Patent ID: 8705253

Claim:
A single-ended primary-inductance converter (SEPIC) controller configured for operation as a SEPIC power converter with an LC network including a transformer with a primary side coil and a secondary side coil, the LC network further including a primary side inductor, a primary side capacitor, and a primary side current limiting component, the SEPIC power converter operable to convert power from an input power source into a regulated output power supplied to a load, the SEPIC controller comprising: a transistor switch configured to couple between a switch node and a system return; the transformer configurable with a first end of the primary side coil coupled to the switch node; the LC network configurable with the primary side inductor coupled between the input power source and the current limiting component; the primary side current limiting component coupled between the primary side inductor and the switch node, and configured to enable current flow in a forward direction from the inductor to the switch node, and to block current flow in a reverse direction; the primary side capacitor coupled between a second end of the primary side coil and the system return, and configured to transfer energy to the secondary side coil of the transformer during valleys associated with a rectified input voltage; a controller configured to control the transistor to selectively connect the switch node to the system return, and thereby control current through the primary side coil to supply the regulated output power from the secondary side coil.