Power supply management and control circuit capable of effectively saving power when specified power is achieved

Abstract

The invention discloses a power supply control circuit capable of effectively saving power when specified power is achieved. The capacitor and the first end of the third switch assembly are connected with the first end of the power supply device. First ends of the first and second switch assemblies are connected with a second end of the capacitor. Second ends of the first and second switch assemblies are connected with a second end of the power supply device. The first end of the fourth switch assembly is connected with the second end of the third switch assembly. The control circuit of the power supply management and control circuit controls the first to third switch assemblies, and the driving circuit of the power supply management and control circuit drives the fourth switch assembly, so that the current flowing to the second end of the power supply device is not less than a current threshold.

Description

Technical Field

[0001] The present invention relates to a power supply control circuit, and more particularly to a power supply control circuit which can effectively save power when a specified power is achieved. Background Art

[0002] In recent years, with the development of technology, the functions of electronic devices have been increasing, and the power consumption has increased significantly. Therefore, the power supply device supplies power to the power converter, and then the power converter converts the power and supplies it to the electronic device. The power supply efficiency needs to be further improved.

[0003] When the power supply device supplies power to the power converter, the system will detect whether the return power supply device current is greater than the current threshold, and judge whether the power supply device is connected to the power converter. If the system detects that the return power supply device current is less than the current threshold for more than a specified time, it will be regarded as the power converter has been removed. At this time, the power supply device will be required to stop supplying current, resulting in the power converter being unable to continuously supply power to the electronic device, resulting in reduced operating efficiency of the electronic device.

[0004] In order for the power supply device to maintain power supply to the power converter, when the current flowing back to the power converter is less than the current threshold, additional current must be drawn within a specified time to meet the specification of the power supply device, thereby causing additional power loss. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a power supply control circuit that effectively saves power when the specified power is achieved in view of the shortcomings of the prior art. The power supply control circuit includes a capacitor, a first switch component, a second switch component, a fourth switch component, a drive circuit, a detection circuit and a control circuit. The first end of the capacitor is connected to the first end of the power supply device and the first end of the load. The second end of the capacitor is connected to the second end of the load. The first end of the first switch component is connected to the second end of the capacitor. The second end of the first switch component is connected to the second end of the power supply device. The first end of the second switch component is connected to the second end of the capacitor. The second end of the second switch component is connected to the second end of the power supply device. The first end of the third switch component is connected to the first end of the power supply device. The first end of the fourth switch component is connected to the second end of the third switch component. The second end of the fourth switch component is connected to the second end of the power supply device. The drive circuit is connected to the control end of the fourth switch component. The detection circuit is connected to the second end of the capacitor. The control circuit is connected to the control end of the first switch component, the control end of the second switch component, the control end of the third switch component and the detection circuit. The driving circuit drives the fourth switch component, and the control circuit controls the operation of the first switch component, the second switch component and the third switch component according to the voltage of the second end of the capacitor detected by the detection circuit, so that the total current fed back to the second end of the power supply device is not less than a current threshold indicated by an electric power regulation requirement within a specified time, and the power consumption required to be additionally consumed is reduced.

[0006] As described above, the present invention provides a power supply control circuit that effectively saves power when the specified power is achieved. The power supply control circuit that effectively saves power when the specified power is achieved can make the current flowing back to the power supply device meet a current threshold required by the power specification after the power supply device supplies current, so as to prevent the power supply device from being determined to be unconnected to the load and being required to stop supplying current, resulting in the operation of the load, such as the power supply efficiency of the power converter supplying power to the electronic device being affected, and can make the power supply device operate normally without wasting additional power consumption (or minimizing the power consumption that needs to be consumed additionally), so as to achieve efficiency optimization.

[0007] To further understand the features and technical contents of the power supply control circuit, please refer to the following detailed description and diagrams of the power supply control circuit. However, the diagrams provided are only for reference and description and are not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 FIG. 1 is a circuit diagram of a power supply control circuit for effectively saving power while achieving specified power according to a first embodiment of the present invention.

[0009] Figure 2 This is a circuit diagram of a power supply control circuit for effectively saving power under a specified power consumption when the first switch component, the second switch component and the third switch component are turned off according to the first embodiment of the present invention.

[0010] Figure 3 It is a schematic diagram of the flow direction of current when the first switch component in the power supply control circuit for effectively saving power under the condition of achieving specified power according to the first embodiment of the present invention is turned on.

[0011] Figure 4 It is a schematic diagram of the current flow when the first, third and fourth switch components in the power supply control circuit for effectively saving power under the condition of achieving specified power according to the first embodiment of the present invention are turned on.

[0012] Figure 5 FIG. 1 is a circuit diagram of a power supply control circuit for effectively saving power while achieving specified power according to a second embodiment of the present invention.

[0013] Figure 6 Flow chart of execution steps of a power supply control circuit for effectively saving power under a specified power level according to a first embodiment of the present invention.

[0014] Figure 7 The flowchart is a flowchart of the steps executed when the power supply control circuit for effectively saving power under the condition of achieving the specified power is used for heavy load according to the first embodiment of the present invention.

[0015] Figure 8 The waveform diagram of the signals of the power supply control circuit for effectively saving power under the condition of achieving the specified power according to the first and second embodiments of the present invention.

[0016] Fig. 9 The waveform diagram of the signals of the power supply control circuit for effectively saving power under the condition of achieving the specified power according to the first and second embodiments of the present invention.

[0017] Fig.10 The waveform diagram of the signals of the power supply control circuit for effectively saving power under the condition of achieving the specified power according to the first and second embodiments of the present invention.

[0018] Fig.11 The waveform diagram of the signals of the power supply control circuit for effectively saving power under the condition of achieving the specified power according to the first and second embodiments of the present invention.

[0019] Fig.12 The waveform diagram of the signals of the power supply control circuit for effectively saving power under the condition of achieving the specified power according to the first and second embodiments of the present invention.

[0020] Fig.13 The waveform diagram of the signals of the power supply control circuit for effectively saving power under the condition of achieving the specified power according to the first and second embodiments of the present invention.

[0021] Fig.14 Schematic diagram of the connection state between the power-saving supply control circuit that meets the power supply specification and the load that changes with time according to the first and second embodiments of the present invention. DETAILED DESCRIPTION

[0022] The following is an explanation of the implementation of the power supply control circuit through specific specific embodiments. Those skilled in the art can understand the advantages and effects of the power supply control circuit from the contents disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and the details in this specification can also be modified and changed in various ways based on different viewpoints and applications without departing from the concept of the power supply control circuit. In addition, the drawings of the power supply control circuit are only simple schematic illustrations and are not depicted according to actual dimensions. It is stated in advance. The following implementations will further explain in detail the relevant technical contents of the power supply control circuit, but the disclosed contents are not intended to limit the scope of protection of the power supply control circuit. In addition, the term "or" used in this article may include any one or more combinations of the associated listed items depending on the actual situation.

[0023] See also Figure 1 ,in Figure 1 FIG. 1 is a circuit diagram of a power supply control circuit for effectively saving power when achieving a specified power according to a first embodiment of the present invention. Fig.14 Schematic diagram of the connection state between the power-saving supply control circuit that meets the power supply specification and the load that changes with time according to the first and second embodiments of the present invention.

[0024] like Figure 1 As shown, the power supply control circuit of the power supply control circuit includes a capacitor Cbulk, a first switch component SW1, a second switch component SW2, a third switch component SW3, a fourth switch component SW4, a control circuit CTR, a detection circuit DER and a drive circuit DRV.

[0025] One or more of the first switch element SW1 , the second switch element SW2 , the third switch element SW3 and the fourth switch element SW4 may be transistors, but the invention is not limited thereto.

[0026] If necessary, in any embodiment of the present invention, a filter circuit FLT may be further provided to connect the first terminal VDD and the second terminal VSS of the power supply device PSU, and to connect between the power supply device PSU and the power saving supply control circuit of the present invention.

[0027] The first end of the capacitor Cbulk is connected to the first end VDD (i.e., a positive end) of the power supply device PSU (through the filter circuit FLT). The first end of the capacitor Cbulk is also connected to the first end of the load LD (e.g., a power supply or other powered device). The second end of the capacitor Cbulk is connected to the second end of the load LD.

[0028] The first end of the first switch component SW1 is connected to the second end of the capacitor Cbulk. The second end of the first switch component SW1 is connected to the second end VSS (ie, a negative end) of the power supply device PSU (via the filter circuit FLT).

[0029] The first end of the second switch element SW2 is connected to the second end of the capacitor Cbulk. The second end of the second switch element SW2 is connected to the second end VSS (ie, a negative end) of the power supply device PSU (via the filter circuit FLT).

[0030] The first end of the third switch component SW3 is connected to the first end VDD (ie, a positive end) of the power supply device PSU (through the filter circuit FLT), and the second end of the third switch component SW3 is connected to the first end of the fourth switch component SW4.

[0031] The second end of the fourth switch component SW4 is connected to the second end VSS (ie, a negative end) of the power supply device PSU (via the filter circuit FLT). The drive circuit DRV is connected to the second end of the first switch component SW1 and the control end of the fourth switch component SW4.

[0032] The detection circuit DER is connected to the second end of the capacitor Cbulk and can detect a voltage VRTN at the second end of the capacitor Cbulk.

[0033] The control circuit CTR is connected to a control end of the first switch component SW1 , a control end of the second switch component SW2 , a control end of the third switch component SW3 and the detection circuit DER.

[0034] It is worth noting that the driving circuit DRV drives the fourth switch component SW4 (according to the voltage at the second end of the first switch component SW1), and the control circuit CTR controls the operation of the first switch component SW1, the second switch component SW2 and the third switch component SW3 according to the voltage VRTN at the second end of the capacitor Cbulk detected by the detection circuit DER, so that the total current fed back to the second end VSS (i.e., a negative end) of the power supply device PSU is not less than a current threshold (e.g., a current threshold value) indicated by a power protocol requirement within a specified time. Fig.14 - minimum load time shown).

[0035] For example, when the first terminal VDD (i.e., a positive terminal) of the power supply device PSU supplies current, the control circuit CTR turns off the second switch component SW2 and simultaneously turns on the first switch component SW1 (and the third switch component SW3, and the drive circuit DRV turns on the fourth switch component SW4), so that the current fed back to the second terminal VSS (i.e., a negative terminal) of the power supply device PSU is not less than a current threshold within a specified time.

[0036] Therefore, the power-saving supply control circuit of the present invention can control the supply current of the power supply device PSU so that the current fed back to the power supply device PSU is not less than a current threshold within a specified time, thereby preventing the power supply device PSU from being determined to be not connected to any load (such as a power supply or other powered device) and being required to stop supplying current.

[0037] See also Figures 1 to 4 , Figures 8 to 11 ,in Figure 2 This is a circuit diagram of a first embodiment of the present invention, in which the first switch component, the second switch component and the third switch component of the power supply control circuit for effectively saving power under the condition of achieving a specified power are closed. Figure 3 1 is a schematic diagram of the flow direction of current when the first switch component in the power supply control circuit for effectively saving power under a specified power is turned on according to the first embodiment of the present invention, Figure 4 Schematic diagram of the flow of current when the first, third and fourth switch components in the power supply control circuit for effectively saving power under a specified power are turned on according to the first embodiment of the present invention, Figures 8 to 11 The waveform diagram of the signals of the power supply control circuit for effectively saving power under the condition of achieving the specified power according to the first and second embodiments of the present invention.

[0038] like Figure 1 The power supply control circuit of the present invention can be implemented as follows: Figure 6 Steps S111 to S121 are shown.

[0039] First, when the first terminal VDD (ie, a positive terminal) of the power supply device PSU supplies current (eg Figures 8 to 13 When the current Ipse shown in FIG. 1 is high, the detection circuit DER can detect the current Ivss (such as the current Ipse) fed back to the second terminal VSS (ie, a negative terminal) of the power supply device PSU. Figure 6 Step S111 shown).

[0040] The control circuit CTR can control the operations of the first switch element SW1 , the second switch element SW2 and the third switch element SW3 according to the current Ivss fed back to the second terminal VSS (ie, a negative terminal) of the power supply device PSU detected by the detection circuit DER.

[0041] The control circuit CTR can determine whether the current Ivss detected by the detection circuit DER and fed back to the second terminal VSS (i.e., a negative terminal) of the power supply device PSU is less than a current threshold Ihold (e.g., Figure 6 Step S113 shown).

[0042] If the control circuit CTR determines that the current Ivss fed back to the second terminal VSS (i.e., a negative terminal) of the power supply device PSU is not less than a current threshold Ihold within a specified time, the control circuit CTR may continuously detect the current Ivss fed back to the second terminal VSS (i.e., a negative terminal) of the power supply device PSU (i.e., a negative terminal). Figure 6 Step S111 shown).

[0043] On the contrary, if the control circuit CTR determines that the current Ivss fed back to the second terminal VSS (ie, a negative terminal) of the power supply device PSU is less than a current threshold Ihold within a specified time, the control circuit CTR may Figure 2 As shown, the first switch component SW1, the second switch component SW2 and the third switch component SW3 are closed. Figure 6 Step S115 shown).

[0044] When the first switch component SW1, the second switch component SW2 and the third switch component SW3 are Figure 2 When the capacitor Cbulk is turned off, the current ILoad of the load LD continues to flow through the capacitor Cbulk. The result is, Figure 8 As shown, the voltage VRTN at the second end of the capacitor Cbulk gradually increases.

[0045] Therefore, after the first switch component SW1, the second switch component SW2, and the third switch component SW3 are closed for a period of time, the detection circuit DER can detect the voltage VRTN at the second end of the capacitor Cbulk. The control circuit CTR determines whether the voltage VRTN at the second end of the capacitor Cbulk detected by the detection circuit DER at this time is higher than the first voltage threshold Vth1 (e.g. Figure 6 In addition or alternatively, the control circuit CTR may determine whether the length of the closing time Toff of the first switch component SW1 (or the second switch component SW2) is longer than a closing time threshold Toffmax (such as Figure 6 Step S117 shown).

[0046] If the voltage VRTN at the second end of the capacitor Cbulk detected by the detection circuit DER is as follows: Figure 8 and Fig. 9When the voltage is higher than the first voltage threshold Vth1, or the closing time Toff of the first switch element SW1 (or the second switch element SW2) is longer than a closing time threshold Toffmax, the control circuit CTR can keep the second switch element SW2 closed, and can Figure 3 The first switch component SW1 can be turned on as shown or Figure 4 As shown, both the first switch component SW1 and the third switch component SW3 are turned on (as shown in FIG. Figure 6 Step S119 shown).

[0047] If the load LD is light load or no load, such as Fig.10 The load LD shown draws only a small amount of current ILoad from the power supply device PSU. At this time, the current Ivss received by the second terminal VSS (i.e., a negative terminal) of the power supply device PSU may be less than a current threshold Ihold. In this case, the control circuit CTR turns on the first switch component SW1, so that the current Isw1 flows through the first switch component SW1. At the same time, the control circuit CTR can also turn on the third switch component SW3, and the drive circuit DRV can turn on the fourth switch component SW4, so that the current Isw3 flows through the third switch component SW3 and the fourth switch component SW4 to the second terminal VSS (i.e., a negative terminal) of the power supply device PSU.

[0048] For example, the driving circuit DRV can detect the voltage at the second end of the first switch element SW1 to determine whether to turn on the fourth switch element SW4. When the driving circuit DRV detects that the voltage at the second end of the first switch element SW1 is lower than a reference voltage Vref, the driving circuit DRV can turn on the fourth switch element SW4. Figure 4 As shown, the first switch component SW1, the third switch component SW3 and the fourth switch component SW4 are turned on at the same time. At this time, the total current fed back to the second end VSS (i.e., a negative end) of the power supply device PSU is the sum of the current Isw1 that flows sequentially through the capacitor Cbulk and the first switch component SW1 to the second end VSS (i.e., a negative end) of the power supply device PSU and the current Isw3 that flows sequentially through the third switch component SW3 and the fourth switch component SW4.

[0049] After the first switch element SW1 is turned on, the current Isw1 flows sequentially through the capacitor Cbulk and the first switch element SW1 to the second terminal VSS (ie, a negative terminal) of the power supply device PSU. As a result, Fig. 9 As shown, the voltage VRTN at the second end of the capacitor Cbulk gradually decreases.

[0050] After the first switch component SW1 and the third switch component SW3 are turned on, the control circuit CTR can time the duration of the first switch component SW1 being turned on (and the duration of the third switch component SW3 being turned on), and the detection circuit DER can detect the voltage VRTN at the second end of the capacitor Cbulk.

[0051] The control circuit CTR can determine whether an on time Ton of the first switch element SW1 (and the third switch element SW3) is longer than an on time threshold Tomps (eg, Figure 6 In addition or alternatively, the control circuit CTR may determine whether the voltage VRTN at the second end of the capacitor Cbulk is lower than the second voltage threshold Vth2 (eg, Figure 6 Step S121 shown).

[0052] If an on time Ton of the first switch element SW1 (and the third switch element SW3) is longer than an on time threshold Tomps (and the voltage VRTN at the second end of the capacitor Cbulk is lower than the second voltage threshold Vth2 after the first switch element SW1 is turned on), the control circuit CTR turns off the first switch element SW1 and the third switch element SW3 (such as Figure 6 Step S123 shown).

[0053] See also Figure 1 , Figure 7 and Fig.12 and Fig.13 ,in Figure 7 It is a flowchart of the steps executed when the power supply control circuit that effectively saves power under the condition of achieving the specified power is used for heavy load according to the first embodiment of the present invention. Fig.12 The waveform diagram of the signal of the power supply control circuit for effectively saving power under the condition of achieving the specified power according to the first and second embodiments of the present invention is shown in FIG. Fig.13 The waveform diagram of the signals of the power supply control circuit for effectively saving power under the condition of achieving the specified power according to the first and second embodiments of the present invention.

[0054] The power supply control circuit can effectively save power when the specified power is achieved. Figure 7 The steps S211 to S215 shown in FIG. 1 are suitable for a case where the load LD is a heavy load. Fig.12 As shown, a larger current ILoad is drawn from the power supply unit PSU.

[0055] When the first terminal VDD (ie, a positive terminal) of the power supply device PSU supplies the current Ipse, the control circuit CTR can turn on the first switch element SW1 (and the third switch element SW3) (eg, Figure 7 Step S211 shown).

[0056] The control circuit CTR can determine whether the on time Ton of the first switch element SW1 (and the third switch element SW3) is longer than a maximum on time Tonmax (eg Figure 7 Step S213 shown).

[0057] Additionally or alternatively, the control circuit CTR may determine whether the duty cycle Duty of the current signal outputted by the first terminal VDD (ie, a positive terminal) of the power supply device PSU is greater than a duty cycle threshold Dmax (eg, Figure 7 Step S213 shown).

[0058] Additionally or alternatively, the control circuit CTR may determine whether the voltage VRTN at the second end of the capacitor Cbulk detected by the detection circuit DER is higher than a first voltage threshold Vth1 (eg, Figure 7 Step S213 shown).

[0059] When the on time Ton of the first switch component SW1 (and the third switch component SW3) is longer than a maximum on time Tonmax, the duty cycle DT of the signal of the current Ipse outputted from the first terminal VDD (i.e., a positive terminal) of the power supply device PSU is greater than a duty cycle threshold Dmax, or the voltage VRTN of the second terminal of the capacitor Cbulk is higher than the first voltage threshold Vth1, it means that the load current is large (exceeding the current threshold), and the system can be restored to the normal mode. The control circuit CTR can turn off the first switch component SW1 (and the third switch component SW3) and turn on the second switch component SW2 (such as Figure 7 Step S215 shown).

[0060] On the contrary, when the on time Ton of the first switch element SW1 (and the third switch element SW3) is not longer than a maximum on time Tonmax, the duty cycle DT of the signal of the current Ipse outputted from the first terminal VDD (i.e., a positive terminal) of the power supply device PSU is not greater than a duty cycle threshold Dmax, and the voltage VRTN at the second terminal of the capacitor Cbulk is not higher than the first voltage threshold Vth1, it means that the load current is still less than a current threshold, and therefore the system is maintained in the light load control mode (i.e., Figure 6 ).

[0061] See also Figure 5 , which is a circuit diagram of a power supply control circuit for effectively saving power while achieving specified power according to a second embodiment of the present invention.

[0062] The similarities between the second embodiment of the power supply control circuit and the first embodiment are not repeated herein.

[0063] The driving circuit DRV of the power supply control circuit of the second embodiment of the power supply control circuit includes a first operational amplifier OP, and the detection circuit DER includes a first comparator CMP1 and a second comparator CMP2.

[0064] The first input terminal of the first operational amplifier OP, such as the non-inverting input terminal, is coupled to a reference voltage Vref. The second input terminal of the first operational amplifier OP, such as the inverting input terminal, is connected to the second terminal of the first switch component SW1. The output terminal of the first operational amplifier OP is connected to the control terminal of the fourth transistor.

[0065] The first input terminal of the first comparator CMP1 is connected to the second terminal of the capacitor Cbulk, for example, the non-inverting input terminal. The second input terminal of the first comparator CMP1, for example, the inverting input terminal is coupled to the first voltage threshold Vth1. The output terminal of the first comparator CMP1 is connected to the control circuit CTR.

[0066] A first input terminal, such as a non-inverting input terminal, of the second comparator CMP2 is connected to the second terminal of the capacitor Cbulk. A second input terminal, such as an inverting input terminal, of the second comparator CMP2 is coupled to the second voltage threshold Vth2. An output terminal of the second comparator CMP2 is connected to the control circuit CTR.

[0067] When the control circuit CTR determines that the voltage VRTN at the second end of the capacitor Cbulk is higher than the first voltage threshold Vth1 according to the first comparison signal (the level) received from the output end of the first comparator CMP1, the control circuit CTR turns on the first switch element SW1 (and the third switch element SW3) and turns off the second switch element SW2.

[0068] After the first switch element SW1 (and the third switch element SW3) are turned on, the control circuit CTR receives a second comparison signal from the output terminal of the second comparator CMP2 and determines whether the voltage VRTN at the second terminal of the capacitor Cbulk is lower than a voltage threshold Vth2 according to the second comparison signal.

[0069] When the control circuit CTR determines that the voltage VRTN at the second end of the capacitor Cbulk is lower than the second voltage threshold Vth2 according to the second comparison signal received from the output end of the second comparator CMP2, the control circuit CTR turns off the first switch element SW1 and the third switch element SW3. At this time, the second switch element SW2 can remain turned off.

[0070] In summary, the present invention provides a power supply control circuit that effectively saves power when the specified power is achieved. The power supply control circuit that effectively saves power when the specified power is achieved can make the current flowing back to the power supply device meet a current threshold required by the power specification after the power supply device supplies current, so as to prevent the power supply device from being determined to be unconnected to the load and being required to stop supplying current, resulting in the operation of the load, such as the power supply efficiency of the power converter supplying power to the electronic device being affected, and can make the power supply device operate normally without wasting extra power consumption (or minimizing the extra power consumption) to achieve efficiency optimization.

[0071] The contents disclosed above are only preferred feasible embodiments of the present invention, and are not intended to limit the claims of the present invention. Therefore, all equivalent technical changes made using the description and drawings of the present invention are included in the claims of the present invention.

Claims

1. A power supply control circuit that effectively saves power when achieving a specified power, characterized in that: The power supply control circuit for effectively saving power under the condition of achieving the specified power includes: A capacitor, wherein a first end of the capacitor is connected to a first end of a power supply device and a first end of a load, and a second end of the capacitor is connected to a second end of the load; a first switch component, wherein a first end of the first switch component is connected to a second end of the capacitor, and a second end of the first switch component is connected to a second end of the power supply device; a second switch component, wherein a first end of the second switch component is connected to a second end of the capacitor, and a second end of the second switch component is connected to a second end of the power supply device; a third switch component, wherein a first end of the third switch component is connected to a first end of the power supply device; a fourth switch component, wherein a first end of the fourth switch component is connected to a second end of the third switch component, and a second end of the fourth switch component is connected to a second end of the power supply device; A driving circuit connected to the control end of the fourth switch component; A detection circuit connected to the second end of the capacitor; as well as a control circuit, connecting a control end of the first switch component, a control end of the second switch component, a control end of the third switch component and the detection circuit; The driving circuit drives the fourth switch component, and the control circuit controls the operation of the first switch component, the second switch component and the third switch component according to the voltage of the second end of the capacitor detected by the detection circuit, so that the total current fed back to the second end of the power supply device is not less than a current threshold indicated by an electric power regulation requirement within a specified time, and the power consumption required to be additionally consumed is reduced.

2. The power supply control circuit for effectively saving power under the condition of achieving the specified power according to claim 1, characterized in that: The load includes a power converter.

3. The power supply control circuit for effectively saving power under the condition of achieving the specified power according to claim 1, characterized in that: The control circuit turns on the first switch component but turns off the second switch component, so that the current that flows sequentially through the capacitor and the first switch component to the second end of the power supply device is not less than the current threshold within a specified time.

4. The power supply control circuit for effectively saving power under the condition of achieving the specified power according to claim 1, characterized in that: The detection circuit detects the voltage at the second end of the capacitor and the current fed back to the second end of the power supply device, and the control circuit controls the operation of the first switch component, the second switch component and the third switch component accordingly.

5. The power supply control circuit for effectively saving power under the condition of achieving the specified power according to claim 1, characterized in that: When the control circuit determines that the current detected by the detection circuit and fed back to the second end of the power supply device is less than the current threshold within a specified time, the control circuit turns off the first switch component, the second switch component and the third switch component, and the detection circuit detects the voltage at the second end of the capacitor.

6. The power supply control circuit for effectively saving power under the condition of achieving the specified power according to claim 5, characterized in that: After the first switch component, the second switch component and the third switch component are closed for a period of time, the control circuit determines whether the voltage at the second end of the capacitor detected by the detection circuit is higher than a voltage threshold; When the voltage at the second end of the capacitor is higher than the voltage threshold, the control circuit keeps closing the second switch component and opens the first switch component or opens both the first switch component and the third switch component.

7. The power supply control circuit for effectively saving power under the condition of achieving the specified power according to claim 5, characterized in that: When the closing time length of the first switch component is greater than a closing time threshold, the control circuit turns on the first switch component, or turns on the first switch component and the third switch component.

8. The power supply control circuit for effectively saving power under the condition of achieving the specified power according to claim 1, characterized in that: When the control circuit turns off the second switch component, the control circuit turns on the first switch component.

9. The power supply control circuit for effectively saving power under the condition of achieving the specified power according to claim 1, characterized in that: When the control circuit turns on the first switch component and the third switch component for a time length greater than a maximum on-time, the control circuit turns off the first switch component and the third switch component.

10. The power supply control circuit for effectively saving power under the condition of achieving the specified power according to claim 1, characterized in that: When the detection circuit detects that the voltage at the second end of the capacitor is lower than a voltage threshold, the control circuit turns off the first switch component and the third switch component.

11. The power supply control circuit for effectively saving power under the condition of achieving the specified power according to claim 1, characterized in that: When the control circuit turns on the first switch component and the third switch component for a time length greater than a maximum on-time and the voltage at the second end of the capacitor is lower than a voltage threshold, the control circuit turns off the first switch component and the third switch component.

12. The power supply control circuit for effectively saving power under the condition of achieving the specified power according to claim 1, characterized in that: When the control circuit turns off the second switch component, the control circuit turns on the first switch component and the third switch component, and the drive circuit turns on the fourth switch component.

13. The power supply control circuit for effectively saving power under the condition of achieving the specified power according to claim 1, characterized in that: The driving circuit is connected to the second end of the first switch component, and drives the fourth switch component to operate according to the voltage of the second end of the first switch component.

14. The power supply control circuit for effectively saving power under the condition of achieving the specified power according to claim 13, characterized in that: When the driving circuit determines that the voltage at the second end of the first switch component is lower than a reference voltage, the driving circuit turns on the fourth switch component.

15. The power supply control circuit for effectively saving power under the condition of achieving the specified power according to claim 1, characterized in that: When the load is lightly loaded or unloaded, the control circuit turns off the second switch component and turns on the first switch component and the third switch component, and the drive circuit turns on the fourth switch component; Wherein, when the load is heavy, the control circuit turns on the second switch component and turns off the first switch component and the third switch component, and the drive circuit turns off the fourth switch component.

16. The power supply control circuit for effectively saving power under the condition of achieving the specified power according to claim 1, characterized in that: When the duty cycle of the current signal output from the first end of the power supply device is greater than a duty cycle threshold, the time length during which the first switch component and the third switch component are turned on is greater than a maximum conduction time, or the voltage at the second end of the capacitor is higher than a voltage threshold, the control circuit turns on the second switch component and turns off the first switch component and the third switch component, and the drive circuit turns off the fourth switch component.

17. The power supply control circuit for effectively saving power under the condition of achieving the specified power according to claim 1, characterized in that: The driving circuit comprises: A first operational amplifier, wherein a first input terminal of the first operational amplifier is coupled to a reference voltage, a second input terminal of the first operational amplifier is connected to a second terminal of the first switch component, and an output terminal of the first operational amplifier is connected to a control terminal of the fourth switch component.

18. The power supply control circuit for effectively saving power under the condition of achieving the specified power according to claim 1, characterized in that: The detection circuit comprises: A first comparator, wherein a first input terminal of the first comparator is connected to the second terminal of the capacitor, a second input terminal of the first comparator is coupled to a first voltage threshold, and an output terminal of the first comparator is connected to the control circuit.

19. The power supply control circuit for effectively saving power under the condition of achieving the specified power according to claim 18, characterized in that: The detection circuit further comprises: A second comparator, wherein a first input terminal of the second comparator is connected to the second terminal of the capacitor, a second input terminal of the second comparator is coupled to a second voltage threshold, and an output terminal of the second comparator is connected to the control circuit.

Images