In-vehicle power supply device and method for manufacturing in-vehicle power supply device

Abstract

To provide a power supply device that can be available for both a vehicle carrying multiple first loads and a vehicle carrying a second load having a larger rated current than the first loads while suppressing an increase in size.SOLUTION: An on-vehicle power supply device 10 comprises: a common route 12; multiple branch paths (first branch paths 20); and a shutoff unit (first shutoff unit 25) provided in each branch path (first branch path 20). Each branch path (first branch path 20) includes an upstream conductor (first upstream conductor 21) and a downstream conductor (first downstream conductor 22). Each shutoff unit (first shutoff unit 25), which is provided between the upstream conductor (first upstream conductor 21) and the downstream conductor (first downstream conductor 22), is switched from a permissible state to a shutoff state when the shutoff condition is satisfied. The multiple downstream conductors (first downstream conductors 22) are configured to be able to be mutually connected through a conductive member 80. In each downstream conductor (first downstream conductor 22), a connection section 26 is provided to be connected to the conductive member 80.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to an in-vehicle power supply device and a method for manufacturing an in-vehicle power supply device. [Background technology]

[0002] Patent Document 1 discloses a power supply device that supplies power from a power source to a load circuit. This power supply device includes a semiconductor switch, a current detection unit, and an abnormality determination unit. The semiconductor switch is connected to a power supply line that supplies power from the power source to the load circuit. The current detection unit detects a current flowing in the power supply line. The abnormality determination unit determines an abnormality based on the current detected by the current detection unit. If the abnormality determination unit determines that an abnormality has occurred, it controls the semiconductor switch to limit the current flowing in the load circuit. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-45023 Summary of the Invention [Problem to be solved by the invention]

[0004] The rated current and number of loads mounted on a vehicle vary depending on the vehicle model, etc. If an attempt is made to configure a power supply device that can accommodate these various vehicle models, etc., using the technology of Patent Document 1, it would be necessary to provide the same number of power supply lines and semiconductor switches as the number of loads for each rated current of the load, which raises concerns about the power supply device becoming larger.

[0005] One of the objectives of the present disclosure is to provide a technology that can realize a power supply device that can accommodate both a vehicle equipped with multiple first loads and a vehicle equipped with a second load that has a higher rated current than the first loads, while preventing the device from becoming too large. [Means for solving the problem]

[0006] The in-vehicle power supply device of the present disclosure includes a common path to which power based on a power supply unit is supplied, a plurality of branch paths branched from the common path, and a cutoff unit provided in each of the branch paths. Each of the branch paths has an upstream conductor and a downstream conductor provided on a side opposite to the common path side with respect to the upstream conductor. Each of the cutoff units is provided between the upstream conductor and the downstream conductor, and switches from a permissible state that allows the flow of current from the upstream conductor side to the downstream conductor side to a cutoff state that cuts off the flow of current when a cutoff condition is satisfied. The plurality of downstream conductors can be configured to be electrically connected to each other via a conducting member. A connection portion connected to the conducting member is provided on each of the downstream conductors.

[0007] A method for manufacturing the in-vehicle power supply device of the present disclosure includes a preparation step of preparing a device main body including a common path to which power based on a power supply unit is supplied, a plurality of branch paths branched from the common path, and a cutoff unit provided in each of the branch paths. Each of the branch paths has an upstream conductor and a downstream conductor provided on a side opposite to the common path side with respect to the upstream conductor. Each of the cutoff units is provided between the upstream conductor and the downstream conductor, and switches from a permissible state that allows the flow of current from the upstream conductor side to the downstream conductor side to a cutoff state that cuts off the flow of current when a cutoff condition is satisfied. Furthermore, it includes a selection step of selecting whether to connect the downstream conductors of the plurality of branch paths by a conducting member. The selection result by the selection step is applied to the device main body to configure an in-vehicle power supply device.

Effect of the Invention

[0008] The technology according to the present disclosure can be realized while suppressing an increase in size, in a power supply device that is compatible with both a vehicle equipped with a plurality of first loads and a vehicle equipped with a second load having a rated current larger than that of the first load.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Modes for Carrying Out the Invention

[0010] Hereinafter, embodiments of the present disclosure will be listed and exemplified.

[0011] 〔1〕A common path to which power based on a power supply unit is supplied, a plurality of branch paths branched from the common path, and a cutoff unit provided in each of the branch paths, each of the branch paths has an upstream conductor and a downstream conductor provided on a side opposite to the common path side with respect to the upstream conductor, each of the cutoff units is provided between the upstream conductor and the downstream conductor, and switches from a permitted state that permits the flow of current from the upstream conductor side to the downstream conductor side to a cutoff state that cuts off the flow of current when a cutoff condition is satisfied, the plurality of downstream conductors are configured to be electrically connected to each other via a conducting member, Each of the downstream conductors is provided with a connection portion connected to the conduction member. In-vehicle power supply device.

[0012] When a plurality of downstream conductors are not connected by a conduction member, the in-vehicle power supply device configures a plurality of branch paths as separate paths. Further, when a plurality of downstream conductors are connected by a conduction member, the in-vehicle power supply device configures a path for combining currents supplied from a common path to a plurality of branch paths at the downstream conductors. That is, according to this configuration, it is possible to realize a power supply device that can cope with both a vehicle equipped with a plurality of first loads and a vehicle equipped with a second load having a rated current larger than that of the first load while suppressing an increase in size.

[0013] 〔2〕Comprising a control unit for controlling the cutoff unit, The control unit can selectively execute first control and second control, The first control determines whether or not an individual cutoff condition, which is one of the cutoff conditions, is satisfied for each of the branch paths based on the current value flowing through each of the branch paths, and switches the cutoff unit provided in the branch path determined to satisfy the individual cutoff condition to the cutoff state. This is control. The second control determines whether or not a batch cutoff condition, which is one of the cutoff conditions, is satisfied based on the current value flowing through at least one of the branch paths, and when it is determined that the batch cutoff condition is satisfied, each of the cutoff units provided in the plurality of branch paths is switched to the cutoff state. This is control. The in-vehicle power supply device according to 〔1〕.

[0014] The first control is a control assuming a configuration in which a plurality of downstream conductors are not electrically connected to each other by a conducting member, and can individually cut off a branch path for which an individual cutoff condition is satisfied. The second control is a control assuming a configuration in which a plurality of downstream conductors are electrically connected to each other by a conducting member, and can cut off a plurality of branch paths collectively when an abnormality occurs. That is, the in-vehicle power supply device can selectively execute control corresponding to each of a configuration in which a plurality of downstream conductors are electrically connected to each other by a conducting member and a configuration in which they are not electrically connected.

[0015] 〔3〕When a signal instructing which of the first control and the second control is to be executed is given from the outside to the control unit, the control unit executes the control instructed by the signal The in-vehicle power supply device according to 〔2〕.

[0016] According to this configuration, by giving a signal from the outside to the control unit, it is possible to instruct the control unit to execute the control to be executed by the control unit.

[0017] 〔4〕A determination unit that determines whether or not a plurality of the downstream conductors are in a conducting state conducted by the conducting member is provided, When the determination unit determines that the state is not a conducting state, the control unit executes the first control, and when the determination unit determines that the state is a conducting state, the control unit executes the second control The in-vehicle power supply device according to 〔2〕.

[0018] The above in-vehicle power supply device can automatically select and execute a suitable control according to whether or not it is in a conducting state.

[0019] 〔5〕In each of the branch paths, a switch unit provided between the upstream conductor and the downstream conductor is provided, When the determination start condition is satisfied, the determination unit controls the switch units provided in some of the plurality of branch paths to be in an on state and controls the switch units provided in the other branch paths to be in an off state, and acquires a current value flowing through at least one of the some branch paths, and determines whether or not it is in the conductive state based on the acquired current value. The in-vehicle power supply device according to [4].

[0020] The above in-vehicle power supply device can determine whether or not it is in the conductive state with a simple configuration.

[0021] (6) The individual cutoff condition is a condition that is satisfied when the current value flowing through the branch path exceeds a first threshold value. The batch cutoff condition is a condition that is satisfied when a value obtained by multiplying the current value flowing through one branch path by a predetermined multiplication value exceeds a second threshold value that is larger than the first threshold value. The in-vehicle power supply device according to any one of [2] to [5].

[0022] The above in-vehicle power supply device can determine whether or not the batch cutoff condition is satisfied based on the current value flowing through one branch path.

[0023] (7) At least one electronic component including the cutoff unit is provided between the upstream conductor and the downstream conductor. A load-side connection part for connecting a load is provided on the downstream conductor. The connection part is arranged closer to the load-side connection part between the at least one electronic component and the load-side connection part. The in-vehicle power supply device according to any one of [1] to [6].

[0024] The above in-vehicle power supply device can suppress the current that has merged through the conductive member from flowing into the electronic component provided between the upstream conductor and the downstream conductor.

[0025] 〔8〕The plurality of the downstream conductors includes two parallel downstream conductors arranged side by side in parallel with each other. The connection part is provided on one side surface in the orthogonal direction that is orthogonal to the direction in which the two parallel downstream conductors extend and is also orthogonal to the direction in which the two parallel downstream conductors are arranged, in each of the parallel downstream conductors. The connection parts provided on each of the parallel downstream conductors are arranged so as to approach each other in the direction in which the two parallel downstream conductors are arranged. 〔1〕The in-vehicle power supply device according to any one of 〔1〕to 〔7〕.

[0026] In the above in-vehicle power supply device, since the connection parts of each of the parallel downstream conductors are all provided on one side surface in the above orthogonal direction, it is easy to connect the conduction members. Moreover, since each of the connection parts is arranged so as to approach each other in the direction in which the two parallel downstream conductors are arranged, it is easy to shorten the length of the conduction members.

[0027] 〔9〕The cutoff parts provided in each of the branch paths are constituted by elements of the same model number as each other. 〔1〕The in-vehicle power supply device according to any one of 〔1〕to 〔8〕.

[0028] In the above in-vehicle power supply device, it is easy to ensure the uniformity of the cutoff performance of the cutoff parts in each of the branch paths.

[0029] 〔10〕A preparation step of preparing a device body including a common path to which power based on a power supply part is supplied, a plurality of branch paths branched from the common path, and cutoff parts provided in each of the branch paths is included. Each of the branch paths has an upstream conductor and a downstream conductor provided on a side opposite to the common path side with respect to the upstream conductor. Each of the cutoff parts is provided between the upstream conductor and the downstream conductor, and switches from an allowable state that allows the flow of current from the upstream conductor side to the downstream conductor side to a cutoff state that cuts off when a cutoff condition is satisfied. Furthermore, a selection step is included for selecting whether or not to connect the downstream conductors of the plurality of branch paths by a conducting member, applying the selection result of the selection step to the apparatus main body to configure a vehicle-mounted power supply device A method for manufacturing a vehicle-mounted power supply device.

[0030] In the selection step, when it is selected not to connect the plurality of downstream conductors by a conducting member, the plurality of branch paths can be configured as separate paths. Also, in the selection step, when it is selected to connect the plurality of downstream conductors by a conducting member, a path can be configured to merge the currents supplied from the common path to the plurality of branch paths by the downstream conductors. That is, according to this configuration, a power supply device that can be compatible with both a vehicle equipped with a plurality of first loads and a vehicle equipped with a second load having a rated current larger than that of the first load can be realized while suppressing an increase in size.

[0031] <First Embodiment> 1. Configuration of the vehicle-mounted power supply device 10 The vehicle-mounted power supply device 10 shown in FIG. 1 (hereinafter, also simply referred to as "power supply device 10") is attached to a vehicle (not shown). A power supply unit 90 is mounted on the vehicle. The power supply unit 90 is a DC power supply such as a battery, for example. The terminal on the negative electrode side of the battery is electrically connected to the ground.

[0032] The power supply device 10 is assumed to be attached to a plurality of types of vehicles having different rated currents of loads. The plurality of types of vehicles means vehicles in which at least one load has a different rated current due to differences such as vehicle type, grade, destination, and options.

[0033] The power supply device 10 is configured as, for example, a junction box, an electrical connection box, or the like. The power supply device 10 includes a housing 11, a common path 12, a first branch path 20, and a second branch path 40.

[0034] The common path 12 is formed of, for example, a bus bar and has a plate shape. At least a part of the common path 12 is disposed within the housing 11. The common path 12 is electrically connected to the power supply unit 90 (more specifically, the terminal on the positive electrode side of the battery). Electric power based on the power supply unit 90 is supplied to the common path 12.

[0035] The first branch path 20 is a path branched from the common path 12. The first branch path 20 is a path assumed to allow a current of 10 A to flow. A plurality (two in this embodiment) of the first branch paths 20 are provided. The plurality of first branch paths 20 are arranged in parallel with each other. Each first branch path 20 includes a first upstream conductor 21 and a first downstream conductor 22.

[0036] The first upstream conductor 21 is electrically connected to the common path 12 in a form short-circuited to the common path 12. The first upstream conductor 21 is formed of, for example, a bus bar and has a plate shape. One end side of the first upstream conductor 21 is fixed to the common path 12. The fixing method is not particularly limited and may be, for example, soldering, welding, or co-fastening with bolts.

[0037] The first downstream conductor 22 is provided on the side opposite to the common path 12 side (downstream side) with respect to the first upstream conductor 21. The first downstream conductor 22 is constituted by, for example, a bus bar and has a plate shape. The first downstream conductor 22 has a long form along the direction in which current flows. The first downstream conductor 22 is provided with a first load-side connection portion 23 for connecting the load 91. In the present embodiment, the first load-side connection portion 23 will be described as having a configuration in which a first insertion hole 24 for inserting a bolt (for example, a stud bolt) is formed, but another configuration may be used. For example, the first load-side connection portion 23 may have a configuration in which a mounting surface for surface-mounting a wiring portion on the load 91 side is formed. The first load-side connection portion 23 is electrically connected to the load 91 using a bolt. The bolt inserted into the first insertion hole 24 of the first load-side connection portion 23 functions as a part of the power supply path to the load 91. Among the plurality of first insertion holes 24, one first insertion hole 24 (more specifically, the first insertion hole 24A) has an inner diameter corresponding to 20 A or less, and the other first insertion holes 24 (more specifically, the first insertion hole 24B) have an inner diameter corresponding to 10 A or less. Therefore, the inner diameter of one first insertion hole 24 (more specifically, the first insertion hole 24A) is larger than the inner diameter of the other first insertion holes 24 (more specifically, the first insertion hole 24B).

[0038] The load 91 includes a first load 92 and a second load 93 having a rated current larger than that of the first load 92. The rated current of the first load 92 is, for example, 10 A, and the rated current of the second load 93 is, for example, 20 A. That is, the rated current of the second load 93 is an integer multiple (more specifically, twice) of the rated current of the first load 92. The first load 92 is, for example, a heater, a chiller, etc. for non-cold regions. The second load 93 is, for example, a heater for cold regions.

[0039] The power supply device 10 includes a plurality of first cutoff parts 25. The first cutoff parts 25 are provided in respective first branch paths 20. The first cutoff part 25 is provided between a first upstream conductor 21 and a first downstream conductor 22, and when a cutoff condition is satisfied, it switches from a first allowable state that allows the flow of current from the first upstream conductor 21 side to the first downstream conductor 22 side to a first cutoff state that cuts off the current flow. The first cutoff parts 25 provided in the respective first branch paths 20 are each composed of elements of the same model number. According to this configuration, the power supply device 10 can easily equalize the cutoff performance of the first cutoff parts 25 in the respective first branch paths 20. In the present embodiment, the first cutoff part 25 has a configuration including a switching element, more specifically, a configuration including a semiconductor switching element. The configuration including a semiconductor switching element may be a configuration including only a semiconductor switching element, or may be a configuration including a protection circuit or the like (for example, an IPD (Intelligent Power Device)). The semiconductor switching element may be, for example, a MOSFET (Metal - Oxide - Semiconductor Field Effect Transistor). The first cutoff part 25 is joined to the first upstream conductor 21 and the first downstream conductor 22. The first cutoff part 25 also functions as a switch part. The first cutoff part 25 becomes an allowable state when the semiconductor switching element is in an on state, and conducts the first upstream conductor 21 and the first downstream conductor 22. Further, the first cutoff part 25 becomes a cutoff state when the semiconductor switching element is in an off state, and makes the first upstream conductor 21 and the first downstream conductor 22 non - conductive. That is, the first cutoff part 25 switches between an allowable state and a cutoff state.

[0040] The plurality of first downstream conductors 22 are configured to be electrically connected to each other via a conductive member 80 (see FIG. 3). Each first downstream conductor 22 is provided with a connection portion 26 that is connected to the conductive member 80. The bus bar constituting the first downstream conductor 22 is composed of a conductive base material 30 and an insulating layer 31 that covers a part of the base material. The connection portion 26 is constituted by an exposed surface of the base material 30 that is not covered by the insulating layer 31. The connection portion 26 is disposed closer to the first load side connection portion 23 between the first cutoff portion 25 and the first load side connection portion 23. According to this configuration, the power supply device 10 can suppress the current that has merged via the conductive member 80 from flowing into the first cutoff portion 25 provided between the first upstream conductor 21 and the first downstream conductor 22.

[0041] The plurality of first downstream conductors 22 described above include two parallel downstream conductors 22A and 22B that are arranged parallel to each other. The two parallel downstream conductors 22A and 22B are arranged side by side in a direction orthogonal to the thickness direction. The connection portion 26 is provided on one side surface in the orthogonal direction (the thickness direction of the first downstream conductor 22) that is orthogonal to the direction in which the parallel downstream conductors 22A and 22B extend and the direction in which the parallel downstream conductors 22A and 22B are arranged. The connection portions 26 provided on each of the parallel downstream conductors 22A and 22B are arranged closer to each other in the direction in which the parallel downstream conductors 22A and 22B are arranged. That is, in the direction in which the parallel downstream conductors 22A and 22B are arranged, the connection portion 26 provided on one side parallel downstream conductor 22A is arranged closer to the other side, and the connection portion 26 provided on the other side parallel downstream conductor 22B is arranged closer to the one side. In this power supply device 10, since the connection portions 26 of the parallel downstream conductors 22A and 22B are all provided on one side surface in the above orthogonal direction, it is easy to connect the conductive member 80. Moreover, each connection portion 26 is arranged closer to each other in the direction in which the parallel downstream conductors 22A and 22B are arranged. Therefore, the power supply device 10 can easily shorten the length of the conductive member 80.

[0042] Furthermore, the connection portion 26 provided on the parallel downstream conductor 22A on one side is provided at the other end of the parallel downstream conductor 22A. The connection portion 26 provided on the parallel downstream conductor 22B on the other side is provided at one end of the parallel downstream conductor 22B. Therefore, the power supply device 10 is more likely to shorten the length of the conduction member 80.

[0043] The conduction member 80 has conductivity and, for example, has a rod shape. The conduction member 80 is connected to the connection portions 26 of the plurality of first downstream conductors 22 and is arranged across the plurality of first downstream conductors 22. The conduction member 80 electrically connects the plurality of first downstream conductors 22 to each other. The conduction member 80 shorts the first downstream conductors 22 to each other.

[0044] When the plurality of first branch paths 20 are not connected by the conduction member 80, the power supply device 10 configures the plurality of first branch paths 20 as separate paths. Further, when the plurality of first branch paths 20 are connected by the conduction member 80, the power supply device 10 configures a path for combining the currents supplied from the common path 12 to the plurality of first branch paths 20 at the first downstream conductors 22. That is, according to this configuration, it is possible to realize the power supply device 10 that can cope with both a vehicle equipped with a plurality of first loads 92 and a vehicle equipped with a second load 93 having a rated current larger than that of the first load 92 while suppressing an increase in size.

[0045] The power supply device 10 includes a plurality of first current detection units 32. The first current detection unit 32 is provided in each first branch path 20 and detects the current value flowing through the first branch path 20. The first current detection unit 32 is provided on the common path 12 side (more specifically, the first upstream conductor 21) rather than the connection portion 26 in the first branch path 20, and detects the current value flowing through the common path 12 side (more specifically, the first upstream conductor 21) rather than the connection portion 26 in the first branch path 20. The first current detection unit 32 outputs a signal capable of specifying the current value flowing through the first branch path 20. The first current detection unit 32 includes, for example, a known current sensor (a Hall element in the present embodiment).

[0046] The second branch path 40 is a path branched from the common path 12. The second branch path 40 has a second upstream conductor 41 and a second downstream conductor 42. The second branch path 40 is a path through which a current larger than that flowing through the first branch path 20 can flow. In the present embodiment, the second branch path 40 is a path assumed to have a current of 20 A flowing therethrough.

[0047] The second upstream conductor 41 is electrically connected to the common path 12 in a form short-circuited to the common path 12. The second upstream conductor 41 is constituted by, for example, a bus bar and has a plate shape. One end side of the second upstream conductor 41 is fixed to the common path 12. The fixing method is not particularly limited, and may be, for example, soldering, welding, or clamping with bolts. The first upstream conductor 21 described above has a smaller cross section (a cross section cut in a direction orthogonal to the direction in which the current flows) than the second upstream conductor 41.

[0048] The second downstream conductor 42 is provided on the side opposite to the common path 12 side (downstream side) with respect to the second upstream conductor 41. The second downstream conductor 42 is constituted by, for example, a bus bar and has a plate shape. The second downstream conductor 42 has a long shape along the direction in which the current flows. A second load-side connection portion 43 for connecting a load 91 (more specifically, a second load 93) is provided on the second downstream conductor 42. In the present embodiment, the second load-side connection portion 43 will be described as having a configuration in which a second insertion hole 44 for inserting a bolt (for example, a stud bolt) is formed, but another configuration may be used. For example, the second load-side connection portion 43 may have a configuration in which a mounting surface for surface-mounting a wiring portion on the load 91 side is formed. The second load-side connection portion 43 is electrically connected to the load 91 using a bolt. The bolt inserted into the second insertion hole 44 of the second load-side connection portion 43 functions as a part of the power supply path to the load 91. The second insertion hole 44 has an inner diameter corresponding to 20 A or less. That is, the inner diameter of the second insertion hole 44 is the same as the inner diameter of the first insertion hole 24A. Note that the same inner diameter is not limited to exactly the same inner diameter, but also includes substantially the same inner diameter. Substantially the same inner diameter means that the ratio of the difference between the inner diameter of the second insertion hole 44 and the inner diameter of the first insertion hole 24A to the larger inner diameter is within 5%.

[0049] The power supply device 10 includes a second interrupting section 45. The second interrupting section 45 is provided in the second branch path 40. The second interrupting section 45 is provided between the second upstream conductor 41 and the second downstream conductor 42, and when the second interruption condition is satisfied, it switches from the second allowable state that allows the current to flow from the second upstream conductor 41 side to the second downstream conductor 42 side to the second interrupting state where the current flow is interrupted. In the present embodiment, the second interrupting section 45 has a configuration including a switching element, more specifically, a configuration including a semiconductor switching element. The configuration including a semiconductor switching element may be a configuration including only a semiconductor switching element, or may be a configuration including a protection circuit or the like (for example, an IPD (Intelligent Power Device)). The semiconductor switching element may be, for example, a MOSFET (Metal - Oxide - Semiconductor Field Effect Transistor). The second interrupting section 45 is joined to the second upstream conductor 41 and the second downstream conductor 42. The second interrupting section 45 also functions as a second switch section. When the semiconductor switching element is in the on state, the second interrupting section 45 becomes the second allowable state and conducts the second upstream conductor 41 and the second downstream conductor 42. Further, when the semiconductor switching element is in the off state, the second interrupting section 45 becomes the second interrupting state and makes the second upstream conductor 41 and the second downstream conductor 42 non - conductive. That is, the second interrupting section 45 switches between the second allowable state and the second interrupting state.

[0050] The power supply device 10 includes a second current detection section 52. The second current detection section 52 is provided in the second branch path 40 and detects the current value flowing through the second branch path 40. The second current detection section 52 outputs a signal capable of specifying the current value flowing through the second branch path 40. The second current detection section 52 is configured to include, for example, a known current sensor (in the present embodiment, a Hall element).

[0051] The power supply device 10 includes a control unit 50 that controls the first cutoff unit 25 and the second cutoff unit 45. The control unit 50 is configured to include, for example, an MCU (Micro Controller Unit), a drive circuit for a switching element, and the like. The control unit 50 receives the signals output from the respective first current detection units 32 and acquires the current values flowing through the respective first branch paths 20. The control unit 50 receives the signal output from the second current detection unit 52 and acquires the current value flowing through the second branch path 40.

[0052] The control unit 50 can selectively execute the first control and the second control. The first control is a control assuming a configuration in which the plurality of first downstream conductors 22 are not electrically connected to each other by the conducting member 80. The first control determines, for each of the first branch paths 20, whether or not an individual cutoff condition, which is one of the first cutoff conditions, is satisfied based on the current value flowing through each of the first branch paths 20, and switches the first cutoff unit 25 provided in the first branch path 20 for which it is determined that the individual cutoff condition is satisfied to the first cutoff state.

[0053] The second control is a control assuming a configuration in which the plurality of first downstream conductors 22 are electrically connected to each other by the conducting member 80. The second control determines whether or not a batch cutoff condition, which is one of the first cutoff conditions, is satisfied based on the current value flowing through at least one of the first branch paths 20, and when it is determined that the batch cutoff condition is satisfied, switches each of the first cutoff units 25 provided in the plurality of first branch paths 20 to the first cutoff state. According to this configuration, the power supply device 10 can selectively execute control corresponding to each of the configuration in which the plurality of first downstream conductors 22 are electrically connected to each other by the conducting member 80 and the configuration in which they are not electrically connected.

[0054] When a signal instructing which of the first control and the second control the control unit 50 is to execute is given from the outside, the control unit 50 executes the control indicated by the signal. According to this configuration, by giving a signal from the outside to the control unit 50, it is possible to instruct the control unit 50 to execute the control to be executed by the control unit 50. The instruction from the outside is basically performed before the power supply device 10 is mounted on the vehicle.

[0055] The control unit 50 determines whether or not a second cutoff condition is satisfied based on the current value flowing through the second branch path 40, and switches the second cutoff unit 45 provided in the second branch path 40, for which it is determined that the second cutoff condition is satisfied, to the second cutoff state.

[0056] The individual cutoff condition is a condition that is satisfied when the current value flowing through the first branch path 20 exceeds the first threshold value. The individual cutoff condition may be a condition that is immediately satisfied when the current value flowing through the first branch path 20 exceeds the first threshold value, or may be a condition that is satisfied when the state in which the current value flowing through the first branch path 20 exceeds the first threshold value continues for a first predetermined time. The first predetermined time may vary depending on the degree to which the current value flowing through the first branch path 20 exceeds the first threshold value. For example, the first predetermined time may become shorter as the degree to which the current value flowing through the first branch path 20 exceeds the first threshold value increases. The individual cutoff condition may be a condition that is satisfied based on first correspondence data indicating the correspondence relationship between a plurality of current values and the first predetermined time corresponding to each current value, and the current value flowing through the first branch path 20. The control unit 50 starts determining whether or not the first predetermined time corresponding to each current value has elapsed each time the current value shown in the first correspondence data is exceeded, and may switch the first cutoff unit 25 to the first cutoff state when it is determined that any of the first predetermined times has elapsed. The first correspondence data may be function data or table data.

[0057] The batch cut-off condition is a condition that is satisfied when a value obtained by multiplying the current value flowing through one first branch path 20 by a predetermined multiplication value (2 in this embodiment) exceeds a second threshold value that is larger than the first threshold value. According to this configuration, the power supply device 10 can determine whether or not the batch cut-off condition is satisfied based on the current value flowing through one first branch path 20. The multiplication value is a value greater than 1. The multiplication value is the number of first branch paths 20, and more specifically, the number of first branch paths 20 that can be electrically connected via the conductive member 80. The batch cut-off condition may be a condition that is immediately satisfied when a value obtained by multiplying the current value flowing through one first branch path 20 by a predetermined multiplication value exceeds the second threshold value, or may be a condition that is satisfied when the state of exceeding the second threshold value continues for a second predetermined time. The second predetermined time may vary depending on the degree to which a value obtained by multiplying the current value flowing through one first branch path 20 by a predetermined multiplication value exceeds the second threshold value. For example, the second predetermined time may become shorter as the degree to which a value obtained by multiplying the current value flowing through one first branch path 20 by a predetermined multiplication value exceeds the second threshold value increases. Batch cut-off condition It may be a condition that is satisfied based on second correspondence data indicating the correspondence relationship between a plurality of current values and the second predetermined time corresponding to each current value, and a value obtained by multiplying the current value flowing through one first branch path 20 by a predetermined multiplication value. The control unit 50 may start determining whether or not the second predetermined time corresponding to each current value has elapsed each time the current value shown in the second correspondence data is exceeded, and may switch each first cutoff unit 25 to the first cutoff state when it is determined that any of the second predetermined times has elapsed. The 2 The correspondence data may be function data or table data.

[0058] The second cutoff condition is a condition that holds when the current value flowing through the second branch path 40 exceeds a second threshold value. The second cutoff condition may be a condition that holds immediately when the current value flowing through the second branch path 40 exceeds the second threshold value, or may be a condition that holds when the state where the current value flowing through the second branch path 40 exceeds the second threshold value continues for a second predetermined time. The second predetermined time may vary depending on the degree to which the current value flowing through the second branch path 40 exceeds the second threshold value. For example, the second predetermined time may become shorter as the degree to which the current value flowing through the second branch path 40 exceeds the second threshold value increases. The second cutoff condition may be a condition that holds based on the second corresponding data described above and the current value flowing through the second branch path 40. The control unit 50 starts determining whether or not the second predetermined time corresponding to each current value has elapsed each time the current value shown in the second corresponding data is exceeded, and may switch the second cutoff unit 45 to the second cutoff state when it is determined that any of the second predetermined times has elapsed.

[0059] According to this configuration, the power supply device 10 can share the second threshold value between the batch cutoff condition and the second cutoff condition. Further, the power supply device 10 can also share the second corresponding data between the batch cutoff condition and the second cutoff condition.

[0060] 2. Operation of the power supply device 10 The control unit 50 of the power supply device 10 performs the control instructed from the outside of the power supply device 10 among the first control and the second control.

[0061] When the first control is instructed, the control unit 50 operates as follows. It is assumed that the power supply device 10 has a configuration in which a first load 92 is connected to each first branch path 20 and no load is connected to the second branch path 40, as shown in FIG. 2. When the start condition is satisfied, the control unit 50 starts monitoring the current value flowing through each first branch path 20. The start condition is, for example, that the vehicle start switch (such as an ignition switch or a power switch) has been switched from the off state to the on state. In this case, when the allowable condition is satisfied for any one of the first branch paths 20, the control unit 50 switches the first cutoff unit 25 provided in the first branch path 20 for which the allowable condition is satisfied to the first allowable state and supplies power to the first load 92. The allowable condition is, for example, that an allowable operation has been performed by the user. Note that the second cutoff unit 45 is maintained in the second cutoff state. The control unit 50 determines whether the individual cutoff condition is satisfied for each of the first branch paths 20 based on the current value flowing through each first branch path 20. When the control unit 50 determines that the individual cutoff condition is not satisfied for any of the first branch paths 20, it repeats the determination of whether the individual cutoff condition is satisfied for each of the first branch paths 20 based on the current value flowing through each first branch path 20. When the control unit 50 determines that the individual cutoff condition is satisfied, it switches the first cutoff unit 25 provided in the first branch path 20 for which the individual cutoff condition is satisfied to the first cutoff state.

[0062] When the second control is instructed, the control unit 50 operates as follows. Note that, as shown in FIG. 3, it is assumed that the power supply device 10 has a configuration in which a second load 93 is connected to one first branch path 20, and no load 91 is connected to the other first branch path 20 and the second branch path 40. When the above-described start condition is satisfied, the control unit 50 starts monitoring the current value flowing through one of the first branch paths 20. When the allowable condition is satisfied for the first branch path 20, the first cutoff unit 25 provided in each first branch path 20 is switched to the first allowable state, and power is supplied to the second load 93. Note that the second cutoff unit 45 is maintained in the second cutoff state. The control unit 50 determines whether or not a batch cutoff condition is satisfied based on the current value flowing through one of the first branch paths 20. When it is determined that the batch cutoff condition is not satisfied, the control unit 50 repeatedly determines whether or not the batch cutoff condition is satisfied based on the current value flowing through one of the first branch paths 20. When it is determined that the batch cutoff condition is satisfied, the first cutoff unit 25 provided in each first branch path 20 is switched to the first cutoff state.

[0063] Note that, in the configuration in which the second load 93 is connected to the second branch path 40, the control unit 50 further starts monitoring the current value flowing through the second branch path 40. Then, the control unit 50 determines whether or not a second cutoff condition is satisfied based on the current value flowing through the second branch path 40. When it is determined that the second cutoff condition is not satisfied, the control unit 50 repeatedly determines whether or not the second cutoff condition is satisfied based on the current value flowing through the second branch path 40. When it is determined that the second cutoff condition is satisfied, the second cutoff unit 45 provided in the second branch path 40 is switched to the second cutoff state.

[0064] 3. Manufacturing Method of Power Supply Device 10 The manufacturing method of the power supply device 10 includes a preparation step and a selection step.

[0065] In the preparation process, the apparatus main body 10A is prepared. The apparatus main body 10A includes a common path 12 to which power based on the power supply unit 90 is supplied, a plurality of first branch paths 20 branched from the common path 12, and first cutoff portions 25 provided in each of the first branch paths 20. Each of the first branch paths 20 has a first upstream conductor 21 and a first downstream conductor 22 provided on the side opposite to the common path 12 side with respect to the first upstream conductor 21. Each of the first cutoff portions 25 is provided between the first upstream conductor 21 and the first downstream conductor 22, and switches from a first allowable state that allows the flow of current from the first upstream conductor 21 side to the first downstream conductor 22 side to a first cutoff state that cuts off the flow of current when the first cutoff condition is satisfied.

[0066] In the selection process, it is selected whether or not to connect the first downstream conductors 22 of the plurality of first branch paths 20 by the conduction member 80. Then, the power supply apparatus 10 is configured by applying the selection result of the selection process to the apparatus main body 10A.

[0067] In the selection process, when it is selected not to connect the plurality of first downstream conductors 22 by the conduction member 80, the plurality of first branch paths 20 can be configured as separate paths. Further, in the selection process, when it is selected to connect the plurality of first downstream conductors 22 by the conduction member 80, a path can be configured to merge the current supplied from the common path 12 to the plurality of first branch paths 20 by the first downstream conductors 22. That is, according to this configuration, the power supply apparatus 10 that can be compatible with both a vehicle equipped with a plurality of first loads 92 and a vehicle equipped with a second load 93 having a rated current larger than that of the first load 92 can be realized while suppressing an increase in size.

[0068] <Second Embodiment> The in-vehicle power supply apparatus 10 of the first embodiment was configured to select and execute either the first control or the second control in response to an instruction from the outside. On the other hand, in the second embodiment, a configuration in which the in-vehicle power supply apparatus 210 itself determines which control to execute will be described. In the description of the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

[0069] The in-vehicle power supply device 210 of the second embodiment (hereinafter, also simply referred to as "power supply device 210") is different from the power supply device 10 of the first embodiment mainly in that it includes a control unit 250. The device main body 210A shown in FIG. 4 is different from the device main body 10A of the first embodiment mainly in that it includes a control unit 250. The control unit 250 is different from the control unit 50 of the first embodiment mainly in that it includes a determination unit 251.

[0070] The determination unit 251 determines whether or not a plurality of first downstream conductors 22 are in a conductive state electrically connected by a conductive member 80 (see FIG. 3). More specifically, when a determination start condition is satisfied, the determination unit 251 controls a first cutoff unit 25 provided in a part of the plurality of first branch paths 20 to a first allowable state, and controls a first cutoff unit 25 provided in the other first branch paths 20 to a first cutoff state (that is, in a state where a switch unit provided in a part of the first branch paths 20 is controlled to an on state and a switch unit provided in the other first branch paths 20 is controlled to an off state), obtains a current value flowing through at least one of the part of the first branch paths 20, and determines whether or not it is in a conductive state based on the obtained current value.

[0071] In the present embodiment, when a determination start condition is satisfied, the first cutoff unit 25 provided in one of the two first branch paths 20 is controlled to a first allowable state, and the first cutoff unit 25 provided in the other first branch path 20 is controlled to a first cutoff state (that is, in a state where a switch unit provided in one of the first branch paths 20 is controlled to an on state and a switch unit provided in the other first branch path 20 is controlled to an off state), obtains a current value flowing through the one first branch path 20, and determines whether or not it is in a conductive state based on the obtained current value. With this configuration, the power supply device 210 can determine whether or not it is in a conductive state with a simple configuration.

[0072] The determination unit 251 determines, for example, whether the acquired current value exceeds a determination threshold value (for example, 15 A). If it is determined that the determination threshold value is not exceeded, it is determined that the conduction state is not present. If it is determined that the determination threshold value is exceeded, it is determined that the conduction state is present.

[0073] Note that the determination start condition may be, for example, that the control unit 250 is first activated after the power supply device 210 is mounted on the vehicle, or that the start switch of the vehicle is switched to the on state.

[0074] When it is determined by the determination unit 251 that the conduction state is not present, the control unit 250 selects and executes the first control. When it is determined by the determination unit 251 that the conduction state is present, the control unit 250 selects and executes the second control.

[0075] According to this configuration, the power supply device 210 can automatically select and execute appropriate control according to whether the conduction state is present or not.

[0076] <Third Embodiment> In the first embodiment, the configuration is such that each first cutoff unit 25 is individually controlled in the second control. In contrast, in the third embodiment, a configuration in which each first cutoff unit 25 is collectively controlled in the second control will be described. In the description of the third embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

[0077] As shown in FIG. 5, the in-vehicle power supply device 310 (hereinafter, also simply referred to as "power supply device 310") according to the third embodiment includes a first signal line 360, a switching switch unit 361, a second signal line 362, and a control unit 350.

[0078] The first signal line 360 is provided corresponding to each first cutoff unit 25. Each first signal line 360 supplies a control signal (for example, an on / off signal) output from the control unit 350 to the first cutoff unit 25 corresponding to itself.

[0079] The switching switch section 361 is provided between each of the first signal lines 360, conducts the first signal lines 360 to each other when in the on state, and non-conducts the first signal lines 360 to each other when in the off state. The switching switch section 361 has a configuration including a switching element, more specifically, a configuration including a semiconductor switching element. The configuration including a semiconductor switching element may be a configuration including only a semiconductor switching element, or may be a configuration including a protection circuit or the like (for example, an IPD (Intelligent Power Device)). The semiconductor switching element may be, for example, a MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor).

[0080] The second signal line 362 supplies a control signal (for example, an on / off signal) output from the control section 350 to the switching switch section 361.

[0081] The control section 350 is different from the control section 50 of the first embodiment mainly in that it controls the switching switch section 361. The control section 350 supplies a control signal to the first cutoff section 25 via each of the first signal lines 360. The control section 350 can control the switching switch section 361 by supplying a control signal to the switching switch section 361 via the second signal line 362.

[0082] In the first control described in the first embodiment, the control section 350 controls the switching switch section 361 to the off state. When the switching switch section 361 is in the off state, the control section 350 can individually control each of the first cutoff sections 25 (switch sections) via each of the first signal lines 360. Also, in the second control described in the first embodiment, the control section 350 controls the switching switch section 361 to the on state. When the switching switch section 361 is in the on state, the control section 350 can collectively control a plurality of the first cutoff sections 25 (switch sections) via any one of the first signal lines 360. That is, the control section 350 can collectively supply a control signal to a plurality of the first cutoff sections 25 (switch sections) by outputting a control signal to any one of the plurality of first signal lines 360, and can collectively control the plurality of first cutoff sections 25 (switch sections).

[0083] <Other embodiments> The present disclosure is not limited to the embodiments described by the above description and drawings. For example, the features of the above-described or below-described embodiments can be combined in any combination within a non-contradictory range. Also, any feature of the above-described or below-described embodiments can be omitted if it is not explicitly specified as essential. Furthermore, the above-described embodiments may be modified as follows.

[0084] In each of the above embodiments, the power supply device 10 has a configuration including the second branch path 40, but it may have a configuration not including the second branch path 40.

[0085] In each of the above embodiments, the first cutoff unit 25 functions as a switch unit, but it may have a configuration that cannot return to the first allowable state after switching to the first cutoff state. For example, the first cutoff unit 25 may be a mechanical fuse that melts when the temperature exceeds a threshold temperature, or may be a pyrotechnic cutoff device (e.g., a pyro fuse) that physically cuts off the first branch path 20 when a cutoff signal is input. The same applies to the second cutoff unit 45.

[0086] In each of the above embodiments, the switch unit is constituted by the first cutoff unit 25, but it may have a configuration provided separately from the first cutoff unit 25. In this case, for example, the first cutoff unit 25 and the switch unit may be provided in series between the first upstream conductor 21 and the first downstream conductor 22. In each of the above embodiments, the second switch unit is constituted by the second cutoff unit 45, but it may have a configuration provided separately from the second cutoff unit 45. In this case, for example, the second cutoff unit 45 and the second switch unit may be provided in series between the second upstream conductor 41 and the second downstream conductor 42.

[0087] In each of the above embodiments, two first branch paths 20 can be electrically connected to each other by the conductive member 80, but it may have a configuration in which three or more first branch paths 20 can be electrically connected to each other by the conductive member 80.

[0088] The determination unit 251 is not limited to the configuration of the second embodiment. For example, the determination unit 251 may be a determination circuit configured separately from the control unit 50.

[0089] It should be considered that all the embodiments disclosed this time are illustrative in all respects and not restrictive. The scope of the present invention is not limited to the embodiments disclosed this time, but is intended to include all modifications within the scope indicated by the claims or within the scope equivalent to the claims.

Explanation of reference numerals

[0090] 10... Power supply device 10A... Device main body 11... Housing 12... Common path 20... First branch path (branch path) 21... First upstream conductor (upstream conductor) 22... First downstream conductor (downstream conductor) 22A... Parallel downstream conductor 22B... Parallel downstream conductor 23... First load side connection portion (load side connection portion) 24... First insertion hole 24A... First insertion hole (insertion hole) 24B... First insertion hole 25... First cutoff portion (cutoff portion) 26... Connection portion 30... Base material 31... Insulation layer 32... First current detection unit 40... Second branch path 41... Second upstream conductor 42... Second downstream conductor 43... Second load side connection portion 44... Second insertion hole 45... Second cutoff portion 50... Control unit 52... Second current detection unit 80... Conductive member 90... Power supply unit 91... Load 92... First load (load) 93…Second load 210…Power supply device 210A…Device main body 250…Control unit 251…Judgment unit 310…Power supply device 350…Control unit 360…First signal line 361…Switching switch unit 362…Second signal line

Claims

1. A common path to which power based on a power supply unit is supplied, a plurality of branch paths branched from the common path, and a cutoff unit provided in each of the branch paths, each of the branch paths having an upstream conductor and a downstream conductor provided on a side opposite to the common path side with respect to the upstream conductor, each of the cutoff units being provided between the upstream conductor and the downstream conductor and switching from a permitted state that permits the flow of current from the upstream conductor side to the downstream conductor side to a cutoff state that cuts off the flow of current when a cutoff condition is satisfied, the plurality of downstream conductors being configured to be conductible with each other via a conducting member, and each of the downstream conductors being provided with a connection portion connected to the conducting member A vehicle-mounted power supply device.

2. Comprising a control unit that controls the cutoff unit, the control unit being capable of selectively executing first control and second control, the first control determining whether an individual cutoff condition, which is one of the cutoff conditions, is satisfied for each of the branch paths based on the current value flowing through each of the branch paths, and switching the cutoff unit provided in the branch path for which it is determined that the individual cutoff condition is satisfied to the cutoff state, the second control determining whether a batch cutoff condition, which is one of the cutoff conditions, is satisfied based on the current value flowing through at least one of the branch paths, and switching each of the cutoff units provided in the plurality of branch paths to the cutoff state when it is determined that the batch cutoff condition is satisfied The vehicle-mounted power supply device according to Claim 1.

3. When a signal instructing which of the first control and the second control the control unit is to execute is given from the outside, the control unit executes the control instructed by the signal The vehicle-mounted power supply device according to Claim 2.

4. Comprising a determination unit that determines whether the plurality of downstream conductors are in a conducting state conducted by the conducting member, the control unit executing the first control when the determination unit determines that the conducting state is not present, and executing the second control when the determination unit determines that the conducting state is present The vehicle-mounted power supply device according to Claim 2.

5. In each of the branch paths, comprising a switch unit provided between the upstream conductor and the downstream conductor, When the determination start condition is satisfied, the determination unit controls the switch units provided in some of the plurality of branch paths to be in an on state, and controls the switch units provided in the other branch paths to be in an off state, and acquires a current value flowing through at least one of the some branch paths, and determines whether or not it is in the conduction state based on the acquired current value. The in-vehicle power supply device according to claim 4.

6. The individual cutoff condition is a condition that is satisfied when the current value flowing through the branch path exceeds a first threshold value. The batch cutoff condition is a condition that is satisfied when a value obtained by multiplying the current value flowing through one branch path by a predetermined multiplication value exceeds a second threshold value that is larger than the first threshold value. The in-vehicle power supply device according to any one of claims 2 to 5.

7. At least one electronic component including the cutoff unit is provided between the upstream conductor and the downstream conductor. A load side connection portion for connecting a load is provided on the downstream conductor. The connection portion is arranged closer to the load side connection portion between the at least one electronic component and the load side connection portion. The in-vehicle power supply device according to any one of claims 1 to 4.

8. The plurality of downstream conductors include two parallel downstream conductors arranged side by side in parallel with each other. The connection portion is provided on one side surface in a direction orthogonal to the direction in which the two parallel downstream conductors extend and also orthogonal to the direction in which the two parallel downstream conductors are arranged in each of the parallel downstream conductors. The connection portions provided on each of the parallel downstream conductors are arranged closer to each other in the direction in which the two parallel downstream conductors are arranged. The in-vehicle power supply device according to any one of claims 1 to 4.

9. The cutoff units provided in each of the branch paths are constituted by elements having the same model number as each other. The in-vehicle power supply device according to any one of claims 1 to 4.

10. A preparation step of preparing a device main body including a common path to which power based on a power supply unit is supplied, a plurality of branch paths branched from the common path, and a cutoff unit provided in each of the branch paths. Each of the branch paths has an upstream conductor and a downstream conductor provided on a side opposite to the common path side with respect to the upstream conductor. Each of the blocking portions is provided between the upstream conductor and the downstream conductor, and when a blocking condition is satisfied, it switches from a permitted state that permits the flow of current from the upstream conductor side to the downstream conductor side to a blocking state that blocks the flow of current. Furthermore, it includes a selection step of selecting whether to connect the downstream conductors of the plurality of branch paths by a conductive member. The apparatus main body applies the selection result of the selection step to configure a vehicle-mounted power supply device. A manufacturing method of a vehicle-mounted power supply device.

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