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33results about How to "Reduce the turns ratio" patented technology
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Multiphase soft switched DC/DC converter and active control technique for fuel cell ripple current elimination
ActiveUS7518886B1Cost size reductionElimination of voltage clampingDc-dc conversionDynamo-electric converter controlInner loopVoltage reference
DC / DC converter has a transformer having primary coils connected to an input side and secondary coils connected to an output side. Each primary coil connects a full-bridge circuit comprising two switches on two legs, the primary coil being connected between the switches on each leg, each full-bridge circuit being connected in parallel wherein each leg is disposed parallel to one another, and the secondary coils connected to a rectifying circuit. An outer loop control circuit that reduces ripple in a voltage reference has a first resistor connected in series with a second resistor connected in series with a first capacitor which are connected in parallel with a second capacitor. An inner loop control circuit that reduces ripple in a current reference has a third resistor connected in series with a fourth resistor connected in series with a third capacitor which are connected in parallel with a fourth capacitor.
Owner:VIRGINIA TECH INTPROP INC
High power factor isolated buck-type power factor correction converter
ActiveUS20090290384A1Improve power factorMinimize component stressDc network circuit arrangementsEfficient power electronics conversionFull waveTap changer
A regulated power factor corrected power supply apparatus is provided. The apparatus includes an input rectifier circuit for receiving an input AC voltage and outputting a full-wave rectified DC voltage. A single-stage isolated buck-type converter is coupled with the input circuit. The converter circuit comprises an isolated buck-type converter circuit including an isolation transformer. An output rectifier and semiconductor tap switch are coupled to a secondary winding of the isolation transformer. The tap switch couples a larger portion of the secondary winding to an output bulk capacitor during the portions of the input sinewave half-cycle, which are low in amplitude. The tap switch enables the single-stage isolation buck-type converter to operate over a much larger portion of the input sinewave, but also allows the converter to operate at high-efficiency over the majority of the input sinewave.
Owner:MYPAQ HLDG LTD
Isolated voltage regulator with one core structure
InactiveUS6853568B2Simplify input VRM designSimple designAc-dc conversion without reversalEfficient power electronics conversionBuck converterVoltage regulation
The present invention proposes a new structure for a high input VRM. This structure is similar to a simple buck converter and can simplify the 48V input VRM design. In this present invention, the interleaved voltage regulator is provided. The interleaved voltage regulator includes an integrated magnetic device for performing both transformer and output choke filter function, a first switch, a second switch, a third switch, and a fourth switch, wherein the integrated magnetic device includes a transformer having a first primary winding, a second primary winding, a first secondary winding, and a second secondary winding, a first choke filter having one end coupled to a first terminal of the first secondary winding, and a second choke filter having one end coupled to a first terminal of the second secondary winding, and the other end of the second choke filter coupled to the other end of the first choke filter to form the output terminal of the isolated voltage regulator. The first switch, the second switch, the first choke filter, and the first secondary winding form a synchronous rectifier circuit. The third switch, the fourth switch, the second choke filter, and the second secondary winding form another synchronous rectifier circuit.
Owner:DELTA ELECTRONICS INC
Charge equalization apparatus with parallel connection of secondary windings of multiple transformers
ActiveCN101467324AImprove balanceImprove uniformityCharge equalisation circuitElectric powerTransformerEngineering
The present invention relates, in general, to a charge equalization apparatus with series-connected battery cells and, more particularly, to a charge equalization apparatus, in which series-connected battery cells (Bl to BN) are connected in parallel with the primary windings (Mi l to MlN) of transformers (Tl to TN), switches (Sl to SN) for controlling the flow of current of the primary windings are connected in series with the primary windings (Ml 1 to MlN), and multiple secondary windings (M21 to M2N) corresponding to the primary windings are connected in parallel with each other.
Owner:SK ON CO LTD +1
Push-pull converter with voltage multiplying resonance capability
InactiveCN103078514AHigh gainReduce the turns ratioEfficient power electronics conversionDc-dc conversionCapacitancePush pull
The invention discloses a push-pull converter with voltage multiplying resonance capability. The push-pull converter comprises a primary side push-pull circuit, an isolation transformer, a secondary side voltage multiplying circuit and a secondary side resonance circuit. The push-pull converter has the advantages that on the basis of omitting the filter inductance, the secondary side utilizes the voltage multiplying structure, the gain of the converter is improved, the goal that the number of turns of the transformer is reduced to one half of the number of the original turns under the condition with the same voltage boosting ratio, and the size and the weight of the transformer are effectively reduced; in addition, a voltage multiplying capacitor also participates in the resonance of the secondary side equivalent leakage inductance of the transformer, the zero-current shutoff of a secondary side rectifier diode is realized, the reverse recovery problem of the rectifier diode is solved, the loss is reduced, and the integral efficiency of the converter is improved; and meanwhile, the primary side adopts the minimum element number, one capacitor and one group of transformer windings are reduced by the secondary side, miniaturization and light weight of the converter are realized, and in addition, the cost of the converter is reduced.
Owner:ZHEJIANG UNIV
Multi-unit diode capacitor network and coupling inductor high-gain DC converter
ActiveCN105958816AReduce voltage stressReduce volumeEfficient power electronics conversionApparatus without intermediate ac conversionCapacitanceNew energy
The invention discloses a multi-unit diode capacitor network and coupling inductor high-gain DC converter. The main circuit topology fully combines the characteristics of a multi-winding coupling inductor and a diode capacitor boost network, and the converter has the following remarkable advantages: 1), improving the voltage gain, and reducing the voltage stress of a power device; 2), achieving zero output voltage ripple, and remarkably reducing the demands of an LC filter; 3), reducing the turn ratio of a coupling resistor, reducing the size of a magnetic element, and improving the power density; 4), inhibiting the turn-off voltage peak of a switching tube, reducing the switching loss, and improving the electric energy conversion efficiency; 5), achieving the modular design of a basic boost unit, and achieving high flexibility. The converter is good in application prospect in a new energy distributed power generation system.
Owner:邳州德好农产品加工有限公司
Power transmission system and power transmitting apparatus
InactiveUS20130334893A1Small sizeReduce parasitic capacitanceNear-field transmissionElectromagnetic wave systemElectric power transmissionCapacitance
A power transmitting apparatus includes a power transmitting circuit, a passive electrode, and an active electrode. A capacitor represents a capacitance generated by the passive electrode and the active electrode. A voltage step-up circuit and the capacitor form a resonant circuit. The voltage step-up circuit formed of the step-up transformer and the inductor steps up a voltage generated by a voltage conversion circuit and applies the stepped up voltage between the passive electrode and the active electrode. A control IC performs PWM control of the voltage conversion circuit by comparing a rectified and smoothed voltage of a third winding of the step-up transformer with a reference voltage. As a result, an output voltage applied to the load circuit of a power receiving apparatus is stabilized without causing the power receiving apparatus to become complex or large.
Owner:MURATA MFG CO LTD
Single-stage photovoltaic grid-connected micro inverter and control method thereof
InactiveCN107517020AReduce distortion rateImprove efficiencyAc-dc conversionSingle network parallel feeding arrangementsAlternating currentPulse sequence
The invention belongs to the technical field of electricity and relates to a single-stage photovoltaic grid-connected micro inverter and a control method thereof. The primary side of an isolation transformer achieves bidirectional excitation only through one switch tube, and the switch tube can achieve zero-voltage connection and disconnection and at the meantime transmit energy to the secondary side of the isolation transformer; the secondary side of the isolation transformer comprises two sets of high-frequency full-wave rectification circuits, which are controlled to output at a power frequency and then connected in parallel back to back, and is combined with modulation of a high-frequency switch tube of the primary side of the isolation transformer to form a pulse sequence changing by sinusoidal modulation rules and then filtered into grid-connectable power-frequency alternate current. The single-stage photovoltaic grid-connected micro inverter is simple in structure, small in size, low in cost and high in efficiency and reliability, and can be applied to other small grid-connected inverters besides photovoltaic grid-connected micro inverters; after island detection and phase lock programs are eliminated, the single-stage photovoltaic grid-connected micro inverter can be applied in a generalized mode to vehicle-mounted inverters, USB (universal serial bus) power sources, frequency converters and isolated boost DC-AC (direct current-alternate current) converters.
Owner:QINGDAO UNIV
Novel high-voltage gain mixing direct-current converter for photovoltaic grid-connected micro-inverter
InactiveCN103280976ASimple structureImprove conversion efficiencyDc-dc conversionPhotovoltaic energy generationCapacitanceLeakage inductance
The invention discloses a novel high-voltage gain mixing direct-current converter for a photovoltaic grid-connected micro-inverter. The novel high-voltage gain mixing direct-current converter consists of an improved novel voltage-multiplying boost converter and a flyback converter and aims at realizing high voltage gain of the converter and reducing the voltage stress of power devices. Since two circuits adopt one input end, the circuit structure is simplified; the output ends of the two circuits are in serial connection with each other to supply the power, so that the overall voltage gain of the mixing converter can be remarkably improved. Through the voltage-multiplying circuit, the voltage gain outputted by the traditional boost circuit can be multiplied, the turn ratio of a transformer in the flyback converter can be reduced, and the reversed blocking voltage stress of an output diode D4 can be effectively alleviated; the leakage inductance energy of the transformer can be recycled through the voltage-multiplying boost circuit, and the system efficiency can be improved; the voltage stress of the main power device can be reduced through a capacitor clamping circuit in the circuit.
Owner:JIANGSU UNIV
High-voltage transformation ratio bidirectional DC converter and control method thereof
InactiveCN103337961AImprove electromagnetic compatibilityReduce volumeDc-dc conversionElectric variable regulationLow voltageFull bridge
The invention discloses a high-voltage transmission ratio bidirectional DC converter and a control method thereof. The high-voltage transmission ratio bidirectional DC converter mainly comprises a high-voltage side three-phase full-bridge consisting of six switch tubes, a Y-delta shaped three-phase transformer and a low-voltage side three-phase bridge arm consisting of three filtering inductors and three switch tubes. The invention also provides a control method of the high-voltage transmission ratio bidirectional DC converter. The internal characteristics and the control mode of the Y-delta shaped three-phase transformer are utilized to improve the voltage transformation ratio by one time in comparison with a traditional bidirectional DC converter, so that the turn ratio of the transformer is reduced by one time, and the leakage inductance is greatly reduced, the electromagnetism compatibility of the transformer is improved. The low-voltage side three-phase inductors are parallelly connected in a staggered manner, and the output current ripple is greatly reduced after the three-phase current ripples are stacked, so that the service life of a storage battery can be favorably prolonged, and the size of a filter is favorably reduced. The high voltage side and the low voltage side both adopt the three-phase staggered shunt-wound structure, so that the current stress of the switch tubes is reduced and suitable switch tubes can be conveniently selected for high-power application occasions.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Multi-unit coupled inductor switch capacitor network high-gain direct-current converter
ActiveCN107733221AImprove conversion efficiencySimple structureEfficient power electronics conversionApparatus without intermediate ac conversionCapacitanceNew energy
The invention discloses a multi-unit coupled inductor switch capacitor network high-gain direct-current converter. The converter comprises an input end power supply V<in>, a controllable switching tube S, a secondary side multi-winding coupled inductor, multiple two-port diode capacitor voltage-boosting units, a diode D, an output capacitor C and an output end load RL; the main circuit topology, by fully combining the characteristic of the multi-winding coupled inductor and the diode capacitor voltage-boosting units, overcomes the inherent defects of the impact current of a diode capacitor network, so that the voltage gain is obviously improved, the voltage stress of the switching tube is lowered, natural switch-off of all diodes is realized, the switching loss is lowered, and electric energy conversion efficiency is improved; and the multi-unit coupled inductor switch capacitor network high-gain direct-current converter has wide application prospect in a new energy distributed type power generation system.
Owner:XI AN JIAOTONG UNIV
AC/DC power supply system and control method thereof
InactiveCN109617431AHigh efficiency at low pressureReduce the size of the inductorEfficient power electronics conversionAc-dc conversionCapacitanceControl signal
The invention discloses an AC / DC power supply system which comprises an AC power supply, a power factor correction (PFC) circuit, a control circuit, a bus capacitor, a switching circuit, a DC / DC isolating power stage, an output capacitor and an output load, wherein inputs of a PFC module are the AC power supply; an output of the PFC module is bus voltage; an input of the switching circuit is the bus voltage; outputs of the switching circuit are four terminals; the terminals by two groups are respectively connected with two input ends of a DC / DC module; and output ends of the DC / DC module are connected in parallel, and supply power to the output capacitor and the load. The control circuit sets output voltage of the PFC module according to an effective value or a peak value of detected inputvoltage, and controls operation of the PFC circuit according to a detection signal Vbus_s and a PFC sampling signal, so that a PFC function and bus voltage Vbus stabilization are achieved. In addition, the control circuit controls the switching circuit to change a connection manner of the DC / DC module according to an effective value or a peak value of detected input voltage, or directly changes an operation mode of backward-stage DC / DC by a control signal, so that the power supply system operates in an optimal operation state.
Owner:MORNSUN GUANGZHOU SCI & TECH
New type non-filament florescent lamp working in brightness arc transition zone
InactiveCN101202198AImprove reliabilityExtend your lifeElectric lighting sourcesVacuum evaporation coatingSurface brightnessInsulation layer
The invention relates to a novel wireless fluorescent lamp which works in a bright arc transition zone, comprising a lamp tube, an electrode, a drive, a lamp casing and a lamp cup or lampshade. The electrode consists of tungsten, or molybdenum or iron. More than one layers of anti cathode sputtering films are arranged on the surface of the electrode. Super-pure argon air is filled into the lamp tube with an air-filling pressure ranging from 800 Pa to 6665Pa. The work current of the lamp tube is between 7MA and 60MA. A cold end is arranged in the lamp tube and a titanium mercury zirconium aluminum 16 alloy amalgam or an indium mercury zirconium aluminum 16 alloy amalgam is arranged in the cold end. An insulation layer is arranged between the lamp cup or lampshade and the lamp casing. The cold end extends from the lamp cup or lampshade to the insulation layer. The invention enhances light effect and surface brightness, and has small volume, high flux, enhanced reliability and long service life. The manufacture of the drive is easy, the manufacturing cost is low and the cost performance is high, furthermore, the proposal of the EMC is easy, the cost for restraining electromagnetic interference wires is low and the effect for restraining electromagnetic interference is good.
Owner:陈宗烈
Monopole-type photovoltaic off-network inverter and control method thereof
ActiveCN107332453AEasy to controlReduce volumeEfficient power electronics conversionSingle network parallel feeding arrangementsFull waveEngineering
The invention belongs to the technical field of electricity, and relates to a monopole-type photovoltaic off-network inverter and a control method thereof. The original side of an isolation transformer achieves bidirectional transformer excitation through a switching tube, the switching tube can achieve no-voltage switching-on and no-voltage switching-off, and meanwhile, during switching-on and switching-off periods, power can be supplied to the secondary side of the transformer; the secondary side of the transformer adopts two high-frequency full-wave rectification circuits, and by controlling the two circuits to output according to a power frequency and then switch to an inverse-parallel connection mode, the modulation of the high-frequency switching tube of the original side of the transformer is combined to form an impulse sequence capable of changing according to a sinusoidal modulation rule, wherein the impulse sequence is changed to 220V alternate current with a power frequency after smoothing. The circuit structure of the monopole-type photovoltaic off-network inverter is simple, small in size, low in cost, easy to control and high in reliability, and can not only be specially used in small photovoltaic off-network inverters, but popularized and applied to other small off-network inverters, vehicle-mounted inverters, UPS power sources, transducers and DC-AC convertors for insolation and pressure boosting.
Owner:QINGDAO UNIV
Single-stage-type photovoltaic off-grid inverter with high frequency rectification control and control method thereof
ActiveCN107453630AStable output voltageReduce volumeEfficient power electronics conversionPhotovoltaic energy generationSwitching frequencyConductor Coil
The invention belongs to the electrical technology field and relates o a single-stage-type off-grid inverter with high frequency rectification control and a control method thereof. On a primary side of a transformer, one switch tube is used to realize solar photovoltaic inversion, and the switch tube simultaneously is used to realize zero voltage opening and closing and make an isolation transformer realize bidirectional excitation. Two sets of high frequency rectification control circuits of a secondary side of the transformer make that an unsymmetrical voltage output by a secondary side winding of the transformer is effectively used. Through controlling a conduction duty ratio of a high frequency switch tube, MPPT is realized. A controllable inversion switch tube of the secondary side of the transformer carries out power-frequency alternative conduction. A resonant capacitor which is parallel to the primary side of the transformer and a transformer primary side inductor carry out resonance so that a high voltage gain exists between output and input of the inverter, and through changing a switch frequency of a primary side switch tube, adjustment can be performed. The structure of the circuit is simple, the size is small, cost is low, efficiency is high, the inverter is easy to control, reliability is high and the inverter can be widely applied.
Owner:QINGDAO UNIV
Isolated voltage regulator with one core structure
ActiveCN1324797CReduce the turns ratioEnhanced couplingEfficient power electronics conversionApparatus with intermediate ac conversionVoltage regulationEngineering
Owner:DELTA ELECTRONICS INC
A switch converter
InactiveCN108988647AReduce the turns ratioReduce the number of layersDc-dc conversionElectric variable regulationActive clampEngineering
The invention provides a switching converter, which adopts a large leakage inductance transformer to form an active clamp forward circuit, and the ratio of the leakage inductance and the excitation inductance of the transformer T is greater than 0.05. By adopting the transformer leakage inductance as filtering inductance, in addition to saving the volume and cost of the output filter inductance, the leakage inductance of the transformer can withstand a part of the input voltage when the circuit works, which can reduce the turn ratio of the transformer and provide a basis for reducing the number of turns of the winding. If the leakage inductance of the transformer is insufficient, the leakage inductance can also be increased by means of external inductance.
Owner:MORNSUN GUANGZHOU SCI & TECH
Modularized photovoltaic direct current boost converter with low input current ripple, high gain and low loss
PendingCN114785145AReduce lossHigh gainDc-dc conversionSingle network parallel feeding arrangementsFull bridgePower balancing
The invention discloses a low-input-current-ripple high-gain low-loss modular photovoltaic direct-current boost converter, and belongs to the technical field of power generation, power transformation or power distribution. The converter comprises N isolated photovoltaic sub-modules and N-1 LC power balancing units. The isolated photovoltaic sub-module comprises a photovoltaic cell panel and a current source type dual-active bridge converter with a buck-boost characteristic, the current source type dual-active bridge converter with the buck-boost characteristic is adopted to reduce input and output current ripples, the voltage gain is high, and the isolated photovoltaic sub-module is suitable for a wide voltage gain occasion. And the loss of the converter is greatly reduced due to relatively small current stress and soft switching working characteristics. The photovoltaic sub-modules reuse devices in secondary full-bridge circuits, independent MPPT control of the photovoltaic sub-modules is realized by controlling a phase shift angle between primary and secondary circuits, power transmission between adjacent sub-modules is realized by controlling a phase shift angle between secondary full bridges of the adjacent sub-modules, and power balance between the sub-modules is realized. The number of used switching devices is reduced, and cost is greatly reduced.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
A single-stage photovoltaic off-grid inverter and its control method
ActiveCN107332453BEasy to controlReduce volumeEfficient power electronics conversionSingle network parallel feeding arrangementsGrid-tie inverterFull wave
The invention belongs to the field of electrical technology, and relates to a single-stage photovoltaic off-grid inverter and a control method thereof. A switch tube is used on the primary side of the isolation transformer to realize two-way excitation of the transformer, and the switch tube can realize both zero-voltage turn-on and zero-voltage switching. The voltage is turned off, and energy can be transmitted to the secondary side of the transformer during the turn-on and turn-off periods; the secondary side of the transformer adopts two sets of high-frequency full-wave rectification circuits, which are controlled to output according to the power frequency, and then connected in reverse parallel, combined with the high-frequency switch on the primary side of the transformer The modulation of the tube forms a pulse sequence that changes according to the law of sinusoidal modulation, and becomes a power frequency 220V AC after filtering; its circuit structure is simple, small in size, low in cost, high in efficiency, easy to control, and high in reliability. In addition to small off-grid inverters, it can also be applied to other small off-grid inverters, vehicle-mounted inverters, UPS power supplies, frequency converters, and isolated step-up DC-AC converters.
Owner:QINGDAO UNIV
Fast and reliable combustion-supporting circuit of direct current magnetron sputtering coating power supply
The invention belongs to the technical field of automatic control and power electronics, and particularly relates to a fast and reliable combustion-supporting circuit of a direct current magnetron sputtering coating power supply. By adding a combustion-supporting circuit, the voltage output by the combustion-supporting circuit is superposed with the voltage output by a high-frequency rectifier bridge of a high-frequency inverter switching power supply to reach the amplitude of the combustion-supporting starting voltage; when the starting is successful, the output current of the direct currentmagnetron sputtering power supply exceeds a starting success determination threshold value, or the output voltage of the direct current magnetron sputtering power supply is lower than a no-load voltage determination threshold value of a main power supply, the combustion-supporting circuit stops working, and the voltage and the current required by the direct current magnetron sputtering process aresupplied by the main circuit of the direct current magnetron sputtering coating power supply; once the glow is extinguished, the combustion-supporting circuit is started to output, and the output voltage of the power supply reaches the amplitude of the combustion-supporting starting voltage, so that the continuity of the coating process is ensured; and the arc energy is reduced, and the coating quality is improved.
Owner:中核同创(成都)科技有限公司
Device and method for converting voltage using switch mode
This invention relates to a device and a method for converting voltages by a switch mode, in which, the device includes a switch supply, an inductor, diodes and capacitors, and the inductor includes a primary coil and a secondary coil coupled to each other, both ends of the secondary coil are parallel to two branches with two diodes serial to capacitors to commutate and filter the positive and negative induced voltages to form a DC supply, which can be laminated to generate a voltage meeting the requirement.
Owner:SHENZHEN TCL NEW-TECH CO LTD
A High-Gain Full-Bridge Isolated DC Converter with Multi-unit Diode Capacitor Network
ActiveCN106059306BReduce the turns ratioReduce voltage stressEfficient power electronics conversionDc-dc conversionCapacitanceTransformer
The present invention discloses a multi-unit diode capacitor network high-gain full-bridge isolated direct current converter. A transformer T is connected with an excitation inductor Lm in parallel and is connected with the leakage inductor Lk equivalent to the edge in series; an LC filtering circuit is composed of a filtering circuit Lf and a filtering capacitor Cf; and the anode of an input power supply Vdc is connected with the direct current side anode of a full-bridge inversion circuit, the cathode of the input power supply Vdc is connected with the cathode of the full-bridge inversion circuit direct current side, and a boost full-bridge inversion circuit is formed. The multi-unit diode capacitor network high-gain full-bridge isolated direct current converter can improve the voltage gain, obtain high voltage gain, reduce the voltage stress of a power device, reduce the turn ratio of a transformer, reduce the size of a magnetic element and improve the power density. The multi-unit diode capacitor network high-gain full-bridge isolated direct current converter employs the transformer leakage inductor and the circuit resonance to realize the zero current switching (ZCS) of a main power device to reduce the switch loss and improve the electric energy transition efficiency. The multi-unit diode capacitor network high-gain full-bridge isolated direct current converter has a wide application prospect in a new energy distributed power generation system.
Owner:山东隽宇电子科技有限公司
A control method for a high voltage ratio bidirectional DC converter
InactiveCN103337961BImprove electromagnetic compatibilityReduce volumeDc-dc conversionElectric variable regulationHigh voltage igbtLow voltage
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
A voltage doubler soft switching push-pull DC converter
ActiveCN105141138BReduce the turns ratioReduce volumeEfficient power electronics conversionDc-dc conversionCapacitanceSoft switching
The invention discloses a voltage-doubling type soft switching push-pull DC converter, which structurally comprises a DC voltage source Vin(1), first, second and third power transistors S1, S2, S3 (2) with anti-parallel diodes and junction capacitors, a high-frequency isolation transformer Tr(3), a voltage-doubling rectifying circuit (4), a capacitor filtering circuit and an output load (5), wherein the high-frequency isolation transformer Tr (3) comprises a primary-side first winding NP1, a primary-side second winding NP2 and a secondary-side winding Ns. According to the invention, a filter inductor is removed from the converter, thereby being conducive to reducing the size and the weight of the converter; a voltage-doubling rectification structure is adopted to improve step-up ratio of the converter, the turn ratio of the high-frequency isolation transformer is reduced under the same input / output voltage level, and the size and the weight of the transformer are reduced; the power transistors of the converter can realize zero-voltage turn-on and turn-off, thereby reducing the switching loss; and the rectifier diode is zero-current turn-off, thereby solving problems of voltage stress and loss brought about by reverse recovery of the diode, and improving the work efficiency of the converter.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Device and method for converting voltage using switch mode
This invention relates to a device and a method for converting voltages by a switch mode, in which, the device includes a switch supply, an inductor, diodes and capacitors, and the inductor includes a primary coil and a secondary coil coupled to each other, both ends of the secondary coil are parallel to two branches with two diodes serial to capacitors to commutate and filter the positive and negative induced voltages to form a DC supply, which can be laminated to generate a voltage meeting the requirement.
Owner:SHENZHEN TCL NEW-TECH CO LTD
A High Power Density AC Large Current Generator
InactiveCN104578820BHigh voltage regulation accuracy requirementsFlat exteriorAc-dc conversionDc-dc conversionThree levelLow voltage
The invention discloses a high-power-density alternating-current strong current generator. According to the generator, a power electronic technology is provided for being used for achieving high-current adjustable output, power density and the power factor can be greatly improved, automatic high-precision adjustment can be achieved, carrying and use are convenient, the service life is prolonged, and reliability is improved. A three-level structure is adopted, a Boost PFC is arranged on the first level, an LLC is arranged on the second level, and an interleaving full-bridge inverter is arranged on the third level. The first level is mature in technology. The second level is high in input voltage, low in output voltage and high in current, and the structure that the primary sides of multiple transformers are connected in series, and secondary sides are connected in parallel is adopted. The third level belongs to low-voltage input and lower-voltage high-current output, output current waveform quality is guaranteed through a carrier staggering method, and the conversion efficiency of the convertor on this level is improved.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
A Multi-unit Coupled Inductor Switched Capacitor Network High Gain DC Converter
ActiveCN107733221BImprove conversion efficiencySimple structureEfficient power electronics conversionApparatus without intermediate ac conversionCapacitanceNew energy
The invention discloses a multi-unit coupled inductance switched capacitor network high-gain DC converter, which includes an input power supply V in , a controllable switch tube S, a coupled inductor with multiple windings on the secondary side, multiple two-port diode capacitor boost units, a diode D, an output capacitor C, and an output load R L ;The main circuit topology fully combines the characteristics of the multi-winding coupled inductor and the diode capacitor boost unit, overcomes the inherent defect of the diode capacitor network inrush current, significantly improves the voltage gain, reduces the voltage stress of the switch tube, and realizes the natural shutdown of all diode capacitors , reduce switching loss, improve power conversion efficiency, and multi-unit coupled inductor switched capacitor network high-gain DC converter has broad application prospects in new energy distributed power generation systems.
Owner:XI AN JIAOTONG UNIV
LCD backlighting inverter circuit and LCD
InactiveCN100381022CEliminate limitations in boot performanceEliminate limitationsElectrical apparatusElectric lighting sourcesOutput transformerResonant inverter
An improved electronic LCD backlighting inverter circuit for high frequency operation under low frequency pulse width modulation (PWM) for dimming control. The improved electronic LCD backlighting inverter is based on a voltage-fed push-pull LLC resonant inverter circuit configuration including a resonant inductor (L), magnetizing inductance of an output transformer (L), and resonant capacitor (C). For large values of magnetizing inductance the LLC circuit effectively becomes an LC resonant circuit. By synchronizing the high frequency switching signal and the low frequency modulation frequency using logic control circuitry, a wide dimming range and higher efficiency are achieved under PWM control.
Owner:KONINKLIJKE PHILIPS ELECTRONICS NV
High gain and high power density converter and commutation method for high and low voltage sides thereof
PendingCN108667310AReduce switching lossesImprove efficiencyEfficient power electronics conversionDc-dc conversionLow voltageEngineering
The invention discloses a high gain and high power density converter and commutation method for high and low voltage sides thereof. The high gain and high power density converter comprises a first setof coupled inductors, a second set of coupled inductors, a low voltage side circuit of the converter, and a high voltage side circuit of the converter. The high gain and high power density convertercan achieve zero voltage turning-off and zero current turning-on of all power switch tubes, which is similar to zero voltage turning-on. During the high-voltage side forward and reverse charging and discharging, a secondary side winding is shared, controllable power switch tube are used instead of forward and reverse charging diodes, and the output voltage is flexibly controlled by controlling a duty ratio of the controllable power switch tube, thereby broadening the control range and flexibility of the load output voltage; reducing circuit components, simplifying the structure, improving thepower density and reliability, and reducing costs.
Owner:GUANGZHOU INST OF TECH
New type non-filament florescent lamp working in brightness arc transition zone
InactiveCN101202198BImprove reliabilityExtend your lifeElectric lighting sourcesVacuum evaporation coatingSurface brightnessInsulation layer
The invention relates to a novel wireless fluorescent lamp which works in a bright arc transition zone, comprising a lamp tube, an electrode, a drive, a lamp casing and a lamp cup or lampshade. The electrode consists of tungsten, or molybdenum or iron. More than one layers of anti cathode sputtering films are arranged on the surface of the electrode. Super-pure argon air is filled into the lamp tube with an air-filling pressure ranging from 800 Pa to 6665Pa. The work current of the lamp tube is between 7MA and 60MA. A cold end is arranged in the lamp tube and a titanium mercury zirconium aluminum 16 alloy amalgam or an indium mercury zirconium aluminum 16 alloy amalgam is arranged in the cold end. An insulation layer is arranged between the lamp cup or lampshade and the lamp casing. The cold end extends from the lamp cup or lampshade to the insulation layer. The invention enhances light effect and surface brightness, and has small volume, high flux, enhanced reliability and long service life. The manufacture of the drive is easy, the manufacturing cost is low and the cost performance is high, furthermore, the proposal of the EMC is easy, the cost for restraining electromagnetic interference wires is low and the effect for restraining electromagnetic interference is good.
Owner:陈宗烈
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