Abstract: A power supply device is disclosed for use in electronic equipment. In an embodiment, the power supply device includes: a current transformer with N secondary winding parts connected in series, an energy storage capacitor and a winding selector, in which N is an integral number and N?2, wherein the winding selector selectively enables one or more serially connected winding parts of the N secondary winding parts to output an electrical current, in response to a state signal indicating the operating state of the electronic equipment; and the energy storage capacitor is charged by the output current, and supplies power to a main circuit of the electronic equipment. In the embodiments of the present invention, there is also provided corresponding electronic equipment and a corresponding method. By way of the embodiments of the present invention, it is possible to supply electrical energy at relatively low power loss.

Abstract: A power supply device is disclosed for use in electronic equipment. In an embodiment, the power supply device includes: a current transformer with N secondary winding parts connected in series, an energy storage capacitor and a winding selector, in which N is an integral number and N?2, wherein the winding selector selectively enables one or more serially connected winding parts of the N secondary winding parts to output an electrical current, in response to a state signal indicating the operating state of the electronic equipment; and the energy storage capacitor is charged by the output current, and supplies power to a main circuit of the electronic equipment. In the embodiments of the present invention, there is also provided corresponding electronic equipment and a corresponding method. By way of the embodiments of the present invention, it is possible to supply electrical energy at relatively low power loss.