CN104768271B - Constant current driver circuit for LED with an automatic light meter - Google Patents
Constant current driver circuit for LED with an automatic light meter Download PDFInfo
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- CN104768271B CN104768271B CN201410004096.9A CN201410004096A CN104768271B CN 104768271 B CN104768271 B CN 104768271B CN 201410004096 A CN201410004096 A CN 201410004096A CN 104768271 B CN104768271 B CN 104768271B
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Abstract
Constant current driver circuit for LED with an automatic light meter is used to provide operating voltage for light-adjusting module by division module, so that light-adjusting module exports burst modem signal to constant-current driven module, so as to change the size of current of constant-current driven module output.And then the input current for the series LED lamp group connecting with constant-current driven module output end can be controlled, therefore change the light emission luminance of series LED lamp group.Simultaneously, light sensation module is used to incude the brightness of series LED lamp group, when the brightness of series LED lamp group is below or above specified light intensity, the light-adjusting module is set to change the duty ratio of burst modem signal, to change the output electric current of constant-current driven module, the brightness of series LED lamp group is made to be in specified light intensity.
Description
Technical field
The present invention relates to constant current driver circuit for LED, drive more particularly to a kind of LED constant current with an automatic light meter simple to operation
Dynamic circuit.
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 constant current driver circuit for LED with an automatic light meter simple to operation.
A kind of constant current driver circuit for LED with an automatic light meter, including light-adjusting module, light sensation module, division module and constant current driving
Module；
The power supply of the light-adjusting module terminates the output end of the division module, output terminates the constant-current driven module
The input of enable end, the division module terminates input power；The power supply termination input power of the constant-current driven module, ground connection
End ground connection, output terminate the anode of series LED lamp group, and the cathode of the series LED lamp group connects the anti-of the constant-current driven module
Present end, the power supply of the light sensation module terminates the output end of the division module, output terminate the light-adjusting module feedback end,
Ground terminal ground connection；
The division module is used to provide rated operational voltage, the light modulation for the light-adjusting module and the light sensation module
Module is used to export burst modem signal to the constant-current driven module, and the constant-current driven module is according to the pulse tune
Demodulated signal control output size of current processed, the brightness and feedback that the light sensation module is used to incude the series LED lamp group are arrived
The light-adjusting module, the light-adjusting module feed back the burst modem signal of brightness adjustment output based on the received, make described
The brightness that constant-current driven module controls the series LED lamp group is in specified light intensity.
The light-adjusting module includes microcontroller U2, divider resistance R2 and crystal oscillator in one of the embodiments,
Y1；
The crystal oscillator Y1 is connected between the end XO of microcontroller U2 and the end XI, the power supply of the microcontroller U2
End, feedback end RSI and output end SDO correspond to the power end, feedback end and output end of the light-adjusting module, the divider resistance
R2 mono- terminates the output end of the division module, the resetting end of another termination microcontroller U2.
The division module includes divider resistance R1, voltage-stabiliser tube ZD1 and electrolytic capacitor C4 in one of the embodiments,；
The termination of divider resistance R1 mono- input power, the cathode of another termination voltage-stabiliser tube ZD1, the voltage-stabiliser tube ZD1's
Cathode ground connection, the electrolytic capacitor C4 are in parallel with the voltage-stabiliser tube ZD1, wherein the anode of the electrolytic capacitor C4 connects described steady
The points of common connection of the cathode of pressure pipe ZD1, the divider resistance R1 and the voltage-stabiliser tube ZD1 are the output of the division module
End.
The constant-current driven module includes chip TPS61161A, inductance L1, capacitor C3 in one of the embodiments,；
The inductance L1 mono- terminates input power, the switch terminals of another termination chip TPS61161A, the chip
The input termination input power of TPS61161A, feedback terminate the output end of the sampling module, the enabled termination light-adjusting module
Output end, ground terminal ground connection；The capacitor C3 mono- terminates the common end of the chip TPS61161A, other end ground connection.
It in one of the embodiments, further include capacitor C1, the capacitor C1 mono- terminates input power, other end ground connection.
It in one of the embodiments, further include diode D1, the anode of the diode D1 connects the constant current driving mould
The output end of block, the cathode of the diode D1 connect the anode of the series LED lamp group.
It in one of the embodiments, further include capacitor C2, the capacitor C2 mono- terminates the cathode of the diode D1, separately
One end ground connection.
It in one of the embodiments, further include sampling module, the sampling module includes sampling resistor Rset, described to adopt
Sample one end resistance Rset ground connection, the other end are the output end of the sampling module.
The light sensation module includes light sensor U3 in one of the embodiments, the electricity of the light sensor U3
Source, ground terminal, output end correspond to power end, ground terminal and the output end of the light sensation module.
Above-mentioned constant current driver circuit for LED with an automatic light meter is used to provide operating voltage for light-adjusting module by division module, makes
It obtains light-adjusting module and exports burst modem signal to constant-current driven module, so as to change the electricity of constant-current driven module output
Flow size.And then the input current for the series LED lamp group connecting with constant-current driven module output end can be controlled, therefore change string
Join the light emission luminance of LED light group.Meanwhile light sensation module is used to incude the brightness of series LED lamp group, in the bright of series LED lamp group
When degree is below or above specified light intensity, the light-adjusting module is set to change the duty ratio of burst modem signal, to change perseverance
The output electric current for flowing drive module, makes the brightness of series LED lamp group be in specified light intensity.
Detailed description of the invention
Fig. 1 is the module map of constant current driver circuit for LED with an automatic light meter；
Fig. 2 is the schematic diagram of constant current driver circuit for LED with an automatic light meter.
Specific embodiment
As shown in Figure 1, being a kind of module map of constant current driver circuit for LED with an automatic light meter.
A kind of constant current driver circuit for LED with an automatic light meter, including light-adjusting module 102, division module 101,104 and of light sensation module
Constant-current driven module 103.
The power supply of the light-adjusting module 102 terminates the output end of the division module 101, output terminates the constant current driving
The input of the enable end of module 103, the division module 101 terminates input power；The power end of the constant-current driven module 103
Input power, ground terminal ground connection, the anode for exporting termination series LED lamp group are connect, the cathode of the series LED lamp group connects the perseverance
Flow the feedback end of drive module 103, the output end of the power supply termination division module 101 of the light sensation module 104, output termination institute
State feedback end, the ground terminal ground connection of light-adjusting module 102.
The division module 101 is used to provide nominal operation electricity for the light-adjusting module 102 and the light sensation module 104
Pressure, the light-adjusting module 102 are used to export burst modem signal, the constant current driving to the constant-current driven module 103
Module 103 controls output size of current according to the burst modem signal, and the light sensation module 104 is for incuding the string
Join the brightness of LED light group and feed back and arrive the light-adjusting module 102, the light-adjusting module 102 feeds back brightness adjustment based on the received
The burst modem signal of output, the brightness for making the constant-current driven module 103 control the series LED lamp group are in specified
Light intensity.
Division module 101 for will the voltage output that get from input power to light-adjusting module 102 and light sensation module 104,
Light-adjusting module 102 and light sensation module 104 are worked normally, and exports burst modem signal to constant-current driven module 103.
Constant-current driven module 103 is for driving series LED lamp group to light, and burst modem signal changes based on the received
Become output size of current.
Light-adjusting module 102 is used to export burst modem signal to constant-current driven module 103, so that constant current be made to drive mould
Block 103 changes output electric current, and then reaches the electric current of control series LED lamp group.
Light sensation module 104 is used to incude the brightness of series LED lamp group, and feeds back to light-adjusting module 102, so that light-adjusting module
The duty ratio of the burst modem signal of 102 outputs changes, and protects so as to control the electric current of the output of constant-current driven module 103
Hold it is constant, and then achieve the effect that control series LED lamp group brightness be in specified light intensity.
As shown in Fig. 2, being the schematic diagram of constant current driver circuit for LED with an automatic light meter.
Light-adjusting module 102 includes microcontroller U2, divider resistance R2 and crystal oscillator Y1.
The crystal oscillator Y1 is connected between the end XO of microcontroller U2 and the end XI, the power supply of the microcontroller U2
End, feedback end RSI and output end SDO correspond to power end, feedback end and the output end of the light-adjusting module 102, the partial pressure
Resistance R2 mono- terminates the output end of the division module 101, the resetting end of another termination microcontroller U2.
Division module 101 includes divider resistance R1, voltage-stabiliser tube ZD1 and electrolytic capacitor C4.
The termination of divider resistance R1 mono- input power, the cathode of another termination voltage-stabiliser tube ZD1, the voltage-stabiliser tube ZD1's
Cathode ground connection, the electrolytic capacitor C4 are in parallel with the voltage-stabiliser tube ZD1, wherein the anode of the electrolytic capacitor C4 connects described steady
The points of common connection of the cathode of pressure pipe ZD1, the divider resistance R1 and the voltage-stabiliser tube ZD1 are the output of the division module
End.
Constant-current driven module 103 includes chip TPS61161A, inductance L1, capacitor C3.
The inductance L1 mono- terminates input power, the switch terminals of another termination chip TPS61161A, the chip
The input termination input power of TPS61161A, feedback terminate the output end of the sampling module 104, the enabled termination light modulation
The output end of module 102, ground terminal ground connection；The capacitor C3 mono- terminates the common end of the chip TPS61161A, another termination
Ground.
Constant current driver circuit for LED with an automatic light meter further includes capacitor C1, and the capacitor C1 mono- terminates input power, another termination
Ground.
Constant current driver circuit for LED with an automatic light meter further includes diode D1, and the anode of the diode D1 connects the constant current and drives
The output end of dynamic model block 103, the cathode of the diode D1 connect the anode of the series LED lamp group.
Constant current driver circuit for LED with an automatic light meter further includes capacitor C2, and the capacitor C2 mono- terminates the negative of the diode D1
Pole, other end ground connection.
Constant current driver circuit for LED with an automatic light meter further includes sampling module 105, and sampling module 105 includes sampling resistor Rset,
The one end sampling resistor Rset ground connection, the other end are the output end of the sampling module 105.
Light sensation module 104 includes light sensor U3, power end, ground terminal, the output end pair of the light sensor U3
It should be power end, ground terminal and the output end of the light sensation module 104.
Based on above-mentioned all embodiments, the working principle of constant current driver circuit for LED with an automatic light meter is as follows:
Input power is output to divider resistance R1, capacitor C1 and inductance L1.
Conducting circuit, inductance L1 storage are constituted after inductance L1 input power with the switch terminals SW of chip TPS61500 and ground connection
Energy, and power via capacitor C2 to series LED lamp group.
Microcontroller U2, as micro-control are given in output after divider resistance R1 and voltage-stabiliser tube ZD1 divides the pressure drop of input power
Device U2 processed provides operating voltage.Microcontroller U2 receives 3V operating voltage and starts to work, and according to preset crystal oscillator Y1
Rate-adaptive pacemaker duty ratio corresponding burst modem signal to chip TPS61500 enable end.
The frequency and duty ratio of burst modem signal determine the output electric current of chip TPS61500.Therefore, microcontroller
Device U2 can change the output size of current of chip TPS61500.The brightness of series LED lamp group can thus be changed.Further
The switch terminals SW on ground, chip TPS61500 connects series LED lamp group.The brightness of series LED lamp group is determined by constant current operation electric current Iled
It is fixed.Chip TPS61500 is before no burst modem signal for receiving microcontroller U2, the switch terminals of chip TPS61500
SW output electric current can be preset.
Specifically, electric current Iled=V of series LED lamp groupFB/R3；VFBGenerally take 200mV.Therefore, it is determined in electric current Iled
It afterwards, can be in input power further according to the output end voltage Vout(of the drop requirements setting chip TPS61500 of series LED lamp group
It is set between 38V).After Vout is determined, the size and working frequency Fs of inductance L1 can be calculated.Generally using as follows
Formula calculates.Vout=(Vin*(ILIM-Ip/ 2) * η)/Iled；Wherein, Vin is input supply voltage, and ILIM is overcurrent
Value can use 4A, and η is efficiency, and can use 88%, Ip is inductance ripple wind peak value, and the inverse of Ip can be released by formula: 1/Ip=L*Fs*
(1/(Vout+Vf-Vin)+1/Vin), Vf is the forward voltage of diode D1, takes 0.4V.Inductance L1 value is in 4.7uH to 47uH
Between, between Fs value 160KHz to 2600KHz.
After inductance L1 and working frequency Fs is determined, change the duty of the burst modem signal of microcontroller U2 output
Than, it will be able to change the output electric current of chip TPS61500, and then control the electric current of series LED lamp group, to reach adjusting string
Join the effect of LED light group brightness.
Sampling resistor Rset detects the size of current in series LED lamp group, and in the form of voltage through chip TPS61500's
Feedback end FB feeds back to the control loop in chip TPS61500.When the upper voltage of feedback end FB reaches 200mV, chip
Switching tube in TPS61500 is opened, and the electric current in series LED lamp group no longer increases, inductance L1 storage capacity again.Therefore, it goes here and there
The maximum of connection LED light group is determined by sampling resistor Rset.
The burst modem signal of microcontroller U2 output, in largest duty cycle, the electric current in series LED lamp group is most
Greatly, when the duty ratio of burst modem signal reduces, the electric current in series LED lamp group also reduces.
Light sensor U3 incudes the brightness of series LED lamp group, and is that electric signal is exported to micro- by the brightness transition of induction
The duty ratio of controller U2, microcontroller U2 the burst modem signal that feedback signal change exports based on the received, so that
The electric current that constant-current driven module 103 is output to series LED lamp group changes, and then reaches control series LED lamp group and be in normal light
Strong effect.
The value range of capacitor C2 is between 4.7uF to 10uF.It can use different capacitors to be debugged, it can also be by following
Formula calculates: Cout=(Vout-Vin) * Iled/Vout*FS*Vripple. wherein Vripple be output ripple peak peak
Value can be calculated by following formula: Vripple=Iled*RESR。RESRValue look into the specifications of selected capacitor.
Above-mentioned constant current driver circuit for LED with an automatic light meter is used to provide work electricity for light-adjusting module 102 by division module 101
Pressure, so that light-adjusting module 102 exports burst modem signal to constant-current driven module 103, so as to change constant current driving
The size of current that module 103 exports.And then the series LED lamp group connecting with 103 output end of constant-current driven module can be controlled
Input current, therefore change the light emission luminance of series LED lamp group.Meanwhile light sensation module 104 is for incuding series LED lamp group
Brightness makes the light-adjusting module 102 change impulse modulation solution when the brightness of series LED lamp group is below or above specified light intensity
The duty ratio of signal is adjusted, to change the output electric current of constant-current driven module 103, the brightness of series LED lamp group is made to be in specified
Light intensity.
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 (7)
1. a kind of constant current driver circuit for LED with an automatic light meter, which is characterized in that including light-adjusting module, light sensation module, division module and
Constant-current driven module；
The power supply of the light-adjusting module terminates the output end of the division module, output terminates the enabled of the constant-current driven module
The input at end, the division module terminates input power；The power supply termination input power of the constant-current driven module, ground connection termination
The anode on ground, output termination series LED lamp group, the cathode of the series LED lamp group connect the feedback end of the constant-current driven module,
The power supply of the light sensation module terminates the output end of the division module, output terminates the feedback end of the light-adjusting module, ground connection
End ground connection；
The division module is used to provide rated operational voltage, the light-adjusting module for the light-adjusting module and the light sensation module
For exporting burst modem signal to the constant-current driven module, the constant-current driven module is according to the impulse modulation solution
Signal control output size of current is adjusted, the light sensation module is used to incude the brightness of the series LED lamp group and feeds back to described
Light-adjusting module, the light-adjusting module feed back the burst modem signal of brightness adjustment output based on the received, make the constant current
The brightness that drive module controls the series LED lamp group is in specified light intensity；
The light sensation module includes light sensor U3, and power end, ground terminal, the output end of the light sensor U3 corresponds to
Power end, ground terminal and the output end of the light sensation module；
The light-adjusting module includes microcontroller U2, divider resistance R2 and crystal oscillator Y1；
The crystal oscillator Y1 is connected between the end XO of microcontroller U2 and the end XI, the power end of the microcontroller U2,
Feedback end RSI and output end SDO corresponds to the power end, feedback end and output end of the light-adjusting module, the divider resistance R2
The output end of the one termination division module, the resetting end of another termination microcontroller U2.
2. constant current driver circuit for LED with an automatic light meter according to claim 1, which is characterized in that the division module includes
Divider resistance R1, voltage-stabiliser tube ZD1 and electrolytic capacitor C4；
The divider resistance R1 mono- terminates input power, the cathode of another termination voltage-stabiliser tube ZD1, the anode of the voltage-stabiliser tube ZD1
Ground connection, the electrolytic capacitor C4 are in parallel with the voltage-stabiliser tube ZD1, wherein the anode of the electrolytic capacitor C4 connects the voltage-stabiliser tube
The points of common connection of the cathode of ZD1, the divider resistance R1 and the voltage-stabiliser tube ZD1 are the output end of the division module.
3. constant current driver circuit for LED with an automatic light meter according to claim 1, which is characterized in that it further include capacitor C1, it is described
Capacitor C1 mono- terminates input power, other end ground connection.
4. constant current driver circuit for LED with an automatic light meter according to claim 1, which is characterized in that further include diode D1, institute
The anode for stating diode D1 connects the output end of the constant-current driven module, and the cathode of the diode D1 connects the series LED lamp
The anode of group.
5. constant current driver circuit for LED with an automatic light meter according to claim 4, which is characterized in that it further include capacitor C2, it is described
Capacitor C2 mono- terminates the cathode of the diode D1, other end ground connection.
6. constant current driver circuit for LED with an automatic light meter according to claim 1, which is characterized in that it further include sampling module, institute
Stating sampling module includes sampling resistor Rset, and the one end sampling resistor Rset ground connection, the other end is the defeated of the sampling module
Outlet.
7. constant current driver circuit for LED with an automatic light meter according to claim 6, which is characterized in that the constant-current driven module
Including chip TPS61161A, inductance L1, capacitor C3；
The inductance L1 mono- terminates input power, the switch terminals of another termination chip TPS61161A, the chip
The input termination input power of TPS61161A, feedback terminate the output end of the sampling module, the enabled termination light-adjusting module
Output end, ground terminal ground connection；The capacitor C3 mono- terminates the common end of the chip TPS61161A, other end ground connection.
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| CN201410004096.9A CN104768271B (en) | 2014-01-02 | 2014-01-02 | Constant current driver circuit for LED with an automatic light meter |
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| CN201410004096.9A CN104768271B (en) | 2014-01-02 | 2014-01-02 | Constant current driver circuit for LED with an automatic light meter |
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| CN104768271B true CN104768271B (en) | 2019-10-25 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2016125334A1 (en) * | 2015-02-04 | 2016-08-11 | オリンパス株式会社 | Endoscope device |
| CN109275235A (en) * | 2018-09-11 | 2019-01-25 | 浙江理工大学 | A kind of commercial vehicle interior light light-dimming method |
| CN109121248A (en) * | 2018-09-11 | 2019-01-01 | 蒋琳 | A kind of illuminating lamp for inside of automobile |
| CN114170971A (en) * | 2021-11-05 | 2022-03-11 | 惠州Tcl移动通信有限公司 | Filtering backlight circuit and mobile terminal |
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