| 发明名称 |
Back-EMF detection for motor control |
| 摘要 |
Systems, methods, and other embodiments associated with back-EMF detection for motor control are described. In an embodiment, an apparatus includes a drive circuit configured to apply excitation signals to respective inputs of a motor, a signal inhibit circuit configured to convey a signal to inhibit application of the excitation signals during an interval, and a measuring circuit configured to measure a back-electromotive force (EMF) signal crossing a reference signal during the interval. |
| 申请公布号 |
US8853985(B2) |
申请公布日期 |
2014.10.07 |
| 申请号 |
US201113223705 |
申请日期 |
2011.09.01 |
| 申请人 |
Marvell World Trade Ltd. |
发明人 |
Krishnamoorthy Ravishanker;Leong Foo Leng;Susanto Edy |
| 分类号 |
H02P1/00;H02P6/18 |
主分类号 |
H02P1/00 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. An apparatus, comprising:
a drive circuit configured to apply a plurality of excitation signals to respective inputs of a motor; a signal inhibit circuit configured to convey a signal to inhibit application of the plurality of excitation signals for an interval, wherein the plurality of excitation signals include three excitation signals, and wherein the signal inhibit circuit is configured to inhibit all three of the excitation signals simultaneously for a same duration that is the interval; and a measuring circuit configured to measure when a back-electromotive force (EMF) signal crosses a reference signal to determine a length of the interval, wherein the length of the interval is an amount of time for the back-electromotive force to decay to the reference voltage, and wherein the interval varies according to the back-electromotive force. |
| 地址 |
BB |
