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    • 23. 发明申请
    • METHOD AND APPARATUS FOR IMPROVING LIGHT LOAD EFFICIENCY IN SWITCHING POWER SUPPLIES
    • 改善开关电源轻负载效率的方法和装置
    • US20080042709A1
    • 2008-02-21
    • US11743468
    • 2007-05-02
    • Rengang ChenJames Brown
    • Rengang ChenJames Brown
    • H03K3/017
    • H02M3/156H02M2001/0032Y02B70/16
    • A circuit for transitioning between a discontinuous and a fixed frequency continuous conduction mode (DCM) and (CCM) of a power converter having a driver receiving PWM signals and controlling a switching stage comprises a control switch and a sync switch connected at a common switching node for driving a load. The circuit including a PWM modulator for providing PWM signals; and a mode selector for receiving a duty cycle value, a preset switching period, and a duty cycle at a critical conduction point having a switching frequency equal to the preset switching period and providing an on-time of the control switch and a switching period to the PWM modulator, wherein if the duty cycle value is greater than the duty cycle at a critical conduction point, the PWM modulator will drive will provide the PWM signals to operate the switching stage in the CCM with constant-frequency duty cycle control, and if the duty cycle value is less than duty cycle at a critical conduction point, the PWM modulator will drive will provide the PWM signals to operate the switching stage in the DCM by turning off the sync switch when a load current becomes negative.
    • 用于在具有接收PWM信号并控制切换级的驱动器的功率转换器的不连续和固定频率连续传导模式(DCM)和(CCM)之间转换的电路包括控制开关和在公共交换节点处连接的同步开关 用于驱动负载。 该电路包括用于提供PWM信号的PWM调制器; 以及模式选择器,用于在具有等于预设开关周期的开关频率的临界导通点处接收占空比值,预设开关周期和占空比,并且提供控制开关的导通时间和开关周期 PWM调制器,其中如果占空比值大于临界导通点的占空比,则PWM调制器将驱动将提供PWM信号以恒定频率占空比控制在CCM中操作开关级,并且如果 占空比值小于临界导通点的占空比,当负载电流变为负时,PWM调制器驱动将通过关闭同步开关来提供PWM信号来操作DCM中的开关级。
    • 27. 发明授权
    • Surgical scrub brush
    • 手术洗刷刷
    • US5035468A
    • 1991-07-30
    • US522677
    • 1990-05-11
    • James BrownJack W. Kaufman
    • James BrownJack W. Kaufman
    • A46B11/00A46B15/00A47K7/02A47L13/16A61B19/00
    • A47K7/02A46B11/001A46B15/00A61B90/80
    • This application discloses a method for assembling a scrub brush having a plurality of bristles integrally on one side of a thermoplastic backing and an open-cell organic sponge bonded to the other side of the backing by carrying out successively the following steps:a) forming the thermoplastic brush and bristles;b) melting a plurality of protrusions on the side of the backing away from the bristles with applied heat;c) placing the sponge on the molten protrusions; andd) maintaining contact between the molten protrusions and the sponge;whereby the molten protrusions are drawn by capillarity into the stroma network of the sponge.
    • 本申请公开了一种通过依次执行以下步骤来组装具有多个刷毛的刷毛的方法,所述刷毛具有多个刷毛,所述刷毛整体地位于热塑性背衬的一侧上,并且通过连续地连接到所述背衬的另一侧而开放的开孔细胞有机海绵:a) 热塑刷和刷毛; b)利用加热使背衬远离刷毛的多个凸起熔化; c)将海绵放置在熔融的突起上; 和d)保持熔融突起和海绵之间的接触; 由此熔融的突起物通过毛细管吸引到海绵的基质网络中。