Patent ID: 7750503
Filing Date: 2010-07-06
Classification: H02J,H02M

Abstract:
1. A direct current stabilizing power source apparatus comprising: a transformer having first and second primary windings and first and second secondary windings; a first self-excitation oscillation type switching means connected to said first primary winding; a main electric power supplying circuit that connects a main power source to said first primary winding via said first switching means; a second self-excitation oscillation type switching means connected to said second primary winding; a backup electric power supplying circuit that connects a backup power source to said second primary winding via said second switching means; and a first output circuit that converts an alternating electric current appearing on said first secondary winding into direct electric current for output, a second output circuit that outputs an alternating electric current appearing on said second secondary winding to said backup electric power supplying circuit as a power source for charging a battery which is the backup power source, wherein said main electric power supplying circuit includes a backup stopping circuit that outputs a signal for stopping an operation of said second switching means when a voltage of a main electric power that is input into the main electric power supplying circuit is larger than or equal to a predetermined value, and the backup stopping circuit is disposed with isolation from the second switching means.