229 results about "Circuit protection" patented technology

This invention designs a short-circuit prevention structure for the cathode body in electrolytic machining of small-diameter tube bores. By adding a composite structure of an "annular drainage groove + gradually widening directional drainage groove" to the traditional rear guide zone, it solves the problems of uneven flow field distribution and ablation short circuits caused by poor electrolyte drainage and accumulation at the tail end of the working tooth machining area during traditional cathode body electrolytic machining of tube bores. Specifically, the annular drainage groove is placed at the front end of the rear guide zone, utilizing the potential energy of the annular groove to rapidly guide the electrolyte retained at the end of the working tooth to the annular groove, achieving uniform circumferential distribution of the electrolyte introduced by the rear guide zone and reducing excessive accumulation of electrolyte waste at the end of the working tooth. The gradually widening directional drainage groove starts from the end of the working tooth and gradually widens along the spiral angle of the working tooth, effectively providing electrolyte drainage and ensuring that the electrolyte flow from the end of the working tooth to the drainage groove always proceeds stably forward along the spiral structure. The combination of these two structures effectively solves the short-circuit problem at the end of the traditional cathode body.

This invention discloses a thermoelectric module with intrinsic open-circuit protection and its protection method. The thermoelectric module includes multiple thermoelectric units connected in series and at least one bidirectional protection device. The bidirectional protection device is connected in parallel with at least one of the thermoelectric units and is a semiconductor device with bidirectional avalanche breakdown characteristics. Its breakdown voltage satisfies: where is the normal operating terminal voltage of the thermoelectric unit, α is the absolute value of the Seebeck coefficient, is the maximum design temperature difference, and is the voltage across the faulty unit during an open-circuit fault. During normal operation, the protection device is high-resistance cutoff; during a fault, it avalanche conduction forms a bypass. This invention also provides an open-circuit protection method for the thermoelectric module, including a threshold determination step and a voltage triggering step. This invention achieves hardware-level passive fault tolerance, with fast response speed and high reliability.

This application provides a short-circuit protection circuit, a short-circuit protection device, and a vehicle. The short-circuit protection circuit includes a trigger circuit and a first isolation device, with the trigger circuit connected to the first isolation device. The trigger circuit is used to: sample a first voltage of the charging circuit; output a first signal to the first isolation device based on the first voltage; and the first isolation device is used to disconnect the charging circuit when the first signal corresponds to a short-circuit condition. Through the technical solution of this application embodiment, the trigger circuit controls the conduction and disconnection of the first isolation device by directly outputting a signal to it. This results in a very fast response speed, achieving microsecond-level control, enabling rapid disconnection of the charging circuit even in the event of a short circuit, thus protecting the battery pack from damage.

This invention proposes a multi-channel DC adjustable intelligent electronic circuit breaker, specifically relating to the field of circuit protection technology. It includes an MCU module; a power supply connected to the MCU module; a current adjustment knob (KNOB) connected to the MCU module; at least one intelligent fuse connected to both the power supply and the MCU module, with each intelligent fuse corresponding to a load connected to its respective channel; one-time fuses corresponding to the intelligent fuses; and a Bluetooth unit built into the MCU module. By configuring the MCU module, designing the current adjustment knob (KNOB) on the MCU module, and designing intelligent fuses on each load-connected path, the short-circuit protection response time of the multi-channel DC adjustable intelligent electronic circuit breaker proposed in this invention is improved by one level, from the microsecond (µs) level to the nanosecond (ns) level.

This invention provides a high-voltage suppression and voltage regulation protection circuit, relating to the field of circuit protection technology. The circuit includes a high-voltage discharge elimination circuit, a π-type composite EMI filter network circuit, and a voltage regulator circuit connected in sequence, with terminals at both the input and output ends. The high-voltage discharge elimination circuit consists of four DC spark discharge tubes and two varistors. The π-type composite EMI filter network circuit includes two high-voltage ceramic capacitors, two inductors, and one common-mode inductor. The voltage regulator circuit consists of an electrolytic capacitor and a Zener diode. Through the synergistic effect of the front-stage high-voltage elimination, intermediate-stage filtering, and rear-stage voltage regulation, the circuit achieves suppression and voltage regulation protection against high-voltage interference ranging from kilovolts to tens of kilovolts, ensuring continuous normal operation of the circuit system under harsh high-voltage environments.

The application relates to the technical field of circuit protection, in particular to a transient overvoltage protection device with active isolation and reconstruction functions, and discloses a system named a transient overvoltage protection device with active isolation and reconstruction functions, which aims to solve the problems of single-point failure and protection interruption caused by performance degradation of metal oxide varistors. The device comprises a main / auxiliary discharge path, a state sensing module and a central cooperative controller; by monitoring the leakage current, temperature and clamping voltage in real time, the controller actively turns off the main path before the element deteriorates and switches to the standby path in milliseconds, so that the reconstruction is realized without disturbance. The scheme ensures that the protection function is continuously effective, and significantly improves the system resilience and power supply safety.

The application relates to a protection circuit of an LLC resonant converter and a display device. The LLC resonant converter comprises an LLC control chip and a half-bridge power circuit. The protection circuit comprises: a power-off detection module configured to output a power-off detection signal when detecting that a reference voltage is lower than a preset threshold; a shutdown control module configured to pull down the voltage of a protection pin to be lower than a shutdown threshold in response to the power-off detection signal, so that the LLC control chip stops outputting a driving signal; a delay start module configured to generate a delay signal to maintain the pull-down state of the protection pin by the shutdown control module during the delay period when the reference voltage is not lower than the preset threshold; and a bleeding module configured to bleed the energy in a resonant cavity after the LLC control chip stops outputting the driving signal. The problem that the MOS is damaged due to the fast switching-off of the LLC resonant converter is solved.

A short-circuit protection circuit, a short-circuit protection method, and an electric vehicle are disclosed, relating to the field of electric vehicle technology. The short-circuit protection circuit includes a sensing resistor, a voltage comparator, and an MCU. The primary circuit of a push-pull switching circuit is grounded through the sensing resistor, and the push-pull switching circuit provides a driving voltage to the MCU's driving circuit. The first input terminal of the comparator is connected to a reference voltage, and the second input terminal of the comparator is connected to the first terminal of the sensing resistor, the second terminal of the sensing resistor being grounded. The comparator outputs a low level when the reference voltage is less than or equal to the voltage at the second input terminal; otherwise, it outputs a high level. When the MCU confirms that the comparator outputs a high level, it controls the push-pull switching circuit to operate; when it confirms that the comparator continuously outputs a low-level pulse signal, it controls the push-pull switching circuit to stop operating. Using this scheme, when a short-circuit fault occurs in a power switching device, all power switching devices can be simultaneously shut down, preventing the short-circuit fault from causing greater damage.

This application relates to the technical field of aerosol generation devices, disclosing a charging interface protection circuit, protection method, and aerosol generation device. The charging interface protection circuit includes a battery cell, a charging interface, a charging management circuit, a switching circuit, and a control circuit. The control circuit is electrically connected to the battery cell, charging interface, charging management circuit, and switching circuit, and is configured to: shut down the charging management circuit; detect a first charging voltage at the positive charging terminal; and, based on the first charging voltage and a first preset voltage threshold, control the charging interface protection circuit to operate in an open-circuit protection mode, executing an open-circuit protection strategy based on the contact resistance between the positive and negative charging terminals; or control the charging interface protection circuit to operate in a micro-short-circuit protection mode, controlling the switching circuit to be turned on or off based on the power adapter's charging protocol, thereby stopping the power adapter from supplying power. Therefore, the embodiments of this application can achieve abnormal detection and protection of the charging interface, improving charging safety.

The embodiment of the application provides a voltage protection circuit and related equipment, and belongs to the technical field of circuit protection. The application adopts a normally open contact relay, and combines the circuit structure design. No matter whether overvoltage is suddenly encountered in circuit operation or the device is powered on in an overvoltage state, the relay contact maintains a disconnected state. The control circuit can command the relay to be closed when the voltage is normal, instead of commanding the relay to be disconnected when the voltage is overvoltage. The possibility of the relay being incorrectly closed in the initial overvoltage stage due to power-on initialization of the control circuit, delay of judgment and the like is fundamentally eliminated, and instant protection of the subsequent circuit is realized.

This invention belongs to the technical field of drawer-type power distribution cabinets, specifically a power distribution cabinet with intelligent circuit protection function, including a cabinet body; a plurality of evenly arranged mounting slots are opened on one side of the cabinet body; a drawer is slidably connected in the mounting slots; a front panel is fixedly connected to the side of the drawer away from the bottom of the mounting slot; an intelligent circuit breaker is fixedly connected inside the drawer, and the switch of the intelligent circuit breaker is connected to the knob on the front panel through a transmission mechanism. The gas in the gas tank is sent into the air guide tube by the air supply component in the gas tank, and then discharged through the air holes on the surface of the air guide tube, and finally blown to the surface of the inlet and outlet plugs, thereby blowing away the impurities adhering to the inlet and outlet plugs, so that the inlet and outlet plugs can be smoothly connected to the socket inside the cabinet, avoiding poor contact between the inlet and outlet plugs and the socket due to impurities, or overheating or even fire due to increased local resistance.

The application discloses a kind of single-phase short-circuit fast detection protection circuit based on spectral characteristics, including AC section and DC section;In AC section, L line is connected in series with Hall current sensor, the output end of Hall current sensor is respectively connected with one end of voltage-dependent resistor and electrical equipment, voltage-dependent resistor is connected with the port III of rectifier element after being connected with electrical equipment in parallel, the port I of rectifier element is connected with N line;In DC section, the collector of the port II of rectifier element is respectively connected with triode NPN, one end of diode D1 and one end of capacitor C1, the emitter of triode NPN is respectively connected with the other end of diode D1, one end of diode D2 and the port IV of rectifier element, the other end of capacitor C1 is connected with the other end of diode D2, the base of triode NPN is connected with CON port through resistance R1.This application samples current by Hall current sensor, judges short-circuit fault using spectral analysis, and cuts off power supply by controlling triode NPN to shut down quickly through CON port, to realize fast short-circuit protection.

The utility model discloses a kind of driver 24V fan short-circuit protection circuit, and the circuit includes: sampling resistance Rm, for sampling voltage value according to fan current;First switch tube Q1, its gate is controlled to photoelectric coupling secondary side output, control fan negative pole interface FAN-COM and +24V ground EP2 conduction, supply fan power supply;NPN and PNP double triode structure, for when fan current is too large or short-circuit, NPN and PNP double triode structure conduction, low level is output to the gate of first switch tube Q1, turn off the passage of fan negative pole interface FAN-COM and +24V ground EP2, realize fan short-circuit protection.The utility model can actively cut off fan loop when driver external fan fails, protect the power supply circuit device of fan from being damaged.

This invention provides a liquid metal alloy composite phase change material and a resettable thermal fuse, relating to the field of circuit protection device technology. The material is composed of a liquid metal alloy, micro-phase change material capsules, and elastomer molecular chains. The capsules exhibit phase change characteristics, expanding at a preset operating temperature and contracting at a reset temperature. This material can be used in thermal fuses, filled with a microfluidic matrix and integrated with electrowetting electrode pairs. When the temperature exceeds the limit, the capsules expand, driving the liquid metal to flow and disconnect the circuit. When the temperature drops below the reset temperature, voltage is applied through the electrowetting electrodes to reduce interfacial tension, driving the liquid metal to flow back and achieve active reset. This invention combines phase change driving with electrowetting control, realizing programmable protection, status self-diagnosis, and remote communication, and has the advantages of high operating accuracy, rapid reset, and long cycle life.

1. Name of the product in this design: Fuse. 2. Purpose of this design: For overload and short-circuit protection of circuits. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D view 1.

This disclosure relates to a charging protection module and a device to be charged. The charging protection module includes a charging protection chip having a first connection pin, a second connection pin, and a charging protection circuit; the first connection pin is electrically connected to a power pin of a charging interface, and the second connection pin is electrically connected to the charging chip; the charging protection circuit is electrically connected to both the first and second connection pins and is provided with multiple protection components having different circuit protection functions. By incorporating a charging protection chip integrating multiple protection components into the charging interface and the charging chip, this disclosure effectively improves various circuit abnormalities during the charging process while reducing the board area and wiring complexity of the circuit design.

The application relates to a low-side driving device with self-protection, a liquid cooling device and a vehicle, wherein the low-side driving device with self-protection comprises a control chip for outputting a control signal; a low-side driving circuit, an input end of which is connected with the control chip, and an output end of which is connected with a load, for outputting a driving signal to the load according to the control signal; a ground short-circuit protection circuit, one end of which is connected with a first power port, and the other end of which is connected with the low-side driving circuit, for limiting the current of a ground short-circuit loop when the driving signal on the load side is grounded; and a power short-circuit protection circuit, which is connected with the low-side driving circuit, for controlling the low-side driving circuit to be disconnected when the driving signal on the load side is connected with the first power port. The application can effectively solve the abnormality of short-circuit power or short-circuit ground wire in the working process, thereby improving the use safety.

The utility model relates to low frequency current transformer technical field, the utility model discloses to solve the problem that the existing technology is that the voltage stabilizing tube, triode, diode are all semiconductor devices, and its parameter is influenced obviously by temperature change, and the limiting voltage of protection circuit can be lower than the design value when temperature is higher, leads to the problem of malfunction, provides a kind of low frequency current transformer open-circuit protection circuit with temperature compensation function. Including the interactor of access to line net, the interactor has first output and second output, and first output and second output are all connected with load;Protection circuit is further connected between first output and second output, and protection circuit includes multiple series connection voltage stabilizing devices, and each voltage stabilizing device is connected with NTC thermistor in parallel, when temperature rises, the resistance of NTC thermistor reduces, and the current of shunt increases, offsets the influence of breakdown voltage drop of voltage stabilizing device.

This utility model relates to a measuring camera with a stacked circuit module structure, including a light source receiver tube, a lens tube housed within a lens tube receiving hole, a lamp holder fixedly mounted at one end of the light source receiver tube with an LED light board mounted on the lamp holder, and a circuit protection frame at the other end of the light source receiver tube. One end of the circuit protection frame is connected to the light source receiver tube, and the other end of the circuit protection frame has a circuit board receiving hole that communicates with the lens tube receiving hole. An interface circuit board, a main control circuit board, and a probe circuit board are housed within the circuit board receiving hole. All three circuit boards are fixedly connected to the circuit protection frame. The circuit protection frame has multiple heat dissipation vents communicating with the circuit board receiving hole. The end of the lens tube furthest from the lamp holder is fixedly connected to the circuit protection frame. A camera rear cover is also mounted on the circuit protection frame, and a fan is mounted at the ventilation opening of the camera rear cover, with the fan fixedly connected to the camera rear cover. This utility model improves the heat dissipation effect of the circuit board.

The application provides a kind of driver protection function test circuit and test method, the test circuit includes: short-circuit protection function test circuit, gate under-voltage protection function test circuit and high-voltage active clamping protection test circuit, wherein, short-circuit protection function test circuit is tested by double-path voltage division between the collector / drain and emitter / source of the driver to be tested, power emitter / source and emitter / source to apply voltage to carry out short-circuit protection function test;Gate under-voltage protection function test circuit is tested by series voltage division to adjust the power supply voltage of the driver to be tested to carry out gate under-voltage protection function test;High-voltage active clamping protection test circuit carries out active clamping protection test by detecting high-voltage DC power output current. By implementing the application, the protection function test of the driver is realized, and the function retest of the driver under the condition of no structural damage before final shipment is solved.

The present application relates to the technical field of 3D printing, and particularly relates to a printing device and forming method of a circuit protection layer of a display device. The printing device of the present application comprises: a main support; the main support has a front end and a rear end along a horizontal direction; at least two barrier wall printing units, which are adapted to print and form barrier walls on the surface of the connection area and / or non-connection area of a flexible circuit board respectively; the printing unit comprises a printing needle; the printing units are arranged at intervals in the direction from the front end to the rear end; a filling glue printing unit is arranged at intervals with the barrier wall printing units in the direction from the front end to the rear end, is located between the rear end and the barrier wall printing units, and is adapted to print filling glue in the space between the multiple barrier walls formed by the multiple printing units to form a circuit protection layer; the circuit protection layer covers at least the connection area. The present application can effectively solve the problems of poor uniformity of the film layer thickness of the circuit protection layer, influence on packaging, and even possible influence on the display effect.

This invention discloses a circuit for suppressing back electromotive force (EMF) in a wire-feeding motor, comprising: a protection filter circuit, a half-bridge circuit, a half-bridge drive circuit, and an overvoltage monitoring and braking circuit. The protection filter circuit is connected to the power bus to prevent backflow of EMF into the power bus and to perform filtering. The half-bridge circuit is connected to the protection filter circuit and an external motor. The half-bridge drive circuit is connected to the half-bridge circuit to drive the half-bridge circuit and drive the motor to rotate. The overvoltage monitoring and braking circuit is connected to the protection filter circuit and the half-bridge drive circuit to monitor the voltage of the power bus. When the voltage of the power bus is too high, it performs rapid discharge and simultaneously drives the motor to stop rotating through the half-bridge drive circuit. This invention fundamentally cuts off the path of backflow of the back EMF generated by the motor or inductive load to the power supply by connecting a power diode D1 in series on the bus and utilizing its unidirectional conductivity.

The application relates to the field of intelligent control of circuit protection devices, and particularly discloses a control method for power line carrier communication of a universal circuit breaker, which is applied to a controller with a built-in high-speed power line carrier communication module and comprises the following steps: when a controller determines a tripping instruction generated by a line fault, the controller synchronously generates a priority communication identifier containing a fault feature; then the HPLC module is driven to broadcast the identifier in an enhanced mode; subsequently, within the inherent delay before the mechanical action of the circuit breaker, the module listens to a public response channel to receive a special communication resource authorization dynamically issued by a power distribution master station according to the identifier; finally, the module transmits complete fault data in an exclusive mode without conflict on the authorized special time slot or frequency band. Through deep coupling of communication scheduling and protection action timing, the application realizes dynamic resource cooperation at the system level and ensures the absolute reliability and ultra-low delay of key information transmission.

The utility model discloses a kind of adaptive control circuit of heating body, including MCU temperature control circuit, temperature control circuit, temperature feedback device, current detection circuit, voltage detection circuit, protection detection circuit and temperature display device.The control circuit can automatically identify the heating core type connected, according to the deviation of set temperature and actual temperature output PWM control signal, drive temperature control circuit to carry out temperature rising or cooling adjustment;Temperature, current, voltage are monitored in real time by a variety of detection circuits, and protection mechanism is started under abnormal state, simultaneously, working state is fed back in real time by display device.The control circuit is strong in adaptability, safe and reliable, and is applicable to a variety of heating application scenarios.

The utility model relates to power protection technical field discloses a kind of constant voltage constant current short-circuit protection device, comprising: power transmission end, reference sampling circuit, first voltage sampling circuit, first current sampling circuit, first optocoupler and comparison control chip.Reference sampling circuit is used to export voltage reference value and current reference value to comparison control chip;First voltage sampling circuit is used to export first voltage sampling value to comparison control chip;First current sampling circuit is used to export first current sampling value to comparison control chip;Comparison control chip is connected with first optocoupler, comparison control chip is used to export short-circuit signal to first optocoupler when determining that first voltage sampling value is lower than the voltage reference value, and first current sampling value is higher than current reference value;The model of comparison control chip is TSM104 chip.Can be combined with the double conditions of voltage and current, the accurate identification to real short-circuit fault is realized.

The application discloses a kind of microwave coagulation equipment idle protection method and system, it is related to microwave coagulation equipment technical field, the method includes: through temperature sensor being arranged on the microwave coagulation equipment microwave ablation needle, temperature rise is generated by real-time absorption microwave energy that is leaked to air due to idle, and corresponding temperature is collected;According to the temperature collected at each time point, the temperature change rate on temperature sensor is continuously calculated according to set time interval;Whether the microwave coagulation equipment is idle state is judged by the temperature change rate.The application improves the timeliness of idle state determination, to improve the timeliness of microwave coagulation equipment idle state protection.

1. Name of the product in this design: Outdoor waterproof box. 2. Purpose of this design: for outdoor network and circuit protection. 3. The key design features of this product are the combination of shape and pattern. 4. The image or photograph that best illustrates the design's key points: a 3D model.

The utility model relates to a protection structure based on a fuse and a filter capacitor. The protection structure comprises a base plate, the fuse, the filter capacitor, a PDU wire harness, a common mode inductor, a copper bar positive electrode, a copper bar negative electrode and a connecting sheet. One end of the PDU wire harness is respectively connected with the connecting sheet and the negative electrode of the copper bar, the other end of the PDU wire harness passes through the common mode inductor (4), and the positive electrode of the copper bar, the negative electrode of the copper bar and the connecting sheet are all arranged on the bottom plate. According to the utility model, the fuse and the filter capacitor are organically combined together, so that the fuse can effectively suppress electromagnetic interference and improve the overall performance of the motor controller while realizing circuit protection, a traditional fuse can only cut off a circuit when current is overloaded, while the product has accurate overcurrent protection capability and can effectively prevent electromagnetic interference when the current is overloaded. And the problem of electromagnetic interference can be effectively solved.

This application provides a battery protection chip, system, short-circuit protection detection comparator, and electronic device, relating to the technical field of power supplies. The battery protection chip includes: a power-on reset circuit, a delay circuit, a short-circuit protection detection comparator, a logic processing module, and a power transistor; the power-on reset circuit generates an enable signal based on the voltage output by the power supply; the delay circuit outputs the enable signal after a preset delay; the short-circuit protection detection comparator receives a preset threshold signal, a VM signal, and the delayed enable signal, and outputs a detection signal indicating whether a short circuit has occurred; the logic processing module receives the detection signal and the delayed enable signal, and generates a control signal based on the detection signal and the enable signal; when the control signal is a first control signal, the power transistor is turned off, keeping the VM signal at a high level; when the control signal is a second control signal, the power transistor is turned on, pulling the VM signal low.

The utility model relates to comparator circuit protection technical field discloses the load short circuit protection circuit based on comparator, include: current sampling resistance RS2, first end connects public end, second end ground connection, comparator U13 the opposite phase input end through resistance R106 and electric capacity C67 shunt network connection RS2's public end, the positive phase input end through resistance R107 connects TL431 reference source U14's cathode, TL431 reference source U14's reference pole passes through resistance R111 ground connection, drive chip EG27324. In the utility model, through comparator U13 the direct triggering of B light coupling U10 action, force MCU to shut off drive chip EG27324, and after receiving hardware fault signal, through software filtering algorithm secondary verification load state, simultaneously, three -level hardware filter and software dynamic threshold value compensation, realize the cooperative protection mechanism of hardware fast response and software accurate fault tolerance.