In-ear hearing aid communication circuit and hearing aid

Abstract

The embodiment of the utility model relates to the technical field of hearing aids, in particular to an in-ear hearing aid communication circuit and a hearing aid. And the main control circuit is used for communicating with the earphone through the signal conversion module according to the level signal or the wireless signal. Through the circuit, the mechanical key module or the wireless module can be integrated in the charging bin, and the charging bin and the earphone are in communication connection through the signal conversion module, so that the lightweight and miniaturized design of the earphone is realized, and the wearing experience of the hearing aid is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of hearing aid technology, specifically to an in-ear hearing aid communication circuit and a hearing aid. Background Technology

[0002] A hearing aid is a small amplifier that amplifies sounds that are otherwise inaudible, allowing the residual hearing of the hearing-impaired person to transmit the sound to the auditory center of the brain, thus enabling them to perceive the sound. This brings great convenience to the hearing-impaired. Hearing aids generally consist of an earpiece and a charging case. To facilitate long-term wear, more and more hearing aids are being made smaller; however, the mechanical buttons or internal wireless modules limit the size of the hearing aid, resulting in a less than ideal wearing experience with current models. Utility Model Content

[0003] In view of the above problems, this utility model provides an in-ear hearing aid communication circuit and hearing aid, which solves the problem that the mechanical buttons or internal wireless modules of existing hearing aids limit the size of the hearing aid, resulting in a poor wearing experience.

[0004] In a first aspect, this utility model provides a communication circuit for an in-ear hearing aid, applied in the charging case of the hearing aid, the circuit comprising:

[0005] The interface module is equipped with at least positive contacts, negative contacts, and communication contacts for electrically connecting the charging case and the earphones.

[0006] An insertion detection module is connected to the negative contact to acquire the detection signal generated by the connection between the earphone and the interface circuit.

[0007] A signal conversion module, connected to the communication contact, is used to convert the communication signal used for communication between the charging case and the earphones into high and low levels before transmission;

[0008] The signal input module is used to acquire external input level signals or wireless signals;

[0009] The system also includes a main control module, which is connected to the interface module, insertion detection module, signal conversion module, and signal input module. The main control circuit is used to communicate with the earphones through the signal conversion module based on the level signal or wireless signal.

[0010] In some optional embodiments, the main control module is provided with an insertion detection end, a first communication end and a second communication end, the insertion detection end is connected to the insertion detection module, and the first communication end and the second communication end are connected to the signal conversion module.

[0011] In some optional embodiments, the signal conversion module includes a signal connection chip and a signal follower chip.

[0012] The signal connection chip is provided with a first connection terminal and a second connection terminal. The first connection terminal is connected to the communication contact, and the second connection terminal is connected to the first communication terminal.

[0013] The signal follower chip is provided with a third connection terminal and a fourth connection terminal. The third connection terminal is connected to the first communication terminal, and the fourth connection terminal is connected to the second communication terminal.

[0014] In some alternative embodiments, the insertion detection circuit includes a first switching circuit and a second switching circuit.

[0015] The enable terminal of the first switching circuit is connected to the CH1_SW terminal of the main control chip, and the first switching circuit is used to control the connection of the negative contact to the CH1_ADC terminal of the main control chip.

[0016] The enable terminal of the second switching circuit is connected to the power supply contact, and the second switching circuit is used to control the level change of the insertion detection terminal according to the signal of the negative contact.

[0017] In some alternative embodiments, the first switching circuit includes a MOSFET Q1, resistors R1, R2, R3, R4, and capacitor C1.

[0018] In this configuration, the gate of the MOS transistor Q1 is connected to resistors R1 and R2, the source is connected to resistors R3 and R4, and the drain is connected to the negative contact and the second switching circuit. The other end of resistor R2 is connected to the CH1_SW terminal of the main control chip, the other end of resistor R4 is connected to the CH1_ADC terminal of the main control chip and capacitor C1, and the other ends of resistors R1, R3 and C1 are grounded.

[0019] In some alternative embodiments, the second switching circuit includes a MOSFET Q2, resistors R5, R6, and R7;

[0020] The gate of the MOS transistor Q2 is connected to resistors R5 and R6, the drain is connected to the insertion detection terminal and resistor R7, and the source is grounded; the other end of resistor R5 is connected to the negative contact and the first switching circuit, the other end of resistor R7 is connected to the first power supply, and the other end of resistor R6 is grounded.

[0021] In some alternative embodiments, the positive contact is connected to a second power supply via a fuse F1, the negative contact is also connected to the power ground via a capacitor, the positive contact, the negative contact and the communication contact are respectively connected to an electrostatic tube, and the other end of the electrostatic tube is grounded.

[0022] In some optional embodiments, a power detection circuit is also included, which includes MOSFETs Q3 and Q4, resistors R9, R10, R11, R12, and R13, and capacitor C3.

[0023] The gate of the MOS transistor Q3 is connected to resistors R9 and R10, the drain is connected to resistor R12 and the gate of the MOS transistor Q4 through resistor R11, and the source is grounded.

[0024] The source of the MOSFET Q4 is connected to the battery power supply, and the drain is connected to resistor R14, capacitor C3 and the power detection terminal of the main control module through resistor R13.

[0025] The other end of resistor R9 is connected to the NTC_VCC terminal of the main control module, the other end of resistor R12 is connected to the battery power supply, and the other ends of resistor R10, resistor Q14 and capacitor C3 are grounded.

[0026] In some optional embodiments, a signal input module is also included, which includes a switch S1, an electrostatic discharge tube D1, a capacitor C2, and a resistor R8.

[0027] The first end of the switch S1 is connected to the electrostatic tube D1, capacitor C2, resistor R8 and the signal input terminal of the main control module. The second end of the switch S1 is connected to the other end of the electrostatic tube D1 and the power ground. The other end of the resistor R8 is connected to the first power supply, and the other end of the capacitor C2 is grounded.

[0028] Secondly, this utility model provides a hearing aid, comprising:

[0029] A pair of headphones;

[0030] A charging case, wherein the charging case has a receiving space for accommodating the earphones, and the earphone plug is disposed in the receiving space;

[0031] The charging case is also equipped with the aforementioned in-ear hearing aid communication circuit, and the charging case is electrically connected to the earphones through the in-ear hearing aid communication circuit.

[0032] Compared to existing technologies, the advantages of this invention are as follows: The communication circuit for this in-ear hearing aid comprises an interface module, an insertion detection module, a signal conversion module, and a main control module. The interface module electrically connects the charging case and the earphone; the insertion detection module acquires the detection signal generated by the connection between the earphone and the interface circuit; the signal conversion module converts the communication signal used for communication between the charging case and the earphone into high and low levels before transmission; the signal input module acquires external input level signals or wireless signals; and the main control module is connected to the interface module, insertion detection module, signal conversion module, and signal input module. The main control circuit communicates with the earphone through the signal conversion module based on the level signal or wireless signal. This circuit allows for the integration of a mechanical button module or a wireless module into the charging case, and the communication connection between the charging case and the earphone is established through the signal conversion module, thereby achieving a lightweight and miniaturized design for the earphone and significantly improving the wearing experience of the hearing aid.

[0033] The above description is merely an overview of the technical solutions of the present utility model embodiments. In order to better understand the technical means of the present utility model embodiments and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the present utility model embodiments more obvious and understandable, specific embodiments of the present utility model are described below. Attached Figure Description

[0034] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0035] Figure 1 This invention provides a schematic diagram of the communication switching circuit according to Embodiment 1.

[0036] Figure 2 The circuit diagram of the main control circuit provided in Embodiment 2 of this utility model is shown;

[0037] Figure 3 The circuit diagram of the signal connection chip provided in Embodiment 2 of this utility model is shown;

[0038] Figure 4 The circuit schematic of the signal follower chip provided in Embodiment 2 of this utility model is shown;

[0039] Figure 5 The circuit diagram of the insertion detection module according to Embodiment 2 of this utility model is shown;

[0040] Figure 6 The circuit diagram of the interface circuit provided in Embodiment 2 of this utility model is shown.

[0041] Figure 7 The circuit diagram of the circuit detection circuit provided in Embodiment 2 of this utility model is shown.

[0042] Figure 8 The circuit diagram of the signal input module provided in Embodiment 2 of this utility model is shown.

[0043] Figure label:

[0044] 110. Main control module; 120. Interface module; 130. Insertion detection module; 140. Signal conversion module; 150. Signal input module;

[0045] MCU, main control chip; U1, signal connection chip; U2, signal follower chip; P1-, negative contact; L_SDA, communication contact; VOUT_5V, positive contact; VCC, first power supply; CH1_IN_CHK, detection terminal; SDA, first communication terminal; DSP_R, second communication terminal; VBAT+, battery power; LI_ADC, power detection terminal; KEY1, signal input terminal. Detailed Implementation

[0046] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein.

[0047] Example 1:

[0048] Figure 1 This invention illustrates a communication circuit for an in-ear hearing aid, applied in the charging case of the hearing aid. This circuit, integrated within the charging case, allows for the placement of mechanical buttons or wireless modules, originally designed into the earphone, within the charging case, thereby reducing the earphone's size. The circuit includes an interface module 120, an insertion detection module 130, a signal conversion module 140, a signal input module 150, and a main control module 110.

[0049] The interface module 120 is equipped with at least a positive contact VOUT_5V, a negative contact, and a communication contact L_SDA for electrically connecting the charging case and the earphones. The interface module 120 is a communication circuit connection interface for in-ear hearing aids. Specifically, the positive contact VOUT_5V and the negative contact are used to power the earphones, and the communication contact L_SDA is used for communication connection with the earphones.

[0050] The insertion detection module 130 is connected to the negative contact and is used to acquire the detection signal generated by the connection between the earphone and the interface circuit. The insertion detection module 130 is used to detect whether the earphone is placed in the charging case. When the earphone is placed in the charging case, the contacts on the earphone are connected to the positive contact VOUT_5V, the negative contact, and the communication contact L_SDA of the interface module 120. After the insertion detection module 130 detects the detection signal, the charging case and the earphone immediately establish a handshake connection.

[0051] The signal conversion module 140 is connected to the communication contact L_SDA and is used to convert the communication signal used for communication between the charging case and the earphones into high and low levels before transmission; the signal conversion module 140 is used to convert the signal of the charging case or the earphones into high and low levels, thereby realizing the communication signal interoperability between the charging case and the earphones.

[0052] The signal input module is used to acquire external input level signals or wireless signals. External inputs can be level signals from pressing the mechanical button on the charging case or wireless signals from communication terminals such as mobile phones via Bluetooth or WiFi, and the earphones can be controlled based on the level signals or wireless signals.

[0053] The main control module 110 is connected to the interface module 120, insertion detection module 130, signal conversion module 140, and signal input module 150. The main control circuit communicates with the earphones via the signal conversion module 140 based on either a level signal or a wireless signal. The main control module 110 may be a main control chip and its peripheral circuitry, used to connect to the interface module 120, insertion detection module 130, signal conversion module 140, and signal input module, thereby controlling the entire charging case circuit.

[0054] This invention discloses a communication circuit for an in-ear hearing aid. It comprises an interface module 120, an insertion detection module 130, a signal conversion module 140, and a main control module 110. The interface module 120 electrically connects the charging case and the earphone. The insertion detection module 130 acquires the detection signal generated by the connection between the earphone and the interface circuit. The signal conversion module 140 converts the communication signal used for communication between the charging case and the earphone into high and low levels before transmission. The signal input module acquires externally input level signals or wireless signals. The main control module 110 is connected to the interface module 120, insertion detection module 130, signal conversion module 140, and signal input module. The main control circuit communicates with the earphone through the signal conversion module 140 based on the level signal or wireless signal. This circuit allows for the integration of a mechanical button module or wireless module into the charging case, and the communication connection between the charging case and the earphone via the signal conversion module 140, thereby achieving a lightweight and miniaturized design of the earphone and significantly improving the wearing experience of the hearing aid.

[0055] Example 2:

[0056] Figures 2-8 This invention illustrates a second embodiment of a communication circuit for an in-ear hearing aid, applied in the charging case of the hearing aid. The circuit includes an interface module 120, an insertion detection module 130, a signal conversion module 140, a signal input module, and a main control module 110. This embodiment further describes the interface module 120, the insertion detection module 130, the signal conversion module 140, the signal input module, and the main control module 110.

[0057] In some alternative embodiments, see Figure 2 The main control module 110 is equipped with an insertion detection terminal CH1_IN_CHK, a first communication terminal SDA, and a second communication terminal DSP_R. The insertion detection terminal CH1_IN_CHK is connected to the insertion detection module 130, and the first communication terminal SDA and the second communication terminal DSP_R are connected to the signal conversion module 140. In this embodiment, the main control chip can be a control chip of model U_N32L406CBL7_LQFP48, and peripheral circuits for maintaining the normal operation of the main control chip are provided around the main control chip. The main control chip is used to receive detection signals and communicate with the earphone based on the detection signals. In addition, the main control chip also communicates with the earphone through the signal conversion module 140 based on level signals or wireless signals.

[0058] In some alternative embodiments, see Figures 3-4 The signal conversion module 140 includes a signal connection chip and a signal follower chip. The signal connection chip is provided with a first connection terminal U1_5 and a second connection terminal U1_3. The first connection terminal U1_5 is connected to the communication contact L_SDA, and the second connection terminal U1_3 is connected to the first communication terminal SDA. The signal follower chip is provided with a third connection terminal U1_4 and a fourth connection terminal U1_1. The third connection terminal U1_4 is connected to the first communication terminal SDA, and the fourth connection terminal U1_1 is connected to the second communication terminal DSP_R.

[0059] In this embodiment, the signal connection chip is used to directly connect the charging case and the earphones, and to connect to the communication contact L_SDA through a first connection, and to connect the second connection terminal to the first communication terminal SDA to achieve signal interconnection. The signal conversion module 140 can convert the high and low levels between the charging case and the earphones, and the converted signal follows the transmission signal of the signal connection chip and is sent to the main control module 110 for identification. The signal follower chip can be any one of the following chips: TXS0102, TXS0104, PCA9517, PCA9617, PCA9306, and NTS0104. The signal connection chip can be a connector or other voltage regulator chip.

[0060] In some alternative embodiments, see Figure 5 The insertion detection circuit includes a first switching circuit and a second switching circuit. The enable terminal of the first switching circuit is connected to the CH1_SW terminal of the main control chip, and the first switching circuit is used to control the connection of the negative contact to the CH1_ADC terminal of the main control chip. The enable terminal of the second switching circuit is connected to the power supply contact, and the second switching circuit is used to control the level change of the insertion detection terminal CH1_IN_CHK according to the signal of the negative contact. In this embodiment, the first switching circuit can be an auxiliary detection circuit used to assist in acquiring the signal of the first contact P1-, and output it to the main control chip for processing through the CH1_ADC terminal. In addition, the first switching circuit can be normally turned on when the charging compartment is powered on or has power, so that the electrical signal of the first contact P1- can be accurately sent to the insertion detection terminal CH1_IN_CHK of the main control chip for detection. The enable terminal of the second switching circuit is connected to the first contact P1-, and the first switching circuit is used to control the level change of the insertion detection terminal CH1_IN_CHK according to the signal of the first contact P1-. The second switching circuit can serve as the main detection circuit. It can change the voltage of the detection terminal CH1_IN_CHK based on the electrical signal of the negative contact P1-, thereby enabling the main control circuit to recognize that the headphones are plugged in.

[0061] In some optional embodiments, the first switching circuit includes a MOSFET Q1, resistors R1, R2, R3, and R4, and a capacitor C1. The gate of MOSFET Q1 is connected to resistors R1 and R2, the source is connected to resistors R3 and R4, and the drain is connected to the negative contact and the second switching circuit. The other end of resistor R2 is connected to the CH1_SW terminal of the main control chip, and the other end of resistor R4 is connected to the CH1_ADC terminal of the main control chip and capacitor C1. The other ends of resistors R1, R3, and C1 are grounded. In this embodiment, MOSFET Q1 can be turned on by default under the control of the main control chip, allowing the CH1_ADC terminal to recognize the negative contact P1- signal. Resistors R1, R2, R3, and R4 are used for voltage division protection, and capacitor C1 is used for filtering to ensure the normal operation of the first switching circuit.

[0062] In some optional embodiments, the second switching circuit includes a MOSFET Q2, resistors R5, R6, and R7. The gate of MOSFET Q2 is connected to resistors R5 and R6, the drain is connected to the insertion detection terminal CH1_IN_CHK and resistor R7, and the source is grounded. The other end of resistor R5 is connected to the negative contact and the first switching circuit, the other end of resistor R7 is connected to the first power supply VCC, and the other end of resistor R6 is grounded. When the earphone is connected to the interface circuit, the level of the negative contact P1- is high, causing MOSFET Q2 to conduct, thereby pulling the signal at the insertion detection terminal CH1_IN_CHK low, allowing the main control signal to recognize that the earphone is connected. Resistors R5, R6, and R7 are used for voltage divider protection to ensure the normal operation of the second switching circuit.

[0063] In some alternative embodiments, see Figure 6 The positive contact VOUT_5V is connected to the second power supply via fuse F1, and the negative contact is also connected to the power ground via a capacitor. The positive contact VOUT_5V, the negative contact, and the communication contact L_SDA are each connected to an electrostatic discharge tube, the other end of which is grounded. In this embodiment, the capacitor and electrostatic discharge tube are used to stabilize the connection signal between the charging case and the earphones, thus protecting the circuit.

[0064] In some alternative embodiments, see Figure 7 It also includes a power detection circuit, which includes MOSFETs Q3 and Q4, resistors R9, R10, R11, R12, R13, and capacitor C3. The gate of MOSFET Q3 is connected to resistors R9 and R10, the drain is connected to resistor R11, resistor R12, and the gate of MOSFET Q4, and the source is grounded. The source of MOSFET Q4 is connected to the battery power supply VBAT+, and the drain is connected to resistor R13, resistor R14, capacitor C3, and the power detection terminal LI_ADCCH1_IN_CHK of the main control module 110. The other end of resistor R9 is connected to the NTC_VCC terminal of the main control module 110, the other end of resistor R12 is connected to the battery power supply VBAT+, and the other ends of resistors R10, Q14, and capacitor C3 are grounded. In this embodiment, MOSFET Q3 can remain on under the control of the main control module 110, thereby keeping MOSFET Q4 continuously on. The battery power VBAT+ is then monitored in real time via the power detection terminal LI_ADCCH1_IN_CHK of the main control module 110. Resistors R9, R10, R11, R12, R13, and capacitor C3 are used in the voltage divider filter protection circuit.

[0065] In some alternative embodiments, see Figure 8The system also includes a signal input module, which comprises a switch S1, an electrostatic transistor D1, a capacitor C2, and a resistor R8. The first terminal of switch S1 is connected to the electrostatic transistor D1, capacitor C2, resistor R8, and the signal input terminal KEY1 of the main control module 110. The second terminal of switch S1 is connected to the other terminal of electrostatic transistor D1 and the power ground. The other terminal of resistor R8 is connected to the first power supply VCC, and the other terminal of capacitor C2 is grounded. In this embodiment, the signal input module can be a mechanical input circuit or a wireless input circuit. In this example, the signal input module is a mechanical input circuit, and pressing switch S1 pulls the signal input terminal KEY1 low, thereby inputting an adjustment signal to the main control module 110.

[0066] In some alternative embodiments, the charging case is paired with two earbuds. Two insertion detection modules 130 are provided, one for connecting the charging case to each earbud, and the circuitry connecting the two earbuds is identical and functional. The charging case can be simultaneously connected to both earbuds for communication or charging.

[0067] Example 3

[0068] Figure 1 This invention illustrates a second embodiment of a hearing aid, comprising a pair of earphones and a charging case. The charging case has a space for accommodating the earphones, and the earphone plug is disposed within this space. The charging case also includes an in-ear hearing aid communication circuit as described in Embodiment 1 or Embodiment 2, and the charging case is electrically connected to the earphones via this communication circuit. In this embodiment, a PCB circuit board is disposed within the charging case, and the communication switching circuit of Embodiment 1 or Embodiment 2 is integrated onto the PCB circuit board. This circuit allows for the integration of a mechanical button module or a wireless module into the charging case, and a signal conversion module 140 enables communication between the charging case and the earphones, thereby achieving a lightweight and miniaturized design of the earphones and significantly improving the wearing experience of the hearing aid.

[0069] The algorithms or displays provided herein are not inherently related to any particular computer, virtual system, or other device. Furthermore, the embodiments of this invention are not directed to any particular programming language.

[0070] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the present invention may be practiced without these specific details. Similarly, for the sake of brevity and to aid in understanding one or more aspects of the invention, in the above description of exemplary embodiments of the invention, various features of the embodiments of the invention are sometimes grouped together in a single embodiment, figure, or description thereof. The claims, which follow the detailed description, are hereby expressly incorporated into that detailed description, wherein each claim itself constitutes a separate embodiment of the invention.

[0071] Those skilled in the art will understand that the modules in the device of the embodiment can be adaptively changed and placed in one or more devices different from that embodiment. Modules, units, or components in the embodiment can be combined into a single module, unit, or component, and further, they can be divided into multiple sub-modules, sub-units, or sub-components, except that at least some of such features and / or processes or units are mutually exclusive.

[0072] It should be noted that the above embodiments are illustrative of the present invention and not restrictive of it, and those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In the unit claims listing several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names. The steps in the above embodiments, unless otherwise specified, should not be construed as limiting the order of execution.

Claims

1. An in-ear hearing aid communication circuit, characterized by The circuitry, used in the charging case of a hearing aid, includes: The interface module is equipped with at least positive contacts, negative contacts, and communication contacts for electrically connecting the charging case and the earphones. An insertion detection module is connected to the negative contact to acquire the detection signal generated by the connection between the earphone and the interface circuit. A signal conversion module, connected to the communication contact, is used to convert the communication signal used for communication between the charging case and the earphones into high and low levels before transmission; The signal input module is used to acquire external input level signals or wireless signals; The system also includes a main control module, which is connected to the interface module, insertion detection module, signal conversion module, and signal input module. The main control module is used to communicate with the earphone through the signal conversion module based on the level signal or wireless signal.

2. The in-ear hearing aid communication circuit of claim 1, wherein, The main control module is equipped with an insertion detection end, a first communication end, and a second communication end. The insertion detection end is connected to the insertion detection module, and the first and second communication ends are connected to the signal conversion module.

3. The in-ear hearing aid communication circuit of claim 2, wherein, The signal conversion module includes a signal connection chip and a signal follower chip. The signal connection chip is provided with a first connection terminal and a second connection terminal. The first connection terminal is connected to the communication contact, and the second connection terminal is connected to the first communication terminal. The signal follower chip is provided with a third connection terminal and a fourth connection terminal. The third connection terminal is connected to the first communication terminal, and the fourth connection terminal is connected to the second communication terminal.

4. The in-ear hearing aid communication circuit of claim 2, wherein, The insertion detection module includes a first switching circuit and a second switching circuit. The enable terminal of the first switching circuit is connected to the CH1_SW terminal of the main control chip, and the first switching circuit is used to control the connection of the negative contact to the CH1_ADC terminal of the main control chip. The enable terminal of the second switching circuit is connected to the power supply contact, and the second switching circuit is used to control the level change of the insertion detection terminal according to the signal of the negative contact.

5. The in-ear hearing aid communication circuit of claim 4, wherein, The first switching circuit includes a MOSFET Q1, resistors R1, R2, R3, R4, and capacitor C1. In this configuration, the gate of the MOS transistor Q1 is connected to resistors R1 and R2, the source is connected to resistors R3 and R4, and the drain is connected to the negative contact and the second switching circuit. The other end of resistor R2 is connected to the CH1_SW terminal of the main control chip, the other end of resistor R4 is connected to the CH1_ADC terminal of the main control chip and capacitor C1, and the other ends of resistors R1, R3 and C1 are grounded.

6. The in-ear hearing aid communication circuit of claim 5, wherein, The second switching circuit includes a MOSFET Q2, resistors R5, R6, and R7; The gate of the MOS transistor Q2 is connected to resistors R5 and R6, the drain is connected to the insertion detection terminal and resistor R7, and the source is grounded; the other end of resistor R5 is connected to the negative contact and the first switching circuit, the other end of resistor R7 is connected to the first power supply, and the other end of resistor R6 is grounded.

7. The in-ear hearing aid communication circuit of claim 1, wherein, The positive contact is connected to the second power supply through fuse F1, and the negative contact is also connected to the power ground through a capacitor. The positive contact, negative contact, and communication contact are respectively connected to the electrostatic tube, and the other end of the electrostatic tube is grounded.

8. The in-ear hearing aid communication circuit of claim 1, wherein, Further comprising an electric quantity detection circuit, the electric quantity detection circuit comprises MOS tube Q3, MOS tube Q4, resistance R9, resistance R10, resistance R11, resistance R12, resistance R13 and capacitor C3, The gate of the MOS tube Q3 is connected with the resistance R9 and the resistance R10, the drain is connected with the resistance R12 and the gate of the MOS tube Q4 through the resistance R11, and the source is grounded. The source of the MOS tube Q4 is connected with the battery power supply, the drain is connected with the resistance R14, the capacitor C3 and the electric quantity detection end of the main control module through the resistance R13. The other end of the resistance R9 is connected with the NTC_VCC end of the main control module, the other end of the resistance R12 is connected with the battery power supply, and the other ends of the resistance R10, the resistance Q14 and the capacitor C3 are grounded.

9. The in-ear hearing aid communication circuit of claim 1, wherein, The signal input module comprises a switch S1, a static tube D1, a capacitor C2 and a resistance R8, The first end of the switch S1 is connected with the static tube D1, the capacitor C2, the resistance R8 and the signal input end of the main control module, the second end of the switch S1 is connected with the other end of the static tube D1 and the power supply ground, the other end of the resistance R8 is connected with the first power supply, and the other end of the capacitor C2 is grounded.

10. A hearing aid, characterized by Comprise: A pair of earphones; A charging bin, the charging bin is internally provided with a containing space for containing earphones, and the earphones are plug-connected in the containing space; Wherein, the charging bin is further provided with the in-ear hearing aid communication circuit according to any one of claims 1-9, and the charging bin is electrically connected with the earphones through the in-ear hearing aid communication circuit.

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