Power supply device

Abstract

In a power supply whose connection state can be changed, this enables easy switching of the connection state with a simple configuration. [Solution] The system comprises a first power supply unit 110 and a second power supply unit 110 capable of supplying DC power and changing the output voltage; a first connector 120 connected to the first power supply unit 110; a second connector 120 connected to the second power supply unit 110; an information acquisition unit 140 that acquires connection information including at least one of the following regarding the external connection status to the first connector 120 and the second connector 120: information that identifies the first connector 120 and the second connector 120 as being connected in series; information that identifies the first connector 120 and the second connector 120 as being connected in parallel; and a control unit 150 that controls the first power supply unit 110 and the second power supply unit 110 based on the connection information.

Description

[Technical Field]

[0001] This disclosure relates to a power supply device. [Background technology]

[0002] There is a conventional technology that uses power supplies connected in parallel. Patent Document 1 discloses a power supply device that can reliably detect miswiring, such as unconnected terminals or incorrect connections, in a parallel inverter device consisting of multiple inverters. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2013-113695 [Overview of the project] [Problems that the invention aims to solve]

[0004] Traditionally, connecting and configuring parallel-connectable power supplies required specialized knowledge.

[0005] This disclosure aims to enable easy switching of connection states in a power supply whose connection state can be changed, using a simple configuration. [Means for solving the problem]

[0006] The power supply device of this disclosure comprises a first power supply unit and a second power supply unit capable of supplying DC power and changing the output voltage; a first connector connected to the first power supply unit; a second connector connected to the second power supply unit; an acquisition means for acquiring connection information that includes at least one of the following regarding the external connection status to the first and second connectors: information that identifies the first and second connectors as being connected in series; information that identifies the first and second connectors as being connected in parallel; and information that identifies the first and second connectors as not being connected; and a control unit that controls the first and second power supply units based on the connection information. In this case, switching the operation control of a plurality of power supply units can be easily implemented in accordance with the external connection status to a plurality of connectors corresponding to a plurality of power supply units. Here, if the connection information identifies that the first connector and the second connector are connected in series, the control unit controls the first power supply unit and the second power supply unit so that the output current of the first power supply unit and the output current of the second power supply unit are the same. In this case, appropriate operation control can be performed for power supply units corresponding to multiple connectors connected in series externally. Furthermore, if the connection information identifies that the first connector and the second connector are connected in parallel, the control unit controls the first power supply unit and the second power supply unit so that the output voltage of the first power supply unit and the output voltage of the second power supply unit are the same. In this case, appropriate operation control can be performed for power supply units corresponding to multiple externally connected parallel connectors. Furthermore, if the connection information indicates that the first connector and the second connector are not connected, the control unit controls the first power supply unit and the second power supply unit individually. In this case, appropriate operation control can be performed for power supply units corresponding to multiple externally connected connectors. Furthermore, the control unit is capable of performing a first control that supplies power from the first power unit to the first connector without supplying power from the second power unit to the second connector, and the acquisition means includes a voltage detection means for detecting the voltage of the second connector, and a determination means for determining whether the first connector and the second connector are connected in parallel based on the voltage value detected by the voltage detection means during the first control. In this case, appropriate operation control can be performed on the power unit according to the external connection status to a plurality of connectors, which is identified based on the voltage detection result of the connectors. Furthermore, the control unit is capable of performing a first control that supplies power from the first power supply unit to the first connector without supplying power from the second power supply unit to the second connector. The acquisition means includes a current detection means for detecting the current of the second connector, and a determination means for determining whether the first connector and the second connector are connected in series based on the current value detected by the current detection means during the second control. In this case, appropriate operation control can be performed on the power supply unit according to the external connection status to a plurality of connectors, which is identified based on the voltage detection result of the connectors. Furthermore, the power supply device of this disclosure further comprises a converter circuit connectable to a DC power supply, an inverter circuit connectable to an AC power supply, and a DC bus connecting the converter circuit and the inverter circuit. The first power supply unit is connected to the DC bus and can convert the DC power of the DC bus into power and supply it to the first connector. The second power supply unit is connected to the DC bus and can convert the DC power of the DC bus into power and supply it to the second connector. In this case, switching the operation control of the multiple power supply units can be easily implemented depending on the external connection status to the multiple connectors corresponding to the multiple power supply units. [Brief explanation of the drawing]

[0007] [Figure 1] This diagram shows the configuration of the power supply device according to this embodiment. [Figure 2]This diagram shows how external devices are individually connected to each connector. [Figure 3] This diagram shows a configuration in which one external device is connected in parallel to a connector using two connectors. [Figure 4] This diagram shows a configuration in which one external device is connected in series to a connector using two connectors. [Figure 5] This is a diagram showing the external appearance of the power supply unit. [Figure 6] These diagrams illustrate examples of branching wires in a connector or harness. Figure 6(A) shows an example of a configuration where wires are branched in a connector, and Figure 6(B) shows an example of a configuration where wires are branched in a harness. [Figure 7] These diagrams illustrate examples of branching wires using relay connectors. Figure 7(A) shows an example of a harness branching configuration using a relay connector, and Figure 7(B) shows an example of a wire branching configuration inside a connector connected to a power supply unit. [Figure 8] This diagram shows how to control a power supply unit according to the connection configuration to the power supply unit's connector. [Figure 9] This figure shows an example configuration for feeding back the connector's current value to the control unit. [Figure 10] This diagram shows how to control the output current of a power supply unit. Figure 10(A) shows the current value acquisition location and control command, and Figure 10(B) shows the current value control method. [Figure 11] This diagram shows how to control the output current of a power supply unit when controlling the output voltage for a single power supply unit. Figure 11(A) shows the current value acquisition location and control command, and Figure 11(B) shows the current value control method. [Figure 12] This figure shows an example of the configuration of the information acquisition unit. [Figure 13] This timing chart shows the operation when external devices are individually connected to each connector. [Figure 14]A timing chart showing the operation when one external device is connected in parallel to one connector and a separate external device is individually connected to another connector. [Figure 15] A timing chart showing the operation when one external device is connected in parallel to all connectors. [Figure 16] A diagram showing a configuration example of an information acquisition unit. [Figure 17] A diagram showing a current path when a plurality of connectors are connected in series. [Figure 18] A timing chart showing the operation when external devices are individually connected to all connectors. [Figure 19] A timing chart showing the operation when one external device is connected in series to one connector and a separate external device is individually connected to another connector. [Figure 20] A timing chart showing the operation when one external device is connected in series to all connectors. [Figure 21] A diagram showing an example of an information acquisition method by communication. [Figure 22] A diagram showing an example of an information acquisition method according to the connector shape. FIG. 22(A) is a diagram showing an example of a connector shape for individual connection, FIG. 22(B) is a diagram showing an example of a connector shape for parallel connection, and FIG. 22(C) is a diagram showing an example of a connector shape for series connection. [Figure 23] A diagram showing an example of an information acquisition method by image recognition. [Figure 24] A diagram showing another configuration example of the power supply device. [Figure 25] A diagram showing an application example of the power supply device.

Embodiments for Carrying Out the Invention

[0008] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. <Configuration of the Power Supply Device> Figure 1 shows the configuration of the power supply unit according to this embodiment. The power supply unit 100 is connected to an AC power supply 300 and a DC power supply 400. The AC power supply 300 is, for example, a grid power supply. The DC power supply 400 is, for example, a solar panel or a storage battery.

[0009] The power supply unit 100 comprises a plurality of power supply units 110, a plurality of connectors 120, a plurality of switches 130, an information acquisition unit 140, a control unit 150, an AC / DC converter (inverter circuit) 161, and a DC / DC converter (converter circuit) 162. The plurality of power supply units 110, the plurality of connectors 120, and the plurality of switches 130 are individually associated with each other.

[0010] The power supply unit 100 is connected to the AC power supply 300 via the AC / DC converter 161 and to the DC power supply 400 via the DC / DC converter 162. The power supply unit 110 is also connected to the AC / DC converter 161 and the DC / DC converter 162 via the DC bus 190 and is supplied with DC power from the DC bus 190.

[0011] The power supply unit 110 is equipped with a DC / DC converter 111. The power supply unit 110 converts the supplied DC power into power using the DC / DC converter 111 and supplies it to the connector 120 via the switch 130. The power supply unit 110 is configured to allow modification of the output voltage or output current. The power supply unit 110 is configured to supply DC power to the connector 120 in only one direction. The outputs of the multiple power supply units 110 are electrically isolated from each other.

[0012] Connector 120 connects to external devices acting as loads. External devices can receive power by connecting to connector 120. External devices can be connected to multiple connectors 120 individually, or to multiple connectors 120 by parallel or series wiring. The configurations of how external devices can be connected to connector 120 (individually, in parallel, or in series) will be described later.

[0013] Switch 130 switches the power supply (ON) and cut-off (OFF) of power from the power supply unit 110 to the connector 120. The ON / OFF switching of switch 130 is controlled by the control unit 150.

[0014] The information acquisition unit 140 acquires information to identify the connection method of the external device to the connector 120. Based on the acquired information, the information acquisition unit 140 determines the connection method of the external device connected to the connector 120 and sends information indicating the determination result (hereinafter referred to as "connection information") to the control unit 150.

[0015] The control unit 150 controls each of the multiple power supply units 110 based on the connection information acquired from the information acquisition unit 140. Specifically, the control unit 150 controls the output voltage and output current of each power supply unit 110. The control unit 150 also individually controls multiple switches 130 to switch the ON / OFF of the power supply from each power supply unit 110 to each connector 120. The control unit 150 is implemented, for example, by a memory that stores a program and a processor that executes the program stored in the memory.

[0016] <Connection methods to the power supply unit> Next, with reference to Figures 2 to 4, the connection configuration of external devices to the power supply unit 100 will be described. For simplicity, the connection configuration of external devices to two connectors 120 connected to two power supply units 110 will be shown here. When distinguishing between each power supply unit 110 and each connector 120, the subscripts A and B will be added, such as power supply unit 110A and connector 120A. In Figures 2 to 4, the external device 210 is connected to the connector 120 of the power supply unit 100 by connector 201.

[0017] Figure 2 shows a configuration in which external devices 210 are individually connected to connectors 120A and 120B. In the example shown in Figure 2, one external device 210 is connected to connector 120A via connector 201. Another external device 210 is connected to connector 120B via connector 201.

[0018] Figure 3 shows an configuration in which one external device 210 is connected in parallel to connectors 120A and 120B using two connectors 201. In the example shown in Figure 3, the two connectors 201 of one external device 210 are connected to connectors 120A and 120B, respectively. In the example shown in Figure 3, the wires from the two connectors 201 to the external device 210 merge and are connected to the external device 210, resulting in a parallel connection.

[0019] Figure 4 shows an configuration in which an external device 210 is connected in series to connectors 120A and 120B using two connectors 201. In the example shown in Figure 4, the two connectors 201 of an external device 210 are connected to connectors 120A and 120B, respectively. In the example shown in Figure 4, a portion of the conductors connected to the two connectors 201 are connected in series, with one connector 201 being connected to the other connector 201.

[0020] <Appearance of the power supply unit> Figure 5 shows the external appearance of the power supply unit 100. The power supply unit 100 has multiple connectors 120 arranged in a row. External devices can receive power by connecting to the multiple connectors 120. As explained with reference to Figures 3 and 4, there are two connection methods for connecting to the multiple connectors 120: parallel connection and series connection. To perform parallel or series connection, for example, the wires on the connector or harness of the external device can be branched and connected to the multiple connectors 120.

[0021] Figures 6 and 7 show examples of configurations for connecting to multiple connectors. Figure 6 shows an example of branching wires in a connector or harness, with Figure 6(A) showing an example of branching wires in a connector and Figure 6(B) showing an example of branching wires in a harness.

[0022] In the example shown in Figure 6(A), the harness 202 connected to an external device (not shown) has two connectors 201a and 201b. The wires bundled in the harness 202 are branched at one connector 201a, with one branch connected to the external device and the other to the other connector 201b. By connecting connectors 201a and 201b to two connectors 120 of the power supply unit 100, power is supplied from the two connectors 120 to the external device via connectors 201a, 201b and the harness 202. Note that in Figure 6(A), the connector 120 to which connectors 201a and 201b are connected is not shown.

[0023] In the example shown in Figure 6(B), the harness 202 connected to an external device (not shown) has two connectors 201a and 201b. The harness 202 connected to the external device branches off and is connected to the two connectors 201a and 201b, respectively. By connecting connectors 201a and 201b to the two connectors 120 of the power supply unit 100, power is supplied from the two connectors 120 to the external device via connectors 201a and 201b and the harness 202. Note that in Figure 6(B), the connector 120 to which connectors 201a and 201b are connected is not shown.

[0024] Figure 7 shows an example of branching a wire using an intermediate connector. Figure 7(A) shows an example of a configuration in which the harness is branched at the intermediate connector, and Figure 7(B) shows an example of a configuration in which the wire is branched inside the connector connected to the power supply unit 100.

[0025] In the example shown in Figure 7(A), the relay connector 203 consists of a connector 203A on the power supply unit 100 side and a connector 203B on the external device side. The conductors are branched inside connector 203A and connected to two connectors 201a and 201b via two harnesses 202. Connectors 201a and 201b are connected to two connectors 120 of the power supply unit 100, respectively. Connector 203B can be connected to connector 203A and is connected to an external device (not shown) via harness 202. By connecting connectors 201a and 201b to the two connectors 120 of the power supply unit 100, respectively, and connecting connector 203A and connector 203B, power is supplied to the external device from the two connectors 120. Note that in Figure 7(A), the connector 120 to which connectors 201a and 201b are connected is not shown.

[0026] In the example shown in Figure 7(B), the relay connector 204 consists of a connector 204A on the power supply unit 100 side and a connector 204B on the external equipment side. The connector 204A on the power supply unit 100 side has two connection ports that connect to the two connectors 120 of the power supply unit 100, and one connection port that connects to the connector 204B on the external equipment side. The conductors are branched inside the connector 204A on the power supply unit 100 side and connected to the connection ports on the power supply unit 100 side. The connection ports on the power supply unit 100 side of the connector 204A on the power supply unit 100 side are connected to the two connectors 120 of the power supply unit 100, respectively. The connector 204B on the external equipment side is connected to the connection port on the external equipment side of the connector 204A on the power supply unit 100 side. By connecting connector 204A on the power supply unit 100 to the two connectors 120 on the power supply unit 100, and by connecting connector 204A on the power supply unit 100 to connector 204B on the external device, power is supplied to the external device (not shown) from the two connectors 120. Note that in Figure 7(B), the connector 120 to which connector 204A on the power supply unit 100 is connected is not shown.

[0027] <Power supply unit control method> Figure 8 is a diagram showing the control method of the power supply unit 110 according to the connection configuration of the power supply device 100 to the connector 120. As shown in Figure 8, when multiple connectors 120 are individually connected to multiple external devices, the multiple power supply units 110 corresponding to these multiple connectors 120 are controlled individually (individual operation).

[0028] When multiple connectors 120 are connected in parallel to a single external device, the multiple power supply units 110 corresponding to these multiple connectors 120 are controlled to have the same output voltage (parallel operation).

[0029] When multiple connectors 120 are connected in series to a single external device, the multiple power supply units 110 corresponding to these multiple connectors 120 are controlled so that their output currents are the same (series operation).

[0030] Further explanation will be provided regarding the control of the power supply unit 110 when multiple connectors 120 are connected in parallel to a single external device. When multiple connectors 120 are connected in parallel, it is desirable that the multiple power supply units 110 corresponding to each connector 120 connected to the external device be controlled to ensure equal current distribution. To achieve this, for example, the current values ​​in the parallel-connected connectors 120 can be fed back to the control unit 150 to control the output current of each power supply unit 110.

[0031] Figure 9 shows an example configuration for feeding back the current value of connector 120 to control unit 150. In Figure 9, the output current values ​​of each power supply unit 110A and 110B connected in parallel are fed back to control unit 150. Based on the acquired current value information, control unit 150 controls the output current values ​​of each power supply unit 110A and 110B.

[0032] FIG. 10 is a diagram showing a method for controlling the output current of the power supply unit 110. FIG. 10(A) is a diagram showing the acquisition position of the current value and the control command, and FIG. 10(B) is a diagram showing the method for controlling the current value. As a premise, the output voltage value of the power supply unit 110A is set as V1, the output voltage value of the 100B is set as V2, and the voltage value supplied to the load (external device) 210 is set as V L Then, since they are connected in parallel, both have the same value (V1 = V2 = V L ).

[0033] As shown in FIG. 10(A), let the output current value at the operating point of the power supply unit 110A be I1. Let the output current value at the operating point of the power supply unit 110B be I2. Let the current value supplied to the load (external device) be I L Let the command for controlling the power supply unit 110 to output the current value I be I * As shown in FIG. 10(B), the control unit 150 makes I1 + I2 = I L at V1 = V2 = V L and transmits the current commands I1 * , I2 * to the power supply units 110A and 110B to control the power supply units 110A and 110B.

[0034] By the way, actually, it is difficult to control the output voltages of a plurality of power supply units 110 to be equal. Therefore, a control method can be considered in which the output voltage is controlled only for one power supply unit 110 and the output current is controlled for other power supply units 110.

[0035] FIG. 11 is a diagram showing a method for controlling the output current of the power supply unit 110 when controlling the output voltage for one power supply unit 110. FIG. 11(A) is a diagram showing the acquisition position of the current value and the control command, and FIG. 11(B) is a diagram showing the method for controlling the current value.

[0036] In FIG. 11(A), the current values I1, I2, and current value I L are defined in the same manner as in the example of FIG. 10(A), and the command for controlling the power supply unit 110 to output the current value I is I* In addition, a command is given to control the power supply unit 110 to output a voltage value V. * Let's assume that.

[0037] The control unit 150 issues a voltage command V1 to the power supply unit 110A. * The control unit 150 sends a current command I2 to the power supply unit 110B and performs voltage control on the power supply unit 110A so that the output voltage value becomes V1. * This signal is transmitted, and current control is performed on the power supply unit 110B so that the output current becomes I2.

[0038] When controlled in this way, first, as shown in Figure 11(B), the power supply unit 110B will have an output current of I2 and an output voltage value of V2 (=V1=V L It operates at the operating point where ). Once the operating point of the power supply unit 110B is determined, based on the output current value I2 of the power supply unit 110B, I1 + I2 = I L The output current value I1 of the power supply unit 110A that satisfies this relationship is determined.

[0039] <Determination of parallel connection by the information acquisition unit> Figure 12 shows an example of the configuration of the information acquisition unit 140. The information acquisition unit 140 acquires information to determine whether or not multiple connectors 120 are connected in parallel. The information acquisition unit 140 comprises a detection unit 141 and a determination unit 142. The detection unit 141 detects the terminal voltage of each of the multiple connectors 120 provided on the power supply unit 100. The terminal voltage of each connector 120 is detected at a position between the switch 130 and the connector 120. Based on the detection result by the detection unit 141, the determination unit 142 determines whether or not an external device connected to one of the multiple connectors 120 is connected in parallel with one or more other connectors 120. The determination unit 142 is implemented, for example, by a processor. The control unit 150 can perform a first control that supplies power from one or more power supply units 110 to the connector 120 without supplying power from one or more power supply units 110 to the connector 120. Then, the information acquisition unit 140 determines whether or not these connectors are connected in parallel based on the terminal voltages of the connectors 120 that are not receiving power, which are acquired during the first control.

[0040] The method for determining parallel connection by the determination unit 142 will be explained below with reference to the timing charts in Figures 13 to 15. The timing charts in Figures 13 to 15 show the operating state of the power supply unit 110, the ON / OFF state of the switch 130, and the terminal voltage of the connector 120 for four sets consisting of a power supply unit 110, a connector 120, and a switch 130. In the example shown in Figures 13 to 15, the same numbers 1 to 4 are assigned to distinguish each corresponding power supply unit 110, connector 120, and switch 130 in each set. As shown in Figures 13 to 15, in each set of power supply unit 110, connector 120, and switch 130, when the control unit 150 of the power supply device 100 turns on the switch 130, the power supply device 100 starts up and a terminal voltage is applied to the connector 120. The power supply unit 110 starts up under the control of the control unit 150, and after the output voltage stabilizes, it transitions to steady-state normal operation. In the following explanation, referring to Figures 13 to 15, when distinguishing between sets of power supply unit 110, connector 120, and switch 130, the set numbers shown in Figures 13 to 15 will be used instead of the reference numerals 110, 120, and 130. Specifically, they will be described as power supply unit (1), connector (1), switch (1), etc.

[0041] Figure 13 shows the operation when external devices are individually connected to all connectors 120. As a control to determine whether or not they are connected in parallel, the control unit 150 turns on switches (1) to (4) in sequence with staggered timings. As shown in Figure 13, in sets that include connectors 120 to which external devices are individually connected, the power supply unit 110 starts up and the terminal voltage of the connector 120 rises according to the timing when switch 130 is turned ON. Therefore, the timing when power supply units (1) to (4) start up and the timing when the terminal voltage of connectors (1) to (4) rises are staggered according to the timing when switches (1) to (4) are turned ON.

[0042] In the example shown in Figure 13, switch (1) is turned ON just before time t1, power supply unit (1) starts at time t1, and the terminal voltage of connector (1) rises. At this time, the terminal voltages of connectors (2) to (4) remain constant and do not change. Similarly, switch (2) is turned ON just before time t2, power supply unit (2) starts at time t2, and the terminal voltage of connector (2) rises. At this time, the terminal voltages of connectors (1), (3), and (4) remain constant and do not change. Also, switch (3) is turned ON just before time t3, power supply unit (3) starts at time t3, and the terminal voltage of connector (3) rises. At this time, the terminal voltages of connectors (1), (2), and (4) remain constant and do not change. Also, switch (4) is turned ON just before time t4, power supply unit (4) starts at time t4, and the terminal voltage of connector (4) rises. At this time, the terminal voltages of connectors (1) to (3) are constant and do not change. Based on the above operation, the determination unit 142 determines that external devices are individually connected to all of connectors (1) to (4). Then, the control unit 150 controls each power supply unit (1) to (4) individually based on the determination result of the determination unit 142.

[0043] Figure 14 shows the operation when one external device is connected in parallel to connectors (1) and (2), and separate external devices are individually connected to connectors (3) and (4). Similar to the example shown in Figure 13, the control unit 150 turns on switches (1) to (4) in sequence with staggered timings. As shown in Figure 14, each set of power supply units 110 starts up according to the timing when switch 130 is turned on.

[0044] In contrast, the timing at which the terminal voltage of connector 120 rises differs between connectors (1) and (2), where external devices are connected in parallel, and connectors (3) and (4), where external devices are connected individually. Specifically, for multiple connectors 120 connected in parallel, the terminal voltage of all connectors 120 rises at the moment when a switch 130 corresponding to one of the connectors 120 is turned ON and the power supply unit 110 starts up.

[0045] In the example shown in Figure 14, switch (1) is turned ON just before time t1, power supply unit (1) starts at time t1, and the terminal voltage of connector (1) rises. Also, switch (2) is turned ON just before time t2, and power supply unit (2) starts at time t2. Meanwhile, the terminal voltage of connector (2) rises along with the terminal voltage of connector (1) at the timing (t1) when power supply unit (1) corresponding to connector (1) starts. Note that the terminal voltages of connectors (3) and (4) remain constant and do not change at both timing (t1) and timing (t2).

[0046] The same applies to connectors (3) and (4), to which external devices are individually connected, as in Figure 13. Specifically, switch (3) is turned ON just before time t3, the power supply unit (3) starts at time t3, and the terminal voltage of connector (3) rises. At this time, the terminal voltages of connectors (1), (2), and (4) remain constant and do not change. Similarly, switch (4) is turned ON just before time t4, the power supply unit (4) starts at time t4, and the terminal voltage of connector (4) rises. At this time, the terminal voltages of connectors (1) to (3) remain constant and do not change.

[0047] Based on the above operations, the determination unit 142 determines that one external device is connected in parallel to connectors (1) and (2), and that separate external devices are individually connected to connectors (3) and (4). Then, based on the determination result of the determination unit 142, the control unit 150 controls power supply units (1) and (2) so that their output voltages are the same. The control unit 150 also controls power supply units (3) and (4) individually.

[0048] Figure 15 shows the operation when one external device is connected in parallel to all connectors (1) to (4). Similar to the example shown in Figure 13, the control unit 150 turns on switches (1) to (4) in sequence with staggered timings. As shown in Figure 15, each set of power supply units 110 starts up according to the timing when switch 130 is turned on.

[0049] In contrast, the terminal voltages of each connector 120 to which external devices are connected in parallel rise at the same time. Specifically, when a switch 130 corresponding to one connector 120 is turned ON and the power supply unit 110 starts up, the terminal voltages of all parallel-connected connectors 120 rise.

[0050] In the example shown in Figure 15, switch (1) is turned ON just before time t1, power supply unit (1) starts at time t1, and the terminal voltage of connector (1) rises. Also, switch (2) is turned ON just before time t2, and power supply unit (2) starts at time t2. Also, switch (3) is turned ON just before time t3, and power supply unit (3) starts at time t3. Also, switch (4) is turned ON just before time t4, and power supply unit (4) starts at time t4. Meanwhile, the terminal voltages of connectors (2) to (4) rise along with the terminal voltage of connector (1) at the timing (t1) when power supply unit (1) corresponding to connector (1) starts.

[0051] Based on the above operations, the determination unit 142 determines that one external device is connected in parallel to connectors (1) to (4). Then, the control unit 150 controls the power supply units (1) to (4) so ​​that their output voltages are the same, based on the determination result of the determination unit 142.

[0052] In the examples shown in the timing charts of Figures 13 to 15, the timing of turning on switches (1) to (4) and the timing of starting up power supply units (1) to (4) are staggered. More specifically, in the illustrated examples, the intervals between times t1 and t2, times t2 and t3, and times t3 and t4 are constant. However, these timings are merely examples, and other timings are also possible. For example, in the example shown in Figure 14, the interval between times t1 and t2 may be shorter than the intervals between times t2 and t3, and between times t3 and t4. Also, in the example shown in Figure 15, each of switches (2) to (4) is turned on at a different timing. In contrast, all of switches (2) to (4) may be configured to turn on at the same timing. Also, in the example shown in Figure 15, each of the power supply units (2) to (4) is started at a different timing. In contrast, all of the power supply units (2) to (4) may be configured to start at the same timing.

[0053] <Determination of serial connection by the information acquisition unit> Figure 16 shows an example of the configuration of the information acquisition unit 140. The information acquisition unit 140 acquires information to determine whether or not multiple connectors 120 are connected in series. The information acquisition unit 140 comprises a detection unit 143 and a determination unit 144. The detection unit 143 detects the current flowing through each of the multiple connectors 120 provided on the power supply unit 100. The current of each connector 120 is detected at a position between the switch 130 and the connector 120. Based on the detection result by the detection unit 141, the determination unit 142 determines whether or not an external device connected to one of the multiple connectors 120 is connected in series with one or more other connectors 120. The determination unit 144 is implemented, for example, by a processor. The control unit 150 can perform a second control, which involves supplying power from one or more power supply units 110 to the connector 120 without supplying power from one or more power supply units 110 to the connector 120. Then, the information acquisition unit 140 determines whether or not these connectors are connected in series based on the current flowing through the connector 120 that is not receiving power, which is acquired during the second control.

[0054] Figure 17 shows the current path when multiple connectors 120 are connected in series. Here, we will explain the current path when one of the multiple switches 130 and multiple power supply units 110 corresponding to the multiple connectors 120 connected in series is turned ON, and the power supply unit 110 corresponding to this switch 130 is operating. At this point, the other switches 130 are OFF and the other power supply units 110 are not operating, but because the connectors 120 are connected in series, current flows to the external device 210.

[0055] Figure 17 illustrates, for simplicity, the case where two connectors 120A and 120B are connected in series. Connector 120A is connected to power supply unit 110A via switch 130A. Connector 120B is connected to power supply unit 110B via switch 130B. In addition, on the conductors on the connector 120A and 120B side of switches 130A and 130B, reverse current prevention diodes 171A and 171B are provided on one of the two conductors, and anti-parallel diodes 172A and 172B are provided across the two conductors. Reverse current prevention diodes 171A and 171B are diodes provided to prevent power supply from connectors 120A and 120B to power supply units 110A and 110B. Anti-parallel diodes 172A and 172B are diodes provided to turn ON when a voltage in the opposite direction to the output voltage of power supply units 110A and 110B is applied.

[0056] In Figure 17, switch 130A is ON and switch 130B is OFF. Connector 201a on the external device 210 side is connected to connector 120A of power supply unit 100. Connector 201b on the external device 210 side is connected to connector 120B of power supply unit 100. Connectors 201a and 201b on the external device 210 side are also connected.

[0057] The current output from power supply unit 110A flows through switch 130A, reverse current prevention diode 171A, connector 120A, connector 201a connected to connector 120A, and external device 210. Next, the current from external device 210 flows through connector 201b, connector 120B, anti-parallel diode 172B, connector 120B, connector 201b, connector 201a, connector 120A, switch 130A, and power supply unit 110A. In this way, if switch 130A is ON and power supply unit 110A is operating, current will flow to external device 210 even if switch 130B is OFF and power supply unit 110B is not operating.

[0058] The method for determining series connection by the determination unit 144 will be explained below with reference to the timing charts in Figures 18 to 20. The timing charts in Figures 18 to 20 show the operating state of the power supply unit 110, the ON / OFF state of the switch 130, and the current flowing through the connector 120 for four sets consisting of a power supply unit 110, a connector 120, and a switch 130. In the example shown in Figures 18 to 20, the same numbers 1 to 4 are assigned to distinguish each corresponding power supply unit 110, connector 120, and switch 130 in each set. As shown in Figures 18 to 20, in each set of power supply unit 110, connector 120, and switch 130, when the control unit 150 of the power supply device 100 turns on the switch 130, the power supply device 100 starts up and current flows through the connector 120. The power supply unit 110 starts up under the control of the control unit 150, and after the output current stabilizes, it transitions to steady-state normal operation. In the following explanation, referring to Figures 18 to 20, when distinguishing between sets of power supply unit 110, connector 120, and switch 130, the set numbers shown in Figures 13 to 15 will be used instead of the reference numerals 110, 120, and 130. Specifically, they will be described as power supply unit (1), connector (1), switch (1), etc.

[0059] Figure 18 shows the operation when external devices are individually connected to all connectors 120. As a control to determine whether or not they are connected in series, the control unit 150 turns on switches (1) to (4) in sequence with staggered timings. As shown in Figure 18, in sets that include connectors 120 to which external devices are individually connected, the power supply unit 110 starts up and current begins to flow to the connectors 120 according to the timing when switch 130 is turned ON. Therefore, the timing when power supply units (1) to (4) start up and the timing when current begins to flow to connectors (1) to (4) are staggered according to the timing when switches (1) to (4) are turned ON.

[0060] In the example shown in Figure 18, switch (1) is turned ON just before time t1, power supply unit (1) starts at time t1, and current begins to flow through connector (1). At this time, the current through connectors (2) to (4) is constant and does not change. Similarly, switch (2) is turned ON just before time t2, power supply unit (2) starts at time t2, and current begins to flow through connector (2). At this time, the current through connectors (1), (3), and (4) is constant and does not change. Also, switch (3) is turned ON just before time t3, power supply unit (3) starts at time t3, and current begins to flow through connector (3). At this time, the current through connectors (1), (2), and (4) is constant and does not change. Also, switch (4) is turned ON just before time t4, power supply unit (4) starts at time t4, and current begins to flow through connector (4). At this time, the current through connectors (1) to (3) is constant and does not change. Based on the above operations, the determination unit 144 determines that external devices are individually connected to all of the connectors (1) to (4). Then, the control unit 150 controls each power supply unit (1) to (4) individually based on the determination result of the determination unit 144.

[0061] Figure 19 shows the operation when one external device is connected in series to connectors (1) and (2), and separate external devices are individually connected to connectors (3) and (4). Similar to the example shown in Figure 18, the control unit 150 turns on switches (1) to (4) in sequence with staggered timings. As shown in Figure 19, each set of power supply units 110 starts up according to the timing when switch 130 is turned on.

[0062] In contrast, the timing at which current begins to flow through connector 120 differs between connectors (1) and (2), where external devices are connected in series, and connectors (3) and (4), where external devices are connected individually. Specifically, for multiple connectors 120 connected in series, current begins to flow through all connectors 120 at the moment when a switch 130 corresponding to one of the connectors 120 is turned ON and the power supply unit 110 starts up.

[0063] In the example shown in Figure 19, switch (1) is turned ON just before time t1, power supply unit (1) starts at time t1, and current begins to flow through connector (1). Similarly, switch (2) is turned ON just before time t2, and power supply unit (2) starts at time t2. Meanwhile, current begins to flow through connector (2) at the same timing (t1) as connector (1), when power supply unit (1) corresponding to connector (1) starts. Note that the currents in connectors (3) and (4) remain constant and do not change at both timing (t1) and timing (t2).

[0064] The same applies to connectors (3) and (4), to which external devices are individually connected, as in Figure 18. That is, switch (3) is turned ON just before time t3, the power supply unit (3) starts up at time t3, and current begins to flow through connector (3). At this time, the currents in connectors (1), (2), and (4) are constant and do not change. Also, switch (4) is turned ON just before time t4, the power supply unit (4) starts up at time t4, and current begins to flow through connector (4). At this time, the currents in connectors (1) to (3) are constant and do not change.

[0065] Based on the above operations, the determination unit 144 determines that one external device is connected in series to connectors (1) and (2), and that separate external devices are individually connected to connectors (3) and (4). Then, based on the determination result of the determination unit 144, the control unit 150 controls power supply units (1) and (2) so that their output currents are the same. The control unit 150 also controls power supply units (3) and (4) individually.

[0066] Figure 20 shows the operation when one external device is connected in series to all connectors (1) to (4). Similar to the example shown in Figure 18, the control unit 150 turns on switches (1) to (4) in sequence with staggered timings. As shown in Figure 20, each set of power supply units 110 starts up according to the timing when switch 130 is turned on.

[0067] In contrast, current begins to flow through each of the connectors 120 to which external devices are connected in series, at the same time. Specifically, when a switch 130 corresponding to one connector 120 is turned ON and the power supply unit 110 starts up, current begins to flow through all the series-connected connectors 120.

[0068] In the example shown in Figure 20, switch (1) is turned ON just before time t1, power supply unit (1) starts at time t1, and current begins to flow to connector (1). Also, switch (2) is turned ON just before time t2, and power supply unit (2) starts at time t2. Also, switch (3) is turned ON just before time t3, and power supply unit (3) starts at time t3. Also, switch (4) is turned ON just before time t4, and power supply unit (4) starts at time t4. Meanwhile, current begins to flow through connectors (2) to (4) at the same time (t1) as connector (1) when power supply unit (1) corresponding to connector (1) starts.

[0069] Based on the above operations, the determination unit 142 determines that one external device is connected in series to connectors (1) to (4). Then, the control unit 150 controls the power supply units (1) to (4) so ​​that their output currents are the same, based on the determination result of the determination unit 142.

[0070] In the examples shown in the timing charts of Figures 18 to 20, the timing of turning on switches (1) to (4) and the timing of starting up power supply units (1) to (4) are staggered. More specifically, in the illustrated examples, the intervals between times t1 and t2, t2 and t3, and t3 and t4 are constant. However, these timings are merely examples, and other timings are also possible. For example, in the example shown in Figure 19, the interval between times t1 and t2 may be shorter than the intervals between times t2 and t3, and between times t3 and t4. Also, in the example shown in Figure 20, each of switches (2) to (4) is turned on at a different timing. In contrast, all of switches (2) to (4) may be configured to turn on at the same timing. Also, in the example shown in Figure 20, each of the power supply units (2) to (4) is started at a different timing. In contrast, all of the power supply units (2) to (4) may be configured to start at the same timing.

[0071] In the above explanation, the methods for obtaining parallel connection information based on the terminal voltage of connector 120 and the methods for obtaining series connection information based on the current flowing through connector 120 were described separately. However, in an actual power supply unit 100, in order to determine both parallel and direct connections, the information acquisition unit 140 may be configured to include a detection unit 141 and a determination unit 142 as shown in Figure 12, and a detection unit 143 and a determination unit 144 as shown in Figure 16. Furthermore, the actual power supply unit 100 may be configured to be able to distinguish only parallel connections, or to be able to distinguish only series connections. When series connections can be distinguished, as explained with reference to Figure 1, the power supply unit 110 is configured to supply DC power in only one direction from the power supply unit 110 to the connector 120. The outputs of the multiple power supply units 110 are each electrically isolated. In contrast, when only parallel connections can be distinguished, the power supply unit 110 may be configured to supply DC power bidirectionally between the power supply unit 110 and the connector 120. Furthermore, if only parallel connections are to be distinguishable, the outputs of multiple power supply units 110 may be electrically connected to each other's reference potentials.

[0072] <Other examples of information acquisition methods> In the example described with reference to Figures 12 to 20, it was determined whether or not there were external devices connected in parallel or in series to multiple connectors 120 based on the terminal voltage and current values ​​at connector 120. However, the control unit 150 only needs to identify the connectors 120 that are connected in parallel or in series, and the method for obtaining the information used for such identification is not limited to the method described with reference to Figures 12 to 20. Other methods for identifying the connectors 120 that are connected in parallel or in series will be described below.

[0073] Figure 21 shows an example of a method for acquiring information via communication. The information acquisition method shown in Figure 21 involves communication between a power supply unit 100 and an external device 210, and acquiring connection method information from the external device 210. In the configuration shown in Figure 21, the external device 210 includes a transmitting unit 211. The information acquisition unit 140 of the power supply unit 100 includes a receiving unit 145 corresponding to the transmitting unit 211. The means of communication between the transmitting unit 211 and the receiving unit 145 is not particularly limited. For example, it may be short-range wireless communication such as Bluetooth® or NFC (Near Field Communication), or infrared communication or wired communication may be used.

[0074] In the configuration example shown in Figure 21, the transmitter 211 of the external device 210 is a communication device (transmitter) of a predetermined type. The receiver 145 of the power supply unit 100 is a communication device (receiver) of the same type as the transmitter 211. The transmitter 211 may also be an IC chip capable of transmitting information on the connection method of the external device 210. In this case, the receiver 145 may be a reader capable of reading the information held in the IC chip.

[0075] Figure 22 shows an example of a method for acquiring information based on connector shape. Figure 22(A) shows an example of a connector shape for individual connections, Figure 22(B) shows an example of a connector shape for parallel connections, and Figure 22(C) shows an example of a connector shape for series connections. The information acquisition method shown in Figure 22 is a method for acquiring information that identifies the connection method (individual, parallel, or series) based on the shape of the connector 201, which differs depending on the connection method. In this method, the connector 201 on the external device 210 has different shapes for individual connections, parallel connections, and series connections. However, all types of connectors 201 must be connectable to one of the connectors 120 on the power supply unit 100.

[0076] One example of how this can be implemented is to provide holes for inserting pins in the connector 120 of the power supply unit 100. On the other hand, the connector 201 on the external device 210 side has pins in different positions depending on the type of connection method. The information acquisition unit 140 of the power supply unit 100 then identifies the type of connection method of the connector 201 connected to the connector 120 according to the position of the hole in the connector 120 into which the pin is inserted.

[0077] In the example shown in Figure 22, the connector 120 of the power supply unit 100 is provided with a power supply connection port 121 and an insertion hole 122 for identifying the connection method. The connector 201 on the external device 210 side is provided with a power receiving pin at a position corresponding to the connection port 121 of the connector 120. As shown in Figure 22(A), the connector 201 for individual connection is provided only with a power receiving pin. As shown in Figure 22(B), the connector 201 for parallel connection is provided with a power receiving pin and only one pin that is inserted into the insertion hole 122. As shown in Figure 22(C), the connector 201 for series connection is provided with a power receiving pin and two pins that are inserted into the insertion hole 122.

[0078] When the connector 120 and connector 201, configured as described above, are connected, the manner in which the pins are inserted into the insertion holes 122 of the connector 120 differs depending on the connection method of the external device 210. That is, in the case of individual connections, no pins are inserted into the insertion holes 122. In the case of parallel connections, pins are inserted into only one insertion hole 122. In the case of series connections, pins are inserted into both insertion holes 122. The information acquisition unit 140 determines the connection method of the external device 210 according to the manner in which the pins are inserted into the insertion holes 122 of the connector 120. Note that the shape and pin arrangement of the connectors 120 and 201 are not limited to the example described above with reference to Figure 22. Various shapes and configurations can be adopted as long as the connectors 120 and 201 can be connected and the connection method can be identified.

[0079] Figure 23 shows an example of an information acquisition method using image recognition. The information acquisition method shown in Figure 23 involves equipping the power supply unit 100 with an image acquisition means and acquiring connection method information from an image obtained by photographing the connector 201 on the external device 210 side. In the example shown in Figure 23, a code image (for example, a QR code®) 205 containing the connection method is attached to the connector 120 of the power supply unit 100. In addition, a camera 146 is provided near the connector 120 of the power supply unit 100 as an imaging means.

[0080] When connector 201 is connected to connector 120 of power supply unit 100, camera 146 captures a code image 205 and sends the obtained image to information acquisition unit 140. Information acquisition unit 140 analyzes the acquired image, reads the connection method information recorded in the code image 205, and sends it to control unit 150. In this example, information acquisition unit 140 reads the code image on which the connection method information is recorded, but the method of information extraction by information acquisition unit 140 is not limited to the above example. For example, different predetermined marks may be attached to connector 201 for each type of connection method, and the connection method may be identified according to the type of mark identified from the image captured by camera 146. Alternatively, as explained with reference to Figure 22, the shape and pin arrangement of connector 201 may be different depending on the connection method, and the connector configuration may be identified from the image captured by camera 146 to determine the connection method.

[0081] <Other power supply configuration examples> Figure 24 shows another example configuration of the power supply unit 100. In the example shown in Figure 24, only the AC power supply 300 is shown as the power source. Note that in Figure 24, the information acquisition unit 140 and the control unit 150, etc., are the same as those shown in Figure 1 and are therefore omitted from the description.

[0082] In the configuration example shown in Figure 1, the power supply unit 110 has only a DC / DC converter 111. The power supply device 100 is configured to convert the AC power supplied from the AC power supply 300 into DC power using an AC / DC converter 161, and then distribute it to each power supply unit 110. In contrast, in the configuration shown in Figure 24, each power supply unit 180 is equipped with an AC / DC converter 181 and a DC / DC converter 182. The power supply device 100 is configured to distribute the AC power supplied from the AC power supply 300 to each power supply unit 180 as AC power. Each power supply unit 180 converts the supplied AC power into DC power using an AC / DC converter 181, and then further converts it using a DC / DC converter 182. Each power supply unit 180 then supplies the converted DC power to the connector 120.

[0083] In the power supply unit 100 shown in Figures 1 and 24, each power supply unit may share a circuit board and components, or each power supply unit may be composed of a separate circuit board and components. Alternatively, the power supply unit 100 may be provided with slots into which power supply units can be detachably mounted. With such a configuration, if a failure occurs in an individual power supply unit, it can be easily dealt with by replacing the power supply unit individually. Furthermore, various modifications and alternative configurations that do not deviate from the scope of the technical concept of this disclosure are included in this disclosure.

[0084] <Examples of applications for power supply unit 100> Figure 25 shows an example of the application of the power supply unit 100. The example shown in Figure 25 is an example of an indoor power supply system. In Figure 25, AC power is supplied to the power supply unit 100 from the grid power supply via a power meter 301 and a distribution board 302. DC power is also supplied to the power supply unit 100 from a solar panel power supply 401 via a junction box 402. DC power is also supplied to the power supply unit 100 from a storage battery 501. The power supply unit 100 receives this AC power and DC power, converts it, and supplies DC power to external equipment 210 connected by various connection methods. In Figure 25, examples of external equipment 210 to which power is supplied include a water heater and an outdoor unit of an air conditioner.

[0085] <Effects> The power supply unit 100 of the present disclosure includes a first power supply unit 110 and a second power supply unit 110 capable of supplying DC power and changing the output voltage, a first connector 120 connected to the first power supply unit 110, a second connector 120 connected to the second power supply unit 110, an information acquisition unit 140 that acquires connection information including at least one of the following regarding the external connection status to the first connector 120 and the second connector 120: information that identifies the first connector 120 and the second connector 120 as being connected in series, information that identifies the first connector 120 and the second connector 120 as being connected in parallel, and information that identifies the first connector 120 and the second connector 120 as not being connected, and a control unit 150 that controls the first power supply unit 110 and the second power supply unit 110 based on the connection information. In this case, switching the operation control of the multiple power supply units 110 can be easily implemented according to the external connection status to the multiple connectors 120 corresponding to the multiple power supply units 110. Here, if the connection information identifies that the first connector 120 and the second connector 120 are connected in series, the control unit 150 controls the first power supply unit 110 and the second power supply unit 110 so that the output current of the first power supply unit 110 and the output current of the second power supply unit 110 are the same. In this case, appropriate operation control can be performed for the power supply units 110 corresponding to a plurality of externally connected connectors 120 in series. Furthermore, if the connection information identifies that the first connector 120 and the second connector 120 are connected in parallel, the control unit 150 controls the first power supply unit 110 and the second power supply unit 110 so that the output voltage of the first power supply unit 110 and the output voltage of the second power supply unit 110 are the same. In this case, appropriate operation control can be performed for the power supply units 110 corresponding to a plurality of externally connected connectors 120 in parallel. Furthermore, if the connection information indicates that the first connector 120 and the second connector 120 are not connected, the control unit 150 controls the first power supply unit 110 and the second power supply unit 110 individually. In this case, appropriate operation control can be performed for the power supply units 110 corresponding to a plurality of externally connected connectors 120. Furthermore, the control unit 150 is capable of performing a first control in which power is supplied from the first power supply unit 110 to the first connector 120 without supplying power from the second power supply unit 110 to the second connector 120. The information acquisition unit 140 includes a detection unit 141 that detects the voltage of the second connector 120, and a determination unit 142 that, during the first control, determines whether the first connector 120 and the second connector 120 are connected in parallel based on the voltage value detected by the detection unit 141. In this case, appropriate operation control can be performed on the power supply unit 110 according to the external connection status to a plurality of connectors 120, which are identified based on the voltage detection result of the connector 120. Furthermore, the control unit 150 is capable of performing a first control in which power is supplied from the first power supply unit 110 to the first connector 120 without supplying power from the second power supply unit 110 to the second connector 120. The information acquisition unit 140 includes a detection unit 143 for detecting the current of the second connector 120, and a determination unit 142 for determining whether the first connector 120 and the second connector 120 are connected in series based on the current value detected by the detection unit 143 during the second control. In this case, appropriate operation control can be performed on the power supply unit 110 according to the external connection status to a plurality of connectors 120, which is identified based on the voltage detection result of the connector 120. Furthermore, the power supply device 100 of this disclosure further comprises a DC / DC converter 162 connectable to a DC power supply 400, an AC / DC converter 161 connectable to an AC power supply 300, and a DC bus 190 connecting the DC / DC converter 162 and the AC / DC converter 161. The first power supply unit 110 is connected to the DC bus 190 and can convert the DC power of the DC bus 190 into power and supply it to the first connector 120. The second power supply unit 110 is connected to the DC bus 190 and can convert the DC power of the DC bus 190 into power and supply it to the second connector 120. In this case, switching the operation control of the multiple power supply units 110 can be easily implemented depending on the external connection status to the multiple connectors 120 corresponding to the multiple power supply units 110.

[0086] Although embodiments have been described above, the technical scope of this disclosure is not limited to the embodiments described above. It is clear from the claims that combinations of two or more of the above embodiments, as well as various modifications or improvements to the above embodiments, are also included in the technical scope of this disclosure. [Explanation of Symbols]

[0087] 100...Power supply unit, 110...Power supply unit, 111...DC / DC converter, 120...Connector, 130...Switch, 140...Information acquisition unit, 150...Control unit, 161...AC / DC converter, 162...DC / DC converter, 180...Power supply unit, 181...AC / DC converter, 182...DC / DC converter

Claims

1. A first power supply unit and a second power supply unit capable of supplying DC power and having a changeable output voltage, A first connector connected to the first power supply unit, A second connector connected to the second power supply unit, Regarding the external connection status to the first connector and the second connector, an acquisition means for acquiring connection information that includes at least one of the following: information that identifies the first connector and the second connector as being connected in series, information that identifies the first connector and the second connector as being connected in parallel, and information that identifies the first connector and the second connector as not being connected. A control unit that controls the first power supply unit and the second power supply unit based on the aforementioned connection information, A power supply unit equipped with the following features.

2. The power supply device according to claim 1, wherein the control unit controls the first power supply unit and the second power supply unit so that the output current of the first power supply unit and the output current of the second power supply unit are the same when the connection information is information that identifies the first connector and the second connector as being connected in series.

3. The power supply device according to claim 1, wherein the control unit controls the first power supply unit and the second power supply unit so that the output voltage of the first power supply unit and the output voltage of the second power supply unit are the same when the connection information is information that identifies the first connector and the second connector as being connected in parallel.

4. The power supply device according to claim 1, wherein the control unit individually controls the first power supply unit and the second power supply unit when the connection information indicates that the first connector and the second connector are not connected.

5. The control unit is capable of performing a first control, which involves supplying power from the first power supply unit to the first connector without supplying power from the second power supply unit to the second connector. The acquisition means is, Voltage detection means for detecting the voltage of the second connector, During the first control, a determination means determines whether the first connector and the second connector are connected in parallel based on the voltage value detected by the voltage detection means, A power supply device according to claim 1 or claim 3, comprising:

6. The control unit is capable of performing a second control, which involves supplying power from the first power supply unit to the first connector without supplying power from the second power supply unit to the second connector. The acquisition means is, Current detection means for detecting the current in the second connector, During the second control, a determination means determines whether the first connector and the second connector are connected in series based on the current value detected by the current detection means, A power supply device according to claim 1 or claim 2, comprising:

7. A converter circuit that can be connected to a DC power supply, An inverter circuit that can be connected to an AC power supply, The system further comprises a DC bus connecting the converter circuit and the inverter circuit, The first power supply unit is connected to the DC bus and is capable of converting the DC power of the DC bus into power and supplying it to the first connector. The second power supply unit is connected to the DC bus and is capable of converting the DC power of the DC bus into power and supplying it to the second connector. A power supply device according to any one of claims 1 to 4.

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