JPH0792245A - Apparatus for informing of remaining amount of battery - Google Patents

Abstract

PURPOSE:To surely inform a user that the remaining capacity of a battery is small, by notifying the user of that also after the battery is stopped to be used. CONSTITUTION:When a switch 2 is turned on, a high level signal is output from an output terminal 5b of an off delay timer 5. When a voltage of a battery falls and becomes a reference voltage or lower, a high level signal is outputted from an output terminal 4b of a voltage-detecting circuit 4. In consequence, a low level signal is output from a gate circuit 6 and an LED 7 is turned on. When the switch 2 is turned off, the level of the output signal from the output terminal 5b of the off delay timer 5 is changed from high to low a predetermined time later, thereby, the output signal of the output terminal of the gate circuit 6 is switched from low to high in level, thus turning off the LED 7. In this manner, the LED 7 is continuously kept ON for the predetermined time even after the device is stopped to be used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery application device that uses a primary battery or a secondary battery, and detects and displays a decrease in battery voltage due to a decrease in the remaining capacity of the battery to replace or replace the battery. The present invention relates to a battery remaining capacity notification device that prompts charging.

[0002]

2. Description of the Related Art A battery application device to which a conventional battery remaining capacity notification device is applied detects a voltage of a battery 101 by a voltage detection circuit 104 as shown in FIGS. By comparing with a preset reference voltage Vth, when the battery voltage becomes equal to or lower than the reference voltage Vth, a low level signal is output to turn on the LED 105 and display that the battery voltage has dropped. The display circuit 106 including the voltage detection circuit 104 and the LED 105 is
If it is directly connected to the battery 101 without passing through the power switch 102, the battery 101 will be further consumed due to the power consumption of the LED 105 that lights up as the battery voltage drops. Therefore, as shown in FIG.
Is connected in parallel with the load 103 so that it operates only when the power switch 102 is turned on and the device is in use. In this way, when the power switch 102 is turned off, the LED 105 is also turned off at the same time.

[0003]

However, when the above-mentioned conventional battery remaining capacity notification device is applied to a battery application device such as an electric razor, an electric toothbrush or a handset of a cordless telephone, it is considered that the LED 105 is turned on during use. Also,
Considering the usage of these applied devices, it is difficult to see the lighting directly, so there is the problem that the decrease in battery voltage, that is, the decrease in remaining capacity, is not noticed, and the notification function is fully utilized. There wasn't.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an object of the present invention is to provide a battery remaining capacity notifying device for surely notifying the user that the remaining capacity of the battery has decreased.

[0005]

In order to achieve the above object, the present invention provides a battery applied device having a power switch which is interposed between a battery and a load and which turns on and off the operation of the device. And a voltage detection unit that outputs a detection signal when the detected battery voltage is equal to or lower than a preset reference voltage; and a notification signal that is output when the detection signal is output when the power switch is on. At the same time, after the power switch is switched from ON to OFF, a control unit that holds the output of the notification signal until a predetermined time elapses, and a notification unit that operates by receiving the notification signal (Claim 1).

The control means holds the output of the detection signal when the power switch is switched from on to off, and the control signal when the power switch is on to output the control signal. After the switch is switched from on to off, the control signal output means continues to output the control signal until a predetermined time elapses, and the notification signal, both the detection signal and the control signal are output. The output is made during the operation (Claim 2).

Further, the control means has reference voltage level switching means for changing the reference voltage to a higher level when the power switch is off, and outputs a control signal when the power switch is on. Then, after the power switch is switched from on to off, the control signal is continuously output until a predetermined time elapses, and the notification signal, both the detection signal and the control signal are output. The output is made during the period (Claim 3).

Further, in the battery remaining capacity notifying apparatus according to claim 1, there is provided a switch which is interposed between the voltage detecting means and the control means and which is turned on and off in association with turning on and off of the power switch. The control means outputs the notification signal when the detection signal is input from the voltage detection means, and holds the output of the notification signal until a predetermined time elapses after the switch is turned off. (Claim 4).

Further, in the battery remaining capacity notifying apparatus according to claim 1, a voltage dividing circuit for dividing the voltage of the battery, and a switch for guiding the divided voltage to the voltage detecting means when the power switch is turned on. The voltage detection means is configured to compare the divided voltage with a reference voltage preset as a battery voltage when the power switch is turned on, and the control means outputs the detection signal. The delay circuit outputs the notification signal and holds the output of the notification signal until a predetermined time elapses after the output of the detection signal is stopped (claim 5).

The delay circuit outputs the notification signal in synchronization with the output of the detection signal (claim 6).

Further, in a battery application device having a power switch which is interposed between a battery and a load and turns on and off the operation of the device, the battery voltage is detected, and the detected battery voltage is a preset reference voltage. The voltage detection means that outputs a detection signal at the following times, the notification means that operates upon receiving the detection signal, the control signal that is output when the power switch is turned on, and the power switch that is turned on are turned off. After that, a control means for holding the output of the control signal until a predetermined time has elapsed, and a switching means for enabling the voltage detection means and the notification means only while the control signal is being output are provided. It is a structure (Claim 7).

Further, the voltage detecting means sets, as the reference voltage, a first reference voltage for detecting a decrease in battery voltage for outputting the detection signal after the power switch is turned on, and the battery is set to the first reference voltage. It has a reference voltage switching means for switching to a second reference voltage (> first reference voltage) after detection of a voltage drop, and the second reference voltage is higher than the first reference voltage when the power switch is turned off. The battery voltage is set to be equal to or higher than the level at which the battery voltage self-recovers before the predetermined time elapses (claim 8).

Further, the control means does not accept the detection signal from the voltage detection means for a predetermined activation time after the power switch is turned on (claim 9).

The control means includes a capacitor that starts charging when the power switch is turned on and starts discharging when the power switch is turned off, and outputs a signal when the output voltage of the capacitor is equal to or higher than a predetermined level.
The detection signal is received during the output period of this signal (claim 10).

Further, the reference voltage switching means cancels the setting of the second reference voltage when the predetermined time has elapsed (claim 11).

The reference voltage switching means holds the setting of the second reference voltage until the battery voltage exceeds the second reference voltage (claim 12).

Further, in the battery remaining capacity notifying device according to any one of claims 1 to 7, the detection signal is output only for a time period corresponding to a period in which the battery voltage has dropped to a reference voltage or less to perform notification. (Claim 1
3).

[0018]

According to the first aspect of the present invention, when the battery voltage detected during the operation of the device becomes equal to or lower than the preset reference voltage, a notification signal is output, and the output of the notification signal indicates the operation of the device. It continues until a predetermined time elapses from the stop.
Then, the notification means operates in response to the notification signal.

According to the second aspect of the present invention, the control signal is output during the operation of the device and until a predetermined time elapses after the operation is stopped. On the other hand, when the battery voltage detected during the operation of the device becomes equal to or lower than the preset reference voltage, a detection signal is output, and the output of this detection signal is held when the operation of the device is stopped. Then, the notification signal is output while both the detection signal and the control signal are output, and the notification means operates upon receiving the notification signal.

According to the third aspect of the present invention, the control signal is output during the operation of the device and until a predetermined time elapses after the operation is stopped. On the other hand, when the battery voltage detected during the operation of the device becomes equal to or lower than the preset reference voltage, the detection signal is output, and when the operation of the device is stopped, the reference voltage level becomes high. Then, the notification signal is output while both the detection signal and the control signal are output, and the notification means operates upon receiving the notification signal.

According to the invention of claim 4, when the battery voltage detected during the operation of the device becomes equal to or lower than a preset reference voltage, the detection signal is input to the control means and the notification signal is output. It When the operation of the device is stopped, the switch is turned off, the output of the notification signal is held until a predetermined time elapses after the switch is turned off, and the notification means operates in response to the notification signal.

According to the invention of claim 5, the divided battery voltage is detected during the operation of the device, and when the divided voltage becomes equal to or lower than a preset reference voltage, a detection signal is output. , The notification signal is output. When the device stops working, the switch is turned off, the battery voltage is detected,
If the battery voltage exceeds the reference voltage, the output of the detection signal is stopped. Then, the output of the notification signal is held until a predetermined time elapses after the output of the detection signal is stopped, and the notification means operates in response to the notification signal.

According to the sixth aspect of the invention, when the voltage detected during the operation of the device becomes equal to or lower than the preset reference voltage, the detection signal is output, and in synchronization with the output of the detection signal. A notification signal is output, and the notification means operates in response to the notification signal.

According to the seventh aspect of the invention, the control signal is output during the operation of the device, and this output is held until a predetermined time elapses after the operation of the device is stopped. Only while the control signal is being output, the voltage detection means and the notification means are operable. Then, when the detected battery voltage becomes equal to or lower than a preset reference voltage, a detection signal is output, and the notification means operates in response to the detection signal.

According to the present invention, the reference voltage switching means switches to the first reference voltage as the reference voltage for detecting the decrease in the battery voltage for outputting the detection signal when the power switch is turned on. After the battery voltage drop is detected, the second reference voltage (> the first reference voltage) is set as the reference voltage for detecting the battery voltage recovery.
The difference between the second reference voltage and the first reference voltage is set to a level equal to or higher than the voltage at which the battery voltage self-recovers from the time when the power switch is turned off until the predetermined time elapses. No signal is output.

According to the ninth aspect of the invention, the detection signal from the voltage detecting means is not accepted for a predetermined starting time after the power switch is turned on. Therefore, a malfunction due to a voltage drop at the start is prevented. Absent. To prohibit acceptance of the detection signal, a method of not performing the detection operation itself or ignoring the detection signal is adopted.

According to the tenth aspect of the invention, the capacitor starts charging when the power switch is turned on. When the output voltage of the capacitor reaches a predetermined level, the detection signal is accepted. On the other hand, when the power switch is turned off, discharging of the charged electric charge is started. When the output voltage of the capacitor due to discharge drops to a predetermined level, the detection signal cannot be accepted.

According to the eleventh aspect of the present invention, the setting of the second reference voltage is canceled by the reference voltage switching means when a predetermined time has elapsed since the power switch was turned off. , The first reference voltage is set again.

According to the twelfth aspect of the invention, the reference voltage switching means holds the setting of the second reference voltage until the battery voltage exceeds the second reference voltage. If the remaining capacity is insufficient at that time, the detection signal will be output immediately.

According to the thirteenth aspect of the present invention, since the detection signal is output only during the time corresponding to the period when the battery voltage has dropped to the reference voltage or less, the notification timing can be promptly increased and the erroneous notification can be performed. With respect to the detection, no notification is made after the lapse of the erroneous detection state, and therefore no erroneous determination is made.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the battery remaining capacity notification device according to the present invention will be described with reference to FIGS. FIG. 1 is a circuit diagram showing a battery-applied device to which a first embodiment of the battery remaining capacity notification device is applied.

In this battery application device, a battery 1 and a switch 2 are provided.
A load 3 such as a motor or an internal constant voltage source is connected via the switch 3, and the load 3 is operated by turning on the switch 2.

In the voltage detection circuit 4, the input terminal 4a is the battery 1
Is connected to the positive electrode of the
Detected battery voltage Vb and preset reference voltage Vth
And when the battery voltage drops to Vb ≦ Vth,
A high level signal is output from the output terminal 4b.

The off-delay timer 5 outputs the output terminal 5b when the ON signal of the switch 2 is input to the input terminal 5a.
From which a high level signal is output. Further, when the switch 2 is turned off and the ON signal of the switch 2 is switched to the OFF signal, from this time point, for a predetermined time τ1,
The high level signal from the output terminal 5b is held.

The gate circuit 6 outputs a low level signal when the input signals to both input terminals are both high level. When the anode of the display circuit (LED) 7 is connected to the positive electrode of the battery 1 via the current limiting resistor, the cathode is connected to the output terminal of the gate circuit 6, and a low level signal is output from the gate circuit 6. The current flows through the lights.

Next, the operation will be described with reference to FIG. When the switch 2 is turned on to start using the device, a high level signal is output from the output terminal 5b of the off delay timer 5. When the battery voltage Vb gradually decreases as the equipment continues to be used, and Vb ≦ Vth, and a high level signal is output from the output terminal 4b of the voltage detection circuit 4 (at T1 in FIG. 2), the gate A low level signal is output from the circuit 6 and the LED 7 lights up.

After that, when the switch 2 is turned off and the use of the device is stopped, the output signal level of the output terminal 5b of the off-delay timer 5 is switched from the high level to the low level after a predetermined time τ1 (FIG. 2). Medium, at T2). At this point, the output signal level of the output terminal of the gate circuit 6 is switched from low level to high level, and L
ED7 goes out.

In this way, even after the switch 2 is turned off and the use of the device is stopped, the LED 7 is kept on for a predetermined time τ1, so that the user can be sure that the remaining capacity of the battery has decreased. Can be notified.

Next, a second embodiment of the battery remaining capacity notification device according to the present invention will be described with reference to FIGS. FIG. 3 is a circuit diagram showing a battery-applied device to which a second embodiment of the battery remaining capacity notification device is applied. The same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

Generally, in a battery application device having a small load current, there is no large difference in battery voltage when the switch 2 is turned on and off. However, in a battery application device with a large load current, as shown by P1 in FIG. 4A, the battery voltage Vb is restored by turning off the switch 2, and the reference voltage Vt
It may exceed h. In particular, when the remaining capacity at the time of displaying is small, the internal resistance of the battery 1 is increased, so that this phenomenon tends to appear significantly. in this case,
In the first embodiment, the output signal level of the output terminal 4b of the voltage detection circuit 4 switches from the high level to the low level,
Even during the predetermined time τ1, the LED 7 will be turned off.

The second embodiment improves this point.
A latch circuit 11 is provided between the voltage detection circuit 4 and the gate circuit 6. When the ON signal of the switch 2 is input to the reset terminal R, the latch circuit 11 receives the input terminal S
The signal input from the voltage detection circuit 4 is directly output from the output terminal Q. On the other hand, when the input signal of the switch 2 to the reset terminal R is switched from the ON signal to the OFF signal, it is latched only when the high level signal is output from the voltage detection circuit 4 to the input terminal S, and the output terminal Q It outputs a high level signal.

As described above, since the high level signal of the voltage detection circuit 4 is latched by the latch circuit 11 when the switch 2 is turned off and is input to the gate circuit 6, FIG.
As shown in P1 of (a), even if the battery voltage is restored after the switch 2 is turned off and Vb> Vth, the LED 7
Never goes out.

It should be noted that the latch function is stopped when the switch 2 is turned on because the voltage is temporarily lowered when the load is temporarily increased although the remaining capacity of the battery 1 is still sufficient. This is to prevent a voltage drop from occurring (P2 in FIG. 4A) or when the switch 2 is turned on, and detecting and latching the voltage drop. Accordingly, it is possible to prevent the LED 7 from being erroneously turned on due to a temporary voltage drop.

Next, a third embodiment of the battery remaining capacity notification device according to the present invention will be described with reference to FIGS. FIG. 5 is a circuit diagram showing a battery-applied device to which the third embodiment of the battery remaining capacity notification device is applied. The same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

Similar to the first embodiment, the voltage detection circuit 41 of the third embodiment detects the battery voltage Vb, compares it with the reference voltage Vth, and outputs a high level signal when Vb≤Vth. However, the level of the reference voltage Vth is switched depending on whether the switch 2 is on or off.

FIG. 6 is a circuit diagram showing the structure of the voltage detection circuit 41. Input terminal 41a connected to the positive electrode of the battery 1
Is connected to one of the input terminals 74a of the comparator IC74 and is also connected to the reference voltage generator 7 via a constant current source.
Connected to 3. The reference voltage generator 73 is connected to the switch 72 via a series circuit of the voltage dividing resistors R1 and R2, and the connection point of the voltage dividing resistors R1 and R2 is a comparator IC.
It is connected to the other input terminal 74b of 74. The switch 72 is turned on / off in conjunction with turning on / off of the switch 2.

As for the reference voltage Vth to the input terminal 74b of the comparator IC74, when the switch 2 is off, the switch 72 is also off, and the generated voltage of the reference voltage generating section 73 is directly input, while the switch 2 is on and the switch is turned on. When 72 is also on, the voltage generated by the reference voltage generator 73 is divided by the voltage dividing resistor R.
Switching is performed by inputting the voltage divided by 1 and R2. The voltage generated by the reference voltage generator 73 is set higher than the return voltage of the battery 1. Further, the voltage division ratio of the voltage dividing resistors R1 and R2 is set so that a divided voltage capable of detecting a voltage drop due to the decrease of the remaining capacity of the switch 2 can be obtained.

Next, the operation will be described with reference to FIG. 7. Since the switch 72 is on while the switch 2 is on, that is, when this device is in use, the voltage generated by the reference voltage generator 73 is divided. The value divided by the piezoresistors R1 and R2 is compared with the battery voltage Vb as the reference voltage Vth, and Vb ≦
When the voltage reaches Vth (T1 in FIG. 7), the voltage detection circuit 41 outputs a high level signal.

When the switch 2 is turned off and the use of the device is stopped, the switch 72 is turned off and the voltage generated by the reference voltage generator 73 becomes the reference voltage Vth as it is. It rises (P1 in FIG. 7).

Therefore, as shown by P2 in FIG.
Even if the battery voltage Vb is restored after the use of the device is stopped, the reference voltage Vth is not exceeded, so that the LED 7 is not turned off in the middle.

Next, a fourth embodiment of the battery remaining capacity notification device according to the present invention will be described with reference to FIGS. FIG. 8 is a circuit diagram showing a battery-applied device to which the fourth embodiment of the battery remaining capacity notification device is applied. The same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

The output terminal 4b of the voltage detection circuit 4 is connected to the input terminal 5 of the off-delay timer 51 via the switch 21.
The output terminal 51b of the off-delay timer 51 is connected to the cathode of the LED 7.

The switch 21 is turned on and off in conjunction with turning on and off of the switch 2, and is turned on only while the switch 2 is on, and outputs the output signal of the voltage detection circuit 4 to the off delay timer 51. It is designed to communicate.

The off-delay timer 51 has an input terminal 5
When a high level signal is input to 1a, the output terminal 51b
Is to output a low level signal. Further, the output signal level is switched from the low level to the high level after a predetermined time τ1 from the time when the input signal to the input terminal 51a is switched from the high level to the low level.

Next, the operation will be described with reference to FIG. 9. When the battery voltage Vb drops to Vb.ltoreq.Vth while the switch 2 and the switch 21 are on, that is, when the device is in use (T1 in FIG. 9). ), The voltage detection circuit 4 outputs a high level signal, the off-delay timer 51 outputs a low level signal, and the LED 7 lights up.

When the switch 2 is turned off and the use of the device is stopped, the switch 21 is turned off and the input terminal of the off-delay timer 51 is opened, so that the battery voltage Vb after the switch 2 is turned off. It is possible to reliably continue the lighting of the LED 7 for a predetermined time τ1 regardless of the restoration of the above condition.

Next, a fifth embodiment of the battery remaining capacity notification device according to the present invention will be described with reference to FIGS. FIG. 10 is a circuit diagram showing a battery-applied device to which the fifth embodiment of the battery remaining capacity notification device is applied. The first
The same components as those in the fourth embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the fifth embodiment, a series circuit composed of voltage dividing resistors R11 and R12 and a switch 22 is connected in parallel with the battery 1. The switch 22 turns on the switch 2,
It is turned on and off in conjunction with turning off.

In the voltage detection circuit 42, the output terminal is directly connected to the input terminal of the off-delay timer 51, the input terminal is connected to the connection point of the voltage dividing resistors R11 and R12, and the battery voltage Vb or its divided voltage Vr is obtained. Is entered. Then, the input voltages Vb and Vr are compared with the reference voltage Vth, and when Vb≤Vth or Vr≤Vth, a high level signal is output.

The reference voltage Vth and the divided voltage Vr of the voltage dividing resistors R11 and R12 are relatively set so that it can be detected that the remaining capacity of the battery 1 has decreased and the battery voltage Vb has decreased. It is a thing.

Next, the operation will be described with reference to FIG. 11. When the switch 2 and the switch 22 are turned on, that is, when the device is in use, the battery voltage Vb drops and the divided voltage Vr becomes Vr ≦ Vth ( 11, T1), the voltage detection circuit 42 outputs a high level signal, the off-delay timer 51 outputs a low level signal, and the LED 7 lights up.

When the switch 2 is turned off and the use of the device is stopped, the switch 22 is turned off, and the voltage detection circuit 42 is almost equal to the battery voltage Vb through the resistor R11 (the voltage drop at the resistor R11 is subtracted). Voltage) is input. Therefore, normally, Vb> Vth,
The output signal of the voltage detection circuit 42 switches to low level. Since the off-delay timer 51 outputs a low level signal for a predetermined time τ1 from this point, during this period, L
Lighting of ED7 can be continued.

If the battery voltage Vb further decreases during use of the device and becomes Vb ≦ Vth, the output signal level of the voltage detection circuit 42 remains high level even after the switch 2 is turned off, and the voltage is turned off. The delay timer 51 may continue to output the low level signal, and the LED 7 may not be turned off. To prevent this, the reference voltage Vth is set to the LED.
The voltage may be set to a value equal to or lower than the forward voltage of 7 so that the LED 7 itself cannot be turned on. Also, as the display circuit 7, L
If a member other than the ED is used, the reference voltage Vth may be set to the operating voltage of the member or less.

Next, a sixth embodiment of the battery remaining capacity notification device according to the present invention will be described with reference to FIGS. FIG. 12 is a circuit diagram showing an off-delay timer of a battery-applied device to which the sixth embodiment of the battery remaining capacity notification device is applied. The same parts as those in the fourth and fifth embodiments are designated by the same reference numerals, and the description thereof will be omitted.

In the sixth embodiment, in the fourth and fifth embodiments, when the device is in use, that is, when the switch 2 is on, the timer function of the off-delay timer 51 is not operated and the switch 2 is off. The timer function is activated only when the operation is performed.

The off-delay timer 51 has an input terminal 5
A resistor R5 and a capacitor C5 are provided between 1a and the output terminal 51b.
The time constant circuit consisting of and the inverter 8 are connected in series. In addition, the switch 2 is turned on in parallel with the resistor R5,
A switch 24 that turns on and off in conjunction with turning off is connected.

Next, the operation will be described with reference to FIG. 13. Since the switch 24 is on while the switch 2 is on, that is, while the device is in use, the off-delay timer 51 causes the voltage detection circuit 4 ( 42), the low level signal input from the inverter 8 is inverted by the inverter 8 to output a high level signal, so that the LED 7 is turned off.

When the battery voltage Vb decreases and a high level signal is input from the voltage detection circuit 4 (42) (T1 in FIG. 13), the capacitor C5 is instantly charged, and this high level signal is output to the inverter. Inversion at 8 outputs a low level signal, and the LED 7 lights up.

Next, when the switch 2 is turned off and the use of the device is stopped, the switch 24 is also turned off and the input of the high level signal from the voltage detection circuit 4 (42) is stopped. Therefore, as indicated by P1 in FIG. 13B, the electric charge charged in the capacitor C5 is gradually discharged through the resistor R5, so that the time of τ1 until the threshold level of the inverter 8 is reached τ1 of the LED 7 is reached. Lighting can be continued.

As described above, since the timer function of the off-delay timer 51 is not operated while the switch 2 is on, that is, when the device is in use, when the battery voltage Vb temporarily drops during use of the device. However, it is possible to prevent the lighting of the LED 7 from continuing for the time τ1.

Next, a seventh embodiment of the battery remaining capacity notification device according to the present invention will be described with reference to FIGS. 14 and 15. FIG. 14 is a circuit diagram showing a battery-applied device to which the seventh embodiment of the remaining capacity notification device for the same battery is applied. The first
The same parts as those in the embodiment are designated by the same reference numerals and the description thereof will be omitted.

In the voltage detection circuit 43, the input terminal 43a is connected to the positive electrode of the battery 1 via the switch 25, and the battery voltage Vb can be detected. Then, the detected battery voltage Vb is compared with the reference voltage Vth, and when Vb ≦ Vth, a low level signal is output from the output terminal 43b.

In the display circuit (LED) 7, the anode is connected to the positive electrode of the battery 1 via the current limiting resistor and the switch 25, and the cathode is the output terminal 43b of the voltage detection circuit 43.
, The switch 25 is turned on, and the output terminal 4
The light is turned on when a low level signal is output from 3b.

The off-delay timer 52 has an output terminal 5
The ON / OFF of the switch 25 is controlled by the signal output from 2b. The ON / OFF signal of the switch 2 is input to the input terminal 52a, and while the switch 2 is ON and from the time of switching from ON to OFF. The control is performed so that the ON state of the switch 25 is maintained for a predetermined time τ1.

Next, the operation will be described with reference to FIG. 15. When the switch 2 is on, that is, while the device is in use, the switch 25 is on, and the battery voltage Vb drops to Vb ≦ Vth. (T1 in FIG. 15), the voltage detection circuit 43 outputs a low level signal, and the LED 7 lights up.

When the switch 2 is turned off and the use of the device is stopped, the switch 25 is maintained in the on state for a predetermined time τ1 from this point.
Continues to be turned on, and when the switch 25 is turned off, the power supply is cut off and the LED 7 is turned off.

Therefore, the user can be surely notified that the remaining capacity of the battery is low. Further, since the operation of the voltage detection circuit 43 is stopped after the elapse of the predetermined time τ1, it is possible to reduce the current consumption when the device is not used.

In order to prevent the influence of the battery voltage Vb returning after the switch 2 is turned off,
A latch circuit 11 (FIG. 3) is provided between the voltage detection circuit 43 and the LED 7 to hold the output signal, or the voltage detection circuit 43 is configured as shown in FIG.
It suffices to switch th.

Next, an eighth embodiment of the battery remaining capacity notification device according to the present invention will be described with reference to FIGS. FIG. 16 is a circuit diagram showing a battery-applied device to which the eighth embodiment of the battery remaining capacity notification device is applied. The first
The same parts as those in the embodiment are designated by the same reference numerals and the description thereof will be omitted.

The off-delay timer 5 outputs a high-level signal from the time when the switch 2 is turned on to a predetermined time τ1 after turning off the switch 2, and turns on the transistor Q1 during this time to supply power from the battery 1 to the voltage detection circuit 44. I do. The voltage detection circuit 44 receives the power supply (see FIG. 17).
The signal at the middle point A) is set to be operable. This voltage detection circuit 44 includes a comparator IC44
1, a reference voltage generator 442 and a transistor 443, and voltage dividing resistors R21 and R22 connected in series.
And a resistor R23 connected in parallel with the resistor R22. The middle point of the voltage dividing resistors R21 and R22 is a comparator IC.
441 is connected to one input end, and the reference voltage generating unit 442 is connected to the other input end. Reference voltage generator 4
42 is set to a level Vtho that detects a decrease in the battery voltage Vb.

The transistor 443 is connected in series with the resistor R23, and while the comparator IC441 is outputting a low level, the battery voltage Vb is kept at the resistors R21 and R2.
The voltage divided by 2 is input to the input terminal of the comparator IC441, while it is turned on while the comparator IC441 is outputting a high level, the resistors R22 and R23 are connected in parallel, and the battery voltage Vb is changed to the resistor R21. Resistance value of
The voltage divided by the parallel combined resistance value of the resistors R22 and R22 is input to the input terminal of the comparator IC441. In this way, by switching the voltage division ratio, it is possible to make it equivalent to switching and changing the reference voltage for relatively detecting the decrease in the battery voltage.

That is, when the output terminal of the comparator IC441 is low level, the equivalent reference voltage Vth1
Becomes Vtho · (R21 + R22) / R21. On the other hand, if the output terminal of the comparator IC441 is at high level, the equivalent reference voltage Vth2 is Vtho · (R2
1 + R22 // R23) / R21. In addition, R22 //
R23 represents a parallel combined resistance value of the resistors R22 and R23. Further, there is a relation of Vth1 <Vth2, and the resistance R
23 has a resistance value of Vth2-Vth1 set to a level equal to or higher than a level at which the voltage of the battery 1 self-recovers and rises for a predetermined time τ1 after the switch 2 is turned off as described later. Has been adopted.

The transistor 61 is connected in series to the LED 7, and its base is connected to the output terminal of the comparator IC441. Then, the comparator IC 441 is turned on while the high-level output signal is output,
The ED7 is turned on.

Next, the operation will be described with reference to FIG. 17. The voltage detection circuit 44 operates while the switch 2 is on, that is, while the load 3 is being driven, and first, the battery voltage drops to the reference voltage Vth1. Whether (that is, whether the divided voltage value of the battery voltage has become equal to or lower than the reference voltage Vtho) is detected. When the battery voltage drops below the reference voltage Vth1 (T1 in FIG. 17), the comparator IC44
1 outputs a high level, turns on the transistor 61 to turn on the LED 7, and causes the transistor 443 to turn on.
Is turned on to switch the reference voltage from Vth1 to Vth2. After this, when the switch 2 is turned off, the battery 1
However, since the level of Vth2 is set to be equal to or higher than the self-recovery level, the comparator IC441 does not invert to the low level during at least the predetermined time τ1. Lights up τ1
Holds only for hours.

As described above, with a simple circuit configuration without using a latch circuit, even if the voltage rises due to the self-recovery of the battery voltage after the switch 2 is turned off, the predetermined time τ1
Since it is possible to ensure the lighting of, the user can be surely notified that the remaining capacity of the battery has decreased.

Next, a ninth embodiment of the battery remaining capacity notification device according to the present invention will be described with reference to FIGS. 18 and 19. FIG. 18 is a circuit diagram showing a battery application device to which the ninth embodiment of the battery remaining capacity notification device is applied. The same parts as those in the first and eighth embodiments are designated by the same reference numerals, and the description thereof will be omitted.

The eighth embodiment described above has no problem for a device in which the starting current of the load 3 when the switch 2 is turned on does not become particularly large, but the starting current such as a motor is several times larger than the steady current. In equipment that reaches such a level, the battery voltage drops below the reference voltage Vth1 when the switch is turned on, and thereafter the detection state is continued due to the hysteresis of the reference voltage,
There is a problem that the LED 7 may be kept lit even though the remaining capacity of the battery remains. The ninth embodiment solves this problem.

When the switch 2 is turned on, the on-delay timer 9 outputs a high level signal with a delay of a predetermined time τ2, and at the time of turning off the switch 2, returns the output to a low level (A in FIG. 19). (Point signal), and the output signal is input to the off-delay timer 5. In this way, by not supplying power to the voltage detection circuit 44 for the time τ2 required for starting the load 3, the battery voltage drop due to the starting current (FIG. 19 (d), time T0) is prevented. No more false detection. As a method of not accepting the detection of the decrease of the battery voltage in this way, in addition to the method of setting the starting period τ2 described above, a delay circuit for delaying the rise due to the power supply is provided in the voltage detection circuit 44. May be.

As described above, in the eighth and ninth embodiments, the power supply to the voltage detection circuit 44 is stopped after the predetermined time τ1 and the reference voltage is automatically returned to Vth1. At times, even if the battery has a sufficient remaining capacity, even if an erroneous detection is performed and an erroneous display is performed, it can be restored to the normal operation at the next use, and the erroneous display can be suppressed only once.

FIG. 20 shows an example of a circuit configuration for realizing the on-delay timer 9 and the off-delay timer 5 shown in FIG. In FIG. 20, a constant voltage generation circuit 92 that outputs a constant voltage V _SL is connected to one of the input ends of the comparator IC 91, and a transistor Q3 that operates according to an ON / OFF signal from the switch 2 is connected to the other input end. They are connected via a time constant circuit composed of a resistor R30 and a capacitor C30. A constant current source 93 is connected to the other input terminal of the comparator IC91. The capacitor C30 is adapted to generate a terminal voltage Vu equal to or higher than the constant voltage V _SL by the constant current source 93.

The operation of this circuit configuration will be described with reference to FIG. 21. The capacitor C30 receives a current from the constant current source 93 in a state where the switch 2 is left to _reach a predetermined high level Vu (> V _SL ). Yes, therefore, the output terminal of the comparator IC91 is at low level. Therefore, the transistor Q1 shown in FIG. 18 is turned off, and the driving of the voltage detection circuit 44 is stopped. After this, the switch 2 is turned on and the transistor Q3
When a high level ON signal is input to the base of the transistor Q3, the transistor Q3 is turned ON. When the transistor Q3 is turned on, the electric charge stored in the capacitor C30 is discharged through the resistor R30. This discharge is at a level Vd at which the charging current from the constant current source 93 and the discharging current are in equilibrium.
It gradually decreases toward (<V _SL ). Therefore, switch 2
After being turned on, the comparator IC91 maintains the low level output until the time τ2 when the terminal voltage of the capacitor C30 drops from Vu to V _SL (that is, the start-up time of the load 3), and thereafter, the comparator IC91 inverts to the high level. , Transistor Q
1 is turned on to enable the voltage detection circuit 44.

On the other hand, thereafter, when the switch 2 is turned off and the transistor Q3 is turned off, the capacitor C30 stops discharging and starts charging only with the charging current from the constant current source 93. Therefore, the terminal voltage of the capacitor C30 gradually increases from Vd to Vu. Capacitor C30
The terminal voltage exceeds the constant voltage V _SL after τ1 has passed since the switch 2 was turned off, and the comparator IC91 is inverted to the low level by this, so that the operation of the voltage detection circuit 44 is stopped. By changing the charging / discharging current of one capacitor C30 in this way, both on-delay and off-delay can be performed with a simple circuit configuration.

Next, a tenth embodiment of the battery remaining capacity notification device according to the present invention will be described with reference to FIGS. FIG. 22 is a circuit diagram showing a battery application device to which the tenth embodiment of the remaining battery capacity notification device is applied. The same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

The internal circuit configuration of the voltage detection circuit 45 is similar to that of the eighth and ninth embodiments, and the power supply is directly received from the battery 2. Therefore, the voltage detection circuit 4
In No. 5, after the reference voltage is changed from Vth1 to Vth2, the set state of the reference voltage Vth2 is maintained until the battery is replaced or the battery is charged.

Next, the operation will be described with reference to FIG. 23. At a certain time T01, the switch 2 is turned on, and the eighth
As shown in the embodiment, the battery voltage Vb and the reference voltage Vth1
Is compared with the reference voltage Vth1 at the time when the battery voltage is T1.
When it drops below, the lighting of the LED 7 is started. The lighting of the LED 7 is continued for a predetermined time τ1 after the switch 2 is turned off, and is turned off at the time T2. The reference voltage is switched from Vth1 to Vth2 at time T1. Further, although the battery voltage slightly recovers itself by turning off the switch 2, as described in the eighth embodiment, even if the recovery level exceeds the reference voltage Vth1,
It is the reference voltage Vth2 or less.

After that, at the time of T02, when the next use is started, the battery voltage is compared with the reference voltage Vth2. Therefore, the voltage detection circuit 45 can immediately detect the decrease in the remaining capacity of the battery, and the LED 7 can notify that effect. In FIG. 23, time τ3 represents the time required from the turning on of the switch 2 to the detection of the decrease in the remaining capacity (that is, the notification by the LED 7) when the reference voltage is returned to Vth1. As described above, by holding the reference voltage at Vth2 after it is confirmed that the remaining capacity is once reduced, it is possible to effectively notify that effect at the same time as the start of use at the time of next use, so that the time lag τ3. Can be eliminated.

Next, an eleventh embodiment of the battery remaining capacity notification device according to the present invention will be described with reference to FIGS. 24 and 25. FIG. 24 is a circuit diagram showing a battery application device to which the eleventh embodiment of the battery remaining capacity notification device is applied. The same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

In this embodiment, the voltage detection circuit 4 and the LED are
A time constant circuit composed of a resistor R40 and a capacitor C40 and a NOR circuit 62 are interposed between the seven. The output end of the voltage detection circuit 4 is connected to one input end of the NOR circuit 62, and the voltage detection circuit 4 is connected to the other input end via the time constant circuit. The NOR circuit 62 has a threshold voltage Vthx. On the other hand, the capacitor C40 that constitutes the time constant circuit is charged to at least a level of Vthx or higher when the high level signal from the voltage detection circuit 4 is input, and the capacitor R40 is charged from the saturated state to the resistor R40. When the discharge is started via the above, the level Vt
It has come down to hx.

Next, the operation will be described with reference to FIG. Now, assuming that the switch 2 is turned on at the time T0 and the battery voltage Vb is lowered to the detection level Vth or less for a minute time τ4 by the starting current at this time, τ is started from the time T0.
A high level signal is output from the voltage detection circuit 4 for only 4 hours. The high level signal for this τ4 time is the NOR circuit 6
2 is input to one input terminal, the output side of the NOR circuit 62 is inverted to the low level, and the LED 7 starts lighting. On the other hand, it is assumed that the capacitor C40 is charged for the output time τ4 of the high level signal and the terminal voltage of the capacitor C40 has risen to a level slightly exceeding the level Vthx as shown by the signal level at point B in FIG.
Then, when τ4 time ends, the capacitor C40 starts discharging with a required time constant via the resistor R40, and decreases to the level Vthx in τ5 time from the start of discharging. Therefore, in the NOR circuit 62, the output side is maintained at the low level for (τ4 + τ5) time from the time point T0, which causes LE to
D7 is lit for (τ4 + τ5) time.

On the other hand, the use of the load 3 is continued, the remaining capacity of the battery is lowered, and the battery voltage Vb becomes the reference voltage Vt at the time T1.
When the voltage is reduced to h or less, the NOR circuit 62 outputs a low level and turns on the LED 7 as described above. At this time,
When the high level signal output from the voltage detection circuit 4 continues for a time corresponding to the time constant of the time constant circuit or more,
The terminal voltage of the capacitor C40 is saturated (T in FIG. 25).
11). In this state, when the switch 2 is turned off, the capacitor C40 starts discharging from the saturation voltage level, so that the terminal voltage τ decreases to Vthx.
It takes one hour, and as a result, the notification of the decrease in the remaining capacity of the battery is held for τ1 after the switch 2 is turned off.

The sudden voltage drop is not limited to the start-up,
It may occur at any time due to a sudden load change during use, but such a case can also be dealt with.

As described above, even if the battery voltage suddenly drops during use and an erroneous notification is given, the display can be completed in a short time corresponding to the fluctuation time and the remaining capacity is reduced. When the detection is correct, the notification is continued for τ1 hour. Therefore, the time width of the voltage drop is measured to eliminate the error notification, and the detection signal is output after determining the presence / absence of correct / incorrect detection from the measurement result. As compared with the case of such a configuration, the circuit configuration can be simplified and quick display can be performed without causing a time lag.

[0103]

As described above, according to the first aspect of the present invention, when the battery voltage detected during the operation of the device becomes equal to or lower than the preset reference voltage, a notification signal is output, and the notification signal The output is continued until a predetermined time elapses after the operation of the device is stopped, and the notification means is operated in response to the notification signal. Therefore, it is possible to reliably notify the user of the decrease in the remaining capacity of the battery.

According to the second and third aspects of the present invention, even when the battery voltage is restored after the operation of the device is stopped, the user is surely informed of the decrease in the remaining capacity of the battery regardless of the battery voltage level. be able to.

According to the invention of claim 4, a switch interlocking with the power switch is provided between the voltage detecting means and the control means, and a delay for holding the output of the notification signal for a predetermined time after the power switch is turned off. Since a circuit is provided so that the voltage detection result due to the battery voltage recovery after the power switch is turned off is not guided to the control means side by the switch that turns off in synchronization, the notification operation by the notification means is ensured. You can

Further, according to the invention of claim 5, the divided voltage is inputted to the voltage detecting means only while the power switch is on. Therefore, after the power switch is turned off, the delay circuit reliably operates for a predetermined time. Only the output of the notification signal is held, and the notification operation becomes reliable.

Further, according to the invention of claim 6, a delay circuit for outputting the notification signal in synchronization with the output of the detection signal and for activating the timer function after the power switch is turned off is provided so that the power switch is temporarily turned on. Since the timer function is prevented from operating even if the battery voltage drops, the erroneous display can be prevented.

Further, according to the invention of claim 7, the control signal is output during the operation of the device, and this output is held until a predetermined time elapses after the operation of the device is stopped, and the control signal is output. By enabling the voltage detection means and the notification means only while the equipment is operating, the voltage detection means is activated only while the equipment is operating and until a predetermined time elapses after the equipment stops operating. Power consumption can be reduced.

Further, according to the invention of claim 8, when the power switch is turned on, the first reference voltage is switched and set as the reference voltage for detecting the decrease in the battery voltage for outputting the detection signal. After the detection, the second reference voltage (> the first reference voltage) is switched and set as the reference voltage for detecting the recovery of the battery voltage, and the difference between the second reference voltage and the first reference voltage is determined after the power switch is turned off. Since the battery voltage is set to a level higher than the self-recovery level before the time elapses, it is possible to prevent the detection signal from being erroneously not output during this time, and to reliably notify the user of the remaining battery charge. You can

Further, according to the invention of claim 9, the detection signal from the voltage detecting means is not accepted for a predetermined starting time after the power switch is turned on, so that the erroneous detection due to the voltage drop at the time of starting is prevented. can do.

According to the tenth aspect of the present invention, both the start-up time signal after the power switch is turned on and the notification holding time signal after the power switch is turned off can be easily provided with a simple circuit configuration of one capacitor. Can be generated.

According to the eleventh aspect of the invention, the setting of the second reference voltage is canceled when a predetermined time elapses from the turning off of the power switch, so that the battery voltage is surely reduced when the load is used next time. Can be detected.

According to the twelfth aspect of the invention, the setting of the second reference voltage is held until the battery voltage exceeds the second reference voltage, so that the remaining capacity is already insufficient at the start of the next load use. When the error occurs, the detection signal can be output immediately, and quick and accurate notification can be performed.

According to the thirteenth aspect of the present invention, the detection signal is output only during the time corresponding to the period when the battery voltage drops below the reference voltage, and the notification is performed only during that time. At the same time, in the case of an erroneous detection, the notification is canceled in a very short time, so that the determination can be facilitated. Further, it can be realized with an extremely simple circuit configuration as compared with the circuit configuration in which whether the detection is correct or not is determined from the detection time width and if the detection is normal, notification is performed.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a battery application device to which a first embodiment of a battery remaining capacity notification device according to the present invention is applied.

FIG. 2 is a diagram showing the operation of the battery application device of the first embodiment,
(A) is the operation of the switch 2, (b) is the signal level at point A in FIG. 1, (c) is the transition of the battery voltage, (d) is the signal level at point B in FIG. 1, and (e) is the display circuit. 7 shows the operation.

FIG. 3 is a circuit diagram showing a battery application device to which a second embodiment of the battery remaining capacity notification device according to the present invention is applied.

FIG. 4 is a diagram showing the operation of the battery application device of the second embodiment,
3A is a transition of the battery voltage, FIG. 3B is a signal level at a point B in FIG. 3, FIG. 3C is a signal level at a point C in FIG. 3, D is an operation of the switch 2, and FIG. Signal level at point A,
(F) shows the operation of the display circuit 7.

FIG. 5 is a circuit diagram showing a battery application device to which a third embodiment of the battery remaining capacity notification device according to the present invention is applied.

6 is a circuit diagram showing a voltage detection circuit 41 of FIG.

FIG. 7 is a diagram showing the operation of the battery application device of the third embodiment,
(A) is the operation of the switch 2, (b) is the transition of the battery voltage,
(C) shows the output signal of the voltage detection circuit 41.

FIG. 8 is a circuit diagram showing a battery application device to which a fourth embodiment of the battery remaining capacity notification device according to the present invention is applied.

FIG. 9 is a diagram showing the operation of the battery application device of the fourth embodiment,
(A) is the operation of the switch 2 (21), (b) is A of FIG.
Signal level at point, (c) signal level at point B in FIG.
(D) shows the operation of the display circuit 7.

FIG. 10 is a circuit diagram showing a battery application device to which a fifth embodiment of the battery remaining capacity notification device according to the present invention is applied.

FIG. 11 is a diagram showing an operation of the battery application apparatus of the fifth embodiment, (a) operation of the switch 2 (22), (b) battery voltage transition, (c) output of the voltage detection circuit 42. Signal level, (d) shows the operation of the display circuit 7.

FIG. 12 is a circuit diagram showing an off-delay timer 51 of a battery-applied device to which a sixth embodiment of the remaining battery capacity notification device according to the present invention is applied.

13A and 13B are diagrams showing the operation of the battery application apparatus according to the sixth embodiment, where FIG. 13A is a point A in FIG. 12, and FIG. 13B is a point B in FIG.
(C) shows the signal level at point C in FIG.

FIG. 14 is a circuit diagram showing a battery application device to which a seventh embodiment of the battery remaining capacity notification device according to the present invention is applied.

15A and 15B are diagrams showing the operation of the battery-applied device of the seventh embodiment, in which FIG. 15A shows the operation of the switch 2 and FIG.
, And (c) shows the operation of the display circuit 7.

FIG. 16 is a circuit diagram showing a battery application device to which an eighth embodiment of the battery remaining capacity notification device according to the present invention is applied.

FIG. 17 is a diagram showing the operation of the battery-applied device of the eighth embodiment, in which (a) is the operation of the switch 2, (b) is the signal level at point A in FIG. 16, and (c) is the battery voltage and reference voltage. (D) shows the operation of the display circuit 7.

FIG. 18 is a circuit diagram showing a battery application device to which a ninth embodiment of the battery remaining capacity notification device according to the present invention is applied.

FIG. 19 is a diagram showing the operation of the battery-applied device of the ninth embodiment, in which (a) is the operation of the switch 2, (b) is the signal level at point A in FIG. 18, and (c) is point B in FIG. Signal level of
(D) shows the transition of the battery voltage, and (e) shows the operation of the display circuit 7.

FIG. 20 is a circuit diagram showing a circuit configuration including an on-delay timer and an off-delay timer applied to the ninth embodiment.

21 is a diagram for explaining the operation of the circuit diagram of FIG.
20A shows the operation of the switch 2, FIG. 20B shows the voltage level at the point A in FIG. 20, and FIG. 20C shows the state of the voltage detection operation.

FIG. 22 is a tenth embodiment of the battery remaining capacity notification device according to the present invention.
It is a circuit diagram which shows the battery application device to which an Example is applied.

FIG. 23 is a diagram showing the operation of the battery-applied device of the tenth embodiment, wherein (a) is the operation of the switch 2, (b) is the signal level at point A in FIG. 22, (c) is the transition of the battery voltage, (D) shows the operation of the display circuit 7.

FIG. 24 is an eleventh embodiment of the battery remaining capacity notification device according to the present invention.
It is a circuit diagram which shows the battery application device to which an Example is applied.

FIG. 25 is a diagram showing the operation of the battery application apparatus of the eleventh embodiment, (a) operation of the switch 2, (b) transition of battery voltage, (c) signal level at point A in FIG. 24, Figure 2 (d)
4 shows the signal level at point B, (e) shows the operation of the display circuit 7.

FIG. 26 is a circuit diagram showing a battery application device to which a conventional battery remaining capacity notification device is applied.

FIG. 27 is a diagram showing the operation of a conventional battery application device,
(A) shows the operation of the switch 102, (b) shows the transition of the battery voltage, and (c) shows the operation of the display circuit 105.

[Explanation of symbols]

1 Battery 2 Switch (Power Switch) 3 Load 4, 41, 42, 43, 44, 45 Voltage Detection Circuit (Voltage Detection Means) 5, 51, 52 Off-Delay Timer (Control Means) 6 Gate Circuit (Control Means) 61 Transistors 62 NOR circuit 7 Display circuit (informing means) 8 Inverter 9 On-delay timer 11 Latch circuit (holding means) 22, 24, 25, 72 Switch 73, 442 Reference voltage generator 74, 441, 91 Comparator IC C5 Capacitor R1, R2 , R11, R12, R21, R22, R23
Voltage dividing resistors Q1, Q3, 443 Transistors R30, R40 Resistors forming a time constant circuit C30, C40 Capacitors forming a time constant circuit

Claims (13)

[Claims] 1. A battery-applied device that is interposed between a battery and a load and has a power switch for turning on and off the operation of the device. The battery voltage is detected, and the detected battery voltage is a preset reference voltage. A voltage detection means that outputs a detection signal at the following time, and a notification signal when the detection signal is output when the power switch is on, and outputs a predetermined signal after the power switch is switched from on to off. A battery remaining capacity notification device comprising: a control unit that holds the output of the notification signal until a lapse of time; and a notification unit that operates in response to the notification signal. 2. The holding means for holding the output of the detection signal when the power switch is switched from on to off, and the control means for outputting the control signal when the power switch is on to supply the power. After the switch is switched from on to off, the control signal output means continues to output the control signal until a predetermined time elapses, and the notification signal, both the detection signal and the control signal are output. The battery remaining capacity notifying device according to claim 1, wherein the battery remaining capacity is output while the battery is operating. 3. The control means includes reference voltage level switching means for changing the reference voltage to a higher level when the power switch is off, and outputs a control signal when the power switch is on. Then, after the power switch is switched from ON to OFF, the control signal is continuously output until a predetermined time elapses, and the notification signal, both the detection signal and the control signal are output. The remaining capacity notification device for a battery according to claim 1, wherein the remaining capacity notification device is configured to output during a short period. 4. The battery remaining capacity notifying device according to claim 1, further comprising a switch which is interposed between the voltage detecting means and the control means and which is turned on and off in association with turning on and off of the power switch. The control means outputs the notification signal when the detection signal is input from the voltage detection means, and holds the output of the notification signal until a predetermined time elapses after the switch is turned off. A battery remaining capacity notification device comprising: 5. The battery remaining capacity notifying device according to claim 1, wherein the voltage dividing circuit divides the voltage of the battery, and a switch for guiding the divided voltage to the voltage detecting means when the power switch is turned on. The voltage detection means is configured to compare the divided voltage with a reference voltage preset as a battery voltage when the power switch is turned on, and the control means outputs the detection signal. The remaining battery capacity informing device comprising a delay circuit that outputs the annunciation signal and holds the output of the annunciation signal until a predetermined time elapses after the output of the detection signal is stopped. . 6. The battery remaining capacity notification device according to claim 4, wherein the delay circuit outputs the notification signal in synchronization with the output of the detection signal. 7. A reference voltage in which a battery voltage is detected in a battery-applied device that is interposed between a battery and a load and that has a power switch for turning on and off the operation of the device, and the detected battery voltage is preset. The voltage detection means that outputs a detection signal at the following times, the notification means that operates upon receiving the detection signal, the control signal that is output when the power switch is turned on, and the power switch that is turned on are turned off. After that, a control means for holding the output of the control signal until a predetermined time has elapsed, and a switching means for enabling the voltage detection means and the notification means only while the control signal is being output are provided. A battery remaining capacity notification device characterized by the above. 8. The voltage detecting means sets, as the reference voltage, a first reference voltage for detecting a decrease in battery voltage for outputting the detection signal after the power switch is turned on, and the battery is set to the first reference voltage. After the voltage drop is detected, it has a reference voltage switching means for switching to the second reference voltage (> the first reference voltage), and the second reference voltage is turned off as compared with the first reference voltage. 2. The battery remaining capacity notification device according to claim 1, wherein the battery voltage is set to a level equal to or higher than a level at which the battery voltage self-recovers from the time until the predetermined time elapses. 9. The remaining battery capacity according to claim 8, wherein the control means does not accept the detection signal from the voltage detection means for a predetermined start-up time after the power switch is turned on. Notification device. 10. The control means includes a capacitor that starts charging when the power switch is turned on and starts discharging when the power switch is turned off, and outputs a signal when the output voltage of the capacitor is equal to or higher than a predetermined level. ,
10. The battery remaining capacity notification device according to claim 9, wherein the detection signal is received during the output period of this signal. 11. The battery remaining capacity notification device according to claim 8, wherein the reference voltage switching means is configured to cancel the setting of the second reference voltage when the predetermined time has elapsed. . 12. The battery according to claim 8, wherein the reference voltage switching means holds the setting of the second reference voltage until the battery voltage exceeds the second reference voltage. Remaining capacity notification device. 13. The battery remaining capacity notification device according to claim 1, wherein the detection signal is output only for a time period corresponding to a period in which the battery voltage drops to a reference voltage or lower to perform notification. A battery remaining capacity notification device characterized by the above.