JP2013169087A - Abnormality detecting device of power supply device and electric drive device of rotating electric machine provided with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly start vehicle drive by shortening abnormality diagnosis of a contactor to be executed at starting of a vehicle.SOLUTION: An abnormality detecting device of a power supply device includes: a capacitor voltage detecting means to measure an inter-terminal voltage of a smoothing capacitor; and a control means to control a switching command of a positive electrode contactor, a negative electrode contactor and a precharge contactor. The control means includes a diagnostic means that diagnoses welding abnormality of either of a positive electrode side contactor or a negative electrode contactor containing a positive electrode contactor and a precharge contactor at timing to output a start time command for vehicle start-up to the positive electrode contactor, the negative electrode contactor and the precharge contactor, and diagnoses the welding abnormality of the other of the positive electrode side contactor and the negative electrode contactor at the timing to output a stop time command for vehicle stop to the positive electrode contactor, the precharge contactor, the negative electrode contactor and the precharge contactor.

Description

  The present invention relates to an abnormality detection device for a power supply device and an electric drive device for a rotating electrical machine including the same.

  In an electric vehicle such as a hybrid vehicle (HEV) or an electric vehicle (EV), an assembled battery (battery system) configured by connecting a large number of unit cells of a secondary battery in series is used to secure a desired high voltage. It has been. In an electric drive device such as a hybrid vehicle that converts the output from the assembled battery into alternating current by an inverter and drives an alternating current motor, a positive electrode is connected to each high-voltage power supply line that connects between the positive electrode and the negative electrode of the assembled battery and the inverter. A contactor and a negative contactor are connected in series. In addition, a series circuit of a resistor and a precharge contactor is connected in parallel to the positive contactor.

  On the inverter side, a smoothing capacitor for smoothing the DC voltage is provided in parallel with the inverter. Since this smoothing capacitor has a large capacity, when the positive and negative contactors are closed and a discharged smoothing capacitor is suddenly connected to the assembled battery, a large current flows through the positive and negative high-voltage power supply lines, and the positive and negative contactors There is a possibility of welding. Therefore, the power supply from the assembled battery to the inverter is performed by first charging the smoothing capacitor (precharge) by first closing the precharge contactor and the negative electrode contactor, and this capacitor voltage becomes the voltage of the assembled battery. This is done by closing the positive contactor in the state.

  In this way, by precharging the smoothing capacitor, a method of eliminating inrush current when the positive contactor is closed and preventing contact welding of the contactor is widely used. However, there is a possibility that the contactor may be welded due to a contact arc generated during opening / closing operation or aged deterioration with long-term use of the electric drive device. When the contactors of the positive electrode and the negative electrode are welded, it becomes impossible to separate the secondary battery and the inverter, and problems such as unnecessary discharge of the assembled battery occur. For this reason, when contactor welding is detected, it is necessary to prohibit contactor closing operation or to notify the vehicle operator (driver).

  For this reason, techniques for diagnosing whether the positive and negative electrode contactors are welded when the electric vehicle is started or stopped have been actively developed. Although this contactor welding diagnosis is a process that takes some time, contactor welding occurs most often when the battery pack is connected to the inverter, that is, when the vehicle is started. It is performed at the time of starting (for example, refer to Patent Documents 1 and 2). In addition, a technique that is performed when the vehicle is stopped is also disclosed (for example, see Patent Document 3).

JP 2000-134707 A Japanese Patent No. 4760723 Japanese Patent No. 4,570,859

  Since the conventional contactor welding diagnosis method takes time, if it is performed at the start of the vehicle, it is necessary to delay the start of driving of the vehicle for a predetermined time.

(1) The invention described in claim 1 includes a positive contactor provided in a positive power supply line connecting a battery and an inverter, and a negative contactor provided in a negative power supply line connecting the battery and the inverter. A precharge contactor and a limiting resistor connected in parallel to the positive electrode contactor and connected in series to each other; a smoothing capacitor interposed in parallel with the inverter between the positive power line and the negative power line; and a smoothing capacitor An abnormality detection device for a power supply device comprising capacitor voltage detection means for measuring a voltage between terminals of the power supply, and control means for controlling an opening / closing command of a positive contactor, a negative contactor, and a precharge contactor. Starting up the vehicle for contactor, negative contactor and precharge contactor At the timing when the hour command is output, the welding abnormality of either the positive contactor and the negative contactor including the positive contactor and the precharge contactor is diagnosed, and the positive contactor, the precharge contactor, the negative contactor, and the precharge contactor are An abnormality detection device for a power supply device comprising diagnostic means for diagnosing the welding abnormality of one of a positive contactor and a negative contactor at a timing of outputting a stop time command for stopping the vehicle.
(2) The invention according to claim 2 is the abnormality detection device for the power supply device according to claim 1, wherein the diagnosis means diagnoses the welding abnormality of the negative electrode contactor at the timing of outputting the startup command. And a positive side diagnosis means for diagnosing a welding abnormality of the positive contactor at a timing of outputting the stop time command. (3) The invention according to claim 3 is characterized in that the invention according to claim 3 is provided. In the abnormality detection device of the power supply apparatus, the negative diagnostic means outputs a command to close the precharge contactor at the timing of outputting the startup command and detects the voltage across the terminals of the smoothing capacitor by the capacitor voltage detection means. After that, a command to open the precharge contactor is output, and the voltage across the terminals of the smoothing capacitor is detected and detected by the capacitor voltage detecting means. The abnormality in welding of the negative electrode contactor is determined based on the difference in voltage between the terminals of the two smoothing capacitors. (4) The invention according to claim 4 is the abnormality detection device for a power supply device according to claim 3 In the negative diagnosis means, the voltage across the smoothing capacitor when the command to open the precharge contactor is output is lower than the voltage between the terminals of the smoothing capacitor when the command to close the precharge contactor is output. If it is, it is determined that the negative electrode contactor is welded abnormally.
(5) The invention according to claim 5 is the abnormality detection device for the power supply device according to claim 2 or 3, wherein the control means includes a storage unit for storing the diagnosis result of the positive contactor, and issues a startup command. The diagnostic result of the positive contactor is read at the output timing, and it is determined that the positive contactor has a welding abnormality.
(6) According to a sixth aspect of the present invention, in the abnormality detection device for a power supply device according to any one of the third to fifth aspects, the positive side diagnosis means outputs the capacitor voltage at the timing of outputting the stop command. The voltage between the terminals of the smoothing capacitor is detected by the detection means, and then a command to open the positive contactor is output and the voltage between the terminals of the smoothing capacitor is detected by the capacitor voltage detection means. The welding abnormality of the positive contactor is determined based on the voltage difference.
(7) The invention according to claim 7 is the abnormality detection device for the power supply device according to claim 6, wherein the positive side diagnosis means outputs a voltage across the terminals of the smoothing capacitor when a command to open the positive contactor is output. When the voltage between the terminals of the smoothing capacitor before outputting the command to open the positive contactor does not decrease, it is determined that the positive contactor is abnormally welded.
(8) The invention according to claim 8 is the abnormality detection device for the power supply device according to any one of claims 1 to 7, further comprising battery voltage detection means for measuring the total voltage of the battery, and control means. Controls the positive contactor, the negative contactor and the precharge contactor to be opened at the timing when the startup command is output, and detects the voltage between the battery terminals and the voltage between the terminals of the smoothing capacitor. When the difference between the voltages is smaller than a predetermined value, it is determined that both the positive contactor and the negative contactor are abnormal in welding.
(9) The invention according to claim 9 is a positive contactor provided in a positive power line connecting a battery and an inverter; a negative contactor provided in a negative power line connecting the battery and the inverter; Precharge contactor and limiting resistor connected in parallel to the positive contactor and connected in series with each other, a smoothing capacitor interposed in parallel with the inverter between the positive power supply line and the negative power supply line, and the voltage across the terminals of the smoothing capacitor An abnormality detection device for a power supply device comprising a capacitor voltage detection means for measuring a positive electrode contactor, a negative electrode contactor, and a control means for controlling an opening / closing command of the precharge contactor, wherein the negative electrode contactor and the positive electrode contactor are turned on. Before supplying the battery DC power to the inverter. An abnormality detection device for a power supply device, wherein the negative electrode contactor is determined to have a welding abnormality when the voltage between the terminals of the smoothing capacitor when only the contactor is turned off is decreased when the precharge contactor is turned off. It is.
(10) A tenth aspect of the invention is an electric drive device for a rotating electrical machine including the abnormality detection device for a power supply device according to any one of the first to ninth aspects.

  By using the contactor abnormal welding detection device according to the present invention and the electric drive device of the rotating electrical machine provided with the contactor, vehicle drive after vehicle start-up (key-on) can be started quickly.

It is a figure which shows schematic structure of the electric drive device of the rotary electric machine carrying the abnormality detection apparatus of the power supply device by this invention. It is a timing chart which shows the time change of the state of each contactor and the voltage between the terminals of a smoothing capacitor of contactor abnormality diagnosis (first abnormality diagnosis) at the time of vehicle starting with the abnormality detection device of the power supply device of a contactor by the present invention. 3 is a timing chart showing the state of each contactor and the voltage between terminals of the smoothing capacitor in steps S5 and S8 to S13 of the flow of FIG. 2 when both the positive electrode side and negative electrode side contactors are welded when the vehicle is started. 2 is a timing chart showing the state of each contactor and the voltage across the terminals of the smoothing capacitor in steps S5 and S8 to S13 of the flow of FIG. 2 when both the positive electrode side and negative electrode side contactors are operating normally when the vehicle is started. is there. 3 is a timing chart showing the state of each contactor and the voltage between terminals of the smoothing capacitor in steps S16 to S28 in the flow of FIG. 2 when both the positive electrode side and negative electrode side contactors are welded when the vehicle is started. 3 is a timing chart showing the state of each contactor and the voltage across the terminals of the smoothing capacitor in steps S16 to S28 in the flow of FIG. 2 when both the positive electrode side and negative electrode side contactors are operating normally when the vehicle is started. FIG. 4 is a diagram of a processing flow of contactor abnormality diagnosis (first abnormality diagnosis) at the time of vehicle startup in the abnormality detection device for a power supply device according to the present invention corresponding to FIG. 2. FIG. 8 is a timing chart showing the state of each contactor and the voltage between terminals of the smoothing capacitor in steps S54 to S58 in the flow of FIG. 7 when the positive contactor (main contactor (+)) is welded when the vehicle is stopped. . It is a timing chart which shows the state of each contactor in step S54-S58 of the flow of FIG. 7, and the voltage between terminals of a smoothing capacitor when all the contactors are operating normally when the vehicle is stopped. FIG. 5 is a diagram showing a modified embodiment in which a discharge resistance relay is provided in series with a discharge resistance in the electric drive device for a rotating electrical machine equipped with the abnormality detection device for a power supply device according to the present invention shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
The contactor abnormality detection device and the electric drive device for a rotating electric machine provided with the same according to the present invention are a pure electric vehicle (EV) that is driven only by the rotating electric machine, or a hybrid electric that is driven by both the engine and the rotating electric machine. Applicable to automobile (HEV).

FIG. 1 is a diagram showing a schematic configuration of a contactor abnormality detection device according to the present invention and an electric drive device of a rotating electrical machine including the contactor abnormality detection device.
The electric drive device 2 that electrically drives the rotating electrical machine (motor) 1 monitors the charge / discharge states of the inverter 3 and the battery system 4 that convert DC power supplied from the battery system 4 into AC power and supplies the AC power to the motor 1. A battery controller 5 for controlling, and a motor controller 6 for controlling the inverter 3.

  The motor controller 6 and the battery controller 5 are controlled by a vehicle controller 7 which is a host controller. When the ignition switch 8 is turned on by a vehicle operator (driver), low-voltage DC power is supplied from the low-voltage battery 9 to the vehicle controller 7 and the electric drive device 2. As a result, the vehicle controller 6 is activated, and the battery controller 5 and the motor controller 6 of the electric drive device 2 are activated by the control of the vehicle controller 6 to control and drive the electric drive device 2. Communication among the vehicle controller 7, the battery controller 5, and the motor controller 6 is performed by CAN, for example.

  The battery system 4 is a high voltage battery including a plurality of secondary battery modules 10 in which a plurality of secondary battery cells such as lithium ion batteries are connected in series or in series and parallel. In addition, the secondary battery module 10 is configured by connecting a plurality of cell groups composed of a plurality of secondary battery cells connected in series in series or in series-parallel. It is shown.

Each cell group is monitored by the cell controller 11 associated with each cell group, and the state of the secondary battery cells of each cell group is controlled. Monitoring and charging / discharging states of the entire battery system are controlled by the battery controller 5, and a plurality of cell controllers 11 are controlled from the battery controller 5 via the communication path 12 to control charging / discharging states of the secondary battery cells.
The plurality of cell controllers 11 exchange information with the battery controller 5 by bidirectional communication, but this is simplified in FIG.

  The battery system 4 is usually divided into two large blocks, and a service disconnect switch (SDSW) 13 is provided between the two blocks. In FIG. 1, for the sake of simplicity, the battery system 4 including two secondary battery modules 10 is illustrated between two secondary battery modules 10. The SDSW 13 is used for the purpose of cutting off the output of the high-voltage DC voltage from the battery system 4 for ensuring safety during vehicle maintenance.

  Supply of high voltage DC power from the battery system 4 to the inverter is performed via the positive power supply line 14 and the negative power supply line 15, and in order to supply / cut off the DC power, the positive DC power supply line is supplied. Is provided with a main contactor (+) 16, and a main contactor (−) 17 is provided on the negative side DC power supply line. A series circuit of a precharge contactor 18 and a limiting resistor 19 (resistance value R2) is provided in parallel with the main contactor (+) 16. The main contactor (+) 16 and the main contactor (−) 18 are designed to withstand the use of high power because the high voltage DC power from the battery system 4 always flows, but they are repeatedly turned on / off many times. May cause welding.

  When the vehicle is started, the precharge contactor 18 is first turned on. Control of the main contactor (+) 16, the main contactor (−) 17 and the precharge contactor 18 will be described later. The contactors may be turned on / off from the battery controller 5 or from the motor controller 6. Note that wiring for controlling these contactors is omitted.

  Between the positive power supply line 14 and the negative power supply line 15, a voltage sensor 20 that detects the total battery voltage from the main contactor (+) 16 and the main contactor (−) 17 to the battery system side is provided. A voltage sensor 21 that detects a voltage between terminals of the smoothing capacitor 22 is provided. Although the output of the voltage sensor 20 is input to the battery controller 5, this wiring is omitted. The output of the voltage sensor 21 may be input to the battery controller 5 or may be input to the motor controller 6.

  In the description of the contactor abnormality detection device according to the present invention, which will be described later, the contactor welding abnormality is detected using the voltage detected by both the voltage sensors 20 and 21. As shown in FIG. 1, the battery controller 5 and the motor controller 6 communicate with each other via the CAN, and even if the output of the voltage sensor 21 is input to the motor controller 6, the battery controller 5 The voltage information detected at 21 may be obtained.

A smoothing capacitor 22 and a discharge resistor 23 are connected to the inverter 3 in parallel.
The inverter 3 includes a plurality of switching elements (not shown) such as IGBTs or MOSFETs, and the DC power supplied from the battery system 4 is converted into AC power and supplied to the motor 1 by switching of these switching elements. Although noise is generated by switching of the switching element, the smoothing capacitor 22 is provided to remove the noise. The switching of the switching element is performed by driving the gate of the switching element by a control signal (PWM signal, not shown) from the motor controller 6. The PWM signal is generated by the motor controller 6 based on the torque request from the vehicle controller 7, but the details are omitted.

In the EV or HEV, the motor 1 operates as a motor generator that generates power (regenerative power generation) when decelerating by an accelerator pedal returning operation or braking by depressing a brake pedal. In the case of this regenerative power generation, the inverter 3 converts AC power generated by the motor 1 into DC power and supplies it to the battery system 4 so that the battery system 4 is charged.
In the abnormality detection device for a power supply device according to the present invention, contactor welding abnormality diagnosis is performed at the timing when the start command is output from the vehicle and the timing when the start / stop command is output from the vehicle, and the results of diagnosis at two timings are comprehensively Then, contactor welding abnormality diagnosis is performed.

  The smoothing capacitor 22 is a large-capacitance capacitor. When the vehicle operation ends and the vehicle is stopped by key-off, it is necessary to discharge the electric charge stored in the smoothing capacitor 22. The discharge resistor 23 is connected in parallel to the smoothing capacitor 22 in order to discharge the electric charge of the smoothing capacitor 22.

  The contactor abnormality detection device according to the present invention is a detection device device that executes a contactor welding abnormality diagnosis method as described below. Therefore, the abnormality detection device for the power supply device according to the present invention includes various devices included in the control device that performs the contactor welding abnormality diagnosis and the electric drive device 2 that inputs a signal for the contactor welding abnormality diagnosis to the control device. is there. The control device may be either the battery controller 5 or the motor controller 6, but is preferably a control device that controls the main contactor (+) 16, the precharge contactor 18, and the main contactor (-).

Accordingly, the main contactor (+) 16, the precharge contactor 18, and the main contactor (-) 17 are devices for inputting a signal for contactor abnormality diagnosis to the control device of the abnormality detection device of the power supply device, and further, voltage The sensors 20 and 21 are also devices that generate a welding abnormality diagnosis signal.
The welding abnormality diagnosis method executed by the abnormality detection device for a power supply device according to the present invention will be described below.

(Contactor welding abnormality diagnosis)
The feature of the contactor abnormality diagnosis executed by the abnormality detection device of the power supply device according to the present invention is that the contactor abnormality diagnosis as conventionally performed is divided into two parts and executed. The first abnormality diagnosis is executed when the vehicle is started, and the second abnormality diagnosis is executed when the driving of the vehicle is finished. The conventional abnormality diagnosis performed by opening and closing the main contactor (+) 16 and the main contactor (−) 17 in the contactor abnormality diagnosis is included in the second abnormality diagnosis in the present invention. Since the main contactor (+) 16 and the main contactor (−) 17 are opened and closed in a state where a high voltage is applied, there is a possibility that these contactors are welded, and it is possible to diagnose the welding of the contactors. Although it is the purpose of the contactor abnormality diagnosis, there is a possibility that welding occurs when the contactor is opened and closed for the abnormality diagnosis. In the contactor abnormality diagnosis executed by the abnormality detection device of the power supply device according to the present invention, since the main contactor is not opened and closed in the first abnormality diagnosis, the possibility of contactor welding due to the abnormality diagnosis before driving the vehicle is eliminated. be able to.

  The power supply device that is the target of abnormality detection by the abnormality detection device according to the present invention includes the positive contactor 16 provided on the positive power supply line 14 that connects the battery 4 and the inverter 3, and the negative electrode side that connects the battery 4 and the inverter 3. An inverter is provided between the negative contactor 17 provided in the power supply line 15, the precharge contactor 18 and the limiting resistor 19 connected in parallel to each other in series with the positive contactor 16, and the positive power supply line 14 and the negative power supply line 15. 3, a smoothing capacitor 22 interposed in parallel, a capacitor voltage sensor 21 that measures the voltage across the terminals of the smoothing capacitor 22, and a battery controller that controls open / close commands of the positive contactor 16, the negative contactor 17, and the precharge contactor 18. 5 or represented by the motor controller 6 And a control device. Then, the control device for the abnormality detection device according to the present invention includes the positive contactor 16 and the precharge contactor at the timing when the start-up command for starting the vehicle is output to the positive contactor 16, the negative contactor 17, and the precharge contactor 18. The welding abnormality of any one of the positive electrode side contactor and the negative electrode contactor 17 including 18 is diagnosed, and the stop time command for stopping the vehicle is output to the positive electrode contactor 16, the negative electrode contactor 17, and the precharge contactor 18. Then, the welding abnormality of either one of the positive electrode side contactors 16 and / or 18 and the negative electrode contactor 17 is diagnosed. Hereinafter, the diagnostic procedure will be described in detail.

(First abnormality diagnosis)
FIG. 2 shows a processing flow of a first abnormality diagnosis executed by the abnormality detection device for a power supply device according to the present invention. The processing after step S6 in the first abnormality diagnosis is roughly divided into two (flows 1A and 1B).
In the flow 1A (steps S6 to S15), both the positive contactor (main contactor (+) 16 or the precharge contactor 18) and the negative contactor (main contactor (-) 17) are welded when the vehicle is started. This is a process of simply diagnosing whether or not there is. In step S5, the control is performed in a state in which all the contactors are controlled to be turned off, and these contactors are not switched on / off as in the prior art.

  The diagnostic processing timing charts of FIGS. 3 and 4 correspond to this flow 1A portion. The timing chart shown in FIG. 3 shows a case where both the positive electrode side and the negative electrode side contactor are welded when the vehicle is started. In the timing chart shown in FIG. 4, at least one of the positive electrode side and the negative electrode side is welded. There is no normal condition. The control state (dotted line) and the actual state (solid line) of each contactor are shown in the upper part of FIGS. 3 and 4, the total voltage VB of the battery system 4 detected by the voltage sensor 20 and the terminal voltage VC of the smoothing capacitor 22 detected by the voltage sensor 21 are shown.

The part of the flow 1B (steps S16 to S28) shows a diagnosis process in which only the precharge contactor 18 is turned on / off to perform contactor abnormality diagnosis. The diagnostic processing timing charts of FIGS. 5 and 6 correspond to this flow 1A portion. FIG. 5 is a timing chart showing a case where the negative contactor 17 is welded when the vehicle is started, and FIG. 6 is a timing chart when all the contactors are operating normally.
In the diagnosis process, since the on / off control of the main contactor (+) 16 and the main contactor (−) 17 is not performed even in the flow 1B, the diagnosis can be performed easily and at a higher speed than the conventional welding diagnosis.
Hereinafter, with reference to FIGS. 2 to 6, processing in each step of the first abnormality diagnosis will be described.

  In order to start a vehicle such as an EV or HEV, when the key is turned on (step S1) with the ignition switch 8 (FIG. 1), a control device for executing contactor abnormality diagnosis is started (step S2). As described above, this control device is a control device that performs contactor abnormality diagnosis, and may be the battery controller 5 or the motor controller 6. When the key is turned on, power is supplied from the low-voltage battery 9 to the battery controller 5 and the motor controller 6 on the low-voltage side of the vehicle controller 7 and the electric drive device 2 to be activated.

When the battery controller 5 and the motor controller 6 are activated, they perform initial processing such as grasping the state of the target monitored by each of them (step S3). For example, the battery controller 5 sends a signal for starting up the cell controller 11 that monitors each battery cell of the battery system 4, starts up a plurality of cell controllers in sequence, and through these cell controllers 11, Obtain data such as initial voltage conditions and temperature. The motor controller 6 also obtains data such as the inverter temperature and the voltage across the terminals of the smoothing capacitor. In addition, although the data regarding the state of each battery cell and an inverter are suitably input into the battery controller 5 or the motor controller 6 at predetermined time intervals, they are omitted in the flow of FIG.
Note that the timing of this initial processing that is performed simultaneously with key-on is time t0.

  In step S4, when a command to start welding diagnosis is sent from the vehicle controller 7 to the control device, welding diagnosis after step S5 is executed by the control device. At the time of starting the vehicle, if the contactor is in a normal state without welding, the main contactor (+) 16, the precharge contactor 18, and the main contactor (-) 17 are all off, that is, opened. In S5, control is performed to turn off these contactors, that is, open them. The time at this time is assumed to be t1 (see FIG. 3).

(Part of flow 1A in FIG. 2)
In step S6, the inter-terminal voltage VB of the battery system 4 detected by the voltage sensor 20 at the time t1 is compared with the inter-terminal voltage VC of the smoothing capacitor 22 detected by the voltage sensor 21, and is shown in the equation (1). Thus, if the difference is greater than the predetermined voltage difference ΔV1, it is determined that the positive contactors 16 and 18 and the negative contactor 17 are not in a welded state (see FIG. 4), and the process proceeds to step S16. . If the difference between VB and VC is smaller than ΔV1, the process proceeds to step S7.
VB−VC> ΔV1. . . (1)

  If both the positive contactor (main contactor (+) 16 or precharge contactor 18) and the negative contactor (main contactor (-) 17) are welded, the battery detected by the voltage sensor 20 is used. The inter-terminal voltage VB of the system 4 and the inter-terminal voltage VC of the smoothing capacitor detected by the voltage sensor 21 are substantially equal (see FIG. 3). When the main contactor (+) 16 that is the positive side contactor is welded, VB and VC are almost equal, and when only the precharge contactor 18 that is the positive side contactor is welded, the limiting resistance According to voltage division by 19 (resistance value R2) and discharge resistance 23 (resistance value R1), a difference occurs between the values of VB and VC. The threshold value ΔV1 for determination in step S6 is based on the case where only the precharge contactor is welded on the positive electrode side, so that it can be detected regardless of whether the main contactor (+) 16 or the precharge contactor 18 is welded. Set to

  3 shows a case where both the precharge contactor 18 and the main contactor (+) 16 are welded. 4 shows a case where both the precharge contactor 18 and the main contactor (+) 16 are operating normally. When only one of the precharge contactor 18 and the main contactor (+) 16 is welded and the main contactor (−) 17 is operating normally, the contactor is in the state shown in FIG. The voltage of VC is as shown in FIG.

  In steps S7 to S15, it is confirmed whether or not both the positive contactor 16 and / or the precharge contactor 18 and the negative contactor 17 are welded. If the vehicle start-up in step S1 is performed immediately after the previous vehicle stop, if the discharge of the charge of the smoothing capacitor 22 has not ended, all of the positive side and negative side contactors 16, 18 and 17 are welded. Even if it is not normal, VB−VC> ΔV1 may be negatively determined in step S6. Even in this case, when the contactors on the positive electrode side and the negative electrode side are not welded normally, if all the contactors are turned off in step S5, the charge of the smoothing capacitor 22 is discharged through the discharge resistor 23, The voltage VC gradually decreases. Accordingly, by confirming the decrease in the voltage VC, it is possible to confirm whether or not both the positive contactor 16 and / or 18 and the negative contactor 17 are welded.

In step S7, it is determined whether or not a sufficient time (time T) has elapsed since the last vehicle stop in step S1. If sufficient time has not elapsed since the previous vehicle stop, the process proceeds to step S8.
After a sufficient time has elapsed since the previous vehicle stop (time T), when the vehicle is started in the current step S1, the positive and negative contactors 16 and / or 18 and 17 are welded together. Otherwise, all contactors 16-18 are open. Therefore, the electric charge of the smoothing capacitor 22 is sufficiently discharged, and the voltage VC between the terminals of the smoothing capacitor 22 becomes almost zero. This time T is appropriately determined by a time constant τ 1 determined by the resistance value R 1 of the discharge resistor 23 and the capacitance C of the smoothing capacitor 22.
On the other hand, if a negative determination is made in step S6 even though a sufficient time has elapsed since the previous vehicle stop, the positive contactor 16 and / or 18 and the negative contactor 17 are welded together. Therefore, the process from step S8 to S12 is not necessary, and the process may proceed from step S7 to step S13.

In step S8, the inter-terminal voltage VC of the smoothing capacitor 22 measured by the voltage sensor 21 is set to the initial value VC0, and the counter is set to zero. Following this, the processing from step S9 to S12 is repeated a predetermined number of times.
In step S9, the process waits until a predetermined time Δt elapses. In step S10, the voltage VC between the terminals of the smoothing capacitor 22 is measured again, and it is determined whether the difference (VC0−VC) from the initial value VC0 is larger than the predetermined voltage difference ΔV2. To do.
If the difference from the initial value VC0 is larger than the predetermined voltage difference ΔV2, the charge of the smoothing capacitor 22 is normally discharged, that is, the positive contactors 16 and 18 and the negative contactor 17 are not welded together. As shown in FIG. 2, the second half (1B) of the abnormality diagnosis flow in FIG. 2 is executed.
If the difference between the initial value VC0 and the measured inter-terminal voltage VC is not greater than the predetermined voltage difference ΔV2, the process proceeds to step S11.

In step S11, it is determined whether or not the count exceeds a predetermined value N. If the count exceeds the predetermined value N, the process proceeds to step S13. If the count is less than or equal to the predetermined value N, the count is incremented by 1 in step S12, and the process returns to step S9. That is, steps S9 and S10 are repeated a predetermined number of times. The predetermined value N is set in consideration of the amount of decrease ΔV in the voltage VC between the terminals of the smoothing capacitor 22 during the waiting time Δt in step S9 and the determination threshold value ΔV2 in step S10. For example, if N, Δt, and ΔV2 are set so as to satisfy the relationship of the following expression (2) using the above time constant τ, the voltage decrease of ΔV2 or more can be obtained by repeating the processes of steps S9 and S10 N times. I can confirm.
ΔV = VC0 · exp (−N · Δt / τ1) ≧ ΔV2. . . (2)
Note that ΔV2 may be set to such an extent that at least a significant voltage difference can be reliably determined in consideration of noise of the voltage measurement system using the voltage sensor 21 and voltage detection resolution. If ΔV2 can be reduced, the determination in step S10 can be made with a small voltage difference, so that abnormality diagnosis can be performed at high speed.

  If the count is equal to or greater than the predetermined value N in step S11, the smoothing capacitor 22 is not sufficiently discharged. That is, in step S13, the positive contactor (main contactor (+) 16 or precharge contactor 18) and the negative contactor are discharged. It is determined that both of the contactors (main contactor (−) 17) are welded, the positive contactor welding abnormality flag FP = 1 (= ON), and the negative contactor welding abnormality flag FN = 1 (= ON).

In step S14, information that the positive contactor 16 and / or 18 and the negative contactor 17 are welded together, that is, the welding abnormality flags FP and FN, is transmitted to the vehicle controller 7 that is the host controller, and the process ends. (Step S15).
The vehicle controller 7 stores the received welding abnormality flags FP and FN in a nonvolatile memory area (not shown). At the same time, when one of the welding abnormality flags FP and FN is ON (= 1), 1 is set in another flag FC that the welding abnormality has occurred in the contactor. The content of the flag FC is transmitted from the host controller 7 to the control device 5 or 6 that performs abnormality diagnosis in the process after the vehicle is started, for example, the process in step S3.

(Part of flow 1B in FIG. 2)
When the condition of VB−VC> ΔV1 is satisfied in step S6, that is, when the value of the inter-terminal voltage VC of the smoothing capacitor 22 is very small with respect to the inter-terminal voltage VB of the battery system 4 (as shown in FIG. 4). If normal, VC = 0V), steps S16 to S30 (flow 1B) are executed.
In step S16, as described above, 1 is set in the contactor welding abnormality flag FC based on the data transmitted from the vehicle controller 7 which is the host controller to the control device 5 or 6 in the process of step S3. Make sure that If FC = 1, the contents of the positive side contactor welding abnormality flag FP stored in the nonvolatile memory of the control device are read (step S17).

If a positive determination is made in step S6 or step S10, the process proceeds to step S16. At this time, both the positive contactor (main contactor (+) 16 or precharge contactor 18) and the negative contactor (main contactor (-) 17) are not welded together. The information in step S17, that is, the positive electrode side contactor welding abnormality flag FP is used to determine whether the positive electrode side or negative electrode side contactor is welded in the processing after step S18.
Incidentally, in correspondence with the processing in the following steps S18 to S24, FIG. 5 shows a timing chart when the main contactor (−) 17 is welded, and FIG. 6 shows all contactors for comparison with this. A timing chart in the case of normal operation without welding is shown.

  In step S18, the voltage VC between the terminals of the smoothing capacitor 22 is measured. The time at this time is t2, and the measured voltage across the smoothing capacitor is VC (t2). Following the voltage measurement between the terminals, the precharge contactor 18 is turned on for a predetermined time in step S19, and then the voltage VC between the terminals of the smoothing capacitor 22 is measured at time t3 in step S20. The time at this time is t3, and the measured voltage across the smoothing capacitor 22 is VC (t3). Following this, the precharge contactor 18 is turned off (step S21).

In step S22, the inter-terminal voltage VC (t2) and VC (t3) of the smoothing capacitor 22 are compared by the equation (3). It is determined whether or not (VC (t3) −VC (t2)) is a predetermined value ΔV3 or more. If a positive determination is made in step S22, it is determined that the main contactor (−) 17 is welded, and the process proceeds to step S24. Alternatively, if (VC (t3) −VC (t2)), which is the difference between the capacitor terminal voltages VC (t2) and VC (t3), is smaller than ΔV3, the process of step S24 is performed.
VC (t3) −VC (t2) ≧ ΔV3. . . (3)

As described in the processing in step S16 above, when step S16 is executed, the positive contactor (main contactor (+) 16 or precharge contactor 18) and the negative contactor (main contactor (-) 17). Both are not welded together.
Therefore, for example, when the main contactor (−) 17 is welded, the positive contactors (the main contactor (+) 16 and the precharge contactor 18) are operating normally. FIG. 5 shows a timing chart of each contactor state and the smoothing capacitor terminal voltage VC in the diagnostic processing steps S16 to S28 in this state.

The smoothing capacitor terminal voltages VC (t2) and VC (t3) shown in FIG. 5 are examples of the rise of the smoothing capacitor terminal voltage VC when the main contactor (−) is welded.
When the precharge contactor 18 is turned on after measuring the smoothing capacitor terminal voltage VC (t2) at the time t2, if the main contactor (-) 17 is welded, the battery system 4 is connected via the limiting resistor 18. Current flows, the smoothing capacitor 22 is charged, the voltage between the terminals rises, and becomes VC (t3) at time t3. Therefore, it is determined that the main contactor (−) 17 is welded using the above equation (3).

Although not described in detail, the time constant τ2 of the rise of the voltage VC between the terminals of the smoothing capacitor 22 from time t2 to t3 is equal to the combined resistance of the resistance value R1 of the discharge resistor 23 and the resistance value R2 of the limiting resistor 19. It depends on the time constant τ 2 determined by the capacitance C of the capacitor 22. In order to perform the determination based on the expression (3) in step S22, the following physical constants may be considered.
That is, (1) between the terminals of the smoothing capacitor 22 based on the elapsed time from time t2 to t3, the time constant τ2, and the divided voltage (VB · R1 / (R1 + R2)) of the inter-terminal voltage VB of the battery system 4 Based on the rise in voltage VC (VC (t2) → VC (t3)) and (2) voltage detection resolution in consideration of noise of the voltage measurement system including the voltage sensor 21, ΔV3 and the elapsed time from time t2 to t3 What is necessary is just to set time suitably.
As described in step S11 above, if ΔV3 can be reduced, the determination in step S22 can be performed at high speed. In FIG. 5, the vehicle drive preparation process is performed after time t4, and the description thereof is omitted.

  If an affirmative determination is made in step S22, the process proceeds to step S23, and the negative contactor welding abnormality flag FN is turned on, assuming that the main contactor (-) 17 is welded.

If a negative determination is made in step S22, the process proceeds to step S24, and it is confirmed whether the contactor welding abnormality flag FP or FN is turned on in the process up to step S23. If either the contactor welding abnormality flag FP or FN is on, the process proceeds to step S25, and the welding abnormality flag information is transmitted to the vehicle controller 7, which is the host controller.
Furthermore, abnormality diagnosis is complete | finished by step S26.

  If a negative determination is made in step S24, it is determined that all contactors are not welded and are operating normally (step S27), and the contactor welding abnormality diagnosis is terminated (step S28).

(Driving of the vehicle after the first abnormality diagnosis)
When it is determined that all of the contactors 16 to 18 are operating normally (step S28), the positive contactor (main contactor (+) 16 or precharge contactor 18) is completed after the first abnormality diagnosis. ) And the negative contactor (main contactor (−) 17) are closed, and DC power is supplied from the battery system 4 to the inverter 3. Further, in the first abnormality diagnosis, even if it is determined that any of the contactors 16 to 18 on the positive electrode side or the negative electrode side is abnormal in welding (steps S15 and S26), the vehicle is driven. Therefore, there is a case where DC power is supplied to the inverter in a state of abnormal welding.
In FIGS. 5 and 6, the timing chart after the time t <b> 4 is a timing chart when the vehicle is driven following the first abnormality diagnosis, but the description is omitted. Note that the time constant of the decrease of the smoothing capacitor terminal voltage VC after time t3 in FIG. 5 is τ1 described above.

(Second abnormality diagnosis)
The abnormality diagnosis performed by opening and closing the main contactor (+) 16 and the main contactor (−) 17 is executed as the second abnormality diagnosis in the present invention at the end of driving of the vehicle.
Since this second abnormality diagnosis is equivalent to a conventional abnormality diagnosis, it will be briefly described.

  FIG. 8 is a diagnostic processing timing chart (S51 to S62) when the main contactor (+) 16 of the positive side contactors (main contactor (+) 16 and precharge contactor 18) is abnormally welded. 6 is a timing chart of the state of each contactor and the voltage VC between terminals of the smoothing capacitor 22; FIG. 9 is a timing chart when all the contactors are operating normally.

  When only the precharge contactor 18 that is the positive electrode side contactor has a welding abnormality, the main contactor (+) 16 is turned off, as can be seen from the description in step S6 above, the total voltage of the battery system Since there is a difference between VB and the voltage VC between the smoothing capacitor terminals, it is possible in principle to determine which one of the main contactor (+) 16 and the precharge contactor 18 is welded by detecting this difference. However, since the current flowing through the precharge contactor 18 is limited by the limiting resistor 19, it is rare that abnormal welding occurs, and the inter-terminal voltage VB of the battery system 4 also changes depending on the state of charge. Therefore, it is actually difficult to determine which of the main contactor (+) 16 and the precharge contactor 18 is welded, and here again, the welding abnormality of the positive contactor (main contactor (+) 16 and precharge contactor 18) is detected. Judgment is made.

  In step S51, when the ignition switch 8 is turned off to stop the vehicle (time t8), the contactor welding abnormality diagnosis when the vehicle stops is started, and in step S52, the control device (battery controller 5, cell controller 11, motor) is started. The stop process of the controller 6) is started. This stop process includes, for example, a process of transmitting information on the state of charge of the battery system 4 to the vehicle controller 7 that is a host controller. Further, the welding diagnosis process after step S53 is also executed as part of this stop process.

  In step S53, welding diagnosis is started, and in step S54, control is performed to turn on the main contactor (+) 16 and the main contactor (-) 17 and turn off the precharge contactor 18 (time t9). Since the vehicle is in a driving state, each contactor is in such a state if it is normal, but such control is performed just in case to determine the state of each contactor.

  In step S55, the voltage VC between the terminals of the smoothing capacitor 22 is measured. The time at this time is set to t10, and the measured voltage between terminals is set to VC (t10). Subsequently, in step S56, the main contactor (+) 16 is turned off. In step S57, the voltage across the terminals of the smoothing capacitor 22 is measured. The time at this time is set to t11, and the voltage between terminals is set to VC (t11).

If the main contactor (+) 16 is operating normally, as shown in FIG. 9, when the main contactor (+) 16 is turned off after the measurement of the voltage VC (t10) between the terminals of the smoothing capacitor 22 at time t10, Since the electric charge of the smoothing capacitor 22 is discharged by the discharge resistor 23, the inter-terminal voltage VC gradually decreases with the above-described time constant τ1 after time t10.
On the contrary, when the main contactor (+) 16 has a welding abnormality, as shown in FIG. 8, the voltage VC between the terminals of the smoothing capacitor 22 is until time t11 when the main contactor (−) 17 is turned off. It does not decrease and shows the same voltage as the inter-terminal voltage VB of the battery system 4.

In step S58, when the inter-terminal voltages VC (t10) and VC (t11) of the smoothing capacitor 22 satisfy the following expression (4), the positive contactor (main contactor (+) 16 or precharge contactor 18) is welded. Proceed to step S59 because it is abnormal.
VC (t10) −VC (t11) ≧ ΔV4. . . (4)
The time difference between the times t10 and t11 and the threshold value ΔV4 in the equation (4) are appropriately set in consideration of the magnitude of voltage decrease and the resolution in voltage measurement, as in the description of ΔV1 to ΔV3.

  In step S59, it is assumed that the positive contactor (main contactor (+) 16 or precharge contactor 18) has a welding abnormality, and 1 is set to the welding abnormality flag FP.

In step S60, control is performed to turn off all contactors (omitted in FIGS. 8 and 9).
This completes the welding diagnosis when the vehicle is stopped (second diagnosis) (step S61).

In the first embodiment described above, the following operational effects can be achieved.
(1) The welding abnormality diagnosis of the positive contactor and the negative contactor is performed at the time of starting the vehicle and stopping the vehicle. Therefore, it can start in a short time when the vehicle is started.

(First modification)
In the embodiment of the present invention described above, the series circuit of the precharge contactor 18 and the limiting resistor 19 (resistance value R2) is described as being provided in parallel to the main contactor (+) 16.
The series circuit of the precharge contactor 18 and the limiting resistor 19 (resistance value R2) may be provided in parallel to the main contactor (−).

In the first modified embodiment, the positive electrode side contactor and the negative electrode side contactor diagnosed by the welding diagnosis described above are interchanged. That is, in the first diagnosis above, the welding abnormality of the main contactor (+) is diagnosed. In step S17 of FIG. 2, the negative contactor welding abnormality flag FN is read, and in step S23, the welding abnormality flag FP of the main contactor (+) 16 is set.
Further, the control and the actual state of the main contactor (+) 16 and the main contactor (−) 17 in FIGS. 3 to 6 are interchanged.

  Further, in the welding diagnosis (second abnormality diagnosis) when the vehicle is stopped, the main contactor (-) is turned off in step S56, and the welding abnormality flag of the main contactor (-) is set to 1 in step S59. 8 and 9, as in FIGS. 3 to 6, the control and actual state of the main contactor (+) 16 and the main contactor (−) 17 are switched.

(Second modification)
As shown in FIG. 10, a discharge resistance relay 24 may be provided in series with the discharge resistance 23. In FIG. 10, the controllers and motors are omitted from FIG.
By turning on / off the discharge resistance relay 24, the discharge resistance 23 can be connected to the smoothing capacitor in parallel, or this connection can be released.

As can be seen from the description in step S6 and the description of the first part of the second abnormality diagnosis, in FIG. 10, the main contactor (+) 16 is not welded, and the precharge contactor 19 and the main contactor are not welded. When (−) is welded, when the discharge resistance relay 24 is turned on, the voltage VB between the terminals of the battery system 4 is divided by the limiting resistance R2 and the discharge resistance R1, and the smoothing capacitor 22 detected by the voltage sensor 21 The terminal voltage VC decreases. The discharge resistance relay 24 can be turned on / off without changing the state of the main contactor (+) 16 and the precharge contactor 18 in a state where the driving of the vehicle is stopped and the inverter is not operating. The difference in voltage VC between terminals of smoothing capacitor 22 when relay 24 is turned on / off, that is, the difference between voltage VB between terminals of battery system 4 and voltage VC between terminals of smoothing capacitor 22 when relay 24 is turned on is stabilized. Can be detected.
Therefore, when only the precharge contactor 19 is welded, the precharge contactor 19 is welded by detecting the difference between the smoothing capacitor terminal voltages VC when the discharge resistance relay 24 is on and off. Can be detected.

When the main contactor (+) 16 is welded, even if the precharge contactor 18 and the discharge resistance relay 24 are turned on / off in such a manner, there is almost no difference in the voltage VC between the terminals of the smoothing capacitor 22. Therefore, conversely, in such a case, it can be determined that at least the main contactor (+) 16 is welded.
Originally, a large current is prevented from flowing through the precharge contactor 18 by the limiting resistor 19, and therefore, the possibility that the precharge contactor 18 becomes abnormally welded is considered to be smaller than the main contactor (+) 16. If the difference between the terminals VC of the smoothing capacitor 22 due to voltage division between the limiting resistor R2 and the discharge resistor R1 is not detected even if the discharge resistor relay 24 and the precharge contactor 18 are turned on / off in various combinations, the main contactor It can be estimated that the possibility of (+) 16 welding abnormality is high.

  As described above, the welding abnormality of the positive side contactor and the negative side contactor is diagnosed, and if a contactor abnormality is detected, this is transmitted to the host control device (vehicle controller 7) and is sent to the vehicle driver. Notify welding abnormality. When an abnormality is detected in this way, for example, by replacing a welded part (contactor), unnecessary discharge of the battery system can be avoided, and energy is wasted without impairing the life of the battery system. Use can be reduced.

  The above description is examples of the embodiments and modified embodiments of the present invention, and the present invention is not limited to these embodiments and modified examples. Those skilled in the art can implement various modifications without impairing the features of the present invention.

1 ... Motor (rotary electric machine)
2 ... Electric drive device 3 ... Inverter 4 ... Battery system (assembled battery)
5 ... Battery controller (control device)
6. Motor controller (control device)
7 ... Vehicle controller (high-order control device)
8 ... Ignition switch 9 ... Low voltage battery 10 ... Secondary battery module 11 ... Cell controller 12 ... Communication path 13 ... Service disconnect switch (SDSW)
14 ... Positive power line 15 ... Negative power line 16 ... Main contactor (+)
17 ... Main contactor (-)
18 ... Precharge contactor 19 ... Limiting resistor 20 ... Voltage sensor 21 ... Voltage sensor 22 ... Smoothing capacitor 23 ... Discharge resistor 24 ... Discharge resistor relay

Claims (10)

A positive contactor provided on a positive power line connecting the battery and the inverter;
A negative contactor provided on a negative power line connecting the battery and the inverter;
A precharge contactor and a limiting resistor connected in parallel to each other and connected in series to the positive contactor;
A smoothing capacitor interposed in parallel with the inverter between the positive power line and the negative power line;
Capacitor voltage detection means for measuring a voltage across the terminals of the smoothing capacitor;
In an abnormality detection device for a power supply device comprising control means for controlling an opening / closing command of the positive electrode contactor, the negative electrode contactor, and the precharge contactor,
The control means outputs either a positive contactor or a negative contactor including the positive contactor and the precharge contactor at a timing of outputting a start-up command for starting the vehicle to the positive contactor, the negative contactor, and the precharge contactor. One of the positive contactor and the negative contactor is diagnosed at the timing when a stop command for stopping the vehicle is output to the positive contactor, the precharge contactor, the negative contactor, and the precharge contactor. An abnormality detection device for a power supply device, comprising diagnostic means for diagnosing the other welding abnormality. In the abnormality detection apparatus of the power supply device according to claim 1,
The diagnostic means includes
Negative diagnosis means for diagnosing welding abnormality of the negative contactor at the timing of outputting the startup command, and positive diagnosis means for diagnosing welding abnormality of the positive contactor at the timing of outputting the stop time command An abnormality detection device for a power supply device comprising: In the abnormality detection apparatus of the power supply device according to claim 2,
The negative side diagnosis means outputs a command for closing the precharge contactor at a timing of outputting the start time command and detects a voltage between terminals of the smoothing capacitor by the capacitor voltage detection means. A command to open the precharge contactor is output and the voltage between the terminals of the smoothing capacitor is detected by the capacitor voltage detection means, and the welding of the negative contactor is performed based on the difference between the detected voltages between the terminals of the two smoothing capacitors. An abnormality detection device for a power supply device, characterized by determining an abnormality. In the abnormality detection apparatus of the power supply device according to claim 3,
The negative side diagnosis means is configured such that a voltage between terminals of the smoothing capacitor when a command to open the precharge contactor is output is a voltage between terminals of the smoothing capacitor when a command to close the precharge contactor is output. If it is also lowered, it is determined that the negative electrode contactor is abnormally welded. In the abnormality detection apparatus of the power supply device according to claim 2 or 3,
The control means includes a storage unit that stores a diagnosis result of the positive contactor,
An abnormality detection device for a power supply device, wherein the diagnosis result of the positive contactor is read out at the timing of outputting the startup command, and it is determined that the positive contactor has a welding abnormality. In the abnormality detection apparatus of the power supply device according to any one of claims 3 to 5,
The positive side diagnosis means detects the voltage across the terminals of the smoothing capacitor by the capacitor voltage detection means at the timing of outputting the stop time command, and then outputs a command to open the positive side contactor and the capacitor A voltage detecting unit detects a voltage between terminals of the smoothing capacitor, and determines a welding abnormality of the positive contactor based on a difference between the detected voltages between two terminals of the smoothing capacitor. Anomaly detection device. In the abnormality detection apparatus of the power supply device according to claim 6,
The positive-side diagnosis means does not reduce the voltage across the smoothing capacitor when the command to open the positive contactor is output from the voltage across the smoothing capacitor before outputting the command to open the positive contactor. When this is the case, it is determined that the positive electrode side contactor is abnormally welded. In the abnormality detection apparatus of the power supply device according to any one of claims 1 to 7,
Battery voltage detection means for measuring the total voltage of the battery,
The control means controls the positive contactor, the negative contactor and the precharge contactor to be all open at the timing when the start-up command is output, and the battery inter-terminal voltage and the smoothing capacitor terminal An abnormality detection device for a power supply apparatus, wherein each of the inter-voltages is detected, and when the difference between the voltages between the terminals is smaller than a predetermined value, it is determined that both the positive contactor and the negative contactor are abnormal in welding. . A positive contactor provided on a positive power line connecting the battery and the inverter;
A negative contactor provided on a negative power line connecting the battery and the inverter;
A precharge contactor and a limiting resistor connected in parallel to each other and connected in series to the positive contactor;
A smoothing capacitor interposed in parallel with the inverter between the positive power line and the negative power line;
Capacitor voltage detection means for measuring a voltage across the terminals of the smoothing capacitor;
In an abnormality detection device for a power supply device comprising control means for controlling an opening / closing command of the positive electrode contactor, the negative electrode contactor, and the precharge contactor,
Before the negative contactor and the positive contactor are turned on and the DC power of the battery is supplied to the inverter, the voltage between the terminals of the smoothing capacitor when only the precharge contactor is turned off is changed to the precharge contactor. An abnormality detection device for a power supply device, wherein the negative electrode contactor is determined to have a welding abnormality when it decreases when the power is turned off. An electric drive device for a rotating electrical machine comprising the abnormality detection device for a power supply device according to any one of claims 1 to 9.

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