Wireless microphone light energy charging box

Abstract

The utility model provides a wireless microphone light energy charging box, including upper casing and lower casing, the outer surface of upper casing is equipped with an installation cavity, installs solar cell panel in installation cavity, is equipped with charging cavity in lower casing, is equipped with charging circuit board below charging cavity, charging circuit board and solar cell panel electricity is connected, the bottom of charging cavity is equipped with spring needle, spring needle and wireless microphone electricity is connected, provides stable power supply for wireless microphone, charging circuit board includes first order voltage reduction and maximum power point tracking circuit, electric quantity state display circuit and voltage current regulation circuit, first order voltage reduction and maximum power point tracking circuit jointly converts the high voltage output of solar cell panel into low voltage direct current required by wireless microphone charging, and keeps maximum power work, electric quantity state display circuit is used for feedback charging electric quantity, voltage current regulation circuit is used for accurate regulation charging voltage and current, through the utility model, can realize the outdoor light of wireless microphone charging box charges the continuation of navigation.

Description

Technical Field

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

[0002] With the booming development of audio and video content production industries such as short video creation, live streaming e-commerce, and outdoor interviews, wireless microphones have become indispensable equipment for content creators due to their advantages of freeing them from cables and providing pure audio. Wireless microphones typically come with a portable charging case, whose core functions are to protect the microphone during storage and charge its built-in battery, ensuring the device is always ready to use.

[0003] Currently, most wireless microphone charging cases on the market rely on wired power sources, such as chargers, power banks, or computers connected via USB. While this traditional charging method is mature and reliable, it reveals significant shortcomings in outdoor, mobile, or emergency use scenarios. When users are in environments lacking a stable mains power supply, such as outdoor shooting, travel vlog recording, or breaking news reporting, once the charging case runs out of power, both the case itself and the wireless microphone inside will cease to function, severely impacting creative continuity and equipment reliability, and failing to meet the outdoor shooting needs of wireless microphones. Utility Model Content

[0004] The purpose of this utility model is to provide a wireless microphone optical charging box, which aims to solve the problem that existing charging boxes cannot meet the outdoor shooting needs of wireless microphones, and realize the outdoor optical charging life of the wireless microphone charging box.

[0005] To achieve the above objectives, this utility model provides a wireless microphone solar charging box, comprising an upper shell and a lower shell. The outer surface of the upper shell has a mounting cavity, within which a solar panel is mounted. The lower shell contains a charging cavity, below which a charging circuit board is located, electrically connected to the solar panel. The charging circuit board has a spring-loaded pin, electrically connected to the wireless microphone, providing a stable power supply. The charging circuit board includes a first-order buck converter and maximum power point tracking circuit, a second-order buck converter and maximum power point tracking circuit, a power status display circuit, and a voltage and current adjustment circuit, wherein: The first-order buck and maximum power point tracking circuit is connected to the solar panel to convert the high-voltage output of the solar panel into a stable low-voltage output and to initially adjust the power operating point of the solar panel. The second-order buck and maximum power point tracking circuit is connected to the first-order buck and maximum power point tracking circuit to convert the stable low-voltage output into the low-voltage DC power required for charging the wireless microphone and to keep the solar panel operating at maximum power. The power status display circuit is used to provide feedback on the current charging power of the wireless microphone; The voltage and current regulation circuit is used to precisely regulate the charging voltage and current of the wireless microphone.

[0006] As an optional embodiment of this utility model, the first-order buck and maximum power point tracking circuit includes a first electrostatic discharge diode, a second electrostatic discharge diode, a fourth capacitor, a seventh capacitor, a ninth capacitor, a tenth capacitor, a sixteenth capacitor, a seventeenth capacitor, a first inductor, a synchronous buck converter, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a first field-effect transistor, and a second Zener diode, wherein: The positive input of the solar panel is connected to the second terminal of the second electrostatic discharge diode, the first terminal of the seventh capacitor, the first terminal of the tenth capacitor, the first terminal of the eleventh resistor, the first terminal of the fifteenth resistor, and the power input pin of the synchronous buck converter; the second terminal of the eleventh resistor is connected to the first terminal of the tenth resistor and the enable pin of the synchronous buck converter; the second terminal of the fifteenth resistor is connected to the cathode of the second Zener diode; the anode of the second Zener diode is connected to the first terminal of the fourteenth resistor and the gate of the first field-effect transistor; the feedback input pin of the synchronous buck converter is connected to the first terminal of the twelfth resistor, the first terminal of the sixteenth capacitor, and the first terminal of the ninth resistor; the second terminal of the sixteenth capacitor is connected to the second terminal of the ninth resistor, the first terminal of the fourth capacitor, the first terminal of the ninth capacitor, and the power input pin of the synchronous buck converter. The first terminal of an inductor is connected to the input terminal of the second-order buck and maximum power point tracking circuit; the second terminal of the first inductor is connected to the first terminal of the seventeenth capacitor and the switching pin of the synchronous buck converter; the second terminal of the seventeenth capacitor is connected to the bootstrap pin of the synchronous buck converter; the first terminal of the first electrostatic discharge diode, the source of the first field-effect transistor, the second terminal of the thirteenth resistor, the second terminal of the twelfth resistor, the second terminal of the fourth capacitor, and the second terminal of the ninth capacitor are grounded; the drain of the first field-effect transistor, the second terminal of the tenth resistor, the second terminal of the fourteenth resistor, the first terminal of the thirteenth resistor, the negative input of the solar panel, the second terminal of the first electrostatic discharge diode, the first terminal of the second electrostatic discharge diode, the second terminal of the seventh capacitor, and the second terminal of the tenth capacitor are connected to the ground terminal of the solar panel.

[0007] As an optional embodiment of this utility model, the second-order buck and maximum power point tracking circuit includes a fifth electrostatic discharge diode, a sixth electrostatic discharge diode, a surge protection diode, a first capacitor, a second capacitor, a third capacitor, a fifth capacitor, a sixth capacitor, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a second inductor, a twenty-third resistor, a wire-to-board connector, and a multi-functional power management chip, wherein: The input terminal of the second-order buck and maximum power point tracking circuit is connected to the first terminal of the sixth electrostatic discharge diode, the cathode of the surge protection diode, the first terminal of the third capacitor, the first terminal of the first capacitor, the system boost output terminal of the multi-functional power management chip, the input / output power supply pins of the multi-functional power management chip, and the first terminal of the thirteenth capacitor; the buck switch pin of the multi-functional power management chip is connected to the first terminal of the second inductor; the second terminal of the second inductor is connected to the first terminal of the twelfth capacitor, the first terminal of the fourteenth capacitor, the first terminal of the fifth capacitor, the cell detection pin of the multi-functional power management chip, the first terminal of the fifth electrostatic discharge diode, the cell power supply pin of the multi-functional power management chip, and the first terminal of the thirteenth capacitor. The first terminal of the sixth capacitor, the second pin of the wire-to-plate connector, and the first terminal of the second capacitor are connected; the third pin of the wire-to-plate connector is connected to the first terminal of the twentieth-third resistor; the second terminal of the twentieth-third resistor is connected to the first terminal of the NTC resistor; the second terminal of the sixth electrostatic discharge diode, the anode of the surge protection diode, the second terminal of the third capacitor, the second terminal of the first capacitor, the second terminal of the thirteenth capacitor, the second terminal of the twelfth capacitor, the second terminal of the fourteenth capacitor, the second terminal of the fifth electrostatic discharge diode, the second terminal of the fifth capacitor, the second terminal of the sixth capacitor, the second terminal of the second capacitor, the first pin of the wire-to-plate connector, the fourth pin of the wire-to-plate connector, and the second terminal of the NTC resistor are grounded.

[0008] As an optional embodiment of this utility model, the power status display circuit includes a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first light-emitting diode, a second light-emitting diode, a third light-emitting diode, and a fourth light-emitting diode, wherein: The first end of the second resistor is connected to the fifth general purpose input / output pin of the multi-functional power management chip; the second end of the second resistor is connected to the anode of the second light-emitting diode; the first end of the third resistor is connected to the fourth general purpose input / output pin of the multi-functional power management chip; the second end of the third resistor is connected to the anode of the first light-emitting diode; the first end of the fourth resistor is connected to the eighth general purpose input / output pin of the multi-functional power management chip; the second end of the fourth resistor is connected to the anode of the third light-emitting diode; the first end of the fifth resistor is connected to the ninth general purpose input / output pin of the multi-functional power management chip; the second end of the fifth resistor is connected to the anode of the fourth light-emitting diode; the cathodes of the first light-emitting diode, the second light-emitting diode, the third light-emitting diode, and the fourth light-emitting diode are grounded.

[0009] As an optional embodiment of this utility model, the voltage and current regulation circuit includes an eighth capacitor, a fifteenth capacitor, a first resistor, a fifteenth capacitor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, and a Hall sensor, wherein: The first terminal of the eighth capacitor is connected to the third general purpose input / output pin of the multi-functional power management chip; the first terminal of the sixteenth resistor is connected to the second general purpose input / output pin of the multi-functional power management chip; the first terminal of the twentieth resistor is connected to the first general purpose input / output pin of the multi-functional power management chip; the first terminal of the seventeenth resistor is connected to the zero general purpose input / output pin of the multi-functional power management chip; the first terminal of the eighteenth resistor is connected to the button drive pin of the multi-functional power management chip; the Hall switch input pin of the multi-functional power management chip is connected to the first terminals of the nineteenth, twenty-first, and twenty-second resistors; the output pin of the multi-functional power management chip is connected to the second terminal of the nineteenth resistor, the first terminal of the fifteenth capacitor, and the first terminal of the first resistor; the second terminal of the first resistor is connected to the power supply input terminal of the Hall sensor; the second terminal of the twenty-second resistor is connected to the output terminal of the Hall sensor; the second terminals of the eighth capacitor, the sixteenth resistor, the twentieth resistor, the seventeenth resistor, the eighteenth resistor, the fifteenth capacitor, and the twenty-first resistor are grounded.

[0010] As an optional embodiment of this utility model, the charging circuit board further includes a USB charging circuit, which includes a USB charging interface, a sixth resistor, a seventh resistor, and an eighth resistor, wherein: The power pin of the USB charging interface is connected to the first end of the sixth resistor; the second end of the sixth resistor is connected to the first end of the sixth electrostatic discharge diode; the first channel configuration pin of the USB charging interface is connected to the first end of the seventh resistor; the second channel configuration pin of the USB charging interface is connected to the first end of the eighth resistor; and the second end of the eighth resistor is grounded to the second end of the seventh resistor.

[0011] As an optional embodiment of this utility model, the charging circuit board further includes an electrostatic discharge (ESD) protection circuit, which includes a third ESD diode, a fourth ESD diode, and an eleventh capacitor, wherein: The first terminal of the third electrostatic discharge diode is connected to the first positive terminal of the microphone of the multi-functional power management chip and the first terminal of the eleventh capacitor; the first terminal of the fourth electrostatic discharge diode is connected to the second positive terminal of the microphone of the multi-functional power management chip; the second terminals of the third electrostatic discharge diode, the second terminals of the fourth electrostatic discharge diode, and the second terminal of the eleventh capacitor are grounded.

[0012] As an optional solution of this utility model, the lower housing is further provided with a receiving cavity for storing a mobile phone direct-plug receiver.

[0013] As an optional solution of this utility model, a storage battery is also provided below the charging cavity, the NTC resistor is located inside the storage battery to reflect the temperature change of the storage battery during charging, the anode of the storage battery is connected to the first terminal of the second capacitor, and the cathode of the storage battery is grounded.

[0014] As an optional solution of this utility model, the charging circuit board is provided with a flexible flat cable, which extends out from the lower housing and abuts against the solar panel to transfer the light energy received by the solar panel to the charging circuit board.

[0015] The above-mentioned technical solutions in the wireless microphone solar charging box provided by this utility model embodiment have at least one of the following technical effects: 1. By setting up a solar charging board and a USB charging port, a hybrid charging mode of "solar energy as the main source and electrical energy as the auxiliary source" is formed, which can adapt to the outdoor shooting environment requirements of wireless microphones.

[0016] 2. By setting up first- and second-order buck and maximum power point tracking circuits, the charging efficiency of solar panels can be significantly improved, enabling the solar panels to operate at maximum power.

[0017] 3. The charging cutoff voltage is set through a voltage and current adjustment circuit, and an opening detection unit is built with a Hall sensor as the core to sense the opening and closing status of the charging box in real time.

[0018] 4. The charging circuit board integrates comprehensive electrostatic protection measures, which can effectively resist electrostatic shocks generated during daily use and prevent product damage.

[0019] 5. By cascading an NTC resistor in the circuit to monitor the battery temperature in real time, the charging state can be disconnected when the battery is too cold or too hot, extending the battery's lifespan; by setting up a power status display circuit to clearly display the remaining power of the charging box, users can have a clear understanding of the device's status and improve the user experience. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is an exploded view of the structure of a wireless microphone solar charging box according to this utility model.

[0022] Figure 2 This is a circuit diagram of a first-order buck converter and maximum power point tracking circuit for a wireless microphone solar charging box according to this utility model.

[0023] Figure 3 This is a circuit diagram of a second-order buck and maximum power point tracking circuit, a power status display circuit, and a voltage and current adjustment circuit for a wireless microphone solar charging box according to this utility model.

[0024] 1. Upper housing; 2. Lower housing; 3. Solar panel; 4. Mobile phone direct-plug receiver; 5. Wireless microphone; 6. Charging circuit board; 7. Battery; 101. Mounting cavity; 201. Lower housing base; 202. Charging cavity; 203. Receiving cavity; 204. First through hole; 205. Second through hole; 601. Spring pin; 602. Flexible flat cable; 603. USB interface; ESD1. First electrostatic discharge diode; ESD2. Second electrostatic discharge diode; C4. Fourth capacitor; C7. Seventh capacitor; C9. Ninth capacitor; C10. Tenth capacitor Capacitors; C16, sixteenth capacitor; C17, seventeenth capacitor; L1, first inductor; U2, synchronous buck converter; R9, ninth resistor; R10, tenth resistor; R11, eleventh resistor; R12, twelfth resistor; R13, thirteenth resistor; R14, fourteenth resistor; R15, fifteenth resistor; Q1, first MOSFET; D2, second Zener diode; SLGND, solar panel ground terminal; ESD5, fifth electrostatic discharge diode; ESD6, sixth electrostatic discharge diode; D1, surge protection diode; C1, first... Capacitors; C2, second capacitor; C3, third capacitor; C5, fifth capacitor; C6, sixth capacitor; C12, twelfth capacitor; C13, thirteenth capacitor; C14, fourteenth capacitor; L2, second inductor; R22, twenty-third resistor; J5, wire-to-board pin header; U3, multi-functional power management chip; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; LED1, first light-emitting diode; LED2, second light-emitting diode; LED3, third light-emitting diode; LED4, fourth light-emitting diode; C8 8th capacitor; C15, 15th capacitor; R1, 1st resistor; C15, 15th capacitor; R16, 16th resistor; R17, 17th resistor; R18, 18th resistor; R19, 19th resistor; R20, 20th resistor; R21, 21st resistor; R22, 22nd resistor; U1, Hall sensor; USB1, USB charging interface; R6, 6th resistor; R7, 7th resistor; R8, 8th resistor; ESD3, 3rd electrostatic discharge diode; ESD4, 4th electrostatic discharge diode; C11, 11th capacitor. Detailed Implementation

[0025] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0026] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "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 drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, 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.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0029] In specific embodiments of this utility model, such as Figure 1 As shown, a wireless microphone solar charging box is provided, including an upper shell 1. A hollow mounting cavity 101 is provided in the center of the outer surface of the upper shell 1. A solar panel 3 is installed inside the hollow mounting cavity 101, and the light-contact surface of the solar panel 3 contacts the sunlight source along the hollow section. Below the solar panel 3 is a lower shell 2. The upper surface of the lower shell 2 has two charging cavities 202, which are used to house a wireless microphone 5 and provide charging power to the wireless microphone 5. Each of the two charging cavities 202 has a receiving cavity 203 on one side, which is used to store a mobile phone direct-plug receiver 4. A lower shell base 201 is provided at the bottom of the lower shell 2. A battery 7 is located between the lower shell 2 and the lower shell base 201, and a charging circuit board 6 is electrically connected above the battery 7.

[0030] Preferably, refer to Figure 1The front end of the charging circuit board 6 is provided with a USB interface 603. The USB interface 603 is connected to an external USB power source through a through hole on the lower housing 201 to power the charging box. The rear end of the charging circuit board 6 is provided with a flexible flat cable 602. A second through hole 205 is provided between the two charging cavities 202. The top contact end of the flexible flat cable 602 passes through the second through hole 205 and is electrically connected to the bottom of the solar panel 3 to transfer the light energy received by the solar panel 3 to the charging circuit board 6.

[0031] Preferably, refer to Figure 1 The flexible flat cable 602 has two spring pins 601 on each side. The bottom surface of the charging cavity 202 has two first through holes 205. The two spring pins 601 pass through the two first through holes 205 and are connected to the anode input terminal and cathode input terminal of the wireless microphone 5 respectively to charge the wireless microphone 5.

[0032] Reference Figure 2 and Figure 3 The charging circuit board includes a first-order buck and maximum power point tracking circuit, a second-order buck and maximum power point tracking circuit, a power status display circuit, and a voltage and current regulation circuit, wherein: The first-order buck and maximum power point tracking circuit is connected to the solar panel to convert the high-voltage output of the solar panel into a stable low-voltage output and to initially adjust the power operating point of the solar panel. The second-order buck and maximum power point tracking circuit is connected to the first-order buck and maximum power point tracking circuit to convert the stable low-voltage output into the low-voltage DC power required for charging the wireless microphone and to keep the solar panel operating at maximum power. The battery status display circuit is used to provide feedback on the current charging level of the wireless microphone; The voltage and current regulation circuit is used to precisely regulate the charging voltage and current of the wireless microphone.

[0033] Preferably, refer to Figure 2 The first-order buck and maximum power point tracking circuit includes a first electrostatic discharge diode ESD1, a second electrostatic discharge diode ESD2, a fourth capacitor C4, a seventh capacitor C7, a ninth capacitor C9, a tenth capacitor C10, a sixteenth capacitor C16, a seventeenth capacitor C17, a first inductor L1, a synchronous buck converter U2, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a first field-effect transistor Q1, and a second Zener diode D2, wherein: The positive input of the solar panel is connected to the second terminal of the second electrostatic discharge diode ESD2, the first terminal of the seventh capacitor C7, the first terminal of the tenth capacitor C10, the first terminal of the eleventh resistor R11, the first terminal of the fifteenth resistor R15, and the power input pin of the synchronous buck converter U2; the second terminal of the eleventh resistor R11 is connected to the first terminal of the tenth resistor R10 and the enable pin of the synchronous buck converter U2; the second terminal of the fifteenth resistor R15 is connected to the cathode of the second Zener diode D2; the anode of the second Zener diode D2 is connected to the first terminal of the fourteenth resistor R14 and the gate of the first field-effect transistor Q1; the feedback input pin of the synchronous buck converter U2 is connected to the first terminal of the twelfth resistor R12, the first terminal of the sixteenth capacitor C16, and the first terminal of the ninth resistor R9; the second terminal of the sixteenth capacitor C16 is connected to the second terminal of the ninth resistor R9, the first terminal of the fourth capacitor C4, the first terminal of the ninth capacitor C9, and the first inductor L. The first terminal of capacitor 1 is connected to the input terminal of the second-order buck converter and the maximum power point tracking circuit; the second terminal of the first inductor L1 is connected to the first terminal of the seventeenth capacitor C17 and the switch pin of the synchronous buck converter U2; the second terminal of the seventeenth capacitor C17 is connected to the bootstrap pin of the synchronous buck converter U2; the first terminal of the first electrostatic discharge diode ESD1, the source of the first field-effect transistor Q1, the second terminal of the thirteenth resistor R13, the second terminal of the twelfth resistor R12, the second terminal of the fourth capacitor C4 and the second terminal of the ninth capacitor C9 are grounded; the drain of the first field-effect transistor Q1, the second terminal of the tenth resistor R10, the second terminal of the fourteenth resistor R14, the first terminal of the thirteenth resistor R13, the negative input of the solar panel, the second terminal of the first electrostatic discharge diode ESD1, the first terminal of the second electrostatic discharge diode ESD2, the second terminal of the seventh capacitor C7, the second terminal of the tenth capacitor C10 and the ground terminal SLGND of the solar panel are connected.

[0034] In a preferred embodiment of this invention, the thirteenth resistor R13, the fourteenth resistor R14, the fifteenth resistor R15, the first field-effect transistor Q1, and the second Zener diode D2 together constitute a first-order maximum power point tracking circuit. By adjusting the enable pin of the synchronous buck converter U2, the conduction state of the first field-effect transistor Q1 is adjusted, causing a change in the equivalent impedance of the circuit. This shifts the operating point of the solar panel, allowing it to operate at maximum power output and improving the efficiency of solar energy utilization. By changing the voltage regulation value of the second Zener diode D2, the first-order buck converter and maximum power point tracking circuit can be adapted to solar panels with different power ratings.

[0035] In a preferred embodiment of this utility model, the first electrostatic discharge diode ESD1 and the second electrostatic discharge diode ESD2 are combined with the grounding terminal SLGND of the solar panel to form the first part of electrostatic protection. When there is an electrostatic shock to the circuit, the first electrostatic discharge diode ESD1 and the second electrostatic discharge diode ESD2 quickly conduct, directing the electrostatic current to the grounding terminal SLGND of the solar panel, protecting the synchronous buck converter U2 and other sensitive components from electrostatic damage, and improving the reliability and anti-interference capability of the circuit.

[0036] In a preferred embodiment of this utility model, a first-order buck converter is implemented using a synchronous buck converter U2 as the core, in conjunction with a fourth capacitor C4, a seventh capacitor C7, a ninth capacitor C9, a tenth capacitor C10, a sixteenth capacitor C16, a seventeenth capacitor C17, a first inductor L1, a synchronous buck converter U2, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, and a twelfth resistor R12. This converts the relatively high voltage input from the solar panel into a relatively low and stable voltage output, providing a suitable operating voltage for the subsequent first-order maximum power point tracking circuit and the load. At the same time, capacitor filtering ensures the stability of the output voltage.

[0037] Preferably, refer to Figure 3 The second-order buck and maximum power point tracking circuit includes a fifth electrostatic discharge diode ESD5, a sixth electrostatic discharge diode ESD6, a surge protection diode D1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fifth capacitor C5, a sixth capacitor C6, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a second inductor L2, a twenty-third resistor R23, a wire-to-board connector J5, and a multi-functional power management chip U3, wherein: The input terminal of the second-order buck and maximum power point tracking circuit is connected to the first terminal of the sixth electrostatic discharge diode ESD6, the cathode of the surge protection diode D1, the first terminal of the third capacitor C3, the first terminal of the first capacitor C1, the system boost output terminal of the multi-function power management chip U3, the input / output power supply pins of the multi-function power management chip U3, and the first terminal of the thirteenth capacitor C13; the buck switch pin of the multi-function power management chip U3 is connected to the first terminal of the second inductor L2; the second terminal of the second inductor L2 is connected to the first terminal of the twelfth capacitor C12, the first terminal of the fourteenth capacitor C14, the first terminal of the fifth capacitor C5, the cell detection pin of the multi-function power management chip U3, the first terminal of the fifth electrostatic discharge diode ESD5, the cell power supply pin of the multi-function power management chip U3, and the sixth capacitor. The first terminal of C6, the second pin of the wire-to-plate connector J5, and the first terminal of the second capacitor C2 are connected; the third pin of the wire-to-plate connector J5 is connected to the first terminal of the twenty-third resistor R23; the second terminal of the twenty-third resistor R23 is connected to the first terminal of the NTC resistor; the second terminal of the sixth electrostatic discharge diode ESD6, the anode of the surge protection diode D1, the second terminal of the third capacitor C3, the second terminal of the first capacitor C1, the second terminal of the thirteenth capacitor C13, the second terminal of the twelfth capacitor C12, the second terminal of the fourteenth capacitor C14, the second terminal of the fifth electrostatic discharge diode ESD5, the second terminal of the fifth capacitor C5, the second terminal of the sixth capacitor C6, the second terminal of the second capacitor C2, the first pin of the wire-to-plate connector J5, the fourth pin of the wire-to-plate connector J5, and the second terminal of the NTC resistor are grounded.

[0038] In a preferred embodiment of this utility model, the NTC resistor is located inside the battery 7 to reflect the temperature change of the battery 7 during charging. The anode of the battery 7 is connected to the first end of the second capacitor C2; the cathode of the battery 7 is grounded.

[0039] In a preferred embodiment of this utility model, the 23rd resistor R23, the wire-to-plate connector J5, and the NTC resistor together constitute a temperature detection and protection unit. The NTC resistor is connected via the wire-to-plate connector J5 to collect the battery temperature signal in real time. After voltage division by the 23rd resistor R23, the signal is transmitted to the multi-functional power management chip U3, providing a temperature reference for the chip. When the battery temperature is too high or too low, the multi-functional power management chip U3 triggers a corresponding protection mechanism based on the temperature signal, ensuring the safety and stability of the battery charging and discharging process.

[0040] In a preferred embodiment of this utility model, the fifth electrostatic discharge diode ESD5 and the sixth electrostatic discharge diode ESD6 are combined with the grounding terminal to form the second part of electrostatic protection. When the circuit encounters an electrostatic shock, the fifth electrostatic discharge diode ESD5 and the sixth electrostatic discharge diode ESD6 quickly conduct, directing the electrostatic current to the grounding terminal, effectively protecting the multi-functional power management chip U3 and surrounding sensitive components from electrostatic damage, and improving the overall anti-interference capability and reliability of the circuit.

[0041] In a preferred embodiment of this utility model, a multi-functional power management chip U3 is used as the core, along with a second inductor L2, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fifth capacitor C5, a sixth capacitor C6, a twelfth capacitor C12, a thirteenth capacitor C13, and a fourteenth capacitor C14 to achieve a second-order buck converter function. The second-order buck converter circuit receives the output voltage from the first-order buck and maximum power point tracking circuit. Through the two-stage buck regulation module inside the multi-functional power management chip U3, combined with the energy storage and smoothing effect of the second inductor L2, and the filtering processing of multiple capacitors, the input voltage is further converted into a lower and more accurate stable voltage, providing an appropriate operating voltage for the battery and load, ensuring low output voltage ripple and high stability.

[0042] In a preferred embodiment of this invention, the multi-functional power management chip U3 integrates second-order maximum power point tracking (MPPT) functionality. By monitoring input voltage and current parameters in real time, it dynamically adjusts the operating state of the internal switching transistors. Combined with the second inductor L2 and related capacitor components, it achieves efficient tracking and utilization of the energy input from the solar panel. Compared to first-order tracking, the second-order tracking design can respond more quickly to changes in light intensity, maintaining the solar panel at maximum power output even under complex lighting conditions, further improving energy conversion efficiency and extending the device's battery life.

[0043] In a preferred embodiment of this utility model, the surge protection diode D1 plays a surge protection role and is connected in parallel between the circuit input terminal and the ground terminal. When an abnormal high voltage occurs at the input terminal, D1 breaks down and conducts, clamping the voltage within a safe threshold, preventing excessive voltage from damaging core components such as the multi-functional power management chip U3, and providing additional safety protection for the circuit.

[0044] Preferably, refer to Figure 3 The power status display circuit includes a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first light-emitting diode LED1, a second light-emitting diode LED2, a third light-emitting diode LED3, and a fourth light-emitting diode LED4, wherein: The first end of the second resistor R2 is connected to the fifth general-purpose input / output pin of the multi-function power management chip U3; the second end of the second resistor R2 is connected to the anode of the second light-emitting diode LED2; the first end of the third resistor R3 is connected to the fourth general-purpose input / output pin of the multi-function power management chip U3; the second end of the third resistor R3 is connected to the anode of the first light-emitting diode LED1; the first end of the fourth resistor R4 is connected to the eighth general-purpose input / output pin of the multi-function power management chip U3; the second end of the fourth resistor R4 is connected to the anode of the third light-emitting diode LED3; the first end of the fifth resistor R5 is connected to the ninth general-purpose input / output pin of the multi-function power management chip U3; the second end of the fifth resistor R5 is connected to the anode of the fourth light-emitting diode LED4; the cathodes of the first light-emitting diode LED1, the second light-emitting diode LED2, the third light-emitting diode LED3, and the fourth light-emitting diode LED4 are grounded.

[0045] In a preferred embodiment of this utility model, the second resistor R2, the third resistor R3, the fourth resistor R4, and the fifth resistor R5 correspond one-to-one with the first light-emitting diode LED1, the second light-emitting diode LED2, the third light-emitting diode LED3, and the fourth light-emitting diode LED4, respectively, and together constitute a "current limiting-indication" unit to realize hierarchical visual display of power status.

[0046] In a preferred embodiment of this utility model, the power status display circuit uses a multi-functional power management chip U3 as the control core. High and low level signals are output through the fifth, fourth, eighth, and ninth general-purpose input / output pins of the multi-functional power management chip U3 to independently control the conduction and cutoff of the corresponding light-emitting diodes. When the battery's remaining charge is 25%, only the fourth general-purpose input / output pin is controlled to output a high level, driving the first LED (LED1) to light up. When the battery's charge is 50%, the fourth and fifth general-purpose input / output pins are controlled to output a high level, driving the first LED (LED1) and the second LED (LED2) to light up. When the battery's charge is 75%, the fourth, fifth, and eighth general-purpose input / output pins are controlled to output a high level, driving the first LED (LED1), the second LED (LED2), and the third LED (LED3) to light up. When the battery's charge is 100% (fully charged), all four general-purpose input / output pins of the multi-functional power management chip U3 output a high level, causing the first LED (LED1), the second LED (LED2), the third LED (LED3), and the fourth LED (LED4) to light up, achieving a four-level accurate display of the battery's charge level, allowing users to intuitively understand the battery status.

[0047] Preferably, refer to Figure 3The voltage and current regulation circuit includes an eighth capacitor C8, a fifteenth capacitor C15, a first resistor R1, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, and a Hall sensor U1, wherein: The first terminal of the eighth capacitor C8 is connected to the third general-purpose input / output pin of the multi-function power management chip U3; the first terminal of the sixteenth resistor R16 is connected to the second general-purpose input / output pin of the multi-function power management chip U3; the first terminal of the twentieth resistor R20 is connected to the first general-purpose input / output pin of the multi-function power management chip U3; the first terminal of the seventeenth resistor R17 is connected to the zeroth general-purpose input / output pin of the multi-function power management chip U3; the first terminal of the eighteenth resistor R18 is connected to the button drive pin of the multi-function power management chip U3; the Hall switch input pin of the multi-function power management chip U3 is connected to the first terminal of the nineteenth resistor R19 and the twenty-first resistor R... The first terminal of resistor R21 and the first terminal of resistor R22 are connected; the output pin of the multi-function power management chip U3 is connected to the second terminal of resistor R19, the first terminal of capacitor C15, and the first terminal of resistor R1; the second terminal of resistor R1 is connected to the power input terminal of Hall sensor U1; the second terminal of resistor R22 is connected to the output terminal of Hall sensor U1; the second terminal of capacitor C8, the second terminal of resistor R16, the second terminal of resistor R20, the second terminal of resistor R17, the second terminal of resistor R18, the second terminal of capacitor C15, and the second terminal of resistor R21 are grounded.

[0048] In a preferred embodiment of this utility model, the Hall sensor U1, the first resistor R1, the nineteenth resistor R19, the twenty-first resistor R21, and the twenty-second resistor R22 together constitute an opening detection unit to sense the opening / closing status of the charging box in real time. The first resistor R1 is the power supply current-limiting resistor for the Hall sensor U1. It stabilizes and reduces the power supply voltage provided by the output pin of the multi-functional power management chip U3 to provide a safe and constant operating current for the Hall sensor U1. The nineteenth resistor R19, the twenty-first resistor R21, and the twenty-second resistor R22 form a voltage divider and signal conditioning network. On the one hand, it divides the current detection signal output by the Hall sensor U1 to the adaptation range of the Hall switch input pin of the multi-functional power management chip U3. On the other hand, it suppresses signal noise and ensures the purity of the detection signal. The Hall sensor U1 and the magnet inside the cover form a "magnetic switch" combination. When the cover is closed, the magnet is close to the Hall sensor U1, and the magnetic field strength reaches the threshold, so the Hall sensor U1 outputs a low-level signal. When the cover is open, the magnet is away from the Hall sensor U1, the magnetic field strength weakens and falls below the threshold, so the Hall sensor U1 outputs a high-level signal. The status is fed back through the level change and is fed back to the multi-functional power management chip U3 in real time. The multi-functional power management chip U3 determines the opening and closing status of the cover by the high and low levels output by the Hall sensor U1.

[0049] In a preferred embodiment of this utility model, the sixteenth resistor R16, the seventeenth resistor R17, and the twentieth resistor R20, in conjunction with the second, zeroth, and first general-purpose input / output pins of the multi-functional power management chip U3, constitute a charging voltage adjustment unit, enabling precise setting of the charging cut-off voltage for different types of batteries. The voltage division ratio of each resistor is adjusted according to the battery type requirements. For example, when adapting to a 4.2V battery, the multi-functional power management chip U3 controls the second and zeroth general-purpose input / output pins to output a high level, and the sixteenth resistor R16 and the seventeenth resistor R17 are connected to the voltage divider circuit, setting the charging cut-off voltage reference value to 4.2V. When adapting to a 4.4V battery, the multi-functional power management chip U3 controls the first general-purpose input / output pin to output a high level, and the twentieth resistor R20 is added to the voltage divider network, changing the voltage division ratio and raising the reference value to 4.4V. This design allows the circuit to be compatible with various batteries without replacing core components, improving the circuit's versatility.

[0050] In a preferred embodiment of this utility model, the eighth capacitor C8 and the fifteenth capacitor C15 are filter capacitors, connected in parallel between the third general-purpose input / output pin and the output pin of the multi-functional power management chip U3 and ground, respectively. The eighth capacitor C8 filters out high-frequency noise from the output signal of the third general-purpose input / output pin of the multi-functional power management chip U3, preventing noise interference with the stability of the voltage regulation signal; the fifteenth capacitor C15 filters out the voltage ripple from the power supply line of the multi-functional power management chip U3 to the Hall sensor U1, ensuring a stable operating voltage for the Hall sensor U1, further improving the current detection accuracy, and preventing ripple from causing malfunctions in the internal regulation module of the multi-functional power management chip U3, thus ensuring the reliability of voltage and current regulation.

[0051] In a preferred embodiment of this utility model, the voltage and current regulation circuit uses a multi-functional power management chip U3 as its core, constructing a closed-loop control system of "detection-feedback-regulation". The Hall sensor U1 detects the current in real time, and a voltage reference is set via a resistance network. The multi-functional power management chip U3 compares the detected data with the reference value and dynamically adjusts the output parameters through its internal constant voltage and constant current control module. During the initial charging phase, if the detected current is lower than the set value, the multi-functional power management chip U3 increases the output current to the constant current threshold. When the battery voltage approaches the cutoff voltage, the multi-functional power management chip U3 gradually reduces the charging current, switching to constant voltage mode to prevent overcharging and achieve a smooth transition from "constant current" to "constant voltage," balancing charging efficiency and battery life.

[0052] Preferred, refer to Figure 3 The charging circuit board also includes a USB charging circuit, which includes a USB charging interface USB1, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8, wherein: The power pin of the USB charging interface USB1 is connected to the first end of the sixth resistor R6; the second end of the sixth resistor R6 is connected to the first end of the sixth electrostatic discharge diode ESD6; the first channel configuration pin of the USB charging interface USB1 is connected to the first end of the seventh resistor R7; the second channel configuration pin of the USB charging interface USB1 is connected to the first end of the eighth resistor R8; the second end of the eighth resistor R8 and the second end of the seventh resistor R7 are grounded.

[0053] As a preferred embodiment of this utility model, a USB charging circuit is provided at the input terminal of the second-order buck and maximum power point tracking circuit to supplement the charging method of the charging box when using a wired power source.

[0054] Preferred, refer to Figure 3 The charging circuit board also includes an electrostatic discharge (ESD) protection circuit, which includes a third ESD diode (ESD3), a fourth ESD diode (ESD4), and an eleventh capacitor (C11), wherein: The first terminal of the third electrostatic discharge diode ESD3 is connected to the first positive terminal of the microphone of the multi-function power management chip U3 and the first terminal of the eleventh capacitor C11; the first terminal of the fourth electrostatic discharge diode ESD4 is connected to the second positive terminal of the microphone of the multi-function power management chip U3; the second terminals of the third electrostatic discharge diode ESD3, the second terminals of the fourth electrostatic discharge diode ESD4, and the second terminal of the eleventh capacitor C11 are grounded.

[0055] In a preferred embodiment of this utility model, the third electrostatic discharge diode ESD3, the fourth electrostatic discharge diode ESD4, and the eleventh capacitor C11 together constitute a special electrostatic protection unit for the headphone interface of the multi-functional power management chip U3. This unit focuses on protecting the two external signal interfaces of the multi-functional power management chip U3: the first positive terminal of the microphone and the second positive terminal of the microphone, to prevent electrostatic shocks from damaging the interface circuit or affecting the audio signal transmission.

[0056] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A wireless microphone solar charging case, comprising an upper shell and a lower shell, characterized in that, The outer surface of the upper housing has a mounting cavity, in which a solar panel is mounted; the lower housing has a charging cavity, and below the charging cavity is a charging circuit board electrically connected to the solar panel; the charging circuit board has a spring pin electrically connected to the wireless microphone, providing a stable power supply to the wireless microphone; the charging circuit board includes a first-order buck and maximum power point tracking circuit, a second-order buck and maximum power point tracking circuit, a power status display circuit, and a voltage and current regulation circuit, wherein: The first-order buck and maximum power point tracking circuit is connected to the solar panel to convert the high-voltage output of the solar panel into a stable low-voltage output and to initially adjust the power operating point of the solar panel. The second-order buck and maximum power point tracking circuit is connected to the first-order buck and maximum power point tracking circuit to convert the stable low-voltage output into the low-voltage DC power required for charging the wireless microphone and to keep the solar panel operating at maximum power. The power status display circuit is used to provide feedback on the current charging power of the wireless microphone; The voltage and current regulation circuit is used to precisely regulate the charging voltage and current of the wireless microphone.

2. The wireless microphone solar charging box according to claim 1, characterized in that, The first-order buck and maximum power point tracking circuit includes a first electrostatic discharge diode, a second electrostatic discharge diode, a fourth capacitor, a seventh capacitor, a ninth capacitor, a tenth capacitor, a sixteenth capacitor, a seventeenth capacitor, a first inductor, a synchronous buck converter, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a first field-effect transistor, and a second Zener diode, wherein: The positive input of the solar panel is connected to the second terminal of the second electrostatic discharge diode, the first terminal of the seventh capacitor, the first terminal of the tenth capacitor, the first terminal of the eleventh resistor, the first terminal of the fifteenth resistor, and the power input pin of the synchronous buck converter; the second terminal of the eleventh resistor is connected to the first terminal of the tenth resistor and the enable pin of the synchronous buck converter; the second terminal of the fifteenth resistor is connected to the cathode of the second Zener diode; the anode of the second Zener diode is connected to the first terminal of the fourteenth resistor and the gate of the first field-effect transistor; the feedback input pin of the synchronous buck converter is connected to the first terminal of the twelfth resistor, the first terminal of the sixteenth capacitor, and the first terminal of the ninth resistor; the second terminal of the sixteenth capacitor is connected to the second terminal of the ninth resistor, the first terminal of the fourth capacitor, the first terminal of the ninth capacitor, and the power input pin of the synchronous buck converter. The first terminal of an inductor is connected to the input terminal of the second-order buck and maximum power point tracking circuit; the second terminal of the first inductor is connected to the first terminal of the seventeenth capacitor and the switching pin of the synchronous buck converter; the second terminal of the seventeenth capacitor is connected to the bootstrap pin of the synchronous buck converter; the first terminal of the first electrostatic discharge diode, the source of the first field-effect transistor, the second terminal of the thirteenth resistor, the second terminal of the twelfth resistor, the second terminal of the fourth capacitor, and the second terminal of the ninth capacitor are grounded; the drain of the first field-effect transistor, the second terminal of the tenth resistor, the second terminal of the fourteenth resistor, the first terminal of the thirteenth resistor, the negative input of the solar panel, the second terminal of the first electrostatic discharge diode, the first terminal of the second electrostatic discharge diode, the second terminal of the seventh capacitor, and the second terminal of the tenth capacitor are connected to the ground terminal of the solar panel.

3. A wireless microphone solar charging box according to claim 2, characterized in that, The second-order buck and maximum power point tracking circuit includes a fifth electrostatic discharge diode, a sixth electrostatic discharge diode, a surge protection diode, a first capacitor, a second capacitor, a third capacitor, a fifth capacitor, a sixth capacitor, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a second inductor, a twenty-third resistor, a wire-to-board connector, and a multi-functional power management chip, wherein: The input terminal of the second-order buck and maximum power point tracking circuit is connected to the first terminal of the sixth electrostatic discharge diode, the cathode of the surge protection diode, the first terminal of the third capacitor, the first terminal of the first capacitor, the system boost output terminal of the multi-functional power management chip, the input / output power supply pins of the multi-functional power management chip, and the first terminal of the thirteenth capacitor; the buck switch pin of the multi-functional power management chip is connected to the first terminal of the second inductor; the second terminal of the second inductor is connected to the first terminal of the twelfth capacitor, the first terminal of the fourteenth capacitor, the first terminal of the fifth capacitor, the cell detection pin of the multi-functional power management chip, the first terminal of the fifth electrostatic discharge diode, the cell power supply pin of the multi-functional power management chip, and the... The first terminal of the sixth capacitor, the second pin of the wire-to-plate connector, and the first terminal of the second capacitor are connected; the third pin of the wire-to-plate connector is connected to the first terminal of the twenty-third resistor; the second terminal of the twenty-third resistor is connected to the first terminal of the NTC resistor; the second terminal of the sixth electrostatic discharge diode, the anode of the surge protection diode, the second terminal of the third capacitor, the second terminal of the first capacitor, the second terminal of the thirteenth capacitor, the second terminal of the twelfth capacitor, the second terminal of the fourteenth capacitor, the second terminal of the fifth electrostatic discharge diode, the second terminal of the fifth capacitor, the second terminal of the sixth capacitor, the second terminal of the second capacitor, the first pin of the wire-to-plate connector, the fourth pin of the wire-to-plate connector, and the second terminal of the NTC resistor are grounded.

4. A wireless microphone solar charging box according to claim 3, characterized in that, The power status display circuit includes a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first light-emitting diode, a second light-emitting diode, a third light-emitting diode, and a fourth light-emitting diode, wherein: The first end of the second resistor is connected to the fifth general purpose input / output pin of the multi-functional power management chip; the second end of the second resistor is connected to the anode of the second light-emitting diode; the first end of the third resistor is connected to the fourth general purpose input / output pin of the multi-functional power management chip; the second end of the third resistor is connected to the anode of the first light-emitting diode; the first end of the fourth resistor is connected to the eighth general purpose input / output pin of the multi-functional power management chip; the second end of the fourth resistor is connected to the anode of the third light-emitting diode; the first end of the fifth resistor is connected to the ninth general purpose input / output pin of the multi-functional power management chip; the second end of the fifth resistor is connected to the anode of the fourth light-emitting diode; the cathodes of the first light-emitting diode, the second light-emitting diode, the third light-emitting diode, and the fourth light-emitting diode are grounded.

5. A wireless microphone solar charging box according to claim 4, characterized in that, The voltage and current regulation circuit includes an eighth capacitor, a fifteenth capacitor, a first resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, and a Hall sensor, wherein: The first terminal of the eighth capacitor is connected to the third general purpose input / output pin of the multi-functional power management chip; the first terminal of the sixteenth resistor is connected to the second general purpose input / output pin of the multi-functional power management chip; the first terminal of the twentieth resistor is connected to the first general purpose input / output pin of the multi-functional power management chip; the first terminal of the seventeenth resistor is connected to the zero general purpose input / output pin of the multi-functional power management chip; the first terminal of the eighteenth resistor is connected to the button drive pin of the multi-functional power management chip; the Hall switch input pin of the multi-functional power management chip is connected to the first terminals of the nineteenth, twenty-first, and twenty-second resistors; the output pin of the multi-functional power management chip is connected to the second terminal of the nineteenth resistor, the first terminal of the fifteenth capacitor, and the first terminal of the first resistor; the second terminal of the first resistor is connected to the power supply input terminal of the Hall sensor; the second terminal of the twenty-second resistor is connected to the output terminal of the Hall sensor; the second terminals of the eighth capacitor, the sixteenth resistor, the twentieth resistor, the seventeenth resistor, the eighteenth resistor, the fifteenth capacitor, and the twenty-first resistor are grounded.

6. A wireless microphone solar charging box according to claim 5, characterized in that, The charging circuit board further includes a USB charging circuit, which includes a USB charging interface, a sixth resistor, a seventh resistor, and an eighth resistor, wherein: The power pin of the USB charging interface is connected to the first end of the sixth resistor; the second end of the sixth resistor is connected to the first end of the sixth electrostatic discharge diode; the first channel configuration pin of the USB charging interface is connected to the first end of the seventh resistor; the second channel configuration pin of the USB charging interface is connected to the first end of the eighth resistor; and the second end of the eighth resistor is grounded to the second end of the seventh resistor.

7. A wireless microphone solar charging box according to claim 6, characterized in that, The charging circuit board also includes an electrostatic discharge (ESD) protection circuit, which comprises a third ESD diode, a fourth ESD diode, and an eleventh capacitor, wherein: The first terminal of the third electrostatic discharge diode is connected to the first positive terminal of the microphone of the multi-functional power management chip and the first terminal of the eleventh capacitor; the first terminal of the fourth electrostatic discharge diode is connected to the second positive terminal of the microphone of the multi-functional power management chip; the second terminals of the third electrostatic discharge diode, the second terminals of the fourth electrostatic discharge diode, and the second terminal of the eleventh capacitor are grounded.

8. A wireless microphone solar charging box according to claim 1, characterized in that, The lower housing also has a receiving cavity for storing the mobile phone direct-plug receiver.

9. A wireless microphone solar charging box according to claim 7, characterized in that, A storage battery is also provided below the charging cavity. The NTC resistor is located inside the storage battery and reflects the temperature change of the storage battery during charging. The anode of the storage battery is connected to the first terminal of the second capacitor. The cathode of the storage battery is grounded.

10. A wireless microphone solar charging box according to claim 1, characterized in that, The charging circuit board is equipped with a flexible flat cable that extends out from the lower housing and abuts against the solar panel, transmitting the light energy received by the solar panel to the charging circuit board.

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