With the development of science and technology, more and more things can be done on mobile phones, ranging from a dimming system to a small lamp. In a space that needs dimming, the designer needs to know which lightsource can be convenient dimming, and which dimming methods are available, so as to give a better plan.
One, cutting edge phase control dimming
Leading edge dimming is the use of SCR circuit, from the ac phase 0, the input voltage chopper, until the SCR conduction, there is no voltage input. That is to use the leading edge conduction, through the zero point of the way to switch off the natural dimming.
LED fluorescent lamp power front dimmer has the advantages of high adjustment accuracy, high efficiency, small size, light weight, easy remote control, etc., in the market dominant position, most manufacturers' products are this type of dimmer. However, the front cut dimmer is prone to greater noise, in the occasion of high requirements is not recommended to use this dimmer.
Second, the back edge of the tangent phase control dimming
The back edge dimming of LED fluorescent lamp adopts triode circuit. The dimmer choppers the input voltage waveform. Start off with a phase and start on at 180 degrees.
LED fluorescent lamp power back edge dimming: MOS/IGBT technology with zero crossing on and off back edge solves the problem of power grid interference and noise.
Compared with the front tangential control dimming mode, the rear tangential control dimming compatibility is better, but the internal circuit structure is more complex, the cost of control is relatively high.
Three, 1-10v dimming
The principle of 1-10v dimming mode can be shown in the figure below. The relation between the x-coordinate control voltage and the y-coordinate light flux on the right is as follows: when the control voltage is 1V, the light flux is at least about 1%; when the control voltage is 10V, the light flux is at most 100%. In the process of dimming, the two show a linear relationship.
For example, there are many lights in a room. We set a set of 1-10v control lines less than 50 meters for each light and connect them to the controller. When the controller is adjusted, the voltage on the control line changes and the light is turned on or off.
The disadvantage of 1-10v dimming is that multiple groups of lamps on a control panel can only change at the same time. If you want to achieve different control for each lamp, you can only make the control panel correspond to the lamps one by one. When the number of lamps increases, it will obviously become very troublesome to operate.
Iv. DALI dimming
When multiple lamps need dimming, we can use DALI dimming to replace the 1-10v dimming mode. DALI dimming is a typical digital control mode.
DALI(Digital Addressable Lighting Interface) is an internationally public specification Lighting control communication protocol with a communication speed of 1200 BPS 10%. It is mainly used for dimming control of multiple fluorescent lamps and LED lighting. DALI can form a network with a maximum of 64 short addresses and 16 groups of addresses. A host can control one or more slave machines and communicate in a half-duplex mode.
DALI means each of the four letters:
DALI can dimming every lamp with DALI driver. Different lighting units on the DALI bus can be grouped flexibly to realize different scene control and management. Compared with other dimming methods, DALI has the following advantages:
1, digital dimming, dimming accurate stable smooth;
2. DALI can communicate in both directions and feedback the situation of lamps to the system;
3. DALI control is more flexible;
4. DALI has strong anti-interference ability.
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