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    • 51. 发明授权
    • Step-up converter
    • 升压转换器
    • US07825646B2
    • 2010-11-02
    • US11905399
    • 2007-09-28
    • Takuya IshiiMikio MotomoriJunichi MoritaTakashi RyuMasaaki KotoMakoto IshimaruKazuhito KimuraSatoshi Wada
    • Takuya IshiiMikio MotomoriJunichi MoritaTakashi RyuMasaaki KotoMakoto IshimaruKazuhito KimuraSatoshi Wada
    • G05F1/40
    • H02M3/156
    • The present invention provides a current-mode control step-up converter capable of reducing the minimum duty ratio to a sufficiently small value and facilitating the setting of the maximum duty ratio. The step-up converter comprises a current detector 9 for generating a current detection signal Vc corresponding to the current of a rectifier 4; an error amplifier 8 for generating an error signal Ve corresponding to an output DC voltage Vo; and a control circuit 10 for turning ON/OFF the main switch 3 on the basis of the current detection signal Vc and the error signal Ve. The control circuit 10 comprises a comparator 11 and a timer circuit 12. With this configuration, the ON time of the main switch 3 is set at a predetermined value, and the valley value of an inductor current changing in a triangular waveform is controlled. Hence, the OFF time of the main switch is adjusted to stabilize the output. Since the ON time of the main switch 3 can be set as desired, the minimum duty ratio can be reduced to zero or a sufficiently small value.
    • 本发明提供了一种电流模式控制升压转换器,其能够将最小占空比降低到足够小的值,并且有助于设定最大占空比。 升压转换器包括用于产生与整流器4的电流相对应的电流检测信号Vc的电流检测器9; 用于产生对应于输出DC电压Vo的误差信号Ve的误差放大器8; 以及用于根据电流检测信号Vc和误差信号Ve导通/断开主开关3的控制电路10。 控制电路10包括比较器11和定时器电路12.通过这种配置,主开关3的接通时间被设定为预定值,并且控制以三角波形变化的电感器电流的谷值。 因此,主开关的断开时间被调节以稳定输出。 由于可以根据需要设定主开关3的导通时间,所以可以将最小占空比降低到零或足够小的值。
    • 54. 发明授权
    • Step-up power supply device
    • 升压电源装置
    • US07567069B2
    • 2009-07-28
    • US11898701
    • 2007-09-14
    • Takashi RyuTakuya IshiiMikio MotomoriKazuhito KimuraSatoshi WadaRumi Nakai
    • Takashi RyuTakuya IshiiMikio MotomoriKazuhito KimuraSatoshi WadaRumi Nakai
    • G05F1/40H02M3/18
    • H02M1/36Y10S323/901
    • A step-up power supply device includes: a step-up converter; a startup circuit which controls the on/off operation of a switch element of the step-up converter when an output voltage of the device is smaller than a reference voltage; and a control circuit which operates in substitution for the startup circuit when the output voltage is higher than the reference voltage to control the on/off operation of the switch element such that the output voltage reaches a target value. The startup circuit includes an oscillation circuit for generating a pulse signal which has a predetermined on/off ratio, a current comparison circuit for comparing a current of the switch element with a predetermined restriction value, and a drive circuit for generating a drive signal based on which the switch element is turned on/off, the drive signal being generated from the pulse signal to turn on the switch element, and the drive signal being generated from the output of the current comparison circuit or the pulse signal to turn off the switch element.
    • 升压电源装置包括:升压转换器; 启动电路,当所述器件的输出电压小于参考电压时,控制所述升压转换器的开关元件的接通/断开操作; 以及控制电路,其在输出电压高于基准电压时代替启动电路,以控制开关元件的导通/截止操作,使得输出电压达到目标值。 启动电路包括用于产生具有预定的导通/关断比的脉冲信号的振荡电路,用于将开关元件的电流与预定限制值进行比较的电流比较电路,以及用于产生基于 所述开关元件被接通/断开,所述驱动信号从所述脉冲信号产生,以接通所述开关元件,并且所述驱动信号是从所述当前比较电路的输出或所述脉冲信号产生的,以将所述开关元件 。
    • 56. 发明申请
    • INK JET PRINTING SYSTEM AND INK JET PRINTING METHOD
    • 喷墨打印系统和喷墨打印方法
    • US20090015611A1
    • 2009-01-15
    • US12167662
    • 2008-07-03
    • Takashi OchiaiHitoshi TsuboiSatoshi Wada
    • Takashi OchiaiHitoshi TsuboiSatoshi Wada
    • B41J29/38
    • B41J29/38B41J2/155B41J2/2146
    • An image data signal value conversion is performed such that the volume of ink applied to image areas on a print medium to be printed by the overlapping portions of the printing element substrates is smaller than that applied to image areas on the print medium to be printed by other than the overlapping portions. Alternatively, the image data signal value conversion is performed such that the volume of ink applied to overlapping areas on the print medium to be printed by two consecutive printing main scans is smaller than that applied to other than the overlapping areas. For this reason, even when forming photographic images by using an elongate “joining head”, high-quality images with no density unevenness between overlapping areas and other areas on a print medium can be produced. Also in a serial type printing apparatus, uniform images with no seam stripes can be produced.
    • 执行图像数据信号值转换,使得施加到要由打印元件基板的重叠部分打印的打印介质上的图像区域的墨的体积小于通过打印介质的打印介质上的图像区域施加的打印介质上的墨水量 而不是重叠部分。 或者,执行图像数据信号值转换,使得通过两次连续的打印主扫描施加到要打印的打印介质上的重叠区域的墨水的量小于应用于重叠区域之外的墨水的体积。 因此,即使通过使用细长的“接合头”形成摄影图像,也可以制造在重叠区域和打印介质上的其他区域之间没有浓度不均匀的高质量图像。 同样在串行式打印装置中,可以产生无缝条纹的均匀图像。