Permanent magnet bias inductor tuning device and method with parallel magnetic circuits

Abstract

The invention discloses a permanent magnet bias inductance tuning device with parallel magnetic circuits. The device comprises a left magnetic core, a right magnetic core, a permanent magnet, an air gap, an inductance tuning coil and a direct current control coil, wherein the left magnetic core and the right magnetic core are arranged side by side, the permanent magnet and the air gap are arranged between the left magnetic core and the right magnetic core, the permanent magnet forms a closed inner side magnetic circuit in inner side arms of the left magnetic core and the right magnetic core according to the excitation direction, and the direct current control coil is formed by connecting two windings on outer side arms of the left magnetic core and the right magnetic core in series. The magnetomotive force of the direct current control coil forms a closed outer magnetic circuit in the left magnetic core and the right magnetic core, and the inductance tuning coils are arranged on the inner side arms of the left magnetic core and the right magnetic core. The excitation current of the direct current control coil required for adjusting the state of the magnetic core when the device works is reduced, the direct current control power and the loss caused by the direct current control power are effectively reduced, meanwhile, the influence of a load on the work of the inductance tuning device is reduced, and the working stability of the inductance tuning device is improved.

Description

technical field [0001] The invention relates to the technical field of inductance tuning devices, in particular to a permanent magnet bias inductance tuning device and method with a parallel magnetic circuit. Background technique [0002] With the development of power electronics technology, high-frequency resonant converters have been widely used in various industrial occasions, such as wireless charging (energy transmission) devices, plasma generators, bidirectional DC / DC power supplies, power electronic transformers, etc. Resonant converters generally require the operating frequency to be in a resonant or quasi-resonant state, that is, the operating frequency is equal to or close to the resonant frequency of the converter. If this condition cannot be met, the energy transmission efficiency will drop sharply. However, it is difficult to ensure that the resonant inductance and capacitance of the resonant converter are completely consistent during mass production, and long-t...

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Problems solved by technology

However, through the analysis of the characteristics of the magnetization curve, it can be seen that the magnetic permeability of the area adjacent to the saturation region of the magnetization curve does not change significantly. To adjust the magnetic flux density of the magnetic core around this working point requires a large DC control current, which cannot be realized for the DC control coil. efficient use of

At the same time, the magnetic flux density of the middle magnetic core cannot be adjusted by using double E-shaped magnetic cores, and there is a certain degree of material waste

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