The Introduction Of Dimmer Switch.A Warm Haven From Dimmers

The dimmer can cause wonderful lighting effects, the space and the light collide, this is the "magic" of the dimmer! With it, feel free to imagine and create! The commonly used thyristor dimmer is composed of a main loop, a trigger loop, a control loop and a feedback system, and is suitable for dimming of thermal radiation light sources.

Light modulator

The dimmer consists of the following parts:

main circuit

It is composed of bidirectional or unidirectional anti-parallel thyristors connected in series in the light source circuit. After the input is an AC sine wave, the output through the thyristor is a sine wave with a missing angle and a phase shift. It can be seen from Figure 2 that the waveform must contain high-order harmonics, which will cause radio interference; secondly, the effective value of its output voltage has a nonlinear relationship with the conduction angle.

Light modulator

Trigger loops include relaxation oscillators composed of discrete semiconductor components and monolithic integrated triggers composed of trigger diodes. It must generate the trigger pulse required to synchronize with the phase-shift conduction angle of the input voltage in each cycle, and has a certain trigger power to achieve the purpose of reliable triggering.

Control loop

In addition to the commonly used manual control, there are also various control trigger loops such as photoelectric control, audio control, program control and feedback control.

feedback system

In order to achieve constant voltage, constant current, short-circuit protection and other purposes, closed-loop protection measures are adopted to form a feedback system to meet different quality requirements.