49results about How to "Eliminate dead time" patented technology

By adding silica to ceria-based CMP slurries the polish process starts much faster than without silica thereby eliminating dead time in the polish process and eliminating process instability caused by changes in the dead time with operating conditions. A slurry for performing chemical mechanical polishing (CMP) of patterned oxides (e.g., STI, PMD, ILD) on a substrate, comprises: ceria particles having a concentration of 1.0–5.0 wt % and silica particles having a concentration of 0.1–5.0 wt %. A ratio of ceria concentration to silica concentration (ceria:silica) is from approximately 10:1 to nearly 1:1 by weight. The ceria particles have a particle size of 150–250 nm, and the silica particles have a particle size of greater than 100 nm. The silica may be fumed or colloidal. The slurry has a pH of approximately 9.0.

A digital / analog amplifier includes the following coupled in series: a pulse-width modulator, a control circuit, a power inverter and a filter. The power inverter comprises two transistors series-connected between a power supply terminal and a ground of the amplifier. The control circuit drives the transistors of the power inverter. One output of the filter forms an output of the amplifier to which a load is connected. The amplifier also comprises a capacitive circuit parallel-connected to the output of the power inverter.

An apparatus is provided to control the weight of fabric produced by a textile machine (2), comprising weighting means of every single fabric piece directly associated to the textile machine dedicated to the manufacture of the same. A procedure is also provided to control the weight of the fabric produced by a textile machine, comprising a weighting stage of every single fabric wounded or folded, near the textile machine dedicated to the manufacture of said piece, and to apply to every manufactured piece a printed label suitable to provide at least specific data concerning the piece weight.

A safety control system for an electromagnetic door lock of an electric household appliance, wherein a blocking pawl is controlled by the movement of a core of an electromagnet, including a supplying circuit of a coil of the electromagnet, power supplying means to supply electric pulses in the circuit for energizing the coil and a PTC element arranged in series in the circuit; wherein power supplying means are of the type adapted to generate first pulses for taking the pawl to a blocking position and second pulses, having a polarity opposite to the first, for taking the pawl to a releasing position; and including means for determining, according to the parameters of an operating cycle of the electric household appliance, the emission of at least one train of first pulses by the power supplying means, so as to produce the heating of the PTC element.

A timepiece includes a chime mechanism (1) having an hours component (2), a quarters component (4) and a minutes component (6), the hours (2), quarters (4) and minutes (6) components being pivot-mounted about one and the same spindle (3), the quarters component (4) and the minutes component (6) being kinematically linked by a first driving member collaborating with a first driving toothset (34). Out of the hours component (2) and the quarters component (4), one includes a second driving toothset (21) and the other includes a second driving member designed to be capable of collaborating with the second driving toothset (21) and of kinematically linking the hours component (2) and the quarters component (4), thereby eliminating the dead time between the chimes for the hours and those for the quarters, or between those for the hours and those for the minutes when there isn't a quarter to chime.

The invention relates to a Z-source three-level PWM (pulse width modulation) rectifier and a method for controlling the same. The Z-source three-level PWM rectifier comprises three phases of bridge arms which are connected with one another in parallel. Each phase of bridge arm comprises four switch tubes which are serially connected with one another, and middle points of the various phases of bridge arms are connected with power grids or alternating-current sources by inductors to be used as input sources of the rectifier; output ends of the various bridge arms which are connected with one another in parallel are connected with an input end of a Z-source network; the switch tubes S<W1> and S<W2> are respectively serially connected to the upper side and the lower side of an output end of the Z-source network; a rear output end of the Z-source network is connected with a serial connection branch of a capacitor C1 and a capacitor C2 in parallel, and the serial connection branch of the capacitor C1 and the capacitor C2 is connected with a direct-current load. The Z-source three-level PWM rectifier and the method have the advantages that reduced voltages can be outputted by the Z-source three-level PWM rectifier with the topology, the upper and lower bridge arms can be directly connected with one another, the reliability can be obviously improved, dead time can be eliminated, and waveform distortion can be prevented; alternating-current harmonic voltages and currents can be effectively reduced by the Z-source three-level PWM rectifier while withstand voltage level can be upgraded, the quality of network-side waveforms of the Z-source three-level PWM rectifier can be improved in identical switch frequency and control modes, and distortion can be decreased.