Automatic identification earphone circuit
By designing an automatic identification headphone circuit, the combination of voltage divider circuit unit, transistor switch unit and headphone grounding switch chip is used to solve the noise problem of the headphone circuit when power is off, and noise cancellation and cost and volume optimization are achieved.
Patent Information
- Application Number
- CN202422210673.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-09
- Publication Date
- 2025-06-20
- Estimated Expiration
- 2034-09-09
AI Technical Summary
The existing headphone circuit has a high noise problem when power is off, and the traditional microcontroller control scheme and relay control scheme are costly and large in size, making it not suitable for mass production.
An automatic headphone identification circuit is designed, including a voltage divider circuit unit, a first transistor switch unit, a second transistor switch unit and a headphone grounding switch chip. Through the cooperation of these components, when the system power supply is powered off, a grounding loop is formed, and noise is absorbed away, thereby disappearing the noise.
It realizes the effect of eliminating noise when power is cut off, and has the advantages of simple control, low cost and small size, which is suitable for mass production.
Smart Images
Figure CN223007638U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of headphone noise reduction, and particularly relates to an automatic recognition headphone circuit. Background Art
[0002] With the rapid development of the communication industry, the popularity of audio-visual equipment terminals is getting higher and higher. Audio-visual equipment terminals play an important role in people's lives. As one of the important components of audio-visual equipment terminals, with the continuous development of the headphone industry, headphones have become an indispensable important device in the daily lives of more and more people. In the prior art, when powered off, there is a lot of noise in the circuit connected to the headphones. To solve the problem of large noise, in the X86 platform, a single-chip microcomputer control scheme and a relay control scheme are usually adopted, as follows:
[0003] 1. The single-chip microcomputer control scheme requires writing programs, with complex control and high costs, and is not suitable for batch production.
[0004] 2. The relay control scheme occupies a relatively large area, is not suitable for miniaturization, and has high costs and is not suitable for batch production.
[0005] Therefore, how to develop an automatic recognition headphone circuit that can reduce noise, has simple control, low costs, and small size has become an urgent problem to be solved. Summary of the Utility Model
[0006] The technical problem solved by the utility model is to provide an automatic recognition headphone circuit that can reduce noise, has simple control, low costs, and small size.
[0007] The utility model provides an automatic recognition headphone circuit, including a voltage dividing circuit unit, a first transistor switch unit, a second transistor switch unit, and a headphone ground pole switch chip. The voltage dividing circuit unit is electrically connected to the first transistor switch unit for driving the first transistor switch unit; the first transistor switch unit is electrically connected to the second transistor switch unit; the second transistor switch unit is electrically connected to the headphone ground pole switch chip, and the headphone ground pole switch chip is used for being electrically connected to the headphones.
[0008] Preferably, the voltage dividing circuit unit includes a first resistor, a second resistor, and a first capacitor. The first end of the first resistor is used for being electrically connected to a first power supply, and the second end of the first resistor is electrically connected to the first transistor switch unit; the first end of the second resistor is electrically connected to the second end of the first resistor, and the second end of the second resistor is grounded; the first end of the first capacitor is electrically connected to the second end of the first resistor, and the second end of the first capacitor is grounded.
[0009] Preferably, the first transistor switch unit includes a first field-effect transistor and a third resistor. The source of the first field-effect transistor is grounded. The drain of the first field-effect transistor is electrically connected to the second transistor switch unit. The gate of the first field-effect transistor is electrically connected to the second end of the first resistor. The first end of the third resistor is used to be electrically connected to a second power supply. The second end of the third resistor is electrically connected to the drain of the first field-effect transistor.
[0010] Preferably, the second transistor switch unit includes a second field-effect transistor, a second capacitor, and a fourth resistor. The source of the second field-effect transistor is grounded. The drain of the second field-effect transistor is electrically connected to the headphone ground pole switch chip. The gate of the second field-effect transistor is electrically connected to the drain of the first field-effect transistor. The first end of the second capacitor is electrically connected to the gate of the second field-effect transistor. The second end of the second capacitor is grounded. The first end of the fourth resistor is electrically connected to the drain of the second field-effect transistor. The second end of the fourth resistor is electrically connected to the source of the second field-effect transistor.
[0011] Preferably, the second transistor switch unit further includes a third field-effect transistor and a fifth resistor. The source of the third field-effect transistor is grounded. The drain of the third field-effect transistor is electrically connected to the headphone ground pole switch chip. The gate of the third field-effect transistor is electrically connected to the drain of the first field-effect transistor. The first end of the fifth resistor is electrically connected to the drain of the third field-effect transistor. The second end of the fifth resistor is electrically connected to the source of the third field-effect transistor.
[0012] Preferably, the automatic headphone recognition circuit further includes a sixth resistor. The first end of the sixth resistor is electrically connected to the first pin of the headphone ground pole switch chip. The second end of the sixth resistor is electrically connected to the sixth pin of the headphone ground pole switch chip. The first pin of the headphone ground pole switch chip is used to be electrically connected to a third power supply.
[0013] Preferably, the automatic headphone recognition circuit further includes a third capacitor. The first end of the third capacitor is electrically connected to the first pin of the headphone ground pole switch chip. The second end of the third capacitor is grounded.
[0014] Preferably, the automatic headphone recognition circuit further includes a seventh resistor. The first end of the seventh resistor is electrically connected to the third pin of the headphone ground pole switch chip. The second end of the seventh resistor is electrically connected to the fourth pin of the headphone ground pole switch chip. The third pin of the headphone ground pole switch chip is used to be electrically connected to the headphones.
[0015] Preferably, the automatic headphone recognition circuit further includes an eighth resistor. The third pin of the headphone ground pole switch chip is electrically connected to the headphones through the eighth resistor.
[0016] Preferably, the automatic recognition headphone circuit further includes a fourth capacitor, and the eighth resistor is electrically connected to the headphone through the fourth capacitor.
[0017] The utility model has the following beneficial effects: through the cooperation among the voltage division circuit unit, the first transistor switch unit, the second transistor switch unit and the headphone ground electrode switch chip, when the system power supply is cut off, there is no voltage in both the headphone ground electrode switch chip and the voltage division circuit unit, the headphone ground electrode switch chip cannot work, the voltage at the output end of the second transistor switch unit connected to the headphone ground electrode switch chip is also 0V, and a grounding loop is formed, so that the noise is absorbed by the ground and the noise disappears. This circuit has the advantages of simple control, low cost and small size. Description of the Drawings
[0018] Figure 1 is a circuit diagram of a partial circuit of the automatic recognition headphone circuit of the utility model.
[0019] Figure 2 is a circuit diagram of a partial circuit of the automatic recognition headphone circuit of the utility model. Detailed Embodiments
[0020] The utility model will be described in detail below with reference to the drawings and embodiments. It should be noted that if there is no conflict, the embodiments of the utility model and each feature in the embodiments can be combined with each other, and all are within the protection scope of the utility model.
[0021] Please refer to Figure 1 and Figure 2 , the utility model provides an automatic recognition headphone circuit, which includes a voltage division circuit unit 1, a first transistor switch unit 2, a second transistor switch unit 3 and a headphone ground electrode switch chip U. The voltage division circuit unit 1 is electrically connected to the first transistor switch unit 2 and is used to drive the first transistor switch unit 2. The first transistor switch unit 2 is electrically connected to the second transistor switch unit 3. The second transistor switch unit 3 is electrically connected to the headphone ground electrode switch chip U, and the headphone ground electrode switch chip U is used to be electrically connected to the headphone.
[0022] The voltage division circuit unit 1 includes a first resistor R1, a second resistor R2 and a first capacitor C1. The first end of the first resistor R1 is used to be electrically connected to a first power supply, wherein the voltage output by the first power supply is 5V. The second end of the first resistor R1 is electrically connected to the first transistor switch unit 2. The first end of the second resistor R2 is electrically connected to the second end of the first resistor R1, and the second end of the second resistor R2 is grounded. The first end of the first capacitor C1 is electrically connected to the second end of the first resistor R1, and the second end of the first capacitor C1 is grounded. Filtering is carried out through the second capacitor C2. Therefore, a stable voltage can be provided for the first transistor switch unit 2 to avoid mis-triggering.
[0023] The first transistor switch unit 2 includes a first field effect transistor Q1 and a third resistor R3. The source of the first field effect transistor Q1 is grounded. The drain of the first field effect transistor Q1 is electrically connected to the second transistor switch unit 3. The gate of the first field effect transistor Q1 is electrically connected to the second end of the first resistor R1. The first end of the third resistor R3 is used to be electrically connected to a second power supply. The second end of the third resistor R3 is electrically connected to the drain of the first field effect transistor Q1. Among them, the voltage output from the second power supply to the third resistor R3 is 3V.
[0024] The second transistor switch unit 3 includes a second field effect transistor Q2, a second capacitor C2 and a fourth resistor R4. The source of the second field effect transistor Q2 is grounded. The drain of the second field effect transistor Q2 is electrically connected to the headphone ground pole switch chip U. The gate of the second field effect transistor Q2 is electrically connected to the drain of the first field effect transistor Q1. The first end of the second capacitor C2 is electrically connected to the gate of the second field effect transistor Q2. The second end of the second capacitor C2 is grounded. The first end of the fourth resistor R4 is electrically connected to the drain of the second field effect transistor Q2. The second end of the fourth resistor R4 is electrically connected to the source of the second field effect transistor Q2.
[0025] The second transistor switch unit 3 further includes a third field effect transistor Q3 and a fifth resistor R5. The source of the third field effect transistor Q3 is grounded. The drain of the third field effect transistor Q3 is electrically connected to the headphone ground pole switch chip U. The gate of the third field effect transistor Q3 is electrically connected to the drain of the first field effect transistor Q1. The first end of the fifth resistor R5 is electrically connected to the drain of the third field effect transistor Q3. The second end of the fifth resistor R5 is electrically connected to the source of the third field effect transistor Q3.
[0026] The automatic identification headphone circuit of this embodiment further includes a sixth resistor R6 and a third capacitor C3. The first end of the sixth resistor R6 is electrically connected to the first pin of the headphone ground pole switch chip U. The second end of the sixth resistor R6 is electrically connected to the sixth pin of the headphone ground pole switch chip U. The first pin of the headphone ground pole switch chip U is used to be electrically connected to a third power supply. The first end of the third capacitor C3 is electrically connected to the first pin of the headphone ground pole switch chip U. The second end of the third capacitor C3 is grounded. In this embodiment, the headphone ground pole switch chip U is a headphone ground pole switch chip with the model SGM2549YN6G / TR produced by SGMICRO.
[0027] The automatic identification headphone circuit of this embodiment further includes a seventh resistor R7. The first end of the seventh resistor R7 is electrically connected to the third pin of the headphone ground pole switch chip U. The second end of the seventh resistor R7 is electrically connected to the fourth pin of the headphone ground pole switch chip U. The third pin of the headphone ground pole switch chip U is used to be electrically connected to the earphone.
[0028] The automatic recognition headphone circuit of this embodiment further includes an eighth resistor R8. The third pin of the headphone ground electrode switch chip U is electrically connected to the headphone through the eighth resistor R8. Preferably, the automatic recognition headphone circuit of this embodiment further includes a fourth capacitor C4, a fifth capacitor C5, a ninth resistor R9, and a tenth resistor R10. The eighth resistor R8 is electrically connected to the headphone through the fourth capacitor C4 and the fifth capacitor C5, and is electrically connected to the control chip through the ninth resistor R9 and the tenth resistor R10.
[0029] The specific implementation process of the noise reduction of this utility model is as follows: When the power is off, the voltage at the first end of the first resistor R1 is 0V, the voltage at the first pin of the headphone ground electrode switch chip U, which serves as the receiving power supply, is 0V. The circuits of the fourth and sixth pins of the headphone ground electrode switch chip U are disconnected from the fifth pin. At this time, the voltages at the first resistor R1 and the second resistor R2 are 0V, the gate voltages of the second field-effect transistor Q2 and the third field-effect transistor Q3 are 0V, and the drain voltages of the second field-effect transistor Q2 and the third field-effect transistor Q3 are 0V, forming a ground loop, and the noise is absorbed by the ground, so the noise disappears.
[0030] In summary, through the cooperation between the voltage division circuit unit 1, the first transistor switch unit 2, the second transistor switch unit 3, and the headphone ground electrode switch chip U of this utility model, when the system power is off, neither the headphone ground electrode switch chip U nor the voltage division circuit unit 1 has voltage, the headphone ground electrode switch chip U cannot work, and the voltage at the output end of the second transistor switch unit 3 connected to the headphone ground electrode switch chip U is also 0V, forming a ground loop, and the noise is absorbed by the ground, so the noise disappears. This circuit has the advantages of simple control, low cost, and small volume.
[0031] The automatic recognition headphone circuit provided by this utility model has been introduced in detail above. Specific examples are used in this article to elaborate on the principle and implementation manner of this utility model. The description of the above embodiments is only used to help understand the method and its core idea of this utility model. At the same time, for those of ordinary skill in the art, according to the idea of this utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification is only the implementation manner of this utility model, and does not limit the patent scope of this utility model. Any equivalent structure or equivalent process transformation made by using the content of this utility model's specification and drawings, or directly or indirectly applied to other related technical fields, shall be equally included in the patent protection scope of this utility model and should not be construed as a limitation to this utility model.
Claims
1. An automatic headphone recognition circuit, characterized in that: It includes a voltage divider circuit unit, a first transistor switch unit, a second transistor switch unit and an earphone grounding switch chip. The voltage divider circuit unit is electrically connected to the first transistor switch unit and is used to drive the first transistor switch unit; the first transistor switch unit is electrically connected to the second transistor switch unit; the second transistor switch unit is electrically connected to the earphone grounding switch chip, and the earphone grounding switch chip is used to be electrically connected to the earphone.
2. The automatic headphone recognition circuit according to claim 1, characterized in that: The voltage divider circuit unit includes a first resistor, a second resistor and a first capacitor, wherein the first end of the first resistor is used to be electrically connected to a first power supply, and the second end of the first resistor is electrically connected to the first transistor switch unit; the first end of the second resistor is electrically connected to the second end of the first resistor, and the second end of the second resistor is grounded; the first end of the first capacitor is electrically connected to the second end of the first resistor, and the second end of the first capacitor is grounded.
3. The automatic headphone recognition circuit according to claim 2, characterized in that: The first transistor switch unit includes a first field effect transistor and a third resistor, the source of the first field effect transistor is grounded, the drain of the first field effect transistor is electrically connected to the second transistor switch unit, and the gate of the first field effect transistor is electrically connected to the second end of the first resistor; the first end of the third resistor is used to be electrically connected to a second power supply, and the second end of the third resistor is electrically connected to the drain of the first field effect transistor.
4. The automatic headphone recognition circuit according to claim 3, characterized in that: The second transistor switch unit includes a second field effect tube, a second capacitor and a fourth resistor, the source of the second field effect tube is grounded, the drain of the second field effect tube is electrically connected to the headphone grounding switch chip, and the gate of the second field effect tube is electrically connected to the drain of the first field effect tube; the first end of the second capacitor is electrically connected to the gate of the second field effect tube, and the second end of the second capacitor is grounded; the first end of the fourth resistor is electrically connected to the drain of the second field effect tube, and the second end of the fourth resistor is electrically connected to the source of the second field effect tube.
5. The automatic headphone recognition circuit according to claim 3, characterized in that: The second transistor switch unit also includes a third field effect transistor and a fifth resistor, the source of the third field effect transistor is grounded, the drain of the third field effect transistor is electrically connected to the headphone grounding switch chip, and the gate of the third field effect transistor is electrically connected to the drain of the first field effect transistor; the first end of the fifth resistor is electrically connected to the drain of the third field effect transistor, and the second end of the fifth resistor is electrically connected to the source of the third field effect transistor.
6. The automatic headphone recognition circuit according to claim 5, characterized in that: The automatic headphone identification circuit also includes a sixth resistor, a first end of the sixth resistor is electrically connected to the first pin of the headphone grounding electrode switch chip, a second end of the sixth resistor is electrically connected to the sixth pin of the headphone grounding electrode switch chip, and the first pin of the headphone grounding electrode switch chip is used to be electrically connected to a third power supply.
7. The automatic headphone recognition circuit according to claim 5, characterized in that: The automatic headphone identification circuit also includes a third capacitor, a first end of the third capacitor is electrically connected to the first pin of the headphone grounding electrode switch chip, and a second end of the third capacitor is grounded.
8. The automatic headphone recognition circuit according to claim 5, characterized in that: The automatic headphone identification circuit also includes a seventh resistor, a first end of the seventh resistor is electrically connected to the third pin of the headphone grounding electrode switch chip, a second end of the seventh resistor is electrically connected to the fourth pin of the headphone grounding electrode switch chip, and the third pin of the headphone grounding electrode switch chip is used to be electrically connected to the headphone.
9. The automatic headphone recognition circuit according to claim 8, characterized in that: The automatic earphone identification circuit further includes an eighth resistor, and the third pin of the earphone grounding electrode switch chip is electrically connected to the earphone through the eighth resistor.
10. The automatic headphone recognition circuit according to claim 9, characterized in that: The automatic earphone identification circuit further includes a fourth capacitor, and the eighth resistor is electrically connected to the earphone via the fourth capacitor.