JP4487599B2 - Peripheral device and power switching method for peripheral device - Google Patents

Description

  The present invention relates to a peripheral device and a power supply switching method for the peripheral device, and more particularly to a peripheral device that can be switched to a power saving state, such as a printer or a scanner connected to a personal computer or a network device, and the peripheral device. The present invention relates to a power switching method.

  In recent years, a single peripheral device is provided with a plurality of interfaces such as USB (Universal Serial Bus), IEEE1394, and LAN interface (Ethernet (R)). In addition, an interface has been created that supports a remote wake-up function in which only the peripheral device is turned on even when the host computer is turned off, and the host computer is turned on from the peripheral device.

  Peripheral devices are also provided with an interface such as an IEEE802.3u network to which a network cable without power supply is always connected. In addition, a network interface that supports the interface standard (IEEE802.3af) that can always supply power to peripheral devices from network devices such as network hubs and switches regardless of whether the host computer is powered on or off is also included in the peripheral devices. It has come to be provided.

  For peripheral devices such as printers and scanners equipped with these interfaces, the main printer power supply (AC100V) is also turned off when the connected host computer is turned off from the viewpoint of power saving. It is effective.

As a conventional technique, the power supply line of the interface is monitored, and when the host computer is turned on and the power supply line is in the active state, the printer main power (AC100V) is turned on, A device is known that turns off the main power of a printer when the power is turned off and the power supply line is in an inactive state (Patent Document 1).
JP 2002-108518 A

  However, since the peripheral device is provided with various interfaces for connecting the host computer, in the case where the power supply line of the interface is an interface that does not become active or inactive depending on the power of the host computer, As in the prior art, there is a problem that the power status of the host computer cannot be recognized correctly if only the interface power supply line is monitored.

  Further, Patent Document 1 describes that the power status of the host computer can be grasped by monitoring only the data signal line of the interface. However, in Patent Document 1, the monitored signal line is active. A technique is described in which the power supply of the peripheral device is turned on in the state, and the power supply of the peripheral device is turned off when the signal line is in an inactive state. Here, the data signal line becomes active only when the peripheral device is used. Therefore, when the data signal line is monitored by the technique described in Patent Document 1 and the peripheral device is turned on / off according to the state of the signal line, the host computer is turned on and the peripheral device is turned on. In spite of the possibility of using the device, the peripheral device is turned off except when the peripheral device is used, so that every time the peripheral device is used, the peripheral device needs an initial operation. There was a problem.

  The present invention has been made to solve the above-described problems. By monitoring the data signal line in addition to the power supply line of the interface, the peripheral device is a host corresponding to the interface provided in the peripheral device. An object of the present invention is to obtain a peripheral device that can correctly recognize the state of the computer and can be switched to a power saving state when there is no possibility that the host computer uses the peripheral device.

  In order to achieve the above object, the first aspect of the present invention is any one of an operable state in which power from a main power source is supplied and a power saving state in which power from the main power source is reduced below the operable state. An input / output interface capable of supplying power from the host and capable of transmitting and receiving data to and from the host; and the input / output interface. It monitors whether power is supplied from the host to the output interface and whether at least one of transmission and reception of data is executed with the host, and power is supplied from the host to the input / output interface. The peripheral device is set in the operable state, and data is transmitted to and received from the host in the operable state. State not performing at least one of when a predetermined time or longer, and the switching means switches said peripheral device from said operating state to the power-saving state, in which the configuration of the.

  The input / output interface of the present invention can supply power from the host and can execute at least one of data transmission and reception with the host.

  The switching means monitors whether power is supplied from the host to the input / output interface and whether at least one of data transmission and reception is executed with the host, and the power from the host is input. When being supplied to the output interface, power from the main power supply is supplied by making the peripheral device operable. When the state in which at least one of data transmission and reception with the host has not been executed in the operable state continues for a predetermined time or longer, the switching unit switches the peripheral device from the operational state to the power saving state. By switching to, the power supplied from the main power supply is reduced.

  As described above, according to the present invention, even when power is supplied from the host to the input / output interface, at least one of transmission and reception is not performed between the host and the input / output interface. Can switch to a power saving state when there is no possibility of using a peripheral device. Therefore, it is possible to correctly recognize when the host does not have the possibility of using the peripheral device and optimally switch to the power saving state.

  Note that, according to the present invention, when the power supply line becomes active in the power saving state, the power saving state can be switched to the operable state.

  The second aspect of the invention switches to one of an operable state in which power from the main power source is supplied and a power saving state in which the power from the main power source is reduced below the operable state. An input / output interface capable of supplying power from the host and capable of transmitting / receiving data to / from the host; and the input / output interface from the host to the input / output interface. When power is supplied and when at least one of data transmission and reception is executed with the host is monitored, and power is not supplied from the host to the input / output interface In addition, the peripheral device is set in the power saving state, and at least one of data transmission and reception with the host is executed in the power saving state. When a switching means switching said peripheral device from the power-saving state to the operating state, in being configured.

  The switching means of the present invention reduces the power supplied from the main power supply from the operable state by putting the peripheral device in the power saving state when the power from the host is not supplied to the input / output interface. When at least one of data transmission and reception with the host is executed in the power saving state, the switching means switches power from the main power source by switching the peripheral device from the power saving state to the operable state. Supply.

  As described above, according to the present invention, even when power is not supplied from the host to the input / output interface, when at least one of transmission and reception is performed between the host and the input / output interface, that is, the peripheral device uses it. The peripheral device can be switched from the power saving state to the operable state when there is a possibility of being activated. Therefore, the host can correctly recognize when there is a possibility of using the peripheral device and can switch to the operable state.

  In the peripheral devices according to the first and second inventions, the power saving state can be a state in which the power of the main power source is supplied only to the input / output interface and the switching means.

  According to a third aspect of the present invention, it is possible to switch to one of an operable state in which power from the main power source is supplied and a power saving state in which the power from the main power source is reduced below the operable state. An input / output interface capable of transmitting and receiving data including address data unique to the peripheral device to and from the host, and an address for storing the address data transmitted from the host And monitoring whether the address data is stored in the storage unit and the address storage unit, and when at least one of the address data is stored in the address storage unit, the peripheral device is brought into the operable state. And when the address data is not stored in the operable state for a predetermined time or longer, Is constructed the device from the operating state includes a switching means for switching to the power saving state.

  The input / output interface of the present invention can execute at least one of transmission and reception of data including address data unique to the peripheral device with the host. The address storage unit stores address data unique to the peripheral device transmitted from the host. The switching means monitors whether the address data is stored in the address storage unit, and switches the peripheral device to an operable state when at least one address data is stored in the address storage unit. Supply power from.

  In the operable state, the switching means switches the power supplied from the main power source from the operable state by switching the peripheral device to the power saving state when the state in which no address data is stored continues for a predetermined time or more. Also reduce.

  As described above, according to the present invention, when the peripheral device specific address data transmitted from the host to the input / output interface is stored in the address storage unit, the host recognizes when there is no possibility of using the peripheral device. The peripheral device can be switched to the power saving state.

  According to a fourth aspect of the present invention, it is possible to switch to one of an operable state in which power from the main power supply is supplied and a power saving state in which the power from the main power supply is reduced below the operable state. An input / output interface capable of supplying power from a host and capable of transmitting and receiving data including address data unique to the peripheral device to and from the host; An address storage unit for storing the address data transmitted from the host; whether the address data is stored in the address storage unit; and whether power is supplied to the input / output interface from the host. When the power is supplied from the host to the input / output interface, the peripheral device is put into the operable state. Both are configured with switching means for switching the peripheral device from the operable state to the power saving state when the state in which the address data is not stored continues for a predetermined time or longer in the operable state. .

  The input / output interface according to the present invention can supply power from the host and can execute transmission and reception of data including address data unique to the peripheral device with the host. The switching unit monitors whether or not address data is stored in the address storage unit and whether or not power is supplied from the host to the input / output interface, and the power from the host is supplied to the input / output interface. In this case, power from the main power supply is supplied by switching the peripheral device to an operable state. In the operable state, the switching means operates the power supplied from the main power source by switching the peripheral device to the power saving state when it is determined that the state in which no address data is stored continues for a predetermined time or more. Reduce than possible.

  As described above, according to the present invention, even when power is supplied from the host to the input / output interface, when the address data transmitted from the host is not stored in the address storage unit for a predetermined time or longer, that is, the host When there is no possibility of using the peripheral device, the peripheral device can be switched to the power saving state. Accordingly, it is possible to correctly recognize when the host is not likely to use the peripheral device, and to optimally switch the peripheral device to the power saving state.

  In the peripheral devices according to the third and fourth inventions, the power saving state can be a state in which the power of the main power source is supplied only to the input / output interface, the address storage unit, and the switching means.

  The address data may be IP address data.

  As the input / output interface, a USB, IEEE 1394, or LAN interface can be used, and the host is not limited to the host computer, but can be a network device (hub or switch).

  According to a fifth aspect of the present invention, there is provided a peripheral device power switching method comprising an input / output interface capable of supplying power from a host and capable of transmitting and receiving data to and from the host. When switching the power supply of a peripheral device that can be switched to one of an operable state in which power from the power supply is supplied and a power saving state in which the power from the main power supply is reduced below the operable state. Monitoring whether or not power is supplied from the host to the input / output interface and whether at least one of transmission and reception of data is executed with the host; When power is supplied from the host, the peripheral device is put into the operable state, and in the operable state, the peripheral device is decoupled from the host. When the state is not running at least one of transmission and reception of data continues for a predetermined time or more, it is possible to switch between the peripheral device from the operating state to the power saving state.

  A power supply switching method for a peripheral device according to a sixth aspect of the present invention comprises an input / output interface capable of supplying power from a host and capable of at least one of data transmission and reception with the host. When switching the power supply of a peripheral device that can be switched to one of an operable state in which power from the power supply is supplied and a power saving state in which the power from the main power supply is reduced below the operable state. Monitoring whether or not power is supplied from the host to the input / output interface and whether at least one of transmission and reception of data is executed with the host; When power is not supplied from the host, the peripheral device is set in the power saving state, and data is transferred to and from the host in the power saving state. Transmission and when executing at least one of reception, it is possible to switch between the peripheral device from the power-saving state to the operational state.

  According to a seventh aspect of the present invention, there is provided a power supply switching method for a peripheral device, an input / output interface capable of transmitting and receiving data including address data unique to the peripheral device to and from a host, and the host device An address storage unit for storing the address data, and any of an operable state in which power from a main power supply is supplied and a power saving state in which power from the main power supply is reduced below the operable state. When switching the power supply of a peripheral device that can be switched to one of the states, it is monitored whether the address data is stored in the address storage unit, and at least one of the address data is stored in the address storage unit Sometimes, the peripheral device is brought into the operable state, and the address data is stored in the operable state. It is when the state is not that continues for a predetermined time or longer, it is possible to switch between the peripheral device from the operating state to the power saving state.

  According to an eighth aspect of the present invention, there is provided a power supply switching method for a peripheral device, wherein power can be supplied from a host, and at least one of transmission and reception of data including address data unique to the peripheral device with the host. An input / output interface capable of operating and an address storage unit for storing the address data transmitted from the host, an operable state in which power from a main power supply is supplied, and the power from the main power supply can be operated Whether or not the address data is stored in the address storage unit and the input / output interface when switching the power supply of the peripheral device that can be switched to any one of the power saving states supplied by reducing the state. And whether or not power is supplied from the host to the I / O interface. The peripheral device is put into the operable state, and when the state in which the address data is not stored continues for a predetermined time or more in the operable state, the peripheral device is moved from the operable state. The power saving state can be switched.

  As described above, according to the peripheral devices of the first and third inventions, in addition to whether power is supplied from the host to the input / output interface, at least one of transmission and reception with the host Is switched to the power saving state by monitoring whether or not address data specific to the peripheral device transmitted from the host is stored in the address storage unit. When the host status is correctly recognized and there is no possibility that the host uses the peripheral device, the power saving state can be optimally switched.

  In addition, according to the peripheral devices of the second and fourth inventions, there is a possibility that the host can use the peripheral device by correctly recognizing the situation of the host, corresponding to the input / output interface provided in the peripheral device. In some cases, there is an effect that the power saving state can be switched to the operable state.

  According to the power supply switching method of the peripheral device of the fifth and seventh inventions, the host can use the peripheral device by properly recognizing the host status corresponding to the input / output interface provided in the peripheral device. When there is no possibility, the effect that the peripheral device can be optimally switched to the power saving state can be obtained.

  Further, according to the power switching method of the peripheral device of the sixth invention and the eighth invention, it corresponds to the input / output interface provided in the peripheral device, correctly recognizes the status of the host, and the host uses the peripheral device. When there is a possibility, the peripheral device can be switched from the power saving state to the operable state.

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

  In the first embodiment of the present invention, the first invention is applied to a printer.

  As shown in FIG. 1, a printer 10 as a peripheral device includes an interface circuit unit 22, an overall control circuit unit 28, a printer mechanism unit 36, and an input / output interface necessary for communicating with a host computer 12 as a host. A power switching logic unit 38 is provided as switching means.

  The interface circuit unit 22 includes an interface controller 20, and the interface controller 20 performs data transmission and reception with the host computer 12 by a predetermined procedure (protocol), and is mainly configured by a logic circuit.

  The interface circuit unit 22 is connected to the interface circuit 18 of the host computer 12 through one power supply line 16. Further, the interface controller 20 of the interface circuit unit 22 is connected to the interface circuit 18 of the host computer 12 by N (N is an integer) data signal lines 14 in order to communicate with the host computer 12. The power supply line 16 is provided to supply power from the host computer 12 to the printer 10. When power is supplied, the power supply line 16 is in an active state, and when power is not supplied, The supply line 16 becomes inactive. The data signal line 14 is used for the host computer 12 and the printer 10 to transmit and receive control signals and data. The data signal line 14 includes data signal lines, control signal lines, and the like. The interface circuit unit 22 is an interface that switches the power supply line 16 to an active state or an inactive state according to the power status of the host computer such as USB or IEEE1394, or the power supply line 16 regardless of the power status of the host computer. Is an interface circuit part of an interface in which becomes active.

  The overall control circuit unit 28 includes a CPU 24 that controls the entire printer and a memory 26 that is used for program storage and work, and the CPU 24 and the memory 26 are connected to each other.

  The CPU 24 is connected to the interface controller 20 via an IO-Bus (input / output bus) 42 in order to exchange necessary data with the interface controller 20.

  The printer mechanism unit 36 includes a fuser 30, a motor 32, and a sensor 34, which require a relatively large current.

  The data switching line 38 is connected to the data signal line 14 and the power supply line 16.

  As shown in FIG. 2, the power supply switching logic unit 38 mainly includes a NOR circuit (negative OR circuit) 60, a counter 62, an oscillator (OSC) 64, a NOT element (negative element) 66, an OR circuit (OR circuit). 68, a switch 70 realized by a transistor switch or the like, and a main power supply line 78.

_N signal lines from the data signal line 14 ₁ to the data signal line 14 _N are connected to an input terminal of the NOR circuit 60. The counter 62 includes an EN terminal (enable terminal) and a CLK terminal (clock terminal), and the EN terminal is connected to the output terminal of the NOR circuit 60. The CLK terminal is connected to the output terminal of the oscillator 68 so that a clock signal is input. When an active signal (HIGH) is input from the NOR circuit 60 to the EN terminal, the counter 62 starts counting. When counting up from the initial value (= 1) to a predetermined value, the counter 62 outputs an active signal. During other periods, the counter 62 outputs an inactive signal (LOW). If an inactive signal is input to the EN terminal during the counting operation, the value of the counter 62 is reset to the initial value.

  The power supply line 16 is connected to the input terminal of the NOT element 66, and the output terminal of the NOT element 66 is connected to the input terminal of the OR circuit 68. The output terminal of the counter 62 is also connected to the input terminal of the OR circuit 68, and the output terminal of the OR circuit 68 is connected to the input terminal of the switch 70.

  The switch 70 is turned on when an inactive signal is input from the OR circuit 68, and the switch 70 is turned off when an active signal is input.

  Next, the operation of the first embodiment will be described.

  First, in the power switching logic unit 38, when the power from the power supply line 16 is stopped, the power supply line 16 is in an inactive state, the NOT element 66 outputs an active state signal, and the OR circuit 68 is Outputs an active signal. As a result, the switch 70 is turned off, the main power supply line 78 is disconnected, and the power from the main power supply 40 to the interface circuit unit 22, the overall control circuit unit 28, and the printer mechanism unit 36 is stopped.

  When power is supplied from the power supply line 16, the power supply line 16 is in an active state, and an inactive signal is output from the NOT element 66. Further, while the counter 62 does not start the counting operation, the counter 62 outputs an inactive signal. These inactive signals are input to the OR circuit 68, and the OR circuit 68 outputs an inactive signal. The switch 70 to which the inactive signal is input is turned on, the main power supply line 78 is connected, and power is supplied from the main power supply 40 to the interface circuit unit 22, the overall control circuit unit 28, and the printer mechanism unit 36.

When power is supplied from the power supply line 16 and the switch 70 is turned on, if _N lines from the data signal line 14 ₁ to the data signal line 14 _N are in an inactive state, NOR An active signal is output from the circuit. This active signal is input to the EN terminal of the counter 62, and the counter 62 starts counting. The counter 62 counts up unless an inactive signal is input to the EN terminal of the counter 62. When the counter 62 counts up to a predetermined value, the counter 62 outputs an active signal. The active state signal is output from the OR circuit 68 to which the active state signal is input, the switch 70 to which the active state signal is input is turned off, and the interface circuit unit 22 and the overall control circuit from the main power supply 40 are turned off. The power to the unit 28 and the printer mechanism unit 36 is stopped.

  Therefore, even if power is supplied from the power supply line 16, if the host computer 12 does not execute at least one of transmission and reception of data between the host computer 12 and the printer 10 for a predetermined time or longer, the host computer 12 It can be determined that there is no possibility of using the printer 10, and the power consumed by the printer 10 can be eliminated.

  Next, a second embodiment of the present invention will be described. In the second embodiment, the second invention is applied to a printer. In the second embodiment, in the first embodiment, the power switching logic unit includes the power switching logic unit 50 instead of the power switching logic unit 38. Further, as the interface circuit unit 22, an interface circuit unit of an interface in which the power supply line 16 becomes inactive regardless of the power state of the host computer 12 is applied. The power switching logic unit 50 is shown in FIG.

  The difference from the power switching logic unit 38 of the first embodiment is that the input terminal of the switch 90 is connected to the output terminal of an AND circuit (logical product circuit) 88 instead of the OR circuit.

  The operation of the second embodiment will be described below.

  First, in the power supply switching logic unit 50, when power is not supplied from the power supply line 16, the power supply line 16 is in an inactive state, and an active state signal is output from the NOT element 86.

Then, in this state, all N signal lines from the data signal line 14 ₁ to the data signal line 14 _N is If it is set to the inactive state, the signal in the active state is outputted from the NOR circuit. When the signal in the active state is input to the EN terminal of the counter 82, the counter 82 starts a count operation, and counts up unless the signal in the inactive state is input to the EN terminal of the counter 82. When counting up to the value, the counter 82 outputs an active signal. The two active signals are input to the AND circuit 88, and the AND circuit 88 outputs an active signal. The switch 90 to which the active state signal is input is turned off, the main power supply line 98 is disconnected, and the power from the main power supply 40 to the interface circuit unit 22, the overall control circuit unit 28, and the printer mechanism unit 36 is stopped. . Accordingly, if at least one of data transmission and reception with the host computer 12 has not been executed for a predetermined time or longer, the host computer 12 determines that there is no possibility of using the printer 10, and the printer 10 Power consumption can be eliminated.

Then, no power is supplied from the power supply line 16, when the printer 10 is in a power saving state, at least one active among the N signal lines from the data signal line 14 ₁ to the data signal line 14 _N In the state, the NOR circuit 80 outputs an inactive signal. The EN terminal of the counter 82 receives the inactive signal, and the reset counter 82 outputs the inactive signal. Since the power supply line 16 is in an inactive state, an active state signal is output from the NOT element 86. The AND circuit 88 receives an active state signal and an inactive state signal. The AND circuit 88 outputs an inactive state signal, and the inactive state signal is input to the switch 90. As a result, the switch 90 is turned on, the main power supply line 98 is connected, and power is supplied from the main power supply 40 to the interface circuit unit 22, the overall control circuit unit 28, and the printer mechanism unit 36.

  Therefore, even if power is not supplied from the power supply line 16, as long as at least one of transmission and reception is executed with the host computer 12, the main power supply line is not disconnected, and the interface circuit unit is connected from the main power supply. 22, power is supplied to the overall control circuit unit 28 and the printer mechanism unit 36.

  The power supply switching logic unit 38 of the first embodiment and the power supply switching logic unit 50 of the second embodiment can be provided in the printer 10 at the same time. In that case, the interface circuit unit according to the first embodiment and the interface circuit unit according to the second embodiment are provided, and the power switching logic unit 38 and the power switching logic unit 50 are provided for each interface circuit unit. Install. And the switch of each power supply switching logic part should just be provided in parallel with the main power supply line.

  In the third embodiment relating to the present invention, the third invention is applied to a printer. As shown in FIG. 4, an address register 108 as an address storage unit is provided in the interface controller 110. The address register 108 stores an address unique to the printer 100 notified from the host computer 102.

  The address unique to the printer 100 notified from the host computer 102 is created so that a plurality of peripheral devices can be connected on the same bus in the bus type interface, and the host computer 102 distinguishes each peripheral device. For this purpose, it is a unique address of the peripheral device notified from the host computer 102. With this address, the host computer 102 can recognize which peripheral device performs data transmission and reception.

  The interface controller 110 is connected to the CPU 114 via the IO-Bus 132, and the CPU 114 can monitor the state of the address register 108 provided in the interface controller 110. The CPU 114 is connected to the power supply switching logic unit 128 via a control signal line 134 including an address signal line and a data signal line, and the CPU 114 can send a control signal to the power supply switching logic unit 128. Here, the CPU 114 and the power supply switching logic unit 128 correspond to the switching means of the third invention.

  Note that, in the third embodiment, unlike the first embodiment, the data signal line 104 and the power supply line 106 are not connected to the power switching logic unit 128.

  As shown in FIG. 5, the power switching logic unit 128 mainly includes a register 152, a switch 154, and a main power line 156. The output terminal of the register 152 is connected to the input terminal of the switch 154. The switch 154 connects or disconnects the main power line 156. The register 152 is connected to the CPU 114 via the control signal line 134.

  Next, the operation of the third embodiment will be described with reference to the flowchart of FIG.

  When the printer 100 is in an operable state, in step 300, the CPU 114 monitors the address register 108 by executing a program stored in the memory 116, and there is a state in which no address data is stored in the address register 108. It is determined whether it has continued for a predetermined time. If the result in step 300 is negative, the state of the printer 100 is left as it is, and step 300 is repeatedly executed until the result in step 300 is positive. The power of the host computer 102 is turned off, the reset signal from the interface circuit 138 of the host computer 102 to the address register 108 becomes active, and the address notified from the host computer 102 stored in the address register 108 is the address register. It is deleted from 108. Then, if the state in which no address data is stored in the address register 108 continues for a predetermined time, the result is affirmative in step 300 and the process proceeds to step 302. In step 302, the CPU 114 controls each unit of the apparatus and executes a termination process for entering a power saving state. In step 304, the CPU 114 sends a signal for writing a predetermined digital value (for example, “1”) to the register 152. When a predetermined digital value is written in the register 152, the register 152 outputs an active signal, and as a result, the switch 154 is turned off. Then, power supply from the main power supply 130 to the interface circuit unit 112, the overall control circuit unit 118, and the printer mechanism unit 126 is stopped.

  In the next step 306, the CPU 114 executes a program stored in the memory 116 to determine whether or not address data is stored in the address register 108. If negative in step 306, step 306 is repeated until affirmative. When the host computer 102 is powered on, the host computer 102 notifies the printer 100 of an address specific to the printer 100, and this address is stored in the address register 108 and affirmed in step 306. In step 308, the CPU 114 sends a signal for resetting the register 152 to the register 152. When the register 152 is reset, the register 152 outputs an inactive signal, so that the switch 154 is turned on. Then, power is supplied from the main power supply 130 to the interface circuit unit 112, the overall control circuit unit 118, and the printer mechanism unit 126.

  Accordingly, if a state in which no address data is stored in the address register 108 continues for a predetermined time, the host computer 102 determines that there is no possibility of using the printer 100, and the power supply switching logic unit 128 puts the printer 100 into a power saving state. By switching to, the power consumed by the printer 100 can be eliminated.

  The fourth embodiment of the present invention will be described. In the fourth embodiment, the fourth invention is applied to a printer. The fourth embodiment is different from the power switching logic unit 128 of the third embodiment in that a predetermined digital value is written by the CPU 114 in the register 162. In addition to the state, a power supply switching logic unit 172 that switches the printer 100 to the power saving state by monitoring the state of the power supply line 106 is provided. The power supply line 106 is connected to the power switching logic unit 172.

  As shown in FIG. 7, the power supply switching logic unit 172 is configured to further include a NOT element 164 and an OR circuit 166 in addition to the power supply switching logic unit 128 of FIG. 5.

  The output terminal of the register 162 is connected to the input terminal of the OR circuit 166. The power supply line 106 is connected to the input terminal of the NOT element 164, and the output terminal of the NOT element 164 is connected to the input terminal of the OR circuit 166. The output terminal of the OR circuit 166 is connected to the input terminal of the switch 168.

  The operation of the fourth embodiment will be described below.

  First, in the power supply switching logic unit 172, when power is supplied from the power supply line 106, the power supply line 106 is activated, and a signal in an inactive state is output from the NOT element 164. When address data is stored in the address register 108, the register 162 is reset by the CPU 114, and an inactive signal is output from the register 162. These inactive signals are input to the OR circuit 166, and the OR circuit 166 outputs an inactive signal. The switch 168 to which the inactive signal is input is turned on, the main power supply line 170 is connected, and power is supplied from the main power supply 130 to the interface circuit unit 112, the overall control circuit unit 118, and the printer mechanism unit 126.

  When power is supplied from the power supply line 106 and the switch 172 is on, if the address data is not stored in the address register 108 for a predetermined time, the CPU 114 stores the predetermined value in the register 162. Is written, and an active state signal is output from the register 162. The active signal is input to the OR circuit 166, and the active signal is output from the OR circuit 166. The switch 168 to which the signal of the active state is input is turned off, and the power supply from the main power supply 130 to the interface circuit unit 112, the overall control circuit unit 118, and the printer mechanism unit 126 is stopped.

  Therefore, even if power is supplied from the power supply line 106, if the address data is not stored in the address register 108 for a predetermined time or longer, the host computer 102 determines that there is no possibility of using the printer 100, Electric power consumed by the printer 100 can be eliminated.

  In the above embodiment, the circuit diagram for cutting the main power supply line leading to all the circuits in the power saving state is shown. However, it is not always necessary to stop the power supply from the main power supply, for example, some circuits. It is also possible to supply power from the main power source only. In addition, although not shown, the power necessary for the power switching logic unit is supplied from the main power.

  In the fifth embodiment of the present invention, the fifth invention is applied to a printer. As shown in FIGS. 8 and 9, in the fifth embodiment, the power supply part in the power saving state is limited to only the interface circuit unit 212 and the power supply switching logic unit 228 in the first embodiment. It is.

  The power supply switching logic unit 228 in the fifth embodiment branches the main power supply line 268 into two as shown in FIG. One main power supply line is provided with a switch 260, and the main power supply line is connected to the overall control circuit unit 218 and the printer mechanism unit 226. The other main power supply line is not provided with a switch and is connected to the interface circuit unit 212. Although not shown, power is also supplied to the power supply switching logic unit 228 from the main power supply 230.

  The operation of the fifth embodiment will be described below.

  When switching from the operable state to the power saving state, the power supply switching logic unit 228 stops the power supply from the main power supply 230 to the overall control circuit unit 218 and the printer mechanism unit 226 by turning off the switch 260. . On the other hand, power is supplied from the main power supply 230 to the interface circuit unit 212. When the host computer 202 is turned on from off and switched from the power saving state to the operable state, power is supplied to the interface circuit unit 212 necessary for communication with the host computer 202. Can receive the signal on the data signal line 204. Accordingly, the signal of the data signal line 204 is input to the power switching logic unit 228, and the power switching logic unit 226 is switched to an operable state, whereby power is also supplied to the overall control circuit unit 218 and the printer mechanism unit 226. Is started.

  As an application example, the power switching logic unit 228 divides the main power AC100V into a main power source and a sub power source, and the sub power source is supplied only to the interface circuit unit 212 in the power saving state, and further in the operable state, the overall control circuit unit The main power can be supplied to the printer mechanism unit 226 and the printer mechanism unit 226.

  As described above, by supplying power to the interface circuit unit 212 and the power supply switching logic unit 228 in the power saving state, the printer 200 is automatically switched to an operable state according to the situation of the host computer 202. Can do.

  In the above embodiment, the case where the present invention is applied to a printer has been described. However, the present invention is not limited to this, and the present invention can be applied to a peripheral device such as a scanner. In addition, the above power supply switching logic unit is all realized by a circuit, but is not limited to this, and can be realized by software. In this case, the CPU can execute the program stored in the memory by enabling the power from the power supply line and the signal from the data signal line to be supplied to the overall control circuit unit including the CPU. It is possible to implement control of power supply switching.

  Furthermore, in the printer according to the third embodiment, the CPU of the overall control unit is applied as a part of the switching unit. However, the present invention is not limited to this, and a CPU provided in the interface controller can be applied. .

1 is a schematic diagram illustrating a printer according to a first embodiment of the present invention. FIG. 3 is a circuit diagram illustrating a power supply switching logic unit in the printer according to the first embodiment of the present invention. It is the circuit diagram which showed the power supply switching logic part in the printer of the 2nd Embodiment of this invention. It is the schematic which shows the printer of the 3rd Embodiment of this invention. It is the circuit diagram which showed the power supply switching logic part in the printer of the 3rd Embodiment of this invention. It is a flowchart of the routine which CPU in the printer of the 3rd Embodiment of this invention performs. It is the circuit diagram which showed the power supply switching logic part in the printer of the 4th Embodiment of this invention. It is the schematic which shows the printer of the 5th Embodiment of this invention. It is the circuit diagram which showed the power supply switching logic part in the printer of the 5th Embodiment of this invention.

Explanation of symbols

10, 100, 200 Printer 40, 130, 230 Main power source 12, 102, 202 Host computer 22, 112, 212 Interface circuit unit 38, 50, 128, 172, 228 Power switching logic unit 108 Address register 114 CPU

Claims (8)

A peripheral device capable of switching to either one of an operable state for supplying power from a main power source and a power saving state for supplying power from the main power source lower than the operable state,
An input / output interface capable of transmitting / receiving data including address data unique to the peripheral device to / from the host;
An address storage unit for storing the address data transmitted from the host;
Monitoring whether the address data is stored in the address storage unit, and when at least one of the address data is stored in the address storage unit, the peripheral device is set in the operable state, and Switching means for switching the peripheral device from the operable state to the power saving state when the state in which the address data is not stored continues for a predetermined time or longer in the operable state;
Equipped with a,
The address data is notified from the host to the peripheral device when the host power is turned on and stored in the address storage unit, and reset from the host when the host power is turned off. A peripheral device deleted from the address storage unit based on a signal . A peripheral device capable of switching to either one of an operable state for supplying power from a main power source and a power saving state for supplying power from the main power source lower than the operable state,
An input / output interface capable of transmitting / receiving data including address data unique to the peripheral device to / from the host;
An address storage unit for storing the address data transmitted from the host;
Monitors whether the address data is stored in the address storage unit and whether power is supplied from the host to the input / output interface, and power is supplied from the host to the input / output interface. The peripheral device is set to the operable state, and when the state in which the address data is not stored continues for a predetermined time or longer in the operable state, the peripheral device is moved from the operable state to the Switching means for switching to the power saving state;
Equipped with a,
The address data is notified from the host to the peripheral device when the host power is turned on and stored in the address storage unit, and is reset from the host when the host power is turned off. A peripheral device deleted from the address storage unit based on a signal . The peripheral device according to claim 1 , wherein the power saving state is a state in which power of the main power supply is supplied only to the input / output interface, the address storage unit, and the switching unit. The peripheral device according to claim 1 , wherein the address data is IP address data. The peripheral device according to claim 1 , wherein the input / output interface is a USB, IEEE 1394, or LAN interface. The peripheral device according to claim 1 , wherein the host is a host computer or a network device. An input / output interface capable of transmitting / receiving data including address data unique to the peripheral device to / from a host, and an address storage unit for storing the address data transmitted from the host, and power from a main power supply When switching the power supply of a peripheral device that can be switched to any one of an operable state and a power saving state of supplying power by reducing the power from the main power source than the operable state,
When the host power is turned on, the address data notified from the host to the peripheral device is stored in the address storage unit, and when the host power is turned off, the host resets the host. Deleting the address data from the address storage unit based on a signal ;
Monitoring whether the address data is stored in the address storage unit;
When at least one piece of the address data is stored in the address storage unit, the peripheral device is set in the operable state, and in the operable state, the state in which the address data is not stored continues for a predetermined time or more. When the peripheral device is switched from the operable state to the power saving state,
Peripheral power supply switching method. An input / output interface capable of transmitting / receiving data including address data unique to the peripheral device to / from a host, and an address storage unit for storing the address data transmitted from the host, and power from a main power supply When switching the power supply of a peripheral device that can be switched to any one of an operable state and a power saving state of supplying power by reducing the power from the main power source than the operable state,
When the host power is turned on, the address data notified from the host to the peripheral device is stored in the address storage unit, and when the host power is turned off, the host resets the host. Deleting the address data from the address storage unit based on a signal;
Monitoring whether the address data is stored in the address storage unit and whether power is supplied from the host to the input / output interface;
When power is supplied from the host to the input / output interface, the peripheral device is set in the operable state, and the state in which the address data is not stored continues in the operable state for a predetermined time or more. When the peripheral device is switched from the operable state to the power saving state,
Peripheral power supply switching method.

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