Patent ID: 8907654
Filing Date: 2014-12-09
Classification: H02M

Abstract:
1. Power supply device for a main circuit of an electronic equipment, comprising: a current transformer with secondary windings connected in series; a winding selector configured to select one or more of the secondary windings to output a current in response to a state signal indicating a working state of the electronic equipment; and a storage capacitor configured to be charged by the current output by the selected secondary windings to supply power for the main circuit, wherein the winding selector is configured to select a first number of the secondary windings to output the current in response to a first state signal indicating a start state of the electronic equipment, and wherein the winding selector is configured to select a second number of the secondary windings to output the current in response to a second state signal indicating a normal operation state of the electronic equipment, the first number being less than the second number.