| 摘要 |
PROBLEM TO BE SOLVED: To provide a circuit device for actuating a PTC electric heating element used as a heater element which is advantageously feasible in price and has a high safety, and in which a rapid reach to a prescribed temperature of the heated device is enabled. SOLUTION: In the circuit device for actuating the PTC electric heating element (10), it is used as the heater element that is connected to a fuse (11) in series. Then, a pulse width modulator (16) is installed which completely turns the PTC electric heating element (10) ON or OFF by time controlled actuation having a prescribed pulse-duration time (ti1, ti2) and/or a prescribed cycle time (tp1, tp2). The pulse-duration time and/or the cycle time is determined so that at least a scale (1) for an effective value (Ieff) of a current (I) flowing in the PTC electric heating element (10) is always on a lower side of the fusion integration (2) of the fuse (11). COPYRIGHT: (C)2007,JPO&INPIT
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