CN214708112U - LED constant current drive circuit capable of improving efficiency - Google Patents
LED constant current drive circuit capable of improving efficiency Download PDFInfo
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- CN214708112U CN214708112U CN202120460437.9U CN202120460437U CN214708112U CN 214708112 U CN214708112 U CN 214708112U CN 202120460437 U CN202120460437 U CN 202120460437U CN 214708112 U CN214708112 U CN 214708112U
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Abstract
The utility model discloses a LED constant current drive circuit of raising efficiency, including 5V power input end, Buck step down circuit and LED constant current drive circuit end, 5V power input end includes bypass electric capacity C553, C549, Buck step down circuit is step down chip TPS62826 machine peripheral circuit, LED constant current drive circuit end includes linear constant current drive chip AW36423 and peripheral circuit. After passing through the Buck voltage reduction circuit, 5V is reduced to 3.3V: the power consumption of the voltage reduction circuit is generally 90%, the efficiency of the whole system which outputs the voltage to the LED after the voltage is reduced to 3.3V is 3/3.3-90.9%, the efficiency of the whole driving circuit is 90-90.9-81.8%, the current consumption of 5V is reduced by adopting constant current after the voltage reduction, the power consumption is reduced, the power consumption of the system is reduced after the efficiency is improved, and the temperature rise of the mainboard is reduced.
Description
Technical Field
The utility model relates to a LED constant current drive circuit technical field, in particular to LED constant current drive circuit who improves efficiency.
Background
With the continuous development of scientific technology, the LED is used as a novel green light source, has the characteristics of energy conservation, environmental protection and high efficiency, is mature in technology and applied to various fields, is widely used as a novel automobile lighting source, and has various LED driving circuits. The LED automobile lamp adopts a connection mode that a plurality of high-power LEDs are connected in series and then connected in parallel, so that the LED driving circuit is required to have the characteristics of wide input voltage and large driving current.
A general LEDLED constant current driving circuit only comprises a 5V power supply input end and a driving chip, and is high in power consumption and low in utilization rate.
Patent No. CN201520013138.5 discloses an LED constant current driving circuit and device using a voltage-reducing constant current driving unit, which provides a far-end power supply or a near-end power supply after voltage-reducing constant current for an LED lighting unit to drive the LED lighting unit, and the far-end and near-end power supplies provided by a direct current power supply are received by the far-end and near-end units to control the LED lighting unit to switch between the far-end and near-end.
The LED constant current driving circuit and the LED constant current driving device adopting the voltage reduction constant current driving unit have the following defects: 1. the power consumption is high; 2. the utilization rate is low. Therefore, the LED constant current driving circuit with improved efficiency is provided.
SUMMERY OF THE UTILITY MODEL
A primary object of the present invention is to provide an efficiency-improved LED constant current driving circuit, which can effectively solve the problems in the background art.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an LED constant current driving circuit capable of improving efficiency comprises a 5V power supply input end, a Buck voltage reduction circuit and an LED constant current driving circuit end, wherein the 5V power supply input end comprises bypass capacitors C553 and C549, the Buck voltage reduction circuit is a voltage reduction chip TPS62826 machine peripheral circuit, and the LED constant current driving circuit end comprises a linear constant current driving chip AW36423 and peripheral circuits thereof.
Furthermore, the output end of the 5V power supply is electrically connected with the input end of the Buck voltage reduction circuit.
Furthermore, the output end of the Buck voltage reduction circuit is electrically connected with the input end of the LED constant current driving circuit.
Furthermore, the AW36423 is a linear constant current driving chip, and the AW36423 is used for driving the chipWorking efficiency is Vf/VinSaid V isfIs the forward voltage of the LED constant current drive circuit end, the voltage V isinIs the input voltage.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. an Input-5V power supply Input is provided from the outside, and then a Buck voltage reduction circuit is used for converting the 5V Input power supply into 3.3V stable voltage suitable for driving an LED; the LED constant current driving chip AW36423 starts to work after obtaining 3.3V stable voltage and drives the double-path LED lamp, the AW36423 is a linear constant current driving chip, and the working efficiency is Vf/Vin(if the lamp is powered by 5V, if Vf is 3V, the efficiency is 3/5 ═ 60%), after passing through the Buck circuit, 5V is reduced to 3.3V: the power consumption of the voltage reduction circuit is generally 90%, and the efficiency of the whole system for outputting the voltage reduced to 3.3V to the LED is 3/3.3-90.9%, so that the efficiency of the whole driving circuit is 90% × 90.9% -81.8%.
2. By adopting the constant current after voltage reduction, the current consumption of 5V is reduced, the power consumption is reduced, after the efficiency is improved, the power consumption of the system is reduced, and the temperature rise of the mainboard is reduced.
Drawings
Fig. 1 is the utility model relates to a LED drive circuit architecture diagram of LED constant current drive circuit of raising efficiency.
Fig. 2 is the utility model relates to a LED constant current drive circuit's Buck step down circuit diagram of raising efficiency.
Fig. 3 is the utility model relates to a LED constant current drive circuit diagram of LED constant current drive circuit of raising efficiency.
Fig. 4 is the utility model relates to a LED constant current drive circuit's of raising efficiency 3V output schematic diagram.
In the figure: 1. a 5V power supply input terminal; 2. a Buck voltage reduction circuit; 3. and an LED constant current driving circuit end.
Detailed Description
In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention is further described below with reference to the following embodiments.
As shown in fig. 1-4, an LED constant current driving circuit for improving efficiency includes a 5V power input end 1, a Buck voltage reducing circuit 2 and an LED constant current driving circuit end 3, where the 5V power input end 1 includes bypass capacitors C553 and C549, the Buck voltage reducing circuit 2 is a voltage reducing chip TPS62826 peripheral circuit, and the LED constant current driving circuit end 3 includes a linear constant current driving chip AW36423 and peripheral circuits thereof.
And the output end of the 5V power supply 1 is electrically connected with the input end of the Buck voltage reduction circuit 2.
The output end of the Buck voltage reduction circuit 2 is electrically connected with the input end of the LED constant current drive circuit end 3.
Wherein the AW36423 is a linear constant current driving chip, and the working efficiency of the AW36423 is Vf/VinSaid V isfIs the forward voltage of the LED constant current drive circuit end 3, VinIs the input voltage.
It should be noted that the utility model relates to a LED constant current drive circuit for improving efficiency, when in use, the utility model provides Input-5V power Input from outside, and then converts the 5V Input power into 3.3V stable voltage suitable for LED driving through the Buck voltage reduction circuit 2; the LED constant current driving chip AW36423 starts to work after obtaining 3.3V stable voltage and drives the double-path LED lamp, the AW36423 is a linear constant current driving chip, and the working efficiency is Vf/Vin(if the lamp is powered by 5V, if Vf is 3V, the efficiency is 3/5 ═ 60%), after passing through Buck circuit 2, 5V is reduced to 3.3V: the power consumption of the voltage reduction circuit is generally 90%, the efficiency of the whole system which outputs the voltage to the LED after the voltage is reduced to 3.3V is 3/3.3-90.9%, the efficiency of the whole driving circuit is 90-90.9-81.8%, the current consumption of 5V is reduced by adopting constant current after the voltage reduction, the power consumption is reduced, the power consumption of the system is reduced after the efficiency is improved, and the temperature rise of the mainboard is reduced.
The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. The LED constant-current driving circuit capable of improving the efficiency comprises a 5V power supply input end (1), a Buck voltage reduction circuit (2) and an LED constant-current driving circuit end (3), and is characterized in that the 5V power supply input end (1) comprises bypass capacitors C553 and C549, the Buck voltage reduction circuit (2) is a voltage reduction chip TPS62826 machine peripheral circuit, and the LED constant-current driving circuit end (3) comprises a linear constant-current driving chip AW36423 and peripheral circuits thereof.
2. The LED constant current driving circuit with improved efficiency according to claim 1, wherein: the output end of the 5V power supply (1) is electrically connected with the input end of the Buck voltage reduction circuit (2).
3. The LED constant current driving circuit with improved efficiency according to claim 1, wherein: the output end of the Buck voltage reduction circuit (2) is electrically connected with the input end of the LED constant current driving circuit end (3).
4. The LED constant current driving circuit with improved efficiency according to claim 1, wherein: the AW36423 is a linear constant current driving chip, and the working efficiency of the AW36423 is Vf/VinSaid V isfIs the forward voltage of an LED constant current drive circuit end (3), VinIs the input voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120460437.9U CN214708112U (en) | 2021-03-03 | 2021-03-03 | LED constant current drive circuit capable of improving efficiency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120460437.9U CN214708112U (en) | 2021-03-03 | 2021-03-03 | LED constant current drive circuit capable of improving efficiency |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214708112U true CN214708112U (en) | 2021-11-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120460437.9U Active CN214708112U (en) | 2021-03-03 | 2021-03-03 | LED constant current drive circuit capable of improving efficiency |
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| CN (1) | CN214708112U (en) |
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2021
- 2021-03-03 CN CN202120460437.9U patent/CN214708112U/en active Active
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