JP4843723B2 - Information processing device - Google Patents

Description

  The present invention relates to an information processing apparatus that supplies power to an electronic device to be connected.

  In recent years, with the widespread use of the USB (Universal Serial Bus) (registered trademark) standard, various electronic devices can be connected to an information processing apparatus such as a PC (personal computer) via the USB. Examples of such electronic devices (hereinafter referred to as USB devices) include a keyboard and mouse, and a portable music player with a built-in battery that is charged when a PC is connected.

  With the spread of such battery built-in electronic devices, recent PCs are not only powered on (hereinafter referred to as normal time) but also powered off (hereinafter referred to as standby). In this case, there is known a device that can charge an electronic device by supplying electric power to the electronic device. As such a PC, for example, as in the PC of Patent Document 1, by switching between a circuit unit and a power supply unit during normal time and standby time, power is directly connected from the power supply unit to the connected electronic device even during standby time. It is known what can be supplied to

  Further, a recent USB device has a configuration in which charging is performed only when a differential signal pair transferred via a pair of data signal lines D + and D− constituting the USB has a predetermined voltage difference. There is something. For this reason, recent PCs have a configuration in which a differential signal pair having a predetermined voltage difference is output to the USB device during standby so that the USB device can be charged. There is.

Utility Model Registration No. 3127705

  However, such USB devices usually employ a charging method that depends on different voltage differences (hereinafter referred to as voltage levels) between different products, and conventional PCs charge depending on different voltage levels. Inconveniently, power cannot be supplied to each of the plurality of USB devices having the method.

  The present invention has been made in view of the above, and can appropriately supply electric power to each of a plurality of electronic devices having charging methods depending on different voltage levels when the PC is on standby. An object is to provide a simple information processing apparatus.

  In order to solve the above-described problems and achieve the object, the present invention provides the data for one of a plurality of electronic devices that are replaceably connected via a bus including a data signal line and a power supply line. An information processing apparatus that supplies power through the power supply line according to a voltage value of a signal output through a signal line, and that supplies a first signal having a first voltage difference. Voltage supply means, second voltage supply means for supplying a second signal having a second voltage difference, and the first signal during standby of the information processing device in accordance with an input control signal Or switching means for outputting any one of the second signals to the electronic device via the data signal line.

  Advantageous Effects of Invention According to the present invention, it is possible to appropriately supply power to each of a plurality of electronic devices having charging methods depending on different voltage levels during standby.

FIG. 1 is a block diagram schematically showing the configuration of the PC according to the first embodiment together with peripheral devices. FIG. 2 is a block diagram schematically illustrating the configuration of the USB power supply control unit according to the first embodiment. FIG. 3 is a block diagram schematically illustrating the configuration of the USB power supply control unit according to the second embodiment. FIG. 4 is a block diagram schematically illustrating the configuration of the USB power supply control unit according to the third embodiment.

  Embodiments of an information processing apparatus according to the present invention will be described below in detail with reference to the accompanying drawings.

  A first embodiment of the present invention will be described with reference to FIGS. In this embodiment, an information processing apparatus is applied as a personal computer (hereinafter referred to as a PC). FIG. 1 is a block diagram schematically showing a configuration of a PC according to the present embodiment together with peripheral devices. In the following description, a state in which the PC is activated and the power is on is referred to as normal time, and a state in which the PC is off is referred to as standby time.

  The PC 100 is connected to a display 200, a keyboard 300, a USB (Universal Serial Bus) device 400, and the like. In this embodiment, the USB device is an electronic device such as a portable music player with a built-in battery, and communicates with the PC when connected to the PC via USB. A signal that can be charged from a PC only when a predetermined differential signal is input as a data signal at the time of connection.

  The PC 100 includes a CPU (Central Processing Unit) 101, a North Bridge 103, a graphics controller 105, a main memory 107, a South Bridge 111, an HDD (Hard Disk Drive) 113, and a BIOS-ROM (Basic Input / Output System). -Read Only Memory) 115 and USB power supply control unit 120. The PC 100 also includes connectors C1 to C3 for connection with peripheral devices.

  The CPU 101 controls the operation of the PC 100 and executes a BIOS, an OS, arbitrary application software, and the like loaded from the BIOS-ROM 115 and the HDD 113 to the main memory 107.

  The north bridge 103 is connected to the CPU 101, the graphics controller 105, the main memory 107, and the south bridge 111. The north bridge 103 is an AGP controller that provides an AGP (Accelerated Graphics Port) interface to the graphics controller 105, and a local bus that connects the CPU 101 and the north bridge 103 and a PCI that connects the north bridge 103 and the south bridge 111. A host-PCI bridge that connects to the bus, a DRAM controller that controls the exchange between the main memory 107 and the CPU 101, and the like.

  The graphics controller 105 is connected to a monitor 200 such as an LCD via a connector C1 such as a display connector. The graphic controller 105 includes a RAMDAC (Random Access Memory to Analog Converter), a VRAM (Video Random Access Memory), a video chip, and the like, and generates video data based on a drawing instruction received from the CPU 101. Is written in the VRAM, and the completed video is sent to the monitor 200.

  The main memory 107 is connected to the north bridge 103. The main memory 107 is loaded with a BIOS, an OS, and a predetermined application such as USB application software described later.

  The south bridge 111 is connected to the BIOS-ROM 115, the HDD 113, the keyboard 300, and the USB power supply control unit 120. The south bridge 111 is an IDE (Integrated Drive Electronics) controller that connects and controls the HDD 113 and the like, a PCI-ISA bridge for connecting a PCI (Industrial Standard Architecture) bus and an ISA bus, and a PS (Personal System). A multi-I / O controller that controls input / output of a keyboard connected to the PC 100 via a connector C2 such as a / 2 keyboard connector, a USB controller that provides a USB interface, and the like.

  The BIOS-ROM 115 is connected to the south bridge 111. The BIOS is stored in the BIOS-ROM 115, and the BIOS is loaded from the BIOS-ROM 115 to the main memory 107 by the CPU 101 as necessary. The HDD 113 is connected to the south bridge 111. The HDD 113 stores an OS, USB application software, and the like, and is loaded from the HDD 113 to the main memory 107 by the CPU 101 as necessary.

  The USB power supply control unit 120 is connected to the south bridge 111 and is also connected to the USB device 400 via a connector C3 that is a USB connector.

  Next, the USB power supply control unit 120 will be described more specifically with reference to FIG. FIG. 2 is a block diagram schematically showing the configuration of the USB power supply control unit 120. The USB power supply control unit 120 includes a power supply unit 121, a USB bus switch 122, an analog bus switch 123, a first voltage supply unit 124, and a second voltage supply unit 125.

  The power supply unit 121 is connected to the connector C3 via the power line, and supplies the power Vbus to the USB device 400 connected to the connector C3. The connector C3 has a configuration (not shown) that grounds the USB device 400 when the USB device 400 is connected to the PC 100, and the power supply Vbus supplied by the power supply unit 121 is grounded (GND). It is supplied to the USB device 400 as a reference.

  Here, the power supply unit 121 is capable of supplying the power Vbus to the USB device 400 during both normal and standby times. More specifically, the power supply unit 121 is configured to switch between a normal power supply system (hereinafter referred to as a normal power supply system) and a standby power supply system (hereinafter referred to as a standby power supply system). . The power supply unit 121 supplies power Vbus to the USB device 400 via a normal power system from a commercial power source (not shown) connected to the PC 100 in a normal state. On the other hand, the power supply unit 121 supplies power Vbus from the commercial power supply to the USB device 400 via the standby power supply system during standby. As a result, power can be supplied to the USB device 400 via the standby power supply system even during standby when power cannot be supplied to the USB device 400 via the normal power supply system.

  The USB bus switch 122 is connected to the connector C3 via a pair of data signal lines (hereinafter referred to as differential signal lines) constituting the USB, and a differential signal pair for the USB device 400 connected to the connector C3. Input / output D + and D-. The USB bus switch 122 is connected to an analog bus switch 123, a USB controller and an I / O controller that constitute the south bridge 111, inputs of differential signals D2 + and D2- from the analog bus switch 123, a USB controller Input / output of the differential signal pair D1 + and D1- and the control signal S1 from the I / O controller.

  More specifically, the USB bus switch 122 connects one of the USB controller and the analog bus switch 123 to the USB device 400 in accordance with a control signal S1 described later. As a result, the USB bus switch 122 selects the differential signal pair D1 + and D1- and the differential signal pair D + and D- in the normal state, and enables data communication between the PC 100 and the USB device 400. In other words, when data is transferred from the USB controller to the USB device 400 in the normal state, the USB bus switch 122 sets the differential signal pair D1 + and D1- corresponding to the data as the differential signal pair D + and D-. When data is transferred from the USB device 400 to the USB controller while being output to the USB device 400, the differential signal pair D + and D− corresponding to the data is output to the USB controller as the differential signal pair D1 + and D1-. .

  On the other hand, the USB bus switch 122 selects the differential signal pair D2 + and D2- during standby, and outputs the selected differential signal pair to the USB device 400 as the differential signal pair D + and D-.

  Here, the control signal S1 is input from the I / O controller to the USB bus switch 122 and controls the operation of the USB bus switch 122. More specifically, the control signal S1 controls the USB bus switch 122 so that the connection between the USB device 400 and the analog bus switch 123 is established at the standby time, and between the USB device 400 and the USB controller at the normal time. The USB bus switch 122 is controlled so that the connection is established.

  Note that the USB bus switch 122 selectively performs input / output of data signals performed between the USB controller and the USB device 400. Therefore, from the viewpoint of ensuring high-speed communication of such data signals, an FET (Field) is provided. It is preferable to have a configuration including an effect transistor.

  The analog bus switch 123 is connected to the USB bus switch 122 and the I / O controller, receives the control signal S2 from the I / O controller, and outputs the differential signal pair D2 + and D2- to the USB bus switch 122. To do. The analog bus switch 123 is connected to the first voltage supply unit 124 and the second voltage supply unit 125, and receives the input of the differential signal pair Da + and Da− supplied by the first voltage supply unit 124. At the same time, it receives the differential signal pair Db + and Db− supplied by the second voltage supply unit 125.

  More specifically, the analog bus switch 123 connects one of the first voltage supply unit 124 and the second voltage supply unit 125 to the USB bus switch 122 in accordance with a control signal S2 described later. As a result, the analog bus switch 123 includes the differential signal pair Da + and Da− supplied by the first voltage supply unit 124 and the differential signal pair Db + and Db− supplied by the second voltage supply unit 125. Is selected, and the selected differential signal pair is output to the USB bus switch 122 as a differential signal pair D2 + and D2-. As described later, the control signal S2 here refers to a predetermined voltage supply unit that supplies a voltage level necessary for the USB device 400 connected to the PC 100 to receive power to the data signal line, and the USB device. The analog bus switch 123 is controlled so as to establish a connection with.

  Unlike the USB bus switch 122, the analog bus switch 123 does not perform data transfer input / output with respect to the USB device 400. Therefore, the analog bus switch 123 does not necessarily have a configuration that enables high-speed communication such as an FET. Therefore, in this embodiment, the analog bus switch 123 has a configuration including an analog switch.

  The first voltage supply unit 124 is connected to the analog bus switch 123 and outputs the differential signal pair Da + and Da− to the analog bus switch 123. The second voltage supply unit 125 is connected to the analog bus switch 123 and outputs the differential signal pair Db + and Db− to the analog bus switch 123.

  Next, power supply control for an arbitrary USB device by the USB power supply control unit 120 will be described with a specific example. In the following description, the PC 100 has a specific device (hereinafter, referred to as a power supply line) that accepts power supply via a power line only when a differential signal pair having a certain voltage is input via the data signal line. (Referred to as USB device A) and a predetermined voltage for accepting the supply of power via the power line only when the drive voltage on the D + signal is recognized on the D− signal via a resistor of 0 to 200Ω inside the PC 100. One of these USB devices (hereinafter referred to as USB device B) is connected. The first voltage supply unit 124 supplies the differential signal pair Da + and Da− each having a constant voltage that enables charging of the USB device A, and the second voltage supply unit 125 includes the USB device A. Assume that a differential signal pair Db + and Db− having a short-circuited state through a resistor whose D + signal and D− signal enable charging of B through 0 to 200Ω are supplied.

  The HDD 113 of the PC 100 stores predetermined USB application software that performs power supply control on the USB device 400. In a normal state, the user can select any one of a mode in which the USB device A can be charged and a mode in which the USB device B can be charged via the USB application software loaded and executed from the HDD 113 to the main memory 107 by the CPU 101. A mode can be selected.

  A case where the user requests charging of the USB device A will be described. In this case, the user selects a mode in which the USB device A is set as one of charging targets via the USB application software.

  The BIOS outputs a control signal S2 for controlling the analog bus switch 123 to connect the USB device A and the first voltage supply unit 124 via the south bridge 111 when the power of the PC 100 is turned off. It outputs to 123. As a result, the analog bus switch 123 establishes a connection between the USB bus switch 122 and the first voltage supply unit 124. Next, the BIOS outputs to the USB bus switch 122 a control signal S1 for controlling the USB bus switch 122 so as to connect the USB device A and the analog bus switch 123 to the USB bus switch 122. As a result, the USB bus switch 122 establishes a connection between the USB device A and the analog bus switch 123. As a result, during standby, the differential signal pair Da + and Da− required for charging the USB device A is supplied from the first voltage supply unit 124 to the USB device A.

  Even when the user requests charging of the USB device B, a mode in which the USB device B is set as one of charging targets as a charging target device via the USB application software in the same manner as described above. By selecting, the differential signal pair Db + and Db− required for charging the USB device B can be appropriately supplied from the second voltage supply unit 125 to the USB device during standby.

  As described above, in the information processing apparatus according to the present embodiment, the USB device that charges only when the data signal line is supplied with a certain voltage level and the data signal line are short-circuited when the PC is on standby. Two voltage supply units that supply a signal level at which each USB device that is charged only in such a case can be switched are provided to be switchable. As a result, the USB device can be appropriately charged.

  Note that in the information processing apparatus of this embodiment, the voltage supplied by the voltage supply unit may be variable. More specifically, for example, the user may be able to set the voltage of the voltage supply unit via USB application software. Further, as a signal supplied by the power supply unit, a signal that can be authenticated for starting charging, such as a constant voltage signal, a D + and D− short circuit signal, and a pulse waveform signal, may be employed.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. The information processing apparatus according to the present embodiment differs from the information processing apparatus according to the first embodiment in that the USB power supply control unit further includes a second analog bus switch and a third voltage supply unit. Therefore, the same parts as those of the first embodiment are denoted by the same reference numerals, and description thereof is also omitted.

  FIG. 3 is a block diagram schematically showing the configuration of the power supply control unit of the present embodiment. The power supply control unit 220 includes a power supply unit 121, a USB bus switch 122, a first analog bus switch 223a, a second analog bus switch 223b, a first voltage supply unit 124, and a second voltage supply. Unit 125 and a third voltage supply unit 226.

  The first voltage supply unit 124 is connected to the first analog bus switch 223a and outputs the differential signal pair Da + and Da− to the first analog bus switch 223a. The second voltage supply unit 125 is connected to the second analog bus switch 223b, and outputs the differential signal pair Db + and Db− to the second analog bus switch 223b. Further, the third voltage supply unit 226 is connected to the second analog bus switch 223b, and outputs the differential signal pair Dc + and Dc− to the second analog bus switch 223b.

  The first analog bus switch 223a is connected to the I / O controller and receives an input of the control signal S3 from the I / O controller. The first analog bus switch 223a is connected to the USB bus switch 122 in response to a control signal S3 that controls the first analog bus switch 223a so as to connect the USB device 400 and the first voltage supply unit 124. The connection with the first voltage supply unit 124 is established, and the differential signal pair Da + and Da− is output to the USB bus switch 122 as the differential signal pair D2 + and D2−.

  On the other hand, the first analog bus switch 223a controls the first analog bus switch 223a so as to connect the USB device 400 and one of the second voltage supply unit 124 and the third voltage supply unit 226. In response to the control signal S3, the connection between the USB bus switch 122 and the second analog bus switch 223b is established, and a differential signal pair Dd + and Dd− output from the second analog bus switch 223b, which will be described later, is differentially set. The signal pair D2 + and D2- is output to the USB bus switch 122.

  The second analog bus switch 223b is connected to the I / O controller and receives an input of the control signal S3 from the I / O controller. The second analog switch 223b is connected to the first analog bus switch 223a in response to a control signal S3 that controls the second analog bus switch 223b so as to connect the USB device 400 and the second voltage supply unit 125. The connection with the second voltage supply unit 125 is established, and the differential signal pair Db + and Db− is output to the first analog bus switch 223a as the differential signal pair Dd + and Dd−.

  On the other hand, the second analog bus switch 223b is connected to the USB device 400 and the third voltage supply unit 226 in response to a control signal S3 that controls the second analog bus switch 223b. The connection between the H.223a and the third voltage supply unit 226 is established, and the differential signal pair Dc + and Dc- is output to the first analog bus switch 223a as the differential signal pair Dd + and Dd-.

  Next, power supply control by the USB power supply control unit 220 will be described. In the following description, USB device A that accepts power supply via the power supply line and differential signal pair Db + and Db− only when differential signal pair Da + and Da− are input via the data signal line. A USB device B that accepts power supply through the power supply line only when it is input through the data signal line, and a power supply line only when the differential signal pair Dc + and Dc− is input through the data signal line A case will be described in which one of the USB device C that accepts the supply of power through the PC 100 is connected to the PC 100.

  As in the first embodiment, the user can charge the USB device A, the USB device B, the USB device B, and the USB device C via the USB application software. Either mode can be selected.

  A case where the user requests charging of the USB device A will be described. In this case, the user selects a mode in which the USB device A is set as one of charging targets via the USB application software.

  The BIOS outputs a control signal S3 for controlling the first analog bus switch 223a so that the USB device A and the first voltage supply unit 124 are connected via the south bridge 111 when the power of the PC 100 is turned off. To the first analog bus switch 223a. As a result, the first analog bus switch 223a establishes a connection between the USB bus switch 122 and the first voltage supply unit 124. Thus, when the USB device A is connected to the PC 100 during standby, the differential signal pair Da + and Da− necessary for charging the USB device A is appropriately supplied via the data signal line. Is possible.

  A case where the user requests charging of the USB device B will be described. In this case, the user selects a mode in which the USB device B is set as one of charging targets via the USB application software.

  The BIOS connects the first analog bus switch 223a and the second analog bus switch so as to connect the USB device 400 and the second voltage supply unit 125 via the south bridge 111 when the power of the PC 100 is turned off. A control signal S3 for controlling 223b is output to the first analog bus switch 223a and the second analog bus switch 223b. As a result, the first analog bus switch 223a establishes a connection between the USB bus switch 122 and the second analog bus switch 223b, and the second analog bus switch 223b connects the first analog bus switch 223a and the second analog bus switch 223a. Connection with the voltage supply unit 125 is established. Thus, when the USB device B is connected to the PC 100 during standby, the USB device B is appropriately supplied with the differential signal pair Db + and Db− required for charging via the data signal line. Is possible. Similarly, when the USB device C is connected to the PC 100 during standby, the differential signal pair Dc + and Dc− necessary for charging the USB device C can be appropriately supplied.

  As described above, the information processing apparatus according to the present embodiment further includes the second analog bus switch and the third voltage supply unit, so that different voltage levels are supplied to the data signal lines during standby. Even when three USB devices that are charged only in the case are connected to a PC, each USB device can be appropriately charged.

  Note that the information processing apparatus of this embodiment may include a plurality of analog bus switches and a plurality of voltage supply units. As a result, each of the plurality of USB devices can be appropriately charged.

  Further, in the information processing apparatus according to the present embodiment, at least one of the plurality of voltage supply units has recognized the drive voltage on the D + signal on the D− signal through the resistance of 0 to 200Ω within the PC 100. Only in such a case, a differential signal pair that can charge a predetermined USB device that accepts supply of power via the power supply line may be supplied to the USB device.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. The information processing apparatus according to the present embodiment is different from the information processing apparatus of the first embodiment in that it further includes a third voltage supply unit. Therefore, the same parts as those of the first embodiment are denoted by the same reference numerals, and description thereof is also omitted.

  FIG. 4 is a block diagram schematically illustrating the configuration of the power supply control unit according to the third embodiment. The USB power supply control unit 320 includes a power supply unit 121, a USB bus switch 122, an analog bus switch 323, a first voltage supply unit 124, a second voltage supply unit 125, and a third voltage supply unit 226. And comprising.

  The third voltage supply unit 226 is connected to the analog bus switch 323 and outputs the differential signal pair Dc + and Dc− to the analog bus switch 323.

  The analog bus switch 323 is connected to the I / O controller and receives an input of the control signal S4 from the I / O controller. The analog bus switch 323 is connected to the USB bus switch 122 and the first voltage supply unit in response to a control signal S4 that controls the analog bus switch 323 so as to connect the USB device 400 and the first voltage supply unit 124. 124 is established, and the differential signal pair Da + and Da- is output to the USB bus switch 122 as the differential signal pair D2 + and D2-.

  The analog bus switch 323 is connected to the USB bus switch 122 and the second voltage supply unit in response to a control signal S4 that controls the analog bus switch 323 so as to connect the USB device 400 and the second voltage supply unit 125. 125 is established, and the differential signal pair Db + and Db− is output to the USB bus switch 122 as the differential signal pair D2 + and D2−.

  Further, the analog bus switch 323 is connected to the USB bus switch 122 and the third voltage supply unit according to a control signal S4 for controlling the analog bus switch 323 so as to connect the USB device 400 and the third voltage supply unit 226. 226 is established, and the differential signal pair Dc + and Dc− is output to the USB bus switch 122 as the differential signal pair D2 + and D2−.

  Next, power supply control by the USB power supply control unit 320 will be described. Hereinafter, the USB device A that receives power supply via the power supply line only when the differential signal pair Da + and Da− are input via the data signal line, and the differential voltage pair Db + and Db− are described. A USB device B that accepts power supply through the power supply line only when it is input through the data signal line, and a power supply line only when the differential voltage pair Dc + and Dc− is input through the data signal line A case will be described in which one of the USB device C that accepts the supply of power through the PC 100 is connected to the PC 100.

  As in the first embodiment, the user can charge the USB device A, the USB device B, the USB device B, and the USB device C via the USB application software. One of the modes can be selected.

  A case where the user requests charging of the USB device A will be described. In this case, the user selects a mode in which the USB device A is set as one of charging targets via the USB application software.

  The BIOS outputs a control signal S4 for controlling the analog bus switch 323 to establish a connection between the USB device A and the first voltage supply unit 124 via the south bridge 111 when the power of the PC 100 is turned off. Output to the bus switch 323. As a result, the analog bus switch 323 establishes a connection between the USB bus switch 122 and the first voltage supply unit 124. Thus, when the USB device A is connected to the PC 100 during standby, the differential signal pair Da + and Da− necessary for charging the USB device can be appropriately supplied to the USB device via the data signal line. It becomes possible. Similarly, when the USB device B is connected to the PC 100 in the standby state, the differential signal pair Db + and Db− required for charging the USB device B is appropriately connected via the data signal line. When the USB device C is connected to the PC 100 during standby, the differential signal pair Dc + and Dc− required for charging the USB device C via the data signal line is connected to the USB device C. Thus, it can be appropriately supplied to the USB device C.

  As described above, in the information processing apparatus according to the present embodiment, when three voltage supply units are connected to one analog bus switch, different voltage levels are supplied to the data signal lines during standby. Even when three USB devices that only charge are connected to a PC, each USB device can be appropriately charged.

  In the information processing apparatus according to the present embodiment, three voltage supply units are connected to the analog bus switch, but four or more voltage supply units may be connected to the analog bus switch. Thereby, it becomes possible to charge each of those USB devices appropriately.

  Further, in the information processing apparatus according to the present embodiment, at least one of the plurality of voltage supply units has recognized the drive voltage on the D + signal on the D− signal through the resistance of 0 to 200Ω within the PC 100. Only in such a case, a differential signal pair that can charge a predetermined USB device that accepts supply of power via the power supply line may be supplied to the USB device.

  DESCRIPTION OF SYMBOLS 100 ... PC, 101 ... CPU part, 103 ... North bridge, 105 ... Graphics controller, 107 ... Main memory, 111 ... South bridge, 113 ... HDD, 115 ... BIOS-ROM, 120, 220, 320 ... USB power supply control part 121 ... Power supply unit, 122 ... USB bus switch, 123,323 ... Analog bus switch, 223a ... First analog bus switch, 223b ... Second analog bus switch, 124 ... First voltage supply unit, 125 ... 2nd voltage supply part, 226 ... 3rd voltage supply part, 200 ... Display, 300 ... Keyboard, 400 ... USB device

Claims (16)

The power supply line according to a voltage value of a signal output via the data signal line to one of a plurality of electronic devices connected in a replaceable manner via a bus including the data signal line and the power supply line An information processing apparatus that supplies power via
First voltage supply means for supplying a first signal having a first voltage difference;
Second voltage supply means for supplying a second signal having a second voltage difference;
Switching means for outputting either the first signal or the second signal to the electronic device via the data signal line when the information processing apparatus is on standby according to an input control signal;
An information processing apparatus comprising: The control signal is composed of a first control signal and a second control signal,
The switching means is configured to switch the first signal or the second signal in accordance with a combination of the content indicated by the first control signal and the content indicated by the second control signal input when the information processing apparatus enters the standby state. The information processing apparatus according to claim 1, wherein any one of the signals is output. The first voltage difference is a voltage difference required for the first electronic device among the plurality of electronic devices to receive power supply;
The second voltage difference is a voltage difference required for the second electronic device among the plurality of electronic devices to receive power supply,
In response to the control signal, the switching means outputs the first signal when the first electronic device is connected, while the second electronic device is connected when the second electronic device is connected. The information processing apparatus according to claim 1, wherein a signal is output. Further comprising third voltage supply means for supplying a third signal having a third voltage difference;
The switching means outputs any one of the first signal, the second signal, and the third signal to the electronic device via the data signal line in response to the control signal. The information processing apparatus according to claim 1, wherein: The power supply according to a voltage value of a signal output via the data signal line with respect to one of a plurality of electronic devices connected in a replaceable manner via a bus including a data signal line and a power supply line An information processing apparatus that supplies power via a wire,
First voltage supply means for supplying a first signal having a first voltage difference;
Second voltage supply means for supplying a second signal having a second voltage difference;
Power supply control means for outputting either the first signal or the second signal to the electronic device via the data signal line when the information processing apparatus is on standby according to an input control signal;
An information processing apparatus comprising: The control signal is composed of a first control signal and a second control signal,
The power supply control unit is configured to output the first signal or the first signal according to a combination of the content indicated by the first control signal and the content indicated by the second control signal input when the information processing apparatus enters the standby state. 6. The information processing apparatus according to claim 5, wherein one of the two signals is output. The first voltage difference is a voltage difference required for the first electronic device among the plurality of electronic devices to receive power supply;
The second voltage difference is a voltage difference required for the second electronic device among the plurality of electronic devices to receive power supply;
In response to the control signal, the power supply control means outputs the first signal when the first electronic device is connected, while the second electronic device is connected when the second electronic device is connected. The information processing apparatus according to claim 5, wherein a signal is output. When a signal output via the data signal line has a predetermined voltage value for one of a plurality of electronic devices connected in a replaceable manner via a bus including a data signal line and a power supply line An information processing apparatus that supplies power via the power line,
First voltage supply means for supplying a first signal having a constant voltage value;
First voltage supply means for supplying a second signal in which the signals are short-circuited via a resistor;
Power supply control means for outputting either the first signal or the second signal to the electronic device via the data signal line when the information processing apparatus is on standby according to an input control signal;
An information processing apparatus comprising: The control signal is composed of a first control signal and a second control signal,
The power supply control unit is configured to output the first signal or the first signal according to a combination of the content indicated by the first control signal and the content indicated by the second control signal input when the information processing apparatus enters the standby state. 9. The information processing apparatus according to claim 8, wherein one of the two signals is output.   In response to the control signal, the power supply control means outputs the first signal when the first electronic device is connected, while the second electronic device is connected when the second electronic device is connected. The information processing apparatus according to claim 8, wherein a signal is output. The power supply according to a voltage value of a signal output via the data signal line with respect to one of a plurality of electronic devices connected in a replaceable manner via a bus including a data signal line and a power supply line An information processing apparatus that supplies power via a wire,
During the standby of the information processing apparatus, either the first signal having the first voltage difference or the second signal having the second voltage difference is output to the electronic device via the data signal line. An information processing apparatus comprising a power supply control unit.   12. The information according to claim 11, wherein the power supply control unit switches whether to output the first signal or the second signal to the electronic device according to an input control signal. Processing equipment. The control signal is composed of a first control signal and a second control signal,
The power supply control unit is configured to output the first signal or the first signal according to a combination of the content indicated by the first control signal and the content indicated by the second control signal input when the information processing apparatus transitions to a standby state. The information processing apparatus according to claim 12, wherein any one of the two signals is output. The power supply according to a voltage value of a signal output via the data signal line with respect to one of a plurality of electronic devices connected in a replaceable manner via a bus including a data signal line and a power supply line An information processing apparatus that supplies power via a wire,
During the standby of the information processing apparatus, either the first signal having a constant voltage value or the second signal in which the signals are short-circuited via a resistor is transmitted to the electronic device via the data signal line. An information processing apparatus comprising an output power supply control unit.   15. The information according to claim 14, wherein the power supply control unit switches whether to output the first signal or the second signal to the electronic device according to an input control signal. Processing equipment. The control signal is composed of a first control signal and a second control signal,
The power supply control unit is configured to output the first signal or the first signal according to a combination of the content indicated by the first control signal and the content indicated by the second control signal input when the information processing apparatus transitions to a standby state. The information processing apparatus according to claim 15, wherein any one of the two signals is output.

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