378results about "Overload protection arrangements" patented technology

The invention discloses a power adapter parameter dynamic optimization method for prolonging the service life of equipment, and relates to the technical field of adapter performance optimization, and the method comprises the steps: monitoring and recording the output voltage, current and power factor parameter changes of a power adapter in real time under static and dynamic load conditions by using a test instrument; identifying the trend and reason of abnormal parameter change; performing thermal design optimization and temperature management on the power adapter; performing over-power and over-current limitation on the pulses one by one; introducing a power factor correction circuit; optimizing the switching frequency and the design of an output filter; a load line adjusting circuit is introduced, and space is reserved for dynamic ripples when output current jumps; and evaluating whether the optimization effect reaches an expected target or not. By introducing the power factor correction circuit and the load line adjustment circuit, the power factor of the power adapter is improved, the harmonic pollution is reduced, the stability of the output voltage of the power adapter is improved, and the performance of the power adapter under the dynamic load condition is improved.

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.

The invention discloses a vehicle fault diagnosis circuit, a diagnosis method and a vehicle. The vehicle fault diagnosis circuit comprises an auxiliary diagnosis power supply circuit, a high-side sampling circuit, a low-side sampling circuit, a coil loop current detection circuit, a coil, a high-side switch and a low-side switch. The auxiliary diagnosis power supply circuit is connected with the coil loop current detection circuit, and the auxiliary diagnosis power supply circuit is used for controlling the on-off of an auxiliary diagnosis power supply; the coil loop current detection circuit is connected with the first end of the coil, the first end of the coil is connected with the high-side switch, and the coil loop current detection circuit is used for detecting the current of a coil loop; the high-side sampling circuit is connected with the first end of the coil, and the high-side sampling circuit is used for collecting the high-side voltage of the coil; the low-side sampling circuit is connected with the second end of the coil, the second end of the coil is connected with the low-side switch, and the low-side sampling circuit is used for collecting the low-side voltage of the coil.

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.

A test and measurement device includes an input port to receive an input signal, a sampling circuit structured to generate a sample from the input signal, in which generating the sample from the input signal produces an amount of kickout energy, and an energy reducing circuit coupled between the sampling circuit and one or more other components of the test and measurement device, the energy reducing circuit structured to decrease the amount of kickout energy from the sampling circuit. The energy reducing circuit may include or be combined with a pick-off circuit. Methods are also described.

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 relates to the technical field of power testing, in particular to multifunctional comprehensive test conversion integrated equipment which comprises a conversion integrated device and test instrument connecting line, a conversion integrated device and a multifunctional comprehensive test line. The conversion integration device and test instrument connecting line is used for connecting the conversion integration device and a test instrument; the conversion integrated device is used for quickly adapting to different test instruments and tested equipment and discharging before and after a test; and the multifunctional comprehensive test line is used for connecting the conversion integrated device and the tested equipment. Test items supported by the device are insulation resistance, dielectric loss capacitance, direct current resistance, transformation ratio and demagnetization tests, all power failure routine test items of the transformer can be completed without replacing a test line, the time of the power failure routine test of the transformer and the frequency of high-altitude operation can be obviously reduced, the working efficiency is greatly improved, and the test cost is reduced. And the safety risk in the test operation process is reduced.

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 provides a voltage drop acquisition circuit, a power device driving circuit and electronic equipment, and belongs to the technical field of electronics. The voltage drop acquisition circuit is suitable for acquiring the conduction voltage drop of the power device. The target device is a device on a desaturation protection path of the driving chip; the voltage sampling unit is connected with the first node and the second node of the target device, and the first node or the second node of the target device is suitable for being connected with a power device; the voltage sampling unit is used for collecting node voltages of the first node and the second node, converting the node voltages into a conduction voltage drop of the power device, and outputting the conduction voltage drop. According to the invention, the conduction voltage drop of the power device can be monitored in real time.

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.

Systems and methods provided herein relate to a power system, such as a system for a motor. A digital acquisition unit is configured to receive current sense signals associated with a motor and phase voltage power signals associate the motor. The data acquisition unit includes a module coupled to a first ground and an attenuator circuit coupled to a second ground. The first ground is isolated from the second ground. The phase voltage power signals are provided to the attenuator, and the attenuator provides phase voltage sense signals to the module.

The invention provides a power supply PCB detection device and method, and relates to the technical field of electronics, and the method comprises the steps: an impedance detection module detects the first impedance of the input end of a to-be-detected power supply PCB and the second impedance of the output end of the to-be-detected power supply PCB, and transmits an impedance detection result to a processing module; the power-on test module is used for supplying power to a power supply PCB to be tested, collecting a first output voltage under a no-load condition, and transmitting a power-on test result to the processing module. The on-load test module connects the output end of the to-be-tested power supply PCB to a load, tests a second output voltage, and transmits an on-load test result to the processing module; the processing module judges whether short circuit abnormity exists according to the impedance detection result, judges whether no-load performance is abnormal according to the power-on test result, and judges whether on-load performance is abnormal according to the on-load test result. By implementing the technical scheme of the invention, the effect of improving the detection efficiency of the power supply PCB is achieved.

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 utility model discloses a pointer type ammeter with an overload protection device, and belongs to the technical field of electrical instruments. A pointer type ammeter with an overload protection device comprises a housing, a dial, a rotating shaft and a pointer, the dial is provided with a circular hole, the rotating shaft penetrates through the circular hole, the pointer is connected with the rotating shaft, the pointer is located above the dial, the pointer type ammeter also comprises a hairspring arranged on one side of the rotating shaft, one end of the hairspring is fixed on the dial, and the other end of the hairspring is fixed on the housing. And the other end of the hairspring is opposite to the pointer. The pointer type ampere meter with the overload protection device can protect itself when overload occurs in the current transmission process.

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.

A pump system for a wellsite and a method of providing measurements to a controller are provided. Systems and methods provided herein relate to power systems, such as systems for electric machines. The digital acquisition unit is configured to receive a current sense signal associated with the electric machine and a phase voltage power signal associated with the electric machine. The data acquisition unit includes a module coupled to a first ground and an attenuator circuit coupled to a second ground. The first ground is isolated from the second ground. The phase voltage power signal is provided to the attenuator, and the attenuator provides a phase voltage sense signal to the module.

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.

A test object includes a first semiconductor element, a first main electrode electrically connected to a positive electrode of the first semiconductor element, a second main electrode electrically connected to a negative electrode of the first semiconductor element, and a first capacitor connected between the first main electrode and the second main electrode. A semiconductor testing device comprises a DC power supply connected between a first probe and a second probe, and a controller. When the first probe is connected to the first main electrode and the second probe is connected to the second main electrode, the controller charges the first capacitor with a DC voltage supplied from a DC power supply, and inputs, to a control electrode of the first semiconductor element, a control signal for turning on the first semiconductor element, after charging the first capacitor.

The utility model discloses a portable multifunctional manual operator, relates to the technical field of circuit protection, and mainly aims to provide a power supply short-circuit protection function for an instrument debugging tool. The main technical scheme of the utility model is as follows: the portable multifunctional manual operator comprises a functional circuit module; wherein the positive electrode end of the functional circuit module is sequentially connected to the PMOS transistor, the first anti-reverse connection diode, the first self-recovery fuse and the positive electrode wiring terminal through a first wire, and the negative electrode end of the functional circuit module is sequentially connected to the NMOS transistor, the second self-recovery fuse and the negative electrode wiring terminal through a second wire.

The utility model discloses a MOS damage detection circuit for a lithium battery, comprising a resistor R134, a resistor R5, a resistor R8, a resistor R163, a resistor R200, a resistor R141, a resistor R154, a resistor R167, a resistor R168, a diode D27, a diode D28, a transistor Q26, a transistor Q27, a transistor Q34 and a MOS tube QD15, wherein one end of the resistor R134 is connected to a capacitor C16, a resistor R163, a resistor R8, an emitter of the transistor Q27 and a +12V voltage. The MOS damage detection circuit for a lithium battery of the utility model can detect the state of the MOS in real time during the operation of the equipment, and timely disconnect the current through a single chip microcomputer at the moment when the MOS is damaged, so as to protect the equipment in real time, and the application is more flexible and real-time detection is performed.

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.