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 invention discloses a crystal oscillating circuit. The crystal oscillating circuit comprises a crystal oscillation circuit and a driving circuit. The crystal oscillation circuit is connected with a digital compensation circuit, the input end and the output end of the crystal oscillation circuit are respectively connected with capacitors C1 and C2 which are grounded, and the crystal oscillation circuit and the digital compensation circuit are connected by a noise reduction circuit. According to the crystal oscillating circuit, the mutual interference between the crystal oscillation circuit and the digital compensation circuit is avoided, the phase noise of the crystal oscillating circuit is optimized, the interference and the crosstalk on a signal channel are weakened greatly, meanwhile, as the two ends of the crystal oscillation circuit are connected with the two capacitor in parallel, the start-oscillation condition of a crystal oscillator is lowered, the start-oscillation reliability is improved, the allowance between the maximum crystal oscillation load and the driving impedance is enlarged, and the oscillating stability is improved.

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.

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.

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 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 provides an active impedance compensation device of a series LC type filter. The active impedance compensation device comprises a power main circuit and a control module. The power maincircuit comprises a two-level three-phase inverter bridge H. A DC side is connected with a supporting capacitor CD in parallel, and an AC side is connected with three groups of LC series filter circuits formed by the series connection of a filter inductor L and a filter capacitor C, wherein the filter capacitor C connected in series can bear most of voltages at common connection points, so that aterminal voltage withstood by the active impedance compensation device is relatively low, a multi-level structure is prevented from being adopted in a system with relatively high voltage, thereby simplifying the control. The control module MC is connected with the two-level three-phase inverter bridge H and is used for providing a driving signal. The control module MC comprises an A / D sampling module, a phase-locked loop, a harmonic detection loop (HDU) and an impedance compensation loop (ZCL), and is used for providing compensation impedance, reducing the equivalent impedance of a power gridat the PCC and improving the stability of the power grid.

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 present invention refers to a system for streamlining energy efficiency, for application in cooling equipment compressors. Said system has at least a main circuit of the frequency inverter (10) and an electric energy power source (FAC) electrically associated to each other. The main circuit of the frequency inverter (10) comprises at least a wave rectifier (4). In addition, the main circuit of the frequency inverter (10) comprises at least a bus capacitor (CB), electrically associated in parallel to the wave rectifier (4) and to the compressor, electrically chargeable by a charge current. Additionally, the main circuit of the frequency inverter (10) comprises at least a passive component (P), electrically associated to the wave rectifier (4), capable of reducing a charge current of the bus capacitor (CB) and / or attenuating the harmonic content of an input current coming from the electric energy power source (FAC). Said system comprises at least a means of obtaining power in an input of the main circuit of the frequency inverter (10). Further, said system comprises at least a control unit (3) operatively associated to the means for obtaining power. Said main circuit of the frequency inverter (10) is provided with an active switch (K) electrically associable in parallel to the passive component (P), and the control unit (3) is arranged so as to permit the drive of the active switch (K) based on the power at the input of the main circuit of the frequency inverter (10). The present invention also refers to a method of streamlining energy efficiency, for application in cooling equipment compressors.

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 relates to the technical field of water vapor detection, in particular to a condensation detection device. The condensation detection device comprises a condensation detection sensor, the condensation detection sensor comprises a substrate, fence-shaped wires drawn on the surface of the substrate are arranged on the substrate, the fence-shaped wires comprise a first exposed copper wire and a second exposed copper wire, and the first exposed copper wire and the second exposed copper wire are arranged in a staggered mode. Through the arrangement of the fence-shaped wires, when water vapor acts on a condensation detection circuit, the water vapor is condensed when meeting cold and is attached to the fence-shaped wires and the substrate, so that the equivalent impedance of the detection circuit is reduced. Whether condensation exists or not and the severity degree of condensation can be known through the magnitude of the equivalent impedance. When the device is used for detecting the condensation, excessive other electronic components are not needed, the cost is extremely low, the implementation is convenient, and the sensitivity is high.

The invention discloses an external tire gauge and an antenna structure thereof. The tire gauge is internally equipped with a circuit, a sensor and a base, wherein the circuit board is used for integrating a control circuit; the sensor is connected with the control circuit and used for detecting the pressure in a tire; the base is mounted in match with an air valve; the antenna structure comprises an antenna stand and a metal conducting wire, wherein the antenna stand is connected with the base; the metal conducting wire is coiled on the antenna stand and electrically connected with the control circuit; the control circuit is used for introducing a detecting signal generated by the sensor to the metal conducting wire and emitting the signal to an external space through the metal conducting wire. According to external tire gauge, the antenna is relatively small in equivalent impedance; a cell with small power can be simply used for supplying power to emit and transmit a signal which reflects the pressure in the tire to the external space, and therefore, the service life of the cell is prolonged; in addition, the antenna is composed of a metal conducting wire, so that the impedance is roughly the same in all parts, and as a result, high definition of the transmitted and emitted signal can be ensured.

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 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 modular precision-adjustable signal coverage system, which comprises a broadband port antenna with a single broadband adjustable signal source coverage angle of 90 degrees, a support plate, an upper mounting cover and a base; the support plate is mounted in the base, and the broadband port antenna is mounted on the support plate. The number and the installation angle of the broadband port antennas can be adjusted according to the actual signal coverage requirement to adjust the signal coverage range; meanwhile, the horizontal angle and the vertical angle of the broadband port antennas are adjusted through a steering support, overall signal coverage of a designated signal coverage area is achieved, the actual signal coverage requirement is met, and the cost is reduced. Moreover, a standing wave tuner is used for correcting the standing wave precision of the equipment, the standing wave index of a specific frequency band can be optimized emphatically, and all covered frequency bands can also be optimized integrally, so that the index requirements of customers on different frequency bands are met, the covered frequency band is 1.5-5Ghz, and the use requirements of 4G and 5G communication FR1 frequency bands are met.

The invention discloses a stability compensation and impedance conversion circuit for an oscillator frequency adjustment loop. Different from that the input control voltage in the prior art is limitedto be less than VDD and greater than GND, the input control voltage after improvement may fluctuate between VDD and GND in a large range. Since a Miller capacitor crosses the gates and drains of NM2and NM5, the input capacitances of the NM2 and NM5 become very large due to the Miller effect, resulting in that a higher-frequency oscillating signal is not input when inputting, so that the stability of the current output by a voltage-to-current module is relatively high. The circuit has the function of impedance transformation, which is capable of improving the efficiency of the oscillator.

The invention discloses a differential reference voltage buffer. The buffer comprises a replication buffer output part which comprises a first NMOS transistor and a first PMOS transistor which share one bias current, the source electrode of the first NMOS transistor and the source electrode of the first PMOS transistor are connected and output positive reference voltage, and the drain electrode ofthe first PMOS transistor outputs negative reference voltage. According to the differential reference voltage buffer, by means of innovation of a circuit structure, by adopting the mode that the source electrodes of the first MPOS transistor and the first NMOS transistor are connected in parallel for output, positive reference voltage output equivalent impedance is lowered, the reference voltagebuildup speed is higher at the same time of improving the current efficiency, the energy consumption efficiency is improved, and the power consumption is lowered.

The present invention refers to a system for streamlining energy efficiency, for application in cooling equipment compressors. Said system has at least a main circuit of the frequency inverter (10) and an electric energy power source (FAC) electrically associated to each other. The main circuit of the frequency inverter (10) comprises at least a wave rectifier (4). In addition, the main circuit of the frequency inverter (10) comprises at least a bus capacitor (CB), electrically associated in parallel to the wave rectifier (4) and to the compressor, electrically chargeable by a charge current. Additionally, the main circuit of the frequency inverter (10) comprises at least a passive component (P), electrically associated to the wave rectifier (4), capable of reducing a charge current of the bus capacitor (CB) and / or attenuating the harmonic content of an input current coming from the electric energy power source (FAC). Said system comprises at least a means of obtaining power in an input of the main circuit of the frequency inverter (10). Further, said system comprises at least a control unit (3) operatively associated to the means for obtaining power. Said main circuit of the frequency inverter (10) is provided with an active switch (K) electrically associable in parallel to the passive component (P), and the control unit (3) is arranged so as to permit the drive of the active switch (K) based on the power at the input of the main circuit of the frequency inverter (10). The present invention also refers to a method of streamlining energy efficiency, for application in cooling equipment compressors.

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.

The invention concerns an electromagnetic radiation detection structure (10) comprising at least one absorbing element defining an absorption plane, and a MOSFET transistor (100). The transistor comprises: at least one first and at least one second zone (111, 112) of a first type of conductivity; at least one third zone (113) separating the first and second zones (111, 112) from each other; and a gate electrode. The first zone (111), the third zone (113) and the second zone (112) are formed respectively by a first, a third and a second layer that extend in the absorption plane parallel to each other and are arranged one after another in a direction perpendicular to the absorption plane. The gate electrode covers the third zone (113) along at least one lateral wall of said third zone (113).

The invention discloses a time-delay stable plasma medium-frequency power supply. The time-delay stable plasma medium-frequency power supply comprises a three-phase 18 pulse wave controllable rectifying circuit, a rectifier filter time-delay starting circuit, a filter energy storage circuit, an IGBT drive circuit, an LC series resonant circuit, a medium-frequency transformer, a variable capacitorand an EMC management circuit, wherein the first output end of the three-phase 18 pulse wave controllable rectifying circuit is connected with the input end of the filter energy storage circuit, the second output end of the three-phase 18 pulse wave controllable rectifying circuit is connected with the input end of the rectifier filter time-delay starting circuit, the first output end of the filter energy storage capacitor is connected with the input end of the IGBT drive circuit, the output end of the IGBT drive circuit is connected with the input end of the LC series resonant circuit, and the output end of the LC series resonant circuit is connected with the input end of the medium-frequency transformer; the input end of the EMC management circuit is connected with the output end of a three-phase alternating current power supply serving as a power supply, and the first output end of the EMC management circuit is connected with the input end of the three-phase 18 pulse wave controllable rectifying circuit. According to the time-delay stable plasma medium-frequency power supply, the stability of a time-delay circuit can be improved.