CN215121265U

CN215121265U - Dimming circuit for eliminating lamp noise

Info

Publication number: CN215121265U
Application number: CN202121385901.9U
Authority: CN
Inventors: 王帅; 隆新级; 梁家棋
Original assignee: Foshan Hanrun Zhiguang Technology Co ltd
Current assignee: Foshan Hanrun Zhiguang Technology Co ltd
Priority date: 2021-06-22
Filing date: 2021-06-22
Publication date: 2021-12-10
Anticipated expiration: 2031-06-22

Abstract

The utility model relates to a lamps and lanterns field of adjusting luminance discloses a eliminate dimmer circuit of lamps and lanterns noise. The utility model provides a eliminate dimmer circuit of lamps and lanterns noise includes the LED light source of electric connection, supply circuit, the DMX512 signal of input, still includes 485 communication circuit, control circuit, LED drive circuit and LED light source drive electric connection, and 485 communication circuit receives the DMX512 signal, and control circuit and 485 communication circuit communication connection control LED drive circuit, and LED drive circuit is equipped with the simulation dimmer circuit. The utility model controls the simulation light modulation set by the LED drive circuit by using the control circuit, the noise is extremely low in the light modulation process by using the simulation light modulation mode, and the light modulation process is smooth and has no jitter; and PWM dimming is adopted below 20 percent of dimming gray scale, so that dimming depth is ensured.

Description

Dimming circuit for eliminating lamp noise

Technical Field

The utility model relates to a LED field of adjusting luminance, in particular to eliminate dimmer circuit of lamps and lanterns noise.

Background

At present, two dimming modes of lamps in the market are mainly adopted, one mode is PWM dimming, and the other mode is analog dimming. Each of them has advantages and disadvantages, for example, the noise problem of the lamp adopting PWM dimming is serious, and the dimming depth of the lamp adopting analog dimming is insufficient. For the indoor lamp, the dimming depth and the noise have higher requirements, and because the indoor lamp is closely related to human life, the better dimming depth and the extremely low noise become the focus of measuring the quality of the dimming lamp. In order to meet the requirements of customers, how to design a dimming circuit to simultaneously have better dimming depth and extremely low noise is the technical problem to be solved by the application.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an eliminate light modulation circuit of lamps and lanterns noise of adjusting luminance.

In order to achieve the above object, the utility model discloses a following technical scheme, a eliminate dimming circuit of lamps and lanterns noise, including the DMX512 signal of LED light source, supply circuit, input of electric connection, still include 485 communication circuit, control circuit, LED drive circuit and LED light source drive electric connection, 485 communication circuit receives DMX512 signal, and control circuit and 485 communication circuit communication connection and control LED drive circuit, LED drive circuit are equipped with the simulation dimming circuit.

In some embodiments, an EMI circuit is also included, the EMI circuit electrically coupled with the LED light source.

In some embodiments, the control circuit includes an RDM module for online address code change.

In some embodiments, the control circuit is communicatively coupled to the LED driver circuit via the IO port.

In some embodiments, the control circuit is provided with a PWM output circuit.

In some embodiments, the 485 communication circuit is connected with a transient voltage suppressor T1 on an interaction path of a DMX512 signal receiving end, and the transient voltage suppressor T1 forms a clamp on an information interaction path.

In some embodiments, the control circuitry employs a STM8S103F2 type chip.

The utility model has the advantages that: the utility model relates to a eliminate light modulation circuit of lamps and lanterns noise, through the simulation light modulation that uses control circuit control LED drive circuit to set up, the noise is extremely low in this kind of simulation light modulation mode light modulation process, and the light modulation process is smooth and has not shaken; and PWM dimming is adopted below 20 percent of dimming gray scale, so that dimming depth is ensured.

Drawings

Fig. 1 is a schematic diagram of a circuit frame structure of a light modulation circuit for eliminating lamp noise according to the present invention;

fig. 2 is a schematic circuit diagram of the 485 communication circuit of the present invention;

fig. 3 is a schematic circuit diagram of the control circuit of the present invention;

fig. 4 is a schematic circuit diagram of the power supply circuit of the present invention;

FIG. 5 is a schematic diagram of the EMI circuit of the present invention;

fig. 6 is a schematic circuit diagram of an LED driving circuit of embodiment 1;

fig. 7 is a schematic circuit diagram of an LED driving circuit according to embodiment 2.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Example 1

As shown in figure 1, the dimming circuit for eliminating the lamp noise comprises an LED light source, a power supply circuit, an input DMX512 signal, a 485 communication circuit, a control circuit and an LED driving circuit which are electrically connected, wherein the LED driving circuit is electrically connected with the LED light source in a driving mode, the 485 communication circuit receives the DMX512 signal, the control circuit is in communication connection with the 485 communication circuit and controls the LED driving circuit, and the LED driving circuit is provided with an analog dimming circuit.

As shown in fig. 2, in order to prevent surge and over-strong access signal, the access signal 485 communication circuit is connected with a transient voltage suppressor T1 on the interaction path of the DMX512 signal receiving end, and the transient voltage suppressor T1 forms a clamp on the information interaction path.

The 485 communication circuit selects a chip with the model number of UN485E, receives DMX512 signals through a DBI \ DAI interface and sends the DMX512 signals to the MCU of the control circuit.

As shown in fig. 3, the control circuit adopts an MCU chip model of STM8S103F2,

the control circuit comprises an RDM module, and the RDM module is used for changing the online address code. The RDM module supports real-time voltage and current feedback, supports online address code change, and facilitates field debugging work and after-sale maintenance.

The control circuit is in communication connection with the LED drive circuit through the IO port.

The control circuit is provided with a PWM output circuit for PWM dimming output.

As shown in fig. 4, the power supply circuit realizes 5V power supply, and the chip model used is CJ78M 05.

As shown in fig. 5, an EMI circuit is also included, which is electrically coupled to the LED light source.

As shown in fig. 6, in the present embodiment, the LED driving circuit has a chip model of Hi9600, and after the MCU of the control circuit analyzes the DMX512 signal, the LED driving circuit is communicated through the IO port to perform dimming, so that when the dimming gray scale is more than 20%, the analog dimming is adopted, so that the noise is very low when the dimming is performed, and when the dimming gray scale is less than 20%, the PWM dimming is adopted, so that the lamp has a good dimming depth.

By adopting the dimming circuit of the embodiment, the noise of the dimming process of the lamp is extremely low, the dimming process is smooth and has no jitter, and the photographing has no stroboflash.

Example 2

The difference from embodiment 1 is that the LED driving circuit employed in embodiment 2 is different from embodiment 1.

As shown in fig. 7, the LED driving circuit adopts a chip of MBI6653, and supports analog dimming, and after the analog dimming, the noise of the lamp is very low during the dimming process, and the noise is hardly heard by human ears.

The LED driving circuit has a constant power function, and the power of the LED driving circuit is kept unchanged no matter how the color temperature of the lamp is changed, namely the brightness of the LED driving circuit is kept unchanged.

What has been described above are only some embodiments of the invention. For those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are within the scope of the invention.

Claims

1. The utility model provides a eliminate dimmer circuit of lamps and lanterns noise, includes the DMX512 signal of the LED light source of electric connection, supply circuit, input, its characterized in that still includes 485 communication circuit, control circuit, LED drive circuit and LED light source drive electric connection, 485 communication circuit receives the DMX512 signal, control circuit and 485 communication circuit communication connection and control LED drive circuit, LED drive circuit is equipped with the simulation dimmer circuit.

2. The dimming circuit for eliminating lamp noise as defined in claim 1, further comprising an EMI circuit electrically coupled to the LED light source.

3. The dimming circuit for eliminating lamp noise according to claim 1, wherein the control circuit comprises an RDM module, and the RDM module is used for online address code modification.

4. The dimming circuit of claim 1, wherein the control circuit is communicatively connected to the LED driving circuit via an IO port.

5. The dimming circuit for eliminating lamp noise according to claim 1, wherein the control circuit is provided with a PWM output circuit.

6. The dimming circuit of claim 1, wherein the 485 communication circuit is connected with a transient voltage suppressor T1 on the communication path of the DMX512 signal receiving end, and the transient voltage suppressor T1 forms a clamp on the information communication path.

7. The dimming circuit for eliminating lamp noise according to claim 1, wherein the control circuit employs a model STM8S103F2 chip.