32results about How to "Reduce equivalent impedance" patented technology

A driver for driving a driving element includes: a signal source, for providing a square signal; a first modulation circuit, for providing on-pulses and off-pulses according to edges of the square signal; a transformer for coupling output signals of the first modulation circuit to a secondary winding of the transformer to form coupled signals; a second modulation circuit for providing first operating pulses according to coupled on-pulses of the coupled signals, and providing second operating pulses according to coupled off-pulses of the coupled signals; a switch device for turning off the switch device according to the first operating pulses and turning on the switch device according to the second operating pulses, and when the switch device is turned off, coupled on-pulses charge an equivalent capacitor of the driving element to a first driving potential to turn on the driving element, and when the switch device is turned off, the equivalent capacitor discharges to a second driving potential to turn off the driving element, and the width of the on-pulses is less than 1000 ns.

The present disclosure discloses a HSD liquid crystal display panel, a display device and a driving method thereof. Said display panel comprises a plurality of sub pixel unit groups connected with data lines and scanning lines, wherein each data line comprises a plurality of winding parts; and wherein the sub pixel unit groups that are spaced from each other by k rows and connected to data line i and the sub pixel unit groups that are spaced from each other by k rows and connected to data line i+m are located in the same column group, so that during display driving the polarity of a sub pixel unit group is opposite to that of its adjacent sub pixel unit group in the same row, and the polarity of a sub pixel unit group is the same as that of the sub pixel unit group which is spaced from said sub pixel unit group by k rows in the same column group, i and k being positive integers and m being odd number.

The invention discloses a high isolation active radio frequency diplexer used for condensed state nuclear magnetic resonance. The diplexer includes a radio frequency excitation access port (1), a nuclear magnetic probe access port (2), a preamplifier access port (3), a TTL control level access port (4), two direct current isolation capacitors (5) and (6), two parallel radio frequency diode pairs (7) and (8), 1 / 4 of a wavelength line (9), a voltage regulator (10), a filter capacitor (11), a Schmitt trigger (13), a single pole double throw radio frequency switch (14), and a preamplifier (15). The method controls a high-speed radio frequency switch by a pulse generator to realize the disconnection during the excitation and the connection when receiving a magnetic signal, can greatly improve the isolation degree (being greater than 70 dB) of conventional diplexer while the introduced insertion loss (being lower than 1 dB) is very low. The method has advantages of a simple and reliable circuit and obvious effects, and plays an important role in improving the signal-to-noise ratio of condensed nuclear magnetic resonance experiments.

The invention discloses a power electronic failure current limiter, which adopts unitized structural design. Each unit consists of a current-limiting resistor and a current-limiting inductive branch, wherein the current-limiting inductive branch provides transient current-limiting impedance and limits the rising rate of a failure current; when the amplitude of a line current of a power grid descends to zero, a switch which is formed by thyristors naturally disconnects the current-limiting inductive branch; and the current-limiting resistor limits the failure current and is used for equalizing voltages of the units, so the units can be connected in series, and requirements on higher voltage class are met.

It's disclosed a current monitor and an electric power quality compensation system. The current monitor includes: an internal monitor module configured to output a measurement of current for characterizing a real-time electric power quality of an external power network based on a received detection current, wherein an external detection module is used to detect a current of the external power network and output a first level detection current; and an isolation and transfer module including an input side and an output side electrically isolated from each other, wherein the input side is configured to be connected with the external detection module, and the output side is configured to be connected with the internal monitor module, the isolation and transfer module receives the first level detection current and outputs a second level detection current to the internal monitor module.

The invention discloses an ultra-low power consumption fast transient response low dropout linear voltage regulator circuit, comprising a first self-bias circuit, an error amplifier, a second self-bias circuit, a buffer, an N-type power tube, a first A compensation network, a second compensation network and a self-bias transistor, the tail current terminal of the error amplifier is connected to the first self-bias circuit, the control terminal of the first self-bias circuit is connected to the output terminal of the error amplifier, so The buffer is connected to the second bias circuit, the control terminal of the second self-bias circuit is connected to the output terminal of the error amplifier, the source of the N-type power tube is connected to the drain of the self-bias transistor, so The first compensation network is respectively connected with the error amplifier and the N-type power tube, and the second compensation network is connected with the error amplifier. The invention improves its transient response capability by widening the loop bandwidth of the low-dropout linear regulator and increasing the slew rate of the grid of the power tube. The present invention can be widely used in the technical field of integrated circuits.

The invention discloses a medium voltage large capacity hybrid DC circuit breaker. A quick breaking module, a primary transfer module, a secondary transfer module and an energy absorbing module are connected in parallel and are then connected in series with an isolation module, the quick breaking module and the isolation module are connected in series to carry a load current of a DC system in normal operation, and the isolation module is used for breaking the normal operation current. The current limiting breaking method is further disclosed, when a short-circuit fault occurs in a DC power system, an arc voltage generated by the quick breaking module makes the current flowing through the quick breaking module transfer to the primary transfer module, the primary transfer module automatically generates a relatively high arc voltage, the fault current is forced to quickly transfer to the secondary transfer module, and lastly, breaking is achieved. The medium voltage large capacity hybridDC circuit breaker is advantaged in that low long-term load loss is low, the current transfer speed of the high current breaking process can be greatly improved, the shutdown current of the secondarytransfer module is reduced, control of the liquid metal is not needed, and effective limitation on the fault current is achieved quickly and reliably.

The invention discloses a stability compensation and impedance conversion circuit of an oscillator frequency adjustment loop; after the improvement, the input control voltage can float in a large range between VDD and GND, which is different from the input control voltage of the prior art which is limited Between less than VDD and greater than GND. A Miller capacitance is connected across the gate and drain of NM2 and NM5. Due to the Miller effect, the input capacitance of NM2 and NM5 becomes very large, resulting in the relatively high-frequency oscillation signal not being input. , so that the stability of the current output by the voltage-to-current module is relatively high. The circuit has the function of impedance transformation, which can improve the efficiency of the oscillator.

The invention provides a combined semicircular dipole printed antenna of balance microstrip line transition waveguide feed, which relates to a dipole printed antenna of balance microstrip line transition waveguide feed, and particularly to a combined semicircular dipole printed antenna of balance microstrip line transition waveguide feed. The invention solves the problems of poorer complanation, ultra-wideband, miniaturization, balance feed and directional diagraph symmetry of the traditional ultra-bandwidth antenna. A left oscillator assembly and a right oscillator assembly are symmetrically printed on the upper surface of the other end of an intermediate medium substrate along a center line of the intermediate medium substrate, the left oscillator assembly comprises a first semiwafer, a second semiwafer and a third semiwafer which are sequentially overlapped along the width direction of the intermediate medium substrate, a transition sheet is printed on the lower surface of the other end of the intermediate medium substrate, and is connected with a short balance microstrip line on the lower surface of the intermediate medium substrate, and a fourth metalized through hole is arranged in the first semiwafer of the right oscillator assembly. The invention is used in the field of radio.

The invention discloses a high-power density magnetic compression power generation mechanism. The high-power density magnetic compression power generation mechanism comprises a stator part and a rotorpart, wherein the stator part comprises first stator iron cores, and a plurality of second stator iron cores which are independent from the first stator iron cores and are vertically arranged; the plurality of second stator iron cores are distributed in parallel; a frame-free coil is arranged between the end part of each second stator iron core and the first stator iron core, and the gaps betweenthe plurality of second stator iron cores are communicated with the gaps between the plurality of frame-free coils to form a plurality of linear motion spaces; the rotor part comprises a plurality ofstrip-shaped permanent magnets which are in parallel and a rotor which is connected with the strip-shaped permanent magnets; and the plurality of permanent magnets are inserted into the linear motionspaces respectively, and high-frequency reciprocating movement is carried out under the driving of the rotor, so that the magnetic flux of the frame-free coils changes violently in the short time, and high electric potential is induced. The invention also discloses an electric generator comprising the power generation mechanism. According to the mechanism, the magnetic flux of the coil changes violently in the short time through high-frequency translation movement, so that high-power density power generation is realized.

The invention discloses a method for governing a background harmonic wave by connecting an impedance type device in parallel. The method comprises the steps of: according to a reactive demand of a system where a bus is positioned, determining fundamental harmonic reactive compensation capacity of the impedance type device; according to a voltage class of the bus, determining a voltage borne by the impedance type device, and then according to required times for filtering out the harmonic wave and the fundamental harmonic reactive compensation capacity of the impedance type device, calculating a total capacitive reactance of a capacitor bank and an inductive reactance of an electric reactor in the impedance type device; determining a capacitive reactance of a single capacitor, then according to a bus voltage, the capacitive reactance of the capacitor bank and the reactive compensation capacity, determining a serial and parallel connection mode and a branch number of each capacitor in the capacitor bank so as to obtain a structure of the impedance type device; and connecting the obtained impedance type device onto the bus in parallel so as to implement government on the background harmonic wave. According to the method, content of the voltage of the background harmonic wave on the load bus can be greatly reduced, so that the adverse effect of the background harmonic wave on safe and stable operation of electric equipment under the load is reduced or improved.

The invention provides a balance microstrip line transition full-mode dual-ridged integrated waveguide feed dipole printed antenna which relates to a dipole printed antenna, and particularly to a balance microstrip line transition full-mode dual-ridged integrated waveguide feed dipole printed antenna. The invention solves the problems that the traditional balance microstrip line feed antenna can not be beneficial to application to an occasion needing longer feed distance due to larger radiation loss and a substrate integrated waveguide single-mode working bandwidth is narrower. A left oscillator and a right oscillator are symmetrically printed on the upper surface of the other end of an intermediate medium substrate along a center line of the intermediate medium substrate, the straight side of the left oscillator and the straight side of the right oscillator are respectively in parallel to the center line of the intermediate medium substrate and are far away from the center line, the arc-shaped side of the left oscillator is connected with a short balance microstrip line on the upper surface of the intermediate medium substrate, a load wafer is connected with the arc-shaped side of the left oscillator, and the middle of the arc-shaped side of the right oscillator is provided with a fourth metalized through hole. The invention is used in the field of radio.