220 results about "Transformer types" patented technology

The invention discloses a method for rapidly detecting ferromagnetic grain content in lubricating oil and a detection device thereof as well as a signal processing circuit. A transformer type electromagnetic sensor is adopted, and variation of related parameters of the electromagnetic sensor which is caused by variation of field distribution due to ferromagnetic grain in lubricating oil is detected, so as to detect ferromagnetic substance content in lubricating oil. Influence of nonferromagnetic pollutant can be naturally eliminated, higher linearity can be realized, meanwhile cost is low, and real time property is good.

A first AC / DC converter circuit is coupled via two transformers to a second AC / DC converter circuit, the first AC / DC converter circuit having a symmetrical configuration of two switching elements performing complementary opened / closed switching, to alternately connect positive and negative terminals of a DC source to a junction between transformer primary windings. Each primary winding alternates between a condition of transferring electrical power to a secondary winding and a condition of serving as a choke coil which temporarily stores electromagnetic energy when a current flows through that primary winding and a primary winding of the other transformer.

The invention discloses a three-level inverter of a single-phase mixed bridge, comprising six switching tubes T1 to T6, four diodes D1 to D4, two electrolytic capacitors C1 to C2 and one output filter; wherein the four switching tubes T1 to T4, the two electrolytic capacitors C1 to C2 and the diodes D1 and D2 form a three-level single-phase converter unit of a diode middle point clamping position, the switching tubes T5 and T6, and the two electrolytic capacitors C1 to C2 form a single-phase half-bridge converter unit, a serial-connection branch circuit of D3 and D4 is connected with a serial-connection branch circuit of D1 and D2 in parallel, and the middle point of the D3 and D4 is connected with the middle point of the bridge arm of T5 and T6. The three-level inverter can effectively inhibit ground leakage current of the inverter, and has the advantages of high efficiency and simple modulating method, and the three-level inverter is suitable for a power supply inverter system which has strict ground leakage current, such as no-transformer type photovoltaic grid-connection inverter and the like.

The invention discloses a monitoring device and a monitoring method in a distributed-battery management system. The monitoring device comprises a loop structure and an isolation structure, wherein the loop structure comprises a low-voltage loop and a high-voltage loop; the high-voltage loop comprises an operational amplifier circuit which is integrated by use of single chips with high common mode rejection ratio and adopts a differential inputting-amplifying processing structure; and the isolation structure comprises a communication isolation chip adopting a transformer isolation structure. The monitoring method comprises the steps of receiving a signal, judging whether the signal is received or not, performing initialization settings, acquiring high-voltage loop data, performing transformer-type isolated transmission, processing low-voltage loop data, sending data and judging whether an exit condition is met. Through a technical proposal in the invention, the monitoring device and the monitoring method realize high security, reliability and extremely high accuracy in a battery monitoring process, as well as continuous rapid sampling, and have no special requirements on power supply sources.

This invention relates to a transformer type adjustable reactance, and the static reactive compensator made thereof. The reactance comprises: a parallet transformer unit, voltage source type inverter combniation unit and an adjustable reactance combination unit. Above-said inverter combination unit involves a double arm inverter power source series connected with current-limiting reactance. Adjustable reactane combniation unit involves (N-1) pieces of crystal valve tube throw-over reactance branches, each of which being parallel connection respectively antiparallet connection crystal valve tube T(i1) and a reactance X(i1). The compensator composed by above-said reactance comprises also: a fixed parallet capacitor unit, testing unit and a control unit. Advantages are: no need of special fitler, large capacity, low harmonic wave pollution, quick dynamic response.

The invention elaborates on the waveform addition principle based on waveform continuity and harmonic wave viewpoint, discloses three concepts of flexible alternating current transformation, flexible power transmission and transformation and flexible voltage regulation, discloses three new technologies of the transient impedance technology, the flexible stipples voltage regulating technology and the flexible stepped voltage regulating technology, and discloses three new products of an alternating current voltage regulating electronic switch, a transient impedance transformer and a high speed voltage regulating transformer, and discloses six high-voltage power grid connection methods of a high-voltage power grid connection method for the transient impedance transformer type, a high-voltage power grid connection method for the transient impedance boosting self-coupling transformer type and the like. The novel reactive compensation connection method is provided, so that a reactive compensation device can be in series connection and parallel connection at the port of a secondary outgoing wire of a main transformer of a series voltage regulating transformer. The transient impedance transformer based the alternating current voltage regulating electronic switch can be applied to high voltage, super high voltage alternating and direct current power transmission and other systems needing to be safely, efficiently and synchronously controlled and systems needing large capacity stepless voltage regulation.

The invention relates to a novel triggering method of a large-scale fast discharge linear transformer type driving source formed by connecting tens of stages of induction cavities in series. The novel triggering method comprises the following steps: adopting a triggering system containing n groups of triggering units for providing external triggering pulses for a n-stage induction cavity at the uppermost stream, and further realizing strong triggered closing of a gas spark switch corresponding to the induction cavity; enabling a front n-stage induction cavities to reach a (n+1)-stage induction cavities through spreading electromagnetic pulses which is superposed by voltage of secondary electromagnetic induction along a secondary transmission line; and coupling a switch in the (n+1)-stage induction cavity through a magnetic core, applying the overvoltage electromagnetic pulses in the secondary transmission line to the gas spark switch for realizing the fast overvoltage breakdown closing of the switch till the electromagnetic pulses achieve a load. By adopting the triggering method, the reliability of operation of an LTD (linear transformer driver) device and the triggering system thereof are improved, thereby having important value in popularizing an LTD (Laser Target Designator) to be applied in the national defense fields, such as inertial confinement fusion, fusion energy and the like; and furthermore, the realization of secondary coupling triggering can enable the LTD technology to obtain breakthrough development.

The invention relates to the fields of automotive electronics and artificial intelligence, and in particular discloses a pattern recognition-based vehicle anti-fatigue driving intelligent steering wheel and an anti-fatigue driving monitoring method. The intelligent steering wheel comprises a steering wheel shell (containing an alarm interrupt key), a steering wheel framework, an embedded system (containing a microprocessor, an application program and related algorithms which are solidified in an internal memory), a GPS module, an alarm, a transformer type sensor, a power supply system and an integrated circuit board. The steering wheel has the embedded system serving as a core, acquires the torque and voltage change of the steering wheel through the transformer type sensor, monitors a fatigue driving state by combining the pattern recognition and a sustained driving time parameter, and judges a parking or running state of the vehicle through the GPS data change so as to control the computation period of the sustained driving time. By using the steering wheel as a carrier, the pattern recognition-based vehicle anti-fatigue driving intelligent steering wheel has anti-fatigue driving monitoring function on the premise of not adding any facility, breaks through the research range of domestic video signal-based driver eye physiological characteristics, and improves the anti-fatigue driving practicability.

The invention discloses a magnetic suspension bearing differential transformer displacement sensor that includes differential transformer and detecting circuit. The detecting circuit includes sine wave generating circuit, current amplification circuit, detecting circuit, and low passing filter circuit. The sine wave would be amplified and generate the magnetic flux of the primary coil of the transformer. The alteration of the displacement of the rotator would cause the alteration of mutual inductance between primary coil and secondary primary to generate the corresponding alteration of the secondary coil induced voltage that could form the DC voltage signal of the rotator. The invention has bright application prospect in magnetic suspension bearing. It could also be used to measure other type linear movement or anger movement after taking a little modification.

The invention discloses a pouring technology for an all-fiber optical current transformer. Firstly, epoxy resin castables are obtained and then subjected to preheating and drying treatment; then the epoxy resin castables are placed in vacuum and subjected to mixing and defoaming treatment; a transformer semi-finished product is placed into a mould and preheated; finally, the defoamed epoxy resin castables are placed in vacuum and subjected to pouring defoaming treatment; and after pouring is completed, a mould is subjected to solidification demoulding treatment, and a transformer pouring body is obtained. The pouring technology for the all-fiber optical current transformer adopts a full-vacuum pouring technology and has a good applying effect on transformer type high voltage electric energy meter. Burdening, mixing and the whole process of pouring are all in a vacuum state so that bubbles in a pouring product can be reduced to a large extent, electric insulation strength and mechanical property of the product is improved, the yield of the product is improved, and the cost of the product and labor intensity are reduced. Epoxy resin has excellent electric insulation performance and high mechanical strength, heat resistance and chemical attack resistance are achieved, the cure shrinkage rate and the linear expansion coefficient are good, and dimensional stability and manufacturability are good.

An LED work light has multichip LEDs and a diffusing dome. Each LED may have separate electrical terminals for each chip. The LED work light may have convex lenses forward of each LED. Convex lenses may be hemispherical. Convex lenses may have a nonhemispheric curved surface whose cross section has at least one circular arc and no non-circular arcs. The LED work light has a battery or receives power from an external power source. The LED work light may have a transparent plastic tube as a structural member. A replaceable plastic cover may be added to protect any structural tube or other major transparent part of the LED work light from abrasions. The plastic cover may be tubular. The plastic cover may comprise laminations of plastic that can be removed individually after being abraded. Any external power source may be a wall transformer type and may have current limiting means. The LEDs may be attached to the rear surface of an LED PCB that is fastened to a heatsink in a manner achieving thermal contact between the rear surfaces of the LEDs and the heatsink. A position sensing switch may be used.

The invention relates to a differential transformer type line displacement sensor which comprises an armature, a framework, a primary winding, a secondary winding I and a secondary winding II, wherein a compensation winding I and a compensation winding II are arranged between the secondary winding I and the secondary winding II; phases of the secondary winding I and the secondary winding II are opposite, phases of the compensation winding I and the secondary winding I are same, phases of the compensation winding II and the secondary winding II are same, the tail end of the secondary winding I is connected with the tail end of the compensation winding II, the starting end of the secondary winding II is connected with the tail end of the compensation winding I, and the starting end of the compensation winding I is connected with the starting end of the compensation winding II to be used as a public end. A manufacture method comprises the steps of processing the framework and the armature, winding, regulating and fixing. Voltages of starting ends of the secondary winding I and the secondary winding II are Va and Vb, whether the sum of Va+Vb is within a specified range is judged through calculation, and whether random failures occurs is judged. The differential transformer type line displacement sensor is miniaturized, and has basically same mechanical stroke and linear range; and by using the method, correctness of output signals are effectively judged.

The invention discloses a compensator transformer type voltage regulation method and a device, wherein, the device comprises a compensator transformer bank, combination switches and a system controller; the compensator transformer bank is connected between a power supply and a load in series, and each terminal of a high-voltage winding of every compensator transformer is controlled by the two combination switches alternately; the switching state of the combination switch is controlled by the system controller; the system controller is used for determining the switching combination of the combination switches according to the output voltage of the load and the expected voltage input by the user, and for sending switching signals to the combination switches according to the switching combination. The invention also provides the compensator transformer type voltage regulation method. The invention can eliminate the overvoltage surge of the voltage regulation device generated in the switching process, thus effectively reducing the conduction loss.

The invention discloses an anti-theft detection method for road lamp cables. The method comprises the following steps: accessing a variable frequency current source connected with a reactor, a fixed resistor and a rotary switch in series between a neutral point of a road lamp transformer and a three-phase low voltage busbar; changing injected signal frequency of the current source, measuring current and voltage output from the current source, finding out resonance frequency of a single-phase road lamp circuit, and measuring the number of road lamps and total equivalent capacitance of road lamps connected with the measured road lamp circuit; judging the circuit cable to be stolen if the number of measured road lamps is unequal to the number of actual road lamps, locating the stolen road lamp cable, and sending alarm signals. The method is not affected by transformer type or circuit length, can help accurately determine the position of the stolen cable without adding equipment at ends of the cable, has the advantages of being safe, fast and widely applicable, and completely solves the problem of disconnection alarming for circuit cables which are stolen in a shutdown period of road lamp systems.

The invention relates to an alternating-current controllable paralleling reactor comprising a transformer type main reactor and a step reactor. Wherein, the first coil is the main coil which connects the network directly; the second coil is the control coil outside which a break and a thyristor controller are mounted; the third coil is the compensating coil outside which a filtering compensating unit is mounted; and the transformer type main reactor and the second side-connect step reactor are both mounted in a fuel tank to form the body of controllable reactor. The alternating step controllable single-phase paralleling reactor comprises the body with high resistance, the breaker, the thyristor controller and the central controller, and it has the functions and characters which common reactors do not have, including: simply adjusting, rapid response time, non-harmonic-wave, lower noise, lower vibration, high reliability, lower consumption, and it can separate the harmonic wave to reduce the effect to electrified wire netting. The invention can be used in the electrified wire netting of extra-high voltage and long-distance power transmission.

The invention discloses an oscillator with a transformer-type noise filter, and belongs to the field of radio frequency and millimeter wave integrated circuit design. The oscillator comprises a cross coupling dynatron consisting of a cross coupling N-channel metal oxide semiconductor (NMOS) pair and a cross coupling P-channel metal oxide semiconductor (PMOS) pair, a resonant cavity consisting of a resonant inductor and a resonant capacitor, and a noise filter consisting of a filter transformer and a filter capacitor, wherein the connected relation of each part is as follows: the drain end of the cross coupling dynatron is in parallel connection with the resonant cavity; the source end of the cross coupling NMOS pair of the cross coupling dynatron is connected with one end of the primary side of the filter transformer, and the other end of the primary stage of the filter transformer is grounded; the source of the cross coupling PMOS pair of the cross coupling dynatron is connected with one end of the secondary side of the filter transformer, and the other end of the secondary stage of the filter transformer is connected with a power supply; and the primary side and the secondary side of the filter transformer are respectively connected in parallel with a filter capacitor. By using the oscillator with the transformer-type noise filter provided by the invention, the phase noise of the oscillator can be reduced, and at the same time owing to no need of introducing two inductors, the area and cost are reduced.

A multi-phase transformer type DC-DC converter. In one embodiment, the multi-phase transformer type DC-DC converter includes a plurality of DC-DC converters comprising a plurality of transformers, respectively, wherein the plurality of DC-DC converters are coupled in parallel between an input and an output. A circuit is coupled to the plurality of DC-DC converters and configured to generate a plurality of clock signals for use by the plurality of DC-DC converters, respectively, wherein the plurality of clock signals are phase shifted with respect to each other.

The invention belongs to the technical field of sensors, aims at solving the problem that existing differential transformer type displacement sensors are poor in linearity and low in accuracy and provides a differential transformer type displacement sensor which comprises a primary coil, secondary coils and a framework. The framework is of a cylindrical structure, the primary coil and the secondary coils are wound on the framework, and magnetic conductors are arranged on the framework and are symmetric according to central axis of the framework. When an iron core of the differential transformer type displacement sensor moves in a direction being close to the secondary coils, the magnetic conductors enable magnetic flux passing the secondary coils to be increased greatly, so that magnetic field distribution in the differential transformer type displacement sensor is improved and enabled to be more uniform; a sum of magnetic flux increment of the secondary coils is ensured to be similar to linear changing, so that linearity and output accuracy of the differential transformer type displacement sensor are improved while linear stroke of the same is increased.

The invention provides a power flow control device and method for a run-through power supply system converter type traction substation, and relates to the field of power supply of an AC electrical railway. The power flow control device comprises a transformer type traction substation and an electrical railway run-through power supply system, wherein the electrical railway run-through power supply system comprises a plurality of converter type traction substations, wherein the input end of the control device is connected with a traction feed current transformer and a traction bus voltage transformer of the converter type substation, and is connected with a traction feed current transformer and a traction bus voltage transformer of the transformer type substation through an optical fiber, and the output end of the control device is connected with an AC-DC-AC converter control end of the converter type substation. The control method comprises the following step of adjusting the power of the converter type substation within an allowable voltage range of a traction bus by taking the current, the voltage and the power data of the transformer type substation as references so that the converter type substation and the transformer type substation approach the target of a train load on a traction network according to capacity proportion distribution. The control device is mainly used for the electrical railway run-through power supply system.

A contour and surface texture measuring instrument for measuring a contour and surface texture of a surface of a work W, whose configuration is simple and which can be implemented at a low cost, and which generates a displacement signal having a high resolution and high linearity in a wide measurement range is disclosed, the contour and surface texture measuring instrument having a measurement part 13 having a probe 13 configured to come into contact with the surface of the work W and to change its position vertically, a feed mechanism 14 configured to relatively move the work with respect to the probe, an arm 12 having the measurement part at one end and configured to transfer a displacement of the probe and to rotate with a pivot 16 as a center, and a differential transformer-type detection mechanism 51 and a scale-type detection mechanism 52 attached to the arm or a position interlocked with the arm and configured to detect a displacement of the probe.

The invention provides a method using a dynamic analog device for ultrahigh-voltage transformer type graded controllable parallel reactors, which is designed to accurately simulate a dynamic analog device for transformer type graded controllable parallel reactors with different capacities in 500 kV, 750 kV and 1000 kV power transmission systems. The primary side of the analog device body is in a single-phase discrete type, and three phases are connected to form a Y shape; and a primary winding is provided with 12 turn-to-turn fault taps which can respectively simulate 1-25% of turn-to-turn faults from the high-voltage side to the neutral point side. The secondary side of the analog device body is in a single-phase closed connection way, and the tail end is directly grounded. The capacities are divided into 9 grades: 100%, 75%, 62.5%, 56.25%, 46.875%, 37.5%, 31.25%, 18.75% and 15.625%. The primary side and the secondary side of the analog device body are respectively provided with a current transformer and a voltage transformer, thereby being capable of satisfying the demands for reactor body protection in a dynamic analog test. Aiming at the body protection on the ultrahigh-voltage controllable parallel reactors and the line protection on installation of the controllable parallel reactors, the invention provides a dynamic analog test method.

This invention relates to a desk lamp in which the base of desk lamp is provided with a power lead having a transformer-type plug at one end for plug-in connection with a socket connecting to commercial electricity, a battery chamber within the base for receiving batteries, and a light regulating circuit within the base which has a light regulating knob provided on and protruded to the outside of the base. In this way, the desk lamp not only can be lighten up for illumination purpose under different type power supply such as commercial electricity or battery, but also the light intensity of desk lamp can be regulated through the light regulating circuit by the light regulating knob according to user's demand. In addition, the desk lamp can be used as an emergency light by the use of additionally added batteries. Therefore, it has better performance in total practical application.

The invention provides a high-frequency low-insertion-loss switch, and belongs to the field of communication technology. The high-frequency low-insertion-loss switch comprises a transformer type differential inductor, a transformer type Balun, a capacitor, an NMOS (N-channel Metal Oxide Semiconductor) transistor and a transformer type differential inductor T-L1, wherein the transformer type differential Balun includes a transformer type Balun BA, a transformer type Balun BT and a transformer type Balun BR; and the capacitor includes a capacitor C, a capacitor CA, a capacitor CT and a capacitorCR, an NMOS transistor M1 and an NMOS transistor M2. Through adoption of the high-frequency low-insertion-loss switch, the deterioration of insertion loss caused by substrate leakage loss of a traditional radiofrequency switch at a high frequency can be relieved effectively. A differential switching structure overcomes the parasitic inductance effect of a grounding key and wire. The transformer type differential inductor improves the low quality factor of an on-chip inductor, and more importantly, the chip area occupied by the inductor is reduced.

The invention discloses a multi-gear transformer type voltage drop device which comprises a voltage drop device, a signal measuring module and a device protective module. The voltage drop device comprises a primary side controlled current source, a secondary side controlled current source, a primary side field winding, a secondary side field winding, a drop characteristic setting module, a three-phase impedance calculation module and a three-phase current calculation module. The primary side controlled current source is connected with voltage of power supply grid through a breaker, the secondary side controlled current source is connected with the input end of a tested device, the drop characteristic setting module is used for setting the voltage drop depth, a failure type, the drop speed and the drop time, the three-phase impedance calculation module is used for calculating impedance of a transformer three-phase winding, the three-phase current calculation module is used for calculating the current of the transformer three-phase winding, electrical parameters collected by the signal measuring module are sent to the device protective module, and the signal measuring module is used for protecting the device against the possibly-occuring faults. The multi-gear transformer type voltage drop device can simulate voltage drop experiments with different depths under various faults, and meet the penetrating testing requirements of low voltage of a wind motor set.

A method for testing the moment rigidity of a vehicle hub bearing unit is characterized in that an inner ring flange of a hub bearing unit 7 of a vehicle to be tested is fixed on a testing base 6; a combined loading sleeve 9 is fixedly mounted on an outer ring of the bearing unit; an adjusting thread sleeve 5, a radial tension sensor 4 and a radial slide block 3 are connected sequentially with one end of the bearing unit, and a radial cylinder 1 is connected with the end through a lever 2; the other end is connected with a radial slide block 10, and then connected with an axial cylinder 12, and a guiding rail 13 is adjusted to displace in line with the radial slide block; when in test, the radial cylinder applies a radial load one fourth as much as the weight of the vehicle, the axial cylinder applies the overturning moment as required, and the sensor measures the load; after the radial and axial load is applied, the hub bearing unit of the vehicle to be tested produces inclination on the horizontal section; a differential transformer type displacement sensor 8 measures the inclination of eight points; and the moment rigidity value of the hub bearing unit of the vehicle is obtained after computer software analyses and calculates the inclination of the eight collected points.

The invention provides a direct current transformer type multi-level output direct-current electrical source for quick trace reference. The direct current transformer type multi-level output direct-current electrical source for quick trace reference aims to meet requirements of some occasions needing quick change and trace reference of output voltage. Based on improvement of the prior art, the direct current transformer type multi-level output direct-current electrical source achieves the electrical source structure of single input and multi-level output by utilizing components such as a direct current transformer, a rectifier bridge and a power switch tube. A primary side of the direct current transformer is only connected with a direct-current electrical source, windings are increased in number in a secondary side, each winding secondary side is output in series connection mode after passing through the rectifier bridge and a filter capacitor, and switching on and switching off of the power switch tube can be controlled for achieving multi-level output in real time.