147 results about "Switched current" patented technology

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.

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 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.

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 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.

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.

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.

Clock phase tuning method including supplying a current (lout) to a capacitor (CL) when first and second clock signals (CK1, CK2) are at a first logic state to generate an voltage (Vout) across the capacitor during a first interval; supplying or drawing a current (lout) to or from the capacitor based on an enable signal when the first and second clock signals are at first and second logic states to generate the voltage across the capacitor during a second interval; drawing a current from the capacitor when the first and second clock signals are at the second logic state to generate the voltage during a third interval; drawing or supplying current from or to the capacitor based on the enable signal when the first and second clock signals are at second and first second logic states to generate the voltage across the capacitor during a fourth interval; and generating a clock signal (Ckout) based on the voltage.

The invention discloses a coaxial vertical double-transistor capacitance-free dynamic random access memory unit and a preparation method thereof, and belongs to the field of semiconductor integrated circuits. According to the DRAM unit, a writing transistor and a reading transistor are three-dimensionally integrated in the form of a coaxial cylinder, the reading transistor is located in an inner core, and the writing transistor is coaxially wrapped on the periphery. According to the structure, the occupied area of the unit is reduced to the projected area of one nanorod, the limit density of 4F2 can be reached theoretically, and a storage capacitor of a traditional DRAM is thoroughly removed. And the peripheral write transistor forms a Faraday cage, so that the storage nodes are effectively prevented from being interfered by the outside, and the data retention capability is remarkably improved. The read transistor of the kernel naturally forms a surrounding gate structure, has an extremely high switching current ratio, and provides a strong read-out signal. The invention also provides a preparation process compatible with the unit. The cell structure is suitable for a next generation memory product with high density and low power consumption.

A control circuit for a universal serial bus (USB) is provided. The control circuit includes a blocking switch, a current source circuit, a discharge circuit, and a controller. The blocking switch is connected between a power supply terminal of the USB and a bus power terminal of the USB. Before supplying power to the bus power terminal, the controller turns off the blocking switch and controls the discharge circuit to pull down an output voltage value at the bus power terminal. When the output voltage value is lower than or equal to a set voltage value, the discharge circuit stops pulling down the output voltage value, and controls the current source circuit to provide a test current to the bus power terminal. The controller obtains a resistance value at the bus power terminal based on the output voltage value and a current value of the test current.

The invention relates to a step switch unit (2) for sequentially switching currents, comprising at least two switching contacts (3) and a switching unit (4) with actuators (5) which are arranged on the switching unit (4) above the switching contacts (3) at different distances from them, wherein the switching contacts (3) and the switching unit (4) are arranged relative to each other such that when pressure is applied to the switching unit (4) in the direction of the switching contacts (3), the actuators (5) are pressed onto it and different actuators (5) touch the switching contacts (3) at different pressure forces. wherein the switching unit (4) extends at least partially over the switching contacts (3) and has a planar reset area (R) made of an elastic plastic material which exerts a force on the actuators (5) directed away from the switching contacts (3). Furthermore, the invention comprises an operating device (1) and a medical device.

This application provides a current acquisition circuit and a current acquisition device, belonging to the field of current measurement technology. The current acquisition circuit includes a controller and a first current acquisition module and a second current acquisition module connected in series. The first current acquisition module includes a first current acquisition element and a first processing circuit connected in parallel. The second current acquisition module includes a second current acquisition element, a second processing circuit, and a first control circuit connected in parallel. The first processing circuit is used to acquire and process a first voltage signal from the first current acquisition element and output the first voltage signal to the first control circuit and the controller. The second processing circuit is used to acquire and process a second voltage signal from the second current acquisition element and output the second voltage signal to the controller. The first control circuit is used to turn on when the current corresponding to the first voltage signal exceeds a second current range and to turn off when the current corresponding to the first voltage signal is within the second current range. This current acquisition circuit can solve the interference of switching current ranges on current measurement.

The application discloses a kind of calibration devices, it is related to test technical field, calibration device includes voltage source, current source, switching circuit module and detection circuit, voltage source is used to output calibration voltage;Current source is used to output calibration current;Switching circuit module one end is electrically connected with voltage source, current source, the other end of switching circuit module is used to be electrically connected with the equipment to be measured;Switching circuit module is used to switch the connection of voltage source and the equipment to be measured on, or switching current source and the connection of the equipment to be measured on;Detection circuit is electrically connected with the equipment to be measured, for detecting the actual voltage of equipment to be measured when voltage source and the equipment to be measured connection on, to carry out voltage calibration to equipment to be measured according to calibration voltage and actual voltage;Actual current of equipment to be measured is detected when current source and the equipment to be measured connection on, to carry out current calibration to equipment to be measured according to calibration current and actual current.The output current voltage of calibration current transformer and other equipment to be measured.

An apparatus may include an input, an output, a current source, a first switch configured to electrically couple the current source to the output, a current sink, a second switch configured to electrically couple the current sink to the output, and a driver configured to modulate states of the output to reflect states of the input by: detecting a first input state of the input, changing the output to a first output state corresponding to the first input state of the input by electrically coupling, via the first switch, the current source to the output, detecting a second input state of the input; and changing the output from the first output state to a second output state corresponding to the second input state of the input by electrically coupling, via the second switch, the current sink to the output. Various other apparatuses, systems, and methods are also disclosed.

The application discloses a non-contact point loop closing method and system, which is applied to a power distribution network loop closing control device, receives a non-contact point loop closing instruction, closes a series circuit breaker, measures a power distribution network contact switch current, controls a series transformer secondary side current to be equal to the contact switch current through an inverter, disconnects the power distribution network contact switch, measures a first substation access point voltage U1 and a second substation power supply voltage U2s, controls the series transformer secondary side voltage to be equal to U2s-U1 through the inverter, so that the voltage across the second substation power supply circuit breaker is equal, closes the second substation power supply circuit breaker, the inverter stops outputting, and the non-contact point loop closing is completed. Advantages: the application has the advantages of high regulation ratio, low equipment cost and small occupied area, provides the non-contact point loop closing method, avoids loop closing impact and loop current, and can realize non-power-off power supply when the power supply of a power-off substation needs to be restored to supply power to the substation load, thereby improving power supply reliability.

Switching converters, control circuits and control methods thereof are disclosed. A switching converter includes a power switch and converts an input voltage to an output voltage. The control circuit includes an output feedback circuit that generates an output voltage feedback signal representative of the output voltage, a compensation current generating circuit coupled to the output feedback circuit and generating a compensation current signal based on the output voltage feedback signal and an output voltage reference signal, a current-to-voltage converting circuit generating a peak voltage signal based on the compensation current signal and a current sampling signal representative of a current flowing through the power switch, and a comparing circuit comparing the peak voltage signal with a reference signal and generating an off control signal to control the off of the power switch. The switching converter can significantly reduce the overshoot or undershoot of the output voltage when a load step occurs.

In various embodiments, a method for operating a contactor (S3, S4) is provided, comprising: adjusting the switching current flowing through the contactor (S3, S4) during the switching process to a regeneration value that is greater than the switching current during regular operation of the contactor (S3, S4). Furthermore, an electrical operating environment with a contactor is provided.

The invention provides a matrix filtering assembly based on coaxial switch control and a filtering device, the matrix filtering assembly based on coaxial switch control comprises an acquisition module, a filtering module and a control module, the acquisition module acquires a filtering gating signal, the control module receives the filtering gating signal, and the filtering module receives the filtering gating signal; a multi-channel coaxial switch in a filtering module is automatically controlled based on the filtering gating signal, so that a current filtering channel is switched to a target filtering channel, the filtering module comprises a plurality of filtering channels with different filtering parameters, and the signal source is output after being filtered by the target filtering channel. According to the matrix filtering assembly based on coaxial switch control, switching of the filtering channels can be directly achieved according to the input filtering gating signal, the multi-frequency-point automatic testing process is supported, mechanical contact and manual operation are reduced, the matrix filtering assembly can be applied to multiple different scenes, and the control cost is low.

Current steering digital-to-analog converters (DACs) are described. These DACs are suitable for high speed operation. Weight transistors conventionally used in DACs are replaced with resistors, resulting in a lower RC constant. Further, the resistors cause a smaller voltage drop, thus improving the voltage headroom of the DAC. Additionally, the current steering switches are biased in the triode region, as opposed to the saturation region as in conventional designs. Biasing the switches in the triode region results in a smaller drain-source voltage, which further improves the voltage headroom of the DAC. The triode operation further results in a substantially smaller output impedance, which leads to the output voltage being dictated primarily by the output transistor of the current path. Lastly, reset switches are added which reduce data-dependent memory effects that can otherwise produce distortion.

The application provides an overcurrent protection circuit of an airborne computer product, and belongs to the technical field of power supply and distribution management of airborne computers, and comprises a power switch and an isolation circuit, which are used for controlling a power supply output switch; a current sampling detection circuit, which is used for establishing a linear relationship between a measured current and an output voltage; a signal conditioning circuit, which is used for conditioning an output signal of the current sampling detection circuit, and outputs a voltage of 0V when the current flowing through is 0A; a comparison circuit, which is used for comparing the voltage output by the signal conditioning circuit with a preset reference voltage, judging whether overcurrent occurs, outputting an overcurrent signal when overcurrent occurs, and closing a power output channel; and a level maintaining circuit, which is used for maintaining the overcurrent signal and preventing the overcurrent signal from failing; after overcurrent failure is eliminated, the overcurrent protection signal is reset through an overcurrent protection reset signal, and the power output channel is reopened. The application improves the safety and reliability of the airborne computer product.

The zone control unit (10) comprises a processor unit (20) and a power switch arrangement (30). The power switch arrangement (30) comprises a controllable semiconductor switch, a current sensor circuit and an overcurrent detection circuit. The current sensor circuit is designed to provide a measurement signal (ISEN) for the processor unit (20) and the overcurrent detection circuit, representing an output current which the controllable semiconductor switch provides at its first terminal (OUT). The overcurrent detection circuit is designed to deactivate the controllable semiconductor switch for an entire active operating cycle of the ZCU and / or the vehicle if the measurement signal (ISEN) exceeds a predefined first current threshold value (IPEAK). The processor unit (20) is configured to determine, during the active operating cycle of the ZCU or the vehicle, a sum (I2TSUM) of energy values by means of a software program (50) on the basis of the provided measurement signal (ISEN), and, if the sum (I2TSUM) of the energy values exceeds a predefined first energy threshold value (l2TSUM_Threschoid), to deactivate the semiconductor switch.

The application relates to the technical field of data processing, and discloses an airborne optoelectronic platform turning system, which comprises the following: a nonlinear controller, a selection switch, a current loop controller, a power driving element, a motor, a current feedback element, a speed feedback element, an angular position feedback element, a first error transformation processing unit, a position loop controller, a second error transformation processing unit and a speed loop controller. The nonlinear given value output by the nonlinear controller is used to make the airborne optoelectronic platform rotate to a preset angle. However, the nonlinear given value will cause large overshoot, which is not conducive to the requirement of fast turning stability. Therefore, the second phase current is determined through the speed loop controller and the position loop controller, and the motor is controlled by adopting the closed-loop phase second phase current, so that the airborne optoelectronic platform is rotated to a position of 180 degrees, the overshoot amount of fast turning is reduced, and the 180-degree fast turning of the airborne optoelectronic platform is realized.

The invention provides an anti-misoperation execution system and method for a relay protection system, and the system comprises a station-end five-prevention module which is used for communicating with an on-site monitoring background of the relay protection system before the power restoration operation of primary equipment, bringing a secondary abnormal signal and a pressing plate state into preset locking logic, and transmitting the locking logic to the station-end five-prevention module; the important signals are associated through the incorporated locking logic, and the primary and secondary comprehensive anti-error states of the power recovery operation of the primary equipment are evaluated; the production operation support module is used for performing real-time monitoring on key alarm signals, the opposite-side grounding knife-switch state and parallel knife-switch current calculation results in the bus reversing process through an interface connected with the production operation support module in the power restoration operation process of the primary equipment; and if relevant abnormity is monitored, outputting corresponding alarm information and pushing abnormal information. Intelligent risk prevention and control in the whole substation switching operation process are achieved, the substation switching operation quality and efficiency are improved, and field operation safety is guaranteed.

The present invention provides an electromagnetic noise analysis device that: is capable of performing electromagnetic noise analysis of an arbitrary observation point on a circuit during electromagnetic noise analysis, of a frequency axis, that takes into consideration various operation conditions, such as current dependency and control, which have conventionally been difficult to express except by using a time axis; and is capable of achieving both shortening of analysis time and improvement of analysis accuracy. The present invention is characterized by comprising: a noise spectrum analysis unit for executing frequency axis noise analysis in which each switch is expressed by a voltage source or a current source of the frequency axis for an arbitrary observation point of a power conversion circuit in which at least two switches are connected between power sources; a voltage source / current source noise source parameter generation unit for generating a parameter table for expressing a switching operation by a voltage source or a current source of the frequency axis, the switching operation corresponding to an operation condition including the power source voltage, the gate resistance of each switch, or a current; a worst condition extraction unit for extracting a current amount and a phase relationship in which a noise amount can be a worst condition during an operation on the time axis of each switch as based on control; and a worst condition noise source model generation unit for setting a noise source parameter for the worst condition using an extraction result by the worst condition extraction unit.