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900 results about "Diode rectifier" patented technology
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A rectifier is a diode that is able to convert the current from AC to DC. The rectifier is placed in one of the AC lines before the load. The diode has a small leaked current whenever it is working. The rectifier is used to purify the circuit.
Rechargeable battery circuit and structure for compatibility with a planar inductive charging platform
ActiveUS20070029965A1Reduce thicknessEasy to useBatteries circuit arrangementsTransformersDc capacitorEngineering
A battery pack for an electronic device comprises battery cells, a battery charging circuit, and an energy receiving element adapted to receive power from a planar inductive charging system. The energy receiving element has an inductance and a capacitor is connected to the energy receiving element and forms a resonant tank therewith. A diode rectifier and a DC capacitor are connected to the energy receiving element to provide a rectified DC voltage that can be fed from the energy receiving element to said battery charging circuit. The energy receiving element may comprise a soft magnetic sheet with a coil wound around its edges, or a coil formed on a printed circuit board, or a combination of the two. The energy receiving element may be formed integrally with the battery pack, or may be provided as a separate component that can be added to an existing battery.
Owner:CITY UNIVERSITY OF HONG KONG
Rechargeable battery circuit and structure for compatibility with a planar inductive charging platform
ActiveUS7495414B2Reduce thicknessEasy to useBatteries circuit arrangementsTransformersDc capacitorEngineering
Owner:CITY UNIVERSITY OF HONG KONG
Resonant converters and control methods thereof
ActiveUS20150229225A1Improve performanceReducing switching-frequency rangeEfficient power electronics conversionDc-dc conversionTime delaysEngineering
Control methods for resonant converters offer improved performance in resonant converters that operate with a wide input-voltage range or a wide output-voltage range (or both) by substantially reducing the switching-frequency range. Reduction in the switching frequency range is achieved by controlling the output voltage with a combination of variable-frequency control and time-delay control. Variable-frequency control may be used to control the primary switches of an isolated resonant converter, while delay-time control may be used to control secondary-side rectifier switches provided in place of diode rectifiers. The secondary-side control may be implemented by sensing the secondary current or the primary current (or both) and by delaying the turning-off of the corresponding secondary switch with respect to the zero crossings in the secondary current or the primary current.
Owner:DELTA ELECTRONICS INC
Battery-charging method and battery-charging apparatus
InactiveUS20090309537A1Boost battery powerBatteries circuit arrangementsCharging stationsAlternating currentElectric generator
Disclosed is a battery-charging method and apparatus which is designed to improve charging efficiency during charging of a battery using an external power source, without increasing the number of components. The battery-charging method of the present invention comprises the steps of: forming an electric circuit which includes: an alternating-current generator operable to output alternating current, and an external power source; a diode rectifier operable to rectify the alternating current output from the alternating-current generator into a direct current by a diode; and a battery which is chargeable using an output of the alternating-current generator, which are serially connected in this order; and supplying an alternating current fed from the external power source, between the alternating-current generator and the diode rectifier (S4, S1, S5).
Owner:MAZDA MOTOR CORP
A wireless powering device, an energizable load, a wireless system and a method for a wireless energy transfer
InactiveCN1950914AImprove use comfortIncreased durabilityTransformersDc-dc conversionInductor windingsEngineering
A wireless resonant powering device (1) according to the invention comprises a first inductor winding (3), which is arranged to form a transformer (9) with the inductor winding (13) of the energizable load (11). The first inductor winding (3) is arranged to form a resonant circuit (5), which may comprise a suitable plurality of electric capacitances and coils. The components of the resonant circuit (5) are selected such that the magnetic energy received by the inductor winding (13) damps the energy flow in the resonant circuit so that the induced voltage in the inductor winding (13) is substantially constant and is independent of the magnetic coupling between the first inductor winding (3) and the inductor winding 13 at the operating frequency of the driving means (6). The resonant circuit is driven by the driving means (6), comprising a control unit (6c) arranged to induce an alternating voltage between a first semiconductor switch (6a) and a second semiconductor switch (6b). At the output of the transformer (9) an alternating voltage is generated, which is rectified to a DC-voltage by a diode rectifier, filtered by an output capacitance. The resonant circuit (5) is operable on its coupling independent point by the driving means (6). This figure schematically illustrates a situation, where a variable coupling between the first inductor winding (3) and the inductor winding (13) exists. The invention further relates to a wireless inductive powering device, an energizable load, a wireless system and a method for wireless power transfer.
Owner:KONINKLIJKE PHILIPS ELECTRONICS NV
Microgrid system with asymmetric non-linear load and power balancing control method
InactiveCN105071405ASolving Harmonic ProblemsSolve balance problemsPolyphase network asymmetry elimination/reductionReactive power adjustment/elimination/compensationMicrogridPower balancing
The invention dsiclsoes a microgrid system with an asymmetric non-linear load and a power balancing control method. The system comprises a plurality of DG units connected in parallel and line impedors connected with all DG units. The line impedors are connected to a microgrid bus by PCC points. A three-phase balancing resistive load, an asymmetric linear load, and a diode rectifier non-linear load of a load unit are connected to the microgrid bus by PCC points. A measurement module for measuring voltage fundamental wave positive sequence and negative sequence components and harmonic wave components of the PCC points is also connected to the microgrid bus. The microgrid bus is connected with a 10-kV main power grid by a static switch and a transformer successively. According to the invention, reactive and harmonic power balancing of the microgrid is realized by using a selective virtual impedance based on the virtual fundamental positive and negative sequence impedance and the virtual variable harmonic impedance; a harmonic and unbalancing voltage compensation controller enables equal division of an unbalanced power and a harmonic power to be realized; and a problem of unbalancing of the harmonic wave and the voltage of the microgrid can be solved.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Multiple output converter with improved cross regulation
InactiveUS6987679B2Cross regulation can be improvedContinuous currentAc-dc conversion without reversalEfficient power electronics conversionPower MOSFETConductor Coil
A cost effective circuit improves the cross regulation of multiple outputs converter, especially for that output chokes are coupled and a synchronous rectifier is applied to one of the outputs. A DC / DC converter includes a transformer having a primary winding and two secondary windings. The first secondary winding is coupled to a synchronous rectifier and a first output choke. The second secondary winding is coupled to a diode rectifier and a second output choke. The first output choke and the second output choke are coupled. A low power MOSFET switch is added to the diode rectifier for avoiding the diode rectifier operating in DCM when light loaded.
Owner:DELTA ELECTRONICS INC
Resonant-mode power supply with a multi-winding inductor
ActiveUS20140133189A1Efficient power electronics conversionAc-dc conversionSwitching frequencyInductor
A resonant-mode power supply, comprising an assembly of switches connected in a bridge or a half-bridge configuration, a series resonant circuit connected in the bridge or half bridge diagonal, a part of which is formed by a multi-winding inductor by means of which a load is connected, and a controller configured to stabilize output voltages or currents by controlling the switching frequency of the assembly of switches. The series resonant circuit comprises an energy recirculation circuit (ERC1) for limiting the resonant circuit quality factor, connected through the diode rectifier (DR2) to the supply voltage node and a current monitoring circuit (CMC) configured to monitor the recirculation circuit current (Ilim) and, by means of the controller (C), to change the switching frequency of the assembly of switches (K1, K2, K3, K4) in order to reduce power supplied to the resonant circuit upon exceeding the threshold value by the current (Ilim) in the energy recirculation circuit (ERC1).
Owner:ACAD GORNICZO HUTNICZA IM STANISLAWA STASZICA
System linking apparatus for generated electric power
ActiveUS7433212B2Small sizeEfficient constructionAc-dc conversion without reversalSingle network parallel feeding arrangementsElectric power systemEngineering
Owner:FUJI ELECTRIC CO LTD +1
DC (Direct Current) power transmission system with function of unidirectionally transmitting power
ActiveCN102222929AReduce capacityLow costDc network circuit arrangementsElectric power transfer ac networkElectric power transmissionTransmitted power
The invention belongs to the technical field of DC (Direct Current) power transmission, particularly a DC power transmission system with a function of unidirectionally transmitting a power. The DC power transmission system is characterized in that both ends of a diode rectifier are connected in parallel with low-power modularized multilevel converters; an AC (Alternate Current) end of the diode rectifier is connected with a sender system; a DC end of the diode rectifier is connected with a sender of a DC power transmission circuit; AC ends of the low-power modularized multilevel converters are connected with the sender system; DC ends of the low-power modularized multilevel converters are connected with the sender of the DC power transmission circuit; a DC end of a full-power modularized multilevel converter is connected with a receiver of the DC power transmission circuit; and an AC end of the full-power modularized multilevel converter is connected with a receiver system. The low-power modularized multilevel converters are used as active power filters to filter out a harmonic current generated by the diode rectifier, provide start power (such as service power) for the sender system when the sender system loses power, provide an AC voltage resource for the sender system.
Owner:梁一桥
Low loss synchronous rectifier for application to clamped-mode power converters
InactiveUSRE36571E1Improve efficiencyAc-dc conversion without reversalEfficient power electronics conversionMOSFETLow voltage
A synchronous rectifier for use with a clamped-mode power converter uses in one embodiment a hybrid rectifier with a MOSFET rectifying device active in one first cyclic internal of the conduction / nonconduction sequence of the power switch and a second rectifying device embodied in one illustrative embodiment as a low voltage bipolar diode rectifying device active during an alternative interval to the first conduction / nonconduction interval. The gate drive to the MOSFET device is continuous at a constant level for substantially all of the second interval which enhances efficiency of the rectifier. The bipolar rectifier device may also be embodied as a MOSFET device. The subject rectifier may be used in both forward and flyback power converters.
Owner:LINEAGE POWER +1
Ground power unit for aircraft
InactiveUS20110133573A1Energy efficient operational measuresAc-dc conversionGround vehiclesConductor Coil
Embodiments of a ground power unit are disclosed for providing power to a grounded vehicle, such as an aircraft. In accordance with certain embodiments, the ground power unit (GPU) accepts a wide range of AC input voltages and is capable of providing a range of DC output voltages. The GPU may include a switched rectifier that converts an AC input signal to a DC link signal. The DC link signal is then converted to a switched DC signal that simulates an AC-like sine wave using a high frequency DC-to-DC switching converter. A single-phase transformer modulates and isolates the switched DC signal, which is subsequently converted to a DC output signal using diode rectifiers coupled to the secondary winding of the transformer. The disclosed GPU may be controlled using a software-based control algorithm that controls the AC input parameters independently of the DC voltage parameters.
Owner:ILLINOIS TOOL WORKS INC
Hybrid parallel type high-voltage direct current traction power supply current transformer and control method thereof
InactiveCN102394557AImprove DC output voltageReduce lossAc-dc conversion without reversalHigh-voltage direct currentPWM rectifier
The invention relates to a hybrid parallel type high-voltage direct current traction power supply current transformer and a control method thereof. The hybrid parallel type high-voltage direct current traction power supply current transformer is characterized by comprising a set of pulse width modulation (PWM) rectifier units and a set of diode rectifier units, wherein both an input end of the PWM rectifier units and an input end of the diode rectifier units are connected with an alternating current electric network, and an output end of the PWM rectifier units and an output end of the diode rectifier units are connected in parallel to realize high-voltage direct current output. Because the PWM rectifier units and the diode rectifier units are connected in series, the direct current output voltage of the entire current transformer is improved, the power supply distance is prolonged, and the contact net loss is reduced. Meanwhile, equipment investment is reduced, and the reliability of a system is improved. The hybrid parallel type high-voltage direct current traction power supply current transformer and the control method thereof can be widely applied to urban railway transit traction power supply systems.
Owner:TSINGHUA UNIV +1
Portable battery charger powered by internal combustion engine
ActiveUS7471000B1Easy to carryFirmly connectedBatteries circuit arrangementsMachines/enginesExternal combustion engineVoltmeter
Owner:WHEATLEY VANESSA MARIE +1
Hybrid electric vehicle
InactiveUS20080315803A1Reduce lossesEnergy lossDC motor speed/torque controlAC motor controlEngineeringElectric vehicle
A hybrid electric vehicle includes, in one example, a motor-generator driven by an engine to generate alternating current, wherein the motor-generator is further configured to start the engine, a motor for driving the vehicle, a diode rectifier to rectify alternating current generated by the motor-generator, an inverter connected to a feed circuit between the diode rectifier and the motor to convert direct current in the feed circuit into alternating current, a power supply connected to a line connecting the diode rectifier with the inverter, a first feed circuit to supply current to the motor to drive the vehicle through the diode rectifier and the inverter in series a second feed circuit to connect the motor-generator with the power supply while bypassing at least the diode rectifier, and an alternating current converter provided in the second feed circuit.
Owner:MAZDA MOTOR CORP
Method and apparatus for detecting a fault in a brushless exciter for a generator
A method of operating an electrical machine including: providing a brushless excitation system including a diode rectifier having at least one diode; sensing heat energy generated by the at least one diode; detecting a deviation of the generated heat energy from the at least one diode, and generating a signal indicating a failed or faulty diode if the deviation in generated heat energy exceeds a predetermined threshold deviation level.
Owner:GENERAL ELECTRIC CO
Variable frequency drive soft charge circuit
A variable frequency drive comprises a diode rectifier receiving multiphase AC power and converting the AC power to DC power. An inverter receives DC power and converts the DC power to AC power to drive a load. A link circuit is connected between the diode rectifier and the inverter and comprises a DC bus to provide a relatively fixed DC voltage for the inverter. A link capacitor is across the bus. A soft charge circuit limits in rush current to the link capacitor. The soft charge circuit comprises an inductor in the bus and a resistor assist circuit across the inductor along with an anti-parallel clamping thyristor reverse connected also across the inductor.
Owner:YASKAWA ELECTRIC AMERICA
System and methods for controlling secondary side switches in resonant power converters
ActiveUS9490704B2Improve performanceNarrow down the frequency rangeEfficient power electronics conversionApparatus with intermediate ac conversionTime delaysResonant power converters
Owner:DELTA ELECTRONICS INC
Detecting device for detecting IGBT
ActiveCN101639514ASignificant advantagesSignificant beneficial effectIndividual semiconductor device testingElectrical resistance and conductanceCoupling
The invention relates to a detecting device for detecting IGBT, comprising a shell and a testing circuit internally installed in the shell. The testing circuit consists of a power board, an I / O board,a central processing unit, a driver module, a micro breaker, an automatic coupling voltage regulator, a rectifying circuit, a filter circuit and an inverter circuit. A single-phase 220V, 50Hz alternating current power supply source is connected with the original edge of the automatic coupling voltage regulator in series; the secondary edge of the automatic coupling voltage regulator is connectedwith an AC voltmeter in parallel and inputs alternating voltage into a diode rectifier bridge module; the positive end of the automatic coupling voltage regulator is connected with a limit resistor inseries, is connected with a filter capacitor, a equalizing resistor and a DC voltmeter in parallel, and is connected with a fuse in series; +P and -N bus is connected with an inverse bridge formed byan IGBT module in parallel; the output end of the inverse bridge is connected with an output resistor; and the other end of the resistor is connected with the middle connecting point of the equalizing resistor. By detecting the PWM waveform of the output resistor, the detecting device can ensure the condition of the IGBT, has simple and easy measuring method, is time saving and labor saving, andis applicable to various IGBT detections.
Owner:天津华云自控股份有限公司
Low stress soft charge circuit for diode front end variable frequency drive
A variable frequency drive comprises a diode rectifier receiving multiphase AC power from a source and converting the AC power to DC power. An inverter receives DC power and converts the DC power to AC power to drive a load. A link circuit is connected between the diode rectifier and the inverter and comprises a DC bus to provide a relatively fixed DC voltage for the inverter. A bus capacitor is across the bus. A soft charge circuit limits inrush current to the bus capacitor. The soft charge circuit comprises an inductor connected between the source and the link circuit and a switch circuit in the link circuit for selectively providing a semiconverter configuration or a full bridge converter configuration to provide two stage charging of the bus capacitor.
Owner:YASKAWA ELECTRIC AMERICA
Protected capacitor system and method
InactiveUS20170229242A1Improve economic performanceHigh efficiency performanceElectric motor controlFixed capacitor housing/encapsulationDIACOvervoltage
A protected capacitor system / method implementing enhanced transient over-voltage suppression is disclosed. The system / method incorporates one or more surge suppression devices (SSDs) proximally located and in parallel with a capacitor structure to produce an overall protected capacitor structure having enhanced reliability and simultaneous ability to resist transient overvoltage conditions. The SSDs are formed from series combinations of transient voltage surge suppressors (TVSs) (metal oxide varistor (MOV), diode for alternating current (DIAC), and / or silicon diode for alternating current (SIDAC)) and corresponding shunt diode rectifiers (SDRs) and placed in parallel across a capacitor structure to locally suppress voltage transients across the capacitor structure in excess of the voltage rating of the capacitor structure. The parallel shunting TVB / SDR pairs may be integrated into a printed circuit board (PCB) assembly that is externally attached to the capacitor structure or encapsulated in an enclosure incorporating the capacitor structure.
Owner:MJG INNOVATIONS LLC
Liquid-cooled grounded heatsink for diode rectifier system
InactiveUS20090052134A1Synchronous generatorsSemiconductor/solid-state device detailsEngineeringDiode rectifier
A diode rectifier system for generator excitation includes a plurality of diode modules mounted on a heatsink and a coolant tube provided in the heatsink. The heatsink is electrically grounded. A method of cooling a diode rectifier system for generator excitation comprises providing a flow of liquid coolant in the coolant tube and electrically grounding the heatsink.
Owner:GENERAL ELECTRIC CO
Energy-feedback tractive power supply system with high power factor and high cost performance
InactiveCN102328601AAchieving two-way flowSave electricityPower supply linesSingle network parallel feeding arrangementsContact networkRing network
The invention discloses an energy-feedback tractive power supply system with high power factor and high cost performance, relating to an energy-feedback tractive power supply system. The system comprises a main substation, a medium-voltage ring network, a first to an Nth energy-feedback tractive substations, a direct-current contact network and a steel rail. In the energy-feedback tractive substations, a set of 12-pulse-wave rectifier unit and a set of PWM (Pulse Width Modulation) unit are connected in parallel; by sufficiently utilizing respective advantages of the rectifier unit and the PWM unit, bidirectional flow of energy is realized on the one hand, braking energy of a train is fed back to an alternating-current grid, and electric energy is saved; on the other hand, the energy-feedback tractive power supply system integrates the advantages of simpleness and reliability, low cost and strong overload capability of a diode rectifier unit; beside, certain sensitive and capacitive reactive power is injected into the medium-voltage ring network by utilizing the PWM rectifier unit, and the power factor at the alternating-current incoming line of the main substation can be greatly increased. The whole tractive power supply system has higher cost performance.
Owner:BEIJING QIANSIYU ELECTRIC +1
Novel single-phase hybrid three-level rectifier
ActiveCN107896069AAchieve sinusoidalEasy sinusoidalAc-dc conversionThree levelSignal conditioning circuits
A new single-phase hybrid three-level rectifier comprises a single-phase uncontrollable diode rectifier bridge, a filter, a single-phase VIENNA rectifier bridge, a voltage and current sampling circuit, and a signal conditioning circuit. Through employing the above structure and a single-period control algorithm, the rectifier is simple in control method, is simple in structure, and just needs to collect an output voltage and an input current. The rectifier is very high in robustness, is high in power density, is large in power factor, is stable in output voltage, and is high in system reliability. Compared with a conventional single-phase rectifier, the rectifier provided by the invention can greatly improve the conversion efficiency, is large in application range, can greatly reduce the voltage stress of a power switching tube through employing the three-level structure, and can save a large amount of material resources and financial resources.
Owner:CHINA THREE GORGES UNIV
Wind turbine for producing electrical power and a method of operating the same
Owner:GE POWER CONVERSION
High-voltage inverter sharing direct current (DC) bus
InactiveCN103138675AMeet special requirementsParallel connectionAC motor controlCapacitanceFrequency changer
The invention relates to a high-voltage inverter sharing a direct current (DC) bus. The high-voltage inverter sharing the DC bus comprises a charging circuit, a phase-shifting transformer, three-phase diode rectifier bridges, a high voltage DC bus and an inverter based on multi-media card (MMC) topology. The primary side of the phase-shifting transformer is connected with a power grid through the charging circuit, each subsidiary side output winding of the phase-shifting transformer is connected with the three-phase diode rectifier bridge, the output capacitors of each diode rectifier are connected in series to form the high voltage DC bus, the high voltage DC bus is connected with the public DC end of one inverter or multiple inverters based on MMC topology, and the output ends of the inverters are connected the electric motor to be detected, and the mixed frequency test and the frequency control function of the electric motor is achieved. The topologic scheme of the high-voltage inverter sharing the DC bus meets the requirements of the electric motor test station of a weak grid end, multiple-unit output of the phase-shifting transformer with multiple windings is used, the DC bus formed by the series connection of the diode rectifying capacitors is used to store the energy extracted and fed back when the electric motor mixed frequency test is carried out, the energy is no longer loaded by the power grid, and therefore the pollution to the power grid caused by the electric motor test is eliminated.
Owner:LIAONING RONGXIN ZHONGTENG TECH
Non-contact electrical energy transmission device with self-adaptive power factor correction and control method
InactiveCN102130515ARealize functionHigh voltageElectromagnetic wave systemEfficient power electronics conversionConstant frequencyActive power factor correction
The invention discloses a non-contact electrical energy transmission device with self-adaptive power factor correction and a control method, the device adopts the AC (alternating current) / DC (direct current) / AC (alternating current) energy conversion way, the structure of a diode rectifier bridge plus a half-bridge double-switch is used for realizing the functions of active power factor correction and resonance inversion, and the structure of a three-order resonant network is further utilized for realizing the functions of reactive power compensation and load self-adaption. The control method of the device is simple, and only a driving signal with a constant frequency and constant duty cycle needs to be imposed on the half-bridge double-switch. The problems of small output power, great harmonic pollution, poor load applicability and the like in the non-contact electrical energy transmission technology can be solved by the device and the control method, and the device and the control method can be widely used in moving and lifting equipment of plants, mining and transporting equipment of coal mines, electrical power and subway locomotives, factories and mines with flammable and explosive gas and other various occasions.
Owner:SOUTHEAST UNIV
RFID transponder using ambient radiation
ActiveUS8373543B2Multiplex system selection arrangementsSubscribers indirect connectionTransmitted powerTrickle charging
Owner:RADIOFIDO
Gallium nitride based schottky diode with field plate structure
InactiveCN101752430AIncrease capacitance per unit areaImprove reverse breakdown voltageSemiconductor devicesOhmic contactGallium nitride
The invention discloses a gallium nitride based schottky diode with a field plate structure, wherein the periphery of a schottky metal electrode is provided with a layer of an insulating medium film, and the schottky metal electrode is extended to the upward side of the insulating medium film and covers part of the insulating medium film, namely a circle of metal-insulating medium layer-semiconductor (MIS) field plate structure is formed on the periphery of the schottky metal electrode; and the insulating medium layer of the field plate structure comprises at least one layer of an insulating material with a high dielectric constant, the thickness of the insulating material is between 0.01 and 2 microns, and the dielectric constant is bigger than 6. The gallium nitride based schottky diode comprises an ohmic contact layer, a GaN active layer, an insulating medium field plate, the schottky metal electrode and an ohmic contact electrode. Compared with a conventional structure device, a rectifier using the GaN schottky diode provided with the high dielectric constant material field plate has evener electric field distribution and higher reverse breakdown voltage.
Owner:NANJING UNIV
Environmentally friendly power supply
ActiveUS20110051476A1Resistive dissipation lossImprove leakage currentAc-dc conversion without reversalEfficient power electronics conversionCapacitanceConverters
A power supply for converting AC to a regulated DC output current, utilizing two serial switched mode power supplies, the first providing an intermediate DC output voltage with only moderate ripple properties, this output being input to the second, which operates as a DC / DC converter to provide the desired output with low ripple and good regulation. The diode rectifier assembly has no reservoir / smoothing capacitor, or one of much smaller capacitance than in prior art power supplies. The large resulting rectifier output ripple is overcome by use of the two power supply units, at least the first having a smoothing capacitor at its output. A majority of the energy stored in this capacitor is utilized during each AC half cycle. Such power supplies also provide improved hold-up times. The power supply is also constructed to have low standby power consumption, by use of a double burst configuration.
Owner:TOWER SEMICONDUCTOR
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