CELLULOSE NANOFIBER, SHEET-LIKE MATERIAL OBTAINED THEREFROM, AND METHOD FOR PRODUCING CELLULOSE NANOFIBER AND SHEET-LIKE MATERIAL

    公开(公告)号:US20200224365A1

    公开(公告)日:2020-07-16

    申请号:US16649108

    申请日:2018-03-12

    Inventor: Taro KINUMOTO

    Abstract: The present invention provides: a cellulose nanofiber enabling the provision of a high-performance sheet-like material; a method for producing the cellulose nanofiber; and a sheet-like material obtained from the cellulose nanofiber. A bamboo-derived cellulose nanofiber having a cellulose purity of at least 90%, a fiber diameter of 10-20 nm, and a crystallinity of at least 70% can be obtained by a method comprising: (1) a step for subjecting a bamboo material to an alkali treatment and a mechanical treatment to prepare bamboo fibers; (2) a step for delignificating the obtained bamboo fibers; (3) a step for mechanically spreading the delignificated bamboo fibers; (4) a step for removing hemicellulose from the spread bamboo fibers; and (5) a step for removing metal components from the bamboo fibers from which hemicellulose has been removed. A high strength sheet material having a tensile strength of 7-200 N for a basis weight of 10-210 g/m2 or a high strength sheet material having a tensile strength of 7-200 N for a density of 0.3-1.1 g/cm3 can be obtained by making this cellulose nanofiber into a sheet.

    SWITCHING POWER SUPPLY DEVICE AND PULSE WIDTH MODULATION CIRCUIT USED THEREIN
    36.
    发明申请
    SWITCHING POWER SUPPLY DEVICE AND PULSE WIDTH MODULATION CIRCUIT USED THEREIN 有权
    切换电源设备和脉冲宽度调制电路

    公开(公告)号:US20150022165A1

    公开(公告)日:2015-01-22

    申请号:US14372241

    申请日:2012-07-19

    Inventor: Terukazu Sato

    CPC classification number: H03K3/017 H02M3/156 H02M3/158 H02M2001/0025

    Abstract: A problem of the present invention is to provide a switching power supply device and a pulse width modulation circuit capable of operating stably in synchronization with a clock signal. To solve the problem, a pulse width modulation circuit 3A in a switching power supply device 1A includes square-wave voltage output means 8A for, when an integrated voltage Vn rises to an upper threshold voltage or more, shifting a square-wave voltage VPWM to L level, or when the voltage Vn drops to a lower threshold voltage or less, shifting the voltage VPWM to H level, and clock means 6A for outputting a first clock signal VCL1 and a second clock signal VCL2, which are 180° out of phase from each other. The square-wave voltage output means 8A is adapted to: (1) if the clock signal VCL1 changes while the voltage Vn is dropping, shift the voltage VPWM to H level even when the voltage Vn has not yet reached the lower threshold voltage; and (2) if the clock signal VCL2 changes while the voltage Vn is rising, shift the voltage VPWM to L level even when the voltage Vn has not yet reached the upper threshold voltage.

    Abstract translation: 本发明的问题是提供一种与时钟信号同步地稳定地工作的开关电源装置和脉宽调制电路。 为了解决这个问题,开关电源装置1A中的脉冲宽度调制电路3A包括方波电压输出装置8A,当积分电压Vn上升到上限阈值以上时,将方波电压VPWM变换为 L电平,或者当电压Vn下降到较低的阈值电压或更小时,将电压VPWM移位到H电平;以及时钟装置6A,用于输出相位为180°的第一时钟信号VCL1和第二时钟信号VCL2 从彼此。 方波电压输出装置8A适于:(1)如果在电压Vn下降时时钟信号VCL1变化,即使电压Vn尚未达到较低的阈值电压,也将电压VPWM移动到H电平; 和(2)如果时钟信号VCL2在电压Vn升高时变化,即使当电压Vn尚未达到上限阈值电压时,也将电压VPWM移动到L电平。

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