Abstract: An intrinsically safe field device of automation technology for use in an explosion-hazard area comprises two connection terminals for connecting a two-wire line; a sensor and/or actuator element for detecting and/or setting a process variable; and a field device electronic system that is connected to the first and second connection terminal and conducts a current supplied via the two-wire line via a current path. The field device electronic system is designed to transmit process variables detected via the sensor element via the two-wire line and/or receive a process variable to be set by the actuator element via the two-wire line The field device electronic system has a shunt resistor circuit with a shunt resistor and two diodes connected in parallel to the shunt resistor. The diodes are in the current path in the flow direction.

Abstract: A circuit assembly for connection to a current source, preferably a 4-20 mA current loop and/or a high-impedance voltage source, preferably a high-impedance voltage source comprising an internal resistance greater than or equal to 100 ohms, includes at least one boost converter with a coil, a diode, in particular a flyback diode, which is connected in series with the coil, an output-side storage capacitor for summing an output voltage, and a switching element for connecting the coil to ground; a circuit part for dynamically controlling the switching element of the boost converter, wherein the circuit part is at least designed to control the switching element of the boost converter in a start-up phase such that the current source directly charges the storage capacitor via the coil until a predefinable reference value is reached.

Abstract: A circuit assembly for connection to a current source, preferably a 4-20 mA current loop and/or a high-impedance voltage source, preferably a high-impedance voltage source comprising an internal resistance greater than or equal to 100 ohms, includes at least one boost converter with a coil, a diode, in particular a flyback diode, which is connected in series with the coil, an output-side storage capacitor for summing an output voltage, and a switching element for connecting the coil to ground; a circuit part for dynamically controlling the switching element of the boost converter, wherein the circuit part is at least designed to control the switching element of the boost converter in a start-up phase such that the current source directly charges the storage capacitor via the coil until a predefinable reference value is reached.