A portable modular household power supply

Abstract

The utility model discloses a portable modular household power supply, include: casing, set up in the casing baffle, the baffle divides the internal space of casing into upper chamber, middle layer chamber, lower chamber, the upper chamber is equipped with monocrystal photovoltaic board, LCD liquid crystal display, GPRS communication module, the middle layer chamber is equipped with main control board, MPPT photovoltaic controller, inverter power module, the lower chamber is equipped with battery bank, be equipped with DSP digital processor on the main control board, and the DSP digital processor corresponding end is respectively with MPPT photovoltaic controller, inverter power module, LCD liquid crystal display corresponding end electric connection, the MPPT photovoltaic controller corresponding end is respectively with monocrystal photovoltaic board, battery bank, inverter power module corresponding end electric connection, the LCD liquid crystal display corresponding end still with GPRS communication module corresponding end electric connection.

Description

Technical Field

[0001] This utility model relates to the field of power supply technology, and in particular to a portable modular household power supply. Background Technology

[0002] With the increasing prevalence of renewable energy and the growing demand for portable power sources, residential photovoltaic (PV) power systems play a crucial role in outdoor activities, emergency power supply, and applications in remote areas. However, current residential power systems typically employ an integrated design with a compact internal component layout, leading to poor heat dissipation, severe electromagnetic interference, and a higher risk of malfunctions and shortened equipment lifespan. Furthermore, traditional power systems lack modular structures, requiring complete disassembly for maintenance, which is complex and costly. In addition, most existing power systems lack efficient MPPT (Maximum Power Point Tracking) control and remote communication capabilities, hindering real-time optimization of PV power generation efficiency or cloud-based monitoring. This results in low energy utilization, slow fault response, and an inability to meet modern users' demands for intelligence and portability. These issues limit the reliability and convenience of residential power systems in practical applications. Utility Model Content

[0003] To address the problems existing in the prior art, this utility model provides a portable modular household power supply.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] This utility model provides a portable modular household power supply, including: a housing and a partition disposed inside the housing;

[0006] The partition divides the internal space of the shell into an upper chamber, a middle chamber, and a lower chamber;

[0007] The upper chamber is equipped with a monocrystalline photovoltaic panel, an LCD liquid crystal display screen, and a GPRS communication module;

[0008] The middle chamber is equipped with a main control board, an MPPT photovoltaic controller, and an inverter power module;

[0009] The lower chamber is equipped with a battery pack;

[0010] The main control board is equipped with a DSP digital processor, and the corresponding terminals of the DSP digital processor are electrically connected to the corresponding terminals of the MPPT photovoltaic controller, the inverter power module, and the LCD liquid crystal display screen, respectively.

[0011] The corresponding terminals of the MPPT photovoltaic controller are electrically connected to the corresponding terminals of the monocrystalline photovoltaic panel, the battery pack, and the inverter power module, respectively; the corresponding terminal of the LCD liquid crystal display screen is also electrically connected to the corresponding terminal of the GPRS communication module.

[0012] Preferably, the MPPT photovoltaic controller includes a photovoltaic input circuit, a BUCK circuit, a drive circuit, and a voltage and current sampling circuit;

[0013] The corresponding terminals of the photovoltaic input circuit are electrically connected to the corresponding terminals of the monocrystalline photovoltaic panel and the Buck circuit, respectively.

[0014] The corresponding terminals of the driving circuit are electrically connected to the corresponding terminals of the DSP digital processor and the Buck circuit, respectively.

[0015] The corresponding terminals of the voltage and current sampling circuit are electrically connected to the battery pack and provide sampling signals to the DSP digital processor.

[0016] Preferably, the photovoltaic input circuit includes a common-mode inductor L9, an anti-backflow diode D13, a varistor VR1, capacitors C30, C25, C34, C36, and C27, and resistors R25, R26, R29, R35, R111, and R112.

[0017] The first pin of the common mode inductor L9 is electrically connected to the first terminal of capacitor C30, the first terminal of capacitor C34, and the corresponding terminal of anti-backflow diode D13. The second pin of the common mode inductor L9 is electrically connected to the second terminal of capacitor C30 and the first terminal of capacitor C36 and grounded. The second terminal of capacitor C36 is electrically connected to the second terminal of capacitor C34 and grounded. The third pin of the common mode inductor L9 is electrically connected to the first terminal of resistor R111, the first terminal of varistor VR1, the first terminal of capacitor C27, and the corresponding terminal of BUCK circuit.

[0018] The fourth pin of the common mode inductor L9 is electrically connected to the first end of the resistor R29; the second end of the resistor R111 is electrically connected to the second end of the resistor R29 and the first end of the resistor R35 via resistors R112, R25 and R26 respectively; the second end of the resistor R35 is electrically connected to the first end of the capacitor C25, and the second end of the capacitor C25 is grounded.

[0019] Preferably, the driving circuit includes an optocoupler U7, a transistor Q18, a relay K1, a diode D20, resistors R103, R104, R105, and R106; the first pin of the optocoupler U7 is electrically connected to the corresponding terminal of the DSP digital processor via resistor R106, the second and third pins are grounded, and the fourth pin is electrically connected to the first terminal of resistor R105 and the first terminal of resistor R103, respectively; the second terminal of resistor R105 is connected to a 5V power supply terminal, the second terminal of resistor R103 is electrically connected to the base of transistor Q18 and the first terminal of resistor R104, the emitter of transistor Q18 is electrically connected to the second terminal of resistor R104, the collector of transistor Q18 is electrically connected to the first terminal of diode D20 and the second pin of relay K1, and the second terminal of diode D20 is electrically connected to the first pin of relay K1.

[0020] Preferably, the inverter power module includes an SPWM drive circuit, a DC full-bridge chopper circuit, a boost isolation transformer circuit, a voltage comparator detection circuit, a current limiting and overcurrent protection circuit, and a status indication circuit.

[0021] The corresponding terminals of the DSP digital processor are electrically connected to the corresponding terminals of the SPWM drive circuit and the status indicator circuit, respectively.

[0022] The corresponding terminal of the SPWM drive circuit is electrically connected to the corresponding terminal of the DC full-bridge chopper circuit, and the corresponding terminal of the DC full-bridge chopper circuit is electrically connected to the corresponding terminal of the boost isolation transformer circuit.

[0023] The output terminals of the voltage comparator detection circuit and the current limiting and overcurrent protection circuit are connected together to the shutdown control terminal OFF and electrically connected to the corresponding terminal of the SPWM drive circuit.

[0024] Preferably, the step-up isolation transformer circuit includes a current transformer CT1, an AC output interface CN8, a capacitor C45, a capacitor CY1, a capacitor CY2, a resistor R35, and a resistor R36; the first pin of the current transformer CT1 is electrically connected to the first terminals of capacitors C45 and CY2 respectively, the second terminal of capacitor C45 is electrically connected to the first pin of the AC output interface CN8 and the first terminal of capacitor CY1 respectively; the second terminals of capacitors CY1 and CY2 are both grounded; the third pin of the current transformer CT1 is electrically connected to the first terminals of resistors R36 and R35 respectively, and the fourth pin of the current transformer CT1 is electrically connected to the second terminals of resistors R36 and R35 respectively.

[0025] Preferably, the housing is provided with handle grooves on both sides and support feet at the bottom.

[0026] Preferably, the upper chamber, middle chamber, and lower chamber are each provided with a number of waist-shaped heat dissipation holes.

[0027] The technical solution of this utility model has the following beneficial effects:

[0028] Modular layered design: The shell is divided into upper, middle and lower chambers by partitions, which realizes the compartmentalized arrangement of components, which is conducive to heat dissipation, reduces electromagnetic interference and the risk of accidental contact, facilitates modular assembly and maintenance, and does not require the whole disassembly to replace a single module, thus improving the reliability and service life of the equipment.

[0029] High-efficiency energy management: The integrated MPPT photovoltaic controller can track the maximum power point in real time, optimize photovoltaic power generation efficiency, improve energy utilization, and perfectly and efficiently realize the power conversion of solar panels with a conversion efficiency of over 95%, ensuring that more power is obtained under limited sunlight; combined with a DSP digital processor, it realizes precise charging management and protection functions, extending the service life of the battery pack.

[0030] Intelligent remote monitoring: Equipped with a GPRS communication module and an LCD screen, it supports communication with the cloud or mobile terminals, reports operating data and fault alarms, receives remote control commands, realizes remote monitoring and maintenance, shortens fault response time, improves user experience, and can perform fault self-checks, automatic adjustments and other functions to achieve unattended, safe and stable operation.

[0031] Safety protection mechanism: The inverter power module includes a voltage comparator detection circuit and a current limiting and overcurrent protection circuit, which can detect abnormalities in a timely manner and trigger shutdown to prevent risks such as overvoltage, overcurrent and short circuit, thereby improving the safety and stability of the whole machine.

[0032] Portability and practicality: The casing has handle slots on both sides for easy carrying; the bottom support feet provide stable support; each chamber has waist-shaped heat dissipation holes to further enhance heat dissipation, making it suitable for various scenarios such as outdoor use and emergency situations, and meeting the portability needs of household power supplies.

[0033] High efficiency and energy saving: Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of this utility model;

[0035] Figure 2 This is a schematic diagram of the control principle of this utility model;

[0036] Figure 3 This is the circuit schematic diagram of the MPPT photovoltaic controller of this utility model;

[0037] Figure 4 This is the circuit schematic diagram of the SPWM drive circuit of this utility model;

[0038] Figure 5 This is a circuit diagram of the step-up isolation transformer circuit of this utility model;

[0039] Figure 6 This is a circuit diagram of the status indicator circuit of this utility model;

[0040] Figure 7 This is a circuit diagram of the comparator detection circuit of this utility model;

[0041] Figure 8 This is the circuit diagram of the current limiting and overcurrent protection circuit of this utility model. Detailed Implementation

[0042] The embodiments of this utility model are described in detail below. Examples of these embodiments 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 this utility model, and should not be construed as limiting this utility model.

[0043] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating 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 are not intended to 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.

[0044] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0045] In this utility model, 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 connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0046] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0047] Reference Figures 1 to 8 This utility model provides a portable modular household power supply, including: a housing 1 and a partition disposed inside the housing 1;

[0048] The partition divides the internal space of the shell 1 into an upper chamber 101, a middle chamber 102, and a lower chamber 103, achieving a compartmentalized structural arrangement. This facilitates heat dissipation, reduces mutual interference and the risk of accidental contact, and allows for modular assembly and maintenance, eliminating the need for complete disassembly when replacing individual modules.

[0049] The upper chamber 101 is equipped with a monocrystalline photovoltaic panel 40, an LCD liquid crystal display screen 20, and a GPRS communication module 30. The monocrystalline photovoltaic panel 40 is used to convert light energy into direct current to provide primary energy input for the system. The GPRS communication module 30 can communicate with the cloud / mobile terminal, report operating data and fault alarms, receive remote control / upgrade commands, realize remote monitoring and maintenance, and shorten fault response time.

[0050] The middle chamber 102 is equipped with a main control board, an MPPT photovoltaic controller 50, and an inverter power module;

[0051] The lower chamber 103 is equipped with a battery pack 60;

[0052] The main control board is equipped with a DSP digital processor 10, and the corresponding terminals of the DSP digital processor 10 are electrically connected to the corresponding terminals of the MPPT photovoltaic controller 50, the inverter power module, and the LCD liquid crystal display screen 20, respectively.

[0053] The corresponding terminals of the MPPT photovoltaic controller 50 are electrically connected to the corresponding terminals of the monocrystalline photovoltaic panel 40, the battery pack 60, and the inverter power module, respectively; the corresponding terminal of the LCD liquid crystal display screen 20 is also electrically connected to the corresponding terminal of the GPRS communication module 30.

[0054] Furthermore, the MPPT photovoltaic controller 50 includes a photovoltaic input circuit 501, a BUCK circuit 502, a drive circuit 503, and a voltage and current sampling circuit 504.

[0055] The corresponding terminals of the photovoltaic input circuit 501 are electrically connected to the corresponding terminals of the monocrystalline photovoltaic panel 40 and the Buck circuit 502, respectively; the corresponding terminals of the drive circuit 503 are electrically connected to the corresponding terminals of the DSP digital processor 10 and the Buck circuit 502, respectively; the corresponding terminals of the voltage and current sampling circuit 504 are electrically connected to the battery pack 60 and provide sampling signals to the DSP digital processor 10. The photovoltaic input circuit 501 is connected to the monocrystalline photovoltaic panel, performing polarity / surge / EMI suppression and primary filtering on the input, and providing a relatively smooth and controlled DC input to the subsequent stages; reducing the impact of environmental and load fluctuations on the subsequent stages, avoiding backflow and overvoltage damage; improving electromagnetic compatibility, and increasing the overall reliability and service life; the Buck circuit 502 is used to efficiently step down the photovoltaic side power to the target voltage and current of the DC bus / battery side through switching conversion, realizing charging and power supply; significantly reducing losses compared to linear conversion, improving the efficiency of the power generation-storage link; maintaining bus stability during changes in light intensity and sudden load changes, improving system dynamic response and endurance; the drive circuit 503 receives the PWM control signal output by the DSP digital processor 10, and drives the Buck power switching devices after isolation / shaping / amplification; it supports shutdown gating to cooperate with system protection. It achieves electrical isolation and anti-interference between the control unit and the power unit, ensuring accurate execution of control commands; it can quickly shut down in abnormal conditions, shortening fault clearing time and improving safety; the voltage and current sampling circuit 504 can collect parameters such as voltage and current from the battery and provide them to the DSP digital processor for MPPT optimization, current limiting, charging management and protection criteria. The DSP digital processor can track the maximum power point, limit the charging current, and determine overvoltage / undervoltage states based on real-time data, thereby improving energy utilization and battery life.

[0056] Furthermore, the photovoltaic input circuit 501 includes a common-mode inductor L9, an anti-backflow diode D13, a varistor VR1, capacitors C30, C25, C34, C36, and C27, and resistors R25, R26, R29, R35, R111, and R112.

[0057] The first pin of the common mode inductor L9 is electrically connected to the first terminal of capacitor C30, the first terminal of capacitor C34, and the corresponding terminal of anti-backflow diode D13. The second pin of the common mode inductor L9 is electrically connected to the second terminal of capacitor C30 and the first terminal of capacitor C36 and grounded. The second terminal of capacitor C36 is electrically connected to the second terminal of capacitor C34 and grounded. The third pin of the common mode inductor L9 is electrically connected to the first terminal of resistor R111, the first terminal of varistor VR1, the first terminal of capacitor C27, and the corresponding terminal of BUCK circuit.

[0058] The fourth pin of the common mode inductor L9 is electrically connected to the first end of the resistor R29; the second end of the resistor R111 is electrically connected to the second end of the resistor R29 and the first end of the resistor R35 via resistors R112, R25 and R26 respectively; the second end of the resistor R35 is electrically connected to the first end of the capacitor C25, and the second end of the capacitor C25 is grounded.

[0059] Furthermore, the driving circuit 503 includes an optocoupler U7, a transistor Q18, a relay K1, a diode D20, resistors R103, R104, R105, and R106. The first pin of the optocoupler U7 is electrically connected to the corresponding terminal of the DSP digital processor via resistor R106. The second and third pins are grounded, and the fourth pin is electrically connected to the first terminal of resistor R105 and the first terminal of resistor R103, respectively. The second terminal of resistor R105 is connected to a 5V power supply terminal. The second terminal of resistor R103 is electrically connected to the base of transistor Q18 and the first terminal of resistor R104, respectively. The emitter of transistor Q18 is electrically connected to the second terminal of resistor R104, and the collector of transistor Q18 is electrically connected to the first terminal of diode D20 and the second pin of relay K1, respectively. The second terminal of diode D20 is electrically connected to the first pin of relay K1.

[0060] Furthermore, the inverter power module includes an SPWM drive circuit 70, a DC full-bridge chopper circuit 80, a boost isolation transformer circuit 90, a voltage comparator detection circuit 110, a current limiting and overcurrent protection circuit 120, and a status indicator circuit 100. The corresponding terminals of the DSP digital processor 10 are electrically connected to the corresponding terminals of the SPWM drive circuit 70 and the status indicator circuit 100, respectively. The corresponding terminals of the SPWM drive circuit 70 are electrically connected to the corresponding terminals of the DC full-bridge chopper circuit 80, and the corresponding terminals of the DC full-bridge chopper circuit 80 are electrically connected to the corresponding terminals of the boost isolation transformer circuit 90. The output terminals of the voltage comparator detection circuit 110 and the current limiting and overcurrent protection circuit 120 are connected together to the OFF control terminal and electrically connected to the corresponding terminal of the SPWM drive circuit 70. The SPWM drive circuit 70 receives the SPWM / Hz control signal output by the DSP digital processor and performs isolation, buffering, Schmitt triggering, and gating (OFF). The power stage provides a drive signal with accurate duty cycle / phase and clean edges; when the protection triggers and pulls low to OFF, it can quickly shut down the power stage, reducing fault energy. The DC full-bridge chopper circuit 80, driven by SPWM, modulates the DC bus power into an AC square wave at high frequency / power frequency and outputs it to the transformer primary, efficiently converting DC to AC fundamental frequency, resulting in strong output capability and high efficiency; in conjunction with OFF gating, it can immediately stop the drive in case of abnormality, protecting power devices and the load. The step-up isolation transformer circuit meets the user-side voltage level and safety isolation requirements, improving electrical safety for the load and personnel; the voltage comparator detection circuit 110 promptly issues a protection request when the voltage exceeds the limit abnormally, and together with the current limiting and overcurrent protection, it ORs into OFF to achieve unified shutdown, preventing device breakdown and malfunction. The current limiting and overcurrent protection circuit 120 detects the load current, implementing wave-by-wave current limiting and overcurrent / short-circuit judgment, outputting protection criteria, limiting current in the early stages of overload to prevent temperature rise; triggering shutdown in case of severe overcurrent / short circuit reduces the risk of damage to devices and the transformer, improving overall reliability. The status indicator circuit is used to output multiple indicator outputs (such as high voltage / medium voltage / low voltage / inverter / fault, etc.), providing intuitive prompts in fault scenarios and shortening the location time.

[0061] Furthermore, the step-up isolation transformer circuit 90 includes a current transformer CT1, an AC output interface CN8, a capacitor C45, a capacitor CY1, a capacitor CY2, a resistor R35, and a resistor R36. The first pin of the current transformer CT1 is electrically connected to the first terminals of capacitors C45 and CY2, respectively. The second terminal of capacitor C45 is electrically connected to the first pin of the AC output interface CN8 and the first terminal of capacitor CY1, respectively. The second terminals of capacitors CY1 and CY2 are both grounded. The third pin of the current transformer CT1 is electrically connected to the first terminals of resistors R36 and R35, respectively. The fourth pin of the current transformer CT1 is electrically connected to the second terminals of resistors R36 and R35, respectively.

[0062] Furthermore, the housing 1 is provided with handle grooves 105 on both sides for easy handling, and the bottom of the housing 1 is also provided with support feet. The upper chamber 101, the middle chamber 102, and the lower chamber 103 are all provided with several waist-shaped heat dissipation holes 104 to facilitate heat dissipation and improve the service life of the components inside the housing 1.

[0063] The working principle of this utility model:

[0064] This portable modular household power supply utilizes a modular, layered design to achieve efficient solar energy collection, storage, conversion, and output. Combined with intelligent control and remote monitoring, it ensures a stable and reliable power supply. The overall workflow is as follows:

[0065] 1. Solar Energy Acquisition and Input Processing: The monocrystalline photovoltaic panel, located in the upper chamber, receives solar energy and converts it into DC power. This DC power first enters the photovoltaic input circuit of the MPPT photovoltaic controller. The photovoltaic input circuit, through components such as common-mode inductor L9, anti-backflow diode D13, varistor VR1, capacitors C30, C25, C34, C36, C27, and resistors R25, R26, R29, R35, R111, R112, performs polarity protection, surge suppression, EMI filtering, and primary filtering to ensure a smooth and stable input DC power, prevent reverse current backflow or overvoltage damage, and improve the system's electromagnetic compatibility and reliability.

[0066] 2. Maximum Power Point Tracking (MPPT) and Buck Conversion: The processed DC power enters the BUCK circuit of the MPPT photovoltaic controller, where it undergoes efficient buck conversion under the control of the DSP digital processor. The DSP outputs a PWM signal through a drive circuit (including optocoupler U7, transistor Q18, relay K1, diode D20, and resistors R103, R104, R105, and R106), which is isolated, amplified, and then drives the power switching devices in the BUCK circuit to achieve switching conversion. The voltage and current sampling circuit collects the voltage and current parameters of the battery pack in real time and feeds them back to the DSP digital processor for optimization of the existing MPPT algorithm, charging current limiting, and overvoltage / undervoltage protection. By dynamically adjusting the duty cycle, the system tracks the maximum power point of the photovoltaic panel, improving energy conversion efficiency and transferring electrical energy to the battery pack for storage or directly supplying the inverter power module.

[0067] 3. Energy Storage and Management: The battery pack in the lower chamber acts as an energy buffer, storing the DC power output from the MPPT controller. The DSP digital processor manages charging based on sampled signals, including constant current / constant voltage charging mode switching, current limiting protection, and battery status monitoring, ensuring safe charging of the battery pack and extending its lifespan. In low-light conditions, the battery pack can reverse-power the inverter module for continuous power supply.

[0068] 4. DC-to-AC Inverter Output: The DC power from the battery pack or MPPT enters the inverter power module in the middle chamber. First, the SPWM drive circuit receives the SPWM control signal from the DSP digital processor, isolates, buffers, and shapes it, then drives the DC full-bridge chopper circuit to convert the DC power into a high-frequency or power-frequency AC square wave. Subsequently, the AC square wave is input to the step-up isolation transformer circuit, achieving voltage boosting, electrical isolation, and filtering. Finally, standard AC power is output through the AC output interface for user loads. This circuit provides electrical safety isolation to prevent load-side faults from affecting the system.

[0069] 5. Protection and Status Monitoring: The inverter module integrates a voltage comparator detection circuit and a current-limiting and overcurrent protection circuit to monitor the output voltage and current in real time. When overvoltage, overcurrent, or short-circuit abnormalities are detected, an OFF signal is output to the SPWM drive circuit to quickly shut down the power devices and prevent equipment damage. The status indication circuit outputs indication signals (such as high / low / fault) according to the instructions of the DSPP digital processor, displaying the system operating status on the LCD screen. Simultaneously, the LCD connects to the GPRS communication module for data reporting and remote control: the GPRS module transmits operating parameters and fault alarms to the cloud or mobile terminal, supporting remote monitoring, diagnostics, and firmware upgrades, shortening fault response time.

[0070] 6. Overall System Coordination and Heat Dissipation: The DSP digital processor on the main control board serves as the core, coordinating the interaction between the MPPT controller, inverter module, LCD, and GPRS to ensure efficient energy flow and system stability. The layered housing design facilitates thermal isolation, and each chamber features waist-shaped ventilation holes to promote natural convection heat dissipation, reduce internal temperature, and extend component lifespan. A handle groove and support feet enhance portability and stability, making it suitable for outdoor use.

[0071] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A portable modular household power supply, characterized in that, include: The housing and the partitions located inside the housing; The partition divides the internal space of the shell into an upper chamber, a middle chamber, and a lower chamber; The upper chamber is equipped with a monocrystalline photovoltaic panel, an LCD liquid crystal display screen, and a GPRS communication module; The middle chamber is equipped with a main control board, an MPPT photovoltaic controller, and an inverter power module; The lower chamber is equipped with a battery pack; The main control board is equipped with a DSP digital processor, and the corresponding terminals of the DSP digital processor are electrically connected to the corresponding terminals of the MPPT photovoltaic controller, the inverter power module, and the LCD liquid crystal display screen, respectively. The corresponding terminals of the MPPT photovoltaic controller are electrically connected to the corresponding terminals of the monocrystalline photovoltaic panel, the battery pack, and the inverter power module, respectively; the corresponding terminal of the LCD liquid crystal display screen is also electrically connected to the corresponding terminal of the GPRS communication module.

2. The portable modular household power supply according to claim 1, characterized in that, The MPPT photovoltaic controller includes a photovoltaic input circuit, a BUCK circuit, a drive circuit, and a voltage and current sampling circuit. The corresponding terminals of the photovoltaic input circuit are electrically connected to the corresponding terminals of the monocrystalline photovoltaic panel and the Buck circuit, respectively. The corresponding terminals of the driving circuit are electrically connected to the corresponding terminals of the DSP digital processor and the Buck circuit, respectively. The corresponding terminals of the voltage and current sampling circuit are electrically connected to the battery pack and provide sampling signals to the DSP digital processor.

3. The portable modular household power supply according to claim 2, characterized in that, The photovoltaic input circuit includes a common-mode inductor L9, an anti-backflow diode D13, a varistor VR1, capacitors C30, C25, C34, C36, and C27, and resistors R25, R26, R29, R35, R111, and R112. The first pin of the common mode inductor L9 is electrically connected to the first terminal of capacitor C30, the first terminal of capacitor C34, and the corresponding terminal of anti-backflow diode D13. The second pin of the common mode inductor L9 is electrically connected to the second terminal of capacitor C30 and the first terminal of capacitor C36 and grounded. The second terminal of capacitor C36 is electrically connected to the second terminal of capacitor C34 and grounded. The third pin of the common mode inductor L9 is electrically connected to the first terminal of resistor R111, the first terminal of varistor VR1, the first terminal of capacitor C27, and the corresponding terminal of BUCK circuit. The fourth pin of the common mode inductor L9 is electrically connected to the first end of the resistor R29; the second end of the resistor R111 is electrically connected to the second end of the resistor R29 and the first end of the resistor R35 via resistors R112, R25 and R26 respectively; the second end of the resistor R35 is electrically connected to the first end of the capacitor C25, and the second end of the capacitor C25 is grounded.

4. The portable modular household power supply according to claim 2, characterized in that, The driving circuit includes an optocoupler U7, a transistor Q18, a relay K1, a diode D20, resistors R103, R104, R105, and R106. The first pin of the optocoupler U7 is electrically connected to the corresponding terminal of the DSP digital processor via resistor R106. The second and third pins are grounded, and the fourth pin is electrically connected to the first terminals of resistors R105 and R103, respectively. The second terminal of resistor R105 is connected to a 5V power supply. The second terminal of resistor R103 is electrically connected to the base of transistor Q18 and the first terminal of resistor R104, respectively. The emitter of transistor Q18 is electrically connected to the second terminal of resistor R104. The collector of transistor Q18 is electrically connected to the first terminal of diode D20 and the second pin of relay K1, respectively. The second terminal of diode D20 is electrically connected to the first pin of relay K1.

5. The portable modular household power supply according to claim 1, characterized in that, The inverter power module includes an SPWM drive circuit, a DC full-bridge chopper circuit, a boost isolation transformer circuit, a voltage comparator detection circuit, a current limiting and overcurrent protection circuit, and a status indication circuit. The corresponding terminals of the DSP digital processor are electrically connected to the corresponding terminals of the SPWM drive circuit and the status indicator circuit, respectively. The corresponding terminal of the SPWM drive circuit is electrically connected to the corresponding terminal of the DC full-bridge chopper circuit, and the corresponding terminal of the DC full-bridge chopper circuit is electrically connected to the corresponding terminal of the boost isolation transformer circuit. The output terminals of the voltage comparator detection circuit and the current limiting and overcurrent protection circuit are connected together to the shutdown control terminal OFF and electrically connected to the corresponding terminal of the SPWM drive circuit.

6. The portable modular household power supply according to claim 5, characterized in that, The step-up isolation transformer circuit includes a current transformer CT1, an AC output interface CN8, a capacitor C45, a capacitor CY1, a capacitor CY2, a resistor R35, and a resistor R36. The first pin of the current transformer CT1 is electrically connected to the first terminals of capacitors C45 and CY2, respectively. The second terminal of capacitor C45 is electrically connected to the first pin of the AC output interface CN8 and the first terminal of capacitor CY1, respectively. The second terminals of capacitors CY1 and CY2 are both grounded. The third pin of the current transformer CT1 is electrically connected to the first terminals of resistors R36 and R35, respectively. The fourth pin of the current transformer CT1 is electrically connected to the second terminals of resistors R36 and R35, respectively.

7. The portable modular household power supply according to claim 1, characterized in that, The shell is also provided with handle grooves on both sides and support feet at the bottom.

8. The portable modular household power supply according to claim 1, characterized in that, The upper chamber, middle chamber, and lower chamber are all provided with several waist-shaped heat dissipation holes.

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