ratio of burst modem signal determine the output electric current of chip A703.Therefore, chip IC M7555
The output size of current of chip A703 can be changed.The brightness of series LED lamp group can thus be changed.Further, chip
The two output end parallel connections of A703 are followed by series LED lamp group.Therefore, the electric current of series LED lamp group is double, thus can connect high-power
LED light group.The brightness of series LED lamp group is determined by constant current operation electric current Iled.Chip A703 is in no reception chip
Before the burst modem signal of ICM7555, the first output end of chip A703 and the output electric current of second output terminal are by dividing
Resistance R1 is determined.Specific formula for calculation are as follows: Rset=(1.2V/Iled) * 150, i.e. the first output end of chip A703 and second defeated
Outlet electric current is Iled.Because two output ends of chip A703 are in parallel, thus the electric current of series LED lamp group is 2Iled.That is core
The burst modem signal of piece ICM7555 is then adjustment Iled size.
Above-mentioned high-power Dimmable LED constant-current drive circuit is used to mention for constant-current driven module 102 by division module 101
For operating voltage, so that constant-current driven module 102 drives LED to light.And light-adjusting module 103 is exported to constant-current driven module 102
Burst modem signal, so that the size of current that constant-current driven module 102 exports changes.Therefore, with constant-current driven module 102
The input current variation of the series LED lamp group of output end connection, and then change the light emission luminance of series LED lamp group.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (4)
1. a kind of high-power Dimmable LED constant-current drive circuit, which is characterized in that including light-adjusting module, division module and constant current
Drive module；
The power supply termination operating voltage of the light-adjusting module, output terminate the enable end of the constant-current driven module；The partial pressure
Module output terminates the power end of the constant-current driven module, ground terminal ground connection；First output end of the constant-current driven module
Connect the cathode of series LED lamp group simultaneously with second output terminal, the anode of the series LED lamp group connects input power, wherein described
Division module includes in a termination series LED lamp group of divider resistance R2 and capacitor C1, the divider resistance R2 from input
The nearest single LED cathode of positive pole, the other end ground connection of another termination capacitor C1, the capacitor C1, the partial pressure
The points of common connection of the resistance R2 and capacitor C1 is the output end of the division module；The pressure drop of the series LED lamp group and
For Vfn, the relationship of the input voltage VCC and Vfn of the input power are Vfn < VCC < Vfn+70V；
The division module is used to provide input power for the constant-current driven module, and the light-adjusting module is used for the constant current
Drive module exports burst modem signal, and the constant-current driven module is controlled according to the burst modem signal and exported
Size of current；
It further include the voltage transformation module for input power to be converted to the operating voltage of the light-adjusting module, the voltage turns
Change the mold the input termination input power of block, output terminates the power end of the light-adjusting module, ground terminal ground connection.
2. high-power Dimmable LED constant-current drive circuit according to claim 1, which is characterized in that the voltage conversion
Module includes divider resistance R3, diode ZD1 and capacitor C2；
The termination of divider resistance R3 mono- input power, the cathode of another termination diode ZD1, the diode ZD1's
Plus earth, the capacitor C2 are parallel to the both ends of the diode ZD1, wherein the anode of the capacitor C2 connects two pole
The points of common connection of the cathode of pipe ZD1, the divider resistance R3 and the diode ZD1 cathode is the voltage transformation module
Output end.
3. high-power Dimmable LED constant-current drive circuit according to claim 1, which is characterized in that the light-adjusting module
Including chip IC M7555, capacitor C3, divider resistance RA1 and divider resistance RB1；
The divider resistance RA1 and divider resistance RB1 be series at the chip IC M7555 power end and threshold value end it
Between, the points of common connection of the divider resistance RA1 and the divider resistance RB1 connect the discharge end of the chip IC M7555, described
The triggering end of a termination chip IC M7555 of capacitor C3, other end ground connection, the triggering end and threshold of the chip IC M7555
It is worth end connection.
4. high-power Dimmable LED constant-current drive circuit according to claim 1, which is characterized in that the constant current driving
Module includes chip A703 and divider resistance R1；
The sampling end of a termination chip A703 of the divider resistance R1, other end ground connection, the chip A703's is enabled
End, power end, the first output end and second output terminal correspond to the enable end of the constant-current driven module, power end, first defeated
Outlet and second output terminal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410002147.4A CN104768264B (en) | 2014-01-02 | 2014-01-02 | High-power Dimmable LED constant-current drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410002147.4A CN104768264B (en) | 2014-01-02 | 2014-01-02 | High-power Dimmable LED constant-current drive circuit |
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| CN104768264A CN104768264A (en) | 2015-07-08 |
| CN104768264B true CN104768264B (en) | 2019-03-22 |
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| CN101541116B (en) * | 2008-03-19 | 2012-10-31 | 淄博诺达网络科技有限公司 | Electronic ballast of alternate current high-power LED illumination energy-saving lamp |
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| CN2638483Y (en) * | 2003-06-11 | 2004-09-08 | 悦诚贸易（国际）有限公司 | Flash drive device |
| CN102781134A (en) * | 2011-05-09 | 2012-11-14 | 海洋王照明科技股份有限公司 | Dimmable LED (Light Emitting Diode) driving circuit and lamp |
| CN103139968A (en) * | 2011-11-30 | 2013-06-05 | 海洋王照明科技股份有限公司 | Light-emitting diode (LED) driving circuit and LED lamp |
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