KR20020078391A - Apparatus for power controll of mobile - Google Patents

Abstract

PURPOSE: An apparatus for controlling a power in a mobile communication terminal is provided to efficiently use the power by supplying an optimum power to the mobile communication terminal. CONSTITUTION: A power control IC(100) has a power supply terminal(VBATT) for receiving a power from a battery, an RF(Radio Frequency) transmitting/receiving terminal(RFU_PWR) connected to an MSM(Mobile Station Modem), a frequency generator signal terminal(TCXO_EN), a sleep signal terminal(SLEEP), an idle signal terminal(IDLE), and a video signal terminal(MMC_PWR). The power control IC(100) outputs the first MSM power(MSM_P), the second MSM power(MSM_A), a frequency generation power(TCXO), an RF receiving power(RF_RX), an RF transmitting power(RF_TX), the first video power(MSP_P), the second video power(MSP_A), an LED power(LED), and a logic power(LOGIC) according to a control signal outputted from the MSM.

Description

Power control device of mobile communication terminal {Apparatus for power controll of mobile}

The present invention relates to a power control device of a mobile communication terminal, and more particularly, to calculate the power of each module used in the mobile communication terminal, and then implement the optimum low drop output voltage (LDO) to save the remaining power without need. The present invention relates to a power control device of a mobile communication terminal that can be removed.

In general, the mobile communication terminal is one of the wireless communication devices that can be miniaturized to be easy to carry and are capable of making a call or exchanging data with a counterpart without being limited to a place and a distance within a radio emission distance of a base station. With the development of the Yosai industry and the pursuit of the information society, its spread as one of the important personal communication means continues to spread.

The mobile communication terminal includes a duplexer performing a duplexing function to transmit and receive a radio frequency through one antenna, an RF receiver for receiving a high frequency signal through the duplexer and converting the signal into a low frequency signal, and transmitting a low frequency signal. An RF transmitter for converting a signal into a high frequency signal and providing the duplexer to the duplexer, a baseband signal processor connected to the RF transmitter and receiver for processing a baseband signal as a baseband signal, and an audible audio signal provided by the processor BACKGROUND ART An electronic component such as a speaker which outputs as a signal is incorporated in a body (case), and is known as a device for wirelessly carrying out telephone calls. As shown in FIG. 1, a keypad 2 composed of a liquid crystal display unit 1 and various keys for supporting numbers and functions is usually installed on the front surface of the outside of the body of the mobile phone.

In addition, the mobile communication terminal uses a standardized low drop output voltage (LDO) (not shown) to supply a voltage required for each module of the terminal.

The voltages and currents required for each component of the mobile communication terminal currently in use are shown in Table 1 below.

name Used parts Required voltage Required Current MSM_P Modem, Memory 3.0 V 150 mA MSM_A Modem 2.7 V 75 mA TCXO VC_TCXO 3.0 V 10 mA RF_TX TX related parts 3.0 V 125 mA RF_RX RX Related Parts 3.0 V 75 mA MSP_P Multimedia Chip, Memoryry 3.0 V 150 mA MSP_A Multimedia Chip 2.7 V 75 mA LED LED 3.6 V 30 mA LOGIC Codec, DRAM, LCD, etc. 3.0 V 150 mA

Therefore, if you want to use the LDO in the mobile terminal currently in use, all nine are required.

However, there is a problem in that the power of all the terminals cannot be the same because there are differences in the parts used by manufacturers of each mobile communication terminal.

In addition, since it is impossible to supply all components (modules) using one LDO having a large capacity due to the characteristics of the terminal, there is a problem in that voltages must be applied separately for each component (module) even though the same voltage is used.

In order to solve the above problems, Qualcomm has introduced a chip called Power Management (PM) 1000, but when using the chip, VOD (Video On Damand) terminals have three or more LDOs in addition to the voltage supplied from the PM1000. In order to obtain the desired power from the current terminal to use more, the unnecessary parts were added to the PM1000, there was a problem that the price-performance ratio of the chip is lowered.

Accordingly, the present invention has been proposed to solve the above-mentioned problems according to the prior art, and an object of the present invention is to optimize the power of the LDO portion for supplying power to a terminal to each module of the terminal, thereby applying ASIC (Application Specific Integrated). It is to provide a power control device of a mobile communication terminal that can realize the circuit (custom type semiconductor) to reduce the area occupied by the LDOs in the terminal and maximize the power efficiency.

Features of the power control device of a mobile communication terminal according to the present invention for achieving the above object,

In a mobile communication terminal having a mobile station modem (MSM) and a battery supplied with operating power,

Power supply from battery (VBATT), RF transmitter / receiver (RFU_PWR) connected to mobile station modem (MSM), frequency generator signal (TCXO_EN), sleep signal (SLEEP), idle signal (IDLE), The first mobile station modem power (MSM_P), the second mobile station modem power (MSM_A), the frequency generating power (TCXO), and the RF receiver according to a control signal output from the mobile station modem (MSM). And a power control IC for outputting power RF_RX, RF transmission power RF_TX, first image power MSP_P, second image power MSP_A, LED power, and logic power. .

1 is a perspective view of a general mobile communication terminal,

2 is a view showing a power control device of a mobile communication terminal according to the present invention.

<Explanation of symbols for the main parts of the drawings>

100: Power Control IC

Hereinafter, a preferred embodiment of a power control device of a mobile communication terminal according to the present invention will be described with reference to the accompanying drawings.

2 is a view showing a power control device of a mobile communication terminal according to the present invention.

As shown in FIG. 2, the power control IC 100 includes a power supply terminal VBATT powered from a battery (not shown), an RF transmitter / receiver terminal (RFU_PWR) connected to a mobile station modem (MSM), and a frequency generator signal. Connected to stage TCXO_EN, sleep signal stage, idle signal stage, IDLE, video signal stage MMC_PWR, and ground terminal, and according to the control signal, the first mobile station modem power (MSM_P) and the second mobile station modem power ( MSM_A), Frequency Generation Power (TCXO), RF Reception Power (RF_RX), RF Transmission Power (RF_TX), First Video Power (MSP_P), Second Video Power (MSP_A), LED (LED) Power and Logic (LOGIC) Output power.

Therefore, the parts requiring the power supply of the mobile communication terminal are divided into nine parts and voltage is applied to nine different routes.

In fact, the basic operation of this system is the same as that of a conventional LDO.

That is, the system supplied with the main power from the battery of the terminal distributes the main power to nine kinds of LDOs, and makes power to each component (module) of the terminal by making respective voltages according to an external enable signal. It supplies and operates the part (module).

In addition, a capacitor is used to apply a stable voltage.

Capacities and enable signals of capacitors required for the respective LDOs are shown in Table 2 below.

name Enable signal name How to generate Enable signal Load Capacitor MSM_P RFU_PWR Initial power up 4.7 uF MSM_A RFU_PWR Initial power up 2.2 uF TCXO TCXO_EN FROM MODEM CHIP 0.33uF RF_TX IDLE FROM MODEM CHIP 4.7 uF RF_RX SLEEP FROM MODEM CHIP 2.2 uF MSP_P MMC_PWR FROM MODEM CHIP 4.7 uF MSP_A MMC_PWR FROM MODEM CHIP 2.2 uF LED RFU_PWR Initial power up 2.2 uF LOGIC RFU_PWR Initial power up 2.2 uF

Therefore, the power of the LDO portion for supplying power to the mobile communication terminal is optimized for each module of the terminal and implemented as an ASIC (Application Specific Integrated Circuit).

As described above, the present invention can effectively use power by supplying optimized power to a mobile communication terminal, and has an effect of significantly reducing an area occupied by components in a terminal.

Claims (1)

In a mobile communication terminal having a mobile station modem (MSM) and a battery supplied with operating power, Power supply terminal (VBATT) powered by battery, RF transmitter / receiver (RFU_PWR) connected to mobile station modem (MSM), frequency generator signal stage (TCXO_EN), sleep signal stage (SLEEP), idle signal stage (IDLE), The first mobile station modem power (MSM_P), the second mobile station modem power (MSM_A), the frequency generating power (TCXO), and the RF receiver according to a control signal output from the mobile station modem (MSM). And a power control IC that outputs power RF_RX, RF transmission power RF_TX, first image power MSP_P, second image power MSP_A, LED power, and logic power. Power control device of a mobile communication terminal characterized in that.