80results about How to "Reduce leakage inductance" patented technology

A heat dissipation apparatus is suitable for dissipating heat from heat-generating elements in a medium-voltage drive. The heat dissipation apparatus comprises: a heat-dissipating substrate, wherein the heat-generating elements are placed on at least one of a first surface and a second surface of the heat-dissipating substrate; at least one heat pipe group each of which includes a plurality of heat pipes, each heat pipe having an evaporation section and a condensation section, wherein the evaporation section is buried in an inner layer of the heat-dissipating substrate for absorbing heat from the heat-generating elements; and a plurality of fins arranged to be intersected with each heat pipe and connected to the condensation sections of the heat pipes, so as to transfer the heat released from the condensation sections to air. The contact portions between the heat pipe group and the fins are arranged in triangle staggered arrangements.

A battery-charging system includes a power supply having a high-frequency transformer and is configured to deliver a battery charging power to charge at least one battery. The high-frequency transformer has a bobbin including an elongated top and bottom surfaces and first and second substantially semi-circular end surfaces connecting the top surface with the bottom surface to form an elongated first coil winding surface having a central axis. A first coil is wound around the first coil winding surface, and a second coil is magnetically coupled to the first coil and wound thereto.

Since there exists a draw-out portion of a triple insulated wire in a winding structure of a transformer in which the triple insulated wire is used as a secondary winding, the thickness of the transformer is increased by an amount corresponding to the wire diameter of the draw-out portion. Further, when reduction of the thickness of the transformer is prioritized, the secondary winding can be provided only on one side, making it impossible to achieve the sandwich structure. Thus, the coupling between the primary and secondary windings has been sacrificed. An inductance part provided with a magnetic core, two or more sheet coils, and a winding includes: a bobbin constituted by at least two or more sheet coils; and a winding formed by winding a triple insulated wire between the two or more sheet coils constituting the bobbin. A triple insulated wire draw-out portion on the center side of the winding is drawn out to one outer surface side of the bobbin.

Since there exists a draw-out portion of a triple insulated wire in a winding structure of a transformer in which the triple insulated wire is used as a secondary winding, the thickness of the transformer is increased by an amount corresponding to the wire diameter of the draw-out portion. Further, when reduction of the thickness of the transformer is prioritized, the secondary winding can be provided only on one side, making it impossible to achieve the sandwich structure. Thus, the coupling between the primary and secondary windings has been sacrificed.An inductance part provided with a magnetic core, two or more sheet coils, and a winding includes: a bobbin constituted by at least two or more sheet coils; and a winding formed by winding a triple insulated wire between the two or more sheet coils constituting the bobbin. A triple insulated wire draw-out portion on the center side of the winding is drawn out to one outer surface side of the bobbin.

A transformer includes a primary winding unit, a secondary winding unit and a magnetic core. The primary winding unit includes a first input primary winding part and a first shielding winding part. The first input primary winding part is electrically connected to at least one switch component, and the first input primary winding part is electrically connected to the first shielding winding part. The secondary winding unit is inductively coupled to the primary winding unit, and the first shielding part is disposed between the first input primary winding part and the secondary winding part. Then, the primary winding unit and the secondary winding unit are assembled to the magnetic core.

The invention relates to a flow rate sensor (10), which is designed to measure an electrically conductive fluid that flows in pipework. Said sensor comprises a measuring tube (11), which can be inserted into the run of pipework to conduct the fluid, said measuring tube (11) being electrically non-conductive on at least one inner face that comes into contact with the fluid, an electrode assembly (14) comprising at least two measuring electrodes that are located on the measuring tube and tap an electric voltage that is induced in the fluid, in addition to a magnetic field system that is also located on the measuring tube (11). The magnetic field system of the inventive flow rate sensor is equipped with at least two saddle-shaped field coils (15, 16), for generating a magnetic field that penetrates the fluid when operational, a respective ferromagnetic pole shoe (21, 22) for the field coils, for conducting the magnetic field towards the fluid and at least one ferromagnetic feedback element running around the measuring tube upstream of the two field coils and at least one ferromagnetic feedback element (23, 24) running around the measuring tube downstream of the two field coils, for conducting the magnetic field around said measuring tube. The pole shoes are magnetically coupled to the feedback elements by means of respective ferromagnetic coupling elements (17, 18, 19, 20). Each of said coupling elements, which are preferably configured in a standard manner, comprises at least one substantially gully-type cover segment (17a, 18a, 19a, 20a), which receives a first winding section of the respective field coil, said section essentially lying on a first circumferential segment of the measuring tube, or a second winding section (15a, 15b) of the respective field coil, said section essentially lying on a second circumferential segment of the measuring tube.

A transformer is provided, which includes a magnetic core, a primary coil module including a coil support arranged in the magnetic core and a primary coil formed on the coil support, an upper secondary coil module including an upper insulation molded body arranged on an upper portion of the primary coil module and an upper plate coil buried in the upper insulation molded body and arranged to face the primary coil, and a lower secondary coil module including a lower insulation molded body arranged on a lower portion of the primary coil module and a lower plate coil buried in the lower insulation molded body and arranged to face the primary coil.

A battery-charging system includes a power supply having a high-frequency transformer and is configured to deliver a battery charging power to charge at least one battery. The high-frequency transformer has a bobbin including an elongated top and bottom surfaces and first and second substantially semi-circular end surfaces connecting the top surface with the bottom surface to form an elongated first coil winding surface having a central axis. A first coil is wound around the first coil winding surface, and a second coil is magnetically coupled to the first coil and wound thereto.

An electronic converter may include transformer with a primary winding and a secondary winding, wherein the primary winding is coupled to an input for receiving a power signal, and wherein the secondary winding is coupled to an output including a positive terminal and a negative terminal for providing a power signal. The converter moreover may include an electronic switch arranged between the input and the primary winding, wherein the electronic switch is configured to control the current flow through the primary winding. Specifically, the converter may include a snubber circuit arranged between the secondary winding and the output.

A dual magnetic phase rotor lamination for use in induction machines is disclosed. A rotor assembly is provided that includes a rotor core and a plurality of rotor conductors mechanically coupled to the rotor core and positioned thereabout, with the plurality of rotor conductors positioned within slots formed in the rotor core. The rotor core comprises a plurality of rotor laminations that collectively form the rotor core, with each of the rotor laminations being composed of a dual magnetic phase material and including a first rotor lamination portion comprising a magnetic portion and a second rotor lamination portion comprising a non-magnetic portion, wherein the second rotor lamination portion comprises a treated portion of the rotor lamination that is rendered non-magnetic so as to adjust a leakage inductance of the induction machine.

There is provided a transformer capable of significantly reducing leakage inductance while satisfying safety standards. The transformer includes: a winding part having a plurality of coils wound on an outer peripheral surface of a pipe shaped body part while being stacked thereon; and a terminal connection part extended from one end of the winding part in an outer diameter direction thereof and having a plurality of external connection terminals coupled to a distal end thereof, the terminal connection part including at least one catching groove formed such that the coils are led to the outside of the winding part therethrough, and a lead wire of at least one of the coils being led to the outside of the winding part while maintaining a winding direction of the coils.

A primary part of an electrical induction machine, especially a synchronous motor or a linear motor, includes a plurality of modules which each have teeth situated in a row having at least partially encircling slots, in the slot of each tooth a coil is wound around this tooth, and the coils of a single module are connected to a single phase of a rotary current network. The number of modules in the primary part is equal to the number of current phases or an integral multiple thereof. A single module includes an uneven number of teeth but at least three teeth, and teeth directly adjacent to one another of a single module include coils that have an opposite winding direction, which generates an opposite magnetic field polarity at the teeth. An electrical induction machine, especially a synchronous motor or a linear motor, includes a primary part and a secondary part, working together with the primary part via an air gap, which may have permanent magnets as rotor magnets.

An electric motor has an armature rotatably accommodated inside a motor housing and a pair of magnets fixed to an inner surface of the motor housing so as to face the armature. The armature has an armature core 17 fixed to a rotating shaft 16, and ten slots S1 to S10 formed on the armature core accommodate coils. These slots S1 to S10 are of four types that are different in shape, thereby enhancing a lamination factor of each coil. Also, these slots S1 to S10 are formed so as to be tilted in a rotating direction with respect to an axial direction of the rotating shaft 16. Therefore, a magnetic imbalance caused by the slots S1 to S10 being formed in varying shapes is uniformized.

A welding-type power supply transformer including a bobbin, a first coil and a second coil is disclosed. The first coil is wound around the bobbin. The second coil is magnetically coupled to the first coil.

The invention relates to an integral high frequency rectifying device used for solving the problems of heat dissipation and inductance leakage of a high power DC power supply. The technical proposal comprises: the rectifying device comprises a high frequency transformer and a high frequency rectifier, wherein the high frequency transformer consists of an iron core, a primary winding and a secondary winding; the secondary winding is formed by connecting a plurality of winding units with the same structure in parallel, and each winding unit has two turns, the middle point of which is connected with an output cathode copper bar, and the two ends thereof are connected with an output anode copper bar by the high frequency rectifier; the high frequency rectifier comprises a diode and a heat dissipation plate, wherein one end of the diode is fixed on the heat dissipation plate, and the other end thereof is connected with the output anode copper bar; the heat dissipation plate is directly and fixedly connected with a metal tube extracted out of the secondary winding. The windings of the rectifying device are wound by the metal tubes and are internally filled with cooling medium, so as to not only have good heat dissipation effect, but also fully utilize the section of a conductor under the condition of very strong skin effect; therefore, the integral high frequency rectifying device is especially suitable for manufacturing the high power switch-type DC power supply.

A planar magnetic structure has an electrically insulating carrier made up of a base portion and opposed upstanding sidewalls. A plurality of planar primary windings and planar secondary windings are interstitially disposed within the carrier with planar dielectric spacers located between each adjacent pair of windings. A ferrite core envelopes the assembly to magnetically couple the windings. The carrier and windings form at least two spaces-apart sets of cooperating registration features which maintain the windings in fixed alignment with the carrier.

A coiled power device including a magnetic core including a first leg and a second leg which are parallel to each other, the device including a first coil and a second coil to generate mutual inductance between the coils, the first coil including a first winding of conducting wires around the first leg and a second winding of conducting wires around the second leg, the second coil including at least a third winding of conducting wires around the second leg and a fourth winding of conducting wires around the first leg, the first winding and the fourth winding covering the same portion of the first leg to limit leakage inductance of the coiled power device.

The invention relates to a directly-driven wind power generation system and a mode for modulating an SPWM inversion control signal in the system. The directly-driven wind power generation system is characterized in that a high-inductance permanent magnet synchronous generator is arranged and coaxially connected with a wind turbine; an alternating current signal output end of the high-inductance permanent magnet generator is connected in series with a triphase uncontrollable rectifier; direct current output by the triphase uncontrollable rectifier is used as an input signal of a subsequent current type inverter; an output signal of the current type inverter is filtered by a wave filter and fed to an alternating current network as sinusoidal current; the current type inverter consists of a fully-controlled power electronic switch and a current source type full-bridge inverting circuit; and the fully-controlled power electronic switch uses a sinusoidal pulse-width modulating signal SPWM as a control signal. Under the condition of a low wind speed, the directly-driven wind power generation system can also generate power without needing a direct current capacitor of the convertor, simplifies a controlling system, improves the generating efficiency of the whole machine and reduces the cost.

A magentic configuration using a plurality of posts and spiting the primary winding on each of the posts and placing the secondary windings together with the rectifiers menas around each posts to minimise the stray and leakage inductance. In this magentic configurations there is a significant reduction of the core material and a reduction of the footprint by a better utilization of the copper. The magentic field is weaving from through a post to the other minimizing the vertical components and forcing the magentic field to be paralel with the winding reducing the ac copper losses. These properties allows this magentic strcuture to be suitable in very high frequency applications and even in application with air core. These magentic structures can be used for transformer inplementation and also for the inductive applications.

Disclosed is an Auxiliary-Free High-Side Driven Secondary-Side Regulated (AF-HSD-SSR) flyback converter, which includes an AC-to-DC rectification unit, an input capacitor, a switching unit, a current-sensing resistor, an Auxiliary-Free (AF) flyback transformer, an output rectifier, an output capacitor, a PWM controller, and a SSR unit. The AF flyback transformer includes a primary winding and a secondary winding, where the primary winding is split into two halves. The switching unit is placed at the high side of the primary winding, and the PWM controller in collocation with the SSR unit drives the switching unit in response to all the required voltage and current sense signals to keep voltage conversion and power delivery safe and efficient within the specifications. The first half of the primary winding can provide the PWM controller with a continuous and steady working voltage supply after startup, thus eliminating the need for the auxiliary winding.

An electronic device includes a magnetic element, a first circuit module, and a second circuit module. The magnetic element includes a magnetic core group and windings. The windings include a first winding and a second winding and are assembled on the magnetic core group. The first circuit module is coupled to the first winding. The second circuit module is coupled to the second winding. The first circuit module or / and the second circuit module has an overlapping vertical projection area on a first plane with the winding, and the first plane is a plane in the horizontal direction of the winding.

The invention relates to a transformer used for reducing electromagnetic interference influence and an applicable power switching circuit thereof. The transformer at least comprises a winding base, amagnetic core group partially penetrating the winding base, a first primary winding wound on the winding base and composed of a first winding part and a second winding part, a secondary winding woundon the first primary winding, and a first screening element arranged between the first primary winding and the secondary winding to be used for preventing the electromagnetic interference of the firstprimary winding from being conducted to the secondary winding, wherein the electromagnetic interference of the first winding part is larger than that of the second winding part; the first winding part of the first primary winding is arranged near the magnetic core group so as to screen the electromagnetic interference of the first winding part by the magnetic core group; the second winding part is wound on the first winding part and is adjacent to the secondary winding so as to increase the electromagnetic coupling efficiency of the first primary winding and the secondary winding. The invention can reduce the influence the electromagnetic interference to the transformer, thereby enabling the transformer to reduce leakage inductance, and therefore, the converting efficiency is improved.

This invention relates to a transformer (1) for multi-output power supplies such as those commonly found in electronic equipment. The transformer comprises a magnetic core (3) and a plurality of windings (5, 7, 9) at least some of which are fractional windings, arranged about the magnetic core. The transformer comprises a dual transformer structure with a pair of transformers, a main transformer (11) and an auxiliary transformer (13). In a preferred embodiment, the main transformer and the auxiliary transformer are connected together. In this way, readily available magnetic components may be used in the construction of the transformer and the simple construction allows for a large cross-sectional area of transformer to be deployed so that reduced turn counts of windings may be used.

The invention provides a transformer and a plate coil molded body. The transformer includes a magnetic core, a primary coil module including a coil support arranged in the magnetic core and a primary coil formed on the coil support, an upper secondary coil module including an upper insulation molded body arranged on an upper portion of the primary coil module and an upper plate coil buried in the upper insulation molded body and arranged to face the primary coil, and a lower secondary coil module including a lower insulation molded body arranged on a lower portion of the primary coil module and a lower plate coil buried in the lower insulation molded body and arranged to face the primary coil.

A composite isolating transformer includes a main winding rack and a support rack. The main winding rack includes two winding portions coaxially formed to hold respectively a primary coil and a secondary coil, and a separating portion between the two winding portions. The support rack includes a first support half member and a second support half member coupling together to encase at least one winding portion. The first and second support half members have respectively a first cover and a second cover to cover two lateral sides of the winding portion, respectively a first insulating portion and a second insulating portion corresponding to the separating portion and extending towards the separating section to couple together, and respectively a first isolating portion and a second isolating portion extended from the first and second insulating portions towards the winding portion to cover another two lateral sides of the winding portion.

There is provided a transformer capable of significantly reducing leakage inductance while satisfying safety standards. The transformer includes: a winding part having a plurality of coils wound on an outer peripheral surface of a cylindrically-shaped body part while being stacked thereon; and a terminal connection part extended from one end of the winding part in an outer diameter direction and having a plurality of external connection terminals coupled to a distal end thereof, wherein the terminal connection part includes at least one lead groove formed in a radial direction and at least one catching groove formed in the lead groove in a manner in which a width of the lead groove is extended in a winding direction of the coils.

A semiconductor stack for a converter comprises two series-connected semiconductor switches; two terminals for connecting a cell capacitor, which are connected to one another by the two semiconductor switches; at least one cooling element arranged between the semiconductor switches; a frame, by which the semiconductor switches and the cooling element are fixed to one another and which provides the terminals; and at least two snubber capacitors which are mechanically fixed to the frame and which are connected in parallel, are connected to the terminals and which in each case form a commutation loop with the semiconductor switches.