Power and Charging Systems

Abstract

This prevents an overcurrent from flowing through components of the first charging path, which serves as a path for a current that charges the first battery. [Solution] During parallel charging in which a first battery and a second battery are charged using power from a charging facility, a control device is provided that sets the minimum value of the first allowable input power of the first battery and the second allowable input power of the second battery as the common required power of the first battery and the total required power based on the common required power, requests the total required power or the total required current based on the total required power from the charging facility, and controls the first inverter and the second inverter using the common required power or a current command for the second battery based on the common required power, and when the difference between the common required power and the charging power of the second battery or the difference between the current command for the second battery and the charging current of the second battery is greater than or equal to a predetermined value, requests the charging facility to stop parallel charging.

Description

[Technical Field]

[0001] The present disclosure relates to a power supply system and a charging system. [Background technology]

[0002] A power supply system has been proposed that includes a storage battery device having first and second batteries and a switching relay that can switch between a first state in which the batteries are connected in series and a second state in which the batteries are connected in parallel, and an inlet connected to positive and negative wires that connect the storage battery device to a PCU that drives a motor (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-118221 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, power supply systems have been devised that include first and second batteries and a charging connector, and that are capable of parallel charging, in which the first and second batteries are charged via the first and second charging paths using power from a charging facility connected to the charging connector.In such power supply systems, if the second charging path is interrupted during parallel charging, power from the charging facility will be concentrated in the first charging path, causing an overcurrent to flow in components in the first charging path, such as the switching relay.

[0005] The power supply system and charging system of the present disclosure have a primary objective of preventing overcurrent from flowing through components of the first charging path, which serves as a path of current for charging the first battery. [Means for solving the problem]

[0006] The power supply system of the present disclosure employs the following measures to achieve the above-mentioned main object.

[0007] The power supply system of the present disclosure comprises: A power supply system including a first battery and a second battery, a motor having a three-phase coil; a first inverter connected to the first battery via a first positive line and a negative line and connected to one end of the three-phase coil; a second inverter connected to the second battery via a second positive line and the negative line and connected to the other end of the three-phase coil; a charging connector connected to the first positive electrode line and the negative electrode line and electrically connectable to a charging device; a control device that, during parallel charging in which the first battery and the second battery are charged using power from the charging equipment, sets a common required power for the first battery and the second battery to a minimum value of a first allowable input power of the first battery and a second allowable input power of the second battery, sets an overall required power based on the common required power, requests the charging equipment to provide the overall required power or an overall required current based on the overall required power, and controls the first inverter and the second inverter using the common required power or a current command for the second battery based on the common required power; Equipped with The control device requests the charging equipment to stop the parallel charging when a difference between the common required power and the charging power of the second battery or a difference between the current command for the second battery and the charging current of the second battery is equal to or greater than a predetermined value. The gist of this is as follows.

[0008] In the power supply system disclosed herein, during parallel charging in which a first battery and a second battery are charged using power from a charging facility, the system sets the common required power for the first battery and the minimum of the first allowable input power for the second battery and the second allowable input power for the second battery as the common required power, sets the total required power based on the common required power, requests the charging facility to provide the total required power or the total required current based on the total required power, and controls the first inverter and the second inverter using the common required power or a current command for the second battery based on the common required power. When the difference between the common required power and the charging power of the second battery or the difference between the current command for the second battery and the charging current of the second battery is equal to or greater than a predetermined value, the system requests the charging facility to stop parallel charging. As a result, overcurrent can be prevented from flowing through components of the first charging path, which is the path of current that charges the first battery, during parallel charging. Here, the predetermined value is a threshold value for determining whether the second charging path, which is the path of current that charges the second battery, is interrupted.

[0009] In such a power supply system of the present disclosure, when the parallel charging is stopped, the control device may set the total required power or the total required current to a value of 0. This allows the parallel charging to be stopped more appropriately.

[0010] Furthermore, in the power supply system of the present disclosure, the control device may set a first corrected required power for the first battery by performing feedback correction based on the difference between the common required power and the charging power of the first battery, and set a second corrected required power for the second battery by performing feedback correction based on the difference between the common required power and the charging power of the second battery, and set the sum of the first corrected required power and the second corrected required power as the total required power. In this way, when feedback correction is performed based on the difference between the common required power and the charging power of the first battery during parallel charging, it is possible to avoid overcurrent flowing through components in the first charging path.

[0011] Furthermore, in the power supply system of the present disclosure, the control device may set the total required power to twice the common required power, thereby enabling the total required power to be set more appropriately.

[0012] The charging system of the present disclosure comprises: The power supply system of the present disclosure according to any of the above aspects, i.e., basically, comprises a first inverter connected to the first battery via a first positive line and a negative line and connected to one end of the three-phase coil, a second inverter connected to the second battery via a second positive line and the negative line and connected to the other end of the three-phase coil, a charging connector connected to the first positive line and the negative line and electrically connectable to a charging facility, and a power supply system for charging the first battery and the second battery in parallel using power from the charging facility, the power supply system comprising: a first allowable input power of the first battery and a second allowable input power of the second battery; a control device that sets a minimum value as a common required power for the first battery and the second battery, sets an overall required power based on the common required power, requests the charging equipment to provide the overall required power or an overall required current based on the overall required power, and controls the first inverter and the second inverter using the common required power or a current command for the second battery based on the common required power, wherein the control device requests the charging equipment to stop the parallel charging when a difference between the common required power and the charging power of the second battery or a difference between the current command for the second battery and the charging current of the second battery is equal to or greater than a predetermined value; The charging facility; Equipped with The charging facility includes a power supply device that supplies power from an external power source to the power supply system, and a power supply control device that controls the power supply device so as to supply the requested total requested power or the total requested current to the power supply system. The gist of this is as follows.

[0013] The charging system of the present disclosure is equipped with any of the above-described aspects of the power supply system of the present disclosure, and therefore achieves effects similar to those achieved by the power supply system of the present disclosure, such as the effect of avoiding overcurrent flowing through components of the first charging path, which serves as the path of current for charging the first battery during parallel charging. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a schematic configuration diagram of a charging system 1 including a power supply system 10 and a charging stand 80 according to an embodiment of the present disclosure. [Figure 2] FIG. 4 is an explanatory diagram showing the flow of current during parallel charging. [Figure 3] 4 is a flowchart showing an example of a processing routine executed by a system ECU 50. [Figure 4] 3 is an explanatory diagram showing the current flow when the second charging path indicated by the thick dashed line with an arrow in FIG. 2 is interrupted for some reason during parallel charging. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] An embodiment of the present disclosure will be described with reference to the drawings. Fig. 1 is a schematic configuration diagram of a charging system 1 including a power supply system 10 and a charging stand (charging facility) 80 according to an embodiment of the present disclosure. The charging system 1 includes the power supply system 10 and the charging stand 80.

[0016] The power supply system 10 is mounted on an electric vehicle or a hybrid vehicle, and includes a battery 12, a motor 20, a first inverter 22, a second inverter 24, a switching circuit 30, a charging circuit 40, and a system electronic control unit (hereinafter referred to as "system ECU") 50 as a control device. The power supply system 10 is capable of charging the battery 12 using electric power from a charging stand 80 installed at a home, a charging station, or the like.

[0017] The battery 12 includes a first battery 13 and a second battery 14 as a first cell and a second battery. The first battery 13 and the second battery 14 are configured as, for example, lithium-ion secondary batteries or nickel-metal hydride secondary batteries whose rated voltages are slightly lower than the first voltage Vs1 (e.g., 400 V), respectively. In this embodiment, the first battery 13 and the second battery 14 have the same specifications. The positive terminal of the first battery 13 is connected to a first positive line 31, and the negative terminal of the second battery 14 is connected to a negative line 33. The negative terminal of the first battery 13 is connected to the positive terminal of the second battery 14 via a series line 35. A series relay Rs is attached to the series line 35. Therefore, by turning on the series relay Rs, the first battery 13 and the second battery 14 are connected in series to each other.

[0018] The motor 20 is configured as a three-phase AC motor having, for example, a rotor with a permanent magnet embedded in a rotor core and a stator with three-phase (U-phase, V-phase, W-phase) coils wound around a stator core. The first inverter 22 includes six transistors T11 to T16 as switching elements and six diodes D11 to D16 connected in parallel to the six transistors T11 to T16, respectively. The transistors T11 to T16 are arranged in pairs, two at a time, on the source side and two at the sink side of a first positive line 31 and a negative line 33. Each of the connection points of two transistors in a pair of the transistors T11 to T16 is connected to one end of the three-phase (U-phase, V-phase, W-phase) coils of the motor 20. A first smoothing capacitor 26 is connected to the first positive line 31 and the negative line 33. Like the first inverter 22, the second inverter 24 includes six transistors T21 to T26 as switching elements and six diodes D21 to D26. The transistors T21 to T26 are arranged in pairs, two at a time, on the source side and two at the sink side of a second positive line 32 and a negative line 33. The connection points of two transistors in each pair of the transistors T21 to T26 are connected to the other ends of the three-phase (U-phase, V-phase, W-phase) coils of the motor 20. A second smoothing capacitor 28 is connected to the second positive line 32 and the negative line 33. Hereinafter, the transistors T11 to T13 and T21 to T23 of the first and second inverters 22 and 24 may be referred to as the "upper arm," and the transistors T14 to T16 and T24 to T26 may be referred to as the "lower arm."

[0019] The switching circuit 30 includes a parallel line 36, a first parallel relay Rp1, and a second parallel relay Rp2 in addition to the first positive line 31, second positive line 32, negative line 33, series line 35, and series relay Rs described above. The parallel line 36 connects the negative terminal of the first battery 13 to the negative line 33. The first parallel relay Rp1 is attached to the parallel line 36. The second parallel relay Rp2 is attached to the second positive line 32.

[0020] The charging circuit 40 includes a charging line 42 connected to the first positive electrode line 31 and the negative electrode line 33, and a charging connector 44 connected to the charging line 42. The charging connector 44 is configured to be connectable to a stand connector 82 of the charging stand 80.

[0021] The system ECU 50 includes a microcomputer having a CPU, ROM, RAM, flash memory, input / output ports, and communication ports, various drive circuits, and various logic ICs. The system ECU 50 receives signals from various sensors, including a voltage sensor 13v that detects the voltage Vb1 of the first battery 13, a temperature sensor 13t that detects the temperature Tb1 of the first battery 13, a voltage sensor 14v that detects the voltage Vb2 of the second battery 14, and a temperature sensor 14t that detects the temperature Tb2 of the second battery 14. Other sensors include a rotational position sensor 20a that detects the rotational position of the rotor of the motor 20, current sensors 20u, 20v, and 20w that detect currents Iu, Iv, and Iw flowing through the respective phases (U-phase, V-phase, and W-phase) of the motor 20, a voltage sensor 26v that detects the voltage VH of the first capacitor 26, and a voltage sensor 28v that detects the voltage VL of the second capacitor 28. Further examples include a current sensor 31i that detects a current Ip1 flowing through the first positive line 31 and a current sensor 32i that detects a current Ip2 flowing through the second positive line 32. When the series relay Rs is in the OFF state and the first parallel relay Rp1 and the second parallel relay Rp2 are in the ON state, that is, when the first battery 13 is connected to the first positive line 31 and the negative line 33 and the second battery 14 is connected to the second positive line 32 and the negative line 33, the current Ip1 flowing through the first positive line 31 is equal to the current flowing through the first battery 13, and the current Ip2 flowing through the second positive line 32 is equal to the current flowing through the second battery 14. Furthermore, when the series relay Rs is in the on state and the first parallel relay Rp1 and the second parallel relay Rp2 are in the off state, i.e., when the first battery 13 and the second battery 14 are connected in series, the current Ip1 flowing through the first positive line 31 is equal to the current flowing through the first battery 13 and the second battery 14.

[0022] The system ECU 50 calculates the power storage percentages SOC1, SOC2, open circuit voltages OCV1, OCV2, and allowable input powers (first and second allowable input powers) Win1, Win2 of the first battery 13 and the second battery 14. The power storage percentages SOC1, SOC2 are calculated based on, for example, the integrated value of the current Ip1 (current flowing to the first battery 13) flowing through the first positive line 31 and the integrated value of the current Ip2 (current flowing to the second battery 14) flowing through the second positive line 32 when the series relay Rs is in the OFF state and the first parallel relay Rp1 and the second parallel relay Rp2 are in the ON state, and the integrated value of the current Ip1 (current flowing to the first battery 13 and the second battery 14) flowing through the first positive line 31 when the series relay Rs is in the ON state and the first parallel relay Rp1 and the second parallel relay Rp2 are in the OFF state. The open circuit voltages OCV1, OCV2 are derived, for example, by applying the power storage rates SOC1, SOC2 to a map that is determined in advance by experiments, analysis, machine learning, etc. as the relationship between the power storage rates SOC1, SOC2 and the open circuit voltages OCV1, OCV2. The allowable input powers Win1, Win2 are derived, for example, by applying the power storage rates SOC1, SOC2 and the temperatures Tb1, Tb2 to a map that is determined in advance by experiments, analysis, machine learning, etc. as the relationship between the power storage rates SOC1, SOC2, the temperatures Tb1, Tb2, and the allowable input powers Win1, Win2.

[0023] The system ECU 50 outputs control signals to the first and second inverters 22, 24 and control signals to each relay. The relays include a series relay Rs, a first parallel relay Rp1, and a second parallel relay Rp2. The system ECU 50 is capable of communicating with a station electronic control unit (hereinafter referred to as "station ECU") 86 of the charging station 80.

[0024] The charging stand 80 includes a stand connector 82, a power supply device 84, and a stand ECU (power supply control device) 86. The stand connector 82 is configured to be connectable to the charging connector 44 of the power supply system 10. The power supply device 84 is connected to an AC power source (external power source) such as a household power source or a commercial power source, and is configured to convert AC power from the AC power source to DC power, adjust output power (output voltage and output current), and output the DC power to the stand connector 82. The stand ECU 86, like the system ECU 50, includes a microcomputer. Signals from various sensors are input to the stand ECU 86. Examples of the various sensors include a voltage sensor (not shown) that detects the output voltage Vs of the power supply device 84 and a current sensor (not shown) that detects the output current Is of the power supply device 84. The stand ECU 86 outputs a control signal to the power supply device 84. As described above, the stand ECU 86 is capable of communicating with the system ECU 50. Examples of charging stations 80 include a first voltage station where the voltage of the supplied power is a first voltage Vs1 (e.g., 400 V), a second voltage station where the voltage of the supplied power is a second voltage Vs2 (e.g., 800 V) that is higher than the first voltage Vs1, and a third voltage station where the voltage of the supplied power can be selectively set to either the first voltage Vs1 or the second voltage Vs2.

[0025] In the power supply system 10 of this embodiment configured as described above, when the vehicle is traveling using the motor 20 as a traction motor, the series relay Rs is turned on and the first parallel relay Rp1 and the second parallel relay Rp2 are turned off, thereby connecting the first battery 13 and the second battery 14 in series, and the motor 20 is driven by the first inverter 22 using power from the first battery 13 and the second battery 14.

[0026] In addition, in the power supply system 10, when the charging connector 44 and the stand connector 82 of the charging stand 80 are connected, the system ECU 50 selects parallel charging if the voltage of the power supplied by the charging stand 80 is a first voltage Vs1, and selects series charging if the voltage of the power supplied by the charging stand 80 is a second voltage Vs2.

[0027] In parallel charging, the first battery 13 and the second battery 14 are connected in parallel from the charging connector 44 by turning the series relay Rs off and turning the first parallel relay Rp1 and the second parallel relay Rp2 on, and the first battery 13 and the second battery 14 are charged using power from the charging stand 80. FIG. 2 is an explanatory diagram showing the flow of current during parallel charging. In the figure, a thick solid line with an arrow indicates the charging current of the first battery 13, and a thick dashed line with an arrow indicates the charging current of the second battery 14. In parallel charging, the first battery 13 is charged by current along a first charging path that flows in this order from the charging connector 44 to the positive line of the charging line 42, the first positive line 31, the first battery 13, the parallel line 36 (first parallel relay Rp1), the negative line 33, the negative line of the charging line 42, and the charging connector 44, as shown by the thick solid line with an arrow in FIG. 2. 2, the second battery 14 is charged by a current through a second charging path that flows in this order from the charging connector 44 to the positive line of the charging line 42, the first positive line 31, the first inverter 22, the motor 20, the second inverter 24, the second positive line 32 (second parallel relay Rp2), the second battery 14, the negative line 33, the negative line of the charging line 42, and the charging connector 44. At this time, by fixing the upper arm of the second inverter 24 to ON (fixing the lower arm to OFF) and executing step-down control that duty-controls the upper arm and lower arm of the first inverter 22, the motor 20 and the first inverter 22 function as a three-phase step-down converter, and the input power of the first inverter 22 is stepped down and output from the motor 20. In addition, by fixing the upper arm of the first inverter 22 on (fixing the lower arm off) and performing boost control that duty controls the upper arm and lower arm of the second inverter 24, the motor 20 and the second inverter 24 function as a three-phase boost converter, and the input power of the motor 20 is boosted and output from the second inverter 24.

[0028] In series charging, the first battery 13 and the second battery 14 are connected in series by turning on the series relay Rs and turning off the first parallel relay Rp1 and the second parallel relay Rp2, and the first battery 13 and the second battery 14 are charged using power from the charging stand 80. In series charging, the first battery 13 and the second battery 14 are charged by current that flows from the charging connector 44 through the positive line of the charging line 42, the first positive line 31, the first battery 13, the series line 35 (series relay Rs), the second battery 14, the negative line 33, the negative line of the charging line 42, and the charging connector 44 in this order.

[0029] Next, the operation of the charging system 1 of this embodiment, particularly the operation during parallel charging in the power supply system 10, will be described. Fig. 3 is a flowchart showing an example of a processing routine executed by the system ECU 50. This routine is executed repeatedly during parallel charging. Before the repeated execution of this routine begins, the series relay Rs is set to the OFF state, and the first parallel relay Rp1 and the second parallel relay Rp2 are set to the ON state.

[0030] When this routine is executed, the system ECU 50 first executes a process of inputting a current Ip2 (S100). The current Ip2 is input as a value detected by the current sensor 32i. Next, the system ECU 50 sets the minimum value of the allowable input powers Win1 and Win2 of the first and second batteries 13 and 14 as a common required power Pb*, which is a required power common to the first and second batteries 13 and 14 (step S110). Next, the system ECU 50 sets a corrected required power Pb1* of the first battery 13 (first corrected required power) through feedback correction to cancel out the difference between the common required power Pb* and the charging power Pb1 of the first battery 13 (step S120), and sets a corrected required power Pb2* of the second battery 14 (second corrected required power) through feedback correction to cancel out the difference between the common required power Pb* and the charging power Pb2 ​​of the second battery 14 (step S130). Here, the charging power Pb1 of the first and second batteries 13, 14 is calculated, for example, by multiplying the voltage Vb1 of the first and second batteries 13, 14 by the currents Ib1, Ib2 (currents Ip1, Ip2 flowing through the first and second positive electrode lines 31, 32).

[0031] Then, a current command Ib2* for the second battery 14 is set based on the corrected required power Pb2* (step S140), and a determination is made as to whether the difference between the current command Ib2* and the current Ip2 input in S100 (=Ib2*-Ip2), i.e., the difference between the current command Ib2* and the charging current of the second battery 14, is equal to or greater than a predetermined value Ibref (S150). The predetermined value Ibref is a threshold value for determining whether the second charging path, indicated by the bold dashed line in FIG. 2, is interrupted. This is based on the fact that, when the second charging path is not interrupted, the current Ip2 and the current command Ib2* become equal in S180 (described later), and the difference between the current command Ib2* and the current Ip2 input in S100 becomes zero. However, when the second charging path is interrupted, the current Ip2 becomes zero, and the difference between the current Ip2 and the current command Ib2* becomes large. Therefore, S150 is a process for determining whether the second charging path is interrupted.

[0032] When the difference between the current command Ib2* and the current Ip2 is less than a predetermined value Ibref, it is determined that the second charging path is not interrupted, and the sum of the corrected required powers Pb1* and Pb2* of the first and second batteries 13, 14 is set as the total required power Pt* (step S160). The total required current It* is set based on the set total required power Pt* and transmitted to the stand ECU 86 of the charging stand 80 (step S170). The total required current It* is calculated, for example, by dividing the total required power Pt* by the output voltage Vs of the power supply device 84, or by dividing the total required power Pt* by the maximum value of the voltages Vb1 and Vb2 of the first and second batteries 13, 14. Upon receiving the total required current It*, the stand ECU 86 controls the power supply device 84 so that a current equivalent to the total required current It* is supplied from the charging stand 80 to the power supply system 10. Then, the first and second inverters 22, 24 are controlled based on the set current command Ib2* (step S180), and this routine ends. The current command Ib2* is calculated, for example, by dividing the corrected required power Pb2* by the voltage Vb2 of the second battery 14. Through this process, when the charging powers Pb1, Pb2 of the first and second batteries 13, 14 exceed the common required power Pb* (the minimum value of the allowable input powers Win1, Win2 of the first and second batteries 13, 14), the corrected required powers Pb1*, Pb2* of the first and second batteries 13, 14 become smaller than the common required power Pb*. As a result, the total required power Pt* becomes smaller than twice the common required power Pb*, and the power from the charging stand 80 becomes smaller. Therefore, the charging powers Pb1 and Pb2 of the first and second batteries 13 and 14 are prevented from continuing to exceed the allowable input powers Win1 and Win2.

[0033] If the difference between the current command Ib2* and the current Ip2 is equal to or greater than the predetermined value Ibref, the system determines that the second charging path is interrupted, sets the total required current It* to 0, and transmits this to the station ECU 86 of the charging station 80 (step S190). Upon receiving the total required current It*, the station ECU 86 controls the power supply device 84 so that a current equivalent to the total required current It* is supplied from the charging station 80 to the power supply system 10. Now that the total required current It* is set to 0, the station ECU 86 controls the power supply device 84 so that the supply of current from the charging station 80 to the power supply system 10 is stopped. Then, the system stops driving the first and second inverters 22, 24 (step S200), and ends this routine. Driving the first and second inverters 22, 24 is stopped by turning off all of the gates of the transistors T11-16 and T21-T26 of the first and second inverters 22, 24. This process stops parallel charging. 4 is an explanatory diagram showing the current flow during parallel charging when the second charging path, indicated by the thick dashed line with an arrow in FIG. 2, is interrupted for some reason. In the figure, the thick solid line with an arrow indicates the charging current supplied from the power supply device 84. If the second charging path is interrupted for some reason, current concentrates in the first charging path, indicated by the thick solid line with an arrow, causing an overcurrent to flow through components in the first charging path, such as the first parallel relay Rp1. In this embodiment, when the second charging path is interrupted, parallel charging is stopped, thereby preventing an overcurrent from flowing through components in the first charging path.

[0034] According to the charging system 1 of this embodiment described above, when the difference between the current command Ib2* and the current Ip2 of the second battery 14 is equal to or greater than a predetermined value Ibref, the charging stand 80 is requested to stop parallel charging, thereby preventing an overcurrent from flowing through the components of the first charging path.

[0035] Furthermore, when parallel charging is stopped, the total required current It* is set to 0, thereby enabling parallel charging to be stopped more appropriately.

[0036] Furthermore, by performing feedback correction based on the difference between the common required power Pb* and the charging power Pb1 of the first battery 13 to set the corrected required power Pb1* of the first battery 13, and by performing feedback correction based on the difference between the common required power Pb* and the charging power Pb2 ​​of the second battery 14 to set the corrected required power Pb2* of the second battery 14, and setting the sum of the corrected required power Pb1* and the corrected required power Pb2* to the total required power Pt*, the total required power Pt* can be set more appropriately.

[0037] In the above-described embodiment, when the difference between the current command Ib2* and the current Ip2 of the second battery 14 is equal to or greater than the predetermined value Ibref, the total required current It* is set to a value of 0 and transmitted to the stand ECU 86 of the charging stand 80. However, the total required power Pt* may be set to a value of 0, and the total required current It* may be set based on the set total required power Pt* and transmitted to the stand ECU 86 of the charging stand 80.

[0038] In the above-described embodiment, feedback correction is performed based on the difference between the common required power Pb* and the charging power Pb1 of the first battery 13 to set the corrected required power Pb1* of the first battery 13, and feedback correction is performed based on the difference between the common required power Pb* and the charging power Pb2 ​​of the second battery 14 to set the corrected required power Pb2* of the second battery 14, and the total required power Pt* is set as the sum of the corrected required power Pb1* and the corrected required power Pb2*. However, the total required power Pt* may also be set to twice the common required power Pb*. This allows the total required power Pt* to be set more appropriately.

[0039] The correspondence between the main elements of the embodiment and the main elements of the invention described in the "Summary" section will be described. In the embodiment, the first battery 13 corresponds to the "first battery," the second battery 14 corresponds to the "second battery," the motor 20 corresponds to the "motor," the first inverter 22 corresponds to the "first inverter," the second inverter 24 corresponds to the "second inverter," the charging connector 44 corresponds to the "charging connector," and the system ECU 50 corresponds to the "controller." In addition, the series line 35 corresponds to the "series line," the series relay Rs corresponds to the "series relay," the parallel line 36 corresponds to the "parallel line," the first parallel relay Rp1 corresponds to the "first parallel relay," and the second parallel relay Rp2 corresponds to the "second parallel relay."

[0040] The correspondence between the main elements of the embodiments and the main elements of the invention described in the "Means for Solving the Problem" section does not limit the elements of the invention described in the "Means for Solving the Problem" section, since the embodiments are examples for specifically explaining the mode for implementing the invention described in the "Means for Solving the Problem" section. In other words, the interpretation of the invention described in the "Means for Solving the Problem" section should be based on the description in that section, and the embodiments are merely specific examples of the invention described in the "Means for Solving the Problem" section.

[0041] The above describes embodiments for implementing the present disclosure, but the present disclosure is not limited to these embodiments and can, of course, be implemented in various forms within the scope that does not deviate from the gist of the present disclosure. [Industrial Applicability]

[0042] The present disclosure is applicable to industries such as the manufacturing of power supply systems and charging systems. [Explanation of symbols]

[0043] 1 Charging system, 10 Power supply system, 12 Battery, 13 First battery, 13v, 14v, 26v, 28v Voltage sensor, 13t, 14t Temperature sensor, 14 Second battery, 20 Motor, 20a Rotation position sensor, 20u, 20v, 20w, 31i, 32i Current sensor, 22 First inverter, 24 Second inverter, 26 First capacitor, 28 Second capacitor, 30 Switching circuit, 31 First positive line, 32 Second positive line, 33 Negative line, 35 Series line, 36 Parallel line, 40 Charging circuit, 42 Charging line, 44 Charging connector, 50 System ECU, 80 Charging stand, 82 Stand connector, 84 Power supply device, 86 Stand ECU, D11 to D16, D21 to D26 Diode, Rp1 First parallel relay, Rp2 Second parallel relay, Rs series relay, T11~T16, T21~T26 transistors.

Claims

1. A power supply system including a first battery and a second battery, a motor having a three-phase coil; a first inverter connected to the first battery via a first positive line and a negative line and connected to one end of the three-phase coil; a second inverter connected to the second battery via a second positive line and the negative line and connected to the other end of the three-phase coil; a charging connector connected to the first positive electrode line and the negative electrode line and electrically connectable to a charging device; a control device that, during parallel charging in which the first battery and the second battery are charged using power from the charging equipment, sets a common required power for the first battery and the second battery to a minimum value of a first allowable input power of the first battery and a second allowable input power of the second battery, sets a total required power based on the common required power, requests the charging equipment to provide the total required power or a total required current based on the total required power, and controls the first inverter and the second inverter using the common required power or a current command for the second battery based on the common required power; Equipped with The control device requests the charging equipment to stop the parallel charging when a difference between the common required power and the charging power of the second battery or a difference between the current command for the second battery and the charging current of the second battery is equal to or greater than a predetermined value. Power supply system.

2. 2. The power supply system of claim 1, When the parallel charging is stopped, the control device sets the total required power or the total required current to a value of 0. Power supply system.

3. 3. The power supply system according to claim 1, The control device performs feedback correction based on the difference between the common required power and the charging power of the first battery to set a first corrected required power of the first battery, performs feedback correction based on the difference between the common required power and the charging power of the second battery to set a second corrected required power of the second battery, and sets the sum of the first corrected required power and the second corrected required power as the total required power. Power supply system.

4. 3. The power supply system according to claim 1, The control device sets the total required power to twice the common required power. Power supply system.

5. The power supply system according to claim 1 or 2; The charging facility; Equipped with The charging facility includes a power supply device that supplies power from an external power source to the power supply system, and a power supply control device that controls the power supply device so as to supply the requested total requested power or the total requested current to the power supply system. Charging system.

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