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    • 1. 发明授权
    • Driving method of piezoelectric transformer and driving circuit for the
same
    • 压电变压器的驱动方法和驱动电路相同
    • US6133672A
    • 2000-10-17
    • US252882
    • 1999-02-18
    • Hiroshi SasakiKouichi Iguchi
    • Hiroshi SasakiKouichi Iguchi
    • H05B41/24H01L41/04H02M7/48H02M7/537H02M11/00H05B41/282H01L41/107
    • H01L41/044H05B41/2822H05B41/2824
    • A circuit for driving a piezoelectric transformer, which is suitable for driving a piezoelectric transformer having a load such as a cold cathode fluorescent tube, and capable of coping with a wide range of a power source voltage and operating with high efficiency. The driving circuit includes a series circuit constituted by an equivalent input capacitance of the piezoelectric transformer and an inductance circuit and provided between power source terminals, and a switching transistor having both terminals of a main current path thereof in parallel connected to a part of the series circuit including the equivalent input capacitance. The inductance circuit includes a first inductance element of boosting constitution such as an auto-transformer and a second inductance element of non-boosting constitution such as a coil. The first and second inductance elements are selectable alternately. The driving circuit further includes an amplitude detection circuit for detecting an amplitude of a driving waveform between the terminals of the main current path of the switching transistor, and an inductance selection circuit for selecting the first inductance element when the amplitude is lower than a predetermined threshold value and for selecting the second inductance element when the amplitude exceeds the predetermined threshold value.
    • 一种用于驱动压电变压器的电路,其适用于驱动具有诸如冷阴极荧光管的负载的压电变压器,并且能够应对宽范围的电源电压并以高效率运行。 驱动电路包括由压电变压器的等效输入电容和电感电路构成的串联电路,并且设置在电源端子之间,以及开关晶体管,其两个端子的主电流通路并联连接到该系列的一部分 电路包括等效输入电容。 电感电路包括诸如自耦变压器的升压结构的第一电感元件和诸如线圈的非升压构造的第二电感元件。 第一和第二电感元件可交替地选择。 驱动电路还包括用于检测开关晶体管的主电流路径的端子之间的驱动波形的幅度的振幅检测电路和当振幅低于预定阈值时选择第一电感元件的电感选择电路 并且当振幅超过预定阈值时用于选择第二电感元件。
    • 3. 发明授权
    • Piezoelectric transformer driving curcuit and method capable of
stabilizing load current
    • 压电变压器驱动电路和能够稳定负载电流的方法
    • US5886514A
    • 1999-03-23
    • US982453
    • 1997-12-02
    • Kouichi IguchiHiroshi Sasaki
    • Kouichi IguchiHiroshi Sasaki
    • H05B41/24G05F5/00H01L41/04H01L41/107H02M3/24H02M11/00H05B41/282H05B41/285H05B41/392H05B37/02
    • G05F5/00H01L41/044H05B41/2822H05B41/2853H05B41/392
    • In a piezoelectric transformer driving circuit which comprises a boosting circuit (2) for boosting an input direct current voltage, a piezoelectric transformer (3), a current voltage converting circuit for converting a load alternating current which flows in the load (9), and a rectifier circuit (5), an input voltage detecting and comparing circuit (10) compares the input direct current voltage with a minimum voltage which is determined by a setting value of the load alternating current to produce a first voltage having a high level when the input direct current voltage is lower than the minimum voltage and to produce a second voltage having a low level when the input direct current voltage is higher than the minimum voltage. A reference voltage producing circuit (6a) produces one of first and second reference voltages in response to one of the first and second voltages. A main voltage comparing circuit (7) compares a rectified direct current voltage from the rectifier circuit with one of the first and second reference voltages to produce one of primary and secondary voltages. A frequency scanning oscillator (8) determines, in response to one of the primary and secondary voltages, a scanning direction of a driving frequency of a driving pulse signal which is supplied to the boosting circuit to supply the driving pulse signal to the boosting circuit. The input voltage detecting and comparing circuit may supply the first and second voltages to the current voltage converting circuit instead of the reference voltage producing circuit. In this event, the reference voltage producing circuit produces and supplies a reference voltage to the main voltage comparing circuit.
    • 在包括用于升压输入直流电压的升压电路(2)的压电变压器驱动电路中,压电变压器(3),用于转换在负载(9)中流动的负载交流电的电流电压转换电路,以及 整流电路(5),输入电压检测和比较电路(10)将输入直流电压与由负载交流电的设定值确定的最小电压进行比较,以产生具有高电平的第一电压 输入直流电压低于最小电压,并且当输入直流电压高于最小电压时产生具有低电平的第二电压。 参考电压产生电路(6a)响应于第一和第二电压之一产生第一和第二参考电压之一。 主电压比较电路(7)将来自整流电路的整流的直流电压与第一和第二参考电压中的一个进行比较,以产生一次电压和二次电压之一。 频率扫描振荡器(8)响应于主电压和次级电压之一确定提供给升压电路的驱动脉冲信号的驱动频率的扫描方向,以将驱动脉冲信号提供给升压电路。 输入电压检测和比较电路可以将第一和第二电压提供给电流电压转换电路,而不是参考电压产生电路。 在这种情况下,参考电压产生电路产生一个参考电压给主电压比较电路。
    • 4. 发明授权
    • Method and apparatus for driving piezoelectric transformer
    • 驱动压电变压器的方法和装置
    • US5923542A
    • 1999-07-13
    • US170761
    • 1998-10-13
    • Hiroshi SasakiKouichi Iguchi
    • Hiroshi SasakiKouichi Iguchi
    • G02F1/133H01L41/04H01L41/107H02M3/24H02M7/48H05B41/24H02M3/335H01L41/08
    • H01L41/044H02M7/48
    • A combination of two control methods are used, one of which is a method to control the boosting ratio of the piezoelectric transformer and another is a method to control the driving waveform of the piezoelectric transformer. The threshold values for switching the control methods are set with a hysteresis characteristic in order to avoid instability in the driving frequency at the time of switching and also to avoid driving at a natural frequency. When the source voltage is fixed, the driving frequency is increased by changing the resistance of the detection resistor 16 until the driving frequency reaches the natural frequency causing problems. When the driving frequency reaches the natural frequency, the power supply to the driving circuit is reduced to reduce the amplitude of the driving wave for reducing the driving frequency without changing the output voltage. At this state when the amplitude is small, the minimum output voltage is obtained by increasing the driving frequency to the natural frequency. This method and apparatus provide a wider range of output voltages and reliable output characteristics of the piezoelectric transformer.
    • 使用两种控制方法的组合,其中之一是控制压电变压器的升压比的方法,另一种是控制压电变压器的驱动波形的方法。 用于切换控制方法的阈值被设置为具有滞后特性,以避免在切换时的驱动频率中的不稳定性,并且也避免了以固有频率的驱动。 当源电压固定时,通过改变检测电阻16的电阻直到驱动频率达到固有频率而引起问题,从而增加驱动频率。 当驱动频率达到固有频率时,降低驱动电路的电源以减小用于降低驱动频率而不改变输出电压的驱动波的幅度。 在振幅较小的状态下,通过将驱动频率提高到固有频率来获得最小输出电压。 该方法和装置提供了更宽的输出电压范围和压电变压器的可靠的输出特性。
    • 7. 发明授权
    • Endoscope system, imaging apparatus, and control method
    • 内窥镜系统,成像装置和控制方法
    • US08723937B2
    • 2014-05-13
    • US13049055
    • 2011-03-16
    • Hiroshi Sasaki
    • Hiroshi Sasaki
    • H04N7/18A62B1/04
    • A61B1/00096A61B1/00009A61B1/00188A61B1/05G02B23/2407
    • An endoscope system includes an imaging section that includes an optical system and an imaging element, an observation mode setting section that sets an object observation mode, a diaphragm control section that selects a diaphragm state based on the observation mode, and an image processing section that processes an image acquired by the imaging section. The diaphragm control section selecting a first diaphragm state when the observation mode is a first observation mode. The first diaphragm state being a state in which a resolution determined by a diffraction limit based on a diaphragm of the optical system is lower than a resolution determined by the imaging element. The diaphragm control section selecting a second diaphragm state when the observation mode is a second observation mode. The second diaphragm state being a state in which the resolution determined by the diffraction limit based on the diaphragm of the optical system is equal to or higher than the resolution determined by the imaging element.
    • 一种内窥镜系统,包括:摄像部,其具备光学系统和摄像元件,设定被摄体观察模式的观察模式设定部,基于观察模式选择光阑状态的光圈控制部;以及图像处理部, 处理由成像部获取的图像。 当观察模式是第一观察模式时,光圈控制部分选择第一光阑状态。 第一光阑状态是其中由基于光学系统的光阑的衍射极限决定的分辨率低于由成像元件确定的分辨率的状态。 当观察模式是第二观察模式时,光圈控制部分选择第二光阑状态。 第二光阑状态是基于光学系统的光阑的由衍射极限决定的分辨率等于或高于由成像元件确定的分辨率的状态。
    • 9. 发明申请
    • CALCULATING DEVICE AND FLOW METER EQUIPPED WITH CALCULATING DEVICE
    • 计算装置和流量计与计算装置配套
    • US20110218742A1
    • 2011-09-08
    • US12943276
    • 2010-11-10
    • Hiroshi Sasaki
    • Hiroshi Sasaki
    • G06F19/00G01F1/00
    • G01F1/00G06F19/00
    • The calculating device has first and second Fourier transform portions performing Fourier transforms on two respective inputted signals; a complex conjugate deriving portion deriving a complex conjugate of a value outputted from the first Fourier transform portion; a multiplier multiplying the complex conjugate with the value outputted from the second Fourier transform portion, and outputting the value after the multiplication; a Hilbert transform portion performing a Hilbert transform on the value after multiplication; first and second inverse Fourier transform portions performing respective inverse Fourier transforms on the value after multiplication and the value outputted from the Hilbert transform portion; a phase relationship deriving portion deriving a phase relationship between the two inputted signals based on the values outputted from the first and second inverse Fourier transform portions; and a time difference deriving portion deriving a time difference between the two inputted signals based on the phase relationship.
    • 计算装置具有对两个相应的输入信号进行傅立叶变换的第一和第二傅里叶变换部分; 导出从第一傅里叶变换部分输出的值的复共轭的复共轭导出部分; 乘法器,将复共轭与从第二傅立叶变换部分输出的值相乘,并输出乘法后的值; Hilbert变换部分对乘法后的值执行希尔伯特变换; 第一和第二逆傅里叶变换部分对乘法后的值执行各自的傅立叶逆变换和从希尔伯特变换部分输出的值; 相位关系导出部,基于从第一和第二傅里叶逆变换部输出的值,导出两个输入信号之间的相位关系; 以及基于相位关系导出两个输入信号之间的时间差的时差导出部分。