- 文献综述（或调研报告）：
The main purpose of this design is to convert a 220V three-phase voltage source to a maximum 750V load using 50kW of power. Therefore the literature reviewed will help me design this circuit and simulate it using Matlab software.
Paper [1] presents the different design considerations that need to be considered for design of a high-power density Zero-Voltage switched PWM MOSFET-based converter. Aspects include; the required dead time between switching of the different transistors during operation, the Zero-Voltage switching range of operation for a specified load current which has to be above a certain critical value for Zero-Voltage switching to occur and how to choose the switching frequency, leakage inductance and duty cycle.
The duty cycle has to be chosen such that for a given power, input-output voltage ratio, and maximum duty cycle, the transformer turns ratio, switching frequency and leakage inductance have to be chosen to satisfy;
1 gt; Dmax gt; fs ) (1)
obtained from fig. 1, where Np is the number of turns in the transformer primary side, Ns the number of turns in the transformer secondary side, Llk the leakage inductance and fs the switching frequency,
Rrsquo;= Rload(2
Fig. 1
The current flowing through the leakage inductance Llk has to be greater than the critical current, Icrit in the primary circuit for Zero-Voltage switching to occur. This is calculated using the equation below
Icrit2 = (2)
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