Coil indirect coupling refers to a method of transferring energy or information between two separate coils without having them physically connected. It is achieved through the phenomenon of electromagnetic induction. Electromagnetic induction is the process where a changing magnetic field induces an electric current in a nearby conductor. When a varying current flows through the first coil (known as the primary coil), it creates a changing magnetic field around it. This changing magnetic field then induces an electric current in the second coil (known as the secondary coil) placed in proximity to the primary coil. The level of coupling between the two coils can be adjusted by varying the distance between them and by using appropriate coil designs. If the coils are placed close to each other and have a high degree of mutual inductance, a significant amount of energy or information can be transferred from the primary to the secondary coil. Coil indirect coupling is widely used in various applications. Some examples include:
Wireless power transfer: It is used in wireless charging systems to transfer electrical energy from a power source (primary coil) to a device (secondary coil) without the need for physical connectors.
Inductive communication: It can be employed in systems where information or data is transmitted wirelessly between two devices using electromagnetic induction. This is commonly seen in applications like RFID (Radio Frequency Identification) and wireless sensor networks.
Transformers: Transformers use coil indirect coupling to step up or step down voltages in electrical power distribution systems. The primary and secondary coils are placed on separate windings of a shared magnetic core, allowing efficient energy transfer between them.
In summary, coil indirect coupling is a technique that enables energy or information transfer between two coils without direct electrical connection. It relies on the principle of electromagnetic induction and finds applications in wireless power transfer, inductive communication, and transformers.
