A three-position switch structure for a horn

Abstract

This invention proposes a three-position switching structure for a speaker, comprising a first PCBA board, a second PCBA board, a switch conversion connector, a second power connector header, and a power connector header interface. Without increasing the width and volume of the PCBA board, this invention splits the total circuitry across two PCBA boards through a stacked arrangement, thereby reducing the number of traces on a single PCBA board and increasing the trace diameter on a single-layer PCBA board, thus meeting the high-current operating requirements in practical scenarios. Simultaneously, this invention can form three circuit paths with different resistance values, thereby covering the impedance requirements of more power amplifiers and improving device compatibility and application scenarios.

Description

Technical Field

[0001] This invention relates to the field of switch technology, specifically to a three-position horn-type selector switch structure. Background Technology

[0002] In electroacoustic systems, speaker resistance matching directly affects the efficiency and output sound quality of the power amplifier. It requires adjusting the resistance of the speaker control circuit to achieve compatibility with amplifiers of different power ranges. Existing speaker resistance adjustment circuits mostly employ the conventional design logic of switching local resistance branches, but their application has significant limitations: on the one hand, they face prominent contradictions in size, layout compatibility, and current carrying capacity. Miniaturized speakers (such as miniature speakers in portable devices) have stringent requirements for the size of the control circuit, while achieving three or more resistance levels requires increasing the number of resistors and wiring length, easily exceeding space limitations and failing to meet the installation requirements of small speakers. More importantly, the trace diameter of a single-layer PCBA is limited (minimum 0.3mm corresponds to a maximum current carrying capacity of 0.975A, maximum 3.0mm corresponds to a maximum current carrying capacity of 9.28A), far from meeting the high current requirement of 19.35A in practical scenarios. On the other hand, there is the issue of sensitivity to current effects. An unreasonable resistor and wiring layout can generate parasitic inductance and capacitance, causing current fluctuations that affect speaker output performance. Even if a two-stage resistor layout can achieve a certain balance between size and current stability, it is difficult to apply to high-current speaker scenarios due to the narrow range of compatible amplifiers and the short current-carrying capacity of single-layer PCBAs. At the same time, under the dual constraints of "small size + sensitivity to current effects", the existing solution can only achieve two-stage resistor transformation, which cannot cover the impedance requirements of more power amplifiers, resulting in poor device compatibility and limited application scenarios.

[0003] Therefore, there is an urgent need for a speaker control structure that can achieve three levels of resistance conversion within a limited volume, in order to break through the existing technological bottlenecks. Summary of the Invention

[0004] The purpose of this invention is to provide a three-position switching structure for a horn that does not have at least one of the disadvantages mentioned above.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a three-position switching structure for a speaker, comprising a first PCBA board, a second PCBA board, and a switch conversion connector; the first PCBA board and the second PCBA board are electrically connected, and there is a gap between them; the second PCBA board is provided with a plurality of second power connectors, the second power connectors passing through through holes in the first PCBA board, and the plurality of second power connectors and a plurality of first power connectors on the first PCBA board are combined to form three independent power connector interfaces; the switch conversion connector can selectively be plugged into any one of the power connector interfaces to form three circuit paths with different resistance values.

[0006] Furthermore, the second power connector has 11 pins, and the first power connector has 13 pins. The ends of the first power connector and the second power connector are flush. The 13 first power connectors and the 11 second power connectors are arranged in a 4×6 array to form three independent power connector interfaces.

[0007] Furthermore, the switch conversion connector includes a socket with a 2x4 array of jacks; the socket has 4 springs, each of which is used to connect two jacks in the same column but different rows; the socket can be selectively inserted into the 1st and 2nd rows of the 4×6 array of power headers, or the 3rd and 4th rows of power headers, or the 5th and 6th rows of power headers, to form three circuit paths with different resistance values.

[0008] Furthermore, the first PCBA board and the second PCBA board are electrically connected via eight conductive pins.

[0009] Furthermore, taking the direction of looking directly at the first PCBA board as the observation direction, in the 4×6 array of power connector pin headers, the power connector pins in the first row are, in order, connection points B1, B2, D1, and D2; the power connector pins in the second row are, in order, connection points A1, A2, C1, and C2. The power header pins in the third row are, in order, B1, B2, D1, and D2; the power header pins in the fourth row are, in order, A2, no-impedance, C1, and C2. The pin headers in the fifth row are sequentially set to connection points B1, no impedance, D1, and D2; the pin headers in the sixth row are sequentially set to connection points A2, no impedance, C2, and no impedance. The eight conductive pins used to connect the first PCBA board and the second PCBA board are, in order: D1 connection point, C1 connection point, B1 connection point, A1 connection point, A2 connection point, B2 connection point, C2 connection point and D2 connection point; Among them, the connection points with the same name are connected, and the connection point B2 is connected to the connection point C1; A first resistive element is provided between connection points A1 and A2, a second resistive element is provided between connection points B1 and B2, a third resistive element is provided between connection points C1 and C2, and a fourth resistive element is provided between connection points D1 and D2.

[0010] Furthermore, when the power strip is connected to the first and second rows of power strip pins in the 4×6 array, the total resistance element formed by the parallel connection of the first and second resistance elements and the total resistance element formed by the parallel connection of the third and fourth resistance elements are connected in series in the circuit to form the first impedance circuit.

[0011] Furthermore, when the power connector is plugged into the third and fourth rows of power connector pins in the 4×6 array, the total resistance element formed by the parallel connection of the third and fourth resistance elements, together with the first and second resistance elements, forms a second impedance circuit in the circuit.

[0012] Furthermore, when the socket is connected to the 5th and 6th rows of power connectors in the 4×6 array, the first, second, third and fourth resistive elements are connected in series in the circuit to form a third impedance circuit.

[0013] Furthermore, the 11 second power connector pins correspond to the B2 and D1 connection points in the first row; the A2 and C1 connection points in the second row; the B2 and D1 connection points in the third row; the A2 connection point, the impedance-free connection point, and the C1 connection point in the fourth row; the D1 connection point in the fifth row; and the A2 connection point in the sixth row.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: Without increasing the width and volume of the PCBA board, the present invention splits the total circuit on two PCBA boards by stacking two PCBA boards, thereby reducing the traces in a single PCBA board and increasing the trace diameter of a single-layer PCBA board, thus meeting the high current operating requirements in practical scenarios; at the same time, the present invention can form three circuit paths with different resistance values, thereby covering the impedance requirements of more power amplifiers and improving equipment adaptability and application scenarios. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the circuit layout principle in this invention; Figure 3 This is a schematic diagram of the front of the first PCB board and the front of the second PCB board.

[0017] The components include: 1. Second PCB board; 2. First PCB board; 3. Switch conversion connector; 4. Power connector pin; 5. Conductive connector pin; 6. Spring. Detailed Implementation

[0018] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0019] Example: Please refer to Figures 1-3 A three-position switching structure for a speaker includes a first PCBA board, a second PCBA board, and a switch conversion connector 3. The first PCBA board and the second PCBA board are electrically connected, and there is a gap between them. The second PCBA board is provided with a plurality of second power connector pins, which penetrate through holes in the first PCBA board. The gap between the first and second PCBA boards is 2-5mm to avoid electromagnetic coupling interference between the circuits of the two boards and to ensure the structural stability of the second power connector pins after they are inserted. An insulating sleeve is fitted on the outer part of the second power connector pins. The first PCBA board is provided with a foolproof positioning hole that matches the insulating sleeve. The cross-section of the foolproof positioning hole is a non-circular structure to prevent the power connector pins 4 from being assembled in reverse or misaligned. The power header pins and several first power header pins on the first PCBA board combine to form three independent power header pin 4 interfaces; the switch conversion conduction plug 3 can selectively connect to any one of the power header pin 4 interfaces to form three circuit paths with different resistance values; therefore, without increasing the width and volume of the PCBA board, the present invention splits the total circuit on two PCBA boards by stacking two PCBA boards, thereby reducing the traces in a single PCBA board and increasing the trace diameter of a single-layer PCBA board, thus meeting the high current operating requirements in actual scenarios; at the same time, the present invention can form three circuit paths with different resistance values ​​in a smaller width and volume, thereby covering the impedance requirements of more power amplifiers and improving equipment adaptability and application scenarios; Furthermore, by stacking two PCBA boards to distribute the total circuit, the width and volume of a single PCBA board can be reduced. According to experiments, the width of the PCBA board has the greatest impact on the structural layout of the miniature speaker in portable devices. Therefore, in this invention, not only is the width of the PCBA board reduced, but the wire diameter is also increased while achieving three-level resistance conversion, which meets the installation requirements and improves the adaptability and application scenarios of the device.

[0020] For circuits with three or more resistance values, this invention not only divides them into two PCBA boards, but also ensures the uniformity of the circuits on the two PCBA boards. Therefore, in one embodiment, the second power connector has 11 pins and the first power connector has 13 pins. The ends of the first and second power connectors are flush. The 13 first power connectors and the 11 second power connectors are arranged in a 4×6 array to form three independent power connector interfaces. This ensures the balance of the circuits between the two PCBA boards, further improves the service life of the PCBA boards, and prevents the circuits from being concentrated on one PCBA board, which could lead to current sensitivity issues. The switch conversion connector 3 includes a socket with a 2x4 array of pins; the socket has four spring contacts 6, each used to connect two sockets in the same column but different rows; the socket can selectively insert the first and second rows of the 4×6 array of power headers 4, or the third and fourth rows of power headers 4, or the fifth and sixth rows of power headers 4, to form three different resistance values ​​of circuit paths; this facilitates the differentiation of each resistance value circuit while greatly reducing the current fluctuations caused by further circuit integration, thus minimizing their impact. The speaker output performance is an issue; therefore, when the power header is inserted into the first or second row of power header pins 4, the two power header pins 4 in the four groups of the same column but different rows in the first and second rows will be connected to form a circuit with resistance. Similarly, when the power header is inserted into the third or fourth row of power header pins 4 or the fifth or sixth row of power header pins 4, the connection method of the resistors in the two PCBA boards will be changed, such as the change from series to parallel connection, thus forming three circuits with different resistance values, covering the impedance requirements of more power amplifiers, and improving equipment compatibility and application scenarios.

[0021] In one embodiment, the first PCBA board and the second PCBA board are electrically connected by eight conductive pins 5, and combined with the power header pins 4 inserted into the power header nut to achieve a circuit connection; specifically, with the first PCBA board viewed directly as the observation direction, in the 4×6 array of power header pins 4 interfaces, the power header pins 4 in the first row are connected in sequence as B1, B2, D1 and D2; the power header pins 4 in the second row are connected in sequence as A1, A2, C1 and C2. In the third row, the power header pins 4 are connected in sequence as B1, B2, D1, and D2; in the fourth row, the power header pins 4 are connected in sequence as A2, no impedance, C1, and C2. In the fifth row, the power header pins 4 are sequentially set to connection point B1, no impedance connection point, D1 connection point, and D2 connection point; in the sixth row, the power header pins 4 are sequentially set to connection point A2, no impedance connection point, C2 connection point, and no impedance connection point. The eight conductive pins 5 used to connect the first PCBA board and the second PCBA board are, in order: D1 connection point, C1 connection point, B1 connection point, A1 connection point, A2 connection point, B2 connection point, C2 connection point and D2 connection point; Among them, the connection points with the same name are connected, and the connection point B2 is connected to the connection point C1; A first resistive element is provided between connection points A1 and A2; a second resistive element is provided between connection points B1 and B2; a third resistive element is provided between connection points C1 and C2; and a fourth resistive element is provided between connection points D1 and D2. The 11 second power connector pins correspond to the B2 and D1 connection points in the first row; the A2 and C1 connection points in the second row; the B2 and D1 connection points in the third row; the A2, no-impedance connection point, and C1 connection point in the fourth row; the D1 connection point in the fifth row; and the A2 connection point in the sixth row. This splits the total circuit into two PCBA boards, thereby increasing the trace diameter on each board while achieving three levels of resistance conversion.

[0022] Therefore, when the power strip is plugged into the first and second rows of power strip pins 4 in the 4×6 array, the total resistance element formed by the parallel connection of the first and second resistance elements and the total resistance element formed by the parallel connection of the third and fourth resistance elements are connected in series in the circuit to form the first impedance circuit. When the power strip is plugged into the 3rd and 4th rows of the power strip pins in the 4×6 array, the total resistance element formed by the parallel connection of the third and fourth resistance elements, together with the first and second resistance elements, forms a second impedance circuit in the circuit. When the power strip is plugged into the 5th and 6th rows of the power strip pin 4 in the 4×6 array, the first resistor, the second resistor, the third resistor and the fourth resistor are connected in series in the circuit to form the third impedance circuit. This facilitates the switching between three different impedance circuits. In one embodiment, the first, second, third, and fourth resistive elements can all be fixed resistors with a resistance of 800mΩ. Therefore, the total resistances of the first, second, and third impedance circuits are 0.8Ω, 2Ω, and 3.2Ω, respectively.

[0023] Working principle: When switching between different resistance values, simply insert the power header pins 4 of rows 1 and 2, rows 3 and 4, or rows 5 and 6 of the 4×6 array to form three different resistance values. Therefore, without increasing the width and volume of the PCBA board, this invention splits the total circuit onto two PCBA boards through the stacking of two PCBA boards, thereby reducing the number of traces on a single PCBA board and increasing the trace diameter of a single-layer PCBA board, thus meeting the high current operating requirements in practical scenarios. At the same time, this invention can form three different resistance values, thereby covering the impedance requirements of more power amplifiers and improving equipment compatibility and application scenarios.

[0024] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "upper," "lower," "left," "right," "front," "back," and similar expressions used in this document are for illustrative purposes only.

[0025] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A three-position horn switch structure, characterized in that, The system includes a first PCBA board, a second PCBA board, and a switch conversion connector. The first PCBA board and the second PCBA board are electrically connected, and there is a gap between them. The second PCBA board is provided with a plurality of second power connectors, which pass through through holes in the first PCBA board. The plurality of second power connectors and a plurality of first power connectors on the first PCBA board are combined to form three independent power connector interfaces. The switch conversion connector can selectively be plugged into any one of the power connector interfaces to form three circuit paths with different resistance values. With the first PCBA board viewed directly as the observation direction, in the 4×6 array of power connectors, the power connectors in the first row are connected in sequence as B1, B2, D1, and D2; the power connectors in the second row are connected in sequence as A1, A2, C1, and C2. The power header pins in the third row are, in order, B1, B2, D1, and D2; the power header pins in the fourth row are, in order, A2, no-impedance, C1, and C2. The pin headers in the fifth row are sequentially set to connection points B1, no impedance, D1, and D2; the pin headers in the sixth row are sequentially set to connection points A2, no impedance, C2, and no impedance. The eight power connectors used to connect the first PCBA board and the second PCBA board are, in order: D1 connection point, C1 connection point, B1 connection point, A1 connection point, A2 connection point, B2 connection point, C2 connection point and D2 connection point; Among them, the connection points with the same name are connected, and the connection point B2 is connected to the connection point C1; A first resistive element is provided between connection points A1 and A2, a second resistive element is provided between connection points B1 and B2, a third resistive element is provided between connection points C1 and C2, and a fourth resistive element is provided between connection points D1 and D2.

2. The horn three-position selector switch structure according to claim 1, characterized in that, The second power connector has 11 pins, and the first power connector has 13 pins. The ends of the first power connector and the second power connector are flush. The 13 first power connectors and the 11 second power connectors are arranged in a 4×6 array to form three independent power connector interfaces.

3. The horn three-position selector switch structure according to claim 2, characterized in that, The switch conversion connector includes a socket with a 2x4 array of jacks; the socket has 4 springs, each of which is used to connect two jacks in the same column but different rows; the socket can be selectively inserted into the 1st and 2nd rows of the 4×6 array of power headers, or the 3rd and 4th rows of power headers, or the 5th and 6th rows of power headers, to form three circuit paths with different resistance values.

4. The horn three-position selector switch structure according to claim 3, characterized in that, The first PCBA board and the second PCBA board are electrically connected via eight power connector pins.

5. The horn three-position selector switch structure according to claim 3, characterized in that, When the power connector is plugged into the first and second rows of power connectors in the 4×6 array, the total resistance element formed by the parallel connection of the first and second resistance elements and the total resistance element formed by the parallel connection of the third and fourth resistance elements are connected in series in the circuit to form the first impedance circuit.

6. The horn three-position selector switch structure according to claim 3, characterized in that, When the power connector is plugged into the third and fourth rows of power connectors in the 4×6 array, the total resistance element formed by the parallel connection of the third and fourth resistance elements, together with the first and second resistance elements, forms a second impedance circuit in the circuit.

7. The horn three-position selector switch structure according to claim 3, characterized in that, When the power connector is plugged into the 5th and 6th rows of power connectors in the 4×6 array, the first resistor, the second resistor, the third resistor, and the fourth resistor are connected in series in the circuit to form a third impedance circuit.

8. The horn three-position selector switch structure according to claim 1, characterized in that, The 11 second power connector pins correspond to the B2 and D1 connection points in the first row; the A2 and C1 connection points in the second row; the B2 and D1 connection points in the third row; the A2 connection point, the impedance-free connection point, and the C1 connection point in the fourth row; the D1 connection point in the fifth row; and the A2 connection point in the sixth row.

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