In order to provide an interface circuit, a power converter using the same and an electric vehicle using the same, wherein this interface circuit ensures improved control reliability without employing a photo-coupler, an interface circuit 100A transfers control signals to the power transistor in a large-current circuit 300 from a small-signal circuit 200 for driving a power transistor. The shielding elements comprise a magnetic material having a saturation less than or equal to 20,000 gauss. A shift merge operation is performed to merge the unprocessed data bits from the first data block with a second data block. Examples of such first and second types include cellular links and data networking links. In response to determining that the system is operating in an overloaded state, it may be configured to throttle at least a portion of incoming service requests in an attempt to exit the overloaded state. According to the invention, the rolling bearing includes a measurement ring having the dimensional scale and is fixed to the inner bearing ring or the outer bearing ring.