Intelligent overload protection multi-functional power strip

Abstract

The utility model discloses a kind of intelligent overload protection multifunctional power strip, it is related to smart home field, solve the problem that current similar power strip product exists single function, overload protection is not perfect enough, poor compatibility of jack and insufficient safety problem.A kind of intelligent overload protection multifunctional power strip includes cuboid shell, L type conducting substrate, overload protection component, rotatable jack module and USB charging module piece;The utility model is by setting L type conducting substrate integrated power input terminal in shell interior, cooperate current sensing module in overload protection component, MCU control unit, bimetallic strip linkage mechanism and electromagnetic relay, realize accurate overload protection function, while jack module can rotate 360 degrees, integrate multiple standard jacks and Type-C charging interface, safety baffle is set below, USB charging module is detachable and convenient to replace, to realize jack diversification, safety protection upgrade, charging function expansion and modular maintenance.

Description

Technical Field

[0001] This utility model relates to the field of smart home, and more specifically to a smart overload protection multi-functional power strip. Background Technology

[0002] Smart overload protection multi-functional power strips have a wide range of applications, including home appliances, mobile devices, and home improvement. Through an internal current sensing module and MCU control unit, these power strips collect real-time current data from each socket branch and transmit the data to the user's mobile app via WiFi, allowing users to monitor power usage in real time. Users can also remotely control and time their appliances, and in the event of an overload or short circuit, the app will automatically cut off power and trigger an alarm.

[0003] In summary, intelligent overload protection multi-functional power strips have many advantages, such as overload protection, surge protection, multi-functionality, intelligent control, and high safety. However, they also have some disadvantages and drawbacks, including the following: 1. Overload risk: Existing intelligent overload protection multi-functional power strips pose an overload risk when the total power of electrical appliances approaches the rated power of the socket, which may lead to short circuit or fire. 2. Safety hazards: Some low-quality multi-functional sockets may pose safety hazards. 3. The operation is complex, and some complex functions may not be intuitive enough, making it unfriendly to some users; 4. Overheating issue: Incompatibility with different international standard plugs may result in a small contact area, which can easily cause overheating or even fire when using high-power appliances. In conclusion, the intelligent overload protection multi-functional power strip still needs improvement in key aspects of overload protection and safety. Continuous technology optimization is required to enhance the accuracy and reliability of overload protection, thereby improving user experience and product safety. Utility Model Content

[0004] The purpose of this utility model is to realize an intelligent overload protection multi-functional power strip that can effectively solve the problems of overload risk, safety hazards, complex operation, heat generation and poor durability of traditional power strips.

[0005] To achieve the above-mentioned technical effects, the present invention adopts the following technical solution: like Figure 1As shown, a smart overload protection multi-functional power strip includes: a cuboid housing, wherein the housing is formed by an upper shell and a lower shell fastened together by snap-fit ​​flanges distributed around the perimeter, forming a rectangular receiving cavity inside; an L-shaped conductive substrate is fixedly installed at the bottom of the receiving cavity, with a power input terminal integrated in the horizontal section and an overload protection component installed in the vertical section; a rectangular socket area is opened on the upper surface of the housing, and a rotatable socket module is embedded inside; a power inlet is built into the right side wall of the housing, and the power cord is welded to the power input terminal through the inlet; a heat dissipation grille is provided on the left side wall; and a push-pull expansion compartment (109) is provided on the front side of the housing, which houses a detachable USB charging module.

[0006] As a further description of the above technical solution: A surge protector varistor is installed between the power input terminal and the horizontal section of the conductive substrate. The two ends of the varistor are soldered to the live wire and neutral wire of the power input terminal, respectively, and the grounding terminal is connected to the metal shielding layer of the casing via a wire. A surge absorption inductor is installed in the middle of the vertical section of the conductive substrate. As a further description of the above technical solution: The overload protection component includes a current-sensing spring sheet, a current-sensing module, an MCU control unit, a bimetallic strip linkage mechanism, and an electromagnetic relay. The current-sensing module collects the total current signal of the conductive substrate in real time and transmits it to the MCU control unit. The MCU drives the electromagnetic relay to cut off the circuit, and at the same time, it links the bimetallic strip linkage mechanism to physically separate the contacts.

[0007] As a further description of the above technical solution: The current-sensing spring sheet is made of phosphor bronze with a thickness of 0.3-0.5mm. Its length is parallel to the vertical section of the conductive substrate, and its end is provided with an arc-shaped protrusion to form elastic contact with the contact point of the bimetallic linkage mechanism. The bimetallic linkage mechanism includes an upper copper sheet and a lower iron sheet, which are fixedly connected by rivets. Its end is provided with a movable contact that can move up and down, corresponding to the stationary contact on the conductive substrate.

[0008] As a further description of the above technical solution: The socket module includes a rectangular base plate that rotates 360 degrees, with standard Chinese three-hole, American standard two-hole, British standard square hole and Type-C charging interface evenly distributed around its circumference. Each interface is connected to a safety shield below it via a reset spring. The socket module has an elastic conductive post at the bottom, with its bottom end sliding in contact with the annular conductive track of the conductive base plate and its top end connected to the independent power supply line of each interface. The Type-C charging interface integrates a step-down module below it to convert AC power into 5-20V DC output.

[0009] As a further description of the above technical solution: The rotatable socket module has an annular guide rail at the bottom of its rectangular base plate, which cooperates with the annular groove on the upper surface of the housing to achieve 360° rotation positioning. The elastic conductive pillars are set in three groups, using three groups of 120° evenly distributed compression spring support structures. Together with the annular conductive rail of the conductive base plate, they maintain a contact pressure of 3N during the rotation of the socket module, with a conductive contact resistance of 50m. Each group includes a conductive pillar body and a compression spring. The lower end of the compression spring is fixed to the top of the conductive base plate, and the upper end supports the conductive pillar body to contact the bottom surface of the rectangular base plate.

[0010] As a further description of the above technical solution: The horizontal section of the L-shaped metal sheet of the safety shield is 0.2mm thick. A 5-8N closing force is provided by a return spring. It is pushed open only when the plug insertion force is 10N, effectively preventing children's fingers or foreign objects from being inserted, and meets the IP44 solid intrusion protection standard.

[0011] As a further description of the above technical solution: The USB charging module is connected to the conductive substrate slot via a spring-loaded pin connection on the side gold fingers. Combined with the dovetail-shaped guide rail at the bottom of the expansion compartment, it achieves blind insertion with a precision of 0.5mm, supporting tool-free module replacement within 3 seconds. The guide rail surface is coated with polytetrafluoroethylene, with a push-pull resistance of 15N, improving user operation convenience.

[0012] The positive and beneficial technical effects of this utility model are as follows: This invention uses a current sensing module to collect the total current signal of the conductive substrate in real time and transmit it to the MCU control unit. The MCU drives the electromagnetic relay to cut off the circuit, and at the same time, the bimetallic strip is linked to physically separate the contacts, effectively avoiding the risk of short circuit or fire caused by excessive current and improving electrical safety. This invention uses a current sensing spring made of phosphor bronze, which has good elasticity and conductivity. While ensuring stable circuit connection, it can accurately sense current changes and provide a reliable basis for overload protection. The socket module of this utility model can rotate 360 ​​degrees and integrates multiple standard sockets and a Type-C charging interface to meet the plug usage needs of different regions and different electrical appliances, thus improving the universality and applicability of the power strip. This utility model features a safety shield at the bottom of the socket module, which only opens when the plug insertion force reaches 10N, effectively preventing children's fingers or foreign objects from being inserted, meeting the IP44 solid object intrusion protection standard and enhancing product safety. The USB charging module of this utility model achieves blind insertion with a precision of 0.5mm through a spring-pin connection between the side gold fingers and the conductive substrate slot, combined with a dovetail-shaped guide rail at the bottom of the expansion compartment. It supports tool-free module replacement within 3 seconds, improving user convenience. This utility model uses a temperature sensor to monitor the internal temperature in real time, automatically cutting off the power when the temperature is too high, further reducing safety hazards caused by high temperatures. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein: Figure 1 This is a structural diagram of a smart overload protection multifunctional power strip according to this utility model; Figure 2 This is a structural diagram of a conductive substrate for a smart overload protection multifunctional power strip according to this utility model; Figure 3 This is a structural diagram of a smart overload protection multifunctional power strip overload protection component according to the present invention; Figure 4 This is a structural diagram of a smart overload protection multifunctional power strip socket module according to this utility model; In the diagram: Rectangular housing - 100, Upper shell - 101, Lower shell - 102, Snap-fit ​​flange - 103, Rectangular receiving cavity - 104, Rectangular socket area - 105, Power inlet - 106, Power cord - 107, Heat dissipation grille - 108, Expansion compartment - 109, L-shaped conductive substrate - 200, Power input terminal - 201, Conductive substrate slot - 203, Lightning protection varistor - 204, Wire - 205, Surge absorption inductor - 206, Overload protection component - 300, Current sensor The components include: spring sheet-301, bimetallic strip linkage mechanism-302, contact-304, current sensing module-305, MCU control unit-306, MCU drive electromagnetic relay-307, socket module-400, rectangular substrate-402, Chinese standard three-hole socket-403, American standard two-hole socket-404, British standard square socket-405, Type-C charging interface-406, reset spring-407, safety shield-408, step-down module-409, and USB charging module-500. Detailed Implementation

[0014] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0015] A smart overload protection multi-functional power strip includes: a cuboid housing 100, wherein the housing 100 is formed by an upper shell 101 and a lower shell 102 fastened together by snap-fit ​​flanges 103 distributed around the perimeter, forming a rectangular receiving cavity 104 inside; an L-shaped conductive substrate 200 is fixedly installed at the bottom of the receiving cavity 104, a power input terminal 201 is integrated in the horizontal section, and an overload protection component 300 is installed in the vertical section; a rectangular socket area 105 is opened on the upper surface of the housing 100, and a rotatable socket module 400 is embedded inside; a power inlet 106 is built into the right side wall of the housing 100, and a power cord 107 is welded to the power input terminal 201 through the inlet 106; a heat dissipation grille 108 is provided on the left side wall; a push-pull expansion compartment 109 is provided on the front side of the housing 100, and a detachable USB charging module 500 is embedded inside.

[0016] Furthermore, a surge protector varistor 204 is provided between the power input terminal 201 and the horizontal section of the conductive substrate 200. The two ends of the varistor 204 are respectively soldered to the live wire end and the neutral wire end of the power input terminal 201, and the grounding end is connected to the metal shielding layer of the housing 100 through the wire 205. A surge absorption inductor 206 is provided in the middle of the vertical section of the conductive substrate 200.

[0017] In a specific embodiment, one end of the power cord 107 is connected to a household electrical socket, and the other end enters the socket housing 100 through the power inlet 106 and is soldered to the power input terminal 201 to connect to the household circuit. Current flows in from the live wire and out from the neutral wire, forming a closed loop. A surge protector varistor 204 is soldered between the live wire and the neutral wire of the power input terminal 201. Under normal conditions, it has a high impedance >10MΩ and does not affect the circuit power supply. However, when encountering a ground lightning strike or spatial electromagnetic induction that causes a momentary increase in input voltage (such as exceeding 1.5 times the rated voltage), the impedance can drop sharply to <10Ω within <1ns, providing a low-impedance discharge path for the lightning current and guiding the current to the ground wire 205. It has been measured to withstand a lightning current impact of 20kA under an 8 / 20s waveform, protecting the socket and connected appliances. The surge absorption inductor 206 installed in the middle of the vertical section of the conductive substrate 200 generates a reverse electromotive force due to the change in current when the household circuit generates surge current due to the start-stop of appliances and the start of motors. Tests have shown that it can suppress the rise rate of surge current to below 50A / s, reducing the peak surge current by more than 60% compared to when it is not installed, effectively reducing the impact of surge on the circuit. Compared with other technical solutions, this technical solution has significant advantages: First, it offers superior lightning protection performance. Traditional solutions often use a single varistor or gas discharge tube, with varistor response times typically ranging from 5 to 10 ns and surge current withstand capabilities generally below 10 kA. In contrast, this solution improves varistor response speed by 5 to 10 times and doubles surge withstand capability, enabling it to handle more severe lightning overvoltages. Second, it provides more comprehensive surge suppression. Some solutions lack surge absorption inductors or rely solely on simple capacitor filtering, offering limited suppression of high-frequency surges >100 kHz. This solution dynamically suppresses current changes through inductors, covering a wide frequency range of 10 kHz to 10 MHz surges, improving suppression efficiency by over 40%. Third, it features a more rational structural design. The surge absorption inductor is installed in the middle of the vertical section of the conductive substrate, forming a three-dimensional protection layout. Compared to traditional planar layouts, this reduces the circuit board area by 30%. Furthermore, the inductor and varistor work together to achieve graded discharge and dynamic buffering of lightning surges, improving protection reliability by 50%.

[0018] Furthermore, the overload protection component 300 includes a current sensing spring sheet 301, a current sensing module 305, an MCU control unit 306, a bimetallic strip linkage mechanism 302, and an electromagnetic relay 307; the current sensing module 305 collects the total current signal of the conductive substrate 200 in real time and transmits it to the MCU control unit 306, the MCU drives the electromagnetic relay 307 to cut off the circuit, and at the same time, it links the bimetallic strip linkage mechanism 302 to physically separate the contacts 304.

[0019] In a specific embodiment, a current-sensing spring 301 located at an appropriate position on the conductive substrate 200 is connected to a current-sensing module 305 installed near the power input terminal 201 to monitor the total current in real time. When household appliances are working normally, the current signal collected by the current-sensing module 305 is within the normal range of the rated current of 16A. The MCU control unit 306 will not trigger the overload protection action, and the current flows normally through the conductive substrate 200 to each socket and the USB charging module 500. If multiple high-power appliances are used simultaneously in the household, causing the total current of the power strip to exceed the rated overload action threshold of 16A by 5%, the current-sensing module 305 can detect the current abnormality within 20 seconds and transmit the signal to the MCU control unit 306. The MCU control unit 306 drives the electromagnetic relay 307 to cut off the circuit within 30 seconds according to the preset program, and at the same time sends a signal to the bimetallic strip linkage mechanism 302, which operates within 80ms and physically separates the contacts 304. The double circuit cut-off prevents the overload current from continuing to flow. Actual testing showed that this overload protection mechanism can control the circuit cut-off time to 100ms, improving the response speed by more than 40% compared to a single protection scheme. Compared with other technical solutions, this technical solution has significant advantages: First, it adopts a dual physical cut-off structure of electromagnetic relay and bimetallic strip linkage mechanism, which is different from the single-point protection mode of single electromagnetic relay or bimetallic strip in traditional solutions. When the electromagnetic relay is not completely disconnected due to arc adhesion, the bimetallic strip linkage mechanism can ensure that the contact 304 is forcibly separated, improving the protection reliability under fault conditions by 70%. Second, the current sensing module 305 is directly installed on the conductive substrate 200 close to the power input terminal 201. Compared with the traditional design where the sensing element is 5cm away from the input terminal, it can detect abnormal current changes 30s in advance, avoiding detection delay caused by line impedance. Third, the MCU control unit 306 integrates intelligent algorithms, which can identify surge current and real overload (the surge current tolerance time is set to 200ms), avoiding false triggering. The measured false trigger rate is as low as 0.3 times / 10,000 hours, which is far lower than the 5% of traditional mechanical overload protection devices. The false alarm rate per 10,000 hours; fourth, the dual cut-off mechanism adopts an independent drive circuit, with the electromagnetic relay responsible for rapid power-off response at the 50ms level, and the bimetallic strip achieving mechanical locking to avoid surge power restoration after power failure, forming a redundant design of electronic detection and mechanical protection, which reduces the failure risk by 65% ​​compared to a single protection scheme.

[0020] Furthermore, the current-sensing spring sheet 301 is made of phosphor bronze with a thickness of 0.3-0.5 mm. Its length direction is parallel to the vertical section of the conductive substrate 200, and its end is provided with an arc-shaped protrusion 3011 to form elastic contact with the contact 304 of the bimetallic strip linkage mechanism 302. The bimetallic strip linkage mechanism 302 includes an upper copper sheet 3021 and a lower iron sheet 3022, which are fixedly connected by rivets 3023. Its end is provided with a movable contact 304 that can move up and down, corresponding to the stationary contact 202 on the conductive substrate 200.

[0021] In a specific embodiment, the current-sensing spring sheet 301 is mounted on the side of the vertical segment of the conductive substrate 200, with its length direction parallel to the vertical segment. One end is fixed, and the arc-shaped protrusion 3011 at the other end elastically contacts the contact 304 of the bimetallic strip linkage mechanism 302. The upper copper sheet 3021 of the bimetallic strip linkage mechanism 302 has a coefficient of thermal expansion. The coefficient of thermal expansion of the lower iron sheet 3022 The moving contact 304 is fixedly connected by rivets 3023 and is located directly above the stationary contact 202 on the conductive substrate 200. When the household appliance is working normally, the rated current is 16A. The current sensing spring 301 is deformed by the magnetic force of the current, with a deformation of 0.3mm, but not exceeding the elastic limit. The elastic deformation threshold is 0.5mm. The bimetallic linkage mechanism 302 remains stationary, and the moving contact 304 continues to contact the stationary contact 202 to ensure circuit continuity. When the overload current exceeds 16A5%, the magnetic force on the current-sensing spring 301 increases with the increase of current. After the deformation exceeds the elastic limit of 0.5mm, it pushes the bimetallic linkage mechanism 302. At the same time, the current heating effect causes the temperature of the bimetallic strip to rise at a rate of 5℃ / s. Due to the difference in thermal expansion coefficients of copper and iron, a downward bending moment is generated with a bending radius change rate of 0.2mm / A. This causes the moving contact 304 to separate from the stationary contact 202 at a speed of 2m / s. The total response time from the generation of the overload current to the circuit cutoff is measured to be 60ms. Compared with other technical solutions, this technical solution has significant advantages: First, it innovatively adopts a composite driving mechanism of magnetostrictive deformation triggering and bimetallic thermal effect, which is different from the traditional single bimetallic strip relying on current heating for single triggering, with a response time of 150ms or pure electromagnetic induction schemes that are prone to false triggering due to high-frequency interference. The response speed is improved by 60% and the anti-interference capability is enhanced by 3 times. Second, the copper-iron composite material combination of the bimetallic strip controls the action threshold accuracy to 3%, compared to 8% for the traditional aluminum-steel composite scheme. Furthermore, through the elastic contact design of the 3011 arc-shaped protrusion of the spring sheet, the contact resistance of the contact point is stably controlled at 50mΩ, which is 40% lower than the traditional rigid contact, reducing contact heat loss. Third, the three-dimensional structural layout with the spring sheet vertically installed on the side of the conductive substrate reduces the space occupied by the overload protection component by 40% compared to the traditional planar layout. At the same time, by utilizing the synergistic effect of the magnetostrictive push of the spring sheet and the thermal bending of the bimetallic strip, it achieves dual protection of rapid mechanical separation within 20ms and thermally stable continuous disconnection. After 20,000 life tests, there was no adhesion failure, and the reliability is 2.5 times higher than the single thermal tripping scheme.

[0022] Furthermore, the socket module 400 includes a rectangular substrate 402 that can rotate 360 ​​degrees, with a circumferentially distributed Chinese standard three-hole 403, American standard two-hole 404, British standard square hole 405 and Type-C charging interface 406. Each interface is connected to a safety shield 408 below it via a reset spring 407. The socket module 400 is provided with an elastic conductive post 401 at the bottom, with its bottom end sliding contacting the annular conductive track of the conductive substrate 200 and its top end connected to the independent power supply line of each interface. The Type-C charging interface 406 is integrated with a step-down module 409 below it, which converts AC power into 5-20V DC output.

[0023] In a specific embodiment, after the power strip is connected to the household circuit, the bottom end of the elastic conductive post 401 of the socket module 400 slides into contact with the annular conductive track of the conductive substrate 200 with a contact pressure of 0.2N to 0.05N, and the contact resistance is 30mΩ, ensuring reliable electrical connection; the rectangular substrate 402 supports 360° seamless rotation, and the rotation torque is... It is compatible with various plug standards including Chinese, American, and British standards. When a user inserts a Chinese standard three-prong plug, the plug pushes open the safety shield 408 with a force of 5-10N. The return spring 407 is compressed to 2mm, and the metal contact piece forms an effective contact area of ​​8mm² with the plug's conductive pin. The current flows through the elastic conductive post 401, with a conductive cross-sectional area of ​​10mm², and the conductive substrate 200 to the power input terminal 201. At the same time, the step-down module 409 below the Type-C charging interface 406 adopts synchronous rectification technology, with an AC-DC conversion efficiency of 92%. It can stably convert 220V AC power into multiple DC power levels of 5V / 3A, 9V / 2A, and 12V / 1.5A within 50ms, with a voltage fluctuation of 0.5%. When the power of household appliances is too high, causing the current to exceed the rated value of 16A, the overload protection component on the conductive substrate 200 is triggered within 60ms, driving the elastic conductive post 401 to physically separate from the annular conductive track by a separation distance of 1.5mm, cutting off the power supply circuit of the socket. Compared with other technical solutions, this technical solution has significant advantages: First, the rotatable socket design breaks through the fixed angle limitation of traditional power strips. The 360-degree rotating structure of the rectangular base plate increases the freedom of plug insertion by 100% and improves space utilization by 40%. It can accommodate 3 sets of different standard sockets in the same volume and has been tested to be compatible with more than 15 international plug specifications. Second, the safety protection mechanism is more complete, and the safety shield needs to be 5N. The charging module requires a thrust to open, exceeding the national standard requirement of 3N. Combined with a 0.3s rapid reset function using a return spring, it prevents accidental electric shock risks to children, improving safety by 70% compared to unshielded solutions. Thirdly, the charging module boasts superior compatibility and efficiency. The step-down module supports a wide output range of 5-20V, covering over 95% of portable electronic devices. Its conversion efficiency is 30% higher than traditional linear step-down solutions, with a full-load temperature rise of 35℃, lower than the industry average of 45℃. Fourthly, the overload linkage protection is more reliable. The separate design of the elastic conductive post and the ring-shaped conductive track increases the power supply cut-off speed of the socket by 50% compared to traditional integrated conductive structures during overload. The separation distance meets the safety electrical clearance standard GB / T 2099.1, avoiding the risk of arcing and adhesion. It has undergone 100,000 insertion and removal tests without any contact failures.

[0024] Furthermore, an annular guide rail is provided below the rectangular base plate 402 of the rotatable socket module 400, which cooperates with the annular groove opened on the upper surface of the housing 100 to achieve 360-degree rotation positioning; the elastic conductive pillars 401 are set in three groups, using three groups of 120 evenly distributed compression spring support structures, which cooperate with the annular conductive rail of the conductive base plate 200 to maintain a contact pressure of 3N during the rotation of the socket module 400, with a conductive contact resistance of 50m. Each group includes a conductive pillar body and a compression spring. The lower end of the compression spring is fixed to the top of the conductive base plate 200, and the upper end supports the conductive pillar body to contact the bottom surface of the rectangular base plate 402.

[0025] In a specific embodiment, the power strip is placed on a household table or floor. The annular groove on the upper surface of the housing 100 is 3mm deep and 5mm wide, corresponding to the annular guide rail 3mm high and 5mm wide below the rectangular substrate 402 of the rotatable socket module 400. After pressing, the guide rail snaps into the groove to form a 360° rotation structure with a rotation torque of 0.8N·m and a positioning accuracy of 1. When the user rotates the socket module 400, the 2mm toothed design of the annular guide rail and the groove 1051 enables smooth sliding and accurate positioning. The operation time to rotate the national standard three-hole 403 to the top is 1.5s. The elastic conductive post 401 adopts a three-group 120 evenly distributed design. Each group includes a conductive post body and a compression spring. The lower end of the compression spring is fixed to the top of the conductive substrate 200, and the upper end supports the conductive post body to contact the bottom surface of the rectangular substrate 402 with a continuous elastic force of 3N, ensuring a sliding contact resistance of 50m and a contact pressure deviation of 5% during rotation with the annular conductive track. When the national standard three-prong plug is inserted, the plug and the metal contact piece of the socket form a 10mm contact area. The current flows through the conductive post with a cross-sectional area of ​​8mm and the substrate to the power input terminal 201. The American standard two-prong 404 and the British standard square-hole 405 can be switched to the usage position by rotation. The step-down module 409 below the Type-C interface 406 supports 5-20V DC output, with a conversion efficiency of 93% and a ripple voltage of 50mV, meeting the charging needs of multiple devices. Compared with other technical solutions, this technical solution has significant advantages: First, the three-dimensional rotating connection structure breaks through the traditional fixed socket layout of power strips. The annular groove-guide rail combination allows the socket module to rotate more than 50,000 times, while the traditional snap-fit ​​structure has a lifespan of 20,000 times. Furthermore, the 360° adjustment without dead angles increases the utilization rate of plug insertion space by 60%, making it suitable for connecting multiple devices in confined spaces. Second, the elastic conductive column array design improves reliability by 3 times compared to the traditional single-column contact solution. The three sets of 120° evenly distributed structures can offset the contact stress during rotation. Mechanical testing shows a contact pressure fluctuation of 10%. With the dynamic compensation of the compression spring, the contact resistance fluctuation is <15% within the temperature range of -10℃ to 50℃. Traditional fixed contact resistance fluctuation >40%; thirdly, it has leading modular integration capability for multiple standard sockets. A single socket module can accommodate more than 3 international standard plugs, including Chinese standard, American standard and British standard. It reduces the volume by 40% compared with traditional multi-row fixed socket power strips. Moreover, the positioning tooth pattern design makes the blind insertion accuracy reach 98%, while the accuracy of traditional non-positioning structure is <70%; fourthly, the thermal stability of the conductive system is optimized. The contact area between the elastic conductive post and the ring track is 3 times larger than that of traditional point contact. Combined with the low impedance design of the ring conductive track of the substrate with a conduction impedance of 20m, the temperature rise of the contact part is 25℃ when fully loaded at 2500W, which is lower than the national standard requirement of 30℃, effectively reducing heat loss and safety hazards.

[0026] Furthermore, the horizontal section of the L-shaped metal sheet of the safety shield 408 is 0.2mm thick, and a closing force of 5-8N is provided by the return spring 407. It is pushed open only when the plug insertion force is 10N, effectively preventing children's fingers or foreign objects from being inserted, and meets the IP44 solid intrusion protection standard.

[0027] In a specific embodiment, the power strip is placed on a household table or floor. The socket module 400 is installed on the housing 100. The safety shield 408 below each socket is an L-shaped metal sheet with a horizontal section thickness of 0.2mm. A 5-8N closing force is provided by a return spring 407, which normally shields the socket to prevent foreign objects from entering. When a standard three-prong plug is inserted, the user applies a 10N insertion force. The plug pushes the safety shield 408 to overcome the spring force, causing the horizontal section to flip upwards. The plug then contacts the metal contact piece inside the socket to establish a circuit connection. Actual testing shows that the plug can be fully inserted when the shield flips to a 45° angle, and the effective conductive area of ​​the contact piece is 15mm². When the plug is removed, the safety shield 408 quickly returns to the closed state with a 0.2s response time under the action of the return spring. Fatigue testing of the return spring shows that the spring force decays by less than 10% after 50,000 cycles. Compared with other technical solutions, this technical solution has significant advantages: firstly, it offers superior safety protection performance, as the 10N insertion force requirement is higher than the 3N specified in the national standard. GB / T2099.1-2021 effectively prevents accidental contact by children, requiring a force exceeding that of a typical child's grip strength, reducing the risk of accidental contact by 60% compared to the traditional 5N insertion force solution. Secondly, the structural design is more durable, with a 0.2mm thick L-shaped metal sheet that is 30% stronger than the traditional 0.15mm sheet, combined with a constant closing spring force of 5-8N. It has passed a 100-hour salt spray test without rust or deformation, and has a service life of over 8 years, compared to approximately 5 years for traditional solutions. Thirdly, the reset mechanism is more reliable, with a 0.2s rapid reset speed that is 60% faster than the 0.5s reset time of the traditional spring sheet solution. It also adopts a dual-spring symmetrical design, which can maintain a minimum closing spring force of 5N even if a single spring fails, reducing the probability of foreign object entry by 40% compared to the single-spring solution. Fourthly, the electrical connection is more stable. After the shield is flipped, the contact pressure between the metal contact piece and the conductive pin of the plug reaches 12N2N, with a contact resistance of 20mΩ, which is 60% lower than the 50mΩ contact resistance of the traditional shield solution, reducing contact heat loss.

[0028] Furthermore, the USB charging module 500 is connected to the conductive substrate slot 203 via a spring-loaded pin connection through side gold fingers. In conjunction with the dovetail-shaped guide rail at the bottom of the expansion compartment 109, it achieves blind insertion with a precision of 0.5mm, supporting tool-free module replacement within 3 seconds. The surface of the guide rail is coated with polytetrafluoroethylene, and the push-pull resistance is 15N, improving user operation convenience.

[0029] In a specific embodiment, using the USB charging function, the gold fingers 501 on the side of the USB charging module 500 are aligned with the conductive substrate slot 203, achieving precise docking through a spring-loaded pin connection. Simultaneously, the bottom slide rail of the module engages with the dovetail-shaped guide slide rail at the bottom of the expansion compartment 109, completing blind insertion with a docking accuracy of 0.5mm. The PTFE coating on the slide rail surface reduces the push-pull resistance to 15N, allowing users to complete module installation within 3 seconds without tools. Inserting the phone's USB charging cable into the module interface allows current to flow through the conductive substrate 200 to power the module, initiating charging. If the USB charging module 500 malfunctions or requires an upgrade, the user can easily pull it out of the expansion compartment 109 and insert a new module for quick replacement; this process does not affect other functions of the power strip. Actual testing shows that the contact resistance of the spring-loaded pin connection is 10mΩ, it can withstand over 5000 insertion / removal cycles, and the module installation detection sensor response time is 50ms. Compared with other technical solutions, this technical solution has significant advantages: Firstly, its modular design enables plug-and-play functionality. Traditional solutions often use welding or screw installation, which takes 2 minutes. This solution reduces installation time by 95%, and its 0.5mm high-precision guide rail ensures a 100% success rate for blind insertion, compared to 80% for traditional snap-fit ​​structures. First, it offers significant improvements. Second, it boasts enhanced connection reliability. The spring-loaded pin connection provides four times the vibration resistance of traditional ribbon cable connectors, with no contact defects observed after a 10G vibration test and a 70% reduction in contact resistance. Combined with the gold-plating process of the conductive substrate slot, the 5µm thick plating ensures no degradation in contact performance even after three years of use in a 90% humidity environment. Third, it significantly reduces maintenance costs. Traditional integrated charging modules require the entire power strip to be replaced in case of failure. The cost of replacing a single module in this solution is only 1 / 5 of the overall solution, and the replacement process does not affect the normal use of other sockets, reducing equipment downtime by 80%. Fourth, it offers superior expansion compatibility. The modular interface supports interchangeable modules for multiple fast charging protocols, including PD3.0 and QC4.0. Users can upgrade to a 100W GaN fast charging module or a dedicated Type-C module as needed, providing more than three times the functional expandability of traditional fixed charging modules.

[0030] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these specific embodiments are merely illustrative. Those skilled in the art can omit, substitute, and modify the details of the above methods and systems in various ways without departing from the principles and essence of this utility model. For example, combining the above method steps to perform substantially the same function and achieve substantially the same result according to substantially the same method falls within the scope of this utility model. Therefore, the scope of this utility model is defined only by the appended claims.

Claims

1. A smart overload protection multi-functional power strip, characterized in that, include: A rectangular housing (100) is formed by fastening an upper shell (101) and a lower shell (102) together with snap-fit ​​flanges (103) distributed around the perimeter, forming a rectangular receiving cavity (104) inside. An L-shaped conductive substrate (200) is fixedly installed at the bottom of the receiving cavity (104), with a power input terminal (201) integrated in the horizontal section and an overload protection component (300) installed in the vertical section. A rectangular socket area (105) is opened on the upper surface of the housing (100), and a rotatable socket module (400) is embedded inside. A power inlet (106) is built into the right side wall of the housing (100), and a power cord (107) is welded to the power input terminal (201) through the inlet (106). A heat dissipation grille (108) is provided on the left side wall. A push-pull expansion compartment (109) is provided on the front side of the housing (100), and a detachable USB charging module (500) is embedded inside.

2. The intelligent overload protection multifunctional power strip according to claim 1, characterized in that: A surge protection varistor (204) is provided between the power input terminal (201) and the horizontal section of the conductive substrate (200). The two ends of the varistor (204) are respectively soldered to the live wire end and the neutral wire end of the power input terminal (201), and the ground end is connected to the metal shielding layer of the housing (100) through the wire (205). A surge absorption inductor (206) is provided in the middle of the vertical section of the conductive substrate (200).

3. The intelligent overload protection multi-functional power strip according to claim 1, characterized in that: The overload protection component (300) includes a current sensing spring sheet (301), a current sensing module (305), an MCU control unit (306), a bimetallic strip linkage mechanism (302), and an electromagnetic relay (307). The current sensing module (305) collects the total current signal of the conductive substrate (200) in real time and transmits it to the MCU control unit (306). The MCU drives the electromagnetic relay (307) to cut off the circuit, and at the same time, it links the bimetallic strip linkage mechanism (302) to physically separate the contacts (304).

4. The intelligent overload protection multi-functional power strip according to claim 3, characterized in that: The current sensing spring sheet (301) is made of phosphor bronze with a thickness of 0.3-0.5 mm. Its length direction is parallel to the vertical section of the conductive substrate (200). An arc-shaped protrusion (3011) is provided at the end to form an elastic contact with the contact point (304) of the bimetallic linkage mechanism (302). The bimetallic linkage mechanism (302) includes an upper copper sheet (3021) and a lower iron sheet (3022), which are fixedly connected by rivets (3023). A movable contact point (304) that can move up and down is provided at the end, corresponding to the stationary contact point (202) on the conductive substrate (200).

5. The intelligent overload protection multi-functional power strip according to claim 1, characterized in that: The socket module (400) includes a rectangular base plate (402) that rotates 360 degrees, with a circumferentially distributed Chinese standard three-hole (403), American standard two-hole (404), British standard square hole (405) and Type-C charging interface (406). Each interface is connected to a safety shield (408) below it via a reset spring (407). The socket module (400) is provided with an elastic conductive post (401) at the bottom, with its bottom end sliding contacting the annular conductive track of the conductive base plate (200) and its top end connected to the independent power supply line of each interface. The Type-C charging interface (406) is integrated with a step-down module (409) below it, which converts AC power into 5-20V DC output.

6. The intelligent overload protection multi-functional power strip according to claim 5, characterized in that: The rotatable socket module (400) has an annular guide rail below the rectangular base plate (402) that cooperates with the annular groove on the upper surface of the housing (100) to achieve 360-degree rotation positioning. The elastic conductive pillar (401) is set in three groups, using three groups of 120 evenly distributed compression spring support structures, which cooperate with the annular conductive track of the conductive base plate (200) to maintain a contact pressure of 3N during the rotation of the socket module (400) and a conductive contact resistance of 50m. Each group includes a conductive pillar body and a compression spring. The lower end of the compression spring is fixed to the top of the conductive base plate (200), and the upper end supports the conductive pillar body to contact the bottom surface of the rectangular base plate (402).

7. The intelligent overload protection multifunctional power strip according to claim 5, characterized in that: The horizontal section of the L-shaped metal sheet of the safety shield (408) is 0.2mm thick. It provides a closing force of 5-8N through the return spring (407), and is pushed open only when the plug insertion force is 10N, effectively preventing children's fingers or foreign objects from being inserted, and meets the IP44 solid intrusion protection standard.

8. The intelligent overload protection multi-functional power strip according to claim 1, characterized in that: The USB charging module (500) is connected to the conductive substrate slot (203) via a spring pin on the side gold fingers. It is combined with the dovetail guide rail at the bottom of the expansion compartment (109) to achieve blind insertion with a precision of 0.5mm, supporting tool-free module replacement within 3 seconds. The surface of the guide rail is coated with polytetrafluoroethylene, and the push-pull resistance is 15N, improving the user's ease of operation.

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