Front-end circuit structure applied to audio power module

Abstract

The utility model relates to the field of audio power supplies, in particular to a front-end circuit structure applied to an audio power supply module, which is characterized by comprising an anti-surge and anti-short-circuit circuit, an input filter circuit and a bridge rectifier circuit which are sequentially connected in series. According to the utility model, the anti-surge and anti-short-circuit effects can be realized at the same time, and the damage probability of related electronic components can be reduced, so that the service life of the audio equipment can be prolonged, and the occurrence of safety accidents can be reduced.

Description

Technical Field

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

[0002] Currently, most audio devices are equipped with a power module to convert alternating current (AC) into direct current (DC) for the device's electronic components. Existing power modules used in audio devices typically consist of a transformer module, a rectifier module, a filter module, and a voltage regulator module. While these power modules can convert AC to DC, they lack any protective circuitry. Surges or short circuits can easily damage the power module and / or the audio device's electronic components, shortening the device's lifespan and potentially leading to safety incidents. Therefore, it is crucial to design a pre-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 a front-end circuit structure applied to an audio power module. The front-end circuit structure can simultaneously play the role of surge protection and short-circuit protection, which can help reduce the probability of damage to related electronic components, thereby helping to extend the service life of audio equipment and reduce the occurrence of safety accidents.

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

[0005] A front-end circuit structure applied to an audio power module is characterized in that it comprises a surge protection and short-circuit prevention circuit, an input filtering circuit, and a bridge rectifier circuit which are sequentially connected in series.

[0006] Preferably, the front-end circuit structure applied to the audio power module also includes a neutral wire and at least one live wire. The surge and short-circuit protection circuit includes a first fuse and a first thermistor connected in series on the neutral wire, a second fuse and a second thermistor connected in series on the live wire, and a varistor connected in series between the live wire and the neutral wire. The input filter circuit is arranged at the output end of the neutral wire and the output end of the live wire.

[0007] Preferably, a varistor is connected in series between each live wire and the neutral wire.

[0008] Preferably, the first fuse and the first thermistor on the neutral line are connected in series in sequence along the direction from the input end of the neutral line to the output end of the neutral line, the second fuse and the second thermistor on the live line are connected in series in sequence along the direction from the input end of the live line to the output end of the live line, and the two ends of the varistor are respectively electrically connected to the neutral line between the first fuse and the first thermistor, and to the live line between the second fuse and the second thermistor.

[0009] Preferably, there are one or three live wires.

[0010] Preferably, the input filter circuit is a π-type filter circuit.

[0011] Preferably, the input filter circuit includes a first capacitor, a resistor group, a first inductor, a second capacitor, and a second inductor arranged in sequence along the AC power transmission direction, the first 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 second capacitor is connected in series between the neutral line and the live line, the second inductor is connected in series between the neutral line and the live line, and the input end of the bridge rectifier circuit is respectively connected to the output end of the neutral line and the live line.

[0012] Preferably, a first 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 second capacitor is connected in series between each live wire and the neutral wire.

[0013] Preferably, the resistor group includes three resistors connected in series.

[0014] Preferably, the front-end circuit structure applied to the audio power module also includes a ground wire, a third capacitor is connected in series between the live wire and the ground wire between the second thermistor and the first inductor, and a fourth capacitor is connected in series between the live wire and the ground wire between the first inductor and the second inductor.

[0015] The beneficial effects of the present invention are as follows: in the front-end circuit structure, by sequentially connecting the surge and short-circuit protection circuit, the input filter circuit, and the bridge rectifier circuit in series, the surge and short-circuit protection circuit can be used at the head end to play the role of surge protection and short-circuit protection, which can better prevent the adverse damage caused by surge and short circuit, and can help reduce the probability of damage to related electronic components, thereby helping to extend the service life of the audio equipment, and can reduce the occurrence of safety accidents, and thus can help greatly improve the safety of the use of audio equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the circuit structure of the front circuit structure in the utility model. DETAILED DESCRIPTION

[0017] like Figure 1As shown, the front-end circuit structure applied to the audio power module described in the present invention includes an anti-surge and anti-short-circuit circuit 1, an input filter circuit 2, and a bridge rectifier circuit 3 which are sequentially connected in series.

[0018] In this front-end circuit structure, by sequentially connecting the surge and short-circuit protection circuit 1, the input filter circuit 2, and the bridge rectifier circuit 3 in series, the surge and short-circuit protection circuit 1 can be used at the head end to play the role of surge protection and short-circuit protection, which can better prevent the adverse damage caused by surges and short circuits, and can help reduce the probability of damage to related electronic components, thereby helping to extend the service life of the audio equipment, and can reduce the occurrence of safety accidents, and thus can help greatly improve the safety of the use of audio equipment.

[0019] The front circuit structure is located at the input end of the audio power module, so that it can play a protective role on the audio power module, thereby meeting the needs of actual use.

[0020] like Figure 1 As shown, the preamplifier circuit structure used in the audio power module also includes a neutral wire 4 and at least one live wire 5. The surge and short-circuit protection circuit 1 includes a first fuse 11 and a first thermistor 12 connected in series to the neutral wire 4, a second fuse 13 and a second thermistor 14 connected in series to the live wire 5, and a varistor 15 connected in series between the live wire 5 and the neutral wire 4. The input filter circuit 2 is provided at the output ends of the neutral wire 4 and the live wire 5. This surge and short-circuit protection circuit 1 is very simple and reliable, which not only facilitates manufacturing but also provides very reliable surge and short-circuit protection, thereby helping to improve the reliability and applicability of the preamplifier circuit structure.

[0021] like Figure 1 As shown, a varistor 15 is connected in series between each live wire 5 and the neutral wire 4. This allows the surge and short-circuit protection circuit 1 to have a very stable and reliable protection effect when multiple live wires 5 are provided, thereby further improving the reliability and applicability of the pre-circuit structure.

[0022] like Figure 1 As shown, the first fuse 11 and the first thermistor 12 on the neutral line 4 are connected in series in a direction from the input end of the neutral line 4 to the output end of the neutral line 4. The second fuse 13 and the second thermistor 14 on the live line 5 are connected in series in a direction from the input end of the live line 5 to the output end of the live line 5. The two ends of the varistor 15 are respectively electrically connected to the neutral line 4 between the first fuse 11 and the first thermistor 12, and to the live line 5 between the second fuse 13 and the second thermistor 14. Such a surge and short-circuit protection circuit 1 can provide a more stable and reliable surge and short-circuit protection function, thereby further improving safety in use.

[0023] like Figure 1 As shown, there are one or three live wires 5. This makes it easy to select single-phase 100-240VAC or three-phase 380VAC as needed, and has a very wide range of applications.

[0024] like Figure 1 As shown, the input filter circuit 2 is a π-type filter circuit. Such an input filter circuit 2 can suppress electromagnetic noise in the circuit and prevent it from interfering with the audio power module, thereby enabling the audio power module to have better performance.

[0025] like Figure 1 As shown, the input filter circuit 2 includes a first capacitor 21, a resistor group 22, a first inductor 23, a second capacitor 24, and a second inductor 25, which are sequentially arranged along the AC transmission direction. The first capacitor 21 is connected in series between the neutral line 4 and the live line 5, the resistor group 22 is connected in series between the neutral line 4 and the live line 5, the first inductor 23 is connected in series between the neutral line 4 and the live line 5, the second capacitor 24 is connected in series between the neutral line 4 and the live line 5, and the second inductor 25 is connected in series between the neutral line 4 and the live line 5. The input end of the bridge rectifier circuit 3 is connected to the output end of the neutral line 4 and the live line 5, respectively. This can make the input filter circuit 2 have a very stable and reliable structure, thereby facilitating the achievement of a very stable and reliable filtering effect, thereby improving the performance of the pre-circuit structure. Moreover, the input filter circuit 2 can constitute a stable anti-interference filter circuit with reduced current and voltage loops, low loss, improved efficiency, low conduction and radiation, and can reduce material usage and reduce costs.

[0026] like Figure 1 As shown, the first capacitor 21 and the second capacitor 24 are both high-voltage film capacitors, and the first inductor 23 and the second inductor 25 are both common-mode inductors, which can better meet actual usage requirements.

[0027] like Figure 1 As shown, a first capacitor 21 is connected in series between each live wire 5 and the neutral wire 4, a resistor group 22 is connected in series between each live wire 5 and the neutral wire 4, and a second capacitor 24 is connected in series between each live wire 5 and the neutral wire 4. This ensures that the input filter circuit 2 still has very high stability and reliability when multiple live wires 5 are provided, thereby ensuring that the input filter circuit 2 has very good performance.

[0028] like Figure 1 As shown, the resistor group 22 includes three resistors 221 connected in series. This can further improve the performance of the input filter circuit 2, thereby helping to further improve the reliability of the pre-circuit structure.

[0029] like Figure 1As shown, the front-end circuit structure used in the audio power module also includes a ground wire 6, a third capacitor 61 connected in series between the live wire 5 and the ground wire 6 between the second thermistor 14 and the first inductor 23, and a fourth capacitor 62 connected in series between the live wire 5 and the ground wire 6 between the first inductor 23 and the second inductor 25. This can further improve performance and safety.

[0030] When single-phase AC power is used, the bridge rectifier circuit 3 is composed of a single-phase bridge rectifier circuit. Figure 1 As shown, when three-phase AC power is used, the bridge rectifier circuit 3 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 power. The negative output terminals of the two rectifier bridges are connected and then grounded via a ground wire 6. A resistor R22 is connected in series with the ground wire 6. The positive output terminals of the two rectifier bridges are connected and then output via an output wire 10. Connecting resistor R22 in series with the ground wire 6 can reduce inrush current, stabilize the output voltage, and protect the rectifier and load. The resistor R22 can limit the instantaneous change of current in the circuit, reducing 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. In actual use, the output wire 10 is connected to other electronic components of the audio power module, which can meet the needs of actual manufacturing and use.

Claims

1. A front-end circuit structure applied to an audio power module, characterized by: The invention comprises a surge protection and short circuit prevention circuit (1), an input filter circuit (2), and a bridge rectifier circuit (3) which are sequentially connected in series.

2. The front-end circuit structure applied to the audio power module according to claim 1, characterized in that: It also includes a neutral line (4) and at least one live line (5), the surge and short-circuit prevention circuit (1) includes a first fuse (11) and a first thermistor (12) connected in series on the neutral line (4), a second fuse (13) and a second thermistor (14) connected in series on the live line (5), and a varistor (15) connected in series between the live line (5) and the neutral line (4), and the input filter circuit (2) is arranged at the output end of the neutral line (4) and the output end of the live line (5).

3. The front-end circuit structure applied to the audio power module according to claim 2, characterized in that: A varistor (15) is connected in series between each live wire (5) and the neutral wire (4).

4. The front-end circuit structure applied to the audio power module according to claim 2 or 3, characterized in that: The first fuse (11) and the first thermistor (12) on the neutral line (4) are connected in series in sequence along the direction from the input end of the neutral line (4) to the output end of the neutral line (4); the second fuse (13) and the second thermistor (14) on the live line (5) are connected in series in sequence along the direction from the input end of the live line (5) to the output end of the live line (5); and the two ends of the varistor (15) are electrically connected to the neutral line (4) between the first fuse (11) and the first thermistor (12), and to the live line (5) between the second fuse (13) and the second thermistor (14).

5. The front-end circuit structure applied to the audio power module according to claim 2, characterized in that: There are one or three live wires (5).

6. The front-end circuit structure applied to the audio power module according to claim 2, characterized in that: The input filter circuit (2) is a π-type filter circuit.

7. The front-end circuit structure applied to the audio power module according to claim 6, characterized in that: The input filter circuit (2) comprises a first capacitor (21), a resistor group (22), a first inductor (23), a second capacitor (24), and a second inductor (25) which are sequentially arranged along the AC power transmission direction. The first capacitor (21) is connected in series between the neutral line (4) and the live line (5), the resistor group (22) is connected in series between the neutral line (4) and the live line (5), the first inductor (23) is connected in series between the neutral line (4) and the live line (5), the second capacitor (24) is connected in series between the neutral line (4) and the live line (5), and the second inductor (25) is connected in series between the neutral line (4) and the live line (5). The input end of the bridge rectifier circuit (3) is connected to the output end of the neutral line (4) and the live line (5), respectively.

8. The front-end circuit structure applied to the audio power module according to claim 7, characterized in that: A first capacitor (21) is connected in series between each live wire (5) and the neutral wire (4), a resistor group (22) is connected in series between each live wire (5) and the neutral wire (4), and a second capacitor (24) is connected in series between each live wire (5) and the neutral wire (4).

9. The front-end circuit structure applied to the audio power module according to claim 7 or 8, characterized in that: The resistor group (22) includes three resistors (221) connected in series.

10. The front-end circuit structure applied to the audio power module according to claim 7, characterized in that: The invention also includes a ground wire (6), a third capacitor (61) connected in series between the live wire (5) between the second thermistor (14) and the first inductor (23) and the ground wire (6), and a fourth capacitor (62) connected in series between the live wire (5) between the first inductor (23) and the second inductor (25) and the ground wire (6).

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