177 results about "Inductive load" patented technology

The invention belongs to the technical field of unmanned aerial vehicle full-aviation electromagnetic detection, and particularly relates to a full-aviation frequency domain electromagnetic emission system and a control method. A broadband frequency mixing and matching circuit is connected in series between an H-bridge power inverter and an emission coil of an unmanned aerial vehicle electromagnetic emission system; the broadband mixing and matching circuit comprises a first resonance unit formed by connecting a fixed capacitor and an adjustable inductor in parallel and a second resonance unit formed by connecting a fixed capacitor and an adjustable inductor in parallel, and the first resonance unit and the second resonance unit are connected in series. The adjustable inductor is matched with the dynamic impedance of the inductive load by adjusting the inductance value, and the broadband frequency mixing and matching circuit can adjust the impedance in real time, so that the matching of different resonant frequencies is realized, and the frequency range of a matching signal can be obviously widened.

The invention discloses an audio and video data transmission anti-interference method and system based on coding error correction, relates to the technical field of audio and video data transmission, and is used for solving the problem that centralized error burst occurs in audio and video data transmission due to periodic strong electromagnetic interference generated by high-power inductive load equipment in an industrial production environment. The method comprises the following steps: acquiring predicted interference occurrence time, duration and reference intensity range of high-power inductive load equipment in an industrial production environment; detecting the channel quality of a transmission link to obtain the actual starting time and ending time of interference, the influence on a specific frequency range and the specific mode and length of error burst; predicting interference occurrence time according to an interference rule; generating a transmission strategy adjustment instruction according to the priorities of the multiple paths of audio and video streams; and according to the transmission strategy adjustment instruction, carrying out coding error correction or transmission time sequence adjustment on the multiple paths of audio and video streams before the interference occurrence time.

The invention discloses a current distortion suppression method and device for an N-phase AC-AC conversion system, and relates to the field of voltage conversion control, and the method comprises the steps: determining the ideal sine reference current of an xth phase, obtaining the actual input current of the xth phase in a current control period and the actual output current of the xth phase corresponding to an inductive load, and determining the current variation of the xth phase; and determining a difference value between the ideal sine reference current of the x-th phase and the actual input current as a real-time current distortion error signal of the x-th phase, further determining a compensation duty ratio of the x-th phase for suppressing current distortion by combining a preset duty ratio compensation strategy, and further determining a target duty ratio of the x-th phase as a target PWM signal. According to the scheme, the input current of each phase can be monitored, inductive load disturbance can be responded, the compensation duty ratio of the x-th phase used for restraining current distortion can be dynamically adjusted so as to determine the target duty ratio, the current distortion of the input current can be effectively restrained, and the input current can follow ideal sine reference current.

A load driver includes an active clamping circuit coupled between gate and source terminals of a power stage. The active clamping circuit serves to either pass through a gate drive voltage (provided by a gate driver) to the power stage in a PWM mode or to actively clamp the voltage between gate and source terminals of the power stage to enable fast decay recirculation in fast decay mode (when the load driver is configured for active clamping). A semi-active recirculation driver is coupled between ground and the output of the power stage. The semi-active recirculation driver serves to either provide a low impedance recirculation path in the PWM mode or to passively clamp the output voltage to provide for a fast decay recirculation path in fast decay mode (when the load driver is configured for passive clamping).

The invention relates to a cyclic aging test device for a power semiconductor device with a three-level three-phase bridge twin-dragging structure, which comprises a three-phase bridge test unit, a host control board and a slave control board, and is characterized in that the three-phase bridge test unit comprises a host three-phase bridge, a slave three-phase bridge and a three-phase inductive load with the same three-phase bridge structure; the three-phase bridge is connected with a power semiconductor device; the direct current ends of the host three-phase bridge and the slave three-phase bridge are connected in parallel, and the same group of direct current power supply Vdc supplies power to the host three-phase bridge and the slave three-phase bridge; the alternating current ends of the host three-phase bridge and the slave three-phase bridge are interconnected through the three-phase inductive load to form a twin-trawling structure; the slave control panel controls the voltage output of the three-phase bridge arm as the target of the current closed-loop control of the host control panel, and the host control panel simulates the actual working state of the power semiconductor device by adjusting a control strategy. The device has the beneficial effects that various real working conditions are simulated, and the cyclic aging test of the system-level AC type power semiconductor device is realized.

The invention discloses wafer dynamic parameter testing equipment which is provided with a testing device and a probe card for testing a wafer which is placed on a probe table and is internally provided with a to-be-tested device, and the probe card is provided with a plurality of probes connected with the to-be-tested device and a plurality of conductive contact pieces connected with the probes respectively. A connecting module of the testing device is provided with a plurality of connectors connected with conductive contact pieces, a high-voltage capacitor electrically connected with a high-voltage power supply in the testing device is connected with an inductive load module through a power switch, the inductive load module is connected with the connectors, and a control module is connected with a chip to be tested through the connectors. The control module realizes the dynamic parameter test of the device to be tested in the wafer by controlling the power switch to be turned on and turned off according to a certain time sequence, and the matching value of the probe card and the connector can reduce spurious oscillation signals so as to effectively improve the accuracy of the dynamic parameter test of the wafer. And therefore, the chip testing efficiency can be improved and the chip cost can be reduced.

The invention provides a power distribution network partition optimization method and system. The method comprises the steps that a non-inductive load characteristic index set is constructed, non-inductive load characteristic indexes are constructed into characteristic vectors, electrical attributes of a power supply unit are constructed into attribute vectors, and then a two-dimensional evaluation model is constructed; obtaining a plurality of candidate partitions based on electrical attributes of the power supply units, calculating a comprehensive evaluation value of each load point and each power supply unit through a two-dimensional evaluation model, distributing each load point to the candidate partitions meeting a preset partition requirement through the comprehensive evaluation value, obtaining a preliminary partition scheme, constructing a global optimization model, and obtaining a final partition scheme; and optimizing each candidate partition to obtain a preliminary partition optimization scheme, constructing a corresponding power flow balance equation, and locally adjusting the preliminary partition optimization scheme to obtain a power distribution network partition optimization scheme so as to optimize the power distribution network partition. According to the invention, multi-dimensional evaluation is carried out on the power distribution network to optimize the reasonability of load division of the power distribution network, so that the operation reliability of the power grid is improved.

The application discloses an electromagnetic detection optimized bipolar SHMPWM transmitting method, which comprises the following steps: S1, by analyzing the influence of the resistive and inductive load on the transmitting current waveform distortion and the transmitting spectrum energy loss, extending the current waveform based on the equal-area principle, compensating for the lost transmitting current spectrum energy, and calculating the current waveform extension time; S2, considering the inductive load and the dead zone effect, establishing a bipolar SHMPWM nonlinear equation set; S3, using the particle swarm algorithm to iteratively operate the bipolar SHMPWM nonlinear equation set, and obtaining the solving result of the switching angle of the half-cycle symmetric SHMPWM. The application adopts the optimized particle swarm algorithm to solve the equation set to obtain the switching angle, and realizes that the frequency domain information of the half-cycle symmetric SHMPWM frequency focusing waveform conforms to the specific harmonic amplitude set by the expectation.

The invention provides an FRD chip detection method and platform. According to the method, a switch device and an inductive load module are controlled, a preset forward conduction working condition is established at an FRD chip, and when the FRD chip is in a forward conduction state, the switch device is controlled to switch the conduction state, so that reverse voltage is applied to the two ends of the FRD chip, and the reverse recovery process of the FRD chip is triggered. And then, synchronously acquiring the terminal voltage waveform of the FRD chip and the inductive current waveform associated with the inductive load module to obtain test data. Then, determining a reverse recovery characteristic parameter and an overvoltage characteristic parameter of the FRD chip under the inductive load working condition based on the test data, and finally, evaluating the FRD chip based on the reverse recovery characteristic parameter and the overvoltage characteristic parameter. Therefore, the technical problem that the dynamic performance of the FRD chip under the inductive load cannot be accurately evaluated under the traditional test condition is solved.

The invention discloses a continuous current pulse generation circuit for power device testing and a control method thereof, and relates to the technical field of power electronics, the continuous current pulse generation circuit comprises a power supply, a control unit, a switch unit, an energy storage unit, an inductive load and a current absorption unit; the switch unit comprises a first relay, a second relay, a third relay, n first switches and one second switch; the energy storage unit comprises n capacitors; the control unit is used for respectively controlling the on-off of the first relay, the second relay, the third relay, the n first switches and the n second switches, carrying out different-stage control on each capacitor, and providing continuous current pulse for the test of the power device; the different stages comprise a capacitor charging stage, a capacitor discharging stage according to a time sequence and a capacitor residual charge releasing stage. According to the invention, more real continuous current pulse can be provided for the power device, and the reliability test requirement of the device under the impact of the continuous current pulse is met.

A driver circuit, including: a transistor including a ground side electrode, a control electrode, and a power supply side electrode for an inductive load to be connected thereto; a first resistor connected to the control electrode; a line connected to the first resistor; a second resistor provided between the line and a ground; a first diode, including a cathode connected to the line and an anode, the first diode being connected in parallel with the second resistor; and a second diode including a cathode connected to the line, and an anode for connecting to a capacitor, thereby receiving a voltage generated in the capacitor for driving the transistor.

The invention relates to the technical field of SiP power modules, and discloses a SiP power module integrated by SiCMOSFETs (silicon carbide metal oxide semiconductor field effect transistors) and diodes on a single chip for a medium-power and high-power energy storage power supply. Comprising a chip, the chip is composed of a single-chip integrated SiCMOSFET unit and a diode, the rear surface of the chip is provided with a module packaging plate, the front surface of the chip is provided with a substrate, the front surface of the substrate is connected with the SiCMOSFET unit and the diode, the rear surface of the substrate is provided with a first pin wire, the first pin wire is connected with the chip in a spot welding mode, and the first pin wire is connected with the chip in a spot welding mode. According to the invention, through the monolithic integration and optimized low-inductance packaging design of the SiCMOSFET and the diode and the combination of the advantages of the SiC material, the ultrahigh-frequency working capability, the extremely high conversion efficiency, the excellent thermal performance and the extremely high power density are realized at the same time, the system design is greatly simplified, the excellent reliability and the protection capability for inductive load switching are provided, and the application range is wide. Therefore, the power supply can be applied with high efficiency, high power density and high reliability, such as a medium-high power energy storage power supply.

This invention discloses a control circuit based on a hybrid switching timing of relays and thyristors. By connecting the thyristor in parallel with the relay, the thyristor bears the load current before and after the relay is closed, thus avoiding contact arcing. The control unit triggers the thyristor at the AC zero-crossing point, reducing switching losses and electromagnetic interference, and combines an RC snubber circuit with optocoupler isolation to improve reliability. This device can increase the relay lifespan from 20,000 cycles to 500,000 cycles, and its cost is only 1 / 3 that of a solid-state relay, making it particularly suitable for soft-start control of high-current inductive loads.

An integrated circuit (IC) includes an array of compute units and control circuitry for mitigating supply voltage overshoot. Each compute unit contributes to an aggregate time rate of change of current drawn by the IC when transitioning between processing and non-processing states. The control circuitry is configurable to stagger when each compute unit is eligible to transition from processing data to not processing data relative to other compute units, thereby limiting the negative rate of change of current through inductive loads of the IC and preventing voltage overshoot above a maximum threshold. The control circuitry may be distributed among the compute units and configured using statically reconfigurable parameters that specify the maximum number of compute units permitted to transition concurrently and the minimum number of clock cycles between successive group transitions.

An externally cooled high efficiency induction coil system is formed from a substantially planar electrically conductive strip, machined or 3D printed from solid copper or a copper alloy defining a multiturn solenoidal induction coil. Each turn of the multiturn induction coil is separated by a separation gap dimensioned to produce a low-variance heating pattern in a magnetically coupled inductive load or workpiece when an alternating current is supplied to the induction coil. A cooling fluid is forced over the induction coil and through the gap width to externally cool the induction coil via forced convection. The substantially planar electrically conductive strip may further include a plurality of crests and troughs defining a wave structure to increase surface area in contact with the cooling fluid and thereby increase efficiency in heat transfer.

The utility model discloses a low pressure series compensation device relates to the technical field of compensation circuit, including the soft start power supply circuit for controlling starting current slow rise, the surge impact is suppressed, the capacitive reactive power output for the dynamic regulation series capacitor, the low pressure reactive power compensation circuit of compensation inductive load's reactive power shortage, the voltage detection circuit for real -time tracking circuit voltage fluctuation, generates the voltage feedback signal required for compensation control. The utility model discloses through the voltage detection circuit, thereby through the accurate detection of resistance voltage dividing network and operational amplifier IC1, realizes real -time monitoring and signal conditioning to the grid voltage, ensures that compensation system can accurately obtain voltage variation information, provides reliable data support for reactive power compensation control.

DC-DC converter with an output-side storage capacitor arrangement for providing an operating voltage for an inductive load and for at least one further electronic circuit and / or electronic component of a vehicle electronics, wherein the storage capacitor arrangement is connected to the DC-DC converter via a reverse-biased diode (6) and the output-side storage capacitor arrangement is connected to a parallel circuit consisting of an electrolytic capacitor (1), a ceramic capacitor (2) and a circuit arrangement is formed with a series connection of a hybrid electrolytic capacitor (3) and a suppressor diode (4) and a resistor (5) connected in parallel to the hybrid electrolytic capacitor (3), wherein the hybrid electrolytic capacitor (3) has a lower series resistance than the electrolytic capacitor (1) and a larger capacitance than the ceramic capacitor (2), so that in the event of energy being fed back from the inductive load into the storage capacitor arrangement, the hybrid electrolytic capacitor (3) absorbs a large proportion of the energy and thus prevents a voltage increase at an output terminal above a value at which connected components can be destroyed, wherein the output terminal is the cathode terminal of the diode (6) and the inductive load can be connected to the output terminal.

The invention discloses an energy-consuming valve power module cyclic aging test platform and a cyclic aging test method, which are suitable for reliability verification of a direct-current energy-consuming device power module. Through collaborative design of a capacitive power supply and an inductive load, closed-loop utilization of energy is realized, and modularized alternating test logic is adopted, so that the test efficiency is improved. A direct-current power supply is used for providing a current source for a test loop, a test object is a test valve section formed by connecting a plurality of power module units in series, the test loop is composed of two test valve sections, and the two test valve sections are tested objects mutually. The design of the series energy consumption valve power module enables a plurality of tested modules to be subjected to cyclic aging at the same time. According to the invention, the power circulation of the energy consumption branch can be realized, and the data obtained through the test can be applied to key scenes such as health condition evaluation and control logic judgment of the IGCT device.

The invention provides a short circuit test circuit and a test device, and relates to the technical field of semiconductor testing, and the short circuit test circuit comprises a drive circuit, a test control circuit, a first load circuit, a second load circuit and a switching circuit. The first controlled end of the test control circuit and the first end of the first load circuit are both used for receiving test voltage. The first end of the switching circuit is connected with the second controlled end of the test control circuit, the second end of the switching circuit is connected with the second end of the first load circuit, the third end of the switching circuit is connected with the first end of the second load circuit, the second end of the second load circuit is grounded, and the second load circuit comprises an inductive load; a first output end of the driving circuit is connected with a control end of the test control circuit, a second output end of the driving circuit is used for connecting a control end of a to-be-tested device, a first end of the switching circuit is used for connecting a first controlled end of the to-be-tested device, and a second end of the second load circuit is used for connecting a second controlled end of the to-be-tested device.

The application discloses a load switching circuit, a load switching method and a household device, wherein a receiving module, a control module, a resistive load module and an inductive load module are included. The receiving module acquires an instruction signal; the receiving module sends the instruction signal to the control module; the control module determines a load module corresponding to the instruction signal according to the instruction signal, selectively controls the resistive load module or the inductive load module to work, receives a control signal transmitted by the control module through the receiving module, and transmits the control signal to the resistive load module and the inductive load module; according to specific instructions of the control signal, it is determined whether the resistive load module or the inductive load module works, different load type modules work according to user requirements, and the problem that different loads require different topological circuit requirements is overcome.

This invention discloses a circuit for suppressing back electromotive force (EMF) in a wire-feeding motor, comprising: a protection filter circuit, a half-bridge circuit, a half-bridge drive circuit, and an overvoltage monitoring and braking circuit. The protection filter circuit is connected to the power bus to prevent backflow of EMF into the power bus and to perform filtering. The half-bridge circuit is connected to the protection filter circuit and an external motor. The half-bridge drive circuit is connected to the half-bridge circuit to drive the half-bridge circuit and drive the motor to rotate. The overvoltage monitoring and braking circuit is connected to the protection filter circuit and the half-bridge drive circuit to monitor the voltage of the power bus. When the voltage of the power bus is too high, it performs rapid discharge and simultaneously drives the motor to stop rotating through the half-bridge drive circuit. This invention fundamentally cuts off the path of backflow of the back EMF generated by the motor or inductive load to the power supply by connecting a power diode D1 in series on the bus and utilizing its unidirectional conductivity.

The utility model belongs to the technical field of measurement, and particularly relates to experimental test equipment for measuring the current change rate, which comprises a base and a vertical plate, the vertical plate is fixedly arranged at the end part of the left side of the base, a capacitor is fixedly arranged on the inner side surface of the vertical plate, and the base and the vertical plate are of an integrated structure; a coil is rotationally fixed to the side, close to the vertical plate, of the top of the base, a wire groove is fixedly formed in the side, away from the vertical plate, of the top of the base, and the wire groove is in a 7 shape. According to the experimental test equipment for measuring the current change rate, based on the current change characteristics of an inductance element and a capacitance element, according to the Faraday's law of electromagnetic induction, when current changes in an inductive load, induced electromotive force is generated and counteracts current change, transient voltage fluctuation is caused, meanwhile, the capacitance element stores and releases energy, and the current change rate is measured. The current fluctuation is smoothed, and the transient change of the current is slowed down, so that reliable data support is provided for a power system, motor control and other electronic applications.

The invention relates to an operation method of a bootstrap gate drive circuit device with negative bias. The bootstrap gate drive circuit device with negative bias provides first to fourth pulse width modulation control signals with different waveforms for the bootstrap gate drive circuit device with negative bias in a low-end transistor synchronous drive interval, a high-end transistor synchronous drive interval and a transformer working interval in sequence for operation. Through waveform operation on the first to fourth pulse width modulation control signals in the low-end transistor synchronous driving interval and the high-end transistor synchronous driving interval, a third capacitor to a sixth capacitor respectively establish respective stable negative bias voltages, so that normal PWM switching action can be carried out in the transformer working interval, and the voltage of the transformer working interval is reduced. And the problem that the transistor half-bridge structure is easy to oscillate under inductive load switching can be avoided.

The utility model discloses a pulse insulation and voltage resistance testing device based on pulse waveform width. The pulse insulation and voltage resistance testing device comprises a pulse generator, a tested object, a voltage differential circuit, a high-speed AD conversion circuit and a pulse storage judgment circuit. A pulse signal output by the pulse generator is collected by the voltage differential circuit, is converted into a digital signal by the high-speed AD conversion circuit, and is transmitted to the pulse storage and judgment circuit for waveform analysis. And the microcontroller calculates the maximum value and the waveform width of the pulse waveform according to a preset algorithm, and compares the maximum value and the waveform width with a standard waveform so as to judge whether the detected product is broken down or not. Different from a traditional current-dependent judgment method, weak insulation breakdown can be accurately identified by measuring the width of the pulse waveform, and the influence of capacitive or inductive load on a judgment result is avoided. The device has the advantages of high precision, high efficiency and strong stability, can be widely applied to pulse insulation and voltage resistance tests of electrical equipment, and provides reliable electrical safety guarantee.

To provide a drive circuit capable of preventing malfunction of a transistor that drives a load.SOLUTION: A drive circuit includes: a transistor having a power source side electrode to which an inductive load is connected, a ground side electrode and a control electrode; a first resistor connected to the control electrode; a line connected to the first resistor; a second resistor provided between the line and a ground; a first diode that has a cathode connected to the line and an anode and is connected in parallel with the second resistor; and a second diode having a cathode connected to the line and an anode. A capacitor in which a voltage for driving the transistor is generated is connected to the anode of the second diode.SELECTED DRAWING: Figure 3

A method (100) for operating an inverter (1) wherein the inverter selectively connects three AC phases (U, V, W) of an inductive load (4) to the positive or negative terminal of a DC voltage (2) provided at the input terminal (1a) of the inverter (1) by manipulating switching elements (3a-3f) arranged in three half-bridges (5a-5c), wherein the switching state (110) of the switching elements (3a-3f) is changed by rotating space vector modulation, wherein, additionally, when the space vectors (6a-6f) having the same switching state of the corresponding switching elements (3a, 3d; 3b, 3e; 3c, 3f) of at least one half-bridge (5a-5c) are modulated, such half-bridges (5a-5c) remain completely off (120).

A drive state detection device includes a current detection unit configured to detect a drive current during driving of an inductive load; a voltage detection unit configured to detect an interterminal voltage during the driving of the inductive load; a variable filter configured to allow passage of a component of a predetermined frequency pass band, the component being of the drive current detected by the current detection unit; a signal generation unit configured to generate a pulse signal from a waveform of the drive current after the passage through the variable filter; and an arithmetic logic unit configured to detect a state of the inductive load in accordance with the drive current detected by the current detection unit, the interterminal voltage detected by the voltage detection unit, and the pulse signal generated by the signal generation unit.

Power supply unit (10), comprising: an output semiconductor element (11) provided between a power supply line (Vcc) and an output terminal (OUT), and which is controlled and switched to supply electrical energy to an inductive load connected to the output terminal (OUT); and a clamping circuit (15) which clamps a voltage applied between the power supply line (Vcc) and the output terminal (OUT) due to a counter-electromotive force with respect to an operating reference voltage of the output semiconductor element (11), wherein: the counter-electromotive force is generated in the inductive load when the output semiconductor element (11) switches OFF, the output semiconductor element (11) consists of a semiconductor element with an insulated gate electrode that can switch high electrical energy, the clamping circuit (15) comprises a switching semiconductor element (14) and an operating voltage adjusting diode, the switching semiconductor element (14) is connected by a backflow blocking diode between a gate of the semiconductor element with insulated gate electrode and the power supply line (Vcc), and The operating voltage setting diode determines an ON operating voltage of the switching semiconductor element (14) with respect to the operating reference voltage of the semiconductor element with insulated gate electrode.

The invention belongs to the technical field of automotive electronics, and relates to an electronic controller with driving overvoltage clamping for an inductive load, which comprises a clamping circuit I, a power supply anti-reversing and power supply switching circuit, a clamping circuit II, an overvoltage detection circuit, a microcontroller, an inductive load driving circuit and a connection relation thereof, a power supply path in the electronic controller is divided into two parts, namely a power supply end and a load power supply end, by a power supply anti-reversing and power supply switching circuit controlled by an overvoltage detection circuit, and clamping circuits and devices of the power supply end and the load power supply end are relatively independently selected; therefore, clamping devices with low power and different clamping voltages can be respectively used at the power supply end and the load power supply end. And by reducing the clamping voltage of the load power supply end, a device with a relatively low withstand voltage value can be selected at the driving end, so that the flexibility of a device type selection scheme is improved, and the cost of the controller is reduced.

To properly adjust a pass frequency band of a variable filter by following a change of a drive current waveform depending on the temperature change of an induction load.SOLUTION: A drive state detection device includes a current detection unit, a voltage detection unit, a variable filter, a signal generation unit, and a computation unit that detects the state of an induction load on the basis of a drive current, an inter-terminal voltage, and a pulse signal. The computation unit has an approximate equation calculation unit that calculates an approximate equation of a drive current waveform on the basis of a plurality of peak points extracted from the drive current waveform, a peak current calculation unit that calculates a peak current in the induction load from the approximate equation calculated by the approximate equation calculation unit, a resistance value calculation unit that calculates a resistance value of the induction load on the basis of the peak current calculated by the peak current calculation unit and the inter-terminal voltage detected by the voltage detection unit, and an adjustment unit that calculates a frequency corresponding to the resistance value calculated by the resistance value calculation unit, and adjusts a prescribed pass frequency band in the variable filter so as to allow the calculated frequency to pass.SELECTED DRAWING: Figure 3