Power supply device

Abstract

To provide a power supply device capable of detecting current path abnormalities more appropriately.SOLUTION: In a power supply device, a system main relay, a charging relay, a series connection relay, a parallel connection relay, and first and second neutral point relays are controlled such that first and second capacitors are both precharged, the presence of an abnormality in a first current path charging the first capacitor is detected based on the voltage of the first capacitor, and the presence of an abnormality in a second current path charging the second capacitor is detected based on the voltage of the second capacitor.SELECTED DRAWING: Figure 2

Description

[Technical field]

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

[0002] Conventionally, a power supply device that supplies power to an inverter or a converter has been proposed (for example, see Patent Document 1). The power supply device is a motor device that 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 with voltage conversion. The first relay is attached to a first power line that connects the first power storage device and the converter. The second relay is attached to a second power line that connects the second power storage device and the inverter. The first capacitor is connected to the first power line on the converter side of the first relay. The second capacitor is connected to the power line of the inverter. The DC charging device is connected to the second power line on the second power storage device side of the second relay. The DC charging device supplies external DC power from the external charging connector to the second power line. The motor device turns off the first relay and turns on the second relay to detect a fault in the second relay based on the voltage of the second capacitor. After detecting the fault in the second relay, the motor device turns on the first relay and detects a fault in the first relay based on the voltage of the first capacitor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-87156 A Summary of the Invention [Problem to be solved by the invention]

[0004] Recently, a power supply device has been proposed that can switch between connecting the first and second power storage units in series and connecting the first and second power storage units in parallel. This power supply device includes a DC charging device having 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, first and second neutral point relays, and a second capacitor. The charging power line connects an external charging connector to a portion between the system main relay and the inverter of the power line. The charging relay is attached to the charging power line. The series connection line connects the first and second power storage units in series. The series connection relay is attached to the series connection line. The parallel connection line connects the first power storage unit side of the series connection relay of the series connection line to the second power storage unit side of the negative pole side relay of the negative pole side line of the power line and the pre-charge relay. The parallel connection relay is attached to the parallel connection line. The neutral point line connects the neutral point of the three-phase AC motor to the second power storage unit side of the series connection relay on the series connection line. The first neutral point relay is attached to the neutral point line. The second neutral point relay is attached to the neutral point line on the second power storage unit side of the first neutral point relay. The second capacitor is attached between the first neutral point relay and the second neutral point relay on the neutral point line, and on the inverter side of the negative pole relay on the negative pole line of the power line. It is desired that this power supply device be able to detect abnormalities in the current path more accurately.

[0005] The main object of the power supply device of the present disclosure is to more accurately detect an abnormality in a current path. [Means for solving the problem]

[0006] The power supply device of the present disclosure employs the following measures to achieve the above-mentioned main object.

[0007] The power supply device of the present disclosure comprises: A power supply device for supplying power to an inverter having a plurality of switching elements and diodes connected in parallel in a reverse direction to each of the switching elements, the inverter driving a three-phase AC motor, a power storage device including a first power storage unit and a second power storage unit; a system main relay including: a positive-side relay attached to a positive-side line of a power line connecting the power storage device and the inverter; a negative-side relay attached to a negative-side line of the power line; and a precharge circuit in which a precharge resistor and a precharge relay are connected in series to bypass the negative-side relay; a first capacitor attached to the power line; a charging power line connecting an external charging connector to which external DC power is supplied and a portion of the power line between the system main relay and the inverter, a charging relay attached to the charging power line, a series connection line connecting the first power storage unit and the second power storage unit in series, a series connection relay attached to the series connection line, a parallel connection line connecting a side of the first power storage unit of the series connection relay on the series connection line and a side of the second power storage unit of the negative side line of the power line between the negative side relay and the precharge circuit, and a parallel connection relay attached to the parallel connection line. a neutral point line connecting a neutral point of the three-phase AC motor and a side of the series connection relay of the series connection line to the second power storage unit, a first neutral point relay attached to the neutral point line, a second neutral point relay attached to the neutral point line on the second power storage unit side of the first neutral point relay, and a second capacitor attached between the first neutral point relay and the second neutral point relay on the neutral point line and on the inverter side of the negative pole side relay and the precharge circuit of the negative pole side line of the power line, and a control device that controls the system main relay, the charging relay, the series connection relay, the parallel connection relay, and the first and second neutral point relays so that both of the first and second capacitors are precharged, detects the presence or absence of an abnormality in a first current path that charges the first capacitor based on a voltage of the first capacitor, and detects the presence or absence of an abnormality in a second current path that charges the second capacitor based on the voltage of the second capacitor; The gist of the project is to provide the following:

[0008] The power supply device of the present disclosure controls the system main relay, the charging relay, the series connection relay, the parallel connection relay, and the first and second neutral point relays so that both the first and second capacitors are precharged, detects the presence or absence of an abnormality in the first current path that charges the first capacitor based on the voltage of the first capacitor, and detects the presence or absence of an abnormality in the second current path that charges the second capacitor based on the voltage of the second capacitor. As a result, the power supply device of the present disclosure can more accurately detect abnormalities in the current paths.

[0009] In such a power supply device of the present disclosure, the control device may turn on the positive side relay, the precharge relay, the parallel connection relay, and the second neutral relay of the system main relay, and turn off the negative side relay, the charging relay, the series connection relay, and the first neutral relay of the system main relay so that both the first and second capacitors are precharged. This allows the control device to set the first current path as a path returning to 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 4. In addition, the control device may set the second current path as a path returning to the second battery via the neutral line, the second capacitor, and the negative side line of the power line.

[0010] Furthermore, 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, and the first and second neutral point relays so that both of the first and second capacitors are precharged when an external power source that supplies the external DC power is connected to the external charging connector, and detect the presence or absence of an abnormality in the first current path based on the voltage of the first capacitor, and detect the presence or absence of an abnormality in the second current path based on the voltage of the second capacitor. In this way, the power supply device of the present disclosure can detect the presence or absence of an abnormality in the first current path and the second current path when an external power source that supplies external DC power is connected to the external charging connector. [Brief description of the drawings]

[0011] [Figure 1] 1 is a diagram showing an outline of the configuration of a power supply device 20 according to the present embodiment. [Diagram 2] 10 is a flowchart showing an example of a post-connection processing routine executed by the control device 60. [Diagram 3] FIG. 11 is an explanatory diagram for explaining a current path in the power supply device 20 when step S110 is executed. [Figure 4] 11 is an explanatory diagram for explaining a third current path Pc3. FIG. [Diagram 5] FIG. 11 is an explanatory diagram for explaining a fourth current path Pc4. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] An embodiment of the present disclosure will be described with reference to the drawings. Fig. 1 is a schematic diagram showing the configuration of a power supply device 20 according to the present embodiment. The power supply device 20 according to the embodiment is configured as a device that supplies power to an inverter 24 that drives a motor 22. The power supply device 20 includes a battery 26 as an electricity storage device, a system main relay 28, a first capacitor 34, a DC charging device 40, and a control device 60.

[0013] The motor 22 is configured as a well-known three-phase AC motor having a rotor with a permanent magnet attached to its outer surface and a stator with a three-phase coil wound around it. The inverter 24 is configured with six transistors T1 to T6 as switching elements and six diodes D1 to D6 connected in parallel to the transistors T1 to T6 in the opposite direction. The transistors T1 to T6 are arranged in pairs so that the inverter 24 is on the source side and the inverter 24 is on the sink side of the positive and negative bus bars shared by the inverter 24 as the power line 30. The transistors T1 to T6 are connected to the three-phase coils (U-phase, V-phase, W-phase) of the motor 22 at the connection points between the paired transistors. The inverter 24 forms a rotating magnetic field in the three-phase coils by controlling the ratio of the on-time of the paired transistors T1 to T6 while a voltage is acting between the positive and negative bus bars, thereby driving the motor 22 to rotate. A first smoothing capacitor 34 is connected to the power line 30.

[0014] The battery 26 includes a first cell 26a as a first power storage unit, and a second cell 26b as a second power storage unit having a capacity n times ("n" is an integer) that of the first cell 26a, and is connected to a power line 30. The first cell 26a and the second cell 26b are configured as, for example, lithium ion secondary batteries or nickel-metal hydride secondary batteries.

[0015] 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 attached to a positive side line 30B of the power line 30. The negative side relay SMRG is attached to a negative side line 30G of the power line 30. In the precharge circuit, a precharge resistor R and a precharge relay SMRP are connected in series to bypass the negative side relay SMRG.

[0016] 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, first and second neutral point relays DCRN and DCRNB, and a second capacitor 48. The external charging connector 42 is connected to an external DC power source, and DC power (external DC power) is supplied 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 and the inverter 24 of the power line 30. The charging relay 44 is attached to 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 attached to the series connection line 45. The parallel connection line 46 connects the first battery 26a side of the series connection relay DCR of the series connection line 45 to the second battery 26b side of the negative pole relay SMRG and pre-charge circuit of the negative pole line 30G of the power line 30. The parallel connection relay DCRNG is attached to the parallel connection line 46. The neutral point line 47 connects the neutral point of the motor 22 to the second battery 26b side of the series connection relay DCR of the series connection line 45. The first neutral point relay DCRN is attached to the neutral point line 47. The second neutral point relay DCRNB is attached to the neutral point line 47 on the second battery 26b side of the first neutral point relay DCRN. The second capacitor 48 is attached between the first neutral point relay DCRN and the second neutral point relay DCRNB on the neutral point line 47, and on the inverter 24 side of the negative side line 30G of the power line 30 relative to the negative side relay SMRG and the precharge circuit.

[0017] Although not shown, the control device 60 is configured as a microprocessor centered on a CPU, and in addition to the CPU, 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. Examples of the signals input to the control device 60 include a rotational position θm from a rotational position detection sensor (e.g., resolver) 23 that detects the rotational position of the rotor of the motor 22, phase currents flowing through the three-phase coils (U-phase, V-phase, and W-phase) of the motor 22, a voltage VH from a voltage sensor 34a that detects the voltage of the first capacitor 34, and a voltage VL from a voltage sensor 48a that detects the voltage of the second capacitor 48. The control device 60 is also connected to a communication line for communicating with an external power source via the external charging connector 42.

[0018] Various control signals are output via an output port from the control device 60. Examples of signals output from the control device 60 include a switching control signal to the transistors T1 to T6 of the inverter 24, a drive control signal to the system main relay 28, a drive control signal to the charging relay 44, a drive control signal to the series connection relay DCR, a drive control signal to the parallel connection relay DCRNG, a drive control signal to the first neutral point relay DCRN, and a drive control signal to the second neutral point relay DCRNB.

[0019] When an external power source is connected to the external charging connector 42 of the DC charging device 40, the control device 60 inputs a voltage Vd of DC power supplied by the external power source (external DC voltage Vd). When the external DC voltage Vd is equal to the rated voltage V1 of the battery 26 when the first battery 26a and the second battery 26b are connected in series, the control device 60 charges the battery 26 through a first charging by the DC charging device 40, and when the external DC voltage Vd is n times the rated voltage V1 ("n" is a positive value smaller than the value 1), the control device 60 charges the battery 26 through a second charging by the DC charging device 40. 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 and second neutral point relays DCRN and 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, with the first battery 26a and the second battery 26b 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, and the first and second neutral point relays DCRN and DCRNB, and turns off the negative side relay SMRG of the system main relay 28, the pre-charge relay SMRP, and the series connection relay DCR. Therefore, in the second charging, the first battery 26a and the second battery 26b are connected in parallel. The first battery 26a is charged via a current path that runs from the positive line of the charging power line 43, through the positive line 30B of the power line 30, the first battery 26a, the parallel connection line 46, and the negative line 30G of the power line 30, and returns to the negative line of the charging power line 43. The second battery 26b is charged via a current path that runs from the positive line of the charging power line 43, through the positive line 30B of the power line 30, any one of the diodes D1 to D3 of the inverter 24, the motor 22, the neutral line 47, the second battery 26b, and the negative line 30G of the power line 30, and returns to the negative line of the charging power line 43.

[0020] Next, the operation of the power supply device 20 configured as above, particularly the operation when the DC charging device 40 starts the first or second charging of the battery 26, will be described. Fig. 2 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 an external power source is connected to the external charging connector 42. Note that before this routine is executed, the system main relay 28, the charging relay 44, the series connection relay DCR, the parallel connection relay DCRNG, and the first and second neutral point relays DCRN and DCRNB are all off.

[0021] When the first current path Pc1 routine is executed, as shown in the figure, the control device 60 turns on the parallel connection relay DCRNG, the positive side relay SMRB of the system main relay 28, and the second neutral point relay DCRNB (step S100). Next, the control device 60 turns on the precharge relay SMRP of the system main relay 28 (step S110). FIG. 3 is an explanatory diagram for explaining the current path in the power supply device 20 when step S110 is executed. In the figure, the thick solid line shows an outline of the first current path Pc1. The thick dashed line shows an outline of the second current path Pc2. The parallel connection relay DCRNG, the positive side relay SMRB of the system main relay 28, the second neutral point relay DCRNB, the system main relay 28, and the second current path Pc2 are formed. The first current path Pc1 is a path that returns from the first battery 26a to the second battery 26b via the positive line 30B of the power line 30, the first capacitor 34, the negative line 30G of the power line 30, and the parallel connection line 46. When there is no abnormality such as a disconnection in the first current path Pc1, the first capacitor 34 is precharged (charged) by the current flowing through the first current path Pc1, and the voltage VH rises. The second current path Pc2 is a path that returns from the second battery 26b to the second battery 26b via the neutral point line 47, the second capacitor 48, and the negative line 30G of the power line 30. When there is no abnormality such as a disconnection in the second current path Pc2, the second capacitor 48 is precharged (charged) by the current flowing through the second current path Pc2, and the voltage VL rises.

[0022] 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 equal to or lower than a threshold Vref1 (step S130). The threshold Vref1 is a threshold for determining whether an abnormality occurs in the first current path Pc1 such that the first capacitor 34 cannot be charged, such as a break in the first current path Pc1. The threshold Vref1 can be set to a value slightly larger than 0, for example, 3V, 5V, 8V, etc. If the voltage VH is higher than the threshold Vref1 in step S130, the control device 60 determines that no abnormality occurs in the first current path Pc1 (step S140).

[0023] Then, the control device 60 further determines whether the voltage VL is equal to or lower than a threshold value Vref2 (step S150). The threshold value Vref2 is a threshold value for determining whether an abnormality that prevents the second capacitor 48 from being charged, such as a disconnection, occurs in the second current path Pc2. The threshold value Vref2 can be set to a value slightly larger than 0, for example, 3 V, 5 V, 8 V, etc. When the voltage VL is higher than the threshold value Vref2 in step S150, the control device 60 determines that no abnormality occurs in the second current path Pc2 (step S160).

[0024] 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 precharge 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.

[0025] 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), and ends this routine without performing the first charging and second charging.

[0026] When the voltage VL is equal to or lower 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), and ends this routine without performing the first charging and the second charging. In this manner, the power supply device 20 of the present embodiment detects the presence or absence of an abnormality in the first current path Pc1 that charges the first capacitor 34 based on the voltage VH of the first capacitor 34, and detects the presence or absence of an abnormality in the second current path Pc2 that charges the second capacitor 48 based on the voltage VL of the second capacitor 48, so that an abnormality in the current path can be detected more appropriately.

[0027] 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 DCRN, and the second neutral point relay DCRNB so that the first capacitor 34 and the second capacitor 48 are both pre-charged, and detects the presence or absence of an abnormality in the first current path Pc1 that charges the first capacitor 34 based on the voltage VH of the first capacitor 34, and detects the presence or absence of an abnormality in the second current path Pc2 that charges the second capacitor 48 based on the voltage VL of the second capacitor 48, thereby allowing the power supply device 20 to more appropriately detect abnormalities in the current paths.

[0028] The control device 60 also turns on the positive side relay SMRB, the precharge relay SMRP, the parallel connection relay DCRNG, and the second neutral relay DCRNB of the system main relay 28 so that both the first capacitor 34 and the second capacitor 48 are precharged, and turns off the negative side relay SMRG, the charging relay 44, the series connection relay DCR, and the first neutral relay DCRN of the system main relay 28. This allows the control device 60 to set the first current path Pc1 as a path that returns from the first battery 26a to 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. The control device 60 also allows the second current path Pc2 to be a path that returns from the second battery 26b to the second battery 26b via the neutral line 47, the second capacitor 48, and the negative side line 30G of the power line 30.

[0029] Furthermore, when an 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 pre-charged, and detects the presence or absence of an abnormality in the first current path Pc1 based on the voltage VH of the first capacitor 34, and detects the presence or absence of an abnormality in the second current path Pc2 based on the voltage VL of the second capacitor 48. In this way, the power supply device 20 can detect the presence or absence of an abnormality in the first current path Pc1 and the second current path Pc2 when an external power source is connected to the external charging connector 42.

[0030] In the above-described embodiment, the control device 60 turns on the positive side relay SMRB of the system main relay 28, the precharge relay SMRP, the parallel connection relay DCRNG, and the second neutral 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 relay DCRN, to precharge both the first capacitor 34 and the second capacitor 48. However, the first capacitor 34 and the second capacitor 48 may be precharged 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 relay DCRN. The control device 60 then turns on the precharge relay SMRP of the system main relay 28. Through this process, a current flows through the third current path Pc3 to precharge the first capacitor 34. FIG. 4 is an explanatory diagram for explaining the third current path Pc3. The third current path Pc3 is a path that runs from the first battery 26a via the positive electrode line 30B of the power line 30, the first capacitor 34, the negative electrode line 30G of the power line 30, and the parallel connection line 46 back to the first battery 26a.

[0031] Next, the control device 60 inputs the voltage VH from the voltage sensor 34a, and determines whether or not the voltage VH is equal to or lower than the threshold value Vref1 in the same process as in step S130. When the voltage VH is equal to or lower 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 process. 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.

[0032] When the control device 60 determines that no abnormality such as a break has occurred in the third current path Pc3, it turns on the second neutral point relay DCRNB. This process causes a current to flow through the fourth current path Pc4 to precharge the second capacitor 48. FIG. 5 is an explanatory diagram for explaining the fourth current path Pc4. Since the first capacitor 34 has already been precharged, a reverse bias voltage is applied to the diodes D1 to D3 of the inverter 24, and no current flows through the diodes D1 to D3 and the motor 22 to the neutral point line 47. Therefore, the fourth current path Pc4 is a path that returns to the second battery 26b via the neutral point line 47, the second capacitor 48, and the negative pole side line 30G of the power line 30.

[0033] Next, the control device 60 inputs the voltage VL from the voltage sensor 48a, and determines whether or not the voltage VL is equal to or lower than the threshold value Vref2 in the same process as step S150. When the voltage VL is equal to or lower 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 process. 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, and executes the first charge or the second charge, and ends the process. This allows the power supply device 20 to more appropriately detect an abnormality in the current path.

[0034] In the embodiment described above, the control device 60 executes the process illustrated in Fig. 2 when an external power source is connected to the external charging connector 42. However, the time when the control device 60 executes the process illustrated in Fig. 2 is not limited to when an external power source is connected to the external charging connector 42, and the control device 60 may execute the process illustrated in Fig. 2 whenever it is necessary to pre-charge the first capacitor 34 and the second capacitor 48.

[0035] In the above-described embodiment, the power supply device 20 includes the battery 26 having the first cell 26a and the second cell 26b, but at least one of the first cell 26a and the second cell 26b may be a capacitor.

[0036] The correspondence between the main elements of the embodiment and the main elements of the invention described in the section on Means for Solving the Problems will be described. In the embodiment, the first battery 26a corresponds to the "first power storage unit", the second battery 26b corresponds to the "second power storage unit", the battery 26 corresponds to the "power storage device", the positive relay SMRB corresponds to the "positive relay", the negative relay SMRG corresponds to the "negative relay", the pre-charge resistor R corresponds to the "pre-charge resistor", the pre-charge relay SMRP corresponds to the "pre-charge relay", the system main relay 28 corresponds to the "system main relay", the first capacitor 34 corresponds to the "first capacitor", the charging power line 43 corresponds to the "charging power line", and the charging relay 44 corresponds to the "charging device". the series connection line 45 corresponds to the "series connection line", the series connection relay DCR corresponds to the "series connection relay", the parallel connection line 46 corresponds to the "parallel connection line", the parallel connection relay DCRNG corresponds to the "parallel connection relay", the neutral point line 47 corresponds to the "neutral point line", the first neutral point relay DCRN corresponds to the "first neutral point relay", the second neutral point relay DCRNB corresponds to the "second neutral point relay", the second capacitor 48 corresponds to the "second capacitor", the DC charging device 40 corresponds to the "DC charging device", and the control device 60 corresponds to the "control device".

[0037] Note that the correspondence between the main elements of the embodiment and the main elements of the invention described in the Means for Solving the Problem column does not limit the elements of the invention described in the Means for Solving the Problem column, since the embodiment is an example for specifically explaining the form for implementing the invention described in the Means for Solving the Problem column. In other words, the interpretation of the invention described in the Means for Solving the Problem column should be made based on the description in that column, and the embodiment is merely a specific example of the invention described in the Means for Solving the Problem column.

[0038] The above describes embodiments for implementing the present disclosure, but the present disclosure is not limited to these embodiments, and it goes without saying that the present disclosure can be implemented in various forms without departing from the gist of the present disclosure. [Industrial Applicability]

[0039] The present disclosure is applicable to the power supply device manufacturing industry and the like. [Explanation of symbols]

[0040] 20 power supply device, 22 motor, 24 inverter, 26 battery, 26a first battery, 26b second battery, 28 system main relay, 30 power line, 30B positive side line, 30G negative side line, 34 first capacitor, 34a, 48a voltage sensor, 40 DC charging device, 42 external charging connector, 43 charging power line, 44 charging relay, 45 series connection line, 46 parallel connection line, 47 neutral point line, 48 second capacitor, 60 control device, D1 to D6 diodes, DCR series connection relay, DCRN first neutral point relay, DCRNB second neutral point relay, DCRNG parallel connection relay, Pc1 first current path, Pc2 second current path, Pc3 third current path, Pc4 fourth current path, R pre-charge resistor, SMRB positive side relay, SMRG Negative relay, SMRP precharge relay, R precharge resistor, T1~T6 transistors.

Claims

1. A power supply device for supplying power to an inverter having a plurality of switching elements and diodes connected in parallel in a reverse direction to each of the switching elements, the inverter driving a three-phase AC motor, a power storage device including a first power storage unit and a second power storage unit; a system main relay including: a positive-side relay attached to a positive-side line of a power line connecting the power storage device and the inverter; a negative-side relay attached to a negative-side line of the power line; and a precharge circuit in which a precharge resistor and a precharge relay are connected in series to bypass the negative-side relay; a first capacitor attached to the power line; a charging power line connecting an external charging connector to which external DC power is supplied and a portion of the power line between the system main relay and the inverter, a charging relay attached to the charging power line, a series connection line connecting the first power storage unit and the second power storage unit in series, a series connection relay attached to the series connection line, a parallel connection line connecting a side of the first power storage unit of the series connection relay to a side of the second power storage unit of the negative side line of the power line between the negative side relay and the precharge circuit, and a parallel connection relay attached to the parallel connection line. a neutral point line connecting a neutral point of the three-phase AC motor and a side of the series connection relay of the series connection line to the second power storage unit, a first neutral point relay attached to the neutral point line, a second neutral point relay attached to the neutral point line on the second power storage unit side of the first neutral point relay, and a second capacitor attached between the first neutral point relay and the second neutral point relay on the neutral point line and on the inverter side of the negative pole side relay and the precharge circuit of the negative pole side line of the power line, and a control device that controls the system main relay, the charging relay, the series connection relay, the parallel connection relay, and the first and second neutral point relays so that both of the first and second capacitors are precharged, detects the presence or absence of an abnormality in a first current path that charges the first capacitor based on a voltage of the first capacitor, and detects the presence or absence of an abnormality in a second current path that charges the second capacitor based on the voltage of the second capacitor; A power supply device comprising:

2. 2. The power supply device according to claim 1, The control device turns on the positive side relay, the precharge 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, so that both the first and second capacitors are precharged. power supply.

3. 3. The power supply device according to claim 1, The control device controls the system main relay, the charging relay, the series connection relay, the parallel connection relay, and the first and second neutral point relays so that the first and second capacitors are both precharged when an external power source that supplies the external DC power is connected to the external charging connector, detects the presence or absence of an abnormality in the first current path based on a voltage of the first capacitor, and detects the presence or absence of an abnormality in the second current path based on the voltage of the second capacitor. power supply.

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