Electronic device, power control method and storage medium storing program thereof

a technology of power control method and storage medium, which is applied in the direction of instruments, power supply for data processing, climate sustainability, etc., can solve the problems of increasing the number of detection signal lines, increasing the total power consumption of the sensors in the whole system, and increasing the i/o port of the cpu as the notification destination, so as to reduce the power consumption and achieve the effect of power control method

Inactive Publication Date: 2018-05-31
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach reduces power consumption by ensuring only required sensors are active, minimizing the number of CPU ports needed and simplifying the power control process, while maintaining detection system functionality.

Problems solved by technology

As the number of sensors in a system increases, the number of detection signal lines is also increased, thus consuming I / O ports of the CPU as the notification destination.
Also, total power consumption consumed by the sensors in the whole system is also increased.
However, even when power supply lines are configured to power only required sensors, these power supply lines further unwantedly consume I / O ports of the CPU.
However, in the power control arrangement required to power only required sensors, the CPU has to always be in an operating state.
Therefore, when the power consumption of the CPU is large, electric power which can be reduced by turning off a power source of unnecessary sensors by the power control may be canceled out.
Also, even when the power control is configured to be executed via a dedicated IC integrated circuit) or encoder / decoder in place of the CPU, the detection system is more complicated.

Method used

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  • Electronic device, power control method and storage medium storing program thereof
  • Electronic device, power control method and storage medium storing program thereof
  • Electronic device, power control method and storage medium storing program thereof

Examples

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first embodiment

[0023]FIG. 1 is a block diagram showing the arrangement of a detection system 101 which can detect movement of a detection target such as a person outside a device using a plurality of sensors. In this embodiment, a detection system 101 is mounted in an image processing apparatus represented by a printer, scanner, or MFP which integrates these plurality of functions. The image processing apparatus will also be simply referred to as an electronic device hereinafter as a device including the detection system 101. The detection system 101 includes a controller 102, three types of sensors, that is, first sensor 103, second sensor (intermediate sensor) 104, and third sensor (final sensor) 105, power source unit 106, main switch 107, and AC outlet 108. The controller 102 includes a CPU 121, a RAM 122 which is used as a temporary storage by the CPU 121, and a ROM 123 which stores various programs executed by the CPU 121. When a power source of the CPU 121 is turned on, the CPU 121 loads pr...

second embodiment

[0049]The first embodiment has explained the case in which a power source of a controller 102 is OFF in an initial state, and a CPU 121 begins to operate as a detection target comes closer to an image processing apparatus which mounts a detection system 101. However, even when the controller 102 stands by in a power saving state, the processes of FIGS. 4 and 5 are applicable. Differences from the first embodiment will be described below in association with a case in which the controller 102 stands by in the power saving state.

[0050]FIG. 7 is a block diagram showing the arrangement of the detection system 101 according to this embodiment. Unlike in FIG. 1, a power supply line from a sub power source 162 is also supplied to the CPU 121. Connection of the power supply line to the CPU 121 is indicated by a power supply line 701 in FIG. 7. In this embodiment, when the controller 102 stands by in the power saving state, electric power is supplied from a sub power source 162 via the power ...

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Abstract

In an electronic device, a first sensor detects a detection target on a first region. A second sensor detects a detection target on a second region. A third sensor detects a detection target on a third region. A power control unit turns on the second sensor in a case where the first sensor detects the detection target on the first region. The power control unit turns on the third sensor and turns off the first sensor in a case where the second sensor detects the detection target on the second region.

Description

BACKGROUND OF THE INVENTIONField of the Invention[0001]The present invention relates to an electronic device having a plurality of sensors used to detect movement of an external detection target, a power control method, and a storage medium storing a program thereof.Description of the Related Art[0002]A detection system which detects a change in sensing target as a time series using a plurality of sensors is known. For example, two infrared sensors which detect the presence of a heat source such as a person are prepared at points A and B, and detection times of the sensors at the points A and B are overlaid to detect movement of a person as a detection target from the point A to the point B. In this arrangement, as the number and types of sensors are increased, detection can be made at higher precision.[0003]Japanese Patent Laid-Open No. 2012-087962 describes an arrangement which combines a sensor which can detect a broad range at a low resolution, and a sensor which can detect a na...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): G06F1/32
CPCG06F1/3287G06F1/3231Y02D10/171Y02D10/173G06F1/325Y02D10/00
InventorASANO, KOHEI
OwnerCANON KK