Research Of Power Supply Based On Magnetic Coupling Wireless Transmission

In the power system, the current transformer is an important part,measurement and protection is its main application, it can space from the primaryequipment and secondary equipment, and convert the primary side of the currentinto small current, thus the system current can be measured and protected. Inrecent years, the power industry in our country developed rapided, anddigitization becomes its development direction, the concept of smart grid hasbeen proposed, and therefore traditional current transformers can no longer meetthe needs, so there is a new type of electronic current transformer (ECT), andbecame the focus of national research quickly. But in the research of ectroniccurrent transformers, the power supply of high-voltage side is an important task,but also a technical problem. Although there are several generally received powersupply scheme, but each program has its own drawbacks, so researchers havebeen looking for a new way to solve this dilemma.Because the voltage levels of electronic current transformers35kV, thesupport insulators is common type,the bending strength is6, insulator length is0.42m, so we must transmite electrical energy from the low potential side to thehigh-pressure side at least0.42m distant, In order to solve this problem of thepower supply method, we use magnetic coupling technology to solve thisproblem, realize the power supply of circuit board of the high-pressure side withthe method of the wireless power transmission. This program is safe and reliable,simple structure will have broad prospects for development.This paper introduce the method of electronic current transformer powersupply, Proposed the supply of high-voltage current transformer by the wirelessenergy transmission, The entire apparatus including a transmitting device and areceiving apparatus, the emission part produce square wave by use CPLD todrive the full-bridge inverter circuit, generates high frequency excitation maketransmitting and receiving coil resonance occurs at the same time, realize the energy transmission. By adjusting system parameters, a number of experimentaldata comparison and analysis the magnetic coupling wireless energy transfermechanism in-depth, and prove that is feasible. Finally, receive voltage stable at12V successfully, power is5W, transmission distance is0.5m.