96 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 three-phase hybrid rectifier model predictive current control method based on a variable exponential sliding mode. An inner ring active rectifier adopts a rapid optimal three-vector model predictive controller; the inner ring passive rectifier adopts a three-order extended state observer-model prediction controller; and a voltage outer loop adopts variable exponential reaching law sliding mode control. According to the method, the variable exponential reaching law sliding mode control can effectively restrain violent buffeting caused by large gain. The fast optimal three-vector model predictive controller can determine the optimal vector combination through only two times of optimization, so that the calculation complexity is greatly reduced. According to the input voltage observation method based on the third-order extended state observer, the number of used sensors is reduced, and meanwhile the input current quality is improved. The research of the method has important significance for improving the reliability of the industrial equipment power supply.

The invention discloses a wireless electric energy transmission system based on a semi-active rectifier, which comprises an input power supply Vin, a transmitting side inverter unit, a transmitting side compensation circuit, a transmitting coil Lp, a receiving coil Ls, a receiving side compensation circuit, a receiving side semi-active rectifier and a load RL, one active bridge arm of the full-bridge active rectifier is replaced by a passive bridge arm which is composed of two diodes and does not need to be controlled, soft switching of all switching tubes on the receiving side is guaranteed while rectifier control is simplified, and a secondary side resonance current zero crossing point sampling circuit is simplified by utilizing the passive rectification characteristic of the passive bridge arm. The designed output voltage control and secondary side resonance current zero crossing point detection circuit is simple, convenient to control and easy to implement, and has a good application prospect.

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.

Aircraft electric machines are described. The aircraft electric machines include a laminated rotor operably connected to a shaft, the laminated rotor comprising a plurality of rotor teeth and air gaps defined between adjacent rotor teeth about a circumference of the laminated rotor, a modular stator assembly comprising at least one stator segment having a winding wrapped about a center body of the at least one stator segment, a cooling element arranged at least one of adjacent to or within the winding, and at least one power module system comprising an active rectifier and wherein the laminated rotor and modular stator are arranged as a switched reluctance rotor-stator assembly.

The invention provides a wireless electric energy transmission system suitable for an industrial environment, and solves the limitation of an industrial sensor in traditional wired charging and complex industrial environments. According to the system, constant voltage output and maximum efficiency tracking (MET) control are realized under the conditions of load change and coupling coefficient fluctuation by accurately adjusting the duty ratio D of a DC-DC converter at a transmitting end and the phase shift angle alpha of a semi-active rectifier (SAR) at a receiving end. The optimized control strategy enables the system to stably operate in a dynamic environment, ensures efficient and stable charging, and reduces the risks of wired interface damage and unstable charging. Compared with traditional wired charging, the wireless charging device overcomes the adaptability problem in severe environments such as high temperature, high humidity, high vibration and narrow space, avoids complex cable layout and maintenance cost, is widely applied to the fields of industrial sensors, power equipment and the like, is particularly suitable for scenes needing efficient wireless charging and constant voltage output, and has wide application prospects. The equipment operation stability and the production efficiency are improved.

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.

The invention relates to an arrangement (200) for supplying a load (150) with alternating voltage from a power supply source (130), wherein the arrangement comprises several active rectifiers (110, 120) connected in parallel and one or more transformers (160), wherein the several active rectifiers have DC-side connections (114, 124) for electrical connection to the load, wherein the several active rectifiers are electrically connectable to or are connected to the one or more transformers (160) on the AC-side, wherein separate secondary windings of the one or more transformers are assigned to different several active rectifiers, and wherein the one or more transformers have connections (166) for electrical connection to the power supply source (130). The invention also relates to a method and a system therefor.

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.

The invention relates to the technical field of wireless charging, in particular to an active rectification synchronizing signal generating circuit, a receiver and a wireless charging system.The active rectification synchronizing signal generating circuit generates a phase synchronizing signal needed by an active rectification circuit in the receiver of the wireless charging system based on the output current of a resonance circuit, and outputs the phase synchronizing signal to the receiver. Comprising a high-frequency current sensor circuit for measuring the output current of a resonance circuit and converting the output current into a corresponding voltage signal; the resonant filter circuit is used for filtering the voltage signal to obtain a processing result; and the high-frequency zero-crossing comparator circuit is used for generating a phase synchronizing signal according to a processing result. According to the invention, an accurate phase synchronization signal can be provided for the active rectification circuit of the wireless charging receiver so as to realize synchronous rectification and phase shift control, the oscillation problem of the active rectification circuit of the wireless charging receiver can be obviously improved in the implementation process, and the phase shift range and the load range of the active rectification circuit are effectively improved.

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.

The invention provides a wireless power transmission charging system with constant power output and a control method. The method comprises the following steps: acquiring a mutual inductance parameter between a primary side self-inductance coil and a secondary side self-inductance coil in the charging system and an initial angle of an active rectifier in an active rectifier circuit; when the charging system meets the resonance condition, determining the output power of the charging system; and determining the phase shift angle of the active rectifier based on the mutual inductance parameter, the output power, the input voltage, the load resistance and the compensation inductance of the charging system. According to the method provided by the invention, dynamic balance of the charging system is realized by adjusting the phase shift angle of the active rectifier at the secondary side after the phase shift angle of the active rectifier is determined, control parts are all at the secondary side, and compared with the prior art, two-end communication is not needed. And the dynamic performance of the method provided by the invention is excellent by adjusting the phase shift angle of the secondary side active rectifier.

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 discloses a wireless power transmission system based on a semi-active rectifier, comprising an input power supply V in , transmitting side inverter unit, transmitting side compensation circuit, transmitting coil L p , receiving coil L s , receiving side compensation circuit, receiving side semi-active rectifier and load R L The present invention replaces an active bridge arm of the full-bridge active rectifier with a passive bridge arm composed of two diodes that does not require control. This method simplifies the rectifier control while ensuring the soft switching of all switch tubes on the receiving side, and uses the passive rectification characteristics of the passive bridge arm to simplify the secondary side resonant current zero-crossing sampling circuit. The designed output voltage control and secondary side resonant current zero-crossing detection circuit has a simple circuit, is convenient to control, is easy to implement, and has good application prospects.

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.