Abstract: A soft-switching power converter includes a main switch, an energy-releasing switch, and an inductive coupled unit. The main switch is a controllable switch. The energy-releasing switch is coupled to the main switch. The inductive coupled unit is coupled to the main switch and the energy-releasing switch. The inductive coupled unit includes a first inductance, a second inductance coupled to the first inductance, and an auxiliary switch unit. The auxiliary switch unit is coupled to the second inductance to form a closed loop. The main switch and the energy-releasing switch are alternately turned on and turned off. The auxiliary switch unit is controlled to start turning on before the main switch is turned on so as to provide at least one current path.

Abstract: A stirrer includes a rod for stirring a drink. a head secured onto the rod, a battery received in the head and having two electrodes. A light device has two prongs for coupling to the electrodes of the battery. One of the prongs may be selectively coupled to the battery and for selectively energizing the light device. The light emitted by the light device may be seen through the rod or the head. The head includes two casings secured together for retaining the battery or the light device within the head. The light device may be selectively actuated or energized by a switch.