Input rectification filter circuit structure applied to audio power supply module

Abstract

The utility model relates to the field of audio power supplies, in particular to an input rectification filter circuit structure applied to an audio power supply module, which is characterized by comprising an input EMI (Electro-Magnetic Interference) filter circuit, a bridge rectifier circuit and an input DC (Direct Current) filter circuit which are sequentially connected in series. The audio power supply module not only has very good rectification and filtering performance, but also has very good anti-interference performance, so that more stable electric energy can be output, and the use performance of the audio power supply module can be greatly improved.

Description

Technical Field

[0001] The utility model relates to the field of audio power supply, in particular to an input rectification and filtering circuit structure applied to an audio power supply module. Background Art

[0002] Currently, converting AC power from the mains into DC power suitable for audio equipment is often accomplished by installing a power module at the front end of the audio equipment's circuit structure. Existing power modules used in audio equipment typically consist of a transformer module, a rectifier module, a filter module, and a voltage regulator module (for example, as disclosed in Chinese Patent Publication No. CN204244100U). While these power modules can meet conventional rectification and filtering requirements, their performance is limited. Furthermore, these power modules have limited anti-interference capabilities, making unstable power output a common problem. Therefore, it is crucial to design an input rectification and filtering circuit structure for use in audio power modules to address these technical issues. Utility Model Content

[0003] The purpose of the present utility model is to solve the above-mentioned problems and shortcomings and to provide an input rectifier and filter circuit structure applied to an audio power module. The input rectifier and filter circuit structure not only has very good rectification and filtering performance, but also has very good anti-interference performance, thereby facilitating the output of more stable electric energy, which can greatly improve the performance of the audio power module.

[0004] The technical solution of the present utility model is achieved as follows:

[0005] The invention discloses an input rectification and filtering circuit structure applied to an audio power module, which is characterized in that it comprises an input EMI filtering circuit, a bridge rectification circuit, and an input DC filtering circuit which are sequentially connected in series.

[0006] Preferably, the input DC filter circuit includes a wire connected to the positive output terminal of the bridge rectifier circuit, a plurality of first ground wires connected in parallel to the wire, a second ground wire, a plurality of CBB capacitors, and a plurality of capacitor groups, each CBB capacitor is connected in series to each first ground wire, a first capacitor connected in parallel with the CBB capacitor is provided on the first ground wire, and each capacitor group is connected in series between the wire and the second ground wire.

[0007] Preferably, the capacitor group includes a plurality of second capacitors, one of which is a high-voltage ceramic capacitor, and each second capacitor is connected in series between the wire and the second grounding wire.

[0008] Preferably, a third grounding wire is connected to the positive output end of the bridge rectifier circuit or the wire or the first grounding wire on one side of the CBB capacitor input end or between the input end of the first capacitor and the first grounding wire, and a varistor is connected in series on the third grounding wire.

[0009] Preferably, the input EMI filter circuit is a π-type filter circuit.

[0010] Preferably, the input rectifier and filter circuit structure applied to the audio power module further includes a neutral line and at least one live line. The input EMI filter circuit includes a third capacitor, a resistor group, a first inductor, a fourth capacitor, and a second inductor arranged in sequence along the AC power transmission direction. The third capacitor is connected in series between the neutral line and the live line, the resistor group is connected in series between the neutral line and the live line, the first inductor is connected in series between the neutral line and the live line, the fourth capacitor is connected in series between the neutral line and the live line, and the second inductor is connected in series between the neutral line and the live line. The input end of the bridge rectifier circuit is respectively connected to the output end of the neutral line and the output end of the live line.

[0011] Preferably, a third capacitor is connected in series between each live wire and the neutral wire, a resistor group is connected in series between each live wire and the neutral wire, and a fourth capacitor is connected in series between each live wire and the neutral wire.

[0012] Preferably, the resistor group includes three first resistors connected in series.

[0013] Preferably, the input rectifier and filter circuit structure applied to the audio power module also includes a ground wire, a fifth capacitor is connected in series between the live wire and the ground wire on one side of the first inductor input end, and a sixth capacitor is connected in series between the live wire and the ground wire between the first inductor and the second inductor.

[0014] Preferably, the input end of the bridge rectifier circuit is connected to the output end of the input EMI filter circuit, the negative output end of the bridge rectifier circuit is connected to a fourth ground wire, a second resistor is connected in series to the fourth ground wire, and the input end of the input DC filter circuit is connected to the positive output end of the bridge rectifier circuit.

[0015] The beneficial effects of the present invention are as follows: in the input rectification and filtering circuit structure, by sequentially connecting the input EMI filtering circuit, the bridge rectifier circuit, and the input DC filtering circuit in series, not only can the input rectification and filtering circuit structure have very good rectification and filtering performance, but also can have very good anti-interference performance, thereby being conducive to improving the stability and quality of rectification and filtering, and further being conducive to outputting more stable electric energy. The input rectification and filtering circuit structure is conducive to greatly improving the performance of the audio power module. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1This is a structural diagram of the input rectification and filtering circuit structure in the utility model.

[0017] Figure 2 This is a structural diagram of the input EMI filter circuit in the utility model.

[0018] Figure 3 This is a structural diagram of the bridge rectifier circuit in the utility model.

[0019] Figure 4 This is a structural diagram of the input DC filter circuit in the utility model.

[0020] Figure 5 It is a partial structural diagram of the utility model in use. DETAILED DESCRIPTION

[0021] like Figure 1 As shown, the input rectification and filtering circuit structure applied to the audio power module described in the present invention includes an input EMI filtering circuit 1, a bridge rectifier circuit 2, and an input DC filtering circuit 3 connected in series.

[0022] In this input rectification and filtering circuit structure, by sequentially connecting the input EMI filter circuit 1, the bridge rectifier circuit 2, and the input DC filter circuit 3 in series, not only can the input rectification and filtering circuit structure have very good rectification and filtering performance, but also can make the input rectification and filtering circuit structure have very good anti-interference performance, thereby being conducive to improving the stability and quality of rectification and filtering, and thus being conducive to outputting more stable electric energy. This input rectification and filtering circuit structure is conducive to greatly improving the performance of the audio power supply module.

[0023] like Figure 1 and Figure 4As shown, the input DC filter circuit 3 includes a wire 31 connected to the positive output terminal of the bridge rectifier circuit 2, a plurality of first grounding wires 32 and a second grounding wire 33 connected in parallel to the wire 31, a plurality of CBB capacitors 34, and a plurality of capacitor banks 35. Each CBB capacitor 34 is connected in series to each first grounding wire 32. A first capacitor 36 connected in parallel to the CBB capacitor 34 is provided on the first grounding wire 32. Each capacitor bank 35 is connected in series between the wire 31 and the second grounding wire 33. Such an input DC filter circuit 3 has better filtering performance. The CBB capacitor 34 (also known as a polypropylene capacitor) has the advantages of small size, high power density, low loss, non-polarity, and surge protection. It can be used in high-power power supplies (for example, a power supply with a power of 30,000 watts, which is the highest power supply in the industry). It has a self-repair function and a service life of more than 10 years. Its resistance is small, which can reduce its loss, improve efficiency, reduce temperature, and increase its effective time. In addition, its small size can facilitate the formation of a lightweight structure, thereby further improving the performance and applicability of the pre-processing circuit device.

[0024] like Figure 4 As shown, in the actual manufacturing process, the first capacitor 36 is not connected in parallel to the first ground line 32 near the positive output end of the bridge rectifier circuit 2, which enables the input DC filter circuit 3 to have very good filtering performance, thereby helping to further improve the performance of the input rectifier filter circuit structure.

[0025] like Figure 4 As shown, the capacitor bank 35 includes a plurality of second capacitors 351, one of which is a high-voltage ceramic capacitor. Each second capacitor 351 is connected in series between the conductor 31 and the second grounding wire 33. This can further improve the filtering performance of the input DC filter circuit 3, thereby helping to further improve the reliability and applicability of the input rectifier filter circuit structure.

[0026] like Figure 4 As shown, a third grounding wire 37 is connected to the positive output terminal of the bridge rectifier circuit 2, or to the wire 31, or to the first grounding wire 32 on the input side of the CBB capacitor 34, or between the input terminal of the first capacitor 36 and the first grounding wire 32. A varistor 38 is connected in series to the third grounding wire 37. This provides voltage protection, which facilitates the output of more stable electrical energy, thereby helping to further improve the performance of the input rectifier and filter circuit structure.

[0027] like Figure 1 and Figure 2As shown, the input EMI filter circuit 1 is a π-type filter circuit. Such an input EMI filter circuit 1 can effectively suppress electromagnetic noise in the circuit, preventing it from interfering with the audio power module, thereby improving the performance of the audio power module.

[0028] like Figure 2 As shown, the input rectifier and filter circuit structure used in the audio power module also includes a neutral wire 4 and at least one live wire 5. The input EMI filter circuit 1 includes a third capacitor 11, a resistor group 12, a first inductor 13, a fourth capacitor 14, and a second inductor 15, which are arranged in sequence along the AC power transmission direction. The third capacitor 11 is connected in series between the neutral wire 4 and the live wire 5, the resistor group 12 is connected in series between the neutral wire 4 and the live wire 5, the first inductor 13 is connected in series between the neutral wire 4 and the live wire 5, the fourth capacitor 14 is connected in series between the neutral wire 4 and the live wire 5, and the second inductor 15 is connected in series between the neutral wire 4 and the live wire 5. The input end of the bridge rectifier circuit 2 is respectively connected to the output end of the neutral wire 4 and the output end of the live wire 5. This can make the input EMI filter circuit 1 have a very stable and reliable structure, thereby facilitating a very stable and reliable filtering effect, and further improving the performance of the input rectifier and filter circuit structure. Moreover, the input EMI filter circuit 1 can form a stable anti-interference filter circuit, with reduced current and voltage loops, less loss, improved efficiency, small conduction radiation, and can reduce material usage and reduce costs.

[0029] like Figure 2 As shown, the third capacitor 11 and the fourth capacitor 14 are both high-voltage film capacitors, and the first inductor 13 and the second inductor 15 are both common-mode inductors, which can better meet actual usage requirements.

[0030] like Figure 2 As shown, a third capacitor 11 is connected in series between each live wire 5 and the neutral wire 4, a resistor group 12 is connected in series between each live wire 5 and the neutral wire 4, and a fourth capacitor 14 is connected in series between each live wire 5 and the neutral wire 4. This ensures that the input EMI filter circuit 1 still has very high stability and reliability when multiple live wires 5 are provided, thereby ensuring that the input EMI filter circuit 1 has very good performance.

[0031] like Figure 2 As shown, the resistor group 12 includes three first resistors 121 connected in series. This can further improve the performance of the input EMI filter circuit 1, thereby helping to further improve the reliability of the input rectifier filter circuit structure.

[0032] like Figure 2As shown, the input rectifier and filter circuit structure used in the audio power module also includes a ground wire 6, a fifth capacitor 16 is connected in series between the live wire 5 and the ground wire 6 on the input side of the first inductor 13, and a sixth capacitor 17 is connected in series between the live wire 5 and the ground wire 6 between the first inductor 13 and the second inductor 15. This can further improve performance and safety.

[0033] like Figure 1 and Figure 3 As shown, the input end of the bridge rectifier circuit 2 is connected to the output end of the input EMI filter circuit 1. The negative output end of the bridge rectifier circuit 2 is connected to a fourth grounding wire 21, and a second resistor 22 is connected in series with the fourth grounding wire 21. The input end of the input DC filter circuit 3 is connected to the positive output end of the bridge rectifier circuit 2. This can further improve the performance of the bridge rectifier circuit 2. The second resistor 22 connected in series with the fourth grounding wire 21 can reduce inrush current, stabilize the output voltage, and protect the rectifier and load. The second resistor 22 can limit the instantaneous change of current in the circuit and reduce the occurrence of inrush current. This can also reduce system noise and protect the service life of related capacitors and diodes. At the same time, it can also improve the reliability and stability of the entire circuit, thereby helping to further improve the performance of the input rectifier and filter circuit structure.

[0034] When single-phase AC power is used, the bridge rectifier circuit 2 is composed of a single-phase bridge rectifier circuit. Figure 5 As shown, when using three-phase AC power, the bridge rectifier circuit 2 is composed of two rectifier bridges. The four input terminals of the two rectifier bridges are respectively connected to the three live wires and one neutral wire of the three-phase AC. The negative output terminals of the two rectifier bridges are connected and then grounded via a fourth grounding wire 21. The positive output terminals of the two rectifier bridges are both connected to a conductor 31. In actual use, the input terminal of the input EMI filter circuit 1 can be connected to the mains power through the protection circuit 10, and the output terminal of the input DC filter circuit 3 is connected to other circuit modules of the audio power module. This can meet the requirements of actual manufacturing and use.

Claims

1. An input rectifier and filter circuit structure applied to an audio power module, characterized by: The invention comprises an input EMI filter circuit (1), a bridge rectifier circuit (2), and an input DC filter circuit (3) which are sequentially connected in series.

2. The input rectifier and filter circuit structure used in the audio power module according to claim 1, characterized in that: The input DC filter circuit (3) comprises a conductor (31) connected to the positive output end of the bridge rectifier circuit (2), a plurality of first grounding wires (32) connected in parallel to the conductor (31), a second grounding wire (33), a plurality of CBB capacitors (34), and a plurality of capacitor groups (35), wherein each CBB capacitor (34) is connected in series to each first grounding wire (32), a first capacitor (36) connected in parallel to the CBB capacitor (34) is provided on the first grounding wire (32), and each capacitor group (35) is connected in series between the conductor (31) and the second grounding wire (33).

3. The input rectifier and filter circuit structure used in the audio power module according to claim 2, characterized in that: The capacitor group (35) includes a plurality of second capacitors (351), one of the second capacitors (351) is a high-voltage ceramic capacitor, and each second capacitor (351) is connected in series between the wire (31) and the second grounding wire (33).

4. The input rectifier and filter circuit structure used in an audio power module according to claim 2 or 3, characterized in that: A third grounding wire (37) is connected to the positive output end of the bridge rectifier circuit (2), or to the wire (31), or to the first grounding wire (32) on one side of the input end of the CBB capacitor (34), or between the input end of the first capacitor (36) and the first grounding wire (32), and a varistor (38) is connected in series to the third grounding wire (37).

5. The input rectifier and filter circuit structure used in the audio power module according to claim 1, characterized in that: The input EMI filter circuit (1) is a π-type filter circuit.

6. The input rectifier and filter circuit structure used in the audio power module according to claim 5, characterized in that: It also includes a neutral line (4) and at least one live line (5), and the input EMI filter circuit (1) includes a third capacitor (11), a resistor group (12), a first inductor (13), a fourth capacitor (14), and a second inductor (15) arranged in sequence along the AC power transmission direction, the third capacitor (11) is connected in series between the neutral line (4) and the live line (5), the resistor group (12) is connected in series between the neutral line (4) and the live line (5), the first inductor (13) is connected in series between the neutral line (4) and the live line (5), the fourth capacitor (14) is connected in series between the neutral line (4) and the live line (5), and the second inductor (15) is connected in series between the neutral line (4) and the live line (5), and the input end of the bridge rectifier circuit (2) is connected to the output end of the neutral line (4) and the output end of the live line (5), respectively.

7. The input rectifier and filter circuit structure used in the audio power module according to claim 6, characterized in that: A third capacitor (11) is connected in series between each live wire (5) and the neutral wire (4), a resistor group (12) is connected in series between each live wire (5) and the neutral wire (4), and a fourth capacitor (14) is connected in series between each live wire (5) and the neutral wire (4).

8. The input rectifier and filter circuit structure used in an audio power module according to claim 6 or 7, characterized in that: The resistor group (12) comprises three first resistors (121) connected in series.

9. The input rectifier and filter circuit structure used in an audio power module according to claim 6, characterized in that: It also includes a ground wire (6), a fifth capacitor (16) connected in series between the live wire (5) and the ground wire (6) on one side of the input end of the first inductor (13), and a sixth capacitor (17) connected in series between the live wire (5) and the ground wire (6) between the first inductor (13) and the second inductor (15).

10. The input rectifier and filter circuit structure used in the audio power module according to claim 1, characterized in that: The input end of the bridge rectifier circuit (2) is connected to the output end of the input EMI filter circuit (1); the negative output end of the bridge rectifier circuit (2) is connected to a fourth grounding wire (21); a second resistor (22) is connected in series to the fourth grounding wire (21); and the input end of the input DC filter circuit (3) is connected to the positive output end of the bridge rectifier circuit (2).

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