JP6750313B2 - Vehicle power supply - Google Patents

Description

The present invention relates to a vehicle power supply device.

The power supply system for vehicles is generally configured to use a battery as the main power supply, but if the main power supply fails, the power supply to the load is interrupted and electrical operation (for example, various electronic controls, etc.) ) Becomes impossible. As a configuration capable of solving such a problem, a configuration in which an auxiliary power supply is mounted is known. For example, in the technique of Patent Document 1, a capacitor unit using a plurality of electric double layer capacitors is used as the auxiliary power supply. ..

JP, 2004-322987, A

When a capacitor is used as an auxiliary power source, there is a problem that deterioration of the capacitor will progress if a high charging voltage is maintained for a long time. In this regard, in the vehicle power supply device disclosed in Patent Document 1, the capacitor (power supply backup unit) is charged with electric charge at the start of vehicle operation, so that the capacitor is used as an auxiliary power supply during vehicle operation and at the end of vehicle operation. By discharging the electric charge from the capacitor, deterioration of the capacitor is suppressed.

However, there is a limit to the amount of charging current that can be supplied to the capacitor, and it takes some charging time to increase the output of the capacitor to a desired voltage (voltage that can function as a backup power supply) after starting charging. Will be required. That is, there is a delay before it functions as a backup power supply. Regarding this point, Patent Document 1 also discloses a technique of starting the charging of the capacitor when the door opening/closing switch is turned on or when the keyless signal is turned on. According to this method, the charging start time can be advanced. Therefore, it is possible to suppress the problem of delay until the backup power supply functions.

However, as in the technique disclosed in Patent Document 1, even if the charging of the capacitor is started during the ON operation of the door opening/closing switch or the ON operation of the keyless signal, the user does not always start the vehicle thereafter. It is also conceivable that the door may be closed and the keyless signal may be turned off without starting the vehicle after the charging of the capacitor is started. In this case, the capacitor may be maintained at the high charging voltage for a long time until the next vehicle operation ends (the next time the ignition switch is switched from on to off), and deterioration may progress.

The present invention has been made based on the above-mentioned circumstances, and it is possible to suppress the progress of deterioration of the vehicle power supply device that can make the charging voltage of the power storage unit earlier to the desired charging voltage after the vehicle is started. It is intended to be realized by the configuration.

The vehicle power supply device of the present invention is
A charging/discharging circuit section that performs a charging operation for charging the power storage section based on the power supplied from the power supply section and a discharging operation for discharging the power storage section;
A detection unit that detects at least a predetermined first operation different from the vehicle start operation and a predetermined second operation different from the vehicle stop operation;
When the detection unit detects the first operation before the starting operation, the detection unit outputs an instruction signal for instructing the charging/discharging circuit unit to make the output voltage of the power storage unit the first voltage. After the charging/discharging circuit unit is caused to start the operation of bringing the output voltage of the power storage unit close to the first voltage in response to the detection of the first operation, the vehicle does not start and the detection unit performs the second operation. When detecting, a control unit that outputs an instruction signal that instructs the charge and discharge circuit unit to perform an operation of setting the output voltage of the power storage unit to a second voltage that is lower than the first voltage,
Have.

In the vehicle power supply device of the present invention, when the first operation is performed before the starting operation of the vehicle, this is detected to operate the charging/discharging circuit unit to set the output voltage of the power storage unit to the relatively large first voltage. can do. That is, since the charging of the power storage unit can be started before the vehicle is started, the charging voltage of the power storage unit can be set to a desired charging voltage earlier than after the vehicle is started.

In addition, after operating the charging/discharging circuit unit in response to the detection of the first operation, if the detection unit detects the second operation without starting the vehicle, the output voltage of the power storage unit is set to a second voltage that is relatively small. Can be Therefore, after the first operation is performed, the situation in which the vehicle is maintained at the high charging voltage for a long time without being started does not easily occur, and the progress of deterioration can be effectively suppressed.

Therefore, it is possible to realize the vehicle power supply device that can make the charging voltage of the power storage unit earlier to the desired charging voltage after the vehicle is started with a configuration that can suppress the progress of deterioration.

1 is a block diagram illustrating a power supply system including a vehicle power supply device according to a first embodiment. 5 is a timing chart showing the relationship between the voltage of the power storage unit and the ignition signal in the vehicle power supply device of the first embodiment.

Here, a desirable example of the present invention will be shown.
The control unit starts the operation of bringing the output voltage of the power storage unit close to the first voltage in response to the detection of the first operation by the detection unit, and then the vehicle does not start and the detection unit performs the second operation. When the predetermined time lapse condition is satisfied without detecting the above condition, an instruction signal for instructing the charging/discharging circuit unit to set the output voltage of the power storage unit to an intermediate voltage lower than the first voltage and higher than the second voltage is output. When the vehicle is started after the operation of bringing the output voltage of the power storage unit close to the intermediate voltage is started by the charge/discharge circuit unit, the charge/discharge circuit unit is instructed to set the output voltage of the power storage unit to the first voltage. It may be configured to output an instruction signal to perform.

If a certain amount of time elapses after the detection unit detects the first operation and the vehicle does not start and the detection unit does not detect the second operation, the vehicle may start immediately. There may be other purposes such as staying in for a long time. In such a case, by operating the charging/discharging circuit unit to set the output voltage of the power storage unit to an intermediate voltage (a voltage lower than the first voltage and higher than the second voltage), the output voltage of the power storage unit after the vehicle is started. It is possible to suppress the deterioration of the power storage unit while increasing the voltage to the first voltage earlier.

The control unit causes the charging/discharging circuit unit to start the operation of bringing the output voltage of the power storage unit close to the intermediate voltage, and then, when the detection unit detects the second operation without starting the vehicle, the control unit sets the output voltage of the power storage unit to the second voltage. It may be configured to output an instruction signal for instructing the charging/discharging circuit unit to perform the operation of setting the voltage.

According to this configuration, after the operation of bringing the output voltage of the power storage unit close to the intermediate voltage is started, it is less likely that the vehicle will be maintained at the intermediate voltage for a long time without being started, and the progress of deterioration can be effectively prevented. Can be suppressed.

<Example 1>
Hereinafter, a first embodiment embodying the present invention will be described.
FIG. 1 is a block diagram illustrating a power supply system 100 including a vehicle power supply device 1 (hereinafter, also simply referred to as a power supply device 1) according to a first embodiment. A power supply system 100 shown in FIG. 1 includes a power supply unit 91 as a main power supply and a power supply device 1, and is configured as a system capable of supplying power to a load 93. The power supply system 100 normally supplies a current to the load 93 based on the electric power from the power supply unit 91, and supplies a current to the load 93 based on the electric power from the power storage unit 7 when the power supply unit 91 fails. Eggplant

The power supply unit 91 is configured as a known on-vehicle battery such as a lead battery. The high-potential-side terminal of the power supply unit 91 is connected to the wiring unit 82, and the output voltage from the power supply unit 92 is applied to the wiring unit 82. A generator (not shown) is also connected to the wiring section 82.

The load 93 is configured as a known on-vehicle electrical component, and a suitable example is an electrical component, such as an ECU or an actuator in a shift-by-wire system, for which power supply is desired even when one power source fails. The load 93 normally operates based on the power supply from the power supply unit 92, and when there is an abnormality (such as when the power supply unit 92 fails), the load 93 operates based on the power supply from the power storage unit 7.

The power supply device 1 includes a power storage unit 7, a charge/discharge circuit unit 3, a control circuit, and the like. The power supply device 1 has a function of receiving power from the power supply unit 92 to charge the power storage unit 7, and a function of energizing the load 93 based on the power from the power supply unit 92 or the power storage unit 7.

Power supply device 1 has first conductive path 21 connected to wiring portion 81, second conductive path 22 connected to wiring portion 82, and third conductive path 23 connected to power storage unit 7. The first conductive path 21 is electrically connected to the power supply unit 91 via the wiring unit 81, and has a configuration to which the output voltage from the power supply unit 91 is applied. The second conductive path 22 is electrically connected to the load 93 via the wiring portion 82.

Power storage unit 7 is configured by a known power storage unit such as an electric double layer capacitor. The power storage unit 7 is electrically connected to the charge/discharge circuit unit 3 and can be charged/discharged by the charge/discharge circuit unit 3. For example, the output voltage of the power storage unit 7 when fully charged is lower than the output voltage of the power supply unit 91 when fully charged.

The charging/discharging circuit unit 3 includes a charging circuit 3A and a discharging circuit 3B, and performs a charging operation of charging the power storage unit 7 based on the power supplied from the power supply unit 91 and a discharging operation of discharging the power storage unit 7. You can do it.

The charging circuit 3A is configured as a known charging circuit such as a DCDC converter, performs a charging operation based on power supply from the power supply unit 91, and supplies a charging current to the power storage unit 7 via the third conductive path 23. .. The charging circuit 3A has a configuration capable of receiving a charging signal and a stop signal from the control circuit 5, and when the charging signal is given from the control circuit 5 (when a charging instruction is given), the charging circuit 3A is connected to the third conductive path 23. A charging operation for applying a predetermined voltage is performed on the other hand, and when the charge stop signal is given from the control circuit 5 (when a charge stop instruction is issued), the output to the third conductive path 23 is stopped.

The discharge circuit 3B is configured to switch between the output electric path (third conductive path 23) from the charging circuit 3A and the second conductive path 22 into a conductive state or a non-conductive state. The discharge circuit 3B is composed of, for example, a switch element (MOSFET or the like) interposed between the third conductive path 23 and the second conductive path 22. In the discharge circuit 3B, when the discharge permission signal is given from the control circuit 5 (when the discharge instruction is issued), the switch element is turned on to cause the third conductive path 23 and the second conductive path 22 to operate. The two are electrically connected to each other, and the load 93 is discharged from the power supply (power supply unit 91 and power storage unit 7). Further, in the discharge circuit 3B, when the discharge stop signal is given from the control circuit 5 (when the discharge stop instruction is issued), the switch element is turned off to cause the third conductive path 23 and the second conductive path. The electrical connection with 22 is cut off, and the discharge from the power supply (power supply unit 91 and power storage unit 7) to the load 93 is stopped.

The voltage detection circuit 11 (voltage monitor) is configured as a known voltage detection circuit, and inputs a value indicating the voltage of the first conductive path 21 to the control circuit 5 as an analog voltage signal. The voltage detection circuit 9 (voltage monitor) is configured as a known voltage detection circuit, and inputs a value indicating the voltage of the third conductive path 23 to the control circuit 5 as an analog voltage signal. The control circuit 5 grasps the voltage value of the first conductive path 21 based on the analog voltage signal input from the voltage detection circuit 11, and the third conductive path 23 based on the analog voltage signal input from the voltage detection circuit 9. Understand the voltage value of.

The control circuit 5 is configured as a microcomputer, for example, and has an arithmetic unit such as a CPU, a memory such as a ROM or a RAM, an AD converter, and the like. The control circuit 5 can grasp the voltage value of the first conductive path 21 and the voltage value of the third conductive path 23. Further, the control circuit 5 has a function of controlling the charging operation and the discharging operation by the charging/discharging circuit unit 3, and specifically, a function of giving a charging signal or a charging stop signal to the charging circuit 3A and a discharging circuit. It has a function of giving a discharge signal or a discharge stop signal to 3B.

The control circuit 5 can receive an ignition on signal (hereinafter, also referred to as an IG on signal) or an ignition off signal (hereinafter, also referred to as an IG off signal) via the first input path 41. Specifically, when an ignition switch (not shown) provided in a vehicle equipped with the power supply device 1 is turned on, an IG ON signal is input to the control circuit 5 via the first input path 41, and the ignition switch is turned on. When is turned off, the IG off signal is input to the control circuit 5 via the first input path 41.

The control circuit 5 may receive a door open signal or a door close signal via the second input path 42. Specifically, when one of the doors provided in the vehicle equipped with the power supply device 1 is opened, a door open signal is input to the control circuit 5 via the second input path 42, and all the doors of the vehicle are opened. When is closed, a door close signal is input to the control circuit 5 via the second input path 42.

The control circuit 5 may receive the keyless on signal or the keyless off signal via the third input path 43. Specifically, in a vehicle equipped with the power supply device 1, a keyless entry system capable of performing wireless communication between a portable device (key) and an in-vehicle device is configured, and the in-vehicle device wirelessly communicates with the portable device (key). ) Is detected, a keyless ON signal is input to the control circuit 5 via the third input path 43, and when the vehicle-mounted device does not detect the portable device (key), the third input path 43 A keyless off signal is input to the control circuit 5 via the control circuit 5.

The control circuit 5 may receive a door lock signal or a door unlock signal via the fourth input path 44. Specifically, when all the doors of the vehicle equipped with the power supply device 1 are locked, a door lock signal is input to the control circuit 5 via the fourth input path 44, and any one of the doors of the vehicle is locked. If not, the door unlock signal is input to the control circuit 5 via the fourth input path 44.

Each signal provided to the control circuit 5 via the first input path 41, the second input path 42, the third input path 43, and the fourth input path 44 may be provided from an external ECU. Alternatively, it may be given directly from a sensor or a detection circuit provided in a door or the like. The configuration for generating each signal is well known in an in-vehicle system, and thus its details are omitted.

Next, the operation of the power supply device 1 will be described.
In the power supply device 1 shown in FIG. 1, the control circuit 5 performs the first control on the charging/discharging circuit unit 3 when the predetermined start condition is satisfied, and the control circuit 5 is performed when the predetermined end condition is satisfied. Second control is performed on the charge/discharge circuit unit 3.

The predetermined start condition is, for example, one of "switching the ignition switch to the ON state", "door opening operation", and "portable device (key) detection". Specifically, the control circuit 5 sets the charging target voltage of the power storage unit 7 to the first voltage VH when detecting the input of any of the IG on signal, the door open signal, and the keyless on signal, and the power storage unit The charging circuit 3A is operated so that the output voltage of 7 becomes the first voltage VH.

In this example, the input of any one of the IG ON signal, the door open signal, and the keyless ON signal to the control circuit 5 is “establishment of a predetermined start condition”, and the output voltage of the power storage unit 7 is the first voltage VH. The control for operating the charging/discharging circuit unit 3 so that the above is “first control”. In this configuration, even if the ignition switch is in the off state, if either the door open signal or the keyless on signal is detected by the control circuit 5, the charging operation is performed so as to increase the output voltage of the power storage unit 7. Become.

Further, the predetermined termination condition is, for example, one of "switching the ignition switch from ON state to OFF state", "door lock when the ignition switch is in OFF state", and "non-detection of portable device (key)". is there. Specifically, the control circuit 5 controls the "when the signal input via the first input path 41 is switched from the IG on signal to the IG off signal" "when the IG off signal is input. When a signal is input” and “when a keyless off signal is input”, the charging target voltage is set to the second voltage VL, and the charge/discharge circuit unit is set so that the output voltage of the power storage unit 7 becomes the second voltage VL. 3 is operated.

In this example, "the signal input via the first input path 41 has been switched from the IG on signal to the IG off signal" "the door lock signal being input while the IG off signal is being input" “The input of the keyless off signal” is “establishment of a predetermined termination condition”, and control for operating the charge/discharge circuit unit 3 so that the output voltage of the power storage unit 7 becomes the second voltage VL is “first. 2 control”. In this configuration, even if the charging operation before the ON operation of the ignition switch (the operation of increasing the charging voltage of the power storage unit 7 by detecting the door open signal or the keyless ON signal when the ignition switch is in the OFF state) is performed. When the door lock signal is input while the IG off signal is input, or when the keyless off signal is input, the operation of suppressing the output voltage of the power storage unit 7 is performed.

In this configuration, the control circuit 5 corresponds to an example of a detection unit, and has a function of detecting at least a predetermined first operation different from the vehicle start operation and a predetermined second operation different from the vehicle stop operation. .. In the present configuration, the “vehicle starting operation” is an operation of switching the ignition switch from the off state to the on state. The "predetermined first operation different from the vehicle start operation" means an operation of opening the door of the vehicle (operation of generating a door open signal) and an operation of causing the vehicle-mounted device to detect the portable device (key) (keyless). Operation for generating an ON signal). The "vehicle stop operation" is an operation of switching the ignition switch from the on state to the off state. The "predetermined second operation different from the vehicle stop operation" means an operation of locking the door when the ignition switch is in an off state (an operation of generating a door lock signal when the IG off signal is input) and This is an operation (an operation for generating a keyless off signal) in which the in-vehicle device does not detect the portable device (key).

In the present configuration, the control circuit 5 corresponds to an example of both the control unit and the detection unit, and when the first operation is detected before the start operation, the operation of setting the output voltage of the power storage unit 7 to the first voltage VH is satisfied. The vehicle is started after outputting an instruction signal for instructing the discharge circuit unit 3 to cause the charge/discharge circuit unit 3 to start an operation of bringing the output voltage of the power storage unit 7 closer to the first voltage VH in response to the detection of the first operation. If the second operation is detected without performing the operation, the charging/discharging circuit unit 3 functions to output an instruction signal for instructing the charging/discharging circuit unit 3 to set the output voltage of the power storage unit 7 to the second voltage VL smaller than the first voltage VH. .. The “instruction signal for instructing the charging/discharging circuit unit 3 to set the output voltage of the power storage unit 7 to the first voltage VH” given to the charging/discharging circuit unit 3 by the control circuit 5 is the signal. Any control signal may be used as long as unit 3 operates so that the output voltage of power storage unit 7 becomes first voltage VH. Similarly, the "instruction signal for instructing the charging/discharging circuit unit 3 to set the output voltage of the power storage unit 7 to the second voltage VL" given to the charging/discharging circuit unit 3 by the control circuit 5 is charged/discharged by the signal. Any control signal may be used as long as the circuit unit 3 operates so that the output voltage of the power storage unit 7 becomes the second voltage VL. Note that various known methods can be adopted as a method of controlling the charging circuit by the control circuit and setting the power storage unit to a desired voltage.

When the control circuit 5 detects that either the door open signal or the keyless on signal is input to the control circuit 5 while the IG off signal is input (that is, when the above-described first operation is detected). ), an operation of outputting an instruction signal for instructing the charge/discharge circuit unit 3 to set the output voltage of the power storage unit 7 to the first voltage VH to bring the output voltage of the power storage unit 7 closer to the first voltage VH. However, if the IG ON signal is not input to the control circuit 5 even after a certain period of time has elapsed from the start of the operation (that is, the detection time of the door open signal or the keyless ON signal), the output of the power storage unit 7 is performed. An instruction signal for instructing the charging/discharging circuit unit 3 to perform an operation of bringing the voltage closer to the intermediate voltage VM is output. In this example, “a predetermined period of time has elapsed since the control circuit 5 detected the first operation” is “establishment of a predetermined time elapse condition”. The “instruction signal for instructing the charging/discharging circuit unit 3 to set the output voltage of the power storage unit 7 to the intermediate voltage VM” given to the charging/discharging circuit unit 3 by the control circuit 5 causes the charging/discharging circuit unit 3 to output the signal. Any control signal that operates to set the output voltage of power storage unit 7 to intermediate voltage VM may be used.

Thus, control circuit 5 outputs the output voltage of power storage unit 7 to intermediate voltage VM by the output of the instruction signal (the instruction signal that instructs charge/discharge circuit unit 3 to set the output voltage of power storage unit 7 to intermediate voltage VM). After the charging/discharging circuit unit 3 starts the approaching operation, and when the vehicle starts (that is, when the IG ON signal is input to the control circuit 5), the operation of setting the output voltage of the power storage unit 7 to the first voltage VH Is output to the charging/discharging circuit unit 3 to cause the charging/discharging circuit unit 3 to perform the operation of setting the output voltage of the power storage unit 7 to the first voltage VH. Further, when the control circuit 5 starts the operation of bringing the output voltage of the power storage unit 7 close to the intermediate voltage VM to the charge/discharge circuit unit 3, and then detects the second operation without starting the vehicle (that is, the IG off signal). When the door lock signal is input while the key is being input, or the keyless off signal is input when the IG off signal is being input), the operation of setting the output voltage of the power storage unit 7 to the second voltage VL is charged and discharged. The charge/discharge circuit unit 3 is caused to perform an operation of outputting an instruction signal for instructing the circuit unit 3 to set the output voltage of the power storage unit 7 to the second voltage VL.

Next, an example of the operation will be described with reference to FIG.
In the example of FIG. 2, in the time period before the time T1, for example, the signals of the first input path 41, the second input path 42, and the third input path 43 are changed after the ignition signal is switched to the off state. Is maintained without change, and the output voltage of power storage unit 7 is maintained at second voltage VL during this time period. Thereafter, at time T1, the ignition signal switches from the off state to the on state, and control circuit 5 detects this switching and raises the voltage of power storage unit 7 to first voltage VH. The time period from time T1 to time T2 is a time period during which the vehicle engine is operating. In the example of FIG. 2, since the ignition signal is switched to the off state at time T2, control circuit 5 detects this switching and lowers the voltage of power storage unit 7 to second voltage VL.

In the example of FIG. 2, after the time T2, the user gets out of the vehicle, locks the door, and is away from the vehicle. When the user leaves the vehicle in this way, the control circuit 5 enters a state in which the door close signal, the keyless off signal, and the door lock signal are input. After that, since the user approaches the vehicle, the portable device (key) carried by the user is detected by the in-vehicle device, and the keyless ON signal output from the in-vehicle device is input to the control circuit 5 at time T3. The control circuit 5 performs the above-described first control according to the detection of the keyless ON signal, sets the target charging voltage to the first voltage VH, and raises the output voltage of the power storage unit 7 to the first voltage VH. .. However, after the time T3, the fixed time has elapsed without inputting the ignition-on signal, so the control circuit 5 switches the target charging voltage to the intermediate voltage VM at the time (time T4) when the fixed time has elapsed, and the power storage unit 7 Output voltage is reduced to the intermediate voltage VM. Since the ignition on signal is input at time T5 after time T4, the control circuit 5 performs the above-described first control in response to the detection of the ignition on signal, and sets the output voltage of the power storage unit 7 to the first voltage VH. Is rising. After that, since the ignition signal is switched to the off state at time T6, control circuit 5 detects this switching and lowers the voltage of power storage unit 7 to second voltage VL.

After the time T6, the user got out of the vehicle, locked the door, and left the vehicle. Therefore, after the user left the vehicle, the door close signal, the keyless off signal, and the door lock signal were input to the control circuit 5. It is in a state of being After that, since the user approaches the vehicle again, the portable device (key) carried by the user is detected by the vehicle-mounted device, and at time T7, the keyless ON signal output from the vehicle-mounted device is input to the control circuit 5. The control circuit 5 performs the above-described first control according to the detection of the keyless ON signal, sets the target charging voltage to the first voltage VH, and raises the output voltage of the power storage unit 7 to the first voltage VH. .. However, after the time T7, the user got out of the vehicle and locked the door without turning on the ignition switch, so at time T8, the door lock signal is input to the control circuit 5, and the control circuit 5 causes this door lock. The above-described second control is performed according to the detection of the signal, the target charging voltage is set to the second voltage VL, and the output voltage of the power storage unit 7 is reduced to the second voltage VL.

As described above, when the first operation is performed before the vehicle start operation, the vehicle power supply device 1 of the present configuration detects the first operation and operates the charging/discharging circuit unit 3 to operate the output voltage of the power storage unit 7. The relatively large first voltage VH can be set. That is, charging of power storage unit 7 can be started before the vehicle is started, and thus the charging voltage of power storage unit 7 can be set to a desired charging voltage earlier than after the vehicle is started. In addition, after operating the charging/discharging circuit unit 3 in response to the detection of the first operation, if the detection unit detects the second operation without starting the vehicle, the output voltage of the power storage unit 7 is set to a relatively small value. Two voltages VL can be set. Therefore, after the first operation is performed, the situation in which the vehicle is maintained at the high charging voltage for a long time without being started does not easily occur, and the progress of deterioration can be effectively suppressed. Therefore, the vehicle power supply device 1 that can set the charging voltage of the power storage unit 7 to a desired charging voltage at an earlier stage after the vehicle is started can be realized with a configuration that can suppress the progress of deterioration.

Further, in the power supply device 1 having this configuration, the control circuit 5 functioning as a control unit performs an operation of bringing the output voltage of the power storage unit 7 closer to the first voltage VH in response to the detection of the first operation by the detection unit. When the vehicle does not start and the detection unit does not detect the second operation and the predetermined time lapse condition is satisfied after the start to 3, the output voltage of the power storage unit 7 is smaller than the first voltage VH and is smaller than the second voltage VH. After outputting an instruction signal for instructing the charging/discharging circuit unit 3 to make the intermediate voltage VM higher than VL and causing the charging/discharging circuit unit 3 to start the operation of bringing the output voltage of the power storage unit 7 closer to the intermediate voltage VM, When the vehicle starts, it outputs an instruction signal for instructing charge/discharge circuit section 3 to set the output voltage of power storage unit 7 to first voltage VH. If a certain amount of time elapses after the detection unit detects the first operation and the vehicle does not start and the detection unit does not detect the second operation, the vehicle may start immediately. There may be other purposes such as staying in for a long time. In such a case, the charge/discharge circuit unit 3 is operated to set the output voltage of the power storage unit 7 to the intermediate voltage VM (a voltage smaller than the first voltage VH and larger than the second voltage VL), so that after the vehicle is started. It is possible to suppress the deterioration of power storage unit 7 while allowing the output voltage of power storage unit 7 to be increased to first voltage VH earlier.

Further, in the power supply device 1 of this configuration, the control circuit 5 functioning as a control unit causes the charge/discharge circuit unit 3 to start the operation of bringing the output voltage of the power storage unit 7 close to the intermediate voltage VM, and then the vehicle does not start. When the detection unit detects the second operation, it outputs an instruction signal for instructing the charging/discharging circuit unit 3 to make the output voltage of the power storage unit 7 the second voltage VL. According to this configuration, after the operation of bringing the output voltage of power storage unit 7 close to intermediate voltage VM is started, it is less likely that the vehicle will be maintained at intermediate voltage VM for a long time without being started, and the deterioration will progress. Can be effectively suppressed.

<Other Examples>
The present invention is not limited to the embodiments described by the above description and the drawings, and the following embodiments are also included in the technical scope of the present invention.
(1) In the first embodiment, as an example of the power storage unit 7, the power storage unit 7 configured as an electric double layer capacitor is illustrated, but the power storage unit 7 may be another power storage unit such as a lithium ion battery or a lithium ion capacitor. It may be a means.
(2) Although the DCDC converter is illustrated as an example of the charging circuit 3A, the DCDC converter may be configured as a step-up type, a step-down type, a step-up/down type, or the like. Further, a known charging circuit other than the DCDC converter may be used.
(3) In the first embodiment, the example in which the control circuit 5 is configured as a microcomputer has been shown, but the control circuit 5 may be configured by a hardware circuit other than the microcomputer.
(4) In the first embodiment, an example of the first operation is shown, but the first operation may be an operation of opening the door mirror or an operation of turning on a light. The second operation may be an operation of closing the door mirror.
(5) In the first embodiment, the operation of turning on the ignition switch is illustrated as an example of the vehicle starting operation. However, when the vehicle is configured as an electric vehicle, the EV system starting operation is applicable. Although the operation of turning off the ignition switch has been illustrated as an example of the vehicle stop operation, when the vehicle is configured as an electric vehicle, the EV system stop operation is applicable.
(6) In the first embodiment, as an example of "establishment of a predetermined time lapse condition", "a predetermined time has elapsed from the detection of the first operation" is exemplified, but, for example, "after the detection of the first operation, It is also possible to confirm that non-detection of two operations has been performed a plurality of times."
(7) In any of the examples, when a predetermined abnormality occurs in the power supply unit 91 or a path electrically connected to the power supply unit 91, the power supply from the power supply unit 91 is stopped and the power storage unit 7 loads the load. Control can be performed to supply the discharge current to 93. For example, when the voltage value detected by the voltage detection circuit 11 is equal to or lower than a predetermined voltage threshold (for example, a voltage threshold indicating the occurrence of a ground fault), the operation of the charging circuit 3A is stopped and the first conductive path 21 and the first conductive path 21. It is possible to cut off the conduction between the three conductive paths 23 and maintain the conduction state of the discharge circuit 3B to supply power from the power storage unit 7 to the load 93. The “predetermined abnormality” is not limited to the case where the voltage value detected by the voltage detection circuit 11 is equal to or lower than a predetermined voltage threshold (a voltage threshold indicating the occurrence of a ground fault). It may be an abnormal state in which overcurrent or overvoltage occurs.

DESCRIPTION OF SYMBOLS 1... Vehicle power supply device 3... Charge/discharge circuit unit 5... Control circuit (control unit, detection unit)
7... power storage unit 91... power supply unit

Claims (2)

A charging/discharging circuit section that performs a charging operation for charging the power storage section based on the power supplied from the power supply section and a discharging operation for discharging the power storage section;
A detection unit that detects at least a predetermined first operation different from the vehicle start operation and a predetermined second operation different from the vehicle stop operation;
When the detection unit detects the first operation before the starting operation, the detection unit outputs an instruction signal for instructing the charging/discharging circuit unit to make the output voltage of the power storage unit the first voltage. After the charging/discharging circuit unit is caused to start the operation of bringing the output voltage of the power storage unit close to the first voltage in response to the detection of the first operation, the vehicle does not start and the detection unit performs the second operation. When detecting, a control unit that outputs an instruction signal that instructs the charge and discharge circuit unit to perform an operation of setting the output voltage of the power storage unit to a second voltage that is lower than the first voltage,
Have a,
The control unit is
After causing the charge/discharge circuit unit to start an operation of bringing the output voltage of the power storage unit close to the first voltage in response to the detection of the first operation by the detection unit, the vehicle does not start and the detection unit is When the predetermined time lapse condition is satisfied without detecting the second operation, the charging/discharging circuit unit is operated to set the output voltage of the power storage unit to an intermediate voltage that is lower than the first voltage and higher than the second voltage. Output an instruction signal to instruct,
When the vehicle is started after the operation of bringing the output voltage of the power storage unit close to the intermediate voltage is started by the charge/discharge circuit unit, the operation of setting the output voltage of the power storage unit to the first voltage is performed. A vehicle power supply device that outputs an instruction signal for instructing a discharge circuit unit . When the control unit causes the charging/discharging circuit unit to start an operation of causing the output voltage of the power storage unit to approach the intermediate voltage, and the detection unit detects the second operation without starting the vehicle, the power storage unit stores the power storage unit. The vehicle power supply device according to claim 1 , which outputs an instruction signal for instructing the charge/discharge circuit section to perform an operation of setting an output voltage of the section to the second voltage .

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