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公开(公告)号：US07038354B2
公开(公告)日：2006-05-02
申请号：US10306516
申请日：2002-11-27
IPC分类号： H01L41/107
CPC分类号： H05B41/2822 , H01L41/044 , H05B41/2855 , H05B41/392
摘要： A driving circuit for a piezoelectric transformer is provided, which ensures lighting of all the cold-cathode tubes connected to the piezoelectric transformer, and reduces the difference in brightness between the cathode tubes during steady lighting, thereby enhancing reliability and performance. A plurality of cold-cathode tubes connected to a secondary side of the piezoelectric transformer, and a cold-cathode tube output detector circuit connected in series to a plurality of cold-cathode tubes, for detecting an output state of the respective cold-cathode tubes are provided, and the driving of the piezoelectric transformer is controlled based on a detection signal from the cold-cathode tube output detector circuit. Because of this, the piezoelectric transformer performs the same operation as that with respect to one cold-cathode tube.
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12.发明授权Piezoelectric transformer, piezoelectric transformer unit, inverter circuit, light emission control device, and liquid crystal display device 失效压电变压器，压电变压器单元，逆变电路，发光控制装置和液晶显示装置公开(公告)号：US07030538B2
公开(公告)日：2006-04-18
申请号：US10172589
申请日：2002-06-14
IPC分类号： H01L41/08
CPC分类号： H05B41/2822 , H01L41/107
摘要： A low loss, small scale piezoelectric transformer, suited for a cold cathode tube load, and having a high effective coupling factor, is provided using a piezoelectric plate having a single polarization direction. Controlling the dimensions of the third electrode portion 15a constituting the high impedance portion makes it possible easily to adjust the capacitance of the electrostatic capacitor formed between the first electrode portion 12 and the third electrode portion in accordance with the load. Also, the second electrode portion 13 and the fourth electrode portion 15b constituting the low impedance portion are substantially equal in area and the third electrode portion and the fourth electrode portion are formed in one piece, so that energy propagation efficiency can be increased. Consequently, the effective coupling factor resulting from the electrode structure and the vibration mode can be kept high even if the capacitance is changed freely, and thus high element efficiency and a small amount of generated heat can be maintained and stress can be decreased.
摘要翻译： 使用具有单一偏振方向的压电板，提供适用于冷阴极管负载并具有高有效耦合系数的低损耗小型压电变压器。 控制构成高阻抗部分的第三电极部分15a的尺寸使得可以容易地根据负载来调节形成在第一电极部分12和第三电极部分之间的静电电容器的电容。 此外，构成低阻抗部的第二电极部13和第四电极部15b的面积大致相等，第三电极部和第四电极部形成为一体，能够提高能量传播效率。 因此，即使电容自由变化，由电极结构和振动模式产生的有效耦合因子也能够保持较高，从而可以保持高的元件效率和少量的发热，并且可以降低应力。
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公开(公告)号：US06989626B2
公开(公告)日：2006-01-24
申请号：US10894757
申请日：2004-07-20
IPC分类号： H01L41/107
CPC分类号： H05B41/2822 , H01L41/107
摘要： A compact and high-power piezoelectric transformer is realized by using higher order longitudinal extensional mode vibrations and increasing an effective electromechanical coupling factor by a primary electrode which consists of plural electrodes.
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公开(公告)号：US06566821B2
公开(公告)日：2003-05-20
申请号：US10024415
申请日：2001-12-21
IPC分类号： H01L4108
CPC分类号： H05B41/2822 , H05B41/2855 , H05B41/392
摘要： The present invention relates to a drive device for one or more series-connected cold cathode fluorescent lamps having an electrical terminal at each end. The drive device has a piezoelectric transformer for converting by means of the piezoelectric effect a primary ac input applied to primary electrodes to a secondary ac output, which is removed from secondary electrodes; a drive arrangement for applying the primary ac input to the primary electrodes; and a brightness control circuit for controlling brightness. The drive device is configured so that the end electrical terminals of the cold cathode fluorescent lamp can be connected between the two secondary electrodes. The brightness control circuit detects the phase difference between the secondary ac output and the primary ac input. When the detected phase difference is greater than a specified phase difference, the drive arrangement reduces the power of the primary ac input applied to the primary electrodes. If the detected phase difference is less than the specified phase difference, the drive arrangement increases the power of the primary ac input applied to the primary electrodes.
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公开(公告)号：US07145281B2
公开(公告)日：2006-12-05
申请号：US11217004
申请日：2005-08-31
IPC分类号： H01L41/107
CPC分类号： H05B41/2822 , H01L41/044 , H05B41/2855 , H05B41/392
摘要： A driving circuit for a piezoelectric transformer is provided, which ensures lighting of all the cold-cathode tubes connected to the piezoelectric transformer, and reduces the difference in brightness between the cathode tubes during steady lighting, thereby enhancing reliability and performance. A plurality of cold-cathode tubes connected to a secondary side of the piezoelectric transformer, and a cold-cathode tube output detector circuit connected in series to a plurality of cold-cathode tubes, for detecting an output state of the respective cold-cathode tubes are provided, and the driving of the piezoelectric transformer is controlled based on a detection signal from the cold-cathode tube output detector circuit. Because of this, the piezoelectric transformer performs the same operation as that with respect to one cold-cathode tube.
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16.发明授权Driving circuit and driving method for piezoelectric transformer, backlight apparatus, liquid crystal display apparatus, liquid crystal monitor, and liquid crystal TV 失效压电变压器，背光装置，液晶显示装置，液晶监视器和液晶电视的驱动电路和驱动方法公开(公告)号：US07034800B2
公开(公告)日：2006-04-25
申请号：US10295401
申请日：2002-11-14
CPC分类号： H05B41/3925 , H05B41/2827 , H05B41/2828 , Y02B20/186
摘要： A driving circuit for a piezoelectric transformer is provided, which is capable of driving a piezoelectric transformer at a high efficiency and with low distortion, and being miniaturized. At the commencement of lighting a cold-cathode fluorescent tube, a digital controller fixes frequencies of first and second control signals VC1 and VC2 at a predetermined frequency and controls the phase difference therebetween so that an output power of the piezoelectric transformer becomes from substantially zero to a predetermined output power. After lighting of the cold-cathode fluorescent tube, the digital controller controls the phase difference between the first and second control signals VC1 and VC2 so that current detecting data CD substantially is matched with reference data RD.
摘要翻译： 提供了一种用于压电变压器的驱动电路，其能够以高效率和低失真地驱动压电变压器并且小型化。 在开始冷阴极荧光灯照明时，数字控制器以预定频率固定第一和第二控制信号VC 1和VC 2的频率，并且控制它们之间的相位差，使得压电变压器的输出功率基本上变为 零到预定的输出功率。 在冷阴极荧光灯照明之后，数字控制器控制第一和第二控制信号VC 1和VC 2之间的相位差，使得电流检测数据CD基本上与参考数据RD匹配。
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17.发明授权Piezoelectric vibrator ladder-type filter using piezoeletric vibrator and double-mode piezolectric filter 失效使用压电振动器和双模压电滤波器的压电振子梯形滤波器公开(公告)号：US06992424B2
公开(公告)日：2006-01-31
申请号：US10467742
申请日：2002-02-07
申请人： Yukinori Sasaki , Tetsuro Shimamura , Tetsuo Kawasaki , Kazunari Nishihara , Tetsuya Furihata , Kuniaki Matsushita , Katsunori Moritoki , Katsu Takeda
发明人： Yukinori Sasaki , Tetsuro Shimamura , Tetsuo Kawasaki , Kazunari Nishihara , Tetsuya Furihata , Kuniaki Matsushita , Katsunori Moritoki , Katsu Takeda
IPC分类号： H01L41/08
CPC分类号： H03H9/177 , H03H9/02031 , H03H9/02157 , H03H9/562 , H03H9/581
摘要： A piezoelectric vibrator which uses lithium tantalate as a piezoelectric material and of which main vibration is thickness shear vibration. The thickness direction of the vibrator forms angle of 0°±5° to the X-axis of a single crystal. The longitudinal direction of vibrator lies, with the X-axis used as a rotation axis, in direction n +57°±2° clockwise from the Y-axis of the single crystal. A ratio L/H of the length L of the vibrator to the thickness H is not less than 15. A ratio Le/H of the length Le of the exciting electrode to the thickness H of the vibrator element portion is 3–6. Accordingly, a vibrator having improved temperature characteristics and a large Q is realized.
摘要翻译： 一种使用钽酸锂作为压电材料并且主要振动是厚度剪切振动的压电振动器。 振动器的厚度方向与单晶的X轴形成0°±5°的角度。 振动器的纵向方向以X轴用作旋转轴线，从单晶Y轴顺时针方向n + 57°±2°。 振动器的长度L与厚度H的比L / H不小于15.激励电极的长度Le与振动元件部分的厚度H之比Le / H为3-6。 因此，实现了具有改善的温度特性和大的Q的振动器。
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公开(公告)号：US06812623B2
公开(公告)日：2004-11-02
申请号：US10253757
申请日：2002-09-23
IPC分类号： H01L4108
CPC分类号： H05B41/2822 , H01L41/107
摘要： A compact and high-power piezoelectric transformer is realized by using higher order longitudinal extensional mode vibrations and increasing an effective electromechanical coupling factor by a primary electrode which consists of plural electrodes.
摘要翻译： 通过使用高阶纵向拉伸模式振动并通过由多个电极组成的主电极增加有效的机电耦合系数来实现小型和大功率的压电变压器。
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19.发明授权公开(公告)号：US06433458B1
公开(公告)日：2002-08-13
申请号：US09834820
申请日：2001-04-13
IPC分类号： H01L4108
摘要： A method and unit for driving a small high-efficiency piezoelectric transformer allowing a cold-cathode tube to have stable luminance by detecting only an active current flowing in the cold-cathode tube based on a phase difference between an output current and voltage of the piezoelectric transformer, removing a reactive current caused by stray capacitance formed between the cold-cathode tube and a reflector, and accurately controlling driving of the piezoelectric transformer so that a constant active current is detected.
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20.发明授权Piezoelectric transformer, piezoelectric transformer drive circuit, piezoelectric transformer drive method and cold cathode tube drive apparatus using piezoelectric transformer 失效压电变压器，压电变压器驱动电路，压电变压器驱动方法和使用压电变压器的冷阴极管驱动装置公开(公告)号：US06794796B2
公开(公告)日：2004-09-21
申请号：US10338754
申请日：2003-01-09
IPC分类号： H01L4108
CPC分类号： H01L41/107 , H01L41/044 , H05B41/2822 , H05B41/2855 , H05B41/3925
摘要： The piezoelectric transformer of the present invention has a piezoelectric element 109 mainly formed of a piezoelectric material, primary electrodes 101U and 101D which are formed on the piezoelectric element 109 and to which a voltage is applied, a secondary electrode 102 which is formed on the piezoelectric element 109 and from which a voltage higher than the voltage applied to the primary electrode is output, and a sensor electrode 103 which is formed on the piezoelectric element 109 and from which a voltage lower than the output voltage of the secondary electrode is output.
摘要翻译： 本发明的压电变压器具有主要由压电材料形成的压电元件109，形成在压电元件109上并施加有电压的初级电极101U和101D，形成在压电元件上的二次电极102 输出比施加到初级电极的电压高的电压，并且形成在压电元件109上并且从其输出低于次级电极的输出电压的电压的传感器电极103。
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