Dynamic tuning method for transmitting terminal frequency tracking of wireless electric energy transmission equipment

Abstract

The invention discloses a dynamic tuning method for transmitting terminal frequency tracking of wireless electric energy transmission equipment. According to the invention, the resonant frequency of a transmitting terminal circuit is tracked dynamically by using a principle that the ratio between a current effective value of a transmitting coil and a transmitting terminal DC-side power supply current effective value is the minimum during resonance of the transmitting terminal circuit, that is, the ratio between the current effective value of the transmitting coil and the transmitting terminal DC-side power supply current effective value is tracked through continuously tuning the operating frequency of an inverter, and the current ratio is enabled to dynamically stay at the minimum value in real time, so that dynamic tuning for frequency tracking is realized, and the transmitting terminal circuit is enabled to stay at or approach to a state of complete resonance, thereby improving the transmission power and the transmission efficiency of the wireless electric energy transmission equipment. In addition, the circuit of the dynamic tuning method is low in complexity degree, and the implementation cost is low, thereby being easy to popularize.

Description

technical field [0001] The invention relates to a dynamic tuning method for frequency tracking of a sending end of a wireless energy transmission device. Background technique [0002] Wireless power transmission technology is an emerging power transmission technology with a wide range of applications, such as electric vehicles, medical equipment, lighting, underwater detection and so on. Wireless power transmission technology has greatly improved the power supply flexibility of electrical equipment, and at the same time avoided the problems of sparks and wear in traditional contact power supply methods, and improved the safety of power supply for equipment, so it has great development potential. [0003] Compared with other wireless power transmission technologies, inductive wireless power transmission technology can better perform short-distance high-power transmission, and has better development and application prospects. The inductive wireless power transmission device c...

AI Technical Summary

Problems solved by technology

However, since the capacitor array can only work on a limited number of discrete capacitance value points, the adjustment range is limited, and continuous stepless precise tuning cannot be achieved.

At the same time, frequency tracking algorithms are also used to track the resonant frequency, but most of the existing frequency tracking algorithms use hardware circuits to measure the phase difference between the inverter voltage and current, and then perform frequency tracking control of the inverter, but due to noise, etc. The influence of factors will lead to errors in the phase difference measurement of inverter voltage and current, which will not easily make the device in a resonant state, and increase the complexity of the circuit and the cost is high