264results about "Overload protection arrangements" patented technology

The invention discloses a method for preventing needle burning during testing of breakdown voltage of a discrete device. According to the method, in a test loop comprising a probe card and a test source, a voltage-withstanding module is connected in series between the probe card and a low-potential end of the test source. The voltage-withstanding module comprises a detection resistor Rx and a voltage-withstanding switching device connected with the detection resistor Rx in parallel. When the test current I is applied, if the current is increased abnormally due to poor contact and the like, and the voltage drop on the detection resistor Rx is greater than or equal to the starting voltage VT of the voltage-withstanding switching device, the voltage-withstanding switching device is switched on, the test current I is shunted, and the current flowing through the probe card is reduced, so that the probe is prevented from being burnt. The breakdown voltage of the tested device is calculated by measuring the total voltage V at the two ends of the test source and subtracting the voltage drop (I * Rx) on the detection resistor Rx, and the test accuracy is ensured. The method can effectively protect the probe card and improve the test reliability and efficiency.

The invention belongs to the technical field of electronic measuring instruments, and particularly relates to an output protection method of a source meter, which comprises the following steps of: configuring an operation mode of a digital controller; executing closed-loop control of the main regulator; the arbiter continuously monitors the output state, and intelligently arbitrates and switches the main regulator, the clamping regulator and the output channel according to the measurement feedback value, the clamping threshold value and the over-limit threshold value, thereby achieving the precise clamping and over-limit protection of the output. By adopting the technical scheme, the flexibility, refined protection and adaptability of source table output control can be remarkably improved, the hardware cost is reduced, and the system reliability is improved.

A DC electronic load circuit relates to the technical field of electronic load control. The utility model provides a direct current electronic load circuit which integrates a dissipation MOS tube array, an analog PID loop, a digital integrated control module, a bus electrical parameter sampling and processing module and a WiFi communication module, and realizes a plurality of working modes such as constant current, constant voltage, constant resistance and constant power by accurately controlling the conduction degree of the MOS tube array. The system has the advantages of real-time monitoring, remote control, overvoltage and overcurrent protection, low power consumption design and the like, and an electronic load solution which is high in precision, high in stability and flexible to operate is provided, so that diversified test requirements are met, and the power supply test efficiency and safety are improved.

The invention discloses a high-precision voltage regulating system of a power frequency no-partial-discharge test transformer, and the system comprises a heterogeneous multi-stage power module which is formed by connecting an H-bridge unit group and a matrix converter in parallel, the H-bridge unit group outputs a fundamental voltage component, and the matrix converter compensates a high-frequency harmonic component; the multi-physics field digital twinning unit integrates an electromagnetic field solver, a thermodynamic model and a mechanical deformation simulation module and predicts the multi-physics field coupling state of the insulation system in real time; the dynamic impedance matching network comprises an adjustable inductor array and a digital capacitor bank, and automatically adjusts filtering parameters according to a load impedance measurement value; and the control module is used for deploying a deep learning model and is used for optimizing a modulation strategy and a protection threshold on line. According to the method, the voltage regulation precision and the waveform purity can be improved, the stability under the wide-range working condition is guaranteed, the breakdown hidden danger is recognized in advance through multi-physics field coupling simulation, and partial discharge development is restrained from the source.

The invention relates to the technical field of control systems, and particularly discloses an intelligent control system for an insulation test of a marine dry-type transformer. The system comprises a high-voltage test power supply module, a multi-mode sensing acquisition module, an insulation state evaluation module, a self-adaptive boost decision module and a test process control module, and evaluates an insulation state and dynamically decides a boost rate and a holding strategy by acquiring voltage, leakage current, partial discharge and temperature data in real time. Intelligent control and safety protection in the insulation test process are achieved, potential insulation damage is effectively avoided, and diagnosis precision is improved.

The invention relates to a high-voltage transformer series resonance withstand voltage test system and an automatic tuning method, and relates to the technical field of high-voltage electrical equipment testing, and the system comprises a control module, a signal generator, a resonance circuit, a data acquisition module and a safety protection unit. The method comprises the following steps: initializing system parameters; automatically searching and locking an optimal resonant frequency point; executing a withstand voltage test at the resonance point and monitoring data; and automatically analyzing data and judging performance. According to the invention, through full-closed-loop automatic control, rapid and accurate locking of the resonant frequency and intellectualization of the test process are realized, and the problems of low efficiency, poor precision and insufficient safety of a traditional method are effectively solved. The device has the outstanding advantages of high adaptive capacity, reliable test result and safety and convenience in operation, and is particularly suitable for high-efficiency and accurate standardized test on the insulating properties of various high-voltage transformers in an electric power system.

The invention discloses a composite voltage generation device and a cable insulation performance evaluation system and method, and relates to the technical field of high-voltage insulation testing. The composite voltage generating device comprises a synchronous controller, a direct current source, an impact source, an IGBT active protection unit and a magnetic isolation coupler, and by means of the excellent characteristics of the IGBT and the magnetic isolation coupler, the superposition time sequence accuracy of direct current and impact voltage is improved, and waveform distortion is reduced. The IGBT active protection unit comprises a first IGBT and a second IGBT, and direct-current voltage polarity switching can be realized through selective conduction of the IGBTs; the RC circuit is connected in parallel between the collector electrode of the first IGBT and the emitter electrode of the second IGBT, reverse current flowing back to the direct current source direction can be discharged through the RC circuit, the risk of energy flowing back is reduced, meanwhile, the magnetic isolation coupler can completely block direct current, and an impact source is protected against the influence of direct current voltage; according to the invention, the authenticity and reliability of cable insulation performance evaluation can be effectively improved.

The invention relates to a power device driving fault detection circuit and a use method thereof. The power device driving fault detection circuit comprises a control circuit, an inverter circuit, a first comparator, a second comparator and a detection circuit, the control circuit outputs a complementary signal to drive a power device in the inverter circuit, and the inverter circuit supplies power to post-stage equipment and provides a voltage signal for the comparator; the first comparator detects grid and source voltage of the upper bridge power device, the second comparator detects grid and source voltage of the lower bridge power device, and results are input into the detection circuit. The detection circuit uses a logic gate to determine whether the upper and lower bridge arm power devices are simultaneously conducted or not so as to realize dead zone detection. According to the system, hardware circuits and excessive controller pins do not need to be added, the detection process is safe, and large current cannot be generated.

The invention discloses a high-precision voltage and current characteristic quantity extraction and anti-interference sampling circuit compensation method, and belongs to the technical field of voltage and current sampling, and the method comprises the steps: employing a 24-bit ADC to collect voltage and current signals at the sampling frequency of 1 kHz to 10 kHz; electromagnetic interference is inhibited through the metal shielding cover and the wave absorbing material; dynamically correcting the sampling data through a temperature compensation model; dynamically correcting the sampling data based on an LMS algorithm; voltage and current effective values are calculated through a root mean square algorithm in a sliding window mode, a processing result is output in real time, and the problems that existing sampling precision is low and the error compensation effect is limited are solved.

The invention relates to the technical field of power system energy storage equipment testing, in particular to a small and medium-sized industrial and commercial energy storage cabinet twin-trawling testing system which comprises a main loop, a secondary control loop and an anti-countercurrent detection unit, the main loop comprises double testing loops and four sets of alternating current contactors, and multi-machine twin-trawling testing frameworks such as one-to-one, one-trawling-two and one-trawling-three can be flexibly combined; independent switching between grid connection and grid disconnection is supported, the secondary control loop comprises a button with a lamp and a grouping reset button, and the countercurrent prevention detection unit detects the energy flow direction in real time through an intelligent electric meter and a current sensor and has a mains supply charging function. According to the test system, through a double-loop parallel test architecture and a multi-machine flexible combination design, the system can be synchronously butted with multiple energy storage cabinets to carry out parallel test, the test efficiency can be improved, and a safety system with anti-countercurrent detection, rapid mode switching and precise control protection guarantees the test safety; the arrangement of the standardized terminal and the button with the lamp simplifies the operation difficulty, and reduces the test threshold.

The utility model provides an over-current protection circuit of skin detector, including over-current detection element, switch module, current amplifier and singlechip, over-current detection element and switch module series connection in skin detector's main circuit, current amplifier's input terminal connects over-current detection element and switch module's contact, the output terminal connects singlechip, current amplifier's current amplifier is connected with the singlechip, current amplifier's current amplifier's current amplifier's current amplifier's current amplifier's current amplifier's current amplifier's current amplifier's current amplifier's current amplifier's current amplifier's current amplifier's current amplifier's current amplifier's current amplifier. The level output end of the single-chip microcomputer is connected with the controlled end of the switch module. When the skin detector is used, the switch module is conducted to enable the main circuit of the skin detector to start to work, the current amplifier amplifies a current signal flowing through the current detection element at the moment and then inputs the current signal into the single chip microcomputer, and if the amplified current is larger than a preset protection value, it means that the working current of the skin detector is too large; therefore, the single-chip microcomputer outputs high level to the switch module through the level output end of the single-chip microcomputer, so that the switch module is switched off, a main circuit of the skin detector is switched off, and the skin detector is prevented from working in an overcurrent state.

The invention discloses a high-voltage diverter and a sampling device, and belongs to the technical field of diverters, the high-voltage diverter comprises a main body mechanism, and the main body mechanism is internally provided with a disconnection mechanism used for automatic disconnection when a fault occurs and two terminal mechanisms used for wiring; through the linkage design of the built-in temperature sensing piece and the disconnecting mechanism, automatic and accurate fault protection is achieved, when the internal temperature of equipment abnormally rises due to faults and exceeds a safety threshold value, the temperature sensing piece is heated to deform and triggers the disconnecting mechanism, energy stored by the extension spring is used for rapidly driving the on-off connecting piece to act, a main circuit is reliably disconnected, and the safety of the equipment is improved. Meanwhile, the action can be linked with the top protruding block to be self-locked and protrude out of the surface of the protection shell, an intuitive and striking mechanical fault indicator is formed, accident expansion is effectively prevented, definite fault point positioning can be provided for operation and maintenance personnel, the troubleshooting time is shortened, and the safety and maintainability of the system are improved.

The application provides a trigger monitoring device and energy taking method for a thyristor stage circuit in a direct current energy release device, and the trigger monitoring device comprises a fast energy taking circuit 1, a large-capacity energy taking circuit 2, an overvoltage protection circuit 7 and a post-stage function circuit 8; the fast energy taking circuit 1 is used for taking energy during the charging process of the thyristor stage circuit, supplying energy to the overvoltage protection circuit 7, taking energy from an alternating current harmonic when the charging of the thyristor stage circuit is completed and the alternating current harmonic exists between the two ends of the thyristor 9, and supplying energy to the large-capacity energy taking circuit 2 through a one-way current circuit 13; the large-capacity energy taking circuit 2 is used for taking energy from the two ends of the thyristor 9 in a direct current voltage energy taking mode and supplying energy to the post-stage function circuit 8; the fast energy taking and the large-capacity energy taking are combined, the fast energy taking makes the overvoltage protection circuit 7 enter the working state as soon as possible, and the large-capacity energy taking ensures the normal working of the trigger monitoring device.

The utility model relates to the technical field of measuring equipment, and provides current measuring equipment, which comprises a power supply, a capacitor, a short-circuit wire, a short-circuit switch, a measuring circuit and a measuring switch, the power supply is connected with the capacitor, the measuring circuit is connected with the measuring switch, and the short-circuit wire is connected with the short-circuit switch. And the measuring switch and the short-circuit switch are respectively used for connecting the measuring circuit and the short-circuit wire between the power supply and the capacitor. When the capacitor leakage current measuring device is used, the short-circuit switch is closed to connect the short-circuit wire between the power supply and the capacitor when the capacitor to be measured is charged, or the measuring switch is closed to connect the measuring circuit between the power supply and the capacitor when the leakage current of the capacitor is measured. Physical isolation among the measuring circuit, the power supply and the capacitor in the current measuring equipment is realized, so that when the measured capacitor is uncontrollable, the measuring circuit is disconnected, and the measuring circuit, the power supply and the capacitor are protected from being damaged.

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 invention relates to the technical field of battery capacity testing, and discloses a lead-acid battery capacity testing system, which comprises a hardware platform and a software module, and is characterized in that the hardware platform comprises a single chip microcomputer, an ADC detection circuit, a nixie tube display module, a discharge control circuit, a key input module, a cooling fan and a current expansion interface; the software module runs on the single chip microcomputer, is based on an embedded operating system, and is configured to acquire a voltage signal and a current signal of the lead-acid battery in real time through the ADC detection circuit; and calculating the battery capacity by adopting a current integration method based on the current signal, and judging a discharge cut-off point based on the voltage signal. Through deep cooperation of a hardware platform and a software module, accurate and automatic testing of the capacity of the lead-acid battery is achieved, a current integration method is adopted as a core calculation principle, discharging cut-off judgment is carried out in combination with a voltage signal, and the accuracy and reliability of a capacity testing result are ensured.

The embodiment of the utility model provides circuit board detection equipment. The circuit board detection equipment comprises a plurality of detection units, a voltage stabilizing module, a current display module and two detection contacts are arranged in each detection unit; the two detection contacts are used for being coupled with a detected circuit board, the positive electrode output end and the negative electrode output end of the voltage stabilizing module are respectively coupled with the two detection contacts and are used for supplying power to the detected circuit board, a detection loop is formed by the voltage stabilizing module and the detected circuit board, and the current display module is connected in the detection loop in series and is used for detecting and displaying power supply current of the detected circuit board. And more stable power supply voltage is provided for the detected circuit board through the voltage stabilizing module, so that the condition that the detected circuit board is damaged due to factors such as instantaneous high voltage or large-amplitude voltage fluctuation is avoided, and the detection accuracy is improved. In addition, a plurality of detection units correspond to a plurality of detection channels, so that a plurality of detected circuit boards can be detected at the same time, and the detection efficiency is improved; and voltage stabilizing modules with the same or different output voltages can be configured for the detection units according to detection requirements.

The present invention relates to a circuit breaker auxiliary device, specifically a circuit breaker production detection device. The present invention is achieved by setting the shell on the ground. The on-off detection device is set on the shell and connected to the shell. The dust removal device is set on the shell, the dust removal device is connected to the shell, and is driven by the on-off detection device. The test protection device is set on the shell, connected to the shell, and is driven by the on-off detection device. The controller is set on the side of the shell and on the ground, and the controller is electrically connected to the on-off detection device and the dust removal device. It is achieved that before the circuit breaker is tested, the device can clean the circuit breaker, and when cleaning, the device can automatically disconnect the test circuit to avoid the circuit being turned on during cleaning due to accidental touch by the user. At the same time, before testing the circuit breaker, the device can also automatically replenish insulating gas to avoid the circuit breaker generating arcs during functional testing, thereby achieving the technical effect of damaging the device.

The invention provides an emergency evacuation method for an electromagnetic compatibility test of a power battery, and the method comprises an environment monitoring module, a water tank emergency protection module, a box moving robot system module, a test wire harness cut-off module, a test room control module, a control box module, and an electromagnetic compatibility test equipment protection module. And all the modules realize safety protection in an emergency scene through signal interaction and action linkage. Through cooperation of multiple modules, the single-dimension limitation of traditional protection is broken through, personnel-equipment-environment triple guarantee is constructed, a full-chain safety closed loop is formed, a full-automatic emergency evacuation process is achieved, manual intervention is not needed from emergency situation detection to transfer of a power battery to a safety area, and the evacuation efficiency and safety are improved.

The utility model relates to the field of electric power detection, and discloses a handheld multifunctional live detection device which comprises a handheld detector, a display screen is arranged at the top of the front side of the handheld detector, a button is arranged at the bottom of the front side of the handheld detector, and sliding grooves are formed in the two sides of the handheld detector; and the triggering mechanism comprises a sliding block, the surface of the sliding block is slidably connected to the inner wall of the sliding groove, a holding plate is arranged on one side of the sliding block, spring pieces are arranged on the two sides of the holding plate, and a connecting plate is arranged on one side of each spring piece. According to the utility model, the hand of a user can bend to form a holding action after an electric shock, at the moment, the hand of the user extrudes the spring piece after holding so as to release the fixation between the holding plate and the handheld detector, then the holding plate is pushed through the reset spring, and the handheld detector is popped out of the holding plate through interaction force, so that the handheld detector can be conveniently detected. Therefore, the hand of the user is disconnected from the handheld detector, and power-off protection is carried out on the user.

The utility model provides a current sampling integrated chip, an overcurrent protection circuit, a constant current control loop circuit and an electronic device, a packaging structure comprises N bonding wires, a sampling pin and a grounding pin, a first end of each bonding wire is coupled to the sampling pin, and a second end of each bonding wire is coupled to the grounding pin; the chip structure is arranged in the packaging structure, and the chip structure comprises a current sampling module which is used for obtaining the voltage difference between the sampling pin and the grounding pin when the sampling pin has a current signal, so as to obtain the information of the current flowing through the N bonding wires. Therefore, the impedance generated by the bonding wire connected between the two pins is used as the sampling resistance, the cost is lower, the resistance is smaller, the cost of current sampling in an integrated circuit is reduced, and the efficiency of the circuit is improved.

The invention discloses a sampling overcurrent protection system and method. The system comprises a sampling module, a BMS, a switching element, a PPTC assembly and a voltage dividing module. A battery cell in the battery module is connected with the sampling module through the switch piece, the PPTC assembly and the voltage division module, the sampling module is in communication connection with the BMS, and the sampling module is configured to collect a first voltage signal of the battery cell and send the first voltage signal to the BMS; the first end of the voltage dividing module is connected with the sampling module, the second end of the voltage dividing module is also connected with the sampling module, the sampling module is configured to collect a second voltage signal of the voltage dividing module and send the second voltage signal to the BMS, the switch piece is in communication connection with the BMS, and the BMS is configured to cut off connection between the battery cell and the sampling module through the switch piece according to the second voltage signal. When the electrical core is short-circuited, the resistance value of the PPTC assembly is increased instantly, so that the current is limited, overcurrent protection is realized, the electrical core is not short-circuited any more, the resistance value of the PPTC assembly returns to normal, and the sampling loop works normally.

A control and protection method for a parallel power electronic equipment testing system is disclosed. This method provides fault early warning and protection for the parallel power electronic equipment testing system based on the load characteristics of the equipment under test and the allowable power of the parallel power electronic testing device. This control and protection method is applicable to parallel power electronic power testing systems, enabling the system to reduce the impact of faults on the testing device and equipment under test caused by abnormalities in some modules of the testing system through fault early warning and control protection, thereby minimizing the loss of testing system efficiency and equipment lifespan.

The application belongs to the technical field of accurate checking of power distribution lines, and particularly relates to a characteristic current sending circuit based on a primary and secondary fusion equipment graph model checking system, comprising an isolation DC-DC power supply circuit, a characteristic current signal sending circuit and a PT overvoltage protection circuit. The application is suitable for high-precision automatic topology and checking of power distribution lines. The circuit has the functions of inhibiting PT overvoltage pulses and adjusting the frequency of characteristic current sending, ensures accurate and reliable sending of characteristic current signals, and improves the accuracy and reliability of topology identification.

The invention discloses a self-healing parallel capacitor aging test device and method for an AC power system. The method comprises the following steps: S1, preparation before test; s2, carrying out a first-stage aging test; s3, carrying out a charge-discharge cycle test; s4, performing a second-stage aging test; and S5, detecting after the test. According to the self-healing parallel capacitor aging test device and method for the alternating-current power system, automatic control over the whole test process is achieved, it is guaranteed that test conditions meet the national standard requirement, the influence and closing impact on a power grid in the test process are eliminated, the accuracy and reliability of a test result are improved, and the test efficiency is improved. A standardized method is provided for performance evaluation of the capacitor, and the problems that an existing test device is low in integration and automation degree, poor in test precision, large in power grid influence and insufficient in safety protection are solved.

The invention relates to the technical field of capacitor detection, in particular to a capacitor aging detection and energy recovery system which mainly comprises a control module, an implosion detection module and an energy recovery module, a transformer of the implosion detection module is coupled in a to-be-detected charging loop, the charging loop at least comprises one aging capacitor, and the energy recovery module is connected with the control module. When the transformer detects the abrupt change magnetic field, an abrupt change signal is generated. According to the invention, the electromagnetic induction principle is utilized, the change of current can be detected in an extremely short time, rapid detection of abrupt change current during implosion is realized, and the system uses the controllable discharge and energy recovery unit, so that the energy of the capacitor is recovered to the power supply system or the energy storage system, energy regeneration is realized, the energy efficiency is improved, and the energy consumption is reduced. And the energy-saving and environment-friendly effects are achieved.

This invention discloses an automatic leakage current reliability detection circuit and method for IGBT devices. The circuit includes: a PWM control unit; and an interlock detection unit composed of an HTGB test circuit and an HTRB test circuit. The PWM control unit is connected to the interlock detection unit and is used to control the HTGB and HTRB test circuits in the interlock detection unit to automatically perform interlock tests. The interlock detection unit is used to perform HTGB and HTRB interlock tests on the IGBT device to obtain the gate-emitter leakage current or collector-emitter leakage current of the IGBT device. The automatic leakage current reliability detection circuit and method for IGBT devices provided by this invention not only achieves automatic detection of HTGB and HTRB tests, but also protects the device under test when the leakage current is too high, reduces equipment redundancy, simplifies the testing process, and lowers costs.

The embodiment of the invention belongs to the technical field of circuits, and provides a fault detection circuit and a fault detection device of a circuit board, the fault detection circuit comprises a first power supply and a switch control circuit, the first power supply is connected with a second power supply of a to-be-detected circuit board through the switch control circuit, and the first power supply is configured to supply power to the fault detection circuit. The switch control circuit is configured to cut off an access between the first power supply and the second power supply when the circuit board to be detected is short-circuited, so that the fault detection circuit is protected, and the risk that the fault detection circuit is damaged is reduced.

The invention discloses an integrated power supply device and method for multiple test items of a circuit breaker, and relates to the technical field of circuit breaker testing. Aiming at the problems that two sets of independent power supplies are needed and the operation is tedious in the existing test, the device comprises a rectification module, a power conversion module, a double-winding transformer, two paths of rectification filtering modules, a feedback control module and a switching device. 220V commercial power is converted into direct current through the rectification module, the power conversion module outputs adjustable square wave voltage, after transformation ratio conversion of the double-winding transformer, the two paths of rectification filtering modules output 10-100A adjustable direct current and 40-260V adjustable direct current voltage respectively, and the feedback control module stabilizes the output within the error of + / -2% of a target value. The switching device controls two paths to be independently connected and disconnected through interlocking, and the over-current protection module is triggered to stop when the current exceeds 110 A / 11A. According to the invention, a single device satisfies two test power supply, the size and weight are reduced, the cost is saved, wiring operation and safety risks are reduced, and the test efficiency is improved.