Water purifier transformerAs we all know, the function of power transformers is to help transmit power, voltage conversion and insulation isolation, so they have been widely used in power technology and power electronics technology.
The basic type of power transformer is composed of two sets of coils with wires, which are inductively combined with each other. When an alternating current (with a known frequency) flows through one coil, an alternating voltage with the same frequency will be induced in the other coil. The magnitude of the induced voltage depends on the degree of coupling between the two coils and the magnetic steel.
Usually, the coil connected to the AC power supply is called the primary coil. The voltage across the coil is called the primary voltage. The induced voltage in the secondary coil may be greater than or less than the primary voltage, which is determined by the turns ratio between the primary coil and the secondary coil. Therefore, power transformers are divided into step-up and step-down transformers. Most power transformers have a fixed iron core with primary and secondary coils wound around it. Due to the high permeability of the ferrous material, most of the magnetic flux is confined in the iron core. Therefore, a relatively high degree of magnetic coupling can be obtained for the two sets of coils.
In some transformers, the coil and the core are closely combined, and the ratio of the primary voltage to the secondary voltage is almost the same as the turn ratio of the two coils. Therefore, the transformer turns ratio can usually be used as a reference index for transformer step-up or step-down. Because of this step-up and step-down function, the transformer has become an important accessory of modern power systems. Increasing the transmission voltage makes long-distance transmission more economical. For step-down transformers, it makes the use of power more diversified. It can be said that if there is no transformer, the industry will not be able to reach the current state of development.
Transformers are commonly used in various electronic devices. The reasons are: to provide various voltage levels to ensure the normal operation of the system; to provide electrical isolation for components operating at different potentials in the system; to provide high impedance for AC current and low impedance for DC; and to maintain or modify the waveform and frequency response at different potentials. In addition to the small size of the power transformer, there is no clear dividing line between the power transformer and the electronic transformer. Generally, the power supply that provides a 60Hz power network is very large and may have a large capacity to cover half a continent. The power limit of electronic equipment is usually limited by the ability of the system rectification, amplification and other components, some of which are amplifying power, but if compared with the power generation capacity of the power system, it still belongs to the range of small power.
Therefore, according to the size of the transmission power, the power transformer can be divided into the following levels: high power: more than 10kVA; medium power: 10kVA ~ 0.5kVA; low power: 0.5kVA ~ 25VA; micro power consumption: less than 25VA. The transmission power is different, and the design of the power transformer is also different, which is self-evident.