In-vehicle backup control device

Abstract

During the backup operation, the operation of supplying power from the first power storage unit to the common load and the operation of supplying power from the second power storage unit to the common load can be used in combination. The in-vehicle backup control device (1) performs a backup operation for supplying power to the loads (91-95) on the basis of power from the first power storage unit (71) and the second power storage unit (72), at least in a predetermined state in which power supply from the power supply unit (90) to the loads (91-95) is cut off or reduced. A backup control device (1) is provided with: a supply circuit (30) that supplies power from a first power storage unit (71) and a second power storage unit (72) to a load (93); and a first control unit (41) and a second control unit (42) that control the operation of the supply circuit (30) that supplies power from the first power storage unit (71) to the load (93) and the operation of the supply circuit (30) that supplies power from the second power storage unit (72) to the load (93).

Description

Technical Field

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

[0002] Patent document 1 discloses a power storage device that supplies power from a power storage unit to a load when the voltage of a main power source decreases. The control circuit of the power storage device controls a charging circuit to charge the power storage unit when the main power source is normal. Furthermore, when the voltage of the main power source decreases (for example, when the engine is started after an idling stop), the control circuit turns on a switch disposed between the power storage unit and the load to supply power to the load. In addition, Patent document 1 states that the power storage device can also be applied to a power backup system when the main power source is abnormal.

[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] The power storage device of Patent Document 1 is configured to supply power from one power storage unit to a load to be backed up. However, in such a configuration, there is only one power source for the load during backing up, and the method of supplying power is limited.

[0008] An object of the present disclosure is to enable, during a backup operation, both an operation of supplying electric power from a first power storage unit to a common load and an operation of supplying electric power from a second power storage unit to the common load.

[0009] Technical solutions to solve problems

[0010] The vehicle-mounted backup control device as one of the present disclosures is used for a vehicle-mounted power supply system having a power supply unit and a power storage unit, and performs a backup operation of supplying power to the load based on the power from the power storage unit when the power supply from the power supply unit to the load is cut off or reduced in a specified state, wherein:

[0011] The power storage unit includes a first power storage unit and a second power storage unit,

[0012] The loads include specified common loads,

[0013] The vehicle-mounted backup control device has:

[0014] a supply circuit that supplies electric power from the first power storage unit and the second power storage unit to the common load; and

[0015] The control unit controls an operation of supplying electric power from the first power storage unit to the common load and an operation of supplying electric power from the second power storage unit to the common load in the supply circuit.

[0016] Effects of the Invention

[0017] The technology according to the present disclosure can use both an operation of supplying electric power from the first power storage unit to the common load and an operation of supplying electric power from the second power storage unit to the common load during the standby operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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.

[0019] Figure 2 This is a flowchart illustrating the flow of control performed by the vehicle-mounted backup control device according to the first embodiment.

[0020] Figure 3 1 is a block diagram schematically illustrating an in-vehicle power supply system including an in-vehicle backup control device according to a second embodiment.

[0021] Figure 4 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

[0022] The following are examples of the embodiments of the present disclosure. In addition, the features [1] to [5] described below can be combined arbitrarily within the scope of non-contradiction.

[0023] [1] A vehicle-mounted backup control device for a vehicle-mounted power supply system including a power supply unit and a power storage unit, which performs a backup operation of supplying power to the load based on power from the power storage unit when the power supply to the load is cut off or reduced in a predetermined state, wherein:

[0024] The power storage unit includes a first power storage unit and a second power storage unit,

[0025] The loads include specified common loads,

[0026] The vehicle-mounted backup control device has:

[0027] a supply circuit that supplies electric power from the first power storage unit and the second power storage unit to the common load; and

[0028] The control unit controls an operation of supplying electric power from the first power storage unit to the common load and an operation of supplying electric power from the second power storage unit to the common load in the supply circuit.

[0029] The vehicle-mounted backup control device of [1] can perform a backup operation using the power storage unit in a predetermined state where the power supply from the power supply unit is cut off or reduced. In the backup control device, power can be supplied from the first power storage unit and the second power storage unit to a predetermined common load. Therefore, during the backup operation, the backup control device can use both the operation of supplying power from the first power storage unit to the common load and the operation of supplying power from the second power storage unit to the common load.

[0030] [2] The vehicle-mounted backup control device described in [1] has the following features: The vehicle-mounted backup control device further includes the first power storage unit and the second power storage unit.

[0031] The vehicle-mounted backup control device of the above-mentioned [2] includes the first power storage unit and the second power storage unit, and can thus perform a backup operation within the device.

[0032] [3] The vehicle-mounted backup control device described in [1] or [2] has the following features. The supply circuit includes a first supply circuit and a second supply circuit. The first supply circuit outputs the electric power based on the first power storage unit to the second supply circuit. The second supply circuit switches between a state in which the electric power input from the first supply circuit is supplied to the common load and a state in which the electric power based on the second power storage unit is supplied to the common load.

[0033] In the vehicle-mounted backup control device of the above-mentioned [3], it is possible to switch between a state in which power is supplied from the first power storage unit and a state in which power is supplied from the second power storage unit, thereby being able to select a power supply source from the first power storage unit and the second power storage unit. On this basis, the second supply circuit has a function of supplying power from the second power storage unit to the common load, and a function of switching between a state in which power is supplied from the first power storage unit and a state in which power is supplied from the second power storage unit. Therefore, compared with the case in which a structure having a function of switching between a state in which power is supplied from the first power storage unit and a state in which power is supplied from the second power storage unit is separately provided, the structure of the vehicle-mounted backup control device can be simplified.

[0034] [4] The vehicle-mounted backup control device described in [3] has the following features. The supply circuit includes a first supply circuit and a second supply circuit. The second supply circuit outputs the electric power based on the second power storage unit to the first supply circuit. The first supply circuit switches between a state in which the electric power based on the input from the second supply circuit is supplied to the common load and a state in which the electric power based on the first power storage unit is supplied to the common load.

[0035] In the vehicle-mounted backup control device of the above-mentioned [4], the first supply circuit can also have a function of switching between a state in which electric power is supplied from the first power storage unit and a state in which electric power is supplied from the second power storage unit.

[0036] [5] The vehicle-mounted backup control device described in [1] or [2] has the following features. The supply circuit includes a first supply circuit, a second supply circuit, and a switching unit. The first supply circuit outputs power based on the first power storage unit. The second supply circuit outputs power based on the second power storage unit. The switching unit switches between a state in which power based on the output from the first supply circuit is supplied to the common load and a state in which power based on the output from the second supply circuit is supplied to the common load.

[0037] In the vehicle-mounted backup control device of the above-mentioned [5], it is possible to switch between a state in which power is supplied from the first power storage unit and a state in which power is supplied from the second power storage unit, thereby enabling selection of a power supply source from the first power storage unit and the second power storage unit. On this basis, the switching unit is provided separately from the first supply circuit and the second supply circuit, thereby enabling simplification of the structure of the first supply circuit and the second supply circuit.

[0038] <First Embodiment>

[0039] [Structure of the vehicle power supply system]

[0040] Figure 1 The vehicle-mounted power supply system 100 shown includes a power supply unit 90, loads 91, 92, 93, 94, 95, and a vehicle-mounted backup control device 1. The vehicle-mounted backup control device 1 is also referred to as a backup control device 1.

[0041] The power supply unit 90 functions as a main power supply that continuously supplies power when the vehicle equipped with the vehicle power supply system 100 is started. The power supply unit 90 is a DC power supply that generates a DC voltage. The power supply unit 90 is composed of a storage battery such as a lead acid battery, for example. The terminal on the high potential side of the power supply unit 90 is electrically connected to one end of the power path 80, and the terminal on the low potential side of the power supply unit 90 is electrically connected to the ground line. The power supply unit 90 applies a predetermined voltage to the power path 80. In addition, in this specification, the so-called voltage, unless otherwise specified, is a voltage based on the ground line.

[0042] The power supply unit 90 is electrically connected to the loads 91, 92, 93, 94, and 95 via the power path 80. The power from the power supply unit 90 is supplied to the loads 91, 92, 93, 94, and 95 via the power path 80. Figure 1In the example of FIG. 1 , the power path 80 includes: a power path 81A, which is a conductive path directly connected to the power supply unit 90; a power path 81B, which is connected to the load 91; a power path 81C, which is a conductive path connected to the load 92; a power path 81D, which is a conductive path connected to the load 93; a power path 81E, which is a conductive path connected to the load 94; and a power path 81F, which is a conductive path connected to the load 95. The power paths 81A, 81B, 81C, 81D, 81E, and 81F are electrically connected to each other. When power is supplied from the power supply unit 90 to the loads 91, 92, 93, 94, and 95, the power paths 81A, 81B, 81C, 81D, 81E, and 81F are at the same potential. A relay or a fuse, etc., not shown in the figure, is provided in the power path 80, and these elements have the function of cutting off the conduction of the power path 80.

[0043] Loads 91, 92, 93, 94, 95 are vehicle-mounted electrical devices. Loads 91, 92, 93, 94, 95 are loads to which power is expected to be supplied when the power supply from the power supply unit 90 is in an abnormal state (failure state) in which the power supply is stopped. Loads 91, 92, 93, 94, 95 may be actuators such as electric motors, for example. 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.

[0044] Load 93 corresponds to an example of the “predetermined common load” of the present disclosure. Load 93 can be supplied with power from first power storage unit 71 via first supply circuit 31 described later, and can be supplied with power from second power storage unit 72 via second supply circuit 32 described later.

[0045] The backup control device 1 includes a supply circuit 30, a first control unit 41, a second control unit 42, a first detection unit 51, a second detection unit 52, a first power storage unit 71, and a second power storage unit 72. The supply circuit 30 includes a first supply circuit 31 and a second supply circuit 32. The first control unit 41 and the second control unit 42 are equivalent to an example of a “control unit” of the present disclosure. The first power storage unit 71 and the second power storage unit 72 are equivalent to an example of a “power storage unit” of the present disclosure. The backup control device 1 is a device that can perform a backup operation of supplying power to the loads 91, 92, 93, 94, 95 based on the power of the first power storage unit 71 and the second power storage unit 72 when the power supply from the power supply unit 90 to the loads 91, 92, 93, 94, 95 is cut off or reduced in a predetermined state (abnormal state).

[0046] The backup control device 1 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 71, a first control unit 41 described later, a first supply circuit 31, and a first detection unit 51. The second power storage unit 102 includes a second power storage unit 72, a second control unit 42 described later, a second supply circuit 32, and a second detection unit 52.

[0047] The first power storage unit 71 and the second power storage unit 72 function as auxiliary power supplies. The first power storage unit 71 and the second power storage unit 72 are DC power supplies that output DC voltages, such as double-layer capacitors. The first power storage unit 71 is electrically connected to the first supply circuit 31 described later via the conductive path 15, and is charged and discharged via the first supply circuit 31. The charging voltage (output voltage) of the first power storage unit 71 is the voltage applied to the conductive path 15. The terminal on the high potential side of the first power storage unit 71 is electrically connected to the conductive path 15 and has the same potential as the conductive path 15. The terminal on the low potential side of the first power storage unit 71 is electrically connected to the ground wire and has the same potential as the ground wire.

[0048] The second power storage unit 72 is electrically connected to the second supply circuit 32 described later via the conductive path 25, and is charged and discharged via the second supply circuit 32. The charging voltage (output voltage) of the second power storage unit 72 is a voltage applied to the conductive path 25. The terminal on the high potential side of the second power storage unit 72 is electrically connected to the conductive path 25 and has the same potential as the conductive path 25. The terminal on the low potential side of the second power storage unit 72 is electrically connected to the ground line and has the same potential as the ground line.

[0049] In the backup control device 1, 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 71 and the second power storage unit 72 is maintained below the standby voltage. In addition, the backup control device 1 charges the first power storage unit 71 and the second power storage unit 72 in a manner that the charging voltage is greater than the target voltage greater than the above-mentioned standby voltage in accordance with the switching of the start switch of the vehicle to the on state. When the start switch of the vehicle is in the on state, in the case where a failure state does not occur, the charging voltage of the first power storage unit 71 and the second power storage unit 72 is maintained at the above-mentioned target voltage. When the start switch of the vehicle is switched from the on state to the off state, the backup control device 1 discharges the first power storage unit 71 and the second power storage unit 72 until the charging voltage of the first power storage unit 71 and the second power storage unit 72 becomes less than the standby voltage.

[0050] The first supply circuit 31 functions to supply electric power from the first power storage unit 71 to the loads 91 and 92 and the second supply circuit 32. The second supply circuit 32 functions to supply electric power to the loads 94 and 95.

[0051] The first supply circuit 31 outputs the power based on the first power storage unit 71 to the second supply circuit 32. The first supply circuit 31 operates based on the control of the first control unit 41 described later. The first supply circuit 31 is arranged between the conductive path 14 and the conductive paths 11, 12, and 13. The first supply circuit 31 has a voltage conversion circuit such as a DCDC converter. The voltage conversion circuit performs a charging operation and a discharging operation for the first power storage unit 71. As a charging operation, the voltage conversion circuit performs a voltage conversion operation of stepping up or down the voltage applied to the conductive path 14 and applying it to the conductive path 15. As a discharging operation, the voltage conversion circuit performs a voltage conversion operation of stepping up or down the voltage applied to the conductive path 15 and applying it to the conductive path 11, etc.

[0052] The second supply circuit 32 switches between a state in which the power input from the first supply circuit 31 is supplied to the load 93 and a state in which the power based on the second power storage unit 72 is supplied to the load 93. The second supply circuit 32 operates based on the control of the second control unit 42 described later. The second supply circuit 32 is configured between the conductive path 24 and the conductive paths 21, 22, and 23. The second supply circuit 32 has, for example, a voltage conversion circuit such as a DCDC converter. The voltage conversion circuit performs a charging operation and a discharging operation for the second power storage unit 72. As a charging operation, the voltage conversion circuit performs a voltage conversion operation of stepping up or down the voltage applied to the conductive path 24 and applying it to the conductive path 25. When the voltage conversion circuit supplies the power based on the second power storage unit 72 to the load 93, as a discharging operation, the voltage conversion circuit performs a voltage conversion operation of stepping up or down the voltage applied to the conductive path 25 and applying it to the conductive path 21, etc.

[0053] The first control unit 41 controls the operation of supplying power from the first power storage unit 71 to the load 91, the load 92, and the second supply circuit 32. The first control unit 41 is an information processing device having information processing functions, calculation functions, control functions, and the like. The first control unit 41 is mainly composed of, for example, 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 41 has a function of controlling the first supply circuit 31.

[0054] The second control unit 42 controls the operation of supplying power from the second power storage unit 72 to the loads 93, 94, and 95. The second control unit 42 is an information processing device having information processing functions, calculation functions, control functions, and the like. The second control unit 42 is mainly composed of, for example, 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 42 has a function of controlling the second supply circuit 32.

[0055] The first detector 51 is configured as a voltage detection circuit, for example. The first detector 51 detects the voltage of the conductive path 14. The conductive path 14 is electrically connected to the power path 80 and is set to the same potential as the power path 80. Therefore, the first detector 51 can detect the voltage of the power path 80.

[0056] The conductive path 11 is a conductive path between the first supply circuit 31 and the load 91. The conductive path 12 is a conductive path between the first supply circuit 31 and the load 92. The conductive path 13 is a conductive path between the first supply circuit 31 and the second supply circuit 32.

[0057] The second detector 52 is configured as a voltage detection circuit, for example. The second detector 52 detects the voltage of the conductive path 24. The conductive path 24 is electrically connected to the power path 80 and is set to the same potential as the power path 80. Therefore, the second detector 52 can detect the voltage of the power path 80.

[0058] The conductive path 21 is a conductive path between the second supply circuit 32 and the load 93. The conductive path 22 is a conductive path between the second supply circuit 32 and the load 94. The conductive path 23 is a conductive path between the second supply circuit 32 and the load 95.

[0059] [Operation of the backup control device]

[0060] exist Figure 2 An example of backup control performed by the backup control device 1 (specifically, the first control unit 41 and the second control unit 42) is shown in FIG. The first control unit 41 and the second control unit 42 start when a predetermined start condition is satisfied. Figure 2 Backup control of . Start Figure 2The condition of the backup control may be, for example, that 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. In the representative example described below, 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 provided from an external device (for example, an external ECU (Electronic Control Unit)) to the first control unit 41 and the second control unit 42. When the first control unit 41 and the second control unit 42 receive such a start signal, they start Figure 2 Backup control.

[0061] The first control unit 41 and the second control unit 42 start Figure 2 In the case of standby control, the first power storage unit 71 and the second power storage unit 72 are charged in step S11 so that the charging voltage is equal to or higher than the target voltage greater than the standby voltage. The first control unit 41 and the second control unit 42 maintain the charging voltage of the first power storage unit 71 and the second power storage unit 72 at the target voltage.

[0062] The first control unit 41 and the second control unit 42 determine in step S12 whether the output voltage of the power supply unit 90 (main power supply) is reduced (whether it is in a prescribed reduced state). The first control unit 41 determines whether the voltage of the conductive path 14 is less than a threshold value (whether it is in a prescribed reduced state) based on the voltage detected by the first detection unit 51, for example. The threshold value is a value that is significantly smaller than the output voltage applied to the power path 80 by the power supply unit 90 in normal conditions, and is a value greater than 0. It should be noted that the second control unit 42 may also determine whether the voltage of the conductive path 24 is less than a threshold value (whether it is in a prescribed reduced state) based on the voltage detected by the second detection unit 52. When the first control unit 41 determines in step S12 that the voltage of the conductive path 14 is less than the threshold value (in the case of yes in step S12), the process proceeds to step S13. In this representative example, the case where the voltage of the conductive path 14 is less than the threshold value, that is, the case where the voltage of the power path 80 is less than the threshold value corresponds to an example of the "prescribed state" of the present disclosure. When the first control unit 41 determines in step S12 that the voltage of the conductive path 14 is equal to or higher than the threshold value (NO in step S12 ), the first control unit 41 performs the process of step S11 again.

[0063] For example, in an abnormal state where the power supply from the power supply unit 90 to the conductive paths 14 and 24 and the power supply to the power paths 81B, 81C, 81D, 81E, and 81F are interrupted due to a ground short circuit or a disconnection of the power path 80, the voltage of the conductive paths 14 and 24 becomes approximately 0 V. In such a case, in the backup control device 1, the first control unit 41 and the second control unit 42 perform a backup operation of supplying power to the plurality of loads 91, 92, 93, 94, and 95 based on the power from the first power storage unit 71 and the second power storage unit 72. The second control unit 42 performs the processing after step S13 on the loads 93, 94, and 95. It should be noted that, hereinafter, the description of the backup operation of the first control unit 41 on the loads 91 and 92 is omitted, and an example of supplying power to the loads 93, 94, and 95 by the second control unit 42 is described.

[0064] When the second control unit 42 determines in step S12 that the voltage of the conductive path 14 is lower than the threshold value (if YES in step S12), in step S13, the second control unit 42 starts supplying power to the loads 93, 94, 95. The second control unit 42 causes the second supply circuit 32 to supply power to the conductive paths 21, 22, 23.

[0065] In the next step S14, the second control unit 42 controls the supply of power to the load 93. The second control unit 42 switches the second supply circuit 32 between a state in which the power input from the first supply circuit 31 is supplied to the load 93 and a state in which the power from the second power storage unit 72 is supplied to the load 93. When the second control unit 42 supplies the power input from the first supply circuit 31 to the load 93, the second supply circuit 32 operates so that the voltage (voltage of magnitude V1) applied to the conductive path 13 is applied to the conductive path 21. The voltage V1 is a voltage obtained by stepping up or down the output voltage from the first power storage unit 71 by the voltage conversion circuit of the first supply circuit 31. When the second control unit 42 supplies the power from the second power storage unit 72 to the load 93, the second control unit 42 operates so that the voltage (voltage of magnitude V2) based on the output voltage of the second power storage unit 72 is applied to the conductive path 21. The voltage V2 is a voltage obtained by stepping up or down the output voltage from the second power storage unit 72 by the voltage conversion circuit of the second supply circuit 32. The voltage V1 and the voltage V2 may be of the same magnitude (slightly different values).

[0066] In the next step S15, the first control unit 41 and the second control unit 42 determine whether the vehicle equipped with the vehicle power supply system 100 is in a stopped state. The first control unit 41 and the second control unit 42 determine 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 changed from the on state to the off state, a start signal indicating that the start switch is switched to the off state is provided to the first control unit 41 and the second control unit 42 from an external device (for example, an external ECU (Electronic Control Unit)). When receiving such a start signal, the first control unit 41 and the second control unit 42 determine that the vehicle is in a stopped state. When the first control unit 41 and the second control unit 42 determine in step S15 that the vehicle is not in a stopped state (in a started state) (if it is no in step S15), the processing of step S14 is performed again. When the first control unit 41 and the second control unit 42 determine in step S15 that the vehicle is in a stopped state (if it is yes in step S15), the process ends. Figure 2 Backup control.

[0067] The following description relates to an example of the effect of this structure.

[0068] The backup control device 1 can perform a backup operation using the first power storage unit 71 and the second power storage unit 72 in a predetermined state where the supply of power from the power supply unit 90 is cut off or reduced. In the backup control device 1, power can be supplied from the first power storage unit 71 and the second power storage unit 72 to the load 93. Therefore, the backup control device 1 can use both the operation of supplying power from the first power storage unit 71 to the load 93 and the operation of supplying power from the second power storage unit 72 to the load 93 during the backup operation.

[0069] Furthermore, the backup control device 1 further includes the first power storage unit 71 and the second power storage unit 72. Therefore, the backup control device 1 includes the first power storage unit 71 and the second power storage unit 72, and can perform a backup operation in the device.

[0070] Furthermore, in the backup control device 1, it is possible to switch between the state of supplying power from the first power storage unit 71 and the state of supplying power from the second power storage unit 72, thereby being possible to select the power supply source from the first power storage unit 71 and the second power storage unit 72. On this basis, the second supply circuit 32 has a function of supplying power from the second power storage unit 72 to the load 93, and a function of switching between the state of supplying power from the first power storage unit 71 and the state of supplying power from the second power storage unit 72. Therefore, compared with the case where a structure having a function of switching between the state of supplying power from the first power storage unit 71 and the state of supplying power from the second power storage unit 72 is separately provided, the structure of the backup control device 1 can be simplified.

[0071] <Second Embodiment>

[0072] The vehicle-mounted power supply system 200 of the second embodiment has a switch unit 33, which is different from the first embodiment in that the power supplied to the load 93 is switched by the switch unit 33, but is the same in other respects. It should be noted that the same reference numerals are used for the same structures as the first embodiment, and detailed descriptions are omitted.

[0073] like Figure 3 As shown, the vehicle-mounted power supply system 200 includes a vehicle-mounted backup control device 1 (also referred to as the backup control device 1). The supply circuit 230 of the backup control device 1 includes a first supply circuit 31, a second supply circuit 32, and a switching unit 233. The first supply circuit 31 functions to supply power to the switching unit 233. The first supply circuit 31 outputs the power based on the first power storage unit 71 to the switching unit 233 via the conductive path 213. The conductive path 213 is a conductive path between the first supply circuit 31 and the switching unit 233.

[0074] The second supply circuit 32 functions to supply power to the switch unit 233. The second supply circuit 32 outputs the power based on the second power storage unit 72 to the switch unit 233 via the conductive path 221. The conductive path 221 is a conductive path between the second supply circuit 32 and the switch unit 233. The conductive path 234 is a conductive path between the switch unit 233 and the load 93.

[0075] The switching unit 233 switches between a state in which the power based on the output from the first supply circuit 31 is supplied to the load 93 and a state in which the power based on the output from the second supply circuit 32 is supplied to the load 93. The switching unit 233 includes, for example, a switch. The switching unit 233 operates under the control of, for example, the first control unit 41 and the second control unit 42.

[0076] [Operation of the backup control device]

[0077] The backup control performed by the backup control device 1 (specifically, the first control unit 41 and the second control unit 42 ) of the second embodiment is different from that of the first embodiment only in step S14 .

[0078] The first control unit 41 and the second control unit 42 control the power supply to the load 93 in step S14. The first control unit 41 and the second control unit 42 switch the switch unit 233 between a state in which the power based on the input from the first supply circuit 31 is supplied to the load 93 and a state in which the power based on the second power storage unit 72 is supplied to the load 93. When the power based on the input from the first supply circuit 31 is supplied to the load 93, the switch unit 233 operates so that the voltage (voltage of magnitude V21) applied to the conductive path 213 is applied to the conductive path 234. The voltage V21 is a voltage obtained by stepping up or down the output voltage from the first power storage unit 71 by the voltage conversion circuit of the first supply circuit 31. When the power based on the second power storage unit 72 is supplied to the load 93, the first control unit 41 and the second control unit 42 operate so that the voltage (voltage of magnitude V22) based on the output voltage of the second power storage unit 72 is applied to the conductive path 234. The voltage V22 is a voltage obtained by stepping up or down the output voltage from the second power storage unit 72 by the voltage conversion circuit of the second supply circuit 32. The voltage V21 and the voltage V22 may be of the same magnitude (slightly different values).

[0079] The following description relates to an example of the effect of this structure.

[0080] In the backup control device 1, the supply circuit 230 includes the first supply circuit 31, the second supply circuit 32, and the switching unit 233. The switching unit 233 switches between a state in which the power based on the output from the first supply circuit 31 is supplied to the load 93 and a state in which the power based on the output from the second supply circuit 32 is supplied to the load 93. Therefore, in the backup control device 1, it is possible to switch between a state in which the power is supplied from the first power storage unit 71 and a state in which the power is supplied from the second power storage unit 72, thereby enabling the power supply source to be selected from the first power storage unit 71 and the second power storage unit 72. On this basis, the switching unit 233 is provided separately from the first supply circuit 31 and the second supply circuit 32, thereby enabling the configuration of the first supply circuit 31 and the second supply circuit 32 to be simplified.

[0081] <Third Embodiment>

[0082] The vehicle power supply system 300 of the third embodiment is different from the first embodiment in that the first power storage unit 101 has a function of switching the power source for the load 93, but is the same in other respects. The same reference numerals are used for the same configurations as those of the first embodiment, and detailed descriptions thereof are omitted.

[0083] like Figure 4As shown, the vehicle-mounted power supply system 300 has a conductive path 16. The conductive path 16 is a conductive path between the first supply circuit 31 and the load 93. The first supply circuit 31 switches between a state in which the power input from the second supply circuit 32 is supplied to the load 93 and a state in which the power based on the first power storage unit 71 is supplied to the load 93.

[0084] The backup control of the backup control device 1 of the third embodiment is mainly similar to that of the first embodiment (see Figure 2 ) are the same, but the control described below is different. In the backup control device 1 of the third embodiment, the first supply circuit 31 has a function of switching the power source (the first power storage unit 71 and the second power storage unit 72).

[0085] In step S14 of the standby control (refer to Figure 2 ), the first supply circuit 31 performs switching control of the power source. The second control unit 42 switches the second supply circuit 32 between a state in which the power based on the input from the second supply circuit 32 is supplied to the load 93 and a state in which the power based on the first power storage unit 71 is supplied to the load 93. When the first control unit 41 supplies the power based on the input from the second supply circuit 32 to the load 93, the first supply circuit 31 operates in such a manner that the voltage (voltage of magnitude V2) applied to the conductive path 13 is applied to the conductive path 16. The voltage V2 is a voltage obtained by stepping up or down the output voltage from the second power storage unit 72 by the voltage conversion circuit of the second supply circuit 32. When the first control unit 41 supplies the power based on the first power storage unit 71 to the load 93, the voltage V1 is a voltage obtained by stepping up or down the output voltage from the first power storage unit 71 by the voltage conversion circuit of the first supply circuit 31. The voltage V1 and the voltage V2 may be of the same magnitude (slightly different values).

[0086] In the backup control device 1 of the third embodiment, the first supply circuit 31 can be provided with a function of switching between a state in which electric power is supplied from the first power storage unit 71 and a state in which electric power is supplied from the second power storage unit 72 .

[0087] <Other Implementation Methods>

[0088] The present disclosure is not limited to the embodiments described above and illustrated in the accompanying drawings. For example, the features of the embodiments described above or below can be combined in any way within the scope of non-contradiction. In addition, any feature of the embodiments described above or below can be omitted as long as it is not explicitly stated as a necessary feature. Moreover, the embodiments described above can also be changed in the following manner.

[0089] In the above embodiment, in the backup control of the backup control device 1, in step S12, the state where the voltage of the conductive path 14 is less than the threshold value is exemplified as the predetermined state, but other states may be used. For example, the predetermined state may be a state where a backup action is requested from the load (specifically, a state where at least one of the first control unit 41 and the second control unit 42 receives a signal requesting a backup action from the load).

[0090] In the first to third embodiments, the loads 91, 92, 93, 94, 95 are configured to be supplied with power from the power supply unit 90 via the power paths 81B, 81C, 81D, 81E, 81F, respectively. However, a configuration may be adopted in which the power paths 81B, 81C, 81D, 81E, 81F are not provided. In this case, the power in normal times (when the power supply unit 90 is normal) is directly supplied to the loads 91, 92, 93, 94, 95 via the backup power source (the first power storage unit 71 and the second power storage unit 72).

[0091] In the second embodiment described above, the first power storage unit 101 and the second power storage unit can supply power to the common load (load 93) based on the backup operation regardless of the presence or absence of the power supply path to the common load (load 93). Similarly, in the third embodiment described above, the first power storage unit 101 and the second power storage unit can independently supply power to the common load (load 93) based on the backup operation even if there is no input from the other unit.

[0092] In the third embodiment, a conductive path is provided to connect the second supply circuit 32 to the load 93, and the second supply circuit 32 has a function of switching power sources (the first power storage unit 71 and the second power storage unit 72) in addition to the first supply circuit 31.

[0093] In the first embodiment, the start switch of the vehicle is described, but the start switch may be an ignition switch or a power switch for operating an EV system in an electric vehicle or the like.

[0094] In the first embodiment, the power source is a lead acid battery, but the present invention is not limited to the lead acid battery. The power source may be other types of batteries such as lithium ion batteries, or may be a power source such as an AC generator or a converter.

[0095] In the first embodiment, the power storage unit is an electric double layer capacitor, but the power storage unit is not limited to the electric double layer capacitor and may be another type of power storage unit such as a lithium ion capacitor or a lithium ion battery.

[0096] In the first embodiment, 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 to supply power from the power storage unit in a predetermined state where the power supply is not completely interrupted.

[0097] The embodiments disclosed herein are illustrative in all aspects and should not be construed as 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 indicated by the claims or within the scope equivalent to the claims.

[0098] Description of symbols

[0099] 1: Backup control device;

[0100] 11, 12, 13, 14, 15: conductive paths;

[0101] 21, 22, 23, 24, 25: conductive paths;

[0102] 30: supply circuit;

[0103] 31: first supply circuit;

[0104] 32: second supply circuit;

[0105] 33: Switching unit;

[0106] 41: first control unit (control unit);

[0107] 42: second control unit (control unit);

[0108] 51: first detection unit;

[0109] 52: second detection unit;

[0110] 71: a first power storage unit (power storage unit);

[0111] 72: second power storage unit (power storage unit);

[0112] 80: Power path;

[0113] 81A, 81B, 81C, 81D, 81E, 81F: power path;

[0114] 90: Power supply unit;

[0115] 91, 92, 94, 95: load;

[0116] 93: load (shared load);

[0117] 100, 200, 300: vehicle-mounted power supply system;

[0118] 101: a first power storage unit;

[0119] 102: a second power storage unit;

[0120] 213, 221, 234: conductive paths;

[0121] 230: supply circuit;

[0122] 233: Switching unit.

Claims

1. A vehicle-mounted backup control device, for use in a vehicle-mounted power supply system having a power supply unit and a power storage unit, which performs a backup operation of supplying power to the load based on power from the power storage unit when the power supply from the power supply unit to the load is cut off or reduced in a predetermined state, wherein: The power storage unit includes a first power storage unit and a second power storage unit, The loads include specified common loads, The vehicle-mounted backup control device has: a supply circuit that supplies electric power from the first power storage unit and the second power storage unit to the common load; and The control unit controls an operation of supplying electric power from the first power storage unit to the common load and an operation of supplying electric power from the second power storage unit to the common load in the supply circuit.

2. The vehicle-mounted backup control device according to claim 1, wherein: The vehicle-mounted backup control device further includes the first power storage unit and the second power storage unit.

3. The vehicle-mounted backup control device according to claim 1 or 2, wherein: The supply circuit includes a first supply circuit and a second supply circuit. The first supply circuit outputs the electric power based on the first power storage unit to the second supply circuit, The second supply circuit switches between a state in which electric power based on input from the first supply circuit is supplied to the common load and a state in which electric power based on the second power storage unit is supplied to the common load.

4. The vehicle-mounted backup control device according to claim 3, wherein: The supply circuit includes a first supply circuit and a second supply circuit. The second supply circuit outputs the electric power based on the second power storage unit to the first supply circuit. The first supply circuit switches between a state in which electric power based on input from the second supply circuit is supplied to the common load and a state in which electric power based on the first power storage unit is supplied to the common load.

5. The vehicle-mounted backup control device according to claim 1 or 2, wherein: The supply circuit includes a first supply circuit, a second supply circuit, and a switching unit. The first supply circuit outputs electric power based on the first power storage unit, The second supply circuit outputs electric power based on the second power storage unit, The switching unit switches between a state in which electric power based on the output from the first supply circuit is supplied to the common load and a state in which electric power based on the output from the second supply circuit is supplied to the common load.

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