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    • 7. 发明授权
    • Electric power converter with continuous stable noise reduction
    • 电力转换器具有连续稳定的降噪功能
    • US06600295B2
    • 2003-07-29
    • US09943386
    • 2001-08-31
    • Nobuyasu KanekawaKohei SakuraiKenji TabuchiMitsuru WatabeShoji Sasaki
    • Nobuyasu KanekawaKohei SakuraiKenji TabuchiMitsuru WatabeShoji Sasaki
    • G05F110
    • H02M3/156
    • In order to ensures a stable reduction of noise level at all times, in the steps of switching input voltage with a switching element 10, smoothing the voltage of rectangular wave obtained by switching with a reactor L and capacitor Cf and outputting it, the voltage obtained by dividing the output voltage is compared with the sawtooth wave output from a sawtooth wave generator 14 by a comparator 12. When the switching signal in response to the result of this comparison is applied to the switching element 10, the counter 16 is actuated synchronously with the vertex of the sawtooth wave to perform opening/closing operation of the switch SW1. The time constant of the time constant circuit comprising a R0 and C is adjusted according to whether a resistor R1 is present or not, and the signals of frequencies f1 and f2 coming out of the sawtooth wave generator 14 are sequentially switched to be sent to the comparator 12. The peak of the switching noise is diffused in the frequency range by sequential selection of switching frequencies, and noise level is reduced by diffusion of noise energy.
    • 为了始终确保噪声电平的稳定降低,在利用开关元件10切换输入电压的步骤中,平滑通过用电抗器L和电容器Cf切换而获得的矩形波的电压并输出,获得的电压 通过将输出电压除以与比较器12的锯齿波发生器14输出的锯齿波进行比较,当将与该比较结果对应的切换信号应用于开关元件10时,计数器16与 锯齿波的顶点来执行开关SW1的打开/关闭操作。 根据是否存在电阻R1来调整包括R0和C的时间常数电路的时间常数,并且顺序地切换从锯齿波发生器14出来的频率f1和f2的信号被发送到 比较器12.开关噪声的峰值通过顺序选择开关频率而在频率范围内扩散,噪声电平通过噪声能量的扩散而减小。
    • 10. 发明授权
    • Graphics computer
    • 图形电脑
    • US5771047A
    • 1998-06-23
    • US355517
    • 1994-12-14
    • Mamoru OhbaMitsuru WatabeRika MinamiKoyo Katsura
    • Mamoru OhbaMitsuru WatabeRika MinamiKoyo Katsura
    • G06T11/20G06T11/00
    • G06T11/203
    • To reduce the hardware of the graphics computer in size and reduce the cost of the hardware, the frame buffer and the main memory are united into one unit to process graphics data in the CPU. The frame buffer is arranged in the main memory, and the graphics computer includes a DMAC used to read pixel data from the frame buffer for display, a display used to receive the pixel data and display it on a display device, such as an LCD, etc., and memories used to store the procedure used by the CPU to draw the pixel data in the said frame buffer. Especially, the said memories are formed so that a single function procedure and a multifunction procedure can be selected to suit the drawing object. In addition, the single function procedure includes a line drawing procedure that uses data tables and a multivalue expansion procedure that uses a pattern table and a mask table. Since the frame buffer and the main memory are united into one unit, the CPU can be used to process graphics data. Thus, the graphics computer hardware is reduced in size and the cost of the hardware is reduced.
    • 为了减小图形计算机的硬件尺寸并降低硬件成本,将帧缓冲器和主存储器联合成一个单元来处理CPU中的图形数据。 帧缓冲器布置在主存储器中,并且图形计算机包括用于从帧缓冲器读取像素数据以进行显示的DMAC,用于接收像素数据并将其显示在诸如LCD的显示设备上的显示器, 以及用于存储CPU使用的程序来绘制所述帧缓冲器中的像素数据的存储器。 特别地,所述存储器被形成为使得可以选择单个功能过程和多功能过程以适合绘图对象。 另外,单功能过程包括使用数据表的线条画过程和使用模式表和掩码表的多值扩展过程。 由于帧缓冲器和主存储器被组合成一个单元,所以CPU可以用于处理图形数据。 因此,图形计算机硬件的尺寸减小,硬件的成本降低。