31results about How to "Reduce capacitive reactance" patented technology

The invention discloses a self-excited push-pull type converter which comprises a Royer circuit. An inductor connects a power supply terminal of the Royer circuit with a center tap of a transformer primary winding in the Royer circuit. An inductance value of the inductor is less than one-tenth of an inductance value of a primary winding in the transformer. The center tap of the primary winding isa connection point of two primary windings of the transformer. The self-excited push-pull type converter of the present invention has the characteristics of high consistency, easy debugging, low technology requirement, and good short circuit protection performance.

Disclosed herein is a built-in RFID tire tag. The built-in RFID tire tag includes an antenna and a circuit unit. The antenna is mounted in a tire, and is configured to be operated by resonating with radio waves, which are transmitted from an RFID reader and to have a repetitive corrugated shape. The circuit unit is configured to be operated by being supplied with power using the radio waves. The antenna includes a pair of tag radiators. Each of the tag radiators is divided into a first region and a second region. The corrugation density of the second regions, which are close to the circuit unit, is greater than that of the first regions, which are not close to the circuit unit. The first regions, which depend on rotational motion of the tire, adapt flexibly to bending and torsion of the tire by the difference between the corrugation densities.

The invention provides an ultra-high-voltage GIS rapid transient overvoltage suppression system. The system comprises a metal tank, the inner part of the metal tank is provided with an isolation gap and unit modules connected with the isolation gap, the unit modules comprise resistors, capacitors, and metal bolts, and the resistors are connected with the capacitors via the metal bolts. According to the system, the inner part of the metal tank is provided with the isolation gap and the unit modules, when rapid transient overvoltage of GIS equipment does not occur, capacitive reactance of the isolation gap is high, a transient overvoltage suppression device can be regarded as an open circuit, and normal operation of the GIS is guaranteed; when rapid transient overvoltage of the GIS equipment occurs, the equivalent frequency of the transient overvoltage is high, the capacitive reactance of the isolation gap is low, the device can be regarded as a large load, and energy of rapid transient overvoltage in the GIS is consumed via the resistors so that the amplitude of the transient overvoltage is obviously reduced, and the technical problem of poor suppression effect of rapid transient overvoltage in the GIS in the prior art can be solved.

The invention relates to a high-frequency intelligent response electro-desalting power supply device to solve the problems of high consumption of electricity for refining crude oil, reduction of electric field strength, low effect of electric desalting and dewatering, and the like due to increase of electric field current when the crude oil with high water content, high conductivity or severe emulsification is treated through the conventional electric desalting and dewatering. The high-frequency intelligent response electro-desalting power supply device comprises an electric desalting and dewatering pot, an in-pot electrode plate, a high-frequency intelligent response control cabinet (comprising a bridge rectifier, a capacitor filter, an insulated gate bipolar translator (IGBT) module, a programmable logic controller (PLC) control protection circuit and a current and voltage monitoring circuit), and an explosionproof high-frequency transformer. According to properties of different oil products, different frequencies are selected, and the aim of breaking emulsion is fulfilled under lower electric field strength; therefore, the current is reduced and electric energy is saved.

The invention relates to a piezoelectric low-energy-consumption broadband warning device for an automobile. The piezoelectric low-energy-consumption broadband warning device comprises a shell, wherein an opening is formed on the upper end face of the shell, and a sound transmission hole is formed in the lower end face of the shell; an installation cavity is formed in the shell; a vibration base plate is fixedly arranged in the installation cavity of the shell; a composite piezoelectric sheet is arranged on the upper end face of the vibration base plate, and a vibration thin film is arranged on the lower end face of the vibration base plate; the vibration base plate and the composite piezoelectric sheet form a vibration base source; the vibration thin film and the vibration base plate form a sound transmission source; a circuit board is arranged in the opening of the upper end face of the shell; a flexible circuit board is arranged in the installation cavity of the shell; the circuit board is electrically connected with the flexible circuit board; and the flexible circuit board is electrically connected with the composite piezoelectric sheet. The piezoelectric low-energy-consumption broadband warning device for the automobile has the advantages that the composite piezoelectric sheet serves as the vibration base source, a spring steel material of which the thickness is 0.15 mm to 0.25 mm is hollowed out and serves as the vibration base plate, the molded composite piezoelectric sheet is attached to the vibration base plate, and a layer of polyester vibration thin film is attached to the lower part of the vibration base plate to form the vibration base source, so resonant frequency can reach 800 Hz, high frequency reaches 20,000 Hz, and the performance of a product is improved.

The invention relates to the technical field of antenna equipment and provides a mobile low frequency transmitting antenna which comprises an antenna body in an inverted cone shape. The antenna body comprises a plurality of top wires and a plurality of lead wires. The four top wires are sequentially connected in an end-to-end way to construct the four sides of the top surface of the antenna body.The four lead wires respectively extend downward from the four corners of the top surface and converge to the bottom point to construct the bottom corners of the antenna body. The antenna body of themobile low frequency transmitting antenna is arranged in an inverted cone shape, which is equivalent to increasing the length of the antenna and can effectively reduce the capacitive reactance of theantenna to reduce the antenna voltage and increase the bearing power of the antenna. The conventional tower antenna of several hundred meters can be reduced to several tens of meters and can be more flexible and can be deployed in field positions according to requirements. Although the antenna efficiency is low and the radiation range is limited, the antenna can be used as a supplement to the fixed station and can also make up for the blind area of the fixed station.

The invention discloses a special power adapter for a loudspeaker. The power adapter comprises two connecting covers; the two connecting covers are detachably connected; protective devices are arranged on one sides of the two connecting covers; transformers are mounted in the two connecting covers; capacitors are arranged on one sides of the transformers; one sides of the transformers are connected with a neutral wire and a live wire; the other sides of the transformers are connected with a power wire; one sides of the capacitors are connected with a first ground wire; and the other sides of the capacitors are connected with a second ground wire. According to the special power adapter, the problem that a grounding loop of a wireless microphone to a power supply can only form a power loop through other equipment in a loudspeaker system can be avoided; the capacitive reactance of the grounding loop is reduced, so that when the power supply is converted into audio information, the influence on the frequency response characteristics of loudspeaker equipment is avoided; the occurrence possibility of noises can be effectively reduced, so that the audition enjoyment is improved; good protection performance is achieved; disassembly and maintenance are facilitated; and the service life is prolonged.

The invention discloses an anti-interference current and voltage acquisition method for a power system. The anti-interference current and voltage acquisition method adopts a voltage and current transformer used for converting external voltage and current into voltage output in the range of 0-3.53 V, and the output of the voltage and current transformer is connected with the input of an anti-interference circuit. The anti-interference current and voltage acquisition method comprises the steps that the voltage and current transformer inputs to the anti-interference circuit, the output of the anti-interference circuit serves as the input of a first-stage filter circuit and is input to an AD sampling chip, and then a CPU collects voltage and current data input by the AD sampling chip through adopting a Fourier algorithm. According to the anti-interference current and voltage acquisition method, the anti-interference capability is high, when the voltage and the current jitter, the maloperation of the device is not caused, and the stability of the whole system is ensured.

The invention provides a portable alternating-current and direct-current arc welding generator. The generator comprises an internal-combustion engine, a generator and a bridge rectifier, the generatoris composed of a stator and a rotor. The stator is arranged in the middle of the rotor to form an outer rotor generator; the stator is composed of a stator iron core and a winding. A rectangular groove is axially formed in the outer circle of the stator iron core; a stator winding is wound in a snake shape and embedded in the rectangular groove in the outer circle of the stator iron core in a layered mode, the diameter of enameled wires of the stator winding is matched with the width of the rectangular groove, each layer of enameled wires of the stator winding forms an independent loop, and the stator winding of the independent loop outputs different current densities or voltages in parallel or in series. The output end of the stator winding is connected with the alternating-current inputend of the bridge rectifier, and the direct-current output end of the bridge rectifier is connected with a filter capacitor in parallel. And under the condition that the rotating speed of the rotor is constant, the current output density is large, the quality is high, the carrying is convenient, construction is not limited by a power supply, the cost is low, and the popularization is facilitated.

The invention relates to a combination probes for testing integrated circuit, which comprises: single head probe (1) and terminal (2); the single head probe (1) includes head (13) and end tube (12) which has a spring in the cavity, the head (13) being inserted in the tube (12) inner cavity and moving relative to the tube (12); the upper part of the terminal (2) is hollow and a clamping part is provided in it, any end of the single head (1) being inserted into terminal (2) and its end part being clamped tightly by clamp; the other end of the single head probe (1), which is not inserted into the terminal (2), being electronic connected with the integrated circuit or circuit board for testing, correspondingly, the end (21) of the terminal (2) being employed for testing electronic connections of the testing circuit board or the integrated circuit. Compared with prior technology, the invention has the advantages of having low resistance, capacity reactance or inductive reactance.