CN212812085U

CN212812085U - Lighting control system capable of gradually brightening and gradually darkening after induction

Info

Publication number: CN212812085U
Application number: CN202021996895.6U
Authority: CN
Inventors: 刘建清
Original assignee: Zhongshan Ximubei Lighting Co ltd
Current assignee: Zhongshan Ximubei Lighting Co ltd
Priority date: 2020-09-14
Filing date: 2020-09-14
Publication date: 2021-03-26
Anticipated expiration: 2030-09-14

Abstract

The utility model relates to a lighting control system that gradually brightens and gradually dims after induction, including induction module and LED module, the gate pole of first MOSFET is connected to the output of induction module, and MCU input end is connected to the source electrode of first MOSFET, and MCU outputs the PWM waveform that the duty cycle changes; the output end of the MCU is connected with the input end of the current type PWM control chip, the current type PWM control chip outputs PWM waveforms with variable duty ratios, the output end of the current type PWM control chip is connected with a gate pole of the second MOSFET, and a drain electrode of the second MOSFET is connected with the LED module. The utility model discloses a lighting system, through the induction signal control lamp bright gradually or gradually dark, naked eye discomfort and dizzy light effect that can furthest's reduction brought by change of luminance in the twinkling of an eye have effectively reduced the vision blind area, can keep the space perception more balanced.

Description

Lighting control system capable of gradually brightening and gradually darkening after induction

Technical Field

The utility model relates to the field of lighting technology, concretely relates to illumination control system who brightens gradually and gradually dim after the response.

Background

The lighting system of most public places is designed into induction type lighting for energy saving and consumption reduction, some induction type lighting lamps at present adopt pyroelectric human body induction lamps, some adopt radar induction lamps, but the control of the induction lighting system on the existing market generally adopts the mode of lighting by human, and the lamp is turned off when people walk, namely the control lamp is turned on and off instantly, although energy is seemingly saved, the change of lighting and turning off instantly in the dark environment can cause discomfort of naked eyes, the stimulation to the light sensation of human eyes is large, and visual blind areas or even brief blindness can be easily generated. In addition, the existing control mode mainly controls the primary side through the optocoupler by the secondary side, controls the transistor to output PWM and duty ratio, and enables the secondary side output voltage to change, so that the brightness of the lamp of the lighting system is controlled, and the stroboscopic phenomenon of the lighting lamp can occur due to the control mode.

SUMMERY OF THE UTILITY MODEL

In view of the weak point that exists among the above-mentioned prior art, the utility model discloses a lighting control system who brightens gradually and gradually dim after the response, the electric current size through the control lamp changes the gradually bright or gradually dim that realizes the lamp, reduces the stimulation to people's eye, also can not produce stroboscopic phenomenon.

In order to realize the above purpose, the utility model discloses the technical scheme who adopts is:

a lighting control system capable of gradually brightening and dimming after induction comprises an induction module and an LED module, wherein the output end of the induction module is connected with a gate pole of a first MOSFET, a source pole of the first MOSFET is connected with an MCU input end, and the MCU outputs a PWM waveform with a variable duty ratio; the output end of the MCU is connected with the input end of the current type PWM control chip, the current type PWM control chip outputs PWM waveforms with variable duty ratios, the output end of the current type PWM control chip is connected with a gate pole of the second MOSFET, and a drain electrode of the second MOSFET is connected with the LED module.

Further, the MCU adopts an STM8S003F3 chip.

Further, the current mode PWM control chip adopts an HG13894 chip.

Furthermore, the output end of the MCU is connected with the input end of the current type PWM control chip through a filter circuit.

Further, when the input end of the MCU inputs a low level, the output end of the MCU outputs a PWM waveform with the amplitude of 20% to 100% gradually changed; when the input end of the MCU inputs a high level, the output end of the MCU outputs a PWM waveform with the amplitude of 100-20% gradually changed.

The utility model discloses an illumination system extensively is applicable to the effect of large-scale chain supermarket, brand monopoly store lighting, hotel's meeting place corridor light control, underground parking garage and large-scale specialty exhibition district and presents, and is bright gradually or gradually dark through the inductive signal control lamp, and the reduction that can furthest is discomfortable by the naked eye that brightness variation brought in the twinkling of an eye and dizzy light effect have effectively reduced the vision blind area, can keep the space perception more balanced.

Drawings

Fig. 1 is a circuit diagram of an illumination system in an embodiment.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

The embodiment discloses a lighting control system capable of gradually brightening and gradually darkening after induction, which comprises an induction module and an LED module, wherein the output end of the induction module is connected with a gate pole of a MOSFET1, the source electrode of a first MOSFET is connected with the input end of an MCU, and the MCU outputs a PWM waveform with a variable duty ratio; the output end of the MCU is connected with the input end of the current type PWM control chip through the filter circuit, the current type PWM control chip outputs PWM waveforms with variable duty ratios, the output end of the current type PWM control chip is connected with a gate pole of the MOSFET2, and a drain electrode of the second MOSFET is connected with the LED module. In this embodiment, the MCU is an STM8S003F3 chip, and the current PWM controller is an HG13894 chip manufactured by taiwan spacious technology.

When a human body walks into the sensing range of the sensing module, the sensing module can output a high level after sensing a signal, the high level voltage signal is input to a gate pole of a MOSFET1 (N-channel MOSFET) through a resistor R36, the source pole of the MOSFET1 is changed from the original high level to a low level after being conducted, a pin A of an MCU with an ADC function connected with the source pole of the MOSFET1 is also at the low level, and after the low level signal of the pin A is detected by the MCU, a PWM waveform with the duty ratio changed from 20% to 100% is output by a pin B after being delayed through a delay circuit inside the MCU. The PWM waveform output by the pin B is filtered by a resistor and a capacitor and then converted into a smooth direct current voltage to control the EN pin of the current type PWM control chip, after the current type PWM control chip detects the converted corresponding voltage, the DR pin outputs the PWM waveform with the corresponding duty ratio to control the gate pole of the MOSFET2, and the MOSFET2 controls the current of the LED module to change from small to large, so that the brightness of the LED is gradually changed from dark to bright.

When the human body goes out of the induction range or does not have an inductible signal in the induction range, the LED module is similar by the process of bright darkening, namely: at the moment, the induction module outputs a low level, the MOSFET1 cannot be switched on, the source electrode of the MOSFET1 is a high level, the pin A of the MCU is also a high level, the pin B of the MCU outputs a PWM waveform with the duty ratio from 100% to 20%, the pin DR of the current type PWM control chip also outputs a corresponding PWM waveform to drive the gate of the MOSFET2, and the current of the LED module is controlled to change from large to small by controlling the switching-on time of the MOSFET2, so that the gradual change of the brightness of the lamp from full brightness to dimming is realized.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a bright gradually and illumination control system gradually dark after response, includes response module and LED module, its characterized in that: the output end of the induction module is connected with a gate pole of a first MOSFET, a source pole of the first MOSFET is connected with the input end of an MCU, and the MCU outputs a PWM waveform with variable duty ratio; the output end of the MCU is connected with the input end of the current type PWM control chip, the current type PWM control chip outputs PWM waveforms with variable duty ratios, the output end of the current type PWM control chip is connected with a gate pole of the second MOSFET, and a drain electrode of the second MOSFET is connected with the LED module.

2. The system of claim 1, wherein the lighting control system is configured to sense the fade-on and fade-off, and further configured to: the MCU adopts an STM8S003F3 chip.

3. The system of claim 1, wherein the lighting control system is configured to sense the fade-on and fade-off, and further configured to: the current type PWM control chip adopts an HG13894 chip.

4. The system of claim 1, wherein the lighting control system is configured to sense the fade-on and fade-off, and further configured to: and the output end of the MCU is connected with the input end of the current type PWM control chip through a filter circuit.

5. The system of claim 1, wherein the lighting control system is configured to sense the fade-on and fade-off, and further configured to: when the input end of the MCU inputs a low level, the output end of the MCU outputs a PWM waveform with the amplitude of 20-100% gradually changed; when the input end of the MCU inputs a high level, the output end of the MCU outputs a PWM waveform with the amplitude of 100-20% gradually changed.