255 results about "Inverter topology" patented technology

An aerosol delivery device is provided that includes a substrate configured to carry an aerosol precursor composition, and includes an induction transmitter, induction receiver and control component. The induction transmitter is configured to generate an oscillating magnetic field. The induction receiver is positioned in proximity to the substrate, and configured to generate heat when exposed to the oscillating magnetic field and thereby vaporize components of the aerosol precursor composition. The control component is configured to direct current to the induction transmitter to drive the induction transmitter to generate the oscillating magnetic field, with the control component being configured to direct the current according to a zero voltage switching (ZVS) inverter topology.

The invention in the simplest form is an improved variable speed engine / generator set with an integrated power conditioning system and control method, used to generate high quality AC power with optimum fuel efficiency and reduced emissions. The variable speed generator control scheme allows for load adaptive speed control of engine and generator field. The transformerless power inverter topology and control method provides the necessary output frequency, voltage and / or current waveform regulation, harmonic distortion rejection, and provides for single phase, or unbalanced loading.

A transformerless photovoltaic system that may benefit from inverter topologies more suitable for ripple current cancellation techniques is provided. In one exemplary embodiment, the system may combine basic modules of straightforward inverter topologies to meet requirements for higher power applications and may comprise a bipolar photovoltaic array, and a full-bridge inverter electrically coupled to the bipolar photovoltaic array. The full bridge inverter may comprise first and second inverter legs that may be arranged to energize two phases of a grid electrically coupled to the photovoltaic system. In one exemplary embodiment, switching signals applied to switching devices in each of the first and second inverter legs may be adjusted relative to one other to reduce ripple current therein, thereby reducing the size of components used by the system.

The present invention generally relates to power electronic switching circuits and in particular to inverter modules employing two or more controlled switches that can be used with reactive loads. An inverter circuit is provided which comprises first and second input terminals for being connected to a DC power source; first and second output terminals for outputting an AC voltage; at least one metal oxide semiconductor field effect transistor, MOSFET, having a parasitic body diode. The inverter circuit further comprises at least one disabling element for disabling said body diode. This may result in an improved efficiency of the inverter circuit in combination with a reactive power capability. Further, a semiconductor switching device is disclosed, comprising at least one metal oxide semiconductor field effect transistor, MOSFET, and at least one insulated gate bipolar transistor, IGBT, wherein said MOSFET and said IGBT are connected in parallel.

An inverter system for delivering energy from a source of direct current (dc) to an alternating current (ac) utility is provided. The inverter system comprises a dc / dc converter coupled to the source of dc for synthesizing a time-varying current from the dc, an output inductor coupled to the dc / dc converter, and an inverter coupled to the output inductor for supplying the time-varying current to the ac utility in phase with a voltage of the ac utility.

The invention in one embodiment is an improved variable speed engine / generator set with an integrated power conditioning system and control method including load shedding to generate high quality AC power with improved fuel efficiency and reduced emissions. The variable speed generator control scheme allows for load adaptive speed control of engine and generator field. The transformerless power inverter topology and control method provides the necessary output frequency, voltage and / or current waveform regulation, harmonic distortion rejection, and provides for single phase, or unbalanced loading.

A step wave power converter comprises multiple different bridge circuits configured to convert DC voltage inputs into AC voltage outputs. A controller is configured to estimate an average voltage output from the multiple different bridge circuits for controlling the current output from the multiple different bridge circuits. The number of bridge circuits needed to provide the estimated average output voltage is identified and the identified bridge circuits controlled during a next switching period to generate a combined inverter output voltage that corresponds with the estimated average output voltage.In another embodiment, one or more transformers are associated with the different bridge circuits. Inductors are coupled between the bridge circuits and the primary windings of the associated transformers. The inductors filter the current output from the bridge circuits prior to feeding the current into the transformers.

The present invention provides a LC series resonance high frequency chain matrix-type inverter topology and a resonance modulation method thereof. The topology comprises of a full bridge LC series resonance inverter, a high-frequency transformer T, a matrix converter and a CL-type filter which are connected in order. The modulation method is configured to process the SPWM wave through separation and link semi-excitation modulation logics to obtain driving signals of a transformer pre-stage LC series resonance inverter and a transformer post-stage matrix converter so as to allow the work duty ratio of the transformer pre-stage resonance circuit excitation resonance work state in the resonance half period to be controllable and realize the control of energy side transmission to the output load. The transformer post-stage matrix converter is modulated and decoupled to two common current-type inverters for controlling, a switch tube performs switching during the zero current outputting to realize zero current switching to avoid causing voltage overshoot problems and realize energy bidirectional flow and four-quadrant operation. The power transformation grades are few, the control method is simple, the circuit stability is high, and the like.

An inverter is provided for controlling application of voltage from a power source to a motor having a plurality of windings. The inverter includes a first set of one or more switching elements and a second set of one or more switching elements. The first and second sets of one or more switching elements are connected between a high voltage side and a low voltage side of the power source. Each of the first set of one or more switching elements is connected to one of a first set of nodes, where each of the first set of nodes is connected to a first winding end of one of the plurality of windings of the motor. Each of the second set of one or more switching elements is connected to one of a second set of nodes and each of the second set of nodes is connected to a second winding end of one of the plurality of windings.

The embodiment of the invention, which belongs to the energy field, provides a topological circuit of an inverter and an inversion method thereof, and an inverter. Therefore, losses on opening and turning off of a high frequency switch can be prevented; working efficiency and a utilization rate of electric energy can be enhanced; a wide-range voltage input is realized; and a common-mode leakage current generated by a circuit of an inverter can be prevented, thereby improving security. The topological circuit of an inverter is characterized in that: a fifth switching tube, a sixth switching tube, a fifth diode, a sixth diode, and a first capacitor are added on a current inversion circuit containing a bridge arm; the fifth switching tube is in parallel connection with the fifth diode; and the sixth switching tube is in parallel connection with the sixth diode. Besides, an anode of the fifth diode is connected with a cathode of a direct current source as well as a cathode of the fifth diode is connected to a connection circuit between a second inductor and an alternative current source; and an anode of the sixth diode is connected with the cathode of the direct current source as well as a cathode of the sixth diode is connected to a connection circuit between a first inductor and the alternative current source. The embodiment of the invention is used for manufacturing of an inverter.

A circuit structure for LCD backlight is disclosed in the present invention. The circuit structure includes an inverter topology, a current balance circuit, and a plurality of loads. The current balance circuit is coupled to the plurality of loads and capable of balancing current of N loads by using N / 2-1 balance chokes. The circuit structure may further include a protection circuit which is coupled to the low voltage sides of the plurality of loads. The protection circuit is capable of sensing lamp voltages and providing a feedback signal to a controller. Furthermore, the protection circuit is composed of count-reduced and cost-competitive electronic elements.

Systems, methods, and devices relating to power converters. A power conditioning system uses multiple DC / DC power converter blocks. The output of each of the converter blocks is received by an energy storage and combiner block. The output of the combiner block is then received by a DC / AC inverter. The various components of the power conditioning system are controlled by a central controller. The power semiconductors within each DC / DC converter are controlled by a subsystem of the central controller and MPPT is also provided by the central controller. Also provided for are a novel three-phase DC / AC inverter topology with reduced output ripple and a control scheme for controlling the power semiconductors in the DC / AC inverter.

The present invention discloses a topological structure of a inverter, which comprises a solar panel, a high-frequency transformation circuit, and a DC-AC inversion circuit. The input end of the DC-AC inversion circuit is directly connected with the two ends of the solar panel; the original side of the high-frequency transformation circuit is connected with the output end of the DC-AC inversion circuit, and the auxiliary side is connected with the input end of a bridge type rectification circuit; and the output end of the bridge type rectification circuit is also connected with a power frequency switching circuit. The topological structure of the inverter lowers the loss in the inversion, reduces the wiring space, improves the transforming conversion efficiency, decreases the cost and reduces the electromagnetic interference.

The invention relates to an LC series resonance high frequency chain matrix type half-bridge inverter topology and a modulation method. The topology comprises a half-bridge LC series resonance inverter, a high-frequency transformer T, a matrix converter and a CL type filter. The modulation method comprises steps that SPWM waves generated in a SPWM signal generation link are processed through series resonance modulation logics to acquire driving signals of a transformer front-level LC series resonance inverter and a transformer back-level matrix converter, a work duty ratio of an excitation resonance work state of a transformer front-level resonance circuit is made to be controllable within a half period, and output load side energy transmission control is realized; the transformer back-level matrix converter is taken as a common current type inverter to control, switching of a switch tube during a transformer zero current output period is carried out to realize a zero current switch, a voltage overshoot problem caused by break of a transformer secondary side leakage current flow path can be avoided, and bidirectional energy flow is realized. The method has advantages of small-quantity power conversion grades, small-quantity switch tubes, simple control and high circuit stability.

The invention discloses a dynamic voltage restorer (DVR) for realizing smooth switching of different operation modes of a microgrid. The DVR uses a hybrid cascade H-bridge multi-level inverter topological structure as a main-body frame. A DC energy storage unit adopts a built-in wind turbine generator-storage battery of the microgrid and is serially connected between a power distribution network and a sensitive load in the microgrid through a filtering unit. The DVR is capable of working at three kinds of operation modes with the microgrid: a grid connection operation method, a grid-connection-to-island switching operation method and an island method. When it is detected that a microgrid system is to switch between two kinds of operation modes, the DVR rapidly moves and injects a compensation voltage to the system so that the microgrid is capable of smoothly transiting from one operation mode to the other operation mode. The DVR ensures the power supplying reliability of the sensitive load in the microgrid; and a transient electric energy quality problem which happens in the microgrid can be solved and a standby state of an original DVR is reduced in a large degree and thus device utilization rate is improved.

Parallel plate bus structures are commonly used for high-current applications where low inductance is a requirement. Such bus structures are very well suited for inverter topologies used to convert from DC to AC power and a capacitor is needed to minimize ripple on the DC bus. The present invention provides a method of integrating an annular form factor wound film capacitor into a parallel bus structure to provide a compact geometry with minimal inductance. Furthermore, the capacitor acts as the dielectric spacer between the bus plates, which eliminates the need for separate capacitor terminals and provides the lowest possible profile.

The invention discloses a three-phase inverter topology structure with adjustable DC bus voltage and a method of adopting the structure to realize dynamic DC bus voltage adjustment, which belong to the field of high-speed motor spindle driving control, and solve the problem that the existing inverter topology structure results in huge torque ripple in a controlled high-speed motor, applied square wave voltage during the control process generates current harmonics rich in a harmonic spectrum, and thus, loss in the motor is increased abruptly. The topology structure comprises a three-phase rectifier bridge, a DC bus supporting capacitor, a DC bus input voltage detection module, a Buck-Boost voltage adjusting circuit, a DC bus output voltage stabilizing capacitor, a DC bus output voltage detection module, a three-phase half-bridge inverter circuit, a three-phase current detection module and a driving control circuit. The dynamic bus voltage adjustment method is realized by adopting a DC bus voltage online dynamic adjustment strategy and a sensorless control strategy. The structure and the method are mainly used to dynamically adjust the DC bus voltage according to a motor operation state.

The invention belongs to the technical field of power electronic application, and especially relates to a wide-input direct current inverter topology and a feedforward average current control method thereof. The wide-input direct current inverter topology comprises a two-transistor Buck-Boost inverter and an interleaved two-transistor Buck-Boost inverter. The feedforward average current control method applicable to the wide-input direct current inverter topology is composed of an input voltage feedforward module, a mode switching module, a voltage outer ring and a current inner ring. According to the method, input voltage feedforward is introduced into the current inner ring in average current control, a feedforward function from the input voltage feedforward to the current inner ring is computed, simplification is carried out, thereby obtaining feedforward average current control applicable to practical application, and the input dynamic response performance of the inverters in a whole input voltage range is greatly improved; and moreover, by adoption of an interleaving technology, the conversion capacity is increased, the output current ripple is effectively reduced, and the support is provided for the field with wide range input and high power conversion.

The invention is an electrical power conversion topology. The preferred embodiment is as a three-phase, on-line Uninterruptible Power Supply (UPS). The desired AC output voltage waveform is formed on each output line or phase of the UPS, using pulse modulation techniques and a smoothing output filter inductor. A semiconductor switching matrix is used to switch the power converter side of each output filter inductor between three voltage potentials, a positive battery potential, a negative battery potential and a third intermediate and varying AC potential synchronized with the desired output voltage. The invention potentially provides the same performance as that of a multi-level inverter topology approaching an infinite number of DC levels.

The invention provides inverter topology in high frequency application. The inverter topology comprises a first capacitor, a second capacitor, a first power switch tube, a second power switch tube, a third power switch tube, a fourth power switch tube, a second diode and a third diode, wherein each power switch tube comprises a reversely parallel parasitic body diode; the first capacitor and the second capacitor are in series, the two ends of the first capacitor and the two ends of the second capacitor are respectively connected to a positive DC (direct current) bus and a negative DC bus so as to provide DC input and output; a connection part of the second power switch tube and the third power switch tube is connected with an inductor so as to provide AC (alternating current) output; the first power switch tube and the fourth power switch tube are respectively connected with a reverse fifth power switch tube and a reverse sixth power switch tube in series, and each power switch tube comprises the reversely parallel parasitic body diode so that the follow current flowing the parasitic body diodes of the first power switch tube and the fourth power switch tube is blocked by controlling the switch on and off of the fifth power switch tube and the sixth power switch tube; meanwhile, the positive DC bus and the negative DC bus are respectively connected with a separate first diode and a separate second diode in parallel to provide a follow current circuit.

The invention discloses a single-phase photovoltaic grid-connected inverter based on ripple power transfer and a modulating control method. Based on the thought of 'energy transfer', second power of a direct-current side capacitor is transferred to an inductor element by adding one degree of freedom of control into the inverter, and a novel inverter topology structure based on a ripple power transfer circuit is constructed. By combining a grid-connected current control link, a modulation method and system control strategy of the new topology is given. Analysis proves that by the novel single-phase single-stage inverter, second power disturbance can be effectively controlled, second ripple components are inhibited, photovoltaic system efficiency and grid-connected current quality are improved, alternating current in a power inductor is guaranteed, and influence on system reliability and efficiency due to direct-current bias current of the inductor is avoided. Simulation and experiment results verify reasonability and effectiveness of the novel inverter and the modulating control strategy.

The invention discloses a diode clamp type five-level photovoltaic inverter and a power supply system using the same, belonging to the technical field of the solar photovoltaic power generation. The direct current output from a solar photovoltaic battery is inverted into the alternative current and output to the inverter of an electric network, each path of the direct current input is subjected to independent maximum power point tracking control by a booster circuit, the efficiency of a solar panel is completely exerted, the direct current is then high effectively inverted by the multi-level inverter, the power generation efficiency of the whole system is high, harmonic wave injected into the electric network is small and the influence on the electric energy quality of the electric network is reduced. An inversion main circuit is connected with an inversion controller. The inversion main circuit comprises a direct current bus bar and three bridge arms in a same structure, a direct current input end of each bridge arm is connected with the direct current input and an alternative current output end of each bridge arm is connected with the electric network. The inverter topology has the following features: the switch stress dv / dt born on a switch device is small, the dynamic voltage sharing problem is not present and the static voltage balance can be realized without extra devices.

The invention provides an inverter topological structure used for dual motors. The inverter topological structure comprises a positive bus, a negative bus, a first capacitor, a second capacitor, a first switching tube bridge arm, a second switching tube bridge arm, a third switching tube bridge arm, a fourth switching tube bridge arm and a fifth switching tube bridge arm, wherein the first capacitor and the second capacitor are connected in series between the positive bus and the negative bus; a first motor of the dual motors is connected with the first capacitor, the second capacitor, the first switching tube bridge arm and the second switching tube bridge arm separately to form control connection between the first motor and a three-phase four-switch inverter; and the second motor of the dual motors is connected with the third switching tube bridge arm, the fourth switching tube bridge arm and the fifth switching tube bridge arm separately to form control connection between the second motor and a three-phase voltage type full-bridge inverter. The inverter topological structure used for the dual motors provided by the invention can realize actual independent control; and the control is simpler and the control effect is better.

The invention discloses a feedforward control method for improving the adaptability of an LCL type grid-connected inverter to a power grid. The method comprises the steps that 1, a capacitance current ic, a network connecting current ig and a grid-connected point voltage vpcc are detected to obtain sampling signals ics, igs and vgs of the capacitance current ic, the networking current ig and the grid-connected point voltage vpcc; 2, the sampling signals are input to a current controller, and vrl is output after operational processing; 3, the signal vgs is input into a grid-connected coupling point voltage low-order harmonic selector, and vr2 is output through data processing; 4, vr1 and vr2 are added, a modulation signal vm is obtained and input to a PWM generator, and a PWM signal is generated to control a switching tube of an inverter topology. Feedforward control is carried out by selecting grid-connected point voltage low-order background harmonics, the stability of a grid-connected inversion system and power grid voltage low-order background harmonic suppression are considered, and the adaptability of the system to the power grid impedance wide range changes is improved.

The inventiondiscloses a five-level neutral-point clamping type inverter topology with a self-balance auxiliary bridge arm, wherein the topology is mainly applied to the high-power wind power system and medium-high-voltage motor speed regulation fields as well as occasions of high-power active filtering and reactive compensation and the like. According to the topology, the main circuit comprises a direct-current bus capacitor, a self-balance flying capacitor auxiliary bridge arm, and a 5L-NPC inverter. With introduction of the self-balance flying capacitor auxiliary bridge arm, an inherent problem of potential unbalancing of the direct-current bus capacitor neutral point of the 5L-NPC inverter can be solved. According to the traditional auxiliary circuit, a controlled voltage source is used for generating a current at an electric reactor and thus the unbalanced current of the neutral point of the inverter can be offset, thereby realizing potential balancing. Unlike the traditional circuit, the provided self-balance auxiliary circuit uses the unbalancing current of the neutral point of the inverter to charge or discharge two flying capacitors and the voltages of the flying capacitors can be maintained to be constant; and the neutral-point potential balancing is realized automatically based on the capacitor clamping principle.

The invention discloses a topology main circuit of a zero-voltage soft switching arc welding inverter, which comprises a leading leg, a lagging leg and a full-bridge phase-shifting resonance circuit. The leading leg and the lagging leg are formed by high-power insulated gate bipolar transistors; the full-bridge phase-shifting resonance circuit consists of inverse parallel diodes of the transistors and parallel capacitors of the transistors; the full-bridge phase-shifting resonance circuit is accessed to a primary side of a high-frequency transformer through a resonance inductance and leakage inductance; a secondary winding of the high-frequency transformer outputs inverted power supply; the front end of the resonance inductance is connected with a current sampling winding in series; the secondary inductance is connected with the winding of the high-frequency transformer after the secondary inductance is connected with an electric switch; and the electric switch is connected with a control circuit, and samples primary current of the high-frequency transformer through the current sampling winding. The topology main circuit realizes switching of the electric switch by the control circuit, can increase the primary current value of the transformer by opening the electric switch under idle load and light load, and can reduce circulating current of the circuit and increase power factor by cutting off the electric switch during over loading, thereby avoiding a magnetic core heating severely so as to damage elements and devices, and realizing zero-voltage switching of all main power devices in a loading range.

The invention discloses a control type soft-switching technology for an inverter, and belongs to the field of power electronic converters. The control type soft-switching technology for the inverter is suitable for the traditional full-bridge inverter topology with low power and the traditional half-bridge inverter topology with low power. According to the soft-switching technology, a zero voltage switch environment of a switch device is built by controlling the positive direction, the negative direction and the reverse direction of the output inductive current in one cycle. For the three modulation modes of the inductive current, a digital-analog hybrid control circuit and method which are simple and easy to implement are provided. The control type soft-switching technology for the inverter has the advantages of being high in efficiency, small in size of a passive element, low in cost and the like and is especially suitable for small-power application occasions.

The invention discloses a single-phase five-level inverter with a battery energy balance function. The inverter consists of a half-bridge two-level inverter, a three-level diode-clamped inverter, a bilateral switch and two filter inductors. In an inverter topological structure provided by the invention, redundant switch combinations exist on a part of levels, but electric energy charging and discharging situations of an energy storage battery on a direct-current side are different in different switch states. Balance of battery energy can be realized by means of selecting the redundant switch combinations. Compared with a conventional five-level inverter, the single-phase five-level inverter has the advantages that a quantity of switching devices is reduced, and the reliability is enhanced. A voltage and an electric quantity of a battery (capacitor) can be balanced, so that the problem of imbalance of the electric quantity of the battery (capacity) on the direct-current side caused by charging imbalance can be solved when shadows or hot spots occur on a local photovoltaic panel.

The invention discloses a high-efficiency wide-load-range three-phase micro-inverter and a control method thereof. The high-efficiency wide-load-range three-phase micro-inverter includes a front stage DC-DC converting module used for transmitting electric energy output by a photovoltaic assembly and tracking the maximum power point of the photovoltaic assembly; a middle-stage quasi-third harmonic injection circuit used for injecting AC current meeting power grid connection condition obtained through combination of inverted six-pulse DC current output by the front-stage circuit and quasi-triangular wave output by said circuit; a rear-stage bridge-type inverting circuit, filtering circuit and power grid used for performing inversion on current output by a power optimizing module, filtering the current obtained through combination of the inverted current and the quasi-triangular wave output by the quasi-third harmonic circuit through the filtering circuit and injecting the current into the power grid. The invention also discloses methods for analyzing and designing the quasi-third harmonic injection circuit and extracting ad controlling quasi-third harmonic wave injection current reference signals. The three-phase micro-inverter has characteristics of being simple in structure, high in converting efficiency and small in size.