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    • 7. 发明授权
    • Piezoelectric transformer inverter
    • 压电变压器
    • US6134133A
    • 2000-10-17
    • US389286
    • 1999-09-02
    • Takashi NomaIchiro YamawakiYasuyuki Morishima
    • Takashi NomaIchiro YamawakiYasuyuki Morishima
    • H02M7/48H02M7/538H02M7/539H05B41/24
    • H02M7/53806
    • A piezoelectric transformer inverter includes an inverter unit and a step-down chopper unit. The inverter unit includes a ceramic piezoelectric transformer whose secondary terminal is to be connected to a fluorescent tube, a drive unit which is connected to a primary terminal of the ceramic piezoelectric transformer, and an inverter control circuit for controlling luminance of the fluorescent tube to a desired value. The step-down chopper unit includes a switching device which is disposed on the side where the voltage of the inverter unit is input, a free wheeling device connected between the switching device and a reference potential, and a PWM feedback control circuit for providing a feedback control to maintain an average voltage of the rectangular-wave voltage of the switching device constant. In the piezoelectric transformer inverter, even when the feedback control by the PWM feedback control circuit is impossible, the on-duty of the chopper unit is restricted so that it is not greater than a given amount.
    • 压电变压器逆变器包括逆变器单元和降压斩波单元。 逆变器单元包括将二次端子连接到荧光管的陶瓷压电变压器,连接到陶瓷压电变压器的初级端子的驱动单元和用于将荧光管的亮度控制为 所需值。 降压斩波器单元包括设置在输入逆变器单元的电压的一侧的开关装置,连接在开关装置和参考电位之间的续流装置,以及用于提供反馈的PWM反馈控制电路 控制以保持开关装置的矩形波电压的平均电压恒定。 在压电变压器逆变器中,即使不能通过PWM反馈控制电路进行反馈控制,限制了斩波器单元的占空比,使其不大于给定量。