TWI499903B - Electronic apparatus and power controlling method - Google Patents

Description

Electronic device and power control method

The present invention relates to a power control technique, and more particularly to an electronic device having a graphics processing unit and a power control method thereof.

The Central Processing Unit (CPU) is the primary tool used by electronic devices with computer systems to execute and manipulate algorithms. In addition to the central processing unit, in order to cope with the increasing image processing requirements, the display cards disposed on the motherboard are mostly equipped with independent graphics processing units (GPUs) and display memory to speed up the image information. Processing speed.

The architecture of a general graphics processing unit can be divided into a discrete graphics processing unit (Discrete GPU) and a unified memory architecture (UMA) GPU. For the discrete graphics processing unit, the output interface of the image information is, for example, display port (DP), video graphics array (VGA), and low-voltage differential signaling (LVDS). The interface, the High Definition Multimedia Interface (HDMI) or the Digital Visual Interface (DVI) are all placed on the same chip together with the graphics processing unit.

However, as the graphics function of the graphics processing unit is enhanced, the power requirements of the graphics processing unit and the output interface described above will also increase significantly. In addition, in order to obtain the power required for operation, some high-order maps The processing unit increases the number of connectors connected to the transmission power source to obtain a larger amount of power. Therefore, conventional graphics processing units often consume a lot of power, and due to the increase in the number of connectors of the graphics processing unit, manufacturers also spend a higher cost in manufacturing the graphics processing unit.

The invention provides an electronic device and a power control method, which can reduce power consumption in an electronic device and achieve an energy saving effect of the electronic device.

The present invention provides an electronic device including a central processing unit (CPU) and a graphics processing unit (GPU). The graphics processing unit is coupled to the central processing unit. The graphics processing unit includes a plurality of output interfaces. When coupled to the expansion device through the output interface, power is supplied to the graphics processing unit and the output interface. When the output interface is not coupled to the expansion device, when the electronic device is in the first power supply mode, power is stopped to the graphics processing unit and the output interface, and when the electronic device is in the second power supply mode, power is supplied to the graphics processing unit and Stop powering to the output interface.

In an embodiment of the invention, the electronic device further includes a chip set unit. The chip set unit is coupled to the central processing unit and the graphics processing unit. The chipset unit includes a first input and output interface and a second input and output interface. The first input/output interface controls whether the graphics processing unit is powered or not. The second input/output interface controls whether the output interface of the graphics processing unit is powered or not.

In an embodiment of the present invention, when the output interface is coupled to the expansion device, the chip unit is self-expanded through the output interface. The device receives the first notification signal, thereby enabling power supply of the graphics processing unit through the first input/output interface, and enabling power supply of the output interface of the graphics processing unit through the second input/output interface.

In an embodiment of the invention, in the case that the output interface is not coupled to the expansion device, the chip set unit determines that the electronic device is in the first power supply mode or the second power supply mode. When the electronic device is in the first power supply mode, the power supply of the graphics processing unit is disabled through the first input/output interface, and the power supply of the output interface of the graphics processing unit is disabled through the second input/output interface. When the electronic device is in the second power supply mode, the power supply of the graphics processing unit is enabled through the first input/output interface, and the power supply of the output interface of the graphics processing unit is disabled through the second input/output interface.

In an embodiment of the invention, the electronic device further includes a plurality of output buffer units. The central processing unit includes a plurality of interface interfaces for coupling to the output port unit through the connection interface.

The present invention provides a power control method for an electronic device. The electronic device has a central processing unit and a graphics processing unit. In the power control method, in a case where a plurality of output interfaces of the graphics processing unit are coupled to an expansion device, power supply between the graphics processing unit and the output interface is respectively enabled. When the output interface is not coupled to the expansion device, when the electronic device is in a first power supply mode, the power supply of the graphics processing unit and the output interface is disabled, and when the electronic device is in a second power supply mode, The power of the graphics processing unit is disabled and the power of the output interface is disabled.

In an embodiment of the invention, the electronic device described above has a chip set unit. In the power control method, the first input and output of the chip group unit The output interface controls the power supply of the graphics processing unit, and controls whether the output interface of the graphics processing unit is powered by the second input/output interface of the chipset unit.

In an embodiment of the present invention, in the case where the output interface of the graphics processing unit is coupled to the expansion device, the step of enabling the power supply of the graphics processing unit and the output interface respectively includes enabling the first input/output interface Powering the graphics processing unit and powering the output interface of the graphics processing unit through the second input and output interface.

In an embodiment of the invention, in the case that the output interface is not coupled to the expansion device, the electronic device is determined to be in the first power supply mode or the second power supply mode by the chipset unit. When the electronic device is in the first power supply mode, the power supply of the graphics processing unit is disabled through the first input/output interface, and the power supply of the output interface of the graphics processing unit is disabled through the second input/output interface. When the electronic device is in the second power supply mode, the power supply of the graphics processing unit is enabled through the first input/output interface, and the power supply of the output interface of the graphics processing unit is disabled through the second input/output interface.

In an embodiment of the invention, the electronic device further includes a plurality of output buffer units. In the power control method, the central processing unit control includes a plurality of port interfaces for coupling to the output port unit through the port interface.

Based on the above, the electronic device determines whether the graphics processing unit and its output interface are powered based on whether or not the expansion device is coupled and the power supply mode in which it is located. When the output interface of the graphics processing unit is not coupled to the expansion device, the electronic device disables the power supply of the output interface of the graphics processing unit; The output interface of the processing unit is coupled to the expansion device, and when the electronic device can receive an external power source from the expansion device, the power supply of the graphics processing unit can be further enabled. In this way, the electronic device can reduce the power consumption supplied internally, and can have a good power saving effect.

The above described features and advantages of the present invention will be more apparent from the following description.

The present invention provides an electronic device and a power control method, which can determine a power supply mode according to a power supply mode of the electronic device, thereby reducing power consumption in the electronic device when the graphics processing unit processes or outputs image information. In order to make the content of the present invention easier to understand, the following specific embodiments are illustrative of the embodiments of the present invention.

First embodiment

1 is a block diagram of an electronic device 100 in accordance with a first embodiment of the present invention. Referring to FIG. 1 , the electronic device 100 is, for example, a notebook computer, a tablet computer, a personal digital assistant (PDA), a mobile phone, a digital camera, an electronic book, a game machine, or the like. The present invention is not related to the electronic device 100. The type is limited. The electronic device 100 includes a central processing unit (CPU) 110 and a graphics processing unit (GPU) 120. The functions of the above elements are described below.

The central processing unit 110 is used to control the overall operation of the electronic device 100. In this embodiment, the central processing unit 110 can process the operation of the image information. For example, when the user does not need to make the electronic device 100 When processing the higher-performance image information, the electronic device 100 can process the image information through the central processing unit 110.

The graphics processing unit 120 is coupled to the central processing unit 110. For example, the graphics processing unit 120 is coupled to the central processing unit 110 via a PEG (Peripheral Component Interconnect Express Graphic, PCI-E Graphic) bus bar. The graphics processing unit 120 is a microprocessor for specializing in the operation of image information. For example, when the user wants to enable the electronic device 100 to perform processing of the higher-performance image information, the electronic device 100 can process the image information through the graphic processing unit 110. In addition, the graphics processing unit 120 may be disposed on the motherboard of the electronic device 100 together with the central processing unit 110, or the graphics processing unit 120 may be configured on a processing card that is independently but electrically coupled to the central processing unit 110 ( For example, on a graphic card (Graphic card).

Further, the graphics processing unit 120 of this embodiment has multiple output interfaces. The output interfaces 122 and 124 are exemplified herein, but the embodiment does not limit the number of output interfaces. The output interfaces 122 and 124 are, for example, a display port (DP), a video graphics array (VGA) interface, a low-voltage differential signaling (LVDS) interface, and a high-resolution multimedia interface (HDMI). Or a video transmission interface such as a digital video interface (DVI), and the graphics processing unit 120 can be coupled to an external device through the output interfaces 122 and 124 to output processed image information (for example, video stream) to On the external device, the external device is, for example, the expansion device 10 or other electronic device having the same output interface as described above.

In the present embodiment, the output interface 122 can have two sets of display ports, and the output interface 124 can have a set of VGA interfaces, and the graphics processing unit 120 can be coupled to the expansion device 10 through the output interfaces 122 and 124. For example, a docking station. It should be noted that the output interfaces 122 and 124 can be disposed on the same cable, wherein the cable can be selectively coupled to the expansion device 10, that is, the output interfaces 122 and 124 can be coupled to the expansion device 10 at the same time. Not coupled. In addition, it is worth mentioning that since the expansion device 10 can be powered by an external power source (for example, an AC or DC power source), when the graphics processing unit 120 is coupled to the expansion device 10 through the output interfaces 122 and 124, the expansion device The power source of the power supply 10 can be powered to the graphics processing unit 120 via the output interfaces 122 and 124. The electronic device 100 can be powered by the external power source via the expansion device 10, thereby reducing the power consumption of the battery of the electronic device 100.

The steps of the power control method of the present embodiment will be described below with the electronic device 100 described above. 2 is a flow chart of a power control method according to a first embodiment of the present invention. Referring to FIG. 1 and FIG. 2 simultaneously, in step S202, the electronic device 100 detects whether the output interfaces 122 and 124 of the graphics processing unit 120 are coupled to the expansion device 10.

In the case where the output interfaces 122 and 124 of the graphics processing unit 120 are coupled to the expansion device 10, the electronic device 100 enables the power supply of the graphics processing unit 120 and the output interfaces 122 and 124, respectively, as shown in step S204. That is to say, at this time, the expansion device 10 can supply power to the electronic device 100. Therefore, when the electronic device 100 is coupled to the expansion device 10, the power supply of the graphics processing unit 120 and the output interfaces 122 and 124 can be directly enabled. Thereby, the image processing unit 120 can be used to process the image information, and the processed image information is output to the expansion device 10 via the output interface 122 or the output interface 124.

On the other hand, if the output interfaces 122 and 124 of the graphics processing unit 120 are not coupled to the expansion device 10, as shown in step S206, the electronic device 100 further detects that the current power supply mode is in the first power supply. Mode or second power mode. The first power supply mode is, for example, to stop supplying power to the graphics processing unit 120 and the output interfaces 112, 124. The second power supply mode is, for example, only stopping the power supply to the output interfaces 112, 124 of the graphics processing unit 120, and still continue to supply power to the graphics processing. Unit 120. For example, the first power supply mode is a Unified Memory Architecture (UMA) mode, and the second power supply mode is a Discrete mode.

For example, a flag can be set in the firmware or other storable recording medium, and a setting interface or hot key can be provided for the user to set the power supply mode without being coupled to the expansion device. For example, when set to the first power supply mode, the value of the flag is set to 1; when set to the second power supply mode, the value of the flag is set to 0. Accordingly, the electronic device 100 can know that it is currently in the first power supply mode or the second power supply mode by reading the flag. However, the above is merely illustrative and is not intended to be limiting.

It should be noted that when the output interfaces 122 and 124 of the graphics processing unit 120 are not coupled to the expansion device 10, the expansion device 10 does not supply power to the electronic device 100, and the components in the electronic device 100 are required for operation. The power source is then powered by a power supply in the electronic device 100 (for example, electricity) Pool) to supply. For example, the power supply supplies power according to the first power supply mode and the second power supply mode described above.

When the electronic device 100 is in the first power supply mode, as shown in step S208, the electronic device 100 disables the power supply of the graphics processing unit 120 and the output interfaces 122 and 124, respectively. That is to say, the graphics processing unit 120 and the output interfaces 122 and 124 do not receive the power supply, so the graphics processing unit 120 does not process the image information, and cannot output the image information through the output interfaces 1122 and 124. In other words, when the electronic device 100 is in the first power supply mode, the electronic device 100 performs processing of the image information via the central processing unit 110.

On the other hand, when the electronic device 100 is in the second power supply mode, as shown in step S210, the electronic device 100 enables the power supply of the graphics processing unit 120 and disables the power supply of the output interfaces 122 and 124. That is to say, the graphics processing unit 120 can still receive the supply of power to process the image information. However, the output interfaces 122 and 124 do not receive the supply of power. Therefore, the graphics processing unit 120 cannot output image information through the output interfaces 122 and 124. In other words, in the case where the electronic device 100 is in the second power supply mode, the processing of the image information is performed by the graphics processing unit 120. However, the image information processed by the graphics processing unit 120 is not output through the output interfaces 122 and 124, but The video transmission interface (for example, display port, VGA interface, HDMI or DVI, etc.) transmitted to the motherboard through the interface of the central processing unit 110 is output.

In this way, the electronic device 100 can be coupled according to its current graphics processing unit 120 and the expansion device 10, and the electronic device 100 mesh. The previous power supply mode (for example, the first power supply mode or the second power supply mode) controls the power supply of the graphics processing unit 120 and the power supply of the output interfaces 122 and 124. That is, when the electronic device 100 is coupled to the expansion device 10, the electronic device 100 is, for example, in an alternating current (AC) power mode. When the electronic device 100 is not coupled to the expansion device 10, the electronic device 100 is, for example, in a battery power mode. Accordingly, when the electronic device 100 is coupled to the expansion device 10, the power consumption of the battery is not consumed. At this time, the power of the graphics processing unit 120 and its output interfaces 122 and 124 can be all turned on. When the electronic device 100 is in the battery power mode, the power supply to the output interfaces 122, 124 is stopped regardless of the power supply mode, and the power supply of the graphics processing unit 120 is determined according to the power supply mode.

In order to explain the above power supply control method in detail, an embodiment will be described below.

Second embodiment

3 is a block diagram of an electronic device 300 in accordance with a second embodiment of the present invention. Referring to FIG. 1 and FIG. 3 simultaneously, the electronic device 300 in FIG. 3 is similar to the electronic device 100 in FIG. 1 , the difference is that the electronic device 300 in FIG. 3 further includes a chip set unit 130 and an output unit 142 . 144, and the central processing unit 110 has a connection interface 112, 114. In addition, the present embodiment is illustrated by taking two output ports 142, 144 and two port interfaces 112, 114 as an example, but the embodiment does not limit the number of output ports and the port interface. The functions of the above elements are described below.

The chip set unit 130 is coupled to the central processing unit 130 and the graphics processing unit 120. The chip set unit 130 is, for example, a south bridge chip such as a platform controller hub (PCH) to control various input/output interfaces or storage interfaces in the electronic device 300. Alternatively, the chip set unit 130 may also be integrated with a south bridge wafer and a north bridge wafer. Here, the chip set unit 120 has a first input/output interface 132 and a second input/output interface 134. The first input/output interface 132 and the second input/output interface 134 are, for example, a general purpose input/output (GPIO) interface.

The first input/output interface 132 is used to control the power supply of the graphics processing unit 120, that is, the first input/output interface 132 is used to turn on or off the main power of the graphics processing unit 120. The second input/output interface 134 is used to control the power supply of the output interfaces 122 and 124 of the graphics processing unit 120, that is, the output to the output interfaces 122, 124 is electrically closed by the second input/output interface 134. In this embodiment, the second input/output interface 134 can be coupled to a switching device (for example, a metal oxide semiconductor (MOS) switch or a switching device), wherein the switching device is coupled to the power source. The switch device can be turned on or off according to the output signal of the chip set unit 130, so that the control power is transmitted to the output interfaces 122 and 124.

The output buffer units 142 and 144 are, for example, video display interfaces such as a display port, a VGA interface, and an LVDS interface, and are not limited to the above. In the present embodiment, the output units 142 and 144 are disposed on the motherboard of the electronic device 300 together with the central processing unit 110 to output image information processed by the central processing unit 110, for example.

The interface interfaces 112 and 114 of the central processing unit 110 are, for example, output interfaces corresponding to the output ports 142 and 144, and the central processing unit 110 can be coupled to the output ports 142 and 144 via the port interfaces 112 and 114, respectively. Specifically, if the output unit 142 is a display port, the central processing unit 110 can transmit the display signal to the output port unit 142 through the port interface 112. Alternatively, if the output unit 144 is a VGA interface, the central processing unit 110 can transmit the VGA signal to the output unit 144 through the interface 114.

In addition, the materials, arrangement relationships, uses, and functions of the other components of the electronic device 300 in FIG. 3 are similar to those of the electronic device 100 in FIG. 1, and thus will not be described herein.

4 is a flow chart of a power control method according to a second embodiment of the present invention. The power supply control method of this embodiment is applied to the electronic device 300 in the above embodiment. The detailed steps of the power supply control method of the present embodiment will be described below with reference to the components in the electronic device 300 of FIGS. 4 and 3.

Referring to FIG. 3 and FIG. 4 simultaneously, in step S402, the chipset unit 130 determines whether the output interface 122 or 124 receives the notification signal from the expansion device 10, thereby detecting whether the output interfaces 122 and 124 of the graphics processing unit 120 are The expansion device 10 is coupled. For example, the output interfaces 122 and 124 are, for example, disposed in the same cable to simultaneously transmit the display signal and the VGA signal, and when the cable is coupled to the pin in the expansion device 10 (for example, the user will The cable is plugged into the expansion device 10), and the pins in the expansion device 10 generate a high logic potential signal to notify the chip set unit 130. When the chip set unit 130 receives the signal of the high logic potential, the electron can be known. The device 300 is coupled to the expansion device 10.

In the case where the graphics processing unit 120 is coupled to the expansion device 10 through the output interfaces 122 and 124, the chip group unit 130 enables the power supply of the graphics processing unit 120 through the first input/output interface 132, as shown in step S404. Powering the output interfaces 122 and 124 of the graphics processing unit 120 is enabled through the second input and output interface 134. In this case, the output interfaces 122 and 124 of the graphics processing unit 120 are coupled to the expansion device 10, wherein the expansion device 10 receives an external DC power source or an AC power source, so that when the expansion device 10 is coupled to the expansion device 10, the expansion device 10 can be expanded. The device 10 is powered to the electronic device 300, thereby reducing battery power consumption of the electronic device 300. Therefore, in step S404, the power supplied to the graphics processing unit 120 and its output interfaces 122 and 124 is turned on.

On the other hand, if the electronic device 300 is not coupled to the expansion device 10, the chip group unit 130 determines whether the electronic device 300 is in the first power supply mode or the second power supply mode, as shown in step S406. Similar to the step S206 of the first embodiment, the chip set unit 130 of the present embodiment controls the power supply according to the first power supply mode and the second power supply mode, thereby determining whether to utilize the central processing unit 110 or utilize the graphics processing unit. 120 to process image information.

Here, when the electronic device 300 is in the first power supply mode, as shown in step S408, the chip group unit 130 can disable the power supply of the graphics processing unit 120 through the first input/output interface 132, and can pass through the second input/output interface. 134 disables the supply of the output interfaces 122 and 124 of the graphics processing unit 120. For example, the chipset unit 130 can pass through the first input and output The interface 132 causes the power supply in the electronic device 100 to stop transmitting power to the graphics processing unit 120. Moreover, the chip set unit 130 can be controlled to be coupled to the switching device through the second input/output interface 134 for shutting down, thereby stopping the power supply of the power supply to the output interfaces 122 and 124.

From another point of view, since the chipset unit 130 disables the power supply of the graphics processing unit 120 and the output interfaces 122 and 124, the chipset unit 130 does not send image information to the graphics processing unit 120, and the chipset unit 130 does not. The image information is output through the output interfaces 122 and 124 of the graphics processing unit 120. At this time, the chipset unit 130 transmits the image information to the central processing unit 110 to process the image information through the central processing unit 110, and the central processing unit 110 transmits the processed image information to the interface through the interface interfaces 112 and 114. The output units 142 and 144 are output to output image information.

On the other hand, when the electronic device 300 is in the second power supply mode, the chip group unit 130 can enable the power supply of the graphics processing unit 120 through the first input and output interface 132, and can transmit the second input and output through the first input and output interface 132. Interface 134 disables the supply of output interfaces 122 and 124 of graphics processing unit 120. That is, since the chipset unit 130 maintains the power supply of the enable graphics processing unit 120, but disables the power supply of the output interfaces 122 and 124, the image processing unit 120 can still perform image information processing, and then the processed image processing unit 120 The image information is transmitted to the central processing unit 110, and the interface 112, 114 of the central processing unit 110 outputs the processed image information.

Further, when the electronic device 300 is in the second power supply mode In this case, the chipset unit 130 can transmit the image information to the graphics processing unit 120 for processing through a transmission interface (for example, a PEG bus). In addition, the graphics processing unit 120 can also transmit the processed image information to the chipset unit 130 through the transmission interface, and the central processing unit 110 can receive the processed image information from the chipset unit 130, and the processed image is processed. The image information is transmitted to the output ports 142 and 144 through the port interfaces 112 and 114 to output image information.

In this embodiment, the chipset unit 130 can detect whether the output interfaces 122 and 124 of the graphics processing unit 120 are coupled to the expansion device 10. If the detection result is YES, it indicates that the electronic device 300 is in the AC power mode, so the power supply of the graphics processing unit 120 and its output interfaces 122, 124 is directly enabled. If the detection result is negative, indicating that the electronic device 300 is in the battery power mode, the chipset unit 130 can turn off/on the power supply of the graphic processing unit 120 and the output interfaces 122 and 124 according to the power supply mode of the electronic device 300, according to Reduce battery drain. Thereby, the electronic device 300 can have a good power saving effect.

In summary, in the electronic device and the power control method of the embodiment of the present invention, when the output interface of the graphics processing unit is coupled to the expansion device, the electronic device can receive the external power supply from the expansion device, and thus does not consume the electronic device. The power supplied. In addition, when the output interface of the graphics processing unit is not coupled to the expansion device, the electronic device disables the power supply of the output interface of the graphics processing unit to avoid power consumption required to activate the output interface of the graphics processing unit. In this way, the electronic device can have a good power saving effect. In addition, even if a group of displays is cancelled and the LVDS interface is cancelled The graphics processing unit can be used by the connection method of the electronic device 300 in the above embodiment, without using the switching circuit and its peripheral lines, regardless of the graphics processing unit. According to this, the layout placement position and the pull line space can be reduced.

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.

10‧‧‧Expansion device

100, 300‧‧‧ electronic devices

110‧‧‧Central Processing Unit

112, 114‧‧‧Connected interface

120‧‧‧Graphic Processing Unit

122, 124‧‧‧ Output interface

130‧‧‧ Chipset unit

132‧‧‧First input and output interface

134‧‧‧Second input and output interface

142, 144‧‧‧ output unit

S202‧‧‧Detecting whether multiple output interfaces of the graphics processing unit are coupled to the expansion device

S204‧‧‧Enable power supply for graphics processing unit and output interface respectively

S206‧‧‧Detection is currently in the first power supply mode or the second power supply mode

S208‧‧‧ disable the power supply of the graphics processing unit and the output interface respectively

S210‧‧‧Enable power supply to the graphics processing unit and disable the power supply of the output interface

S402‧‧ ‧ is determined by the chipset unit whether the output interface receives the notification signal from the expansion device, and detects whether the plurality of output interfaces of the graphics processing unit are coupled to the expansion device

S404‧‧‧Enable power supply to the graphics processing unit through the first input/output interface, and enable the output interface of the graphics processing unit through the second input/output interface

S406‧‧‧determining, by the chipset unit, that the electronic device is in the first power supply mode or the second power supply mode

S408‧‧ ‧ power supply through the first input and output interface disable graphics processing unit, and power supply through the output interface of the second input/output interface disable graphics processing unit

S410‧‧‧Enable power supply to the graphics processing unit through the first input/output interface, and disable the output of the graphics processing unit through the second input/output interface Interface power supply

1 is a block diagram of an electronic device in accordance with a first embodiment of the present invention.

2 is a flow chart of a power control method according to a first embodiment of the present invention.

3 is a block diagram of an electronic device in accordance with a second embodiment of the present invention.

4 is a flow chart of a power control method according to a second embodiment of the present invention.

10‧‧‧Expansion device

100‧‧‧Electronic devices

110‧‧‧Central Processing Unit

120‧‧‧Graphic Processing Unit

122, 124‧‧‧ Output interface

Claims (10)

An electronic device includes: a central processing unit; and a graphics processing unit coupled to the central processing unit, the graphics processing unit includes a plurality of output interfaces; wherein, when the output interfaces are coupled to an expansion device And supplying power to the graphics processing unit and the output interfaces; wherein, when the output interfaces are not coupled to the expansion device, when the electronic device is in a first power supply mode, power supply is stopped to the graphics processing And the output interface, when the electronic device is in a second power supply mode, supplies power to the graphics processing unit and stops supplying power to the output interfaces. The electronic device of claim 1, further comprising: a chip set unit coupled to the central processing unit and the graphics processing unit, the chip set unit comprising: a first input/output interface for controlling the graphic Whether the processing unit is powered or not; and a second input/output interface that controls whether the output interface of the graphics processing unit is powered or not. The electronic device of claim 2, wherein the chipset unit receives a first notification signal from the expansion device through the output interfaces when the output device is coupled to the expansion device , enabling the graphics processing unit through the first input/output interface Powering, and enabling power to the output interfaces of the graphics processing unit through the second input and output interface. The electronic device of claim 2, wherein the chipset unit determines that the electronic device is in the first power supply mode or the second power supply mode if the output interfaces are not coupled to the expansion device When the electronic device is in the first power supply mode, the power supply of the graphics processing unit is disabled through the first input/output interface, and the power supply of the output interfaces of the graphics processing unit is disabled through the second input/output interface. When the electronic device is in the second power supply mode, the power supply of the graphics processing unit is enabled through the first input/output interface, and the power supply of the output interfaces of the graphics processing unit is disabled through the second input/output interface. . The electronic device of claim 1, further comprising: a plurality of output ports, wherein the central processing unit comprises a plurality of port interfaces, respectively, to which the output ports are respectively coupled through the connection interfaces. A power control method for an electronic device, wherein the electronic device has a central processing unit and a graphics processing unit, the power control method includes: coupling a plurality of output interfaces of the graphics processing unit to an expansion device And enabling the power supply of the graphics processing unit and the output interfaces respectively; and in the case that the output interfaces are not coupled to the expansion device, when the electronic device is in a first power supply mode, respectively, the power is disabled The graphics processing unit and the output interfaces are powered; and when the electronic device is in a second power supply mode, enabling power to the graphics processing unit and disabling power to the output interfaces. The power control method of claim 6, wherein the electronic device has a chip set unit, the power control method further comprising: controlling the graphic processing unit by a first input/output interface of the chip set unit Powering or not; and controlling whether the output interfaces of the graphics processing unit are powered by a second input/output interface of the chipset unit. The power supply control method of claim 7, wherein the graphics processing unit and the output interfaces are respectively powered when the output interfaces of the graphics processing unit are coupled to the expansion device. The method includes: enabling power supply of the graphics processing unit through the first input/output interface; and enabling power supply of the output interfaces of the graphics processing unit through the second input/output interface. The power control method of claim 7, wherein the power control method further comprises: determining, by the chip set unit, that the electronic device is in the first state, wherein the output interfaces are not coupled to the expansion device a power supply mode or the second power supply mode; when the electronic device is in the first power supply mode, the power supply of the graphics processing unit is disabled through the first input/output interface, and the second The input/output interface disables power supply of the output interfaces of the graphics processing unit; and enables the power supply of the graphics processing unit through the first input/output interface when the electronic device is in the second power supply mode, and transmits the The two input and output interfaces disable the supply of the output interfaces of the graphics processing unit. The power control method of claim 6, wherein the electronic device further includes a plurality of output ports, and the central processing unit includes a plurality of port interfaces, respectively, to be coupled to the port through the port interfaces Some output units.