Boxes for storing electrical and electronic equipment

Abstract

To provide a box for housing an electric and electronic apparatus capable of switching three or more power sources.SOLUTION: A box 1 for housing an electric and electronic apparatus has two or more changeover switches for switching a connection destination of a common terminal between a first terminal and a second terminal. One changeover switch can connect a second power source with the second terminal while capable of connecting a first power source with the first terminal. One of other changeover switches can connect a third power source with either one of the first terminal or the second terminal.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a box for housing electrical and electronic equipment equipped with two or more switching switches.

Background Art

[0002] As described in Patent Document 1, a distribution board equipped with a switching switch capable of switching between a first power source and a second power source is known.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

[0004] By the way, when one switching switch for power source switching is installed in the distribution board, it is possible to switch between two power sources. However, when the outputs from both the first power source and the second power source are lost, the power supply from the distribution board to the load will be interrupted.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The inventor of the present case has earnestly studied this point and tried to solve it. The problem to be solved by the present invention is to provide a box for housing electrical and electronic equipment capable of switching three or more power sources.

Means for Solving the Problems

[0006] In order to solve the above problems, there is provided a box for housing electrical and electronic equipment equipped with two or more switching switches for switching the connection destination of a common terminal between a first terminal and a second terminal. One switching switch enables connection of a first power source to the first terminal and connection of a second power source to the second terminal, and one of the other switching switches enables connection of a third power source to either the first terminal or the second terminal.

[0007] Furthermore, it is preferable that the changeover switch be configured such that, when voltage is applied to both the first and second terminals, the connection to the common terminal is made to the terminal with higher priority, and when no voltage is applied to the terminal with higher priority and voltage is applied to the terminal with lower priority, the connection to the common terminal is made to the terminal with lower priority.

[0008] Furthermore, it is preferable to have a configuration that includes a first changeover switch to which the first or second terminal of a different changeover switch is connected to a common terminal, and a second changeover switch to which a power supply can be connected to one of the first and second terminals, and a common terminal of a different changeover switch can be connected to the other, and a load device can be connected to the common terminal.

[0009] Furthermore, it includes a third changeover switch to which a fourth power supply can be connected to one of the first and second terminals, a common terminal of a different changeover switch can be connected to the other terminal, and the first or second terminal of a different changeover switch can be connected to the common terminal. It is preferable to have this configuration.

[0010] Furthermore, it is preferable that all power supplies wired from the outside to the inside of the electrical and electronic equipment enclosure for connection to the changeover switch be of different types. [Effects of the Invention]

[0011] The present invention makes it possible to provide a housing box for electrical and electronic equipment that can switch between three or more power sources. [Brief explanation of the drawing]

[0012] [Figure 1] This diagram shows an example of the arrangement of electrical and electronic equipment stored in an electrical and electronic equipment enclosure. However, the lid and other parts of the enclosure are omitted. [Figure 2] This figure shows an example of the arrangement of electrical and electronic equipment housed in a different electrical and electronic equipment enclosure than the one shown in Figure 1. However, the lid and other parts of the electrical and electronic equipment enclosure are omitted. [Figure 3] This diagram shows an example of the relationship between the first and second changeover switches, the power supply, and the load equipment. However, the first changeover switch is shown with its first terminal connected to the common terminal, and the second changeover switch is shown with its first terminal connected to the common terminal. [Figure 4] This diagram shows an example of the relationship between the first and second changeover switches, the power supply, and the load equipment. However, the first changeover switch is shown with its second terminal connected to the common terminal, and the second changeover switch is shown with its first terminal connected to the common terminal. [Figure 5] This diagram shows an example of the relationship between the first and second changeover switches, the power supply, and the load equipment. However, the first changeover switch is shown with its second terminal connected to the common terminal, and the second changeover switch is shown with its second terminal connected to the common terminal. [Figure 6] This diagram shows an example of the arrangement of electrical and electronic equipment housed in an electrical and electronic equipment enclosure. However, unlike Figure 2, this diagram shows an example where the power supply is connected to the first terminal of the second changeover switch. [Figure 7] This diagram shows an example of the relationship between the first and second changeover switches, the power supply, and the load equipment. However, the first changeover switch is shown with its first terminal connected to the common terminal, and the second changeover switch is shown with its first terminal connected to the common terminal. [Figure 8] This diagram shows an example of the relationship between the first and second changeover switches, the power supply, and the load equipment. However, the first changeover switch is shown with its first terminal connected to the common terminal, and the second changeover switch is shown with its second terminal connected to the common terminal. [Figure 9] This diagram shows an example of the relationship between the first and second changeover switches, the power supply, and the load equipment. However, the first changeover switch is shown with its second terminal connected to the common terminal, and the second changeover switch is shown with its second terminal connected to the common terminal. [Figure 10] This diagram shows an example of how to connect each of the three changeover switches to the power supply and load equipment when they are housed in an electrical and electronic equipment enclosure. [Figure 11]FIG. is a diagram showing a connection example of a first switching switch, a second switching switch, a third switching switch, a power source, and a load device. However, the first switching switch represents a state in which the first terminal is connected to the common terminal, the second switching switch represents a state in which the first terminal is connected to the common terminal, and the third switching switch represents a state in which the first terminal is connected to the common terminal. [Figure 12] FIG. is a diagram showing an arrangement example of electrical and electronic devices housed in an electrical and electronic device storage box different from FIG. 1. However, the lid of the electrical and electronic device storage box and the like are omitted. [Figure 13] FIG. is a diagram showing an arrangement example of electrical and electronic devices housed in an electrical and electronic device storage box different from FIG. 1. However, the lid of the electrical and electronic device storage box and the like are omitted. [Figure 14] FIG. is a diagram showing an arrangement example of electrical and electronic devices housed in an electrical and electronic device storage box different from FIG. 1. However, the lid of the electrical and electronic device storage box and the like are omitted. [Figure 15] FIG. is a diagram showing an arrangement example of electrical and electronic devices housed in an electrical and electronic device storage box different from FIG. 2. However, the lid of the electrical and electronic device storage box and the like are omitted.

BEST MODE FOR CARRYING OUT THE INVENTION

[0013] The best mode for carrying out the invention is shown below. As can be understood from FIGS. 1 to 5, the electrical and electronic device storage box 1 of the present embodiment includes two or more switching switches that switch the connection destination of the common terminal between the first terminal and the second terminal. One switching switch of this electrical and electronic device storage box 1 enables a first power source to be connected to the first terminal and a second power source to be connected to the second terminal, and one of the other switching switches enables a third power source to be connected to either the first terminal or the second terminal. Therefore, it is possible to provide an electrical and electronic device storage box 1 that can switch three or more power sources.

[0014] The box 1 for housing electrical and electronic devices includes a housing and electrical and electronic devices housed in the housing. Also, the electrical and electronic devices provided in the box 1 for housing electrical and electronic devices may be any devices related to electricity or electronics. As typical electrical and electronic devices, a breaker 81, a switch, a transformer, a relay, a communication device, a measuring device, a control device, a sensor device, an air conditioning device, etc. can be exemplified. Note that the electrical and electronic devices include changeover switches, and it is needless to say that the box 1 for housing electrical and electronic devices is formed even when only a plurality of changeover switches are housed in the housing.

[0015] Hereinafter, mainly, the box 1 for housing electrical and electronic devices for the purpose of distribution such as a power switchboard, a distribution board, a switchboard, a control board, high-voltage power receiving equipment, etc., which are mainly for the purpose of switching the power supply, will be described. However, the box 1 for housing electrical and electronic devices may also be a system rack equipped with a server, a communication device, an arithmetic device, etc.

[0016] The changeover switch of the embodiment includes three types of terminals: a first terminal, a second terminal, and a common terminal, and it is possible to switch the connection destination of the common terminal between the first terminal and the second terminal. Various things such as a power supply, electrical and electronic devices (including the changeover switch), a load device 91, etc. can be connected to each of the first terminal, the second terminal, and the common terminal.

[0017] The power supply may be any thing that serves as a source of electrical energy. Typically, "commercial power supply", "battery (for example, chemical batteries such as primary batteries, secondary batteries (for example, storage batteries), fuel cells, etc., and physical batteries such as solar cells)", "generator (generator using fuel such as gasoline, etc.)", "power generation equipment (thermal power generation, hydraulic power generation, wind power generation, solar power generation (equipment equipped with solar cells and storage batteries), geothermal power generation, biomass power generation, etc.)", etc. can be exemplified.

[0018] As can be seen from the examples above, there are multiple types of power sources that supply power to the electrical and electronic equipment storage box 1. Not only are power sources from different categories, such as commercial power and batteries, or generators and power generation equipment, considered different types of power sources, but even power sources from the same category, such as secondary batteries and physical batteries, or wind power and solar power, can be of different types. Furthermore, solar cells are different types of power sources in that they consist only of solar panels, while solar power generation is a system equipped with both solar panels and storage batteries.

[0019] It is preferable that all power supplies wired from the outside to the inside of the electrical and electronic equipment housing box 1 for connection to the changeover switch be of different types.

[0020] The electricity sent from the power source to the changeover switch is then sent from the changeover switch to the load equipment 91. This load equipment 91 is a device that operates by consuming the supplied electrical energy. The changeover switch and the load equipment 91 are not limited to being directly connected; they may also be connected via a circuit breaker or the like. Alternatively, the changeover switch and the load equipment 91 may be connected via a distribution board or switchboard capable of supplying power to multiple load equipment 91.

[0021] By the way, the changeover switch in this embodiment switches the connection destination of the common terminal between the first terminal and the second terminal. This explanation will describe a system where the switching is performed automatically, but the switching may also be performed manually. More specifically, the voltage applied to the first and second terminals is checked, and the switching is performed automatically as needed based on the results. If the switching is manual, it is performed manually as needed.

[0022] For example, voltage may be applied to both the first and second terminals. Therefore, it is preferable to set one of the first or second terminals to have a higher priority. By setting one of the first or second terminals to have a higher priority, even when voltage is applied to both the first and second terminals, either the first or second terminal can be designated as the connection destination for the common terminal.

[0023] Furthermore, it is preferable that the changeover switch be configured such that, when voltage is applied to both the first and second terminals, the connection to the common terminal is made to the terminal with higher priority among the first and second terminals, and when no voltage is applied to the terminal with higher priority and voltage is applied to the terminal with lower priority, the connection to the common terminal is made to the terminal with lower priority among the first and second terminals.

[0024] For example, suppose power supply A is connected to the first terminal 11 and power supply B is connected to the second terminal 12, as shown in Figures 1 and 2. In this situation, if the priority of the first terminal 11 is set higher, and power is being supplied normally to both the first terminal 11 and the second terminal 12 from both power supply A and power supply B, then the common terminal 13 will be connected to the first terminal 11. In other words, the common terminal 13 will be powered by power supply A.

[0025] Furthermore, if a malfunction occurs in power supply A in this situation, and power is no longer supplied from power supply A to the first terminal 11 (i.e., the normal voltage is no longer applied), the connection destination of the common terminal 13 will be switched to the second terminal 12, and power will be supplied from power supply B.

[0026] Subsequently, once the abnormality in power supply A is resolved and power supply from power supply A to the first terminal 11 is resumed (normal voltage is applied), the connection destination of the common terminal 13 is switched to the first terminal 11, and power is supplied from power supply A.

[0027] If the priority of the second terminal 12 is set higher than that of the first terminal 11, the relationship between the first terminal 11 and the second terminal 12 will be reversed from the explanation above, and the common terminal 13 will normally be connected to the second terminal 12. In other words, power is normally supplied from power supply B to the common terminal 13.

[0028] In the electrical and electronic equipment storage box 1 of this embodiment, by providing two or more changeover switches that can operate as described above, it is possible to switch between three or more power sources. Furthermore, by setting a priority for each power source, power can be supplied preferentially starting with the power source with the highest priority.

[0029] Here, we will describe an example in which two changeover switches are provided in the electrical and electronic equipment storage box 1. One of the two changeover switches will be called the first changeover switch 10 and the other the second changeover switch 20. As can be seen from Figure 1, the first changeover switch 10 allows power supply A to be connected to the first terminal 11 via the breaker 81, and power supply B to be connected to the second terminal 12 via the breaker 81, and the first terminal 21 of the second changeover switch 20 is connected to the common terminal 13. The second changeover switch 20 has the common terminal 13 of the first changeover switch 10 connected to the first terminal 21, allows power supply C to be connected to the second terminal 22 via the breaker 81, and connects load equipment 91 to the common terminal 23.

[0030] Thus, it is preferable to have a configuration comprising: a first changeover switch 10 that connects to a common terminal either the first or second terminal of a changeover switch different from itself; and a second changeover switch 20 that allows a power supply to be connected to one of the first terminal 21 and the second terminal 22, allows a common terminal of a changeover switch different from itself to be connected to the other, and allows a load device 91 to be connected to the common terminal 23.

[0031] Since the circuit breaker 81 does not necessarily need to be housed in the same electrical and electronic equipment enclosure 1 as the changeover switch, the electrical and electronic equipment enclosure 1 may contain only the changeover switch, and the configuration may include two or more of these changeover switches (see Figure 2). In addition, the connection between the terminals of the changeover switch and the power supply and load equipment 91 may be made via the circuit breaker 81.

[0032] Furthermore, a configuration in which "power can be connected to the terminal" includes not only a configuration in which the terminal and the power supply are directly connected and power is constantly supplied from the power supply to the terminal, but also a configuration in which the terminal and the power supply are connected via a circuit breaker 81 and power is supplied from the power supply to the terminal when the circuit breaker 81 is turned ON. In addition, there may be a configuration in which the terminal and the power supply are not normally connected, and power is supplied from the power supply to the terminal by connecting a connecting component such as an outlet or plug connected to the terminal to a connected component such as a plug or outlet provided on the power supply.

[0033] Here, we will explain an example where the priority of both the first changeover switch 10 and the second changeover switch 20 is set to the first terminal. When power is supplied from power source A to the first terminal 11 of the first changeover switch 10, and as shown in Figure 3, the common terminal 13 is already connected to the first terminal 11, the state remains the same. However, as shown in Figures 4 and 5, if the common terminal 13 is connected to the second terminal 12, the connection of the common terminal 13 switches to the first terminal 11. In this way, power is supplied from power source A to the secondary side of the first changeover switch 10 via the first terminal 11 and the common terminal 13.

[0034] In the examples shown in Figures 1 and 3, the common terminal 13 of the first changeover switch 10 is connected to the first terminal 21 of the second changeover switch 20, so power is supplied from power source A to the first terminal 21 via the first changeover switch 10. If the common terminal 23 of the second changeover switch 20 is connected to the first terminal 21, power is supplied directly from power source A to the secondary side of the second changeover switch 20. However, if the common terminal 23 of the second changeover switch 20 is connected to the second terminal 22, the connection of the common terminal 23 is switched to the first terminal 11, so power is supplied from power source A to the load equipment 91 via the first changeover switch 10 and the second changeover switch 20.

[0035] If there is no power supply from power source A, and power is supplied from power source B to the second terminal 12 of the first changeover switch 10, and as shown in Figure 4, the common terminal 13 is already connected to the second terminal 12, then this state is maintained. If the common terminal 13 is connected to the first terminal 11, as shown in Figure 3, then the connection of the common terminal 13 is switched to the second terminal 12. In this way, power is supplied from power source B to the second changeover switch 20 via the second terminal 12 and common terminal 13 of the first changeover switch 10. After that, the flow for supplying power to the load equipment 91 should be the same as in the example described above.

[0036] When there is no power supply from power sources A and B, and power is supplied from power source C to the second terminal 22 of the second changeover switch 20, and as shown in Figure 5, the common terminal 23 is already connected to the second terminal 22, the state is maintained. As shown in Figures 3 and 4, if the common terminal 23 is connected to the first terminal 21, the connection of the common terminal 23 is switched to the second terminal 22. In this way, power is supplied from power source C to the load device 91 via the second terminal 22 and the common terminal 23.

[0037] In the example above, power supply A has the highest priority among power supply A, power supply B, and power supply C, and power supply C has the lowest priority. In other words, power supply A is used preferentially, followed by power supply B, and power supply C is used only when neither A nor B is available. In this example, when power supply A and B are not supplying power and power supply C is supplying power, if power supply A or B resumes supplying power to each terminal, the system will switch to supplying power from A or B.

[0038] Next, we will explain the case where the priority of both the first changeover switch 10 and the second changeover switch 20 is set to the second terminal. When power is supplied from the power supply C to the second terminal 22 of the second changeover switch 20, and as shown in Figure 5, if the common terminal 23 is already connected to the second terminal 22, the state remains the same. If the common terminal 23 is connected to the first terminal 21, the connection of the common terminal 23 switches to the second terminal 22. In this way, power is supplied from the power supply C to the load equipment 91 via the second terminal 22 and the common terminal 23.

[0039] When there is no power supply from power source C, and power is supplied from power source B to the second terminal 12 of the first changeover switch 10, as shown in Figure 4, if the common terminal 13 is connected to the second terminal 12, the state remains the same. As shown in Figure 3, if the common terminal 13 is connected to the first terminal 11, the connection of the common terminal 13 switches to the second terminal 12. In this way, power is supplied from power source B to the secondary side of the first changeover switch 10 via the second terminal 12 and the common terminal 13.

[0040] On the other hand, the common terminal 13 of the first changeover switch 10 is connected to the first terminal 21 of the second changeover switch 20, so power is supplied from power source B to the first terminal 21. In the case where there is no power supply from power source C in the second changeover switch 20, and power is supplied from power source B to the first terminal 21, as shown in Figure 4, if the common terminal 23 is already connected to the first terminal 21, the state remains the same. As shown in Figure 5, if the common terminal 23 is connected to the second terminal 22, the connection of the common terminal 23 switches to the first terminal 21. In this way, power is supplied from power source B to the load equipment 91 via the first changeover switch 10 and the second changeover switch 20.

[0041] When there is no power supply from power sources C and B, and power is supplied from power source A to the first terminal 11 of the first changeover switch 10, as shown in Figure 3, if the common terminal 13 is connected to the first terminal 11, the state remains the same. As shown in Figure 4, if the common terminal 13 is connected to the second terminal 12, the connection of the common terminal 13 switches to the first terminal 11. In this way, power is supplied from power source A to the secondary side of the second changeover switch 20 via the first terminal 11 and the second terminal 13. After that, the flow for supplying power to the load equipment 91 should be the same as in the example described above.

[0042] In other words, among power sources A, B, and C, power source C has the highest priority, and power source A has the lowest. This means that power source C is used preferentially, followed by power source B, and only when neither C nor B is available is power source A used. In this example, when power is not being supplied from power sources C or B and power is being supplied from power source A, if power supply to each terminal is resumed from power sources C or B, the system will switch to supplying power from power sources C or B.

[0043] In particular, when power supply from power source C to the second terminal 22 of the second changeover switch 20 is restored, power source C can be used simply by switching the connection destination of the common terminal 23 of the second changeover switch 20 to the second terminal 22, thus allowing the use of the higher priority power source to be immediately utilized.

[0044] Next, we will explain an example in which the electrical and electronic equipment housed in the electrical and electronic equipment housing box 1 consists only of two changeover switches, and the second changeover switch 20 is configured to allow connection of power supply C to the first terminal 21 and to connect the common terminal 13 of the first changeover switch 10 to the second terminal 22 (see Figure 6). In this example, the electrical and electronic equipment housing box 1 does not house the circuit breaker 81 interposed between the power supply and the changeover switch, as shown in Figure 1. Of course, the power supply and the changeover switch may be directly connected.

[0045] In this example, as in the example described above, one of the two changeover switches is designated as the first changeover switch 10 and the other as the second changeover switch 20. The first changeover switch 10 is configured to accept power supply A to its first terminal 11 and power supply B to its second terminal 12, and its common terminal 13 is connected to the second terminal 22 of the second changeover switch 20. The second changeover switch 20 is configured to accept power supply C to its first terminal 21, its second terminal 22 is connected to the common terminal 13 of the first changeover switch 10, and its common terminal 23 is connected to the load device 91.

[0046] In this way, we will explain an example where the priority of both the first changeover switch 10 and the second changeover switch 20 is set to the first terminal, as shown in Figure 6. When power is supplied from the power supply C to the first terminal 21 of the second changeover switch 20, and as shown in Figure 7, the connection destination of the common terminal 23 is already the first terminal 21, the state is maintained. As shown in Figures 8 and 9, if the connection destination of the common terminal 23 is the second terminal 22, the connection destination of the common terminal 23 is switched to the first terminal 21. In this way, power is supplied from the power supply C to the load equipment 91 via the first terminal 21 and the second terminal 22.

[0047] When there is no power supply from power supply C, and power supply A is supplying power to the first terminal 11 of the first changeover switch 10, and as shown in Figure 8, if the common terminal 13 is already connected to the first terminal 11, the state is maintained. If the common terminal 13 is connected to the second terminal 12, as shown in Figure 9, the connection of the common terminal 13 is switched to the first terminal 11. In this way, power is supplied from power supply A to the secondary side of the first changeover switch 10 via the first terminal 11 and the common terminal 13.

[0048] On the other hand, the common terminal 13 of the first changeover switch 10 is connected to the second terminal 22 of the second changeover switch 20, so power is supplied from power source A to the second terminal 22. In the case where there is no power supply from power source C and power is supplied from power source A to the second terminal 22, and as shown in Figure 8 the common terminal 23 is already connected to the second terminal 22, the state is maintained, and as shown in Figure 7 the common terminal 23 is connected to the first terminal 21, the connection destination of the common terminal 23 is switched to the second terminal 22. In this way, power is supplied from power source A to the load equipment 91 via the first changeover switch 10 and the second changeover switch 20.

[0049] If there is no power supply from power sources C and A, and power is supplied from power source B to the second terminal 12 of the first changeover switch 10, and as shown in Figure 9, the common terminal 13 is already connected to the second terminal 12, then the current state is maintained. If the common terminal 13 is connected to the first terminal 11, as shown in Figure 8, then the connection of the common terminal 13 is switched to the second terminal 12. In this way, power is supplied from power source B to the secondary side of the first changeover switch 10 via the second terminal 12 and the common terminal 13. After that, the flow for supplying power to the load equipment 91 should be the same as in the example described above.

[0050] In the example above, power supply C has the highest priority among power supplies A, B, and C, and power supply B has the lowest priority. In other words, power supply C is used preferentially, followed by power supply A, and power supply B is used only when neither C nor A is available.

[0051] Next, we will explain an example where the priority of both the first changeover switch 10 and the second changeover switch 20 is set to the second terminal, as shown in Figure 6. When power is supplied from power source B to the second terminal 12 of the first changeover switch 10, and as shown in Figure 9, the connection destination of the common terminal 13 is already the second terminal 12, the state is maintained. If the connection destination of the common terminal 13 is the first terminal 11, as shown in Figures 7 and 8, the connection destination of the common terminal 13 is switched to the second terminal 12. In this way, power is supplied from power source B to the secondary side of the first changeover switch 10 via the second terminal 12 and the common terminal 13.

[0052] On the other hand, the common terminal 13 of the first changeover switch 10 is connected to the second terminal 22 of the second changeover switch 20, so power is supplied from power source B to the second terminal 22. If power is already being supplied from power source B to the second terminal 22, and as shown in Figure 9, the common terminal 23 is already connected to the second terminal 22, the current state is maintained. If the common terminal 23 is connected to the first terminal 21, the connection of the common terminal 23 is switched to the second terminal 22. In this way, power is supplied from power source B to the load equipment 91 via the first changeover switch 10 and the second changeover switch 20.

[0053] If there is no power supply from power source B, and power is supplied from power source A to the first terminal 11 of the first changeover switch 10, and as shown in Figures 7 and 8, the common terminal 13 is already connected to the first terminal 11, then this state is maintained. If the common terminal 13 is connected to the second terminal 12, as shown in Figure 9, then the connection of the common terminal 13 is switched to the first terminal 11. In this way, power is supplied from power source A to the secondary side of the first changeover switch 10 via the first terminal 11 and the common terminal 13. After that, the flow for supplying power to the load equipment 91 should be the same as in the example described above.

[0054] When there is no power supply from power sources B and A, and power is supplied from power source C to the first terminal 21 of the second changeover switch 20, and as shown in Figure 7, if the common terminal 23 is already connected to the first terminal 21, the state is maintained. If the common terminal 23 is connected to the second terminal 22, as shown in Figures 8 and 9, the connection of the common terminal 23 is switched to the first terminal. In this way, the load equipment 91 is powered from power source C via the first terminal 21 and the second terminal 23.

[0055] In the example above, power supply B has the highest priority among power supply A, power supply B, and power supply C has the lowest priority. In other words, power supply B is used preferentially, followed by power supply A, and power supply C is used only when neither power supply B nor power supply A is available.

[0056] In the example described above, the priority of each power supply was explained when the priority of both the first changeover switch 10 and the second changeover switch 20 is set to the same terminal. However, the priority of the first changeover switch 10 and the second changeover switch 20 may be set to different terminals. In that case, the priority of the power supply will change.

[0057] Next, we will describe an example in which three changeover switches are provided in the electrical and electronic equipment storage box 1 (see Figure 10). One of the three changeover switches will be designated as the first changeover switch 10, another as the second changeover switch 20, and the remaining one as the third changeover switch 30. In the example shown in Figure 10, the first changeover switch 10 is configured to allow connection of power supply A to its first terminal 11, to allow connection of power supply B to its second terminal 12, and to connect the second terminal 32 of the third changeover switch 30 to its common terminal 13. The third changeover switch 30 is configured to allow connection of power supply C to its first terminal 31, to connect the common terminal 13 of the first changeover switch 10 to its second terminal 32, and to connect the second terminal 22 of the second changeover switch 20 to its common terminal 33. The second changeover switch 20 is configured to allow connection of power supply D to its first terminal 21, to connect the common terminal 33 of the third changeover switch 30 to its second terminal 22, and to connect the load equipment 91 to its common terminal 23.

[0058] As can be seen from this example, it is preferable to have a configuration that includes a third changeover switch 30 to which a fourth power supply can be connected to one of the first terminal 31 and the second terminal 32, a common terminal of a different changeover switch can be connected to the other, and the first or second terminal of a different changeover switch can be connected to the common terminal 33.

[0059] In the example shown in Figure 10, when the priority of the first changeover switch 10, the second changeover switch 20, and the third changeover switch 30 is all set to the first terminal, as can be understood from Figure 11, when all power sources are available, power source D is used preferentially, followed by power source C, then power source A, and only when none of the above are available is power source B used.

[0060] In the example shown in Figure 10, if the priority of the first changeover switch 10, the second changeover switch 20, and the third changeover switch 30 is all set to the second terminal, as can be understood from Figure 11, when all power sources are available, power source B will be used preferentially, followed by power source A, then power source C, and only when none of the above are available will power source D be used.

[0061] Of course, the priority of the first changeover switch 10, the second changeover switch 20, and the third changeover switch 30 may each be set to different terminals. The power supply priority can be changed by changing these settings.

[0062] Here, we will explain an example using the example shown in Figure 1, specifically illustrating the application of power sources. In the example shown in Figure 1, power source A is commercial power, power source B is solar power generation, power source C is the battery of an electric vehicle (including hybrid cars), and the electrical and electronic equipment storage box 1 is described as a power switching panel.

[0063] As mentioned above, the priority order is commercial power, solar power, and electric vehicle batteries. Therefore, when the commercial power supply is functioning normally, power is supplied to the power switch panel from the commercial power supply. If the commercial power supply fails, power is supplied to the power switch panel from solar power. If neither commercial power nor solar power is available, power is supplied to the power switch panel from the electric vehicle batteries.

[0064] Solar power generation systems consist of solar panels and storage batteries. Electricity generated by the solar panels is stored in the storage batteries and then supplied from the batteries. If the commercial power supply is interrupted, or if the solar panels do not generate enough electricity due to bad weather, and the storage batteries do not have the required amount of electricity, the solar power generation system is deemed to be malfunctioning, and power is supplied to the power switching panel from the battery of an electric vehicle.

[0065] Incidentally, it is preferable that the connection between the electric vehicle battery and the second terminal 22 of the second changeover switch 20 be made by connecting a connecting member and a connected member as needed. In this case, after the connecting member and the connected member are connected and power is supplied from the electric vehicle battery to the second terminal 22 of the second changeover switch 20, the connection destination of the common terminal 23 of the second changeover switch 20 is switched to the second terminal 22.

[0066] The electrical and electronic equipment enclosure 1 may have a circuit breaker 81 placed between the power supply and the changeover switch, as shown in Figure 1, but the arrangement of the changeover switch and the circuit breaker is not particularly limited. For example, as shown in Figure 12, the circuit breaker 81 and the changeover switch may be arranged alternately, or as shown in Figure 13, the circuit breaker 81 may be grouped together on one end and the changeover switch may be grouped together on the other end.

[0067] Alternatively, as shown in Figure 2, the electrical and electronic equipment housing box 1 may consist of two or more changeover switches, or, as shown in Figure 14, a circuit breaker 81 may be placed between the changeover switches and the load equipment 91.

[0068] Furthermore, as shown in the electrical and electronic equipment housing box 1 in Figure 15, two power sources may be connected to the first terminal 11 of the first changeover switch 10. When two power sources are connected to the first terminal 11 of the first changeover switch 10, for example, if power source A is commercial power and power source B is solar power, and the electricity generated by solar power is greater than the electricity consumed by the load equipment 91, then the electricity will be supplied by solar power, and any surplus will be charged to the battery. Also, if the electricity generated by solar power is less than the electricity consumed by the load equipment 91, the shortfall will be supplied by commercial power.

[0069] In this case, if the commercial power supply fails, the power supply from the solar power generation to the first terminal 11 of the first changeover switch 10 is also stopped to prevent the electricity generated by the solar power generation from flowing back to the commercial power supply. As a result, if there is power supply from power source C to the second terminal 12 of the first changeover switch 10, the connection destination of the common terminal 13 of the first changeover switch 10 switches to the second terminal 12. Power source C may be a power source different from the commercial power supply or the solar power generation, or power source C and power source B may be a common solar power generation. In other words, the solar power generation may be provided with a first route that supplies power to the first terminal 11 of the first changeover switch 10 and a second route that supplies power to the second terminal 12 of the first changeover switch 10, and when the commercial power supply is normal, power may be supplied from the first route, and when a commercial power outage is detected, the route may be switched and power may be supplied from the second route.

[0070] Although the present invention has been described above with reference to the embodiments, the present invention is not limited to the above embodiments and can be implemented in various forms. [Explanation of symbols]

[0071] 1. Box for storing electrical and electronic equipment 10 First switching switch 11 First terminal (first switching switch) 12 Second terminal (first switching switch) 13 Common terminal (first switching switch) 20 Second changeover switch 21 First terminal (Second changeover switch) 22 Second terminal (second changeover switch) 23 Common terminal (second changeover switch) 91 Load equipment

Claims

1. An electrical and electronic equipment enclosure equipped with two or more changeover switches for switching the connection destination of a common terminal between a first terminal and a second terminal, One changeover switch allows a first power supply to be connected to the first terminal and a second power supply to be connected to the second terminal. One of the other changeover switches allows a third power supply to be connected to either the first or second terminal. The changeover switch is, When voltage is applied to both the first and second terminals, the connection to the common terminal should be to the terminal with the higher priority between the first and second terminals. If no voltage is applied to the terminal with higher priority than the first terminal, and voltage is applied to the terminal with lower priority, the connection to the common terminal will be to the terminal with lower priority than the first terminal. One of the aforementioned other changeover switches is an electrical and electronic equipment enclosure capable of automatically switching the connection destination of a common terminal between the first terminal and the second terminal.

2. A first changeover switch that connects the first or second terminal of a different changeover switch to its common terminal, A second changeover switch that allows a power supply to be connected to one of its first and second terminals, and a common terminal of a different changeover switch to be connected to the other terminal, and a load device to be connected to the common terminal, A box for housing electrical and electronic equipment according to claim 1, comprising the above.

3. A housing for electrical and electronic equipment, comprising two or more changeover switches for switching the connection destination of a common terminal between a first terminal and a second terminal, One changeover switch allows a first power supply to be connected to the first terminal and a second power supply to be connected to the second terminal. One of the other changeover switches allows a third power supply to be connected to either the first or second terminal. An electrical and electronic equipment enclosure comprising a third changeover switch, which has a first terminal and a second terminal to which a fourth power supply can be connected, a common terminal of a different changeover switch connected to the other terminal, and a first or second terminal of a different changeover switch connected to the common terminal.

4. An electrical and electronic equipment enclosure according to any one of claims 1 to 3, wherein all power supplies wired from the outside to the inside of the enclosure for connection to a changeover switch are of different types.

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