The lamp adopts the unique digital stepless dimming system technology, and the user can set the brightness by himself only by rotating the lamp cap. The brightness transition is smooth, and there is no preset brightness limit.
In the process of automatic stepless dimming, once the output brightness of the flashlight meets the user's requirements, the user can immediately press the switch to turn off the flashlight, at which time the brightness is selected and memorized, and then directly enter the brightness state after turning on the flashlight again.
1. The stepless dimming lamp dims smoothly within the dimming range, and there is no layering like a gear. Stepless dimming adopts a unique digital stepless dimming system technology, and users can set their own brightness simply by rotating the lamp holder. The brightness transition is smooth, and there is no preset brightness limit.
2. Users can choose appropriate brightness output according to different environmental requirements, or set very low brightness to realize long-term continuous use. Half-pressing the switch lights up? Flashlight, release the button. The flashlight went out.
If you need to light the flashlight continuously, you can press all the switches until you hear a beep, and then let go. The flashlight will continue to illuminate until you press the switch again. It has two working modes: tactical mode and custom brightness.
3. When the flashlight head rotates clockwise, the flashlight is in tactical mode. In tactical mode, the user can make the flashlight work at full power output or perform flashing function. A little loose? Turn on the light a little, and the flashlight will enter the custom brightness mode. In this mode, the user can set the brightness of the flashlight by himself.
Extended data
Application of stepless dimming lamp
First, LED lighting stepless dimming
1, analog DC dimming
Analog DC dimming generally controls the output DC current by changing the reference of the steady current control loop of LED driver through analog level signals, thus effectively controlling the brightness of LED lamps. This dimming control method is simple to realize, and it does not need to change the main circuit structure of the original constant current driver. The driver has low cost and high efficiency.
The LED is driven by a constant current source, so the current is reduced, the on-voltage of the LED is also reduced, and the luminous efficiency is high. At present, this brightness control method has been applied to stepless dimming control of LED lighting in some roads and tunnels.
Because the 0- 10V dimmer power supply is connected with 220V alternating current, the 0- 10V dimmer will be manually contacted, so electrical isolation is needed. Therefore, it is necessary to place a 0- 10V voltage isolation module in the 0- 10V dimming power supply, and PWM signal is a commonly used isolation technology, which can realize isolation and give consideration to analog information transmission.
Traditionally, the common methods used to realize the detection of analog signals and the isolated output of PWM signals are often realized by circuits composed of operational amplifiers, MCU and discrete devices, which often require more than 30 components. The system is very complicated, and its accuracy and reliability are usually poor.
Therefore, at present, this kind of application is often replaced by single chip scheme. It solves many problems of traditional analog signal to PWM scheme, with high precision, adjustable speed, no need to write programs, and the system is stable and reliable.
2.PWM dimming (secondary side adopts PWM control to control the effective value of output current)
This control method is generally based on the DC constant voltage power supply, plus a constant current DC/DC converter (or PWM chopper switch at the output end of the constant current power supply) to control the working time of the constant current DC/DC converter (or PWM chopper switch) in a unit cycle, and the chopping frequency is several hundred Hz to 1KHz.
So as to obtain square wave output currents with different duty ratios, and adjust the duty ratio of the square wave output current, that is, adjust the average value of the output current, thereby changing the brightness of the LED lamp. Using PWM mode dimming, when the chopping frequency is above several hundred Hz, human eyes will not feel flicker or jitter.
One advantage of LED PWM dimming is that the light color of the light source does not change with the current. This control method adds a DC/DC converter (or PWM chopper switch) to the original constant voltage source, which increases the cost of the circuit and the loss of the main circuit.
Under the same average current, the luminous efficiency of LED light source under PWM square wave current is lower than that under DC current, so the energy-saving effect of PWM dimming method is not as good as that of analog dimming method.
3. Current-limiting mode dimming
Current limiting dimming is to connect LED lamp and transistor in series in the module output of DC constant voltage source. As a variable current limiting resistor, the transistor works in the amplification region, and the led current is effectively controlled by changing the resistance of the variable resistor, thus controlling the brightness of the LED lamp.
In this dimming mode, the voltage and current borne by the transistor are wasted in the form of heat, and the LED driving efficiency is low. This control method is only suitable for brightness control of low power LED.
Second, continuous dimming of electrodeless lamps.
Electrodeless lamp, also called electromagnetic induction lamp, consists of ballast, coupler and bulb. Due to different working frequencies, it can be divided into high-frequency electrodeless lamps and low-frequency electrodeless lamps. High-frequency electrodeless lamp mainly adopts bubble coupling mode, and its working frequency is 2.65MHz. Low-frequency electrodeless lamp mainly adopts tubular and annular coupling mode, and its working frequency is 250KHz.
The electrodeless lamp is roughly composed of three parts in structure, namely, high-frequency electronic ballast, power coupler (internal coupling, 2.65MHZ) and glass bulb coated with rare earth phosphor (which can be in various shapes, such as spherical and square).
Under the action of commercial power (50HZ), the ballast simultaneously generates a high-frequency sinusoidal voltage of 2.65MHz and an ignition voltage of about 3000V, and a high-frequency magnetic field is instantly established in the glass shell coated with rare earth phosphor through a power coupler.
At the same time, the high-frequency magnetic field produces a high-frequency alternating electric field, which leads to the ionization of inert gas (mixed gas of krypton and argon) inside the bubble shell, which further produces avalanche effect (which should be the chapter of college physics, Zener breakdown and avalanche breakdown) and produces a lot of ultraviolet radiation. Phosphors produce visible light under the action of ultraviolet light.
The working voltage of electrodeless lamp works normally in the range of 85V-275V AC, and the DC can be customized and dimmable. Because of the use of electronic ballast, the AC, DC and voltage range is very wide, and continuous dimming can be realized. This is impossible for metal halide lamps.
Baidu encyclopedia-stepless dimming