317results about "Fuses testing" patented technology

A combination battery, light bulb, fuse tester having novel features. In particular, the tester includes a novel probe apparatus including an actuator, a pair of opposed probe arms, each of the probe arms having an electrical contact on an end thereof, the probe arms being adapted such that operation of the actuator biases the ends of the probe arms away from each other to an open position allowing the electrical poles of a battery, light bulb, or fuse to be tested to be contacted by the contacts on the probe arms. Additional features include magnetic probe contacts to facilitate the testing of a battery, light bulb, or fuse.

A system, method and program product for adjusting an environmental variable of a fuse blow of an electronic fuse are disclosed. A mimic NFET is coupled to a fuse blow source voltage line, a fuse blow gate voltage line, and a chip ground in the same manner as the electronic fuse, except that the mimic NFET is not attached to a poly fuse link. The on current (ion) and off current (ioff) of the mimic NFET are measured to determine a blow current of the electronic fuse. The environmental variable is adjusted based on the determined blow current.

A system and method that compares an input voltage value through the input terminal of the LDC with a setting voltage in an ignition on-state and an on-state of a main relay for connection of a high-voltage battery Then a verification is made whether the main relay is in the on-state and whether the voltage of an input capacitor in an inverter is in a normal voltage range. As a result a diagnosis is made whether the disconnection of the input fuse has occurred in a low-voltage state when the input voltage is no more than the setting voltage and the on-state of the main relay and the state in which the voltage of the input capacitor in the inverter is in the normal voltage range.

The invention discloses a method and a device of testing surge current impact resistant property of a fuse and can be used for testing the surge current impact resistant property and a fusing characteristic. The technical scheme is that the device of testing the surge current impact resistant property of the fuse comprises a tested fuse, a monitoring portion, a current-limiting resistance, an electronic load and a power source. The device of testing the surge current impact resistant property of the fuse is characterized in that the monitoring portion comprises a monitoring oscilloscope and a sampling resistance. The sampling resistance is connected with the tested fuse, the current-limiting resistance, the electronic load and the power source in sequence to form a closed loop. The monitoring oscilloscope is parallel connection with two ends of the sampling resistance. The power source is a storage battery set, wherein the storage battery is connected in parallel. The electronic load is used for producing periodic surge pulses. The monitoring oscilloscope can monitor resistance variation and fusing time of the tested fuse when the sampling resistance produces corresponding current pulses.

The invention discloses a breaking character detector of current limiting fuse, which comprises a main power supply, a current meter, a timer, an auxiliary power supply, a surge current generator, a heat engine buffer circuit, a current gate circuit and a fuse breaking locking signal extracting circuit, wherein the surge current generator is connected with the main power supply, the main power supply is connected with the current meter to be connected with the heat engine buffer circuit, the heat engine buffer circuit is connected with the current gate circuit mounted with a detector for detecting the fuse, the detector via the fuse breaking locking signal extracting circuit is connected with the current meter and the timer, the heat engine buffer circuit is connected with a preset trigger button to be controlled, the current gate circuit is connected with a synchronous trigger button to be controlled, the synchronous trigger button is connected with the timer, the auxiliary power supply is connected with the timer, a hand-operated return switch is connected with the timer and the current meter. The invention has simple operation, which can detect the breaking character of general current limiting fuse and can be added with a plug interface to detect other fuses of different types.

The invention discloses a device for monitoring working or fusing state of a fuse, and relates to field of power transmission and distribution of power systems. The device for monitoring the working state of the fuse is connected in parallel near the fuse on a power transmission line. One end of the monitoring device is connected with a line load end, and the other end of the monitoring device is connected with a line power end. When the monitoring device monitors the information that the fuse in a three-phase power supply fuses and ages to be broken (no contact) or breaks down, comparison is carried out with the voltage in a monitoring module and after making judgment, the monitoring device sends a fault signal to give an alarm. At the same time, an indication output end sends the signal to electric equipment to cut off the power supply of the electric equipment so as to protect the electric equipment. The monitoring device improves the safety protection factor of a circuit and provides great convenience for the power transmission and distribution management of the power system.

A sensing circuit for comparing current flow through a reference resistance with current flow through a resistive device under test (DUT) such as a fuse. The sensing circuit includes a comparator having a first PMOS transistor and a first NMOS transistor connected in series between a first input and a first node and a second PMOS transistor and a second NMOS transistor connected in series between a second input and the first node. The first PMOS and NMOS transistors are cross-coupled with the second PMOS and NMOS transistors. Specifically, a first output is connected to the first node to the gates of the second PMOS and second NMOS transistors and a second output is connected to the second node and to the gates of the first PMOS and first NMOS transistors. The reference resistance is connected to one of the inputs and the DUT is connected to the other input.

A fuse test and ground device includes an insulated housing with a bore that extends from the front of the housing towards the rear of the housing. An electrical contact is disposed partially within the bore. A current interrupter, such as a fuse, is electrically connected between the contact and a testing ground lead. An eye, having it's surface insulated by the housing, can be attached to the housing and provide a connection point for manipulation of the device. A grounding bore extends from a second aperture into the housing and provides an electrical connection to the contact. A grounding plug can be connected to ground on one end and inserted into the grounding bore to create a permanent ground for the device. An annunciator is connected to the current interrupter such that the annunciator provides an indication when a current flows through the current interrupter.

A fuse detection circuit has; a fuse (102) under detection to produce a first voltage in the first arm in response to a read signal; a reference fuse (108) to produce a second voltage in response to the read signal; a sensing circuit (124) to sense the first voltage and the second voltage as status value data of the fuse under detection; a latch circuit (136) to keep the data in the sensing circuit; and a timing control circuit (138) to turn off the fuse bridge circuit independently of the read signal.

Systems and methods are shown for detecting a blown fuse in a three-phase line by comparing neutral points in the line before and after the fuses. Diode rectifier circuits may be used to compare the neutral points and generate a DC output voltage when neutral points are off from one another, and photocoupler circuits may provide electrical isolation when signaling a neutral point shift. The neutral points compared need not be on immediate sides of the fuses, so intermediate components may exist, and in some embodiments one of the compared points may be within a load connected to the three-phase line.

Systems and methods for detecting the mode (a.k.a., state) of a fuse or set of fuses in a device such as an integrated circuit. One embodiment comprises a method for determining three fuse states (uncut, cut, and destroyed) by comparing the fuse voltage with two reference voltages. Each fuse state has a different (indicative) impedance and is associated with a fuse voltage. The fuse voltage is below, between, or above two reference voltages, thereby determining the fuse state. One embodiment includes the fuse in series with a read transistor as well as two reference voltage generators, each comprising a resistor and a transistor (equivalent to the read transistor). Both resistors' impedances are greater than the uncut fuse impedance and one is less than the cut fuse impedance. Two comparators are used to bracket the fuse voltage, indicating that the fuse is uncut, cut, or destroyed.

An arc fault circuit interrupter test circuit is disclosed. The test circuit incorporates a controller along with at least one power transistor, a current sense circuit and a voltage sense circuit. When the power transistor is operated, the current flowing through the transistor is sensed, and if the current is not at least equal to a threshold value, the voltage at which the power transistor is operated is increased.

An eFuse system and a method for testing the eFuse system are provided. The eFuse system includes an eFuse, a sensing circuit, and an offset resistor. The sensing circuit has a trigger point resistance and is coupled to a first end of the eFuse for sensing the resistance of the eFuse, wherein the resistance depends on whether the eFuse is blown or not. Accordingly, the sensing circuit outputs a first signal if the sensed resistance is greater than the trigger point resistance and outputs a second signal if the sensed resistance is less than the trigger point resistance. The offset resistor is coupled to a second end of the eFuse for compensating a shift on the trigger point resistance of the sensing circuit due to temperature change.

The invention provides a method and a device for detecting state of a power unit fuse. Whether the fuse is fused is judged by detecting a direct current bus voltage in a power unit; and because the direct fusing reason of the fuse in the power unit is over current on the fuse and the over current is generated by short-circuit, no matter the output side of the power unit is short-circuited, or a rectifying unit is short-circuited, or the bus is directly short-circuited, quick drop of the direct current bus voltage is caused. Therefore, the method and the device for judging the state of the fuse by detecting the direct current bus voltage are very reliable. A device for detecting the direct current bus voltage is arranged in the common power unit, so the method has no requirement for the fuse, does not need to detect the voltages at two ends of the fuse, is simple and reliable, has low cost, and is suitable for occasions of medium voltage and high voltage.

A back end of the line (BEOL) fuse structure having a stack of vias. The stacking of vias leads to high aspect ratios making liner and seed coverage inside the vias poorer. The weakness of the liner and seed layers leads to a higher probability of electromigration (EM) failure. The fuse structure addresses failures due to poor liner and seed coverage. Design features permit determining where failures occur, determining the extent of the damaged region after fuse programming and preventing further propagation of the damaged dielectric region.

A blown fuse proximity sensing device 40 is for use with a rectifying wheel 37 of a type including rectifying diodes 38 and associated fuses 42. Each fuse 42 may include a housing 51, a fuse element 52 carried by the housing, and a pop-out indicator 54 movable between a normal position and a popped-out position. In the popped-out position, the indicator 54 extends outwardly from the housing responsive to failure of the fuse element. At least one stationary proximity sensor 44 is mounted adjacent the rectifying wheel 37 for sensing positions of the pop-out indicators 54 without contact therewith during rotation of the rectifying wheel to thereby sense at least one blown fuse. The sensing device 40 may also include a local display 61, and a controller 68 connected to the stationary proximity sensor 44 for generating an indication of a blown fuse on the local display. The controller 68 may also generate at least one remote output, such as to be monitored by other plant control equipment.

The invention relates to the technical field of storage battery, and more specifically, relates to a main fuse fusing and open-circuit detection method and apparatus for a storage battery pack. The main fuse fusing and open-circuit detection method and apparatus for a storage battery pack can monitor the storage battery state in a transformer station, and can quickly detect and determine the result and generate an alarm signal when the storage battery is separated from a bus, thus being convenient for maintenance for the staff, and guaranteeing safety of the standby power supply of the transformer station.

[Problem to be Solved] To prevent false determination of a fuse blowout with a fuse not blown by certainly detecting the fuse blowout.[Solution] A power supply apparatus includes: a drive battery (1) having a plurality of battery units (2) connected in series; a fuse (19) connected in series with the drive battery (1); a voltage detection circuit (3) detecting a voltage of the battery unit (2) by dividing the voltage at a resistance voltage dividing circuit (11) with a line connected to one end of the fuse (19) as a ground line; and a blowout detection circuit (4) detecting a blowout of the fuse (19) based on the voltage detected at the voltage detection circuit (3). The blowout detection circuit (4) determines that the fuse is blown when a detected voltage of the battery unit (2) connected to a fuse (19) side with respect to the ground line falls within an abnormal range. Further, in the power supply apparatus, the blowout detection circuit (4) determines that the fuse is blown when detected voltages of a plurality of battery units (2) fall within the abnormal range.

The invention relates to a combiner box system, and particularly discloses a system and a method for detecting the fuse state a combiner box. The system comprises an anti-reverse diode, fuses, a photovoltaic battery input current sampling circuit, a photovoltaic battery input voltage sampling circuit, a bus rod voltage sampling circuit, a first detection circuit, a second detection circuit, a third detection circuit and a processing unit, and the system can monitor that the fuses of the combiner box are in the normal state or in the burned failure state. The invention provides the system for detecting the fuse of the combiner box, which is modularized, easy to expand and has real-time online monitoring function, and the invention provides the method for diagnosing the failure of the fuse of the combiner box in real time for a photovoltaic power generation system.

A blown fuse proximity sensing device 40 is for use with a rectifying wheel 37 of a type including rectifying diodes 38 and associated fuses 42. Each fuse 42 may include a housing 51, a fuse element 52 carried by the housing, and a pop-out indicator 54 movable between a normal position and a popped-out position. In the popped-out position, the indicator 54 extends outwardly from the housing responsive to failure of the fuse element. At least one stationary proximity sensor 44 is mounted adjacent the rectifying wheel 37 for sensing positions of the pop-out indicators 54 without contact therewith during rotation of the rectifying wheel to thereby sense at least one blown fuse. The sensing device 40 may also include a local display 61, and a controller 68 connected to the stationary proximity sensor 44 for generating an indication of a blown fuse on the local display. The controller 68 may also generate at least one remote output, such as to be monitored by other plant control equipment.

The invention discloses an online monitoring device and method for a drop-out fuse based on IOT (Internet of Things) communication, and the method mainly comprises the following steps: judging that the drop-out fuse drops out when the horizontal angle of a fuse tube of the drop-out fuse is less than a threshold value; and determining that the drop-out fuse is closed when the horizontal angle of the fuse tube of the drop-out fuse is greater than the threshold value. The method can achieve the monitoring of the operation state of the fuse in real time, and the state information of the monitored fuse is transmitted to a background monitoring system. When the fuse is cut off during a short-circuit fault, the method can help a maintainer timely obtain the operation state of the fuse, so as to quickly find out the fault point and quickly restore the normal power supply.

The invention relates to an online monitoring system of a power distribution line fuse. The online monitoring system comprises a terminal device and a master station, wherein the master station comprises a server, and the terminal device communicates with the master station; and the server comprises a configuration management module, an alarm management module, a log management module, a system management module, a test management module, a system analysis module, a database management module and a network server module. The system provided by the invention helps the operation and maintenancepersonnel to find a fault point in time by monitoring and uploading information and data, such as the fault information of the fuse, the position of a fuse tube, fault current before the fuse, so as to quickly repair the fault and recover the power supply, and meanwhile, the fuse current collected by the system is used as the reference for the state maintenance of a fuse device.

The invention relates to a fuse state monitoring protection device and a fuse state monitoring protection method, which are used for improving the protection and trouble shooting of a capacitor group in a high voltage reactive power compensation device and solve the problems that a conventional fuse does not have a state monitoring function and that specific failing points are difficult to find after the fuse fails. The fuse state monitoring protection device comprises the fuse connected with capacitors and a controller connected with the fuse, wherein the two ends of the fuse are connected with a voltage sensor respectively; the voltage sensors are connected with the controller; and each capacitor is connected with an alarm which is connected with the controller. Voltage at the two ends of the fuse is monitored, the controller performs comparison and judgment to determine the working state of the fuse, simultaneously the abnormally working fuse is accurately positioned, corresponding capacitors are protected, failing positions are convenient to investigated, response is made timely, convenience is brought to the maintenance of maintainers, and shutdown time is shortened.

The application discloses a transformer winding and fuse fault evaluation method, device and equipment. A changing curve of a single-phase grounding recovery voltage of a small current grounding system with time is calculated; integrating processing is carried out on the recovery voltage to obtain a changing rule of the iron core flux with time; the saturation situation of the transformer is estimated; whether an over-current risk caused by saturation exists is determined; an excitation current and fuse energy at an initial stage are calculated; whether the fuse has a fusing risk is determined; all excitation currents and energy accumulation before the neutral point displacement recovery are calculated; and whether the primary winding has an overheating risk is determined. Therefore, technical problems that the winding burning and fuse fusing causes can not be determined qualitatively when the existing electromagnetic voltage transformer is observed in a split manner for the fault factor determination and thus the inspection and maintenance and running strategy making is affected and the faults occur frequently are solved.