公开(公告)号：US09584043B2

公开(公告)日：2017-02-28

申请号：US14634737

申请日：2015-02-28

Applicant: Rockwell Automation Technologies, Inc.

Inventor： Zhendong Zhang ,  Takayoshi Matsuo ,  David Leggate ,  Timothy M. Rowan ,  Russel J. Kerkman ,  Bing Li

IPC: H02M7/48 ,  H02M7/5387 ,  H02M1/00

CPC classification number: H02M7/48 ,  H02M7/53871 ,  H02M7/5395 ,  H02M2001/0009

Abstract: Methods and apparatus are presented for sampling low side inverter phase currents, in which current sampling is selectively delayed in a given PWM cycle by a non-zero sampling delay time value from a nominal sample time if the middle pulse width value is less than a non-zero first threshold to facilitate adequate signal settling for accurate current measurement, and if a middle total continuous on-time near the end of the given PWM cycle is less than a non-zero second threshold, the middle total continuous on-time is selectively extended by adding a non-zero adjustment offset time value to a middle pulse width value for a next PWM cycle.

Abstract translation: 提出了用于采样低侧逆变器相电流的方法和装置，其中如果中间脉冲宽度值小于非正常采样时间，则在给定PWM周期中电流采样被选择性地从标称采样时间的非零采样延迟时间值延迟 为了促进适当的信号稳定以便精确的电流测量，并且如果在给定的PWM周期结束附近的中间总连续导通时间小于非零第二阈值，则中间的总连续导通时间是选择性的 通过向下一个PWM周期的中间脉冲宽度值添加非零调整偏移时间值来扩展。