5664results about "Ac-dc conversion without reversal" patented technology

A direct current (DC) fast charger for charging a battery of an electric vehicle (EV) includes a primary circuit having seven bidirectional switches electrically linked to a primary wire of a transformer and configured to receive an alternating current (AC) voltage; and a secondary circuit comprising a plurality of diodes arranged to rectify the AC voltage into a DC voltage, electrically linked to the secondary leads of the transformer such that the DC fast charger unidirectionally converts the AC voltage received at the primary circuit into the DC voltage output by the secondary circuit.

The present invention provides a wind power off-grid hydrogen production power supply topology and control method without a step-down transformer, including: obtaining wind speed data, using a wavelet threshold algorithm for denoising, predicting power based on an LSTM-GRU hybrid neural network, and extracting power fluctuation characteristics through multi-scale entropy analysis; obtaining load data, using Kalman filtering and recursive least squares to establish an impedance model, and extracting dynamic characteristics in combination with Hilbert transform; using a differential evolution algorithm for multi-objective optimization to generate an optimal switching sequence and power allocation strategy; achieving system control through space vector modulation, balanced control, soft switch control and harmonic compensation; achieving state estimation and disturbance suppression based on a sliding mode observer and a nonlinear observer; and achieving fault diagnosis and protection using a deep belief network. The present invention improves system efficiency and reliability and improves dynamic performance.

The invention discloses an emergency power supply quick access method based on scene recognition, which relates to the technical field of emergency power supplies, and comprises the following steps: in an emergency power supply system, firstly obtaining electrical input parameter information through a preset detection frequency; by introducing a load change evaluation mechanism based on machine learning, the system can identify load fluctuation in real time and dynamically adjust the detection frequency, and the response speed to the rapid change of the load is improved. Compared with a traditional detection method, the load state is intelligently evaluated and accurately divided, it is ensured that the power factor is adjusted in time when the load fluctuates violently, and power loss and waste are reduced. Correction is carried out according to the traditional frequency during stable load fluctuation, the frequency is dynamically adjusted during rapid fluctuation, the electric energy use is optimized, the electric power quality is improved, and harmonic distortion and overload risks are reduced.

A solid-state transformer is provided. The solid-state transformer includes a first stage, a first DC bus and a second stage. The first stage is configured to receive an AC power and convert the AC power into a first DC power. The first DC bus is electrically connected to the first DC power. The second stage is electrically connected to the first stage through the first DC bus, and is configured to perform isolated step-down DC / DC conversion on the first DC power to generate a second DC power. The first stage is configured to operate at a modulation index higher than 1, and the modulation index is defined by a ratio of twice AC voltage provided by the AC power to voltage across the first DC bus.

A multi-level conversion circuit and a cycle-by-cycle protection method therefor are provided. The cycle-by-cycle protection method includes steps of: (a) determining main switches and synchronous rectification switches; (b) controlling the main switches to operate in a normal mode; (c) detecting a current flowing through the inductor, and determining whether the current exceeds a threshold; (d) when the current exceeds the threshold, defining the main switch in an on state and having shortest turn-on duration as a target main switch, switching the target main switch to a current limiting mode for turning it off; and (e) after switching the target main switch to the current limiting mode, if the current is lower than the threshold, at a moment when a falling edge of control signals in a reference mode for the main switches first appears, switching the target main switch to a state in the reference mode corresponding to the moment.

The invention discloses a high-voltage circuit for an electric flame stove. The high-voltage circuit comprises a PFC circuit, a high-frequency conversion circuit, a boosting transformer, an energy coupling circuit and a voltage doubling circuit which are electrically connected in sequence. According to the EMI filter circuit, common-mode interference and differential-mode interference are filtered out, and pure alternating current input is provided for a back-end PFC circuit; two chips are adopted in the PFC circuit, so that the PFC circuit 300 finally realizes the consistency of the current waveform and the voltage phase; in the other embodiment of the invention, double chips are adopted, so that'fault linkage protection 'is realized; stable discharging of multiple groups of positive and negative electrodes is achieved through multiple groups of single energy coupling capacitors and independent voltage doubling rectifier bridges which are connected in parallel.

A control switch incorporating a 1:2 demultiplexer is used to control timing for a concurrent switching, break-before-make and make-before-break power multiplexing, and is configurable to link a plurality of the control switches into a control chain to perform sequential charging, sequential discharging, parallel charging, parallel discharging, and concurrent sequential charging and discharging for a plurality of batteries coupled to the control chain in a power system.

A multi-level conversion circuit and a cycle-by-cycle protection method therefor are provided. The cycle-by-cycle protection method includes steps of: (a) determining main switches and synchronous rectification switches; (b) controlling the main switches to operate in a normal mode; (c) detecting a current flowing through the inductor, and determining whether the current exceeds a threshold; (d) when the current exceeds the threshold, defining the main switch in an on state and having longest turn-on duration as a target main switch, switching the target main switch to a current limiting mode; and (e) after the target main switch is switched to the current limiting mode, if the current is lower than the threshold, at a moment when a rising edge of a control signal in a reference mode for the target main switch firstly appears, switching the target main switch to a state in the reference mode corresponding to the moment.

Embodiments of the present application discloses a totem-pole power factor correction circuit and a power supply equipment. The circuit includes a sampling unit and a detection control unit. The sampling unit includes a first sampling resistor and a second sampling resistor, the first sampling resistor being electrically connected between a second connection point and an anode of a first diode, and the second sampling resistor being electrically connected between the second connection point and a cathode of a second diode. The detection control unit may output a control signal through a voltage at both terminals of the first sampling resistor or the second sampling resistor or a voltage at both terminals of the first sampling resistor and the second sampling resistor connected in series to drive the third switch or the fourth switch to turn off, thereby effectively avoiding components damage caused by a late turn off of the third switch or the fourth switch.

An energy storage system comprises a set of swappable battery modules positioned in battery slots with a battery module being controlled by a control switch. The control switches are linkable to form a charging control chain and / or a discharging control chain respectively to control sequential charging / discharging, parallel charging / discharging, and segmented charging / discharging among the set of battery modules in the energy storage system. Methods to detect defective battery module in a battery slot are also presented. The energy storage system can be configured in an AC power distribution environment, a DC power distribution environment, or in an EV. The energy storage system is scalable, automatically reconfigurable and accepts AC power and regenerated DC power.

The disclosure describes an energy supply device for an electrolysis unit and an electrolysis installation comprising the energy supply device and an electrolysis unit connected thereto.

A radio frequency to direct current (RF-DC) converter for harvesting radio frequency energy includes an antenna circuit, and a plurality of cross-coupled differential-drive (CCDD) rectifier stage. The antenna circuit receives RF signals and outputs a positive signal at a positive RF terminal and outputs a negative signal output at a negative RF terminal. Each CCDD rectifier stage includes a first NMOS transistor, a first PMOS transistor, a second NMOS transistor and a second PMOS transistor. Each CCDD rectifier stage further includes two flying capacitors and two body capacitors. An input terminal is connected to a connection point between a source terminal of the first NMOS transistor and a source terminal of the second NMOS transistor. An output terminal is connected to a connection point between a source terminal of the first PMOS transistor and a source terminal of the second PMOS transistor.

In an ACDC power supply, voltage balance of each DC bus is achieved when power is unbalanced without using an additional balancing circuit or a multi-winding commercial transformer. The ACDC power supply includes an AC-DC converter ACDC, a primary side DC capacitor C1, an isolated DC-DC converter DCDC, and a secondary side DC capacitor C2. Each phase has m cells (m: an integer of 2 or more). A DC bus V is connected in series or in parallel to a plurality of secondary side DC capacitors C2. dc21 , V dc22 Multiple DC buses V dc21 , V dc22 The voltage is supplied to the load or power source. When a power imbalance occurs due to the load or power source condition, the voltage is output while maintaining the voltage balance between the secondary DC voltage and the primary DC voltage of each cell.

The charging and / or discharging of a set of swappable battery modules in a battery system is carried out automatically using a set of charging and / or discharging control switches linked in a sequential charging and / or a discharging control chain. The charging and discharging of the set of battery modules can be done sequentially or in parallel, and is hardware-based with minimal software / firmware involvement. The system is scalable and automatically reconfigurable for use in an infrastructure and / or in an electric vehicle. The swappable battery modules may be positioned in the battery slots or butted together in the battery system.

The charging and / or discharging of a set of swappable battery modules in a battery system is carried out automatically using a set of charging and / or discharging control switches linked in a sequential charging and / or a discharging control chain. The charging and discharging of the set of battery modules can be done sequentially or in parallel, and is hardware-based with minimal software / firmware involvement. The system is scalable and automatically reconfigurable for use in an infrastructure and / or in an electric vehicle. The swappable battery modules may be positioned in the battery slots or butted together in the battery system.

A power-over-Ethernet (PoE) PD / PSE device comprises a powered device (PD) interface configured to connect to an upstream power sourcing equipment (PSE) and receive input PoE power from the PSE, and a PSE interface configured to connect to a downstream PD and to supply output PoE power to the PD. The PD / PSE also comprises a device power rail to supply operational power to one or more components of the PD / PSE, and a DC-DC converter comprising a multi-output transformer comprising a transformer input, a first transformer output electrically connected to the PSE interface, and a second transformer output electrically connected to the device power rail. The DC-DC converter is configured to receive the input PoE power and, in response, supply the input PoE power to the transformer input, generate the output PoE power at the first transformer output, and generate the operational power at the second transformer output.

The present application relates to the technical field of micro inverters, and relates to a circuit topology of a micro inverter, and a control method. One specific implementation of the method comprises: measuring the maximum power value of a photovoltaic module, and receiving a current input by the photovoltaic module; acquiring a power grid voltage value in an alternating-current power grid, determining, on the basis of the power grid voltage value and the maximum power value of the photovoltaic module, a sine wave period corresponding to an output current, and on the basis of the sine wave period, controlling on and off of a plurality of switch transistors in a resonance circuit and a voltage doubling rectifying circuit in the micro inverter, so as to respectively form a conduction current loop in the resonance circuit and form an induction current loop in the voltage doubling rectifying circuit; and transmitting the sinusoidal output current to the alternating current power grid by means of the output end of the voltage doubling rectifying circuit. The implementation implements a control strategy for first-stage power conversion of the micro inverter, improves the efficiency of the micro inverter, increases the power of the micro inverter, and reduces the cost of the micro inverter.

The invention discloses an intelligent charging pile core module based on a VIENNA structure, an electric energy quality management method, system and equipment and a storage medium, and belongs to the field of electric power system energy storage equipment.The intelligent charging pile core module based on the VIENNA structure comprises the steps that an integrated power conversion unit is constructed, the power conversion unit adopts a VIENNA rectifier topology, three-phase alternating current is converted into direct current, and the direct current is converted into direct current; a harmonic suppression structure linked with the control interface is arranged; state information in the operation process is collected and serves as input of the control strategy module; based on the state information, a modulation control instruction is generated in the control strategy module to drive the switching action of the power conversion unit; on the basis of the modulation control instruction, the switch control is executed, meanwhile, the direct-current side midpoint potential of the power conversion unit is synchronously adjusted, and the distribution of direct-current bus capacitor voltage is controlled; and identifying the current operation condition according to the state information, switching to a control template corresponding to the operation condition in the control strategy module, and generating a modulation control instruction.

A powered device (PD) interface controller is provided that includes a switch and control circuitry. The switch controls current to a PD from a power sourcing equipment (PSE). The PD accepts power from a network cable over which data is carried, and the PSE provides the power to the network cable. The PD also accepts power from an auxiliary power source. The control circuitry detects a change-over from the auxiliary power source to the PSE as a source of power. The control circuitry turns on the switch to control the current to a short circuit current limit level, greater than a startup inrush current limit of the PD, for a period of time less than a short circuit time limit, to charge a bulk capacitor of the PD. The control circuitry turns on the switch fully to allow the current to flow towards the PD.

The invention discloses a bridge arm multiplexing type soft switching AC-DC converter and a control circuit and a control method thereof, and the bridge arm multiplexing type soft switching AC-DC converter carries out bridge arm multiplexing on a primary side switching tube of a full-bridge LLC resonant converter and a rear bridge arm switching tube of a bridgeless AC-DC converter. Power factor correction and soft switching of all switching tubes can be realized, and the number of devices is reduced. The control circuit comprises an output voltage regulating circuit, an input voltage regulating circuit, an output voltage controlled phase-shift clock generating circuit, an input voltage controlled phase-shift clock generating circuit and a switching signal gating circuit. According to the invention, global soft switching, electrical isolation and wide-range voltage regulation can be realized, the number of devices is effectively reduced, and high power density, high conversion efficiency and high reliability can be realized.

The invention discloses an optimized fault-tolerant control method suitable for a cascaded solid-state transformer. On the basis of the basic control link of the cascade converter, the bus voltage of each normally operating cascade module in the switching process and the bus voltage of the redundant module are detected, and according to the current modulation signal of each cascade module, the new modulation signal of each cascade module is dynamically calculated and obtained; the fluctuation of voltage and current in each stage of the switching process can be reduced. According to the invention, the problem that the current impact is too large when the whole system is switched due to the fault of one cascade module in the cascade converter is solved. According to the method, no additional circuit needs to be added, smooth switching of the cascade converter can be achieved when the fault occurs, the whole system can continue to work stably, and collapse of the whole system caused by over-current protection is prevented.

A multiple input converter for outputting power from AC power or a battery to positive and negative direct current (DC) buses is provided. The multiple input converter includes at least one bridge arm unit and a bidirectional DC-DC conversion unit. The bridge arm unit corresponds to one phase of the alternating current (AC) power and includes an upper and lower bridge arms that can independently form a two-level converter. In a battery mode, the upper and lower bridge arms discharge power from the rechargeable battery to the positive and negative DC buses, and the bidirectional DC-DC conversion unit discharges power from the rechargeable battery to the positive and negative DC buses or balances voltages of the positive and negative DC buses. In a mains mode, the bridge arm units are connected to the AC power. The bidirectional DC-DC conversion unit determine whether to charge or discharge according to load conditions.

The invention discloses a low-cost charging pile topology for a fast charging-slow discharging scene of an electric vehicle and a modulation strategy of the low-cost charging pile topology. According to the low-cost charging pile topology, a group of half-bridge type shunt diodes are connected in parallel to each phase of main bridge arm of a traditional T-shaped three-level converter. In the discharging mode, the charging pile is consistent with a traditional T-type three-level operation state, and works in a slow-release scene with rated power and below. In the charging mode, the charging pile continuously shunts the main bridge arm power device by using the additionally arranged shunting diode, so that the current stress and thermal stress of the main bridge arm power device are reduced; and through a self-adaptive modulation strategy of three-level / two-level modulation mode switching, the loss distribution of a power device is optimized, the active power output capability of the charging pile in a charging mode is improved, the fast charging operation of the charging pile with over-rated power is realized, the equipment capacity utilization rate of the charging pile is fully excavated, and the method has remarkable engineering application value.

The invention relates to a multi-electrode direct-current electric arc furnace, a submerged arc furnace power supply device and a smelting method, belongs to the technical field of industrial smelting, and aims to solve the problem of working condition of abnormal conductivity of furnace charge of the multi-electrode direct-current furnace. The device is composed of a phase-shifting transformer, a rectification module, a direct current conversion module, an isolation switch and other components, and all the components are connected according to a specific rule, so that a top electrode attribute conversion loop is formed in the device topology. By matching with the smelting method, cathode and anode attribute transformation of the multi-electrode direct current furnace top electrode can be realized, smelting can be performed through a top electrode loop under complex conditions of poor furnace charge conductivity and the like, and a normal production process can be recovered after a molten pool in the furnace appears and the furnace charge conductivity is enhanced, so that the abnormal fault processing time is shortened, and the production efficiency is improved. And the smelting efficiency of industrial smelting, especially in the fields of iron alloys and special steel, is improved.

Provided are a method for controlling a full bus load to discharge in a household electrical appliance and related apparatuses. In the method, in response to determining that a half bus load is turned on and a full bus load is turned off, a voltage difference between a first DC power and a second DC power is determined to obtain a voltage difference. The first DC power and the second DC power are obtained by converting three-phase power through a three-level active PFC unit. Subsequent to the voltage difference between the first DC power and the second DC power being determined, a full bus load is controlled to be turned on or off based on the voltage difference to stabilize a half bus voltage in a predetermined voltage interval.

A multi-phase resonant power converter includes: a power stage on a primary side of the multi-phase resonant power converter, the power stage including bridge converter legs each configured to receive an AC input voltage and implement a separate phase of the power converter; a transformer device having a primary side winding for each bridge converter leg and a secondary side winding for each primary side winding; a power circuit electrically connected to the secondary side windings on a secondary side of the multi-phase resonant power converter; a primary-side controller configured to operate the bridge converter legs at a switching frequency; and a separate resonant tank electrically connected to a midpoint of each bridge converter leg. Each resonant tank includes a resonant capacitor in series with the primary side winding for that bridge converter leg. A resonant frequency of each resonant tank is tuned to within + / −50% of the switching frequency.

The invention discloses a non-isolated DC / DC power converter and a power conversion apparatus. The non-isolated DC / DC power converter comprises a power module comprising a first power conversion circuit, the first power conversion circuit being a non-isolated DC / DC conversion circuit, a first output end of the first power conversion circuit is connected with a first inductor, and a second output end of the first power conversion circuit is connected with a second inductor; and an oscillation suppression module comprising a second power conversion circuit, a first terminal of the second power conversion circuit coupled in parallel to an input end of the first power conversion circuit, a first terminal current of the second power conversion circuit being in phase with at least partial of AC components of an input voltage of the oscillation suppression module, and the second power conversion circuit being a bidirectional DC / DC conversion circuit.

The invention is suitable for the technical field of inverters, and provides a parallel control method for inverters, which comprises the following steps: after a plurality of inverters are powered on and a parallel operation task is started, acquiring a time base counting register EPWM count value and a real-time clock RTC time value in the plurality of inverters; and then, based on the EPWM count value and the RTC time value, determining a controller area network (CAN) communication expansion frame of each inverter. And then, according to the CAN communication expansion frame of each inverter, determining a host inverter and a plurality of slave inverters from the plurality of inverters, and allocating CAN communication addresses to the plurality of slave inverters through the host inverter. According to the method, the master-slave relationship of the inverter is determined, and the CAN communication address is automatically allocated, so that the complexity of manually allocating the addresses of the master and the slave is avoided, and the conflict of the communication address is effectively reduced.

Systems, method, and computer readable medium are provided for a controller for a generator. The system includes a rectifier for converting a first AC signal generated by the generator to a first DC signal; a first DC-DC associated with energy storage and a first mode; a second DC-DC associated with an inverter and a second mode; a switch for alternately toggling between the first DC-DC and the second DC-DC, wherein the first mode prevents output to the electrical grid, and the second mode enables inversion of the second DC signal to a second AC signal via the inverter; and a processor that uses the indicator to operate the switch to operate the generator in the first mode when a connection to the grid does not conform with a parameter, and operate the generator in the second mode when the connection to the grid conforms with the parameter.

An electronic component. The electronic component includes a base; a first semiconductor device attached to the base and having: a first Gallium nitride (GaN)-based switch having a first gate, a first source and a first drain, the first gate arranged to control a current flow between the first source and the first drain; a second GaN-based switch having a second source, a second gate and a second drain, the second gate coupled to the first gate, and the second drain coupled to the first drain. In one aspect, the electronic component also includes a second semiconductor device attached to the base and having: a logic circuit coupled to the second source and arranged to detect a magnitude of the current flow; and a driver circuit coupled to the first and second gates, the driver circuit arranged to control on and off states of the first and second GaN-based switches.