Electric power control device
An electric power control device includes: an ECU; a DC power supply; a backup power supply which has a control power supply as an operation source, supplies electric power to the ECU when an electric power supply from a battery to the ECU is stopped, and supplies electric power to the DC power supply when an electric power supply from the battery to the DC power supply is stopped; a first ground line connected to a ground terminal of the DC power supply; a second ground line connected to a ground terminal of the backup power supply; a current path formation unit which electrically connects the first ground line to the second ground line and forms a path in which a current flows from the first ground line to the second ground line in one direction; and a noise minimizing component connected to the current path formation unit in series.
1. An electric power control device installed in a vehicle, comprising:
an electronic control unit (ECU) to which electric power is supplied from a battery installed in the vehicle;
a direct current (DC) power supply configured to generate a control power supply from the electric power supplied from the battery;
a backup power supply configured to operate using the control power supply as an operation source, supply electric power to the ECU when electric power supply from the battery to the ECU is stopped, and supply electric power to the DC power supply when the electric power supply from the battery to the DC power supply is stopped;
a first ground line connected to a ground terminal of the DC power supply;
a second ground line connected to a ground terminal of the backup power supply;
a current path formation unit which electrically connects the first ground line to the second ground line and forms a path in which a current flows from the first ground line to the second ground line in one direction; and
a noise minimizing component connected to the current path formation unit in series.
2. The electric power control device according to claim 1 , wherein the current path formation unit is a diode which has an anode electrically connected to the first ground line and a cathode electrically connected to the second ground line.
3. The electric power control device according to claim 2 , wherein the noise minimizing component is an inductor, and
the inductor has a first end portion connected to the cathode and a second end portion connected to the second ground line.