KR100440912B1 - Method for displaying a residual power of a battery of a portable radio communication equipment, realized by checking the amplitude of a transmission signal outputted through an auxiliary antenna - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable wireless communication device, and more particularly, to a method of displaying a remaining battery power of a portable wireless communication device in which an auxiliary antenna is provided to check an output amount at the time of transmission and thus know the remaining power of the battery.

A process of transmitting the signal to be transmitted by high frequency modulation, receiving the transmitted signal using an auxiliary antenna, amplifying the received data, comparing the amplified signal with a set reference value, and a reference value In the following case, a process of indicating a low battery message is performed, and a transmission signal is received using an auxiliary antenna, and the remaining amount of the battery can be checked by comparing its magnitude with a reference set value.

Description

How to display the battery level of a portable wireless communication device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable wireless communication device, and more particularly, to a method of displaying a remaining battery power of a portable wireless communication device in which an auxiliary antenna is provided to check an output amount at the time of transmission and thus know the remaining power of the battery.

In the field of communication, wireless communication has been rapidly developing in recent years. Telephones installed in homes are also changing from landline phones to cordless phones for the purpose of pursuing a more convenient life. Wireless telephones are increasingly used because they are easy to carry and can talk over a distance from the body of the telephone.

The conventional portable radio device is as shown in FIG. The main body 10 of the wireless device includes a button unit 11 in which a plurality of keys are arranged for selecting a phone number, and a display unit for allowing a user to visually recognize information such as a phone number or an operation state of a portable wireless device. 12 and a power supply terminal 13 that receives power for charging when mounted in the charger.

The button unit 11 includes a plurality of numeric keypads, function keys such as a power control button and a redial button, and the display unit 12 includes an LCD (Liquid Crystal Display) which is a liquid crystal display device. Indicates the result of negative pressing or other characters.

There have been a number of conventional battery charging methods. The first method is a voltage control method that checks the voltage of the charging spit and cuts off the charging current when the set voltage is reached. The second method is a time control method of setting a predetermined charging time and cutting off the charging current applied to the battery to charge after the predetermined predetermined time elapses. The third method is a temperature control method that detects the surface temperature of the battery to be charged and detects the start of overcharging when the predetermined temperature is detected. The fourth method is to operate the control circuit by the set element when the voltage of the rechargeable battery increases in proportion to the set element value by the element that sets the control value. ΔV That's the way.

In the above-described conventional battery charge control method, the voltage control method using an amplifier or a comparator inputs a reference voltage on one side of a comparator with a predetermined comparison voltage and a battery voltage on the other side. The comparator compares the input reference voltage and the voltage of the charging battery input from the charging battery, and blocks the inflow of the charging current when the voltage of the charging battery reaches the set reference voltage.

Since the above methods are well known techniques, a detailed description of each method is omitted for clarity of the present specification, and a battery charging method using the -ΔV method will be briefly described with reference to FIG. 2.

As shown in FIG. 2, a block diagram for showing a circuit configuration according to a conventional battery charging method is switched to switch the output of the DC power supply unit 31 and the DC power supply unit 32 for charging and circuit operation power supply. A part 32, a rectifying / smoothing unit 33 for rectifying and smoothing the switched power, and a switching controller 34 for controlling the switching unit 32 to perform stabilizing power output, and the rectifying and A voltage / current detection control unit 35 for detecting the smoothed power supply voltage and current, an optical coupler PT1 for supplying the detection control signal of the voltage / current detection control unit 35 to the switching control unit 34, and for charging The battery 36, the switch 37 for detecting the mounting of the battery 36, the -ΔV detector 38 for detecting the full charge step of the charging current when the switch 37 is turned on, and the switch is turned on. Voltage stabilizer 39 for supplying the operating power of the timer when According to the detection result of 38), the timer 40 performs the end of charge and the charge state display driving control, and the switch 41 and the current which are turned on / off under the control of the timer 40 to control the battery charging current. It consists of a limiting resistor (R1), LED (L2) indicating the state of charge under the control of the timer 40, and LED (L1) indicating the rectified and smoothed power supply, D1 is a diode, R0, R1, R2 and R3 are resistors.

The conventional charging method operation configured as described above is as follows.

DC power output from the DC power supply unit 31 is supplied to the switching unit 32, the switching unit 32 receives the PWM switching drive control from the switching control unit 34 to switch the input power to output AC, this output The power is rectified and stabilized by direct current at the rectifying and smoothing section.

The voltage and current of the output power are detected by the voltage / current detection control unit 35, and the detection result is fed back to the switching control unit 34 through the optical coupler PT1. PWM control of the switching part according to the fed back voltage / current ensures a stabilized power output.

As described above, since the LED L1 is turned on by the power output from the rectifying / smoothing unit 33, the power output state is displayed. On the other hand, when the battery 36 is mounted on the charger for charging, the switch 37 for detecting this is turned on. When the switch 37 is turned on, power is supplied to the voltage stabilizer 9 so that the timer 40 is powered. The timer 40 starts to operate as it is supplied.

The timer 40 is set in advance as a timer time as a time determined to be in an overcharge state while charging is continued after a predetermined time has elapsed from the start of charging. Therefore, the timer 40 outputs a high signal until the set time, and outputs a low signal when the set time comes.

When the high signal is output, the LED (L2) is turned on to indicate that it is charging, and since the switch 41 which uses this high signal as a control signal is turned on, the charging current is output (V +) of the rectifying / smoothing unit 33, Battery charging is performed by flowing through the switch 41, the diode D1, the battery 36, the resistor R0, and the output terminal V-.

At this time, the charging voltage applied to the battery 36 gradually increases with time, but gradually decreases when the battery is fully charged. Since a direct current is applied through the switch, rapid charging by a large current is performed initially. do. When the charge is continued and the full charge time is reached, the voltage level decreases thereafter. The decrease of the voltage level is detected by the -ΔV detector 38, and the detection signal is input to the timer 40.

The timer outputs a low signal when -ΔV is detected before the set time elapses. When the low signal is output in this manner, the LED L2 is turned off and the switch 41 is also turned off.

Therefore, from this point on, a small level of charging current with limited current level is flowed into the battery by the resistor R1, and when the -ΔV detector 38 fails to operate due to a circuit malfunction, as described above when the set timer time is reached. By outputting a low signal, the LED (L2) is off and the switch 41 is off to prevent damage to the battery (6) due to overcharge.

Typical wireless communication devices are powered by a power source provided from a built-in battery. When the wireless device is not in use, it is placed in a charger to charge the battery.

After using the wireless device, it may be left for a long time without being mounted on the charger. At this time, the power that is charged in the battery in the wireless device is discharged, which causes abnormal operation of the wireless device.

There is a problem that noise occurs during a call or communication is lost during a call.

The present invention has been made to solve this problem, and an object thereof is to notify a user of a wireless device so as to recognize a shortage of a battery.

Another object of the present invention is to prevent communication from being disconnected due to lack of battery.

Still another object of the present invention is to recognize a residual amount of battery by receiving a transmitted signal through an auxiliary antenna and sensing its signal size.

In order to achieve the above object, the present invention provides a process of transmitting a signal to be transmitted by performing high frequency modulation, receiving a transmitted signal using an auxiliary antenna, amplifying the received data, and amplifying a signal. And a process of comparing the set reference value with a reference value, and a process of indicating a battery low message when the reference value is less than the reference value.

1 is a perspective view of a typical portable wireless device,

2 is a battery charge control circuit according to the prior art,

3 is a flowchart illustrating a method of displaying a battery level of a portable wireless communication device according to the present invention.

Hereinafter, the configuration and operation thereof according to the present invention will be described with reference to the accompanying drawings.

3 is a flowchart illustrating a method of displaying a battery level of a portable wireless communication device according to the present invention.

High frequency modulation of the transmission target signal is transmitted using the main antenna.

The transmitted signal is received using the auxiliary antenna. It is based on the theory that the amount of battery is proportional to the amount of output during transmission (S2 process).

Amplify the received data using an amplifier. (S3 process)

Compare the amplitude of the amplified signal with the set reference value. The result of comparison is provided to A / D port of microcomputer (S4 process).

When it is determined that the output level of the transmitted signal is less than or equal to the reference value as a result of the comparison delivered to the microcomputer, a low battery message is displayed on a display unit such as an LCD (Liquid Crystal Display). In some cases, such a low battery message may be spoken (step S5).

As shown in the above description, the present invention has the effect of receiving a transmission signal using an auxiliary antenna and comparing the magnitude with a reference set value to check the remaining battery capacity.

Claims (1)

A method for displaying a battery level of a portable wireless communication device having an auxiliary antenna; Transmitting the signal to be transmitted by high frequency modulation; Receiving the transmitted signal using the auxiliary antenna, Amplifying the received data; Comparing the amplitude of the amplified signal with a set reference value, If the reference value is less than the battery level display method of a portable wireless communication device having an auxiliary antenna, characterized in that proceeds to the process of indicating a battery low message.

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