Design Method of Equal Radius Electromagnetic Resonance Parallel Power Supply Coils

Abstract

The invention discloses a method for designing an equal-radius electromagnetic resonance parallel power supplying coil. For aiming at a problem of low transmission efficiency of a system at a resonance frequency caused by frequency splitting in an over-coupling state of the system because of rapid mutual inductance increase between a receiving coil and a transmitting coil in short-distance transmission of a magnetic coupling resonance type wireless charging system with the receiving coil and the transmitting coil with the equal radius, a reversing coil with flowing current direction which is opposite from that of an original transmitting coil is parallelly connected with a transmitting end coil, thereby weakening mutual inductance between the transmitting end coil and a receiving end coil in short-distance transmission, weakening over-coupling degree, inhibiting frequency splitting, and improving transmission efficiency of the system at the resonance frequency.

Description

technical field [0001] The invention belongs to the technical field of wireless energy transmission equipment, and in particular relates to a design method for equal-radius electromagnetic resonance parallel power supply coils. Background technique [0002] Electric energy has become an indispensable source of energy in people's lives, and its main transmission method is realized by wires. So far, the status of this transmission method is still irreplaceable. With the rapid development of science and technology, electronic products are becoming more and more miniaturized and portable, making the defects of traditional power transmission methods more and more obvious, such as power supply wires occupying a large space resource; Interference; in special environments (such as explosion-proof, fire prevention, underwater, industrial and mining fields), electric sparks at wire connections may cause major safety accidents; the existence of charging wires makes portable electronic ...

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Problems solved by technology

However, this technology has not been widely used so far. The main reason is that it is restricted by the output power and transmission efficiency. For the optimization research of the two, most of the research at home and abroad is mainly focused on the typical WPT system. The method is mainly By changing coil parameters (such as material, quality factor, shape, etc.), high-frequency inverter circuit topology, adding auxiliary circuits (frequency tracking circuit, tuning circuit, etc.), there are few studies on the influence of coil transmission structure on system performance.

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