Wireless power transmission system adaptive to multi-load dynamic switching

Abstract

A wireless power transmission system adapted for multiload dynamic switching comprises a primary module for transmitting electric energy and a second module for picking up electric energy. The primary module transmits electric energy to the secondary module by using electromagnetic coupling resonance, and when the secondary module switches different power loads, the secondary module gradually changes, by using soft switching, a secondary reflected impedance by using a mode of gradually increasing voltages on two sides of a load, so that changes of a resonance frequency and a phase of the primary module are kept in a self-adaptive range of frequency tracking and control. The primary module can make stable adjustment according a dynamic change of the load, making the primary module stably work; in addition, for an output voltage of a system, because soft switching is used to change the load in load switching, the impact of a load change on the system resonance is reduced, and the stability of a secondary output voltage is ensured.

Description

technical field [0001] The invention belongs to the field of wireless power transmission, and in particular relates to a wireless power transmission system adaptable to multi-load dynamic switching. Background technique [0002] Most of the traditional power transmission methods transmit power to end products through wires or sockets. This transmission method will bring friction and easily generate sparks and other problems, which will affect the safety and reliability of electrical equipment. Wireless power transmission technology can free us from The traditional power transmission method realizes a new type of non-contact power transmission. Magnetic coupling resonant wireless power transmission technology uses magnetic coupling and resonance technology to realize wireless transmission of electric energy, which has a longer transmission distance and higher transmission efficiency. Compared with electromagnetic wave and electromagnetic induction wireless power transmission ...

AI Technical Summary

Problems solved by technology

In practical applications, when performing multi-load dynamic switching, the reflected impedance of the secondary side module will change, and the sudden change of reflected impedance will cause a sudden change in the resonance frequency of the entire system, and the transient driving frequency in the power supply of the transmitter cannot be maintained at the resonance frequency. Consistent, the system works in a detuned state, which will cause the current of the switching device in the inverter circuit to overcurrent, burn the switching device in severe cases, or trigger the self-protection circuit, causing the system to fail; at the same time, the output voltage of the secondary module will appear overvoltage And undervoltage problems, which affect the normal operation of the load, resulting in the wireless power transmission system not working properly

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