Current sensing system

A current sensing system, comprising:

• a busbar connected in a current path between a power supply and a load, said busbar having a temperature dependent resistance with a specific temperature coefficient;
• a switch is disposed in the current path;
• an amplifier having a first input, a second input and an output, said first input and said second input connected to said busbar, and said amplifier configured to sense a voltage difference across a section of said busbar caused by a current in the current path;
• a signal conditioning circuit having a first terminal, a second terminal and a temperature compensation circuit, said first terminal connected to said output of said amplifier, and said temperature compensation circuit acting as a temperature dependent resistance with a temperature coefficient having a sign opposite to the specific temperature coefficient of the temperature dependent resistance of said busbar;
• a comparator having a first input and a second input, said first input of said comparator directly or indirectly connected to said second terminal of said signal conditioning circuit;
• and
• logic circuitry configured to control a state of said switch disposed in the current path, in dependence on an output signal of said comparator.

A current sensing system, comprising:

• a busbar connected in a current path between a power supply and a load, said busbar having a temperature dependent resistance with a positive temperature coefficient;
• a switch is disposed in the current path;
• an amplifier having a first input, a second input and an output, said first input and said second input connected to said busbar, and said amplifier configured to sense a voltage difference across a section of said busbar caused by a current in the current path;
• a signal conditioning circuit having a first terminal, a second terminal and a temperature compensation circuit, said first terminal connected to said output of said amplifier, said temperature compensation circuit acting as a temperature dependent resistance with a temperature coefficient having a sign opposite to the positive temperature coefficient of the temperature dependent resistance of said busbar, and said temperature compensation circuit including a resistor and a diode connected in series, said diode being a silicon diode with a p-n junction;
• a comparator having a first input and a second input, said first input of said comparator directly or indirectly connected to said second terminal of said signal conditioning circuit;
• and
• logic circuitry configured to control a state of said switch disposed in the current path, in dependence on an output signal of said comparator.