Tipus de variador

Dimmers can be classified according to control mode and application occasion. According to the control mode, it can be divided into resistance dimmer, voltage dimmer, magnetic amplification reactance dimmer and electronic dimmer; According to the application occasion, it is divided into civil dimmer, film and television stage dimmer, airport light dimmer and daytime integrated control system.

The resistance dimmer connects the resistance in series between the incandescent light source and the power supply. Changing the resistance value can adjust the current in the light source to achieve the purpose of dimming. Its disadvantages are high energy consumption, low efficiency, large volume and inconvenient control. Its advantages are that both AC and DC power supplies can be used without radio interference. It can be used in laboratory, audio-visual demonstration and lighting of ship navigation equipment.

A voltage dimmer is an autotransformer. The secondary voltage is changed by adjusting the contact position between the brush and the coil wound outside the transformer yoke. It has the advantages of less energy consumption, high efficiency, increasing the load within the rated power without affecting the original dimming degree. The disadvantage is that it is only suitable for AC power supply, bulky, non-ferrous and ferrous metals with more consumption, and can not be controlled remotely.

The magnetic amplification reactance dimmer changes the inductive reactance of the AC winding by changing the current in the DC winding wound on the iron yoke. It has good dimming performance and convenient control, but it is bulky and bulky. It has been replaced by electronic dimmer.

Electronic dimmer used thyristor as switching element in the early stage, and then thyristor element. The dimmer has the advantages of light weight, small volume, high efficiency, easy remote control and so on. Its disadvantage is that if effective filtering measures are not taken, radio interference will be generated, and dimming is troublesome for gas discharge light sources such as fluorescent lamps and high-intensity gas discharge lamps. This disadvantage can be overcome by using high-power transistor or field effect transistor dimmer.

Civil dimmers are used in homes, offices, meeting rooms, schools, corridors and other occasions. Simple circuit, low price and low performance requirements. Common dimmers, such as those installed on table lamps and chandeliers, can meet people's needs for light in different work, so as to achieve the purpose of comfort, hygiene and energy saving.

There are two kinds of dimmers for film and television stage: single circuit and multi circuit, and the capacity of each circuit is large. Multi loop, large capacity, also known as dimming device, which is characterized by multiple circuits, complete functions and consistent dimming performance of each circuit. There are two control methods: manual control and microcomputer control. Manual control methods include automatic control, centralized control, cross control, sub general control, general control and field preselection; In addition to all the above functions, the microcomputer controlled can also store the light and dark information of each stage lamp in the microcomputer according to the different times and the order of time, and automatically execute the program according to the times. According to the special requirements of film and television stage for lighting, new varieties such as voice controlled and program controlled dimmers have emerged.

The utility model relates to an airport light dimmer, which is a device for adjusting the brightness of high light intensity airport lights and lighting systems on the airport. Under various meteorological conditions, the airport lights shall be able to guide the take-off and landing of aircraft, and the dimmer must meet the adjustment requirements of brightness level specified in the Convention on international civil aviation. The complete lighting system of the airport is installed in a large range and has a long transmission distance. It is required that the level brightness should not be affected by the power supply voltage, the load (including the burning of individual light sources) and the length of the line, and can be controlled centrally on the tower. Therefore, the airport light dimmer is a constant current dimmer with adjustable current output high voltage. Each light source is connected to the secondary of its isolation transformer, and then the primary is connected in series to the high-voltage output end of the dimmer, and the output current of the output end is adjusted to achieve the purpose of dimming.

Daylight integrated control system is an automatic dimming system with microcomputer system. It is used for centralized control of many lights in buildings or similar places, which are synchronized with daylight and intensity, and related to indoor working time schedules, so as to achieve the purpose of no operation and energy saving. It uses photoelectric control, time program and computer technology to control the indoor illumination at the required level. The system includes daylight dimming, time program control dimming and alarm control dimming. Most of the load of dimmers are incandescent lamps, and a few are fluorescent lamps.