Patent ID: 6519164
Filing Date: 2003-02-11
Classification: H02M,H03K,Y02B

Abstract:
A forward converter comprising:a rectifier circuit for rectifying an AC input voltage and thereby providing an unregulated DC voltage; an input inductor connected to said rectifier circuit to receive the unregulated DC voltage and provide a filtered unregulated DC input voltage; a switching element connected to said inductor, and adapted to be switched on and off in response to a switching control signal; an isolation transformer having a first primary winding and a second primary winding for receiving said filtered unregulated DC voltage through said first and second primary winding when said switching element is switched off and for inducing said filtered unregulated DC voltage to a secondary winding when said switching element is switched on, said first and second primary windings accumulate said filtered unregulated DC voltage which is induced to said secondary winding when said switching element is switched on; a first DC bus capacitor connected to the inductor, said first DC bus capacitor further connected to said switching element and adapted to recover energy from said isolation transformer, said first DC bus capacitor further adapted to limit the voltage on said switching element; and a diode connected to said first DC bus capacitor; and a second DC bus capacitor connected to said diode, and adapted to recover energy from said isolation transformer, said second DC bus capacitor further adapted to limit the voltage on said switching element.