32 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.

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 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.

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 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.

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.

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.

A full-wave active rectifier system, comprising: a full-wave active rectifier for generating a DC voltage output signal based on an AC voltage input signal. The full-wave active rectifier comprising first and second transistors which are controllable by a controller, and, third and fourth transistors which are controlled by the AC voltage input signal. The full-wave active rectifier system comprising: the controller coupled to the first transistor. The full-wave active rectifier system is configured to: when the first transistor is in an off-state, monitor a first voltage at a node shared by the AC voltage input signal and a first terminal of the first transistor; and sense a voltage transient in the first voltage caused by switching the first transistor between an on-state and the off-state. The controller is configured to: control, in response to sensing the voltage transient, a phase-angle at which the first transistor switches between the on-state and the off-state.

A method for de-exciting rotor windings of a rotor of an electric machine for a motor vehicle, wherein the electric machine includes a stator and the rotor rotatably mounted with respect to the stator, wherein an active rectifier including at least one field effect transistor controllable by way of a control voltage is provided, wherein the active rectifier electrically connects a voltage source present on a part of the rotor to the rotor windings, wherein the at least one field effect transistor is brought into an operating state that de-excites the rotor windings by way of the control voltage, in which the at least one field effect transistor forms an ohmic resistance, and wherein an energy stored in the rotor windings brings about an electrical current flow through the at least one field effect transistor, and at least part of this energy is converted into thermal energy.

The invention relates to the technical field of power electronics, in particular to a bridgeless PFC circuit. The active rectifier bridge consists of four power tubes, is connected with an alternating current input end and is used for rectifying alternating current input into pulse direct current; the booster circuit is connected to the output end of the active rectifier bridge, is used for boosting voltage and serves as the output end of the PFC circuit; and the controller is used for sampling alternating-current input voltage, alternating-current input current and alternating-current output voltage, outputting a driving signal according to a sampling signal, and controlling the operation of power tubes of the active rectifier bridge and the booster circuit. According to the invention, through an innovative active rectifier bridge architecture and a flexible control scheme, high efficiency, easy upgrade and intelligence of the PFC circuit are successfully realized on the premise of not obviously increasing system complexity and cost, and inherent defects of a traditional bridged PFC technology and an existing bridgeless PFC technology are effectively overcome.

This invention discloses a magnetic energy harvesting circuit and a maximum power point tracking (MPPT) method suitable for constant voltage loads. The magnetic energy harvesting circuit utilizes a series capacitor to extend the energy transfer window, a parallel switch to adjust the position of the energy transfer window, and active rectification to reduce conduction losses. The combined use of these three technologies effectively improves the power density of the magnetic energy harvesting circuit under constant voltage loads. The MPPT method, by controlling the conduction time of the parallel switch when the AC current amplitude of the transmission line changes, can track the maximum power point at the corresponding AC current amplitude within half an AC cycle.

The invention relates to full wave active rectifier control. A full-wave active rectifier system includes a full-wave active rectifier to generate a DC voltage output signal based on an AC voltage input signal. The full wave active rectifier includes first and second transistors controllable by a controller, and third and fourth transistors controlled by an AC voltage input signal. The full wave active rectifier system includes a controller coupled to the first transistor. The full-wave active rectifier system is configured to: monitor a first voltage at a node shared by an AC voltage input signal and a first terminal of the first transistor when the first transistor is in an off state; and sensing a voltage transient of the first voltage caused by switching the first transistor between the on state and the off state. The controller is configured to control a phase angle of the first transistor switching between an on state and an off state in response to sensing a voltage transient.

The invention discloses an active rectification resonance detection and suppression method and system under a weak power grid system, and belongs to the technical field of electronic power systems. The method comprises the following steps: collecting a direct current bus voltage and a three-phase output current of active rectification, and carrying out resonance detection calculation; when the difference value of the filtered direct-current voltage continuously exceeds a first threshold value for a set duration time and the change rate of the amplitude of the output current exceeds a second threshold value, judging that resonance occurs, and setting a resonance mark; inputting a resonance controller, generating a compensation voltage by the resonance controller based on the harmonic component of the power grid voltage, and limiting the amplitude of the output current; and when the input time of the resonance controller reaches the set time, the direct-current voltage difference value is lower than a first threshold value, and the output current amplitude change rate is lower than a second threshold value, the resonance controller is quitted. The problems of low resonance suppression efficiency and poor adaptability in the prior art can be solved. Resonance can be quickly and accurately detected by monitoring the change of the direct-current voltage and the output current in real time.

This invention discloses a low-voltage-current stress autonomous resonant wireless charging system, comprising a transmitter and a receiver. The transmitter includes an adaptive resonant circuit and a buck topology. The adaptive resonant circuit includes a DC-AC inverter structure, a transmitter resonant structure, and an energy negative feedback structure, used to achieve secondary injection of reactive power, converting reactive power into active power and realizing detuning correction. The buck topology is used to reduce voltage. The receiver includes a resonant structure and a semi-active rectification structure. The resonant structure is used to cancel the equivalent reactance of the receiver at the transmitter, ensuring the system is always in a resonant state. The semi-active rectification structure is used to maintain a constant equivalent load of the receiver at the transmitter, ensuring decoupling of the output current from the coupling coefficient and achieving constant current output. The system proposed in this invention achieves autonomous resonance under detuning conditions, with a fast response speed, and can meet various system detuning requirements caused by complex environments.

Method for de-exciting rotor windings (15) of a rotor (3) of an electric machine (2) for a motor vehicle (1), wherein the electric machine (2) comprises a stator (4) and the rotor (3) rotatably mounted relative to the stator (4), with the rotor windings (15) for generating a rotor magnetic field, wherein an active rectifier (19) comprising at least one field-effect transistor (23) controllable by means of a control voltage is provided on the side of the rotor (3), wherein the rectifier (19) electrically connects a voltage source provided on the side of the rotor (3) to the rotor windings (15) and an alternating voltage provided by the voltage source can be converted into a direct voltage by means of the rectifier (19), wherein the field-effect transistor (23) or at least one of the field-effect transistors (23) is brought into an operating state by means of the control voltage for de-exciting the rotor windings (15).in which the respective field-effect transistor (23) forms an ohmic resistance (33), wherein energy stored in the rotor windings (15) causes an electric current to flow through the at least one field-effect transistor (23) forming the ohmic resistance (33), such that at least part of this energy is converted into heat energy.

The utility model relates to welding equipment technical field discloses a welding machine drive circuit and electric welding machine with charging function. The welding machine drive circuit contains active rectifier chopper circuit, power factor correction circuit, charging circuit and power -on soft start circuit. Active rectifier chopper circuit utilizes MOS tube low conduction impedance characteristic to reduce on -voltage drop loss, power factor correction circuit adopts BOOST boost topology structure, and optimization input current waveform, and inhibits harmonic interference, and charging circuit realizes high -efficient energy transmission through half -bridge inverter and high -frequency isolation design, and power -on soft start circuit combines current -limiting resistance and relay, and protects circuit element from impact damage. The scheme realizes the efficient cooperation of welding and charging function while simplifying system architecture.

The present invention relates to a circuit device (16) for electrically coupling an electrolysis device (12) to an energy supply network (14) utilizing an AC voltage to supply electrical energy to the electrolysis device (12) in accordance with prescribed electrolysis operation. The circuit device comprises: - an energy source connection terminal (18); - an electrolysis device connection terminal (20); - a disconnection unit (22) having at least one inverter connection terminal (24); - an inverter (28) having a DC voltage intermediate circuit (26) and an AC voltage connection terminal (30) electrically coupled to the inverter connection terminal (24); - a control unit (32); and - an auxiliary circuit (34) for charging the DC voltage intermediate circuit (26) to a preset DC voltage as a pre-charge voltage before switching the switching state of the disconnection unit (22). According to the invention, the auxiliary circuit (34) is configured to apply a preset, suitable protection voltage to the DC voltage intermediate circuit (26) after the switching state of the disconnection unit (22) switches from an on switching state to an off switching state.