Siemens Aktiengesellschaft

Wolfgang Rohl

Ulrich Baumgartl

Circuit configuration for supplying power to electronic tripping device

Voltage transformer with increased electric strength

An intrinsically safe power supply arrangement with a current regulator is provided with a controlled semiconductor, coupled to a clock generator and coupled between a rectifier and a primary winding of a transformer, for periodically interrupting a DC current in response to a clock signal. A short-circuit switch is disposed between a secondary winding of the transformer and an output of the power supply arrangement. A choke is coupled to the short-circuit switch, and a voltage limiter is coupled to the choke. A current regulator, coupled between the voltage limiter and the output of the power supply arrangement, has a retrogressive current-voltage characteristic and a delay stage for producing a time-delayed rise of a selectable combination of current and voltage. A circuit element supplies a selectable input and output signal of the current regulator to an input of a voltage regulator. An output of the voltage regulator is coupled to the clock generator. A current measuring circuit coupled to the primary winding of the transformer and the clock generator limits the current supplied to the primary winding of the transformer in the event of a short-circuit on the secondary side of the transformer.

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Berlin, Germany

Wolfgang Rohl