1564results about "Base element modifications" patented technology

The invention relates to the technical field of power electronic equipment testing, and discloses a special intelligent testing device and method for a power UPS, and the device comprises a multi-source power supply system which comprises a three-phase program-controlled variable-frequency power supply, a single-phase program-controlled variable-frequency power supply and a DC program-controlled power supply, the output voltage of the three-phase program-controlled variable-frequency power supply is 0-480V and is adjustable, and the output voltage of the single-phase program-controlled variable-frequency power supply is 0-480V; the output voltage of the single-phase programmable variable-frequency power supply is 0-280V and the frequency of the single-phase programmable variable-frequency power supply is 45-64Hz and adjustable; the output voltage of the direct-current programmable power supply is 50-1000V and adjustable; an electronic load system; a signal acquisition system; an embedded control system; and an upper computer software system. A three-phase program-controlled variable-frequency power supply, a single-phase program-controlled variable-frequency power supply and a direct-current program-controlled power supply are integrated to form a multi-source power supply system, a resistive and rectifying dual-mode electronic load is combined, millisecond-level synchronous switching of a voltage level and a load state is realized through an embedded control system, a closed-loop test capability of multi-dimensional performance of the power UPS is formed, and the test efficiency is improved.

The invention provides a test system and method for calibrating high-power large-current parameters, and belongs to the technical field of power electronic component testing and metering, and the system comprises a high-power large-current standard device, a standard current sensor and a high-speed data acquisition unit. The high-power large-current standard device is used for providing high-power large current for the load to be tested; and the standard current sensor and the high-speed data acquisition unit are used for calibrating the large current of the high-power large-current standard device. The high-power large-current parameter traceability is realized, and the high-power large-current parameter quantity value is ensured to be accurate and reliable.

The invention discloses an electronic load system, a power supply test method, an electronic device and a storage medium, and relates to the technical field of electrics. A main control circuit can provide a reference voltage for a current sampling and control circuit, and can also obtain load current setting parameters; the current sampling and control circuit determines a control voltage mainly by acquiring a sampling voltage and comparing the sampling voltage with a reference voltage so as to control an on-resistor in the power circuit through the control voltage and further control the magnitude of the current passing through the on-resistor, and meanwhile, the change rate of the current can be controlled due to a load current parameter. Therefore, the rapid change of the load current can be realized. Therefore, the technical problems of how to realize the rapid change of the current and improve the accuracy of the test result can be solved, and the technical effects of meeting the rapid change requirement of the current and improving the test result are achieved.

The invention relates to the technical field of capacitance compensation matching, in particular to a dynamic tuning capacitance compensation matching method and system for a transformer simulation test. The method comprises the following steps: before a test is started, establishing a digital twin model based on parameters of a transformer to be tested, identifying a systematic measurement error source caused by inherent characteristics of a system through simulation, and generating error source correction parameters; in the test period, voltage and current original waveforms containing electrical disturbance in a test loop are obtained in real time through high-frequency synchronous sampling; a mixed disturbance separation model is used, the collected original waveform and the generated error source correction parameters are used as input, and random measurement disturbance components caused by load dynamic changes are calculated and separated in real time; and based on the separated disturbance component, driving a dynamic capacitance compensation module to generate a compensatory electric signal which is equal to the disturbance component in size and opposite to the disturbance component in phase, and injecting the compensatory electric signal into a test loop so as to realize active disturbance cancellation. According to the invention, the measurement precision of the transformer simulation test can be improved.

The invention belongs to the technical field of electrical safety, and particularly discloses an insulation resistance intelligent detection system and method for an energy storage converter, and the system is based on a bridge balance structure, integrates a temperature and humidity sensor and a voltage sensor, and collects environment parameters and bridge unbalance signals in real time. A digital potentiometer and a resistor array are driven through a PID algorithm to dynamically adjust bridge balance, and environmental interference is eliminated in combination with a temperature and humidity compensation model; and carrying out intelligent analysis on the preprocessed multi-dimensional data by utilizing a band-pass filtering and detection model, and outputting a high-precision insulation resistance value. The method achieves full-automatic detection, is high in precision, is quick in response, is suitable for complex working conditions, and remarkably improves the reliability of the insulation performance evaluation of the energy storage converter.

The invention discloses a target impedance simulation circuit, an element parameter determination method and an impedance simulation jig. The target impedance analog circuit comprises a plurality of RC modules, wherein each RC module comprises a resistor unit and a capacitor unit which are connected in series; part or all of the RC modules are connected in parallel to simulate impedance data of a to-be-measured target. According to the technical scheme provided by the invention, the RC module is adopted to simulate the impedance value, so that the impedance behavior characteristics of the specified object under different frequencies can be accurately simulated, and the device can be flexibly and repeatedly used.

An apparatus for sensing current in a back-to-back MOSFET configuration is provided. The apparatus may include a first MOSFET having a gate terminal, a drain terminal, and a source terminal, a second MOSFET having a source terminal coupled to the source terminal of the first MOSFET, a gate terminal, and a drain terminal, a gate driver circuit including at least one gate drive output terminal to output a gate drive signal to the gate terminals of the first and second MOSFETs, and a shunt resistor coupled between the source terminals of the first and second MOSFETs. The gate driver circuit may include a return terminal coupled to the source terminal of the first MOSFET, and a return current from the gate terminal of the second MOSFET flows through the shunt resistor to the return terminal of the gate driver circuit.

The invention provides a high-resistance coaxial shunt, which comprises an outer conductor, a central shaft conductor and a resistor body, and is characterized in that the outer conductor, the resistor body and the central shaft conductor are of cylindrical structures and are coaxially arranged from outside to inside; the resistor body is of a laminated structure, and the conductive length of the resistor body is larger than the physical length of the resistor body in the laminated state. According to the high-resistance coaxial shunt provided by the invention, the resistor body is arranged to be of the laminated structure, so that the conductive length of the resistor body can be effectively prolonged, and the resistance value is increased under the condition that the conductive area and the physical length of the resistor body are not changed. The invention also provides a current detection system.

The invention provides a weak current acquisition circuit and electronic equipment, which are applied to the field of control or regulation systems, and the circuit converts an input current signal to be processed into a corresponding first voltage signal through a first analog switch, a second analog switch and sampling resistors corresponding to different gear control signals; the operation integration unit is used for amplifying the first voltage signal and generating an integration voltage signal, and then the analog-to-digital conversion unit is used for converting the integration voltage signal into a digital voltage signal; a control unit collects the digital voltage signal and calculates a target current value corresponding to the current signal to be processed according to the digital voltage signal. The circuit provided by the embodiment of the invention can be used for amplifying the current signal to be processed, carrying out analog-to-digital conversion on the integral voltage signal and acquiring the corresponding digital voltage signal according to the preset digital filtering algorithm, and can effectively reduce the influence of noise on the acquisition precision in the weak current acquisition process.

The invention provides an automatic testing device for an electrical interface of hardware equipment, which comprises a core control unit, an AT32F415CBT7 single chip microcomputer, an RS232 serial port testing interface and an RS485 serial port testing interface, the test unit comprises eight paths of optical coupling isolation switching value input / output interfaces, a test module power supply input interface, a 24V power supply input interface of equipment to be tested, a state indication LED module and a vacancy detection module which are respectively used for host communication and equipment test, and a travel switch is adopted to detect the occupation state of the test unit, wherein the 24V power supply input interface of the equipment to be tested is powered by an ejector pin. According to the invention, the efficiency and accuracy of hardware equipment interface function testing can be improved, the labor cost is reduced, and batch detection requirements are met.

The invention discloses a differential noise traction system and a differential signal noise parameter measurement method and device, and belongs to the field of chip measurement. The system is characterized in that a vector network analyzer comprises four ports, the input ends of two impedance tuners are respectively connected to a differential output port pair of the vector network analyzer, the output ends of the two impedance tuners are respectively connected to the differential input end of a tested device, the differential output end of the tested device is connected to the receiving end of a noise receiver, and the noise receiver is connected to the output end of the noise receiver. The output end of the noise receiver is respectively connected to a differential receiving port pair of the vector network analyzer; the direct-current power supply is used for supplying power to the tested device and the switch controller, and the switch controller is used for controlling an internal switch of the noise receiver; the differential output port pair generates a differential signal; the differential receiving port pair is used for receiving noise power of a differential signal; and the impedance tuner is used for adjusting the impedance point, so that the differential signals input to the tested device correspond to different differential impedances. The method can improve the measurement precision.

The invention discloses a TVS tube state monitoring circuit and a protection circuit of an EFUSE circuit, and relates to the technical field of electronic fuses, and the protection circuit comprises a fuse, a first switching circuit, a second switching circuit, a short circuit detection circuit, an open circuit detection circuit and a control module. And the control module judges whether the TVS tube is open-circuited or short-circuited according to feedback signals of the short-circuit detection circuit and the switch detection circuit, so that the state of the TVS tube is monitored in real time.

The embodiment of the invention discloses an insulation resistance detection circuit and an insulation resistance detection device of a battery module, and belongs to the technical field of resistance detection. Wherein the insulation resistance detection circuit comprises a detection port for detecting to-be-detected insulation resistance of the port to the ground, and the detection port of the insulation resistance detection circuit is connected to the positive electrode of any cell in the battery module; the processor is respectively connected with the first switch, the second switch and the voltage sampling unit, and is used for determining an impedance value of the to-be-detected insulation impedance and a voltage value of the detection port based on the voltage sampled by the voltage sampling unit in a process of controlling the connection or disconnection of the first switch and the second switch; when the insulation impedance of any cell is determined to be abnormal based on the impedance value of the to-be-detected insulation impedance, the number of cells to which any cell belongs in the battery module is determined based on the voltage value of the detection port, and the cells with abnormal insulation impedance in the battery module can be accurately determined.

The invention relates to a current measuring apparatus for redundant measurement of an electric current (I) with a low-resistance current measuring resistor (1) for current measurement according to the four-lead technique and with a magnetic field sensor (14). The invention provides that the electric current (I) to be measured in the current measuring apparatus is divided into a main current path with a main current (I1) and a secondary current path with a secondary current (I2), the main current path and the secondary current path together forming a parallel circuit. The low-resistance current measuring resistor (1) is arranged in the main current path and has the main current (I1) flowing through it, while the magnetic field sensor (14) is arranged in the secondary current path and measures the secondary current (I2).

The invention provides a zero-carbon battery charging and discharging test system and method. The system comprises a plurality of energy storage energy modules, a plurality of energy allocation modules connected with the plurality of energy storage energy modules, a plurality of non-isolated high-efficiency charging and discharging machines, a plurality of test side intelligent switches connected with the plurality of non-isolated high-efficiency charging and discharging machines, and a plurality of tested batteries connected with the plurality of non-isolated high-efficiency charging and discharging machines. The first controller is used for collecting state information of the plurality of energy storage energy modules and controlling working states of the plurality of energy allocation modules so as to adjust electric energy exchange between the plurality of energy storage energy modules and the direct current bus; the DC bus is connected with the plurality of energy allocation modules and the plurality of test side intelligent switches, and is used for establishing an electric energy transmission path between the plurality of energy storage energy modules and the plurality of tested batteries. And the second controller is connected with the plurality of test-side intelligent switches and is used for controlling on and off of the plurality of test-side intelligent switches so as to realize charging and discharging tests of the plurality of tested batteries.

A chip test system and method are provided. The chip test system includes a memory chip, a test device, and a test interface. The memory chip has a power pad and a driver pad coupled to the power pad. The test device is configured to provide a test signal. The test interface is configured to provide multiple signal transmission paths. The test device transmits the test signal to the power pad of the memory chip through the test interface, obtains a monitor voltage generated by the driver pad, and adjusts a test voltage value of the test signal according to the monitor voltage. The test device comprises a precise measurement unit configured to measure the monitor voltage, and a switch element coupled to the precise measurement unit, and when the memory chip starts to be tested, the switch element is turned on.

The invention relates to a Hall thruster discharge disturbance acquisition device and a Hall thruster discharge disturbance acquisition method, which are used for solving the technical problems of relatively low accuracy and reliability of an acquisition result of a Hall thruster discharge disturbance acquisition device in the prior art. According to the Hall thruster discharge disturbance acquisition device provided by the invention, the oscilloscope is used for measuring voltage and current changes of anode and cathode ignition, when the changes exceed a preset value, an acquisition triggering signal is sent to the high-speed camera while electric signal acquisition is automatically triggered, and the high-speed camera synchronously acquires an optical signal; and dual acquisition of photoelectric signals is realized.

The invention relates to the technical field of battery production, in particular to a ternary lithium battery production quality detection method and device.The ternary lithium battery production quality detection device comprises a temperature control box, a fixing rod is fixedly connected to the inner side of the temperature control box, a detection mechanism used for battery current detection is installed on the outer side of the fixing rod, and the detection mechanism comprises a second C-shaped installation plate; the inner wall of the second C-shaped mounting plate is provided with a maintenance mechanism used for preventing spontaneous combustion of a battery, the inner wall of the second C-shaped mounting plate is fixedly connected with a first mounting plate, the front end of the first mounting plate is provided with two sets of symmetrical CCD cameras, and a servo motor drives a fixed rotating shaft and a gear transmission system; a second C-shaped mounting plate drives a direct-current clamp meter to rotate, meanwhile, a battery body rotates reversely through a synchronous belt and a gear structure, 360-degree surrounding scanning of the detection ring on the outer side of the battery is achieved, a second electric telescopic rod drives an arc-shaped cleaning plate to be attached to a pole, an oxide layer is automatically removed, and contact resistance increase caused by impurities is avoided.

A test switch assembly for testing electrical switchboard devices is provided. The test switch assembly includes a test switch including a handle, the handle having a first color. The handle includes a label holder including a front, the label holder defining a label slot in the front, the label slot sized to receive a label. The handle further includes a handle body extending from the label holder and defining a tie bar aperture sized to receive a tie bar configured to connect the test switch with one or more other test switches in the test switch assembly. The test switch assembly further includes an indicator coupled with the handle body of the test switch, the indicator having a second color different from the first color, the indicator exposing the tie bar aperture.

The invention discloses a short-circuit working condition dynamic resistance test circuit and method based on a clamping circuit, the dynamic resistance test circuit comprises a clamping circuit and a short-circuit test circuit, and the clamping circuit and the short-circuit test circuit are respectively connected with two ends of a device to be tested; the short-circuit test circuit is used for providing a short-circuit working condition for the to-be-tested device in a short-circuit test stage of the to-be-tested device; the clamping circuit is used for providing a stable measurement voltage level for the measurement circuit and providing a test working condition for the to-be-tested device in the dynamic resistance test stage of the to-be-tested device, and the dynamic resistance recession representation after the GaN HEMT short circuit working condition can be effectively measured.

The present disclosure relates to apparatus and methods for determining a transfer function of a current measurement arrangement (118), or a change in a transfer function of the current measurement arrangement. In one aspect, an apparatus is disclosed comprising: a signal source (112) configured to apply a reference signal to a first current transducer (110) such that a first transducer output signal from the first current transducer comprises: a current measurement signal indicative of the first current passing through a first conductor (104); and a reference signal component resulting from the reference signal; and signal processing circuitry (116)configured to determine the transfer function of the current measurement arrangement by: extracting the reference signal component from the first transducer output signal; and determining the transfer function of the current measurement arrangement based on the transducer output signal.

The invention provides an AC solid-state power controller isolation voltage acquisition circuit device, and the device comprises an AC voltage acquisition unit which is used for achieving the voltage acquisition of an AC solid-state power controller; the isolated power supply unit is used for providing an isolated power supply for the alternating-current voltage acquisition unit; the reference voltage unit is used for providing reference voltage for the AC voltage acquisition unit; and the power supply unit provides a power supply for the AC voltage acquisition unit. According to the technical scheme of the invention, the size of the sampling circuit can be reduced while voltage acquisition is realized, and the acquisition precision and safety of the sampling circuit are improved.

A plurality of resistors are disclosed herein. The resistor may include one or more resistive elements and a plurality of conductive portions. Openings or slots, which can be configured to adjust temperature coefficient or resistance (TCR) values of the resistor, are formed in the resistive elements. The shape, quantity, and orientation of the openings or slots can vary. In one aspect, header assemblies are provided for securing or holding pins relative to the resistors.

The invention provides a simulation method and system with controllable split-phase voltage drop time difference, and relates to the technical field of electric power testing, and the method comprises the steps: adjusting voltage through a three-phase voltage regulator, employing a bidirectional silicon controlled rectifier and IGBT hybrid switch structure to achieve voltage drop, collecting and processing a three-phase voltage signal through a digital signal processor, and extracting zero crossing point information; and a control pulse signal with phase compensation is generated, the conduction time sequence of the switch element is controlled to realize soft switching, and the industrial computer receives and processes the signal and displays a voltage drop waveform. The split-phase voltage drop time difference can be accurately controlled, and the simulation precision and the system reliability are improved.

The invention discloses a method for monitoring the insulation state of a stator winding of an injection unit based on neutral point harmonic frequency sweeping. The invention provides an active online monitoring method based on harmonic injection for stator winding insulation of a full-power variable-speed pumped storage unit. A common-mode loop is constructed for a motor stator winding of a network side transformer neutral point ungrounded system through a motor neutral point grounded transformer, and therefore online monitoring of the insulation state of a motor stator is achieved. In order to solve the measurement problem of the full-power variable-speed pumped storage unit under the large-current working condition, a neutral point outgoing line current detection technology is adopted. A machine end large current interference area is avoided, monitoring is carried out on the primary side of the grounding transformer, transmission errors are avoided, and the measurement precision and reliability of insulation monitoring signals are remarkably improved. According to the invention, harmonic injection is carried out by avoiding an inherent common-mode component of a unit, a monitorable leakage current signal is enhanced, and the accuracy of insulation equivalent capacitance calculation is ensured.

The invention belongs to the technical field of aerospace, and discloses an aviation electrical system insulation detection device which comprises a shell and an overall frame serving as the insulation detection device. The display screen is used for displaying measurement data in real time; the function key group integrates the functions of measurement mode switching, data retention and insulation test starting; according to the conversion assembly, through the linkage design of the rotating disc and the rotating switch, the problem that functions cannot be switched when the two hands of a traditional insulation detection device are occupied is thoroughly solved, a worker only needs to rotate the rotating disc with the hand of supporting equipment, the rotating switch can be driven through the driving mechanism, switching of insulation test voltage gears is completed with one hand, and the working efficiency is improved. Compared with a traditional device which needs to frequently put down a connecting line and manually rotate a switch, the design simplifies the operation steps from three steps to one step, shortens the single function switching time, and remarkably improves the efficiency and safety of high-altitude operation or narrow space detection.

The invention discloses a formation and capacity grading parallel detection system based on a high-voltage direct-current bus. A press device comprises a direct-current switch and at least one set of pull-out type charging and discharging probe module. And the input end of the direct-current switch is connected with the output end of the PCS equipment. Each charging and discharging probe module adopts a pull-out structure and comprises a mechanical frame, and a high-voltage direct-current bus, a bidirectional conversion module and a probe assembly which are integrally mounted in the mechanical frame; the high-voltage direct-current bus input end is connected with the direct-current switch output end; the bidirectional conversion module comprises two stages of conversion units; the first conversion unit is used for reducing the first voltage of the high-voltage direct-current bus into the second voltage or reversely increasing the voltage; the second conversion unit reduces the second voltage to the voltage required by charging and discharging of the battery or boosts the second voltage; the probe assembly is connected to the output end of the second conversion unit. The system is compact in structure, high in charging and discharging efficiency and convenient to maintain, and cables are saved.

Systems and Methods for capacitance testing of a unit under test with parasitic capacitance directed to a guard rail. The system includes test points, wherein the plurality of test points are divided into at least two groups; a stimulus source; a first group guard relay electrically connected to each of the test points in a first; a second group guard relay electrically connected to each of the test points in a second; a guard rail coupled to the first group guard relay and the second group guard relay; a first group return relay electrically connected to each of the test points in a first group; a second group return relay electrically connected to each of the test points in a second group; a current measurement rail coupled to the first group return relay and the second group return relay; a current meter coupled to the measurement rail; and a controller.

A source measure unit has a voltage output stage to provide a voltage across first and second output terminals to connect to a load, and a current output stage to provide a voltage to a first sense resistor, the source measure unit to switchably employ both the voltage output stage and the current output stage for a first range of output current, to regulate a common point, and either output voltage or output current, or employ only one of either the voltage output stage or the current output stage to provide voltage to both the first and second output terminals and a second sense resistor for a second range of output current, and to regulate either output voltage or output current.

According to the radio frequency device strong electromagnetic pulse damage on-line monitoring method and system, the incident power, the output power and the reflection power of the tested radio frequency device are monitored in real time, then whether the tested radio frequency device is damaged or not is judged through comprehensive comparison and analysis, and the function of monitoring the state of the tested radio frequency device on line in real time is achieved. The device is used for monitoring the damage state of the radio frequency device under the strong electromagnetic pulse injection test in real time, the test efficiency is improved, the damage probability to the strong electromagnetic pulse injection source after the radio frequency device is damaged is reduced, and the test range of a traditional off-line measurement method of the test is expanded. The device is used for on-line damage monitoring during the strong electromagnetic pulse injection test of the radio frequency device, the test efficiency can be improved, test equipment can be protected, the defects of traditional off-line detection can be overcome, and the device has important significance in carrying out the strong electromagnetic pulse injection effect test of the radio frequency device and obtaining the damage threshold value of the radio frequency device.