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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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2.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：US06509700B2
公开(公告)日：2003-01-21
申请号：US09987869
申请日：2001-11-16
IPC分类号： G05F100
CPC分类号： H05B41/2827 , Y10S315/05
摘要： The invention provides an apparatus and a method for driving a cathode discharge tube such that the discharge starting voltage can be lowered by simple construction. At the start of lighting a cathode discharge tube light, AC voltage applied to the cathode discharge tube is raised at a speed slower than a rise speed of the cathode discharge tube. By lighting the cathode discharge tube in this way, the lighting start voltage can be reduced.
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4.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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5.发明授权Method of driving a piezoelectric transformer and power source apparatus using the same 失效驱动压电变压器的方法及使用其的电源装置公开(公告)号：US06720705B2
公开(公告)日：2004-04-13
申请号：US09930184
申请日：2001-08-16
IPC分类号： H01L4106
CPC分类号： H01L41/044 , H01L41/107 , H05B41/2822
摘要： The invention provides a method of driving a piezoelectric transformer and a power source apparatus using the same. For a circuit for driving a piezoelectric transformer which steps up a voltage input from a primary electrode by a piezoelectric effect to output the stepped up voltage from a secondary electrode, the gradient (linear differential value) of a step-up ratio at the piezoelectric transformer is detected, and the detected gradient is used to control the driving frequency for the piezoelectric transformer so that the driving frequency approaches to the resonant frequency of the piezoelectric transformer.
摘要翻译： 本发明提供驱动压电变压器的方法和使用其的电源装置。 对于用于驱动压电变压器的电路，其通过压电效应升高从初级电极输入的电压，以从次级电极输出升压电压，压电变压器的升压比的梯度（线性微分值） 并且使用检测到的梯度来控制压电变压器的驱动频率，使得驱动频率接近压电变压器的谐振频率。
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6.发明授权Driving method and driving circuit for piezoelectric transformer, cold cathode tube emission device, liquid crystal panel and liquid crystal panel built-in apparatus 失效压电变压器，冷阴极管发射装置，液晶面板和液晶面板内置装置的驱动方法和驱动电路公开(公告)号：US06509671B2
公开(公告)日：2003-01-21
申请号：US09870979
申请日：2001-05-31
IPC分类号： H01L4108
CPC分类号： H05B41/2822 , H01L41/044
摘要： A driving method and a driving circuit for a piezoelectric transformer are capable of driving the piezoelectric transformer with high driving efficiency independently of an impedance change of a load such as a cold cathode tube by corresponding to the characteristic variance of the piezoelectric transformer, thereby also suppressing mechanical damage to be imposed on the piezoelectric transformer itself even if the load changes abruptly. The piezoelectric transformer is driven with a predetermined first frequency, and a power supply for a load connected to the secondary side of the piezoelectric transformer is started, and when an impedance of a load changes and reaches a predetermined impedance during the power supply, the driving frequency of the piezoelectric transformer is changed without a sweep from the first frequency to a predetermined second frequency. Furthermore, the second frequency is determined by detecting characteristics of the piezoelectric transformer before supplying the load steadily with electric power.
摘要翻译： 用于压电变压器的驱动方法和驱动电路能够独立于诸如冷阴极管的负载的阻抗变化而驱动具有高驱动效率的压电变压器，与压电变压器的特性变化相对应，从而也抑制 即使负载突然变化，也会对压电变压器本身施加机械损伤。 压电变压器以预定的第一频率驱动，并且开始连接到压电变压器的次级侧的负载的电源，并且当负载的阻抗在电源期间变化并达到预定的阻抗时，驱动 压电变压器的频率在没有从第一频率到预定的第二频率的扫描的情况下改变。 此外，通过在稳定地供给电力之前检测压电变压器的特性来确定第二频率。
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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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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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