32results about How to "Increase the ripple frequency" patented technology

The invention provides an alternating current (AC) to direct current (DC) power converter, which comprises a phase-shifting transformer, at least one rectifier group and at least one DC-DC converter, wherein the phase-shifting transformer is provided with a primary winding and at least one secondary winding; at least one secondary winding is set as at least one winding unit; each rectifier group is provided with at least one rectifier; each rectifier is electrically connected to the secondary winding in the corresponding winding unit; and at least one DC-DC converter is electrically connected to the corresponding rectifier group and outputs predetermined DC voltage. Correspondingly, the invention also provides a DC charging station. By the invention, the phase-shifting transformer is provided with at least one secondary winding which is set as at least one winding unit, so different phase-shifting angles can be provided according to the actual quantity of windings in each winding unit, harmonic components in current are decreased, and power factors of a system are increased.

The invention relates to a three-phase tri-level LLC resonant converter, which comprises an inverter, a three-phase transformer, a resonant circuit, a three-phase rectification circuit and a filter circuit, wherein the inverter is formed by connecting three tri-level bridge arms in parallel; the resonant circuit is formed by three groups of resonant capacitors and resonant inductances that are connected and three excitation circuits of the three-phase transformer; the three-phase rectification circuit is connected with the secondary edge of the three-phase transformer; and the filter circuit is connected with the output end of the three-phase rectification circuit. The three-phase tri-level LLC resonant converter is provided with a partial voltage capacitor used for equally dividing an input voltage source into two voltage sources with the voltage being half of the input voltage source; the three-phase tri-level LLC resonant converter is also provided with three groups of clamping circuits with zero-potential points being connected with the central point of the partial voltage capacitor, and the voltage stress endured by each switching pipe is clamped into half of the input voltage. The invention solves the problem that that the ripple current of an output filter circuit of a half-bridge LLC resonant converter, and the voltage stress of each switching pipe is half of the input voltage; in addition, the ripple frequency of the output current of the output filter circuit is improved by 6 times of the frequency of the switching pipe, and a filter element with smaller volume can be adopted, so that the volume of the output filter circuit is reduced.

The invention discloses an isolated three-level bidirectional DC-DC converter with a coupling inductor. The isolated three-level bidirectional DC-DC converter comprises a high-voltage side input capacitor, a low-voltage side input capacitor, a high-voltage side power supply, a low-voltage side power supply, a first power switching tube, a second power switching tube, a third switching tube, a fourth power switching tube, a first diode, a second diode, a third diode, a fourth diode, a first coupling filter inductor, a second coupling filter inductor, wherein the first coupling filter inductor and the second coupling filter inductor are coupled to each other. The isolated three-level bidirectional DC-DC converter has the advantages of small output current ripple and low loss of switching tubes, and is also relatively simple in structure.

The invention relates to the technical field of photovoltaic grid-connected inverters. A photovoltaic inverter employing a hybrid type power device comprises two parts, namely, a power inversion unit and an inversion control unit, wherein the power inversion unit mainly comprises an input EMI (Electro-Magnetic Interference) filter circuit, an interleaving Boost boosted circuit, a full bridge inversion circuit employing a mixer and an output grid-connected filter circuit; the inversion control unit mainly comprises a power grid phase detection circuit, a sampling circuit and a controller. The photovoltaic inverter adopts a double-stage structure, and the first stage adopts interleaving Boost boosted voltage, so that the fluctuation of current is reduced, and output voltage ripple is reduced; the later stage inversion unit adopts a hybrid power device, so that the inversion consumption is effectively reduced, and the system efficiency is improved. The photovoltaic inverter has the characteristics of simple structure, easiness in circuit control and convenience in capacity expansion.

An apparatus of a hybrid power modulator using interleaving switching is provided. The apparatus includes a linear switching unit for generating an output signal by comparing an envelope input signal and a feedback signal, an interleaving signal generator for generating an interleaving switching signal arranged not to supply the signal to input stages of P-type Metal-Oxide-Semiconductor (MOS) Field Effect Transistors (FETs) and N-type MOS FETs of power cells at the same time by comparing the output signal and a reference signal, and a switching amplifying unit for determining a level of the switching signal using the interleaving switching signal. Hence, the hybrid power modulator using the interleaving switching method in the envelope signal of the wide bandwidth maintains high efficiency and high linearity. In addition, the buck converter can use the single inductor by preventing the simultaneous on / off of the power cells.

An electric vehicle drive DC-DC converter and an electric vehicle are provided in which the electric vehicle drive DC-DC converter is constructed by connecting a plurality of DC-DC converter units in parallel, and in which a smoothing capacitor is allowed to be reduced in size thereof so that the DC-DC converter unit can be constructed in a small size, and electric power required by the electric vehicle can be coped with by only increasing the number of DC-DC converter units. Each of the DC-DC converter units includes: a coil having both ends thereof being connected to a DC power source and an electric vehicle drive source (motor); and a drive element which is connected in parallel to the electric vehicle drive source and driven in response to a signal supplied from a control circuit, the drive element having combined therewith a load current commutation diode. A single smoothing capacitor is connected in parallel to the electric vehicle drive source so that the respective drive elements of the plurality of DC-DC converter units are driven by the control circuit at different timings.

Provided in the invention is a composite power factor correction circuit comprising a power circuit and a control circuit. The control circuit is connected with the power circuit and is used for generating M*N-path phase-shift drive pulse signals and inputting the signals into the power circuit. The power circuit includes a rectifier bridge, M boost inductors, and an electrolytic capacitor; the output terminal of each boost inductor is respectively with N power devices; a positive terminal of the electrolytic capacitor is connected with a common terminal of negative output terminals of M backward fast recovery diodes to form a second positive output terminal; and a negative terminal of the electrolytic capacitor is connected with an emitter common terminal of M*N power devices to form a second negative output terminal. Besides, the control circuit includes a voltage outer-loop controller, M current inner-loop controllers, and a carrier generator; and each of the current inner-loop controllers is connected with N phase-shift comparison drivers. According to the invention, the power level can be effectively improved; the boost inductor design is simplified; the model selection and installation of the power devices can be realized conveniently; and the total cost is lowered.

A voltage converter includes a first circuit and a second circuit. The first circuit includes two or more reactors and at least one switching element. One terminal of each of the reactors is connected in parallel with respect to a power source. The at least one switching element is connected to the other terminal of each of the reactors. The second circuit includes at least one rectifier of which one terminal is connected to the electrical load. The second circuit shares with the first circuit the at least one switching element connected to the at least one rectifier. The first circuit is connected such that the power source charges the respective reactors when the at least one switching element is turned ON. The second circuit is connected such that the reactors discharge power to the electrical load when the at least one switching element is turned OFF.

The invention discloses an AC and DC dual-use energy storage and power regulation device and a control method thereof. The device comprises 3n cascaded H bridge units, 3n energy storage units, an AC output interface circuit, a DC output interface circuit and a central controller unit. The on-off state of an AC circuit breaker of the AC output interface circuit and a DC circuit breaker of the DC output interface circuit is controlled through the central controller unit, the energy storage device works in an energy storage inverter mode to be accessed to an AC power grid, or works in an energy storage DC converter mode to be accessed to a DC power grid; and the central controller unit adopts a corresponding control strategy to realize power dual-way controllable flow according to the work mode of the energy storage device. Through controlling different work modes of the energy storage device, the phenomenon that the energy storage system is accessed to an AC and DC hybrid microgrid is configured and managed flexibly, conversion of the power between AC and DC buses is realized more high efficiently, the power storage and transfer efficiency is improved, and the stability of the AC and DC hybrid microgrid is improved.

The invention discloses a unidirectional DC voltage conversion device and system and a control method thereof. The unidirectional DC voltage conversion device is composed of a front-stage switch circuit, a back-stage switch circuit, a front-stage circuit, a front-stage auxiliary isolation switch, a back-stage auxiliary isolation switch and a power main circuit. The main power circuit consists of afully controlled H-bridge circuit, a high-frequency transformer, a resonant element, an uncontrolled H-bridge circuit and an input / output capacitor. The upper and lower arms of each half-bridge of the uncontrolled H-bridge circuit are composed of a plurality of series diodes. Combine the front and back switching circuits and isolation switches. The one-way direct current voltage conversion devicecan adopt multiple units to combine freely in series and parallel, Combined with series diode technology, it can greatly reduce the number of unidirectional DC voltage converter, reduce the cost of the system and increase the power density of the converter in high voltage system.

The invention discloses an MMC bidirectional DCDC converter for a super capacitor energy storage system. The MMC bidirectional DCDC converter comprises four parts: an MMC energy storage system, single current loop control, grading ring control and energy control. A system achieves current and voltage equalization decoupling control, and provides a modular double closed-loop decoupling control strategy. Based on the independent DC grid voltage control target, an energy storage management strategy based on grid-side voltage and the super capacitor SOC is provided. The system can help to reduce the contradiction between the low voltage of a super capacitor individual and the high voltage of an application occasion. The MMC-based energy storage system increases the ripple frequency of the inductive current by N times while reducing the voltage and the current stress of a switch device, and has great help to reduce the volume and the weight of the inductor.

An apparatus of a hybrid power modulator using interleaving switching is provided. The apparatus includes a linear switching unit for generating an output signal by comparing an envelope input signal and a feedback signal, an interleaving signal generator for generating an interleaving switching signal arranged not to supply the signal to input stages of P-type Metal-Oxide-Semiconductor (MOS) Field Effect Transistors (FETs) and N-type MOS FETs of power cells at the same time by comparing the output signal and a reference signal, and a switching amplifying unit for determining a level of the switching signal using the interleaving switching signal. Hence, the hybrid power modulator using the interleaving switching method in the envelope signal of the wide bandwidth maintains high efficiency and high linearity. In addition, the buck converter can use the single inductor by preventing the simultaneous on / off of the power cells.

The invention provides an open-loop charge pump circuit capable of increasing an output voltage ripple frequency. The open-loop charge pump circuit comprises an overvoltage protection signal generation module, a work clock generation module, a boost control signal generation module, a boost module and an output voltage ripple detection and control module, wherein an input end of the overvoltage protection signal generation module is connected with an output end of the boost module, and an output end is connected with an input end of the boost control signal generation module; an output end of the work clock generation module is connected with an input end of the boost control signal generation module; an output end of the boost control signal generation module is connected with an input end of the boost module; and an input end of the output voltage ripple detection and control module is connected with an output end of the overvoltage protection signal generation module, and an output end is connected with an output end of the boost module. According to the invention, the output voltage ripple detection and control module is added on the basis of an original open-loop charge pump circuit, so that the problems of low tone quality and the like, which are caused by a too low voltage ripple frequency, are solved.

The invention discloses an open-loop charge pump. The open-loop charge pump is provided with a peak current limiting control circuit between a control circuit and a boosting circuit, drives the peak current limiting control circuit based on an overvoltage protection signal through the control circuit, and controls the boosting circuit to be in a charging phase or a discharging phase through the peak current limiting control circuit. When the output voltage is greater than an upper threshold voltage, the boosting circuit continues to be in the charging phase and stops powering an output load, and the output load is powered through discharging of an output capacitor. When the output voltage is less than a lower threshold voltage, the boosting circuit is in a normal operating mode. Thus, themusic noise problem caused by that the ripple frequency of the output voltage by the charge pump is within an audio range can be avoided, and the sound quality is improved.

The present invention specifically relates to a modularization subway energy feedback apparatus. To overcome a defect in the prior art that various power level requirements cannot be flexibly met, the present invention provides a series-parallel connection structure-based modularization subway energy feedback apparatus. The apparatus comprises: at least one DC750V inverse module group and a boosting transformer. Electric energy feeding into a direct current touch net enters a direct current side of the DC750V inverse module by using a voltage transformer, the DC750V inverse module converts a direct current into a low-voltage alternating current, and the low-voltage alternating current is changed to a middle-voltage alternating current by passing through the boosting transformer and then is fed into a medium-voltage power network. The DC750V inverse module group comprises at least one DC750V inverse module, and an alternating current output end of the DC750V inverse module is connected to the boosting transformer. The apparatus can flexibly cover different current level requirements with a voltage of DC750 or 1500V, and can perform redundancy running and improve reliability.

A soft-switching bidirectional DC / DC conversion circuit and converter, including k parallel-connected buck-boost circuits, the two bridge arm switches in each buck-boost circuit are switched in turn to enter the conduction state, and during the switching process there is In the dead zone, the driving waveforms of k buck-boost circuits are interleaved in time by 1 / (k f s ), f s Represents the switching frequency of the buck-boost circuit, where the switching frequency f s According to real-time changes in real-time input voltage, real-time output voltage and real-time output power, the f s Make the circuit work in intermittent working mode, and the energy stored in the energy storage inductor can complete the charge and discharge of the parasitic capacitance in each bridge arm switch within the dead time, and maintain the diode during the freewheeling process in the dead time energy consumption. The invention has low conduction loss and switching loss, high efficiency, and can maintain high-efficiency operation in a wide range; material cost is reduced; current ripple is superimposed, and the ripple frequency is doubled while the peak and valley cancel each other, effectively reducing the high-voltage and low-voltage sides Filter volume; unitized design for easy expansion.

Disclosed in the invention is a subway energy feedback apparatus comprising a direct-current switch cabinet, a power cabinet, and a transformer. The power cabinet and the transformer are electrically connected with the direct-current switch cabinet. The power cabinet consists of a three-phase H-bridge inverter, alternating-current current transformers, an inverter side filter inductor, an alternating-current filter capacitor, second current hall sensors, and alternating-current circuit breakers. Input terminals of all phases of the three-phase H-bridge inverter are respectively connected with an output terminal of the direct-current switch cabinet; output terminals of all phases are respectively connected with input terminals of the respective alternating-current current transformer; and output terminals of all alternating-current current transformers are connected with corresponding filter input terminals; all filter output terminals are connected with corresponding current hall sensor input terminals; and the current hall sensor output terminals are connected with alternating-current circuit breakers output terminals. A direct current inputted into the power cabinet by the direct-current switch cabinet is processed by three-phase H-bridge single-polarity double-frequency inversion with the switching frequency of f; and then a three-phase pulse alternating current with an equivalent switching frequency of 2f is outputted. The pulse alternating current is processed by an LCL filter to obtain a three-phase sinusoidal low-voltage alternating current; and the low-voltage alternating current is processed by boosting by the transformer to obtain a medium-voltage sinusoidal alternating current that is then fed into a medium-voltage power grid. With the apparatus, the harmonic pollution can be effectively reduced; the reliability is high; the size is small; and the cost is low.

The invention relates to the technical field of photovoltaic grid-connected inverters. A photovoltaic inverter employing a hybrid type power device comprises two parts, namely, a power inversion unit and an inversion control unit, wherein the power inversion unit mainly comprises an input EMI (Electro-Magnetic Interference) filter circuit, an interleaving Boost boosted circuit, a full bridge inversion circuit employing a mixer and an output grid-connected filter circuit; the inversion control unit mainly comprises a power grid phase detection circuit, a sampling circuit and a controller. The photovoltaic inverter adopts a double-stage structure, and the first stage adopts interleaving Boost boosted voltage, so that the fluctuation of current is reduced, and output voltage ripple is reduced; the later stage inversion unit adopts a hybrid power device, so that the inversion consumption is effectively reduced, and the system efficiency is improved. The photovoltaic inverter has the characteristics of simple structure, easiness in circuit control and convenience in capacity expansion.

The invention discloses an AC and DC dual-purpose energy storage power regulating device and a control method thereof, including 3n cascaded H-bridge units, 3n energy storage units, an AC output interface circuit, a DC output interface circuit, and a central controller unit; The central controller unit controls the switching status of the AC circuit breaker of the AC output interface circuit and the DC circuit breaker of the DC output interface circuit, so that the energy storage device works in the energy storage inverter mode to connect to the AC grid, or works in the energy storage DC conversion mode The controller mode is used to connect to the DC grid; the central controller unit adopts the corresponding control strategy according to the working mode of the energy storage device to realize the two-way controllable flow of power. The invention can realize the flexible configuration and management of the energy storage system connected to the AC-DC hybrid microgrid by controlling the different working modes of the energy storage device, more efficiently utilize the conversion of electric energy between the AC and DC buses, and improve the efficiency of electric energy storage and transfer. Efficiency, easy to improve the stability of the AC-DC hybrid microgrid system.

The invention discloses a unidirectional DC voltage conversion device and system and a control method thereof. The unidirectional DC voltage conversion device is composed of a front-stage switch circuit, a rear-stage switch circuit, a front-stage circuit, a front-stage auxiliary isolating switch, a rear-stage auxiliary isolating switch, and a main power circuit. Among them, the power main circuit is composed of a fully controlled H-bridge circuit, a high-frequency transformer, a resonant element, an uncontrolled H-bridge circuit and input / output capacitors, and the upper and lower bridge arms of each half-bridge of the uncontrolled H-bridge circuit adopt composed of multiple diodes connected in series. Combining pre-stage, post-stage switching circuits and isolating switches. The unidirectional DC voltage conversion device can use multiple units for free series and parallel combination to form a system, which has a wider application range for the voltage and current requirements of the load. At the same time, combined with the series diode technology, it can greatly reduce the single The number of used DC voltage conversion devices reduces the system cost and improves the power density of the conversion device.

The present invention provides an open-loop charge pump circuit for increasing output voltage ripple frequency, comprising: overvoltage protection signal generation module, working clock generation module, boost control signal generation module, boost module, and output voltage ripple detection And the control module, wherein, the input end of the overvoltage protection signal generation module is connected with the output end of the boost module, and the output end is connected with the input end of the boost control signal generation module; the output end of the working clock generation module is connected with the boost control signal The input end of the generation module is connected; the output end of the boost control signal generation module is connected to the input end of the boost module; the input end of the output voltage ripple detection and control module is connected to the output end of the overvoltage protection signal generation module, and the output end Connected to the output terminal of the boost module, it adds an output voltage ripple detection and control module on the basis of the original open-loop charge pump circuit to solve the problem of sound quality degradation caused by the output voltage ripple frequency being too low.

Provided in the invention is a composite power factor correction circuit comprising a power circuit and a control circuit. The control circuit is connected with the power circuit and is used for generating M*N-path phase-shift drive pulse signals and inputting the signals into the power circuit. The power circuit includes a rectifier bridge, M boost inductors, and an electrolytic capacitor; the output terminal of each boost inductor is respectively with N power devices; a positive terminal of the electrolytic capacitor is connected with a common terminal of negative output terminals of M backward fast recovery diodes to form a second positive output terminal; and a negative terminal of the electrolytic capacitor is connected with an emitter common terminal of M*N power devices to form a second negative output terminal. Besides, the control circuit includes a voltage outer-loop controller, M current inner-loop controllers, and a carrier generator; and each of the current inner-loop controllers is connected with N phase-shift comparison drivers. According to the invention, the power level can be effectively improved; the boost inductor design is simplified; the model selection and installation of the power devices can be realized conveniently; and the total cost is lowered.

The invention discloses a three-phase three-level ANPC-DAB converter of a hybrid power device and a modulation method of the three-phase three-level ANPC-DAB converter, and belongs to the technical field of direct current-direct current converters. The driving modulation method suitable for the converter topology is provided by considering the particularity of the converter topology structure, current condition analysis in a time domain is effectively avoided, all switching loss is concentrated in a SiC MOSFET, the advantages of a SiC device are fully utilized, the switching loss of the converter is effectively reduced, and the conversion efficiency of the converter is improved. And the efficiency of the converter is improved. According to the method, a fundamental wave analysis method is adopted, an expression of the transmission power of the converter is obtained by means of a Fourier series expansion result, and a basis is provided for subsequent voltage and current modulation of the converter.

The invention discloses a circuit, which comprises a first bridge arm unit, a second bridge arm unit, a first capacitor and a second capacitor. Second ports for inductors of the first bridge arm unit and the second bridge arm unit are used for inputting cophase alternate current. Switch tubes of the first bridge arm unit and the second bridge arm unit are opened in a staggered manner to charge a first inductor and a second inductor, and the capacitance ripple waves are reduced. Under a working mode of a battery, the first bridge arm unit and the second bridge arm unit can still charge the inductors, and the circuit is not provided with idle devices, so as to improve the utilization ratio of the devices.

An RFID card reader transceiver device and system are disclosed. The reader chip is provided with a differential transmitting node TX1, a differential transmitting node TX2 and a receiving node RX. The receiving end of the receiving node RX is connected with a resistor RRX. The input end of the resistor RRX is connected with a capacitor CRX through a VComb terminal. N and the capacitor CRX_p, theoutput of the capacitor CRX_n and the capacitor CRX_p converge to the VComb terminal. A card reader chip in the transceiver system is provided with a transmitter and a receiver, The transmitter is connected with a differential power amplifier, the differential power amplifier is connected with a matching network unit, the matching network unit is connected with a carrier cancellation mixer and a radio frequency antenna, the carrier cancellation mixer is connected with a baseband filter, the baseband filter is connected with a receiver, and the baseband filter transmits the noise filtered datato the receiver. The invention reduces the carrier ripple interference, balances the output and the receiving load, and improves the sensitivity of the receiver.

The present invention specifically relates to a modular subway energy feedback device. In order to overcome the shortcomings of the prior art that cannot flexibly meet the needs of various power levels, the present invention adopts a modular subway energy feedback device based on a series and parallel structure. The device includes: at least one DC750V inverter module group and a step-up transformer; the electric energy fed into the DC catenary enters the DC side of the DC750V inverter module through a voltage transformer, and the DC power is converted into low-voltage alternating current through the DC750V inverter module, and the low-voltage alternating current The DC750V inverter module group includes at least one DC750V inverter module, and the AC output terminal of the DC750V inverter module is connected to the step-up transformer. The invention can flexibly cover the voltage of DC750 or 1500V and the requirements of different current levels, and can run redundantly and improve reliability.

An RFID card reader transceiver device and system, the card reader chip is provided with a differential transmission node TX1, a differential transmission node TX2 and a receiving node RX, and the receiving end of the receiving node RX is connected to a resistor R RX , resistor R RX input via V Comb Connected to the capacitor C RX‑n and capacitance C RX_p , capacitance C RX_n and capacitance C RX_p The outputs converge to V Comb end. The card reader chip in the transceiver system is equipped with a transmitter and a receiver. The transmitter is connected to a differential power amplifier. The differential power amplifier is connected to a matching network unit. The matching network unit is connected to a carrier cancellation mixer and a radio frequency antenna. Carrier cancellation mixing The receiver is connected with a baseband filter, and the baseband filter is connected with a receiver, and the baseband filter sends the data after noise filtering to the receiver. The invention reduces carrier ripple interference, balances output and receiving loads, and improves receiver sensitivity.

The present invention provides a multi-switch power factor correction method, system and electronic equipment. The multi-switch power factor correction method includes: receiving an input DC voltage signal from a power circuit, an output DC voltage signal, and a boosted current signal; The voltage signal, the output DC voltage signal, and the boosted current signal are logically processed to form multiple pulse width modulation driving signals; the i-th pulse width modulation driving signal and the i+1th pulse width modulation driving signal are phase-shifted by a preset angle , and the duty cycle is equally divided; i is greater than or equal to 1; the formed multi-channel pulse width modulation driving signal is input into the power circuit, so that it controls the on-off of the multi-level parallel power module to correct the power factor. The invention realizes unit power factor correction, doubles the ripple frequency of the inductance, is beneficial to the miniaturization design of the inductance, reduces the switching loss and conduction loss of the power device at the same time, and is beneficial to the type selection and heat dissipation treatment of the power device.