Control method and control device

A control device, applied to a conversion circuit, comprising at least one bridge arm and an inductor, the bridge arm comprising an upper semiconductor switch and a lower semiconductor switch connected in series, and one end of the inductor being connected to a midpoint of the bridge arm, wherein the control device comprises:

• a current managing unit, configured to judge a direction of current of the inductor in the conversion circuit when a scram event occurs in the conversion circuit;
• a drive control unit, configured to turn on the upper semiconductor switch and turn off the lower semiconductor switch when the direction of current of the inductor is judged as a first direction, and turn off the upper semiconductor switch and turn on the lower semiconductor switch when the direction of current of the inductor is judged as a second direction;
• wherein the first direction is a forward conduction direction of the lower semiconductor switch, and the second direction is a forward conduction direction of the upper semiconductor switch.