| 摘要 |
A battery charging system for a road vehicle has a wound field alternator charging the battery and a voltage regulator controlling current flow in the field winding of the alternator. In order to protect against faults in the system, a first freewheel path is connected across the field winding to dissipate energy stored in the field winding in normal use. If the alternator output rises too much, this first freewheel path is disconnected, and is replaced by a second freewheel path of substantially greater dissipation, so that the energy in the field winding is dissipated rapidly.
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