Power Conversion Device

Abstract

To provide a power converter capable of suppressing the occurrence of arc.SOLUTION: The power converter includes a power supply unit 53 and a detection unit 54. The power supply unit 53 converts the primary side voltage applied across a pair of primary side terminals 52a and 52b into the secondary side voltage of the predetermined voltage value and outputs the same to a pair of secondary side terminals 55a and 55b. The detection unit 54 detects the voltage at the primary side. The power supply unit 53 stops the output of the secondary side voltage based on the voltage fluctuation at the primary side detected by the detection unit 54.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure generally relates to a power conversion device, and more particularly to a power conversion device that converts a primary side voltage into a secondary side voltage with a predetermined voltage value. [Background technology]

[0002] Patent Document 1 describes a duct rail to which a DC current is supplied from a DC power supply unit, and a duct plug that is attached to the duct rail and supplies the DC current to a lighting device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-313131 Summary of the Invention [Problem to be solved by the invention]

[0004] In the duct plug (power conversion device) described in Patent Document 1, for example, when attaching or detaching the power conversion device to or from a duct rail while a lighting device is attached to the power conversion device, there is a possibility that an arc may occur.

[0005] The present disclosure has been made in view of the above circumstances, and has an object to provide a power conversion device that can suppress the occurrence of arcs. [Means for solving the problem]

[0006] A power conversion device according to one aspect of the present disclosure includes: The power conversion device is configured to be detachably attached to a DC duct that holds the first conductive bar and the second conductive bar. The power supply unit converts a primary voltage applied between a pair of primary terminals into a secondary voltage of a predetermined voltage value and outputs the secondary voltage to the pair of secondary terminals. The detector detects the primary voltage. The power supply unit stops outputting the secondary voltage based on fluctuations in the primary voltage detected by the detector. The power supply unit can receive a signal for controlling on / off of the operation of the power supply unit, and the detection unit outputs an operation-off signal to the power supply unit based on the fluctuation of the primary side voltage detected by the detection unit, thereby stopping the output of the secondary side voltage. [Effects of the Invention]

[0007] According to the power conversion device according to the above aspect of the present disclosure, it is possible to suppress the occurrence of arcs. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of a DC duct system according to the first embodiment. [Figure 2] FIG. 2 is a schematic diagram showing the appearance of the DC duct and the power conversion device according to the embodiment. [Figure 3] FIG. 3 is a circuit diagram of a main part of the power conversion device according to the above embodiment. [Figure 4] FIG. 4 is a circuit diagram of a main part of a power conversion device according to the second embodiment. [Figure 5] FIG. 5 is a circuit diagram of a main part of a power conversion device according to the third embodiment. [Figure 6] FIG. 6 is a circuit diagram of a main part of a power conversion device according to a modification of the above embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Preferred embodiments of the present disclosure will be described in detail below with reference to the drawings. Elements common to the embodiments described below are designated by the same reference numerals, and redundant descriptions of the common elements will be omitted. The following embodiment is merely one of various embodiments of the present disclosure. Various modifications can be made to the embodiment depending on the design, etc., as long as the object of the present disclosure can be achieved.

[0010] The drawings described in this disclosure are schematic drawings, and the ratios of the sizes and thicknesses of the components in the drawings do not necessarily reflect the actual dimensional ratios.

[0011] In this disclosure, "perpendicular" does not only mean that the angle between two objects is exactly 90 degrees, but also means that the angle between two objects is approximately perpendicular within a certain margin of error. In other words, the angle between two objects that are perpendicular to each other falls within a certain margin of error (for example, 10 degrees or less) from 90 degrees.

[0012] In the embodiments, when comparing two values ​​such as measurement data, "less than" may be replaced with "less than." In other words, whether or not a comparison of two values ​​includes cases where the two values ​​are equal can be arbitrarily changed depending on the setting of the reference value, etc., so there is no technical difference between "less than" and "less than." Similarly, "greater than" may be replaced with "exceeding."

[0013] (Embodiment 1) (1) Overview First, an overview of a DC duct system 10 according to a first embodiment will be described with reference to FIGS.

[0014] In the following description, the direction along the longitudinal direction of the DC duct 3 is defined as the left-right direction. Furthermore, the direction along the normal to the surface of the top plate 61 on which objects are placed is defined as the up-down direction, and the direction perpendicular to the left-right and up-down directions is defined as the front-rear direction. However, these directional definitions are not intended to limit the direction in which the DC duct system 10 is used. Furthermore, the arrows representing front-rear, left-right, and up-down in Figure 1 and elsewhere are merely shown for the purpose of explanation and do not have any substance.

[0015] As shown in Fig. 1, the DC duct system 10 according to the first embodiment includes a DC duct 3 and a plurality of (three in the example of Fig. 1) power converters 5. In the following description, each of the plurality of power converters 5 may be simply referred to as a "power converter 5."

[0016] 2, the DC duct 3 is formed in a long rod shape. The DC duct 3 has a first conductive bar 32 and a second conductive bar 33. The first conductive bar 32 and the second conductive bar 33 are formed in a long rod shape. The power conversion device 5 can be attached to and detached from the DC duct 3 at any position in the longitudinal direction of the first conductive bar 32 and the second conductive bar 33.

[0017] 3, the power conversion device 5 has a pair of primary terminals 52a, 52b. The primary terminal 52a is an upstream terminal and is connected to the first conductive bar 32 on the positive side. The primary terminal 52b is a downstream terminal and is connected to the second conductive bar 33 on the negative side. By connecting the primary terminal 52a to the first conductive bar 32 and the primary terminal 52b to the second conductive bar 33, DC power is supplied to the power conversion device 5 from the first conductive bar 32 and the second conductive bar 33.

[0018] The power conversion device 5 includes a power supply unit 53. The power supply unit 53 converts a primary voltage applied across a pair of primary terminals 52a, 52b into a secondary voltage of a predetermined voltage value, and outputs the secondary voltage to a pair of secondary terminals 55a, 55b.

[0019] 2, the power conversion device 5 has a first outlet 511 and a second outlet 512. The first outlet 511 and the second outlet 512 are each electrically connected to a pair of secondary-side terminals 55a, 55b. Note that, in the present disclosure, "electrically connected" refers to a connection in an electrically conductive state, and includes not only a direct connection but also an indirect connection via a conductor such as an electric wire or a circuit pattern.

[0020] Connectors of electrical devices can be connected to the first socket 511 and the second socket 512. Examples of electrical devices include computer terminals (personal computers, smartphones, tablet terminals, etc.), computer terminal accessories (monitors, speakers, microphones, etc.), lighting equipment (desk lamps, etc.), network cameras, sensors (temperature sensors, humidity sensors, illuminance sensors, etc.), game consoles, and air conditioning equipment (desk fans, etc.).

[0021] The power converter 5 can supply DC power to the electrical device by connecting a connector of the electrical device to the first outlet 511 or the second outlet 512. In other words, the DC duct 3 supplies DC power to the electrical device via the power converter 5.

[0022] 3, the power conversion device 5 further includes a detection unit 54. The detection unit 54 detects the primary side voltage. Then, the power supply unit 53 stops outputting the secondary side voltage based on the fluctuation in the primary side voltage detected by the detection unit 54.

[0023] In a conventional power conversion device, for example, when an attempt is made to remove the power conversion device from the DC duct 3 while an electrical device is connected to the power conversion device, an arc may occur between the DC duct 3 and the power conversion device. Furthermore, when the power conversion device is removed from the DC duct 3, fluctuations in the primary side voltage occur, such as a drop in the primary side voltage.

[0024] The power converter 5 of the first embodiment can suppress the occurrence of an arc by stopping the output of the secondary voltage based on a fluctuation in the primary voltage such as a drop in the primary voltage. More specifically, the power converter 5 can suppress the occurrence of an arc when the power converter 5 is attached to or detached from the DC duct 3 by stopping the output of the secondary voltage based on a fluctuation in the primary voltage such as a drop in the primary voltage.

[0025] (2) Details Hereinafter, a detailed configuration of the DC duct system 10 according to the first embodiment will be described with reference to FIGS.

[0026] (2.1) DC Duct System Configuration As shown in FIG. 1, the DC duct system 10 includes a duct fixture F1, a DC duct 3, an AC adapter 4, a power converter 5, and a desk 6.

[0027] (2.2)Desk As shown in FIG. 1, the desk 6 has a tabletop 61, two legs 62, and two support bases 63. The tabletop 61 is formed in a rectangular plate shape when viewed in a plan view along the vertical direction. One of the two legs 62 protrudes downward from near the right end of the tabletop 61, and the other protrudes downward from near the left end of the tabletop 61. The two support bases 63 correspond one-to-one to the two legs 62. Each support base 63 is connected to the lower end of the corresponding leg 62 and supports the leg 62.

[0028] (2.3) Duct Fixtures As shown in FIG. 1, the duct fixing device F1 has a first fixing portion 1 and two second fixing portions 2.

[0029] The first fixing part 1 fixes the DC duct 3. The first fixing part 1 has a rod-like shape that is long in the left-right direction. More specifically, the first fixing part 1 of the first embodiment has a rectangular parallelepiped shape. The first fixing part 1 has a storage groove 11.

[0030] The storage groove 11 is formed along the left-right direction. The storage groove 11 stores the DC duct 3. In the example of Fig. 1, the storage groove 11 is formed so as to open toward the front.

[0031] One of the two second fixing portions 2 fixes one end (first end) of the first fixing portion 1 in the longitudinal direction to the desk 6, and the other of the two second fixing portions 2 fixes the other end (second end) of the first fixing portion 1 in the longitudinal direction to the desk 6. As shown in FIG. 1 , the two second fixing portions 2 of the first embodiment are fixed to the desk 6 by a clamp mechanism. In the following description, when there is no need to distinguish between the two second fixing portions 2, each of the two second fixing portions 2 may be referred to as the "second fixing portion 2." The second fixing portion 2 is a component (fixing member) for fixing the DC duct 3 to the desk 6. More specifically, the two second fixing portions 2 are used together with the first fixing portion 1 to fix the DC duct 3 to the desk 6.

[0032] (2.4) DC Duct As shown in FIG. 2, the DC duct 3 includes a duct body 31, a first conductive bar 32, and a second conductive bar 33.

[0033] The duct body 31 has a rectangular cylindrical shape. More specifically, in the example of Fig. 2, the duct body 31 has an open front. The cross section of the duct body 31 perpendicular to the left-right direction has a U-shape.

[0034] The first conductive bar 32 and the second conductive bar 33 are provided across the duct body 31 from the right end to the left end. The first conductive bar 32 in the first embodiment is provided on the inside of the upper surface of the duct body 31. The second conductive bar 33 is provided on the inside of the lower surface of the duct body 31.

[0035] The first conductive bar 32 and the second conductive bar 33 are electrically connected to the AC adapter 4 (see FIG. 1) via a feed-in. In the first embodiment, the first conductive bar 32 and the second conductive bar 33 are electrically connected to the AC adapter 4 so that the first conductive bar 32 is on the positive side and the second conductive bar 33 is on the negative side. DC power is supplied to the first conductive bar 32 and the second conductive bar 33 from the AC adapter 4.

[0036] (2.5) AC adapter The AC adapter 4 (see FIG. 1) converts AC power supplied from, for example, a commercial power source into DC power. The AC adapter 4 is electrically connected to the first conductive bar 32 and the second conductive bar 33 via a feed-in. The AC adapter 4 supplies DC power to the first conductive bar 32 and the second conductive bar 33 via the feed-in.

[0037] (2.6) Power conversion equipment 2, the power converter 5 is configured to be detachable from the duct body 31 of the DC duct 3 that holds the first conductive bar 32 and the second conductive bar 33. DC power is supplied to the power converter 5 from the first conductive bar 32 and the second conductive bar 33.

[0038] The power conversion device 5 includes a housing 51 .

[0039] The housing 51 has a rectangular box shape. The housing 51 has a first socket 511 and a second socket 512. The first socket 511 in the first embodiment is a socket for a USB (Universal Serial Bus) A plug (Type-A). The second socket 512 in the first embodiment is a socket for a USB C plug (Type-C). That is, the first socket 511 and the second socket 512 have different standards. The first socket 511 and the second socket 512 have different sizes.

[0040] The first socket 511 and the second socket 512 are provided on a surface (connector mounting surface 501) opposite to the surface facing the DC duct 3. The first socket 511 and the second socket 512 are aligned in the vertical direction.

[0041] Electrical devices are connected to the first outlet 511 and the second outlet 512. The first outlet 511 and the second outlet 512 of the first embodiment are output units that supply DC power to the electrical devices.

[0042] As shown in FIG. 3, the power conversion device 5 includes a pair of primary side terminals 52a and 52b, a power supply unit 53, a detection unit 54, a pair of secondary side terminals 55a and 55b, and a capacitor C1.

[0043] The pair of primary side terminals 52a, 52b are terminals to which power is supplied from the first conductive bar 32 and the second conductive bar 33 of the DC duct 3. The primary side terminal 52a is connected to the first conductive bar 32, and the primary side terminal 52b is connected to the second conductive bar 33. Since the first conductive bar 32 is the positive side, the primary side terminal 52a is an upstream side (positive side) terminal. Furthermore, since the second conductive bar 33 is the negative side, the primary side terminal 52b is a downstream side (negative side) terminal. Note that when the power conversion device 5 is not attached to the DC duct 3, the primary side voltage between the pair of primary side terminals 52a, 52b is approximately 0 V.

[0044] The pair of secondary side terminals 55a, 55b are electrically connected to the first socket 511 and the second socket 512. The pair of secondary side terminals 55a, 55b are terminals for supplying the secondary side voltage output by the power supply unit 53 to an electric device.

[0045] The power supply unit 53 converts the primary voltage applied between the pair of primary terminals 52a, 52b into a secondary voltage of a predetermined voltage value and outputs it to the pair of secondary terminals 55a, 55b. Furthermore, the power supply unit 53 stops outputting the secondary voltage based on the fluctuation of the primary voltage detected by the detection unit 54.

[0046] The power supply unit 53 is, for example, a step-down DC / DC converter. For example, the power supply unit 53 includes a switching power supply circuit or a linear power supply circuit. Note that the power supply unit 53 may be a step-up DC / DC converter or an AC / DC converter.

[0047] The power supply unit 53 of the first embodiment is configured to be able to receive, from the detection unit 54, a signal for controlling the on / off of the operation of the power supply unit 53. Since the power supply unit 53 does not need to determine whether or not to stop the output of the secondary side voltage based on the fluctuation in the primary side voltage detected by the detection unit 54, the configuration of the power supply unit 53 can be prevented from becoming complicated.

[0048] The capacitor C1 has a first end T1 connected to the primary side terminal 52a and a second end T2 connected to the primary side terminal 52b. The capacitor C1 of the first embodiment functions as an input capacitor for the power supply unit 53. The capacitor C1 is, for example, a ceramic capacitor. The capacitor C1 may be a part of the power supply unit 53.

[0049] The detection unit 54 detects the primary voltage applied between the pair of primary terminals 52 a, 52 b. Based on the fluctuation in the primary voltage detected by the detection unit 54, the detection unit 54 in the first embodiment outputs an operation-off signal to the power supply unit 53 to stop the output of the secondary voltage.

[0050] The detection unit 54 of the first embodiment stops outputting the secondary-side voltage when the detected primary-side voltage is equal to or lower than the off-threshold value. In other words, the power supply unit 53 stops outputting the secondary-side voltage when the primary-side voltage detected by the detection unit 54 is equal to or lower than the off-threshold value. For example, by detecting a voltage drop that occurs when the power conversion device 5 is removed and stopping the output of the secondary-side voltage, it is possible to prevent arcing from occurring when the power conversion device 5 is removed.

[0051] (3) Variations The first embodiment is merely one example of various embodiments of the present disclosure, and various modifications can be made to the first embodiment depending on the design and the like as long as the object of the present disclosure can be achieved.

[0052] Furthermore, functions equivalent to those of the power conversion device 5 according to the first embodiment may be embodied as an output stopping method, a (computer) program, a non-transitory recording medium on which a program is recorded, or the like. An output stopping method according to one aspect is a method used in a power conversion device 5 including a pair of primary-side terminals 52a, 52b and a pair of secondary-side terminals 55a, 55b. The output stopping method includes a conversion step, a detection step, and an output stopping step. In the conversion step, a primary-side voltage applied between the pair of primary-side terminals 52, 52b is converted into a secondary-side voltage of a predetermined voltage value and output to the pair of secondary-side terminals 55a, 55b. In the detection step, the primary-side voltage is detected. In the output stopping step, output of the secondary-side voltage is stopped based on the fluctuation in the primary-side voltage detected in the detection step. A program according to one aspect is a program for causing one or more processors to execute the above output method.

[0053] The power conversion device 5 or the output stopping method according to the present disclosure includes a computer system. The computer system is primarily composed of a processor and memory as hardware. The processor executes a program stored in the memory of the computer system to realize the functions of the power conversion device 5 or the output stopping method according to the present disclosure. The program may be pre-stored in the memory of the computer system, provided via a telecommunications line, or provided in a non-transitory recording medium readable by the computer system, such as a memory card, an optical disk, or a hard disk drive. The processor of the computer system is composed of one or more electronic circuits including a semiconductor integrated circuit (IC) or a large-scale integrated circuit (LSI). The integrated circuits, such as ICs and LSIs, are referred to by different names depending on the degree of integration, and include integrated circuits called system LSIs, very large-scale integrations (VLSIs), or ultra-large-scale integrations (ULSIs). Furthermore, field-programmable gate arrays (FPGAs), which are programmed after the LSI is manufactured, or logic devices capable of reconfiguring the connections within the LSI or the circuit partitions within the LSI, can also be used as processors. The electronic circuits may be integrated into one chip or distributed across multiple chips. The chips may be integrated into one device or distributed across multiple devices. The computer system referred to here includes a microcontroller having one or more processors and one or more memories. Therefore, the microcontroller is also composed of one or more electronic circuits including a semiconductor integrated circuit or a large-scale integrated circuit.

[0054] The detection unit 54 may stop the output of the secondary-side voltage when the gradient of the fluctuation in the primary-side voltage detected by the detection unit 54 is equal to or greater than the gradient threshold. In other words, the power supply unit 53 may stop the output of the secondary-side voltage when the gradient of the fluctuation in the primary-side voltage detected by the detection unit 54 is equal to or greater than the gradient threshold. For example, by detecting a sudden voltage drop (fluctuation) that occurs when the power conversion device 5 is removed and stopping the output of the secondary-side voltage, it is possible to prevent arcing from occurring when the power conversion device 5 is removed.

[0055] (Embodiment 2) As shown in FIG. 4, the power converter 5 according to the second embodiment differs from the power converter 5 according to the first embodiment in that it further includes a removal switch SW1.

[0056] The detachment switch SW1 of the second embodiment is provided between the pair of primary-side terminals 52a, 52b and the pair of secondary-side terminals 55a, 55b. More specifically, the detachment switch SW1 is provided between the primary-side terminal 52a and the first terminal T1 of the capacitor C1. The detachment switch SW1 switches between on and off based on a control signal output from the detection unit 54.

[0057] The removal switch SW1 is a semiconductor switch element such as a MOSFET (Metal Oxide Semiconductor Field Effect Transistor).In addition to a MOSFET, the removal switch SW1 may be another semiconductor switching element such as a bipolar transistor, an electromagnetic relay, or an SSR (Solid State Relay).

[0058] The detection unit 54 of the second embodiment switches the removal switch SW1 from on (conductive state) to off (non-conductive state) based on the fluctuation of the primary side voltage detected by the detection unit 54. Specifically, the detection unit 54 of the second embodiment switches the removal switch SW1 from on to off when the primary side voltage detected by the detection unit 54 is equal to or lower than the off threshold.

[0059] The detection unit 54 detects a voltage drop in the primary side voltage, for example, when the power conversion device 5 is removed from the DC duct 3, and switches the removal switch SW1 from on to off, thereby further suppressing arcs that occur when the power conversion device 5 is removed. In addition, the detection unit 54 detects a voltage rise in the primary side voltage, for example, when the power conversion device 5 is attached to the DC duct 3, and switches the removal switch SW1 from on to off, thereby further suppressing arcs that occur when the power conversion device 5 is attached.

[0060] Furthermore, since the removal switch SW1 of the second embodiment is provided between the primary side terminal 52a and the first end T1 of the capacitor C1, it is possible to suppress the occurrence of arcs, one of the causes of which is the capacitor C1.

[0061] It should be noted that the power supply unit 53 of the second embodiment stops outputting the secondary side voltage when the removal switch SW1 is turned from on to off.

[0062] The second embodiment is merely one example of various embodiments of the present disclosure, and various modifications can be made to the second embodiment depending on the design and the like, as long as the object of the present disclosure can be achieved.

[0063] The removal switch SW1 may be provided between the primary-side terminal 52b and the second end T2 of the capacitor C1. That is, the removal switch SW1 may be provided on the upstream side (positive side) or the downstream side (negative side). The removal switch SW1 may be provided between the capacitor C1 and the power supply unit 53, or on the secondary side of the power supply unit 53.

[0064] The detection unit 54 may turn the removal switch SW1 from on to off when the gradient of the fluctuation in the primary side voltage detected by the detection unit 54 is equal to or greater than a gradient threshold. For example, by detecting a sudden voltage drop (fluctuation) that occurs when the power conversion device 5 is removed and turning the removal switch SW1 from on to off, it is possible to prevent arcing from occurring when the power conversion device 5 is removed.

[0065] The various configurations (including modified examples) described in the second embodiment can be adopted in appropriate combination with the various configurations (including modified examples) described in the first embodiment.

[0066] (Embodiment 3) As shown in FIG. 5, the power converter 5 according to the third embodiment differs from the power converter 5 according to the first embodiment in that it further includes an attachment switch SW2.

[0067] The installation switch SW2 is provided between the primary terminal 52a and the first end T1 of the capacitor C1. In other words, the installation switch SW2 is provided between the upstream terminal of the pair of primary terminals 52a and the first end T1 of the capacitor C1. The installation switch SW2 switches between on and off based on a control signal output from the detection unit 54.

[0068] The installation switch SW2 is a semiconductor switching element such as a MOSFET, etc. The installation switch SW2 may be a semiconductor switching element other than a MOSFET, such as a bipolar transistor, an electromagnetic relay, or an SSR (Solid State Relay).

[0069] The detection unit 54 of the third embodiment switches the installation switch SW2 from OFF (non-conductive state) to ON (conductive state) based on a fluctuation in the primary-side voltage detected by the detection unit 54. More specifically, the detection unit 54 switches the installation switch SW2 from OFF to ON when the primary-side voltage detected by the detection unit 54 becomes equal to or greater than the ON threshold. The ON threshold is, for example, a value greater than the OFF threshold. The primary-side voltage becomes equal to or greater than the ON threshold after, for example, attaching the power conversion device 5 to the DC duct 3. Note that when the primary-side voltage detected by the detection unit 54 is less than the ON threshold, the installation switch SW2 remains OFF.

[0070] The detection unit 54 turns the installation switch SW2 from off to on based on a fluctuation in the primary side voltage, thereby suppressing the generation of an arc due to an inrush current when the power conversion device 5 is installed in the DC duct 3. Specifically, the installation switch SW2 is off until the primary side voltage becomes equal to or higher than the on threshold, so that the generation of an arc due to an inrush current when the power conversion device 5 is installed in the DC duct 3 can be suppressed.

[0071] In addition, since the installation switch SW2 is provided between the upstream terminal of the pair of primary side terminals 52a and the first end T1 of the capacitor C1, when a DC voltage is applied between the pair of primary side terminals 52a, 52b, it is possible to suppress the occurrence of an arc due to an inrush current.

[0072] The third embodiment is merely one example of various embodiments of the present disclosure, and various modifications can be made to the third embodiment depending on the design and the like as long as the object of the present disclosure can be achieved.

[0073] The detection unit 54 may switch the installation switch SW2 from off to on when a predetermined time has elapsed since the primary-side voltage detected by the detection unit 54 became equal to or greater than a detection threshold. The detection threshold is, for example, a voltage value greater than 0 V and less than an on-threshold. The primary-side voltage becomes equal to or greater than the detection threshold when, for example, the primary-side terminal 52a and the first conductive bar 32 come into contact with each other when the power conversion device 5 is being installed in the DC duct 3. The predetermined time is, for example, about 10 seconds to 1 minute. By switching on the installation switch SW2 after the installation of the power conversion device 5 is complete, it is possible to suppress the generation of an arc due to an inrush current.

[0074] The power converter 5 may include a removal switch SW1 and an attachment switch SW2.

[0075] The installation switch SW2 may have the function of the removal switch SW1. That is, after the power conversion device 5 is installed in the DC duct 3 and the installation switch SW2 is turned on, the detection unit 54 may change the installation switch SW2 from on to off based on a fluctuation in the primary side voltage detected by the detection unit 54.

[0076] 6, the power conversion device 5 may further include a diode D1. The diode D1 has an anode connected to the primary side terminal 52a and a cathode connected to the installation switch SW2. In other words, the diode D1 has an anode connected to the primary side terminal 52a and a cathode connected to the first end T1 of the capacitor C1. By including the diode D1 in the power conversion device 5, it is possible to prevent arcing from occurring when the power conversion device 5 is attached or detached, even when an AC voltage is applied to the pair of primary side terminals 52a, 52b.

[0077] The various configurations (including modified examples) described in the third embodiment can be adopted in appropriate combination with the various configurations (including modified examples) described in the first and second embodiments.

[0078] (summary) As described above, the power conversion device (5) according to the first aspect includes the power supply unit (53) and the detection unit (54). The power supply unit (53) converts a primary voltage applied across a pair of primary terminals (52a, 52b) into a secondary voltage of a predetermined voltage value and outputs the secondary voltage to a pair of secondary terminals (55a, 55b). The detection unit (54) detects the primary voltage. The power supply unit (53) stops outputting the secondary voltage based on the fluctuation in the primary voltage detected by the detection unit (54).

[0079] According to this aspect, the generation of an arc can be suppressed by stopping the output of the secondary voltage based on a fluctuation in the primary voltage, such as a drop in the primary voltage.

[0080] In the power conversion device (5) according to the second aspect, in the first aspect, the power supply unit (53) stops outputting the secondary side voltage when the primary side voltage detected by the detection unit (54) is equal to or lower than the off threshold.

[0081] According to this aspect, for example, by detecting a voltage drop that occurs when the power conversion device (5) is removed and stopping the output of the secondary voltage, it is possible to prevent arcing from occurring when the power conversion device (5) is removed.

[0082] In the power conversion device (5) according to the third aspect, in the first or second aspect, the power supply unit (53) stops outputting the secondary side voltage when the gradient of the fluctuation in the primary side voltage detected by the detection unit (54) is equal to or greater than a gradient threshold value.

[0083] According to this aspect, by detecting a sudden voltage fluctuation that occurs when the power conversion device (5) is attached or detached (inserted or removed) and stopping the output of the secondary side voltage, it is possible to prevent arcing from occurring when the power conversion device (5) is attached or detached.

[0084] The power conversion device (5) according to a fourth aspect is the power conversion device (5) of any one of the first to third aspects, further including a removal switch (SW1). The removal switch (SW1) is provided between the pair of primary side terminals (52a, 52b) and the pair of secondary side terminals (55a, 55b). The detection unit (54) switches the removal switch (SW1) from on to off based on a fluctuation in the primary side voltage detected by the detection unit (54).

[0085] According to this aspect, the detection unit (54) switches the removal switch (SW1) from on to off based on the fluctuation in the primary side voltage detected by the detection unit (54), thereby making it possible to further suppress the occurrence of arcs when attaching or detaching the power conversion device (5).

[0086] The power conversion device (5) according to a fifth aspect is the fourth aspect, and further includes a capacitor (C1) having a first end (T1) connected to one (primary terminal 52a) of a pair of primary side terminals (52a, 52b) and a second end (T2) connected to the other (primary terminal 52b) of the pair of primary side terminals (52a, 52b). The removal switch (SW1) is provided between one of the pair of primary side terminals (52a, 52b) and the first end (T1) of the capacitor (C1).

[0087] According to this aspect, the removal switch (SW1) is provided between the pair of primary side terminals (52a, 52b) and the first end (T1) of the capacitor (C1), thereby making it possible to further suppress the occurrence of an arc when the power conversion device (5) is attached or detached.

[0088] A power converter (5) according to a sixth aspect is any of the first to fifth aspects, wherein the pair of primary terminals (52a, 52b) includes an upstream terminal (primary terminal 52a) and a downstream terminal (primary terminal 52b). The power converter (5) further includes a capacitor (C1) and a diode (D1). The capacitor (C1) has a first end (T1) connected to the upstream terminal and a second end (T2) connected to the downstream terminal. The diode (D1) has an anode connected to the upstream terminal and a cathode connected to the first end (T1) of the capacitor (C1).

[0089] According to this aspect, even when an AC voltage is applied to the pair of primary terminals (52a, 52b), for example, it is possible to prevent arcing from occurring when the power converter (5) is attached or detached.

[0090] In the power conversion device (5) according to a seventh aspect, in any one of the first to sixth aspects, the power supply unit (53) can receive a signal for controlling on / off of the operation of the power supply unit (53). The detection unit (54) outputs an operation-off signal to the power supply unit (53) based on a fluctuation in the primary-side voltage detected by the detection unit (54), thereby stopping the output of the secondary-side voltage.

[0091] According to this aspect, the power supply unit (53) does not need to determine whether to stop output of the secondary voltage based on the fluctuation in the primary voltage detected by the detection unit (54), which prevents the configuration of the power supply unit (53) from becoming complicated.

[0092] The power conversion device (5) according to an eighth aspect is the power conversion device (5) of any one of the first to seventh aspects, further including a capacitor (C1) and an installation switch (SW2). The capacitor (C1) has a first end (T1) connected to one (primary terminal 52a) of the pair of primary side terminals (52a, 52b) and a second end (T2) connected to the other (primary terminal 52b) of the pair of primary side terminals (52a, 52b). The installation switch (SW2) is provided between one of the pair of primary side terminals (52a, 52b) and the first end (T1) of the capacitor (C1). The detection unit (54) switches the installation switch (SW2) from off to on based on a fluctuation in the primary side voltage detected by the detection unit (54).

[0093] According to this aspect, it is possible to suppress the occurrence of arcs due to inrush current when installing the power converter (5), for example.

[0094] The power conversion device (5) according to a ninth aspect is the eighth aspect, wherein the detection unit (54) changes the attachment switch (SW2) from off to on when the primary side voltage detected by the detection unit (54) becomes equal to or higher than the on threshold.

[0095] According to this aspect, for example, by turning on the installation switch (SW2) after the installation of the power conversion device (5) is completed, it is possible to suppress the generation of an arc due to an inrush current.

[0096] In the power conversion device (5) according to a tenth aspect, in the eighth aspect, the detection unit (54) changes the mounting switch (SW2) from off to on when a predetermined time has elapsed since the primary side voltage detected by the detection unit (54) became equal to or greater than a detection threshold.

[0097] According to this aspect, for example, by turning on the installation switch (SW2) after the installation of the power conversion device (5) is completed, it is possible to suppress the generation of an arc due to an inrush current.

[0098] The power conversion device (5) according to the eleventh aspect is any one of the eighth to tenth aspects, in which one of the pair of primary side terminals (52a, 52b) (primary side terminal 52a) is an upstream terminal and the other of the pair of primary side terminals (52a, 52b) (primary side terminal 52b) is a downstream terminal.

[0099] According to this aspect, when a DC voltage is applied between the pair of primary side terminals (52a, 52b), for example, it is possible to suppress the occurrence of an arc due to an inrush current.

[0100] The power converter (5) according to a twelfth aspect is configured to be detachable from the DC duct (3) that holds the first conductive bar (32) and the second conductive bar (33) in any one of the first to eleventh aspects. One of the pair of primary side terminals (52a, 52b) (primary side terminal 52a) is connected to the first conductive bar (32), and the other of the pair of primary side terminals (52a, 52b) (primary side terminal 52b) is connected to the second conductive bar (33).

[0101] According to this embodiment, it is possible to prevent arcing from occurring when the power converter (5) is attached to or detached from the DC duct (3).

[0102] The configurations other than those of the first aspect are not essential for the power converter (5) and can be omitted as appropriate. [Explanation of symbols]

[0103] 3 DC duct 32 First conductive bar 33 Second conductive bar 5 Power conversion device 52a Primary side terminal (upstream terminal) 52b Primary terminal (downstream terminal) 53 Power supply section 54 Detection unit 55a Secondary terminal 55b Secondary terminal C1 capacitor D1 Diode SW1 Removal switch SW2 Installation switch T1 1st end T2 2nd end

Claims

1. A power conversion device configured to be detachable from a DC duct that holds a first conductive bar and a second conductive bar, a power supply unit that converts a primary voltage applied between a pair of primary terminals into a secondary voltage of a predetermined voltage value and outputs the secondary voltage to the pair of secondary terminals; a detection unit that detects the primary side voltage; Equipped with The power supply unit stopping the output of the secondary voltage based on the fluctuation of the primary voltage detected by the detection unit; A signal for controlling the on / off operation of the power supply unit can be received, the detection unit outputs an operation-off signal to the power supply unit based on the fluctuation in the primary-side voltage detected by the detection unit, thereby stopping the output of the secondary-side voltage. Power conversion device.

2. the power supply unit stops outputting the secondary voltage when the primary voltage detected by the detection unit is equal to or lower than an off threshold. The power conversion device according to claim 1 .

3. the power supply unit stops outputting the secondary side voltage when an absolute value of a negative gradient of the fluctuation of the primary side voltage detected by the detection unit is equal to or greater than a gradient threshold value. The power conversion device according to claim 1 or 2.

4. a removal switch provided between the pair of primary terminals and the pair of secondary terminals, the detection unit switches the removal switch from on to off based on the fluctuation in the primary side voltage detected by the detection unit. The power conversion device according to any one of claims 1 to 3.

5. a capacitor having a first end connected to one of the pair of primary terminals and a second end connected to the other of the pair of primary terminals, the removal switch is provided between the one of the pair of primary side terminals and the first end of the capacitor. The power conversion device according to claim 4.

6. the pair of primary terminals includes an upstream terminal and a downstream terminal, a capacitor having a first end connected to the upstream terminal and a second end connected to the downstream terminal; a diode having an anode connected to the upstream terminal and a cathode connected to the first end of the capacitor; Further comprising: The power conversion device according to any one of claims 1 to 5.

7. A capacitor having a first end connected to one side of the pair of primary side terminals and a second end connected to the other side of the pair of primary side terminals; an installation switch provided between the one of the pair of primary side terminals and the first end of the capacitor; Further provided with The detection unit changes the attachment switch from off to on based on the fluctuation in the primary side voltage detected by the detection unit. The power conversion device according to any one of claims 1 to 6.

8. The detection unit changes the installation switch from off to on when the primary side voltage detected by the detection unit becomes equal to or higher than an on threshold. The power conversion device according to claim 7.

9. The detection unit changes the installation switch from off to on when a predetermined time has elapsed since the primary side voltage detected by the detection unit became equal to or greater than a detection threshold. The power conversion device according to claim 7.

10. One of the pair of primary side terminals is an upstream terminal, and the other of the pair of primary side terminals is a downstream terminal. The power conversion device according to any one of claims 7 to 9.

11. One of the pair of primary side terminals is connected to the first conductive bar, and the other of the pair of primary side terminals is connected to the second conductive bar. The power conversion device according to any one of claims 1 to 10.

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