`Shiga
`
`USOO6625738B1
`(10) Patent No.:
`US 6,625,738 B1
`(45) Date of Patent:
`Sep. 23, 2003
`
`(54) USB APPARATUS THAT TURNS ON
`COMPUTER POWER SUPPLY USING
`SIGNALS SUBSTANTIALLY LONGER THAN
`INFORMATION CONVEYING PULSE
`WDTHS WHEN PREDETERMINED
`OPERATION IS PERFORMED ON INPUT
`DEVICE
`
`(75) Inventor: Sadakazu Shiga, Fukushima-ken (JP)
`Assignee: Alps Electric Co., Ltd., Tokyo (JP)
`(73)
`Notice:
`Subject to any disclaimer, the term of this
`(*)
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 0 days.
`
`(21) Appl. No.: 09/454,621
`(22) Filed:
`Dec. 6, 1999
`(30)
`Foreign Application Priority Data
`Dec. 15, 1998
`(JP) ........................................... 1O-355T 10
`(51) Int. Cl." .................................................. G06F 1/26
`(52) U.S. Cl. .......................................... 713/310; 710/67
`(58) Field of Search ................................. 713/310,323,
`713/324; 710/67
`
`(56)
`
`References Cited
`
`U.S. PATENT DOCUMENTS
`5,249,298 A : 9/1993 Bolan et al. ................ 713/340
`S-S-29. A
`19 Forest et al. r. 1332
`5,590,343 A * 12/1996 Bolan et al. ......
`... 713/300
`5,767,844 A * 6/1998 Stoye ...........
`... 34.5/212
`5,799,196 A * 8/1998 Flannery ...........
`... 713/320
`6,092.207 A * 7/2000 Kolinski et al. ............ 713/323
`
`6,202,161 B1 * 3/2001 Wang ......................... 713/310
`6,205,502 B1 * 3/2001 Endo et al. ................. 710/100
`6,237,100 B1 * 5/2001 Cromer et al. .............. 713/300
`
`FOREIGN PATENT DOCUMENTS
`
`JP
`
`1O-312235
`
`11/1998
`
`* cited by examiner
`
`Primary Examiner Thomas Lee
`Assistant Examiner Albert Wang
`(74) Attorney, Agent, or Firm-Brinks Hofer Gilson &
`Lione
`ABSTRACT
`(57)
`An apparatus for turning on a computer power Supply in
`which when an input operation of a predetermined key is
`carried out, predetermined H Signals are output to a first
`Signal line and a Second Signal line of a USB chip provided
`in a keyboard. Since this signal combination is not a USB
`Standard Signal combination, they can be distinguished from
`ordinary data Signals. Since a wake-up device which has
`received these signals outputs predetermined Start-up signals
`to a main power Supply, the main power Supply can be
`turned on. When the main power Supply is turned on,
`connections of a first relay contact and a Second relay
`contact of a Switching device Switch are Switched, whereby
`first signal lines and Second Signals between the host com
`puter and a keyboard are connected together, making it
`possible to carry out communication using the Signals. By
`Virtue of this Structure, it is possible to Start up the host
`computer whose main power supply is in an off state by
`operating the kewboard
`p
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`81 Claims, 1 Drawing Sheet
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`Petitioners Ex. 1013
`IPR USP 7,239,111
`Page 1 of 11
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`Petitioners Ex. 1013
`
`IPR USP 7,239,111
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`Petitioners Ex. 1013
`IPR USP 7,239,111
`Page 2 of 11
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`1
`USBAPPARATUS THAT TURNS ON
`COMPUTER POWER SUPPLY USING
`SIGNALS SUBSTANTIALLY LONGER THAN
`INFORMATION CONVEYING PULSE
`WDTHS WHEN PREDETERMINED
`OPERATION IS PERFORMED ON INPUT
`DEVICE
`
`BACKGROUND OF THE INVENTION
`
`1O
`
`1. Field of the Invention
`The present invention relates to a power-on function of,
`for example, a host computer including a universal Serial bus
`(USB) interface, and more particularly to an apparatus for
`turning on a computer power Supply, which is constructed So
`as to Start up the host computer as a result of an operation
`of an input device, Such as a keyboard, when a main power
`Supply of the host computer is in an off State.
`2. Description of the Related Art
`In conventional computers, pieces of Software are built in
`as resident programs in order to prevent wasteful energy
`consumption and to increase the efficiency with which
`energy is Saved when the host computer is not used for a
`long time.
`In executing the resident program, when an input opera
`tion is not performed within a predetermined period of time
`from the most recent operation that has been performed at
`the input device, Such as a keyboard, an operation which
`changes an electrical power mode of the host computer to a
`Suspend mode is carried out. In the Suspend mode, the clock
`Speed of a central processing unit (CPU) is reduced, a drive
`motor of a hard disk or a floppy disk is stopped, and a
`display is turned off, So that the amount of electrical current
`Supplied to the host computer for consumption is Such that
`the host computer is Set in a low electrical power State.
`When the host computer is Set in the Suspend mode, and
`the input device, Such as a keyboard, is operated, the host
`computer receives information that the input device has been
`operated. This information is received in the form of a
`Start-up signal. When this start-up signal is input to the host
`computer, the clock Speed of the CPU returns to its original
`Speed, the hard disk or the floppy disk drive motor is started
`again, and the display is turned on again. Accordingly, the
`host computer is restored to the State prior to the Suspend
`mode State.
`Personal computer peripheral interfaces that have been
`primarily used for a long time are serial ports (RS232-C) and
`Centronics parallel ports. However, these types of peripheral
`interfaces have the following problems. The first problem is
`that the transfer speed limit is low. The second problem is
`that a larger number of ports need to be used when con
`necting a plurality of devices because only one device can be
`connected to one port. The third problem is that Separate
`ports need to be provided for connecting a keyboard, a
`mouse, a display, etc., So that various connectors get
`crowded on the back Side of the personal computers.
`To overcome the above-described problems, there has
`been proposed the USB, which allows various peripheral
`devices to be connected to only one connector as a result of
`integrating these interfaces. The USB has been rapidly
`attracting attention as a Standard peripheral interface of the
`next generation.
`However, in the above-described conventional
`computers, the Suspend and restore functions are provided
`on the assumption that the main power Supply of the host
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`US 6,625,738 B1
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`computer is in an on State. Therefore, when the main power
`Supply is in an off State, the host computer cannot be started
`with the above-described Software.
`There has been a demand for adding value to Such
`computers connected with the USB interface by providing a
`function that the USB does not have, that is, by providing a
`key called a power-on key, which allows the host computer
`to be started by a key input operation at a keyboard.
`SUMMARY OF THE INVENTION
`Accordingly, it is an object of the present invention to
`provide an apparatus for turning on a computer power
`Supply, which is constructed So as to Start up a host computer
`including a USB interface by turning on a main power
`Supply as a result of operating an input device when a Switch
`of the main power Supply of the host computer is in an off
`State.
`To overcome the above-described conventional problems,
`according to a basic form of the present invention, there is
`provided an apparatus for turning on a computer power
`Supply, comprising a host computer; an input device con
`nected to the host computer through an interface; a main
`power Supply for Starting up the host computer; and a
`Sub-power Supply for applying electrical power to the input
`device when the main power Supply is in an off State;
`wherein the host computer comprises wake-up means for
`turning on the main power Supply to Start up the host
`computer as a result of a predetermined operation performed
`at the input device when the main power Supply is in an off
`State.
`According to the present invention, when the Switch of the
`main power Supply of the host computer is in an off State,
`and a keyboard, for example, is operated, the main power
`Supply is turned on to start up the host computer.
`To make this operation possible, the Sub-power Supply
`(which is a battery) of the host computer Supplies electrical
`power to the input device, Such as a keyboard, through the
`interface. Therefore, when the main power Supply of the host
`computer is in an off State, the electrical power level of the
`host computer is set low (which is also the case when the
`host computer is set in its ordinary Suspend mode).
`When the predetermined operation is performed at the
`input device, the main power Supply is turned on. Here, the
`operation may be performed on a special-purpose power-on
`key on the keyboard or on any combination of a plurality of
`keys. The operation may also be performed on a Switch of,
`for example, a mouse for a predetermined time or a prede
`termined number of times.
`In another form of the present invention, an apparatus for
`turning on a computer power Supply may further comprise
`Switching means disposed at the interface, wherein when the
`main power Supply is in an on State, the Switching means
`connects a Signal line of the host computer and a signal line
`of the input device, and wherein when the main power
`Supply is in an off State, the Switching means Switches
`connections So that the wake-up means and the Signal line of
`the input device are connected together; and
`wherein when the main power Supply is in the off State,
`and a predetermined operation is performed at the input
`device, a Start-up signal generated by the wake-up means is
`applied to the main power Supply to turn on the main power
`Supply, whereby the Switching means Switches connections
`So that the Signal line of the host computer and the Signal line
`of the input device are connected together.
`The Switching means may be, for example, a relay or a
`logic circuit.
`
`Petitioners Ex. 1013
`IPR USP 7,239,111
`Page 3 of 11
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`3
`In this case, when the main power Supply is in an off State,
`the wake-up means and the input means, Such as a keyboard,
`are connected together. When, for example, a predetermined
`key on the keyboard is operated, the main power Supply is
`turned on by the wake-up means to Start up the host
`computer, and the Signal line of the host computer and the
`Signal line of the input device are connected together.
`Therefore, after the host computer has been Started, a signal
`indicating that the input operation has been performed at the
`keyboard can be transmitted to the host computer.
`In Still another form of the present invention, when an
`apparatus for turning on a computer power Supply comprises
`a host computer, an input device connected to the host
`computer through an interface, a main power Supply for
`Starting up the host computer, and a Sub-power Supply for
`applying electrical power to the input device when the main
`power Supply is in an off State, and when the host computer
`comprises wake-up means, the interface may comprise four
`Signal lines, that is, a universal Serial bus Standard power
`Supply line, a first signal line, a Second Signal line, and a
`ground line. In addition, the wake-up means may comprise
`first comparing means for detecting whether or not a value
`of the first Signal line is equal to or greater than a predeter
`mined Standard value, Second comparing means for, detect
`ing whether or not a value of the Second Signal line is equal
`to or greater than the predetermined Standard value, and an
`AND circuit for determining a logical OR between the first
`comparing means and the Second comparing means, with the
`main power Supply being turned on when the logical OR
`reaches a predetermined value.
`In still another form of the present invention, when the
`interface comprises four Signal lines, that is, a universal
`Serial bus Standard power Supply line, a first signal line, a
`Second Signal line, and a ground line, and when the wake-up
`means comprises first comparing means, Second comparing
`means, and an AND circuit, the predetermined operation
`may be performed at the input device in order to output H
`35
`Signals of a predetermined pulse width to both the first Signal
`line and the Second Signal line, after which the H signals
`with a predetermined pulse width equal to or greater than the
`predetermined pulse width are output from the AND circuit
`to turn on the power Supply.
`The communication mode in which both of the first signal
`line and the Second Signal line are in an H State result from
`a combination that does not exist in ordinary USB standard
`operation modes. Therefore, when the wake-up means is
`constructed So that it starts up when H Signals are applied to
`both of these lines, there is no obstacle to carrying out
`ordinary communications using the USB interface. When
`the communication mode is Switched at the USB interface,
`the first Signal line and the Second signal line may both be
`instantaneously set in the H state. When the duration in
`which the first Signal line and the Second Signal line are in
`the H State becomes equal to or greater than a predetermined
`time period (more specifically, a time period which is longer
`than a USB Standard Signal transfer rate), and an attempt is
`made to Start up the wake-up means, it is possible to prevent
`confusion with the case where communication modes are
`Switched by the USB interface.
`With the first Signal line and the Second Signal line being
`Set in the H State when the main power Supply is on and input
`from the input device is temporarily Stopped, the main
`power Supply can be turned off by Setting both the first signal
`line and the Second Signal line in an L State for a predeter
`mined period of time as a result of carrying out the prede
`termined operation at the input device.
`BRIEF DESCRIPTION OF THE DRAWING
`FIG. 1 is a structural view of an embodiment of the
`apparatus for turning on a computer power Supply in accor
`dance with the present invention.
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`DESCRIPTION OF THE PREFERRED
`EMBODIMENT
`A description will now be given of the present invention
`with reference to the drawing.
`FIG. 1 is a structural view of an embodiment of the
`apparatus for turning on a computer power Supply in accor
`dance with the present invention.
`Referring to FIG. 1, a host computer 1 and a keyboard 11
`(which is an example of an input device) are disposed on the
`left and right Sides of line I-I, respectively.
`In the interior of the host 1 of FIG. 1 are provided a
`universal Serial bus (USB) chip 2 of large-scale integration
`for a USB interface; a wake-up means 3; a Switching means
`4; a main power Supply 5, and a Sub-power Supply 6. The
`USB chip 2 includes a power Supply input terminal Vcc, a
`ground terminal GND, a first signal line D+, and a Second
`signal line D-, which correspond to those in a USB interface
`specification. FIG. 1 shows only the terminals that are
`particularly important for the USB interface, so that the rest
`of the terminals of the USB chip 2 are not shown. In FIG.
`1, an output voltage generated between a +terminal and a
`GND terminal of the main power supply 5 is expressed as E,
`and an output Voltage generated between an OUT terminal
`and a GND terminal of the sub-power supply 6 is expressed
`as V. The power supply input terminal Vcc of the USB chip
`2 is connected to the +terminal of the main power Supply 5,
`while the GND terminal thereof is grounded to a ground
`line. The USB chip 2 is thus driven when electrical power is
`applied thereto from the main power Supply 5. It is con
`nected to a central processing unit (CPU) in the host
`computer 1 by a local bus, and controlled by the CPU.
`The wake-up means 3 comprises a first comparing means
`3A and a Second comparing means 3B, both of which are, for
`example, OP amplifiers. A first input terminal 3A1 of the
`first comparing means 3A and a first input terminal 3B1 of
`the Second comparing means 3B are grounded through
`respective predetermined resistors. A Standard Voltage 7 (for
`example, 1.5 volts) is applied to a second input terminal 3A2
`of the first comparing means 3A and to a Second input
`terminal 3 B2 of the Second comparing means 3B. An output
`terminal 3A3 of the first comparing means 3A is connected
`to an input terminal 8a of an AND circuit 8 and an output
`terminal 3B3 of the second comparing means 3B is con
`nected to an input terminal 8b of the AND circuit 8. An
`output terminal 8c of the AND circuit 8 is connected to a
`power-on terminal 5a of the main power supply 5. A USB
`chip 12 is provided in the keyboard 11. It is controlled by,
`for example, an 8-bit microcomputer (not shown), which is
`a controlling means (or a signal-generating means) provided
`in, for example, the keyboard 11. The USB chip 2 provided
`in the host computer 1 and the USB chip 12 provided in the
`keyboard 11 are connected together through a USB cable 9.
`The Switching means 4 is, for example, a relay, and is
`provided between a connector terminal 1a, provided for the
`USB cable 9, and the USB chip 2 of the host computer 1.
`The Switching means 4 of FIG. 1 includes a first relay
`contact 4A and a Second relay contact 4B. The first relay
`contact 4A includes two connecting terminals 4A1 and 4A2
`provided at the host computer 1 side, and one connecting
`terminal 4A3 provided at the keyboard 11 side. Similarly,
`the Second relay contact 4B includes two connecting termi
`nals 4B1 and 4B2 provided at the host computer 1 side, and
`one connecting terminal 4B3 provided at the keyboard 11
`Side.
`The connecting terminal 4A1 of the first relay contact 4A
`is connected to the input terminal 3A1 of the first comparing
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`Petitioners Ex. 1013
`IPR USP 7,239,111
`Page 4 of 11
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`US 6,625,738 B1
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`means 3A, and the connecting terminal 4B1 of the Second
`relay contact 4B is connected to the input terminal 3B1 of
`the Second comparing means 3B. The connecting terminal
`4A2 of the first relay contact 4A is connected to the first
`Signal line D+ of the USB chip 2, and the connecting
`terminal 4B2 of the second relay contact 4B is connected to
`the second signal line D- of the USB chip 2. Through the
`connecting connector terminal 1a and the USB cable 9, the
`connecting terminal 4A3 of the first relay contact 4A and the
`connecting terminal 4B3 of the second relay contact 4B are
`connected to a first Signal line D+ and a Second Signal line
`D- of the USB chip 12 in the keyboard 11, respectively. The
`Switching means 4 also includes a relay actuator 4C actuated
`when electrical power is Supplied thereto from the main
`electrical power 5. The first and the second relay contacts 4A
`15
`and 4B can be simultaneously actuated and Switched by the
`relay actuator 4C of the Switching means 4.
`The main power Supply 5 includes a power Supply Switch
`5A. When the Switch 5A is Switched on by a person or when
`a predetermined Signal is input to the power-on terminal 5a,
`electrical power is Supplied to the interior of the host
`computer 1.
`The Sub-power Supply 6 is, for example, a battery, and
`Supplies electrical power to the first and the Second com
`paring means 3A and 3B of the wake-up means 3 and the
`25
`AND circuit 8. Outputs of the main power Supply 5 and the
`sub-power supply 6 are connected to diodes D1 and D2 in
`an OR connection. They are also connected to a power
`supply input terminal Vcc of the USB chip 12 in the
`keyboard 11 through the connector terminal 1a and the USB
`cable 9. In other words, at least one of the main power
`Supply 5 and the Sub-power Supply 6 Supplies electrical
`power to the keyboard 11. A GND terminal of the keyboard
`11 is grounded to a ground line at the host computer 1 side
`through the connector terminal 1a and the USB cable 9.
`Table 1 shows the USB standard signal line states when
`the host computer 1 is Set in the Suspend mode.
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`TABLE 1.
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`Low Speed
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`Full Speed
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`Unconnected
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`D-
`D-
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`L (Hi-Z)
`H (Hi-Z)
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`H
`L (Hi-Z)
`
`L (Hi-Z)
`L (Hi-Z)
`
`6
`the main power Supply 5 is stopped. In this case, an
`operating System (OS) of the host computer 1 is not turned
`on. Therefore, the operation of the USB chip 2 is stopped.
`Since actuating electrical current is not Supplied to the
`relay actuator 4C of the Switching means 4, the connecting
`terminals 4A1 and 4A3 of the first relay contact 4A are
`connected, and the connecting terminals 4B1 and 4B3 of the
`Second relay contact 4B are also connected. Therefore, the
`first signal lines D+ of the host computer 1 and the keyboard
`11 are not connected to each other, and the Second Signal
`lines D- of the host computer 1 and the keyboard 11 are not
`connected to each other. The first signal line D+ and the
`Second Signal line D- of the keyboard 11 are connected to
`the first input terminals 3A1 and 3B1 of the wake-up means
`3, respectively. The first signal line D+ and the Second Signal
`line D- of the host computer 1 are pulled down due to a
`predetermined resistance of 15 kS2 as a result of the USB
`standards. When the first signal lines D+ of the host com
`puter 1 and the keyboard 11 are not connected to each other,
`and the Second Signal lines D- of the host computer 1 and
`the keyboard 11 are not connected to each other, the first
`Signal line D+ and the Second Signal line D- at the host
`computer 1 side are Set in the L level.
`From the Sub-power Supply 6, the output Voltage V is
`applied to the wake-up means 3. In this case, the amount of
`electrical current Supplied to the wake-up means 3 is equal
`to or greater than 500 uA, and the mode is Set in a low
`electrical power mode lust as in the case where the host
`computer 1 is Set in the Suspend mode. The output voltage
`V from the sub-power supply 6 is also applied to the
`keyboard 11 through the diode D2, the connector terminal
`1a, the USB cable 9 and the power Supply input terminal
`Vcc of the USB chip 12.
`When the power-on key on the keyboard 11 is operated,
`or when a plurality of keys on the keyboard 11 are operated
`at the same time, predetermined signals are output towards
`the host computer 1 through the first Signal line D+ and the
`second signal line D- of the USB chip 12 in the keyboard
`11. These predetermined signals are generated by the afore
`mentioned 8-bit microcontroller (not shown), which is a
`controlling means (or Signal-generating means) at the key
`board 11 side. The first signal line D+ and the second signal
`line D- are in a fourth mode in which both signal lines D+
`and D- are in the H state. The pulse width and the pulse
`Voltage of the predetermined Signals are, for example, 50 ms
`and 3 volts, respectively.
`The fourth mode of first Signal line D+ and Second Signal
`line D- in which both of them are in the H level state is not
`shown in Table 1 because it is not a USB standard mode.
`Taking into account that the data transfer speed of the USB
`is measured in nanoseconds (insec), it can be said that a pulse
`width of 50 ms is very large. Therefore, even when fourth
`mode signals (H level signals with a pulse width of 50 ms)
`are Set as Signals that are not USB Standard Signals, and then
`transmitted to first signal line D+ and Second Signal line D-,
`they can be easily distinguished from USB standard data
`Signals.
`When such fourth mode signals are transmitted from the
`keyboard 11, they are input to the USB cable 9, the con
`nector terminal 1a, and the first input terminal 3A1 of the
`first comparing means 3A and the first input terminal 3B1 of
`the Second comparing means 3B of the wake-up means 3
`through the first relay contact 4A and the Second relay
`contact 4B of the Switching means 4, respectively. In other
`words, the fourth mode signals are input to the first input
`terminal 3A1 of the first comparing means 3A and the first
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`As shown in Table 1, according to the USB standards,
`there are three Signal line State modes. They are a lower
`speed mode (hereinafter referred to as “LS mode”) or a first
`mode; a full speed mode (hereinafter referred to as “FS
`mode’) or a second mode; and an unconnected mode or a
`50
`third mode. In the LS mode, the data transfer speed is 1.5 M
`bits/s. In the FS mode, the data transfer speed is 12 Mbits/s.
`In the unconnected mode, the USB cable 9 is in an uncon
`nected State.
`When the host computer 1 is set in the suspend mode, first
`Signal line D+ and Second Signal line D- in the LS mode are
`in an L (Hi-Z or high-impedance) State and in an H (high
`level) state, respectively. In the FS mode, they are in the H
`State and in the L (Hi-Z) State, respectively. In the uncon
`nected mode, they are both in the L (Hi-Z) state. The state
`in which both of these first and the second signal lines D+
`and D- are in the H state is not a USB standard state.
`A description will now be given of the operation of the
`apparatus for turning on a computer power Supply, which
`has the above-described Structure.
`When the power supply Switch 5A of the main power
`Supply 5 is Set in an off State, electrical power Supply from
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`input terminal 3B1 of the second comparing means 3B. The
`first and the Second comparing means 3A and 3B make a
`comparison between the Voltages of the fourth mode signals
`and the standard voltage 7 (1.5 volts). Only when the fourth
`mode Signals have a Voltage greater than the Standard
`Voltage 7 are the H signals output from the output terminals
`3A3 and 3B3. In other words, the first and the second
`comparing means 3A and 3B act as comparators.
`When the H signals are output from the output terminal
`3A3 of the first comparing means 3A and the output terminal
`3B3 of the second comparing means 3B at the same time, the
`AND circuit 8 which has received these signals also outputs
`the H signals with the pulse width of 50 msec. When the H
`Signals are input to the power-on terminal 5a of the main
`power Supply 5, the main power Supply 5 is turned on.
`When the main power Supply 5 is turned on, electrical
`power is applied to the host computer 1, the USB chip 2, the
`relay actuator 4C of the Switching means 4, etc. When a
`predetermined amount of actuating electrical current is
`Supplied from the main power Supply 5 to the relay actuator
`4C of the Switching means 4, the connecting terminals 4A2
`and 4A3 of the first relay contact 4A are connected together,
`and the connecting terminals 4B2 and 4B3 of the second
`relay contact 4B are connected together. Therefore, the first
`signal lines D+ of the host computer 1 and the keyboard 11,
`and the second lines D- of the host computer 1 and the
`keyboard 11 are connected together, making it possible to
`allow transmission of Signals between the host computer 1
`and the keyboard 11.
`Since the operating System existing as a resident program
`in the host computer 1 is Started up as a result of Supplying
`electrical power to the host computer 1, the host computer
`1 is started in order to Set an environment that allows an
`input operation to be performed at the keyboard 11.
`The power Supply turn-on apparatus of the present inven
`tion can be powered down when the keyboard 11 is not
`operated for a long time.
`For example, when communication is not carried out from
`the keyboard 11 to the host computer 1, application of H
`40
`(high level) Signals is continued from the aforementioned
`8-bit microcomputer (which is a controlling means or a
`Signal-generating means disposed at the keyboard 11 Side) to
`the first signal line D+ and the Second Signal line D- of the
`USB chip 2 of the host computer 1 through the USB chip 12.
`When a predetermined key on the keyboard 11 is operated,
`L Signals are output from the 8-bit microcomputer to first
`Signal line D+ and Second Signal line D- for, for example,
`25 m.sec. When the L signals are applied to the USB chip 2,
`the USB chip 2 is put in a state that is identical to the
`pull-down state that occurs when the keyboard 11 is not
`connected. This state of the USB chip 2 is detected at the
`host computer 1 side, and the main power Supply is turned
`off.
`AS can be understood from the foregoing description,
`when the main power Supply of the host computer is turned
`off, that is, when it is in the power-off State, and the input
`device, Such as a keyboard, is operated, the host computer
`can be started.
`It is possible to add value to a computer by allowing a host
`computer to be started by making use of a combination of
`signals that are not USB standard signals at the USB
`interface.
`What is claimed is:
`1. An apparatus for turning on a computer power Supply,
`comprising:
`
`50
`
`8
`
`a host computer;
`an input device connected to the host computer through an
`interface, the interface Supplying data and power to the
`input device;
`a main power Supply to Supply power to the host com
`puter; and
`a Sub-power Supply to Supply power to the input device
`when the main power Supply is in an off State;
`wherein the host computer comprises wake-up means for
`turning on the main power Supply to power the host
`computer as a result of a predetermined operation
`performed at the input device when the main power
`Supply is in the off State,
`wherein the apparatus further comprises Switching means
`disposed at the interface, wherein when the main power
`Supply is in an on State, the Switching means connects
`a signal line of the host computer and a signal line of
`the input device, and wherein when the main power
`Supply is in the off State, the Switching means Switches
`connection So that the wake-up means and the Signal
`line of the input device are connected together; and
`wherein when the main power Supply is in the off State,
`and the predetermined operation is performed at the
`input device, a Start-up signal generated by the wake-up
`means is applied to the main power Supply to turn on
`the main power Supply, whereby the Switching means
`Switches connections So that the Signal line of the host
`computer and the Signal line of the input device are
`connected together,
`wherein the interface comprises four signal lines: a uni
`Versal Serial bus Standard power Supply line, a first
`Signal line, a Second Signal line, and a ground line; and
`wherein the wake-up means comprises first comparing
`means for detecting Whether a Value of the first Signal
`line is at least a predetermined Standard value, Second
`comparing means for detecting whether a value of the
`Second Signal line is at least the predetermined Standard
`value, and an AND circuit logically ANDing the first
`comparing means and the Second comparing means,
`with the main power Supply being turned on when an
`output of the AND circuit reaches a predetermined
`value, and
`wherein when the predetermined operation is performed
`at the input device, H Signals of a first predetermined
`pulse width are output to both the first Signal line and
`the Second Signal line, after which the H Signals with a
`Second predetermined pulse width of at least the first
`predetermined pulse width are output from the AND
`circuit to turn on the main power Supply.
`2. An apparatus for turning on a computer power Supply
`according to claim 1, wherein the first predetermined pulse
`width is Substantially greater than a Standard pulse width for
`Signals transmitted between the host computer and input
`device through the interface when the host computer is the
`main power Supply is turned on.
`3. An apparatus for turning on a computer power Supply
`according to claim 1, wherein the predetermined operation
`consists of performing a plurality of individual operations at
`the input device.
`4. An apparatus for turning on a computer power Supply
`according to claim 1, wherein the input device is a keyboard
`and the predetermined operation consists of activating a
`plurality of different keys on the keyboard.
`5. An apparatus for turning on a computer power Supply
`according to claim 1, wherein the predetermined operation
`consists of performing a single operation at the input device.
`6. An apparatus for turning on a computer power Supply
`according to claim 1, wherein the input device is a keyboard
`
`US 6,625,738 B1
`
`1O
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`15
`
`25
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`35
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`45
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`55
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`60
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`65
`
`Petitioners Ex. 1013
`IPR USP 7,239,111
`Page 6