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公开(公告)号：US20060038466A1
公开(公告)日：2006-02-23
申请号：US11249640
申请日：2005-10-13
IPC分类号： H01L41/107
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.
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12.发明申请公开(公告)号：US20050285478A1
公开(公告)日：2005-12-29
申请号：US11217004
申请日：2005-08-31
IPC分类号： H01L41/04 , H05B41/282 , H05B41/285 , H05B41/392 , 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.
摘要翻译： 提供一种用于压电变压器的驱动电路，其确保连接到压电变压器的所有冷阴极管的照明，并且在稳定点亮期间减少阴极管之间的亮度差异，从而增强可靠性和性能。 连接到压电变压器的次级侧的多个冷阴极管和与多个冷阴极管串联连接的冷阴极管输出检测器电路，用于检测各个冷阴极管的输出状态 并且基于来自冷阴极管输出检测器电路的检测信号来控制压电变压器的驱动。 因此，压电变压器与一个冷阴极管执行相同的操作。
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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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14.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：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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公开(公告)号：US6084336A
公开(公告)日：2000-07-04
申请号：US154737
申请日：1998-09-17
IPC分类号： H01L41/107
CPC分类号： H01L41/107
摘要： A piezoelectric transformer has;a rectangular plate having a principal direction coinciding with a longitudinal direction or a lateral direction, said plate being made of a piezoelectric material;one set of primary electrodes which are formed on faces of said rectangular plate, respectively, said faces being opposed to each other in a thickness direction; andone set of secondary electrodes which are formed on said rectangular plate, whereinat least one of said primary electrodes covers a center portion of said rectangular plate with respect to said principal direction, and is disposed so as not to overlap with end portions of said rectangular plate with respect to said principal direction,each of said secondary electrodes consists of a single electrode member, andan AC voltage applied between said primary electrodes causes said rectangular plate to produce such a mechanical vibration of a half wave length that said rectangular plate expands and contracts in said principal direction, thereby outputting a voltage from said secondary electrodes.
摘要翻译： 压电变压器有; 具有与长度方向或横向一致的主方向的矩形板，所述板由压电材料制成; 分别形成在所述矩形板的表面上的一组初级电极，所述面在厚度方向上彼此相对; 以及形成在所述矩形板上的一组二次电极，其中所述主电极中的至少一个相对于所述主方向覆盖所述矩形板的中心部分，并且被设置成不与所述矩形板的端部重叠 相对于所述主方向的矩形板，每个所述次级电极由单个电极构件组成，并且施加在所述主电极之间的AC电压使所述矩形板产生半波长的机械振动，所述矩形板膨胀 并沿所述主方向收缩，由此从所述次级电极输出电压。
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18.发明授权公开(公告)号：US06911787B2
公开(公告)日：2005-06-28
申请号：US10719546
申请日：2003-11-21
申请人： Katsu Takeda , Hiroshi Nakatsuka
发明人： Katsu Takeda , Hiroshi Nakatsuka
IPC分类号： G02F1/133 , G09G3/34 , H01L41/04 , H05B41/282 , H05B37/02
CPC分类号： H05B41/2828 , H01L41/044
摘要： There is provided a method for driving a piezoelectric transformer in which a driving efficiency and the reliability in terms of withstand power and distortion can be enhanced by suppressing a higher order vibration mode exited by a harmonic component other than a driving frequency included in a driving signal of the piezoelectric transformer without using an inductive element. The driving signal applied to a primary side electrode of the piezoelectric transformer is a signal in a rectangular waveform having a time period δT in which a level is a maximum potential (2V) or a minimum potential (0), obtained by multiplying a period T of the driving signal by a predetermined time ratio δ. The time ratio δ is set to be smaller than 0.5 and so as to minimize a sum of ratios of amplitudes of respective higher order vibration modes with respect to an amplitude of a vibration mode exciting the piezoelectric transformer.
摘要翻译： 提供了一种用于驱动压电变压器的方法，其中通过抑制由包括在驱动信号中的驱动频率以外的谐波分量退出的高阶振动模式，可以提高驱动效率和耐受功率和失真方面的可靠性 的压电变压器，而不使用电感元件。 施加到压电变压器的初级侧电极的驱动信号是具有时间段ΔT的矩形波形的信号，其中电平是通过将周期T乘以的最大电位（2V）或最小电位（0） 的驱动信号。 将时间比Δ设定为小于0.5，并且使得相对于激励压电变压器的振动模式的振幅的各较高阶振动模式的振幅比之和最小化。
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公开(公告)号：US07012578B2
公开(公告)日：2006-03-14
申请号：US10454975
申请日：2003-06-05
申请人： Hiroshi Nakatsuka , Katsu Takeda
发明人： Hiroshi Nakatsuka , Katsu Takeda
IPC分类号： G09G3/18
CPC分类号： H05B41/3927 , H05B41/2827 , H05B41/2828
摘要： The present invention provides a light emission control device that can drive a plurality of cold cathode fluorescent tubes independently only by connecting a plurality of piezoelectric transformers to only one piezoelectric inverter circuit. A first phase control portion that outputs a signal for changing a phase of the third and the fourth driving control signals with respect to a phase of the first and the second driving control signals to the second driving portion, and a second phase control portion that outputs a signal for changing a phase of the fifth and the sixth driving control signals with respect to a phase of the first and the second driving control signals to the third driving portion are provided in the piezoelectric inverter circuit. Thus, the phase difference of the driving control signals is controlled, so that the output powers to the plurality of cold cathode fluorescent tubes are controlled.
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20.发明授权Piezoelectric transformer, power supply circuit and lighting unit using the same 失效压电变压器，电源电路和照明单元使用相同公开(公告)号：US07202592B2
公开(公告)日：2007-04-10
申请号：US10843015
申请日：2004-05-11
申请人： Katsu Takeda , Hiroshi Nakatsuka
发明人： Katsu Takeda , Hiroshi Nakatsuka
IPC分类号： H02N1/04
CPC分类号： H05B41/2822 , H01L41/044 , H01L41/107
摘要： A piezoelectric transformer includes a piezoelectric ceramic disc having one face and the other face opposite to each other in a thickness direction. A pair of low-impedance portions acting as one of a driving portion and a generator portion are disposed in the piezoelectric ceramic disc symmetrically with respect to a central axis of the piezoelectric ceramic disc, while a pair of high-impedance portions acting as the other of the driving portion and the generator portion are disposed in the piezoelectric ceramic disc symmetrically with respect to the central axis so as to be electrically separated from the low-impedance portions such that the piezoelectric transformer is driven in a radial extensional vibration mode of the piezoelectric ceramic disc.
摘要翻译： 压电变压器包括压电陶瓷盘，其具有一个面，另一个面在厚度方向上彼此相对。 作为驱动部和发电机部之一的一对低阻抗部分相对于压电陶瓷盘的中心轴对称设置在压电陶瓷盘中，而一对作为另一个的高阻抗部 驱动部分和发电机部分相对于中心轴对称地设置在压电陶瓷盘中，以便与低阻抗部分电隔离，使得压电变压器以压电变压器的径向延伸振动模式驱动 陶瓷盘。
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