JP2022164117A - On-vehicle power supply device - Google Patents

Abstract

To determine deterioration of a power storage unit without consuming dark current.SOLUTION: An on-vehicle power supply device 1 reduces the voltage of a power storage unit 2 in a discharge mode when receiving a vehicle start-up signal S1 and increases the voltage of the storage unit 2 in a charge mode. At least any one of the charge mode and the discharge mode is provided with a stop period TS for stopping a discharge operation or a charge operation. The on-vehicle power supply device detects the potential difference VP between a stop period voltage VS of the power storage unit 2 in the stop period TS and the operating voltage VD of the power storage unit 2 immediately before or immediately after the stop period TS, when the stop period TS is provided in the discharge mode, obtains a first resistance value R1 from a first current and the potential difference VP between the operating voltage VD and the stop period voltage VS, when the stop period TS is provided in the charge mode, obtains a second resistance value R2 from the first current and the potential difference VP, and when the first resistance value R1 or the second resistance value R2 is equal to or more than a threshold resistance value RTH, sends a warning signal.SELECTED DRAWING: Figure 1

Description

The present invention relates to an in-vehicle power supply device used in various vehicles.

A conventional vehicle-mounted power supply device will be described below. A conventional on-vehicle power supply device has a function capable of detecting a deterioration state of a power storage unit included in the on-vehicle power supply device. Also, a function is provided to issue a warning signal when a deterioration state is detected.

For example, Patent Document 1 is known as prior art document information related to the invention of this application.

JP-A-2008-66390

However, in the conventional vehicle-mounted power supply device, the deterioration of the power storage unit is determined at a timing when the power supply is not required, such as after the vehicle starts and stops. In this case, it is necessary to supply electric power to the vehicle-mounted power supply device for deterioration detection while the vehicle is stopped.

As a result, there is a problem that the vehicle battery may deteriorate due to the dark current for operating the vehicle-mounted power supply device.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to enable determination of deterioration of a power storage unit without consuming dark current.

In order to achieve this object, the present invention provides a power storage unit, a charging/discharging circuit capable of charging and discharging the power storage unit and capable of discharging the power of the power storage unit in an emergency, and the power storage unit. and a control unit capable of detecting the voltage of and the current flowing through the charging/discharging circuit, receiving a vehicle start signal, and transmitting a warning signal, wherein the control unit receives the vehicle start signal the charging/discharging circuit is operated to discharge with a first current in a discharging mode to lower the voltage of the storage unit from the first voltage to a second voltage; and the charging/discharging circuit is charged with a second current in a charging mode. operate to increase the voltage of the power storage unit from the second voltage to the third voltage;
At least one of the charging mode and the discharging mode is provided with a stop period for stopping the discharging operation or the charging operation, and the control unit controls the stop period voltage of the power storage unit in the stop period, detecting a potential difference between the operating voltage of the power storage unit immediately before or after the stop period, and obtaining a first resistance value from the potential difference and the first current when the stop period is provided in the discharge mode, When the suspension period is provided in the charging mode, a second resistance value is obtained from the potential difference and the first current, and when the first resistance value or the second resistance value is equal to or greater than a threshold resistance value, It is characterized by transmitting the warning signal.

According to the present invention, it is possible to perform the deterioration determination for the power storage unit of the on-vehicle power supply device while the vehicle is running. In addition, it is possible to determine the deterioration of the power storage unit in a state where no failure occurs in discharging power in an emergency.

1 is a circuit block diagram showing the configuration of an on-vehicle power supply device according to an embodiment of the present invention; FIG. 1 is a first operating curve diagram showing the operation of the vehicle-mounted power supply device according to the embodiment of the present invention; A second operating curve diagram showing the operation of the vehicle-mounted power supply device according to the embodiment of the present invention. 1 is a circuit block diagram showing the configuration of a vehicle equipped with an on-vehicle power supply device according to an embodiment of the present invention;

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment)
FIG. 1 is a circuit block diagram showing the configuration of an on-board power supply device 1 according to an embodiment of the present invention, and FIG. 2 is a first operating curve diagram showing the operation of the on-board power supply device 1 according to an embodiment of the present invention. FIG. 3 is a second operating curve diagram showing the operation of the vehicle-mounted power supply device 1 according to the embodiment of the present invention.

In-vehicle power supply device 1 includes power storage unit 2 , charging/discharging circuit 3 , and control unit 4 . Charging/discharging circuit 3 can charge power storage unit 2 and discharge power stored in power storage unit 2, and can discharge power stored in power storage unit 2 particularly in an emergency. The control unit 4 can detect the voltage stored in the power storage unit 2, detect the current flowing through the charging/discharging circuit 3, receive the vehicle start signal S1, and transmit the warning signal S2.

The control unit 4 can cause the charge/discharge circuit 3 to operate in the discharge mode and the charge mode. When the vehicle start signal S1 is received, the control unit 4 causes the charging/discharging circuit 3 to discharge with the first current I1 in the discharge mode, thereby changing the voltage of the electric storage unit 2 from the first voltage V1 to the second voltage V2. and lower. Further, the control unit 4 causes the charging/discharging circuit 3 to perform the charging operation with the second current I2 in the charging mode to increase the voltage of the power storage unit 2 from the second voltage V2 to the third voltage V3.

Here, the control unit 4 operates the charge/discharge circuit 3 so that at least one of the charge mode and the discharge mode is provided with a stop period TS during which the discharge operation in the discharge mode or the charge operation in the charge mode is stopped. Then, the control unit 4 controls the stop period voltage VS of the power storage unit 2 during the stop period TS, the voltage of the power storage unit 2 immediately before the stop period TS or immediately after the stop period TS, which is the first current I1 or the second current I2. Detects the potential difference VP from the operating voltage when the current is flowing.

Here, when the stop period TS is provided in the discharge mode, the control unit 4 obtains the first resistance value R1 from the potential difference VP and the first current I1, and when the stop period TS is provided in the charge mode, the potential difference The controller 4 obtains the second resistance value R2 from VP and the second current I2. Then, when the first resistance value R1 or the second resistance value R2 is equal to or greater than the threshold resistance value RTH, the controller 4 issues a warning signal S2.

With the above configuration and operation, the on-vehicle power supply 1 can operate when it receives the vehicle activation signal S1, in other words, when the vehicle on which the on-vehicle power supply 1 is mounted is activated. Deterioration determination for the power storage unit 2 of the in-vehicle power supply device 1 can be performed in this state. For this reason, in-vehicle power supply device 1 does not need electric power corresponding to dark current for determining deterioration of power storage unit 2 when the vehicle is not started and vehicle start signal S<b>1 is not received. Therefore, it is possible to determine the deterioration of power storage unit 2 without imposing a burden on the vehicle battery. Furthermore, the on-vehicle power supply 1 can carry out the deterioration determination for the power storage unit 2 in a state in which it is possible to respond to an emergency and in a state in which there is no failure to discharge electric power in an emergency. When the power storage unit 2 is degraded, it is possible to warn the passengers and the like of the state of degradation so that they can recognize the state.

The details of the configuration and operation of the vehicle-mounted power supply device 1 will be described below with reference to circuit block diagrams showing the configuration of a vehicle equipped with the vehicle-mounted power supply device 1 according to the embodiment of the present invention in FIGS. 1, 2, 3, and 4. will be used to explain.

The in-vehicle power supply 1 mounted on the vehicle body 6 of the vehicle 5 can receive power supply from the vehicle battery 7 through the input end 8 of the in-vehicle power supply 1 . In-vehicle power supply 1 can also supply power to vehicle load 10 through output end 9 of in-vehicle power supply 1 . Here, the vehicle load 10 corresponds to a door unlocking motor, a shift changing motor, and the like. Even when the vehicle 5 encounters an unexpected situation and the vehicle battery 7 fails, power is temporarily supplied from the vehicle-mounted power supply 1 to ensure the safety of the vehicle 5 and passengers. In order to do so, the vehicle load 10 is enabled. The detection that the vehicle 5 has encountered an unexpected situation is an emergency signal transmitted by a vehicle body control unit (not shown) of the vehicle 5, or an abnormal value in which the voltage of the vehicle battery 7 is below a threshold value while the vehicle 5 is being started. may be implemented by lowering the When the vehicle 5 is in a normal state, the vehicle load 10 can operate by being supplied with electric power from the vehicle battery 7 through the normal conductor path 11 .

In-vehicle power supply device 1 includes power storage unit 2 , charging/discharging circuit 3 , control unit 4 , input terminal 8 and output terminal 9 . The charging/discharging circuit 3 has a charging circuit 12 and a discharging circuit 13 . A charging circuit 12 is connected to the input terminal 8 and the storage unit 2 . The charging circuit 12 can charge the power storage unit 2 with the electric power of the vehicle battery 7 . A discharge circuit 13 is connected to the output terminal 9 and the storage unit 2 . Discharge circuit 13 can discharge and supply the electric power stored in power storage unit 2 to vehicle load 10 .

Control unit 4 can detect the voltage stored in power storage unit 2 and the current flowing through charging circuit 12 and discharging circuit 13 . A current flowing through the charging circuit 12 and the discharging circuit 13 is detected using a voltage output from a Hall element arranged in the charging circuit 12 and the discharging circuit 13 . Alternatively, the current flowing through the charging circuit 12 and the discharging circuit 13 is detected using the potential difference occurring across the shunt resistors arranged in the charging circuit 12 and the discharging circuit 13 .

Further, the activation signal transmission unit 14 mounted on the vehicle body 6 transmits the vehicle activation signal S1 when the vehicle 5 is activated, and the control unit 4 can receive the vehicle activation signal S1. It may be the start signal transmitter 14, a vehicle body control unit (not shown) of the vehicle 5, or a vehicle start switch (not shown). Further, the control section 4 can transmit a warning signal S2 to the warning display section 15 mounted on the vehicle body 6 .

Here, when the vehicle 5 is in a normal state (a state in which the vehicle 5 has not encountered an unexpected situation and the vehicle battery 7 is not in a failed state and can normally output electric power), the control unit 4 operation will be described. First, when the passenger starts the vehicle 5 at time TG0, the vehicle control unit (not shown) transmits the vehicle start signal S1. At this time, the vehicle battery 7 can normally supply power to the vehicle load 10 through the conductor path 11 and the vehicle battery 7 can supply power to the vehicle power supply device 1 .

At time TG0, control unit 4 operates charging circuit 12 to start charging power storage unit 2 in response to receiving vehicle activation signal S1. Power storage unit 2 was charged at initial voltage V0 at a level at which deterioration in power storage unit 2 hardly progresses before time TG0 when vehicle 5 was not started. At time TG0, the charging circuit 12 starts operating, so that the charging current IG0 flows through the charging circuit 12 from TG0 to TG1, and the power storage unit 2 is charged to increase the voltage from the initial voltage V0 to the first voltage V1. Rise. Here, the first voltage V1 is such that even if the vehicle battery 7 fails when the vehicle 5 encounters an unexpected situation as described above, the electric power stored in the power storage unit 2 remains at the discharge circuit 13. Any value that allows the vehicle load 10 to operate by being discharged through the current may be used.

The period from TG0 to TG1 is very short, in other words, the charging of power storage unit 2 is completed in a short time. From time TG1 to time T1, basically no current flows in the charging circuit 12 or the discharging circuit 13, but since the first voltage is maintained in the power storage unit 2, weak power is charged. It may be supplied from circuit 12 to power storage unit 2 .

Next, at time T1, control unit 4 operates discharge circuit 13 to discharge electric storage unit 2 with first current I1, thereby reducing the voltage of power storage unit 2 from first voltage V1 to second voltage V2. It is time T2 that the voltage of power storage unit 2 becomes the second voltage V2. The operation of the in-vehicle power supply device 1 during the period from time T1 to time T2 corresponds to the discharge mode. Here, the second voltage V2 is set to a value lower than the first voltage V1, but like the first voltage V1, the second voltage V2 is also set to the vehicle battery voltage when the vehicle 5 encounters an unexpected situation. 7 is in a failed state, the power stored in power storage unit 2 is a value that can be stepped up or stepped down by discharge circuit 13, and the power is discharged through discharge circuit 13. Any value that allows the load 10 to operate may be used. Also, naturally, the second voltage V2 is higher than the initial voltage V0.

Next, at time T2, control unit 4 operates charging circuit 12 to charge it with second current I2, thereby increasing the voltage of power storage unit 2 from second voltage V2 to third voltage V3. It is time T3 that the voltage of power storage unit 2 becomes the third voltage V3. The operation of the vehicle-mounted power supply device 1 during the period from time T2 to time T3 corresponds to the charging mode. Here, the third voltage V3 may have a higher value than the second voltage V2, and the third voltage V3 may have substantially the same value as the first voltage V1.

Here, as shown in FIG. 2, a case where a stop period TS for stopping the discharge by the first current I1 is provided in the period from T1 to T2 in the discharge mode will be described. The stop period TS corresponds to the period from time T11 to time T12.

The control unit 4 detects the stop period voltage VS of the power storage unit 2 during the stop period TS. Further, the control unit 4 detects an operating voltage V11, which is the voltage of the power storage unit 2 immediately before the stop period TS, or an operating voltage V12, which is the voltage of the power storage unit 2 immediately after the stop period TS. In other words, the operating voltage V11 at T11 at which the state in which the first current I1 flows is switched to the stop period TS, or at T12 at which the first current I1 flows again from the stop period TS. corresponds to the operating voltage V12 of The operating voltage V11 and the operating voltage V12 are substantially the same operating voltage VD.

Then, the control unit 4 calculates the potential difference VP based on the stop period voltage VS and the operating voltage VD. Further, control unit 4 obtains first internal resistance value R1, which is the internal resistance value of power storage unit 2, by calculation based on potential difference VP and first current I1. More specifically, the control unit 4 first obtains the potential difference VP, which is the difference between the stop period voltage VS and the operating voltage V11 or the difference between the stop period voltage VS and the operating voltage V12, by calculation. Furthermore, the control unit 4 obtains a first internal resistance value R1, which is a value obtained by dividing the potential difference VP by the first current I1, by calculation. Then, the controller 4 performs a comparison operation between the first internal resistance value R1 and the threshold resistance value RTH previously stored in the controller 4 . Further, when the first internal resistance value R1 is equal to or greater than the threshold resistance value RTH, the control unit 4 determines that the deterioration of the power storage unit 2 is progressing. When control unit 4 determines that the deterioration of power storage unit 2 is progressing, control unit 4 sends a warning signal S2 to warning display unit 15 to warn passengers that power storage unit 2 is in a deteriorated state.

Here, it is desirable that an electric double layer capacitor or a lithium ion capacitor capable of discharging at a high current density is applied to the power storage unit 2 . As the electric double layer capacitor and the lithium ion capacitor deteriorate, the internal resistance value of the electric double layer capacitor and the lithium ion capacitor increases, resulting in a decrease in the storage capacity. Therefore, an internal resistance value corresponding to the lowering limit of the storage capacity may be set as the threshold resistance value RTH.

Here, the case where the stop period TS for stopping the discharge by the first current I1 is provided in the period from T1 to T2 in the discharge mode has been described. On the other hand, the stop period TS may be provided in the charging mode. As shown in FIG. 3, a case where a stop period TS for stopping discharging by the second current I2 is provided in the period from T2 to T3 in the charge mode will be described. The stop period TS corresponds to the period from time T21 to time T22.

The control unit 4 detects the stop period voltage VS of the power storage unit 2 during the stop period TS. Further, the control unit 4 detects an operating voltage V21, which is the voltage of the power storage unit 2 immediately before the stop period TS, or an operating voltage V22, which is the voltage of the power storage unit 2 immediately after the stop period TS. In other words, the operating voltage V21 at T21 at which the state in which the first current I1 flows is switched to the stop period TS, or at T22 at which the state is switched from the stop period TS to the state in which the first current I1 flows again. corresponds to the operating voltage V22 of The operating voltage V21 and the operating voltage V22 are substantially the same operating voltage VD.

Then, the control unit 4 calculates the potential difference VP based on the stop period voltage VS and the operating voltage VD. Further, control unit 4 obtains second internal resistance value R2, which is the internal resistance value of power storage unit 2, by calculation based on potential difference VP and second current I2. More specifically, the control unit 4 first obtains the potential difference VP, which is the difference between the stop period voltage VS and the operating voltage V21 or the difference between the stop period voltage VS and the operating voltage V22, by calculation. Furthermore, the control unit 4 obtains a first internal resistance value R1, which is a value obtained by dividing the potential difference VP by the second current I2, by calculation. Then, the control unit 4 performs a comparison operation between the second internal resistance value R2 and the threshold resistance value RTH stored in the control unit 4 in advance. Further, when second internal resistance value R2 is equal to or greater than threshold resistance value RTH, control unit 4 determines that deterioration of power storage unit 2 is progressing. When control unit 4 determines that the deterioration of power storage unit 2 is progressing, control unit 4 sends a warning signal S2 to warning display unit 15 to warn passengers that power storage unit 2 is in a deteriorated state.

Here, the control unit 4 determines deterioration of the power storage unit 2 when the stop period TS is provided in the discharge mode, or determines deterioration of the power storage unit 2 when the stop period TS is provided in the charge mode. , or both. Further, when both the discharge mode and the charge mode are executed, if the control unit 4 obtains different determinations for each, the control unit 4 may execute both the discharge mode and the charge mode again. .

With the above configuration and operation, the on-vehicle power supply 1 can operate when it receives the vehicle activation signal S1, in other words, when the vehicle on which the on-vehicle power supply 1 is mounted is activated. Deterioration determination for the power storage unit 2 of the in-vehicle power supply device 1 can be performed in this state. For this reason, in-vehicle power supply device 1 does not need electric power corresponding to dark current for determining deterioration of power storage unit 2 when the vehicle is not started and vehicle start signal S<b>1 is not received. Therefore, the control unit 4 can perform deterioration determination for the power storage unit 2 without imposing a burden on the vehicle battery 7 . Furthermore, in a state where the power storage unit 2 stores necessary power in an emergency and in a state capable of coping with an emergency, the power storage unit 2 consumes a level of power that does not cause a problem in discharging power in an emergency. The power supply device 1 can perform deterioration determination for the power storage unit 2 . When the power storage unit 2 is degraded, the in-vehicle power supply device 1 can warn the passenger of the degraded state at any time so that the passenger can recognize the state.

Here, the period from TG0 when the passenger starts the vehicle 5 or from TG1 to T1 when the discharge mode is executed may be preset by the controller 4 . Alternatively, the time point T1 is not simply set by time, but after the controller 4 can detect the amount of travel of the vehicle 5 and the controller 4 detects that the vehicle 5 has traveled a predetermined amount of travel. , T1 may be set.

The amount of travel described above may be set based on the condition that the on-vehicle power supply device 1 and particularly the power storage unit 2 reach a normal temperature or a temperature similar to normal use when the vehicle 5 travels. This provides conditions suitable for control unit 4 to determine deterioration of power storage unit 2 . In other words, control unit 4 can perform the deterioration determination for power storage unit 2 in the discharge mode and the charge mode with high reliability.

Further, when the control unit 4 is in the discharge mode or the charge mode, the deterioration of the power storage unit 2 is preferably performed while the vehicle is stopped at an intersection or the like, in other words, while the vehicle 5 is stopped after being started. At this time, of course, the control unit 4 can detect the state in which the vehicle 5 is stopped. Here, the control unit 4 may set the time point T1 when detecting that the vehicle 5 is in a stopped state after receiving the vehicle activation signal S1 when the vehicle 5 is activated. Alternatively, after the control unit 4 receives the vehicle start signal S1 when the vehicle 5 is started, and further after the control unit 4 detects that the vehicle 5 has traveled a predetermined amount of travel, the vehicle 5 starts running. The time point of T1 may be set when detecting that it is in a stopped state.

As a result, the electric power of the power storage unit 2 is consumed at a timing when the possibility of encountering an unexpected situation such as an accident is relatively low when the vehicle 5 is stopped compared to when the vehicle 5 is running, and the on-vehicle power supply device 1 is less necessary. , the control unit 4 can determine the deterioration of the power storage unit 2 . As a matter of course, the vehicle 5 is in a state of being started, so it is possible to suppress the load on the vehicle battery 7 due to dark current consumption and the like.

When the controller 4 operates the discharge circuit 13 in the discharge mode to discharge the first current I1, the discharged power may be supplied to the vehicle load 10 . The discharge mode starts at time T1 when the vehicle 5 is already running. In this case, since the vehicle 5 is in a normal starting state, many vehicle loads 10 are started in addition to the vehicle loads 10 for ensuring the safety of the vehicle 5 and passengers when the vehicle battery 7 fails. there is Therefore, by supplying discharge power to the vehicle load 10 during startup, the occurrence of failures in the discharge circuit 13 due to excessive current flowing through the discharge circuit 13 is suppressed, and the on-vehicle power supply 1 maintains high reliability. becomes possible.

When the control unit 4 operates the discharge circuit 13 in the discharge mode to discharge the first current I<b>1 , the discharged power may be supplied to the vehicle battery 7 . Since the vehicle battery 7 has a larger capacity than the power storage unit 2 , it can be easily charged with the power discharged from the discharge circuit 13 . Here, the normal conductor path 11 may be used as a path for supplying electric power from the discharge circuit 13 to the vehicle battery 7 . Alternatively, a path for supplying electric power from the discharge circuit 13 to the vehicle battery 7 is provided inside the on-vehicle power supply device 1 with a discharge path (not shown) connecting the output portion of the discharge circuit 13 and the input terminal 8. may

The first current I1 and the second current I2 may be constant current values except for the stop period TS. The charging current IG0 may also be a constant current value. Also, the first current I1 and the second current I2 may be smaller values than the charging current IG0. Furthermore, the period from TG0 to TG1 in which the charging current IG0 flows may be shorter than the period from T1 to T2 in which the first current I1 flows and the period from T2 to T3 in which the second current I12 flows. .

The change from the first voltage V1 to the second voltage V2 and the change from the second voltage V2 to the third voltage V3 are very large compared to the change from the initial voltage V0 to the first voltage V1 from TG0 to TG1. It becomes a gentle and small rate of change. Therefore, the operating voltage V11, the operating voltage V12, the operating voltage V21, and the operating voltage V22 detected when the voltage of the power storage unit 2 becomes discontinuous or nearly discontinuous can be accurately detected by the control unit 4. As a result, the accuracy of determination regarding deterioration of power storage unit 2 is also improved.

2 and 3, the initial voltage V0 corresponding to the case where the power storage unit 2 is charged at a very low voltage before TG0, that is, before the vehicle 5 is started, has been used. In addition, setting the initial voltage V0 to a small value allows the electric circuit (not shown) provided in the power storage unit 2 and the discharge circuit 13 to discharge unnecessary power from the power storage unit 2 when the vehicle 5 is stopped. It was done by

On the other hand, before TG0, the initial voltage V0 may be set equal to the first voltage V1 and the third voltage V3, or the initial voltage V0 may be set higher than the first voltage V1 and the third voltage V3. In other words, initial voltage V0 may be set according to the characteristics of the storage element used in storage unit 2 . Also in this case, the second voltage V2 is a value that can be stepped up or stepped down by the discharge circuit 13, or a value that can operate the vehicle load 10 by being discharged through the discharge circuit 13. If it is

The control unit 4 described above is an element having functions of receiving and transmitting signals, controlling circuits, storing data, and executing calculations. The above functions do not necessarily need to be provided as a single element in the control unit 4, and the control unit 4 may be configured to include individual functions that are distributed.

INDUSTRIAL APPLICABILITY The in-vehicle power supply device of the present invention has the effect of being able to determine the deterioration of a power storage unit without consuming dark current, and is useful in various vehicles.

REFERENCE SIGNS LIST 1 vehicle-mounted power supply device 2 power storage unit 3 charging/discharging circuit 4 control unit 5 vehicle 6 vehicle body 7 vehicle battery 8 input terminal 9 output terminal 10 vehicle load 11 normal conductor path 12 charging circuit 13 discharging circuit 14 start signal transmitting unit 15 warning display unit

Claims (9)

a power storage unit;
a charging/discharging circuit capable of charging and discharging the power storage unit and capable of discharging the power of the power storage unit in an emergency;
a control unit capable of detecting the voltage of the power storage unit and the current flowing through the charging/discharging circuit, receiving a vehicle start signal, and transmitting a warning signal;
The control unit
When receiving the vehicle activation signal,
discharging the charging/discharging circuit with a first current in a discharging mode to lower the voltage of the storage unit from the first voltage to the second voltage;
further charging the charging/discharging circuit with a second current in a charging mode to increase the voltage of the power storage unit from the second voltage to a third voltage;
At least one of the charging mode and the discharging mode is provided with a stop period for stopping the discharging operation or the charging operation,
The control unit
detecting a potential difference between a stop period voltage of the power storage unit during the stop period and an operating voltage of the power storage unit immediately before or after the stop period;
obtaining a first resistance value from the potential difference and the first current when the stop period is provided in the discharge mode;
obtaining a second resistance value from the potential difference and the first current when the suspension period is provided in the charging mode;
transmitting the warning signal when the first resistance value or the second resistance value is equal to or greater than a threshold resistance value;
In-vehicle power supply. The control unit is further capable of detecting a predetermined travel distance,
After the control unit receives the vehicle activation signal and further detects the predetermined travel amount, or after a predetermined time has elapsed since receiving the vehicle activation signal,
detecting a potential difference between a stop period voltage of the power storage unit during the stop period and an operating voltage of the power storage unit immediately before or after the stop period;
obtaining a first resistance value from the potential difference and the first current when the stop period is provided in the discharge mode;
obtaining a second resistance value from the potential difference and the first current when the suspension period is provided in the charging mode;
transmitting the warning signal when the first resistance value or the second resistance value is equal to or greater than a threshold resistance value;
The vehicle-mounted power supply device according to claim 1 . The control unit is further capable of detecting a running stop state,
When the control unit detects the running stop state after receiving the vehicle activation signal,
The control unit
detecting a potential difference between a stop period voltage of the power storage unit during the stop period and an operating voltage of the power storage unit immediately before or after the stop period;
obtaining a first resistance value from the potential difference and the first current when the stop period is provided in the discharge mode;
obtaining a second resistance value from the potential difference and the first current when the suspension period is provided in the charging mode;
transmitting the warning signal when the first resistance value or the second resistance value is equal to or greater than a threshold resistance value;
The vehicle-mounted power supply device according to claim 1 . the charging/discharging circuit includes a charging circuit that charges the electric storage unit with electric power and a discharging circuit that discharges the electric power of the electric storage unit;
The control unit
Electric power output by discharging the discharging circuit with a first current in the discharging mode is returned to the charging circuit to reduce the voltage of the power storage unit from a first voltage to a second voltage.
The vehicle-mounted power supply device according to claim 1 . supplying electric power output by causing the discharge circuit to discharge at a first current in the discharge mode to a vehicle load;
The vehicle-mounted power supply device according to claim 1 . Supplying power output by discharging the discharge circuit at a first current in the discharge mode to a vehicle battery;
The vehicle-mounted power supply device according to claim 1 . When the vehicle activation signal is received, the control unit causes the charging/discharging circuit to perform a charging operation to charge the battery to the first voltage using electric power of a vehicle battery.
The vehicle-mounted power supply device according to claim 1 . the first current in the discharge mode is a constant current;
the second current in the charging mode is a constant current;
The vehicle-mounted power supply device according to claim 1 . The first voltage and the second voltage are
A value higher than the voltage corresponding to the power output from the power storage unit via the charge/discharge circuit and capable of driving a load,
The vehicle-mounted power supply device according to claim 1 .

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