Communication switching circuit and hearing aid

Abstract

The embodiment of the utility model relates to the technical field of hearing aids, in particular to a communication switching circuit and a hearing aid. According to the utility model, the interface circuit, the insertion detection circuit, the power supply output circuit, the communication interaction circuit and the master control circuit are arranged, and the master control circuit is connected with the insertion detection circuit, the power supply output circuit and the communication interaction circuit and is used for receiving detection signals and controlling the power supply output circuit or the communication interaction circuit to be switched on and off according to the detection signals; therefore, charging connection or communication connection between the charging bin and the earphone is controlled. The power supply output circuit and the communication interaction circuit are connected to the second contact at the same time and are controlled by the master control circuit to be switched, one contact can be multiplexed for charging and communication, compatible design in multiple stages such as software development, PCB circuit board, shell design and material composition is greatly reduced, the production cost is reduced, and the production efficiency is improved. Meanwhile, through the design of the utility model, the integrity of the earphone and the charging cabin is higher.

Description

Technical Field

[0001] This utility model relates to the field of hearing aid technology, specifically to a communication switching 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 sound. This brings great convenience to the hearing-impaired. Hearing aids generally consist of an earpiece and a charging case. In current technology, the earpiece, after being inserted into the charging case, needs to communicate with it to obtain parameters such as the hearing aid model, charging parameters, and charging status. Both the earpiece and the charging case have communication contacts for transmitting and receiving information, plus the necessary positive and negative charging contacts. This results in multiple contacts within the hearing aid, requiring compatible design at multiple stages, including software development, PCB circuit board, casing design, and material composition. This increases costs and reduces the overall integrity of the hearing aid. Utility Model Content

[0003] In view of the above problems, this utility model provides a communication switching circuit and a hearing aid, which solves the problem that in the prior art, both the earphone and the charging case have communication contacts for sending and receiving information, plus the necessary positive and negative charging contacts, which results in multiple contacts in the hearing aid. This leads to higher costs in multiple stages such as software development, PCB circuit board, shell design, and material composition, and also results in poor overall hearing aid performance.

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

[0005] The interface circuit has at least a first contact and a second contact for electrically connecting the charging case and the earphones;

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

[0007] A power supply output circuit, connected to the second contact, is used to control the power output of the charging case;

[0008] A communication interaction circuit, connected to the second contact, is used to control the communication output of the charging case;

[0009] The main control circuit is connected to the insertion detection circuit, power supply output circuit, and communication interaction circuit. It is used to receive detection signals and control the power supply output circuit or communication interaction circuit to control the charging connection or communication connection between the charging case and the earphones according to the detection signals.

[0010] In some optional embodiments, the main control circuit includes a main control chip, which has a detection terminal, a power supply enable terminal, and a communication enable terminal. The detection terminal is connected to the insertion detection circuit, the power supply enable terminal is connected to the power supply output circuit, and the communication enable terminal is connected to the communication interaction circuit.

[0011] In some alternative embodiments, the insertion detection circuit includes a first switching circuit and a second switching circuit.

[0012] The enable terminal of the first switching circuit is connected to the switch terminal of the main control chip, and the first switching circuit is used to control the connection of the first contact to the ADC terminal of the main control chip.

[0013] The enable terminal of the second switching circuit is connected to the first contact, and the first switching circuit is used to control the level change of the detection terminal according to the signal of the first contact.

[0014] In some alternative embodiments, the first switching circuit includes a MOSFET Q1, resistors R1, R2, R3, and R4.

[0015] In this configuration, the gate of the MOS transistor Q1 is connected to resistors R1 and R2, the source is connected to the first contact and the second switching circuit, and the drain is connected to resistors R3 and R4. The other end of resistor R1 is connected to the switching terminal of the main control chip, the other end of resistor R4 is connected to the ADC terminal of the main control chip, and the other ends of resistors R2 and R3 are grounded.

[0016] In some alternative embodiments, the second switching circuit includes a transistor Q2, a resistor R5, a resistor R6, and a resistor R7;

[0017] The base of transistor Q2 is connected to resistors R5 and R6, the collector is connected to the detection terminal and resistor R7, and the emitter is grounded; the other end of resistor R5 is connected to the first 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.

[0018] In some alternative embodiments, the power supply output circuit includes MOSFET Q3, MOSFET Q4, fuse F1, resistor R8, and resistor R9.

[0019] In this configuration, the gate of MOS transistor Q3 is connected to the power enable terminal and resistor R8, the source is connected to the gate of MOS transistor Q4 and resistor R9, and the drain is grounded; the other end of resistor R8 is grounded.

[0020] The source of the MOS transistor Q4 is connected to the second power supply and the other end of the resistor R9, and the drain is connected to the second contact through a fuse.

[0021] In some alternative embodiments, the communication interaction circuit includes MOSFET Q5, MOSFET Q6, resistor R10, resistor R11, and resistor R12.

[0022] The gate of the MOS transistor Q5 is connected to the communication enable terminal and resistor R10, the source is connected to the gate of the MOS transistor Q6 and resistor R11, and the drain is grounded.

[0023] The source of the MOS transistor is connected to the second contact and the other end of resistor R11, and the drain is connected to the communication terminal of the main control chip and resistor R12; the other ends of resistors R10 and R12 are grounded.

[0024] In some optional embodiments, the interface circuit further includes diode D1, diode D2, and capacitor C1.

[0025] Wherein, the first end of diode D1 and the first end of capacitor C1 are connected to the first contact, and the second end of diode D1 and the second end of capacitor C1 are grounded; the first end of diode D2 is connected to the second contact, and the second end of diode D2 is grounded.

[0026] In some alternative embodiments, the charging case is paired with two of the earphones, and the interface circuit also has a third contact and a fourth contact. The charging case is connected to the left earphone via a first contact and a second contact, and to the right earphone via the third contact and the fourth contact.

[0027] Secondly, this utility model provides a hearing aid, comprising:

[0028] A pair of headphones;

[0029] 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;

[0030] The charging case is also equipped with the aforementioned communication switching circuit, and the charging case is electrically connected to the earphones through the communication switching circuit.

[0031] Compared to existing technologies, the advantages of this invention are as follows: This invention incorporates an interface circuit, an insertion detection circuit, a power output circuit, a communication interaction circuit, and a main control circuit. The main control circuit is connected to the insertion detection circuit, the power output circuit, and the communication interaction circuit to receive detection signals and control the on / off state of the power output circuit or the communication interaction circuit based on the detection signals, thereby controlling the charging connection or communication connection between the charging case and the earphones. By simultaneously connecting the power output circuit and the communication interaction circuit to the second contact and controlling the switching by the main control circuit, charging and communication can be reused on a single contact. This significantly reduces the need for compatibility design across multiple stages, including software development, PCB circuit board design, shell design, and material composition. This not only lowers production costs but also enhances the overall integration of the earphones and charging case.

[0032] 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

[0033] 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:

[0034] Figure 1 This invention provides a schematic diagram of the communication switching circuit according to Embodiment 1.

[0035] Figure 2 The circuit diagram of the main control circuit provided in Embodiment 2 of this utility model is shown;

[0036] Figure 3 The circuit diagram of the insertion detection circuit according to Embodiment 2 of this utility model is shown;

[0037] Figure 4 The circuit diagram of the power supply output circuit of Embodiment 2 of this utility model is shown;

[0038] Figure 5 The circuit diagram of the communication interaction circuit according to Embodiment 2 of this utility model is shown;

[0039] Figure 6 The circuit diagram of the interface circuit provided in Embodiment 2 of this utility model is shown.

[0040] Figure label:

[0041] 110. Main control circuit; 120. Interface circuit; 130. Power supply output circuit; 140. Communication interaction circuit; 150. Insertion detection circuit;

[0042] P1-, First contact, 5V_L, Second contact, P2-, Third contact, 5V_R, Fourth contact, VCC, First power supply; CH1_IN_CHK, Detection terminal; CH1_SW, Switch terminal; CH1_ADC, ADC terminal; VCC_5V, Second power supply; PATTER_L, Communication terminal; PATTER_L_EN, Communication enable terminal; 5V_L_EN, Power supply enable terminal. Detailed Implementation

[0043] 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.

[0044] Example 1:

[0045] Figure 1 The present invention illustrates a first embodiment of a communication switching circuit applied in the charging case of a hearing aid. The circuit includes an interface circuit 120, an insertion detection circuit 150, a power supply output circuit 130, a communication interaction circuit 140, and a main control circuit 110.

[0046] The interface circuit 120 is provided with at least a first contact P1- and a second contact 5V_L for electrically connecting the charging case and the earphones. The first contact P1- and the second contact 5V_L each have two endpoints. The first endpoint of the first contact P1- is connected to the charging case, and the second endpoint of the first contact P1- is connected to the earphones. The first endpoint of the second contact 5V_L is connected to the charging case, and the second endpoint of the second contact 5V_L is connected to the earphones.

[0047] The insertion detection circuit 150 is connected to the first contact P1- and is used to acquire the detection signal generated by the connection between the earphone and the interface circuit 120. When the earphone is inserted into the charging case, the earphone is connected to the first contact P1- and the second contact 5V_L, so that the electrical information on the earphone is output to the insertion detection circuit 150 through the first contact P1-. The insertion detection circuit 150 detects the detection signal and transmits it to the main control circuit 110 through communication.

[0048] The power output circuit 130 is connected to the second contact 5V_L and is used to control the power output of the charging case. The power output circuit 130 can be used to output the power of the battery in the charging case or the power obtained by connecting the charging case to an external charger to the earphone through the second contact 5V_L. The power output circuit 130 is controlled by the main control circuit 110. When the power enable terminal 5V_L_EN of the main control circuit 110 outputs a high level, the power output circuit 130 is turned on to supply power.

[0049] The communication interaction circuit 140, connected to the second contact 5V_L, is used to control the communication output of the charging case. The communication interaction circuit 140 can be used to exchange parameters such as the hearing aid model, charging parameters, and charging status between the charging case and the earphone, or for the earphone to communicate with an external mobile terminal through the charging case. The communication interaction circuit 140 is controlled by the main control circuit 110. When the communication enable terminal PATTER_L_EN of the main control circuit 110 outputs a high level, the communication interaction circuit 140 enables communication.

[0050] The main control circuit 110 is connected to the insertion detection circuit 150, the power supply output circuit 130 and the communication interaction circuit 140. It is used to receive detection signals and control the power supply output circuit 130 or the communication interaction circuit 140 to switch on or off according to the detection signals, so as to control the charging connection or communication connection between the charging case and the earphone.

[0051] In the above solution, this utility model sets up an interface circuit 120, an insertion detection circuit 150, a power output circuit 130, a communication interaction circuit 140, and a main control circuit 110. The main control circuit 110 is connected to the insertion detection circuit 150, the power output circuit 130, and the communication interaction circuit 140 to receive detection signals and control the power output circuit 130 or the communication interaction circuit 140 to switch on and off according to the detection signals, thereby controlling the charging connection or communication connection between the charging case and the earphones. By simultaneously connecting the power output circuit 130 and the communication interaction circuit 140 to the second contact 5V_L and controlling the switching by the main control circuit 110, charging and communication can be reused on a single contact. This greatly reduces the need for compatibility design in multiple stages such as software development, PCB circuit board, shell design, and material composition, not only reducing production costs but also making the earphones and charging case more integrated through this utility model design.

[0052] Example 2:

[0053] Figures 2-6 The present invention illustrates a second embodiment of a communication switching circuit, which is applied in the charging case of a hearing aid. The circuit includes an interface circuit 120, an insertion detection circuit 150, a power supply output circuit 130, a communication interaction circuit 140, and a main control circuit 110.

[0054] In such Figure 2 In the illustrated embodiment, the main control circuit 110 includes a main control chip. The main control chip has a detection terminal CH1_IN_CHK, a power enable terminal 5V_L_EN, and a communication enable terminal PATTER_L_EN. The detection terminal CH1_IN_CHK is connected to the insertion detection circuit 150, the power enable terminal 5V_L_EN is connected to the power output circuit 130, and the communication enable terminal PATTER_L_EN is connected to the communication interaction circuit 140. In this embodiment, the main control chip can be a control chip of model U_N32L406CBL7_LQFP48, and peripheral circuits are provided around the main control chip to maintain its normal operation. The main control chip receives detection signals and controls the power output circuit 130 or the communication interaction circuit 140 to switch on or off according to the detection signals, thereby controlling the charging connection or communication connection between the charging case and the earphones.

[0055] In such Figure 3 In the illustrated embodiment, the insertion detection circuit 150 includes a first switching circuit and a second switching circuit. The enable terminal of the first switching circuit is connected to the switch terminal CH1_SW of the main control chip, and the first switching circuit is used to control the connection of the first contact P1- with the ADC terminal CH1_ADC of the main control chip. 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 ADC terminal CH1_ADC. Furthermore, the first switching circuit can be normally turned on when the charging case is powered on or has power, so that the electrical signal of the first contact P1- can be accurately sent to the 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 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, and can change the voltage of the detection terminal CH1_IN_CHK according to the electrical signal of the first contact P1-, thereby enabling the main control circuit 110 to recognize the earphone insertion.

[0056] In a specific example of the above embodiment, the first switching circuit includes a MOSFET Q1, resistors R1, R2, R3, and R4. The gate of MOSFET Q1 is connected to resistors R1 and R2, its source is connected to the first contact P1- and the second switching circuit, and its drain is connected to resistors R3 and R4. The other end of resistor R1 is connected to the switching terminal CH1_SW of the main control chip, and the other end of resistor R4 is connected to the ADC terminal CH1_ADC of the main control chip. The other ends of resistors R2 and R3 are grounded. In this embodiment, MOSFET Q1 can be turned on by default under the control of the main control chip. This allows the ADC terminal CH1_ADC to recognize the signal from the first contact P1-. Resistors R1, R2, R3, and R4 are used for voltage divider protection to ensure the normal operation of the first switching circuit.

[0057] The second switching circuit includes transistor Q2, resistors R5, R6, and R7. The base of transistor Q2 is connected to resistors R5 and R6, the collector is connected to the detection terminal CH1_IN_CHK and resistor R7, and the emitter is grounded. The other end of resistor R5 is connected to the first contact P1- 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 headphones are connected to interface circuit 120, the level of the first contact P1- is high, which turns on transistor Q2, thereby pulling the signal at the detection terminal CH1_IN_CHK low, allowing the main control signal to recognize that the headphones are connected. Resistors R5, R6, and R7 are used for voltage divider protection to ensure the normal operation of the second switching circuit.

[0058] In such Figure 4In the illustrated embodiment, the power supply output circuit 130 includes MOSFETs Q3 and Q4, a fuse F1, resistors R8 and R9. The gate of MOSFET Q3 is connected to the power enable terminal 5V_L_EN and resistor R8, the source is connected to the gate of MOSFET Q4 and resistor R9, and the drain is grounded. The other end of resistor R8 is grounded. The source of MOSFET Q4 is connected to the second power supply VCC_5V and the other end of resistor R9, and the drain is connected to the second contact 5V_L via the fuse. Upon receiving the signal from the power enable terminal 5V_L_EN, the power supply output circuit 130 controls the conduction of MOSFET Q4, thereby controlling the second power supply VCC_5V to power the headphones. MOSFET Q3 is an NMOS transistor, and MOSFET Q4 is a PMOS transistor. When the power enable terminal 5V_L_EN is high, MOSFET Q3 conducts, pulling the signal of MOSFET Q4 low and enabling it to conduct, thus allowing the second power supply VCC_5V to power the headphones. When the power supply enable pin 5V_L_EN is low, MOSFET Q3 is turned off, preventing MOSFET Q4 from conducting and thus disconnecting the second power supply VCC_5V from the headphones. Fuse F1 is used to trigger and blow in case of over-temperature or over-voltage, protecting the circuit. Resistors R8 and R9 are used to divide the voltage, ensuring that MOSFETs Q3 and Q4 operate normally.

[0059] In such Figure 5 In the illustrated embodiment, the communication interaction circuit 140 includes MOSFETs Q5 and Q6, resistors R10, R11, and R12. The gate of MOSFET Q5 is connected to the communication enable terminal PATTER_L_EN and resistor R10, the source is connected to the gate of MOSFET Q6 and resistor R11, and the drain is grounded. The source of the MOSFET is connected to the second contact 5V_L and the other end of resistor R11, and the drain is connected to the communication terminal PATTER_L of the main control chip and resistor R12. The other ends of resistors R10 and R12 are grounded. Upon receiving the signal from the communication enable terminal PATTER_L_EN, the communication interaction circuit 140 controls the conduction of MOSFET Q6, thereby controlling the second power supply VCC_5V to power the earphones. MOSFET Q5 is an NMOS transistor, and MOSFET Q6 is a PMOS transistor. When the communication enable pin PATTER_L_EN is high, MOSFET Q5 is turned on, pulling the signal of MOSFET Q6 low and enabling communication between the main control chip and the headset. When the communication enable pin PATTER_L_EN is low, MOSFET Q5 is turned off, preventing MOSFET Q6 from conducting and disconnecting the main control chip from the headset. Resistors R10, R11, and R12 are used for voltage division to ensure the normal operation of MOSFETs Q5 and Q6.

[0060] In such Figure 6In the illustrated embodiment, the interface circuit 120 further includes diodes D1 and D2 and capacitor C1. The first terminals of diode D1 and capacitor C1 are connected to the first contact P1-, and the second terminals of diode D1 and capacitor C1 are grounded. The first terminal of diode D2 is connected to the second contact 5V_L, and the second terminal of diode D2 is grounded. In this embodiment, diodes D1, D2, and capacitor C1 are used to protect the interface circuit 120 and stabilize the signals at the first contact P1- and the second contact 5V_L.

[0061] In some alternative embodiments, the charging case is paired with two earbuds. The interface circuit 120 also has a third contact P2- and a fourth contact 5V_R. The charging case is connected to the left earbud via a first contact P1- and a second contact 5V_L, and to the right earbud via the third contact P2- and the fourth contact 5V_R. In this embodiment, there are two insertion detection circuits 150, two power output circuits 130, and two communication interaction circuits 140, respectively used to connect the charging case to the two earbuds. The circuit components connecting the two earbuds are identical and have the same function. The charging case can be connected to both earbuds for communication or charging simultaneously.

[0062] In addition, in this embodiment, the first power supply VCC and the second power supply VCC_5V can be provided by the power supply battery and the external charger. The power output from the power supply battery and the external charger is stepped down or regulated by the LDO chip to supply power to the earphone and charging case circuit.

[0063] Example 3:

[0064] 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 receiving space for accommodating the earphones, and the earphone plug is disposed within the receiving space. The charging case also includes a communication switching circuit as described in Embodiment 1 or Embodiment 2, and the charging case is electrically connected to the earphones via the communication switching 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 on the PCB circuit board. Through the communication switching circuit, the main control chip can control the connection of the positive charging contact with the power supply output circuit or the communication interaction circuit: connection to the second power supply enables normal charging; connection to the main control chip's communication terminal enables communication with the hearing aid; or, it can be neither connected to the second power supply nor to the main control chip's communication terminal.

[0065] The specific communication connection process for the hearing aid is as follows: The charging case detects the hearing aid being inserted, and its main control chip connects the second contact to the communication terminal, initiating communication with the earphone. If the earphone detects that the second power supply is disconnected but is still in the inserted state, it uses a Hall sensor to detect this and interprets it as a communication request from the charging case. It then connects its second contact to the communication terminal as well, allowing communication between the charging case and the earphone. After communication is complete, both devices disconnect the communication pin from the second contact. The charging case's second contact then connects to the second power supply, and normal charging begins.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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. A communication switching circuit, characterized by comprising: The application is applied to a charging bin of a hearing aid, and the circuit comprises: an interface circuit provided with at least a first contact and a second contact, and used for electrically connecting the charging bin and the earphone; an insertion detection circuit connected with the first contact, and used for obtaining a detection signal generated by connecting the earphone with the interface circuit; a power supply output circuit connected with the second contact, and used for controlling power supply output of the charging bin; a communication interaction circuit connected with the second contact, and used for controlling communication output of the charging bin; and a master control circuit connected with the insertion detection circuit, the power supply output circuit and the communication interaction circuit, used for receiving the detection signal, and controlling the power supply output circuit or the communication interaction circuit to be turned on or turned off according to the detection signal, so as to control charging connection or communication connection of the charging bin and the earphone.

2. The communication switching circuit according to claim 1, wherein The master control circuit comprises a master control chip, the master control chip is provided with a detection end, a power supply enable end and a communication enable end, the detection end is connected with the insertion detection circuit, the power supply enable end is connected with the power supply output circuit, and the communication enable end is connected with the communication interaction circuit.

3. The communication switching circuit of claim 2, wherein, The insertion detection circuit comprises a first switch circuit and a second switch circuit, the enable end of the first switch circuit is connected with a switch end of the master control chip, and the first switch circuit is used for controlling the first contact to be connected with an ADC end of the master control chip; the enable end of the second switch circuit is connected with the first contact, and the first switch circuit is used for controlling the level of the detection end to be changed according to the signal of the first contact.

4. The communication switching circuit of claim 3, wherein, The first switch circuit comprises a MOS tube Q1, a resistor R1, a resistor R2, a resistor R3 and a resistor R4, wherein, the gate of the MOS tube Q1 is connected with the resistor R1 and the resistor R2, the source is connected with the first contact and the second switch circuit, and the drain is connected with the resistor R3 and the resistor R4; the other end of the resistor R1 is connected with the switch end of the master control chip, the other end of the resistor R4 is connected with the ADC end of the master control chip, and the other ends of the resistor R2 and the resistor R3 are grounded.

5. The communication switching circuit of claim 4, wherein, The second switch circuit comprises a triode Q2, a resistor R5, a resistor R6 and a resistor R7; the base of the triode Q2 is connected with the resistor R5 and the resistor R6, the collector is connected with the detection end and the resistor R7, and the emitter is grounded; the other end of the resistor R5 is connected with the first contact and the first switch circuit, the other end of the resistor R7 is connected with the first power supply, and the other end of the resistor R6 is grounded.

6. The communication switching circuit of claim 2, wherein, The power supply output circuit comprises a MOS tube Q3, a MOS tube Q4, a fuse F1, a resistor R8 and a resistor R9, wherein, the gate of the MOS tube Q3 is connected with the power supply enable end and the resistor R8, the source is connected with the gate of the MOS tube Q4 and the resistor R9, and the drain is grounded; the other end of the resistor R8 is grounded; the source of the MOS tube Q4 is connected with the second power supply and the other end of the resistor R9, and the drain is connected with the second contact through the fuse.

7. The communication switching circuit of claim 2, wherein, The communication interaction circuit comprises a MOS tube Q5, a MOS tube Q6, a resistor R10, a resistor R11 and a resistor R12, The gate of the MOS tube Q5 is connected with the communication enable end and the resistor R10, the source is connected with the gate of the MOS tube Q6 and the resistor R11, and the drain is grounded. The source of the MOS tube is connected with the second contact and the other end of the resistor R11, and the drain is connected with the communication end of the master control chip and the other end of the resistor R12.

8. The communication switching circuit of claim 1, wherein, The interface circuit further comprises a diode D1, a diode D2 and a capacitor C1, The first end of the diode D1 and the first end of the capacitor C1 are connected with the first contact, the second end of the diode D1 and the second end of the capacitor C1 are grounded, the first end of the diode D2 is connected with the second contact, and the second end of the diode D2 is grounded.

9. The communication switching circuit of claim 8, wherein, The charging bin is matched with two earphones, the interface circuit further has a third contact and a fourth contact, the charging bin is connected with the left earphone through the first contact and the second contact, and the charging bin is connected with the right earphone through the third contact and the fourth contact.

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

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