KR19990056915A - Constant Battery Power Supply in Mobile Terminal - Google Patents

Abstract

The present invention compares a supply voltage supplied from a battery with a contracted reference voltage, and based on this, the constant voltage in the mobile terminal can improve the efficiency of the supply voltage supplied to the entire apparatus by stepping up or down the battery supply voltage. A battery power supply device, comprising: a power supply unit for supplying a battery supply voltage to an apparatus, first and second resistors for voltage distribution of the supply voltage, a constant voltage diode for stepping down the supply voltage to a predetermined reference voltage, and switching A step-up converter for boosting the supply voltage to a power supply voltage according to a signal, a step-down converter for stepping down the supply voltage to a power supply voltage according to a switching signal, and a distribution voltage input to a non-inverting terminal and a reference voltage input to an inverting terminal If the divided voltage input to non-inverting terminal is higher than the reference voltage input to inverting terminal, And so drive the step-down converter, when the distribution voltage that is input to the non-inverting terminal is lower than the reference voltage input to the inverting terminal is characterized in that configured by a comparator which drives to be switched to the step-up converter.

Description

Constant Battery Power Supply in Mobile Terminal

The present invention relates to a mobile terminal, and in particular, by comparing the supply voltage supplied from a battery with a predetermined reference voltage, by increasing or decreasing the battery supply voltage based on this, it is possible to improve the efficiency of the supply voltage supplied to the entire apparatus. The present invention relates to a constant battery power supply in a mobile terminal.

Recently, with the rapid development of communication technology, a mobile terminal has been developed and utilized in which an individual can communicate with another person while moving from an arbitrary place or from one place to another.

1 is a block diagram schematically showing the internal structure of a general mobile terminal, wherein reference numeral 11 denotes an antenna for transmitting and receiving data, and 12 denotes demodulation and amplification of an RF signal received through the antenna 11. RF signal processing unit for outputting the transmission signal applied from the baseband conversion unit 13, that is, IQ signal by GMSK modulation, for example, 13 is the RF signal processing unit 12 and the digital signal processor 16 to be described later, A baseband conversion unit performs digital-to-analog conversion and analog-to-digital conversion processing on signals transmitted and received between the speaker 14 and the microphone 15.

In addition, reference numeral 14 is a speaker for outputting the voice signal received from the baseband converter 13 as an audible sound, 15 is a microphone for converting the user's voice input into an electrical signal, 16 is coding or decoding the voice signal It is a digital signal processor (DSP) that performs an equalizer to remove multipath noise and performs audio related data processing functions.

In addition, reference numeral 17 denotes a microprocessor for controlling the overall device, which controls the RF signal processing unit 12 and the DSP 16 or interleaving, block coding, and convolution for data transmitted and received. Performs coding (Convolution Coding), 18 is a Subscriber Identification Module (SIM) that stores the subscriber's registration data, 19 is a protocol software for processing the functions of the terminal and messages sent and received from the network is stored 20 is a keypad composed of numeric keys and function setting keys.

In addition, reference numeral 21 is a display unit for displaying the operation state of the terminal in liquid crystal display (LCD), 22 is a data storage unit serving as a data buffer when the terminal operating program is executed, and 23 is local information related to a telephone such as a telephone number. Is an information storage unit (E ² PROM) stored non-volatile.

That is, when the user turns on the power of the mobile terminal, the microprocessor 17 receives through the antenna 11 while sequentially increasing or decreasing the demodulation frequency of the RF signal processor 12. In addition to searching for a wireless carrier, the base station (not shown) to which it belongs is determined based on the level of each demodulated signal input.

Then, the microprocessor 17 receives the broadcasting channel (BCCH) from the base station (not shown), grasps information of the base station, and stores its subscriber in the subscription information storage unit 18 according to the LAPDm protocol. The registration procedure is performed by reading the information TMSI and transmitting it to the base station.

Then, the microprocessor 17, in the state where the registration process is completed, whether a paging channel (Paging CHannel) is received from the base station, the user operates the keypad 20 to make a transmission request (call request) to the base station, or the base station Detect whether a handover command has been received.

Therefore, when a call channel (PCH) is received, the call response to the base station is executed and the alarm signal output unit (not shown) of the mobile terminal is alerted to the user that there is a call from another terminal. When a user's transmission request is requested, the access request is executed by transmitting a random access channel (RACH) to the base station after detecting a key input from the keypad 20.

At this time, an access grant channel (AGCH) is received from the base station, or after executing a call response, the user can make a call between the user and the user of another terminal by transmitting and receiving a voice signal through the assigned time slot. do.

On the other hand, the mobile terminal receives the power supply voltage (Vcc) supplied to the overall device through the battery coupled to the mobile terminal, the battery supply voltage (V.bat) is supplied to the power supply voltage (Vcc) suitable for the overall device To boost the DC voltage of "for example + 5V" through the up converter and step down to the DC voltage of "for example + 3.6V" through the down converter, suitable for the whole device. Supply the voltage (Vcc).

Therefore, the battery supply voltage Vbat is up-converted and down-converted in order to supply a suitable power supply voltage Vcc to the entire apparatus, thereby lowering the efficiency of the battery supply voltage and causing unnecessary power consumption. do.

Accordingly, the present invention has been made in view of the above circumstances, and compares a supply voltage supplied from a battery with a contracted reference voltage, thereby switching the boost or step-down converter to be driven based on the efficiency of the supply voltage supplied from the battery. It is an object to provide a constant battery power supply in a mobile terminal that can be improved.

1 is a block diagram schematically showing the internal configuration of a general mobile terminal.

Figure 2 is a block diagram schematically showing the internal configuration of a mobile terminal having a constant battery power supply according to an embodiment of the present invention.

FIG. 3 is a circuit diagram showing an internal configuration of the switching device 32 shown in FIG.

*** Explanation of symbols for main parts of drawing ***

11: antenna, 12: RF signal processing unit,

13: baseband converter, 14: speaker,

15: microphone,

16: DSP (Digital Signal Processor), 17: microprocessor,

18: Subscriber Identity Module (SIM),

19: program storage, 20: keypad,

21: LCD display part, 22: data storage part,

23: information storage unit (E ² PROM), 31: power supply unit,

32: switching unit, 32a: up converter,

32b: Down converter, V.bat: Battery supply voltage,

Vcc: power supply voltage, R1, R2: voltage distribution resistor,

D1: constant voltage diode, A1: comparator (Op Amp).

In accordance with an aspect of the present invention, there is provided a constant battery power supply apparatus for a mobile terminal, comprising: a power supply unit supplying a supply voltage of a battery to the entire apparatus; first and second resistors for voltage distribution of the supply voltage; A constant voltage diode for stepping down a voltage to a predetermined reference voltage, a step-up converter for boosting the supply voltage to a power supply voltage according to a switching signal, a step-down converter for stepping down the supply voltage to a power supply voltage according to a switching signal, and a non-inverting terminal When the divided voltage inputted to the non-inverted terminal is higher than the reference voltage inputted to the inverted terminal, the step-down converter is driven, and the divided voltage inputted to the non-inverted terminal is inverted. When the voltage is lower than the reference voltage input to the terminal including a comparator for switching the boost converter to be driven The generated features.

That is, according to the present invention having the above-described configuration, comparing the divided voltage input to the non-inverting terminal of the comparator with the reference voltage input to the inverting terminal, if the distribution voltage is higher than the reference voltage to drive the step-down converter, the distribution voltage When the voltage is lower than the reference voltage, the boost converter is driven so as to boost or step down the supply voltage supplied from the battery to supply the power supply voltage to the entire apparatus.

Hereinafter, with reference to the accompanying drawings will be described an embodiment according to the present invention.

Figure 2 is a block diagram showing the internal configuration of a mobile terminal having a constant battery power supply according to an embodiment of the present invention, the same reference numerals for the parts performing the same function as the configuration shown in FIG. The detailed description thereof is omitted.

In the drawing, reference numeral 31 denotes a power supply unit supplying a supply voltage V.bat of a battery to the switching unit 32, which will be described later, and 32 a supply voltage V.bat supplied from a battery of the power supply unit 31. It is a switching unit for supplying the power supply voltage (Vcc) to the entire device by converting the voltage (Up) or down (Down) through the switching circuit.

Meanwhile, as illustrated in FIG. 3, the switching unit 32 includes the first and second resistors R1 and R2 and the supply voltage V.bat, which divides the supply voltage V.bat supplied from the battery. ) And a step-down converter 32b for step-up converting the supply voltage V.bat supplied from the battery and a step-down converter for step-down converting the battery supply voltage V.bat. On the basis of the reference voltage applied from the converter 32a and the constant voltage diode D1, the divided voltage is compared with the divided voltage applied through the first and second resistors R1 and R2, and the divided voltage is higher / lower than the reference voltage. Accordingly, the comparator A1 (OP AMP) switches the step-down converter 32a or the step-up converter 32b.

In addition, a supply voltage (V.bat) input terminal supplied from a battery is connected in series with the first and second resistors R1 and R2, and a comparator (B) between the connection nodes where the first and second resistors are connected in series. The non-inverting terminal (+) of A1) is connected, the battery supply voltage (Vbat) input terminal is connected to the anode of the constant voltage diode (D1), the cathode of the constant voltage diode (D1) and the inverting terminal (-) of the comparator (A1). ) Are combined.

The step-down converter 32a is connected to the + power input terminal of the comparator A1, the boost converter 32b is connected to the -power input terminal, and is configured as an output terminal Vo for outputting the power supply voltage Vcc.

The operation of the device having the above configuration will be described below.

First, when the supply voltage Vbat supplied from the battery is applied as "for example, 4V", the battery supply voltage Vbat is changed to "for example, 2V" through the first resistor R1 and the second resistor R2. The voltage is applied to the non-inverting terminal (+) of the comparator A1, and the constant voltage diode D1 connected to the inverting terminal (-) of the comparator A1 uses the battery supply voltage Vbat as the reference voltage " Step down to 1.8V "and apply it to the non-inverting terminal (-).

At this time, the comparator A1 compares the division voltage "for example, 2V" applied to the non-inverting terminal (+) based on the reference voltage "for example, 1.8V" applied to the inverting terminal (-), and the non-inverting. Since the divided voltage applied to the terminal (+) is high, the step-down converter 32a connected to the + power input terminal is driven to step down the battery supply voltage Vbat to " for example, 3.6V " to output the output terminal of the comparator A1 ( It supplies the power supply voltage (Vcc) to the whole device through Vo).

On the other hand, when the supply voltage Vbat supplied from the battery is applied to "for example, 3V", the battery supply voltage Vbat is changed to "for example, 1.5V" through the first resistor R1 and the second resistor R2. The voltage is divided and applied to the non-inverting terminal (+) of the comparator A1, and the constant voltage diode D1 connected to the inverting terminal (-) of the comparator A1 is a reference voltage " , 1.8V "is applied to the non-inverting terminal (-).

At this time, the comparator A1 is compared with the division voltage "for example, 1.5V" applied to the non-inverting terminal (+) based on the reference voltage "for example, 1.8V" applied to the inverting terminal (-). Since the divided voltage applied to the inverting terminal (+) is low, the voltage is supplied to the output terminal of the comparator A1 by boosting the battery supply voltage Vbat to " for example, 3.6V " It supplies the power supply voltage (Vcc) to the whole device through Vo).

That is, according to the embodiment described above, the divided voltage applied to the non-inverting terminal is compared based on the reference voltage input to the inverting terminal, and if the distribution voltage applied to the non-inverting terminal is higher than the reference voltage, the step-down converter is used. If it is lower, switching the boost converter to be driven enables supplying the contracted power supply voltage to the entire apparatus.

In addition, this invention is not limited to the said Example, It can variously deform and implement within the range which does not deviate from the technical summary of this invention.

As described above, according to the present invention, the mobile terminal can improve the use efficiency of the supply voltage to the battery by comparing the supply voltage supplied from the battery with a predetermined reference voltage and switching the supply voltage up or down based on this. It is possible to realize a constant battery power supply in.

Claims (2)

A power supply unit supplying the supply voltage of the battery to the entire apparatus; First and second resistors for voltage-sharing this supply voltage, A constant voltage diode for stepping down the supply voltage to a predetermined reference voltage; A boost converter for boosting the supply voltage to a power supply voltage according to a switching signal; A step-down converter for stepping down the supply voltage to a power supply voltage according to a switching signal; When the divided voltage inputted to the non-inverted terminal is higher than the reference voltage inputted to the inverted terminal by comparing the divided voltage inputted to the non-inverted terminal and the reference voltage inputted to the non-inverted terminal, the step-down converter is driven and inputted to the non-inverted terminal. And a comparator for switching the boost converter to be driven when the divided voltage is lower than the reference voltage input to the inverting terminal. The method of claim 1, The comparator includes a non-inverting terminal connected between a connection node having a first and a second resistor connected in series, and a cathode of the constant voltage diode connected to an inverting terminal. In addition, the step-down converter is coupled to the positive power supply terminal, the boost converter is coupled to the negative power supply terminal, constant battery power supply in the mobile terminal, characterized in that consisting of a power supply voltage output terminal.