In our daily lives we can not live without a variety of household appliances, but we do not know almost all of the appliances need a transformer, but we do not understand the transformer, which plays a role in appliances, what function, we are not clear, in this paper, we learn the principle of the knowledge of the toroidal transformer to understand the principle of the transformer to take you into a field you do not understand, in this unknown field to appreciate the crystallization of the wisdom of scientists. In this article, we learn the knowledge of the principle of the toroidal transformer, understand the principle of the transformer, take you into a field you do not know, in this unknown field to appreciate the wisdom of scientists.
The core of the toroidal transformer is made of high-quality cold-rolled silicon steel sheet (sheet thickness is generally 0.35mm or less), seamlessly rolled, which makes its core performance superior to that of the traditional laminated core. Toroidal transformer coils are evenly wound on the core, the direction of the magnetic lines of force generated by the coils and the core magnetic circuit is almost completely coincident, compared with the laminated type of excitation energy and core loss will be reduced by 25%. Toroidal iron core is wound by silicon steel tape, toroidal iron core has a continuous magnetic circuit, while the laminated iron core transformer in the EI piece between the air gap; therefore, the existence of a larger air gap magnetoresistance is the main disadvantage of the laminated transformer. The toroidal core has no air gap, and the electrical noise is much smaller relative to EI and C-type core transformers. The use of vacuum impregnation technology, can make the core become a solid whole, in the winding and processing process is not deformed; due to the ring-type core is very strong, thus reducing the vibration and audio noise.
There are many fixing methods for toroidal transformers, the most common method is to use the center hole of the toroidal transformer to fix. It should be noted that fixings such as screws should not ground the top platen of the transformer at the same time as the lower base plate to avoid forming a short-circuiting ring.
The principle of a transformer is the transformer? The principle of the simplified diagram of the device, when a positive? sinusoidal AC? voltage U1? is added to the primary? coil ends, there is an alternating current I1 in the wire and produces an alternating magnetic flux ф1, which travels along the core? through the primary and secondary coils to form a closed magnetic circuit. In the secondary coil? Mutually induced potential U2 is induced in the secondary coil, while ф1 is also induced in the primary coil. will induct a self-induced potential E in the primary coil. Should be a self-induced potential E1, E1 direction? direction is opposite to the applied voltage U1 and similar in magnitude, thus limiting the magnitude of I1. In order to maintain the existence of magnetic flux ф1 need? A certain amount of electrical power is required. Energy consumption, and the transformer itself has a certain loss, although the secondary is not connected to the load, there is still a certain current in the primary coil, the current we call "no-load current".
If the secondary connected to the load, the secondary coil produces current I2, and therefore produce magnetic flux ф2, ф2 direction and ф1 opposite, played the role of mutual offset, so that the total magnetic flux in the iron core has been reduced, so that the primary self-induced voltage reduction of E1, and as a result of the increase in I1, see the primary current and the secondary load has a close relationship. When the secondary load current increases I1 increase, ф1 also increased, and ф1 increased part of the flux offset by ф2 just supplemented that part of the flux to keep the total magnetic flux in the core unchanged. If transformer losses are not taken into account, the power consumed by the secondary load of an ideal transformer can be considered to be the same as the primary power obtained from the power supply.
The transformer can change the secondary voltage by changing the number of turns in the secondary coil as required, but it cannot change the power allowed to be consumed by the load. All this knowledge is what we did not know before, through a simple study to understand the working principle of the toroidal transformer knowledge, can be on our daily life to deal with some of the electrical glitches as well as daily life in the different transformers in the different uses are of great significance. Can be timely troubleshooting problems, quickly find a solution, mom no longer need to worry about I will not be simple maintenance.
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