Characteristics of high frequency gate driver by the use of LC self-excitation oscillator

The electronic circuits are miniaturized because the technique on integrated circuits has been developing. The reactance components of converters are miniaturized by using high switching frequency. The resonant converters are useful because of the low switching loss in semiconductor switches. At the resonant converters, raising or lowering output voltage is fundamentally controlled by the switching frequency. For high frequency switching in main switch, high frequency driver circuit is required. However, we have the difficult situation to obtain comparators capable of high frequency operation. Therefore, the self-excitation LC oscillation circuit is examined as the main switch drive circuit. The relatively large gate current must be poured or pulled at turn-on or turn-off. In this case, the capacitance at gate-source should be used as the component of resonant circuit. In the practical circuit, variable capacitance diodes can be included in the resonant circuit. The dc voltage from outside can control the output of the converter. In this paper, we researched about a self-excitation LC oscillation circuit by both the experiment and the simulation.