| 摘要 |
<p>A heating device has PTC heating thermistors (10) connected in groups, and a circuit for selectively turning on one or more groups (1,2,3,4). At least two of the groups have different rated heating powers. The circuit turns on the selection of the groups at least on the basis of the available electrical power. A method for electrically heating a vehicle is also disclosed. <IMAGE></p> |
