JP2010051092A - Charge system and vehicle including the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce switching noise generated due to charging operation of a power storage device in a charge system for charging the power storage device connected to an electrical-load device, mounted to a vehicle, from a power supply outside the vehicle by using the electrical-load device, and the vehicle including the same. <P>SOLUTION: During charging to the power storage device B from an external power supply 70, a neutral point N2 of a second motor/generator MG2 and a neutral point N1 of a first motor/generator MG1 are electrically connected to each other by a power line PL1. The power from the external power supply 70 is given to the non-neutral-point side of a W-phase coil W2 of the second motor/generator MG2. An ECU 30 stops a second inverter 20 (gates of all switching elements are shut off) while subjecting at least one phase of a first inverter 10 to switching control. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a charging system and a vehicle including the same, and more particularly to a charging system for charging a power storage device connected to an electric load device mounted on the vehicle from a power source outside the vehicle using the electric load device. Related to the vehicle.

  Japanese Patent Laying-Open No. 2007-318970 (Patent Document 1) discloses a charging system that charges a power storage device mounted on a vehicle from a commercial power supply outside the vehicle via neutral points of two AC motors. In this charging system, based on the effective value and phase of the voltage of the commercial power source and the charging power command value for the power storage device, the command value of the current flowing through the power input line connected to the neutral point is the voltage of the commercial power source. A current command value in phase with is generated. Based on the generated current command value, the zero-phase voltages of the two inverters corresponding to the two AC motors are controlled.

According to this charging system, the same amount and phase of charging current flows in each phase coil in each AC motor, and each inverter converts the current into DC current to charge the power storage device (see Patent Document 1).
JP 2007-318970 A Japanese Patent Application Laid-Open No. 8-214592 JP 2007-336740 A

  However, in the charging system disclosed in the above Japanese Patent Application Laid-Open No. 2007-318970, since the same amount and the same phase current flows in each phase coil in each AC motor, the magnetic fluxes in each phase coil cancel each other. The equivalent inductance of the motor is small. For this reason, there is a problem that the ripple component of the current flowing in the motor is increased and the switching noise generated from the motor is increased.

  Accordingly, the present invention has been made to solve such a problem, and an object of the present invention is to charge a power storage device connected to an electric load device mounted on a vehicle from a power source outside the vehicle using the electric load device. In a charging system and a vehicle equipped with the charging system, switching noise generated due to the charging operation of the power storage device is reduced.

  According to the present invention, a charging system is a charging system that charges a power storage device connected to an electric load device mounted on a vehicle from a power source outside the vehicle (hereinafter also simply referred to as “external power source”). The electrical load device includes first and second inverters connected in parallel to each other and first and second AC rotating electric machines driven by the first and second inverters. The charging system includes a connection device, a power line, and a control device. The connection device is configured to connect one end of the external power supply to the winding of the first AC rotating electric machine and connect the other end of the external power supply to the DC line of the electric load device. The power line connects the winding of the first AC rotating electric machine and the winding of the second AC rotating electric machine in series. The control device stops the first inverter and performs switching control on at least one phase of the second inverter when the power storage device is charged from the external power source.

  Preferably, the ground capacity of the first AC rotating electric machine is larger than the ground capacity of the second AC rotating electric machine.

  Preferably, the leakage inductance of the second AC rotating electric machine is larger than the leakage inductance of the first AC rotating electric machine. Then, the control device stops the first inverter and charges and controls all the phase arms of the second inverter simultaneously when charging the power storage device from the external power source.

  Preferably, the external power source is an AC power source. The connection device includes a rectifier circuit and first and second power lines. The rectifier circuit rectifies AC power from the AC power supply. The first power line connects one of the output ends of the rectifier circuit to the winding of the first AC rotating electric machine. The second power line connects the other output terminal of the rectifier circuit to the negative line of the electric load device.

  Preferably, the external power source is an AC power source. The connection device includes first and second power lines and a rectifier circuit. The first power line connects one end of the AC power source to the winding of the first AC rotating electric machine. The rectifier circuit is connected in parallel to the first and second inverters. The second power line connects the other end of the AC power source to the rectifier circuit.

  Preferably, each of the first and second AC rotating electric machines includes a star-connected multiphase winding as a stator winding. The connection device connects an external power supply to the non-neutral point side of any winding in the multiphase winding of the first AC rotating electric machine. The power line is disposed between the neutral point of the multiphase winding of the first AC rotating electric machine and the neutral point of the multiphase winding of the second AC rotating electric machine.

  Preferably, each of the first and second AC rotating electric machines includes a star-connected multiphase winding as a stator winding. The connection device connects an external power supply to the non-neutral point side of any winding in the multiphase winding of the first AC rotating electric machine. The power line includes a non-neutral point side of a winding different from a winding to which an external power source is connected in the first AC rotating electric machine and a non-middle of any winding in the multiphase winding of the second AC rotating electric machine. It is arranged between the sex point side. The control device performs switching control on at least one of phases different from the winding connected to the power line in the second AC rotating electric machine for the second inverter during charging of the power storage device from the external power source.

  Preferably, each of the first and second AC rotating electric machines includes a star-connected multiphase winding as a stator winding. The connection device connects an external power supply to the non-neutral point side of any winding in the multiphase winding of the first AC rotating electric machine. The power line is disposed between the neutral point of the multiphase winding of the first AC rotating electric machine and the non-neutral point side of any winding in the multiphase winding of the second AC rotating electric machine. . The control device performs switching control on at least one of phases different from the winding connected to the power line in the second AC rotating electric machine for the second inverter during charging of the power storage device from the external power source.

  Preferably, each of the first and second AC rotating electric machines includes a star-connected multiphase winding as a stator winding. The connection device connects an external power supply to the non-neutral point side of any winding in the multiphase winding of the first AC rotating electric machine. The power line is arranged between the non-neutral point side of the winding different from the winding connected to the external power source in the first AC rotating electrical machine and the neutral point of the multiphase winding of the second AC rotating electrical machine. Established.

  Preferably, each of the first and second AC rotating electric machines includes a star-connected multiphase winding as a stator winding. The connection device connects an external power source to the neutral point of the multiphase winding of the first AC rotating electric machine. The power line is arranged between a non-neutral point side of any winding in the multiphase winding of the first AC rotating electrical machine and a neutral point of the multiphase winding of the second AC rotating electrical machine. .

  Preferably, each of the first and second AC rotating electric machines includes a star-connected multiphase winding as a stator winding. The connection device connects an external power source to the neutral point of the multiphase winding of the first AC rotating electric machine. The power line includes a non-neutral point side of any winding in the multi-phase winding of the first AC rotating electric machine and a non-neutral point side of any winding in the multi-phase winding of the second AC rotating electric machine. Between the two. The control device performs switching control on at least one of phases different from the winding connected to the power line in the second AC rotating electric machine for the second inverter during charging of the power storage device from the external power source.

  According to the invention, the vehicle includes a wheel that receives a driving torque from at least one of the first and second AC rotating electric machines, and any of the charging systems described above.

  In the present invention, the winding of the first AC rotating electrical machine and the winding of the second AC rotating electrical machine are connected in series by the power line, and when charging the power storage device from the external power source, the first inverter is stopped, Since at least one phase of the second inverter is subjected to switching control, a state in which the magnetic fluxes of the respective phase windings cancel each other does not occur in at least the first AC rotating electric machine, and the winding inductance is fully utilized.

  Therefore, according to the present invention, switching noise generated during charging of the power storage device from the external power source can be effectively reduced.

  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]
1 is an overall block diagram of a vehicle according to Embodiment 1 of the present invention. Referring to FIG. 1, vehicle 100 includes a power storage device B, a first inverter 10, a second inverter 20, a first motor generator MG1, a second motor generator MG2, wheels DW, an ECU (Electronic). Control Unit) 30. Vehicle 100 further includes power lines PL <b> 1 to PL <b> 3, full-wave rectifier circuit 40, charging port 50, and relay 60.

  Power storage device B is connected to positive line MPL and negative line MNL. First inverter 10 includes a U-phase arm 12, a V-phase arm 14, and a W-phase arm 16. U-phase arm 12, V-phase arm 14 and W-phase arm 16 are connected in parallel between positive electrode line MPL and negative electrode line MNL. The U-phase arm 12 includes switching elements T11 and T12 connected in series, the V-phase arm 14 includes switching elements T13 and T14 connected in series, and the W-phase arm 16 includes switching elements connected in series. It consists of elements T15 and T16. Diodes D11 to D16 are connected in antiparallel to the switching elements T11 to T16, respectively.

  Second inverter 20 includes a U-phase arm 22, a V-phase arm 24, and a W-phase arm 26. The configuration of the second inverter 20 is the same as that of the first inverter 10. As the switching elements of the first inverter 10 and the second inverter 20, for example, an IGBT (Insulated Gate Bipolar Transistor) or a power MOSFET (Metal Oxide Semiconductor Field-Effect Transistor) can be used.

  First motor generator MG1 includes a three-phase coil including U-phase coil U1, V-phase coil V1, and W-phase coil W1. U-phase coil U1, V-phase coil V1 and W-phase coil W1 are Y-connected to form neutral point N1. Second motor generator MG2 also includes a three-phase coil including U-phase coil U2, V-phase coil V2, and W-phase coil W2, and U-phase coil U2, V-phase coil V2, and W-phase coil W2 are Y-connected. A sex point N2 is formed.

  Power line PL1 is arranged between neutral point N1 of first motor generator MG1 and neutral point N2 of second motor generator MG2. Relay 60 is arranged on power line PL1. Full-wave rectifier circuit 40 includes diodes D41 to D44. Diodes D41 and D42 are connected in series between power lines PL2 and PL3, and an intermediate tap (a connection node of diodes D41 and D42) is connected to one of terminals of charging port 50. Diodes D43 and D44 are also connected in series between power lines PL2 and PL3, and an intermediate tap thereof is connected to the other terminal of charging port 50. Power line PL2 is connected to the non-neutral point side of any coil of second motor generator MG2 (hereinafter referred to as W-phase coil W2), and power line PL3 is connected to negative electrode line MNL.

  The power storage device B is a rechargeable DC power source, and includes, for example, a secondary battery such as nickel metal hydride or lithium ion. The power storage device B supplies power to the first inverter 10 and the second inverter 20. Power storage device B is charged by receiving regenerative power generated by at least one of first motor generator MG1 and second motor generator MG2. Furthermore, power storage device B is charged by external power supply 70 (for example, system AC power supply) using first and second motor generators MG1, MG2 and first and second inverters 10, 20. Note that a large-capacity capacitor may be used as the power storage device B.

  First inverter 10 converts a DC voltage from power storage device B into a three-phase AC voltage based on drive signal PWI1 from ECU 30, and outputs the converted three-phase AC voltage to first motor generator MG1. First inverter 10 converts, for example, a three-phase AC voltage generated by first motor generator MG1 into a DC voltage using power from an engine (not shown; the same applies hereinafter) to a power storage device B and a second inverter. 20 to at least one of them.

  Second inverter 20 converts the DC voltage from power storage device B into a three-phase AC voltage based on drive signal PWI2 from ECU 30, and outputs the converted three-phase AC voltage to second motor generator MG2. In addition, second inverter 20 converts the three-phase AC voltage generated by second motor generator MG2 using the rotational force of wheel DW into a DC voltage and outputs it to power storage device B during braking of the vehicle.

  Here, when charging of the power storage device B is requested from the external power source 70, the second inverter 20 stops based on a command from the ECU 30 (gates of all switching elements), and the first inverter 10 includes the charging port 50, A power storage device based on a drive signal PWI2 includes electric power supplied from an external power source 70 through a full-wave rectifier circuit 40, a power line PL2, a W-phase coil W2 of the second motor generator MG2, a power line PL1 and a coil of the first motor generator MG1 in sequence. The voltage is converted to a voltage level of B and output to the power storage device B.

  The first motor generator MG1 and the second motor generator MG2 are three-phase AC rotating electric machines, and include, for example, a three-phase permanent magnet synchronous motor having a permanent magnet in the rotor. First motor generator MG1 is power-driven or regeneratively driven by first inverter 10. For example, first motor generator MG1 is connected to the engine, generates electric power using the power of the engine, and cranks the engine when the engine is started. The second motor generator MG2 is power-driven or regeneratively driven by the second inverter 20. Second motor generator MG2 generates a driving force for driving wheel DW, and generates electric power by receiving the kinetic energy of the vehicle from wheel DW during braking of the vehicle.

  The second motor generator MG2 that generates the travel driving force is larger than the first motor generator MG1, and has a ground capacity (between the second motor generator MG2 and the vehicle casing ground). The stray capacitance) is larger than the ground capacitance of the first motor generator MG1. In the first embodiment, full-wave rectifier circuit 40 is connected to second motor generator MG2 having a relatively large ground capacity. When charging power storage device B from external power source 70, first motor generator MG1 and second motor generator MG2 are charged. Motor generator MG2 functions as a smoothing reactor in the charging system.

  Relay 60 is turned on in response to signal RE from ECU 30 during charging of power storage device B from external power supply 70, and electrically connects neutral point N1 of first motor generator MG1 and neutral point N2 of second motor generator MG2. Connect. On the other hand, except when charging the power storage device B from the external power supply 70, the relay 60 is turned off in response to the signal RE to electrically disconnect the neutral point N1 and the neutral point N2. Full-wave rectifier circuit 40 rectifies AC power from external power supply 70 input from charging port 50 and outputs it to power line PL2 when power storage device B is charged from external power supply 70.

  The ECU 30 generates a PWM (Pulse Width Modulation) signal for driving the first inverter 10, and outputs the generated PWM signal to the first inverter 10 as a drive signal PWI1. Further, the ECU 30 generates a PWM signal for driving the second inverter 20, and outputs the generated PWM signal to the second inverter 20 as a drive signal PWI2.

  Here, when charging power storage device B from external power supply 70, ECU 30 turns on relay 60 by signal RE. Further, the ECU 30 outputs a command for shutting off the gates of the switching elements of the second inverter 20 to the second inverter 20 and stops the second inverter 20. Then, ECU 30 uses all of W-phase coil W2 of second motor generator MG2 and at least one coil of first motor generator MG1 (hereinafter referred to as U-phase coil U1) as a smoothing reactor, and all the power is supplied from external power source 70. The first inverter is configured to convert the power supplied through wave rectifier circuit 40, power line PL2, W-phase coil W2, power line PL1 and U-phase coil U1 to the voltage level of power storage device B and output the same to power storage device B. 10 U-phase arms 12 are controlled to be switched.

  In vehicle 100, when power storage device B is charged from external power supply 70, neutral point N1 of first motor generator MG1 and neutral point N2 of second motor generator MG2 are electrically connected by power line PL1, Electric power from external power supply 70 is applied to W-phase coil W2 of 2-motor generator MG2. Then, the second inverter 20 is stopped (all arms are off), and the U-phase arm 12 of the first inverter 10 is subjected to switching control. Then, the electric power supplied from the external power source 70 to the W-phase coil W2 does not flow to the second inverter 20, but flows from the W-phase coil W2 to the first inverter 10 via the power line PL1 and the U-phase coil U1 sequentially. The power storage device B is charged by one inverter 10. Therefore, when the power storage device B is charged from the external power supply 70, the two coils of the W-phase coil W2 and the U-phase coil U1 are used as the smoothing reactor.

  FIG. 2 is an equivalent circuit diagram of the system shown in FIG. 1 when power storage device B is charged from external power supply 70. Referring to FIG. 2, as described above, when power storage device B is charged from external power supply 70, second inverter 20 is stopped (all arms are off), and first inverter 10 is switching-controlled only for U-phase arm 12. Therefore, in this equivalent circuit, only the U-phase arm 12 of the first inverter 10 is shown for the first inverter 10 and the second inverter 20.

  External power supply 70 is connected to power lines PL2 and PL3 through full-wave rectifier circuit 40. Inductance Lmg2 connected to power line PL2 indicates the coil inductance of second motor generator MG2, specifically, the inductance of W-phase coil W2. Inductance Lmg1 connected to inductance Lmg2 via power line PL1 indicates the coil inductance of first motor generator MG1, and specifically indicates the inductance of U-phase coil U1. Inductance Lmg1 is connected to U-phase arm 12.

  Capacitance Cmg1 indicates the ground capacitance (floating capacitance between U-phase coil U1 and vehicle casing ground 92) of first motor generator MG1. Capacitance Cmg2 indicates the ground capacity of second motor generator MG2 (the stray capacity between W-phase coil W2 and housing ground 92) (hereinafter, capacity Cmg1 and Cmg2 are referred to as “motor ground capacity Cmg1” and “ Also referred to as “motor ground capacity Cmg2”).

  As can be seen from this equivalent circuit, in this charging system, the W-phase coil W2 of the second motor generator MG2 and the U-phase coil U1 of the first motor generator MG1 are connected in series and used as a smoothing reactor. Therefore, the switching noise generated when the power storage device B is charged can be effectively reduced.

  In addition, as described above, second motor generator MG2 that generates travel driving force is larger than first motor generator MG1, and the ground capacity of second motor generator MG2 is greater than the ground capacity of first motor generator MG1. However, in the first embodiment, the circuit is configured such that the second motor generator MG2 having a relatively large ground capacity is closer to the external power supply 70 than the first motor generator MG1. That is, external power supply 70 is connected to second motor generator MG2 having a relatively large ground capacity via full-wave rectifier circuit 40. The reason for this circuit configuration is to reduce the current of the switching frequency component that flows to the housing ground 92 via the motor-to-ground capacitors Cmg1 and Cmg2. Hereinafter, this point will be described.

  When the power storage device B is charged from the external power source 70, the motor ground capacitance Cmg1 arranged on the first inverter 10 side in accordance with the switching operation of the first inverter 10 (U-phase arm 12) has a voltage represented by the following equation: Fluctuates.

ΔVmg1 = (Lmg1 + 2Lmg2) / (Lmg1 + Lmg2) × (VDC / 2) (1)
Here, it is assumed that the motor ground capacity Cmg1 is connected to an intermediate point of the coil of the first motor generator MG1 (more specifically, an intermediate point of the U-phase coil U1 energized during charging). Further, a voltage fluctuation represented by the following equation is applied to the motor ground capacitance Cmg2 arranged on the external power supply 70 side.

ΔVmg2 = Lmg2 / (Lmg1 + Lmg2) × (VDC / 2) (2)
Here, it is assumed that the motor ground capacity Cmg2 is connected to the intermediate point of the coil of the second motor generator MG2 (more specifically, the intermediate point of the W-phase coil W2 energized during charging).

  From the expressions (1) and (2), it can be seen that ΔVmg2 <ΔVmg1, that is, the voltage fluctuation of the ground capacity of the motor arranged on the external power supply 70 side is smaller. A value obtained by multiplying the voltage variation by the motor ground capacity (this value indicates electric charge) with respect to time is the current of the switching frequency component flowing through the housing ground 92. Therefore, the circuit configuration in which the second motor generator MG2 having a large motor ground capacity is arranged on the external power supply 70 side with a small voltage fluctuation is more effective than the circuit configuration in which the first motor generator MG1 is arranged on the external power supply 70 side. It is possible to reduce the current of the switching frequency component that flows to the housing ground 92 via the motor ground capacitances Cmg1 and Cmg2.

  In other words, when the power storage device B is charged from the external power source 70, the external power source 70 is connected to the second motor generator MG2 having a large motor ground capacity via the full-wave rectifier circuit 40, and the second inverter 20 is stopped and the first inverter 20 is stopped. The switching control of the inverter 10 is connected to the first motor generator MG1 via the motor ground capacities Cmg1 and Cmg2 rather than the case where the external power source 70 is connected to the first motor generator MG1 to stop the first inverter 10 and the second inverter 20 is switched. Thus, the current of the switching frequency component flowing through the housing ground 92 can be reduced.

  FIG. 3 is a functional block diagram of ECU 30 shown in FIG. Referring to FIG. 3, ECU 30 includes a first inverter control unit 32, a second inverter control unit 34, and a charge control unit 36. When the signal CTL from the charge control unit 36 is inactivated, the first inverter control unit 32 detects the detected value of the voltage VDC between the positive line MPL and the negative line MNL, the torque command value TR1 of the first motor generator MG1. Based on the detected values of the motor current MCRT1 and the rotor rotation angle θ1 of the first motor generator MG1, a drive signal PWI1 for driving the first motor generator MG1 is generated. On the other hand, when the signal CTL is activated, the first inverter control unit 32 controls the switching of the U-phase arm 12 of the first inverter 10 based on the command AC from the charge control unit 36 and from the external power supply 70. Drive signal PWI1 for converting the power of the power to the voltage level of power storage device B is generated.

  When the signal STP from the charge control unit 36 is inactivated, the second inverter control unit 34 detects the voltage VDC, the torque command value TR2 of the second motor generator MG2, and the motor of the second motor generator MG2. Based on the detected values of current MCRT2 and rotor rotation angle θ2, drive signal PWI2 for driving second motor generator MG2 is generated. On the other hand, when the signal STP is activated, the second inverter control unit 34 generates a command for stopping the second inverter 20 (all arms off) and outputs the command to the second inverter 20.

  When charging power storage device B from external power supply 70, charging control unit 36 activates signal RE output to relay 60 (FIG. 1) provided on power line PL1 to turn on relay 60. In addition, the charge control unit 36 activates the signal CTL output to the first inverter control unit 32 and activates the signal STP output to the second inverter control unit 34. Then, based on voltage VAC of external power supply 70 and charging current IAC from external power supply 70, charging control unit 36 converts the power supplied from external power supply 70 to the voltage level of power storage device B and outputs the voltage. A command AC for controlling the U-phase arm 12 of the first inverter 10 is generated, and the generated command AC is output to the first inverter control unit 32.

  Note that voltage VDC, motor currents MCRT1 and MCRT2, rotor rotation angles θ1 and θ2, voltage VAC, and charging current IAC are each detected by a sensor (not shown). Further, the torque command values TR1 and TR2 are calculated by a vehicle ECU (not shown) based on traveling conditions such as the accelerator pedal depression amount and the vehicle speed.

  FIG. 4 is a diagram showing operation waveforms of the respective phase arms of first and second inverters 10 and 20 when power storage device B is charged from external power supply 70. Referring to FIG. 4, only the U-phase arm 12 of the first inverter 10 is subjected to switching control, and the V-phase arm 14 and the W-phase arm 16 of the first inverter 10 and the U-phase arm 22 and the V-phase arm 24 of the second inverter 20. And the upper and lower arms of each of the W phase arms 26 are all turned off. The reason why the on / off timings of the upper and lower arms of the U-phase arm 12 to be switched are slightly different is that a dead time is provided to prevent the upper and lower arms from being turned on simultaneously.

  As described above, in Embodiment 1, when power storage device B is charged from external power supply 70, neutral point N2 of second motor generator MG2 and neutral point N1 of first motor generator MG1 are connected by power line PL1. Electrically connected. Then, power from external power supply 70 is applied to the non-neutral point side of W-phase coil W2 of second motor generator MG2, second inverter 20 is stopped, and U-phase arm 12 of first inverter 10 is switched. Is done. Thereby, two coils, W-phase coil W2 and U-phase coil U1, can be utilized as a smoothing reactor. Therefore, according to the first embodiment, switching noise generated when charging power storage device B from external power supply 70 can be effectively reduced.

  In the first embodiment, when power storage device B is charged from external power supply 70, second motor generator MG2 having a relatively large motor ground capacity is provided for the circuit configuration between external power supply 70 and power storage device B. The circuit is configured to be arranged closer to external power supply 70 than first motor generator MG1. Therefore, according to the first embodiment, it is possible to reduce the current of the switching frequency component flowing from the external power supply 70 to the housing ground 92 when the power storage device B is charged.

[Modification of Embodiment 1]
In the above description, when the power storage device B is charged from the external power source 70, only the U-phase arm 12 is controlled to be switched in the first inverter 10. However, as shown in FIG. Switching control may be performed simultaneously. If all the phase arms of the first inverter 10 are controlled to switch simultaneously, only the leakage inductance can be used in the first motor generator MG1, but the inductance of the W phase coil W2 of the second motor generator MG2 can be used.

  Then, by performing switching control on all the phase arms of the first inverter 10 at the same time, a charging current flows uniformly to each phase coil of the first motor generator MG1, so that the winding resistance of the first motor generator MG1 is one-phase energized. It becomes 1/3 compared with the case. Therefore, according to this modification, it is possible to reduce loss during charging of power storage device B from external power supply 70.

[Embodiment 2]
FIG. 6 is an overall block diagram of a vehicle according to the second embodiment. Referring to FIG. 6, in this vehicle 100A, in the configuration of vehicle 100 according to the first embodiment shown in FIG. 1, the non-neutral point side of U-phase coil U2 of second motor generator MG2 and first motor generator MG1. A power line PL1 is disposed between the U-phase coil U1 and the non-neutral point. Vehicle 100A includes ECU 30A instead of ECU 30.

  ECU 30A turns on relay 60 by signal RE when charging power storage device B from external power supply 70. In addition, the ECU 30 </ b> A outputs a command for shutting off each switching element of the second inverter 20 to the second inverter 20, and stops the second inverter 20. Then, ECU 30A controls switching of only V-phase arm 14 for first inverter 10 and stops U-phase arm 12 and W-phase arm 16 (both upper and lower arms are off). Thus, when power storage device B is charged from external power supply 70, power line PL2, W-phase coil W2 and U-phase coil U2 of second motor generator MG2, power line PL1, and U of first motor generator MG1 are charged from full-wave rectifier circuit 40. An electric circuit to the first inverter 10 is formed through the phase coil U1 and the V-phase coil V1 in sequence, and the power storage device B is charged by the first inverter 10.

  Therefore, when charging power storage device B from external power supply 70, the four coils of W-phase coil W2 and U-phase coil U2 of second motor generator MG2 and U-phase coil U1 and V-phase coil V1 of first motor generator MG1 are smoothed. Used as a reactor. Other functions of ECU 30A are the same as those of ECU 30 in the first embodiment.

  FIG. 7 shows operation waveforms of the respective phase arms of first and second inverters 10 and 20 when power storage device B is charged from external power supply 70 in the second embodiment. Referring to FIG. 7, only the V-phase arm 14 of the first inverter 10 is subjected to switching control, and the U-phase arm 12 and the W-phase arm 16 of the first inverter 10 and the U-phase arm 22 and the V-phase arm 24 of the second inverter 20. And the upper and lower arms of each of the W-phase arms 26 are all turned off. The reason why the on / off timing of the upper and lower arms of the V-phase arm 14 that is controlled to be switched is slightly different is that a dead time is provided to prevent the upper and lower arms from being turned on simultaneously.

  As described above, in the second embodiment, four coils connected in series can be used as a smoothing reactor when charging power storage device B from external power supply 70. Therefore, the same effects as in the first embodiment can be obtained also in the second embodiment.

[Embodiment 3]
FIG. 8 is an overall block diagram of a vehicle according to the third embodiment. Referring to FIG. 8, in this vehicle 100B, in the configuration of vehicle 100A according to the second embodiment shown in FIG. 6, power line PL1 is replaced with the non-neutral point side of U-phase coil U2 of second motor generator MG2. Connected to neutral point N2 of second motor generator MG2. The other configuration of vehicle 100B is the same as that of vehicle 100A according to the second embodiment shown in FIG.

  In vehicle 100B, when power storage device B is charged from external power supply 70, full-wave rectifier circuit 40 provides power line PL2, W-phase coil W2 of second motor generator MG2, neutral point N2, power line PL1, and first motor generator. An electric circuit to the first inverter 10 is formed through the U-phase coil U1 and the V-phase coil V1 of the MG1 in sequence, and the power storage device B is charged by the first inverter 10. Therefore, at the time of charging power storage device B from external power supply 70, three coils of W-phase coil W2 of second motor generator MG2 and U-phase coil U1 and V-phase coil V1 of first motor generator MG1 are used as a smoothing reactor. .

  As described above, in Embodiment 3, when charging power storage device B from external power supply 70, three-phase coils connected in series can be used as a smoothing reactor. Therefore, the same effects as those of the first embodiment can be obtained by the third embodiment.

[Embodiment 4]
FIG. 9 is an overall block diagram of a vehicle according to the fourth embodiment. Referring to FIG. 9, in this vehicle 100C, in the configuration of vehicle 100 according to the first embodiment shown in FIG. 1, power line PL1 is replaced by neutral point N2 of second motor generator MG2, and second motor generator MG2 It is connected to the non-neutral point side of U-phase coil U2. The other configuration of vehicle 100C is the same as that of vehicle 100 according to the first embodiment shown in FIG.

  In vehicle 100C, when power storage device B is charged from external power source 70, full-wave rectifier circuit 40 is connected to power line PL2, W-phase coil W2 and U-phase coil U2 of second motor generator MG2, power line PL1, first motor generator MG1. An electric circuit to the first inverter 10 is formed through the neutral point N1 and the U-phase coil U1 in sequence, and the power storage device B is charged by the first inverter 10. Therefore, when charging power storage device B from external power supply 70, the three coils of W-phase coil W2 and U-phase coil U2 of second motor generator MG2 and U-phase coil U1 of first motor generator MG1 are used as a smoothing reactor. .

  As described above, in the fourth embodiment, when charging power storage device B from external power supply 70, three-phase coils connected in series can be used as a smoothing reactor. Therefore, the effect similar to that of the first embodiment can be obtained also by the fourth embodiment.

[Embodiment 5]
FIG. 10 is an overall block diagram of a vehicle according to the fifth embodiment. Referring to FIG. 10, in this vehicle 100D, in the configuration of vehicle 100C according to the fourth embodiment shown in FIG. 9, power line PL2 is replaced with the non-neutral point side of W-phase coil W2 of second motor generator MG2. Connected to neutral point N2 of second motor generator MG2. The other configuration of vehicle 100D is the same as that of vehicle 100C according to the fourth embodiment shown in FIG.

  In vehicle 100D, when power storage device B is charged from external power supply 70, full-wave rectifier circuit 40 outputs power line PL2, neutral point N2 of second motor generator MG2, U-phase coil U2, power line PL1, and first motor generator. An electric circuit to the first inverter 10 is formed through the U-phase coil U1 of the MG1 in sequence, and the power storage device B is charged by the first inverter 10. Therefore, when charging power storage device B from external power supply 70, the two coils of U-phase coil U2 of second motor generator MG2 and U-phase coil U1 of first motor generator MG1 are used as a smoothing reactor.

  As described above, in the fifth embodiment, when the power storage device B is charged from the external power supply 70, the two-phase coils connected in series can be used as a smoothing reactor. Therefore, the effect similar to that of the first embodiment can be obtained also by the fifth embodiment.

[Embodiment 6]
FIG. 11 is an overall block diagram of a vehicle according to the sixth embodiment. Referring to FIG. 11, in this vehicle 100E, in the configuration of vehicle 100A according to the second embodiment shown in FIG. 6, power line PL2 is replaced with the non-neutral point side of W-phase coil W2 of second motor generator MG2. Connected to neutral point N2 of second motor generator MG2. The other configuration of vehicle 100E is the same as that of vehicle 100A according to the second embodiment shown in FIG.

  In vehicle 100E, when power storage device B is charged from external power supply 70, full-wave rectifier circuit 40 is connected to power line PL2, neutral point N2 of second motor generator MG2, U-phase coil U2, power line PL1, and first motor generator. An electric circuit to the first inverter 10 is formed through the U-phase coil U1 and the V-phase coil V1 of the MG1 in sequence, and the power storage device B is charged by the first inverter 10. Therefore, when charging power storage device B from external power supply 70, U-phase coil U2 of second motor generator MG2 and three coils of U-phase coil U1 and V-phase coil V1 of first motor generator MG1 are used as a smoothing reactor. .

  As described above, in the sixth embodiment, when the power storage device B is charged from the external power supply 70, the coils for three phases connected in series can be used as a smoothing reactor. Therefore, the effect similar to that of the first embodiment can be obtained by the sixth embodiment.

[Embodiment 7]
FIG. 12 is an overall block diagram of a vehicle according to the seventh embodiment. Referring to FIG. 12, this vehicle 100 </ b> F does not include full-wave rectifier circuit 40 and further includes a rectifier circuit 80 in the configuration of vehicle 100 according to the first embodiment shown in FIG. 1. The rectifier circuit 80 is connected between the positive line MPL and the negative line MNL. The rectifier circuit 80 includes diodes D31 and D32. The anode of the diode D31 is connected to the cathode of the diode D32, the cathode of the diode D31 is connected to the positive line MPL, and the anode of the diode D32 is connected to the negative line MNL. Power line PL3 is connected to an intermediate tap of rectifier circuit 80, that is, a connection node between diodes D31 and D32. Power lines PL2 and PL3 are connected to charging port 50.

  Also in the seventh embodiment, a circuit is formed between external power supply 70 and power storage device B, and power storage device B can be charged from external power supply 70. Since first motor generator MG1 and second motor generator MG2 and power lines PL1 and PL2 are connected in the same manner as in vehicle 100 according to the first embodiment, this seventh embodiment is the same as in the first embodiment. The effect is obtained.

  Although not particularly illustrated, the second to sixth embodiments may include a rectifier circuit 80 instead of the full-wave rectifier circuit 40.

  In the first, fourth, and fifth embodiments, the power line PL1 is connected to the neutral point N1 of the first motor generator MG1, and only the U-phase arm 12 of the first inverter 10 is switched. Instead of the U-phase arm 12, the V-phase arm 14 or the W-phase arm 16 may be switched, or all the phase arms of the first inverter 10 may be switched simultaneously.

  In the second, third, and sixth embodiments described above, power line PL1 is connected to the non-neutral point side of U-phase coil U1 of first motor generator MG1, and only V-phase arm 14 of first inverter 10 is switching-controlled. However, instead of the V-phase arm 14, the W-phase arm 16 may be subjected to switching control, or both the V-phase arm 14 and the W-phase arm 16 may be subjected to switching control simultaneously. Further, for connection between first motor generator MG1 and power line PL1, power line PL1 is connected to the non-neutral point side of V-phase coil V1 or W-phase coil W1 instead of the non-neutral point side of U-phase coil U1. When power line PL1 is connected to V-phase coil V1, switching control is performed on at least one of U-phase arm 12 and W-phase arm 16, and the other-phase arm is stopped, and power line PL1 is connected to W-phase coil W1. In this case, at least one of the U-phase arm 12 and the V-phase arm 14 may be subjected to switching control and the other-phase arm may be stopped.

  In Embodiments 2 and 4, power line PL1 is connected to the non-neutral point side of U-phase coil U2 of second motor generator MG2. However, non-neutral point of U-phase coil U2 is used. Instead of the power line PL1, the power line PL1 may be connected to the non-neutral point side of the V-phase coil V2.

  In Embodiments 5 and 6, power line PL1 is connected to the non-neutral point side of U-phase coil U2 of second motor generator MG2. However, non-neutral point of U-phase coil U2 is used. Instead of the side, power line PL1 may be connected to the non-neutral point side of V-phase coil V2 or W-phase coil W2.

  In each of the above embodiments, the full-wave rectifier circuit 40 is connected to the motor generator (second motor generator MG2) having a relatively large ground capacity. The full-wave rectifier circuit 40 may be connected to the generator, and the power line PL1 may be connected to the neutral point of the motor generator having a relatively large leakage inductance, and all the phases of the inverter corresponding to the motor generator may be simultaneously switched. Specifically, in the first, fourth, and fifth embodiments in which power line PL1 is connected to neutral point N1 of first motor generator MG1, the leakage inductance of first motor generator MG1 is the leakage of second motor generator MG2. This is larger than the inductance, and corresponds to the case where all the phase arms of the first inverter 10 are simultaneously controlled to be switched when the power storage device B is charged from the external power source 70. Thereby, when charging power storage device B from external power supply 70, loss can be reduced while securing inductance in first motor generator MG1.

  In each of the above embodiments, a boost converter that can adjust the inverter input voltage to a predetermined value equal to or higher than the voltage of power storage device B may be provided between power storage device B and inverters 10 and 20. For example, a known DC chopper circuit can be used as such a boost converter.

  In the above, first inverter 10 and second inverter 20 correspond to "second inverter" and "first inverter" in the present invention, respectively, and first motor generator MG1 and second motor generator MG2 are These correspond to the “second AC rotating electric machine” and the “second AC rotating electric machine” in the present invention, respectively. In addition, charging port 50, full-wave rectifier circuit 40, and power lines PL2 and PL3 in the first to sixth embodiments form a “connection device” in the present invention. Furthermore, charging port 50, power lines PL2 and PL3, and rectifier circuit 80 in the seventh embodiment also form the “connecting device” in the present invention. Further, power line PL1 corresponds to “power line” in the present invention, and ECUs 30 and 30A correspond to “control device” in the present invention. Furthermore, power lines PL2 and PL3 correspond to “first power line” and “second power line” in the present invention, respectively.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and is intended to include meanings equivalent to the scope of claims for patent and all modifications within the scope.

1 is an overall block diagram of a vehicle according to a first embodiment of the present invention. FIG. 2 is an equivalent circuit diagram of the system shown in FIG. 1 when the power storage device is charged from an external power source. It is a functional block diagram of ECU shown in FIG. It is the figure which showed the operation | movement waveform of each phase arm of the 1st and 2nd inverter at the time of charge of an electrical storage apparatus from an external power supply. FIG. 11 is a diagram showing operation waveforms of each phase arm of the first and second inverters when charging the power storage device from the external power supply in the modification of the first embodiment. FIG. 6 is an overall block diagram of a vehicle according to a second embodiment. FIG. 10 is a diagram showing operation waveforms of respective phase arms of first and second inverters when charging a power storage device from an external power supply in the second embodiment. FIG. 6 is an overall block diagram of a vehicle according to a third embodiment. FIG. 10 is an overall block diagram of a vehicle according to a fourth embodiment. FIG. 10 is an overall block diagram of a vehicle according to a fifth embodiment. FIG. 10 is an overall block diagram of a vehicle according to a sixth embodiment. FIG. 10 is an overall block diagram of a vehicle according to a seventh embodiment.

Explanation of symbols

  10, 20 Inverter, 12, 22 U-phase arm, 14, 24 V-phase arm, 16, 26 W-phase arm, 30, 30A ECU, 32, 34 Inverter controller, 36 Charge controller, 40 Full-wave rectifier circuit, 50 Charging port, 60 relay, 70 external power supply, 80 rectifier circuit, 92 chassis ground, 100-100F vehicle, B power storage device, MPL positive line, MNL negative line, T11-T16, T21-216 switching element, D11-D16, D21-D26, D31, D32, D41-D44 Diode, MG1, MG2 Motor generator, N1, N2 Neutral point, DW wheel, PL1-PL3 Power line, Lmg1, Lmg2 Inductance, Cmg1, Cmg2 Motor ground capacity.

Claims (12)

A charging system for charging a power storage device connected to an electric load device mounted on a vehicle from a power source outside the vehicle, wherein the electric load device includes a first inverter and a second inverter connected in parallel to each other and the first And first and second AC rotating electric machines driven by the second inverter,
A connection device configured to connect one end of the power source to a winding of the first AC rotating electrical machine and to connect the other end of the power source to a DC line of the electric load device;
A power line for connecting in series the winding of the first AC rotating electrical machine and the winding of the second AC rotating electrical machine;
A charging system comprising: a control device that stops the first inverter and switches and controls at least one phase of the second inverter when the power storage device is charged from the power source.   The charging system according to claim 1, wherein a ground capacity of the first AC rotating electric machine is larger than a ground capacity of the second AC rotating electric machine. The leakage inductance of the second AC rotating electric machine is larger than the leakage inductance of the first AC rotating electric machine,
2. The charging system according to claim 1, wherein when the power storage device is charged from the power source, the control device stops the first inverter and simultaneously controls switching of all the phase arms of the second inverter. The power source is an AC power source,
The connecting device is
A rectifying circuit for rectifying AC power from the AC power source;
A first power line connecting one of the output ends of the rectifier circuit to a winding of the first AC rotating electric machine;
4. The charging system according to claim 1, further comprising: a second power line that connects the other output terminal of the rectifier circuit to a negative electrode line of the electric load device. 5. The power source is an AC power source,
The connecting device is
A first power line connecting one end of the AC power source to the winding of the first AC rotating electrical machine;
A rectifier circuit connected in parallel to the first and second inverters;
The charging system according to claim 1, further comprising: a second power line that connects the other end of the AC power supply to the rectifier circuit. Each of the first and second AC rotating electric machines includes a star-connected multiphase winding as a stator winding,
The connection device connects the power source to a non-neutral point side of any winding in the multiphase winding of the first AC rotating electric machine,
The power line is disposed between a neutral point of the multiphase winding of the first AC rotating electric machine and a neutral point of the multiphase winding of the second AC rotating electric machine. The charging system according to claim 5. Each of the first and second AC rotating electric machines includes a star-connected multiphase winding as a stator winding,
The connection device connects the power source to a non-neutral point side of any winding in the multiphase winding of the first AC rotating electric machine,
The power line is either a non-neutral point of a winding different from a winding to which the power supply is connected in the first AC rotating electric machine or any one of the multiphase windings of the second AC rotating electric machine. Between the non-neutral point side of
The control device performs switching control of at least one of phases different from a winding to which the power line is connected in the second AC rotating electric machine for the second inverter when the power storage device is charged from the power source. The charging system according to any one of claims 1 to 5. Each of the first and second AC rotating electric machines includes a star-connected multiphase winding as a stator winding,
The connection device connects the power source to a non-neutral point side of any winding in the multiphase winding of the first AC rotating electric machine,
The power line is arranged between a neutral point of the multiphase winding of the first AC rotating electrical machine and a non-neutral point side of any winding in the multiphase winding of the second AC rotating electrical machine. Established,
The control device performs switching control of at least one of phases different from a winding to which the power line is connected in the second AC rotating electric machine for the second inverter when the power storage device is charged from the power source. The charging system according to any one of claims 1 to 5. Each of the first and second AC rotating electric machines includes a star-connected multiphase winding as a stator winding,
The connection device connects the power source to a non-neutral point side of any winding in the multiphase winding of the first AC rotating electric machine,
The power line includes a non-neutral point side of a winding different from a winding to which the power source is connected in the first AC rotating electric machine and a neutral point of a multiphase winding of the second AC rotating electric machine. The charging system according to claim 1, wherein the charging system is disposed between the charging systems. Each of the first and second AC rotating electric machines includes a star-connected multiphase winding as a stator winding,
The connection device connects the power source to a neutral point of the multiphase winding of the first AC rotating electric machine,
The power line is arranged between a non-neutral point side of one of the multiphase windings of the first AC rotating electrical machine and a neutral point of the multiphase winding of the second AC rotating electrical machine. The charging system according to claim 1, wherein the charging system is provided. Each of the first and second AC rotating electric machines includes a star-connected multiphase winding as a stator winding,
The connection device connects the power source to a neutral point of the multiphase winding of the first AC rotating electric machine,
The power line includes a non-neutral point side of any winding in the multi-phase winding of the first AC rotating electrical machine and a non-medium winding of any winding in the multi-phase winding of the second AC rotating electrical machine. It is arranged between the sex point side,
The control device performs switching control of at least one of phases different from a winding to which the power line is connected in the second AC rotating electric machine for the second inverter when the power storage device is charged from the power source. The charging system according to any one of claims 1 to 5. A wheel that receives a driving torque from at least one of the first and second AC rotating electric machines;
A vehicle comprising the charging system according to any one of claims 1 to 11.

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