发明名称 |
Control of current in an inductance with pulse width modulation at controlled frequency |
摘要 |
<p>A PWM controller for a bridge driver circuit for controlling current in an inductive load such as a motor, can set the driver into a forward mode, a slow decay mode or a fast decay mode, and can switch from slow decay mode into forward mode or into fast decay mode for the duration of pulses at controlled time intervals to provide pulse width modulated control of the current. This is a simpler control scheme avoiding complex switching schemes related to mixed mode decay. By using a controlled PWM frequency, it is easier to avoid the problems of variable frequency such as increased heat dissipation or acoustic noise generation. It can have a selector for selecting top or bottom sense switching, enabling a wider range of stable PWM duty-cycles to be used (e.g. 0% to 100%), which is useful to compensate for Back emf influence on coil-drive.</p> |
申请公布号 |
EP1503492(A2) |
申请公布日期 |
2005.02.02 |
申请号 |
EP20040077147 |
申请日期 |
2004.07.26 |
申请人 |
AMI SEMICONDUCTOR BELGIUM BVBA |
发明人 |
DE COCK, BART;PLOJHAR, JAN |
分类号 |
H02M7/538;H02M1/00;H02M7/521;H03B1/00;(IPC1-7):H02M7/521 |
主分类号 |
H02M7/538 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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