A wireless microphone circuit

Abstract

The utility model provides a wireless microphone circuit, including transmitting circuit, battery circuit, audio input circuit, infrared receiving circuit and antenna L3, wherein, transmitting circuit includes transmitting chip U1, the output of battery circuit is connected with transmitting circuit, the output of audio input circuit is connected with transmitting circuit, the output of infrared receiving circuit is connected with transmitting circuit, the output of transmitting circuit is connected with antenna L3. Through U section transmitting chip as wireless U section signal emission main body emits the information containing audio data, simultaneously as the form control other peripherals of MCU main control, simultaneously with single lithium protection circuit, has overcharge, overdischarge, power short circuit protection function, integrates the setting commonly used function, thereby simple and integrated realization microphone basic function.

Description

Technical Field

[0001] This utility model relates to the field of microphone technology, and in particular to a wireless microphone circuit. Background Technology

[0002] In the field of digital UHF wireless microphones, transmitters, as handheld devices, often need to have as simple a circuit as possible to minimize the circuit board size, thus allowing for a smaller device design. In practical applications, designing a UHF microphone often requires consideration of peripherals such as power supply, MCU, charging IC, screen, infrared, and RF IC. The overall system is quite complex, with low integration and a bulky, cumbersome structure. Therefore, a lightweight and simple microphone design is currently needed. Utility Model Content

[0003] To address the aforementioned issues, this invention provides a wireless microphone circuit that integrates an audio receiving and transmitting module, as well as a charging and charging protection module, to meet conventional functions on the market while maintaining a simple overall circuit and low cost.

[0004] To achieve the above objectives, this utility model provides the following solution:

[0005] A wireless microphone circuit includes: a transmitting circuit, a battery circuit, an audio input circuit, an infrared receiving circuit, and an antenna L3. The transmitting circuit includes a transmitting chip U1. The output terminal of the battery circuit is connected to the transmitting circuit. The output terminal of the audio input circuit is connected to the transmitting circuit. The output terminal of the infrared receiving circuit is connected to the transmitting circuit. The output terminal of the transmitting circuit is connected to the antenna L3.

[0006] Further, the transmitting circuit includes: resistor R1, capacitors C2, C3, C4, C5, C6, C8, C9, C26, C27, inductor L1, inductor L2, and crystal oscillator X1. The second pin of the transmitting chip U1 is connected to one end of capacitor C2. The other end of capacitor C2 is connected to one end of capacitor C4 and one end of inductor L2. The other end of capacitor C4 is grounded. The third pin of the transmitting chip U1 is connected to one end of capacitor C3. The other end of capacitor C3 is connected to one end of inductor L1 and one end of capacitor C5. The other end of inductor L1 is grounded. The other end of capacitor C5 is connected to one end of capacitor C6. The other end of L2 is connected between capacitors C5 and C6. The other end of capacitor C6 is connected to one end of capacitor C8 and one end of resistor R1. The other end of capacitor C8 is grounded. The other end of resistor R1 is connected to one end of capacitor C9 and antenna L3. The other end of capacitor C9 is grounded. Crystal oscillator X1 has four pins. The first pin of crystal oscillator X1 is connected to the 29th pin of transmitter chip U1 and one end of capacitor C27. The other end of capacitor C27 is grounded. The second pin of crystal oscillator X1 is grounded. The third pin of crystal oscillator X1 is connected to the 30th pin of transmitter chip U1 and one end of capacitor C26. The other end of capacitor C26 is grounded. The fourth pin of crystal oscillator X1 is grounded.

[0007] Furthermore, the power supply circuit includes a charging interface, a battery charging circuit, a battery protection circuit, and a power on / off circuit. The output terminal of the charging interface is connected to the input terminal of the battery charging circuit, the output terminal of the battery charging circuit is connected to the input terminal of the battery protection circuit, and the output terminal of the battery protection circuit is connected to the power on / off circuit.

[0008] Furthermore, the battery protection circuit includes a lithium battery protection chip U2, a battery B1, a capacitor C23, and an inductor L5. The lithium battery protection chip U2 has three pins. The first pin of the lithium battery protection chip U2 is grounded. The third pin of the lithium battery protection chip U2 is connected to one end of the capacitor C23 and the negative terminal of the battery B1. The second pin of the lithium battery protection chip U2 and the other end of the capacitor C23 are both connected to one end of the inductor L5. The positive terminal of the battery B1 and the other end of the inductor L5 are both connected to the positive terminal of the power supply.

[0009] Furthermore, the battery charging circuit includes a charging chip U3, a resistor R11, a capacitor C28, a capacitor C29, a capacitor C30, and a capacitor C31. The charging chip U3 has six pins. The second pin of the charging chip U3 is grounded. The third pin of the charging chip U3 is connected to one end of capacitor C30, one end of capacitor C31, and the positive terminal of the power supply, respectively. The other ends of capacitor C30 and capacitor C31 are grounded. The fourth pin of the charging chip U3 is connected to one end of capacitor C28 and the bus power supply, respectively. The other end of capacitor C28 is grounded. The capacitor C29 is connected in parallel across capacitor C28.

[0010] Furthermore, the power-on / off circuit includes resistors R12, R13, R14, R15, R16, R17, R18, R19, R20, and R21; capacitors C32, C33, C34, C35, and C36; button K2; transistor Q1; MOSFET Q2; diodes D1, D2, TVS diode D4, and D5.

[0011] In this configuration, one end of TVS diode D4 is connected to the microcontroller's voltage source, and the other end of TVS diode D4 is grounded. The grounded end of TVS diode D4 is connected to one end of capacitor C32, and the other end of capacitor C32 is also connected to the microcontroller's voltage source. The drain of MOSFET Q2 is connected to the microcontroller's voltage source, and the source of MOSFET Q2 is connected to the collector of transistor Q1. The gate of MOSFET Q2 is connected to the positive terminal of the power supply, one end of resistor R12, and one end of capacitor C33. The other end of resistor R12 is connected to the collector of transistor Q1, and the other end of capacitor C33 is also connected to the collector of transistor Q1. The emitter of transistor Q1 is grounded. One end of resistor R13 is connected to the base of transistor Q1 and one end of resistor R17, and the other end of resistor R13 is grounded. One end of resistor R17 is connected to the cathode of diode D5 and the cathode of diode D2, and the other end of resistor R17 is connected to the cathode of diode D5. The negative terminal of diode D1 is connected to the ground. The positive terminal of diode D1 is connected to one end of resistor R18 and pin 18 of transmitter chip U1. The other end of resistor R18 is connected to a positive voltage source. The positive terminal of diode D5 is connected to one end of resistor R16. The other end of resistor R16 is connected to one end of capacitor C34, one end of resistor R14, and one end of button K2. The other end of capacitor C34 is grounded. The other end of button K2 is connected to the positive terminal of the power supply. The other end of resistor R14 is connected to one end of resistor R15 and pin 26 of transmitter chip U1. The other end of resistor R15 is grounded. Capacitor C35 is connected in parallel across resistor R15. The positive terminal of diode D2 is connected to one end of resistor R19, one end of resistor R20, and pin 21 of transmitter chip U1. Capacitor C36 is connected in parallel across resistor R20. Resistor R21 is connected in parallel across resistor R19. The other end of resistor R19 is connected to the bus power supply.

[0012] Furthermore, the infrared receiving circuit includes an infrared receiver head U5, resistors R24 and R25, and capacitor C37. The infrared receiver head U5 has four pins. Pins 1 and 4 of the infrared receiver head U5 are grounded. Pin 2 of the infrared receiver head U5 is connected to one end of resistor R25. The other end of resistor R25 is connected to one end of resistor R24, one end of capacitor C37, and a positive voltage source. Pin 3 of the infrared receiver head U5 is connected to pin 25 of the transmitting chip U1. The other end of capacitor C37 is grounded, and the other end of resistor R24 ​​is connected to pin 25 of the transmitting chip U1.

[0013] Furthermore, the charging interface is a Type-C interface.

[0014] Furthermore, it also includes a power acquisition circuit, a display screen, and a button circuit.

[0015] Furthermore, the input terminal of the power acquisition circuit is connected to the output terminal of the battery protection circuit, the output terminal of the power acquisition circuit is connected to pin 17 of the transmitter chip U1, the output terminal of the button circuit is connected to the input terminal of the transmitter circuit, and the input terminal of the display screen is connected to the output terminal of the transmitter circuit.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model uses a U-band transmitter chip as the main body for transmitting wireless U-band signals to transmit information containing audio data. At the same time, it controls other peripherals in the form of an MCU master controller. It also has a single-cell lithium battery protection circuit, with overcharge, over-discharge, and power supply short circuit protection functions. It integrates commonly used functions, thereby simplifying and integrating the basic functions of the microphone. Attached Figure Description

[0017] Figure 1 This is a connection block diagram of a wireless microphone circuit.

[0018] Figure 2 This is a circuit diagram of the transmitting circuit in a wireless microphone circuit.

[0019] Figure 3 This is a circuit diagram of a charging protection circuit in a wireless microphone circuit.

[0020] Figure 4 This is a circuit diagram of the charging circuit in a wireless microphone circuit.

[0021] Figure 5 This is a circuit diagram of the power-on / off circuit in a wireless microphone circuit.

[0022] Figure 6 This is a circuit diagram of the infrared receiving circuit in a wireless microphone circuit. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] like Figure 1As shown, a wireless microphone circuit includes: a transmitting circuit, a battery circuit, an audio input circuit, an infrared receiving circuit, and an antenna L3. The transmitting circuit includes a transmitting chip U1. The output terminal of the battery circuit is connected to the transmitting circuit, the output terminal of the audio input circuit is connected to the transmitting circuit, the output terminal of the infrared receiving circuit is connected to the transmitting circuit, and the output terminal of the transmitting circuit is connected to the antenna L3.

[0026] The audio input circuit is used to receive audio signals from the microphone and send them to the transmitting circuit for processing.

[0027] like Figure 2 As shown, in an optional embodiment, the transmitting circuit includes: resistor R1, capacitors C2, C3, C4, C5, C6, C8, C9, C26, C27, inductor L1, inductor L2, and crystal oscillator X1. The second pin of the transmitting chip U1 is connected to one end of capacitor C2. The other end of capacitor C2 is connected to one end of capacitor C4 and one end of inductor L2, respectively. The other end of capacitor C4 is grounded. The third pin of the transmitting chip U1 is connected to one end of capacitor C3. The other end of capacitor C3 is connected to one end of inductor L1 and one end of capacitor C5, respectively. The other end of inductor L1 is grounded. The other end of capacitor C5 is connected to one end of capacitor C6. The other end of inductor L2 is connected between capacitors C5 and C6. The other end of capacitor C6 is connected to one end of capacitor C8 and one end of resistor R1. The other end of capacitor C8 is grounded. The other end of resistor R1 is connected to one end of capacitor C9 and antenna L3. The other end of capacitor C9 is grounded. Crystal oscillator X1 has four pins. The first pin of crystal oscillator X1 is connected to the 29th pin of transmitter chip U1 and one end of capacitor C27. The other end of capacitor C27 is grounded. The second pin of crystal oscillator X1 is grounded. The third pin of crystal oscillator X1 is connected to the 30th pin of transmitter chip U1 and one end of capacitor C26. The other end of capacitor C26 is grounded. The fourth pin of crystal oscillator X1 is grounded.

[0028] Specifically, the transmitter chip U1 is model U1T32A, which is a UHF transmitter chip. The transmitter chip U1 has 32 pins, of which pin 2 is the N-terminal output of the RF power amplifier, pin 3 is the P-terminal output of the RF power amplifier, pin 29 is the output of the 24.576MHz crystal oscillator, and pin 30 is the input of the 24.576MHz crystal oscillator. The transmitter chip U1 acts as the main transmitter of wireless UHF signals, transmitting information containing audio data. At the same time, it acts as the MCU master controller to control other peripherals. As a single-chip solution integrating a 32-bit RISC MCU core and UHF RF functions, the U1T32A's design not only includes timers, SAR-ADC (successive approximation analog-to-digital converter), and rich peripheral interfaces, but also supports touch screen and button operation functions.

[0029] In an optional embodiment, the power supply circuit includes a charging interface, a battery charging circuit, a battery protection circuit, and a power on / off circuit, wherein the output terminal of the charging interface is connected to the input terminal of the battery charging circuit, the output terminal of the battery charging circuit is connected to the input terminal of the battery protection circuit, and the output terminal of the battery protection circuit is connected to the power on / off circuit.

[0030] like Figure 3 As shown, in an optional embodiment, the battery protection circuit includes a lithium battery protection chip U2, a battery B1, a capacitor C23, and an inductor L5. The lithium battery protection chip U2 has three pins. The first pin of the lithium battery protection chip U2 is grounded. The third pin of the lithium battery protection chip U2 is connected to one end of the capacitor C23 and the negative terminal of the battery B1. The second pin of the lithium battery protection chip U2 and the other end of the capacitor C23 are both connected to one end of the inductor L5. The positive terminal of the battery B1 and the other end of the inductor L5 are both connected to the positive terminal of the power supply.

[0031] Specifically, the lithium battery protection chip U2 is model XB3303A. The core function of the battery protection circuit is to monitor the battery's voltage, current, and temperature, and promptly cut off the charging and discharging circuit when abnormal conditions occur, so as to avoid battery damage or safety problems. The XB3303A chip is an integrated solution for this type of protection circuit.

[0032] like Figure 4 As shown, in an optional embodiment, the battery charging circuit includes a charging chip U3, a resistor R11, a capacitor C28, a capacitor C29, a capacitor C30, and a capacitor C31. The charging chip U3 has six pins. The second pin of the charging chip U3 is grounded. The third pin of the charging chip U3 is connected to one end of capacitor C30, one end of capacitor C31, and the positive terminal of the power supply, respectively. The other ends of capacitor C30 and capacitor C31 are grounded. The fourth pin of the charging chip U3 is connected to one end of capacitor C28 and the bus power supply, respectively. The other end of capacitor C28 is grounded. The capacitor C29 is connected in parallel across capacitor C28.

[0033] Specifically, the charging chip U3 is model LP4069B6F, which is a constant current and constant voltage linear charger for a single lithium-ion battery. It integrates a MOSFET and uses thermal feedback to regulate the charging current to limit the chip temperature under high power or high ambient temperature conditions. The charging voltage is fixed at 4.2V, and the charging current is set through an external resistor.

[0034] like Figure 5As shown, in an optional embodiment, the power-on / off circuit includes resistors R12, R13, R14, R15, R16, R17, R18, R19, R20, and R21; capacitors C32, C33, C34, C35, and C36; button K2; transistor Q1; MOSFET Q2; diodes D1, D2, TVS diode D4, and D5.

[0035] In this configuration, one end of TVS diode D4 is connected to the microcontroller's voltage source, and the other end of TVS diode D4 is grounded. The grounded end of TVS diode D4 is connected to one end of capacitor C32, and the other end of capacitor C32 is also connected to the microcontroller's voltage source. The drain of MOSFET Q2 is connected to the microcontroller's voltage source, and the source of MOSFET Q2 is connected to the collector of transistor Q1. The gate of MOSFET Q2 is connected to the positive terminal of the power supply, one end of resistor R12, and one end of capacitor C33. The other end of resistor R12 is connected to the collector of transistor Q1, and the other end of capacitor C33 is also connected to the collector of transistor Q1. The emitter of transistor Q1 is grounded. One end of resistor R13 is connected to the base of transistor Q1 and one end of resistor R17, and the other end of resistor R13 is grounded. One end of resistor R17 is connected to the cathode of diode D5 and the cathode of diode D2, and the other end of resistor R17 is connected to the cathode of diode D5. The negative terminal of diode D1 is connected to the ground. The positive terminal of diode D1 is connected to one end of resistor R18 and pin 18 of transmitter chip U1. The other end of resistor R18 is connected to a positive voltage source. The positive terminal of diode D5 is connected to one end of resistor R16. The other end of resistor R16 is connected to one end of capacitor C34, one end of resistor R14, and one end of button K2. The other end of capacitor C34 is grounded. The other end of button K2 is connected to the positive terminal of the power supply. The other end of resistor R14 is connected to one end of resistor R15 and pin 26 of transmitter chip U1. The other end of resistor R15 is grounded. Capacitor C35 is connected in parallel across resistor R15. The positive terminal of diode D2 is connected to one end of resistor R19, one end of resistor R20, and pin 21 of transmitter chip U1. Capacitor C36 is connected in parallel across resistor R20. Resistor R21 is connected in parallel across resistor R19. The other end of resistor R19 is connected to the bus power supply.

[0036] The power-on / off circuit achieves power-on and power-off functions through a long press operation in conjunction with the U-band transmitter chip, while also satisfying basic button press detection and Type-C interface power supply access detection.

[0037] like Figure 6As shown, in an optional embodiment, the infrared receiving circuit includes an infrared receiver head U5, resistors R24 and R25, and capacitor C37. The infrared receiver head U5 has four pins. Pins 1 and 4 of the infrared receiver head U5 are grounded. Pin 2 of the infrared receiver head U5 is connected to one end of resistor R25. The other end of resistor R25 is connected to one end of resistor R24, one end of capacitor C37, and a positive voltage source. Pin 3 of the infrared receiver head U5 is connected to pin 25 of the transmitting chip U1. The other end of capacitor C37 is grounded, and the other end of resistor R24 ​​is connected to pin 25 of the transmitting chip U1.

[0038] The infrared receiver U5, model IRM-V840C / TR1, integrates a PIN diode and a preamplifier, enabling it to effectively receive infrared light and possess excellent electromagnetic interference resistance.

[0039] In an optional embodiment, the charging interface is a Type-C interface. The Type-C interface is used to supply power to charge the lithium battery, and also has USB access capabilities, which can be used for information printing and firmware upgrades.

[0040] In an optional embodiment, it also includes a power acquisition circuit, a display screen, and a button circuit.

[0041] In an optional embodiment, the input terminal of the power acquisition circuit is connected to the output terminal of the battery protection circuit, the output terminal of the power acquisition circuit is connected to pin 17 of the transmitter chip U1, the output terminal of the button circuit is connected to the input terminal of the transmitter circuit, and the input terminal of the display screen is connected to the output terminal of the transmitter circuit.

[0042] The working principle of this utility model is as follows: the U-band transmitter chip, as the main body for transmitting wireless U-band signals, emits information containing audio data. At the same time, it controls other peripherals in the form of an MCU master controller. The power-on and power-off circuit, in conjunction with the U-band transmitter chip, realizes the power-on and power-off functions by long-press operation. It also meets the basic functions of button press detection and Type-C interface power supply access detection. When a button in the button circuit is pressed, a level change is generated. The change signal is detected by the U-band transmitter chip. Different buttons are used to process different button command information. The display content is controlled by the U-band transmitter chip and can display the current device information and information that needs to be adjusted or changed. Type-C: The Type-C interface is used to power and charge the lithium battery. It also has a USB port for data printing and firmware upgrades. The battery charging circuit is primarily used to charge the lithium battery. ADC (Analog-to-Digital Converter) power acquisition: This displays the remaining battery power in real-time on the screen. Battery protection circuit: This prevents damage caused by reverse battery connection and includes single-cell lithium battery protection with overcharge, over-discharge, and short-circuit protection. Infrared receiver circuit: This receives infrared information and adjusts the handheld microphone frequency. Audio input circuit: This connects to the microphone core to collect audio signals for processing by the UHF transmitter chip. This design fulfills the basic functional requirements of a standard UHF microphone.

[0043] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0044] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A wireless microphone circuit, characterized in that, include: The system includes a transmitting circuit, a battery circuit, an audio input circuit, an infrared receiving circuit, and an antenna L3. The transmitting circuit includes a transmitting chip U1. The output terminal of the battery circuit is connected to the transmitting circuit. The output terminal of the audio input circuit is connected to the transmitting circuit. The output terminal of the infrared receiving circuit is connected to the transmitting circuit. The output terminal of the transmitting circuit is connected to the antenna L3.

2. The wireless microphone circuit according to claim 1, characterized in that: The transmitting circuit includes: resistor R1, capacitors C2, C3, C4, C5, C6, C8, C9, C26, C27, inductor L1, inductor L2, and crystal oscillator X1. Pin 2 of the transmitting chip U1 is connected to one end of capacitor C2. The other end of capacitor C2 is connected to one end of capacitor C4 and one end of inductor L2. The other end of capacitor C4 is grounded. Pin 3 of the transmitting chip U1 is connected to one end of capacitor C3. The other end of capacitor C3 is connected to one end of inductor L1 and one end of capacitor C5. The other end of inductor L1 is grounded. The other end of capacitor C5 is connected to one end of capacitor C6. The crystal oscillator X1... The other end is connected between capacitors C5 and C6. The other end of capacitor C6 is connected to one end of capacitor C8 and one end of resistor R1. The other end of capacitor C8 is grounded. The other end of resistor R1 is connected to one end of capacitor C9 and antenna L3. The other end of capacitor C9 is grounded. Crystal oscillator X1 has four pins. The first pin of crystal oscillator X1 is connected to the 29th pin of transmitter chip U1 and one end of capacitor C27. The other end of capacitor C27 is grounded. The second pin of crystal oscillator X1 is grounded. The third pin of crystal oscillator X1 is connected to the 30th pin of transmitter chip U1 and one end of capacitor C26. The other end of capacitor C26 is grounded. The fourth pin of crystal oscillator X1 is grounded.

3. A wireless microphone circuit according to claim 2, characterized in that: The power supply circuit includes a charging interface, a battery charging circuit, a battery protection circuit, and a power on / off circuit. The output terminal of the charging interface is connected to the input terminal of the battery charging circuit, the output terminal of the battery charging circuit is connected to the input terminal of the battery protection circuit, and the output terminal of the battery protection circuit is connected to the power on / off circuit.

4. A wireless microphone circuit according to claim 3, characterized in that: The battery protection circuit includes a lithium battery protection chip U2, a battery B1, a capacitor C23, and an inductor L5. The lithium battery protection chip U2 has three pins. The first pin of the lithium battery protection chip U2 is grounded. The third pin of the lithium battery protection chip U2 is connected to one end of the capacitor C23 and the negative terminal of the battery B1. The second pin of the lithium battery protection chip U2 and the other end of the capacitor C23 are both connected to one end of the inductor L5. The positive terminal of the battery B1 and the other end of the inductor L5 are both connected to the positive terminal of the power supply.

5. A wireless microphone circuit according to claim 3, characterized in that: The battery charging circuit includes a charging chip U3, a resistor R11, capacitors C28, C29, C30, and C31. The charging chip U3 has six pins. The second pin of the charging chip U3 is grounded. The third pin of the charging chip U3 is connected to one end of capacitor C30, one end of capacitor C31, and the positive terminal of the power supply, respectively. The other ends of capacitors C30 and C31 are grounded. The fourth pin of the charging chip U3 is connected to one end of capacitor C28 and the bus power supply, respectively. The other end of capacitor C28 is grounded. Capacitor C29 is connected in parallel across capacitor C28.

6. A wireless microphone circuit according to claim 3, characterized in that: The power-on / off circuit includes resistors R12, R13, R14, R15, R16, R17, R18, R19, R20, and R21; capacitors C32, C33, C34, C35, and C36; button K2; transistor Q1; MOSFET Q2; diodes D1, D2, TVS diode D4, and D5. In this configuration, one end of TVS diode D4 is connected to the microcontroller's voltage source, and the other end of TVS diode D4 is grounded. The grounded end of TVS diode D4 is connected to one end of capacitor C32, and the other end of capacitor C32 is also connected to the microcontroller's voltage source. The drain of MOSFET Q2 is connected to the microcontroller's voltage source, and the source of MOSFET Q2 is connected to the collector of transistor Q1. The gate of MOSFET Q2 is connected to the positive terminal of the power supply, one end of resistor R12, and one end of capacitor C33. The other end of resistor R12 is connected to the collector of transistor Q1, and the other end of capacitor C33 is also connected to the collector of transistor Q1. The emitter of transistor Q1 is grounded. One end of resistor R13 is connected to the base of transistor Q1 and one end of resistor R17, and the other end of resistor R13 is grounded. One end of resistor R17 is connected to the cathode of diode D5 and the cathode of diode D2, and the other end of resistor R17 is connected to the cathode of diode D5. The negative terminal of diode D1 is connected to the ground. The positive terminal of diode D1 is connected to one end of resistor R18 and pin 18 of transmitter chip U1. The other end of resistor R18 is connected to a positive voltage source. The positive terminal of diode D5 is connected to one end of resistor R16. The other end of resistor R16 is connected to one end of capacitor C34, one end of resistor R14, and one end of button K2. The other end of capacitor C34 is grounded. The other end of button K2 is connected to the positive terminal of the power supply. The other end of resistor R14 is connected to one end of resistor R15 and pin 26 of transmitter chip U1. The other end of resistor R15 is grounded. Capacitor C35 is connected in parallel across resistor R15. The positive terminal of diode D2 is connected to one end of resistor R19, one end of resistor R20, and pin 21 of transmitter chip U1. Capacitor C36 is connected in parallel across resistor R20. Resistor R21 is connected in parallel across resistor R19. The other end of resistor R19 is connected to the bus power supply.

7. A wireless microphone circuit according to claim 2, characterized in that: The infrared receiving circuit includes an infrared receiver head U5, resistors R24 and R25, and capacitor C37. The infrared receiver head U5 has four pins. Pins 1 and 4 of the infrared receiver head U5 are grounded. Pin 2 of the infrared receiver head U5 is connected to one end of resistor R25. The other end of resistor R25 is connected to one end of resistor R24, one end of capacitor C37, and a positive voltage source. Pin 3 of the infrared receiver head U5 is connected to pin 25 of the transmitting chip U1. The other end of capacitor C37 is grounded, and the other end of resistor R24 ​​is connected to pin 25 of the transmitting chip U1.

8. A wireless microphone circuit according to claim 3, characterized in that, The charging interface is a Type-C interface.

9. A wireless microphone circuit according to claim 2, characterized in that, It also includes a power acquisition circuit, a display screen, and a button circuit.

10. A wireless microphone circuit according to claim 9, characterized in that: The input terminal of the power acquisition circuit is connected to the output terminal of the battery protection circuit, the output terminal of the power acquisition circuit is connected to pin 17 of the transmitter chip U1, the output terminal of the button circuit is connected to the input terminal of the transmitter circuit, and the input terminal of the display screen is connected to the output terminal of the transmitter circuit.

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