JP2012223043A - Power supply system for vehicle and vehicle including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply system for a vehicle capable of recovering more regeneration power while actively utilizing an external charging system, and the vehicle including the same.SOLUTION: The power supply system for the vehicle includes an external charging system 400 operable in a first operation mode for receiving power from an external power source 300 to transmit charged power to a charge storage device 10 and a second operation mode for receiving power from a power path to transmit charged power to an auxiliary battery 150, and a control device 160 for controlling a main DC-DC converter 140 and the external charging system 400. The control device 160 makes, when a motor generator 130 for traveling generates regenerative power and not all the regeneration power is recovered by the charge storage device 10, the auxiliary battery 150 charge a part of the regenerative power by using the main DC-DC converter 140, and makes the external charging system 400 operated in the second operation mode and makes the auxiliary battery 150 charge the other part of the regenerative power.

Description

  The present invention relates to a vehicle power supply system and a vehicle including the same, and more particularly to a vehicle power supply system including a power storage device that can be charged by a power supply external to the vehicle and a vehicle including the same.

  2. Description of the Related Art In recent years, as an environmentally friendly vehicle, an electric vehicle that is mounted with a power storage device (for example, a secondary battery or a capacitor) and travels using a driving force generated from electric power stored in the power storage device has attracted attention. Examples of the electric vehicle include an electric vehicle, a hybrid vehicle, and a fuel cell vehicle. And the technique of charging the electrical storage apparatus mounted in these electric vehicles with a commercial power source with high electric power generation efficiency is proposed.

  As in the case of an electric vehicle, a hybrid vehicle is known that can charge an in-vehicle power storage device from a power source outside the vehicle (hereinafter also simply referred to as “external power source”). For example, a so-called “plug-in hybrid vehicle” is known, in which a power storage device can be charged from a general household power source by connecting a power outlet provided in a house and a charging port provided in the vehicle with a charging cable. ing. This can be expected to increase the fuel consumption efficiency of the hybrid vehicle.

  Japanese Patent Laying-Open No. 2009-225587 (Patent Document 1) discloses an example of such a plug-in hybrid vehicle. This plug-in hybrid vehicle is provided with an AC / DC power converter on a path branched from a power path from a main battery to a PCU that drives a motor. The AC / DC power converter receives power from an external power source and charges the main battery, or reversely converts DC to AC and supplies an AC output to an in-vehicle outlet.

JP 2009-225587 A JP 2007-159236 A

  The plug-in hybrid vehicle cannot recover regenerative power to the main battery even if regenerative power is generated on a downhill or the like when the main battery is almost fully charged immediately after external charging. In such a case, the regenerative electric power is discarded as heat or the like, or a braking force is generated by a hydraulic brake instead of the regenerative brake, which causes disadvantages in terms of energy loss and brake pad wear.

  It is preferable that regenerative power can be recovered as much as possible even immediately after such external charging. An auxiliary battery may be considered as the collection destination.

  A plug-in hybrid vehicle disclosed in Japanese Patent Laying-Open No. 2009-225587 (Patent Document 1) includes a DC / DC converter for supplying power to an auxiliary battery or an auxiliary load. However, if a DC / DC converter is designed on the assumption that the regenerative power is recovered, the cost is high and the volume increases, which is not realistic.

  An object of the present invention is to provide a power supply system for a vehicle that enables further recovery of regenerative power while actively using an external charging system, and a vehicle including the same.

  In summary, the present invention provides a power supply system for a vehicle, a drive device that drives a travel motor, a power storage device that accumulates electrical energy for use by the travel motor, and electrical energy that is supplied to an auxiliary load. An auxiliary battery that stores power, a main DC / DC converter that can receive power from an electric power path connecting the power storage device and the drive device, and charge the auxiliary battery, and a power storage device that receives power from an external power source Controlling the first operation mode for sending charging power, the external charging system operable in the second operation mode for receiving power from the power path and sending charging power to the auxiliary battery, the main DC / DC converter, and the external charging system And a control device. When the regenerative power is generated in the traveling motor and the regenerative power cannot be recovered by the power storage device, the control device charges the auxiliary battery with a part of the regenerative power using the main DC / DC converter, The external charging system is operated in the second operation mode to charge the auxiliary battery with another part of the regenerative power.

  Preferably, the power supply system of the vehicle further includes a first connection unit that connects the power storage device and the power path, and a second connection unit that connects the power storage device and the external charging system. When charging the power storage device by receiving power from an external power supply, the control device controls the first connection portion to a non-connected state and controls the second connection portion to a connected state. The control device controls the first connection portion to the connected state and the second connection portion to the non-connected state when the vehicle travels, and regenerative power is generated in the travel motor when the vehicle travels, and the regenerative power Is not collected by the power storage device, the second connection portion is changed from the non-connected state to the connected state.

  Preferably, when charging a part of the regenerative power to the auxiliary battery, the control device sets a target voltage of a voltage to be output to the auxiliary battery side to the main DC / DC converter higher than normal. .

  Preferably, the external charging system includes an AC / DC voltage conversion unit that generates a DC charging voltage for charging the power storage device using AC power from an external power source and outputs the voltage to the power path, and AC in the first operation mode. A sub DC / DC converter that receives DC power from the DC voltage converter and receives DC power from the power path in the second operation mode to charge the auxiliary battery.

  Preferably, the external charging system can receive AC power from an input line to which power is supplied from an external power source, generate a DC charging voltage for charging the power storage device, and output the DC charging voltage to the power path. A first AC / DC voltage converter capable of reversely converting the direct current power of the path into alternating current power, and the auxiliary battery that receives the alternating current power reversely converted from the first AC / DC voltage converter in the second operation mode. And a second AC / DC voltage conversion unit that performs charging.

  Preferably, the external charging system can receive AC power from an input line to which power is supplied from an external power source, generate a DC charging voltage for charging the power storage device, and output the DC charging voltage to the power path. A first AC / DC voltage converter capable of reversely converting the direct-current power of the path into alternating-current power; in the first operation mode, the direct-current power is received from the first AC / DC voltage converter; and in the second operation mode, the power path A sub DC / DC converter that receives DC power from the auxiliary DC battery, and in the second operation mode, AC power that is reversely converted from the first AC / DC voltage converter is received to charge the auxiliary battery. And a second AC / DC voltage conversion unit to be performed.

  More preferably, the vehicle power supply system further includes a service outlet for outputting AC power from the vehicle. When the second AC / DC voltage converter is not operating in the second operation mode, the second AC / DC voltage converter is configured to be able to reverse-convert DC power from the power path into AC power and supply the AC power to the service outlet.

  In another aspect, the present invention is a vehicle including any one of the vehicle power supply systems described above.

  According to the present invention, it is possible to further collect regenerative power by actively using an external charging system mounted on a vehicle even during traveling.

1 is an overall block diagram of a vehicle 100 equipped with a power supply system according to an embodiment of the present invention. It is a figure for demonstrating the main operation | movement of the DC / DC converter for charging, and the main DC / DC converter. It is a figure for demonstrating the situation which becomes a problem in a plug-in vehicle. It is a flowchart for demonstrating the control for collection | recovery of the regenerative electric power which the control apparatus 160 of FIG. 1 performs. It is a figure for demonstrating the state which raised the output voltage of the main DC / DC converter. FIG. 4 is a diagram showing output characteristics of a DC / DC converter 140. It is a figure for demonstrating the state which the output voltage of the sub DC / DC converter 250 rose in step S17. It is a figure for demonstrating collect | recovering regenerative electric power using AC inverter 330. FIG. 10 is a flowchart for illustrating control for recovering regenerative power executed by control device 160 in the second embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

[Embodiment 1]
FIG. 1 is an overall block diagram of a vehicle 100 equipped with a power supply system according to an embodiment of the present invention.

  Referring to FIG. 1, vehicle 100 includes a power storage device 10, a system main relay SMRD, an inverter 120 as a driving device, a motor generator 130, a control device (hereinafter referred to as an ECU (Electronic Control Unit)). ) And 160). Although not shown, the motor generator 130 rotates the drive wheels via a power transmission gear.

  The power storage device 10 is a power storage element configured to be chargeable / dischargeable. The power storage device 10 includes, for example, a secondary battery such as a lithium ion battery, a nickel metal hydride battery, or a lead storage battery, and a power storage element such as an electric double layer capacitor.

  The positive electrode end and the negative electrode end of power storage device 10 are connected to inverter 120 for driving motor generator 130 as a load via switches SW1 and SW2 included in system main relay SMRD. Then, power storage device 10 supplies power for generating driving force of vehicle 100 to inverter 120. The power storage device 10 stores the power generated by the motor generator 130. The output of power storage device 10 is, for example, 200V.

  Switches SW1 and SW2 included in system main relay SMRD are provided on power lines PL1 and NL1 connecting power storage device 10 and inverter 120, respectively. System main relay SMRD switches between power supply and interruption between power storage device 10 and inverter 120 based on a control signal from control device 160.

  Motor generator 130 is an AC rotating electric machine, for example, a permanent magnet type synchronous motor including a rotor in which permanent magnets are embedded.

  The output torque of motor generator 130 is transmitted to drive wheels via a power transmission gear constituted by a speed reducer and a power split mechanism, and causes vehicle 100 to travel. Motor generator 130 can generate electric power by the rotational force of the drive wheels during regenerative braking operation of vehicle 100. Then, the generated power is converted into charging power for power storage device 10 by inverter 120.

  In a hybrid vehicle equipped with an engine (not shown) in addition to motor generator 130, necessary vehicle driving force is generated by operating this engine and motor generator 130 in a coordinated manner. In this case, it is also possible to charge the power storage device 10 using the power generated by the rotation of the engine.

  That is, vehicle 100 in the present embodiment indicates a vehicle equipped with an electric motor for generating vehicle driving force, and is a hybrid vehicle that generates vehicle driving force by an engine and an electric motor, an electric vehicle that is not equipped with an engine, and a fuel cell. Includes automobiles.

  The power supply system of the vehicle is configured by a portion excluding the motor generator 130 from the configuration of the vehicle 100 illustrated.

  The power supply system further includes a main DC / DC converter 140, an auxiliary battery 150, and an auxiliary load 170 as a configuration of a low voltage system (auxiliary system).

  Main DC / DC converter 140 is connected to power lines PL1 and NL1, and converts the DC voltage supplied from power storage device 10 into a low-voltage power supply voltage based on a control signal from control device 160. Main DC / DC converter 140 supplies power supply voltage to auxiliary load 170 and control device 160 and also supplies charging power to auxiliary battery 150. When system main relay SMRD is opened and main DC / DC converter 140 stops the voltage conversion operation, power is supplied from auxiliary battery 150 to auxiliary load 170 and control device 160.

  Auxiliary battery 150 is typically formed of a lead storage battery. The output voltage of auxiliary battery 150 is lower than the output voltage of power storage device 10 and is, for example, about 12V. Lead storage batteries have long been used as batteries for automobiles and have a characteristic of being relatively strong against overcharging.

  Although not shown in FIG. 1, the control device 160 includes a CPU (Central Processing Unit), a storage device, and an input / output buffer, and inputs signals from each sensor and outputs control signals to each device. The vehicle 100 and each device are controlled. Note that these controls are not limited to processing by software, and can be processed by dedicated hardware (electronic circuit).

  Control device 160 generates and outputs a control signal for driving inverter 120 and main DC / DC converter 140. Control device 160 also outputs a control signal for controlling system main relay SMRD.

  Control device 160 receives a duty (DUTY) indicating an operating state of main DC / DC converter 140. Control device 160 also receives a signal (IG-OFF) indicating that the ignition has been turned off.

  The power supply system further includes an external charging system 400 and a charging system main relay SMRC as a configuration for charging power storage device 10 with electric power from external power supply 300. Charging system main relay SMRC includes switches SW3 and SW4.

  The external charging system 400 receives power from an external power source and sends the charging power to the power storage device 10, and receives power from the power path (PL 1, NL 1) connected to the power storage device 10 to the auxiliary battery 150. It is comprised so that it can operate | move in the 2nd operation mode which sends charge electric power.

  External charging system 400 includes a charger 200 that receives power from an external power supply from connection unit 320 and converts it into a charging voltage (DC voltage) of power storage device 10, and a DC voltage output from charger 200 as an auxiliary battery and an auxiliary machine. A DC / DC converter 250 that drops the supply voltage supplied to the load and an AC inverter 330 that converts the voltage of the auxiliary battery 150 into AC 100V are included. The output power of AC inverter 330 is output from service outlet 340 via power lines ACL1 and ACL2. Plug 350 of AC load 360 is inserted into service outlet 340.

  Charging connector 310 of a charging cable is connected to connecting portion 320. Then, electric power from the external power source 300 is transmitted to the vehicle 100 via the charging cable.

  Switches SW3 and SW4 connect power lines PL2 and NL2 connecting power storage device 10 and charger 200 to power storage device 10, respectively. The switches SW3 and SW4 supply and cut off power between the power storage device 10 and the charger 200 based on a control signal SE2 from a battery monitoring unit (not shown) for monitoring the power storage device 10. And switch.

  Charger 200 is connected to connection unit 320 via power lines ACL1 and ACL2. Charger 200 is connected to power storage device 10 through power lines PL2 and NL2. Based on a control signal from control device 160, charger 200 converts AC power from external power supply 300 supplied by power lines ACL1 and ACL2 into DC power that power storage device 10 can charge. Charger 200 outputs the converted DC power to power lines PL2 and NL2.

  Sub DC / DC converter 250 is connected to power lines PL2 and NL2. Sub DC / DC converter 250 steps down DC power output from charger 200 or DC power supplied from power storage device 10 based on a control signal from control device 160. The sub DC / DC converter 250 supplies the stepped-down DC power to the auxiliary system such as the auxiliary battery 150 and the auxiliary load 170.

  Although not shown, control device 160 includes a CPU, a storage device, and an input / output buffer. Control device 160 controls charger 200 and sub DC / DC converter 250 during external charging. Control device 160 controls main DC / DC converter 140, inverter 120, AC inverter 330, and system main relay SMRD during traveling. Note that these controls are not limited to software processing, and can be constructed and processed by dedicated hardware (electronic circuit).

  In FIG. 1, the control device 160 includes the charger 200, the sub DC / DC converter 250, the main DC / DC converter 140, the inverter 120, the AC inverter 330, and the system main relays SMRD and SMRC during external charging and during vehicle travel. Although an example of controlling is shown, other configurations may be used. For example, an ECU for charging control that is activated at the time of external charging and controls charger 200, sub DC / DC converter 250 and system main relay SMRC is provided, and main DC / DC converter 140, inverter 120, AC inverter 330 and The ECU may be different from the ECU that controls the system main relay SMRD.

  FIG. 2 is a diagram for explaining main operations of the charging DC / DC converter and the main DC / DC converter.

  Referring to FIG. 2, during traveling, system main relay SMRD is set to the on state, and system main relay SMRC is set to the off state. When traveling, main DC / DC converter 140 supplies DC voltage (for example, 14 V) from power storage device 10 to auxiliary load 170 and auxiliary battery 150.

  On the other hand, at the time of external charging, system main relay SMRD is set in the off state, and system main relay SMRC is set in the on state. At the time of external charging, AC 100V is supplied from the outside of the vehicle and is converted into DC by the charger 200. The electric power converted into direct current is stepped down by the DC / DC converter 250, and a direct current voltage (for example, 14V) is supplied to the auxiliary load 170 and the auxiliary battery 150.

FIG. 3 is a diagram for explaining a situation that causes a problem in a plug-in vehicle.
Referring to FIG. 3, frame S <b> 1 shows a state where charging is completed until power storage device 10 is fully charged by external charging. Such a state is a state that occurs peculiar to plug-in hybrid vehicles and electric vehicles. Even if the vehicle starts traveling as shown in the frame S2 and travels downhill as shown in the frame S3 and regenerative power is generated before the state of charge SOC of the power storage device 10 decreases, it is shown in the frame S4. As described above, the SOC of the power storage device 10 reaches the upper limit value, and charging is restricted, so that regenerative power cannot be recovered.

  For example, when the place where external charging is always performed (at home, at work, etc.) is on a hill, energy that cannot always be recovered is generated. Therefore, in the present embodiment, the possibility that the regenerative power can be collected in the auxiliary battery is increased. The lead storage battery normally used for the auxiliary battery 150 has a relatively strong characteristic against overcharge, and can be sufficiently used as a collection destination of regenerative power.

  FIG. 4 is a flowchart for illustrating control for recovering regenerative power executed by control device 160 in FIG. 1. The processing of this flowchart is called from the main routine and executed at regular time intervals or whenever a predetermined condition is satisfied.

  Referring to FIGS. 1 and 4, when the process is started, control device 160 determines in step S <b> 11 whether or not regenerative power due to braking is generated in motor generator 130 and inverter 120 of the vehicle.

  If it is not in a state where regenerative power is generated in step S11, the process proceeds to step S19, and control is transferred to the main routine. If it is determined in step S11 that regenerative power is generated, the process proceeds to step S12.

  In step S12, since the state of charge SOC of power storage device 10 has reached the upper limit value or is close to the upper limit value, it is determined whether charging of power storage device 10 needs to be restricted.

  If it is not necessary to limit the charging of the power storage device 10 in step S12, the regenerative power is charged in the power storage device 10, so the process proceeds to step S19, and the control is moved to the main routine. In step S12, when it is necessary to limit charging of the power storage device 10, the process proceeds to step S13. In step S <b> 13, control device 160 increases the output voltage of main DC / DC converter 140.

  FIG. 5 is a diagram for explaining a state where the output voltage of main DC / DC converter 140 is increased.

  Referring to FIG. 5, regenerative energy Ereg generated by motor generator 130 is charged to power storage device 10 via inverter 120, but a part thereof is auxiliary battery 150 via main DC / DC converter 140. Is charged. At this time, if the output voltage of the main DC / DC converter 140 is increased, the charging power to the auxiliary battery 150 tends to increase. For example, the charging power to the auxiliary battery 150 is increased by increasing the output voltage of 14.0 V to 14.5 V during normal times.

  However, if the DC / DC converter 140 outputs a current exceeding its capacity, the voltage drops.

FIG. 6 is a diagram showing output characteristics of the DC / DC converter 140.
As shown in FIG. 6, when the current upper limit value Ilim is exceeded, the DC / DC converter 140 has a protective function called an overcurrent limiter, so that the current is rapidly reduced. In such a situation, since the SOC of power storage device 10 is the upper limit value, the charging restriction is continued.

  Referring to FIGS. 1 and 4 again, if the charging restriction is no longer performed in step S14, the process proceeds to step S18. In step S14, when the state where the charging restriction is performed continues, the process proceeds to step S15.

  In step S <b> 15, control device 160 controls charging system main relay SMRC to the on state and operates sub DC / DC converter 250. Thereby, in addition to the main DC / DC converter 140, the sub DC / DC converter 250 also charges a part of the regenerative power to the auxiliary battery.

  Thereafter, in step S16, if the charging restriction is no longer performed, the process proceeds to step S18. If it is determined in step S16 that charging is continued, the process proceeds to step S17.

  In step S <b> 17, control device 160 increases the output voltage of sub DC / DC converter 250.

  FIG. 7 is a diagram for explaining a state in which the output voltage of the sub DC / DC converter 250 has increased in step S17.

  Referring to FIG. 7, since system main relay SMRC is controlled to be in the ON state, regenerative energy Ereg is supplied to auxiliary battery 150 using not only main DC / DC converter 140 but also sub DC / DC converter 250. It can be recovered. Then, by raising the output voltage of the sub DC / DC converter 250, the regenerative power is appropriately shared by the sub DC / DC converter 250 and the main DC / DC converter 140 and collected. For example, when the output of the main DC / DC converter 140 is increased from 14.0V to 14.5V, the output of the sub DC / DC converter 250 is also increased from 14.0V to 14.5V.

  Referring to FIG. 4 again, when the process of step S17 ends, the process proceeds to step S18. In step S18, the auxiliary battery 150 is charged. In step S19, control is returned to the main routine.

[Embodiment 2]
In the first embodiment, when regenerative power is generated in traveling motor generator 130 and the regenerative power cannot be recovered by power storage device 10, a part of the regenerative power is generated using main DC / DC converter 140. Is charged in the auxiliary battery 150, and the system main relay SMRC is turned on to make the auxiliary battery 150 charge another part of the regenerative power using the external charging system 400. An example in which the sub DC / DC converter 250 is used at this time has been described.

  In the second embodiment, regenerative power is recovered in auxiliary battery 150 using AC inverter 330 in addition to sub DC / DC converter 250.

  FIG. 8 is a diagram for explaining the recovery of regenerative power using the AC inverter 330.

  Referring to FIG. 8, by configuring charger 200 and AC inverter 330 so that reverse conversion is possible, regenerative power can be collected in auxiliary battery 150 through the path indicated by the arrow.

  In a state where system main relays SMRD and SMRC are made conductive, charger 200 is reversely converted from that during external charging. At the same time, the AC inverter 330 is reversely converted from when AC power is supplied to the service outlet 340.

  For example, the charger 200 converts regenerative power of about 200 V DC into AC 100 V and sends it to the AC inverter 330. Then, AC inverter 330 further converts the power converted to AC 100V to DC 14V again to charge auxiliary battery 150.

  FIG. 9 is a flowchart for illustrating control for recovering regenerative power executed by control device 160 in the second embodiment. The processing of this flowchart is called from the main routine and executed at regular time intervals or whenever a predetermined condition is satisfied.

  The process of the flowchart of FIG. 9 performs step S15A instead of step S15 in the process of the flowchart of the embodiment described in FIG. Since other parts are described in FIG. 4, the description will not be repeated.

  In step S15A, control device 160 conducts charging relay SMRC, operates sub DC / DC converter 250, reversely converts charger 200 and AC inverter 330, and passes the path as shown in FIG. But recover the regenerative power.

  As a result, in addition to the main DC / DC converter 140 and the sub DC / DC converter 250, the capabilities of the charger 200 and the AC inverter 330 are also mobilized to process the regenerative power, so the overcurrent limiter as described in FIG. The possibility of working with each converter can be reduced. Thereby, discarding the regenerative energy as heat can be further reduced as compared with the first embodiment.

  If the AC inverter 330 is configured to be reversely convertible, the AC inverter 330 is reversely converted at the time of external charging without providing the sub DC / DC converter 250, so that the auxiliary load 170 and the auxiliary battery 150 are externally connected. Alternatively, a DC power supply voltage may be supplied from an AC voltage applied from.

  Finally, referring to FIG. 1 again, the first and second embodiments will be summarized. The power supply system for the vehicle according to the present embodiment supplies inverter 120 for driving motor generator 130, power storage device 10 that stores electric energy for use by motor generator 130 for traveling, and auxiliary load 170. DC / DC capable of charging auxiliary battery 150 by receiving power from power path (PL1, NL1) connecting between power storage device 10 and inverter 120, and auxiliary battery 150 that stores electrical energy for charging External charging operable in converter 140, a first operation mode that receives power from external power supply 300 and transmits charging power to power storage device 10, and a second operation mode that receives power from the power path and transmits charging power to auxiliary battery 150 Control for controlling system 400, main DC / DC converter 140 and external charging system 400 And a location 160. When the regenerative power is generated in the traveling motor generator 130 and the regenerative power cannot be recovered by the power storage device 10, the control device 160, as shown in FIGS. 7 and 8, the main DC / DC converter 140. Is used to charge the auxiliary battery 150 with a part of the regenerative power, and the external charging system 400 is operated in the second operation mode to charge the auxiliary battery 150 with the other part of the regenerative power.

  Preferably, the power supply system of the vehicle includes a first connection portion (SMRD) that connects power storage device 10 and the power path, and a second connection portion (SMRC) that connects power storage device 10 and external charging system 400. Is further provided. When receiving power from external power supply 300 and charging power storage device 10, control device 160 controls the first connection portion to a non-connected state and controls the second connection portion to a connected state. Control device 160 controls the first connection portion to the connected state and the second connection portion to the non-connected state when the vehicle travels, and regenerative power is generated in travel motor generator 130 during vehicle travel. When the regenerative power cannot be recovered by the power storage device 10, the second connection unit is changed from the non-connected state to the connected state as shown in FIGS.

  Preferably, as shown in FIG. 5, when charging a part of the regenerative power to auxiliary battery 150, control device 160 outputs a voltage that is output to main battery / DC converter 140 toward auxiliary battery 150. The target voltage is set higher than normal.

  Preferably, external charging system 400 generates an AC charging voltage for charging power storage device 10 using AC power from external power supply 300, and outputs the DC charging voltage to the power path (charger 200). And a sub DC / DC converter 250 that receives DC power from the AC / DC voltage converter in the first operation mode, and charges the auxiliary battery by receiving DC power from the power path in the second operation mode.

  Preferably, external charging system 400 can receive AC power from power lines ACL1 and ACL2 to which power is supplied from external power supply 300, generate a DC charging voltage for charging power storage device 10, and output it to the power path. In addition, the first AC / DC voltage conversion unit (charger 200) that can reverse-convert DC power in the power path into AC power, and in the second operation mode, reverse conversion from the first AC / DC voltage conversion unit. And a second AC / DC voltage converter (AC inverter 330) that receives the AC power and charges auxiliary battery 150.

  Preferably, external charging system 400 can receive AC power from power lines ACL1 and ACL2 to which power is supplied from external power supply 300, generate a DC charging voltage for charging power storage device 10, and output it to the power path. In addition, the first AC / DC voltage converter (charger 200) capable of reversely converting the DC power of the power path into AC power, and the first AC / DC voltage converter from the first AC / DC voltage converter in the first operation mode. In the second operation mode, the sub DC / DC converter 250 receives DC power from the power path and charges the auxiliary battery 150, and in the second operation mode, the first AC / DC voltage conversion unit performs reverse conversion. And a second AC / DC voltage conversion unit (AC inverter 330) that receives AC power and charges auxiliary battery 150.

  More preferably, the vehicle power supply system further includes a service outlet 340 for outputting AC power from the vehicle. When the second AC / DC voltage converter (AC inverter 330) is not operating in the second operation mode, the DC power from the power path is converted back to AC power and supplied to the service outlet 340. Configured to be possible.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  10 power storage device, 100 vehicle, 120 inverter, 130 motor generator, 140, 250 DC / DC converter, 150 auxiliary battery, 160 control device, 170 auxiliary load, 200 charger, 300 external power supply, 310 charging connector, 320 connection Part, 330 AC inverter, 340 service outlet, 350 plug, 360 AC load, 400 external charging system, ACL1, ACL2, PL1, PL2 power line, SMRC, SMRD system main relay, SW1-SW4 switch.

Claims (8)

A driving device for driving the travel motor;
A power storage device that stores electrical energy for use by the travel motor;
An auxiliary battery that stores electrical energy to supply the auxiliary load;
A main DC / DC converter capable of receiving power from an electric power path connecting the power storage device and the driving device to charge the auxiliary battery;
A first operation mode for receiving electric power from an external power source and sending charging power to the power storage device; an external charging system operable in a second operation mode for receiving electric power from the power path and sending charging power to the auxiliary battery;
A control device for controlling the main DC / DC converter and the external charging system;
When the regenerative power is generated in the traveling motor and the regenerative power cannot be recovered by the power storage device, the control device uses the main DC / DC converter to partially compensate the regenerative power. A vehicle power supply system that charges a machine battery and causes the external battery system to operate in the second operation mode to charge another part of the regenerative power to the auxiliary battery. A first connecting portion connecting the power storage device and the power path;
A second connecting part for connecting the power storage device and the external charging system;
The control device, when receiving power from an external power source and charging the power storage device, controls the first connection portion to a non-connected state and controls the second connection portion to a connected state,
The control device controls the first connection portion to a connected state and controls the second connection portion to a non-connected state when the vehicle travels, and regenerative power is generated in the travel motor when the vehicle travels. The vehicle power supply system according to claim 1, wherein when the regenerative power cannot be collected by the power storage device, the second connection unit is changed from a non-connected state to a connected state.   When charging a part of the regenerative power to the auxiliary battery, the control device sets a target voltage of a voltage to be output to the auxiliary battery to the main DC / DC converter higher than normal. The vehicle power supply system according to claim 1, wherein the power supply system is set. The external charging system includes:
An AC / DC voltage converter that generates a DC charging voltage for charging the power storage device using AC power from the external power source and outputs the DC charging voltage to the power path;
A sub DC / DC converter that receives DC power from the AC / DC voltage conversion unit in the first operation mode and charges the auxiliary battery by receiving DC power from the power path in the second operation mode. The power supply system for a vehicle according to any one of claims 1 to 3. The external charging system includes:
It is possible to generate a DC charging voltage for receiving AC power from an input line to which power is supplied from the external power source and to charge the power storage device, and to output the DC charging voltage to the power path. A first AC / DC voltage conversion unit capable of reversely converting the AC to AC power;
And a second AC / DC voltage converter that receives AC power that has been inversely converted from the first AC / DC voltage converter and charges the auxiliary battery in the second operation mode. The vehicle power supply system according to any one of? The external charging system includes:
It is possible to generate a DC charging voltage for receiving AC power from an input line to which power is supplied from the external power source and to charge the power storage device, and to output the DC charging voltage to the power path. A first AC / DC voltage conversion unit capable of reversely converting the AC to AC power;
A sub DC / DC converter that receives DC power from the first AC / DC voltage converter in the first operation mode and charges the auxiliary battery by receiving DC power from the power path in the second operation mode. When,
And a second AC / DC voltage converter that receives AC power that has been inversely converted from the first AC / DC voltage converter and charges the auxiliary battery in the second operation mode. The vehicle power supply system according to any one of? A service outlet for outputting AC power from the vehicle;
When the second AC / DC voltage conversion unit is not operating in the second operation mode, the DC power from the power path can be converted back to AC power and supplied to the service outlet. The power supply system for a vehicle according to claim 5 or 6 configured.   A vehicle provided with the power supply system of the vehicle of any one of Claims 1-7.

Images