They propose to address this with a buck regulator: > [If] we are to get rid of galvanic isolation [there's still a ] need to prevent mismatches between the ut

They propose to address this with a buck regulator: > [If] we are to get rid of galvanic isolation [there's still a ] need to prevent mismatches between the utility’s AC line voltage and that of the EV battery. > The solution to this problem is a device called a buck regulator (or buck converter). A buck regulator is similar, functionally, to a step-down transformer, except that it handles DC current rather than AC. In the event that the utility’s AC voltage exceeds the battery voltage, the buck regulator operates like a transformer and steps it down. In comparison with an isolation link of the same power rating, a buck regulator would cost less than 10 percent and the power loss would be less than 20 percent.