CN104768262A - Boost dimming LED constant-current driving circuit - Google Patents
Boost dimming LED constant-current driving circuit Download PDFInfo
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- CN104768262A CN104768262A CN201410002143.6A CN201410002143A CN104768262A CN 104768262 A CN104768262 A CN 104768262A CN 201410002143 A CN201410002143 A CN 201410002143A CN 104768262 A CN104768262 A CN 104768262A
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- 238000005070 sampling Methods 0.000 claims abstract description 38
- 238000004146 energy storage Methods 0.000 claims abstract description 24
- 230000001681 protective effect Effects 0.000 claims description 19
- 239000003381 stabilizer Substances 0.000 claims description 19
- 230000009466 transformation Effects 0.000 claims description 12
- 230000001276 controlling effect Effects 0.000 description 4
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Abstract
Provided is a boost dimming LED constant-current driving circuit. An LED is lighted up under the drive of an energy storage module and a boost driving module. A dimming module outputs a pulse modulation and demodulation signal to the boost driving module to change the magnitude of current output by the boost driving module. A sampling module is used for sampling the current in a series LED lamp group, and feeds the current back to the boost driving module to enable the boost driving module to adjust the current of the series LED lamp group. Therefore, the input current of the series LED lamp group connected with the output end of the boost driving module is changed, and the lighting brightness of the series LED lamp group is changed.
Description
Technical field
The present invention relates to constant current driver circuit for LED, particularly relate to a kind of boosting Dimmable LED constant-current drive circuit with many frequency modulated lights photograph intensity adjustment function.
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 that providing a kind of has the boosting Dimmable LED constant-current drive circuit of many frequency modulated lights according to intensity adjustment function.
A kind of boosting Dimmable LED constant-current drive circuit, comprises light-adjusting module, energy-storage module, sampling module and boosting driver module;
The power supply termination input power of described light-adjusting module, the Enable Pin exporting the driver module that to boost described in termination, earth terminal ground connection; The negative pole of the input termination input power of described boosting driver module, earth terminal ground connection, feedback termination series LED lamp group, first switch terminals of described boosting driver module and second switch end connect the positive pole of series LED lamp group simultaneously, the negative pole of described series LED lamp group is also connected with the input of described sampling module, the output head grounding of described sampling module; The input termination input power of described energy-storage module, export the positive pole of series LED lamp group described in termination;
Described energy-storage module is used for the energy storage when the first switch terminals of described boosting driver module and second switch end are opened, and power to described series LED lamp group, when the first switch terminals and the closedown of second switch end of described boosting driver module, power to described series LED lamp group; Described light-adjusting module is used for exporting burst modem signal to described boosting driver module, described boosting driver module according to described burst modem signal controlling output current size, described sampling module for described series LED lamp group of sampling electric current and export to described boosting driver module.
Wherein in an embodiment, also comprise the voltage transformation module of the operating voltage for input power being converted to described light-adjusting module, the input termination input power of described voltage transformation module, the power end exporting light-adjusting module described in termination, earth terminal ground connection.
Wherein in an embodiment, described voltage transformation module comprises divider resistance R4, voltage-stabiliser tube ZD1, electric capacity C1 and electric capacity C5;
Described divider resistance R4 mono-termination input power, the negative pole of voltage-stabiliser tube ZD1 described in another termination, the plus earth of described voltage-stabiliser tube ZD1, described electric capacity C5 is parallel to the two ends of described voltage-stabiliser tube ZD1, wherein, the positive pole of described electric capacity C5 connects the negative pole of described voltage-stabiliser tube ZD1, and the points of common connection of described divider resistance R4 and described voltage-stabiliser tube ZD1 negative pole is the output of described voltage transformation module, described electric capacity C1 mono-termination input power supply, other end ground connection.
Wherein in an embodiment, described light-adjusting module comprises chip IC M7555, electric capacity C6, divider resistance RA and divider resistance RB;
Described divider resistance RA and described divider resistance RB is series between the power end of described chip IC M7555 and threshold value end, the points of common connection of described divider resistance RA and described divider resistance RB connects the discharge end of described chip IC M7555, the trigger end of chip IC M7555 described in one termination of described electric capacity C6, other end ground connection, the trigger end of described chip IC M7555 is connected with threshold value end.
Wherein in an embodiment, described energy-storage module comprises inductance L 1; The two ends of described inductance L 1 correspond to input and the output of described energy-storage module.
Wherein in an embodiment, described boosting driver module comprises chip TPS61500, electric capacity C4, electric capacity C3 and divider resistance R5;
The sampling end of chip TPS61500 described in one termination of described divider resistance R5, other end ground connection, the common port of chip TPS61500 described in described electric capacity C4 mono-termination, other end ground connection, the frequency modulation end of chip TPS61500 described in described electric capacity C3 mono-termination, other end ground connection;
The Enable Pin of described chip TPS61500, input, feedback end, the first switch terminals and second switch end correspond to the Enable Pin of described boosting driver module, input, feedback end, the first switch terminals and second switch end.
Wherein in an embodiment, described sampling module comprises sampling resistor R3, and the two ends of described sampling resistor R3 correspond to input and the output of described sampling module.
Wherein in an embodiment; also comprise overvoltage protective module; to boost described in the input termination of described overvoltage protective module the overvoltage test side of driver module, the positive pole of series LED lamp group described in the output termination of described overvoltage protective module, the earth terminal ground connection of described overvoltage protective module.
Wherein in an embodiment, described overvoltage protective module comprises divider resistance R1 and divider resistance R2;
Between the positive pole that described divider resistance R1 and described divider resistance R2 is series at described series LED lamp group and ground connection, the points of common connection of described divider resistance R1 and described divider resistance R2 is the input of described overvoltage protective module.
Wherein in an embodiment, also comprise diode D1, the negative pole of described diode D1 connects the positive pole of described series LED lamp group, and the positive pole of described diode D1 connects the output of described energy-storage module.
Above-mentioned boosting Dimmable LED constant-current drive circuit is lighted by energy-storage module and boosting driver module driving LED.And light-adjusting module exports burst modem signal to boosting driver module, the size of current that boosting driver module is exported changes.The electric current of sampling module for sampling in series LED lamp group simultaneously, and feed back to boosting driver module, boosting driver module is adjusted the electric current in series LED lamp group.Therefore, change the input current of the series LED lamp group that output is connected with boosting driver module, and then change the luminosity of series LED lamp group.
Accompanying drawing explanation
Fig. 1 is the module map of boosting Dimmable LED constant-current drive circuit;
Fig. 2 is the schematic diagram of boosting Dimmable LED constant-current drive circuit.
Embodiment
As shown in Figure 1, be a kind of module map of the Dimmable LED constant-current drive circuit that boosts.
A kind of boosting Dimmable LED constant-current drive circuit, comprises light-adjusting module 103, energy-storage module 101, sampling module 104 and boosting driver module 102.
The power supply termination operating voltage of described light-adjusting module 103, the Enable Pin exporting the driver module 102 that to boost described in termination, earth terminal ground connection; The negative pole of the input termination input power of described boosting driver module 102, earth terminal ground connection, feedback termination series LED lamp group, first switch terminals of described boosting driver module 102 and second switch end connect the positive pole of series LED lamp group simultaneously, the negative pole of described series LED lamp group is also connected with the input of described sampling module 104, the output head grounding of described sampling module 104; The input termination input power of described energy-storage module 101, export the positive pole of series LED lamp group described in termination.
Described energy-storage module 101 is for the energy storage when the first switch terminals of described boosting driver module 102 and second switch end are opened, and power to described series LED lamp group, when the first switch terminals and the closedown of second switch end of described boosting driver module 102, power to described series LED lamp group; Described light-adjusting module 103 is for exporting burst modem signal to described boosting driver module 102, described boosting driver module 102 according to described burst modem signal controlling output current size, described sampling module 104 for described series LED lamp group of sampling electric current and export to described boosting driver module 102.
During boosting Dimmable LED constant-current drive circuit access power supply, accumulator 101 starts charging, and powers to load in series LED group.After accumulator 101 is full of electricity, when the first switch terminals and the closedown of second switch end of the driver module 102 that boosts, namely under the effect of back-emf, continue to power to load in series LED group.
Boosting driver module 102 for driving lighting of series LED lamp group, and changes the input pressure drop of series LED lamp group.Concrete, boosting driver module 102, according to the burst modem signal controlling output current received, namely changes the electric current of series LED lamp group, thus changes the brightness of series LED lamp group.
Light-adjusting module 103 for exporting burst modem signal to boosting driver module 102, thus makes boosting driver module 102 change output current, and then reaches the electric current controlling series LED lamp group.
The electric current of sampling module 104 for sampling in series LED lamp group, and feed back to boosting driver module 102, the electric current that boosting driver module 102 is exported can not exceed preset value, avoids the electric current in series LED lamp group excessive and damages series LED lamp group.
Incorporated by reference to Fig. 2.
Boosting Dimmable LED constant-current drive circuit also comprises the voltage transformation module 105 of the operating voltage for input power being converted to described light-adjusting module 103, the input termination input power of described voltage transformation module 105, the power end exporting light-adjusting module 103 described in termination, earth terminal ground connection.
Voltage transformation module 105 comprises divider resistance R4, voltage-stabiliser tube ZD1, electric capacity C1 and electric capacity C5.
Described divider resistance R4 mono-termination input power, the negative pole of voltage-stabiliser tube ZD1 described in another termination, the plus earth of described voltage-stabiliser tube ZD1, described electric capacity C5 is parallel to the two ends of described voltage-stabiliser tube ZD1, wherein, the positive pole of described electric capacity C5 connects the negative pole of described voltage-stabiliser tube ZD1, and the points of common connection of described divider resistance R4 and described voltage-stabiliser tube ZD1 negative pole is the output of described voltage transformation module 105, described electric capacity C1 mono-termination input power supply, other end ground connection.
Light-adjusting module 103 comprises chip IC M7555, electric capacity C6, divider resistance RA and divider resistance RB.
Described divider resistance RA and described divider resistance RB is series between the power end of described chip IC M7555 and threshold value end, the points of common connection of described divider resistance RA and described divider resistance RB connects the discharge end of described chip IC M7555, the trigger end of chip IC M7555 described in one termination of described electric capacity C6, other end ground connection, the trigger end of described chip IC M7555 is connected with threshold value end.
Energy-storage module 101 comprises inductance L 1; The two ends of described inductance L 1 correspond to input and the output of described energy-storage module 101.
Boosting driver module 102 comprises chip TPS61500, electric capacity C4, electric capacity C3 and divider resistance R5.
The sampling end of chip TPS61500 described in one termination of described divider resistance R5, other end ground connection, the common port of chip TPS61500 described in described electric capacity C4 mono-termination, other end ground connection, the frequency modulation end of chip TPS61500 described in described electric capacity C3 mono-termination, other end ground connection.
The Enable Pin of described chip TPS61500, input, feedback end, the first switch terminals and second switch end correspond to the Enable Pin of described boosting driver module, input, feedback end, the first switch terminals and second switch end.
Sampling module 104 comprises sampling resistor R3, and the two ends of described sampling resistor R3 correspond to input and the output of described sampling module 104.
Boosting Dimmable LED constant-current drive circuit also comprises overvoltage protective module 106; to boost described in the input termination of described overvoltage protective module 106 the overvoltage test side of driver module 102; the positive pole of series LED lamp group described in the output termination of described overvoltage protective module 106, the earth terminal ground connection of described overvoltage protective module 106.
Overvoltage protective module 106 comprises divider resistance R1 and divider resistance R2; Between the positive pole that described divider resistance R1 and described divider resistance R2 is series at described series LED lamp group and ground connection, the points of common connection of described divider resistance R1 and described divider resistance R2 is the input of described overvoltage protective module 103.
Boosting Dimmable LED constant-current drive circuit also comprises diode D1, and the negative pole of described diode D1 connects the positive pole of described series LED lamp group, and the positive pole of described diode D1 connects the output of described energy-storage module 101.
Based on above-mentioned all embodiments, the operation principle of boosting Dimmable LED constant-current drive circuit is as follows:
Input power is 2.9V-6V, forms conducting loop, inductance L 1 stored energy, and power to series LED lamp group via electric capacity C2 after inductance L 1 input power with the first switch terminals SW1 of chip TPS61500, second switch end SW2 and ground connection.
Input power is via the operating voltage providing 3V after divider resistance R4 and voltage-stabiliser tube ZD1 dividing potential drop, electric capacity C1 and electric capacity C5 filtering to chip IC M7555.Chip IC M7555 receives 3V operating voltage and starts working, and exports the burst modem signal of duty ratio corresponding to the Enable Pin of chip TPS61500 according to the resistance stating divider resistance RA and described divider resistance RB preset.Wherein, the size of divider resistance RA and divider resistance RB determines the duty ratio of burst modem signal.Specific formula for calculation is duty ratio D=RB/(RA+2RBA).The frequency of burst modem signal is determined by electric capacity C6, divider resistance RA1 and divider resistance RB1.Specific formula for calculation is f=1.46/(RA+2RBA) * C, wherein C is the capacitance of electric capacity C6.
The frequency of burst modem signal and duty ratio determine the output current of chip TPS61500.Therefore, chip IC M7555 can change the output current size of chip TPS61500.Thus the brightness of series LED lamp group can be changed.Further, the first switch terminals SW1 of chip TPS61500 and second switch end SW2 connects series LED lamp group after connecting.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 having receiving chip ICM7555, and the first switch terminals SW1 of chip TPS61500 and the output current of second switch end SW2 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 chip IC M7555 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.
The overvoltage threshold of overvoltage protective module 106 sets according to input power, if input power is 12V, then and overvoltage protection threshold Vovp=1.229V*(R1/R2+1).
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 boosting Dimmable LED constant-current drive circuit is lighted by energy-storage module 101 and boosting driver module 102 driving LED.And light-adjusting module 103 exports burst modem signal to boosting driver module 102, the size of current that boosting driver module 102 is exported changes.The electric current of sampling module 104 for sampling in series LED lamp group simultaneously, and feed back to boosting driver module 102, the electric current in boosting driver module 102 pairs of series LED lamp groups is adjusted.Therefore, change the input current of the series LED lamp group that output is connected with boosting driver module 102, and then change the luminosity of series LED lamp group.
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 (10)
1. boost a Dimmable LED constant-current drive circuit, it is characterized in that, comprise light-adjusting module, energy-storage module, sampling module and boosting driver module;
The power supply termination input power of described light-adjusting module, the Enable Pin exporting the driver module that to boost described in termination, earth terminal ground connection; The negative pole of the input termination input power of described boosting driver module, earth terminal ground connection, feedback termination series LED lamp group, first switch terminals of described boosting driver module and second switch end connect the positive pole of series LED lamp group simultaneously, the negative pole of described series LED lamp group is also connected with the input of described sampling module, the output head grounding of described sampling module; The input termination input power of described energy-storage module, export the positive pole of series LED lamp group described in termination;
Described energy-storage module is used for the energy storage when the first switch terminals of described boosting driver module and second switch end are opened, and power to described series LED lamp group, when the first switch terminals and the closedown of second switch end of described boosting driver module, power to described series LED lamp group; Described light-adjusting module is used for exporting burst modem signal to described boosting driver module, described boosting driver module according to described burst modem signal controlling output current size, described sampling module for described series LED lamp group of sampling electric current and export to described boosting driver module.
2. boosting Dimmable LED constant-current drive circuit according to claim 1, it is characterized in that, also comprise the voltage transformation module of the operating voltage for input power being converted to described light-adjusting module, the input termination input power of described voltage transformation module, the power end exporting light-adjusting module described in termination, earth terminal ground connection.
3. boosting Dimmable LED constant-current drive circuit according to claim 2, is characterized in that, described voltage transformation module comprises divider resistance R4, voltage-stabiliser tube ZD1, electric capacity C1 and electric capacity C5;
Described divider resistance R4 mono-termination input power, the negative pole of voltage-stabiliser tube ZD1 described in another termination, the plus earth of described voltage-stabiliser tube ZD1, described electric capacity C5 is parallel to the two ends of described voltage-stabiliser tube ZD1, wherein, the positive pole of described electric capacity C5 connects the negative pole of described voltage-stabiliser tube ZD1, and the points of common connection of described divider resistance R4 and described voltage-stabiliser tube ZD1 negative pole is the output of described voltage transformation module, described electric capacity C1 mono-termination input power supply, other end ground connection.
4. boosting Dimmable LED constant-current drive circuit according to claim 1, is characterized in that, described light-adjusting module comprises chip IC M7555, electric capacity C6, divider resistance RA and divider resistance RB;
Described divider resistance RA and described divider resistance RB is series between the power end of described chip IC M7555 and threshold value end, the points of common connection of described divider resistance RA and described divider resistance RB connects the discharge end of described chip IC M7555, the trigger end of chip IC M7555 described in one termination of described electric capacity C6, other end ground connection, the trigger end of described chip IC M7555 is connected with threshold value end.
5. boosting Dimmable LED constant-current drive circuit according to claim 1, is characterized in that, described energy-storage module comprises inductance L 1; The two ends of described inductance L 1 correspond to input and the output of described energy-storage module.
6. boosting Dimmable LED constant-current drive circuit according to claim 1, is characterized in that, described boosting driver module comprises chip TPS61500, electric capacity C4, electric capacity C3 and divider resistance R5;
The sampling end of chip TPS61500 described in one termination of described divider resistance R5, other end ground connection, the common port of chip TPS61500 described in described electric capacity C4 mono-termination, other end ground connection, the frequency modulation end of chip TPS61500 described in described electric capacity C3 mono-termination, other end ground connection;
The Enable Pin of described chip TPS61500, input, feedback end, the first switch terminals and second switch end correspond to the Enable Pin of described boosting driver module, input, feedback end, the first switch terminals and second switch end.
7. boosting Dimmable LED constant-current drive circuit according to claim 1, is characterized in that, described sampling module comprises sampling resistor R3, and the two ends of described sampling resistor R3 correspond to input and the output of described sampling module.
8. boosting Dimmable LED constant-current drive circuit according to claim 1; it is characterized in that; also comprise overvoltage protective module; to boost described in the input termination of described overvoltage protective module the overvoltage test side of driver module; the positive pole of series LED lamp group described in the output termination of described overvoltage protective module, the earth terminal ground connection of described overvoltage protective module.
9. boosting Dimmable LED constant-current drive circuit according to claim 8, is characterized in that, described overvoltage protective module comprises divider resistance R1 and divider resistance R2;
Between the positive pole that described divider resistance R1 and described divider resistance R2 is series at described series LED lamp group and ground connection, the points of common connection of described divider resistance R1 and described divider resistance R2 is the input of described overvoltage protective module.
10. boosting Dimmable LED constant-current drive circuit according to claim 1, is characterized in that, also comprises diode D1, and the negative pole of described diode D1 connects the positive pole of described series LED lamp group, and the positive pole of described diode D1 connects the output of described energy-storage module.
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| CN201410002143.6A CN104768262A (en) | 2014-01-02 | 2014-01-02 | Boost dimming LED constant-current driving circuit |
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| CN201410002143.6A CN104768262A (en) | 2014-01-02 | 2014-01-02 | Boost dimming LED constant-current driving circuit |
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| CN115002959B (en) * | 2022-05-23 | 2023-04-07 | 深圳市鸿远微思电子有限公司 | Digital dimming LED lamp driving circuit |
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Application publication date: 20150708 |