JPH03219318A - Electronic apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to electronic equipment. For details, please refer to the main device and
Related to an electronic device that includes a main device and a peripheral device that is driven by a DC power supply supplied from the main device [Prior art] An electronic device that includes a main device and a peripheral device that is driven by a DC power supply that is supplied from the main device For example, the device shown in FIG. 3 is known.

In the figure, 1 is a main device such as a data processing device, 2 is
is a peripheral device such as a printer that prints data from the main device 1. The main device 1 is provided with a power supply circuit 4 that converts alternating current power AC supplied via a power switch 3 into direct current power DC and outputs the DC power. The direct current power DC output from the power supply circuit 4 is supplied to each circuit within the main device 1 and also to the peripheral device 2.

Therefore, when the power switch 3 is turned on and off, the power of the main device 1 is turned on and off, and at the same time, the power of the peripheral device 2 is also turned on and off.

[Problem to be Solved by the Invention] However, in the conventional configuration, for example, if an abnormality occurs in the peripheral device 2 and the power to the peripheral device 2 is not turned off, the power switch 3 of the main device 1 must be turned off.

Then, the power to main device 1 is also turned off, so it is necessary to stop main device 1 while the peripheral device 2 is being restored.In other words, even though there is no abnormality in main device 1, it cannot be used for other tasks. Can not do it.

Moreover, even if the power switch 3 of the main device 1 is turned on immediately after the recovery processing of the peripheral device 2, there is a problem that it takes time for the main device 1 to start up normally after the power switch 3 is turned on.

It is therefore an object of the present invention to solve these conventional problems, to enable peripheral devices to be activated almost simultaneously when the power to the main device is turned on, and to enable the main device to be powered on even when an abnormality occurs in the peripheral device. To provide an electronic device that can turn on and off only the power of peripheral devices without stopping the device.

[Means for Solving the Problems] Therefore, the present invention includes a main device and a peripheral device driven by DC power supplied from the main device, and a power supply circuit that outputs DC power to the main device. , a switching means inserted into a path for supplying DC power from the power supply circuit to the peripheral device; an input means; the switching means is turned on when the power of the main device is turned on; and input from the input means is provided. The invention is characterized in that it is provided with control means for turning on and off depending on the conditions.

[Function] When the power of the main device is turned on, the switching means is turned on by the control means, so that DC power from the power supply circuit is supplied to the peripheral devices. Therefore, peripheral devices can be made ready to drive almost at the same time as the main device is powered on.
Processing can be started immediately after the main device is powered on.

Here, for example, if an abnormality occurs in a peripheral device and the power of the peripheral device is not to be turned off, a command to that effect is inputted from the input means. Then, the switching means is turned off by the control means. Therefore, the supply of DC power to the peripheral devices is stopped, so the recovery process is performed in this state.During this time, there is no need to turn off the power to the main device, so the main device can be used for other tasks. , the start-up time after recovery can also be shortened.

After the peripheral device recovery processing, a command to turn on the power of the peripheral device is inputted from the input means. Then, the switching means is turned on by the control means.

As a result, DC power is supplied to the peripheral device again, so that the peripheral device can be driven.

[Example 1] An example of the present invention will be described below with reference to FIGS. 1 and 2. In addition, when explaining these figures, the same reference numerals are given to the same constituent elements as in Fig. 3 mentioned above,
The explanation will be omitted.

In this embodiment, as shown in FIG. 1, in addition to the power supply circuit 4, the main device 1 includes a
P transistor 11, keyboard 1 constituting input means
2 and a CPU 13 constituting a control means.

The transistor 11 has its emitter E connected to the output side of the power supply circuit 4, its collector C connected to the peripheral device 2, and its base B connected to the output port PO of the CPU 13. That is, the transistor 11 is inserted in a path for supplying DC power from the power supply circuit 4 to the peripheral device 2 .

The CPU 13 executes the process of the flowchart shown in FIG. 2 when the power switch 3 is turned on.

That is, the transistor 11 is turned on when the main device 1 is powered on, the transistor 11 is turned off when a key from the keyboard 12 is a power-off command, and the transistor 11 is turned on when a power-on command is issued. If there is any other key human power, the process will be executed according to that key human power. For details on the flowchart in Figure 2,
This will be explained with the following action.

Next, the operation of this embodiment will be explained.

When the power switch 3 of the main device 1 is turned on, the CPU 1
1 executes the process of the flowchart shown in FIG.

First, in step (hereinafter abbreviated as ST) 1, the output port Po is set to "off". Then, the - transistor 11 is turned on, so the output from the power supply circuit 4 is supplied to each circuit in the main device 1 and the peripheral device 2. Thereby, the peripheral device 2 is also in a state where it can be driven together with the main device 1.

In this state, if there is a predetermined key input from the keyboard 12 of the main device 1 (key input other than a power-on command and a power-off command), the CPU 13 executes a predetermined process according to the key input.

Here, when it is recognized in ST3 that the power off current command has been input, the process proceeds to ST5 and the output port Po is set to H". Then, the transistor 11 is turned off, so power is supplied from the power supply port FaI4 to the peripheral device 2. As soon as the power is turned off, the power is turned off. Therefore, if an abnormality occurs in the peripheral device 2 and the power of the peripheral device 2 is not turned off, inputting the power off command from the keyboard 12 will turn off the power of the peripheral device 2. In this state, the recovery process for the peripheral device 2 is performed, and since the main device 1 is in the power-on state, other tasks can be executed.

Further, when it is recognized in ST4 that the power off current signal has been input, the process proceeds to ST6 and the output port Po is set to "L". Then, the transistor 11 is turned on, so the power supply circuit 4
DC power is supplied from the terminal to the peripheral device 2. Therefore, if the power of the peripheral device 2 is not turned on after the recovery process of the peripheral device 2, the power of the peripheral device 2 can be turned on again by inputting a power-on command from the keyboard 12.

Therefore, according to this embodiment, a transistor 11 is inserted in the path for supplying DC power from the power supply port path 4 of the main device 1 to the peripheral device 2, and this transistor 11 is activated in response to input data from the keyboard 12. Since the power is turned on and off automatically, even if an abnormality occurs in the peripheral device and the power to peripheral device 2 is not turned off, only the power to peripheral device 2 can be turned off. can be turned on. Therefore, during this time, the main device 1 can be used for other tasks. Of course, since there is no need to turn off the t source of the main device 1, the startup time after the recovery process can also be shortened.

In addition, since the transistor 11 is turned on when the main device 1 is powered on, the power switch 3 of the main device 1 is turned on.
By simply turning on the peripheral device 2, the power of the peripheral device 2 can be automatically turned on. Therefore, there is no need for any special operation apart from the power switch 3, and the peripheral device 2 is automatically powered on at almost the same time as the main device 1.
Processing can be started immediately after the power is turned on.

In the above embodiment, the keyboard 12 is used as an input means.
However, the present invention is not limited to this. For example, depending on the position of the dip switch, the CPU 13 may
The helang resistor 11 may be turned on and off.

[Effects of the Invention] As described above, according to the present invention, the switching means is inserted into the path for supplying DC power from the power supply circuit of the main device to the peripheral equipment, and the switching means is activated in accordance with the input from the input means. Since it is configured to turn on and off, even if an abnormality occurs in a peripheral device and you want to turn off the power to the peripheral device, you can turn off only the power to the peripheral device, and you can also turn on the power to the peripheral device after the recovery process. I can do it. Therefore, it is not necessary to turn off the power to the main device during this time, so that the main device can be used for other tasks and the start-up time after recovery can be shortened. In addition, since the switching means is turned on when the power of the main device is turned on, it is possible to automatically turn on the power of peripheral devices at almost the same time as the main device, without having to perform a special operation to turn on the switching means. Therefore, the main device's ta
You can start processing immediately after turning it on.

[Brief explanation of drawings]

1 and 2 show an embodiment of the present invention,
FIG. 1 is a block diagram, and FIG. 2 is a flowchart. FIG. 3 is a block diagram showing a conventional example. DESCRIPTION OF SYMBOLS 1...Main device, 2...Peripheral device, 4...Power supply circuit, 11...Transistor (switching means), 12...
...Keyboard (input means), 13...CPU (control means).

Claims (1)

[Claims] (1) A main device and a peripheral device that is driven by DC power supplied from the main device, and a power circuit that outputs DC power to the main device, and a power circuit that outputs DC power from the power circuit to the peripheral device. a switching means inserted into a path for supplying the power, an input means, and a control means that turns on the switching means when the power of the main device is turned on, and turns on and off according to input from the input means, respectively. An electronic device characterized by: