JPH07264645A - Wireless selective call receiver - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent battery leakage due to excessive use after battery low voltage alarm. [Structure] A voltage detection circuit 15 that monitors an output voltage of a battery 22 or a booster circuit 21 to detect a predetermined low voltage, and a preset period has elapsed since the voltage detection circuit 15 detected the predetermined low voltage. Timer 11 that keeps time until
And a power consumption reduction control unit 10 for reducing the power consumption of the wireless unit 2, the demodulation unit 3 and the like when the period has elapsed, and a warning when a predetermined low voltage is detected and when a set period has elapsed. Is provided with a notification control unit 8 and a display control unit 9. The setting of the time period is performed from the input unit 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a selective call receiver having a low power consumption function.

[0002]

2. Description of the Related Art A conventional selective call receiver has one or two booster circuit outputs for boosting the battery voltage or the battery voltage.
It is monitored by two voltage detection circuits. In the case of a selective call receiver monitored by one voltage detection circuit,
When the voltage detection circuit detects a certain low voltage, the control unit issues a low voltage alarm.However, if the selective call receiver is continuously used without replacing the battery, the battery voltage Will drop further and the battery will be used until the receiver becomes inoperable.

In the case of a selective call receiver which is monitored by two voltage detection circuits, one voltage detection circuit is
Used to generate a low voltage alarm similar to the former,
The other voltage detection circuit is used to stop the operation of the receiver and the like to enter the low power consumption state when the battery voltage further decreases and a low voltage of a lower value is detected. By doing so, it is possible to prevent a sudden drop in the battery voltage thereafter and prevent leakage.

[0004]

However, in the above-mentioned conventional selective call receiver, when the voltage is monitored by one voltage detection circuit, the battery is used until the receiver becomes inoperable even after the low voltage alarm is issued. Therefore, a malfunction may occur immediately before the battery becomes inoperable, or a battery may leak if a low-quality battery is used.

Further, when the voltage is monitored by the two voltage detection circuits, the variation in the detection voltage of each voltage detection circuit causes a remarkable variation in the time from the occurrence of the low voltage alarm to the low power consumption state. Therefore, a high detection voltage accuracy is required for each voltage detection circuit, resulting in an increase in cost, and the cost increase due to the use of two voltage detection circuits.

Therefore, in the present invention, the time after the low voltage alarm is generated or the low voltage is detected is monitored, and after a certain period of time, a low power consumption state is set to prevent battery leakage, and the voltage detection circuit is It is an object of the present invention to provide a radio selective call receiver that can reduce costs by combining the two.

[0007]

In order to achieve the above object, the present invention is a voltage detecting means for monitoring a battery voltage or an output voltage of a booster circuit for boosting the battery voltage to detect a predetermined low voltage. A time measuring means for measuring the time from the time when the voltage detecting means detects a predetermined low voltage to the elapse of a predetermined period set in advance, and a control means for reducing the power consumption of the receiver when the period elapses. It is equipped with.

[0008]

Therefore, according to the present invention, the normal operation of the selective call receiver is enabled from the detection of the low voltage to the elapse of the set time period, so that the battery capacity is used to the maximum extent. It is possible to prevent the liquid leakage of the battery by reducing the battery consumption after the lapse of the time period. Also, since only one voltage detection circuit is used,
The cost can be reduced.

[0009]

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 the configuration of a selective call receiver according to an embodiment of the present invention. In FIG. 1, 1 is an antenna for receiving a radio signal, 2 is a radio section for amplifying the radio signal output from the antenna 1, 3 is a demodulation section for demodulating the radio signal into a digital signal, and 4 is its own individual call code Is an ID-ROM for storing the message, and 5 is a RAM for storing the message information included in the received signal. Reference numeral 6 is a control unit. In the control unit 6, 7 is a battery saving function unit, 8 is a notification control unit that controls a notification function, 9 is a display control unit that controls display, and 10 is a power consumption reduction of the selective call receiver. A power consumption reduction control unit for controlling, a timer, a time period setting unit, a timer control unit,
Reference numeral 14 is a voltage detection recognition storage unit. Further, 15 is a voltage detection circuit for detecting a decrease in battery voltage or boosted voltage, 16
Is a drive unit for amplifying the notification drive signal, 17 is a speaker,
Reference numeral 18 is an LED, 19 is a display unit for displaying message information, 20 is an input unit for setting a time period, 21 is a booster circuit for boosting an element that requires a voltage higher than the battery voltage,
22 is a battery.

Next, the operation of the above embodiment will be described.
Since the radio selective calling operation is the same as the conventional one, only the voltage control operation will be described here. When the output voltage of the battery 22 or the booster circuit 21 becomes equal to or lower than the specified voltage, the voltage detection circuit 15 detects it and the result is stored in the voltage detection recognition storage unit 14. This information is transmitted to the notification control unit 8 and the display control unit 9, and the drive unit 16 causes the speaker 1 to operate.
7 and the LED 18 and on the screen of the display unit 19, a first alarm is issued to urge replacement of the battery 22 because the voltage of the battery 22 has dropped. Information from the voltage detection recognition storage unit 14 is also stored in the timer control unit 13
The timer control unit 13 activates the timer 11. The timer 11 starts counting according to the value which is input from the input unit 20 in advance and set in the time period setting unit 12. When the count of the timer 11 reaches or elapses the period set in the clock period setting unit 12, the fact is notified to the power consumption reduction control unit 10. The power consumption reduction control unit 10 activates the battery saving function unit 7 to stop the operations of the wireless unit 2 and the demodulation unit 3 to perform the power consumption reduction operation, and also causes the notification control unit 8 and the display control unit 9 to operate respectively. The second time that the driver 16 is activated to cause the speaker 17 and the LED 18 to give an alarm and the display unit 19 has stopped the operation of the receiver to prevent battery leakage, and thus prompts the user to replace the battery immediately. Make the display. Further, the power consumption reduction control unit 10 controls the operations of the ID-ROM 4 and the RAM 5 and executes the power consumption reduction operation.

[0011]

As is apparent from the above embodiment, the present invention has a voltage detecting means for monitoring a battery voltage or an output voltage of a booster circuit for boosting the battery voltage to detect a predetermined low voltage, and a voltage detecting means. The detecting means includes a time measuring means for measuring the time from when the predetermined low voltage is detected to the passage of a predetermined period set in advance, and a control means for reducing the power consumption of the receiver when the period elapses. Therefore, it is possible to prevent liquid leakage due to deterioration of the battery even if the battery is used to the limit without replacing the battery immediately after a low voltage alarm using a low quality battery, or if it is left without notice. It has the effect of being able to.

Further, according to the present invention, since the transition to the power consumption reduction state after the battery voltage drop is timed, only one voltage detection circuit is required and the cost is lower than that when two voltage detection circuits are used. This has the effect of being able to bring down.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a selective call receiver according to an embodiment of the present invention.

[Explanation of symbols]

 1 Antenna 2 Radio part 3 Demodulation part 4 ID-ROM 5 RAM 6 Control part 7 Battery saving function part 8 Notification control part 9 Display control part 10 Power consumption reduction control part 11 Timer 12 Clock period setting part 13 Timer control part 14 Voltage detection Recognition memory unit 15 Voltage detection circuit 16 Driving unit 17 Speaker 18 LED 19 Display unit 20 Input unit 21 Boost circuit 22 Battery

Claims (2)

[Claims] 1. A voltage detecting means for monitoring a battery voltage or an output voltage of a booster circuit for boosting the battery voltage to detect a predetermined low voltage, and from the time when the voltage detecting means detects the predetermined low voltage. A radio selective calling receiver comprising: a clocking unit that counts until a predetermined period set in advance elapses; and a control unit that reduces power consumption of the receiver when the period elapses. 2. The radio selective calling receiver according to claim 1, further comprising means for outputting an alarm when a predetermined low voltage is detected and when a predetermined period has elapsed.