240results about "Arrangements responsive to excess current" patented technology

The application provides a synchronous trigger fuse control circuit and a synchronous trigger fuse, which comprise an internal trigger module and an external trigger module; the external trigger module is connected to a conductor of the synchronous trigger fuse and is used for receiving an external trigger signal; when the external trigger signal is received or an internal trigger signal on the conductor is collected, a first ignition device is triggered to cut off the conductor to cut off a protected circuit; the internal trigger module is connected to the conductor of the synchronous trigger fuse and is used for triggering a second ignition device to cut off the conductor to cut off the protected circuit when the internal trigger signal on the conductor is collected; or the second ignition device is triggered to cut off the conductor to cut off the protected circuit according to a second current generated after the conductor is cut off. Through the synchronous trigger mechanism, the first ignition device and the second ignition device can be triggered, and the problem that there is still an ignition device with gunpowder left after the fuse ends the protection action is solved.

An apparatus (100) includes a first comparator (120) having first and second inputs, a first control input, an output, and a supply voltage terminal. A second comparator (130) has first and second inputs, a second control input, and an output. The second comparator's first input is coupled to the first input of the first comparator (120). The second comparator's second input is coupled to the first comparator's second input. A switchover logic circuit (140) has an input, a first output, a second output, and a third output. The input of the switchover logic circuit (140) is coupled to the first inputs of the first and second comparators (120, 130). The first output of the switchover logic circuit (140) is coupled to the supply voltage terminal of the first comparator (120). The second output of the switchover logic circuit (140) is coupled to the first control input. The third output of the switchover logic circuit (140) is coupled to the second control input.

This invention discloses a high-voltage capacitor safety discharge device and method, relating to the field of safety discharge technology. The device includes a discharge box, a resistor box, and a control box. The top of the discharge box is equipped with a test electrode for connection to the component to be discharged. Inside the discharge box are at least two robotic arm modules and a voltage divider for monitoring the voltage of the component to be discharged. A conductive electrode is located at the end of each robotic arm module facing the test electrode. The resistor box contains at least two sets of discharge resistors with different resistance values ​​and a temperature sensor. The input terminal of each discharge resistor is connected to a corresponding conductive electrode, and the output terminals of each discharge resistor are connected in series with a current sensor and then grounded. The control box is configured to control at least one robotic arm module to move towards or away from the test electrode based on signals output from the voltage divider, current sensor, and temperature sensor, thereby controlling at least one conductive electrode to contact or disconnect from the test electrode. This invention can improve safety during the discharge process.

The utility model relates to measuring alternating current parameter technical field discloses alternating current parameter tester, include: the signal acquisition module for carrying out the collection to the product parameter signal of measurement, prevent the short circuit protection module of instrument appearance short circuit or reverse connection and influence test process, signal acquisition module includes the voltage division unit, filter unit, AD conversion unit that connect gradually, short circuit protection module includes signal amplification unit, signal isolation unit, on-off control unit that connect gradually. The utility model has the advantages of high collection precision, fast speed, good stability by precision resistance voltage division, then filtering processing, and the analog signal is converted into digital signal and handles, can use in high temperature and normal temperature environment, newly added short circuit protection module that can test the protection of product, no matter what kind of circuit problem appears in the process of testing the product, can realize automatic protection, will not influence the alternating current parameter measurement of test instrument to product.

The application discloses an overload automatic switch strategy making method for a dedicated transformer terminal and relates to the technical field of automatic control of dedicated transformers. The overload automatic switch strategy making method adopts an overload judgment rule containing a judgment branch one and a judgment branch two. The judgment branch one identifies a conventional electrical overload based on an overload current multiple and an equivalent thermal current. The judgment branch two identifies an implicit temperature overload based on real-time temperature. The overload grade from a pre-warning grade to a short-circuit grade is determined in combination with a reverse time limit time, and a corresponding switch control strategy is matched. The method effectively avoids the defects that a single current judgment cannot reflect thermal inertia, distinguish false disturbances and cover implicit overloads. Through multi-dimensional coupling verification and hierarchical disposal, the method not only filters false actions caused by short-time impacts, but also accurately captures thermal accumulation overloads and temperature overloads, thereby guaranteeing power supply continuity while avoiding damage to equipment caused by overloads.

This utility model provides a GNSS antenna status monitoring and protection circuit, including: a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a user radio frequency interface, a switching unit, a first measurement port, a second measurement port, and a controller; wherein, the first end of the first resistor is coupled to a power supply, the second end of the first resistor is coupled to the first end of the second resistor, and the second end of the second resistor is grounded; the first end of the third resistor is coupled to the first end of the fourth resistor, the second end of the third resistor is coupled to the user radio frequency interface, and the second end of the fourth resistor is grounded; the first end of the fifth resistor is coupled to a power supply, and the second end of the fifth resistor is coupled to the switching unit; the first end of the switching unit is coupled to the second end of the fifth resistor, and the second end of the switching unit is coupled to the first port; the first measurement port is coupled to the second end of the first resistor; the second measurement port is coupled to the first end of the third resistor; and the controller is coupled to the switching unit.

A protection system of ship's power distribution system, when a fault occurs in the feeder preset to be in charge of the third circuit breaker module, the relay of the third circuit breaker module trips the circuit breaker based on a magnitude and a direction of a fault current, and to transmit a power distribution maintenance signal to the relay of the second circuit breaker module. When a fault occurs in the switchboard preset to be in charge of the second circuit breaker module, the relays of the second and third circuit breaker modules trip the circuit breaker based on a magnitude and a direction of a fault current and the relay of the second circuit breaker module transmit a power distribution maintenance signal to the relay of the third circuit breaker module preset based on the magnitude and direction of the fault current.

The application discloses a kind of control circuit and method of server standby power supply, including main power drive unit, analog PI regulator, current sampling conditioning circuit and OringFET tube;Main power MOS tube realizes main loop on-off control, and triode is used to change the gate voltage of main power MOS tube to control its conduction, cut-off;Analog PI regulator is composed of reference source and operational amplifier, reference source provides accurate reference voltage, and operational amplifier compares and adjusts current detection signal with reference voltage, dynamically corrects the control level signal of output, and then controls the on-off of main power MOS tube through driving circuit;Current sampling conditioning circuit includes sampling resistance and differential amplifier, and real-time acquisition main loop current is converted into identifiable voltage signal, to provide accurate data support for analog PI regulator.The application is applied when server is in shutdown state, and can be remotely executed by network to start, restart, install operating system or monitor hardware health state and the like operation.

Embodiments provide an Energy Reduction Maintenance Setting (ERMS) key that includes a data connector configured to communicatively couple to a data port of a target device. The ERMS key further includes an illumination device and an actuator mechanism having a base positional state and an actuated positional state. The ERMS key includes logic configured to, upon detecting the actuator mechanism has moved from the base positional state to the actuated positional state, generate and transmit a first data message to the target device through the data connector instructing the target device to enter a protected mode. The logic is further configured to, upon receiving a second data message from the target device over the data connector acknowledging that the target device has successfully entered the protected mode, cause the illumination device to illuminate.

The present disclosure relates to an electronic device. The electronic device comprises a circuit board having a power input end and an electric device, the electric device being electrically connected to the power input end; a power supply component electrically connected to the power input end and configured to supply power to the electric device of the circuit board; a switch component arranged on a connection line between the power supply component and the power input end; and a temperature detection resistor arranged on the circuit board and located on the connection line between the power input end and the electric device; wherein the switch component is configured to disconnect the electrical connection between the power supply component and the power input end when a temperature rise parameter of the temperature detection resistor changes from less than or equal to a preset temperature rise threshold to greater than the preset temperature rise threshold. The present disclosure can cut off the power supply to the circuit board when the temperature rise parameter of the temperature detection resistor is greater than the preset temperature rise threshold, thereby protecting the use of the circuit board and the electronic device.

This application provides a power element protection circuit, including: a current change rate detection module, a boost module, and a drive module. The drive module has a protection terminal and a drive terminal. The current change rate detection module is configured to send a first trigger signal to the boost module when it detects that the rate of change of current flowing through the power element is greater than or equal to a preset threshold for a continuous preset duration. The boost module is configured to increase the voltage at the protection terminal of the drive module to a preset voltage when it receives the first trigger signal. The drive module is configured to output a shutdown signal to the control terminal of the power element through the drive terminal to shut down the power element when the voltage at the protection terminal increases to the preset voltage. Applying the technical solution of this application can solve the problem in related technologies where detecting the voltage of the power element to determine whether a short circuit has occurred leads to the overcurrent protection function of the drive module being easily falsely triggered.

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.

The utility model discloses a passive excitation fuse, including at least one main circuit and at least one branch circuit, at least one main circuit and at least one branch circuit are in parallel, and the cut -off action device is connected in series outside parallel position on at least one main circuit, and the variable resistance is connected in series on at least one main circuit and / or at least one branch circuit, and the tripping device is connected in series on at least one branch circuit. Utilize the characteristic that thermistor is sensitive to temperature, when temperature is abnormally high, capture this feature, make it through the resistance change response to the circuit, realize the commutation. Satisfy short -circuit protection under the low -times short -circuit current limit value fast response, improve the reliability of excitation fuse.

PCB board-mounted surge protection device, including the surge protection components which form surge protection for the protected circuit on the PCB board, the surge protection components are welded on the PCB board, characterized in that: further comprising a tripping device for tripping protection of the surge protection components, the tripping device is welded on the PCB board and is in series with the surge protection components to form a tripping protection circuit, the tripping protection circuit is in parallel with the protected circuit, the tripping device trips off with the overheat, overcurrent or overload of the surge protection components, and the tripping protection circuit is disconnected. The present application realizes reliable and effective front-end protection for the surge protection components on the PCB board, ensures that the surge protection circuit is disconnected in time when the surge protection components are overheated, overcurrent or overloaded, prolongs the service life of the surge protection components, improves the surge protection reliability of the protected circuit on the PCB board, and meets the installation requirements of compactness on the circuit board.

The application discloses a power center direct connection new energy field station system oscillation blocking method under multi-mode oscillation, and the method comprises the following steps: firstly, a power center direct connection new energy field station system model is constructed, and according to the system oscillation center migration law and the system power stability condition, an oscillation blocking mechanism based on the impedance trajectory change rate is given; a negative sequence component error extraction method under multi-mode oscillation and a negative sequence starting element oscillation blocking function failure criterion are proposed; and the selectivity and reliability of the distance protection of the power center system with a high proportion of new energy access under complex oscillation conditions are significantly improved.

Provided are a method and apparatus for predicting a current of a load (550) in an autotransformer (540). A processor is configured to obtain a value of a current of a first input terminal (520) and a value of a current of a first stage of an autotransformer (530), predict whether a plurality of loads are unbalanced, based on the value of the current of the first input terminal (520), the value of the current of the first stage (530), and a characteristic of the autotransformer (540), and determine whether to open a relay (510), based on a result of the prediction and a current flowing through the autotransformer (540), wherein a turn ratio of the autotransformer (540) is 1.

A system includes input voltage terminals; a power converter integrated circuit package coupled without a fuse to the input voltage terminals and having first and second pins, the power converter integrated circuit package configured to detect a short circuit between the first and second pins; and a load circuit coupled to the power converter integrated circuit package.

This invention provides a system for thermal protection in power distribution equipment. [Solution] The power distribution system 100 includes a first silicon-controlled rectifier (SCR) 106A and a second SCR 106B connected to a heat sink. A first temperature sensor 105A senses the temperature of the first SCR, and a second temperature sensor 105B senses the temperature of the second SCR. While the second SCR is disconnected from the load, the control unit compares the temperature from the first temperature sensor with a plurality of temperature thresholds, and in response that the temperature reading from the first temperature sensor exceeds a first threshold but not a second threshold, generates a first warning, and further, in response that the temperature reading from the first temperature sensor exceeds a second threshold, it may disconnect the first SCR from the load and connect the second SCR to the load.

A circuit is described herein which may be used as an electronic fuse. According to one example, the circuit includes an integrated circuit (IC) with a chip contact for connecting, during operation, a filter circuit. The IC further includes a driver configured to drive a power transistor in accordance with a logic signal; a squaring circuit configured to receive a current sense signal that represents a load current passing through the power transistor and to output, at the chip contact, a first current that represents the squared load current; a comparator circuit configured to compare a voltage present at the chip contact with a reference voltage; and a control logic configured to generate the logic signal and to cause a switch-off of the power transistor dependent on an output signal of the comparator circuit.

The utility model provides a college student dormitory power utilization safety overload power -off control device, including control box, its inside is equipped with wiring terminal row, sliding type zero line busbar, power utilization safety overload protector and safety circuit breaker controller, control box side is equipped with cable inlet and outlet wire hole and ventilation grid hole, and low -power consumption components such as LED safety indicating lamp power supply, front side is equipped with the safety box cover of safety lock, this device can real -time monitoring load state, the utility model proposes when overloading through thermal expansion medium phase change drive linkage frame body displacement, cooperate joule heat -sensitive petal's current heating signal, synchronous trigger pressure -sensitive push rod pops out, hysteresis damping claw locking loop, finally through the high -frequency contraction of resonance tripping ring realizes millisecond level power -off. The mechanism has realized overload early warning, quick tripping and remote feedback integrated operation, can accurate and precise avoid impact current false triggering, adapts complex power utilization scene in dormitory, provides reliable guarantee for college dormitory power utilization safety.

Disclosed is an intelligent access control system, comprising: an audio module for outputting a doorbell audio signal, a doorbell control module comprising a doorbell switch and a first power supply, an overcurrent automatic shutdown module, the overcurrent automatic shutdown module being connected in series with the doorbell control module across a second power supply, the audio module being connected in parallel with the overcurrent automatic shutdown module, if the doorbell switch is disabled, the second power supply supplies power to the doorbell control module through a first branch in which the overcurrent automatic shutdown module is located, and the voltage applied to the audio module by the second power supply through the first branch makes the audio module inoperable; if the doorbell switch is enabled, the overcurrent automatic shutdown module samples the current of the first branch, if the sampled current reaches a set current threshold, the first branch is triggered to be shut down, so that the doorbell control module is switched from being powered by the second power supply to being powered by the first power supply, and the voltage applied to the audio module by the second power supply makes the audio module work, thereby realizing reliable switching of the internal and external power supplies when the intelligent doorbell function is used.

The application discloses a kind of high-voltage substation intelligent monitoring and protection method and system based on cloud edge coordination architecture, and relates to power system control technical field, which comprises: S100: data acquisition;S200: preliminary detection of fault;S300: fault type identification;S400: protection decision;S500: cloud coordination;S600: system recovery.Adopt data hierarchical processing mechanism, guarantee the real-time of key protection function, simultaneously utilize cloud computing capacity to realize advanced analysis.Compared with traditional SCADA system, the cost of the application is reduced by more than 60%, deployment is more flexible, scalability is stronger, and supports fault prediction and preventive maintenance, significantly improves the safety and reliability of high-voltage substation.

The utility model relates to a double -axis voltage type angle of inclination sensor with high protection performance, including PCB circuit board, be equipped with on the PCB circuit board: LDO power supply circuit: through power end protection circuit and external input voltage connection, accelerometer circuit: to detect current three -axis acceleration, and send to MCU circuit, MCU circuit: including the MCU chip of accelerometer circuit connection, to realize the filter of acceleration data, temperature compensation and solution processing, and will double -axis angle output voltage data send to operational amplifier voltage amplification circuit, operational amplifier voltage amplification circuit: to double -axis angle output voltage data that MCU circuit sent is amplified, exports through voltage output end protection circuit. Compared with prior art, the utility model has the advantages of possessing reverse connection, short circuit, wrong connection protection capability and input, output overvoltage, overcurrent protection function, conforms to PL=d functional safety authentication and so on.

This application relates to a load power failure protection system, comprising: a circuit (110) having a power receiving port (110) and a plurality of load ports (120, 130, 140); one or more sensors (A) disposed on the circuit for detecting real-time values ​​related to electrical parameters at each load port; a controller (200) associated with the one or more sensors to receive the real-time values ​​measured by each sensor and to generate a cut-off signal when the real-time values ​​meet preset conditions; and one or more switches (C) associated with the controller and switching to a cut-off state in response to the cut-off signal to cut off the power supply to the associated load ports, wherein the associated load port of each switch is one or more of the plurality of load ports, and each load port is the associated load port of at least one of the one or more switches. This application also relates to a power distribution unit including this system.

The present disclosure discloses a rack power distribution unit for leak detection management. The power distribution unit can include a housing, a power input interface configured to couple to an electrical distribution element, and a plurality of power output interfaces configured to couple to a plurality of output cables. The power distribution unit can include a switch mode power supply (SMPS) configured to receive a trip power and transmit the trip power to one or more relays. The power distribution unit can include one or more relays configured to transmit the trip power to a voltage coil of an overcurrent protection device upon receiving a trip signal, wherein the overcurrent protection device is configured to receive a first power from a power source. The power distribution unit can include a leak detection sensor and a controller communicatively coupled to the leak detection sensor and the one or more relays.

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.

This utility model discloses a through-hole Hall current sensor, including a housing, a through-hole fuse, a magnetic ring, a Hall element, a circuit board, pins, contacts, and a socket. The magnetic ring, Hall element, and circuit board are fixed inside the housing. The magnetic ring has an air gap, and the Hall element is located in the air gap. The lower end of the Hall element is connected to the circuit board, and the pins are connected to the circuit board and extend out of the housing. The through-hole fuse passes through the housing and the internal magnetic ring, and both ends of the through-hole fuse are contacts. The socket includes a base plate, a slot, and a pin slot. The contacts are inserted into the slot and are in complete contact with the slot, and the pins are inserted into the pin slot and are in complete contact with the pin slot. In the actual operation and maintenance application of photovoltaic power plants, if a current sensor failure occurs, it can be directly hot-swapped, which greatly improves the operation and maintenance efficiency and reduces the operation and maintenance cost.

The application discloses a direct current source device and a direct current adjusting method, relates to the field of direct current tests, and comprises an isolation transformer, a rectifier bridge, a filter capacitor, a digital potentiometer, a voltage gear switching switch, a first current-limiting resistor, a second current-limiting resistor, a collection module and a control module, the collection module is used for collecting current values and voltage values, the control module is connected with the collection module, the digital potentiometer and the voltage gear switching switch respectively, an input end of the isolation transformer is connected with an alternating current source, and an output end of the isolation transformer is connected with the rectifier bridge; the rectifier bridge is connected in parallel with the filter capacitor, and then connected in series with the digital potentiometer; an output end of the digital potentiometer is connected with a common end of the voltage gear switching switch; a first movable end of the voltage gear switching switch is connected with the first current-limiting resistor, and a second movable end of the voltage gear switching switch is connected with the second current-limiting resistor; the other end of the first current-limiting resistor and the other end of the second current-limiting resistor are both connected with a positive electrode as a second load. The application realizes automatic voltage switching, meets different requirements and improves compatibility.

This invention relates to an integrated quantum random number generator (iQRNG), particularly a photonic QRNG monolithically constructed in a shared semiconductor substrate within the same material system in a scalable and fully integrated manner. It comprises a photon source and a detector for single photons directly coupled to the source, implemented in a particularly compact and attack-resistant manner on a semiconductor-structured technology platform open for a wide range of applications. The subject of this invention is an integrated quantum random number generator iQRNG (200) comprising a photon source (120) and a single-photon detector (130), wherein the photon source (120) and the single-photon detector (130) are arranged vertically overlapping each other in a shared substrate (110) made of semiconductor material. Furthermore, this invention also relates to an integrated electronic circuit (500) comprising at least one iQRNG (200) according to the invention.