JP3785611B2 - Electronic device power consumption reduction device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a power consumption reduction device for an electronic device having a function of reducing power consumption in an electronic device such as an MD player, an MD recorder, a CD player, and a mobile phone.
[0002]
[Prior art]
In an electronic device such as an MD player or a CD player, particularly a portable device, the operation mode currently being executed is prevented from being changed to another mode due to an operation command key being carelessly pressed. Therefore, an operation hold function is provided, and a specific example thereof is shown in FIG.
[0003]
The portable MD player shown in FIG. 3 is provided with a microcomputer 1 for controlling the entire operation in a complex manner. The microcomputer 1 is supplied with an output signal of a reference oscillation unit that supplies a reference operation clock signal for executing predetermined operation control, that is, a signal obtained by dividing the output of the oscillation unit 3 by the frequency divider 2. The
[0004]
The frequency divider 2 is configured to be able to change when the frequency division ratio of the frequency divider 2 is controlled by the frequency division control signal a output from the microcomputer 1.
[0005]
Further, the microcomputer 1 is connected with a key input unit 4 composed of a large number of operation keys for giving operation commands such as reproduction start, forward high-speed reproduction, reverse high-speed reproduction, pause, and recording start. The microcomputer 1 is connected to an LCD display 5 for displaying the state of these operations, and the operation instructed by the key input unit 4 can be performed by the MD unit 6 through the microcomputer 1.
[0006]
The MD unit 6 connected to the microcomputer 1 has a function of performing a recording operation and a reproducing operation with respect to a disc (MD), and also has a function of outputting the detected TOC information to the microcomputer 1. is doing.
[0007]
A slide switch type hold switch 7 is provided to hold the current operating state, and one contact terminal thereof is grounded, the common contact terminal is connected to the microcomputer 1, and one end is connected to the reference voltage + V. The other end of the pull-up resistor 8 is connected.
[0008]
Accordingly, when the operation is started after the predetermined power is turned on and the initial setting process is completed, it is first determined whether or not the hold switch 7 is turned on in step S1, as shown in the flowchart of FIG. Specifically, when the output level to the microcomputer 1 is H level (a voltage substantially equal to the reference voltage + V), it is determined to be off, and when it is L level (ground potential), it is determined to be on.
[0009]
When step S1 is No, it progresses to the following step S2, the display of the LCD display 5 is turned on by the command from the microcomputer 1, and simultaneously with this, it progresses to step S3 and proceeds to the key input unit 4 The microcomputer 1 is set to a mode for accepting key operations from step S4, and the process proceeds to step S4 where the frequency division ratio of the frequency divider 2 is controlled by the frequency division control signal a to obtain a normal value having the frequency f1.
[0010]
On the other hand, if Yes in step S1, the process proceeds to step S5 and the display on the LCD display 5 is turned off. Simultaneously, the process proceeds to step S6 and the microcomputer 1 rejects the key operation from the key input unit 4. In the next step S7, the frequency division ratio of the frequency divider 2 is controlled by the frequency division control signal a, and is reduced from the previous frequency to a reduced value of frequency f2.
[0011]
Then, after either step S7 or step S4 is completed, the process returns to the first step S1, it is determined whether or not the hold switch 7 is turned on, and the subsequent operations are repeated.
[0012]
Therefore, when the hold switch 7 is turned on, along with the time Hirao display LCD display 5 which various operating conditions are represented is erased, the frequency minimum value of the clock signal to the microcomputer 1 reduced Therefore, power consumption can be reduced, and in particular, in the case of a battery-driven device, the battery life can be extended. On the other hand, as disclosed in Japanese Patent Application Laid-Open No. 4-247728, when the electronic device is a mobile phone, the expected operation cannot be satisfactorily performed when the reception level is lowered. There are technologies that reduce power consumption.
[0013]
[Problems to be solved by the invention]
In the conventional power consumption reduction device for electronic equipment, the means for reducing power consumption when the operation hold key is operated is to hide the display on the display unit. It is impossible to know what state it is, and in order to know this, the user must confirm by releasing the operation hold key, the power consumption is the original state, That is, there is a problem that power consumption is not reduced as a result of returning to the normal state where power consumption is not reduced.
[0014]
In the case where the electronic device is a mobile phone, the display is not displayed as the reception level is lowered. However, the contents cannot be confirmed and there is a problem in usability.
[0015]
Therefore, the present invention can be applied to either the case where the user directly enters the operation hold state by operating the operation hold key, or the case where the user indirectly enters the operation hold state using detection means such as reception level detection. However, it is possible to provide a power consumption reduction device for an electronic device that can reduce power consumption and can notify the user of the outline of the current operation state in the reduced power consumption state without releasing the operation hold. There is.
[0016]
[Means for Solving the Problems]
In order to solve the above-described problems, a power consumption reduction apparatus for electronic equipment according to the present invention employs a characteristic configuration as described below.
[0017]
(1) A main operation unit for recording / reproducing on a recording medium including an MD and a CD, a reference oscillation unit for generating a reference operation clock signal by dividing a reference operation clock signal of the oscillation unit by a frequency divider, A key input unit for inputting an operation command, a display unit for performing various displays, a hold switch for holding an operation state, the main operation unit, the reference oscillation unit, the key input unit, the display unit, and the hold switch A power consumption reduction of the electronic device that reduces power consumption by reducing the frequency of the operation clock signal by the control unit when the hold switch of the electronic device having a control unit that is connected and performs complex control is in an ON state. In the device
The control unit controls an operation clock signal of the reference oscillation unit, and when the hold switch is not turned on, the display unit displays the elapsed time of recording / playback in seconds and the hold switch is turned on. When it is in a state, it is determined whether or not the display has been switched. When the display is switched, the second unit is displayed. When the display is not switched, the electronic device is controlled to display in minutes. apparatus.
[0019]
( 2 ) The display unit of (1) is configured to scroll-display a plurality of display information, and performs the scroll display when the hold switch is not in an on state, and performs the scroll display when the hold switch is in an on state. A device for reducing power consumption of electronic devices whose display is prohibited .
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG. 1 and FIG. This form is a case where the present invention is applied to an electronic apparatus configured to have an MD recording / reproducing function and a CD reproducing function. As shown in FIG. 1, the microcomputer 9 for controlling the entire apparatus in a complex manner is composed of “CPU, RAM, and ROM”.
[0025]
The microcomputer 9 is connected to the “frequency divider 2, oscillation unit 3, key input unit 4, LCD display 5, hold switch 7, pull-up resistor 8” as described in the section of the prior art. The display 5 includes a backlight light emitting unit.
[0026]
The main operation unit 10 connected to the microcomputer 9 has an MD unit, a CD unit, and a clock unit. The MD unit can perform operations related to predetermined reproduction and recording. The clock unit generates the current time independently, that is, irrespective of the signal formed by the oscillation unit 3 and the frequency divider 2.
[0027]
Therefore, a control unit for controlling the main operation unit 10 that performs a desired operation in combination is configured by the microcomputer 9, and a reference oscillation unit that supplies a reference operation clock signal to the microcomputer 9 is the oscillation unit 3. And a frequency divider 2, and are controlled by the microcomputer 9 and the key input unit 4 formed by a plurality of operation keys for controlling the operation of the main operation unit 10 directly or via the microcomputer 9. The display unit for displaying all or part of the operating state of the main operating unit 10 is composed of the LCD display 5, and a command for prohibiting operation input of all or part of the plurality of operation keys of the key input unit 4 is issued. An operation hold switch 7 to be applied, and a detection unit for detecting a first state in which the hold switch 7 is not operated and a second state in which the operation is performed are configured by the microcomputer 9, and the detection unit performs the second state. To be When output, the output frequency is lowered by changing the frequency dividing ratio for the frequency divider 2 by the frequency division control signal b from the microcomputer 9, and a part of the content displayed on the LCD display 5 is not displayed. A power consumption reduction device is configured by including power consumption control means for controlling the display state.
[0028]
Therefore, when the operation is started after the predetermined power is turned on and the initial setting process is completed, it is first determined whether or not the hold switch 7 is turned on in step S8 as shown in the flowchart of FIG. Specifically, when the output level to the microcomputer 9 is H level (voltage substantially equal to the reference voltage + V), it is determined to be off, and when it is L level (ground potential), it is determined to be on.
[0029]
When this step S8 is No, it progresses to the following step S9, the display of the LCD display 5 is turned on by the instruction | command from the microcomputer 9, and the scroll display by the LCD display 5 is simultaneously performed with this. It is possible (on) to display the elapsed playback time, etc. in seconds, and proceeds to the next step S10, where the frequency division ratio of the frequency divider 2 is controlled by the frequency division control signal b, and the normal value having the frequency f1 To be.
[0030]
On the other hand, in the case of Yes in step S8, the process proceeds to step S11, the scroll display by the LCD display 5 is prohibited (off), the reproduction elapsed time and the like are displayed in minutes, and the process proceeds to the next step S12. It is determined whether or not display switching has been performed. If No, the process proceeds to step S13, where the frequency division ratio of the frequency divider 2 is controlled by the frequency division control signal b to a reduced value of the frequency f2.
[0031]
In the case of Yes in step S12, the process proceeds to step S14, and the frequency division ratio of the frequency divider 2 is controlled by the frequency division control signal b to obtain a normal value having the frequency f1.
[0032]
After either step S10 or step S13 or step S14 is completed, the process returns to the first step S8, it is determined whether or not the hold switch 7 is turned on, and the subsequent operations are repeated.
[0033]
Therefore, when the hold switch 7 is turned on, the display of the LCD display 5 showing various operation states during normal operation is displayed to the minimum necessary, that is, scrolling is not performed, and time display such as elapsed time is displayed. This is done in minutes and the clock frequency is reduced.
[0034]
This kind of minute display is accompanied by the fact that the clock frequency of the microcomputer 9 can be reduced by not performing the display that must be accessed in seconds, for example, the time display of CD or MD, the scroll display, etc. Since the power consumption is reduced in proportion to the clock frequency f and in inverse proportion to the square of the voltage V, the battery life can be extended particularly in the case of a battery-driven device.
[0035]
Since the LCD display 5 shown in FIG. 1 includes a backlight light emitting unit, the light emission of the light emitting unit is controlled to a predetermined amount when the hold switch 7 is turned off, and the light is emitted when the hold switch 7 is turned on. It is possible to further reduce the power by including a means for controlling so as to stop or reduce the amount as compared with the predetermined amount.
[0036]
Further, not only in the case of an electronic device having a MD / CD recording / reproducing function such as the main operation unit 10, but also in an electronic device that performs a predetermined wireless reception operation, for example, a mobile phone, Detecting the state of operation (for example, reception level) to determine whether it is an active state or an inactive state, and when it is determined to be an inactive state, while reducing the oscillation frequency of the reference oscillation unit, It may be a case of power consumption control means for controlling a part of the displayed content to a non-display state.
[0037]
【The invention's effect】
As is apparent from the above description, the power consumption reduction apparatus for electronic equipment according to the present invention is a detection means for detecting the reception level and the like when the user directly enters the operation hold state by operating the operation hold switch. It is possible to reduce power consumption in any of the cases where the operation hold state is indirectly set using the, and the user can obtain an overview of the current operation state in the reduced power consumption state without releasing the operation hold. It is possible to provide a power consumption reduction device for an electronic device that can notify the user.
[Brief description of the drawings]
FIG. 1 is a block circuit diagram illustrating a schematic circuit configuration of an electronic device power consumption reduction device according to an embodiment of the present invention.
2 is a flowchart for explaining an operation of reducing power consumption in the electronic apparatus shown in FIG.
FIG. 3 is a block circuit diagram showing a schematic circuit configuration of a conventional electronic device power consumption reduction device.
4 is a flowchart for explaining an operation of reducing power consumption in the electronic apparatus shown in FIG.
[Explanation of symbols]
2 Divider 3 Oscillator 4 Key input 5 LCD display 7 Hold switch 8 Pull-up resistor 9 Microcomputer 10 Main operating part

Claims (2)

Main operation unit for recording / reproducing on a recording medium including MD and CD, a reference oscillation unit for generating a reference operation clock signal by dividing a reference operation clock signal of the oscillation unit by a frequency divider, and various operation commands Connected to the key input unit for input, the display unit for performing various displays, the hold switch for holding the operation state, the main operation unit, the reference oscillation unit, the key input unit, the display unit, and the hold switch. In the electronic device power consumption reduction device that reduces the power consumption by reducing the frequency of the operation clock signal by the control unit when the hold switch of the electronic device comprising a control unit that performs complex control is in an on state,
The control unit controls an operation clock signal of the reference oscillation unit, and when the hold switch is not turned on, the display unit displays the elapsed time of recording / playback in seconds and the hold switch is turned on. An electronic device characterized by determining whether or not display switching has been performed in the state, and controlling the display to the second unit when the display is switched and displaying to the minute unit when the display is not switched. Equipment power consumption reduction device. The display unit is configured to scroll display a plurality of display information, and performs the scroll display when the hold switch is not turned on, and prohibits the scroll display when the hold switch is turned on. The power consumption reduction device for an electronic device according to claim 1, wherein the device is a power consumption reduction device.

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