The switch is divided between current and voltage
The voltage regulator is a self-coupling transformer. The second voltage is changed by adjusting the contact position of the coil that is wrapped around the iron yoke of the transformer. It has the advantages of low energy consumption, high efficiency, and increased load at the rated power. The drawback is that it only applies to ac power, heavy, heavy consumption of colored and black metal, and cannot be controlled remotely.
The early adopters of electronic dimmers were turned on by the thyristor, which was later adopted by the thyristor. This kind of dimming device has the advantages of light weight, small volume, high efficiency and easy remote control. It is widely used. Laid the foundation modern dimmer switch to, its disadvantage is that if we do not take effective measures, the filter will produce radio interference, and the gas discharge light source such as fluorescent lamp, high intensity discharge lamp, such as light changes difficult to achieve. The dimmer of a large power transistor or field effect tube can overcome this defect.
The magnetoelectric shock dimmer changes the impedance of the ac winding by changing the size of the current in the dc winding of the yoke. It has good dimming performance and easy to control, but bulky and bulky, has been replaced by electronic dimmer
Briefly introduce you to several early dimmers. Resistance dimmer (current) resistance will be concatenated in the middle of the incandescent light source and power supply, the change of resistance can adjust the light source current, the purpose of dimmer. Its drawback is that it is energy-intensive, inefficient, bulky and inconvenienced, and the advantage is that it can be used without radio interference. It can be used in the lighting of laboratory, teaching demonstration and Marine navigation equipment.
