Patent ID: 8558494
Filing Date: 2013-10-15
Classification: H02M,H02P

Abstract:
1. A driving device to be electrically connected with an AC power and a brushless DC motor, the driving device comprising: a rectifier unit for receiving and rectifying the AC power; a filter unit, which is electrically connected with the rectifier unit and for filtering the rectified AC power to generate a DC power; a switch power conversion unit, which is electrically connected with the filter unit and the brushless DC motor and receives the DC power and outputs a driving power to the brushless DC motor, wherein the switch power conversion unit comprises a boost converter; and a control unit electrically connected with the switch power conversion unit and the brushless DC motor, wherein the boost converter comprises: a switch element; an inductor having one terminal for receiving the DC power and the other terminal electrically connected with the switch element; a rectifier element having a first terminal electrically connected with the other terminal of the inductor and the switch element, and the second terminal electrically connected with the brushless DC motor; a capacitor having one terminal electrically connected with the second terminal of the rectifier element and the brushless DC motor, and the other terminal grounded; an output voltage detecting element, which is electrically connected with the second terminal of the rectifier element, the other terminal of the capacitor and the brushless DC motor, and outputs a detection signal according to the driving power; a PWM control element, which is electrically connected with the switch element and the output voltage detecting element, and adjusts a duty cycle of the switch element according to the detection signal; and a auxiliary power, which is electrically connected with the PWM control element and provides an auxiliary voltage to the PWM control element.