JPH0437608B2 - - Google Patents

Abstract

PURPOSE:To make a user informed of the cause of a power source voltage drop by performing annunciating operation different from normal selective calling annunciation when power consumption decreases and a source voltage drops down to a lower voltage. CONSTITUTION:A low-voltage detection part 11 generates a stable reference voltage for a battery 2 and outputs a low-voltage detection signal to a ringing generation part 8 when the battery voltage drops below the reference voltage, i.e. enters a state LV. The generation part 8 once receiving the detection signal informs the user of the low-voltage state by a signal different from a call signal. In this case, if the source voltage enters the state LV owing to a large current, the volume and frequency of a ring-back tone or ringing for the start of receiver operation right after a switch 1 is turned on and the way of disconnection, etc., are made different from normal ones to let the user know the state LV. If the source voltage is in the low-voltage state even when a large current is not consumed, complete deterioration of the power source is reported by different ringing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a selective call receiver having a power supply voltage drop alarm function.

Some currently employed selective call receivers have a function (hereinafter abbreviated as "LVA function") to notify the user of a drop in power supply voltage.
With this type of function, when the power supply voltage becomes lower than a certain reference voltage set in advance, the user is notified that the power supply voltage has decreased due to a sound other than a ring tone (for example, a continuous tone) or physical vibration. Notifying the status. A power supply voltage drop state (hereinafter abbreviated as "LV state") occurs when current consumption increases mainly due to emitting a ring tone or vibrating to notify a call. After this happens, even if you stop the ringer, since the LV status has already been detected, the LAV function will operate and emit a continuous tone or vibrate as described above.
After performing an operation to stop the LVA function, when the current consumption decreases, if it is not in the LV state, it will return to receiving operation, but if it is in the LV state, it will return to receiving operation.
LVA function works. Now that the current consumption has decreased,
Assume that you have returned from the LV state. After that, if the ringer is emitted again, it will enter the LV state, so because there is a call, the ringer → operation to stop the ringer → LVA function →
It requires two operations, such as stopping the LVA, and is cumbersome to use. To avoid this, some devices make sure that once LVA is issued, the LVA function will not operate from the second time onwards. However, this has the disadvantage that it is difficult to tell that it is in the LV state.

An object of the present invention is to provide a first voltage deterioration notification means that performs a notification operation different from that of a normal selective call notification means when the power supply voltage becomes low due to increased current consumption. Therefore, it is an object of the present invention to provide a selective call receiver that can notify a user that the cause of a drop in power supply voltage is an increase in current consumption.

Another object of the present invention is to provide a first voltage deterioration notification means that performs a notification operation different from a normal selection operation when the power supply voltage becomes a low voltage state due to a large current consumption; By comprising a normal selective call notifying means and a second voltage deterioration notifying means which performs a notifying operation different from the notifying operation of the first voltage deterioration notifying means when the voltage is in a low voltage state without being consumed. To provide a selective detection receiver capable of distinguishing and informing a user whether the cause of a drop in power supply voltage is an increase in current consumption or complete deterioration of the power supply. There is a particular thing.

Another object of the present invention is to provide a selective call receiver that emits a ring tone different from that in a non-LV state after the LV state is detected.

The present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a general example of a selective call receiver (hereinafter abbreviated as "receiver") having an LVA function, and the general operation will be explained first. Assume that the switch 1 is now closed and power is being supplied to the battery 2 and other parts. The radio waves that want to enter the antenna 3 are amplified, frequency converted, and demodulated by the radio section 4.
Enter decoder 5. The decoder 5 receives a clock from the clock oscillator 6 for synchronization, control, etc., and operates. ROM (Read Only
Memory) 7 stores in advance a call signal specific to the receiver, and outputs the stored contents to the decoder 5 in response to a control signal from the decoder 5. decoder 5
If the demodulated signal from the radio section 4 and the stored contents of the ROM 7 match, it outputs a detection pulse to the sound generating section 8 via the signal line 5a. Sound generating section 8
synthesizes a calling signal from the signal obtained from the clock oscillator 6 via the signal line 6a, and when it receives a detection pulse from the decoder 5, drives the speaker 9,
Make the ringer sound. The switch 10 is a push button switch and closes only while being pressed. When the user hears the ringing tone, he presses the switch 10. The sound generating section 8 stops sounding when the switch 10 is pressed. In this way, the selective calling operation is performed.

The outage voltage detection unit 11 creates a reference voltage that stabilizes the voltage of the battery 2, and the battery voltage becomes lower than the voltage set in advance based on the reference voltage (LV state).
Then, a low voltage detection signal is output to the sound generating section 8.
Upon receiving this low voltage detection signal, the sound generating section 8 generates a low voltage alarm sound to inform the user of the low voltage state. For example, if the ringer enters the LV state due to an increase in current consumption due to the ringer, in the conventional case, after the user stops the ringer using the switch 10, a low voltage alarm is issued and the switch 10 is turned off again. to stop the alarm sound.

FIG. 2 shows an embodiment of the present invention, in which the broken line 8 shows the inside of the sound generating section 8 shown in FIG. 1, and the broken line 11 shows the inside of the low voltage detection section 11 shown in FIG. , switch 1, battery 2, speaker 9, and switch 10 are the same as in FIG. However, the power supply line is omitted.

In the low voltage detection section 11, the power supply stabilization circuit 1
01 takes the output of the battery 2 as an input, and outputs a constant voltage over a wide range of changes in the voltage of the battery 2. The comparator 102 compares the output voltage of the power supply stabilizing circuit 101 and the divided voltage of the battery 2 by the resistor 103 and the resistor 104, and when the divided voltage becomes lower than the output of the power supply stabilizing circuit 101, it becomes logic H (i.e.
In the opposite case, it outputs logic L (ie, LOW). As described above, the output of the power supply stabilizing circuit 101 is a constant voltage, and the divided voltage is proportional to the voltage of the battery 2, so that a drop in the power supply voltage can be determined by the logic of the output of the comparator 102.

The operation of this embodiment will be explained below with reference to FIG.

First, assuming that the voltage of battery 2 is sufficiently high,
Explain how the receiver generates a ring tone.

Assume that switch 1 is turned on from OFF at time to. Since the battery voltage is sufficiently high as described above, the output a of the comparator 102 is LOW (see FIG. 3a). Further, a pulse is generated at point b by a differentiating circuit having a capacitor 105 and a resistor 106 as shown in FIG. 3b. This pulse is
RS flip-flops 107, 108, 109 through OR gates 125 and 126 or directly
given to. As a result, the logic levels c, d, and e of the terminals Q of the RS flip-flops 107, 108, and 109 become LOW, HIGH, and LOW, respectively (see FIG. 3, c, d, and e).

AND gates 110-113 include a set of outputs of RS flip-flops 107-109 and a frequency divider 12.
7 pairs are connected. Frequency divider 127 divides the frequency of the clock signal obtained from clock oscillator 6 via signal line 6a, and supplies various frequency-divided signals to AND gates 110-113. Since the logic at points c, d, and e is now LOW, HIGH, and LOW, respectively, AND gates 110, 111, and 112
gates are closed and their outputs are all
It is LOW. On the other hand, since the signals from the RS flip-flops 108 and 109 are both HIGH, the AND gate 113 receives (f) from the frequency divider 127.
The sound signal synthesized by the signal at point (g) is (h)
output to the point. For example, the signal from the clock oscillator 6 is frequency-divided, 2kHz at point (f) and 5Hz at point (g).
Assume that a signal of (see f and g in Fig. 3) is output. Since the AND gate 113 is opened from the RS flip-flops 108 and 109, when both the signals at points (f) and (g) are HIGH, the output becomes HIGH, and when one of them is LOW, the output becomes LOW, so (h) As shown in Fig. 3h, a 2kHz signal is output to the point for 100ms, and then an intermittent 2kHz signal called LOW is output for 100ms. This signal is passed to AND gate 110
112 and the AND gate 121 are closed, the waveform appears as it is at the output of the OR gate 114 and enters the speaker drive circuit composed of the resistor 115 and the transistor 116. The logic of point (e) is
Since it is LOW, resistor 117 and transistor 1
18 is in an ON state, and resistor 119 is short-circuited between the collector and emitter of transistor 118. Therefore, the speaker 9 generates a 2kHz intermittent signal at a high volume.
The user knows that the receiver is ready for operation.

When the user presses the switch 10 at time _t1 to stop the sound, point (i), which had been pulled down by the resistor 120 and was LOW, becomes HIGH (see Figure 3 i), and the RS flip-flop The Q output of 108 changes from HIGH to LOW. At this time,
RS flip-flops 107 and 109 remain unchanged. Therefore, the AND gate 113 closes, and the sound to notify that the receiver is ready for operation stops.

Next, suppose that a detection pulse is input from the decoder 5 to point (j) via the signal line 5a at time _t2 due to a selective call (FIG. 3j). At this time,
Point (c) of RS flip-flop 107 is from LOW
Changes to HIGH. (Figure 3c). Therefore, AND
Gate 124 is closed AND gates 112 and 11
3 opens. Also, since point (e) is LOW, AND
Gate 111 is also closed, and only AND gate 110 is open. Therefore, as in the case of the AND gate 113 described above, the points (f') and (g') from the frequency divider 127
Depending on the waveform of the point, an intermittent signal with a frequency different from that of the AND gate 113 is output from the AND gate 110, and the speaker 9 makes a loud sound. In this way, the user can be notified of the call.

When the user presses the switch 10 at time _t3 to stop the sound, the RS flip-flop 107
The Q output changes from HIGH to LOW, the AND gate 110 closes, and the ringing to notify the call stops.

Next, a case where the battery 2 has deteriorated will be explained.

As described above, let us assume that there is a ringing sound due to the switch 1 being closed or due to a call. At this time,
Since the transistor 118 is in the ON state, a large current flows through the speaker 9. Since the battery 2 has deteriorated, this current causes the voltage of the battery 2 to drop and the output of the comparator 102 changes from LOW to HIGH. It becomes HIGH through AND gate 123, and RS flip-flop 109 is set. Therefore, AND gates 110 and 113 are closed. Further, since the point (e) is HIGH, the transistor 118 is turned off, and the resistor 119 is connected in series to the speaker 9. Now, if it is a ringing for a call, the gate 111 is opened and the point (f'') is reached.
An intermittent signal is output according to the waveform at point (g″).
If the sound is for turning on the switch 1, the gate 112 opens and an intermittent signal is output according to the waveforms at points (f) and (g). At this time, since the resistor 119 is connected in series to the speaker 9, the current becomes small. If the battery 2 has not deteriorated much, the current becomes small, so the voltage of the battery 2 increases, and the output of the comparator 102 returns from HIGH to LOW. However, since the Q output of the RS flip-flop 109 remains HIGH, the intermittent tones of (f'') and (g'') or (f) and (g) continue to be sounded in a weak tone. When the user presses switch 10 to stop this sound, the RS
Flip-flops 107, 108, 109 are reset and the sound stops.

If the sound stops and the voltage of the battery 2 is equal to or higher than the specified voltage with no current flowing through the speaker 9, normal reception operation is resumed. On the contrary, battery 2
If the voltage of comparator 1 is lower than the specified voltage,
Since the output of 02 is HIGH, AND gate 1
21 is opened and the waveform at point (k) of frequency divider 114 is ANDed.
This appears in the output of the gate 121, and a continuous sound is generated in the speaker 9, thereby informing the user that the battery 2 has significantly deteriorated.

As described above, according to this embodiment, when the power supply voltage becomes low voltage state due to a large current, the volume, frequency, intermittent method, etc. of the ring tone or the sound of the receiver operation start immediately after the switch is turned on are adjusted. By making it different from the normal state, it is possible to notify the user of the deterioration of the power supply.
This eliminates the need for troublesome operations for users, and even when not consuming large currents, if the voltage is low, other sounds (such as continuous sounds) can be used to notify complete deterioration of the power supply. A selective call receiver with a low voltage alarm function can be provided.

As explained above, in the present invention, when the low voltage detection section outputs a detection signal while the selective call notifying means is operating, the previous notifying operation by the selective call notifying means is stopped, and instead, the Since it is equipped with voltage deterioration notification means that performs a different notification operation from the notification means by the selective call notification means, switching from notification of selective call to notification of voltage drop is possible.
This is done automatically without manual operation, which has the effect of reducing troublesomeness. Furthermore, according to the present invention,
By providing a first voltage deterioration notification means that performs a notification operation different from a normal selective call notification operation when the power supply voltage becomes a low voltage state due to an increase in current consumption, a drop in the power supply voltage can be prevented. A selective call receiver can be obtained that can notify the user that the cause of the problem is increased current consumption.

Further, according to the present invention, the first voltage deterioration notification means performs a notification operation different from a normal selective call notification operation when the power supply voltage becomes a low voltage state due to large current consumption; and a second voltage deterioration notifying means that performs a normal selective call notifying operation and a notifying operation different from the notifying operation of the first voltage deterioration notifying means when the voltage is in a low voltage state without consuming the voltage. Therefore, it is possible to provide a selective call receiver that can distinguish and inform the user whether the cause of the drop in power supply voltage is increased current consumption or complete deterioration of the power supply. It will be done.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing a general example of a selective call receiver having a low voltage alarm function, Fig. 2 is a circuit diagram showing an embodiment of the present invention, and Figs. FIG. 3 is a waveform diagram when the power switch is turned on at points a to j in FIG. 1... Switch, 2... Battery, 3... Antenna, 4... Radio section, 5... Decoder, 6... Clock oscillator, 7... ROM (Read Only
Memory), 8...Sound generation section, 9...Speaker,
10...Switch, 11...Low voltage detection section, 10
1... Power supply stabilization circuit, 102... Comparator, 103, 104... Resistor, 105... Capacitor, 106... Resistor, 107, 108, 109
...RS flip-flop, 110, 111, 1
12, 113...AND gate, 114...OR gate, 115...Resistor, 116...Transistor, 117...Resistor, 118...Transistor,
119, 120... Resistor, 121... AND gate, 122... Inverter, 123, 124...
AND gate, 125,126...OR gate, 1
27... Frequency divider.

Claims (1)

[Scope of Claims] 1. A low voltage detection unit that detects deterioration of the power supply voltage and outputs a detection signal, selective call notification means that reports selective call, and power supply voltage determined by the operating current when the selective call notification means operates. when the low voltage detection unit outputs a detection signal due to a voltage drop of A selective call receiver comprising: 2. A low voltage detection unit that detects deterioration of the power supply voltage and outputs a detection signal, a selective call notification unit that notifies a selective call, and an operation start notification unit that notifies that the receiver has started operating when the power is turned on; When the low voltage detection section outputs a detection signal due to a voltage drop in the power supply voltage due to the operating current of the selective call notifying means or the operation start notifying means, the selective call notifying means or the operation start notifying means makes a notification. 2. A selective call receiver comprising voltage deterioration notification means for performing a notification operation different from the notification operation by the selective call notification means and the operation start notification means, instead of the operation. 3. A low voltage detection section that detects deterioration of the power supply voltage and outputs a detection signal, a selective call notification means that reports selective call, and a voltage drop in the power supply voltage caused by an operating current when the selective call notification means operates. a first voltage deterioration notification means for performing a notification operation different from the notification operation by the selective call notification unit, instead of the notification operation by the selective call notification unit, when the voltage detection section outputs a detection signal; a second voltage deterioration that performs a notification operation different from the notification operation by the selective call notification means and the first voltage deterioration notification means when the low voltage detection section outputs a detection signal when the notification means is not operating; 1. A selective call receiver comprising a notification means. 4. A low voltage detection unit that detects deterioration of the power supply voltage and outputs a detection signal, a selective call notification unit that notifies a selective call, and an operation start notification unit that notifies that the receiver has started operating when the power is turned on; When the low voltage detection section outputs a detection signal due to a voltage drop in the power supply voltage due to the operating current of the selective call notifying means or the operation start notifying means, the selective call notifying means or the operation start notifying means makes a notification. a first voltage deterioration notification means that performs a notification operation different from the notification operation by the selective call notification unit and the operation start notification unit, instead of the operation, the selective call notification unit, the operation start notification unit, and the first When the low voltage detecting section outputs a detection signal when none of the voltage deterioration notifying means is operating, the selective call notifying means, the operation start notifying means, and the first voltage deterioration notifying means perform notification operations. and a second voltage deterioration notification means that performs a different notification operation.