Switching control circuit and switching power supply

Abstract

The present application relates to a switching control circuit and a switching power supply. The switching control circuit comprises a switch module and a control module. The switch module is separately connected to a first output assembly, a first output port, a second output assembly, and a second output port. The control module is connected to the switch module, and is used for controlling the switch module to conduct the first output assembly and the second output port, so that a first output signal is transmitted via the second output port.

Description

Switching control circuit and switching power supply

[0001] Related applications

[0002] This application claims priority to Chinese patent application filed on July 24, 2024, with application number 202411004545.X, entitled "Switching Control Circuit and Switching Power Supply", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of switching power supply circuit design technology, and in particular to switching control circuits and switching power supplies. Background Technology

[0004] The energy efficiency standards for switching power supplies have very clear requirements and ranges. The energy efficiency of switching power supplies has a direct impact on the overall temperature of the device, and the temperature has a very direct impact on the end user's experience.

[0005] To meet the demands of multi-port applications in current mainstream charging adapters, when switching power supplies have multiple DC-DC (Direct Current-to-Direct Current) conversion circuits at the output, power loss occurs during the conversion process from the front-stage AC-DC (Alternating Current-to-Direct Current) converter to the subsequent DC-DC converter. As the number of power modules in the subsequent DC-DC converter increases, the overall power loss of the device also increases. Therefore, the multiple DC-DC converter outputs of switching power supplies pose a significant challenge to overall efficiency, and the resulting energy losses pose a major challenge to energy efficiency and environmental protection.

[0006] Application content

[0007] Therefore, it is necessary to provide a switching control circuit and switching power supply that can reduce power loss in order to address the above problems.

[0008] 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 a 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 a switch module and a control module. The switch module is 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 connect the first output component and the second output port when there is no power output demand at the first output port and a power output demand at the second output port, so that the first output signal is transmitted through the second output port.

[0009] 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 the first output port has no power output requirement and the second output port has a power output requirement.

[0010] In one embodiment, the switch module includes a first switch unit and a second switch unit. The first switch unit is connected to a first output component, a first output port, a second output port, and a control module, respectively. The second switch unit is connected to a second output component, the first switch unit, the second output port, and the control module, respectively.

[0011] The control module is used to control the first switching unit to connect 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, and to control the second switching unit to disconnect the second output component and the second output port.

[0012] In one embodiment, the second switching unit includes at least one controlled switch.

[0013] In one embodiment, when the second switching unit includes multiple controlled switches, the number of second output ports is multiple.

[0014] In one embodiment, the second switching unit includes a first controlled switch and a second controlled switch. The first terminal of the first controlled switch is connected to a portion of the second output ports, the second terminal of the first controlled switch is connected to a second output component, and the controlled terminal of the first controlled switch is connected to a control module. The first terminal of the second controlled switch is connected to the second output component, the second terminal of the second controlled switch is connected to the first switching unit and the remaining second output ports, and the controlled terminal of the second controlled switch is connected to the control module. The remaining second output ports are the output ports other than a portion of the multiple second output ports.

[0015] The control module is also used to control the first controlled switch to be turned on or off when there is no power output requirement at the first output port and there is a power output requirement at the second output port, and to control the second controlled switch to disconnect the connection between the second output component and the first output component and the other second output ports.

[0016] In one embodiment, the second switch unit further includes 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.

[0017] The control module is also used 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 there is no power output demand at the first output port and there is a power output demand at the second output port.

[0018] In one embodiment, the second switch unit further includes a fourth controlled switch, the first end of which is connected to the second output port, the second end of which is connected to the second end of the second controlled switch, and the controlled end of which is connected to the control module. The fourth controlled switch is used to disconnect the connection between the second controlled switch and the other second output ports under the control of the control module.

[0019] In one embodiment, the control module is also connected to the second output component, and the control module is also used to control the second output component to work normally or stop working when the first output port has no power output requirement and the second output port has a power output requirement.

[0020] In one embodiment, there are multiple second output ports; 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 switching unit to connect the second output component with some of the second output ports, and controls the second switching unit to disconnect the second output component from the remaining second output components, and controls the second output component to work normally; wherein, the power output requirement of some of the second output ports is less than the power output requirement of the remaining second output ports.

[0021] In one embodiment, the control module includes a first control unit and a second control unit. The first control unit is connected to the switch module and is used to control the switch module to connect 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 a power output demand. The second control unit is connected to both the first control unit and the second output component.

[0022] The first control unit is also used to control the second control unit to control the second output component to work normally or 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.

[0023] In one embodiment, the switch module includes a first switch unit, which is connected to a first output component, a first output port, a second output component, a second output port, and a control module.

[0024] The control module is also connected to the second output component, and is used to control the first switching unit to connect the first output component and the second output port while controlling 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.

[0025] 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 a fifth controlled switch and a sixth controlled switch. The first end of the fifth controlled switch is connected to the first output component and the first output port, and the controlled end of the fifth controlled switch is connected to the control module. The fifth controlled switch is turned on under the control of the control module. The first end of the sixth controlled switch is connected to the second output port, and the second end of the sixth controlled switch is connected to the second end of the fifth controlled switch. The sixth controlled switch is turned on under the control of the control module.

[0026] In one embodiment, the switching control circuit includes an on / off logic control unit, a rectification control unit, a first MOSFET, a second MOSFET, and a third MOSFET. The gates of the first MOSFET, the second MOSFET, and the third MOSFET are all connected to the on / off logic control unit. The source of the first MOSFET is connected to the filter and the first output port of the first AC-DC conversion circuit. The drain of the first MOSFET is connected to the drain of the second MOSFET. The source of the second MOSFET is connected to the drain of the third MOSFET. The drain of the third MOSFET is also connected to the second output port. The source of the third MOSFET is connected to the filter of the second AC-DC conversion circuit.

[0027] In one embodiment, the switching control circuit includes an on / off logic control unit, a rectification control unit, a first MOSFET, a second MOSFET, a third MOSFET, a fourth MOSFET, and a fifth MOSFET. The gates of the first MOSFET, second MOSFET, third MOSFET, fourth MOSFET, and fifth MOSFET are all connected to the on / off logic control unit. The source of the first MOSFET is connected to the filter and the first output port of the first AC-DC conversion circuit. The drain of the first MOSFET is connected to the drain of the second MOSFET. The source of the second MOSFET is connected to the drain of the fourth MOSFET. The source of the second MOSFET is also connected to the second AC-DC conversion circuit. The second output port of the AC-DC converter circuit is connected; the source of the third MOSFET is connected to the filter of the second AC-DC converter circuit; the source of the fourth MOSFET is connected to the second output port of the second AC-DC converter circuit and the source of the fifth MOSFET; the drain of the third MOSFET is connected to the second output port of the second AC-DC converter circuit and the source of the second MOSFET; the drain of the fifth MOSFET is connected to the filter of the second AC-DC converter circuit and the source of the third MOSFET; the on / off logic control unit is connected to the rectification control unit, and the rectification control unit is connected to the rectifier of the second AC-DC converter circuit.

[0028] In one embodiment, the switching control circuit includes an on / off logic control unit, a rectification control unit, a first MOSFET, a second MOSFET, a third MOSFET, a fifth MOSFET, and a sixth MOSFET. The gates of the first MOSFET, the second MOSFET, the third MOSFET, the fifth MOSFET, and the sixth MOSFET are all connected to the on / off logic control unit. The source of the first MOSFET is connected to the filter and the first output port of the first AC-DC conversion circuit. The drain of the first MOSFET is connected to the drain of the second MOSFET. The source of the second MOSFET is connected to the source of the sixth MOSFET and the second output port of the second AC-DC conversion circuit. The source of the third MOSFET is connected to the filter of the second AC-DC conversion circuit. The drain of the third MOSFET is connected to the drain of the sixth MOSFET. The source of the fifth MOSFET is connected to the second output port of the second AC-DC conversion circuit. The drain of the fifth MOSFET is connected to the source of the third MOSFET. The on / off logic control unit is connected to the rectification control unit, and the rectification control unit is connected to the rectifier of the second AC-DC conversion circuit.

[0029] Secondly, this application also provides a switching power supply, including: an AC-DC conversion module and a switching control circuit as described above, 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 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.

[0030] The aforementioned switching control circuit and switching power supply are described above. 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 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 a 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 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 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. As can be seen, the switching module and control module in this application enable the output signals of different AC-DC circuits with different power levels in the same power supply design to be switched at different output ports. This allows the output of any AC-DC conversion circuit to be switched to the output port of any other AC-DC conversion circuit without the need for a DC-DC conversion circuit / module. This achieves arbitrary transfer of the output voltage, current, and power of multiple AC-DC conversion circuits, thereby improving the overall efficiency of the multi-output switching power supply. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the disclosed drawings without creative effort.

[0032] Figure 1 is a schematic diagram of the switching control circuit in one embodiment of this application;

[0033] Figure 2 is a schematic diagram of the structure of a switch module in one embodiment of this application;

[0034] Figure 3 is a schematic diagram of the structure of the second switching unit in one embodiment of this application;

[0035] Figure 4 is a second schematic diagram of the structure of the second switching unit in one embodiment of this application;

[0036] Figure 5 is a third structural schematic diagram of the second switching unit in one embodiment of this application;

[0037] Figure 6 is a second schematic diagram of the switching control circuit in one embodiment of this application;

[0038] Figure 7 is a schematic diagram of the control module in one embodiment of this application;

[0039] Figure 8 is a second schematic diagram of the structure of the switch module in one embodiment of this application;

[0040] Figure 9 is a schematic diagram of the structure of the first switching unit in one embodiment of this application;

[0041] Figure 10 is a third schematic diagram of the switching control circuit in one embodiment of this application;

[0042] Figure 11 is a fourth schematic diagram of the switching control circuit in one embodiment of this application;

[0043] Figure 12 is a fifth schematic diagram of the switching control circuit in one embodiment of this application.

[0044] Reference numerals: Switching control circuit: 100; Switching module: 110; First switching unit: 111; Fifth controlled switch: 1111; Sixth controlled switch: 1112; Second switching 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; Rectifier 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

[0045] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0046] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0048] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0049] The switching control circuit 100 in this application is applied to scenarios with multiple AC-DC conversion circuits. The output signal electrical performance parameters (such as voltage, current, power, etc.) of these multiple AC-DC conversion circuits are different, enabling free switching between the output ports of each AC-DC conversion circuit without the need for a DC-DC conversion circuit / module. It should be noted that this application does not impose specific limitations on the structure of the AC-DC conversion circuit; any structure suitable for the switching control circuit 100 can be used. This embodiment uses the example of different power levels for the first and second output signals for explanation.

[0050] Referring to Figure 1, which illustrates a schematic diagram of the switching control circuit 100 of this 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), 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, and the secondary coil Ns of each AC-DC conversion circuit is connected to at least one output port (Figure 1 shows 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) via a rectifier and a filter. This application uses the example of the first AC-DC conversion circuit 210 including a first output component 211 and a first output port 212, and the second AC-DC conversion circuit 220 including a second output component 221 and a second output port 222 for illustration. The first output port 212 and the second output port 222 may refer to a simple power supply output port, or they may be control circuits including a power supply output port and a protocol chip, and are not limited thereto.

[0051] Furthermore, Figure 1 illustrates a case where the main coil Np of the first AC-DC conversion circuit 210 is connected to an input component. This input component includes an AC input rectifier, an EMI (Electromagnetic Interference) 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 may be different and not limited to the examples described above. Figure 1 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 or different structures. For example, the main coil of the first AC-DC conversion circuit 210 may be connected to the first input component, and the second AC-DC conversion circuit 220 may be connected to the second input component. The structures of the first and second input components may be the same or different, and this is not a limitation.

[0052] In one embodiment, referring to Figure 1, the switching control circuit 100 of this application includes a switch module 110 and a control module 120. The switch module 110 is connected to the first output component 211, the first output port 212, the second output component 221, and the second output port 222, respectively. The control module 120 is connected to the switch module 110 and is used to control the switch module 110 to connect the first output component 211 and the second output port 222 when the first output port 212 has no power output requirement and the second output port 222 has a power output requirement, so that the first output signal is transmitted through the second output port 222.

[0053] In this context, the switch module 110 refers to a module or component that has both on and off states, or can further provide circuit protection (such as backflow prevention). For example, 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 output port transfer 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 switch outputs according to any connected AC-DC conversion circuit. This allows the output of any one set of AC-DC conversion circuits to be switched to the output port of any other AC-DC conversion circuit, enabling arbitrary transfer of the output voltage, current, and power of multiple AC-DC conversion circuits, thus improving the overall efficiency of the multi-output switching power supply.

[0054] When the switching module 110 includes two controlled switches, taking two MOSFETs (Metal Oxide Semiconductor Field Effect Transistors) as an example, the two MOSFETs can be connected back-to-back, that is, the source of one MOSFET is connected to the drain of the other MOSFET, and their gates (G) are connected together. This connection method can prevent current backflow because if current attempts to flow in the reverse direction, one of the MOSFETs will turn off, thereby stopping the current flow. In other embodiments, the two MOSFETs can also be connected in series, with the source (S) of one MOSFET connected to the drain (D) of the other MOSFET. This connection method can also effectively prevent current backflow, as if current attempts to flow in the reverse direction, one of the MOSFETs will turn off, thereby stopping the current flow.

[0055] Furthermore, 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 220, and if the line between the secondary coil of the second AC-DC conversion circuit 220 and the second output port 222 is conductive, the first output signal will be transmitted to the secondary coil of the second AC-DC conversion circuit 220, causing the second AC-DC conversion circuit 220 to malfunction and be damaged. Therefore, when the control module 120 is about to turn on the switch module 110, it can control the output components (such as rectifiers and / or filters) in the second AC-DC conversion circuit 220 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 prevent the output current of the first AC-DC conversion circuit 220 from flowing back to the secondary coil of the second AC-DC conversion circuit 220, thus 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. The switch module 110 cuts off the connection between the first output component 211 and the second output component 221, as well as 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 is working normally, the first output signal can be prevented from flowing back to the second AC-DC conversion circuit 220.

[0056] It should be noted that this embodiment does not limit the logical operations of the control module 120. The control module 120 in this embodiment can be any logic unit capable of achieving 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. For example, when the control module 120 is also connected to the detection module, upon receiving the detection signal output by the detection module, the control module 110 is turned on, and the output is stopped, or the control module 110 is turned on to connect the first output component 211 and the second output port 222, and the control module 110 is turned off to disconnect the second output component 221 from the first output component 211 and the second output port 222. The detection module can be an electronic component used to detect whether a power device is inserted into the output port of the second AC-DC conversion circuit 220, and to detect the power supply requirements (such as power supply time, power supply voltage, power supply current, or power supply power) of the inserted power device. Based on this, the switching control circuit 100 of this application can also realize the transfer of single-port blind insertion power to other ports, and is not limited thereto.

[0057] In this embodiment, the switching module 110 and the control module 120 enable the output signals of different AC-DC circuits with different power levels to be switched at different output ports in the same power supply design. This allows the output of any AC-DC conversion circuit to be switched to the output port of any other AC-DC conversion circuit without the need for a DC-DC conversion circuit / module. This achieves arbitrary transfer of the output voltage, current, and power of multiple AC-DC conversion circuits, improving the overall efficiency of the multi-output switching power supply.

[0058] In one embodiment, the control module 120 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 the first output port has no power output requirement and the second output port has a power output requirement.

[0059] In this embodiment, while the control module 120 controls the switch module to connect the first output component and the second output port, the control module 120 also controls the switch module to disconnect the second output component from the first output component and the second output port. This effectively prevents the first output signal from flowing back to the second AC-DC conversion circuit 220 and affecting the second AC-DC conversion circuit 220.

[0060] In one embodiment, referring to Figure 2, Figure 2 shows one of the structural schematic diagrams of the switch module 110 in this embodiment. To highlight the structure of the switch module 110 in this embodiment, 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. Other structures in the first and second AC-DC conversion circuits 220 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 connected to the first output component 211, the first output port 212, the second output port 222, and the control module 120, respectively. The second switch unit 112 is connected to the second output component 221, the first switch unit 111, the second output port 222, and the control module 120, respectively. The control module 120 is used to control the first switch unit 111 to connect the first output component 211 and the second output port 222, and to control the second switch unit 112 to disconnect the second output component 221 and the second output port 222, respectively, when the first output port 212 has no power output requirement and the second output port 222 has a power output requirement.

[0061] The first switching unit 111 and the second switching unit 112 each include at least one controlled switch. The first switching unit 111 primarily controls the connection between the first output component 211 and the second output port 222, while the second switching unit 112 primarily 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 independently control the first switching unit 111 and the second switching unit 112, ensuring that when the first switching unit 111 connects the first output component 211 and the second output port 222, it simultaneously controls the second switching unit 112 to disconnect the second output component 221 from the first output component 211 and the second output port 222, thus preventing the first output signal from flowing back to the second AC-DC conversion circuit 220.

[0062] In one embodiment, the second switching unit includes at least one controlled switch; for example, when the second switching unit includes only one controlled switch, the controlled switch, under the action of the control module, only disconnects the connection between the second output component and the second output port and the first output component 211, 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 at this time.

[0063] Another example is shown in Figure 3, which illustrates one of the structural schematic diagrams of the second switching unit in this embodiment. To highlight the structure of the second switching unit 112 in this embodiment, only 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 in Figure 3. Other structures in the first and second AC-DC conversion circuits 220 are not shown.

[0064] In this embodiment, when the second switch unit 112 includes multiple controlled switches, the number of second output ports 222 is also multiple (Figure 3 shows the case where the number of 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 a portion 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, and the second end of the second controlled switch 1122 is connected to the first switch unit 111 and the remaining second output ports 222. The controlled terminal of the control switch 1122 is connected to the control module 120; the remaining second output ports 222 are the output ports other than some of 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.

[0065] In this application, the controlled switch can be any controlled switching element, such as a MOSFET, a transistor, or a relay. Taking a MOSFET as an example, the first terminal of the controlled switch refers to the source of the MOSFET, the second terminal of the controlled switch refers to the drain of the MOSFET, and the controlled terminal of the controlled switch refers to the gate of the MOSFET.

[0066] Specifically, when the first output port 212 has no power output requirement but the second output port 222 does, the control module 120 controls the first controlled switch 1121 to turn on and the second controlled switch 1122 to turn off. This means that the second output component 221 is connected to some of the second output ports 222, and some 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 ports 222 can transmit both the first and second output signals simultaneously, improving the applicability of the switching control circuit 100.

[0067] When there is no power output requirement at the first output port 212 and a power output requirement at the second output port 222, if the control module 120 controls the first controlled switch 1121 to open and the second controlled switch 1122 to open, it means that the connection between the second output component 221 and all the second output ports 222 is disconnected. At this time, only the remaining second output ports 222 are used to transmit the first output signal.

[0068] In one embodiment, referring to Figure 4, Figure 4 shows a second structural schematic diagram of the second switching unit 112 in this embodiment. In order to highlight the structure of the second switching unit 112 in this embodiment, Figure 4 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.

[0069] In this embodiment, the second switch unit 112 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, and the second end of the third controlled switch 1123 is connected to the other second output ports 222 and the second ends of the second controlled switches 1122. 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.

[0070] In this embodiment, a third controlled switch 1123 is added in addition to the first controlled switch 1121 and the second controlled switch 1122. While controlling the second controlled switch 1122 to open, the control module 120 simultaneously controls one of the first controlled switch 1121 and the third controlled switch 1123 to open and the other to close. This allows the first output signal to be transmitted through all second output ports 222 when no transmission of the second output signal is required. When transmission of the second output signal is required, 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 open, controls the first controlled switch 1121 to open, and controls the third controlled switch 1123 to close, some second output ports 222 transmit the second output signal, while the remaining output ports transmit the first output signal. The second output ports 222 can transmit both the first and second output signals simultaneously. When the control module 120 controls the second controlled switch 1122 to open, controls the first controlled switch 1121 to open, and controls the third controlled switch 1123 to open, the first output signal can be transmitted through any second output port 222. At this time, the second output port 222 does not transmit the second output signal.

[0071] In one embodiment, referring to Figure 5, Figure 5 shows a third structural schematic diagram of the second switching unit 112 in this embodiment. In order to highlight the structure of the second switching unit 112 in this embodiment, Figure 5 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.

[0072] In this embodiment, the second switch unit 112 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 other second output ports 222 under the control of the control module 120.

[0073] In this embodiment, a fourth controlled switch 1124 is added along with the second controlled switch 1122. The fourth controlled switch 1124 is connected back-to-back with the second controlled switch 1122. That is, when both the first controlled switch 1121 and the fourth controlled switch 1124 are MOSFETs, the source of one MOSFET is connected to the drain of the other MOSFET, and their gates (G) are connected together, both connected to the control module 120. When current attempts to flow in the reverse direction, one of the MOSFETs will turn off, thereby preventing current flow and preventing current backflow.

[0074] It is 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. In this case, the purpose of preventing current backflow can also be achieved.

[0075] In one embodiment, referring to Figure 6, which shows a second schematic diagram of the switching control circuit in this embodiment, to highlight the structure of the switching control circuit 100 in this embodiment, 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. In this embodiment, the control module 120 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.

[0076] 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, but 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, the second output port 222 connected to the second controlled switch 1122 can also support the transmission of the first output signal when the second controlled switch 1122 is off, and when the first controlled switch 1121 is on, the part of the second output port 222 connected to the first controlled switch 1121 can also support the transmission of the second output signal.

[0077] In one embodiment, there are multiple second output ports 222. When the first output port 212 has no power output requirement and the power output requirements of the multiple second output ports 222 are different, the control module controls the second switching unit to connect the second output component with some of the second output ports 222, and controls the second switching unit to disconnect the second output component from the remaining second output components, and controls the second output component to work normally. Among them, the power output requirement of some of the second output ports 222 is less than the power output requirement of the remaining second output ports 222.

[0078] When there is no power output requirement at the first output port 212, but a power output requirement at the second output port 222, and there are multiple second output ports 222, there may be situations where the power requirements of the 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 222. For example, if the first output signal can be transmitted through the second output port 222 with a higher power output requirement, the second output signal can be controlled to be transmitted through the second output port 222 with a lower power output requirement. Based on this, in this embodiment, when the power requirements of the multiple second output ports 222 are different, the second switching unit is controlled to connect the second output component to some of the second output ports, and the second switching unit is controlled to disconnect the second output component from 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 222 and the second AC-DC conversion circuit can output the second output signal to some of the second output ports 222. At this time, the output demand of the remaining second output ports 222 should be greater than the power output demand of some second output ports 222, that is, the power output demand of some second output ports 222 is less than the output demand of the remaining second output ports 222.

[0079] Furthermore, when both the first output port 212 and the second output port 222 have power output requirements, the control module controls the first switch unit 111 to disconnect the connection between the first output component 211 and the second output component 221 and the second output port 222, and controls the second switch unit 112 to connect the connection between the second output component 221 and the second output port 222, and controls the second output component 221 to work normally. At this time, the first output port 212 transmits the first output signal of the first AC-DC conversion circuit, and the second output port 222 transmits the second output signal of the second AC-DC conversion circuit. At this time, the number of second output ports 222 can be one or more.

[0080] In one embodiment, referring to Figure 7, Figure 7 shows a schematic diagram of the structure of the control module 120 in this embodiment. In order to highlight the structure of the control module 120 in this embodiment, only 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 in Figure 7. Other structures in the first and second AC-DC conversion circuits are not shown.

[0081] In this embodiment, the control module 120 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 connect the first output component 211 and the second output port 222 when the first output port 212 has no power output requirement and the second output port 222 has a power output requirement. The second control unit 122 is connected to both the first control unit 121 and the second output component 221. 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 requirement and the second output port 222 has a power output requirement.

[0082] The first control unit 121 can be a controller capable of performing logic operations, such as an MCU (Microcontroller Unit) or a single-chip microcomputer. The second control unit 122 can be flexibly configured according to the structure of the output components. For example, if the output components include a rectifier and a filter, it can be either a rectifier controller or a filter controller. For instance, if it is a rectifier controller, it can be a PR (Proportion Resonant) controller, a PI (Proportion Integration) controller, etc., and is not limited to these. In this embodiment, the first control unit 121 and the second control unit 122 can respectively control the on / off state of the switching module 110 and the operating state of the second output component 221.

[0083] In one embodiment, referring to Figure 8, Figure 8 shows a second structural schematic diagram of the switch module 110 in this embodiment. In order to highlight the structure of the switch module 110 in this embodiment, 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.

[0084] In this embodiment, the switch module 110 includes only a first switch unit 111. The first switch unit 111 is 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 connect the first output component 211 and the second output port 222 and control the second output component 221 to stop working when the first output port 212 has no power output requirement and the second output port 222 has a power output requirement.

[0085] In this embodiment, only the first switch unit 111 is set to control the connection between the first output component 211 and the second output port 222, so that the first output signal can be transmitted through the second output port 222. In order to prevent 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 turn on. For example, controlling the rectifier and / or filter in the output component to stop working can ensure circuit safety.

[0086] In one embodiment, the first switching unit 111 in this embodiment includes at least one controlled switch. When the first switching unit 111 includes two controlled switches, refer to Figure 9. Figure 9 shows a schematic diagram of the structure of the first switching unit in this embodiment. In order to highlight the structure of the first switching unit 111 in this embodiment, only 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 in Figure 9. Other structures in the first and second AC-DC conversion circuits are not shown. In this embodiment, the first switch unit 111 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. 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. The sixth controlled switch 1112 is turned on under the control of the control module 120.

[0087] In this embodiment, 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 MOSFET, a transistor, or a relay. When it is a MOSFET, the first terminal of the controlled switch is the source of the MOSFET, the second terminal of the controlled switch is the drain of the MOSFET, and the controlled terminal of the controlled switch is the gate of the MOSFET. In this embodiment, the first switch unit 111 is configured as two controlled switches, which are connected back to back to prevent current backflow and improve circuit stability.

[0088] In one embodiment, referring to Figure 10, which shows a third 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, a first MOSFET Q1, a second MOSFET Q2, and a third MOSFET Q3. The gates of the first MOSFET Q1, the second MOSFET Q2, and the third MOSFET Q3 are all connected to the on / off logic control unit 1211. The source of the first MOSFET Q1 is connected to the filter and the first output port 212 of the first AC-DC conversion circuit 210. The drain of the first MOSFET Q1 is connected to the drain of the second MOSFET Q2. The source of the second MOSFET Q2 is connected to the drain of the third MOSFET 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 third MOSFET Q3. The source of the third MOSFET Q3 is connected to the filter in the second AC-DC conversion circuit 220.

[0089] When the first output port 212 has no power output requirement but the second output port 222 has a power output requirement, the on / off logic control unit 1211 controls the first MOSFET Q1 and the second MOSFET Q2 to turn on and controls the third MOSFET Q3 to turn off. The on / off logic control unit 1211 is connected to the rectification control unit 1221, which 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 stop the rectifier in the second AC-DC conversion circuit 220 when the first output port 212 has no power output requirement but the second output port 222 has a power output requirement. This allows the second output ports 222#1 to 222#3 to be connected to the filter of the first AC-DC conversion circuit, so that the second output ports 222#1 to 222#3 can all transmit the first output signal.

[0090] In this embodiment, the first MOSFET Q1 is equivalent to the fifth controlled switch, the second MOSFET Q2 is equivalent to the sixth controlled switch, the third MOSFET Q3 is equivalent to the second controlled switch, the on / off logic control unit 1211 is equivalent to the first control unit, and the rectifier control unit 1221 is equivalent to the second control unit. Their functions are the same as those in the above embodiments and will not be repeated here.

[0091] In one embodiment, referring to Figure 11, which shows a fourth schematic diagram of the switching control circuit 100 in this embodiment, the switching control circuit 100 includes an on / off logic control unit 1211, a rectifier control unit 1221, a first MOSFET Q1, a second MOSFET Q2, a third MOSFET Q3, a fourth MOSFET Q4, and a fifth MOSFET Q5. The gates of the first MOSFET Q1, second MOSFET Q2, third MOSFET Q3, fourth MOSFET Q4, and fifth MOSFET Q5 are all connected to the on / off logic control unit 1211. The source of the first MOSFET Q1 is connected to the filter and the first output port 212 of the first AC-DC conversion circuit 210, and the drain of the first MOSFET Q1 is connected to the second MOSFET Q5. The drain of the second MOSFET Q2 is connected to the drain of the fourth MOSFET Q4 and the second output port 222#1 of the second AC-DC conversion circuit 220. The source of the third MOSFET Q3 is connected to the filter in the second AC-DC conversion circuit 220. The source of the fourth MOSFET Q4 is 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 fifth MOSFET Q5. The drain of the third MOSFET Q3 is connected to the second output port 222#1 of the second AC-DC conversion circuit 220 and the source of the second MOSFET Q2. The drain of the fifth MOSFET Q5 is connected to the filter in the second AC-DC conversion circuit 220 and the source of the third MOSFET 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 demand at the first output port 212 but a power output demand at the second output port 222, the on / off logic control unit 1211 controls the first MOSFET Q1 and the second MOSFET Q2 to turn on, controls the third MOSFET Q3 and the fourth MOSFET Q4 to turn off, and controls the fifth MOSFET Q5 to turn on. Simultaneously, when there is no power output demand at the first output port 212 but a power output demand at the second output port 222, the rectifier control unit 1221 controls the rectifier in the second AC-DC conversion circuit 220 to operate normally, enabling the connection between the second output port #1 and the filter of the first AC-DC conversion circuit, thus allowing the second output port 222#1 to transmit the first output signal. Simultaneously, the second output ports 222#2 and 222#3 are connected to the filters of the second AC-DC conversion circuit, allowing the second output ports 222#2 and 222#3 to simultaneously transmit the second output signal.

[0092] In this embodiment, the first MOSFET Q1 is equivalent to the fifth controlled switch, the second MOSFET Q2 is equivalent to the sixth controlled switch, the third MOSFET Q3 is equivalent to the second controlled switch, the fourth MOSFET Q4 is equivalent to the third controlled switch, the fifth MOSFET Q5 is equivalent to the first controlled switch, the on / off logic control unit 1211 is equivalent to the first control unit, and the rectifier control unit 1221 is equivalent to the second control unit. Their functions are the same as those in the above embodiments and will not be described again here.

[0093] In one embodiment, referring to Figure 12, which shows a fifth schematic diagram of the switching control circuit 100 in this embodiment, the switching control circuit 100 includes an on / off logic control unit 1211, a rectification control unit 1221, a first MOSFET Q1, a second MOSFET Q2, a third MOSFET Q3, a fifth MOSFET Q5, and a sixth MOSFET Q6. The gates of the first MOSFET Q1, second MOSFET Q2, third MOSFET Q3, fifth MOSFET Q5, and sixth MOSFET Q6 are all connected to the on / off logic control unit 1211. The source of the first MOSFET Q1 is connected to the filter of the first AC-DC conversion circuit 210. The filter is connected to the first output port 212. The drain of the first MOSFET Q1 is connected to the drain of the second MOSFET Q2. The source of the second MOSFET Q2 is connected to the source of the sixth MOSFET Q6 and the second output port 222#1 in the second AC-DC conversion circuit 220. The source of the third MOSFET Q3 is connected to the filter in the second AC-DC conversion circuit 220. The drain of the third MOSFET Q3 is connected to the drain of the sixth MOSFET Q6. The source of the fifth MOSFET 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 fifth MOSFET Q5 is connected to the source of the third MOSFET 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 demand at the first output port 212 but a power output demand at the second output port 222, the on / off logic control unit 1211 controls the first MOSFET Q1 and the second MOSFET Q2 to turn on, controls the third MOSFET Q3 and the sixth MOSFET Q6 to turn off, and controls the fifth MOSFET Q5 to turn on. Simultaneously, when there is no power output demand at the first output port 212 but a power output demand at the second output port 222, the rectifier control unit 1221 is also controlled to ensure the rectifier in the second AC-DC conversion circuit 220 operates normally, enabling the connection between the second output port 222#1 and the filter of the first AC-DC conversion circuit, thus allowing the second output port 222#1 to transmit the first output signal. Simultaneously, the second output ports 222#2 and 222#3 are connected to the filters of the second AC-DC conversion circuit, allowing the second output ports 222#2 and 222#3 to simultaneously transmit the second output signal.

[0094] In this embodiment, the first MOSFET Q1 is equivalent to the fifth controlled switch, the second MOSFET Q2 is equivalent to the sixth controlled switch, the third MOSFET Q3 is equivalent to the second controlled switch, the fifth MOSFET Q5 is equivalent to the first controlled switch, the sixth MOSFET Q6 is equivalent to the fourth controlled switch, the on / off logic control unit 1211 is equivalent to the first control unit, and the rectifier control unit 1221 is equivalent to the second control unit. Their functions are the same as those in the above embodiments and will not be described again here.

[0095] In one embodiment, a switching power supply is also provided. The switching power supply in this embodiment includes an AC-DC conversion module and a switching control circuit as described in any of the above embodiments. 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 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.

[0096] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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, they should be considered to be within the scope of this specification.

[0097] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. 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 comprising a first output assembly connected with a secondary coil, and a first output port connected with the first output assembly; the second AC-DC conversion circuit comprising a second output assembly connected with a secondary coil, and a second output port connected with the second output assembly; 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 comprises: a switch module connected with the first output component, the first output port, the second output component and the second output port respectively; a control module connected with the switch module, configured to control the switch module to turn on the connection between the first output component and the second output port when there is no power output demand for the first output port and there is power output demand for the second output port, so that the first output signal is transmitted through the second output port.

2. The switching control circuit of claim 1, wherein, The control module is further configured to control the switch module to turn off the connection between the second output component and the first output component and the second output port when there is no power output demand for the first output port and there is power output demand for the second output port.

3. The switching control circuit of claim 2, wherein, The switch module comprises: a first switch unit connected with the first output component, the first output port, the second output port and the control module respectively; a second switch unit connected with the second output component, the first switch unit, the second output port and the control module respectively; The control module is configured to control the first switch unit to turn on the connection between the first output component and the second output port and control the second switch unit to turn off the connection between the second output component and the second output port when there is no power output demand for the first output port and there is power output demand for the second output port.

4. The switching control circuit of claim 3, wherein, The second switch unit comprises at least one controlled switch.

5. The switching control circuit of claim 4, wherein, When the second switch unit comprises a plurality of controlled switches, the number of the second output ports is a plurality.

6. The switching control circuit of claim 5, wherein, The second switch unit comprises: a first controlled switch, a first end of the first controlled switch being connected with part of the second output ports, a second end of the first controlled switch being connected with the second output component, a controlled end of the first controlled switch being connected with the control module; a second controlled switch, a first end of the second controlled switch being connected with the second output component, a second end of the second controlled switch being connected with the first switch unit and the rest of the second output ports, a controlled end of the second controlled switch being connected with the control module; the rest of the second output ports are output ports other than part of the second output ports in the plurality of second output ports; The control module is further configured to control the first controlled switch to turn on or turn off and control the second controlled switch to turn off the connection between the second output component and the first output component and the rest of the second output ports when there is no power output demand for the first output port and there is power output demand for the second output port.

7. The switching control circuit of claim 6, wherein, The second switch unit further comprises: a third controlled switch, a first end of the third controlled switch being connected with the first end of the first controlled switch, a second end of the third controlled switch being connected with the rest of the second output ports and the second end of the second controlled switch, a controlled end of the third controlled switch being connected with 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 there is no power output demand at the first output port and there is power output demand at the second output port.

8. The switching control circuit according to claim 6 or 7, wherein The second switch unit further comprises: A fourth controlled switch, a first end of the fourth controlled switch being connected with the second output port, a second end of the fourth controlled switch being connected with the second end of the second controlled switch, a controlled end of the fourth controlled switch being connected with the control module, the fourth controlled switch being configured to disconnect the second controlled switch from the rest of the second output port under the control of the control module.

9. The switching control circuit according to any one of claims 3 to 7, wherein The control module is further connected with the second output assembly, and the control module is further configured to control the second output assembly to normally work or stop working when there is no power output demand at the first output port and there is power output demand at the second output port.

10. The switching control circuit of claim 9, wherein, The number of the second output ports is plural; when there is no power output demand at the first output port and the power output demands of the plural second output ports are different, the control module controls the second switch unit to connect the second output assembly with part of the second output ports and to disconnect the second output assembly from the rest of the second output ports, and controls the second output assembly to normally work; Wherein, the power output demand of part of the second output ports is less than that of the rest of the second output ports.

11. The switching control circuit of claim 9, wherein, The control module comprises: A first control unit, connected with the switch module, configured to control the switch module to connect the first output assembly with the second output port when there is no power output demand at the first output port and there is power output demand at the second output port; A second control unit, connected with the first control unit and the second output assembly respectively; The first control unit is further configured to control the second control unit to control the second output assembly to normally work or stop working when there is no power output demand at the first output port and there is power output demand at the second output port.

12. The switching control circuit of claim 1, wherein, The switch module comprises: A first switch unit, connected with the first output assembly, the first output port, the second output assembly, the second output port and the control module respectively; The control module is further connected with the second output assembly, configured to control the first switch unit to connect the first output assembly with the second output port and control the second output assembly to stop working when there is no power output demand at the first output port and there is power output demand at the second output port.

13. The switching control circuit according to claim 3 or 12, wherein The first switch unit comprises at least one controlled switch, when the first switch unit comprises two controlled switches, the first switch unit comprises: A fifth controlled switch, a first end of the fifth controlled switch being connected with the first output assembly and the first output port, a controlled end of the fifth controlled switch being connected with the control module, the fifth controlled switch being turned on under the control of the control module; A sixth controlled switch, a first end of the sixth controlled switch is connected with the second output port, a second end of the sixth controlled switch is connected with a second end of the fifth controlled switch, the sixth controlled switch is turned on under the control of the control module.

14. The switching control circuit of claim 1, wherein, The switching control circuit comprises a turn-on and turn-off logic control unit, a rectification control unit, a first MOS tube, a second MOS tube and a third MOS tube, the gates of the first MOS tube, the second MOS tube and the third MOS tube are connected with the turn-on and turn-off logic control unit, the source of the first MOS tube is connected with the filter of the first AC-DC conversion circuit and the first output port, the drain of the first MOS tube is connected with the drain of the second MOS tube, the source of the second MOS tube is connected with the drain of the third MOS tube, the drain of the third MOS tube is also connected with the second output port, and the source of the third MOS tube is connected with the filter of the second AC-DC conversion circuit.

15. The switching control circuit of claim 1, wherein, The switching control circuit comprises a turn-on and turn-off logic control unit, a rectification control unit, a first MOS tube, a second MOS tube, a third MOS tube, a fourth MOS tube and a fifth MOS tube, the gates of the first MOS tube, the second MOS tube, the third MOS tube, the fourth MOS tube and the fifth MOS tube are connected with the turn-on and turn-off logic control unit, the source of the first MOS tube is connected with the filter of the first AC-DC conversion circuit and the first output port, the drain of the first MOS tube is connected with the drain of the second MOS tube, the source of the second MOS tube is connected with the drain of the fourth MOS tube, the source of the second MOS tube is also connected with the second output port of the second AC-DC conversion circuit, the source of the third MOS tube is connected with the filter of the second AC-DC conversion circuit, the source of the fourth MOS tube is connected with the second output port of the second AC-DC conversion circuit and the source of the fifth MOS tube respectively, the drain of the third MOS tube is connected with the second output port of the second AC-DC conversion circuit and the source of the second MOS tube respectively, and the drain of the fifth MOS tube is connected with the filter of the second AC-DC conversion circuit and the source of the third MOS tube. The turn-on and turn-off logic control unit is connected with the rectification control unit, and the rectification control unit is connected with the rectifier of the second AC-DC conversion circuit.

16. The switching control circuit of claim 1, wherein, The switching control circuit comprises a on-off logic control unit, a rectification control unit, a first MOS transistor, a second MOS transistor, a third MOS transistor, a fifth MOS transistor and a sixth MOS transistor, the gates of the first MOS transistor, the second MOS transistor, the third MOS transistor, the fifth MOS transistor and the sixth MOS transistor are connected with the on-off logic control unit, the source of the first MOS transistor is connected with a filter of the first AC-DC conversion circuit and the first output port, the drain of the first MOS transistor is connected with the drain of the second MOS transistor, the source of the second MOS transistor is connected with the source of the sixth MOS transistor and the second output port of the second AC-DC conversion circuit, the source of the third MOS transistor is connected with a filter of the second AC-DC conversion circuit, the drain of the third MOS transistor is connected with the drain of the sixth MOS transistor, the source of the fifth MOS transistor is connected with the second output port of the second AC-DC conversion circuit, the drain of the fifth MOS transistor is connected with the source of the third MOS transistor, the on-off logic control unit is connected with the rectification control unit, and the rectification control unit is connected with a rectifier of the second AC-DC conversion circuit.

17. A switching power supply, comprising: an AC-DC conversion module comprising at least a first AC-DC conversion circuit and a second AC-DC conversion circuit; and a switching control circuit according to any one of claims 1 to 16, the switching control circuit being connected with the first AC-DC conversion circuit and the second AC-DC conversion circuit respectively to output an output signal of the first AC-DC conversion circuit through a second output port of the second AC-DC conversion circuit.

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