CN104768271A - Automatic dimming LED constant-current driving circuit - Google Patents
Automatic dimming LED constant-current driving circuit Download PDFInfo
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Abstract
Provided is an automatic dimming LED constant-current driving circuit. Working voltage is provided for a dimming module by a voltage dividing module to enable the diming module to output a pulse modulation and demodulation signal to a constant-current driving module so as to change the magnitude of current output by the constant-current driving module. Further, the input current of a series LED lamp group connected with the output end of the constant-current driving module can be controlled, and the lighting brightness of the series LED lamp group can be changed. Meanwhile, a light sensing module is used for sensing the brightness of the series LED lamp group, and making the dimming module change the duty ratio of the pulse modulation and demodulation signal when the brightness of the series LED lamp group is lower or higher than the nominal light intensity, so as to change the output current of the constant-current driving module and make the brightness of the series LED lamp group at the nominal light intensity.
Description
Technical field
The present invention relates to constant current driver circuit for LED, particularly relate to a kind of constant current driver circuit for LED with an automatic light meter simple to operation.
Background technology
LED is widely used as light source, has also occurred various LED drive circuit thereupon.Because LED self is harsher to operating voltage requirement, overtension is too low all can cause LED operating current fluctuation, so the general type of drive that will adopt constant current voltage limiting to LED.Thus, when LED is as current mode operating load, the electric current flowing through LED must ensure within rated current.In the low-voltage place of direct current, the integrated high-frequency model design LED of integration that adopts drives more at present, but these type of drive are all firm powers to be exported, can not regulate power output, and then intensity of illumination can not regulate, bring serious inconvenience to user.
Summary of the invention
Based on this, be 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, comprises light-adjusting module, light sensation module, division module and constant-current driven module;
The output of division module described in the power supply termination of described light-adjusting module, export the Enable Pin of constant-current driven module described in termination, the input termination input power of described division module; The power supply termination input power of described constant-current driven module, earth terminal ground connection, export the positive pole of termination series LED lamp group, the negative pole of described series LED lamp group connects the feedback end of described constant-current driven module, the output of division module described in the power supply termination of described light sensation module, the feedback end exporting light-adjusting module described in termination, earth terminal ground connection;
Described division module is used for providing rated operational voltage for described light-adjusting module and described light sensation module, described light-adjusting module is used for exporting burst modem signal to described constant-current driven module, described constant-current driven module is according to described burst modem signal controlling output current size, described light sensation module is for responding to the brightness of described series LED lamp group and feeding back to described light-adjusting module, the burst modem signal that described light-adjusting module exports according to the feedback brightness adjustment received, the brightness making described constant-current driven module control described series LED lamp group is in specified light intensity.
Wherein in an embodiment, described light-adjusting module comprises microcontroller U2, divider resistance R2 and crystal oscillator Y1;
Described crystal oscillator Y1 is connected between the XO end of microcontroller U2 and XI end, the power end of described microcontroller U2, feedback end RSI and output SDO correspond to the power end of described light-adjusting module, feedback end and output, the output of division module described in described divider resistance R2 mono-termination, the replacement end of microcontroller U2 described in another termination.
Wherein in an embodiment, described division module comprises divider resistance R1, voltage-stabiliser tube ZD1 and electrochemical capacitor C4;
Described divider resistance R1 mono-termination input power, the negative pole of another termination voltage-stabiliser tube ZD1, the minus earth of described voltage-stabiliser tube ZD1, described electrochemical capacitor C4 is in parallel with described voltage-stabiliser tube ZD1, wherein, the positive pole of described electrochemical capacitor C4 connects the negative pole of described voltage-stabiliser tube ZD1, and the points of common connection of described divider resistance R1 and described voltage-stabiliser tube ZD1 is the output of described division module.
Wherein in an embodiment, described constant-current driven module comprises chip TPS61161A, inductance L 1, electric capacity C3;
Described inductance L 1 one termination input power, the switch terminals of chip TPS61161A described in another termination, the output of light-adjusting module described in the input termination input power of described chip TPS61161A, the output feeding back sampling module described in termination, enable termination, earth terminal ground connection; The common port of chip TPS61161A described in described electric capacity C3 mono-termination, other end ground connection.
Wherein in an embodiment, also comprise electric capacity C1, described electric capacity C1 mono-termination input power, other end ground connection.
Wherein in an embodiment, also comprise diode D1, the positive pole of described diode D1 connects the output of described constant-current driven module, and the negative pole of described diode D1 connects the positive pole of described series LED lamp group.
Wherein in an embodiment, also comprise electric capacity C2, the negative pole of diode D1 described in described electric capacity C2 mono-termination, other end ground connection.
Wherein in an embodiment, also comprise sampling module, described sampling module comprises sampling resistor Rset, and described sampling resistor Rset one end ground connection, the other end is the output of described sampling module.
Wherein in an embodiment, described light sensation module comprises light sensor U3, and the power end of described light sensor U3, earth terminal, output correspond to the power end of described light sensation module, earth terminal and output.
Above-mentioned constant current driver circuit for LED with an automatic light meter is used for providing operating voltage for light-adjusting module by division module, makes light-adjusting module export burst modem signal to constant-current driven module, thus can change the size of current of constant-current driven module output.And then the input current of the series LED lamp group be connected with constant-current driven module output can be controlled, therefore change the luminosity of series LED lamp group.Simultaneously, light sensation module is for responding to the brightness of series LED lamp group, when the brightness of series LED lamp group is below or above specified light intensity, described light-adjusting module is made to change the duty ratio of burst modem signal, thus change the output current of constant-current driven module, make the brightness of series LED lamp group be in specified light intensity.
Accompanying drawing explanation
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.
Embodiment
As shown in Figure 1, be 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, comprises light-adjusting module 102, division module 101, light sensation module 104 and constant-current driven module 103.
The output of division module 101 described in the power supply termination of described light-adjusting module 102, export the Enable Pin of constant-current driven module 103 described in termination, the input termination input power of described division module 101; The power supply termination input power of described constant-current driven module 103, earth terminal ground connection, export the positive pole of termination series LED lamp group, the negative pole of described series LED lamp group connects the feedback end of described constant-current driven module 103, the output of the power supply termination division module 101 of described light sensation module 104, the feedback end exporting light-adjusting module 102 described in termination, earth terminal ground connection.
Described division module 101 is for providing rated operational voltage for described light-adjusting module 102 and described light sensation module 104, described light-adjusting module 102 is for exporting burst modem signal to described constant-current driven module 103, described constant-current driven module 103 is according to described burst modem signal controlling output current size, described light sensation module 104 is for responding to the brightness of described series LED lamp group and feeding back to described light-adjusting module 102, the burst modem signal that described light-adjusting module 102 exports according to the feedback brightness adjustment received, the brightness making described constant-current driven module 103 control described series LED lamp group is in specified light intensity.。
Division module 101, for the voltage got from input power is exported to light-adjusting module 102 and light sensation module 104, makes light-adjusting module 102 and light sensation module 104 normally work, and exports burst modem signal to constant-current driven module 103.
Constant-current driven module 103 is lighted for driving series LED lamp group, and changes output current size according to the burst modem signal received.
Light-adjusting module 102 for exporting burst modem signal to constant-current driven module 103, thus makes constant-current driven module 103 change output current, and then reaches the electric current controlling series LED lamp group.
Light sensation module 104 is for responding to the brightness of series LED lamp group, and feed back to light-adjusting module 102, the duty ratio of the burst modem signal that light-adjusting module 102 is exported changes, thus the electric current that can control constant-current driven module 103 output remains unchanged, and then reach the effect that the brightness controlling series LED lamp group is in specified light intensity.
As shown in Figure 2, be the schematic diagram of constant current driver circuit for LED with an automatic light meter.
Light-adjusting module 102 comprises microcontroller U2, divider resistance R2 and crystal oscillator Y1.
Described crystal oscillator Y1 is connected between the XO end of microcontroller U2 and XI end, the power end of described microcontroller U2, feedback end RSI and output SDO correspond to the power end of described light-adjusting module 102, feedback end and output, the output of division module 101 described in described divider resistance R2 mono-termination, the replacement end of microcontroller U2 described in another termination.
Division module 101 comprises divider resistance R1, voltage-stabiliser tube ZD1 and electrochemical capacitor C4.
Described divider resistance R1 mono-termination input power, the negative pole of another termination voltage-stabiliser tube ZD1, the minus earth of described voltage-stabiliser tube ZD1, described electrochemical capacitor C4 is in parallel with described voltage-stabiliser tube ZD1, wherein, the positive pole of described electrochemical capacitor C4 connects the negative pole of described voltage-stabiliser tube ZD1, and the points of common connection of described divider resistance R1 and described voltage-stabiliser tube ZD1 is the output of described division module.
Constant-current driven module 103 comprises chip TPS61161A, inductance L 1, electric capacity C3.
Described inductance L 1 one termination input power, the switch terminals of chip TPS61161A described in another termination, the output of light-adjusting module 102 described in the input termination input power of described chip TPS61161A, the output feeding back sampling module 104 described in termination, enable termination, earth terminal ground connection; The common port of chip TPS61161A described in described electric capacity C3 mono-termination, other end ground connection.
Constant current driver circuit for LED with an automatic light meter also comprises electric capacity C1, described electric capacity C1 mono-termination input power, other end ground connection.
Constant current driver circuit for LED with an automatic light meter also comprises diode D1, and the positive pole of described diode D1 connects the output of described constant-current driven module 103, and the negative pole of described diode D1 connects the positive pole of described series LED lamp group.
Constant current driver circuit for LED with an automatic light meter also comprises electric capacity C2, the negative pole of diode D1 described in described electric capacity C2 mono-termination, other end ground connection.
Constant current driver circuit for LED with an automatic light meter also comprises sampling module 105, and sampling module 105 comprises sampling resistor Rset, and described sampling resistor Rset one end ground connection, the other end is the output of described sampling module 105.
Light sensation module 104 comprises light sensor U3, and the power end of described light sensor U3, earth terminal, output correspond to the power end of described light sensation module 104, earth terminal and output.
Based on above-mentioned all embodiments, the operation principle of constant current driver circuit for LED with an automatic light meter is as follows:
Input power outputs to divider resistance R1, electric capacity C1 and inductance L 1.
Form conducting loop with the switch terminals SW of chip TPS61500 and ground connection after inductance L 1 input power, inductance L 1 stored energy, and power to series LED lamp group via electric capacity C2.
Divider resistance R1 and voltage-stabiliser tube ZD1 exports to microcontroller U2 by after the pressure drop dividing potential drop of input power, is microcontroller U2 and provides operating voltage.Microcontroller U2 receives 3V operating voltage and starts working, and according to the burst modem signal of the rate-adaptive pacemaker duty ratio corresponding of the crystal oscillator Y1 preset to the Enable Pin of chip TPS61500.
The frequency of burst modem signal and duty ratio determine the output current of chip TPS61500.Therefore, microcontroller U2 can change the output current size of chip TPS61500.Thus the brightness of series LED lamp group can be changed.Further, the switch terminals SW of chip TPS61500 connects series LED lamp group.The brightness of series LED lamp group is determined by constant current operation electric current I led.Chip TPS61500 is before the burst modem signal not receiving microcontroller U2, and the switch terminals SW output current of chip TPS61500 can preset.
Concrete, the electric current I led=V of series LED lamp group
fB/ R3; V
fBgenerally get 200mV.Therefore, after electric current I led determines, then can set between input power to 38V according to the output end voltage Vout(of the drop requirements setting chip TPS61500 of series LED lamp group).After Vout determines, the size of inductance L 1 and operating frequency Fs just can calculate.The following formulae discovery of general employing.Vout=(Vin*(I
lIM-I
p/ 2) * η)/Iled; Wherein, Vin is input supply voltage, and ILIM is overcurrent value, desirable 4A, η is efficiency, and desirable 88%, Ip is inductance ripple wind peak value, 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, gets 0.4V.Inductance L 1 value between 4.7uH to 47uH, between Fs value 160KHz to 2600KHz.
After inductance L 1 and operating frequency Fs are determined, change the duty ratio of the burst modem signal that microcontroller U2 exports, just can change the output current of chip TPS61500, and then control the electric current of series LED lamp group, thus reach the effect regulating the brightness of series LED lamp group.
Sampling resistor Rset detects the size of current in series LED lamp group, and feeds back to the control loop in chip TPS61500 in the form of voltage through the feedback end FB of chip TPS61500.When the upper voltage of feedback end FB reaches 200mV, the switching tube in chip TPS61500 is opened, and the electric current in series LED lamp group no longer increases, inductance L 1 storage capacity again.Therefore, the maximum of series LED lamp group is determined by sampling resistor Rset.
The burst modem signal that microcontroller U2 exports, when duty ratio is maximum, the electric current in series LED lamp group is maximum, and when the duty ratio of burst modem signal reduces, the electric current in series LED lamp group also reduces.
Light sensor U3 responds to the brightness of series LED lamp group, and be that the signal of telecommunication exports to microcontroller U2 by the brightness transition of induction, microcontroller U2 changes the duty ratio of the burst modem signal exported according to the feedback signal received, the electric current making constant-current driven module 103 output to series LED lamp group changes, and then reaches the effect that control series LED lamp group is in specified light intensity.
The span of electric capacity C2 is between 4.7uF to 10uF.Desirable different electric capacity is debugged, also can by formulae discovery below out: Cout=(Vout-Vin) * Iled/Vout*FS*Vripple. wherein Vripple is the peak-to-peak value of output ripple. and can by following formulae discovery: Vripple=Iled*R
eSR.R
eSRvalue look into the specifications of selected electric capacity.
Above-mentioned constant current driver circuit for LED with an automatic light meter by division module 101 for providing operating voltage for light-adjusting module 102, make light-adjusting module 102 export burst modem signal to constant-current driven module 103, thus the size of current of constant-current driven module 103 output can be changed.And then the input current of the series LED lamp group be connected with constant-current driven module 103 output can be controlled, therefore change the luminosity of series LED lamp group.Simultaneously, light sensation module 104 is for responding to the brightness of series LED lamp group, when the brightness of series LED lamp group is below or above specified light intensity, described light-adjusting module 102 is made to change the duty ratio of burst modem signal, thus change the output current of constant-current driven module 103, make the brightness of series LED lamp group be in specified light intensity.
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 (9)
1. a constant current driver circuit for LED with an automatic light meter, is characterized in that, comprises light-adjusting module, light sensation module, division module and constant-current driven module;
The output of division module described in the power supply termination of described light-adjusting module, export the Enable Pin of constant-current driven module described in termination, the input termination input power of described division module; The power supply termination input power of described constant-current driven module, earth terminal ground connection, export the positive pole of termination series LED lamp group, the negative pole of described series LED lamp group connects the feedback end of described constant-current driven module, the output of division module described in the power supply termination of described light sensation module, the feedback end exporting light-adjusting module described in termination, earth terminal ground connection;
Described division module is used for providing rated operational voltage for described light-adjusting module and described light sensation module, described light-adjusting module is used for exporting burst modem signal to described constant-current driven module, described constant-current driven module is according to described burst modem signal controlling output current size, described light sensation module is for responding to the brightness of described series LED lamp group and feeding back to described light-adjusting module, the burst modem signal that described light-adjusting module exports according to the feedback brightness adjustment received, the brightness making described constant-current driven module control described series LED lamp group is in specified light intensity.
2. constant current driver circuit for LED with an automatic light meter according to claim 1, is characterized in that, described light-adjusting module comprises microcontroller U2, divider resistance R2 and crystal oscillator Y1;
Described crystal oscillator Y1 is connected between the XO end of microcontroller U2 and XI end, the power end of described microcontroller U2, feedback end RSI and output SDO correspond to the power end of described light-adjusting module, feedback end and output, the output of division module described in described divider resistance R2 mono-termination, the replacement end of microcontroller U2 described in another termination.
3. constant current driver circuit for LED with an automatic light meter according to claim 1, is characterized in that, described division module comprises divider resistance R1, voltage-stabiliser tube ZD1 and electrochemical capacitor C4;
Described divider resistance R1 mono-termination input power, the negative pole of another termination voltage-stabiliser tube ZD1, the minus earth of described voltage-stabiliser tube ZD1, described electrochemical capacitor C4 is in parallel with described voltage-stabiliser tube ZD1, wherein, the positive pole of described electrochemical capacitor C4 connects the negative pole of described voltage-stabiliser tube ZD1, and the points of common connection of described divider resistance R1 and described voltage-stabiliser tube ZD1 is the output of described division module.
4. constant current driver circuit for LED with an automatic light meter according to claim 1, is characterized in that, described constant-current driven module comprises chip TPS61161A, inductance L 1, electric capacity C3;
Described inductance L 1 one termination input power, the switch terminals of chip TPS61161A described in another termination, the output of light-adjusting module described in the input termination input power of described chip TPS61161A, the output feeding back sampling module described in termination, enable termination, earth terminal ground connection; The common port of chip TPS61161A described in described electric capacity C3 mono-termination, other end ground connection.
5. constant current driver circuit for LED with an automatic light meter according to claim 1, is characterized in that, also comprises electric capacity C1, described electric capacity C1 mono-termination input power, other end ground connection.
6. constant current driver circuit for LED with an automatic light meter according to claim 1, is characterized in that, also comprises diode D1, and the positive pole of described diode D1 connects the output of described constant-current driven module, and the negative pole of described diode D1 connects the positive pole of described series LED lamp group.
7. constant current driver circuit for LED with an automatic light meter according to claim 6, is characterized in that, also comprises electric capacity C2, the negative pole of diode D1 described in described electric capacity C2 mono-termination, other end ground connection.
8. constant current driver circuit for LED with an automatic light meter according to claim 1, is characterized in that, also comprise sampling module, and described sampling module comprises sampling resistor Rset, and described sampling resistor Rset one end ground connection, the other end is the output of described sampling module.
9. constant current driver circuit for LED with an automatic light meter according to claim 1, it is characterized in that, described light sensation module comprises light sensor U3, and the power end of described light sensor U3, earth terminal, output correspond to the power end of described light sensation module, earth terminal and output.
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| CN104768271B (en) | 2019-10-25 |
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