JPH08314581A - Power source controller - Google Patents

Abstract

PURPOSE: To provide a power source controller where a power source is not errorneously turned-off by operating a power source switch in a state where display is not executed in a display device by means of a power save mode, etc. CONSTITUTION: The power source controller is provided with a power source control circuit 2 controlling the on/off of a system power source by input information of the power source switch 4 and CPU 1 which turns on/off of the power source of the display device 5 for restricting the power consumption of the device 5 and also releases ontly the power save mode without turning off the system power source when the power source switch 4 is operated at the time of the power save mode. Then, when the power source of the display device 5 is turned off in a power save state, etc., so that nothing is displayed in the display device 5, the system power source is prevented from being turned- off by the errorneous operation of the power source switch 4 and the power source is restored to be the state before turning-off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a small electronic device for controlling on / off of a system power supply by operating a power switch, and a display device when an operation input of the power switch is made during system operation. The present invention relates to a power supply control device that controls the system power supply according to the display state of.

[0002]

2. Description of the Related Art Conventionally, in order to suppress system power consumption and protect a display device, when there is no external input such as a key input for a certain period of time, the display device is turned off or a signal to the display device is sent. Electronic devices that reduce power consumption by controlling the display device in a power save mode by stopping the supply have become widespread.

In the conventional device of this kind, the system power is turned off by operating the power switch regardless of whether the display device is controlled in the power save mode or not under the system operating condition. It was

[0004]

As described above, in the conventional system configuration, when no display is made on the display device in the power save mode or the like in order to suppress power consumption and protect the display device. , It is indistinguishable from the system power off, trying to power on the system,
There was an inconvenient problem of operating the power switch and accidentally turning off the power of the system.

The present invention has been made in consideration of the above circumstances, solves the above problems, and is in a state where no display is made on the display device in the power save mode,
An object of the present invention is to provide a power supply control device that prevents the power supply from being accidentally turned off even if the power supply switch is operated.

[0006]

In order to achieve the above-mentioned object, the present invention aims to suppress the power consumption of an on / off control means for controlling on / off of a system power supply according to input information of a power supply switch and power consumption of a display device. Turn on the display device /
Power saving means for turning off and power saving, and means for canceling only the power saving mode without turning off the system power when the power switch is operated in the power saving mode are provided. Power control device.

In order to achieve the above object, the present invention comprises an on / off control means for controlling on / off of a system power supply according to input information of a power switch, a power save function and a resume function of a display device. When the power switch is operated in the power save mode, the resume function is automatically activated to save the current state regardless of whether the resume function is used, and then the system power is turned off, and then the system power is turned on. The power control device is characterized in that when the power is turned on, the power returns to the state before the power was turned off.

In order to achieve the above object, the present invention further provides an on / off control means for controlling on / off of a system power supply according to input information of a power switch, a power save function of a display device, and an external input such as a keyboard. And a device,
If the power switch is pressed in power save mode,
It is characterized by canceling the power save mode, waiting for input from the external input device for a certain period of time, turning off the system power when there is no input, and not turning off the system power when there is input. It is in the power supply control device.

[0009]

With the above structure, even if the display device is turned off due to a power save state or the like, and nothing is displayed on the display device, the system will not operate even if the power switch is operated by mistake. It is possible to prevent the power from being turned off, or to save the system state before the power is turned off and restore the system state when the power is turned on when the power switch is operated in the power save state.

[0010]

The outline of the present invention is as follows. 1. A circuit for taking in the power switch state, a power supply device capable of controlling ON / OFF of the power supply of the system by software, a control device for controlling the power supply to the display device, and a circuit for recognizing the power supply state of the display device are provided. This prevents the power of the display device from being turned off without turning off the power of the system when the power switch is pressed while the power of the display device is turned off, so that the power of the system is not turned off accidentally. Can be

2. When the resume function is added to the configuration of 1 above and the power switch is pressed while the display device is powered off, the resume function stores the state when the power switch is pressed, and then the system power is turned on. If you accidentally turn off the system power by turning off the power, you can return to the original state by turning the power on again.

3. When an input device (keyboard, etc.) is added to the configuration of the above 1 and the power switch is pressed while the display device is powered off, the display device is turned on and then the system power is turned off. Give time,
By monitoring the input from the input device during this period and turning off the system power if there is no input and not turning off the system power if there is an input, the system power will turn off if the power switch is accidentally pressed. You can cancel the power-off state of the display device before.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention (an embodiment in the above outline 1).

In FIG. 1, reference numeral 1 is a CPU, which controls the entire system. A power supply control circuit 2 notifies the CPU 1 of the operation input state of the power supply switch 4 and controls ON / OFF of the system power supply.

A display control circuit 3 controls the output of control signals (display data etc.) to the display device 5 and the power supply of the display device 5. A power switch 4 sends ON / OFF control information of the system power to the power control circuit 2.

Reference numeral 5 denotes a display device, which is controlled in display output by a control signal 106 sent from the display control circuit 3. Reference numeral 101 is a switch signal, which is a signal for transmitting the pressed state of the power switch 4 to the power control circuit 2.

Reference numeral 102 denotes a power-off request signal, which is CP
This is a signal requesting U1 to turn off the system power supply. A power save control signal 103 is a signal for controlling ON / OFF of the power supply of the display device 5.

Reference numeral 104 is a display device status signal,
It is a signal that informs the CPU 1 of the state of the power supply of the display device 5. Reference numeral 105 denotes a power-off signal, which is a signal from the CPU 1 for instructing the power control circuit 2 to turn off the system power.

Reference numeral 106 denotes a display control signal, which is a signal necessary for displaying display data, control signals, etc. on the display device 5. The operation of the configuration shown in FIG. 1 will be described.

First, when the power switch 4 is turned on, the information is transmitted to the power control circuit 2 as a switch signal 101. If the power supply control circuit 2 determines from the switch signal 101 that the system power supply is to be turned off, the CP
A power OFF request signal 102 is sent to U1.

When the CPU 1 receives the power-off request, it checks the display device status signal 104 to check the display device 5
If the power is turned on (power save release state), the power OFF signal 105 is sent to the power control circuit 2 to turn off the system.

If the display device is powered off (power save state) when it receives the power-off request signal 102, the CPU 1 instructs the display control circuit 3 to turn off.
The power save control signal 103 is transmitted, the display device is turned on (release of the power save state), and the system power is not turned off.

As described above, when the power of the display device is turned off in the power saving state of the display device and nothing is displayed on the display device, when the power switch is operated by mistake, The inconvenience that the power is turned off uniquely can be avoided.

FIG. 2 is a block diagram showing the configuration of another first embodiment (embodiment of the above outline 2) of the present invention. 2, the same parts as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. Here, reference numerals 1 to 5 and reference numeral 10
1 to 106 are the same parts as in FIG. 1, and the description thereof will be omitted.

In FIG. 2, reference numeral 6 denotes a storage device, which is a device for saving the state of the CPU 1 or the like when resumed (when the resume mode is set). 201 is stored data,
It is data when the CPU 1 reads and writes the storage device 6.

The operation of the configuration shown in FIG. 2 will be described. Power-off request signal 1 to CPU1
When 02 is input, and when the display device 5 is powered on (power save release state), the operation is the same as that described in FIG.

When the power-off request signal 102 is input and the display device 5 is in the power-off state (power save state), the CPU 1 saves the current processing information and the like in the storage device 6, Power supply OF to the control circuit 2
The F signal 105 is output and the system is powered off. Then, when the system power is turned on next time, the CPU 1 takes in the saved contents from the storage device 6 and restores the state before the power was turned off.

As a result, when the power switch 4 is operated in the power save mode, the resume function is automatically activated to save the current state regardless of whether the resume function is used or not, and then the system power is turned off. The next time the system is turned on, it can be returned to the state before the power was turned off.

FIG. 3 is a block diagram showing the configuration of another second embodiment of the present invention (embodiment in the above outline 3). In FIG. 3, the same parts as those in FIGS. 1 and 2 are designated by the same reference numerals, and the description thereof will be omitted. Here, reference numerals 1 to 5 and reference numerals 101 to 106 are the same portions as those in FIGS. 1 and 2, respectively, and the description thereof will be omitted.

In FIG. 3, reference numeral 7 is a keyboard control circuit which controls the keyboard 8 and outputs key input information to the CPU 1.
To convey to. A keyboard 8 is an external input device for key input.

Reference numeral 301 denotes keyboard input data, which is a signal for exchanging key data between the keyboard control circuit 7 and the keyboard 8. Reference numeral 302 is input key data, which is key data corresponding to a pressed key on the keyboard 8.

The operation of the configuration shown in FIG. 3 will be described. Power-off request signal 1 to CPU1
When 02 is input and the display device 5 is powered on (power save release state), the operation is the same as that of FIG.

When the power-off request signal 102 is input and the display device 5 is in the power-off state (power save state), the CPU 1 waits for an input from the keyboard 8 for a certain period of time and inputs nothing. If there is not, the power OFF signal 105 is sent to the power control circuit 2 to turn off the system.

While waiting for input from the keyboard 8,
If there is an input from the keyboard 8, the CPU 1 sends the power save control signal 103 to the display control circuit 3, turns on the power of the display device 5 (cancels the power save state), and does not turn off the power of the system. Accordingly, when the power switch 4 is pressed by mistake, the power-off state (power save state) of the display device 5 can be canceled before the system power is turned off.

[0035]

As described above in detail, according to the present invention, when the display device is powered off due to a power saving state or the like and nothing is displayed on the display device, the power switch is erroneously turned on. Even if is operated, it is possible to prevent the power of the system from being turned off and to return to the state before the power was turned off.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a block diagram showing the configuration of another first embodiment of the present invention.

FIG. 3 is a block diagram showing the configuration of another second embodiment of the present invention.

[Explanation of symbols]

1 ... CPU, 2 ... Power supply control circuit, 3 ... Display control circuit, 4
... power switch, 5 ... display device, 6 ... storage device, 7 ... keyboard control circuit, 8 ... keyboard.

Claims (3)

[Claims] 1. An on / off control means for controlling on / off of a system power supply by operating a power switch, and a power save for turning on / off the power supply of the display device to suppress power consumption of the display device. A power save mode setting means for performing the power save mode; and a means for canceling the power save mode without shutting off the system power when the power switch is operated in the power save mode. Control device. 2. An on / off control means for controlling on / off of a system power supply by operating a power switch, a power save mode setting means of a display device, a resume function setting means, and the power save mode under the power save mode. When the power switch is operated, the resume function is activated regardless of the status of the resume function, the current state is saved, the system power is turned off, and then the system power is turned on, immediately before the system is turned off. And a control means for returning to the above state. 3. An on / off control means for controlling on / off of a system power supply by operating a power switch, a power save mode setting means for a display device, a means for recognizing an operation state of an external input device, and a power supply. When the power switch is operated in the save mode, the power save mode is released, waits for input from the external input device for a certain period of time, and if there is an input during that time, the system power is not turned off A power supply control device comprising: a control means for turning off the power supply.