49 results about "Resettable fuse" patented technology

The invention relates to a power equipment self-repairing surge protection system based on artificial intelligence, and the system is characterized in that a surge detection module is connected between a live wire and a protection ground wire of power equipment, collects voltage and current data, and transmits the data to an artificial intelligence analysis unit; and the artificial intelligence analysis unit extracts the surge characteristic parameters, generates protection strategy parameters through a deep neural network, and controls the trigger thresholds of all levels of protection devices in the programmable protection circuit. The programmable protection circuit comprises a gas discharge tube capable of adjusting trigger voltage, a metal oxide varistor and a transient voltage suppressor diode, and is used for discharging surges with different energies step by step. The resettable fuse cuts off the circuit when the temperature exceeds a threshold value and recovers conduction after the temperature is reduced. And the controller receives and applies the protection strategy parameter output by the artificial intelligence analysis unit, and dynamically adjusts the trigger threshold value of the protection device, so that the response and protection performance of the system to the surge is improved, and the self-repairing and stable operation of the power equipment are realized.

The utility model provides a short-circuit protection circuit for a Type-C interface, and belongs to the technical field of short-circuit protection circuits. Comprising an interface module, an overvoltage and electromagnetic protection circuit and a switching circuit, the interface module, the overvoltage and electromagnetic protection circuit and the switching circuit are connected in series on the same power line and grounding line, and a common circuit and a standby circuit are arranged in the switching circuit and are both connected with the power line. According to the utility model, through the cooperation of the resettable fuse, the double-pole double-throw relay and other elements, the circuit can be rapidly switched so as to ensure that the interface can continue to work normally without maintenance when a short-circuit fault occurs, and through the synergistic effect of the gas discharge tube, the first transient suppression diode, the second transient suppression diode, the electrolytic capacitor and other elements, the short-circuit fault of the interface can be effectively prevented. The problems of overvoltage and electromagnetic interference during short circuit can be effectively relieved.

The utility model discloses a self-protection circuit suitable for an energy storage pre-charging loop. The cathode of an energy storage power supply is connected with a cathode relay K1, and the anode of the energy storage power supply is sequentially connected with a main loop fuse F1 and an anode relay K2; the pre-charging resettable fuse F2 is sequentially connected with a pre-charging relay K3, a pre-charging resistor R1 and an anti-reverse diode D2 in series, and a series circuit is connected to the two ends of the K2 in parallel; two ends of a control coil of the K3 are respectively connected with positive and negative electrodes of a diode D1; one end of the resistor R2 is connected with a control signal P1, and the other end of the resistor R2 is connected with the resistor R3 and the base electrode of the triode Q1; the collector electrode of the triode Q1 is connected with one end of a control coil of the pre-charging relay K3 and the positive electrode of the diode D1, and the emitter electrode is grounded; the negative electrode of the diode D1 and the other end of the control coil of the relay K3 are connected with a power supply VCC through S1. According to the utility model, the self-protection of the pre-charging circuit can be realized when the pre-charging circuit performs the pre-charging action and the external load is short-circuited.

The invention relates to the technical field of electrical control and circuit protection, and discloses an anti-overcurrent building controller which comprises a protection mechanism, a sealing mechanism is arranged on the front face of the protection mechanism, a control mechanism is arranged at the bottom of the protection mechanism, and the outer side of the control mechanism is fixedly connected with the interior of the protection mechanism. And the outer side of the sealing mechanism is inserted into the protection mechanism. According to the building controller with the anti-overcurrent design, the reliability and redundancy of overcurrent protection are improved, when a certain resettable fuse breaks down, other resettable fuses can still work normally, accurate protection of a circuit is achieved, damage to the service life of the circuit is reduced, early warning information is sent to a monitoring center and wireless communication equipment through the controller, and the safety of the monitoring center and the wireless communication equipment is improved. And the safety of the equipment is remotely processed, so that a worker can conveniently manage a plurality of building controllers in a centralized manner, know the operation state of the equipment in real time and perform unified scheduling and management, and maintenance personnel do not need to run around to check the situation.

The utility model relates to the technical field of industrial automation, in particular to a digital measurement and control instrument of a mechanical switch closing resistor. Comprising a power supply adjusting circuit module which is provided with a 24VDC power supply input end, and the 24VDC power supply input end is connected with a resettable fuse F1 through an anti-reverse diode D2 and then is connected with the input end of a switching power supply voltage adjusting chip U1. According to the utility model, the dynamic constant current source controlled by the high-precision DAC and the built-in 24b-it analog-to-digital converter of the NSA2860 chip are integrated, so that a multi-mode excitation current regulation and control mechanism is constructed. Based on real-time voltage drop signal analysis of an MCU, the system automatically triggers a relay to switch an excitation loop to a precise sampling resistor for online calibration, obtains a precise current value under current DAC output and stores calibration parameters, and cooperative control of nanoampere-level current resolution and milliohm-level resistance measurement is achieved.

1. Name of the designed product: solid state relay (resettable fuse). 2. Use of the designed product: used in control circuit. 3. Design points of the designed product: in shape. 4. Picture or photo that best shows the design points: front view.

The invention discloses an electromagnetic valve open and short circuit detection system for energy storage, and the system comprises an input voltage detection module which is used for detecting the power supply voltage of an electromagnetic valve; the current detection module is used for detecting the current when the electromagnetic valve works; the voltage detection module is responsible for detecting post-stage voltage of the resettable fuse; the differential voltage detection module is used for detecting a voltage difference value when the electromagnetic valve is used; the output control module can control the on-off of the electromagnetic valve; and the single-chip microcomputer micro-control module can collect detection values of the input voltage detection module, the current detection module, the voltage detection module and the differential voltage detection module and regulate and control the output control module according to the detection values. According to the system, the open circuit state and the short circuit state of the electromagnetic valve can be detected at the same time, the whole scene where 24V voltage is not provided and 24V driving voltage is provided is covered, the problem that a traditional detection circuit is single in function is solved, and comprehensive monitoring of the working state of the electromagnetic valve is achieved by accurately collecting voltage signals of all modules.

The utility model relates to the technical field of electronic parts, in particular to an intelligent protection circuit for an automobile windscreen wiper based on a PPTC (Polymeric Positive Temperature Coefficient) resettable fuse. Comprising a wiper motor control circuit, a wiper motor, a gear switch and a protection circuit, the wiper motor control circuit controls the wiper motor through the gear switch, and the protection circuit is connected with the wiper motor control circuit, the wiper motor and the gear switch. The protection circuit comprises a PPTC resettable fuse overcurrent protection circuit, an RV voltage dependent resistor overvoltage protection circuit, isolation filter inductors L1 and L2, a capacitor C1 and a capacitor C2. According to the utility model, the number of components is small, the occupied volume is small, the cost is lower, the reliability is higher, related potential safety hazards or problems can be well solved, the repair and maintenance become simpler, and the market competitive advantage can be obviously improved.

The utility model relates to the technical field of electronics, in particular to an intelligent magnetic pulse therapeutic apparatus circuit based on a PPTC resettable fuse. A second resettable fuse PPTC and a first resettable fuse PPTC are respectively connected in series between a switching voltage-stabilized power supply of a pulse therapeutic instrument main control computer and a mains supply and between a power conversion controller and the mains supply, a resettable fuse PPTC is connected in series between an MOS tube and an overvoltage protection device, and a magnetic pulse coil is controlled through a pulse output gear regulator. According to the utility model, not only can a series of problems of more components, large occupied space, high failure rate and the like in the traditional scheme be solved, especially current-limiting protection of short circuit be realized, but also artificial and non-artificial short circuit protection can be completed on a circuit system, so that the conditions of circuit burnout and serious fire caused by short circuit can be avoided.

The present invention discloses a charging pile power supply circuit for a TBOX power supply. The circuit includes an anti-reverse polarity diode D85, an anti-reverse polarity diode D86, a resettable fuse F5, a transient suppressor diode D87, an anti-reverse polarity diode D88, and an output capacitor C12. The positive and negative interfaces of the charging input of the charging pile are respectively connected to one input end of the resettable fuse F5 after passing through D85 and D86. The other end of the resettable fuse F5 is connected to the positive electrode of D88, the negative electrode of D88 is connected to one end of the capacitor C12, and the other end of the capacitor C12 is grounded. Power supply output terminals are respectively drawn from both ends of the capacitor C12, and the power supply output terminals are used to connect to the TBOX. A terminal is drawn between the resettable fuse F5 and D88 to connect to the negative electrode of the transient suppressor diode D87, and the positive electrode of the transient suppressor diode D87 is grounded. The circuit structure of the present invention is simple, and it can achieve normal power supply when the charging pile has abnormal high voltage fluctuations. After the circuit is damaged, it can detect faults immediately, give an alarm reminder, and promptly discover hardware faults in the circuit.

The invention relates to a charging circuit of a shared communication bus, and aims to solve the problem that a traditional charging mode needs to occupy extra cable space and is limited in charging power. A charging function is realized by multiplexing a communication bus, and the device comprises a solid-state relay isolation module, a circuit voltage division module and a power supply access module. Wherein the solid-state relay isolation module detects bus voltage in real time, and when the voltage exceeds a threshold value (greater than or equal to 20V), the solid-state relay isolation module is automatically switched to a charging mode and isolates the communication chip; the circuit voltage division module accurately detects voltage through voltage division resistors R3, R4 and R5, and the resistance value of the circuit voltage division module meets the relational expressions # imgabs0 # and # imgabs1 # to ensure reliable switching between a communication mode and a charging mode; the power supply access module adopts back-to-back NMOS switches (VT1-VT4) and a photoelectric coupling driver, and bus high voltage is safely led into a power supply network. The communication chip is protected from transient high-voltage impact through the clamping diode and the resettable fuse, meanwhile, a special charging cable is omitted, the proportion of a charging circuit is remarkably reduced, and the charging power is improved.

The utility model discloses a resettable fuse with a protective cover, which belongs to the technical field of resettable fuses, and comprises a bottom plate, the surface of the bottom plate is rotatably connected with a protective cover body through a hinge, the surface of the bottom plate is fixedly connected with two supporting plates, the surface of the bottom plate is fixedly connected with two clamping rings, and the protective cover body is fixedly connected with the clamping rings. A fuse body is clamped on the surfaces of the two clamping rings, the other clamping ring is fixedly connected to the inner wall of the protective cover body, grooves are formed in the two ends of the protective cover body, a limiting block is fixedly connected to the surface of the bottom plate, a limiting assembly is fixedly connected to the surface of the protective cover body, and the limiting assembly comprises a shell, a sliding block, an insertion rod and a spring. Through the arrangement of the plurality of clamping rings, the fuse body can be conveniently clamped and fixed, through the arrangement of the bottom plate and the protective cover body, the fuse body can be conveniently protected, and through the arrangement of the two supporting plates, a wire of the fuse body can be conveniently supported.

A terminal assembly, arranged for an automobile harness, comprising: a substrate; a modified terminal, arranged as a plate structure that is arranged on the substrate and extends perpendicularly with respect to a plane of the substrate; and a resettable fuse component, the resettable fuse component comprising a polymer positive temperature coefficient (PPTC) material, and coupled in series with the modified terminal.

The utility model provides a DC power supply input protection circuit, which is characterized in that the circuit comprises a self-recovery fuse F1 and a second diode D2, the first end of the self-recovery fuse F1 is electrically connected with a power supply input end, and the second end of the self-recovery fuse F1 is electrically connected with a power supply output end; the anode of the second diode D2 is grounded, and the cathode of the second diode D2 is electrically connected with the second end of the resettable fuse F1. When the positive electrode and the negative electrode of the input power supply are reversely connected, the second diode D2 is conducted and forms a loop with the resettable fuse F1 and the power supply input end, the resettable fuse automatically disconnects the circuit due to large current, and the effect of protecting a post-stage circuit due to reverse connection of the positive electrode and the negative electrode is achieved. Therefore, the utility model provides a hardware architecture, and safety protection can be carried out on reverse insertion of the positive electrode and the negative electrode of the direct-current power supply of the charging circuit through circuit integrated design.

The invention discloses a battery management circuit module and mobile power supply equipment. The battery management circuit module comprises an external connection port, a battery connection port, a bidirectional power conversion unit, a charging and discharging switch unit, a non-resettable fusing unit and an intelligent management unit. Wherein the bidirectional power conversion unit is used for performing bidirectional voltage conversion between an external connection port and a power bus node; the charging and discharging switch unit and the non-resettable fusing unit are connected in series between the power bus node and the positive electrode interface of the battery connection port to form a high-side protection framework; the intelligent management unit is used for calculating the electric quantity state based on an impedance tracking algorithm and outputting a driving signal to the non-resettable fusing unit when a fault is detected. According to the invention, a high-side protection architecture is adopted to ensure stable communication, and a fault loop is physically cut off in combination with an active fusing mechanism, so that the safety and reliability of high-power fast charging are improved.

An intrinsically safe battery assembly includes a battery pack including at least one battery and a protection circuit connected in series with the battery pack. The protection circuit includes the following elements connected in series: at least one diode configured to prevent the battery pack from being reversely charged, at least one current limiting resistor configured to provide short circuit protection and a resettable fuse configured to provide over current protection.

The utility model discloses an electric energy meter communication module, comprising a control side circuit having a power supply end and a reference ground end; the isolation side circuit is provided with a power supply end and a reference ground end and is used for connecting a bus; a first optocoupler; a second optocoupler; a third optocoupler; a transceiver; a first transistor; the second transistor is arranged on the isolation side circuit, the base electrode of the second transistor is connected with the output end of the second optocoupler, and the collector electrode of the second transistor is connected with the sending input end of the transceiver; the bidirectional transient voltage suppressor is connected to the differential signal input / output end of the transceiver; and the self-recovery fuse is connected in series between the differential signal input / output end of the transceiver and the bus. The electric energy meter communication module has the following beneficial effects that the electric energy meter communication module has the characteristics of high anti-interference capability, high reliability, high safety and convenience in maintenance.

The utility model discloses an overvoltage protection and sensing circuit and an analog input detection device. Relates to the technical field of analog quantity detection. According to the scheme, on the basis of a traditional analog quantity input detection technology, the structure is improved; the self-recovery fuse F1 and the transient suppression diode TVS1 are utilized to generate voltage difference at two ends of the self-recovery fuse during overvoltage, and the PMOS tube Q1 is switched on when negative voltage is generated at two ends of the G pole and the S pole by utilizing the conduction characteristic of the PMOS tube Q1. The two are ingeniously combined, that is, the voltage difference generated at the two ends of the resettable fuse is applied to the G pole and the S pole of the PMOS tube Q1 to sense overvoltage; therefore, the purposes of simplifying devices and saving material cost are achieved, the current consumption of analog signals is reduced, the sensing circuit almost has no leakage current in a normal state, and the influence on the signals is reduced.

The utility model relates to the technical field of electronic circuits, in particular to an intelligent card swiping scanning and reading equipment protection circuit based on a PPTC resettable fuse. A voltage input end of the power conversion circuit is connected with a PPTC1 and a TVS1 which are connected in series during DC power supply, a voltage input end of the power conversion circuit is connected with a PPTC2 and a TVS2 which are connected in series during lithium battery power supply, a PPTC3 is connected between the MOS tube Q1 and the intelligent card induction and identification circuit, and a PPTC4 and a PPTC5 are connected between the power conversion circuit and the data read-write storage and transmission circuit. The card swiping device is small in size, low in cost and high in reliability, and can be applied to all card swiping related product equipment in various fields of buses, hospitals, shopping malls, supermarkets and the like.

The utility model discloses a heat dissipation type resettable fuse, and relates to the technical field of fuses, the heat dissipation type resettable fuse comprises a resettable fuse and a protection box, the resettable fuse is arranged in the protection box, and a sliding assembly and a heat dissipation assembly are respectively arranged in the protection box. According to the technical scheme of the utility model, the heat dissipation fan connecting column is installed inside the installation frame, and then the installation frame is installed at the window disposed at the bottom of the protection box, so that a worker can conveniently carry out heat dissipation when the resettable fuse stops working due to the overheating of the resettable fuse. The heat dissipation fan blows air to dissipate heat, so that the effect of rapid cooling is achieved, the heat dissipation net connected to the bottom of the mounting frame can facilitate air entering when the heat dissipation fan works, so that the heat dissipation effect is improved, heat dissipation can be conducted on the heat dissipation fan through the external power source, and meanwhile workers can conveniently control the heat dissipation fan to be turned on and turned off.

The utility model discloses a low-voltage power supply input protection circuit, which comprises a power supply input end, a voltage stabilizing diode, a resettable fuse, a filter capacitor and a Schottky diode, the voltage stabilizing diode is connected between the power supply input ends and is used for overvoltage protection; the resettable fuse is connected in series with the positive electrode of a power supply and is used for overcurrent protection; the filter capacitor is connected in parallel with a power supply input end and is used for filtering high-frequency noise and stabilizing power supply input voltage; and the Schottky diode is connected in series with the power supply input end and is used for polarity protection. The low-voltage power supply input protection circuit can effectively improve the reliability and stability of power supply input, protect circuit elements from being influenced by overvoltage, overcurrent and reverse connection, and ensure the stable operation of a system.

The invention discloses a capacitor aging transient current short circuit elimination method, and relates to the technical field of capacitors, and the capacitor aging transient current short circuit elimination method comprises the following steps: S1, using an overcurrent protection circuit; s2, using a current-limiting resistor; s3, using a transient voltage suppressor; s4, using automatic detection and data monitoring; s5, a thermistor (PTC) and an MOSFET switch are used after the step S4, and a fuse and a resettable fuse are additionally installed at the front end of a capacitor in the circuit in the step S1; the method for installing the fuse at the front end of the capacitor is the simplest method. According to the method for eliminating the short circuit of the capacitor aging instant current, the automation degree of the device is improved through S4 and S5, the short-circuit capacitor can be detected in time before the capacitor enters the aging machine, and the short-circuit capacitor is eliminated, so that the short-circuit capacitor is prevented from influencing the aging work of other normal capacitors, and the service life of the capacitor is prolonged. Therefore, the stable output of the product is improved.

The utility model relates to the technical field of fuses, and particularly discloses a patch type resettable fuse, which comprises a fuse structure and a rotating frame, two ends of the rotating frame are respectively and fixedly provided with a wire holder I and a wire holder II, the wire holder I comprises an L-shaped metal seat and a concave hole, a spring is fixedly arranged in the concave hole, a metal ball head column is fixedly arranged outside the spring, and the metal ball head column is fixedly connected with the rotating frame. The fuse structure comprises a first fuse box, an insulating plate and a second fuse box which are sequentially and fixedly connected from top to bottom. According to the technical scheme of the utility model, the spring is matched with the metal ball head column, so that the metal ball head column is elastically matched with the ball head hole of the fuse structure in a limiting manner, and the fuse structure is provided with the two independent fuse boxes. And the rotatable fuse structure is quickly switched to another unused fuse box, so that the normal use of the electrical equipment is quickly recovered.

The embedded multifunctional acquisition control circuit comprises an MCU control circuit, a relay circuit, a 485 circuit and a dry contact circuit, the relay circuit, the 485 circuit and the dry contact circuit are respectively connected with the MCU control circuit, and the 485 circuit comprises an RS-485 / 422 transceiver, a resettable fuse and a TVS tube implementation circuit. The TVS tube implementation circuit is electrically connected with the RS-485 / 422 transceiver through the resettable fuse, and the RS-485 / 422 transceiver is connected with the MCU control circuit. Compared with the prior art, the RS-485 / 422 transceiver has high electrical isolation, the dry contact circuit with 16 dry contacts is adopted, configuration can be carried out according to actual requirements of customers, unnecessary redundant interfaces are reduced, and the requirements of industrial application are met.

The utility model relates to the technical field of resettable fuses, and discloses a combined resettable fuse which comprises a fuse body, the outer wall of the fuse body is fixedly connected with pins, the outer wall of the fuse body is provided with a connecting shell, the outer wall of the connecting shell is connected with an extension shell in a sliding mode, the inner wall of the extension shell is provided with a connecting assembly, and the connecting assembly is fixedly connected with the pins. A through hole is formed in the connecting shell in a penetrating mode, a limiting groove is formed in the connecting shell, and a fixing assembly is installed on the outer wall of the connecting shell. The connecting assembly comprises a limiting protruding block. According to the utility model, the fuse body is placed in the connecting shell and is fixed through the elasticity of the connecting shell; the other connecting shell is placed on the side of the extension shell, the extension shell slides to enable the limiting blocks to slide in the sliding grooves, and then the clamping blocks are clamped into the positioning grooves, so that a plurality of fuse bodies are quickly combined for use, the operation is simple and convenient, and the practicability and adaptability of the fuse in different scenes are improved.

The invention discloses a high-power intelligent seedling raising machine master control circuit based on ESP32-S3 chip design, which comprises a master control circuit based on ESP32-S3-WROOM as a core design, a voice interaction circuit composed of a power amplifier circuit based on MAX98357 as a core design and a microphone circuit based on EV-INMP441 as a core design, and an expansion circuit based on MCP23017 as a core. The high-power power supply circuit consists of a high-power power supply adjusting circuit taking JWH6344 as a core and a voltage stabilizing circuit taking AMS117 as a core, and the direct external equipment circuit consists of a key downloading circuit, a sensor serial port downloading interface circuit, a WS2812 light bar interface circuit and a steering engine interface circuit. The high-power power supply interface circuit is composed of an XT60 interface circuit and a 15A resettable fuse circuit, the motor control circuit, the fan control circuit, the heating rod control circuit and the semiconductor refrigeration control circuit are designed based on an optocoupler control circuit, and the humidifier control circuit, the water pump control circuit and the reserved interface circuit are designed based on an mos tube control circuit.

This invention discloses a voltage and current limiting circuit for transformer output and a power supply device for explosion-proof floodlights, comprising: multiple voltage and current limiting modules connected in sequence, each module including a diode, a resettable fuse, a thyristor, and a resistor; this voltage and current limiting circuit can effectively limit the voltage and current jumps of the high-frequency pulse current output by the transformer, ensuring the stability and safety of the subsequent circuits, and its design is simple and low-cost, fully meeting the requirements of explosion-proof standards. Furthermore, due to the use of resettable fuses and thyristors, the voltage and current limiting circuit can maintain stable performance even under long-term high-load operation, without performance degradation or damage due to temperature rise, thereby greatly improving the overall safety and stability of the explosion-proof floodlight power supply device.

The utility model discloses a resettable fuse device, and particularly relates to the technical field of resettable fuses, which comprises a bottom protective sleeve, a top protective sleeve is arranged on the outer side of the upper end of the bottom protective sleeve, a limiting support block is arranged on the end face of the lower side of the bottom protective sleeve, and a concave mounting groove is formed in one side of the upper end of the bottom protective sleeve. A convex limiting protruding block is arranged on the outer end face of the concave mounting groove, a limiting clamping plate is arranged on one side of the lower end of the top protection sleeve, and a concave limiting clamping groove is formed in the inner side end face of the limiting clamping plate. When the self-recovery fuse is actually used, the self-recovery fuse main body can be conveniently installed under the corresponding arrangement state of the concave groove, the strip-shaped limiting groove, the self-recovery fuse main body, the fuse pins and the beeswax sealing block, and meanwhile the self-recovery fuse main body can be conveniently installed under the adaptive state of the concave limiting clamping groove and the convex limiting convex block. And the closing stability of the bottom protection sleeve and the top protection sleeve can be effectively improved, so that the resettable fuse main body can be conveniently protected.

The utility model discloses a raw material internal mixer for production of resettable fuses, and relates to the technical field of resettable fuse production, the raw material internal mixer comprises an internal mixer body, two stirring rotors and a working table, the two stirring rotors are respectively installed on the front wall surface of the internal mixer body, the working table is installed on the front wall surface of the internal mixer body, and the working table is installed on the front wall surface of the internal mixer body. Four guide rods are installed on the front wall face of the internal mixer body, two convex guide rails are installed on the upper wall face of the internal mixer body, an internal mixing structure is installed on the outer wall faces of the four guide rods, a guide structure is installed on the outer wall face of the internal mixing structure, and a stripping structure is installed on the front wall face of the internal mixer body. A material sealing structure is mounted on the front wall surface of the internal mixing structure; the internal mixer has the advantages that horizontal movement of the internal mixer box is achieved through the two convex guide rails and the two sliding rods, vertical movement of the internal mixer box is achieved through cooperation of the two hydraulic rods and the two telescopic sleeves, and contact between an operator and the internal mixer box is reduced through the internal mixer handle.

The utility model provides a weather-resistant PPTC resettable fuse. The weather-resistant PPTC resettable fuse comprises a packaging frame body and a chip main body, the packaging frame body is configured into a regular rectangular structure; the chip main body is made of a positive temperature coefficient composite material; the positive temperature coefficient composite material at least comprises polyvinylidene fluoride and conductive particles; the chip main body comprises a first chip layer and a second chip layer; the first chip layer is located on the upper layer and the right side of the first chip layer is hollowed to form a first abdicating area used for avoiding the right electrode. The second chip layer is located on the lower layer and the left side of the second chip layer is hollowed to form a second abdicating area used for avoiding the left electrode. A hollow through space is formed in the middle area of the packaging frame body, and the first chip layer and the second chip layer are adaptively embedded in the through space in a press fit manner; compared with the prior art, a simpler packaging frame body is adopted, production and installation are facilitated, the overall mechanical strength and stability can be effectively improved, and the rectangular packaging frame body is beneficial to ensuring reasonable layout of the PPTC chip and facilitating electrical connection and heat dissipation design.