Dual-path output control circuit and dual-path output system

Abstract

The utility model relates to a dual-path output control circuit and a dual-path output system.The dual-path output system comprises a first power circuit and a second power circuit, the dual-path output control circuit comprises a first detection unit, a second detection unit, a control unit and a switch unit, the first detection unit is connected to the output end of the first power circuit, and the second detection unit is connected to the output end of the second power circuit; the second detection unit is connected to the output end of the second power circuit, the switch unit is connected to the output end of the first power circuit and the output end of the second power circuit, and the control unit is connected with the first detection unit, the second detection unit and the switch unit. The control unit is configured to control the switching state of the switching unit based on the current value of the first detection unit or the second detection unit so that the first power circuit and the second power circuit output electric energy at the same time. According to the invention, intelligent current sharing control and power superposition can be realized, the cost is low, and the heat dissipation performance is good.

Description

Technical Field

[0001] This application relates to the field of switching circuit technology, and in particular to a dual-output control circuit and a dual-output system. Background Technology

[0002] Traditional power supply or charging systems typically employ a single-output or independent dual-output architecture, with each power circuit operating independently without current sharing control. This design is prone to overload risks when the load demand on a single circuit exceeds its maximum power, and its limited output capacity makes it difficult to meet the demands of high-power applications. Furthermore, prolonged single-circuit operation under load can lead to localized overheating of internal components (such as MOSFETs and inductors), accelerating hardware aging and thus reducing system reliability. Utility Model Content

[0003] In view of the above, it is necessary to provide a dual-output control circuit and a dual-output system that can realize intelligent current sharing control and power superposition, and has low cost and good heat dissipation performance.

[0004] This application first provides a dual-output control circuit for use in a dual-output system. The dual-output system includes a first power circuit and a second power circuit. The dual-output control circuit includes a first detection unit, a second detection unit, a control unit, and a switching unit. The first detection unit is connected to the output terminal of the first power circuit, the second detection unit is connected to the output terminal of the second power circuit, the switching unit is connected to the output terminals of the first power circuit and the second power circuit, and the control unit is connected to the first detection unit, the second detection unit, and the switching unit. The control unit is configured to control the switching state of the switching unit based on the current value of the first detection unit or the second detection unit so that the first power circuit and the second power circuit can output electrical energy simultaneously.

[0005] In the dual-output control circuit of this application, intelligent current sharing control of the dual-output system can be achieved by dynamically coordinating the first detection unit, the second detection unit, the control unit, and the switching unit. When the load current of any output terminal (such as the first power circuit) reaches a threshold, the control unit triggers the other channel (the second power circuit) to work collaboratively based on the detection signal, enabling both channels to output power simultaneously, thereby achieving power superposition of the dual-output system. Furthermore, through dual detection and switching state regulation, the losses from redundant operation of multiple channels under light loads are avoided, and the overall output capacity of the system is significantly improved. In addition, dynamic current sharing in both channels can disperse the thermal stress of the power devices in the dual outputs, improving local overheating problems, thereby enhancing overall lifespan and reliability. The dual-output control circuit of this application is low-cost, easy to integrate, and suitable for various application scenarios such as industrial power supplies and communication equipment.

[0006] In some embodiments, the switching unit includes a first switching transistor and a second switching transistor. The first end of the first switching transistor is connected to the first signal terminal of the control unit, the first end of the second switching transistor is connected to the second signal terminal of the control unit, the second end of the first switching transistor and the second end of the second switching transistor are connected, the third end of the first switching transistor is connected to the output terminal of the first power circuit, and the third end of the second switching transistor is connected to the output terminal of the second power circuit.

[0007] In some embodiments, the first terminal of the first switching transistor is connected to the first signal terminal of the control unit through a first resistor; the first terminal of the second switching transistor is connected to the second signal terminal of the control unit through a second resistor.

[0008] In some embodiments, a third resistor is connected in parallel between the first terminal of the first switching transistor and the second terminal of the first switching transistor; a fourth resistor is connected in parallel between the first terminal of the second switching transistor and the second terminal of the second switching transistor.

[0009] In some embodiments, a fifth resistor is connected in series between the second terminal of the first switching transistor and the second terminal of the second switching transistor.

[0010] In some embodiments, the output terminal of the first power circuit is connected to a first serial interface, and the first detection unit is at least connected to the ground terminal of the first serial interface.

[0011] In some embodiments, the first detection unit includes a sixth resistor, one side of which is connected to the ground terminal of the first serial interface and the other side is grounded. The control unit is configured to control the switching state of the switching unit based on the current value of the sixth resistor.

[0012] In some embodiments, the output terminal of the second power circuit is connected to a second serial interface, and the second detection unit is at least connected to the ground terminal of the second serial interface.

[0013] In some embodiments, the second detection unit includes a seventh resistor, one side of which is connected to the ground terminal of the second serial interface and the other side is grounded. The control unit is configured to control the switching state of the switching unit based on the current value of the seventh resistor.

[0014] This application also provides a dual-output system, including a first power circuit, a second power circuit, and a dual-output control circuit according to any embodiment of this application; the first power circuit includes a first input unit, a first EMI unit, a first rectifier unit, a first power conversion unit, a second rectifier unit, a first output unit, a first feedback unit, and a first PWM control unit connected in sequence, the first PWM control unit is also connected to the first power conversion unit, and the dual-output control circuit is connected to the first output unit; the second power circuit includes a second input unit, a second EMI unit, a third rectifier unit, a second power conversion unit, a fourth rectifier unit, a second output unit, a second feedback unit, and a second PWM control unit connected in sequence, the second PWM control unit is also connected to the second power conversion unit, and the dual-output control circuit is connected to the second output unit.

[0015] In the dual-output system of this application, the signal quality of the dual outputs can be ensured through EMI filtering, PWM control and feedback control, and system-level coordination can be achieved by combining current sharing control. This allows it to be compatible with high-noise environments, support high-power and high-efficiency output, and expand industrial application scenarios. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure and application scenario of the dual-output control circuit according to an embodiment of this application.

[0017] Figure 2 This is a schematic diagram of the structure of the switching unit in an embodiment of this application and its connection relationship with the control unit, the first power circuit and the second power circuit.

[0018] Figure 3 This is a schematic diagram of the structure of the first detection unit in an embodiment of this application and its connection relationship with the control unit, the first power circuit and the second power circuit.

[0019] Figure 4 This is a schematic diagram of the structure of the second detection unit in an embodiment of this application and its connection relationship with the control unit, the first power circuit and the second power circuit.

[0020] Figure 5 This is a schematic diagram of the structure of the dual-output system according to an embodiment of this application and the electrical connections of its internal units.

[0021] Explanation of key component symbols:

[0022] 1. Dual-output system; 10. Dual-output control circuit; 11. First power circuit; 12. Second power circuit; 101. First detection unit; 102. Second detection unit; 103. Control unit; 104. Switching unit; 110. First serial interface; 120. Second serial interface; 111. First input unit; 112. First EMI unit; 113. First rectification unit; 114. First power conversion unit; 115. Second rectification unit; 116. First output unit; 117. First feedback unit; 118. First PWM control unit; 121. Second input unit; 122. Second EMI unit; 123. Third rectification unit; 124. Second power conversion unit; 125. Fourth rectification unit; 126. Second output unit; 127. Second feedback unit; 128. Second PWM control unit.

[0023] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0024] In the description of the embodiments in this application, the words "exemplary," "or," and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design schemes. Specifically, the use of the words "exemplary," "or," and "for example" is intended to present the relevant concepts in a specific manner.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terminology used in this application's specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. It should be understood that, unless otherwise stated, " / " in this application means "or". For example, A / B can mean A or B. "And / or" in this application is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. "At least one" refers to one or more. "More than one" refers to two or more. For example, at least one of a, b, or c can represent: a, b, c, a and b, a and c, b and c, and a, b, and c (seven cases).

[0026] It should also be noted that the terms "first" and "second" in the specification, claims and drawings of this application are used to distinguish similar objects, rather than to describe a specific order or sequence.

[0027] In the field of power electronics, power supply systems and charging systems are the core components of energy conversion and distribution. Traditional power supply and charging systems typically employ a single-output architecture or an independent dual-output architecture. While these designs can meet basic requirements in fundamental application scenarios, they are ill-suited to the modern trends of high power, high reliability, and intelligence.

[0028] In a single-output architecture, input power is output to the load through a single power conversion link (such as rectification-inverter-filter). The maximum output power of this design is easily limited to the capacity of a single power module. When load demand suddenly increases (e.g., fast charging of electric vehicles or a sudden surge in power consumption by data center servers), overload protection is easily triggered, potentially leading to hardware damage. To alleviate this problem, some scenarios employ an independent dual-output architecture, using two completely independent power modules to drive different loads. However, the lack of a coordinated control mechanism between the two outputs means they remain essentially two isolated systems. This not only results in hardware redundancy (inefficiency under light loads) but also prevents the single-output capacity from being exceeded through power aggregation. For example, when one output approaches its maximum power, the other remains idle, unable to share the load burden, making it difficult to improve the overall system efficiency and reliability.

[0029] Furthermore, energy losses during power conversion are concentrated as heat in critical components such as MOSFETs, high-frequency transformers, and energy storage inductors. During prolonged full-load operation of a single circuit, localized temperature rises may exceed the component's tolerance limits, leading to thermal failure or performance degradation. Even with intervention through heat dissipation designs (such as fans and heat sinks), it is difficult to avoid material fatigue caused by uneven temperature distribution, ultimately shortening the system's lifespan. For example, in industrial frequency converters or communication base station power supplies, MOSFET burnout due to prolonged high-load operation of power modules is very common.

[0030] Therefore, this application provides a dual-output control circuit and a dual-output system, which can achieve intelligent current sharing control and power superposition, and has low cost and good heat dissipation performance. Some embodiments will be described below with reference to the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0031] Figure 1 This is a schematic diagram of the structure and application scenario of the dual-output control circuit 10 according to an embodiment of this application.

[0032] like Figure 1 As shown, this application first provides a dual-output control circuit 10, which can be applied to, for example... Figure 5In the dual-output system 1 shown, the dual-output system 1 may include a first power circuit 11 and a second power circuit 12. The dual-output control circuit 10 includes a first detection unit 101, a second detection unit 102, a control unit 103, and a switching unit 104. The first detection unit 101 is connected to the output terminal of the first power circuit 11, the second detection unit 102 is connected to the output terminal of the second power circuit 12, and the switching unit 104 is connected to the output terminals of the first power circuit 11 and the second power circuit 12. The control unit 103 is connected to the first detection unit 101, the second detection unit 102, and the switching unit 104. The control unit 103 is configured to control the switching state of the switching unit 104 based on the current value of the first detection unit 101 or the second detection unit 102 so that the first power circuit 11 and the second power circuit 12 output electrical energy simultaneously. In this case, by real-time monitoring of the current of a single circuit (such as the first power circuit 11) to trigger the output of another circuit (such as the second power circuit 12), and by using the state switching of the switching unit 104 to achieve current sharing between the two circuits, the maximum output power of a single circuit under load can be increased, and the heat generation can be balanced, reducing the risk of overload and achieving cost-effectiveness.

[0033] Figure 2 This is a schematic diagram of the structure of the switching unit 104 in this application embodiment and its connection relationship with the control unit 103, the first power circuit 11 and the second power circuit 12.

[0034] In some embodiments, such as Figure 2 As shown, the switching unit 104 may include a first switching transistor M1 and a second switching transistor M2. The first terminal of the first switching transistor M1 can be connected to the first signal terminal of the control unit 103, the first terminal of the second switching transistor M2 can be connected to the second signal terminal of the control unit 103, the second terminal of the first switching transistor M1 can be connected to the second terminal of the second switching transistor M2, the third terminal of the first switching transistor M1 can be connected to the output terminal of the first power circuit 11, and the third terminal of the second switching transistor M2 can be connected to the output terminal of the second power circuit 12. The first terminal of the first switching transistor M1 and the second switching transistor M2 can be the gate, the second terminal can be the source, and the third terminal can be the drain. In this configuration, the switching unit 104 independently controls the two output states with dual switching transistors, ensuring independent adjustability of both outputs, reducing control signal crosstalk, enhancing system reliability, and adapting to complex load scenarios. Furthermore, by independently controlling the two outputs with discrete switching transistors, the dual signals can be isolated and complementary drive can be achieved, thereby simplifying circuit design and improving switching response speed.

[0035] In some embodiments, such as Figure 2As shown, the first terminal of the first switch M1 can be connected to the first signal terminal of the control unit 103 through the first resistor R1; the first terminal of the second switch M2 can be connected to the second signal terminal of the control unit 103 through the second resistor R2. In this case, the current limiting by the first resistor R1 and the second resistor R2 can protect the first switch M1 and the second switch M2, optimize or enhance the signal strength to avoid false triggering, improve the response accuracy of the first switch M1 and the second switch M2, and extend the device life.

[0036] In some embodiments, such as Figure 2 As shown, a third resistor R3 can be connected in parallel between the first terminal and the second terminal of the first switching transistor M1; a fourth resistor R4 can be connected in parallel between the first terminal and the second terminal of the second switching transistor M2. In this case, the parallel resistors can absorb the residual current when the switching transistors are turned off, reduce voltage spikes, thereby suppressing electromagnetic interference, reducing component stress, and improving EMC performance. That is, by providing a discharge path for the switching transistors through the parallel resistors, the accumulated charge of the parasitic capacitance of the switching transistors can be eliminated, thereby reducing false triggering and enhancing the anti-interference capability of the switching transistors.

[0037] In some embodiments, such as Figure 2 As shown, a fifth resistor R5 can be connected in series between the second terminal of the first switching transistor M1 and the second terminal of the second switching transistor M2. In this case, the fifth resistor R5 can balance the two output impedances, optimize the current sharing accuracy, thereby reducing the current deviation between the two paths, further balancing heat generation and power distribution. At the same time, by forcibly distributing the current between the two paths through the fifth resistor R5, the adjustment pressure of the control unit 103 can be reduced during the initial current sharing, thus improving the dynamic response efficiency of the control unit 103.

[0038] Figure 3 This is a schematic diagram of the structure of the first detection unit 101 in an embodiment of this application and its connection relationship with the control unit 103, the first power circuit 11 and the second power circuit 12. Figure 4 This is a schematic diagram of the structure of the second detection unit 102 in an embodiment of this application and its connection relationship with the control unit 103, the first power circuit 11 and the second power circuit 12.

[0039] In some embodiments, such as Figure 3 As shown, the output terminal of the first power circuit 11 can be connected to the first serial interface 110, and the first detection unit 101 can be connected to at least the ground terminal of the first serial interface 110. In this case, the ground terminal series detection can more directly reflect the load current change, thereby improving the detection sensitivity, simplifying the layout design, reducing the cost of the detection circuit, and adapting to the standard interface design.

[0040] In some embodiments, such as Figure 3 As shown, the first detection unit 101 may include a sixth resistor R6. One side of the sixth resistor R6 may be connected to the ground terminal of the first serial interface 110, and the other side may be grounded. The control unit 103 may be configured to control the switching state of the switching unit 104 based on the current value of the sixth resistor R6. In this case, the detection signal is generated by utilizing the linear relationship between the current and voltage drop of the sixth resistor R6, which is low in cost, has high output stability, and is easy to mass-produce.

[0041] In some embodiments, such as Figure 3 As shown, the first detection unit 101 may also include a resistor Rf and a capacitor C1. The resistor Rf can limit the current input to the control unit 103, thereby protecting the control unit 103 and extending its service life. The capacitor C1 can filter the signal input to the control unit 103, thereby improving the reliability of the signal.

[0042] In addition, the first serial interface 110 can be at least partially connected to the control unit 103, thereby the control unit 103 can manage the first power circuit 11 to perform functions such as charging externally through the first power circuit 11.

[0043] In some embodiments, such as Figure 3 As shown, multiple resistors Rx can be provided between the first serial interface 110 and the control unit 103. The resistors Rx can limit the current input to the control unit 103, thereby protecting the control unit 103 and extending its service life. Additionally, multiple capacitors Cx connected to the ground point can be provided between the first serial interface 110 and the control unit 103. The capacitors Cx can filter the signals input to the control unit 103, thereby improving signal reliability.

[0044] Similar to the first power circuit 11 and the first detection unit 101, in some embodiments, such as Figure 4 As shown, the output terminal of the second power circuit 12 can also be connected to the second serial interface 120, and the second detection unit 102 is at least connected to the ground terminal of the second serial interface 120. The second detection unit 102 may also include a seventh resistor R7, one side of which can be connected to the ground terminal of the second serial interface 120 and the other side grounded. The control unit 103 can be configured to control the switching state of the switching unit 104 based on the current value of the seventh resistor R7. In this case, by covering two implementation schemes, the symmetry of the two-way design can be ensured, and the dual-channel independent sampling can improve the system's fault tolerance, thereby reducing the risk of single-point failure and improving system robustness.

[0045] In addition, the second serial interface 120 can also be at least partially connected to the control unit 103, thereby allowing the control unit 103 to manage the second power circuit 12 for functions such as charging externally via the second power circuit 12.

[0046] In some embodiments, such as Figure 4 As shown, multiple resistors Rx can be provided between the second serial interface 120 and the control unit 103. The resistors Rx can limit the current input to the control unit 103, thereby protecting the control unit 103 and extending its service life. Additionally, multiple capacitors Cx connected to the ground point can be provided between the second serial interface 120 and the control unit 103. The capacitors Cx can filter the signals input to the control unit 103, thereby improving signal reliability.

[0047] In the dual-output control circuit 10 of this application, intelligent current sharing control of the dual-output system 1 can be achieved by dynamically coordinating the first detection unit 101, the second detection unit 102, the control unit 103, and the switching unit 104. When the load current of any output terminal (such as the first power circuit 11) reaches a threshold, the control unit 103 triggers the other path (the second power circuit 12) to work collaboratively based on the detection signal, enabling both paths to output power simultaneously, thereby achieving power superposition of the dual-output system 1. Furthermore, through dual detection and switching state regulation, the losses from redundant operation of multiple paths under light loads are avoided, and the total output capacity of the system is significantly improved. In addition, dynamic current sharing of the dual paths can disperse the thermal stress of the power devices in the dual outputs, improve the problem of local overheating, and thus improve the overall lifespan and reliability. The dual-output control circuit 10 of this application is low in cost, easy to integrate, and adaptable to various application scenarios such as industrial power supplies and communication equipment.

[0048] Figure 5 This is a schematic diagram of the structure of the dual-output system 1 according to an embodiment of this application and the electrical connections of its internal units.

[0049] like Figure 5As shown, this application also provides a dual-output system 1, including a first power circuit 11, a second power circuit 12, and a dual-output control circuit 10 of any of the above embodiments of this application; the first power circuit 11 includes a first input unit 111, a first EMI unit 112, a first rectification unit 113, a first power conversion unit 114, a second rectification unit 115, a first output unit 116, a first feedback unit 117, and a first PWM control unit 118 connected in sequence, the first PWM control unit 118 is also connected to the first power conversion unit 114, and the dual-output control circuit 10 is connected to the first output unit 116; the second power circuit 12 includes a second input unit 121, a second EMI unit 122, a third rectification unit 123, a second power conversion unit 124, a fourth rectification unit 125, a second output unit 126, a second feedback unit 127, and a second PWM control unit 128 connected in sequence, the second PWM control unit 128 is also connected to the second power conversion unit 124, and the dual-output control circuit 10 is connected to the second output unit 126.

[0050] The first input unit 111 and the second input unit 121 can be used for AC input; the first EMI unit 112 and the second EMI unit 122 can be used for EMI (electromagnetic interference) cancellation; the first rectifier unit 113, the second rectifier unit 115, the third rectifier unit 123 and the fourth rectifier unit 125 can be used for rectifying and filtering AC power; the first power conversion unit 114 and the second power conversion unit 124 can be used for power conversion; the first output unit 116 and the second output unit 126 can be used for outputting DC power; the first feedback unit 117 can be used to detect the magnitude of the DC power of the first output unit 116 and feed it back to the first PWM control unit 118; the first PWM control unit 118 can be used to control the power conversion process of the first power conversion unit 114; the second feedback unit 127 can be used to detect the magnitude of the DC power of the second output unit 126 and feed it back to the second PWM control unit 128; the second PWM control unit 128 can be used to control the power conversion process of the second power conversion unit 124. In addition, the first output unit 116 may be provided with the first serial interface 110 as described above, and the second output unit 126 may be provided with the second serial interface 120 as described above.

[0051] In the dual-output system 1 of this application, the signal quality of the dual outputs can be ensured through EMI (Electromagnetic Interference) filtering, PWM (Pulse width modulation) control and feedback control, and system-level coordination can be achieved by combining current sharing control. This allows it to be compatible with high-noise environments, support high-power and high-efficiency output, and expand industrial application scenarios.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application.

Claims

1. A dual-output control circuit, applied to a dual-output system, the dual-output system comprising a first power circuit and a second power circuit, characterized in that, The dual-output control circuit includes a first detection unit, a second detection unit, a control unit, and a switching unit. The first detection unit is connected to the output terminal of the first power circuit, the second detection unit is connected to the output terminal of the second power circuit, the switching unit is connected to the output terminals of the first power circuit and the second power circuit, and the control unit is connected to the first detection unit, the second detection unit, and the switching unit. The control unit is configured to control the switching state of the switching unit based on the current value of the first detection unit or the second detection unit so that the first power circuit and the second power circuit output electrical energy simultaneously.

2. The dual-output control circuit according to claim 1, characterized in that, The switching unit includes a first switching transistor and a second switching transistor. The first end of the first switching transistor is connected to the first signal terminal of the control unit, the first end of the second switching transistor is connected to the second signal terminal of the control unit, the second ends of the first switching transistor and the second end of the second switching transistor are connected, the third end of the first switching transistor is connected to the output terminal of the first power circuit, and the third end of the second switching transistor is connected to the output terminal of the second power circuit.

3. The dual-output control circuit according to claim 2, characterized in that, The first terminal of the first switching transistor is connected to the first signal terminal of the control unit through a first resistor; the first terminal of the second switching transistor is connected to the second signal terminal of the control unit through a second resistor.

4. The dual-output control circuit according to claim 2, characterized in that, A third resistor is connected in parallel between the first terminal of the first switching transistor and the second terminal of the first switching transistor; a fourth resistor is connected in parallel between the first terminal of the second switching transistor and the second terminal of the second switching transistor.

5. The dual-output control circuit according to claim 2, characterized in that, A fifth resistor is connected in series between the second terminal of the first switching transistor and the second terminal of the second switching transistor.

6. The dual-output control circuit according to claim 1, characterized in that, The output terminal of the first power circuit is connected to a first serial interface, and the first detection unit is at least connected to the ground terminal of the first serial interface.

7. The dual-output control circuit according to claim 6, characterized in that, The first detection unit includes a sixth resistor, one side of which is connected to the ground terminal of the first serial interface and the other side is grounded. The control unit is configured to control the switching state of the switching unit based on the current value of the sixth resistor.

8. The dual-output control circuit according to claim 1, characterized in that, The output terminal of the second power circuit is connected to a second serial interface, and the second detection unit is at least connected to the ground terminal of the second serial interface.

9. The dual-output control circuit according to claim 8, characterized in that, The second detection unit includes a seventh resistor, one side of which is connected to the ground terminal of the second serial interface and the other side is grounded. The control unit is configured to control the switching state of the switching unit based on the current value of the seventh resistor.

10. A dual-output system, characterized in that, The system includes a first power circuit, a second power circuit, and a dual-output control circuit as described in any one of claims 1 to 9. The first power circuit includes a first input unit, a first EMI unit, a first rectifier unit, a first power conversion unit, a second rectifier unit, a first output unit, a first feedback unit, and a first PWM control unit connected in sequence. The first PWM control unit is also connected to the first power conversion unit, and the dual-output control circuit is connected to the first output unit. The second power circuit includes a second input unit, a second EMI unit, a third rectifier unit, a second power conversion unit, a fourth rectifier unit, a second output unit, a second feedback unit, and a second PWM control unit connected in sequence. The second PWM control unit is also connected to the second power conversion unit, and the dual-output control circuit is connected to the second output unit.

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