| 摘要 |
The invention concerns a power stage realized by means of a grid-controlled power semiconductor, which power stage is connected to a DC circuit DCC comprising a condenser battery CB discharging to a resistance and which for each power semiconductor S1, S2 comprises a condenser C1, C2 for storage of the control pulse energy of the power semiconductors S1, S2, device for keeping the abovementioned condensers C1, C2 charged and grid control device GC1, GC2 for controlling the power semiconductor by means of the energy charged in the condenser C1, C2. To achieve a power stage which is cost-effective and resistant to interferences, the device for keeping the condenser C1, C2 charged comprises a voltage distribution connection connected across the poles of the DC circuit 1, which voltage distribution connection comprises a diode D1, D2, a resistance R1, R2 and a Zener diode Z1, Z2 connected in series, where the condenser C1, C2 which stores control pulse energy is connected in parallel with the Zener diode Z1, Z2. <IMAGE>
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