| 摘要 |
A circuit arrangement (100) and a method for the DC-isolated driving of a semiconductor switch (400) are presented, wherein the circuit arrangement has a control circuit (101), a driver circuit (102), a transformer (200) for the DC-isolated transfer of a drive signal from the control circuit (101) as switching signal into the driver circuit (102) and means for rectifying (301, 302) the switching signal, wherein the driver circuit (102) contains the semiconductor switch (400) having a gate electrode (401), a source electrode (402) and a drain electrode (403), wherein the semiconductor switch (400) can be switched by a predetermined first voltage between the gate electrode (401) and the source electrode (402), with the result that a predetermined current flows between the drain electrode (403) and the source electrode (402), wherein the switching signal can be applied to the gate electrode (401) in order to switch the semiconductor switch (400), wherein the driver circuit (102) contains a control transistor (320) having a base electrode (321), an emitter electrode (322) and a collector electrode (323), wherein the control transistor (320) can be switched by a predetermined second voltage between the base electrode (321) and the emitter electrode (322), with the result that the gate electrode (401) of the semiconductor switch (400) can be connected to the source electrode (402) of the semiconductor switch (400) via the emitter electrode (322) and the collector electrode (323) in order to change over the semiconductor switch, wherein voltage generating means (350) are provided for generating a third voltage, rectified with respect to the second voltage, between the base electrode (321) and the collector electrode (323) of the control transistor (320). The operation of a semiconductor switch can thus be improved in a simple manner.
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