JP2006029815A - Remaining battery capacity detecting apparatus, its method, and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a remaining battery capacity detecting apparatus of a simple constitution accurately detecting a remaining battery capacity at all times, and also to provide its method and an electronic apparatus. <P>SOLUTION: In the remaining battery capacity detecting apparatus for detecting a remaining battery capacity, its method, and the electronic apparatus, an electric power consumption of a battery per unit of time is detected on the basis of an accumulated voltage and a discharge current of the battery. The remaining battery capacity of the battery is computed through the use of the detected electric power consumption of the battery per unit of time as a parameter and a relational expression with the battery acquired in accordance with results of experiments in which constant power discharges is conducted on a prescribed battery at a plurality of levels. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a remaining battery level detection apparatus and method, and an electronic apparatus, and is suitable for application to, for example, a portable MD (Mini Disc) player.

  Conventionally, in this type of portable MD player, a rechargeable battery that is detachably mounted is used as a current supply source when being carried, while a household power supply is used as a current supply source in an indoor environment such as a home. Generally, it is designed to be used through a predetermined AC (Alternating Current) adapter.

  Normally, in such an MD player, the remaining capacity or remaining time of the secondary battery determined from the battery voltage is constantly detected while detecting the voltage (that is, the battery voltage) accumulated in the loaded secondary battery. A battery mark is displayed on a display screen of a liquid crystal display unit provided in the remote control unit.

In such an MD player, when detecting the battery voltage of the secondary battery, how much is charged based on the amount of change in the charging current while detecting the charging current of the secondary battery during charging. On the other hand, during use, the discharge current of the secondary battery is accumulated based on the difference from the full charge amount while being accumulated over time (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 2002-199052

  By the way, in the actual secondary battery, there is no linear relationship between the remaining capacity and the battery voltage, and the discharge curve obtained from the relational expression of the voltage value and the discharge time is not the same depending on the discharge amount from the secondary battery. For this reason, when a secondary battery having different charge capacities during charging and use is loaded, it is very difficult to accurately display the remaining capacity or remaining time of the secondary battery.

  Further, in an MD player loaded with a secondary battery, when switching between an operation with a large load and an operation with a small load inside the device according to the user's selection, the unit per unit time of the secondary battery before and after the switching of the operation. Since the power consumption changes, there is a problem that it is very difficult to accurately determine the available time of the current operation when continuing the operation with different loads.

  One way to solve these problems is to use a so-called info lithium battery as a secondary battery, while constantly monitoring the charged and discharged electric capacity with a built-in microcomputer. A method has been proposed in which the remaining capacity or remaining time is determined from the power consumption of the device and displayed.

  However, the infolithium battery has a problem that the configuration becomes complicated and the entire apparatus becomes large because a microcomputer for monitoring charge / discharge must be mounted inside the battery.

  The present invention has been made in view of the above points, and an object of the present invention is to propose a remaining battery level detection device, a method thereof, and an electronic device that can always accurately detect the remaining battery level with a simple configuration.

  In order to solve such a problem, in the present invention, in a battery remaining amount detection device for detecting the remaining capacity of a battery, the power consumption for detecting the power consumption per unit time of the battery based on the accumulated voltage and discharge current of the battery The detection means and the remaining capacity of the battery can be obtained based on the experimental results of discharging a predetermined battery at a plurality of levels with the power consumption per unit time detected by the power consumption calculation means as a parameter. Remaining capacity calculating means for calculating using a relational expression with the battery storage voltage is provided.

  As a result, the remaining battery level detection device can accurately detect the remaining capacity of the battery even when the loaded battery is replaced with a different battery at the time of detection.

  In the present invention, in the battery remaining amount detection method for detecting the remaining capacity of the battery, the remaining capacity of the battery is determined after detecting the power consumption per unit time of the battery based on the accumulated voltage and discharge current of the battery. The calculation is performed using the relational expression with the accumulated voltage of the battery obtained based on the experimental result of discharging the predetermined battery at a plurality of levels with constant power consumption, using the detected power consumption per unit time as a parameter. I made it.

  As a result, in this battery remaining amount detection method, even when the loaded battery is replaced with a different battery at the time of detection, the remaining capacity of the battery can be accurately detected.

  Furthermore, in the present invention, in an electronic device that executes various processing operations using a battery, based on the storage voltage and discharge current of the battery, power consumption detection means that detects the power consumption per unit time of the battery, The battery's accumulated voltage is obtained based on the results of experiments in which a predetermined battery is discharged at multiple levels with the power consumption per unit time detected by the power consumption calculation means as a parameter. And a display unit for displaying the remaining capacity of the battery calculated by the remaining capacity calculating unit.

  As a result, in this electronic apparatus, even when the loaded battery is replaced with a different battery at the time of detection, the remaining capacity of the battery can be accurately detected and displayed on the display means.

  As described above, according to the present invention, in the battery remaining amount detection device for detecting the remaining capacity of the battery, the power consumption detection for detecting the power consumption per unit time of the battery based on the accumulated voltage and the discharge current of the battery. And a battery obtained by complying with a result of an experiment in which a predetermined battery is discharged at a plurality of levels with a power consumption per unit time detected by the power consumption calculation means as a parameter. By providing a remaining capacity calculating means for calculating using a relational expression with the stored voltage of the battery, even when the loaded battery is replaced with a different battery at the time of detection, the remaining capacity of the battery is accurately detected. Thus, it is possible to realize a battery remaining amount detecting device that can always detect the remaining battery amount accurately with a simple configuration.

  According to the present invention, in the battery remaining capacity detecting method for detecting the remaining capacity of the battery, the remaining capacity of the battery is detected after detecting the power consumption per unit time of the battery based on the accumulated voltage and discharge current of the battery. Is calculated using a relational expression with the accumulated voltage of the battery obtained based on the experimental result of discharging a predetermined battery at a plurality of levels at a constant power, using the detected power consumption per unit time as a parameter. As a result, even if the battery installed is replaced with a different battery at the time of detection, the remaining capacity of the battery can be detected accurately, and thus the remaining battery capacity is always accurately detected with a simple configuration. The remaining battery level detection method can be realized.

  Furthermore, according to the present invention, in an electronic device that executes various processing operations using a battery, the power consumption detecting means detects the power consumption per unit time of the battery based on the accumulated voltage and discharge current of the battery. Battery accumulation obtained based on the results of experiments in which a predetermined battery is discharged at a plurality of levels with constant power consumption, with the remaining battery capacity as a parameter, the battery power consumption detected by the power consumption calculation means Batteries with different installed batteries are detected by providing remaining capacity calculating means for calculating using a relational expression with voltage and display means for displaying the remaining capacity of the battery calculated by the remaining capacity calculating means. Even when the battery is replaced, the remaining capacity of the battery can be accurately detected and displayed on the display means, and thus the remaining battery capacity is always accurately detected with a simple configuration. Get electronic devices can be realized.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

(1) Configuration of magneto-optical disk recording / reproducing apparatus according to the present embodiment In FIG. 1, reference numeral 1 denotes the magneto-optical disk recording / reproducing apparatus according to the present embodiment as a whole, and an externally supplied audio signal S1 is represented by MD (Mini The audio signal S2 recorded on or reproduced from the magneto-optical disk 2 such as (Disc) can be output to the outside.

  That is, in the magneto-optical disk recording / reproducing apparatus 1, when the recording mode is selected in accordance with the operation of the operation unit 3 by the user, the system controller 4 that controls the entire apparatus has the audio signal S1 sequentially supplied from the outside. Is input to the audio encoder 6 through the input terminal 5 and subjected to a predetermined encoding process, and the obtained encoded audio data D1 is sent to the memory controller 7.

  The memory controller 7 sends the encoded audio data D1 to the error correction encoder / decoder 8 while using the memory 7A as a buffer as necessary. For example, the memory controller 7 has a predetermined unit for each sector (2 [kbyte] unit). After the error correction code is added, it is sent to the subsequent data modulator / demodulator 9 to perform EFM (Eight to Fourteen Modulation) modulation processing, and the recording data D2 thus obtained is sent to the optical pickup 10 and the magnetic field modulation driver 11.

  The optical pickup 10 includes optical system devices such as a laser diode, a collimator lens, an objective lens and a light receiving element, and an electrical system device such as a laser diode driver, and a light beam modulated in accordance with supplied recording data D2. The recording surface of the magneto-optical disk 2 is irradiated.

  At this time, the optical pickup 10 generates a servo error signal S3 such as a tracking error signal and a focus error signal and a push-pull signal S4 based on the reflected light from the magneto-optical disk 2, and outputs these signals S3 and S4. The data is sent to the drive controller 12 via the data modulator / demodulator 9 and the subsequent error correction code / decoder 8.

  The drive control unit 12 drives the spindle motor 14 by controlling the servo circuit 13 based on the supplied servo error signal S3, thereby rotating the magneto-optical disk 2 at a predetermined speed. Further, the drive control unit 12 controls the magnetic field modulation driver 11 via the error correction code / decoder 8 and the data modulator / demodulator 9 based on the servo error signal S3 to drive the sled motor 15, thereby the magneto-optical disk 2 A beam spot of the upper light beam (hereinafter simply referred to as a beam spot) is arranged in the radial direction of the magneto-optical disk 2 along a data track (pre-groove or land) formed on the recording surface of the magneto-optical disk 2. Move.

  Further, the drive control unit 12 controls the servo circuit 13 based on the servo error signal S3 to drive and control a biaxial actuator (not shown) in the optical pickup 10, thereby performing tracking control and focus control.

  On the other hand, the data modulator / demodulator 9 detects the absolute address of the beam spot on the magneto-optical disk 2 by decoding the supplied push-pull signal S4, and this is detected by the error correction code / decoder 8 and the subsequent. The data is sent to the system controller 4 via the memory controller 7.

  That is, the data modulator / demodulator 9 is included in the push-pull signal S4 by passing the push-pull signal S4 through a band-pass filter circuit in the range of ± 1 [kHz] having a center frequency of 22.05 [Hz] provided therein. The wobble component is extracted, and FM demodulation processing is performed on the wobble component to detect the absolute address on the magneto-optical disk 2 where the beam spot is located, and this is used as address information S5 for error correction coding / decoding. The data is sent to the system controller 4 via the device 8 and the subsequent memory controller 7.

  Further, the data modulator / demodulator 9 changes the absolute address on the magneto-optical disk 2 obtained by the decoding process as described above (that is, whenever the sector in which the beam spot scans on the magneto-optical disk 2 changes). Is transmitted to the system controller 4 via the error correction code / decoder 8 and the subsequent memory controller 7.

  Thus, the system controller 4 sequentially recognizes the current recording position on the magneto-optical disk 2 based on the address information signal S5 and the sync interrupt signal S6 given from the data modulator / demodulator 9, and records based on the recognition result. Necessary control processing is executed so that the data D2 can be correctly recorded on the magneto-optical disk 2.

  On the other hand, when the reproduction mode is selected according to the operation of the operation unit 3 by the user, the system controller 4 controls the drive control unit 12 to perform the magneto-optical disk in the same manner as in the above recording mode. 2 is rotated at a predetermined speed, the beam spot is moved along the data track of the magneto-optical disk 2, and tracking control and focus control are performed.

  Further, the system controller 4 drives the laser diode in the optical pickup 10 described above to emit a light beam toward the magneto-optical disk 2. As a result, this light beam is reflected on the recording surface of the magneto-optical disk 2, and read data D3 read from the magneto-optical disk 2 as an RF signal obtained based on the reflected light is transferred from the optical pickup 10 to the data modulator / demodulator 9. To the error correction code / decoder 8.

  The error correction code / decoder is composed of a PLL (Phase Locked Loop) circuit, a synchronous data detector, an EFM demodulator, a CIRC decoder, and a layered ECC demodulator (all not shown). The clock is extracted from the read data D3, and the extracted clock is sent to the synchronous data detection unit together with the read data D3.

  The synchronization data detection unit generates a synchronization data detection window pulse having a pulse width larger by a predetermined pit before and after the above-described synchronization data data pattern based on the supplied clock. The synchronous data detection unit sequentially detects the synchronous data detection window pulses, and sequentially sends the read data D3 to the EFM demodulation unit in predetermined units based on the detection result.

  The read data D3 is then EFM demodulated in the EFM demodulator, CIRC decoded in the CIRC decoder, and further subjected to error correction in the layered ECC demodulator, so that the original format before recording is obtained. It is converted into audio data D4 and then sent to the audio decoder 6 via the memory controller 7. The error correction code / decoder 8 is configured to use the memory 16 as a buffer as necessary when executing the various processes described above.

  The audio decoder 6 performs a predetermined decoding process on the audio data D4, and then outputs the obtained audio signal S2 to the outside via the output terminal 17 and sends it to the speaker 18 for audio output.

  In this manner, in the magneto-optical disk recording / reproducing apparatus 1, the externally supplied audio signal S1 is recorded on the magneto-optical disk 2, and the audio signal S2 reproduced from the magneto-optical disk 2 is output to the outside or the speaker 18. It is made to be able to do.

  In the magneto-optical disk recording / reproducing apparatus 1, the system controller 4 displays various related information (for example, title name, recording or reproduction time, etc.) added to the audio data D4 in an LCD (Liquid Crystal Display) in the recording mode and the reproduction mode. Are displayed on the display screen of the display unit 19 consisting of

  Further, in the magneto-optical disk recording / reproducing apparatus 1, the other end of an AC adapter having a DC (Direct Current) input terminal and one end connected to a home power supply (not shown) provided outside is connected. Thus, the household power supply can be used as a current supply source.

  When the AC adapter 21 is actually connected between the household power source and the DC input terminal 20, the alternating current S10 supplied from the household power source is converted into a direct current S11 having a rated current value of the AC adapter 21. Thereafter, the direct current S11 is supplied to the power supply unit 22 via the DC input terminal 20.

  The power supply unit 22 supplies the supplied direct current S11 as a system current to various circuits constituting the magneto-optical disk recording / reproducing apparatus 1. At that time, the power supply unit 22 measures the current value of the system current S11 supplied to all these circuits, and sequentially transmits the measurement result to the system controller 4 at a predetermined time timing.

  In addition to such a configuration, the magneto-optical disk recording / reproducing apparatus 1 is provided with a battery storage unit 24 for fixing or detachably storing a secondary battery 23 such as a lithium ion battery, for example. The secondary battery 23 housed in the unit 24 can be used as a power supply source as necessary, such as when carried. That is, the secondary battery 23 stored in the battery storage unit 24 can supply its own charging current to the entire circuit as the system current S12 via the power supply unit 22 when used.

  The secondary battery 23 stored in the battery storage unit 24 can be charged using a DC current S11 supplied from an external household power source via the DC input terminal 20 via the AC adapter 21. Yes. Specifically, in the magneto-optical disk recording / reproducing apparatus 1, a charging IC (Integrated Circuit) unit 25 is provided between the DC input terminal 20 and the battery storage unit 24, and the charging IC unit 25 is controlled based on the control of the system controller 4. By adjusting the current value of the direct current S11 supplied through the DC input terminal 20, the direct current with the adjusted current value is supplied as the charging current S13 to the secondary battery 23 stored in the battery storage unit 24. It is made to be able to do.

  Furthermore, when the audio signal S1 is recorded or reproduced in the recording mode or the reproduction mode, various related information (for example, title name, reproduction time, etc.) added to the audio signal S1 is displayed on the display unit 19. At the same time, the remaining time of the secondary battery 23 loaded in the battery storage unit 24 is displayed as a battery mark (not shown) indicating a plurality of levels according to the remaining capacity.

(2) Internal Configuration of Charging IC Unit FIG. 2 shows the internal configuration of the charging IC unit 25. The charging IC unit 25 includes a constant current control circuit 30 for keeping the DC current S11 input from the outside through the DC input terminal 20 at a constant current value, and a DC current obtained through the constant current control circuit 30. S11 is composed of a current sensor amplifier 32 for generating a potential difference at both ends of the current sense resistor 31 having a predetermined resistance value and differentially amplifying the potential difference.

  In the charging IC unit 25, a current sense resistor 31 having a predetermined resistance value (for example, several tens [mΩ] to several [Ω]) is connected between the constant current control circuit 30 and the battery storage unit 24, and the current sense The two input ends T1 and T2 of the current sensor amplifier 32 are connected to one end and the other end of the resistor 31, respectively.

  The current sensor amplifier 32 has two input terminals T1 and T2 connected to one end and the other end of the switch circuit 33 while maintaining a parallel relationship with the current sense resistor 31, and an output terminal T3 connected to the system controller 4. ing. The system controller 4 is connected to a control input terminal (not shown) of the switch circuit 33 and an offset adjustment terminal T4 of the current sensor amplifier 32.

  Actually, the system controller 4 performs switching control so that the switch circuit 33 is turned on at the start of the charging operation of the secondary battery 23, and then, based on the output voltage output from the output terminal of the current sensor amplifier 32. The variable resistor (not shown) connected to the offset adjustment terminal T4 is adjusted and feedback controlled so that the output offset voltage of the current sensor amplifier 32 becomes zero (that is, cancels).

  After that, the system controller 4 cancels the output offset voltage of the current sensor amplifier 32 by calibration, and then controls the switching circuit 33 so as to be turned off, and the DC supplied from the outside via the DC input terminal 20. The current S11 can be accurately measured, and the discharge current S12 supplied from the secondary battery 23 can also be accurately measured.

(3) Remaining time display method according to the present embodiment In the magneto-optical disk recording / reproducing apparatus 1 according to the present embodiment, a secondary battery 23 that is different for charging and using is used for the loaded secondary battery 23. In some cases, even when recording or reproducing, the operation with different loads in the device is selectively switched, the remaining capacity or remaining time of the secondary battery 23 is always accurately detected, and the remaining capacity or remaining time is detected. The battery mark corresponding to the can be displayed on the display screen of the display unit 19.

  First, based on the discharge current S12 of the secondary battery 23 supplied from the power supply unit 22, the system controller 4 discharges the voltage discharged from the secondary battery 23 stored in the battery storage unit 24 (hereinafter simply referred to as the battery). Voltage) is measured every unit time (1 second).

Subsequently, the system controller 4 sets the battery voltage per unit time (one second) of the secondary battery 23 to E _BATT [V / s] and the discharge current of the secondary battery 23 to I _OUT [I]. The power consumption P _CON [W / s] per unit time (one second) of the secondary battery 23 is _expressed by the following formula:

Seek like.

  The system controller 4 can obtain the remaining capacity Y [W] of the secondary battery 23 and the value of the battery voltage of the secondary battery 23 as a relational expression of X [V]. Such a relational expression is determined based on an experimental result when each secondary battery 23 is discharged at a constant power with a plurality of levels of discharge power as shown in the graph of FIG.

  That is, the graph of FIG. 3 shows that the secondary battery 23 is discharged at four constant powers of 1.0 [W], 0.5 [W], 0.1 [W] and 0.05 [W] at normal temperature (25 [° C.]), respectively. In this case, the relationship between the battery voltage of the secondary battery 23 and its remaining capacity is shown as characteristic curves F1 to F4, respectively. According to these characteristic curves F1 to F4, it can be seen that the rate of decrease of the battery capacity with respect to the battery voltage is lower when the discharge power is lower than when the discharge power is higher.

  Therefore, the system controller 4 can obtain a characteristic graph F10 as shown in FIG. 4 below based on the characteristic curves F1 to F4 representing the relationship between the battery voltage of the secondary battery 23 and its remaining capacity shown in FIG. In addition, using the characteristic graph F10, it is possible to accurately detect the remaining capacity of any type of secondary battery 23 regardless of the type of the secondary battery 23 during operation and the magnitude of the load operation.

In the characteristic graph F10 of FIG. 4, when the battery voltage of the secondary battery 23 is 3.53 [V] or less or 4.08 [V] or more, the remaining capacity of the secondary battery 23 is determined according to only the battery voltage. Is done. When the battery voltage of the secondary battery 23 is 3.53 [V] or more and 4.08 [V] or less, the battery voltage and a predetermined period of the power consumption P _CON [W / s] per second of the secondary battery 23 are given. The remaining capacity of the secondary battery 23 is determined according to an average value (for example, simply referred to as average power consumption hereinafter) within (for example, 1 minute).

  That is, when the battery voltage of the secondary battery 23 is 4.08 [V] or more, the system controller 4 sets the remaining capacity Y [W] of the secondary battery 23 to the next when the battery voltage is X [V]. formula

It can be obtained as a relational expression such as This equation (2) corresponds to the characteristic graph F10A of FIG.

  In addition, when the battery voltage of the secondary battery 23 is 3.53 [V] or more and 4.08 [V] or less, the system controller 4 sets the battery voltage of the secondary battery 23 to X [V] for 1 second of the secondary battery 23. When the average power consumption per unit is a [W / s], the remaining capacity Y [W] of the secondary battery 23 is expressed by the following equation.

As described above, the average value of power consumption a [W] per second of the secondary battery 23 can be obtained as a value having a change width. Expressions (3) and (4) correspond to the characteristic graphs F10B and F10C in FIG. 4, respectively.

  Regarding the expressions (3) and (4), the system controller 4 determines that the battery voltage X [V] of the secondary battery 23 is expressed by the expressions (3) and (4) so as to approximate the graph shown in FIG. When taking different values, the minimum value was adopted.

  Further, when the battery voltage of the secondary battery 23 is 3.53 [V] or less, the system controller 4 determines the remaining capacity Y [W] of the secondary battery 23 as X [V] formula

It can be obtained as a relational expression such as This equation (5) corresponds to the characteristic graph F10D of FIG.

  For these formulas (4) and (5), the system controller 4 makes the battery voltage of the secondary battery 23 in the formulas (4) and (5) as close as possible to the characteristic curves F1 to F4 shown in FIG. The maximum value of X [V] was adopted.

In this way, after obtaining the remaining capacity [W] of the secondary battery 23 with respect to the battery voltage [V], the system controller 4 determines the remaining capacity [W] of the secondary battery 23 corresponding to the current operation mode. By accumulating with the power consumption P _CON [W / s] per second, the remaining time T [s] of the secondary battery 23 is expressed by the following equation:

Can be obtained as follows.

(4) Calculation method of remaining time of secondary battery 23 for each operation mode In recent magneto-optical disk recording / reproducing apparatus 1, not only a normal recording mode (hereinafter referred to as SP mode) but also SP mode The audio signal S1 can be written to the magneto-optical disk 2 in a long-time recording mode (hereinafter referred to as the LP mode) for recording by increasing the recording time by 2 times (LP2) or 4 times (LP4). There is something that was made.

  In the magneto-optical disk recording / reproducing apparatus 1 equipped with such a switching function between the SP mode and the LP mode, the SP mode for normal recording is more secondary than the LP mode for long-time recording at the time of reproducing operation or recording operation. The power consumption per unit time of the battery 23 is large.

  For this reason, when the remaining time of the currently loaded secondary battery 23 is displayed based on the SP mode (or LP mode), the mode is switched to the LP mode (or SP mode) according to the user's operation. For this, it is desirable to instantaneously switch the display state as the remaining capacity or remaining time during the reproducing operation or recording operation in the LP mode (or SP mode).

In the magneto-optical disk recording / reproducing apparatus 1, in order to realize switching of the display state according to the operation mode, the system controller 4 uses the power consumption P _CON per second of the secondary battery 23 in the SP mode and the LP mode, respectively. When switching from the SP mode to the LP mode or switching from the LP mode to the SP mode is performed by calculating [W / s] in units of a predetermined period (for example, 1 minute) and calculating the average value. In addition, the remaining capacity or remaining time of the secondary battery 23 can be instantaneously switched and displayed.

  Actually, in the magneto-optical disk recording / reproducing apparatus 1, during the reproducing operation or the recording operation, as shown in FIG. 5A, the access or non-access to the magneto-optical disk 2 is time according to the SP mode or LP mode. It is designed to be repeated at intervals. At that time, the power consumption of the secondary battery 23 in the SP mode and the LP mode is different when the optical pickup 10 (FIG. 1) accesses the magneto-optical disk 2 (hereinafter referred to as read). This is almost the same when the magneto-optical disk 2 is not accessed (hereinafter referred to as non-reading).

  Therefore, in the magneto-optical disk recording / reproducing apparatus 1, the system controller 4 calculates the average power consumption per second of the secondary battery 23 separately for the SP mode and the LP mode at the time of reading and non-reading, respectively. A value obtained by adding the average power consumption at the time and the non-read time is used as the average power consumption per second of the secondary battery 23 in the actual SP mode or LP mode.

  Specifically, first, as shown in FIG. 5B, the system controller 4 adds up the power consumption per second of the secondary battery 23 at the time of reading for 1 minute in each of the SP mode and the LP mode, and averages them. A value is obtained, and the obtained average power consumption is stored as a predetermined conversion table (not shown) in the memory 7A (FIG. 1). Usually, since the power consumption per minute of the secondary battery 23 at the time of reading differs greatly between the SP mode and the LP mode, the conversion table corresponding to each mode with the average power consumption obtained in units of one minute as a fixed value in advance. It was made to describe in.

  Subsequently, the system controller 4 reduces the power consumption per second of the secondary battery 23 during non-reading for 5 minutes from the operation start time of the mode (SP mode or LP mode) selected according to the user's operation. After integration while sequentially calculating one minute at a time, the average value obtained in units of one minute is calculated as average power consumption. At this time, the system controller 4 calculates the non-read time every minute except the read time even if the read time exists within the unit time (1 minute).

  Then, after 5 minutes have elapsed since the start of the SP mode or LP mode operation, the system controller 4 integrates the power consumption per second of the secondary battery 23 during non-reading while calculating sequentially for 5 minutes, The average value obtained in units of 5 minutes is calculated as the average power consumption. At this time, the system controller 4 calculates the non-read time every 5 minutes except for the read time even if the read time exists within the unit time (5 minutes).

  Normally, the power consumption per second of the secondary battery 23 at the time of non-read takes the same value in both the SP mode and the LP mode. While the average power consumption is calculated in 1 minute intervals, the average power consumption is calculated in 5 minute units after the lapse of 5 minutes.

  As described above, as shown in FIGS. 6A and 6B, the system controller 4 reads out the average power consumption per minute of the secondary battery 23 in the non-reading mode and the memory 7A in the SP mode or the LP mode. By adding the average power consumption per minute of the secondary battery 23 at the time of reading, the added value is determined as the average power consumption per minute of the secondary battery 23 in the SP mode or the LP mode.

  Thus, even when the mode is switched between the SP mode and the LP mode according to the user's operation, the system controller 4 can perform 2 during the reproducing operation or the recording operation in the mode after the switching from the mode before the switching. The remaining capacity or remaining time of the secondary battery 23 can be accurately displayed on the display screen of the display unit 19.

(5) Remaining time display processing procedure In the magneto-optical disk recording / reproducing apparatus 1 according to the present embodiment, when the system controller 4 is turned on, the remaining time display processing procedure RT1 shown in FIGS. Starting from SP0, in the following step SP1, the battery voltage of the secondary battery 23 stored in the battery storage unit is detected every second.

  Subsequently, in step SP2, the system controller 4 starts the reproduction operation or the recording operation in accordance with the user operation, and then proceeds to step SP3 to determine whether the current operation mode is the SP mode or the LP mode. recognize.

  Then, the system controller 4 proceeds to step SP4, and uses the conversion table (not shown) in the memory to calculate the average power consumption per minute of the secondary battery 23 at the time of reading corresponding to the recognized mode or LP mode. After obtaining, the process proceeds to step SP5.

  In step SP5, the system controller 4 proceeds to step SP6 while sequentially calculating the power consumption per second of the secondary battery 23 at the time of non-reading, and determines whether or not one minute has passed since the operation start time. .

  After waiting for an affirmative result in step SP6, the system controller 4 proceeds to the subsequent step SP7, and calculates an average value obtained by integrating the power consumption per second of the secondary battery 23 in the non-read state in units of one minute. Calculate as average power consumption.

  Then, the system controller 4 proceeds to step SP8 and determines whether or not 5 minutes have elapsed from the operation start time. If a negative result is obtained, the system controller 4 proceeds to step SP10 and proceeds to 1 minute of the secondary battery 23. The average power consumption per unit is added at the time of non-reading and at the time of reading, and the added value is determined as the average power consumption per minute of the secondary battery 23 in the SP mode or the LP mode.

  In step SP11, the system controller 4 then determines the remaining capacity of the secondary battery 23 based on the battery voltage of the secondary battery 23 and the average power consumption per minute in the SP mode or LP mode that is the current operation mode. Ask for.

  Subsequently, the system controller 4 proceeds to step SP12, and based on the remaining capacity of the secondary battery 23 and the power consumption per minute of the secondary battery 23 corresponding to the current operation mode (SP mode or LP mode), After obtaining the remaining time of the secondary battery 23, the process proceeds to step SP13, where the remaining time is displayed as a battery mark on the display screen of the display unit, and the process proceeds to step SP14 as it is to end the remaining time display processing procedure RT1. .

  On the other hand, if a positive result is obtained in step SP8 described above, it means that 5 minutes have elapsed since the start of the operation. At this time, the system controller 4 proceeds to step SP9, and the secondary at the time of non-reading. An average value obtained by integrating the power consumption per second of the battery 23 in units of 5 minutes is obtained as the average power consumption.

  Next, the system controller 4 proceeds to step SP10, and further calculates the average power consumption per minute of the secondary battery 23, and then adds the average power consumption per minute during non-reading and reading. The added value is determined as the average power consumption per minute of the secondary battery 23 in the SP mode or the LP mode.

  In step SP11, the system controller 4 then determines the remaining capacity of the secondary battery 23 based on the battery voltage of the secondary battery 23 and the average power consumption per minute in the SP mode or LP mode that is the current operation mode. Ask for.

  Subsequently, the system controller 4 proceeds to step SP12, and based on the remaining capacity of the secondary battery 23 and the power consumption per minute of the secondary battery 23 corresponding to the current operation mode (SP mode or LP mode), After obtaining the remaining time of the secondary battery 23, the process proceeds to step SP13, where the remaining time is displayed as a battery mark on the display screen of the display unit, and the process proceeds to step SP14 as it is to end the remaining time display processing procedure RT1. .

  As described above, the magneto-optical disk recording / reproducing apparatus accurately detects the remaining capacity of the secondary battery 23 even when the secondary battery 23 is different from that used for charging during the reproducing operation or the recording operation. The remaining time of the battery 23 can be displayed on the display screen of the display unit. Further, even when the operation mode with different loads inside the device is selectively switched as in the SP mode and the LP mode, the remaining capacity of the secondary battery 23 is always accurately detected according to the selected operation mode. The remaining time can be displayed on the display screen of the display unit.

(6) Operation and effect according to the present embodiment In the above configuration, the magneto-optical disk recording / reproducing apparatus 1 is configured in accordance with the results of experiments in which a predetermined secondary battery 23 is discharged at a constant power at a plurality of levels. The relational expression between the battery voltage and the remaining capacity of the secondary battery 23 is set in advance so that the average power consumption per unit time becomes a parameter.

  Actually, in the magneto-optical disk recording / reproducing apparatus 1, after obtaining the average power consumption per unit time from the current battery voltage of the secondary battery 23 at the time of reproducing operation or recording operation, based on the above relational expression, The remaining capacity of the secondary battery 23 can be obtained.

  As a result, the magneto-optical disk recording / reproducing apparatus 1 accurately determines the remaining capacity of the loaded secondary battery 23 even when the secondary battery 23 is different from that used during charging during the reproducing operation or the recording operation. The remaining time can be detected and displayed on the display screen of the display unit 19.

  In the magneto-optical disk recording / reproducing apparatus 1, when the remaining capacity of the secondary battery 23 is obtained, the SP mode for normal recording and the LP mode for long-time recording are divided into a read time and a non-read time for the secondary battery 23, respectively. After calculating the average power consumption per unit time, the value obtained by adding the average power consumption at the time of reading and non-reading is used as the average power consumption per unit time of the secondary battery 23 in the actual SP mode or LP mode. As a result, even when the operation mode (SP mode or LP mode) with a different load inside the device is selectively switched, the remaining capacity of the loaded secondary battery 23 is accurately detected and the remaining The time can be displayed on the display screen of the display unit 19.

  According to the above configuration, in the magneto-optical disk recording / reproducing apparatus 1, the relational expression between the battery voltage and the remaining capacity of the secondary battery 23 is based on the experimental result of discharging the secondary battery 23 at a plurality of levels at constant power. Thus, the average power consumption per unit time of the secondary battery 23 is set in advance as a parameter, and the battery voltage of the current secondary battery 23 is determined based on the above-described relational expression at the time of reproduction operation or recording operation. In addition, since the remaining capacity of the secondary battery 23 is obtained from the average power consumption per unit time, when the secondary battery 23 different from the charge time is used during the reproduction operation or the recording operation, Even when the operation mode is selectively switched to a different operation mode, the remaining time of the loaded secondary battery 23 can be displayed on the display screen of the display unit. The magneto-optical disc recording and reproducing apparatus 1 can be realized which can always accurately detect the remaining battery capacity.

(7) Other Embodiments In the above-described embodiment, the case where the present invention is applied to the magneto-optical disk recording / reproducing apparatus 1 as shown in FIG. 1 has been described. The essential point is not only the battery remaining capacity detection device for detecting the remaining capacity of the battery, but also an electronic device that executes various processing operations using the battery. (Digital Versatile Disk) and other recording and / or reproducing devices, and CD (Compact Disk) and other optical disk recording and / or reproducing devices, video cameras, mobile phones, and other various types of electronic devices. it can.

  Further, in the above-described embodiment, the case where the secondary battery 23 such as a lithium ion battery is applied as the battery has been described. However, the present invention is not limited to this, and a secondary battery such as another nickel cadmium storage battery, It can be widely applied to various batteries such as primary batteries such as manganese dry batteries and mercury batteries.

  Further, in the above-described embodiment, the system is used as a power consumption detection unit that detects the power consumption per unit time of the secondary battery 23 based on the battery voltage (accumulated voltage) and the discharge current of the secondary battery 23. Although the case where the controller 4 and the charging IC unit 25 are applied has been described, the present invention is not limited thereto, and may be widely applied to power consumption detecting means having various configurations.

  Furthermore, in the above-described embodiment, the remaining capacity of the secondary battery 23 is an experiment in which a predetermined battery is discharged at a constant power level at a plurality of levels using the detected power consumption per unit time of the secondary battery 23 as a parameter. Remaining capacity calculation calculated using a characteristic graph F10 (FIG. 4) which is a relational expression with the battery voltage (accumulated voltage) of the secondary battery 23 obtained based on the results (characteristic curves F1 to F4 shown in FIG. 3). As a means, the case where the system controller 4 and the charging IC unit 25 are applied has been described. However, the present invention is not limited to this, and may be widely applied to remaining capacity calculating means having various configurations. .

  In this case, in the present embodiment, the characteristic graph F10 based on the experimental result is configured from a combination of four types of characteristic graphs F10A to F10D corresponding to the battery voltage of the secondary battery 23. As long as it is based on the experimental results of constant power discharge of any battery (primary battery or secondary battery) at multiple levels, such as 3 types or less or 5 types or more, as a characteristic graph having various other characteristics Can be widely applied. In addition, you may make it discharge the thing of various constant power values other than the characteristic curves F1-F4 like FIG.

  Furthermore, in the above-described embodiment, the case where the display unit 19 shown in FIG. 1 is applied as the display means for displaying the calculated remaining capacity of the secondary battery 23 has been described. However, the present invention is not limited to this, so long as it can display either or both of the remaining capacity and the remaining time of the battery, the present invention may be widely applied to display means having display forms having various configurations.

  Further, in the above-described embodiment, the remaining time of the secondary battery 23 is calculated based on the calculated remaining capacity of the secondary battery 23 and the detected power consumption per unit time of the secondary battery 23. The case where the system controller 4 and the charging IC unit 25 are applied as the remaining time calculating means is described. However, the present invention is not limited to this, and in short, if the remaining time of the secondary battery can be detected. In addition, the present invention may be widely applied to remaining time calculation means having various configurations.

  Further, in the above-described embodiment, the magneto-optical disk recording / reproducing apparatus (electronic device) 1 has a plurality of operation modes (SP mode and LP mode) in which the load of the secondary battery 23 is different, and the system controller 4 and The charging IC unit 25 (power consumption detection means) calculates the power consumption per unit time of the secondary battery 23 for each operation mode and sets the remaining capacity of the secondary battery 23 to an externally designated operation mode. The case where the calculation is performed using the characteristic graph F10 which is a relational expression with the battery voltage (accumulated voltage) of the secondary battery 23 using the power consumption per unit time of the secondary battery 23 corresponding to the above as a parameter has been described. However, the present invention is not limited to this. In short, if the power consumption can be calculated for each operation mode, the remaining capacity of the secondary battery 23 is detected using various other methods. It may be so.

  The remaining battery level detection apparatus and method, and electronic equipment can be applied to portable audio equipment, mobile phones, and the like.

1 is a block diagram showing a configuration of a magneto-optical disk recording / reproducing apparatus according to a first embodiment. FIG. It is a block diagram which shows the internal structure of the charging IC part shown in FIG. It is a graph with which it uses for description of the relationship between the battery voltage at the time of discharge, and battery capacity. It is a graph with which it uses for description of the characteristic graph based on the experimental result by this Embodiment. It is. It is a rough-line top view with which it uses for description of the repetition state at the time of a non-read and a read. FIG. 5 is a schematic plan view for explaining the average power consumption per unit time of the secondary battery for each operation mode. It is a flowchart with which it uses for description of the remaining time display processing procedure. It is a flowchart with which it uses for description of the remaining time display processing procedure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Magneto-optical disk recording / reproducing apparatus, 2 ... Magneto-optical disk, 3 ... Operation part, 4 ... System controller, 10 ... Optical pick-up, 22 ... Power supply part, 23 ... Secondary battery, 24 …… Battery storage unit, 25 …… Charging IC unit, F1 to F4 …… Characteristic curve, F10 (F10A to 10D) …… Characteristic graph, RT1 …… Remaining time display processing procedure.

Claims (8)

In the battery remaining amount detection device for detecting the remaining capacity of the battery,
Power consumption detection means for detecting the power consumption per unit time of the battery based on the accumulated voltage and discharge current of the battery;
The remaining capacity of the battery is obtained based on an experimental result obtained by discharging a predetermined battery at a plurality of levels with a power consumption per unit time detected by the power consumption calculation unit as a parameter. And a remaining capacity calculating means for calculating using a relational expression with a battery storage voltage. Remaining time calculation for calculating the remaining time of the battery based on the remaining capacity of the battery calculated by the remaining capacity calculating means and the power consumption per unit time of the battery detected by the power consumption detecting means The battery remaining amount detection device according to claim 1, further comprising: means. In the battery remaining amount detection method for detecting the remaining capacity of the battery,
A first step of detecting power consumption per unit time of the battery based on the accumulated voltage and discharge current of the battery;
The battery's remaining capacity is determined based on the result of an experiment in which a predetermined battery is discharged at a constant power at a plurality of levels using the detected power consumption per unit time of the battery as a parameter; A battery remaining amount detection method comprising: a second step of calculating using the relational expression. A third step of calculating the remaining time of the battery based on the calculated remaining capacity of the battery and the detected power consumption per unit time of the battery is provided. Item 4. The remaining battery level detection method according to Item 3. In electronic devices that perform various processing operations using batteries,
Power consumption detection means for detecting the power consumption per unit time of the battery based on the accumulated voltage and discharge current of the battery;
The remaining capacity of the battery is obtained based on an experimental result obtained by discharging a predetermined battery at a plurality of levels with a power consumption per unit time detected by the power consumption calculation unit as a parameter. A remaining capacity calculating means for calculating using a relational expression with the storage voltage of the battery;
An electronic device comprising: display means for displaying the remaining capacity of the battery calculated by the remaining capacity calculating means. Remaining time calculation for calculating the remaining time of the battery based on the remaining capacity of the battery calculated by the remaining capacity calculating means and the power consumption per unit time of the battery detected by the power consumption detecting means Means,
The electronic device according to claim 5, wherein the display unit displays the remaining time of the battery calculated by the remaining time calculation unit. The electronic device has a plurality of operation modes with different battery loads,
The power consumption detection means is
For each of the above operating modes, calculate the power consumption per unit time of the battery,
The remaining capacity calculating means is
The remaining capacity of the battery is calculated using the relational expression with the storage voltage of the battery, using the power consumption per unit time of the battery corresponding to the externally designated operation mode as a parameter. The electronic device according to claim 5. The remaining time of the battery is based on the remaining capacity of the battery calculated by the remaining capacity calculating means and the power consumption per unit time of the battery corresponding to the operation mode detected by the power consumption detecting means. A remaining time calculation means for calculating
The electronic device according to claim 7, wherein the display unit displays the remaining time of the battery calculated by the remaining time calculation unit.

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