-
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.
-
2.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。
-
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.
-
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。
-
5.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。
-
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.
-
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.
-
8.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。
-
公开(公告)号：US06737816B2
公开(公告)日：2004-05-18
申请号：US09852621
申请日：2001-05-11
IPC分类号： G05F100
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.
-
公开(公告)号：US06583534B1
公开(公告)日：2003-06-24
申请号：US09588079
申请日：2000-06-05
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.
-
-
-
-
-
-
-
-
-
搜索结果
114 条记录 (耗时 0.03 秒)