Now, there are several leds. What principles do they use

Answer:

The rear edge controls the dimmer, which is made of FET or insulated gate bipolar transistor (IGBT). The MOSFET is normally used as a switch device by the cutting phase dimmer, so it is also called MOSFET dimmer, commonly known as "MOS tube". MOSFET is an all-control switch that can be controlled or controlled, so there is no such thing as a completely controlled switch. Other MOSFET dimmer than the silicon controlled rectifier circuit is more suitable for capacitive load dimmer, but because the cost is high and the dimming circuit is relatively complex, stability and other characteristics, it is not easy to do the MOS tube dimming is not developed, silicon controlled dimmer still occupied most of the adjustable optical-intensity system market.

DALI (digital addressable lighting interface) 5, DMX512 (or DMX) 1, edge cutting phase control dimming The forward dimming is the use of the silicon controlled circuit, starting from the ac phase 0, the input voltage chopper, until the thyristor is controlled, the voltage input is available. The principle is to adjust the waveform of each half wave of alternating current, to change the effective value of alternating current, to realize the purpose of adjusting the light. Frontier dimming equipment has a high controlling accuracy, high efficiency, small volume, light weight, easy to remote operation advantages, such as dominant in the market, most of the manufacturers of products is this type of dimmer. The forward phase control dimmer is generally used as a switch device, so it is also called a thyristor dimmer

LED lighting is different from traditional lighting, which relies on a p-n junction, and a power LED light source, because of its adoption Chip is different, current voltage parameter is different, so the internal structure and circuit wiring distribution is different also, LED to the switch manufacturer of light source light also have different requirements, so the control system and light electrical mismatch has become the common fault of the industry, also for the diversification of LED control system are also put forward higher challenge. If the control system does not match the lighting equipment, it may cause the lights to go out or shine, and may cause damage to LED drivers and light sources. There are five types of LED lighting in the market: 1, cutting phase (FPC), thyristor dimming 2, and then the cutting phase (RPC) MOS tube, 3, 1-10vdc

1-10 v dimming device has two independent circuit, for a common voltage circuit, used to switch on or off to the power of the lighting equipment, the other one is low voltage circuit, which provides a reference voltage, tell lighting dimming level, 0 to 10 v dimming controller used for fluorescent lamp dimming control on before, now, because on the LED driver module and the constant power supply, and have a special control circuit, so the 0 to 10 v dimmer can also support a large number of LED light. But the disadvantages are also obvious, and the low voltage control signal requires an extra set of lines, which greatly improves the construction requirements.

The advantage of using FPC dimmers on LED lighting is that it is low cost, compatible with existing lines and no need to rewire. The disadvantage is that the performance of the FPC is poor, usually resulting in a reduction in the range of dimming, and the minimum required load is more than a single or small LED lighting rating. Because thyristor switch attributes, only open the function of the current, but can't completely shut off the current, even to the lowest still have weak current flow, the characteristics of micro electric current and the LED luminous with silicon controlled dimmer abound shut final LED chemiluminescence phenomenon still exist, become the current wiring LED dimming way free promotion. E - would easily cut the forefront of professional development phase LED turn light very good solve the problem, through the drive circuit of "C - TURNOFF" technology optimization to avoid "off" and "bad light stroboscopic" problem. Matching E - would easily cut phase before LED turn light of all kinds of lamps and lanterns can perfect match with other silicon controlled dimmer system, for the user to save the wire and the wiring work, solve the SCR LED dimming fit and do not shut off the chaos of the landscape.