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34results about How to "Reduce output current ripple" patented technology
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Low-ripple switch power amplifier for permanent magnet biased electromagnetic-bearing
InactiveCN1710799ANo added complexitySimple structureBearingsMagnetic holding devicesMagnetic bearingAudio power amplifier
The invented equipment is in use for controlling current in load coil of electromagnet bearing. The switching power amplifier includes circuit for generating signal of pulse width modulation (PWM), light coupling isolation and switching drive circuit, main circuit of full bridge and current testing circuit. Based on error signal formed from specified signal of current and feedback signal of current, the switching power amplifier carries out PWM. Through light coupling isolation and switching drive circuit, completed PWM signal controls and turns to On / Off of four pieces of power switch tube on two bridge arms of main circuit of full bridge directly. The invention lowers wastage in electromagnet bearing caused by current ripple.
Owner:BEIHANG UNIV
Multiphase resonance bridge type modular multi-level switch capacitor converter
ActiveCN103618462AReduce output current rippleImprove conversion efficiencyEfficient power electronics conversionDc-dc conversionBridge typeResonance
The invention discloses a multiphase resonance bridge type modular multi-level switch capacitor converter. The input ports of at least two unit resonance switch capacitor circuits are connected in parallel with each other, and the output ports of the two unit resonance switch capacitor circuits are connected in parallel with each other; the unit resonance switch capacitor circuits are bridge type modular multi-level switch capacitor converter topologies; each unit circuit realizes resonance soft switches and guarantees output of 4N times of input voltage; phase-shifting control is adopted among all the unit circuits. The output voltage ripple is further reduced, and the problem that the input current ripple of a single-phase switch capacitor converter is tool high is solved, so that the energy conversion efficiency of a system and the power class of the converter are further improved. The multiphase resonance bridge type modular multi-level switch capacitor converter is applicable to occasions with high current and high gain.
Owner:XIAMEN UNIV
A power supply method and a charging device for a super capacitor energy storage type trolley car
InactiveCN108988447AImprove survival rateReduce dependenceBatteries circuit arrangementsRailway vehiclesCapacitanceElectricity
The invention discloses a power supply method and a charging device for a super capacitor energy storage type trolley car, the power supply is that when a tram with on-board supercapacitors arrives atthe station, The pantograph is powered from the DC / DC chopper to the on-board supercapacitor. DC energy is output to DC / DC chopper after AC / DC converter rectifies 380V three-phase AC input from powergrid, and DC energy is output to DC / DC chopper by ground supercapacitor. The vehicle-mounted supercapacitor is charged after pantograph is fully charged. The DC / DC chopper stops charging the vehicle-mounted supercapacitor when the vehicle-mounted supercapacitor is fully charged or when the tram leaves the station. The output switch of the DC / DC chopper is turned off and the pantograph is loweredback. The AC / DC converter switches to the ground supercapacitor to charge the ground supercapacitor so as to obtain the continuous replenishment of the pre-stored DC energy. The invention has the advantages of improving the survival rate of the trolley, reducing the capacity dependence on the power supply network and the impact on the power supply network, and reducing the construction and operation cost.
Owner:NARI TECH CO LTD +1
Phase shift compensation interleaved three-level LLC resonant converter
InactiveCN105897000AReduce volumeImprove overall lifespanEfficient power electronics conversionDc-dc conversionThree levelResonant converter
The invention discloses a phase shift compensation interleaved three-level LLC resonant converter, and belongs to the technical field of power electronic converters. The converter includes an input power supply, two three-level LLC resonant circuits, two center-tapped transformers, two rectifier circuits, and an output circuit; and each three-level LLC resonant circuit comprises an input voltage dividing capacitor, a switch bridge arm and a resonant cavity which are connected in sequence. The converter provided by the invention can achieve a wide range of inputs, and also can compensate for the unsynchronized switching frequencies of the two circuits due to parameter errors by adjusting the duty cycle via the phase shift adjustment module. The two circuits are enabled to work at the same switching frequency without adding any auxiliary circuit through the interleaved structure, the output ripple is reduced, the converter efficiency is improved, and the service life of the power supply is prolonged.
Owner:SHAANXI UNIV OF SCI & TECH
Full-coupling magnetic element
ActiveCN111341544AFirmly connectedReduce package thicknessTransformersTransformers/inductances coils/windings/connectionsSemiconductor chipHemt circuits
The invention relates to the technical field of coupling inductors, and particularly relates to and discloses a full-coupling magnetic element, which comprises at least two phases of circuits. Each phase of circuit is formed by connecting a plurality of coupling units, each two phases of circuits are directly coupled through at least one coupling unit, and the directions of magnetic fields generated by respective direct current components in the currents of the two phases of circuits are opposite. According to the full-coupling magnetic element, all phases are directly coupled to one another,and low output current ripples are achieved; the integrated full-coupling magnetic element has very high regularity and expandability, and has the advantages of small size, low cost, strong expansibility and high integration; and the full-coupling magnetic element can be integrated with a peripheral semiconductor chip into a single chip, or the full-coupling magnetic element can be directly manufactured on a wafer which is provided with a semiconductor chip in advance, so that a micro power supply management chip which is highly integrated and does not need an external magnetic passive deviceis formed, and the micro power supply management chip can replace traditional circuits and schemes such as power supply management based on discrete components, and is applied to multiple purposes.
Owner:杭州矽磁微电子有限公司
Driving power source for smart LED bulb
ActiveCN104159379AImprove power factorReduce output current rippleElectric light circuit arrangementCapacitanceMicrocontroller
The invention discloses a driving power source for a smart LED bulb. The driving power source comprises an EMI filtering circuit, a rectifying circuit, a power factor correcting circuit, a power converting circuit, a DC-DC converting circuit and a dimming control circuit, wherein the power factor correcting circuit comprises a valley filling circuit and an electrolytic capacitor connected to the valley filling circuit, and the output end of the valley filling circuit is connected with the input end of the power converting circuit; the power converting circuit is a primary side feedback power converting circuit, and the output end of the power converting circuit is connected with the dimming control circuit; the dimming control circuit comprises a single-chip microcomputer control module and an MOS transistor, the input end of the DC-DC converting circuit is connected with the output end of the power converting circuit, the output end of the DC-DC converting circuit is connected with the single-chip microcomputer control module, and the switch-on duty ratio of the MOS transistor is controlled through the single-chip microcomputer control module so that dimming and color modulation on loads can be achieved. The driving power source for the smart LED bulb is low in cost, small in size and low in power consumption; the driving power source meets the requirement for a high power factor and the requirement for non-flickering lighting of the bulb at the same time.
Owner:FOSHAN TOPDAY OPTOELECTRONICS TECH
Electrolytic hydrogen production rectification power supply based on high-transformation-ratio transformer and control method
ActiveCN113517821AIncrease output powerReduce output current rippleElectrolysis componentsAc-dc conversionPhysicsSingle phase
Owner:SICHUAN UNIV
On-board charger for charging battery
ActiveUS20140361750A1Reduce surge voltageReduce output current rippleCharging stationsConverter typesIn vehicleSurge voltage
An on-board charger for charging a battery of an eco-friendly vehicle and a method for charging a battery using the on-board charger are provided. The on board charger reduces an output current ripple by improving a snubber circuit unit of the on-board charger for charging a battery in plug-in hybrid and electric vehicles. In addition, the on-board charger for charging a battery of an eco-friendly vehicle reduces a surge voltage generated in a rectifier diode and reduces an output current ripple by arranging two capacitors and three diodes in a transformer secondary rectifier of the on-board charger.
Owner:HYUNDAI MOTOR CO LTD
Buck DC-DC converter and electronic device
ActiveCN109361316AGood blood pressure effectIncrease power levelDc-dc conversionElectric variable regulationDc dc converterParalleling technique
The invention provides a buck DC-DC converter and an electronic device. The buck DC-DC converter comprises an input unit, a first phase buck unit, a second phase buck unit, an output unit and a control unit; the input unit is used for connecting with a direct current source, and the output unit is used for connecting with a direct current load. The first phase buck unit and the second phase buck unit are connected with the direct current load; the first phase buck unit includes a first switch tube; the second phase buck unit includes a second switch tube and a third switch tube; the control unit outputs pulse width modulation signals respectively to the first switch tube, the second switch tube and the third switch tube such that the first phase buck unit and the second phase buck unit outputs a voltage alternately to the output unit. The two-phase alternate parallel technique is used herein, buck capacity of the converter is improved, voltage stress and output current ripple of a switch device are decreased, and power level of the converter is increased.
Owner:SUZHOU INOSA UNITED POWER SYST CO LTD
Three-phase controllable pulse power supply rectifier topology and rectification method
PendingCN113904570AReduce output current rippleImprove energy efficiencyAc-dc conversion without reversalDc-dc conversionPhysicsDc converter
The invention discloses a three-phase controllable pulse power supply rectifier topology and a rectification method. The rectifier comprises a multi-pulse wave uncontrolled rectifier and a two-stage AC-DC converter which are connected in parallel, the multi-pulse wave uncontrolled rectifier is a three-phase bridge type rectification structure formed by diodes or thyristors, and the two-stage AC-DC converter can output a compensation current which is equal to a ripple current generated in a loop of the multi-pulse uncontrolled rectifier in magnitude and opposite to the ripple current in direction. According to the present invention, the multi-pulse wave uncontrolled rectifier is used as a main power loop, the two-stage AC-DC converter is used as an auxiliary power loop, the auxiliary power loop outputs the compensation current to compensate the ripple current generated by the main power loop, so that the low-cost high-power efficient use is achieved.
Owner:苏州川涌光电科技有限公司
Three-level hysteresis current tracking inverter and control method of three-level hysteresis current tracking inverter
ActiveCN103117669AGuaranteed to track correctlyIncrease the number of switchesAc-dc conversionHysteresisThree level
The invention discloses a three-level hysteresis current tracking inverter and a control method of the three-level hysteresis current tracking inverter. An three-level inverter bridge output end is connected with an inductor in series mode and then serves as an output end of the three-level hysteresis current tracking inverter, each voltage detecting unit respectively detects voltage between a zero level supporting point of a three-level inverter bridge and a three-level output end of the inverter, detected results are respectively fed to each driving control unit, a current detecting unit detects three-level output current of the inverter, detected results are respectively fed to each hysteresis comparison unit, three-level command current signals are respectively fed to each hysteresis comparison unit and each driving control unit, output ends of each hysteresis comparison unit are connected with corresponding driving control units, output ends of each driving control unit are connected with corresponding units, and output ends of each driving unit are connected with driving signal input ends of the three-level inverter bridge. The device and the control method can perform hysteresis tracking control on output current of the three-level inverters and have the advantages of being high in tracking accuracy, fast in speed, good in real-time and the like.
Owner:SHANDONG HOTEAM ELECTRICAL
A Multiphase Resonant Bridge Modular Multilevel Switched Capacitor Converter
ActiveCN103618462BReduce output current rippleImprove conversion efficiencyEfficient power electronics conversionDc-dc conversionBridge typeResonance
The invention discloses a multiphase resonance bridge type modular multi-level switch capacitor converter. The input ports of at least two unit resonance switch capacitor circuits are connected in parallel with each other, and the output ports of the two unit resonance switch capacitor circuits are connected in parallel with each other; the unit resonance switch capacitor circuits are bridge type modular multi-level switch capacitor converter topologies; each unit circuit realizes resonance soft switches and guarantees output of 4N times of input voltage; phase-shifting control is adopted among all the unit circuits. The output voltage ripple is further reduced, and the problem that the input current ripple of a single-phase switch capacitor converter is tool high is solved, so that the energy conversion efficiency of a system and the power class of the converter are further improved. The multiphase resonance bridge type modular multi-level switch capacitor converter is applicable to occasions with high current and high gain.
Owner:XIAMEN UNIV
Staggered single-cycle control complementary current generator and control method thereof
ActiveCN101969200AFast trackingAccurate trackingReactive power adjustment/elimination/compensationReactive power compensationRipple cancellationPower flow
The invention relates to a staggered single-cycle control complementary current generator and a control method thereof. The invention has the advantages of small current tracking error, high tracking speed, fixed switching frequency, and the like and remarkably decreases the ripple component of the output compensation current in a staggered ripple cancellation mode. The staggered single-cycle control complementary current generator comprises a three-phase inverter bridge I and a three-phase inverter bridge II, the output ends of the two three-phase inverter bridges I and II are respectively connected in series with a current transformer group I and a current transformer group II and then respectively connected with a three-phase inductor I and a three-phase inductor II, the output ends ofthe three-phase inductors I and II are connected in parallel and then connected with a three-phase compensated power line, the three-phase inverter bridges are respectively connected with pulse driving devices which are respectively with corresponding current detection units I and II, synchronous pulse generating units, voltage parameter arithmetic elements and instruction current arithmetic elements, the current detection units are connected with the respective current transformer groups, and the two arithmetic elements are connected with corresponding detection units.
Owner:山东华天科技集团股份有限公司
Low-ripple switch power amplifier for permanent magnet biased electromagnetic-bearing
InactiveCN1291545CNo added complexitySimple structureDc-dc conversionMagnetic holding devicesMagnetic bearingFull bridge
The invented equipment is in use for controlling current in load coil of electromagnet bearing. The switching power amplifier includes circuit for generating signal of pulse width modulation (PWM), light coupling isolation and switching drive circuit, main circuit of full bridge and current testing circuit. Based on error signal formed from specified signal of current and feedback signal of current, the switching power amplifier carries out PWM. Through light coupling isolation and switching drive circuit, completed PWM signal controls and turns to On / Off of four pieces of power switch tube on two bridge arms of main circuit of full bridge directly. The invention lowers wastage in electromagnet bearing caused by current ripple.
Owner:BEIHANG UNIV
A phase-shift full-bridge plasma power supply based on all-sic devices
PendingCN122512779AReduce Harmonic PollutionImprove power factor
This invention discloses a phase-shifted full-bridge plasma power supply based on all SiC devices, belonging to the field of special power supply technology. It includes: a rectifier unit with a power factor correction circuit; an inverter unit containing a phase-shifted full-bridge topology composed of SiC power devices and an energy storage inductor, achieving zero-voltage switching through phase-shift control; a transformer unit; an output unit including an output filter capacitor; and a control unit that uses an incremental PID algorithm to generate phase-shift control signals. This invention analyzes the differences in zero-voltage switching between the leading and lagging bridge arms, utilizes the low output capacitance characteristics and dynamic dead-time adjustment of SiC devices, broadens the soft-switching range under light loads, effectively reduces output current ripple, and improves dynamic response speed and overall efficiency.
Owner:GUILIN UNIV OF ELECTRONIC TECH
A system and method for suppressing half-cycle current distortion of a double-buck grid-connected inverter
ActiveCN107196491BReduce output current rippleReduce lossAc-dc conversionGrid-tie inverterEquivalent linearization
The invention discloses a half-period operating current distortion suppression system and method for a double-buck grid-connected inverter. The invention establishes that the buck unit works in the current continuous mode and the half-period working state of the buck unit in the dual-buck topology. The different intervals of the current discontinuous mode, and establish the corresponding relationship between the switching time of the continuous current mode and the discontinuous mode and the amplitude of the incoming current. In the discontinuous current mode, according to the nonlinear relationship between the voltage gain of the buck unit and the duty ratio, the output of the current loop regulator is corrected for the equivalent linearization of the modulated wave, so that the gain and the output of the regulator to the bridge arm voltage Consistent when the current is continuous. The invention reduces the current ripple and current conduction time by reducing the duty cycle, avoiding the current distortion problem caused by the inductor current ripple in the traditional control, so that the half-period working double-buck inverter is not only efficient and reliable, but also Realizing low harmonics of incoming grid current is more conducive to the application of dual-buck topology in grid-connected inverters.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Control method of DC-DC converter based on Lyapunov function
ActiveCN113419421AControl output errorReduce output voltage rippleDc-dc conversionAdaptive controlLyapunov matrixControl engineering
The invention discloses a control method of a DC-DC converter based on a Lyapunov function. The method comprises the following steps: S1, establishing a switching affine model of the DC-DC converter; S2, designing an expression of an error tracking switching control law based on a segmented time-varying Lyapunov matrix; S3, determining values of undetermined parameters of the error tracking switching control law by solving a linear matrix inequality; and S4, controlling the state of a switching element of the DC-DC converter through an error tracking switching control law sigma (x (k)), and further controlling the output of the DC-DC converter. According to the invention, in the related parameter solving process of the error tracking switching control law, a multi-Lyapunov function method with a segmented time-varying Lyapunov matrix and a sampling control method are adopted, and compared with a traditional common Lyapunov function method, the method has the advantages that the conservative property and complexity of related parameter solving of the DC-DC converter are reduced, the output error of the DC-DC converter is reduced, and the electric energy conversion efficiency of the DC-DC converter is effectively improved.
Owner:GUANGDONG UNIV OF TECH
Staggered parallel DC-DC converter with high step-down ratio
ActiveCN110460234AHigh Step-Down RatioImprove efficiencyDc-dc conversionElectric variable regulationCapacitancePower flow
The invention discloses a staggered parallel DC-DC converter with a high step-down ratio. The positive electrode of a power supply is connected with one end of a first capacitor, the negative electrode of a second diode, one end of a first switch transistor and one end of a second switch transistor; the other end of the first capacitor is connected with the positive electrode of a third diode andthe negative electrode of a first diode; the positive electrode of the second diode is connected with the negative electrode of the third diode and one end of a second capacitor; the other end of a first switch transistor is connected with one end of a second inductor and the negative electrode of a fourth diode; the other end of the second switch transistor is connected with one end of the firstinductor and the negative electrode of a fifth diode; the other end of the first inductor is connected with the other end of the second inductor and one end of a load resistor; and the negative electrode of the power supply is connected with the other end of the second capacitor, the other end of the load resistor, the positive electrode of the fifth diode and the positive electrode of the first diode. The converter has the characteristics of a high step-down ratio, low output ripples, continuous input current and good voltage regulation ability.
Owner:XI AN JIAOTONG UNIV
A LED smart light bulb drive power supply
ActiveCN104159379BImprove power factorReduce output current rippleElectric light circuit arrangementCapacitanceMicrocomputer control
The invention discloses a driving power source for a smart LED bulb. The driving power source comprises an EMI filtering circuit, a rectifying circuit, a power factor correcting circuit, a power converting circuit, a DC-DC converting circuit and a dimming control circuit, wherein the power factor correcting circuit comprises a valley filling circuit and an electrolytic capacitor connected to the valley filling circuit, and the output end of the valley filling circuit is connected with the input end of the power converting circuit; the power converting circuit is a primary side feedback power converting circuit, and the output end of the power converting circuit is connected with the dimming control circuit; the dimming control circuit comprises a single-chip microcomputer control module and an MOS transistor, the input end of the DC-DC converting circuit is connected with the output end of the power converting circuit, the output end of the DC-DC converting circuit is connected with the single-chip microcomputer control module, and the switch-on duty ratio of the MOS transistor is controlled through the single-chip microcomputer control module so that dimming and color modulation on loads can be achieved. The driving power source for the smart LED bulb is low in cost, small in size and low in power consumption; the driving power source meets the requirement for a high power factor and the requirement for non-flickering lighting of the bulb at the same time.
Owner:FOSHAN TOPDAY OPTOELECTRONICS TECH
Power factor correction circuit, control system and power supply equipment
PendingCN114285262ALow costImprove work efficiencyEfficient power electronics conversionPower conversion systemsCapacitanceAverage current
Owner:GREE ELECTRIC APPLIANCES INC
A dynamic current supply circuit and method for reducing ripple
ActiveCN113992161BGuaranteed fixed effectReduce filter ripple effectAmplifier modifications to reduce non-linear distortionAmplifier modifications to reduce temperature/voltage variationCapacitanceHemt circuits
The invention discloses a dynamic current supply circuit and method for reducing ripple, wherein the linear power amplification unit includes a non-inverting input terminal, a reverse input terminal and an output terminal; the discrete acquisition unit includes a positive terminal, a negative terminal and a sampling output terminal The positive end is connected to one end of the capacitor C1 close to the output end of the linear power amplifying unit, and the negative end is connected to the other end of the capacitor C1 far away from the output end of the linear power amplifying unit. The gate and the first drain, the second power MOS transistor includes a grounded second source, a second gate connected to the sampling output terminal, and a second drain connected to the first drain, and the constant current source includes a power transistor and a voltage source , the voltage source and the source of the power tube are connected to the inductor L1, the voltage source is connected to the gate of the power tube Mp, one end of the inductor L2 is connected to the drain of Mp, and the other end is connected to the other end of the capacitor C1 away from the linear power amplifier unit.
Owner:SHAANXI REACTOR MICROELECTRONICS
High-specific-power Buck circuit applied to satellite power supply
PendingCN112260536AHigh specific powerReduce output current rippleDc-dc conversionElectric variable regulationTelecommunicationsSpace power
The invention discloses a high-specific-power Buck circuit applied to a satellite power supply, which belongs to the technical field of space power supplies, and comprises an input end used for inputting a first voltage to a first Buck circuit and a second Buck circuit. The first Buck circuit is used for receiving the first voltage and outputting a second voltage to an output end together with thesecond Buck circuit; the first end of the first Buck circuit is connected with the input end; the second Buck circuit is used for receiving the first voltage and outputting the second voltage to theoutput end together with the first Buck circuit; the first end of the second Buck circuit is connected with the input end; the output end is used for receiving the control of the first Buck circuit and the second Buck circuit and outputting the second voltage; and the output end is connected with the second end of the first Buck circuit and the second end of the second Buck circuit. The high-specific-power Buck circuit applied to the satellite power supply provided by the invention has the characteristics of high specific power, low output current ripple, simple topological structure and highreliability.
Owner:中电科蓝天科技股份有限公司
Anti-condensation system of enclosed bus of generator
PendingCN112490988AAvoid condensationKeep dryCooling bus-bar installationsDrying gas arrangementsElectric generatorAir compressor
The embodiment of the invention discloses an anti-condensation system of an enclosed bus of a generator. The anti-condensation system is used for preventing the enclosed bus from generating a condensation phenomenon. The system of the embodiment comprises a three-phase enclosed bus, an air compressor device, an anti-condensation structure, an air storage tank, an inflation control device and a compressed air storage tank. The three-phase enclosed bus is connected with the inflation control device, the inflation control device is used for controlling the pressure of gas introduced into the aircompressor device, and the inflation control device is separately connected with the anti-condensation structure and the air compressor device. The anti-condensation structure is used for maintaininga dry environment in the three-phase enclosed bus, the air inlet end of the air storage tank is connected with the air compressor device and the compressed air storage tank, and the air outlet end ofthe air storage tank is connected with the inflation control device. The air storage tank is used for storing the gas introduced into the system, and the compressed air storage tank is used for reducing the output current pulsation of an air source.
Owner:湖南华润电力鲤鱼江有限公司
Control circuit of interleaved parallel bidirectional Buck-Boost converter
InactiveCN112994460AReduce output current rippleSmall rippleDc-dc conversionElectric variable regulationInner loopTurn off time
The invention discloses a control circuit of an interleaved parallel bidirectional Buck-Boost converter and belongs to the field of converters. The converter can work in a charging state or a discharging state according to actual needs, a voltage outer loop and a current inner loop generate regulating variables, and the output of the current inner loop is multiplied by a preset period T to obtain the conduction time of a switching device; according to a volt second balance theorem, required turn-off time can be calculated, so that the inductive current can be controlled to be in a critical conduction mode. According to the control circuit of the interleaved parallel bidirectional Buck-Boost converter, a high-precision high-frequency current sampling circuit and a zero-cross detection circuit can be avoided, the inductive current can be controlled to be in a critical continuous state just by sampling voltage signals and low-frequency current signals. The method has the advantage of low cost.
Owner:江苏新仁源电力科技有限公司
Staggered single-cycle control complementary current generator and control method thereof
ActiveCN101969200BFast trackingAccurate trackingReactive power adjustment/elimination/compensationReactive power compensationRipple cancellationSwitching frequency
The invention relates to a staggered single-cycle control complementary current generator and a control method thereof. The invention has the advantages of small current tracking error, high tracking speed, fixed switching frequency, and the like and remarkably decreases the ripple component of the output compensation current in a staggered ripple cancellation mode. The staggered single-cycle control complementary current generator comprises a three-phase inverter bridge I and a three-phase inverter bridge II, the output ends of the two three-phase inverter bridges I and II are respectively connected in series with a current transformer group I and a current transformer group II and then respectively connected with a three-phase inductor I and a three-phase inductor II, the output ends of the three-phase inductors I and II are connected in parallel and then connected with a three-phase compensated power line, the three-phase inverter bridges are respectively connected with pulse driving devices which are respectively with corresponding current detection units I and II, synchronous pulse generating units, voltage parameter arithmetic elements and instruction current arithmetic elements, the current detection units are connected with the respective current transformer groups, and the two arithmetic elements are connected with corresponding detection units.
Owner:山东华天科技集团股份有限公司
Three-level hysteresis current tracking inverter and control method of three-level hysteresis current tracking inverter
ActiveCN103117669BGuaranteed to track correctlyIncrease the number of switchesAc-dc conversionHysteresisThree level
The invention discloses a three-level hysteresis current tracking inverter and a control method of the three-level hysteresis current tracking inverter. An three-level inverter bridge output end is connected with an inductor in series mode and then serves as an output end of the three-level hysteresis current tracking inverter, each voltage detecting unit respectively detects voltage between a zero level supporting point of a three-level inverter bridge and a three-level output end of the inverter, detected results are respectively fed to each driving control unit, a current detecting unit detects three-level output current of the inverter, detected results are respectively fed to each hysteresis comparison unit, three-level command current signals are respectively fed to each hysteresis comparison unit and each driving control unit, output ends of each hysteresis comparison unit are connected with corresponding driving control units, output ends of each driving control unit are connected with corresponding units, and output ends of each driving unit are connected with driving signal input ends of the three-level inverter bridge. The device and the control method can perform hysteresis tracking control on output current of the three-level inverters and have the advantages of being high in tracking accuracy, fast in speed, good in real-time and the like.
Owner:SHANDONG HOTEAM ELECTRICAL
Digital high-power drive power supply implementation method
InactiveCN104362862ASmall rippleReduce output current rippleConversion with intermediate conversion to dcExcitation process/apparatusEngravingComplex programmable logic device
The invention discloses a digital high-power drive power supply implementation method. The method includes: performing rectifier filter on a 220V-alternating-current power supply to generate 310V-direct-current voltage; performing voltage stabilizing treatment on the 310V-direct-current voltage, wherein the direct-current voltage after treatment includes two grades, namely 12V and 5V which are respectively used for digital control and feedback control; acquiring feedback signals outputted by a load; comparing feedback signals acquired in the step 4 through a comparator; inputting results acquired by the comparator into a CPLD (complex programmable logic device) digital control module; outputting control commands by the CPLD digital control module; inputting the control commands in the step 6 into an inverter booster module which outputs control current to control the load to run. Based on the CPLD-based digital control mode, 10kb / s control pulse can be achieved in laser processing, and slope engraving and small-character engraving can be well implemented. The method is high in frequency response, accurate in control, small in output current ripple and capable of guaranteeing long-term and stable operation of a laser.
Owner:SUZHOU YOURUI TESTING TECH
Virtual inductive reactance control method for wind power generation in offshore platform wind power storage DC power supply system
ActiveCN107732896BImprove stabilityRealize flexible outputElectronic commutation motor controlVector control systemsVoltage vectorEngineering
The invention relates to a wind power generation virtual impedance control method in an offshore platform wind-solar storage DC power supply system. An introduced algebraic expression determined by avirtual impedance coefficient is subtracted from output of a current controller of a rectifier to change a control strategy of the rectifier, thereby changing an equivalent model for a generator stator side and the rectifier. The method is achieved through a power loop and a current loop and through voltage vector orientation, coordinate system transformation and coordinate system decoupling methods. The wind power generation virtual impedance control method in the offshore platform wind-solar storage DC power supply system provided by the invention is applied to an offshore platform DC powersupply system; an adaptive change of input side impedance of the rectifier is achieved through the control strategy; the influence of power oscillation caused by intermittent sea breeze on DC bus voltage is reduced; and the wind power generation virtual impedance control method has the advantages of being simple in control algorithm, small in output current ripple and wide in application prospect.
Owner:JIMEI UNIV
Voltage conversion device, control method of voltage conversion device and electronic equipment
PendingCN122577588AFast closed loop trackingImprove current regulation accuracy
This application relates to the field of voltage converter technology, providing a voltage conversion device, a control method for the voltage conversion device, and an electronic device. The voltage conversion device includes a DC voltage converter and a control device. The control device acquires a DC bus voltage reference value, determines the actual DC bus voltage value and reference frequency based on the DC bus voltage signal, and extracts the voltage ripple component of the DC bus voltage signal at a target frequency, where the target frequency is an integer multiple of the reference frequency. Furthermore, it combines the DC bus voltage reference value, the actual DC bus voltage value, and the voltage ripple component to perform voltage-current loop control, generating the switching control quantity of the DC voltage converter. This technical solution identifies and removes the ripple component corresponding to the target frequency before the bus voltage feedback enters the control loop. Because the target frequency is an integer multiple of the reference frequency, it can specifically handle the main disturbance components caused by the periodic energy fluctuations of the system.
Owner:QINGDAO HISENSE NETWORK ENERGY CO LTD
High Gain Boost DC Converter for Fuel Cell Power Generation
ActiveCN109861524BExtended service lifeReduce voltage stressDc-dc conversionElectric variable regulationCapacitanceControl theory
The invention discloses a high-gain boost DC converter for fuel cell power generation. The high-gain boost DC converter comprises an input power source Vin, wherein the positive pole of the input power source Vin is connected with an inductor L1; the inductor L1 connected with the drain of a switch S1 and a capacitor C1; the capacitor C1 connected with the anode of a diode D1, a capacitor C2 and an inductor L2; the inductor L2 connected with a load RL and a capacitor C4; the capacitor C2 connected with the cathode of a diode D2 and the anode of a diode D3; and the diode D3 having the cathode connected with the load RL and the capacitor C3, wherein the negative pole of the input power source Vin is connected with the source of the switch tube S1, the cathode of the diode D1, the anode of the diode D2, the capacitor C3 and the capacitor C4. The high-gain boost DC converter for fuel cell power generation has high voltage gain, low device voltage stress and low input and low output currentripples, is suitable for the field of fuel cell power generation, and can prolong the service life of the full cell while improving the low-voltage direct current of the fuel cell.
Owner:BEIJING JIAOTONG UNIV