An isolation transformer is a special type of transformer whose main function is to provide electrical isolation so that the circuits between the input and output are isolated from each other, thereby preventing current from flowing through the circuit connecting them. Isolation transformers are usually used in the following areas:
1. Electrical isolation: The main function of an isolation transformer is to create electrical isolation between input and output, preventing current, noise and interference from propagating from one circuit to another. This is critical to protecting equipment and personnel.
2. Earth wire isolation: Isolation transformers can be used to isolate ground wires to prevent earth wire interference between different devices, thereby reducing the spread of noise and interference.
3. Voltage conversion: Although the main purpose of an isolation transformer is to provide isolation, it can also be used to convert an input voltage to a different output voltage, although this is usually not its primary purpose. The working principle of an isolation transformer is similar to that of an ordinary transformer, but its design pays more attention to electrical isolation. It consists of two main coils: primary coil (input coil) and secondary coil (output coil). There is no direct electrical connection between the two coils, they are coupled to each other through a magnetic field.
The working principle is as follows:
1. Electromagnetic induction: When AC current is passed into the main coil, it will generate an alternating magnetic field. This magnetic field penetrates into the secondary coil, inducing an alternating voltage in the secondary coil.
2. Transformer principle: According to the basic principle of a transformer, the ratio between the output voltage and the input voltage depends on the division ratio of the primary coil and the secondary coil. In isolation transformers, they are usually designed with equal turns ratios, so the output voltage is the same as the input voltage.
3. Electrical isolation: Since there is no electrical connection between the main coil and the secondary coil, the input and output circuits are isolated, thereby achieving electrical isolation.
