Patent ID: 8008809
Filing Date: 2011-08-30
Classification: H02J,H02M

Abstract:
1. A DC/DC converter for use with a battery, the DC/DC converter comprising: first and second battery nodes configured to be coupled to the battery; first, second, third, and fourth bus nodes; first and second switches coupled in series between the first and second bus nodes wherein the first switch is coupled to the first bus node and the second switch is coupled to the second bus node; a first buck-boost converter coupled to a junction of the first and second switches, to a neutral, and to the first battery node; third and fourth switches coupled in series between the third and fourth bus nodes wherein the third switch is coupled to the third bus node and the fourth switch is coupled to the fourth bus node; a second buck-boost converter coupled to a junction of the third and fourth switches, to the neutral, and to the second battery node; a first diode coupled across the first switch; a second diode coupled across the second switch; a third diode coupled across the third switch; a fourth diode coupled across the fourth switch; a first capacitor coupled between the first and second bus nodes; a second capacitor coupled between the second bus node and the neutral; a third capacitor coupled between the neutral node and the third bus node; and a fourth capacitor coupled between the third and fourth bus nodes, wherein the DC/DC converter is configured to operate in a first state to charge the battery using energy conveyed by at least one of the first, second, third, and fourth bus nodes; and wherein the DC/DC converter is configured to operate in a second state to convey a DC voltage to at least one of the first, second, third, and fourth bus nodes using energy conveyed by the battery.