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    • 11. 发明授权
    • Inverter power source apparatus using a piezoelectric transformer
    • 变压器电源设备采用压电变压器
    • US5796213A
    • 1998-08-18
    • US706906
    • 1996-09-03
    • Osamu Kawasaki
    • Osamu Kawasaki
    • H01L41/04H05B41/282H05B41/392H05B37/02
    • H01L41/044H05B41/2822H05B41/392
    • An inverter power source apparatus using a piezoelectric transformer, has: variable oscillating device for oscillating a pulse signal; pulse-width changing device for changing a width of said pulse signal of said variable oscillating device; driving device for generating a driving signal on the basis of an output of said pulse-width changing device; a piezoelectric transformer which is driven by said driving signal, drives a predetermined load, and has input and output electrodes; detecting device for detecting a relationship between said driving signal and a resonance frequency of said piezoelectric transformer, and for, on the basis of a result of the detection, controlling a frequency of said oscillation signal of said variable oscillating device so that a difference between said resonance frequency and a frequency of said driving signal is substantially within a preset range; and pulse-width controlling device for, when a detection results of said detecting device shows that said difference between said resonance frequency and said frequency of said driving signal is substantially within said preset range, controlling said pulse-width changing device so that a current flowing through said load is substantially constant.
    • 一种使用压电变压器的逆变器电源装置,具有:用于振荡脉冲信号的可变振荡装置; 脉冲宽度改变装置,用于改变所述可变振荡装置的所述脉冲信号的宽度; 驱动装置,用于根据所述脉冲宽度改变装置的输出产生驱动信号; 由所述驱动信号驱动的压电变压器驱动预定的负载,并具有输入和输出电极; 用于检测所述驱动信号与所述压电变压器的谐振频率之间的关系的检测装置,并且基于所述检测结果,控制所述可变振荡装置的所述振荡信号的频率,使得所述 谐振频率和所述驱动信号的频率基本上在预设范围内; 以及脉冲宽度控制装置,当所述检测装置的检测结果显示所述谐振频率和所述驱动信号的所述频率之间的所述差异基本上在所述预设范围内时,控制所述脉冲宽度改变装置使得电流流动 通过所述负载基本上是恒定的。
    • 20. 发明授权
    • Resonator ladder surface acoustic wave filter suppressing spurious
signals
    • 谐振器梯形声波滤波器抑制杂散信号
    • US5729186A
    • 1998-03-17
    • US629978
    • 1996-04-09
    • Shun-ichi SekiKazuo EdaYutaka TaguchiKeiji OnishiHiroki SatoOsamu Kawasaki
    • Shun-ichi SekiKazuo EdaYutaka TaguchiKeiji OnishiHiroki SatoOsamu Kawasaki
    • H03H9/145H03H9/64
    • H03H9/6483H03H9/1452
    • A resonator ladder surface acoustic wave (SAW) filter, which has a wide and flat pass band without spurious signals therein is provided. An input electrode, a serial arm SAW resonator, an output electrode, a parallel arm SAW resonator and a ground electrode are respectively formed on a 41.degree.-rotated Y-cut X-propagation lithium niobate substrate. The serial arm SAW resonator comprises a pair of interdigital transducers (IDTs) to excite SAW, one of which is connected to the input electrode. The output electrode is connected to the other IDT of the serial arm SAW resonator. The parallel arm SAW resonator comprises a pair of IDTs to excite SAW, one of which is connected to the output electrode. And the ground electrode is connected to the other IDT of the parallel arm SAW resonator. The IDTs are metal films of Al or Al-based alloy, and the thickness of the metal films ranges from 2.5% to 7.5% of the electrode cycle of the IDT of the parallel arm SAW resonator.
    • 提供了一种谐振器梯形声表面波(SAW)滤波器,其具有宽而平坦的通带,无杂散信号。 分别在41°旋转的Y切X传播铌酸锂基板上形成输入电极,串联臂SAW谐振器,输出电极,并联臂SAW谐振器和接地电极。 串联臂SAW谐振器包括一对用于激励SAW的叉指式换能器(IDT),其中一个连接到输入电极。 输出电极连接到串联臂SAW谐振器的另一IDT。 并联臂SAW谐振器包括一对激励SAW的IDT,其中一个连接到输出电极。 并且接地电极连接到并联臂SAW谐振器的另一个IDT。 IDT是Al或Al基合金的金属膜,金属膜的厚度在平行臂SAW谐振器的IDT的电极周期的2.5〜7.5的范围内。