| 摘要 |
The invention relates to a method for controlling two electrically series-connected reverse conductive IGBTs (T1, T2) of a half bridge (2) on which an operating DC voltage (UG) is present, wherein said reverse conductive IGBTs (T1, T2) have three switching states. According to the invention, the method comprises the following steps: setting each reverse conductive IGBT (T1, T2) of the half bridge (2) to the "-15V" switching state during a steady OFF state of an associated target control signal (S* T ); maintaining a reverse conductive IGBT (T1, T2) in the "+15V" switching state after a predetermined time period (??1) has lapsed after the target control signal (S* T ) has changed from the OFF state to an ON state as long as a current flows from the emitter to the collector; setting a reverse conductive IGBT (T1, T2) after said predetermined time period (??1) has lapsed after the target control signal (S* T ) has changed from the OFF state to an ON state if a flow of current is thereby made possible from the collector to the emitter; setting each reverse conductive IGBT (T1, T2) of the half bridge (2) to the "+15V" switching state for a second predetermined time period (??2) after the associated target control signal (ST) has switched from the ON to the OFF state; and setting the reverse conductive IGBT (T1, T2) of the half bridge (2) to the "0V" switching state for a third predetermined time period (??3) after the second time period (??2) has lapsed. This creates a control method for two electrically series-connected RC-IGBTs (T1, T2) of a half bridge (2) which have three switching states, whereby the reverse recovery charge is lower than in a conventional control method, with the forward voltage remaining the same. |
