CN104768265A - High-power LED constant-current driving circuit - Google Patents
High-power LED constant-current driving circuit Download PDFInfo
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- CN104768265A CN104768265A CN201410002149.3A CN201410002149A CN104768265A CN 104768265 A CN104768265 A CN 104768265A CN 201410002149 A CN201410002149 A CN 201410002149A CN 104768265 A CN104768265 A CN 104768265A
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Abstract
A high-power LED constant-current driving circuit converts an input power supply into an enable signal through a voltage conversion module, and outputs the enable signal to a constant-current driving module. An energy storage module starts energy storage when connected to the input power supply. The input power supply supplies power to a series LED lamp group through the energy storage module. When an enable end of the constant-current driving module receives the enable signal, a first switching end and a second switching end of the constant-current driving module are switched on. The constant-current driving module is used for boosting and driving the LED lamp group to turn on the LD lamp group. When the enable end of the constant-current driving module does not receive the enable signal, the first switching end and the second switching end of the constant-current driving module are switched off. The energy storage module supplies power to the series LED lamp group. When the constant-current driving module receives the enable signal, the series LED lamp group is boosted and driven, and the working power of a load series LED lamp group is increased. Thus, the high-power LED constant-current driving circuit can be connected with a high-power series LED lamp group.
Description
Technical field
The present invention relates to LED drive circuit, particularly relate to a kind of high power LED constant-current driving circuit.
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.Current in the low-voltage place of direct current, the integrated high-frequency model design LED of integration that adopts drives more, but these type of drive are all firm power output, therefore inapplicable for the series LED lamp group that power is larger.
Summary of the invention
Based on this, be necessary to provide a kind of high power LED constant-current driving circuit.
A kind of high power LED constant-current driving circuit, comprises voltage transformation module, for adjusting constant-current driven module and the energy-storage module of output voltage;
The input termination input power of described voltage transformation module, the Enable Pin exporting constant-current driven module described in termination, earth terminal ground connection; The input termination input power of described energy-storage module, output termination series LED lamp group; Described constant-current driven module input termination input power, the first switch terminals and second switch end connect described series LED lamp group, earth terminal ground connection simultaneously;
Input power is converted to enable signal and exports to described constant-current driven module by described voltage transformation module, described energy-storage module starts energy storage when accessing input power, input power is powered to described series LED lamp group by described energy-storage module, after the Enable Pin of described constant-current driven module receives enable signal, first switch terminals of described constant-current driven module and the conducting of second switch end, described constant-current driven module drives series LED lamp group to light for boosting, when the Enable Pin of described constant-current driven module does not receive enable signal, first switch terminals of described constant-current driven module and second switch end are closed, described energy-storage module is powered to described series LED lamp group.
Wherein in an embodiment, described voltage transformation module comprises electric capacity C1, electric capacity C5, voltage-stabiliser tube ZD1 and divider resistance R4, described divider resistance R4 and described voltage-stabiliser tube ZD1 is series between input power and ground connection, 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, the one termination input power of described electric capacity C1, other end ground connection, the points of common connection of described divider resistance R4 and described voltage-stabiliser tube ZD1 is the output of described voltage transformation module.
Wherein in an embodiment, described energy-storage module comprises inductance L 1, and the two ends of described inductance L 1 correspond to input and the output of described energy-storage module.
Wherein in an embodiment, described constant-current driven module comprises chip TPS61500, electric capacity C3, electric capacity C4 and divider resistance R5;
The frequency modulation 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 sampling end of chip TPS61500 described in described electric capacity C3 mono-termination, other end ground connection;
The Enable Pin of described chip TPS61500, input, the first switch terminals and second switch end correspond to the Enable Pin of described boosting driver module, input, the first switch terminals and second switch end.
Wherein in an embodiment, also comprise the sampling module for described series LED lamp group electric current of sampling, the negative pole of series LED lamp group described in described sampling module one termination, other end ground connection, the points of common connection of described sampling module and described series LED lamp group negative pole connects the feedback end of described constant-current driven module.
Wherein in an embodiment, described sampling module comprises sampling resistor R3, the negative pole of series LED lamp group described in described sampling resistor R3 mono-termination, other end ground connection, the points of common connection of described sampling resistor R3 and described series LED lamp group negative pole connects the feedback end of described constant-current driven module.
Wherein in an embodiment; also comprise the overvoltage protective module for the protection of the overvoltage of described series LED lamp group; described overvoltage protective module exports the positive pole of series LED lamp group described in termination, the overvoltage test side of constant-current driven module described in earth terminal ground connection, input termination.
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.
Wherein in an embodiment, also comprise electric capacity C2, the positive pole of series LED lamp group described in described electric capacity C2 mono-termination, other end ground connection.
Above-mentioned high power LED constant-current driving circuit is by energy-storage module energy storage, and input power is powered to series LED lamp group by energy-storage module.Meanwhile, input power is converted to enable signal and exports to constant-current driven module by voltage transformation module.After constant-current driven module receives enable signal, boosting drives series LED lamp group, the operating power of load in series LED group is increased, thus can connect powerful series LED lamp group.
Accompanying drawing explanation
Fig. 1 is the module map of high power LED constant-current driving circuit;
Fig. 2 is the schematic diagram of high power LED constant-current driving circuit.
Embodiment
As shown in Figure 1, be the module map of high power LED constant-current driving circuit.
A kind of high power LED constant-current driving circuit, comprises voltage transformation module 101, for adjusting constant-current driven module 102 and the energy-storage module 103 of output voltage.
The input termination input power of described voltage transformation module 101, the Enable Pin exporting constant-current driven module 102 described in termination, earth terminal ground connection; The input termination input power of described energy-storage module 103, output termination series LED lamp group; Described constant-current driven module 102 inputs termination input power, the first switch terminals and second switch end and connects described series LED lamp group, earth terminal ground connection simultaneously.
Input power is converted to enable signal and exports to described constant-current driven module 102 by described voltage transformation module 101, described energy-storage module 103 starts energy storage when accessing input power, input power is powered to described series LED lamp group by described energy-storage module 103, after the Enable Pin of described constant-current driven module 102 receives enable signal, first switch terminals of described constant-current driven module 102 and the conducting of second switch end, described constant-current driven module 102 boosts and drives series LED lamp group to light, when the Enable Pin of described constant-current driven module 102 does not receive enable signal, first switch terminals of described constant-current driven module 102 and second switch end are closed, described energy-storage module 103 is powered to described series LED lamp group.
During high power LED constant-current driving circuit access power supply, energy-storage module 103 starts charging, and powers to load in series LED group.After energy-storage module 103 is full of electricity, when the first switch terminals and the closedown of second switch end of constant-current driven module 102, namely under the effect of back-emf, continue to power to load in series LED group.
Constant-current driven module 102 for driving lighting of series LED lamp group, and changes the input pressure drop of series LED lamp group.Concrete, constant-current driven module 102 controls output voltage according to the enable signal received, and namely changes the power of series LED lamp group, thus changes the operating power of series LED lamp group.
Voltage transformation module 101 is for providing enable signal for constant-current driven module 102, and when accessing input power, voltage transformation module 101 pairs of constant-current driven module 102 output enable signals, therefore, the output voltage of constant-current driven module 102 raises.And when input power stops exporting, voltage transformation module 101 does not have enable signal to export, then the outputting drive voltage of constant-current driven module 102 is constant, and energy-storage module 103 pairs of series LED lamp groups are powered.
Incorporated by reference to Fig. 2.
Voltage transformation module 101 comprises electric capacity C1, electric capacity C5, voltage-stabiliser tube ZD1 and divider resistance R4, described divider resistance R4 and described voltage-stabiliser tube ZD1 is series between input power and ground connection, 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, the one termination input power of described electric capacity C1, other end ground connection, the points of common connection of described divider resistance R4 and described voltage-stabiliser tube ZD1 is the output of described voltage transformation module 101.
Energy-storage module 103 comprises inductance L 1, and the two ends of described inductance L 1 correspond to input and the output of described energy-storage module 103.
Constant-current driven module 102 comprises chip TPS61500, electric capacity C3, electric capacity C4 and divider resistance R5.
The frequency modulation 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 sampling end of chip TPS61500 described in described electric capacity C3 mono-termination, other end ground connection.
The Enable Pin of described chip TPS61500, input, the first switch terminals and second switch end correspond to the Enable Pin of described constant-current driven module 102, input, the first switch terminals and second switch end.
High power LED constant-current driving circuit also comprises the sampling module 105 for described series LED lamp group electric current of sampling, the negative pole of series LED lamp group described in described sampling module 105 1 termination, other end ground connection, described sampling module 105 and the points of common connection of described series LED lamp group negative pole connect the feedback end of described constant-current driven module 102.
Sampling module 105 comprises sampling resistor R3, the negative pole of series LED lamp group described in described sampling resistor R3 mono-termination, other end ground connection, and the points of common connection of described sampling resistor R3 and described series LED lamp group negative pole connects the feedback end of described constant-current driven module 102.
High power LED constant-current driving circuit also comprises the overvoltage protective module 104 for the protection of the overvoltage of described series LED lamp group; described overvoltage protective module 104 exports the positive pole of series LED lamp group described in termination, the overvoltage test side of constant-current driven module 102 described in earth terminal ground connection, input termination.
Overvoltage protective module 104 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 104.
High power LED constant-current driving 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 103.
High power LED constant-current driving circuit also comprises electric capacity C2, the positive pole of series LED lamp group described in described electric capacity C2 mono-termination, other end ground connection.
Based on above-mentioned all embodiments, the operation principle of high power LED constant-current driving 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 from electric capacity C5 filtering to chip IC M7555 and the enable signal that provide 3V after divider resistance R4 and voltage-stabiliser tube ZD1 dividing potential drop, electric capacity C1 and.After the enable signal of the Enable Pin reception 3V of chip TPS61500.Chip TPS61500 starts to drive series LED lamp group.
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 not before receiving enable signal, 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, voltage transformation module 101 whether output enable signal, just can change the output voltage of chip TPS61500, and then control the power of series LED lamp group, thus reach the effect changing series LED lamp group operating efficiency.
The overvoltage threshold of overvoltage protective module 104 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 high power LED constant-current driving circuit is by energy-storage module 103 energy storage, and input power is powered by energy-storage module 103 pairs of series LED lamp groups.Meanwhile, input power is converted to enable signal and exports to constant-current driven module 102 by voltage transformation module 101.After constant-current driven module 102 receives enable signal, boosting drives series LED lamp group, the operating power of load in series LED group is increased, thus can connect powerful 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. a high power LED constant-current driving circuit, is characterized in that, comprises voltage transformation module, for adjusting constant-current driven module and the energy-storage module of output voltage;
The input termination input power of described voltage transformation module, the Enable Pin exporting constant-current driven module described in termination, earth terminal ground connection; The input termination input power of described energy-storage module, output termination series LED lamp group; Described constant-current driven module input termination input power, the first switch terminals and second switch end connect described series LED lamp group, earth terminal ground connection simultaneously;
Input power is converted to enable signal and exports to described constant-current driven module by described voltage transformation module, described energy-storage module starts energy storage when accessing input power, input power is powered to described series LED lamp group by described energy-storage module, after the Enable Pin of described constant-current driven module receives enable signal, first switch terminals of described constant-current driven module and the conducting of second switch end, described constant-current driven module drives series LED lamp group to light for boosting, when the Enable Pin of described constant-current driven module does not receive enable signal, first switch terminals of described constant-current driven module and second switch end are closed, described energy-storage module is powered to described series LED lamp group.
2. high power LED constant-current driving circuit according to claim 1, it is characterized in that, described voltage transformation module comprises electric capacity C1, electric capacity C5, voltage-stabiliser tube ZD1 and divider resistance R4, described divider resistance R4 and described voltage-stabiliser tube ZD1 is series between input power and ground connection, 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, the one termination input power of described electric capacity C1, other end ground connection, the points of common connection of described divider resistance R4 and described voltage-stabiliser tube ZD1 is the output of described voltage transformation module.
3. high power LED constant-current driving circuit according to claim 1, is characterized in that, described energy-storage module comprises inductance L 1, and the two ends of described inductance L 1 correspond to input and the output of described energy-storage module.
4. high power LED constant-current driving circuit according to claim 1, is characterized in that, described constant-current driven module comprises chip TPS61500, electric capacity C3, electric capacity C4 and divider resistance R5;
The frequency modulation 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 sampling end of chip TPS61500 described in described electric capacity C3 mono-termination, other end ground connection;
The Enable Pin of described chip TPS61500, input, the first switch terminals and second switch end correspond to the Enable Pin of described boosting driver module, input, the first switch terminals and second switch end.
5. high power LED constant-current driving circuit according to claim 1, it is characterized in that, also comprise the sampling module for described series LED lamp group electric current of sampling, the negative pole of series LED lamp group described in described sampling module one termination, other end ground connection, the points of common connection of described sampling module and described series LED lamp group negative pole connects the feedback end of described constant-current driven module.
6. high power LED constant-current driving circuit according to claim 5, it is characterized in that, described sampling module comprises sampling resistor R3, the negative pole of series LED lamp group described in described sampling resistor R3 mono-termination, other end ground connection, the points of common connection of described sampling resistor R3 and described series LED lamp group negative pole connects the feedback end of described constant-current driven module.
7. high power LED constant-current driving circuit according to claim 1; it is characterized in that; also comprise the overvoltage protective module for the protection of the overvoltage of described series LED lamp group; described overvoltage protective module exports the positive pole of series LED lamp group described in termination, the overvoltage test side of constant-current driven module described in earth terminal ground connection, input termination.
8. high power LED constant-current driving circuit according to claim 7; it 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.
9. high power LED constant-current driving 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.
10. high power LED constant-current driving circuit according to claim 1, is characterized in that, also comprises electric capacity C2, the positive pole of series LED lamp group described in described electric capacity C2 mono-termination, other end ground connection.
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| US12464620B2 (en) | 2019-12-19 | 2025-11-04 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for providing power supply to current controllers associated with LED lighting |
| TWI738278B (en) * | 2019-12-19 | 2021-09-01 | 大陸商昂寶電子（上海）有限公司 | LED drive circuit and its operation method and power supply control module |
| US12396079B2 (en) | 2019-12-27 | 2025-08-19 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for controlling currents flowing through light emitting diodes |
| US11723128B2 (en) | 2019-12-27 | 2023-08-08 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for controlling currents flowing through light emitting diodes |
| US11252799B2 (en) | 2019-12-27 | 2022-02-15 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for controlling currents flowing through light emitting diodes |
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