JP4113103B2 - Mobile terminal device - Google Patents

Description

  The present invention relates to a mobile terminal device using a battery as a power source, such as a mobile phone or a PDA (Personal Digital Assistants).

  In mobile terminal devices that use batteries, such as mobile phones and PDAs, the operation mode of the device is reduced from the normal mode in response to a decrease in the remaining battery level in order to extend the operation duration as much as possible with a limited battery capacity. A method of sequentially switching to a mode and a power-off mode is widely used. In addition, in order to appropriately switch the operation mode, a method for accurately detecting the remaining battery level has also been proposed (see, for example, Patent Document 1).

  Here, the battery remaining amount detection and the mode switching operation in the conventional portable terminal device will be described. In this portable terminal device, before executing a predetermined task (for example, device access), the remaining battery level is detected by performing a simulated operation of the task on the circuit. FIG. 12 is a block diagram showing an internal configuration of a conventional portable terminal device. The portable terminal device 700 mainly includes a terminal function unit 1, a battery unit 2, a stabilized power supply unit 3, a battery state detection unit 4, and an operation. The mode switching instruction unit 10 and the discharge capacity measuring means 20 are configured.

  The terminal function unit 1 is a block that implements various functions such as communication, input, and display of the mobile terminal device 700. The battery unit 2 supplies power to the entire mobile terminal device 700. The stabilized power supply unit 3 stabilizes the voltage of the battery unit 2 and supplies power to the terminal function unit 1. The battery state detection unit 4 detects the voltage value of the battery unit 2 and outputs it to the operation mode switching instruction unit 10 described later. The operation mode switching instruction unit 10 instructs the switching of the operation mode by comparing the voltage value output from the battery state detection unit with a threshold voltage that is arbitrarily set in advance.

  The discharge capacity measuring means 20 performs a device access pseudo operation according to an instruction from the terminal function unit 1, measures a voltage at that time, and outputs the measured voltage to the operation mode switching instruction unit 10. The operation mode switching instruction unit 10 instructs the switching of the operation mode by comparing the voltage during the device access pseudo operation output from the discharge capacity measuring means 20 with the threshold voltage. For example, when the voltage during the device access pseudo operation becomes lower than the threshold voltage, the terminal function unit 1 is notified of the change of the operation mode due to the voltage drop.

  Next, the mode switching operation of the portable terminal device having the above configuration will be specifically described. FIG. 13 is a diagram illustrating discharge characteristics of a battery unit of a conventional portable terminal device. L10 is a first discharge characteristic curve showing the relationship between the discharge capacity and voltage of the battery unit 2 when the terminal function unit 1 is not performing a device access operation and the current value is small. On the other hand, L20 is a second discharge characteristic curve showing the relationship between the discharge capacity and voltage of the battery unit 2 when the current value is large due to the device access operation.

  Vs is a power saving mode switching threshold voltage. When the voltage at the time of device access pseudo operation is lower than Vs, the operation mode switching instruction unit 10 notifies the terminal function unit 1 of changing the operation mode to the power saving mode. . Further, Vth is a power-off switching threshold voltage, and when the device access pseudo operation voltage is lower than Vth, the operation mode switching instructing unit 10 notifies the terminal function unit 1 of changing the operation mode to the power-off mode. Do.

  As described above, before the device access operation is actually performed, a pseudo operation is performed by the discharge capacity measuring means 20, and the discharge capacity of the battery unit 2 is measured, whereby the mode switching operation to the power saving mode or the power off mode is performed. Can be performed appropriately.

Japanese Patent Laid-Open No. 11-305858 (page 3, FIG. 1)

  However, since the above-described conventional mobile terminal device performs a pseudo operation before executing a predetermined task, the pseudo operation itself is a waste of power, or a problem that an extra operation time is required for the pseudo operation. was there. Also, for example, in the case of a task that consumes a large amount of current in a short time, the voltage value returns to a place close to the original value after the task is completed, so the mode is temporarily switched to the power saving mode and then the normal operation mode again. There is also a problem in that an unnecessary mode switching operation inevitably occurs to return to.

  Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a mobile terminal device that can predict a voltage value at the time of task execution in advance without performing a pseudo operation. Furthermore, it aims at providing the portable terminal device which can suppress the mode switching operation before and after task execution.

  In order to solve the above-described problem, the mobile terminal device of the present invention is a mobile terminal device that switches an operation mode according to a power supply state, the power supply state detection unit that detects a voltage value of the power supply, and the power supply state detection unit Compares the detected voltage value with a predetermined threshold value to instruct an operation mode switching instruction unit to switch the operation mode, an input task notification means for notifying the next execution candidate task of the operating system, and power consumption for each task Task power consumption characteristic storage means for storing characteristics, and voltage change prediction means for predicting a voltage value when a next execution candidate task is executed with reference to the power consumption characteristics, the voltage change prediction means, In response to the notification from the input task notification means, the next execution candidate obtained by referring to the voltage value detected by the power state detection unit and the task power consumption characteristic storage means Calculating the difference between the voltage value drops when the running disk as predicted voltage value.

  According to the above configuration, power consumption characteristic data for each task executed by the operating system is stored in advance, and when the next task to be executed is determined, the task is executed by referring to the power consumption characteristic data related to the task. By calculating the voltage drop in this case, it is possible to predict a voltage change at the time of task execution without performing a pseudo operation, prevent waste of power due to the pseudo operation, and reduce an extra operation time.

  The present invention further includes a mode switching mask unit that suppresses an operation mode switching instruction of the operation mode switching instruction unit, wherein the voltage change prediction unit has the predicted voltage value lower than a switching threshold voltage value in a power saving mode. And when it becomes higher than the switching threshold voltage value of the power-off mode, a mask signal is output to the mode switching mask section.

  According to the above configuration, even when it is determined that the operation mode is switched based on the prediction of the voltage value, the mask signal is output in response to the operation mode switching instruction. Unnecessary mode switching operation to the power saving mode can be prevented.

  In the present invention, when the voltage value detected by the power state detection unit is lower than the switching threshold voltage in the power off mode, the operation mode switching instruction unit instructs the power off. According to the above configuration, since a normal power-off operation is immediately and forcibly performed, abnormal termination such as a power-off during the operation is prevented.

  The portable terminal device of the present invention is a portable terminal device that switches an operation mode according to a power supply state, the power supply state detection unit detecting a current voltage value and a current value of the power supply, and the power supply state detection unit Compares the detected voltage value with a predetermined threshold value to instruct an operation mode switching instruction unit to switch the operation mode, an input task notification means for notifying the next execution candidate task of the operating system, and power consumption for each task Refer to the task power consumption characteristic storage means for storing characteristics, the discharge capacity calculation means for calculating the discharge capacity of the power supply from the product of the voltage value and the current value detected by the power supply state detection unit, and the power consumption characteristic means. Voltage change prediction means for predicting a voltage value when the next execution candidate task is executed, and the voltage change prediction means receives a notification from the input task notification means, The sum of the current value detected by the power supply state detection unit and the current value that decreases when the next execution candidate task acquired by referring to the task power consumption characteristic storage unit is executed as the predicted current value. The discharge capacity calculation means outputs to the voltage change prediction means a predicted voltage value calculated by dividing the discharge capacity by the predicted current value. According to the above configuration, since the voltage change at the time of task execution is predicted from the current discharge capacity of the battery unit, the voltage change at the time of task execution can be predicted with higher accuracy.

  In the present invention, it further includes a mode switching mask unit for suppressing an operation mode switching instruction of the operation mode switching instruction unit, and the voltage change prediction unit is configured such that the predicted voltage value is greater than a threshold voltage value in a power saving mode. When it is low and becomes higher than the threshold voltage value in the power-off mode, a mask signal is output to the mode switching mask unit. According to the above configuration, an unnecessary mode switching operation from the normal operation mode to the power saving mode can be prevented during task execution.

  In the present invention, when the voltage value detected by the power state detection unit is lower than the switching threshold voltage in the power off mode, the operation mode switching instruction unit instructs the power off. According to the above configuration, since a normal power-off operation is immediately and forcibly performed, abnormal termination such as power-off during the operation is prevented.

  In the present invention, it further includes an input task permission means for notifying whether or not the execution candidate task can be executed, and when the predicted voltage value is smaller than a switching threshold voltage in a power-off mode, the voltage change prediction means includes the input task. An input prohibition notice is output to the permission means, and the operating system ends in error without executing the execution candidate task. According to the above configuration, the execution of tasks with large power consumption is restricted, so that the operation duration can be prolonged and abnormal termination during operation can be prevented.

  In the present invention, it further comprises timer means for transmitting the mask signal to the mode switching mask section for a predetermined period based on an instruction from the voltage change prediction means, and the task power consumption characteristic storage means is configured to execute a task. The necessary current value and data of a period during which the current flows are stored, and the voltage change prediction unit receives a notification of a next execution candidate task from the input task notification unit and refers to the task power consumption characteristic storage unit. Based on the current value necessary for the execution of the task acquired in the above and the period during which the current flows, an instruction to transmit the mask signal only during the period during which the current flows is output to the timer means. According to the above configuration, since the suppression of the mode switching operation is kept to a minimum, the operation of detecting the battery voltage and switching to the appropriate operation mode can be maintained.

  In the present invention, it further comprises an end task notification means for notifying the next end candidate task of the operating system, and the voltage change prediction means is detected by the power supply state detection unit in response to the notification from the end task notification means. The difference between the measured current value and the current value that decreases when the next completion candidate task acquired with reference to the task power consumption characteristic storage means is output to the discharge capacity calculation means as a predicted current value, The discharge capacity calculation means outputs a predicted voltage value calculated by dividing the discharge capacity by the predicted current value to the voltage change prediction means. According to the above configuration, the voltage change at the end of the task can be predicted in advance.

  In the present invention, the voltage change predicting means outputs a mask signal to the mode switching mask unit when the predicted voltage value is higher than a threshold voltage value in a power saving mode. According to the above configuration, unnecessary mode switching operation from the power saving mode to the normal operation mode can be prevented at the end of the task.

  In the present invention, the power consumption characteristic of the execution candidate task is stored in the power consumption characteristic storage unit when the notification is received from the input task notification unit, and when the notification is received from the end task notification unit A characteristic updating unit is provided for deleting the power consumption characteristic of the end candidate task from the power consumption characteristic storage means. According to the above configuration, the memory size of the task power consumption characteristic table can be minimized.

  According to the present invention, since a voltage value at the time of task execution is predicted in advance without a pseudo operation, power consumption and operation time required for the pseudo operation can be reduced. Furthermore, for example, even when it is determined that the voltage drops to the range of the power saving mode due to the execution of the task, the mode switching operation at the time of task execution is suppressed by the output of the mask signal. Temporary and unnecessary mode switching operations can be prevented.

(Embodiment 1)
FIG. 1 is a block diagram showing an internal configuration of the mobile terminal device according to Embodiment 1 of the present invention. The mobile terminal device 100 includes a terminal function unit 1, a battery unit 2, a stabilized power supply unit 3, a battery state detection unit 4, an operation mode switching instruction unit 10, a mode switching mask unit 30, an operating system 40, and a task power consumption characteristic table 50. The voltage change predicting means 60 is provided.

  The battery state detection unit 4 detects the voltage value of the battery unit 2 and outputs it to the operation mode switching instruction unit 10 and the voltage change prediction unit 60. The operation mode switching instruction unit 10 compares the voltage value notified by the battery state detection unit 4 with a threshold voltage, and when the voltage value is lower than the threshold voltage, notifies the operation mode switching due to the voltage drop. The mode switching mask unit 30 receives a mask signal output from a voltage change prediction unit 60 described later, suppresses the mode switching notification output from the operation mode switching instruction unit 10, and the terminal function unit 1 performs mode switching. Prevent it from being executed. The operating system 40 is software that controls the operation of the mobile terminal device 100 as a whole, and includes a task scheduler 41 that controls the execution of tasks on the operating system 40.

  The task scheduler 41 further stores the execution waiting task storage means 42 for storing the next execution candidate task in the task scheduler 41, the executing task storage means 43 for storing the executing task, and the execution waiting task storage means 42. The input task notification means 44 for notifying the next execution candidate task that has been executed immediately before the task scheduler 41 shifts to the execution state.

  The task power consumption characteristic table 50 is a data table stored in a memory (not shown), and stores a voltage value that decreases when a task is executed for each task. When the task is queried as a key, the task power consumption characteristic table 50 returns a voltage value that decreases due to the execution of the task.

  The voltage change prediction unit 60 receives the notification of the execution candidate task from the input task notification unit 44, and obtains the predicted voltage value from the difference between the current voltage value and the voltage value obtained by referring to the task power consumption characteristic table 50. Further, the predicted voltage value is compared with the power saving mode switching threshold voltage or the power-off switching threshold voltage, and if necessary, a mask signal is output to the mode switching mask unit 30.

  FIG. 2 is a flowchart showing a procedure of voltage change prediction operation of the mobile terminal device according to the first embodiment of the present invention. First, when the input task notification unit 44 notifies the voltage change prediction unit 60 of the next execution candidate task (step S101), the voltage change prediction unit 60 refers to the task power consumption characteristic table 50 with the execution candidate task as a key. (Step S102), a voltage value is acquired (Step S103). On the other hand, the battery state detection unit 4 detects the current voltage value of the battery unit 2 at all times or in a predetermined cycle (step S104), and outputs it to the voltage change prediction means 60.

  The voltage change prediction unit 60 calculates a predicted voltage value by subtracting the voltage value inquired in the task power consumption characteristic table 50 from the voltage value output from the battery state detection unit 4 (step S105). The voltage change prediction unit 60 compares the calculated predicted voltage value with a threshold value (step S106). If the predicted voltage value is smaller than the power saving mode switching threshold voltage and larger than the power-off switching threshold voltage, the mode switching mask is used. A mask signal is output to the unit 30 (step S107). Thus, an unnecessary mode switching operation in which a predetermined task is executed to temporarily shift from the normal operation mode to the power saving mode and then return to the normal execution mode again can be prevented.

  FIG. 3 is a diagram showing discharge characteristics of the battery unit of the mobile terminal device according to Embodiment 1 of the present invention. L1 is a first discharge characteristic curve showing the relationship between the discharge capacity and voltage of the battery unit 2 when the current value is small before notification from the input task notification means 44. On the other hand, L2 is a second discharge indicating the relationship between the discharge capacity and the voltage of the battery unit 2 during execution of the task calculated based on the predicted voltage output from the voltage change predicting means 60 after the notification from the input task notifying means 44. It is a characteristic curve.

  Vs is a power saving mode switching threshold voltage, and when the voltage notified by the battery state detection unit 4 is lower than Vs, the operation mode switching instruction unit 10 notifies the terminal function unit 1 of changing the operation mode to the power saving mode. Go to. Further, Vth is a power-off switching threshold voltage, and when the voltage notified by the battery state detection unit 4 is lower than Vth, the operation mode switching instruction unit 10 notifies the terminal function unit of changing the operation mode to the power-off mode. Go to 1.

  According to the portable terminal device having the above-described configuration, a voltage change at the time of task execution is predicted in advance without performing a pseudo operation, so that waste of power due to the pseudo operation can be prevented and an extra operation time can be reduced. Further, an unnecessary mode switching operation from the normal operation mode to the power saving mode can be prevented by detecting task execution in advance and transmitting a mode switching mask signal. Further, when the detection voltage is lower than the switching threshold voltage in the voltage off mode, the normal power off operation is immediately and forcibly performed, so that abnormal termination such as power off during operation is prevented.

(Embodiment 2)
FIG. 4 is a block diagram showing an internal configuration of the mobile terminal device according to Embodiment 2 of the present invention. The mobile terminal device 200 of the second embodiment is different from the mobile terminal device 100 of the first embodiment in that the discharge capacity calculating means 70 is added and the data content held in the task power consumption characteristic table 51 is different. Different.

  The battery state detection unit 4 detects the voltage value and current value of the battery unit 2 and notifies the operation mode switching instruction unit 10, the voltage change prediction unit 61, and the discharge capacity calculation unit 70. The discharge capacity calculation means 70 calculates the discharge capacity of the battery unit 2 from the notified voltage value and current value. The calculated discharge capacity is divided by the predicted current value output by the voltage change prediction unit 61 to calculate a predicted voltage value, which is output to the voltage change prediction unit 61.

  The task power consumption characteristic table 51 is a data table stored in a memory (not shown), and stores a current consumption value necessary for executing a task for each task. When the task is referred to as a key, the task power consumption characteristic table 51 returns the current consumption value required by the task.

  The voltage change prediction unit 61 receives the notification of the execution candidate task from the input task notification unit 44, and discharges the predicted current value calculated by summing the current consumption value of the execution candidate task and the current current value of the battery unit 2. Output to capacity calculation means 70.

  FIG. 5 is a flowchart showing a procedure of voltage change prediction operation of the mobile terminal device according to the second embodiment of the present invention. First, when the input task notification means 44 notifies the voltage change prediction means 61 of the next execution candidate task (step S201), the voltage change prediction means 61 makes an inquiry to the task power consumption characteristic table 51 with the execution candidate task as a key. (Step S202), a current consumption value is acquired (Step S203). On the other hand, the battery state detection unit 4 detects the current value of the battery unit 2 constantly or at a predetermined cycle (step S204), and notifies the voltage change prediction means 61 of the current value.

  The voltage change prediction unit 61 adds the current consumption value acquired from the task power consumption characteristic table 51 and the current value notified from the battery state detection unit 4 (step S205), and supplies the predicted current value to the discharge capacity calculation unit 70. Output (step S206). The discharge capacity calculation means 70 calculates a predicted voltage value from the predicted current value (step S207) and outputs it to the voltage change prediction means 61 (step S208). The voltage change prediction means 61 compares the acquired predicted voltage value with a threshold value (step S209), and when the predicted voltage value is smaller than the power saving mode switching threshold voltage and larger than the power-off switching threshold voltage, the mode switching mask is used. A mask signal is output to the unit 30 (step S210). Thus, an unnecessary mode switching operation in which a predetermined task is executed to temporarily shift from the normal operation mode to the power saving mode and then return to the normal execution mode again can be prevented.

  Since the mode switching operation of the operation mode switching instruction unit 10 is the same as that of the first embodiment, the description thereof is omitted.

  According to the portable terminal device having the above configuration, since the voltage change at the time of task execution is predicted from the current discharge capacity of the battery unit, the voltage change at the time of task execution can be predicted with higher accuracy. Further, by detecting the end of the task in advance and transmitting a mode switching mask signal, an unnecessary mode switching operation from the normal operation mode to the power saving mode can be prevented. Further, when the detection voltage is lower than the switching threshold voltage in the voltage off mode, the normal power off operation is immediately and forcibly performed, so that abnormal termination such as power off during operation is prevented.

(Embodiment 3)
FIG. 6 is a block diagram showing an internal configuration of the mobile terminal device according to Embodiment 3 of the present invention. The portable terminal device 300 according to the third embodiment is different from the portable terminal device 200 according to the second embodiment in that the input task permission unit 45 is added.

  When the submission task permission unit 45 receives the execution candidate task submission prohibition notification from the voltage change prediction unit 62, the submission task permission unit 45 stops the execution of the execution candidate task of the operating system 40 and ends the error.

  FIG. 7 is a flowchart showing a procedure of voltage change prediction operation of the mobile terminal device in the third embodiment of the present invention. First, a voltage change prediction operation based on notification of the next execution candidate task from the input task notification unit 44 is performed (step S301). Since this operation is equivalent to the voltage change prediction operation (that is, all procedures from step S201 to step S210 shown in the flowchart of FIG. 5) in the mobile terminal device of the second embodiment, description thereof is omitted.

  Next, the voltage change prediction unit 62 determines that the predicted voltage value is smaller than the power-off switching threshold voltage in the voltage change prediction operation in step S301 (that is, the process proceeds to the step indicated by “A” in the flowchart of FIG. 5). ), A submission prohibition notice is output to the submission task permission means 45 (step S302). Upon receiving the submission prohibition notice, the submission task permission means 45 causes the operating system 40 to stop the next task execution (step S303).

  Since the mode switching operation of the operation mode switching instructing unit 10 is the same as that of the mobile terminal device of the first embodiment, the description thereof is omitted.

  According to the mobile terminal device having the above configuration, when it is determined that the remaining battery level is low enough to prevent the terminal function from being normally maintained by executing the task, the execution of the task with large power consumption is limited. Prevents prolonged or abnormal termination during operation.

(Embodiment 4)
FIG. 8 is a block diagram showing an internal configuration of the mobile terminal device according to Embodiment 4 of the present invention. The portable terminal device 400 of the fourth embodiment is different from the portable terminal device 200 of the second embodiment in that a timer 80 is added between the voltage change prediction unit 63 and the mode switching mask unit 30. Further, the task power consumption characteristic table 52 is different in that a consumption period in which the consumption current flows in addition to a necessary consumption current value is stored for each task.

  When the next execution candidate task is notified from the input task notification unit 44, the voltage change prediction unit 63 refers to the task power consumption characteristic table 52 and acquires the current consumption value and the consumption period. When the voltage change prediction unit 63 transmits a mask signal to the mode switching mask unit 30, the timer 80 transmits the mask signal for the duration of the consumption period. Other configurations, voltage change prediction operation, and mode switching operation are the same as those of the mobile terminal device of the second embodiment, and thus description thereof is omitted.

  According to the portable terminal device having the above configuration, since the suppression of the mode switching operation is kept to a minimum, the operation of detecting the battery voltage and switching to an appropriate operation mode can be maintained.

(Embodiment 5)
FIG. 9 is a block diagram showing an internal configuration of the mobile terminal device according to Embodiment 5 of the present invention. The mobile terminal device 500 according to the fifth embodiment is different from the mobile terminal device 200 according to the second embodiment in that an end task notification unit 46 is added to the task scheduler 41 on the operating system 40.

  The end task notification means 46 notifies the end candidate task stored in the running task storage means 43 immediately before the task scheduler 41 moves to the end state.

  FIG. 10 is a flowchart showing the procedure of the voltage change prediction operation of the mobile terminal device in the fifth embodiment of the present invention. First, a voltage change prediction operation based on notification of the next execution candidate task from the input task notification unit 44 is performed (step S401). This operation is equivalent to the voltage change prediction operation (that is, all the procedures from step S201 to step S210 shown in the flowchart of FIG. 5) in the mobile terminal device of the second embodiment, and thus description thereof is omitted.

  Next, when the end task notification means 46 notifies the voltage change prediction means 64 of the next end candidate task (step S402), the voltage change prediction means 64 makes an inquiry to the task power consumption characteristic table 51 using the end candidate task as a key. (Step S403), and the current consumption value is acquired (Step S404). On the other hand, the battery state detection unit 4 detects the current value of the battery unit 2 constantly or at a predetermined cycle, and outputs the current value to the voltage change prediction unit 64 (step S405).

  The voltage change prediction unit 64 subtracts the current consumption value acquired from the task power consumption characteristic table 51 from the current value detected by the battery state detection unit 4 (step S406), and uses the calculated value as the predicted current value to calculate the discharge capacity. 70 (step S407). The discharge capacity calculation means 70 calculates a predicted voltage value from the predicted current value (step S408) and outputs it to the voltage change prediction means 64 (step S409). The voltage change prediction unit 64 compares the acquired predicted voltage value with a threshold value (step S410), and outputs a mask signal to the mode switching mask unit 30 when the acquired predicted voltage value is larger than the power saving mode switching threshold voltage. (Step S411). Thus, an unnecessary mode switching operation in which a predetermined task is completed to temporarily shift from the power saving mode to the normal operation mode and then return to the power saving mode again is prevented.

  Since the mode switching operation of the operation mode switching instructing unit 10 is the same as that of the mobile terminal device of the first embodiment, the description thereof is omitted.

  According to the portable terminal device having the above configuration, it is possible to predict a voltage change at the end of a task in advance. Further, by detecting the end of the task in advance and transmitting a mode switching mask signal, unnecessary switching operation from the power saving mode to the normal operation mode can be prevented.

(Embodiment 6)
FIG. 11 is a block diagram showing an internal configuration of the mobile terminal device according to Embodiment 6 of the present invention. The mobile terminal device 600 of the sixth embodiment is different from the mobile terminal device 500 of the fifth embodiment in that a characteristic table update unit 90 is added.

  When the characteristic table update unit 90 receives a notification from the input task notification unit 44, the characteristic table update unit 90 newly registers the power consumption characteristic of the input candidate task in the task power consumption characteristic table 53. The power consumption characteristic of the end candidate task is deleted from the power characteristic table 53.

  Since the data indicating the power consumption characteristic is updated as needed, a cumulative increase in the data of the task power consumption characteristic table 53 can be prevented. Other configurations, voltage change prediction operation, and mode switching operation are the same as those of the mobile terminal device of the fifth embodiment, and thus description thereof is omitted.

  According to the portable terminal device having the above configuration, the memory size of the task power consumption characteristic table can be minimized.

  Since the portable terminal device of the present invention predicts the voltage value at the time of task execution without any pseudo operation, it has the effect of reducing the power consumption and operation time required for the pseudo operation. This is useful as a portable terminal device using a battery as a power source, such as Assistants).

The block diagram which shows the internal structure of the portable terminal device in Embodiment 1 of this invention. The flowchart which shows the procedure of the voltage change prediction operation | movement of the portable terminal device in Embodiment 1 of this invention. The figure which shows the discharge characteristic of the battery part of the portable terminal device in Embodiment 1 of this invention The block diagram which shows the internal structure of the portable terminal device in Embodiment 2 of this invention. The flowchart which shows the procedure of the voltage change prediction operation | movement of the portable terminal device in Embodiment 2 of this invention. The block diagram which shows the internal structure of the portable terminal device in Embodiment 3 of this invention. The flowchart which shows the procedure of the voltage change prediction operation | movement of the portable terminal device in Embodiment 3 of this invention. The block diagram which shows the internal structure of the portable terminal device in Embodiment 4 of this invention. The block diagram which shows the internal structure of the portable terminal device in Embodiment 5 of this invention. The flowchart which shows the procedure of the voltage change prediction operation | movement of the portable terminal device in Embodiment 5 of this invention. The block diagram which shows the internal structure of the portable terminal device in Embodiment 6 of this invention. The block diagram which shows the internal structure of the conventional portable terminal device The figure which shows the discharge characteristic of the battery part of the conventional portable terminal device

Explanation of symbols

2 battery unit 4 battery state detection unit 10 operation mode switching instruction unit 20 discharge capacity measurement unit 30 mode switching mask unit 40 operating system 41 task scheduler 44 input task notification unit 45 input task permission unit 46 end task notification unit 50, 51, 52 , 53 Task power consumption characteristic table 60, 61, 62, 63, 64, 65 Voltage change prediction means 70 Discharge capacity calculation means 80 Timer 90 Characteristic table update unit

Claims (11)

A portable terminal device that switches an operation mode according to a power state,
A power supply state detector for detecting a voltage value of the power supply;
An operation mode switching instruction section that compares the voltage value detected by the power supply state detection section with a predetermined threshold and instructs switching of the operation mode;
A submission task notification means for notifying the next execution candidate task of the operating system;
Task power consumption characteristic storage means for storing power consumption characteristics for each task;
Voltage change prediction means for predicting the voltage value when the next execution candidate task is executed with reference to the power consumption characteristics,
In response to the notification from the input task notification unit, the voltage change prediction unit obtains the voltage value detected by the power supply state detection unit and the next execution candidate task acquired by referring to the task power consumption characteristic storage unit. A mobile terminal device that calculates a difference from a voltage value that decreases when executed as a predicted voltage value. A mode switching mask unit for suppressing an operation mode switching instruction of the operation mode switching instruction unit;
The voltage change prediction means outputs a mask signal to the mode switching mask unit when the predicted voltage value is lower than a switching threshold voltage value in a power saving mode and higher than a switching threshold voltage value in a power-off mode. Item 2. The mobile terminal device according to Item 1.   3. The mobile terminal device according to claim 1, wherein when the voltage value detected by the power state detection unit is lower than a switching threshold voltage in a power off mode, the operation mode switching instruction unit instructs the power off. A portable terminal device that switches an operation mode according to a power state,
A power supply state detection unit for detecting a current voltage value and a current value of the power supply;
An operation mode switching instruction section that compares the voltage value detected by the power supply state detection section with a predetermined threshold and instructs switching of the operation mode;
A submission task notification means for notifying the next execution candidate task of the operating system;
Task power consumption characteristic storage means for storing power consumption characteristics for each task;
A discharge capacity calculating means for calculating a discharge capacity of the power supply from a product of a voltage value and a current value detected by the power supply state detection unit;
Voltage change prediction means for predicting the voltage value when the next execution candidate task is executed with reference to the power consumption characteristic means, and
In response to the notification from the input task notification unit, the voltage change prediction unit obtains a current value detected by the power supply state detection unit and a next execution candidate task acquired by referring to the task power consumption characteristic storage unit. Output to the discharge capacity calculation means as a predicted current value the sum of the current value that decreases when executed,
The discharge capacity calculation unit is a portable terminal device that outputs a predicted voltage value calculated by dividing the discharge capacity by the predicted current value to the voltage change prediction unit. A mode switching mask unit for suppressing an operation mode switching instruction of the operation mode switching instruction unit;
5. The voltage change predicting unit outputs a mask signal to the mode switching mask unit when the predicted voltage value is lower than a threshold voltage value in a power saving mode and higher than a threshold voltage value in a power-off mode. The portable terminal device described.   The mobile terminal device according to claim 4 or 5, wherein when the voltage value detected by the power supply state detection unit is lower than a switching threshold voltage of a power-off mode, the operation mode switching instruction unit instructs the power-off. Provided input task permission means for notifying whether or not the execution candidate task can be executed,
When the predicted voltage value is smaller than the switching threshold voltage in the power-off mode, the voltage change predicting unit outputs a prohibition notification to the submitting task permitting unit, and the operating system does not execute the execution candidate task. The mobile terminal device according to any one of claims 4 to 6, which ends in an error. Timer means for transmitting the mask signal to the mode switching mask unit for a predetermined period based on an instruction from the voltage change prediction means;
The task power consumption characteristic storage means stores a current value necessary for execution of a task and data of a period during which the current flows,
The voltage change prediction unit receives a notification of a next execution candidate task from the input task notification unit, and obtains a current value necessary for execution of the task and the current obtained by referring to the task power consumption characteristic storage unit. 8. The portable terminal device according to claim 4, wherein an instruction to transmit the mask signal only during a period in which the current flows is output to the timer unit based on a flowing period. An end task notification means for notifying the next end candidate task of the operating system;
In response to the notification from the end task notification unit, the voltage change prediction unit obtains the current value detected by the power supply state detection unit and the next end candidate task acquired by referring to the task power consumption characteristic storage unit. Output the difference between the current value that decreases when executed to the discharge capacity calculation means as the predicted current value,
The portable terminal device according to any one of claims 4 to 8, wherein the discharge capacity calculation means outputs a predicted voltage value calculated by dividing the discharge capacity by the predicted current value to the voltage change prediction means.   The portable terminal device according to claim 9, wherein the voltage change prediction unit outputs a mask signal to the mode switching mask unit when the predicted voltage value is higher than a threshold voltage value in a power saving mode.   The power consumption characteristics of the execution candidate task are stored in the power consumption characteristic storage means at the time of receiving the notification from the input task notification means, and the power consumption of the completion candidate task at the time of notification from the end task notification means The portable terminal device according to claim 4, further comprising a characteristic update unit that deletes a characteristic from the power consumption characteristic storage unit.

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