JPH07129284A - Battery-driven portable information processing device - Google Patents

Abstract

(57) [Summary] [Object] The present invention is intended to propose a battery-driven information processing apparatus which has low power consumption and is small and lightweight as a whole and has a long usage time. [Structure] Of a plurality of circuit blocks 34, 35, 36,
Power supply switching means 37, 38, 39 for selectively supplying power from the battery 2 only to the circuit blocks required for the designated operation mode, and the selected circuit blocks 34, 3
By providing the operation clock setting means 7 and 40 for setting the operation clock of the circuit block 40 according to the combination of Nos. 5 and 36, it is possible to reduce the power consumption as a whole and to reduce the size and weight. .

Description

Detailed Description of the Invention

[0001]

【table of contents】

 The present invention will be described in the following order. Field of Industrial Application Conventional Technology (FIGS. 7 to 8) Problems to be Solved by the Invention Means for Solving Problems (FIGS. 1 to 4) Actions (FIGS. 1 to 6) Example (1) Overall Configuration (FIG. 1) (2) Circuit configuration (FIGS. 2 to 6) (3) Other embodiments Effect of the invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery-driven portable information processing device, which is suitable for application to, for example, a portable personal information terminal device.

[0003]

2. Description of the Related Art Conventional battery-driven portable information processing devices driven by batteries, such as a desktop personal computer, have a liquid crystal display, a modem circuit, a sound (speaker, microphone) circuit, an infrared communication circuit, and the like. There are some that have various functions by incorporating.

Further, in this type of battery-powered portable information processing apparatus, it is considered that portability can be improved by reducing the weight and size. In this case, it is considered that the entire device can be significantly reduced in weight and size by reducing the size of the battery having a high weight ratio and a high space occupancy ratio with respect to the entire device.

However, since a very large amount of electric power is required to operate each of the above circuits, there is a problem that the battery drive type portable information processing device cannot be used for a long time with a small battery.

In the conventional battery drive type portable information processing device, when the battery terminal voltage becomes lower than a threshold voltage V _{min at} which the system can operate, the system is shut down to prevent malfunction of the system. There is.

That is, as shown in FIG. 7, reference numeral 1 denotes a battery drive type portable information processing apparatus, which has a battery 2 as an entire power source, and a terminal voltage V of the battery 2 is set to stabilize the voltage, for example. It is input to the power supply unit 4 which is a DC / DC converter. The voltage V _CST stabilized by the power supply unit 4 is supplied to the control unit 6, the memory unit 7, the display input unit 8 including a liquid crystal display and a touch screen, and the other circuit unit 9 including a modem circuit or the like. Here, the memory unit 7 is composed of a RAM, a ROM, a memory card, etc., in which necessary information or a program for controlling the whole is written, and the control unit 6 controls the whole by the program.

The terminal voltage V of the battery 2 is input to the voltage detector 5, and when the terminal voltage V becomes equal to or lower than the preset threshold voltage V _min , the detection signal S _DET is output to the control unit 6. It is done like this. Thus, the battery 2
The control unit 6 shuts down the system when the terminal voltage V becomes lower than the threshold voltage V _min , and the malfunction of the system is prevented.

[0009]

However, even when the terminal voltage V of the battery 2 becomes equal to or lower than the threshold voltage V _min , the circuit block such as the control unit 6, the memory unit 7 and the liquid crystal display, which consumes relatively little power, is used. If so, there is a case where the battery capacity that can be sufficiently operated remains in the battery 2.

That is, the terminal voltage V of the battery 2 depends not only on the remaining capacity of the battery 2 but also on the load current i. As shown in FIG. 7, the battery 2 generally has an internal resistance r, which is represented by the battery cell 3 and the internal resistance r. The battery 2 is lower than the terminal voltage V ₁ at the time of no load by a voltage drop ΔV due to the load current i flowing through the internal resistance r, and as a result, the terminal voltage V becomes V ₁ −ΔV.

As a result, when all the circuits formed inside the battery-driven portable information processing device 1 operate simultaneously, the load current i flowing out from the battery 2 increases,
The voltage drop ΔV in the internal resistance r also becomes large. As a result, despite the remaining capacity of battery 2, the terminal voltage V
May decrease and fall below the threshold voltage V _min at which the system can operate.

In this way, the system is shut down even if the battery block 2 which has a relatively small power consumption, such as the control unit 6, the memory unit 7 and the liquid crystal display, still has sufficient battery capacity in the battery 2. Therefore, there is a problem that the power of the battery 2 cannot be effectively used.

In addition, in the battery-driven portable information processing device 1 having such a configuration, power is always supplied to a circuit that does not need to operate in response to a user instruction. Power consumption P _C when the control unit 6, the memory unit 7 and the display input unit 8 operate
Is 100 [mW] and the power consumption P ₁ when all the circuits are operating is 200 [mW], as shown in FIG. 8, the power consumption P ₁ of the battery drive type portable information processing device 1 is as shown in FIG.
Is always 200 [mW] constant. That is, the power of the battery 2 is wasted, and the usable time of the battery 2 is shortened. By this, the battery 2
However, there is a problem that the battery drive type portable information processing device 1 cannot be made smaller and lighter as a whole.

The present invention has been made in consideration of the above points, and it is an object of the present invention to propose a battery-driven information processing apparatus which consumes less power and is smaller and lighter as a whole and has a long operating time. .

[0015]

In order to solve such a problem, in the present invention, the battery 2 supplies power to a plurality of circuit blocks 7, 31, 32, 33, 34, 35, 36, 40 to supply the circuit blocks. 7, 31, 32, 33, 3
In the battery-driven portable information processing device 10 that processes predetermined information by the operations of 4, 35, 36, and 40, the circuit block required for the specified operation mode among the plurality of circuit blocks 34, 35, and 36. Power supply switching means 37, 3 for selectively supplying power from the battery 2 only
8, 39 and selected circuit blocks 34, 35, 36
The operation clock setting means 7 and 40 for setting the operation clock of the circuit block 40 according to the combination of

[0016]

Function: Of the plurality of circuit blocks 34, 35, 36,
Power supply switching means 37, 38, 39 for selectively supplying power from the battery 2 only to the circuit blocks required for the designated operation mode, and the selected circuit blocks 34, 3
By providing the operation clock setting means 7 and 40 for setting the operation clock of the circuit block 40 according to the combination of Nos. 5 and 36, it is possible to reduce the power consumption as a whole and to reduce the size and weight. .

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

(1) Overall Configuration In FIG. 1, reference numeral 10 generally indicates a portable personal information terminal device as a battery drive type information processing device, which comprises an upper casing 11 and a lower casing 12. An opening 13 is formed in a substantially central portion of the surface of the upper casing 11, and the input surface / display surface 14 is exposed from the opening 13.

A power switch 15 is mounted on the upper right portion of the upper casing 11, and the upper casing 11 is further provided.
A transmission / reception unit 16 for non-contact data communication is attached to the upper center of the. The transmitting / receiving unit 16 can transmit / receive data by using infrared rays or other electromagnetic waves. Further, a speaker device 17 which emits a sound is built in the substantially central portion on the left side of the upper casing 11, and a functional switch 18 such as a shift key is mounted on the speaker device 17 above.

A slot 19 for accommodating an information recording medium such as a memory card or a floppy disk is formed on the right side of the lower casing 12. An output terminal 20 for attaching an earphone or the like is formed on one side of the portable personal information terminal device 10, and a module jack 21 for receiving a module is provided on one side of the opposite surface.
Is provided.

On the left side of the portable personal information terminal device 10, female main body side telephone line connectors 22A and 14 made of Tip and Ring connectors are provided.
A body side digital signal connector 23A, which is a pole D sub-connector, is provided on the same surface.

Further, in FIG. 1, reference numeral 24 denotes a telephone device as a whole, which comprises a telephone body 24A and a mounting portion 24B of the portable personal information terminal device 10. A stopper 25 is provided at a substantially central portion on the right side of the mounting portion 24B of the portable personal information terminal device 10 and can be fixed when the portable personal information terminal device 10 is attached.

In addition, a male-type peripheral device side telephone line connector 22B and a 14-pole D-sub that is a chip-and-ring connector is provided at the connection portion with the portable personal information terminal device 10 formed on the side surface portion of the telephone body 24A. A peripheral device side digital signal connector 23B formed of a connector is provided on the same plane. Further, a push button switch 26 is provided in the telephone body 24A, and a user can send a dial pulse by pressing the push button switch 26, whereby a transmission partner can be selected and the receiver 27 can be sent to the transmission partner. You are ready to talk.
Also, a cable 2 with a module is provided on one side of the telephone device 24.
8 and converter 2 that converts and takes in the voltage from the commercial power supply
9 is attached.

(2) Circuit configuration In FIG. 2 in which parts corresponding to those in FIG. 7 are assigned the same reference numerals, 10 indicates a portable personal information terminal device as a whole,
For example, a control unit 40 having a micro computer configuration for controlling each unit is included.

The memory section 7, the liquid crystal display section 31, and the input section 32 are connected to the control section 40, and a basic operation block section 33, which is the basis of the operation, is formed. The memory unit 7 is R
It is an information storage medium such as an OM, a RAM, a memory card, and a floppy disk, and stores an operation command (program) for operating the portable personal information terminal device 10 and various necessary information. The liquid crystal display unit 31 is an LCD
(Liquid Crystal Display) or the like, whereby the portable personal information terminal device 10 can display various information to the user. The input unit 32 is a touch screen such as a tablet, so that the portable personal information terminal device 10 can input the user's instruction information on the screen of the liquid crystal display unit 31.

Further, the control section 40 is connected to a modem circuit section 34, a sound circuit section 35, and a transmission / reception section 36 which are composed of respective functional units. Portable personal information terminal device 10
Is capable of performing data communication using a telephone line by the modem circuit section 34. The sound circuit section 35 is composed of a microphone and a speaker, whereby the portable personal information terminal device 10 can input and output a voice and generate a pseudo sound such as a warning sound. The transmitting / receiving unit 36 is composed of infrared rays or other electromagnetic waves, whereby the portable personal information terminal device 10 can perform data communication with an external device in a non-contact manner.

Further, the portable personal information terminal device 10 has a battery 2 made of, for example, Ni-Cd or Ni-H ₂ , and the battery 2 supplies power to each unit.

The terminal voltage V of the battery 2 is DC / D, for example.
It is connected to the power supply unit 4 composed of a C converter,
As a result, the terminal voltage V is stabilized at the voltage V _CST . Further, the terminal voltage V is input to the voltage detector 5 that monitors the voltage drop, and the detection signal S _DET of the voltage detector 5 is captured by the control unit 40. As a result, when the battery terminal voltage V reaches the predetermined threshold voltage V _min , the control unit 40 shuts down the system, and as a result, malfunction of the system is prevented.

[0029] Here, the memory unit 7, the power input terminals of the liquid crystal display unit 31 and the input unit 32, a voltage V _CST directly connected, is adapted to receive a constantly voltage V _CST. On the other hand, the modem circuit section 34, the sound circuit section 35, and the transmitting / receiving section 3
The power input terminal of 6 receives the voltage V _CST via switching elements (for example, transistor switches) 37, 38 and 39, respectively. The switching elements 37, 38 and 39 are directly connected to the I / O port of the control unit 40 (or via the system controller) and turned on / off by control signals S _CNT1 , S _CNT2 and S _CNT3 from the control unit 40. The state is controlled.

Therefore, the modem circuit section 34, the sound circuit section 35, and the transmitting / receiving section 36 are respectively provided with the switching element 3.
7, 38 and 39 and control signals S _CNT1 , S _CNT2 and S _CNT3
The power supply is controlled by. As described above, the basic operation block unit 33 that requires constant power supply is directly connected to the output terminal of the power supply unit 4 as in the conventional design, and does not need to always operate while constant power is supplied. The control unit 40 controls the power supply of the circuit units (modem circuit unit 34, sound circuit unit 35, and transmission / reception unit 36) that consume relatively large power so that they operate only when necessary.

For example, when outputting sound from the speaker, the control unit 40 switches the switching element 38 of the sound circuit unit 35 to the ON state by the control signal S _CNT2 and supplies power to the sound circuit unit 35. As a result, the sound circuit section 35 changes from the sleep state to the active state,
Sound is output from the speaker. Similarly, the modem circuit section 34 is supplied with power when performing data communication using a telephone line, and the transmitting / receiving section 36 is supplied with power when performing data communication (for example, infrared communication) with an external device. There is.

Thus, by controlling the power supply to the modem circuit section 34, the sound circuit section 35 and the transmitting / receiving section 36 using the switching elements 37, 38 and 39, the overall power consumption is reduced and the power of the battery 2 is reduced. It is designed to be used effectively. That is, in regard to the circuits 34, 35, and 36, which have a low probability of being used at the same time in practice, the power supply is controlled so as to avoid a state where all the circuits are turned on at the same time. As a result, the terminal voltage drop of the battery 2 due to the turning on of all the circuits at the same time is prevented, and the warning alarm signal for the terminal voltage drop of the battery 2 is not generated early.

In addition to the power supply control of each circuit section, in the present invention, the memory section 7 has a look-up table for obtaining the operation clock f [Hz] of the control section 40 as shown in FIG.

The power consumption of the control unit 40 is proportional to the operation clock f [Hz], and the power consumption is reduced as the operation clock f [Hz] becomes slower. When the circuit section operates,
Motion clock f calculated from the backup table f
Since the control unit 40 operates at [Hz], the control unit 40
Power consumption is reduced. As a result, the power consumption P of the portable personal information terminal device 10 as a whole becomes constant.

The look-up table is used as power supply information (switching element 3) to the basic operation block section 33, the modem circuit section 34, the sound circuit section 35, and the transmitting / receiving section 36.
(ON / OFF information of Nos. 7, 38 and 39) is used as a parameter, and the control unit 40 can obtain the operation clock f [Hz] to be selected by the combination of the parameters.

In the look-up table, the operation clock f is represented by the reference frequency F [Hz]. For example, in the basic operation block unit 33, the modem circuit unit 34, and the sound circuit unit 35 being in the ON state and the transmitting / receiving unit 36 being in the OFF state [Table NO4], the operation clock f to be selected is 0.7 × F [Hz]. ] Is required. In the look-up table, the motion clock f
The power consumption P as a whole when [Hz] is selected is calculated, and for example, [Table NO
In 4], 150 [mW] is required as the power consumption P.

Here, the control unit 40 has a clock control register therein, and the control unit 40 uses the value written in the clock control register, for example, N (dynamically rewritable by a program), to control the fundamental frequency in the PLL circuit. It is possible to generate a frequency of 2 N times (for example, 32 [kHz]). As a result, the control unit 40
The motion clock f calculated from the look-up table f
[Hz] is generated, and the operation is performed by the operation clock f [Hz].

Thus, the portable personal information terminal device 10
When the modem circuit unit 34, the sound circuit unit 35, or the transmission / reception unit 36, which has a low probability of being used, operates according to the power supply information of the modem circuit unit 34, the sound circuit unit 35, and the transmission / reception unit 36. The operation clock f [Hz] of the unit 40 is delayed to reduce the power consumption of the control unit 40, and the power consumption P is programmed to be constant as a whole.

Thus, the circuit portion 3 having a low probability of being used
4, 35 and 36 are controlled, and when the circuit section 34, 35 or 36 having a low probability of being used operates, the operation clock f [Hz of the control section 40 is set to reduce the power consumption of the control section 40. ], And the operation clock f [H
By operating the control unit 40 in z], the power consumption P of the portable personal information terminal device 10 becomes constant as a whole and the power consumption P can be reduced.

FIG. 4 shows the overall control procedure of the portable personal information terminal device 10 by the control unit 40. When the power switch 15 is turned on, the control unit 40 initializes the basic operation block unit 33 to operate. After enabling the state, the processing procedure is entered from step SP1 and step SP2 is entered.
In step 1, only the basic operation block section 33 is operated, and the liquid crystal display section 31 displays a picture or a character on the LCD screen. In this state, the control unit 40 waits for an instruction input from the user and maintains the step SP2 until the instruction input is made.

After the lapse of time T _{1 at} step SP2,
When the user touches the input unit 32 formed of a touch screen to perform the modem communication and the infrared communication at the same time and inputs an instruction to output sound from the speaker, the control unit 4
0 moves to the subsequent step SP3 to operate all the circuit parts. That is, in step SP3, the control section 40 turns on the switching elements 37, 38 and 39 to supply power to the modem circuit section 34, the sound circuit section 35 and the transmission / reception section 36. Further, the control unit 40 executes a predetermined process so that the modem circuit unit 34, the sound circuit unit 35, and the transmission / reception unit 36 operate, so that the modem circuit unit 34, the sound circuit unit 35, and the transmission / reception unit 36 operate. Thus, the portable personal information terminal device 10 performs modem communication and infrared communication as instructed by the user and outputs sound from the speaker.

After the lapse of time T _{2 at} step SP3,
When the user touches the touch screen, stops the infrared communication and the voice output from the speaker, and inputs an instruction to perform only the modem communication, the control unit 40 continues the step SP4.
The basic operation block unit 33 and the modem circuit unit 34
Just make it work. That is, the control unit 40 determines the step SP.
4, the switching element 37 is turned on and the switching elements 38 and 39 are turned off so that the basic operation block 33 and the modem circuit 34
Only supply power. Further, the control unit 40 executes a predetermined process so that the modem circuit unit 34 operates, whereby only the basic operation block unit 33 and the modem circuit unit 34 operate, and the sound circuit unit 35 and the transmission / reception unit 36 stop the operation. To do. Thus, the portable personal information terminal device 10 operates so as to stop the infrared communication and the voice output from the speaker and perform only the modem communication as instructed by the user.

After the lapse of time T _{3 at} step SP4,
When the user touches the touch screen and inputs an instruction to output voice from a speaker in addition to modem communication,
The control unit 40 shifts to the next step SP5, and the basic operation block unit 33, the modem circuit unit 34, and the sound circuit unit 35.
And operate. That is, the control unit 40 makes a step SP5.
In the above, the switching element 38 is turned on, power is supplied also to the sound circuit section 35, and predetermined processing is executed so that the sound circuit section 35 operates. As a result, the sound circuit section 35 also operates, and the basic operation block section 33, the modem circuit section 34, and the sound circuit section 35 operate as a whole. Thus, the portable personal information terminal device 10 outputs the voice from the speaker in addition to the modem communication as instructed by the user.

After the lapse of time T _{4 at} step SP5,
When the user touches the touch screen, stops the modem communication and the voice output from the speaker, and inputs an instruction to perform infrared communication, the control unit 40 moves to the following step SP6, and the basic operation block unit 33 and the transmission / reception unit 36. And operate. That is, in step SP6, the control section 40 turns off the switching elements 37 and 38 to stop the power supply to the modem circuit section 34 and the sound circuit section 35, and turns on the switching element 39 to supply power to the transmission / reception section 36. Supply. Further, the control unit 40 executes a predetermined process so that the transmission / reception unit 36 operates. As a result, the modem circuit section 34 and the sound circuit section stop operating, and the transmitting / receiving section 36 operates. Thus, the portable personal information terminal device 10 stops the modem communication and the voice output from the speaker, and performs the infrared communication, as instructed by the user.

After the time T _{5 has} elapsed at step SP6,
When the user touches the touch screen, cancels the infrared communication, and inputs an instruction to put the portable personal information terminal device 10 into the instruction input waiting state, the control unit 40 continues SP7.
Then, only the basic operation block unit 33 is operated.
That is, in step SP7, the control unit 40 sets the switching element 39 to the OFF state so that power is not supplied to the transmission / reception unit 36, and supplies power only to the basic operation block unit 33. As a result, the operation of the transmission / reception unit 36 is stopped, and only the basic operation block unit 33 operates. Thus, the portable personal information terminal device 10 suspends the infrared communication as instructed by the user and waits for an instruction input.

After the time T _{6 has} elapsed at step SP7,
When the power switch 15 is turned off, the control unit 40 performs a shutdown process, and the portable personal information terminal device 1
0 operation is stopped.

In the above processing procedure, the power consumption P _C when the basic operation block unit 33 operates is, for example, 100
[MW], the modem circuit unit 34, the sound circuit unit 35,
The power consumption when the transmission / reception unit 36 operates is, for example, 50 [mW], 30 [mW], and 20 [mW], respectively. As a result, the power consumption becomes 200 [mW] when all the circuit units of the basic operation block unit 33, the modem circuit unit 34, the sound circuit unit 35, and the transmitting / receiving unit 36 are operating.

In addition to the above-described processing procedure, when the circuit units other than the basic operation block unit 33 operate, the operation of the control unit 40 is controlled so that the total power consumption becomes constant, for example, 150 [mW]. Is programmed.

In the above configuration, the switching element 3
FIG. 5 shows the power consumption P ₂ when power is supplied to the modem circuit section 34, the sound circuit section 35, and the transmission / reception section 36 by 7, 38 and 39, and only the necessary circuit sections are operated.

At step SP2, the switching elements 37, 38 and 39 are turned off,
Modem circuit section 34, sound circuit section 35, and transmitting / receiving section 3
No power is supplied to 6, and only the basic operation block unit 33 is supplied with power. As a result, the basic operation block unit 33
Can operate, and the total power consumption P ₂ is 100 [m
W]. Thus, the power consumption of 100 [mW] is reduced as compared with the conventional power consumption P ₁ (FIG. 8).

In step SP3, the switching elements 37, 38 and 39 are turned on, and power is supplied to all the circuit parts. As a result, all the circuit parts can operate and the total power consumption P ₂ becomes 200 [mW].
Thus, the power consumption P ₂ becomes equal to the conventional power consumption P ₁ .

In step SP4, the switching element 37 is turned on, the switching elements 38 and 39 are turned off, and power is supplied only to the basic operation block section 33 and the modem circuit section 34. As a result, only the basic operation block unit 33 and the modem circuit unit 34 can operate, and the total power consumption P ₂ becomes 150 [mW]. Thus, the power consumption of 50 [mW] is reduced as compared with the conventional power consumption P ₁ .

In step SP5, the switching elements 37 and 38 are turned on, the switching element 39 is turned off, and power is supplied only to the basic operation block section 33, the modem circuit section 34, and the sound circuit section 35. As a result, only the basic operation block unit 33, the modem circuit unit 34, and the sound circuit unit 35 can operate, and the total power consumption P ₂ becomes 180 [mW]. Thus, the conventional power consumption P
The electric power of 20 [mW] is reduced compared to ₁ .

In step SP6, the switching element 39 is turned on, the switching elements 37 and 38 are turned off, and the basic operation block section 33 and the transmission / reception section 36 are set.
Only supply power. As a result, only the basic operation block unit 33 and the transmitting / receiving unit 36 can operate, and the total power consumption P ₂ becomes 120 [mW]. Thus, the electric power of 70 [mW] is reduced as compared with the conventional electric power consumption P ₁ .

At step SP7, the switching elements 37, 38 and 39 are turned off, and power is supplied only to the basic operation block section 33. As a result, only the basic operation block unit 33 can operate, and the total power consumption P ₂ becomes 100 [mW]. Thus, the conventional power consumption P ₁
The power consumption is 100 [mW].

In this way, in each step, by controlling the power supply to the circuit section which does not need to be constantly supplied with power, the power consumption P ₂ as a whole is reduced from the conventional power consumption P ₁ (FIG. 8).

Further, as shown in FIG. 6, the power consumption P in the case where the power supply to the circuit unit which does not always need to be supplied is controlled and the operation clock of the control unit 40 is controlled.
₃ is the power consumption P ₂ when the power supply of the circuit unit is controlled
In addition to this, the power consumption is further reduced as compared with the conventional power consumption P ₁ (FIG. 8).

That is, in step SP2, the switching elements 37, 38 and 39 are turned off, so that the modem circuit section 34, the sound circuit section 35 and the transmission / reception section 36 are not supplied with power, and the basic operation block section 3 is provided.
Only 3 is powered. In this case, since only the basic operation block unit 33 operates, the control unit 40 selects F [Hz] as the operation clock f by the look-up table. As a result, the power consumption P _C of the control unit 40 is 100 [mW]
The total power consumption P ₃ becomes 100 [mW]. Thus, the power consumption of 100 [mW] is reduced as compared with the conventional power consumption P ₁ .

At step SP3, the switching elements 37, 38 and 39 are turned on and power is supplied to all the circuit parts. In this case, all the circuit sections operate, so the control section 40 selects 0.5 × F [Hz] as the operation clock f by the look-up table. As a result, the power consumption P _C of the control unit 40 becomes 50 [mW], and the power consumption P ₃ as a whole becomes 150 [mW]. Thus, the power consumption of 50 [mW] is reduced as compared with the conventional power consumption P ₁ .

At step SP4, the switching element 37 is turned on, the switching elements 38 and 39 are turned off, and power is supplied only to the basic operation block section 33 and the modem circuit section 34. In this case, since the basic operation block unit 33 and the modem circuit unit 34 operate, the control unit 40
Is a motion clock f by the backup table and F
Select [Hz]. Accordingly, the power consumption P of the control unit 40
_C becomes 100 [mW], and the total power consumption P ₃ is 1
It becomes 50 [mW]. Thus, it is 50 more than the conventional power consumption P _1.
The power of [mW] is reduced.

In step SP5, the switching elements 37 and 38 are turned on, the switching element 39 is turned off, and power is supplied to the basic operation block section 33, the modem circuit section 34, and the sound circuit section 35. In this case, since the basic operation block unit 33, the modem circuit unit 34, and the sound circuit unit 35 operate, the control unit 40 uses the look-up table as the operation clock f of 0.7 × F [Hz].
Select. As a result, the power consumption P _C of the control unit 40 is 70
[MW], and the total power consumption P ₃ is 150 [mW]
become. Thus, the power consumption of 50 [mW] is reduced as compared with the conventional power consumption P ₁ .

In step SP6, the switching element 39 is turned on, the switching elements 37 and 38 are turned off, and the basic operation block section 33 and the transmission / reception section 36 are set.
Supply power to. In this case, since the basic operation block unit 33 and the transmission / reception unit 36 operate, the control unit 40 selects F [Hz] as the operation clock f based on the look-up table. As a result, the power consumption P _C of the control unit 40 is 100 [m
W], and the total power consumption P ₃ becomes 120 [mW]. Thus, the power consumption of 80 [mW] is reduced as compared with the conventional power consumption P ₁ .

At step SP7, the switching elements 37, 38 and 39 are turned off,
Modem circuit section 34, sound circuit section 35, and transmitting / receiving section 3
No power is supplied to 6, and only the basic operation block unit 33 is supplied with power. In this case, since only the basic operation block unit 33 operates, the control unit 40 selects F [Hz] as the operation clock f by the look-up table. As a result, the power consumption P _C of the control unit 40 becomes 100 [mW],
The power consumption P ₃ as a whole becomes 100 [mW]. Thus, the power consumption of 100 [mW] is reduced as compared with the conventional power consumption P ₁ .

The circuit portion 3 having a low probability of being used in this way
When 4, 35 or 36 operates, the control unit 40 turns on the corresponding switching element 37, 38 or 39 by a control signal to supply power to the circuit unit 34, 35 or 36. As a result, the portable personal information terminal device 10
The power consumption is reduced as a whole, and the power of battery 2 is effectively used.

Further, the control unit 40 controls the switching element 3
In accordance with the ON information of 7, 38 or 39, the operation clock f [Hz] for reducing the power consumption of the control unit 40 is obtained from the look-up table, and the operation clock f [Hz] is generated by the PLL circuit and the operation clock f [Hz] is generated. It operates based on f [Hz]. As a result, the power consumption of the portable personal information terminal device 10 is further reduced, and the power of the battery 2 is used more effectively. In this case, the power consumption as a whole is made constant, and even when the battery capacity of the battery 2 is reduced, the terminal voltage V of the battery 2 is suddenly increased when the circuit portion 34, 35 or 36 having a low probability of being used is operated. Is prevented and thus the system is prevented from prematurely shutting down.

According to the above construction, the switching elements 37, 37 are respectively connected to the power source input terminals of the modem circuit section 34, the sound circuit section 35, and the transmitting / receiving section 36, which are less likely to be used.
38 and 39 are provided to control power supply to the modem circuit section 34, the sound circuit section 35, and the transmission / reception section 36, and
Modem circuit section 34, sound circuit section 35, and transmitting / receiving section 3
The operation clock f for reducing the power consumption of the control unit 40 is obtained from the look-up table according to the power supply information of No. 6, and the control unit is operated by the operation clock f, so that the portable personal information terminal device 10 as a whole. The power consumption can be reduced.

By the way, by lowering the power consumption, the operating time of the battery 2 can be lengthened, and by reducing the power consumption, the battery 2 can be downsized, and the portable personal information terminal device 10 can be downsized as a whole. The weight can be reduced.

(3) Other Embodiments In the above-mentioned embodiments, the case where the switching elements 37, 38 and 39 are provided at the power source input terminals of the modem circuit section 34, the sound circuit section 35 and the transmission / reception section 36 has been described. However, the present invention is not limited to this, and for example, the liquid crystal display unit 3
When a switching element is provided at the power input terminal of No. 1 and there is no instruction input from the user for a certain time, the liquid crystal display unit 3
Even when the power is not supplied to No. 1, the same effect as the above case can be obtained. In short, the same effect can be obtained by supplying power when the circuit section operates.

Further, in the above-mentioned embodiment, the case where the present invention is applied to the portable personal information terminal device 10 driven by the battery 2 is described, but the present invention is not limited to this, and for example, a portable facsimile or a portable personal information terminal. The present invention can be applied to various information processing devices driven by batteries (or batteries) such as computers.

[0070]

As described above, according to the present invention, a switching element is provided at the power source input terminal of each circuit section having a low probability of being used to control the power supply of each circuit section, and the power source of each circuit section is controlled. By obtaining an operation clock that lowers the power consumption of the control unit according to the supply information and operating the control unit with the operation clock, it is possible to obtain a battery-powered portable information processing device with low power consumption as a whole.

As a result, it is possible to obtain a battery-driven portable information processing device which is compact and lightweight and has a long usage time as a whole.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a battery-driven portable information processing device according to the present invention.

FIG. 2 is a block diagram showing a circuit configuration of a battery-powered portable information processing device according to the present invention.

FIG. 3 is a look-up table for obtaining a motion clock f.

FIG. 4 is a flow chart showing a processing procedure of a battery-driven portable information processing device according to the present invention.

FIG. 5 is a signal waveform diagram showing power consumption P ₂ of the present invention.

FIG. 6 is a signal waveform diagram showing power consumption P _{3 according} to the present invention.

FIG. 7 is a block diagram showing a conventional circuit configuration.

FIG. 8 is a signal waveform diagram showing conventional power consumption P ₁ .

[Explanation of symbols]

1 ... Battery drive type portable information processing device, 2 ... Battery, 3 ... Battery cell, 4 ... Power supply unit, 5 ... Voltage detector, 6, 40 ... Control unit, 7 ... Memory unit, 8 ...... Display input unit, 9 ...... Other circuit unit, 10 ...... Portable personal information terminal device, 14 ...... Input and display surface, 15 ...... Power switch, 16 ...... Transmission / reception unit, 17 Speaker device, 18 ... …
Function switch, 19 …… Slot, 20 …… Output terminal,
21 ... Module, 24 ... Telephone device, 26 ...
... push button switch, 27 ... receiver, 28 ... modular cable, 29 ... converter, 31 ... liquid crystal display section, 32 ... input section, 33 ... basic operation block section, 3
4 ... Modem circuit section, 35 ... Sound circuit section, 36 ...
... Transmitting / receiving unit, 37 to 39 ... Switching element.

Claims (1)

[Claims] 1. A battery-driven portable information processing device, wherein power is supplied to a plurality of circuit blocks by a battery and predetermined information is processed by the operation of the circuit block, wherein one of the plurality of circuit blocks is designated. Power supply switching means for selectively supplying power from the battery only to the circuit block required for the selected operation mode, and the operation clock setting for setting the operation clock of the circuit block according to the combination of the selected circuit block. A battery-powered portable information processing device comprising: