59results about How to "Reduce the size of the inductor" patented technology

The invention relates to a three-state three-level PFC circuit, which comprises an inductor, a combined three-state switch, a first capacitor and a second capacitor. The inductor is connected between a first end of an AC power supply and a first end of the combined three-state switch; a second end of the combined three-state switch is connected at a first end of the first capacitor; a third end of the combined three-state switch is connected at a second end of the second capacitor; a fourth end of the combined three-state switch is grounded; and the first end of the first capacitor, a second end of the first capacitor, and the second end of the second capacitor output three-level voltage. The invention also provides a multi-state three-level PFC circuit correspondingly. Compared with the common circuit without a three-state switch or a multi-state switch, the PFC circuit provided by the invention can obviously reduce the dimensions of the inductor and the capacitors, improve the powerfactor of the circuit simultaneously and reduce the total harmonic content on the premise of maintaining the switch frequency and ripples on a passive device invariable, and can reduce the switch frequency and obviously improve the circuit efficiency on the premise of maintaining the input current ripple frequency and magnitude invariable.

The invention provides a single inductance double voltage reduction type half-bridge inverter working in half period and a control method thereof, belonging to the inverter and the control method thereof. The single inductance double voltage reduction type half-bridge inverter working in half period consists of a power supply circuit, a voltage reduction circuit and an output filter circuit which are connected one another in sequence, wherein the power supply circuit comprises a first DC power supply and a second DC power supply; the voltage reduction circuit comprises a first voltage reduction circuit and a second voltage reduction circuit; the first voltage reduction circuit comprises a first power switch tube, a first parasitic body diode, a first blocking diode, and a first afterflow diode; the second voltage reduction circuit comprises a second power switch tube, a second parasitic body diode, a second blocking diode, and a second afterflow diode; and the output filter circuit comprises an output filter inductance and an output filter capacitor. The control method obtains a high-low level drive signal of the power switch tube by a voltage and current dual-ring adjuster to realize the half period operation. The inverter has the advantages of small volume, light weight, small waveform distortion, high efficiency and no bias current.

The invention discloses a novel three-phase line voltage cascading VIENNA converter, and belongs to an AC/DC converter. The converter comprises three-phase alternating current power supplies which are in star connection, nine input inductors and three cascading VIENNA converters. According to the converter, the three-phase input line voltage cascading superposing connection way is adopted to lower the voltage stress of a switch tube and to improve the voltage level, so that the converter can be applied to high-voltage high-power level occasions; in addition, the direct current side can output same or different voltages to supply power to multiple paths of loads concurrently; the active power factor correction can be realized, and the total harmonic distortion (THD) can be lowered; compared with a three-phase fully-controlled type cascading H-bridge rectifier, 27 fully-controlled type electric power semiconductor devices can be reduced by the converters provided by the invention when each of the converter comprises three modules in the cascading connection; compared with a rectifier which adopts all the fully-controlled type electric power semiconductor device and adopts the same three-phase bridge line voltage cascading connection way, a half of the fully-controlled type electric power semiconductor device can be reduced by the converter provided by the invention; and in addition, the voltage withstand of the switch tube can be reduced by half, and the cost and the size of the converter are reduced consequently.

The invention discloses a novel high density integrated electric inductance manufacturing method, which comprises: (1) winding an varnished wire coil into a spiral shape; (2) making first iron magnetic powers into a magnetic core through mechanical pressing; (3) packing the magnetic core into a hollow cavity of the varnished wire coil; (4) packing the varnished wire coil packed with the magnetic core into an injection mold; (5) uniformly mixing and blending resin adhesive, coupling agent and accelerant to obtain high temperature resin adhesive; (6) uniformly mixing and blending the second iron magnetic powers and the high temperature resin adhesive to obtain magnetism composite material; (7) injecting the magnetism composite material into a mold cavity of the injection mold to mold, and solidifying to obtain external magnetic body; and (8) cooling and stripping to obtain molded electric inductance. According to the invention, the volume of the electric inductance manufactured with the method provided herein is small; the density is high; the relative magnetic conductivity is high; the cooling performance is good; the service life is long; the electric inductance is molded as a whole; and the manufacturing method of the electric inductance is simple, thus reducing the production cost.

The invention discloses an AAC-based multi-module voltage source type inverter. The AAC-based multi-module voltage source type inverter comprises an LC filter and a full-bridge structure which consists of at least four AAC bridge arms, wherein an H bridge fundamental frequency bridge arm leading-out terminal in an AAC upper bridge arm is connected with a power supply positive electrode output end; an H bridge fundamental frequency bridge arm leading-out terminal in an AAC lower bridge arm is connected with a power supply negative electrode output end; each AAC bridge arm comprises an H bridge unit, a bridge arm electric reactor and a bridge arm conduction switch; each H bridge unit comprises a fundamental frequency bridge arm and a high frequency bridge arm which are connected in parallel; the fundamental frequency bridge arm comprises two series-wound fully-controlled switches with anti-parallel diodes; an emitting electrode of one fully-controlled switch is connected to a collector electrode of the other fully-controlled switch; and the H bridge unit is connected with a voltage-stabilizing capacitor in parallel. The inverter provided by the invention is small in size, and can realize conversion from a low-voltage direct current to a high-voltage alternating current; the system frequency is increased by adopting carrier phase-shifting control; each power switching device suffers from relatively low direct current side voltage; and in addition, the AAC-based multi-module voltage source type inverter is easy to enlarge capacity.

The invention relates to a copper sheet embedded soft magnetic powder core inductor and a preparation method and application thereof. The copper sheet embedded soft magnetic powder core inductor comprises a copper sheet, the surface of the copper sheet is covered with a soft magnetic material, and the interface of the soft magnetic material and the copper sheet contains an insulating resin material; the copper sheet embedded soft magnetic powder core inductor has the characteristics of high density, high magnetic core permeability, high inductance value, high saturation flux density, small size and less magnetic flux leakage; and the copper sheet embedded soft magnetic powder core inductor replacing ferrite inductor with the same inductance is used in a low-voltage DC/DC converter circuit,the copper sheet embedded soft magnetic powder core inductor can obtain consistent or higher efficiency, and meanwhile, the size of the inductor can be reduced by more than half. The withstand voltage of the copper sheet embedded soft magnetic powder core inductor can reach more than 15V, and the preparation method of the copper sheet embedded soft magnetic powder core inductor is simple, high inproduction efficiency and suitable for large-scale automatic production.

The invention discloses a grid-connected inverter and a control method thereof. Key points of the technical scheme are that: the grid-connected inverter consists of six switch tubes, two diodes and two inductors, wherein four of the six switches are in the working frequency mode, the other two switches are in the high frequency mode, and only one switch is in the high frequency mode at moment, so that the switching loss is effectively lowered. In the circuit, a bridge arm is allowed to be connected directly, so that overcurrent is avoided, and high reliability is achieved. In the entire working period, voltages at the two ends of a grounding parasitic capacitor of a photovoltaic system do not contain any high-frequency component, so that the drain current is effectively restrained.

The invention discloses a high-efficiency photovoltaic power optimizer serial topology circuit. The circuit comprises photovoltaic arrays, optimizers and an inductor. The output end of each photovoltaic array is connected in parallel with one optimizer, all the optimizers are successively connected in series in an end-to-end mode to form an optimizer assembly string, and the optimizer assembly string is connected with the input end of an inverter via the inductor and a third switch tube. According to the invention, the optimizers share one inductor so that deviations in maximum power point tracking due to instability of the optimizers can be inhibited, at the same time, the volume of the overall inductor is reduced, materials are reduced, and the manufacturing cost is decreased; and the output line of the optimizer assembly string is provided with the third switch tube, when circuit currents tend to flow back or the currents are zero, the third switch tube is switched off, the currents flow through a third diode, voltage reduction loss of diodes of the circuit is enabled to be eliminated as much as possible when the currents are not interrupted, and the system efficiency is improved. The invention further discloses a control method of a high-efficiency photovoltaic power optimizer serial topology circuit.

The invention discloses an LCL filter with coupled inductors and belongs to the field of design of power electronic devices. The input end of an alternating-current voltage side inductor of the filter is connected with an alternating-current voltage source, a counteracting inductor is connected with the output end of the alternating-current voltage side inductor in parallel after being connected with a filtering capacitor in series, a damping resistor can be connected with the filter capacitor in series or in parallel, or the damping resistor can be not adopted, the alternating-current voltage side filtering inductor and a rectification or inversion side filtering inductor are coupled and connected in series in the forward direction, and the output end of the rectification or inversion side filtering inductor is connected with a middle point of a rectification or inversion bridge arm. According to the LCL filter with the coupled inductors, not only can the size of the filter be reduced, but also the filtering effect can be improved.

The invention relates to a bidirectional photovoltaic inverter based on high-frequency legs. The inverter is characterized by comprising at least one forward high-frequency N-cell leg, at least one backward high-frequency N-cell leg and two power-frequency P-cell legs in parallel connection, wherein each forward high-frequency N-cell leg is connected with one inductor to be used as the anode output end of a power supply, and each backward high-frequency N-cell leg is connected with one inductor to be used as the cathode output end of the power supply; and each forward/backward high-frequency N-cell leg is formed by connecting a diode with a high-frequency switch in series, and each power-frequency P-cell leg is formed by connecting a diode with a power-frequency switch in series. The inductors whose currents work in positive half waves are mutually coupled, and the inductors whose currents work in negative half waves are mutually coupled. The bidirectional photovoltaic inverter can be switched between a photovoltaic mode and an energy-storing mode at random, the size of the inverter is small, problems in direction connection can be avoided, current leakage can be effectively inhibited, the system frequency is increased, bidirectional power control is realized, and the capacity is easy to increase.

The invention relates to a suspension potential elimination circuit, which belongs to the technical field of direct current distribution networks. The circuit comprises a first winding with an iron core and an output end used for being connected with a DC/DC module in a direct current transformer, and a first capacitor. One end of the first capacitor is connected with the first winding, and the other end of the first capacitor is connected with a first resistor. The first resistor is connected with an iron core of the first winding. According to the suspension potential elimination circuit, the resistor is connected with the iron core of the first winding, and the resistor is connected with the capacitor, so that the iron core of the winding is electrically connected with the output side of the circuit; the suspension potential of the iron core in the direct current transformer is effectively reduced; the partial discharge phenomenon of the direct current transformer is avoided; and the safety and reliability of the direct current transformer are improved. The suspension potential elimination circuit is suitable for direct current transformers of various structures, such as directcurrent transformers of distributed cascaded topological structures, and can also be applied to power-frequency direct current transformers and high-frequency direct current transformers.

The invention relates to the technical field of electronics, in particular to an inductor and a method for manufacturing the same. The inductor comprises a wound varnished wire and an immobilizing membrane, wherein the varnished wire comprises two leading-out terminals, and the immobilizing membrane is arranged on the surface of the varnished wire and used for fixing the varnished wire. The inductor is at least used for solving the technical problems that in the prior art, an existing magnetic core magnetized inductor is large in size and weight and the application range is narrow.

The invention discloses a low ripple driving method of an alternating current motor. An adopted power topological structure comprises a high-frequency power switch, a high-frequency diode and a high-frequency direct-current filter inductor, six low-frequency power switches are connected with six low-frequency diodes and three alternating-current filter capacitors in series, and the rotor position,the speed, the stator current and the preceding-stage inductive current of the alternating-current motor are detected. During control, the current amplitude is controlled through high-frequency chopping of the high-frequency power switch, and the current phase is adjusted through the low-frequency power switch. According to the invention, the high-frequency power switch carries out high-frequencychopping, thereby facilitating the reduction of current ripples, and reducing the size of an inductor. The direct-current filter inductor realizes voltage stabilization without a large capacitor; theadoption of the low-frequency power switch is beneficial to the reduction of system cost and switching loss; the alternating-current filter capacitor improves the current harmonic performance and reduces adverse effects caused by high dv/dt; a post-stage control scheme with a constant modulation ratio facilitates the application of various modulation strategies.

A DGS lumped parameter low-pass filter based on a multilayer LCP technology is characterized in that a signal input port P1 and a signal output port P4 are symmetrically installed, and a first spiral inductor L1 and a second spiral inductor L2 are installed between the signal input port P1 and the signal output port P4; the first grounding port P2 and the second grounding port P3 are installed on the two sides of the signal input port P1, and the signal output port P4 and the third grounding port P5 are installed on the two sides of the signal output port P4. The filter has the beneficial effects that the filter is simple in structure and adopts a symmetric design, the design efficiency can be greatly improved, and a microwave passive device manufactured by utilizing a multilayer LCP process is small in size, high in stability and low in dielectric loss; inductors, capacitors and other passive devices can be embedded in the multi-layer structure substrate, traditional planar integration of microwave devices is converted into three-dimensional integration, the devices are smaller in size and higher in integration level, and the defected ground structure in the lumped parameter filter can effectively reduce the influence caused by parasitic parameters of the inductors and the capacitors.