KR20050000297A - Electronic device - Google Patents

Abstract

PURPOSE: An electronic device having a system power supply is provided to minimize power consumed by operating a power supply system of a system, and increase a use time and a life span of a battery pack. CONSTITUTION: A power selector(14) outputs a system power selection signal for turning on/off the system(10) by manipulation of a user. An MCU(Micro Controller Unit)(15) controls output of system operative power of the system power supply(11). An MCU power controller(12) controls on/off the MCU by determining the power supplied from the battery pack(1) as control power for turning on the MCU based on the system power selection signal output from the power selector. The MCU power controller includes a control power supply(12a) outputting the control power by receiving the power from the battery pack and a control power on/off circuit(12b) controlling the output of the control power of the control power supply.

Description

Electronic device {ELECTRONIC DEVICE}

The present invention relates to an electronic device, and more particularly, to an electronic device capable of minimizing power used to drive a power supply system of an electronic device and increasing the use time and life of the battery pack.

In general, electronic devices using a battery pack such as a laptop computer, a notebook computer, a portable computer such as a PDP, a CD player, a video camcorder, and the like are used in various ways because of the advantages of being portable and being used on the go. In addition, such a portable electronic device is generally provided to use a commercial AC power supply by connecting an adapter.

In particular, due to the development of computer technology, the spread of portable computers has become very high in recent years, and various methods for increasing the charging capacity and the use time of battery packs have been developed. In addition, a method for increasing the usage time while using a battery pack having the same charging capacity, that is, a method for increasing the usage time of the battery pack by using only the minimum power of the electronic device has been studied in various ways. .

1 is a control block diagram illustrating a power supply system of a conventional electronic device. As shown in the figure, a conventional electronic device includes a system unit 110 performing a function of the electronic device, a battery pack 100 and an adapter 200 for supplying power to the system unit 110, And a system power supply 111 for converting and outputting power supplied from the battery pack 100 or the adapter 200 into system driving power for driving the system unit 110.

In addition, the conventional electronic device includes a micro control unit 115 (MCU) and a micro control unit 115 that control the system power supply 111 to supply and cut off power to the system unit 110. Control power supply 112 for supplying power, and a power selection unit 114 for generating a system power selection signal in accordance with the user's operation. Here, the micro control unit 115 controls the system power supply 111 to supply and cut off power to the system unit 110 according to a system power selection signal output in response to a user's operation, thereby turning on or off the electronic device. Let's do it.

Unexplained reference numerals 121 and 122 of FIG. 1 are backflow prevention diodes for shutting off power flowing back to the adapter 200 and the battery pack 100, respectively.

However, in the power supply system of the conventional electronic device, the micro control unit 115 is always on, that is, the control power supply 112 in order to detect the system power selection signal generated from the power selection unit 114. Since the power is always maintained from the power supply, when the power is supplied from the battery pack 100, there is a problem of consuming power of the battery pack 100 regardless of the use of the electronic device. For example, even when the electronic device is turned off while the battery pack 100 is 100% charged, the battery pack is completely discharged after a predetermined time due to power consumed by the micro control unit 115. . In particular, the micro control unit 115 includes a memory such as an EEPROM that stores information on the on / off state of the electronic device. The micro control unit 115 has a relatively large power consumption, and thus the battery pack 100 Further increases power consumption.

In addition, the problem is directly connected to the frequent charging and discharging of the battery pack 100, causing a problem of reducing the life of the battery pack 100.

On the other hand, when the adapter 200 is used, the problem in the battery pack 100 as described above is not considered, but there is a problem of bringing power loss for on / off of the electronic device.

Accordingly, an object of the present invention is to provide an electronic device capable of minimizing the power consumed to drive the power supply system of the system and increasing the use time and life of the battery pack.

1 is a control block diagram of a conventional electronic device,

2 is a control block diagram of an electronic device according to the present invention;

FIG. 3 is a diagram illustrating a configuration of a control power on / off circuit unit and a power selection unit of the electronic device of FIG. 1.

4A and 4B are diagrams showing a relationship between a system power selection signal and a control power selection signal according to the present invention;

5 is a control flowchart illustrating a process of turning on an electronic device according to the present invention in a battery mode;

6 is a control flowchart illustrating a process of turning off an electronic device according to the present invention in a battery mode;

7 is a control flowchart illustrating a process of turning on an electronic device according to the present invention in an adapter mode;

8 is a control flowchart illustrating a process of turning off an electronic device according to the present invention in an adapter mode;

9 is a view showing an example of the discharge switching unit according to the present invention,

FIG. 10 is a view illustrating a part of a control block diagram of an electronic device in which an auxiliary battery according to the present invention is installed.

* Explanation of symbols for the main parts of the drawings

1: battery pack 2: adapter

10: system unit 11: system power supply unit

12: MCU power control unit 12a: control power supply unit

12b: control power on / off circuit part 14: power selection part

15: micro control unit 16: standby power supply unit

17: adapter detection unit 18: discharge switching control unit

19: discharge switch 21,22: non-return diode

According to an aspect of the present invention, there is provided an electronic apparatus including a system unit having a plurality of electronic components and a system power supply unit for outputting power supplied from a battery pack to a system driving power source for turning on the system unit. A power selection unit for outputting a system power selection signal for turning on / off the system unit according to an operation; A micro control unit (MCU) for controlling whether the system driving power is outputted from the system power supply unit; Controlling the on / off of the micro control unit by determining whether to output the control power for turning on the micro control unit with the power supplied from the battery pack based on the system power selection signal output from the power selection unit; It is achieved by an electronic device comprising a MCU power control.

Herein, the MCU power control unit receives a power from the battery pack and a control power supply for outputting the control power; The control power supply may include a control power on / off circuit for controlling whether the control power is output based on the system power selection signal output from the power selection unit.

The micro control unit may control the system power supply to output the system driving power when the control power is applied from the control power supply.

The apparatus may further include a standby power supply unit configured to output standby power for maintaining the control power on / off circuit unit and the power selection unit in an operable state.

Here, the standby power supply unit may receive power from a predetermined auxiliary battery or the battery pack and output the standby power.

When the control power is supplied from the control power supply, the micro control unit preferably outputs a latch signal for causing the control power supply to output the control power to the control power on / off circuit unit.

The control power on / off circuit unit may logically operate the system power selection signal and the latch signal to output a control power selection signal for controlling whether the control power supply is output.

The control power on / off circuit unit may output a control power selection signal for controlling the control power supply to output the control power when at least one of the system power selection signal and the latch signal has a predetermined logic value. It is preferable.

The power supply selection unit includes a first signal delay circuit unit for delaying a change time of a logic value of the system power selection signal, and the control power on / off circuit unit is responsive to a change in the logic value of the system power selection signal. And a second signal delay circuit section for delaying the change of the logic value of the changing control power supply selection signal.

Here, the control power on / off circuit section is a change time of the logic value of the control power supply selection signal delayed by the second signal delay circuit section is a change time of the logic value of the system power supply selection signal delayed by the first signal delay circuit section. When larger, it is preferable that the control power supply outputs a control power selection signal for controlling the control power to output the control power.

When the micro control unit detects a change in the logic value of the system power selection signal output from the power selection unit according to a user's operation in the on state, the control power supply unit blocks the output of the control power. It is preferable to output a latch signal.

An adapter for converting commercial AC power input from the outside into DC power and outputting the DC power to the system power supply and the control power supply; An adapter detector for detecting whether power is output from the adapter; A discharge switching unit which supplies or cuts off power supplied from the battery pack to the system power supply unit and the control power supply unit; When it is detected that the output of the power from the adapter by the adapter detection unit, it is preferable to further include a discharge switching control unit for turning off the discharge switching unit.

The adapter supplies power to the standby power supply; When the discharge switching unit is turned off, the power supplied to the standby power supply unit from the battery pack is preferably cut off.

The adapter sensing unit outputs an adapter sensing signal having a logic value corresponding to whether power is output from the adapter, and the control power on / off circuit unit outputs the system power selection signal, the latch signal, and the adapter sensing signal. It is preferable to output the control power supply selection signal by performing a logic operation.

The control power on / off circuit unit controls the control power supply to output the control power when an adapter detection signal having a logic value corresponding to the case where the adapter outputs power is detected from the adapter detection unit. It is desirable to maintain the output of the power supply selection signal.

The micro control unit receives the adapter detection signal from the adapter detection unit, and when the adapter detection signal having a logic value corresponding to the case where the adapter outputs power from the adapter detection unit is detected, the control. Preferably, the power supply unit outputs a latch signal for blocking the output of the control power to the control power on / off circuit unit.

The micro control unit may be configured to output logic of the system power selection signal output from the power selection unit in a state where an adapter detection signal having a logic value corresponding to the case where the adapter outputs power is detected from the adapter detection unit. In response to detecting a change in a value, it is preferable to control whether the system driving power is outputted from the system power supply.

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

2 is a control block diagram of an electronic device according to the present invention. As shown in the drawing, the electronic device according to the first embodiment of the present invention includes a system unit 10, a battery pack 1, a system power supply unit 11, a power selection unit 14, a micro control unit 15 (MCU: MicroControl Unit), MCU power control unit 12 is included.

The battery pack 1 supplies power required for the electronic device to the system power supply 11. Here, the battery pack 1 may be detachably provided in the system, and may be a rechargeable battery that is rechargeable by a charging unit (not shown).

The system unit 10 is composed of a plurality of electronic components that perform the main functions of the electronic device according to the present invention. For example, when the electronic device according to the present invention is a portable computer, the system unit 10 may include a system memory such as a CPU, a RAM, a graphics card, a main board, and the like. Here, the system unit 10 receives the system driving power VS from the system power supply unit 11 and drives the system driving power VS.

The system power supply unit 11 outputs the power supplied from the battery pack 1 to the system driving power VS for driving the system unit 10. Here, the system power supply unit 11 supplies or cuts off the system driving power VS supplied to the system unit 10 under the control of the micro control unit 15.

The power selector 14 outputs a system power select signal SC in accordance with a user's operation. The power selector 14 according to a preferred embodiment of the present invention outputs a system power selection signal SC of logic '0' when the user presses the power switch K, and the user outputs the power switch k. When the applied force is removed, the system power selection signal SC of logic '1' is output.

The micro control unit 15 outputs a system driving signal SM to the system power supply 11 to control whether the system driving power VS of the system power supply 11 is output. The micro control unit 15 is driven by receiving the control power VM from the control power supply 12a. Here, when the micro control unit 15 is turned off (that is, when the control power supply VM is disconnected from the control power supply unit 12a), the system power supply unit 11 cuts off the output of the system driving power supply VS. Prepared. That is, the electronic device is turned off when the micro control unit 15 is turned off.

The micro control unit 15 also outputs the latch signal SB to the control power supply on / off circuit section 12a. Here, the detailed description of the latch signal SB will be described later.

The MCU power control unit 12 controls the control power (VM) to turn on the micro control unit 15 with the power supplied from the battery pack 1 based on the system power selection signal SC output from the power selection unit 14. ) To control the on / off of the micro control unit (5). Here, the MCU power controller 12 receives the power from the battery pack 1 and outputs a control power supply 12a for outputting the control power VM, and a system power selection signal SC output from the power selector 14. And a control power on / off circuit unit 12b for controlling whether the control power supply VM outputs the control power supply VM 12a.

The control power supply 12a outputs the power supplied from the battery pack 1 to the control power VM for driving the micro control unit 15. The control power supply 12a determines whether to output the control power VM according to the control power selection signal SD applied from the control power on / off circuit 12a. Here, the control power supply 12a is preferably a low drop out regulator IC (LDO IC) such as MIC 5236 (see FIG. 10). When a logic '1' signal is applied to the enable terminal IN, the LDO IC MIC 5236 converts an input voltage applied to the input terminal IN to a predetermined voltage level through the output terminal OUT and outputs the output voltage. Therefore, the power from the battery pack 1 is input through the input terminal IN of the IC (MIC 5236), and output to the output terminal (OUT) in accordance with the drive voltage of the micro control unit 15.

The control power on / off circuit unit 12a outputs the control power selection signal SD to the control power supply unit 12a to control whether or not the control power supply VM of the control power supply unit 12a is output. Control on / off). The control power on / off circuit unit 12a according to the preferred embodiment of the present invention outputs a control power selection signal SD of logic '1' so that the control power supply 12a outputs the control power VM, and the control power supply. The supply unit 12a is provided to output a control power supply selection signal SD of logic '0' to block the control power supply VM.

Meanwhile, the electronic device according to the present invention may further include an adapter 2 for converting commercial AC power input from the outside into DC power. Accordingly, the system power supply unit 11 may receive power from any one of the adapter 2 and the battery pack 1 to output the system driving power VS. In addition, the control power supply unit 12a also receives power from either the adapter 2 or the battery pack 1 and outputs the control power VM to the micro control unit 15.

In addition, the electronic device according to the present invention may further include an adapter detector 17 detecting whether power is output from the adapter 2. The adapter detection unit 17 outputs an adapter detection signal SA having a logic value corresponding to whether power is output from the adapter 2, and the adapter detection signal SA output from the adapter detection unit 17 is The control power is transmitted to the on-off circuit unit 12a and the micro control unit 15. Here, the control power on / off circuit unit 12a may maintain the micro control unit 15 when the adapter detection signal SA of the level corresponding to the case where the power is output from the adapter 2 is detected. The control power supply 12a is controlled. In addition, the micro control unit 15 determines whether the adapter 2 is mounted by the adapter detection signal SA. When the adapter 2 detects that the adapter 2 outputs power, the adapter detection unit 17 outputs an adapter detection signal SA of logic '1', and the adapter 2 supplies power. If it is detected that the output is not output is provided to output the adapter detection signal (SA) of the logic '0.

In addition, the electronic device according to the present invention is a discharge switching unit that is turned on / off so that power is supplied to the system power supply unit 11 and the control power supply unit 12a from the battery pack 1 and the adapter detection unit 17 It is preferable to further include a discharge switching control unit 19 for controlling the on / off of the discharge switching unit in accordance with the adapter detection signal (SA) applied from. Here, the discharge switching unit is powered off from the battery pack 1 to the system power supply unit 11 and the control power supply unit 12a by turning off the discharge switching unit when the adapter detection signal SA of logic '1' is detected. Block it. As a result, when the adapter 2 outputs power, the use time of the battery pack 1 is increased by cutting off the use of the battery pack 1.

In addition, the electronic device according to the present invention outputs the power supplied from the battery pack 1 or the adapter 2 to the standby power VSb for driving the control power on / off circuit part 12a and the power selector 14. The standby power supply unit 16 may further include. As a result, the control power on / off circuit portion 12a and the power selector 14 are always kept in an on state, and the power supply selector 14 outputs the system power selection signal SC in response to an external operation of the user. The control power on / off circuit unit 12a can output the control power selection signal SD by detecting the system power selection signal SC, the adapter detection signal SA, and the like. The standby power supply is preferably an LDO IC such as the MAX1615.

Here, when the discharge switching control unit 19 turns off the discharge switching unit, it is preferable that the power supplied from the battery pack 1 to the standby power supply unit 16 is cut off. As a result, when the electronic device receives the necessary power from the adapter 2, the standby power VSb required for driving the control power on / off circuit part 12a and the power selector 14 is also supplied from the adapter 2. By doing so, it is possible to minimize the use of the battery pack (1).

Hereinafter, referring to FIG. 3, the control power on / off circuit unit 12a and the power selection unit 14 according to a preferred embodiment of the present invention will be described in detail.

The control power on / off circuit unit 12a according to the present invention includes a system power selection signal SC output from the power selection unit 14, a latch signal SB output from the micro control unit 15, and an adapter detection unit 17. And a logic operation circuit unit 12b 'that performs a logic operation on the adapter detection signal SA output from The logic operation circuit part 12b 'performs a logic operation on the system power selection signal SC, the latch signal SB, and the adapter detection signal SA to control whether the control power supply 12a outputs the control power VM. Outputs a control power supply selection signal SD. Here, the logic operation circuit unit 12b 'according to the preferred embodiment of the present invention has a logic when the adapter detection signal SA is high or one of the system power selection signal SC and the latch signal SB is low. A control power supply selection signal SD of '1' is provided. According to a preferred embodiment of the present invention, the logic operation circuit part 12b 'includes a NOT-gate N1 for inverting the logic value of the latch signal SB, a signal output from the OR-gate N1, and an adapter sensing signal ( OR-gate U1 for performing logical sum operation of SA), NOT-gate N2 for inverting the logic value of the system power supply selection signal SC, OR-gate U1 and NOT-gate N2. OR-gate (U2) for performing an OR operation on the signal output from the.

On the other hand, the power selector 14, as shown in Figure 3, the first signal delay circuit for delaying the output of the system power selection signal SC of the logic '1' from when the user's operation is removed (14b). Here, the first signal delay circuit part 14b may include a resistor R1, a capacitor C1, and a diode D1. The resistor R1 and the capacitor C1 are pressed by the power switch K and the system power selection signal SC drops to a logic '0'. After the power is controlled from the power switch K, the system power selection signal SC Delays switching back to logic '1'. Diode D1 prevents reverse flow of current.

In addition, the control power on / off circuit unit 12a is configured to delay the output of the control power control signal SM of logic '1' from when the system power selection signal SC of logic '0' is detected. Delay circuit section 12b ". Here, the second signal delay circuit part 12b ″ may include a resistor R2, a capacitor C2, and a diode D2. The resistor R2 and the capacitor C2 delay the switching of the control power supply selection signal SD from logic '0' to logic '1', and the diode D2 prevents reverse flow of current. As a result, the control power on / off circuit portion 12a adds the sum of the user's operation time to the power selector 14 and the time delayed by the first signal delay circuit portion 14b to the second signal delay circuit portion 12b ''. If the delay time is greater than the delay time, the control power source selection signal SD of logic '1' is output. 4A shows that the control power on / off circuit part 12a is a sum of the operation time a of the user with respect to the power selector 14 and the time c delayed by the first signal delay circuit part 14b. FIG. 2 shows the change of the logic value with time of the system power source selection signal SC and the control power source selection signal SD when the time delayed by the two signal delay circuit section 12b " As shown in the figure, when the system power selection signal SC drops to a logic '0' according to the user's operation, the control power selection signal SD is gradually logic'd by the second signal delay circuit section 12b ''. Increase toward 1 ' At this time, when the user's operation is removed from the power source selection unit 14, the system power source selection signal SC is gradually increased toward the logic '1' by the first signal delay circuit unit 14b. Until it reaches the threshold value recognized as '1', it is recognized as a logic '0', so that the control power supply selection signal SD continues to increase toward the logic '1'. However, when the time b delayed by the first signal delay circuit section 14b has elapsed and the system power supply selection signal SC is switched to logic '1', the second signal delay circuit section 12b " When the delayed time d does not elapse, the control power source selection signal SD does not switch to logic '1' but decreases toward logic '0' to maintain logic '0'. Accordingly, the control power supply on / off circuit unit 12a does not switch the control power supply selection signal SD to the logic '1' even when the switching on / off signal is switched to logic '0'. On the other hand, as shown in FIG. 4B, when the user operates the power selector 14 for a sufficient time a ', the switching on / off signal drops to logic' 0 'and then switches back to logic' 1 '. Time c ', that is, the sum c' of the operation time a 'of the user with respect to the power selector 14 and the time b' delayed by the first signal delay circuit section 14b. It becomes larger than the time d delayed by the two signal delay circuit section 12b ", so that the control power on / off circuit section 12a outputs the control power supply selection signal SD of logic '1'.

Hereinafter, a process of turning on / off the electronic device according to the present invention will be described with reference to FIGS. 5 to 8. Here, the case where the electronic device uses the power from the battery pack 1 is arbitrarily defined as a battery mode, and the case where the power source from the adapter 2 is used is arbitrarily defined as the adapter mode.

First, a process of turning on the electronic device in the battery mode will be described with reference to FIG. 5.

When the user mounts the battery pack 1 in the electronic device (S10), it is determined whether power is supplied from the battery pack 1 according to whether or not the adapter mode is present (S11). That is, as described above, when power is supplied from the adapter 2, the discharge switching control unit 19 turns off the discharge switching unit to cut off the power supplied from the battery pack 1 to the electronic device, and the adapter 2 Since the necessary power is supplied from the furnace, no power is supplied from the battery. That is, the electronic device is operating in the adapter mode (A).

On the other hand, when no power is supplied from the adapter 2, that is, when the discharge switching unit is in an on state, that is, in the battery mode (S12), the system power supply unit 11 and the control power supply unit from the mounted battery 12a) and standby power supply unit 16 are supplied with power.

Then, the standby power supply unit 16 supplied with power from the battery outputs the standby power supply Vsb (S13), and the output standby power supply Vsb outputs the control power on / off circuit unit 12a and the power selector 14. ) Is supplied (S14) to turn on the control power on / off circuit portion 12a and the power selector 14 to maintain a driveable state.

At this time, when the user operates the power selector 14 (S15), the power selector 14 outputs a system power select signal SC of logic '0' (S16), and the power selector 14 The system power supply selection signal SC of logic '0' outputted from the " At this time, the adapter detection unit 17 outputs an adapter detection signal SA of logic '0' because the adapter 2 does not output power. In addition, the latch signal SB from the micro control unit 15 is recognized as a logic '1'. Therefore, the control power source selection signal SD output from the control power source on / off circuit unit 12a has a state determined according to the logic value of the system power source selection signal SC.

Here, the control power on / off circuit section 12a is added to the sum of the user's operation time for the power selection section 14 and the time delayed by the first signal delay circuit section 14b and the second signal delay circuit section 12b ''. By comparing the delayed time (S17), the control power on / off circuit portion 12a determines that the sum of the user's operation time with respect to the power selector 14 and the time delayed by the first signal delay circuit portion 14b is the second signal delay. When the time delayed by the circuit unit 12b '' is large, the control power supply selection signal SD outputted is switched to a logic '1' and outputted (S18), and the control power on / off circuit unit 12a is a power source selector 14 If the sum of the user's operation time and the time delayed by the first signal delay circuit portion 14b is delayed by the second signal delay circuit portion 12b '', the control power source selection signal SD is logic '. Keep it at 0 '.

Here, when the control power supply selection signal SD of logic '1' is output from the control power on / off circuit unit 12a, the control power supply 12a outputs the control power VM to the micro control unit 15. (S19), the micro control unit 15 is turned on and initialized by the control power supply VM (S20).

Next, in the initialization step, the micro control unit 15 turns on the electronic device by controlling the system power supply unit 11 to output the system driving power VS to the system unit 10 (S23).

In addition, the micro-control unit 15 applies a latch signal SB of logic '0' to the control power supply ON / OFF circuit unit 12a (S21), and the control power supply ON / OFF circuit unit 12a is logic. By the latch signal SB of '0', the control power supply VM is maintained at a logic '1'. Accordingly, even if the user's manipulation to the power source selection unit 14 is removed and the system power source selection signal SC is switched to logic '1', the control power source selection signal SD is maintained at logic '1'.

Meanwhile, a process of turning off the electronic device in the battery mode will be described with reference to FIG. 6.

First, when the electronic device is turned on in the battery mode, the adapter detection signal SA applied to the control power on / off circuit unit 12a is logic '0' and the system power selection signal SC is logic '1'. The latch signal SB is a logic '0' and the control power supply selection signal SD is a logic '1'. That is, the control power supply selection signal SD is in a state of holding logic '1' by the latch signal SB (S31).

At this time, when the user manipulates the power selector 14 to turn off the electronic device, the power selector 14 switches the system power select signal SC to a logic '0' and outputs the signal (S32). Next, the micro control unit 15 detects the system power selection signal SC which is switched to logic '0', and switches the latch signal SB to logic '1' (S33).

Next, the control power on / off circuit unit 12a detects the latch signal SB switched to logic '1' and the system power select signal SC switched to logic '0'. At this time, when the user's manipulation to the power selection unit 14 is removed and the system power selection signal SC is switched back to logic '1', the control power on / off circuit unit 12a controls the control power selection signal SD. Is converted to logic '0' and output (S34).

Next, when the control power selection signal SD switched to logic '0' is applied to the control power supply 12a, the control power supply 12a blocks the control power VM output to the micro control unit 15. (S35), the micro control unit 15 is turned off (S36). Then, the system power supply unit 11 turns off the system unit by cutting off the system driving power VS output to the system unit 10 as the micro control unit 15 is turned off (S37).

Meanwhile, a process of turning on the electronic device in the adapter mode will be described with reference to FIG. 7.

First, when the user mounts the adapter 2 to the electronic device (S40) and the power is output from the adapter 2, the adapter detection unit 17 detects this and the adapter detection signal SA of logic '1' is detected. Outputs (S41).

Next, the discharge switching control unit 19 detects the adapter detection signal SA of logic '1' output from the adapter detection unit 17 and turns off the discharge switching unit (S41). Thus, when the adapter 2 is mounted in the battery mode and power is output, the use of the battery pack 1 can be interrupted by cutting off the power supply from the battery pack 1. In addition, even when the user mounts the battery pack 1 in the adapter mode, it is possible to block the use of the battery pack 1.

On the other hand, the power output from the adapter 2 is applied to the standby power supply unit 16, the standby power supply unit 16 supplies the standby power VSb to the control power on-off circuit unit 12a and the power selector 14. Output (S42, S43).

Next, the control power on / off circuit unit 12a detects the adapter detection signal SA of logic '1' and outputs the control power selection signal SD of logic '1' (S44). In this case, the latch signal SB input to the control power on / off circuit unit 12a may be a logic '1' or '0'.

Next, the control power supply 12a outputs the control power selection signal SD to the micro control unit 15 in accordance with the control power selection signal SD of logic '1' applied from the control power on / off circuit 12a. (S45), the micro control unit 15 is turned on and initialized according to the control power supply (VM) (S46).

At this time, the micro control unit 15 recognizes the adapter mode by the adapter detection signal SA of logic '1' output from the adapter detection unit 17, and recognizes the latch signal SB of logic '1'. Output it (S47). As a result, each signal input to the control power supply ON / OFF circuit unit 12a has an adapter detection signal SA of logic '1', the latch signal SB of logic '1', and the system power selection signal SC of logic '. 1 'is maintained. Accordingly, the control power selection signal SD output from the control power on / off circuit unit 12a detects the adapter of logic '1' regardless of the change of the logic value of the latch signal SB or the system power selection signal SC. The signal SA is maintained at logic '1', whereby the micro control unit 15 always remains on when in adapter mode.

On the other hand, the on and off of the electronic device in the adapter mode, as shown in Figs. 7 and 8, the micro-control unit 15 is switched to a logic '0' according to the user's operation of the power selection unit 14 It is performed by controlling the system power supply unit 11 to output or cut off the system driving power supply VS by sensing the system power selection signal SC. That is, in the adapter mode, the system power selection signal SC applied to the control power on / off circuit portion 12a is a logic value of the control power VM output from the control power on / off circuit portion 12a as described above. The micro control unit 15 detects the system power selection signal SC to determine the on and off of the electronic device. For example, when it is detected that the system power selection signal SC is switched to a logic '0' while the electronic device is off (see Fig. 7, S48), the micro control unit 15 turns on the electronic device (Fig. 7). (See S49 and S50), when it is detected that the system power selection signal SC is switched to a logic '0' while the electronic device is turned on (see FIGS. 8 and S61), the micro control unit 15 switches the electronic device. It turns off (refer FIG. 8, S62, S63).

Meanwhile, the electronic device according to the present invention may further include backflow prevention diodes 21 and 22 to cut off power backflowed to the adapter 2 and the battery pack 1, respectively (see FIGS. 2 and 9). . Here, as shown in FIG. 9, the non-return diode 22 which blocks the power flowing back to the battery pack 1 may be provided as one component of the discharge switching unit.

In the above-described embodiment, a preferred embodiment of the logic values of the system power selection signal SC, the latch signal SB, the adapter detection signal SA, and the control power selection signal SD is provided for the understanding of the present invention. For example, the logic value of each signal may be expressed differently. For example, the power selection unit 14 is provided to output the system power selection signal SC of logic '1' in response to a user's operation, and thus the control power on / off circuit unit 12a is also the system power selection signal SC. May be provided to output the control power supply selection signal SD of logic '1'.

In the above-described embodiment and FIG. 2, although the electronic device according to the present invention is configured to receive power from the battery pack 1 and the adapter 2, the adapter 2 may be removed. In this case, it is a matter of course that the adapter detecting unit 17, the discharge switching control unit 19 and the discharge switching unit for the detection of the adapter 2 or can be removed.

In addition, in the above-described embodiment, the standby power supply unit receives power from the battery pack or the adapter and outputs standby power. However, as shown in FIG. 10, standby power is supplied by receiving power from a separate auxiliary battery. Of course, it can be arranged to output. As an example of an auxiliary battery, when the electronic device according to the present invention is a portable computer, a bridge is used to prevent data loss by preventing the discharge of the RAM when the battery pack is replaced in the standby mode (S3, S4 mode) and to prevent data loss. It is preferable that it is a battery.

In FIG. 10, reference numerals 23 and 24 are diodes for preventing the reverse flow of current.

As such, the power selection unit 14 outputting the system power selection signal SC for turning on / off the system unit 10 and the system driving power supply VS of the system power supply unit 11 are controlled. A control power supply unit 12a for outputting the power supplied from the battery pack 1 to the control power supply VM for driving the micro control unit 15, and a system power selection signal ( By supplying a control power on / off circuit unit 12a for controlling the on / off of the micro control unit 15 by controlling whether or not the control power supply VM is output from the control power supply unit 12a according to SC). The present invention relates to an electronic device capable of minimizing power used to drive the battery and increasing the use time and life of the battery pack 1.

As described above, according to the present invention, there is provided an electronic device capable of minimizing the power used to drive the power supply system of the electronic device and increasing the use time and life of the battery pack.

Claims (17)

An electronic device having a system unit having a plurality of electronic components, and a system power supply unit for outputting power supplied from a battery pack to a system driving power source for turning on the system unit. A power selection unit for outputting a system power selection signal for turning on / off the system unit according to a user's operation; A micro control unit (MCU) for controlling whether the system driving power is outputted from the system power supply unit; Controlling the on / off of the micro control unit by determining whether to output the control power for turning on the micro control unit with the power supplied from the battery pack based on the system power selection signal output from the power selection unit; An electronic device comprising a MCU power control unit for controlling. The method of claim 1, The MCU power control unit receives a power from the battery pack and a control power supply for outputting the control power; And a control power on / off circuit unit for controlling whether the control power is output from the control power supply based on the system power selection signal output from the power selection unit. The method of claim 2, And the micro control unit controls the system power supply to output the system driving power when the control power is applied from the control power supply. The method of claim 2, And a standby power supply unit configured to output standby power for maintaining the control power on / off circuit unit and the power selection unit in an operable state. The method of claim 4, wherein The standby power supply unit receives power from a predetermined auxiliary battery or the battery pack and outputs the standby power. The method of claim 2, The micro control unit outputs a latch signal for causing the control power supply to output the control power to the control power on / off circuit unit when the control power is supplied from the control power supply. . The method of claim 6, And the control power on / off circuit unit performs a logic operation on the system power selection signal and the latch signal to output a control power selection signal for controlling whether the control power supply is output. The method of claim 7, wherein The control power on / off circuit unit outputs a control power selection signal for controlling the control power supply to output the control power when at least one of the system power selection signal and the latch signal has a predetermined logic value. Electronic device. The method of claim 8, The power selector includes a first signal delay circuit to delay a change time of a logic value of the system power select signal. And the control power on / off circuit section includes a second signal delay circuit section for delaying a change in the logic value of the control power selection signal that changes in response to a change in the logic value of the system power selection signal. The method of claim 9, The control power on / off circuit portion has a change time of the logic value of the system power selection signal delayed by the first signal delay circuit portion greater than the change time of the logic value of the control power selection signal delayed by the second signal delay circuit portion. The control power supply outputs a control power selection signal for controlling the control power to output the control power. The method of claim 6, The micro control unit latches the control power supply to block the output of the control power when a change in the logic value of the system power selection signal output from the power selection unit is detected according to a user's operation in the on state. An electronic device, characterized in that for outputting a signal. The method of claim 6, An adapter for converting commercial AC power input from the outside into DC power and outputting the DC power to the system power supply and the control power supply; An adapter detector for detecting whether power is output from the adapter; A discharge switching unit which supplies or cuts off power supplied from the battery pack to the system power supply unit and the control power supply unit; And a discharge switching control unit for turning off the discharge switching unit when it is sensed that the output of the power from the adapter is detected by the adapter detecting unit. The method of claim 12, The adapter supplies power to the standby power supply; And when the discharge switching unit is turned off, power supplied to the standby power supply unit from the battery pack is cut off. The method of claim 12, The adapter detection unit outputs an adapter detection signal having a logic value corresponding to whether power is output from the adapter, And the control power on / off circuit unit outputs the control power selection signal by performing a logical operation on the system power selection signal, the latch signal, and the adapter detection signal. The method of claim 14, The control power on / off circuit unit selects a control power supply to control the control power supply to output the control power when an adapter detection signal having a logic value corresponding to when the adapter outputs power is detected from the adapter detection unit. An electronic device, characterized by maintaining the output of a signal. The method of claim 14, The micro control unit receives the adapter detection signal from the adapter detection unit and supplies the control power when an adapter detection signal having a logic value corresponding to the case where the adapter outputs power from the adapter detection unit is detected. And an additional outputting latch signal to the control power on / off circuit unit to block the output of the control power. The method of claim 15, The micro control unit is configured to determine the logic value of the system power selection signal output from the power selection unit in a state in which an adapter detection signal having a logic value corresponding to when the adapter outputs power from the adapter detection unit is detected. And controlling the output of the system driving power to the system power supply in response to the change being detected.