An audio switching drive circuit for a magneto-electric loudspeaker

Abstract

The utility model discloses an audio frequency switching drive circuit for magnetoelectric loudspeaker, is arranged on the PCB board of setting in magnetoelectric loudspeaker, and working circuit includes: first audio frequency circuit, second audio frequency circuit in front end parallel, and the switching drive branch of rear end connection, every audio frequency circuit structure is same, and all includes: the sound signal branch, power amplifier branch of connection in proper order and the power supply branch of being connected with sound signal branch, power amplifier branch respectively, the input end switching different audio input signal of switching drive branch, and the coil of magnetoelectric loudspeaker is connected to the output end, and the coil energization generates the magnetic field and makes loudspeaker internal diaphragm vibration and sends out different audio sound.

Description

Technical Field

[0001] This utility model belongs to the field of automotive parts, specifically relating to an audio switching drive circuit for a magnetoelectric loudspeaker. Background Technology

[0002] Traditional magneto-electric loudspeakers have limited functionality, often only capable of playing a single type of sound signal and unable to switch between different sound modes according to various application scenarios and needs. For example, in the automotive industry, loudspeakers need to be able to switch between playing horn sounds and emitting low-speed warning sounds. Existing solutions often employ software control or complex system integration to achieve sound switching, which not only increases costs but may also lead to reduced system stability and slow response times. Meanwhile, multi-functional magneto-electric loudspeakers that control sound switching purely through hardware circuitry are rare, and those that do exist suffer from drawbacks such as complex circuit structures and poor switching performance. Utility Model Content

[0003] The purpose of this invention is to provide an audio switching drive circuit for a magnetoelectric loudspeaker. Through reliable hardware circuit design, it enables fast and stable switching between two sound signals to meet the multi-functional needs of loudspeakers in different scenarios.

[0004] The above objectives are achieved through the following technical solutions:

[0005] An audio switching drive circuit for a magnetoelectric loudspeaker includes a PCB board inside the loudspeaker. The PCB board has a working circuit comprising: a first audio circuit and a second audio circuit connected in parallel at the front end, and a switching drive branch connected at the rear end. Each audio circuit has the same structure, including: a sound signal branch and a power amplification branch connected in sequence, and a power supply branch connected to the sound signal branch and the power amplification branch respectively. The input end of the switching drive branch switches between different audio input signals, and the output end is connected to the coil of the magnetoelectric loudspeaker. When the coil is energized, it generates a magnetic field that causes the diaphragm inside the loudspeaker to vibrate and produce different audio sounds.

[0006] The power supply branch includes: an external +13V power supply is input to the IN pin of the power module U1 via diode D1, and the OUT pin of the power module U1 outputs a +5V power supply.

[0007] The connection relationship of the audio signal branch circuit includes: the VCC_PWM pin of the audio storage module U2 is connected to the +5V power supply and grounded through capacitors C1 and C2 respectively; the VCCD pin of the audio storage module U2 is connected to the +5V power supply and grounded through capacitors C3 and C4 respectively; the output terminals SPK+ and SPK- of the audio storage module U2 output the first audio differential digital signal (a1, b1) and connect it to the power amplifier branch.

[0008] The power amplification branch connection relationship includes: the SDZ and FAULTZ pins of the power amplifier module U3 are both connected to the +5V power supply output of the power supply branch through resistor R5, and the VCC pin is connected to the external +13V power supply; the SPK+ and SPK- pins of the voice storage module U2 are connected to the RINP and RINN pins of the power module U3 through capacitors C6 and C8, respectively; the BSPR pin is connected to the OUTNR pin through capacitor C9, the BSPL pin is connected to the OUTNL pin through capacitor C10, and the OUTNR and OUTNL pins are used as output terminals to output the first audio differential analog signals (a2, b2) and connect to the switching drive branch.

[0009] The first audio differential digital signal (a1, b1) is also connected to the power amplifier module U3 through an RC filter branch. The RC filter branch connection includes two identical circuit structures: the SPK+ pin of the voice storage module U2 is connected to the capacitor C6 through the resistor R1, and a wire is also led out between the resistor R1 and the capacitor C6 and grounded through the capacitor C5; the SPK- pin of the voice storage module U2 is connected to the capacitor C8 through the resistor R2, and a wire is also led out between the resistor R2 and the capacitor C8 and grounded through the capacitor C7.

[0010] The first audio differential analog signal (a2, b2) is also connected to the switching drive branch through the LC filter branch. The connection relationship of the LC filter branch includes: the OUTNR pin is connected to the switching drive branch through inductor L1, and inductor L1 is also grounded through capacitor C11; the OUTNL pin is connected to the switching drive branch through inductor L2, and inductor L2 is also grounded through capacitor C12.

[0011] The GAIN / SLV pin of the power module U3 is also connected to an external resistor gain adjustment branch. The connection relationship of the external resistor gain adjustment branch includes: GVDD is grounded through resistors R3 and R4, and resistors R3 and R4 are connected to the GAIN / SLV pin of the power module U3.

[0012] The switching drive branch uses a signal switching module U4, which has two pairs of input terminals. One pair (NO1, NO2) pins are connected to the two output terminals of the LC filter branch of the first audio circuit to acquire the first audio differential digital signals (a1, b1); the other pair (NC1, NC2) pins are connected to the two output terminals of the LC filter branch of the second audio circuit to acquire the second audio differential digital signals (c1, d1); the COM1 and COM2 pins are connected to the internal coil of the magnetoelectric speaker as the output terminals of the switching drive branch.

[0013] The resistors are surface mount resistors, the capacitors are ceramic capacitors, and the inductors are power inductors.

[0014] This utility model has the following beneficial effects and advantages:

[0015] 1. Based on the inherent principle of loudspeakers, this invention uses circuit design to select different audio signals, thereby widening the loudspeaker's frequency range to an ultra-wide 20Hz-20kHz band. Its advantage lies in its ability to fully reproduce various frequency components of the audio signal, including deep bass, rich midrange, and bright treble, thus providing a comprehensive and natural sound performance. It can accurately reproduce the details and characteristics of the original audio signal, reducing frequency and phase distortion.

[0016] 2. The power amplifier module used in this invention has high conversion efficiency, which reduces the energy consumption of the entire system while ensuring sufficient sound volume. Furthermore, the amplification gain can be adjusted by external resistor matching.

[0017] 3. The voice storage module used in this invention can pre-store various types of sound files, with a high sampling rate and high sound reproduction accuracy. Furthermore, the signal stored in the voice chip can be converted into an analog signal that can be recognized by the power amplifier chip through an RC filter circuit. The voice storage module has high-speed data reading capabilities and internal control logic circuitry. When a playback command is issued, it can transmit the stored audio data to the power amplifier module in a very short time, thereby driving the speaker to produce sound. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the circuit structure of this utility model;

[0019] Figure 2 This is a schematic diagram of an audio switching drive circuit for a magnetoelectric loudspeaker according to the present invention. Detailed Implementation

[0020] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific implementation methods of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the utility model. Therefore, this utility model is not limited to the specific implementations disclosed below.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0022] like Figure 1 The diagram shows a sound switching drive circuit for a magnetoelectric loudspeaker according to this invention. In this example, the sound switching drive circuit is arranged on a PCB board inside the magnetoelectric loudspeaker. The PCB board has a working circuit, which includes: a first audio circuit and a second audio circuit connected in parallel at the front end, and a switching drive branch connected at the rear end. Each audio circuit has the same structure, including: a sound signal branch and a power amplification branch connected in sequence, and a power supply branch connected to the sound signal branch and the power amplification branch respectively. The input end of the switching drive branch switches between different audio input signals, and the output end is connected to the coil of the magnetoelectric loudspeaker. When the coil is energized, it generates a magnetic field that causes the diaphragm inside the loudspeaker to vibrate and produce different audio sounds.

[0023] like Figure 2 The diagram shown is a circuit schematic of this utility model, which includes: power supply branch, sound signal branch circuit, RC filter branch, power amplifier branch, external resistor gain adjustment branch, LC filter branch, and switching drive branch.

[0024] The power supply branch has the following connection: an external +13V power supply is input to the IN pin of the power module U1 via diode D1, and the OUT pin of the power module U1 outputs +5V power to supply the audio signal branch and the power amplification branch.

[0025] The power module uses an LDO converter chip, and high-performance, highly stable chips are selected during the selection process.

[0026] The audio signal branch circuit has the following connections: the VCC_PWM pin of the voice storage module U2 is connected to the +5V power supply and grounded through capacitors C1 and C2 respectively; the VCCD pin of the voice storage module U2 is connected to the +5V power supply and grounded after being filtered through capacitors C3 and C4 respectively (to make the output voltage more stable); the output terminals SPK+ and SPK- of the voice storage module U2 output the first audio differential digital signal (a1, b1) as the output terminals, which is then fed to the power amplifier branch through the RC filter branch.

[0027] Working principle: The voice storage module uses a chip with large storage capacity, high sampling rate and low power consumption to perform internal digital processing of audio signals, convert digital audio data into pulse code modulation (PCM) signals, and output a pair of differential signals (a1, b1).

[0028] The power amplification branch connections are as follows: the SDZ and FAULTZ pins of power amplifier module U3 are both connected to the +5V power supply output from the power supply branch via resistor R5; the VCC pin is connected to an external +13V power supply; the SPK+ and SPK- pins are connected to the RINP and RINN pins of power module U3 via RC filters, capacitors C6 and C8 respectively; the BSPR pin is connected to the OUTNR pin via capacitor C9, and the BSPL pin is connected to the OUTNL pin via capacitor C10; the OUTNR and OUTNL pins output the first audio differential analog signals (a2, b2), which are then connected to the switching drive branch via an LC filter. The GAIN / SLV pins are also connected to an external resistor for gain adjustment.

[0029] Working principle: The power amplifier module uses a highly efficient and stable chip with adjustable gain via external resistors to amplify audio signals.

[0030] The RC filter branch has two identical circuit structures: the SPK+ pin is connected to capacitor C6 via resistor R1, and a wire is also led out between resistor R1 and capacitor C6 and grounded via capacitor C5; the SPK- pin is connected to capacitor C8 via resistor R2, and a wire is also led out between resistor R2 and capacitor C8 and grounded via capacitor C7.

[0031] Working principle: The first audio differential digital signal (a1, b1) is filtered by two RC filters R1, C5 and R2, C7, and then the PCM signal (a1, b1) is converted into an analog audio signal for output.

[0032] The LC filter branch has the following connections: the OUTNR pin is connected to the switching drive branch through inductor L1, and inductor L1 is also grounded through capacitor C11; the OUTNL pin is connected to the switching drive branch through inductor L2, and inductor L2 is also grounded through capacitor C12.

[0033] Working principle: Signals processed by the LC filter module are less susceptible to conducted interference from the line.

[0034] The external resistor adjustment gain branch has the following connection: GVDD is grounded through external resistors R3 and R4, and the GAIN / SLV pin is connected between resistors R3 and R4.

[0035] Working principle: The signal gain of the power amplifier module is adjusted by external resistors R3 and R4, including processing of single-ended and differential signals, and processing of different amplification gains.

[0036] The switching drive branch uses a signal switching module U4. It has two pairs of input terminals. One pair (NO1, NO2) is connected to the two outputs of the LC filter branch of the first audio circuit to acquire the first audio differential digital signals (a1, b1). The other pair (NC1, NC2) is connected to the two outputs of the LC filter branch of the second audio circuit to acquire the second audio differential digital signals (c1, d1). The COM1 and COM2 pins are connected to the internal coils of the magnetoelectric speaker as outputs of the switching drive branch.

[0037] Working principle: The signal switching module U4 selects a converter (CO) type relay with high sensitivity, high reliability, and long mechanical life. The signal switching module U4 includes switching between two different sound modes (first audio and second audio), selecting the signal to be played and transmitting it to the speaker coil. These two sounds do not sound simultaneously.

[0038] In this example, the power supply module U1 uses a TPL820F50 chip; the voice storage module U2 uses an ISD2360 chip; the power amplifier module U3 uses a TPA3116 chip; the conversion relay U4 uses an AGQ200 chip; surface mount resistors are used, ceramic capacitors are used, and power inductors are used.

[0039] Furthermore, the magnetoelectric loudspeaker in this example can adopt a conventional structure. Its components include a front cover, located at the front of the loudspeaker, primarily serving a protective and decorative function; a sound cavity beneath the front cover, which is the space for sound propagation and resonance, and whose shape and size affect the loudspeaker's sound quality and timbre; a diaphragm and coil beneath the sound cavity, where a magnetic field is generated by current flowing through the coil, causing the diaphragm to vibrate, thereby pushing air to generate sound waves and emitting sound outwards. The diaphragm and coil are glued to a pressure plate using an adhesive process. The pressure plate is used to fix the diaphragm and coil, ensuring their relative positional stability during operation, and also provides some support; an upper clamping plate, pole pieces, neodymium iron boron magnets, and U-shaped iron magnets form a magnetic circuit unit, which provides a strong magnetic field; the magnetic circuit unit is fixed together with the front cover and pressure plate by screws, forming a stable structure that provides the necessary conditions for the coil to vibrate in the magnetic field.

[0040] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the present utility model. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. An audio switching drive circuit for a magnetoelectric loudspeaker, characterized in that, A PCB board is installed inside the magnetoelectric loudspeaker. The PCB board has a working circuit, which includes a first audio circuit and a second audio circuit connected in parallel at the front end, and a switching drive branch connected at the rear end. Each audio circuit has the same structure, including a sound signal branch and a power amplification branch connected in sequence, and a power supply branch connected to the sound signal branch and the power amplification branch respectively. The input end of the switching drive branch switches different audio input signals, and the output end is connected to the coil of the magnetoelectric loudspeaker. When the coil is energized, it generates a magnetic field that causes the diaphragm inside the loudspeaker to vibrate and produce different audio sounds.

2. The audio switching drive circuit for a magnetoelectric loudspeaker according to claim 1, characterized in that, The power supply branch includes: an external +13V power supply is input to the IN pin of the power module U1 via diode D1, and the OUT pin of the power module U1 outputs a +5V power supply.

3. The audio switching drive circuit for a magnetoelectric loudspeaker according to claim 1, characterized in that, The connection relationship of the audio signal branch circuit includes: the VCC_PWM pin of the voice storage module U2 is connected to the +5V power supply and grounded through capacitors C1 and C2 respectively; the VCCD pin of the voice storage module U2 is connected to the +5V power supply and grounded through capacitors C3 and C4 respectively; the output terminals SPK+ and SPK- of the voice storage module U2 output the first audio differential digital signal (a1, b1) and connect it to the power amplifier branch.

4. The audio switching drive circuit for a magnetoelectric loudspeaker according to claim 1, characterized in that, The power amplification branch connection relationship includes: the SDZ and FAULTZ pins of the power amplifier module U3 are both connected to the +5V power supply output of the power supply branch through resistor R5, and the VCC pin is connected to the external +13V power supply; the SPK+ and SPK- pins of the voice storage module U2 are connected to the RINP and RINN pins of the power module U3 through capacitors C6 and C8 respectively; the BSPR pin is connected to the OUTNR pin through capacitor C9, the BSPL pin is connected to the OUTNL pin through capacitor C10, and the OUTNR and OUTNL pins are used as output terminals to output the first audio differential analog signal (a2, b2) and connect to the switching drive branch.

5. The audio switching drive circuit for a magnetoelectric loudspeaker according to claim 3, characterized in that, The first audio differential digital signal (a1, b1) is also connected to the power amplifier module U3 through an RC filter branch. The RC filter branch connection includes two identical circuit structures: the SPK+ pin of the voice storage module U2 is connected to the capacitor C6 through the resistor R1, and a wire is also led out between the resistor R1 and the capacitor C6 and grounded through the capacitor C5; the SPK- pin of the voice storage module U2 is connected to the capacitor C8 through the resistor R2, and a wire is also led out between the resistor R2 and the capacitor C8 and grounded through the capacitor C7.

6. The audio switching drive circuit for a magnetoelectric loudspeaker according to claim 4, characterized in that, The first audio differential analog signal (a2, b2) is also connected to the switching drive branch through the LC filter branch. The connection relationship of the LC filter branch includes: the OUTNR pin is connected to the switching drive branch through inductor L1, and inductor L1 is also grounded through capacitor C11; the OUTNL pin is connected to the switching drive branch through inductor L2, and inductor L2 is also grounded through capacitor C12.

7. The audio switching drive circuit for a magnetoelectric loudspeaker according to claim 4, characterized in that, The GAIN / SLV pin of the power module U3 is also connected to an external resistor gain adjustment branch. The connection relationship of the external resistor gain adjustment branch includes: GVDD is grounded through resistors R3 and R4, and resistors R3 and R4 are connected to the GAIN / SLV pin of the power module U3.

8. The audio switching drive circuit for a magnetoelectric loudspeaker according to claim 1, characterized in that, The switching drive branch uses a signal switching module U4, which has two pairs of input terminals. One pair (NO1, NO2) pins are connected to the two output terminals of the LC filter branch of the first audio circuit to acquire the first audio differential digital signal (a1, b1). The other pair (NC1, NC2) pins are connected to the two output terminals of the LC filter branch of the second audio circuit to acquire the second audio differential digital signal (c1, d1). The COM1 and COM2 pins are connected to the internal coil of the magnetoelectric speaker as the output terminals of the switching drive branch.

9. An audio switching drive circuit for a magnetoelectric loudspeaker according to any one of claims 4, 5, and 7, characterized in that, Resistors R1, R2, R3, R4, and R5 are surface mount resistors, capacitors are ceramic capacitors, and inductors are power inductors.

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