摘要:
A power inverter control device is designed to control a neutral point clamped power inverter apparatus including first to fourth self-extinction elements sequentially connected in series between two end terminals of a power supply having an intermediate terminal, four freewheeling diodes connected in parallel with the self-extinction elements in a direction opposite thereto, a series circuit of first and second clamping diodes, connected in parallel with a series circuit of the second and third self-extinction elements in a direction opposite thereto and having a node connected to the intermediate terminal of the power supply. The control device includes a circuit for generating a first PWM control signal having a pulse width corresponding to a load current, and a PWM control circuit for converting the first PWM control signal into a second PWM control signal having a pulse width equivalent to the sum of the pulse width of the first PWM control signal and a width corresponding to one of turn-on and turn-off periods of each of the self-extinction element, and supplying the second PWM control signal to the first to fourth self-extinction elements.
摘要:
A wire laying apparatus comprising a first carrier member, a second carrier member having one end connected to the first carrier member, a communication wire disposed within the second carrier member, and a compressor connected to and supplying a fluid under pressure to a second end of the second carrier member through which the fluid supplied by the compressor serves to move the communication wire from the second carrier member to the first carrier member. The wire laying apparatus may be restructured to serve as a wire collecting apparatus.
摘要:
A slip frequency type vector control apparatus for an induction machine which is provided with first and second feedback circuits for correcting respective magnetization current command and torque current command supplied feed-forwardly so as to eliminate the influence of a change in temperature of the induction machine secondary resistance and realize a correct vector control.
摘要:
In a semiconductor device of the present invention, partial products of a multiplicand and a specific bit of a multiplier are formed by a plurality of partial product producing circuits. The results of multiplication obtained from the partial product producing circuits are output to one of full adders serving as first partial sum producing circuits through a first connection wire formed of a first metal wiring layer and a second metal wiring layer formed above the first layer. In the first full adders, specific bits of the partial product producing circuits are grouped for addition. The result of this addition is output to a second full adder through a second connection wire formed of a third metal wiring layer formed above the second layer. In the second full adder, the results of addition obtained from the first full adders are added together, and then the result obtained from the second full adder is output to other full adders and a final full adder to obtain the product of the multiplicand and the multiplier.
摘要:
In an integrated circuit device such as a logic LSI having a row structure, each row includes a group of logic elements and a clock driver. The clock driver in each row is arranged at one end of the row so as to shorten the distances from the clock driver to a primary power supply wiring and a primary ground wiring.
摘要:
In an integrataed circuit device such as a logic LSI having a row structure, each row includes a group of logic elements and a clock driver. Each clock driver is connected to a clock signal input wiring, a primary power supply wiring, and a primary ground wiring. The output terminals of the clock drivers in the rows are short-circuited by a clock signal output short-circuiting wiring.
摘要:
A method for producing a glass preform for use in fabrication of an optical fiber, which comprises steps of forming a cylindrical rod of glass having a refractive index distribution with axial symmetry around the rod axis by an VAD method, stretching the rod glass to decrease its diameter, inserting the stretched rod in a glass tube having a refractive index distribution with axial symmetry around the tube axis and heating and melting a complex of the stretched rod and the tube to integrate them from the glass preform produced by the method, an optical fiber having precisely controlled refractive index distribution can be fabricated.
摘要:
A high voltage power cable assembly for applying rectangular high voltage pulses to an X-ray tube of an X-ray diagnostic apparatus, including two conducting lines formed of a plurality of stranded or twisted wires covered with insulating layers, two conductors including a plurality of stranded or twisted wires arranged in opposition to a contact point of the conduct lines, the conductors having opposite ends connected to each other, a semi-conductive layer enclosing the conducting lines and the conductors, an insulating layer covering the semi-conductive layer, a shield layer covering the insulating layer, and a sheath wrapping the shield layer.
摘要:
Power is fed to a plurality of loads by a respective plurality of circulating current type cycloconverters connected to an ac power supply. A power compensating capacitor common to the cycloconverters is provided at the ac power receiving-end to deliver a leading reactive power to the ac power supply. Further, each cycloconverter is provided with means for delivering a circulating current and means for delivering a circulating current command value to the circulating current control means. A lagging reactive power corresponding to the leading reactive power by the power factor compensating capacitor is delivered to the ac power supply. The power factor compensating capacitor may be configured so that its capacity is variable by changing the number of stages connected. In addition, the circulating current command value may vary depending upon the peak value of the current flowing in each cycloconverter.
摘要:
An improved method and apparatus for assembling fastening elements to fabric pieces including sewing separated fastener stringer tapes to respective fabric pieces pulling the sewn element downstream as the sewing proceeds, and partially combining the separated stringer tapes by pulling the slider downstream through a portion of the length of the fastener elements while retarding movement of the stringer tapes at their upstream ends.