264 results about "Loading coil" patented technology

A non-contact power transmission system comprises: a primary coil including a power supply coil and a magnetic resonance coil; and a secondary coil including a load coil, thereby transmitting an electric power from the power supply coil at a self-resonating frequency of the magnetic resonance coil, which is determined by a parasitic capacitance between wound wires of the coil and a self inductance of the coil, and taking out the electric power supplied, from the load coil of the secondary coil through magnetic coupling, with non-contact, wherein the electric power is transmitted, with non-contact, with applying magnetic coupling in coupling between the power supply coil and the magnetic resonance coil and coupling between the magnetic resonance coil and the load coil.

A wireless power transfer system including a driver coil array, a hexagonally-packed transmitter mat, a receiver coil, and a load coil for powering a medical implant. The magnetically coupled resonance between two isolated parts is established by an array of primary coils and a single small secondary coil to create a transcutaneous power link for implanted devices as moving targets. The primary isolated part includes a driver coil array magnetically coupled to a mat of hexagonally packed primary coils. Power is injected by the driver coils into the transmitter coils in the transmitter mat to maintain resonance in the presence of losses and power drawn by the receiver coil from the magnetic field. The implanted secondary isolated part includes a receiver coil magnetically coupled to a load coil. A rectification / filter system is connected to the load coil supplying DC power to the electronic circuits of the implant.

The invention discloses a self-adaptive wireless charging system, comprising an alternating-current power supply, a load, an AC (alternating current) / DC (direct current) conversion module, a driving module, a driving coil, an emitting coil, a receiving coil, a load coil, a rectifying module, a receiving end impedance matching module and a feedback control module, wherein the alternating-current power supply is connected with the driving coil by the AC / DC conversion module, the driving module, the emitting end impedance matching module and the driving coil that are sequentially connected with one another; the driving coil is coupled with the emitting coil; the emitting coil can transfer energy to the receiving coil by magnetic resonance coupling; the receiving coil is coupled with the loadcoil; the load coil is connected with the load by the rectifier module and the receiving end impedance matching module that are connected with each other sequentially; and the receiving end impedancematching module is connected with the driving module by the feedback control module. The self-adaptive wireless charging system can control the transmitting power of the wireless power supply, can improve the stability and running efficiency of the system, can improve the power factor of the system by a power compensation unit, and can reduce energy loss.

The present invention provides a method and apparatus for performing line qualification tests, and binning the results of such testing. The lines are tested to determine or estimate various characteristics of the line. Physical characteristics of the line may be estimated (e.g. line length, line gauge, insertion loss). The presence of devices on the line such as load coils, bridged taps, terminations and the like may also be determined. A prediction of the data rate the loop can support is made from the measured and estimated line conditions. The results are binned according to certain criteria and to provide an easily discernable status of the line. The binning can be performed by a computer using software designed specifically for this purpose. The binned results may include a first category indicating the line cannot support a certain level of high speed access. The binned results may also include a second category indicating the line can support a certain level of high speed access. The results may also include a third category indicating the line cannot currently support a certain level of high speed access but would be able to upon removal of an impediment. A fourth category indicating the characteristics of the selected line fall outside the area of coverage of the test system may also be included. Each category may be assigned a respective color in order to make the status of the line easily discernable. The testing and binning may be performed for a variety of different high speed access levels. Customers can be charged different rates dependent upon the level of service made available to them.

The invented equipment is in use for controlling current in load coil of electromagnet bearing. The switching power amplifier includes circuit for generating signal of pulse width modulation (PWM), light coupling isolation and switching drive circuit, main circuit of full bridge and current testing circuit. Based on error signal formed from specified signal of current and feedback signal of current, the switching power amplifier carries out PWM. Through light coupling isolation and switching drive circuit, completed PWM signal controls and turns to On / Off of four pieces of power switch tube on two bridge arms of main circuit of full bridge directly. The invention lowers wastage in electromagnet bearing caused by current ripple.

An object is to provide a wireless power feeding system using the resonance method, which can increase power transmission efficiency. The wireless power feeding system includes a power transmission coil electrically connected to a high-frequency power supply, a power transmission resonance coil for transmitting power by electromagnetic induction with the power transmission coil, a power reception resonance coil for exciting high-frequency power by magnetic resonance, a load coil for exciting high-frequency power by electromagnetic induction with the power reception resonance coil, a load, and a variable element. The load includes a microprocessor for controlling the impedance of the load, a battery charger, and a battery. The battery charger is configured to charge the battery with the high-frequency power excited by the load coil.

A method for detecting inductive elements in a communication line, including the processes of: inputting a detecting signal to an end of the communication line; sampling the time domain voltage vector of one end of the communication line; generating the amplitude-frequency characteristic curve of the differential input impedance of one end of the communication line according to the time domain voltage vector; determining the number of the inductive elements in the communication line according to the number of the apexes or zeros on the curve. The present invention also discloses a device for detecting inductive elements in a communication line. By the present invention, the automatic detections of the number of inductive elements such as load coils or phone splitters in the communication line are implemented with the exact detection and the high efficiency, thereby lowering the cost of detecting failures of communication line.

The invention discloses a wireless power transmission device with sidesway adaptability and rotation adaptability, belongs to the technical field of wireless power transmission and aims at solving the problem of low transmission performance caused by the fact that existing wireless power transmission technology is limited by position and angle of a receiving end. The wireless power transmission device comprises an energy transmitting device and multiple energy receiving devices, the energy transmitting device comprises a direct-current power source, a high-frequency power source, an energy excitation coil, an energy transmitting coil and a transmitting end resonant capacitor, each energy receiving device comprises an energy receiving coil, a receiving end resonant capacitor, a load coil and an energy processing circuit, each of the energy transmitting coil and the energy receiving coils comprises three planar coils, planes where spaces of the three planar coils are orthogonal pairwise, and alternating current working frequency generated by the high-frequency power source, inherent frequency of a transmitting end resonant cavity and inherent frequency of a receiving end resonant cavity are identical. The wireless power transmission device is used for energy supply of human body implanting equipment, portable mobile equipment and wireless sensor network nodes.

The invention discloses a single-relay and multi-load wireless power transmission system optimal frequency configuration method based on load power balance. The invention is characterized in that a single-relay and multi-load wireless power transmission system comprises a high frequency power supply system, a transmitting coil, a relay coil, and a plurality of receiving coils. The method comprises the steps of calculating the transmission efficiency of the single-relay and multi-load wireless power transmission system and a receiving power expression based on a load coil space distribution method, obtaining the configuration method of each frequency parameter under optimal transmission efficiency with a system working frequency and the self-resonant frequency of each coil loop as independent variables, and discussing the working frequency in a maximum receiving power and each coil loop self-resonant frequency configuration method on the basis of the optimal transmission efficiency. According to the method, the key problem of the wireless power transmission system comprising a single-relay and multi-load mode is solved, and a definite guidance is provided for the multi-load application of the wireless power transmission system in the middle and long distances.

The invention discloses a wireless charging system applicable to a battery load. The wireless charging system mainly aims at a charging requirement for an energy storage battery load of an electric vehicle and the like. The system is formed by sequentially connecting a power module, a transmitting coil, a receiving coil, a load coil, a rectification and voltage-stabilization module and an energy storage battery, wherein the power module and the transmitting coil form an energy transmitting device of the system; the receiving coil, the load coil and the rectification and voltage-stabilization system form an energy receiving device; under the resonance working state of the system, battery access with different voltage levels and internal resistances is realized by changing the duty ratio of a switching tube in the rectification and voltage-stabilization module at a receiving end, optimum impedance matching during battery load access is realized, and optimal efficiency transmission is achieved. According to the wireless charging system, wireless energy transmission is realized by using a magnetic coupling resonance principle, electric energy can be efficiently and stably supplied to the energy storage battery, and the wireless charging system has a great application prospect.

The invention relates to a medium-frequency induction heating type thermal double-roll reversible mill and a rolling method. A common double-roll reversible mill is used for hot rolling of magnesium and magnesium alloy, zinc and zinc alloy. In a hot rolling process of the magnesium alloy and the zinc alloy, generally, a blank needs to be heated to be between 400 and 450 DEG C, and simultaneously a roller needs to be preheated to be between 100 and 200 DEG C. A preheating mode for the roller generally adopts flame or a resistance heating mode. The medium-frequency induction heating type thermal double-roll reversible mill comprises a semi-open type induction heater reversible mill body, induction load coils of the mill body are arranged along the axial direction of the roller, a bearing of the mill body is provided with a cooling water channel for cooling cyclic water, a roller heating system of the mill body adopts a crystal gate type medium-frequency induction heating device, and the surface temperature of the roller is detected through a far infrared sensor. The mill and the rolling method are applied in the technical field of rolling.

Power is fed from a feeding coil to a receiving coil L3 by magnetic resonance. The receiving coil L3 and a capacitor C3 are connected in series to constitute a receiving coil circuit. A loading coil L4 electromagnetically coupled to the receiving coil L3 is connected to a load through a rectification circuit 142 to constitute a loading circuit. Placing the rectification circuit 142 on a first flat plate electrode 132 of the capacitor C3 allows heat generated from the rectification circuit 142 to escape to the first flat plate electrode 132.

An automatic matching and tuning unit (AMTU), which connects the output from a low or medium frequency, high power radio transmitter, which requires a 50 ohm terminating impedance, to an antenna with an input impedance comprising low resistance in series with a high capacitive reactance. Sensors measure the phase angle between the input current and voltage. The inductance of a series connected loading coil is continuously varied to resonate the antenna capacitance. The resulting input resistance is transformed to 50 ohms using a matching transformer and pair of resonant, mutually coupled coils with adjustable mutual coupling. Sensors measure the input resistance and continuously adjust the mutual coupling coefficient to maintain the required 50 ohm input impedance. Sensors measure the antenna current and vary the transmitter power level to keep it constant. A microcontroller processes all of the sensor outputs and provides serial communication with the transmitter.

A non-contact power transmission system comprises: a primary coil including a power supply coil and a magnetic resonance coil; and a secondary coil including a load coil, thereby transmitting an electric power from the power supply coil at a self-resonating frequency of the magnetic resonance coil, which is determined by a parasitic capacitance between wound wires of the coil and a self inductance of the coil, and taking out the electric power supplied, from the load coil of the secondary coil through magnetic coupling, with non-contact, wherein the electric power is transmitted, with non-contact, with applying magnetic coupling in coupling between the power supply coil and the magnetic resonance coil and coupling between the magnetic resonance coil and the load coil.

An earphone antenna in which a balun is connected to one side and the other side having an audio / high-frequency dual-function signal connecting the earphone unit via a loading coil and wireless equipment connected to the balun, the loading coil selecting low impedance for fundamental frequency and selecting to obtain high impedance for higher frequencies, in order to integrate earphone and antenna.

An object is to provide a wireless power feeding system using the resonance method, which can increase power transmission efficiency. The wireless power feeding system includes a power transmission coil electrically connected to a high-frequency power supply, a power transmission resonance coil for transmitting power by electromagnetic induction with the power transmission coil, a power reception resonance coil for exciting high-frequency power by magnetic resonance, a load coil for exciting high-frequency power by electromagnetic induction with the power reception resonance coil, a load, and a variable element. The load includes a microprocessor for controlling the impedance of the load, a battery charger, and a battery. The battery charger is configured to charge the battery with the high-frequency power excited by the load coil.

A wireless power receiver receives, at a receiving coil, AC power fed from a feeding coil by wireless using a magnetic field resonance phenomenon between the feeding coil and receiving coil. The wireless power receiver includes a loading circuit and a power controller. The loading circuit includes a loading coil that is magnetically coupled to the receiving coil to receive the AC power from the receiving coil and a load that receives the AC power supplied from the loading coil. The power controller includes a measurement unit and an adjustment unit. The measurement unit measures the receiving power of the load. The adjustment unit brings the receiving power close to its maximum value by changing the impedance of the loading circuit.

The preferred embodiments of the present invention generally provide improved communications over a subscriber loop that is loaded with at least one and potentially a plurality of load coils. The preferred embodiments of the present invention will support digital subscriber line service over loaded subscriber loops that also support a native POTS interface and offer various techniques for advantageously arbitrating use of the 0-4 KHz baseband between POTS and DSL. Furthermore, the rapid start and stop DSL modulation techniques as well as various mechanisms such as protocol spoofing allow DSL service to appear to be always-on for many end user applications even though DSL communication may cease for POTS signaling messages and completed POTS telephone calls.

The invention relates to a transient electromagnetic transmitter circuit with loads in parallel connection for discharging. The transient electromagnetic transmitter circuit comprises a DC power supply, an H bridge circuit, load coils, bidirectional switches, a load discharging loop and a constant-voltage clamping circuit, wherein the DC power supply is connected with the load coil N through the H bridge circuit, the load coil I, the bidirectional switch I, the load coil II, the bidirectional switch II...; the load coil I, the load coil II,...and the load coil N are each connected with the load discharging loop; and the load discharging loop is connected with the DC power supply through the constant-voltage clamping circuit. Compared with the prior art, by adopting the bidirectional switches and diodes, the load coils are in a series connection state when the current rises and is stable, and the load coils are in parallel connection state in discharging. The transient electromagnetic transmitter circuit effectively reduces equivalent inductance of the loads in discharging, reduces turn-off delay time of the transmitter, and reduces transient electromagnetic detection blind zone. The load coil segmentation method is flexible, and parallel load inductance value can be changed according to specific detection requirements. Under the condition of same turn-off delay time, the transmitting current or load coil number can be increased, the equivalent magnetic moment is enlarged, and the detection depth and resolution are increased.

The invention discloses wireless charging dynamic control equipment and control method capable of supporting multiple loads. The wireless charging dynamic control equipment comprises a power transmitting circuit group, a multiplexer, a micro controller, an information detection circuit, a power supply module and a coil array; the power supply module is connected with the information detection circuit; the information detection circuit is connected with the microcontroller and the power transmitting circuit group; the microcontroller is connected with the multiplexer and the power transmittingcircuit group; and one side of the multiplexer is connected with each sub circuit in the power transmitting circuit group while the other side is connected with each coil in the coil array. By virtueof the wireless charging dynamic control equipment, reasonable allocation of system resource can be realized, the system transmission efficiency can be improved, and product experience, safety and reliability can be improved; and by changing the coil array structure and parameters, the coupling coefficient deviation between the coil array and a load coil can be lowered.

Systems and methods are described for long subscriber loops using modified load coils. A method includes providing a circuit to extend a transmission medium, the circuit including an inductor and a shunt network, the inductor including a first leg and a second leg, the shunt network including a first circuit portion and a second circuit portion, the first circuit portion including a first capacitor and a first resistor, the first capacitor disposed in a parallel relationship across the first leg of the inductor, the first resistor disposed in a parallel relationship across the first leg of the inductor, the second circuit portion including a second capacitor and a second resistor, the second capacitor disposed in a parallel relationship across the second leg of the inductor, the second resistor disposed in a parallel relationship across the second leg of the inductor; providing an inductive admittance from the first leg of the inductor to a first communication transmitted within a first frequency band; and providing a capacitive admittance from the first circuit portion of the shunt network to a second communication transmitted within a second frequency band. An apparatus includes a circuit including an inductor and a shunt network, the inductor having a first leg and a second leg, the shunt network including a first circuit portion and a second circuit portion, the first circuit portion including a first capacitor and a first resistor, the first capacitor disposed in a parallel relationship across the first leg of the inductor, the first resistor disposed in a parallel relationship across the first leg of the inductor, and the second circuit portion including a second capacitor and a second resistor, the second capacitor disposed in a parallel relationship across the second leg of the inductor, the second resistor disposed in a parallel relationship across the second leg of the inductor, the first leg of the inductor provides an inductive admittance to a first communication transmitted within a first frequency band, and the first circuit portion of the shunt network provides a capacitive admittance to a second communication transmitted within a second frequency band.

An automatic matching and tuning unit (AMTU), which connects the output from a low or medium frequency, high power radio transmitter, which requires a 50 ohm terminating impedance, to an antenna with an input impedance comprising low resistance in series with a high capacitive reactance. Sensors measure the phase angle between the input current and voltage. The inductance of a series connected loading coil is continuously varied to resonate the antenna capacitance. The resulting input resistance is transformed to 50 ohms using a matching transformer and pair of resonant, mutually coupled coils with adjustable mutual coupling. Sensors measure the input resistance and continuously adjust the mutual coupling coefficient to maintain the required 50 ohm input impedance. Sensors measure the antenna current and vary the transmitter power level to keep it constant. A microcontroller processes all of the sensor outputs and provides serial communication with the transmitter.

The invention provides a wireless electric energy transmission system and a driving coil configuration method based on distance adaptation, and relates to the technical field of wireless electric energy transmission. The wireless electric energy transmission system comprises a high-frequency driving power supply, a driving coil group, a transmitting coil, a receiving coil and a load coil group; the driving coil group comprises n parallel driving coils which adopt non-coaxial structures and are positioned on the same plane; the load coil group and the driving coil group are fully symmetrical; and the transmitting coil and the receiving coil are fully symmetrical. By taking the system as the basis, a condition satisfied by the maximum transmission efficiency under different transmission distances is determined, and then the condition is converted into an implicit expression function of the driving coil radius so as to obtain the optimal radius, inductance and series compensation capacitance. The wireless electric energy transmission system provided by the invention adopts the non-coaxial driving coil group, so that portability of a wireless electric energy transmission apparatus is realized and system loss is effectively lowered; and by virtue of the driving coil configuration method based on distance adaptation, it is ensured that the system still can perform wireless electric energy transmission at the maximum efficiency when the transmission distances are changed.

The invention provides a middle distance flat-plate wireless power transmission system based on magnetic resonance coupling. A complanation structure is adopted by the wireless power transmission system, and the system can be processed through a plate-making mode of a printed circuit board. Coil coplanar design is further adopted by the system, by placing an exciting coil (102) and a transmitting terminal resonance coil (101) on the same side of a dielectric substrate, meanwhile, by placing a loading coil and a receiving terminal resonance coil on the same side of the dielectric substrate, a bottom layer of the printed circuit board can be used for adding adjustable electronic parts and components, matching a circuit and rectifying a voltage regulator circuit, and the integration level of the system is improved. A parasitism structure is further adopted by the system, by utilizing a parasitic coil to the resonance coils, the coupling intensity among magnetic coupling resonance coils is strengthened, the transmission efficiency is improved, and the transmission distance is increased. The invention further provides a design and application scheme of a point-to-multipoint wireless power transmission system, and the wireless charging and electricity supplying to multiple consumer electronics, communication equipment and LED lighting equipment are achieved simultaneously.

SELP techniques that provide an accurate estimate of the length of a transmission medium (e.g., subscriber loop in a DSL system) are disclosed. A probe signal is transmitted over the transmission medium at one or more frequencies. A reflected version of the probe signal is then received. Transmission medium impedance is determined based on the ratio of the reflected version of the probe signal and the transmitted probe signal. An estimate of transmission medium length is determined by comparing its impedance to a plurality of predetermined impedances, each of which is associated with a transmission medium having known length. Thus, the length of the systems transmission medium is identified. The transmission medium impedance can also be used to identify the presence of load coils and short circuits in the transmission medium.

A wireless power transmission system according to an exemplary embodiment of the present invention includes: a source coil at a primary side; a load coil at a secondary side; and at least two intermediate coils coupled with each other in an insulated manner with a predetermined turn ratio with respect to the source coil. An effective inductance of the source coil is increased by the at least two intermediate coils and thus a coupling coefficient between the source coil and the load coil is increased.

To provide a power supply circuit which can be applied worldwide without using a high withstand voltage switching element and can supply a load device with stable power. A charging section is arranged between a turn-off capacitor and a load coil. The charging section has the anode connected to the positive terminal of a feedback coil and the cathode connected to the cathode of a zener diode. Thus, when a voltage of a commercial power supply is high, the charging section operates, the turn-off capacitor is quickly charged, an on-period of a transistor is shortened, and an excessive voltage is prevented from being applied between the drain and the source of the transistor. At the same time, an output characteristic indicating relationship between the voltage of the commercial power supply and a current flowing in the load device is permitted to be flat.

The invention discloses a semicontinuous casting liquid cave melt electromagnetic treatment device and a working method thereof. The electromagnetic treatment device comprises a silicon controllable controller, a silicon controllable assembly, an electrolytic capacitor set, an IGBT controller, an IGBT assembly, a hall sensor, a load coil, a PLC core component and a touch screen master element. The load coil is arranged in a cooling water cavity of a crystallizer which comprises an inner sleeve provided with a lubricating oil channel, a water tank partition plate, an exhaust hole, an upper coil positioning clamping piece, a lower coil positioning clamping piece, a load coil, a water sealing plate and a water outlet. According to the semicontinuous casting liquid cave melt electromagnetic treatment device and the working method thereof, by adjusting the load coil parameters such as the frequency, the duty ratio and the average current intensity, electric current with different waveform characteristics can be obtained from the load coil, and therefore corresponding induced electromagnetic fields are obtained, and forced convection of corresponding forms is formed in liquid cave melt. By adoption of the semicontinuous casting liquid cave melt electromagnetic treatment device and the working method thereof, the problem that a light alloy semicontinuous casting blank cannot completely meet the requirements of a plastic deformation process for the grain size and component uniformity of the casting blank is solved.

The invention relates to an anti-cheating method and system for an unattended automatic card-issuing lane. By the adoption of the anti-cheating method and system for the unattended automatic card-issuing lane, cheating behaviors can be effective prevented. According to the anti-cheating method for the unattended automatic card-issuing lane, after a vehicle is driven into the lane, an existing coil is triggered firstly, and an industrial personal computer in an automatic card-issuing machine controls a license plate recognizer to snapshot and recognize the license plate of the vehicle; a driver presses a card getting key to request for a card, and the automatic card-issuing machine conducts card-issuing operation; after the driver gets the card, if the vehicle does not pass through a loading coil I located on an automatic barrier within the preset time ranging from 10 seconds to 60 seconds or if after the vehicle is driven to the position above the loading coil I and triggers the loading coil I, the vehicle does not pass through a loading coil II located behind the loading coil I within the preset time ranging from 10 seconds to 60 seconds or if after the vehicle passes through the loading coil I and the loading coil II in sequence, the vehicle runs backwards to exit from the lane, leaves the loading coil II firstly and then leaves the loading coil I, audible and visual alarm information is sent. By the adoption of the anti-cheating method and system for the unattended automatic card-issuing lane, through the alarm prompt, the cheating behavior that a driver backs a vehicle to repeatedly trigger the coil so that the driver can repeatedly get cards is effectively prevented, and the normal operation order of an expressway is maintained.