CN212115724U

CN212115724U - Brightness adjusting circuit for LED

Info

Publication number: CN212115724U
Application number: CN202021211760.4U
Authority: CN
Inventors: 江欣
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-06-24
Filing date: 2020-06-24
Publication date: 2020-12-08
Anticipated expiration: 2030-06-24

Abstract

The utility model discloses a brightness adjusting circuit for LED, which comprises a power circuit, a light intensity detection circuit, a control circuit and a plurality of driving circuits with the same structure; the power supply circuit is respectively connected with the light intensity detection circuit, the control circuit and each driving circuit, the light intensity detection circuit and each driving circuit are also respectively connected with the control circuit, and the output end of each driving circuit is connected with the corresponding LED lamp string; the effect is as follows: the light intensity detection circuit is used for detecting the external real-time environment, and the processor is used for controlling each driving circuit to further realize the automatic adjustment of the LED brightness and the on-off of the corresponding LED lamp string, so that the defects of light pollution and power resource waste in the prior art are overcome.

Description

Brightness adjusting circuit for LED

Technical Field

The utility model belongs to the technical field of the LED lamp, concretely relates to a brightness control circuit for LED.

Background

With the development of lighting technology, LEDs are applied to various display screens, and LED display has become an important means for information dissemination, and is widely applied to public places needing service propaganda indoors and outdoors. However, in the prior art, the brightness of many outdoor LED advertisement display screens is the same no matter in daytime or at night, so that the LED display is too bright at night, which brings the corresponding viewing discomfort and light pollution, and the display screens are not easy to see clearly in daytime, thereby bringing the light pollution and causing the defect of power resource waste.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problems, the present invention provides a brightness adjusting circuit for LED to overcome the defects of light pollution and power resource waste existing in the prior art.

The utility model discloses the technical scheme who takes does: a brightness adjusting circuit for an LED comprises a power supply circuit, a light intensity detection circuit, a control circuit and a plurality of driving circuits with the same structure; the power supply circuit is respectively connected with the light intensity detection circuit, the control circuit and each driving circuit, the light intensity detection circuit and each driving circuit are also respectively connected with the control circuit, and the output end of each driving circuit is connected with the corresponding LED lamp string.

Preferably, the power supply circuit adopts a direct current processing circuit, the direct current processing circuit comprises a TPS62111RSA chip, an external input power supply is connected with the input end of the TPS62111RSA chip after being filtered by a capacitor, and the output end of the TPS62111RSA chip is output after passing through an LC filter circuit.

Preferably, the light intensity detection circuit comprises a TSL2561 chip, and the TSL2561 chip passes through I of the chip²The C interface is connected with the control circuit, I²And the C interface is also connected with a power supply VCC of the TSL2561 chip through a pull-up resistor respectively.

Preferably, the control circuit comprises a controller that employs STM32F103, comprising a plurality of PWM channels.

Preferably, the PWM channels of the controller are correspondingly connected to the input terminals of the respective driving circuits.

Preferably, the driving circuit includes an LED driving chip, the LED driving chip employs an RX5801, an OE terminal of the RX5801 is connected with a PWM channel of the controller, and an OUT terminal of the RX5801 is connected with a corresponding LED light string.

Preferably, the Rext terminal of RX5801 is grounded through a resistor.

By adopting the technical scheme, the method has the following advantages: the utility model provides a luminance regulating circuit for LED utilizes light intensity detection circuit to detect outside real-time environment, utilizes the treater to pass through each drive circuit of control simultaneously, and then realizes the automatically regulated of LED luminance and the break-make that corresponds the LED lamp cluster to the light pollution that exists among the prior art and the defect of electric power resource waste have been overcome.

Drawings

Fig. 1 is a schematic structural diagram of a brightness adjusting circuit for an LED according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a light intensity detection circuit provided in an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a driving circuit provided in an embodiment of the present invention.

Detailed Description

To make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following detailed description will be made with reference to the accompanying drawings and specific embodiments, and the description herein does not mean that all the subject matters corresponding to the specific examples set forth in the embodiments are cited in the claims.

Referring to fig. 1 to 3, a brightness adjusting circuit for an LED includes a power circuit, a light intensity detecting circuit, a control circuit, and a plurality of driving circuits having the same structure; the power supply circuit is respectively connected with the light intensity detection circuit, the control circuit and each driving circuit, the light intensity detection circuit and each driving circuit are also respectively connected with the control circuit, and the output end of each driving circuit is connected with the corresponding LED lamp string.

When the circuit is applied, the power supply circuit adopts a direct current processing circuit, the direct current processing circuit comprises a TPS62111RSA chip, an external input power supply is connected with the input end of the TPS62111RSA chip after being filtered by a capacitor, and the output end of the TPS62111RSA chip is output after passing through an LC filter circuit; wherein, the external input power is input by a storage battery or an external power adapter.

In this embodiment, the light intensity detection circuit includes a TSL2561 chip, and the TSL2561 chip passes through its I²C interface andthe control circuit is connected with I²The interface C is also connected with a power supply VCC of the TSL2561 chip through a pull-up resistor respectively; the control circuit comprises a controller, wherein the controller adopts an STM32F103 and comprises a plurality of PWM channels; i.e. I of the TSL2561 chip²I with C interface corresponding to STM32F103²C, interface connection; the integrated A/D converter is integrated in the TSL2561 chip, digital signals are output, the cost is low, the anti-interference capability is high, and the outdoor ambient light condition can be detected in real time conveniently.

Further, referring to fig. 3, taking the structure of one of the driving circuits as an example for explanation, the PWM channels of the controller are correspondingly connected to the input terminals of the respective driving circuits;

the driving circuit comprises an LED driving chip, the LED driving chip adopts RX5801, an OE (enable) end of the RX5801 is connected with a PWM (pulse-width modulation) channel of the controller, a PWM1 is used for representing the PWM channel of the controller in fig. 3, and an OUT end of the RX5801 is connected with a corresponding LED lamp string; the Rext terminal of RX5801 is grounded through a resistor.

Therefore, the brightness of the LED can be conveniently adjusted according to the external environment condition, and one or more paths of LED lamp strings can be disconnected, so that better electric energy saving and brightness adjustment can be realized; for example, when no person is in the middle of night, the signal driving can be stopped, and a better energy-saving effect is achieved.

According to the scheme, the circuit can be integrated on the PCB, and the PCB has the advantages of low cost, strong flexibility and the like, and can adapt to various application scenes.

Finally, it should be noted that the above description is a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and scope of the present invention.

Claims

1. A brightness adjusting circuit for an LED is characterized by comprising a power supply circuit, a light intensity detection circuit, a control circuit and a plurality of driving circuits with the same structure; the power supply circuit is respectively connected with the light intensity detection circuit, the control circuit and each driving circuit, the light intensity detection circuit and each driving circuit are also respectively connected with the control circuit, and the output end of each driving circuit is connected with the corresponding LED lamp string.

2. The brightness adjusting circuit for the LED according to claim 1, wherein the power circuit adopts a DC processing circuit, the DC processing circuit comprises a TPS62111RSA chip, an external input power is connected with the input end of the TPS62111RSA chip after being filtered by a capacitor, and the output end of the TPS62111RSA chip is output after being filtered by an LC filter circuit.

3. The LED brightness adjusting circuit of claim 2, wherein the light intensity detecting circuit comprises a TSL2561 chip, and the TSL2561 chip is connected to the LED through its I²The C interface is connected with the control circuit, I²And the C interface is also connected with a power supply VCC of the TSL2561 chip through a pull-up resistor respectively.

4. A brightness adjustment circuit for LED according to claim 1, characterized in that the control circuit comprises a controller employing STM32F103 comprising a plurality of PWM channels.

5. A brightness regulating circuit for LED according to claim 4, characterized in that the PWM channels of the controller are connected to the input terminals of the respective driving circuits.

6. A brightness regulating circuit for LED according to claim 5, characterized in that said driving circuit comprises an LED driving chip, said LED driving chip adopts RX5801, OE terminal of RX5801 is connected with PWM channel of said controller, OUT terminal of RX5801 is connected with corresponding LED string.

7. A brightness adjusting circuit for LED as claimed in claim 6, characterized in that the Rext terminal of RX5801 is grounded through a resistor.