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45results about How to "Short rise and fall times" patented technology

Power source device and magnetic resonance imaging apparatus using the same

InactiveUS20100045113A1Highly accurate high voltageShort fall timeDc network circuit arrangementsMagnetic measurementsAudio power amplifierTransformer
A DC high voltage power source is constituted by an AC-DC converting means (4, 6) that converts a voltage of a commercial AC power source (3) to a DC voltage and steps up the converted DC voltage, a DC-AC converting means (7) that converts the DC voltage stepped up by the previous means to an AC voltage, two insulating transformer (8, 9) that steps up the AC voltage converted by the previous converting means while insulating each others and a series connection of DC voltages obtained after converting the output voltages from the transformers to DCs and smoothing the same. The DC voltage of the DC high voltage power source is used as the power source to current amplifiers (19, 20, 21) constituted by a multi level PWM inverter circuit (18) of 3 levels and the currents flowing through X axis, Y axis and Z axis gradient magnetic field coil (15, 16, 17) in an MRI apparatus connected to these current amplifiers as loads are controlled by a switching control device (18q) so as to meet with current command values (22c1, 22c2, 22c3) from a sequencer 22 in the MRI apparatus. As a result, plural DC high voltage power sources necessary for the multi level PWM inverter is constituted by a comparatively simple circuit, in addition, while suppressing loss in the power sources, a small sized and highly accurate high voltage and large current power source device and a magnetic resonance imaging apparatus using the same are provided.
Owner:HITACHI LTD

Apparatus for conveying electronic element

Provided is an apparatus for conveying an electronic element, capable of ensuring the electronic element to be conveyed with high efficiency and without damage. The apparatus includes a first handover part containing the electronic element (12), a second handover part for moving and placing the electronic element (12), an adsorption picking / placing device (11) for absorbing the electronic element, a suction device (16), and a moving device (tilting stand (3), drive device (13)) for moving the adsorption picking / placing device (11) horizontally. The adsorption picking / placing device (11) is fixed on the moving device without movement up and down. The suction device (16) starts to attract when the adsorption picking / placing device (11) is arranged above the first handover part, and stops attracting when the adsorption picking / placing device (11) is arranged above the second handover part. Moving spaces (S1-S5) where the electronic element (12) and the adsorption picking / placing device (11) can be moved horizontally are formed between the first and the second handover parts.
Owner:TESEC

Acousto-optic Q-switched ytterbium-doped all-fiber laser

The invention belongs to the field of laser devices, and particularly relates to an acousto-optic Q-switched ytterbium-doped all-fiber laser. In order to solve the problems of low coupling efficiency, high maladjustment sensitivity, complex experimental facilities and the like caused by separated component structure in Q-switched fiber laser, the invention adopts a technical proposal of the acousto-optic Q-switched ytterbium-doped all-fiber laser which comprises a fiber bragg grating (FBG), an acousto-optic modulator (AOM) with tail fiber, a multimode coupler, two pumping light-emitting diodes (LDs), ytterbium-doped double-clad fiber and output tail fiber, wherein the two pumping LDs couple pumping light to the ytterbium-doped double-clad fiber respectively by the multimode coupler; the ytterbium-doped double-clad fiber is connected between the output terminal of the multimode coupler and the output tail fiber; the FGB is connected to a signal terminal of the multimode coupler by the AOM with tail fiber, and forms a resonant cavity with the end surface of the output tail fiber simultaneously; and alternating voltage is applied on the AOM. The invention is mainly used in the manufacturing and designing of lasers.
Owner:TIANJIN UNIV

Voltage controlled oscillator for loop circuit

The invention provides a loop circuit voltage control oscillator which comprises a time-delay unit in an even-number stage, wherein the same-phase input and the reverse-phase input of a common time-delay path in a time-delay unit in a first stage of the time-delay unit in an even-number stage are respectively connected with the same-phase input and the reverse-phase output of a time-delay unit in a previous stage of the time-delay unit of a first stage. The same-phase input and the reverse-phase output of the common time-delay path in a time-delay unit in every other stage are respectively connected with the reverse-phase output and the same-phase input of the time-delay unit in a pervious stage of the time-delay unit in every other stage. The input of a negative time-delay path of the time-delay unit in every stage of the time-delay unit in an even-number stage is connected with the output of time-delay units of the first two stages of the time-delay unit in every stage. The control-voltage input end and the power supply input end of the time-delay unit in every stage in the time-delay unit in an even-number stage are respectively connected with the input control voltage end of a loop circuit VCO and a DC power supply.
Owner:SAMSUNG ELECTRONICS CO LTD +1

Power source device and magnetic resonance imaging apparatus using the same

A DC high voltage power source is constituted by an AC-DC converting means (4, 6) that converts a voltage of a commercial AC power source (3) to a DC voltage and steps up the converted DC voltage, a DC-AC converting means (7) that converts the DC voltage stepped up by the previous means to an AC voltage, two insulating transformer (8, 9) that steps up the AC voltage converted by the previous converting means while insulating each others and a series connection of DC voltages obtained after converting the output voltages from the transformers to DCs and smoothing the same. The DC voltage of the DC high voltage power source is used as the power source to current amplifiers (19, 20, 21) constituted by a multi level PWM inverter circuit (18) of 3 levels and the currents flowing through X axis, Y axis and Z axis gradient magnetic field coil (15, 16, 17) in an MRI apparatus connected to these current amplifiers as loads are controlled by a switching control device (18q) so as to meet with current command values (22c1, 22c2, 22c3) from a sequencer 22 in the MRI apparatus. As a result, plural DC high voltage power sources necessary for the multi level PWM inverter is constituted by a comparatively simple circuit, in addition, while suppressing loss in the power sources, a small sized and highly accurate high voltage and large current power source device and a magnetic resonance imaging apparatus using the same are provided.
Owner:HITACHI LTD

Sensor support mechanism for ultrasonic partial discharge live detector

The invention relates to a sensor support mechanism for an ultrasonic partial discharge live detector and belongs to the technical field of GIS (gas insulated switchgear) potential fault diagnosis. The mechanism comprises an insulation rod, a sensor fixing end, a rotary support rod, an ultrasonic sensor placement chamber, an ultrasonic signal amplifier placement groove and the like, wherein the upper end part of the insulation rod is a sensor connection end, the sensor fixing end is linked with the insulation rod through a connection rod, a penetrating screw is arranged at the sensor fixing end, one end of the rotary support rod is arranged on the penetrating screw of the sensor fixing end in a sleeving mode, the rotary support rod is relatively fixed with the sensor fixing end through a rotation direction fixing screw, the ultrasonic sensor placement chamber is fixed at the other end of the rotary support rod, and the ultrasonic signal amplifier placement groove is fixed on the insulation rod through a placement groove fixing screw. The sensor support mechanism can improve live detection personal and equipment safety and improve the live detection efficiency greatly.
Owner:STATE GRID CORP OF CHINA +2

Tomographic atom probe comprising an electro-optical generator of high-voltage electrical pulses

A tomographic atom probe uses electrical pulses applied to an electrode in order to carry out evaporation of the sample being analyzed. In order to produce these electrical pulses, the tomographic atom probe comprises a high-voltage generator connected to an electrode by an electrical connection comprising a chip of semiconductor material. The probe also comprises a light source which can be controlled in order to generate light pulses which are applied to the semiconductor chip. Throughout the illumination, the chip is rendered conductive, which puts the high-voltage generator and the electrode in electrical contact so that a potential step is applied to the latter. The probe also comprises means for applying a voltage step of opposite amplitude to the previous step at the end of a time interval Δt0, so that the electrode finally receives a voltage pulse of duration Δt0.
Owner:CAMECA +1

Sensor support device

The invention provides a sensor support device which comprises at least one section of insulation operation handle, an insulation rod end, a sensor fixing end, a center penetrating screw rod, a rotation support rod, a rotation direction fixing screw rod and a sensor structure support, wherein one end of the insulation rod end is connected with the insulation operation handle; the sensor fixing end comprises a cylinder and a bottom surface, a notch is formed in the upper end of the cylinder, and the bottom surface is connected with the other end of the insulation rod end through a connection rod; the center penetrating screw rod is fixed with the outer side surface of the cylinder after radially penetrating through the cylinder; the center penetrating screw rod is sleeved with one end of the rotation support rod, a plurality of grooves are formed in the rotation support rod in the length direction, and the notch in the upper end of the cylinder enables the rotation support rod to rotate to the horizontal position around the center penetrating screw rod; the rotation direction fixing screw rod is connected to the cylinder opposite to the notch and matched with the grooves so as to fix the rotation support rod; the sensor structure support is fixed at the other end of the rotation support rod, and a sensor is fixed on the rotation support rod.
Owner:NORTH CHINA ELECTRICAL POWER RES INST +2

Display driver and semiconductor device

A display driver includes a data fetching unit that fetches first to Nth pixel data pieces corresponding to luminance levels of respective pixels and outputs the same at a timing of an edge of a clock signal, first to Nth amplifiers that amplify first to Nth gradation voltages corresponding to the first to Nth pixel data piece to obtain first to Nth driving voltages, and a bias voltage generation unit that generates and supplies bias voltages for setting current values of operation currents to the respective amplifiers. The bias voltage generation unit stores a first value and a second value of the bias voltage used for setting the current value to a higher value and a lower value, and generates a bias voltage having the first value during a period from the timing of the edge of the clock signal, and switches the voltage value to the second value thereafter.
Owner:LAPIS SEMICON CO LTD

Full energy storage pulse power supply and current pulse generation method

The present invention relates to a current pulse generation method. The method comprises the steps of: employing an energy storage capacitor to store energy, wherein energy required by an ascent stageof current waveform pulses is supplied by the energy storage capacitor; and returning energy stored in a magnet load inductor at a descent stage of the current waveform into the energy storage capacitor to be prepared for the next pulse so as to achieve repeat utilization of the energy. The full energy storage mode is employed to specifically solve the main problem of the high excitation power supply of the pulse power supply of a particle accelerator.
Owner:INST OF MODERN PHYSICS CHINESE ACADEMY OF SCI

Lifting device for wall cupboard

The invention discloses a lifting device for a wall cupboard, and belongs to the technical field of lifting devices. The wall cupboard comprises a storage cabinet; the quick lifting device comprises afixed frame fixed on an external fixing part, a movable frame moving relative to the fixed frame and a rope connecting the fixed frame and the movable frame; the storage cabinet is detachably connected to the movable frame; a motor and a winding wheel which is driven by the motor to rotate and wind and unwind the rope are arranged on the fixed frame, the movable frame is driven to move through winding and unwinding of the rope. The quick lifting device is simple in structure, convenient to install, detach and replace and high in universality.
Owner:ZHEJIANG JIECHANG LINEAR MOTION TECH

Double speed-up mechanism for mechanical arm lifting

The invention discloses a double speed-up mechanism for mechanical arm lifting. The double speed-up mechanism comprises a horizontal motion frame, a lifting fixing frame, a vertical motion frame A anda vertical motion frame B. The horizontal motion frame is movably mounted on a crossbeam, the lifting fixing frame is mounted on the horizontal motion frame, the vertical motion frame A is mounted onthe lifting fixing frame in a vertically movable manner, and the vertical motion frame B is mounted on the vertical motion frame A in a vertically movable manner. A servo motor drives a rack fixed tothe vertical motion frame A to drive the vertical motion frame A to move up and down, a synchronous pulley moves up and down along with the vertical motion frame A and rotates around an axle at the same time to drive a synchronous belt on the other side of the synchronous pulley to move up and down, and the synchronous belt moves up and down to drive the vertical motion frame B to move up and down. Therefore, under the driving action of the servo motor, the vertical motion frame A moves up and down and drives the vertical motion frame B to move up and down at a same speed, and the vertical motion frame A and the vertical motion B are identical in speed and stroke. The double speed-up mechanism has advantages that mechanical arm lifting time is shortened, connection cycle is met, and equipment cost is reduced.
Owner:滁州市科创模具制造有限公司

Gated silicon-based visible near-infrared single-photon detection device

The invention relates to the field of photoelectric detection, in particular to a gated silicon-based visible near-infrared single-photon detection device which comprises a direct-current high-voltage power supply, a radio-frequency transformer, a high-speed CMOS driver, an FPGA, a high-speed comparator, a human-computer interaction interface and a silicon-based visible near-infrared single-photon detector SAPD. The direct-current high-voltage power supply is connected in series with the inductor and the current-limiting resistor and then is connected with an N pole of the silicon-based visible near-infrared single-photon detector SAPD. The high-voltage gating pulse with short rising and falling time can be generated, the dark counting and post-pulse probability can be effectively reduced while the single-photon detection efficiency is improved, peak noise caused by the front edge and the rear edge of the gating pulse can be effectively filtered out, counting of avalanche signals is achieved, meanwhile, the width, the amplitude and the repetition frequency of the gating pulse can be adjusted, and working points can be conveniently adjusted for different silicon-based visible near-infrared single-photon detectors, so that the performance is better.
Owner:THE 44TH INST OF CHINA ELECTRONICS TECH GROUP CORP

Small trolley for conveying remains

PendingCN113520782AGuaranteed uptimeThere will be no slippage due to underocclusionFuneral devicesCremation furnacesVehicle frameElectric machinery
The invention provides a small trolley for conveying remains. The small trolley includes a framework; a transverse conveying mechanism which comprises a moving motor, a first driving chain wheel, a first chain, a first driven chain wheel, a moving shaft and a rolling wheel which are connected in sequence, the rolling wheel is driven to rotate under the action of the moving motor, and transverse conveying of the framework on the ground is achieved; and a longitudinal conveying mechanism which comprises a traction motor, a second driving chain wheel, a second chain, a second driven chain wheel, a transmission lead screw, a lead screw transmission traction mechanism, a lifting rack and a triangular inclined plate which are sequentially connected, wherein the inclined face of the triangular inclined plate is arranged upwards, and under the action of the traction motor, the lifting rack is driven to move along the inclined face of the triangular inclined plate, so that longitudinal conveying of the lifting rack on the frame is achieved. According to the small remains conveying trolley, operation is stable and reliable, the production cost is reduced, the cremation cost is reduced, the cremation efficiency is improved, and the civilized cremation custom is achieved.
Owner:上海申东环保科技有限公司

Single handle tandem type hydraulic operation system of sloping field hand tractor

The invention discloses a single handle tandem type hydraulic operation system of a sloping field hand tractor. The hydraulic operation system comprises an oil tank, an oil pump, a multiway valve, a first oil cylinder, a second oil cylinder, a first switch and a second switch, wherein the oil tank is connected with the oil pump; the oil pump is connected with the multiway valve; the multiway valve is connected with the first oil cylinder through the first switch, and is also connected with the second oil cylinder; the second oil cylinder is connected with the first oil cylinder through the second switch; and the multiway valve is directly connected with the oil tank. By using the structure, the lifting of the left and right wheels of the tractor can be finished through a single handle, the structure is simple and the operation is convenient.
Owner:山东双菱内燃机制造有限公司

A multifunctional guardrail device for highway combat readiness runway

The invention discloses a highway war preparedness runway multifunctional guardrail device, which comprises a limit plug pin fixed cleaning guardrail and a common guardrail, wherein power-driven round brushes and a dust collection straight slot arranged at and formed in the bottom side of the cleaning guardrail are used for realizing rapid pavement cleaning; fixed parts at one side of the cleaning guardrail are connected with a towing vehicle for realizing pavement clearing; hasps are used for realizing rapid fixation and split between the common guardrail and the cleaning guardrail as well as among split guardrails of the common guardrail; an automatic flip device arranged at the upper part of the common guardrail is used for automatically opening or closing a cover plate; a lifting side light mechanism arranged at the lower side of the cover plate is used for realizing automatic pushout and taking back of runway side lights; power-driven castors arranged at the bottom side of the common guardrail are used for realizing automatic split of the split guardrails. The highway war preparedness runway multifunctional guardrail device is reasonable in structure and complete in functions, and aircraft takeoff and landing time is reduced, so opportunities are won in a war, and modern war preparedness requirements are met.
Owner:HENAN NORMAL UNIV

A device and method for generating a flat-topped pulsed strong magnetic field for a terahertz gyrotron

The invention provides a flat top pulse strong magnetic field generating device and method for a terahertz gyrotron, including: before discharging the magnet, charging and storing energy to the supercapacitor bank and the first high-voltage capacitor bank; when discharging the magnet, firstly controlling the first high voltage The capacitor bank discharges the magnet; when it is detected that the magnet current reaches the set value, the multi-phase interleaved parallel DC / DC converter starts to work, and the super capacitor bank discharges the magnet through the multi-phase interleaved parallel DC / DC converter, according to the first high voltage The terminal voltage of the capacitor bank and the magnet current are state-controlled, and the duty cycle of the PWM control signal of the multi-phase interleaved parallel DC / DC converter is changed to perform negative feedback control on the magnet current to offset the influence of the voltage drop of the supercapacitor bank and the increase of the internal resistance of the magnet , to stabilize the magnet current at the set value; when the set flat-top duration is reached or an abnormal situation occurs, the multi-phase interleaved parallel DC / DC converter is turned off. The invention improves the comprehensive performance of the flat-top pulsed magnetic field.
Owner:HUAZHONG UNIV OF SCI & TECH

Tomographic Atom Probe Comprising an Electro-Optical Generator of High-Voltage Electrical Pulses

A tomographic atom probe uses electrical pulses applied to an electrode in order to carry out evaporation of the sample being analyzed. In order to produce these electrical pulses, the tomographic atom probe comprises a high-voltage generator connected to an electrode by an electrical connection comprising a chip of semiconductor material. The probe also comprises a light source which can be controlled in order to generate light pulses which are applied to the semiconductor chip. Throughout the illumination, the chip is rendered conductive, which puts the high-voltage generator and the electrode in electrical contact so that a potential step is applied to the latter. The probe also comprises means for applying a voltage step of opposite amplitude to the previous step at the end of a time interval Δt0, so that the electrode finally receives a voltage pulse of duration Δt0.
Owner:CAMECA +1

Voltage controlled oscillator for loop circuit

The invention provides a loop circuit voltage control oscillator which comprises a time-delay unit in an even-number stage, wherein the same-phase input and the reverse-phase input of a common time-delay path in a time-delay unit in a first stage of the time-delay unit in an even-number stage are respectively connected with the same-phase input and the reverse-phase output of a time-delay unit ina previous stage of the time-delay unit of a first stage. The same-phase input and the reverse-phase output of the common time-delay path in a time-delay unit in every other stage are respectively connected with the reverse-phase output and the same-phase input of the time-delay unit in a pervious stage of the time-delay unit in every other stage. The input of a negative time-delay path of the time-delay unit in every stage of the time-delay unit in an even-number stage is connected with the output of time-delay units of the first two stages of the time-delay unit in every stage. The control-voltage input end and the power supply input end of the time-delay unit in every stage in the time-delay unit in an even-number stage are respectively connected with the input control voltage end of aloop circuit VCO and a DC power supply.
Owner:SAMSUNG ELECTRONICS CO LTD +1

Sensor support device

The invention provides a sensor support device which comprises at least one section of insulation operation handle, an insulation rod end, a sensor fixing end, a center penetrating screw rod, a rotation support rod, a rotation direction fixing screw rod and a sensor structure support, wherein one end of the insulation rod end is connected with the insulation operation handle; the sensor fixing end comprises a cylinder and a bottom surface, a notch is formed in the upper end of the cylinder, and the bottom surface is connected with the other end of the insulation rod end through a connection rod; the center penetrating screw rod is fixed with the outer side surface of the cylinder after radially penetrating through the cylinder; the center penetrating screw rod is sleeved with one end of the rotation support rod, a plurality of grooves are formed in the rotation support rod in the length direction, and the notch in the upper end of the cylinder enables the rotation support rod to rotate to the horizontal position around the center penetrating screw rod; the rotation direction fixing screw rod is connected to the cylinder opposite to the notch and matched with the grooves so as to fix the rotation support rod; the sensor structure support is fixed at the other end of the rotation support rod, and a sensor is fixed on the rotation support rod.
Owner:NORTH CHINA ELECTRICAL POWER RES INST +2
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