361results about How to "Reduce dead time" patented technology

The present invention proposes a new structure for a high input VRM. This structure is similar to a simple buck converter and can simplify the 48V input VRM design. In this present invention, the interleaved voltage regulator is provided. The interleaved voltage regulator includes an integrated magnetic device for performing both transformer and output choke filter function, a first switch, a second switch, a third switch, and a fourth switch, wherein the integrated magnetic device includes a transformer having a first primary winding, a second primary winding, a first secondary winding, and a second secondary winding, a first choke filter having one end coupled to a first terminal of the first secondary winding, and a second choke filter having one end coupled to a first terminal of the second secondary winding, and the other end of the second choke filter coupled to the other end of the first choke filter to form the output terminal of the isolated voltage regulator. The first switch, the second switch, the first choke filter, and the first secondary winding form a synchronous rectifier circuit. The third switch, the fourth switch, the second choke filter, and the second secondary winding form another synchronous rectifier circuit.

The invention relates to an energy saving system of a belt conveyor and an energy-saving control method of the energy saving system of the belt conveyor. The energy saving system of the belt conveyor comprises a system starting button, a belt conveyer, a material detection device, a signal transformer, a belt conveyer drive motor, a frequency converter and a programmable controller. The belt conveyer is provided with a conveyer belt and the belt conveyer drive motor. The material detection device is installed right belowunder the conveyer belt and connected with the programmable controller through a signal line. The system starting button is connected with the programmable controller which is connected with the belt conveyer drive motor through the frequency converter by controlling the signal line. The belt conveyer system realizes the automatic control state of ''high speed with materials and low speed without materials''. According to the energy saving system of the belt conveyor and the energy-saving control method of the energy saving system of the belt conveyor provided by the invention, the idle time and idle energy consumption of the belt conveyer can be effectively reduced, so that the system mechanical loss generated in the time is reduced, the work efficiency is remarkably improved, the electric energy loss is reduced, and the purpose of saving energy and reducing consumption is realized.

A frame grabber comprising image signal decoders to convert the analog image signal to digital image data, a multiplexer to select the image data stream sent from the image signal decoders, frame memories and a memory controller to control the digital image data in a unit of frame data to be transferred to an external main image processor unit further has a pulse generator, a pulse counter, a bus controller for transferring the frame data and a time stamping code generator to consolidate the same time base between the in-frame image data and other data used for robot controlling.

The invention relates to a bus line optimizing method based on taxi GPS data and mobile phone signaling data, and aims to solve the problem of low operation efficiency of a bus line because the existing bus line is unreasonable in setting, cannot meet needs very well and does not conform to the actual situation. The bus line optimizing method comprises the following specific processes: 1, acquiring the taxi GPS data, acquiring the mobile phone signaling data, acquiring a land use map and acquiring bus stop data; 2, processing the data acquired in the step 1; 3, calculating bus line optimizingindexes according to the step 2; 31, calculating the distances from an origin point and a destination point to the nearest bus stop; 32, determining the number of bus lines included in the bus stop and the traffic flow; 33, calculating the average running speed of a road vehicle; 4, setting optimizing measures according to the optimizing indexes. The bus line optimizing method is applied to the field of public transportation planning.

A driving circuit includes a dead-time detecting circuit, a duty-cycle controlling circuit, and a switch controlling circuit. The dead-time detecting circuit is coupled to an output of a power switch set for detecting a switching voltage on the output of the power switch set and accordingly outputting a dead-time detecting signal. The output of the power switch set is coupled to the first end of an inductive load, and the second end of the inductive load provides an output voltage. The duty-cycle controlling circuit is coupled to the second end of the inductive load for generating a set/reset signal according to the output voltage. The switch controlling circuit controls the power switch set to be away from a dead state according to the set/reset signal and the dead-time detecting signal.

A sample introduction device for introducing a plurality of independent fluid sample streams into a mass spectrometer includes a manifold (84) having a plurality of fluid sample stream direct paths. Each direct path extends between a fluid sample stream inlet (80, 82) and a fluid sample stream outlet. A plurality of bypass paths (92, 96) is also provided in the manifold. Each bypass path is coupled to a respective one of the direct paths between the inlet and outlet. A plurality of transfer lines (86, 94) is also provided with each transfer line being coupled to a respective one of the outlets to deliver a fluid sample stream to an ionization region of the mass spectrometer. A valve (90, 96) is positioned in each of the bypass paths and is actuable to divert the fluid sample stream entering the direct path via the inlet from the direct path and into the bypass path.

This invention involves an apparatus to measure the nuclear quadrupole (NQR) response of a specimen using three frequencies. Three-frequency NQR involves excitation of at least two transitions that causes an observed signal at a third transition frequency. Thus, the transition excited and detected is not irradiated at all. This reduces undesirable interfering signals due to the excitation, for example as a result of acoustic ringing and/or tank circuit ring-down, since the excitation is not applied at the frequency that is detected. This invention will be particularly useful to detect substances selected from the group consisting of explosives and narcotics using nitrogen NQR.

The invention discloses a stator welding machine. The stator welding machine comprises a rotary working platform, wherein the rotary working platform is provided with three working positions; each working position is provided with a stator tool assembly; the three working positions comprise a put-in working position, a welding working position and an ejecting working position; the welding working position is provided with a pressing assembly which is used for pressing stators, and a welding assembly which is used for welding the stators; the ejecting working position is provided with an ejecting assembly which is used for ejecting the stators. Through the scheme, seamless connection of welding is realized through the arrangement of the three working positions, and the welding efficiency is increased.

The invention discloses a machining method of an assembly line of an angular contact ball bearing sleeve ring. The machining method comprises an outer sleeve ring wiring machining procedure and an inner sleeve ring wiring machining procedure, wherein the outer sleeve ring wiring machining procedure comprises the following steps: (A1) carrying out rough machining on an outer sleeve ring; (A2) carrying out micro machining on the outer sleeve ring and (A3) carrying out finish machining on the outer sleeve ring; and the inner sleeve ring wiring machining procedure comprises the following steps: (B1) carrying out rough machining on an inner sleeve ring; (B2) carrying out micro machining on the inner sleeve ring and (B3) carrying out finish machining on the inner sleeve ring. The machining method of the assembly line of the angular contact ball bearing sleeve ring has the advantages of being capable of guaranteeing high accuracy of a product, high in yield and work efficiency, low in production cost and labor intensity and simple to operate.

The invention discloses equipment for enabling a copper pipe to pass through a fin of a condenser. The equipment comprises a support, as well as a push plate driving system, a copper pipe collector, a fin collecting disc and a traction device which are sequentially positioned on the support, wherein the copper pipe is placed on a supporting base of the copper pipe collector, and clearance layers formed between clapboards or partition posts are stacked; a push plate passes through the upper part of the supporting base which can reciprocate up and down so as to push the copper pipe into the fin hole of the fin collecting disc; meanwhile a draw rod enters into the fin hole from the other side of the fin collecting disc under the effect of a guide mechanism, so as to draw the copper pipe, and a drawing head is inserted into the opening end of the copper pipe; when the draw rod is retreated from the fin hole, the copper pipe is synchronously guided into the fin hole, after that, the push plate and the draw rod are reset, the upper-layer copper pipe orderly falls to the supporting base so as to be subjected to the next round of pipe passing. The equipment is simple in operation and high in stability and safety, and can be used for improving the pipe passing efficiency and the alignment accuracy, reducing the equipment stagnation period in a pipe passing process and reducing the human cost and the equipment loss.

The invention provides a multi-channel pulse amplitude analyzer, wherein, channels work independently for carrying out multi-channel relevance measurement to improve measurement real-time property, and the analyzer has the advantages of simplified structure and flexible expansion. The multi-channel pulse amplitude analyzer comprises a plurality of pulse peak detection circuits, a plurality of ADCs, a plurality of multi-channel data storage circuits, a network transmission module and a timing sequence control circuit, wherein, the pulse peak detection circuits work independently for receiving a multi-channel pulse signal, detecting arrival time of peaks and outputting a plurality of screening signals respectively; the ADCs work independently for starting up A/D conversion on the multi-channel pulse signal and outputting conversion data; the multi-channel data storage circuits receive the conversion data and carry out counting storage; the network transmission module reads and outputs storage data; and the timing sequence control circuit generates a timing sequence signal for controlling an operating timing sequence of the circuits.

Systems and methods of generating timing triggers to determine timing resolutions of gamma events for nuclear imaging includes receiving a pulse signature representing a succession of triggers associated with a photomultiplier. When a number of triggers occurring within a predetermined time interval matches a predetermined number, an event trigger can be initiated. A delayed version of the pulse signature can be generated and compared to a predetermined timing trigger level. When the delayed version matches the predetermined timing trigger level, a timing trigger can be generated. Based on the timing trigger level, the timing trigger can be generated at the pulse of the delayed version that corresponds to the first photoelectron of a gamma event. The timing trigger can correspond to a timestamp for the first photoelectron so that a data acquisition system can identify the pulse from which to acquire energy information to generate a nuclear image.

In a method for controlling combustion in an internal combustion engine with at least one cylinder (30), knock intensity in the cylinder (30) by means of a knock sensor (37) is detected. A predetermined setpoint ignition angle of the cylinder (30) corresponding to a target exhaust gas temperature is adjusted, and a fluid admixture in the cylinder (30) is controlled in dependence on the detected knock intensity.

A quadruple mass spectrometer capable of reducing a settling time-period necessary in a process of changing, in a pulsed or step-like pattern, a voltage to be applied to a quadruple mass filter in a scan or SIM measurement. In the SIM measurement, an optimal settling-time calculation sub-section sets a length of the settling time-period according to a difference ΔM between a next-measurement mass value and a mass value used in an adjacent measurement, and the next-measurement mass value. This makes it possible to shorten a duration of a repetitive cycle in the SIM measurement or increase a time-period assignable to a measurement operation, while ensuring a voltage stabilization time-period sufficient to detect ions having the next-measurement mass value.

The invention relates to a grinding state detecting and controlling method and device based on sound emission. Characteristic parameters of different filtering frequency bands are calculated in the learning stage, and the optimal filtering frequency band required in the working stage is obtained; the stored characteristic parameters in the working stage and the learning stage are compared in real time; the grinding state is accurately judged; a state feedback signal is output to a numerical control system, and a grinding wheel or a workpiece adopts segmented grinding and successive completion during grinding, that is, the numerical control system controls the grinding wheel to perform repeated feed and retract when machining of the single workpiece is completed; fast feed is adopted in the idle stroke stage, and slow feed is adopted in the grinding stage, so that the idle stroke time is shortened and the purpose of removing idle stroke is achieved; meanwhile, the abnormal conditions are detected during grinding are detected so as to prevent equipment damage and achieve the purpose of preventing collision. By means of the grinding state detecting and controlling method and device based on sound emission, on-line monitoring of removing idle stroke and preventing collision is achieved, the grinding efficiency is improved, and automatic and intelligent grinding is achieved.

A process migration method comprising

• • executing a computer program on current computing resources, in a current partition of computations to parallel processes, each parallel process carrying out at least one computation;
  • communicating current partition data to intermediate computing resources;
  • using the intermediate computing resources to calculate new partition data including a new allocation of computations to processes for use on changed computing resources; and
  • migrating the process execution to the changed computing resources by communicating the new partition data to the changed computing resources.

The invention discloses a seamless acquisition method based on DDR2SDRAM array segmented storage, wherein a plurality of storage mapping monomers comprising a memory DDR2SDRAM, a three-dimensional waveform digital image processor and a three-dimensional data point lattice are adopted to alternatively carry out waveform data storage and mapping in a pipeline manner, such that acquisition of the acquisition system can not be stopped due to mapping and other operations so as to reduce a dead zone time and achieve seamless acquisition, wherein the DDR2SDRAM is divided into a plurality of storage units, and a storage depth is increased with a waveform obtained through triggering each storage unit without increase of the dead zone time. With the oscilloscope, segmented storage of the DDR2SDRAM array and alternate storage of the plurality of the DDR2SDRAM are adopted to achieve seamless acquisition at a slow speed base gear, and segmented storage of the DDR2SDRAM array is adopted to achieve seamless acquisition within a short time at a rapid speed base gear.

The invention provides an apparatus for real time observation and recording of fretting wear. According to the invention, a screw thread in a top board of a frame of the apparatus is fixed in a thread connection hole in a plane sample clamp of a fretting testing stand; the upper end of a lens cone in the frame is in fixed connection with the top board, the lower end of the lens cone is connected with a magnifier, and the inner cavity of the lens cone is provided with a light source which emits light rays downwardly and is further provided with a camera which is electrically connected with a computer through a connecting wire; the bottom of a base plate of the frame is provided with a clamping slot used for clamping a plane sample, and the part of the base plate under the magnifier is provided with a through hole communicating with the clamping slot. The apparatus is applicable to any fretting operation mode and can be used for real time observation and recording of dynamic morphological characteristics of a transparent sample, and then accurate dynamic relationship between occurrence of damage and cycle numbers can be obtained through further analysis, thereby providing a more accurate test basis for designing, utilization and maintenance of a machine.

The invention relates to an infrared one-photon detection system of a parallel avalanche photodiode array structure, including a parallel APD array drive circuit. The output end of the parallel APD array drive circuit is connected with the input end of a parallel APD array. The output end of the parallel APD array is connected with the input end of a signal detection circuit, the output end of the signal detection circuit is connected with the input end of an analog-digital conversion circuit, the output end of the signal analog-digital conversion circuit is connected with the input end of a signal processing circuit, and the output end of the signal processing circuit is connected to the input end of a digital signal output circuit. The system uses the parallel APD array to convert a single photon signal into an avalanche electrical signal, uses a direct current bias voltage circuit to operate the parallel APD array in a Geiger mode, realizes the channel timing switching function of the parallel APD array by using a high-speed pulse gating timing signal circuit and a multi-channel optical switch, reduces the dead time of the APD device, overcomes the post-pulse effect of the detector, and effectively improves the working frequency and the detection efficiency of the detector.

The frequency characteristic of a voltage-feedback class-D amplifier circuit for driving an output load is improved. A triangular-wave correction circuit which compensates a gradient of a triangular wave is provided to a triangular-wave signal generator which supplies a triangular wave signal used as a PWM carrier to a comparison circuit for performing PWM modulation of an input signal. In an area where a duty of a command value for an output circuit drive becomes about 50%, a slew rate (gradient) of the triangular wave is decreased.