JP2012222938A - Power supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maximize the period for maintaining standby state and thus shorten the time required for restarting on-vehicle equipment.SOLUTION: A power supply device 10 supplies electric power to on-vehicle equipment 20 from an on-vehicle battery 11 or a secondary battery (built-in battery 12) included in the on-vehicle equipment 20. The power supply device 10 includes a power supply control section 14 for performing control so as to set the on-vehicle equipment 20 in a standby state when detecting powering-off of the on-vehicle equipment 20, prioritize either the on-vehicle battery 11 or the built-in battery 12 with respect to the on-vehicle equipment 20, and supply electric power by using both of the on-vehicle battery 11 and the secondary battery.

Description

  The present invention relates to an in-vehicle power supply apparatus that supplies power to an in-vehicle device such as a car navigation system using either an in-vehicle battery or a secondary battery.

  For example, in Patent Document 1, for the purpose of shortening the start-up time of an in-vehicle device, when an ignition key is turned off and the supply of accessory power is detected, power is supplied from the secondary battery to the in-vehicle device. Discloses a technology relating to a power supply control device for setting the power to a standby state (sleep state).

  Here, the “standby state” means that data is supplied only to a volatile memory (for example, DRAM: Dynamic Random Access Memory) and immediately before the power supply from the accessory power supply of the vehicle is stopped (for example, program In other words, when the accessory power supply is turned on again, the data can be restored to the state just before the power supply is stopped and resumed from that state. There is also a “standby state (hibernation)” in which data is stored in a non-volatile memory such as an HDD (Hard Disc Drive) in contrast to a “standby state” in which data is stored in a volatile memory.

  As described above, in the “resting state” in which data is stored in the HDD, no electric power is required to hold the data. However, the hibernation state has a disadvantage that the start-up time of the in-vehicle device is delayed when the accessory power is turned on again compared to the standby state.

  According to the technique disclosed in Patent Document 1, the secondary battery is not charged in the standby state, and the standby state is maintained only by the secondary battery. There was a problem that the time required for restarting the in-vehicle device could not be shortened.

JP 2004-94732 A

  An object of the present invention is to provide a power supply apparatus that can extend the period for maintaining the standby state as much as possible and reduce the time required for restarting the in-vehicle device.

  The invention according to claim 1 is an electric power supply device that supplies electric power to an in-vehicle device by an in-vehicle battery or a secondary battery included in the in-vehicle device, and detects the in-vehicle device when power-off of the in-vehicle device is detected. A power supply control unit that sets to a standby state, gives priority to either the in-vehicle battery or the secondary battery, and supplies power to both the in-vehicle battery and the secondary battery. It is characterized by having.

  According to a second aspect of the present invention, in the power supply device according to the first aspect, the power supply control unit preferentially supplies power from the in-vehicle battery until a predetermined condition is detected, and the predetermined condition The power is controlled to be supplied from the secondary battery after the detection of.

  According to a third aspect of the present invention, in the power supply device according to the first aspect, the power supply control unit preferentially supplies power from the secondary battery until a predetermined condition is detected. Control is performed so that power is supplied from the in-vehicle battery after the condition is detected.

  According to a fourth aspect of the present invention, in the power supply device according to the second or third aspect, the power supply control unit acquires the power supply from the secondary battery by communicating with the secondary battery. This is performed until the remaining amount of the secondary battery reaches a predetermined value.

  According to a fifth aspect of the present invention, in the power supply device according to the second or third aspect, the power supply control unit performs power supply from the in-vehicle battery until a predetermined time elapses.

  According to a sixth aspect of the present invention, in the power supply device according to any one of the first to fifth aspects, the power supply control unit is configured to use the on-board battery for a predetermined time and to leave the secondary battery. When the amount reaches a predetermined value, the in-vehicle device is set in a dormant state.

  According to a seventh aspect of the present invention, in the power supply device according to the first aspect, the power supply control unit supplies either the in-vehicle battery or the secondary battery to the in-vehicle device according to setting information input from the outside. Control is performed so that power is supplied to both the in-vehicle battery and the secondary battery by setting one as a power supply source and giving priority to either.

  In the invention according to claim 1, when the power supply control unit detects the power-off of the in-vehicle device, the in-vehicle device sets the in-vehicle device in a standby state, and gives priority to either the in-vehicle battery or the secondary battery to the in-vehicle device, And the secondary battery are controlled to supply power. For this reason, compared with the case where the standby state is maintained with only the secondary battery, the period for maintaining the standby state becomes longer, and during that time, the time required for restarting the in-vehicle device can be shortened.

  In the invention according to claim 2, the power supply control unit preferentially supplies power from the in-vehicle battery until a predetermined condition is detected, and supplies power from the secondary battery after the predetermined condition is detected. . For this reason, power consumption by the secondary battery can be delayed as much as possible. Accordingly, the life of the secondary battery can be extended when the on-vehicle device is taken out of the vehicle and used.

  In the invention according to claim 3, the power supply control unit preferentially supplies power from the secondary battery until a predetermined condition is detected, and supplies power from the in-vehicle battery after the predetermined condition is detected. . Therefore, the power consumption by the vehicle battery can be delayed as much as possible.

  In the invention according to claim 4, the power supply control unit performs the power supply from the secondary battery until the remaining amount of the secondary battery acquired by communicating with the secondary battery reaches a predetermined value. In this way, by monitoring the remaining amount of the secondary battery by communication, it is easy to estimate the remaining amount of the secondary battery.

  In the invention which concerns on Claim 5, a power supply control part performs the power supply from a vehicle-mounted battery until predetermined time passes. Therefore, the remaining amount of the in-vehicle battery can be estimated without using communication by calculating the remaining amount of the in-vehicle battery by time monitoring.

  In the invention according to claim 6, the power supply control unit sets the in-vehicle device to a dormant state when the usage time of the in-vehicle battery elapses for a predetermined time and the remaining amount of the secondary battery reaches a predetermined value. For this reason, although the starting time at the time of re-turning on the power becomes long, the in-vehicle device can be surely restarted.

  In the invention according to claim 7, the power supply control unit determines which of the in-vehicle battery and the secondary battery has priority in supplying the power to the in-vehicle device according to the external input information. Therefore, convenience is improved by selecting the power supply source based on the user's convenience.

It is a block diagram which shows the structural example of the electric power supply apparatus which concerns on embodiment of this invention. It is a 1st control flow of the electric power supply apparatus which concerns on embodiment of this invention. It is a 2nd control flow of the electric power supply apparatus which concerns on embodiment of this invention. It is a block diagram which shows the structure of the modification of the electric power supply apparatus which concerns on embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

First, an embodiment of the present invention (hereinafter referred to as the present embodiment) will be described with reference to the drawings.
The power supply apparatus 10 according to the present embodiment supplies power to the in-vehicle device 20 by using the in-vehicle battery 11 or a secondary battery (hereinafter referred to as a built-in battery 12) included in the in-vehicle apparatus 20. As shown, in addition to the on-vehicle battery 11 and the built-in battery 12 described above, a power supply circuit 13 and a power supply control unit 14 are included.

  The power supply circuit 13 receives power supply from the in-vehicle battery 11 and the built-in battery 12, switches to one of the power supplies under the control of the power supply control unit 14, and supplies power to the main board 21 of the in-vehicle device 20. . As the power supply control unit 14, for example, a microprocessor (hereinafter referred to as a sub CPU 14) is mounted. When the sub CPU 14 determines that the in-vehicle device 20 is in the “OFF state” by inter-processor communication with the main CPU 210 mounted on the main board 21 described later, the in-vehicle battery 11 or the built-in battery 14 The power supply circuit 13 is controlled to supply power with priority given to any of the batteries 12.

  When the sub CPU 14 preferentially supplies power to either the in-vehicle battery 11 or the built-in battery 12, the sub CPU 14 preferentially supplies power from the in-vehicle battery 11 until a predetermined condition is detected, and the predetermined condition is detected. Then, control is performed so that power is supplied from the built-in battery 12. Further, the sub CPU 14 may perform control so that power is preferentially supplied from the built-in battery 12 until a predetermined condition is detected, and power is supplied from the in-vehicle battery 11 after the predetermined condition is detected. .

  Further, the sub CPU 14 also performs control for setting the in-vehicle device 20 to a dormant state when both the remaining amounts of the in-vehicle battery 11 and the built-in battery 12 reach a predetermined value. The sub CPU 14 may perform power supply control by preferentially setting either the in-vehicle battery 11 or the built-in battery 12 as a power supply source for the in-vehicle device 20 according to setting information input from the outside.

  The sub CPU 14 can monitor the remaining battery capacity of the built-in battery 12 by communicating with the built-in battery 12 via the power supply circuit 13. The sub CPU 14 also performs charge control of the built-in battery 12 via the power supply circuit 13.

  A system in which at least a main CPU 210, a volatile memory (DRAM) 211, and a hard disk controller (HDC 212) are composed of a plurality of lines for address, data, and control on the main board 21 of the in-vehicle device 20. Commonly connected via the bus 213 and mounted. The HDC 212 is connected to a hard disk device (HDD 22) that is a nonvolatile memory.

(Control of Example 1)
Hereinafter, the control contents of the power supply apparatus 10 according to the present embodiment will be described in detail with reference to FIG. 1 and FIG. 2 and FIG. 3.

  In step ST01, the main CPU 210 determines whether or not the in-vehicle device 20 is in the “OFF state”. Here, the “OFF state” refers to a state where the engine key is in the OFF position. Even if the in-vehicle device 20 is in the “OFF state”, the main CPU 210 can be supplied with power by a constant power source (backup power source). When the main CPU 210 determines that the in-vehicle device 20 is in the “OFF state”, the main CPU 210 notifies the sub CPU 14 of the fact and proceeds to the next step S102. On the other hand, if it is determined that the state is “ON state”, the determination in step ST01 is repeated until it is determined that the state is “OFF state”.

  In step ST02, the main CPU 210 determines “whether there is a user setting of the power supply source” in the standby state. Specifically, it is determined whether or not a switching unit (not shown) that determines whether to use the in-vehicle battery 11 with priority or the built-in battery 12 is in an “ON state”. . This switching unit is connected to the main CPU 210 and, for example, sends a signal when in the “ON state” and does not send a signal when in the “OFF state”. As a result, the main CPU 210 can determine whether or not the switching unit is in the “ON state”, that is, it can determine “whether there is a user setting of the power supply source”. When it is determined that the state is “ON state”, the process proceeds to the next step ST03. On the other hand, if it is determined to be in the “OFF state”, the process proceeds to step ST04.

  In step ST03, the main CPU 210 performs control so that the power supply source set in advance by the user is preferentially used. Specifically, the main CPU 210 determines whether the power supply source (that is, the power supply source to be used with priority) set by the switching unit is the in-vehicle battery 11 or the built-in battery 12. For example, when the in-vehicle battery 11 is set, the switching unit sends a flag signal “1” to the main CPU 210. If the built-in battery 12 is set, a flag signal “0” is sent to the main CPU 210. Thus, the main CPU 210 can determine the power supply source set by the user in advance based on the flag signal. Thereafter, the main CPU 210 sends a control signal to the sub CPU 14 so as to preferentially use the power supply source determined based on the flag signal. When the transmission of the control signal is completed, the process proceeds to the next step ST04.

  Note that the priority control in step ST02 to step ST03 may or may not be present, that is, the switching unit may or may not be present. When there is no switching part, it progresses to step ST04 after completion | finish of step ST01.

In step ST04, the sub CPU 14 determines whether to use the in-vehicle battery 11 with priority based on the control signal when there is a switching unit and based on the initial setting when there is no switching unit. When it is determined that the in-vehicle battery 11 is used with priority, control is performed via the power supply circuit 13 so that the in-vehicle battery 11 starts to supply power. When the control is completed, the process proceeds to the next step ST05. On the other hand, when it is determined that the built-in battery 12 is used with priority, control is performed via the power supply circuit 13 so that the built-in battery 12 starts to supply power. When the control is completed, the process proceeds to step ST12 in FIG.
In the present embodiment, the setting for using the in-vehicle battery 11 with priority is described as the initial setting, but the setting for using the built-in battery 12 with priority may be used as the initial setting.

  In step ST05, the vehicle-mounted battery 11 is set to the “standby state”. Specifically, when power is supplied from the in-vehicle battery 11 to the in-vehicle device 20, the main CPU 210 temporarily stores data immediately before the in-vehicle device 20 enters the “OFF state” (hereinafter referred to as “immediate data”). Is stored in the DRAM 211. Note that a small amount of the capacity of the in-vehicle battery 11 is consumed while the data is stored in the DRAM 211. The main CPU 210 can determine that the saving to the DRAM has been completed via the system bus 213. If the main CPU 210 determines that the saving has been completed, the main CPU 210 notifies the sub CPU 14 of the completion and the next step. Proceed to ST07.

  In step ST06, the sub CPU 14 estimates the remaining amount of the in-vehicle battery 11. Here, since the sub CPU 14 and the in-vehicle battery 11 are not electrically connected, the sub CPU 14 can estimate the remaining amount A of the in-vehicle battery 11 by using, for example, a counter (not shown). This counter can start counting when the sub CPU 14 determines that the vehicle-mounted battery 11 is used preferentially (corresponding to step ST04). Thus, since the sub CPU 14 can obtain the remaining amount A of the in-vehicle battery 11 by calculation through time monitoring by a counter, it can estimate the remaining amount A of the in-vehicle battery 11 without communication. When the estimation of the remaining battery level is completed, the process proceeds to the next step ST07.

  In step ST07, the sub CPU 14 determines whether or not the remaining amount A of the in-vehicle battery 11 is less than the first threshold value As. When it is determined that the remaining amount A is equal to or greater than the first threshold value As, the process returns to step ST05, and the “standby state” by the in-vehicle battery 11 is maintained. On the other hand, when it is determined that the remaining amount A is less than the first threshold value As, the process proceeds to the next step ST08.

  In step ST08, the internal battery 12 is set to the “standby state”. Specifically, when power is supplied from the built-in battery 12 to the in-vehicle device 20, the main CPU 210 temporarily stores the immediately preceding data in the DRAM 211. Note that a small amount of the capacity of the internal battery 12 is consumed while the data is stored in the DRAM 211. The main CPU 210 can determine that the saving to the DRAM has been completed via the system bus 213. If the main CPU 210 determines that the saving has been completed, the main CPU 210 notifies the sub CPU 14 of the completion and the next step. Proceed to ST09.

  In step ST09, the sub CPU 14 estimates the remaining amount B of the built-in battery 12. Here, since the sub CPU 14 and the internal battery 12 are electrically connected, the sub CPU 14 can easily estimate the remaining amount B of the internal battery 12. When the estimation of the remaining battery level is completed, the process proceeds to the next step ST10.

  In step ST10, the sub CPU 14 determines whether or not the remaining amount B of the internal battery 12 is less than the second threshold value Bs. When it is determined that the remaining amount B is equal to or greater than the second threshold value Bs, the process returns to step ST08 and the “standby state” by the built-in battery 11 is maintained. On the other hand, if it is determined that the remaining amount B is less than the second threshold value Bs, the main CPU 210 is informed and the process proceeds to the next step ST11.

  In step ST11, the main CPU 210 sets the “pause state”. Specifically, the main CPU 210 transfers the immediately preceding data stored in the “standby state” (corresponding to step ST05 and step ST08) from the DRAM 211 to the HDD 22. By transferring the data to the HDD 22, the data can be reliably stored even if the power supply by the in-vehicle battery 11 and the built-in battery 12 is lost.

  Step ST12 is the same as step ST08. That is, the “standby state” is set by the built-in battery 12. Specifically, when power is supplied from the built-in battery 12 to the in-vehicle device 20, the main CPU 210 temporarily stores the immediately preceding data in the DRAM 211. Note that a small amount of the capacity of the internal battery 12 is consumed while the data is stored in the DRAM 211. The main CPU 210 can determine that the storage in the DRAM 211 has been completed via the system bus 213. If the main CPU 210 determines that the storage has been completed, the main CPU 210 notifies the sub CPU 14 of the completion and the next step. Proceed to ST13.

  Step ST13 is the same as step ST09. That is, the sub CPU 14 estimates the remaining amount B of the built-in battery 12. Here, since the sub CPU 14 and the internal battery 12 are electrically connected, the sub CPU 14 can easily estimate the remaining amount B of the internal battery 12. When the estimation of the remaining battery level is completed, the process proceeds to the next step ST14.

  Step ST14 is the same as step ST10. That is, the sub CPU 14 determines whether or not the remaining amount B of the built-in battery 12 is less than the second threshold value Bs. When it is determined that the remaining amount B is equal to or greater than the second threshold value Bs, the process returns to step ST12 and the “standby state” by the built-in battery 11 is maintained. On the other hand, if it is determined that the remaining amount B is less than the second threshold value Bs, the main CPU 210 is informed and the process proceeds to the next step ST15.

  Step ST15 is the same as step ST05. That is, the vehicle-mounted battery 11 is set to the “standby state”. Specifically, when power is supplied from the in-vehicle battery 11 to the in-vehicle device 20, the main CPU 210 temporarily stores the immediately preceding data in the DRAM 211. Note that a small amount of the capacity of the in-vehicle battery 11 is consumed while the data is stored in the DRAM 211. The main CPU 210 can determine that the storage in the DRAM 211 has been completed via the system bus 213. If the main CPU 210 determines that the storage has been completed, the main CPU 210 notifies the sub CPU 14 of the completion and the next step. Proceed to ST16.

  Step ST16 is the same as step ST06. That is, the sub CPU 14 estimates the remaining amount of the in-vehicle battery 11. Here, since the sub CPU 14 and the in-vehicle battery 11 are not electrically connected, the sub CPU 14 can estimate the remaining amount A of the in-vehicle battery 11 by using, for example, a counter. For example, this counter can start counting when the sub CPU 14 determines that the remaining amount B of the internal battery 12 is less than the second threshold value Bs (corresponding to step ST14). Thus, since the sub CPU 14 can obtain the remaining amount A of the in-vehicle battery 11 by calculation through time monitoring by a counter, it can estimate the remaining amount A of the in-vehicle battery 11 without communication. When the estimation of the remaining battery level is completed, the process proceeds to the next step ST17.

  Step 17 is the same as step ST07. That is, the sub CPU 14 determines whether or not the remaining amount A of the in-vehicle battery 11 is less than the first threshold value As. When it is determined that the remaining amount A is equal to or greater than the first threshold value As, the process returns to step ST15 and the “standby state” by the in-vehicle battery 11 is maintained. On the other hand, when it is determined that the remaining amount A is less than the first threshold value As, the process proceeds to the next step ST18.

  Step 18 is the same as step ST11. That is, the main CPU 210 sets the “pause state”. Specifically, the main CPU 210 transfers the immediately preceding data stored in the “standby state” (corresponding to step ST05 and step ST08) from the DRAM 211 to the HDD 22. By transferring the data to the HDD 22, the data can be reliably stored even if the power supply by the in-vehicle battery 11 and the built-in battery 12 is lost.

  Although not shown in the flowcharts of FIG. 2 and FIG. 3, when the power-on (ON) of the in-vehicle device 20 in the “standby state” or “hibernation state” is detected, the main CPU 210 The previous data stored in the DRAM 211 or the HDD 22 can be restored to the DRAM 211, and, for example, the program can be executed continuously from the state immediately before the program is stopped.

(Modification)
According to the present embodiment, the in-vehicle battery 11 and the built-in battery 12 are connected in parallel, and the charging of the built-in battery 12 is controlled by the power supply control unit 14. For example, FIG. As described above, the in-vehicle battery 11 and the built-in battery 12 may be connected in series via the charging circuit 15 controlled by the power supply control unit 14. However, in this case, power supply to the in-vehicle device 20 is always performed via the built-in battery 12 regardless of which is prioritized.

(Effect of Example)
As described above, according to the present embodiment, when the power supply control unit (sub CPU 14) detects the power-off of the in-vehicle device 20, the in-vehicle device 20 is set in a standby state, and the in-vehicle battery is connected to the in-vehicle device 20. 11 or the built-in battery 12 is controlled so as to supply power preferentially. For this reason, compared with the case where the standby state is maintained only with the built-in battery 12, the period for maintaining the standby state becomes longer, and during that time, the time required for restarting the in-vehicle device can be shortened.

  According to the present embodiment, the power supply control unit (sub CPU 14) preferentially supplies power from the in-vehicle battery 11 until a predetermined condition is detected, and the built-in battery after the predetermined condition is detected. 12 to supply power. For this reason, the power consumption by the internal battery 12 can be delayed as much as possible. Therefore, it is possible to extend the life of the built-in battery 12 when the in-vehicle device 20 is taken out and used.

  Further, according to the present embodiment, the power supply control unit (sub CPU 14) preferentially supplies power from the built-in battery 12 until a predetermined condition is detected, and the vehicle-mounted battery after the predetermined condition is detected 11 to supply power. Therefore, power consumption by the in-vehicle battery 11 can be delayed as much as possible.

  In addition, according to the present embodiment, the power supply control unit (sub CPU 14) determines that the power supply from the internal battery 12 is such that the remaining amount of the internal battery 12 obtained by communicating with the internal battery 12 is a predetermined value. Do until. As described above, by monitoring the remaining amount of the built-in battery 12 through communication, the remaining amount of the built-in battery 12 can be easily estimated.

  Further, according to the present embodiment, the power supply control unit (sub CPU 14) supplies power from the in-vehicle battery 11 until a predetermined time elapses. Therefore, the remaining amount of the in-vehicle battery 11 can be estimated without using communication by calculating the remaining amount of the in-vehicle battery 11 by time monitoring.

  Further, according to the present embodiment, the power supply control unit (sub CPU 14) switches the in-vehicle device when the usage time of the in-vehicle battery 11 elapses for a predetermined time and the remaining amount of the built-in battery 12 reaches a predetermined value. Set to hibernation. For this reason, although the starting time at the time of re-turning on the power becomes long, the in-vehicle device can be surely restarted.

  Further, according to the present embodiment, the power supply control unit (sub CPU 14) determines which of the in-vehicle battery 11 and the built-in battery 12 is to be prioritized to supply power to the in-vehicle device 20 according to the external input information. Therefore, convenience is improved by selecting the power supply source based on the user's convenience.

  DESCRIPTION OF SYMBOLS 10 ... Electric power supply apparatus, 11 ... Car battery, 12 ... Secondary battery (built-in battery), 13 ... Electric power supply circuit, 14 ... Electric power supply control part (sub CPU), 15 ... Charging circuit, 20 ... Car equipment, 21 ... Main board, 22 ... Nonvolatile memory (HDD), 210 ... Main CPU, 211 ... Volatile memory (DRAM), 212 ... Hard disk controller (HDC)

Claims (7)

A power supply device that supplies power to an in-vehicle device using an in-vehicle battery or a secondary battery included in the in-vehicle device,
When detecting power-off of the in-vehicle device, the in-vehicle device is set to a standby state, and the in-vehicle device or the secondary battery is given priority over the in-vehicle device, and the in-vehicle battery and the secondary battery are A power supply control unit that controls power supply on both sides,
A power supply apparatus comprising: The power supply control unit
The control is performed so that power is preferentially supplied from the in-vehicle battery until a predetermined condition is detected, and power is supplied from the secondary battery after the predetermined condition is detected. 1. The power supply device according to 1. The power supply control unit
The power supply is preferentially performed from the secondary battery until a predetermined condition is detected, and control is performed so that power is supplied from the in-vehicle battery after the predetermined condition is detected. 1. The power supply device according to 1. The power supply control unit
The electric power supply from the said secondary battery is performed until the residual amount of the said secondary battery acquired by communicating with the said secondary battery becomes a predetermined value, The electric power of Claim 2 or 3 characterized by the above-mentioned. Feeding device. The power supply control unit
The power supply apparatus according to claim 2 or 3, wherein power supply from the in-vehicle battery is performed until a predetermined time elapses. The power supply control unit
6. The in-vehicle device is set to a dormant state when the use of the in-vehicle battery elapses for a predetermined time and the remaining amount of the secondary battery reaches a predetermined value. The power supply device according to claim 1. The power supply control unit
In accordance with setting information input from the outside, either the in-vehicle battery or the secondary battery is set as a power supply source for the in-vehicle device, and either one is prioritized, and power is supplied to both the in-vehicle battery and the secondary battery. The power supply apparatus according to claim 1, wherein the power supply apparatus is controlled to perform supply.

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