JPH06236226A - Automatic power opening/ closing device for computer peripheral equipment - Google Patents

Abstract

PURPOSE:To provide the automatic power opening/closing device of computer peripheral equipment capable of supplying the power of a peripheral equipment without passing through a host computer and automatically turning on/off the power of the peripheral equipment by interlocking with power ON/OFF of the host computer. CONSTITUTION:This automatic power opening/closing device of computer peripheral equipment is provided with a discriminating means 6 for discriminating the operating state and non-operating state of a host computer 1 based on the signal state of a cable 3 to connect the host computer 1 and a computer peripheral equipment 2, a power turn-on means 5 for turning on the power of the computer peripheral equipment 2 when the discriminating means 6 discriminates the operating state of the host computer 1, and a power turn-off means 5 for turning off the power of the computer peripheral equipment 2 when the discriminating means 6 discriminates the non-operating state of the host computer 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic power supply switching device for computer peripherals.

[0002]

2. Description of the Related Art Some computers are provided with an outlet for supplying power to peripheral devices such as a printer, a display, and an external storage device in conjunction with the on / off of the power of the computer, and some are not. .

[0003]

In the case where the host computer is not provided with an outlet for supplying power to the peripheral device in synchronization with the power on / off of the computer, the peripheral device connected to the host computer is not provided. The operator has to turn on / off the power separately from the on / off of the power to the host computer, and the operation is troublesome.

On the other hand, even when the host computer is provided with an outlet for supplying power to the peripheral devices in conjunction with the power on / off of the computer, the outlet provided in the host computer is the power switch of the host computer. Since it is connected to a commercial power source via a power line, the power consumption of peripheral devices that can be connected to this outlet is limited by the capacity of the power line and power switch of the host computer.

The present invention is a computer peripheral device capable of supplying power to peripheral devices without passing through a host computer and automatically turning on / off the power of peripheral devices in conjunction with powering on / off of the host computer. It is an object of the present invention to provide an automatic power supply switchgear.

[0006]

According to a first aspect of the present invention, there is provided an automatic power supply switching device for a computer peripheral device, in which the host computer is activated based on a signal state of a cable connecting the host computer and the computer peripheral device. Discriminating means for discriminating that the host computer is in the operating state, and a discriminating means for discriminating that the host computer is in the operating state, and the discriminating means. When the host computer determines that the host computer is in a non-operational state, the power source of the computer peripheral device is turned off.

A SCSI (small computer system interface) cable, for example, is used as the cable connecting the host computer and the computer peripheral device. Then, as the determination means, S
Included in the signal line of the SCSI cable that determines whether the host computer is in the operating state or in the non-operating state based on the signal state of the signal line for supplying power to the terminating resistor of the CSI cable. For example, a device that determines whether the host computer is in the operating state or in the non-operating state based on the generated noise is used.

According to a second aspect of the present invention, there is provided an automatic power supply switching device for a computer peripheral device in which the host computer is in the operating state and in the non-operating state based on the current of the power supply line for supplying power to the host computer. Determining means for determining that the host computer has been activated by the determining means, and power-on means for turning on the power supply of the computer peripheral device connected to the host computer, and the determining means. When the host computer determines that the host computer is in a non-operational state, the power source of the computer peripheral device is turned off.

[0009]

In the first automatic power supply switching device for computer peripherals according to the present invention, the host computer is in the operating state and the non-operating state based on the signal state of the cable connecting the host computer and the computer peripherals. It is determined that Then, when it is determined that the host computer is in the operating state, the power of the computer peripheral device is turned on. Further, when it is determined that the host computer has become inoperative, the power of the computer peripheral device is turned off.

In the second automatic power supply switching device for computer peripherals according to the present invention, the host computer is activated and deactivated based on the current of the power supply line for supplying power to the host computer. It is determined that it has become. Then, when it is determined that the host computer is in the operating state, the power of the computer peripheral device is turned on. Further, when it is determined that the host computer has become inoperative, the power of the computer peripheral device is turned off.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention. The host computer 1 includes a hard disk device,
External peripheral devices 2 such as a magneto-optical disk device, a CDROM device, and a floppy disk device are connected via a SCSI cable 3. A peripheral device drive output terminal OUT1 of the peripheral device power supply circuit 4 is connected to the peripheral device 2 via an a contact 5a of a relay 5. Peripheral device power supply circuit 4
A commercial power supply is connected to the input terminal IN of.

The peripheral device power supply circuit 4 has a relay drive output terminal OUT2 as well as a peripheral device drive output terminal OUT1. Output terminal for relay drive of peripheral device power supply circuit 4
A series circuit of a relay 5 and a switching transistor 6 is connected between the positive terminal and the negative terminal of OUT2. The base of the switching transistor 6 is SCS.
Among the signal lines of the I cable 3, the signal line 31 that supplies power to the terminating resistor (not shown) of the SCSI cable 3 is the resistor 7
Connected through. The negative terminal of the relay drive output terminal OUT2 of the peripheral device power supply circuit 4 is connected to the ground line 32 of the signal lines of the SCSI cable 3.

When the host computer 1 is in operation, a voltage of about 5V is supplied to the signal line 31 for supplying power to the terminating resistor of the SCSI cable 3, and the a contact 5a is opened / closed depending on the presence or absence of this voltage. It That is,
When the host computer 1 is turned on by turning on the power switch of the host computer 1, the SC
A voltage of 5V is applied to the signal line 31 of the SI cable 3. When a voltage of 5 V is applied to the signal line 31 of the SCSI cable 3, the switching transistor 6 turns on and the relay 5 turns on. When relay 5 turns on,
The a-contact 5a is turned on, and driving power is supplied from the peripheral device power supply circuit 4 to the peripheral device 2.

When the host computer 1 becomes inactive due to the power switch of the host computer 1 being turned off, the voltage of 5V is not supplied to the signal line 31 of the SCSI cable 3. When the voltage of 5V is not supplied to the signal line 31 of the SCSI cable 3, the switching transistor 6 is turned off and the relay 5 is turned off.
When the relay 5 is turned off, its a contact 5a is turned off, the peripheral device 2 is disconnected from the peripheral device power supply circuit 4, and the drive power is not supplied from the peripheral device power supply circuit 4 to the peripheral device 2.

That is, the automatic power supply switching device for the computer peripheral device is based on the signal of the signal line 31 for supplying electric power to the terminating resistor among the signal lines of the SCSI cable 3 connecting the host computer 1 and the peripheral device 2. Then, the opening and closing of the power supply of the peripheral device 2 is controlled.

Commercial power is always supplied to the power supply circuit 4, but when the host computer 1 is in a non-operating state, the peripheral device drive output terminal OUT1 is disconnected from the peripheral device 2, so Power consumption is very low. Instead of the relay 5, an active element such as a transistor or a photo coupler may be used.

FIG. 2 shows a second embodiment of the present invention. 2, the same components as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. In this automatic power supply switching device for computer peripheral equipment, a relay power supply circuit 8 for driving the relay 5 is provided separately from the peripheral equipment power supply circuit 4. The output terminal OUT of the peripheral device power supply circuit 4 is always connected to the peripheral device 2, and the a-contact 5 of the relay 5 is connected.
“A” is provided between the commercial power supply and the input terminal IN of the peripheral device power supply circuit 4. The operation of this automatic power switchgear is
Since it is almost the same as the first embodiment, its explanation is omitted. In the second embodiment, when the host computer 1 is in the non-operational state, the peripheral device power supply circuit 4 does not consume any power, so that the power consumption can be reduced.
Instead of the relay 8, an active element such as a transistor or a photo coupler may be used.

FIG. 3 shows a third embodiment of the present invention. In FIG. 3, the same parts as those in FIG. In this automatic power supply switching device for computer peripherals, a low power consumption relay 11 is connected between a signal line 31 for supplying power to the terminating resistor of the SCSI cable 3 and a ground line 32 of the SCSI cable 3. . Further, a relay 12 which is on / off controlled by an a-contact 11a of the relay 11 and is driven by a commercial power source is provided. The output terminal OUT of the peripheral device power supply circuit 4 is always connected to the peripheral device 2, and the a contact 12a of the relay 12 is a commercial power supply and an input terminal of the peripheral device power supply circuit 4.
It is provided between IN and.

The host computer 1 is in operation,
When a voltage of 5V is applied to the signal line 31 that supplies power to the terminating resistor of the SCSI cable 3, the power turns on the relay 11 and turns on its a-contact 11a. When the a-contact 11a is turned on, the relay 12 is turned on and the a-contact 12a is turned on, so that driving power is supplied from the peripheral device power supply circuit 4 to the peripheral device 2. When the host computer 1 becomes non-operational and the voltage of 5V is not applied to the signal line 31 for supplying power to the terminating resistance of the SCSI cable 3, the relay 8 is turned off,
The relay 9 is turned off, the peripheral device power supply circuit 4 is disconnected from the commercial power supply, and the drive power is not supplied from the peripheral device power supply circuit 4 to the peripheral device 2.

Also in this embodiment, when the host computer 1 is in the non-operating state, the peripheral device driving power supply circuit 4 does not consume any power, so that the power consumption can be reduced. Instead of the relays 11 and 12, active elements such as triacs and phototriacs may be used.

FIG. 4 shows a fourth embodiment of the present invention. 4, the same parts as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. In this automatic power supply switching device for computer peripherals, the switching transistor 6 is
On / off control is performed based on the output Q of the RS flip-flop 16. The output terminal of the OR circuit 13 is connected to the set input terminal S 1 of the SR flip-flop 16.
At the reset input terminal S of the SR flip-flop 16,
The output terminal of the timer circuit 15 is connected. The output terminal of the NOR circuit 14 is connected to the input terminal of the timer circuit 15. A plurality of required control signal lines of the SCSI cable 3 are connected to the input terminal of the OR circuit 13. N
The same control signal line that is connected to the input terminal of the OR circuit 13 is also connected to the input terminal of the OR circuit 14.

When the host computer is in operation,
At least one of the control signal lines connected to the input terminal of the OR circuit 13 becomes H level, and the OR circuit 13
Since the output signal of is at H level, the SR flip-flop 16 is set and its output Q becomes at H level. S
When the output Q of the R flip-flop 16 becomes H level,
The switching transistor 6 is turned on and the relay 5 is turned on. When the relay 5 is turned on, its a contact 5a
Is turned on, and drive power is supplied from the peripheral device power supply circuit 4 to the peripheral device 2.

When the host computer 1 becomes inoperative, all the control signal lines connected to the input terminals of the NOR circuit 14 become L level and the output signal of the NOR circuit 14 becomes H level. The output signal of the NOR circuit 14 is H
When it reaches the level, the timer circuit 15 outputs an H level signal after a fixed time, the SR flip-flop 16 is reset, and its output Q becomes L level. When the output Q of the SR flip-flop 16 becomes L level, the switching transistor 6 is turned off and the relay 5 is turned off. When the relay 5 is turned off, the a-contact 5a is turned off, the peripheral device 2 is disconnected from the peripheral device power supply circuit 4, and the drive power is not supplied from the peripheral device power supply circuit 4 to the peripheral device 2.

FIG. 5 shows a fifth embodiment of the present invention. 5, the same components as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. This automatic power supply switching device for computer peripherals uses the power supply of peripheral devices 2 based on clock noise and power supply noise of several megahertz superimposed on the control signal line 33 of the SCSI cable 3 when the host computer 1 is in operation. It controls the opening and closing of.

When the host computer 1 is activated, noise appears on the control signal line 33 of the SCSI cable 3. This noise, after passing through the high-pass filter 21,
The signal is amplified by the amplifier 22 and detected by the detector 23. The detected DC voltage signal is sent to the base of the switching transistor 6 via the resistor 7 as in the first embodiment. As a result, the switching transistor 6 is turned on and the relay 5 is turned on. When the relay 5 is turned on, its a-contact 5a is turned on, and driving power is supplied from the peripheral device power supply circuit 4 to the peripheral device 2.

When the host computer 1 is deactivated, noise does not appear on the control signal line 33 of the SCSI cable 3, so the switching transistor 6 is turned off and the relay 5 is turned off. When relay 5 turns off,
The a-contact 5a is turned off, the peripheral device 2 is disconnected from the peripheral device power supply circuit 4, and the drive power is not supplied from the peripheral device power supply circuit 4 to the peripheral device 2.

Also in this case, as in the second embodiment, the relay power supply circuit for driving the relay 5 is provided separately from the peripheral equipment power supply circuit 4, and the a-contact of the relay 5 is provided for the peripheral equipment power supply circuit 4. It may be provided between the input terminal IN and the commercial power supply.

FIG. 6 shows a sixth embodiment of the present invention. 6, the same components as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. The automatic power supply switching device for the computer peripheral device controls the opening and closing of the power supply of the peripheral device 2 based on the current flowing in the power supply line 21 connecting the commercial power supply and the host computer 1.

This automatic power supply switching device includes a current detector 42 for monitoring the current of a power supply line 41 connecting a commercial power source and the host computer 1, and a relay 43 driven based on the output of the current detector 42. I have it. The output terminal OUT of the peripheral device power supply circuit 4 is constantly connected to the peripheral device 2, and the a contact 43a of the relay 43 is provided between the input terminal IN of the peripheral device power supply circuit 4 and the commercial power supply. .

The host computer 1 is activated and
Power supply line 4 connecting the commercial power supply and the host computer 1
When the current starts to flow in 1, the current detector 42 relays 43
Is supplied with a drive current, and the relay 43 is turned on. When the relay 43 is turned on, its a-contact 43a is turned on, the peripheral device power supply circuit 4 is connected to a commercial power source, and drive power is supplied from the peripheral device power supply circuit 4 to the peripheral device 2.

When the host computer 1 becomes inoperative and the current supply to the power supply line 41 is stopped, the relay 43
Is turned off and the a contact 43a is turned off.
The peripheral device power supply circuit 4 is disconnected from the commercial power supply, and the power supply to the peripheral device 4 is stopped. Instead of the relay 43, an active element such as a triac or a phototriac may be used.

According to the first to sixth embodiments, the power supply of the peripheral equipment 2 such as the external storage device can be supplied without passing through the host computer 1, and the power supply of the host computer 1 is turned on and off. The power of the peripheral device 2 can be automatically turned on / off. Therefore, the peripheral device 2 is interlocked with the power supply of the host computer 1
Even if the host computer 1 does not have an outlet for supplying power to the host computer 1, the peripheral device 2 connected to the host computer 1 is powered on by the host computer 1.
It can be turned on and off in tandem with the power on and off.

Although the host computer 1 is equipped with an outlet for supplying power to the peripheral device 2 in tandem with turning on and off of the power of the host computer 1, the peripheral device 2
Even when the power consumption of the above exceeds the outlet capacity of the host computer 1, the power supply of such a peripheral device 2 can be turned on / off in conjunction with the turning on / off of the power supply of the host computer.

By the way, some computer peripheral devices, such as an external storage device, do not operate normally when the operating state is delayed compared to the host computer due to the delay in the rise of the power supply circuit for converting the commercial power supply into the operating power supply. . In this type of computer peripheral device, the outlet provided in the host computer cannot be used.
As shown in FIG. 1, FIG. 4 and FIG. 5, when a contact for opening and closing the power source is provided between the peripheral device 2 and the peripheral device power supply circuit 4, the operating state is delayed compared to the host computer 1. Even a peripheral device that does not operate normally can be turned on in synchronization with the power-on of the host computer 1 without delaying the operating state of the host computer 1.

[0036]

According to the present invention, the power supply of peripheral equipment such as an external storage device can be supplied without passing through the host computer, and the power supply of the peripheral equipment is automatically turned on / off in conjunction with the power supply of the host computer. can do.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram showing an automatic power supply switching device for a computer peripheral device according to a first embodiment of the present invention.

FIG. 2 is an electric circuit diagram showing an automatic power supply opening / closing device for computer peripherals according to a second embodiment of the present invention.

FIG. 3 is an electric circuit diagram showing an automatic power supply opening / closing device for a computer peripheral device according to a third embodiment of the present invention.

FIG. 4 is an electric circuit diagram showing an automatic power supply switching device for computer peripherals according to a fourth embodiment of the present invention.

FIG. 5 is an electric circuit diagram showing an automatic power supply switching device for a computer peripheral device according to a fifth embodiment of the present invention.

FIG. 6 is an electric circuit diagram showing an automatic power supply switching device for computer peripherals according to a sixth embodiment of the present invention.

[Explanation of symbols]

 1 Host Computer 2 Peripheral Device 3 SCSI Cable 4 Peripheral Device Power Supply 5, 8, 11, 12, 43 Relay 6 Switching Transistor 9 Relay Power Supply 13 OR Circuit 14 NOR Circuit 16 RS Flip-Flop 21 High Pass Filter 22 Amplifier 23 Detector 41 Power line 42 Current detector

Claims (4)

[Claims] 1. A discriminating means for discriminating whether a host computer is in an operating state or a non-operating state based on a signal state of a cable connecting a host computer and a computer peripheral device, said discriminating means. When it is determined that the host computer is in the operating state, power-on means for turning on the power of the computer peripheral device, and when the determining means determines that the host computer is in the inactive state, the computer peripheral An automatic power supply switching device for computer peripherals, which is equipped with a power supply disconnecting means for disconnecting the power supply of the device. 2. The cable connecting the host computer and the computer peripheral device is a SCSI cable, and the determining means is based on a signal state of a signal line for supplying power to a terminating resistor of the SCSI cable. The method for determining that the host computer is in the operating state and is in the non-operating state.
A power supply automatic switching device for the computer peripherals described. 3. The cable connecting the host computer and the computer peripheral device is a SCSI cable, and the discriminating means activates the host computer based on noise included in a signal line of the SCSI cable. 2. The automatic power supply switchgear for computer peripherals according to claim 1, wherein the automatic power supply switchgear for computer peripherals is for determining whether the power supply is turned off or in a non-operation state. 4. A discriminating means for discriminating whether the host computer is in an operating state or in a non-operating state based on a current of a power supply line for supplying electric power to the host computer; When it is determined that the host computer is in the operating state, it is determined that the host computer is in the non-operating state by the power-on means that turns on the power supply of the computer peripheral device connected to the host computer. An automatic power supply opening / closing device for computer peripherals, comprising a power supply disconnecting means for disconnecting the power supply for the computer peripherals when the power is turned off.