An inductive power transfer system with constant current and constant voltage seamless switching

Abstract

The invention provides an induction power transmission system with constant current and constant voltage seamless switching, which comprises a three-arm inverter and a magnetic coupling structure. Thethree-arm inverter comprises three arms, two switch tubes are arranged on each arm, and the input terminal of the three-arm inverter is connected with a DC power supply. The magnetic coupling structure comprises a transmitting end connected with the output end of the three-arm inverter and a receiving end connected with the load. Wherein the transmitting end is formed by two coils in series, twoterminal points of the two coils and a node between the two coils are respectively connected with a node between two switch tubes of one of the bridge arms; The receiving end is a single coil; The switching between constant current output characteristics and constant voltage output characteristics is realized by controlling the on-off of the switch tubes of different three-arm inverters. By adopting the combination of the three-arm inverter and the magnetic coupling structure, the invention realizes the seamless switching from the constant current to the constant voltage by using the switchingmode of the working bridge arm, thereby ensuring the system stability.

Description

technical field [0001] The invention relates to the technical field of inverters, in particular to an inductive electric energy transmission system for seamless switching of constant current and constant voltage. Background technique [0002] The Inductive Power Transfer (IPT) system is based on the principle of electromagnetic induction to realize the wireless transmission of electric energy. This technology has the advantages of being safe, reliable, and not easily affected by the environment. It can effectively solve the problems of wired charging wire wear, line aging, poor contact, and potential safety hazards caused by contact with sparks. [0003] In the IPT system, due to the large gap between the transmitting end and the receiving end of the magnetic coupling structure, the leakage inductance between the two is large, resulting in a low coupling coefficient, which in turn affects the transmission efficiency of the entire system. In order to improve the active power...

AI Technical Summary

Problems solved by technology

[0005] To realize the constant current or constant voltage output characteristics of the IPT system, the usual method is to add a DC / DC converter after the resonant compensation network at the receiving end, but this increases the weight of the receiving end and the loss of the system; or by switching the resonant compensation topology, but the control Part of it is complicated, and it also increases the system cost; or changes the system resonant frequency, but frequency bifurcation may occur, resulting in system instability

Images