JP2002040115A - Voltage-monitoring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately issue an alarm about reduction in the voltage of a battery for supplying electric power used for driving of a load, such as the cutoff valve of a gas meter by monitoring the reduction. SOLUTION: A cutoff number counter 5 counts the number of cutoffs of the cutoff valve V and outputs the power consumption value of the battery which are necessary for one cutoff each time a cutoff is counted to a battery remaining capacity counter 7. A reset number counter 4 counts the number of resets of the cutoff valve V and outputs the power consumption value of the battery necessary for one reset, each time one reset is counted to the battery remaining capacity counter 7. The battery remaining capacity counter 7 subtracts the power consumption value of the battery necessary for one cutoff or one reset, from the previously stored battery remaining capacity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voltage monitoring device for monitoring a voltage drop of a battery supplying electric power used for driving a load such as a shut-off valve of a gas meter and for accurately warning the voltage drop.

[0002]

2. Description of the Related Art Batteries are widely used for driving a load that is difficult to connect to a commercial power supply or for driving a load with a voltage and current different from those of a commercial power supply. There is a gas meter provided in each home or the like for measuring gas usage.

In this gas meter, a flow meter that measures the flow rate of a gas flowing through an internal flow path as a gas usage amount, and a gas supply passage based on the measurement result of the flow meter or a time-series change in the measurement result. Gas leak detecting means for determining whether or not a leak has occurred, and shutoff for forcibly shutting off an internal flow path when the gas leak detecting means determines that a gas leak has occurred. The flow meter, the gas leak detecting means, the shutoff valve, and the like are driven by a lithium battery built in the gas meter.

Further, this gas meter has a voltage necessary for a valve closing operation by a shut-off valve so that the internal flow passage is forcibly shut off when the gas leak detecting means judges the gas leak. A battery voltage drop inspection device for periodically checking whether or not the battery remains in the lithium battery is provided together with a flow meter, gas leak detection means, a shutoff valve, and the like.

[0005] In the gas meter described above, as a result of the inspection by the battery voltage drop inspection device, if it is determined that the voltage of the lithium battery has decreased enough to decrease the voltage required for the valve closing operation by the shut-off valve, the gas leak is detected. The shutoff valve is forcibly shut off regardless of the presence or absence of the pressure.

FIG. 12 shows, for example, a voltage monitoring device disclosed in Japanese Patent Publication No. 4-2316. In this apparatus 1, a flow signal of gas or the like is input from a flow sensor FS, and a drive signal is input to a base of a transistor Q1 for driving a shut-off valve V based on the input signal to perform an ON operation to perform a forced shut-off control. A part C is provided. Further, the control section C performs an ON / OFF operation by passing a pulse signal at predetermined intervals through the resistor R2 to the base of the transistor Q2 in which the positive electrode of the lithium battery B is connected to the collector. As a result, the transistor Q
A voltage drop occurs in the shut-off valve equivalent resistance R2 connected between the emitter of No. 2 and the ground. The voltage drop detector Dv monitors the voltage drop of the lithium battery B by monitoring the voltage drop at every predetermined monitoring cycle in synchronization with the operation cycle of the transistor Q2.

[0007]

However, batteries are not limited to lithium batteries, and battery voltage characteristics depend on temperature.
For example, when checking the battery voltage, the temperature is high and there is a margin in the operation guarantee voltage of the shut-off valve, but after that, there is a case where the operation guarantee voltage cannot be secured due to a decrease in the temperature, and there is a problem that the shut-off valve does not operate when necessary. there were.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to reliably detect the life of a battery due to a voltage drop even if the voltage of the battery rises temporarily due to a rise in temperature. The purpose is to obtain a voltage monitoring device that can.

[0009]

According to a first aspect of the present invention, there is provided a voltage monitoring apparatus for inputting an operation signal of an apparatus using a battery as a power source, as shown in FIG. An operation number counting means for counting the number of times the battery load is increased by operating the device in a predetermined state from the operation signal and the number of times the battery load is returned to a normal load; The remaining battery capacity counting means for subtracting the power consumption of the battery corresponding to the number of times and the number of times of battery load return from the remaining capacity of the currently used battery set in advance and counting a new remaining battery capacity, and the new remaining battery capacity. Comparing means for comparing whether or not the new remaining battery capacity is lower than the low battery remaining capacity determination value with a predetermined remaining battery capacity determination value; and comparing the new remaining battery capacity with the comparing means. Battery capacity is low Alarm means for issuing a warning of a decrease in battery voltage when it is determined that the constant value has decreased.The apparatus is operated in a predetermined state, the number of times the load on the battery is increased, and the load on the battery is returned to a normal load. The power consumption of the battery corresponding to the number of times is subtracted from the preset remaining capacity of the currently used battery, a new remaining battery capacity is counted and compared with a preset battery remaining capacity determination value, and a new battery is used. It is determined whether the remaining capacity is lower than the battery remaining capacity determination value.

The voltage monitoring apparatus according to the present invention includes an energization time counting means for counting a normal energization time by the battery for maintaining the operation of the apparatus, and the battery remaining capacity counting means is counted by the energization time counting means. By subtracting the power consumption of the battery per normal power-on time from the remaining capacity of the currently used battery, the power consumption of the battery per normal power-on time in addition to the power consumption according to the fluctuation of the battery load can be calculated. From the remaining capacity.

The battery remaining capacity counting means of the voltage monitoring apparatus according to the present invention sets in advance the power consumed each time the load of the battery is increased and each time the load of the battery is returned to a normal load. By subtracting from the remaining capacity of the currently used battery and counting the new remaining capacity of the battery, the remaining battery capacity can be counted in real time every time the battery load changes.

The voltage monitoring apparatus according to the present invention sets the battery remaining capacity determination value in accordance with the battery usage environment or battery characteristics such as battery type and capacity, and sets the battery remaining capacity in the comparison means. The remaining battery capacity can be determined according to the actual use environment or battery characteristics.

[0013] The voltage monitoring apparatus according to the present invention can monitor the decreasing tendency of the remaining battery capacity by including the reading means for reading the new remaining battery capacity from the remaining battery capacity counting means.

A voltage monitoring device according to the present invention is characterized in that a battery voltage detecting means for detecting a battery voltage from a voltage drop between loads generated when a pseudo-resistive load provided in the device is energized by the battery, and the comparing means. Warning means for determining a decrease in battery voltage based on the remaining battery capacity determination result and the battery voltage detection result and issuing a warning, and comparing the actually measured battery voltage reduction determination result with the remaining battery capacity determination result. Thus, the correctness of each determination result can be verified.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment FIG. 2 is a schematic configuration diagram of a microcomputer (hereinafter, referred to as a microcomputer) for performing various processes related to detection of a remaining battery voltage according to the present invention. The microcomputer has a CPU 40a, a RAM 40b, and a ROM 40c as shown in FIG.
In addition to the OM 40c, a flow rate sensor FS for measuring the gas flow rate flowing through the gas flow path, a transistor Q1 for controlling the opening and closing of a cut-off valve (not shown) according to the flow rate measurement result,
Alarm means for issuing an alarm of a small remaining capacity based on the number of ON / OFF operations of No. 1, ie, the number of times the shut-off valve is shut off, the number of times of return from the shut-off, and the remaining battery capacity calculated from the transistor energizing time for maintaining the shut-off state 3 are connected.

The RAM 40b has a data area for storing various data and a work area used for various processing operations. The ROM 40c has various processings by the CPU 40a, such as flow rate calculation processing, shut-off valve control processing, and shut-off frequency calculation processing. In addition, a control program for performing an energization time calculation process and a return count calculation process is stored.

Next, an outline of the microcomputer processing will be described with reference to the flowchart shown in FIG. First, an initialization operation is performed together with the activation of the apparatus to initialize each work area and the like (step S1). A drive signal for turning on / off the transistor Q1 is read as an operation signal (step S2). At this time, in order to determine the shutoff operation of the shutoff valve from the contents of the operation signal, it is checked whether the drive signal is an H level signal or an L level signal (step S3). If the signal is an L level signal, 1 is added to the number of cutoffs to count the number of cutoffs (step S).
4).

Next, the input holding of the L level signal is checked. If the input is not held and the signal is inverted to the H level signal, it is determined that the cutoff operation has not been canceled (step S5), and the energizing time is determined. Is counted, and it is determined again whether the cutoff operation has been canceled after the counting. Unless the cutoff operation is canceled, the energization time is counted continuously (step S6). The energization time measured here is to maintain the operation of the device.
The energization performed on the device is counted periodically, and may be counted at any time after the initialization process in step S1.

In step S5, the drive signal is inverted to an L level signal, the interruption operation is released, and it is determined whether or not the operation has returned (step S7). If the signal is an L level signal, 1 is added to the number of times of return to count the number of times of return (step S4), and the operation signal is read again (step S4).
1).

FIG. 4 is a schematic configuration diagram of a voltage monitoring device 1A including a control unit Ca including the microcomputer 40 shown in FIG. In the figure, the same reference numerals as those in FIG. 12 indicate the same or corresponding parts. The control unit Ca stores in advance an electric power required for one shut-off and one return and the power consumed per unit time during normal energization in an internal memory in advance, and performs the shut-off operation and the return operation on / off of the transistor Q1. Judge from operation. If the drive signal of the transistor Q1 is at L level, 1 is added to the number of cutoffs, and if it is at H level, 1 is added to the number of resets.

Embodiment 1 Next, Embodiment 1 of the present invention
The operation of the control unit of the voltage monitoring device according to the first embodiment will be described with reference to FIG. FIG. 5 is a block diagram showing functions executed by the CPU by software. In the figure, 2A issues an alarm signal to the alarm means 3 according to the remaining battery level based on the counting result by the counting process shown in FIG.
The control means 4 forcibly controlling the shut-off valve V counts the number of times of return, and calculates the return-time power consumption for the count from the power consumption of the battery required for one return, and counts the return once. Each time the return count counter outputs the power consumption value of the battery required for one return, the counter counts the number of cutoffs, and the power consumption at the time of the cutoff is calculated from the power consumption of the battery required for one stop. The number-of-interruptions counter, which performs the integration operation and outputs the power consumption value of the battery required for one interruption each time the interruption is counted once, 6 counts the energization time throughout the normal operation time of the device, A power-on time counter 7 calculates the power consumption for the power-on time from the power consumed per unit time. A counter 7 stores the battery power stored in advance in each of the counters 4 to 6. Battery remaining capacity subtracted from capacity Counter, 8A compares the remaining free space increase warning judgment value stored in the warning judgment value storage means 9 and the subtraction value, the subtraction value is determined comparing means or falls below the residual capacity low warning judgment value.

In the above configuration, the cutoff frequency counter 5
Counts the number of cutoffs, calculates the integrated power consumption at the time of the cutoff from the power consumption of the battery required for one shutoff of the shutoff valve V, and calculates the power required for one cutoff each time the cutoff is counted once. The power consumption value of the battery is output to the remaining battery capacity counter 7. The battery remaining capacity counter 7 subtracts this value from the battery remaining capacity stored in advance each time a power consumption value of the battery required for one shut-down is input.

The return number counter 4 counts the number of return times,
From the power consumption of the battery required for one return of the shut-off valve V, the power consumption at the time of return for the count is integrated and calculated, and the power consumption value of the battery required for one return is calculated every time the return is counted. Output to the remaining capacity counter 7. The battery remaining capacity counter 7 subtracts this value from the battery remaining capacity stored in advance every time a power consumption value of the battery required for one return is input.

Further, the power-on time counter 6 counts the power-on time throughout the normal operation time of the apparatus, and outputs a count value to the battery remaining capacity counter 7 at regular intervals. Since the power consumed per unit time during normal energization is stored in the battery remaining capacity counter 7 in advance, the power consumption for a certain time is calculated from the input count value and the stored power consumption, and this power consumption is calculated. Subtraction is performed from the remaining battery capacity stored in advance.

The subtraction value of the remaining battery capacity calculated by the remaining battery capacity counter 7 is compared with the low remaining battery warning judgment value stored in the warning judgment value storage means 9 by the comparing means 8A, and the subtraction value is calculated. It is determined whether the value is below the warning determination value. At this time, if it is determined that the subtracted value of the remaining battery charge is smaller than the low remaining battery warning judgment value, the control means 2A is notified and a warning is displayed on the warning means that the remaining battery capacity is low, or the shutoff valve V is forcibly activated. Perform cutoff control.

Note that the remaining battery capacity counter 7 subtracts the power consumption value of the battery required for one shut-off and one return from the previously stored remaining battery capacity every time the shut-off and the return are performed. The number of times of return may be integrated for a predetermined number of times, and a reduction in the remaining battery capacity may be determined by subtracting the integrated power consumption value corresponding to the integrated value from the remaining battery capacity.

Embodiment 2 FIG. In the first embodiment, the remaining capacity low warning determination value stored in the warning determination value storage means 9 is fixed. However, when the operating environment of the gas meter is at a very low temperature and the operation assurance voltage cannot be secured as compared with the normal temperature, Alternatively, an optimum remaining capacity low warning determination value may be set according to the battery characteristics such as the type and capacity of the battery to be used.

FIG. 6 is a block diagram showing functions executed by software by the CPU according to the present embodiment. In the drawing, the same reference numerals as those in FIG. 5 indicate the same or corresponding parts. In the figure, reference numeral 8B denotes a comparison unit according to the present embodiment, and 10 denotes a warning determination value setting unit that sets a low remaining battery warning determination value according to conditions such as a battery usage environment, a battery type and a capacity.

The warning judgment value storage means 9 stores a low remaining capacity warning judgment value according to the above condition. The stored remaining capacity low warning determination value is compared with the subtracted value of the remaining battery capacity calculated by the remaining battery capacity counter 7 as in the first embodiment, and whether the subtracted value is smaller than the remaining capacity low warning determination value. Is determined.

Embodiment 3 In the first and second embodiments, the remaining capacity low warning determination value set in the comparing means 8A and 8B is compared with the subtraction value of the remaining battery capacity calculated by the remaining battery capacity counter 7, and the subtraction value is determined as the remaining capacity low. When it is determined that the value is below the warning determination value, an alarm is issued or the shut-off valve V is forcibly shut off. However, in the present embodiment, a subtraction value of the remaining battery capacity is read to check the remaining battery capacity. .

FIG. 7 is a block diagram showing each function implemented by software by the CPU according to the present embodiment. In the drawings, the same reference numerals as those in FIGS. 5 and 6 indicate the same or corresponding parts. In the figure, reference numeral 11 denotes reading means for reading the remaining battery capacity in the remaining battery capacity counter 7. By providing the reading means 11 in this manner, the remaining life of the battery is confirmed before the comparing means 8C determines that the remaining battery voltage is low so that the battery voltage becomes equal to or lower than the operation guarantee voltage,
You can decide when to replace the battery or device.

Embodiment 4 FIG. In the first to third embodiments, the number of times of return, the number of times of cutoff, and the number of times of energization are converted into power consumption,
This power consumption was subtracted from the remaining battery capacity set in the remaining battery capacity counter to determine the remaining battery capacity was low. However, if there is a measurement error in the number of times, even if the battery voltage actually drops, the battery remaining capacity is not determined and the shutoff of the shutoff valve is delayed.

[0033] The present embodiment is intermittently lithium battery B of the apparatus mounted through the switching transistor Q ₂ to the cutoff valve pseudo resistor R ₃ connected to the control unit Cb according to the present embodiment shown in FIG. 11 current And the number of resets, the result of detecting the voltage drop caused by flowing
The battery voltage drop is determined by a CPU (not shown) built in the control unit Cb, together with the remaining battery capacity determined based on the number of cutoffs and the number of energizations.

The respective functions implemented by software by a CPU (not shown) built in the control unit Cb according to the present embodiment are described in a block diagram of FIG. In FIG. 5, FIG.
The same reference numerals as those in FIG. 12 indicate the same or corresponding parts. In the figure, reference numeral 12 denotes a battery voltage detecting means based on a pseudo load (pseudo resistance of a shut-off valve), and reference numeral 13 issues a warning of battery exhaustion based on the remaining capacity of the battery determined by the comparing means 8D and the detected battery voltage by the battery voltage detecting means 12. Warning determination means for determining whether or not
Reference numeral 14 denotes a warning unit that issues a warning of running out of battery based on the result of the warning determination.

Next, the operation of this embodiment will be described. As shown in the flowchart of FIG.
3 fetches the comparison result from the comparison means 8D and checks the remaining battery charge (step S91). If the remaining battery capacity is not determined, it is determined that the device (gas meter) can operate normally, and the remaining battery capacity is monitored again.

[0036] However, if remaining battery low is determined, read the voltage drop generated from the battery voltage detector 12 across the dummy load R ₃ (step S92), determines whether the battery voltage drops (Step S93). If it is determined that the battery voltage has dropped, it is determined that the battery has reached the end of its life (step S94). As a result of the determination, the running out of the battery is warned through the warning means 14, and the shutoff valve V is forcibly shut off (step S96).

However, if the battery voltage drop is not determined in step S93 regardless of the detection of the low remaining battery capacity, it is determined that the battery life is short but there is room for operation of the apparatus (step S93).
95).

Further, as shown in the flowchart of FIG. 10, the warning judging means 13 determines whether or not the voltage drop generated from the battery voltage detector 12 across the dummy load R ₃ read the battery voltage has dropped (step S91A). If the battery voltage drop is not determined, use the device (gas meter)
Determines that it can operate normally, and monitors the battery voltage again.

However, if it is determined that the battery voltage has dropped, the comparison means 8D takes in the comparison result and checks the remaining battery capacity (step S92A). It is determined whether the remaining battery charge is smaller than a preset low battery remaining warning determination value (step S93A). If it is determined that the remaining battery charge is low, it is determined that the battery life is reached (step S94). As a result of the determination, the running out of the battery is warned through the warning means 14, and the shutoff valve V is forcibly shut off (step S96).

However, if it is not determined in step S93A that the remaining battery charge is low irrespective of the detection of the battery voltage drop, an abnormality of the apparatus (step S95A), for example, a measurement error of the number of times is determined.

In each of the above embodiments, the remaining battery capacity is determined based on the return count, the cutoff count, and the energization count, but the reference value is not limited thereto.
For example, when the flow rate measurement value is transmitted to the monitoring center or the like by the notification means, the number of notifications may be reflected in the power consumption of the battery and subtracted from the remaining battery capacity counter.

[0042]

As shown in the basic configuration diagram of FIG. 1, the voltage monitoring apparatus of the present invention has an operation signal input means for inputting an operation signal of an apparatus using a battery as a power supply, and a predetermined apparatus based on the operation signal. Operation number counting means for counting the number of times the battery load was increased and the number of times the battery load was restored to a normal load, and the number of times the battery load was increased and the number of times the battery load was restored were counted. Battery remaining capacity counting means for subtracting the power consumption of the battery from the preset remaining capacity of the currently used battery and counting a new remaining battery capacity; and the new remaining battery capacity and a predetermined battery remaining capacity determination value Comparing means for determining whether or not the new remaining battery capacity is lower than the small remaining battery capacity determination value. The comparing means determines that the new remaining battery capacity is smaller than the remaining battery capacity determination value. Battery voltage is low when it is determined to be low Alarm means for issuing an alarm of (i), the power consumption of the battery corresponding to the number of times the device has been operated in a predetermined state and the load of the battery has been increased, and the number of times the battery load has been returned to a normal load. Is subtracted from the preset remaining battery capacity of the currently used battery, a new remaining battery capacity is counted and compared with a preset remaining battery capacity low determination value, and the new remaining battery capacity is determined by the battery remaining capacity determination value. By determining whether or not the battery voltage has further decreased, there is an effect that the decrease in the battery voltage can be accurately monitored regardless of the battery voltage characteristic depending on the temperature.

The voltage monitoring apparatus according to the present invention includes an energization time counting means for counting a normal energization time by the battery for maintaining the operation of the apparatus, and the battery remaining capacity counting means is counted by the energization time counting means. By subtracting the power consumption of the battery per normal power-on time from the remaining capacity of the currently used battery, the power consumption of the battery per normal power-on time in addition to the power consumption according to the fluctuation of the battery load can be calculated. There is an effect that a drop in the battery voltage can be accurately monitored in consideration of the constant power consumption of the battery, which is subtracted from the remaining capacity of the battery.

The battery remaining capacity counting means of the voltage monitoring apparatus according to the present invention sets in advance the power consumed each time the load of the battery is increased and each time the load of the battery is returned to the normal load. By subtracting from the remaining battery capacity of the currently used battery and counting the new battery remaining capacity, the remaining battery capacity can be counted in real time for each change in battery load. There is an effect that a drop in battery voltage can be monitored accurately with time.

The voltage monitoring apparatus according to the present invention sets the battery remaining capacity judgment value in accordance with the operating environment of the battery or the battery characteristics such as the type and capacity of the battery, and sets the value in the comparing means, whereby Since the remaining battery capacity can be determined in accordance with the actual use environment or battery characteristics, there is an effect that the voltage drop can be monitored more accurately.

Since the voltage monitoring apparatus according to the present invention includes the reading means for reading out the remaining battery capacity from the remaining battery capacity counting means, it is possible to monitor the tendency of the remaining battery capacity to decrease. There is an effect that can be.

According to the present invention, the battery voltage detecting means for detecting the battery voltage from the voltage drop between the loads when the battery is energized to the pseudo-resistive load provided in the device, and the remaining battery capacity by the comparing means. Warning means for determining a drop in the battery voltage based on the determination result and the battery voltage detection result and issuing a warning, and comparing the actually measured battery voltage drop determination result with the remaining battery capacity determination result to perform each determination. Since the correctness of the result can be verified, the voltage monitoring accuracy is improved.

[Brief description of the drawings]

FIG. 1 is a basic configuration diagram of a voltage monitoring device according to the present invention.

FIG. 2 is a block diagram schematically showing an electrical configuration according to the voltage monitoring device of the present invention.

FIG. 3 is a flowchart illustrating a basic operation of the voltage monitoring device according to the present invention.

FIG. 4 is a diagram showing a schematic configuration when the voltage monitoring device of the present invention is applied to a gas meter.

FIG. 5 is a configuration diagram showing Embodiment 1 of the control unit shown in FIG. 4;

FIG. 6 is a configuration diagram showing a second embodiment of the control unit shown in FIG. 4;

FIG. 7 is a configuration diagram showing a third embodiment of the control unit shown in FIG. 4;

FIG. 8 is a configuration diagram showing a fourth embodiment of the control unit shown in FIG. 4;

FIG. 9 is a flowchart illustrating an operation of a warning determination unit in FIG. 8;

FIG. 10 is a flowchart illustrating an operation of a warning determination unit in FIG. 8;

FIG. 11 is a diagram illustrating a schematic configuration when a voltage monitoring device according to a fourth embodiment is applied to a gas meter.

FIG. 12 is a diagram showing a schematic configuration when a conventional voltage monitoring device is applied to a gas meter.

[Explanation of symbols]

 1A1 Operation signal input means 3 Warning means 4a Operation count counting means 6a Energization time counting means 7a Battery remaining capacity counting means 8 Comparison means

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02J 7/00 H02J 7/00 NX F term (Reference) 2F030 CB04 CC13 CF05 CF11 2G016 CB12 CC01 CC02 CC04 CC06 CC07 CC21 CC27 CC28 CD02 CD04 CD14 2G035 AA03 AA21 AB03 AD02 AD10 AD26 AD28 AD29 AD64 5G003 BA01 DA13 EA05 EA06 GC04 GC05 5H030 AS11 BB01 FF41 FF43 FF51

Claims (6)

[Claims] An operation signal input means for inputting an operation signal of an apparatus using a battery as a power supply, a number of times the apparatus is operated in a predetermined state based on the operation signal to increase the load of the battery, and a load of the battery Operation number counting means for counting the number of times the battery has returned to the normal load, and subtracting the power consumption of the battery corresponding to the number of times of battery load increase and the number of times of battery load return from the preset remaining capacity of the currently used battery, Battery remaining capacity counting means for counting the remaining battery capacity, comparing the new battery remaining capacity with a predetermined battery remaining capacity low determination value, and the new battery remaining capacity is smaller than the battery remaining capacity determination value. Comparing means for determining whether or not the battery level has decreased, and alarm means for issuing a battery voltage drop warning when the comparing means determines that the new battery remaining capacity has decreased the battery remaining capacity low determination value. Characterized by Voltage monitoring device. 2. A power supply time counting means for counting a normal power supply time by the battery for maintaining the operation of the apparatus, wherein the battery remaining capacity counting means is a battery per normal power supply time counted by the power supply time counting means. 2. The power consumption of the current battery is subtracted from the remaining capacity of the currently used battery.
3. The voltage monitoring device according to claim 1. 3. The battery remaining capacity counting means sets a power consumption of a currently used battery which is set in advance each time the load of the battery is increased and each time the load of the battery is returned to a normal load. 3. The voltage monitoring device according to claim 1, wherein the remaining battery capacity is counted by subtracting the remaining capacity from the capacity. 4. A battery remaining capacity low judgment value is set according to the battery usage environment or battery characteristics such as battery type and capacity,
The voltage monitoring device according to claim 1, wherein the voltage monitoring device is set in the comparison unit. 5. The voltage monitoring apparatus according to claim 1, further comprising a reading unit for reading a new remaining battery level from said remaining battery capacity counting unit. 6. A battery voltage detecting means for detecting a battery voltage from a load-to-load voltage drop when a pseudo-resistive load provided in the apparatus is energized by the battery, a battery capacity remaining determination result by the comparing means, 6. The voltage monitoring device according to claim 1, further comprising: a warning generating unit configured to determine a decrease in battery voltage based on a battery voltage detection result and issue a warning.