A multifunctional portable power distribution box and its usage method

Abstract

This invention discloses a multifunctional portable power distribution box and its usage method, belonging to the field of power management and power distribution protection technology. The box includes: S1, setting up an intelligent power distribution host, wherein the intelligent power distribution host comprises a sealed metal shell separating an upper sensing and analysis compartment and a lower power execution compartment; a main controller and a high-frequency electrical parameter sensor are installed in the sensing and analysis compartment, and a multi-channel solid-state relay array is installed in the power execution compartment; S2, the main controller estimates the load components online and constructs a load profile, wherein the AC cycle is locked by the voltage zero-crossing point collected by the high-frequency electrical parameter sensor, and the instantaneous power curve within the cycle is calculated. This invention can identify the type of connected load, and based on the power contribution of the instantaneous power curve in the in-phase power region, the lagging power region, and the peak impact region, the proportions of resistive, inductive, and nonlinear components of the load are calculated in reverse, providing a basis for customized protection strategies.

Description

Technical Field

[0001] This invention relates to the fields of power management and power distribution protection, specifically to a multifunctional portable distribution box and its usage method. Background Technology

[0002] With the continuous development of modern power distribution system loads, the limitations of traditional power distribution protection devices are becoming increasingly apparent. These limitations bring about many problems, especially in terms of adaptability to different types of loads. Currently, traditional power distribution protection devices typically use fixed current thresholds and time delay settings, and their protection strategies are incompatible with the electrical characteristics of the load itself, lacking the ability to identify the specific type of connected load. This may lead to the following problems:

[0003] Misjudgment of inductive loads: Traditional protection devices are difficult to adapt to the instantaneous inrush current generated by inductive loads such as motors during startup. They may mistakenly identify normal starting current as overload or short circuit fault, thus unnecessarily disconnecting the circuit.

[0004] Insufficient response to nonlinear loads: Traditional protection devices may not respond adequately to nonlinear inrush currents caused by equipment such as switching power supplies, failing to provide timely and effective protection.

[0005] While these traditional methods of manually setting and fixing thresholds can achieve basic circuit protection, their adaptability is limited. They cannot be dynamically adjusted according to load characteristics, making it difficult to ensure the continuity and safety of different types of loads.

[0006] Therefore, how to improve the adaptability of power distribution protection devices to different loads and avoid misjudgment and insufficient response has become an urgent problem to be solved in this field.

[0007] The information disclosed in the background section above is only intended to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0008] The purpose of this invention is to provide a multifunctional portable power distribution box and its usage method to solve the problems mentioned in the background art.

[0009] The technical solution of the present invention includes:

[0010] S1. An intelligent power distribution host is set up, wherein the intelligent power distribution host includes a sealed metal shell that is divided into an upper sensing and analysis compartment and a lower power execution compartment; a main controller and a high-frequency electrical parameter sensor are set up in the sensing and analysis compartment, and a multi-channel solid-state relay array is set up in the power execution compartment;

[0011] S2. The main controller estimates the load components online and constructs a load profile. The AC cycle is locked by the voltage zero-crossing point collected by the high-frequency electrical parameter sensor, and the instantaneous power curve within the cycle is calculated. Based on the power contribution of the instantaneous power curve in the in-phase power region, the lagging power region, and the peak impact region, the proportions of resistive, inductive, and nonlinear components of the load are deduced in reverse.

[0012] Power contribution is the result of the main controller performing interval integration on the instantaneous power curve. It directly quantifies the power performance of the load under characteristic states such as pure active power, reactive power hysteresis, and nonlinear impact, and is the quantitative basis for determining customized protection strategies.

[0013] S3. The main controller dynamically synthesizes a customized virtual tripping curve based on the proportion of the load components. The current threshold of the long-delay overload protection section of the virtual tripping curve is linearly adjusted upward based on the total proportion of resistive and inductive components from a base value. Its short-circuit instantaneous protection section is triggered based on the rate of change of current over time. Furthermore, in order to adapt to the starting impact current magnitude and duration of motor-type loads, the threshold is gradually relaxed based on the proportion of inductive components.

[0014] S4. When the protection strategy of any output circuit is triggered, the main controller drives the corresponding solid-state relay in the multi-channel solid-state relay array to cut off the circuit, and marks the icon of the fault circuit in red in a graphical way on the human-machine interface panel, and at the same time lights up the indicator light above the physical socket corresponding to the fault circuit in red.

[0015] Preferably, when a new load is connected, it also includes:

[0016] The main controller executes the online profile construction process and estimates the stable operating power of the new load based on historical records or records after stable operation.

[0017] The stable operating power is added to the total power of all currently connected loads. If the predicted total power exceeds the safety threshold, an early warning is issued through the human-machine interface panel, and the load with the highest current power is highlighted.

[0018] Preferably, step S4 is followed by:

[0019] Based on the reason for triggering the protection strategy, the main controller displays user-friendly guided operation instructions on the human-machine interface panel.

[0020] Preferably, in step S2:

[0021] The proportion of inductive component is determined based on the ratio of the cumulative reactive power in the lag power region to the total apparent power.

[0022] The proportion of nonlinear components is determined by comparing the peak value of the rate of change of the current waveform in the peak impact zone with a preset benchmark value, and by weighting the result of the excess part and the ratio of the total active power.

[0023] The proportion of resistive component is determined based on the ratio of the remaining pure resistive power consumption to the total active power after subtracting the power consumed by the nonlinear component from the cumulative power in the in-phase power region.

[0024] Preferably, the high-frequency electrical parameter sensor is a combination of a Hall effect current sensor and a voltage divider resistor voltage sensor, with one set independently configured on each output circuit.

[0025] Preferably, the main controller is connected to the multi-channel solid-state relay array in the power execution compartment via an opto-isolator.

[0026] A multi-functional portable power distribution box, comprising:

[0027] The intelligent power distribution host includes a sealed metal shell that is divided into an upper sensing and analysis compartment and a lower power execution compartment;

[0028] The main controller is located inside the sensing and analysis cabin;

[0029] A high-frequency electrical parameter sensor is installed inside the sensing and analysis chamber and is electrically connected to the main controller;

[0030] A multi-channel solid-state relay array is disposed in the power execution compartment and electrically connected to the main controller;

[0031] A human-machine interface panel is located on the front shell of the intelligent power distribution host and is electrically connected to the main controller;

[0032] The output circuit interface is located on the front casing of the intelligent power distribution host, and each output circuit interface is connected in series with one of the solid-state relays in the multi-channel solid-state relay array.

[0033] Preferably, the multi-channel solid-state relay array is uniformly mounted on an aluminum substrate with heat dissipation fins, and the substrate serves as the rear wall of the power execution compartment.

[0034] Preferably, the output circuit interface is a combination of multiple national standard power sockets, each socket is equipped with a ring indicator light, and the ring indicator light corresponds one-to-one with the circuit information displayed on the human-machine interface panel.

[0035] This invention provides a multifunctional portable power distribution box and its usage method through improvements, which have the following improvements and advantages compared with the prior art:

[0036] 1. This invention can identify the type of connected load and, based on the power contribution of the instantaneous power curve in the in-phase power region, the lagging power region, and the peak impulse region, reversely calculate the proportion of resistive, inductive, and nonlinear components of the load, providing a basis for customized protection strategies.

[0037] 2. Because the current threshold of the long-delay overload protection section can be dynamically adjusted according to the total proportion of resistive and inductive components, this invention enables the protection strategy to match the load characteristics, thereby improving the accuracy of overload judgment. To adapt to motor starting impact, the magnitude and duration of the starting impact current are relaxed in a stepwise manner according to the proportion of inductive components, effectively avoiding misjudgment and disconnection of motor-type loads; it avoids overall power supply interruption due to exceeding the total power limit when new equipment is connected, ensuring the continuity of critical equipment operation. When the predicted total power exceeds the safety threshold, the main controller issues an early warning and highlights the load with the highest current power consumption, giving operators the opportunity to actively adjust the load.

[0038] 3. This invention lowers the professional threshold for troubleshooting. The main controller displays user-friendly guided operation instructions and graphical fault location information on the human-machine interface panel based on the specific cause of the protection trigger, such as prolonged slight overload or instantaneous high current surge. Attached Figure Description

[0039] The present invention will be further explained below with reference to the accompanying drawings and embodiments:

[0040] Figure 1 This is a schematic diagram of the front and back structure of the distribution box;

[0041] Figure 2 This is a structural diagram of the perception and analysis module and the power execution module;

[0042] Figure 3 This is a schematic diagram of the connection structure between a high-frequency electrical parameter sensor and a multi-channel solid-state relay array.

[0043] Figure 4 This is a schematic diagram of the process flow of the method of the present invention.

[0044] In the diagram: 100, Sensing and Analysis Cabin; 110, High-Frequency Electrical Parameter Sensor; 120, Main Controller; 130, Human-Machine Interface Panel; 200, Power Execution Cabin; 210, Multi-Channel Solid-State Relay Array; 220, Output Circuit Interface. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0046] Example 1:

[0047] Please see Figures 1-4 This invention provides a method for using a multifunctional portable power distribution box, comprising:

[0048] S1. Set up an intelligent power distribution host, wherein the intelligent power distribution host includes a sealed metal shell that is divided into an upper sensing and analysis compartment 100 and a lower power execution compartment 200; a main controller 120 and a high-frequency electrical parameter sensor 110 are set in the sensing and analysis compartment 100, and a multi-channel solid-state relay array 210 is set in the power execution compartment 200.

[0049] S2. The main controller 120 estimates the load components and constructs a load profile online. The AC cycle is locked by the voltage zero-crossing point collected by the high-frequency electrical parameter sensor 110, and the instantaneous power curve within the cycle is calculated. Based on the power contribution of the instantaneous power curve in the in-phase power region, the lagging power region, and the peak impact region, the proportion of resistive, inductive, and nonlinear components of the load is deduced in reverse.

[0050] Power contribution is the result of the main controller 120 performing interval integration on the instantaneous power curve. It directly quantifies the power performance of the load under characteristic states such as pure active power, reactive power hysteresis, and nonlinear impact, and is the quantitative basis for determining customized protection strategies.

[0051] S3, the main controller 120 dynamically synthesizes a customized virtual trip curve based on the proportion of load components. The current threshold of the long-delay overload protection part of the virtual trip curve is linearly adjusted upward based on the total proportion of resistive and inductive components from a base value. Its short-circuit instantaneous protection part is triggered based on the rate of change of current over time. In addition, in order to adapt to the starting impact current magnitude and duration of motor loads, the threshold is relaxed in a stepwise manner based on the proportion of inductive components.

[0052] S4. When the protection strategy of any output circuit is triggered, the main controller 120 drives the corresponding solid-state relay in the multi-channel solid-state relay array 210 to cut off the circuit, and marks the icon of the fault circuit in red on the human-machine interface panel 130 in a graphical way, while lighting up the indicator light above the physical socket corresponding to the fault circuit in red.

[0053] In one embodiment of the present invention, traditional power distribution protection devices typically employ fixed current thresholds and delay settings, making it impossible to identify the specific type of connected load. This may lead to misjudgment of the starting current of inductive loads such as motors, resulting in circuit disconnection, or insufficient response to nonlinear inrush currents caused by switching power supplies, limiting the adaptability of the protection. This method, by setting up an intelligent power distribution host, physically separates the components responsible for precision sensing and calculation from those responsible for large current switching, namely, the upper sensing and analysis compartment 100 and the lower power execution compartment 200. The main controller 120 within the sensing and analysis compartment 100 can specifically be an STM32F4 series microprocessor, which works in conjunction with the high-frequency electrical parameter sensor 110 to continuously monitor the circuit status.

[0054] The main controller 120 needs to run an integrated high-frequency instantaneous data analysis algorithm, including an interval integration module for instantaneous power curves, a real-time waveform distortion detection module, and a protection parameter dynamic mapping module based on load profile, to ensure accurate identification and protection of various load characteristics.

[0055] The main controller 120 can identify whether the connected device is resistive, inductive, or nonlinear by estimating the load composition online and building a load profile. Based on this profile, the main controller 120 can dynamically synthesize a customized virtual tripping curve, so that the protection strategy matches the load characteristics.

[0056] The logic for generating this customized virtual trip curve includes the following: For long-delay overload protection, the current threshold is linearly adjusted upwards based on a base value, such as 1.2 times the rated current, according to the total proportion of resistive and inductive components. One implementation is that the final threshold is equal to the base value multiplied by an adjustment coefficient, which is positively correlated with the total proportion of resistive and inductive components; for example, the coefficient increases by 0.05 for every 10% increase in the total proportion.

[0057] In practical applications, the threshold adjustment uses a refined, non-linear adjustment function or stores a detailed lookup table to ensure that the long delay protection threshold is precisely matched with the load safe operation characteristics under different combinations of resistive and inductive components.

[0058] To accommodate the inrush current during the starting of motor-type loads, the allowable magnitude and duration of the inrush current are relaxed in a stepwise manner based on the proportion of inductive component. For example, the main controller 120 internally stores a lookup table. When the proportion of inductive component is detected to be between 20% and 40%, an inrush current of 3 times the rated current is allowed for 50 milliseconds; when the proportion is between 40% and 60%, an inrush current of 4 times the rated current is allowed for 80 milliseconds.

[0059] The main controller 120 stores a complete and repeatedly verified graded relaxation lookup table corresponding to the proportion of inductive component and the allowable size and duration of inrush current. This table covers the starting characteristics of all typical motor loads that are expected to be connected to the distribution box.

[0060] When the protection strategy is triggered, the main controller 120 drives the multi-channel solid-state relay array 210 in the power execution compartment 200 to perform a disconnection action, and provides clear fault location information through the human-machine interface panel 130 and physical indicator lights, thereby improving the accuracy of the entire power distribution protection process and the convenience of user operation.

[0061] This also includes the following when new load is connected:

[0062] The main controller 120 executes the online profile building process and estimates the stable operating power of the new load based on historical records or records after stable operation.

[0063] The stable operating power is added to the total power of all currently connected loads. If the predicted total power exceeds the safety threshold, an early warning is issued through the human-machine interface panel 130, and the load with the highest current power is highlighted.

[0064] To avoid power outages due to exceeding the total power limit when adding new devices, the main controller 120 executes a predictive power allocation process when a new load is connected. The main controller 120 performs an online profile building process to identify the type of the newly connected load. It queries internally stored historical data for records with similar load profiles. If found, it uses the average stable operating power of these records as the estimated power for the new load. Here, the determination of similar load profiles has clear quantitative standards. One non-restrictive method is that when the absolute difference between the resistive, inductive, and nonlinear component percentages analyzed from the newly connected load and the percentages of the three components corresponding to a record in the historical database is less than a preset threshold, for example, less than 5 percentage points, the main controller 120 determines that the two profiles are similar.

[0065] The actual similarity determination uses a weighted distance metric method, which assigns different weights to resistive, inductive, and nonlinear components and comprehensively evaluates their differences from historical records in order to more reliably determine the type of load and operating power.

[0066] If no similar record is found in the database, the main controller 120 will record the power data of the new load as a new historical entry after the new load has been running stably for a preset period of time. After obtaining the estimated power, the main controller 120 will add it to the power of all other running loads to obtain the predicted total power. This predicted total power will be compared with the total rated input power of the distribution box. If the predicted value exceeds the set safety threshold, the main controller 120 will not immediately cut off the power, but will display a warning message through the human-machine interface panel 130, such as a 5-inch color LCD touch screen, and highlight the one or several loads with the highest current power consumption. The purpose of this processing method is to give operators the opportunity to actively adjust the load, such as removing unnecessary equipment to avoid a complete power outage, thus ensuring the continuity of operation of critical equipment.

[0067] Step S4 is followed by:

[0068] Based on the reason for triggering the protection strategy, the main controller 120 displays user-friendly guided operation instructions on the human-machine interface panel 130.

[0069] To lower the technical barrier to troubleshooting, the main controller 120 provides guided operation instructions when the protection of any circuit is triggered. The main controller 120 generates different prompts based on the specific reason for the protection trigger, such as a prolonged minor overload or a sudden large current surge. This information is directly displayed on the human-machine interface panel 130. If a circuit exceeds its rated power for an extended period, the panel may display: "Socket #3 has excessive power; consider replacing or removing it." If the high-frequency electrical parameter sensor 110 detects severe and irregular current fluctuations, indicating a short circuit, the panel will display: "Warning: Socket #2 may be damaged; unplug and inspect immediately." In this way, the main controller 120 translates the technical causes of the fault into operational steps that ordinary users can understand and perform, giving the distribution box basic operational guidance functions.

[0070] In step S2:

[0071] The proportion of inductive component is determined based on the ratio of the cumulative reactive power in the lagging power region to the total apparent power.

[0072] The proportion of nonlinear components is determined by comparing the peak value of the rate of change of the current waveform in the peak impact zone with a preset benchmark value, and by weighting the result of the excess part and the ratio of the total active power.

[0073] The resistive component ratio is determined by the ratio of the remaining pure resistive power consumption to the total active power after subtracting the power consumed by the nonlinear component from the cumulative power in the in-phase power region.

[0074] The specific calculation logic of the main controller 120 for online estimation of load components is as follows: The main controller 120 determines the proportion of inductive components by integrating the power in the lag power region where voltage and current have opposite signs in the instantaneous power curve. This integration result is regarded as reactive power. Then, this reactive power is divided by the total apparent power calculated for the entire AC cycle. The resulting ratio is the proportion of inductive components, which reflects the amount of energy used by the load to establish the magnetic field. The main controller 120 determines the proportion of nonlinear components by calculating the rate of change of the current waveform with time in the peak impulse region near the voltage peak and comparing the peak value of this rate of change with the reference value representing the maximum rate of change of the standard sine waveform.

[0075] Here, the peak impact zone is objectively defined as the range within ±10% of the phase angle of the voltage waveform reaching its peak value within its period; the preset reference value is obtained by calibrating a purely resistive load, such as an incandescent lamp, under standard power grid conditions, collecting its current waveform during stable operation, and calculating the maximum rate of change of this waveform; for the portion exceeding the reference value, a non-restrictive implementation method for weighted calculation is:

[0076] The portion of the current change rate exceeding the benchmark value is linearly combined with the current peak value itself to comprehensively assess the intensity of the nonlinear impact; for example, the calculation logic could be:

[0077] First, calculate the contribution value of the nonlinear current: ;

[0078] in: Time weighting coefficient, unit: seconds; The peak weighting coefficient is dimensionless.

[0079] Further estimate the nonlinear contribution value: ;

[0080] in, Nominal voltage; This represents the peak value of the rate of change of current. This is a preset baseline value; This represents the peak current.

[0081] and These are preset weighting coefficients determined based on a large amount of experimental data, used to balance the effects of the rate of change and the peak value. and These two weighting coefficients were determined by fitting and calibrating the peak value of the current waveform change rate and the peak value of the current with the actual measured nonlinear losses in a large number of experimental tests involving various nonlinear devices such as switching power supplies and rectifier loads. They are designed to ensure the accuracy and robustness of the assessment of the degree of nonlinear impact.

[0082] The portion exceeding the reference value has its amplitude and current peak value weighted and calculated. The ratio of the result to the total active power is determined as the proportion of nonlinear components. This reflects the degree to which the current waveform deviates from the sinusoidal shape. The main controller 120 determines the proportion of resistive components. The derivation process is to first subtract the nonlinear power consumption calculated based on the nonlinear component proportion from the total power accumulated in the in-phase power region where voltage and current have the same sign. The remaining part is regarded as pure resistive power consumption used purely for heating or doing work. By comparing this pure resistive power consumption with the total active power, the proportion of resistive components can be obtained.

[0083] The power consumed by the nonlinear component is estimated and calculated by multiplying the calculated proportion of the nonlinear component by the total power accumulated in the in-phase power region.

[0084] The high-frequency electrical parameter sensor 110 is a combination of a Hall effect current sensor and a voltage divider resistor type voltage sensor, with one set configured independently on each output circuit.

[0085] The high-frequency electrical parameter sensor 110 functions to provide high-fidelity instantaneous voltage and current waveform data to the main controller 120. Various specific component configurations can be used to achieve this function. In this embodiment, a feasible and non-limiting implementation is to use a combination of sensors, consisting of a Hall effect current sensor (e.g., an ACS712 sensor) and a voltage divider resistor network. The Hall effect current sensor is non-contactly wrapped around a single loop conductor to accurately measure the current flowing through it. The voltage divider resistor network is connected in parallel between the live and neutral wires of the loop to safely reduce the high voltage to a range that the microprocessor can handle.

[0086] The high-frequency electrical parameter sensor 110, this sensor combination needs to have a sufficiently high sampling rate and bandwidth to accurately capture the rapid transient changes and distortions of current and voltage waveforms within the AC cycle, and ensure the accuracy of instantaneous power curve calculation;

[0087] To enable independent monitoring and protection of each circuit, each output circuit is equipped with an independent set of sensors.

[0088] The main controller 120 is connected to the multi-channel solid-state relay array 210 in the power execution compartment 200 via an opto-isolator.

[0089] The core function of the connection between the main controller 120 and the multi-channel solid-state relay array 210 is to reliably transmit switching commands while ensuring electrical isolation between the low-voltage circuit on the control side and the high-voltage circuit on the power side. This isolation is to prevent electrical noise or transient high voltage generated in the power execution compartment 200 due to switching large currents from interfering with the normal operation of the main controller 120 in the sensing and analysis compartment 100. To achieve this function, various isolation technologies can be used. In this embodiment, the two are connected through an opto-isolator. The low-voltage digital control signal emitted by the main controller 120 drives the light-emitting diode inside the opto-isolator, and the light emitted is received by the phototransistor on the other side and converted into an electrical signal, which then triggers the corresponding solid-state relay. Another feasible method is to use a pulse transformer for isolation.

[0090] Example 2:

[0091] Please see Figures 1-3 A multi-functional portable power distribution box, comprising:

[0092] The intelligent power distribution host includes a sealed metal shell that is divided into an upper sensing and analysis compartment 100 and a lower power execution compartment 200;

[0093] The main controller 120 is located inside the sensing and analysis cabin 100;

[0094] A high-frequency electrical parameter sensor 110 is installed inside the sensing and analysis chamber 100 and is electrically connected to the main controller 120.

[0095] A multi-channel solid-state relay array 210 is housed in the power execution compartment 200 and electrically connected to the main controller 120.

[0096] The human-machine interface panel 130 is located on the front shell of the intelligent power distribution host and is electrically connected to the main controller 120;

[0097] The output circuit interface 220 is located on the front casing of the intelligent power distribution host. Each output circuit interface 220 is connected in series with one solid-state relay in the multi-channel solid-state relay array 210.

[0098] This embodiment provides a multifunctional portable power distribution box. The core of this box is an intelligent power distribution host, whose sealed metal casing physically separates it into an upper sensing and analysis compartment 100 and a lower power execution compartment 200. This separation design aims to isolate heat and electromagnetic interference. The sensing and analysis compartment 100 houses a main controller 120 and a high-frequency electrical parameter sensor 110, responsible for data processing and decision-making. The power execution compartment 200 contains a multi-channel solid-state relay array 210, responsible for actual current switching.

[0099] Each solid-state relay in the multi-channel solid-state relay array 210 is selected as a product with sufficient current carrying capacity and high reliability shutdown capability, and its parameters should be able to adapt to the total rated power of the distribution box and the expected maximum inrush current.

[0100] The main controller 120 is electrically connected to the high-frequency electrical parameter sensor 110, the multi-channel solid-state relay array 210, and the human-machine interface panel 130. On the front casing of the intelligent power distribution host, there is a human-machine interface panel 130 for user operation and an output circuit interface 220 for connecting external devices. On the power supply line of each output circuit interface 220, a corresponding solid-state relay is connected in series and controlled by the main controller 120 according to the protection strategy.

[0101] The multi-channel solid-state relay array 210 is uniformly mounted on an aluminum substrate with heat dissipation fins, which serves as the rear wall of the power execution compartment 200.

[0102] The multi-channel solid-state relay array 210 generates heat due to its on-resistance during operation, requiring effective heat dissipation to ensure its reliability. In this embodiment, all solid-state relays in the array are uniformly mounted on a single aluminum substrate. One side of this substrate is machined with dense heat dissipation fins. Structurally, this substrate with the relays directly forms the rear wall of the power execution compartment 200, exposing the side with the heat dissipation fins directly to the outside air. This arrangement allows the heat generated by the solid-state relays to be quickly conducted to the external heat dissipation fins through the high thermal conductivity of the aluminum substrate and dissipated through air convection. This design utilizes the structural components themselves to achieve heat dissipation, resulting in a compact structure and high reliability.

[0103] The output circuit interface 220 consists of multiple national standard combination power sockets, each with a ring indicator light next to it. The ring indicator light corresponds one-to-one with the circuit information displayed on the human-machine interface panel 130.

[0104] To provide users with intuitive and unambiguous status feedback, the output loop interface 220 and its associated indicator structure have been specially designed. In this embodiment, the output loop interface 220 is specifically implemented as multiple combination power sockets conforming to national standards, fixed to the front of the device; next to each power socket, there is a ring indicator light; these indicator lights are directly controlled by the main controller 120, and their display status, such as color and flashing mode, is synchronized with the graphical information of the corresponding loop on the human-machine interface panel 130. For example, when the human-machine interface panel 130 displays that loop 4 has been disconnected due to a fault and is marked in red, the ring indicator light next to the power socket marked 4 on the physical device will also light up in red simultaneously; this dual indication method of hardware and software linkage ensures that users can quickly and accurately locate the specific faulty interface, facilitating subsequent processing.

[0105] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method of using a multifunctional portable power distribution box, characterized in that, include: S1. Set up an intelligent power distribution host, wherein the intelligent power distribution host includes a sealed metal shell that is divided into an upper sensing and analysis compartment (100) and a lower power execution compartment (200); a main controller (120) and a high-frequency electrical parameter sensor (110) are set in the sensing and analysis compartment (100), and a multi-channel solid-state relay array (210) is set in the power execution compartment (200). S2. The main controller (120) estimates the load components and constructs a load profile online. The AC cycle is locked by the voltage zero-crossing point collected by the high-frequency electrical parameter sensor (110), and the instantaneous power curve within the cycle is calculated. Based on the power contribution of the instantaneous power curve in the in-phase power region, the lagging power region, and the peak impact region, the proportion of resistive, inductive, and nonlinear components of the load is calculated in reverse. S3. The main controller (120) dynamically synthesizes a customized virtual tripping curve according to the proportion of the load components. The current threshold of the long-delay overload protection part of the virtual tripping curve is linearly adjusted upward based on the total proportion of resistive and inductive components above a base value. Its short-circuit instantaneous protection part is triggered according to the rate of change of current over time. In addition, the starting impact current magnitude and duration are relaxed in a stepwise manner according to the proportion of inductive components to adapt to the starting of motor-type loads. S4. When the protection strategy of any output circuit is triggered, the main controller (120) drives the corresponding solid-state relay in the multi-channel solid-state relay array (210) to cut off the circuit, and marks the icon of the fault circuit in red on the human-machine interface panel (130) in a graphical manner, and at the same time lights up the indicator light above the physical socket corresponding to the fault circuit in red.

2. The method of using a multifunctional portable power distribution box according to claim 1, characterized in that, This also includes the following when new load is connected: The main controller (120) executes the online profile construction process and estimates the stable operating power of the new load based on historical records or records after stable operation. The stable operating power is added to the total power of all currently connected loads. If the predicted total power exceeds the safety threshold, an early warning is issued through the human-machine interface panel (130), and the load with the highest current power is highlighted.

3. The method of using a multifunctional portable power distribution box according to claim 2, characterized in that, The step S4 is followed by: The main controller (120) displays user-friendly guided operation instructions on the human-machine interface panel (130) based on the reason for triggering the protection strategy.

4. The method of using a multifunctional portable power distribution box according to claim 3, characterized in that, In step S2: The proportion of inductive component is determined based on the ratio of the cumulative reactive power in the lag power region to the total apparent power. The proportion of nonlinear components is determined by comparing the peak value of the rate of change of the current waveform in the peak impact zone with a preset benchmark value, and by weighting the result of the excess part and the ratio of the total active power. The proportion of resistive component is determined based on the ratio of the remaining pure resistive power consumption to the total active power after subtracting the power consumed by the nonlinear component from the cumulative power in the in-phase power region. The calculation logic is as follows: First, calculate the contribution value of the nonlinear current: ; in: Time weighting coefficient, unit: seconds; The peak weighting coefficient is dimensionless. Further estimate the nonlinear contribution value: ; in, Nominal voltage; This represents the peak value of the rate of change of current. This is a preset baseline value; This represents the peak current.

5. The method of using a multifunctional portable distribution box according to claim 3, characterized in that, The high-frequency electrical parameter sensor (110) is a combination of a Hall effect current sensor and a voltage divider resistor voltage sensor, with one set configured independently on each output circuit.

6. The method of using a multifunctional portable distribution box according to claim 3, characterized in that, The main controller (120) is connected to the multi-channel solid-state relay array (210) in the power execution compartment (200) via an opto-isolator.

7. A multifunctional portable distribution box, applied to the method of using the multifunctional portable distribution box according to any one of claims 1 to 6, characterized in that, include: The intelligent power distribution host includes a sealed metal housing divided into an upper sensing and analysis compartment (100) and a lower power execution compartment (200); The main controller (120) is located inside the sensing and analysis cabin (100); A high-frequency electrical parameter sensor (110) is installed inside the sensing and analysis chamber (100) and electrically connected to the main controller (120). A multi-channel solid-state relay array (210) is disposed in the power execution compartment (200) and electrically connected to the main controller (120); The human-machine interface panel (130) is disposed on the front shell of the intelligent power distribution host and is electrically connected to the main controller (120). The output circuit interface (220) is located on the front casing of the intelligent power distribution host, and each output circuit interface (220) is connected in series with one solid-state relay of the multi-channel solid-state relay array (210).

8. A multifunctional portable power distribution box according to claim 7, characterized in that, The multi-channel solid-state relay array (210) is uniformly mounted on an aluminum substrate with heat dissipation fins, which serves as the rear wall of the power execution compartment (200).

9. A multifunctional portable power distribution box according to claim 7, characterized in that, The output circuit interface (220) consists of multiple national standard combination power sockets, each with a ring indicator light next to it. The ring indicator light corresponds one-to-one with the circuit information displayed on the human-machine interface panel (130).

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