TWI894997B - Power supply system, electronic device and operation method thereof - Google Patents

Abstract

The present application is related to a power supply system, an electronic device and an operation method thereof. The power supply system comprises a power supply module, a control resistor and a control circuit. A first end and a second end of the control circuit is shorted in an operating mode to enable the power supply module to output an operating voltage. The first end and the second end of the control circuit is opened in a standby mode to enable the power supply module to output a standby voltage. The operating voltage is higher than the standby voltage. Therefore, the standby power consumption of the electronic device is effectively reduced, and the purpose of energy saving is achieved.

Description

Power supply system, electronic device and operation method thereof

This application relates to a power supply system, an electronic device, and an operating method thereof, and in particular to a power supply system, an electronic device, and an operating method thereof that can reduce standby power consumption.

To quickly activate and provide service, existing electronic products are typically kept in standby mode rather than shut down when not in use. In standby mode, electronic products only need to keep some circuits running, thus requiring less power.

However, to reduce power consumption, circuits not required for standby operation or the conversion efficiency of transformers are often shut down to reduce overall power consumption. However, if the transformer in an electronic product continues to output normal operating voltage, the overall power consumption of the electronic product cannot be effectively reduced, resulting in energy waste. Conventional methods for reducing standby power consumption in electronic products generally use a pulse width modulation (PWM) controller to change the duty cycle of the transformer's primary voltage. However, this method cannot further reduce power consumption based on the needs of the electronic product's internal components.

Therefore, how to effectively reduce the standby power consumption of electronic products to save energy and electricity has become one of the problems that need to be solved urgently in this field.

To solve the above technical problems, this application proposes a power supply system, an electronic device, and an operating method thereof. By reducing the output voltage of the power supply system, the standby power consumption of the electronic device is effectively reduced, thereby achieving the purpose of energy saving.

To achieve the above-mentioned objectives, the present application provides a power supply system for an electronic device, comprising a power supply module, a control resistor, and a control circuit. The power supply module has a power output terminal. The control resistor has a first terminal and a second terminal, the first terminal of the control resistor being electrically connected to the power supply module, and the second terminal of the control resistor being electrically connected to a first low voltage. The control circuit has a first terminal and a second terminal, the first terminal of the control circuit being electrically connected to the first terminal of the control resistor, and the second terminal of the control circuit being electrically connected to a second low voltage. The first end of the control circuit and the second end of the control circuit form a short circuit in an operating mode, at which time the control resistor does not act on the power supply module so that the power output terminal outputs an operating voltage. The first end of the control circuit and the second end of the control circuit form an open circuit in a standby mode, at which time the control resistor acts on the power supply module so that the power output terminal outputs a standby voltage, the operating voltage being higher than the standby voltage, and both the operating voltage and the standby voltage being higher than the first low voltage and the second low voltage.

To achieve the above-mentioned objectives, this application proposes an electronic device comprising the aforementioned power supply system, a voltage regulator module, and a control system. The voltage regulator module is electrically connected to the power supply system, and the control system is electrically connected to the voltage regulator module and the control circuit of the power supply system.

To achieve the above-mentioned objectives, the present application proposes an operating method for an electronic device, which includes the above-mentioned power supply system. The operating method includes: in the operating mode, the control circuit is short-circuited, at which time the control resistor does not act on the power supply module so that the output voltage of the power output terminal is the operating voltage; and in the standby mode, the control circuit is open-circuited, at which time the control resistor acts on the power supply module so that the output voltage of the power output terminal is the standby voltage, wherein the operating voltage is higher than the standby voltage.

Based on the above, this application reduces the output voltage of the power supply module when the electronic device is in standby mode by disconnecting the control circuit and adjusting the output voltage of the power supply module to the standby voltage. This allows the electronic device to operate at a lower voltage, effectively reducing the overall power consumption of the electronic device and achieving the purpose of saving energy and electricity.

Please refer to Figure 1, which is a schematic diagram of an embodiment of the electronic device of the present application. Electronic device 1 includes a power supply system 10, a voltage regulator module 20, and a control system 30. The voltage regulator module 20 is electrically connected to the power supply system 10, and the control system 30 is electrically connected to the power supply system 10 and the voltage regulator module 20.

In this embodiment, the voltage regulator module 20 includes a plurality of voltage regulators 21. Each voltage regulator 21 has a first end and a second end. The first end of each voltage regulator 21 is electrically connected to the power supply system 10, and the second end of each voltage regulator 21 is electrically connected to the control system 30. The voltage regulators 21 are used to receive the output voltage of the power supply system 10 and regulate the received output voltage to generate a regulated voltage. The regulated voltages output by the voltage regulators 21 can be the same or different.

In one embodiment, the voltage regulator 21 is, for example, a linear voltage regulator or a switching voltage regulator, and the present application is not limited thereto.

The control system 30 includes a plurality of circuit components that maintain the operation of the electronic device 1, and each circuit component is individually electrically connected to a corresponding voltage regulator 21. In the present embodiment, the control system 30 may include at least a processor 31, a communication circuit 32, and an amplifier circuit 33, and the present application is not limited thereto. In the present embodiment, the processor 31, the communication circuit 32, and the amplifier circuit 33 are individually electrically connected to a corresponding voltage regulator 21 to receive a regulated voltage from the voltage regulator 21. In the present embodiment, the processor 31 is used to determine whether the electronic device 1 is operating in an operating mode or a standby mode based on whether an operating signal is received, and outputs a control signal indicating the operating mode or the standby mode to the power supply system 10. When processor 31 determines that electronic device 1 is operating in standby mode, processor 31 may further be configured to disable the operation of certain circuit components (e.g., shut down amplifier circuit 33), thereby reducing the voltage required for electronic device 1 to maintain operation and thereby reducing power consumption. The operating signal may be, for example, an operating signal triggered by a user operating electronic device 1 or a preset operating signal generated by control system 30, and this application is not limited thereto.

In this embodiment, the electronic device 1 is, for example, an audio amplifier, a printer, or other electronic device, and this application is not limited thereto.

Please refer to FIG2 , which is a schematic diagram of an embodiment of the power supply system 10 of the present application. In this embodiment, the power supply system 10 includes a power supply module 11 , a control resistor 12 , and a control circuit 13 .

In this embodiment, the power supply module 11 further includes a transformer circuit 111 , a PWM controller 112 , an optical coupling circuit 113 , a voltage regulator 114 , a first resistor 115 , and a second resistor 116 .

The first resistor 115 has a first end and a second end. The first end of the first resistor 115 is electrically connected to the power output terminal of the power supply module 11. The second resistor 116 has a first end and a second end. The first end of the second resistor 116 is electrically connected to the second end of the first resistor 115 to form a first node A. The second end of the second resistor 116 is electrically connected to the first end of the control resistor 12 and one end of the control circuit 13. In one embodiment, the resistance of the first resistor 115 can be 4.7K ohms, and the resistance of the second resistor 116 can be 3.9K ohms, but this application is not limited to this.

The voltage regulator 114 is electrically connected to the optical coupling circuit 113 and the first node A, and is located between the optical coupling circuit 113 and the first node A. The voltage regulator 114 can be, but is not limited to, a precise voltage reference element (shunt regulator) for outputting a stable voltage (which can be, but is not limited to, 2.5V) to the first node A.

The optical coupling circuit 113 is electrically connected to the voltage regulating element 114 and the PWM controller 112 and is located between the voltage regulating element 114 and the PWM controller 112 . The optical coupling circuit 113 transmits the regulated voltage to the PWM controller 112 in an electrically isolated manner using light as a medium.

The PWM controller 112 is electrically connected to the optical coupling circuit 113 and the transformer circuit 111, and is located between the optical coupling circuit 113 and the transformer circuit 111. The PWM controller 112 is used to generate a corresponding PWM control signal according to the received stable voltage.

The transformer circuit 111 has a power input terminal and a power output terminal C (i.e., the power output terminal of the power supply module 11). The power input terminal is used to receive an alternating current power AC, and the power output terminal C is used to output an output voltage. The transformer circuit 111 is used to generate the output voltage according to the received PWM control signal.

In this embodiment, the control resistor 12 has a first end and a second end. The first end of the control resistor 12 is electrically connected to the power supply module 11, and the second end of the control resistor 12 is electrically connected to a first low voltage. Furthermore, the first end of the control resistor 12 is electrically connected to the second end of the second resistor 116.

In this embodiment, one end of the control circuit 13 is electrically connected to the first end of the control resistor 12 , and the other end of the control circuit 13 is electrically connected to the processor 31 .

Please refer to Figures 2 and 3 . Figure 3 is a schematic diagram of an embodiment of the control circuit 13. In this embodiment, the control circuit 13 includes a transistor 131 and a resistor 132. Transistor 131 has a first terminal, a second terminal, and a control terminal. Resistor 132 has a first terminal and a second terminal. The first terminal of transistor 131 is electrically connected to the first terminal of the control resistor 132, and the second terminal of transistor 131 is electrically connected to a second low voltage. The control terminal of transistor 131 is electrically connected to the first terminal of resistor 132, and the second terminal of resistor 132 is electrically connected to the processor 31. The second terminal of resistor 132 is used to receive a control signal from processor 31.

In one embodiment, the resistance of the resistor 132 may be 4.7K ohms, and the present application is not limited thereto.

When the electronic device 1 operates in an operating mode, the processor 31 outputs a control signal representing the operating mode to the transistor 131. Based on the received control signal, the transistor 131 turns on its first and second terminals. When the electronic device 1 operates in a standby mode, the processor 31 outputs a control signal representing the standby mode to the transistor 131. Based on the received control signal, the transistor 131 turns off its first and second terminals. The control signal may be a voltage signal.

Therefore, when the electronic device 1 is operating in an operating mode, the second node B is electrically connected to the second low voltage due to the conductive transistor 131 (considered a short circuit). At this time, the control resistor 12 does not divide the voltage with the second resistor 116 (does not act on the power supply module 11), and the power output terminal C outputs the operating voltage. When the electronic device 1 is operating in a standby mode, the second node B is disconnected from the second low voltage due to the non-conductive transistor 131. At this time, the control resistor 12 divides the voltage with the second resistor 116 (acts on the power supply module 11), and the power output terminal C outputs the standby voltage.

In this embodiment, the operating voltage is higher than the standby voltage, and both the operating voltage and the standby voltage are higher than the first low voltage and the second low voltage. In one embodiment, the first low voltage and the second low voltage are ground voltages.

Thus, when the electronic device 1 is operating in operating mode, the processor 31 can provide a control signal to cause the power supply system 10 to normally output an operating voltage. Furthermore, when the electronic device 1 is operating in standby mode, the processor 31 can provide a control signal to cause the power supply system 10 to output a standby voltage. Compared to existing technologies that simply vary the duty cycle of the transformer's primary voltage via a pulse width modulation controller, the present invention, through the control resistor 12 and control circuit 13, can further reduce the voltage at the power output terminal C in standby mode based on the requirements of the load component (e.g., the processor 31), thereby effectively reducing the overall power consumption of the electronic device and achieving energy conservation.

Please refer to Figures 1 to 4. Figure 4 is a schematic diagram of the step flow of the operating method of the electronic device of this application, which includes the following steps.

Step S110: Determine whether the electronic device 1 is in the working mode. The processor 31 determines whether the electronic device 1 is in the working mode or the standby mode based on whether the working signal is received. If the processor 31 receives the working signal, step S120 is executed; otherwise, step S140 is executed.

Step S120: Operation in Working Mode. In this step, when the processor 31 receives the working signal, the processor 31 generates a control signal corresponding to the working signal. The control circuit 13 short-circuits its first and second terminals according to the control signal, causing the power output terminal C of the power supply module 11 to output the working voltage.

Step S130: Determine whether the duration of not receiving an operating signal exceeds a time threshold. In this step, processor 31 continuously determines whether an operating signal has been received. If the duration of not receiving an operating signal exceeds the time threshold, processor 31 determines that electronic device 1 has entered a standby state and executes step S140. Otherwise, electronic device 1 is still in an operating state and returns to step S120.

In one embodiment, the time threshold can be selected according to needs, such as 5 minutes or 30 minutes, and this application is not limited to this.

Step S140: Operating in Standby Mode. In this step, the processor 31 determines that the electronic device 1 is in standby mode. Therefore, the processor 31 provides a corresponding control signal, causing the control circuit 13 to open the first and second terminals according to the control signal, thereby causing the power output terminal C of the power supply module 11 to output a standby voltage.

In summary, the present application reduces the output voltage of the power supply module when the electronic device is in standby mode by disconnecting the control circuit and adjusting the output voltage of the power supply module to a standby voltage lower than the operating voltage. This allows the electronic device to operate at a lower voltage, effectively reducing the overall power consumption of the electronic device and achieving the purpose of saving energy and electricity.

1: Electronic device 10: Power supply system 11: Power supply module 111: Transformer circuit 112: PWM controller 113: Optocoupler circuit 114: Voltage regulator 115: First resistor 116: Second resistor 12: Control resistor 13: Control circuit 131: Transistor 132: Resistor 20: Voltage regulator module 21: Voltage regulator 30: Control system 31: Processor 32: Communication circuit 33: Amplifier circuit A: First node B: Second node C: Power output terminal AC: Alternating current power supply S110, S120, S130, S140: Steps

Figure 1 is a schematic diagram of an embodiment of the electronic device of the present application; Figure 2 is a schematic diagram of an embodiment of the power supply system of the present application; Figure 3 is a schematic diagram of an embodiment of the control circuit of the present application; and Figure 4 is a schematic flow diagram of the operating method of the electronic device of the present application.

10: Power supply system

11: Power supply module

111: Transformer circuit

112: PWM controller

113: Optocoupler Circuit

114: Voltage Regulator

115: First resistor

116: Second resistor

12: Control resistor

13: Control circuit

21: Voltage Regulator

31: Processor

A: First Node

B: Second Node

C: Power output terminal

AC: alternating current power

Claims (10)

A power supply system for an electronic device includes: a power supply module having a power output terminal; a control resistor having a first terminal and a second terminal, the first terminal of the control resistor being electrically connected to the power supply module and the second terminal of the control resistor being electrically connected to a first low voltage; and a control circuit having a first terminal and a second terminal, the first terminal of the control circuit being electrically connected to the first terminal of the control resistor and the second terminal of the control circuit being electrically connected to a second low voltage. The first end of the control circuit and the second end of the control circuit form a short circuit in an operating mode, in which case the control resistor does not act on the power supply module, causing the power output terminal to output an operating voltage. The first end of the control circuit and the second end of the control circuit form an open circuit in a standby mode, in which case the control resistor acts on the power supply module, causing the power output terminal to output a standby voltage. The operating voltage is higher than the standby voltage, and both the operating voltage and the standby voltage are higher than the first low voltage and the second low voltage. A power supply system as described in claim 1, wherein the control circuit includes a transistor and a resistor, the transistor having a first end, a second end and a control end, the resistor having a first end and a second end, the first end of the transistor being electrically connected to the first end of the control resistor, the second end of the transistor being grounded, the control end of the transistor being electrically connected to the first end of the resistor, and the second end of the resistor being electrically connected to the processor of the electronic device. The power supply system as described in claim 2, wherein the first end and the second end of the transistor are conductive in the working mode, and the first end and the second end of the transistor are non-conductive in the standby mode. The power supply system of claim 1, wherein the power supply module comprises: a first resistor having a first end and a second end, the first end of the first resistor being electrically connected to the power output terminal; and a second resistor having a first end and a second end, the first end of the second resistor being electrically connected to the second end of the first resistor to form a first node, the second end of the second resistor being electrically connected to the first end of the control resistor and the first end of the control circuit. The power supply system of claim 4, wherein the power supply module comprises: a voltage regulator electrically connected to the first node; an optocoupler circuit electrically connected to the voltage regulator; a PWM controller electrically connected to the optocoupler circuit; and a transformer circuit electrically connected to the PWM controller, the transformer circuit having a power input terminal and a power output terminal, the power input terminal receiving an AC voltage, and the power output terminal outputting the operating voltage and the standby voltage. An electronic device comprising: The power supply system of claim 1; a voltage regulator module electrically connected to the power supply system; and a control system electrically connected to the voltage regulator module and the control circuit of the power supply system. The electronic device of claim 6, wherein the voltage regulator module includes a linear voltage regulator or a switching voltage regulator. The electronic device as described in claim 6, wherein the control system includes a processor, and the processor is electrically connected to the voltage regulating module and the control circuit. A method for operating an electronic device, the electronic device including the power supply system of claim 1, the method comprising: In the operating mode, the control circuit is short-circuited, wherein the control resistor does not act on the power supply module, so that the output voltage of the power output terminal is the operating voltage; and In the standby mode, the control circuit is open-circuited, wherein the control resistor acts on the power supply module, so that the output voltage of the power output terminal is the standby voltage, wherein the operating voltage is higher than the standby voltage. The operating method of claim 9 further comprises: When the duration of the electronic device not receiving an operating signal exceeds a time threshold, the electronic device switches from the operating mode to the standby mode.