Switching control circuit and switching power supply

Abstract

The utility model relates to a switching control circuit and a switching power supply. The switching control circuit comprises a switching module and a control module. The switch module is connected with the first output assembly, the first output port, the second output assembly and the second output port. The control module is connected with the switch module and used for controlling the switch module to conduct connection between the first output assembly and the second output port so that the first output signal can be transmitted through the second output port. Visibly, according to the application, different power output signals of different groups of AC-DC circuits in the same power supply design can be switched and output at different output ports through the switch module and the control module, so that the output of any group of AC-DC conversion circuits can be switched to the output of the output port of any other AC-DC conversion circuit; a DC-DC conversion circuit / module does not need to be arranged, any group transfer of output voltage, current and power of multiple groups of AC-DC conversion circuits is realized, and the overall efficiency of multi-path output of the switching power supply is improved.

Description

Technical Field

[0001] This application relates to the technical field of switching power supply circuit design, and particularly to a switching control circuit and a switching power supply. Background Art

[0002] There are very clear requirement ranges for the energy efficiency standards of switching power supplies. The energy efficiency of a switching power supply has a direct impact on the temperature of the whole machine, and the temperature has a very direct impact on the experience of end users.

[0003] In order to meet the requirements of the current mainstream multi-port application scenarios of chargers, in the case of multiple DC-DC conversion circuits in the output of a switching power supply, there is power loss during the conversion process from the front-stage AC-DC conversion circuit to the rear-stage DC-DC conversion circuit. As the number of power modules in the rear-stage DC-DC conversion circuit increases, the power loss of the whole machine increases accordingly. Therefore, the multiple DC-DC conversion circuits of the switching power supply pose a major challenge to the overall efficiency of the machine, and the energy efficiency loss poses a major challenge to both the efficient utilization of energy and the environment. Summary of the Utility Model

[0004] Based on this, in view of the above problems, it is necessary to provide a switching control circuit and a switching power supply that can reduce power loss.

[0005] In a first aspect, this application provides a switching control circuit for connecting at least a first AC-DC conversion circuit and a second AC-DC conversion circuit. The first AC-DC conversion circuit includes a first output component connected to a secondary coil and a first output port connected to the first output component; the second AC-DC conversion circuit includes a second output component connected to the secondary coil and a second output port connected to the second output component; the power of the first output signal of the first AC-DC conversion circuit is greater than the power of the second output signal of the second AC-DC conversion circuit; the switching control circuit includes:

[0006] A switch module, respectively connected to the first output component, the first output port, the second output component, and the second output port;

[0007] A control module, connected to the switch module, for controlling the switch module to conduct the connection between the first output component and the second output port when there is no power output demand at the first output port and there is a power output demand at the second output port, so that the first output signal is transmitted through the second output port.

[0008] In one of the embodiments, the control module is further configured to control the switch module to disconnect the connection between the second output component and the first output component and the second output port when there is no power output demand at the first output port and there is a power output demand at the second output port.

[0009] In one embodiment, the switch module includes:

[0010] A first switch unit, which is respectively connected to the first output component, the first output port, the second output port, and the control module;

[0011] A second switch unit, which is respectively connected to the second output component, the first switch unit, the second output port, and the control module;

[0012] The control module is configured to control the first switch unit to conduct the connection between the first output component and the second output port, and control the second switch unit to disconnect the connection between the second output component and the second output port when there is no power output requirement at the first output port and there is a power output requirement at the second output port.

[0013] In one embodiment, the second switch unit includes at least one controlled switch; when the second switch unit includes a plurality of controlled switches, the number of the second output ports is multiple, and the second switch unit includes:

[0014] A first controlled switch, the first end of the first controlled switch is connected to part of the second output ports, the second end of the first controlled switch is connected to the second output component, and the controlled end of the first controlled switch is connected to the control module;

[0015] A second controlled switch, the first end of the second controlled switch is connected to the second output component, the second end of the second controlled switch is connected to the first switch unit and the remaining second output ports, and the controlled end of the second controlled switch is connected to the control module; the remaining second output ports are the output ports among the multiple second output ports except part of the second output ports;

[0016] The control module is further configured to control the first controlled switch to conduct or turn off, and control the second controlled switch to disconnect the connection between the second output component and the first output component and the remaining second output ports when there is no power output requirement at the first output port and there is a power output requirement at the second output port.

[0017] In one embodiment, the second switch unit further includes:

[0018] A third controlled switch, the first end of the third controlled switch is connected to the first end of the first controlled switch, the second end of the third controlled switch is connected to the remaining second output ports and the second end of the second controlled switch, and the controlled end of the third controlled switch is connected to the control module;

[0019] The control module is further configured to control one of the first controlled switch and the third controlled switch to conduct and the other to disconnect when there is no power output demand at the first output port and there is a power output demand at the second output port.

[0020] In one embodiment, the second switch unit further includes:

[0021] A fourth controlled switch, a first end of the fourth controlled switch is connected to the second output port, a second end of the fourth controlled switch is connected to a second end of the second controlled switch, a controlled end of the fourth controlled switch is connected to the control module, and the fourth controlled switch is configured to disconnect a connection between the second controlled switch and the remaining second output ports under the control of the control module.

[0022] In one embodiment, the control module is further connected to a second output component, and is configured to control the second output component to operate normally or stop operating when there is no power output demand at the first output port and there is a power output demand at the second output port.

[0023] In one embodiment, the number of the second output ports is multiple; when there is no power output demand at the first output port and the power output demands of the multiple second output ports are different, the control module controls the second switch unit to conduct a connection between the second output component and some of the second output ports, and controls the second switch unit to disconnect a connection between the second output component and the remaining second output components, and controls the second output component to operate normally;

[0024] wherein, the power output demand of some of the second output ports is less than that of the remaining second output ports.

[0025] In one embodiment, the control module includes:

[0026] A first control unit, connected to the switch module, and configured to control the switch module to conduct a connection between the first output component and the second output port when there is no power output demand at the first output port and there is a power output demand at the second output port;

[0027] A second control unit, connected to the first control unit and the second output component respectively;

[0028] The first control unit is further configured to control the second control unit to control the second output component to operate normally or stop operating when there is no power output demand at the first output port and there is a power output demand at the second output port.

[0029] In one embodiment, the switch module includes:

[0030] A first switching unit, the first switching unit is respectively connected to the first output component, the first output port, the second output component, the second output port and the control module;

[0031] The control module is further connected to the second output component, and is configured to control the first switching unit to conduct the connection between the first output component and the second output port and control the second output component to stop working when there is no power output demand at the first output port and there is a power output demand at the second output port.

[0032] In one embodiment, the first switching unit includes at least one controlled switch. When the first switching unit includes two controlled switches, the first switching unit includes:

[0033] A fifth controlled switch, a first end of the fifth controlled switch is connected to the first output component and the first output port, a controlled end of the fifth controlled switch is connected to the control module, and the fifth controlled switch is conducted under the control of the control module;

[0034] A sixth controlled switch, a first end of the sixth controlled switch is connected to the second output port, a second end of the sixth controlled switch is connected to a second end of the fifth controlled switch, and the sixth controlled switch is conducted under the control of the control module.

[0035] In a second aspect, the present application further provides a switching power supply, including:

[0036] An AC-DC conversion module, at least including a first AC-DC conversion circuit and a second AC-DC conversion circuit;

[0037] The switching control circuit as described above is respectively connected to the first AC-DC conversion circuit and the second AC-DC conversion circuit to output the output signal of the first AC-DC conversion circuit through the second output port of the second AC-DC conversion circuit.

[0038] The above switching control circuit and switching power supply, the switching control circuit is used to connect at least a first AC-DC conversion circuit and a second AC-DC conversion circuit. The first AC-DC conversion circuit includes a first output component connected to the secondary coil and a first output port connected to the first output component; the second AC-DC conversion circuit includes a second output component connected to the secondary coil and a second output port connected to the first output component; the electrical performance parameters of the first output signal of the first AC-DC conversion circuit and the second output signal of the second AC-DC conversion circuit are different; the switching control circuit includes a switching module and a control module. The switching module is respectively connected to the first output component, the first output port, the second output component and the second output port; the control module is connected to the switching module and is used to control the switching module to conduct the connection between the first output component and the second output port, so that the first output signal is transmitted through the second output port. It can be seen that in the present application, through the switching module and the control module, the output signals with different powers of different groups of AC-DC circuits in the same power supply design can be switched and output at different output ports, achieving that the output of any one group of AC-DC conversion circuits can be switched to the output port of any other AC-DC conversion circuit, without setting a DC-DC conversion circuit / module, realizing the arbitrary transfer of the output voltage, current and power of multiple groups of AC-DC conversion circuits, and improving the overall efficiency of the multi-output switching power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings required to be used in the description of the embodiments of the present application or related technologies. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0040] Figure 1 FIG. 1 is a schematic structural diagram of a switching control circuit according to an embodiment of the present application;

[0041] Figure 2 FIG. 2 is a schematic structural diagram of a switching module according to an embodiment of the present application;

[0042] Figure 3 FIG. 3 is a schematic structural diagram of a second switching unit according to an embodiment of the present application;

[0043] Figure 4 FIG. 4 is a schematic structural diagram of a second switching unit according to another embodiment of the present application;

[0044] Figure 5 FIG. 5 is a schematic structural diagram of a second switching unit according to yet another embodiment of the present application;

[0045] Figure 6The second structural schematic diagram of the switching control circuit in an embodiment of the present application;

[0046] Figure 7 The structural schematic diagram of the control module in an embodiment of the present application;

[0047] Figure 8 The second structural schematic diagram of the switch module in an embodiment of the present application;

[0048] Figure 9 The structural schematic diagram of the first switch unit in an embodiment of the present application;

[0049] Figure 10 The third structural schematic diagram of the switching control circuit in an embodiment of the present application;

[0050] Figure 11 The fourth structural schematic diagram of the switching control circuit in an embodiment of the present application;

[0051] Figure 12 The fifth structural schematic diagram of the switching control circuit in an embodiment of the present application.

[0052] Explanation of the reference numerals in the attached drawings:

[0053] Switching control circuit: 100; Switch module: 110; First switch unit: 111; Fifth controlled switch: 1111; Sixth controlled switch: 1112; Second switch unit: 112; First controlled switch: 1121; Second controlled switch: 1122; Third controlled switch: 1123; Fourth controlled switch: 1124; Control module: 120; First control unit: 121; Second control unit: 122; On-off logic control unit: 1211; Rectification control unit: 1221; First AC-DC conversion circuit: 210; First output component: 211; First output port: 212; Second AC-DC conversion circuit: 220; Second output component: 221; Second output port: 222. Detailed implementation manners

[0054] To make the above objects, features, and advantages of the present application more obvious and understandable, the following will describe the detailed implementation manners of the present application in conjunction with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0055] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0056] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0057] In the present application, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0058] The switching control circuit 100 in the present application is applied to multiple groups of AC-DC conversion circuit scenarios. The electrical performance parameters (such as voltage, current, power, etc.) of the output signals of multiple groups of AC-DC conversion circuits are different, and it can achieve free switching on the output ports of each group of AC-DC conversion circuits without using a DC-DC conversion circuit / module. It should be noted that the structure of the AC-DC conversion circuit is not specifically limited in the present application and can be any structure that can be applied to the switching control circuit 100 of the present application. In this embodiment, the example where the power of the first output signal is different from the power of the second output signal is used for explanation. Exemplarily, refer to the attached Figure 1 , attached Figure 1The schematic diagram of the switching control circuit 100 of the present application connected to at least two AC-DC conversion circuits (i.e., the first AC-DC conversion circuit 210 and the second AC-DC conversion circuit 220) is shown, where both the first AC-DC conversion circuit 210 and the second AC-DC conversion circuit 220 include an output component and at least one output port. Exemplarily, the output component may include a rectifier and a filter. The secondary coil Ns of each AC-DC conversion circuit is connected to at least one output port (attached Figure 1 The case where the first AC-DC conversion circuit 210 includes one output port and the second AC-DC conversion circuit 220 includes three output ports is shown. In the present application, the first AC-DC conversion circuit 210 includes a first output component 211 and a first output port 212, and the second AC-DC conversion circuit 220 includes a second output component 221 and a second output port 222 as an example for illustration. Among them, the first output port 212 and the second output port 222 may refer to simple power supply output ports, or control circuits including power supply output ports and protocol chips, and are not limited thereto.

[0059] In addition, attached Figure 1 The case where the primary coil Np of the first AC-DC conversion circuit 210 is connected to an input component is shown, where the input component includes AC input rectification, an EMI filter, and a storage capacitor. The AC input rectification is connected to the EMI filter, the EMI filter is connected to the storage capacitor, and the storage capacitor is connected to the primary coil Np. In other embodiments, the input component may also be other structures and is not limited to the above examples. Attached Figure 1 The case where the first AC-DC conversion circuit 210 and the second AC-DC conversion circuit 220 share an input component is shown. In other embodiments, the first AC-DC conversion circuit 210 and the second AC-DC conversion circuit 220 may also be independently connected to input components of the same structure or different structures. For example, the primary coil of the first AC-DC conversion circuit 210 is connected to the first input component, and the second AC-DC conversion circuit 220 is connected to the second input component. The structures of the first input component and the second input component are the same or different, and are not limited thereto.

[0060] In one embodiment, continue to refer to attached Figure 1, the switching control circuit 100 in the present application includes a switch module 110 and a control module 120. The switch module 110 is respectively connected to a first output component 211, a first output port 212, a second output component 221, and a second output port 222. The control module 120 is connected to the switch module 110 and is configured to control the switch module 110 to conduct the connection between the first output component 211 and the second output port 222 when there is no power output requirement at the first output port 212 and there is a power output requirement at the second output port 222, so that the first output signal is transmitted through the second output port 222.

[0061] Among them, the switch module 110 refers to a module or component that has two states of conduction and cut-off, or can further have a circuit protection function (such as anti-backflow). Exemplarily, it can be at least one controlled switch. When the switch module 110 includes one controlled switch, it conducts or disconnects under the control of the control module 120. In this embodiment, the switch module 110 is mainly used to control the output port transfer between two AC-DC conversion circuits. When the switch module 110 is in the conduction state, the output port of the second AC-DC conversion circuit 220 is conducted with the first AC-DC conversion circuit 210 at this time. Since the electrical performance parameters of the output signals of the first AC-DC conversion circuit 210 and the second AC-DC conversion circuit 220 are different, the output port can be switched according to any connected AC-DC conversion circuit, so that the output of any one of the AC-DC conversion circuits can be switched to the output port of any other AC-DC conversion circuit, realizing the arbitrary transfer of the output voltage, current, and power of multiple groups of AC-DC conversion circuits, and improving the overall efficiency of the multi-output switch power supply. When the switch module 110 includes two controlled switches, taking two controlled switches as MOS transistors as an example, the two MOS transistors can be connected back-to-back, that is, the source electrode of one MOS transistor is connected to the drain electrode of the other MOS transistor, and at the same time their gates (G) are connected together. This connection method can prevent current backflow because when the current tries to flow in the reverse direction, one of the MOS transistors will turn off, thus preventing the current from flowing. In other embodiments, the two MOS transistors can also be connected in series, where the source electrode (S) of one MOS transistor is connected to the drain electrode (D) of the other MOS transistor. This connection method can also effectively prevent current backflow. When the current tries to flow in the reverse direction, one of the MOS transistors will turn off, thus preventing the current from flowing.

[0062] In addition, when the switch module 110 is turned on under the control of the control module 120, if the first output signal is transmitted to the second AC-DC conversion circuit, and if the line between the secondary coil of the second AC-DC conversion circuit and the second output port 222 is conductive, then the first output signal will be transmitted to the secondary coil of the second AC-DC conversion circuit, causing the second AC-DC conversion circuit to malfunction and be damaged. Therefore, when the control module 120 is about to control the switch module 110 to turn on, it can control the output components (such as rectifiers and / or filters) in the second AC-DC conversion circuit to stop working in advance or simultaneously, so as to disconnect the connection between the first output component 211 and the secondary coil of the second AC-DC conversion circuit 220, and avoid the output current of the first AC-DC conversion circuit 220 from flowing back into the secondary coil of the second AC-DC conversion circuit 220, which affects the second AC-DC conversion circuit 220. In addition, the connection between the second output component 221 and the first output component 211 and the second output port 222 can also be disconnected by controlling the switch module 110. The switch module 110 cuts off the connection between the first output component 211 and the second output component 221 and the connection between the second output component 221 and the second output port 222 connected to the first output component 211. At this time, regardless of whether the second output component 221 works normally, the first output signal can be prevented from flowing back into the second AC-DC conversion circuit 220.

[0063] It should be noted that the logical operation of the control module 120 is not limited in this embodiment. The control module 120 in this embodiment can be any logical arithmetic unit that can achieve the above working purpose. That is, those skilled in the art can flexibly set under what conditions the control module 120 controls the on-off state of the switch module 110 according to actual needs. Exemplarily, when the control module 120 is also connected to the detection module, when receiving the detection signal output by the detection module, the switch module 110 is controlled to turn on, and at the same time, the output is controlled to stop working or the switch module 110 is controlled to turn on the connection between the first output component 211 and the second output port 222, and at the same time, the switch module 110 is controlled to disconnect the connection between the second output component 221 and the first output component 211 and the second output port 222. The detection module can be an electronic component for detecting whether an electrical device is inserted into the output port of the second AC-DC conversion circuit 220 and detecting the power supply requirements of the inserted electrical device (such as power supply time, power supply voltage, power supply current or power supply power, etc.). Based on this, the switching control circuit 100 of the present application can also realize the transfer of single-port blind plug power to other ports, and is not limited thereto.

[0064] In this embodiment, through the switch module 110 and the control module 120, it is possible to make the output signals with different powers of different groups of AC-DC circuits in the same power supply design switch and output at different output ports, so that the output of any one group of AC-DC conversion circuits can be switched to the output port of any other AC-DC conversion circuit, without setting up a DC-DC conversion circuit / module, realizing the arbitrary transfer of the output voltage, current, and power of multiple groups of AC-DC conversion circuits, and improving the overall efficiency of the multi-output switch power supply.

[0065] In one embodiment, the control module is further configured to control the switch module to disconnect the connection between the second output component and the first output component and the second output port when there is no power output requirement at the first output port and there is a power output requirement at the second output port.

[0066] In this embodiment, when the control module controls the switch module to conduct the connection between the first output component and the second output port, and at the same time controls the switch module to disconnect the connection between the second output component and the first output component and the second output port, it can effectively prevent the first output signal from flowing back to the second AC-DC conversion circuit and affecting the second AC-DC conversion circuit.

[0067] In one embodiment, refer to the appendix Figure 2 , appendix Figure 2 shows one of the structural schematic diagrams of the switch module 110 in this embodiment; in order to highlight the structure of the switch module 110 in this embodiment, appendix Figure 2 only shows the first output component 211 and the first output port 212 in the first AC-DC conversion circuit 210, and the second output component 221 and the second output port 222 in the second AC-DC conversion circuit 220, and other structures in the first and second AC-DC conversion circuits are not shown. The switch module 110 in this embodiment includes a first switch unit 111 and a second switch unit 112. The first switch unit 111 is respectively connected to the first output component 211, the first output port 212, the second output port 222, and the control module 120; the second switch unit 112 is respectively connected to the second output component 221, the first switch unit 111, the second output port 222, and the control module 120; the control module 120 is configured to control the first switch unit 111 to conduct the connection between the first output component 211 and the second output port 222, and control the second switch unit 112 to disconnect the connection between the second output component 221 and the second output port 222 when there is no power output requirement at the first output port 212 and there is a power output requirement at the second output port 222.

[0068] The first switch unit 111 and the second switch unit 112 each include at least one controlled switch. The first switch unit 111 mainly controls the connection between the first output component 211 and the second output port 222. The second switch unit 112 mainly controls the connection between the second output component 221, the first output component 211, and the second output port 222. The control module 120 can independently control the first switch unit 111 and the second switch unit 112, and can ensure that when the first switch unit 111 conducts the connection between the first output component 211 and the second output port 222, the second switch unit 112 is controlled to disconnect the connection between the second output component 221, the first output component 211, and the second output port 222, so as to prevent the first output signal from flowing back to the second AC-DC conversion circuit.

[0069] In one embodiment, the second switch unit includes at least one controlled switch; exemplarily, when the second switch unit includes only one controlled switch, under the action of the control module, the controlled switch only realizes disconnecting the connection between the second output component and the second output port and the first output component, so that the first output signal is transmitted through the second output port, and at this time, the second output port does not transmit the second output signal.

[0070] Another exemplarily, refer to the appendix Figure 3 , the appendix Figure 3 shows one of the structural schematic diagrams of the second switch unit in this embodiment. In order to highlight the structure of the second switch unit 112 in this embodiment, the appendix Figure 3 only shows the first output component 211 and the first output port 212 in the first AC-DC conversion circuit 210, the second output component 221 and the second output port 222 in the second AC-DC conversion circuit 220, and other structures in the first and second AC-DC conversion circuits are not shown. When the second switch unit 112 in this embodiment includes a plurality of controlled switches, the number of the second output ports 222 is multiple (appendix Figure 3(The case where the number of the second output ports 222 is three is shown). The second switch unit 112 includes a first controlled switch 1121 and a second controlled switch 1122. The first end of the first controlled switch 1121 is connected to a part of the second output ports 222, the second end of the first controlled switch 1121 is connected to the second output component 221, and the controlled end of the first controlled switch 1121 is connected to the control module 120. The first end of the second controlled switch 1122 is connected to the second output component 221, the second end of the second controlled switch 1122 is connected to the first switch unit 111 and the remaining second output ports 222, and the controlled end of the second controlled switch 1122 is connected to the control module 120. The remaining second output ports 222 are the output ports among the multiple second output ports 222 except for the part of the second output ports 222. The control module 120 is further configured to control the first controlled switch 1121 to be turned on or off, and control the second controlled switch 1122 to disconnect the connection between the second output component 221 and the first output component 211 and the remaining second output ports 222 when there is no power output demand at the first output port 212 and there is a power output demand at the second output port 222.

[0071] Wherein, the controlled switch in the present application can be any controlled switch element. Exemplarily, it can be a MOS transistor, a triode, a relay, etc. Taking the MOS transistor as an example, the first end of the controlled switch refers to the source electrode of the MOS transistor, the second end of the controlled switch refers to the drain electrode of the MOS transistor, and the controlled end of the controlled switch refers to the gate electrode of the MOS transistor.

[0072] Specifically, when there is no power output demand at the first output port 212 and there is a power output demand at the second output port 222, when the control module 120 controls the first controlled switch 1121 to be turned on and controls the second controlled switch 1122 to be turned off, it means that at this time the second output component 221 is connected to a part of the second output ports 222, and the part of the second output ports 222 can transmit the second output signal. The first output component 211 is connected to the remaining second output ports 222, and the remaining second output ports 222 can transmit the first output signal. At this time, the second output port 222 can transmit the first output signal and the second output signal simultaneously, improving the applicability of the switching control circuit 100.

[0073] When there is no power output demand at the first output port 212 and there is a power output demand at the second output port 222, if the control module 120 controls the first controlled switch 1121 to be turned off and controls the second controlled switch 1122 to be turned off, it means that at this time the connections between the second output component 221 and all the second output ports 222 are all disconnected, and at this time only the remaining second output ports 222 are called to transmit the first output signal.

[0074] In one embodiment, refer to the appendix Figure 4 , appendix Figure 4FIG. 2 shows a second schematic structural diagram of the second switch unit 112 in this embodiment. To highlight the structure of the second switch unit 112 in this embodiment, the appended Figure 4 figure only shows the first output component 211 and the first output port 212 in the first AC-DC conversion circuit 210, and the second output component 221 and the second output port 222 in the second AC-DC conversion circuit 220. Other structures in the first and second AC-DC conversion circuits are not shown. The second switch unit 112 in this embodiment further includes a third controlled switch 1123. The first end of the third controlled switch 1123 is connected to the first end of the first controlled switch 1121. The second end of the third controlled switch 1123 is connected to the remaining second output port 222 and the second end of the second controlled switch 1122. The controlled end of the third controlled switch 1123 is connected to the control module 120. The control module 120 is further configured to control one of the first controlled switch 1121 and the third controlled switch 1123 to conduct and the other to disconnect when there is no power output requirement at the first output port 212 and there is a power output requirement at the second output port 222.

[0075] In this embodiment, based on the first controlled switch 1121 and the second controlled switch 1122, a third controlled switch 1123 is further provided. When the control module 120 controls the second controlled switch 1122 to disconnect, it controls one of the first controlled switch 1121 and the third controlled switch 1123 to conduct and the other to turn off, so that when the second output signal does not need to be transmitted, the first output signal can be transmitted through all the second output ports 222. When the second output signal needs to be transmitted, it ensures that the first output signal is transmitted through at least one second output port 222. Specifically, when the control module 120 controls the second controlled switch 1122 to disconnect, the first controlled switch 1121 to conduct, and the third controlled switch 1123 to turn off, at this time, some of the second output ports 222 transmit the second output signal, and the remaining output ports transmit the first output signal. The second output ports 222 can transmit the first output signal and the second output signal simultaneously. When the control module 120 controls the second controlled switch 1122 to disconnect, the first controlled switch 1121 to disconnect, and the third controlled switch 1123 to conduct, the first output signal can be transmitted through any second output port 222, and at this time, the second output ports 222 do not transmit the second output signal.

[0076] In one embodiment, referring to the appended Figure 5 figure, the appended Figure 5 FIG. 3 shows a third schematic structural diagram of the second switch unit 112 in this embodiment. To highlight the structure of the second switch unit 112 in this embodiment, the appended Figure 5Only the first output component 211 and the first output port 212 in the first AC-DC conversion circuit 210, and the second output component 221 and the second output port 222 in the second AC-DC conversion circuit 220 are shown. Other structures in the first and second AC-DC conversion circuits are not shown. The second switch unit 112 in this embodiment further includes a fourth controlled switch 1124. The first end of the fourth controlled switch 1124 is connected to the second output port 222, the second end of the fourth controlled switch 1124 is connected to the second end of the second controlled switch 1122, and the controlled end of the fourth controlled switch 1124 is connected to the control module 120. The fourth controlled switch 1124 is used to disconnect the connection between the second controlled switch 1122 and the remaining second output port 222 under the control of the control module 120.

[0077] In this embodiment, while the second controlled switch 1122 is provided, a fourth controlled switch 1124 is additionally provided. The fourth controlled switch 1124 and the second controlled switch 1122 are connected back to back. That is, when both the first controlled switch 1121 and the fourth controlled switch 1124 are MOS transistors, the source electrode of one MOS transistor is connected to the drain electrode of the other MOS transistor, and at the same time, their gates (G) are connected together and are both connected to the control module 120. When current attempts to flow in the reverse direction, one of the MOS transistors will turn off, thereby preventing the current from flowing and preventing current backflow.

[0078] It can be understood that in other embodiments, the fourth controlled switch 1124 can also be connected in series with the second controlled switch 1122. For example, the first end of the fourth controlled switch 1124 is connected to the second end of the second controlled switch 1122, the second end of the fourth controlled switch 1124 is connected to the second output port 222, and the controlled end of the fourth controlled switch 1124 is connected to the control module 120. At this time, the purpose of preventing current backflow can also be achieved.

[0079] In one embodiment, refer to the appendix Figure 6 , appendix Figure 6 shows the second schematic diagram of the structure of the switching control circuit in this embodiment. To highlight the structure of the switching control circuit 100 in this embodiment, appendix Figure 6 only shows the first output component 211 and the first output port 212 in the first AC-DC conversion circuit 210, and the second output component 221 and the second output port 222 in the second AC-DC conversion circuit 220. Other structures in the first and second AC-DC conversion circuits are not shown. The control module 120 in this embodiment is also connected to the second output component 221, and is used to control the second output component 221 to work normally or stop working when there is no power output requirement at the first output port 212 and there is a power output requirement at the second output port 222.

[0080] In this embodiment, when the control module 120 controls the second output component 221 to stop working, it means that the second output port 222 does not transmit the second output signal at this time and is only used to support the transmission of the first output signal. When the control module 120 controls the second output component 221 to work normally, when the second controlled switch 1122 is disconnected, the second output port 222 connected to the second controlled switch 1122 can also support the transmission of the first output signal. When the first controlled switch 1121 is turned on, a part of the second output ports 222 connected to the first controlled switch 1121 can also support the transmission of the second output signal.

[0081] In one embodiment, the number of second output ports is multiple; when the first output port has no power output requirement and the power output requirements of the multiple second output ports are different, the control module controls the second switch unit to turn on the connection between the second output component and a part of the second output ports, and controls the second switch unit to disconnect the connection between the second output component and the remaining second output components, and controls the second output component to work normally; wherein, the power output requirement of a part of the second output ports is less than the power output requirement of the remaining second output ports.

[0082] When the first output port has no power output requirement, and the second output port has a power output requirement, and the number of second output ports is multiple, there are situations where the power output requirements of multiple output ports are different. Since the power of the first output signal is greater than the power of the second output signal, it is necessary to accurately control the first output signal / second output signal to match the output requirements of the multiple second output ports. For example, the first output signal can be transmitted through the second output port with a larger power output requirement, and the control second output signal can be transmitted through the second output port with a smaller power output requirement. Based on this, in this embodiment, when the power output requirements of the multiple second output ports are different, the control second switch unit turns on the connection between the second output component and a part of the second output ports, and controls the second switch unit to disconnect the connection between the second output component and the remaining second output components, and controls the second output component to work normally, so that the first AC-DC conversion circuit can output the first output signal to the remaining second output ports and the second AC-DC conversion circuit can output the second output signal to a part of the second output ports. At this time, the output requirement of the remaining second output ports should be greater than the power output requirement of a part of the second output ports, that is, the power output requirement of a part of the second output ports is less than the output requirement of the remaining second output ports.

[0083] In addition, when there are power output requirements at both the first output port and the second output port, the control module controls the first switch unit to disconnect the connection between the first output component and the second output component and the second output port, and controls the second switch unit to conduct the connection between the second output component and the second output port, and controls the second output component to work properly. At this time, the first output port transmits the first output signal of the first AC-DC conversion circuit, and the second output port transmits the second output signal of the second AC-DC conversion circuit. At this time, the number of second output ports can be one or more.

[0084] In one embodiment, referring to the attached Figure 7 , the attached Figure 7 shows a schematic structural diagram of the control module 120 in this embodiment. To highlight the structure of the control module 120 in this embodiment, the attached Figure 7 only shows the first output component 211 and the first output port 212 in the first AC-DC conversion circuit 210, and the second output component 221 and the second output port 222 in the second AC-DC conversion circuit 220. Other structures in the first and second AC-DC conversion circuits are not shown. The control module 120 in this embodiment includes a first control unit 121 and a second control unit 122. The first control unit 121 is connected to the switch module 110 and is used to control the switch module 110 to conduct the connection between the first output component 211 and the second output port 222 when there is no power output requirement at the first output port 212 and there is a power output requirement at the second output port 222; the second control unit 122 is respectively connected to the first control unit 121 and the second output component 221; the first control unit 121 is further used to control the second control unit 122 to control the second output component 221 to work properly or stop working when there is no power output requirement at the first output port 212 and there is a power output requirement at the second output port 222.

[0085] Among them, the first control unit 121 can be a controller capable of performing logical operations such as an MCU (Microcontroller Unit), a single-chip microcomputer, etc. The second control unit 122 can be flexibly set according to the structure of the output component. For example, when the output component includes a rectifier and a filter, it can be a rectifier controller or a filter controller. Exemplarily, if it is a rectifier controller, it can be a PR (Proportional Resonant) controller, a PI (Proportional Integral) controller, etc., and is not limited thereto. In this embodiment, the first control unit 121 and the second control unit 122 can respectively control the on-off of the switch module 110 and the working state of the second output component 221.

[0086] In one embodiment, referring to the attached Figure 8 , the attached Figure 8FIG. 2 shows the second structural schematic diagram of the switch module 110 in this embodiment. To highlight the structure of the switch module 110 in this embodiment, the appendix Figure 8 only shows the first output component 211 and the first output port 212 in the first AC-DC conversion circuit 210, and the second output component 221 and the second output port 222 in the second AC-DC conversion circuit 220. Other structures in the first and second AC-DC conversion circuits are not shown. The switch module 110 in this embodiment only includes a first switch unit 111. The first switch unit 111 is respectively connected to the first output component 211, the first output port 212, the second output component 221, the second output port 222, and the control module 120. The control module 120 is also connected to the second output component 221 and is configured to control the first switch unit 111 to conduct the connection between the first output component 211 and the second output port 222 and control the second output component 221 to stop working when there is no power output requirement at the first output port 212 and there is a power output requirement at the second output port 222.

[0087] In this embodiment, only the first switch unit 111 is provided to control the conduction of the connection between the first output component 211 and the second output port 222, so as to realize the transmission of the first output signal through the second output port 222. To prevent current backflow to the second AC-DC conversion circuit, the control module 120 controls the second output component 221 to stop working while controlling the first switch unit 111 to conduct, such as controlling the rectifier and / or filter in the output component to stop working, which can ensure the safety of the circuit.

[0088] In one embodiment, the first switch unit 111 in this embodiment includes at least one controlled switch. When the first switch unit 111 includes two controlled switches, refer to the appendix Figure 9 appendix Figure 9 FIG. 3 shows the structural schematic diagram of the first switch unit in this embodiment. To highlight the structure of the first switch unit 111 in this embodiment, the appendix Figure 9Only the first output component 211 and the first output port 212 in the first AC-DC conversion circuit 210, and the second output component 221 and the second output port 222 in the second AC-DC conversion circuit 220 are shown, and other structures in the first and second AC-DC conversion circuits are not shown. The first switch unit 111 in this embodiment includes a fifth controlled switch 1111 and a sixth controlled switch 1112. The first end of the fifth controlled switch 1111 is connected to the first output component 211 and the first output port 212, the controlled end of the fifth controlled switch 1111 is connected to the control module 120, and the fifth controlled switch 1111 is turned on under the control of the control module 120; the first end of the sixth controlled switch 1112 is connected to the second output port 222, the second end of the sixth controlled switch 1112 is connected to the second end of the fifth controlled switch 1111, and the sixth controlled switch 1112 is turned on under the control of the control module 120.

[0089] Among them, the fifth controlled switch 1111 and the sixth controlled switch 1112 are the same as the other controlled switches in this application, and can be any controlled switch element such as a MOS transistor, a triode, a relay, etc. When it is a MOS transistor, the first end of the controlled switch is the source electrode of the MOS transistor, the second end of the controlled switch is the drain electrode of the MOS transistor, and the controlled end of the controlled switch is the gate electrode of the MOS transistor. In this embodiment, the first switch unit 111 is set as two controlled switches, and the two controlled switches are connected back to back, which can prevent current backflow and improve the circuit stability.

[0090] In one embodiment, refer to the appendix Figure 10 , appendix Figure 10FIG. 3 shows the third structural schematic diagram of the switching control circuit 100 in this embodiment. The switching control circuit 100 in this embodiment includes an on-off logic control unit 1211, a rectification control unit 1221, and MOS transistors Q1 to Q3. The gates of the MOS transistors Q1 to Q3 are all connected to the on-off logic control unit 1211. The source of the MOS transistor Q1 is connected to the filter and the first output port 212 of the first AC-DC conversion circuit 210. The drain of the MOS transistor Q1 is connected to the drain of the MOS transistor Q2. The source of the MOS transistor Q2 is connected to the drain of the MOS transistor Q3 and to the second output ports 222#1, 222#2, and 222#3 connected to the drain of the second MOS transistor Q3. The source of the MOS transistor Q3 is connected to the filter in the second AC-DC conversion circuit 220. Among them, when there is no power output requirement at the first output port 212 and there is a power output requirement at the second output port 222, the on-off logic control unit 1211 controls the MOS transistor Q1 and the MOS transistor Q2 to conduct, and controls the MOS transistor Q3 to turn off. The on-off logic control unit 1211 is connected to the rectification control unit 1221, and the rectification control unit 1221 is connected to the rectifier in the second AC-DC conversion circuit 220. The on-off logic control unit 1211 also controls the rectification control unit 1221 to control the rectifier in the second AC-DC conversion circuit 220 to stop working when there is no power output requirement at the first output port 212 and there is a power output requirement at the second output port 222, so that the connections between the second output ports 222#1 to 222#3 and the filter of the first AC-DC conversion circuit are all conducted, so that the second output ports 222#1 to 222#3 can all transmit the first output signal.

[0091] Among them, the MOS transistor Q1 is equivalent to the fifth controlled switch in the above embodiment, the MOS transistor Q2 is equivalent to the sixth controlled switch in the above embodiment, the MOS transistor Q3 is equivalent to the second controlled switch above, the on-off logic control unit 1211 is equivalent to the first control unit in the above embodiment, and the rectification control unit 1221 is equivalent to the second control unit in the above embodiment. The corresponding functions are the same as those in the above embodiment and will not be elaborated here.

[0092] In one embodiment, refer to the appendix Figure 11 , appendix Figure 11Fig. 4 shows the schematic structure of the switching control circuit 100 in this embodiment. The switching control circuit 100 in this embodiment includes an on-off logic control unit 1211, a rectification control unit 1221, and MOS transistors Q1 to Q5. The gates of the MOS transistors Q1 to Q5 are all connected to the on-off logic control unit 1211. The source of the MOS transistor Q1 is connected to the filter and the first output port 212 of the first AC-DC conversion circuit 210. The drain of the MOS transistor Q1 is connected to the drain of the MOS transistor Q2. The source of the MOS transistor Q2 is connected to the drain of the MOS transistor Q3 and the second output port 222#1 in the second AC-DC conversion circuit 220. The source of the MOS transistor Q3 is connected to the filter in the second AC-DC conversion circuit 220. The source of the MOS transistor Q4 is connected to the second output port 222#2, the second output port 222#3 in the second AC-DC conversion circuit 220, and the source of the MOS transistor Q5. The drain of the MOS transistor Q4 is connected to the second output port 222#1 of the second AC-DC conversion circuit 220 and the source of the MOS transistor Q2. The drain of the MOS transistor Q5 is connected to the filter of the second AC-DC conversion circuit 220 and the source of the MOS transistor Q3. The on-off logic control unit 1211 is connected to the rectification control unit 1221, and the rectification control unit 1221 is connected to the rectifier in the second AC-DC conversion circuit 220. When there is no power output requirement at the first output port 212 and there is a power output requirement at the second output port 222, the on-off logic control unit 1211 controls the MOS transistors Q1 and Q2 to conduct, controls the MOS transistors Q3 and Q4 to turn off, and controls the MOS transistor Q5 to conduct. At the same time, when there is no power output requirement at the first output port 212 and there is a power output requirement at the second output port 222, the rectification control unit 1221 is controlled to make the rectifier in the second AC-DC conversion circuit 220 work normally, so that the connection between the second output port #1 and the filter of the first AC-DC conversion circuit is conducted, so that the second output port 222#1 can transmit the first output signal. At the same time, the connection between the second output port 222#2 and the second output port 222#3 and the filter of the second AC-DC conversion circuit is conducted, so that the second output port 222#2 and the second output port 222#3 can transmit the second output signal simultaneously.

[0093] Among them, the MOS transistor Q1 is equivalent to the fifth controlled switch in the above embodiment, the MOS transistor Q2 is equivalent to the sixth controlled switch in the above embodiment, the MOS transistor Q3 is equivalent to the second controlled switch above, the MOS transistor Q4 is equivalent to the third controlled switch in the above embodiment, the MOS transistor Q5 is equivalent to the first controlled switch in the above embodiment, the on-off logic control unit 1211 is equivalent to the first control unit in the above embodiment, and the rectification control unit 1221 is equivalent to the second control unit in the above embodiment. The corresponding functions are the same as those in the above embodiment and will not be elaborated here.

[0094] In one embodiment, referring to the appended Figure 12 drawing Figure 12 FIG. 5 shows a schematic structural diagram of the switching control circuit 100 in this embodiment. The switching control circuit 100 in this embodiment includes an on-off logic control unit 1211, a rectification control unit 1221, MOS transistors Q1 to Q3, and MOS transistors Q5 to Q6. The gates of the MOS transistors Q1 to Q3 and the MOS transistors Q5 to Q6 are all connected to the on-off logic control unit 1211. The source of the MOS transistor Q1 is connected to the filter and the first output port 212 of the first AC-DC conversion circuit 210. The drain of the MOS transistor Q1 is connected to the drain of the MOS transistor Q2. The source of the MOS transistor Q2 is connected to the source of the MOS transistor Q6 and the second output port 222#1 in the second AC-DC conversion circuit 220. The source of the MOS transistor Q3 is connected to the filter in the second AC-DC conversion circuit 220. The drain of the MOS transistor Q3 is connected to the drain of the MOS transistor Q6. The source of the MOS transistor Q5 is connected to the second output port 222#2 and the second output port #3 in the second AC-DC conversion circuit 220. The drain of the MOS transistor Q5 is connected to the source of the MOS transistor Q3. The on-off logic control unit 1211 is connected to the rectification control unit 1221. The rectification control unit 1221 is connected to the rectifier in the second AC-DC conversion circuit 220. When there is no power output requirement at the first output port 212 and there is a power output requirement at the second output port 222, the on-off logic control unit 1211 controls the MOS transistors Q1 and Q2 to conduct, controls the MOS transistors Q3 and Q6 to turn off, and controls the MOS transistor Q5 to conduct. At the same time, when there is no power output requirement at the first output port 212 and there is a power output requirement at the second output port 222, it also controls the rectification control unit 1221 to control the rectifier in the second AC-DC conversion circuit 220 to work normally, so that the connection between the second output port 222#1 and the filter of the first AC-DC conversion circuit is conducted, so that the second output port 222#1 can transmit the first output signal. At the same time, the connection between the second output port 222#2 and the second output port 222#3 and the filter of the second AC-DC conversion circuit is conducted, so that the second output port 222#2 and the second output port 222#3 can transmit the second output signal simultaneously.

[0095] Among them, MOS transistor Q1 is equivalent to the fifth controlled switch in the above embodiment, MOS transistor Q2 is equivalent to the sixth controlled switch in the above embodiment, MOS transistor Q3 is equivalent to the second controlled switch above, MOS transistor Q5 is equivalent to the first controlled switch in the above embodiment, MOS transistor Q6 is equivalent to the fourth controlled switch in the above embodiment, the on-off logic control unit 1211 is equivalent to the first control unit in the above embodiment, and the rectification control unit 1221 is equivalent to the second control unit in the above embodiment. Their corresponding functions are the same as those in the above embodiment and will not be elaborated here.

[0096] In one embodiment, a switching power supply is further provided. The switching power supply in this embodiment includes an AC-DC conversion module and the switching control circuit in any of the above embodiments. The AC-DC conversion module at least includes a first AC-DC conversion circuit and a second AC-DC conversion circuit. The switching control circuit is respectively connected to the first AC-DC conversion circuit and the second AC-DC conversion circuit to output the output signal of the first AC-DC conversion circuit through the second output port of the second AC-DC conversion circuit.

[0097] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0098] The above embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A switching control circuit, characterized in that: Used to connect at least a first AC-DC conversion circuit and a second AC-DC conversion circuit, the first AC-DC conversion circuit includes a first output component connected to the auxiliary coil and a first output port connected to the first output component; the second AC-DC conversion circuit includes a second output component connected to the auxiliary coil and a second output port connected to the second output component; the power of the first output signal of the first AC-DC conversion circuit is greater than the power of the second output signal of the second AC-DC conversion circuit; The switching control circuit comprises: a switch module, connected to the first output component, the first output port, the second output component and the second output port respectively; The control module is connected to the switch module and is used to control the switch module to conduct the connection between the first output component and the second output port when the first output port has no power output demand and the second output port has power output demand, so that the first output signal is transmitted through the second output port.

2. The switching control circuit according to claim 1, characterized in that: The control module is further configured to control the switch module to disconnect the second output component from the first output component and the second output port when the first output port has no power output demand and the second output port has power output demand.

3. The switching control circuit according to claim 2, characterized in that: The switch module comprises: A first switch unit is connected to the first output component, the first output port, the second output port and the control module respectively; A second switch unit is connected to the second output component, the first switch unit, the second output port and the control module respectively; The control module is used to control the first switch unit to connect the first output component to the second output port, and control the second switch unit to disconnect the second output component from the second output port when the first output port has no power output demand and the second output port has power output demand.

4. The switching control circuit according to claim 3, characterized in that: The second switch unit includes at least one controlled switch; when the second switch unit includes multiple controlled switches, the number of the second output ports is multiple, and the second switch unit includes: a first controlled switch, wherein a first end of the first controlled switch is connected to a part of the second output ports, a second end of the first controlled switch is connected to the second output component, and a controlled end of the first controlled switch is connected to the control module; a second controlled switch, wherein a first end of the second controlled switch is connected to the second output component, a second end of the second controlled switch is connected to the first switch unit and the remaining second output ports, and a controlled end of the second controlled switch is connected to the control module; the remaining second output ports are output ports among the plurality of second output ports except for some of the second output ports; The control module is further configured to control the first controlled switch to be turned on or off, and to control the second controlled switch to disconnect the second output component from the first output component and the remaining second output ports when the first output port has no power output demand and the second output port has a power output demand.

5. The switching control circuit according to claim 4, characterized in that: The second switch unit further includes: a third controlled switch, wherein a first end of the third controlled switch is connected to a first end of the first controlled switch, a second end of the third controlled switch is connected to the remaining second output ports and the second end of the second controlled switch, and a controlled end of the third controlled switch is connected to the control module; The control module is further configured to control one of the first controlled switch and the third controlled switch to be turned on and the other to be turned off when the first output port has no power output demand and the second output port has power output demand.

6. The switching control circuit according to claim 4 or 5, characterized in that: The second switch unit further includes: a fourth controlled switch, wherein a first end of the fourth controlled switch is connected to the second output port, a second end of the fourth controlled switch is connected to the second end of the second controlled switch, a controlled end of the fourth controlled switch is connected to the control module, and the fourth controlled switch is used to disconnect the second controlled switch from the remaining second output ports under the control of the control module.

7. The switching control circuit according to any one of claims 3 to 5, characterized in that: The control module is also connected to the second output component, and is used to control the second output component to work normally or stop working when the first output port has no power output demand and the second output port has power output demand.

8. The switching control circuit according to claim 7, characterized in that: The number of the second output ports is multiple; when the first output port has no power output demand and the power output demands of the multiple second output ports are different, the control module controls the second switch unit to conduct the connection between the second output component and part of the second output ports, and controls the second switch unit to disconnect the connection between the second output component and the remaining second output components, and controls the second output component to work normally; The power output requirements of some of the second output ports are smaller than the power output requirements of the remaining second output ports.

9. The switching control circuit according to claim 7, characterized in that: The control module comprises: A first control unit, connected to the switch module, for controlling the switch module to conduct the connection between the first output component and the second output port when the first output port has no power output demand and the second output port has power output demand; a second control unit, connected to the first control unit and the second output component respectively; The first control unit is further configured to control the second control unit to control the second output component to work normally or stop working when the first output port has no power output demand and the second output port has power output demand.

10. The switching control circuit according to claim 1, characterized in that: The switch module comprises: A first switch unit, wherein the first switch unit is respectively connected to the first output component, the first output port, the second output component, the second output port and the control module; The control module is also connected to the second output component, and is used to control the first switch unit to conduct the connection between the first output component and the second output port while controlling the second output component to stop working when the first output port has no power output demand and the second output port has power output demand.

11. The switching control circuit according to claim 3 or 10, characterized in that: The first switch unit includes at least one controlled switch. When the first switch unit includes two controlled switches, the first switch unit includes: a fifth controlled switch, wherein a first end of the fifth controlled switch is connected to the first output component and the first output port, a controlled end of the fifth controlled switch is connected to the control module, and the fifth controlled switch is turned on under the control of the control module; a sixth controlled switch, wherein a first end of the sixth controlled switch is connected to the second output port, a second end of the sixth controlled switch is connected to the second end of the fifth controlled switch, and the sixth controlled switch is turned on under the control of the control module.

12. A switching power supply, characterized in that: include: The AC-DC conversion module comprises at least a first AC-DC conversion circuit and a second AC-DC conversion circuit; The switching control circuit according to any one of claims 1 to 11, connected to the first AC-DC conversion circuit and the second AC-DC conversion circuit, respectively, so as to output the output signal of the first AC-DC conversion circuit through the second output port of the second AC-DC conversion circuit.

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