Patent ID: 6052292
Filing Date: 2000-04-18
Classification: H02M

Abstract:
An inverter having an input stage and first and second outputs and being responsive to signals generated by an external gating circuit, said input stage receiving excitation having a fixed, variable or selectable frequency and said inverter providing different levels of power separately to each of said first and second outputs dependent upon the frequency of said received excitation, said inverter comprising:a first rectifier having an input and an output and having switches arranged in a first configuration and being responsive to said signals of said external gating circuit, said input of said first rectifier having first and second ends and arranged to receive said variable frequency excitation and said output of said first rectifier having first and second ends and providing a first DC output;a transformer-inductor (T1-L1) element having a primary winding and a secondary winding and a magnetic core having a selectable amount of magnetic material, said primary and secondary windings having first and second ends and with the first end of said primary winding connected to said first end of said output of said first rectifier;a second rectifier having an input and an output and having switches arranged in a second configuration so as to provide a symmetrical operation between said first and second rectifiers, said switches of said second rectifier being responsive to said signals of said external gating circuit, said input of said second rectifier having first and second ends and having its first end connected to said second end of said primary winding, said output of said second rectifier having first and second ends and arranged to provide a first AC output; anda third rectifier having an input and an output and having switches arranged in a configuration identical to said first and second configurations so as to provide symmetrical operation between said first, second and third rectifiers, said switches of said third rectifier being responsive to said signals of said external gating circuit, said input and said output of said third rectifier each having first and second ends and said input of said third rectifier arranged to be connected across said first and second ends of said secondary winding.