JP2007133804A - Power supply control device and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem in which power consumption tends to increase due to a larger screen and higher luminance of a monitor, higher speed of a CPU or the like even in a portable terminal with power supply by a battery. <P>SOLUTION: In this power supply control means, a device state monitoring means 3 monitors the state of a first device 1, and a power saving management means 6 determines the necessity of a second device 2 from change in the state and manages and controls a power supply change means 4 so as to stop power supply to an unnecessary device, whereby stable supply of power can be attained during battery drive. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention monitors the operation status of the first device, determines the necessity of the second device from the change in the operation status, and stops the power supply to unnecessary devices, thereby driving the battery. The present invention relates to a power supply control device that realizes stable power supply.

  Conventionally, in a battery-powered product, various technologies have been devised for realizing power saving by executing a power saving function when it is detected that a specific device is not in operation.

 For example, a technique for reducing the brightness and brightness of a display screen when an input device such as a keyboard or a button is left for a certain period is widely known.

  In addition, when a device has been in a non-operating state for a certain period of time or longer, the wireless communication device is switched to a wireless communication device having different power consumption or communication speed depending on a technique (see Patent Document 1) that cuts off power supply to the device or a power supply mode Technology (see Patent Document 2) is also known.

Further, a technique for changing the operating frequency of the CPU according to the remaining battery level or the elapsed time of the standby state (see Patent Document 3), or a device forcibly when a voltage exceeding a specified level cannot be secured within a predetermined time when the power is turned on. A technique (see Patent Document 4) for shutting off the power source is also known.
Japanese Patent Laid-Open No. 7-271383 JP 2004-227438 A JP 2004-56326 A Japanese Patent Laid-Open No. 10-40220

 As information processing devices have become lighter and smaller, mobile phones and PDAs (Personal Digital Assistance), as well as notebook computers, have been actively carried out as portable terminals.

  Even in a portable terminal, power consumption increases only because the same level as a terminal used indoors is required for a large monitor screen, high brightness, and high CPU speed.

  However, although the technique of Patent Document 1 is suitable for an application that realizes power saving by stopping the power supply of the entire apparatus, such as an apparatus that provides a single function such as a printer or a scanner that is a peripheral device of a host computer. In addition, it has not been possible to provide an appropriate power saving function for applications such as a computer that operates with multitasking, such as “not using a communication device but using a keyboard and monitor”.

  Further, in the technology of Patent Document 2, if a communication method of a different standard such as a wireless communication device or a device provided with an alternative means, “use a method capable of high-speed communication even when power consumption is high while operating with an AC power supply. It is suitable for applications such as switching to a method with low power consumption even when the communication speed is low while operating with a DC power supply, but “does not use the communication device itself when operating with a DC power supply” or “remaining battery power”. It was not possible to provide an appropriate power saving function for applications such as “I do not watch TV when the amount reaches 50%”.

  The technique of Patent Document 3 is suitable for applications where there is no other influence even if the operating frequency of the entire device is changed, such as when processing with a relatively low CPU load is performed, or a device that operates with a single task. However, there are cases in which high-speed processing is required and processing that is not so fast, such as computers that operate with multitasking, operate at the same time, so an appropriate power-saving function is provided for devices that operate with multitasking I couldn't.

  The present invention monitors the status of the first device, determines the necessity of the second device from the change in the status, and stops the power supply to unnecessary devices, so that the power can be supplied when the battery is driven. An object of the present invention is to provide a power supply control device that realizes a stable supply of power.

In order to solve the above problems, in the power supply control device of the present invention,
A first device whose operation status is to be monitored;
A second device whose power supply is to be stopped;
Device status monitoring means for monitoring the operating status of the first device;
Power supply changing means for changing the power supply of the second device;
The status of the first device monitored by the device status monitoring means, the power saving management means for managing the second device whose power supply changing means stops the power supply,
Have
When the device status monitoring unit detects a predetermined state of the first device managed by the power saving management unit, the power supply changing unit stops the power supply of the second device managed by the power saving management unit. so,
By monitoring the status of the first device, determining the necessity of the second device from the change in the status, and stopping the power supply to unnecessary devices, the second device is no longer consumed. It is possible to supply power from the battery to the product body.

  The “second device” here is a general term for devices constituting the apparatus including the “first device”, and is not a specific number. The “first device” and the “second device” are the same device. It goes without saying that it may be.

Furthermore, the device status monitoring means has monitoring interval management means for managing an interval for monitoring the status of the first device,
By changing the interval at which the device status monitoring means monitors the status of the first device according to the remaining battery ratio,
The total amount of power consumed to monitor the status of the first device can be reduced.

Furthermore, it has information transmission means that transmits information by text, voice, or video,
When the device state monitoring means stops power supply to the second device, by notifying the operator of the reason for stopping or the power supply start method,
The operator can be notified of the reason why the power saving function is activated and the recovery method.

Further, when the device state monitoring unit detects that the current remaining ratio with respect to the fully charged state of the battery as the first device is equal to or less than a predetermined numerical value, the power supply changing unit detects the power to the second device. By stopping the supply,
It is possible to prevent power consumption without being recognized by the operator.

Further, when the device state monitoring means detects that the power supplied from the power supply device as the first device is a DC power supply, the power supply changing means stops the power supply to the second device. ,
It is possible to supply from the battery to the product body the power that is not consumed by unnecessary devices when power is supplied from the DC power source.

Furthermore, when the device state monitoring unit detects that the communication cable is not connected to the wired communication device that is the first device, the power supply changing unit stops the power supply to the second device,
It becomes possible to supply from the battery to the product body the power that is not consumed by the wired communication device that is in an unusable state.

Furthermore, when the device state monitoring unit detects that the radio wave reception state of the wireless communication device that is the first device is in a poor state, the power supply changing unit supplies power to the wireless communication device that is the second device. By stopping
It is possible to supply from the battery to the product body the amount of power that has been consumed by the wireless communication device that is in an unusable state.

  Further, when the device state monitoring unit detects that the radio wave reception state of the video or audio receiving device which is the first device is in a poor state, the video or audio receiving device whose power supply changing unit is the second device By stopping the power supply to the power supply, it is possible to supply the power to the product body from the battery so that the video or audio receiving device in an unusable state is no longer consumed.

Further, when the device state monitoring means detects that the wireless communication device as the first device has received a radio wave of a specific frequency, the power supply changing means can perform either recording or recording as the second device. By stopping power supply to new devices,
It is possible to supply from the battery to the product body the amount of power that has been consumed by the device capable of either recording or recording in an unusable state.

  Needless to say, the “unusable state” includes “a state where use is prohibited”.

  According to the power supply control apparatus of the present invention, the status of the first device is monitored, the necessity of the second device is determined from the change in the status, and the power supply to unnecessary devices is stopped. Thus, stable power supply can be realized when the battery is driven.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a conceptual configuration diagram of a power supply control device according to a first embodiment of the present invention.

  In FIG. 1, 1 is a first device to be monitored for operation status, 2 is a second device to be stopped for power supply, 3 is device status monitoring means for monitoring the operation status of the first device, and 4 is second Power supply changing means for changing the power supply of the device, 5 is a power saving management means for managing the status of the first device monitored by the device state monitoring means, and the second device for which the power supply changing means stops power supply, 6 Is a monitoring interval management unit that manages an interval at which the device state monitoring unit monitors the status of the first device, and 7 is an information transmission unit that transmits information by text, voice, video, or the like.

  FIG. 2 is an explanatory diagram showing a power supply control apparatus that stops the power supply of the second device according to the state of the first device according to the first embodiment of the present invention.

  The battery 230 is connected to the power supply control device of FIG. 2 and has at least a power supply function by the battery.

 The power saving management unit 240 includes a power saving function number 242, a first device 243 to be monitored for operation status, a monitoring content 244, a second device 245 to be a power supply stop target, and a first device 243. There is a power saving management table 241 having an area for storing a result 246 of whether or not the condition of the monitoring content 244 is satisfied.

 The device status monitoring unit 220 monitors the operation status of the first device 243 registered up to the number N251 in the power saving management table 241. First, it is compared whether or not the remaining battery level of the battery designated by the number 247 is 50% or less. If the comparison result is “true”, “1” is set in the result 246, and 51% or more, If the comparison result is “false”, “0” is stored in the result 246. Similarly, the monitoring result is stored up to the first device 243 registered in the number N251. When all the devices have been monitored, the operation status of the first device 243 is resumed after being temporarily suspended for “1000 ms” designated by the monitoring interval 221 of the first device.

 The power supply changing unit 210 confirms the comparison result of the operation status of the first device 243 registered up to the number N251 in the power saving management table 241. First, when the comparison result of the number 247 is “1”, the second device 245 of the number 247, that is, “TV tuner” is acquired as the device 211 that stops the power supply, and the power supply 201 of the TV tuner 200 is “ If it is “ON”, it is set to “OFF” and power supply to the device is stopped. Similarly, the power supply to the “wired LAN” that is the second device of number 248 and number 249 whose comparison result is “1” is also stopped.

 Thus, by stopping the power supply to the second device according to the operation status of the first device that is the monitoring target of the operation status, it becomes possible to utilize the power saving function customized for each owner. . Furthermore, if there is a power supply control device that restricts the device that supplies power according to the decrease in the remaining battery level, essential functions and devices are operated until the battery level is exhausted. Only the functions and devices that you want to use can be limited by the remaining battery power. This means that it is possible to avoid a problem that an indispensable function cannot be executed due to battery consumption by the device during standby. Therefore, the power supply control apparatus capable of stopping the power supply of the second device depending on the state of the first device is an effective means for improving the power saving function and convenience.

 FIG. 3 is a flowchart showing a power supply control process for stopping the power supply of the second device depending on the state of the first device according to the first embodiment of the present invention.

  When the power supply control process is started, first, as an initialization process, the total number (N) of the first devices whose operation status is monitored in P301 and the interval (T) for monitoring the operation status of the first device are set in P302. In step P303, the update counter (i) of the first device that monitors the operation status is initialized to 0, and monitoring of the operation states of the N first devices managed by the power saving management table 241 in FIG. 2 is started. To do. In P304, it is checked whether or not the operation status of the first device designated by the (i + 1) -th in the power saving management table 241 in FIG. 2 matches the condition for stopping the power supply to the second device. In this case, the power supply to the second device is stopped at P305. Then, in P306, it is checked whether or not the monitoring of the operation states of the N first devices registered in the power saving management table 241 in FIG. 2 is completed. If not, the first device is updated in P307. Counter (i) is updated and monitoring of the operating state of the first device is continued in P304. If completed, it is checked in P308 whether the power supply to all the second devices registered in the power saving management table 241 in FIG. 2 has stopped, and there is a second device that is still supplying power. In this case, after waiting for the interval (T) for monitoring the operation status in P309, the process returns to P303.

(Embodiment 2)
FIG. 4 is an explanatory diagram showing a power supply control device that changes the monitoring interval of the first device according to the remaining amount of the battery according to the second embodiment of the present invention.

  The battery 430 is connected to the power supply control device of FIG. 4 and has at least a power supply function using the battery.

 The power saving management means 440 has a power saving management table similar to FIG. 2, and the first device to be monitored, the monitoring content, and the comparison result of the monitoring content are stopped when the power supply is stopped. Two devices are managed.

 The device state monitoring unit 420 acquires the battery remaining amount 431 of the battery 430 when the monitoring process of the operation statuses of all the first devices managed by the power saving management table of the power saving management unit 440 is completed.

 The monitoring interval management means 450 includes a monitoring interval management table 451 having areas for storing a number 452, a remaining battery level 453, and a monitoring interval 454. Here, when the remaining battery capacity 431 of the battery 430 is 80%, the corresponding number in the corresponding monitoring interval management table 451 is the number 455, and is temporarily suspended for “3000 ms” stored in the monitoring interval 421 of the first device. After that, the monitoring of the operation status of the first device is resumed.

 Usually, there are many cases where a load (increasing power consumption) is applied to the CPU to acquire the device status. Thus, there is a power supply control device that can change the device monitoring interval in accordance with the remaining battery level. As a result, the ratio of the power consumption at the time of acquiring the device status to the remaining battery level can be made constant.

 This means that the power consumption speed associated with device status acquisition can be made constant, and the total power consumed for device status acquisition can be reduced. Therefore, the power supply control device that can change the monitoring interval of the first device in accordance with the remaining amount of the battery is an effective means for improving the power saving function and convenience.

 In the second embodiment, the monitoring interval management unit 450 acquires the monitoring interval by the monitoring interval management table 451 including the remaining battery level 453 and the monitoring interval 454. However, “monitoring interval = 1000 ms / (remaining battery amount (% ) / 100) ". That is, the monitoring interval 454 is determined so as to be inversely proportional to the remaining battery level.

  FIG. 5 is a flowchart showing a power supply control process for changing the monitoring interval of the first device according to the remaining amount of the battery according to the second embodiment of the present invention.

  When the power supply control process is started, first, as an initialization process, the total number (N) of the first devices whose operation status is monitored in P501 and the interval (T) for monitoring the operation status of the first device are set in P502. In step P503, the update counter (i) of the first device that monitors the operation status is initialized to 0, and monitoring of the operation states of the N first devices managed by the power saving management table 241 in FIG. 2 is started. To do. In P504, it is checked whether or not the operation status of the first device designated by the (i + 1) -th in the power saving management table 241 in FIG. 2 matches the condition for stopping the power supply to the second device. In this case, the power supply to the second device is stopped at P505. Then, in P506, it is checked whether or not the monitoring of the operation states of the N first devices registered in the power saving management table 241 in FIG. 2 is completed. If not, the update of the first device is performed in P507. Counter (i) is updated and monitoring of the operating state of the first device is continued in P504. If completed, it is checked in P508 whether the power supply to all the second devices registered in the power saving management table 241 in FIG. 2 is stopped, and there is a second device that is still supplying power. In this case, the remaining battery level (%) of the battery connected in P510 is acquired. In P511, the monitoring interval (T) of the operation status corresponding to the remaining battery level is acquired with reference to the monitoring interval management table 451 in FIG. Then, it is checked whether or not the monitoring interval (T) acquired in P512 is 0. If not, after waiting for the interval (T) for monitoring the operation status in P509, the process returns to P503.

(Embodiment 3)
FIG. 6 is an explanatory diagram showing a power supply control device that notifies the operator of the reason for stopping or the power supply start method when the power supply is stopped according to the third embodiment of the present invention.

  A battery 630 is connected to the power supply control apparatus of FIG. 6 and has at least a power supply function using the battery.

 The power saving management means 640 has a power saving management table similar to FIG. 2, and the first device to be monitored, the monitoring content, and the comparison result of the monitoring content is “true” and the power supply is stopped. Two devices are managed.

 The device state monitoring unit 620 monitors the operation status of all the first devices managed by the power saving management table of the power saving management unit 640.

 The information transmission unit 650 outputs a message to the operator when the power supply changing unit 610 stops the power supply of the device. The information transmission unit 650 includes a message management table 651 including a number 652, a first device 653 to be monitored for operation status, a device status 654, and a second device 655 to stop power supply. Further, it has a message creation table 656 including a message number 657, a message format 658, and an output message 659. The message number 657 is acquired from the device 611 that stops the power supply managed by the power supply changing unit 610, and the corresponding number 660 of the message management table 651 is determined.

 The “first device”, “device status”, and “second device” in the message of the message format 658 are replaced with the corresponding first device 653, device status 654, and second device 655 in the message management table 651. The output message 659 is output.

 Thus, when the power supply to the device is automatically stopped, if there is a power supply control device that notifies the operator of the reason for stopping or the power supply start method, the operator can recognize the current device state. Is possible. This means that when the operator uses a device that is in the power stop state, the time required to return to the usable state can be shortened. Therefore, the power supply control device that can notify the operator of the reason for stopping or the method of starting power supply when the power supply is stopped is an effective means for improving the power saving function and convenience.

 FIG. 7 is a flowchart showing a power supply control process for notifying the operator of the reason for stopping or the power supply starting method when the power supply is stopped according to the third embodiment of the present invention.

  When the power supply control process is started, first, as an initialization process, the total number (N) of first devices whose operation status is monitored in P701 and the interval (T) for monitoring the operation status of the first device are set in P702. Then, in P703, the update counter (i) of the first device that monitors the operation status is initialized to 0, and monitoring of the operation states of the N first devices managed by the power saving management table 241 in FIG. 2 is started. To do. In P704, it is checked whether or not the operation status of the first device designated by the (i + 1) -th in the power saving management table 241 in FIG. 2 matches the condition for stopping the power supply to the second device. In this case, the name “device 1” of the first device designated by the (i + 1) -th in the message management table 651 in FIG. 6 is acquired in P705. Then, the condition “device status” for stopping power supply is acquired in P706, and the name “device 2” of the second device whose power supply is stopped is acquired in P707. Then, a message is created by substituting the data acquired in P705, P706, and P707 into the message template in P708, and output in P709. In step P710, power supply to the second device is stopped. Thereafter, in P711, it is checked whether or not the monitoring of the operation states of the N first devices registered in the power saving management table 241 in FIG. 2 is completed. If not, the first device is updated in P712. Counter (i) is updated and monitoring of the operating state of the first device is continued in P704. If completed, it is checked in P713 if the power supply to all the second devices registered in the power saving management table 241 in FIG. 2 is stopped, and there is a second device that is still supplying power. In this case, after waiting for the interval (T) for monitoring the operation status in P714, the process returns to P703.

  The power supply control apparatus according to the present invention monitors the status of the first device, determines the necessity of the second device from the change in the status, and stops the power supply to unnecessary devices. Thus, it is possible to realize a stable power supply when the battery is driven without degrading the performance and operability, and it is useful for a portable notebook computer or the like that is assumed to be used by battery driving.

The conceptual block diagram of the electric power supply control apparatus which concerns on the 1st Embodiment of this invention Explanatory drawing which shows the electric power supply control apparatus which stops the electric power supply of a 2nd device according to the condition of the 1st device which concerns on the 1st Embodiment of this invention. The flowchart which shows the electric power supply control process which stops the electric power supply of a 2nd device with the condition of the 1st device which concerns on the 1st Embodiment of this invention. Explanatory drawing which shows the electric power supply control apparatus which changes the monitoring interval of a 1st device according to the battery residual amount which concerns on 2nd Embodiment. The flowchart which shows the electric power supply control process which changes the monitoring interval of a 1st device according to the residual amount of the battery which concerns on 2nd Embodiment. Explanatory drawing which shows the electric power supply control apparatus which notifies an operator of the stop reason or the electric power supply start method at the time of the electric power supply stop concerning the 3rd Embodiment of this invention The flowchart which shows the electric power supply control process which notifies an operator the stop reason or the electric power supply start method at the time of the electric power supply stop concerning the 3rd Embodiment of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st device 2 2nd device 3 Device state monitoring means 4 Power supply change means 5 Power saving management means 6 Monitoring interval management means 7 Information transmission means

Claims (24)

A first device whose operation status is to be monitored;
A second device whose power supply is to be stopped;
Device status monitoring means for monitoring the operating status of the first device;
Power supply changing means for changing the power supply of the second device;
The status of the first device monitored by the device status monitoring means, and the power saving management means for managing the second device whose power supply changing means stops power supply;
Have
When the device status monitoring unit detects a predetermined status of the first device managed by the power saving management unit, the power supply changing unit manages the second device managed by the power saving management unit. A power supply control device characterized by stopping power supply. The device status monitoring means includes monitoring interval management means for managing an interval for monitoring the status of the first device;
2. The power supply control apparatus according to claim 1, wherein an interval for monitoring a status of the first device is changed according to a remaining capacity ratio of a battery which is the first device acquired by the device status monitoring unit. . When the remaining capacity ratio of the battery that is the first device acquired by the device state monitoring unit is smaller than the previously acquired numerical value, the interval for monitoring the status of the first device is changed to be greater than or equal to the previously changed numerical value. The power supply control device according to claim 2. When the remaining capacity ratio of the battery that is the first device acquired by the device state monitoring unit is larger than the previously acquired numerical value, the interval for monitoring the status of the first device is changed to a value that has been changed last time or less. The power supply control device according to claim 2. It has information transmission means to transmit information by text, voice or video,
5. The power supply control device according to claim 1, wherein when the device state monitoring unit stops power supply to the second device, the device status monitoring unit notifies the operator of the reason for the stop or the power supply start method. . When the device state monitoring means detects that the current remaining ratio with respect to the fully charged state of the battery that is the first device has become a predetermined numerical value or less, the power supply changing means sends the second device to the second device. The power supply control device according to claim 1, wherein the power supply is stopped. When the device state monitoring unit detects that the power supplied from the power supply apparatus as the first device is a DC power source, the power supply changing unit stops the power supply to the second device. The power supply control device according to claim 1. When the device state monitoring unit detects that a communication cable is not connected to the wired communication device that is the first device, the power supply changing unit stops the power supply to the second device. The power supply control device according to claim 1, wherein the power supply control device is a power supply control device. The power supply control apparatus according to claim 1, wherein the second device is a wired communication device. When the device state monitoring unit detects that the radio wave reception state of the wireless communication device that is the first device is in a poor state, the power supply changing unit sends the wireless communication device that is the second device to the wireless communication device. The power supply control device according to claim 1, wherein the power supply is stopped. When the device state monitoring unit detects that the radio wave reception state of the video or audio receiving device that is the first device is in a poor state, the video or audio that the power supply changing unit is the second device The power supply control apparatus according to claim 1, wherein power supply to the output device is stopped. When the device state monitoring means detects that the wireless communication device that is the first device has received a radio wave of a specific frequency, the power supply changing means sends the recording or recording device that is the second device to the recording or recording device. The power supply control device according to claim 1, wherein the power supply is stopped. A power supply control method for a power supply control device including a first device to be monitored for operation status and a second device to be stopped for power supply,
A device status monitoring procedure for monitoring the operating status of the first device;
A power supply change procedure for changing the power supply of the second device;
A status of the first device monitored by the device status monitoring procedure; a power saving management procedure for managing the second device whose power supply change procedure stops power supply;
Have
When the device status monitoring procedure detects a predetermined status of the first device managed by the power saving management procedure, the power supply change procedure of the second device managed by the power saving management procedure is detected. A power supply control method for a power supply control device, characterized by stopping power supply. The device status monitoring procedure includes a monitoring interval management procedure for managing an interval for monitoring the status of the first device;
The power supply control device according to claim 13, wherein an interval for monitoring a status of the first device is changed according to a remaining capacity ratio of a battery that is the first device acquired by the device status monitoring procedure. Power supply control method. When the remaining capacity ratio of the battery that is the first device acquired by the device status monitoring procedure is smaller than the previously acquired numerical value, the interval for monitoring the status of the first device is changed to be greater than or equal to the previously changed numerical value. The power supply control method of the power supply control device according to claim 14. When the remaining capacity ratio of the battery, which is the first device acquired by the device status monitoring procedure, is larger than the previously acquired numerical value, the interval for monitoring the status of the first device is changed to the previously changed numerical value or less. The power supply control method of the power supply control device according to claim 14. Has an information transmission procedure to transmit information by text, voice, or video,
17. The power supply control device according to claim 13, wherein when the device state monitoring procedure stops power supply to the second device, the operator is notified of the reason for the stop or the power supply start method. Power supply control method. When the device state monitoring procedure detects that the current remaining ratio with respect to the fully charged state of the battery as the first device has become a predetermined numerical value or less, the power supply change procedure is sent to the second device. The power supply control method of the power supply control device according to claim 13, wherein the power supply is stopped. When the device state monitoring procedure detects that the power supplied from the power supply apparatus as the first device is a DC power supply, the power supply change procedure stops the power supply to the second device. The power supply control method of the power supply control device according to claim 13, wherein the power supply control method is a power supply control method. When the device status monitoring procedure detects that a communication cable is not connected to the wired communication device that is the first device, the power supply change procedure stops power supply to the second device. The power supply control method of the power supply control device according to claim 13, wherein the power supply control device is a power supply control method. 21. The power supply control method of the power supply control device according to claim 13, wherein the second device is a wired communication device. When the device status monitoring procedure detects that the radio wave reception state of the wireless communication device that is the first device is in a poor state, the power supply change procedure is sent to the wireless communication device that is the second device. The power supply control method of the power supply control device according to claim 13, wherein the power supply is stopped. When the device state monitoring procedure detects that the radio wave reception state of the video or audio receiving device that is the first device is in a poor state, the video or audio that the power supply change procedure is the second device The power supply control method of the power supply control device according to claim 13, wherein power supply to the output device is stopped. When the device status monitoring procedure detects that the wireless communication device that is the first device has received a radio wave of a specific frequency, the power supply change procedure is sent to the recording or recording device that is the second device. The power supply control method of the power supply control device according to claim 13, wherein the power supply is stopped.

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