Patent ID: 9065372
Filing Date: 2015-06-23
Classification: H02M,H02P

Abstract:
1. A multi-driving device, comprising: a first driving device comprising n inductors, wherein n is a positive integer equal to or larger than 3; a second driving device; and a driving circuit coupled to the first driving device and the second driving device and comprising n switch groups coupled in parallel, wherein each switch group comprises a first switch, a second switch, a third switch and a fourth switch, the first switch and the second switch are coupled in series, the third switch is serially coupled to the fourth switch and coupled between the first switch and the second switch, an i wherein, in a low speed mode, each first switch and each second switch are turned on; in a high speed mode, the first switch and the third switch of a first one of the n switch groups are turned on, the second switch and the fourth switch of the first one of the n switch groups are turned off, the first switch and the third switch of a second one of the n switch groups are turned off, the second switch of the second one of the n switch groups is turned on, and the fourth switch of the second one of the n switch groups is selectively turned on or off so as to raise the voltage of the second driving device.