JP2000236295A - Battery voltage detecting device of radio portable device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a battery voltage detecting device of the radio portable device which prevents a system from undergoing system down, before detecting battery voltage dropping. SOLUTION: When the voltage of a battery 4 detected by a voltage detection part 5 is higher than a reference value P2, a control part 3 reads the timer time corresponding to the measured voltage out of a storage part 12 and sets it in a variable timer 6. The battery voltage is measured with a timing based upon the time measurement of the variable timer 6. Furthermore, when the voltage of the battery 4 measured by the voltage detection part 5 is less than the reference value P2 and larger than a prescribed value P1, a certain timer time is read out of the storage part 12 and set in the variable timer 6. Consequently, the battery voltage can be measured in a time corresponding to the discharged state of the battery 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless portable device of a mobile communication system, and more particularly to a battery voltage detecting device.

[0002]

2. Description of the Related Art Conventionally, in standby mode, battery voltage is detected by a long-period timer, and when voice is output, switching to a short-period timer is performed, and wireless selection with a voice notification function for detecting battery voltage is performed. A paging receiver is known (JP-A-10-42332).

[0003]

The above-mentioned radio selective call receiver with a voice notification function has a variable timer setting at the time of standby and at the time of voice output. There is an advantage that a system down due to a decrease in battery voltage can be prevented. However, in the above-described radio selective calling receiver with a voice notification function, in the standby state set by the long-period timer, the detection interval of the battery voltage is wide, so that the system may be shut down before detecting the voltage drop. there were.

The present invention has been made in view of such circumstances, and an object of the present invention is to set a variable timer according to a value determined according to the current battery voltage, thereby detecting a decrease in battery voltage. It is an object of the present invention to provide a battery voltage detection device for a wireless portable device that can prevent the system from going down.

[0005]

To achieve the above object, according to the present invention, there is provided a battery voltage detecting device for a wireless portable device for transmitting and receiving a wireless signal with a wireless base station. A battery that supplies an operating voltage to each unit of the device, and a voltage detection unit that measures an output voltage of the battery,
A variable timer for generating a timing for activating the voltage detection unit, a storage unit in which timer values respectively corresponding to the voltages of the battery are stored in advance, and a timer value corresponding to the voltage measured by the voltage detection unit And the control means for reading out the variable timer from the storage means and setting the variable timer. The battery voltage is measured at the timing indicated by the variable timer.

According to a second aspect of the present invention, in the battery voltage detecting device for a wireless portable device according to the first aspect, the control means detects that the voltage detected by the voltage detecting means is equal to or less than a predetermined reference value. In this case, a constant value is set in the variable timer.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a wireless portable device according to an embodiment of the present invention.
In this figure, reference numeral 1 denotes an antenna for receiving and transmitting a radio signal from a radio base station. A wireless unit 2 modulates or demodulates a wireless signal transmitted and received by the antenna 1. A control unit 3 controls each unit of the apparatus, which will be described later in detail. 4 is a battery. Reference numeral 5 denotes a voltage detector that measures the voltage of the battery 4, and is configured by an A / D converter. The voltage detection unit 5 measures the voltage of the battery 4 in response to the measurement instruction from the variable timer 6, and outputs the measurement result to the control unit 3. The variable timer 6 is a timer for creating the timing of battery voltage measurement, and the timer time is set by the control unit 3. Reference numeral 7 denotes a notification unit that notifies that the remaining amount of the battery 4 is smaller than a specified value. As a means for informing, there are a warning by a speaker, blinking of an LED, and the like.

Reference numeral 8 denotes a display unit, which displays a message supplied from the control unit 3, a time, a remaining battery level in a percentage display or a bar graph. A liquid crystal display device or the like is used as the display means. 9 is a power switch. Reference numeral 10 denotes a ROM (Read Only Memory) in which a program used in the control unit 3 is stored, 11 denotes a RAM (Random Access Memory) for temporarily storing data, 12
Is a storage unit (ROM) in which the timer time set in the variable timer 6 is stored in advance.

Next, the timer time stored in the storage unit 12 will be described. FIG. 3 is a diagram showing the discharge characteristics of the battery 4, in which the vertical axis represents the battery voltage and the horizontal axis represents the elapsed time (discharge time). In this figure, P2 is a reference value, which is a voltage at which the remaining amount of the battery 4 decreases and the voltage starts to decrease. P1 is a specified value and is a limit voltage value at which a normal operation of the system is guaranteed. The storage unit 12 stores a timer time Cn corresponding to each voltage equal to or higher than the reference value P2, and a fixed timer time C1 corresponding to each voltage between the reference value P2 and the specified value P1. Have been.

FIG. 4 is a diagram showing a state in which the timer time is stored. In this figure, a column R1 corresponds to the voltage of the battery 4 and a column R2 corresponds to the voltage of the battery 4 and is output from the voltage detector 5. Column R3 indicates the address of the storage unit 12 corresponding to the voltage data, and column R4 indicates the timer time Cn stored in the address of column R3. As shown in this figure, when the battery voltage is equal to or higher than the reference value P2, the storage unit 12 stores a timer time Cn that changes according to the battery voltage. In this case, a fixed timer time C1 is stored. In this case, the timer time Cn increases as the battery voltage increases. Further, the timer time C1 has a value smaller than the timer time Cn.

Next, the battery voltage detecting operation of the above-described wireless portable device will be described with reference to the flowchart of FIG. First, when the power switch 9 is turned on (step S10).
1) The control unit 3 operates the voltage detection unit 5. The voltage detector 5 measures the voltage of the battery 4 (step S10).
2) Send the measurement result to the control unit 3. The control unit 3 compares the measurement result with the specified value data P1 which is set in advance therein (step S103). When it is determined that the measurement result is equal to or smaller than the specified value data P1 (step S10).
3) A signal for instructing an alarm is sent to the notification unit 7. The notification unit 7 that has received the signal issues an alarm notifying that the battery 4 has dropped below the specified value (step S113).

When the control section 3 determines that the measurement result of the voltage detection section 5 is equal to or greater than the specified value data P1, it reads the timer time corresponding to the measurement result from the storage section 12. That is, for example, if the battery voltage is now 2.81 V and the output data of the voltage detection unit 5 is D8, the control unit 3 sets the timer time Cn “1020” of the address “801C” corresponding to D9 whose measurement result is close. Is read from the storage unit 12 (step S104). Then, the read timer time Cn “1”
020 ”is set in the variable timer 6 (step S10).
5). Thus, the variable timer 6 thereafter measures the timer time “1020” (step S10).
6).

When the measurement of the timer time “1020” is completed (step S 106), a measurement instruction is output from the variable timer 6 to the voltage detector 5. Voltage detector 5
Receives this instruction, measures the voltage of the battery 4, and outputs it to the control unit 3 (step S107). The control unit 3 checks whether or not the voltage output from the voltage detection unit 5 is smaller than the reference value P2 (step S108).
4), the variable timer 6 is set (step S105).
Hereinafter, the above operation is repeated.

Then, the voltage of the battery 4 decreases and the reference value P
When it becomes 2 or less (step S108), a fixed timer time C1 is read from the storage unit 12 and set to the variable timer 6 (step S109). When the timer time C1 has elapsed (step S110), a measurement instruction is output from the variable timer 6 to the voltage detection unit 5, and the voltage detection unit 5 detects the voltage of the battery 4 (step S1).
11). When the output voltage of the voltage detection unit 5 is supplied to the control unit 3, the control unit 3 checks whether or not the voltage is equal to or lower than a predetermined value P1 set in advance, and if not, it is not below. In this case, the timer time C1 is set in the variable timer 6 again. Thereafter, the timer time C1 is measured again by the variable timer 6 (step S110).

Next, when the voltage of the battery 4 further decreases and falls below the specified value P1 (step S112), the control section 3 sends a signal for instructing an alarm to the notification section 7. The notification unit 7 that has received the signal issues an alarm notifying that the battery 4 has dropped below the specified value (step S113).

[0016]

As described above, according to the present invention,
A variable timer that generates a timing for activating the voltage detection unit, a storage unit in which a timer value corresponding to each voltage of the battery is stored in advance, and a timer value corresponding to the voltage measured by the voltage detection unit. Control means for reading from the storage means and setting the variable timer, wherein the battery voltage is measured at a timing designated by the variable timer, so that the battery voltage is measured at a timing according to the current battery voltage. As a result, there is an effect that it is possible to prevent the system from being shut down before detecting a decrease in the battery voltage.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a wireless portable device according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating an operation of the wireless portable device.

FIG. 3 is a diagram showing a relationship between a battery voltage and a variable timer set value.

FIG. 4 is a diagram showing contents stored in a storage unit 12 in FIG. 1 in advance.

[Explanation of symbols]

 Reference Signs List 1 antenna 2 radio unit 3 control unit 4 battery 5 voltage detection unit 6 variable timer 7 notification unit 8 display unit 9 power switch 10 ROM 11 RAM 12 storage unit

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5G003 EA05 EA06 5K027 AA11 BB17 FF14 FF28 GG03 GG08 5K067 AA27 EE02 FF19 FF23 FF24 FF27 FF33 HH23 KK05 KK15 LL11

Claims (2)

[Claims] 1. A battery voltage detecting device for a wireless portable device that transmits and receives a wireless signal to and from a wireless base station, comprising: a battery for supplying an operating voltage to each unit of the wireless portable device; and an output voltage of the battery. Voltage detection means, a variable timer for generating a timing for activating the voltage detection means, storage means in which timer values corresponding to respective voltages of the battery are stored in advance, and a voltage measured by the voltage detection means Control means for reading a timer value corresponding to the variable timer from the storage means and setting the variable timer in the variable timer, wherein the battery voltage is measured at a timing designated by the variable timer. . 2. The variable timer according to claim 1, wherein the controller sets a constant value to the variable timer when the voltage detected by the voltage detector is equal to or less than a preset reference value. Battery voltage detection device for wireless portable devices.