Circuit for inductive power and data transmission with feedback protection

A regenerative limiting circuit for potentially explosive areas, for supplying energy via an inductive interface and for data communication via the inductive interface, the regenerative limiting circuit comprising:

• an input unit having a first data line connection, a second data line connection, a supply line connection, and a zero line connection, each for connecting a connection cable;
• a first limiting unit;
• a second limiting unit;
• a monitoring unit;
• a high-voltage unit having a transformer, an energy input, a control input connected to the monitoring unit, and an output connected to the transformer;
• a node unit;
• and
• a reference potential,
• wherein the first limiting unit is connected to the first data line connection and the second limiting unit is connected to the second data line connection, wherein each of the first limiting unit and the second limiting unit has a resistor and a Zener diode, wherein the Zener diode is connected in each case such that the respective Zener diode connects through to the reference potential in the event of an overvoltage,
• wherein the monitoring unit is connected to the first limiting unit and the second limiting unit and is suitable for evaluating data,
• wherein the output of the high-voltage unit is the inductive interface having a coil for inductively transmitting the energy and for the data communication, and
• wherein the node unit is connected to the supply line connection, the monitoring unit, and the energy input, and is in each case at a distance of at least 0.5 mm from these, and the node unit has an electrically conductive surface area of at least 4 square millimeters.