CN211959631U - Two-stage LED dimming circuit for controlling constant current source chip - Google Patents
Two-stage LED dimming circuit for controlling constant current source chip Download PDFInfo
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- CN211959631U CN211959631U CN202020800798.9U CN202020800798U CN211959631U CN 211959631 U CN211959631 U CN 211959631U CN 202020800798 U CN202020800798 U CN 202020800798U CN 211959631 U CN211959631 U CN 211959631U
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- current source
- constant current
- source chip
- dimming circuit
- led
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- 238000005070 sampling Methods 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000011218 segmentation Effects 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract description 2
- 238000005286 illumination Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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Abstract
The utility model provides a two segmentation dimmer circuits of LED are implemented to control constant current source chip, with two resistance R1A, R1B of the current sampling circuit connection of constant current source chip, one of them resistance ground connection makes another resistance ground connection or ungrounded, realizes two segmentation LED dimmer circuits. The utility model has the advantages that, production is simple to customer's installation operation is also simple.
Description
Technical Field
The utility model relates to a LED illumination mainly relates to two sections sectional type dimmer circuit of LED illumination.
Background
In the application of the LED driving power supply, with the more and more mature development of dimming products, sectional dimming products appear in front of people, and for the control mode of sectional dimming, the market commonly uses the control of an external shift switch, and the product customer operation of the external shift switch is simple, but the production is complex and troublesome.
Disclosure of Invention
For solving the problem that the production of the existing two-section sectional type dimming circuit is complicated and troublesome, the utility model provides a
The LED two-stage dimming circuit is characterized in that a constant current source chip is controlled to implement an LED two-stage dimming circuit, and a current sampling electrode of the constant current source chip is connected
Two resistors R1A, R1B, one of which is grounded and the other is grounded or not, so as to realize two
Segmentation LED dimmer circuit.
The utility model has the advantages that, production is simple to customer's installation operation is also simple.
Drawings
FIG. 1 is a circuit for implementing a two-stage dimming principle by using a constant current source chip;
FIG. 2 is a schematic circuit diagram of an embodiment;
the reference numbers in the figures illustrate:
a-pin 4 of the constant current source chip U1, and is grounded; and a current sampling electrode 3 pin CS pin of the B-constant current source chip U1.
Detailed Description
Referring to fig. 1, U1 (BUCK) is a constant current source chip BP3378A, pin 4 is a GND pin, pin 3 is a ground pin, and pin 3 is a current sampling electrode of the constant current source chip BP3378A, and the current sampling electrode pin 3 of the constant current source chip BP3378A is connected to two resistors R1A and R1B, wherein one resistor is grounded, and the other resistor is grounded or ungrounded, thereby implementing a two-stage LED dimming circuit.
The constant current source chip BP3378A calculates the output current flowing through the load by collecting the voltage values of the 3 pins and the 4 pins, and after the resistor R1B of the 3 pins is grounded, the resistance value of the sampling resistor R1A of the 4 pins is changed. Therefore, the voltage value of the acquisition 3 pins is changed, the output current flowing through the load is changed, and the two-stage dimming function of the LED is realized.
During operation, the two-section LED lamp dimming can be realized only by short-circuiting the wire head B (green wire) and the wire head A (black wire) of the ground wire.
Claims (1)
1. A two-section dimming circuit for controlling a constant current source chip to implement an LED is characterized in that a current sampling electrode of the constant current source chip is connected with two resistors R1A and R1B, one resistor is grounded, and the other resistor is grounded or ungrounded, so that the two-section LED dimming circuit is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020800798.9U CN211959631U (en) | 2020-05-14 | 2020-05-14 | Two-stage LED dimming circuit for controlling constant current source chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020800798.9U CN211959631U (en) | 2020-05-14 | 2020-05-14 | Two-stage LED dimming circuit for controlling constant current source chip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211959631U true CN211959631U (en) | 2020-11-17 |
Family
ID=73171778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020800798.9U Expired - Fee Related CN211959631U (en) | 2020-05-14 | 2020-05-14 | Two-stage LED dimming circuit for controlling constant current source chip |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211959631U (en) |
-
2020
- 2020-05-14 CN CN202020800798.9U patent/CN211959631U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201117 |