TWI529521B - Method for managing power and portable electronic device using the same - Google Patents

Description

Power management method and portable electronic device using same

The present invention relates to a power management technology, and in particular to a power management method and a portable electronic device using the same.

With the development of technology, the application of portable electronic devices is becoming more and more popular. In order to meet the portability of portable electronic devices, the importance of batteries is self-evident. However, the capacity of the battery is usually very limited. To ensure that the portable electronic device can be used continuously, it is convenient to replace the battery while ensuring that the system is operating normally.

Although a button cell is usually built in the current portable electronic device, the button cell is essentially an RTC battery, that is, it only supplies power to the internal real-time clock and calendar, and cannot supply power to other operating modules. Therefore, if the battery is directly replaced when the portable electronic device is not connected to the external power adapter, the entire portable electronic device cannot be operated. All operations performed by the user before the battery is replaced, including surfing the Internet, transferring data, etc., are interrupted, which is extremely inconvenient.

It is an object of the present invention to provide a power management method and a portable electronic device using the same to improve the lack of the prior art.

According to an aspect of the present invention, a power management method provided by the present invention is implemented in a portable electronic device. The portable electronic device includes a first battery, a second battery, a central processing unit, and an operation module. The power management method includes the following steps. Detecting system power consumption of portable electronic devices. The usable time of the second battery is calculated based on the system power consumption. Compare the usable time of the second battery with the preset time. When the first battery is replaced, the power provided by the second battery is used to maintain the operating state of the operating module. When the first battery is replaced and the usable time of the second battery is less than the preset time, the operating frequency of the central processing unit is lowered.

According to another aspect of the present invention, a portable electronic device provided by the present invention includes a central processing unit, an operation module, a first battery, a second battery, and a controller. The controller is coupled to the central processor, the first battery, and the second battery. When the first battery is replaced, the power provided by the second battery maintains the operating state of the operating module. The controller detects the system power consumption and calculates the usable time of the second battery based on the system power consumption. The controller compares the usable time and the preset time of the second battery. When the first battery is replaced and the usable time of the second battery is less than the preset time, the controller lowers the operating frequency of the central processor.

The power management method provided by the present invention and the portable electronic device using the same can real-timely detect the system power consumption of the portable electronic device, and calculate the usable time of the second battery according to the Preset time for comparison. When the first battery is replaced and the usable time of the second battery is less than the preset time, the controller ensures that the power provided by the second battery can maintain the portable electronic device in the S0 state by reducing the operating frequency of the central processor. Thereby, when the first battery is replaced, the user does not need to interrupt all the operations currently performed, even if the operation module is maintained in the original working state.

The above and other objects, features, and advantages of the present invention will become more apparent and understood by the appended claims appended claims

1 is a functional block diagram of a portable electronic device in accordance with a preferred embodiment of the present invention. Please refer to Figure 1. In this embodiment, the portable electronic device 1 can be a notebook computer. However, the present invention is not limited thereto.

In this embodiment, the portable electronic device 1 has a system power terminal SP. Moreover, the portable electronic device 1 includes a first battery 10, a second battery 11, a controller 12, a sensing resistor 13, a chip set 14, a central processing unit 15, an operation module 16, a display 17, a peripheral device 18, and a power switch. The unit 19, the first battery charge controller 101, and the second battery charge controller 111.

In the embodiment, the sensing resistor 13 is disposed at the system power terminal SP and coupled to the controller 12 . The operating module 16 and the controller 12 are coupled to the central processor 15 by the chip set 14. Moreover, the controller 12 is also coupled to the display 17 and the peripheral device 18. The power switching unit 19 is coupled to the first battery 10, the second battery 11, and the controller 12. The second battery charging controller 111 is coupled to the first battery 10, the second battery 11, and the controller 12. The first battery charging controller 101 is coupled to an external power adapter, the controller 12 and the first battery 10. However, the present invention is not limited thereto.

In the embodiment, the first battery 10 is a main battery of the portable electronic device 1 to provide power required for the portable electronic device 1 to operate. The first battery 10 can be a rechargeable battery, such as a rechargeable lithium battery. However, the present invention is not limited thereto. In other embodiments, it may be a nickel-cadmium rechargeable battery or a nickel-hydrogen rechargeable battery, or may be a disposable battery.

In the present embodiment, the first battery charging controller 101 outputs the DC voltage supplied from the external power adapter to the first battery 10, and charges the first battery 10 under the control of the controller 12. Taking the first battery 10 as a rechargeable lithium battery as an example, the charging process can be divided into two stages, a constant current fast charging phase and a constant voltage current decreasing phase. In the constant current fast charging phase, the voltage of the first battery 10 is gradually increased to the standard voltage, and then is switched to the constant voltage phase under the control of the first battery charging controller 101, whereby the voltage is no longer raised to ensure the first Battery 10 does not overcharge. The current is gradually reduced to 0 as the amount of electricity of the first battery 10 rises to complete the charging. However, the present invention is not limited thereto.

In addition, in the present embodiment, the first battery charging controller 101 also controls the discharging process of the first battery 10. During the discharge process, the voltage of the first battery 10 remains substantially unchanged, and only suddenly drops when the amount of electricity of the first battery 10 is small. When the first battery charge controller 101 detects this state and considers that the first battery 10 has run out of power, the first battery charge controller 101 controls the first battery 10 to stop discharging to prevent the first battery 10 from being over-discharged. However, the present invention is not limited thereto.

In this embodiment, the second battery 11 can be a small-capacity battery, which can be used to maintain the operation of the portable electronic device 1 when the first battery 10 is replaced. Therefore, the second battery 11 can have a smaller capacity than the first battery 10. In this embodiment, the second battery 11 can also be a rechargeable battery, such as a rechargeable lithium battery. However, the present invention is not limited thereto. In other embodiments, it may be a nickel-cadmium rechargeable battery or a nickel-hydrogen rechargeable battery, or may be a disposable battery.

In the embodiment, the second battery charging controller 111 can charge the second battery 11 by using the voltage provided by the first battery 10 under the control of the controller 12, and is responsible for controlling the charging and discharging process of the second battery 11 and protecting The second battery 11. The control principle of the second battery charging controller 111 is the same as that of the first battery charging controller 101, and therefore will not be described herein. In this embodiment, since the capacities of the first battery 10 and the second battery 11 are different, the charging currents of the first battery 10 and the second battery 11 are also different, so the first battery charging controller 101 and the second are respectively disposed. The battery charge controller 111 performs charge and discharge control of the first battery 10 and the second battery 11. However, the present invention is not limited thereto.

In the present embodiment, the power switching unit 19 can be a switching element that is responsible for switching between the first battery 10 and the second battery 11. Specifically, when the portable electronic device 1 is in the battery mode, that is, when there is no external power supply, the power switching unit 19 supplies the power provided by the first battery 10 to the entire system to enable the portable electronic device 1 to operate normally. In the process of replacing the first battery 10, the power switching unit 19 cuts off the connection with the first battery 10, and switches the power of the portable electronic device 1 to the second battery 11 to supply the power of the second battery 11. The operation of the portable electronic device 1 is maintained.

In this embodiment, the operation module 16 and the peripheral device 18 may be the same type of components, or may be different types of components. For example, the operation module 16 may be an electronic component or a module that the portable electronic device 1 may still be in a specific working state when the first battery 10 is replaced, for example, an Ethernet module being connected, and The peripheral device 18 may be an electronic component or module that does not work when the portable electronic device 1 is replaced with the first battery 10, for example, a wireless network module without a connection, a Bluetooth module, a CD player, or no Connected I/O connector.

In this embodiment, the sensing resistor 13 is disposed at the system power terminal SP for detecting the total system power supply current I of the portable electronic device 1. The power supply SP of this system is usually located at the forefront of the system load R _Load in the power supply path, that is, before the DC to DC voltage converter (not shown). Thereby, connecting the sense resistor 13 in series ensures that the sense resistor 13 can obtain an accurate total system power supply current I. The system load R _Load here is the equivalent resistance of all power consumption components in the portable electronic device 1, including the central processing unit 15, the operation module 16, the display 17, and the peripheral device 18.

In the present embodiment, the inductive resistor 13 can be an ultra-low resistance current sampling element having a resistance range generally between 0.002 ohms and 0.1 ohms. However, the present invention is not limited thereto.

In this embodiment, the controller 12 can be an embedded controller, but the invention is not limited thereto. In other embodiments, it can also be a super input/output chip or a microprocessor.

In this embodiment, the controller 12 is coupled to both ends of the sensing resistor 13 , and the controller 12 can calculate the voltage flowing through the sensing resistor 13 according to the voltage across the sensing resistor 13 and according to the resistance of the sensing resistor 13 . Total current supply I. Subsequently, the controller 12 can calculate the system power consumption P according to Ohm's law, that is, the system power consumption P=I ² R _Load .

In this embodiment, the controller 12 can be coupled to the second battery 11 to detect its remaining power P _S . Moreover, the controller 12 can have a built-in storage 121. The storage unit 121 can store a preset time, which represents the allowable replacement time of the first battery 10. However, the present invention is not limited thereto. In other embodiments, the controller 12 may not include a storage unit, and the preset time may be stored in other locations of the portable electronic device 1 . Alternatively, the preset time can also be set by the user through the operation interface.

In this embodiment, the controller 12 can calculate the usable time T _{L of the} second battery 11 according to the detected system power consumption P and the remaining power P _S of the second battery 11, that is, T _L =P _S / P. And, the controller 12 can compare the usable time T _{L of the} second battery 11 with a preset time.

In this embodiment, the controller 12 can also be used to detect the power mode in which the portable electronic device 1 is currently located. Specifically, the controller 12 can detect the presence of an external power adapter through a general purpose input/output pin (GPIO) coupled to the external power adapter. If it is detected that the external power adapter is present, it is determined that the portable electronic device 1 is currently in the external power mode, thereby generating an AC_IN signal. If it is detected that the external power adapter does not exist, the controller 12 detects whether the first battery 10 is present through a general-purpose input/output pin (GPIO) coupled to the first battery 10. If the first battery 10 is present, it is determined that the portable electronic device 1 is currently in the battery mode, thereby generating a BAT_IN signal. However, the present invention is not limited thereto.

In this embodiment, the controller 12 can also be used to detect the remaining power of the first battery 10. When the remaining battery capacity of the first battery 10 is lower than a set value, for example, when the first battery 10 is formed by two rechargeable lithium batteries in series, and the remaining power is lower than 3V, the controller 12 can control a light-emitting diode. A body (not shown) emits light or a buzzer (not shown) emits a prompt tone to remind the user to replace the first battery 10. When the user replaces the first battery 10, that is, when the controller 12 detects that the first battery 10 is pulled out, the controller 12 can send a BAT_SW signal to the power switching unit 19 when the portable electronic device 1 is in the battery mode. The controller 12 controls the power switching unit 19 to switch the power of the portable electronic device 1 from the first battery 10 to the second battery 11. However, the present invention is not limited thereto.

In the embodiment, when the portable electronic device 1 replaces the first battery 10 in the battery mode, the power provided by the second battery 11 can be used to maintain the operating state of the operating module 16, that is, the operating module 16 is maintained. The state before the replacement of the first battery 10, whereby the user does not need to interrupt the current operation during the replacement of the first battery 10.

In this embodiment, during the replacement of the first battery 10 in the battery mode, the controller 12 performs corresponding processing according to the latest comparison result (the available time T _{L of the} second battery 11 is compared with the preset time). control.

Specifically, when the usable time T _{L of the} second battery 11 is less than the preset time, the controller 12 reduces the operating frequency of the central processing unit 15 through the wafer set 14. The manner of reduction can be done each time in the same proportions, for example by 10% each time. However, the present invention is not limited thereto.

In this embodiment, it is assumed that the motherboard sends a frequency of 133 MHz to the central processing unit 15, the frequency of the 133 MHz is the external frequency of the central processing unit 15, and the external frequency is multiplied by the multiplication frequency (assumed to be 21) to obtain the central processing unit 15. The main frequency is 2.8GHz. The primary frequency determines the actual operating frequency of the central processing unit of the central processor 15. In the normal state, the arithmetic logic unit (ALU) in the central processing unit 15 can receive the same frequency of 2.8 GHz. When the controller 12 initiates the down-conversion mechanism, it will decide how many clock cycles to omit to reduce the operating frequency of the central processor 15.

Specifically, when a clock cycle is transmitted to the multiplier unit of the central processor 15, a portion of the clock cycle is omitted under the control of the controller 12. Thereby, the actual frequency of the signal sent to the ALU will be reduced. Since the ALU is an element that is actually responsible for the operation in the central processing unit 15, the execution speed of the central processing unit 15 can be lowered in this way to reduce its power consumption.

In this embodiment, after reducing the operating frequency of the central processing unit 15, the controller 12 continues to detect the system power consumption P and the remaining power P _S of the second battery 11 to calculate the usable time of the second battery 11, and then Compare with preset time. If the usable time of the second battery 11 is still less than the preset time, the operating frequency of the central processing unit 15 is continuously lowered. This is repeated until the usable time of the second battery 11 is greater than or equal to the preset time.

In addition, in the embodiment, during the replacement of the first battery 10, if the usable time T _{L of the} second battery 11 is less than the preset time, the controller 12 may lower the display in addition to lowering the operating frequency of the central processing unit 15 17 brightness. In this embodiment, the display 17 can be a liquid crystal display. Alternatively, controller 12 can also turn off peripheral device 18. However, the present invention is not limited thereto.

As described above, in the embodiment, the peripheral device 18 may be an electronic component or a module that the portable electronic device 1 does not work or may not work when the first battery 10 is replaced, for example, wireless without connection. Network modules, Bluetooth modules that are not connected, CD drives that are not working, or I/O connectors that are not connected (such as USB devices or PCIE devices). The controller 12 can control the peripheral device 18 to enter a power down mode, that is, power off the peripheral device 18 to save power.

FIG. 2 is a functional block diagram of a portable electronic device according to another preferred embodiment of the present invention. Please refer to Figure 2. In this embodiment, the portable electronic device 2 can also be a notebook computer. However, the present invention is not limited thereto.

In this embodiment, the portable electronic device 2 has a system power terminal SP. Moreover, the portable electronic device 2 includes a first battery 20, a second battery 21, a controller 22, a sense resistor 23, a chip set 24, a central processing unit 25, an operation module 26, a display 27, a peripheral device 28, and a power switch. The unit 29, the first battery charging controller 201, and the second battery charging controller 211, wherein the controller 22 further includes a storage unit 221.

This embodiment is similar to the previous embodiment of the working process, the only difference is that, in the present embodiment, is responsible for detecting the current power mode 2 in which the portable electronic device 21 of the second battery remaining amount and the second P _S The remaining power of a battery 20 is the power switching unit 29.

Specifically, in the present embodiment, the power source switching unit 29 includes a power source switching switch 291 and a power source controller 292. The power switch 291 is a switching element that couples the first battery 20 and the second battery 21 and is responsible for switching between the first battery 20 and the second battery 21. The power controller 292 is coupled to the first battery 20, the second battery 21, the controller 22, and the power switch 291.

In this embodiment, the controller 22 can detect the system power consumption P and correspondingly calculate the usable time T _L of the second battery 21 according to the remaining power P _S of the second battery 21 detected by the power controller 292. Thereafter, the controller 22 compares the usable time T _{L of the} second battery 21 with the allowable replacement time of the first battery 20.

In this embodiment, the manner in which the power controller 292 detects the power mode of the portable electronic device 2 is the same as that of the controller 12 in the previous embodiment, and details are not described herein. Thereby, when the power controller 292 determines that the portable electronic device 2 is currently in the external power mode, it sends an AC_IN signal to the controller 22; when the power controller 292 determines that the portable electronic device 2 is currently in the battery mode When it sends a BAT_IN signal to the controller 22. However, the present invention is not limited thereto.

In this embodiment, when the power controller 292 detects that the remaining power of the first battery 20 is lower than a set value, the power controller 292 can control a light emitting diode (not shown) to emit light or a buzzer ( A reminder sound is emitted to remind the user to replace the first battery 20. When the user starts to replace the first battery 20, that is, when the power controller 292 detects that the first battery 20 is pulled out, the power controller 292 can send a BAT_SW signal to the power switch 291 and the controller 22. Therefore, when the portable electronic device 2 is in the battery mode, the power switch 291 is responsible for switching the power of the portable electronic device 2 from the first battery 20 to the second battery 21. Moreover, in the battery mode, the controller 22 determines whether to perform the corresponding process control based on the comparison result of the usable time T _{L of the} second battery 21 and the preset time.

In the embodiment, similarly, when the first battery 20 is replaced in the battery mode, the power provided by the second battery 21 can be used to maintain the operating state of the operating module 26, that is, the operating module 26 is maintained in the replacement state. A state before the battery 20, whereby the user does not need to interrupt the current operation during the replacement of the first battery 20.

3 is a flow chart of a power management method in accordance with a preferred embodiment of the present invention. Please refer to Figure 1 and Figure 3 together.

In this embodiment, in step S30, the system power consumption of the portable electronic device 1 is detected.

Specifically, the controller 12 can calculate the total power supply current I flowing through the sensing resistor 13 by detecting the voltage across the sensing resistor 13 and then calculating the resistance of the sensing resistor 13. Subsequently, the controller 12 can calculate the system power consumption according to Ohm's law, that is, the system power consumption P=I ² R _Load .

In step S31, the usable time of the second battery 11 is calculated based on the system power consumption P. In this embodiment, the controller 12 can be used to detect the remaining power P _{S of the} second battery 11 . However, the present invention is not limited thereto. In the embodiment illustrated in Figure 2, a second battery remaining amount of P _S 21 by the power switching unit 29 of the power supply controller 292 to detect. Subsequently, the controller 12 can calculate the usable time T _{L of the} second battery 11 according to the detected system power consumption P and the remaining power P _S of the second battery 11, that is, T _L =P _S /P.

In step S32, the usable time T _{L of the} second battery 11 is compared with a preset time. Specifically, the controller 12 compares the detected available time T _L of the second battery 11 with a preset time stored in the built-in storage 121 to determine the subsequent replacement of the first battery 10 . Whether to perform corresponding processing control.

In step S33, the power mode of the portable electronic device 1 is detected. In this embodiment, the controller 12 can be used to detect the power mode of the portable electronic device 1, thereby correspondingly generating an AC_IN signal or a BAT_IN signal. The specific method has been described in FIG. 1, and therefore will not be described again here. However, the present invention is not limited thereto. In the embodiment shown in FIG. 2, the power controller 292 of the power switching unit 29 can also be used for detection.

In the embodiment, when the power mode of the portable electronic device 1 is the battery mode, the following steps are performed; when the power mode of the portable electronic device 1 is the external power mode, the real-time detection is continued. The system power consumption of the portable electronic device 1.

In addition, the present invention does not limit the execution sequence of the step S33, and can detect the power mode of the portable electronic device 1 in real time while detecting the power consumption of the portable electronic device 1.

In step S34, when the first battery 10 is replaced, the operating state of the operating module 16 is maintained by the power provided by the second battery 11. Specifically, in this embodiment, the controller 12 can be used to detect the remaining power of the first battery 10 and determine whether the remaining power of the first battery 10 is lower than a set value. However, the present invention is not limited thereto. In the embodiment shown in FIG. 2, it is detected by the power controller 292 of the power switching unit 29.

In this embodiment, when the remaining power of the first battery 10 is lower than the set value, the portable electronic device 1 can issue a prompt to prompt the user to replace the first battery 10. When the user pulls out the first battery 10 in the battery mode, the controller 12 can send the BAT_SW signal to the power switching unit 19 to control the power switching unit 19 to switch the power of the portable electronic device 1 from the first battery 10 to the first battery 10 Two batteries 11. At the same time, the power provided by the second battery 11 can be used to maintain the operating state of the operating module 16, that is, to keep the operating module 16 in an operating state prior to replacing the first battery 10. For example, when the operation module 16 includes an Ethernet module, if the user is surfing the Internet or transferring data before replacing the first battery 10, when the first battery 10 is replaced, the power provided by the second battery 11 can be Continue to maintain the connection status of the Ethernet module.

In this embodiment, if the remaining power of the first battery 10 is not lower than the set value, it means that the first battery 10 does not need to be replaced. The controller 12 continues to detect the system power consumption of the portable electronic device 1 in real time.

In addition, the present invention does not limit the execution order of detecting the remaining power of the first battery 10, and can simultaneously detect the remaining power of the first battery 10 while detecting the power consumption of the system of the portable electronic device 1. Detect in real time.

In step S35, when the first battery 10 is replaced and the usable time of the second battery 11 is less than the preset time, the operating frequency of the central processing unit 15 is lowered.

In particular, a number of general purpose input/output pins (GPIOs) on chipset 14 are coupled to controller 12, which can trigger an SCI interrupt by changing the potential of these general purpose input/output pins. Based on this SCI interrupt, the chipset 14 sends an STPCLK# signal to the central processor 15 to cause the central processor 15 to operate at a predetermined clock cycle to reduce the actual operating frequency of the central processor 15. This preset clock period can be set by the user in the BIOS. For example, if the preset clock period of the user in the BIOS is 75%, the actual operating frequency of the CPU 15 is 75% of the original, so as to realize the intermittent operation and reduce the system power consumption.

Moreover, as shown in step S35, when the first battery 10 is replaced and the usable time of the second battery 11 is less than the preset time, the brightness of the display 17 can also be lowered. Specifically, in this embodiment, the controller 12 can transmit a negative pulse having a certain pulse duty ratio to emit a corresponding pulse signal to a light source (not shown) in the display 17 to control the light source in one cycle of the pulse signal. Part of the time is in the "lighted" state, and the rest of the time is in the "off" state. Since the human eye cannot distinguish frequencies exceeding 25 Hz, as long as this period is less than 0.04 s, the visual persistence of the human eye can be utilized to make the illuminance of the light source appear continuous. Moreover, by controlling different pulse duty ratios, the human eye can feel different luminances of illumination. For example, when the pulse duty ratio is 0.8, the human eye will feel that the light-emitting luminance of the light source is larger than the luminance of the light when the pulse duty ratio is 0.3. Thereby, the control of the brightness of the display 17 can be achieved.

Alternatively, as shown in step S37, when the first battery 10 is replaced and the usable time of the second battery 11 is less than the preset time, the peripheral device 18 is turned off.

In this embodiment, the controller 12 may repeat steps S35-S37 until the usable time T _{L of the} second battery 11 is greater than or equal to the preset time.

In step S38, after the replacement of the first battery 10 is completed, the second battery 11 is charged. Specifically, in this embodiment, after the user replaces the first battery 10, the controller 12 can control the power switching unit 19 to switch the power of the portable electronic device 1 to the newly replaced first battery 10. The second battery 11 is controlled to be charged by the power supplied from the newly replaced first battery 10.

At the same time, as shown in step S39, when the replacement of the first battery 10 is completed, the operating frequency of the central processing unit is restored. Moreover, if the controller 12 has lowered the brightness of the display 17 or has turned off the peripheral device 18 when the first battery 10 is replaced, the controller 12 can restore the brightness of the display 17 to the initial state after the first battery 10 is replaced. Brightness, and turning on the peripheral device 18, restores power to the peripheral device 18.

In summary, the power management method and the portable electronic device using the same according to the embodiments of the present invention can detect the system power consumption of the portable electronic device in real time, and calculate the usable capacity of the second battery according to the method. Time is compared to the preset time. When the first battery is replaced and the usable time of the second battery is less than the preset time, the controller maintains the portable electronic device in the S0 state by lowering the operating frequency of the central processing unit. Thereby, the user does not need to interrupt all operations currently performed when the first battery is replaced. In addition, the power management method and the portable electronic device using the same according to the embodiments of the present invention detect the power consumption of the system before the first battery is replaced, thereby avoiding the load of the power consumption of the computing system. If it is too large, it may cause a power failure due to insufficient power of the second battery during the replacement of the first battery.

Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make some modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention is subject to the definition of the scope of the patent application.

1, 2. . . Portable electronic device

10, 20. . . First battery

101, 201. . . First battery charge controller

11, 21. . . Second battery

111, 211. . . Second battery charge controller

12, 22. . . Controller

121, 221. . . Storage

13,23. . . Inductive resistance

14, 24. . . Chipset

15,25. . . CPU

16, 26. . . Operation module

17, 27. . . monitor

18, 29. . . Peripheral device

19, 29. . . Power switching unit

291. . . Power switch

292. . . Power controller

AC_IN, BAT_IN, BAT_SW. . . Signal

I. . . System power supply total current

R _Load . . . System load

S30～S39. . . step

SP. . . System power terminal

1 is a functional block diagram of a portable electronic device in accordance with a preferred embodiment of the present invention.

FIG. 2 is a functional block diagram of a portable electronic device according to another preferred embodiment of the present invention.

3 is a flow chart of a power management method in accordance with a preferred embodiment of the present invention.

S30～S39. . . step

Claims (18)

A power management method is implemented in a portable electronic device. The portable electronic device includes a first battery, a second battery, a central processing unit, a sensing resistor, and an operation module. The power management method includes (a) detecting the system power consumption of one of the portable electronic devices by the sensing resistor; (b) calculating the usable time of the second battery according to the power consumption of the system; (c) comparing the second The usable time of the battery is a preset time, which is a time required for the user to replace the first battery; (d) when the first battery is replaced, the power provided by the second battery is utilized To maintain the operating state of the operating module; and (e) reducing the operating frequency of one of the central processors when the first battery is replaced and the usable time of the second battery is less than the predetermined time. The power management method of claim 1, further comprising detecting a power mode of the portable electronic device. The power management method of claim 2, wherein the step (d) and the step (e) are performed when the power mode is the battery mode and the first battery is replaced. The power management method of claim 1, wherein the operation module comprises an Ethernet module, and in the step (d), the power provided by the second battery is used to maintain the Ethernet The connection status of the network module. The power management method of claim 1, wherein the portable electronic device further comprises a display, the power management method further comprising: when the first battery is replaced and the second battery is usable for less than Decrease the brightness of the display at preset times. The power management method of claim 1, wherein the portable electronic device further comprises a peripheral device, the power management method further comprising: when the first battery is replaced and the second battery is usable for less than At the preset time, the peripheral device is turned off. The power management method of claim 1, further comprising: charging the second battery after the first battery replacement is completed. The power management method of claim 1, further comprising: replying to the operating frequency of the central processor after the first battery replacement is completed. A portable electronic device includes: a central processing unit; an operation module; a first battery; and a second battery, wherein when the first battery is replaced, the power provided by the second battery maintains the operation module a controller, coupled to the central processing unit, the first battery, and the second battery, the controller detects a system power consumption, and calculates the second battery according to the system power consumption Use time, the controller Comparing the usable time of the second battery with a preset time, which is a time required for the user to replace the first battery; and a sensing resistor; wherein when the first battery is replaced and the second When the usable time of the battery is less than the preset time, the controller reduces the operating frequency of the central processing unit. The portable electronic device has a system power terminal, and the sensing resistor is disposed at the power supply end of the system and coupled to the The controller detects the power consumption of the system by the sensing resistor. The portable electronic device of claim 9, further comprising a display coupled to the controller, when the first battery is replaced and the second battery is usable for less than a preset time, The controller reduces the brightness of the display. The portable electronic device of claim 9, further comprising a peripheral device coupled to the controller, when the first battery is replaced and the second battery is usable for less than the preset time The controller turns off the peripheral device. The portable electronic device of claim 9, further comprising a power switching unit coupled to the first battery, the second battery, and the controller. The portable electronic device of claim 12, wherein the power switching unit detects a power mode of the portable electronic device. The portable electronic device according to claim 9 of the patent application, which also includes A second battery charging controller is coupled to the controller and the second battery. After the first battery replacement is completed, the controller controls the second battery charging controller to charge the second battery. The portable electronic device of claim 9, wherein the controller detects a power mode of the portable electronic device. The portable electronic device of claim 9, wherein the operation module comprises an Ethernet module, and when the first battery is replaced, the power provided by the second battery maintains the Ethernet The connection status of the network module. The portable electronic device of claim 9, wherein the controller is an embedded controller. The portable electronic device of claim 9, wherein the preset time is stored in the controller.