Impedance matching: the most common is the electronic circuit, the output and input connection, in order to signal unobstructed, usually using the transformer impedance matching, such as the old-fashioned broadcast, because it is using constant pressure output, speakers are high impedance horn , So it can only match with the output transformer. So, daily life can not be separated from the transformer, industrial production is also inseparable from the transformer.
First talk about the buck, usually we use a variety of voltage, such as life lighting is 220V, industrial safety lighting is 36V, welding machine voltage also need to be adjusted, which are inseparable from the transformer, the transformer through the main and auxiliary coil electromagnetic Mutual inductance principle, can reduce the voltage to the voltage we need. In the process of long-distance voltage transmission, we need to raise the voltage to a high, in order to reduce the voltage loss, usually rising to several thousand volts or even tens of kilovolts, which is the role of the transformer.
Transformer role is generally there are two, one is the role of step-down, the other is the impedance matching effect.
