CN113316289A - LED power supply circuit - Google Patents
LED power supply circuit Download PDFInfo
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- CN113316289A CN113316289A CN202010118591.8A CN202010118591A CN113316289A CN 113316289 A CN113316289 A CN 113316289A CN 202010118591 A CN202010118591 A CN 202010118591A CN 113316289 A CN113316289 A CN 113316289A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 35
- 238000005086 pumping Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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Abstract
The invention discloses an LED power supply circuit, which comprises: an LED light bar; the LED driving control chip is electrically connected with the LED lamp bar and used for adjusting the brightness of the LED lamp bar; the alternating current-direct current conversion circuit module comprises a conversion circuit, and the conversion circuit is electrically connected with the LED lamp strip and is used for converting commercial alternating current into direct current to be used as input voltage of the LED lamp strip; the ac-dc conversion circuit module further includes a TL431 circuit, the LED driving control chip is electrically connected to the TL431 circuit, and the LED driving control chip outputs a first voltage to the TL431 circuit for adjusting the magnitude of the input voltage of the LED light bar. The LED power circuit can realize the brightness adjustment of the LED only through the AC-DC conversion circuit and the LED driving chip. A plurality of groups of direct current-direct current conversion circuits are omitted, the increase of the internal circuit space occupied by the LED brightness adjusting circuit is reduced, and the cost is reduced.
Description
Technical Field
The invention relates to an LED power circuit, in particular to an LED power circuit capable of adjusting LED brightness.
Background
Although the size of the current display device tends to be larger, the display device has more functions, and the space of the internal circuit is smaller. There are limitations to allowing many customers to customize their designs or to add functionality. If we can reduce the space of the LED power circuit, the inner space can be better utilized.
The current LED power supply circuit mainly realizes the brightness adjustment of an LED through three large frameworks: the LED driving circuit comprises an alternating current-direct current conversion circuit, a direct current-direct current conversion circuit and an LED driving chip. The current driving principle of LED brightness adjustment is to connect an LED driving chip to a dc-dc conversion circuit, wherein the LED driving chip adjusts the LED driving voltage through a feedback terminal. Therefore, there are many sets of dc-dc conversion circuits in the internal circuit space to process the operation separately, so that the internal circuit space occupied by the LED light source circuit is increased and the cost is increased.
Disclosure of Invention
In view of the problems in the prior art, the present invention provides an LED power circuit to solve the above problems.
Therefore, an object of the present invention is to provide an LED power circuit, which includes:
an LED light bar;
the LED driving control chip is electrically connected with the LED lamp bar and used for adjusting the brightness of the LED lamp bar;
the alternating current-direct current conversion circuit module comprises a conversion circuit, the conversion circuit is electrically connected with the LED lamp strip, and the conversion circuit is used for converting commercial alternating current into direct current to be used as input voltage of the LED lamp strip;
the ac-dc conversion circuit module further includes a TL431 circuit, the LED driving control chip is electrically connected to the TL431 circuit, and the LED driving control chip outputs a first voltage to the TL431 circuit for adjusting the magnitude of the input voltage of the LED light bar.
As an optional technical solution, the LED driving control chip includes a voltage feedback terminal, and the voltage feedback terminal is electrically connected to the TL431 circuit.
As an optional technical solution, the ac-dc conversion circuit module further includes a first resistor and a second resistor, a first end of the first resistor is connected to the output end of the ac-dc conversion circuit module, and a second end of the first resistor is connected to the TL431 circuit; the first terminal of the second resistor is connected to the TL431 circuit, and the second terminal of the second resistor is connected to ground.
As an optional technical solution, the first resistor, the second resistor and the TL431 circuit are electrically connected to a connection point, and the LED driving control chip is electrically connected to the connection point.
As an optional technical solution, the LED driving control chip obtains the first current from the connection point.
As an optional technical solution, the LED driving control chip obtains the first current from the connection point by adopting a load-pumping manner.
As an optional technical solution, when the LED driving control chip controls the first voltage to increase, the first current increases.
As an optional technical solution, when the first current is increased, the current flowing through the first resistor is increased, so that the voltage of the first resistor is increased, and the input voltage is further increased.
Optionally, the connection point has a second potential.
As an optional technical solution, the second potential is a fixed potential.
Compared with the prior art, the LED power circuit can realize the brightness adjustment of the LED only through the AC-DC conversion circuit module and the LED driving chip. The driving voltage of the LED lamp strip can be adjusted by directly arranging the LED driving chip in the TL431 circuit in the AC-DC conversion circuit module, so that a plurality of groups of DC-DC conversion circuits are omitted. The LED power supply circuit design reduces the increase of the internal circuit space occupied by the LED brightness adjusting circuit and reduces the cost.
The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.
Drawings
Fig. 1 is a schematic diagram of the LED power supply circuit principle of the present invention.
Detailed Description
In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.
Referring to fig. 1, fig. 1 is a schematic diagram of an LED power circuit of the present invention, the LED power circuit of the present invention includes: the LED driving circuit comprises an AC-DC conversion circuit module 100, an LED driving control chip 200 and an LED light bar 300. The light bar 300 is electrically connected to the ac-dc conversion circuit module 100 and the LED driving control chip 200, respectively, and the driving voltage of the light bar 300 is adjusted by the ac-dc conversion circuit module 100 and the LED driving control chip 200.
Referring to fig. 1, the ac-dc converter circuit module 100 includes a converter circuit 110, a TL431 circuit 120, a first resistor R1, and a second resistor R2. The switching circuit 110 is an ac-dc signal switching circuit for converting commercial ac power into dc power as the input voltage of the LED light bar 300. The TL431 circuit 120 is a voltage stabilizing circuit inside the ac-dc converting circuit module 100.
In an embodiment of the invention, the LED driving control chip 200 includes a voltage feedback terminal electrically connected to the TL431 circuit 120. The LED driving control chip 200 outputs a first voltage V1 to the TL431 circuit 120 for controlling the voltage level output by the ac-dc conversion circuit module 100, i.e. for adjusting the input voltage level of the LED light bar 300.
In an embodiment, the ac-dc conversion circuit module 100 further includes a first resistor R1 and a second resistor R2, a first end of the first resistor R1 is connected to the output end of the ac-dc conversion circuit module 100, and a second end of the first resistor R1 is connected to the TL431 circuit 120; a first terminal of a second resistor R2 is connected to the TL431 circuit 120, and a second terminal of a second resistor R2 is connected to ground.
The first resistor R1, the second resistor R2 and the TL431 circuit 120 are electrically connected to a connection point a, and the connection point a is electrically connected to the LED driving control chip 200. Since the connection point a is electrically connected to the TL431 circuit 120, that is, the connection point a is electrically connected to the voltage regulator circuit, the potential at the connection point a is a fixed potential, and the potential is defined as the second potential V2, in practical applications, the voltage value of the second potential V2 may be 24V, and the resistance values of the first resistor R1 and the second resistor R2 may be set according to practical requirements.
When the LED light bar 300 does not need to adjust the brightness, according to the circuit structure of the present invention, the magnitude of the input voltage of the LED light bar 300 is related to the first resistor R1 and the second resistor R2, and the input voltage of the LED light bar 300 is specifically Vout ═ V2 (1+ R1/R2), and at this time, the input voltage of the LED light bar 300 is a fixed voltage.
When the LED light bar 300 requires brightness adjustment, the LED driving control chip 200 controls the first voltage V1 input to the TL431 circuit 120 to increase. When the first voltage V1 increases, the current at the connection point a increases because the connection point a is at a fixed potential.
At this time, the LED driving control chip 200 obtains the first current I1 from the connection point a. As the first current I1 is increased, the current flowing through the first resistor R1 is increased, so that the voltage at two ends of the first resistor R1 is increased, and the voltage Vout (i.e., the input voltage of the LED light bar 300) output by the ac-dc conversion circuit module 100 is further increased, thereby increasing the driving voltage of the LED light bar 300, so that the driving voltage of the LED light bar 300 is adjustable, and the brightness of the LED light bar 300 is adjustable.
Therefore, when the LED light bar 300 needs to adjust the brightness, the input voltage of the LED light bar 300 is Vout (1+ R1/R2) × V2+ R1 × I1.
In an embodiment, the method for the LED driving control chip 200 to obtain the first current I1 is to pump the current through the connection point a. For example, the LED driving control chip 200 may extract the maximum load capacity 255uA, and each time the load is adjusted to 1uA, the LED driving control chip 200 may obtain the first current I1 by dividing into 255 steps. Thus, the specific first current magnitude may be expressed as: i1 ═ N × 1uA, N is the number of steps of the LED driving control chip 200 from the connection point a. By means of the method, the order of the driving voltage of the LED lamp strip can be adjusted more flexibly, and the brightness of the LED lamp strip can be adjusted more flexibly to better meet the practical requirement. In practical applications, the maximum load current of the LED driving control chip and the minimum current per load may depend on practical applications, and are not limited to the above description.
In summary, the LED power circuit of the present invention can achieve the brightness adjustment of the LED only through the two circuit modules, i.e., the ac-dc conversion circuit and the LED driving chip. The LED driving chip is directly arranged on the TL431 in the alternating current-direct current conversion circuit framework, so that the driving voltage of the LED can be adjusted, and a plurality of groups of direct current-direct current conversion circuits are omitted. The LED power supply circuit design reduces the increase of the internal circuit space occupied by the LED brightness adjusting circuit and reduces the cost.
The present invention is capable of other embodiments, and various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention.
Claims (10)
1. An LED power circuit, comprising:
an LED light bar;
the LED driving control chip is electrically connected with the LED lamp bar and used for adjusting the brightness of the LED lamp bar;
the alternating current-direct current conversion circuit module comprises a conversion circuit, the conversion circuit is electrically connected with the LED lamp strip, and the conversion circuit is used for converting commercial alternating current into direct current to be used as input voltage of the LED lamp strip;
the ac-dc conversion circuit module further includes a TL431 circuit, the LED driving control chip is electrically connected to the TL431 circuit, and the LED driving control chip outputs a first voltage to the TL431 circuit for adjusting the magnitude of the input voltage of the LED light bar.
2. The LED power circuit as claimed in claim 1, wherein the LED driving control chip comprises a voltage feedback terminal electrically connected to the TL431 circuit.
3. The LED power circuit of claim 1, wherein the ac-dc converter circuit further comprises a first resistor and a second resistor, a first end of the first resistor is connected to the output end of the ac-dc converter circuit, and a second end of the first resistor is connected to the TL431 circuit; the first terminal of the second resistor is connected to the TL431 circuit, and the second terminal of the second resistor is connected to ground.
4. The LED power circuit as claimed in claim 3, wherein the first resistor, the second resistor and the TL431 circuit are electrically connected to a connection point, and the LED driving control chip is electrically connected to the connection point.
5. The LED power supply circuit of claim 4 wherein the LED drive control chip draws the first current from the connection point.
6. The LED power circuit as claimed in claim 5, wherein the LED driving control chip is configured to obtain the first current from the connection point by means of load pumping.
7. The LED power circuit as claimed in claim 5, wherein the first current increases when the LED driving control chip controls the first voltage to increase.
8. The LED power circuit as claimed in claim 6, wherein when the first current increases, the current flowing through the first resistor increases, thereby increasing the voltage of the first resistor and further increasing the input voltage.
9. The LED power circuit of claim 4, wherein the connection point has a second potential.
10. The LED power circuit of claim 9 wherein the second potential is a fixed potential.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010118591.8A CN113316289B (en) | 2020-02-26 | 2020-02-26 | LED power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010118591.8A CN113316289B (en) | 2020-02-26 | 2020-02-26 | LED power supply circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113316289A true CN113316289A (en) | 2021-08-27 |
| CN113316289B CN113316289B (en) | 2024-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010118591.8A Active CN113316289B (en) | 2020-02-26 | 2020-02-26 | LED power supply circuit |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202374188U (en) * | 2011-12-26 | 2012-08-08 | 王雁尘 | Triac-controlled capacitor step-down high-efficiency direct current power supply |
| CN103037576A (en) * | 2012-11-29 | 2013-04-10 | 余姚亿威电子科技有限公司 | LED constant current driving power supply circuit |
| CN104918391A (en) * | 2015-07-06 | 2015-09-16 | 高志敏 | LED constant-voltage and constant-current driving power supply |
| CN105960070A (en) * | 2016-07-13 | 2016-09-21 | 福建捷联电子有限公司 | Single-feedback direct-push type DC light-dimming LED tube driving circuit |
| CN205912292U (en) * | 2016-07-13 | 2017-01-25 | 福建捷联电子有限公司 | Straight pushing -type DC of single feedback LED fluorescent tube drive circuit that adjusts luminance |
-
2020
- 2020-02-26 CN CN202010118591.8A patent/CN113316289B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202374188U (en) * | 2011-12-26 | 2012-08-08 | 王雁尘 | Triac-controlled capacitor step-down high-efficiency direct current power supply |
| CN103037576A (en) * | 2012-11-29 | 2013-04-10 | 余姚亿威电子科技有限公司 | LED constant current driving power supply circuit |
| CN104918391A (en) * | 2015-07-06 | 2015-09-16 | 高志敏 | LED constant-voltage and constant-current driving power supply |
| CN105960070A (en) * | 2016-07-13 | 2016-09-21 | 福建捷联电子有限公司 | Single-feedback direct-push type DC light-dimming LED tube driving circuit |
| CN205912292U (en) * | 2016-07-13 | 2017-01-25 | 福建捷联电子有限公司 | Straight pushing -type DC of single feedback LED fluorescent tube drive circuit that adjusts luminance |
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| Publication number | Publication date |
|---|---|
| CN113316289B (en) | 2024-07-16 |
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