| Summary: | 碩士 === 國立臺灣大學 === 工程科學及海洋工程學研究所 === 98 === In recent years, LED is widely applied to LCD screen backlight, LED backlight will be a large market when solve the problem of the LED efficiency and the problem of current balance and LED arrangement in the larg size LCD monitor. In this thesis, the piezoelectric materials were adopted as piezoelectric capacitance to design LC oscillator and applied to piezoelectric based inverter to light LED bar. The piezoelectric based inverter can achieve high power, high stability and low profile.
For getting the relationship between the static capacitance and the limit mechanical current and temperature, tested the limit current in different diameter and different thickness. The design for the LC oscillator, suitable inductor of series inductance can make the oscillator work stable and achieve ZVS to reduce the power loss.
By comparing the input power of DC/AC inverter and DC/DC converter, the efficiency of DC/AC inverter is better than DC/DC converter, so the piezoelectric capacitance is appropriate for design the piezoelectric based inverter.
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