53 results about "Active rectification" patented technology

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.

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 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.

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.

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 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 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.

The embodiment of the invention discloses an active rectification circuit, a control method thereof and an isolation power supply. The active rectification circuit comprises an active rectification module, a sampling processing module, a delay control module and a driving control module. A first input end of the sampling processing module is connected with a first end of a transformer secondary coil, a second input end of the sampling processing module is connected with a second end of the transformer secondary coil, a first output end of the sampling processing module outputs a first frequency signal, a second output end outputs a second frequency signal, and a 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 of the delay control module; and the output end of the driving control module is connected with the control end of the active rectification module, and the driving control module is used for outputting a driving control signal according to the delay processing signal and the second frequency signal. According to the scheme, EMI radiation and rectification efficiency are both considered.

The invention relates to an efficient power distribution unit for a medical imaging system. 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 an efficient power distribution unit configured to receive power from a power grid and store the power, where the efficient power distribution unit includes an active rectifier configured to regulate a high voltage direct current output to a component of the medical imaging system including the high voltage generator.

The invention relates to the technical field of magnetic coupling wireless power transmission, and particularly discloses a constant output and optimal efficiency tracking method and system of a variable-parameter MC-WPT system, and the method comprises the steps: determining a cooperative control strategy of a primary inverter and a secondary active rectifier through deducing the optimal efficiency implementation condition of the variable-parameter MC-WPT system, and carrying out the tracking of the constant output and optimal efficiency of the variable-parameter MC-WPT system. According to the method, secondary side tuning and optimal load impedance matching are achieved through active rectifier conduction angle control and full-bridge inverter frequency adjustment so as to track the optimal transmission efficiency of the system, and constant output power is achieved through full-bridge inverter phase shift control. Meanwhile, by optimizing a primary side compensation parameter and a secondary side active rectification control strategy, it is ensured that the inverter and the active rectifier are always in a ZVS running state.

The invention discloses an alternating current-direct current converter which performs preliminary voltage division on input voltage through a first voltage division capacitor and a second voltage division capacitor, and controls opening and closing of a first bus switch and a second bus switch according to the input voltage through a logic control module. The logic control module controls the connection state of the switched capacitor array according to the input voltage, the input voltage is converted into direct-current voltage through the rectifier, and the direct-current voltage is output through the output capacitor. According to the invention, by introducing the active rectifier and adopting a dynamic capacitance distribution architecture, uniform distribution of rectifier conduction time in a full period is realized, the conversion efficiency of converting AC commercial power input into low-voltage DC output is improved, and output ripples can be reduced while stable operation under various commercial power standards can be realized.

An integrated multi-port generator-rectifier device includes multiple passive output ports provided from a plurality of passive-rectifier windings on a common, single magnetic structure. The passive-rectifier windings interact with a plurality of magnetic poles. Coils in the passive rectifier windings are serially connected. Each of the passive rectifier windings has a pitch as that is a fraction of magnet pole pitch and a pattern to magnetically decouple back emf phases of the separate rectifiers. The device further includes an active port provided by an active rectifier.

The invention relates to a rectifier adaptive damping adjustment method and device, equipment, a storage medium and a product. Comprising the following steps: when a diesel generator is used as a main power supply of a direct-current micro-grid, superposing a preset disturbance signal in a modulation wave of a rectifier, and obtaining the voltage of the diesel generator and the output current of the rectifier in a disturbance period; the filter is connected with the rectifier and the diesel generator; determining a real-time impedance ratio of the diesel generator according to the voltage of the diesel generator and the output current of the rectifier; determining a dynamic damping coefficient according to the real-time impedance ratio and the voltage of the diesel generator; according to the dynamic damping coefficient and the voltage of the diesel generator, a damping component instruction value of current inner ring superposition is determined; and generating a pulse width modulation signal according to the capacitor voltage of the direct current bus, the rectifier output current and the damping component instruction value, and sending the pulse width modulation signal to the rectifier. By adopting the method, the influence of diesel generator electromagnetic characteristics on the active rectification converter can be inhibited.

The invention discloses an energy management method for a hydroelectric generating set magnetic field energy taking device. The energy management method comprises the following steps of S1, offsetting inductive impedance of an energy taking coil by adopting a series resonance matching method; s2, low-loss rectification is realized through a quadruple-voltage active rectification method, and the output voltage is increased; and S3, optimizing energy management based on an RC tracking type maximum power tracking method, converting alternating current obtained by a hydroelectric generating set magnetic field energy obtaining device into direct current capable of being used by a sensor, and meanwhile, meeting the requirements of low power consumption and output stability. According to the invention, a series resonance matching, quadruple voltage active rectification and RC tracking type MPPT three-level collaborative architecture is constructed, the problem of mismatching of inductive impedance of an energy taking coil under a low-frequency magnetic field is solved by accurately designing series resonance parameters, and low loss and stable boosting of quadruple voltage rectification are realized by adopting a low-threshold device and a self-starting mechanism. The maximum power point is accurately locked with ultra-low power consumption based on an RC tracking strategy of an analog circuit, efficiency and stability bottlenecks of non-intrusive energy taking under the low-frequency strong magnetic field environment of the hydroelectric generating set are broken through in cooperation of the three, and efficient conversion from weak magnetic field energy to available direct current of a sensor is achieved.

An active rectifier circuit for providing a rectified voltage output to a point of regulation that is located downstream of the active rectifier circuit. The active rectifier circuit includes rectifying circuitry and control circuitry operable to control the rectifying circuitry based on voltage feedback to provide a certain voltage output at the point of regulation. The control circuitry is configured to obtain voltage feedback from a first point associated with the point of regulation and to obtain parallel voltage feedback from a second, different point, and to control the rectifying circuitry based on both the voltage feedback from the first point and the voltage feedback from the second point.

The invention relates to the technical field of magnetic coupling wireless power transmission (MC-WPT), in particular to an MC-WPT system active rectification soft slow start method and system based on frequency conversion control, a full-bridge active rectifier bridge composed of MOSFETs is adopted at the receiving end of an MC-WPT system, and the current i1, i2, i3, i4, i5, i6, i7, i8, i8, i8 and i8 of a front-end bridge port are detected in real time through an analog circuit (current acquisition circuit); and judging the relation among the current i1, the bridge port current i1last at the previous moment, a current threshold value delta and 0, if i1 is less than 0, i1last is greater than-delta and i1 is less than or equal to-delta, starting to run the first half cycle, otherwise, judging that i1 is less than 0, i1last is greater than-delta and i1 is less than or equal to-delta, and if i1 is less than 0, i1last is greater than-delta and i1 is less than or equal to-delta, running the second half cycle. And circularly moving the first half cycle and the second half cycle until the receiving end of the system reaches a steady state. Thus, the switching frequency of the full-bridge active rectifier bridge is dynamically adjusted, zero-voltage switching of the rectifier bridge in the whole starting process is achieved, additional inductance and capacitance are not needed, starting impact is reduced, EMI is restrained, and the reliability and efficiency of a system are improved.

The invention relates to the technical field of oil exploitation, in particular to a super capacitor bank energy storage type motor speed regulation workover rig. Comprising a motor speed regulation system which comprises an inversion unit and a variable-frequency and variable-speed motor electrically connected with the inversion unit; the input end of the three-phase active rectification unit is connected with the commercial power grid, and the output end is connected with the DC bus; the bidirectional DC-DC converter is respectively connected with the DC bus and the super capacitor module; according to the super capacitor module, the temperature rise of each super capacitor monomer under the maximum discharge current does not exceed 40 DEG C, and the cycle life is not less than 100000 times under the condition of 1C; the sampling period Ts of the controller is smaller than or equal to 10ms, and the controller is used for collecting parameters and outputting control signals according to the parameters. According to the invention, the power supply side adopts the super capacitor for power compensation and is equipped with the quick-response bidirectional power electronics and controller, so that'peak load shifting 'is realized, the operation continuity is improved, the dependence on the transformation of a well site transformer is reduced, the regenerated energy of the put-down operation is recovered, the brake wear is reduced, and the energy utilization efficiency is improved.

A power supply device includes an input port, an active-rectifier circuit, a surge-discharge circuit, a detection circuit, a rectification-control circuit, a protection-control circuit, and a drive circuit. The surge-discharge circuit is coupled between the input port and the active-rectifier circuit. The detection circuit outputs an output signal, normally a regular signal, to the protection-control circuit and, in response to detecting a surge signal from the surge-discharge circuit, changes the output signal to an activation signal. The protection-control circuit, in response to receiving the regular signal, outputs the control signal as an operation signal. The drive circuit then outputs a drive signal to the active-rectifier circuit according to the operation signal. The protection-control circuit, in response to receiving an activation signal, temporarily interrupts outputting the control signal as the operation signal. The drive circuit then stops outputting the drive signal.