CN103139968A - Light-emitting diode (LED) driving circuit and LED lamp - Google Patents
Light-emitting diode (LED) driving circuit and LED lamp Download PDFInfo
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- CN103139968A CN103139968A CN2011103905238A CN201110390523A CN103139968A CN 103139968 A CN103139968 A CN 103139968A CN 2011103905238 A CN2011103905238 A CN 2011103905238A CN 201110390523 A CN201110390523 A CN 201110390523A CN 103139968 A CN103139968 A CN 103139968A
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Abstract
A light-emitting diode (LED) driving circuit comprises a voltage adjusting module, a constant current module and LED light sources, wherein the output end of the voltage adjusting module can provide adjustable voltage signals from the constant current module, and the constant current module can provide different kinds of constant current for the first LED light source and/or the second LED light source according to the different voltage signals provided by the voltage adjusting module. The invention further provides an LED lamp which is connected with a direct current power supply. The LED lamp comprises LED light sources and the LED driving circuit for driving the LED light sources. The LED driving circuit uses the voltage adjusting module and the constant current module to achieve that when operational voltage of the LED light sources is lower than rated operational voltage, the voltage adjusting module can be adjusted to provide different voltage signals for the constant current module. The constant current can chose full load to drive the first LED light source and/or the second LED light source to achieve the purpose of independently driving the LED light sources.
Description
[technical field]
The present invention relates to the drive circuit field, particularly relate to a kind of LED drive circuit.
[background technology]
Along with the development of science and technology, new product is constantly updated, and LED is as new type light source, and it has energy-saving and environmental protection, efficient characteristics.The LED technology is ripe and be applied to every field, LED is widely used as light source, various LED drive circuits also occurred, but LED is as the current mode load thereupon, the electric current that flows through LED must guarantee in specified electric current, otherwise can accelerate LED light decay, aging even damage.Because LED self is harsher to the operating voltage requirement, overtension is too low all can cause LED operating current fluctuation, so will adopt the type of drive of constant current to LED.In the low pressure place of lithium battery power supply, people like adopting the step-down constant current technology to come driving LED at present, and it has the advantages such as power consumption is little, efficient is high, lightweight.But the voltage of lithium battery can progressively reduce along with discharge time, when the voltage of lithium battery during lower than the LED rated operational voltage, can cause the LED operating current to reduce, output light flux also reduces so, and LED can not operate at full capacity, and has brought serious inconvenience to the user.
[summary of the invention]
Based on this, when being necessary to provide a kind of operating voltage lower than rated operational voltage, but the LED drive circuit that two groups of LED light sources of drive are operated at full capacity.
A kind of LED drive circuit is used for driving the first LED light source and the second LED light source, comprises Voltage Regulator Module and constant flow module;
The output of described Voltage Regulator Module provides adjustable voltage signal for described constant flow module;
The different voltage signal that described constant flow module provides according to Voltage Regulator Module provides different constant currents for described the first LED light source and/or the second LED light source.
Preferably, the corresponding described voltage signal of described constant current is linear.
Preferably, Voltage Regulator Module comprises voltage stabilizing didoe D1, potentiometer R1 and the first divider resistance R2, described the first divider resistance R2 and described potentiometer R1 series connection, the other end of described potentiometer R1 connects respectively the anodal and ground of described voltage stabilizing didoe D1, the other end of described the first divider resistance R2 connects respectively negative pole and the DC power supply of described voltage stabilizing didoe D1, draw an output between described the first divider resistance R2 and described potentiometer R1, for described constant flow module provides adjustable voltage signal.
Preferably, also be connected in series the second divider resistance R3 between described DC power supply and the first divider resistance R2.
preferably, described constant flow module comprises constant current chip U1, switch S 1, S2, inductance L 1, resistance R 4, capacitor C 1, C2, C3, storage capacitor C4, described the first LED light source and the second LED light source are connected in series, the negative pole of described the first LED light source connects the positive pole of described the second LED light source, the compensation pin of described constant current chip is by described capacitor C 2 ground connection, the first output voltage of described constant current chip detects pin and connects respectively the positive pole of the first LED light source and an end of described capacitor C 3, the other end of described capacitor C 3 connects respectively power supply ground pin and the ground of described constant current chip U1, feedback pin connects the negative pole of the second LED light source, the negative pole of the second LED light source is by described resistance R 4 ground connection, the control pin of described constant current chip U1 connects the output of described Voltage Regulator Module 100, DC power supply connects respectively the power pins of described constant current chip U1 after by described capacitor C 1 filtering, described inductance L 1 and described switch S 1, S2, the other end of described switch S 1 connects the first enable pin of described constant current chip U1, the other end of described switch S 2 connects the second enable pin of described constant current chip U1, the other end of described inductance L 1 connects respectively the output pin of described constant current chip U1 and the positive pole of described the first LED light source, the positive pole of described the first LED light source also connects the positive pole of described storage capacitor C4, the minus earth of described storage capacitor C4, the first enable pin can make the first output voltage of described constant current chip U1 detect the internal short-circuit of pin and the second output voltage detection pin, the second enable pin can make the second output voltage detect the internal short-circuit of pin and feedback pin, after the Voltage Regulator Module output provides voltage signal for the control pin of described constant current chip U1, the inside component voltage of the control pin of the sampled voltage of described feedback pin and described constant current chip U1 relatively, described constant current chip is adjusted at the output pin output constant current of described constant current chip U1 automatically, described the first output voltage detects pin and the second output voltage detects the voltage that pin detects respectively corresponding pin, when the voltage that detects is protected voltage greater than described constant current chip U1, described constant current chip U1 internal protection circuitry work, described constant current chip U1 quits work.
preferably, described constant current chip is the EUP2582 chip, described the first LED light source and the second LED light source are connected in series, the negative pole of described the first LED light source connects the positive pole of described the second LED light source, the GND pin ground connection of EUP2582 chip, the COMP pin is by described capacitor C 2 ground connection, the OUT1 pin connects respectively the positive pole of described the first LED light source and an end of described capacitor C 3, the other end of described capacitor C 3 connects respectively PGND pin and ground, the CS pin connects the negative pole of described the second LED light source, the negative pole of described the second LED light source is by described resistance R 4 ground connection, the CTRL pin connects the output of described Voltage Regulator Module, DC power supply connects respectively the VCC pin of EUP2582 chip after by described capacitor C 1 filtering, the VPP pin, described inductance L 1 and described switch S 1, S2, the other end of described switch S 1 connects the EN1 pin, the other end of described switch S 2 connects the EN2 pin, the other end of described inductance L 1 connects respectively the positive pole of LX pin and described the first LED light source, the positive pole of described the first LED light source also connects the positive pole of described storage capacitor C4, the minus earth of described storage capacitor C4.
Preferably, also be connected in series resistance R 5 between the node of described DC power supply and described switch S 1, S2, the EN1 pin is by pull-up resistor R6 ground connection, the EN2 pin is by pull-up resistor R7 ground connection, also be connected in series diode D2 between described LX pin and the first LED light source positive pole, the positive pole of described diode D2 connects the LX pin of EUP2582 chip, and the negative pole of described diode D2 connects the positive pole of the first LED light source.
Preferably, described constant flow module also comprises capacitor C 5 and resistance R 8, also is connected in series resistance R 8 between the CS pin of EUP2582 chip and the second LED light source negative pole, and the CS pin of EUP2582 chip is by capacitor C 5 ground connection.
Preferably, described LED drive circuit also comprises capacitor C 6 and capacitor C 7, and described capacitor C 6 is connected in parallel with described the first LED light source, and described capacitor C 7 is connected in parallel with described the second LED light source.
In addition, the present invention also provides a kind of LED light fixture, be connected with DC power supply, and the above-mentioned LED drive circuit that it comprises LED light source and is used for driving described LED light source.
Above-mentioned LED drive circuit is by Voltage Regulator Module and constant flow module, realize that LED light source is in operating voltage during lower than rated operational voltage, by the regulation voltage adjustment module, for constant flow module provides different voltage signals, constant flow module can be selected driven at full load the first LED light source and/or the second LED light source, reaches the purpose of drive LED light source.
[description of drawings]
Fig. 1 is the block diagram of present embodiment;
Fig. 2 is the circuit diagram of present embodiment.
[embodiment]
As shown in Figure 1 and Figure 2, a kind of LED drive circuit that present embodiment provides is used for driving the first LED light source 300 and the second LED light source 400, comprises Voltage Regulator Module 100 and constant flow module 200; The output of Voltage Regulator Module 100 provides adjustable voltage signal for constant flow module 200, and the varying voltage signal that constant flow module 200 provides according to Voltage Regulator Module 100 provides different constant currents for the first LED light source 300 and/or the second LED light source 400.In present embodiment, the corresponding described voltage signal of constant electric current is linear.
The second divider resistance R3 divides a part voltage that DC power supply provides, and makes the voltage that is carried in the first divider resistance R2 and potentiometer R1 can be not bigger than normal.The first divider resistance R2 further divides a part DC power supply that loads, and makes potentiometer R1 have a suitable range of regulation.When the voltage that is carried in the first divider resistance R2 and potentiometer R1 when DC power supply surpasses the voltage stabilizing value of voltage stabilizing didoe D1, voltage stabilizing didoe D1 conducting can not increase along with the rising of DC power supply voltage the voltage that is carried in the first divider resistance R2 and potentiometer R1.Certainly, in other embodiments, the first divider resistance R2, the second divider resistance R3 and voltage stabilizing didoe D1 can omit, and potentiometer R1 one end connects DC power supply and as the output of Voltage Regulator Module 100, the other end ground connection of potentiometer R1.Be appreciated that Voltage Regulator Module 100 can be also other execution modes, from no-voltage, externally exports the adjustable voltage signal.
In present embodiment, constant current chip U1 adopts the EUP2582 chip.the first LED light source 300 and the second LED light source 400 are connected in series, the negative pole of the first LED light source 300 connects the positive pole of the second LED light source 400, the GND pin ground connection of EUP2582 chip, the COMP pin is by capacitor C 2 ground connection, the OUT1 pin connects respectively the positive pole of the first LED light source 300 and an end of capacitor C 3, the other end of capacitor C 3 connects respectively PGND pin and ground, the CS pin connects the negative pole of the second LED light source 400 by resistance R 8, the CS pin is also by capacitor C 5 ground connection, the negative pole of the second LED light source 400 is by resistance R 4 ground connection, the CTRL pin connects the output of Voltage Regulator Module 100, DC power supply connects respectively the VCC pin of EUP2582 chip after by capacitor C 1 filtering, the VPP pin, inductance L 1 and resistance R 5, the other end of resistance R 5 is connecting valve S1 respectively, S2, the other end of switch S 1 connects the EN1 pin, the EN1 pin is by resistance R 6 ground connection, the other end of switch S 2 connects the EN2 pin, EN2 is by resistance R 7 ground connection, the other end of inductance L 1 connects respectively the positive pole of LX pin and diode D2, the negative pole of diode D2 connects the positive pole of the first LED light source 300, the positive pole of the first LED light source 300 also connects the positive pole of storage capacitor C4, the minus earth of storage capacitor C4.
Below sketch the operation principle of constant flow module 200, the principle fundamental sum EUP2561 chip of EUP2582 chip is identical, can provide different constant currents for the outside according to the varying voltage signal that Voltage Regulator Module 100 provides.The operation principle of EUP2561 chip is exactly automatically to adjust the duty ratio of inner N-channel MOS pipe according to the pressure drop above sampling resistor R4.Inner N-channel MOS pipe switching frequency is very high, in one-period, when inner N-channel MOS pipe open-minded, DC power supply voltage forms path through energy storage inductor L1, inner N-channel MOS pipe and GND, to energy storage inductor L1 storage power, this moment, storage capacitor C4, LED lamp group, sampling resistor R4 formed the work loop, and the operating current of LED lamp group relies on storage capacitor C4 to keep; When inner N-channel MOS pipe is closed, DC power supply voltage forms the work loop through energy storage inductor L1, LED lamp group, sampling resistor R4, energy in energy storage inductor L1 and DC power supply energy superpose, thereby the function that realization is boosted, the operating current of LED lamp group rely on power supply and energy storage inductor L1 jointly to keep; Until the inner N-channel MOS pipe of next cycle is open-minded, thus the purpose that reaches stabling current and boost, and namely as long as the voltage signal that sampling resistor R4 and Voltage Regulator Module provide is definite, output current is namely determined so.the CTRL of CS feedback pin and EUP2561 controls pin and forms a comparator, feedback pin CS according to sampled voltage and the inside component voltage of controlling pin CTRL pin relatively after, it is open-minded that inner N-channel MOS pipe is controlled in the inner adjustment automatically of chip EUP2561, close the duty ratio of pulse, if sampled voltage is greater than inner component voltage, illustrate that output current is greater than set point, the duty ratio of so inner N-channel MOS pipe conducting just raises, reduce output current to set point, if sampled voltage is less than inner component voltage, illustrate that output current is less than set point, the duty ratio of so inner N-channel MOS pipe conducting just reduces, increase output current to set point.Difference is, EUP2582 can be by the internal short-circuit that makes OUT1 pin and OUT2 pin, OUT2 pin and CS pin of enable pin EN1 and EN2 selection, thereby selectable to the first LED light source 300 and/or the second LED light source 400 raising constant currents, drive the first LED light source 300 and/or the second LED light source 400 and operate at full capacity.Be appreciated that constant current chip U1 can also be other constant current chips with external output constant current of above-mentioned functions.
In present embodiment, resistance R 5 is current-limiting resistances, and resistance R 6, R7 are pull-up resistor, and uncertain signal is limited in high level by a resistance R 6 or R7, and resistance plays metering function simultaneously.Diode D2 plays rectified action, capacitor C 5 filtering, resistance R 8 current limlitings, protection CS pin.In other embodiments, diode D2, resistance R 5, R6, R7, R8 can omit.
In present embodiment, Voltage Regulator Module 100 and constant flow module 200 share a DC power supply, be that Voltage Regulator Module 100 also is connected to DC power supply on the filtered output of capacitor C 1, be connected in series a switch S 3 between DC power supply and capacitor C 1, control the closed of whole LED drive circuit or turn-off.
The first LED light source 300 and the second LED light source 400 are in series for a plurality of light-emitting diodes, a plurality of light-emitting diode is formed in parallel or the array of a plurality of light-emitting diode connection in series-parallel combinations.Capacitor C 6 in parallel between the both positive and negative polarity of the first LED light source 300, the capacitor C 7 that is connected in parallel between the both positive and negative polarity of the second LED light source 400, the ripple in the constant electric current that filtering constant flow module 200 provides.In other embodiments, capacitor C 6, C7 can omit.
Above-mentioned LED drive circuit is by Voltage Regulator Module 100 and constant flow module 200, realize that LED light source is in operating voltage during lower than rated operational voltage, by regulation voltage adjustment module 100, for constant flow module 200 provides different voltage signals, constant flow module 200 can be selected driven at full load the first LED light source 300 and/or the second LED light source 400, reaches the purpose of drive LED light source.
In addition, the present invention also provides a kind of LED light fixture, be connected with DC power supply, and the above-mentioned LED drive circuit that it comprises LED light source and is used for the driving LED light source.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.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 LED drive circuit, be used for driving the first LED light source and the second LED light source, it is characterized in that, comprises Voltage Regulator Module and constant flow module;
The output of described Voltage Regulator Module provides adjustable voltage signal for described constant flow module;
The different voltage signal that described constant flow module provides according to Voltage Regulator Module provides different constant currents for described the first LED light source and/or the second LED light source.
2. LED drive circuit according to claim 1, is characterized in that, the corresponding described voltage signal of described constant current is linear.
3. LED drive circuit according to claim 1, it is characterized in that, Voltage Regulator Module comprises voltage stabilizing didoe D1, potentiometer R1 and the first divider resistance R2, described the first divider resistance R2 and described potentiometer R1 series connection, the other end of described potentiometer R1 connects respectively the anodal and ground of described voltage stabilizing didoe D1, the other end of described the first divider resistance R2 connects respectively D1 negative pole and the direct current of described voltage stabilizing didoe, draw an output between described the first divider resistance R2 and described potentiometer R1, for described constant flow module provides adjustable voltage signal.
4. LED drive circuit according to claim 3, is characterized in that, also is connected in series the second divider resistance R3 between described DC power supply and the first divider resistance R2.
5. LED drive circuit according to claim 1, it is characterized in that, described constant flow module comprises constant current chip U1, switch S 1, S2, inductance L 1, resistance R 4, capacitor C 1, C2, C3, storage capacitor C4, described the first LED light source and the second LED light source are connected in series, the negative pole of described the first LED light source connects the positive pole of described the second LED light source, the compensation pin of described constant current chip is by described capacitor C 2 ground connection, the first output voltage of described constant current chip detects pin and connects respectively the positive pole of described the first LED light source and an end of described capacitor C 3, the other end of described capacitor C 3 connects respectively power supply ground pin and the ground of described constant current chip U1, feedback pin connects the negative pole of the second LED light source, the negative pole of the second LED light source is by described resistance R 4 ground connection, the control pin of described constant current chip U1 connects the output of described Voltage Regulator Module, DC power supply connects respectively the power pins of described constant current chip U1 after by described capacitor C 1 filtering, described inductance L 1 and described switch S 1, S2, the other end of described switch S 1 connects the first enable pin of described constant current chip U1, the other end of described switch S 2 connects the second enable pin of described constant current chip U1, the other end of described inductance L 1 connects respectively the output pin of described constant current chip U1 and the positive pole of described the first LED light source, the positive pole of described the first LED light source also connects the positive pole of described storage capacitor C4, the minus earth of described storage capacitor C4, the first enable pin can make the first output voltage of described constant current chip U1 detect the internal short-circuit of pin and the second output voltage detection pin, the second enable pin can make the second output voltage detect the internal short-circuit of pin and feedback pin, after the Voltage Regulator Module output provides voltage signal for the control pin of described constant current chip U1, the inside component voltage of the control pin of the sampled voltage of described feedback pin and described constant current chip U1 relatively, described constant current chip is adjusted at the output pin output constant current of described constant current chip U1 automatically, described the first output voltage detects pin and the second output voltage detects the voltage that pin detects respectively corresponding pin, when the voltage that detects is protected voltage greater than described constant current chip U1, described constant current chip U1 internal protection circuitry work, described constant current chip U1 quits work.
6. LED drive circuit according to claim 5, it is characterized in that, described constant current chip is the EUP2582 chip, described the first LED light source and the second LED light source are connected in series, the negative pole of described the first LED light source connects the positive pole of described the second LED light source, the GND pin ground connection of EUP2582 chip, the COMP pin is by described capacitor C 2 ground connection, the OUT1 pin connects respectively the positive pole of described the first LED light source and an end of described capacitor C 3, the other end of described capacitor C 3 connects respectively PGND pin and ground, the CS pin connects the negative pole of described the second LED light source, the negative pole of described the second LED light source is by described resistance R 4 ground connection, the CTRL pin connects the output of described Voltage Regulator Module, DC power supply connects respectively the VCC pin of EUP2582 chip after by described capacitor C 1 filtering, the VPP pin, described inductance L 1 and described switch S 1, S2, the other end of described switch S 1 connects the EN1 pin, the other end of described switch S 2 connects the EN2 pin, the other end of described inductance L 1 connects respectively the positive pole of LX pin and described the first LED light source, the positive pole of described the first LED light source also connects the positive pole of described storage capacitor C4, the minus earth of described storage capacitor C4.
7. LED drive circuit according to claim 6, it is characterized in that, also be connected in series resistance R 5 between the node of described DC power supply and described switch S 1, S2, the EN1 pin is by pull-up resistor R6 ground connection, the EN2 pin is by pull-up resistor R7 ground connection, also be connected in series diode D2 between described LX pin and described the first LED light source positive pole, the positive pole of described diode D2 connects the LX pin of EUP2582 chip, and the negative pole of described diode connects the positive pole of described the first LED light source.
8. LED drive circuit according to claim 6, it is characterized in that, described constant flow module also comprises capacitor C 5 and resistance R 8, also is connected in series resistance R 8 between the CS pin of EUP2582 chip and described the second LED light source negative pole, and the CS pin of EUP2582 chip is by capacitor C 5 ground connection.
9. LED drive circuit according to claim 1, is characterized in that, described LED drive circuit also comprises capacitor C 6 and capacitor C 7, and described capacitor C 6 is connected in parallel with described the first LED light source, and described capacitor C 7 is connected in parallel with described the second LED light source.
10. a LED light fixture, be connected with DC power supply, it is characterized in that, comprises that LED light source reaches the LED drive circuit as claimed in any one of claims 1-9 wherein that is used for driving described LED light source work.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011103905238A CN103139968A (en) | 2011-11-30 | 2011-11-30 | Light-emitting diode (LED) driving circuit and LED lamp |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011103905238A CN103139968A (en) | 2011-11-30 | 2011-11-30 | Light-emitting diode (LED) driving circuit and LED lamp |
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| CN103139968A true CN103139968A (en) | 2013-06-05 |
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| CN2011103905238A Pending CN103139968A (en) | 2011-11-30 | 2011-11-30 | Light-emitting diode (LED) driving circuit and LED lamp |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104701809A (en) * | 2015-03-30 | 2015-06-10 | 珠海绿金能控科技有限公司 | LED constant-voltage power supply with self-locking protecting circuit |
| CN104768264A (en) * | 2014-01-02 | 2015-07-08 | 深圳市海洋王照明工程有限公司 | High-power dimming LED constant-current driving circuit |
| CN104768266A (en) * | 2014-01-02 | 2015-07-08 | 深圳市海洋王照明工程有限公司 | Low-power LED constant-current low-power-consumption driving circuit |
| CN104952397A (en) * | 2014-03-25 | 2015-09-30 | 深圳市海洋王照明工程有限公司 | LED backlight drive circuit and LCD display |
| CN108012365A (en) * | 2016-10-28 | 2018-05-08 | 松下知识产权经营株式会社 | Lighting circuit and lighting device |
| CN108735724A (en) * | 2017-04-18 | 2018-11-02 | 深圳市德润达光电股份有限公司 | A kind of miniature integration module of LED linear driving power |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104768264A (en) * | 2014-01-02 | 2015-07-08 | 深圳市海洋王照明工程有限公司 | High-power dimming LED constant-current driving circuit |
| CN104768266A (en) * | 2014-01-02 | 2015-07-08 | 深圳市海洋王照明工程有限公司 | Low-power LED constant-current low-power-consumption driving circuit |
| CN104768264B (en) * | 2014-01-02 | 2019-03-22 | 深圳市海洋王照明工程有限公司 | High-power Dimmable LED constant-current drive circuit |
| CN104768266B (en) * | 2014-01-02 | 2019-07-23 | 深圳市海洋王照明工程有限公司 | Low-power LED constant current low-power-consumption driving circuit |
| CN104952397A (en) * | 2014-03-25 | 2015-09-30 | 深圳市海洋王照明工程有限公司 | LED backlight drive circuit and LCD display |
| CN104952397B (en) * | 2014-03-25 | 2019-02-05 | 深圳市海洋王照明工程有限公司 | A kind of LED backlight drive circuit and LCD display |
| CN104701809A (en) * | 2015-03-30 | 2015-06-10 | 珠海绿金能控科技有限公司 | LED constant-voltage power supply with self-locking protecting circuit |
| CN104701809B (en) * | 2015-03-30 | 2019-03-01 | 珠海绿金能控科技有限公司 | A kind of LED constant voltage source with self-locking protective circuit |
| CN108012365A (en) * | 2016-10-28 | 2018-05-08 | 松下知识产权经营株式会社 | Lighting circuit and lighting device |
| CN108012365B (en) * | 2016-10-28 | 2021-09-28 | 松下知识产权经营株式会社 | Lighting circuit and lighting device |
| CN108735724A (en) * | 2017-04-18 | 2018-11-02 | 深圳市德润达光电股份有限公司 | A kind of miniature integration module of LED linear driving power |
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Application publication date: 20130605 |