How Isolation Transformers Work

How Isolation Transformers Work
What is the working principle of the isolation transformer? The working principle of the isolation transformer is the same as that of the ordinary transformer. All of them use the principle of electromagnetic induction. The following is a detailed introduction for the customer, hoping to help you.

Isolation transformers are not all 1:1 transformers. Power supplies for controlling transformers and tube equipment are also isolation transformers. Power supplies such as tube amplifiers, tube radios, and oscilloscopes and lathe control transformers are isolation transformers. For example, a 1 to 1 isolation transformer is commonly used for the maintenance of color TVs. Isolation transformers are used more often and are also used in air conditioners.

Although there is an isolation circuit between the primary and secondary windings of the transformer, the capacitance between the two windings can still cause static interference between the two circuits at high frequencies. To avoid this interference, the primary and secondary windings of the isolation transformer are generally placed on different stems to reduce the capacitance between the two; the primary and secondary windings are also placed concentrically but are added between the windings. Electrostatic shielding for high anti-interference properties.

Electrostatic shielding is to set a piece of non-closed copper or non-magnetic conductive paper between the original and secondary windings, which is called shielding layer. Copper or non-magnetic conductive paper is connected to the housing with wires. Sometimes, in order to obtain better shielding effect, a shielded enclosure is also covered in the entire transformer. The winding lead terminals are also shielded to prevent other external electromagnetic interference. In this way, the primary and secondary windings can only have magnetic coupling, and the equivalent capacitance between them can be less than 0.01 pF, which greatly reduces the capacitance current between the primary and secondary windings, effectively suppressing the power supply and other circuits. Various kinds of interference.