Switching control circuit and switching power supply

Abstract

The invention 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] The present application relates to the technical field of switching power supply circuit design, and in particular to a switching control circuit and a switching power supply. Background Art

[0002] The energy efficiency standards for switching power supplies have very clear requirements and regulations. The energy efficiency of switching power supplies has a direct impact on the temperature of the entire machine, and the temperature has a very direct impact on the experience of end users.

[0003] In order to meet the needs of the current mainstream charging head multi-port application scenarios, when the switching power supply output has multiple DC-DC conversion circuits, there is power loss in 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 multi-channel DC-DC conversion circuit output of the switching power supply poses a major challenge to the efficiency of the whole machine, and the energy efficiency loss poses a major challenge to the efficient utilization of energy and the environment. Summary of the invention

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

[0005] In a first aspect, the present application provides a switching control circuit for connecting at least a first AC-DC conversion circuit and a second AC-DC conversion circuit, wherein 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 a first output signal of the first AC-DC conversion circuit is greater than the power of a second output signal of the second AC-DC conversion circuit; the switching control circuit includes:

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

[0007] 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.

[0008] In one embodiment, 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.

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

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

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

[0012] 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.

[0013] In one embodiment, 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:

[0014] 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;

[0015] 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;

[0016] The control module is also used to control the first controlled switch to be turned on or off when the first output port has no power output demand and the second output port has power output demand, and to control the second controlled switch to disconnect the second output component from the first output component and the remaining second output ports.

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

[0018] 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;

[0019] 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.

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

[0021] 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.

[0022] In one embodiment, the control module is further 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.

[0023] In one embodiment, 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;

[0024] The power output requirements of some of the second output ports are smaller than the power output requirements of the remaining second output ports.

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

[0026] 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;

[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 work normally or stop working when the first output port has no power output demand and the second output port has power output demand.

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

[0030] 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;

[0031] 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.

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

[0033] 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;

[0034] 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.

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

[0036] The AC-DC conversion module comprises at least a first AC-DC conversion circuit and a second AC-DC conversion circuit;

[0037] The switching control circuit as mentioned above is connected to the first AC-DC conversion circuit and the second AC-DC conversion circuit respectively 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 switching control circuit and the switching power supply are as follows: 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 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 first output component; the first output signal of the first AC-DC conversion circuit and the second output signal of the second AC-DC conversion circuit have different electrical performance parameters; the switching control circuit includes a switch module and a control module. The switch 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 switch module, and is used to control the switch 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, the switch module and the control module can enable the output signals of different powers of different groups of AC-DC circuits in the same power supply design to be switched and output at different output ports, so that the output of any group of AC-DC conversion circuits can be switched to the output of any other AC-DC conversion circuit output port, without setting up a DC-DC conversion circuit / module, and realizing the transfer of output voltage, current, and power of multiple groups of AC-DC conversion circuits to any group, thereby improving the overall efficiency of the switching power supply with multiple outputs. 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 drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 This is one of the structural schematic diagrams of the switching control circuit in one embodiment of the present application;

[0041] Figure 2 This is one of the structural schematic diagrams of the switch module in one embodiment of the present application;

[0042] Figure 3 This is one of the structural schematic diagrams of the second switch unit in one embodiment of the present application;

[0043] Figure 4 This is a second structural diagram of the second switch unit in one embodiment of the present application;

[0044] Figure 5 This is a third structural diagram of the second switch unit in one embodiment of the present application;

[0045] Figure 6This is a second structural diagram of a switching control circuit in an embodiment of the present application;

[0046] Figure 7 This is a schematic diagram of the structure of a control module in one embodiment of the present application;

[0047] Figure 8 This is a second structural diagram of a switch module in an embodiment of the present application;

[0048] Fig. 9 This is a schematic diagram of the structure of a first switch unit in an embodiment of the present application;

[0049] Fig.10 The third structural diagram of the switching control circuit in one embodiment of the present application;

[0050] Fig.11 This is a fourth structural diagram of a switching control circuit in an embodiment of the present application;

[0051] Fig.12 This is a fifth structural diagram of a switching control circuit in an embodiment of the present application.

[0052] Description of Figure Numbers:

[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 DESCRIPTION

[0054] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of 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 violating the connotation of the present application, so 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 terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

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

[0057] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this 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 output signal electrical performance parameters (such as voltage, current, power, etc.) of the multiple groups of AC-DC conversion circuits are different, and free switching can be achieved on the output ports of each group of AC-DC conversion circuits without using DC-DC conversion circuits / modules. It should be noted that the present application does not impose specific restrictions on the structure of the AC-DC conversion circuit, and it can be any structure that can be applied to the switching control circuit 100 of the present application. In this embodiment, the example in which the power of the first output signal and the power of the second output signal are different is used for explanation. For example, refer to the attached Figure 1 , attached Figure 11 shows a schematic diagram of the connection between the switching control circuit 100 of the present application and at least two AC-DC conversion circuits (i.e., the first AC-DC conversion circuit 210 and the second AC-DC conversion circuit 220), wherein the first AC-DC conversion circuit 210 and the second AC-DC conversion circuit 220 each include an output component and at least one output port, and illustratively, the output component may include a rectifier and a filter, and the secondary coil Ns of each AC-DC conversion circuit is connected to at least one output port (attached port) via the rectifier and the filter. Figure 1 2 shows a 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). 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. The first output port 212 and the second output port 222 may refer to simple power supply output ports, or may refer to a control circuit including a power supply output port and a protocol chip, but are not limited thereto.

[0059] In addition, Figure 1 The main coil Np of the first AC-DC conversion circuit 210 is connected to an input component, wherein the input component includes an AC input rectifier, an EMI filter, and an energy storage capacitor. The AC input rectifier is connected to the EMI filter, the EMI filter is connected to the energy storage capacitor, and the energy storage capacitor is connected to the main coil Np. In other embodiments, the input component can also be other results and is not limited to the above examples. Figure 1 The figure shows a case where the first AC-DC conversion circuit 210 and the second AC-DC conversion circuit 220 share an input component. 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 main 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, but are not limited to this.

[0060] In one embodiment, continue to refer to the attached Figure 1The 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 the first output component 211, the first output port 212, the second output component 221 and the second output port 222; the control module 120 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 the first output port 212 has no power output demand and the second output port 222 has a power output demand, 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 with two states of on and off, or can further have a circuit protection function (such as backflow prevention). Exemplarily, it can be at least one controlled switch. When the switch module 110 includes a controlled switch, it is turned on or off under the control of the control module 120. In this embodiment, the switch module 110 is mainly used to control the transfer of output ports between two AC-DC conversion circuits. When the switch module 110 is in the on state, the output port of the second AC-DC conversion circuit 220 is connected to the first AC-DC conversion circuit 210. 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 any group of AC-DC conversion circuit outputs can be switched to the output of any other AC-DC conversion circuit output, and the output voltage, current, and power of multiple groups of AC-DC conversion circuits can be transferred to any group, thereby improving the overall efficiency of the switching power supply with multiple outputs. When the switch module 110 includes two controlled switches, taking the two controlled switches as MOS tubes as an example, the two MOS tubes can be connected back to back, that is, the source of one MOS tube is connected to the drain of the other MOS tube, and their gates (G) are connected together. This connection method can prevent current backflow, because when the current attempts to flow in the opposite direction, one of the MOS tubes will be closed, thereby preventing the current from flowing. In other embodiments, the two MOS tubes can also be connected in series, with the source (S) of one MOS tube connected to the drain (D) of the other MOS tube. This connection method can also effectively prevent current backflow, and when the current attempts to flow in the opposite direction, one of the MOS tubes will be closed, thereby 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, if the line between the secondary coil of the second AC-DC conversion circuit and the second output port 222 is conductive, the first output signal is transmitted to the secondary coil of the second AC-DC conversion circuit, causing the second AC-DC conversion circuit to work abnormally and be damaged. Therefore, when the control module 120 is about to control the switch module 110 to be turned on, the output component (such as a rectifier and / or a filter) in the second AC-DC conversion circuit can be controlled to stop working in advance or at the same time to disconnect the connection between the first output component 211 and the secondary coil of the second AC-DC conversion circuit 220, so as to prevent the output current of the first AC-DC conversion circuit 220 from being fed back to the secondary coil of the second AC-DC conversion circuit 220, thereby affecting 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 be disconnected by controlling the switch module 110, and 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 can be cut off by the switch module 110. At this time, regardless of whether the second output component 221 is working normally, the first output signal can be prevented from being fed back to the second AC-DC conversion circuit 220.

[0063] It should be noted that the logic operation of the control module 120 is not limited in this embodiment. The control module 120 in this embodiment can be any logic operator that can achieve the above-mentioned working purpose, that is, those skilled in the art can flexibly set the conditions under which 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 be turned on, and the output is controlled to stop working or the switch module 110 is controlled to connect the first output component 211 with the second output port 222, and 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 the output port of the second AC-DC conversion circuit 220 is plugged into an electrical device, and detecting the power supply demand (such as power supply time, power supply voltage, power supply current or power supply power, etc.) of the plugged electrical device. 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, which is not limited to this.

[0064] In this embodiment, the switch module 110 and the control module 120 can enable output signals of different powers of different groups of AC-DC circuits in the same power supply design to be switched and output at different output ports, so that the output of any group of AC-DC conversion circuits can be switched to the output of any other AC-DC conversion circuit output port, without setting up a DC-DC conversion circuit / module, and realizing the transfer of output voltages, currents, and powers of multiple groups of AC-DC conversion circuits to any group, thereby improving the overall efficiency of the switching power supply with multiple outputs.

[0065] In one embodiment, 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.

[0066] In this embodiment, the control module controls the switch module to disconnect the connection between the second output component and the first output component and the second output port while controlling the switch module to connect the first output component and the second output port, which 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, see the attached Figure 2 , attached Figure 2 FIG. 1 shows one of the structural diagrams of the switch module 110 in this embodiment; in order to highlight the structure of the switch module 110 in this embodiment, FIG. Figure 2 Only 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 are shown, 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 used to control the first switch unit 111 to conduct the connection between the first output component 211 and the second output port 222 when the first output port 212 has no power output demand and the second output port 222 has a power output demand, and control the second switch unit 112 to disconnect the connection between the second output component 221 and 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, and the second switch unit 112 mainly controls the connection between the second output component 221 and the first output component 211 and the second output port 222. The control module 120 can control the first switch unit 111 and the second switch unit 112 separately, 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 and 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; illustratively, when the second switch unit includes only one controlled switch, the controlled switch, under the action of the control module, only disconnects the second output component from the second output port and the first output component, so that the first output signal is transmitted through the second output port, and the second output port does not transmit the second output signal.

[0070] For another example, see the attached Figure 3 , attached Figure 3 FIG. 1 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, FIG. Figure 3 Only 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 are shown, and other structures in the first and second AC-DC conversion circuits are not shown. In this embodiment, when the second switch unit 112 includes a plurality of controlled switches, the number of the second output ports 222 is a plurality (see FIG. Figure 32 shows the case where the number of the second output ports 222 is 3). 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 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 second end of the first controlled switch 1122 is connected to the control module 120. The controlled ends of the second controlled switches 1122 are connected to the control module 120; the remaining second output ports 222 are output ports other than some of the second output ports 222 among the multiple second output ports 222; the control module 120 is also used to control the first controlled switch 1121 to be turned on or off when the first output port 212 has no power output demand and the second output port 222 has a power output demand, and to 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.

[0071] The controlled switch in the present application may be any controlled switch element, for example, a MOS tube, a triode, a relay, etc. Taking the MOS tube as an example, the first end of the controlled switch refers to the source of the MOS tube, the second end of the controlled switch refers to the drain of the MOS tube, and the controlled end of the controlled switch refers to the gate of the MOS tube.

[0072] Specifically, when the first output port 212 has no power output demand and the second output port 222 has a power output demand, 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, which means that the second output component 221 is connected to part of the second output ports 222, and 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 at the same time, thereby improving the applicability of the switching control circuit 100.

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

[0074] In one embodiment, see the attached Figure 4 , attached Figure 4FIG. 2 shows a second schematic diagram of the structure of the second switch unit 112 in this embodiment. In order to highlight the structure of the second switch unit 112 in this embodiment, FIG. Figure 4 Only 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 are shown, and other structures in the first and second AC-DC conversion circuits are not shown. The second switch unit 112 in this embodiment also 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 ports 222 and the second end of the second controlled switch 1122, and the controlled end of the third controlled switch 1123 is connected to the control module 120; the control module 120 is also used to control one of the first controlled switch 1121 and the third controlled switch 1123 to be turned on and the other to be turned off when the first output port 212 has no power output demand and the second output port 222 has a power output demand.

[0075] In this embodiment, a third controlled switch 1123 is further provided on the basis of the first controlled switch 1121 and the second controlled switch 1122. The control module 120 controls one of the first controlled switch 1121 and the third controlled switch 1123 to be turned on and the other to be turned off while controlling the second controlled switch 1122 to be turned off. 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 is ensured 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 be turned off, controls the first controlled switch 1121 to be turned on, and controls the third controlled switch 1123 to be turned 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 port 222 can transmit the first output signal and the second output signal at the same time. When the control module 120 controls the second controlled switch 1122 to be turned off, controls the first controlled switch 1121 to be turned off, and controls the third controlled switch 1123 to be turned on, the first output signal can be transmitted through any second output port 222, and the second output port 222 does not transmit the second output signal.

[0076] In one embodiment, see the attached Figure 5 , attached Figure 5 The third structural schematic diagram of the second switch unit 112 in this embodiment is shown. In order to highlight the structure of the second switch unit 112 in this embodiment, the attached Figure 5Only 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 are shown, and other structures in the first and second AC-DC conversion circuits are not shown. The second switch unit 112 in this embodiment also includes a fourth controlled switch 1124, a first end of the fourth controlled switch 1124 is connected to the second output port 222, a second end of the fourth controlled switch 1124 is connected to the second end of the second controlled switch 1122, a controlled end of the fourth controlled switch 1124 is connected to the control module 120, and the fourth controlled switch 1124 is used to disconnect the connection between the second controlled switch 1122 and the remaining second output ports 222 under the control of the control module 120.

[0077] In this embodiment, a fourth controlled switch 1124 is provided while the second controlled switch 1122 is provided, and the fourth controlled switch 1124 is connected back to back with the second controlled switch 1122, that is, when the first controlled switch 1121 and the fourth controlled switch 1124 are both MOS transistors, the source of one MOS transistor is connected to the drain of another MOS transistor, and their gates (G) are connected together and are connected to the control module 120. When the current tries to flow in the reverse direction, one of the MOS transistors will be closed, thereby preventing the current from flowing and preventing the current from flowing back.

[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, such as 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. In this case, the purpose of preventing current backflow can also be achieved.

[0079] In one embodiment, see the attached Figure 6 , attached Figure 6 The second schematic diagram of the structure of the switching control circuit in this embodiment is shown. In order to highlight the structure of the switching control circuit 100 in this embodiment, Figure 6 Only 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 are shown, and 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 the first output port 212 has no power output demand and the second output port 222 has a power output demand.

[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, and when the first controlled switch 1121 is turned on, part of the second output port 222 connected to the first controlled switch 1121 can also support the transmission of the second output signal.

[0081] In one embodiment, there are multiple second output ports; 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 turn on the connection between the second output component and some 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 demand of some of the second output ports is less than the power output demand of the remaining second output ports.

[0082] When the first output port has no power output demand, and the second output port has a power output demand, and the number of the second output ports is multiple, there are multiple output ports with different power demands. 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 demands of multiple second output ports. For example, the first output signal can be transmitted through the second output port with a larger power output demand, and the second output signal can be transmitted through the second output port with a smaller power output demand. Based on this, in this embodiment, when the power demands of multiple second output ports are different, the second switch unit is controlled to conduct the connection between the second output component and part of the second output ports, and the second switch unit is controlled to disconnect the connection between the second output component and the remaining second output components, and the second output component is controlled 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 part of the second output ports. At this time, the output demand of the remaining second output ports should be greater than the power output demand of some of the second output ports, that is, the power output demand of some of the second output ports is less than the output demand of the remaining second output ports.

[0083] In addition, when both the first output port and the second output port have power output requirements, 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 turn on the connection between the second output component and the second output port, and controls the second output component to work normally. 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, see the attached Figure 7 , attached Figure 7 FIG. 1 is a schematic diagram showing the structure of the control module 120 in this embodiment. In order to highlight the structure of the control module 120 in this embodiment, FIG. Figure 7 Only 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 are shown, and 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 the first output port 212 has no power output demand and the second output port 222 has a power output demand; the second control unit 122 is connected to the first control unit 121 and the second output component 221 respectively; the first control unit 121 is also used to control the second control unit 122 to control the second output component 221 to work normally or stop working when the first output port 212 has no power output demand and the second output port 222 has a power output demand.

[0085] Among them, the first control unit 121 can be a controller such as MCU (Microcontroller Unit), single-chip microcomputer, etc. that can perform logical operations. 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 resonance) controller, a PI (proportional integral) controller, etc., but is not limited to this. In this embodiment, the on and off of the switch module 110 and the working state of the second output component 221 can be controlled respectively by the first control unit 121 and the second control unit 122.

[0086] In one embodiment, see the attached Figure 8 , attached Figure 8The second structural diagram of the switch module 110 in this embodiment is shown. In order to highlight the structure of the switch module 110 in this embodiment, the attached Figure 8 Only 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 are shown, and other structures in the first and second AC-DC conversion circuits are not shown. The switch module 110 in this embodiment only includes the first switch unit 111, and 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 used to control the first switch unit 111 to conduct the connection between the first output component 211 and the second output port 222 when the first output port 212 has no power output demand and the second output port 222 has a power output demand, and control the second output component 221 to stop working.

[0087] In this embodiment, only the first switch unit 111 is provided to control 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. In order to prevent the current from flowing back into 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 be turned on, such as controlling the rectifier and / or filter in the output component to stop working, so as to ensure the circuit safety.

[0088] In one embodiment, in this embodiment, the first switch unit 111 includes at least one controlled switch. When the first switch unit 111 includes two controlled switches, refer to the attached Fig. 9 , attached Fig. 9 FIG. 1 is a schematic diagram showing the structure of the first switch unit in this embodiment. In order to highlight the structure of the first switch unit 111 in this embodiment, FIG. Fig. 9Only 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 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 the present application, and can be any controlled switch element such as a MOS tube, a triode, a relay, etc. When it is a MOS tube, the first end of the controlled switch is the source of the MOS tube, the second end of the controlled switch is the drain of the MOS tube, and the controlled end of the controlled switch is the gate of the MOS tube. 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 circuit stability.

[0090] In one embodiment, see the attached Fig.10 , attached Fig.10The third structural schematic diagram of the switching control circuit 100 in this embodiment is shown. 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~Q3, wherein the gates of the MOS transistors Q1~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 port 222#1, the second output port 222#2 and the second output port 222#3 connected to the drain of the second MOS transistor Q3, and the source of the MOS transistor Q3 is connected to the filter in the second AC-DC conversion circuit 220. Among them, when the first output port 212 has no power output demand and the second output port 222 has a power output demand, the on-off logic control unit 1211 controls the MOS tube Q1 and the MOS tube Q2 to be turned on, and controls the MOS tube Q3 to be turned off. The on-off logic control unit 1211 is connected to the rectifier control unit 1221, and the rectifier 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 rectifier control unit 1221 to control the rectifier in the second AC-DC conversion circuit 220 to stop working 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, so that the second output port 222#1~the second output port 222#3 are all turned on and connected to the filter of the first AC-DC conversion circuit, so that the second output port 222#1~the second output port 222#3 can all transmit the first output signal.

[0091] Among them, the MOS tube Q1 is equivalent to the fifth controlled switch in the above embodiment, the MOS tube Q2 is equivalent to the sixth controlled switch in the above embodiment, the MOS tube Q3 is equivalent to the above second controlled switch, 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 repeated here.

[0092] In one embodiment, see the attached Fig.11 , attached Fig.11FIG4 shows a fourth structural schematic diagram of the switching control circuit 100 in the present embodiment. The switching control circuit 100 in the present embodiment includes an on-off logic control unit 1211, a rectification control unit 1221, and MOS transistors Q1 to Q5, wherein the gates of the MOS transistors Q1 to Q5 are all connected to the on-off logic control unit 1211, wherein the source of the MOS transistor Q1 is connected to the filter of the first AC-DC conversion circuit 210 and the first output port 212, 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 AC-DC conversion circuit The on-off logic control unit 1211 is connected to the second output port 222#1 of 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 respectively connected to the second output port 222#2 and the second output port 222#3 of the second AC-DC conversion circuit 220 and the source of the MOS transistor Q5, the drain of the MOS transistor Q4 is respectively connected to the second output port 222#1 of the second AC-DC conversion circuit 220 and the source of the MOS transistor Q2, and 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 the first output port 212 has no power output demand and the second output port 222 has power output demand, the on-off logic control unit 1211 controls the MOS transistors Q1 and Q2 to be turned on, controls the MOS transistors Q3 and Q4 to be turned off, and controls the MOS transistor Q5 to be turned on. At the same time, when the first output port 212 has no power output demand and the second output port 222 has power output demand, the rectifier control unit 1221 controls the rectifier in the second AC-DC conversion circuit 220 to work normally, so that the second output port #1 is connected to the filter of the first AC-DC conversion circuit, so that the second output port 222 #1 can transmit the first output signal. At the same time, the second output port 222 #2 and the second output port 222 #3 are connected to the filter of the second AC-DC conversion circuit, so that the second output port 222 #2 and the second output port 222 #3 can simultaneously transmit the second output signal.

[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 above second controlled switch, 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 are not repeated here.

[0094] In one embodiment, see the attached Fig.12 , attached Fig.12 FIG5 shows a fifth 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 rectifier control unit 1221, MOS transistors Q1~Q3, and MOS transistors Q5~Q6, wherein the gates of the MOS transistors Q1~Q3 and MOS transistors Q5~Q6 are all connected to the on-off logic control unit 1211, wherein the source of the MOS transistor Q1 is connected to the filter of the first AC-DC conversion circuit 210 and the first output port 212, and the drain of the MOS transistor Q1 is connected to the MOS transistor Q2. The drain of the MOS transistor Q2 is connected, 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, and 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, and the rectification control unit 1221 is connected to the rectifier in the second AC-DC conversion circuit 220. When the first output port 212 has no power output demand and the second output port 222 has power output demand, the on-off logic control unit 1211 controls the MOS transistors Q1 and Q2 to be turned on, controls the MOS transistors Q3 and Q6 to be turned off, and controls the MOS transistor Q5 to be turned on. At the same time, when the first output port 212 has no power output demand and the second output port 222 has power output demand, the rectifier control unit 1221 is also controlled to control the rectifier in the second AC-DC conversion circuit 220 to work normally, so that the second output port 222#1 is connected to the filter of the first AC-DC conversion circuit, so that the second output port 222#1 can transmit the first output signal. At the same time, the second output port 222#2 and the second output port 222#3 are connected to the filter of the second AC-DC conversion circuit, so that the second output port 222#2 and the second output port 222#3 can simultaneously transmit the second output signal.

[0095] 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 above second controlled switch, the MOS transistor Q5 is equivalent to the first controlled switch in the above embodiment, the 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. The corresponding functions are the same as those in the above embodiment and are not repeated here.

[0096] In one embodiment, a switching power supply is also 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, wherein the AC-DC conversion module includes at least 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-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0098] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the application. It should be noted that, for a person of ordinary skill in the art, several variations and improvements may be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached 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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