As it is both significant and practical to study how the bidirectional wireless power transmission system can be applied to the monitor control of electric vehicle under V2G environment, this paper analyzes how the bidirectional wireless power transmission system works, based on which, probes into the phase difference θ, which will influence the energy transmission direction, and ratio-voltage σ, which will influence transmission efficiency. It also promotes that coaxial installation of detection coil on secondary side and main power coil can monitor the 2 parameters in real time, and it also provides how to access the parameter. By simulation and experiments, it proved the feasibility of this method, providing a reference research approach on related studies.
With the development of smart technology and the improvement of living standard, the demand for a life with smart home appliance is increasing. The advancement of wireless power transfer technology has provided an opportunity to charge home appliance wirelessly. The combination of smart home appliance and wireless power transfer will make life more intelligent. The one-to-many wireless power supply system of smart home appliance and its control strategy optimization is studied. Firstly, the equivalent circuit model of one-to-many wireless power supply system of smart home appliance is set up and the influence of load on the output power and transfer efficiency is analyzed. Afterwards, the control strategy of power is studied, including power stability and emergency power supply. Finally, the experiment platform of one-to-many wireless power supply system is constructed, and the power transfer capacity and load property is tested, verifying the theoretic analysis.
Abstract. By taking ring main unit(RMU) as a research object, this work calculates the grades of evaluating the healthy running state of RMUs, constructs the evaluation indexes system, measures the weights of state variables and finally determine comprehensive evaluated results. The modeling the characteristics of healthy running status of RMU is of significance to power distribution management.
As household appliances become more and more intelligent, increasingly strict demands are put forward for their power supply. Existing draw-out power supply mode of household appliances has many shortcomings including low waterproof grade, touch spark, and wire constraint. Considering this, a tail-free power supply system based on magneticallycoupled resonant wireless power transfer (MCRWPT) technology is investigated. Aiming at the coupling problems, such as frequency splitting, of the resonator during the design of the system, the analytic calculation is adopted to obtain the advisable domain values of mutual inductance that can evade frequency splitting. On this basis, the authors also carry out theoretical calculation on the combination modes of disc spiral coils and spatial spiral coils so as to attain the accurate mutual inductance between the resonators. In addition, a calculation method more accurate than the traditional Neumann formula is also proposed. The theoretical analysis is finally validated by conducting simulation and experiments and comparing the obtained results.
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