In-vehicle backup control device

Abstract

The purpose of the present application is to reduce the load of an in-vehicle power supply system during a charging operation. An adjustment unit (11) of an in-vehicle backup control device (10) controls a first charging / discharging unit (52) corresponding to a first power storage unit (31) such that a charging current is supplied to the first power storage unit (31) in a first state during a first period (T1), and the first power storage unit (31) is charged at a constant voltage during a second period (T2) subsequent to the first period (T1). The adjustment unit (11) controls a second charging / discharging unit (62) corresponding to the second power storage unit (32) such that the second power storage unit (32) is in a second state in which the charging current is suppressed compared to the first state during the first period (T1), and supplies the charging current to the second power storage unit (32) in a third state in which the charging current is increased compared to the second state during the second period (T2).

Description

Technical Field

[0001] The present disclosure relates to a backup control device for a vehicle. Background Art

[0002] Patent Document 1 discloses a power storage device that supplies power to a load from a power storage unit that serves as a backup power source when the voltage of a main power source drops. The power storage device outputs a charging signal to a charging circuit when the vehicle starts to be used. When the charging circuit receives the charging signal, it charges the power of the main power source to the power storage unit.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2009-296808 Summary of the invention

[0006] Problems to be solved by the invention

[0007] In a power storage device such as Patent Document 1, it is considered to provide a plurality of power storage units as backup power supplies when it is desired to increase the redundancy of power supply to a load. However, if a charging current of the same magnitude as the charging current supplied to a single power storage unit as in the past is supplied to each of the plurality of power storage units, the load on the power storage device will increase.

[0008] An object of the present disclosure is to reduce the load on a vehicle-mounted power supply system during charging operation.

[0009] Means for solving problems

[0010] A vehicle-mounted backup control device as one of the present disclosures is used in a vehicle-mounted power supply system having a first power supply unit and a second power supply unit, and performs a backup action at least when the power supply from the first power supply unit to a load fails, the second power supply unit having a plurality of storage units, and the backup action is an action of supplying power to the load based on the power from the second power supply unit, wherein the vehicle-mounted backup control device comprises: a plurality of charging units that perform an action of supplying a charging current based on the power supplied from the first power supply unit; and an adjustment unit that controls the plurality of charging units, and each of the charging units performs an action of supplying a charging current to each of the storage units, The adjustment unit controls the charging unit corresponding to a part of the plurality of storage units by supplying a charging current to the part of the storage units in a first state during a first period, and performing constant voltage charging on the part of the storage units during a second period after the first period; and the adjustment unit controls the charging unit corresponding to the other storage units among the plurality of storage units that are different from the part of the storage units by supplying a charging current in a third state in which the charging current is increased compared to the second state during the second period.

[0011] Effects of the Invention

[0012] The technology disclosed in the present disclosure can reduce the load on the vehicle-mounted power supply system during charging operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] [ Figure 1 ] Figure 1 1 is a block diagram schematically illustrating an in-vehicle power supply system including the in-vehicle backup control device according to the first embodiment.

[0014] [ Figure 2 ] Figure 2 This is a flowchart illustrating the flow of control performed by the vehicle-mounted backup control device according to the first embodiment.

[0015] [ Figure 3 ] Figure 3 This is a flowchart illustrating the flow of standby control of the second power supply unit.

[0016] [ Figure 4 ] Figure 4 1 is a timing chart showing the charging voltages of the first power storage unit and the second power storage unit and the time changes of the charging voltages in the vehicle-mounted power supply system according to the first embodiment.

[0017] [ Figure 5 ] Figure 5 1 is a timing chart showing the charging voltages of the first power storage unit and the second power storage unit and the time changes of the charging voltages in the vehicle-mounted power supply system according to the second embodiment.

[0018] [ Figure 6 ] Figure 6 1 is a block diagram schematically illustrating an in-vehicle power supply system including an in-vehicle backup control device according to a third embodiment. DETAILED DESCRIPTION

[0019] The following lists and illustrates the embodiments of the present disclosure. In addition, the features [1] to [8] illustrated below can be combined arbitrarily within the range of no contradiction.

[0020] [1] A vehicle-mounted backup control device is used in a vehicle-mounted power supply system having a first power supply unit and a second power supply unit, and performs a backup operation at least when the power supply from the first power supply unit to the load fails, the second power supply unit having a plurality of power storage units, and the backup operation is an operation of supplying power to the load based on the power from the second power supply unit, wherein the vehicle-mounted backup control device comprises: a plurality of charging units, which perform an operation of supplying a charging current based on the power supplied from the first power supply unit; and a regulating unit, which controls the plurality of charging units, each of which performs an operation of supplying a charging current to each of the power storage units, The adjustment unit controls the charging unit corresponding to a part of the plurality of storage units in a manner that the charging current is supplied to the part of the storage units in a first state during a first period, and the part of the storage units is charged at a constant voltage during a second period after the first period; and the adjustment unit controls the charging unit corresponding to the other storage units among the plurality of storage units that are different from the part of the storage units in a manner that the other storage units are in a second state in which the charging current is suppressed compared to the first state during the first period, and the charging current is supplied in a third state in which the charging current is increased compared to the second state during the second period.

[0021] The vehicle-mounted backup control device of the above-mentioned [1] supplies charging current to a part of the plurality of storage units in a first state during a first period, and sets the other storage units different from the part of the storage units to a second state in which the charging current is suppressed compared to the first state. Therefore, during the first period, by suppressing the charging current to the other storage units, the load generated in the vehicle-mounted power supply system can be reduced. On the other hand, during the second period, by supplying charging current to the other storage units in a third state in which the charging current is increased compared to the second state, it is easy to ensure the supply amount of charging current to the other storage units. Therefore, the supply amount of charging current can be ensured for the plurality of storage units, and the load on the vehicle-mounted power supply system during the charging operation can be reduced.

[0022] [2] The vehicle-mounted backup control device described in [1] has the following feature: The adjustment unit controls the charging operation of the plurality of charging units so that the total value of the charging current to the plurality of power storage units is limited to within an allowable range.

[0023] The vehicle-mounted backup control device of the above-mentioned [2] can supply power from the first power supply unit so that the charging current is within the allowable range. Therefore, by appropriately setting the allowable range of the charging current, the load generated in the vehicle-mounted power supply system can be reduced.

[0024] [3] The vehicle-mounted backup control device described in [1] or [2] has the following features: the adjustment unit controls the charging unit corresponding to the part of the power storage units so that the part of the power storage units are charged with a constant current during the first period and charged with a constant voltage during the second period, and the adjustment unit controls the charging unit corresponding to the other power storage units so that the charging of the other power storage units is stopped during at least a part of the first period and the other power storage units are charged during the second period.

[0025] The vehicle-mounted backup control device of [3] above can reliably suppress the charging current of other power storage units in a part of the first period by stopping the charging of other power storage units in at least a part of the first period, thereby reducing the load generated in the vehicle-mounted power supply system.

[0026] [4] The vehicle-mounted backup control device described in [1] or [2] has the following features: the adjustment unit controls the charging unit corresponding to the part of the power storage units in such a manner that the part of the power storage units are charged with a constant current during a predetermined constant current period in the first period, and the part of the power storage units are charged with a constant voltage during the second period, and the adjustment unit performs constant current charging of the other power storage units in a state suppressed compared to the first state during at least a portion of the predetermined constant current period, and performs constant current charging with a charging current increased compared to the second state during at least a portion of the second period.

[0027] The vehicle-mounted backup control device of [4] above performs constant current charging of other power storage units in a state suppressed from the first state (the state of charging current of some power storage units) during a predetermined constant current period in the first period. Therefore, during at least a part of the period, the charging current of other power storage units can be suppressed to reduce the load generated in the vehicle-mounted power supply system, and a constant supply amount of charging current for other power storage units can be ensured.

[0028] [5] The vehicle-mounted backup control device described in [1] or [2] has the following features: the adjustment unit performs first constant current charging on the part of the power storage unit during a first constant current period in the first period, performs second constant current charging on the part of the power storage unit in a second constant current period after the first constant current period in the first period, wherein the current is suppressed compared to the first constant current charging, the adjustment unit stops charging the other power storage unit during the first constant current period, performs third constant current charging on the other power storage unit in the second constant current period, wherein the current is suppressed compared to the second constant current charging, and performs fourth constant current charging on at least a part of the second period, wherein the current is increased compared to the third constant current charging.

[0029] The vehicle-mounted backup control device of [5] above stops charging other power storage units during the first constant current period, thereby reducing the load on the vehicle-mounted power supply system. During the second constant current period, the other power storage units are also charged with a third constant current that suppresses the current compared to the second constant current charging, thereby reducing the load on the vehicle-mounted power supply system. During at least a portion of the second period, the fourth constant current charging that increases the current compared to the third constant current charging is performed, making it easy to ensure the supply of charging current to the other power storage units.

[0030] [6] The vehicle-mounted backup control device described in [5] has the following feature: the adjustment unit makes the charging current supplied to the other power storage units during the fourth constant current charging larger than the charging current supplied to the part of the power storage units during the second constant current charging.

[0031] The vehicle-mounted backup control device of [6] described above can make the charging voltage of the other power storage unit approach the target charging voltage more quickly during the fourth constant current charging.

[0032] [7] In the vehicle-mounted backup control device described in [1] to [6], there is the following feature. The load includes a first load and a second load different from the first load. A part of the plurality of charging units supplies a charging current to the part of the storage units. Another charging unit different from the part of the plurality of charging units supplies a charging current to the other storage units. The vehicle-mounted backup control device includes: a first discharge unit that supplies power to the first load based on the power supplied from the part of the storage units; and a second discharge unit that supplies power to the second load based on the power supplied from the other storage units. The first load is set as the load with a higher priority than the second load.

[0033] The vehicle-mounted backup control device of the above-mentioned [7] can charge the first load with a higher priority first based on the priority of the loads set in advance.

[0034] [8] The vehicle-mounted backup control device described in [7] has the following features: the adjustment unit supplies a charging current to the part of the power storage units in the first state during the first period, and when the charging voltage of the part of the power storage units reaches a threshold voltage, the adjustment unit shifts to the second period, and the adjustment unit supplies a charging current to the part of the power storage units that is suppressed in current compared to the first state during the second period, and increases the charging current to the other power storage units compared to the charging current supplied during the first period.

[0035] The vehicle-mounted backup control device of [8] can be triggered by the fact that the charging voltage of a part of the power storage unit reaches the threshold voltage during the first period, and can shift to the second period after ensuring sufficient charging voltage of the part of the power storage unit. In addition, in the second period, the other power storage units can be fully charged.

[0036] <First Embodiment>

[0037] [Configuration of an in-vehicle power supply system]

[0038] Figure 1 The vehicle-mounted power supply system 100 shown includes a first power supply unit 20, a second power supply unit 30, loads 41 and 42, and a vehicle-mounted backup control device 10. The vehicle-mounted backup control device 10 is also simply referred to as a backup control device 10.

[0039] The first power supply unit 20 functions as a main power supply that continuously supplies power when the vehicle equipped with the vehicle power supply system 100 is started. The first power supply unit 20 is a DC power supply that generates a DC voltage. The first power supply unit 20 is composed of a battery such as a lead battery. The terminal on the high potential side of the first power supply unit 20 is electrically connected to the power line 80, and the terminal on the low potential side of the first power supply unit 20 is electrically connected to the ground. The first power supply unit 20 applies a predetermined voltage to the power line 80. In addition, in this specification, unless otherwise specified, the voltage is a voltage based on the ground.

[0040] The first power supply unit 20 is electrically connected to the loads 41 and 42 via the power line 80. The power from the first power supply unit 20 is supplied to the loads 41 and 42 via the power line 80. Figure 1In the example of FIG. 1 , the power line 80 includes a power line 81A which is a conductive line directly connected to the first power supply unit 20, a power line 81B which is connected to the load 41, and a power line 81C which is a conductive line connected to the load 42. The power lines 81A, 81B, and 81C are electrically connected to each other. When power is supplied from the first power supply unit 20 to the loads 41 and 42, the power lines 81A, 81B, and 81C are set to the same potential. Relays, fuses, and the like, which are not shown in the figure, are provided on the power line 80, and these elements have the function of cutting off the conduction of the power line 80.

[0041] Loads 41 and 42 are vehicle-mounted electrical devices. Loads 41 and 42 are loads that are expected to be supplied with power when the power supply from the first power supply unit 20 stops in an abnormal state (failure state). Load 41 is equivalent to the "first load" of the present disclosure. Load 42 is equivalent to the "second load" of the present disclosure. The first load 41 is set as a load with a higher priority than the second load. Loads 41 and 42 may also be actuators such as electric motors. Alternatively, they may be ECUs or actuators in electric parking brake systems, ECUs or actuators in shift-by-wire control systems, etc. Alternatively, they may be vehicle-mounted electrical devices other than these.

[0042] The backup control device 10 includes an adjustment unit 11, a first charge and discharge unit 52, a first voltage detection unit 53, a second charge and discharge unit 62, and a second voltage detection unit 63. The adjustment unit 11 controls the first charge and discharge unit 52 and the second charge and discharge unit 62. The adjustment unit 11 includes an electronic control device 12, a first control unit 51, a first current detection unit 54, a second control unit 61, and a second current detection unit 64. The first charge and discharge unit 52 is equivalent to an example of a “charger” and a “first discharger” in the present disclosure. The second charge and discharge unit 62 is equivalent to an example of a “charger” and a “second discharger” in the present disclosure. The first control unit 51 and the second control unit 61 are equivalent to an example of a “control unit” in the present disclosure.

[0043] The electronic control device 12 is a control device different from the first control unit 51 and the second control unit 61. The electronic control device 12 is a control device not included in the first storage unit 101 and the second storage unit 102 described later. The electronic control device 12 is configured as an upper ECU (Electronic Control Unit) mounted on the vehicle, for example. The electronic control device 12 can communicate with the first control unit 51 and the second control unit 61. The electronic control device 12 controls the first control unit 51 and the second control unit 61.

[0044] The backup control device 10 is a device that can perform a backup operation to supply power to the loads 41 and 42 based on the power of the second power supply unit 30 (the first power storage unit 31 and the second power storage unit 32) when the power supply from the first power supply unit 20 to the loads 41 and 42 is cut off or reduced in a specified state (abnormal state).

[0045] The vehicle-mounted power supply system 100 includes a first power storage unit 101 and a second power storage unit 102. The first power storage unit 101 includes a first power storage unit 31, a first control unit 51, a first charge and discharge unit 52, a first voltage detection unit 53, and a first current detection unit 54. The second power storage unit 102 includes a second power storage unit 32, a second control unit 61, a second charge and discharge unit 62, a second voltage detection unit 63, and a second current detection unit 64.

[0046] The first power storage unit 31 and the second power storage unit 32 function as auxiliary power supplies. The first power storage unit 31 and the second power storage unit 32 are equivalent to an example of a "power storage unit" in the present disclosure. The first power storage unit 31 and the second power storage unit 32 are DC power supplies that output DC voltage, such as double-layer capacitors. The first power storage unit 31 is electrically connected to the first charge and discharge unit 52 described later via the conductive line 55, and is charged and discharged via the first charge and discharge unit 52. The charging voltage (output voltage) of the first power storage unit 31 is the voltage applied to the conductive line 55. The terminal on the high potential side of the first power storage unit 31 is electrically connected to the conductive line 55, and becomes the same potential as the conductive line 55. The terminal on the low potential side of the first power storage unit 31 is electrically connected to the ground, and becomes the same potential as the ground.

[0047] The second power storage unit 32 is electrically connected to a second charge and discharge unit 62 described later via a conductive line 65, and is charged and discharged via the second charge and discharge unit 62. The charging voltage (output voltage) of the second power storage unit 32 is a voltage applied to the conductive line 65. The terminal on the high potential side of the second power storage unit 32 is electrically connected to the conductive line 65 and has the same potential as the conductive line 65. The terminal on the low potential side of the second power storage unit 32 is electrically connected to the ground and has the same potential as the ground.

[0048] In the backup control device 10, in the stop state where the start switch of the vehicle equipped with the vehicle power supply system 100 is turned off, the charging voltage (output voltage) of the first power storage unit 31 and the second power storage unit 32 is maintained at a standby voltage or less. In addition, the backup control device 10 charges the first power storage unit 31 and the second power storage unit 32 in such a manner that the charging voltage becomes a target voltage greater than the standby voltage according to the start switch of the vehicle being turned on. When the start switch of the vehicle is turned on, if no failure occurs, the charging voltage of the first power storage unit 31 and the second power storage unit 32 is maintained at the target voltage. When the start switch of the vehicle is turned off from the on state, the backup control device 10 discharges the first power storage unit 31 and the second power storage unit 32 until the charging voltage of the first power storage unit 31 and the second power storage unit 32 becomes the standby voltage or less.

[0049] The first charge and discharge unit 52 functions in a manner of supplying a charging current to the first power storage unit 31 based on the power supplied from the first power supply unit 20, and functions in a manner of outputting the power based on the first power storage unit 31 to the load 41. The first charge and discharge unit 52 operates based on the control of the first control unit 51 described later. The first charge and discharge unit 52 is arranged between the conductive line 56 and the conductive line 57. The conductive line 57 is a conductive line between the first charge and discharge unit 52 and the load 41. The first charge and discharge unit 52 has, for example, a voltage conversion circuit such as a DCDC converter. The voltage conversion circuit performs a charging operation and a discharging operation on the first power storage unit 31. As a charging operation, the voltage conversion circuit performs a voltage conversion operation of stepping up or down the voltage applied to the conductive line 56 and applying it to the conductive line 55. As a discharging operation, the voltage conversion circuit performs a voltage conversion operation of stepping up or down the voltage applied to the conductive line 55 and applying it to the conductive line 57.

[0050] The second charge and discharge unit 62 functions in a manner of supplying a charging current to the second power storage unit 32 based on the power supplied from the first power supply unit 20, and functions in a manner of outputting the power based on the second power storage unit 32 to the load 42. The second charge and discharge unit 62 operates based on the control of the second control unit 61 described later. The second charge and discharge unit 62 is arranged between the conductive line 66 and the conductive line 67. The conductive line 67 is a conductive line between the second charge and discharge unit 62 and the load 42. The second charge and discharge unit 62 has, for example, a voltage conversion circuit such as a DCDC converter. The voltage conversion circuit performs a charging operation and a discharging operation on the second power storage unit 32. As a charging operation, the voltage conversion circuit performs a voltage conversion operation of stepping up or down the voltage applied to the conductive line 66 and applying it to the conductive line 65. As a discharging operation, the voltage conversion circuit performs a voltage conversion operation of stepping up or down the voltage applied to the conductive line 65 and applying it to the conductive line 67.

[0051] The first control unit 51 controls the action of supplying electric power from the first power storage unit 31 to the load 41. The first control unit 51 is an information processing device having information processing functions, calculation functions, control functions, and the like. The first control unit 51 is, for example, mainly composed of a microcomputer, and has a calculation device such as a CPU (Central Processing Unit), a memory such as a ROM (Read Only Memory) or a RAM (Random Access Memory), an A / D converter, and the like. The first control unit 51 has a function of controlling the first charging and discharging unit 52. The first control unit 51 sends charging current information that can determine the value of the charging current detected by the first current detection unit 54 to the electronic control unit 12. The charging current information may be the value of the charging current detected by the first current detection unit 54 itself, or may be a value after the value of the charging current is corrected.

[0052] The second control unit 61 controls the action of supplying power from the second power storage unit 32 to the load 42. The second control unit 61 is an information processing device having information processing functions, calculation functions, control functions, and the like. The second control unit 61 is, for example, mainly composed of a microcomputer, and has a calculation device such as a CPU (Central Processing Unit), a memory such as a ROM (Read Only Memory) or a RAM (Random Access Memory), an A / D converter, and the like. The second control unit 61 has a function of controlling the second charge and discharge unit 62. The second control unit 61 sends charging current information that can determine the value of the charging current detected by the second current detection unit 64 to the electronic control unit 12. The charging current information may be the value of the charging current detected by the second current detection unit 64 itself, or may be a value after the value of the charging current is corrected.

[0053] The first voltage detection unit 53 is configured as a voltage detection circuit, for example. The first voltage detection unit 53 detects the voltage of the conductive line 56. The conductive line 56 is electrically connected to the power line 80 and is set to the same potential as the power line 80. Therefore, the first voltage detection unit 53 can detect the voltage of the power line 80.

[0054] The second voltage detection unit 63 is configured as a voltage detection circuit, for example. The second voltage detection unit 63 detects the voltage of the conductive line 66. The conductive line 66 is electrically connected to the power line 80 and is set to the same potential as the power line 80. Therefore, the second voltage detection unit 63 can detect the voltage of the power line 80.

[0055] The first current detection unit 54 is configured as a current detection circuit, for example. The first current detection unit 54 detects the value of the current flowing through the conductive path 56. The first current detection unit 54 detects the value of the charging current supplied to the first charging and discharging unit 52. The current value detected by the first current detection unit 54 is a value (specifically, an analog voltage value) that can identify the current value of the conductive path 56.

[0056] The second current detection unit 64 is configured as a current detection circuit, for example. The second current detection unit 64 detects the value of the current flowing through the conductive path 66. The second current detection unit 64 detects the value of the charging current supplied to the second charging and discharging unit 62. The current value detected by the second current detection unit 64 is a value (specifically, an analog voltage value) that can identify the current value of the conductive path 66.

[0057] [Control of backup control device]

[0058] Figure 2 The control shown is an example of the backup control performed by the backup control device 10 (specifically, the adjustment unit 11). The backup control device 10 starts when a predetermined start condition is satisfied. Figure 2 Backup control of . Start Figure 2 The backup control condition of the vehicle may be, for example, the start switch of the vehicle equipped with the vehicle power supply system 100 is switched from the off state to the on state, or other conditions. For example, when the start switch of the vehicle is switched from the off state to the on state, a start signal indicating that the start switch is switched to the on state is input to the electronic control device 12. When the electronic control device 12 receives the start signal, the backup control device 10 starts Figure 2 The backup control enables the first control unit 51 and the second control unit 61 to perform the control shown below.

[0059] Adjustment section 11 starts Figure 2 In the case of backup control, the second power supply unit 30 (the first power storage unit 31 and the second power storage unit 32) is placed in a standby state (step S11). The adjustment unit 11 charges the first power storage unit 31 and the second power storage unit 32 so that the charging voltage becomes a target voltage greater than the standby voltage. The adjustment unit 11 maintains the charging voltage of the first power storage unit 31 and the second power storage unit 32 at the target voltage.

[0060] Figure 3The control shown is an example of a specific process of step S11. The adjustment unit 11 starts charging the second power supply unit 30 (the first power storage unit 31 and the second power storage unit 32) (step S21). The adjustment unit 11 controls the first charging and discharging unit 52 and the second charging and discharging unit 62. The first charging and discharging unit 52 supplies a charging current to the first power storage unit 31 based on the power supplied from the first power supply unit 20. The second charging and discharging unit 62 supplies a charging current to the second power storage unit 32 based on the power supplied from the first power supply unit 20.

[0061] Then, the adjustment unit 11 adjusts the charging operation of the first charging and discharging unit 52 and the second charging and discharging unit 62 (step S22). Figure 4 As shown in the solid line graph, the adjustment unit 11 controls the first charging and discharging unit 52 corresponding to a part of the storage units (the first storage unit 31) to supply charging current to a part of the storage units (the first storage unit 31) among the plurality of storage units (the first storage unit 31, the second storage unit 32) in the first state during the first period T1. In the description of the first embodiment, a part of the storage units is set to the first storage unit 31, and the other storage units are set to the second storage units 32. The first period T1 starts, for example, from the moment (t0) when the starting switch of the vehicle changes from the off state to the on state. The first state refers to a state in which the charging current is supplied by an arbitrary control method. Specifically, the first state is Figure 4 The current value shown is a constant current charging state of I1. In addition, the first state may be a charging current whose current value changes with the passage of time, for example.

[0062] In the first period T1, the charging current is supplied to the first power storage unit 31 in the first state, and when the charging voltage of the first power storage unit 31 reaches the threshold voltage (for example, Figure 4 In the case of the voltage V12 shown in FIG. 1 , the voltage V12 is shifted to the second period T2. The second period T2 is Figure 4 The adjustment unit 11 controls the first charging and discharging unit 52 corresponding to the first power storage unit 31 so that the first power storage unit 31 is charged at a constant voltage at a voltage value V12 in a second period T2 after the first period T1.

[0063] like Figure 4As shown in the dashed line graph, the adjustment unit 11 controls the second charge and discharge unit 62 corresponding to the second storage unit 32 in a manner such that the other storage unit (the second storage unit 32) among the plurality of storage units (the first storage unit 31, the second storage unit 32) becomes a second state in which the charging current is suppressed compared to the first state during the first period T1. The second state is a state in which charging is stopped. In addition, the second state may also be a state of constant current charging with a current value smaller than the current value I1. In this way, during the first period T1, by suppressing the charging current to the second storage unit 32, the load generated during charging in the vehicle-mounted power supply system 100 can be reduced.

[0064] The adjustment unit 11 controls the second charge and discharge unit 62 corresponding to the second power storage unit 32 so that the charging current is supplied in the third state in which the charging current is increased compared to the second state during the second period T2. Specifically, the third state is Figure 4 The current value I2 in the third state is shown as a constant current charging state. For example, the current value I2 in the third state may be the same as the current value I1.

[0065] The adjustment unit 11 may also control the charging operation of the plurality of charging and discharging units (the first charging and discharging unit 52 and the second charging and discharging unit 62) so that the total value of the charging current to the plurality of storage units (the first storage unit 31 and the second storage unit 32) is within the allowable range. Specifically, the electronic control unit 12 controls the first control unit 51 and the second control unit 61 based on the charging current information provided from the first control unit 51 and the second control unit 61 so that the total value of the charging current to the first storage unit 31 and the second storage unit 32 is within the allowable range. The allowable range is a range of current values ​​that is preset, for example, a range that is greater than 0 and is less than the maximum allowable current value in the vehicle-mounted power supply system 100. The upper limit value (allowable threshold) of the allowable range is, for example, a value smaller than the maximum current value that can flow through a fuse provided in the power line 80 or the like. The allowable threshold is a fixed value and may also be changeable.

[0066] Next, in step S23, when the backup control device 10 determines that the charging of the second power supply unit 30 (the first power storage unit 31 and the second power storage unit 32) is completed, the backup control device 10 ends the charging process. Figure 3 The backup control device 10 determines that charging is completed when the output voltage of the first power storage unit 31 reaches the target voltage and the output voltage of the second power storage unit 32 reaches the target voltage.

[0067] After the charging of the second power supply unit 30 is completed, the adjustment unit 11 Figure 2In step S12, it is determined whether the power supply from the first power supply unit 20 (main power supply) to the loads 41 and 42 is in a failed state. The case where the power supply from the first power supply unit 20 becomes a failed state is, for example, the case where the voltage of the power line 80 that supplies power from the first power supply unit 20 becomes less than the threshold voltage. The threshold voltage is, for example, a value that is significantly smaller than the output voltage applied to the power line 80 by the first power supply unit 20 in normal conditions, and is a fixed value greater than 0. However, the threshold voltage may also be changeable. For example, the first control unit 51 determines whether the voltage of the conductive line 56 is less than the threshold value (whether it is in a predetermined falling state) based on the voltage detected by the first voltage detection unit 53. In an abnormal state where the power line 80 is grounded, disconnected, etc. and the power supply from the first power supply unit 20 to the conductive line 56 is interrupted, the voltage of the conductive line 56 becomes about 0V. In addition, the second control unit 61 may also determine whether the voltage of the conductive line 66 is less than the threshold value (whether it is in a predetermined falling state) based on the voltage detected by the second voltage detection unit 63.

[0068] In step S12, if the adjustment unit 11 determines that the power supply from the first power supply unit 20 to the loads 41 and 42 is in a failed state, the control goes to "Yes" and the process of step S13 is performed. On the other hand, in step S12, if the adjustment unit 11 determines that the power supply from the first power supply unit 20 to the loads 41 and 42 is not in a failed state, the control goes to "No" and the process of step S11 is performed again.

[0069] In step S13, the adjustment unit 11 starts the backup operation. The adjustment unit 11 supplies power from the second power supply unit 30 to the loads 41 and 42. The first control unit 51 operates in a manner that a voltage (a voltage of magnitude V1) based on the output voltage of the first storage unit 31 is applied to the conductive line 57 when the power based on the first storage unit 31 is supplied to the load 41. The voltage V1 is a voltage obtained by stepping up or down the output voltage from the first storage unit 31 by the voltage conversion circuit of the first charge and discharge unit 52. Similarly, the second control unit 61 operates in a manner that a voltage (a voltage of magnitude V2) based on the output voltage of the second storage unit 32 is applied to the conductive line 67 when the power based on the second storage unit 32 is supplied to the load 42. The voltage V2 is a voltage obtained by stepping up or down the output voltage from the second storage unit 32 by the voltage conversion circuit of the second charge and discharge unit 62.

[0070] If the adjustment unit 11 determines in the next step S14 that the vehicle equipped with the vehicle power supply system 100 is in a stopped state, the adjustment unit 11 ends the operation. Figure 2Specifically, the electronic control unit 12 determines whether the start switch of the vehicle equipped with the vehicle power supply system 100 is switched from the on state to the off state. For example, when the start switch of the vehicle is switched from the on state to the off state, a signal indicating that the start switch is switched to the off state is provided to the electronic control unit 12.

[0071] The following description relates to an example of the effect of this configuration.

[0072] The backup control device 10 of the first embodiment is set to supply charging current to a part of the plurality of storage units (the first storage unit 31) in the first state during the first period T1, and to suppress the charging current to the other storage units (the second storage unit 32) different from the part of the storage units (the first storage unit 31) compared with the first state. Therefore, in the first period T1, by suppressing the charging current to the other storage units (the second storage unit 32), the load generated in the vehicle-mounted power supply system 100 can be reduced. On the other hand, in the second period T2, the charging current is supplied to the other storage units (the second storage unit 32) in the third state in which the charging current is increased compared with the second state, thereby making it easy to ensure the supply amount of the charging current to the other storage units (the second storage unit 32). Therefore, it is possible to ensure the supply amount of the charging current to the plurality of storage units (the first storage unit 31 and the second storage unit 32), and reduce the load of the vehicle-mounted power supply system 100 during the charging operation.

[0073] In the backup control device 10 of the first embodiment, the adjustment unit 11 controls the charging operation of the plurality of charging units (the first power storage unit 31 and the second power storage unit 32) so that the total value of the charging current to the plurality of power storage units (the first power storage unit 31 and the second power storage unit 32) is within the allowable range. Therefore, the first power supply unit 20 can supply electric power so that the charging current is within the allowable range. Thus, by appropriately setting the allowable range of the charging current, the load generated in the vehicle-mounted power supply system 100 during charging can be reduced.

[0074] The backup control device 10 of the first embodiment can reliably suppress the charging current to the other power storage unit (the second power storage unit 32) during the first period T1 by stopping the charging of the other power storage unit (the second power storage unit 32) during the first period T1, and can reduce the load generated during charging in the vehicle-mounted power supply system 100.

[0075] In the backup control device 10 of the first embodiment, the first load 41 is set as a load with a higher priority than the second load 42. Therefore, based on the preset priority of the loads, the first load 41 with a higher priority can be charged first.

[0076] In the backup control device 10 of the first embodiment, the adjustment unit 11 shifts to the second period T2 when the charging voltage of the first power storage unit 31 reaches the threshold voltage during the first period T1. Therefore, the shift to the second period T2 can be triggered by the charging voltage of the first power storage unit 31 reaching the threshold voltage during the first period T1 while ensuring a sufficient charging voltage for the first power storage unit 31. In addition, the second power storage unit 32 can be fully charged during the second period T2.

[0077] <Second Embodiment>

[0078] The second embodiment is different from the first embodiment in the control method of the backup control device 10 of the vehicle-mounted power supply system 100, but is the same in other aspects. The same reference numerals are given to the same components as those of the first embodiment, and detailed description thereof will be omitted.

[0079] [Backup control device operation]

[0080] The backup control device 10 of the second embodiment performs the backup control in the same manner as the first embodiment. Figure 2 , Figure 3 The backup control performed by the backup control device 10 (specifically, the adjustment unit 11) of the second embodiment is mainly Figure 3 The charging control (step S22) shown in FIG. 1 is different from that in the first embodiment. Figure 3 The process of the charging control (step S22) shown in FIG. 2 will be described.

[0081] In step S22, the adjustment unit 11 adjusts the charging operation of the first charging and discharging unit 52 and the second charging and discharging unit 62. Figure 5 As shown in the solid line timing diagram, the adjustment unit 11 controls the first charge and discharge unit 52 corresponding to a part of the storage units (the first storage unit 31) in a manner that the charging current is supplied to a part of the storage units (the first storage unit 31) among the plurality of storage units (the first storage unit 31, the second storage unit 32) in the first state during the first period T1. In the description of the second embodiment, a part of the storage units is set to the first storage unit 31, and the other storage units are set to the second storage unit 32. The first period T1 starts, for example, from the moment (t0) when the start switch of the vehicle changes from the off state to the on state. The first period T1 is equivalent to an example of the "prescribed constant current period" of the present disclosure. The first state is a constant current charging state.

[0082] Specifically, the adjustment unit 11 performs the first constant current charging on the first power storage unit 31 during the first constant current period T11 in the first period T1. The first constant current charging is Figure 5The adjustment unit 11 performs a second constant current charge on the first power storage unit 31 in a second constant current period T12 after the first constant current period T11 in the first period T1, in which the current is suppressed compared to the first constant current charge. The second constant current charge is based on the Figure 5 The current value I11 shown is a state where constant current charging is performed at a smaller current value I12.

[0083] In the first period T1, the charging current is supplied to the first power storage unit 31 in the first state. When the charging voltage of the first power storage unit 31 reaches the threshold voltage, the process shifts to the second period T2. Figure 5 The adjustment unit 11 controls the first charge and discharge unit 52 corresponding to the first power storage unit 31 so that the first power storage unit 31 is charged at a constant voltage at a voltage value V13 in a second period T2 after the first period T1.

[0084] like Figure 5 As shown in the dotted line timing chart, the adjustment unit 11 controls the second charge and discharge unit 62 corresponding to the second power storage unit 32 in a manner such that the other power storage unit (the second power storage unit 32) different from the part of the power storage units (the first power storage unit 31) in the plurality of power storage units (the first power storage unit 31, the second power storage unit 32) becomes the second state in which the charging current is suppressed compared with the first state in the first period T1. The second state is a state in which constant current charging is performed in which the charging current is suppressed compared with the first state. In this way, in the first period T1, by suppressing the charging current to the second power storage unit 32, the load generated in the vehicle-mounted power supply system 100 during charging can be reduced.

[0085] Specifically, the adjustment unit 11 stops charging the second power storage unit 32 during the first constant current period T11. The first constant current period T11 is an example of "a portion of a predetermined constant current period" in the present disclosure. Next, the adjustment unit 11 performs a third constant current charge on the second power storage unit 32 during the second constant current period T12, in which the current is suppressed compared to the second constant current charge. The third constant current charge is based on the Figure 5 The current value I12 shown is smaller than the current value I21 in the state of constant current charging.

[0086] The adjustment unit 11 controls the second charge and discharge unit 62 corresponding to the second power storage unit 32 to supply the charging current in the third state in which the charging current is increased compared to the second state during the second period T2. The third state is a state in which the fourth constant current charging is performed in which the current is increased compared to the third constant current charging. The fourth constant current charging is Figure 5 The third constant current charging current value I21 is larger than the constant current charging current value I22. For example, the fourth constant current charging current value I22 may be the same as the current value I11.

[0087] The adjustment unit 11 makes the charging current supplied to the second power storage unit 32 in the fourth constant current charging greater than the charging current supplied to the first power storage unit 31 in the second constant current charging. Figure 5 As shown, the adjustment unit 11 makes the current value I22 of the fourth constant current charging greater than the current value I12 of the second constant current charging.

[0088] The adjustment unit 11 controls the charging operation of the plurality of charging and discharging units (the first charging and discharging unit 52 and the second charging and discharging unit 62) so that the total value of the charging current to the plurality of storage units (the first storage unit 31 and the second storage unit 32) is within the allowable range. Specifically, the electronic control unit 12 controls the first control unit 51 and the second control unit 61 based on the charging current information provided from the first control unit 51 and the second control unit 61 so that the total value of the charging current to the first storage unit 31 and the second storage unit 32 is within the allowable range. The allowable range is a range of current values ​​that is preset, for example, a range that is greater than 0 and is less than the maximum allowable current value in the vehicle-mounted power supply system 100. The upper limit value (allowable threshold value) of the allowable range is, for example, a value smaller than the maximum current value that can flow through a fuse provided in the power line 80 or the like. The allowable threshold value is a fixed value and may also be changeable.

[0089] For example, the adjustment unit 11 controls the first power storage unit 31 and the second power storage unit 32 so that Figure 5 The total of the current value I12 of the second constant current charging to the first power storage unit 31 and the current value I21 of the third constant current charging to the second power storage unit 32 in the second constant current period T12 shown is equal to or less than the allowable current value It.

[0090] The following description relates to an example of the effect of this configuration.

[0091] The backup control device 10 of the second embodiment performs constant current charging of the second power storage unit 32 in a state suppressed compared to the first state (the state of the charging current to the first power storage unit 31) during the second constant current period T12 in the first period T1. Therefore, during the second constant current period T12, the charging current to the second power storage unit 32 can be suppressed to reduce the load generated in the vehicle-mounted power supply system 100, and a constant supply amount of the charging current to the second power storage unit 32 can be ensured.

[0092] In the backup control device 10 of the second embodiment, the adjustment unit 11 performs the first constant current charging on a part of the power storage unit (the first power storage unit 31) during the first constant current period T11 in the first period T1, performs the second constant current charging on a part of the power storage unit (the first power storage unit 31) in the second constant current period T12 after the first constant current period T11 in the first period T1, stops charging the other power storage unit (the second power storage unit 32) during the first constant current period T11, performs the third constant current charging on the other power storage unit (the second power storage unit 32) in the second constant current period T12 in which the current is suppressed compared with the second constant current charging, and performs the fourth constant current charging in which the current is increased compared with the third constant current charging during the second period T2. Therefore, charging the other power storage unit (the second power storage unit 32) is stopped during the first constant current period T11, thereby reducing the load generated in the vehicle-mounted power supply system 100. During the second constant current period T12, the third constant current charging in which the current is suppressed compared with the second constant current charging is also performed on the other power storage unit (the second power storage unit 32), thereby reducing the load generated in the vehicle-mounted power supply system 100. During the second period T2, by performing the fourth constant current charging in which the current is increased compared with the third constant current charging, it is easy to ensure the supply amount of the charging current to the other power storage unit (the second power storage unit 32).

[0093] In the backup control device 10 of the second embodiment, the adjustment unit 11 makes the charging current supplied to the other storage unit (the second storage unit 32) in the fourth constant current charging greater than the charging current supplied to the part of the storage unit (the first storage unit 31) in the second constant current charging. Therefore, in the fourth constant current charging, the charging voltage of the other storage unit (the second storage unit 32) can be brought closer to the target charging voltage more quickly.

[0094] <Third Embodiment>

[0095] The vehicle-mounted power supply system 200 of the third embodiment is different from the first and second embodiments in that the electronic control device 12 is not provided and the first control unit 51 and the second control unit 61 can communicate, but is the same in other aspects. In addition, the same symbols are marked for the same structures as the first and second embodiments, and detailed descriptions are omitted.

[0096] like Figure 6 As shown, the vehicle-mounted power supply system 200 of the third embodiment includes a first power supply unit 20, a second power supply unit 30, loads 41, 42, and a backup control device 210. The backup control device 210 includes an adjustment unit 211, a first charging and discharging unit 52, a first voltage detection unit 53, a second charging and discharging unit 62, and a second voltage detection unit 63. The adjustment unit 211 includes a first control unit 51, a first current detection unit 54, a second control unit 61, and a second current detection unit 64.

[0097] The first control unit 51 and the second control unit 61 can communicate with each other. The first control unit 51 can send charging current information that can identify the value of the charging current detected by the first current detection unit 54 to the second control unit 61. The second control unit 61 can send charging current information that can identify the value of the charging current detected by the second current detection unit 64 to the first control unit 51.

[0098] [Backup control device operation]

[0099] The backup control device 210 (specifically, the adjustment unit 211 ) of the third embodiment performs the backup control in the same manner as the first and second embodiments. Figure 2 , Figure 3 In the first and second embodiments, the first control unit 51 and the second control unit 61 perform control based on the instruction of the electronic control device 12, but in the third embodiment, the first control unit 51 and the second control unit 61 perform control. Figure 2 , Figure 3 Specifically, in step S22, the first control unit 51 and the second control unit 61 adjust the charging operation of the first charging and discharging unit 52 and the second charging and discharging unit 62 (the charging control of the first embodiment described above (see Figure 4 ) or the charging control of the second embodiment (refer to Figure 5 )). For example, the second control unit 61 controls the charging operation of the second charge-discharge unit 62, and controls the charging operation of the first charge-discharge unit 52 via the first control unit 51. In addition, the first control unit 51 may control the charging operation of the first charge-discharge unit 52, and control the charging operation of the second charge-discharge unit 62 via the second control unit 61.

[0100] The backup control device 210 of the third embodiment is configured such that the first control unit 51 and the second control unit 61 communicate with each other and control the first charging and discharging unit 52 and the second charging and discharging unit 62, so there is no need to separately provide a control device for uniformly controlling the first control unit 51 and the second control unit 61. Therefore, the charging control can be completed by the first control unit 51 and the second control unit 61.

[0101] <Other Implementation Methods>

[0102] The present disclosure is not limited to the embodiments described above and illustrated in the drawings. For example, the features of the embodiments described above or later can be combined in all ways within the scope of non-contradiction. In addition, any feature of the embodiments described above or later can be omitted if it is not explicitly stated as a necessary feature. In addition, the embodiments described above can also be changed as follows.

[0103] In the first to third embodiments, the vehicle-mounted power supply system includes two power storage units (the first power storage unit 101 and the second power storage unit 102), but may also include three or more power storage units of the same structure. That is, the second power supply unit 30 may also include three or more power storage units. Three or more control units control the corresponding charging and discharging units, and each charging and discharging unit supplies charging current to each power storage unit. In such a structure, for example, in the adjustment of the charging action ( Figure 3 In step S22), the same control as that performed in the first period T1 and the second period T2 may be sequentially performed on the three or more power storage units.

[0104] In addition, when three or more power storage units are provided, two or more power storage units may be selected as "part of the power storage units" of the present disclosure to perform the same charging control (charging control of first power storage unit 31). Similarly, when three or more power storage units are provided, two or more power storage units may be selected as "other power storage units" of the present disclosure to perform the same charging control (charging control of second power storage unit 32).

[0105] In the above-described first embodiment, the adjustment unit 11 stops charging the second power storage unit 32 during the first period T1 , but the charging may be stopped during a part of the first period T1 .

[0106] In the first embodiment, the adjustment unit 11 increases the charging current in the third state of the second period T2 compared to the second state (current value of the third constant current charge), but the charging current may be increased during a part of the second period T2.

[0107] In the first to third embodiments described above, in the backup control of the backup control device, in step S12, the state in which the voltage of the conductive line 56 is less than the threshold value is exemplified as the prescribed state, but other states may be used. For example, the prescribed state may be a state in which a backup action is requested from the load (specifically, a state in which at least one of the first control unit 51 and the second control unit 61 receives a signal requesting a backup action from the load).

[0108] In the first to third embodiments described above, the start switch of the vehicle has been described, but the start switch may be an ignition switch or, in an electric vehicle or the like, may be a power switch for operating an EV system.

[0109] In the first to third embodiments, the first power supply unit 20 is a lead battery, but is not limited to a lead battery. The first power supply unit 20 may be other types of batteries such as a lithium ion battery, or may be a power source such as an AC generator or a converter.

[0110] In the first to third embodiments, first power storage unit 31 and second power storage unit 32 are electric double layer capacitors, but the power storage units are not limited to electric double layer capacitors and may be other types of power storage units such as lithium ion capacitors and lithium ion batteries.

[0111] In the first to third embodiments, the backup control device performs the backup operation when the power supply from the power supply unit is interrupted. However, the backup control device may perform the backup operation by supplying power from the power storage unit in a predetermined state where the power supply is not completely interrupted.

[0112] The embodiments disclosed herein are to be considered in all respects as illustrative and non-restrictive. The scope of the present invention is not limited to the embodiments disclosed herein, but is intended to include all modifications within the scope of the claims or within the scope equivalent to the claims.

[0113] Description of Reference Numerals

[0114] 10…Backup control device

[0115] 11…Adjustment Department

[0116] 12…Electronic control unit

[0117] 20…First power supply unit

[0118] 30…Second power supply unit

[0119] 31 ... first power storage unit (power storage unit, part of power storage unit)

[0120] 32…Second power storage unit (power storage unit, other power storage unit)

[0121] 41…Load (first load)

[0122] 42…Load (second load)

[0123] 51…First control unit (control unit)

[0124] 52 ... first charge and discharge unit (charging unit, first discharge unit)

[0125] 53 ... first voltage detection unit

[0126] 54 ... first current detection unit

[0127] 55, 56, 57…conductive circuit

[0128] 61…Second control unit (control unit)

[0129] 62 ... second charge and discharge unit (charge unit, second discharge unit)

[0130] 63 ... second voltage detection unit

[0131] 64 ... second current detection unit

[0132] 65, 66, 67…conductive circuit

[0133] 80…Power lines

[0134] 81A, 81B, 81C…power lines

[0135] 100…In-vehicle power supply system

[0136] 101 ...first power storage unit

[0137] 102 ... second power storage unit

[0138] 200…In-vehicle power supply system

[0139] 210…Backup control device

[0140] 211…Adjustment Department

Claims

1. A vehicle-mounted backup control device, used in a vehicle-mounted power supply system having a first power supply unit and a second power supply unit, and performing a backup operation at least when the power supply from the first power supply unit to a load fails, the second power supply unit having a plurality of power storage units, the backup operation being an operation of supplying power to the load based on the power from the second power supply unit, wherein: The vehicle-mounted backup control device comprises: a plurality of charging units configured to supply charging current based on the electric power supplied from the first power supply unit; and an adjustment unit, controlling the plurality of charging units, Each of the charging units performs an operation of supplying a charging current to each of the power storage units, The adjustment unit controls the charging unit corresponding to a part of the plurality of storage units so that a charging current is supplied to the part of the storage units in a first state during a first period and constant voltage charging is performed on the part of the storage units during a second period after the first period. The adjustment unit controls the charging unit corresponding to the other storage unit among the plurality of storage units, which is different from the one part of the storage units, in such a manner that the other storage unit becomes in a second state in which the charging current is suppressed compared with the first state during the first period, and supplies the charging current in a third state in which the charging current is increased compared with the second state during the second period.

2. The vehicle-mounted backup control device according to claim 1, wherein: The adjustment unit controls the charging operation of the plurality of charging units so that a total value of charging currents to the plurality of power storage units is limited to within an allowable range.

3. The vehicle-mounted backup control device according to claim 1 or 2, wherein: The adjustment unit controls the charging unit corresponding to the part of the power storage unit so that the part of the power storage unit is charged with a constant current during the first period and the part of the power storage unit is charged with a constant voltage during the second period. The adjustment unit controls the charging unit corresponding to the other power storage unit so as to stop charging the other power storage unit during at least a part of the first period and to charge the other power storage unit during the second period.

4. The vehicle-mounted backup control device according to claim 1 or 2, wherein: The adjustment unit controls the charging unit corresponding to the part of the power storage unit so that the part of the power storage unit is charged with a constant current during a predetermined constant current period in the first period and the part of the power storage unit is charged with a constant voltage during the second period. The adjustment unit performs constant current charging of the other power storage unit in a state suppressed compared to the first state during at least a portion of the predetermined constant current period, and performs constant current charging with a charging current increased compared to the second state during at least a portion of the second period.

5. The vehicle-mounted backup control device according to claim 1 or 2, wherein: The adjustment unit performs a first constant current charge on the part of the power storage unit during a first constant current period in the first period, and performs a second constant current charge on the part of the power storage unit in a second constant current period after the first constant current period in the first period, wherein the current is suppressed compared to the first constant current charge. The adjustment unit stops charging the other power storage units during the first constant current period, performs third constant current charging on the other power storage units during the second constant current period in which the current is suppressed compared to the second constant current charging, and performs fourth constant current charging on the other power storage units in which the current is increased compared to the third constant current charging during at least a portion of the second period.

6. The vehicle-mounted backup control device according to claim 5, wherein: The adjustment unit makes the charging current supplied to the other power storage units in the fourth constant current charging larger than the charging current supplied to the part of the power storage units in the second constant current charging.

7. The vehicle-mounted backup control device according to claim 1 or 2, wherein: The load includes a first load and a second load different from the first load, Some of the plurality of charging units supply charging current to the some of the power storage units. Another charging unit among the plurality of charging units, which is different from the one part of the charging units, supplies a charging current to the other power storage unit. The vehicle-mounted backup control device comprises: a first discharge unit configured to supply electric power to the first load based on the electric power supplied from the part of the electric storage unit; and The second discharge unit supplies electric power to the second load based on the electric power supplied from the other electric storage unit. The first load is set as the load having a higher priority than the second load.

8. The vehicle-mounted backup control device according to claim 7, wherein: The adjustment unit supplies a charging current to the part of the power storage units in the first state during the first period, and shifts to the second period when a charging voltage of the part of the power storage units reaches a threshold voltage. The adjustment unit supplies a charging current whose current is suppressed compared with the first state to the part of the power storage units in the second period, and increases a charging current to the other power storage units compared with the charging current supplied in the first period.

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