Synchronous sampling of PWM waveforms
    8.
    发明授权
    Synchronous sampling of PWM waveforms 有权
    PWM波形同步采样

    公开(公告)号:US08072180B1

    公开(公告)日:2011-12-06

    申请号:US10308887

    申请日:2002-12-03

    IPC分类号: H02P27/04 H02P25/00

    摘要: A device for filtering a carrier frequency of a PWM waveform. The device includes a low-pass filter for converting the PWM waveform into an analog signal. The device further includes a sampling analog-to-digital converter receiving the analog signal from the low-pass filter and the device also includes a controller for causing the non-integrating analog to digital converter to sample the PWM waveform at the pulse frequency rate thereby rejecting the carrier frequency. As already stated the PWM waveform includes a pulse which has a leading edge, a top portion, and a trailing edge. In one embodiment, the controller causes the A/D converter to sample during the top of the pulse. Preferably, the controller causes the A/D converter to sample at substantially the center of the pulse.

    摘要翻译: 用于滤波PWM波形载波频率的装置。 该器件包括用于将PWM波形转换为模拟信号的低通滤波器。 该装置还包括从低通滤波器接收模拟信号的采样模数转换器,并且该装置还包括用于使非积分模数转换器以脉冲频率速率采样PWM波形的控制器,由此 拒绝载波频率。 如已经说明的那样,PWM波形包括具有前沿,顶部和后沿的脉冲。 在一个实施例中,控制器使得A / D转换器在脉冲的顶部采样。 优选地,控制器使得A / D转换器基本上在脉冲的中心处采样。