CN103901959B - Mainboard and power management method thereof - Google Patents

Abstract

The invention discloses a mainboard which is applied to various power supplies with different load driving capacities. The power supply provides a supply voltage source to the motherboard. The mainboard includes: a comparator; the reference voltage generating circuit outputs reference voltage coupled to one input end of the comparator; a power load having a power output terminal coupled to the supply voltage source and a control terminal coupled to an output terminal of the comparator; an interface voltage; a potential determining resistor coupled to the interface voltage; the expansion card slot is used for the electric insertion of the expansion card and is provided with a state pin coupled with the potential determining resistor and the other input end of the comparator. When the expansion card is inserted into the expansion card slot, the power load is closed; otherwise, the power load is turned on to increase the output load of the supply voltage source.

Description

Motherboard and its power management method

【Technical field】

The invention relates to a circuit board and its power management method, in particular to a motherboard and its power management method.

【Background technique】

In the early computers, at least a central processing unit (CPU), a graphics card (graphics card), and a memory module (memory module) had to be installed on the motherboard to start up normally, and then enter the operating system (OS) to operate normally. . With the advancement of integrated circuit manufacturing capabilities, more and more functions are integrated into the same chip. Further integration with the CPU. In addition, today's motherboards seldom require an additional sound card to provide sound effects, so the number of additional components that need to be inserted on the motherboard is getting smaller and smaller.

Moreover, the integrated circuit process capability has reached the technical level of the nanometer (nanometer, 10 to the minus 9th square meter) level. In addition to the above, more and more functions can be integrated on the same chip, and the operating frequency of the circuit can be increased. In addition, the power consumption required by the chip is getting less and less, so that the motherboard circuit that mainly runs on a large number of integrated circuits, the overall system power consumption is also getting less and less, even in some low-power operation Under the application scenario, its overall power consumption is less than 5 watts (Watt).

Therefore, in the current application situation of the power supply unit (PSU) in the computer device, the maximum supply power is no longer a problem. However, for some commercially available power supplies, the supply voltage source is generally a positive 12 volt power supply. When the output load is too light, such as the output current is less than 0.8 amperes, the voltage regulation function will start to appear abnormal, and even Start its low current protection (under current protection) mechanism, and automatically cut off its power output. For example, when the computer device starts the boot program code, the overall power consumption of the system will be quite small during a certain period of time during the boot process. For example, the power consumption of the central processing unit is less than 6 watts. At this time, if the computer device is equipped with the above If the power supply is not installed, it will automatically cut off the power output, causing the computer device to fail to boot normally, and it is impossible to enter the operating system.

Since there are many users who purchase the various components required by the computer device and assemble the whole computer system by themselves, it is unavoidable for them to purchase the above-mentioned power supply and encounter the above-mentioned problems. At present, there are mainly two ways to solve the problem: first, the power supply is attached with a dummy load. The female socket is connected to the supply voltage source of the power supply, such as a positive 12 volt voltage source, so that the output load of the supply voltage source is continuously maintained above the set value for normal operation. However, this method makes the power supply always have unnecessary output load, which may result in failure to pass the 80 PLUS international specification for the power supply. Second, the manufacturer inserts a set of fixed dummy loads on the motherboard, which has the same purpose as the first method, but may cause the computer device to fail the Energy Star (Energy Star) specification.

【Content of invention】

In view of the above problems, the present invention provides a mainboard and a power management method thereof, so that the mainboard can be applied to different power supplies while maintaining the optimization of system power efficiency.

In order to solve the above problems, the present invention proposes a motherboard, which is applied to different power supplies. The power supply provides a supply voltage source to the motherboard. The motherboard includes a power control circuit and an expansion card slot. The power control circuit includes a comparator, a reference voltage generating circuit, a power load, an interface voltage, and a potential determining resistor. The comparator has a first comparison input, a second comparison input, and a comparison output. The reference voltage generation circuit is coupled to the second comparison input end and outputs a reference voltage. The power load has a control terminal and a power output terminal, wherein the power output terminal is coupled to the supply voltage source, and the control terminal is coupled to the comparison output terminal. The potential determining resistor is coupled to the interface voltage. The expansion card slot is for electrical insertion of the expansion card, and has a status pin coupled to the potential determining resistor and the first comparison input end. Wherein, the status pin is normally coupled to the interface voltage, so that the voltage of the status pin is between the interface voltage and the reference voltage, or equal to the interface voltage. The comparator outputs the first output voltage to the power load to turn on the power load and increase the output load of the supply voltage source. And when the expansion card is inserted into the expansion card slot, the voltage of the expansion card determines the state pin is not between the interface voltage and the reference voltage, and is not equal to the interface voltage, the comparator outputs the second output voltage to the power load to turn off the power load.

The invention further proposes a mainboard, which is applied in a computer system and is suitable for various power supplies with different load driving capabilities. The power supply provides a supply voltage source to the motherboard. The motherboard includes control components as well as power loads. The control component has a power-on status output pin. The power load has a control terminal and a power output terminal. The power output end is coupled to the supply voltage source, and the control end is coupled to the power-on state output pin. Wherein, when the computer system executes the boot program code and sends a boot signal to the control component, the boot status output pin of the control component outputs the first output voltage to the power load according to the boot signal, so as to turn on the power load and increase the output load of the supply voltage source. And when the computer system completes the boot program code, the boot state output pin of the control component outputs the second output voltage to the power load to turn off the power load.

The present invention further proposes a power management method for a motherboard, which includes the following steps:

A power supply is used to provide a supply voltage source to the power load of the motherboard. The reference voltage generating circuit of the motherboard outputs a reference voltage. Use a comparator on the main board to judge whether the expansion card slot of the main board is inserted with an expansion card. If not, the voltage of a state pin of the expansion card slot is between the interface voltage and the reference voltage, or equal to the interface voltage. The device outputs the first output voltage to the power load to turn on the power load and increase the output load of the supply voltage source; if so, the expansion card determines that the voltage of the status pin is not between the interface voltage and the reference voltage, and is not equal to the interface voltage. The comparator outputs the second output voltage to the power load to turn off the power load.

The invention also proposes a main board power management method, which is applied to a computer system. The power management method includes the following steps:

A power supply is used to provide a supply voltage source to the power load of the motherboard. Start the computer system to execute the boot program code, and send the boot signal to the control unit of the main board. The power-on state output pin of the control component outputs the first output voltage to the power load according to the power-on signal, so as to turn on the power load and increase the output load of the supply voltage source. When the computer system completes the boot program code, the boot state output pin of the control component outputs the second output voltage to the power load to turn off the power load.

The effect of the present invention is that, by means of the control circuit on the motherboard and its power management method, when the output load of the supply voltage source may be too low, it provides an additional output load, and in the use situation that does not require an additional output load It is turned off, so that the supply voltage source can work normally under various states, so that the mainboard including the present invention can be adapted to different power supplies, and at the same time, the efficiency optimization of the system power can be taken into consideration.

Regarding the features, implementation and effects of the present invention, the preferred embodiments are described in detail below in conjunction with the drawings.

【Description of drawings】

The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

FIG. 1 is a schematic block diagram of a motherboard according to a first embodiment of the present invention.

FIG. 2 is a flowchart of the power management of the motherboard according to the first embodiment of the present invention.

FIG. 3 is a schematic circuit diagram of a reference voltage generating circuit of a motherboard according to a first embodiment of the present invention.

FIG. 4 is a schematic circuit diagram of the power load of the motherboard according to the first embodiment of the present invention.

FIG. 5 is a schematic block diagram of a motherboard according to a second embodiment of the present invention.

FIG. 6 is a flowchart of the power management of the motherboard according to the second embodiment of the present invention.

FIG. 7 is a schematic block diagram of a motherboard according to a third embodiment of the present invention.

FIG. 8 is a flowchart of a power management method for a motherboard according to a third embodiment of the present invention.

FIG. 9 is a schematic block diagram of a motherboard according to a fourth embodiment of the present invention.

FIG. 10 is a flowchart of a power management method for a motherboard according to a fourth embodiment of the present invention.

FIG. 11 is a schematic circuit diagram of a voltage level conversion circuit of a motherboard according to a fourth embodiment of the present invention.

Description of main component symbols:

100, 200, 400, 500 Motherboard 110 Comparator

111 First comparison input 112 Second comparison input

113 Comparison output terminal 120 Reference voltage generating circuit

121 Reference voltage 130 Power load

131 Control terminal 132 Power output terminal

140 Expansion card slot 141 Status pins

150 Potential determining resistor 160 Supply voltage source

170 Interface voltage 180 Control circuit enabling switch

185 Disable voltage 190 Enable control terminal

195 Power control circuit 210 First reference resistor

220 Second reference resistor 230 Ground terminal

310 power resistor 320 switch assembly

410 Control component 411 Power-on state output pin

510 Voltage level conversion circuit 511 Input terminal

512 output terminal 610 level switching resistor

620 level switch

【Detailed ways】

In the description and the following claims, the word coupled here includes any direct and indirect electrical connection means. Therefore, if it is described that a first device is coupled to a second device, it means that the first device may be directly electrically connected to the second device, or indirectly electrically connected to the second device through other devices or connection means. In addition, the positive-phase signal is the state of a digital logic signal, or it can be understood as the state of a general digital logic signal is 1, and the negative-phase signal is the state of another digital logic signal, or it can be understood that the state of a general digital logic signal is 0.

FIG. 1 is a schematic block diagram of a motherboard 100 disclosed in a first embodiment of the present invention. The motherboard 100 is used in a computer device, and is suitable for power supplies (not shown) with different load driving capabilities, and the power supply provides a supply voltage source 160 to the motherboard 100, for example, a positive 12 volt The output of the voltage source is used for the power required by the motherboard 100 and components plugged thereon, such as hard drives and expansion cards. The motherboard 100 includes a power control circuit 195 and an expansion card slot 140 . The power control circuit 195 includes a comparator 110 , a reference voltage generating circuit 120 , a power load 130 , a potential determining resistor 150 and an interface voltage 170 .

As shown in FIG. 1 , the comparator 110 has a first comparison input terminal 111 , a second comparison input terminal 112 and a comparison output terminal 113 . Wherein when the voltage of the first comparison input terminal 111 is less than the voltage of the second comparison input terminal 112, the comparator 110 outputs the first output voltage; and when the voltage of the first comparison input terminal 111 is greater than the voltage of the second comparison input terminal 112, the comparator The device 110 outputs a second output voltage.

The reference voltage generation circuit 120 is coupled to the second comparison input terminal 112 of the comparator 110 for outputting a reference voltage 121 as a voltage reference level for comparison by the comparator 110 in this embodiment.

The power load 130 has a control terminal 131 and a power output terminal 132, wherein the power output terminal 132 is coupled to the supply voltage source 160, the control terminal 131 is coupled to the comparison output terminal 113 of the comparator 110, and the comparator 110 is controlled by the control terminal 131. Turning on and off of the power load 130 . In addition, in the present invention, the power load 130 may be, but not limited to, a high power load above the watt level.

One end of the potential determining resistor 150 is coupled to the interface voltage 170 , and the other end is coupled to the expansion card slot 140 . As shown in FIG. 1 , the expansion card slot 140 is used for inserting an expansion card, for example, an expansion card such as a display card or a memory is electrically inserted therein. The expansion card slot 140 has a status pin 141 coupled to the first comparison input 111 of the comparator 110 , and the potential determining resistor 150 is coupled to the status pin 141 of the expansion card slot 140 . In addition, the expansion card slot 140 may be an expansion card slot for a video graphic array (VGA) display card, or an expansion card slot supporting peripheral component interconnect express (PCI-E) , but not limited to this.

FIG. 2 is a flowchart of the power management of the mainboard according to the first embodiment of the present invention. The operation of the control circuit is described in conjunction with the schematic block diagram of the mainboard 100 shown in FIG. 1 as follows: as shown in step 250, the power supply Provides a supply voltage source to the power load of the motherboard. As shown in step 260, the comparator judges whether the expansion card slot of the motherboard is inserted with an expansion card, if not, then as shown in step 270, the voltage of the status pin of the expansion card slot is between the interface voltage and the reference voltage , wherein the voltage of the state pin is different from the reference voltage and is close to or equal to the interface voltage, at this time the comparator outputs the first output voltage to the power load to turn on the power load and increase the output load of the supply voltage source; if so, Then, as shown in step 280, the voltage of the setting status pin of the expansion card is not between the interface voltage and the reference voltage, that is, it is not equal to the interface voltage. At this time, the comparator outputs the second output voltage to the power load to turn off the power load. .

For example, if the interface voltage 170 is greater than the reference voltage 121, when the expansion card is not inserted in the expansion card slot 140, the status pin 141 is coupled to the interface voltage 170 through the potential determining resistor 150, and a voltage greater than the reference voltage is generated at the status pin 141. The voltage value of the voltage 121 . At this time, the comparator 110 outputs the first output voltage to the control terminal 131 of the power load 130 after comparison, so as to turn on the power load 130 , that is, to provide an additional output load to the supply voltage source 160 . Conversely, when the expansion card is inserted into the expansion card slot 140, the expansion card will set the voltage of the status pin 141, and a voltage lower than the reference voltage 121 will be generated at the status pin 141. At this time, the comparator 110 outputs the first voltage after comparison. Two output voltages are sent to the control terminal 131 of the power load 130 to turn off the power load 130 , that is, no additional output load of the supply voltage source 160 will be caused.

As another example, in other embodiments of the present invention, the interface voltage 170 can also be set to a state lower than the reference voltage 121, so when the expansion card is not inserted in the expansion card slot 140, the status pin 141 Coupled to the interface voltage 170 via the potential determining resistor 150, a voltage lower than the reference voltage 121 is generated at the state pin 141, and the comparator 110 outputs the first output voltage to the control terminal 131 of the power load 130 after comparison at this time to turn on the power The load 130 provides an additional output load to the supply voltage source 160; otherwise, when the expansion card is inserted into the expansion card slot 140, the expansion card will set the voltage of the state pin 141, so that the state pin 141 generates a If the voltage is greater than the reference voltage 121 , the comparator 110 outputs the second output voltage to the control terminal 131 of the power load 130 after comparison, so as to turn off the power load 130 , that is, no additional output load of the supply voltage source 160 will be caused.

The effect of this embodiment is to prevent the output load of the supply voltage source 160 from being too low when the expansion card is not inserted into the mainboard 100, causing the power supply to not work normally, and even activating the protection mechanism to automatically shut down the action, and then A problem occurs that makes the computer device unusable. Moreover, when the expansion card is inserted into the mainboard 100, the power control circuit 195 will not form redundant output load on the supply voltage source 160, so the power supply can exert the best power supply efficiency.

Therefore, it is determined whether to provide an additional output load to the supply voltage source 160 according to whether the expansion card is plugged into the mainboard 100, so that the supply voltage source 160 of the power supply can work normally under various states, A balance point is also achieved in the optimization of the system power of the computer device, so that the loads output by the supply voltage source 160 of the power supply are all purposeful outputs rather than ineffective waste.

In addition, as shown in FIG. 3 , in the present invention, the reference voltage generation circuit 120 may include a first reference resistor 210 and a second reference resistor 220 . The first reference resistor 210 is coupled between the interface voltage 170 and the reference voltage 121 , and the second reference resistor 220 is coupled between the reference voltage 121 and the ground terminal 230 . As mentioned above, the reference voltage 121 is used as a voltage reference level for comparison by the comparator 110 . For example, when the expansion card is inserted into the expansion card slot 140, the voltage of the status pin 141 is set through the relevant circuit on the expansion card, such as connecting the status pin 141 to the ground terminal 230 to make the two voltages equal; When the expansion card is not inserted into the expansion card slot 140 , the voltage of the status pin 141 is formed through the coupling of the potential determining resistor 150 , for example, the voltage of the status pin 141 is equal to the interface voltage 170 . In addition, since the reference voltage 121 is formed by dividing the interface voltage 170 by the first reference resistor 210 and the second reference resistor 220 , the insertion status of the expansion card can be known through the comparison result of the comparator 110 .

In addition, since the reference voltage 121 is determined by the voltage division of the first and second reference resistors 210, 220, it can be considered that the magnitude of the surrounding noise is different under different circuit operation conditions, such as the expansion card inserted compared to the unplugged Insert the expansion card to optimize the design. For example, when an expansion card is inserted into the expansion card slot 140 of the motherboard 100, it may cause relatively large ambient noise to the power control circuit 195, and at this time, the voltage of the status pin 141 is the voltage of the ground terminal 230, so the reference voltage can be 121 is designed to be greater than half of the interface voltage 170, so that the input difference of the comparator 110 is relatively large, that is, it has a better ability to suppress noise, so as to ensure that the comparator can obtain a better comparison result.

FIG. 4 is a schematic circuit diagram of the power load 130 of the motherboard 100 disclosed in the first embodiment of the present invention. In this embodiment, the power load 130 may include a power resistor 310 and a switch assembly 320 . The power resistor 310 is connected in series with the channel of the switch component 320 and coupled between the power output terminal 132 and the ground terminal 230 . The control terminal of the switch component 320 is the control terminal 131 of the power load 130 . When the switch element 320 receives the first output voltage and turns on, the power resistor 310 forms an output load between the supply voltage source 160 and the ground terminal 230, for example, the supply voltage source 160 is positive 12 volts, and the power resistor 310 is 24 ohms. ohms, then when the switch element 320 is turned on, the current on it is 0.5 ampere. It should be noted that the power resistor 310 will consume 6 watts of power at this time, so its power consumption needs to be considered, and the power resistor 310 should be implemented with a resistor that can withstand high power consumption, such as a cement resistor.

FIG. 5 is a schematic block diagram of a motherboard 200 according to a second embodiment of the present invention. The difference between the motherboard 200 of this embodiment and the motherboard 100 disclosed in the first embodiment is that the motherboard 200 disclosed in the second embodiment of the present invention further includes a control circuit enabling switch 180, a disabling voltage 185 and Enable the control terminal 190 . The channel of the control circuit enabling switch 180 is coupled between the comparison output terminal 113 of the comparator 110 and the disabling voltage 185 . The control circuit enabling switch 180 includes a device control terminal coupled to the enable control terminal 190 .

FIG. 6 is a flowchart of the power management of the motherboard according to the second embodiment of the present invention. The operation of its power control circuit 195 is described in conjunction with the block diagram of the motherboard 200 shown in FIG. 5 as follows, wherein steps 650, 660, 670, and 680 correspond to steps 250, 260, 270, and 280 of the first embodiment in FIG. 2 , and the two are roughly the same, and will not be repeated here.

In the second embodiment of the present invention, as shown in step 652, it is determined whether the motherboard sends a disabling control signal to the enabling control terminal, and if so, as shown in step 654, the channel of the control circuit enabling switch is turned on, and The enable control terminal is coupled to the disabling voltage through the control circuit enable switch, so that the power load is normally turned off; if not, that is, the enable control terminal receives an enable control signal from the main board, then the control circuit enable switch The channel is cut off, and the action flow after step 660 is continued, that is, the power load is turned on and off determined by the voltage output by the comparator, which can refer to the description related to FIG. 2 in the first embodiment. Wherein, the enabling control signal and the disabling control signal can be set in hardware or software by using a jump circuit on the motherboard, a microprocessor or a microcontroller.

As shown in FIG. 5 , in the second embodiment of the present invention, the purpose of the configuration of the control circuit enable switch 180 and the enable control terminal 190 is that the motherboard 200 can actively determine whether the output of the supply voltage source 160 will When it is low, it does not work normally, for example, it can be judged by identifying the product number. When the mainboard 200 judges that the output of the supply voltage source 160 will not work normally when the load is too low, the mainboard 200 can send a disabling control signal to the enabling control terminal 190 to normally turn off the power load 130, To avoid unnecessary power consumption; otherwise, an enable control signal is sent to enable the power load 130 to be turned on or off in a timely manner, so as to ensure the normal operation of the supply voltage source 160 . In this way, not only can the supply voltage source 160 work normally in various states, but also a balance point can be achieved in optimizing the efficiency of the system power, so that the load output by the supply voltage source 160 is a purposeful output, and Not purposeless waste.

FIG. 7 is a schematic block diagram of a motherboard 400 according to a third embodiment of the present invention. FIG. 8 is a flowchart of a power management method of the motherboard 400 according to the third embodiment of the present invention. The motherboard 400 disclosed in the third embodiment of the present invention is applied in a computer system. The motherboard 400 includes a control component 410 and a power load 130, wherein the control component 410 has a power-on status output pin 411, and the power load 130 includes a control terminal 131 and a power output terminal 132, the control terminal 131 is coupled to the control component 410, and The power output terminal 132 is coupled to the power supply terminal 160 of the power supply. The control component 410 of the motherboard 400 controls the power load 130 to be turned on and off according to the power-on status of the computer system.

The power management method of the motherboard 400 in FIG. 8 is described in conjunction with the schematic block diagram of the motherboard 400 shown in FIG. Power load 130 . As shown in step 830, start the computer system to execute the boot program code, and send a boot signal to the control unit 410 of the motherboard. As shown in step 850, the power-on state output pin 411 of the control component 410 outputs the first output voltage to the power load 130 according to the power-on signal, so as to turn on the power load 130 and increase the output load of the supply voltage source 160, wherein the control component 410 can be Generally, operating components such as a microcontroller (microcontroller) or a southbridge chipset are common on the motherboard, but not limited thereto. Next, as shown in step 870, it is determined whether the computer device has completed the boot program code, and if so, as shown in step 890, the power-on state output pin 411 of the control component 410 outputs a second output voltage to the power load 130 to turn off the power load 130 ; if not, return to the action flow of step 850 .

The effect of this embodiment is to prevent the computer system from running the boot program code. For the supply voltage source 160, the output load may be too low, which will cause the supply voltage source 160 to work abnormally and even start the protection mechanism. The action of automatic shutdown will cause the computer system to be unable to use normally. Therefore, use the power-on status output pin 411 to control the power load 130 to be turned on and off according to the power-on state of the computer system, and accordingly provide an additional output load to the supply voltage source 160, that is, if the computer device is not powered on, the power load 130 provides An additional output load is given to the supply voltage source 160, and when the computer device has been powered on, the control component 410 shuts down the power load 130, so that not only the supply voltage source 160 can work normally in various states, but also the system power A balance point is achieved in the optimization of efficiency, so that the load output by the supply voltage source 160 is a purposeful output rather than an ineffective waste.

FIG. 9 is a schematic block diagram of a motherboard 500 according to a fourth embodiment of the present invention. This embodiment is substantially the same in structure as the motherboard disclosed in the third embodiment. The difference between the two is that the motherboard disclosed in the third embodiment further includes a voltage level conversion circuit 510, which has an input terminal 511 and The output terminal 512 and the input terminal 511 are coupled to the power-on state output pin 411 of the control component, and the output terminal 512 is connected to the control terminal 131 of the power load 130 . The voltage level conversion circuit 510 is used to convert the logic voltage level of the power-on status output pin 411 into a predetermined voltage level of the control terminal 131 , such as the voltage of the supply voltage source 160 . For example, the power-on state output pin 411 is implemented as a general purpose input output (GPIO) pin of a microcontroller, and its logic voltage level may be 3.3 volts, and the switch components in the power load 130 are implemented as It is realized by an N-type metal oxide semiconductor field effect transistor (N-MOSFET), and its withstand voltage meets the requirement of the supply voltage source 160 . Since the voltage of 3.3 volts may not be able to effectively turn on the switch components of the power load 130, resulting in a decrease in the output load formed by the power load 130, which affects the desired efficacy of the present invention, so the voltage level conversion circuit 510 can be used The level of 3.3 volts is converted into a voltage of the supply voltage source 160 , for example, a predetermined voltage level of positive 12 volts, so as to effectively turn on the switch element and exert the intended effect of the present invention.

FIG. 10 is a flowchart of a power management method of the motherboard 500 according to the fourth embodiment of the present invention. The power management method in FIG. 10 is described below with reference to the block diagram of the motherboard 500 disclosed in FIG. 9 . Wherein, for steps 1010 and 1030, reference may be made to the related description of steps 810 and 830 of the third embodiment in FIG. 8 . Next, as shown in step 1050, the power-on state output pin 411 of the control component 410 outputs the first output voltage according to the power-on signal, and is converted to a predetermined voltage level by the voltage level conversion circuit 510 to the power load 130 to turn on the power load 130 , and increase the output load of the supply voltage source 160 . Then, as shown in step 1070, it is determined whether the computer device has completed the boot program code, and if so, as shown in step 1090, the boot state output pin 411 of the control component 410 outputs a second output voltage, and the second output voltage is passed through the voltage level conversion circuit 510 After being converted to a predetermined voltage level, it is sent to the power load 130 to turn off the power load 130; if not, return to the action flow of step 1050 .

As shown in FIG. 11 , in the motherboard 500 disclosed in the fourth embodiment of the present invention, the voltage level conversion circuit 510 may include a level conversion resistor 610 and a level conversion switch 620 , and the level conversion resistor 610 and the level conversion resistor 610 Channels of the bit switch 620 are connected in series and coupled between the supply voltage source 160 and the ground terminal 230 . The control terminal of the level conversion switch 620 is the input terminal 511 of the voltage level conversion circuit 510 . For example, the level changeover switch 620 is realized by an NMOS field effect transistor. When the input terminal 511 is 3.3 volts, that is, the positive phase signal 1 of the 3.3 volt logic level, the level changeover switch 620 conduction, the output terminal 512 is the voltage of the ground terminal 230, that is, 0 volts; and when the input terminal 511 is 0 volts, that is, the inverse signal 0 of the logic level of 3.3 volts, the level changeover switch 620 is turned off, The output terminal 512 is the voltage of the supply voltage source 160 , for example, positive 12 volts.

It should be noted that, from the perspective of a logic circuit, the voltage level conversion circuit 510 implements the function of an inverter, but the logic voltage levels of its input terminal 511 and output terminal 512 are different, so the third aspect of the present invention Compared with the fourth embodiment, in order to control the same power load 130 , the output logic of the power-on state output pin 411 of the two embodiments must be opposite to each other. However, if an inverter is added to the voltage level conversion circuit 510 of the fourth embodiment, the output logic of the power-on state output pin 411 of the two embodiments can be a non-inverting signal. Therefore, the above-mentioned embodiments are only used as examples of the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can design various control circuits according to the actual needs of the circuit design. The design of the components can be changed without departing from the spirit disclosed in the present invention.

The effect of the present invention is that, by means of the control circuit on the main board and the control method thereof, when the output load of the supply voltage source may be too low, an additional output load is provided, and in the use condition that no additional output load is required By turning it off, the power supply can work normally in various states, so that the main board disclosed by the present invention can be applied to different power supplies, and at the same time, it can optimize the efficiency of the system power.

Although the embodiments of the present invention are disclosed as above, they are not intended to limit the present invention. Anyone skilled in the relevant art can use the shapes, structures, and features described in the application scope of the present invention without departing from the spirit and scope of the present invention. and quantity can be slightly changed, so the scope of patent protection of the present invention must be defined by the appended claims of this specification.

Claims (16)

1. A motherboard, applied to power supplies with different load driving capabilities, the power supply provides a supply voltage source to the motherboard, characterized in that the motherboard includes: A power control circuit, including: A comparator has a first comparison input terminal, a second comparison input terminal, and a comparison output terminal; a reference voltage generating circuit coupled to the second comparison input and outputting a reference voltage; A power load having a control terminal and a power output terminal, wherein the power output terminal is coupled to the supply voltage source, and the control terminal is coupled to the comparison output terminal; an interface voltage; and a potential-determining resistor coupled to the interface voltage; and an expansion card slot for electrically inserting an expansion card, the expansion card slot has a state pin, and the state pin is coupled between the potential determining resistor and the first comparison input end of the comparator ; Wherein, the state pin is normally coupled to the interface voltage, and the voltage of the state pin is between the interface voltage and the reference voltage, and is different from the reference voltage, and the comparator outputs a first output voltage to the power load to turn on the power load and increase the output load of the supply voltage source; and when the expansion card is inserted into the expansion card slot, the expansion card is set If the voltage of the status pin is not between the interface voltage and the reference voltage, the comparator outputs a second output voltage to the power load to turn off the power load. 2. The motherboard according to claim 1, wherein the interface voltage is greater than the reference voltage, and the voltage of the status pin is greater than the reference voltage, and the comparator outputs the first output voltage to the power load, and when the expansion card is inserted into the expansion card slot, the voltage of the status pin is lower than the reference voltage, and the comparator outputs the second output voltage to the power load. 3. The motherboard according to claim 1, wherein the interface voltage is lower than the reference voltage, and when the voltage of the status pin is lower than the reference voltage, the comparator outputs the first an output voltage to the power load, and when the expansion card is inserted into the expansion card slot, the voltage of the status pin is greater than the reference voltage, and the comparator outputs the second output voltage to the the power load described above. 4. The motherboard according to claim 1, wherein the reference voltage generation circuit comprises a first reference resistor and a second reference resistor, the first reference resistor is coupled between the interface voltage and the The second reference resistor is coupled between the reference voltage and a ground terminal. 5. The motherboard according to claim 1, wherein the voltage of the status pin is normally equal to the interface voltage, and when the expansion card is inserted into the expansion card slot, the status pin The voltage is equal to the voltage of the ground terminal of the motherboard. 6. The motherboard according to claim 1, wherein the power load further comprises a power resistor and a switch component, the power resistor is coupled between the supply voltage source and a channel of the switch component Between, the channel is coupled between the power resistor and a ground terminal, when the comparator outputs the first output voltage to the power load, the channel is turned on to turn on the power load, and When the comparator outputs the second output voltage until the power load cuts off the channel, the power load is turned off. 7. The motherboard according to claim 1, further comprising a control circuit enable switch, a disable voltage and an enable control terminal, the control circuit enable switch is coupled to the comparator between the comparison output terminal, the disable voltage, and the enable control terminal, and the control terminal is coupled to the disable voltage via the control circuit enable switch, the power load is normally off, and when The enable control terminal cuts off the channel of the enable switch of the control circuit, and the power load is turned on and off determined by the voltage output by the comparator. 8. A motherboard, applied in a computer system, and suitable for power supplies with different load driving capabilities, the power supply provides a supply voltage source to the motherboard, characterized in that the motherboard Including: A control component has a power-on state output pin; and A power load has a control terminal and a power output terminal, the power output terminal is coupled to the supply voltage source, and the control terminal is coupled to the power-on state output pin; Wherein, when the computer system executes a boot program code and sends a boot signal to the control component, the boot state output pin of the control component outputs a first output voltage to the power load according to the boot signal, so as to Turn on the power load and increase the output load of the supply voltage source, and when the computer system completes the boot program code, the power-on state output pin of the control component outputs a second output voltage to the power load , to turn off the power load. 9. The motherboard according to claim 8, wherein the control component is a microcontroller chip or a south bridge chipset. 10. The motherboard according to claim 8, wherein the power load further comprises a power resistor and a switch component, and the power resistor is coupled between the supply voltage source and one end of the channel of the switch component Between, the channel of the switch component is coupled between the power resistor and a ground terminal, the component control terminal of the switch component is coupled to the control terminal, when the power-on state output pin outputs the first an output voltage to the power load, the channel of the switch component is turned on to turn on the power load, and when the power-on state output pin outputs the second output voltage to the power load, the switch component channel cutoff, the power load is turned off. 11. The motherboard according to claim 8, further comprising a voltage level conversion circuit, including an input terminal and an output terminal; the input terminal is connected to the power-on state output pin of the control component, The output terminal is connected to the control terminal of the power load, and is used for converting the logic voltage level of the power-on state output pin into a predetermined voltage level of the control terminal. 12. The motherboard according to claim 11, wherein the voltage level conversion circuit further comprises a level conversion resistor and a level conversion switch, the level conversion resistor is coupled to the supply voltage Between the source and the output terminal of the voltage level conversion circuit, the channel of the level conversion switch is coupled between the output terminal of the voltage level conversion circuit and a ground terminal, and the channel of the level conversion switch The component control terminal is coupled to the input terminal of the voltage level conversion circuit. 13. A power management method for a motherboard, comprising the following steps: using a power supply to provide a supply voltage source to a power load of the motherboard; A reference voltage generating circuit of the motherboard outputs a reference voltage; and Using a comparator on the main board to determine whether an expansion card is inserted into an expansion card slot on the main board; If not, the voltage of a state pin of the expansion card slot is between the interface voltage and the reference voltage, and is different from the reference voltage, and the comparator outputs a first output voltage to the power load to turn on the power load and increase the output load of the supply voltage source, If yes, the expansion card sets the voltage of the status pin not between the interface voltage and the reference voltage, and the comparator outputs a second output voltage to the power load to turn off the power load. load. 14. The power management method of the motherboard according to claim 13, further comprising the following steps: If a channel of a control circuit enabling switch of the motherboard is turned on, a control terminal of the power load is coupled to a disabling voltage, and the power load is normally turned off; and If the channel of the enable switch of the control circuit of the main board is cut off, the voltage of the control terminal of the power load is determined by the voltage output by the comparator, so as to set the power load to be turned on or off. 15. A power management method for a motherboard, applied to a computer system, characterized in that the power management method includes the following steps: using a power supply to provide a supply voltage source to a power load of the motherboard; Start the computer system to execute a boot program code, and send a boot signal to a control unit of the motherboard; A power-on state output pin of the control component outputs a first output voltage to the power load according to the power-on signal, so as to turn on the power load and increase the output load of the supply voltage source; and When the computer system completes the boot program code, the boot state output pin of the control component outputs a second output voltage to the power load to turn off the power load. 16. The power management method according to claim 15, wherein the first output voltage and the second output voltage are converted to a predetermined voltage level by a voltage level conversion circuit, and then output to the power load.