Patent ID: 7932636

Claim:
An automatic start-up circuit for use in an uninterruptible power supply apparatus, said uninterruptible power supply apparatus comprising an energy storage unit and a switching circuit, said automatic start-up circuit comprising: an operating status detecting circuit connected to an energy storage unit connecting node for detecting an operating status of said energy storage unit indicative of whether the energy storage unit is installed in the uninterruptible power supply apparatus or not through said energy storage unit connecting node, and generating an start-up control signal according to said operating status of said energy storage unit; and a secondary switch driving circuit connected to said operating status detecting circuit, a control terminal of said switching circuit and a common terminal for determining whether said switching circuit is to be driven to be conducted when said start-up signal indicates that the energy storage unit is installed in the uninterruptible power supply apparatus, thereby automatically starting up said uninterruptible power supply apparatus.