Mobile power supply and inverter module circuit

Abstract

The utility model relates to the technical field of mobile power supplies, and provides a mobile power supply and inverter module circuit, and the mobile power supply comprises an MCU module, a power supply system, a screen display module, and an inverter module circuit. The power supply system is electrically connected with the battery module and the MCU module in the shell of the mobile power supply, and is used for obtaining a direct current signal from the battery module, outputting the direct current signal to a direct current load connected to the power supply system for power supply, and transmitting an output state signal of the direct current signal to the MCU module; the screen display module displays the output state of the direct current signal according to the direct current output state display control signal transmitted by the MCU module, the direct current output state display control signal is generated by the MCU module according to the output state signal of the direct current signal, and the user experience is improved; the inverter module circuit outputs an alternating current signal to the alternating current load and stops outputting the alternating current signal to the alternating current load when overload or overcurrent is detected, so that the stability of the mobile power supply is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of mobile power supplies, and in particular to a mobile power supply and inverter module circuit. Background Art

[0002] A mobile power bank, also known as a portable charger, is a portable device used to provide power support for electronic devices such as mobile phones, tablets, smart watches, and cameras in an external environment. Mobile power banks generally include those that support DC charging and discharging and those that support AC / DC charging and discharging. Among them, the mobile power bank that supports AC / DC charging and discharging has a built-in inverter module for connecting to AC mains to charge the battery, or for converting the battery's DC power into AC power to discharge the AC load. Charging and discharging are the basic functions of mobile power banks. In order to meet the diverse needs of mobile power usage, the existing technology integrates a variety of other functions on the basis of the basic functions of mobile power banks. Different mobile power bank manufacturers have different integrated functions, and the circuit structure and performance are also different. However, many mobile power banks are not very stable, and there is a lack of display of the output status of the mobile power banks, which is not conducive to intuitive use by users.

[0003] In summary, existing mobile power supplies have technical problems such as low stability, lack of display of the output status of the mobile power supply, and inconvenience for users to use intuitively. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a mobile power supply and inverter module circuit to improve the stability of the mobile power supply, display the output status of the mobile power supply, and enhance the user's intuitive usage experience.

[0005] In a first aspect, the present invention provides a mobile power supply, comprising an MCU module, a power supply system, a screen display module, and an inverter module circuit. The MCU module is disposed within the housing of the mobile power supply; the power supply system is electrically connected to a battery module and the MCU module within the housing of the mobile power supply, respectively, and is configured to obtain a DC signal from the battery module, output it to a DC load connected to the power supply system, and transmit an output status signal of the DC signal to the MCU module; the screen display module is disposed outside the housing of the mobile power supply, electrically connected to the MCU module, and is configured to display the output status of the DC signal according to a DC output status display control signal transmitted by the MCU module, wherein the DC output status display control signal is generated by the MCU module according to the output status signal of the DC signal; and the inverter module circuit is electrically connected to the battery module, and is configured to output an AC signal to an AC load connected to the inverter module circuit, perform overload or overcurrent detection, and stop outputting the AC signal to the AC load when an overload or overcurrent occurs.

[0006] In the second aspect, the utility model provides an inverter module circuit, which is applied to a mobile power supply, and the inverter module circuit includes a mains detection circuit, a test port isolation current limiting circuit, a bidirectional inverter and an overload or overcurrent detection circuit; the mains detection circuit is connected to the bidirectional inverter and the test port isolation current limiting circuit, and transmits the AC signal to the bidirectional inverter after detecting the AC signal of the mains; the test port isolation current limiting circuit unidirectionally isolates and limits the power test port from the mains detection circuit; the bidirectional inverter is connected to the battery module and the MCU module, and provides an AC signal output port to output the AC signal to power the AC load; the overload or overcurrent detection circuit is connected to the AC signal output port and the bidirectional inverter, and transmits an overload or overcurrent detection signal to the bidirectional inverter, so that the bidirectional inverter stops outputting the AC signal when overloaded or overcurrent occurs.

[0007] Compared with the prior art, the present invention has the following beneficial effects:

[0008] The utility model provides a mobile power supply and inverter module circuit. The mobile power supply includes an MCU module, a power supply system, a screen display module, and an inverter module circuit. The MCU module is arranged inside the housing of the mobile power supply. The power supply system is electrically connected to a battery module and the MCU module inside the housing of the mobile power supply, respectively, and is used to obtain a direct current signal from the battery module, output it to a direct current load connected to the power supply system, and transmit an output status signal of the direct current signal to the MCU module. The screen display module is arranged outside the housing of the mobile power supply and is electrically connected to the MCU module. It is used to display the output status of the direct current signal according to a direct current output status display control signal transmitted by the MCU module. The direct current output status display control signal is generated by the MCU module according to the output status signal of the direct current signal, and displays the output status of the mobile power supply, thereby improving the user's intuitive use experience. The inverter module circuit is electrically connected to the battery module, and is used to output an alternating current signal to the alternating current load connected to the inverter module circuit, and perform overload or overcurrent detection. When an overload or overcurrent occurs, the output of the alternating current signal to the alternating current load is stopped, thereby improving the stability of the mobile power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Some specific embodiments of the present invention will be described in detail in an illustrative and non-restrictive manner with reference to the drawings. The same reference numerals in the drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the drawings:

[0010] Figure 1 This is a schematic diagram of a circuit structure of a mobile power supply according to an embodiment of the utility model;

[0011] Figure 2 This is a circuit structure diagram of the inverter module circuit of an embodiment of the utility model. DETAILED DESCRIPTION

[0012] In order to help those skilled in the art better understand the present invention, the following will provide a clear and complete description of the technical solutions in the embodiments of the present invention, in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present invention.

[0013] Example 1

[0014] See also Figure 1-Figure 2 This embodiment provides a mobile power supply, comprising an MCU module, a power supply system, a screen display module, and an inverter module circuit. The MCU module is disposed within the housing of the mobile power supply; the power supply system is electrically connected to the battery module and the MCU module within the housing of the mobile power supply, respectively, for obtaining a DC signal from the battery module, outputting it to a DC load connected to the power supply system, and transmitting an output status signal of the DC signal to the MCU module; the screen display module is disposed outside the housing of the mobile power supply, electrically connected to the MCU module, and displaying the output status of the DC signal according to a DC output status display control signal transmitted by the MCU module, wherein the DC output status display control signal is generated by the MCU module according to the output status signal of the DC signal; the inverter module circuit is electrically connected to the battery module, and outputs an AC signal to the AC load connected to the inverter module circuit, performs overload or overcurrent detection, and stops outputting the AC signal to the AC load when an overload or overcurrent occurs.

[0015] It should be noted that in this embodiment, the inverter module circuit has an overload or overcurrent detection function. When the AC load connected to the mobile power supply experiences an overload or overcurrent, the inverter module can promptly detect the anomaly and stop supplying power to the AC load, thereby improving the stability of the mobile power supply during use, preventing circuit damage or equipment failure caused by overcurrent or overload, and enhancing the safety and reliability of the device. When supplying power to the AC load, the inverter module is responsible for inverting the DC power signal provided by the battery module (such as a battery pack) into an AC power signal. If an overcurrent or overload condition is detected, the inverter module will actively cut off the power supply to avoid failures caused by excessive current. In addition, in this embodiment, the mobile power supply includes an MCU module (microcontroller unit) and a screen display module. The MCU module is the core control unit of the entire mobile power supply. It is responsible for receiving and processing electrical signals from the power supply system and converting these signals into status information that can be displayed. The power supply system is electrically connected to the battery module and the DC load and is responsible for managing the DC power output of the battery. It also monitors the output status of the DC signal and transmits the status signal to the MCU module for processing. The screen display module is electrically connected to the MCU module and is used to display the status of the DC power output processed by the MCU. The screen display module allows users to intuitively understand important information such as the power bank's current output status, charge and discharge status, and remaining battery life. This allows users to more easily understand the device's operating status, thereby improving the power bank's user experience. The specific structures of the power supply system, MCU module, and screen display module are conventional in the art and are not detailed in this embodiment.

[0016] In some preferred embodiments, the inverter module circuit is also used to connect to the mains power, and after detecting that the mains power is connected, it works in a charging state to charge the battery module. It should be noted that the main function of the inverter module is to invert DC power into AC power to supply AC loads. However, when the inverter module has the mains power connection detection and charging functions, the mobile power supply is not only a device that provides power support for external devices, it can also reversely charge its own battery module through the mains power, thereby increasing the flexibility of the device. When the mains power is detected, the inverter module can switch to a charging state and use the mains power to supplement the power of the internal battery module.

[0017] In some preferred embodiments, the power bank further comprises a key module, the key module including an AC switch; the AC switch is disposed externally of the power bank housing and electrically connected to the MCU module, which is in turn electrically connected to the inverter module circuit; when the inverter module circuit is connected to the mains and operates in a charging state, the MCU module receives an AC discharge signal triggered by pressing the AC switch, and transmits a UPS state operation control signal to the inverter module circuit, thereby controlling the inverter module circuit to operate in a UPS state and outputting an AC power signal to supply power to the AC load. It should be noted that by disposing the AC switch externally to the power bank, the user can directly control the inverter module's operating state through simple keystrokes. Compared to automatic control or reliance on external signals, the key module provides a more intuitive and user-friendly interaction method, helping to improve the ease of use of the power bank. In UPS (uninterruptible power supply) mode, the power bank can quickly switch to battery power in the event of a mains power outage, ensuring uninterrupted power supply to the AC load and ensuring continuous power supply for devices that require a stable power supply. Controlling the inverter module to enter UPS mode via the MCU module effectively improves the safety and stability of the power bank system. When the utility power is disconnected or fails, the UPS status can ensure the stability of the power supply and prevent power outages from damaging the equipment.

[0018] In some preferred embodiments, the MCU module and the inverter module circuit are electrically connected via a CAN communication line, an RS485 communication line, or a UART communication line. It should be noted that the MCU and the inverter module are electrically connected via CAN, RS485, or UART communication lines, allowing for selection of an appropriate communication method based on different application scenarios. CAN offers high reliability and anti-interference capabilities, making it suitable for complex electromagnetic environments; RS485 supports long-distance transmission, making it suitable for industrial scenarios; and UART, with its low cost and simplicity, meets short-distance communication needs.

[0019] In some preferred embodiments, the power supply system is connected to the DC load via a DC-DC module; the DC-DC module is electrically connected to the MCU module and is configured to perform DC-DC processing on the DC signal provided by the power supply system before outputting power to the DC load. It should be noted that a DC-DC module (DC-DC converter module) can convert one DC voltage to another, typically with a step-up or step-down function. The battery in a mobile power supply typically provides a fixed DC voltage, but different DC loads may require different voltage ranges. The voltage conversion performed by the DC-DC module ensures that the load receives a stable, suitable voltage, thereby improving system efficiency. For example, some devices may require 5V power, while others may require 12V or higher. By converting the battery voltage to a voltage suitable for the load, the DC-DC module ensures stable power supply and prevents voltage mismatches from affecting the normal operation of the load. Furthermore, the DC-DC module includes a voltage stabilization circuit to ensure that the voltage output to the DC load remains within a certain range, preventing voltage fluctuations from affecting the load device.

[0020] In some preferred embodiments, the power supply system is electrically connected to the LED lighting module and to a USB load via a USB module; the LED lighting module and the USB module are each electrically connected to the MCU module. Furthermore, the power bank also includes a Wi-Fi module, a Bluetooth module, a voice module, and an MPPT module; the Wi-Fi module, the Bluetooth module, the voice module, and the MPPT module are each electrically connected to the MCU module. The MPPT module is configured to receive photovoltaic input, convert it into electrical energy, and store it in the battery module. It should be noted that in this embodiment, by electrically connecting the power supply system to the LED lighting module, the power bank not only has basic power storage and output functions but also provides lighting. Connecting a USB load via the USB module allows charging devices such as mobile phones, tablets, and cameras. The Wi-Fi module enables the power bank to connect to external network devices for remote control, monitoring, and communication. The Bluetooth module allows the power bank to pair with devices such as mobile phones and tablets via Bluetooth, allowing users to directly control and manage the power bank via a local Bluetooth connection. The voice module allows the power bank to be operated via voice commands, reducing the need for manual operation. The MPPT (Maximum Power Point Tracking) module receives photovoltaic input and converts it into DC power, which is then stored in the battery module. The MPPT module dynamically adjusts operating parameters based on lighting conditions, ensuring that the solar panel can achieve maximum power output in all environments, allowing the mobile power bank to fully utilize solar energy for charging in outdoor environments.

[0021] Example 2

[0022] See also Figure 1-Figure 2 This embodiment provides an inverter module circuit, which is applied to a mobile power supply (for example, the inverter module circuit can be applied to the mobile power supply in any of the above embodiments). The inverter module circuit includes a mains detection circuit, a test port isolation and current limiting circuit, a bidirectional inverter, and an overload or overcurrent detection circuit; the mains detection circuit is connected to the bidirectional inverter and the test port isolation and current limiting circuit, and transmits the AC signal to the bidirectional inverter after detecting the AC signal of the mains; the test port isolation and current limiting circuit unidirectionally isolates and limits the current of the power test port from the mains detection circuit; the bidirectional inverter is connected to a battery module (such as a battery pack) and an MCU module, and provides an AC signal output port to output the AC signal to power an AC load; the overload or overcurrent detection circuit is connected to the AC signal output port and the bidirectional inverter, and transmits an overload or overcurrent detection signal to the bidirectional inverter, so that the bidirectional inverter stops outputting the AC signal when overloaded or overcurrent occurs. It should be noted that, in this embodiment, the AC power detection circuit ensures that when the AC power is available, the mobile power supply can effectively use the AC power for charging or power supply. The test port isolation current limiting circuit can unidirectionally isolate the power test port from the AC power detection circuit and limit the current inflow to prevent circuit damage or overheating problems caused by excessive current. The bidirectional inverter has bidirectional working capabilities and can convert DC power into AC power for use by the load; it can also work in reverse and use the AC power for charging. The overload or overcurrent detection circuit monitors the AC signal output port, and when an overload or overcurrent is detected, it sends a detection signal to the bidirectional inverter, requiring it to stop output, avoid damage to the equipment, and improve the stability of the mobile power supply. In addition, the specific structure of the AC power detection circuit is a conventional technology in this field and will not be described in detail in this embodiment.

[0023] In some preferred embodiments, the test port isolation and current-limiting circuit includes a diode D1 and a current-limiting resistor R1; the anode of diode D1 is connected to the mains detection circuit, and the cathode of diode D1 is connected to the power test port via current-limiting resistor R1. It should be noted that diode D1 acts as a unidirectional conductor in the circuit. It ensures that current between the mains detection circuit and the power test port can only flow in a single direction. This unidirectional isolation protection mechanism effectively prevents signals from the power test port (such as the insertion signal) from reversely entering the mains detection circuit, thereby avoiding potential electrical interference or reverse current damage to the mains detection circuit. Current-limiting resistor R1 limits the current flowing through the power test port in the circuit. This ensures that the power test port is not damaged or the function of the mains detection circuit is not affected by excessive current. The combined design of diode D1 and current-limiting resistor R1 ensures electrical isolation between the power test port and the mains detection circuit. The current-limiting resistor reduces the impact of current fluctuations, thereby improving signal stability and test accuracy at the power test port. Both diodes and current-limiting resistors are very common and simple electronic components, low-cost, and easy to implement. This combination design ensures circuit safety without significantly increasing system complexity or cost. The simple series connection of diode D1 and resistor R1 effectively implements multiple functions, including isolation, current limiting, and protection.

[0024] In some preferred embodiments, the overload or overcurrent detection circuit includes a resistor R2, a resistor R3, a resistor R4, an op amp U1, a resistor R5, a resistor R6, a resistor R7, a diode D2, and a capacitor C1; resistor R2 is connected to the AC signal output port of the bidirectional inverter and is connected to the non-inverting input terminal of the op amp U1 through resistor R3, and the non-inverting input terminal of the op amp U1 is also connected to the reference voltage VREF+ through resistor R4; the inverting input terminal of the op amp U1 is grounded through resistor R5 and connected to one end of a parallel unit of resistor R6 and capacitor C1, the other end of the parallel unit of resistor R6 and capacitor C1 is connected to the output terminal of the op amp U1 and the first end of resistor R7, and the second end of resistor R7 is connected to the bidirectional inverter through diode D2. It should be noted that resistor R2 is connected to the AC signal output port of the bidirectional inverter and introduces a portion of the AC signal into the detection circuit through voltage division to perform overload or overcurrent detection. Resistor R3 is connected to the non-inverting input of op amp U1. Together with R2, R3 forms a voltage divider, regulating the input signal voltage to ensure it remains within the op amp's operating range. Resistor R4 connects a reference voltage, VREF+, to the non-inverting input of op amp U1. This reference voltage sets a reference level for comparison with the input signal. Reference voltage VREF+ is typically set to a stable voltage based on system requirements to determine the maximum allowable current or voltage. When the input signal (the voltage obtained via resistors R2 and R3) exceeds the reference voltage, it indicates an overload or overcurrent condition, and the op amp outputs the corresponding signal. Op amp U1 compares the input signal with the reference voltage and outputs the amplified difference signal. The op amp's non-inverting input receives the AC signal processed by resistor R3, while its inverting input is connected to ground via resistor R5 and to the parallel combination of R6 and capacitor C1, forming the feedback network. Op amp U1 compares the voltages at its non-inverting and inverting inputs. When the input AC signal voltage exceeds the reference voltage, op amp U1 outputs a high-level signal, indicating that the current or voltage has exceeded the set threshold, triggering protection. Resistor R5 connects the op amp's inverting input to ground, ensuring the voltage at the inverting terminal is zero, allowing the op amp's output to accurately reflect changes in the input signal. The parallel combination of resistor R6 and capacitor C1 forms a feedback network that stabilizes the op amp's operation, prevents high-frequency noise interference, and, in some cases, adjusts the circuit's time response. Resistor R6 provides linear feedback, controlling the op amp's gain and limiting the circuit's amplification factor to prevent over-amplification. Capacitor C1 provides frequency compensation, eliminating high-frequency noise and ensuring stable operation of the op amp. Capacitor C1 also adjusts the circuit's response speed to prevent false detection. Resistor R7, connected to the op amp's output, limits the current flowing from the op amp's output to the bidirectional inverter. Resistor R7 protects against excessive output current, preventing unnecessary impact on subsequent circuits.Diode D2 protects the input of the bidirectional inverter module, preventing the op amp output signal from flowing back into the inverter and generating reverse current. Diode D2's unidirectional conduction ensures that only when an overload or overcurrent condition occurs can the signal flow from the op amp to the inverter, triggering the inverter to shut down.

[0025] It should be pointed out that the above embodiments are only preferred specific implementation methods of the present invention, and the protection scope of the present invention is not limited thereto. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed in the present invention should be covered by the protection scope of the present invention.

Claims

1. A mobile power supply, characterized in that: include: The MCU module is arranged inside the housing of the mobile power supply; a power supply system electrically connected to the battery module and the MCU module inside the housing of the mobile power supply, respectively, for obtaining a DC signal from the battery module, outputting it to a DC load connected to the power supply system, and transmitting an output status signal of the DC signal to the MCU module; a screen display module, disposed outside the housing of the mobile power supply and electrically connected to the MCU module, for displaying the state of the DC power signal output according to a DC output state display control signal transmitted by the MCU module, wherein the DC output state display control signal is generated by the MCU module according to the output state signal of the DC power signal; The inverter module circuit is electrically connected to the battery module, and is used to output an AC signal to the AC load connected to the inverter module circuit, and perform overload or overcurrent detection, and stop outputting the AC signal to the AC load when an overload or overcurrent occurs.

2. The mobile power supply according to claim 1, wherein: The inverter module circuit is further configured to be connected to the mains power supply, and to operate in a charging state to charge the battery module after detecting that the mains power supply is connected.

3. The mobile power supply according to claim 2, wherein: Also includes: A key module, the key module including an AC switch; the AC switch is arranged outside the housing of the mobile power supply and is electrically connected to the MCU module, and the MCU module is electrically connected to the inverter module circuit; the inverter module circuit is connected to the mains and operates in a charging state. When the MCU module receives an AC discharge signal triggered by pressing the AC switch, the MCU module sends a UPS state operation control signal to the inverter module circuit, controls the inverter module circuit to operate in a UPS state, and outputs an AC signal to power the AC load.

4. The mobile power supply according to claim 3, wherein: The MCU module is electrically connected to the inverter module circuit via a CAN communication line, or via an RS485 communication line, or via a UART communication line.

5. The mobile power supply according to claim 3, wherein: The power supply system is connected to the DC load through a DC-DC module; the DC-DC module is electrically connected to the MCU module, and is used to perform DC-DC processing on the DC signal provided by the power supply system and output it to power the DC load.

6. The mobile power supply according to claim 3, wherein: The power supply system is electrically connected to the LED lighting module and is electrically connected to the USB load through the USB module; the LED lighting module and the USB module are electrically connected to the MCU module respectively.

7. The mobile power supply according to claim 3, wherein: It also includes a WIFI module, a Bluetooth module, a voice module and an MPPT module; the WIFI module, the Bluetooth module, the voice module and the MPPT module are electrically connected to the MCU module respectively, and the MPPT module is used to receive photovoltaic input and convert it into electrical energy, and store it in the battery module.

8. An inverter module circuit, characterized in that: The inverter module circuit is applied to a mobile power supply, and the inverter module circuit includes a mains detection circuit, a test port isolation and current limiting circuit, a bidirectional inverter, and an overload or overcurrent detection circuit; the mains detection circuit is connected to the bidirectional inverter and the test port isolation and current limiting circuit, and transmits the AC signal to the bidirectional inverter after detecting the AC signal of the mains; the test port isolation and current limiting circuit unidirectionally isolates and limits the power test port from the mains detection circuit; the bidirectional inverter is connected to the battery module and the MCU module, and provides an AC signal output port to output the AC signal to power the AC load; the overload or overcurrent detection circuit is connected to the AC signal output port and the bidirectional inverter, and transmits an overload or overcurrent detection signal to the bidirectional inverter, so that the bidirectional inverter stops outputting the AC signal when overloaded or overcurrent occurs.

9. The inverter module circuit according to claim 8, characterized in that: The test port isolation current limiting circuit includes a diode D1 and a current limiting resistor R1; the anode of the diode D1 is connected to the mains detection circuit, and the cathode of the diode D1 is connected to the power test port through the current limiting resistor R1.

10. The inverter module circuit according to claim 8, wherein: The overload or overcurrent detection circuit includes a resistor R2, a resistor R3, a resistor R4, an operational amplifier U1, a resistor R5, a resistor R6, a resistor R7, a diode D2 and a capacitor C1; the resistor R2 is connected to the AC signal output port of the bidirectional inverter and is connected to the non-inverting input terminal of the operational amplifier U1 through the resistor R3, and the non-inverting input terminal of the operational amplifier U1 is also connected to the reference voltage VREF+ through the resistor R4; the inverting input terminal of the operational amplifier U1 is grounded through the resistor R5 and connected to one end of the parallel unit of the resistor R6 and the capacitor C1, the other end of the parallel unit of the resistor R6 and the capacitor C1 is connected to the output terminal of the operational amplifier U1 and the first end of the resistor R7, and the second end of the resistor R7 is connected to the bidirectional inverter through the diode D2.

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