TW202601335A - Power control system and operation method thereof - Google Patents

Abstract

The present disclosure is related to a power control system and an operation method thereof. The power control system comprises a power input unit, a power output unit and a switch unit. The power input unit has a first voltage output terminal, a second voltage output terminal and a first neutral line terminal. The power output unit has a live wire terminal and a second neutral line terminal. The live wire terminal is electrically connected to the first voltage output terminal of the power input unit. In an operating mode, the switch unit switches to conduct the second neutral line terminal to the second voltage output terminal of the power input unit, and the power output unit outputs a first output power to supply power to an electronic device. In a power saving mode, the switch unit switches to conduct the second neutral line terminal to the first neutral line terminal, and the power output unit outputs a second output power to supply power to the electronic device.

Description

Power control system and its operation method

This application relates to a power supply system, and more particularly to a power supply control system with a power saving mechanism and its operation method.

Generally speaking, a power system (such as a power distribution device) can be a power distribution system used to distribute AC power (such as single-phase or three-phase AC power) from the mains or uninterruptible power supply system to one or more devices. Environments with a large number of devices, such as data centers and server rooms, especially require power systems to assist in power distribution.

The aforementioned devices are not always in an active state. When a device is in a non-active state, such as sleep or standby mode, its power consumption is much lower than when it is operating. Therefore, the power required by a device in a non-active state is far less than that required when it is operating. However, conventional power systems continue to supply power to the device even when it is not in an active state, resulting in wasted power consumption by the power system.

Therefore, how to propose a power control system with a power-saving mechanism and its operation method is one of the problems that urgently need to be solved in this technical field.

To solve the above-mentioned technical problems, this application proposes a power control system and its operation method, which can change the output power according to the operation mode of the electronic device to achieve the purpose of saving power.

To achieve the above objectives, this application proposes a power control system for supplying power to an electronic device, which can operate in a working mode and a power-saving mode. The power control system includes a power input unit, a power output unit, and a switching unit. The power input unit receives an AC power supply and has a first voltage output terminal, a second voltage output terminal, and a first neutral terminal. The power output unit has a live wire terminal and a second neutral wire terminal, the live wire terminal being electrically connected to the first voltage output terminal of the power input unit. The switching unit is electrically connected between the power input unit and the power output unit. In the operating mode, the switching unit switches to connect the second neutral line terminal to the second voltage output terminal of the power input unit, and the power output unit outputs a first output power to supply power to the electronic device. In the power saving mode, the switching unit switches to connect the second neutral line terminal to the first neutral line terminal, and the power output unit outputs a second output power to supply power to the electronic device.

To achieve the above objectives, this application proposes a method for operating a power control system. The power control system supplies power to an electronic device. The electronic device can operate in a working mode and a power-saving mode. The power control system includes a power input unit, a switching unit, and a power output unit. The power input unit receives an AC power supply and has a first voltage output terminal, a second voltage output terminal, and a first neutral terminal. The power output unit has a live wire terminal and a second neutral wire terminal. The first voltage output terminal of the power input unit is electrically connected to the live wire terminal of the power output unit. The operation method of the power control system includes: in the working mode, switching the switching unit so that the second neutral line terminal of the power output unit is connected to the second voltage output terminal of the power input unit, and the power output unit outputs a first output power to supply power to the electronic device; in the power saving mode, switching the switching unit so that the second neutral line terminal of the power output unit is connected to the first neutral line terminal of the power input unit, and the power output unit outputs a second output power to supply power to the electronic device.

Based on the above, the power control system proposed in this application can switch the switching unit when the electronic device is in power-saving mode, so that the second neutral terminal of the power output unit is connected to the first neutral terminal of the power input unit, so as to supply a second output power with a lower output voltage to the electronic device. Therefore, when the electronic device is in power-saving mode, the power control system of this application can output a lower output power, thus achieving lower power consumption and saving power.

Please refer to Figure 1, which is a schematic diagram of an embodiment of the power control system of this application. The power control system 1 is electrically connected to the AC power supply 2 and the electronic device 3. The power control system 1 receives power from the AC power supply 2 and supplies power to the electronic device 3 according to its needs. The electronic device 3 can selectively operate in a working mode and a power-saving mode. The power-saving mode includes non-working modes such as low power consumption mode, sleep mode, or hibernation mode.

The power control system 1 includes a power output module 100, a processor module 200, and a status acquisition module 300. The power output module 100 is electrically connected to the processor module 200, and the processor module 200 is electrically connected to the status acquisition module 300.

The status acquisition module 300 is used to obtain status signals related to the electronic device 3 and provide the status signals to the processor module 200.

The processor module 200 confirms whether the electronic device 3 is operating in working mode or power-saving mode based on the status signal, and the processor module 200 generates corresponding control signals C1, C2 and/or C3 based on the determination of the operating mode of the electronic device 3.

In one embodiment, the processor module 200 may be implemented with one or more processor units. A processor unit may be, for example, a microprocessor circuit, and this application is not limited thereto.

The power output module 100 outputs a first output power supply V1 or a second output power supply V2 to the electronic device 3 based on the received control signals C1, C2, and/or C3. The first output power supply V1 is the operating voltage of the electronic device 3 when operating in working mode, and the second output power supply V2 is the power-saving voltage of the electronic device 3 when operating in power-saving mode. The voltage of the first output power supply V1 is different from that of the second output power supply V2. The voltage of the first output power supply V1 is higher than that of the second output power supply V2. In some embodiments, the processor module 200 and the status acquisition module 300 can also be integrated into the same integrated circuit, as long as it can receive status signals and send corresponding control signals to the power output module 100, it is within the protection scope of this invention.

Therefore, the power control system of this application can provide a corresponding output power (first output power V1 or second output power V2) to the electronic device 3 according to the operating mode (working mode or power saving mode) of the electronic device 3.

Please refer to Figures 1, 2, and 3 simultaneously. Figure 2 is a schematic diagram of an embodiment of the power output module 100 operating in the working mode. Figure 3 is a schematic diagram of an embodiment of the power output module 100 operating in the power saving mode. The power output module 100 includes a power input unit 110, a switching unit 120, and a power output unit 130. The switching unit 120 is electrically connected to the power input unit 110 and the power output unit 130, and the switching unit 120 is electrically connected between the power input unit 110 and the power output unit 130.

The power input unit 110 has a first voltage output terminal 111, a second voltage output terminal 112, and a first neutral terminal N1. The power input unit 110 is used to receive power from the AC power supply 2. In one embodiment, the power input unit 110 is, for example, a power plug of the power control system 1.

In one embodiment, the AC power supply 2 is a three-phase AC power supply, which has an R-phase terminal, a S-phase terminal, a T-phase terminal, and a neutral terminal. The first voltage output terminal 111 of the power input unit 110 is electrically connected to one of the R-phase, S-phase, and T-phase terminals. The second voltage output terminal 112 of the power input unit 110 is electrically connected to the other of the R-phase, S-phase, and T-phase terminals. The first voltage output terminal 111 and the second voltage output terminal 112 are electrically connected to different phase terminals. The first neutral terminal N1 of the power input unit 110 is electrically connected to the neutral terminal of the three-phase AC power supply. In one embodiment, the voltage value of the first neutral terminal N1 is 0 volts. In this embodiment, the power input unit 110 is a three-phase four-wire power input device.

In one embodiment, the AC power supply 2 is a single-phase AC power supply, which has a first live wire terminal, a second live wire terminal, and a neutral wire terminal. The first voltage output terminal 111 of the power input unit 110 is electrically connected to one of the first and second live wire terminals, and the second voltage output terminal 112 of the power input unit 110 is electrically connected to the other of the first and second live wire terminals. The first voltage output terminal 111 and the second voltage output terminal 112 are electrically connected to different live wire terminals. The first neutral wire terminal N1 of the power input unit 110 is electrically connected to the neutral wire terminal of the single-phase AC power supply. In one embodiment, the voltage value of the first neutral wire terminal N1 is 0 volts. In this embodiment, the power input unit 110 is a single-phase three-wire power input device.

The power output unit 130 has a live wire terminal L and a second neutral wire terminal N2. The live wire terminal L is electrically connected to the first voltage output terminal 111 of the power input unit. The second neutral wire terminal N2 of the power output unit 130 is electrically connected to the switching unit 120. The power output unit 130 is, for example, a power socket of the power control system 1. The electronic device 3 can be electrically connected to the power control system 1 by inserting its plug into the power socket of the power control system 1.

Switching unit 120 includes a first switching unit 121 and a second switching unit 122. The first switching unit 121 is electrically connected between the first neutral terminal N1 of the power input unit 110 and the second neutral terminal N2 of the power output unit 130. The first switching unit 121 has a first terminal T1, a second terminal T2, and a third terminal T3. The first terminal T1 of the first switching unit 121 is electrically connected to the first neutral terminal N1 of the power input unit 110. The second terminal T2 of the first switching unit 121 is electrically connected to the second neutral terminal N2 of the power output unit 130. The third terminal T3 of the first switching unit 121 is, for example, unconnected. The first switching unit 121 receives a control signal C1 and, based on the control signal C1, switches to establish an electrical connection between the first terminal T1 and the second terminal T2 or the third terminal T3 of the first switching unit 121. When the first terminal T1 of the first switching unit 121 is electrically connected to the second terminal T2, the first neutral terminal N1 of the power input unit 110 is electrically connected to the second neutral terminal N2 of the power output unit 130. When the first terminal T1 of the first switching unit 121 is electrically connected to the third terminal T3, the electrical connection between the first neutral terminal N1 of the power input unit 110 and the second neutral terminal N2 of the power output unit 130 is broken.

The second switching unit 122 is electrically connected between the second voltage output terminal 112 of the power input unit 121 and the second neutral terminal N2 of the power output unit 130. The second switching unit 121 has a first terminal T4, a second terminal T5, and a third terminal T6. The first terminal T4 of the second switching unit 122 is electrically connected to the second voltage output terminal 112 of the power input unit 110. The second terminal T5 of the second switching unit 122 is electrically connected to the second neutral terminal N2 of the power output unit 130. The third terminal T6 of the second switching unit 122 is, for example, unconnected. The second switching unit 121 receives a control signal C2 and, based on the control signal C2, switches to establish an electrical connection between the first terminal T4 and the second terminal T5 or the third terminal T6 of the second switching unit 122. When the first terminal T4 of the second switching unit 122 is electrically connected to the second terminal T5, the second voltage output terminal 112 of the power input unit 110 is electrically connected to the second neutral terminal N2 of the power output unit 130. When the first terminal T4 of the second switching unit 122 is electrically connected to the third terminal T6, the second voltage output terminal 112 of the power input unit 110 is electrically disconnected from the second neutral terminal N2 of the power output unit 130.

Referring simultaneously to Figures 2 and 11, when the processor module 200 confirms that the electronic device 3 is operating in the working mode based on the status signal, the processor module 200 generates control signals C1 and C2 corresponding to the working mode, and provides control signals C1 and C2 to the first switching unit 121 and the second switching unit 122 respectively. The first switching unit 121 switches based on control signal C1, connecting its first terminal T1 to its third terminal T3. The second switching unit 122 switches based on control signal C2, connecting its first terminal T4 to its second terminal T5. Therefore, the second neutral terminal N2 of the power output unit 130 is electrically connected to the second voltage output terminal 112 of the power input unit 110, and the power output unit 130 outputs the first output power V1. In this embodiment, since the voltage difference between the live wire terminal L and the second neutral wire terminal N2 of the power output unit 130 is the voltage difference between the first voltage output terminal 111 and the second voltage output terminal 112 of the power input unit 110, the first output power V1 is the voltage difference between the first voltage output terminal 111 and the second voltage output terminal 112 of the power input unit 110. In this embodiment, the first output power V1 is, for example, 208V, but the invention is not limited thereto.

Referring simultaneously to Figures 3 and 12, when the processor module 200 confirms that the electronic device 3 is operating in power-saving mode based on a status signal, the processor module 200 generates control signals C1 and C2 corresponding to the power-saving mode, and provides control signals C1 and C2 to the first switching unit 121 and the second switching unit 122 respectively. Based on control signal C1, the first switching unit 121 connects its first terminal T1 to its second terminal T2. Based on control signal C2, the second switching unit 122 connects its first terminal T4 to its third terminal T6. Therefore, the second neutral terminal N2 of the power output unit 130 is electrically connected to the first neutral terminal N1 of the power input unit 110, and the power output unit 130 outputs the second output power V2. In this embodiment, since the voltage difference between the live wire terminal L and the second neutral wire terminal N2 of the power output unit 130 is the same as the voltage difference between the first voltage output terminal 111 and the first neutral wire terminal N1 of the power input unit 110, the second output power V2 is the same as the voltage difference between the first voltage output terminal 111 and the first neutral wire terminal N1 of the power input unit 110. In this embodiment, the second output power V2 is, for example, 120V, but the invention is not limited thereto.

Therefore, the power output module 100 of this application can provide corresponding output power to the electronic device 3 according to control signals (e.g., control signals C1, C2). Furthermore, control signals C1 and C2 can be the same or different signals issued by the processor module 200. Those skilled in the art can design according to actual needs; therefore, whether control signals C1 and C2 are the same or different, they are all within the protection scope of this invention.

Please refer to Figures 4 and 5. Figure 4 is a schematic diagram of another embodiment of the power output module 100 operating in the working mode. Figure 5 is a schematic diagram of another embodiment of the power output module 100 operating in the power saving mode. The difference between the embodiments in Figures 4 and 5 and the embodiments in Figures 2 and 3 is that the switching unit 120 includes a third switching unit 123.

The third switching unit 123 is electrically connected between the first neutral terminal N1, the second voltage output terminal 112 of the power input unit 110, and the power output unit 130. The third switching unit 121 has a first terminal T7, a second terminal T8, and a third terminal T9. The first terminal T7 of the third switching unit 121 is electrically connected to the second neutral terminal N2 of the power output unit 130. The second terminal T8 of the third switching unit 123 is electrically connected to the first neutral terminal N1 of the power input unit 110. The third terminal T9 of the third switching unit 123 is electrically connected to the second voltage output terminal 112 of the power input unit 110. The third switching unit 123 receives the control signal C3 and switches based on the control signal C3, establishing an electrical connection between the first terminal T7 and the second terminal T8 or the third terminal T9 of the third switching unit 123. When the first terminal T7 of the third switching unit 123 is electrically connected to the second terminal T8, the first neutral terminal N1 of the power input unit 110 is electrically connected to the second neutral terminal N2 of the power output unit 130. When the first terminal T7 of the third switching unit 123 is electrically connected to the third terminal T9, the second voltage output terminal 112 of the power input unit 110 is electrically connected to the second neutral terminal N2 of the power output unit 130.

Referring simultaneously to Figures 4 and 11, when the processor module 200 confirms that the electronic device 3 is operating in the working mode based on the status signal, the processor module 200 generates a control signal C3 corresponding to the working mode and provides the control signal C3 to the third switching unit 123. The third switching unit 123 switches based on the control signal C1, connecting its first terminal T7 with its third terminal T9. Therefore, the second neutral terminal N2 of the power output unit 130 is electrically connected to the second voltage output terminal 112 of the power input unit 110, and the power output unit 130 outputs the first output power V1. In this embodiment, since the voltage difference between the live wire terminal L and the second neutral wire terminal N2 of the power output unit 130 is the voltage difference between the first voltage output terminal 111 and the second voltage output terminal 112 of the power input unit 110, the first output power V1 is the voltage difference between the first voltage output terminal 111 and the second voltage output terminal 112 of the power input unit 110. In this embodiment, the first output power V1 is, for example, 208V, but the invention is not limited thereto.

Referring to Figures 5 and 12, when the processor module 200 confirms that the electronic device 3 is operating in power-saving mode based on a status signal, the processor module 200 generates a control signal C3 corresponding to the power-saving mode and provides the control signal C3 to the third switching unit 123. The third switching unit 123 switches based on the control signal C3, connecting its first terminal T7 to its second terminal T8. Therefore, the second neutral terminal N2 of the power output unit 130 is electrically connected to the first neutral terminal N1 of the power input unit 110, and the power output unit 130 outputs the second power supply V2. In this embodiment, since the voltage difference between the live wire terminal L and the second neutral wire terminal N2 of the power output unit 130 is the same as the voltage difference between the first voltage output terminal 111 and the first neutral wire terminal N1 of the power input unit 110, the second output power V2 is the same as the voltage difference between the first voltage output terminal 111 and the first neutral wire terminal N1 of the power input unit 110. In this embodiment, the second output power V2 is, for example, 120V, but the invention is not limited thereto.

Therefore, the power output module 100 of this application can provide a corresponding output power to the electronic device 3 according to the operating mode and control signals (e.g., control signals C1, C2, C3) of the electronic device 3. Thus, when the electronic device 3 is operating in power-saving mode, the power control system 1 of this application can output a second output power V2 with a lower voltage, thereby reducing the power consumption of the power control system 1 and achieving the purpose of power saving.

In one embodiment, the power control system 1 may include multiple power output modules 100, each of which is electrically connected to an electronic device 3. The power control system 1 may provide a corresponding output power through the power output modules 100, depending on the operating mode of the connected electronic device 3.

Referring to Figure 6, in one embodiment, the status acquisition module 300 in Figure 1 can be implemented by a communication module 310. The communication module 310 is electrically connected to the processor module 200 and communicates with the electronic device 3 via wired or wireless means. The communication module 310 receives sleep or wake-up signals (status signals) from the electronic device 3 and outputs the status signals to the processor module 200. Therefore, the processor module 200 can confirm whether the electronic device 3 is operating in working mode or power-saving mode based on the received wake-up or sleep signals, and generate corresponding control signals C1~C3 based on the working mode or power-saving mode. When the processor module 200 receives a wake-up signal, the processor module 200 determines that the electronic device 3 is operating in working mode. When the processor module 200 receives a sleep signal, the processor module 200 determines that the electronic device 3 is operating in power-saving mode.

In one embodiment, the communication module 310 may be a communication circuit that conforms to the specifications of a wireless local area network or an Ethernet network, and this application is not limited thereto.

Referring to Figure 7, in another embodiment, the status acquisition module 300 in Figure 1 can be implemented by a current detection unit 320. The current detection unit 320 is located between the live wire terminal L of the power output unit 130 and the processor module 200. The current detection unit 320 is used to sense the current at the live wire terminal L and provides the sensed current value to the processor module 200. Therefore, the processor module 200 can calculate the power of the electronic device 3 based on the received sensed current value, and determine whether the electronic device 3 is operating in a working mode or a power-saving mode based on the power of the electronic device 3, so as to generate corresponding control signals C1~C3 based on the working mode or power-saving mode. Referring also to Figure 13, for example, when the processor module 200 determines that the power P of the electronic device 3 rises to tens or hundreds of watt-hours within a time interval (e.g., time interval TD1), the processor module 200 determines that the electronic device 3 switches from power-saving mode to operating mode. Therefore, in the next time interval TD2, based on the fact that the electronic device 3 has been determined to be operating in operating mode, the output power of the power output module 100 rises to the voltage value of the first output power V1. In this way, the power output module 100 can identify the current operating mode of the electronic device 3 simply by detecting power changes, without waiting for status signals from the electronic device 3. The power output module 100 can provide the corresponding output power more instantly according to the operating mode of the electronic device 3.

In one embodiment, the current detection unit 320 may be implemented by a circuit including components such as a shunt resistor, an operational amplifier, and an analog-to-digital converter, and this application is not limited thereto. The implementation of the current detection unit 320 may be designed according to the needs of those skilled in the art, and will not be described in detail here.

Please refer to Figures 8 to 10. Figure 8 is a schematic diagram of the system architecture of the power control system 1. Figure 9 is a schematic diagram of the configuration of the zero-crossing-point detection circuit. Figure 10 is a schematic diagram of another configuration of the zero-crossing-point detection circuit. In this embodiment, the power control system 1 further includes a zero-crossing-point detection circuit 140. The zero-crossing-point detection circuit 140 is electrically connected to the processor module 200 and electrically connected between the live wire terminal L and the second neutral wire terminal N2 of the power output unit 130. The zero-crossing-point detection circuit 140 is used to output a zero-crossing-point detection signal based on the output power change between the live wire terminal L and the second neutral wire terminal N2. Therefore, the processor module 200 can determine the zero-crossing point of the output power supply waveform based on the zero-crossing point detection signal, and output control signals C1~C3 to the switching unit 120 based on the time point of the zero-crossing point, so that the switching unit 120 can switch at the zero-crossing point, reducing the switching loss of the switching unit 120. In some embodiments, the zero-crossing point detection circuit 140, the processor module 200 and the status acquisition module 300 can also be integrated into the same integrated circuit, or arbitrarily combined into different integrated circuits, as long as they can receive status signals, output zero-crossing point detection signals and send corresponding control signals to the power output module 100, they are within the protection scope of this invention.

Please refer to Figures 1 and 14 simultaneously. Figure 14 is a flowchart illustrating the operation of the power control system of this application. The operation method includes steps S100 to S500.

Step S100: Confirm the operating mode of the electronic device based on the received status signal. In one embodiment, the processor module 200 may confirm that the electronic device 3 is operating in a working mode or a power-saving mode based on the received wake-up signal or sleep signal. In one embodiment, the processor module 200 may calculate the power of the electronic device 3 based on the received sensed current value, and confirm that the electronic device 3 is operating in a working mode or a power-saving mode based on the power of the electronic device 3.

Step S200: Determine whether the output power waveform is at a zero-crossing point. If yes, proceed to step S300; otherwise, return to step S200 and continue determining whether the output power waveform is at a zero-crossing point. In this step, the processor module 200 determines the zero-crossing point of the output power waveform based on the zero-crossing point detection signal generated by the zero-crossing point detection circuit 140.

Step S300: Set the switching unit. In this step, the processor module 200 generates a corresponding control signal based on the operating mode of the electronic device 3 and provides the control signal to the switching unit 120, so that the switching unit 120 switches based on the received control signal.

Step S400: Is the output power supply different from the previous output power supply? In this step, the processor module 200 monitors whether the output power supply has changed (from the first output power supply V1 to the second output power supply V2 or from the second output power supply V2 to the first output power supply V1). If the determination is yes, it means that the adjustment of the output power supply has been completed (S500); otherwise, return to step S200. Step S400 ensures that the output power supply has been adjusted according to the operating mode of the electronic device 3.

In summary, the power control system of this application can output a second power supply with a lower voltage value to the electronic device when the device is in power-saving mode. Therefore, the power control system of this application can output a lower voltage power supply when the electronic device is in power-saving mode, thus achieving lower power consumption and saving power.

1: Power Control System 2: AC Power Supply 3: Electronic Device 100: Power Output Module 110: Power Input Unit 111: First Voltage Output Terminal 112: Second Voltage Output Terminal 120: Switching Unit 121: First Switching Unit 122: Second Switching Unit 123: Third Switching Unit 130: Power Output Unit 140: Zero Crossover Point Detection Circuit 200: Processor Module 300: Status Acquisition Module 310: Communication Module 320: Current Detection Unit C1, C2, C3: Control Signals L: Live Wire Terminal N1: First Neutral Terminal N2: Second Neutral Terminal P: Power T1, T4, T7: First terminal T2, T5, T8: Second terminal T3, T6, T9: Third terminal TD1, TD2: Time interval V1: First output power supply V2: Second output power supply S100~S500: Steps

Figure 1 is a schematic diagram of an embodiment of the power control system of this application.

Figure 2 is a schematic diagram of an embodiment of the power output module of this application operating in working mode.

Figure 3 is a schematic diagram of an embodiment of the power output module of this application operating in power saving mode.

Figure 4 is a schematic diagram of another embodiment of the power output module of this application operating in working mode.

Figure 5 is a schematic diagram of another embodiment of the power output module of this application operating in power saving mode.

Figure 6 is another system architecture diagram of the power output module of this application.

Figure 7 is another system architecture diagram of the power output module of this application.

Figure 8 is another system architecture diagram of the power output module of this application.

Figure 9 is a schematic diagram of an embodiment three of the power output module of this application.

Figure 10 is a schematic diagram of Embodiment 4 of the power output module of this application.

Figure 11 is a waveform diagram of the output power supply of this application.

Figure 12 is another waveform diagram of the output power supply of this application.

Figure 13 is a schematic diagram of the power waveform of this application.

Figure 14 is a flowchart illustrating the operation of the power control system of this application.

1: Power Control System

2: AC power supply

3: Electronic Devices

100: Power Output Module

110: Power Input Unit

120: Switching Unit

130: Power Output Unit

200: Processor Module

300: Status Acquisition Module

Claims (9)

A power control system supplies power to an electronic device, the electronic device being operable in an operating mode and a power-saving mode. The power control system includes: a power input unit receiving an AC power source, the power input unit having a first voltage output terminal, a second voltage output terminal, and a first neutral terminal; a power output unit having a live wire terminal and a second neutral terminal, the live wire terminal being electrically connected to the first voltage output terminal of the power input unit; and a switching unit electrically connected between the power input unit and the power output unit; In the operating mode, the switching unit switches to connect the second neutral line to the second voltage output terminal of the power input unit, and the power output unit outputs a first power supply to power the electronic device. In the power-saving mode, the switching unit switches to connect the second neutral line to the first neutral line, and the power output unit outputs a second power supply to power the electronic device. The power control system as described in claim 1 further includes: a zero-crossing detection circuit electrically connected between the live wire terminal and the second neutral wire terminal of the power output unit, the zero-crossing detection circuit being used to output a zero-crossing detection signal; and a processor module electrically connected to the switching unit and the zero-crossing detection circuit, the processor module receiving the zero-crossing detection signal and generating a switching control signal based on the zero-crossing detection signal, the switching unit switching based on the switching control signal. The power control system as described in claim 1 further includes a current detection unit electrically connected between the live wire terminal and the second neutral wire terminal of the power output unit. The current detection unit is used to output a current detection signal to the processor module, and the processor module confirms that the electronic device is operating in the working mode or the power saving mode based on the current detection signal. The power control system as described in claim 1 further includes a communication module electrically connected to the processor module for outputting a sleep signal or a wake-up signal from the electronic device to the processor module, the processor module confirming that the electronic device is operating in the working mode or the power-saving mode based on the wake-up signal or the sleep signal. The power control system as claimed in claim 1, wherein the switching unit is electrically connected between the second neutral terminal of the power output unit and the first neutral terminal and the second voltage output terminal of the power input unit. The power control system as described in claim 5, wherein the switching unit includes a first switching unit and a second switching unit, the first switching unit being electrically connected between the first neutral terminal of the power input unit and the second neutral terminal of the power output unit, and the second switching unit being electrically connected between the second voltage output terminal of the power input unit and the second neutral terminal of the power output unit. A method for operating a power control system, the power control system supplying power to an electronic device, the electronic device being operable in a working mode and a power-saving mode, the power control system including a power input unit, a switching unit, and a power output unit, the power input unit receiving an AC power source, the power input unit having a first voltage output terminal, a second voltage output terminal, and a first neutral terminal, the power output unit having a live wire terminal and a second neutral wire terminal, the first voltage output terminal of the power input unit being electrically connected to the live wire terminal of the power output unit, the method of operation including: In this operating mode, the switching unit is switched so that the second neutral terminal of the power output unit is connected to the second voltage output terminal of the power input unit, and the power output unit outputs a first output power to supply power to the electronic device; and In the power-saving mode, the switching unit is switched so that the second neutral terminal of the power output unit is connected to the first neutral terminal of the power input unit, and the power output unit outputs a second output power to supply power to the electronic device. The method of operating the power control system as described in claim 7 further includes: causing a processor module to confirm, based on a received status signal, that the electronic device is operating in the operating mode or the power-saving mode. The method of operating the power control system as described in claim 8, wherein the status signal includes a current detection signal of the power control system and a sleep signal or a wake-up signal from the electronic device.