| 摘要 |
The invention relates to a control device (1) for controlling the current conduction angle of a current (I) flowing through a load (4). The inventive control device comprises two antiserially connected controllable semiconductor switches (2, 3) such as MOSFET's, to whose contact gaps a diode (19, 20) is antiparallelly connected. The control device also comprises a control unit (7) which is connected to the control inputs of the semiconductor switches (2, 3) in order to provide independent control of the semiconductor switches (2, 3) for a generalized phase control or section phase control of the load current (I). In order to activate the load current (I) during passage though zero in the instance of section phase control, the control unit (7) connected to the respective semiconductor switch (2, 3) already progresses a predetermined duration before passage though zero via the control input of said semiconductor switch. When, in the instance of generalized phase control, the load current (I) is deactivated during passage though zero, the control unit first stops a predetermined duration after passage though zero via the control input of said semiconductor switch, and the diode (20, 19) which is antiparallelly connected to the other semiconductor switch (3, 2) effects the respective switching of the current exactly during passage though zero. |
