KR100833108B1 - Apparatus and method for charging in portable terminal - Google Patents

Abstract

The present invention relates to a charging device and a method in a portable terminal, comprising: a communication unit for transmitting / receiving a wireless signal to provide communication; a power unit for charging and supplying current; and a power unit for supplying power; A request current checking unit for checking a required current amount according to the transmission signal strength (Tx power) to be supplied, and a current amount corresponding to the required current amount checked by the request current checking unit during a call during charging is set to be supplied from the charger It includes a charging current control unit, and a power management unit for controlling to receive the current of the current set by the charging current control unit from the charger to supply to the power supply unit has an effect of reducing the heat generated during the call during charging.

Charging, portable terminal, mobile communication terminal, heat generation, charging integrated circuit

Description

Charging device and method in portable terminal {APPARATUS AND METHOD FOR CHARGING IN PORTABLE TERMINAL}

1 is a circuit diagram illustrating a charging integrated circuit generally used in a portable terminal according to the prior art;

2 is a view showing the configuration of a portable terminal to reduce the heat generated by controlling to charge only the current required for the call during charging according to an embodiment of the present invention,

FIG. 3 is a circuit diagram showing a charging integrated circuit controlling to charge only a current required for a call during charging in a portable terminal according to an embodiment of the present invention;

4 is a diagram illustrating a process of reducing heat generated by controlling to charge only as much current as necessary for a call during charging in a mobile terminal according to an exemplary embodiment of the present invention.

The present invention relates to a charging device and a method in a portable terminal, and more particularly, to a device and method for charging by controlling the amount of current to be charged in order to reduce the heat generated during charging in the mobile terminal.

Recently, many portable terminals such as mobile communication terminals or personal digital assistants (PDAs) have been used. Such portable terminals are not only for the purpose of simple phone calls or schedule management but also for images by digital cameras. In addition, the range of application is increasing, such as recording a video, watching a satellite broadcast, editing a document, playing a game, navigating, listening to music, receiving a short message, and transmitting and receiving a multimedia message attached to a captured image or video.

Portable terminals have a problem of heat generation due to current consumption (typically 350 mA at medium power electric fields) during a call. In addition, the portable terminal generates heat due to the charging current when the mobile terminal is charged with the charger (TA: Travel Adapter). If the user connects the charger to charge while the battery capacity of the mobile phone is low, the heat generated by the charging operation is generated.In this case, the heat by the charge and the heat by the call are added. Fever problems can be more serious.

1 is a circuit diagram illustrating an integrated circuit (IC) generally used in a portable terminal according to the prior art.

1 is a view showing the LTC4075X chip 100 which is a charging integrated circuit used in a portable terminal of the model name SGH-ZV40. In FIG. 1, pin 1 is a USB power input pin, and pin 2 is a USB charging current control pin. , 3 pins are charging end current control pins, 4 pins are external power identification pins (low when recognized), 5 pins are charging status pins (low when charging), 6 pins are input enable Pin (TA Enable: Low, USB Enable: high), 7 pin is USB power status pin (High Impedance: USBIN detected, DCIN not detected), 8 pin is charge current control pin of charger, 9 pin is charger IC Is the current output pin of, 10 pin is the power input pin of the charger, 11 pin is the ground pin.

The amount of charging current is set by R516 connected to the IDC pin of pin 8. The amount of charging current can be calculated as shown in Equation 1 below.

I _dc = 1000 / R _idc (R516) * 10 ³ (mA)

Where I _dc is the charge current amount and R _idc is the resistance value.

Since R516 used in FIG. 1 has a resistance value of 1.8K, it can be seen that the conventional portable terminal configured as shown in FIG. 1 is set to about 550 mA when the charging current I _dc is calculated. The preset charging current amount is set above the maximum current amount used during communication so that the battery is discharged due to current consumption during communication during charging.

Then, in the portable terminal of the model name SGH-ZV40 as a result of measuring the heat generation according to the amount of charge current according to time through <Table 1>, it can be seen that the heat generation also increases as the current amount increases.

Charge time (min) Charge current amount 370 mA 500 mA 550 mA 660 mA 0 26.5 degrees 28.0 degrees 28.6 degrees 29.5 degrees 5 36.3 degrees 38.6 degrees 40.8 degrees 41.1 degrees 10 37.7 degrees 40.3 degrees 42.5 degrees 43.5 degrees 15 37.8 degrees 39.8 degrees 43.1 degrees 43.6 degrees 20 38.0 degrees 40.2 degrees 42.6 degrees 43.5 degrees 25 37.7 degrees 40.5 degrees 42.6 degrees 43.2 degrees 30 38.0 degrees 40.8 degrees 41.9 degrees 43.0 degrees

On the other hand, the portable terminal requires a different amount of required current depending on the transmission signal strength (Tx power). Therefore, there is a need for a method of reducing heat by adjusting the amount of charging current during a call during charging.

In order to solve the problems as described above, an object of the present invention is to provide a charging device and method in a portable terminal.

Another object of the present invention is to provide a charging device and a method for reducing heat generated during charging in a mobile terminal.

Another object of the present invention to provide a charging device and method for reducing the heat generated by controlling the amount of current to be charged during charging in the mobile terminal.

It is still another object of the present invention to provide a charging device and a method for reducing heat generated by controlling the portable terminal to charge only a current required for a call during charging.

According to a first aspect of the present invention for achieving the above object, a charging device in a portable terminal, a communication unit for providing communication by transmitting and receiving a wireless signal, a power supply unit for receiving the current and charging and supplying power; A request current checking unit for checking a required current amount according to a transmission signal strength (Tx power) transmitted by the communication unit during a charging call; and a corresponding current amount confirmed by the request current checking unit during a charging call. And a power management unit configured to control the amount of current to be supplied from the charger and to supply the current to the power supply by receiving the current equal to the set amount of current from the charger. .

According to a second aspect of the present invention for achieving the above objects, the charging method in the portable terminal, the process of checking the required current amount required for communication, if the sensing of the simultaneous charge and communication, and the required current amount And a process of setting to receive a corresponding amount of current, and charging and receiving the set current amount from a charger.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. If it is determined that the gist of the present invention may be unnecessarily obscured, detailed description thereof will be omitted.

The present invention relates to a charging device and a method for reducing heat generated by controlling to charge only the current required for a call during charging in the mobile terminal, the request required by the transmission signal strength (Tx power) during the call in the portable terminal The present invention relates to a charging device and a method for charging only a required amount of current in consideration of a change in amount of current. Hereinafter, the apparatus of the present invention will be described with reference to FIG. 2.

2 is a diagram illustrating a configuration of a portable terminal which reduces heat generated by controlling to charge only as much as a current required for a call during charging during a call according to an exemplary embodiment of the present invention. Referring to FIG. 2, the portable terminal of the present invention includes a control unit 200, a communication unit 202, a power supply unit 204, a charging current control unit 206, a power management unit 208, and a required current confirmation unit 210. To configure.

The communication unit 202 performs a function of despreading and channel decoding a received signal by decreasing a frequency of a radio frequency signal received through an antenna when receiving the signal, and transmitting data by channel coding channel coding, spreading, and frequency up to transmit through the antenna.

The power supply unit 204 charges the current supplied from the charger under the control of the power management unit 208 and supplies power to the portable terminal.

The required current checking unit 210 checks the required current amount according to the transmission signal strength (Tx power) transmitted from the communication unit 202 during a charging call.

The charging current control unit 206 sets the power management unit 208 to receive a preset current when charging without a call, and to the required current amount checked by the request current checking unit 210 during a charging call. The power manager 208 is set to receive a corresponding current from the charger. The amount of current corresponding to the required amount of current is a predetermined amount of current that is larger than the required amount of current as an amount of current that does not interfere with supply of the required amount of current.

The power management unit 208 receives a current equal to the amount of current set by the charging current control unit 206 from the charger during charging and controls the power supply unit 202 to be supplied.

The controller 200 controls the charging current controller 206, the power manager 208, and the required current controller 210. That is, the controller 200 may perform the functions of the charging current controller 206, the power manager 208, and the required current controller 210. In the present invention, it is shown to configure them separately to explain each function separately. Therefore, in the case of actually implementing a product, all of them may be configured to be processed by the controller 200, and only some of them may be configured to be processed by the controller 200.

Then, a circuit diagram having the LTC4075X chip of FIG. 1 according to the related art is changed to control the amount of charging current during charging during communication of the present invention as shown in FIG. 3. 3 is a circuit diagram illustrating a charging integrated circuit controlling to charge only a current required for a call during charging in a mobile terminal according to an exemplary embodiment of the present invention.

Prior to the description of FIG. 3, the consumption current according to the transmission signal strength (Tx power) in the portable terminal of the model name SGH-ZV40 using the LTC4075X chip is shown in Table 2 below.

WCDMA Tx Power (dBm) Talk Current Consumption (mA) 0 250 10 300 13 335 24 585

  In a typical field environment (the actual area used), the transmit signal strength (Tx power) does not require more than the middle power. Therefore, in the example of the present invention, the charging current is divided into two stages at the boundary of WCDMA Tx power = 13dBm.

Referring to <Table 2>, since the power consumption of the portable terminal is 335 mA when a signal is transmitted in a Tx power 13 dBm electric field, in the example of the present invention, the R _idc value has a slightly larger charging current (= 370 mA). To change.

3 is a charging current adjusting unit 206 added to the eighth pin that sets the charging current of the power management unit 208 as compared with FIG. 1, which is a conventional circuit diagram.

Then, the circuit operation of FIG. 3 is as follows. In the normal charging operation, the communication unit 202 turns on the NPN transistor Q501, which is a switch, with the CHG_CURR_CNTL signal 'high' indicating that no communication is in progress. When the switch is turned on, since R516 (= 2.7K) and R521 (= 5.6K) are connected in parallel, R _idc interlocked with the IDC pin has 1.8K, which is a parallel resistance of 2.7K and 5.6K. The charging current obtained from Equation 1 is set to 550mA.

However, when charging and a call are simultaneously performed, when the transmission signal strength (Tx power) of the current electric field of the communication unit 202 is checked and is greater than 13 dBm, the switch Q501 is turned on with the CHG_CURR_CNTL signal 'high' (turn-on). ), When less than 13dBm, the request current checking unit 210 turns off the switch Q501 by turning the CHG_CURR_CNTL signal to logic 'low' (turn-off), and when the switch Q501 is turned off, the R _idc is changed to 2.7K. The charging current obtained through Equation 1 is changed to 370 mA.

In the above embodiment, when the charging operation and the call are performed simultaneously, the transmission signal strength (Tx power) is checked at the current electric field, and when the charging signal is 13 dBm or less, the charging current is set to 370 mA, and the transmission signal strength (Tx power) is greater than 13 dBm. In the case of charging by setting the charging current to 550mA, the heat generation is improved when charging and call are performed together.

Then, when the Tx power is less than 13dBm and the present invention is applied to the portable terminal of the model name SGH-ZV40 with or without the present invention, the change in temperature over time is measured in the following <Table 3>. Same as

time  Average temperature of the handset before improvement  Average temperature of improved handset Temperature difference 0 27.4 27.3 0.1 5 40.9 39.9 1.0 10 43.1 40.7 2.4 15 44.9 42.8 2.1 20 46.0 43.2 2.8 25 46.4 43.7 2.8 30 46.8 43.8 3.0

As shown in the experimental results of Table 3, it can be seen that the amount of heat generated during communication during charging during application of the present invention is lowered by 2 to 3 degrees.

Hereinafter, a charging method in a portable terminal according to the present invention configured as described above will be described with reference to the accompanying drawings. 4 is a diagram illustrating a process of reducing heat generated by controlling to charge only as much current as necessary for a call during charging in a mobile terminal according to an exemplary embodiment of the present invention.

Referring to FIG. 4, if the portable terminal of the present invention detects the communication connection during the charging or the start of the charging during the communication in step 400, the mobile terminal proceeds to step 402 to check the required current amount required for communication. Proceeds to set up to receive a current corresponding to the required amount of current from the charger, and proceeds to step 406 to receive as much current set from the charger to charge.

Apparently, there are many ways to modify these embodiments while remaining within the scope of the claims. In other words, there may be many other ways in which the invention may be practiced without departing from the scope of the following claims.

As described above, the present invention relates to a charging device and a method by controlling to charge only the current required for a call during charging in a mobile terminal, and has an effect of reducing heat generated during a call during charging.

Claims (14)

A charging device in a portable terminal, A communication unit which transmits / receives a radio signal to provide communication; A power supply unit for charging and supplying electric current, A request current checking unit for checking a required current amount according to a transmission signal strength (Tx power) transmitted from the communication unit during a charging call; A charging current adjusting unit configured to receive an amount of current corresponding to the required amount of current checked by the required current checking unit during charging during a call; And a power management unit configured to control the charging current control unit to receive the current equal to the set current amount from the charger and supply the current to the power supply unit. The method of claim 1, The charging current adjusting unit, The charging device of the portable terminal, characterized in that for setting the power management unit to receive a predetermined amount of current when charging without communication. delete The method of claim 1, The charging current adjusting unit, The charging device according to claim 2, wherein the set current amount is classified into two stages, which are being communicated and being charged at a required current amount less than or equal to a reference value, and being being charged and being communicated at a required current amount larger than the reference value. delete delete delete In the charging method in a portable terminal, Detecting charging and communication at the same time, checking the required current amount required for communication, Setting to receive a current amount corresponding to the required current amount; And charging the battery by receiving the set current amount from a charger. The method of claim 8, If charging without communication, before charging Charging method in a portable terminal, characterized in that it further comprises the step of setting to receive a predetermined amount of current. delete The method of claim 8, The process of setting to receive the current amount corresponding to the required current amount, The method of claim 2, wherein the set current amount is classified into two stages of communication and charging at a required current amount less than or equal to a reference value and communication and charging at a required current amount greater than the reference value. delete delete delete

Images