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

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.

The invention aims at providing a screw mandrel transmission synchronous lifting rod which has relative displacement simultaneously between each casing pipe when the rod rises and identical velocity of displacement of rising and high rising speed. The lifting rod comprises that: casing pipes (1, 2, ..., n) are overlapped and sheathed from the external to the internal; the bottom of the casing pipe (1) is arranged on a pedestal; the screw mandrel and the screw nut pass through the casing pipes; the screw nut is fixedly connected with the casing pipe (2); the screw mandrel forms fixed connection with the pedestal along the radial direction of the screw mandrel and forms rotary connection with the pedestal along the circumferential direction of the screw mandrel; a driving device is connected with the screw mandrel so as to drive the screw mandrel to rotate; a pulling fixed pulley is arranged on the casing pipe (i); two ends of an upper pull rope rounding the upper pulling fixed pulley are respectively connected with the casing pipes (i-1 and i+1); when the casing pipe (i) slides upward, the casing pipe (i+1) is driven to slide upward by the upper pulling fixed pulley and the upper pull rope; i is equal to 2, 3, ..., n-1.

The invention relates to a driving circuit unit, a driving circuit and a display device, which can be applied to an AMOLED display, a TFT-LCD, etc. The driving circuit unit in the present applicationcan meet the requirements of multi-type scanning signals of the AMOLED pixel circuits and the driving circuit unit can meet the requirements of multi-type scanning signals of the AMOLED pixel circuits, By adopting a separate input structure, a separate double bootstrap node is formed, which solves the charge coupling problem between different bootstrap nodes caused by clock feed-through effect, restrains the voltage drop of the bootstrap node caused by the leakage of the thin film transistor, and makes the pulse shape of the output scanning signal more complete and symmetrical, and shortens the rise and fall time. By introducing a feedback transistor, the low-level sustain node can still maintain a high level when the threshold voltage of the transistor is negative, and the scanning signalat the output terminal can be maintained at a corresponding low level. The driving method of the present application can improve the electrical performance of the AMOLED pixel circuit, so that the stability and uniformity of the AMOLED display are better.

The invention relates to a sample detecting system of a micro biochemical detection instrument. The sample detecting system comprises an optical system, a spectrum scanning system and a temperature control system, wherein the detecting system is controlled by an embedded type ARM9S3C2410 in real time, so that the optical system, the spectrum scanning system and the temperature control system coordinately cooperate to rapidly detect biochemical indexes in real time. The sample detecting system can realize pulse positioning and precise and random positioning of various sample chambers, has the characteristics of simple structure, small size, convenience to carry, low power consumption and the like, and is widely applied to national defense, after-calamity emergency treatment, biochemistry, clinical medicine, environment science and the like.

A gate line drive circuit includes first, second and third transistors, and a boosting capacitor. The first transistor has a control terminal connected to a charge / discharge control signal of a previous-stage gate line drive circuit, a first terminal, and a second terminal connected to a control node. The second transistor has a control terminal connected to the control node, a first terminal, and a second terminal connected to a first timing signal. The third transistor has a control terminal connected to the control node, a first terminal, and a second terminal connected to a second timing signal. The boosting capacitor has one terminal connected to the control node, and the other terminal connected to the first terminal of the third transistor and a control terminal of a first transistor of a next-stage gate line drive circuit. The first terminal of the second transistor is connected to a gate line.

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.

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.

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.

The present invention provides a device and method for generating a flat-top pulsed strong magnetic field by cooperative power supply of multiple power sources, which mainly includes: a high-voltage capacitor power supply consisting of a high-voltage capacitor bank and a thyristor; a battery power supply consisting of a battery pack, a first DC circuit breaker and The supercapacitor power supply is composed of a supercapacitor bank, a second DC circuit breaker and a multi-phase interleaved parallel DC / DC converter; a high-voltage isolation unit; a freewheeling branch; a magnet; the working process is as follows. The magnet is discharged to make its current rise rapidly, and then when the voltage of the high-voltage capacitor bank is lower than the voltage of the battery pack, the two commutate. The device performs negative feedback control on the magnet current to generate a flat-top magnetic field. After the discharge is completed, the magnet energy is released by the freewheeling circuit. In summary, high stability, long duration, and high flat-top ratio flat-top pulsed magnetic field are generated.

The invention is applicable to the technical field of lifting carriages, and discloses a lifting carriage which is characterized by consisting of a carriage body and a support leg component; the support leg component comprises a fixed sleeve and a sliding sleeve; the sliding sleeve is slidably sleeved on the fixed sleeve; the fixed sleeve is fixedly connected onto the carriage body; a lead screw component is rotationally arranged in the fixed sleeve; a nut component is fixedly arranged in the sliding sleeve; the nut component is in threaded connection with the lead screw component; and a driving component for driving the lead screw component to rotate is arranged on the carriage body. According to the lifting carriage and a lighting device comprising the same, the lifting speed is high, the lifting is stable, the time required for lifting is short, the reliability is high, and valuable time can be grasped for the rescue of emergency rescue, disaster relief and other occasions.

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.

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.