Parameter Design Method for E-class Inverter ZVS Work in Wireless Power Transfer System

Abstract

The invention discloses a parameter design method for the ZVS operation of a class E inverter in a wireless energy transmission system. First, the impedance of the receiving side is converted into the equivalent impedance of the primary side load by using a mutual inductance model, and then the class E inverter is calculated according to the Raab condition. The electrical parameters of the input choke inductance, switching tube shunt capacitance and primary side compensation capacitor, and then use the circuit simulation software to simulate the designed system and observe whether the voltage waveform at both ends of the E-type switching tube achieves soft switching (ZVS) ; If the soft switch is turned on, the design process is over, otherwise, the capacitance value of the parallel capacitor of the switch tube can be reduced first, and then the capacitance value of the primary side compensation capacitor can be increased, and then the simulation software can be used to observe whether the E-type switch tube achieves ZVS, and repeat the above operation Until the Class E switching tube realizes ZVS. The invention can quickly adjust the capacitance parameters of the E-class inverter in the wireless energy transmission system, so that the E-class switch tube works under the working condition of ZVS, which is beneficial to reduce the turn-on loss of the switch tube.

Description

technical field [0001] The invention relates to the technical field of inverter design for a wireless power transmission system, in particular to a parameter design method capable of realizing the ZVS operation of an E-type inverter of the wireless power transmission system. Background technique [0002] As a new power transmission technology, magnetically coupled resonant wireless power transmission technology MCR-WPT (magnetically coupled resonant wireless power transmission) is widely used in electric vehicles, implanted devices, consumer electronics and Robotics and other fields have broad application prospects. The MCR-WPT based on the E-type inverter has good high-frequency characteristics, which makes it better adapt to the operating frequency scenario above MHz. In addition, compared with other types of inverters, Class E inverters are used as the AC power input of the MCR-WPT system, which can effectively simplify the circuit structure of the inverter, and have a w...

AI Technical Summary

Problems solved by technology

However, in the actual design process, since the MCR-WPT is often not working under the best load conditions, the Class E circuit designed according to this empirical formula often cannot directly meet the ZVS, so the capacitance parameters need to be adjusted one step

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