In-vehicle control device

Abstract

A vehicle-mounted control device (10) is provided with a control unit (16), a voltage conversion unit (30), a first element unit (21), a second element unit (22), and a third element unit (23). The first element unit (21) can allow current to flow from the voltage conversion unit (30) side to the second power path (82) side, and can block current from flowing from the second power path (82) side to the voltage conversion unit (30) side. The second element unit (22) is capable of allowing a current to flow from the first power path (82) side to the voltage conversion unit (30) side, and is capable of blocking a current flowing from the voltage conversion unit (30) side to the first power path (81) side. The third element unit (23) can allow a current to flow from the electricity storage unit (92) side to the second power path (82) side, and can block a current flowing from the second power path (82) side to the electricity storage unit (92) side.

Description

Technical Field

[0001] The present disclosure relates to a vehicle-mounted control device. Background Art

[0002] Patent document 1 discloses a power supply system. The power supply system of Patent document 1 includes a main battery and a sub-battery, and operates in a manner that switches the power supply source to the load from the main battery side to the sub-battery side when the power supply from the main battery side is interrupted. The power supply system of Patent document 1 is provided with a body diode in the switch between the sub-battery and the load, and when the power from the main battery is interrupted, even if the above switch is in the off state, power is supplied to the load via the body diode, so that the power supply is not interrupted. Prior art literature Patent Literature

[0003] Patent document 1: Japanese Patent Application Publication No. 2020-182318. Summary of the invention Problems to be solved by the invention

[0004] The power supply system of Patent Document 1 may not be able to supply an appropriate voltage to the load when the output voltage of the sub-battery decreases. In order to eliminate this concern, it is preferable to introduce a discharge circuit that can supply an appropriate voltage to the load based on the power from the sub-battery, but if it is simply introduced, the device structure will be complicated. On the other hand, in a system that can supply power from the sub-battery to the load, when the sub-battery is discharged for some reason, it is necessary to recharge the sub-battery in advance in case of failure. Therefore, it is preferable to introduce a charging circuit that can supply an appropriate voltage to the sub-battery, but simply introducing it will lead to further complexity.

[0005] The present disclosure relates to a vehicle-mounted control device capable of performing a backup operation of supplying electric power based on a storage unit, and one of its purposes is to provide a technology that can adjust the charging voltage when charging the storage unit and the discharging voltage when discharging the storage unit with a simpler structure, and can discharge the storage unit via a path different from the path for adjusting the voltage. Means for solving problems

[0006] As one of the present disclosures, a vehicle-mounted control device is used in a vehicle-mounted system to control power supply from a power storage unit, the vehicle-mounted system comprising: a power supply unit that supplies power; the power storage unit that is different from the power supply unit; a first power path to which a voltage based on the power supply unit is applied; a second power path that is a path for supplying power supplied from the first power path to a load; a third power path that is different from the first power path and the second power path; and a fourth power path to which a voltage based on the power storage unit is applied, the vehicle-mounted control device comprising: a voltage conversion unit that performs a first conversion action and a second conversion action, the first conversion action being to convert a voltage applied to the third power path and apply an output voltage to the fourth power path the action of applying a voltage to the fourth power path; the second conversion action is an action of converting the voltage applied to the fourth power path and applying an output voltage to the third power path; a control unit, controlling the voltage conversion unit; a first element unit, capable of allowing current to flow from the voltage conversion unit side to the second power path side, and capable of cutting off current from the second power path side to the voltage conversion unit side; a second element unit, capable of allowing current to flow from the first power path side to the voltage conversion unit side, and capable of cutting off current from the voltage conversion unit side to the first power path side; and a third element unit, capable of allowing current to flow from the power storage unit side to the second power path side, and capable of cutting off current from the second power path side to the power storage unit side. Effects of the Invention

[0007] The technology according to the present disclosure can adjust the charging voltage when charging the power storage unit and the discharging voltage when discharging the power storage unit with a simpler structure, and can discharge the power storage unit through a path different from the path for adjusting the voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a circuit diagram schematically showing an example of an in-vehicle system including the in-vehicle control device according to the first embodiment. Figure 2 This is a flowchart illustrating the flow of backup control performed in the vehicle-mounted control device according to the first embodiment. Figure 3 It is an explanatory diagram for explaining an example of the power supply operation performed by the vehicle-mounted control device according to the first embodiment when the first power path is in the normal state. Figure 4 It is an explanatory diagram for explaining an example of changes in the voltage (power supply voltage) of the first power path, changes in the operation of the voltage conversion unit, and changes in the voltage (storage unit voltage) of the fourth power path over time when the first power path is in a normal state. Figure 5This is an explanatory diagram for explaining an example of the power supply operation performed by the vehicle-mounted control device of the first embodiment when the first power path is equal to or smaller than the first threshold value and the failure determination condition is not satisfied. Figure 6 This is an illustrative diagram that illustrates an example of changes in the voltage of the first power path and the voltage of the second power path (load voltage) over time, changes in the current of the third element unit and the fourth element unit, changes in the operation of the voltage conversion unit, and changes in the voltage of the fourth power path when the first power path is below a first threshold value and a failure judgment condition is not satisfied. Figure 7 This is an explanatory diagram for explaining an example of the power supply operation performed by the vehicle-mounted control device of the first embodiment when the first power path is equal to or smaller than the first threshold and the failure determination condition is satisfied. Figure 8 This is an explanatory diagram for explaining an example of the power supply operation performed by the vehicle-mounted control device of the first embodiment after a certain amount of time has passed since the failure determination condition is satisfied. Fig. 9 This is an explanatory diagram that illustrates an example of changes in voltage of the first power path and the second power path, changes in current of the first element unit and the third element unit, and changes in the operation of the voltage conversion unit over time when the first power path is below the first threshold and a failure determination condition is met. Fig.10 This is an explanatory diagram for explaining an example of the power supply operation performed by the vehicle-mounted control device of the first embodiment when an abnormality occurs in the fourth element unit while the first power path is in a normal state. Fig.11 It is an explanatory diagram for explaining changes in voltage of the first power path and changes in current of the first element portion and the fourth element portion with the passage of time when an abnormality occurs in the fourth element portion while the first power path is in a normal state. Fig.12 This is an explanatory diagram for explaining an example of the power supply operation performed by the vehicle-mounted control device of the first embodiment when the voltage in the first power path is equal to or higher than the overvoltage threshold. Fig.13 This is an explanatory diagram that illustrates an example of voltage changes in the first power path over time, current changes in the third element unit and the fourth element unit, changes in the operation of the voltage conversion unit, and voltage changes in the fourth power path when the first power path is above an overvoltage threshold. Fig.14 This is a circuit diagram schematically showing an example of an in-vehicle system including the in-vehicle control device according to the second embodiment. Fig.15It is an explanatory diagram for explaining an example of the power supply operation performed by the vehicle-mounted control device according to the second embodiment when the first power path is in the normal state. Fig.16 This is an explanatory diagram for explaining an example of the power supply operation performed by the vehicle-mounted control device of the second embodiment when the second power path is equal to or smaller than the first threshold value and the failure determination condition is not satisfied. Fig.17 This is an explanatory diagram for explaining an example of the power supply operation performed by the vehicle-mounted control device of the second embodiment when the first power path becomes equal to or less than the first threshold and the failure determination condition is satisfied. Fig.18 This is an explanatory diagram for explaining an example of the power supply operation performed by the vehicle-mounted control device of the second embodiment after a certain amount of time has passed since the failure determination condition is satisfied. Fig.19 It is an explanatory diagram for explaining an example of the power supply operation performed by the vehicle-mounted control device according to the second embodiment when the voltage in the first power path is equal to or higher than the overvoltage threshold. Fig. 20 This is a circuit diagram schematically showing an example of an in-vehicle system including the in-vehicle control device according to the third embodiment. Fig.21 It is an explanatory diagram showing a modification example of the element portion. DETAILED DESCRIPTION

[0009] [Description of Embodiments of the Present Disclosure] Embodiments of the present disclosure are listed and illustrated below. In addition, the features [1] to

[13] illustrated below can also be combined arbitrarily in non-contradictory combinations.

[0010] [1] A vehicle-mounted control device for a vehicle-mounted system, for controlling power supply from a power storage unit, the vehicle-mounted system comprising: a power supply unit for supplying power; the power storage unit being different from the power supply unit; a first power path to which a voltage based on the power supply unit is applied; a second power path being a path for supplying power supplied from the first power path to a load; a third power path being different from the first power path and the second power path; and a fourth power path to which a voltage based on the power storage unit is applied, the vehicle-mounted control device comprising: a voltage conversion unit for performing a first conversion operation and a second conversion operation, the first conversion operation being a conversion of a voltage applied to the third power path to the fourth power path the first element unit being capable of allowing current to flow from the voltage conversion unit side to the second power path side, and being capable of cutting off current from the second power path side to the voltage conversion unit side; the second element unit being capable of allowing current to flow from the first power path side to the voltage conversion unit side, and being capable of cutting off current from the voltage conversion unit side to the first power path side; and the third element unit being capable of allowing current to flow from the power storage unit side to the second power path side, and being capable of cutting off current from the second power path side to the power storage unit side.

[0011] The vehicle-mounted control device of the above-mentioned [1] can apply a desired voltage to the fourth power path and charge the power storage unit by causing the voltage conversion unit to perform a first conversion operation in a state where the second element unit allows current to flow from the first power path side to the voltage conversion unit side. On the other hand, by causing the voltage conversion unit to perform a second conversion operation in a state where the first element unit allows current to flow from the voltage conversion unit side to the second power path side, a desired voltage can be applied to the third power path and power can be supplied to the second power path. That is, the vehicle-mounted control device can adjust the charging voltage when charging the power storage unit and the discharging voltage when discharging the power storage unit with a simpler structure, and the second element unit can cut off the current from the voltage conversion unit side to the first power path side according to the situation. In addition, the third element unit is provided to allow current to flow from the power storage unit side to the second power path side, so that the power storage unit can be discharged through a path different from the path where the voltage is adjusted by the voltage conversion unit. In addition, the third element unit can cut off the current from the second power path side to the power storage unit side, so that the current from the second power path side to the power storage unit through the third element unit can be cut off according to the situation.

[0012] [2] The vehicle-mounted control device described in [1] further includes a fourth element unit that allows current to flow from the first power path side to the second power path side and blocks current from flowing from the second power path side to the first power path side.

[0013] In the vehicle-mounted control device of the above-mentioned [2], the fourth element unit can allow current to flow from the first power path side to the second power path side, so that the power from the power supply unit can be directly supplied to the second power path via the fourth element unit. On the other hand, depending on the situation, the fourth element unit can cut off the current from the second power path side to the first power path side.

[0014] [3] In the vehicle-mounted control device described in [2], the fourth element unit is configured to, when it is in the off state, bidirectionally cut off the current flowing between the first power path and the second power path through itself; when it is in the on state, allow the current to flow from the first power path to the second power path through itself, and when the voltage of the first power path exceeds a first threshold value, the control unit sets the fourth element unit to the on state, and when the voltage of the first power path is below the first threshold value, allows the current to flow from the storage unit side to the second power path side in the third element unit, and the control unit sets the fourth element unit to the off state.

[0015] The vehicle-mounted control device of the above-mentioned [3] can directly supply the power from the power supply unit to the second power path with reduced loss by turning on the fourth element unit when the voltage of the first power path exceeds the first threshold value. On the other hand, when the voltage of the first power path is below the first threshold value, the third element unit allows the current to flow from the storage unit side to the second power path side, and the control unit can turn off the fourth element unit, thereby suppressing the influence of the first power path from spreading to the second power path via the fourth element unit, and allowing the discharge current to flow from the storage unit to the second power path via the third element unit.

[0016] [4] In the vehicle-mounted control device described in [2] or [3], there is an abnormality detection unit for detecting an abnormality of the fourth element unit, and the first element unit is configured to bidirectionally cut off the current flowing between the third power path and the second power path through itself when it is in the off state; when it is in the on state, it allows the current to flow from the third power path to the second power path through itself, and when the abnormality detection unit detects an abnormality in the fourth element unit, the current is allowed to flow from the first power path side to the third power path side in the second element unit, and the control unit causes the first element unit to be in the on state.

[0017] The vehicle-mounted control device of the above-mentioned [4] can allow current to flow from the first power path side to the third power path side in the second element part when the abnormality detection unit detects an abnormality in the fourth element part, and the control unit turns the first element part into an on state, so that power can be supplied from the first power path side to the second power path side using the path of the second element part and the first element part. On the other hand, the first element part can also be turned off, in which case, it is possible to prevent current from flowing from the second power path side to the third power path side via the first element part.

[0018] [5] In the vehicle-mounted control device described in any one of [2] to [4], the fourth element unit is configured to bidirectionally cut off the current flowing between the first power path and the second power path through itself when it is in the off state; and to allow the current to flow from the first power path to the second power path through itself when it is in the on state, and when the voltage of the first power path exceeds a first threshold value and is less than a voltage threshold greater than the first threshold value, the control unit sets the fourth element unit to the on state, and when the voltage of the first power path is greater than the voltage threshold, allows the current to flow from the storage unit side to the second power path side in the third element unit, and the control unit sets the fourth element unit to the off state.

[0019] The vehicle-mounted control device of the above-mentioned [5] makes the fourth element unit into a conducting state when the voltage of the first power path is large enough to exceed the first threshold value but not large enough to reach the above-mentioned voltage threshold value, thereby being able to directly supply the power from the power supply unit to the second power path with reduced loss. On the other hand, when the voltage of the first power path excessively rises to a level exceeding the above-mentioned voltage threshold value, the third element unit allows the current to flow from the power storage unit side to the second power path side and makes the fourth element unit into a cut-off state, thereby being able to suppress the influence of the overvoltage of the first power path from spreading to the second power path via the fourth element unit, and making the discharge current flow from the power storage unit to the second power path via the third element unit.

[0020] [6] In the vehicle-mounted control device described in [5], when the voltage of the first power path is greater than the voltage threshold, current is allowed to flow from the storage unit side to the second power path side in the third element unit, and the control unit causes the voltage conversion unit to perform the first conversion action.

[0021] The vehicle-mounted control device described in the above-mentioned [6] can supply power from the power conversion unit to the power storage unit using power from the first power path when the voltage of the first power path excessively rises to a level above the above-mentioned voltage threshold, and the discharge current flows to the second power path via the third element unit.

[0022] [7] In the vehicle-mounted control device described in any one of [1] to [3], the second element unit is configured to, when the second element unit is in the off state, bidirectionally cut off the current flowing between the first power path and the third power path through the second element unit; when the second element unit is in the on state, allow the current to flow from the first power path to the third power path through the second element unit, and the control unit sets the second element unit to the on state on the condition that the voltage of the first power path exceeds a first threshold value and is less than a voltage threshold value greater than the first threshold value. When the voltage of the first power path is greater than the voltage threshold value, the control unit allows the current to flow from the third power path side to the second power path side in the first element unit, and the control unit sets the second element unit to the off state to cause the voltage conversion unit to perform the second conversion operation.

[0023] The vehicle-mounted control device of the above-mentioned [7] can set the second element unit to the on-state and supply power from the first power path side to the voltage conversion unit side under the condition that the voltage of the first power path exceeds the above-mentioned first threshold value and is less than the above-mentioned voltage threshold value. On the other hand, when the voltage of the first power path excessively rises to above the above-mentioned voltage threshold value, the voltage conversion unit can be made to perform the second conversion operation in a state where the second element unit is set to the off-state to cut off the power supply from the first power path side to the third power path side and the power supply from the third power path side to the second power path side via the first element unit is allowed.

[0024] [8] In the vehicle-mounted control device described in any one of [1] to [7], when a specified condition is met when the voltage of the first power path is below a first threshold value, current is allowed to flow from the storage unit side to the second power path side in the third element unit, and the control unit causes the voltage conversion unit to perform the first conversion action.

[0025] The vehicle-mounted control device described in the above-mentioned [8] can, even when the voltage of the first power path drops below the first threshold value, enable the voltage conversion unit to perform the first conversion action and supply power to the storage unit side when the specified conditions are met, and can also supply power to the storage unit side in this way and supply power to the second power path side via the third element unit.

[0026] [9] In the vehicle-mounted control device described in [8], the prescribed condition includes as a condition that a predetermined failure judgment condition does not hold; when the voltage of the first power path is below the first threshold value, the failure judgment condition does not hold as a condition, current is allowed to flow from the first power path side to the voltage conversion unit side in the second element unit, and the control unit causes the voltage conversion unit to perform the first conversion action; when the failure judgment condition holds when the voltage of the first power path is below the first threshold value, current is cut off from the voltage conversion unit side to the first power path side in the second element unit and current is allowed to flow from the third power path side to the second power path side in the first element unit, and the control unit causes the voltage conversion unit to perform the second conversion action.

[0027] The vehicle-mounted control device of the above-mentioned [9] can allow the current to flow to the voltage conversion unit side via the second element unit and make the voltage conversion unit perform the first conversion operation to charge the power storage unit even when the voltage of the first power path drops below the first threshold value, provided that the failure determination condition is not satisfied. On the other hand, the vehicle-mounted control device can cut off the reverse flow to the first power path side and supply the voltage adjusted based on the voltage conversion operation of the voltage conversion unit to the second power path when the failure determination condition is satisfied.

[0028]

[10] In the vehicle-mounted control device described in [9], the third element unit is configured to bidirectionally cut off current flowing between the fourth power path and the second power path through itself when it is in the off state; and to allow current to flow from the fourth power path to the second power path through itself when it is in the on state, and the control unit at least controls the on and off of the third element unit. When the voltage of the first power path is below the first threshold value, when a switch occurs from a state where the failure determination condition is not satisfied to a state where the failure determination condition is satisfied, the control unit maintains the third element unit in the on state before and after the switching, and after the switching, cuts off current flowing from the voltage conversion unit side to the first power path side in the second element unit and allows current flowing from the third power path side to the second power path side in the first element unit, and the control unit causes the voltage conversion unit to perform the second conversion operation. When the voltage conversion unit satisfies the prescribed operation condition after the switching, the control unit switches the third element unit to the off state.

[0029] The vehicle-mounted control device of the above-mentioned 〔10〕 can quickly supply power from the power storage unit to the second power path by turning on the third element unit when the voltage of the first power path changes to a state where the failure determination condition is not satisfied and the state where the failure determination condition is satisfied occurs when the voltage of the first power path is less than the first threshold. After the switching, it is possible to prevent the reverse flow to the first power path side, and supply the power whose voltage is adjusted by the second conversion operation to the second power path via the third power path and the first element unit. In addition, the vehicle-mounted control device can maintain the third element unit in the on state before and after the switching, so that even if the rise of the output of the voltage conversion unit after the switching is delayed, the power supply from the power storage unit to the second power path via the third element unit can be continued. In addition, the vehicle-mounted control device switches the third element unit to the off state when the voltage conversion unit satisfies the prescribed operation condition after the switching, thereby narrowing the discharge path to the path of the first element unit of the first element unit and the third element unit.

[0030]

[11] In the vehicle-mounted control device described in [9] or

[10] , the failure determination condition includes a condition that current flows from the voltage conversion unit side to the first power path side via the second element unit, and when the voltage of the first power path is less than the first threshold value, on the condition that current does not flow from the voltage conversion unit side to the first power path side via the second element unit, the second element unit allows current to flow from the first power path side to the voltage conversion unit side, and the control unit causes the voltage conversion unit to perform the first conversion operation, and the third element unit allows current to flow from the power storage unit side to the second power path side, and when the voltage of the first power path is less than the first threshold value, when current flows from the voltage conversion unit side to the first power path side via the second element unit, the second element unit cuts off current from the voltage conversion unit side to the first power path side, and the first element unit allows current to flow from the third power path side to the second power path side, and the control unit causes the voltage conversion unit to perform the second conversion operation.

[0031] The vehicle-mounted control device of the above-mentioned 〔11〕 can charge the storage unit by causing the voltage conversion unit to perform the first conversion action, based on the fact that the current does not flow to the first power path side via the second element unit, that is, the possibility that the first power path is not grounded is high, when the voltage of the first power path is below the first threshold. Moreover, the vehicle-mounted control device can discharge via the third element unit in parallel with the power supply to the storage unit side based on the above-mentioned first conversion action. On the other hand, when the current flows to the first power path side via the second element unit when the voltage of the first power path is below the first threshold, that is, when the first power path is likely to be grounded, the current flowing to the first power path side is cut off in the second element unit, and the influence of the grounding can be suppressed from spreading to the third power path side. Furthermore, by allowing the current to flow to the second power path side in the first element unit and causing the voltage conversion unit to perform the second conversion action, the influence of the grounding can be suppressed and the power whose voltage is adjusted by the voltage conversion unit can be supplied to the second power path.

[0032]

[12] In the vehicle-mounted control device described in any one of [9] to

[11] , the failure judgment condition includes a condition that the voltage of the first power path becomes below a second threshold value lower than the first threshold value, and on the condition that the voltage of the first power path is below the first threshold value and exceeds the second threshold value, current is allowed to flow from the first power path side to the voltage conversion unit side in the second element unit and the control unit causes the voltage conversion unit to perform the first conversion action, and current is allowed to flow from the storage unit side to the second power path side in the third element unit, and when the voltage of the first power path is below the second threshold value, current is cut off from the voltage conversion unit side to the first power path side in the second element unit, and current is allowed to flow from the third power path side to the second power path side in the first element unit and the control unit causes the voltage conversion unit to perform the second conversion action.

[0033] The vehicle-mounted control device of the above-mentioned 〔12〕 can charge the storage unit by causing the voltage conversion unit to perform the first conversion action when the voltage of the first power path is below the first threshold value, i.e., the voltage of the first power path is not too low, after confirming that the voltage exceeds the second threshold value. Moreover, the vehicle-mounted control device can discharge via the third element unit in parallel with the power supply to the storage unit side based on the above-mentioned first conversion action. On the other hand, when the voltage of the first power path is below the second threshold value, i.e., when the voltage of the first power path is too low, the current flowing to the first power path side can be cut off in the second element unit, so even if a ground fault occurs in the first power path, the influence of the ground fault can be suppressed from spreading to the third power path side. Furthermore, by allowing the current to flow to the second power path side in the first element unit and causing the voltage conversion unit to perform the second conversion action, the influence of the voltage drop of the first power path can be suppressed, and the power whose voltage is adjusted by the voltage conversion unit can be supplied to the second power path.

[0034]

[12] In the vehicle-mounted control device described in any one of [9] to

[12] , the failure judgment condition includes a condition that a prescribed failure signal is provided to the vehicle-mounted control device from an external device different from the vehicle-mounted control device, and on the condition that the voltage of the first power path is less than the first threshold value and the failure signal is not provided from the external device, current is allowed to flow from the first power path side to the voltage conversion unit side in the second element unit and the control unit causes the voltage conversion unit to perform the first conversion action, and current is allowed to flow from the storage unit side to the second power path side in the third element unit; when the voltage of the first power path is less than the first threshold value and the failure signal is provided from the external device, current is cut off from the voltage conversion unit side to the first power path side in the second element unit, current is allowed to flow from the third power path side to the second power path side in the first element unit, and the control unit causes the voltage conversion unit to perform the second conversion action.

[0035] The vehicle-mounted control device of the above-mentioned 〔13〕 can, when the voltage of the first power path is below the first threshold value, cause the voltage conversion unit to perform the first conversion action and charge the storage unit on the basis of confirming that no failure signal is provided from the external device. Moreover, the vehicle-mounted control device can discharge via the third element unit in parallel with the power supply to the storage unit side based on the first conversion action. On the other hand, when the voltage of the first power path is below the first threshold value, when a failure signal is generated, the current flowing to the first power path side can be cut off in the second element unit, and the current flowing to the second power path side can be allowed in the first element unit and the voltage conversion unit can be caused to perform the second conversion action. Therefore, even if a ground fault or the like occurs in the first power path when a failure signal is generated, its influence can be suppressed, and the power whose voltage is adjusted by the voltage conversion unit can be supplied to the second power path.

[0036]

[14] In the vehicle-mounted control device described in any one of [8] to

[13] , during the period in which the third element unit allows current to flow from the storage unit side to the second power path side and causes the voltage conversion unit to perform the first conversion action, the control unit causes the power supplied from the voltage conversion unit to the fourth power path side to be greater than the power supplied to the second power path side via the third element unit.

[0037] The vehicle-mounted control device of the above-mentioned

[14] can make the charging power based on the first conversion operation greater than the discharging power through the third element unit when the first conversion operation and the discharging through the third element unit are performed in parallel. Therefore, when the above-mentioned parallel operation is performed, the charging current to the storage unit can be more reliably ensured and the power can be supplied to the second conductive circuit.

[0038]

[15] In the vehicle-mounted control device described in any one of [1] to

[14] , when the output voltage of the storage unit is below a specified value when the voltage of the first power path exceeds a first threshold value, current is allowed to flow from the first power path side to the voltage conversion unit side in the second element unit, and the control unit causes the voltage conversion unit to perform the first conversion action.

[0039] The vehicle-mounted control device of the above-mentioned

[15] can charge the power storage unit through the first conversion operation when the output voltage of the power storage unit drops below a predetermined value. [Details of Embodiments of the Present Disclosure]

[0040] <First Embodiment> 1. Overview of in-vehicle systems exist Figure 1 An in-vehicle system 2 is shown. Figure 1The vehicle-mounted system 2 mainly includes a vehicle-mounted power supply system 3 and a load 101. The vehicle-mounted power supply system 3 is also referred to as the power supply system 3 in the following description. The vehicle-mounted system 2 is a system that operates the load 101 by supplying power to the load 101 through the power supply system 3. Figure 1 In FIG. 2 , the load 101 is illustrated as an example of a vehicle-mounted load, but other loads may be provided in the vehicle-mounted system 2 .

[0041] The load 101 is an electrical component mounted on the vehicle. The load 101 operates by receiving power supplied via the power path 80. The type of the load 101 is not limited. As the load 101, various known vehicle-mounted components can be used. The load 101 may include a plurality of electrical components or a single electrical component.

[0042] The power supply system 3 is a system that supplies power to the load 101. The power supply system 3 supplies power to the load 101 using the power supply unit 91 or the power storage unit 92 as a power supply source. The power supply system 3 can supply power from the power supply unit 91 to the load 101. For example, when the power supply from the power supply unit 91 is interrupted due to a fault or the like, the power storage unit 92 can be used as a supply source for supplying power to the load 101 when the power supply from the power supply unit 91 to the load 101 is not interrupted, depending on the situation.

[0043] 2. Overview of the power supply system The power supply system 3 includes a power supply unit 91, a power storage unit 92, a vehicle-mounted control device 10, and the like. Figure 1 In the representative example shown, the first power path 81, the second power path 82, the third power path 83, the fourth power path 84, the conductive path 89, etc. constitute a part of the vehicle-mounted control device 10. However, part or all of the first power path 81, the second power path 82, the third power path 83, the fourth power path 84, and the conductive path 89 may not be an element of the vehicle-mounted control device 10.

[0044] The power supply unit 91 is a vehicle-mounted power supply capable of supplying electric power to the load 101. The power supply unit 91 is configured as a known vehicle-mounted power storage unit such as a lead battery, for example. The power supply unit 91 may be configured by a battery other than a lead battery (for example, a lithium ion battery, other batteries, etc.), or may include a power supply unit other than a battery instead of a battery or in addition to a battery. Figure 1 In the example of FIG. 1 , the positive electrode of the power supply unit 91 is electrically connected to the first power path 81 in a structure short-circuited with the first power path 81 as a part of the power path 80. The negative electrode of the power supply unit 91 is electrically connected to the ground in a structure short-circuited with the ground. The power supply unit 91 applies a fixed value of DC voltage to the first power path 81. The voltage applied by the power supply unit 91 to the first power path 81 may also be slightly changed from the above-mentioned fixed value.

[0045] The power storage unit 92 is a power source different from the power supply unit 91. The power storage unit 92 is a power source that serves as a power supply source at least when the power supply from the power supply unit 91 is interrupted. The power storage unit 92 is composed of a well-known power storage unit such as an electric double layer capacitor (EDLC). The power storage unit 92 may be composed of a capacitor other than an electric double layer capacitor, or may include other power storage units (such as batteries) instead of or in addition to the capacitor. Figure 1 In the example of , the positive electrode of the storage unit 92 is electrically connected to the fourth power path 84 in a structure short-circuited with the fourth power path 84. The negative electrode of the storage unit 92 is electrically connected to the ground in a structure short-circuited with the ground. The output voltage of the storage unit 92 (the voltage applied by the storage unit 92 to the fourth power path 84) may be greater than the output voltage of the power supply unit 91 (the voltage applied by the power supply unit 91 to the first power path 81), may be smaller than the output voltage of the power supply unit 91, or may be equal to the output voltage of the power supply unit 91.

[0046] In this specification, unless otherwise specified, voltage refers to a voltage relative to a ground potential (e.g., 0 V), and is a potential difference from the ground potential. For example, the voltage applied to the first power path 81 refers to the potential difference between the potential of the first power path 81 and the ground potential. The voltage applied to the fourth power path 84 refers to the potential difference between the potential of the fourth power path 84 and the ground potential.

[0047] The power path 80 is a path for transmitting the power from the power supply unit 91 and is a path for supplying the power from the power supply unit 91 to the load 101. Figure 1 In the example, the power path 80 includes a first power path 81 to which a voltage based on the power supply unit 91 is applied, and a second power path 82 which is a path for supplying power supplied from the first power path 81 to the load 101 .

[0048] The first power path 81 is a conductive path that constitutes part or all of the power supply path between the power supply unit 91 and the second element unit 22. A voltage that is the same as or substantially the same as the output voltage of the power supply unit 91 is applied to the first power path 81. A portion of one end side of the first power path 81 is electrically connected to the positive electrode of the power supply unit 91 in a structure that is short-circuited with the positive electrode. Figure 1 In the example, a portion of the other end side of the first power path 81 is connected to one end of the second element portion 22 (at Figure 1 In the example, the first power path 81 is electrically connected to the one end of the semiconductor switch (ie, the drain terminal) by a short-circuited structure. In addition, a portion of the first power path 81 is connected to the one end of the fourth element portion 24 (at Figure 1In the example, one end of the semiconductor switch 24A, i.e., the drain terminal, is short-circuited and electrically connected to the one end. A relay or a fuse may also be provided in the first power path 81. The first power path 81 functions in a manner that, for example, the positive electrode of the power supply unit 91, one end of the second element unit 22, and one end of the fourth element unit 24 are set to the same potential or substantially the same potential.

[0049] The second power path 82 is a conductive path that constitutes part or all of the power supply path between the first element unit 21 and the load 101. A part of one end side of the second power path 82 is connected to the other end side of the first element unit 21 (at Figure 1 In the example, the other end of the semiconductor switch 21B, i.e., the drain terminal, is electrically connected. Furthermore, a portion of the second power path 82 is connected to the other end of the fourth element portion 24 (at Figure 1 In the example, one end of the semiconductor switch 24B, namely the drain terminal, is short-circuited to be electrically connected to the other end of the third element portion 23 (at Figure 1 In the example, one end of the semiconductor switch 23B, i.e., the drain terminal, is short-circuited. Figure 1 In the example, a portion of the other end side of the second power path 82 is electrically connected to the load 101 in a structure short-circuited with one end of the load 101. A relay or a fuse may be provided in the second power path 82. The second power path 82 functions in a manner such that the other end of the first element portion 21, the other end of the fourth element portion 24, the other end of the third element portion 23, and one end of the load 101 are set to the same potential or substantially the same potential.

[0050] The third power path 83 is a power path different from the first power path 81 and the second power path 82. A portion of one end side of the third power path 83 is connected to the other end portion of the second element portion 22 (at Figure 1 The other end of the third power path 83 is electrically connected to the other end in a structure short-circuited with the other end of the semiconductor switch (i.e., the source terminal in the example). A portion of the other end of the third power path 83 is electrically connected to the one end in a structure short-circuited with the one end of the voltage conversion unit 30. A portion of the third power path 83 is electrically connected to the one end of the first element unit 21 (at Figure 1 The third power path 83 functions by, for example, setting one end of the first element unit 21, the other end of the second element unit 22, and one end of the voltage conversion unit 30 to the same potential or substantially the same potential.

[0051] The fourth power path 84 is a power path different from the first power path 81, the second power path 82, and the third power path 83, and is a power path to which a voltage based on the power storage unit 92 is applied. A portion of one end side of the fourth power path 84 is electrically connected to the other end side of the voltage conversion unit 30 in a short-circuited manner. A portion of the other end side of the fourth power path 84 is electrically connected to the positive electrode of the power storage unit 92 in a short-circuited manner. A portion of the fourth power path 84 is electrically connected to one end side of the third element unit 23 (at Figure 1 The fourth power path 84 functions by, for example, setting the other end of the voltage conversion unit 30, the positive electrode of the power storage unit 92, and one end of the third element unit 23 to the same potential or substantially the same potential.

[0052] 3. Details of the vehicle-mounted control device The vehicle-mounted control device 10 is used in the vehicle-mounted system 2, and is a device that controls the power supply from the power storage unit 92. The vehicle-mounted control device 10 is a backup control device that can control the backup operation of outputting the power based on the power storage unit 92. The vehicle-mounted control device 10 includes a first power path 81, a second power path 82, a third power path 83, a fourth power path 84, a control unit 16, a voltage conversion unit 30, a first element unit 21, a second element unit 22, a third element unit 23, a fourth element unit 24, voltage detection units 41, 43, 44, etc.

[0053] In the representative example, the vehicle-mounted control device 10 includes a first power path 81 , a second power path 82 , a third power path 83 , and a fourth power path 84 , but may include only a portion of each, and some or all of the power paths may not be elements of the vehicle-mounted control device 10 .

[0054] exist Figure 1 In the representative example, the first element portion 21 is composed of two semiconductor switches 21A and 21B. The second element portion 22 is composed of one semiconductor switch. The third element portion 23 is composed of two semiconductor switches 23A and 23B. The fourth element portion 24 is composed of two semiconductor switches 24A and 24B. Figure 1 In the example of , the semiconductor switches 21A, 21B, 22, 23A, 23B, 24A, and 24B are all formed of N-channel FETs (Field Effect Transistors).

[0055] The first element unit 21 is a switch unit that allows current to flow from the voltage conversion unit 30 side to the second power path 82 side and blocks current from flowing from the second power path 82 side to the voltage conversion unit 30 side. The semiconductor switches 21A and 21B constituting the first element unit 21 are connected in opposite directions. Figure 1 In the example, the drain of the semiconductor switch 21A is short-circuited with the third power path 83, the drain of the semiconductor switch 21B is short-circuited with the second power path 82, and the source of the semiconductor switch 21A is short-circuited with the source of the semiconductor switch 21B. The first element unit 21 is in the off state, which means that both the semiconductor switches 21A and 21B are in the off state. When the first element unit 21 is in the off state, the energization through the first element unit 21 is bidirectionally cut off, and the current flowing from the second power path 82 side to the voltage conversion unit 30 side and the current flowing from the voltage conversion unit 30 side to the second power path 82 side are both cut off. The first element unit 21 is in the on state, which means that both the semiconductor switches 21A and 21B are in the on state. When the first element unit 21 is in the on state, the energization through the first element unit 21 is allowed in both directions, and the current flowing from the second power path 82 side to the voltage conversion unit 30 side and the current flowing from the voltage conversion unit 30 side to the second power path 82 side are allowed.

[0056] The second element unit 22 is a structure that allows current to flow from the first power path 81 side to the voltage conversion unit 30 side, and is a structure that blocks current from flowing from the voltage conversion unit 30 side to the first power path 81 side. Figure 1 In the example of FIG. 1 , the drain of the second element portion 22 is electrically connected to the third power path 83 in a short-circuited manner, and the source of the second element portion 22 is electrically connected to the first power path 81 in a short-circuited manner. When the second element portion 22 is in the on state, power is bidirectionally allowed to flow through the second element portion 22. When the second element portion 22 is in the off state, the current flowing from the voltage conversion portion 30 side to the first power path 81 side through the second element portion 22 is always cut off.

[0057] The third element unit 23 is a switch unit that allows current to flow from the power storage unit 92 side to the second power path 82 side and blocks current from flowing from the second power path 82 side to the power storage unit 92 side. The semiconductor switches 23A and 23B constituting the third element unit 23 are connected in opposite directions. Figure 1In the example, the drain of the semiconductor switch 23A is short-circuited with the fourth power path 84, the drain of the semiconductor switch 23B is short-circuited with the second power path 82, and the source of the semiconductor switch 24A is short-circuited with the source of the semiconductor switch 24B. The third element unit 23 is in the off state, which means that both the semiconductor switches 23A and 23B are in the off state. When the third element unit 23 is in the off state, the energization through the third element unit 23 is bidirectionally cut off, and the current flowing from the second power path 82 side to the power storage unit 92 side through the third element unit 23 and the current flowing from the power storage unit 92 side to the second power path 82 side through the third element unit 23 are both cut off. The third element unit 23 is in the on state, which means that both the semiconductor switches 23A and 23B are in the on state. When the third element unit 23 is in the on state, the energization through the third element unit 23 is allowed in both directions, and the current flowing from the second power path 82 side to the power storage unit 92 side and the current flowing from the voltage conversion unit 30 side to the power storage unit 92 side are both allowed.

[0058] The fourth element unit 24 is a switch unit that allows current to flow from the first power path 81 side to the second power path 82 side and blocks current from flowing from the second power path 82 side to the first power path 81 side. The semiconductor switches 24A and 24B constituting the fourth element unit 24 are connected in opposite directions. Figure 1 In the example, the drain of the semiconductor switch 24A is short-circuited with the first power path 81, the drain of the semiconductor switch 24B is short-circuited with the second power path 82, and the source of the semiconductor switch 24A is short-circuited with the source of the semiconductor switch 24B. The fourth element unit 24 is in the off state, which means that both the semiconductor switches 24A and 24B are in the off state. When the fourth element unit 24 is in the off state, the energization through the fourth element unit 24 is cut off in both directions, and the current flowing from the first power path 81 side to the second power path 82 side through the fourth element unit 24 and the current flowing from the second power path 82 side to the first power path 81 side through the fourth element unit 24 are both cut off. The fourth element unit 24 is in the on state, which means that both the semiconductor switches 24A and 24B are in the on state. When the fourth element unit 24 is in the on state, the energization through the fourth element unit 24 is allowed in both directions, and the current flowing from the first power path 81 side to the second power path 82 side and the current flowing from the second power path 82 side to the first power path 81 side are both allowed.

[0059] The voltage conversion unit 30 is composed of a known voltage conversion circuit such as a DCDC converter. Figure 1In the example of FIG. 1 , the voltage conversion unit 30 performs voltage conversion between the third power path 83 and the fourth power path 84. The voltage conversion unit 30 is a device that performs a first conversion operation, the first conversion operation is an operation of performing voltage conversion in a manner of stepping up or down the voltage applied to the third power path 83 and applying an output voltage to the fourth power path 84, and a second conversion operation is an operation of performing voltage conversion in a manner of stepping up or down the voltage applied to the fourth power path 84 and applying an output voltage to the third power path 83. In this way, the voltage conversion unit 30 performs voltage conversion in both directions. The operation of the voltage conversion unit 30 is controlled by the control unit 16.

[0060] The control unit 16 is a device that controls the voltage conversion unit 30, the first element unit 21, the second element unit 22, the third element unit 23, the fourth element unit 24, etc. The control unit 16 has an information processing device with information processing functions, calculation functions, control functions, etc., and can be composed of the information processing device, or can be composed of the information processing device and other devices. For example, the control unit 16 can be a common control device that controls the voltage conversion unit 30, the first element unit 21, the second element unit 22, the third element unit 23, and the fourth element unit 24, or the device that controls a certain part can be different from the device that controls another part.

[0061] The voltage detection unit 41 is a circuit that provides a detection value (e.g., an analog voltage value) that can determine the value of the voltage applied to the first power path 81 to the control unit 16. The voltage detection unit 43 is a circuit that provides a detection value (e.g., an analog voltage value) that can determine the value of the voltage applied to the third power path 83 to the control unit 16. The voltage detection unit 44 is a circuit that provides a detection value (e.g., an analog voltage value) that can determine the value of the voltage applied to the fourth power path 84 to the control unit 16.

[0062] 4. Operation of the vehicle-mounted control device The following description relates to control for the backup operation performed by the vehicle-mounted control device 10 . Figure 2 This is a flowchart illustrating the flow of control for backup operation.

[0063] When a predetermined start condition is met, the control unit 16 starts Figure 2 The above-mentioned "starting condition" may be, for example, a condition such as "the vehicle is in the startup state", or a predetermined instruction is given from an external device (for example, an external ECU), or other conditions. In the representative example described below, the control unit 16 determines that the above-mentioned starting condition is satisfied when the vehicle equipped with the vehicle-mounted system 2 is in the startup state, and starts Figure 2The vehicle is in the start state when, for example, a start switch such as an ignition switch in a hybrid vehicle or a power switch in an electric vehicle is switched from an off state to an on state.

[0064] In addition, the control unit 16 may also start Figure 2 Under control, continue Figure 2 The control ends when the specified end condition is met. Figure 2 The predetermined termination condition may be, for example, the vehicle's start switch being switched from an on state to an off state, or other conditions.

[0065] The control unit 16 starts Figure 2 In the case of the control for the backup action shown in the figure, it is determined in step S1 whether the voltage of the first power path 81 is less than the low voltage threshold value Vth1. The low voltage threshold value Vth1 is equivalent to an example of the first threshold value. When the control unit 16 determines in step S1 that the voltage of the first power path 81 is not less than the low voltage threshold value Vth1, it is determined in step S2 whether the voltage of the first power path 81 is greater than the overvoltage threshold value Vth3. The overvoltage threshold value Vth3 is equivalent to an example of a voltage threshold. When the control unit 16 determines in step S2 that the voltage of the first power path 81 is not greater than the overvoltage threshold value Vth3, in step S3, the first element unit 21 is set to the off state, the second element unit 22 is set to the on state, the third element unit 23 is set to the off state, and the fourth element unit 24 is set to the on state.

[0066] Thus, when the voltage of the first power path 81 exceeds the low voltage threshold Vth1 (first threshold) and is lower than the overvoltage threshold Vth3 (voltage threshold) which is larger than the low voltage threshold Vth1 , the control unit 16 turns on the fourth element unit 24 .

[0067] After step S3, the control unit 16 determines in step S4 whether the fourth element unit 24 is abnormal. For example, the control unit 16 may determine that the fourth element unit 24 is abnormal when the voltage of the second power path 82 immediately after step S3 is less than a predetermined reference value. Alternatively, the control unit 16 may determine that the fourth element unit 24 is abnormal when the voltage applied to the gate of the fourth element unit 24 is a cut-off voltage during the conduction control of the fourth element unit 24. Alternatively, the control unit 16 may determine that the fourth element unit 24 is abnormal when there is a temperature abnormality such as the temperature near the fourth element unit 24 exceeds the threshold temperature. In the present embodiment, the control unit 16 is equivalent to an example of an abnormality detection unit, and has a function of detecting an abnormality of the fourth element unit 24.

[0068] When the control unit 16 determines in step S4 that there is no abnormality in the fourth element unit 24, it determines in step S5 whether the charging condition is satisfied. In a representative example, the case where the voltage of the fourth power path 84 is less than the prescribed value at least in the state where the voltage conversion unit 30 stops the charging operation (the state where the first conversion operation is not performed) is a case where the charging condition is satisfied. The control unit 16 determines in step S4 whether the above-mentioned charging condition is satisfied, and enters the process into step S6 if it is determined that the charging condition is satisfied, and enters the process into step S7 if it is determined that the charging condition is not satisfied. In addition, in a representative example, the case where the voltage of the fourth power path 84 is greater than the full charging voltage greater than the prescribed value (lower limit voltage) is a case where the charging condition is not satisfied, and the case where the voltage of the fourth power path is greater than the prescribed value during the stop period of the first conversion operation is a multiple that does not satisfy the charging condition. On the other hand, the case where the voltage of the fourth power path does not become greater than the full charging voltage in the first conversion operation is a case where the charging condition is satisfied.

[0069] When the control unit 16 advances the process to step S6, in step S6, the voltage conversion unit 30 performs a first conversion operation. The first conversion operation is a step-down operation or a step-up operation of applying a first target value of the output voltage to the fourth power path 84. The first target value is, for example, greater than the above-mentioned predetermined value. When the process of step S6 is performed, Figure 3 When the control unit 16 advances the process to step S7, the control unit 16 stops the voltage conversion unit 30 in step S7. Figure 4 1 is an explanatory diagram showing various changes in a normal state in which the voltage of the first power path 81 exceeds the low voltage threshold value Vth1 (first threshold value) and is less than the overvoltage threshold value Vth3 (voltage threshold value) which is larger than the low voltage threshold value Vth1. Figure 4 In the example, at time t11, the above start condition is met and the start Figure 2 In this example, after the start condition is met at time t11, the first conversion action (charging action) is performed during the period t11-12 and t13-t14 when the above-mentioned charging condition is met, and the first conversion action (charging action) is performed during the period t12-13 and t14-t15 when the above-mentioned charging condition is not met.

[0070] Thus, in the present embodiment, when the voltage of the first power path 81 exceeds the low voltage threshold value Vth1 (first threshold value) and the output voltage of the power storage unit 92 is below a predetermined value, current is allowed to flow from the first power path 81 side to the voltage conversion unit 30 side in the second element unit 22, and the control unit 16 causes the voltage conversion unit 30 to perform a first conversion operation.

[0071] When the control unit 16 determines in step S4 that the fourth element unit 24 is abnormal, in step S8, the first element unit 21 is set to the on state, the second element unit 22 is set to the on state, the third element unit 23 is set to the off state, and the fourth element unit 24 is set to the on state. After step S8, the control unit 16 notifies an external device (for example, an external ECU) of the abnormality of the fourth element unit 24 in step S9. Thus, in the present embodiment, when the above-mentioned abnormality detection unit detects an abnormality in the fourth element unit 24, current is allowed to flow from the first power path 81 side to the third power path 83 side in the second element unit 22, and the control unit 16 turns the first element unit 21 to the on state. When the control unit 16 performs the action as in step S4, as Fig.10 As shown, the fourth element portion 24 can be turned off, and power can be supplied to the second power path via the second element portion 22 and the first element portion 21. Fig.10 In the case of such an operation, the voltage conversion unit 30 may be always stopped, or may be controlled so as to perform the first conversion operation when the voltage of the fourth power path 84 drops to or below the predetermined value. Fig.11 This is an example of a case where an abnormality in the fourth element portion 24 is confirmed. Fig.11 In the example, the above-mentioned normal state is in progress before time t41, and an abnormality of the fourth element unit 24 is confirmed at time t41. In this example, the first element unit 21 is set to an off state before time t41, and the first element unit 21 is set to an on state after time t41, thereby ensuring that the current flows to the second power path 82 through the first element unit 21. Fig.11 In the representative examples shown in FIG. 1 and FIG. 2 , the fourth element portion 24 is turned on even after the fourth element portion 24 detects an abnormality. However, the fourth element portion 24 may be switched to an off state when an abnormality of the fourth element portion 24 is detected.

[0072] When the control unit 16 determines in step S2 that the voltage of the first power path 81 is above the above-mentioned overvoltage threshold (voltage threshold), in step S10, the first element unit 21 is set to the off state, the second element unit 22 is set to the on state, the third element unit 23 is set to the on state, and the fourth element unit 24 is set to the off state. After step S10, the control unit 16 performs a first conversion action in step S11. In this way, in the present embodiment, when the voltage of the first power path 81 is above the above-mentioned overvoltage threshold (voltage threshold), current can be allowed to flow from the storage unit 92 side to the second power path 82 side in the third element unit 23, and the control unit 16 causes the voltage conversion unit to perform the first conversion action. Furthermore, when the control unit 16 performs actions such as steps S10 and S11, as shown in FIG. Fig.12As shown, the fourth element unit 24 and the first element unit 21 can be turned off, the first conversion operation is performed, and the power based on the storage unit 92 is supplied to the second power path 82 via the third element unit 23. After step S11, the control unit 16 determines whether the voltage of the first power path 81 is less than the overvoltage threshold. If it is determined that the voltage of the first power path 81 is greater than the overvoltage threshold, the control unit 16 enters "No" in step S12 and continues the first conversion operation. If the control unit 16 determines that the voltage of the first power path 81 is less than the overvoltage threshold in step S12, the control unit 16 can enter "Yes" in step S12, the process enters step S3, and the process is then carried out as a normal state.

[0073] Fig.13 is an example of an overvoltage state occurring in the first power path 81. Fig.13 In the example, the normal state is as described above before time t51, the voltage of the first power path 81 is above the overvoltage threshold (voltage threshold) at time t51, and it is determined that the voltage of the first power path 81 is less than the overvoltage threshold (voltage threshold) at time t52. In such an example, during the period from time t51 to time t52, the first conversion operation is performed while power is supplied via the third element unit 23, and the current supply via the fourth element unit 24 is stopped. On the other hand, after time t52, normal operation is returned, and current can be supplied via the fourth element unit 24. In this way, in the present structure, when the voltage of the first power path 81 is above the overvoltage threshold Vth3 (voltage threshold), the current is allowed to flow from the storage unit 92 side to the second power path 82 side in the third element unit 23, and the control unit 16 makes the fourth element unit 24 into the cut-off state.

[0074] When the control unit 16 determines in step S1 that the voltage of the first power path 81 is below the low voltage threshold (first threshold), in step S13, the first element unit 21 is set to the off state, the second element unit 22 is set to the on state, the third element unit 23 is set to the on state, and the fourth element unit 24 is set to the off state. After step S13, the control unit 16 determines in step S14 whether the failure condition is satisfied. If the failure condition is not satisfied, the control unit 16 performs the first switching operation in step S15. When the control unit 16 performs the operation as in step S15, as in Figure 5 As shown, the fourth element unit 24 and the first element unit 21 are turned off, and the electric power from the storage unit 92 can be supplied to the second power path 82 via the third element unit 23 while the first conversion operation is performed. Figure 6 The example is an example of a case where the voltage of the first power path 81 is lower than the above-mentioned low voltage threshold (first threshold) and the failure determination condition is not satisfied. Figure 6In the example, at time t21, the voltage of the first power path 81 is below the low voltage threshold (first threshold), and the failure determination condition is not satisfied. At time t22, the voltage of the first power path 81 recovers to exceed the low voltage threshold (first threshold). In this example, during the period from time t21 to time t22, the failure determination condition can be satisfied. Figure 5 By operating in this way, after time t22, the operation can be performed in the same manner as in the above-mentioned normal state.

[0075] When the control unit 16 determines that the failure condition is satisfied in step S14, in step S16, the first element unit 21 is set to the off state, the second element unit 22 is set to the off state, the third element unit 23 is set to the on state, and the fourth element unit 24 is set to the off state. After step S16, the control unit 16 performs the second conversion action in step S17. After step S17, the control unit 16 determines whether the stop condition is satisfied in step S18. If satisfied, the action of each element unit performed in step S16 is continued and the second conversion action is continued. When the control unit 16 determines that the stop condition is satisfied in step S18, in step S19, the first element unit 21 is set to the on state, the second element unit 22 is set to the off state, the third element unit 23 is set to the off state, and the fourth element unit 24 is set to the off state. In the case of entering "Yes" in step S18, if Figure 7 When the power supply is performed in step S19, Figure 8 The stop condition may be that the voltage of the third power path 83 exceeds a certain value, or that a certain time has passed since the start of the second conversion operation in step S17, or other conditions.

[0076] Fig. 9 An example in which the determination result in step S14 is "Yes" will be described. Fig. 9 In the example, at time t31, the voltage becomes the low voltage threshold Vt1, and after time t31, Figure 2 In the control of step S1, it is determined as "yes". The period from time t31 to time t32 is a period during which the failure determination condition is not satisfied. During this period, it is determined as "no" in step S14, and the processing of step S15 is continued. The period from time t32 to time t33 is a period during which the stop condition is not satisfied when the failure determination condition is satisfied. After time t33, it is a period during which the stop condition is satisfied when the failure determination condition is satisfied.

[0077] Thus, in this configuration, when the voltage of the first power path 81 is below the first threshold, the current is allowed to flow from the storage unit 92 side to the second power path 82 side in the third element unit 23, and the control unit 16 turns the fourth element unit 24 off. Furthermore, when the voltage of the first power path 81 is below the first threshold, when the predetermined condition is satisfied, such as Figure 5 As shown, in the third element unit 23 , current is allowed to flow from the power storage unit 92 side to the second power path 82 side, and the control unit 16 causes the voltage conversion unit 30 to perform the first conversion operation.

[0078] In this specification, the above-mentioned prescribed conditions include the condition that the predetermined failure determination condition does not hold. That is, under the condition that the failure determination condition does not hold when the voltage of the first power path 81 is below the first threshold, the current is allowed to flow from the first power path 81 side to the voltage conversion unit 30 side in the second element unit 22, and the control unit 16 operates in a manner that causes the voltage conversion unit 30 to perform the first conversion operation. On the other hand, when the failure determination condition holds when the voltage of the first power path 81 is below the first threshold, the current is cut off from the voltage conversion unit 30 side to the first power path 81 side in the second element unit 22 and the current is allowed to flow from the third power path 83 side to the second power path 82 side in the first element unit 21, and the control unit 16 causes the voltage conversion unit 30 to perform the second conversion operation.

[0079] Furthermore, when the voltage of the first power path 81 is below the first threshold value, when a switch occurs from a state where the failure determination condition is not satisfied to a state where the failure determination condition is satisfied, the control unit 16 maintains the third element unit 23 in an on state before and after the switch, and after the switch, cuts off the current from the voltage conversion unit 30 side to the first power path 81 side in the second element unit 22, and allows the current to flow from the third power path 83 side to the second power path 82 side in the first element unit 21, and the control unit 16 causes the voltage conversion unit 30 to perform a second conversion operation, and when the voltage conversion unit 30 satisfies the prescribed operation conditions after the switch, the control unit 16 can operate by switching the third element unit 23 to the off state.

[0080] In the representative example, the above-mentioned failure determination condition includes a condition that current flows from the voltage conversion unit 30 side to the first power path 81 side via the second element unit 22. That is, in the representative example, the process of step S15 is performed on the condition that current does not flow from the voltage conversion unit 30 side to the first power path 81 side via the second element unit 22 when the voltage of the first power path 81 is less than the first threshold value, and the current is allowed to flow from the first power path 81 side to the voltage conversion unit 30 side in the second element unit 22, and the control unit 16 causes the voltage conversion unit 30 to perform the first conversion operation, and the current is allowed to flow from the storage unit 92 side to the second power path 82 side in the third element unit 23. On the other hand, when the voltage of the first power path 81 is below the first threshold value and the current flows from the voltage conversion unit 30 side to the first power path 81 side via the second element unit 22, the processing after step S16 is performed, the current flowing from the voltage conversion unit 30 side to the first power path 81 side is cut off in the second element unit 22, the current is allowed to flow from the third power path 83 side to the second power path 82 side in the first element unit 21, and the control unit 16 causes the voltage conversion unit 30 to perform a second conversion action.

[0081] The failure determination condition may also include a condition that the voltage of the first power path 81 becomes lower than the second threshold value Vth2 which is lower than the low voltage threshold value Vth1 (first threshold value). In this case, the processing of step S15 is performed on the condition that the voltage of the first power path 81 is lower than the low voltage threshold value Vth1 (first threshold value) and exceeds the second threshold value Vth2, and the current is allowed to flow from the first power path 81 side to the voltage conversion unit 30 side in the second element unit 22, and the control unit 16 causes the voltage conversion unit 30 to perform the first conversion operation, and the current is allowed to flow from the power storage unit 92 side to the second power path 82 side in the third element unit 23. And, when the voltage of the first power path 81 is lower than the second threshold value, the processing after step S16 is performed, the current is cut off from the voltage conversion unit 30 side to the first power path 81 side in the second element unit 22, and the current is allowed to flow from the third power path 83 side to the second power path 82 side in the first element unit 21, and the control unit 16 causes the voltage conversion unit 30 to perform the second conversion operation.

[0082] The failure determination condition may also include a condition that a predetermined failure signal is provided to the vehicle-mounted control device 10 from an external device (for example, an external ECU) different from the vehicle-mounted control device 10. In this example, under the condition that the voltage of the first power path 81 is less than the first threshold value and the failure signal is not provided from the external device, the process of step S15 is performed, the current is allowed to flow from the first power path 81 side to the voltage conversion unit 30 side in the second element unit 22, and the control unit 16 causes the voltage conversion unit 30 to perform the first conversion operation, and the current is allowed to flow from the power storage unit 92 side to the second power path 82 side in the third element unit 23. On the other hand, when the voltage of the first power path 81 is less than the first threshold value and the failure signal is provided from the external device, the process after step S16 is performed, the current is cut off from the voltage conversion unit 30 side to the first power path 81 side in the second element unit 22, the current is allowed to flow from the third power path 83 side to the second power path 82 side in the first element unit 21, and the control unit 16 causes the voltage conversion unit 30 to perform the second conversion operation.

[0083] In the present embodiment, during the period when the processing of step S10, the processing of step S15, etc. is performed to allow the current in the third element unit 23 to flow from the storage unit 92 side to the second power path 82 side and the voltage conversion unit 30 performs the first conversion action, the control unit 16 makes the power supplied from the voltage conversion unit 30 to the fourth power path 84 side greater than the power supplied to the second power path 82 side via the third element unit 23.

[0084] 5. Effect Examples The vehicle-mounted control device 10 can apply a desired voltage to the fourth power path 84 and charge the power storage unit 92 by causing the voltage conversion unit 30 to perform the first conversion operation in a state where the second element unit 22 allows current to flow from the first power path 81 side to the voltage conversion unit 30 side. On the other hand, by causing the voltage conversion unit 30 to perform the second conversion operation in a state where the first element unit 21 allows current to flow from the voltage conversion unit 30 side to the second power path 82 side, a desired voltage can be applied to the third power path 83 and power can be supplied to the second power path 82. That is, the vehicle-mounted control device 10 can adjust the charging voltage when charging the power storage unit 92 and the discharging voltage when discharging the power storage unit 92 with a simpler structure, and the second element unit 22 can cut off the current from the voltage conversion unit 30 side to the first power path 81 side according to the situation. In addition, the third element unit 23 is provided to allow current to flow from the power storage unit 92 side to the second power path 82 side, so that the power storage unit 92 can be discharged through a path different from the path where the voltage is adjusted by the voltage conversion unit 30. Furthermore, the third element unit 23 can block the current from flowing from the second power path 82 to the power storage unit 92 , and thus can block the current from flowing from the second power path 82 to the power storage unit 92 via the third element unit 23 , depending on circumstances.

[0085] In the vehicle-mounted control device 10, the fourth element unit 24 can allow current to flow from the first power path 81 side to the second power path 82 side, so that the power based on the power supply unit 91 can be directly supplied to the second power path 82 via the fourth element unit 24. On the other hand, depending on the situation, the fourth element unit 24 can cut off the current from the second power path 82 side to the first power path 81 side.

[0086] The vehicle-mounted control device 10 can directly supply the power from the power supply unit 91 to the second power path 82 with reduced loss by turning on the fourth element unit 24 when the voltage of the first power path 81 exceeds the first threshold value. On the other hand, when the voltage of the first power path 81 is equal to or lower than the first threshold value, the third element unit 23 allows the current to flow from the power storage unit 92 side to the second power path 82 side, and the control unit 16 can turn off the fourth element unit 24, so that the influence of the first power path 81 can be suppressed from spreading to the second power path 82 via the fourth element unit 24, and the discharge current can flow from the power storage unit 92 to the second power path 82 via the third element unit 23.

[0087] When the abnormality detection unit detects an abnormality in the fourth element unit 24, the vehicle-mounted control device 10 allows the current to flow from the first power path 81 side to the third power path 83 side in the second element unit 22, and the control unit 16 can turn on the first element unit 21, so that power can be supplied from the first power path 81 side to the second power path 82 side using the path of the second element unit 22 and the first element unit 21. On the other hand, the first element unit 21 can also be turned off, in which case, it is possible to prevent the current from flowing from the second power path 82 side to the third power path 83 side via the first element unit 21.

[0088] The vehicle-mounted control device 10 turns on the fourth element unit 24 when the voltage of the first power path 81 is large enough to exceed the first threshold value but not large enough to reach the voltage threshold value, thereby enabling the power from the power supply unit 91 to be directly supplied to the second power path 82 with reduced loss. On the other hand, when the voltage of the first power path 81 excessively rises to a level exceeding the voltage threshold value, the third element unit 23 allows the current to flow from the power storage unit 92 side to the second power path 82 side and turns off the fourth element unit 24, thereby enabling the influence of the overvoltage of the first power path 81 to be suppressed from spreading to the second power path 82 via the fourth element unit 24, and allowing the discharge current to flow from the power storage unit 92 to the second power path 82 via the third element unit 23.

[0089] Even when the voltage of the first power path 81 drops below the first threshold value, the vehicle-mounted control device 10 can cause the voltage conversion unit 30 to perform the first conversion action and supply power to the storage unit 92 side when the specified conditions are met. It can also supply power to the storage unit 92 side in this way and supply power to the second power path 82 side via the third element unit 23.

[0090] Even when the voltage of the first power path 81 drops below the first threshold, the vehicle-mounted control device 10 can allow the current to flow to the voltage conversion unit 30 side via the second element unit 22, and make the voltage conversion unit 30 perform the first conversion operation to charge the power storage unit 92, provided that the failure determination condition is not satisfied. On the other hand, when the failure determination condition is satisfied, the vehicle-mounted control device 10 can cut off the reverse flow to the first power path 81 side and supply the voltage adjusted based on the voltage conversion operation of the voltage conversion unit 30 to the second power path 82.

[0091] The vehicle-mounted control device 10 can quickly supply power from the power storage unit 92 to the second power path 82 by turning on the third element unit 23 when the voltage of the first power path 81 is lower than the first threshold and changes to a state where the failure determination condition is not satisfied. Furthermore, when the voltage of the first power path 81 is lower than the first threshold and a switch occurs from a state where the failure determination condition is not satisfied to a state where the failure determination condition is satisfied, after the switch, the reverse flow to the first power path 81 side can be prevented, and the power whose voltage is adjusted by the second conversion operation can be supplied to the second power path 82 via the third power path 83 and the first element unit 21. Furthermore, the vehicle-mounted control device 10 can maintain the third element unit 23 in the on state before and after the switch, so that even if the rise of the output of the voltage conversion unit 30 is delayed after the above-mentioned switch, the power supply from the power storage unit 92 to the second power path 82 via the third element unit 23 can be continued. Furthermore, the vehicle-mounted control device 10 switches the third element unit 23 to the off state when the switched voltage conversion unit 30 satisfies a predetermined operating condition, thereby narrowing the discharge path to the path of the first element unit 21 of the first element unit 21 and the third element unit 23 .

[0092] The vehicle-mounted control device 10 can charge the power storage unit 92 by causing the voltage conversion unit 30 to perform the first conversion operation after confirming that the current does not flow to the first power path 81 side via the second element unit 22, that is, the first power path 81 is not likely to be grounded, when the voltage of the first power path 81 is less than the first threshold value. In addition, the vehicle-mounted control device 10 can discharge via the third element unit 23 in parallel with the power supply to the power storage unit 92 side based on the above-mentioned first conversion operation. On the other hand, when the current flows to the first power path 81 side via the second element unit 22 when the voltage of the first power path 81 is less than the first threshold value, that is, when the first power path 81 is likely to be grounded, the current is cut off from flowing to the first power path 81 side in the second element unit 22, and the influence of the grounding can be suppressed from affecting the third power path 83 side. In addition, the current is allowed to flow to the second power path 82 side in the first element unit 21, and the voltage conversion unit 30 is caused to perform the second conversion operation, thereby suppressing the influence of the grounding and supplying the power whose voltage is adjusted by the voltage conversion unit 30 to the second power path 82.

[0093] When the voltage of the first power path 81 is less than the first threshold value, the vehicle-mounted control device 10 can make the voltage conversion unit 30 perform the first conversion operation to charge the power storage unit 92 after confirming that the voltage of the first power path 81 exceeds the second threshold value, that is, the voltage is not too low. In addition, the vehicle-mounted control device 10 can discharge through the third element unit 23 in parallel with the power supply to the power storage unit 92 side based on the above-mentioned first conversion operation. On the other hand, when the voltage of the first power path 81 is less than the second threshold value, that is, when the voltage of the first power path 81 is too low, the current can be cut off from flowing to the first power path 81 side in the second element unit 22, so that even if the first power path 81 is grounded, the influence of the grounding can be suppressed from affecting the third power path 83 side. In addition, by allowing the current to flow to the second power path 82 side in the first element unit 21 and making the voltage conversion unit 30 perform the second conversion operation, the influence of the voltage drop of the first power path 81 can be suppressed and the power whose voltage is adjusted by the voltage conversion unit 30 can be supplied to the second power path 82.

[0094] When the voltage of the first power path 81 is less than the first threshold value, the vehicle-mounted control device 10 can make the voltage conversion unit 30 perform the first conversion operation and charge the power storage unit 92 after confirming that the failure signal is not provided from the external device. In addition, the vehicle-mounted control device 10 can discharge through the third element unit 23 in parallel with the power supply to the power storage unit 92 side based on the first conversion operation. On the other hand, when the voltage of the first power path 81 is less than the first threshold value, when the failure signal is generated, the current flowing to the first power path 81 side can be cut off in the second element unit 22, and the current flowing to the second power path 82 side can be allowed in the first element unit 21, and the voltage conversion unit 30 can be made to perform the second conversion operation. Therefore, even if a ground fault or the like occurs in the first power path 81 when the failure signal is generated, the influence thereof can be suppressed, and the power whose voltage is adjusted by the voltage conversion unit 30 can be supplied to the second power path 82.

[0095] When the vehicle-mounted control device 10 performs the first conversion operation and the discharge via the third element unit 23 in parallel, the charging power based on the first conversion operation can be made larger than the discharge power via the third element unit 23. Therefore, when performing the above-mentioned parallel operation, the charging current to the power storage unit 92 can be more reliably ensured and the power can be supplied to the second conductive path.

[0096] When the output voltage of the power storage unit 92 drops to or below a predetermined value, the vehicle-mounted control device 10 can charge the power storage unit 92 through the first conversion operation.

[0097] <Second Embodiment> The following description relates to the second embodiment. Fig.14 The circuit configuration of the vehicle-mounted control device 210 of the second embodiment shown in FIG. 1 is different from that of the vehicle-mounted control device 10 of the first embodiment in that the fourth element unit 24 is not provided, and the other circuit configurations are the same as those of the vehicle-mounted control device 10. The control of the vehicle-mounted control device 210 is different from that of the vehicle-mounted control device 10 of the first embodiment in that the control of the fourth element unit 24 is omitted and the processing of steps S4, S8, and S9 is omitted. Figure 2 The control is different from that of Figure 2 The control of the vehicle-mounted control device 210 is the same. Figure 2 In the control, after step S3, the processing of step S5 is performed.

[0098] In the vehicle-mounted control device 210 of the second embodiment, when the voltage of the first power path 81 is in the above-mentioned normal state, the process of step S6 is performed. Fig.15 On the other hand, when the voltage of the first power path 81 is below the low voltage threshold and the failure determination condition is not satisfied, the process of step S15 is performed. Fig.16 When the voltage of the first power path 81 is below the low voltage threshold, the process of step S16 is performed immediately after the failure determination condition is satisfied. Fig.17 On the other hand, when the above-mentioned stop condition is satisfied and the processing of step S19 is performed, as shown in FIG. Fig.18 In this way, even if there is no Figure 1 Even in the case of the fourth element portion 24 in the structure of , control similar to that of the first embodiment can be performed.

[0099] <Third Embodiment> The following description relates to the third embodiment. Fig. 20 The circuit configuration of the vehicle-mounted control device 310 of the third embodiment shown in the figure is different from that of the vehicle-mounted control device 10 of the first embodiment in that the circuit configuration is changed to Figure 1 The second element unit 22 of the vehicle-mounted control device 10 is changed to a second element unit 322, and the other circuit structures are the same as those of the vehicle-mounted control device 10. The control performed by the vehicle-mounted control device 310 is the same as that of the first embodiment. Figure 2 The only difference in the control is that Figure 2In the steps S3, S8, and S13 of the embodiment, when the second element portion is turned on, the semiconductor switches 322A and 322B are both turned on; in the steps S16 and S19, when the second element portion is turned off, the semiconductor switches 322A and 322B are both turned off; in the step S10, the second element portion 322 is turned off; and in the step S11, the second conversion action is performed. The other controls are the same as those of the first embodiment. Figure 2 The control is the same.

[0100] exist Fig. 20 In the vehicle-mounted control device 310, the second element portion 322 is configured to bidirectionally cut off the current flowing between the first power path 81 and the third power path 83 through itself when it is in the off state, and to allow the current to flow from the first power path 81 to the third power path 83 through itself when it is in the on state. The semiconductor switches 322A and 322B constituting the second element portion 322 are connected to each other in opposite directions and are both composed of FETs. Figure 1 In the example, the drain of the semiconductor switch 322A is short-circuited with the first power path 81, the drain of the semiconductor switch 322B is short-circuited with the third power path 83, and the source of the semiconductor switch 322A is short-circuited with the source of the semiconductor switch 322B. The second element portion 322 is in the off state, which means that both the semiconductor switches 322A and 322B are in the off state. When the second element portion 322 is in the off state, the energization through the second element portion 322 is bidirectionally cut off, and the current flowing from the first power path 81 side to the third power path 83 side and the current flowing from the third power path 83 side to the first power path 81 side are both cut off. The second element portion 322 is in the on state, which means that both the semiconductor switches 322A and 322B are in the on state. When the second element portion 322 is in the on state, the energization through the second element portion 322 is allowed in both directions, and the current flowing from the first power path 81 side to the third power path 83 side and the current flowing from the third power path 83 side to the first power path 81 side are both allowed.

[0101] exist Fig. 20 In the vehicle-mounted control device 310, Figure 2 In this way, the control unit 16 turns on the second element unit 322 in step S3 under the condition that the voltage of the first power path 81 exceeds the low voltage threshold value Vth1 (first threshold value) and is lower than the overvoltage threshold value (voltage threshold value) that is larger than the low voltage threshold value Vth1 (first threshold value) (i.e., in the case of No in step S2). On the other hand, the control unit 16 turns on the second element unit 322 in step S3. Figure 2 If it is determined in step S2 that the voltage of the first power path 81 is greater than the overvoltage threshold (voltage threshold) described above, in step S10, the same Figure 2In the example of the present invention, the first element portion 21 is set to the on state, the second element portion 22 is set to the off state, the third element portion 23 is set to the on state, and the fourth element portion 24 is set to the off state. Then, in the subsequent step S11, the same Figure 2 The voltage conversion unit 30 performs a second conversion operation by performing a different process from the example. Thus, when the voltage of the first power path 81 is above the above-mentioned overvoltage threshold (voltage threshold), the control unit 16 turns the first element unit 21 into an on state to allow the current in the first element unit 21 to flow from the third power path 83 side to the second power path 82 side, and turns the second element unit 322 into an off state, in which the voltage conversion unit 30 performs a second conversion operation. When such an operation is performed, in a state where the energization between the first power path 81 and the third power path 83 is bidirectionally cut off, the voltage conversion unit 30 applies an output voltage to the third power path 83 based on the power from the power storage unit 92, and supplies power from the third power path 83 to the second power path 82. In the process of performing such a power supply operation, the fourth element unit 24 bidirectionally cuts off the energization between the first power path 81 and the second power path 82 via itself. In this example as well, the determination process of step S12 is performed after the process of step S11 , and the processes after step S3 may be performed when the voltage of the first power path 81 is lower than the overvoltage threshold value (voltage threshold value).

[0102] The above-mentioned vehicle-mounted control device 310 sets the second element unit 22 to the on-state under the condition that the voltage of the first power path 81 exceeds the low voltage threshold value Vth1 (first threshold value) and is lower than the above-mentioned overvoltage threshold value (voltage threshold value), and can supply power from the first power path 81 side to the voltage conversion unit 30 side. On the other hand, when the voltage of the first power path 81 excessively rises to or above the above-mentioned overvoltage threshold value (voltage threshold value), the second element unit 22 can be set to the off-state to cut off the power supply from the first power path 81 side to the third power path 83 side and the power supply from the third power path 83 side to the second power path 82 side via the first element unit 21, and the voltage conversion unit 30 can be made to perform the second conversion operation. Specifically, since the fourth element unit 24 is set to the off-state and the above-mentioned operation is performed, it is possible to suppress the influence of the overvoltage of the first power path 81 from affecting the second power path 82, and the power whose voltage is adjusted by the voltage conversion unit 30 can be stably supplied to the second power path 82.

[0103] <Other Implementation Methods> 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. Furthermore, the embodiments described above can also be changed as follows.

[0104] In the above-described embodiment, the power storage unit 92 is provided outside the vehicle-mounted control device 10 , but the power storage unit 92 may be included in the vehicle-mounted control device 10 .

[0105] The fourth element portion is turned on when the voltage of the first power path 81 exceeds the low voltage threshold Vth1 (first threshold) and is less than the overvoltage threshold Vth3 (voltage threshold) that is larger than the low voltage threshold Vth1. However, the fourth element portion may be turned on when the voltage of the first power path 81 exceeds the low voltage threshold Vth1 (first threshold) regardless of whether it is less than the overvoltage threshold Vth3 (voltage threshold).

[0106] In the above-mentioned embodiment, the first element portion 21 is composed of two FETs, but it may also be configured as follows. Fig.21 (A), the first element portion 21 is composed only of the diode 191. In this case, the conductive path 181A is electrically connected to the third power path 83, and the conductive path 181B is electrically connected to the second power path 82. Alternatively, Fig.21 As shown in (B), the first element unit 21 may also be a switch unit in which a switch element 192A (such as a FET) and a diode 192B are connected in series. In this case, the conductive path 182A is electrically connected to the third power path 83, and the conductive path 182B is electrically connected to the second power path 82. Alternatively, Fig.21 As shown in (C), the first element portion 21 may be only a switch element 193 (for example, a FET). In this case, the conductive path 183A is electrically connected to the third power path 83, and the conductive path 183B is electrically connected to the second power path 82. Alternatively, Fig.21 As shown in (D), the first element unit 21 may be a switch unit 194 formed of a known semiconductor switch other than FET or a mechanical relay. In this case, the conductive path 184A is electrically connected to the third power path 83 , and the conductive path 184B is electrically connected to the second power path 82 .

[0107] In the first embodiment, a single FET is provided in the second element portion 22, and in the third embodiment, two FETs are provided, but the present invention is not limited to this example. Fig.21(A) The second element portion 22 is composed only of the diode 191. In this case, the conductive path 181A is electrically connected to the first power path 81, and the conductive path 181B is the third power path 83. Alternatively, Fig.21 (B) structure, the second element unit 22 is a switch unit in which a switch element 192A (such as FET) and a diode 192B are connected in series. In this case, the conductive path 182A is electrically connected to the first power path 81, and the conductive path 182B is the third power path 83. Alternatively, it is also possible to apply Fig.21 In the configuration of (D), the second element unit 22 is a switch unit 194 composed of a known semiconductor switch other than FET or a mechanical relay. In this case, the conductive path 184A is electrically connected to the first power path 81 , and the conductive path 184B is the third power path 83 .

[0108] In the above-mentioned embodiment, two FETs are provided in the third element portion 23, but it is also possible to apply Fig.21 (A) structure, the third element portion 23 is composed of only the diode 191. In this case, the conductive path 181A is electrically connected to the fourth power path 84, and the conductive path 181B is electrically connected to the second power path 82. Alternatively, it is also possible to apply Fig.21 (B) structure, the third element unit 23 is a switch unit in which a switch element 192A (such as FET) and a diode 192B are connected in series. In this case, the conductive path 182A is electrically connected to the fourth power path 84, and the conductive path 182B is electrically connected to the second power path 82. Alternatively, it is also possible to apply Fig.21 (C) structure, the third element portion 23 is only a switch element 193 (such as FET). In this case, the conductive path 183A is electrically connected to the fourth power path 84, and the conductive path 183B is electrically connected to the second power path 82. Alternatively, it is also possible to apply Fig.21 In the configuration of (D), the third element unit 23 is a switch unit 194 formed of a known semiconductor switch other than FET or a mechanical relay. In this case, the conductive path 184A is electrically connected to the fourth power path 84 , and the conductive path 184B is electrically connected to the second power path 82 .

[0109] In the above-mentioned embodiment, two FETs are provided in the fourth element portion 24, but it is also possible to apply Fig.21 (A) The fourth element portion 24 is composed of only the diode 191. In this case, the conductive path 181A may be the first power path 81, and the conductive path 181B may be the second power path 82. Alternatively, Fig.21(B), the fourth element unit 24 is a switch unit in which a switch element 192A (such as a FET) and a diode 192B are connected in series. In this case, the conductive path 182A can be the first power path 81, and the conductive path 182B can be the second power path 82. Alternatively, Fig.21 (C) structure, the fourth element portion 24 is only a switch element 193 (for example, FET). In this case, the conductive path 183A can be the first power path 81, and the conductive path 183B can be the second power path 82. Alternatively, it is also possible to apply Fig.21 In the configuration of (D), the fourth element unit 24 is a switch unit 194 composed of a known semiconductor switch other than FET or a mechanical relay. In this case, the conductive path 184A may be the first power path 81 , and the conductive path 184B may be the second power path 82 .

[0110] The vehicle-mounted control device 310 of the third embodiment is a structure in which the second element unit 22 of the vehicle-mounted control device 10 of the first embodiment is changed to a second element unit 322, but the vehicle-mounted control device 210 may be configured in a manner in which the second element unit 22 in the vehicle-mounted control device 210 of the second embodiment is changed to the same as the second element unit 322. In this example, the processing other than steps S10 to S12 is performed in the same manner as the second embodiment, the processing of steps S10 to S12 is performed in the same manner as the third embodiment, and the control of the fourth element unit is omitted, which is different from the third embodiment.

[0111] 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 indicated by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims. Description of Reference Numerals

[0112] 2: In-vehicle system,

[0113] 3: Vehicle power supply system,

[0114] 10: Vehicle-mounted control device,

[0115] 16: Control Department,

[0116] 21: The first component part,

[0117] 21A: semiconductor switch,

[0118] 21B: semiconductor switch,

[0119] 22: The second component part,

[0120] 23: The third component part,

[0121] 23A: semiconductor switch,

[0122] 23B: semiconductor switch,

[0123] 24: The fourth component part,

[0124] 24A: semiconductor switch,

[0125] 24B: semiconductor switch,

[0126] 30: voltage conversion unit,

[0127] 41: Voltage detection unit,

[0128] 43: Voltage detection unit,

[0129] 44: voltage detection unit,

[0130] 80: Power path,

[0131] 81: first power path,

[0132] 82: second power path,

[0133] 83: The third power path,

[0134] 84: Fourth power path,

[0135] 89: Conductive path,

[0136] 91: Power supply department,

[0137] 92: Power storage unit,

[0138] 101: load,

[0139] 210: Vehicle-mounted control device,

[0140] 310: Vehicle-mounted control device,

[0141] 322: Second component part,

[0142] 322A: Semiconductor switch,

[0143] 322B: Semiconductor switch.

Claims

1. A vehicle-mounted control device, used in a vehicle-mounted system, for controlling power supply from a power storage unit, The vehicle-mounted system comprises: A power supply unit, which supplies electricity; The power storage unit is different from the power supply unit; A first power path to which a voltage based on the power supply unit is applied; a second power path, which is a path for supplying the power supplied from the first power path to a load; a third power path, different from the first power path and the second power path; as well as a fourth power path to which a voltage based on the power storage unit is applied, The vehicle-mounted control device comprises: a voltage conversion unit that performs a first conversion operation and a second conversion operation, wherein the first conversion operation is an operation of converting a voltage applied to the third power path and applying an output voltage to the fourth power path, and the second conversion operation is an operation of converting a voltage applied to the fourth power path and applying an output voltage to the third power path; A control unit, controlling the voltage conversion unit; a first element unit capable of allowing current to flow from the voltage conversion unit side to the second power path side and capable of blocking current flowing from the second power path side to the voltage conversion unit side; a second element unit capable of allowing current to flow from the first power path side to the voltage conversion unit side and capable of blocking current flowing from the voltage conversion unit side to the first power path side; as well as The third element unit can allow current to flow from the power storage unit side to the second power path side, and can block current flowing from the second power path side to the power storage unit side.

2. The vehicle-mounted control device according to claim 1, wherein: The vehicle-mounted control device includes a fourth element portion capable of allowing current to flow from the first power path side to the second power path side and capable of blocking current flowing from the second power path side to the first power path side.

3. The vehicle-mounted control device according to claim 2, wherein: The fourth element portion is configured to bidirectionally cut off the current flowing between the first power path and the second power path through itself when it is in the off state, and to allow the current to flow from the first power path to the second power path through itself when it is in the on state, When the voltage of the first power path exceeds a first threshold value, the control unit turns on the fourth element unit. When the voltage of the first power path is equal to or lower than the first threshold, the third element portion allows current to flow from the power storage portion to the second power path, and the control portion turns off the fourth element portion.

4. The vehicle-mounted control device according to claim 2 or 3, wherein: The vehicle-mounted control device includes an abnormality detection unit for detecting abnormality of the fourth element unit. The first element portion is configured to bidirectionally cut off the current flowing between the third power path and the second power path through itself when it is in the off state, and to allow the current to flow from the third power path to the second power path through itself when it is in the on state, When the abnormality detection unit detects an abnormality in the fourth element unit, the control unit allows current to flow from the first power path side to the third power path side in the second element unit, and turns on the first element unit.

5. The vehicle-mounted control device according to claim 2 or 3, wherein: The fourth element portion is configured to bidirectionally cut off the current flowing between the first power path and the second power path through itself when it is in the off state, and to allow the current to flow from the first power path to the second power path through itself when it is in the on state, When the voltage of the first power path exceeds a first threshold value and is lower than a voltage threshold value greater than the first threshold value, the control unit turns on the fourth element unit. When the voltage of the first power path is equal to or higher than the voltage threshold, the third element portion allows current to flow from the power storage portion to the second power path side, and the control portion turns off the fourth element portion.

6. The vehicle-mounted control device according to claim 5, wherein: When the voltage of the first power path is equal to or higher than the voltage threshold, the third element unit allows current to flow from the power storage unit to the second power path, and the control unit causes the voltage conversion unit to perform the first conversion operation.

7. The vehicle-mounted control device according to any one of claims 1 to 3, wherein: The second element portion is configured to bidirectionally cut off the current flowing between the first power path and the third power path through itself when it is in the off state, and to allow the current to flow from the first power path to the third power path through itself when it is in the on state, The control unit turns the second element unit into an on state under the condition that the voltage of the first power path exceeds a first threshold value and is less than a voltage threshold value greater than the first threshold value, When the voltage of the first power path is greater than or equal to the voltage threshold, the first element unit allows current to flow from the third power path side to the second power path side, and the control unit turns the second element unit into an off state to cause the voltage conversion unit to perform the second conversion operation.

8. The vehicle-mounted control device according to claim 1, wherein: When a predetermined condition is satisfied when the voltage of the first power path is equal to or lower than a first threshold, the third element unit allows current to flow from the power storage unit to the second power path, and the control unit causes the voltage conversion unit to perform the first conversion operation.

9. The vehicle-mounted control device according to claim 8, wherein: The prescribed condition includes a condition that a predetermined failure determination condition does not hold. When the voltage of the first power path is less than or equal to the first threshold value, the control unit allows the current to flow from the first power path side to the voltage conversion unit side in the second element unit on the condition that the failure determination condition is not satisfied, and the control unit causes the voltage conversion unit to perform the first conversion operation. When the failure judgment condition is met when the voltage of the first power path is below the first threshold, the current flowing from the voltage conversion unit side to the first power path side is cut off in the second element unit and the current is allowed to flow from the third power path side to the second power path side in the first element unit, and the control unit causes the voltage conversion unit to perform the second conversion action.

10. The vehicle-mounted control device according to claim 9, wherein: The third element portion is configured to bidirectionally cut off the current flowing between the fourth power path and the second power path through itself when it is in the off state, and to allow the current to flow from the fourth power path to the second power path through itself when it is in the on state, The control unit at least controls the on / off of the third element unit. When the voltage of the first power path is below the first threshold value, when a switch occurs from a state in which the failure judgment condition is not satisfied to a state in which the failure judgment condition is satisfied, the control unit maintains the third element unit in an on state before and after the switch, and after the switch, cuts off the current flowing from the voltage conversion unit side to the first power path side in the second element unit and allows the current to flow from the third power path side to the second power path side in the first element unit, and the control unit causes the voltage conversion unit to perform the second conversion action, and when the voltage conversion unit satisfies the prescribed action conditions after the switch, the control unit switches the third element unit to an off state.

11. The vehicle-mounted control device according to claim 9 or 10, wherein: The failure determination condition includes a condition that a current flows from the voltage conversion unit side to the first power path side via the second element unit, When the voltage of the first power path is less than or equal to the first threshold value, the second element portion allows current to flow from the first power path side to the voltage conversion portion side and the control portion causes the voltage conversion portion to perform the first conversion operation, and the third element portion allows current to flow from the power storage portion side to the second power path side, on the condition that current does not flow from the voltage conversion portion side to the first power path side via the second element portion. When the voltage of the first power path is below the first threshold value, when the current flows from the voltage conversion unit side to the first power path side via the second element unit, the current flowing from the voltage conversion unit side to the first power path side is cut off in the second element unit, and the current is allowed to flow from the third power path side to the second power path side in the first element unit, and the control unit causes the voltage conversion unit to perform the second conversion action.

12. The vehicle-mounted control device according to claim 9 or 10, wherein: The failure determination condition includes a condition that the voltage of the first power path becomes equal to or lower than a second threshold value which is lower than the first threshold value. On the condition that the voltage of the first power path is less than or equal to the first threshold value and exceeds the second threshold value, the second element unit allows current to flow from the first power path side to the voltage conversion unit side and the control unit causes the voltage conversion unit to perform the first conversion operation, and the third element unit allows current to flow from the power storage unit side to the second power path side, When the voltage of the first power path is below the second threshold value, the current flowing from the voltage conversion unit side to the first power path side is cut off in the second element unit, the current is allowed to flow from the third power path side to the second power path side in the first element unit, and the control unit causes the voltage conversion unit to perform the second conversion action.

13. The vehicle-mounted control device according to claim 9 or 10, wherein: The failure determination condition includes a condition that a predetermined failure signal is provided to the vehicle-mounted control device from an external device different from the vehicle-mounted control device. On the condition that the voltage of the first power path is less than the first threshold value and the failure signal is not provided from the external device, the second element unit allows current to flow from the first power path side to the voltage conversion unit side and the control unit causes the voltage conversion unit to perform the first conversion operation, and the third element unit allows current to flow from the power storage unit side to the second power path side, When the voltage of the first power path is below the first threshold and the failure signal is provided from the external device, the current flowing from the voltage conversion unit side to the first power path side is cut off in the second element unit, the current is allowed to flow from the third power path side to the second power path side in the first element unit, and the control unit causes the voltage conversion unit to perform the second conversion action.

14. The vehicle-mounted control device according to any one of claims 8 to 10, wherein: During a period in which current is allowed to flow from the storage unit side to the second power path side in the third element unit and the voltage conversion unit is caused to perform the first conversion action, the control unit makes the power supplied from the voltage conversion unit to the fourth power path side greater than the power supplied to the second power path side via the third element unit.

15. The vehicle-mounted control device according to any one of claims 3, 8, 9, and 10, wherein: When the voltage of the first power path exceeds a first threshold value and the output voltage of the power storage unit is below a specified value, current is allowed to flow from the first power path side to the voltage conversion unit side in the second element unit, and the control unit causes the voltage conversion unit to perform the first conversion operation.

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