Control circuit for limiting a load current, charging circuit and motor vehicle

1. A control circuit comprising:

a controllable semiconductor component; and

a circuit which indirectly limits a load current which flows through the controllable semiconductor component, the circuit comprising a voltage sensor for detecting a voltage between a first terminal of the controllable semiconductor component and a second terminal of the controllable semiconductor component, the voltage sensor being configured to output a value corresponding to the detected voltage,

wherein the circuit is configured to control the controllable semiconductor component based on a value corresponding to a load-current-dependent power loss of the controllable semiconductor component, the load-current-dependent power loss being measured and/or calculated based at least in part on the outputted value corresponding to the detected voltage, and

wherein the circuit is configured to minimize a total ohmic loss caused by charging a quantity of charge and a charging time for the quantity of charge.

2. The control circuit of claim 1 , wherein the circuit is configured to control the controllable semiconductor component based upon a safe operating range of the controllable semiconductor component.

3. The control circuit of claim 1 , wherein the circuit is configured to drive the controllable semiconductor component at least temporarily in a saturation range and/or in a linear operating range of the controllable semiconductor component.

4. The control circuit of claim 1 , wherein the circuit is configured to precalculate a first operating parameter for each of at least two driving alternatives and, depending on the precalculated values of the first operating parameter, to select a driving alternative from the at least two driving alternatives and to apply the selected driving alternative to drive the controllable semiconductor component.

5. The control circuit of claim 1 , wherein the circuit is configured to drive the controllable semiconductor component based upon a characteristic curve, from which a value to be applied of a third operating parameter can be gathered for present measured and/or calculated values of a second operating parameter.

6. A control circuit comprising:

a circuit which indirectly limits a load current which flows through a controllable semiconductor component, the circuit comprising a voltage sensor configured to detect a voltage between a first terminal of the controllable semiconductor component and a second terminal of the controllable semiconductor component and to output a value corresponding to the detected voltage,

wherein the circuit is configured to control the controllable semiconductor component based on a value corresponding to a load-current-dependent temperature of the controllable semiconductor component, the load-current-dependent component temperature being measured and/or calculated based at least in part on the outputted value of the detected voltage, and

wherein the circuit is configured to minimize a total ohmic loss caused by charging a quantity of charge and a charging time for the quantity of charge.

7. The control circuit of claim 6 , wherein the circuit is configured to control the controllable semiconductor component based upon a coolant temperature of the controllable semiconductor component.

8. The control circuit of claim 6 , wherein the circuit is configured to control the controllable semiconductor component based upon a measured load-current-dependent power loss of the controllable semiconductor component and/or a calculated load-current-dependent power loss of the controllable semiconductor component.

9. The control circuit of claim 6 , wherein the circuit is configured to control the controllable semiconductor component based upon a safe operating range of the controllable semiconductor component.

10. The control circuit of claim 9 , wherein the safe operating range of the controllable semiconductor component is based upon temperature.

11. The control circuit of claim 6 , wherein the circuit is configured to drive the controllable semiconductor component at least temporarily in a saturation range and/or in a linear operating range of the controllable semiconductor component.

12. The control circuit of claim 6 , wherein the circuit is configured to precalculate a first operating parameter for each of at least two driving alternatives and, depending on the precalculated values of the first operating parameter, to select a driving alternative from the at least two driving alternatives and to apply the selected driving alternative to drive the controllable semiconductor component.

13. The control circuit of claim 6 , wherein the circuit is configured to drive the controllable semiconductor component based upon a characteristic curve, from which a value to be applied of a third operating parameter can in each case be gathered for present measured and/or calculated values of a second operating parameter.

14. A motor vehicle comprising:

an on-board electrical power supply system comprising a charging circuit, the charging circuit comprising:

a controllable semiconductor component configured to limit the load current; and

a control circuit which indirectly limits a load current which flows through the controllable semiconductor component, the circuit comprising a voltage sensor configured to detect a voltage between a first terminal of the controllable semiconductor component and a second terminal of the controllable semiconductor component and to output a value corresponding to the detected voltage,

wherein the control circuit is configured to control the controllable semiconductor component based on a value corresponding to a predetermined factor that occurs in the controllable semiconductor component, the predetermined factor being measured and/or calculated based at least in part on the outputted value corresponding to the detected voltage, and

wherein the circuit is configured to minimize a total ohmic loss caused by charging a quantity of charge and a charging time for the quantity of charge.