Inverter circuit applied to solar backpack

Abstract

The utility model discloses an inverter circuit applied to a solar backpack, which comprises a power supply control circuit, a voltage conversion circuit and a protection circuit, wherein the power supply control circuit is electrically connected with a storage battery and is used for controlling the charging and / or discharging of the storage battery and transmitting a first direct current voltage; the input end of the voltage conversion circuit is electrically connected with the storage battery, and the voltage conversion circuit is used for converting direct current transmitted by the storage battery into alternating current and outputting the alternating current; and the protection circuit is electrically connected with the power supply control circuit and is used for controlling the voltage conversion circuit to stop working based on whether the working temperature of the current circuit exceeds a set threshold range or not. Through the above design, when a user uses the inverter outdoors, fire and burnout caused by temperature rise when the inverter works and when a high-power electric appliance is used can be prevented, safety accidents are avoided, and some practical functions are added at the same time.

Description

Technical Field

[0001] This utility model relates to the technical field of inverters, and in particular to a DC-AC inverter circuit and inverter for use in solar backpacks. Background Technology

[0002] As our lifestyles continue to change, we often work and live outdoors, and electricity is indispensable for both. However, it is often difficult to connect to mains power outdoors. Therefore, solar backpacks have emerged. Solar backpacks receive solar energy through solar panels and convert it into electrical energy to power batteries, thereby powering mobile phones, computers, or other devices that require electricity.

[0003] The problem is that most solar backpack inverters on the market lack overheat protection. For example, in outdoor environments with strong sunlight and high temperatures, the inverter generates a lot of heat when supplying power, causing it to overheat and potentially burn out the circuitry, leading to a safety hazard. Furthermore, the inverters in current solar backpacks offer limited functionality and cannot meet the needs of various usage scenarios. Utility Model Content

[0004] In order to address the technical deficiencies mentioned in the background section, the purpose of this utility model is to provide an inverter circuit for solar backpacks that can prevent the inverter from overheating and catching fire when used outdoors or when using high-power electrical appliances, thus avoiding safety accidents and adding some practical functions.

[0005] The present invention adopts the following technical solution:

[0006] An inverter circuit for use in a solar-powered backpack includes:

[0007] A power control circuit, which is electrically connected to the battery, is used to control the charging and / or discharging of the battery and to deliver a first DC voltage.

[0008] A voltage conversion circuit, wherein the input terminal of the voltage conversion circuit is electrically connected to the battery, and the voltage conversion circuit is used to convert the DC power supplied by the battery into AC power output;

[0009] A protection circuit is electrically connected to the power control circuit. The protection circuit is used to control the voltage conversion circuit to stop working if the current operating temperature of the circuit exceeds a set threshold range.

[0010] Optionally, the voltage conversion circuit includes:

[0011] A voltage input module, the input terminal of which is electrically connected to the battery.

[0012] The voltage input module is used to receive the DC voltage supplied by the battery;

[0013] The boost module, therefore the input side of the boost module is connected to the output of the voltage control circuit.

[0014] The voltage boost module is electrically connected to the voltage input module and is used to boost the DC voltage supplied by the voltage input module.

[0015] An inverter module is electrically connected to the output side of the boost module, and the inverter circuit is used to convert the DC voltage delivered by the boost module into AC voltage.

[0016] Optionally, the voltage input module includes:

[0017] The first protection unit has its input terminal electrically connected to the output terminal of the power control circuit. The first protection unit is used to prevent the voltage delivered by the power control circuit from being too high or experiencing a surge.

[0018] The first voltage divider unit has its input terminal electrically connected to the output terminal of the first protection power supply, and is used to provide reference voltage for other circuits.

[0019] Optionally, the boost module includes:

[0020] A drive signal generation unit, wherein the input terminal of the drive signal generation unit is electrically connected to the output terminal of the first voltage divider unit, and the drive signal generation unit is used to convert the low voltage signal of the power control circuit into a high frequency pulse signal;

[0021] A boost converter, wherein the primary side of the boost converter is electrically connected to the drive signal generation unit and the power control circuit respectively, and the secondary side of the boost converter is electrically connected to the input terminal of the inverter module. The boost converter is used to convert the first DC voltage delivered by the power management circuit into a second DC voltage based on the drive signal generation unit.

[0022] The second protection unit has its input terminal electrically connected to the secondary side of the boost converter, and its output terminal electrically connected to the input terminal of the inverter module.

[0023] Optionally, the inverter module includes:

[0024] An inverter unit is used to convert the two DC voltages supplied by the second protection unit into AC voltages.

[0025] An AC voltage output port is electrically connected to the output terminal of the inverter unit and is used to output AC voltage to power external devices.

[0026] Optionally, the protection circuit includes:

[0027] A power supply unit, the input terminal of which is electrically connected to the power control circuit;

[0028] A temperature detection unit is provided, the input terminal of which is electrically connected to the output terminal of the power supply unit. The temperature detection unit is used to detect the operating temperature in the circuit in real time and adjust the corresponding voltage according to the operating temperature to turn on / off the voltage supplied by the power supply unit.

[0029] The control chip has a power supply terminal and a control terminal. The power supply terminal is electrically connected to the temperature detection unit, and the control terminal is electrically connected to the inverter unit. The control chip is used to control the operation / non-operation of the inverter unit based on whether the temperature detection unit is supplying voltage.

[0030] Optionally, the temperature detection unit includes:

[0031] Thermistors are used to detect the operating temperature of the entire circuit in real time and adjust their resistance accordingly based on the operating temperature.

[0032] The second voltage divider unit is electrically connected to the thermistor;

[0033] A voltage regulator, the input terminal of which is electrically connected to the thermistor, is used to set the trigger voltage of the protection circuit. When the voltage delivered by the thermistor exceeds the set trigger voltage, the circuit is turned on.

[0034] A switching element, the base of which is electrically connected to the output terminal of the voltage regulator, is used to drive the switching element to conduct based on the voltage output by the voltage regulator and to pull the voltage supplied by the power supply unit low to ground.

[0035] Optionally, a USB output circuit is also included, the input of which is electrically connected to the power control circuit for supplying power to external devices.

[0036] Optionally, it also includes a Type-C output circuit, which is electrically connected to the power control circuit and is used to supply power to external devices.

[0037] Optionally, a power display circuit is also included, which is electrically connected to the power control circuit and is used to display the current power level of the battery.

[0038] In summary, the beneficial effects of this utility model are as follows:

[0039] By setting up a power control circuit, overcharging and over-discharging of the battery can be prevented during charging. It also functions as a master switch, allowing the power to be turned off when not in use, thus preventing safety accidents. It can also provide power control for other circuits. By setting up a voltage conversion circuit, the low-voltage DC voltage of the battery can be converted into high-voltage AC voltage, making it convenient for high-power appliances to be used outdoors. Furthermore, by setting up a protection circuit, the voltage conversion circuit can be prevented from burning out due to high temperature under overload conditions. It can also prevent the inverter from burning out due to excessive temperature outdoors, thus improving the safety of use.

[0040] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0041] Figure 1 This is a circuit architecture diagram of the inverter according to an embodiment of the present invention;

[0042] Figure 2 This is a schematic diagram of the power control circuit according to an embodiment of the present invention;

[0043] Figure 3 This is a schematic diagram of the voltage conversion circuit according to an embodiment of the present invention;

[0044] Figure 4 This is a schematic diagram of the voltage input module according to an embodiment of the present invention;

[0045] Figure 5 This is a schematic diagram of the boost module according to an embodiment of the present invention;

[0046] Figure 6 This is a schematic diagram of the inverter module according to an embodiment of the present invention;

[0047] Figure 7 This is a schematic diagram of the protection circuit of an embodiment of this utility model;

[0048] Figure 8 This is a schematic diagram of the USB output circuit according to an embodiment of the present invention;

[0049] Figure 9 This is a schematic diagram of the Type-C output circuit according to an embodiment of this utility model;

[0050] Figure 10 This is a schematic diagram of the display circuit according to an embodiment of the present invention.

[0051] Explanation of the reference numerals in the figure:

[0052] 100. Power control circuit; 101. Battery charging and discharging management module; change, charging control terminal; discharge, discharging control terminal; 102. Main switch control module;

[0053] 200. Voltage conversion circuit; 210. Voltage input module; 211. First protection unit; 212. First voltage divider unit; 220. Boost module; 221. Drive signal generation unit; 222. Boost converter; 223. Second protection unit; 230. Inverter module; 231. Inverter unit;

[0054] 300. Protection circuit; 310. Power supply unit; 320. Temperature detection unit; 321. Second voltage divider unit; 330. Control chip;

[0055] 400. USB output circuit;

[0056] 500, Type-C output circuit;

[0057] 600. Display circuit. Detailed Implementation

[0058] To make the content of this utility model easier to understand, the present utility model will be further described below with reference to specific embodiments and accompanying drawings.

[0059] It should be noted that the terms "center," "upper," "lower," "front," "rear," "left," "right," "inner," and "outer" used herein to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing 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, and therefore should not be construed as a limitation of this utility model. Unless otherwise stated, "a plurality of" means two or more.

[0060] Unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0061] like Figures 1-10As shown in the figure, this application embodiment provides an inverter circuit for a solar backpack, including a power control circuit 100, a voltage conversion circuit 200, and a protection circuit 300. The power control circuit 100 is electrically connected to a battery and is used to control the charging and / or discharging of the battery and to supply a first DC voltage. The input terminal of the voltage conversion circuit 200 is electrically connected to the battery, and the voltage conversion circuit 200 is used to convert the DC power supplied by the battery into AC power output. The protection circuit 300 is electrically connected to the power control circuit 100, and the protection circuit 300 is used to control the voltage conversion circuit 200 to stop working if the current operating temperature exceeds a set threshold range.

[0062] like Figure 2 As shown in this embodiment, the power control circuit 100 includes a battery charging and discharging management module 101. This module has a charging control terminal (change) and a discharging control terminal (dischange). By setting the charging control terminal (change), the charging path from the solar panel to the battery can be controlled to prevent overcharging. By setting the discharging control terminal (dischange), the discharging path from the battery to the load can be controlled to prevent over-discharging. When the output voltage of the solar panel (via S+) is higher than the battery voltage, the change signal is activated. This turns on the first NPN transistor Q7, causing the first MOSFET Q3 to turn on, thus enabling the solar panel to charge the battery. When the battery charging and discharging management module 101 detects a load connected to port CON2, it detects that the load requires current, thereby activating the discharge signal. When the battery voltage approaches the lower discharge limit (e.g., 3.0V), the discharge signal is turned off, and discharging stops. The base of the second NPN transistor is electrically connected to the discharge control terminal (dischange), its emitter is grounded, and its collector is electrically connected to the gate of the second MOSFET. When the second NPN transistor Q8 is turned on, the second MOSFET will also be turned on by Q8. At this time, the battery will release current to port CON2, thereby providing power to the load. The battery charge and discharge management module 101 also includes a main switch control module 102. The main switch control module 102 has a switch control port ON / OFF. This main switch control module 102 is used to control the total discharge of the battery. It can be understood as equivalent to the main switch of the entire inverter circuit. Setting up the main switch control module 102 allows the user to control the on and off of the entire circuit through a switch. When the inverter is not needed, the main power can be turned off, thereby improving the safety of this application.

[0063] like Figure 3As shown, the input terminal of the voltage conversion circuit 200 is electrically connected to the battery. By connecting to the output terminal of the battery, it can convert the DC voltage supplied by the battery into AC voltage. Specifically, the DC voltage is input through the BAT+ port of the voltage input module 210. First, the voltage input module 210 performs voltage protection and filtering. The stabilized DC voltage then enters the boost module 220. The boost module 220 uses the drive signal generation unit 221 and a boost transformer to raise the input low-voltage DC voltage to the target high-voltage DC voltage, providing energy for the subsequent inverter module 230. The boosted high-voltage DC current is then connected to the inverter module 230. The inverter unit 231 and the boost transformer 222 convert the high-voltage DC signal into high-frequency AC power, which is then rectified and filtered to output a stable AC power for the load. The entire circuit achieves efficient energy conversion from low-voltage DC to high-voltage AC, offering advantages such as a wide input voltage range, high output stability, and good protection for the battery and load. It is suitable for scenarios requiring efficient DC-to-AC conversion.

[0064] like Figure 7 As shown, the protection circuit 300 is used to control the opening and closing of the voltage conversion circuit 200. The input terminal BAT+ of the protection circuit 300 is electrically connected to the output terminal of the power control circuit 100. By setting the protection circuit 300, when the inverter is under load, it can prevent excessive power consumption of the load from causing the circuit to overheat and even burn out. Specifically, the protection circuit 300 can preset a temperature, and the temperature detection unit 320 can detect the operating temperature of the circuit in real time. If the current operating temperature exceeds the set threshold range, the voltage conversion circuit 200 is controlled to stop working. This protects the voltage conversion circuit 200 from overheating under high load conditions by detecting the temperature in real time and preventing the circuit from burning out or even causing a fire.

[0065] Optional, such as Figure 4 As shown, the voltage input module 210 includes a first protection unit 211 and a first voltage divider unit 212. The input terminal of the first protection unit 211 is electrically connected to the output terminal of the power control circuit 100. The first protection unit 211 is used to prevent the voltage supplied by the power control circuit 100 from being too high or experiencing a surge. The input terminal of the first voltage divider unit 212 is electrically connected to the output terminal of the first protection power supply and is used to provide a reference voltage for other circuits.

[0066] In this embodiment, the first protection unit 211 includes a first Zener diode Z1 and a first filter capacitor C3 to provide surge protection and filtering for the battery voltage. Its input terminal is connected to the output terminal of the power control circuit 100 to prevent excessive voltage or surges from damaging subsequent circuits. The first voltage divider unit 212 consists of a first resistor R5, a second resistor R3, a third resistor R4, and a fourth resistor R10. The input terminal of the first voltage divider unit 212 is connected to the output terminal of the first protection unit 211 to perform voltage division on the input voltage, providing a stable reference voltage for subsequent circuits. This module effectively protects subsequent circuits from input voltage fluctuations and provides the necessary voltage reference for the boost module 220 and the inverter module 230, improving the stability and reliability of the system.

[0067] Optional, such as Figure 5 As shown, the boost module 220 includes a drive signal generation unit 221, a boost converter 222, and a second protection unit 223. The input terminal of the drive signal generation unit is electrically connected to the output terminal of the first voltage divider unit 212. The drive signal generation unit is used to convert the low-voltage signal of the power control circuit 100 into a high-frequency pulse signal. The primary side of the boost converter 222 is electrically connected to the drive signal generation unit 221 and the power control circuit 100, respectively. The secondary side of the boost converter 222 is electrically connected to the input terminal of the inverter module 230. The boost converter 222 is used to convert the first DC voltage delivered by the power management circuit into a second DC voltage based on the drive signal generation unit 221. The input terminal of the second protection unit 223 is electrically connected to the secondary side of the boost converter 222, and the output terminal of the second protection unit 223 is electrically connected to the input terminal of the inverter module 230.

[0068] In this embodiment, the boost module 220 includes a drive signal generation unit 221, a boost converter 222, and a second protection unit 223. The drive signal generation unit 221 consists of a PWM controller U1 and its peripheral components (such as a fifth resistor R11, a sixth resistor R12, and a first capacitor C2). Its input terminal is connected to the output terminal of the first voltage divider circuit, and it is used to convert the low-voltage signal provided by the power control circuit 100 into a high-frequency pulse signal to drive the boost converter 222. The boost converter 222 is electrically connected to the drive signal generation unit 221 and the power control circuit 100 on its primary side, and is used to boost the first DC voltage supplied by the power control circuit 100 to a second DC voltage based on the high-frequency pulse signal. The secondary side of the boost converter 222 is connected to the input of the inverter module 230 via the output of the second protection unit 223 (composed of the second Schottky diode D4, the third Schottky diode D3, the fourth Schottky diode D5, and the fifth Schottky diode D6 in the figure). The second protection unit 223 is used to rectify and filter the boosted high-voltage DC power to provide a stable second DC voltage for the inverter module 230. Through this boost module 220, efficient conversion from low-voltage DC to high-voltage DC can be achieved. Simultaneously, the protection unit ensures voltage stability and circuit safety, enhancing the reliability and output quality of the boost module 220's voltage output.

[0069] Optional, such as Figure 6 As shown, the inverter module 230 includes an inverter unit 231 and an AC voltage output port. The inverter unit 231 is used to convert the two DC voltages supplied by the second protection unit 223 into AC voltages. The AC voltage output port is electrically connected to the output terminal of the inverter unit 231 and is used to output AC voltage to power external devices.

[0070] In this embodiment, the inverter unit 231 can be composed of an H-bridge circuit, used to convert the high-voltage DC output from the second protection unit 223 of the boost module 220 into AC voltage. The inverter unit 231 controls the switching of the first field-effect transistor Q9, the second field-effect transistor Q10, and the third field-effect transistor Q11 in the H-bridge circuit via a drive unit (composed of the first transistor Q6, the second transistor Q7, and their peripheral resistors R29, R34, R31, and R37), causing the DC current to switch according to a specific frequency and direction. The first field-effect transistor Q9 and the third field-effect transistor Q11 conduct alternately, forming an alternating current direction, and outputting an AC signal to the AC voltage output port CON1. Diodes D12, D13, D9, and D11 provide a freewheeling path when transistors Q9, Q10, and Q11 are turned off, preventing back electromotive force caused by inductive loads from damaging them. Capacitors C13 and C14 work in conjunction with diodes D12, D13, D9, and D11 to filter high-frequency spikes, ensuring a smooth output signal. Resistors R35 and R38 limit the gate drive current to prevent high-frequency oscillations. AC voltage is supplied to external devices through output port CON1. ​​This module works closely with the boost module 220, achieving stable AC output through efficient inversion, ensuring efficient and safe power supply to the load. This enables the supply of power to external high-voltage devices, enriching its application scenarios and enhancing its functionality.

[0071] Optional, such as Figure 7 As shown, the protection circuit 300 includes a power supply unit 310, a temperature detection unit 320, and a control chip 330. The input terminal of the power supply unit 310 is electrically connected to the power control circuit 100. The input terminal of the temperature detection unit 320 is electrically connected to the output terminal of the power supply unit 310. The temperature detection unit 320 is used to detect the operating temperature in the circuit in real time and adjust the corresponding voltage according to the operating temperature to turn on / off the voltage supplied by the power supply unit 310. The control chip 330 has a power supply terminal and a control terminal. The power supply terminal is electrically connected to the temperature detection unit 320, and the control terminal is electrically connected to the inverter unit 231. The control chip 330 is used to control the operation / non-operation of the inverter unit 231 based on whether the temperature detection unit 320 supplies voltage.

[0072] In this embodiment, the input terminal BAT+ of the power supply unit 310 is electrically connected to the output terminal of the power control circuit 100. The input voltage is first shunt by the thirteenth resistor R41 and the fourteenth resistor R17 to limit the input current and provide voltage protection. Then, the input voltage is initially smoothed by the second filter capacitor C7 to reduce voltage fluctuations. After voltage regulation at the input terminal, the voltage enters U2 (a DC-DC buck regulator chip), which converts the higher input DC voltage into a stable 12V output. The output terminal further smooths the stepped-down voltage through the third filter capacitor C6 and the fourth filter capacitor C8, thereby providing a 12V voltage to the temperature detection unit 320. The temperature detection unit 320 is used to detect the ambient temperature of the current operating environment and compare it with the set temperature threshold. Specifically, the voltage delivered by the power supply unit 310 changes in the temperature detection unit 320 due to the change in the resistance of the thermistor, which in turn sends a stop signal to the control chip 330. Specifically, the 12V output terminal of the temperature detection unit 320 is electrically connected to pin 15 of the control chip 330, which is the VCC pin of the control chip 330. At this time, the control chip 330 controls the inverter module 230 to stop working.

[0073] Furthermore, such as Figure 7 As shown, the temperature detection unit 320 comprises a thermistor, a second voltage divider unit 321, a voltage regulator, and a switching element. The thermistor is used to detect the operating temperature of the entire circuit in real time and adjust its resistance value accordingly based on the operating temperature. The second voltage divider unit 321 is electrically connected to the thermistor. The input terminal of the voltage regulator is electrically connected to the thermistor and is used to set the trigger voltage of the protection circuit 300. When the voltage delivered by the thermistor exceeds the set trigger voltage, the circuit is turned on. The base of the switching element is electrically connected to the output terminal of the voltage regulator. The switching element is used to drive the switching element to turn on based on the voltage output by the voltage regulator and pull the voltage delivered by the power supply unit 310 low to ground.

[0074] In this embodiment, a thermistor NTC2, a second voltage divider unit 321, a voltage regulator Z3 (which can be a Zener diode), and a switching element Q12 (which can be a field-effect transistor) are used to monitor the circuit temperature and provide over-temperature protection. It should be understood that the thermistor NTC2 has a negative temperature coefficient, and its resistance decreases as temperature increases. When the temperature rises, the resistance of NTC2 decreases, and the voltage at the voltage divider point (the output voltage of the voltage divider network of the fifteenth resistor R40 and the sixteenth resistor R43) increases. When the voltage at the voltage divider point exceeds the voltage regulation value of the Zener element Z3, the Zener element Z3 conducts, providing a driving voltage to the gate of the switching element Q12. The switching element Q12 then conducts, pulling the 12V supply voltage down to ground through the ground terminal of CON2, cutting off the subsequent power supply to the control chip 330. When the control chip 330 has no operating voltage, the inverter module 230 stops working, thus providing over-temperature protection and effectively protecting the entire system from high-temperature damage, improving the safety and stability of the circuit.

[0075] Optional, such as Figure 8 As shown, it also includes a USB output circuit 400, the input terminal of which is electrically connected to the power control circuit 100 for supplying power to external devices.

[0076] In this embodiment, the USB output circuit 400 receives power from the power control circuit 100 via its input terminal VIN. The USB output circuit 400 includes a step-down chip U1, a fifth filter capacitor C12, a sixth filter capacitor C11, a first energy storage inductor L3, a first freewheeling diode D5, a second freewheeling diode D6, a seventeenth resistor R43, an eighteenth resistor R44, a nineteenth resistor R45, and a twentieth resistor R46. The step-down chip U1 and its peripheral circuitry convert the input voltage into a stable 5V DC power supply for the USB interface. The input voltage is first initially filtered by the fifth filter capacitor C12 and the sixth filter capacitor C11 to reduce power supply noise, and then enters the step-down chip U1. The step-down chip U1, through its built-in switching transistor and control circuitry, combined with the external first energy storage inductor L3 and the first and second freewheeling diodes D5 and D6, steps down the input voltage to a 5V DC output. The first energy storage inductor L3 works in conjunction with the first freewheeling diode D5 and the second freewheeling diode D6 to achieve continuous energy transfer under the switching action of the step-down chip U1. At the output, the voltage is further smoothed and filtered by the seventh filter capacitor C9, the eighth filter capacitor C10, and the ninth filter capacitor C8 to ensure stable voltage at the USB interface. The seventeenth resistor R43, the eighteenth resistor R44, the nineteenth resistor R45, and the twentieth resistor R46 are used for signal adaptation and voltage division at the USB interface, ensuring normal data communication. The entire circuit has efficient voltage reduction capability and stable power output, ensuring safe and reliable power supply to external devices. Simultaneously, the USB interface design conforms to standards, supporting the connection and use of common USB devices.

[0077] Optional, such as Figure 9 As shown, it also includes a Type-C output circuit 500, which is electrically connected to the power control circuit 100 and is used to supply power to external devices.

[0078] In this embodiment, the input terminal of the Type-C output circuit 500 is electrically connected to the power control circuit 100 to provide efficient fast charging for external devices. It consists of a fast charging chip U4, a second energy storage inductor L4, etc. The fast charging chip U4 receives the input voltage and dynamically adjusts the voltage through an internal buck-boost control circuit and the external second energy storage inductor L4 to meet the fast charging protocol requirements of the Type-C interface. The Type-C interface supports bidirectional communication; its pins (such as CC1 and CC2) interact with the fast charging chip U4 to negotiate the output voltage and current protocol (such as the PD protocol) to ensure that external devices receive appropriate voltage and power. Through the Type-C output circuit 500, fast charging is achieved, offering advantages such as dynamically adjustable voltage, high efficiency, and strong output stability, meeting the power supply needs of various devices.

[0079] Optional, such as Figure 10As shown, it also includes a power display circuit 600, which is electrically connected to the power control circuit 100 and is used to display the current power level of the battery.

[0080] In this embodiment, the power supply is provided by the power control circuit 100 to display the current battery level. The input voltage is first converted from a higher voltage to a stable 3V operating voltage by the step-down module U1, supplying the display chip U2 and the display unit. The display chip U2 receives the battery voltage signal (through a voltage divider and filter network composed of the 21st R1, 22nd R2, and the 10th filter capacitor C2), samples and processes the voltage value, and drives the seven-segment display U3 to display the corresponding battery level information according to a preset voltage threshold range. Each segment of the seven-segment display (a, b, c, etc.) is controlled to turn on or off through the output ports of U2 (such as U2_15, U2_14, etc.) to display the battery level status. The battery level display provides user-friendly and intuitive feedback by monitoring the battery voltage in real time, effectively preventing interruption of use due to insufficient power. At the same time, the accuracy and reliability of the display are improved by the reasonable design of the voltage divider network and filter circuit. The entire circuit has low power consumption and a simple structure, making it suitable for use in portable devices for battery level indication.

[0081] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. An inverter circuit applied to a solar backpack, characterized by, The application relates to a power supply control circuit, which comprises the following parts: a power supply control circuit, which is electrically connected with a storage battery, is used for controlling the charging and / or discharging of the storage battery and delivering a first direct-current voltage; a voltage conversion circuit, the input end of which is electrically connected with the storage battery, and which is used for converting the direct current delivered by the storage battery into alternating current output; a protection circuit, which is electrically connected with the power supply control circuit, and which is used for controlling the voltage conversion circuit to stop working based on whether the working temperature of the current circuit exceeds a set threshold range.

2. An inverter circuit for a solar backpack as claimed in claim 1, wherein, The voltage conversion circuit comprises: a voltage input module, the input end of which is electrically connected with the storage battery, the voltage input module is used for receiving the direct-current voltage delivered by the storage battery; a voltage boosting module, the input side of which is electrically connected with the output end of the voltage control circuit, the voltage boosting module is used for boosting the direct-current voltage delivered by the voltage input module; an inverter module, which is electrically connected with the output side of the voltage boosting module, and which is used for converting the direct-current voltage delivered by the voltage boosting module into alternating current voltage.

3. An inverter circuit for a solar backpack as claimed in claim 2, wherein, The voltage input module comprises: a first protection unit, the input end of which is electrically connected with the output end of the power supply control circuit, and which is used for preventing the voltage delivered by the power supply control circuit from being too high or surging; a first voltage dividing unit, the input end of which is electrically connected with the output end of the first protection power supply, and which is used for providing reference voltage for other circuits.

4. An inverter circuit for a solar backpack as claimed in claim 3, wherein, The voltage boosting module comprises: a driving signal generating unit, the input end of which is electrically connected with the output end of the first voltage dividing unit, and which is used for converting the low-voltage signal of the power supply control circuit into a high-frequency pulse signal; a voltage booster, the primary side of which is respectively electrically connected with the driving signal generating unit and the power supply control circuit, the secondary side of which is electrically connected with the input end of the inverter module, and which is used for converting the first direct-current voltage delivered by the power supply management circuit into a second direct-current voltage based on the driving signal generating unit; a second protection unit, the input end of which is electrically connected with the secondary side of the voltage booster, and the output end of which is electrically connected with the input end of the inverter module.

5. An inverter circuit for a solar backpack as claimed in claim 4, wherein, The inverter module comprises: an inverter unit, which is used for converting the second direct-current voltage delivered by the second protection unit into alternating current voltage; an alternating current voltage output port, which is electrically connected with the output end of the inverter unit, and which is used for outputting alternating current voltage to supply power to external equipment.

6. An inverter circuit for a solar backpack as claimed in claim 5, wherein, The protection circuit comprises: a power supply unit, the input end of which is electrically connected with the power supply control circuit; a temperature detection unit, the input end of which is electrically connected with the output end of the power supply unit, and which is used for detecting the working temperature of the circuit in real time, and adjusting the corresponding voltage according to the working temperature, so as to turn on / off the voltage delivered by the power supply unit. The control chip has a power supply end and a control end, the power supply end is electrically connected with the temperature detection unit, the control end is electrically connected with the inverter unit, and the control chip is used for controlling the working / non-working of the inverter unit based on whether the temperature detection unit exists the delivery voltage.

7. An inverter circuit for a solar backpack as claimed in claim 6, wherein, The temperature detection unit comprises: A thermistor is used for detecting the working temperature in the whole circuit in real time, and adjusting the resistance value according to the working temperature; A second voltage dividing unit is electrically connected with the thermistor; A voltage stabilizing element is electrically connected with the thermistor at the input end, and is used for setting the trigger voltage of the protection circuit, and conducting when the voltage delivered by the thermistor exceeds the set trigger voltage; A switching element is electrically connected with the output end of the voltage stabilizing element at the base, and is used for driving the switching element to conduct based on the voltage output by the voltage stabilizing element, and pulling down the voltage delivered by the power supply unit to the ground.

8. An inverter circuit for a solar backpack as defined in claim 1, wherein, Further comprising a USB output circuit, the input end of the USB output circuit is electrically connected with the power supply control circuit, and is used for supplying power for external equipment.

9. An inverter circuit for a solar backpack as defined in claim 1, wherein, Further comprising a TypeC output circuit, the TypeC output circuit is electrically connected with the power supply control circuit, and is used for supplying power for external equipment.

10. An inverter circuit for a solar backpack as defined in claim 1, wherein, Further comprising a power display circuit, the power display circuit is electrically connected with the power supply control circuit, and is used for displaying the current power of the storage battery.

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