Power supply

Abstract

To provide a power supply device which can easily change a load whose power supply is made redundant.SOLUTION: A power converter 130 is connected between a first power supply terminal 110 for connecting a first power supply, and a second power supply terminal 120 for connecting a second power supply. A cut-off circuit 140 is connected between the first power supply terminal 110 and the power converter 130. A first switch 150 and a second switch 160 are connected between a first connection point CP1 between the power converter 130 and the cut-off circuit 140 and a second connection point CP2 between the power converter 130 and the second power supply terminal 120. A plurality of load terminals 170 for connecting to the load and a plurality of load switches 180 corresponding to the plurality of load terminals 170 by one to one are provided. Each of the plurality of load terminals 170 is connected to a line connecting the first switch 150 and the second switch 160 via the corresponding load switch 180.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a power supply device. [Background technology]

[0002] While a vehicle is in use, it is necessary to maintain the supply of power to loads related to functions such as driving, steering, stopping, opening and closing doors, etc. For this reason, technology has been developed to achieve power supply redundancy by providing a sub-battery in addition to the main battery (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-29093 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in conventional techniques such as the technique disclosed in Patent Document 1, circuits with redundant power supplies and circuits without redundant power supplies are designed separately during circuit design. Therefore, when attempting to provide redundant power to a load that does not have redundant power supplies, it was necessary to redesign the circuit.

[0005] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a power supply device that allows easy change of the load for which power supply redundancy is provided. [Means for solving the problem]

[0006] In order to solve the above problem, a power supply device according to one embodiment of the present invention has a first power supply terminal for connecting a first power supply, a second power supply terminal for connecting a second power supply, a power converter connected between the first power supply terminal and the second power supply terminal, a shutoff circuit connected between the first power supply terminal and the power converter, a first connection point between the power converter and the shutoff circuit and a second connection point between the power converter and the second power supply terminal, a plurality of load terminals for connecting to loads, and a plurality of load switches in one-to-one correspondence with the plurality of load terminals, and each of the plurality of load terminals is connected to a line connecting the first switch and the second switch via a corresponding load switch.

[0007] A control method according to one embodiment of the present invention is a control method executed by a computer for controlling the shutdown circuit, the first switch, the second switch, and the load switch of the power supply device, wherein when an abnormality occurs in the power supply connected to the first power supply terminal, the control method turns off the shutdown circuit and the first switch element, turns on the second switch element, turns on a load switch corresponding to a load terminal among the plurality of load terminals to which a first load that is a load requiring power redundancy is connected, and turns off a load switch corresponding to a load terminal among the plurality of load terminals to which a second load that is a load that does not require power redundancy is connected.

[0008] A control program according to an embodiment of the present invention causes a computer to execute the control method.

[0009] A storage medium according to one embodiment of the present invention is a computer-readable storage medium that stores the control program. Effect of the Invention

[0010] According to the present invention, it is possible to provide a power supply device that allows easy change of the load for which power supply redundancy is provided. [Brief description of the drawings]

[0011] [Figure 1] 1 is a diagram showing a power supply device 100 according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a diagram illustrating a flow of power in a normal state. [Diagram 3] 1 is a diagram for explaining the flow of power when the first power supply connected to the first power supply terminal 110 is not normal. FIG. [Figure 4] FIG. 11 is a diagram showing an example of a processing operation in a control unit 190. [Diagram 5] 1 is a diagram showing a power supply device 100 according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] <Power supply device 100> 1 is a diagram showing a power supply device 100 according to one embodiment of the present invention. The power supply device 100 has a first power supply terminal 110, a second power supply terminal 120, a power converter 130, an interrupter circuit 140, a first switch 150, a second switch 160, a plurality of load terminals 170, a plurality of load switches 180, and a control unit 190.

[0013] The first power supply terminal 110 is a terminal for connecting a first power supply. The first power supply is, for example, a main battery MB as shown in Fig. 1. The first power supply terminal 110 may be connected to an alternator ALT as shown in Fig. 1.

[0014] The second power supply terminal 120 is a terminal for connecting a second power supply. The second power supply is, for example, a sub-battery SB as shown in FIG.

[0015] The power converter 130 is a DC / DC converter that converts input power and outputs the converted power. The power converter 130 is connected between the first power supply terminal 120 and the second power supply terminal 130. When the main battery MB is connected to the first power supply terminal 110 as a first power supply and the sub-battery SB is connected to the second power supply terminal 120 as a second power supply, the power converter 130 supplies, for example, the power output from the main battery MB to the sub-battery SB.

[0016] Interruption circuit 140 has two terminals and switches between a connected state in which the two terminals are connected and an interrupted state in which the two terminals are interrupted. Interruption circuit 140 is connected between first power supply terminal 110 and power converter 130. Interruption circuit 140 may be configured, for example, by two switching elements (for example, MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors)) connected back to back.

[0017] The first switch 150 and the second switch 160 are connected between a first connection point CP1 between the power converter 130 and the interrupter circuit 140 and a second connection point CP2 between the power converter 130 and the second power supply terminal 120. As shown in Fig. 1, the first switch 150 is connected to the first connection point CP1 side, and the second switch 150 is connected to the second connection point CP2 side.

[0018] Each of the multiple load terminals 170 is a terminal for connecting a load, and corresponds one-to-one to the multiple load switches 180. As shown in FIG. 1, each of the multiple load terminals 170 is connected to a line connecting the first switch 150 and the second switch 160 via the corresponding load switch 180. The loads connected to the load terminals 170 include a first load L1 that requires power redundancy (e.g., a load related to the functions of running, steering, stopping, and door opening and closing) and a second load L2 that does not require power redundancy. In the example shown in FIG. 1, the power supply device 100 has two load terminals 170, and the first load L1 is connected to one load terminal 170, and the second load L2 is connected to the other load terminal 170. Each of the multiple load switches 180 is, for example, an intelligent power device (IPD).

[0019] Therefore, in this embodiment, the first switch 150 is connected between the first connection point CP1 and the multiple load switches 180. That is, in this embodiment, the interrupter circuit 140, the first switch 150, and the load switch 180 are connected between the first power supply terminal 110 and the multiple load terminals 170. Therefore, in this embodiment, when the interrupter circuit 140 is in a connected state, the first switch 150 is on, and the load switch 180 is on, the first power supply terminal 110 and the load terminal 170 are electrically connected, and as shown in FIG. 2, power is supplied from the first power supply (for example, the main battery MB) connected to the first power supply terminal 110 to the load (first load L1 in the example shown in FIG. 3) connected to the load terminal 170 via the interrupter circuit 140, the first switch 150, and the load switch 180.

[0020] In addition, in this embodiment, the second switch 160 is connected between the second connection point CP2 and the multiple load switches 180. That is, in this embodiment, the second switch 160 and the load switch 180 are connected between the second power supply terminal 120 and the multiple load terminals 170. Therefore, when the second switch 160 is on and the load switch 180 is on, the second power supply terminal 120 and the load terminal 170 are electrically connected, and as shown in FIG. 3, power is supplied from a power supply (e.g., a sub-battery SB) connected to the second power supply terminal 120 to a load (the second load L2 in the example shown in FIG. 3) connected to the load terminal 170 via the second switch 160 and the load switch 180.

[0021] The control unit 190 controls the interruption circuit 140, the first switch 150, the second switch 160, and the multiple load switches 180. The control unit 190 is configured by, for example, a computer. The control unit 190 controls the interruption circuit 140, the first switch 150, the second switch 160, and the multiple load switches 180 based on whether the power source (e.g., main battery MB) connected to the first power source terminal 120 is normal or not. The control unit 190 measures, for example, the voltage value of the power input to the first power source terminal 120, and when the measured voltage value is equal to or greater than a predetermined value, determines that the power source (e.g., main battery MB) connected to the first power source terminal 120 is normal.

[0022] <Normal control> In normal operation, that is, when the first power supply (e.g., main battery MB) connected to the first power supply terminal 110 is normal, the control unit 190 connects the interrupter circuit 140, turns on the first switch 150 and the multiple load switches 180, and turns off the second switch 160, as shown in Fig. 2. Therefore, in this embodiment, when the power supply connected to the first power supply terminal 120 is normal, it is possible to supply power to the load L connected to the load terminal 170 from the power supply connected to the first power supply terminal 120, as shown in Fig. 2.

[0023] <Control when main battery MB is not normal> When the first power supply (for example, the main battery MB) connected to the first power supply terminal 110 is not normal, the control unit 190, as shown in FIG. 3, sets the interruption circuit 140 to an interruption state, turns off the first switch 150, and turns on the second switch 160. At this time, the control unit 190, as shown in FIG. 3, turns on the load switch 180 corresponding to the load terminal 170 to which the first load L1 (load requiring power redundancy) is connected, and turns off the load switch 180 corresponding to the load terminal 170 to which the second load L2 (load not requiring power redundancy) is connected. At this time, the control unit 190 may store information regarding whether the first load L1 or the second load L2 is connected to each of the multiple load terminals 170, and control the load switch 180 based on this information.

[0024] Therefore, in this embodiment, when the power supply connected to the first power supply terminal 120 is not normal, as shown in FIG. 3, it is possible to supply power to a load (first load L1) that requires power redundancy from a power supply (e.g., a sub-battery SB) connected to the second power supply terminal 120.

[0025] Furthermore, in this embodiment, when changing a load that does not require power redundancy (second load L2) to a load that does require power redundancy (first load L1), it is only necessary to change the software of the control unit 190, and there is no need to change the circuit design. Therefore, in this embodiment, it is possible to provide a power supply device that allows easy change of the load to be made redundant.

[0026] 4 is a diagram showing an example of a processing operation in the control unit 190. While the first power source (for example, the main battery MB) connected to the first power source terminal 110 is normal (step S401, YES), the control unit 190 sets the interruption circuit 140 in a connected state, sets the first switch 150 and the multiple load switches 180 on, and sets the second switch 160 off (step S402). When the first power source (for example, the main battery MB) connected to the first power source terminal 110 becomes abnormal (step S402, NO), the control unit 190 sets the interruption circuit 140 in a disconnected state, sets the first switch 150 off, sets the second switch 160 on, sets the load switch 180 corresponding to the load terminal 170 to which the first load L1 (load requiring power redundancy) is connected on, and sets the load switch 180 corresponding to the load terminal 170 to which the second load L2 (load not requiring power redundancy) is connected off (step S403).

[0027] <Utilization of the sub-battery SB> A main battery MB is connected to the first power supply terminal 110, and a sub-battery SB is connected to the second power supply terminal 120. Even when the main battery MB is normal (i.e., during normal operation), the sub-battery SB may be used instead of the main battery MB.

[0028] For example, when the first power supply connected to the first power supply terminal 110 is normal and some of the loads connected to the multiple load terminals 170 (e.g., the first load L1) are not being used, the control unit 190 may set the interruption circuit 140 to an interrupted state, turn off the first switch 150, turn on the second switch 160, turn on the load switch 180 corresponding to the load terminal 170 to which a used load is connected among the multiple load terminals 170, and turn off the load switch 180 corresponding to the load terminal 170 to which an unused load is connected among the multiple load terminals 170.

[0029] In this way, it is possible to reduce the usage time of the main battery MB, and it is possible to extend the life of the main battery MB.

[0030] <First Switch 150 and Second Switch 160> The first switch 150 may be, for example, a switching element (for example, a MOSFET) having a body diode as shown in Fig. 5. In this case, in order to prevent reverse current, the forward direction of the body diode is from the first connection point CP1 to the load switch 180. In the example shown in Fig. 5, the first switch 150 is an N-type MOSFET, with a source connected to the first connection point CP1 and a drain connected to the load switch 180.

[0031] The second switch 160 may be, for example, a switching element (for example, a MOSFET) having a body diode as shown in Fig. 5. At this time, in order to prevent reverse current, the forward direction of the body diode is from the second connection point CP2 to the load switch 180. In the example shown in Fig. 5, the first switch 150 is an N-type MOSFET, with a source connected to the second connection point CP2 and a drain connected to the load switch 180.

[0032] 5, when the first switch 150 and the second switch 160 are switching elements having body diodes, and the forward direction of the body diode of the first switch 150 is from the first connection point CP1 to the load switch 180, and the forward direction of the body diode of the second switch 160 is from the second connection point CP2 to the load switch 180, the connection between the first switch 150 and the second switch 160 is a back-to-back connection. Therefore, in this case, when either the first switch 150 or the second switch 160 is off, no power flows through both the first switch 150 and the second switch 160.

[0033] The present invention has been described above in terms of preferred embodiments thereof. Although the present invention has been described herein with reference to specific examples, various modifications and variations can be made to these examples without departing from the spirit and scope of the present invention as set forth in the claims. [Explanation of symbols]

[0034] 100 Power supply 110 First power supply terminal 120 Second power supply terminal 130 Power Converter 140 Breaking Circuit 150 First Switch 160 Second Switch 170 Load terminal 180 Load Switch 190 Control section

Claims

1. a first power supply terminal for connecting a first power supply; a second power supply terminal for connecting a second power supply; a power converter connected between the first power supply terminal and the second power supply terminal; an interrupter circuit connected between the first power supply terminal and the power converter; a first switch and a second switch connected between a first connection point between the power converter and the interruption circuit and a second connection point between the power converter and the second power supply terminal; A plurality of load terminals for connecting to the load; a plurality of load switches corresponding one-to-one to the plurality of load terminals; A power supply device, wherein each of the plurality of load terminals is connected to a line connecting the first switch and the second switch via a corresponding load switch.

2. The first switch is a first connection point connected between the first connection point and the plurality of load switches; a switching element having a body diode whose forward direction is from the first connection point to the plurality of load switches, The second switch is a second connection point connected between the second connection point and the plurality of load switches; 2. The power supply device according to claim 1, wherein the load switch is a switching element having a body diode whose forward direction is from the second connection point to the plurality of load switches.

3. 2. The power supply of claim 1, wherein the load switch is an intelligent power device.

4. a control unit that controls the interrupter circuit, the first switch, the second switch, and the load switch, the first switch is connected between the first connection point and the plurality of load terminals; the second switch is connected between the second connection point and the plurality of load terminals; When the power supply connected to the first power supply terminal is abnormal, Put the interruption circuit into an interrupted state, Turning off the first switch; turning on the second switch; turning on a load switch corresponding to a load terminal to which a first load, which is a load requiring power supply redundancy, is connected among the plurality of load terminals; 2 . The power supply device according to claim 1 , further comprising: turning off a load switch corresponding to a load terminal to which a second load, which is a load not requiring power redundancy, is connected, among the plurality of load terminals.

5. When a power supply connected to the first power supply terminal is normal and a part of the loads connected to the plurality of load terminals is not in use, Put the interruption circuit into an interrupted state, turning off the first switch; turning on the second switch; turning on a load switch corresponding to a load terminal to which a load being used is connected among the plurality of load terminals; 5. The power supply device according to claim 4, further comprising: turning off a load switch corresponding to a load terminal to which an unused load is connected, among said plurality of load terminals.

6. 2. A control method executed by a computer for controlling the interrupter circuit, the first switch, the second switch, and the load switch of the power supply device according to claim 1, comprising: When an abnormality occurs in the power supply connected to the first power supply terminal, turning off the interrupter circuit and the first switch element; turning on the second switch element; turning on a load switch corresponding to a load terminal to which a first load, which is a load requiring power supply redundancy, is connected among the plurality of load terminals; a control method for turning off a load switch corresponding to a load terminal to which a second load, which is a load that does not require power supply redundancy, is connected, among the plurality of load terminals.

7. A control program that causes a computer to execute the control method according to claim 6.

8. A computer-readable storage medium storing the control program according to claim 7.

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