Power supply system for vehicle

• US 7,847,521 B2
• Filed: 10/28/2008
• Issued: 12/07/2010
• Est. Priority Date: 11/07/2007
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Iida, Takahide
• Primary Examiner(s): Tso; Edward
• Assistant Examiner(s): Ramadan; Ramy
• Application Number:
  US12/289,447
• Publication Number:
  US 20090115375A1
• Time in Patent Office: 770 Days
• Field of Search: 320/109, 320/138
• US Class Current: 320/138
• CPC Class Codes: B60L 2210/12 Buck converters
• CPC Class Codes: B60L 2270/20 Inrush current reduction, i.e. avoiding high currents when connecting the battery
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60L 50/61 by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
• CPC Class Codes: B60L 53/14 Conductive energy transfer
• CPC Class Codes: B60L 58/20 having different nominal voltages
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

A power supply system for a vehicle includes: batteries; motor generators operating as rotating electrical machines driven by electric power in the batteries when the vehicle is running, and constituting a first charger when the batteries are charged by electric power received from a source external to the vehicle and; an inlet receiving the electric power supplied from the external source; a second charger receiving the electric power supplied from the external source and charging the batteries; and a control device selecting one of the first and second chargers and performing control for converting the electric power supplied from the external source to the inlet into charging electric power using the selected charger. Thus, a power supply system for a vehicle that is chargeable from various power supplies at the time of charging and has reduced charge loss can be provided.

Claims

1. A power supply system for a vehicle comprising:

a power storage device;

an input port that receives electric power supplied from a source external to the vehicle;

first and second rotating electrical machines that function as rotating electrical machines driven by electric power supplied from the power storage device when the vehicle is running;

a first charger that is operably configured to receive the electric power supplied from the source external to the vehicle and thereby charge the power storage device;

a second charger that is operably configured to receive the electric power supplied from the source external to the vehicle and thereby charge the power storage device; and

a control device that selects either the first or the second charger to be used for converting the electric power supplied from the source external to the vehicle into charging electric power, wherein

the first charger includes the first and second rotating electrical machines, and

the control device selects either the first or the second charger based on a voltage detected at the input port.

2. The power supply system for a vehicle according to claim 1, wherein

the input port can selectively receive a first power supply voltage and a second power supply voltage, the second power supply voltage being lower than the first power supply voltage, and

the second charger receives the second power supply voltage and performs charging by the second power supply voltage more efficiently than the first charger would be able to perform with the second power supply voltage.

3. The power supply system for a vehicle according to claim 2, further comprising first and second inverters driving the first and second rotating electrical machines, respectively, wherein

the first charger further includes the first and second inverters and stator coils associated with the first and second rotating electrical machines;

the first charger is supplied with an AC voltage from electric power input lines connected to neutral points of the stator coils, and

the second charger does not include the first and second rotating electrical machines or the first and second inverters.

4. The power supply system for a vehicle according to claim 3, wherein

the first power supply voltage, which is received by the first charger, is an AC voltage of 200 V, and

the second power supply voltage, which is received by the second charger, is an AC voltage of 100 V.