JP2010163047A - Electronic apparatus and power supply control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic apparatus and a power supply control method which enable a necessary operation for stopping the electronic apparatus while eliminating dark current from a battery power source, and do not need to receive power supply from an ACC power source. <P>SOLUTION: A detachable grille 20 includes a line 201 for making up a part of a supply route that supplies power to a microcomputer 11 via a second power source part 14 from a BU power source 2 by being attached to a body 10 and for electrically separating from the supply route on the side of the body 10 by being detached from the body 10. When it is detected that the detachable grille 20 is detached from the body 10, the microcomputer 11 cuts power supply from a first power source part 13 by turning a switch 17 off. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present application relates to a technical field of an electronic device that is mounted on a moving body such as a vehicle and operates by power supplied from a battery power supply and a method for controlling power supply thereof.

  For example, there are a battery power source and an ACC (accessory) power source as power sources for electronic devices that are mounted on a dashboard of a vehicle, such as a car stereo or a car navigation system, and operate by a passenger's operation. When the ACC power is turned off, the electronic device stops the current operation and stops, but the battery power is used to save information such as the operation state and user setting data at this time in the memory. There is a need to. However, even when the vehicle engine is in a stopped state, a current (dark current) always flows from the battery power source to the electronic device in order to retain the memory. Measures are taken.

  For example, in Patent Document 1, in order to prevent the occurrence of dark current in a device mounted on a vehicle that does not have an accessory position in an ignition switch, when the separation of a grill that is detachably provided on the device body is detected, A car stereo that shifts the operation of the microcomputer of the main body from the normal operation processing mode to the low consumption operation processing mode is described.

  In Patent Document 2, in a vehicular electronic device that is supplied with power from both a battery power source and an ACC power source, when the ACC power source is turned off, data stored in an internal memory is written into a non-volatile memory. After performing the post-processing, the control switch is turned off to shut off the battery power.

Japanese Utility Model Publication No. 5-60953 JP 2001-322515 A

  However, in the technique described in Patent Document 1, the dark current itself does not become zero even when the mode is shifted to the low-consumption operation processing mode. Therefore, if the vehicle is left for a long time with the engine stopped, the engine may not operate due to battery exhaustion.

  On the other hand, with the technique described in Patent Document 2, although the dark current when the engine is stopped can be zero, it is necessary to receive power supply from the ACC power supply in addition to the battery power supply. If the power supply from the ACC power supply is not received, once the battery power supply is cut off, the control switch cannot be turned on again and the electronic device cannot be activated. And in order to receive the electric power supply from an ACC power supply, it is necessary to provide the power supply circuit for ACC power supplies in an electronic device.

  The present application has been made in view of the above points, and an example of the problem is that it is possible to eliminate the dark current from the battery power supply while enabling the necessary operation when stopping the electronic device, and the ACC power supply. It is an object of the present invention to provide an electronic device and a power supply control method that do not require the supply of power from the power supply.

  In order to solve the above problems, in one aspect of the present application, a device main body, a mounting portion provided with an operation member operated by a passenger of a moving body, and detachably mounted on the device main body, An electronic device mounted on the mobile body, wherein the device main body controls the operation of the electronic device and power from a battery power source mounted on the mobile body. First power supply means and second power supply means for supplying to each of the first and second power supply means, and detection means for detecting the removal of the mounting portion from the device body, wherein the mounting portion has the mounting portion on the device body. By being mounted, a part of a supply path for supplying power from the battery power source to the control unit via the second power supply unit is configured, and the mounting unit is removed from the device main body. A conductor portion electrically disconnected from the supply path on the device main body side, and the control means detects the first power supply when it is detected that the mounting portion is removed from the device main body. The power supply from the means to itself is stopped.

  In another aspect of the present application, the mobile body includes a device main body and a mounting portion that is provided with an operation member that is operated by a passenger of the mobile body and is detachably mounted to the device main body. A first power supply that is an electronic device to be mounted, wherein the device main body supplies power from a battery power source mounted on the mobile body to the control unit, which controls the operation of the electronic device. And a second power supply unit, and the mounting unit supplies power from the battery power source to the control unit via the second power supply unit by mounting the mounting unit on the device body. This is implemented by an electronic device that includes a conductor portion that constitutes a part of a supply path for performing the operation and is electrically disconnected from the supply path on the device body side when the mounting portion is removed from the device body. In the power supply control method, when the detection unit detects that the mounting portion has been removed from the device body, the power supply from the first power supply unit to the control unit is stopped. It is characterized by.

It is a block diagram which shows an example of schematic structure of the vehicle-mounted electronic device 1 which concerns on one Embodiment. It is a flowchart which shows the process example by the microcomputer 11 of the vehicle-mounted electronic device 1 which concerns on one Embodiment.

  Hereinafter, the best embodiment of the present application will be described in detail with reference to the drawings. In addition, embodiment described below is embodiment at the time of applying this application with respect to a vehicle-mounted electronic device.

[1. Configuration of in-vehicle electronic device 1]
First, the configuration of the in-vehicle electronic device 1 according to the present embodiment will be described with reference to FIG.

  FIG. 1 is a block diagram illustrating an example of a schematic configuration of an in-vehicle electronic device 1 according to the present embodiment.

  The in-vehicle electronic device 1 is, for example, an electronic device such as a car stereo or a car navigation equipped on a dashboard of a vehicle, but is not limited to these. As shown in FIG. 1, the in-vehicle electronic device 1 includes a main body 10 as an example of a device main body and a detach grill 20 as an example of a mounting portion. The detach grill 20 can be detached from the main body 10 for the purpose of preventing the theft electronic device 1 from being stolen.

  The main body 10 includes a microcomputer 11 as an example of a control unit, a nonvolatile memory 12 as an example of a storage unit, a first power supply unit 13 as an example of a first power supply unit, and a second power supply. A second power supply unit 14 as an example of a means, a grill attachment / detachment detection circuit 15 as a series of detection means, an ACC detection circuit 16 as an example of an ACC power supply detection means, a switch 17, terminals 18a to 18d, a line 101 to 107. The main body 10 includes a mechanical unit (not shown) such as an optical disk drive. On the other hand, the detachment grill 20 includes an operation unit 21, terminals 22a to 22d, and a line 201 as an example of a conductor unit.

  Here, the lines 101 to 107 and the line 201 are wirings for supplying power from a vehicle-mounted BU (backup) power source 2 as an example of a battery power source. Further, when the detach grill 20 is mounted on the main body 10, the terminals 18a and 22a, the terminals 18b and 22b, the terminals 18c and 22c, and the terminals 18d and 22d come into contact with each other.

  The microcomputer 11 includes a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like, and includes an operation of the mechanical unit by reading and executing a control program recorded in the ROM. The overall electronic device 1 is controlled.

  The non-volatile memory 12 is, for example, a flash memory, and current state data (an example of information related to control) indicating the operation state of the in-vehicle electronic device 1 and user setting data (control) set by a user such as option setting An example of information related to

  The first power supply unit 13 and the second power supply unit 14 are both power supply circuits, and supply power from the BU power supply 2 to supply necessary voltages to the microcomputer 11 and the mechanical unit.

  The grill attachment / detachment detection circuit 15 detects the attachment / detachment of the detachment grill 20 with respect to the main body by detecting the contact state between the terminal 18d and the terminal 22d, and outputs a detection signal as a detection result to the microcomputer 11.

  The ACC detection circuit 16 detects ON / OFF of the ACC power supply 3 and outputs a detection signal as a detection result to the microcomputer 11.

  The switch 17 is a switch for controlling power supply from the first power supply unit 13 to the microcomputer 11, and is controlled by the microcomputer 11.

  For example, the operation unit 21 includes an operation member such as a button or a switch. When the detach grill 20 is mounted on the main body 10, the operation unit 21 receives an operation signal corresponding to the user's operation content on the operation member through the terminal 22c and the terminal 18c. To the microcomputer 11.

  In the in-vehicle electronic device 1 having such a configuration, the current from the BU power supply 2 is supplied to the first power supply unit 13 through the line 101 and is supplied to the second power supply unit 14 through the line 102. . Then, the current from the first power supply unit 13 is supplied to the microcomputer 11 through the wiring in the order of the line 103, the switch 17, the line 104, and the line 105 when the switch 17 is ON.

  In addition, when the detach grill 20 is attached to the main body 10, the current from the second power supply unit 14 is supplied to the line 106, the terminal 18 a, the terminal 22 a, the line 201, the terminal 22 b, the terminal 18 b, the line 107, and the line 105. It is supplied to the microcomputer 11 through wiring in order. When the detaching grill 20 is detached from the main body 10, the terminals 18 a and 22 a and the terminals 18 b and 22 b are not in contact with each other, so that the current from the second power supply unit 14 is not supplied to the microcomputer 11.

  As described above, when the detach grill 20 is removed from the main body 10, the microcomputer 11 that receives power supply through the two supply paths stores the current state data and user setting data stored in the RAM in the nonvolatile memory. Thereafter, the switch 17 is turned off. As a result, the power supply of the first power supply unit 13 and the second power supply unit 14 is cut off, so that the current consumption of the microcomputer 11 becomes zero. The fact that the detaching grill 20 has been removed means that the in-vehicle electronic device 1 does not need to operate in accordance with its application, so that the microcomputer 11 is in-vehicle even if the vehicle engine is not stopped. There is no need to control the electronic device 1.

  When the detach grill 20 is attached to the main body 10, since the power is supplied from the second power supply unit 14 to the microcomputer 11, the microcomputer 11 is automatically activated. At this time, the microcomputer 11 turns on the switch 17 in preparation for the subsequent detachment grill 20 removal.

  When the ACC power supply 3 is turned off, the microcomputer 11 stores the current state data and user setting data stored in the RAM in a nonvolatile memory, and then turns off the switch 17 to turn off the first power supply unit 13. Shut off the power supply. Thereafter, when the detach grill 20 is removed from the main body 10, the power supply of the second power supply unit 14 is also cut off, so that the current consumption of the microcomputer 11 becomes zero.

  Furthermore, the microcomputer 11 switches its operation mode depending on the state of the ACC power supply 3. Specifically, the microcomputer 11 operates in the microcomputer normal consumption current mode when the ACC power supply 3 is ON, and operates in the microcomputer low consumption current mode when the ACC power supply 3 is OFF. The microcomputer normal current consumption mode is an operation mode for performing operation control of the mechanical unit and the like. The microcomputer low consumption current mode is a standby operation mode in which the operation control of the mechanical unit is not performed. In this mode, the microcomputer 11 operates at a current lower than that in the microcomputer normal consumption current mode.

[2. Operation of in-vehicle electronic device 1]
Next, the operation of the in-vehicle electronic device 1 according to this embodiment will be described.

  FIG. 2 is a flowchart showing a processing example by the microcomputer 11 of the in-vehicle electronic device 1 according to the present embodiment.

  The process shown in FIG. 2 is started after the BU power source 2 is turned on, for example, by connecting a plug to the BU power source 2. First, when the detach grill 20 is mounted on the main body 10 (step S1), the terminal 18a and the terminal 22a come into contact with each other, and the terminal 18b and the terminal 22b come into contact with each other. Is supplied (step S2). The microcomputer 11 is activated by this power supply, and the microcomputer 11 sets the operation mode to the microcomputer low current consumption mode.

  Next, the microcomputer 11 determines whether or not the ACC power supply 3 is detected by the ACC detection circuit 16 (step S3). At this time, the microcomputer 11 repeats the determination when the ACC power source 3 is turned on (step S3: NO) (step S3), and when the ACC power source 3 is detected ON (step S3). (S3: YES), the switch 17 is turned on, and the operation mode is shifted to the microcomputer normal current consumption mode (step S4). At this time, the microcomputer 11 reads the current state data and the user setting data from the nonvolatile memory 12 and stores them in the RAM, and starts controlling the operation of the mechanical unit and the like based on these data. In the microcomputer normal current consumption mode, the microcomputer 11 updates the user setting data stored in the RAM in accordance with the operation of the operation unit 21 by the user. Further, the microcomputer 11 controls the operation of the mechanical unit and updates the current state data stored in the RAM according to the operation state.

  Next, the microcomputer 11 determines whether removal of the detached grill 20 from the main body 10 is detected by the grill attachment / detachment detection circuit 15 (step S5). At this time, if removal of the detach grill 20 is detected (step S5: YES), the microcomputer 11 stores the current state data and user setting data stored in the RAM in the nonvolatile memory 12 (step S6). ), The switch 17 is turned OFF to cut off the power supply from the first power supply unit 13 (step S7). As a result, the supply current to the microcomputer 11 becomes zero, and the operation of the microcomputer 11 is completely stopped. Thereafter, when the detach grill 20 is mounted on the main body 10, the process proceeds to step S1.

  On the other hand, when removal of the detach grill 20 is not detected (step S5: NO), the microcomputer 11 determines whether or not the ACC power supply 3 is detected by the ACC detection circuit 16 (step S8). At this time, when the microcomputer 11 does not detect the OFF of the ACC power supply 3 (step S8: NO), the microcomputer 11 proceeds to step S5.

  On the other hand, when it is detected that the ACC power supply 3 is turned off (step S8: YES), the microcomputer 11 stores the current state data and user setting data stored in the RAM in the nonvolatile memory 12 (step S9). Then, the switch 17 is turned OFF to cut off the power supply from the first power supply unit 13, and the operation mode is shifted to the low current consumption mode (step S10).

  Thereafter, when the detachment grill 20 is removed from the main body (step S11), the terminal 18a and the terminal 22a are not in contact with each other, and the terminal 18b and the terminal 22b are in contact with each other. Supply is interrupted and the supply current to the microcomputer 11 becomes zero (step S12). Thereafter, when the detach grill 20 is mounted on the main body 10, the process proceeds to step S1.

  As described above, according to the present embodiment, the in-vehicle electronic device 1 includes the main body 10 and the detach grill 20 that is detachably attached to the main body 10, and the main body 10 includes the electronic device. A microcomputer 11 that controls the operation of the power supply, a first power supply unit 13 and a second power supply unit 14 that supply power from the BU power supply 2 to the microcomputer 11, and a grill attachment / detachment detection that detects the removal of the detached grille 20 from the main body 10. The detachment grill 20 includes a circuit 15 and a switch 17. The detachment grill 20 is supplied to supply power from the BU power supply 2 to the microcomputer 11 via the second power supply unit 14 when the detachment grill 20 is attached to the main body 10. A line 201 that constitutes a part of the path and is electrically disconnected from the supply path on the main body 10 side when the detached grill 20 is removed from the main body 10 is provided. , The microcomputer 11, when the detaching grill 20 from the main body 10 has been removed is detected, cuts off the power supply from the first power source unit 13 by the switch 17 to OFF.

  Accordingly, since the power supply from the BU power supply 2 to the microcomputer 11 is completely stopped by removing the detachment grill 20 and turning off the switch 17, the dark current can be reduced to zero and the detachment grill 20 is removed. Necessary processing can be performed before the switch 17 is turned off. In addition, since the power is automatically supplied to the microcomputer 11 when the detach grill 20 is attached to the main body 10, it is not necessary to receive power supply from the ACC power source 3 in order to activate the in-vehicle electronic device 1. .

  Further, when it is detected that the detaching grill 20 has been removed from the main body 10, the microcomputer 11 stores the current state data and the user setting data in the nonvolatile memory 12, and then turns off the switch 17. Information necessary for the operation of the in-vehicle electronic device 1 can be stored while making the dark current zero.

  The microcomputer 11 stores the current state data and the user setting data in the nonvolatile memory 12 when the ACC detection circuit 16 detects that the ACC power supply 3 is turned off, and then turns off the switch 17. Therefore, even when the ACC power source 3 is turned off prior to the removal of the detach grill 20, the information necessary for the operation of the in-vehicle electronic device 1 is reduced while the detach grill 20 is subsequently removed to reduce the dark current to zero. Can be stored. Further, it is not necessary to receive power supply from the ACC power source 3 in order to activate the in-vehicle electronic device 1.

  The microcomputer 11 stores the current state data and the user setting data in the nonvolatile memory 12 when the ACC detection circuit 16 detects that the ACC power supply 3 is turned off, and then turns off the switch 17. Therefore, the dark current can be made zero by storing the information necessary for the operation of the in-vehicle electronic device 1 and then removing the detachment grill 20.

  The microcomputer 11 turns on the switch 17 when the ACC detection circuit 16 detects that the ACC power supply 3 is turned on.

  Moreover, since the microcomputer 11 operates with a smaller current than when the power is supplied from the first power supply unit 13 while the power supply from the first power supply unit 13 is stopped, for example, Even when the removal of the detaching grill 20 is forgotten, power consumption can be suppressed.

  In addition, in the said embodiment, although this application was applied with respect to the electronic device mounted in a vehicle, you may apply this application with respect to the electronic device mounted in a ship or an aircraft, for example.

DESCRIPTION OF SYMBOLS 1 Automotive electronic device 2 BU power supply 3 ACC power supply 10 Main body 11 Microcomputer 12 Non-volatile memory 13 1st power supply part 14 2nd power supply part 15 Grill attachment / detachment detection circuit 16 ACC detection circuit 17 Switch 18a, 18b, 18c, 18d, 22a, 22b, 22c, 22d Terminal 20 Detach grill 21 Operation unit 101, 102, 103, 104, 105, 106, 107, 201 lines

Claims (7)

An electronic device mounted on the mobile body, comprising: a device main body; and a mounting portion provided with an operation member operated by a passenger of the mobile body and detachably mounted on the device main body. And
The device body is
Control means for controlling the operation of the electronic device;
First power supply means and second power supply means for supplying power from a battery power source mounted on the mobile body to the control means, respectively;
Detecting means for detecting removal of the mounting portion from the device body;
With
The mounting part is
A part of a supply path for supplying electric power from the battery power source to the control unit via the second power supply unit by mounting the mounting unit on the device main unit, A conductor portion that is electrically disconnected from the supply path on the device body side by removing the mounting portion;
The electronic device according to claim 1, wherein the control unit stops power supply from the first power supply unit to itself when it is detected that the mounting portion is removed from the device main body. The electronic device according to claim 1,
The device main body further includes a nonvolatile storage means capable of rewriting stored contents,
When it is detected that the mounting portion has been removed from the device main body, the control means stores at least one of information related to the control in the storage means, and then the first power supply means An electronic device characterized in that the power supply from is stopped. The electronic device according to claim 1,
The device main body further includes ACC power supply detecting means for detecting on / off of an ACC (accessory) power supply,
The control device stops the power supply from the first power supply device when it is detected that the ACC power supply is turned off. The electronic device according to claim 3,
The electronic device according to claim 1, wherein the control unit starts power supply from the first power supply unit when it is detected that the ACC power source is turned on. The electronic device according to claim 2,
The device main body further includes ACC power supply detecting means for detecting on / off of an ACC (accessory) power supply,
When the control means detects that the ACC power supply is turned off, the control means stores at least one of the information related to the control in the storage means, and then the power from the first power supply means. Electronic equipment characterized by stopping supply. The electronic device according to any one of claims 3 to 5,
The control means operates when the power supply from the first power supply means is stopped, and operates with a smaller power than when the power is supplied from the first power supply means. machine. The electronic device is mounted on the mobile body, and includes an apparatus main body and a mounting portion that is provided with an operation member operated by a passenger of the mobile body and is detachably mounted on the device main body. The device main body controls the operation of the electronic device, and the first power supply unit and the second power supply unit supply power from the battery power source mounted on the mobile body to the control unit, respectively. And a mounting path for supplying power from the battery power source to the control means via the second power supply means when the mounting section is mounted on the device main body. Power supply control executed by an electronic device that includes a conductor portion that is electrically disconnected from the supply path on the device main body side when the mounting portion is removed from the device main body A law,
A power supply control method characterized by stopping power supply from the first power supply means to the control means when the detection means detects that the mounting portion has been removed from the device main body.

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