JPH098726A - Radio call receiver and control method for same - Google Patents

Abstract

PURPOSE: To prevent the output of a low voltage alarm caused by the temporary drop of a voltage, to exactly output the low voltage alarm and to improve convenience. CONSTITUTION: When a vibrator is operated, a detection cycle generating part 3 outputs pulse signals in a fixed cycle to a fluctuation detecting part 6 and according to the timing of pulses from the detection cycle generating part 3, the fluctuation detecting part 6 reads two voltage values of an air battery 4 and calculates the inclination of voltage drop between two values. When the calculated inclination is smaller than a reference value set in advance, a low voltage detection pulse is outputted to a control part 2 so that the low voltage alarm can be outputted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio call receiver and, more particularly, to a radio call receiver capable of accurately issuing a low-voltage alarm indicating battery voltage drop and improving convenience. Regarding control method.

[0002]

2. Description of the Related Art A radio call receiver uses a battery called an air battery as a power source. When the voltage of the battery drops, a low voltage alarm is issued to prompt the user to replace the battery. Has become.

In a conventional radio paging receiver, a constant voltage value is set as a threshold value in advance, and the voltage of the air battery (power supply voltage) is checked at any time, and the power supply voltage is lower than the threshold value. In this case, a low voltage alarm is output and the reception function is stopped.

Here, as a characteristic of the air battery, in addition to a voltage drop due to a decrease in electromotive force, when a function that requires a large current, such as a vibrator, is operated, the voltage temporarily changes due to the internal resistance of the battery. It may decrease and fall below the threshold value.

In order to prevent the low voltage alarm from being output due to the temporary voltage drop as described above, the conventional radio paging receiver detects the low voltage after the consumption of a large current in the waiting state of the paging. Even so, I try not to give an alarm. However, immediately after the power is turned on, it is not taken into consideration whether or not it has been consumed by a large current, so that the low voltage alarm is immediately output when the power supply voltage is equal to or lower than the threshold value.

For example, when the operation is performed in the order of power ON → vibrator operation → power OFF → power ON → ..., the low voltage alarm sounds after only a few operations. Change in voltage of air battery and conventional low voltage alarm in this case Fig. 3
This will be described with reference to FIG. FIG. 3 is an explanatory diagram showing a relationship between a change in power supply voltage and a conventional low voltage alarm. As shown in Fig. 3, turn on the radio paging receiver using a new air battery.
-> Vibrator operation-> Power OFF-> Power ON-> The change in the voltage of the air battery when operated continuously, the voltage of the air battery temporarily drops when the power is turned on, and once it recovers, it consumes a large current. The voltage drops remarkably during operation, and when the power is turned off, the voltage gradually rises.

In the example of FIG. 3, the threshold value is set to 1.1V, but the power supply voltage is 1.1V immediately after the fourth power-on.
When the voltage drops below V, the radio paging receiver issues a low voltage alarm,
The reception function of the radio paging receiver is stopped for 3 minutes. In fact, at this point, the electromotive force of the air battery has not yet fallen, and it should normally be able to perform a sufficient reception function.

However, since the low voltage alarm is intended to prompt the user to replace the battery, a voltage value slightly higher than the voltage at which the radio paging receiver can normally operate is set as the threshold value. Therefore, even if the low voltage alarm sounds once, if the user resets, the normal reception operation can be performed for a while.

[0009]

However, in the conventional radio paging receiver and the control method therefor, since the low voltage alarm is issued based on the instantaneous value of the power supply voltage, even if the power supply voltage is temporarily lowered, it is prompt. There is a problem that a low voltage alarm is issued and the reception function is stopped, and the user must reset each time, which is inconvenient.

The present invention has been made in view of the above circumstances, and it is possible to prevent the low voltage alarm from being output due to a temporary voltage drop and to accurately output the low voltage alarm to improve the convenience. An object is to provide a call receiver and a control method thereof.

[0011]

According to a first aspect of the present invention for solving the problems of the conventional example, a radio paging receiver having a vibrator outputs a pulse signal having a constant cycle when the vibrator operates. A detection cycle generator and a reference value for power supply voltage change are provided, the power supply voltage value is read at the timing of the pulse signal from the detection cycle generator, and the slope of the voltage change is calculated from the two read voltage values. It is characterized in that it has a fluctuation detection unit that detects a low voltage when the slope is equal to or less than the reference value, and a control unit that outputs a low voltage alarm when the fluctuation detection unit detects a low voltage.

According to a second aspect of the present invention for solving the above-mentioned problems of the conventional example, in the method of controlling a radio paging receiver according to the first aspect, the detection period generating section has a pulse of a constant period during operation of the vibrator. The signal is sent to the fluctuation detection unit, and the fluctuation detection unit reads a binary power supply voltage value according to the timing of the pulse signal from the detection cycle generation unit, and 2
The slope of the voltage change between the values is calculated, the calculated slope is compared with a preset reference value, and when the calculated value is less than or equal to the reference value, a low voltage detection pulse is output to the control unit, and The control unit issues a low voltage alarm when the low voltage detection pulse is received.

[0013]

According to the present invention, the fluctuation detecting section reads the binary power supply voltage value according to the timing of the pulse signal of the constant cycle output from the detection cycle generating section during the vibrator operation, The slope of the change is calculated, and if it is less than the reference value, a low voltage detection pulse is output, and the control unit
Since the radio paging receiver and its control method generate a low voltage alarm when it receives the low voltage pulse, it is possible to output an accurate low voltage alarm based on the slope of the voltage drop. There is an effect that the output of an unnecessary low voltage alarm can be prevented and the convenience can be improved.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. A radio paging receiver and a control method therefor according to an embodiment of the present invention provide a power supply voltage of 2 when a vibrator is operating.
By measuring the value, calculating the slope of the voltage change during that time, and outputting a low voltage alarm based on the slope of the voltage drop,
The low voltage alarm is not output when the voltage drops momentarily.

A radio paging receiver according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a configuration block diagram of a radio paging receiver according to an embodiment of the present invention. FIG.
As shown in FIG. 2, the radio paging receiver of the present embodiment includes a driver 1 including a vibrator, a speaker, etc., a control unit 2 that controls the driver 1, and a detection cycle generation unit 3 that specifies the timing of sampling the power supply voltage. , A / D (analog / analog / voltage) from the air battery 4 as a power source
It is composed of an AD converter 5 that performs digital) conversion, and a fluctuation detection unit 6 that reads a binary voltage value from the AD converter 5 and detects a slope between the two values. Further, the control unit 2 is provided with a RAM 21 that stores a low voltage flag.

Before explaining each component, a low voltage detecting method in the radio paging receiver of this embodiment will be briefly described with reference to FIG. As can be seen from the example shown in FIG. 3, when the electromotive force of the power source decreases as the battery continues to be used, the average voltage gradually decreases, but when the vibrator that consumes a large current operates, the slope of the voltage drop is growing. For example, comparing the vibrator operation immediately after the power is turned on (A) with the vibrator operation immediately before the low voltage alarm is generated (B), it can be seen that the slope of the voltage drop is larger in B. In this embodiment, this is utilized to detect the voltage drop of the air battery.

Next, each component of the radio paging receiver of this embodiment will be described in detail. The driver 1 is the same part as a conventional one, and receives a command signal from the control part 2 to vibrate, a speaker, and an LCD (Liquid Crystal Displ).
ay) and so on.

Further, when driving the vibrator or the like, the control unit 2 outputs a signal for instructing the driving of the vibrator to the driver 1. The characteristic of the present embodiment is that the detection period generating unit 3 is simultaneously operated. However, the same signal is output. That is, it shows the operation of the vibrator that consumes a large current to the detection cycle generator 3.

The detection cycle generator 3 outputs a pulse signal of a constant cycle to the fluctuation detector 6 only when the vibrator is operating, in accordance with a signal from the controller 2. This pulse signal designates the timing when the voltage value is read in the fluctuation detector 6.

Further, the AD converter 5 is for A / D converting the voltage from the air battery 4 as needed and outputting it to the fluctuation detecting section 6.

The fluctuation detecting section 6 has a reference value (ds) of the slope of the voltage drop during the operation of the vibrator as a reference for detecting the low voltage of the air battery 4, and is designated by the detection cycle generating section 3. The voltage value input from the AD converter 5 is read at different timings, the slope of the voltage drop is calculated from the read voltage value, and when a low voltage is detected, a low voltage detection pulse is sent to the control unit 2. is there.

Specifically, the fluctuation detecting section 6 reads the binary voltage value from the A / D converter 5 in accordance with the timing of the pulse from the detection cycle generating section 3 and determines the slope of the voltage drop between these two values. When the calculated slope is less than or equal to the set reference value (ds), that is, when the negative slope is large, a low voltage detection pulse is sent to the control unit 2. In this embodiment, the reference value (ds) is set to -0.15V / sec.

Here, a method of calculating the slope of the voltage drop in the fluctuation detecting section 6 will be described. When the pulse period from the detection period generator 3 is p and the voltage values read at the pulse timing are Va and Vb in the reading order, the slope d of the voltage drop should be calculated by d = (Vb-Va) / p. You can

Thus, the low voltage of the air battery 4 can be detected based on the slope of the voltage drop of the power supply voltage during the operation of the vibrator, and the conventional method of outputting the low voltage alarm based on the instantaneous voltage value. Compared with the above, it is possible to prevent the output of an unnecessary low voltage alarm and output a more accurate low voltage alarm.

When the control unit 2 receives the low voltage detection pulse from the fluctuation detection unit 6, the control unit 2 sets a low voltage flag in the RAM 21 and outputs a low voltage alarm. That is, the driver 1 is instructed to stop the vibrator, and
This is to instruct the display unit to display a caution message and stop the reception function. After the low voltage alarm is output, the low voltage flag of the RAM 21 is reset and the normal operation is resumed when a predetermined time has elapsed.

Next, the operation of the radio paging receiver of this embodiment will be described with reference to FIGS. FIG.
It is a timing chart figure which shows the operation | movement and control method of the radio call receiver of a present Example, (a) is a state diagram which shows the operation state of a radio call receiver, (b) is the air battery 4.
4C is a graph showing a change in the voltage of FIG. 4, FIG. 6C is an explanatory diagram showing a signal waveform output from the control unit 2 to the detection cycle generating unit 3, and FIG. It is explanatory drawing which shows the signal waveform output to the part 6, (e) is explanatory drawing which shows the low voltage detection pulse which the fluctuation detection part 6 outputs, (f) is explanatory drawing which shows the state of RAM21. is there.

Here, as shown in FIG.
The same operation as the operation shown in (1), that is, power ON → vibrator operation → power OFF → power ON → ... The initial ringing sound is an operation that is always performed after the power is turned on, and has a function of notifying the user that the radio paging receiver has properly started up.

The change in voltage of the air battery 4 when the above operation is performed is as shown in FIG. 2B, and this waveform is input to the AD converter 5 at any time.

Here, the control unit 2 outputs to the detection period generating unit 3 a signal which becomes "L" when the vibrator is not operating and "H" when the vibrator is operating (FIG. 2).
(C)).

Further, when the detection period generating section 3 receives the signal shown in (c) from the control section 2, it outputs a pulse signal of a constant period only during the period when the received signal is "H" (Fig. 2 (d)).

Then, when the fluctuation detecting section 6 receives the pulse signal shown in FIG.
The voltage of the air battery input from the D converter 5 is read, and the slope of the voltage drop is calculated from the read binary voltage value.

In the example of FIG. 2, first, at the time of the first vibrator operation, the voltage values V1 and V2 are read and the slope d1 (d1 = -0.1V / sec) of the voltage drop is calculated. In this embodiment, the reference value (ds) set in the fluctuation detecting unit 6 is-.
Since it is 0.15 V / sec and d1> ds, the low voltage is not detected here.

During the next vibrator operation, the voltage value V3,
V4 is read and the slope d2 (d2 = -0.2 V / sec) is calculated. In this case, since d2 <ds, the low voltage detection pulse is output to the control unit 2 (see FIG. 2 (e)).

When the control unit 2 receives the low voltage detection pulse, it sets a low voltage flag in the RAM 21, stops the operation of the vibrator, and displays a caution message (FIG. 2).
(A)). Then, after a certain period of time, the low voltage flag is reset.

When the control unit 2 sets the low voltage flag,
The state of the area for storing the flag of the RAM 21 becomes "H", and when the control unit 2 resets the flag after a fixed time, the state of the RAM 21 becomes "L" (see FIG. 2 (f)). After resetting the flag, the radio paging receiver will
It is designed to return to normal operation. In this way, the control method of the radio paging receiver of the present embodiment is performed.

According to the radio paging receiver and its control method of the present embodiment, the detection cycle generator 3 outputs a pulse signal of a constant cycle to the fluctuation detector 6 when the vibrator operates, and the fluctuation detector 6 detects the pulse signal. When the voltage value of the air battery 4 is read in binary according to the timing of the pulse from the cycle generator 3, the slope of the voltage drop between the two values is calculated, and when the calculated slope is less than or equal to a preset reference value, Since the low-voltage detection pulse is output to the control unit 2, an accurate low-voltage alarm can be output based on the slope of the voltage drop during the operation of the vibrator that consumes a large current, and the instantaneous voltage There is an effect that it is possible to prevent the output of an unnecessary low voltage alarm due to a decrease and improve convenience.

[0037]

According to the first and second aspects of the present invention, the fluctuation detecting section is configured to operate in accordance with the timing of the pulse signal of a constant cycle output from the detecting cycle generating section during operation of the vibrator.
A radio call that reads a binary power supply voltage value, calculates the slope of the voltage change, outputs a low voltage detection pulse if it is below a reference value, and issues a low voltage alarm when the control unit receives the low voltage pulse. Since the receiver and its control method are used, it is possible to output an accurate low-voltage alarm based on the slope of the voltage drop, prevent the output of an unnecessary low-voltage alarm due to a momentary voltage drop, and improve convenience. There is an effect that can be.

[Brief description of drawings]

FIG. 1 is a configuration block diagram of a radio paging receiver according to an embodiment of the present invention.

2A is a state diagram showing an operating state of the radio paging receiver, FIG. 2B is a graph diagram showing a change in voltage of the air battery 4, and FIG. 2C is a control diagram. It is explanatory drawing which shows the signal waveform which the part 2 outputs to the detection period generation part 3, (d).
FIG. 4A is an explanatory diagram showing a signal waveform output from the detection cycle generating unit 3 to the fluctuation detecting unit 6, FIG. 6E is an explanatory diagram showing a low voltage detection pulse output from the fluctuation detecting unit 6, and FIG. Is
It is explanatory drawing which shows the state of RAM21.

FIG. 3 is an explanatory diagram showing a relationship between a change in power supply voltage and a conventional low voltage alarm.

[Explanation of symbols]

1 ... driver, 2 ... control unit, 3 ... detection period generating unit,
4 ... Air battery, 5 ... AD converter, 6 ... Fluctuation detection unit, 21 ... RAM

Claims (2)

[Claims] 1. A radio paging receiver having a vibrator, comprising: a detection cycle generator that outputs a pulse signal of a constant cycle when the vibrator operates; and a pulse from the detection cycle generator, which includes a reference value of a power supply voltage change. A power supply voltage value is read at a signal timing, a slope of voltage change is calculated from the two read voltage values, and a low voltage detection unit detects a low voltage when the calculated slope is equal to or less than the reference value.
A radio paging receiver, comprising: a control unit that outputs a low voltage alarm when the fluctuation detection unit detects a low voltage. 2. The detection cycle generating section sends a pulse signal of a constant cycle to the fluctuation detecting section during operation of the vibrator, and the fluctuation detecting section uses a binary power source according to the timing of the pulse signal from the detection cycle generating section. The voltage value is read, the slope of the voltage change between the two values is calculated, the calculated slope is compared with a preset reference value, and when the calculated value is less than or equal to the reference value, the control unit detects a low voltage. 2. The method for controlling a radio paging receiver according to claim 1, wherein a pulse is output, and the control unit issues a low voltage alarm when the low voltage detection pulse is received.