Power supply device

Abstract

The invention provides a power supply device which can more appropriately detect abnormality of a current path. In a power supply device, a system main relay, a charging relay, a series connection relay, a parallel connection relay, a first neutral point relay, and a second neutral point relay are controlled so that both a first capacitor and a second capacitor are pre-charged. The presence or absence of an abnormality in a first current path for charging the first capacitor is detected on the basis of the voltage of the first capacitor, and the presence or absence of an abnormality in a second current path for charging the second capacitor is detected on the basis of the voltage of the second capacitor.

Description

Technical Field

[0001] The present disclosure relates to a power supply device. Background Art

[0002] In the past, a power supply device that supplies power to an inverter and a converter has been proposed (for example, refer to Japanese Patent Publication No. 2014-87156). The power supply device includes a first power storage device, a second power storage device, a motor, an inverter, a converter, a first relay, a second relay, a first capacitor, a second capacitor, and a DC charging device. The second power storage device is connected to the inverter in parallel with the converter and the first power storage device. The inverter drives the motor. The converter supplies power from the first power storage device to the inverter along with voltage conversion. The first relay is installed on the first power line connecting the first power storage device and the converter. The second relay is installed on the second power line connecting the second power storage device and the inverter. The first capacitor is connected to the side of the first power line that is closer to the converter than the first relay. The second capacitor is connected to the power line of the inverter. The DC charging device is connected to the side of the second power line that is closer to the second power storage device than the second relay. The DC charging device supplies external DC power supplied from the external charging connector to the second power line. The power supply device turns off the first relay and turns on the second relay, and detects the failure of the second relay based on the voltage of the second capacitor. After the failure of the second relay is detected, the first relay is turned on, and the failure of the first relay is detected based on the voltage of the first capacitor. Summary of the invention

[0003] Problem that the invention aims to solve

[0004] Incidentally, in recent years, a power supply device capable of switching between a case where the first power storage unit and the second power storage unit are connected in series and a case where the first power storage unit and the second power storage unit are connected in parallel has been proposed. The power supply device includes a DC charging device, and the DC charging device includes a charging power line, a charging relay, a series connection line, a series connection relay, a parallel connection line, a parallel connection relay, a neutral point line, a first neutral point relay, a second neutral point relay, and a second capacitor. The charging power line connects an external charging connector, a system main relay of the power line, and an inverter. The charging relay is installed on the charging power line. The series connection line connects the first power storage unit and the second power storage unit in series. The series connection relay is installed on the series connection line. The parallel connection line connects the side of the series connection line closer to the first power storage unit than the series connection relay to the side of the negative side line of the power line closer to the second power storage unit than the negative side relay and the pre-charging relay. The parallel connection relay is installed on the parallel connection line. The neutral point line connects the neutral point of the three-phase AC motor to the side of the series connection line closer to the second power storage unit than the series connection relay. The first neutral point relay is installed on the neutral point line. The second neutral point relay is installed on the side of the neutral point line closer to the second power storage unit than the first neutral point relay. The second capacitor is installed between the first neutral point relay and the second neutral point relay on the neutral point line and on the side of the negative side line of the power line closer to the inverter than the negative side relay. In this power supply device, it is desired to more appropriately detect abnormalities in the current path.

[0005] A main purpose of the power supply device of the present disclosure is to more appropriately detect abnormality in a current path.

[0006] Solutions for solving problems

[0007] The power supply device of the present disclosure adopts the following means to achieve the above-mentioned main object.

[0008] The power supply device disclosed herein is a power supply device that supplies power to an inverter having a plurality of switching elements and diodes connected in reverse parallel to the switching elements, and drives a three-phase AC motor. The gist of the power supply device is that the power supply device comprises:

[0009] A power storage device having a first power storage unit and a second power storage unit;

[0010] a system main relay having a positive-side relay, a negative-side relay, and a pre-charging circuit, wherein the positive-side relay is mounted on a positive-side line of a power line connecting the power storage device and the inverter, the negative-side relay is mounted on a negative-side line of the power line, and the pre-charging circuit has a pre-charging resistor and a pre-charging relay connected in series in a manner bypassing the negative-side relay;

[0011] a first capacitor installed on the power line;

[0012] A DC charging device, comprising a charging power line, a charging relay, a series connection line, a series connection relay, a parallel connection line, a parallel connection relay, a neutral point line, a first neutral point relay, a second neutral point relay, and a second capacitor, wherein the charging power line connects an external charging connector for supplying external DC power and the system main relay of the power line and the inverter, the charging relay is installed on the charging power line, the series connection line connects the first power storage unit and the second power storage unit in series, the series connection relay is installed on the series connection line, and the parallel connection line connects the side of the series connection line closer to the first power storage unit than the series connection relay to the negative side line of the power line closer to the negative side relay and the second capacitor. a precharge circuit connected to a side closer to the second power storage unit, the parallel connection relay is installed on the parallel connection line, the neutral point line connects the neutral point of the three-phase AC motor to the side of the series connection line closer to the second power storage unit than the series connection relay, the first neutral point relay is installed on the neutral point line, the second neutral point relay is installed on the side of the neutral point line closer to the second power storage unit than the first neutral point relay, the second capacitor is installed between the first neutral point relay and the second neutral point relay of the neutral point line and on the side of the negative side line of the power line closer to the inverter than the negative side relay and the precharge circuit, and the DC charging device charges the power storage device using the external DC power; and

[0013] The control device controls the system main relay, the charging relay, the series connection relay, the parallel connection relay, the first neutral point relay, and the second neutral point relay in such a manner that the first capacitor and the second capacitor are both precharged, and detects whether there is an abnormality in a first current path for charging the first capacitor based on a voltage of the first capacitor, and detects whether there is an abnormality in a second current path for charging the second capacitor based on a voltage of the second capacitor.

[0014] In the power supply device of the present disclosure, the control device controls the system main relay, the charging relay, the series connection relay, the parallel connection relay, the first neutral point relay, and the second neutral point relay in such a manner that both the first capacitor and the second capacitor are precharged, and detects whether there is an abnormality in the first current path for charging the first capacitor based on the voltage of the first capacitor, and detects whether there is an abnormality in the second current path for charging the second capacitor based on the voltage of the second capacitor. As a result, the power supply device of the present disclosure can more appropriately detect abnormalities in the current paths.

[0015] In such a power supply device of the present disclosure, the control device may turn on the positive-side relay, the pre-charging relay, the parallel connection relay, and the second neutral point relay of the system main relay, and turn off the negative-side relay, the charging relay, the series connection relay, and the first neutral point relay of the system main relay in such a manner that both the first capacitor and the second capacitor are pre-charged. Thus, the control device can set the first current path as a path that returns from the first battery via the positive-side line of the power line, the first capacitor, the negative-side line of the power line, and the parallel connection line to the first battery. In addition, the control device can set the second current path as a path that returns from the second battery via the neutral point line, the second capacitor, and the negative-side line of the power line to the second battery.

[0016] In addition, in the power supply device of the present disclosure, the control device may control the system main relay, the charging relay, the series connection relay, the parallel connection relay, the first neutral point relay, and the second neutral point relay in such a manner that both the first capacitor and the second capacitor are precharged when the external power supply that supplies the external DC power is connected to the external charging connector, and detects whether the first current path has an abnormality based on the voltage of the first capacitor, and detects whether the second current path has an abnormality based on the voltage of the second capacitor. In this way, the power supply device of the present disclosure can detect whether the first current path and the second current path have an abnormality when the external power supply that supplies the external DC power is connected to the external charging connector. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 1 is a schematic structural diagram showing the structure of the power supply device 20 according to the present embodiment.

[0018] Figure 2 1 is a flowchart showing an example of a post-connection processing routine executed by the control device 60 .

[0019] Figure 3 It is an explanatory diagram for explaining the current path in the power supply device 20 when step S110 is executed.

[0020] Figure 4 It is an explanatory diagram for explaining the third current path Pc3.

[0021] Figure 5 It is an explanatory diagram for explaining the fourth current path Pc4. DETAILED DESCRIPTION

[0022] Embodiments of the present disclosure will be described with reference to the drawings. Figure 11 is a schematic structural diagram showing the structure of the power supply device 20 of the present embodiment. The power supply device 20 of the embodiment is configured as a device that supplies power to the inverter 24 that drives the motor 22. The power supply device 20 includes a battery 26 as a power storage device, a system main relay 28, a first capacitor 34, a DC charging device 40, and a control device 60.

[0023] The motor 22 is configured as a known three-phase AC motor having a rotor with a permanent magnet attached to the outer surface and a stator with a three-phase coil wound thereon, for example. The inverter 24 is composed of six transistors T1 to T6 as switching elements and six diodes D1 to D6 connected in reverse parallel to the transistors T1 to T6. The transistors T1 to T6 are arranged in pairs of two each so as to be the source side and the drain side relative to the positive bus and the negative bus shared by the inverter 24 as the power line 30. The connection points between the paired transistors of the transistors T1 to T6 are connected to the respective phases of the three-phase coils (U phase, V phase, W phase) of the motor 22. When a voltage is applied between the positive bus and the negative bus, the inverter 24 controls the ratio of the conduction time of the paired transistors T1 to T6 to form a rotating magnetic field in the three-phase coils, thereby rotating and driving the motor 22. The first capacitor 34 for smoothing is connected to the power line 30.

[0024] The battery 26 includes a first battery 26a as a first power storage unit and a second battery 26b as a second power storage unit having a capacity n times ("n" is an integer) that of the first battery 26a, and is connected to the power line 30. The first battery 26a and the second battery 26b are configured as lithium ion secondary batteries or nickel-hydrogen secondary batteries, for example.

[0025] The system main relay 28 is connected to the power line 30. The system main relay 28 includes a positive-side relay SMRB, a negative-side relay SMRG, and a precharge circuit. The positive-side relay SMRB is installed on the positive-side line 30B of the power line 30. The negative-side relay SMRG is installed on the negative-side line 30G of the power line 30. The precharge circuit is connected in series with a precharge resistor R and a precharge relay SMRP in a manner that bypasses the negative-side relay SMRG.

[0026] The DC charging device 40 includes an external charging connector 42, a charging power line 43, a charging relay 44, a series connection line 45, a series connection relay DCR, a parallel connection line 46, a parallel connection relay DCRNG, a neutral point line 47, a first neutral point relay DCRN, a second neutral point relay DCRNB, and a second capacitor 48. The external charging connector 42 is connected to an external DC power source and supplies DC power (external DC power) from the outside. The charging power line 43 is connected to the external charging connector 42 and is connected between the system main relay 28 of the power line 30 and the inverter 24. The charging relay 44 is installed on the charging power line 43. The series connection line 45 connects the first battery 26a and the second battery 26b in series. The series connection relay DCR is installed on the series connection line 45. The parallel connection line 46 connects the side of the series connection line 45 closer to the first battery 26a than the series connection relay DCR to the side of the negative side line 30G of the power line 30 closer to the second battery 26b than the negative side relay SMRG and the precharge circuit. The parallel connection relay DCRNG is installed on the parallel connection line 46. The neutral point line 47 connects the neutral point of the motor 22 to the side of the series connection line 45 closer to the second battery 26b than the series connection relay DCR. The first neutral point relay DCRN is installed on the neutral point line 47. The second neutral point relay DCRNB is installed on the neutral point line 47 closer to the second battery 26b than the first neutral point relay DCRN. The second capacitor 48 is installed between the first neutral point relay DCRN and the second neutral point relay DCRNB of the neutral point line 47 and on the negative electrode side line 30G of the power line 30 closer to the inverter 24 than the negative electrode side relay SMRG and the precharge circuit.

[0027] Although not shown, the control device 60 is configured as a microprocessor centered around a CPU, and in addition to the CPU, it also includes a ROM for storing a processing program, a RAM for temporarily storing data, a flash memory, an input / output port, a communication port, and the like. Signals from various sensors are input to the control device 60 via the input port. As the signals input to the control device 60, for example, the rotation position θm from the rotation position detection sensor (e.g., a rotary transformer) 23 for detecting the rotation position of the rotor of the motor 22, the phase current flowing through the three-phase coil (U phase, V phase, W phase) of the motor 22, the voltage VH from the voltage sensor 34a for detecting the voltage of the first capacitor 34, and the voltage VL from the voltage sensor 48a for detecting the voltage of the second capacitor 48 can be listed. In addition, the control device 60 is also connected to a communication line for communicating with an external power source via the external charging connector 42.

[0028] Various control signals are outputted from the control device 60 via the output port. Examples of the signals outputted from the control device 60 include switch control signals to the transistors T1 to T6 of the inverter 24, drive control signals to the system main relay 28, drive control signals to the charging relay 44, drive control signals to the series connection relay DCR, drive control signals to the parallel connection relay DCRNG, drive control signals to the first neutral point relay DCRN, and drive control signals to the second neutral point relay DCRNB.

[0029] When an external power source is connected to the external charging connector 42 of the DC charging device 40, the control device 60 inputs the voltage Vd of the DC power supplied by the external power source (external DC voltage Vd). The battery 26 is charged by the first charging of the DC charging device 40 when the external DC voltage Vd is the rated voltage V1 of the battery 26 in the state where the first battery 26a and the second battery 26b are connected in series, and is charged by the second charging of the DC charging device 40 when the external DC voltage Vd is n times the rated voltage V1 ("n" is a positive value less than 1). In the first charging, the control device 60 turns on the system main relay 28, the charging relay 44, and the series connection relay DCR, and turns off the parallel connection relay DCRNG and the first neutral point relay DCRN and the second neutral point relay DCRNB. Therefore, in the first charging, the battery 26 is charged using the charging power line 43, the power line 30, and the series connection line 45 in the state where the first battery 26a and the second battery 26b are connected in series. In the second charging, the control device 60 turns on the positive-side relay SMRB of the system main relay 28, the charging relay 44, the parallel connection relay DCRNG, the first neutral point relay DCRN, and the second neutral point relay DCRNB, and turns off the negative-side relay SMRG, the pre-charging relay SMRP, and the series connection relay DCR of the system main relay 28. Therefore, in the second charging, the first battery 26a and the second battery 26b are connected in parallel. In addition, the first battery 26a is charged by a current path that returns from the positive-side line of the charging power line 43 via the positive-side line 30B of the power line 30, the first battery 26a, the parallel connection line 46, and the negative-side line 30G of the power line 30 to the negative-side line of the charging power line 43. The second battery 26b is charged by a current path that returns from the positive side line of the charging power line 43 via the positive side line 30B of the power line 30, any one of the diodes D1 to D3 of the inverter 24, the motor 22, the neutral point line 47, the second battery 26b, and the negative side line 30G of the power line 30 to the negative side line of the charging power line 43.

[0030] Next, the operation of the power supply device 20 configured as above, particularly the operation when the first charging or the second charging of the battery 26 is started by the DC charging device 40 will be described. Figure 2 1 is a flowchart showing an example of a post-connection processing routine executed by the control device 60. The control device 60 executes this routine after the external power source is connected to the external charging connector 42. It should be noted that before executing this routine, the system main relay 28, the charging relay 44, the series connection relay DCR, the parallel connection relay DCRNG, the first neutral point relay DCRN, and the second neutral point relay DCRNB are all turned off.

[0031] When executing this routine, control device 60 turns on parallel connection relay DCRNG, positive-side relay SMRB of system main relay 28, and second neutral point relay DCRNB (step S100). Next, control device 60 turns on precharge relay SMRP of system main relay 28 (step S110). Figure 3 2 is an explanatory diagram for explaining the current path in the power supply device 20 when step S110 is executed. Figure 3 In FIG. 1 , the thick solid line indicates the outline of the first current path Pc1. The thick dotted line indicates the outline of the second current path Pc2. The first current path Pc1 is a path from the first battery 26a via the positive side line 30B of the power line 30, the first capacitor 34, the negative side line 30G of the power line 30, and the parallel connection line 46 to the first battery 26a. When there is no abnormality such as disconnection in the first current path Pc1, the first capacitor 34 is precharged (charged) by the current flowing in the first current path Pc1, and the voltage VH rises. The second current path Pc2 is a path from the second battery 26b via the neutral point line 47, the second capacitor 48, and the negative side line 30G of the power line 30 to the second battery 26b. When there is no abnormality such as disconnection in the second current path Pc2, the second capacitor 48 is precharged (charged) by the current flowing in the second current path Pc2, and the voltage VL rises.

[0032] Next, the control device 60 inputs the voltage VH from the voltage sensor 34a and the voltage VL from the voltage sensor 48a (step S120). Then, the control device 60 determines whether the voltage VH is less than the threshold value Vref1 (step S130). The threshold value Vref1 is a threshold value for determining whether an abnormality such as a disconnection that makes it impossible to charge the first capacitor 34 occurs in the first current path Pc1. The threshold value Vref1 can be set to a value slightly larger than 0, such as 3V, 5V, 8V, etc. When the voltage VH is higher than the threshold value Vref1 in step S130, the control device 60 determines that no abnormality occurs in the first current path Pc1 (step S140).

[0033] Then, the control device 60 further determines whether the voltage VL is less than the threshold value Vref2 (step S150). The threshold value Vref2 is a threshold value for determining whether an abnormality such as a disconnection that makes it impossible to charge the second capacitor 48 has occurred in the second current path Pc2. The threshold value Vref2 can be set to a value slightly larger than 0, such as 3V, 5V, 8V, etc. When the voltage VL is higher than the threshold value Vref2 in step S150, the control device 60 determines that no abnormality has occurred in the second current path Pc2 (step S160).

[0034] When no abnormality occurs in the first current path Pc1 and the second current path Pc2, the control device 60 turns on the negative-side relay SMRG of the system main relay 28 (step S170), turns off the pre-charging relay SMRP of the system main relay 28 (step S180), and turns on the first neutral point relay DCRN (step S190). Then, the control device 60 performs the first charging or the second charging (step S200), and ends this routine.

[0035] When voltage VH is equal to or lower than threshold value Vref1 in step S130, control device 60 determines that an abnormality has occurred in first current path Pc1 (step S210), does not perform first charging and second charging, and ends this routine.

[0036] When the voltage VL is less than the threshold value Vref2 in step S150, the control device 60 determines that an abnormality has occurred in the second current path Pc2 (step S220), does not perform the first charging and the second charging, and ends the routine. In this way, in the power supply device 20 of the present embodiment, the presence or absence of an abnormality in the first current path Pc1 for charging the first capacitor 34 is detected based on the voltage VH of the first capacitor 34, and the presence or absence of an abnormality in the second current path Pc2 for charging the second capacitor 48 is detected based on the voltage VL of the second capacitor 48. As a result, the abnormality of the current path can be detected more appropriately.

[0037] In the power supply device 20 of the present embodiment described above, the control device 60 controls the system main relay 28, the charging relay 44, the series connection relay DCR, the parallel connection relay DCRNG, the first neutral point relay DCRNB in ​​a manner that the first capacitor 34 and the second capacitor 48 are both pre-charged, and detects whether there is any abnormality in the first current path Pc1 for charging the first capacitor 34 based on the voltage VH of the first capacitor 34, and detects whether there is any abnormality in the second current path Pc2 for charging the second capacitor 48 based on the voltage VL of the second capacitor 48. As a result, the power supply device 20 can more appropriately detect abnormalities in the current paths.

[0038] In addition, the control device 60 turns on the positive-side relay SMRB, the precharge relay SMRP, the parallel connection relay DCRNG, and the second neutral point relay DCRNB of the system main relay 28, and turns off the negative-side relay SMRG, the charging relay 44, the series connection relay DCR, and the first neutral point relay DCRN of the system main relay 28 so that both the first capacitor 34 and the second capacitor 48 are precharged. Thus, the control device 60 can set the first current path Pc1 as a path that returns from the first battery 26a via the positive-side line 30B of the power line 30, the first capacitor 34, the negative-side line 30G of the power line 30, and the parallel connection line 46 to the first battery 26a. In addition, the control device 60 can set the second current path Pc2 as a path that returns from the second battery 26b via the neutral point line 47, the second capacitor 48, and the negative-side line 30G of the power line 30 to the second battery 26b.

[0039] Furthermore, when the external power source is connected to the external charging connector 42, the control device 60 controls the system main relay 28, the charging relay 44, the series connection relay DCR, the parallel connection relay DCRNG, the first neutral point relay DCRN, and the second neutral point relay DCRNB so that both the first capacitor 34 and the second capacitor 48 are precharged, and detects whether there is an abnormality in the first current path Pc1 based on the voltage VH of the first capacitor 34, and detects whether there is an abnormality in the second current path Pc2 based on the voltage VL of the second capacitor 48. Thus, when the external power source is connected to the external charging connector 42, the power supply device 20 can detect whether there is an abnormality in the first current path Pc1 and the second current path Pc2.

[0040] In the above-mentioned embodiment, the control device 60 turns on the positive-side relay SMRB of the system main relay 28, the pre-charging relay SMRP, the parallel connection relay DCRNG, and the second neutral point relay DCRNB, and turns off the negative-side relay SMRG of the system main relay 28, the charging relay 44, the series connection relay DCR, and the first neutral point relay DCRN, and pre-charges the first capacitor 34 and the second capacitor 48 together. However, the first capacitor 34 and the second capacitor 48 may be pre-charged together by other methods. In this case, the control device 60 first turns on the parallel connection relay DCRNG, the positive-side relay SMRB of the system main relay 28, and the first neutral point relay DCRN. Next, the control device 60 turns on the pre-charging relay SMRP of the system main relay 28. Through this process, a current flows through the third current path Pc3 to pre-charge the first capacitor 34. Figure 4The third current path Pc3 is a path from the first battery 26a via the positive electrode side line 30B of the power line 30, the first capacitor 34, the negative electrode side line 30G of the power line 30, and the parallel connection line 46 back to the first battery 26a.

[0041] Next, the control device 60 inputs the voltage VH from the voltage sensor 34a, and determines whether the voltage VH is less than the threshold value Vref1 through the same processing as step S130. When the voltage VH is less than the threshold value Vref1, the control device 60 determines that an abnormality such as a disconnection has occurred in the third current path Pc3, and ends the processing. When the voltage VH exceeds the threshold value Vref1, the control device 60 determines that an abnormality such as a disconnection has not occurred in the third current path Pc3.

[0042] When the control device 60 determines that no abnormality such as disconnection has occurred in the third current path Pc3, the control device 60 turns on the second neutral point relay DCRNB. Through this process, a current flows through the fourth current path Pc4, and the second capacitor 48 is precharged. Figure 5 This is an explanatory diagram for explaining the fourth current path Pc4. Since the first capacitor 34 has been precharged, the diodes D1 to D3 of the inverter 24 are applied with a reverse bias voltage, and the current does not flow to the neutral point line 47 via the diodes D1 to D3 and the motor 22. Therefore, the fourth current path Pc4 becomes a path from the second battery 26b via the neutral point line 47, the second capacitor 48, and the negative side line 30G of the power line 30 to return to the second battery 26b.

[0043] Next, the control device 60 inputs the voltage VL from the voltage sensor 48a, and determines whether the voltage VL is less than the threshold value Vref2 through the same processing as step S150. When the voltage VL is less than the threshold value Vref2, the control device 60 determines that an abnormality such as a disconnection has occurred in the fourth current path Pc4, and ends the processing. When the voltage VL exceeds the threshold value Vref2, the control device 60 determines that an abnormality such as a disconnection has not occurred in the fourth current path Pc4, performs the first charge or the second charge, and ends the processing. As a result, the power supply device 20 can more appropriately detect abnormalities in the current path.

[0044] In the above-described embodiment, when the external power source is connected to the external charging connector 42, the control device 60 executes Figure 2 However, the control device 60 performs Figure 2 The illustrated processing is not limited to when the external power source is connected to the external charging connector 42 , and may be performed at any time as long as the first capacitor 34 and the second capacitor 48 need to be precharged.

[0045] In the above-described embodiment, the power supply device 20 includes the battery 26 including the first battery 26a and the second battery 26b. However, at least one of the first battery 26a and the second battery 26b may be a capacitor.

[0046] The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of the specific embodiment is explained. In the embodiment, the first battery 26a is equivalent to the "first power storage unit", the second battery 26b is equivalent to the "second power storage unit", the battery 26 is equivalent to the "power storage device", the positive side relay SMRB is equivalent to the "positive side relay", the negative side relay SMRG is equivalent to the "negative side relay", the pre-charging resistor R is equivalent to the "pre-charging resistor", the pre-charging relay SMRP is equivalent to the "pre-charging relay", the system main relay 28 is equivalent to the "system main relay", the first capacitor 34 is equivalent to the "first capacitor", the charging power line 43 is equivalent to the "charging power line", and the charging relay 44 is equivalent to the "charging relay". Electrical appliance", series connection wire 45 is equivalent to "series connection wire", series connection relay DCR is equivalent to "series connection relay", parallel connection wire 46 is equivalent to "parallel connection wire", parallel connection relay DCRNG is equivalent to "parallel connection relay", neutral point line 47 is equivalent to "neutral point line", first neutral point relay DCRN is equivalent to "first neutral point relay", second neutral point relay DCRNB is equivalent to "second neutral point relay", second capacitor 48 is equivalent to "second capacitor", DC charging device 40 is equivalent to "DC charging device", and control device 60 is equivalent to "control device".

[0047] It should be noted that the correspondence between the main elements of the embodiment and the main elements of the invention recorded in the column of the specific embodiment is an example of a way for the embodiment to implement the invention recorded in the column of the specific embodiment, and therefore does not limit the elements of the invention recorded in the column of the specific embodiment. That is, the interpretation of the invention recorded in the column of the specific embodiment should be based on the description in the column, and the embodiment is only a specific example of the invention recorded in the column of the specific embodiment.

[0048] As mentioned above, although the embodiment for implementing this disclosure was described, this disclosure is not limited to such embodiment at all, and it is needless to say that this disclosure can be implemented in various forms within the scope not departing from the gist of this disclosure.

[0049] Industrial Applicability

[0050] The present disclosure can be utilized in the power supply device manufacturing industry and the like.

Claims

1. A power supply device for supplying power to an inverter having a plurality of switching elements and diodes connected in reverse parallel to the switching elements, and driving a three-phase AC motor, wherein: The power supply unit has: A power storage device having a first power storage unit and a second power storage unit; a system main relay having a positive-side relay, a negative-side relay, and a pre-charging circuit, wherein the positive-side relay is mounted on a positive-side line of a power line connecting the power storage device and the inverter, the negative-side relay is mounted on a negative-side line of the power line, and the pre-charging circuit has a pre-charging resistor and a pre-charging relay connected in series in a manner bypassing the negative-side relay; a first capacitor installed on the power line; A DC charging device, comprising a charging power line, a charging relay, a series connection line, a series connection relay, a parallel connection line, a parallel connection relay, a neutral point line, a first neutral point relay, a second neutral point relay, and a second capacitor, wherein the charging power line connects an external charging connector for supplying external DC power and the system main relay of the power line and the inverter, the charging relay is installed on the charging power line, the series connection line connects the first power storage unit and the second power storage unit in series, the series connection relay is installed on the series connection line, and the parallel connection line connects the side of the series connection line closer to the first power storage unit than the series connection relay and the negative side line of the power line closer than the negative side relay and the second capacitor. The pre-charging circuit is connected to a side close to the second power storage unit, the parallel connection relay is installed on the parallel connection line, the neutral point line connects the neutral point of the three-phase AC motor to the side of the series connection line closer to the second power storage unit than the series connection relay, the first neutral point relay is installed on the neutral point line, the second neutral point relay is installed on the side of the neutral point line closer to the second power storage unit than the first neutral point relay, the second capacitor is installed between the first neutral point relay and the second neutral point relay of the neutral point line and on the side of the negative side line of the power line closer to the inverter than the negative side relay and the pre-charging circuit, and the DC charging device uses the external DC power to charge the power storage device; as well as The control device controls the system main relay, the charging relay, the series connection relay, the parallel connection relay, the first neutral point relay, and the second neutral point relay in such a manner that the first capacitor and the second capacitor are both precharged, and detects whether there is an abnormality in a first current path for charging the first capacitor based on a voltage of the first capacitor, and detects whether there is an abnormality in a second current path for charging the second capacitor based on a voltage of the second capacitor.

2. The power supply device according to claim 1, wherein: The control device turns on the positive-side relay, the precharging relay, the parallel connection relay, and the second neutral point relay of the system main relay, and turns off the negative-side relay, the charging relay, the series connection relay, and the first neutral point relay of the system main relay in such a manner that both the first capacitor and the second capacitor are precharged.

3. The power supply device according to claim 1 or 2, wherein: When the external power source that supplies the external DC power is connected to the external charging connector, the control device controls the system main relay, the charging relay, the series connection relay, the parallel connection relay, the first neutral point relay, and the second neutral point relay in such a manner that the first capacitor and the second capacitor are both precharged, and detects whether there is an abnormality in the first current path based on the voltage of the first capacitor, and detects whether there is an abnormality in the second current path based on the voltage of the second capacitor.

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