CN110809343A

CN110809343A - Control method for gradually-lighting and gradually-dimming LED (light emitting diode) illumination

Info

Publication number: CN110809343A
Application number: CN201911260707.5A
Authority: CN
Inventors: 江一奇
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-12-10
Filing date: 2019-12-10
Publication date: 2020-02-18

Abstract

When the human eyes are in a specific light environment for a long time, the human eyes adapt to the specific light environment, the vision of the human eyes is affected by sudden darkness or strong light irradiation, and the human eyes need time to adapt again. The invention discloses a method for controlling a gradually-lighting and gradually-dimming type of LED illumination, and relates to the technical scheme of change of a gradually-lighting and gradually-dimming mode of light during turning on and turning off of a lamp, sending and detecting of a lamp turning-off signal, delayed power failure during turning off of the lamp and the like in an illumination system. As shown in fig. 1, the innovative design of the circuits of the switch control part, the transmission line and the lamp circuit part in the existing LED control system mainly makes the light gradually change when the switch of the switch control part is turned on or turned off, so as to increase the comfort of human eyes, fully exert the advantages of LED lighting, and promote the popularization of the LED lighting technology in the lighting market.

Description

Control method for gradually-lighting and gradually-dimming LED (light emitting diode) illumination

Technical Field

The invention belongs to the technical field of automatic lighting control, and relates to the technical scheme of light gradual-on and gradual-off change, light-off signal transmission and detection, light-off delayed power-off and the like in a lighting system.

Background

After the lamp is turned on at dark night, the suddenly lightened lamp light can prick eyes to be uncomfortable; after the lamp is turned off, the eyes are suddenly painted black, and the eyes can recover after waiting for a long time, which is very difficult to feel. The technical and scientific puzzles are described as follows: the human eyes can adapt to a specific light environment for a long time, the vision of the human is affected by sudden darkness or strong light irradiation, and the human eyes need time to adapt again. The strong light suddenly irradiates the eyes, the photosensitive pigment in the retina of the eyeball is quickly decomposed after the eyes are irradiated by the strong light, and the strong light causes damage to the cornea and the iris of the human eyes, so that the sensitivity of the retina to the dark light is quickly reduced, visual disturbance occurs in a short time, and transient blindness can be caused seriously. Therefore, when the eye is irradiated by strong light, the eye feels painful and can recover normal vision after a period of time. Such as snow blindness, is a condition in which the retina is stimulated by intense light to cause temporary blindness. A desk lamp or a lamp capable of manually adjusting light can be used for preventing eyes from being injured by sudden brightness of light. However, such lamps have certain limitations, firstly, such dimming can only be used for halogen lamps, and halogen bulbs are limited in production and use by many countries due to large energy consumption; secondly, the dimming mode can only be carried out manually, and is inconvenient to use.

Disclosure of Invention

The purpose of the invention is as follows: when the switch is closed or opened, the lamp is turned on or off in a gradually-on or gradually-off mode, so that the eyes are prevented from being injured by sudden brightness of the lamp, and the comfortableness of the lamp is improved. Aiming at the characteristics of high brightness and quick starting of the LED lamp, the invention solves the problem that the LED illuminating lamp with larger luminous power is damaged to human eyes by quick brightness and quick darkness, and designs a brand-new gradually-lighting type LED illuminating system, so that when the lamp is turned on, the light is automatically gradually lightened from darkness, and when the lamp is turned off, the light is gradually lightened from brightness.

The solution is as follows:

the LED lighting circuit can be divided into three parts, namely a switch control part, a transmission line and a lamp circuit part, wherein the switch control part in the existing lighting scheme is roughly divided into three schemes of ① switches for connecting or disconnecting a power supply, ② switches with a function of time delay lamp closing and ③ switches capable of adjusting the brightness of the lamp, the transmission line generally comprises two parts, namely a zero line, a live line or an anode and a cathode, the lamp circuit part converts alternating current or higher voltage direct current into lower voltage direct current for lighting the LED lamp, and different from the existing scheme, the LED lighting dimming control method can greatly change the lamp circuit part and modify or redefine the switch control part and the transmission line.

(1) The power switch is closed, each channel is electrified and started, and the control unit of the lamp circuit part enables the lamp light to be fully bright or reach a preset brightness value by adjusting the duty ratio of the LED power supply current from small to large or adjusting the output power of the LED from small to large;

(2) when the lamp is turned off, the switch is switched off, the switch control part switches the power supply to another path for power supply, the original power supply waveform is changed or a specific signal (generally called as a lamp turning-off signal) is loaded, the delay circuit starts timing, the lamp turning-off signal is transmitted to the lamp circuit part through the transmission line, the lamp control unit detects the lamp turning-off signal, the duty ratio of the LED power supply current is adjusted to be smaller or the LED output power is adjusted to be smaller, the lamp light is completely extinguished or reaches a certain preset lower brightness value, and the switch control part stops supplying power to the lamp circuit part after the delay time of the switch control part is up;

(3) the process of gradually lightening and gradually darkening the light is realized by adjusting the power supply duty ratio of the LED or adjusting the output power of the LED and adding proper time delay, and the process can be realized by adopting a microprocessor with PWM (pulse width modulation), a chip with PWM, a timing or time delay analog PWM function of the microprocessor, changing the output power of the light by an I/O port of the microprocessor, and a special circuit or a special module;

(4) the power supply circuit of the switch control part is provided with two paths, one path supplies power to the lamp through the closing of the switch, the closing of the relay and the conduction of the silicon controlled rectifier or the MOS tube, and the path is the power supply circuit in the process of turning on the lamp or continuously lighting the lamp; the other way is a lamp-turning-off power supply path, and the lamp is supplied with power by controlling the conduction angle of the controlled silicon, flowing through the diode or changing the power supply mode through the MOS tube, and the lamp is characterized in that: when the switch is disconnected, the circuit is automatically started, the circuit has a delay function, and the power supply is automatically disconnected after the delay time is up, and the path power supply and the power supply path power supply for turning on the lamp can not be the same power supply;

(5) the transmission of the light-off signal can be realized in three ways, namely ① using a power transmission line in the lighting circuit, ② adding a light-off signal transmission line, ③ transmitting the light-off signal to the light circuit part by a radio or infrared transmission mode;

(6) the ideal lamp turning-off process of the system is that the power supply is cut off immediately, the lamp is still in the lighting state, so the delay time of the delay circuit is as short as possible, but the time required by the lamp dimming process is as long as possible, and an energy storage component can be added in the circuit according to the requirement. Because the service life of the electrolytic capacitor is shorter than that of the LED lamp, the method adopted by the scheme is as follows: after receiving the light-off signal, the electrolytic capacitor is started to charge, and the power supply is discharged after being powered off so as to prolong the lighting time of the LED, so that the service life of the electrolytic capacitor is prolonged. It should be noted that the electrolytic capacitor may be replaced by another energy storage device with a larger number of charging and discharging times, and the additional energy storage device is not necessary for the lamp circuit.

The technical effects are as follows:

the existing LED illuminating lamp: when the lamp is turned on, the lamp is immediately turned on, and when the lamp is turned off, the lamp is immediately turned off or after time delay, the lamp is immediately turned off. Compared with the prior art, the invention has the following beneficial effects:

(1) when the lamp is turned on, the light gradually brightens, and the human eyes do not feel stabbing pain caused by sudden brightening of the light, so that the comfort is obviously improved;

(2) when the lamp is turned off, the light gradually becomes dark, and the human eyes do not generate visual disturbance due to sudden dimming of the light, so that the lamp is quickly adapted to the surrounding environment;

(3) the switch position of lamp is usually installed at the door frame limit, and the person who shuts off the lamp from the position of shutting off the lamp arrival destination then need walk a section dark way, and this has just brought very big inconvenience for him, and this innovation scheme is because the existence of time delay outage, and the effectual inconvenience of having solved the light of shutting off gives people daily life and has brought the convenience of reality.

The specific implementation mode is as follows:

the circuit implementation of the invention is described in detail below by way of example, as shown in fig. 2, wall switch (11) size 10a 220V; the type of the diode (12) is IN 4007; (13) and (19) a power module of AC 220V-DC 12V 300mA is adopted; (14) and (17) using NMOS transistor as switch; the specification of the relay (15) is 12V 10A; (16) a 555 time delay circuit is adopted; the circuit (18) consists of a diode and a relay, the relay is attracted when the switch is closed, the relay is released after the switch is disconnected, and 220V current flows through the diode to form a half wave; the circuit (20) uses a diode, so that the power supply module (13) can continue to work after the switch is disconnected; the specification of the power supply module (22) is AC220V converted into DC 12V/2A; the circuit (23) detects a light-off signal by using a zero-crossing detection circuit; the central processing unit (24) is realized by a singlechip; the circuit (25) uses NMOS tube to execute the light fade-in and light-out; the backup power supply (26) realizes time delay by a set of electrolytic capacitors of 1000 uF/25V. The circuit execution flow is as follows:

the action effect is as follows: the lamp light gradually becomes bright when the lamp is turned on, and the lamp light gradually becomes dark when the lamp is turned off and the power is cut off in a delayed manner.

Drawings

FIG. 1 is a schematic diagram of a structure of a dimming LED lighting control system;

FIG. 2 is a schematic diagram of an actual manufacturing example structure of a dimming LED lighting control system;

in the figure: 1. the LED lamp comprises a power supply, 2, a power supply second path (lamp-off signal generation + time delay + switch control), 3, a power supply first path (switch), 4, an illumination transmission wire, 5, a voltage-stabilizing direct-current power supply, 6, a lamp-off signal detection circuit, 7, a central processing unit, 8, a lamp light adjusting hardware execution circuit and 9, an LED lamp bead combination;

10. the LED lamp comprises an alternating current 220V power supply, 11 lamp switches, 12 diodes, 13 power modules 1 and 14 relay start-stop control circuits, 15 relays, 16 delay circuits, 17 delay start-up control circuits, 18 lamp turn-off signal generating circuits, 19

power modules

2 and 20 alternating current feedback circuits, 21 lighting transmission wires, 22 power modules 3 and 23 lamp turn-off signal detection circuits, 24 central processing units, 25 lamp light adjusting hardware execution circuits, 26 LED supplementary power supplies after alternating current power failure, and 27 LED lamp bead combinations.

Claims

1. A gradually-bright and gradually-dark control method for LED illumination is characterized in that:

(2) when the lamp is turned off, the switch is switched off, the switch control part switches the power supply to another path for power supply, the original power supply waveform is changed or a specific signal (generally called as a lamp turning-off signal) is loaded, the delay circuit starts timing, the lamp turning-off signal is transmitted to the lamp circuit part through the transmission line, the lamp control unit detects the lamp turning-off signal, the duty ratio of the LED power supply current is adjusted to be smaller or the LED output power is adjusted to be smaller, the lamp light is completely extinguished or reaches a certain preset lower brightness value, and the switch control part stops supplying power to the system after the delay time is up;

(3) the process of the gradual lightening and the gradual darkening of the lamp is realized by adjusting the power supply duty ratio of the LED or adjusting the output power of the LED and adding proper time delay in the lamp circuit part, and the process can be realized by adopting a microprocessor with PWM, a chip with PWM, a timing or time delay analog PWM function of the microprocessor, changing the output power of the lamp by an I/O port of the microprocessor, and a special circuit or a special module;

(4) the power supply circuit of the switch control part is provided with two paths, one path supplies power to the lamp through the closing of the switch, the closing of the relay and the conduction of the silicon controlled rectifier or the MOS tube, and the path is the power supply circuit in the process of turning on the lamp or continuously lighting the lamp; the other way is a lamp-turning-off power supply path, and the lamp is supplied with power by controlling the conduction angle of the controlled silicon, flowing through the diode or changing the power supply mode through the MOS tube, and the lamp is characterized in that: when the switch is disconnected, the circuit is automatically started, has a delay function, and automatically disconnects the power supply after the delay time is up;

(5) the transmission of the light-off signal can be achieved in three ways: (1) utilizing a power transmission line in the lighting circuit; (2) adding a lamp-off signal transmission line; (3) transmitting a lamp-off signal to the lamp circuit part by means of radio or infrared transmission; it should be noted that the signal source of the light-off signal is not limited to the generation of the switch control part of the system, and may be generated by other circuits outside the system and sent to the light circuit part through the above three ways, and the light-off is performed in a gradually-dimming manner;

(6) the ideal lamp turn-off process is that the switch is switched off to cut off the power supply immediately, the lamp is still kept in the lighting state, so the delay time of the delay circuit is possibly short, but the time required by the gradual dimming process of the lamp is as long as possible, and an energy storage component can be added in the circuit according to the requirement. After receiving a light-off signal, starting the electrolytic capacitor to charge, discharging after the power supply is powered off, and prolonging the lighting time of the LED, so as to prolong the service life of the electrolytic capacitor; it should be noted that the electrolytic capacitor may be replaced by another energy storage device with a larger number of charging and discharging times, and the additional energy storage device is not necessary for the lamp circuit.

2. The method as claimed in claim 1, wherein the lighting process is performed by automatically increasing the brightness of the light from zero or a certain value, gradually increasing the brightness, and turning the light to full brightness.

3. The method as claimed in claim 1, wherein the turning off of the LED lamp is performed by automatically decreasing the brightness of the LED lamp from a certain value, gradually dimming the LED lamp, and finally turning off the LED lamp.

4. The method as claimed in claim 1, wherein the LED lighting system using the dimming control method is applicable to an AC 75V-275V power supply circuit.

5. The method as claimed in claim 1, wherein the dimming control system is adapted to a DC power supply circuit.

6. The method of claim 1, wherein the method of turning on or off the LED lamp is applicable to other light sources.

7. The method of claim 1, wherein the circuitry is configured to transmit a specific signal by changing the waveform of the AC power.

8. The method for controlling the dimming of an LED lighting device according to claim 1, wherein an electrolytic capacitor or a chargeable and dischargeable component of the lamp circuit is mainly used for keeping the LED on and prolonging the lamp-out time after the switch control part is powered off.

9. The method as claimed in claim 1, wherein the switch control portion comprises a first path power supply and a second path power supply.