| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 94 === The purpose of this thesis is to implement a series resonant type high voltage generator used for testing high power electric device. Under high voltage testing procedure, the impedance characteristic of the terminal of the under-test device is similar to capacitance. Therefore, the series resonant method can be employed with treating the device terminals as the capacitor needed in the resonant circuit. The proposed system is a standard second-order system, so the resonant frequency can be estimated through the transient responses of the system. Besides, the resonant condition is monitored by minimizing the total harmonic distortion(THD) of the voltage applied to the device terminals. Because the resonant frequency is device dependent, a tunable digital band-pass filter is designed for separating the fundamental component from the output voltage. In this thesis, we use perturbation and observeation method to track the resonant frequency of the system. A DSP-based controller is employed to regulate the output voltage. Both the simulation and experimental results are obtained to show the validity of the proposed system.
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