Low-power-consumption hearing aid circuit and hearing aid

Abstract

The low-power-consumption hearing aid circuit comprises a main control chip, a pickup circuit, a sound playback circuit and a power supply circuit, wherein the main control chip is provided with a pickup end, a sound playback end and a first power supply input end, the pickup end is connected with the pickup circuit, and the sound playback end is connected with the sound playback circuit; the power supply circuit comprises a power supply chip, a first power supply input end of the power supply chip is connected with a battery power supply, and a first power supply output end of the power supply chip is connected with the hearing aid power supply end of the main control chip; the power supply chip is provided with an adjusting end, and the adjusting end is connected with the first resistor so as to reduce the voltage of the battery power and output the voltage to the main control chip for power supply. According to the voltage reduction circuit, the output voltage of the voltage reduction circuit can be changed according to requirements, so that a traditional circuit adopting a plurality of divider resistors and a corresponding filter circuit are replaced, the overall power consumption of the circuit is reduced, the circuit does not need to be redesigned according to the required voltage reduction voltage, and the time cost of repeated design of the circuit is reduced.

Description

Technical Field

[0001] The utility model relates to the field of hearing aid circuits, and in particular to a low-power hearing aid circuit and a hearing aid. Background Art

[0002] A Bluetooth hearing aid is a hearing aid that can be wirelessly connected to other devices via Bluetooth technology. This type of hearing aid allows users to hear the sound of devices such as televisions, phones, and computers more conveniently, improving the hearing experience of people with hearing loss. However, as the existing technology becomes increasingly mature, hearing aids are no longer satisfied with only having basic functions and achieving basic hearing aid effects. Instead, there are increasingly higher requirements for the reliability, performance, and most importantly, battery life of hearing aids.

[0003] In order to achieve this requirement, the existing hearing aid technology must be optimized and designed. Among them, one of the ways to improve the reliability and life of the equipment is to reduce the power consumption of the entire hearing aid device circuit. In some existing hearing aid circuits, especially some circuits that need to step down the voltage, the simplest voltage division method is often used to step down the voltage. Although this method can directly achieve the function of stepping down the voltage, the power consumption is relatively large, which can easily cause the temperature of the entire hearing aid circuit to rise and cause component damage, resulting in this method. The service life of the entire hearing aid circuit is greatly reduced. In addition, fixed voltage divider resistors are not flexible for circuits with multiple voltages, especially when the hearing aid product specifications are different and the required voltages are different, so the step-down circuit must be redesigned, which is very inflexible.

[0004] Therefore, we need a new way to reduce circuit power consumption specifically for hearing aids, which can reduce the power consumption of hearing aid circuits while also flexibly reducing the voltage according to demand. Utility Model Content

[0005] The utility model provides a low-power hearing aid circuit and a hearing aid. The circuit is provided with a DC-DC step-down power supply circuit. The circuit can change the output voltage by adjusting the resistance, thereby reducing the voltage of the external voltage to meet the voltage requirement of the Bluetooth hearing aid circuit. Moreover, the DC-DC step-down power supply circuit reduces the power consumption by 30% by eliminating the filter circuit and its voltage-dividing resistor. The circuit can replace the adjusting resistor according to the demand, thereby realizing a variety of voltage outputs without changing the circuit.

[0006] The purpose of the utility model is achieved through the following technical solutions:

[0007] In a first aspect, the utility model provides a low-power hearing aid circuit, including a main control chip, a sound pickup circuit, a sound playback circuit, and a power supply circuit;

[0008] The main control chip is provided with a sound pickup terminal, a sound playback terminal, and a first power input terminal, the sound pickup terminal is connected to the sound pickup circuit, and the sound playback terminal is connected to the sound playback circuit;

[0009] Among them, the power supply circuit includes a power supply chip, the first power input terminal of the power supply chip is connected to the battery power supply, and the first power output terminal of the power supply chip is connected to the hearing aid power supply terminal of the main control chip; the power supply chip is provided with an adjustment terminal, and the adjustment terminal is connected to the first resistor to step down the battery power supply and output it to the main control chip for power supply.

[0010] In some embodiments, the hearing aid circuit is based on a main control chip, which has Bluetooth and hearing aid cores, and is connected to a pickup circuit and a sound playback circuit through pins to realize the hearing aid function; wherein the Bluetooth core and the power supply circuit respectively provide different power supply voltages for the hearing aid circuit; the volume of the surrounding environment is captured by the pickup circuit, and the volume is amplified by the sound playback circuit to realize basic hearing aid functions, and the power supply circuit steps down the voltage in the lithium battery so that the voltage meets the requirements of some low-voltage functions; by using a DC-DC step-down power supply circuit for voltage regulation instead of using a resistor divider, the power consumption of the circuit can be effectively reduced by 30%, and the voltage can be selected according to demand without changing the circuit by connecting an adjustment resistor to the adjustment end, and the voltage is provided to the hearing aid core and SRAM built into the main control chip with a low voltage for normal operation.

[0011] In some embodiments, the power supply circuit also includes a first inductor, a first capacitor, a second capacitor, and a third capacitor. The first capacitor is connected to the first power input terminal, the switch control terminal of the power supply chip is connected to the first inductor, and the other end of the first inductor is connected to the first power output terminal of the power supply chip, the second capacitor, and the third capacitor, and outputs a step-down power supply; the power supply circuit steps down the circuit based on the step-down chip to meet the needs of the main control chip, or other low-voltage circuits; the first capacitor is an input capacitor that filters the input voltage; the second capacitor and the third capacitor are output capacitors that filter the output voltage. The two are selected in different sizes and connected in parallel, and can filter high-frequency and low-frequency signals respectively to improve the filtering quality. The first inductor can form an LC filter with the third capacitor and the second capacitor to improve the efficiency and quality of filtering. In hearing aids, it can effectively improve the anti-interference ability and stability.

[0012] Optionally, the second capacitor can be used as an input capacitor and is arranged in parallel with the first capacitor.

[0013] Optionally, the second capacitor and the third capacitor are combined into one capacitor for filtering.

[0014] The other ends of the first capacitor, the second capacitor and the third capacitor are grounded; a power supply grounding terminal is also provided on the power supply chip for grounding.

[0015] The power supply chip is also provided with an enable terminal connected to the main control chip, and the enable terminal is connected to a high level generated inside the main control chip to turn on the chip.

[0016] In some embodiments, the pickup circuit includes a pickup chip, a second resistor, a third resistor, a fourth capacitor, and a fifth capacitor;

[0017] The sound pickup chip is provided with a clock input terminal, a data output terminal, and a second power input terminal; the clock input terminal and the data output terminal are respectively connected to the sound pickup terminal of the main control chip, the second resistor and the fourth capacitor are connected to the second power input terminal, and the third resistor and the fifth capacitor are connected to the data output terminal; the sound pickup terminal of the main control chip includes two pins of the main control chip, one is a data pin for receiving a microphone, which is used for the main control chip to receive data from the microphone, and the other is a clock pin for connecting the microphone to output a clock signal, and the microphone is used to receive the clock signal of the chip; the clock input terminal is connected to the clock output pin, and the data output terminal is connected to the data input pin. By setting the fourth capacitor and the fifth capacitor to be grounded, the interference of the signal can be reduced, the signal can be filtered, and the grounding connection of the third resistor to the data output terminal can improve the anti-interference ability of data transmission, ensure stable data transmission and reduce distortion. The second resistor setting can achieve impedance matching and improve the quality of the transmission signal while improving the anti-interference ability and filtering of the protection circuit.

[0018] The other ends of the second resistor, the third resistor, the fourth capacitor and the fifth capacitor are grounded, and the pickup chip also has a ground end that is grounded.

[0019] In some embodiments, the audio amplifier circuit includes a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, and a sixth capacitor, and the audio amplifier terminal includes a positive audio amplifier terminal and a negative audio amplifier terminal;

[0020] One end of the fourth resistor is connected to the positive sound amplification end, the other end of the fourth resistor is connected to the fifth resistor and the sixth capacitor, and the other end of the fifth resistor is connected to the positive electrode of the speaker;

[0021] One end of the sixth resistor is connected to the negative sound amplifier end, the other end of the sixth resistor is connected to the seventh resistor and the sixth capacitor, and the other end of the seventh resistor is connected to the negative electrode of the speaker. By adding resistors between the speakers, it helps to improve the stability of the speaker circuit, and the sixth capacitor is set in the middle to filter the signal and improve the sound amplification quality of the hearing aid. The setting of the resistor can also reduce the circuit current to within the use current of the main control chip.

[0022] In some embodiments, a Hall switch circuit is further included, and the Hall switch circuit includes a switch chip, a seventh capacitor, an eighth resistor, and a ninth resistor;

[0023] The third power input terminal of the switch chip is connected to the battery power supply and the seventh capacitor, and the switch voltage output terminal of the switch chip is connected to the box entry detection terminal of the main control chip and the ninth resistor through the eighth resistor; the box entry detection is used to detect the charging state of the circuit. Through this circuit, when charging, the switch signal can be output through the switch chip and returned to the chip box entry detection terminal. A high level is output during normal charging, and a low level is output otherwise.

[0024] The seventh capacitor is used as an input capacitor to filter the input end, and the resistor is used to divide the voltage and perform circuit protection.

[0025] The other ends of the seventh capacitor and the ninth resistor are grounded, and the Hall switch is also provided with a grounding end for grounding.

[0026] In some embodiments, a charging circuit is further included, the charging circuit including a charging chip, an eighth capacitor, a ninth capacitor, a tenth resistor, a positive charging contact, a negative charging contact, a first electrostatic tube, and a tenth capacitor; the charging chip includes a fourth power input terminal, a constant current terminal, a chip control terminal, and a charging terminal;

[0027] The positive charging contact is connected to the first electrostatic tube, the eighth capacitor, the ninth capacitor, and the third power input terminal; the charging terminal is connected to the tenth capacitor and connected to the battery input terminal for charging; the constant current terminal is connected to the tenth resistor; the charging circuit is provided with a charging management circuit based on a charging chip, which makes the charging voltage stable and can perform constant voltage charging. Among them, the eighth capacitor and the ninth capacitor are used as input capacitors to filter the input terminal, and the ninth capacitor is used as an output capacitor to filter the output terminal; the first electrostatic tube can protect the circuit; the tenth resistor can adjust the constant current charging current, and the constant current charging current can be changed by changing the resistance.

[0028] The eighth capacitor, the ninth capacitor, the tenth capacitor, the tenth resistor, the first electrostatic tube, and the negative charging contact are grounded, and the charging chip is also provided with a ground terminal.

[0029] In some embodiments, a battery protection circuit is further included, the battery protection circuit includes a battery protection chip, an eleventh resistor, a twelfth resistor, a thirteenth resistor, and an eleventh capacitor; the battery protection chip includes a fourth power input terminal, a load negative terminal, and a shipping reset terminal;

[0030] The battery protection chip is connected to the eleventh resistor, which is connected to the fifth power input terminal and the eleventh capacitor; the shipping reset terminal is connected to the twelfth resistor and connected to the shipping control terminal of the main control chip and the thirteenth resistor; the hearing aid can be selected for shipping mode and restart mode through the battery protection chip, and the circuit can monitor the voltage and current of the battery, and protect the single-cell rechargeable lithium battery from damage due to overcharge voltage, over-discharge voltage, charging overcurrent, discharging overcurrent and short circuit by disconnecting the charger or load, thereby performing charging protection. The positive and negative solder joints of the battery are connected to the input battery power and the ground terminal of the battery protection chip respectively.

[0031] The eleventh resistor, the twelfth resistor, the thirteenth resistor, the eleventh capacitor, and the negative terminal of the load are grounded, and the battery protection chip is also provided with a ground terminal.

[0032] The thirteenth resistor is set on the shipping control end of the main control chip of the left ear, and the shipping reset end introduced by the battery protection circuit is connected between the thirteenth resistor and the shipping control end. There is no resistor connected to the shipping control end of the main control chip of the right ear but it is directly grounded.

[0033] In some embodiments, a Bluetooth antenna circuit is further included, and the Bluetooth antenna circuit includes a twelfth capacitor, a thirteenth capacitor, a fourteenth resistor, a second electrostatic tube, and an antenna;

[0034] The antenna end of the main control chip is connected to the twelfth capacitor and the fourteenth resistor, and the other end of the fourteenth resistor is connected to the thirteenth capacitor, the second electrostatic tube, and the antenna; the antenna is used to receive the antenna signal of the Bluetooth core in the main control chip, the capacitor and the resistor are used to protect, filter and enhance the anti-interference ability of the antenna, and the second electrostatic tube is used for voltage protection and current regulation of the antenna module, as well as signal isolation and enhancement of the anti-interference ability of the antenna.

[0035] The twelfth capacitor, the thirteenth capacitor and the second electrostatic tube are grounded.

[0036] In some embodiments, the main control chip is also provided with a test terminal and a burning terminal; the main control chip is connected to an external test device through the test terminal and the burning terminal. The test terminal is mainly used to test the status of each voltage to determine whether each part of the hearing aid is in a normal working state, and the burning port is used to burn the I2C trial algorithm into the hearing aid.

[0037] In a second aspect, the present invention provides a hearing aid, comprising a low-power hearing aid circuit as provided in the first aspect.

[0038] In some embodiments, the hearing aid circuit described above is used to effectively reduce the power consumption of the circuit and improve the overall circuit efficiency.

[0039] The utility model provides a low-power hearing aid circuit and a hearing aid, which have the following effects:

[0040] A low-power hearing aid circuit is proposed, which includes a main control chip, a sound pickup circuit, a sound playback circuit, and a power supply circuit; wherein the main control chip is provided with a sound pickup end, a sound playback end, and a first power input end, the sound pickup end is connected to the sound pickup circuit, and the sound playback end is connected to the sound playback circuit; and the power supply circuit includes a power supply chip, the first power input end of the power supply chip is connected to the battery power supply, and the first power output end of the power supply chip is connected to the hearing aid power supply end of the main control chip; the power supply chip is provided with an adjustment end, and the adjustment end is connected to the first resistor to step down the battery power supply and output it to the main control chip for power supply. The output voltage of the step-down circuit can be changed according to demand, thereby replacing the traditional circuit designed with multiple voltage-dividing resistors and the corresponding filter circuit. This method reduces the overall power consumption of the circuit, and there is no need to redesign the circuit according to the required step-down voltage, thereby reducing the time cost of repeated circuit design. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is the principle diagram of the technical circuit of the utility model;

[0042] Figure 2 This is a circuit diagram of a low-power hearing aid circuit and a main control chip of the hearing aid of the utility model;

[0043] Figure 3 This is a low-power hearing aid circuit and a step-down circuit diagram of the hearing aid of the utility model;

[0044] Figure 4 This is a low-power hearing aid circuit and a sound amplifier circuit diagram of the hearing aid of the utility model;

[0045] Figure 5 This is a low-power hearing aid circuit and a switch circuit diagram of the hearing aid of the utility model;

[0046] Figure 6 This is a low-power hearing aid circuit and a charging contact diagram of the hearing aid of the utility model;

[0047] Figure 7 This is a low-power hearing aid circuit and a charging circuit diagram of the hearing aid of the utility model;

[0048] Figure 8 This is a low-power hearing aid circuit and a hearing aid battery protection circuit diagram of the utility model;

[0049] Reference numerals:

[0050] R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; R6, sixth resistor; R7, seventh resistor; R8, eighth resistor; R9, ninth resistor; R10, tenth resistor; R11, eleventh resistor; R12, twelfth resistor; R13, thirteenth resistor; R14, fourteenth resistor;

[0051] C1, first capacitor; C2, second capacitor; C3, third capacitor; C4, fourth capacitor; C5, fifth capacitor; C6, sixth capacitor; C7, seventh capacitor; C8, eighth capacitor; C9, ninth capacitor; C10, tenth capacitor; C11, eleventh capacitor; C12, twelfth capacitor; C13, thirteenth capacitor;

[0052] D1, first electrostatic tube; D2, second electrostatic tube; L1, first inductor;

[0053] U1, main control chip; U2, power supply chip; U3, sound pickup chip; U4, switch chip; U5, charging chip; U6, battery protection chip;

[0054] ch+, positive charging contact; ch-, negative charging contact; SPK+, positive sound output terminal; SPK-, negative sound output terminal;

[0055] U1_HA_VDD1VTOCORE, hearing aid power supply terminal; U1_HA_MIC1_PDM_CLK, clock output pin; U1_HA_MIC1_PDM_DAT, data input pin; U1_BT_PC5_INCHECK, box entry detection terminal; U1_BT_PB5_LR_SHIP, shipping control terminal; U1_BT_BTRF, antenna terminal; U1_BT_BTAVDD, first Bluetooth power supply terminal; U1_HA_VDDIO3V, first hearing aid power supply terminal; U1_HA_VDD1VTOCORE, second hearing aid power supply terminal; U1_BT_PC3_TESTDBG, chip test terminal; U1_BT_VBAT, battery output terminal; U1_BT_USBDM_HA_I2CDAT, first I2C debug terminal; U1_BT_USBDP_HA_I2CCLK, second I2C debug terminal;

[0056] U2_VSET, adjustment terminal; U2_IN, first power input terminal; U2_VOUT, first power output terminal; U2_SW, switch control terminal; U2_EN, enable terminal; U2_GND, power supply ground terminal;

[0057] U3_CLK, clock input terminal; U3_DATA, data output terminal; U3_GND, sound pickup ground terminal;

[0058] U4_VDD, second power input terminal; U4_GND, switch ground terminal;

[0059] U5_IN, the third power input terminal; U5_ISET, the constant current terminal; U5_EN, the chip control terminal; U5_BAT, the charging terminal; U5_GND, the charging ground terminal;

[0060] U6_VDD, the fourth power input terminal; U6_GND, the negative load terminal; U6_CTL, the shipping reset terminal;

[0061] BT_AVDD, the first test point; 3V1, the second test point; VSS, the third test point; 1V1, the fourth test point; TEST, the fifth test point; VBAT, the first programming port; DM, the second programming port; DP, the third programming port; GND, the fourth programming port; DETAILED DESCRIPTION

[0062] It should be noted that, in the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of the present invention and should not be regarded as an improper limitation on the present invention.

[0063] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the specific technical solution of the utility model will be further described in detail below in conjunction with the drawings in the embodiment of the utility model. The following embodiments are used to illustrate the utility model, but are not used to limit the scope of the utility model.

[0064] In the embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, unless otherwise specified, the meaning of "multiple" is two or more.

[0065] In addition, in the embodiments of the present invention, directional terms such as "up", "down", "left" and "right" are defined relative to the orientation of the components in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they may change accordingly according to the changes in the orientation of the components in the drawings.

[0066] In the embodiments of the present invention, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0067] In the embodiments of the present invention, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0068] In the embodiments of the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present invention should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present the related in a specific way.

[0069] Embodiment 1:

[0070] Reference Figures 1 to 8 , a Bluetooth hearing aid circuit and a circuit schematic diagram of a hearing aid are provided for the application.

[0071] A low-power hearing aid circuit, comprising a main control chip U1, a sound pickup circuit, a sound playback circuit, and a power supply circuit;

[0072] The main control chip U1 is provided with a sound pickup terminal, a sound amplifier terminal, and a first power input terminal U2_IN. The sound pickup terminal is connected to the sound pickup circuit, and the sound amplifier terminal is connected to the sound amplifier circuit.

[0073] Among them, the power supply circuit includes a power supply chip U2, a first power input terminal U2_IN of the power supply chip U2 is connected to the battery power supply, and a first power output terminal U2_VOUT of the power supply chip U2 is connected to the hearing aid power supply terminal U1_HA_VDD1VTOCORE on the main control chip U1; the power supply chip U2 is provided with an adjustment terminal U2_VSET, and the adjustment terminal U2_VSET is connected to the first resistor R1 to step down the battery power supply and output it to the main control chip U1 for power supply.

[0074] In other embodiments, the hearing aid circuit is based on the main control chip U1TINY600 series chip, which has independent Bluetooth and hearing aid cores, can meet the basic hearing aid sound pickup, sound playback and other needs, and has its own Bluetooth core for remote control. The Bluetooth module inside the chip can power the hearing aid module, and the rechargeable lithium battery can power the Bluetooth module. However, the voltage of some special hearing aids and SRAM cores, such as 1V, needs to be provided after the battery voltage is stepped down. The realization of this function is a step-down circuit built with the SX01P6CCR series chip as the main body, which steps down the input 3.7V voltage and then outputs a 1V voltage to provide the hearing aid and SRAM core. The SX01P6CCR series chip is provided with an adjustment terminal U2_VSET, and the adjustment terminal U2_VSET is connected to the first resistor R1. According to the resistance value of the resistor, the output terminal will be adjusted accordingly. Under the premise of requiring a 1V voltage, the adjustment resistor is selected to be 18K, so that the voltage of the first power output terminal U2_VOUT is 1V. By setting up a step-down circuit for the SX01P6CCR series chip instead of using a resistor divider, the power consumption of the circuit can be effectively reduced by 30%. In addition, by connecting an adjustment resistor to the adjustment terminal U2_VSET, the voltage can be selected as required without changing the circuit. This voltage provides a low voltage for normal operation to the hearing aid core and SRAM built into the main control chip U1.

[0075] Embodiment 2:

[0076] Based on Example 1, please refer to Figure 3 , this embodiment further explains and optimizes the step-down circuit.

[0077] In some other preferred embodiments, the power supply circuit further includes a first inductor L1, a first capacitor C1, a second capacitor C2, and a third capacitor C3, wherein the first capacitor C1 is connected to the first power input terminal U2_IN, the first inductor L1 is connected to the switch control terminal U2_SW of the power supply chip U2, and the other end of the first inductor L1 is connected to the first output power supply of the power supply chip U2, the second capacitor C2, and the third capacitor C3 and outputs a step-down power supply; a DC-DC step-down circuit constructed using a series of chips of SX01P6CCR, wherein the first capacitor C1 is 10uF, and the input voltage is filtered, and the second capacitor C2 and the third capacitor C3 are connected in parallel to the first power output terminal U2_VOUT using 10uF and 4.7uF respectively, so that the capacitor can filter signals of different frequencies and improve the filtering frequency band, and can resist high-frequency interference at the same time. At the same time, combined with the inductance selection of 1μH-2.2μH, the first inductor L1 selected as 1μH in this embodiment forms an LC low-pass filter, which more effectively improves the quality of filtering.

[0078] The power supply chip U2 is also provided with an enable terminal U2_EN connected to the main control chip U1. The enable terminal U2_EN is turned on by connecting to the 3V level generated by the first Bluetooth power terminal inside the main control chip U1TINY600 to turn on the chip.

[0079] The other ends of the first capacitor C1 , the second capacitor C2 , and the third capacitor C3 are grounded; a power supply ground terminal U2_GND is also provided on the power supply chip U2 for grounding.

[0080] In some other optional embodiments, the first capacitor C1 and the second capacitor C2 are connected in parallel at the first power input terminal U2_IN, the first capacitor C1 is 10μF-22μF, the second capacitor C2 is 100nF, the third capacitor C3 is 10μF-22μF, and the inductance is selected to be 1μH-2.2μH.

[0081] In some other optional embodiments, the first capacitor C1 is 10 μF-22 μF, the third capacitor C3 is 10 μF-22 μF, and the inductor is selected to be 1 μH-2.2 μH.

[0082] Embodiment 3:

[0083] Based on Example 3, please refer to Figures 4 to 8 This embodiment further optimizes and explains the functional module circuit of the hearing aid;

[0084] In some other preferred embodiments, the sound pickup circuit includes a sound pickup chip U3, a second resistor R2, a third resistor R3, a fourth capacitor C4, and a fifth capacitor C5;

[0085] The sound pickup chip U3 is provided with a clock input terminal U3_CLK, a data output terminal U3_DATA, and a second power input terminal U4_VDD; the clock input terminal U3_CLK and the data output terminal U3_DATA are respectively connected to the sound pickup terminal of the main control chip U1, the second resistor R2 and the fourth capacitor C4 are connected to the second power input terminal U4_VDD, and the third resistor R3 and the fifth capacitor C5 are connected to the data output terminal U3_DATA; wherein, the sound pickup chip U3 adopts the SPH18R1LM4H-1 series chip, and the clock input terminal U3_CLK and the data output terminal U3_DATA of the chip are respectively connected to the main control chip U1 through two sound pickup terminals, namely the clock output pin U1_HA_MIC1_PDM_CLK and the data input pin U1_HA_MIC1_PDM_DAT, for receiving the clock signal and data transmission of the main control chip U1. The fourth capacitor C4 and the fifth capacitor C5 play the role of filtering respectively, wherein the fourth capacitor C4 is 1μF, and the second resistor R2 is set to 4.7K, which can achieve impedance matching and improve the quality of the transmission signal while improving the anti-interference ability and filtering of the protection circuit. There are multiple combinations of the fifth capacitor C5 and the third resistor R3, which can be selected according to the situation. The other ends of the second resistor R2, the third resistor R3, the fourth capacitor C4, and the fifth capacitor C5 are grounded, and the pickup chip U3 also has a pickup ground terminal U3_GND for grounding.

[0086] In some other optional embodiments, the data output terminal U3_DATA is not provided with the third resistor R3 and the fifth resistor R5.

[0087] In some other embodiments, the audio amplifier circuit includes a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and a sixth capacitor C6, and the audio amplifier terminal includes a positive audio amplifier terminal SPK+ and a negative audio amplifier terminal SPK-;

[0088] One end of the fourth resistor R4 is connected to the positive sound amplification terminal SPK+, the other end of the fourth resistor R4 is connected to the fifth resistor R5 and the sixth capacitor C6, and the other end of the fifth resistor R5 is connected to the positive electrode of the speaker;

[0089] One end of the sixth resistor R6 is connected to the negative sound amplifier terminal SPK-, and the other end of the sixth resistor R6 is connected to the seventh resistor R7 and the sixth capacitor C6. The other end of the seventh resistor R7 is connected to the negative electrode of the speaker. The speaker uses a moving iron speaker. The positive and negative electrodes on the speaker are connected to the positive sound amplifier terminal SPK+ and the negative sound amplifier terminal SPK- through the sound amplifier circuit. The maximum output current is 4mA. Therefore, it is necessary to add the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, and the seventh resistor R7. The resistance specifications are all 100M / 600R to protect the circuit. The sixth capacitor C6 can be added to filter the signal and improve the sound amplification quality of the hearing aid.

[0090] In some other embodiments, a Hall switch circuit is further included, and the Hall switch circuit includes a switch chip U4, a seventh capacitor C7, an eighth resistor R8, and a ninth resistor R9;

[0091] The third power input terminal U5_IN of the switch chip U4 is connected to the battery power supply and the seventh capacitor C7, and the switch voltage output terminal of the switch chip U4 is connected to the box entry detection terminal U1_BT_PC5_INCHECK of the main control chip U1 and the ninth resistor R9 through the eighth resistor R8; wherein, the switch chip U4 adopts the KTH1604 series chip, and is powered by a battery with a 3.7V voltage such as the second power input terminal U4_VDD. During normal charging, a switch level of 1.98V-2.77V is output at the switch voltage output terminal and input into the box entry detection terminal U1_BT_PC5_INCHECK of the main control chip U1. This port is used to determine whether charging is normal.

[0092] The seventh capacitor C7 is used as an input capacitor to filter the input end, and the resistor is used to divide the voltage and perform circuit protection.

[0093] The other ends of the seventh capacitor C7 and the ninth resistor R9 are grounded, and the Hall switch is also provided with a switch grounding terminal U4_GND connected to ground.

[0094] In some other embodiments, a charging circuit is further included, the charging circuit including a charging chip U5, an eighth capacitor C8, a ninth capacitor C9, a tenth resistor R10, a positive charging contact ch+, a negative charging contact ch-, a first electrostatic tube D1, and a tenth capacitor C10; the charging chip U5 includes a third power input terminal U5_IN, a constant current terminal U5_ISET, a chip control terminal U5_EN, and a charging terminal U5_BAT;

[0095] The positive charging contact ch+ is connected to the first bidirectional breakdown diode, the eighth capacitor C8, the ninth capacitor C9, and the fourth power input terminal U6_VDD; the charging terminal U5_BAT is connected to the tenth capacitor C10 and connected to the battery input terminal for charging; the constant current terminal U5_ISET is connected to the tenth resistor R10; the charging circuit is provided with a charging management circuit based on the charging chip U5LP4077QVF, which makes the charging voltage stable and can perform constant voltage charging. Among them, the eighth capacitor C8 and the ninth capacitor C91μF are used as input capacitors to filter the input end, and the ninth capacitor C9 is used as an output capacitor, using 1μF to filter the output end; the first electrostatic tube D1 can protect the circuit; the tenth resistor R10 uses 6.8K to adjust the constant current charging current.

[0096] The eighth capacitor C8, the ninth capacitor C9, the tenth capacitor C10, the tenth resistor R10, the first electrostatic tube D1, and the negative charging contact ch- are grounded, and the charging chip U5 is also provided with a charging ground terminal U5_GND.

[0097] In some other embodiments, a battery protection circuit is further included, the battery protection circuit includes a battery protection chip U6, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, and an eleventh capacitor C11; the battery protection chip U6 includes a fourth power input terminal U6_VDD, a load negative terminal U6_GND, and a shipping reset terminal U6_CTL;

[0098] The battery protection chip U6 is connected to the eleventh resistor R11, and the eleventh resistor R11 is connected to the fourth power input terminal U6_VDD and the eleventh capacitor C11; the shipping reset terminal U6_CTL is connected to the twelfth resistor R12 and connected to the shipping control terminal U1_BT_PB5_LR_SHIP of the main control chip U1 and the thirteenth resistor R13; through the battery protection chip U6WSDF2311A series, through the shipping reset terminal U6_CTL and the shipping control terminal U1_BT_PB5_LR_SHIP of the main control chip U1, the shipping mode and restart mode of the hearing aid can be selected, and the circuit can monitor the voltage and current of the battery, and by disconnecting the charger or load, protect the single-cell rechargeable lithium battery from being damaged due to overcharging voltage, over-discharging voltage, charging overcurrent, discharging overcurrent and short circuit, thereby performing charging protection. The positive and negative welding points of the battery are connected to the input battery power and the grounding terminal of the battery protection chip U6, respectively, and the power supply is 3.7 / 17mah. The eleventh resistor R11 is 1K, and the eleventh capacitor C11 is 100nF.

[0099] The eleventh resistor R11 , the twelfth resistor R12 , the thirteenth resistor R13 , the eleventh capacitor C11 , and the load negative terminal U6_GND are grounded.

[0100] A thirteenth resistor R13 of 10K is connected to the shipping control terminal U1_BT_PB5_LR_SHIP of the main control chip U1 of the left ear and is grounded. The shipping reset terminal U6_CTL introduced by the battery protection circuit is connected between the thirteenth resistor R13 and the shipping control terminal U1_BT_PB5_LR_SHIP. There is no resistor connected to the shipping control terminal U1_BT_PB5_LR_SHIP of the main control chip U1 of the right ear but it is directly grounded. The thirteenth resistor R13 is used to determine whether the circuit is used for the left ear or the right ear.

[0101] In some other embodiments, a Bluetooth antenna circuit is further included, and the Bluetooth antenna circuit includes a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth resistor R14, a second electrostatic tube D2, and an antenna;

[0102] The antenna end U1_BT_BTRF of the main control chip U1 is connected to the twelfth capacitor C12 and the fourteenth resistor R14, and the other end of the fourteenth resistor R14 is connected to the thirteenth capacitor C13, the second electrostatic tube D2, and the antenna; the twelfth capacitor C12 uses 12nH, and the fourteenth resistor R14 uses 1.8nH. The antenna is used for receiving antenna signals of the Bluetooth core in the main control chip U1, and the capacitors and resistors are used for protection, filtering and improving the anti-interference ability of the antenna, and the second electrostatic tube D2 is used for voltage protection and current regulation of the antenna module, as well as signal isolation and improving the anti-interference ability of the antenna.

[0103] The twelfth capacitor C12, the thirteenth capacitor C13, and the second electrostatic tube D2.

[0104] In other embodiments, the main control chip U1 is also provided with a test terminal and a burning terminal; the main control chip U1 is connected to an external test device through the test terminal and the burning terminal. The test terminal is mainly used to test the status of each voltage to determine whether each part of the hearing aid is in a normal working state, and the burning port is used to burn the I2C trial algorithm into the hearing aid.

[0105] The test module includes a first test point BT_AVDD, a second test point 3V1, a third test point VSS, a fourth test point 1V1, and a fifth test point TEST; the first Bluetooth test point is connected to the first Bluetooth power supply terminal U1_BT_BTAVDD, the second test point 3V1 is connected to the first hearing aid power supply terminal U1_HA_VDDIO3V on the main control chip U1, the third test point VSS is connected to the second hearing aid power supply terminal U1_HA_VDD1VTOCORE on the main control chip U1, the grounding test point is connected to the grounding terminal of the main control chip U1, and the fifth test point TEST is connected to the chip test terminal U1_BT_PC3_TESTDBG of the main control chip U1;

[0106] The main control chip U1 also includes a burning module, which includes a first burning port VBAT, a second burning port DM, a third burning port DP, and a fourth burning port GND; the first burning port VBAT is connected to the battery output terminal U1_BT_VBAT, the second burning port DM is connected to the first I2C debugging terminal U1_BT_USBDM_HA_I2CDAT of the main control chip U1, the third burning port DP is connected to the second I2C debugging terminal U1_BT_USBDP_HA_I2CCLK of the main control chip U1, and the fourth burning port GND is grounded.

[0107] Embodiment 4:

[0108] Based on Example 1, this embodiment describes the specific application of the circuit.

[0109] A hearing aid includes a low power consumption hearing aid circuit.

[0110] In other embodiments, the hearing aid includes a hearing aid housing, a lithium battery, an integrated circuit board, a microphone, and a speaker; an integrated circuit board is disposed in the hearing aid housing, and a low-power hearing aid circuit of the utility model is disposed on the integrated circuit board; the lithium battery powers the integrated circuit board; the microphone is disposed in the hearing aid housing for picking up sound; the speaker is connected to the hearing aid housing and connected to the positive sound amplifier terminal SPK+ and the negative sound amplifier terminal SPK- of the sound amplifier circuit; the hearing aid is also provided with a rechargeable port for connecting to the positive charging contact ch+ and the negative charging contact ch- on the integrated circuit board and charging the lithium battery; the hearing aid can effectively reduce the power consumption of the circuit and improve the overall circuit efficiency by using a low-power hearing aid circuit.

[0111] The serial numbers of the utility model embodiments are only for description and do not represent the advantages and disadvantages of the embodiments. The above are only preferred embodiments of the utility model, and do not limit the patent scope of the invention. Any equivalent device or equivalent process transformation made by using the contents of the utility model specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the utility model.

Claims

1. A low power hearing aid circuit, characterized in that: Including main control chip (U1), sound pickup circuit, sound playback circuit, power supply circuit; The main control chip (U1) is provided with a sound pickup terminal, a sound amplification terminal, and a first power input terminal, the sound pickup terminal is connected to the sound pickup circuit, and the sound amplification terminal is connected to the sound amplification circuit; The power supply circuit comprises a power supply chip (U2), the first power input terminal of the power supply chip (U2) is connected to the battery power terminal, and the first power output terminal of the power supply chip (U2) is connected to the hearing aid power terminal of the main control chip (U1); the power supply chip (U2) is provided with an adjustment terminal, and the adjustment terminal is connected to a first resistor (R1) to step down the battery power and output it to the main control chip (U1) for power supply.

2. A low power hearing aid circuit according to claim 1, characterized in that: The power supply circuit further comprises a first inductor (L1), a first capacitor (C1), a second capacitor (C2), and a third capacitor (C3); the first capacitor (C1) is connected to the first power input terminal; the switch control terminal of the power supply chip (U2) is connected to the first inductor (L1); the other end of the first inductor (L1) is connected to the first power output terminal of the power supply chip (U2), the second capacitor (C2), and the third capacitor (C3) to output a step-down power supply; The other ends of the first capacitor (C1), the second capacitor (C2) and the third capacitor (C3) are grounded; The power supply chip (U2) is also provided with an enabling terminal connected to the main control chip (U1).

3. The low power hearing aid circuit according to claim 1, characterized in that: The pickup circuit comprises a pickup chip (U3), a second resistor (R2), a third resistor (R3), a fourth capacitor (C4), and a fifth capacitor (C5); The sound pickup chip (U3) is provided with a clock input terminal, a data output terminal, and a second power supply input terminal; the clock input terminal and the data output terminal are respectively connected to the sound pickup terminal of the main control chip (U1); the second resistor (R2) and the fourth capacitor (C4) are connected to the second power supply input terminal; the third resistor (R3) and the fifth capacitor (C5) are connected to the data output terminal; The other ends of the second resistor (R2), the third resistor (R3), the fourth capacitor (C4) and the fifth capacitor (C5) are grounded.

4. The low power hearing aid circuit according to claim 1, characterized in that: The audio amplifier circuit comprises a fourth resistor (R4), a fifth resistor (R5), a sixth resistor (R6), a seventh resistor (R7), and a sixth capacitor (C6), and the audio amplifier terminal comprises a positive audio amplifier terminal (SPK+) and a negative audio amplifier terminal (SPK-); One end of the fourth resistor (R4) is connected to the positive sound amplification end (SPK+), the other end of the fourth resistor (R4) is connected to the fifth resistor (R5) and the sixth capacitor (C6), and the other end of the fifth resistor (R5) is connected to the positive electrode of the speaker; One end of the sixth resistor (R6) is connected to the negative sound amplification end (SPK-), the other end of the sixth resistor (R6) is connected to the seventh resistor (R7) and the sixth capacitor (C6), and the other end of the seventh resistor (R7) is connected to the negative pole of the speaker.

5. The low power hearing aid circuit according to claim 1, characterized in that: It also includes a Hall switch circuit, which includes a switch chip (U4), a seventh capacitor (C7), an eighth resistor (R8), and a ninth resistor (R9); The third power input terminal of the switch chip (U4) is connected to the battery power supply and the seventh capacitor (C7), and the switch voltage output terminal of the switch chip (U4) is connected to the box entry detection terminal of the main control chip (U1) and the ninth resistor (R9) through the eighth resistor (R8); The other ends of the seventh capacitor (C7) and the ninth resistor (R9) are grounded.

6. The low power hearing aid circuit according to claim 1, characterized in that: It also includes a charging circuit, which includes a charging chip (U5), an eighth capacitor (C8), a ninth capacitor (C9), a tenth resistor (R10), a positive charging contact (ch+), a negative charging contact (ch-), a first electrostatic tube (D1), and a tenth capacitor (C10); the charging chip (U5) includes a fourth power input terminal, a constant current terminal, a chip control terminal, and a charging terminal; The positive charging contact (ch+) is connected to the first electrostatic tube (D1), the eighth capacitor (C8), the ninth capacitor (C9), and the fourth power input terminal; the charging terminal is connected to the tenth capacitor (C10) and connected to the battery input terminal for charging; the constant current terminal is connected to the tenth resistor (R10); The eighth capacitor (C8), the ninth capacitor (C9), the tenth capacitor (C10), the tenth resistor (R10), the first electrostatic tube (D1), and the negative charging contact (ch-) are grounded.

7. The low power hearing aid circuit according to claim 1, characterized in that: It also includes a battery protection circuit, the battery protection circuit includes a battery protection chip (U6), an eleventh resistor (R11), a twelfth resistor (R12), a thirteenth resistor (R13), and an eleventh capacitor (C11); the battery protection chip (U6) includes a fifth power input terminal, a load negative terminal, and a shipping reset terminal; The battery protection chip (U6) is connected to the eleventh resistor (R11), and the eleventh resistor (R11) is connected to the fifth power input terminal and the eleventh capacitor (C11); the shipping reset terminal is connected to the twelfth resistor (R12) and connected to the shipping control terminal of the main control chip (U1) and the thirteenth resistor (R13); The eleventh resistor (R11), the twelfth resistor (R12), the thirteenth resistor (R13), the eleventh capacitor (C11), and the negative terminal of the load are grounded.

8. The low power hearing aid circuit according to claim 1, characterized in that: It also includes a Bluetooth antenna circuit, which includes a twelfth capacitor (C12), a thirteenth capacitor (C13), a fourteenth resistor (R14), a second electrostatic tube (D2), and an antenna; The antenna end of the main control chip (U1) is connected to the twelfth capacitor (C12) and the fourteenth resistor (R14), and the other end of the fourteenth resistor (R14) is connected to the thirteenth capacitor (C13), the second electrostatic tube (D2), and the antenna; The twelfth capacitor (C12), the thirteenth capacitor (C13), and the second electrostatic tube (D2) are grounded.

9. The low power hearing aid circuit according to claim 1, characterized in that: The main control chip (U1) is also provided with a test terminal and a burning terminal; the main control chip (U1) is connected to an external test device via the test terminal and the burning terminal.

10. A hearing aid, characterized in that: A low-power hearing aid circuit comprising any one of claims 1-9.

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