JPH0350938A - Cordless telephone system - Google Patents

Abstract

PURPOSE:To accurately manage the residual capacity of a battery of a mobile station by counting the charge/discharge current of a charging type battery of the mobile station, correction the counted value with a terminal voltage detection value and controlling the charging current or displaying a battery residual capacity with the corrected counted value. CONSTITUTION:When a mobile station 2 is in use, since circuits 10, 11, 15 for talking, radio communication and control, etc., are operated, a charging type battery 14 is worn out, a counting circuit 25 is counted down and the counted value is sent to a correction circuit 26. Moreover, a detection circuit 19 detects always the terminal voltage of the battery 14, sends the information to the circuit 26 and the counted value of the circuit 25 is corrected by a terminal voltage detected by the circuit 19 and the result is sent to the control circuit 15. The circuit 15 applies capacity management based on the corrected counted value to control a charge current control circuit 28 in the case of charging the battery 14 to control the charging current. Moreover, a display means 27 is controlled to light the LEDs of the number corresponding to the correction counted value to display the residual capacity of the battery 14 quantitatively.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a conventional technology related to a cordless telephone device.In a conventional cordless telephone device, the current for charging a rechargeable battery of a mobile station is set by a charging current control circuit. In addition, it detects the terminal voltage of the rechargeable battery, and if it detects a terminal voltage that would prevent the mobile station's electrical circuit from operating normally, it displays that information on a simple display device. The display device is usually one LED.
(light emitting diode), etc. The conventional cordless telephone device will be described below with reference to the schematic diagram of FIG. 2.

In FIG. 2, 1 is a base station connected to a telephone line 3;
2 is a mobile station connected to the base station 1 via a wireless link. The base station 1 is connected to a telephone circuit 4 connected to a telephone line 3, a radio circuit 5 for transmitting and receiving control signals such as telephone signals and connections, an antenna 6, and a power supply device 7, and is used to charge the mobile station 2, which will be described later. It is provided with a contact point 8 for supplying current for charging the rechargeable battery 14, a charging current control circuit 9, and the like. The mobile station 2 includes a communication circuit 10, a radio circuit 11 for transmitting and receiving control signals such as communication signals and connection signals, an antenna 12, a power switch 13,
A rechargeable battery 14 for power supply and a communication circuit 10. Radio circuit 1
A control circuit 15 for controlling the first battery, a charging contact 16,
It includes a transmitting line 17, a receiving line 18, a detection circuit 19 for detecting the terminal voltage of the rechargeable battery 14, and a display circuit 20 for displaying the reduced voltage of the rechargeable battery 14 based on the detection by one detection circuit. There is. Charger 21 is connected to power supply device 22,
The mobile station 2 includes a contact 23 that supplies current for charging the rechargeable battery 14 of the mobile station 2, and a charging current control circuit 24.

Next, the charging, capacity detection, and display operations of the rechargeable battery in the conventional example will be described.

By bringing the contact 16 of the mobile station 2 into contact with the contact 8 of the base station 1, for example, a charging current control circuit consisting of a single resistor etc. controls the charging current to control the rechargeable battery 1, which is a power source.
4 can be charged. When using the mobile station 2, the power switch 13 is turned ON and the communication circuit 10. When the wireless circuit 11, control circuit 15, etc. operate, the rechargeable battery 1
4 is consumed, but the terminal voltage of this rechargeable battery 14 is constantly detected by the detection circuit 19. When the detection circuit 19 detects a terminal voltage such that the rechargeable battery 14 is exhausted and the electric circuit of the mobile station 2 cannot operate normally, the detection circuit 19 sends the information to the reduced voltage display circuit 20 to display the reduced voltage.

In this way, even in the above-mentioned conventional cordless telephone device, the rechargeable battery 14 of the mobile station 2 is charged, and the rechargeable battery 1
4 consumption state can be detected.

Problems to be Solved by the Invention However, in the conventional cordless telephone device described above, the remaining capacity of the rechargeable battery 14 cannot be accurately managed.
To prevent overcharging during charging, only a safe charging current can be supplied even with continuous charging, and charging takes time.

In addition, in the above-described configuration in which the terminal voltage of the rechargeable battery 14 is detected and the reduced voltage of the rechargeable battery 14 is displayed, the state of the rechargeable battery 14 before displaying the reduced voltage is not known. While using the device, the remaining capacity of the rechargeable battery 14 may run out and suddenly become unusable.
There were issues such as inconvenience.

The present invention solves these conventional problems, and allows accurate management of the remaining capacity of a rechargeable battery for power supply in a mobile station. It can be done in a short time, prevents overcharging and overdischarging of rechargeable batteries, and extends the life of the rechargeable battery.It also allows you to quantitatively and accurately know the remaining capacity of rechargeable batteries. The present invention provides a cordless telephone device that is easy to use, and also allows for accurate remaining capacity management that compensates for the effects of variations in rechargeable batteries. It is an object of the present invention to provide a cordless telephone device that can perform the following operations even more accurately.

Means for Solving the Problems In order to achieve the above object, the present invention provides a counting means for counting charging and discharging current values of a rechargeable battery for power supply built into a mobile station, and a terminal voltage of the rechargeable battery. a detection means for detecting the current, a correction means for correcting the count value counted by the counting means based on the voltage value detected by the detection means, and a charging current controlled by the control means based on the count value corrected by the correction means. and display means for quantitatively displaying the remaining capacity of the rechargeable battery.

The mobile station also includes a counting means for counting the charging/discharging current value of a rechargeable battery for power supply built into the mobile station, a detecting means for detecting the terminal voltage of the rechargeable battery, and a voltage value detected by the detecting means. A device comprising: a correction means for correcting the count value counted by the counting means; and a display means for quantitatively displaying the remaining capacity of the rechargeable battery under the control of the control means based on the count value corrected by the correction means. It is.

Then, the correction means can correct the count value counted by the counting means by adding the temperature rise value of the rechargeable battery detected by the detection means.

Therefore, according to the present invention, the charging/discharging current value of the rechargeable battery of the mobile station is counted by the counting means, and the counted value is corrected by the correcting means based on the terminal voltage value of the rechargeable battery detected by the detecting means. Based on the corrected count value, the control means can control the charging current control means to control the charging current, or can quantitatively display the remaining capacity of the rechargeable battery on the display means.

Further, in the correction means, when correcting the count value counted by the counting means, the temperature rise value of the rechargeable battery detected by the detection means can be added to the correction.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic configuration diagram showing a cordless telephone device according to an embodiment of the present invention.

In this embodiment, the same parts as those in the conventional example described above are given the same reference numerals, and the explanation thereof will be omitted, and the different configuration will be explained. In FIG. 1, 25 is a circuit that counts the charging/discharging current value of the rechargeable battery 14, 26 is a correction circuit, and the terminal voltage of the rechargeable battery 14 detected by the detection circuit 19 is the count value counted by the counting circuit 25. The information on the corrected count value is corrected by the control circuit 15.
send to 27 is a display means, for example, a plurality of LE
D (light emitting diode), and is configured to quantitatively display the remaining capacity of the rechargeable battery 14 by the number of lit LEDs under the control of the control circuit 15 based on the count value corrected by the correction circuit 26. . 28 is a charging current control circuit that controls the charging current under control of the control circuit 15.

In the above configuration, charging of the rechargeable battery, detection of remaining capacity, and display operation will be described below.

Since the rechargeable battery 14 is charged by bringing the contact 16 of the mobile station 2 into contact with the contact 8 of the base station 1 or the contact 23 of the charger 21, the count circuit 25 counts up. On the other hand, when the mobile station 2 is used, when the power switch 13 is turned on and the communication circuit 10, radio circuit 11, control circuit 15, etc. are operated, the rechargeable battery 14 is consumed.
Count circuit 25 counts down. In this manner, the count circuit 25 counts the charging and discharging current values of the rechargeable battery 14 and sends the value to the correction circuit 26. In addition, rechargeable battery 14
The detection circuit 19 constantly detects the terminal voltage of and sends the information to the correction circuit 26. In the correction circuit 26, the count circuit 2
The count value counted in step 5 is corrected by the terminal voltage value detected by the detection circuit 19.

That is, even though the terminal voltage value detected by the detection circuit 19 is a voltage value indicating a fully charged state of the rechargeable battery 14, if the count value of the counter circuit 25 is smaller than that value, the count value is added. Even though the terminal voltage value detected by the detection circuit 19 is a voltage value indicating a reduced voltage state of the rechargeable battery 14, if the count value of the count circuit 25 is larger than that value, the count value is subtracted. Information on this corrected count value is sent to the control circuit 15. This control circuit 15 performs capacity management based on the corrected count value. That is, when charging the rechargeable battery 14, the charging current control circuit 28 is controlled to control the charging current. Therefore, since the charging current can be controlled with high precision, the rechargeable battery 14 can be charged in a short time, and overcharging can be prevented. It also controls the display means 27 to turn on the number of LEDs corresponding to the corrected count information, thereby quantitatively displaying the remaining capacity of the rechargeable battery 14. Therefore, convenience in use can be achieved.

By displaying the display circuit 27 quantitatively for a certain period of time at the start of a call, it is possible to know the remaining capacity of the rechargeable battery 14 at the start of use.

Further, when the call is continued, the wireless circuit 11, as described above,
As the call circuit 10 and control circuit 15 continue to operate, the rechargeable battery 14 is consumed, and this information is sent to the control circuit 15. Therefore, if you want to know the remaining capacity of the rechargeable battery 14 during a call, press the key switch. The control circuit 15 may be operated by the above operation, and the display means 27 may be controlled in the same manner as described above to quantitatively display the number of LEDs corresponding to the corrected count information for a certain period of time. At this time, due to use, L
The number of ED lights has decreased compared to when the call started. Further, when the number of LEDs lit is one, it is also possible to display a reduced voltage display using light or sound. Also,
By setting the display time to a constant time of about several seconds, unnecessary consumption of the rechargeable battery 14 can be prevented.

A temperature sensor as a detection means is attached to the surface of the rechargeable battery 14, and when the correction circuit 26 corrects the count value obtained by the count circuit 25 with the terminal voltage value obtained by the detection circuit 19, the temperature sensor is used as a detection means. By adding information about the temperature of the rechargeable battery 14, the outside temperature and the rechargeable battery 14
Since it is possible to manage the capacity by correcting the influence of variations in the charging current, it is possible to control the charging current and display the remaining capacity of the rechargeable battery 14 more accurately.

Effects of the Invention As described above, according to the present invention, the charging/discharging current value of the rechargeable battery of the mobile station is counted by the counting means, and the count value is used in the correction means to calculate the terminal of the rechargeable battery detected by the detecting means. Type.

The control means controls the charging current control means to control the charging current or quantitatively displays the remaining capacity of the rechargeable battery on the display means based on the corrected count value. Since the remaining capacity of the rechargeable battery can be accurately managed in this way, the charging current can be controlled with high precision when charging the rechargeable battery, and the rechargeable battery can be charged in a short time. , it is possible to prevent overcurrent and overdischarge of the rechargeable battery, thereby extending the life of the rechargeable battery. Furthermore, since it is possible to accurately and quantitatively display the information, it is possible to visually determine whether or not the rechargeable battery of the mobile station needs to be charged, thereby making it easier to use the mobile station.

In addition, in the above correction means, when correcting the count value counted by the counting means, the temperature rise value of the rechargeable battery detected by the detection means is added and corrected, thereby making it possible to accurately correct the influence of variations in the rechargeable battery. Therefore, charging current control and remaining capacity display can be performed even more accurately.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a cordless telephone device according to an embodiment of the present invention, and FIG. 2 is a schematic diagram showing a conventional cordless telephone device. 1...Base station, 2...Mobile station, 4...Telephone circuit,
5... Radio circuit, 6... Antenna, 7... Power supply device, 8... Contact, 9... Charging current control circuit, 10...
・Telephone circuit, 11...Radio circuit, 12...Antenna,
13...Power switch, 14...Rechargeable battery, 15
...control circuit, 16...contact, 17...telephone,
18...Handset, 19...Detection circuit, 21...Charger, 22...Power supply device, 23...Contact, 24...
・Charging current control circuit, 25... Count circuit, 26・
. . . Correction circuit, 27 . . . Display means, 28 . . . Charging current control circuit.

Claims (3)

[Claims] (1) A counting means for counting the charging/discharging current value of a rechargeable battery for power supply built into the mobile station, a detecting means for detecting the terminal voltage of the rechargeable battery, and a voltage value detected by the detecting means. A cordless telephone device comprising: a correction means for correcting the count value counted by the above-mentioned counting means; and a charging current control means for controlling the charging current by control of the control means based on the count value corrected by the correction means. (2) A counting means for counting the charging/discharging current value of a rechargeable battery for power supply built into the mobile station, a detecting means for detecting the terminal voltage of the rechargeable battery, and a voltage value detected by the detecting means. A correction means for correcting the count value counted by the counting means, and a display means for quantitatively displaying the remaining capacity of the rechargeable battery under the control of the control means based on the count value corrected by the correction means. Cordless telephone equipment. (3) The cordless telephone device according to claim 1 or 2, wherein the correction means corrects the count value counted by the counting means by adding the temperature rise value of the rechargeable battery detected by the detection means.