| 摘要 |
A switching device and a method of operating a switching power element are disclosed for generating a train of drive pulses (D 1 to D 32 ) in a basic pattern for a repetition cycle time (T to TF) having leading time intervals (Th 1 to Th 3 , Th 1 ' to Th 3 '), associated with leading edges (a 1 to a 32 ) of the drive pulses, and trailing time intervals (Tl 1 to Tl 3 , Tl 1 ' to Tl 3 '), associated with trailing edges (b 1 to b 32 ) of the drive pulses, which are different from each other, whereby switching frequencies and associated harmonics, resulting from the leading edges and the trailing edges of the drive pulses, are diffused. A diffusion frequency, representing an inverse number of the repetition cycle time for the basic pattern is set to be higher than an audible frequency.
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