Power source device for vehicle
First Claim
1. A power source device for a vehicle that includes a driving motor and an electric load mounted on the vehicle, the power source device comprising:
- a first battery that supplies power to the driving motor of the vehicle, the first battery including a cathode;
a switch that is connected between the cathode terminal of the first battery and the driving motor, the switch including a terminal at a side of the driving motor;
a controller that controls on and off operations of the switch;
a second battery that supplies power to the electric load mounted in the vehicle, the second battery including a cathode terminal;
a step-down circuit that is connected between;
(i) the terminal of the switch, and (ii) the cathode terminal of the second battery, steps down an output voltage of the first battery, and provides the stepped-down voltage to the cathode terminal of the second battery, the step-down circuit including a connecting node;
a first power source circuit that supplies power to the controller;
a second power source circuit that supplies power to the step-down circuit, the first and second power source circuits being supplied with power from the second battery and including a connecting node;
a diode that is connected, in a forward direction, between;
(i) the connecting node of the step-down circuit and the second battery, and (ii) the connecting node of the first and second power source circuits, the diode including a cathode; and
a third battery having a cathode terminal connected to the cathode of the diode via a charging circuit and a discharging circuit for charging and discharging the third battery.
1 Assignment
0 Petitions
Accused Products
Abstract
A vehicle power source device reliably turns on a high voltage battery even if the output voltage of a low-voltage ancillary battery drops at the start of driving the vehicle. A request to run on a high-voltage battery (to turn on a relay contact point) is made by means of the operation to start driving a vehicle. A low-voltage ancillary battery and an auxiliary battery supply power to a power source circuit. A relay control unit supplied with power from the power source circuit turns on the relay contact point and turns on the high-voltage battery. When the high-voltage battery is on, the auxiliary battery is charged by means of a step-down circuit. The auxiliary battery holds the charged power by means of a diode without the power being consumed by a group of low-voltage loads.
-
Citations
4 Claims
-
1. A power source device for a vehicle that includes a driving motor and an electric load mounted on the vehicle, the power source device comprising:
-
a first battery that supplies power to the driving motor of the vehicle, the first battery including a cathode; a switch that is connected between the cathode terminal of the first battery and the driving motor, the switch including a terminal at a side of the driving motor; a controller that controls on and off operations of the switch; a second battery that supplies power to the electric load mounted in the vehicle, the second battery including a cathode terminal; a step-down circuit that is connected between;
(i) the terminal of the switch, and (ii) the cathode terminal of the second battery, steps down an output voltage of the first battery, and provides the stepped-down voltage to the cathode terminal of the second battery, the step-down circuit including a connecting node;a first power source circuit that supplies power to the controller; a second power source circuit that supplies power to the step-down circuit, the first and second power source circuits being supplied with power from the second battery and including a connecting node; a diode that is connected, in a forward direction, between;
(i) the connecting node of the step-down circuit and the second battery, and (ii) the connecting node of the first and second power source circuits, the diode including a cathode; anda third battery having a cathode terminal connected to the cathode of the diode via a charging circuit and a discharging circuit for charging and discharging the third battery. - View Dependent Claims (2, 3, 4)
-
Specification