80 results about "Active rectification" patented technology

A power converter (100) for converting multi-phase AC grid input power (GIV, GIC) to DC output power. For allowing efficient, cost-effective, easy installable, and reliable power supply to a DC power consumer with high power requirements, it includes at least one phase block (106A, 106B), each having at least two separate converter single-phase string arrangements (1), each of them including an individual active rectifier portion (10), including a H-bridge with semiconductor switches (12), for rectifying single-phase AC input power (SInV, SInC) to intermediate DC power and an individual DC / DC converter (20). The latter includes an inverter portion (30), having a H-bridge with semiconductor switches (32), for inverting the intermediate DC power to first intermediate AC power (PAC1) with an elevated frequency (f1), a transformer (40, 240) for transforming the first intermediate AC power (PAC1) to second intermediate AC power (PAC2, PAC2A, PAC2B), and a passive diode rectifier (50, 150, 250), including a diode bridge (51), for rectifying the second intermediate AC power (PAC2, PAC2A, PAC2B). The disclosure further discloses a hydrogen production facility (200) with an electrolyzer stack (20) and such a power converter (100).

The invention discloses a dual-channel wireless energy supply system and a communication-free power control method thereof, and relates to the technical field of wireless power transmission, the system comprises a primary side transmitting end and a secondary side receiving end, the primary side transmitting end and the secondary side receiving end jointly construct a fundamental wave main power channel CH1 and a third harmonic channel CH2, energy and signal coupling transmission is realized between the primary side transmitting end and the secondary side receiving end through a dual-channel magnetic coupling structure. According to the method, the phase of third harmonic current is adjusted through an active rectification circuit of a secondary side receiving end, the load state is transmitted to a primary side transmitting end in a phase deviation mode, and after the primary side transmitting end detects phase information, the duty ratio of a full-bridge inverter is adjusted through a closed loop, and self-adaptive control over the output power of the system is achieved. According to the invention, non-communication transmission of a load state is completed by using a harmonic channel, closed-loop adjustment is carried out and the power range of the ZVS is expanded in combination with phase information, and stable and efficient wireless power transmission control is realized.

The invention relates to the technical field of generator control, and discloses an intelligent vehicle-mounted high-power self-generating control method and system. The method comprises the following steps: acquiring operating parameters of a generator set, performing high-precision digital processing, realizing constant-rotating-speed control through cooperation of multiple controllers based on a rotating-speed fluctuation characteristic value, performing power factor correction through coordinate transformation and active rectification to obtain a direct-current bus voltage, performing precise voltage stabilization by adopting a multi-phase interleaving converter, and outputting the direct-current bus voltage. And finally, outputting a high-quality three-phase alternating-current power supply through space vector modulation and closed-loop feedback control. The technical problems in the prior art that the power supply quality control capability is insufficient, the intelligent level is low, the environmental adaptability is poor, the load adaptability is limited, and the maneuverability is limited are solved.

An electric machine for a motor vehicle is disclosed, and may include a stator, a rotor rotatably mounted with respect to the stator and having rotor windings for generating a rotor magnetic field, and an active rectifier provided on the rotor. The active rectifier may electrically connect a voltage source present on the rotor to the rotor windings, and may be configured to convert an alternating voltage provided by the voltage source into a direct voltage. The direct voltage may be configured to be utilized during generation of the rotor magnetic field by the rotor windings. The active rectifier may be arranged on or in a cooling section of the rotor. The cooling section may form a heat sink through which a cooling fluid can flow.

A medical imaging system includes an X-ray source configured to emit X-rays. The medical imaging system also includes a high voltage generator configured to provide power to the X-ray source. The medical imaging system further includes a high efficiency power distribution unit configured to receive electrical power from an electrical grid and to store the electrical power, wherein the high efficiency power distribution unit includes an active rectifier configured to regulate a high voltage direct current outputted to components of the medical imaging system including the high voltage generator.

In a galvanically connected power converter, for example in a drive unit or a charging device, an H-bridge DC / DC converter is arranged in parallel with the DC link and, in this H-bridge DC / DC converter, the temporal components for the two OFF states of the DC / DC converter are determined in such a way that the DC / DC converter generates common-mode voltages which at least partially compensate for the common-mode voltages in the power converter.

The invention relates to the technical field of welding equipment manufacturing, and provides a lithium electric welding machine integrated with a power factor correction and active rectification structure. The welding machine comprises a main control chip, a lithium battery power supply module, a welding power control module, a charging management module, a voltage safety control module, a multi-stage isolation sampling module, an asymmetric half-bridge power supply module and a man-machine interaction module. The welding power control module adopts double MOS tube complementary driving to realize active rectification, and the chopping unit adjusts welding current through pulse width modulation. The charging management module is integrated with a power factor correction unit and works in linkage with the welding power control module, and the bus voltage stability is optimized. The voltage safety control module dynamically switches welding machine terminal voltage to a safety threshold value, the multi-stage isolation sampling module achieves battery voltage isolation sampling, and the man-machine interaction module provides a parameter digital setting and displaying function.

The invention relates to a method for de-exciting a rotor winding of a rotor of an electric machine (2) of a motor vehicle (1), the electric machine comprising a stator and a rotor mounted rotatably relative to the stator, the rotor having a rotor winding for generating a rotor magnetic field, an active rectifier being arranged on the rotor side, the rectifier comprises at least one field effect transistor which can be actuated by means of an actuation voltage, the rectifier electrically connects a voltage source present on the rotor side to the rotor winding, by means of which an alternating voltage provided by the voltage source can be converted into a direct voltage, the field effect transistor or at least one of the field effect transistors is brought into an operating state, in which the respective field effect transistor forms an ohmic resistance, by means of a control voltage, and the energy stored in the rotor winding causes a current to flow through the at least one field effect transistor forming the ohmic resistance, at least a portion of the energy is converted into thermal energy.

A power generating system comprising an electrical generating set and a modulator configured to maintain optimal voltage regulation under varying load conditions. The system includes a controllable current power source; an active rectifier coupled to the controllable current power source, configured to rectify an output of the controllable current power source to supply utility-grade power or for recharge of a battery or batteries. A controller is configured to adjust at least one of the parameters of the controllable current power source and / or supply from the generator and a parameter of the active rectifier in response to a target output.

A stator defines multiple stator poles with associated stator windings. A rotor defines multiple rotor poles with associated rotor windings configured to be energized substantially by the stator. The rotor defines a rotor field energizable by magnetic fields produced by the stator windings to produce relative force between the rotor and the stator. An active rectifier is conductively coupled to one or more first rotor windings. The active rectifier is configured to control a direction of current flow through the one or more first rotor windings responsive to a signal received wirelessly from the stator by one or more second rotor windings.

The application discloses a phase-locked method and system for active rectification of a wireless power transmission system, through analog-to-digital conversion of a first component and a second component, the post-stage calculation is facilitated; a first compensated value and a second compensated value are obtained, so that a phase difference between a rectifier input voltage fundamental component and an input current fundamental component is obtained, a phase difference value is obtained according to a phase value obtained through feedback and a phase reference value instruction, the phase difference is input into a compensation controller of a controller to output a carrier comparison value, a driving signal of a power tube in the rectifier is obtained according to the carrier comparison value and a triangular carrier, and the phase-locked active rectification is realized. The phase difference is input into the compensation controller of the controller to output the carrier comparison value, so that the detection precision of the system on the phase between the rectifier input voltage and the rectifier input current can be improved; the phase-locked method does not depend on resonant current zero-crossing detection, and the instability problem caused by resonant current zero-crossing detection in the traditional synchronization method is avoided.

A power supply device comprises an input port, an active rectification circuit, a surge bleeder circuit, a detection circuit, a rectification control circuit, a protection control circuit and a drive circuit. The surge bleeder circuit is coupled between the input port and the active rectification circuit. The detection circuit outputs an output signal which is a normal signal in a normal state to the protection control circuit, and changes the output signal into an actuating signal in response to detecting a surge signal output by the surge bleeder circuit. The protection control circuit outputs a control signal as an operation signal in response to receiving a conventional signal, so that the driving circuit outputs a driving signal to the active rectification circuit according to the operation signal. The protection control circuit transiently interrupts the output of the control signal as the operation signal in response to receiving the actuation signal such that the drive circuit does not output the drive signal.

The invention discloses a wireless energy transmission and data communication system. An alternating current input end comprises a resonance network; the switch module is connected to the two ends of the resonant capacitor and is used for switching a zero-voltage output mode or an active rectification mode of the wireless energy transmission system by switching on or off the resonant capacitor; the active rectification module comprises a power tube and a voltage comparison module, and the voltage comparison module controls the on-off of the power tube by comparing the voltage of the AC input end with a preset threshold value; the control module comprises a pulse width modulation feedback loop, and the feedback loop dynamically adjusts the duty ratio of the switch module according to the output voltage of the load end; the data modulation module comprises a dual-mode ramp generation unit and a demodulation unit, the dual-mode ramp generation unit realizes load keying modulation of uplink data by adjusting phase switching of ramp signals, and the demodulation unit recovers modulation data by detecting energy signal changes; the output voltage is kept stable in a full-load range; and the peak efficiency is greatly improved compared with a traditional scheme.

The invention relates to a circuit arrangement (21) for correcting an input signal (S2), wherein the input signal (S2) at an input interface (15) of the circuit arrangement (21) comprises a useful signal (S1) with a useful frequency and an interference signal with an interference frequency, wherein the circuit arrangement (21) comprises: a high-pass filter (1) with a cutoff frequency, an inverting operational amplifier circuit (2) connected downstream of the high-pass filter (1) and connected in series with the high-pass filter (1), an active rectifier circuit (3) connected downstream of the inverting operational amplifier circuit (2) and connected in series with it, having two parallel-connected conduction paths, each conduction path comprising a rectifying element (3a, 3b), and a summing amplifier circuit (5) connected downstream of the rectifier circuit (3),wherein the summing amplifier circuit has an inverting input and a non-inverting input, and each conduction path is electrically connected to one of the inputs of the summing amplifier circuit (5). This provides a simple and compact circuit arrangement with which interference signals can be effectively suppressed.

The invention discloses a soft start control method for low impact current of a three-phase grid-connected power electronic converter, and belongs to the technical field of power electronics. The method is used for realizing smooth switching of the three-phase grid-connected power electronic converter from a passive rectification state to an active rectification state. When the three-phase grid-connected power electronic converter needs to be switched from a passive rectification state to an active rectification state, the transition process of switching from the passive rectification state to the active rectification state is divided into a plurality of control periods which are equal in length and continuous; each control period is composed of a passive rectification state time period and an active rectification state time period, the duty ratio of the active rectification state time period in each control period is dynamically regulated and controlled through a state duty ratio modulation algorithm, when the duty ratio of the active rectification state time period in the control period is 1, soft start is ended, and when the duty ratio of the active rectification state time period in the control period is 1, soft start is stopped. And smooth switching of the three-phase grid-connected power electronic converter from a passive rectification state to an active rectification state is realized. According to the invention, the grid-connected reliability and the equipment safety margin can be improved.

This invention discloses a multi-level interleaved parallel Buck active rectifier magnetically coupled wireless power transfer system, with input power V in With the transmitter-side inverter S p1 -S p4 The input port is connected to the transmitter-side inverter S. p1 -S p4 The midpoints of the two bridge arms are connected to the input terminal of the transmitter-side compensation circuit, and the output terminal of the transmitter-side compensation circuit is connected to the transmitter coil L. p Connection, transmitting coil L p and receiving coil L s There is magnetic coupling between them, and the receiving coil L s The circuit is connected to the input of the receiving-side compensation circuit. One end of the output of the receiving-side compensation coil is connected to the AC port of the receiving-side multi-level interleaved parallel Buck active rectifier, and the DC side of the rectifier is connected to the load. This invention integrates multi-level and variable-level active rectifier technologies on the basis of an active rectifier, combining the interleaved parallel Buck topology with the switched capacitor topology. This achieves full-range impedance matching under low switching device voltage stress, while the interleaved parallel connection reduces output current ripple.

A circuit arrangement for correcting an input signal that includes a useful signal with a useful frequency and an interference signal with an interference frequency comprises: a high-pass filter with a cut-off frequency; an inverting operational amplifier circuit connected downstream from the high-pass filter and connected in series with the high-pass filter; an active rectifier circuit connected downstream from the inverting operational amplifier circuit and connected in series thereto, with two parallel-connected line paths, wherein each line path comprises a rectifying element; and a summing amplifier circuit connected downstream from the rectifier circuit, wherein the summing amplifier circuit has an inverting input and a non-inverting input and each line path is electrically connected to one of the inputs of the summing amplifier circuit. This provides a simple and compact circuit arrangement with which interference signals can be effectively suppressed.

An electric machine (2) for a motor vehicle (1), comprising a stator (4) and a rotor (3) rotatably mounted with respect to the stator (4), with rotor windings (15) for generating a rotor magnetic field, wherein an active rectifier (19) is provided on the side of the rotor (3), which electrically connects a voltage source on the side of the rotor (3) to the rotor windings (15) and by means of which an alternating voltage provided by the voltage source can be converted into a direct voltage which can be used in the course of generating the rotor magnetic field by the rotor windings (15), wherein the rectifier (19) comprises several controllable semiconductor devices (35) and is arranged on or in a cooling section (27) of the rotor (3) which forms a heat sink and through which a cooling fluid can flow.

A power generation system includes a generator configured to output alternating current (AC) power, an active rectifier configured to receive the AC power from the generator, convert the AC power to direct current (DC) power, and output the DC power. A current injector is connected to the active rectifier and is configured to provide an injection current to power flowing through the active rectifier. The injection current includes a reactive component.

The invention provides an MC-WPT system with partial power control and a power adjusting and efficiency improving method thereof. A primary side of the system is provided with a primary side direct-current power supply, N primary side full-bridge inverters, N primary side compensation networks, a primary side capacitor and a primary side coil; the secondary side is provided with a secondary side coil, a secondary side capacitor, a secondary side first compensation network, a secondary side second compensation network, a secondary side passive rectifier, a secondary side active rectifier and a rechargeable power supply; according to the invention, a primary and secondary side cooperative control strategy of power level matching-redundant module cut-out-external shift phase angle resetting is adopted, the matching of the system power and the improvement of the efficiency are realized, the number of primary side modules is determined according to the power level requirement, and then the external shift phase angle is regulated and controlled by controlling the impedance angle of the secondary side modules, so that the power level of the system is improved. Therefore, the offset of the system power is realized, and the power adjusting range is obviously widened. The system can adapt to various application scenes such as vehicle-mounted wireless charging and industrial equipment power supply, and has remarkable engineering practical value.

The active rectification circuit, the control method thereof and the isolated power supply, the active rectification circuit comprising an active rectification module, a sampling processing module, a delay control module and a drive control module; the first input end of the sampling processing module is connected with the first end of the secondary coil of the transformer, the second input end of the sampling processing module is connected with the second end of the secondary coil of the transformer, the first output end of the sampling processing module outputs a first frequency signal, the second output end outputs a second frequency signal, and the third output end outputs a third frequency signal; the delay control module is used for determining the delay time of the second frequency signal according to the first frequency signal and the third frequency signal, and outputting a delay processing signal from the output end thereof; the output end of the drive control module is connected with the control end of the active rectification module, and the drive control module is used for outputting a drive control signal according to the delay processing signal and the second frequency signal. The scheme takes into account EMI radiation and rectification efficiency.

The invention discloses a synchronous rectification control circuit of an LLC resonant converter, and belongs to the technical field of synchronous rectification. In the synchronous rectification control circuit, the input end of a half-cycle detection module is electrically connected with an auxiliary winding of an LLC main circuit transformer; a first input end of the active rectification module is electrically connected with an auxiliary winding of an LLC main circuit transformer, and a second input end and a third input end of the active rectification module are electrically connected with the half-cycle detection module; a first input end and a second input end of the inflection point detection module are electrically connected with the half-cycle detection module, and a third input end of the inflection point detection module is electrically connected with the active rectification module; the turn-off signal prediction module is electrically connected with the inflection point detection module; the first input end of the synchronous signal generation module is electrically connected with the turn-off signal prediction module, the second input end is electrically connected with the first synchronous rectifier tube, the third input end is electrically connected with the second synchronous rectifier tube, the first output end is electrically connected with the first synchronous rectifier tube, and the second output end is electrically connected with the second synchronous rectifier tube.

The present invention discloses a dual-channel wireless energy supply system and a communication-free power control method thereof, which relates to the field of wireless power transmission technology. The system includes a primary transmitting end and a secondary receiving end. The primary transmitting end and the secondary receiving end jointly construct a fundamental main power channel CH1 and a third harmonic channel CH2. The primary transmitting end and the secondary receiving end realize the coupled transmission of energy and signal through a dual-channel magnetic coupling structure. The method of the present invention adjusts the phase of the third harmonic current through the active rectification circuit of the secondary receiving end, and transmits the load state to the primary transmitting end in the form of a phase offset. After the primary transmitting end detects the phase information, it adjusts the duty cycle of the full-bridge inverter through a closed loop to realize adaptive control of the system output power. The present invention uses the harmonic channel to complete the communication-free transmission of the load state, and combines the phase information to perform closed-loop regulation and expand the power range of ZVS to achieve stable and efficient wireless power transmission control.

A converter device is provided. The converter device includes a filter circuit, a DC link and an active rectifier interconnected between the filter circuit and the DC link. A method for determining at least one parameter (b) of the filter circuit is also provided. The method includes switching the active rectifier into an active state, where a first active rectifier leg connects a first phase of the filter circuit with a positive side of the DC link and a second active rectifier leg connects a second phase of the filter circuit with a negative side of the DC link; determining a time series (y) of current values by measuring a current through the filter circuit; and determining the at least one parameter (b) of the filter circuit by calculating a best fit of the at least one parameter (b) from a difference equation of the filter circuit.

The present invention relates to an integrated system of a wireless charging system and an auxiliary power supply system for electric vehicles. The system comprises a ground-side system and a vehicle-side system. The ground-side system includes a rectifier, a high-frequency inverter, a ground-side compensation network, and a transmitting coil. The vehicle-side system includes a receiving coil, a vehicle-side compensation network, a first active rectifier, a high-voltage battery, a transformer, a second active rectifier, and a low-voltage battery. The rectifier is connected to the power grid, which is then connected to the transmitting coil via a high-frequency inverter and the ground-side compensation network. The transmitting coil and the receiving coil are coupled via a magnetic field to transfer energy. The receiving coil is connected to the vehicle-side compensation network, which is also connected to the first active rectifier and the transformer. The first active rectifier is connected to the high-voltage battery, and the transformer is connected to the low-voltage battery via the second active rectifier. This integrated system has a simple structure, occupies a small vehicle volume, and improves power density.

The invention provides a receiver. The receiver includes an antenna exposed to a magnetic field having a carrier frequency in a radio frequency region; and a rectification stage of the receiver integrated circuit configured to extract an internal supply voltage for processing data with the receiver integrated circuit of the receiver. The antenna is configured to receive an antenna signal and is connected to a tuning circuit configured to provide a first receive signal at a first input pin of the rectification stage and a second receive signal at a second input pin of the rectification stage. The rectification stage includes a first switch, an on stage, a second switch, and an off stage.

The utility model relates to a common direct current bus topology circuit which comprises an LCL filtering module, an active rectification module, a current transformation module and a common direct current bus. The input end of the LCL filtering module is used for being connected with an alternating current power supply input port, and the output end of the LCL filtering module is connected with the input end of the active rectification module; the output end of the active rectifier module is connected with the input end of the converter module through the common direct current bus, and the output end of the converter module is used for being connected with external target equipment; compared with the prior art, the technical scheme of the utility model can effectively suppress the harmonic component in the DC bus, and ensures the safe and stable operation of the frequency conversion system.

The application discloses a wireless energy supply receiving circuit and relates to the technical field of integrated circuits, which comprises an active rectifier, two adaptive voltage feedback circuits and two hybrid gate control circuits, wherein the input end of the active rectifier is connected with two ends of a receiving coil on a body chip; the active rectifier comprises a pair of cross-coupled PMOS power tubes and NMOS power tubes NM1 and NM2; the input end of each adaptive voltage feedback circuit is connected with the gate of the NMOS power tube NM1 or NM2; and each hybrid gate control circuit comprises a common-gate comparator, a rising edge detection circuit, a voltage-controlled delay circuit, a first SR latch and a driving circuit. The application is a complete implant, does not need an additional battery for power supply, greatly saves the volume of the implant, and brings smaller physical burden to a patient.

The invention discloses a wired and wireless multiplexing charging method and charging system for an electric vehicle, and belongs to the technical field of electric vehicle charging. In order to solve the problems that a charging facility is single in function, low in resource utilization rate, complex in system structure, limited in power density and service life and incapable of flexibly switching a wired charging mode and a wireless charging mode in the same equipment, the method comprises the following steps: a wired charging mode: a vehicle-mounted power battery is directly connected to an active rectifier bridge of a multiplex charging system through a charging gun; the AC-AC converter and the active rectifier bridge are uniformly controlled, and the switching frequency is higher than the resonant frequency of the planar magnetic coupling resonant network, so that charging power adjustment is realized; and in a wireless charging mode, the resonant frequency of the planar magnetic coupling resonant network is set to be the same as the switching frequency, the AC-AC converter is controlled to generate high-frequency inverter voltage, the planar magnetic coupling resonant network is excited, and wireless power transmission is realized through electromagnetic coupling between the planar magnetic coupling resonant network and the receiving coil. The method is used for electric vehicle energy supplement.

Methods and systems are provided for an active rectifier comprising an alternating current (AC) portion on one side of the active rectifier, a direct current (DC) portion on another side of the active rectifier, an insulated gate bipolar transistor (IGBT) portion positioned between the AC portion and the DC portion, and a heat sink positioned below the IGBT portion and between the AC portion and DC portion, the heat sink electrically coupling the AC portion and the DC portion to achieve a reduced inductive path between the AC portion and the DC portion.