Patent ID: 6249444
Filing Date: 2001-06-19
Classification: H02M,Y02B

Abstract:
A forward converter, comprising:a power transformer having a primary winding connected in series between a positive input voltage supply line and a first node and a secondary winding connected in parallel across a second node and a third node;a power switch connected between the first node and a negative voltage supply line;a first rectifying device connected in series between the second node and a fourth node, and oriented to permit current flow in normal operation between the second node and the fourth node;a second rectify device connected in parallel across the fourth node and the third node, and oriented to permit current flow in normal operation between the third and fourth nodes;a first magnetic energy storage element connected in series between the fourth node and a first output node;a second output node connected to the third node;a switch connected in a series combination with a second magnetic energy storage element and a capacitive element, the series combination connected in parallel with the primary winding of the transformer; anda circuit for coupling magnetic energy stored in the power transformer to the capacitive element to control the charge level of said capacitive element, including a series combination of an auxiliary winding and a rectifying element, the series combination connected in parallel across the capacitive element.