US20050174710A1 - Electronic device and power supply control method - Google Patents

Electronic device and power supply control method Download PDF

Info

Publication number
US20050174710A1
US20050174710A1 US10/508,629 US50862904A US2005174710A1 US 20050174710 A1 US20050174710 A1 US 20050174710A1 US 50862904 A US50862904 A US 50862904A US 2005174710 A1 US2005174710 A1 US 2005174710A1
Authority
US
United States
Prior art keywords
electric power
electronic apparatus
supplied
usb
power supply
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/508,629
Inventor
Ichiro Masui
Katsunori Ogawa
Kenichi Sakai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sony Corp
Original Assignee
Sony Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sony Corp filed Critical Sony Corp
Assigned to SONY CORPORATION reassignment SONY CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SAKAI, KENICHI, OGAWA, KATSUNORI, MASUI, ICHIRO
Publication of US20050174710A1 publication Critical patent/US20050174710A1/en
Priority to US11/876,923 priority Critical patent/US7550877B2/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G06F1/32—Means for saving power
    • G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G06F1/266—Arrangements to supply power to external peripherals either directly from the computer or under computer control, e.g. supply of power through the communication port, computer controlled power-strips
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G06F1/28—Supervision thereof, e.g. detecting power-supply failure by out of limits supervision

Definitions

  • the present invention relates to electronic apparatuses and power supply controlling methods. Particularly, the present invention relates to an electronic apparatus and a power supply controlling method with which input power source is switched in accordance with a load of a device when a portable electronic device such as a digital still camera is connected to another electronic device via an external interface.
  • USB Universal Serial Bus
  • Such a portable electronic device is capable of operating by electric power supplied from another electronic device via a USB cable, without using a battery.
  • a current up to 500 mA can be supplied.
  • the power source is simply switched to electric power supplied from the USB cable, operation is not allowed when a current exceeding 500 mA is needed.
  • a backup battery e.g., a secondary battery or a capacitor
  • a consumption current supplied from the USB bus becomes greater than or equal to 500 ⁇ A, so that the USB standard is not satisfied.
  • the present invention has been made in view of the situation described above, and it aims at switching input power source efficiently in accordance with a load of a device.
  • a power supply controlling apparatus comprises first switching means for switching between first electric power of an electronic apparatus and second electric power supplied from another electronic apparatus via a cable, and supplying either the first electric power or the second electric power to a first power supply line; second switching means for switching from the first electric power to the second electric power and supplying the second electric power to a second power supply line when the second electric power is supplied from the another electronic apparatus; determining means for determining whether the second electric power supplied from the another electronic apparatus is less than or equal to a predetermined threshold value; and controlling means for controlling the first switching means based on a result of determination by the determining means.
  • the power supply controlling apparatus may be such that detecting means for detecting a connection with the another electronic apparatus is further provided, the determining means determines whether the second electric power is less than or equal to the predetermined threshold value when the detecting means has detected a connection with the another electronic apparatus, and that the controlling means controls switching of the first switching means so that the second electric power will be supplied to the first power supply line when the determining means has determined that the second electric power is less than or equal to the predetermined threshold value.
  • the power supply controlling apparatus may also be such that setting processing means for executing processing for setting that is needed for connection with the another electronic apparatus is further provided, the determining means determines whether the second electric power is less than or equal to the predetermined threshold value when the setting processing means is finished, and that the controlling means controls switching of the first switching means so that the second electric power will be supplied to the first power supply line when the determining means has determined that the second electric power is less than or equal to the threshold value.
  • the power supply controlling apparatus may further comprise charging means for charging a backup battery when the second electric power is being supplied from the another electronic apparatus via the cable.
  • the power supply controlling apparatus may be such that detecting means for detecting a suspend status of the electronic connected to the another electronic apparatus via the cable is further provided, and that when the detecting means has detected the suspend status, the charging means stops charging of the backup battery, and the controlling means controls switching of the first switching means so that the first electric power will be supplied to the first power supply line.
  • the cable may be a USB cable or an IEEE 1394 cable.
  • a power supply controlling method comprises a first switching step of switching between first electric power of an electronic apparatus and second electric power supplied from another electronic apparatus via a cable, and supplying either the first electric power or the second electric power to a first power supply line; a second switching step of switching from the first electric power to the second electric power and supplying the second electric power to a second power supply line when the second electric power is supplied from the another electronic apparatus; a determining step of determining whether the second electric power supplied from the another electronic apparatus is less than or equal to a predetermined threshold value; and a controlling step of controlling processing in the first switching step based on a result of determination by processing in the determining step.
  • switching between first electric power of an electronic apparatus and second electric power supplied from another electronic apparatus via a cable is executed and either the first electric power or the second electric power is supplied to a first power supply line.
  • switching from the first electric power to the second electric power takes place and the second electric power is supplied to a second power supply line. It is determined whether the second electric power supplied from the another electronic apparatus is less than or equal to a predetermined threshold value, and electric power supplied to the first power supply line is switched based on a result of the determination.
  • FIG. 1 is a diagram showing an example connection between a personal computer and a digital still camera according to the present invention.
  • FIG. 2 is a diagram showing example internal configurations of the personal computer and the digital still camera.
  • FIG. 3 is a flowchart for explaining a power supply process.
  • FIG. 4 is a flowchart for further explaining a power supply process before USB configuration, i.e., step S 2 in FIG. 3 .
  • FIG. 5 is a flowchart for further explaining a power supply process in an established USB connection, i.e., step S 4 in FIG. 3 .
  • FIG. 1 is a diagram showing an example connection between a personal computer and a digital still camera according to the present invention.
  • a USB port 11 of a personal computer 1 is connected to one end of a USB cable 2
  • the other end of the USB cable 2 is connected to a USB port 21 of a digital still camera 3 .
  • the personal computer 1 and the digital still camera 3 are USB-connected to each other.
  • the personal computer 1 is either connected to a power source that is not shown and operates by a power supply voltage thereof, or operates by electric power of a battery that is not shown. Furthermore, the personal computer 1 supplies electric power to the digital still camera 3 through the USB cable 2 .
  • the digital still camera 3 operates by electric power of a battery 41 ( FIG. 2 ), and also operates by electric power that is supplied from the personal computer 1 through the USB cable 2 .
  • FIG. 2 is a diagram showing example internal configurations of the personal computer 1 and the digital still camera 3 . Note that the figure only shows components relating to power supply.
  • the personal computer 1 includes a power supply controller 31 , a USB host controller 32 , and the USB port 11 .
  • the personal computer 1 also includes a central processing unit (CPU) for executing various processing, a read only memory (RAM) for storing programs for executing various processing, a random access memory (RAM) for storing data needed for executing various processing, input devices such as a keyboard and a mouse, a display implemented by a cathode-ray tube (CRT) display or a liquid crystal display (LCD), a speaker, a hard disk drive, and so forth.
  • CPU central processing unit
  • RAM read only memory
  • RAM random access memory
  • the power supply controller 31 based on a power supply voltage supplied from a power source that is not shown, exercises control to supply electric power to the components of the personal computer 1 , and exercises control to supply electric power to the USB host controller 32 , the USB port 11 , and the digital still camera 3 connected via the USB cable 2 .
  • the USB host controller 32 exercises connection control (configuration) for the digital still camera 3 connected via the USB port 11 and the USB cable 2 so that electric power will be supplied from the power supply controller 31 to the digital still camera 3 .
  • the digital still camera 3 includes a USB port 21 , a battery 41 , switches 42 and 45 , regulators 43 , 46 , 47 , and 53 , a CPU 44 , a USB clock 48 , a USB device controller 49 , a power controller 50 , a real-time clock (RTC) 51 , an interrupt controller (INTC: Interrupt Clock) 52 , and a backup battery 54 .
  • the digital still camera 3 also includes a camera signal processor that executes predetermined processing on captured images of objects, and an LCD that displays captured images.
  • a terminal a of the switch 42 receives electric power through the USB cable 2 , and a terminal b thereof receives electric power from the battery 41 .
  • the switch 42 under the control of the power controller 50 , is switched to the terminal a when electric power from the USB cable 2 is to be supplied to a power supply line 1 , and is switched to the terminal b when electric power from the battery 41 is to be supplied to the power supply line 1 .
  • a terminal a of the switch 45 receives electric power from the USB cable 2
  • a terminal b thereof receives electric power from the battery 41 .
  • the switch 45 upon detecting a USB connection (i.e., when a current is detected due to connection with the USB cable 2 ), is forcibly switched to the terminal a so that electric power from the USB cable 2 will be supplied to a power supply line 2 .
  • the switch 45 is switched to a terminal B so that electric power from the battery 41 will be supplied to the power supply line 2 .
  • the regulator 43 under the control of the power controller 50 , converts the power supply voltage supplied via the switch 42 from the USB cable 2 or the battery 41 into a voltage of a constant level needed by the CPU 44 , and supplies the voltage to the CPU 44 through one or more output lines (three lines in this example). Thus, the CPU 44 is allowed to operate by the electric power supplied from the regulator 43 .
  • the regulator 46 converts the power supply voltage supplied via the switch 45 from the USB cable 2 or the battery 41 into a voltage of a constant level needed by the power controller 50 , the real-time clock 51 , and the interrupt controller 52 , and supplies the voltage to each of these components.
  • the power controller 50 , the real-time clock 51 , and the interrupt controller 52 are allowed to operate by the electric power supplied from the regulator 46 .
  • the regulator 46 also supplies the voltage of the constant level obtained by the conversion to the regulator 47 and the regulator 53 .
  • the regulator 47 under the control of the power controller 50 , converts the voltage supplied from the regulator 46 into a voltage of a constant level needed by the USB device controller 49 , and supplies the voltage to the USB device controller 49 and to the USB clock 48 .
  • the USB clock 48 and the USB device controller 49 are allowed to operate by the electric power supplied from the regulator 47 .
  • the regulator 53 under the control of the power controller 50 , converts the voltage supplied from the regulator 46 into a voltage of a constant level needed by the backup battery 54 , and supplies the voltage to the backup battery 54 .
  • the USB device controller 49 operates by a voltage supplied from the regulator 47 , and exercises connection control (configuration) on the personal computer 1 connected via the USB port 21 and the USB cable 2 .
  • Configuration refers to, for example, loading configuration data that defines setting information (logic functions or wire connections) for USB connection.
  • the power controller 50 operates by a voltage supplied from the regulator 46 .
  • the power controller 50 monitors power consumption of the CPU 44 based on the operation status of the CPU 44 (e.g., ON/OFF of 3 V circuitry, ON/OFF of 5V circuitry, and ON/OFF of the power of the LCD).
  • the power controller 50 exercises control so that the switch 42 will be switched to the terminal a when the current supplied from the USB cable 2 is less than or equal to 500 mA and so that the switch 42 will be switched to the terminal b when the current supplied from the USB cable 2 is greater than 500 mA.
  • the power controller 50 monitors power consumption based on the operation status of the CPU 44 .
  • the power controller 50 exercises control so that the switch 42 will be switched to the terminal a when the current supplied from the USB cable 2 is less than or equal to 100 mA and controls the regulator 43 so that the current supplied from the USB cable 2 will not exceed 100 mA when the switch 42 is switched. Under this situation, the USB device controller 49 executes configuration.
  • the switch 42 is kept switched to the terminal b even if a current is being supplied from the USB cable 2 .
  • the power controller 50 exercises control so that the switch 42 will be switched to the terminal b and so that the regulator 53 will stop output to the backup battery 54 .
  • the power controller 50 controls the respective operations of the CPU 44 , the regulator 47 , the USB clock 48 , and other parts.
  • the backup battery 54 is implemented by a device that is included in the digital still camera 3 and that allows charging and discharging, such as a secondary battery or a capacitor, the device allowing execution of basic functions of the digital still camera 3 (e.g., internal clock and memory) when the digital still camera 3 is detached from a power source such as the battery 41 .
  • the backup battery 54 is charged by a voltage that is supplied from the regulator 53 .
  • step S 1 the power controller 50 determines (detects) whether a USB connection with the personal computer 1 via the USB port 21 and the USB cable 2 is established, and waits until a USB connection is established.
  • step S 1 When it is determined in step S 1 that a USB connection is established, the process proceeds to step S 2 , in which a power supply process before USB configuration is executed.
  • step S 11 the power controller 50 monitors power consumption based on the operation status of the CPU 44 , and determines whether the current supplied from the USB cable 2 is less than or equal to 100 mA. If it is determined that the current supplied from the USB cable 2 exceeds 100 mA, the process proceeds to step S 14 .
  • step S 14 the power controller 50 exercises control so that the switch 42 will be kept switched to the terminal b. Then, the process returns to step S 11 , and the process described above is repeated. That is, when the current supplied from the USB cable 2 exceeds 100 mA, electric power from the battery 41 is supplied to the power supply line 1 .
  • step S 11 If it is determined in step S 11 that the current supplied from the USB cable 2 is less than or equal to 100 mA, the process proceeds to step S 12 , in which the power controller 50 exercises control so that the switch 42 will be switched to the terminal a. Thus, electric power from the USB cable 2 is supplied to the power supply line 1 .
  • step S 13 the power controller 50 controls the regulator 43 so that the current from the USB cable 2 will not exceed 100 mA when the switch 42 is switched.
  • the USB device controller 49 executes configuration with the personal computer 1 connected via the USB cable 2 . The process then returns to step S 3 shown in FIG. 3 .
  • step S 3 the USB device controller 49 determines whether configuration is completed. If it is determined that configuration is not completed, the process returns to step S 2 , and the processing described above is repeated.
  • step S 3 If it is determined in step S 3 that configuration is completed, the process proceeds to step S 4 , in which a power supply process in an established USB connection is executed.
  • step S 21 the power controller 50 monitors power consumption based on the operation status of the CPU 44 , and determines whether the current supplied from the USB cable 2 is less than or equal to 500 mA. If it is determined that the current supplied from the USB cable 2 is less than or equal to 500 mA, the process proceeds to step S 22 .
  • step S 22 the power controller 50 exercises control so that the switch 42 will be switched to the terminal a.
  • electric power from the USB cable 2 is supplied to the power supply line 1 .
  • step S 21 If it is determined in step S 21 that the current supplied from the USB cable 2 exceeds 500 mA, the process proceeds to step S 23 , in which the power controller 50 exercises control so that the switch 42 will be switched to the terminal b. Thus, electric power from the battery 41 is supplied to the power supply line 1 .
  • step S 22 or step S 23 Upon completion of processing in step S 22 or step S 23 , the process returns to step S 5 shown in FIG. 3 .
  • step S 5 the power controller 50 determines whether the USB connection is disconnected. If it is determined that the USB connection is disconnected, the process returns to step S 1 , and the subsequent processing described above is repeated.
  • step S 5 If it is determined in step S 5 that the USB connection is not disconnected, i.e., when it is determined that the USB connection is maintained, the process proceeds to step S 6 .
  • step S 6 the power controller 50 determines whether USB suspend has been entered. If it is determined that USB suspend has not been entered, the process returns to step S 4 , and the subsequent processing described above is repeated.
  • step S 6 If it is determined in step S 6 that USB suspend has been entered, the process proceeds to step S 7 , in which the power controller 50 exercises control so that the switch 42 will be switched to the terminal b and so that the regulator 53 will stop output to the backup battery 54 .
  • the power controller 50 exercises control so that the switch 42 will be switched to the terminal b and so that the regulator 53 will stop output to the backup battery 54 .
  • electric power from the battery 41 is supplied to the power supply line 1 , and the charging of the backup battery 54 is stopped. Accordingly, the current supplied from the USB bus is maintained to be less than or equal to 500 ⁇ A.
  • step SB the power controller 50 determines whether the device has returned from USB suspend. If it is determined that the device has not returned from USB suspend, the process returns to step S 7 , and the processing described above is repeated.
  • step S 8 If it is determined in step S 8 that the device has returned from USB suspend, the process returns to step S 4 , and the subsequent processing described above is repeated. That is, the power supply process in an established USB connection, described with reference to FIG. 5 , is executed again.
  • the power controller 50 of the digital still camera 3 switches input power source in accordance with a load of the device, so that electric power from the USB bus is used efficiently and the load of the battery 41 is reduced.
  • USB suspend charging of the backup battery 54 is stopped, so that wasteful power consumption is minimized.
  • the blocks that are at least needed for the operation of the device are allowed to operate by electric power supplied from the USB bus. This reduces the load of the battery 41 in an established USB connection.
  • the present invention can be applied widely to information processing apparatuses that are capable of supplying electric power to electronic devices supporting USB and that include the USB host controller 32 , as well as the personal computer 1 . Also, the present invention can be applied widely to portable electronic devices supporting USB, such as camcorders and personal digital assistants (PDAs), as well as the digital still camera 3 .
  • portable electronic devices supporting USB such as camcorders and personal digital assistants (PDAs), as well as the digital still camera 3 .
  • input power source is efficiently switched in an established USB connection, without limitation to USB, for example, when a connection with an IEEE 1394 (Institute of Electrical and Electronic Engineers) bus is established, it is possible to switch input power source efficiently in accordance with the standard. In that case, input power source is switched according to whether the current supplied through the IEEE 1394 bus exceeds 1.5 A.
  • IEEE 1394 Institute of Electrical and Electronic Engineers
  • input power source is switched efficiently according to a load of a device.

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Power Sources (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Studio Devices (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

The present invention relates to an electronic apparatus and a power supply controlling method with which input power source is switched efficiently in accordance with a load of a device. A power controller 50, upon detecting a USB connection, monitors power consumption of a CPU 44 based on the operation status of the CPU 44, and controls a switch 42 in accordance with a current supplied from a USB cable 2. When the current is less than or equal to 500 mA, the switch 42 is switched to a terminal a. Before configuration, when the current is less than or equal to 100 mA, the switch 42 is switched to the terminal a, and then a regulator 43 is controlled so that the current will not exceed 100 mA. In USB suspend, the switch 42 is switched to a terminal b, and a regulator 53 stops output to a backup battery 54. The present invention can be applied to a digital still camera supporting USB.

Description

    TECHNICAL FIELD
  • The present invention relates to electronic apparatuses and power supply controlling methods. Particularly, the present invention relates to an electronic apparatus and a power supply controlling method with which input power source is switched in accordance with a load of a device when a portable electronic device such as a digital still camera is connected to another electronic device via an external interface.
    • BACKGROUND ART
  • Recently, battery-operated portable electronic devices having USB (Universal Serial Bus) interfaces, such as digital still cameras, are becoming common. Such devices can be connected to other electronic devices via USB cables.
  • Such a portable electronic device is capable of operating by electric power supplied from another electronic device via a USB cable, without using a battery.
  • According to the USB standard, a current up to 500 mA can be supplied. However, when a portable electronic device is connected to another electronic device via a USB cable, if the power source is simply switched to electric power supplied from the USB cable, operation is not allowed when a current exceeding 500 mA is needed.
  • Furthermore, in a portable electronic device, when a backup battery (e.g., a secondary battery or a capacitor) is charged during USB suspend, a consumption current supplied from the USB bus becomes greater than or equal to 500 μA, so that the USB standard is not satisfied.
  • That is, when the current exceeds the value defined by the USB standard, error could occur in signal processing or the like.
    • DISCLOSURE OF INVENTION
  • The present invention has been made in view of the situation described above, and it aims at switching input power source efficiently in accordance with a load of a device.
  • A power supply controlling apparatus according to the present invention comprises first switching means for switching between first electric power of an electronic apparatus and second electric power supplied from another electronic apparatus via a cable, and supplying either the first electric power or the second electric power to a first power supply line; second switching means for switching from the first electric power to the second electric power and supplying the second electric power to a second power supply line when the second electric power is supplied from the another electronic apparatus; determining means for determining whether the second electric power supplied from the another electronic apparatus is less than or equal to a predetermined threshold value; and controlling means for controlling the first switching means based on a result of determination by the determining means.
  • The power supply controlling apparatus may be such that detecting means for detecting a connection with the another electronic apparatus is further provided, the determining means determines whether the second electric power is less than or equal to the predetermined threshold value when the detecting means has detected a connection with the another electronic apparatus, and that the controlling means controls switching of the first switching means so that the second electric power will be supplied to the first power supply line when the determining means has determined that the second electric power is less than or equal to the predetermined threshold value.
  • The power supply controlling apparatus may also be such that setting processing means for executing processing for setting that is needed for connection with the another electronic apparatus is further provided, the determining means determines whether the second electric power is less than or equal to the predetermined threshold value when the setting processing means is finished, and that the controlling means controls switching of the first switching means so that the second electric power will be supplied to the first power supply line when the determining means has determined that the second electric power is less than or equal to the threshold value.
  • The power supply controlling apparatus may further comprise charging means for charging a backup battery when the second electric power is being supplied from the another electronic apparatus via the cable.
  • The power supply controlling apparatus may be such that detecting means for detecting a suspend status of the electronic connected to the another electronic apparatus via the cable is further provided, and that when the detecting means has detected the suspend status, the charging means stops charging of the backup battery, and the controlling means controls switching of the first switching means so that the first electric power will be supplied to the first power supply line.
  • The cable may be a USB cable or an IEEE 1394 cable.
  • A power supply controlling method according to the present invention comprises a first switching step of switching between first electric power of an electronic apparatus and second electric power supplied from another electronic apparatus via a cable, and supplying either the first electric power or the second electric power to a first power supply line; a second switching step of switching from the first electric power to the second electric power and supplying the second electric power to a second power supply line when the second electric power is supplied from the another electronic apparatus; a determining step of determining whether the second electric power supplied from the another electronic apparatus is less than or equal to a predetermined threshold value; and a controlling step of controlling processing in the first switching step based on a result of determination by processing in the determining step.
  • In the electronic apparatus or the power supply controlling method according to the present invention, switching between first electric power of an electronic apparatus and second electric power supplied from another electronic apparatus via a cable is executed and either the first electric power or the second electric power is supplied to a first power supply line. When the second electric power is supplied from the another electronic apparatus, switching from the first electric power to the second electric power takes place and the second electric power is supplied to a second power supply line. It is determined whether the second electric power supplied from the another electronic apparatus is less than or equal to a predetermined threshold value, and electric power supplied to the first power supply line is switched based on a result of the determination.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a diagram showing an example connection between a personal computer and a digital still camera according to the present invention.
  • FIG. 2 is a diagram showing example internal configurations of the personal computer and the digital still camera.
  • FIG. 3 is a flowchart for explaining a power supply process.
  • FIG. 4 is a flowchart for further explaining a power supply process before USB configuration, i.e., step S2 in FIG. 3.
  • FIG. 5 is a flowchart for further explaining a power supply process in an established USB connection, i.e., step S4 in FIG. 3.
    • BEST MODE FOR CARRYING OUT THE INVENTION
  • Now, an embodiment of the present invention will be described with reference to the drawings.
  • FIG. 1 is a diagram showing an example connection between a personal computer and a digital still camera according to the present invention. Referring to the figure, a USB port 11 of a personal computer 1 is connected to one end of a USB cable 2, and the other end of the USB cable 2 is connected to a USB port 21 of a digital still camera 3. Thus, the personal computer 1 and the digital still camera 3 are USB-connected to each other.
  • The personal computer 1 is either connected to a power source that is not shown and operates by a power supply voltage thereof, or operates by electric power of a battery that is not shown. Furthermore, the personal computer 1 supplies electric power to the digital still camera 3 through the USB cable 2.
  • The digital still camera 3 operates by electric power of a battery 41 (FIG. 2), and also operates by electric power that is supplied from the personal computer 1 through the USB cable 2.
  • FIG. 2 is a diagram showing example internal configurations of the personal computer 1 and the digital still camera 3. Note that the figure only shows components relating to power supply.
  • The personal computer 1 includes a power supply controller 31, a USB host controller 32, and the USB port 11. Although not shown, the personal computer 1 also includes a central processing unit (CPU) for executing various processing, a read only memory (RAM) for storing programs for executing various processing, a random access memory (RAM) for storing data needed for executing various processing, input devices such as a keyboard and a mouse, a display implemented by a cathode-ray tube (CRT) display or a liquid crystal display (LCD), a speaker, a hard disk drive, and so forth.
  • The power supply controller 31, based on a power supply voltage supplied from a power source that is not shown, exercises control to supply electric power to the components of the personal computer 1, and exercises control to supply electric power to the USB host controller 32, the USB port 11, and the digital still camera 3 connected via the USB cable 2.
  • The USB host controller 32 exercises connection control (configuration) for the digital still camera 3 connected via the USB port 11 and the USB cable 2 so that electric power will be supplied from the power supply controller 31 to the digital still camera 3.
  • The digital still camera 3 includes a USB port 21, a battery 41, switches 42 and 45, regulators 43, 46, 47, and 53, a CPU 44, a USB clock 48, a USB device controller 49, a power controller 50, a real-time clock (RTC) 51, an interrupt controller (INTC: Interrupt Clock) 52, and a backup battery 54. Although not shown, the digital still camera 3 also includes a camera signal processor that executes predetermined processing on captured images of objects, and an LCD that displays captured images.
  • A terminal a of the switch 42 receives electric power through the USB cable 2, and a terminal b thereof receives electric power from the battery 41. The switch 42, under the control of the power controller 50, is switched to the terminal a when electric power from the USB cable 2 is to be supplied to a power supply line 1, and is switched to the terminal b when electric power from the battery 41 is to be supplied to the power supply line 1.
  • A terminal a of the switch 45 receives electric power from the USB cable 2, and a terminal b thereof receives electric power from the battery 41. The switch 45, upon detecting a USB connection (i.e., when a current is detected due to connection with the USB cable 2), is forcibly switched to the terminal a so that electric power from the USB cable 2 will be supplied to a power supply line 2. On the other hand, when a USB connection is not detected, the switch 45 is switched to a terminal B so that electric power from the battery 41 will be supplied to the power supply line 2.
  • The regulator 43, under the control of the power controller 50, converts the power supply voltage supplied via the switch 42 from the USB cable 2 or the battery 41 into a voltage of a constant level needed by the CPU 44, and supplies the voltage to the CPU 44 through one or more output lines (three lines in this example). Thus, the CPU 44 is allowed to operate by the electric power supplied from the regulator 43.
  • The regulator 46 converts the power supply voltage supplied via the switch 45 from the USB cable 2 or the battery 41 into a voltage of a constant level needed by the power controller 50, the real-time clock 51, and the interrupt controller 52, and supplies the voltage to each of these components. Thus, the power controller 50, the real-time clock 51, and the interrupt controller 52 are allowed to operate by the electric power supplied from the regulator 46. The regulator 46 also supplies the voltage of the constant level obtained by the conversion to the regulator 47 and the regulator 53.
  • The regulator 47, under the control of the power controller 50, converts the voltage supplied from the regulator 46 into a voltage of a constant level needed by the USB device controller 49, and supplies the voltage to the USB device controller 49 and to the USB clock 48. Thus, the USB clock 48 and the USB device controller 49 are allowed to operate by the electric power supplied from the regulator 47.
  • The regulator 53, under the control of the power controller 50, converts the voltage supplied from the regulator 46 into a voltage of a constant level needed by the backup battery 54, and supplies the voltage to the backup battery 54.
  • The USB device controller 49 operates by a voltage supplied from the regulator 47, and exercises connection control (configuration) on the personal computer 1 connected via the USB port 21 and the USB cable 2. Configuration refers to, for example, loading configuration data that defines setting information (logic functions or wire connections) for USB connection.
  • The power controller 50 operates by a voltage supplied from the regulator 46. Upon detecting a USB connection, the power controller 50 monitors power consumption of the CPU 44 based on the operation status of the CPU 44 (e.g., ON/OFF of 3V circuitry, ON/OFF of 5V circuitry, and ON/OFF of the power of the LCD). The power controller 50 exercises control so that the switch 42 will be switched to the terminal a when the current supplied from the USB cable 2 is less than or equal to 500 mA and so that the switch 42 will be switched to the terminal b when the current supplied from the USB cable 2 is greater than 500 mA.
  • Before configuration, the power controller 50 monitors power consumption based on the operation status of the CPU 44. The power controller 50 exercises control so that the switch 42 will be switched to the terminal a when the current supplied from the USB cable 2 is less than or equal to 100 mA and controls the regulator 43 so that the current supplied from the USB cable 2 will not exceed 100 mA when the switch 42 is switched. Under this situation, the USB device controller 49 executes configuration.
  • More specifically, before USB configuration, when the current supplied from the USB cable 2 exceeds 100 mA, the switch 42 is kept switched to the terminal b even if a current is being supplied from the USB cable 2.
  • During USB suspend, the power controller 50 exercises control so that the switch 42 will be switched to the terminal b and so that the regulator 53 will stop output to the backup battery 54.
  • The power controller 50 controls the respective operations of the CPU 44, the regulator 47, the USB clock 48, and other parts.
  • The backup battery 54 is implemented by a device that is included in the digital still camera 3 and that allows charging and discharging, such as a secondary battery or a capacitor, the device allowing execution of basic functions of the digital still camera 3 (e.g., internal clock and memory) when the digital still camera 3 is detached from a power source such as the battery 41. The backup battery 54 is charged by a voltage that is supplied from the regulator 53.
  • Next, a power supply process that is executed by the digital still camera 3 will be described with reference to a flowchart shown in FIG. 3.
  • In step S1, the power controller 50 determines (detects) whether a USB connection with the personal computer 1 via the USB port 21 and the USB cable 2 is established, and waits until a USB connection is established.
  • When it is determined in step S1 that a USB connection is established, the process proceeds to step S2, in which a power supply process before USB configuration is executed.
  • Now, the power supply process before USB configuration will be described in detail with reference to a flowchart shown in FIG. 4.
  • In step S11, the power controller 50 monitors power consumption based on the operation status of the CPU 44, and determines whether the current supplied from the USB cable 2 is less than or equal to 100 mA. If it is determined that the current supplied from the USB cable 2 exceeds 100 mA, the process proceeds to step S14.
  • In step S14, the power controller 50 exercises control so that the switch 42 will be kept switched to the terminal b. Then, the process returns to step S11, and the process described above is repeated. That is, when the current supplied from the USB cable 2 exceeds 100 mA, electric power from the battery 41 is supplied to the power supply line 1.
  • If it is determined in step S11 that the current supplied from the USB cable 2 is less than or equal to 100 mA, the process proceeds to step S12, in which the power controller 50 exercises control so that the switch 42 will be switched to the terminal a. Thus, electric power from the USB cable 2 is supplied to the power supply line 1.
  • In step S13, the power controller 50 controls the regulator 43 so that the current from the USB cable 2 will not exceed 100 mA when the switch 42 is switched. The USB device controller 49 executes configuration with the personal computer 1 connected via the USB cable 2. The process then returns to step S3 shown in FIG. 3.
  • In step S3, the USB device controller 49 determines whether configuration is completed. If it is determined that configuration is not completed, the process returns to step S2, and the processing described above is repeated.
  • If it is determined in step S3 that configuration is completed, the process proceeds to step S4, in which a power supply process in an established USB connection is executed.
  • Now, the power supply process in an established USB connection will be described with reference to a flowchart shown in FIG. 5.
  • In step S21, the power controller 50 monitors power consumption based on the operation status of the CPU 44, and determines whether the current supplied from the USB cable 2 is less than or equal to 500 mA. If it is determined that the current supplied from the USB cable 2 is less than or equal to 500 mA, the process proceeds to step S22.
  • In step S22, the power controller 50 exercises control so that the switch 42 will be switched to the terminal a. Thus, electric power from the USB cable 2 is supplied to the power supply line 1.
  • If it is determined in step S21 that the current supplied from the USB cable 2 exceeds 500 mA, the process proceeds to step S23, in which the power controller 50 exercises control so that the switch 42 will be switched to the terminal b. Thus, electric power from the battery 41 is supplied to the power supply line 1.
  • Upon completion of processing in step S22 or step S23, the process returns to step S5 shown in FIG. 3.
  • In step S5, the power controller 50 determines whether the USB connection is disconnected. If it is determined that the USB connection is disconnected, the process returns to step S1, and the subsequent processing described above is repeated.
  • If it is determined in step S5 that the USB connection is not disconnected, i.e., when it is determined that the USB connection is maintained, the process proceeds to step S6.
  • In step S6, the power controller 50 determines whether USB suspend has been entered. If it is determined that USB suspend has not been entered, the process returns to step S4, and the subsequent processing described above is repeated.
  • If it is determined in step S6 that USB suspend has been entered, the process proceeds to step S7, in which the power controller 50 exercises control so that the switch 42 will be switched to the terminal b and so that the regulator 53 will stop output to the backup battery 54. Thus, electric power from the battery 41 is supplied to the power supply line 1, and the charging of the backup battery 54 is stopped. Accordingly, the current supplied from the USB bus is maintained to be less than or equal to 500 μA.
  • In step SB, the power controller 50 determines whether the device has returned from USB suspend. If it is determined that the device has not returned from USB suspend, the process returns to step S7, and the processing described above is repeated.
  • If it is determined in step S8 that the device has returned from USB suspend, the process returns to step S4, and the subsequent processing described above is repeated. That is, the power supply process in an established USB connection, described with reference to FIG. 5, is executed again.
  • As described above, the power controller 50 of the digital still camera 3 switches input power source in accordance with a load of the device, so that electric power from the USB bus is used efficiently and the load of the battery 41 is reduced.
  • During USB suspend, charging of the backup battery 54 is stopped, so that wasteful power consumption is minimized.
  • Furthermore, in an established USB connection, the blocks that are at least needed for the operation of the device (the power controller 50, the real-time clock 51, the interrupt controller 52, etc.) are allowed to operate by electric power supplied from the USB bus. This reduces the load of the battery 41 in an established USB connection.
  • The description has been made hereinabove in the context of an example where the personal computer 1 and the digital still camera 3 are USB-connected with each other. However, the present invention can be applied widely to information processing apparatuses that are capable of supplying electric power to electronic devices supporting USB and that include the USB host controller 32, as well as the personal computer 1. Also, the present invention can be applied widely to portable electronic devices supporting USB, such as camcorders and personal digital assistants (PDAs), as well as the digital still camera 3.
  • Furthermore, according to the present invention, although input power source is efficiently switched in an established USB connection, without limitation to USB, for example, when a connection with an IEEE 1394 (Institute of Electrical and Electronic Engineers) bus is established, it is possible to switch input power source efficiently in accordance with the standard. In that case, input power source is switched according to whether the current supplied through the IEEE 1394 bus exceeds 1.5 A.
    • Industrial Applicability
  • According to the present invention, input power source is switched efficiently according to a load of a device.
  • Furthermore, according to the present invention, when an electronic device is connected to another electronic device via an external interface, input power source is switched efficiently according to a load of the device. This reduces the load of a battery.

Claims (7)

1. An electronic apparatus that can be connected to another electronic apparatus via a cable, the electronic apparatus comprising:
first switching means for switching between first electric power of the electronic apparatus and second electric power supplied from the another electronic apparatus via the cable, and supplying either the first electric power or the second electric power to a first power supply line;
second switching means for switching from the first electric power to the second electric power and supplying the second electric power to a second power supply line when the second electric power is supplied from the another electronic apparatus;
determining means for determining whether the second electric power supplied from the another electronic apparatus is less than or equal to a predetermined threshold value; and
controlling means for controlling the first switching means based on a result of determination by the determining means.
2. An electronic apparatus according to claim 1,
further comprising detecting means for detecting a connection with the another electronic apparatus;
wherein the determining means determines whether the second electric power is less than or equal to the predetermined threshold value when the detecting means has detected a connection with the another electronic apparatus,
and wherein the controlling means controls switching of the first switching means so that the second electric power will be supplied to the first power supply line when the determining means has determined that the second electric power is less than or equal to the predetermined threshold value.
3. An electronic apparatus according to claim 1,
further comprising setting processing means for executing processing for setting that is needed for connection with the another electronic apparatus,
wherein the determining means determines whether the second electric power is less than or equal to the predetermined threshold value when the setting processing means is finished,
and wherein the controlling means controls switching of the first switching means so that the second electric power will be supplied to the first power supply line when the determining means has determined that the second electric power is less than or equal to the threshold value.
4. An electronic apparatus according to claim 1, further comprising charging means for charging a backup battery when the second electric power is being supplied from the another electronic apparatus via the cable.
5. An electronic apparatus according to claim 4,
further comprising detecting means for detecting a suspend status of the electronic apparatus connected to the another electronic apparatus via the cable,
wherein when the detecting means has detected the suspend status, the charging means stops charging of the backup battery,
and wherein the controlling means controls switching of the first switching means so that the first electric power will be supplied to the first power supply line.
6. An electronic apparatus according to claim 1,
wherein the cable is a USB cable or an IEEE 1394 cable.
7. A power supply controlling method for an electronic apparatus that is connected to another electronic apparatus via a cable, the power supply controlling method comprising:
a first switching step of switching between first electric power of the electronic apparatus and second electric power supplied from the another electronic apparatus via the cable, and supplying either the first electric power or the second electric power to a first power supply line;
a second switching step of switching from the first electric power to the second electric power and supplying the second electric power to a second power supply line when the second electric power is supplied from the another electronic apparatus;
a determining step of determining whether the second electric power supplied from the another electronic apparatus is less than or equal to a predetermined threshold value; and
a controlling step of controlling processing in the first switching step based on a result of determination by processing in the determining step.
US10/508,629 2002-03-20 2003-01-24 Electronic device and power supply control method Abandoned US20050174710A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US11/876,923 US7550877B2 (en) 2002-03-20 2007-10-23 Electronic apparatus and power supply controlling method

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JPP2002-077730 2002-03-20
JP2002077730A JP3674855B2 (en) 2002-03-20 2002-03-20 Power supply control device and power supply control method
PCT/JP2003/000645 WO2003079673A1 (en) 2002-03-20 2003-01-24 Electronic device and power source control method

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US11/876,923 Continuation US7550877B2 (en) 2002-03-20 2007-10-23 Electronic apparatus and power supply controlling method

Publications (1)

Publication Number Publication Date
US20050174710A1 true US20050174710A1 (en) 2005-08-11

Family

ID=28035532

Family Applications (2)

Application Number Title Priority Date Filing Date
US10/508,629 Abandoned US20050174710A1 (en) 2002-03-20 2003-01-24 Electronic device and power supply control method
US11/876,923 Expired - Fee Related US7550877B2 (en) 2002-03-20 2007-10-23 Electronic apparatus and power supply controlling method

Family Applications After (1)

Application Number Title Priority Date Filing Date
US11/876,923 Expired - Fee Related US7550877B2 (en) 2002-03-20 2007-10-23 Electronic apparatus and power supply controlling method

Country Status (5)

Country Link
US (2) US20050174710A1 (en)
EP (1) EP1487197A1 (en)
JP (1) JP3674855B2 (en)
CN (1) CN1292586C (en)
WO (1) WO2003079673A1 (en)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050050371A1 (en) * 2003-08-27 2005-03-03 Yasumasa Ono Image sensing apparatus and power managing method
US20060209578A1 (en) * 2005-03-16 2006-09-21 Junji Takeshita Power circuit
US20070150549A1 (en) * 2005-12-23 2007-06-28 Samsung Electronics Co., Ltd. Portable recording and/or playback apparatus and operation method thereof
US20070168684A1 (en) * 2005-12-30 2007-07-19 Inventec Appliances Corp. Electronic Device with a Plurality of Charging Modes
US20080229132A1 (en) * 2004-03-26 2008-09-18 Canon Kabushiki Kaisha Image Processing Apparatus and Control Method, and Program and Storage Medium Thereof
US20090079835A1 (en) * 2006-07-31 2009-03-26 Pure Digital Technologies, Inc. Digital video camera with retractable data connector and resident software application
US20090109329A1 (en) * 2007-10-26 2009-04-30 Greg Allen Cummings Data connector for an electronics device
US20090193156A1 (en) * 2008-01-28 2009-07-30 Sony Nec Optiarc Inc. Peripheral device, method of operating peripheral device, host device, method of operating host device, and electronic device system
US20120266001A1 (en) * 2009-12-17 2012-10-18 Jinchuan Sha System, method and mobile terminal for sharing battery between mobile terminals
CN102789298A (en) * 2011-05-17 2012-11-21 施耐德电器工业公司 Power control circuit and method
US20130007336A1 (en) * 2011-07-01 2013-01-03 Ee Wen Chun System and method for providing power through a reverse local data transfer connection
USD677299S1 (en) 2009-10-08 2013-03-05 Cisco Technology, Inc. Electronic device
US20150074636A1 (en) * 2013-09-06 2015-03-12 Texas Instruments Deutschland Gmbh System and method for energy aware program development
US20160268801A1 (en) * 2014-08-29 2016-09-15 Pismo Labs Technology Limited Apparatus and method for a mobile router to receive power from a plurality of power supplies
US10331607B2 (en) * 2016-10-24 2019-06-25 Samsung Electronics Co., Ltd. Method for detecting cable insertion and an electronic device thereof
US20190204895A1 (en) * 2017-12-28 2019-07-04 Canon Kabushiki Kaisha Electronic device and control method thereof
US10411466B2 (en) * 2014-12-21 2019-09-10 Pismo Lab Technology Limited Apparatus and method for a mobile router to receive power from a plurality of power supplies
US10996734B2 (en) 2017-12-28 2021-05-04 Canon Kabushiki Kaisha Electronic device that receives power from power supply apparatus and method thereof
US11003230B2 (en) 2017-12-28 2021-05-11 Canon Kabushiki Kaisha Electronic device that receives power from power supply apparatus and method thereof

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4357356B2 (en) * 2004-05-10 2009-11-04 株式会社東芝 Video signal receiving apparatus and video signal receiving method
JP4350665B2 (en) * 2005-02-25 2009-10-21 京セラ株式会社 Electronic device, charging system, and power supply method
JP2006246602A (en) * 2005-03-03 2006-09-14 Sanyo Electric Co Ltd Power supply controller
US7523338B2 (en) 2005-10-13 2009-04-21 Research In Motion Limited Apparatus and method to support USB enumeration of a bus powered handheld device
DE602005005065T2 (en) * 2005-10-13 2009-03-19 Research In Motion Ltd., Waterloo Apparatus and method for supporting the USB enumeration of a BUS-powered portable device
JP4125328B2 (en) * 2006-04-17 2008-07-30 キヤノン株式会社 Electronic device, control method of peripheral device by electronic device, program, and storage medium
US20080102765A1 (en) * 2006-10-29 2008-05-01 Sony Ericsson Mobile Communications Ab Wireless Adaptor Power Control
KR101391758B1 (en) * 2007-01-11 2014-05-07 삼성전자 주식회사 Battery module and computer system and power supply method thereof
US8432713B2 (en) * 2008-06-02 2013-04-30 Dell Products, Lp System and method for reducing an input current ripple in a boost converter
US7956591B2 (en) * 2008-09-26 2011-06-07 Apple Inc. Power supply with zero power consumption capability
JP2010140269A (en) 2008-12-11 2010-06-24 Sony Corp Terminal device, control method for the terminal device and control program
US20100225176A1 (en) * 2009-03-09 2010-09-09 Apple Inc. Systems and methods for providing protection circuitry to selectively handle multiple cable-types through the same port
WO2011043205A1 (en) * 2009-10-08 2011-04-14 日本電気株式会社 Mobile terminal device, power supply system, and power supply method and power supply program for mobile terminal device
WO2011080915A1 (en) * 2009-12-28 2011-07-07 パナソニック株式会社 Electronic apparatus, method for controlling electronic apparatus, computer program, and recording medium
JP5740975B2 (en) * 2010-12-28 2015-07-01 カシオ計算機株式会社 Imaging apparatus, imaging control method, and program
JP5733042B2 (en) 2011-06-14 2015-06-10 日本電気株式会社 Femtocell radio base station, communication control method and program
CN102857719B (en) * 2012-09-12 2016-08-24 四川迪佳通电子有限公司 A kind of electric power supply control system and method
CN106502365B (en) * 2016-10-26 2019-06-28 合肥联宝信息技术有限公司 A kind of start-up control method and electronic equipment

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6151652A (en) * 1997-06-27 2000-11-21 Canon Kabushiki Kaisha I/O card, electronic equipment using I/O card, and procedure of starting up such electronic equipment
US6580460B1 (en) * 1997-02-28 2003-06-17 Canon Kabushiki Kaisha System connecting power supply line to image sensing device upon data transport
US6983383B1 (en) * 1999-03-31 2006-01-03 Fujitsu Limited Method for providing priority to an ac adaptor if the input to the ac adaptor is above a predetermined value even if the power supply via an interface is present

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6138178A (en) * 1997-01-29 2000-10-24 Fuji Photo Film Co., Ltd. Controlled device storing multiple drivers that judges and downloads a particular driver corresponding to a controller's operating system having an identical or greater version number
JP2000184264A (en) * 1998-12-14 2000-06-30 Olympus Optical Co Ltd Camera
US6271605B1 (en) * 1999-05-04 2001-08-07 Research In Motion Limited Battery disconnect system
US6662301B1 (en) * 1999-08-27 2003-12-09 Canon Kabushiki Kaisha Computer peripheral device, its control method, image pickup device, storage medium, computer system, and computer
JP2001331241A (en) * 2000-05-22 2001-11-30 Sony Corp Power source device of data source device
JP2002095181A (en) * 2000-09-12 2002-03-29 Canon Inc Composite system
JP2002094873A (en) * 2000-09-14 2002-03-29 Fuji Photo Film Co Ltd Digital camera
JP3898889B2 (en) * 2000-12-19 2007-03-28 ペンタックス株式会社 Power auxiliary unit and portable device system
JP2002237971A (en) * 2001-02-13 2002-08-23 Fuji Photo Film Co Ltd Electronic still camera
JP2002271992A (en) * 2001-03-14 2002-09-20 Internatl Business Mach Corp <Ibm> Device and method for supplying power, electrical machinery and apparatus, and method for supplying power in electrical machinery and apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6580460B1 (en) * 1997-02-28 2003-06-17 Canon Kabushiki Kaisha System connecting power supply line to image sensing device upon data transport
US6151652A (en) * 1997-06-27 2000-11-21 Canon Kabushiki Kaisha I/O card, electronic equipment using I/O card, and procedure of starting up such electronic equipment
US6983383B1 (en) * 1999-03-31 2006-01-03 Fujitsu Limited Method for providing priority to an ac adaptor if the input to the ac adaptor is above a predetermined value even if the power supply via an interface is present

Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7293187B2 (en) * 2003-08-27 2007-11-06 Canon Kabushiki Kaisha Image sensing apparatus and power managing method
US20050050371A1 (en) * 2003-08-27 2005-03-03 Yasumasa Ono Image sensing apparatus and power managing method
US7539886B2 (en) 2004-03-26 2009-05-26 Canon Kabushiki Kaisha Image processing apparatus, power saving control method, and program and storage medium thereof
US20080229132A1 (en) * 2004-03-26 2008-09-18 Canon Kabushiki Kaisha Image Processing Apparatus and Control Method, and Program and Storage Medium Thereof
US20060209578A1 (en) * 2005-03-16 2006-09-21 Junji Takeshita Power circuit
US7679321B2 (en) * 2005-03-16 2010-03-16 Mitsumi Electric Co., Ltd. Power circuit
US20070150549A1 (en) * 2005-12-23 2007-06-28 Samsung Electronics Co., Ltd. Portable recording and/or playback apparatus and operation method thereof
US20070168684A1 (en) * 2005-12-30 2007-07-19 Inventec Appliances Corp. Electronic Device with a Plurality of Charging Modes
US7793118B2 (en) * 2005-12-30 2010-09-07 Inventec Appliances Corp. Electronic device with a plurality of charging modes
US7893990B1 (en) 2006-07-31 2011-02-22 Cisco Technology, Inc. Digital video camera with retractable data connector and resident software application
US20090091626A1 (en) * 2006-07-31 2009-04-09 Pure Digital Technologies, Inc. Digital video camera with retractable data connector and resident software application
US20090091625A1 (en) * 2006-07-31 2009-04-09 Pure Digital Technologies, Inc. Digital video camera with retractable data connector and resident software application
US20090086058A1 (en) * 2006-07-31 2009-04-02 Pure Digital Technologies, Inc. Digital video camera with retractable data connector and resident software application
US8325239B2 (en) 2006-07-31 2012-12-04 Cisco Technology, Inc. Digital video camera with retractable data connector and resident software application
US20090079835A1 (en) * 2006-07-31 2009-03-26 Pure Digital Technologies, Inc. Digital video camera with retractable data connector and resident software application
US20090109329A1 (en) * 2007-10-26 2009-04-30 Greg Allen Cummings Data connector for an electronics device
US8189101B2 (en) 2007-10-26 2012-05-29 Cisco Technology, Inc. Data connector for an electronics device
US20090193156A1 (en) * 2008-01-28 2009-07-30 Sony Nec Optiarc Inc. Peripheral device, method of operating peripheral device, host device, method of operating host device, and electronic device system
US8069277B2 (en) 2008-01-28 2011-11-29 Sony Nec Optiarc Inc. System and method for operating USB peripheral device in extented power mode or standard power mode wherein permission from host must be granted before extended power is provided
USD677299S1 (en) 2009-10-08 2013-03-05 Cisco Technology, Inc. Electronic device
US20120266001A1 (en) * 2009-12-17 2012-10-18 Jinchuan Sha System, method and mobile terminal for sharing battery between mobile terminals
US8898492B2 (en) * 2009-12-17 2014-11-25 Zte Corporation System, method and mobile terminal for sharing battery between mobile terminals
WO2012155820A1 (en) * 2011-05-17 2012-11-22 Schneider Electric Industries Sas Circuit and method for power supply control
CN102789298A (en) * 2011-05-17 2012-11-21 施耐德电器工业公司 Power control circuit and method
TWI602062B (en) * 2011-05-17 2017-10-11 Schneider Electric Ind Sas Power control circuit and method
US20130007336A1 (en) * 2011-07-01 2013-01-03 Ee Wen Chun System and method for providing power through a reverse local data transfer connection
US8788852B2 (en) * 2011-07-01 2014-07-22 Intel Corporation System and method for providing power through a reverse local data transfer connection
CN105740194A (en) * 2011-07-01 2016-07-06 英特尔公司 System And Method For Providing Power Through A Reverse Local Data Transfer Connection
US9542179B2 (en) * 2013-09-06 2017-01-10 Texas Instruments Incorporated System and method for energy aware program development
US20150074636A1 (en) * 2013-09-06 2015-03-12 Texas Instruments Deutschland Gmbh System and method for energy aware program development
US20160268801A1 (en) * 2014-08-29 2016-09-15 Pismo Labs Technology Limited Apparatus and method for a mobile router to receive power from a plurality of power supplies
US9787089B2 (en) * 2014-08-29 2017-10-10 Pismo Labs Technology Limited Apparatus and method for a mobile router to receive power from a plurality of power supplies
US10411466B2 (en) * 2014-12-21 2019-09-10 Pismo Lab Technology Limited Apparatus and method for a mobile router to receive power from a plurality of power supplies
US10331607B2 (en) * 2016-10-24 2019-06-25 Samsung Electronics Co., Ltd. Method for detecting cable insertion and an electronic device thereof
US20190204895A1 (en) * 2017-12-28 2019-07-04 Canon Kabushiki Kaisha Electronic device and control method thereof
US10996734B2 (en) 2017-12-28 2021-05-04 Canon Kabushiki Kaisha Electronic device that receives power from power supply apparatus and method thereof
US11003230B2 (en) 2017-12-28 2021-05-11 Canon Kabushiki Kaisha Electronic device that receives power from power supply apparatus and method thereof
US11023030B2 (en) * 2017-12-28 2021-06-01 Canon Kabushiki Kaisha Electronic device and control method thereof

Also Published As

Publication number Publication date
CN1643900A (en) 2005-07-20
US20080055104A1 (en) 2008-03-06
JP3674855B2 (en) 2005-07-27
CN1292586C (en) 2006-12-27
US7550877B2 (en) 2009-06-23
WO2003079673A1 (en) 2003-09-25
EP1487197A1 (en) 2004-12-15
JP2003280771A (en) 2003-10-02

Similar Documents

Publication Publication Date Title
US7550877B2 (en) Electronic apparatus and power supply controlling method
CN113031740B (en) Port controller with power contract negotiation capability
US6963933B2 (en) Data transfer control device, electronic equipment, and power supply switching method
KR100198906B1 (en) Data processing system with battery discharge function
US20100060233A1 (en) Charger with USB detection
EP0750248A2 (en) An information processing system having a power saving function and a control method therefor
JPH05184065A (en) Electronic appliance
US20080174279A1 (en) Battery charging system and method thereof
EP1411425A2 (en) Electronic apparatus and startup control method of storage device
US20130049680A1 (en) Electronic device
US6470290B1 (en) Device having an improved apparatus and method for setting power management mode
JP2005149293A (en) Data transfer control device and electronic apparatus
CN111654093A (en) Voltage control device, method and storage medium
JP2006099354A (en) Data transfer control device and data transfer control method
JP2003330578A (en) Device driver and device
EP2784901B1 (en) Universal serial bus chargers and charging management methods
US20120212057A1 (en) Portable device and image recording device
KR100734421B1 (en) Power supplying apparatus and electronic device using the same
US11003230B2 (en) Electronic device that receives power from power supply apparatus and method thereof
US20200249735A1 (en) Charge control apparatus and charge control system
JP2001202163A (en) Portable electronics
JP2013080392A (en) Usb charging for portable device
CN116088661A (en) Power supply circuit, method and electronic equipment
KR20050016304A (en) Electronic device and power source control method
JP2997584B2 (en) Power control device

Legal Events

Date Code Title Description
AS Assignment

Owner name: SONY CORPORATION, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MASUI, ICHIRO;OGAWA, KATSUNORI;SAKAI, KENICHI;REEL/FRAME:016488/0203;SIGNING DATES FROM 20040602 TO 20040604

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION