POWER CONVERSION DEVICE

Abstract

Power conversion device which features: a housing (101, 101A, 101B) containing a DC connector (103) and an AC input (102); a first power conversion circuit (115, 145) housed in the casing; and an isolating circuit (114, 144) and an interrupter, which are housed in the casing; wherein the DC connector (103) can be connected to a DC power input (210) of a vehicle (200), the AC input (102) can be connected to a connector (323) of a cable for AC power (320), the first power conversion circuit (115, 145) is arranged between the AC input and the DC connector and is designed to convert AC power input from the AC input side into DC power and output the DC power to the DC connector side, the isolation circuit (114, 144) is arranged between the AC input and the DC connector, The interrupter is designed to interrupt a current between the AC input and the DC connector when the interrupter detects an abnormality in the current between the AC input and the DC connector, and at one end of the housing on the side of the AC input (102) includes a skirt section (104) which projects around a connecting surface (F1) of the AC input (102), wherein the connecting surface (F1) of the AC input (102) is surrounded by the skirt section (104).

Description

[0001] This non-provisional application is based on Japanese patent application no. 2018-209578 filed with the Japan Patent Office on November 7, 2018, the contents of which are hereby incorporated by reference. Background area

[0002] The present invention relates to a power conversion device. Description of the state of the art

[0003] In recent years, with a view to environmental protection, electrically powered vehicles (such as electric vehicles or plug-in hybrid vehicles), which are primarily powered by electrical energy or power, have become increasingly common. Such vehicles have an input designed to receive electrical power or energy supplied by a power supply unit and to charge a vehicle-mounted battery with the electrical power received through the input. When a connector or plug of a charging cable from the power supply unit is connected to the vehicle's input, electrical power or energy can be supplied to the vehicle's input from the power supply unit via the charging cable.

[0004] An AC power supply method (hereinafter referred to as the "AC method") and a DC power supply method (hereinafter referred to as the "DC method") are known as the primary power supply methods. A standard charger and a fast charger are known as the primary power supply devices. The AC method is used in the standard charger, and the DC method is used in the fast charger.

[0005] The DC charging method is further subdivided into several emerging DC charging methods, such as CHAdeMO, CCS (Combined Charging System), GB / T, and Tesla. These DC charging methods necessarily require a unified charging protocol. Therefore, JP 2016-521106 A proposes an intermediate protocol adapter (CHAdeMO / Tesla adapter) to be connected to a DC power cable (hereinafter referred to as the "DC cable") of a fast charger.

[0006] DE 10 2011 107 628 A1 discloses a power conversion device comprising: a housing containing a DC connector and an AC input; and a first power conversion circuit housed in the housing, wherein the DC connector is connectable to a DC power input of a vehicle, the AC input is connectable to a connector of a cable for AC power, and the first power conversion circuit is arranged between the AC input and the DC connector and is designed to convert AC power input from the AC input side into DC power and output the DC power to the DC connector side.

[0007] WO 2015 / 067 694 A1 discloses a power conversion device configured for AC-DC conversion. The power conversion device can be portable and integrated into a housing.

[0008] The subsequently published DE 10 2018 216 390 A1 discloses a device for charging an energy storage device of a vehicle, wherein the device comprises a housing with an AC / DC converter and a connection contact for connecting to a vehicle.

[0009] The subsequently published DE 10 2018 217 295 A1 discloses a charging cable with a DC-side interface configured for AC-DC conversion, wherein the DC-side interface is an IEC 62196 connector.

[0010] DE 10 2015 226 673 A1 discloses a DC / AC converter coupled with an energy storage device.

[0011] The subsequently published DE 10 2019 216 325 A1 and DE 10 2019 216 468 A1 disclose power conversion devices of the applicant of the present disclosure, which are functionally similar to the power conversion device of the present disclosure.

[0012] DE 11 2016 002 475 T5 describes a power conversion device, which is set up for AC / DC power conversion, in functional terms. Summary

[0013] A standard battery charger uses an AC power cable (hereinafter referred to as the "AC cable"). When a connector of the AC cable, which is attached to the standard charger, is connected to an AC power input (hereinafter referred to as the "AC input") of a vehicle, AC power can be supplied to the vehicle's AC input from the standard charger via the AC cable. Generally, the standard battery charger is considered a power supply device for a vehicle that has an AC power input. Therefore, if a vehicle does not have an AC input, it is difficult to charge a vehicle-mounted battery using a standard battery charger. The widespread use of vehicles that only have a DC power input (hereinafter referred to as the "DC input") is expected in the future. Hereinafter, a vehicle that only has a DC input will be referred to as a "DC-bound vehicle."If, in such a case, a normal charger cannot be used in a DC-connected vehicle, not only is the convenience for a user of the DC-connected vehicle lost, but the effective use of the existing normal charger (charging infrastructure) may also become impossible.

[0014] The present invention arose to solve the above problem, and it is an object of the present invention to provide a power conversion device which has high strength or durability and is designed to enable a vehicle which contains only a DC input to be supplied with electrical power or energy from an AC power supply device.

[0015] This problem is solved by a power conversion device according to claim 1.

[0016] A power conversion device according to the present invention comprises: a housing containing a DC connector and an AC input; and a first power conversion circuit housed within the housing. The DC connector is connectable to a DC power input of a vehicle. The AC input is connected to a cable connector for AC power. The first power conversion circuit is arranged between the AC input and the DC connector and is designed to convert AC energy or AC power input from the AC input into DC power or DC energy and to output the DC power to the DC connector.

[0017] Using the power conversion device, the AC power supplied by an AC power supply unit can be converted into DC power, which can then be supplied to the vehicle. Therefore, according to the power conversion device, a vehicle with only a DC input can receive electrical power from an AC power supply unit. Furthermore, the DC connector, the AC input, and the first power conversion circuit are all housed in a single enclosure, thus integrating these components. This results in improved robustness and durability of the power conversion device.

[0018] For example, if the first power conversion circuit and the DC connector are housed in separate enclosures, and the enclosure of the first power conversion circuit is connected to the enclosure of the DC connector via a flexible cable, mechanical stress will likely be exerted on the flexible cable due to the weight of the first power conversion circuit. Torsion is also likely to occur in such a flexible cable. If the enclosure of the first power conversion circuit is located on the ground to support its weight, the first power conversion circuit could potentially be submerged in water.

[0019] In contrast, the DC connector, AC input, and first power conversion circuit are integrated into the power conversion device. Therefore, the entire power conversion device can be supported by the vehicle by connecting its DC connector to the vehicle's DC input. This reduces mechanical stress compared to the previously described case using a flexible cable, thus improving the strength and durability of the power conversion device. Furthermore, such a power conversion device can be easily mounted higher than ground, thus preventing its immersion in water.

[0020] The power conversion device can also be designed such that the AC input is located below the DC connector and above an earth contact surface of the vehicle when the DC connector is connected to the vehicle's DC power input.

[0021] In the power conversion device, the AC input is located below the DC connector, thus directly connecting the AC cable connector to the AC input. This is because the AC cable is frequently used in a grounded position. Furthermore, in the power conversion device, the DC connector and the AC input are positioned above the vehicle's grounding surface, effectively preventing the power conversion device from being submerged in water.

[0022] The power conversion device can be designed such that the AC input connection surface is inclined relative to the mounting surface between the DC connector and the DC power input when the DC connector is installed in the DC power input. With such a configuration, a user can easily see the AC input connection surface.

[0023] The housing (i.e., the housing in which the DC connector, AC input, and first power conversion circuit are integrated) of the power conversion device can be carried by the vehicle in a state suspended relative to the ground when the DC connector is connected to the DC power input.

[0024] Since the power conversion device is supported solely by the vehicle, it can be used without being located on the ground. Therefore, immersion of the power conversion device in water can be easily avoided.

[0025] In the power conversion device according to the invention, one end of the housing on the AC input side includes a skirt section or collar section that projects around a connecting surface of the AC input. The connecting surface of the AC input is surrounded by the skirt section.

[0026] Since the skirt section is arranged around the connection surface of the AC entrance, the connection surface of the AC entrance is not simply affected by rain, snow and wind (and also by a foreign object blown in by the wind).

[0027] The housing of the power conversion device can include a roof element for the AC input connection. Such a roof element can serve as protection against rain. By providing the roof element, the AC input connection is not simply soaked by rain. The skirt section can serve as the roof element.

[0028] An isolating circuit and a circuit breaker, described below, are also housed within the enclosure. The isolating circuit is located between the AC input and the DC connector. The circuit breaker is designed to interrupt the current between the AC input and the DC connector when it detects an abnormal current between these two components.

[0029] According to the configuration described above, the current is interrupted by the circuit breaker when an abnormality of the current (for example, leakage current or overcurrent) occurs, and thus a circuit on the power receiving side can be protected.

[0030] In the power conversion device, the first power conversion circuit can be arranged on the DC connector side with respect to the isolating circuit. The circuit can include: a first switch designed to conduct and interrupt current between the isolating circuit and the DC connector; a first current sensor designed to detect current flowing between the first power conversion circuit and the DC connector; and a first controller designed to control the first switch. The first controller can be designed to open the first switch to interrupt the current when the first current sensor detects an abnormal current while electrical power is being input into the AC input.

[0031] In the power conversion device, a circuit on the AC input side and a circuit on the DC connector side are electrically isolated from each other by an isolating circuit. Therefore, even if an overcurrent occurs in the circuit on the AC input side with respect to the isolating circuit, no overcurrent flows into the circuit on the DC connector side with respect to the isolating circuit. Furthermore, the first control circuit of the circuit breaker opens the first switch to interrupt the current when the current abnormality is detected by the first current sensor while electrical power is being input to the AC input.If, according to the interrupter, an abnormal current occurs while electrical power is being input to the AC input (for example, while the vehicle is receiving electrical power from the AC power supply unit through the power conversion device), the circuit on the power receiving side (for example, the electronic circuit of the vehicle) can therefore be appropriately protected.

[0032] A second power conversion circuit, designed to perform a predetermined power conversion, may also be housed within the enclosure. This second power conversion circuit may be positioned between the AC input and the isolating circuit. The circuit breaker may include: a second switch designed to conduct and interrupt current between the AC input and the isolating circuit; a second current sensor designed to detect current flowing between the second power conversion circuit and the AC input; and a second controller designed to control the second switch. The second controller may be designed to open the second switch to interrupt the current when the current abnormality is detected by the second current sensor while electrical power is being input into the DC connector.

[0033] In the power conversion device, the circuit on the AC input side and the circuit on the DC connector side are electrically isolated from each other by the isolating circuit. Therefore, even if an overcurrent occurs in the circuit on the DC connector side with respect to the isolating circuit, no overcurrent flows into the circuit on the AC input side with respect to the isolating circuit. Furthermore, the second control circuit of the circuit breaker opens the second switch to interrupt the current when the current abnormality is detected by the second current sensor while electrical power is being input into the DC connector.If the current abnormality occurs while electrical power is being input into the DC connector (for example, while electrical power is being supplied from the vehicle through the power conversion device), the circuit on the power receiving side (for example, an electrical load outside the vehicle that receives power or energy supplied by the vehicle) can therefore be appropriately protected by the interrupter.

[0034] In the interrupter, which contains the first switch, the second switch, the first control designed to control the first switch, and the second control designed to control the second switch, the first control designed to control the first switch and the second control designed to control the second switch can be two separate control units or a common control unit (i.e., a single control unit designed to control both the first and second switches).

[0035] The first power conversion circuit can be designed to convert DC power input from the DC connector side into AC power and output the AC power to the AC input side.

[0036] The first power conversion circuit can perform bidirectional power conversion. According to the power conversion device, which includes the first power conversion circuit described above, not only can DC power be supplied to the vehicle from the AC power supply unit via the power conversion device, but AC power can also be supplied from the vehicle to the outside of the vehicle via the power conversion device.

[0037] The above and further tasks, features, aspects and advantages of the present invention will become clear with reference to the following detailed description of the present invention and the accompanying drawings. Brief description of the drawings Fig. Figure 1 is an overall configuration diagram of an energy supply system according to a first embodiment of the present invention. Fig. Figure 2 shows an appearance of a charging cable that is used in the energy supply system of the Fig. 1 is used. Fig. Figure 3 shows a state in which a power conversion device according to the first embodiment of the present invention is connected to a vehicle. Fig. Figure 4 shows a schematic external shape of a housing and a configuration (internal configuration) of the interior of the housing of the power conversion device according to the first embodiment of the present invention. Fig. Figure 5 shows a connection surface of an AC input of a first end of the housing of the power conversion device. Fig. 4. Fig. Figure 6 shows a connection surface of a DC connector at a second end of the housing of the power conversion device. Fig. 4. Fig. Figure 7 shows details of a power conversion circuit of the Fig. 4. Fig. Figure 8 is a diagram illustrating a problem that may occur in a power conversion device according to a comparative example. Fig. Figure 9 shows a configuration of a power conversion device according to a second embodiment of the present invention. Fig. Figure 10 shows details of the power conversion circuit of the Fig. 9. Fig. Figure 11 shows in the power conversion device according to the second embodiment of the present invention an end surface of a first end of a housing in which an AC input and an electrical output are exposed. Fig. Figure 12 shows an appearance of a power conversion device according to a first modification. Fig. Figure 13 shows a state in which the power conversion device of the Fig. 12 is connected to a vehicle. Fig. Figure 14 shows an appearance of a power conversion device according to a second modification. Fig. Figure 15 is a diagram illustrating a first modification of a roof element for the connection surface of the AC input. Fig. Figure 16 shows a state in which a lower lid is present in the example of the Fig. 15 is closed. Fig. Figure 17 is a diagram illustrating a second modification of the roof element for the AC input connection surface. Description of preferred embodiments

[0038] In the following, embodiments of the present invention are described in more detail with reference to the drawings, wherein the same or corresponding parts are designated by the same reference numerals and their description is not repeated. Hereinafter, an electronic control unit is abbreviated as "ECU". First embodiment

[0039] Fig. Figure 1 shows an overall configuration of an energy supply system according to a first embodiment of the present invention. Fig. 1 The energy supply system according to the present embodiment comprises a power conversion device 100, a vehicle 200 and an energy supply unit 300. The power conversion device 100 is designed to perform a power conversion between the vehicle 200 and the energy supply unit 300.

[0040] Vehicle 200 is a DC-powered vehicle. That is, Vehicle 200 does not contain an AC input. Vehicle 200 contains a DC power input (DC input) 210, a battery 240 (a vehicle-mounted battery), and a vehicle ECU 250. DC input 210 has terminals T51 to T53 and a terminal block T54. Terminals T51 and T52 are power terminals, and terminal T53 is a ground terminal. Terminal block T54 contains several signal terminals. Each signal terminal in terminal block T54 is connected to the vehicle ECU 250 via a signal line.

[0041] Electrical power or energy from an external power supply or current source (for example, a system power supply or system current source 311) is input to terminals T51 and T52 of the DC input 210 via the power conversion device 100. The electrical energy input to the DC input 210 is supplied to the battery 240. The DC input 210 also contains a circuit (a filter circuit not shown) designed to perform a predefined process with respect to the input electrical power or energy. As a result of the process performed by the circuit, the electrical power suitable for charging the battery 240 is output from the DC input 210 to the battery 250.The vehicle 200 can be an electric vehicle that can drive using only electrical energy stored in the battery 240, or it can be a hybrid vehicle that can drive using electrical energy stored in the battery 240 and an output from an internal combustion engine (not shown).

[0042] The power supply unit 300 is a power supply unit for the AC method. The power supply unit 300 includes a power supply device 310 and a charging cable 320. The power supply device 310 includes a system power supply 311 and an electrical output 312. The system power supply 311 is an AC power supply (for example, a single-phase AC power supply having a voltage of 100 V or 200 V) to which electrical energy or power is supplied from a power grid (for example, a power grid provided by an electricity company). The system power supply 311 is connected to the electrical output 312, with a wire breaker (not shown) interposed between them.The circuit breaker is designed to interrupt an electrical current path when an abnormal current flows due to an overload, a short circuit, or another factor, and to forcibly stop the electrical power supply from the system power supply 311 to the electrical output 312 (and the charging cable 320). The power supply device 310 can be a standard charger with an electrical output. The electrical output 312 can be an electrical outlet (for example, an external electrical box) located on the exterior wall of a building.

[0043] The charging cable 320 is a cable for AC power (AC cable) and is, for example, a general charging cable that is used when power is supplied according to the AC method. Fig. Figure 2 shows an appearance of a 320 charging cable. Fig. 2 The charging cable 320 contains a CCID box (CCID: charging circuit interrupt device) 321, a plug 322 and an AC connector 323.

[0044] According to Fig. 1. The connector 322 has terminals T11 to T13. When the connector 322 is connected to (inserted into) the electrical output 312 (connector receptacle), terminals T11, T12 and T13 of the connector 322 are electrically connected to a hot end (power supply end), a cold end (power return end) and a ground of the system power supply 311, respectively.

[0045] Relays 31a and 31b, a controller 32 designed to control relays 31a and 31b, and a CPLT circuit 33 are installed in the CCID box 321. The AC connector 323 has terminals T21 to T25. Terminals T21, T22, and T23 are each connected to terminals T11, T12, and T13 via electrical wires. However, relay 31a is located in the electrical wire connecting terminal T11 and terminal T21, and relay 31b is located in the electrical wire connecting terminal T12 and terminal T22. The electrical wire connecting terminal T13 and terminal T23 corresponds to an earth wire and ground wire, respectively, and terminal T23 corresponds to a ground connection. The CPLT circuit 33 is connected to terminal T24 via a signal wire.The signal line connecting CPLT circuit 33 and terminal T24 corresponds to a PISW signal line, and terminal T24 corresponds to a PISW signal terminal. Additionally, controller 32 is connected to terminal T25 via a signal line. The signal line connecting controller 32 and terminal T25 corresponds to a CPLT signal line, and terminal T25 corresponds to a CPLT signal terminal. A CPLT signal (CPLT: Controller Test Signal) and a PISW signal (PISW: Cable Connection Signal) are signals according to the SAE Electric Vehicle Conductive Charge Coupler standard.

[0046] The controller 32 is designed to communicate with another controller (for example, a controller of the power conversion device 100) via the CPLT signal in a state where the AC connector 323 is connected to an AC input (for example, an AC input of the power conversion device 100). The controller 32 can, for example, provide charging information using the CPLT signal, such as the connection status of a charging cable 320 and the current capacity of the charging cable 320. The controller 32 can also receive charging information (i.e., a message indicating whether an electrical power supply is possible) from the other controller using the CPLT signal. The controller 32 initially sets relays 31a and 31b to an open state (disconnect state).When the electrical energy supply is allowed, the control unit 32 puts the relays 31a and 31b into a closed state (conducting state).

[0047] The CPLT circuit 33 is configured such that the impedance of a signal path varies between a state in which the AC connector 323 is connected to the AC input (for example, the AC input of the power conversion device 100) and a state in which the AC connector 323 is not connected to the AC input. The CPLT circuit 33 outputs the PISW signal (i.e., a signal indicating whether the charging cable 320 is connected), generated using this impedance variation, to the controller 32. The controller 32 can determine the connection state (connected / disconnected) of the charging cable 320 based on the PISW signal input from the CPLT circuit 33.

[0048] Fig. Figure 3 shows a state in which the power conversion device 100 is connected to the vehicle 200. Fig. Figure 4 shows a schematic external shape of a housing and a configuration of the internal housing of the power conversion device 100. In each figure used below, the Z-axis, formed by an X-axis, a Y-axis, and a Z-axis that are orthogonal to each other, indicates a vertical direction. In the Z-axis, an arrow Z1 indicates a vertical upward direction, and an arrow Z2 indicates a vertical downward direction (direction of gravity). In the Y-axis, an arrow Y1 indicates a vehicle front.

[0049] With regard to the Fig. 3 and Fig. Figure 4 of the power conversion device 100 includes a housing 101 containing the AC input 102 and a DC connector 103. The housing 101 has an elongated external shape and features a first end E1 at one end and a second end E2 at the other. More precisely, the housing 101 has a cylindrical (i.e., circular) body section in which the X-axis is a longitudinal direction, and the first end E1 and the second end E2 are located at opposite ends of the body section. The housing 101 is made, for example, of resin. Resin has excellent insulating properties. Resins with high hardness, such as thermosetting resin or cross-laminated resin, are preferred. However, the material of the housing 101 is not limited to resin, and metal (for example, aluminum or an alloy thereof) can also be used.

[0050] The AC input 102 is located at the first end E1 of the housing 101 and is connected to the AC connector 323 of the charging cable 320 ( Fig. 1) connectable. The DC connector 103 is located at the second end E2 of the housing 101 and is connected to the DC input 210 of the vehicle 200 ( Fig. 1) Connectable. At least one of the AC input 102 and the DC connector 103 may have a locking mechanism (a latch) for securing them in a connected state and an operating or actuating device (for example, a release lever or a release button) for unlocking them. The AC input 102 may include a flap or cap designed to cover a connection surface F1 when not in use. The DC connector 103 may include a flap or cap designed to cover a connection surface F2 when not in use.

[0051] In the present embodiment, when the DC connector 103 is connected to the DC input 210, the housing 101 of the power conversion device 100 is supported by the vehicle 200. As shown in Fig. As shown in Figure 3, the housing 101 is supported by the vehicle 200, and the power conversion device 100 as a whole is thus supported solely by the vehicle 200. In a state where the DC connector 103 of the power conversion device 100 is connected to (attached to) the DC input 210 (hereinafter also referred to as the "DC connection state"), the AC input 102 and the DC connector 103 are located above (Z1 side) a ground contact surface (i.e., a ground surface F20) of the vehicle 200. The power conversion device 100 is supported by the vehicle 200 in a state suspended relative to the ground. Therefore, even if the ground surface F20 is wetted by rain or snow, immersion of the power conversion device 100 in water is unlikely to occur.

[0052] The connecting surfaces F1 and F2, which are in Fig. As shown in section 4, the surfaces of the housing 101 are exposed in such a way that external connections can be made to the connection surfaces F1 and F2. In the DC connection state of the power conversion device 100, which is shown in Fig. As shown in Figure 3, the connection surface F1 of the AC input 102 points in the direction of arrow X2, and the connection surface F2 of the DC connector 103 points in the direction of arrow X1. The direction indicated by arrow X1 corresponds to the side of the vehicle 200 from the perspective of the power conversion device 100 in the DC connection state.

[0053] The first end E1 of the housing 101 on the side of the AC input 102 contains a skirt section or collar section 104, which extends towards the outer end side (i.e., the X2 side in the DC connection state, which is in Fig. 3) protrudes around the connecting surface F1 of the AC input 102. The connecting surface F1 of the AC input 102 is surrounded by the skirt section 104 (see below). Fig. 5) Part of the skirt section 104 is arranged on the upper side (Z1 side) of the connecting surface F1 of the AC entrance 102 and can serve as a roof element for the connecting surface F1. The skirt section 104 serves to protect the connecting surface F1 of the AC entrance 102 from rain, snow, and wind (and also from a foreign object blown in by the wind).

[0054] With the internal configuration described below, the power conversion device 100 described above enables a vehicle that contains only one DC input (DC-bound vehicle) to obtain electrical power from an AC-type power supply device.

[0055] According to Fig. Four components are housed in the housing 101 of the power conversion device 100: a controller 111, an AC-side sensor 112, a power conversion circuit PC1, a DC-side sensor 116, and a power supply circuit 120. The power conversion circuit PC1 includes a power factor correction circuit (PFC circuit) 113, an isolation circuit 114, a rectifier circuit 115, and disconnect switches 131 and 132. The AC input 102 has terminals T31 to T35. The DC connector 103 has terminals T41 to T43 and a terminal block T44.

[0056] Fig. Figure 5 shows the connection surface F1 of the AC input 102 at the first end E1 of the housing 101. According to Fig. 5 together with Fig. Terminals T31 and T32 of AC input 102 are power terminals (a HOT terminal and a COLD terminal) into which AC power is input. Terminal T33 is a ground terminal and is electrically connected to a ground wire in housing 101. Terminal T34 is a PISW signal terminal and is connected to the controller 111 via a PISW signal wire in housing 101. Terminal T35 is a CPLT signal terminal and is connected to the controller 111 via a CPLT signal wire in housing 101. The connection surface F1 of AC input 102 is surrounded by the skirt section 104 of housing 101.

[0057] According to the Fig. 1 and Fig. 4. Terminals T31 to T35 of AC input 102 correspond to the respective terminals T21 to T25 of AC connector 323 of the charging cable 320. In the installed state, where AC input 102 is connected to AC connector 323, terminals T31 to T35 of AC input 102 are connected to terminals T21 to T25 of AC connector 323. When terminals T21 and T22 are electrically connected to terminals T31 and T32, AC power from the system power supply 311 can be supplied to AC input 102 via the charging cable 320. When terminal T23 is electrically connected to terminal T33, the ground wire of the charging cable 320 is electrically connected to the ground wire in the housing 101. When terminal T24 is electrically connected to terminal T34, the PISW signal output by the CPLT circuit 33 of the charging cable 320 is input into the control 111 of the power conversion device 100.When terminal T25 is electrically connected to terminal T35, communication can take place between the controller 32 of the charging cable 320 and the controller 111 of the power conversion device 100 according to the CPLT signal. The AC input 102 can include a circuit (not shown) designed to convert the PISW signal and the CPLT signal received from the charging cable 320 so that the controller 111 can process (or recognize) the PISW signal and the CPLT signal.

[0058] Fig. Figure 6 shows the connection surface F2 of the DC connector 103 at the second end E2 of the housing 101. Although Fig. Figure 6 shows an example of a DC connector for the CHAdeMO method, the technology of the present invention can also be used for a connector for another method (for example, the CCS method, the GBIT method or the Tesla method).

[0059] According to Fig. 6 and Fig. Terminals T41 and T42 of the DC connector 103 are power terminals (one P terminal, or positive terminal, and one N terminal, or negative terminal) from which DC power is output. Terminal T43 is a ground terminal and is electrically connected to the ground wire in housing 101. Terminal group T44 contains several signal terminals. Terminal group T44 includes a CAN signal terminal (CAN: Control Area Network) and a CNCT signal terminal (a terminal for checking a connector connection).

[0060] According to the Fig. 1 and Fig. 4. Terminals T41 to T43 and terminal group T44 of DC connector 103 correspond to the respective terminals T51 to T53 and terminal group T54 of DC input 210 of vehicle 200. In a state (installation state) where DC connector 103 is connected to DC input 210, terminals T41 to T43 of DC connector 103 are connected to the respective terminals T51 to T53 of DC input 210. Each terminal included in terminal group T44 is also connected to the corresponding terminal in terminal group T54. When DC connector 103 is connected to DC input 210, the control unit 111 of the power conversion device 100 and the vehicle ECU 250 of vehicle 200 are communicatively connected to each other.

[0061] The in Fig. The power conversion device 100 shown in Figure 4 is designed to perform an AC / DC conversion (conversion from AC to DC) of the AC power input from the AC input 102 and to output the DC power to the DC connector 103. The AC power input to terminals T31 and T32 of the AC input 102 is output to terminals T41 and T42 of the DC connector 103 via the AC-side sensor 112, the power conversion circuit PC1 (PFC circuit 113, isolation circuit 114, disconnect switches 131 and 132, and rectifier circuit 115), and the DC-side sensor 116.

[0062] The AC-side sensor 112 is located between terminals T31 and T32 of the AC input 102 and the PFC circuit 113. The AC-side sensor 112 includes a voltage sensor designed to detect the voltage of the electrical power input to the AC input 102, and a current sensor designed to detect the current flowing between the AC input 102 and the PFC circuit 113.

[0063] The PFC circuit 113 is designed to convert an AC voltage input from the AC input 102 into a DC voltage and then to convert the DC voltage into a high-frequency AC voltage. As a result of this power conversion and current conversion, the current waveform and current function closely resemble a sinusoidal waveform with the same phase as the voltage function, thus improving the power factor. A known PFC circuit can be used as the PFC circuit 113. A specific example of a configuration for the PFC circuit 113 is described below (see...). Fig. 7).

[0064] The isolation circuit 114 is arranged between the PFC circuit 113 and the rectifier circuit 115. The isolation circuit 114 is designed to electrically isolate the circuit on the AC input 102 side from the circuit on the DC connector 103 side. A known isolation circuit can be used as the isolation circuit 114. In the present embodiment, an isolation transformer is used as the isolation circuit 114. Electrical power transfer in the isolation circuit 114 is carried out using a voltage, not a current. A specific example of an isolation circuit 114 configuration is described below (see Figure 1). Fig. 7).

[0065] The isolating circuit 114 amplifies the AC voltage input from the AC input 102 and applies the amplified AC voltage to the circuit on the DC connector 103 side. As a result of the voltage being applied, current flows through the circuit located on the DC connector 103 side with respect to the isolating circuit 114. The AC power output from the isolating circuit 114 to the DC connector 103 is supplied to the rectifier circuit 115 via the disconnect switches 131 and 132.

[0066] The disconnect switches 131 and 132 are arranged between the isolation circuit 114 and the rectifier circuit 115. The disconnect switches 131 and 132 are designed to conduct and interrupt the current between the isolation circuit 114 and the rectifier circuit 115. The state (closed or open) of the disconnect switches 131 and 132 is controlled by the controller 111. When the disconnect switches 131 and 132 are in the closed (conducting) state, current is allowed to flow from the isolation circuit 114 to the rectifier circuit 115. When the disconnect switches 131 and 132 are in the open (disconnecting) state, current is prevented from flowing from the isolation circuit 114 to the rectifier circuit 115. The disconnect switches 131 and 132 according to the present embodiment correspond to an example of a “first switch” according to the present invention.

[0067] The rectifier circuit 115 is located on the side of the DC connector 103 with respect to the isolating circuit 114 and is designed to convert the AC power supplied by the isolating circuit 114 into DC power. Any known rectifier circuit can be used as the rectifier circuit 115. A specific example of a configuration of the rectifier circuit 115 is described below (see Figure 1). Fig. 7).

[0068] The DC-side sensor 116 is arranged between the rectifier circuit 115 and terminals T41 and T42 of the DC connector 103. The DC-side sensor 116 includes a voltage sensor designed to detect the voltage of the electrical power output to the DC connector 103 and a current sensor designed to detect the current between the rectifier circuit 115 and the DC connector 103. The rectifier circuit 115 and the current sensor of the DC-side sensor 116 according to the present embodiment each correspond to an example of a "first power conversion circuit" and a "first current sensor" according to the present invention.

[0069] Fig. Figure 7 shows details of the power conversion circuit PC1. According to Fig. 7 together with Fig. The PFC circuit 113 contains a rectifier circuit 113a and an inverter 113b. The isolation circuit 114 is an isolation transformer containing a first coil 114a and a second coil 114b.

[0070] The rectifier circuit 113a is designed to rectify and amplify the input AC power. More precisely, the rectifier circuit 113a contains two pairs of upper and lower arms, two coils, and a smoothing capacitor. In each pair of upper and lower arms, the upper arm contains a diode, and the lower arm contains a switching element. The switching element of the lower arm is controlled by the controller 111. Each switching element contained in the rectifier circuit 113a is controlled by the controller 111, and thus the rectifier circuit 113a functions as a gain-chopper circuit.

[0071] Inverter 113b is a full bridge circuit containing four switching elements. Each switching element is controlled by the controller 111. The DC power input to inverter 113b from rectifier circuit 113a is thereby converted into high-frequency AC power.

[0072] In the isolation circuit 114, the second coil 114b is located on the AC input 102 side (the side of the PFC circuit 113) with respect to the first coil 114a. The rectifier circuit 115 is connected to the first coil 114a of the isolation circuit 114, with the disconnect switches 131 and 132 positioned between them, and the PFC circuit 113 is connected to the second coil 114b of the isolation circuit 114 via an electrical conductor. The first coil 114a and the second coil 114b are electrically isolated from each other. An electrical current path on the side of the AC input 102 (side of the PFC circuit 113) with respect to the second coil 114b and an electrical current path on the side of the DC connector 103 (the side of the rectifier circuit 115) with respect to the first coil 114a are electrically isolated from each other by the isolation circuit 114.The isolating circuit 114 amplifies the AC voltage applied to the second coil 114b and outputs the amplified AC voltage to the first coil 114a.

[0073] Each of the disconnect switches 131 and 132 is connected in series with the first coil 114a and is designed to conduct and interrupt the current flowing through the first coil 114a. For example, an electromagnetic mechanical relay can be used as each disconnect switch 131 and 132. However, a solid-state relay, also known as an SSR, can also be used as each disconnect switch 131 and 132. Examples of solid-state relays include a relay constructed from a thyristor, a triac, or a transistor (for example, an IGBT, a MOSFET, or a bipolar transistor).

[0074] The rectifier circuit 115 is a diode bridge circuit containing four diodes. The rectifier circuit 115 is designed to convert the AC power supplied by the first coil 114a of the insulating circuit 114 into DC power.

[0075] When AC power is input into terminals T31 and T32 of the AC input 102 in the power conversion device 100, as described in Fig. As shown in Figure 4, DC power is generated by the power conversion circuit PC1, and the generated DC power is output to terminals T41 and T42 of the DC connector 103. At this point, a current flowing between the AC input 102 and the PFC circuit 113 is detected by the AC-side sensor 112, and a current flowing between the rectifier circuit 115 and the DC connector 103 is detected by the DC-side sensor 116. The result of the detection by the AC-side sensor 112 and the DC-side sensor 116 is input to the controller 111.

[0076] The controller 111 contains a processor, a memory device, and an input / output port (none of which are shown). A CPU (central processing unit) can be used as the processor. The memory device contains RAM (random access memory) designed to temporarily store data, and storage (for example, ROM (read-only memory) and writable non-volatile memory) designed to store various types of information. In addition to programs used in different types of control, various parameters used in the programs are also stored in the memory. The processor executes the programs stored in the memory device, thereby performing the different types of control.The different types of controls can be processed not only by means of software, but also by means of associated hardware (electronic circuitry).

[0077] The power supply circuit 120 is designed to generate drive energy for the controller 111 (i.e., electrical power or energy to operate the controller 111) using the electrical energy or power supplied by a specified power supply and to supply the generated drive energy to the controller 111. The power supply circuit 120 can generate the drive power for the controller 111 using electrical energy from a battery (not shown) in the housing 101, or it can generate the drive power for the controller 111 using electrical power flowing between the AC input 102 and the DC connector 103 (more precisely, between terminals T31 and T32 and terminals T41 and T42).

[0078] The controller 111 according to the present embodiment comprises a charging control unit 11 and a disconnect control unit 12. The charging control unit 11 and the disconnect control unit 12 are implemented, for example, by a processor and a program executed by the processor. In the present embodiment, the disconnect switches 131 and 132, the current sensor of the DC-side sensor 116, and the controller 111 constitute an example of an "interrupter" according to the present invention. The interrupter according to the present invention is housed in the casing 101.

[0079] The charging control unit 11 is designed to control the charging power of battery 240 (the battery mounted on a vehicle). More precisely, the charging control unit 11 is designed to control the PFC circuit 113 based on the results of the detection by the AC-side sensor 112 and the DC-side sensor 116, in order to control the output power of the power conversion device 100 (and also the charging power of battery 240).

[0080] The isolation control unit 12 is designed to interrupt the current between the AC input 102 and the DC connector 103 when a current abnormality is detected between the AC input 102 and the DC connector 103. More precisely, the isolation control unit 12 is designed to open the disconnect switches 131 and 132 in order to interrupt the current when the current abnormality (e.g., electrical leakage or overcurrent) is detected by the current sensor of the DC-side sensor 116 while electrical power is being input to the AC input 102 (e.g., while the vehicle 200 is drawing electrical power from the... Fig. The power supply unit 12 (shown in Figure 1) can determine that the current abnormality (more precisely, electrical leakage) occurs when the equilibrium of the current flowing through terminals T41 and T42 (the P terminal and the N terminal) is disturbed. Alternatively, the isolation control unit 12 can determine that the current abnormality (more precisely, overcurrent) occurs when an excessive current is detected at either terminal T41 or T42 (the P terminal and the N terminal).

[0081] As described above, the power conversion device 100, according to the present embodiment, includes the DC connector 103, which can be connected to the DC input 210 (DC power input) of the vehicle 200, the AC input 102, which can be connected to the AC connector 323 of the charging cable 320 (AC power cable), and the rectifier circuit 115 (first power conversion circuit), which is arranged between the AC input 102 and the DC connector 103. The rectifier circuit 115 is designed to convert the AC power input from the AC input 102 into DC power and output the DC power to the DC connector 103. Using the power conversion device 100, which is designed as described above, the AC power supplied by the energy supply device 300 for the AC process can be converted into DC power, and the DC power can be supplied to the vehicle 200.Therefore, according to the power conversion device 100 described above, the electrical power can be supplied to the vehicle 200, which only contains the DC input, by the energy supply device 300.

[0082] It is conceivable to modify the configuration of the power conversion device 100 described above such that the power conversion circuit PC1 and the DC connector 103 are arranged in separate housings. However, the problem described below can occur in the power conversion device configured as described above (hereinafter referred to as the "power conversion device according to a comparative example"). Fig. Figure 8 is a diagram illustrating the problem that may occur in the power conversion device according to the comparative example.

[0083] According to Fig. Figure 8 includes a power conversion device 500 according to the comparative example, an AC input 501, a cable 502, and a DC connector 503. A housing of the AC input 501 is connected to a housing of the DC connector 503 via a cable 502. The cable 502 is a known flexible cable used in a general charging cable. The power conversion circuit PC1 described above (see Figure 8) Fig. 4) is housed in the casing of the AC input 501. The AC input 501 and the DC connector 503 are electrically connected to each other via an electrical conductor in the cable 502.

[0084] In the power conversion device 500 described above, the AC input 501, which includes the built-in power conversion circuit PC1, is heavy. Therefore, mechanical stress is likely exerted on the cable 502 due to the weight of the AC input 501. Furthermore, the flexible cable 502 is used, and thus torsion likely occurs in the cable 502. Moreover, the heavy AC input 501 in the example of the Fig. 8 is located on the Earth's surface F20. Therefore, immersion of AC input 501 in water is likely.

[0085] In contrast, in the power conversion device 100 according to the present embodiment, the AC input 102, the DC connector 103 and the power conversion circuit PC1 are arranged in a single housing 101 and thus integrated, as shown in the Fig. 3 and Fig. Figure 4 shows that by connecting the DC connector 103 of the power conversion device 100 to the DC input 210 of the vehicle 200, the entire power conversion device 100 can be supported by the vehicle 200. This reduces the mechanical stress compared to the example described above, which uses a flexible cable, and thus improves the durability and strength of the power conversion device 100. Furthermore, according to the present embodiment, the power conversion device 100 is held at a higher position than the ground F20 (see Figure 4). Fig. 3) Therefore, immersion of the power conversion device 100 in water is easily avoided.

[0086] In the power conversion device 100 according to the present embodiment, the power conversion circuit PC1, which is housed in the enclosure 101, includes the isolation circuit 114, which is arranged between the AC input 102 and the DC connector 103 (see Fig. 4) The process continues without a paragraph break. The controller 111 is designed to open the disconnect switches 131 and 132 to interrupt the current when a current abnormality is detected by the DC-side sensor 116 while electrical power is being input to the AC input 102. In the power conversion device 100, configured as described above, the circuit on the AC input 102 side and the circuit on the DC connector 103 side are electrically isolated from each other by the isolating circuit 114. Therefore, even if an overcurrent occurs in the circuit on the AC input side 102 with respect to the isolation circuit 114, the overcurrent does not flow into the circuit on the DC connector side 103 with respect to the isolation circuit 114. Furthermore, when the current abnormality is detected, the controller 111 causes the disconnect switches 131 and 132 to interrupt the current.Therefore, even if, for example, an abnormality in the current occurs during charging of battery 240, the circuit on the power receiving side (for example, the electronic circuit of the vehicle 200) can be adequately protected.

[0087] In the power conversion device 100 according to the present embodiment, each of the disconnect switches 131 and 132 is connected in series with the first coil 114a of the isolation circuit 114 (more precisely, an isolation transformer) and is designed to conduct and disconnect a current flowing through the first coil 114a. In the power conversion device 100 described above, the current near the isolation circuit 114 can be interrupted if an abnormal current is detected. Isolation is achieved by both the isolation circuit 114 and the disconnect switches 131 and 132, thus providing even more reliable protection for the circuit on the power receiving side.

[0088] The AC input 102 of the power conversion device 100 according to the present embodiment includes terminals T31 and T32 (power terminals), which can be connected to a power line of the charging cable 320, terminal T35 (CPLT signal terminal), which can be connected to a CPLT signal line of the charging cable 320, and terminal T33 (ground terminal), which can be connected to a ground line of the charging cable 320. According to the power conversion device 100 described above, the battery 240 can be charged appropriately. Second embodiment

[0089] A power conversion device according to a second embodiment of the present invention is described below. The power conversion device according to the second embodiment is also suitable, for example, for the application described in Fig. One of the energy supply systems shown can be used. Since there are many common features between the first embodiment and the second embodiment, mainly the differences are described, and the description of the common features is not repeated.

[0090] Fig. Figure 9 shows a configuration of the power conversion device according to the second embodiment of the present invention. Fig. 9 has a power conversion device 100A according to the second embodiment basically the same configuration as the power conversion device 100 (see Fig. 4) according to the first embodiment. However, the power conversion device 100A includes a housing 101A instead of the housing 101. The housing 101A contains a power conversion circuit PC2 and a controller 111A instead of the power conversion circuit PC1 and the controller 111 in the housing 101. The housing 101A also contains switches 171 and 172, a current sensor 173, and an electrical output 180.

[0091] The 100A power conversion device is designed, when AC power is input to the AC input 102, to perform an AC / DC conversion (conversion from AC to DC) of the input AC power and output the DC power to the DC connector 103. The 100A power conversion device is also designed, when DC power is input to the DC connector 103, to perform a DC / AC conversion (conversion from DC to AC) of the input DC power and output the AC power to the AC input 102. The power conversion circuit PC2 in the 100A power conversion device is designed to perform bidirectional power conversion.

[0092] The power conversion circuit PC2 contains an inverter 143, disconnect switches 151 and 152, an isolation circuit 144, disconnect switches 161 and 162, and an inverter 145. The power conversion circuit PC2 serves as a bidirectional converter. A specific example of a configuration of the power conversion circuit PC2 is described later (see Fig. 10) In the power conversion device 100A, an AC-side sensor 112 is arranged on the AC input side 102 of the power conversion circuit PC2, and a DC-side sensor 116 is arranged on the DC connector side 103 of the power conversion circuit PC2. The configurations of the AC-side sensor 112 and the DC-side sensor 116 are, for example, the same as in the first embodiment. The inverter 145 and the current sensor of the DC-side sensor 116 according to the present embodiment each correspond to an example of a “first power conversion circuit” and a “first current sensor” according to the present invention. Furthermore, the inverter 143 and the current sensor of the AC-side sensor 112 according to the present embodiment each correspond to an example of a “second power conversion circuit” and a “second current sensor” according to the present invention.

[0093] The disconnect switches 151 and 152 are arranged between the inverter 143 and the isolation circuit 144. The disconnect switches 151 and 152 are designed to conduct and disconnect or interrupt a current between the inverter 143 and the isolation circuit 144. The state (closed state or open state) of the disconnect switches 151 and 152 is controlled by the controller 111A. When the disconnect switches 151 and 152 are in the closed state (conducting state), a current path connecting the inverter 143 and the isolation circuit 144 is open. When the disconnect switches 151 and 152 are in the open state (disconnecting state), the current path connecting the inverter 143 and the isolation circuit 144 is closed. The disconnect switches 151 and 152 according to the present embodiment correspond to an example of a "second switch" according to the present invention.

[0094] The disconnect switches 161 and 162 are arranged between the isolation circuit 144 and the inverter 145. The disconnect switches 161 and 162 are designed to conduct and interrupt a current between the isolation circuit 144 and the inverter 145. The state (closed state or open state) of the disconnect switches 161 and 162 is controlled by the controller 111A. When the disconnect switches 161 and 162 are in the closed state (conducting state), a current path connecting the isolation circuit 144 and the inverter 145 is open. When the disconnect switches 161 and 162 are in the open state (disconnecting state), the current path connecting the isolation circuit 144 and the inverter 145 is closed. The disconnect switches 161 and 162 according to the present embodiment correspond to an example of a "first switch" according to the present invention.

[0095] Fig. Figure 10 shows details of the power conversion circuit PC2. According to Fig. 10 together with Fig. Inverter 143 contains a first inverter 143a and a second inverter 143b. The first inverter 143a contains a full bridge circuit with four switching elements, two coils, and a smoothing capacitor. The second inverter 143b is a full bridge circuit with four switching elements. Inverter 145 is also a full bridge circuit with four switching elements. Each of the switching elements in inverters 143 and 145 is controlled by the controller 111A.

[0096] The isolating circuit 144 is an isolating transformer comprising a first coil 144a and a second coil 144b. The second coil 144b is located on the side of the AC input 102 (the side of the inverter 143) opposite the first coil 144a. The inverter 143 is connected to the second coil 144b of the isolating circuit 144, with disconnect switches 151 and 152 positioned between them, and the inverter 145 is connected to the first coil 144a of the isolating circuit 144, with disconnect switches 161 and 162 positioned between them. The first coil 144a and the second coil 144b are electrically isolated from each other. An electrical current path on the side of the AC input 102 (side of the inverter 143) with respect to the second coil 144b and an electrical current path on the side of the DC connector 103 (side of the inverter 145) with respect to the first coil 144a are electrically isolated from each other by the insulating circuit 144.

[0097] Each of the disconnect switches 151 and 152 is connected in series with the second coil 144b and is designed to conduct and interrupt a current flowing through the second coil 144b. Each of the disconnect switches 161 and 162 is connected in series with the first coil 144a and is designed to conduct and interrupt a current flowing through the first coil 144a. For example, a respective electromagnetic mechanical relay can be used as disconnect switch 151, 152, 161, and 162. However, the disconnect switches 151, 152, 161, and 162 are not limited to this, and a respective solid-state relay can be used as disconnect switch 151, 152, 161, and 162.

[0098] According to Fig. Electrical output 180 is designed to output AC power generated by the power conversion circuit PC2 from the DC power input to the DC connector 103. Electrical output 180 is connected to terminals T31 and T32, with switches 171 and 172 positioned between them. The state (closed or open) of switches 171 and 172 is controlled by the controller 111A. Current sensor 173 is positioned between terminal T31 and switch 171. Current sensor 173 is designed to measure the current at electrical output 180. The result of the current sensor reading is output to the controller 111A.When switches 171 and 172, described above, are in the closed (conducting) state, electrical power equal to that supplied to terminals T31 and T32 is supplied to electrical output 180. When switches 171 and 172 are in the open (disconnecting) state, no electrical power is supplied to electrical output 180. In the example of... Fig. 9 The current sensor 173 is located on the side of switch 171 with respect to branch point D1. However, the current sensor 173 can also be located on the side of terminal T31 with respect to branch point D1.

[0099] In the power conversion device according to the present embodiment, the AC input 102, the DC connector 103, the power conversion circuit PC2, and the electrical output 180 are arranged and thus integrated in a single housing 101A. The electrical output 180 is exposed at an end face of the housing 101A on the side of the AC input 102. Furthermore, the first end E1 of the housing 101A on the side of the AC input 102 includes the skirt section 104, which projects around the connection surface F1 of the AC input 102. In the present embodiment, a region surrounded by the skirt section 104 includes not only the connection surface F1 of the AC input 102 but also a connection surface F3 of the electrical output 180.

[0100] Fig. Figure 11 shows an end face of the first end E1 of the housing 101A, where the AC input 102 and the electrical output 180 are exposed. In the example of the Fig. 11 is the end surface (mainly the end surface containing the connecting surfaces F1 and F3) of the first end E1 in a rectangular shape. However, the shape of the end surface of the first end E1 is not limited to a rectangular shape and can be elliptical or circular.

[0101] According to Fig. 11. The connection surface F1 of the AC input 102 and the connection surface F3 of the electrical output 180 are exposed on the surface of the housing 101A such that external connections can be made to the connection surface F1 of the AC input 102 and the connection surface F3 of the electrical output 180, and are surrounded by the skirt section 104. The skirt section 104 faces the outer side (X2 side in the DC connection state, which is described in Fig. (as shown in Figure 3) around the connecting surfaces F1 and F3. Part of the skirt section 104 is arranged at the connecting surfaces F1 and F3 and can serve as a roof element for the connecting surfaces F1 and F3. The skirt section 104 serves to protect the connecting surfaces F1 and F3 from rain, snow, and wind (and also from foreign objects blown in by the wind).

[0102] According to Fig. 9. Controller 111A has the same hardware configuration as controller 111 of the first embodiment. That is, controller 111A includes a processor and a memory device (neither of which are shown). However, different programs than those of controller 111 are stored in the memory device of controller 111A, and controller 111A is designed to perform a different process than that of controller 111. Controller 111A includes a charging control unit 11A, a disconnect control unit 12A, and a power supply control unit 13A. The charging control unit 11A, the disconnect control unit 12A, and the power supply control unit 13A are achieved, for example, by a processor and a program executed by the processor.In the present embodiment, the disconnect switches 151, 152, 161 and 162, the current sensor of the AC-side sensor 112, the current sensor of the DC-side sensor 116 and the controller 111A form an example of an "interrupter" according to the present invention. The interrupter according to the present embodiment is housed in the casing 101A.

[0103] The 11A charging control unit, for example, is designed to provide a charging capacity of 240 watts for a battery (vehicle-mounted battery) located in Fig. As shown in 1, to control. When electrical power is input into AC input 102 (for example, when the vehicle receives 200 in the Fig. In the energy supply system shown in section 1, electrical power is supplied from the energy supply unit 300 via the power conversion device 100A, the power conversion circuit PC2, which is located in Fig. Figure 10 shows how it is operated as follows.

[0104] According to Fig. 10 together with Fig. 9. The first inverter 143a rectifies the AC power input from the AC input 102 and outputs the rectified AC power to the second inverter 143b. The second inverter 143b converts the DC power received from the first inverter 143a into high-frequency AC power. The isolation circuit 144 transmits the output (AC power) of the second inverter 143b to the inverter 145. The inverter 145 rectifies the AC power received from the isolation circuit 144 and outputs the rectified AC power to the DC connector 103. The charging control unit 11A is designed to control the inverters 143 and 145 based on a result of a detection by the AC-side sensor 112 and the DC-side sensor 116 respectively, in order to control the output power of the power conversion device 100A (and also the charging power of the battery 240).

[0105] According to Fig. 9. The 12A isolating control unit is designed to open the disconnect switches 161 and 162 when a current abnormality (e.g., electrical leakage or overcurrent) is detected by the current sensor of the DC-side sensor 116 while electrical power is being input to the AC input 102, as described above. Therefore, the circuit on the power receiving side (e.g., the vehicle's electronic circuitry) can be protected if a current abnormality occurs.

[0106] The 13A energy supply control unit is designed for a vehicle with an electrical power output of 200, which is in Fig. As shown in Figure 1 (for example, the electrical power stored in the vehicle-mounted battery or electrical power generated in the vehicle 200) is supplied to the outside of the vehicle, the power supply control unit 13A is designed to control the supplied electrical power. The power supply control unit 13A is designed to close switches 171 and 172 when the power supply to the outside of the vehicle starts (for example, when a predefined start condition is met) and to open switches 171 and 172 when the power supply to the outside of the vehicle ends (when a predefined end condition is met). When the electrical energy or power is input into the DC connector 103 (for example, when the electrical power or energy from the vehicle 200 is supplied to the outside of the vehicle via the power conversion device 100A in the figure shown in Figure 1), the power supply control unit 13A is designed to control the supplied electrical power. Fig. (as shown in the energy supply system shown in 1), the power conversion circuit PC2, which is located in Fig. Figure 10 shows how it is operated as follows.

[0107] According to Fig. 10 together with Fig. 9. Inverter 145 converts the DC power input from DC connector 103 into high-frequency AC power and outputs the high-frequency AC power to isolation circuit 144. Isolation circuit 144 transmits the output (AC power) of inverter 145 to the second inverter 143b, and the second inverter 143b rectifies the AC power received from isolation circuit 144 and outputs the rectified AC power to the first inverter 143a. The first inverter 143a converts the DC power received from the second inverter 143b into AC power and outputs the AC power to AC input 102 and electrical output 180. As a result, the electrical power output from AC input 102 and electrical input 180 can be supplied to an electrical load (not shown).If a plug connected to the electrical load is connected to electrical output 180, or if an AC connector connected to the electrical load is connected to AC input 102, electrical power from the vehicle can be supplied to the electrical load. Examples of electrical loads include a V2H (Vehicle-to-Home) stand, electrical equipment (such as cooking and lighting equipment used outdoors), and an energy storage device from another vehicle.

[0108] According to Fig. 9. The 12A isolating control unit is designed to open switches 151 and 152 when a current abnormality (e.g., an electrical leakage or overcurrent) is detected by the current sensor of the AC-side sensor 112 while electrical power is being input into the DC connector 103, as described above. Therefore, the circuit on the power receiving side (e.g., the electronic circuit of the electrical load) can be protected if a current abnormality occurs.

[0109] As described above, in the power conversion device 100A according to the present embodiment, the AC power supplied by the power supply unit for the AC process can be converted into DC power, and the DC power can be supplied to the vehicle. Furthermore, the AC power can be supplied to the exterior of the vehicle via the power conversion device 100A according to the present embodiment. Other embodiments

[0110] Each of the housings 101 and 101A described above has a straight shape; the DC connector 103 is located at one end (X1 side) in the DC connection state shown in Fig. 3 is shown) of the respective housings 101 and 101A, and the AC input 102 is on the opposite side (X2 side in the DC connection state shown in Fig. (as shown in Figure 3). However, the shape of the respective housings 101 and 101A is not limited to such a shape and can be suitably modified. As in the first modification described below, a body section of a power conversion device housing can be curved.

[0111] Fig. Figure 12 shows an appearance of a power conversion device according to the first modification. Fig. Figure 13 shows a state in which the power conversion device according to the first modification is connected to the vehicle 200. According to the Fig. 12 and Fig. In the power conversion device 100B, according to the first modification, the body section of the housing 101B is curved. Therefore, the connection surface F1 of the AC input 101 points downwards in the DC connection state, and the connection surface F2 of the DC connector 103 points in the direction of arrow X1. The connection surfaces F1 and F2 are exposed on a surface of the housing 101B such that external connections can be made to them. Because the connection surface F1 of the AC input 102 points downwards, it is not easily wetted by rain. Similarly, snow accumulation on the connection surface F1 of the AC input 102 is easily avoided in snowfall. "Pointing downwards" means pointing downwards and sideways (horizontally).“Pointing downwards” includes not only a pointing in a direction vertically downwards, but also a pointing in a direction diagonally inclined with respect to the vertical direction.

[0112] The power conversion device 100B, according to the first modification, is configured such that the connection surface F1 of the AC input 102 is inclined relative to a mounting surface F10 between the DC connector 103 and the DC input 210 in a state where the DC connector 103 is inserted into the DC input 210. The angle θ formed between the mounting surface F10 and the connection surface F1 of the AC input 102 is greater than 0° and less than 90°. The connection surface F1 of the AC input 102 faces away from the vehicle 200. With this configuration, the user can easily see the connection surface F1 of the AC input 102. Fig. Figure 13 shows an example where the connection surface F1 of the AC input 102 points downwards in the DC connection state. However, the direction of the connection surface F1 of the AC input 102 in the DC connection state can be a direction of arrow Z2 (vertically downwards).

[0113] The power conversion device 100B contains the power conversion circuit PC1 (see Fig. 7) between the first end E1 and the second end E2 (i.e., the body section) in the housing 101B. Furthermore, the AC input 102 is located in the power conversion device 100B below (Z2 side) the DC connector 103. As a result, the AC connector 323 of the charging cable 320, located on the ground surface F20, is simply connected to the AC input 102.

[0114] Fig. Figure 14 shows an appearance of a power conversion device according to a second modification. According to Fig. 14 The body section of the housing 101C in the housing 101C of the power conversion device 100C according to the second embodiment is curved. Therefore, the connection surface F1 of the AC input 102 points downwards in the DC connection state (more precisely, inclined diagonally downwards with respect to a vertical direction), and the connection surface F2 of the DC connector 103 points in the direction of arrow X1. The connection surfaces F1 and F2 are exposed on a surface of the housing 101C such that external connections can be made to the connection surfaces F1 and F2. Since the connection surface F1 of the AC input 102 points downwards, it is not easily wetted by rain when it rains.Since the connection surface F1 of the AC input 102 is inclined diagonally downwards in the DC connection state of the power conversion device 100C with respect to the vertical direction (Z-axis), the user can see the connection surface F1 even more easily than in the case where the connection surface F1 of the AC input 102 points vertically downwards, and thus the charging cable is connected to the AC input 102 even more easily.

[0115] Furthermore, the housing 101C has gripping sections G1 and G2, a housing section P1, and a stepped section P2 between the first end E1 and the second end E2 (i.e., the body section). Gripping section G1 has an annular handle. Gripping section G2 is in a rod shape (i.e., a circular cylindrical shape). By holding gripping section G1 or G2, the user can easily carry the power conversion device 100C. Housing section P1 is located on the side of the second end E2 of gripping section G2 and is in a cylindrical shape (for example, a circular cylindrical shape) that is thicker than gripping section G2. The power conversion circuit PC1 (see Fig. 7) is housed in the housing section P1. The stepped section P2 is formed between the housing section P1 and the gripping section G2. Using the stepped section P2, the user can push the housing section P1 and the second end E2 towards the vehicle. As a result, the DC connector 103 is easily connected to the vehicle's DC input. The first end E1 of the housing 101C may contain a skirt section.

[0116] In the first and second embodiments described above, the skirt section 104, which is formed around the connection surface F1 of the AC input 102, is used as a roof element for the connection surface F1 of the AC input 102 (see Fig. 4 and Fig. 11). However, the roof element for the connecting surface F1 of the AC entrance 102 is not limited to the skirt section 104.

[0117] Fig. Figure 15 is a diagram that represents a first modification of the roof element for the connecting surface F1 of the AC input 102. Fig. Figure 16 shows a state in which a lower lid is present in the example of the Fig. 15 is closed.

[0118] According to Fig. Figure 15 includes a housing 101D of the power conversion device according to the present modification, comprising an upper cover 105a and a lower cover 105b at the first end E1. The upper cover 105a and the lower cover 105b at the first end E1 are coupled to each other via a hinge H1. The lower cover 105b can be opened and closed relative to the upper cover 105a as a result of a rotation about the hinge H1. The Fig. The state shown in Figure 15 is one in which the lower cover 105b is open. In this state, the connection surface F1 of the AC input 102 is exposed to the outside, and thus an external connection can be easily made to the connection surface F1.

[0119] When the lower cover 105b is closed, as shown in Fig. As shown in Figure 16, the connection surface F1 of the AC input 102 is housed within the casing 101d and is no longer exposed to the outside. When the lower cover 105b is closed, the connection surface F1 of the AC input 102 is covered by the lower cover 105b, thus protecting it from rain, snow, and wind (and also from any foreign object blown in by the wind).

[0120] According to the Fig. 15 and Fig. 16 The upper cover 105a is positioned above the connection surface F1, regardless of whether the lower cover 105b is open or closed, and serves as a roof element for the connection surface F1. Due to the upper cover 105a, the connection surface F1 of the AC entrance 102 is not simply wetted by rain.

[0121] Fig. 17 represents a second modification of the roof element for the connecting surface F1 of the AC input 102.

[0122] According to Fig.In the housing 101E of the power conversion device according to the present modification, a roof element 106 is arranged for the connection surface F1 of the AC input 102 at the first end E1. The roof element 106 is fixed to the connection surface F1 and projects towards the outer side of the first end E1. By providing such a roof element 106, the connection surface F1 of the AC input 102 is not easily wetted by rain. The size of the projection of the roof element 106 is preferably not less than 3 cm and not more than 20 cm.

[0123] An element and / or mechanism can be added to any of the power conversion devices described above as needed. For example, a bracket (support element) can be arranged at the second end E2 of the power conversion device to make it easier for the vehicle to carry or support the device. Alternatively, at least one of the AC input 102 and one of the DC connector 103 can have a rotating mechanism to change the angles of the connecting surfaces F1 and F2. The number of AC inputs 102 and DC connectors 103 is arbitrary, as long as there is one or more of them, and can, for example, be two or more. The size of the power conversion device (and also of the housing) is also arbitrary.The power conversion device can be a small unit with a total length of less than 30 cm, or a large unit with a total length of more than 1 m, or a unit with a total length of at least 30 cm and not more than 1 m. The power conversion device can be mounted on a vehicle or provided by an administrator of a power supply facility.

[0124] In each of the modifications described above, the power conversion circuit PC2 can be used instead of the power conversion circuit PC1. Furthermore, the embodiments and modifications described above can be implemented in combination.

[0125] While the embodiments of the present invention have been described, it is understood that the embodiments described here are only exemplary and not limiting. The scope of the present invention is defined by the claims.

Claims

[1] Power conversion device comprising: a housing (101, 101A, 101B) containing a DC connector (103) and an AC input (102); a first power conversion circuit (115, 145) housed in the casing; and an isolating circuit (114, 144) and an interrupter, which are housed in the casing; wherein the DC connector (103) can be connected to a DC power input (210) of a vehicle (200), the AC input (102) can be connected to a connector (323) of a cable for AC power (320), the first power conversion circuit (115, 145) is arranged between the AC input and the DC connector and is designed to convert AC power input from the AC input side into DC power and output the DC power to the DC connector side, the isolation circuit (114, 144) is arranged between the AC input and the DC connector, The interrupter is designed to interrupt a current between the AC input and the DC connector when the interrupter detects an abnormality in the current between the AC input and the DC connector, and at one end of the housing on the side of the AC input (102) includes a skirt section (104) which projects around a connecting surface (F1) of the AC input (102), wherein the connecting surface (F1) of the AC input (102) is surrounded by the skirt section (104). [2] Power conversion device according to claim 1, wherein the AC input is arranged below the DC connector and above an earth contact surface (F20) of the vehicle when the DC connector is connected to the DC power input. [3] Power conversion device according to claim 1 or 2, wherein a connecting surface (F1) of the AC input is inclined with respect to a mounting surface (F10) between the DC connector and the DC power input when the DC connector is mounted in the DC power input. [4] Power conversion device according to any one of claims 1 to 3, wherein the housing is designed to be supported by the vehicle in a state suspended relative to the earth when the DC connector is connected to the input for DC power. [5] Power conversion device according to one of claims 1 to 4, wherein the housing includes a roof element (104, 105a, 106) for a connecting surface (F1) of the AC input. [6] Power conversion device according to any one of claims 1 to 5, wherein the first power conversion circuit is located on the side of the DC connector in relation to the isolation circuit, The interrupter contains: a first switch (131, 132, 161, 162) designed to conduct and interrupt a current between the isolation circuit and the DC connector; a first current sensor (116) designed to detect a current flowing between the first power conversion circuit and the DC connector; and a first controller (111, 111A) designed to control the first switch, and The first control is designed to bring the first switch into an open state to interrupt the current when the current abnormality is detected by the first current sensor while electrical power is being input into the AC input. [7] Power conversion device according to any one of claims 1 to 6, which further comprises: a second power conversion circuit (143) which is housed in the casing, wherein the second power conversion circuit (143) is arranged between the AC input and the isolation circuit and is designed to perform a predetermined power conversion, The interrupter contains: a second switch (151, 152) designed to conduct and interrupt a current between the AC input and the isolation circuit; a second current sensor (112) designed to detect a current flowing between the second power conversion circuit and the AC input; and a second controller (111A) designed to control the second switch, and The second controller is designed to bring the second switch into an open state to interrupt the current when the current abnormality is detected by the second current sensor while electrical power is being input into the DC connector. [8] Power conversion device according to any one of claims 1 to 7, wherein the first power conversion circuit is designed to convert the DC power input from the DC connector side into AC power and output the AC power to the AC input side.

Images