CN211959622U - LED two-section type dimming circuit adopting public line and bus short circuit connection control - Google Patents
LED two-section type dimming circuit adopting public line and bus short circuit connection control Download PDFInfo
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- CN211959622U CN211959622U CN202020799486.0U CN202020799486U CN211959622U CN 211959622 U CN211959622 U CN 211959622U CN 202020799486 U CN202020799486 U CN 202020799486U CN 211959622 U CN211959622 U CN 211959622U
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- public line
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- cpu chip
- short circuit
- connection control
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Abstract
The utility model provides an adopt public line, two segmentation dimmer circuit of LED of generating line short circuit connection control, adopt the CPU chip that has output PWM signal function, the output of CPU chip PWM signal connects the LED lamp and supplies step-down constant current circuit, establishes the control foot of CPU chip into public line, and the ground foot of CPU chip is established to the generating line, makes public line, generating line short circuit, reaches two sections dimmer functions. 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-section dimming circuit adopting the short-circuit connection control of the public line and the bus adopts a CPU chip with the function of outputting PWM signals, the output of the PWM signals of the CPU chip is connected with an LED lamp voltage-reducing constant current circuit, the control pin of the CPU chip is set as the public line, the grounding pin of the CPU chip is set as the bus, the public line and the bus are short-circuited, and the two-section dimming function is achieved.
The utility model has the advantages that, production is simple to customer's installation operation is also simple.
Drawings
FIG. 1 is a schematic circuit for implementing two-stage dimming by using a single chip;
FIG. 2 is a schematic circuit diagram of an embodiment;
the reference numbers in the figures illustrate:
1-green line (chip 2 pin, or public line); 2-black line (chip 8 pin, or bus or ground wire) and 3-singlechip 5 pin, and outputs PWM pulse modulation signal.
Detailed Description
As shown in figure 1, the model of the single chip microcomputer is MS16M 685; the pin 1 of the singlechip is a power supply pin, the pin 2 is a control pin, the pin 4 is a DIM pin, the pin 5 is a PWM output pin, and the pin 8 is a GND grounding pin.
The 2 pin is a green line and is set as a public line, the 8 pin is a black line and is set as a bus (a ground line), the singlechip is started through the 1 pin input,
the 4 pins input dimming signals, and the 5 pins output PWM signals to supply the LED lamp voltage reduction constant current circuit.
The second mode is realized by short circuit of a public line (2 pins and a green line) of the singlechip to the ground (8 pins and a black line of the singlechip)
The LED lamp is controlled to be dimmed by the gear current.
The short circuit of the 2 feet to the 8 feet of the singlechip changes the high and low level of the control foot 2 of the singlechip, thereby changing the singlechip
The internal calculation mode multiplies a coefficient on the basis of the original gear current, changes the duty ratio of the PWM signal,
therefore, the current value for driving the LED is changed, and the two-section type dimming function is realized.
During operation, the two-section LED lamp dimming can be realized only by short-circuiting the wire head 1 (green wire) and the wire head 2 (black wire) of the ground wire.
Claims (1)
1. The LED two-section dimming circuit adopting the short-circuit connection control of the public line and the bus adopts a CPU chip with the function of outputting PWM signals, and is characterized in that the output of the PWM signals of the CPU chip is connected with an LED lamp voltage-reducing constant-current circuit, the control pin of the CPU chip is set as the public line, the grounding pin of the CPU chip is set as the bus, the public line and the bus are short-circuited, and the two-section dimming function is achieved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020799486.0U CN211959622U (en) | 2020-05-14 | 2020-05-14 | LED two-section type dimming circuit adopting public line and bus short circuit connection control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020799486.0U CN211959622U (en) | 2020-05-14 | 2020-05-14 | LED two-section type dimming circuit adopting public line and bus short circuit connection control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211959622U true CN211959622U (en) | 2020-11-17 |
Family
ID=73170521
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020799486.0U Active CN211959622U (en) | 2020-05-14 | 2020-05-14 | LED two-section type dimming circuit adopting public line and bus short circuit connection control |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211959622U (en) |
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2020
- 2020-05-14 CN CN202020799486.0U patent/CN211959622U/en active Active
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