High-Precision Control for ZVS Inverter to Reduce Nonlinear Distortion of Semiconductor Voltage Drop

Owing to low switching loss and low dead-time effect, the extra-LC auxiliary resonant snubber converter as a zero-voltage-switching inverter is very suitable for high-precision applications. However, the semiconductor voltage drop caused by the on-resistance is one of the main problems in the high-precision application, which has not been researched before. Besides, the conventional forward compensation method leads to obvious error due to the nonlinear characteristic of on-resistance. Thus, this letter proposed a high-precision control through controlling the auxiliary circuit current to reduce the nonlinear distortion caused by the semiconductor voltage drop. Compared with the forward compensation method, the on-resistance of the switches is not required to be estimated. In this letter, the voltage error caused by the on-resistance is analyzed. The proposed high-precision control is introduced. The experimental results demonstrate that the quality of the output current and voltage is improved by utilizing the proposed control method.