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

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 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.

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.

A submersible connector has releasably mateable first and second connector units. The first connector unit has at least one electrical pin extending through a bore in a retaining base and projecting outward from the forward end of the base. The second connector unit has at least one electrical socket module which receives a forward portion of the electrical pin when the units are mated. A pin seal device is located in one of the connector units and has a through bore which engages part of the pin at least in the mated condition of the units. The seal device has a first and second seals in sealing engagement with portions of the connector units when mated, and a chamber between the seals extends over an opposing portion of the pin at least in the mated condition of the units.

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.

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.

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.

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.

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.