An LED lamp power supply line

Abstract

The application discloses an LED lamp power line, which comprises a first connecting terminal, a second connecting terminal and two wires, the first connecting terminal comprises a first shell, a sliding seat, two first conductive seats, two fixed plates, two insulating heat-conducting pads, two memory alloy plates and two elastic sheets, the first conductive seat is connected with an insertion seat; the second connecting terminal comprises a second shell, a fixed seat and two second conductive seats, the second conductive seat is connected with an insertion frame, the insertion frame is provided with an insertion groove which can be inserted by the insertion seat; the elastic sheet presses the memory alloy plate so that the memory alloy plate abuts against the insulating heat-conducting pad and the insulating heat-conducting pad abuts against the insertion frame. The LED lamp power line can realize power-off when the terminal is heated.

Description

Technical Field

[0001] This invention relates to the field of electrical wires, and more specifically to a power cord for LED lighting fixtures. Background Technology

[0002] LED lighting technology, with its advantages of high efficiency, energy saving, and long lifespan, has been widely used in various indoor and outdoor lighting scenarios. However, the performance and lifespan of LED lamps are closely related to their operating temperature, and thermal management remains one of the core technical issues in LED lamp design. The power cord of an LED lamp is a key component of its internal circuitry. A typical LED lamp power cord includes conductors and terminals at both ends. When an LED lamp is working, part of the input power is converted into light energy, and the remainder into heat energy. This heat not only affects the LED chip itself but is also conducted to the power cord and terminals inside the lamp. The heating of the terminals mainly stems from the following aspects: First, contact resistance heating. There is contact resistance at the interface between the terminal pins and the spring contacts, which generates Joule heat when current flows through. If the connection becomes oxidized, loose, or improperly plugged in due to long-term use, the contact resistance increases significantly, and the heat generation increases dramatically. Second, the cumulative effect of ambient temperature rise. LED lamps typically use metal shells and aluminum substrates to enhance heat dissipation, but if the heat dissipation design is inadequate or the ambient temperature is too high, the heat generated by the driver power supply and LED devices will be superimposed, causing the overall temperature inside the lamp to rise, and the terminals will be in a continuously high-temperature environment. Third, current overload. In the event of a transient overcurrent event or a load short-circuit fault, the current flowing through the terminals far exceeds the rated value, causing the terminals to heat up rapidly.

[0003] To prevent LED lighting fixtures from overheating and being damaged, several common solutions exist in existing technologies. One common solution is to integrate a temperature detection and control module into the driver circuit. This type of solution relies on electronic components to achieve the protection function, requiring additional sensors, control chips, and switching elements. The circuit structure is complex and costly, and the reliability of electronic components in high-temperature environments is itself a significant challenge. Another solution is to use polymeric positive temperature coefficient (PPTC) thermistors as overheat protection components. However, PPTCs can automatically resume conduction after the fault is cleared, which is not suitable for scenarios requiring complete power-off for maintenance (such as when the cause of the fault has not been eliminated). Summary of the Invention

[0004] The present invention aims to overcome the shortcomings of the prior art and provide an LED lighting power cord.

[0005] Technical Solution: A power cord includes a first terminal block, a second terminal block, and two conductors. The first terminal block includes a first housing, a sliding seat installed within the first housing and slidable within the first housing, two first conductive seats fixed to the sliding seat, two fixing plates fixed to the first housing, two insulating thermally conductive pads respectively connected to the fixing plates, two shape memory alloy plates respectively fixed to the fixing plates, and two spring contacts fixed to the first housing. Both conductors pass through the first housing and are respectively connected to the two first conductive seats. The first conductive seats are connected to insertion sockets. The second terminal block includes a second housing, a fixing seat fixed within the second housing, and two second conductive seats fixed to the fixing seats. The second conductive seats are connected to insertion brackets that can be inserted between the two insulating thermally conductive pads. The insertion brackets have insertion grooves into which the insertion sockets can be inserted. Both conductors pass through the first housing and are respectively connected to the two first conductive seats. The spring contacts press the shape memory alloy plates, causing the shape memory alloy plates to abut against the insulating thermally conductive pads and causing the insulating thermally conductive pads to abut against the insertion brackets. When the two shape memory alloy plates change from martensitic to austenitic, the insertion sockets can be disengaged from the insertion grooves, thereby breaking the circuit between the insertion sockets and the insertion brackets.

[0006] Furthermore, the first conductive base, the insertion base, the second conductive base, and the insertion holder are all made of metal.

[0007] Furthermore, an anti-reset mechanism is installed inside the first housing. The anti-reset mechanism includes a first end seat fixedly connected to the sliding seat, a second end seat with a first through hole fixedly connected to the first housing, a rod fixedly connected to the first end seat and passing through the first through hole, an end stop fixed to the end of the rod, two first hinge plates hinged to the first end seat, and two second hinge plates hinged to the second end seat. Corresponding first hinge plates and second hinge plates are hinged. The first hinge plate has two first limiting plates, and the second hinge plate has two second limiting plates. The wire is located between the two first limiting plates and between the two second limiting plates. The first housing has a second through hole through which the rod passes and four end limiting plates. The end limiting plates have limiting grooves with a triangular cross-section, and the second limiting plates have limiting protrusions with a triangular cross-section that can be embedded in the limiting grooves.

[0008] Furthermore, when the end block abuts against the first housing, the included angle between the first hinge plate and the second hinge plate that are hinged to each other is between 80 and 89 degrees.

[0009] Thus, when the sliding seat moves backward under the drive of the shape memory alloy, it can more smoothly fold up the first and second hinge plates that are hinged to each other.

[0010] Furthermore, the end limiting plate has an arc-shaped chamfer.

[0011] In some embodiments, the end limiting plate has an arcuate groove.

[0012] This allows the end limiting plate to have better elasticity, and the second limiting plate can squeeze the end limiting plate, causing the limiting protrusion to insert into the limiting groove.

[0013] This makes it easier for the limiting protrusion to be inserted into the limiting groove.

[0014] Furthermore, the phase transition temperature of the memory alloy plate is 85-90 degrees Celsius.

[0015] Furthermore, one end of the shape memory alloy plate is fixedly connected to the fixed plate, and the other end abuts against the sliding seat.

[0016] Furthermore, when the shape memory alloy plate is in martensitic form, it includes a first plate body fixedly connected to a fixed plate, a second plate body connected to the first plate body and abutting against an insulating thermally conductive pad, and a third plate body connected to the second plate body, wherein the cross-section of the third plate body is serpentine.

[0017] Furthermore, the third plate body includes multiple flat plate portions and multiple curved plate portions, with adjacent flat plate portions connected to the curved plate portions.

[0018] As the shape memory alloy plate transforms into austenite, its unfolded length increases, thereby pushing the sliding seat and causing the insert seat to detach from the insert holder.

[0019] Furthermore, the insertion seat includes two first arc surfaces and a second arc surface connecting the two first arc surfaces; the insertion frame includes two third arc surfaces that can respectively abut against two insulating thermally conductive pads, two fourth arc surfaces that can respectively abut against two first arc surfaces, and a fifth arc surface connecting the two fourth arc surfaces and capable of abutting against the second arc surface.

[0020] This allows for better cooperation between the insertion socket and the insertion bracket, and the two have a mutual limiting effect after being inserted.

[0021] Furthermore, the first housing has two first through holes, and two wires pass through the two first through holes respectively and are fixedly connected to the first through holes.

[0022] Furthermore, the second housing has two second through holes, through which two wires pass and are fixedly connected.

[0023] Furthermore, there is sealant between the first perforation and the wire.

[0024] Furthermore, there is sealant between the second perforation and the wire.

[0025] Furthermore, two insulating baffles are fixed at the sliding seat, and the two insertion seats are located between the two insulating baffles; the insulating baffles include an arc-shaped insulating plate and a flat insulating plate connecting the arc-shaped insulating plate and the sliding seat.

[0026] Thus, the insulating baffle can achieve insulation isolation between the shape memory alloy plate and the insertion socket.

[0027] Furthermore, the first housing has two limiting slide rails, and the sliding seat has two limiting slide grooves that respectively cooperate with the two limiting slide rails.

[0028] Furthermore, the first housing, the second housing, and the two spring clips are all made of plastic.

[0029] Beneficial effects: Compared with the prior art, the present invention has the following advantages: 1. Achieving Physical Permanent Power Cut-off for Localized Terminal Overheating: This application introduces a shape memory alloy plate as a thermal response actuator in the power cord's plug-in structure. When the temperature at the terminal rises abnormally due to poor contact, overload, or other reasons, the shape memory alloy plate senses the localized overheating temperature and transforms from a low-temperature martensitic phase to a high-temperature austenitic phase. The shape force generated during this phase transformation drives the insert and insert holder to automatically separate, thus physically cutting off the circuit. Compared to existing overheat protection schemes that rely on electronic sensors and control chips, this application requires no external power supply or complex control logic, offering advantages such as simple structure, reliable response, and immunity to electromagnetic interference.

[0030] 2. Achieving precise and efficient heat transfer at contact points: This application incorporates an insulating thermally conductive pad between the conductive component and the shape memory alloy plate. This pad serves dual functions of electrical insulation and high thermal conductivity. On one hand, it ensures electrical isolation between the shape memory alloy plate and the live component, preventing leakage or short circuits. On the other hand, it efficiently transfers heat from the most heat-generating contact interface to the shape memory alloy plate, enabling it to quickly reach the phase change temperature. This achieves precise sensing of heat at local contact points, avoiding response delays caused by heat loss or thermal hysteresis, and effectively improving the sensitivity and accuracy of overheat protection.

[0031] 3. Achieving irreversible locking after power failure to prevent secondary power-on in fault conditions: This application features a one-way locking structure composed of a limiting protrusion and a limiting groove. When the shape memory alloy plate drives the insert to retract and detach from the insert holder, the limiting protrusion engages in the limiting groove, preventing the insert from resetting towards the insert holder. Even if the fault temperature drops and the shape memory alloy plate returns to the martensitic state, the insert cannot re-establish an electrical connection with the insert holder. This "cooling-free reset" characteristic ensures that the circuit will not be accidentally reconnected before the terminal overheating fault is manually investigated and resolved.

[0032] 4. Achieving zero displacement of the wire fixing end, facilitating maintenance and not interfering with the internal layout of the lamp: During the retraction of the insertion socket, the first and second hinge plates cause the wire to bend and deform, thereby bending the wire inside the first housing and keeping the connection point between the wire and the first housing in a fixed position. Throughout the entire power-off process, the positions of the first terminal, the second terminal, and the wires outside the first and second terminals do not change, thus avoiding pulling on other components inside the lamp caused by position changes. Attached Figure Description

[0033] Figure 1 This is a diagram of the power cord; Figure 2 This is a schematic diagram showing that the first and second terminals are not yet connected. Figure 3 for Figure 2 Enlarged view of region A; Figure 4 for Figure 2 Enlarged view of region B; Figure 5 for Figure 2 Enlarged view of region C; Figure 6 A schematic diagram showing the first and second terminals being plugged together; Figure 7 for Figure 6 Enlarged view of region D; Figure 8 for Figure 6 Enlarged view of region E; Figure 9 This is a schematic diagram showing the insertion seat separating from the insertion holder after an abnormal temperature rise. Figure 10 for Figure 9 Enlarged view of region F; Figure 11 for Figure 9 A magnified view of region G.

[0034] To make it clear, Figure 2-11 In the image, a portion of one side of the first and second housings has been removed to reveal their internal structures. Detailed Implementation

[0035] The present invention will be further illustrated below with reference to specific embodiments. These embodiments are implemented based on the technical solutions of the present invention, and it should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0036] Reference numerals: 1 First housing; 1.1 Sliding seat; 1.2 First conductive seat; 1.3 Insertion seat; 1.3.1 First arc surface; 1.3.2 Second arc surface; 1.4 Fixing plate; 1.5 Insulating thermal pad; 1.6 Spring; 1.7 Shape memory alloy plate; 1.7.1 First plate body; 1.7.2 Second plate body; 1.7.3 Third plate body; 1.8 First end seat; 1.9 First hinge plate; 1.10 First limiting plate; 1.11 Second end seat; 1.12 Second hinge plate; 1.13 Second limiting plate; 1.13.1 Limiting protrusion; 1.14 End limiting plate; 1.14.1 Limiting groove; 1.15 Insert rod; 1.16 Insulating baffle; 1.16.1 Flat insulating plate; 1.16.2 Arc insulating plate; 1.17 Limiting slide rail; 1.18 End stop; 2. Second housing; 2.1 Fixing base; 2.2 Second conductive base; 2.3 Insertion bracket; 2.3.1 Third arc surface; 2.3.2 Fourth arc surface; 2.3.3 Fifth arc surface; 3. Wires.

[0037] As shown in the figure, an LED lamp power cord includes a first terminal block, a second terminal block, and two wires 3. The first terminal block includes a first housing 1, a sliding seat 1.1 installed inside the first housing 1 and slidable within the first housing 1, two first conductive seats 1.2 fixed to the sliding seat 1.1, two fixing plates 1.4 fixed to the first housing 1, two insulating thermally conductive pads 1.5 respectively connected to the fixing plates 1.4, two shape memory alloy plates 1.7 respectively fixed to the fixing plates 1.4, and two spring contacts 1.6 fixed to the first housing 1. Both wires 3 pass through the first housing 1 and are respectively connected to the two first conductive seats 1.2. The first conductive seats 1.2 are connected to insertion seats 1.3. The second terminal block includes a second housing 2. A fixing seat 2.1 is fixed inside the second housing 2, and two second conductive seats 2.2 are fixed to the fixing seat 2.1. The second conductive seats 2.2 are connected to an insertion bracket 2.3 that can be inserted between two insulating thermal pads 1.5. The insertion bracket 2.3 has an insertion groove that can be inserted into by the insertion seat 1.3. Two wires 3 pass through the first housing 1 and are respectively connected to the two first conductive seats 1.2. The spring piece 1.6 presses the shape memory alloy plate 1.7 so that the shape memory alloy plate 1.7 abuts against the insulating thermal pad 1.5 and the insulating thermal pad 1.5 abuts against the insertion bracket 2.3. When the two shape memory alloy plates 1.7 change from martensite to austenite, the insertion seat 1.3 can be disengaged from the insertion groove, thereby breaking the circuit between the insertion seat 1.3 and the insertion bracket 2.3. An anti-reset mechanism is installed inside the first housing 1. The anti-reset mechanism includes a first end seat 1.8 fixedly connected to the sliding seat 1.1, a second end seat 1.11 with a first through hole fixedly connected to the first housing 1, a rod 1.15 fixedly connected to the first end seat 1.8 and passing through the first through hole, an end stop 1.18 fixed to the end of the rod 1.15, two first hinge plates 1.9 hinged to the first end seat 1.8, and two second hinge plates 1.12 hinged to the second end seat 1.11. The corresponding first hinge plates 1.9 and second hinge plates 1.12 are hinged together. The first hinge plate 1.9 has two first limiting plates 1.10, and the second hinge plate 1.12 has two second limiting plates 1.13. The wire 3 is located between the two first limiting plates 1.10 and between the two second limiting plates 1.13. The first housing 1 has a second through hole through which the insertion rod 1.15 passes and four end limiting plates 1.14. The end limiting plates 1.14 have limiting grooves 1.14.1 with a triangular cross-section. The second limiting plates 1.13 have limiting protrusions 1.13.1 with a triangular cross-section that can be embedded in the limiting grooves 1.14.1. When the end stop 1.18 abuts against the first housing 1, the included angle between the hinged first hinge plates 1.9 and the hinged second hinge plates 1.12 is between 80 and 89 degrees.

[0038] The phase transition temperature of the shape memory alloy plate 1.7 is 85-90 degrees Celsius; one end of the shape memory alloy plate 1.7 is fixedly connected to the fixed plate 1.4, and the other end abuts against the sliding seat 1.1; when the shape memory alloy plate 1.7 is in martensite, it includes a first plate body 1.7.1 fixedly connected to the fixed plate 1.4, a second plate body 1.7.2 connected to the first plate body 1.7.1 and abutting against the insulating thermal pad 1.5, and a third plate body 1.7.3 connected to the second plate body 1.7.2, wherein the cross-section of the third plate body 1.7.3 is serpentine. The insertion base 1.3 includes two first arc surfaces 1.3.1 and a second arc surface 1.3.2 connecting the two first arc surfaces 1.3.1; the insertion holder 2.3 includes two third arc surfaces 2.3.1 that can respectively abut against two insulating thermal pads 1.5, two fourth arc surfaces 2.3.2 that can respectively abut against the two first arc surfaces 1.3.1, and a fifth arc surface 2.3.3 connecting the two fourth arc surfaces 2.3.2 and abutting against the second arc surface 1.3.2. The first housing 1 has two first through holes, and two wires 3 pass through the two first through holes and are fixedly connected to them; the second housing 2 has two second through holes, and two wires 3 pass through the two second through holes and are fixedly connected to them. Two insulating baffles 1.16 are fixed at the sliding seat, and two insertion seats 1.3 are located between the two insulating baffles 1.16. Each insulating baffle 1.16 includes an arc-shaped insulating plate 1.16.2 and a flat insulating plate 1.16.1 connecting the arc-shaped insulating plate 1.16.2 and the sliding seat. The first housing 1 has two limiting slide rails 1.17, and the sliding seat 1.1 has two limiting grooves that respectively mate with the two limiting slide rails 1.17. The first housing 1, the second housing 2, and the two spring pieces 1.6 are all made of plastic.

[0039] The power cord for the lamp in this application is shown in the figure. The two ends of the power cord have a first terminal and a second terminal, respectively. Therefore, multiple power cords can be connected together for use. Other components inside the lamp can be equipped with the same first terminal or second terminal. Thus, when in use, the first terminal and the second terminal can be plugged in to achieve a conductive connection.

[0040] During installation, the end stop is abutted against the first housing, positioning the sliding seat close to the opening of the first housing. The second and first terminals are then inserted together, allowing the insert holder to be inserted between the two insulating thermal pads, and the insert seat to be inserted into the insertion groove. Two springs provide clamping force, and the insert holder itself also has clamping force, ensuring a stable connection between the insert seat and the insert holder, and enabling electrical conductivity. As the shape memory alloy sheet presses against the insert holder, its heat is transferred to the shape memory alloy sheet via the insulating thermal pads. When the temperature rises to the phase transformation temperature, the shape memory alloy sheet transforms from martensite to austenite, causing it to push the sliding seat to move (and maintaining contact with the insulating thermal pads during deformation). This causes the insert seat to disengage from the insertion groove, thus de-energizing the insert seat and insert holder. During this process, the first end seat moves towards the second end seat, the first hinge plate and the second hinge plate fold, and the wire can bend within the first housing due to the limitation of the first and second limiting plates, thus achieving bending of the wire within a preset range, while the wire outside the first housing can maintain its position. When the first end seat moves to the designated position, the first limiting plate abuts against the end limiting plate, and the final limiting protrusion inserts into the limiting groove. Thus, the limiting protrusion and the limiting groove achieve limitation, and even if the temperature decreases subsequently, the first end seat cannot move further, thereby preventing the insertion seat from being inserted into the insertion holder to achieve conductivity.

[0041] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A power cord for an LED lamp, comprising a first terminal block, a second terminal block, and two wires, characterized in that, The first terminal block includes a first housing, a sliding seat installed inside the first housing and slidable within the first housing, two first conductive seats fixed to the sliding seat, two fixing plates fixed to the first housing, two insulating thermally conductive pads respectively connected to the fixing plates, two shape memory alloy plates respectively fixed to the fixing plates, and two spring contacts fixed to the first housing. Two wires pass through the first housing and are respectively connected to the two first conductive seats. Each first conductive seat is connected to an insertion socket. The second terminal block includes a second housing, a fixing seat fixed inside the second housing, and two second conductive seats fixed to the fixing seats. Each second conductive seat is connected to an insertion bracket capable of being inserted between two insulating thermally conductive pads. The insertion bracket has an insertion groove into which the insertion socket can be inserted. Two wires pass through the first housing and are respectively connected to the two first conductive seats. The spring contacts press the shape memory alloy plates, causing the shape memory alloy plates to abut against the insulating thermally conductive pads and causing the insulating thermally conductive pads to abut against the insertion brackets. When the two shape memory alloy plates change from martensitic to austenitic, the insertion sockets can disengage from the insertion grooves, thereby breaking the circuit between the insertion sockets and the insertion brackets. An anti-reset mechanism is installed inside the first housing. The anti-reset mechanism includes a first end seat fixedly connected to the sliding seat, a second end seat with a first through hole fixedly connected to the first housing, a rod fixedly connected to the first end seat and passing through the first through hole, an end stop fixed to the end of the rod, two first hinge plates hinged to the first end seat, and two second hinge plates hinged to the second end seat. Corresponding first hinge plates and second hinge plates are hinged. The first hinge plate has two first limiting plates, and the second hinge plate has two second limiting plates. The wire is located between the two first limiting plates and between the two second limiting plates. The first housing has a second through hole through which the rod passes and four end limiting plates. The end limiting plates have limiting grooves with a triangular cross-section, and the second limiting plates have limiting protrusions with a triangular cross-section that can be embedded in the limiting grooves. The phase transition temperature of the memory alloy plate is 85-90 degrees Celsius; one end of the memory alloy plate is fixedly connected to the fixed plate, and the other end abuts against the sliding seat; when the memory alloy plate is in martensite, it includes a first plate body fixedly connected to the fixed plate, a second plate body connected to the first plate body and abutting against the insulating thermal pad, and a third plate body connected to the second plate body, wherein the cross section of the third plate body is serpentine.

2. The LED lamp power cord according to claim 1, characterized in that, The insertion seat includes two first arc surfaces and a second arc surface connecting the two first arc surfaces; the insertion frame includes two third arc surfaces that can respectively abut against two insulating thermally conductive pads, two fourth arc surfaces that can respectively abut against two first arc surfaces, and a fifth arc surface connecting the two fourth arc surfaces and capable of abutting against the second arc surface.

3. The LED lamp power cord according to claim 1, characterized in that, The first housing has two first through holes, and two wires pass through the two first through holes respectively and are fixedly connected to the first through holes; the second housing has two second through holes, and two wires pass through the two second through holes respectively and are fixedly connected to the second through holes.

4. The LED lamp power cord according to claim 1, characterized in that, Two insulating baffles are fixed at the sliding seat, and the two insertion seats are located between the two insulating baffles; the insulating baffles include an arc-shaped insulating plate and a flat insulating plate connecting the arc-shaped insulating plate and the sliding seat.

5. The LED lamp power cord according to claim 1, characterized in that, The first housing has two limiting slide rails, and the sliding seat has two limiting slide grooves that respectively cooperate with the two limiting slide rails.

6. The LED lamp power cord according to claim 1, characterized in that, The first housing, the second housing, and the two spring clips are all made of plastic; when the end block abuts against the first housing, the included angle between the first hinge plate and the second hinge plate that are hinged to each other is between 80 and 89 degrees.

Images