JP2009142089A - Vehicle power supply - Google Patents

Abstract

The present invention is capable of reliably boosting a battery power supply without being affected by an increase in ground potential due to an inrush current or the like, and reliably supplying power to an electric load when the engine is restarted from a stop. An object of the present invention is to provide a vehicular power supply device that can be used.
A battery 10 for supplying electric power to a starter 80 of the engine when restarting the stopped engine 70;
A step-up converter 30 that boosts the voltage of the battery and supplies electric power to the first electric load 45 when the starter operates;
An operation delay control means 60 for performing an operation delay control for delaying the operation of the second electric load 25 through which an inrush current flows when the power switch 26 is turned on when connected to the battery;
The operation delay control means executes the operation delay control when the boost converter is in operation.
[Selection] Figure 1

Description

  The present invention relates to a vehicle power supply device, and more particularly to a vehicle power supply device having a boost converter.

Conventionally, in a vehicle power supply apparatus such as an idle stop vehicle having a configuration in which a battery is used as a power source and a battery voltage is boosted by a step-up converter that operates intermittently, a power supply line for supplying a power supply voltage of an electric load When the boost converter is not operating, the output voltage of the battery is supplied, and when the boost converter is operating, a voltage boosted according to the target voltage is supplied. A technique that operates intermittently and suppresses output voltage fluctuations before and after the operation of the boost converter is known (see, for example, Patent Document 1).
JP 2005-237149 A

  However, in the configuration described in Patent Document 1 described above, for example, during operation of the boost converter, a state in which an electric load having a large inrush current such as a headlamp is suddenly turned on by the user is not assumed. In such a case, a floating (increase) in the ground potential occurs due to the influence of the inrush current, the instruction voltage from the ECU to the boost converter is erroneously recognized on the boost converter side, and the necessary boost is not executed. There was a problem that there was a case.

  Therefore, the present invention is able to reliably boost the battery power without being affected by an increase in ground potential due to an inrush current or the like, and reliably supply power to an electric load when restarting from when the engine is stopped. An object of the present invention is to provide a vehicular power supply device.

In order to achieve the above object, a vehicle power supply device according to a first aspect of the present invention includes a battery that supplies power to a starter of the engine when the stopped engine is restarted;
A boost converter that boosts the voltage of the battery and supplies power to the first electrical load when the starter is activated;
An operation delay control means for performing an operation delay control for delaying the operation of the second electric load through which an inrush current flows when the power switch is turned on when connected to the battery;
The operation delay control means executes the operation delay control when the boost converter is in operation.

  As a result, the timing for operating the electric load with a large inrush current can be shifted from the boosting operation of the boost converter, and the necessary boosting can be reliably performed and power can be supplied to the electrical load.

According to a second aspect of the present invention, in the vehicle power supply device according to the first aspect,
The operation delay control means executes the operation delay control when the starter is operating.

  As a result, even when the electric load with a large inrush current is turned on during the starter operation when the battery voltage temporarily drops, the operation timing can be shifted during the boost operation to ensure the necessary boost. it can.

According to a third aspect of the present invention, there is provided the vehicle power supply device according to the first or second aspect of the invention.
Further comprising boost control means for operating the boost converter by sending a boost command signal to the boost converter;
The operation delay control means executes the operation delay control based on a state notification signal from the boost control means.

  Thereby, the operation delay control can be executed based on the signal from the boost control means that controls the boost, and the operation timing of the boost operation and the electric load having a large inrush current can be shifted more reliably.

4th invention is the vehicle power supply device which concerns on any one invention of 1-3,
The first electric load includes storage means, and includes an electric load that resets the storage contents of the storage means when the voltage of the supplied power becomes a predetermined value or less.

  Thereby, it is possible to reliably supply power to the electric load whose stored contents are reset.

5th invention is the vehicle power supply device which concerns on any one invention of 1-4,
The second electric load includes a headlamp.

  Thereby, the countermeasure against the inrush current can be surely performed for the headlamp which is a load having a large inrush current.

6th invention is the vehicle power supply device which concerns on any one invention of 1-5,
It is mounted on an idling stop vehicle that stops an engine when a preset engine stop condition is satisfied and operates the starter when a preset engine restart condition is satisfied.

  Thereby, it can be set as the vehicle power supply device optimal for an idling stop vehicle.

  According to the present invention, when the vehicle engine is restarted after being stopped, the power supply can be reliably boosted, and the resetting of the electric device due to insufficient voltage can be eliminated.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 is a functional block diagram showing the main configuration of a vehicle power supply device according to an embodiment to which the present invention is applied. In FIG. 1, the vehicle power supply apparatus according to the present embodiment includes a battery 10, a boost converter (BBC, Back-up Boost Converter) 30, and an operation delay control means 60. Moreover, you may provide the pressure | voltage rise control means 50 as needed. The operation delay control means 60 may be configured, for example, as a part of a body ECU (Electronic Control Unit) 65. Similarly, the boost control means 50 may be configured as a part of the control ECU 55. .

  Further, in FIG. 1, as related components of the vehicle power supply device according to the present embodiment, a first electric load having a storage means 46 such as an audio device, a navigation device, a starter 80 for starting the engine, and a headlamp A second electric load 25 that generates an inrush current when the power is turned on, etc., and a power switch 26 for turning on the second electric load 25 by the user turning on the power may be provided.

  In FIG. 1, the starter 80 and the second electric load 25 are connected to the battery 10 by the power supply line 20. The first electrical load 45 is connected to the boost converter 30 by the boost power supply line 40, and the boost converter 30 is connected to the battery 10 by the power supply line 20.

  Hereinafter, although each component is demonstrated, the vehicle power supply device which concerns on a present Example is suitably applicable to the idling stop vehicle carrying an idling step system. The idling stop vehicle has a function of automatically stopping the engine when a predetermined engine stop condition for stopping the engine is satisfied when the vehicle is stopped due to a signal waiting or the like. Conversely, after the engine is stopped, when a predetermined engine restart condition for restarting the engine is satisfied, the starter 80 is activated and the engine is automatically restarted. Hereinafter, the example which applied the power supply device for vehicles concerning a present example to such an idling stop vehicle is explained.

  The battery 10 is a power source for supplying power to the on-vehicle electric load. The battery 10 may be a vehicle battery, for example, a secondary battery such as a lead battery.

  The power supply line 20 is a power supply line for supplying power output from the battery 10. The power supplied from the power supply line 20 is supplied directly from the battery 10.

  The starter 80 is means for starting an engine (not shown), and includes an electric motor. As described above, in an idling stop vehicle, the engine is stopped when the vehicle satisfies a predetermined engine stop condition by waiting for a signal or the like. Therefore, when restarting, it is necessary to restart the engine. Since the engine needs to be restarted quickly and preferentially, the power supply to the starter 80 that restarts the engine is directly performed from the battery 10 via the power line 20.

  Boost converter 30 is voltage compensation means for boosting the voltage and supplying power when the output voltage from battery 10 drops. For example, for an electrical load that may adversely affect operation if the supply voltage drops even for a moment, the boost converter 30 is used so that the voltage is always supplied at a voltage equal to or higher than a predetermined value. . Therefore, boost converter 30 operates when the voltage value of power supply line 20 is equal to or lower than a predetermined value, and supplies boosted power from boosted power supply line 40. As described above, when the engine is temporarily stopped due to idling stop and restarted, power is supplied from the battery 10 to the starter 80. At this time, a large current flows and the battery 10 is subjected to a large burden. The output voltage of the battery 10 will drop for a moment. At this time, for an electrical load that causes a problem if power is not supplied at a predetermined voltage or higher, a boost converter 30 is connected to compensate the voltage.

  The first electrical load 45 includes a storage unit 46 such as an audio device or a navigation device, and includes an electrical load that may reset the content of the storage unit 46 when the voltage drops below a predetermined value. It's an electrical load. In such an electric load, when the supplied voltage drops below a predetermined value, the content stored in the storage means 46 is reset. Therefore, when the engine is stopped at the idling stop and restarted. It is necessary to prevent reset. In the vehicle power supply device according to the present embodiment, the reset is prevented by supplying the boosted power from the boost converter 30 via the boost power supply line 40.

  The boost control unit 50 is a control unit that issues a boost command to the boost converter 30. For example, the output voltage of the power supply line 20 of the battery 10 is detected, and when the output voltage falls below a predetermined value, a boost command signal is output to the boost converter 30 so as to perform a boost operation, and the operation of the boost converter 30 is controlled. . Further, the boost control means 50 may not only give a boost command to the boost converter 30 but also control the stop of boost.

  The boost control unit 50 may be configured as a part of the control ECU 55. Since the boost control means 50 performs arithmetic processing for control, it is configured as arithmetic processing means such as an MPU (Micro Processing Unit), a predetermined electronic circuit, or an ASIC (Application Specific Integrated Circuit). The control ECU 55 may perform control such as engine restart, and the boost control means 50 may be incorporated as part of these controls.

  The second electrical load 25 is an electrical load that generates a large inrush current when the power switch is turned on and the power is turned on. For example, the headlamp is included in the second electric load 25 because the resistance is small because the filament is still cold immediately after the power is turned on, and the current flows more than in the steady state. The second electric load 25 may include various on-vehicle electric loads that generate a large inrush current, such as a winding device using an electric motor or a transformer, a device having a large-capacity smoothing capacitor, and the like.

  The second electric load 25 such as a headlamp has a power switch 26, and the power switch 26 is turned on and off by a user operation. Therefore, the second electric load 25 such as a headlamp is turned on by the user at an arbitrary timing regardless of the state of the vehicle. Therefore, if the power switch of the second electrical load is turned on while the boost converter 30 is boosting or the starter 80 is operating, a large inrush current flows through the second electrical load 25. Therefore, ground floating occurs, which affects the boosting operation of the boost converter 30. In the vehicle power supply device according to the present embodiment, when the second electric load is turned on at such timing, control is performed that does not affect the operation of the boost converter 30. This will be described later. To do.

  The second electrical load 25 may be directly connected to the battery 10. Unlike the first electric load 45, if the storage means 45 or the like is not provided, it is not particularly necessary to supply power to the boost converter 30, so that it is directly connected to the battery 10 like other normal electric loads. It's okay.

  The operation delay control unit 60 is a control unit that delays the operation timing of the second electric load 26 even when the power switch of the second electric load 25 is turned on by the user and turned on. As described above, when the second electric load 25 including the headlamp and the like is turned on while the boosting converter 30 is boosting, since a large inrush current flows, the ground potential rises due to ground floating. The boost command signal cannot be recognized correctly, and the boost operation is adversely affected. The operation delay control means 60 delays the operation when the second electric load 25 is turned on while the boost converter 30 is boosting the voltage, and the second delay until the boost operation of the boost converter 30 is completed. This is a means for preventing the electric load 25 from being operated.

  FIG. 2 is a diagram showing experimental data when the headlamp which is the second electric load 25 is turned on during the operation of the boost converter 30. In FIG. 2, the lowermost characteristic indicates the current flowing through the load when the headlamp is turned on. The uppermost characteristic indicates the voltage of the boost command signal transmitted from the boost control means 50 to the boost converter 30. The characteristics of the middle stage indicate the input voltage (voltage of the power supply line 20) and the output voltage (voltage of the boost power supply line 40) of the boost converter 30.

  As shown on the left side of FIG. 2, at time t0 to t1, when the headlamp is off, the boost command signal and the boost converter output voltage also have a constant value.

  In FIG. 2, as indicated by the lower characteristic, when the headlamp as the second electric load 25 is turned on at time t1, an inrush current of 50 [A / div] flows, and a large inrush current is generated when the power is turned on. Can be seen.

  Next, as shown by the characteristics of the uppermost stage in FIG. 2, when the headlamp is turned on, floating of the ground potential of the boost converter 30 occurs at time t1 to t3 and is sent from the boost control means 50 to the boost converter 30. Waveform fluctuation occurs in the boost command signal. That is, the voltage level of the boost command signal is lowered.

  As a result, as shown in the middle part of FIG. 2, since the voltage level of the boost command signal is low at times t1 to t2, although the input voltage (lower characteristic curve) of the boost converter is low, the boost command is The boost converter 30 mistakenly recognizes that there is nothing and stops boosting. Therefore, as shown in the middle stage of FIG. 2, after time t2, the boosting converter 30 stops boosting at the time of about 100 [ms] (time t2) even though the input voltage of the boosting converter 30 is low. The output voltage (upper characteristic curve) is stopped in a low state.

  Thus, when the second electric load 25 having a large inrush current such as a headlamp is turned on while the boost converter 30 is operating ((1) in FIG. 2), the boost converter is caused by the large current. As a result, the ground potential rises and the boost command signal cannot be correctly recognized ((2) in FIG. 2). As a result, the boost converter 30 stops boosting ((3) in FIG. 2), the boosting required when boosting is not performed, and the first electric load 45 such as navigation is reset. There is a fear.

  Therefore, in the vehicle power supply device according to the present embodiment, as described in FIG. 1, the work delay control means 60 is provided, and the power supply of the second electric load 25 is turned on during the boosting operation of the boost converter 30. In such a case, control for delaying the operation of the second electric load is performed.

  Returning to FIG. In FIG. 1, the operation delay control means 60 increases the voltage when the power switch 26 of the second electric load is turned on by the user while the boost converter 30 is operating so that the phenomenon described in FIG. 2 does not occur. Until the boosting operation of the converter 30 is completed, the operation delay control is executed so that the second electric load 25 does not operate. Therefore, the operation delay control means 60 monitors whether the boost converter 30 is operating. Whether the boost converter 30 is operating or not may be detected directly from the operation signal of the boost converter 30 or may receive a state notification signal from the boost control means 50. For example, when the operation delay control unit 60 detects that the boost converter 30 is operating, the power supply to the second electric load 25 is not performed while a signal indicating that the boost converter is operating is being output. In addition, control may be performed so as to turn off the switching means.

  On the other hand, the operation control delay control means 60 may be configured such that the user monitors on / off of the power switch 26 of the second electric load 25. The operation delay control means 60 may be a simple logic for forcibly executing the operation delay control of the second electric load 25 when the boost converter 30 is in operation. By also monitoring 26, the operation delay control can be executed without malfunction.

  The operation delay control means 60 may be configured as a part of the body system ECU 65. Since the second electric load 25 such as a headlamp is often controlled by the body system ECU 65, the operation delay control means 60 is incorporated as a part of the body system ECU 65 to facilitate the operation delay control. It can be carried out. Further, since the ECUs are often connected by an in-vehicle LAN (Local Area Network) such as a CAN (Controller Area Network), a state notification signal from the boost control means 50 in the control ECU 55 is sent to the body system ECU 65. The operation delay control means 60 can be easily received.

  Next, the operation flow of the vehicle power supply device according to the present embodiment will be described with reference to FIG. FIG. 3 is a process flow diagram of the vehicle power supply device according to the present embodiment.

  In FIG. 3, at step 100, the idling stop is restarted. Specifically, the starter 80 operates and the engine of the idling stop vehicle is driven. At this time, a large current is supplied from the battery 10 to the starter 80, and the output voltage of the battery 10 temporarily decreases.

  In step 110, the operation delay control means 60 outputs an operation delay command for delaying the operation of the second electric load 25 through which a large inrush current such as a headlamp flows. Even if the power switch 26 of the second electric load such as the headlamp is turned on by the user, control for delaying the operation is first executed so as not to start the operation.

  In step 120, it is determined whether or not the starter 80 for starting the engine is off and whether or not the boost converter 30 is off. Since these controls are executed by the control ECU 55, for example, the control ECU 55 makes a determination, and the result may be transmitted from the control ECU 55 to the operation delay control means 60 in the body system ECU 65 as a state notification signal.

  In step 120, it may be determined only whether boost converter 30 is operating, or whether starter 80 is operating in addition to whether boost converter 30 is operating. Moreover, it may be added as a determination condition. While the starter 80 is in operation, a large current flows and the voltage of the battery 10 decreases, and the boost converter 30 operates in conjunction with the timing. Actuation delay control can be performed.

  In step 120, when the starter 80 is operating or the boost converter 30 is operating, the process returns to step 110, and the operation delay control for delaying the operation of the second electric load 25 such as the headlamp is continued. Since step-up converter 30 is in operation or has a high possibility of starting operation, grounding of step-up converter 30 due to inrush current is prevented, and malfunction does not occur.

  On the other hand, in step 120, when starter 80 is off and boost converter 30 is off, there is no problem even if second electric load 25 such as a headlamp is turned on. The operation delay command made in (1) is canceled, the second electric load 25 is allowed to operate, and the process ends. Thereby, the boost command signal transmitted from the boost control means 50 to the boost converter 30 is correctly recognized, and the boost converter 30 can execute an appropriate boost operation. Accordingly, it is possible to reliably prevent the resetting of the first electric load such as the audio device or the navigation device when the stopped engine is restarted.

  In step 120, after it is determined that the boost converter 30 is not operating and the starter 80 is not operating, control is performed to turn on the second electric load 25 after a while. Also good.

  As described above, according to the vehicle power supply device according to the present embodiment, the boosting operation of the boosting converter 30 can be reliably performed, and the resetting of the audio device and the navigation device when the engine of the idling stop vehicle is restarted is eradicated. can do.

  Next, an example in which the vehicle power supply device according to the present embodiment is applied more specifically to an idling stop vehicle will be described with reference to FIG. FIG. 4 is a more detailed overall configuration diagram of the vehicle power supply device according to the present embodiment. Components corresponding to those in FIG. 1 are denoted by the same reference numerals.

  The vehicle power supply device according to FIG. 4 detects the voltage of the battery 10 provided as a power supply, the power supply line 20 and the boosting power supply line 40, the boosting converter 30, the control ECU 55, the body system ECU 65, and the power supply line 20. Voltage detection circuit 21 for detecting the voltage of the boosted power supply line 40, and a voltage detection circuit 41 for detecting the voltage of the boost power supply line 40.

  Voltage detection circuits 21 and 41 are generally provided in boost converter 30. The voltage detection circuit 21 detects an input voltage Vi that is a DC voltage of the power supply line 20 and generates a detection value Vid. Similarly, the voltage detection circuit 41 detects the DC voltage Vo of the boost power supply line 40 and generates a detection value Vod.

  A DC voltage is supplied from the battery 10 to the power supply line 20. In addition to the second electric load 25 such as a headlamp, a starter 80 and an alternator 90 are further connected to the power line 20. The starter 80 is coupled to the engine 70 by a gear only when the engine 70 is started by an electromagnetic switch or the like, and is disconnected from the engine 70 again after the engine 70 is ignited. Therefore, the starter 80 consumes a large current in a short time when the engine 70 is started.

  The alternator 90 incorporates an AC motor (not shown) that is rotated by the engine 70, converts the electric power generated by the AC motor into a constant voltage for charging the battery 10, and supplies it to the power supply line 20. That is, the alternator 90 charges the battery 10 while the engine 70 is operating, but cannot charge the battery 10 while the engine 70 is stopped. Thus, the output voltage of the battery 10 changes over time depending on the charge / discharge status.

  An output voltage Vo that is a power supply voltage of the first electric load 45 is supplied to the boost power supply line 40. The first electric load 45 is a collective term for a group of electric circuits that are easily affected by fluctuations in the power supply voltage. The first electric load 45 is reset with a significant drop in the power supply voltage, and the storage contents of the built-in storage means 46 are lost. A microcomputer, an audio device, a navigation device, and the like.

  For this reason, the power supply voltage Vo of the first electric load 45 is set as the output voltage of the boost converter 30 and can be boosted by the boost converter 30 as necessary.

  On the other hand, when the power switch 26 is turned on and the power is turned on, the second electric load 25 has a considerably larger inrush current than that in the steady state and is not much adversely affected by fluctuations in the supplied power supply voltage level. It is a general notation of no electrical circuit. Therefore, the output voltage of the battery 10 is directly supplied to such an electrical load 25 instead of the output voltage Vo from the boost converter 30. The second electric load 25 corresponds to, for example, a headlamp.

  The second electrical load 25 is basically controlled to be turned on / off by the user turning on / off the power switch 26. However, in the vehicular power supply apparatus according to the present embodiment, even when the power switch 26 is turned on by the user, when the boost converter 30 is in operation, the operation delay control is performed to delay the operation. In addition, a controllable switching means 61 is further provided. The switching means 61 is connected in series with the power switch 26 operated by the user. Even if the power switch 26 is turned on, if the switching means 61 is turned off, the second electric load 25 receives power. The configuration is such that it is not supplied. As the switching means 61, a relay that can be controlled by the operation delay control means 60 of the body system ECU 65 or a switching element such as a transistor is applied.

  The body system ECU 65 controls a lighting system such as a headlamp and an electric load related to a vehicle body such as an electric mirror. In the vehicle power supply device according to this embodiment, the body system ECU 65 incorporates an operation delay control means 60 that controls the operation delay of the second electric load that is a load having a large inrush current such as a headlamp. The operation delay control means 60 turns off the switching element 61 and turns on the power switch 26 by the user when detecting that the boost converter 30 is operating, for example, from a state notification signal sent from the control ECU 55. However, the operation of the second electric load 25 is delayed.

  Further, the body system ECU 65 may monitor on / off of the power switch 26 as necessary.

  The control ECU 55 generically shows a control circuit for comprehensively controlling the running state of the entire vehicle. In particular, since the vehicle power supply device according to this embodiment is assumed to be mounted on an idling stop vehicle, the control ECU 55 relates to idling stop based on idle determination information typified by vehicle speed, accelerator opening, and the like. A function for controlling stop and restart of the engine is provided.

  The control ECU 55 includes a stop command signal Ssp for instructing to stop the engine 70 during idle operation, a start command signal Sst for instructing start of the starter 80 when returning from idle operation, and a boost command for instructing the boost converter 30 to operate. Signal Vcv and target voltage Vref corresponding to the reference value of output voltage Vo when boost converter 30 operates are generated. Note that the boost command signal Vcv and the target voltage Vref to the boost converter 30 may be generated by a boost control means 50 built in the control ECU 55.

  Stop command signal Ssp and start command signal Sst generated by control ECU 55 are applied to engine 70 and starter 80, respectively, and start command signal Sst and target voltage Vref are applied to boost converter 30. Further, the detection value Vid of the input voltage Vi and the detection value Vod of the output voltage Vo by the voltage detection circuits 21 and 41 are configured to be sampled by the control ECU 55 as necessary.

  The control ECU 55 transmits a state notification signal to the body system ECU 65 as to whether or not the boost converter 30 is operating, and if necessary, whether or not the starter 80 is operating. Since the control ECU 55 generates the boost command signal Vcv that instructs the boost converter 30 to operate and the start command signal Sst that instructs the starter 80 to start, based on this, the state notification signal is transmitted to the body ECU 65. That's fine.

  Boost converter 30 includes a smoothing reactor 31 and a diode 32, a power switching element 33 and a smoothing capacitor 34, and a converter control unit 35 connected in series between power supply line 20 and boosting power supply line 40.

  Converter control unit 35 generates a gate signal Ggt for controlling on and off of power switching element 33, and turns on or off power switching element 33 in accordance with gate signal Ggt from duty control unit 36. And a driver 37.

  Boost converter 30 has a so-called non-insulated boost chopper configuration, and sets the ratio of on-time Ton and off-time Toff in each switching period T of power switching element 33, that is, the output of input voltage Vi with respect to the duty ratio. The voltage Vo ratio, that is, the boost ratio Vo / Vi is controlled. Specifically, the boost ratio of the boost converter 30 is determined by the following equation (1).

Vo / Vi = 1 / (1-d) (1)
Here, d is a duty ratio represented by d = Ton · T = Ton / (Ton + Toff).

  That is, the duty control unit 36 sets the duty ratio d based on the detection value Vid of the input voltage Vi and the detection value Vod of the output voltage Vo by the voltage detection circuits 21 and 41 and the target voltage Vref from the control ECU 55. The gate signal is generated so as to satisfy the duty ratio.

  In this manner, boost converter 30 operates intermittently in response to boost command signal Vcv from control ECU 55, boosts input voltage Vi corresponding to the output voltage of battery 10 during operation, and achieves target voltage Vref. The output voltage Vo according to the above is output.

  That is, boost power supply line 40 receives the output voltage of battery 10 when boost converter 30 is not operating, and receives the output voltage from boost converter 30 according to target voltage Vref when boost converter 30 is operating.

  In this manner, boost converter 30 outputs target voltage Vref to boost power supply line 40 in accordance with boost command signal Vcv so that power supply to first electrical load 45 is not interrupted. During the operation of the boost converter 30, the control ECU 55 notifies the body system ECU 65 that the boost converter 30 is operating by a state notification signal, and the operation delay control means 60 of the body system ECU 65 receives the second electric control unit 60. Control is performed to turn off the switching means 61 so that the load 25 does not operate. Thereby, it is possible to prevent the boost command signal Vcv from being erroneously recognized as the stop state signal due to the inrush current of the second electric load, and the first when the engine 70 of the idling stop vehicle is restarted. 1 can be prevented from being reset.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the present invention. Can be added.

1 is a block diagram of a main configuration of a vehicle power supply device according to an embodiment to which the present invention is applied. 6 is a diagram showing experimental data in which a headlamp is powered on during operation of boost converter 30. FIG. It is a processing flow figure of the power supply device for vehicles concerning this example. It is a more detailed whole block diagram of the vehicle power supply device which concerns on a present Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Battery 20 Power supply line 25 2nd electric load 26 Power switch 30 Boost converter 31 Smoothing reactor 32 Diode 33 Power switching element 34 Smoothing capacitor 35 Converter control part 36 Duty control part 37 Driver 40 Boost power supply line 45 1st electric load 46 Storage means 50 Control ECU
55 Boost control means 60 Operation delay control means 65 Body ECU
70 Engine 80 Starter 90 Alternator

Claims (6)

A battery for supplying power to the starter of the engine when restarting the stopped engine;
A boost converter that boosts the voltage of the battery and supplies power to the first electrical load when the starter is activated;
An operation delay control means for performing an operation delay control for delaying the operation of the second electric load through which an inrush current flows when the power switch is turned on when connected to the battery;
The vehicle power supply apparatus, wherein the operation delay control means executes the operation delay control when the boost converter is in operation.   2. The vehicle power supply device according to claim 1, wherein the operation delay control means executes the operation delay control when the starter is operating. Further comprising boost control means for operating the boost converter by sending a boost command signal to the boost converter;
3. The vehicle power supply device according to claim 1, wherein the operation delay control unit executes the operation delay control based on a state notification signal from the boost control unit.   2. The first electric load includes a storage unit, and includes an electric load that resets a storage content of the storage unit when a voltage of the supplied electric power becomes a predetermined value or less. The power supply device for vehicles as described in any one of thru | or 3.   The vehicular power supply device according to any one of claims 1 to 4, wherein the second electric load includes a headlamp.   6. The vehicle is mounted on an idling stop vehicle that stops an engine when a preset engine stop condition is satisfied and operates the starter when a preset engine restart condition is satisfied. The vehicle power supply device according to any one of the above.