Active current injection through a fuse for an electric mobile application

A controller, comprising:

• a current source circuit electrically coupled to a thermal fuse and structured to determine that a load power throughput of a motive electrical power path is low, and to inject a current across the thermal fuse in response to the load power throughput of the motive electrical power path being low, wherein the thermal fuse is in a series arrangement with a contactor;
• a voltage determination circuit electrically coupled to the thermal fuse and structured to determine at least one of an injected voltage amount and a thermal fuse impedance value, wherein the voltage determination circuit comprises a high pass filter having a cutoff frequency selected in response to a frequency of the injected current;
• wherein the current source circuit electrically coupled to a plurality of fuses, and wherein the current source circuit is further structured to inject the current across each of the plurality of fuses in a selected sequence;
• wherein the current source circuit is further structured to inject the current across a first one of the plurality of fuses at a first shutdown event, and to inject the current across a second one of the plurality of fuses at a second shutdown event.

A method, comprising:

• determining that a load power throughput of a motive electrical power path is low, and to inject a current across a thermal fuse in response to the load power throughput of a motive electrical power path being low, wherein the thermal fuse is in a series arrangement with a contactor;
• determining at least one of an injected voltage amount and a thermal fuse impedance value, wherein the determining is determined at least in part from a high pass filter having a cutoff frequency selected in response to a frequency of the injected current;
• injecting a current across each of a plurality of fuses in a selected sequence;
• and
• injecting the current across a first one of the plurality of fuses at a first shutdown event, and to injecting the current across a second one of the plurality of fuses at a second shutdown event.