281 results about "Switched current" patented technology

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.

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.

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.

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.

Provided are a hotspot list display method and apparatus, an electronic device, and a storage medium. The method includes playing a target video in a first video play page; receiving a first slide operation on the first video play page, where the first slide operation is used for switching current display content of the first video play page; and in response to the first slide operation satisfying a trigger condition for displaying a hotspot list, playing a preset video of the hotspot list on the first video play page, displaying the hotspot list in a layer on the preset video, and displaying video items of multiple hotspot videos in the hotspot list.

The invention discloses a forklift charging pile off-peak electrical load control circuit, which comprises a main power supply, a control power supply, a plurality of charging units, a circuit breaker and a current transformer, and is characterized in that the control power supply comprises a plurality of contactors arranged in parallel, and each charging unit is connected with the control power supply through the contactor; the charging set 1 is connected with the contactor KM1, the charging set also comprises a time control switch, a current transducer, relays, an overcurrent alarm and a grouping control circuit, the overcurrent alarm and the contactor KM1 are arranged in parallel, the relay K1 is controlled by the time control switch, the charging set 1 is powered on by turning on the time control switch, and whether a coil of the contactor KM1 + N is powered on is determined by the relay K1 + N; and the overcurrent alarm KA is in a normally closed state when not overloaded and is disconnected after overload. The timing load hierarchical control is realized by using the combination of the time control switch, the feedback current and the comparator, and an overcurrent alarm signal is used as a re-hierarchical switching and re-delay timing signal, so that the control circuit is greatly simplified, and the control circuit is simple and reliable.

A method is provided for controlling a circuit arrangement for power semiconductors of an inverter with at least one phase, comprising a high-side switch and a low-side switch, each of which has at least two power semiconductors connected in parallel, wherein the power semiconductors are formed from different semiconductor types, and wherein the use of a technology is specified for each switch for operation after a switching operation, wherein a technology is either the use of power semiconductors of one of the semiconductor types and / or the use of a combination of power semiconductors of different semiconductor types, wherein in a preliminary step a limit value for a blocking voltage (or for a current gradient at a specified switching current and a specified intermediate circuit voltage) is determined for each of the power semiconductors.and in the event of exceeding or falling below this limit, depending on which technology is currently active, a switch to the currently inactive technology is specified during the next switching process.

The invention discloses an ultrahigh-voltage constant-voltage clamping transmitting system for an electrical source transient electromagnetic method, and belongs to the technical field of ultrahigh-voltage constant-voltage clamping. Comprising a main power supply, an auxiliary power supply, a clamping capacitor, a main switch bridge circuit, a clamping switch, a current sampling module, a peak holding module, a comparator and a controller. According to the invention, the waveform quality of the high-power electromagnetic transmitter can be effectively improved, and the transmitting performance is improved from two aspects of a rising edge and a falling edge. Development of a near-source electromagnetic method including SOTEM is promoted, and more powerful technical support is provided for a deep prospecting strategy.

The invention provides a multi-resonant switched capacitor efficient cooperative operation method suitable for battery active equalization, and the method comprises the steps: building a zero-voltage soft switching realization condition model of a single-module resonant unit, and determining the amplitude constraint and direction constraint of a soft switching current needed by a switching tube for realizing zero-voltage switching; based on topology, identifying current paths of the half bridges located at the top layer, the middle layer and the bottom layer in the soft switching transient process, and determining a mathematical relationship between the soft switching current of each layer of half bridge and the current of each resonant cavity; respectively establishing equivalent circuit models at switching moments for the top-layer half-bridge, the middle-layer half-bridge and the bottom-layer half-bridge, and solving to obtain each initial current value of the corresponding junction capacitor voltage at the switching moments; and substituting each initial current value obtained by solving into the established constraint condition, and drawing an operation parameter boundary of the topology capable of realizing soft switching in all working modes. According to the invention, by determining the operation boundaries of all half-bridge soft switches of the multi-resonant switched capacitor structure, the switching loss is reduced, and the operation efficiency is improved.

In one example, an apparatus comprises a bidirectional switch substrate bias circuit. The bidirectional switch substrate bias circuit comprises: a first switch coupled between a substrate bias terminal and a first switch current terminal, the first switch having a first switch control terminal; a second switch coupled between the substrate bias terminal and a second switch current terminal, the second switch having a second switch control terminal; and a control circuit having first and second inputs and first and second outputs, the first and second inputs coupled to the respective first and second switch current terminals, and the first and second outputs coupled to the respective first and second switch control terminals, the control circuit configured to, responsive to respective states of the first and second inputs, enable one of the first or second switches and disable the other one of the first or second switches.

An improved auxiliary power module for use with electric vehicles is provided. The auxiliary power module includes a reconfigurable dual active bridge converter for providing either of a voltage-fed input or a current-fed input to a primary-side full bridge. The auxiliary power module also includes a current-fed output port that integrates an interleaved buck stage and presents an ultra-wide voltage coverage. The auxiliary power module achieves low switching currents on the secondary-side of the dual active bridge converter with low current stresses on the output port, which reduces losses and the transformer turn ratio when compared to conventional topologies.

The invention relates to the technical field of power control, in particular to a filter and leakage inductance collaborative design method of a single-stage bidirectional high-frequency isolation inverter, which comprises the following steps: acquiring basic design parameters, constructing an inverter modulation model according to a modulation strategy, and solving the model to obtain a modulation signal expression; deriving a zero-current switching current constraint condition and a zero-voltage switching current constraint condition of the switching tube based on a modulation strategy; combining the constraint condition with an inverter modulation model, and solving to obtain a soft switching constraint condition; according to the soft switching constraint condition and the value range of the modulation signal expression, determining a collaborative value range of the filter inverter side inductance and the transformer leakage inductance meeting the soft switching requirement; and selecting design parameters of inverter side inductance and transformer leakage inductance of the filter, and determining other circuit parameters of the filter according to a reactive power demand and a grid-connected harmonic standard. According to the invention, the problems of soft switching failure, loss increase and electromagnetic interference caused by parameter mismatching can be effectively suppressed.

A circuit (300) includes a power semiconductor device (310) and a current mirror circuit (320). The power semiconductor device (310) is located in a switched current path (315) between a switching node (620) and a reference potential. The current mirror circuit (320) includes a first transistor (Q1) and a second transistor (Q2) and mirrors a reference current IRef through the first transistor (Q1) by controlling an output current Iout through the second transistor (Q2). The first transistor (Q1) is outside the switched current path (315) and is electrically connected in series with the power semiconductor device (310) in a first current path (100). The second transistor (Q2) is located in a second current path (200). The first current path (100) and the second current path (200) are electrically connected in parallel.

The invention discloses a hybrid direct current circuit breaker based on series voltage injection and parallel current injection, which comprises a main circuit, a series injection module, a parallel injection module and a main power electronic module, and is characterized in that when a main loop generates a fault current, the series injection module injects a reverse voltage to the main loop by utilizing the coupling effect of a transformer; reducing the fault current of the main loop and inhibiting the rising rate; the parallel injection module enables a main loop to inject oscillation current in parallel through high-frequency on-off operation, so that mechanical switch current in the main loop oscillates around 0 at high frequency and low amplitude, and arc-free breaking of a mechanical switch MS is guaranteed; and the main power electronic module is turned off after the MS contact is completely separated, and fault current is absorbed through a capacitor in the main power electronic module to finish circuit breaking. According to the circuit breaker disclosed by the invention, under the condition of ensuring low on-state loss during normal operation of a line, no-arc breaking of a mechanical switch is ensured, the pressure of a power electronic device is greatly reduced, and particularly, the pressure of a current device needing to be turned on and turned off at high frequency is reduced.

The application discloses a kind of self-synchronization voltage source type new energy field station optimization method, system and storage medium, and the present application determines high short-circuit ratio new energy field station and low short-circuit ratio new energy field station according to new energy field station short-circuit ratio, low short-circuit ratio new energy field station is set to self-synchronous voltage source mode operation, and the risk of low short-circuit ratio new energy field station is set to self-synchronous voltage source mode operation under the constraint of fault transient passive switching current source low wear control operation, based on current wind and light abandonment, to improve the key section transmission capability margin as target, optimize the power generation of self-synchronous voltage source mode operation new energy field station and standby capacity, can effectively improve the key section transmission capability margin of power grid, conducive to reducing new energy field station wind and light abandonment.

The embodiment of the invention provides semiconductor testing equipment and a current gear switching method and device thereof, and relates to the technical field of semiconductor testing. The current gear switching method is applied to semiconductor test equipment, and comprises the following steps: detecting whether a first switching instruction sent by an upper computer is received or not; if a first switching instruction is detected, a first smooth transition module is controlled to be connected to a circuit in the current gear switching process, and based on a plurality of resistance values output by the first smooth transition module under the current current gear, a current current gear module is firstly disconnected, and then a target current gear module is closed; or if the first switching instruction is detected, the target current gear module is firstly closed and then the current current gear module is disconnected based on the capacitance value which is output by the second smooth transition module and corresponds to the current current gear. According to the embodiment of the invention, the problem of test failure easily caused by transient voltage abrupt change when the current gear is switched in the prior art is solved.