CN101303616B - Computer, power supply system applied to computer and power supply method of power supply system - Google Patents

Abstract

The invention provides a power supply system applied to a computer and a power supply method thereof. The power supply method is applied to a first power supply and a second power supply for providing a first voltage to a mainboard and comprises the following steps: detecting whether the first voltage of the first power supply and the first voltage of the second power supply reach a steady state; when the first voltage of the first power supply reaches a steady state, connecting the first voltage of the first power supply to a first pin; when the first voltage of the second power supply reaches a steady state, connecting the first voltage of the second power supply to the first pin; and providing the first voltage to the mainboard by using the pin. By the power adapter board with the time sequence control function in the parallel double-group power supply system, as long as one of the two groups of power supplies can be started normally and establish the voltage required by the mainboard, the power supplies can supply power to the mainboard.

Description

Computer, power supply system applied thereon and power supply method thereof

technical field

The invention relates to a power supply system of a computer, in particular to a power supply system and a power supply method applied to a parallel dual-group power supply for a computer.

Background technique

In order to provide the working power required by the computer's internal circuit components, the motherboard in the computer is connected to a power supply (Power Supply), and the power supply can convert AC power into DC and provide it to the computer's motherboard and its peripheral devices. Please refer to FIG. 1 , which shows a schematic diagram of a known power supply system supplying power to a computer motherboard (Motherboard). The system mainly includes:

A power supply 80 and a motherboard 90 . As shown in Figure 1, the power supply 80 has a group of pins, and the group of pins includes a 24-pin (24pin), a 4-pin (4pin), a graphics card pin (VGA pin), and a hard disk pin. Pin (HD pin). The above-mentioned pins are individually connected to a 24-pin plug (24pin plug) 82, a 4-pin plug (4pin plug) 84, a graphics card plug (VGA plug) 86, and a hard disk plug (HD plug) 88 through transmission lines. . And corresponding 24-pin socket (24pinjack) 92, a 4-pin socket (4pin jack) 94, a graphics card socket (VGA jack) 96, and a hard disk socket (HD jack) 98 are also arranged on the motherboard 90.

Therefore, when the plug of the power supply 80 and the socket of the motherboard 90 are connected to each other, the power supply 80 can provide voltages of different levels such as +3V, +5V, +5VSB (+5V Stand-By-Power), +12V, etc. The voltage is supplied to the motherboard 90 , so that the power supply 80 supplies power to different components on the motherboard 90 with different levels of voltage. Wherein, +5VSB is a standby power supply, that is, when the computer is turned off, the power supply 80 can provide a DC voltage of +5VSB to the motherboard 90 .

Generally, users will not turn off the AC switch of the power supply after the computer system is shut down, so the power supply will continue to provide standby power for the motherboard, such as +5VSB. In the long run, due to the different use time of the standby power circuit and other circuits in the power supply, the related circuits of the standby power in the power supply will be easily damaged. That is to say, when other circuits in the power supply can still be used, the circuit of the standby power supply has been damaged. Therefore, the user must replace the power supply with a new one.

Contents of the invention

The present invention proposes a power supply method for a power supply system, which is applied to a first power supply and a second power supply to provide a first voltage to a motherboard, including the following steps: detecting the first power supply Whether the first voltage of the first power supply and the first voltage of the second power supply reach a steady state; when the first voltage of the first power supply reaches a steady state, connect the first voltage of the first power supply to a first lead pin; when the first voltage of the second power supply reaches a steady state, connect the first voltage of the second power supply to the first pin; and use the first pin to provide the first voltage to the motherboard.

Moreover, the present invention proposes a parallel power supply system, comprising: a first power supply with a first voltage output terminal; a second power supply with a second voltage output terminal; a first An input end of the switch circuit is connected to the first voltage output end; an input end of a second switch circuit is connected to the second voltage output end; a first timing control circuit has a first end receiving the first power supply A power good signal output by the device, a second terminal is connected to a first enabling terminal of the first switch circuit; a second timing control circuit has a third terminal receiving a power good signal output by the second power supply signal, a fourth end connected to a second enabling end of the second switch circuit; and, a plug having a first pin connected to an output end of the first switch circuit and an output of the second switch circuit at the same time terminal; wherein, the first voltage output terminal and the second voltage output terminal output the same voltage; wherein, the above-mentioned first timing control circuit outputs a first enable signal according to the above-mentioned power good signal output by the above-mentioned first power supply to enable the above-mentioned The first switch circuit, the first switch circuit receives the voltage output by the first voltage output terminal and outputs the voltage to the first pin; wherein, the second timing control circuit is based on the output of the second power supply The power good signal outputs a second enable signal to enable the second switch circuit, and the second switch circuit receives the voltage output from the second voltage output terminal and outputs the voltage to the first pin.

The present invention also proposes a computer with a parallel power supply system, including: a first power supply with a first voltage output terminal; a second power supply with a second voltage output terminal; wherein, The first voltage output end and the second voltage output end output the same voltage; an input end of a first switch circuit is connected to the first voltage output end; an input end of a second switch circuit is connected to the second voltage output end ; An input end of a third switch circuit receives a power good signal output by the first power supply; an input end of a fourth switch circuit receives a power good signal output by the second power supply; The timing control circuit has a first end for receiving the power good signal output by the first power supply, a second end connected to an enable end of the first switch circuit and an enable end of the third switch circuit; a second The timing control circuit has a third end for receiving the power good signal output by the second power supply, a fourth end connected to an enable end of the second switch circuit and an enable end of the fourth switch circuit; A plug with a first pin connected to an output end of the first switch circuit and an output end of the second switch circuit at the same time; a logic gate with two input ends connected to an output end of the third switch circuit and an output end of the second switch circuit An output end of the four-switch circuit, and has an output end connected to a second pin of the plug; The pin receives a power good signal of a power supply; wherein, the first timing control circuit outputs a first enable signal to enable the first switch circuit and the third switch according to the power good signal output by the first power supply circuit, the above-mentioned first switch circuit receives the voltage output from the above-mentioned first voltage output terminal and outputs the above-mentioned voltage to the above-mentioned first pin, and the above-mentioned third switch circuit outputs the power good signal output by the above-mentioned first power supply to the above-mentioned One of the two input terminals of the logic gate; wherein, the second timing control circuit outputs a second enabling signal to enable the second switching circuit and the fourth switching circuit according to the power good signal output by the second power supply. A switch circuit, the second switch circuit receives the voltage output from the second voltage output terminal and outputs the voltage to the first pin, and the fourth switch circuit outputs the power good signal output by the second power supply to The other of the two input terminals of the logic gate; wherein, the logic gate outputs the power good signal to the second pin.

Through the power adapter board with timing control function in the parallel dual-group power supply system of the present invention, as long as one of the two groups of power supplies can start normally and establish the voltage required by the motherboard, the group of power supplies will be Can supply power to the motherboard.

Description of drawings

FIG. 1 is a schematic diagram of a known power supply system supplying power to a computer motherboard.

FIG. 2 is a schematic diagram of the application of the parallel dual power supply system of the present invention to a motherboard.

FIG. 3 is a schematic block diagram of a power adapter board in the parallel dual power supply system of the present invention.

Fig. 4 is a schematic diagram of the switching circuit of the present invention.

Fig. 5 is an actual circuit diagram of the switching circuit of the present invention.

FIG. 6 is a schematic diagram of the timing control circuit of the present invention.

FIG. 7 is a schematic diagram of the working sequence of the power supply with timing control function according to the present invention.

Detailed ways

Please refer to FIG. 2 , which is a schematic diagram of the application of the parallel dual power supply system of the present invention to a motherboard. The power supply system mainly includes: a power supply A, a power supply B and a power adapter board 140 (Power Translate Board), and the power supply system is connected with a main board 142 . As shown, power supply A has its own set of pins (24 pin A, 4 pin A, VGA pin A, HD pin A); power supply B also has its own set of pins (24 Pin B, 4 Pin B, VGA Pin B, HD Pin B).

Furthermore, a set of pins of the power supply A is connected to a first switchset 158 and a set of pins of the power supply B is connected to a second switchset 168. Furthermore, The first switch group 158 and the second switch group 168 are connected to each other to achieve the output voltage of the power supply A and the power supply B in parallel. Furthermore, the 24-pin, 4-pin, VGA pin and HD pin connected in parallel are respectively connected to a 24-pin plug 82 , a 4-pin plug 84 , a VGA plug 86 and a HD plug 88 . The motherboard 142 also has a 24-pin socket 92 , a 4-pin socket 94 , a graphics card socket 96 and a hard disk socket 98 that are connected correspondingly.

Firstly, when the motherboard 142 is not started, the power supplies A and B are in the standby state (Stand-By). At this time, the power supplies A and B only provide the basic standby power of the motherboard, such as +5VSB. When the switch of the motherboard is pressed down, the power supplies A and B start up immediately. At this time, the power supplies A and B will establish voltages of different levels (+3V, +5V, +12V) required by the motherboard 142 . The voltages of different levels generated by the power supply A will first be output by its own set of pins. Similarly, voltages of different levels generated by the power supply B will first be output from one of its own pins.

According to the embodiment of the present invention, when the voltages of different levels generated by one of the power supply A or the power supply B reach a steady state, the first switch group 158 or the second switch group 168 can act and switch the different voltage levels to a steady state. The flat voltage is transmitted to the motherboard 142 through the power adapter board 140 . Furthermore, since the power supplies A and B are connected in parallel, when only one of the voltages of the power supplies A and B reaches a steady state, the motherboard 142 can receive the output voltage of the power adapter board 140, and then complete the power supply. The supply A or B supplies power to the motherboard 142 .

Please refer to FIG. 3 , which shows a detailed block diagram of the power adapter board of the present invention. It can be seen from the figure that the 24-pin C, 4-pin C, VGA pin C, and HD pin C of the power adapter board 140 can be connected to the 24-pin A, 4-pin A, and VGA pins of the power supply A correspondingly. Pin A, HD pin A; and 24 pins D, 4 pins D, VGA pin D, HD pin D of power adapter board 140 can be connected to 24 pins B, 4 pins of power supply B correspondingly Pin B, VGA pin B, HD pin B. Furthermore, the first switch group includes seven switch circuits SW-A1, SW-A2, SW-A3, SW-A4, SW-A5, SW-A6, SW-A7, while the second switch group includes seven switch circuits SW-B1, SW-B2, SW-B3, SW-B4, SW-B5, SW-B6, SW-B7.

Wherein, the +3V output terminal of the 24-pin C is connected to the 24-pin plug 82 via the switch circuit A1 (SW-A1), and the +5V output terminal is connected to the 24-pin plug 82 via the switch circuit A2 (SW-A2), The +12V output terminal is connected to the 24-pin plug 82 via the switch circuit A3 (SW-A3); the +12V output terminal in the 4-pin C is connected to the 4-pin plug 84 via the switch circuit A5 (SW-A5); the VGA pin The +12V output in pin C is connected to the VGA pin plug 86 via switch circuit A6 (SW-A6); and the +12V output in HD pin C is connected to the HD pin via switch circuit A7 (SW-A7) Plug 88.

Similarly, the +3V output terminal of the 24-pin D is connected to the 24-pin plug 82 via the switch circuit B1 (SW-B1), and the +5V output terminal is connected to the 24-pin plug 82 via the switch circuit B2 (SW-B2). , the +12V output terminal is connected to the 24-pin plug 82 via the switch circuit B3 (SW-B3); the +12V output terminal in the 4-pin D is connected to the 4-pin plug 84 via the switch circuit B5 (SW-B5); VGA The +12V output in pin D is connected to VGA pin header 86 via switch circuit B6 (SW-B6); and the +12V output in HD pin D is connected to HD pin 86 via switch circuit B7 (SW-B7). pin plug 88. Furthermore, in order to provide +5VSB to the motherboard in the standby state, the +5VSB output terminal in the 24-pin C is connected to the 24-pin plug 82 through a first diode D1; and the +5VSB output in the 24-pin D The 5VSB output is connected to the 24-pin header 82 via a second diode D2.

Moreover, when the user presses the power button of the computer, the motherboard can generate a power switch on signal PSON (power switch on signal), which is transmitted to the 24-pin socket 92 of the motherboard 140 in FIG. Plug 82. The power adapter board 140 transmits the start signal PSON to the 24-pin A of the power supply A and the 24-pin B of the power supply B through the 24-pin C and the 24-pin D respectively, so that the power supply A and the power supply The provider B can be started according to the start signal PSON.

When power supply A and power supply B start up, it means that all output voltages of power supply A and power supply B have reached a steady state. At this time, the power supply A and the power supply B respectively output a power good signal PG (power good signal). That is to say, when the power supply A reaches the steady state, it will output the power supply A good signal PG-A, and when the power supply B reaches the steady state, it will output the power supply B good signal PG-B, which is used to notify the mainboard power supply A and All output voltages of power supply B have reached steady state.

According to an embodiment of the present invention, the power supply A good signal PG-A and the power supply B good signal PG-B are connected to an input terminal of an OR gate (OR gate) 162, and the output terminal of the OR gate 162 is connected to a 24-pin plug One of the 82 pins. That is to say, when any power supply reaches a steady state, the output terminal of the OR gate 162 can generate the power good signal PG and transmit it to the motherboard. Therefore, the motherboard can know that the voltage of the power supply system (including the power supply A and the power supply B) has reached a steady state according to the power good signal PG. Of course, the present invention can also change the OR gate 162 into an AND gate. Therefore, when all the power supplies have reached a steady state, the output terminal of the AND gate can generate the power good signal PG and transmit it to the motherboard.

According to an embodiment of the present invention, a timing control circuit is also provided on the power adapter board 140, so that the switching circuit on the power adapter board 140 can operate according to the action of the timing control circuit. For example, the power adapter board 140 includes a first timing control circuit 810 and a second timing control circuit 820 . Wherein, the first timing control circuit 810 receives the power good signal PG-A of the power supply A, and outputs the first enable signal En-A to the first switches SW-A1, SW-A2, SW-A3, SW -A4, SW-A5, SW-A6, SW-A7; similarly, the second timing control circuit 820 receives the power good signal PG-B of the power supply B, and outputs the second enabling signal En-B to the second Switch groups SW-B1, SW-B2, SW-B3, SW-B4, SW-B5, SW-B6, SW-B7.

When the user presses the power button of the computer, the motherboard generates the start signal PSON, and after the power supply A and B start to build up the voltage, all the switch circuits have not received the first enable signal En-A or the second enable signal Signal En-B, so all switching circuits cannot operate.

Until the power good signal PG-A of the power supply A is generated, the first timing control circuit 810 outputs the first enable signal En-A, and all the switch circuits in the first switch group can be enabled (enable) And action. Similarly, when the power good signal PG-B of the power supply B is generated and the second timing control circuit 820 outputs the second enable signal En-B, all the switch circuits in the second switch group can be activated. able to act.

After all the switch circuits are enabled, the detection circuit in the switch circuit can continue to detect that the voltage of the input terminal Si of the switch is greater than the voltage of the output terminal So, and achieve the connection of all switch circuits; and, the motherboard is the receiving power adapter board output voltage.

Furthermore, please refer to FIG. 4 , which is a schematic diagram of the switching circuit of the present invention. According to the embodiment of the present invention, all switch circuit configurations are the same. The switch circuit includes: a switch 200 and a detection circuit 210 . Wherein, an input terminal Si and an output terminal So of the switch 200 can be connected or not connected to the output terminal So through the control signal C output by the detection circuit 210 . The detection circuit has two detection terminals ( D1 , D2 ) respectively connected to the input terminal Si and the output terminal So of the switch 200 , and the detection circuit 210 also includes an enable terminal for receiving the first enabling signal or the second enabling signal. When the detection circuit 210 receives the first enabling signal or the second enabling signal, it can be enabled and start to operate. Therefore, when the voltage of the first detection terminal D1 is greater than the voltage of the second detection terminal D2, the control signal C controls the switch to achieve connection; otherwise, when the voltage of the first detection terminal D1 is not greater than the voltage of the second detection terminal D2, Then the control signal C controls the switch to achieve non-connection. Furthermore, the input terminals Si of the switches are connected to the corresponding pins of the power supply side A or the power supply side (power supply side), and the output terminals So of the switches are connected to the phase pins of the plug side (plug side). Corresponding pin.

Please refer to FIG. 5 , which shows the actual circuit diagram of the switching circuit of the present invention. The switch 200 includes two transistors (MOSFET) back-to-back connection configuration, that is, the bodies of the two transistors are connected. In this way, the diode (Body Diode) generated inside the transistor itself can block the power supply from both sides. Power supply A or B is leaked from power supply A or B to the mainboard or from the mainboard side to ensure that the power flow is consistent and output to the mainboard side when it is working normally, and it will not be caused by a certain group of power supplies. When off, there is still a path for excess current to flow into the power supply. Moreover, in order to ensure that the detection circuit 210 can control the switch smoothly, the control signal is +24V. In order to reach +24V, the detection circuit 210 also includes a booster circuit (voltage booster) that can boost the +5V standby power supply (+5VSB) to +24V (+24VSB), so that the detection circuit 210 can selectively increase the + 24V output to switch 200 . Furthermore, since the boost circuit has already been applied to many known control circuits, the present invention will not be described in detail. Furthermore, the first enable signal En-A or the second enable signal En-B output by the timing control circuit can enable the detection circuit in the switch circuit, or the voltage booster in the detection circuit.

In order to specifically explain the working principle of the switch in the power adapter board, the +5V voltage provided by the power supply is controlled by the switch circuit and finally transmitted to the motherboard for illustration. When the switch circuit is enabled and starts to operate, it can be seen from FIG. 5 that the +5V voltage that the power supply side can provide is to the input terminal Si of the switch 200 , and the output terminal So of the switch 200 is connected to the 24-pin plug 82 side.

Since the two detection terminals D1 and D2 of the detection circuit are respectively connected to the input terminal Si and the output terminal So of the switch 200 . When the voltage of the first detection terminal D1 is greater than the voltage of the second detection terminal D2, the control signal C is +24V and the control switch 200 is connected so that the +5V voltage can be output from the power supply side to the 24-pin socket 82 side; otherwise , when the voltage of the first detection terminal D1 is not greater than the voltage of the second detection terminal D2, the control signal C is not +24V and the control switch 200 is not connected so that the +5V voltage cannot be output from the power supply side to the 24 pin Plug 82 side.

Please refer to FIG. 6 , which is a schematic diagram of the first timing control circuit of the present invention. The first timing control circuit mainly includes: a BJT switch 970; wherein the base (base) of the BJT switch 970 is connected to the power supply A good signal PG-A output by the power supply A through a resistor R1; the collector of the BJT switch 970 (collector) is connected to the +5VSB output by the power supply A; the emitter of the BJT switch 970 is grounded through a resistor R2, and the emitter can output the first enabling signal En-A to connect the enabling of all switching circuits terminal (En), such as the enable terminal of the switch circuit (SW-A4).

Taking FIG. 6 as an example, when the power supply A good signal PG-A output by the power supply A is at a high level, the BJT switch 970 is turned on (turn on), and the first enabling signal En-A outputs a high level. Therefore, The switch circuit (SW-A4) can operate normally and make the output terminal of the switch circuit (SW-A4) output the intact signal PG-A. Similarly, all switching circuits have the same operating principle. Furthermore, the present invention does not limit the circuit structure of the timing control circuit, and those skilled in the art can also use a buffer circuit to replace the timing control circuit of FIG. 6 .

That is to say, when the user presses the power button of the computer, the motherboard generates the activation signal PSON to activate the power supply A and the power supply B. During the start-up process of the power supply A and the power supply B, the voltages of all voltage output terminals (+3V, +5V, +12V) start to rise. Furthermore, during the voltage rising process, all the switch circuits have not received the first enable signal or the second enable signal, therefore, all the switch circuits cannot operate. When all voltage output terminals (+3V, +5V, +12V) of the power supply A have reached a steady state and output the power supply A good signal PG-A, the first switch circuit group SW-A1, SW-A2, SW- A3, SW-A4, SW-A5, SW-A6, and SW-A7 are enabled to operate; similarly, when all voltage output terminals (+3V, +5V, +12V) of power supply B have reached a steady state And when the power supply B good signal PG-B is output, the second switch group SW-B1, SW-B2, SW-B3, SW-B4, SW-B5, SW-B6, SW-B7 are enabled and act.

Furthermore, assume that the +5V output terminal of the power supply A in the power supply system fails to output +5V normally, for example, it can only output 1.5V. Obviously, the voltage on side A of the power supply (1.5V) is lower than that on the 82 side of the 24-pin plug (5V). At this time, the switch circuit SW-A1 is disconnected and makes the side A of the power supply unable to supply voltage to the motherboard. . At this time, only the +5V output terminal of the power supply B can output the voltage to the motherboard through the switch circuit SW-B1. Similarly, other voltage terminals also use the same principle to operate, so no more details are given here.

Please refer to FIG. 7 , which is a schematic diagram of the working sequence of the power supply with timing control function of the present invention (power supply A). When the user has not pressed the power button of the computer, the power supply remains in the standby state, as in step 952 . At this time, the power supply provides +5VSB to the main board, and the boost circuit in the detection circuit raises +5VSB to +24V, as in step 954. At this time, the switch circuit is not yet enabled and cannot operate.

When the user has not pressed the power button of the computer, the motherboard does not generate the start signal PSON, as in step 956 , and therefore, returns to step 954 . On the contrary, when the user presses the power button of the computer, the motherboard generates the start signal PSON, as in step 956 . At this point, the power supply starts to build up voltage, that is, the voltages of all voltage output terminals (+3V, +5V, +12V) of the power supply start to rise, as in step 958 .

Next, when the power supply has output voltages (+3V, +5V, +12V) stably, it can output the power good signal PG-A, as in step 960 . Next, according to the power good signal PG-A, the first timing control circuit 810 outputs a first enable signal En-A to enable the switch circuit to operate normally to achieve the connection of the switch circuit, such as step 962 . Finally, the motherboard can receive the power good signal PG, and receive the output voltage of the power adapter board, as in step 964 .

As can be seen from the above embodiments, through the power adapter board with timing control function in the parallel dual-group power supply system of the present invention, as long as one of the two groups of power supplies can start normally and establish the voltage required by the motherboard, This group of power supplies can supply power to the motherboard; in addition, through the back-to-back connection configuration of the transistors (PQ1, PQ2) in the switch, it can also ensure that when the power supply supplies power to the motherboard, the power flow is consistent and output to the host board terminal without leakage current; in addition, through the detection circuit in the switch to control the connection or non-connection of the switch, even if one of the power supplies is suddenly damaged, it can still output normal voltage to the main board; in addition, through the sequence The control circuit will ensure that the voltage received by the motherboard is +3V, +5V, +12V in a steady state.

In summary, although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention, any person familiar with this technology, without departing from the spirit and scope of the present invention, should be able to Various changes and modifications are made, so the scope of protection of the present invention should be based on the scope of protection defined in the claims.

Claims (18)

1. A power supply method for a power supply system, which is applied to a first power supply and a second power supply to provide a first voltage to a motherboard, wherein the power supply method includes the following steps: Detecting whether the first voltage of the first power supply and the first voltage of the second power supply reach a steady state; When the first voltage of the first power supply reaches the steady state, connecting the first voltage of the first power supply to the first pin; connecting the first voltage of the second power supply to the first pin when the first voltage of the second power supply reaches the steady state; and The first voltage is provided to the motherboard by using the first pin. 2. The power supply method according to claim 1, wherein the first power good signal output by the first power supply and the second power good signal output by the second power supply are used to detect the Whether the first voltage reaches the above steady state. 3. The power supply method according to claim 1, wherein when the first voltage of the first power supply reaches the steady state, the first switch circuit is used to switch the first voltage of the first power supply to the first voltage is connected to the first pin; and When the first voltage of the second power supply reaches the steady state, a second switch circuit is used to connect the first voltage of the second power supply to the first pin. 4 . The power supply method according to claim 1 , wherein the first power supply and the second power supply can also receive a start signal to start building the first voltage. 5. The power supply method according to claim 1, wherein the first voltage is +3V, +5V or +12V. 6. A parallel power supply system, characterized in that it comprises: The first power supply has a first voltage output terminal; The second power supply has a second voltage output terminal; A first switch circuit, the input end of the first switch circuit is connected to the first voltage output end; a second switch circuit, the input end of the second switch circuit is connected to the second voltage output end; The first timing control circuit has a first end receiving the power good signal output by the first power supply, and a second end connected to the first enabling end of the first switch circuit; The second timing control circuit has a third end receiving the power good signal output by the second power supply, and a fourth end connected to the second enabling end of the second switch circuit; and A plug having a first pin connected to the output end of the first switch circuit and the output end of the second switch circuit at the same time; Wherein, the above-mentioned first voltage output terminal and the above-mentioned second voltage output terminal output the same voltage; Wherein, the first timing control circuit outputs a first enable signal to enable the first switch circuit according to the power good signal output by the first power supply, and the first switch circuit receives the voltage output from the first voltage output terminal And output the above voltage to the above first pin; Wherein, the second timing control circuit outputs a second enable signal to enable the second switch circuit according to the power good signal output by the second power supply, and the second switch circuit receives the voltage output from the second voltage output terminal And output the above-mentioned voltage to the above-mentioned first pin. 7. The power supply system according to claim 6, wherein the plug further includes a second pin for receiving a startup signal generated by the motherboard, and the plug transmits the startup signal to the first power supply device and the above-mentioned second power supply. 8. The power supply system according to claim 6, wherein the power supply system further comprises a third switch circuit, a fourth switch circuit, and an AND logic gate, wherein the logic gate has two input terminals respectively connected to the The output end of the third switch circuit and the output end of the above-mentioned fourth switch circuit, the above-mentioned logic gate has an input end connected to the third pin of the above-mentioned plug, the input end of the above-mentioned third switch circuit and the input end of the above-mentioned fourth switch circuit are respectively Connect to the first power supply and the above-mentioned second power supply. 9. The power supply system according to claim 8, wherein the first switch circuit, the second switch circuit, the first timing control circuit, the second timing control circuit, the third switch circuit . The above-mentioned fourth switch circuit and the above-mentioned logic gate are arranged on the power adapter board. 10. The power supply system according to claim 8, wherein the enabling terminal of the third switch circuit is connected to the first timing control circuit, so that the first timing control circuit can The above-mentioned power good signal outputted by the supplier enables the above-mentioned third switch circuit; and The enable end of the fourth switch circuit is connected to the second timing control circuit, so that the second timing control circuit can enable the fourth switch circuit according to the power good signal output by the second power supply. 11. The power supply system according to claim 6, wherein the first voltage output terminal can output a voltage of +3V, +5V or +12V. 12. The power supply system according to claim 6, wherein the socket can be a 24-pin socket, a 4-pin socket, a graphics card pin socket or a hard disk pin socket. 13. The power supply system according to claim 6, wherein the first switch circuit comprises: a switch having the input end of the first switch circuit, the output end and a control end of the first switch circuit; and The detection circuit has a first detection terminal connected to the above-mentioned input terminal of the above-mentioned first switch circuit, and a second detection terminal connected to the above-mentioned input terminal of the above-mentioned first switch circuit, and outputs a control signal to the above-mentioned control terminal; Wherein, when the voltage of the first detection terminal is greater than the voltage of the second detection terminal, the control signal controls the switch to achieve connection; when the voltage of the first detection terminal is not greater than the voltage of the second detection terminal, the control signal controls the switch No connection is achieved; and the detection circuit is enabled by the power good signal output by the first power supply. 14. The power supply system according to claim 13, wherein the voltage of the control signal is greater than the voltage of the first voltage output terminal. 15. A computer with a parallel power supply system, characterized in that it comprises: The first power supply has a first voltage output terminal; The second power supply has a second voltage output terminal; wherein, the first voltage output terminal and the second voltage output terminal output the same voltage; A first switch circuit, the input end of the first switch circuit is connected to the first voltage output end; a second switch circuit, the input end of the second switch circuit is connected to the second voltage output end; a third switch circuit, the input terminal of the third switch circuit receives the power good signal output by the first power supply; A fourth switch circuit, the input terminal of the fourth switch circuit receives the power good signal output by the second power supply; The first timing control circuit has a first end receiving the power good signal output by the first power supply, and a second end connected to the enable end of the first switch circuit and the enable end of the third switch circuit; The second timing control circuit has a third terminal for receiving the power good signal output by the second power supply, and a fourth terminal connected to the enable terminal of the second switch circuit and the enable terminal of the fourth switch circuit; A plug having a first pin connected to the output end of the first switch circuit and the output end of the second switch circuit at the same time; a logic gate having two input terminals connected to the output terminal of the third switch circuit and the output terminal of the fourth switch circuit, and having an output terminal connected to the second pin of the plug; and The motherboard has a socket for combining with the plug, receiving the voltage through the first pin and receiving the power supply good signal of the power supply through the second pin; Wherein, the first timing control circuit outputs a first enable signal to enable the first switch circuit and the third switch circuit according to the power good signal output by the first power supply, and the first switch circuit receives the first the voltage output by the voltage output terminal and output the above voltage to the above first pin, and the above third switch circuit outputs the power good signal output by the above first power supply to one of the above two input terminals of the above logic gate ; Wherein, the second timing control circuit outputs a second enable signal to enable the second switch circuit and the fourth switch circuit according to the power good signal output by the second power supply, and the second switch circuit receives the second the voltage output by the voltage output terminal and output the above voltage to the above first pin, and the above fourth switch circuit outputs the power good signal output by the above second power supply to the other of the above two input terminals of the above logic gate one; Wherein, the logic gate outputs the power good signal to the second pin. 16. The computer of the parallel power supply system according to claim 15, wherein the plug further includes a third pin for receiving the startup signal generated by the motherboard, and the plug transmits the startup signal to The above-mentioned first power supply and the above-mentioned second power supply. 17. The computer of the parallel power supply system according to claim 15, wherein the first switch circuit, the second switch circuit, the first timing control circuit, the second timing control circuit, the The third switch circuit, the fourth switch circuit and the logic gate are arranged on the power adapter board. 18. The computer of a parallel power supply system according to claim 15, wherein said voltage is +3V, +5V or +12V. 19. The computer of the parallel power supply system according to claim 15, wherein said first switch circuit comprises: a switch having the input end of the first switch circuit, the output end and a control end of the first switch circuit; and The detection circuit has a first detection terminal connected to the above-mentioned input terminal of the above-mentioned first switch circuit, and a second detection terminal connected to the above-mentioned input terminal of the above-mentioned first switch circuit, and outputs a control signal to the above-mentioned control terminal; Wherein, when the voltage of the first detection terminal is greater than the voltage of the second detection terminal, the control signal controls the switch to achieve connection; when the voltage of the first detection terminal is not greater than the voltage of the second detection terminal, the control signal controls the switch No connection is achieved; and the detection circuit is enabled by the power good signal output by the first power supply. 20. The computer of the parallel power supply system according to claim 19, wherein the voltage of the control signal is greater than the voltage of the first voltage output terminal.

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