and 408 are the active power switches for the synchronous boost converter the primary winding of 401 is connected across synchronous rectifier 407 similarly for the boost converter with non synchronous boost rectifier the primary winding of 401 is also connected across 407 which in this case is a rectifier diode the switching voltage across the secondary winding of 401 is rectified by 402 403 which is the output of the rectifier 402 supplies power to the supply input to 205 any arbitrary number of secondary windings can be implemented in the transformer 401 which combined with rectifiers analogous to 402 and filter capacitors not shown for simplicity can generate multiple dc voltages operation with the boost converter fig4 a and fig4 b i fig4 a operation with synchronous boost converter 405 and 406 denote the input and output power nodes respectively of the synchronous boost converter when the switching mosfet 408 switches on the voltage across the synchronous rectifier 407 equals the boost regulator 39 s output voltage voltage at 406 since the primary of the transformer 401 is connected across 407 the voltage across the primary winding also equals the boost output voltage then the voltage across the secondary winding of 401 equals the boost regulator 39 s output voltage multiplied by the secondary to primary turns ratio this voltage is regulated if the boost regulator 39 s output voltage is regulated ii fig4 b operation with boost converter with non synchronous boost rectifier diode 405 and 406 denote the input and output power nodes respectively of the non synchronous boost converter when the switching mosfet 408 switches on the voltage across the non synchronous boost rectifier 407 equals the boost regulator.