JP4917702B1 - Battery level detection method, battery level detection device, and audio signal reproduction device - Google Patents

Abstract

It is an object of the present invention to provide a battery remaining amount detection method, a battery remaining amount detection device, and an audio signal reproduction device that can detect the remaining amount of storage of a battery with high accuracy.
As a means for solving this problem, the battery remaining amount detection method of the present invention uses a battery as a power source, a load driving step of driving an acoustic load by supplying an acoustic signal for a predetermined time, and a voltage of the battery by driving the acoustic load. A voltage drop measuring step for measuring a drop, and a remaining amount detecting step for detecting the remaining amount of storage of the battery based on the measured voltage drop.
[Selection] Figure 1

Description

  The present invention relates to a remaining battery level detection method, a remaining battery level detection apparatus, and an audio signal reproduction apparatus that detect a remaining battery charge level.

  As a conventional battery remaining amount detection device (method) of this type, a device applied to a dry cell pass / fail checker is known. This battery remaining amount detection device is connected to a dry battery as a detection target in parallel with a miniature bulb as a load resistance, and a timer circuit connected in series, and both terminals of the dry battery for about 1 second by a pulse voltage measurement circuit. Measure the voltage between. The measured voltage value is temporarily stored in the storage circuit, and the stored content is displayed on the display unit.

Japanese Utility Model Publication No. 62-24373

By the way, in a dry battery or the like, the internal resistance increases due to use, and the voltage drop at the actual load becomes remarkable due to the voltage drop due to the internal resistance. For this reason, it is known that the output voltage does not decrease much in the case of a light load even if the remaining amount of power storage is reduced to an extent that cannot be practically used.
In the conventional battery remaining amount detection apparatus (method), since a miniature light bulb is used as a load, it can be easily determined whether or not the battery to be inspected can withstand practical use. However, batteries for practical use have various objects to be supplied with power, and there is a problem that the remaining battery level cannot be detected accurately even if a pseudo load (bean bulb) is used as a load. In particular, in a small audio signal reproducing device or the like, when the remaining battery level cannot be detected with high accuracy, a problem such as the music being terminated halfway occurs.

  An object of the present invention is to provide a battery remaining amount detection method, a battery remaining amount detection device, and an audio signal reproduction device that detect the remaining amount of storage of a battery that can accurately detect the remaining amount of storage.

The battery remaining amount detection method of the present invention uses a battery as a power source, a load driving step of driving an acoustic load by supplying an acoustic signal for a predetermined time, and a voltage drop measuring step of measuring a voltage drop of the battery due to the driving of the acoustic load. And a remaining amount detecting step for detecting the remaining amount of electricity stored in the battery based on the measured voltage drop , wherein the acoustic signal is a signal in a non-audible frequency band .

A battery remaining amount detection device according to the present invention includes a load driving unit that supplies electric power from a battery for a predetermined time and drives an acoustic load based on an acoustic signal, and a voltage drop measuring unit that measures a voltage drop of the battery due to the driving of the acoustic load. And a remaining amount detecting means for detecting the remaining amount of electricity stored in the battery based on the measured voltage drop , wherein the acoustic signal is a signal in a non-audible frequency band .

According to these configurations, since the voltage drop of the battery due to the driving of the acoustic load is measured and the remaining battery charge level is detected based on the measurement result, the remaining battery charge level (battery charge level) ) Can be detected with high accuracy.
Moreover, although an acoustic load is driven to detect the remaining battery level, the remaining battery level can be detected without noise and noise because it is not captured as sound by the human ear.

  In the above battery remaining amount detection method, the acoustic signal is preferably a sine wave signal.

  In the above battery remaining amount detection device, the acoustic signal is preferably a sine wave signal.

  According to these configurations, a necessary acoustic signal can be easily generated and stored.

  In the above battery remaining amount detection method, the acoustic load is preferably a speaker.

  In the above battery remaining amount detection device, the acoustic load is preferably a speaker.

  According to these configurations, it is possible to drive a typical acoustic load by using the speaker, and it is possible to detect the remaining battery level with a load corresponding to the actual use load.

  An audio signal reproduction device according to the present invention includes the above-described battery remaining amount detection device.

  According to this configuration, since the voltage value (voltage drop) is measured using an actual load such as an acoustic load instead of a pseudo load, the remaining battery level is accurately detected according to the acoustic load. be able to. Therefore, it can be accurately determined whether or not the battery can withstand use.

1 is a block diagram of an audio signal reproduction device according to an embodiment of the present invention. It is explanatory drawing showing the display form of the battery remaining charge.

  Hereinafter, an audio signal reproducing apparatus to which a remaining battery level detection method and a remaining battery level detection apparatus of the present invention are applied will be described with reference to the accompanying drawings. This audio signal reproduction device is a small audio device that is mainly driven by a dry battery, and is configured to include a remaining battery level detection device that detects the remaining battery level of a dry battery to be used.

  As shown in FIG. 1, the audio signal reproducing apparatus 1 includes a dry battery (battery) 11, a power supply circuit 12, an A / D converter 13, a memory 14, a CPU (Central Processing Unit) 15, an operation unit 21, a display unit 22, and an audio. A decoder 23, an audio amplifier 24, and a speaker 25 (sound load) are provided. Among these, the dry battery 11, the power supply circuit 12, the A / D converter 13, the memory 14, and the CPU 15 constitute the battery remaining amount detection device 10.

  The operation unit 21 includes buttons, switches, and the like, and is used to perform various audio operations (playback, pause, fast forward / rewind, etc.), power on instruction, and battery remaining amount measurement instruction. The display unit 22 includes a liquid crystal display, an EL display, and the like, and displays various types of information such as a remaining amount display (see FIG. 2) indicating the remaining battery level. In the present embodiment, when a power-on instruction or a battery remaining amount measurement instruction is given by the operation unit 21, information indicating the remaining battery amount is displayed. The audio decoder 23 decodes the music data read from the memory 14 and outputs it to the audio amplifier 24. The speaker 25 outputs the audio signal amplified by the audio amplifier 24 to the outside. The number of speakers 25 may be one, or a plurality of speakers (for high sound range, medium sound range, low sound range, etc.). The audio amplifier 24 and the speaker 25 may be separate devices. In this case, the apparatus main body and the separate apparatus of the audio signal reproduction apparatus 1 may be wired connection or wireless connection.

  As the dry battery 11, any of a manganese battery, an alkaline battery, or a nickel metal hydride battery is used. The power supply circuit 12 inputs power supplied from the dry battery 11 and outputs power to each unit in the audio signal reproduction device 1. The A / D converter 13 detects the voltage of the dry battery 11 on the upstream side of the power supply circuit 12, A / D converts the detection result, and outputs the result to the CPU 15.

  The memory 14 is a non-volatile storage device such as a flash memory, a music file storage area 14a for storing music files, and a sine wave signal (acoustic signal, hereinafter referred to as “measurement sine wave”) for measuring the remaining battery level. And a sine wave storage area 14b for measurement. The music file storage area 14a stores music data (audio waveform signals) and music information (metadata added to music data, music analysis data, etc.). The measurement sine wave storage area 14b stores a frequency signal outside the audible band (for example, 20 KHz or more) as the measurement sine wave. In this way, a more accurate measurement value can be obtained by measuring the remaining battery level using a high frequency signal with a high load. Note that the Sin wave for measurement may be stored in the music file storage area 14a as one piece of music data.

  The CPU 15 controls each unit in the audio signal reproduction device 1 such as audio control for the audio decoder 23 and display control for the display unit 22. Moreover, it functions as the load driving means 15a, the voltage drop measuring means 15b, and the remaining amount detecting means 15c.

  The load driving unit 15a drives the audio amplifier 24 and the speaker 25 by supplying the measurement Sin wave read from the measurement Sin wave storage area 14b to the audio decoder 23 for a predetermined time (about several seconds). Note that the load driving unit 15a starts supplying the measurement Sin wave with the operation by the operation unit 21 as a trigger.

  The voltage drop measuring unit 15 measures the voltage drop of the dry battery 11 by the drive control of the load driving unit 15a. More specifically, the voltage value while the voltage Sink is supplied by the load driving means 15a for a predetermined time and the audio amplifier 24 and the speaker 25 are driven is reduced to the A / D converter 13. Get from. Based on the voltage drop measured by the voltage drop measuring unit 15 (voltage value during load driving by the load driving unit 15a), the remaining amount detecting unit 15c detects the remaining amount of charge in the dry battery 11. Note that a known algorithm can be applied as a calculation algorithm for obtaining the remaining power amount from the detected voltage value. Further, the remaining amount of electricity stored may be obtained by referring to a table in which the relationship between the voltage value and the remaining amount of electricity stored is correlated one-on-one.

  Next, with reference to FIG. 2, the remaining amount display of the display unit 22 controlled by the CPU 15 will be described. For example, as shown in FIG. 2A, the battery remaining amount display on the display unit 22 displays the dry battery 11 in the shape of a horizontally placed bottle 50, and a plurality of bottles 50 (the one shown in the figure is shown). 3), and the remaining charge amount is displayed by sequentially erasing and displaying the plurality of lateral charge portions 51.

Similarly, in the case of FIG. 2 (b), the storage amount is displayed by a plurality of (two in the figure) hatched lines 52 displayed in the horizontally placed bottle 50, and the plurality of hatched lines 52 are sequentially deleted. By displaying, the remaining amount of power storage is displayed.
Further, in the case of FIG. 2 (c), the storage amount is displayed by a plurality of (three in the drawing) vertical charging portions 53 displayed in a compartment in the vertically placed bottle 50, and the plurality of vertical charging portions. The remaining amount of electricity stored is displayed by sequentially deleting 53.

  As described above, according to the present embodiment, the audio amplifier 24 and the speaker 25 are driven for a predetermined time, the voltage drop of the dry battery 11 is measured, and the remaining charge of the dry battery 11 is detected based on the measurement result. As a result, the remaining power level (remaining battery level) of the dry battery 11 can be accurately detected. That is, since the battery remaining amount of the dry battery 11 is detected based on the actual use load, it can be easily and reliably determined whether or not the dry battery 11 constituting the power source can withstand practical use.

DESCRIPTION OF SYMBOLS 1 Audio reproduction apparatus 10 Battery remaining charge detection apparatus 11 Dry battery 13 A / D converter 14 Memory 14b Sin wave for measurement 15 CPU 15a Load drive means 15b Voltage drop measurement means 15c Remaining quantity detection means 21 Operation part 22 Display part 23 Audio decoder 24 Audio amplifier 25 Speaker

Claims (7)

A load driving step of driving an acoustic load by supplying an acoustic signal for a predetermined time using a battery as a power source;
A voltage drop measuring step of measuring a voltage drop of the battery due to driving of the acoustic load;
A remaining amount detecting step for detecting a remaining amount of electricity stored in the battery based on the measured voltage drop, and
The method of detecting a remaining battery capacity , wherein the acoustic signal is a signal in an inaudible frequency band . The method of claim 1 , wherein the acoustic signal is a sine wave signal. The method of claim 1 , wherein the acoustic load is a speaker. Load driving means for supplying power from the battery for a predetermined time and driving an acoustic load based on an acoustic signal;
Voltage drop measuring means for measuring a voltage drop of the battery due to driving of the acoustic load;
A remaining amount detecting means for detecting a remaining amount of electricity stored in the battery based on the measured voltage drop, and
The battery remaining amount detection device , wherein the acoustic signal is a signal in an inaudible frequency band . The battery remaining amount detection device according to claim 4 , wherein the acoustic signal is a sine wave signal. The battery residual quantity detection device according to claim 4 , wherein the acoustic load is a speaker. An audio signal reproducing device comprising the battery remaining amount detecting device according to claim 4 .

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