Circuit arrangement for protecting a from a supply network unit to be operated against overvoltages

摘要

The invention relates to a circuit arrangement for the protection of a from a supply network to be operated with an input unit against overvoltages with the first and second input terminal, which are in connection with the electric power supply network, and an output a with a first and a second output terminal, to which the unit to be protected can be connected, and with a protective circuit, between the first and second input terminal is provided, in order to limit the voltage applied to it, whereby the protective circuit a power semiconductor (igbt and has a control for the power semiconductors. According to the invention, the control is designed as a driver which, by means of a logic assembler lb can be seen by way of voltage events and in the case of an over voltage event the power semiconductors igbt up to the decay of the same as well as activated for this purpose the control of the power semiconductor igbt with an increased gate voltage of up to 100 v in the case of a steep switching edge is.