440 results about "Switched current" patented technology

The invention discloses an in-memory computing array and an operation method thereof, and belongs to the technical field of semiconductors and CMOS hybrid integrated circuits. A 2T1R in-memory computing array based on subthreshold current is designed, each unit in the array is composed of a memristor, a gate tube T1 and a reading tube T2, write-in and erase operations are similar to a 1T1R array architecture, but read-out is carried out through the transistor T2 working in a subthreshold region, the reading current generated by the reading tube is small, and the read-in and erase operations can be carried out through the memristor, the gate tube T1 and the reading tube T2. And the parallelism degree of in-memory calculation is increased, and ultrahigh parallel calculation of 100-1000 orders of magnitude can be realized. And meanwhile, the reading current of the reading tube T2 is in exponential correlation with the gate voltage, so that a larger switching current ratio can be obtained, and a reading window of the in-memory calculation unit is amplified. Compared with a 1T1R array architecture, more complex in-memory calculation operation can be realized, and an operation strategy can be flexibly selected, so that more efficient multiply-accumulate operation is realized.

A control system for an AC-DC converter includes a mixed-signal power controller and first and second gate drivers. The controller has a digital module and an analog module. The analog module has a current sensor generating a current sense voltage based on a sensed switch current. The digital module has a DC voltage sensor generating a DC sense voltage based on a DC bus voltage, and an AC voltage sensor generating an AC sense voltage and a binary polarity signal based on the AC voltage. The digital module induces the first gate driver to output first and second control signals for controlling a high-side switch and a low-side switch of a current shaping half-bridge based on first and second clock signals and the comparator voltage, such that an inductor current flowing through an inductor is proportional to a current command value.

The invention discloses a high-voltage LDO turn-back type overcurrent protection feed-forward circuit and an overcurrent protection method based on the high-voltage LDO turn-back type overcurrent protection feed-forward circuit. The high-voltage LDO turn-back type overcurrent protection feed-forward circuit comprises an LDO loop and an overcurrent protection loop. The LDO loop is used for generating an output voltage according to an input reference voltage of the first operational amplifier and providing a detection current and a feedback voltage; the over-current protection loop is used for introducing detection current, so that the positive end voltage of the second operational amplifier is increased, when it is detected that the positive end voltage is higher than feedback voltage, over-current protection is triggered to open the switch current mirror, and the switch current mirror controls the output end voltage of the first operational amplifier; and the current of the output end of the first operational amplifier is accurately copied to the output end of the LDO loop.

The invention discloses a control method, a control device and a switching power supply, the control method is applied to a three-phase converter, and the control method comprises the following steps in a time interval: a sampling signal acquisition step: acquiring a first sampling signal representing the state of each phase, the state can represent the size relation of the maximum average switching current absolute value of each phase of bridge arm; in the working mode selection step, the working mode of the corresponding phase bridge arm is selected according to the first sampling signal of each phase, and when the maximum average switching current absolute value represented by the first sampling signal is maximum, the corresponding phase bridge arm works in a clamping mode; when the maximum average switching current absolute value represented by the first sampling signal is centered, the corresponding phase bridge arm works in a CRM mode; and when the maximum average switching current absolute value represented by the first sampling signal is minimum, the corresponding phase bridge arm works in a TCM mode. According to the invention, soft switching conditions can be provided for the three bridge arms of the three-phase converter.

The invention provides an electrical performance calibration device and method for fusing electrolytic hydrogen production and a hydrogen fuel cell. The electrical performance calibration device comprises an upper computer, a first digital sampling voltmeter, a second digital sampling voltmeter, a synchronous data acquisition card, a synchronous inspection switch, a current converter, a voltage converter, an electric pile, a programmable power supply, a self-calibration module and an external calibration signal source, the synchronous inspection switch is used for detecting a single-cell voltage bus of a galvanic pile and feeding back the single-cell voltage bus to a sampling end of the first digital sampling voltmeter, and a feedback end of the first digital sampling voltmeter is connected with a first input end of the upper computer; the current converter is used for detecting a current loop of the galvanic pile; the voltage converter is used for detecting the total voltage of the electric pile; and the programmable power supply is connected with a power supply terminal of the electric pile. According to the invention, the problems of poor synchronism, lack of self-calibration, low impedance measurement precision and incompatibility of two-way metering during electrical performance calibration of electrolytic hydrogen production and hydrogen fuel cells are solved.

The invention provides a switching power supply device comprising a transformer which comprises a primary winding and a secondary winding and is used for converting an input voltage into an output voltage; the primary switching tube is connected with the primary winding and controls the on-off of the primary winding; the rectifying unit is connected with the secondary winding and rectifies the output of the secondary winding, and the rectifying unit comprises a semiconductor field effect transistor; the control unit is connected with the rectification unit and generates a control signal so as to control the switch of the semiconductor field effect transistor through the control signal; the current detection unit detects the output current and generates a current detection signal; the control unit receives the current detection signal and adjusts the control signal according to the current detection signal. According to the device, the COOLMOS with small internal resistance and high switching speed is adopted, the switching loss is reduced, the switching signal is dynamically adjusted by the control unit according to the real-time output current, the rectification conduction loss and the switching noise are reduced, the power supply conversion efficiency is improved, and the electromagnetic interference is reduced.

Current collapse of a normally-on type dual-gate bidirectional switch is suppressed. Dual-gate bidirectional switch includes first gate, first source, second gate, and second source. Control system includes first gate drive circuit, second gate drive circuit, and controller. Controller controls first gate drive circuit and second gate drive circuit. At the time of turning on dual-gate bidirectional switch and when the potential of first source is lower than the potential of second source, controller applies a first positive voltage for a first period between first gate and first source from first gate drive circuit, and applies a voltage smaller than the first positive voltage after the first period has elapsed.

The invention discloses a battery pack energy one-time transfer method and device, relates to the technical field of energy storage, and is used for solving the problem of unbalanced energy of each single battery in a series battery pack. The device comprises a series battery pack, a central controller, a multi-way switch A, a multi-way switch B, a current sensor, an SOC detection module, a topology main circuit and a redundant battery pack. According to the method, a capacity efficiency equation is used for correcting an energy state calculation error caused by charge and discharge rate change of a single battery, and a charge and discharge energy model and a transfer current matrix are established in combination with internal loss of the battery. According to the method, each battery can reach the charge-discharge cut-off voltage at the same time in the same charge-discharge period. When the central controller detects that the battery energy is unbalanced through the SOC detection module, the battery needing energy transfer is selected through the multi-way switch A and the multi-way switch B, and energy transfer is conducted through the main circuit and the redundant battery. According to the invention, each battery can only carry out one-time energy transfer in the charging and discharging process, and compared with a traditional battery pack active equalization method, the dynamic loss in the equalization process is reduced, and the damage of repeated charging and discharging to the service life of the battery is reduced.

The invention relates to the technical field of driving circuits, in particular to a parallel current-sharing digital closed-loop active driving system, which comprises a switching tube circuit, a parallel current-sharing circuit and a parallel current-sharing circuit, the current sampling conditioning circuit obtains a switching voltage; the quiescent current identification circuit performs quiescent current identification; the dynamic current identification circuit carries out dynamic current identification; the static current-sharing closed-loop control circuit generates pulse width modulation waveforms with different duty ratios according to the static current; the dynamic current-sharing closed-loop control circuit generates pulse width modulation signals with different phases according to the dynamic current; the driving power supply adjusting circuit generates different driving voltages for the driving circuit according to the pulse width modulation waveforms with different duty ratios; the driving circuit outputs different driving voltages according to the pulse width modulation signals of different phases, and the driving voltages are used for controlling the switching current of the switching tube circuit to carry out closed-loop adjustment and dynamic and static current equalization. The problem that an existing driving circuit cannot meet parallel current sharing, steady-state current and rapid closed-loop adjustment at the same time is solved.

Disclosed are a semiconductor comprising amorphous tellurium oxide, thin film transistor and method of fabricating same. In detail, a semiconductor comprising a chalcogen atom comprising at least one selected from the group consisting of a sulfur atom (S) and a selenium atom (Se); and tellurium composite comprising a tellurium (Te) atom and tellurium oxide. A thin film transistor (TFT) fabricated based on the TeOx channel layer according to the present disclosure exhibits excellent output / transfer characteristics and superior electrical performance with high hole field-effect mobility and a high on / off current ratio of ~107.

A power stage of a switching converter contains a high-side switch and a low-side switch respectively operated by corresponding drive signals. A current-sense block generates a sensed-current signal which is blanked for a first duration upon start of a longer phase of a high-side phase and a low-side phase. The sensed-current signal is un-blanked upon end of the first duration. The current-sense block generates a first pulse starting synchronous with the start of the longer phase and with pulse-width equaling the first duration. A gate driver receives the first pulse and generates a delayed pulse starting synchronous with the start of the longer phase and with pulse-width equaling a sum of the first duration and a second duration. The gate driver generates drive signal (for the switch being driven with the longer phase) with a first logic level for a duration of at least the pulse-width of the delayed pulse.

Disclosed are a semiconductor comprising amorphous tellurium oxide, thin film transistor and method of fabricating same. In detail, a semiconductor comprising a chalcogen atom comprising at least one selected from the group consisting of a sulfur atom (S) and a selenium atom (Se); and tellurium composite comprising a tellurium (Te) atom and tellurium oxide. A thin film transistor (TFT) fabricated based on the TeOx channel layer according to the present disclosure exhibits excellent output / transfer characteristics and superior electrical performance with high hole field-effect mobility and a high on / off current ratio of ˜107.

An inductor current reconstruction circuit of a power converter can include: a switching current sampling circuit configured to acquire at least one of a current flowing through a main power transistor and a current flowing through a rectifier transistor to generate a switching current sampling signal; an inductor current generating circuit configured to generate a reconstruction signal representing an inductor current in one complete switching cycle; and where the reconstruction signal comprises the switching current sampling signal and a current analog signal generated according to the switching current sampling signal and an inductor voltage signal representing a voltage across an inductor in the power converter.

The invention provides an over-current protection circuit of an airborne computer product, which belongs to the technical field of airborne computer power supply and distribution management and comprises a power switch and an isolation circuit used for controlling a power supply output switch of a power supply. The current sampling detection circuit is used for establishing a linear relation between the detected current and the output voltage; the signal conditioning circuit is used for conditioning an output signal of the current sampling detection circuit, and when the flowing current is 0A, the output voltage of the signal conditioning circuit is 0V; the comparison circuit is used for comparing the voltage output by the signal conditioning circuit with a preset reference voltage, judging whether overcurrent occurs or not, and outputting an overcurrent signal and closing a power output channel when overcurrent occurs; the level maintaining circuit is used for maintaining the over-current signal and preventing the over-current signal from losing efficacy; after the overcurrent fault is eliminated, the overcurrent protection signal is reset through the overcurrent protection reset signal, and the power output channel is opened again. According to the invention, the safety and reliability of airborne computer products are improved.

The invention discloses a bidirectional power electronic switch, a hybrid DC circuit breaker and a control method. The bidirectional power electronic switch comprises a diode bridge module, a buffer circuit, a voltage limiting circuit and an impedance adjusting circuit. The impedance adjusting circuit is connected in parallel with two ends of the diode bridge module; the buffer circuit is connected in parallel with a breaking electronic switch in the diode bridge module; the voltage limiting circuit is connected in parallel with two ends of the breaking electronic switch; the diode bridge module controls the breaking electronic switch to switch current according to a breaking instruction of the power system; when the breaking electronic switch is locked, the buffer circuit suppresses the voltage and current changes of the breaking electronic switch in the switching process, the voltage limiting circuit limits the overvoltage level of the breaking electronic switch, and the impedance adjusting circuit reduces the oscillation frequency. The impedance adjusting circuit reduces the oscillation frequency, reduces the requirement for the reverse recovery speed of the diode, reduces the stress of the diode bridge type module, and enables a conventional common diode to be not liable to be damaged.

Systems and techniques may generally be used for delivering pulsed electrostatic fields for therapeutic purposes. In one aspect, an electrostatic-field therapy apparatus may include a power source; a pulse-rate generator that may produce gating pulses; a solid-state switching stage with at least one transistor whose control terminal receives the gating pulses and whose conduction path periodically switches current from the power source; a step-up transformer whose primary winding couples to the switching stage and whose secondary winding may output high-potential pulses; an electrode coupled to the secondary winding; and a dielectric layer disposed over the electrode so that, when a body region is placed adjacent the dielectric layer, the high-potential pulses may be capacitively transferred through the dielectric as a therapeutic electrostatic field.

The invention discloses a deicing device and a deicing method for deicing an iced line. Deicing of the iced line is completed under the synergistic effect of an opposite clamping mechanism, an electromagnetic oscillation system, a direction controller and a clamping driving mechanism. The deicing efficiency and safety are improved through cooperation of electromagnetic multidirectional oscillation and intelligent control, multidirectional impact is achieved under driving of switching current of a direction controller by means of oscillation cavities and ferromagnetic small balls arranged in a left clamping plate and a right clamping plate, ice layer stress weak areas are monitored in real time in combination with a piezoelectric sensor, accurate directional deicing can be achieved, and the deicing efficiency and safety are improved. The problem of insufficient dead angle coverage is avoided; a hydraulic push rod and connecting rod structure ensures stable opening and closing of clamping and adapts to different line diameters, a multi-direction covering deicing process is simplified through a switch integrated with a handheld rod, the frequency is optimized through dynamic regulation and control to adapt to ice thickness changes, finally, deicing energy consumption is remarkably reduced, deicing time is remarkably shortened, and meanwhile the risk that an ice layer is broken and splashed is reduced.

The invention discloses a transformer area intelligent interconnection device with a fast charging function and a control method thereof. The device mainly comprises a first current transformation module, a second current transformation module, an all-solid-state energy storage battery, a direct current charging module and a collaborative energy manager (EMS). The DC sides of the two converter modules, the energy storage battery and the input end of the charging module are all connected to a common DC bus, and the AC sides are respectively connected to the low-voltage sides of different distribution transformers. Through uniform control of the EMS, three core functions are realized: 1, during normal operation, the two converter modules are controlled to carry out power mutual assistance and reactive power regulation, the transformer load is balanced, and the voltage of the transformer area is optimized; secondly, the direct current charging module is used for rapidly charging the electric vehicle, and an energy storage battery is used for stabilizing charging power impact; and 3, when the power grid fails, switching the converter module to a grid construction mode, and establishing an island micro-grid in cooperation with the energy storage battery to guarantee power supply of a key load. According to the invention, the integration level is high, and intelligent cooperation and autonomous operation of source-network-load-storage-charging of the transformer area are realized.

The invention discloses a compensation method of a liquid flow reactive compensation capacitor, which relates to the technical field of reactive compensation, and comprises the following steps of: acquiring power grid data, calculating a required compensation capacity, and determining a to-be-switched capacitor target group; dividing the capacitor target group into a plurality of subgroups according to capacity or voltage grades, wherein each subgroup comprises a plurality of capacitor units; based on a digital twinborn model, performing time-sharing switching sequence planning on the subgroups to obtain an optimized switching safety sequence; gradually establishing terminal voltage for each subgroup in the switching safety sequence, and enabling the terminal voltage to be smoothly merged into a bus; according to the switching safety sequence, each subgroup and the internal capacitor unit thereof are sequentially switched, and the bus voltage and the switching current are monitored in real time at the same time until the reactive compensation access of the whole target group is completed, so that the problems of large switching transient impact and complex control logic of the liquid flow reactive compensation capacitor are solved.

The invention discloses a double-pulse test protection circuit, relates to the field of power electronics, and is characterized in that a third switch, a current detection device and a control module are additionally arranged on the basis of an original double-pulse test circuit, and the purpose of the scheme is to collect the current value of a loop where an inductor is located through the current detection device; when the current value of the loop where the inductor is located is larger than a preset current threshold value (the current value of the loop is too high), the first switch is automatically switched off through the control module, and then the whole double-pulse test protection circuit is switched off. The current value in the double-pulse test protection circuit is not increased any more, and the reliability and safety of the scheme are ensured.

The invention discloses an electric energy meter calibrating device capable of rapidly and stably switching current and a control method, and relates to the technical field of electric measuring instruments, the electric energy meter calibrating device comprises a high-speed current switching circuit, a synchronous control circuit, a signal conditioning circuit, a standard signal acquisition and error analysis module and a core control module; the core control module initializes parameters and predicts a current change trend, the synchronous control circuit calibrates a switching phase, the high-speed current switching circuit realizes rapid current switching and inhibits overshoot and hysteresis, the signal conditioning circuit acquires current and environmental parameter feedback, and the standard signal acquisition and error analysis module performs error calculation and compensation. And closed-loop control is formed. According to the invention, the current switching time can be shortened, the switching peak and overshoot can be suppressed, the phase stability and the detection accuracy can be improved, and the dynamic test defect of the existing device can be effectively solved.

The invention discloses a seamless range switching system and a seamless range switching method for instrument current measurement. The seamless range switching system comprises a digital-to-analog converter, an error amplifier, a first driving circuit, a first current measurement circuit, a clamping circuit, a second driving circuit, a second current measurement circuit, two analog-to-digital converters and a field programmable gate array. The first current measuring circuit converts 10 [mu] A to 30 mA low current into a first voltage signal to form a negative feedback closed loop. When the first voltage signal reaches a Zener breakdown threshold value, the clamping circuit outputs a trigger signal to start the second driving circuit, so that the two driving circuits jointly provide a total current of 30mA to 500mA for the load; the two analog-to-digital converters perform synchronous sampling, and the field programmable gate array selects digital signal output which is in a linear measurement range and has an error not exceeding + / -0.05% of a full scale. No mechanical switch exists in the switching process, the current is uninterrupted, and wide-range high-precision continuous measurement is achieved.

The invention provides a mechanical characteristic monitoring method and system for a switch cabinet, and belongs to the field of power equipment detection, and the method comprises the steps: respectively obtaining the contact stroke of each phase of contact, the isolation knife current of each phase, the grounding knife current of each phase, and the motor current of each phase of a three-phase discrete switch of the switch cabinet in the switching-on and switching-off process; obtaining opening and closing time data of the circuit breaker in the opening and closing process; obtaining stroke characteristics of each phase of contact according to the contact stroke of each phase of contact; obtaining current characteristics of each phase according to the isolating knife current of each phase, the grounding knife current of each phase and the motor current of each phase; obtaining opening and closing characteristics according to the opening and closing time data; and monitoring the mechanical characteristics of the switch cabinet according to the contact stroke characteristics of each phase, the current characteristics of each phase and the opening and closing characteristics. The comprehensiveness and the accuracy of monitoring the mechanical characteristics of the switch cabinet and the effectiveness of fault identification can be improved.

The invention discloses a power modulation method, system and device for an isolated single-phase DC-AC converter and a medium, and the method comprises the steps: firstly, carrying out the sampling of input and output voltage and current, and obtaining the size of transmission power; then determining the soft switching current of the primary and secondary side switching tubes; determining inner and outer phase shift angles according to the soft switching threshold current; calculating a switching frequency based on the transmission power; determining dead zone time of a primary side bridge arm and a secondary side bridge arm according to the phase shift angle, the switching frequency and a soft switching constraint condition; and finally generating a PWM driving signal. According to the invention, ZVS soft switching of all switching tubes on the DC side and the AC side can be realized, loss caused by operation of the switching tubes in the fourth quadrant in the dead zone time is optimized, the working operation efficiency of the converter is improved, the power control strategy is simple, and the method has high practical application value.

The epitaxial structure of the semiconductor power device and the radio frequency device comprises a substrate, a channel layer and a barrier layer which are sequentially arranged from bottom to top, and a composite electron gas interface layer is arranged between the channel layer and the barrier layer. The composite electron gas interface layer has an electron affinity distribution characteristic, a hole mobility distribution characteristic, an electron mobility distribution characteristic, an electron effective mass distribution characteristic and a heavy hole effective mass distribution characteristic. By modulating the electron affinity steep degree, the hole mobility steep degree, the electron mobility steep degree, the electron effective mass steep degree and the heavy hole effective mass steep degree of the composite electron gas interface layer, the composite hole gas concentration of the channel layer and the barrier layer is improved; the gate leakage current, the off-state drain current and the switching current ratio are increased, and the high electron mobility transistor HEMT with high output current density and high breakdown voltage is realized.

A power switch comprises a switch transistor, wherein a load path of the switch transistor is coupled between an input of the power switch and an output of the power switch, and wherein a source terminal of the switch transistor is coupled to the output of the power switch. The power switch comprises a control capacitor which is coupled between a control terminal of the switch transistor and a reference potential conductor. The power switch comprises a switchable current source configured to charge the control capacitor in a switched-on state. A method for operating a power switch is also disclosed.

This invention belongs to the field of linear motor current disturbance suppression, specifically relating to a method and system for suppressing switching current disturbances in a segmented power supply long stator linear motor. It aims to solve the problems of long switching times and large current fluctuations in existing linear motors. The invention includes: real-time tracking and acquisition of the mover position 's' of the segmented power supply long stator linear motor, and calculation of an adjustment factor 'δ' based on the current mover position 's'; applying the adjustment factor 'δ' to the proportional controller, integral controller, and feedforward controller of the segmented power supply long stator linear motor to suppress disturbances during thyristor switching, thereby achieving current disturbance suppression during the segmented power supply long stator linear motor switching process. This invention can effectively suppress the cumulative amplification of disturbance errors during the switching process of the segmented power supply long stator linear motor, achieving a rapid decrease in current and a low overshoot with a rapid increase during the switching process.

The invention discloses a source electrode, a vertical organic field effect transistor and a preparation method of the vertical organic field effect transistor. The preparation method of the source electrode comprises the following steps: preparing a source electrode precursor solution; preparing a self-assembly interface; preparing a low-dimensional material film; exposing the transfer inlet; transferring a low-dimensional material film; volatilizing the solvent; and annealing treatment. The vertical organic field effect transistor is characterized in that a grid substrate, a dielectric layer, a source electrode, an organic semiconductor layer and a drain electrode are sequentially stacked, and a test contact point is arranged on the source electrode. According to the invention, the preparation of the vertical organic field effect transistor source electrode with low roughness and low cost is realized, and a high-performance vertical organic field effect transistor device with high switching current ratio and large current density characteristics is realized.

The embodiment of the application discloses a high-voltage controllable arrester current and energy real-time monitoring protection system and method, the system comprises a high-voltage controllable arrester, the high-voltage controllable arrester comprises an arrester fixing element, an arrester controllable element and a control switch; a current measurement module for measuring current; an energy calculation module for obtaining the arrester action residual voltage and the fixed part arrester absorption energy when performing closing operation; a protection module for performing current imbalance protection and arrester energy over-limit protection. The method comprises the following steps: measuring the current of the high-voltage controllable arrester; obtaining the arrester action residual voltage and the fixed part arrester absorption energy when performing closing operation; and performing current imbalance protection and arrester energy over-limit protection. The application enables the device to exit in time under extreme operating conditions, thereby protecting the safe and stable operation of the device.