40results about How to "Reduce transient current" patented technology

A power control system is disclosed for controlling the power supplied to a lighting system and limiting power during time of peak demands and the like wherein the lighting system includes a power source and a lighting load connected to the power source. The control system comprises a main transformer having a first winding and a second winding, the first winding being connected between the power source and the lighting load. An autotransformer connected to the power source having a plurality of electrical transformer taps with prescribed voltage values. A plurality of solid-state tap switches is connected to the transformer taps and to the second winding of the main transformer to apply the prescribed voltage values across the second winding. A system controller has an input for receiving a voltage change signal representing a selected load voltage to be applied to the lighting load. The controller is connected to the tap switches for selectively closing one of the tap switches to produce said prescribed voltage value across the second winding of the main transformer whereby the selected load voltage is output across the first winding of the main transformer and applied to the lighting load without interruption of the lighting. A transient control circuit is connected across an output of the tap switches for dissipating transient currents during switching of tap switches.

The invention discloses a cell discharge overcurrent protection circuit and a cell discharge overcurrent protection method. The overcurrent protection circuit comprises a discharge switch tube, a discharge control module used for detecting discharge current of a cell in real time and a time-delay module used for determining whether overcurrent timeout occurs by comparing time of overcurrent generation with the preset time-delay time. Whether overcurrent occurs is determined by comparing the detected discharge current with a preset threshold, if the overcurrent does not occur, the discharge switch tube is controlled to open; if the overcurrent occurs, and the overcurrent timeout occurs, the discharge switch tube is locked in a turn-off state. Through enforcement of the technical scheme, when a load is connected with the cell, the transient current during cell discharge can be reduced, transient energy during cell discharge is effectively restricted, and safety of the cell is improved.

The invention discloses a soft start device and method. The soft start device and method are suitable for voltage regulators, especially for non-capacitive voltage regulators. According to the device, a power-on current control module is additionally arranged on the basis of an existing voltage regulator circuit, and used for detecting a power connection end and controlling a power tube of a voltage regulator to be conducted and connected to a power supply after a preset time when detecting that power input exists at the power connection end. According to the corresponding method, the power tube is controlled to be conducted and connected to the power supply after the preset time when the power input end is detected. According to the soft start device and method, voltage overshoot and surge current in the fast power-on process from the time when the power supply is turned on to the time when the power tube is connected to the power supply are eliminated, and the circuit is protected.

A nonvolatile semiconductor storage device provided with a highly integrated memory cell array wherein consumption current increase caused by a transient current due to potential change of a bit line and a word line is suppressed during shifts among modes of reading, writing and erasing. A two-terminal memory cell is provided with a variable resistance element whose resistance value reversibly changes by pulse application. In the memory cell array (1), a plurality of two-terminal memory cells are arranged in a row direction and a column direction, respectively, and ends on one side of the memory cells on a same row are connected to common word lines (WL1-WLn), and the other ends of the memory cells on a same column are connected to common bit lines (BL1-BLm). While the operation of reading, writing and erasing are performed to a selective memory cell, a common nonselective voltage VWE / 2 is applied to both a nonselective word line and a nonselective bit line not connected to the selective memory cell.

The invention discloses a shifting register unit and a grid drive circuit as well as a display device. The shifting register unit comprises an input module, a processing module and an output module, wherein the input module is used for inputting a first clock signal, a second clock signal, a frame start signal, a high-voltage signal and a low-voltage signal; the processing module is connected with the input module and comprises a plurality of thin film transistors; the processing module is used for generating grid drive signals according to the first clock signal, the second clock signal and the frame start signal, controlling that the voltage of first nodes formed by the thin film transistors at an evaluation phase of the shifting register unit is lower than a lower level of a power supply signal, controlling second nodes formed by the thin film transistors to be reset, and cutting off a transient direct-current path formed by the input end of the high-voltage signal, the input end of the low-voltage signal and at least one thin film transistor in time; and the output module is connected with the processing module and is used for sending out the grid drive signals generated by the processing module. According to the invention, the transient current is reduced and the power consumption of the shifting register unit is reduced.

The invention discloses a soft start device and method. The soft start device and method are suitable for voltage regulators, especially for non-capacitive voltage regulators. According to the device, a voltage buildup and speed control module is additionally arranged on the basis of an existing voltage regulator circuit and used for controlling the output voltage of an error amplifier, and therefore the output voltage of the voltage regulator circuit can rise to a stable value at a preset speed in the circuit establishment process. According to the corresponding method, the output voltage of the voltage regulator circuit rises to the stable value at the preset speed. Due to the adoption of the scheme, voltage and current impact caused after a power tube is conducted is avoided, and transient current generated in the establishment process of a loop working point is reduced.

The invention relates to a method, a storage medium and equipment for controlling a motor. The method comprises steps as follows: (1) determining a negative voltage component to be applied to an alphaaxis and a beta axis of the motor, wherein the alpha axis and the beta axis are two-phase stationary axes corresponding to three-phase axes of the motor; (2) calculating a PWM (pulse width modulation) signal used for controlling an inverter on the basis of the negative voltage component, wherein the inverter is used for providing three-phase alternating current for the motor; (3) applying the PWMsignal to the inverter; (4) after preset time, performing active short-circuiting operation on the motor. Compared with the prior art, the negative control voltage component is applied to the motor,one virtual resistor is added to a resistor of the motor equivalently, and transient current in an active short-circuiting circuit of the motor is accurately and timely reduced without motor rotor position information.

A high-withstand-voltage normally-on transistor (T1) and a low-withstand-voltage normally-off transistor (T1) are connected in series, and diodes (D1,D2) are provided in reverse parallel to the transistor (T2). A gate terminal of the transistor (T1) is connected to a source terminal of the transistor (T2), and a gate driving circuit (11) that outputs a control signal to a gate terminal of the transistor (T2) is provided. Forward voltage of the diode (D2) is made lower than forward voltage of the diode (D1), and an inductance component of a path connecting nodes (N1) (N3)via the diode (D1) is made greater than an inductance component of a path connecting the nodes (N2) (N3) via the diode (D1). Accordingly, a switching circuit which includes transistors connected in series and in which transient current at a time of turning off is reduced is provided.

A level shifter consists of the first set and the second set of circuits. It is featured as forming each set of circuit by a switch circuit and two MOS tubes, connecting source electrode of the second MOS tube to the second power supply, controlling on-off of switch circuit by input signal based on the first power supply and outputting an output signal based on the second power supply by the first MOS tube in the first set circuit after drain electrode of said first MOS tube is phase-inversed.

The invention discloses a high-conductivity FeSiAl magnetic powder core and preparation method for the same. The high-conductivity FeSiAl has raw material of FeSiAl aluminum alloy powder particles. The preparation method comprises the following steps of 1) dehumidifying and coating the FeSiAl aluminum alloy powder particles,2) coiling the magnetic core material by a metal soft magnetic belt and heating, 3) preparing a FeSiAl magnetic powder core crude products, 4) preparing a FeSiAl magnetic powder core processed products, and 5) preparing a FeSiAl magnetic powder core products. Compared with the present magnetic core preparation method, large current transient loss can be reduced and transient resistance can be improved; large current instant on-off soft landing can be achieved and electric equipment can be protected; and power supply power factors can be improved.

The invention proposes a half-cell structure of a gate power MOSFET anti-single-particle-burnout device. According to the structure, an N-type buffer layer with an N-type local doped region is manufactured in the drain (cathode) electrode region of a semiconductor power device, which can significantly reduce the electric field peak and impact ionization degree of a semiconductor power device driftregion and high and low junctions of a substrate. The number of carriers generated by avalanche multiplication caused by impact ionization can be reduced. The transient current acting on a parasiticbipolar transistor is greatly reduced, so that the parasitic bipolar transistor is difficultly turned on. The device's ability to resist single particle burnout can be improved without sacrificing basic electrical characteristics.

The invention discloses a preparation method of novel amorphous magnetic powder core. Amorphous alloy powder particles are used as a raw material. The preparation method is characterized by comprising the following steps of 1) pre-processing the amorphous alloy powder particles; 2) performing thermal treatment on a metal soft magnetic strip; 3) preparing a first product of the amorphous magnetic powder core; 4) preparing a processed product of the amorphous magnetic powder core; and 5) preparing the novel amorphous magnetic powder core. The preparation method is used for preparing the magnetic core; and compared with an existing method for preparing the magnetic core, the preparation method has the advantages that the transient loss of a large current is reduced, transient impedance is improved, effects of instantaneous on / off of the large current and soft landing are achieved, power utilization equipment is protected, and a power factor of a power supply is improved.

A voltage level shifter including a voltage level shifting circuit and a boost circuit is provided. The voltage level shifting circuit includes a first reference input end, a second reference input end, a first boosted input end, and a second boosted input end. The voltage level shifting circuit operates between a first voltage and a second voltage. The boost circuit is coupled to the voltage level shifting circuit. The boost circuit boosts the first boosted input end and the second boosted input end according to voltage values of the first reference input end and the second reference input end to reduce a transient current that flows from the first voltage to the second voltage.

The invention relates to a circuit for lowering CMOS transient power consumption, comprising a CMOS gate circuit composed of a PMOS transistor and an NMOS transistor, wherein the source electrode of the NMOS transistor is accessed to a power supply level; a barrier device is inserted between a base electrode and a power supply of the PMOS transistor of the pull-up network of a gate circuit to isolate the base electrode from the power supply end; and a voltage regulator is added on the base electrode to enable the voltage value of the base electrode to be constant in a certain range. Thus, in the process of switching input signals of the gate circuit, feed-through current flowing from the power supply to an input end via the base electrode is avoided, thus lowering transient power consumption of a CMOS integrated circuit, and ensuring the base electrode level to be unchangeable without influencing operation of the logic gate circuit due to the voltage regulator.

A logic device with low electromagnetic interference. The logic device includes a digital logic gate, a voltage-limited circuit and a current-limited circuit. The digital logic gate provides a corresponding digital logic function. The voltage-limited circuit is connected to the digital logic gate in order to provide a fixed voltage to the digital logic gate to thus reduce an output voltage swing of the digital logic gate. The current-limited circuit is connected to the digital logic gate in order to provide a fixed current to the digital logic gate to thus reduce a transient current of the digital logic gate. Accordingly, an electromagnetic interface (EMI) caused by switching of the digital logic gate is reduced with the reduced output voltage swing and transient current.

The invention discloses a soft start device and method, which are suitable for voltage regulators, especially capacitorless voltage regulators. The device adds a power-on current control module on the basis of the existing voltage regulator circuit. The power-on current control module is used to detect the power input end, and when it is detected that the power input end has a power input, control the voltage The power tube of the regulator is turned on and connected to the power supply after a predetermined time; the corresponding method is to control the power tube to be connected to the power supply after a predetermined time after detecting the power access terminal; the device and method are The period from power on to power tube access to power supply eliminates voltage overshoot and surge current during fast power-on, and protects the circuit.

The invention discloses a synchronous motor parameter test and measurement method. The method comprises steps: when the motor is stationary and an excitation winding is short-circuited, the same DC step voltage signals are applied between different two phases of an armature end in turn, the armature current of the motor during a transient process is recorded, and corresponding armature current response signals are acquired; motor d-axis and q-axis DC step voltage signals are used to obtain the time domain general solution form of the armature current response of a rotor at any position; the time domain general solution form of the armature current response is used to fit the acquired armature current response signals, and the fit armature current response signals are converted to a frequency domain expression; and according to the frequency domain expression of each armature current response signal and the DC step voltage signal, the impedance expression of each frequency domain of themotor, motor d-axis and q-axis frequency domain operation inductance and each-step inductance and time constant are calculated. All parameters in the d and q-axis equivalent circuit of the synchronous motor can be measured simultaneously under the operation without rotor positioning.

A transient current in a rectifier circuit is effectively reduced. In a rectifier circuit, a first rectifier is provided between a first terminal and a second terminal. In the rectifier circuit, when a switch element is turned ON, a primary winding current flows from a power supply to a primary winding of a transformer. When the switch element is turned OFF, a second rectifier current flows from a secondary winding of the transformer to a second rectifier. During a period in which the second rectifier current is flowing, a reverse voltage is applied between the first terminal and the second terminal.

A bus sensor comprises a main power supply (1), a core power supply (3), an auxiliary power supply (4), a communication power supply (5), a core processing circuit (6), a display circuit (7), a sensing module circuit (8) and a communication circuit (9), wherein the main power supply (1) supplies power to the core power supply (3), the auxiliary power supply (4) and the communication power supply (5), the core power supply (3) maintains continuous power supply, the core power supply (3) is connected with the core processing circuit (6), and the core processing circuit (6) enters a dormant statewhen not working. According to the invention, independent power supply control is added to other parts of the sensors except the core circuit, so that the sensors are powered off, and the transient current when the plurality of sensors are powered on and started is reduced by starting the sensors in a time-sharing manner, so that the number of the sensors connected with the bus can be increased.

The invention relates to FET-bipolar transistor combination. A transistor switch device is provided that exhibits relatively good voltage capability and relatively easy drive requirements to turn the device on and off. This can reduce transient drive current flows that may perturb other components.

The present disclosure relates to FET-bipolar transistor combinations. A transistor switching device is provided which exhibits relatively good voltage capability and relatively easy drive requirements to turn the device on and off. This reduces transient drive currents that can upset other components.

A level shifter consists of the first set and the second set of circuits. It is featured as forming each set of circuit by a switch circuit and two MOS tubes, connecting source electrode of the second MOS tube to the second power supply, controlling on-off of switch circuit by input signal based on the first power supply and outputting an output signal based on the second power supply by the first MOS tube in the first set circuit after drain electrode of said first MOS tube is phase-inversed.

The present invention provides a high withstand voltage on-line measurement circuit and system for the conduction voltage drop of power semiconductor devices, including a withstand voltage circuit and a clamping circuit, one end of the withstand voltage circuit is connected to one end of the clamping circuit, the withstand voltage circuit and the The other end of the clamping circuit is respectively connected to any one of the two ends of the power semiconductor device under test. The withstand voltage circuit is composed of several withstand voltage units and a current limiting circuit. The two ends of the clamping circuit are the output terminals of the measuring circuit. The clamping voltage of the bit circuit is higher than the turn-on voltage drop of the power semiconductor device under test. When the power semiconductor device under test is turned off, the clamp circuit plays a clamping role; when the power semiconductor device under test is turned on, the clamp circuit The clamping effect fails. The present invention realizes the substantial improvement of the withstand voltage level of the measurement circuit through the series voltage division of multiple withstand voltage units, and can improve the transient performance of the measurement system by adjusting the device parameters in the current limiting circuit and the clamping circuit, and the measurement is accurate and applicable. wide and low cost.

The invention discloses a soft start device and method. The soft start device and method are suitable for voltage regulators, especially for non-capacitive voltage regulators. According to the device, a voltage buildup and speed control module is additionally arranged on the basis of an existing voltage regulator circuit and used for controlling the output voltage of an error amplifier, and therefore the output voltage of the voltage regulator circuit can rise to a stable value at a preset speed in the circuit establishment process. According to the corresponding method, the output voltage of the voltage regulator circuit rises to the stable value at the preset speed. Due to the adoption of the scheme, voltage and current impact caused after a power tube is conducted is avoided, and transient current generated in the establishment process of a loop working point is reduced.

The invention provides a CAM circuit structure with low power consumption and high capacity. The existing CAM circuit structure is changed, the working process of the large-capacity CAM is divided into several pipeline stages, searching, addressing and latching are sequentially carried out in a partition mode, finally, all addressing results are coded in a unified mode, and then result addresses are generated and output, so that the transient large power consumption of the CAM is distributed in the multiple pipeline stages, and the instantaneous high current requirement on a chip power supply network is reduced. The structure has important application value in the large-scale low-power SoC using the CAM IP.

The present disclosure provides a composite start-stop device and a control method for a critical DC lubricating oil pump of a steam turbine, comprising a main contact module, a buck circuit and a current limiting module connected in sequence, and the main contact module is configured to cut off or connect two DC The buck circuit includes three parts, the first part is the parallel structure of the DC contactor and the power electronic switch, and the parallel structure is connected to a certain DC bus, and the second part is the fuse and the power electronic switch. Freewheeling diode series structure, the series structure is located on one side of the parallel structure, and is connected between two DC bus bars; the third part is the bus capacitor, which is arranged on the other side of the parallel structure and connected to the Between two DC buses; the current limiting module is set on one of the DC buses to limit the current for the load to be connected. The present disclosure not only has the advantages of smooth start-stop of the buck conversion DC motor start-stop device, but also greatly improves the anti-overload capability of the IGBT and the freewheeling diode.

The present invention effectively reduces a transient current in a rectifier circuit. A rectifier circuit (1) has a first rectifier element (FR1) provided between a first terminal (FT1) and a second terminal (ST1). In the rectifier circuit (1), if a switch element (TT1) is on, a primary winding current flows from a power supply (TP1) to a primary winding (PW1) of a transformer (TR1). If the switchelement (TT1) is off, a second rectifier element current flows from a secondary winding (SW1) of the transformer (TR1) to a second rectifier element (SR1). During a period in which the second rectifier element current is flowing, reverse voltage is applied between the first terminal (FT1) and the second terminal (ST1).

The invention discloses a high-conductivity FeSiAl magnetic powder core and preparation method for the same. The high-conductivity FeSiAl has raw material of FeSiAl aluminum alloy powder particles. The preparation method comprises the following steps of 1) dehumidifying and coating the FeSiAl aluminum alloy powder particles,2) coiling the magnetic core material by a metal soft magnetic belt and heating, 3) preparing a FeSiAl magnetic powder core crude products, 4) preparing a FeSiAl magnetic powder core processed products, and 5) preparing a FeSiAl magnetic powder core products. Compared with the present magnetic core preparation method, large current transient loss can be reduced and transient resistance can be improved; large current instant on-off soft landing can be achieved and electric equipment can be protected; and power supply power factors can be improved.