| In power transmission technology,converters usually adopt the cascade structure of multiple switch tubes and need to provide multiple independent power supply for multiple gate drivers to achieve the purpose of electrical isolation.Because the traditional power supply mode has the p roblems of complex design and high control difficulty,the new power supply mode has become the current research hotspot.In this paper,a wireless power transfer(WPT)power supply method for multiple gate drivers is studied,which provides a new choice for the future multi-gate driver power supply system in medium and high capacity power situations.Gate drivers require a constant and isolated power supply system.However,in order to achieve good performance,the gate driver will switch the driving resistance during the working process,thus affecting the stability of the supply voltage of the WPT system,Therefore,it is required that the WPT system can maintain multiple constant voltarge power supply when the driving resistance is switched.In the research of WPT technology,the method of passive compensation network design can be used to transform the impedance of WPT system to realize the decoupling between the load and the output,and achieve the independent output effect under the load independent characteristics.However,the current compensation network is mainly designed for single load,which is difficult to meet the requirement of supplying power to multiple gate drivers.In this paper,the high order compensation network is used as a relay unit to supply power to multiple gate drivers by domino WPT system which transmits energy to the backward stage at the same time in this stage,realizing the characteristics of zero phase angle(ZPA)between constant voltage output and input voltage and current under multi-channel load independent characteristics.In this paper,the output characteristics of T-type,π-type compensation network,and high-order combined compensation network under different working modes are analyzed.Combined with the power supply requirements of multiple gate drivers,S-CLC compensation network working in CV-CC-CV mode is selected as the relay unit of the power supply system.Then,the method of realizing constant voltage output and ensuring input ZPA under load independent characteristics is analyzed,and the main parameters affecting the multiplex voltage are given.At the same time,the main factors affecting the load independent characteristics of the system are analyzed when considering the parasitic resistance,the design method of uniform voltage distribution is given,and the resonant conditions which should be satisfied by the compensating element are deduced.Finally,the correctness and validity of the theoretical analysis are verified by the simulation and experimental results. |
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