Common mode interference suppression circuit and device

Abstract

The utility model belongs to the technical field of power electronics, and relates to a common-mode interference suppression circuit and device. The common-mode interference suppression circuit comprises an AC conversion module, a common-mode module, a DC conversion module and a control module. The control module is used for collecting current and voltage in the alternating current conversion module and outputting a first driving signal, and collecting current and voltage in the direct current conversion module and outputting a second driving signal; the alternating current conversion module is used for rectifying and boosting alternating current output by an alternating current power supply when receiving the first driving signal so as to obtain high-voltage direct current; the common-mode module is used for attenuating common-mode interference generated when the alternating-current conversion module works; and the direct current conversion module is used for converting the high-voltage direct current to obtain low-voltage direct current when receiving the second driving signal. According to the invention, common-mode interference can be effectively suppressed, noise and electromagnetic interference in the power supply are reduced, the stability and purity of output direct current are improved, and a more reliable power supply is provided for a rear-end load.

Description

Technical Field

[0001] This application relates to the technical field of circuit electronics, and specifically relates to a common-mode interference suppression circuit and device. Background Art

[0002] With the rapid development of switching power supply technology, high efficiency and high power density have become a development trend of switching power supplies. As the power of the power supply increases, common-mode interference is a major and difficult problem to handle.

[0003] Currently, high-power power supplies only have common-mode interference suppression circuits in the input filter and output filter, and use a two-stage topology of Vienna PFC (Power Factor Correction) and DCDC (DC-to-DC conversion) directly connected. For a three-phase six-switch two-level topology, the voltage across the inductor fluctuates at 1 / 3Vpfc, resulting in relatively large common-mode interference. The common-mode current forms a loop through the output Y capacitor, affecting the sampling of the input voltage, current, etc., affecting the logic function, and even causing the program to go wrong and damaging the chip, reducing the overall reliability of the power supply. Utility Model Content

[0004] The embodiments of this application provide a common-mode interference suppression circuit and device, which can effectively suppress common-mode interference, reduce noise and electromagnetic interference in the power supply, improve the stability and purity of the output direct current, and provide a more reliable and high-quality power supply for the backend load.

[0005] In a first aspect, the embodiments of this application provide a common-mode interference suppression circuit, including: an AC conversion module, a common-mode module, a DC conversion module, and a control module; the input end of the AC conversion module is connected to an AC power supply, the output end of the AC conversion module is connected to the input end of the common-mode module, the output end of the common-mode module is connected to the input end of the DC conversion module, and the control ends of the AC conversion module and the DC conversion module are respectively connected to the control module; the control module is used to collect the current and voltage in the AC conversion module and output a first driving signal, and collect the current and voltage in the DC conversion module and output a second driving signal; the AC conversion module is used to rectify and boost the alternating current output by the AC power supply to obtain high-voltage direct current when receiving the first driving signal; the common-mode module is used to attenuate the common-mode interference generated when the AC conversion module works; the DC conversion module is used to convert the high-voltage direct current to obtain low-voltage direct current when receiving the second driving signal.

[0006] In some embodiments, the AC conversion module includes an inductor LA, an inductor LB, an inductor LC, a switching transistor Q1, a switching transistor Q2, a switching transistor Q3, a switching transistor Q4, a switching transistor Q5, and a switching transistor Q6. The first ends of the inductor LA, the inductor LB, and the inductor LC are all connected to the AC power supply. The second end of the inductor LA is connected to the second end of the switching transistor Q1 and the first end of the switching transistor Q2. The second end of the inductor LB is connected to the second end of the switching transistor Q3 and the first end of the switching transistor Q4. The second end of the inductor LC is connected to the second end of the switching transistor Q5 and the first end of the switching transistor Q6. The first ends of the switching transistor Q1, the switching transistor Q3, and the switching transistor Q5 are all connected to the first input end of the common mode module. The second ends of the switching transistor Q2, the switching transistor Q4, and the switching transistor Q6 are all connected to the second input end of the common mode module. The control ends of the switching transistor Q1, the switching transistor Q2, the switching transistor Q3, the switching transistor Q4, the switching transistor Q5, and the switching transistor Q6 are all connected to the control module.

[0007] In some embodiments, the common mode module includes an inductor L101. The first input end of the inductor L101 is connected to the first output end of the AC conversion module. The second input end of the inductor L101 is connected to the second output end of the AC conversion module. The first output end of the inductor L101 is connected to the first input end of the DC conversion module. The second output end of the inductor L101 is connected to the second input end of the DC conversion module.

[0008] In some embodiments, the DC conversion module includes switching transistors Q7, Q8, Q9, Q10, Q11, Q12, capacitors C3, C4, C5, inductors L1, L2, L3, transformers T1, T2, T3; the first ends of switching transistors Q7, Q9, and Q11 are all connected to the first output end of the common-mode module, the second end of switching transistor Q7 is connected to the first end of switching transistor Q8 and the first end of capacitor C3, the second end of switching transistor Q9 is connected to the first end of switching transistor Q10 and the first end of capacitor C4, the second end of switching transistor Q11 is connected to the first end of switching transistor Q12 and the first end of capacitor C5, the second ends of switching transistors Q8, Q10, and Q12 are all connected to the second output end of the common-mode module, the control ends of switching transistors Q7, Q8, Q9, Q10, Q11, and Q12 are all connected to the control module, the second end of capacitor C3 is connected to the fifth end of transformer T1 through inductor L1, the second end of capacitor C4 is connected to the fifth end of transformer T2 through inductor L2, the second end of capacitor C5 is connected to the fifth end of transformer T3 through inductor L3, and the sixth ends of transformers T1, T2, and T3 are connected.

[0009] In some embodiments, the control module includes a primary control unit and a secondary control unit; the primary control unit is respectively connected to the AC conversion module and the secondary control unit, and the secondary control unit is further connected to the DC conversion module; the primary control unit is configured to collect the current and voltage in the AC conversion module and output a first driving signal; the secondary control unit is configured to collect the current and voltage in the DC conversion module and output a second driving signal.

[0010] In some embodiments, the common-mode interference suppression circuit further includes a first filtering module; the output end of the AC conversion module is connected to the input end of the common-mode module through the first filtering module; the first filtering module is configured to filter the high-voltage direct current output by the AC conversion module.

[0011] In some embodiments, the first filtering module includes capacitor C1; the first end of capacitor C1 is connected to the first output end of the AC conversion module and the first input end of the common-mode module, and the second end of capacitor C1 is connected to the second output end of the AC conversion module and the second input end of the common-mode module.

[0012] In some embodiments, the common-mode interference suppression circuit further includes a second filtering module; the output end of the common-mode module is connected to the DC conversion module through the second filtering module; the second filtering module is used to filter the high-voltage direct current input to the DC conversion module.

[0013] In some embodiments, the second filtering module includes a capacitor C2; the first end of the capacitor C2 is connected to both the first output end of the common-mode module and the first input end of the DC conversion module, and the second end of the capacitor C2 is connected to the second output end of the common-mode module and the second input end of the DC conversion module.

[0014] In a second aspect, an embodiment of the present application provides a common-mode interference suppression device, including the common-mode interference suppression circuit as described above.

[0015] Different from the prior art solutions, an embodiment of the present application provides a common-mode interference suppression circuit and device. Among them, the common-mode interference suppression circuit includes: an AC conversion module, a common-mode module, a DC conversion module, and a control module; the input end of the AC conversion module is connected to an AC power supply, the output end of the AC conversion module is connected to the input end of the common-mode module, the output end of the common-mode module is connected to the input end of the DC conversion module, and the control ends of the AC conversion module and the DC conversion module are respectively connected to the control module; the control module is used to collect the current and voltage in the AC conversion module and output a first driving signal, collect the current and voltage in the DC conversion module and output a second driving signal; the AC conversion module is used to rectify and boost the alternating current output by the AC power supply to obtain high-voltage direct current when receiving the first driving signal; the common-mode module is used to attenuate the common-mode interference generated when the AC conversion module works; the DC conversion module is used to convert the high-voltage direct current to obtain low-voltage direct current when receiving the second driving signal. The common-mode interference suppression circuit and device provided by the embodiment of the present application can effectively suppress common-mode interference, reduce the noise and electromagnetic interference in the power supply, improve the stability and purity of the output direct current, and provide a more reliable and high-quality power supply for the backend load. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more embodiments are exemplarily illustrated by corresponding drawings. These exemplary illustrations do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, unless otherwise stated, and the figures in the drawings do not constitute a proportional limitation.

[0017] Figure 1 is a structural block diagram of a common-mode interference suppression circuit provided by an embodiment of the present application;

[0018] Figure 2 It is a structural block diagram of a common-mode interference suppression circuit provided by another embodiment of the present application;

[0019] Figure 3 It is a schematic circuit diagram of a common-mode interference suppression circuit provided by an embodiment of the present application. Specific Embodiments

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and detailedly described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0021] The technical features involved in the various embodiments of the present application described below do not conflict with each other and can be combined with each other.

[0022] When an element is expressed as being "connected" to another element, it can be directly connected to the other element, or there can be one or more intermediate elements therebetween.

[0023] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order different from those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually of the same category, and the number of objects is not limited. For example, the first object can be one or more.

[0024] Please refer to Figure 1 , Figure 1 It is a structural block diagram of a common-mode interference suppression circuit 100 provided by an embodiment of the present application.

[0025] The embodiments of the present application provide a common-mode interference suppression circuit 100, including: an AC conversion module 10, a common-mode module 20, a DC conversion module 30, and a control module 40.

[0026] Among them, the input end of the AC conversion module 10 is connected to the AC power supply 200, the output end of the AC conversion module 10 is connected to the input end of the common-mode module 20, the output end of the common-mode module 20 is connected to the input end of the DC conversion module 30, and the control ends of the AC conversion module 10 and the DC conversion module 30 are respectively connected to the control module 40.

[0027] Specifically, the control module 40 is configured to collect the current and voltage in the AC conversion module 10 and output a first driving signal, and collect the current and voltage in the DC conversion module 30 and output a second driving signal; the AC conversion module 10 is configured to rectify and boost the alternating current output by the AC power supply 200 to obtain high-voltage direct current when receiving the first driving signal; the common-mode module 20 is configured to attenuate the common-mode interference generated when the AC conversion module 10 operates; the DC conversion module 30 is configured to convert the high-voltage direct current to obtain low-voltage direct current when receiving the second driving signal.

[0028] In this embodiment, first, the alternating current output by the AC power supply 200 is connected to the input end of the AC conversion module 10. The control module 40 collects the current and voltage in the AC conversion module 10. Then, the control module 40 outputs a first driving signal to the AC conversion module 10 according to the collected information. After receiving the first driving signal, the AC conversion module 10 performs rectification and boosting operations on the input alternating current and converts it into high-voltage direct current. During the operation of the AC conversion module 10, common-mode interference will be generated. The common-mode module 20 plays a role at this time to attenuate these common-mode interferences and reduce their influence. Next, the high-voltage direct current is transmitted to the DC conversion module 30. The control module 40 collects the current and voltage in the DC conversion module 30 and outputs a second driving signal. Finally, after receiving the second driving signal, the DC conversion module 30 converts the high-voltage direct current to obtain the required low-voltage direct current. Throughout the process, the control module 40 precisely controls the operation of these two modules by collecting the current and voltage information of the AC conversion module 10 and the DC conversion module 30 in real time and outputting driving signals accordingly. At the same time, the common-mode module 20 effectively suppresses the common-mode interference, ensuring the stable and reliable operation of the circuit.

[0029] The common-mode interference suppression circuit 100 provided by the embodiment of the present application can effectively suppress common-mode interference, reduce the noise and electromagnetic interference in the power supply, improve the stability and purity of the output direct current, and provide a more reliable and high-quality power supply for the backend load. Reduce the influence of common-mode interference on sensitive components in the circuit, reduce the risk of circuit failures and misoperations caused by interference, and improve the stability and reliability of the entire system. Provide better working conditions for equipment (such as precision instruments, communication equipment, etc.) that rely on high-quality power supplies, and help improve the performance and accuracy of the equipment.

[0030] Please refer to Figure 2 , Figure 2 which is the structural block diagram of the common-mode interference suppression circuit 100 provided by another embodiment of the present application.

[0031] In some embodiments, the control module 40 includes a primary control unit 41 and a secondary control unit 42.

[0032] Among them, the primary side control unit 41 is respectively connected to the AC conversion module 10 and the secondary side control unit 42, and the secondary side control unit 42 is also connected to the DC conversion module 30.

[0033] Specifically, the primary side control unit 41 is used to collect the current and voltage in the AC conversion module 10 and output a first drive signal. The secondary side control unit 42 is used to collect the current and voltage in the DC conversion module 30 and output a second drive signal.

[0034] In this embodiment, the primary side control unit 41 is at the front end of the circuit and is directly connected to the AC conversion module 10. The primary side control unit 41 is used to accurately collect the current and voltage signals in the AC conversion module 10. The primary side control unit 41 includes a sampling circuit and a control circuit, such as DSP (Digital Signal Processing), etc., to ensure that the acquired signals accurately reflect the working state of the AC conversion module. And perform real-time analysis and processing on the collected current and voltage data. Through complex algorithms and calculations, judge whether the working condition of the AC conversion module meets the expectations, and identify possible abnormalities or deviations. Then, based on the results of the analysis and processing, generate a first drive signal. The characteristics (such as pulse width, frequency, etc.) of the first drive signal determine the on and off times of the switching devices in the AC conversion module 10, thereby controlling the output characteristics of the AC conversion module 10, such as voltage amplitude, current magnitude, etc. The primary side control unit 41 communicates with the secondary side control unit 42, shares key information, and cooperates to complete the optimization control of the entire circuit. The primary side control unit 41 continuously monitors the working parameters of the AC conversion module 10. Once an abnormality is found, such as excessive current, too high or too low voltage, etc., quickly take protective measures, such as adjusting the drive signal or triggering the protection circuit, to prevent circuit damage.

[0035] The secondary side control unit 42 is located at the rear end of the circuit and is connected to the DC conversion module 30. The secondary side control unit 42 accurately acquires the current and voltage data in the DC conversion module 30. The secondary side control unit 42 has a sampling circuit and a control circuit (such as a DSP) to obtain accurate and real-time information. According to the acquired current and voltage information, the secondary side control unit 42 outputs a second drive signal through calculation and analysis to adjust the working state of the DC conversion module 30, achieving precise control of the output DC voltage and current and meeting the requirements of the load. The secondary side control unit 42 can quickly respond to load changes or fluctuations in the input power supply, timely adjust the working parameters of the DC conversion module 30, and ensure the stability and reliability of the output. The secondary side control unit 42 closely monitors the working parameters of the DC conversion module. When abnormal conditions such as overcurrent, overvoltage, and overheating occur, it quickly activates the protection mechanism to ensure the safety of the entire circuit and the load. The secondary side control unit 42 maintains good communication and coordination with the primary side control unit 41 to jointly achieve the efficient and stable operation of the entire circuit. For example, it optimizes the control strategy of the secondary side according to the working state of the primary side.

[0036] Generally speaking, the primary side control unit 41 focuses on the control and optimization of the AC conversion part, while the secondary side control unit 42 focuses on the precise control and protection of the DC conversion part. The two work together to ensure the performance and reliability of the entire common-mode interference suppression circuit.

[0037] In some embodiments, the common-mode interference suppression circuit 100 further includes a first filtering module 50. Among them, the output end of the AC conversion module 10 is connected to the input end of the common-mode module 20 through the first filtering module 50.

[0038] Specifically, the first filtering module 50 is used to filter the high-voltage direct current output by the AC conversion module 10.

[0039] In some embodiments, the common-mode interference suppression circuit 100 further includes a second filtering module 60. Among them, the output end of the common-mode module 20 is connected to the DC conversion module 30 through the second filtering module 60.

[0040] Specifically, the second filtering module 60 is used to filter the high-voltage direct current input to the DC conversion module 30.

[0041] Please refer to Figure 3 , Figure 3 which is a schematic diagram of the circuit structure of the common-mode interference suppression circuit 100 provided by an embodiment of the present application.

[0042] In some embodiments, the AC conversion module 10 includes an inductor LA, an inductor LB, an inductor LC, a switching transistor Q1, a switching transistor Q2, a switching transistor Q3, a switching transistor Q4, a switching transistor Q5, and a switching transistor Q6. As Figure 3As shown, the AC power supply 200 includes three-phase alternating current, namely, phase-A alternating current, phase-B alternating current, and phase-C alternating current.

[0043] Among them, the first ends of inductor LA, inductor LB, and inductor LC are all connected to the AC power supply 200. The second end of inductor LA is connected to the second end of switching transistor Q1 and the first end of switching transistor Q2. The second end of inductor LB is connected to the second end of switching transistor Q3 and the first end of switching transistor Q4. The second end of inductor LC is connected to the second end of switching transistor Q5 and the first end of switching transistor Q6. The first ends of switching transistor Q1, switching transistor Q3, and switching transistor Q5 are all connected to the first input terminal of the common-mode module 20. The second ends of switching transistor Q2, switching transistor Q4, and switching transistor Q6 are all connected to the second input terminal of the common-mode module 20. The control terminals of switching transistor Q1, switching transistor Q2, switching transistor Q3, switching transistor Q4, switching transistor Q5, and switching transistor Q6 are all connected to the control module 40.

[0044] Among them, in this embodiment, switching transistors Q1, Q2, Q3, Q4, Q5, and Q6 are taken as N-MOS transistors (Metal-Oxide-Semiconductor Field-Effect Transistor). Taking switching transistor Q1 as an example, the gate of the N-MOS transistor is the control terminal of switching transistor Q1, the drain of the N-MOS transistor is the first end of switching transistor Q1, and the source of the N-MOS transistor is the second end of switching transistor Q1. Other switching transistors are similar to switching transistor Q1 and will not be elaborated here.

[0045] In addition, switching transistors Q1, Q2, Q3, Q4, Q5, and Q6 can be any controllable switches. For example, Insulated Gate Bipolar Transistor (IGBT) devices, Integrated Gate Commutated Thyristor (IGCT) devices, Gate Turn-Off Thyristor (GTO) devices, Silicon Controlled Rectifier (SCR) devices, Junction Gate Field-Effect Transistor (JFET) devices, MOS Controlled Thyristor (MCT) devices, etc.

[0046] The AC conversion module 10 is a three-phase six-switch two-level PFC. The AC conversion module 10 includes six switching transistors and three inductors. The inductors are connected to the midpoints of each bridge arm. Between switching transistors Q1-Q6, by a certain logic wave generation method, the duty cycles of switching transistors Q1-Q6 are adjusted to achieve voltage boost, and the mains power is rectified into high-voltage direct current.

[0047] In some embodiments, the common-mode module 20 includes an inductor L101. The first input terminal of the inductor L101 is connected to the first output terminal of the AC conversion module 10, the second input terminal of the inductor L101 is connected to the second output terminal of the AC conversion module 10, the first output terminal of the inductor L101 is connected to the first input terminal of the DC conversion module 30, and the second output terminal of the inductor L101 is connected to the second input terminal of the DC conversion module 30.

[0048] The voltages of the inductors LA, LB, and LC are transformed to 1 / 6Vpfc, and the voltage change between every two levels of the switching transistors Q1, Q2, Q3, Q4, Q5, and Q6 is 1 / 3Vpfc. Therefore, this topology itself causes greater common-mode interference. At this time, the common-mode inductor L101 connected in series on the bus can effectively suppress the interference generated by larger voltage mutations.

[0049] In some embodiments, the DC conversion module 30 includes switching transistors Q7, Q8, Q9, Q10, Q11, Q12, capacitors C3, C4, C5, inductors L1, L2, L3, transformers T1, T2, and T3.

[0050] The first terminals of the switching transistors Q7, Q9, and Q11 are all connected to the first output terminal of the common-mode module 20. The second terminal of the switching transistor Q7 is connected to the first terminal of the switching transistor Q8 and the first terminal of the capacitor C3. The second terminal of the switching transistor Q9 is connected to the first terminal of the switching transistor Q10 and the first terminal of the capacitor C4. The second terminal of the switching transistor Q11 is connected to the first terminal of the switching transistor Q12 and the first terminal of the capacitor C5. The second terminals of the switching transistors Q8, Q10, and Q12 are all connected to the second output terminal of the common-mode module 20. The control terminals of the switching transistors Q7, Q8, Q9, Q10, Q11, and Q12 are all connected to the control module 40. The second terminal of the capacitor C3 is connected to the fifth terminal of the transformer T1 through the inductor L1. The second terminal of the capacitor C4 is connected to the fifth terminal of the transformer T2 through the inductor L2. The second terminal of the capacitor C5 is connected to the fifth terminal of the transformer T through the inductor L3. The sixth terminals of the transformers T1, T2, and T3 are connected.

[0051] Among them, in this embodiment, taking switching transistors Q7, Q8, Q9, Q10, Q11, and Q12 as N-MOS transistors (Metal-Oxide-Semiconductor Field-Effect Transistor) as an example. Taking switching transistor Q7 as an example, the gate of the N-MOS transistor is the control end of switching transistor Q7, the drain of the N-MOS transistor is the first end of switching transistor Q7, and the source of the N-MOS transistor is the second end of switching transistor Q7. Other switching transistors are similar to switching transistor Q7 and will not be elaborated here.

[0052] In addition, switching transistors Q7, Q8, Q9, Q10, Q11, and Q12 can be any controllable switches, such as Insulated Gate Bipolar Transistor (IGBT) devices, Integrated Gate Commutated Thyristor (IGCT) devices, Gate Turn-Off Thyristor (GTO) devices, Silicon Controlled Rectifier (SCR) devices, Junction Gate Field Effect Transistor (JFET) devices, MOS Controlled Thyristor (MCT) devices, etc.

[0053] The DC conversion module �0 adopts a three-phase interleaved LLC (Inductor-Inductor-Capacitor, resonant circuit). Resonant capacitors C3-C5 and resonant inductors L1-L3 are connected in series between the midpoint of the bridge arm and the transformer. The three groups of transformers are connected in a Y-connection. By controlling the phase difference between switching transistors Q7, Q9, and Q11 to be 120°, and the corresponding complementary switching transistors Q8, Q10, and Q12 for 50% duty cycle chopping, by adjusting the switching frequency of the switching transistors, the three groups of L1, C3, T1 in group A; L2, C4, T2 in group B; and L3, C5, T4 in group C respectively resonate to transfer energy to the output.

[0054] In some embodiments, the first filtering module 50 includes a capacitor C1.

[0055] Among them, the first end of capacitor C1 is connected to both the first output end of the AC conversion module 10 and the first input end of the common mode module 20, and the second end of capacitor C1 is connected to the second output end of the AC conversion module 10 and the second input end of the common mode module 20.

[0056] In some embodiments, the second filtering module 60 includes a capacitor C2.

[0057] Among them, the first end of capacitor C2 is connected to both the first output end of the common mode module 20 and the first input end of the DC conversion module 30, and the second end of capacitor C2 is connected to the second output end of the common mode module 20 and the second input end of the DC conversion module 30.

[0058] The common-mode interference suppression circuit 100 provided by the embodiment of the present application can effectively suppress common-mode interference, reduce the noise and electromagnetic interference in the power supply, improve the stability and purity of the output direct current, and provide a more reliable and high-quality power supply for the backend load. It reduces the influence of common-mode interference on sensitive components in the circuit, reduces the risk of circuit failures and malfunction caused by interference, and improves the stability and reliability of the entire system. It provides better working conditions for devices that rely on high-quality power supplies (such as precision instruments, communication devices, etc.), and helps to improve the performance and accuracy of the devices.

[0059] In a second aspect, the embodiment of the present application provides a common-mode interference suppression device, including the common-mode interference suppression circuit 100 as described above. The AC power supply is connected to the load 200 through the common-mode interference suppression circuit 100.

[0060] The common-mode interference suppression circuit 100 includes: an AC conversion module 10, a common-mode module 20, a DC conversion module 30, and a control module 40. Among them, the input end of the AC conversion module 10 is connected to the AC power supply 200, the output end of the AC conversion module 10 is connected to the input end of the common-mode module 20, the output end of the common-mode module 20 is connected to the input end of the DC conversion module 30, and the control ends of the AC conversion module 10 and the DC conversion module 30 are respectively connected to the control module 40. Specifically, the control module 40 is used to collect the current and voltage in the AC conversion module 10 and output a first driving signal, and collect the current and voltage in the DC conversion module 30 and output a second driving signal; the AC conversion module 10 is used to rectify and boost the alternating current output by the AC power supply 200 when receiving the first driving signal to obtain high-voltage direct current; the common-mode module 20 is used to attenuate the common-mode interference generated when the AC conversion module 10 works; the DC conversion module 30 is used to convert the high-voltage direct current when receiving the second driving signal to obtain low-voltage direct current.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; under the idea of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes in different aspects of the present invention as described above. For the sake of brevity, they are not provided in detail; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A common-mode interference suppression circuit, characterized in that: Includes: AC conversion module, common mode module, DC conversion module, control module; The input end of the AC conversion module is connected to the AC power supply, the output end of the AC conversion module is connected to the input end of the common mode module, the output end of the common mode module is connected to the input end of the DC conversion module, and the control end of the AC conversion module and the control end of the DC conversion module are respectively connected to the control module; The control module is used to collect the current and voltage in the AC conversion module and output a first drive signal, and collect the current and voltage in the DC conversion module and output a second drive signal; The AC conversion module is configured to rectify and boost the AC power output by the AC power supply to obtain high-voltage DC power when receiving the first drive signal; The common mode module is used to attenuate the common mode interference generated when the AC conversion module is working; The DC conversion module is configured to convert the high-voltage DC power to obtain low-voltage DC power when receiving the second driving signal.

2. The common-mode interference suppression circuit according to claim 1, characterized in that: The AC conversion module includes an inductor LA, an inductor LB, an inductor LC, a switch tube Q1, a switch tube Q2, a switch tube Q3, a switch tube Q4, a switch tube Q5, and a switch tube Q6; The first end of the inductor LA, the first end of the inductor LB, and the first end of the inductor LC are all connected to the AC power supply. The second end of the inductor LA is connected to the second end of the switch Q1 and the first end of the switch Q2. The second end of the inductor LB is connected to the second end of the switch Q3 and the first end of the switch Q4. The second end of the inductor LC is connected to the second end of the switch Q5 and the first end of the switch Q6. The first end of the switch Q1, the first end of the switch Q3, and the first end of the switch Q5 are all connected to the first input end of the common-mode module. The second end of the switch Q2, the second end of the switch Q4, and the second end of the switch Q6 are all connected to the second input end of the common-mode module. The control ends of the switches Q1, Q2, Q3, Q4, Q5, and Q6 are all connected to the control module.

3. The common-mode interference suppression circuit according to claim 1, characterized in that: The common mode module includes an inductor L101; The first input end of the inductor L101 is connected to the first output end of the AC conversion module, the second input end of the inductor L101 is connected to the second output end of the AC conversion module, the first output end of the inductor L101 is connected to the first input end of the DC conversion module, and the second output end of the inductor L101 is connected to the second input end of the DC conversion module.

4. The common-mode interference suppression circuit according to claim 1, characterized in that: The DC conversion module includes switch tubes Q7, Q8, Q9, Q10, Q11, Q12, capacitors C3, C4, C5, inductor L1, L2, L3, transformers T1, T2, and T3. The first end of the switch tube Q7, the first end of the switch tube Q9, and the first end of the switch tube Q11 are all connected to the first output end of the common-mode module. The second end of the switch tube Q7 is connected to the first end of the switch tube Q8 and the first end of the capacitor C3. The second end of the switch tube Q9 is connected to the first end of the switch tube Q10 and the first end of the capacitor C4. The second end of the switch tube Q11 is connected to the first end of the switch tube Q12 and the first end of the capacitor C5. The second ends of the switch tubes Q8, Q10, and Q12 are all connected to the second output end of the common-mode module. The control end of the gate transistor Q7, the control end of the switch transistor Q8, the control end of the switch transistor Q9, the control end of the switch transistor Q10, the control end of the switch transistor Q11, and the control end of the switch transistor Q12 are all connected to the control module. The second end of the capacitor C3 is connected to the fifth end of the transformer T1 through the inductor L1. The second end of the capacitor C4 is connected to the fifth end of the transformer T2 through the inductor L2. The second end of the capacitor C5 is connected to the fifth end of the transformer T3 through the inductor L3. The sixth end of the transformer T1, the sixth end of the transformer T2, and the sixth end of the transformer T3 are connected.

5. The common mode interference suppression circuit according to claim 1, characterized in that: The control module includes a primary side control unit and a secondary side control unit; The primary side control unit is connected to the AC conversion module and the secondary side control unit respectively, and the secondary side control unit is also connected to the DC conversion module; The primary side control unit is used to collect the current and voltage in the AC conversion module and output a first drive signal; The secondary side control unit is used to collect the current and voltage in the DC conversion module and output a second driving signal.

6. The common-mode interference suppression circuit according to any one of claims 1 to 5, characterized in that: The common-mode interference suppression circuit further includes a first filtering module; The output end of the AC conversion module is connected to the input end of the common mode module through the first filtering module; The first filtering module is used to filter the high-voltage direct current output by the alternating current conversion module.

7. The common mode interference suppression circuit according to claim 6, characterized in that: The first filtering module includes a capacitor C1; The first end of the capacitor C1 is connected to the first output end of the AC conversion module and the first input end of the common mode module, and the second end of the capacitor C1 is connected to the second output end of the AC conversion module and the second input end of the common mode module.

8. The common mode interference suppression circuit according to claim 7, characterized in that: The common-mode interference suppression circuit further includes a second filtering module; The output end of the common mode module is connected to the DC conversion module through the second filtering module; The second filtering module is used to filter the high-voltage direct current input to the direct current conversion module.

9. The common mode interference suppression circuit according to claim 8, characterized in that: The second filtering module includes a capacitor C2; The first end of the capacitor C2 is connected to the first output end of the common mode module and the first input end of the DC conversion module, and the second end of the capacitor C2 is connected to the second output end of the common mode module and the second input end of the DC conversion module.

10. A common mode interference suppression device, characterized in that: The common-mode interference suppression circuit comprises the common-mode interference suppression circuit according to any one of claims 1 to 9.

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