Siemens Aktiengesellschaft

Ratko Kosorcic

Erich Schmidtner

An integrated regulating module for current and voltage regulation is employed in a circuit arrangement for limiting and regulating the collector current of a control transistor of a switching network component. The module comprises a pulse width modulator, a reference voltage source, an operational amplifier for current regulation, an operational amplifier for voltage regulation, a disconnect device and two dual outputs. The control transistor is connected in series with a current transformer whose secondary is connected in parallel to a series arrangement of a diode and a variable resistor, and a half-wave rectifier circuit. Two bistable switches are provided such that one input of the first bistable switch is connected to the reference voltage source of the regulating module and the other input is connected to the output of the regulating module. The output of the first bistable switch is connected to one input of the current regulating operational amplifier and the other input is connected to a tap of voltage divider which is connected across the output of the half-wave rectifier. One input of the second bistable switch is connected to the tap of the variable resistor, its other input is connected to a further reference voltage and its output is connected to drive the disconnect device of the integrated regulating module.

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Munich, Germany

Ratko Kosorcic