Patent ID: 8861238
Filing Date: 2014-10-14
Classification: H02M

Abstract:
1. An alternating current-to-direct current (AC-DC) converter comprising: a transformer having a primary side and a secondary side; a first bi-directional switch and a first inductor connected in series between a positive terminal of an AC source and a first terminal of the primary side of the transformer; a second bi-directional switch and a second inductor connected between the positive terminal of the AC source and a second terminal of the primary side of the transformer and connected in parallel with the first bi-directional switch; a first active switch connected between a first terminal of the secondary side of the transformer and a first terminal of a DC load; a second active switch connected between the first terminal of the secondary side of the transformer and a second terminal of the DC load; a third active switch connected between a second terminal of the secondary side of the transformer and the first terminal of the DC load; and a fourth active switch connected between second terminal of the secondary side of the transformer and the second terminal of the DC load, and wherein the third and fourth active switches are configured to alternatively turn on and off in a first predetermined sequence to regulate one of current and voltage on the primary side of the transformer, wherein the first and second bi-directional switches are configured to alternatively turn on and off in a second predetermined sequence, wherein when the third active switch is turned on, one of the first active switch and the second active switch is turned on, and one of the first bi-directional switch and second bi-directional switch is turned on, allowing a first current flow through one of the first inductor and second inductor, and wherein when the fourth active switch is turned on, one of the first active switch and the second active switch is turned on, and one of the first bi-directional switch and second bi-directional switch is turned on, allowing a second current flow through one of the first inductor and second inductor.