Product
Patsnap Eureka
For R&D, Patsnap Eureka makes reading and utilizing patents & technical documents easy.
Patsnap Eureka AIR
Designed for self-driven R&D workflows. Generate viable solutions, solve complex R&D challenges, empower your innovation with AI.
Patsnap Eureka Materials
Designed for material experts only. Revolutionize your material R&D, from search, analyze, to developing new materials.
Feature
TechResearch
Generate reliable direction feasibility study reports for your R&D in just a few steps.
TechSeek
Discover and master advanced knowledge NOW. Basics, ideas, possibilities, all at once.
TechMind
As an expert in R&D Theories, TechMind can generates customized viable solutions instantly.
TechRisk
Analyze your overall solution with one click, know your potential R&D risks in advance.
TechMonitor
Get weekly tech updates, stay abreast of the latest tech innovations and key insights.
Patents
Literature
Hiro is an intelligent assistant for R&D personnel, combined with Patent DNA, to facilitate innovative research.
48results about How to "Reduce switch stress" patented technology
Efficacy Topic
Property
Owner
Technical Advancement
Application Domain
Technology Topic
Technology Field Word
Patent Country/Region
Patent Type
Patent Status
Application Year
Inventor
Modular contactor assembly having independently controllable contractors
InactiveUS7196434B2Reduce switch stressCircuit-breaking switches for excess currentsBoards/switchyards circuit arrangementsContactorSingle line
The present invention provides an electrical isolation apparatus having independently controllable contactors. The isolation apparatus includes a contactor for each phase or pole of an electrical device as well as each phase or pole of a load. Each contactor is constructed so that each includes multiple contact assemblies that may be independently controlled to open and close. Moreover, the contactors within a single contactor assembly or housing can be independently controlled so that the contacts of one contactor can be opened without opening the contacts of the other contactors in the contactor assembly. Additionally, the contactors are constructed and controlled such that a single line side contactor and a single load contactor open simultaneously when an open circuit condition is desired.
Owner:EATON INTELLIGENT POWER LTD
System and method for modularizing battery pack balancer based on multi-winding transformers
ActiveCN106787021AAchieve direct equalizationImprove uniform efficiencyCharge equalisation circuitElectric powerControl signalModularity
The invention discloses a system and a method for modularizing a battery pack balancer based on multi-winding transformers. Through anti-parallel connection of secondary sides of an odd number and an even number of the multi-winding transformers, balancing in modules and between the odd / even number of modules is realized based on forward conversion; the balancing between the odd number and the even number of the modules and the automatic demagnetization of the multi-winding transformers are realized based on flyback conversion; during control, direct, automatic and synchronous balancing from any battery monomer to any battery monomer in a battery pack can be realized just by a pair of control signals which are complementary in states, so that the balancing efficiency and the balancing speed are greatly increased, and the inconsistency between battery monomers can be effectively improved. The system and the method, disclosed by the invention, have the advantages that the balancing efficiency is high, the balancing speed is fast, the volume is small, the cost is low, the reliability is high, modularization is easy, the control is simple, a voltage detection circuit and a demagnetization circuit are not required, and the like.
Owner:SHANDONG UNIV
Mixed micro-grid system of large-scale energy recycling power battery pack test device
InactiveCN103956761ASimple topologyReduce switch stressElectrical testingAc network load balancingTest powerPower battery
The invention discloses a mixed micro-grid system of a large-scale energy recycling power battery pack test device. The mixed micro-grid system comprises a tested power battery pack and an alternating-current grid, and further comprises a test unit, a direct-current voltage-variable unit, an alternating-current voltage-variable unit, a direct-current bus and an energy storage unit. The test unit is connected between the power battery pack and the direct-current bus and comprises a bidirectional DC / DC conversion assembly which is used for enabling the voltage in the power battery pack to be matched with the voltage in the direct-current bus. The mixed micro-grid system has the advantages that a power battery pack test grid-connected alternating-current micro-grid power generation system generally adopted in current power battery pack manufacturers is changed through the mentioned components of the system; the design of a test device converter is facilitated, in other words, the test device converter is mainly composed of a one-stage converter instead of a two-stage converter and a filter in the prior art; meanwhile, the energy storage battery pack and a super-capacitor set are arranged, and therefore stability of the voltage of the direct-current bus of the high and low voltage side in a direct-current micro-grid is ensured, and energy supplementing and supporting are achieved.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Modular contactor assembly having independently controllable contactors
InactiveUS20060274459A1Reduce switch stressCircuit-breaking switches for excess currentsBoards/switchyards circuit arrangementsContactorSingle line
The present invention provides an electrical isolation apparatus having independently controllable contactors. The isolation apparatus includes a contactor for each phase or pole of an electrical device as well as each phase or pole of a load. Each contactor is constructed so that each includes multiple contact assemblies that may be independently controlled to open and close. Moreover, the contactors within a single contactor assembly or housing can be independently controlled so that the contacts of one contactor can be opened without opening the contacts of the other contactors in the contactor assembly. Additionally, the contactors are constructed and controlled such that a single line side contactor and a single load contactor open simultaneously when an open circuit condition is desired.
Owner:EATON INTELLIGENT POWER LTD
Control circuit for three-phase high power factor rectifier
InactiveCN103166489ASimple control methodReduce the amount of detectionEfficient power electronics conversionAc-dc conversionInterference resistanceInductor
The invention discloses a control circuit for a three-phase high power factor rectifier, and belongs to the field of electrical control. The control circuit comprises an input high-frequency filter circuit, a three-phase input inductor, a three-phase rectifier circuit, a switch tube power circuit, an output rectifier filter circuit, a voltage-dividing detection circuit, an input current detection unit, a single cycle controller and a switch tube driving circuit. A three-phase high power factor can be rectified, high-precision stable output voltage can be obtained, and interference resistance is high.
Owner:YANGZHOU XINHAO HEAVY MACHINERY
Novel zero-sequence current compensator
InactiveCN101860036AAchieving two-way flowImprove voltage qualityPolyphase network asymmetry elimination/reductionPolyphase network asymmetry reductionCurrent channelCompensation effect
The invention provides a novel zero-sequence current compensator. An inverter bridge is connected between a neutral point and a neutral line of a zigzag transformer; and a current output by the inverter bridge is injected into a system through a low-impedance zero-sequence current channel which is provided by the zigzag transformer so as to compensate for a neutral current. A controllable rectifier module is connected with the secondary side of the zigzag transformer to supply a direct-current power supply to the inverter bridge, and thus, the two-way flow of energy is realized and the problem of direct-current voltage rise caused when the compensator absorbs active power is solved. The novel zero-sequence current compensator has a series of advantages of good compensation effect, low direct-current voltage, small switching stress, few influences of system parameters, flexible control, few influences on system operation and the like.
Owner:STATE GRID JIANGSU ELECTRIC POWER CO LIANYUNGANG POWER SUPPLY CO +1
High efficiency half-bridge DC/DC convertor
InactiveCN1893250AReduce switch stressElectronic switchingApparatus with intermediate ac conversionRectifier diodesSwitching signal
In the DC / DC converter, a switching part has first and second switches serially connected from a power supply to a ground. The first and second switches switch on / off in response to first and second switching signals having a fixed frequency. The first switching signal has a phase level that does not overlap a corresponding phase level of the second switching signal. A transformer transforms a voltage applied to a first winding into a second winding in response to switching operation of the switching part, and resonates by an inductor and a capacitor of the first winding. Also, a rectifier includes a rectifying diode for rectifying the voltage from the transformer into a direct voltage. A feedback circuit detects the voltage outputted via the rectifier. Additionally, a controller controls pulse width of the first and second switching signals in a PWM mode according to the voltage detected by the feedback circuit.
Owner:SAMSUNG ELECTRO MECHANICS CO LTD
High-frequency high-transformation-ratio bidirectional DC/DC converter based on coupled inductors
InactiveCN109980934AReduce switch stressAchieve zero voltage turn-onEfficient power electronics conversionDc-dc conversionEngineeringCoupling inductor
The invention relates to a high-frequency high-transformation-ratio bidirectional DC / DC converter based on coupled inductors, belongs to the technical field of power electronics and solves the problems that an existing non-isolated bidirectional DC / DC converter is high in switching stress and low in system efficiency. The DC / DC converter comprises a first filter unit, a boost-buck unit and a second filter unit. The first filter unit and the second filter unit are used for input filtering and output filtering of the boost-buck unit. The boost-buck unit comprises a coupled inductor L1, a coupledinductor L2, a resonant capacitor Cr, a switching tube S1, a switching tube S2 and a switching tube S3, and the switching tube S1, the switching tube S2 and the switching tube S3 are respectively provided with a body diode. The coupled inductor L1, the coupled inductor L2, the switching tube S1 and the switching tube S3 form a coupled inductor type boost circuit. The resonant capacitor Cr and leakage inductances of the two coupled inductors form an LC series resonant unit, and the LC series resonant unit, the switching tube S2 and the switching tube S3 form a half-bridge converter topology structure.
Owner:HARBIN INST OF TECH
Deadbeat current control method for adding zero vector for grid-connected inverter
InactiveCN102148580AInhibition rate of changeRate-of-change limitSingle network parallel feeding arrangementsDc-ac conversion without reversalGrid-tie inverterControl system
The invention discloses a deadbeat current control method for adding a zero vector for a grid-connected inverter. A single-phase photovoltaic grid-connecting inversion system is composed of a photovoltaic array, a voltage-type invertible PWM (pulse-width modulation) rectifier, a maximum power point tracking unit (MPPT) and an invertible variable flow control system based on a DSP (digital signal processor. The deadbeat current tracking control method for adding zero vector modulation is used for inhibiting the current change rate in the PWM control and reducing a power tube switch stress so that a network-side current can track an order current within a switch period so as to achieve an electric energy high-quality control function; the method comprises the following steps: tracking the current within a PWM control period; controlling the on-off of the V1-V4 power tube switches shown in a figure; and limiting the change rate of the current, therefore, the actual current can catch up with the order current within the PWM period so as to achieve the deadbeat current tracking control.
Owner:南京冠亚电源设备有限公司
Method for logically controlling combined chopped waves of power switch devices of switched reluctance motor
InactiveCN103840719ASolve uneven heatingBalance the frequency of useElectronic commutation motor controlBridge typeElectric machine
The invention discloses a method for logically controlling combined chopped waves of power switch devices of a switched reluctance motor. A combined chopped wave logical control circuit adopted in the method comprises a signal feedback circuit, a logical processing chip and a power drive circuit, wherein the logical processing chip and the power drive circuit are connected in sequence. A power switch tube set in the power drive circuit is of an asymmetric bridge type topological circuit structure. Each phase is of a structure of an upper bridge arm and a lower bridge arm, wherein the structure is composed of two power switch tubes, two diodes and a motor winding in series connection. When the current of the switched reluctance motor is increased, the power switch tubes of the upper bridge arm and the lower bridge arm are switched on simultaneously; when the current is reduced, one power switch tube is switched off and the other power switch tube is switched on. According to the method for logically controlling the combined chopped waves of the power switch devices of the switched reluctance motor, consumption of a switch is evenly distributed to the two switch devices on one phase, the use frequency of the switch devices is balanced, so that the problem that the power switch devices emit heat unevenly is solved, the switching stress of the power switch devices is reduced, and the service life of the power switch tubes is prolonged.
Owner:浙江仕迈电机有限公司
Method of and apparatus for protecting a switch, such as a MEMS switch, and to a MEMS switch including such a protection apparatus
ActiveUS10033179B2Improve performanceDecreased signal propagationElectrostatic/electro-adhesion relaysElectrothermal relaysShunt DeviceElectrical performance
A method of and apparatus for protecting a MEMS switch is provided. The method and apparatus improve the integrity of MEMS switches by reducing their vulnerability to current flow through them during switching of the MEMS switch between on and off or vice versa. The protection circuit provides for a parallel path, known as a shunt, around the MEMS component. However, components within the shunt circuit can themselves be removed from the shunt when they are not required. This improves the electrical performance of the shunt when the switch is supposed to be in an off state.
Owner:ANALOG DEVICES INT UNLTD
Double closed-loop control of VIENNA rectifier with neutral point potential balance control
InactiveCN107645244AExcellent grid side performanceImprove dynamic and static performanceAc-dc conversionThree levelClosed loop
The present invention discloses a double closed-loop control of a VIENNA rectifier with neutral point potential balance control. A VIENNA rectifier is high in power factor, low in input current THD, few in switching devices and low in switching stress and has no switching dead zone, is high in reliability, and is especially suitable for medium and high power occasions of energy one-way flow. The double closed-loop control of a VIENNA rectifier with neutral point potential balance control can realize neutral point voltage balance control at a direct current side through regulation of a direct current offset, and a three-level SVPWM algorithm based on a two-level space vector plane is provided by the invention, so that neutral point voltage balance control is realized while a rectifier system has a good input performance and a direct current voltage stabilization performance.
Owner:郭琳
Self-balancing non-isolated modular multilevel DC-DC converter
ActiveCN107681886ARealize automatic balanceAvoid AC circulationEfficient power electronics conversionApparatus without intermediate ac conversionCapacitanceEnergy transfer
The invention provides a self-balancing non-isolated modular multilevel DC-DC converter, which comprises a power main circuit and a power balance circuit which are connected to each other, wherein thepower balance circuit comprises a plurality of air core inductors and a diode; the air core inductors are sequentially connected with the diode in series; the power main circuit is formed by sequentially connecting an input filter inductor, an output buffer inductor and a plurality of submodules through a series chain in series; and when the submodules are in a removal state, a bus capacitor of one submodule and the bus capacitor of the adjacent submodule carry out energy transfer through the power balance circuit. AC running through a bridge arm of the converter is avoided, the switching loss is reduced and the DC side filter inductance is reduced.
Owner:SHANGHAI JIAO TONG UNIV
Active clamping, boosting and isolating series miniature converter control method and device
InactiveCN105071663AReduce volumeLow costDc-dc conversionElectric variable regulationDriving circuitElectric current
The invention discloses an active clamping, boosting and isolating series miniature converter control method and a device. The device comprises an acquisition circuit used to acquire an input direct voltage and current signal and an output direct voltage signal, a controller used to track the maximum power of the input direct voltage and current signal and form a switching drive signal, a drive circuit used to control on-off of a main switch and an auxiliary switch of an active clamping and boosting circuit according to the switching drive signal, the active clamping and boosting circuit used to actively clamp and boost the high side of the input direct voltage signal, and an isolation circuit used to isolate the direct voltage signal after high-side active clamping and boosting and output a boosted high-frequency direct voltage. By adopting the active clamping, boosting and isolating series miniature converter control method and the device of the invention, on the premise of ensuring the safety performance of voltage conversion, the number of the switches is reduced, the stress of the switches is lowered, the size of the device is reduced, and the cost is lowered.
Owner:XIHUA UNIV
Interleaved bidirectional DC-DC converter and control method thereof
InactiveCN110323945AImprove overload capacityIncreased torque output capabilityDc-dc conversionElectric variable regulationConstant speedPermanent magnet motor
The invention relates to the technical field of power electronics, in particular to a bidirectional DC-DC converter and a control method thereof. For the problems that a constant speed area and a constant power area need to be frequently switched because the running conditions of a permanent magnet motor driving system are generally large in random fluctuation and are relatively complicated, and the torque output capacity and the high-speed power output capacity of a driving motor are poor due to the influence of output fluctuation of a storage battery of an electric automobile, the interleaved bidirectional DC-DC converter and the control method thereof are provided. The dynamic direct current bus voltage regulation is realized, and the direct current bus voltage gain is improved, so thatthe turning speed of the motor is increased, and the overload capacity of the motor is indirectly improved; a constant torque area is expanded to improve the torque output capacity of the motor; andmeanwhile, a weak magnetic area is delayed to be accessed, so that the loss of the driving system is reduced, and the temperature rise of the system is reduced.
Owner:CHANGSHA UNIVERSITY
Switch capacitor type quasi switch boosting DC-DC converter
InactiveCN106787728ASimple structureEasy to controlDc-dc conversionElectric variable regulationCapacitanceEngineering
The invention provides a switch capacitor type quasi switch boosting DC-DC converter. The switch capacitor type quasi switch boosting DC-DC converter mainly comprises an input direct-current voltage source, a quasi switch boosting network, a switch capacitor network, a second MOS tube, a third diode, a fourth capacitor and a load resistor, wherein the quasi switch boosting network consists of a first inductor, a first capacitor, a first diode, a second diode and a first MOS tube; and the switch capacitor network consists of a second capacitor, a fourth diode, a third capacitor and a fifth diode. The whole circuit is simple in structure, current of a power supply is continuous, input and output are in common-ground, and the characteristic of single-stage boosting and reducing of the quasi switch boosting network and the characteristics of parallel charging and serial discharging of the switch capacitor are combined, so that the switch capacitor type quasi switch boosting DC-DC converter has high output voltage gain. A circuit does not have start impact current or impact current at the moment of switch-on of a switch tube.
Owner:SOUTH CHINA UNIV OF TECH
Single-phase three-switch-tube pseudo totem pole type three-level rectifier
ActiveCN112865562AHidden danger of no bridge arm throughNo reverse recovery issuesEfficient power electronics conversionAc-dc conversionCapacitanceControl power
A single-phase three-switch-tube pseudo totem pole type three-level rectifier comprises a single-phase pseudo totem pole structure, a filter and a single-phase rectifier bridge with a bidirectional switch tubes. According to the single-phase pseudo totem pole structure, two asymmetric bridge arms are formed by two full-control power switch tubes and two common diodes; the single-phase rectification branch with the bidirectional switch tubes is composed of a bridge arm composed of two diodes, a group of bidirectional switch tubes, two identical capacitors and a load; and the bidirectional switch tube structure is composed of four diodes and a full-control switch tube, and bidirectional flow of current is achieved. The single-phase three-switch-tube pseudo totem pole type three-level rectifier integrates a traditional totem pole rectification technology and a three-level topology technology, and compared with a traditional boost power factor correction rectifier, the single-phase three-switch-tube pseudo totem pole type three-level rectifier can effectively reduce stress of the switch tubes, conduction loss of the switch tubes is small, and meanwhile the bridge arm direct connection phenomenon does not exist.
Owner:CHINA THREE GORGES UNIV
Same-phase power supply system based on single-phase full-bridge diode clamping multilevel back-to-back converter
The invention discloses a same-phase power supply system based on a single-phase full-bridge diode clamping multilevel back-to-back converter. A secondary winding of an alpha-phase step-down transformer (2) is parallelly connected with an input end of a diode clamping multilevel rectifier through a connecting reactor (5), an output end of the diode clamping multilevel rectifier is parallelly connected with a second winding of a beta-phase step-down transformer (3) through a connecting reactor (5), and parallel output is connected in a traction network to power a load; a signal controller (7) mainly collects load current I load, phase signals of alpha-phase voltage and beta-phase voltage and voltage Vdc of a direct-current side capacitor, and current I alpha and I beta is controlled to be equal through a control circuit, so that balance of three-phase current on a network side is guaranteed. When the same-phase power supply system is applied in high-voltage high-power places, switch stress borne by devices can be lowered, switch loss of the devices is reduced, du / dt, di / dt and output waveform harmonic content during circuit running are lowered, capacity, grade and efficiency of the circuit are improved, and functions of the circuit are enabled to be more advantageous; the whole system is enabled to be small in loss and long in service life, so that maintenance frequency is lowered greatly.
Owner:SOUTHWEST JIAOTONG UNIV
A kind of pwm plus double phase shifting control method for bidirectional dc/dc converter
ActiveCN103986331BExtended Soft Switching RangeEliminate circulating powerDc-dc conversionElectric variable regulationSoft switchingDouble phase
Owner:SHANDONG UNIV
Satisfaction optimization prediction fault-tolerant control method for double-three-level inverter
InactiveCN111525784ASuperior fault-tolerant control performanceEasy to operateAc-dc conversionPhase currentsVoltage vector
The invention discloses a satisfaction optimization prediction fault-tolerant control method for a double-three-level inverter. A stator winding of the motor is opened; two ends of the stator windingare powered by two same inverters; the two inverters share the same set of direct-current bus to form a common-bus double-three-level topology; when an open-circuit fault occurs in a certain switchingdevice, the maximum output voltage of the inverter is reduced to half of the original output voltage; the voltage jump range is controlled to be set within Vdc / 2 through the inverter; a reference voltage vector is synthesized by using the available switching state of the inner hexagon of the common-bus double-three-level topology; the current following performance is taken as a main control target of the double-inverter system and a three-phase current satisfaction error function is established for optimizing the reference voltage vector; and the neutral point potential balance is taken as afinal control target, a neutral point potential satisfaction judgment function is established, and further the reference voltage vector is optimized through a comprehensive satisfaction error function.
Owner:JIANGSU OCEAN UNIV
Three-level LLC converter and control method thereof
PendingCN111431416ARealize self-balancing of capacitanceImprove performanceDc-dc conversionElectric variable regulationCapacitor voltageTransformer
The invention discloses a three-level LLC converter and a control method thereof. The three-level LLC converter comprises four direct-current input filter capacitors, four switching devices, a clamping capacitor, two filters, two transformers, two diodes and an output voltage stabilizing capacitor. The control method comprises the steps of output voltage fractional order control adjustment and driving signal generation. The three-level LLC converter has the advantages that the topological switch stress is small,; the voltage is half of the direct-current bus voltage; the three-level LLC converter is simple in structure, low in , the switching loss is low and capable of improvingthe system efficiency is improved, and, finally, the three-level LLC converter can achieve circuit input capacitor voltage self-balance, a large number of voltage sensors and a complex voltage balance control algorithm do not need to be added, and the three-level LLC converter is simple in system control structure and, has excellent anti-interference performance, steady state performance and dynamic performance and has engineering application value.
Owner:HEBEI HUINENG XINYUAN ELECTRONICS TECH CO LTD
An active clamp no electrolytic capacitor led drive power supply
The invention discloses an active clamp non-electrolytic capacitor LED driving power supply, comprising an AC input power supply, an input filter part, a rectifier part, a clamp circuit, a flyback converter, an output filter capacitor Co, a parallel absorption circuit and an LED load; The input filter part is composed of input filter inductor and input filter capacitor; the rectifier part is composed of four switch tubes; the clamping circuit is composed of switch tubes S 2 and the clamping capacitor C aux The flyback converter consists of a flyback transformer, a switch tube S 1 and diode D s Composition; the flyback transformer includes the primary winding and the secondary winding, and the primary winding includes the main inductance L m and leakage inductance L r , the primary winding is connected to the input, and the secondary winding is connected to the output; the parallel absorption loop includes the boost inductor L b , switch tube S 3 , switch tube S 4 and storage capacitor C ds . The present invention introduces an active clamp circuit to reduce the switch tube S 1 switch stress; switch tube S 1 and switch tube S 2 Both realize soft switching, reducing switching loss; at the same time, leakage inductance energy can be fed back.
Owner:HEBEI UNIV OF TECH
A non-transformer isolated dc-dc converter with large step-down ratio
ActiveCN111682752BReduce voltage stressReduce in quantityApparatus without intermediate ac conversionConvertersCapacitance
The invention discloses a non-transformer isolated DC-DC converter with a large step-down ratio. The positive pole of the input power supply is connected to the positive pole of the first capacitor and one end of the first switch tube, and the other end of the first switch tube is connected to the first switch tube. One end of the second switch tube is connected to the positive pole of the third capacitor, the negative pole of the third capacitor is connected to one end of the first inductor and one end of the fourth switch tube, the other end of the first inductor is connected to one end of the load resistor and the second inductor One end of the first capacitor is connected, the negative pole of the first capacitor is connected with the positive pole of the second capacitor, the other end of the second switch tube, the other end of the second inductor and one end of the fifth switch tube, the negative pole of the second capacitor, the input power supply Both the negative pole and one end of the third switching tube are grounded, and the other end of the third switching tube is connected to the other end of the fifth switching tube, the other end of the fourth switching tube and the other end of the load resistor, and the converter has low loss. At the same time, it has the characteristics of high efficiency, small size, light weight, and large voltage change ratio.
Owner:XI AN JIAOTONG UNIV
Double-loop grid-connected control method for z-source inverter based on repetitive proportional resonance control
ActiveCN106451545BGood steady state characteristicsImprove reliabilityEfficient power electronics conversionAc-dc conversionZ-source inverterProportional control
The invention relates to a Z source inverter double loop grid-connected control method based on repetitive proportional resonant control. The method is used for an LC type Z source inverter grid-connected system. The method comprises the steps of 1, obtaining circuit reference values at an alpha and beta axis according to acquired capacitor and voltage in a Z source inverter; 2, obtaining circuit feedback values at the alpha and beta axis according to acquired grid side inductive current; 3, adding difference values of the circuit reference values and the circuit values after the circuit reference values and the circuit values pass through a repetitive controller and a proportional resonant controller respectively to obtain circuit values of repetitive proportional resonant control, and inputting the obtained circuit values into an SPWM module. Compared with the prior art, waveform quality of grid-connected circuit and voltage under the LC type filter is improved, harmonic distortion rate is reduced, pressure raising effect is drastically improved, system structure is simplified, and use of related materials is saved.
Owner:SHANGHAI UNIVERSITY OF ELECTRIC POWER
A control circuit of a three-phase high power factor rectifier
InactiveCN103166489BSimple control methodReduce the amount of detectionEfficient power electronics conversionAc-dc conversionInterference resistanceEngineering
The invention discloses a control circuit for a three-phase high power factor rectifier, and belongs to the field of electrical control. The control circuit comprises an input high-frequency filter circuit, a three-phase input inductor, a three-phase rectifier circuit, a switch tube power circuit, an output rectifier filter circuit, a voltage-dividing detection circuit, an input current detection unit, a single cycle controller and a switch tube driving circuit. A three-phase high power factor can be rectified, high-precision stable output voltage can be obtained, and interference resistance is high.
Owner:YANGZHOU XINHAO HEAVY MACHINERY
Direct current charger based on single-phase II-type three-level pseudo totem pole
ActiveCN113206601AHidden danger of no bridge arm throughNo reverse recovery issuesBatteries circuit arrangementsAc-dc conversion without reversalCapacitancePower factor
The invention discloses a direct current charger based on a single-phase II type three-level pseudo totem pole. The direct current charger comprises a pseudo totem pole bridge arm, a filter circuit and a single-phase II type rectifier bridge; the pseudo totem pole bridge arm comprises switch tubes S1 and S2 and diodes D3 and D4; the filter circuit comprises filter inductors L1 and L2; the single-phase II-type rectifier bridge comprises diodes D1 and D2, a pair of bidirectional switching tubes, capacitors C1 and C2 and a load RL; and the pair of bidirectional switch tubes comprises switch tubes S3-S6. According to the direct current charger based on the single-phase II type three-level pseudo totem pole, the pseudo totem pole rectification technology and the three-level topology technology are fused, and compared with a traditional boost power factor correction type two-level direct current charger, the stress of a switch tube can be effectively reduced, the conduction loss of the switch tube is small, and the bridge arm direct connection phenomenon does not exist; meanwhile, due to the fact that an II-type two-switch-tube series-connection type bidirectional switch branch exists in the circuit, the reliability of the direct-current charging circuit is greatly improved.
Owner:CHINA THREE GORGES UNIV
Distribution Transformer Integrated Cascaded Static Compensator
ActiveCN104201690BEasy to implement modularityImprove scalabilityReactive power adjustment/elimination/compensationReactive power compensationPower qualityConnection type
The invention discloses a distribution transformer integrated cascaded static compensator, which includes a distribution transformer, a cascaded static compensation module, an output filter and a control platform, and is set at the center of each phase winding on the high voltage side of the distribution transformer The connection tap is used as the injection point of the compensation current, and the connection tap is connected to the AC output terminal of the cascaded static compensation module through the output filter, and the control input terminal of the cascaded static compensation module is connected to the control platform, and the control platform is used to collect distribution transformers Based on the voltage and current information at the high and low voltage sides and the connection taps, the tracking command current signal is generated based on the information, and the output of the cascaded static compensation module is controlled by the tracking command current signal to achieve compensation. The invention integrates the cascaded multi-level structure and the distribution transformer, increases the capacity of the static compensator of the distribution network, and improves the power quality of the distribution network.
Owner:HUAZHONG UNIV OF SCI & TECH
Five-level single phase photovoltaic gird-connected inverter
InactiveCN103633868AReduce harmonic contentFewer power switchesAc-dc conversionSingle network parallel feeding arrangementsElectricitySelf-energy
The invention provides a five-level single phase photovoltaic gird-connected inverter, which comprises an alternating current access port, an electric reactor, a power switch circuit, a first photovoltaic battery module and a second photovoltaic battery module, wherein the alternating current access port is provided with an end a and an end b, the power switch circuit comprises eight power switches, the first photovoltaic battery module and the second photovoltaic battery module are respectively provided with a positive end and a negative end, one end of the electric reactor is connected with the end a of the alternating current port, and the other end of the electric reactor and the end b of the alternating current port are respectively and electrically connected with the power switch circuit. The five-level single phase photovoltaic gird-connected inverter has the advantages that the power switches are few, the structure is simple, the dependence of the inverter on a controller is reduced, the stability of the whole system can be improved, in the practical application, the switching stress of each switch is smaller, the self energy consumption of the inverter can be reduced, the size of a heat radiator is effectively reduced, and the overall benefits of the inverter are increased.
Owner:NINGBO GREENTECH ENERGY SAVING TECH
Current source type three-level direct-current converter and control method thereof
InactiveCN111030491AReduce in quantityThere is no direct parallel connectionAc-dc conversionHemt circuitsSwitching frequency
The invention discloses a current source type three-level direct-current converter and a control method thereof. The converter comprises two bridge arms, a balance inductor, a current source and a load, wherein the collecting electrodes of every two of four reverse blocking type power switch tubes are connected to form the two bridge arms. According to the invention, by using different switch modes, the multi-level current output is achieved, the equalization inductor and the bridge arm power switch tube bear 1 / 2 current source current, and the current sharing control correction is performed by using a redundant switch mode, so that the low switching stress, the low ripple characteristic and the high equivalent switching frequency are achieved, the circuit structure is simple, the number of devices is small, control is easy, and reliability is high; and the current source type three-level direct-current converter can be widely applied to low-voltage and large-current power electronic multi-level power conversion occasions.
Owner:WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
A Pseudo-Totem Pole Three-Level Rectifier with Single-phase Three-Switch Transistor
ActiveCN112865562BHidden danger of no bridge arm throughNo reverse recovery issuesEfficient power electronics conversionAc-dc conversionCapacitanceControl power
A single-phase three-switch tube pseudo-totem-pole three-level rectifier comprises a single-phase pseudo-totem-pole structure, a filter, and a single-phase rectifier bridge with two-way switch tubes. Among them: the single-phase pseudo-totem pole structure consists of two fully-controlled power switch tubes and two ordinary diodes to form two asymmetric bridge arms; A group of bidirectional switch tubes, 2 identical capacitors and a load, the bidirectional switch tube structure is composed of 4 diodes and 1 fully controlled switch tube to realize the bidirectional flow of current. The single-phase three-switch tube pseudo-totem-pole three-level rectifier combines traditional totem-pole rectification technology and three-level topology technology. Compared with the traditional boost power factor correction rectifier, it can effectively reduce the stress of the switch tube. The conduction loss is small, and there is no bridge arm through phenomenon.
Owner:CHINA THREE GORGES UNIV
Who we serve
- R&D Engineer
- R&D Manager
- IP Professional
Why Patsnap Eureka
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com