| 摘要 |
<p>A system (100) for controlling an electric motor (112), based on an N-MOS switching device (116), allowing operation in reverse battery polarity condition and protecting the switching device (116) against voltage peaks when in direct battery polarity condition. The system (100) includes a power source (114), a switching device (116) connected in series with the motor (112) to switch the same between the "on" and "off" states, a control device (118) to control the switching device (116), and a thyristor (124) connected in parallel with the motor (112), whereby the conducting and nonconducting states of the thyristor (124) are controlled by the control device (118). Also a method (200) is provided for controlling an electric motor (112), such as in a system (100) defined above, comprising the steps of switching a state of the thyristor (124) in direct battery polarity conditions such that the thyristor (124) conducts current (210) and switching the state of the thyristor (124) in reverse battery polarity conditions such that the thyristor (124) does not conduct (212).</p> |
