117results about How to "Reduce electrical stress" patented technology

A stress cone for reducing electrical stresses is disclosed for use on terminated ends of tubing encapsulated power cable used in surface applications in a subsurface well power system employing electric submersible pumps (ESPs). The stress cone comprises an annular section about a longitudinal axis for receiving a terminated end of the TEPC in its first end and for abutting the terminated metal TEPC end against a metal shoulder at its second end therein, and an insulation chamber axially aligned with and connected to the annular section. The chamber comprises a metal interior surface symmetrical about the axis. The insulated TEPC core (without outer metal sheath) passes through the insulation chamber along the axis and then exits. The ID of the TEPC metal sheath and the inside metal surface of the chamber form a smooth ground plane transition surface. Insulation material surrounds the TEPC insulation layer within the insulation chamber.

A nonvolatile semiconductor memory includes a floating formation switch coupled to a bit line in a memory cell array. The floating formation switch maintains a channel voltage of memory cells coupled to the bit line at a level above a power supply voltage when the bit line is a non-selected bit line, which reduces electrical stress applied to the memory cells connected to the non-selected bit line during a read operation.

Embodiments relate to a method and system for power demand shaping (PDS) so as to manage power generation and use. Specific embodiments relate to data center power demand shaping to achieve high-performance low-overhead data center operation. Specific embodiments can incorporate standard (utility power) energy sources, renewable energy sources, or a combination of standard (utility power) energy sources and renewable energy sources. Embodiments of the subject PDS techniques can incorporate trimming the data center load power so as to allow DG systems to follow the power demand efficiently and / or incorporate two adaptive load tuning schemes that can boost data center performance and enable near-oracle operation during power demand trimming process. To implement a cross-layer power optimization scheme, embodiments of the subject invention relate to a power management module that can reside between front-end distributed generation and back-end computing facilities to provide a coordinated tuning between the supply and load.

An electrical connector may include a connector body having a passageway therethrough. The connector body may include a first layer adjacent the passageway, a second layer surrounding the first layer and comprising an insulative thermoplastic elastomer (TPE) material, and a third layer surrounding the second layer. The third layer preferably has a relatively low resistivity, and may also include a semiconductive TPE material. In some embodiments, the first layer may also include a semiconductive TPE material. The TPE material layers may be overmolded to thereby increase production speed and efficiency thereby lowering production costs. The TPE material may also provide excellent electrical performance and other advantages.

The invention discloses a symmetrical half-bridge LLC resonant bidirectional DC-DC converter, which belongs to the technical field of power electronic application. Topological structures on the two sides of the converter are symmetrical, and adopted components adopt a complex function design. When a switching network and a resonant network on one side of a high frequency transformer function, the switching network and the resonant network on the other side are automatically evolved into a rectifier-load network, and the networks on the two sides commonly form the whole LLC resonant converter to realize power conversion in a corresponding direction. Because the structures are completely symmetrical, reverse conversion can be possible; and in the reverse conversion, the topological structures can be automatically reconstructed to form a reverse LLC resonant converter to realize reverse power conversion. The symmetrical half-bridge LLC resonant bidirectional DC-DC converter achieves effective improvements in conversion efficiency, power density, dynamic performance and electromagnetic compatibility, reduces the electrical stress of components at work, has a reduced volume and a reduced weight, and realizes highly-efficient, isolated and bidirectional DC / DC power conversion.

Control circuitry handles inrush current, and may provide under voltage and / or over voltage monitoring and handling, as well as remote enable handling. The circuitry may advantageously employ a sense capacitor in parallel with an input capacitor (e.g., bulk input filter capacitor), and a current mirror to produce a signal proportional to input current. A clamp circuit may control a series pass device to regulate current in response to the proportional signal, or to interrupt current flow in response to an under voltage or over voltage condition or receipt of a signal indicative of a disable state. An enable signal may be summed into a comparator that handles under voltage condition determination.

Metal-oxide based memory devices and methods for operating and manufacturing such devices are described herein. A method for manufacturing a memory device as described herein comprises forming a metal-oxide memory element, and applying an activating energy to the metal-oxide memory element. In embodiments the activating energy can be applied by applying electrical and / or thermal energy to the metal-oxide material.

An LED driver circuit powers a plurality of LED arrays coupled in parallel, each LED array having one or more LEDs coupled in series. A power converter converts an input signal from a power source into an output signal across the LED arrays. A switching element is coupled in series with each of the LED arrays and alternates between first and second switch states in response to lighting control signals. A control circuit generates the lighting control signals and supplies them to the switching elements to sequentially operate one or more of the switching elements in the first switch state during each of a plurality of predetermined time periods in a light emitting state for the LED driver circuit.

Improved highly reliable power RFP structures and fabrication and operation processes. The structure includes plurality of localized dopant concentrated zones beneath the trenches of RFPs, either floating or extending and merging with the body layer of the MOSFET or connecting with the source layer through a region of vertical doped region. This local dopant zone decreases the minority carrier injection efficiency of the body diode of the device and alters the electric field distribution during the body diode reverse recovery.

An electrical connector may include a connector body having a passageway therethrough. The connector body may include a first layer adjacent the passageway, a second layer surrounding the first layer and comprising an insulative silicone elastomeric material, and a third layer surrounding the second layer. The third layer preferably has a relatively low resistivity, and may also include a semiconductive silicone elastomeric material. In some embodiments, the first layer may also include a semiconductive silicone elastomeric material. The silicone elastomeric material layers may be overmolded to thereby increase production speed and efficiency thereby lowering production costs. The silicone elastomeric material may also provide excellent electrical performance and other advantages.

A high voltage transformer including a transformer housing. Internal components and provided in the transformer housing. The internal components are submerged in transformer oil and are provided with insulation for insulating a high voltage winding end. The insulation includes a shield ring arranged above the winding end and a pressboard structure formed in a zigzag pattern arranged around the winding end. The shield ring includes a core covered with a conducting layer and a continuous solid insulation layer outside the conducting layer. The insulation layer includes integrated solid insulation sections of which at least some among themselves having varying thickness. Also a shield ring and a method of manufacture the shield ring.

A cooperatively controlled soft switch inverter type dual-wire pulse MIG arc welding power supply is composed of two power supplies for master and slave arc welders, two digitalized coordinate control modules for said arc welding power supplies, and the CAN bus between said two control modules. Said power supply consists of main circuit, external average current closed-loop control circuit and internal peak current closed-loop control circuit. Said external average current closed-loop control circuit comprises current and voltage detecting module, pulse parameters giving up module, comparator, single-chip control system, phase-shift PWM module and HF driver module.

The invention relates to a semiconductor illuminating lamp, in particular to a general high-efficiency long-life driving circuit for wide voltage non-inductance semiconductor illumination. According to the driving circuit disclosed by the invention, the traditional switching power supply and complex circuit topology of a PWM (Pulse Width Modulation) control mode are thoroughly changed, an output capacitor is charged and a load is powered by adopting directly-rectified commercial power, and the charging state of the output capacitor is controlled by utilizing the on-off of a field effect transistor; the on-off of the field effect transistor is controlled by a current flowing through the load so that the stability of an output current is ensured; a current of an LED (Light Emitting Diode) can be effectively controlled in an appropriate range so that the LED is prevented from being burned-out due to lightning effects of power transmission lines and affects of surge currents in switching on / off; and the driving circuit can be manufactured into a standard module, is suitable for large-scale industrialized production and has the advantages that the circuit design is ingenious, the whole circuit is very concise, the cost is low, no large-capacity capacitor is needed, the current stability is high, and the whole life is greatly prolonged, which can be close to the theoretical life about one hundred thousand hours of a semiconductor.

The invention discloses an alternating current-to-direct current circuit. The circuit comprises a rectification circuit, a BUCK circuit and a voltage detection control circuit, wherein the voltage detection control circuit is provided with a first preset valve used for limiting the lowest work voltage of the BUCK circuit and a second preset valve used for limiting the highest work voltage of the BUCK circuit, and is used for respectively detecting an instantaneous value of pulsating direct current and a voltage value of a low-voltage output end; the voltage detection control circuit outputs a PWM (pulse-width modulation) signal to control the BUCK circuit to work when the instantaneous value of the pulsating direct current is more than the preset vale and less than the second preset valve, and the output voltage Vout of the low voltage output end is less than a third preset value; and when the instantaneous value of the pulsating direct current is more than the second preset value, the voltage detection control circuit controls the BUCK circuit to stop working. The alternating current-to-direct current circuit has the advantages that the BUCK circuit works in a low voltage part of the pulsating direct current by limiting the highest work voltage of the BUCK circuit, so that the efficiency is improved, the circuit does not use high-voltage electrolytic capacitor, and the efficiency is high.

The invention discloses an MIG welding power supply system based on STM32. The MIG welding power supply system comprises an inversion main circuit and a control circuit. The inversion main circuit comprises an input rectifying filter module, a high-frequency inverting module, a power transformation module and an output rectifying filter module which are sequentially and electrically connected. The control circuit comprises an SMT32 digital control module, a voltage-current detecting module, a fault protecting module, a man-machine interface module and a high-frequency drive module. The man-machine interface module realizes welding parameter giving through a digital pulse encoder. The MIG welding power supply system has the advantages that an STM32 chip is used to control the pulse MIG welding power supply system, system structure is simple, the control function is achieved through software, high anti-interference capability is achieved, and the problems that traditional pulse MIG welding power supply system is complex in structure, large in size, and inaccurate in parameter giving, and the like are solved.

The invention provides a GOA circuit. Each level of GOA unit of the GOA circuit comprises a pull-up control module, an output module, a pull-down module, a first pull-down maintaining module and a second pull-down maintaining module. The gates of the thirty-second thin film transistor in the first pull-down maintaining module and the thirty-third thin film transistor in the second pull-down maintaining module are electrically connected with second and third nodes respectively. The sources all access a first low-potential signal. The drains all access a scan signal. The sources of the forty-second thin film transistor in the first pull-down maintaining module, the forty-third thin film transistor in the second pull-down maintaining module, and the forty-first thin film transistor in the pull-down module access a second low-potential signal. The potential of the first low-potential signal is greater than the potential of the second low-potential signal. The potential of the second low-potential signal is greater than the low potential of a clock signal. The falling time of the scan signal is shortened, and at the same time the electrical stress of the thin film transistor in the pull-down module can be reduced.

Control circuitry handles inrush current, and may provide under voltage and / or over voltage monitoring and handling, as well as remote enable handling. The circuitry may advantageously employ a sense capacitor in parallel with an input capacitor (e.g., bulk input filter capacitor), and a current mirror to produce a signal proportional to input current. A clamp circuit may control a series pass device to regulate current in response to the proportional signal, or to interrupt current flow in response to an under voltage or over voltage condition or receipt of a signal indicative of a disable state. An enable signal may be summed into a comparator that handles under voltage condition determination.

At least a laminate of a gate insulating film 6 and a gate electrode 7 and an active region 13 are formed on a silicon substrate 1, and an underlying interlayer insulating film 10 is further formed. Then, a conductor 11a connected to the gate electrode 7, and a conductor 11b that is a dummy conductor and is connected to the active region 13 are formed simultaneously on the underlying interlayer insulating film 10. Thereafter, an interlayer insulating film 12 is formed on the underlying interlayer insulating film 10 by a plasma process. At this time, charging current from a plasma 14 is emitted through the conductor 11b, which is a dummy conductor.

The invention discloses an asymmetric boost unit based cascaded boost converter. Primary and secondary windings are used repeatedly, and asymmetric boost units are fused, so that the boost capabilityof the converter is improved greatly; two capacitors and one diode form a novel clamp circuit, energy of a leakage inductor is absorbed effectively, and the efficiency of the converter is improved; and the two capacitors are connected in series to reduce the voltage stress of an output rectifier diode effectively. Three diodes realize zero-current ON, and one diode realizes zero-current OFF.

The invention discloses an isolated gate bipolar transistor driving circuit comprising a transformer (1), and a primary side of the transformer (1) is used for receiving pulse width modulation signals. The invention is characterized by also comprising a charge-discharge module (2), wherein, a secondary side of the transformer (1) is used for connecting a gate pole of an isolated gate bipolar transistor, and is connected with the input end of the charge-discharge module (2); the output end of the charge-discharge module (2) is used for connecting with the gate pole of the isolated gate bipolartransistor; the charge-discharge module (2) is used for receiving the pulse width modulation signals output by the secondary side of the transformer (1), and charges or discharges to the isolated gatebipolar transistor according to the pulse width modulation signals to lead the isolated gate bipolar transistor to be precharged before power on and to be predischarged before power off. The drivingcircuit can effectively inhabit power on of instantaneous current di / dt and power off of instantaneous voltage dv / dt so as to achieve the purpose of reducing the electric stress of the isolated gate bipolar transistor.

The invention discloses a method and a device for improving reliability of a digital PFC (Power Factor Correction) circuit. The method comprises a Bus over voltage protection strategy, a PFC inductor over current protection strategy and a PFC inductor current reducing strategy. The Bus over voltage protection strategy adopts a secondary protection mode; the PFC inductor over current protection strategy adopts a pulse-by-pulse current limiting protection strategy; and the PFC inductor current reducing strategy adopts a strategy of reducing a pulse-by-pulse current limiting point in the pulse-by-pulse case and zeroing a loop intermediate variable when an inductor current reference value is larger than a specific value. The device of the invention is corresponding to the method. On the premise of ensuring the normal operation of a rectifier at a steady state, Bus over voltage and inductor over current can be timely protected, the electric stress of the PFC device can be significantly reduced in the case of dynamic input and output switching, and the reliability of the rectifier power device is improved.

The invention relates to the technical field of welding equipment, in particular to a thin double-wire digital soft switch inverter welding power source system and a control method thereof. The system comprises over-voltage under-voltage protection and detection circuits placed in the same welding power source case by adopting an integrated structure, a man-machine interaction system, an ARM master controller in which a welding process expert database software system is placed, two limited bipolar soft switch full-bridge inverter main circuits with the same structure, and two drive and detection circuits with the same structure, wherein the limited bipolar soft switch full-bridge inverter main circuits take insulated gate bipolar transistors (IGBT) as switching elements. The system can improve the welding efficiency on the premise of ensuring the welding quality and the welding stability, effectively reduce the influence of electromagnetic interference of a welding site and eliminate mutual electromagnetic interference between two welding wires, has high safety performance, can reduce equipment volume and lower equipment cost, and is comparatively energy-saving.

The invention discloses a loop current inhibition method suitable for a modular multilevel converter. The loop current inhibition method includes that loop current inside the modular multilevel converter (MMC) is separated from detected bridge arm current through frequency-doubled negative sequence rotation coordinate conversion, and a cross coupling novel control mode is adopted to realize quick inhibition of frequency-doubled loop current inside the MMC, so that capacitor voltage fluctuation of an MMC submodule can be effectively reduced, and stability and overall running performance of an MMC system can be improved.

A bidirectional transmission convertor suitable for a high voltage and a high power, comprising a power module. The power module comprises a high-frequency transformer and modules of a full-bridge topological structure which are respectively connected to each phase of the primary side and the secondary side of the high-frequency transformer, wherein the modules of the full-bridge topological structure which are respectively connected to each phase of the primary side and the secondary side respectively comprise four modules SMp and four modules SMs, each bridge arm of the modules of the full-bridge topological structure which are connected to each phase of the primary side is respectively provided with one module SMp, and each bridge arm of the modules of the full-bridge topological structure which are connected to each phase of the secondary side is respectively provided with one module SMs. The convertor reduces the switching frequency and the switching loss of a power tube, reduces the electrical stress borne by a single tube, and improves the waveform quality of an alternating current link.

This invention relates to a storage battery control device of a micro-gas turbine composed of a power commutation circuit and a control system, in which, the power commutatuin circuit is the power commutation and filter circuit, the control system includes a multiple power control module, a multiple data test and collection module, a central control module, a step communication alarm module and a charge and discharge control module of batteries, the power commutation and filter circuit is connected with the multi-power drive module, the multiple data test and collection module are connected with the two poles of the voltage of the battery and the DC bus, the multi-power drive module is connected with the charge-discharge control module, the central control module is connected with the charge-discharge control module, the multiple data test and collection module and the step communication alarm module, which is used in a micro-gas turbine generation system.

The invention discloses a staggered parallel high-stability modularized direct-current current-stabilized power supply system, which belongs to the technical field of variable flow in the power industry. The conventional redundancy technology for a voltage type power supply system is applied to a current type power supply system. The conventional staggered parallel connection technology is improved and applied to a current type power supply system. Self-verification synchronization technology is adopted, so that correct transceiving of each module of the system can be ensured, the influence of transmission time delay of the system on a synchronizing signal is minimized, each module of the system can receive the synchronizing signal and staggered parallel connection of the system is realized truly. When a plurality of power supply modules run in parallel, output total current can reach thousands accuracy effect, the size of a filtering device is reduced and transient response characteristic of the system is enhanced.