39results about How to "Reduce transient current" patented technology

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.

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 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.

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 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.

The invention discloses a power device anti-single event burning reinforced structure electrode and a preparation method thereof. An N-type multi-buffer layer structure is arranged in the drain electrode region of a semiconductor power device; a groove is formed at the source electrode and the neck region electrode and A metal electrode is formed; an integrated transistor is arranged under the neck region; an N-type field stop layer is arranged between the P-type body region and the drift region. Adopting the technical scheme of the present invention can greatly reduce the electric field peak value and impact ionization at the drift region of the semiconductor power device and the substrate homojunction, and reduce the number of carriers generated by the avalanche multiplication caused by the impact ionization; The current density is greatly reduced, thereby reducing the heat generated by the thermal effect of the current, and the SEB safe working voltage of the device is significantly improved.

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 objective of the present invention is to reduce a transient current effectively in a rectifier circuit. In a rectifier circuit (1), a first rectifying element (FR1) is provided between a first terminal (FT1) and a second terminal (ST1). In the rectifier circuit (1), a primary winding current flows from a power source (TP1) through a primary winding (PW1) of a transformer (TR1) when a switch element (TT1) is turned on. When the switch element (TT1) is turned off, a second rectifying element current flows from a secondary winding (SW1) of the transformer (TR1) through a second rectifying element (SR1). By causing the second rectifying element current to flow, a first reverse voltage, which is an instantaneous reverse voltage, is applied between the first terminal (FT1) and the second terminal (ST1).

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.

The invention provides a cable routing box for an intelligent electronic device of a substation. A plurality of metal ends grounded nearby in multiple modes are arranged on the outer wall of a box body of the routing box, a metal groove is formed in each of two side walls of the box body, a shielding reed is arranged in each metal groove, and two side walls of an upper cover plate are paint-free naked metal. Compared with the prior art, the cable routing box for an intelligent electronic device of a substation obviously weakens the direct influence of transient enclosure voltage rise in a distributed grounding mode, greatly reduces transient current excited thereon, and then reduces disturbance voltage induced on internal cables; the routing box is easy to install and maintain to special structural design of the box body, and the shielding effect of the cable routing box is improved while the influence of enclosure ground potential rise of a GIS (Gas Insulated Switchgear) on the cable of the intelligent electronic device is reduced.