JP3417607B2 - Rechargeable battery charger and charging method - Google Patents

Description

Detailed Description of the Invention

[0001]

[Table of Contents] The present invention will be described in the following order. Industrial applications Conventional technology Problems to be Solved by the Invention Means for Solving the Problems (FIGS. 6 to 7) Action (Figs. 6-7) Example (1) Overall configuration (Figs. 1-5) (2) Power supply circuit (Figs. 6 to 10) (3) Effects of the embodiment (4) Other embodiments The invention's effect

[0002]

BACKGROUND OF THE INVENTION The present invention relates to a charging device for a secondary battery and
The charging method can be applied to, for example, a power source of a remote commander that controls the operation of the compact disk player body.

[0003]

2. Description of the Related Art Heretofore, there have been portable compact disc players which have a smaller overall shape and can be driven by a battery .

That is, in this type of compact disc player, by reducing the overall shape,
It is designed to be easily portable, and by being driven by a battery , the user can carry it and listen to music at a desired place.

[0005] In yet compact disc player of this type, the battery as a so as to be able to use the secondary battery such as Nitsukado battery, thereby optionally charges the secondary battery is also used again It is designed to get you.

[0006]

By the way, this kind of secondary
In the charging apparatus for charging a battery, when charging starts, the secondary
The terminal voltage of the battery is detected, and for a secondary battery below the specified voltage, it is judged that some abnormality has occurred and the charging process is stopped to effectively avoid accidents such as liquid leakage. It is designed to get you.

However, this type of secondary battery may be in a state close to full discharge when it is left unused for a long time, and in this case, even if no abnormality occurs, the terminal voltage May fall below this specified value. Although such a secondary battery can be charged and used, there is a problem that it cannot be charged by a conventional charging device.

If this type of secondary battery that is close to complete discharge can be charged, the secondary battery can be effectively used, and the usability of this type of compact disk player can be further improved.

The present invention has been made in consideration of the above points, and an object of the present invention is to propose a secondary battery charging device and a charging method capable of reliably charging a secondary battery that is almost completely discharged. Is.

[0010]

In order to solve such a problem, in the present invention, the terminal voltage of the secondary battery 73 is detected.
Voltage detection means 86, 87, 88 and the secondary battery 73.
Charging current supply means 83, 84 for supplying electric current, and voltage
Operation of charging current supply means 83, 84 based on the detection result
Control means 76 and 82 for controlling the
6, 82, charging current for a certain period in the initial charging process
Supply of charging current and then stopping the supply of charging current for a certain period of time
Is periodically repeated a prescribed number of times to detect voltage
7, 88 in the repetitive range of the secondary battery 73
When it is detected that the terminal voltage has reached the reference voltage V _TH
Controls the charging current supply means 83, 84 to perform normal charging.
The terminal voltage of the secondary battery 73 is
When it is detected that the reference voltage V _TH is not reached, the charging power is
Flow control means 83, 84 to charge the secondary battery 73.
I decided to cancel.

[0011]

[0012]

[Operation] A charging current is supplied to the secondary battery 73 for a certain period.
After that, periodically stop the supply of charging current for a certain period.
Repeated the specified number of times, and the secondary
When the terminal voltage of the battery 73 reaches a predetermined reference voltage V _TH
If the secondary battery 73 is normally charged,
If the terminal voltage of 73 does not reach the reference voltage V _TH ,
By stop charging the next battery 73 completely when the discharge may also be used to charge the secondary battery 73 discharges to the state close to the charge obtained, further secondary battery 73 that occur some abnormality Therefore, it is possible to effectively avoid the occurrence of accidents such as liquid leakage and stop charging.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

(1) Overall Configuration In FIG. 1, reference numeral 1 denotes a portable compact disc player as a whole, a compact disc player main body 2 for reproducing the compact disc, and a remote commander 3 for remotely controlling the compact disc player main body 2. It is formed by and.

Here, the compact disk player body 2
After sliding the lid opening / closing operator 4 to open the upper lid 5,
By placing the compact disc on the table 6 and closing the upper lid 5, the compact disc is held in a reproducible state. In this state, the compact disc player main body 2 is configured such that the power can be turned on by operating any one of the operators 8 to 16 arranged on the front surface, and the operator 8 is further pressed. When the compact disc playback operation is started and the playback operation is continued,
The button can be pressed to pause.

Further, the compact disc player body 2
The playback operation can be stopped by pressing the operation element 9 adjacent to the operation element 8. Further, in the reproduction stopped state, the operation element 9 can be pressed to switch off the power supply. It is done like this. As a result, the compact disc player main body 2 can operate the operating elements 8 to 16 of the compact disc player main body 2 to turn on the power source and then execute a desired reproduction process, and further operate the operating element 9. Then, the power can be turned off.

Further, the compact disc player body 2
Is the operator 1 of the front skip after starting the playback operation.
By repeatedly pressing 0 and 11 respectively, it is possible to skip the performance being reproduced in the reverse direction with respect to the reproducing direction and the reproducing direction, in units of one song.
Further, by continuously pressing the operating elements 10 and 11, the reproduction speed is increased in the reproduction direction and in the direction opposite to the reproduction direction so that the performance to be reproduced can be searched.

Further, the compact disc player body 2
Is the ESP mode operator 12 after starting the playback operation.
Is operated to switch the operation mode between the ESP mode and the normal mode. On the other hand, the compact disc player main body 2 has an earphone jack 13, a volume control operator 14 and an operation mode switching operator 15 arranged on the side surface, and an earphone plug is inserted into the earphone jack 13 for operation. By operating ~ 15, the compact disc player main body 2 alone can listen to the compact disc without using the remote commander 3.

That is, the compact disc player main body 2 has a state in which the remote control of the remote commander 3 is received (hereinafter, referred to as a standby state) and a state in which the remote control is not received by repeatedly sliding the front hold switch 16 to the left. The hold switch 16 is slid to the right and held to accept the remote control of the remote commander 3 and to operate the operators 8 to 15 provided on the compact disc player main body 2. It can be held in a state where it is not accepted (hereinafter referred to as a hold state). This enables the compact disk player 1
Slides the hold switch 16 to the right,
For example, it is possible to effectively avoid erroneous operation of the operators 8 to 15 when the compact disk player body 2 is stored in a bag or the like.

Corresponding to the operators of the compact disc player body 2, the remote commander 3 has a reproduction operator 18, a skip operators 19 and 20, a reproduction stop operator 21, and an ESP mode switching operator 22. It is arranged to output control data to the compact disc player main body 2 in response to the operation of each of the operating elements 18 to 22.

Thereby, the compact disk player 1
The operation of the compact disk player body 2 can be switched in the same manner as when the operators 18 to 24 are operated to operate the corresponding operators 8 to 14 of the compact disk player body 2.

Further, the remote commander 3 has an earphone jack 23 and a volume adjusting operator 24 arranged on the side surface thereof, and when the compact disk player body 2 is set to the standby state and the hold state, the compact disk player is set. The audio signal wirelessly transmitted from the main body 2 is output from the earphone jack 23. As a result, the remote commander 3
After inserting an earphone plug into the earphone jack 23 instead of the earphone jack 13 of the compact disc player body 2, the compact disc player body 2
The audio signal reproduced by the compact disk player main body 2 can be listened to wirelessly by switching the operation modes of the above.

That is, conventionally, among the portable audio equipments of this type, an equipment which can listen to an audio signal through a remote commander has been designed so that an earphone cable is directly connected to the remote commander. However, in such a case, it is necessary to separately prepare earphones when auditioning the audio signal with only the main body device, and even if only the earphones are broken, it is necessary to replace and repair them together with the remote commander.

On the other hand, as shown in FIG. 2, earphone jacks 13 and 23 are formed on both the compact disk player body 2 and the remote commander 3, and the compact disk player body 2 is selectively selected according to the user's needs. Alternatively, if the earphone plug P can be connected to the remote commander 3, it is possible to prepare an earphone without separately preparing it.
The earphone desired by the user can be connected to listen to the audio signal, and if the earphone fails, only the earphone can be replaced.

Therefore, the usability of the compact disc player 1 can be further improved accordingly. Thus, in the compact disk player 1 as described above,
The earphone jacks 13 and 23 are formed so that a stereo type so-called mini-plug P can be connected, thereby improving usability.

With this, the compact disk player 1
Connect the earphone plug to the remote commander 3 to connect the compact disk player body 2 to the remote commander 3.
By controlling the above operation, the audio signal can be freely auditioned even when the compact disc player main body 2 is stored in a bag or the like.

At this time, the remote commander 3 uses the earphone cable 25 connected to the earphone jack 23.
Is used as an antenna to transmit and receive desired data to and from the compact disc player body 2, and to receive an audio signal transmitted from the compact disc player body 2. As a result, the compact disc player 1 can receive an audio signal or the like with a compact and simple shape as a whole, and the compact disc player 1 can be operated only when the remote commander 3 needs to control the operation of the compact disc player main body 2. Desired data can be transmitted and received between the player main body 2 and the remote commander 3.

That is, when the earphone plug is not connected to the earphone jack 23 on the remote commander 3 side, it can be determined that the remote commander 3 does not need to remotely control the compact disk player body 2. In this case, the remote commander 3 If data can be transmitted to and received from, the compact disk player body 2 may be erroneously controlled.

If the cable of the earphone is used as an antenna, the remote commander 3 receives the data sent from the compact disk player body 2 when it is not necessary to remotely control the compact disk player body 2 by the remote commander 3. By not obtaining it, the power supply of the remote commander 3 can be controlled on the basis of this data reception result, and useless power consumption of the remote commander 3 can be reduced.

Further, the remote commander 3 has a liquid crystal display section 26, and the liquid crystal display section 26 can display the operation mode of the compact disk player main body 2 and the like. Therefore, the compact disc player body 2
The substrate storage space 28 is formed inside the upper lid 5, and the transmission / reception substrate is stored in the substrate storage space 28. As a result, the compact disc player main body 2 receives the control data transmitted from the remote commander 3 on the transmitting / receiving board, and further transmits the audio signal and the display data of the liquid crystal display unit 26 to the remote commander 3.

At this time, the remote commander 3 operates the operator 1.
When 8 to 22 are operated, the control data is transmitted in response to this operation, whereas the compact disc player main body 2 continuously transmits the display data in the standby state and the hold state, whereby the remote control is performed. The operation of the compact disk player body 2 can be monitored on the commander 3 side.

Therefore, as shown in FIG. 3, when the remote commander 3 sends the control data, the remote commander 3 displays the symbol 30 indicating the control data transmitting operation, and further, the remaining display of the liquid crystal display unit 26 according to the display data. Switch. That is, the remote commander 3 displays the key symbol 31 when the manipulator 16 is operated and the compact disc player body 2 is set to the hold state, and the manipulators 10, 1 are displayed.
When the compact disk player body 2 starts the search operation in response to the operation of 1, 19, or 20, the symbol 32 or 33 indicating the search direction is displayed.

Further, the remote commander 3 displays an elliptical symbol 34 when the compact disk is held in the loaded state, and the compact disk player body 2 is displayed.
When the reproduction operation is started, a fan-shaped symbol 35 formed in a manner similar to a compact disc is displayed inside the symbol 34 sequentially and cyclically. As a result, the remote commander 3 displays the fan-shaped symbol 35 so as to move according to the rotation of the compact disc during reproduction. In the search mode, the switching of the display of the symbol 35 is accelerated, and the reproduction direction is further increased. This moving direction is switched according to the above.

Further, the remote commander 3 is set to "INTRO" when the compact disc player main body 2 is set to the intro mode for sequentially reproducing the beginning portion of each performance.
Is displayed, and when the compact disc player main body 2 is set to the program mode for reproducing in the preset song order, the display of "PGM" is displayed. Furthermore, when the compact disk player body 2 is set to the shuttle full mode in which the performance is randomly reproduced, the remote commander 3 displays a display of “SHUFFLE”, and the compact disk player body 2 is set to the repeat mode in which the performance is repeatedly played. When set, the arrow symbol 36 is displayed.

Further, when the operation mode for emphasizing the low tone of the reproduced audio signal is selected, the remote commander 3 displays the display of "DBB" and displays "MID" or "MAX" according to the emphasizing level. The display is displayed, and further, the 2-digit 7-segment display unit 37 is driven to display the track number and the like. Further, when the volume limit mode for limiting the volume is selected, the remote commander 3 displays the human face symbol 38 and the number "1" or "2" according to the level of the limit. Further, the remote commander 3 displays warning symbols 39 and 40, respectively, when the power supplies of the compact disk player body 2 and the remote commander 3 are reduced.

That is, when the compact disc player main body 2 is remotely controlled by the remote commander 3 as in this embodiment and the audio signal reproduced by the compact disc player main body 2 is wirelessly auditioned, the compact disc player main body 2 is simply remoted. The power consumption on the remote commander 3 side is significantly increased as compared with the case of controlling. Therefore, in the compact disc player 1, it is necessary to monitor the power consumption not only on the compact disc player main body 2 side but also on the remote commander 3 side and issue a warning if necessary.

Therefore, in this embodiment, the compact disk player main body 2 monitors the power supply voltage of the compact disk player main body 2 to monitor the consumption of the battery housed in the compact disk player main body 2, and this power supply voltage When it drops below a predetermined value, it is determined that the battery has run down. When it is determined that the battery is exhausted, the compact disc player body 2 outputs this determination result by using the display data sent to the remote commander 3, and the remote commander 3 displays the display unit 39 based on the reception result. Is displayed.

On the other hand, the remote commander 3 also monitors the power consumption of the built-in battery by monitoring the power supply voltage, and displays the display unit 40 when the power supply voltage drops below a predetermined value. Here, the display portions 39 and 40 are formed of the same symbol, and are provided outside the liquid crystal display portion 26.
In the case of the remote commander 3, the compact disk 3
4 and symbols 41A and 41B printed in a manner similar to the symbol 30 of the transmission operation can identify the power sources of the compact disk player body 2 and the remote commander 3. As a result, the compact disc player 1 enables the user to easily confirm the consumption of the power sources of the compact disc player main body 2 and the remote commander 3.

On the other hand, the compact disc player main body 2 is adapted to reproduce the audio data through the large capacity memory when the operation mode is switched to the ESP mode, so that even if the track jumping is caused by vibration or the like, the audio data is continuously reproduced. It is designed to reproduce audio signals. The remote commander 3 causes the compact disk player body 2 to ESP when the operator 22 is operated.
When the mode is switched to, the display unit 42 is displayed and the amount of data stored in this memory can be displayed.

As a result, the compact disk player 1
Is adapted to operate the compact disc player main body 2 wirelessly and monitor its operating state. Furthermore, the remote commander 3 can be used to listen to the audio signal reproduced by the compact disc player main body 2 wirelessly. ing.

Here, as shown in FIG. 4, the compact disc player main body 2 drives the spindle motor by driving the mechanical portion 51 based on the control code output from the system control circuit 57, and mounts it on the table 6. The placed compact disk is driven at a predetermined rotation speed.
In this state, the compact disc player main body 2 irradiates the compact disc with the light beam of the optical pickup at the mechanical portion 51, receives the reflected light beam by the optical pickup, and outputs the received light result to the amplifier circuit 52.

As a result, the compact disc player body 2 can detect the tracking error signal and the focus error signal via the amplifier circuit 52.
By controlling the mechanical unit 51 based on the tracking error signal and the focus error signal, the tracking control and the focus control can be performed. Further, the amplifier circuit 52 amplifies the reproduction signal RF which is the reproduction result of the compact disk and then converts it into binary data, whereby the compact disk player body 2
Is capable of detecting audio data, address data added to the audio data, and the like based on the binarized data.

The data processing circuit 53 stores audio data sequentially input via the memory controller 54 in the memory 55, and performs error correction processing and deinterleave processing on the audio data. Further, the data processing circuit 53 sequentially inputs the audio data thus stored in the memory 55 and outputs the audio data to the audio output circuit 56, and the audio output circuit 56 converts the audio data into an analog analog conversion circuit by a built-in analog digital conversion circuit. Convert to signal.

Further, the audio output circuit 56 amplifies this analog signal by a predetermined amplifier circuit and outputs it to the earphone jack 13, whereby the compact disc player main body 2 outputs the audio signal recorded on the compact disc. You can listen to it.

When the audio signal is reproduced in this way, the system control circuit 57 operates the E on the basis of the control data DC of the remote commander 3 when the operator 12 is operated.
When the SP mode is set, the rotation speed of the compact disk is increased and the processing speed of the data processing circuit 53 and the like is increased, whereby the transfer speed of the audio data sequentially stored in the memory 55 is The entire operation is controlled so as to be faster than the transfer rate of the audio data output from 55. Further, when the audio data is accumulated in the memory 55 at a predetermined value or more in this state, the system control circuit 57 suspends the reproducing operation of the compact disk.

As a result, the compact disc player body 2 can successively output the audio signal while the reproduced audio data is always held in the memory 55 at a certain value or more, and when an abnormality such as a track jump occurs. However, it is designed to be able to output a continuous audio signal. That is, the system control circuit 57 monitors the tracking error signal, the focus error signal, and the address data added to the audio data, and if the audio data cannot be continuously reproduced correctly, the system control circuit 57 reproduces the audio data correctly. The audio data that was profitable was repeatedly played.

As a result, in the compact disc player main body 2, when a disturbance such as vibration occurs frequently, the amount of data in the memory 55 decreases, so that the memory 55 is reduced.
The amount of data stored in the display unit 26 is displayed by the symbol 42 of the display unit 26, and the user is alerted.

Further, the audio output circuit 56 outputs the audio signal converted into the analog signal to the transmitting section 58, and the transmitting section 58 outputs the audio signal with a frequency.
It is modulated with a carrier wave of 239 [MHz] and sent to the remote commander 3. This enables the compact disk player 1
The remote commander 3 can receive the audio signal and listen to the audio signal wirelessly.

On the other hand, in addition to the control of the memory 55, the system control circuit 57 responds to the operation of the operators 8 to 16 and further based on the control data DC input via the receiving section 59. A control code is issued to each operation block, whereby the operation of the compact disk player body 2 is switched, and the display data DH is sent to the remote commander 3 via the transmitter 58. At this time, the system control circuit 57, after generating the display data DH,
The display data DH is converted into a predetermined format to generate the transmission data D1.
The transmission data D1 is NRZ-encoded using a carrier wave of 44.1 [kHz] and sent to the remote commander 3, whereby the display data DH can be efficiently transmitted.

Further, when the system control circuit 57 is set to the standby state, the reproduction mode or the ESP mode, the corresponding light emitting diodes 60 to 62 are turned on, whereby the operating state is confirmed on the compact disc player main body 2 side. It is designed to get you.

Corresponding to this, as shown in FIG. 5, the remote commander 3 is the wire 2 of the earphone forming the antenna.
In step 5, the display data and audio signal sent from the compact disk player body 2 are received, and the reception result is output to the high frequency circuit 65. Here, the high frequency circuit 65 is
The audio signal is demodulated and output to the audio processing circuit 66. The audio processing circuit 66 performs volume suppression processing and bass emphasis processing on the audio signal as necessary, and outputs the audio signal to the earphone jack 23 via the amplifier circuit 67. .

As a result, the compact disc player 1
The audio signal can be auditioned in a desired operation mode via the remote commander 3. Further, the high frequency circuit 65 is provided in the compact disc player main body 2
It receives the transmission data D1 sent from the device and outputs the reception result to the system control circuit 68.

As a result, the system control circuit 68 can detect the display data DH from the transmission data D1, drive the liquid crystal display unit 26 based on the detection result, and visually confirm the operation of the compact disk player body 2. It is done like this. Further, the system control circuit 68 detects the operation of the operating elements 18 to 24 by scanning the operating elements 18 to 24 in a predetermined cycle, and based on the detection result, the liquid crystal based on the display data DH. The display unit 26 is driven and the operation of the audio processing circuit 66 is switched.

Thereby, the compact disk player 1
Is adapted to operate the operator 24 to adjust the volume and the like, and to display the symbol 30 and the like. Further, the system control circuit 68 detects an erroneous operation of the user based on the display data DH and the operation detection result of the operators 18 to 24, and drives the tone sound generating circuit 69 as necessary, thereby the user. It is designed to attract the attention of.

Further, the system control circuit 68 controls the control data D based on the operation detection result of the operators 18-24.
C is generated and this control data DC is output to the transmitter 70. In response to this, the transmitter 70 sends the control data DC
Is subjected to NRZ encoding processing with a predetermined carrier wave and then output to the antenna 25 via the high frequency circuit 65, whereby this control data DC can be sent to the compact disc player main body 2. Thus, the compact disc player 1 can remotely control the compact disc player main body 2 by using the remote commander 3.

(2) Power Supply Circuit As shown in FIG. 6, the compact disk player body 2 has a power input terminal 71 on the side opposite to the side on which the earphone jack 13 is arranged. When a DC power supply is input from an external power supply circuit via the terminal 71, the DC power supply can be operated instead of the built-in battery . Further, the compact disk player main body 2 is configured to charge the built-in battery 72 when the DC power is input from the external power supply circuit in this way, whereby the compact disk player main body 2 drives the compact disk player main body 2. The battery 72 that operates is automatically rechargeable.

On the other hand, with respect to the battery 73 on the remote commander 3 side, the compact disc player 1 removes it from the remote commander 3 and sets it at a predetermined position of the compact disc player main body 2, and then operates the charging start operator. Thus, the compact disk player main body 2 can be charged by using the DC power supply. At this time, the compact disc player main body 2 can surely charge the battery 73 of the remote commander 3 even when the battery 73 is almost completely discharged, thereby improving the usability of the entire compact disc player 1. It is designed to be able to do.

That is, if the compact disk can be reproduced by operating the compact disc player main body 2 or the remote commander 3 as described above,
It is also possible to operate only the compact disk player body 2 side and leave the remote commander 3 unused for a long time. On the other hand, for the compact disc player body 2 side,
Whether the battery is used or not, it is possible to check the battery consumption in any case by operating the remote commander or the remote commander 3, and it is possible to automatically charge the battery by inputting DC power. Therefore, there is a feature that the frequency of being left in a state close to a complete discharge is small.

As a result, in the compact disc player body 2, the usability of the compact disc player 1 can be improved by executing the charging process corresponding to the batteries of the compact disc player body 2 and the remote commander 3. .

Here, the compact disk player body 2
In the power supply circuit 74, the DC power supplied through the terminal 71 is output to a predetermined circuit block, and when this DC power is connected, the DC power is used instead of the battery 72. It is designed to get you. Further, this DC power source is provided with a built-in battery 7 via a diode 75.
2 and is further supplied to the charging control circuit 76.

As a result, the power supply circuit 74 can start the operation of the charging control circuit 76 when the DC power supply is connected, and the charging control circuit 76 is operated by the constant current connected to the negative terminal of the battery 72. The circuit 77 is activated.
As a result, the compact disk player main body 2 can charge the battery 72 with a predetermined charging current. By monitoring the terminal voltage of the battery 72 via the differential amplifier circuit 78 during this charging, overcharge, etc. It is designed so that the accident of can be effectively avoided.

Further, when the charging current is being supplied to the battery 72, the charging control circuit 76 is adapted to turn on a predetermined light emitting diode 79, whereby the user is informed that the battery 72 is being charged. Is designed to be able to call attention to.

On the other hand, regarding the battery 73 on the remote commander 3 side, the compact disc player main body 2
When the back cover is opened and stored in the specified storage position, the battery 7
3 presses a predetermined switch 80 so that the charging control circuit 76 can detect that the battery 73 has been set to the charging position.

When the user operates the switch 81 for starting charging with the battery 73 set in the charging position in this way, the charging control circuit 76 executes a predetermined processing procedure to charge the battery 73. That is, the charge control circuit 76
A control signal for starting charging is output to the transistor 82 forming the switch circuit, whereby the transistor 82 is turned on and the constant current circuit 83 is activated.

As a result, the constant current circuit 83 generates a charging current from the DC power supply supplied via the diode 85 with reference to the terminal voltage of the current-voltage converting resistor 84 connected to the negative side of the battery 73, This charging current is supplied to the battery 73. Further the charge control circuit 76, the positive terminal of the battery 73 the diode 86 is grounded by a resistor 88 via a series circuit of the coil 87, adapted to monitor the terminal voltage of the resistor 88, thereby the battery 73 The terminal voltage can be monitored.

[0066] Thus the charging control circuit 76, the terminal voltage of the battery 73 on the basis adapted to charge the battery 73, when the terminal voltage is abnormally low, made immediately to stop supply of the charging current ing. Furthermore, the charging control circuit 76 is adapted to illuminate the light emitting diode 89 to call the user's attention while supplying the charging current to the battery 73.

The charge control circuit 76 executes the processing procedure shown in FIG. 7 and FIG. 8 to charge the battery 73, so that the battery 73 in a nearly fully discharged state can be surely charged. ing. That is, when the DC power supply is connected, the charging control circuit 76 initializes the built-in first to third timers, resets the value of the counter indicating the number of initial charges, and then moves from step SP1 to step SP2. . Here, the charge control circuit 76 uses the switch 8
It is determined whether or not the user has input a command to start charging by determining whether or not 1 is turned on. If a negative result is obtained here, step SP2 is repeated.

As a result, the charging control circuit 76 repeats the processing procedure of step SP2 until the user presses the switch 81. In response, the user switches 81
If a positive result is obtained in step SP2, the charging control circuit 76 causes the step SP2 to operate.
3, the process determines whether the switch 80 is held in the ON state or not, thereby determining whether the battery 73 is held in the charging position.

If the battery 73 is not held at the charging position, the charging control circuit 76 returns to step SP2, whereas if the battery 73 is held at the charging position,
When an affirmative result is obtained, the process proceeds to step SP4, and it is determined whether or not this battery 73 has been initially charged. Here, when the battery 73 is charged, the charge control circuit 76 first performs an initial charge to confirm the operation of the battery 73, and then executes a normal charging process for the battery that can be correctly charged.

Therefore, in this case, when a negative result is obtained in step SP4, the charge control circuit 76 moves to step SP5 to turn on the transistor 82 and turn on the light emitting diode 89. As a result, the charging control circuit 76 starts supplying the charging current to the battery 73, and then increments the first timer in the subsequent step SP6.

Further, the charge control circuit 76 detects the terminal voltage of the resistor 88 at the subsequent step SP7, and thereby the power is supplied.
It is determined whether the terminal voltage of the pond 73 is equal to or higher than a predetermined specified voltage V _{TH, and} if a positive result is obtained here, the process proceeds to step SP8, and a flag indicating the completion of initial charging is raised. Further, the charge control circuit 76 initializes the first and second timers in the subsequent step SP9, and then moves to step SP10 to execute a normal charge processing routine.

As shown in FIG. 9, in this normal charge processing routine, the charge control circuit 76 causes the step SP1
The process moves from step 1 to step SP12, and it is determined here whether the battery 73 has been forcibly charged. Here, the charge control circuit 76
In normal charging process, the beginning of the 3 minutes, after forcibly charge the battery 73 by supplying a large charging current to the battery 73, is adapted to charge the remaining by monitoring the terminal voltage of the battery 73.

As a result, the charge control circuit 76 shifts to step SP13 when a negative result is obtained in step SP12 in this case, where it increments the third timer and shifts to step SP14. Here, the charging control circuit 76 detects the third timer,
It is determined whether or not 3 minutes have passed since the forced charging was started. In this case, a negative result is obtained, and thus the process proceeds to step SP15.

As a result, the charging control circuit 76 completes this processing procedure and returns to the main routine, and step SP1
Return from 0 to step SP2. As a result, in the compact disk player 1, when the terminal voltage of the battery 73 is equal to or higher than the predetermined reference voltage V _TH at the start of charging, the normal charging process is immediately started and the forced charging of the battery 73 is started. ing.

Thus, when the charge control circuit 76 starts forced charging in this way, a positive result is obtained in steps SP2-SP3, and the process proceeds to step SP4. In this case, a positive result is obtained in step SP4. Move to step SP16. Here, the charging control circuit 76 determines whether or not the initial charging process has been performed three times or more by detecting the count value of the counter indicating the number of times of initial charging. In this case, a negative result is obtained, and thus the step control is performed. The process proceeds to SP17, and the normal charging process routine is executed again.

At this time, the charge control circuit 76 determines that the step S
The process moves from P11 to step SP12 (FIG. 9). In this case, since the charge is still held during forced charging, a negative result is obtained in step SP12, and step SP13
Move on to. Here, the charge control circuit 76 increments the third timer and then executes the processing procedure of steps SP14 to SP15 to execute steps SP17 to SP2.
Return to.

As a result, once the charge control circuit 76 starts the forced charge, the steps SP2-SP3-SP4-
SP16-SP17-SP11-SP12-SP13-
By repeating the processing procedure of SP14-SP15-SP2 and starting the forced charging for 3 minutes, a positive result is obtained in step SP14.
Then, the process proceeds to step 8 and the flag of the forced charging indicating the completion of the forced charging is set here.

Accordingly, the charge control circuit 76 then returns from step SP15 to the main routine and repeats this processing procedure, and steps SP2-SP3-SP4-SP.
After sequentially executing the processing procedure of 16-SP17-SP11, a positive result is obtained in step SP12, and the process proceeds to step SP19. Here, the charging control circuit 76 switches the operation of the constant current circuit 83 so that the value of the charging current becomes small, and then the terminal voltage of the battery 73 falls (−Δ).
(Denoted by V) is detected.

That is, as shown in FIG. 10, in this type of nickel-cadmium battery, the terminal voltage gradually rises, and the terminal voltage drops when it approaches full charge (see FIG. 10).
(A)) In this embodiment, the fall of this terminal voltage is detected and the supply of charging current is stopped. Therefore, in this case, when the negative result is obtained in step SP19, the charge control circuit 76 moves to step SP15 and returns to the main routine.

As a result, the charge control circuit 76 waits for steps SP2-SP3 until it detects the fall of the terminal voltage.
-SP4-SP16-SP17-SP11-SP12-
If the processing procedure of SP19-SP15-SP2 is repeated and a positive result is obtained at step SP19, step SP
Move to 20. Here, the charge control circuit 76 controls the stop of the supply of the charging current by switching the transistor 82 to the off state, and then proceeds to step SP21, extinguishes the light emitting diode 89 and proceeds to step SP15.

As a result, the charge control circuit 76 causes the battery 73 to
Is charged to the specified value, and when charging is completed, step SP
2-SP3-SP4-SP16-SP17-SP11-
SP12-SP19-SP20-SP21-SP15-
By repeating the processing procedure of SP2, the battery 73 that has not been discharged to a state close to full discharge can be surely charged.

On the other hand, in the case of the battery 73 that has been discharged to a state close to full discharge, the charge control circuit 76 shifts to step SP22 when a negative result is obtained in step SP7. Here, the charge control circuit 76 determines whether or not 4 seconds have elapsed after starting the initial charge based on the value of the first timer, and if a negative result is obtained here, the process returns to step SP6.

[0083] Thus the charging control circuit 76, the battery 73 is not the terminal voltage rise to a predetermined voltage _{V TH,} the loop repeats LOOP1 of step SP6-SP7-SP22-SP6, thereby to start the initial charge 4 When the terminal voltage rises to a predetermined voltage V _TH within a second, the normal charging process is performed by moving from step SP7 to step SP8, while the terminal is started 4 seconds after the initial charging is started. If the voltage does not rise to the predetermined voltage V _TH , a negative result is obtained in step SP22, and the process proceeds to step SP23.

After initializing the first timer, the charge control circuit 76 switches the transistor 82 to the OFF state in step SP24 to stop the initial charge, and in the subsequent step SP25, the counter representing the number of initial charges is displayed. Increment the value n. Further, the charge control circuit 76
At the subsequent step SP26, it is determined whether or not the initial charge has been performed three times by detecting the count value of this counter. In this case, a negative result is obtained, and the routine proceeds to step SP27.

Here, the charge control circuit 76 increments the second timer and then moves to step SP28 to determine whether 3 seconds have elapsed since the end of the initial charge based on the value of the second timer. If a negative result is obtained here, the process returns to step SP27. As a result, if the terminal voltage does not rise to the predetermined voltage V _{TH within} 4 seconds after starting the initial charging, the charge control circuit 76 proceeds to steps SP27-SP.
The loop LOOP2 of 28-SP27 is repeated to suspend charging for 3 seconds (FIGS. 10B and 10C).

When the charging is suspended for 3 seconds in this way,
When a positive result is obtained in step SP28, the charge control circuit 76 moves to step SP29, where the second timer is initialized and then returns to step SP2. As a result, the charge control circuit 76 restarts the step SP2- for the battery 73 whose terminal voltage does not rise to the predetermined voltage V _TH even after 4 seconds from the initial charge.
SP3-SP4-SP5-loop LOOP1-step SP23-SP24-SP25-SP26-loop LO
The processing procedure of OP2-step SP29-SP2 is repeated.

As a result, in the battery 73 discharged to a state close to full discharge, the terminal voltage rises and reaches the specified voltage V _TH each time this processing procedure is repeated, and a positive result is obtained in step SP7. Move to normal charging process. Therefore, in the compact disc player 1, the battery 73 discharged to a state close to the complete discharge can be charged and used, and the usability can be improved accordingly.

On the other hand, when the terminal voltage does not reach the specified voltage V _TH even after repeating this repeating process three times,
When a positive result is obtained in step SP6, the charge control circuit 76 moves to step SP30 to set an initial charging completed flag, and then moves to step SP31 where the light emitting diode 89 is blinked and displayed for a predetermined period of time. Give a warning to. That is, according to the result of the experiment, the battery 7 that can be charged and used even when completely discharged
With respect to 3, the terminal voltage can be raised to the specified voltage V _TH by repeating the initial charging process for 4 seconds three times with the rest period of 3 seconds interposed therebetween.

On the other hand, if the terminal voltage does not rise to the specified voltage V _TH even after repeating the initial charging process for 4 seconds three times with the rest period of 3 seconds interposed between them, the battery is connected to this battery. In some cases, a short circuit accident may have occurred inside,
I found it difficult to charge and use. As a result, in this embodiment, the initial charging process is repeated within a practically sufficient range, and the battery 73 discharged to a state close to complete discharge can be surely charged.

Further, in this initial charging, in this embodiment, by repeating the initial charging process for 4 seconds with a rest period of 3 seconds interposed therebetween, even if the defective battery 73 is set, liquid leakage or the like occurs. It is designed so that the accident of can be effectively avoided.

Thus, when the terminal voltage does not rise to the specified voltage V _TH even after the initial charging, the charge control circuit 76 returns from step SP31 to step SP2,
After executing the processing procedure of step SP3, step SP
4, and a positive result is obtained here, the process proceeds to step SP16. Here, the charging control circuit 76 repeats the initial charging process three times, so that the step S
P30, and in this case step SP2-S
P3-SP4-SP16-SP30-SP31-SP2
The charging procedure is stopped by repeating the above processing procedure.

This step SP2-SP3-SP4
When repeating the processing procedure of -SP16-SP30-SP31-SP2, the charge control circuit 76 starts the step SP for the first time.
When the processing procedure of step 31 is carried out, the light emitting diode is displayed in a blinking manner for a predetermined period, and when the processing procedure of step SP31 is carried out subsequently, this blinking display is stopped.

(3) Effects of the Embodiments According to the above-mentioned structure, it is possible to provide 4 seconds with a rest period of 3 seconds in between.
Repeat the initial charging process 3 times to determine whether the terminal voltage rises to the specified voltage V _TH of seconds, wherein by performing the charging process for a battery terminal voltage rises to the specified voltage V _TH, close to complete discharge Discharged to the state
The battery 73 can also be reliably charged and repeatedly used.

(4) Other Embodiments In the above embodiments, the case where the initial charging process for 4 seconds is repeated three times with the rest period of 3 seconds interposed is described, but the present invention is not limited to this. Instead, this condition can be freely set as required.

Further, in the above embodiment, the case where the initial charging process is executed for the battery of the remote commander is described, but the present invention is not limited to this, and the initial charging process is also performed for the battery of the compact disc player main body side. May be executed.

Further, in the above-mentioned embodiment, the case where the compact disc player main body 2 is controlled by the remote commander 3 has been described, but the present invention is not limited to this, and various remote control devices and various battery- operated ones can be used. It can be widely applied to electronic equipment charging devices.

[0097]

As described above, according to the present invention, the secondary battery
To the charging current for a certain period after supplying the charging current to the
Repeat the specified number of times to stop the supply,
While the operation is repeated, the terminal voltage of the secondary battery is
When the reference voltage is reached, charge the secondary battery normally.
If the secondary battery terminal voltage does not reach the reference voltage,
Can be charged if the secondary battery discharged to a state close to full discharge can be charged and used by stopping the charging of the secondary battery . (EN) A charging device capable of effectively avoiding an accident such as liquid leakage by stopping charging and thereby reliably charging a secondary battery discharged to a state close to a complete discharge. You can

[Brief description of drawings]

FIG. 1 is a perspective view showing a compact disk player according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the connection of the earphones.

FIG. 3 is a plan view showing the liquid crystal display unit.

FIG. 4 is a block diagram showing the compact disc player body.

FIG. 5 is a block diagram showing a remote commander.

FIG. 6 is a block diagram showing a power supply circuit of the compact disk player body.

FIG. 7 is a flowchart for explaining the operation.

FIG. 8 is a flow chart showing the continuation thereof.

FIG. 9 is a flow chart used to explain a normal charging operation.

FIG. 10 is a characteristic curve diagram for explaining a charging operation.

[Explanation of symbols]

1 ... Compact disk player, 2 ... Compact disk player body, 3 ... Remote commander, 5 ...
... Top cover, 26 ... Liquid crystal display section, 57, 68 ... System control circuit, 72, 73 ... Battery , 74 ... Power supply circuit, 7
6 ... Charge control circuit, 77, 83 ... Constant current circuit.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-6-269132 (JP, A) JP-A-4-168930 (JP, A) JP-A-7-298504 (JP, A) JP-A-4- 193037 (JP, A) JP-A 2-159931 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02J ^7/ 00-7/10 H01M 10/44

Claims (2)

(57) [Claims] 1.Voltage detector that detects the terminal voltage of the secondary battery
Dan, Charging current supplying means for supplying charging current to the secondary battery
When, Based on the voltage detection result, the charging current supply means
Control means for controlling the operation With In the initial charging process, the control means charges for a certain period of time.
Stop supplying charging current for a certain period after supplying current
This is repeated cyclically a specified number of times, and
Therefore, the terminal voltage of the secondary battery in the repeating range is
If it is detected that the pressure has reached the reference voltage,
Flow control means to perform normal charging to
Depending on the stage, the end of the secondary battery in the repeating range
If it is detected that the secondary voltage does not reach the reference voltage,
Stop charging of the above secondary battery by controlling the charging current supply means
Do A rechargeable battery charging device characterized by the above. 2. A charging current is supplied to a secondary battery for a certain period of time.
After that, periodically stop the supply of charging current for a certain period.
Repeat the specified number of times, and repeat the above while repeating the above operation.
If the terminal voltage of the secondary battery reaches the reference voltage,
Charge the secondary battery normally and
If the pressure does not reach the reference voltage, charge the secondary battery above.
A method for charging a secondary battery, which is characterized by stopping .