In-vehicle cutoff current supply device

An in-vehicle cutoff current supply device that is to be used in an in-vehicle system including a power supply unit and a cutoff device that performs a cutoff operation to interrupt a power path in response to current flowing into a current input unit, the in-vehicle cutoff current supply device causing current supplied from the power supply unit to flow toward the current input unit when a cutoff condition is met, the in-vehicle cutoff current supply device comprising:

• a voltage conversion unit that converts a voltage input from the power supply unit side and applies an output voltage between a first conductive path and a second conductive path;
• a control unit that performs feedback control to control the voltage conversion unit so that the output voltage matches a target voltage;
• a drive unit that causes current supplied from the first conductive path to flow toward the current input unit when the cutoff condition is met;
• a current limiting unit that is provided between the power supply unit and the voltage conversion unit and limits current flowing from the power supply unit side to the voltage conversion unit side;
• and
• a parallel switch that is provided in parallel with the current limiting unit,
• wherein the control unit starts the feedback control in a state where the cutoff condition is not met, and
• when the cutoff condition is met, the parallel switch switches to an on state, and current flows from the power supply unit side to the voltage conversion unit side via the parallel switch.