560 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.

The invention provides an intelligent electronic switch, a current detection device, a chip, a chip product and an automobile. The intelligent electronic switch comprises a sampling end, a power switch and a control circuit. The control circuit can collect output current of the power switch and obtain first sampling current, when the first sampling current is smaller than or equal to reference current, the control circuit outputs a first indication signal to the microcontroller and outputs the first sampling current through the sampling end, and when the first sampling current is larger than the reference current, the control circuit outputs a second indication signal to the microcontroller. A second indication signal is output to the microcontroller and a second sampling current is output through the sampling end, the second indication signal is different from the first indication signal, and the second sampling current is smaller than the first sampling current and is related to the first sampling current; in this way, the microcontroller can determine the output current of the power switch according to the obtained indication signal and the collected signal, and the problem that the detection result of the microcontroller is possibly inaccurate is solved.

The present invention comprises Magnetic Tunnel Junctions and Bit-Patterned Media with a warped geometry with the purpose of attaining large thermal stability factors and dramatically increasing the scalability of the magnetic bits while still allowing the reduction of switching current density and switching magnetic field, and also increasing switching speed. The warped shape allows providing thermal stability to the bits through dynamic exchange energy barrier and also by providing additional net magnetic anisotropy through shape-induced reduction of the demagnetization field. The dynamic exchange energy barrier in turn allows engineering the damping torque and the free-layer's magnetic parameters to a much larger extent than the current planar technology. It also allows much faster magnetic-field-induced switching of patterned bits than it is possible with current hard disk drive technology, through the use of precession torque instead of conventional damping torque.

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.

A flying capacitor converter, a voltage converter and an energy storage system are provided. The flying capacitor converter includes a high-voltage side, a low-voltage side, a power switch unit, a current switch unit and a current detection unit. The high-voltage side is electrically connected with a first power source. The low-voltage side is electrically connected with a second power source. The power switch unit is electrically connected between the high-voltage side and the low-voltage side and includes three terminals and four power switches. The current switch unit is electrically connected with the high-voltage side, the low-voltage side and / or a common node. The current detection unit is electrically connected between a third terminal of the power switch unit and the common node. If the current detected by the current detection unit indicates that a short-circuit condition occurs, the power switch unit is disconnected from the high-voltage side and / or the low-voltage side.

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 relates to a circuit breaker for an electrical circuit. The circuit breaker (100) is arranged between a power supply (302) and a load (304), wherein the circuit breaker (100) comprises control means (104) configured to switch switching means (106) of the circuit breaker (100) between an ON-mode in which a current i is fed to the load (304), and an OFF-mode in which no current is fed to the load (304); wherein the control means (104) is configured to obtain a value of the current i fed to the load (304) when the switching means (106) is in the ON-mode; keep the switching means (106) in the ON-mode if the value of the current i is smaller than a switching current is of the circuit breaker (100); switch the switching means (106) into the OFF-mode if the value of the current i is larger than the switching current is of the circuit breaker (100); and switch the switching means (106) from the OFF-mode back into the ON-mode after a first time interval Furthermore, the invention also relates to a circuit and a method.

A switching power supply control method includes the following: after the high-voltage startup of the switching power supply, the secondary control module adjusts the cut-off current of the second switching transistor according to a voltage waveform at a second connection point until a voltage waveform at a first connection point just reaches zero, the primary control module controls the first switching transistor to be turned on; the primary control module adjusts the peak current of the first switching transistor until the peak current of the first switching transistor reaches a preset value, the primary control module controls the first switching transistor to be turned off; the secondary control module controls the second switching transistor to be turned on; and in case where the switching current of the second switching transistor is at a current zero-crossing point, the secondary control module controls the second switching transistor to be turned off.

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 relates to the technical field of power management in an integrated circuit, in particular to an ultra-low noise LDO with a programmable current limit and quick start. Comprising a reference current generating circuit, an RC filter, a first negative feedback loop, a control resistor, a comparison control circuit, a programmable current limiting circuit, a sampling tube MP0 and a first switch current source. The first negative feedback loop comprises an error amplifier, a buffer stage and a power tube MP1; before the LDO is started, current limit programming is achieved; after current limit programming is finished, the LDO starts to start, an LDO quick start control signal is generated through the programmable current limit circuit, an extra charging path is provided for the RC filter circuit through the constant current source, and quick start of the ultralow-noise LDO is achieved; when the output voltage of the LDO is close to a preset value, the quick starting circuit is closed; according to the LDO, the current limit is adjustable, the protection capability to the rear stage is improved, and the reliability of the whole system is enhanced.

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 belongs to the technical field of cable health status assessment, and particularly relates to a live monitoring system and device for detecting the health status of a cable in operation, and the system comprises a potential difference determination module, a live detection module, a leakage current collection module, an insulation voltage collection module, a health assessment module and a score output alarm module. The device comprises a single-phase switch, a current transformer, a high-precision voltage transmitter, a processor and a memory. According to the method, the maintenance frequency and depth can be dynamically adjusted according to the score, lean management is realized, a more flexible early warning mechanism is provided, cable maintenance is more targeted and flexible, the unnecessary maintenance frequency is greatly reduced, and the maintenance efficiency is improved. The problem that in the prior art, unnecessary maintenance is too frequent, and consequently computing power is wasted is effectively solved.

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.

A control device for a two-stage solenoid valve, including an activation unit which outputs a current flowing through a solenoid coil of the solenoid valve as a switching signal. The solenoid valve is switchable from its de-energized switching state into its energized switching state by increasing a current intensity of the switching signal from zero to a switching current intensity. The solenoid valve is switchable from its energized switching state into its de-energized switching state by designing the activation unit to set the current intensity of the switching signal during a switching time interval to at least one current intensity value between zero and the switching current intensity, reduce it to zero after the switching time interval and during the switching time interval, increase it at least twice, each for a predefined pulse time interval, to a predefined current pulse value between zero and the switching current intensity.

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.

A circuit breaker includes an electromechanical switch, a current sensor, a voltage sensor, and a processor. The electromechanical switch is connected in series between a line input terminal and a load output terminal of the circuit breaker and is configured to be placed in a closed state or an open state. The current sensor is configured to sense a magnitude of current flowing in a path between the line input terminal and the load output terminal and generate a current sense signal. The voltage sensor is configured to sense a magnitude of voltage at a point on the path between the line input terminal and the load output terminal and generate a voltage sense signal. The processor is configured to receive and process the current sense signal and the voltage sense signal to determine operational state information of the circuit breaker and to determine power usage information of a load connected to the load output terminal.

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.