JP3001516B1 - Battery level detection circuit for mobile phones and electronic devices - Google Patents

Abstract

An object of the present invention is to accurately and accurately measure and detect a remaining amount of a battery according to a difference in type between a primary battery and a secondary battery, a difference in internal resistance of a battery, and the like. SOLUTION: In the mobile phone which can use a dry battery pack and a secondary battery pack, the internal resistance of the dry battery pack is calculated from the data of the memory in which the internal resistance of the secondary battery pack is recorded in advance. Comparing means for comparing each discharge voltage with the battery terminal voltage at the time of position registration, and judging the type of the pack based on the comparison result. Further, in the above-mentioned mobile phone, a secondary battery pack level table memory adjusted according to discharge characteristics of the dry battery pack and the secondary battery pack is provided, and a battery terminal voltage at the time of the position registration and a battery at the time of non-transmission state are provided. A battery level determination calculation circuit that determines a type of the pack based on a terminal voltage and a determination value for battery identification, and calculates a remaining amount of the pack based on a difference between the two battery terminal voltages. .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable telephone using a primary battery and a secondary battery, and a battery level detecting circuit of general electronic equipment.

[0002]

2. Description of the Related Art Conventionally, small and lightweight portable telephones are equipped with a secondary battery pack using secondary batteries such as standard lithium, hydrogen, and nickel cadmium batteries.
For the purpose of enabling use even in an emergency, some batteries are provided with a battery pack using a manganese dry battery or an alkaline dry battery as a primary battery, that is, a dry battery pack.

[0003] When the battery is consumed beyond a certain limit, the battery is put into an inoperable state or an unstable operation. Therefore, the battery is replaced or the battery is charged before the state is reached. There is a need. Therefore, Japanese Patent Application Laid-Open No. 2-218
No. 978 discloses that a current is supplied to a dummy resistor from a power-on, and a battery remaining amount is calculated and obtained according to a degree of voltage drop within a predetermined time.

However, since the discharge characteristics generally differ depending on the type of the battery, it is difficult to display the remaining amount of the battery while detecting the type of the battery.
No. 6,009,045. This publication will be described with reference to the block diagram of the battery determination device in FIG. The large current discharge circuit section 30 is configured to allow a constant current equal to or more than the current consumption of the electronic device to flow to the main battery 29. In this electronic device, a DC / DC converter 28 receives a power supply from a main battery 29, generates a power supply voltage Vcc of a certain level, and supplies it to a logic circuit 27. Press SW21 and power switch
The detection is detected by the detection unit 22, and the CPU 23 turns on the power at this time.
Occasionally, I / O access is made to the missing battery detection unit 25 and the A / D converter 26 via the I / O address decoding unit 26, and the missing or replacement of the main battery is detected by the SW 31 to detect the missing battery information data and main battery level. The data is received via the data buses D and B, and an analysis process is performed. If there is no evidence of missing batteries, the large current discharge circuit 3
It is described that the main battery 29 is discharged by 0 and the type of the battery is identified based on the amount of battery drop of the main battery due to the discharge.

As a device for estimating the remaining amount of a battery, a device for improving the accuracy of the remaining amount prediction is disclosed in Japanese Patent Laid-Open No. 6-1863.
No. 10 discloses this. This publication will be described with reference to FIG. In this publication, an ID 42 indicating the individual identification of the battery 41 and a correction value storage unit 48 for storing correction values of a temperature-dependent coefficient, a current-dependent coefficient, and a total power value corrected based on the actual usage for each ID 42. Determining means 43 for determining the ID 42 of the mounted battery 41; and a remaining amount prediction calculation for reading each correction value of the determined ID 42 from the correction value storage means 48 and calculating a remaining amount prediction value based on a predetermined formula. Means 5 are provided.

[0006] The remaining amount estimating apparatus having the above-described configuration includes a current value of the chargeable / dischargeable battery 41 detected by the current detecting means 44, a temperature value detected by the temperature detecting means 46, and an elapsed time measured by the measuring means 47. And a correction of the temperature-dependent coefficient, the current-dependent coefficient and the total power value for each ID 42 indicating the individual identification of the battery 41. The value is read out, the remaining amount of the battery is recorded in the recording means 49, and the remaining amount is displayed.

Thus, the temperature dependence coefficient, the current dependence coefficient,
The total power value is corrected based on the actual use of the battery, and the remaining amount prediction value is calculated using the corrected correction value, so that it is possible to correct errors due to individual differences and aging of the battery. It says that the accuracy of prediction can be improved.

[0008]

However, as parameters of the remaining battery level, battery type, battery operating time, reduction characteristics during actual use of the battery, temperature-dependent coefficient, current-dependent coefficient, and total power value are as follows. The remaining battery capacity is shown based on these values.However, if the primary battery and the secondary battery are different in type or if a temporarily used battery is However, there is a problem that a large error still remains in the display value of the battery remaining amount prediction.

Further, since the internal resistance of the battery differs between the standard battery of the secondary battery and the dry battery of the primary battery, the function of displaying the remaining battery level of the portable telephone adjusted by the standard battery is not provided. When the pack is used, there is also a problem that the remaining battery level is not accurately displayed, and the user cannot estimate the remaining battery level.

SUMMARY OF THE INVENTION It is an object of the present invention to accurately and accurately measure and detect the remaining amount of a battery in accordance with a difference in type between a primary battery and a secondary battery and a difference in internal resistance and the like of the battery.

[0011]

A portable telephone according to the present invention comprises:
In a mobile phone that can use a dry battery pack and a secondary battery pack, an internal resistance of the dry battery pack is calculated from data of a memory in which an internal resistance of the secondary battery pack is recorded, and a position registration is performed. Comparing means for comparing the battery terminal voltage at the time, and determining the type of the pack based on the comparison result.

[0012] In the above-mentioned portable telephone, the memory includes a dry cell pack level table memory adjusted according to a discharge characteristic of the dry cell pack, and a secondary battery pack adjusted according to a discharge characteristic of the secondary battery pack. A level table memory, the battery terminal voltage at the time of the position registration, the battery terminal voltage at the time of non-transmission state,
With the battery identification determination value, determine the type of the pack,
A battery level determination calculation circuit for calculating a remaining amount of the pack based on a difference between the two battery terminal voltages is provided.

According to another aspect of the present invention, there is provided a battery level detecting circuit of an electronic device which can use a dry battery pack and a secondary battery pack, wherein the dry battery pack level table memory adjusted by the discharge characteristics of the dry battery pack; The secondary battery pack level table memory adjusted by the discharge characteristics of the battery pack, the battery terminal voltage at the time of position registration, the battery terminal voltage at the time of non-transmission state, and the determination value for battery identification, Determining means for determining the type;
A battery level determination calculation circuit for calculating the remaining amount of the battery pack based on the difference between the two battery terminal voltages is provided.

Further, in the battery level detection circuit of the electronic device, detection means for detecting a potential difference between the power supply voltage M1 when transmission is on and power supply voltage M2 when transmission is off, and a determination of the potential difference of the detection means and battery identification. Comparing means for comparing the value J with the identification value, identification means for identifying at the time of the position registration whether the battery pack attached to the battery pack is equipped with the secondary battery pack or the dry battery pack, and Correspondingly, the battery level of the attached battery pack is calculated based on the pack level table memory.

According to the present invention, conceptually, when a battery pack is used in a portable telephone or an electronic device, the internal resistance of the battery pack is larger than that of a secondary battery pack of lithium or the like. The voltage drop was large under high load such as transmission, and the potential difference between low load and load during reception was large, shortening the usage time. It is characterized in that the pack can be detected, and the remaining amount of the battery can be easily calculated by utilizing the difference in the voltage effect.

More specifically, referring to FIG. 1, according to the present invention, a conventional battery level detection circuit 12 includes a dry battery pack level table memory 2 adjusted according to the discharge characteristics of a dry battery pack, A transmission on / off detection unit 20 for position registration that monitors the transmission on or transmission off state during registration, and a data control circuit 5 that measures the battery level based on the timing of the transmission on / off detection unit 20 for position registration.
A memory M1 (13) for recording the power supply voltage at the time of transmission ON during position registration, a memory M2 (14) for recording a power supply voltage at the time of transmission OFF, and a memory J storing a determination value for battery identification. By adding (15), the battery level determination arithmetic circuit 6 detects the potential difference between the power supply voltage M1 when the transmission is on and the power supply voltage M2 when the transmission is off using the difference in the internal resistance between the battery and the dry cell. A mobile phone characterized by automatically identifying whether a battery pack or a dry battery pack is attached at the time of location registration, and displaying an accurate remaining battery level, by comparing with a determination value J for battery identification. This is a battery level detection circuit.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments according to the present invention will be described.
This will be described in detail with reference to the drawings.

(Configuration of the Present Embodiment) An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a battery level detection circuit of a portable telephone according to a first embodiment of the present invention.

First, a description will be given of a battery level detection circuit A12 which is a configuration of a battery level detection circuit of a general portable telephone.

An A / D converter 4 for detecting a terminal voltage of a terminal 11 for connecting the battery pack 1; a battery pack level table memory 1 (10) adjusted by the discharge characteristics of the battery pack 1; And a data control circuit 5 for reading the battery pack terminal voltage data, which is the output of the battery pack 4, and comparing the battery pack terminal voltage data adjusted by the discharge characteristics of the battery pack with the contents D1 of the battery pack level table memory 1 (10). And a LC for controlling the LCD display based on the output of the battery level determination arithmetic circuit 6 for estimating the battery capacity of the battery.
A D control circuit 7, an LCD driver 8 for driving the LCD by the LCD control circuit 7, and an LCD driver 8
It has an LCD 9 driven by.

The mobile phone body 3 of the present invention performs the following configuration and functions in addition to the battery level detection circuit A12.

The battery pack level table memory 1 (1
0), a dry cell pack level table memory 2 adjusted according to the discharge characteristics of the dry cell pack 1 is provided,
A location registration transmission on / off detection unit 20 for detecting location registration transmission on / off, and an A / D when location registration transmission is on
A memory 13 for storing terminal voltage data M1 read from converter 4, and a memory 14 for storing voltage data M2 read from A / D converter 4 when position registration transmission is off.
And a battery identification memory 15 for storing a battery identification determination value J. The battery identification memory 15 performs a calculation from the stored terminal voltage data M1 and voltage data M2 to obtain a battery identification memory stored in the battery identification memory 15. A battery level determination arithmetic circuit 6 having a function of comparing with the determination value J and detecting whether the battery pack is a battery pack or a dry battery pack is provided.

(Operation of the Present Embodiment) The operation of the embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a block diagram of a battery level detection circuit of a portable telephone according to an embodiment of the present invention, and FIG. 2 is an operation flowchart of the battery level detection circuit. First, when the power of the mobile phone is turned on, the location registration is performed as a normal use state in order to clarify the existence of the mobile phone in a cell managed by the base station with respect to the base station. After detecting the position registration (S1), the transmission on / off detection unit 20 for position registration monitors the transmission state, and when the transmission on state is detected (S2), the data control circuit 5 sets the A / D converter 4 to ON.
Is operated, the battery terminal voltage 4 of the battery pack 1 is measured,
The data is stored in the memory 13 as the battery terminal voltage data M1 (S3). When the transmission on / off detection unit 20 detects the transmission off state at the time of location registration (S4), the data control circuit 5
Operates the A / D converter 4, measures the battery level, and stores it in the memory 14 as voltage data M2 (S
5). The difference between the stored voltage data M1 and M2 is calculated by the battery level determination calculation circuit 6 (S6), and is compared with the determination value J for battery identification stored in the memory 15 (S6).
7) If the difference between the voltage data M1 and M2 does not exceed the judgment value J, it is identified as a battery pack; if it does, it is identified as a dry battery pack (S8), and the identified battery table memory 10 (S8).
9) Or access the dry cell table memory 2 (S
10).

Next, the remaining amount estimation will be described. Specific data examples of the battery pack level table memory 1 and the dry cell pack level table memory 2 will be described with reference to Table 1.

For example, the battery detection level is changed from 2.5 V to 4.5 V by the A / D converter 4 to FFh (25
6), battery level display in 4 levels (level 1 to 1)
Assume the case of 4). The table is determined in consideration of the discharge characteristics of the secondary battery and the dry battery.

[0028]

[Table 1] Table memory example The values in Table 1 are respectively assigned to memory addresses in binary numbers and stored in a table format.

The power supply terminal voltage data 4A read after the battery pack identification and the battery pack level table memory 1
Contents D1 or dry battery pack level table memory 2
(S11, S12), the LCD control circuit 7 controls the LCD display, and the LCD driver 8 controls the LCD.
The remaining battery power is displayed on 9 (S13).

After the location is registered once, the terminal voltage of the battery pack is measured at the next location registration (S1).
4), selected battery pack level table memory 10
Alternatively, while accessing the dry battery pack level table memory 2 (S15), the battery level detection is repeated, the battery capacity is estimated (S16), and the remaining battery level is displayed (S17).

From Table 1, for example, it is identified that the battery pack is a secondary battery pack, and the terminal voltage at the time of transmitting the position registration is 90h-C.
In the case of A1h during 0h, the remaining amount of the secondary battery pack is predicted to be level 2 and is displayed as remaining amount level 2.

Since the power output of the transmitting unit of the portable telephone is turned on at the time of the position registration, the value indicates a value close to the discharge voltage of the battery.
In the case of reception during standby reception and non-reception during power consumption, transmission and non-transmission during a call, backlight on and off after power on etc. Can also be applied.

Subsequently, the location registration is detected at the next opportunity (S
18) The process proceeds to step S2.

In the above-described embodiment, the battery remaining amount detection circuit in the portable telephone has been described. However, the present invention is not limited to the portable telephone, but may be a general portable electronic device such as a PDA (Personal D).
digital assistants), notebook computers, liquid crystal televisions, radios, etc., can be used to detect the remaining battery level and display the remaining battery level. In that case, instead of measuring each battery terminal voltage when a large current called location registration is passed and when a maintenance current is passed during reception, a battery terminal voltage is measured when an inrush current flows when the power is turned on. It may be that.

[0035]

As described above, according to the present invention, the battery level table is prepared for both the battery pack and the dry battery pack, and whether the battery mounted on the mobile phone is a battery pack, a dry battery pack or an automatic battery pack. Therefore, even when a standard battery pack or a dry battery pack is used, it is possible to accurately display the remaining battery level by adding a simple circuit.

Also, even when the battery pack and the dry battery pack are instantaneously replaced by using the instantaneous interruption function, the reception and non-reception during standby and the transmission and non-transmission during a call are possible. Since detection is possible, it is possible to have a battery pack detection capability without erroneous recognition.

[Brief description of the drawings]

FIG. 1 is a block diagram of a battery remaining amount display device according to an embodiment of the present invention.

FIG. 2 is an operation flowchart of a battery remaining amount display device according to an embodiment of the present invention.

FIG. 3 is a block diagram of a conventional battery remaining amount display device.

FIG. 4 is a block diagram of a conventional battery remaining amount display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Battery pack 2 Dry battery pack level table memory 3 Mobile phone main body 4 A / D converter 5 Data control unit 6 Battery level judgment arithmetic circuit 7 LCD control circuit 8 LCD driver 9 LCD 10 Battery pack level table memory 11 Battery pack terminal 12 Battery level Detector 13 Memory M1 14 Memory M2 15 Memory J20 Location registration transmission ON / OFF detector

Claims (6)

(57) [Claims] 1. A portable telephone that can use both a dry battery pack and a secondary battery pack, wherein the level table memory of the dry battery pack is adjusted by the discharge characteristics of the dry battery pack and the discharge table is adjusted by the discharge characteristics of the secondary battery pack. Level table memory of the secondary battery pack, and the voltage of the battery terminal when the position is registered by mounting either the dry battery pack or the secondary battery pack, and the voltage of the battery terminal in the non-transmission state. A determination means for determining the type of a battery pack mounted on the basis of a battery identification determination value for identifying which battery pack is based on each of the voltages; Battery remaining amount display means for displaying the remaining amount of the attached battery pack based on the difference between the two voltages of the battery terminals in the transmission state. Band phone. 2. A battery level detection circuit for an electronic device that can use both a dry battery pack and a secondary battery pack, comprising: a dry battery pack level table memory adjusted according to a discharge characteristic of the dry battery pack; Secondary battery pack level table memory adjusted by discharge characteristics, battery terminal voltage at position registration,
Determining means for determining the type of mounted battery pack based on a battery terminal voltage in a non-transmission state and a determination value for battery identification; and a remaining amount of the mounted battery pack based on a difference between the two battery terminal voltages. A battery level detecting circuit for a mobile phone, comprising: a battery remaining amount display means for displaying the battery level. 3. The battery level detection circuit of a cellular phone according to claim 2, detection means for detecting a potential difference between the supply voltage M2 during transmission off the power supply voltage M1 at the time of transmission on,
Comparing means for comparing the potential difference of the detecting means with a judgment value J for battery identification; and registering the position as to whether the battery pack attached to the battery pack is equipped with the secondary battery pack or the dry battery pack. A battery level detecting circuit for a mobile phone , wherein the battery level detecting circuit displays the remaining battery level of the mounted battery pack based on the pack level table memory in accordance with the identification result. 4. A battery level detection circuit for an electronic device that can use a dry battery pack and a secondary battery pack, comprising: a dry battery pack level table memory adjusted by a discharge characteristic of the dry battery pack; and a discharge of the secondary battery pack. The secondary battery pack level table memory adjusted by the characteristics, the voltage of the battery terminal at the time of reception during standby reception, the voltage of the battery terminal at the time of non-reception, and the determination value for battery identification are attached. Determining means for determining the type of the battery pack, and displaying the remaining amount of the mounted battery pack based on the difference between the voltage of the battery terminal at the time of reception and the voltage of the battery terminal at the time of non-reception. A battery level detection circuit for a mobile phone, comprising: a battery remaining amount display circuit. 5. A battery level detection circuit for an electronic device which can use a dry battery pack and a secondary battery pack, comprising: a dry battery pack level table memory adjusted according to a discharge characteristic of the dry battery pack; and a discharge of the secondary battery pack. The secondary battery pack level table memory adjusted according to the characteristics, the battery terminal voltage during transmission during a call, the battery terminal voltage during non-transmission, and the determination value for battery identification, Determining means for determining a type; and a battery remaining amount display circuit for displaying a remaining amount of the mounted battery pack based on a difference between both battery terminal voltages of the battery terminal voltage at the time of transmission and the battery terminal voltage at the time of non-transmission. A battery level detection circuit for a mobile phone, comprising: 6. A battery level detection circuit for an electronic device that can use a dry battery pack and a secondary battery pack, comprising: a dry battery pack level table memory adjusted according to a discharge characteristic of the dry battery pack; and a discharge of the secondary battery pack. The secondary battery pack level table memory adjusted by the characteristics, the battery terminal voltage when the backlight is turned on after turning on the power, the battery terminal voltage when the backlight is turned off, and a determination value for battery identification, Determining means for determining the type of the mounted battery pack; and a difference between the two battery terminal voltages of the battery terminal voltage when the backlight is turned on and the battery terminal voltage when the backlight is turned off. A battery level detection circuit for a mobile phone, comprising a battery remaining amount display means for displaying a remaining amount.