KR100304610B1 - Apparatus and method for controlling power of the electric system using battery - Google Patents

Abstract

PURPOSE: An apparatus and method for controlling a power supply of a battery-used electronic equipment is provided to prevent the wrong operation of a system by preventing a shut-down mode from being converted into a normal mode owing to an applicable voltage. CONSTITUTION: The first comparator(12) compares whether the minimum voltage capable of normally operating a portable information terminal is outputted from a battery(11). In case that an output voltage of the battery(11) is going down, the first interrupt control signal is generated for converting into a shut-down mode. A microprocessor inputs the first interrupt control signal and converts a normal mode into the shut-down mode. The second comparator(13) sets a standard voltage as a standard voltage detected from an applicable voltage and a determined margin value added to a standard voltage. The second comparator(13) compares the standard voltage set-up with an output voltage of the battery(11). In case that the output voltage is higher than the standard voltage, the second interrupt control signal is generated for converting the shut-down mode into the normal mode.

Description

Apparatus and method for controlling power of the electric system using battery}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply control device and method, and more particularly, to a power supply control device and method for a battery-operated electronic device for controlling a shutdown mode of an electronic device using a battery as a supply power source.

As electronic devices become smaller or more portable, there is an increasing trend of using batteries as a supply power source. As an example, the power supply used in the portable information terminal uses a battery (primary battery or secondary rechargeable battery) due to the characteristics of the product, the battery is a discharge voltage is changed according to the magnitude of the discharge current. That is, when the discharge current is large, there is a characteristic that the discharge voltage is lower than when the discharge current is large.

In general, when the voltage of the battery falls below a predetermined constant voltage (shutdown threshold voltage) during use of the portable information terminal, the system enters the shutdown mode to shut down the system operation to protect the system.

In this shutdown mode, the discharge current is so small that the battery's discharge voltage rises above the shutdown voltage. At this time, the voltage which is raised higher than the shutdown threshold voltage is called an applied voltage. This is because the battery only has a high output voltage, but there is no current enough to actually operate the system.

According to the related art, when the user presses a switch of the portable information terminal and attempts to enter the normal mode while the applied voltage is generated, the battery voltage discharges because a large amount of current is discharged. It falls sharply below the shutdown threshold voltage. The portable information terminal then enters shutdown mode again. As a result, the portable information terminal has a problem that a malfunction may occur.

The technical problem to be solved by the present invention is to solve the above-mentioned problems, the power supply of a battery-powered electronic device that detects the occurrence of the applied voltage in the shutdown mode to prevent the malfunction of the system by ignoring the key input in the normal mode It is to provide a control device.

Another technical problem to be solved by the present invention is to solve the above-mentioned problem, and to detect the occurrence of the applied voltage in the shutdown mode, and to ignore the normal mode key input, thereby preventing malfunction of the system. It is to provide a power control method.

1 is a configuration diagram of a power supply control apparatus for a battery-operated electronic device according to the present invention.

2 is a flowchart illustrating a power control method of a battery-operated electronic device according to the present invention.

In order to achieve the above technical problem, a power supply control apparatus for an electronic device using a battery according to the present invention is a power supply control apparatus for an electronic device using a battery as a power source, and compares an output voltage of the battery with a first predetermined voltage. First comparing means for generating a first interrupt control signal when the output voltage of the battery is lower than the predetermined first set voltage, and comparing the output voltage of the battery with a predetermined second set voltage to output the battery; A second comparison means for generating a second interrupt control signal when the second interrupt control signal is lower than the predetermined second predetermined voltage; and when the first interrupt control signal is generated, the second interrupt control signal is converted into a shutdown mode. It is characterized in that it comprises a control means for switching from the shutdown mode to the normal mode only when it is generated.

In accordance with another aspect of the present invention, there is provided a method for controlling a power source of an electronic device using a battery, the method for controlling a power source of an electronic device using a battery as a power source, the output voltage of the battery and a predetermined first set voltage. A first step of comparing, a second step of converting the electronic device from the normal mode to the shutdown mode when the output voltage of the battery is lower than the predetermined first set voltage as a result of the comparison of the first step, the shutdown When the output voltage of the battery is greater than the second predetermined voltage as a result of the comparison between the third step and the third step of comparing the output voltage of the battery with the second predetermined voltage in the down mode, the electronic device And a fourth step of transitioning from the shutdown mode to the normal mode, otherwise maintaining the shutdown mode.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the power control apparatus for a battery-operated electronic device according to the present invention includes a battery 11, a first comparator 12, a second comparator 13, an MPU 14, an LCD 15, A TSP 16, a switch 17, a ROM 18, and a RAM 19 are provided.

The present invention can be applied to all electronic devices using a battery as a power supply, and will be described in detail by taking a portable information terminal as an example for convenience of description.

When the battery 11 uses the portable information terminal for a predetermined time or more, the output voltage V drops in accordance with the discharge current.

All electronic devices, including portable information terminals, must be supplied with a constant voltage to operate normally. If the power supplied falls below a certain value, the electronic device may not work or may work abnormally. Therefore, to prevent the electronic device from operating abnormally, it switches to the shutdown mode to ignore the input of an external key or switch command.

In this way, the first comparator 12 compares whether the minimum voltage V1 at which the portable information terminal can operate normally is output from the battery, and shuts down when the output voltage V of the battery falls below V1. A first interrupt control signal in which the logic value of the output voltage of the first comparator 12 is changed to generate the mode is generated.

Then, the MPU (Micro Processor Unit: 14) inputs the generated first interrupt control signal to convert from the normal mode to the shutdown mode. That is, the interrupt is interrupted with the first interrupt control signal to mask the key command input from the switch 17 or the TSP (Touch Screen Panel) 16.

However, in the shutdown mode, since the discharge current is very small, the output voltage V of the battery may be higher than the reference voltage V1 of the first comparator 12 due to the applied voltage.

Therefore, in order to prevent the converter from being converted to the normal mode due to the applied voltage, the second comparator 13 uses the reference voltage V2 of the first comparator 12 as the reference voltage V2. Compare the output voltage (V) of the battery with (). As a result of the comparison, when the output voltage V of the battery is equal to or greater than V2, a second interrupt control signal is generated in which the logic value of the output voltage of the second comparator 13 is changed in order to switch from the shutdown mode to the normal mode.

That is, the second interrupt control signal is generated only when the battery 11 is charged or when the battery is replaced with a new battery. The second interrupt control signal is not generated due to the applied voltage in the shutdown mode.

When the second interrupt control signal is generated, the MPU 14 switches from the shutdown mode to the normal mode. That is, when a key command input from the switch 17 or the TSP (Touch Screen Panel: 16) is input by interrupting the second interrupt control signal, the internal interrupt controller may be interrupted by the key command. ENABLE. Accordingly, masking for ignoring the input of the key command is released by the first interrupt control signal.

The ROM 18 and the RAMs 19 for storing various programs or data are used for storing or reading data on program execution or control operation of the MPU 14.

By the above configuration, the system can be prevented from malfunctioning due to the output voltage of the battery temporarily raised by the applied voltage in the shutdown mode.

Next, the flowchart of FIG. 2 will be described in detail with reference to FIG. 1 with respect to a power supply control method of a battery-operated electronic device according to the present invention.

As shown in FIG. 2, the power control method of the battery-operated electronic device according to the present invention includes an initial value setting step 21, a first determination step 22, a shutdown mode conversion step 23, and a second determination step. (24), an interrupt enable step 25, a third decision step 26, a fourth decision step 27, and a normal mode conversion step 28. FIG.

In the initial value setting step 21, the minimum threshold voltage value at which the system can operate normally, that is, the first threshold voltage V1 for converting the system to the shutdown mode and the system from the shutdown mode to the normal mode by the applied voltage In order to prevent the conversion, a second threshold voltage V2 having a predetermined margin value added to the first threshold voltage V1 plus a provisional voltage is set.

In the first determination step 22, the output voltage V of the battery is compared with the magnitude of the first threshold voltage V1.

In the shutdown mode conversion step 23, if the output voltage V of the battery is less than the first threshold voltage V1 as a result of the determination of the first determination step 22, the system is converted into the shutdown mode. That is, the first interrupt I1 is prevented from being applied according to the key input of the switch 17 or the TSP 16 of FIG. 1 in order to ignore an external key command by the user, and the output voltage of the battery 11 is compared. In order to prevent the second interrupt I2 from being caught by the first comparator 12, the first and second interrupts I1 and I2 are masked, and the third interrupt is enabled by the second comparator 13. Enable (I3).

In the second determination step 24, the output voltage V of the battery 11 and the magnitude of the second threshold voltage V2 are compared in the shutdown mode.

If the output voltage V of the battery 11 is greater than the second threshold voltage V2, i.e., when the battery is replaced or charged, the first, which has been masked in the shutdown mode in the interrupt enable step 25, Unmask and enable two interrupts (I1, I2).

Then, in the third judging step 26, again confirm whether the output voltage V of the battery is greater than or equal to the first threshold voltage V1, and if the output voltage V is less than the first threshold voltage V1, the shutdown mode converting step 23. It is fed back to the controller to switch back to shutdown mode.

However, when the determination result of the third determination step 26 determines that the output voltage V of the battery is equal to or greater than the first threshold voltage V1, it is determined whether the first interrupt occurs in the fourth determination step 27. That is, when a key command is input from the switch 17 or the TSP 16, a first interrupt is generated to enter the normal mode in the normal mode conversion step 28.

As described above, the system is prevented from being converted to the normal mode by the applied voltage in the shutdown mode to prevent the malfunction of the system caused by the applied voltage.

As described above, according to the present invention, by preventing the switching to the normal mode due to the applied voltage in the shutdown mode, there is an effect of preventing the malfunction of the system caused by the applied voltage.

Claims (2)

In the power supply control apparatus of the electronic device which uses a battery as a power supply, Generating a first interrupt control signal when the output voltage of the battery is lower than the first set voltage by comparing the output voltage of the battery with a first set voltage which is a minimum voltage at which the electronic device can operate normally. 1 comparing means; The second interrupt control when the output voltage of the battery is higher than the second set voltage by comparing the output voltage of the battery with the second set voltage set higher than the sum of the first set voltage and the provisional voltage in the shutdown mode. Second comparing means for generating a signal; And And controlling means for switching to a shutdown mode when the first interrupt control signal is generated and for switching from a shutdown mode to a normal mode when the second interrupt control signal is generated. Power control unit of the appliance. In a power supply control method for an electronic device using a battery as a power supply, A first step of comparing the output voltage of the battery with a first threshold voltage set to a minimum voltage value at which the electronic device can operate normally; A second step of converting the electronic device from the normal mode to the shutdown mode when the output voltage of the battery is lower than the first threshold voltage as a result of the comparison in the first step; Comparing the output voltage of the battery with the second threshold voltage set higher than the sum of the first threshold voltage and the provisional voltage in the shutdown mode; And A fourth step of converting the electronic device from the shutdown mode to the normal mode when the output voltage of the battery is greater than the second threshold voltage as a result of the comparison in the third step; otherwise, maintaining the shutdown mode. Power control method for a battery-operated electronic device characterized in that it comprises a.

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