TWI495993B - A docking station and controlling method - Google Patents

Description

Expansion base and control method

The present invention relates to a docking station, and more particularly to an docking station for a tablet computer.

With the advancement of technology, the tablet computer has gradually replaced the general notebook computer because of its simple operation and convenient carrying, and has become an electronic product that the user carries with him. For the convenience of users, some tablets have a docking station for providing USB ports, an external power supply input, or a CD player interface for tablet access.

However, the USB ports on the docking station are currently powered by the tablet. Therefore, the tablet must be powered to the USB port on the docking station after the battery on the tablet has a certain amount of power, so that the tablet can be expanded. The USB port on the base communicates with the external electronics connected to the USB port.

Since the USB port on the docking station is currently powered by the tablet battery, it is not convenient for the user. Therefore, there is a need to improve the current power supply method for the USB port on the docking station.

The invention provides an expansion base comprising a first battery, a power supply input end, a USB port, a switch unit and a control unit. A power supply input for receiving a power input voltage of a power supply. The switch unit is configured to selectively supply power to the USB port according to a control signal. control The unit is configured to provide a control signal to the switch unit according to the power input voltage, the power of the first battery and the tablet when the docking station is combined with a tablet computer, wherein the power input voltage is greater than or equal to a first preset voltage When the power input voltage is less than the first preset voltage but the power of the first battery is greater than or equal to a first preset power, the switch unit causes the USB port to be powered by the power input voltage and/or the first battery according to the control signal. .

The invention provides a control method for an expansion base, which is suitable for There is a first battery, a power supply input terminal, a switch unit and a control unit one of the expansion bases. The control method includes: when the expansion base is combined with a tablet computer, detecting the power of the first battery, a power input voltage of the power supply input end, and the power of the tablet; according to the first battery power, the power input voltage, and the tablet And outputting a control signal to the switch unit; and when a first condition is satisfied, controlling the switch unit according to the control signal, so that the USB port is powered by the power input voltage and/or the first battery, wherein the first condition is a power source The input voltage is greater than or equal to a first predetermined voltage, or the power input voltage is less than the first preset voltage, but the power of the first battery is greater than or equal to a first preset power.

5‧‧‧Electronic system

10‧‧‧Expansion base

11‧‧‧First battery

12‧‧‧Power supply input

13‧‧‧Switch unit

14‧‧‧Control unit

15‧‧‧USB埠

16‧‧‧First connection埠

30‧‧‧ tablet

31‧‧‧Second battery

32‧‧‧Display unit

33‧‧‧Input unit

34‧‧‧Processing unit

35‧‧‧Second connection

C1‧‧‧ control signal

S21-S22, S31-S34, S41-S44, S51-S55‧‧‧ steps

1 is a schematic diagram of an electronic system according to the present invention; FIG. 2 is a control flow chart of an electronic system according to the present invention; and FIGS. 3A to 3C are schematic views showing an operation mode of an electronic system provided by the present invention; Figure 4 is a control flow chart of the first switch provided by the present invention; Figure 5 is a control flow chart of the second switch provided by the present invention; and Figure 6 is a control flow chart of the third switch provided by the present invention.

The apparatus and method of use of various embodiments of the present invention are discussed in detail below. However, it is to be noted that many of the possible inventive concepts provided by the present invention can be implemented in various specific ranges. These specific examples are only intended to illustrate the apparatus and methods of use of the present invention, but are not intended to limit the scope of the invention.

Figure 1 is a schematic illustration of an electronic system provided by the present invention. As shown in FIG. 1, the electronic system 5 includes a docking station 10 and a tablet computer 30. The docking station 10 includes a first battery 11, a power supply input terminal 12, a switch unit 13, a control unit 14, a USB port 15, and a first port 16. In this embodiment, the tablet 30 can also be a portable electronic device. In other embodiments, the portable electronic device can also be a smart phone, a handheld mobile device, a notebook computer, or a personal digital assistant (PDA), but not limited thereto.

The tablet 30 includes a second battery 31, a display unit 32, an input unit 33, a processing unit 34, and a second port 35. In one embodiment, the second battery 31 is used to provide power to the tablet 30 and/or the USB port 15. In one embodiment, the docking station 5 of the electronic system 5 and the tablet computer 30 are electrically connected to each other by a first connecting port 16 and a second connecting port 35, respectively. For example, when the docking station 10 and the tablet computer 30 are electrically connected to each other by the first connecting port 16 and the second connecting port 35, the docking station 10 and the tablet computer 30 can communicate with each other, for example, to transmit data, signals or power. The first and second ports 16 and 35 may be USB interfaces, thunderbolt interfaces, lightning bolt interfaces or RS232 interfaces, but are not limited thereto. In another embodiment, the docking station 10 is further Including CD player, hard disk, keyboard or touch pad, but not limited to this.

In this embodiment, the second battery 31 of the tablet computer 30 is used to raise Power is supplied to the tablet 30 and/or USB port 15. The second battery 31 has a gauge IC for measuring the amount of electricity of the second battery 31. In one embodiment, the metering integrated circuit of the second battery 31 is used to calculate the amount of discharge and the amount of charge of the battery, and the remaining amount of power of the second battery 31 is known.

Display unit 32, input unit 33, processing list of tablet 30 The element 34 is similar to the characteristics and operation of the related unit in the general tablet computer, and the related description can refer to the general tablet computer, and details are not described herein again.

In this embodiment, the first battery 11 is used to provide power to the expansion. Base 10 and/or tablet 30. The first battery 11 has a gauge IC for measuring the amount of electricity of the first battery 11. The power supply input 12 is for receiving power from a power supply. In one embodiment, the power received by the power supply input 12 is used to supply the docking station 10 and/or the tablet 30.

In an embodiment, when the power supply of the power supply is supplied to the power supply At the supply input 12, the power supply input 12 has a power supply input voltage. For example, when a power supply with a rated power of 18 watts and an output voltage of 12V is connected to the power supply input terminal 12, the power supply input voltage is 12 volts. When a power supply with a rated power of 10 watts and an output voltage of 5V is connected to the power supply input terminal 12, the power supply input voltage is 5 volts. When the power supply is not connected to any power supply or the power supply is off, the power input voltage is 0 volts.

The switching unit 13 is configured to be based on a control signal from the control unit 14 C1 is selectively powered to the USB port 15 so that the tablet 30 communicates with the electronic device to which the USB port 15 is connected. For example, the switch unit 13 can be selectively powered by the docking station 10 to the USB port 15 according to the control signal C1, or can be powered by the tablet computer 30 to the USB port 15. In an embodiment, the switch unit 13 has a first switch 21, a second switch 22, and a third switch 23. For example, the first, second, and third switches 21-23 may be field effect transistors (FETs), bipolar junction transistors (BJTs), metal oxide field effect semiconductors (MOSFETs), or complementary Metal oxide field effect semiconductor (CMOS), but not limited to this.

In this embodiment, the first switch 21 is coupled to the first battery 11 and / Or between the power supply input 12 and the USB port 15. The second switch 22 is coupled between the first battery 11 and/or the power supply input end 12 and the first connection port 16 . In one embodiment, when the docking station 10 and the tablet 30 are combined, the second switch 22 can be coupled to the lithographic computer 30 through the first port 16 . The third switch 23 is coupled between the first port 16 and the USB port 15. In one embodiment, when the docking station 10 and the tablet 30 are combined, the third switch 23 can be coupled to the lithographic computer 30 through the first port 16 .

The control unit 14 can be a general purpose processor, an application processor, Keyboard controller (KBC), embedded controller or microcontroller, but not limited to this. The control unit 14 is connected to the switch unit 13 and the first battery 11 via a bus bar. The control unit 14 can obtain the current amount of power of the first battery 11 via a gauge IC in the first battery 11. When the docking station 10 is combined with the tablet computer 30, the control unit 14 can also know the current power of the second battery 31 (or the power of the tablet computer 30) via the metering integrated circuit of the second battery 31. In one implementation In the example, the control unit 14 is configured to provide the control signal C1 to the switch unit 13 according to the power input voltage, the power of the first battery 11 and the tablet 30 when the docking station 10 is combined with the tablet computer 30.

For example, when the power supply has enough output voltage (example If the power supply is rated at 18 watts and the output voltage is 12 volts, the power supply input voltage received by the power supply input 12 may be greater than or equal to a first predetermined voltage (eg, 12 volts). When the control unit 14 detects that the power input voltage is greater than or equal to the first preset voltage, the control unit 14 sends the control signal C1 to the switch unit 13 so that the first switch 21 is turned on, and the USB port 15 is replaced by the first battery 11 and/or The power supply input 12 is powered. In detail, in the embodiment, as long as the output voltage of the power supply is sufficient (for example, the power input voltage of the power supply input terminal 12 is greater than or equal to 12 volts), regardless of the amount of power of the first battery 11 and the tablet 30 The first switch 21 will be turned on.

In another embodiment, when the voltage output by the power supply is less than the first predetermined voltage (for example, the power supply is rated at 10 watts and the output voltage is 5 volts), but the power of the first battery 11 is greater than or equal to When the first preset power is discharged, the control unit 14 sends the control signal C1 to the switch unit 13 so that the first switch 21 is turned on. When the first switch 21 is turned on, the USB port 15 is powered by the power input voltage and/or the first battery 11. In detail, in this embodiment, when the voltage output by the power supply is less than 12 volts, but the power of the first battery 11 is greater than the first predetermined power, the first switch 21 will be regardless of the power of the tablet 30. Will be turned on. In this embodiment, the first preset power amount is 30% of the power amount when the first battery 11 is fully charged. However, the first predetermined amount of power may also be other ratios of the amount of electricity when fully charged. For example, the first preset power can be 40% or 50% of the full charge, and Not limited to this.

In another embodiment, when the power supply input terminal 12 is connected to the power When the source supply is powered, the control unit 14 sends a control signal C1 to the switch unit 13 such that the second switch 22 is turned on, and the first battery 11 and/or the power input voltage charges the tablet 30. In detail, in the embodiment, as long as the power supply input terminal 12 is connected to the power supply to provide power, regardless of whether the voltage output by the power supply is sufficient, and whether the first battery 11 and the tablet 30 are powered Sufficiently, the second switch 22 will be turned on. In this embodiment, the second preset voltage is 5V, but is not limited thereto. For example, the second preset voltage may be 3V, 4V or 6V, but not limited thereto.

In another embodiment, when the power supply input 12 is not connected The power supply (ie, the power input voltage is zero), but when the power of the first battery 11 is greater than or equal to the first preset power (for example, 30% of the full charge), the control unit 14 sends the control signal C1 to the switch unit 13, so that The second switch 22 is turned on, and the first battery 11 charges the tablet computer 30. In detail, in the embodiment, when the power input voltage is zero, as long as the power of the first battery 11 is greater than or equal to the first preset power, the control unit 14 determines whether the power of the tablet 30 is sufficient, and the second switch 22 Will be turned on.

In another embodiment, when the voltage output by the power supply is small When the first preset voltage is lower than the first preset power, and the power of the tablet 30 is greater than or equal to a second preset power (for example, 30% of the charged power of the second battery 31) The control unit 14 sends the control signal C1 to the switch unit 13 so that the third switch 23 is turned on. When the third switch 23 is turned on, the USB port 15 is powered by the tablet computer 30.

Figure 2 is a control flow chart of the docking station provided by the present invention Figure. As shown in FIG. 2, at step S21, the control unit 14 detects the amount of power of the first battery 11, the power input voltage, and the power 31 of the tablet computer 30. In one embodiment, the control unit 14 reads the current state of the first battery 11 and the tablet computer 30 by reading the values of the gauge ICs in the first battery 11 and the second battery 31, respectively. At the same time, the control unit 14 can obtain the value of the power input voltage by detecting the voltage of the power supply input terminal 12.

At step S22, the control unit 14 is based on the power of the first battery 11. The amount, the power input voltage, and the power of the tablet 30 provide a control signal C1 to the switch unit 13 for selective power supply to the USB port 15. In the present embodiment, the switch unit 13 has first, second, and third switches 21-23. When the switch unit 13 receives the control signal C1, the switch unit 13 determines the switch to be turned on according to the control signal C1. For example, the control signal C1 may be a three-bit (3-bits) control signal, and different bits respectively represent control signals of different switches. When the first bit is at a high level, the first switch 21 is turned on. Conversely, when the first bit is at a low level, the first switch 21 is turned off. The control signal C1 may be a control signal of other bit numbers or a control signal with coding, but is not limited thereto.

In an embodiment, when the control unit 14 detects the power input The voltage is greater than or equal to a first predetermined voltage (eg, 12 volts), or the power input voltage is less than the first predetermined voltage, but the power of the first battery 11 is greater than or equal to a first predetermined power (eg, 30 of the charged power) At the time of %), the control unit 14 issues a control signal C1 to the switching unit 13 such that the first switch 21 is turned on and will be powered by the first battery 11 and/or the power supply input voltage to the USB port 15. In this embodiment, when the power input voltage is greater than or equal to a first preset voltage (eg, 12 volts), or the power is lost. When the input voltage is less than the first preset voltage but the power of the first battery 11 is greater than or equal to a first predetermined power amount (for example, 30% of the charged power), it is considered to satisfy a first condition.

In another embodiment, the control unit 14 can also be powered according to the power supply. The output wattage of the device determines whether the first condition is met. For example, when the output wattage of the power supply is greater than or equal to a first predetermined wattage (eg, 18 watts), or the output wattage of the power supply is less than the first predetermined wattage, but the first battery 11 When the amount of power is greater than or equal to a first predetermined amount of power (for example, 30% of the charged amount), the first condition is considered to be satisfied.

In another embodiment, the control unit 14 can also be based on the power input. The voltage and a supply current flowing through the input terminal 12 of the power supply supply determine whether the first condition is met. For example, when the power input voltage is greater than or equal to a first predetermined voltage (eg, 12 volts) and the supply current is greater than or equal to a first predetermined current (eg, 1.5 amps), or when the power supply output voltage is less than The first preset voltage and/or the supply current is less than a first preset current, but the first battery 11 is greater than or equal to a first preset power (eg, 30% of the charged power) A condition.

In another embodiment, when the control unit 14 detects the power input The voltage is greater than or equal to a second predetermined voltage (for example, 5V), or when the power input voltage is less than the second preset voltage, but the power of the first battery 11 is greater than or equal to a first preset power (for example, 30 of the charged power) At the time of %), the control unit 14 issues a control signal C1 to the switching unit 13 such that the second switch 22 is turned on and will be powered by the first battery 11 and/or the power input voltage to the tablet 30.

In another embodiment, when the control unit 14 detects the power input The voltage is less than a first preset voltage (for example, 12V), the power of the first battery 11 is less than the first preset power (for example, 30% of the charged power), and the power of the tablet 30 is greater than the second preset power (for example, the tablet) When 30% of the charge of 30 is charged, the control unit 14 sends a control signal C1 to the switch unit 13, so that the third switch 23 is turned on, and the tablet 30 is powered to the USB port 15.

3A to 3C are diagrams showing the operation of the electronic system provided by the present invention A schematic representation of the style. 3A to 3C are diagrams showing the power supply specifications of the first, second, and third switches 21 to 23 in the switch unit 13 according to the power supply input terminal 12, the power of the first battery 11, and the tablet. The amount of power of the battery 31 (for example, the amount of power of the second battery 31) determines whether it is turned "ON" or "OFF". In FIGS. 3A to 3C, different combinations of the power supply specifications to which the power supply input terminal 12 is connected, the amount of power of the first battery 11 and the amount of power of the flat battery 31 are divided into different styles (for example, style 1 - Style 48).

Power supply (rated voltage / rated) in Figures 3A to 3C Current) is used to indicate the power supply specification that is connected to the power supply input terminal 12. For example, a power supply with a specification of 12V/1.5A indicates that the power supply has a rated output voltage of 12V (volts) and a maximum output current of 1.5A (amperes). Although the power supply in Figures 3A to 3C has only two power supplies of 12V/1.5A and 5V/A, other power supplies are not limited thereto.

The electric power of the first battery 11 of the docking station 10 in FIGS. 3A to 3C The amount is used to indicate the amount of electricity of the first battery 11. In an embodiment, the control unit 14 can know the amount of power of the first battery 11 and whether it is full or not via the metering integrated circuit in the first battery 11. In this embodiment, the power of the first battery 11 is full, Normal, low, and extremely low are used to indicate the relationship between the amount of electricity of the first battery 11 and the amount of charge of the first battery 11 respectively. For example, "full" means that the first battery 11 is fully charged (100% when full), and "normal" means that the first battery 11 is between 100% and 30% of the full charge," The low "system" indicates that the electric quantity of the first battery 11 is between 30% and 10% when full, and the "very low" means that the electric quantity of the first battery 11 is between 10% and 0% when full. It should be noted that the above-mentioned full, normal, low, and extremely low values may also be other ratios of full charge, and are not limited thereto.

Similarly, the power of the second battery 31 in the tablet 30 is also Fully, normal, low, and very low means that it also represents the proportional relationship between the current state of the second battery 31 and the second battery 31. For the related description, please refer to the first battery 11, and the details are not described herein. It should be noted that in the present invention, the amount of power of the second battery 31 can also be expressed by the amount of power of the tablet 30.

Figure 4 is a control flow of the first switch provided by the present invention Figure. As shown in FIG. 4, at step S31, the control unit 14 determines whether the power supply input voltage of the power supply input terminal 12 is greater than or equal to a first predetermined voltage (for example, 12V). When the power supply input voltage is greater than or equal to the first predetermined voltage, the process proceeds to step S32 (such as patterns 1-4, 13-16, 25-28, 37-40 of FIGS. 3A-3C). On the other hand, when the power input voltage is less than the first predetermined voltage, the process proceeds to step S33.

In one embodiment, the power supply input 12 has a power supply input voltage when the power supply input 12 is connected to the power supply. For example, when the power supply connected to the power supply input terminal 12 is a 12V power supply, the power input voltage is 12V. Conversely, when the power supply input terminal 12 is not connected to the power supply, the power supply input voltage is 0V. In this implementation In the example, the first preset voltage is 12V, but not limited thereto.

At step S32, the control unit 14 issues a control signal C1 such that the first switch 21 is turned on and the USB port 15 is powered by the first battery 11 and/or the power input voltage.

At step S33, the control unit 14 determines whether the amount of power of the first battery 11 is less than the first predetermined amount of power. When the electric quantity of the first battery 11 is greater than or equal to the first preset electric quantity (30% of the full electric quantity), the process proceeds to step S32 (as in the patterns 5-6, 9-10, 17-18 of FIGS. 3A to 3C). , 21-22, 29-30, 33-34, 41-42, 45-46). On the other hand, when the power input voltage is less than the first predetermined power amount, the process proceeds to step S34. In the present embodiment, the control unit 14 can know the current amount of the first battery 11 via the metering integrated circuit of the first battery 11. In this embodiment, the first preset power is 30% of the power when the first battery 11 is full, but is not limited thereto. At step S34, the control unit 14 issues the control signal C1 such that the first switch 21 is turned off (as in the patterns 7-8, 11-12, 19-20, 23-24, 31-32 of FIGS. 3A-3C, 35-36, 43-44, 47-48).

Figure 5 is a control flow chart of the second switch provided by the present invention. As shown in FIG. 5, at step S41, the control unit 14 determines whether the power supply input voltage of the power supply input terminal 12 is greater than or equal to a second predetermined voltage (for example, 5V). When the power supply input voltage is greater than or equal to the second predetermined voltage, the process proceeds to step S42 (as in the patterns 1-8, 13-20, 25-32, 37-44 of FIGS. 3A to 3C). On the other hand, when the power input voltage is less than the second predetermined voltage, the process proceeds to step S43. In this embodiment, the second preset voltage is 5V, but is not limited thereto. At step S42, the control unit 14 issues a control signal C1 such that the second switch 22 is turned on, and the first battery 11 and/or the power input voltage charges the tablet 30.

At step S43, the control unit 14 determines the amount of power of the first battery 11. Whether it is less than the first preset power. When the electric quantity of the first battery is greater than or equal to the first preset electric quantity (30% of the full electric quantity), the process proceeds to step S42 (as in the patterns 9-10, 21-22, 33-34 of FIGS. 3A to 3C, 45-46). On the other hand, when the power input voltage is less than the first predetermined power amount, the process proceeds to step S44. At step S44, the control unit 14 issues a control signal C1 such that the second switch 21 is turned off (as in the patterns 11-12, 23-24, 35-36, 47-48 of FIGS. 3A-3C).

Figure 6 is a control flow chart of the third switch provided by the present invention. As shown in FIG. 6, at step S51, the control unit 14 determines whether the power supply input voltage of the power supply input terminal 12 is greater than or equal to a first predetermined voltage (for example, 12V). When the power supply input voltage is greater than or equal to the first predetermined voltage, the process proceeds to step S52 (as in the patterns 1-4, 13-16, 25-28, 37-40 of FIGS. 3A to 3C). On the other hand, when the power supply input voltage is less than the first predetermined voltage, the process proceeds to step S53. In this embodiment, the first preset voltage is 12V, but is not limited thereto. At step S52, the control unit 14 issues a control signal C1 such that the third switch 23 is turned off and the tablet 30 does not supply power to the USB port 15.

At step S53, the control unit 14 determines whether the amount of power of the first battery 11 is less than the first predetermined amount of power. When the electric quantity of the first battery 11 is greater than or equal to the first preset electric quantity (30% of the full electric quantity), the process proceeds to step S52 (as in the patterns 5-6, 9-10, 17-18 of FIGS. 3A to 3C). , 21-22, 29-30, 33-34, 41-42, 45-46). On the other hand, when the power input voltage is less than the first predetermined power amount, the process proceeds to step S54. In this embodiment, the first preset power is 30% of the power when the first battery 11 is full, but is not limited thereto.

At step S54, the control unit 14 determines the amount of power of the tablet 30. Whether it is less than a second preset power (30% of the full charge of the tablet 30). When the power of the tablet computer 30 is greater than or equal to the second preset power amount, the process proceeds to step S55 (as in the patterns 7-8, 11-12, 19-20, 23-24 of FIGS. 3A to 3C). On the other hand, when the amount of power of the tablet computer 30 is less than the second predetermined amount of power, the process proceeds to step S52 (as in the patterns 31-32, 35-36, 43-44, and 47-48 of FIGS. 3A to 3C).

In this embodiment, the control unit 14 can be via the second battery 31. The integrated circuit is measured to know the current amount of power of the tablet 30 (second battery 31). In this embodiment, the second preset power is 30% of the power when the second battery 31 is full, but is not limited thereto.

Expansion base and control method provided by the invention, control The unit 14 can control the switch unit 13 in accordance with the power source input voltage, the amount of power of the first battery 11, and the amount of power of the second battery 31 to selectively supply power to the USB port 15. It should be noted that the switch unit 13 in the present invention can also be used as a power switch for other devices (such as a CD player or a hard disk).

In summary, the expansion base and the control side provided by the present invention The method can enable the control unit 14 to select the power supply mode of the USB port 15 according to the power input voltage, the power of the first battery 11, and the power of the second battery 31, so as to facilitate the user.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

5‧‧‧Electronic system

10‧‧‧Expansion base

11‧‧‧First battery

12‧‧‧Power supply input

13‧‧‧Switch unit

14‧‧‧Control unit

15‧‧‧USB埠

16‧‧‧First connection埠

30‧‧‧ tablet

31‧‧‧Second battery

32‧‧‧Display unit

33‧‧‧Input unit

34‧‧‧Processing unit

35‧‧‧Second connection

C1‧‧‧ control signal

Claims (8)

An expansion base includes: a first battery; a power supply input end for receiving a power input voltage of a power supply; a USB port; and a switch unit for selectively supplying power according to a control signal To the USB port, so that a tablet computer communicates with the electronic device connected to the USB port; and a control unit for combining the power source input voltage with the first battery when the expansion base is combined with the tablet computer The power of the tablet computer provides the control signal to the switch unit, wherein when the first condition is satisfied, the switch unit causes the USB port to be powered by the power input voltage and/or the first battery according to the control signal And the first condition is that the power input voltage is greater than or equal to a first preset voltage, or the power input voltage is less than the first preset voltage, but the power of the first battery is greater than or equal to a first preset power . The expansion base according to claim 1, wherein when the first condition is not satisfied, but the power of the tablet is greater than or equal to a second preset power, the switch unit causes the foregoing according to the control signal. The USB port is powered by the above tablet. The expansion unit of claim 1, wherein the switch unit further comprises: a first switch coupled to the first battery and/or the power supply The second switch is coupled between the first battery and/or the power supply input end and the tablet computer; and a third switch coupled to the tablet computer and the second switch Between the USB ports, wherein the first switch is turned on according to the control signal, so that the USB port is powered by the power input voltage and/or the first battery. The expansion base of claim 3, wherein when a second condition is satisfied, the second switch is turned on, so that the first battery and/or the power input voltage is charged to the tablet computer, wherein the The second condition is that the power input voltage is greater than or equal to a second preset voltage, or the power input voltage is less than the second preset voltage, but the power of the first battery is greater than the first preset power, wherein the second preset The voltage is set to be smaller than the first predetermined voltage and greater than zero. The expansion base of claim 3, wherein when the first condition is not satisfied, but the power of the flat battery is greater than or equal to the second predetermined power, the third switch is turned on, so that the USB port is Powered by the tablet. The method for controlling the expansion base is applicable to a first battery, a power supply input end, a switch unit, and a expansion base. The control method includes: when the expansion base is combined with a tablet computer, Detecting a quantity of the first battery, a power input voltage of the input end of the power supply, and a power of the tablet; And outputting a control signal to the switch unit according to the power of the first battery, the power input voltage, and the power of the tablet computer; and when a first condition is satisfied, controlling the switch unit according to the control signal, so that the USB port is And the power supply input voltage and/or the first battery is powered by, wherein the first condition is that the power input voltage is greater than or equal to a first preset voltage, or the power input voltage is less than the first preset voltage, but the foregoing The first battery has a power greater than or equal to a first predetermined power. The method for controlling the docking station according to claim 6, further comprising: when the first condition is not satisfied, but the power of the tablet computer is greater than or equal to a second preset power, the switch is controlled according to the control signal. The unit is such that the USB port is powered by the tablet. The control method of the docking station according to claim 6, further comprising: when a second condition is satisfied, controlling the switch unit according to the control signal, so that the first battery and/or the power source input voltage are opposite to the tablet The computer performs charging, wherein the second condition is that the power input voltage is greater than or equal to a second preset voltage, or the power input voltage is less than the second preset voltage, but the power of the first battery is greater than the first preset The electric quantity, wherein the second preset voltage is smaller than the first preset voltage and greater than zero.