JP2730348B2 - Battery-powered electronic equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery-operated electronic device provided with an electromagnetic induction type driving means such as a motor driven by a battery or a data recording / reproducing means, and particularly to a warning display when the battery voltage drops. And stop control.

[0002]

2. Description of the Related Art In recent years, various electronic devices have been reduced in size and weight.
And various types of electronic equipment (e.g., cassette tape recorder, earphone stereo, camera, video camera, CD player, floppy disk) equipped with electromagnetic induction type driving means such as a motor driven by a battery as a power source. Portable PCs with disks, etc.)
Widely used.

[0003] In such electronic equipment, since the inserted battery has a limited life, the battery is consumed with use, the supply voltage is reduced, and the supply current is also reduced. Would. For this reason, it is necessary to replace or charge the battery (when using a rechargeable battery) before it becomes inoperable. Various techniques for generating the same have been developed and put to practical use.

For example, when the battery voltage falls below a predetermined voltage (set slightly higher than the minimum voltage necessary for normal operation of the device), this is detected and the display element is turned on and off to warn the user. What was made to do (56
JP-A-174064, JP-A-57-35676, etc.), or A / D conversion by detecting the battery voltage,
There is an example in which the remaining capacity or consumption level of the battery is displayed by using three or four display elements such as LEDs.

[0005]

However, in an electronic apparatus having an electromagnetic induction type driving means such as a motor driven by a battery, a large amount of power is consumed during operation.
Especially at the time of startup, since a large current flows temporarily,
Battery voltage (voltage between terminals of battery; supply voltage) decreases.
Therefore, the battery voltage fluctuates due to turning on / off of the motor or the like, and in the above-described conventional device, the display of the degree of battery consumption fluctuates depending on the operation state of the device, or a warning display of a low battery voltage appears or disappears. As a result, there is a problem that it is difficult for the user to determine when the battery needs to be replaced or charged.

Further, since the user wants to use the battery for as long as possible, even if a warning message is displayed or the consumption level display indicates the usage limit, the battery is not very reliable. They tended to suddenly become inoperable when it was important to keep using them.

Particularly, in a battery-powered electronic device provided with data recording / reproducing means such as a tape recorder, a video camera, and a portable personal computer with a floppy disk, data (in this specification, "data" refers to audio, video, etc. (Including various information) suddenly becomes unable to operate normally,
Not only was recording interrupted in the middle of a series of data, but there was also a risk that already recorded data would be destroyed or erased. Alternatively, there is also a risk that photographing or the like fails due to a stop in the middle of a series of operations, and the operation cannot be started immediately even after replacing the battery.

The present invention has been made in view of the above points, and in an electronic device having an electromagnetic induction type driving means such as a motor driven by a battery, a warning message prompting replacement or charging of a battery appears. Even if you keep using it only when it is running or when you operate a motor,
An object of the present invention is to be able to stop a series of operations and a minimum necessary process before a normal operation of the device becomes impossible.

It is another object of the present invention to accurately display the time when the battery needs to be replaced or charged without the warning display fluctuating depending on the operation state of the electronic device. Further, in the case of an electronic device having data recording / reproducing means, during data recording, the battery voltage is inadvertently dropped below a limit value at which a normal operation can be performed, recording is interrupted, or recorded data is lost. The purpose is to eliminate the risk of destruction or erasure.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a battery-operated electronic device having an electromagnetic induction type driving means such as a motor driven by a battery. A first voltage detecting means for detecting the following when the voltage becomes below, and a battery voltage during operation of the electromagnetic induction type driving means is monitored, and the battery voltage is lower than the first predetermined voltage, and the device operates normally. Voltage detecting means for detecting when the voltage becomes equal to or lower than a second predetermined voltage slightly higher than the lower limit of the possible voltage, display means for displaying a warning prompting replacement or charging of the battery, Voltage detection means and second
When any one of the voltage detecting means detects a drop in the battery voltage, the display means displays a warning, and when the second voltage detecting means detects the drop in the battery voltage, a required delay time is set. And control means for stopping the operation of the electromagnetic induction driving means.

[0011]

In each of the above battery-powered electronic devices, it is desirable to provide a means for holding a detection result when the second voltage detecting means detects a decrease in battery voltage. Further, the display means and the control means make the warning display mode different between when the first voltage detecting means detects a decrease in battery voltage and when the second voltage detecting means detects a decrease in battery voltage. Means may be provided.

The present invention is also directed to a battery-operated electronic device provided with an electromagnetic induction type driving means such as a motor driven by a battery and data recording / reproducing means, wherein the battery voltage is set at a first level.
First voltage detection that detects when the voltage drops below a constant voltage
And means, the electromagnetic induction type drive unit monitors the battery voltage during operation, the battery voltage is lower than the first predetermined voltage, normal operation voltage slightly higher second lower limit of the possible the instrument < a second voltage detecting means for detecting when the voltage becomes equal to or lower than a predetermined voltage; a display means for displaying a warning for prompting replacement or charging of the battery; the first voltage detecting means and the second voltage detecting means When any of the means detects a decrease in the battery voltage, the display means displays a warning and the second voltage
If the data recording / reproducing means is recording data when the detecting means detects a decrease in battery voltage, a control means for closing the recording file is also provided.

[0014]

Further, it is preferable that a means for stopping the operation of the electromagnetic induction type driving means after the control means closes the recording file and a means for continuing the warning display by the display means even after the operation is stopped are provided. desirable.

[0016]

The battery-operated electronic device according to the present invention configured as described above always detects when the battery voltage becomes equal to or lower than the first predetermined voltage. When the voltage falls below a second predetermined voltage, which is lower than the first predetermined voltage and slightly higher than the lower limit of the voltage at which the device can operate normally, it is detected. Is displayed. When the second voltage detecting means detects a decrease in the battery voltage, the operation of the electromagnetic induction driving means is stopped after a required delay time.

Therefore, a two-stage warning display is possible. Even if the warning display is issued when the electromagnetic induction driving means is not operating, if the battery voltage is lower than the second predetermined voltage when the electromagnetic induction driving means is operating. If not (this is the case if the battery capacity is large), the device continues to operate normally, and if the voltage falls below the second predetermined voltage, the operation of the electromagnetic induction type driving means is delayed after a required delay time. Since the operation is stopped, the delay time is set, for example, until the end of a series of operations and the minimum necessary processing is completed (until the film is wound up in the case of the camera, or the one cut is taken during the shooting of the video camera). The various inconveniences described above can be resolved by performing the recording until the recording data is interrupted until the recording data is interrupted (until the file is closed) until the recording is completed by the data recording device until the photographing is completed.

Further, when the power consumption is substantially zero or small, the battery voltage drop is monitored at the first predetermined voltage, and the second predetermined voltage (second power supply) is monitored while the electromagnetic induction driving means such as a motor is operating. If the battery voltage is monitored at a predetermined voltage of <2 <the first predetermined voltage) and a drop in the battery voltage is detected at any one of them, a warning display prompting replacement or charging of the battery is performed.
As long as the battery voltage is higher than the first predetermined voltage and the battery voltage does not fall below the second predetermined voltage even if the electromagnetic induction type driving means operates, no warning is displayed, and the user can feel safe. Continue to use.

Even if the battery voltage is lower than the first predetermined voltage and a warning message is displayed, if the battery voltage does not fall below the second predetermined voltage when the electromagnetic induction type driving means is operated. Since the warning message disappears, it can be understood that the battery can be used a little more even if the battery cannot be replaced or charged immediately. In a state where the battery voltage is always lower than or equal to the first predetermined voltage, and is reduced to be lower than or equal to the second predetermined voltage when the electromagnetic induction type driving means is activated, the warning display is continued without fluctuation depending on the operation state. The warning display can be surely displayed before the normal operation becomes impossible.

When the second voltage detecting means detects a drop in the battery voltage, the detection result is held,
When the battery voltage drops to or below the second predetermined voltage when the electromagnetic induction driving means is activated, and a warning is displayed once upon detecting the battery voltage, the battery is then driven by a decrease in the drive current of the electromagnetic induction driving means or stoppage of operation. Even if the voltage is restored, the warning display does not disappear and the electromagnetic induction driving means does not start again.

A warning display mode (display content, display color, etc.) is displayed when the first voltage detecting means detects a decrease in battery voltage and when the second voltage detecting means detects a decrease in battery voltage. Is different, the user can easily determine whether it is time to replace or charge the battery, but can still use it a little, or just before the limit.

Further, in the case of a device provided with data recording / reproducing means, when it is detected that the battery voltage has fallen below a predetermined voltage slightly higher than the lower limit of the voltage at which the device can operate normally, the replacement or charging of the battery is performed. A warning message prompting the user is displayed, and if the data recording / reproducing means is recording data, the recording file is closed, so that there is no possibility that already recorded data is destroyed or erased.

Also in this case, similarly to the above, if the battery voltage is constantly monitored at the first predetermined voltage, and a warning display based on the detection of a decrease in the battery voltage is also performed,
It is possible to notify the user of the battery replacement or charging time earlier. Furthermore, if the recording file is closed, the operation of the electromagnetic induction type driving means is stopped, and the warning display by the display means is continued even after the operation is stopped. It is possible to continue to promote battery replacement or charging.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. Here, a description will be given of an embodiment in which the present invention is applied to a MIDI data filer which is a kind of battery-powered electronic device having an electromagnetic induction type driving means such as a motor driven by a battery and a data recording / reproducing means.

The MIDI data filer is a MIDI (Musical Instrument Digital I / D) which is a data transfer standard determined for mutually transmitting performance information of a synthesizer, a rhythm machine, a sequencer, a computer and the like.
nterface) data to be recorded (stored) / reproduced (read), and connected to a sound source device or a sound system for performance. FIG. 1 is a block circuit diagram showing only a portion related to the present invention of the MIDI data filer of this embodiment.

In the figure, reference numeral 1 denotes a power supply circuit,
A DC input jack 2 for inserting a DC input plug from a C / DC adapter, an anode terminal 3a contacting the anode and a cathode terminal 3b contacting the cathode when a battery is loaded;
And a filter circuit 4 for removing noise and a power supply line 18.
A power switch 5 for turning on / off the power supply to various parts in the machine through the power supply, a regulator 6 for stabilizing the supply voltage irrespective of load fluctuation, and a diode 7 for backflow prevention.

Reference numeral 8 denotes a microcomputer for controlling the whole of the MIDI data filer, including a CPU 9 as a central processing unit, a ROM 10 as a program memory,
And a RAM 11 serving as a working memory, which are interconnected by a bus line 12. The MIDI data input / output interface to the microcomputer 8 is not shown.

Reference numeral 13 denotes various control switches for inputting respective operation signals to the microcomputer 8 via the bus line 12. The various control switches (keys) 13 include, for example, the following. REC (recording) MDR (reproduction of bulk data) SE
Q (automatic performance playback) JOB (edit) UTIL (data range setting for editing) PAUSE (pause) START / STOP (start / stop) CUROR (cursor) TEMPO (tempo during playback)

Reference numeral 14 denotes a floppy disk controller (hereinafter abbreviated as “FDC”), which is a bus line 12.
And a floppy disk driver (hereinafter "FDD") in accordance with the instruction.
) 15 and its motors 16 (M1, M2) to record (store) data on the floppy disk FD or to reproduce (read) data recorded thereon. Here, the reason why there are two motors 16, M1 and M2, is that a disk rotation (M1) and a header movement (M2) are required.

Reference numeral 17 denotes a display, which uses, for example, a liquid crystal character display. In addition to displaying guidance on operation procedures of the apparatus and displaying a mode state, a voltage detection circuit described later detects a drop in battery voltage. Under the control of the micro computer 8, a warning display prompting replacement or charging of the battery is also performed.

Reference numerals 20 and 21 denote first and second voltage detection circuits for detecting a decrease in battery voltage. First voltage detection circuit 2
0 is a reference power supply 23, a comparator 24 and a power supply circuit 1
Resistors R1 and R2 that divide input voltage (corresponding to battery voltage) Vb of regulator 6 when power switch is turned on.
Consists of two. The reference power supply 23 is, for example, one that divides the voltage Vb with a resistor and a zener diode and outputs a constant voltage from both ends of the zener diode, or a button battery or other means. In this example, 1.25 V is applied to one of the comparators 24. Apply to input terminal B.

The other input terminal A of the comparator 24 has a voltage Vc at a voltage dividing point of the voltage Vb by the resistors R1 and R2.
Is applied, the comparator 24 inverts the output signal BH from the high level "1" to the low level "0" when A <B, that is, when Vc <1.25 V when the voltages of both input terminals are A and B. Are input to the microcomputer 8 via the bus line 12. Note that an IC in which the reference power supply 23 and the comparator 24 are integrated into one chip
Are commercially available.

Here, assuming that the resistance values of the resistors R1 and R2 are R1 and R2, respectively, since Vc = Vb × R2 / (R1 + R2), Vb = Vc × (R1 + R2) / R2, and R1 = 10 KΩ, If R2 = 2.525 KΩ, then Vc
When = 1.25 V, Vb = 1.25 × (10 + 2.525) /2.525=6.2 (V). This is the first predetermined voltage VBH and the battery voltage VBH.
When b becomes lower than this voltage of 6.2 V, the first voltage detection circuit 20 detects this and changes the output signal BH from "1" to "0".

The second voltage detection circuit 21 includes a reference power supply 25
And resistors R3 and R4 for dividing the same voltage Vb as described above. The reference power supply 25 has the same configuration as the above-described reference power supply 23. In this example, 1.25 V is applied to one input terminal B of the comparator 26.

The other input terminal A of the comparator 26 has a voltage Vd at a voltage dividing point of the voltage Vb by the resistors R3 and R4.
Is applied, the comparator 26 inverts the output signal from high level “1” to low level “0” when A <B, that is, Vd <1.25 V, when the voltages of both input terminals are A and B, The signal is inverted by the inverter 27 and the latch flip-flop circuit (hereinafter referred to as “latch F
F ”).

Here, assuming that the resistance values of the resistors R3 and R4 are R3 and R4, respectively, since Vd = Vb × R4 / (R3 + R4), Vb = Vd × (R3 + R4) / R4, and R3 = 10KΩ If R4 = 3.197 KΩ, then Vd
When = 1.25 V, Vb = 1.25 × (10 + 3.197) /3.197=5.16 (V). This is the second predetermined voltage VBL, and the battery voltage VBL
b becomes lower than this voltage 5.16V, the second
The voltage detection circuit 21 detects the output signal and sets the output signal to “1”.
From "0" to "0".

The second predetermined voltage VBL = 5.16 V is
When the motor 16 and the FDD 15 are operated, the voltage is slightly higher than the lower limit of the voltage at which the MIDI data filer can operate normally, and the motor 16 and the like do not operate and the power consumption is almost zero or the power consumption is normal. The first predetermined voltage VBL = a voltage slightly higher than the lower limit of the possible voltage
It is set lower than 6.2V.

Then, when the second voltage detection circuit 21 detects that the battery voltage has dropped below the second predetermined voltage and makes the output signal "0", the output of the inverter 27 becomes "1".
At the rising timing, the latch FF 28 latches the output voltage + V of the regulator 6 and outputs the output signal BL.
(The inverted Q output) is changed from “1” to “0”, and the signal is input to the microcomputer 8 via the bus line 12.

That is, the inverter 27 and the latch FF 28 are means for holding the detection result when the second voltage detection circuit 21 detects a drop in the battery voltage.
The latch state by the latch FF 28 is cleared by a clear signal from the microcomputer 8 when the power switch 5 is turned on. Alternatively, a clear switch may be provided in the various control switches 13 so that the clear can be performed by operating the clear switch. In this way, once the latch is activated due to a decrease in the battery voltage, the power switch 5 is turned on again, or the clear switch is turned on.
Since the latch cannot be released except when the motor
Do not enter the mode to move.

The microcomputer 8 monitors the detection signal BH from the first voltage detection circuit 20 while the motor 16 is not driven, and detects the detection signal BL from the latch FF 28 while the motor 16 is driven. Is monitored, and when any one of them becomes "0", a warning display urging replacement of the battery (prompting charging when a secondary battery is used as a battery) is displayed on the display. As this warning display, for example, “! B
"attery Low".

The detection signal B from the latch FF 28
When data is recorded on the floppy disk FD by the FDD 15 when L becomes "0", control is performed to close the recording file immediately or after recording the input data at one end. That is, access to the floppy disk FD is prohibited.

FIG. 2 shows the battery voltage Vb and the first predetermined voltage VBH.
FIG. 5 is a diagram showing a relationship between a second predetermined voltage VBL and a second predetermined voltage VBL. When the power switch 5 is OFF, the power consumption is zero, and the battery voltage Vb is relatively high.
Is turned on, and power is supplied from the power supply circuit 1 to a circuit portion other than the electromagnetic induction driving means (including a solenoid, a plunger, and the like, if any) such as the motor 16, the power consumption is reduced, and Vb is turned on. Slightly decreases.

However, since the first predetermined voltage VBH is set slightly higher than the lower limit of the required voltage in this state, the voltage Vb does not normally fall below VBH, but the battery is consumed. Then, when the voltage Vb decreases and the power switch 5 is turned on, the voltage immediately drops to VBH or less and is detected by the first voltage detection circuit 20.

After turning on the power switch 5,
At time t2, recording or reproduction of MIDI data is started, and when the electromagnetic induction type driving means such as the motor 16 operates, a large starting current flows. Therefore, the voltage Vb temporarily recovers to a certain extent after a large drop. Even when this voltage drops the most, the second predetermined voltage VBL is set slightly higher than the lower limit value at which the device normally operates, so that the voltage Vb usually falls below VBL even when the motor 15 is started. However, when the battery is consumed, the voltage Vb becomes the second voltage when the motor 15 starts.
, And is detected by the second voltage detecting circuit 21.

Once the lowering of the battery voltage is detected by the second voltage detecting circuit 21, it is detected by the latch F
F28 is latched and held, and thereafter enters a steady operation state, the battery voltage recovers slightly, and the second predetermined voltage V
The warning does not disappear even if it exceeds BL.

When the electromagnetic induction type driving means such as the motor 15 is operated, the rate of decrease of the battery voltage increases as the battery capacity decreases, so that when the battery capacity is small, the battery voltage is lower than that of the first voltage detection circuit 20. First, the second voltage detection circuit detects the drop in the battery voltage. If the battery capacity is large, the first voltage detection circuit detects the drop in the battery voltage first. Become.

Next, the processing of the microcomputer 8 of FIG. 1 according to the present invention will be described with reference to the flowcharts of FIGS. FIG. 3A shows a main routine. When it is started, first, initial settings are made, then various switch processes, first battery voltage management process, and the like are performed.
The second battery voltage management process is sequentially executed, and the processes from various switch processes to the second battery voltage management process are repeatedly executed. Details of each of these subroutines will be described later.

FIG. 3B shows a timer interrupt routine, which looks at various flags, performs various job processing for executing the job if the flags are set, and thereafter sets a flag DSP-WAIT (various control). Switch 13
Displays a warning at the time of any on event "! Battery
"Low" is erased, and a flag for displaying again after one minute) is determined to be "1".

If it is not "1", the process returns to the main routine of (A) without doing anything. If it is "1", the timer count register T is incremented to determine whether or not T = 1 minute. Judgment, if it has not passed for one minute, it returns to the main lume-tin as it is, but after one minute, a warning display "! Battery Low" is displayed,
During this warning display, the flag DSP which becomes "1" is set to "1", the flag DSP-WAIT and the timer count register T are each cleared to "0", and the process returns to the main routine.

The subroutine for various switch processes is shown in FIG.
This is a routine for monitoring an ON event of each switch (key) of the various control switches 13 and performing necessary processing when any switch is turned ON.

As shown in FIG. 4, first, an ON event of a REC (recording) switch is checked, and if there is, a flag REC (a flag which becomes "1" in a recording mode) is inverted (REC ← 1-REC; If “0”, set it to “1”,
After "1" is set to "0"), when it becomes "1", the mode is set to the recording mode, and the recording preparation processing including the initial setting is performed. Then, the empty area is searched for and the start address of the area suitable for writing is designated, and the timer interrupt routine shown in FIG. Write in. Then, for example, start / stop switch O
When the REC flag becomes "0" at N or the like, the recording mode is released.

Next, processing relating to the warning display is executed. That is, the flag FBH indicating the read result of the detection signal BH of the first voltage detection circuit 20 shown in FIG. 1 is "0" or the detection signal of the second voltage detection circuit 21 (latched by the latch FF 28). It is determined whether the flag FBL indicating the reading result is “0” or not, and if either or both are “0” (detecting a decrease in battery voltage),
Remove the "! Battery Low" warning and set the flag DS
The P-WAIT is set to "1" and the flag DSP is set to "0".

After these processes are completed, or when the flags FBH and FBL are both "1", or when R
If there was no EC switch on event, then M
Check the DR switch ON event. And
If there is an ON event, the MDR flag is inverted, and if it becomes "1", the job is set to the bulk data playback mode and the job is processed. If it becomes "0", the bulk data playback mode is released. After that, the same processing as the processing related to the warning display described above is executed.

In the same manner, the on events of the switches (keys) of the various control switches 13 are sequentially checked, and if any, the processing is executed. When the check processing up to the last TEMPO switch is completed, FIG. The process returns to the main routine shown in FIG.

Next, in the first battery voltage management process, as shown in FIG. 5A, first, the flag FBH is set to "0" (first
The voltage detection circuit 20 detects whether the battery voltage has dropped) and returns to the main routine if it is not “0”, but if it is “0”, the flag DSP is set to “1”.
(Warning is being displayed). If it is “1”, the process returns to the main routine, but “0”
If so, “! Battery Low” is displayed and the flag DSP is displayed.
-WAIT is set to "0" and the flag DSP is set to "1".
Return to the main routine.

In the second battery voltage management process, as shown in FIG. 5B, first, it is determined whether or not the flag FBL is "0" (the second voltage detection circuit 21 detects a decrease in the battery voltage). And
If it is not "0", the process returns to the main routine.
Is "1"), and if not in the recording mode, it is next determined whether or not the motor is being driven.

If the motor is being driven, a motor stop instruction (set the motor drive flag M to "0") is issued, and the motor 16
To stop driving. Then, “! Battery Low” is displayed, the flag DSP-WAIT is set to “0”, and the flag D
SP is set to "1" and the process returns to the main routine.
If the motor is not being driven and DSP = 0, "! Batte
ry Low ”and set the flag DSP-WAIT to“ 0 ”.
Then, only the process of setting the flag DSP to “1” is performed,
Return to the main routine. At this time, if DSP = 0, the process returns to the main routine without doing anything.

On the other hand, if the recording mode is set when the flag FBL is "0", the file is closed and the file is closed.
The flag REC is set to “0”. Although the closing process of the file may be performed immediately, it is desirable to perform the closing process after recording the input data being recorded until one end.

For example, CLOSE in FIG.
The processing shown in FIG. 6 may be inserted before the processing. That is, whether or not rest data or a substitute state (a state in which various data are not received for a while after the key-off data) continues is searched as data at all, and if the above state continues for a while, it is regarded that one segment data exists, and the next processing is performed. May be shifted to the CLOSE process. After that, a motor stop instruction is issued to stop driving the motor 16, and "!"
"Battery Low" is displayed, the flag DSP-WAIT is set to "0", the flag DSP is set to "1", and the process returns to the main routine.

According to this embodiment, when the flag FBH is set to "0" in the first battery voltage management process, a warning is displayed at any time. Is activated, the battery voltage decreases due to an increase in power consumption and falls below the first predetermined voltage VBH (6.2 V), and a warning is displayed. In this way, a warning is displayed only when the motor 16 is operating. In normal operation, it still works normally.

When a warning message is displayed even when the motor 16 is not operating, it is understood that the battery must be replaced or charged immediately. Still, when the motor is started, the battery voltage becomes equal to the second predetermined voltage VBL (5.
16V) or less, but normal operation is still possible at the time of detection. In this case, the file on the floppy disk FD is closed and the motor 16 is stopped (after a delay time). Therefore, there is no possibility that already recorded data is destroyed or erased. At this time, as described with reference to FIG. 6, if the input data being recorded is recorded until it is separated by one period and then the closing process is performed, the recording may be interrupted in the middle of continuous data. Disappears.

When the battery capacity is small, when the motor 16 is started, even if the battery voltage is higher than the first predetermined voltage VBH and the warning is not displayed when the motor 16 is not operating, when the motor 16 is started, the voltage becomes lower than the second predetermined voltage VBL. As a result, the file may be closed, the motor may be stopped, and a warning message may be displayed. In such a case, the detection result of the second voltage detection circuit 21 is latched and held by the latch FF 28. Stopping does not release the file from being closed, nor does the warning disappear.

When the first voltage detection circuit 20 detects a decrease in the battery voltage (when FBH = 0) and when the second voltage detection circuit 21 detects a decrease in the battery voltage (FBL = 0)
If the mode of the warning display (display content, display color, etc.) is different from the above, the user can easily determine whether the battery replacement or charging time has come, but it is still possible to use the battery a little, or just before the limit. Can be determined.

For example, in the former case, "! Battery Low
"Is displayed statically or a yellow LED is lit, and in the latter case,"! Battery Low "is displayed blinking or"! Battery Change "is displayed statically or blinking, or a red LED is lit (continuously or flashing). And
When both are detected, the latter display mode, etc.
Warning indications can be made in various ways.

Further, if the first battery management process is changed as shown in FIG. 7, even if the battery voltage drops below the first predetermined voltage VBH and the flag FBH becomes "0", the motor 1
Unless the electromagnetic induction type driving means such as 6 is not operating and the power consumption is substantially zero or small, a warning display or the like can be prevented from being performed. According to this configuration, when the battery voltage is higher than the first predetermined voltage VBH and does not become lower than the second predetermined voltage VBL even when the electromagnetic induction driving means such as the motor 16 is activated, No warning is displayed regardless of the operating status of the device.
The user can use the device with peace of mind.

In this embodiment, when it is detected that the battery voltage has dropped below the second predetermined voltage in both the recording (REC) mode and the reproduction mode, the mode is stopped and the motor is stopped. In other than the recording mode, the data recorded on the floppy disk does not disappear. Therefore, in the reproduction mode, the motor may be continuously operated to continue the reproduction mode, and only the warning display may be performed. Also in this case, since the regulator 6 can continue to supply a constant voltage to the system, it is needless to say that the rotation of the motor 16 does not occur.

In this embodiment, even if the battery voltage is lower than the first predetermined voltage and a warning is displayed, the battery voltage drops to the second predetermined voltage or less when the motor is started in the recording mode. If not (this occurs when a large capacity battery is used), the normal operation is performed, and the file is closed only when the voltage falls below the second predetermined voltage. The file may be closed even when the voltage becomes equal to or lower than the predetermined voltage of 1.

Further, the present invention is not limited to the MIDI data filer, and can be applied to various electronic devices using a battery as a power source. Even in an electronic device without a data recording means, the battery voltage drops to a second predetermined voltage or less. There is a required delay time between the detection of the operation and the stop of the operation of the electromagnetic induction type driving means such as a motor, during which a series of operations can be completed or a minimum of Processing can be completed.

[0069]

As described above, according to the present invention, in an electronic apparatus having an electromagnetic induction type driving means such as a motor driven by a battery, a warning message prompting replacement or charging of a battery appears. If you continue to use the machine only when it is running or when the motor etc. is activated, stop the operation after separating a series of operations and performing the minimum necessary processing before the equipment can not operate normally Therefore, the inconvenience of stopping in the middle of a series of operations or stopping recording in the middle of a series of data can be solved.

Further, it is possible to accurately display the time when the battery needs to be replaced or charged without the warning display fluctuating depending on the operation state of the electronic device. Further, in the case of an electronic device having data recording / reproducing means, during data recording, the battery voltage is inadvertently dropped below a limit value at which a normal operation can be performed, recording is interrupted, or recorded data is lost. The possibility of destruction or erasure can also be eliminated.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram showing only a portion related to the present invention of a MIDI data filer showing one embodiment of the present invention.

FIG. 2 is a diagram showing a relationship between a battery voltage Vb, a first predetermined voltage VBH, and a second predetermined voltage VBL. .

FIG. 3 is a flowchart of a main routine and a timer interrupt routine of a process according to the present invention by the microcomputer 8 of FIG. 1;

FIG. 4 is a flowchart of a subroutine of various switch processes.

FIG. 5 is a flowchart of the first battery voltage management process and the second battery voltage management process.

FIG. 6 is a partial flowchart of a process that can be inserted before a CLOSE process in the second battery voltage management process.

FIG. 7 is a flowchart showing an example in which the first battery voltage management process is partially changed.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Power circuit, 2 ... DC input jack, 3a ... Anode terminal, 3b ... Cathode terminal, 5 ... Power switch, 6 ... Regulator, 8 ... Microcomputer, 13 ... Various control switches, 14 ... Floppy disk controller (FD)
C), 15: floppy disk driver (FDD),
Reference numeral 16: FDD motor (electromagnetic induction driving means) 17: display, 20: first voltage detection circuit, 21: second voltage detection circuit, 23, 25: reference power supply, 24, 26: comparator, 27 ... Inverter, 28: latch flip-flop circuit, FD: floppy disk, R1 to R4: resistors for voltage division

Claims (5)

(57) [Claims] 1. A battery-powered electronic device provided with an electromagnetic induction type driving means such as a motor driven by a battery, wherein a first voltage detecting means for detecting when a battery voltage falls below a first predetermined voltage. And monitoring the battery voltage during operation of the electromagnetic induction driving means,
A second voltage detecting means for detecting when the battery voltage is lower than a second predetermined voltage slightly lower than the first predetermined voltage and slightly higher than a lower limit of a voltage at which the device can normally operate; Display means for performing a warning display for prompting replacement or charging of the battery; and causing the display means to perform a warning display when one of the first voltage detecting means and the second voltage detecting means detects a decrease in battery voltage. And a control means for stopping the operation of the electromagnetic induction driving means after a required delay time when the second voltage detection means detects a decrease in battery voltage. . 2. The battery-powered electronic device according to claim 1, further comprising means for holding a detection result when the second voltage detection means detects a drop in battery voltage. . 3. The method of claim 1 or 2 battery-powered electronic device, wherein said display means and control means, said first voltage detecting means and when detects a decrease in battery voltage second voltage detection means A battery-powered electronic device, comprising: means for making a warning display mode different from when a decrease in battery voltage is detected. 4. A battery-operated electronic device comprising an electromagnetic induction type driving means such as a motor driven by a battery and a data recording / reproducing means for detecting when the battery voltage falls below a first predetermined voltage. First voltage detecting means, and monitoring the battery voltage while the electromagnetic induction driving means is operating,
A second voltage detecting means for detecting when the battery voltage is lower than a second predetermined voltage slightly lower than the first predetermined voltage and slightly higher than a lower limit of a voltage at which the device can normally operate; Display means for performing a warning display for prompting replacement or charging of the battery; and causing the display means to perform a warning display when one of the first voltage detecting means and the second voltage detecting means detects a decrease in battery voltage. And a control means for closing the recording file if the data recording / reproducing means is recording data when the second voltage detecting means detects a decrease in battery voltage. 5. The battery-powered electronic device according to claim 4 , wherein said control means closes a recording file and stops operation of said electromagnetic induction type driving means, and said display means keeps operating after said operation stop. A battery-operated electronic device comprising: means for continuing a warning display.