What is the difference between the cutting phase and the rear edge of the LED?
Led fluorescent lamp power front, rear edge adjustment light difference The led fluorescent light source is equipped with the thyristor circuit, and the led fluorescent lamp is equipped with a triode circuit along the modulation light, and the dimmer is used to cut the input voltage waveform. In fact, the front end is beheaded in the front, which is when the ac phase 0 starts, the input voltage is chopper, and the voltage input is only when the thyristor is controlled. The rear edge is similar to the light, which starts off in one phase and starts at 180 degrees. The led fluorescent lamp power supply leading edge 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 manufacturer's products are of this type dimmer. The forward phase control dimmer is generally used as a switch device, so it is also called a thyristor dimmer. At present many manufacturers have adopted is thyristor dimmer way, namely USES the forward conduction, by passing zero natural off dimmer, the way of that move light have two defects:
The high frequency of A and the power grid interferes with the pollution and is produced in the instant of the conductance. It can interfere with electrical appliances in the home, and interfere with the whole grid. B, noise, internal restraining inductance that makes low-frequency noise at the instant of the opening, must be processed by sound insulation.
The advantage is that the power is controlled, the technology is mature and the cost is low. In order to save costs, some manufacturers remove the inhibiting inductance, which is undesirable and greatly increases interference in peripheral devices. When it's serious, the imaging device won't work. Led fluorescent lamp power source is followed by the light: after zero conductance, then the technology of MOS/IGBT, which is shut off, solves the problem of grid interference and noise. The soft start and soft closing technology adopted by the dimmer actuator avoids the thermal shock of the filament, which can further prolong the life of the lamp.
