Rectifying and filtering circuit and system

Abstract

The utility model relates to a rectification filter circuit and system, the rectification filter circuit comprises a filtering inhibition module, a common mode interference inhibition module and a rectification filter module, the filtering inhibition module receives a power supply signal input by an input power supply, carries out filtering inhibition on the power supply signal, and outputs a first inhibition signal; the common-mode interference suppression module carries out common-mode interference suppression on the first suppression signal to output a second suppression signal, and then the rectification filtering module carries out rectification filtering on the second suppression signal to output a rectification filtering signal; therefore, rectification of the switching power supply transformer or the secondary transformer can be avoided, the problem of high cost of rectification of the switching power supply transformer or the secondary transformer in the prior art is solved, the cost can be effectively reduced, and the interference suppression efficiency can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of circuit, in particular to a rectification filtering circuit and system. BACKGROUND

[0002] There are conduction interference and radiation interference caused by power devices in the flyback switching power supply, which are mainly caused by current rate of change and voltage rate of change, in addition, there are also large harmonic components in the power supply, low input power factor and other factors will bring various interference to the power supply circuit; in the prior art, the switching power supply transformer or secondary transformer is usually modified to suppress part of the interference, however, the modification of the switching power supply transformer or secondary transformer will bring the problem of high cost. CONTENT OF THE UTILITY MODEL

[0003] In order to solve the problem of high cost in the modification of the switching power supply transformer or secondary transformer in the prior art, the present application provides a rectification filtering circuit and system.

[0004] In a first aspect, the present application provides a rectification filtering circuit, comprising a filtering suppression module, a common mode interference suppression module and a rectification filtering module;

[0005] The first end of the filtering suppression module is electrically connected with the input power supply, the second end of the filtering suppression module, the first end of the common mode interference suppression module and the first end of the rectification filtering module are electrically connected, and the second end of the common mode interference suppression module is electrically connected with the first end of the rectification filtering module;

[0006] The filtering suppression module is used for receiving the power supply signal input by the input power supply, filtering and suppressing the power supply signal, and outputting a first suppression signal;

[0007] The common mode interference suppression module is used for suppressing the common mode interference of the first suppression signal, and outputting a second suppression signal;

[0008] The rectification filtering module is used for rectifying and filtering the second suppression signal, and outputting a rectification filtering signal.

[0009] Optionally, it further comprises a boost output module, and the first end of the boost output module is electrically connected with the second end of the rectification filtering circuit;

[0010] The boost output module is used for boosting the rectification filtering signal, and outputting a boost signal corresponding to the rectification filtering signal.

[0011] Optionally, the boost output module comprises a second coil and a power supply control chip.

[0012] The first end of the second coil is electrically connected with the second end of the rectification filtering circuit, and the fourth end of the second coil, the fourth pin of the power supply control chip and a reference ground are electrically connected.

[0013] Optionally, the rectification filtering module comprises a first filtering unit and a boost rectification unit.

[0014] The first end of the first filtering unit is electrically connected with the second end of the common-mode interference suppression module, and the second end of the first filtering unit is electrically connected with the first end of the boost rectification unit.

[0015] The first filtering unit is configured to rectify and filter the second suppression signal and output a direct-current filtering signal.

[0016] The boost rectification unit is configured to boost and rectify the direct-current filtering signal and output the rectification filtering signal.

[0017] Optionally, the first filtering unit comprises a rectification bridge and a second inductor.

[0018] The second end of the rectification bridge, the third end of the rectification bridge, the second end of the filtering suppression module and the second end of the common-mode interference suppression module are electrically connected, the first end of the rectification bridge is electrically connected with the first end of the second inductor, and the second end of the second inductor is electrically connected with the first end of the boost rectification unit.

[0019] Optionally, the boost rectification unit comprises a first coil and a third magnetic bead.

[0020] The second end of the first filtering unit is electrically connected with the second end of the first coil, the third end of the first coil is electrically connected with the first end of the third magnetic bead, and the second end of the third magnetic bead is electrically connected with a reference ground.

[0021] Optionally, the rectification filtering circuit further comprises a power factor correction module, and the power factor correction module is electrically connected with the third end of the boost rectification unit.

[0022] Optionally, the filtering suppression module comprises a first capacitor, a second capacitor and a first inductor.

[0023] One side of the first capacitor is electrically connected with the input power supply, the other side of the first capacitor is electrically connected with one side of the first inductor, the other side of the first inductor is electrically connected with one side of the second capacitor, the other side of the second capacitor, the first end of the common-mode interference suppression module and the first end of the rectification filtering module are electrically connected.

[0024] Optionally, the common-mode interference suppression module comprises a third capacitor, a fourth capacitor, a first magnetic bead and a second magnetic bead.

[0025] The first end of the third capacitor, the second end of the filter suppression module, and the second end of the rectification filter module are electrically connected, the second end of the three capacitors, the first end of the fourth capacitor, the first end of the first magnetic bead, and the first end of the second magnetic bead are electrically connected, the second end of the fourth capacitor, the second end of the filter suppression module, and the second end of the rectification filter module are electrically connected, and the second end of the first magnetic bead, the second end of the second magnetic bead, and the reference ground are electrically connected.

[0026] In a second aspect, the present application provides a rectification filter system comprising the rectification filter circuit of any one of the first aspect.

[0027] The first end of the filter suppression module is electrically connected to the input power supply, the second end of the filter suppression module, the first end of the common-mode interference suppression module, and the first end of the rectification filter module are electrically connected, the second end of the common-mode interference suppression module is electrically connected to the first end of the rectification filter module, so that the filter suppression module can receive the power supply signal input by the input power supply, filter and suppress the power supply signal, and output a first suppression signal, so that the common-mode interference suppression module can suppress the common-mode interference of the first suppression signal and output a second suppression signal, and then the rectification filter module can rectify and filter the second suppression signal and output a rectification filter signal; thus, the switch power supply transformer or the secondary transformer can be avoided to be modified, the problem of high cost in the prior art for modifying the switch power supply transformer or the secondary transformer can be solved, and the cost can be effectively reduced and the interference suppression efficiency can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0028] The accompanying drawings, which are incorporated into and form a part of the specification, illustrate an embodiment consistent with the present application and, together with the description, serve to explain the principles of the application.

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, those skilled in the art can obtain other drawings according to these drawings without any creative effort.

[0030] Figure 1 A structural schematic diagram of a rectification filter circuit provided by the present application embodiment;

[0031] Figure 2 Another structural schematic diagram of a rectification filter circuit provided by the present application embodiment;

[0032] Figure 3 Still another structural schematic diagram of a rectification filter circuit provided by the present application embodiment;

[0033] Figure 4 This is a schematic diagram of the circuit principle of a rectifier filter circuit provided in an embodiment of this application.

[0034] Attached image labels:

[0035] 11. Filtering suppression module; 12. Common-mode interference suppression module; 13. Rectifier and filter module; 131. First-stage filter unit; 132. Boost rectifier unit; 14. Boost output module; 15. Power factor correction module. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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, 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.

[0037] Figure 1 This is a schematic diagram of a rectifier filter circuit provided in an embodiment of this application.

[0038] like Figure 1 As shown in the illustration, this application discloses an embodiment of a rectifier-filter circuit, including a filter suppression module 11, a common-mode interference suppression module 12, and a rectifier-filter module 13. The first terminal of the filter suppression module 11 is electrically connected to the input power supply. The second terminal of the filter suppression module 11, the first terminal of the common-mode interference suppression module 12, and the first terminal of the rectifier-filter module 13 are electrically connected. The second terminal of the common-mode interference suppression module 12 is electrically connected to the first terminal of the rectifier-filter module 13. The filter suppression module 11 is used to receive the power signal input from the input power supply, filter and suppress the power signal, and output a first suppression signal. The common-mode interference suppression module 12 is used to suppress common-mode interference in the first suppression signal and output a second suppression signal. The rectifier-filter module 13 is used to rectify and filter the second suppression signal and output a rectified and filtered signal.

[0039] In this embodiment, the input power supply can be AC ​​mains power. After receiving the power signal from the input power supply, the filtering and suppression module 11 can filter and suppress the power signal and output a first suppression signal to the common-mode interference suppression module 12. The filtering and suppression can suppress noise and spurious signals in the input signal. Then, the common-mode interference suppression module 12 can suppress common-mode interference in the first suppression signal and output a second suppression signal to the common-mode interference suppression module 12. The common-mode interference suppression can be a process of suppressing common-mode interference and suppressing high-frequency interference in the input circuit in the first suppression signal. Subsequently, the common-mode interference suppression module 12 can rectify and filter the second suppression signal and output a rectified and filtered signal.

[0040] Specifically, this embodiment uses the filtering and suppression module 11 to suppress noise and spurious signals in the input signal, and then uses the common-mode interference suppression module 12 to suppress common-mode interference and high-frequency interference in the input circuit. This can solve the problem of poor consistency in electromagnetic interference (EMI) testing while avoiding the need to modify the switching power supply transformer or secondary transformer, thereby effectively reducing costs and improving the efficiency of interference suppression.

[0041] like Figure 3 As shown, in an optional embodiment of this application, a boost output module 14 is further included. The first terminal of the boost output module 14 is electrically connected to the second terminal of the rectifier-filter circuit. The boost output module 14 is used to boost the rectifier-filter signal and output the boost signal corresponding to the rectifier-filter signal.

[0042] In this embodiment, the rectified and filtered signal is boosted by the boost output module 14 to output the boosted signal corresponding to the rectified and filtered signal. The specific boosting method can be adaptively configured according to the requirements so that the boosted signal can reach the required voltage value. The output of the boost output module 14 can also be controlled by the power control chip U2 so that the output boosted signal can meet the required voltage value. Of course, other boosting control methods can also be used, but this embodiment does not specifically limit them.

[0043] In an optional embodiment of this application, the boost output module includes a second coil T1 and a power control chip U2; the first end of the second coil T1 is electrically connected to the second end of the rectifier filter circuit, and the fourth end of the second coil T1, the fourth pin of the power control chip U2, and the reference ground are electrically connected.

[0044] like Figure 4As shown, the boost output module 14 in this embodiment may also include a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a third diode CS2, a fourth diode DS3, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, and a first transistor Q1.

[0045] Specifically, the first terminal of the seventh resistor R7, the first terminal of the ninth resistor R9, the first terminal of the second coil T1, and the second terminal of the rectifier filter circuit are electrically connected; the second terminal of the seventh capacitor C7, the second terminal of the ninth resistor R9, and the second terminal of the third diode CS2 are electrically connected; the first terminal of the third diode CS2, the second terminal of the second coil T1, and the drain of the first transistor Q1 are electrically connected; the gate of the first transistor Q1, the first terminal of the eleventh resistor R11, and the first terminal of the twelfth resistor R12 are electrically connected; the source of the first transistor Q1, the second terminal of the eleventh diode, the first terminal of the thirteenth resistor R13, and the first terminal of the fourteenth resistor R14 are electrically connected; and the first terminal of the thirteenth resistor R13... The first terminal of the eighth capacitor C8 and the reference ground are electrically connected. The second terminal of the twelfth resistor R12 is electrically connected to the fifth pin of the power control chip U2. The second terminal of the fourteenth resistor R14, the second terminal of the eighth capacitor C8 and the third pin of the power control chip U2 are electrically connected. The first terminal of the tenth resistor R10 is electrically connected to the third terminal of the second coil T1. The second terminal of the tenth resistor R10 is electrically connected to the first terminal of the fourth diode DS3. The second terminal of the fourth diode DS3, the first terminal of the ninth capacitor C9 and the sixth pin of the power control chip U2 are electrically connected. The second terminal of the ninth capacitor C9, the fourth terminal of the second coil T1, the fourth pin of the power control chip U2 and the reference ground are electrically connected.

[0046] In this embodiment, the second coil T1 and the power control chip U2 control the rectified and filtered signal to boost the voltage and output the boosted signal corresponding to the rectified and filtered signal.

[0047] like Figure 2 As shown in an optional embodiment of this application, the rectifier-filter module 13 includes a primary filter unit 131 and a boost rectifier unit 132; the first terminal of the primary filter unit 131 is electrically connected to the second terminal of the common-mode interference suppression module 12, and the second terminal of the primary filter unit 131 is electrically connected to the first terminal of the boost rectifier unit 132; the primary filter unit 131 is used to rectify and filter the second suppression signal to output a DC filtered signal; the boost rectifier unit 132 is used to boost and rectify the DC filtered signal to output a rectified and filtered signal.

[0048] In this embodiment, after receiving the second suppression signal, the rectifier and filter module 13 rectifies and filters the second suppression signal through the first-stage filter unit 131, and outputs a DC filtered signal to the boost rectifier unit 132. The rectification and filtering may specifically include rectifying the second suppression signal into DC power and performing a first-stage filter to reduce the DC power ripple. Then, the boost rectifier unit 132 boosts and rectifies the DC filtered signal to output a rectified and filtered signal. The boost rectification may include correcting the phase difference of the current waveform, reducing harmonic components, and improving the power factor.

[0049] In an optional embodiment of this application, the first-stage filtering unit 131 includes a rectifier bridge DB1 and a second inductor L1; the second end of the rectifier bridge DB1, the third end of the rectifier bridge DB1, the second end of the filter suppression module and the second end of the common-mode interference suppression module are electrically connected, the first end of the rectifier bridge DB1 is electrically connected to the first end of the second inductor L1, and the second end of the second inductor L1 is electrically connected to the first end of the boost rectifier unit.

[0050] like Figure 4 As shown, the primary filter unit 131 may further include a fifth capacitor C5 and a sixth capacitor C6; the second terminal of the rectifier bridge DB1, the third terminal of the rectifier bridge DB1, the second terminal of the filter suppression module 11, and the second terminal of the common-mode interference suppression module 12 are electrically connected; the first terminal of the rectifier bridge DB1, the first terminal of the fifth capacitor C5, and the first terminal of the second inductor L1 are electrically connected; the second terminal of the second inductor L1, the first terminal of the sixth capacitor C6, and the first terminal of the boost rectifier unit 132 are electrically connected; and the second terminal of the sixth capacitor C6, the fourth terminal of the rectifier, the second terminal of the fifth capacitor C5, and the reference ground are electrically connected.

[0051] In this embodiment, after receiving the second suppression signal of AC power, the first-stage filter unit 131 can rectify the second suppression signal of AC power into DC power through the rectifier bridge DB1, and then perform first-stage filtering through the circuit connected by the fifth capacitor C5, the sixth capacitor C6 and the second inductor L1, so as to reduce the DC power ripple.

[0052] In an optional embodiment of this application, the boost rectifier unit 132 includes a first coil TR1 and a third ferrite bead L2; the second end of the first-stage filter unit 131 is electrically connected to the second end of the first coil TR1, the third end of the first coil TR1 is electrically connected to the first end of the third ferrite bead L2, and the second end of the third ferrite bead L2 is electrically connected to a reference ground.

[0053] like Figure 4As shown, the boost rectifier unit 132 may further include a first diode D1, a second diode DS1, a seventh resistor R7, an eighth resistor R8, and a polarized capacitor CE1; the first terminal of the first diode D1, the second terminal of the first-stage filter unit 131, and the second terminal of the first coil TR1 are electrically connected; the second terminal of the first diode D1, the first terminal of the second diode DS1, the first terminal of the third ferrite bead L2, the second terminal of the second diode DS1, and the first terminal of the seventh resistor R7 are electrically connected; the second terminal of the second diode DS1 is electrically connected to the third terminal of the first coil TR1; the second terminal of the seventh resistor R7 serves as a feedback control node; the second terminal of the third ferrite bead L2, the positive terminal of the polarized capacitor CE1, and the first terminal of the eighth resistor R8 are electrically connected; the negative terminal of the polarized capacitor CE1, the second terminal of the eighth resistor R8, and the reference ground are electrically connected.

[0054] In this embodiment, the boost rectifier unit 132, through the electrical connection circuit of the first diode D1, the second diode DS1, the first coil TR1, the seventh resistor R7, the eighth resistor R8, the polarized capacitor CE1, and the third ferrite bead L2, can boost and rectify the DC filter signal output by the first-stage filter unit 131, and output a rectified filter signal. Specifically, it corrects the phase difference of the current waveform, reduces harmonic components, and improves the power factor. The third ferrite bead L2, connected in series in the main circuit, can suppress high-frequency interference in the rectifier output circuit, thereby solving the problem of poor consistency in EMI testing.

[0055] Specifically, the third ferrite bead L2 can be a wired ferrite bead with a specification of 100~140Ω@100MHz. Compared with surface-mount multilayer ferrite beads, this type of ferrite bead has a smaller RDC and stronger shock resistance when used in the main circuit of the flyback power supply. When high frequencies occur in the circuit, the impedance of the ferrite bead increases, which can suppress high-frequency interference in the rectifier output circuit.

[0056] like Figure 3 and 4As shown, in an optional embodiment of this application, the rectifier filter circuit further includes a power factor correction module 15, which is electrically connected to the third terminal of the boost rectifier unit 132. The power factor correction module 15 includes a second transistor Q2, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a tenth capacitor C10, and a power factor correction control chip U1. The drain of the second transistor Q2 is electrically connected to the first terminal of the second diode DS1, and the source of the second transistor Q2 is electrically connected to the first terminal of the fifteenth resistor R15, the first terminal of the sixteenth resistor R16, and the first terminal of the nineteenth resistor R19. The second terminal of the sixteenth resistor R16 is connected to the reference diode DS1. The gate of the second transistor Q2, the second terminal of the fifteenth resistor R15, and the first terminal of the seventeenth resistor are connected. The second terminal of the seventeenth resistor R17 is electrically connected to the seventh pin of the power factor correction control chip U1. The first terminal of the eighteenth resistor R18 is electrically connected to the first terminal of the first coil TR1. The second terminal of the eighteenth resistor R18 is electrically connected to the fifth pin of the power factor correction control chip U1. The second terminal of the nineteenth resistor R19, the first terminal of the tenth capacitor C10, and the fourth pin of the power factor correction control chip U1 are electrically connected. The second terminal of the tenth capacitor C10 is electrically connected to the reference ground. The first pin of the power factor correction control chip U1 serves as a feedback control node and is electrically connected to the second terminal of the seventh resistor R7.

[0057] In this embodiment, the power factor correction control chip U1 and its peripheral components are used to perform power factor correction on the rectifier filter circuit.

[0058] In an optional embodiment of this application, there is a first resistor RT1, a second capacitor C2, and a first inductor LM1; one side of the first resistor RT1 is electrically connected to the input power supply, the other side of the first resistor RT1 is electrically connected to one side of the first inductor LM1, the other side of the first inductor LM1 is electrically connected to one side of the second capacitor C2, and the other side of the second capacitor C2 is electrically connected to the first terminal of the common-mode interference suppression module 12 and the first terminal of the rectifier filter module 13.

[0059] like Figure 4 As shown, the filter suppression module 11 may also include a first resistor RT1, a second resistor RZ1, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a fuse F1;

[0060] The first terminal of the first resistor RT1 is electrically connected to the second terminal of the input power supply. The second terminal of the first resistor RT1, the first terminal of the second resistor RZ1, the first terminal of the first capacitor C1, the first terminal of the third resistor R3, the first terminal of the fifth resistor R5, and the first terminal of the first inductor LM1 are electrically connected. The second terminal of the second resistor RZ1 and the first terminal of the fuse F1 are electrically connected to the first terminal of the input power supply. The second terminal of the fuse F1 is electrically connected to the second terminal of the first capacitor C1, the second terminal of the fourth resistor R4, the second terminal of the sixth resistor R6, and the fourth terminal of the first inductor LM1. The second terminal of the third resistor R3, the first terminal of the fourth resistor R4, the second terminal of the fifth resistor R5, and the first terminal of the sixth resistor R6 are electrically connected. The second terminal of the first inductor LM1 is electrically connected to the first terminal of the second capacitor C2. The third terminal of the first inductor LM1 is electrically connected to the second terminal of the second capacitor C2. The first terminals of the second capacitor C2 and the second terminal of the second capacitor C2 are also electrically connected to the first terminal of the common-mode interference suppression module 12.

[0061] In this embodiment, the first capacitor C1 and the second capacitor C2 can be X-type capacitors. X-type capacitors are mainly used to suppress differential mode interference. They are usually connected between the live wire and the neutral wire of the power supply and can suppress interference between power lines. In this embodiment, the electrical connection relationship between the first capacitor C1, the second capacitor C2 and the first inductor LM1 forms a double π-type filter circuit, which suppresses noise and spurious signals of the input signal.

[0062] In addition, in this embodiment, the first resistor RT1 can be a thermistor and the second resistor RZ1 can be a varistor. Through the electrical connection of the fuse F1, the thermistor, and the varistor, a surge protection circuit is formed. When there is high voltage such as lightning strike, when the voltage across the varistor exceeds its operating voltage, its resistance decreases, so that the high voltage energy is consumed by the varistor. If the current is too large, the thermistor will increase its resistance to limit the input current and prevent the surge current from affecting the circuit. When the current exceeds the rated value, the fuse F1 will burn out to protect the downstream circuit.

[0063] like Figure 4 As shown, in an optional embodiment of this application, the common-mode interference suppression module 12 includes a third capacitor C3, a fourth capacitor C4, a first ferrite bead L3, and a second ferrite bead L4; the first end of the third capacitor C3, the second end of the filter suppression module 11, and the second end of the rectifier filter module are electrically connected; the second end of the three capacitors, the first end of the fourth capacitor C4, the first end of the first ferrite bead L3, and the first end of the second ferrite bead L4 are electrically connected; the second end of the fourth capacitor C4, the second end of the filter suppression module 11, and the second end of the rectifier filter module are electrically connected; and the second end of the first ferrite bead L3, the second end of the second ferrite bead L4, and the reference ground are electrically connected.

[0064] In this embodiment, the third capacitor C3 and the fourth capacitor C4 can be Y-type capacitors. Y-type capacitors are mainly used to suppress common-mode interference. They are connected in pairs between the live or neutral wire and the ground wire of the power supply to suppress common-mode interference. That is, the circuit formed by the electrical connection of the third capacitor C3 and the fourth capacitor C4 can suppress common-mode interference. Next, the first ferrite bead L3 and the second ferrite bead L4 can be 200~240Ω@100MHz surface-mount multilayer ferrite beads connected in series in the ground loop. When high frequencies occur in the loop, the impedance of the ferrite beads increases, which can suppress high-frequency interference in the circuit. In this embodiment, the configuration of two ferrite beads, the first ferrite bead L3 and the second ferrite bead L4, can prevent the other from still working normally when one is damaged. That is, the circuit formed by the electrical connection of the first ferrite bead L3 and the second ferrite bead L4 can suppress high-frequency interference in the input circuit.

[0065] This application also provides a rectification and filtering system, including the rectification and filtering circuit described in any of the foregoing embodiments.

[0066] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0067] The foregoing has described specific embodiments of the embodiments described in this specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than that shown in the embodiments and may still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require the specific or sequential order shown to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0068] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A rectifier-filter circuit, characterized in that, It includes a filter suppression module, a common-mode interference suppression module, and a rectifier filter module; The first end of the filtering and suppression module is electrically connected to the input power supply. The second end of the filtering and suppression module, the first end of the common-mode interference suppression module, and the first end of the rectifier and filter module are electrically connected. The second end of the common-mode interference suppression module is electrically connected to the first end of the rectifier and filter module. The filtering and suppression module is used to receive the power signal input by the input power supply, filter and suppress the power signal, and output a first suppression signal. The common-mode interference suppression module is used to suppress common-mode interference on the first suppression signal and output a second suppression signal; The rectification and filtering module is used to rectify and filter the second suppression signal and output a rectified and filtered signal.

2. The rectifier and filter circuit according to claim 1, characterized in that, It also includes a boost output module, the first terminal of which is electrically connected to the second terminal of the rectifier filter circuit; The boost output module is used to boost the rectified and filtered signal and output the boosted signal corresponding to the rectified and filtered signal.

3. The rectifier and filter circuit according to claim 2, characterized in that, The boost output module includes a second coil and a power control chip; The first end of the second coil is electrically connected to the second end of the rectifier and filter circuit, and the fourth end of the second coil, the fourth pin of the power control chip, and the reference ground are electrically connected.

4. The rectifier and filter circuit according to claim 1, characterized in that, The rectifier and filter module includes a primary filter unit and a boost rectifier unit; The first terminal of the first-stage filter unit is electrically connected to the second terminal of the common-mode interference suppression module, and the second terminal of the first-stage filter unit is electrically connected to the first terminal of the boost rectifier unit. The first-stage filtering unit is used to rectify and filter the second suppression signal to output a DC filtered signal; The boost rectifier unit is used to boost and rectify the DC filtered signal and output the rectified filtered signal.

5. The rectifier and filter circuit according to claim 4, characterized in that, The primary filter unit includes a rectifier bridge and a second inductor; The second end of the rectifier bridge, the third end of the rectifier bridge, the second end of the filter suppression module, and the second end of the common-mode interference suppression module are electrically connected. The first end of the rectifier bridge is electrically connected to the first end of the second inductor, and the second end of the second inductor is electrically connected to the first end of the boost rectifier unit.

6. The rectifier and filter circuit according to claim 4, characterized in that, The boost rectifier unit includes a first coil and a third magnetic bead; The second end of the first-stage filter unit is electrically connected to the second end of the first coil, the third end of the first coil is electrically connected to the first end of the third magnetic bead, and the second end of the third magnetic bead is electrically connected to the reference ground.

7. The rectifier and filter circuit according to claim 6, characterized in that, The rectifier and filter circuit also includes a power factor correction module, which is electrically connected to the third terminal of the boost rectifier unit.

8. The rectifier and filter circuit according to claim 1, characterized in that, The filtering and suppression module includes a first capacitor, a second capacitor, and a first inductor; One side of the first capacitor is electrically connected to the input power supply, the other side of the first capacitor is electrically connected to one side of the first inductor, the other side of the first inductor is electrically connected to one side of the second capacitor, and the other side of the second capacitor, the first terminal of the common-mode interference suppression module, and the first terminal of the rectifier filter module are electrically connected.

9. The rectifier and filter circuit according to claim 1, characterized in that, The common-mode interference suppression module includes a third capacitor, a fourth capacitor, a first ferrite bead, and a second ferrite bead. The first terminal of the third capacitor, the second terminal of the filter suppression module, and the second terminal of the rectifier filter module are electrically connected. The second terminal of the three capacitors, the first terminal of the fourth capacitor, the first terminal of the first ferrite bead, and the first terminal of the second ferrite bead are electrically connected. The second terminal of the fourth capacitor, the second terminal of the filter suppression module, and the second terminal of the rectifier filter module are electrically connected. The second terminal of the first ferrite bead, the second terminal of the second ferrite bead, and the reference ground are electrically connected.

10. A rectifier-filter system, characterized in that, Includes the rectifier filter circuit according to any one of claims 1-9.

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