19results about How to "Reduce current ripple" patented technology

The utility model discloses a dynamic interleaving parallel circuit and hydrogen production equipment. The circuit comprises an AC / DC converter, an AC side input switch, an AC filter inductor, an AC filter capacitor, a DC filter capacitor, a DC / DC converter, a DC filter inductor, a DC output filter capacitor and a controller, the input end of the AC / DC converter is connected with the AC filter inductor and the AC filter capacitor; the alternating current filter inductor and the alternating current filter capacitor are connected with a mains supply through the alternating current side switch to serve as the input end of the AC / DC converter; the direct current filter capacitor is connected with the direct current end of the AC / DC converter to serve as the first-stage output end of the dynamic interleaving parallel circuit; the input end of the DC / DC converter is connected with the DC filter capacitor; the DC / DC side of the circuit can realize automatic switching in the full-range change process of the direct-current load according to the load change, the current ripple is low, the efficiency is high, and the output requirement of the hydrogen production load on the power supply is met.

The application discloses a kind of vehicle-mounted unmanned aerial vehicle charge-discharge management system and method, including the full-amount state parameter of acquisition unmanned aerial vehicle, hangar, power supply and environment, constructs system state vector, dynamically calculates charging trigger threshold and judges charging trigger condition, exports charging trigger signal or standby instruction or low-power value guard instruction;Construct reinforcement learning scheduling system and complete charging channel, power level, power supply type Dynamic decision, output optimal charging scheduling instruction;Precise regulation and control to charging voltage, charging current is realized through double closed loop artificial neural network, compensates wireless charging coupling coil offset, exports battery real-time operation data in charging process;Battery health status is analyzed, battery remaining useful life is predicted in combination with battery state parameter collected in whole process, dynamically adjusts charging trigger threshold and optimal charging scheduling instruction.

A kind of high gain magnetic integrated DC-DC converter for photovoltaic power generation system, it is characterized in that, including CDDC unit, the CDDC unit is connected with power supply V IN Connection, the CDDC unit is connected with magnetic integrated inductance unit, the magnetic integrated inductance unit is connected with fast recovery diode D3, the fast recovery diode D3 is connected with power switch tube Q1, the magnetic integrated inductance unit is connected with fast recovery diode D4, the fast recovery diode D4 is connected with output filter capacitor C3, EE magnetic core upper portion is arranged in the magnetic integrated inductance unit, EE magnetic core lower portion is arranged in the magnetic integrated inductance unit, topology structure is simple, device is less, control is convenient, especially modular design is carried out, the CDDC unit is introduced, so that system obtains higher gain, while the magnetic integrated inductance unit introduced improves the power density of converter, the application helps to promote the performance improvement of high gain magnetic integrated DC-DC converter for photovoltaic power generation system.

The embodiment of the utility model provides an inverter adopting an electromagnetic compatibility design, and the inverter comprises an input side electromagnetic interference filtering module of which the input end is connected with a DC input interface; the input end of the power supply switching unit is connected with the output end of the input side electromagnetic interference filtering module; the input end of the common mode inductor is connected with the output end of the power supply switching unit; the input end of the inversion unit is connected with the output end of the common mode inductor unit; and the input end of the alternating-current inductor-capacitor-inductor filtering module is connected with the output end of the inversion unit, and the output end of the alternating-current inductor-capacitor-inductor filtering module is connected with an alternating-current load interface.

An ultrathin audio power amplifier power supply comprises a power supply circuit, and the power supply circuit comprises an AC power supply input end, a PFC boost converter and a voltage output end. The PFC boost converter comprises a PFC controller and a PFC circuit. The PFC circuit comprises a first PFC branch and a second PFC branch which are connected in parallel. The interlaced PFC supports the use of small components, can improve the thermal performance, increase the power range and reduce the current ripple, and is very suitable for thin applications, such as the latest ultrathin 1U digital power amplifier and the like, with extremely strict requirements on the shape factor.

The invention belongs to a power electronic electric energy conversion technology, and particularly relates to a medium-voltage bidirectional direct-current converter based on a three-level resonance type DAB and a control method, and the medium-voltage bidirectional direct-current converter comprises N branch three-level resonance type DAB direct-current converter units and a modularized multi-level unit, the three-level resonance type DAB direct-current converter units of all branches are connected with a low-voltage direct-current bus side, and the modularized multi-level units are connected with a medium-voltage direct-current bus. A low-voltage port adopts a parallel structure of an NPC topology of a resonance type DAB to be matched with a direct-current low-voltage bus of the new energy motor, and the characteristics of low voltage and large current of the low-voltage direct-current bus are adapted; the current of the low-voltage direct-current bus is uniformly distributed on the input port of each resonance type DAB circuit, so that the current stress of a switching tube is reduced; a high-frequency isolation frequency converter is arranged in the three-level resonance type DAB structure, so that a low-voltage direct-current bus can be electrically isolated from a medium-voltage direct-current bus, and the electricity utilization safety of the low-voltage side is improved.

The invention discloses a current and voltage self-balancing high-voltage-conversion-ratio converter and a control method thereof, and belongs to the technical field of power electronics. According to the high-voltage-conversion-ratio power converter provided by the invention, current / voltage self-balancing can be realized under the condition that an additional control circuit is not applied. According to the flying capacitor charge balance relation in the proposed control process, the inductive current can be automatically balanced under the condition that an additional control circuit is not applied. According to a voltage clamping relation caused by reverse conduction of a semiconductor switch body diode, flying capacitor voltage can be automatically balanced under the condition that an additional control circuit is not applied. Therefore, the design of a control circuit can be simplified, the working reliability is improved, optimal current ripple offset during inductive current superposition is ensured, and output current ripples are reduced.

The present application relates to the technical field of light storage hybrid power generation control, and particularly to a multi-port light storage hybrid power generation modulation method and system based on current ripple suppression. The method comprises obtaining grid-side voltage and current data; determining a space vector sector according to a reference voltage vector of the grid-side voltage and current data; constructing a clamping sequence based on a reference sector of the space vector sector; establishing a current ripple model according to the clamping sequence and selecting a minimum ripple clamping sequence; deriving a double modulation wave of the minimum ripple clamping sequence based on a volt-second balance; and performing carrier comparison and driving output based on the double modulation wave. The present application systematically gives all clamping switch sequences and determines the influence type of the clamping switch sequences on system power, so that dynamic power regulation among photovoltaic units, energy storage units and loads of a multi-port light storage hybrid power generation system can be realized on the basis of reducing switch loss and improving system efficiency.

The utility model relates to an electronic circuit technology, and discloses a drive circuit and a power supply module of a DC / DC converter, comprising a first power supply end, a square wave generating unit, a first trigger, a second trigger and two drive units, the first power supply end is electrically connected with the power supply ends of the square wave generating unit, the first trigger and the second trigger respectively, and the two drive units are electrically connected with the square wave generating unit. The signal output end of the square wave generation unit is electrically connected with the clock end of the first trigger; the signal output end of the first trigger is electrically connected with the clock end of the second trigger; two signal output ends of the second trigger are electrically connected with input ends of the two driving units respectively; and same-frequency signal output ends with phase difference are arranged between the two driving units and are respectively used for connecting control ends of corresponding switch tubes in the plurality of DC / DC converters which are connected in parallel in an interleaving manner. The utility model aims to improve the power density of the DC / DC converter in a low power consumption mode.

The invention discloses a charging and discharging system and a vehicle, relates to the technical field of vehicle control, and aims to solve the problem of low charging and discharging efficiency of a battery. The charging and discharging system comprises a motor, an inverter and a controller, the motor comprises a multi-phase winding, the inverter comprises a multi-phase bridge arm, each phase bridge arm is electrically connected with one phase winding, and the controller is configured to control the bridge arm connected with a target phase winding in the multi-phase winding to be conducted so as to charge or discharge a battery electrically connected with the charging and discharging system; wherein the number of the target phase windings is determined according to the maximum charging current value allowed by the current charging state of the charging and discharging system or the maximum discharging current value allowed by the current discharging state of the charging and discharging system.

The utility model discloses a vibration table coil control circuit and a vibration table. The vibration table coil control circuit comprises a rectifier bridge D1, a capacitor C1, a switch tube TR1 and a switch tube TR2. The switch tube TR1 and the switch tube TR2 are configured in a way that the switch tube TR1 and the switch tube TR2 are both closed when the vibration table coil works in a pull-in state; when the vibration table coil works in a turn-off state, the switch tube TR1 and the switch tube TR2 are both turned off. The vibration table coil control circuit further comprises an input voltage detection circuit which is used for connecting the L line and the N line, rectifying voltage input by the L line and the N line into pulsating direct current, detecting the magnitude of the pulsating direct current, outputting a first voltage signal, and outputting a second voltage signal. The vibration table works in a pull-in state when the first voltage signal is smaller than or equal to a first set value; according to the utility model, the vibration table can stably work in a set range.

The invention relates to the technical field of grid-connected power generation, and discloses a multi-input DC-AC circuit and a control method.The multi-input DC-AC circuit comprises a plurality of sets of interleaved Boost circuits, each interleaved Boost circuit comprises a bus capacitor and a plurality of Boost circuits, the Boost circuits are interleaved in parallel, the input ends of the Boost circuits are connected with corresponding power generation assemblies, and the output ends of the Boost circuits are connected with the bus capacitor. The output ends of the Boost circuits are connected with bus capacitors in the same group of interleaved parallel Boost circuits; and the input end of any DC-AC circuit is connected with the output end of the corresponding interleaved Boost circuit, and the output end of the DC-AC circuit is connected with an AC power grid. According to the multi-input DC-AC circuit, the problem that the maximum efficiency point of the pre-stage interleaved Boost circuit is not matched with the maximum efficiency point of the post-stage DC-AC circuit is solved, and the overall efficiency of the multi-input DC-AC circuit is improved.

The invention provides a flywheel energy storage sliding mode power controller based on an improved index approaching rate, and belongs to the technical field of flywheel energy storage. A system state variable is introduced into a traditional exponential reaching rate for improvement, so that the reaching speed is associated with a system state, the reaching speed is increased when the system state is far away from a sliding mode surface, and the speed is slowed down when the system state approaches the sliding mode surface to smoothly enter the sliding mode surface; meanwhile, a sign function is replaced by a smooth and continuous hyperbolic tangent function, so that buffeting caused by discontinuity of a switching function is weakened; designing a flywheel energy storage sliding mode power controller based on the improved exponential reaching law, performing stability analysis on the flywheel energy storage sliding mode power controller by adopting a Lyapunov function, and performing simulation verification; simulation results show that the flywheel energy storage sliding mode power controller based on the improved exponential approach rate can realize power overshoot-free tracking, has higher power response speed, and weakens current buffeting while improving the dynamic response performance of the system.

The anti-coupling integrated inductor comprises a support, a plurality of inductance coils and a decoupling piece, the support is provided with at least two wrapping posts, the at least two wrapping posts are arranged at intervals in the first direction, the plurality of inductance coils are arranged on each wrapping post at intervals, and the decoupling piece is arranged on the support. The plurality of inductance coils on each winding post are arranged in the same phase, the inductance coils on the adjacent winding posts are arranged in different phases, any two adjacent inductance coils in different phases are mutually reversely coupled, and the decoupling piece is arranged on the winding post and is positioned between any two adjacent inductance coils arranged in the same phase; the decoupling piece is used for adjusting a coupling coefficient between two adjacent inductance coils; the multi-phase interleaving converter comprises an anti-coupling integrated inductor. The size of the inductor of the multiphase interleaving parallel converter can be reduced, the space occupied by the inductor of the multiphase interleaving parallel converter is reduced, meanwhile, the loss of related parts in the multiphase interleaving parallel converter caused by current ripples is reduced, and the service life of the multiphase interleaving parallel converter is prolonged.

The application discloses a non-isolated DC-DC converter based on a switched capacitor inductor and a control method. in The application discloses a non-isolated DC-DC converter based on a switched capacitor inductor, which comprises a direct-current voltage source V in , a first switch tube S1, a second switch tube S2, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a first inductor L1, a second inductor L2, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4 and an output load R0. The application connects capacitors in series between the direct-current voltage source and the output load, so that the non-isolated DC-DC converter has a voltage isolation effect and reliability is improved. Compared with other converters, the application has only two linear working modes, and operation is simple. Meanwhile, conduction loss is low, and the converter has high efficiency.

The utility model discloses an interleaved parallel phase module and a circuit inverter. The interleaved parallel phase module comprises a U sub-phase module, a V sub-phase module and a W sub-phase module, the U sub-phase module comprises a first U sub-phase module and a second U sub-phase module, and the first U sub-phase module and the second U sub-phase module are connected in parallel in a staggered manner; wherein the phase difference between the first U sub-phase module and the second U sub-phase module during working is 180 degrees, the phase difference between the first V sub-phase module and the second V sub-phase module during working is 180 degrees, and the phase difference between the first W sub-phase module and the second W sub-phase module during working is 180 degrees. The problem that the size of a circuit inverter is large due to the fact that the switching frequency of the IGBT is not high is solved.

A ripple current reduction circuit is disclosed. The circuit includes a set of first coupled inductors, each of which includes a primary winding and a secondary winding, the primary winding being configured to receive a corresponding phase voltage at a first end. The circuit also includes a set of second coupled inductors and a set of first capacitors, each of which has an upstream end and a downstream end, wherein the set of first capacitors are coupled together at the downstream end to define a first node. The circuit further includes a set of auxiliary circuits, each of which corresponds to a corresponding phase voltage and is coupled between a second end of the primary winding of a corresponding first inductor and a first node, wherein each auxiliary circuit includes a corresponding second coupled inductor, a corresponding first capacitor, and a secondary winding of a corresponding first coupled inductor connected in series.

The subject matter of this specification can be embodied in, among other things, a method that includes receiving a first current output setpoint, identifying a first operating condition based on the first current output setpoint, providing a first pulse width modulation (PWM) signal having a first predetermined duty cycle based on the identified first operating condition, the first PWM signal being based on the first current output setpoint and provided for a predetermined time period, receiving a second current output setpoint, identifying a second operating condition different from the first operating condition based on the second current output setpoint, and providing a second PWM signal having a second predetermined duty cycle based on the identified second operating condition, the second PWM signal being based on the second current output setpoint and provided for a predetermined multiple of the predetermined time period.

The application discloses a kind of permanent magnet synchronous motor double vector model predicted current control methods considering dead zone, it is related to motor drive control technical field, comprising the following steps: S1, establish PMSM discrete prediction model and sampling: derivation current prediction equation;S2, based on the classification strategy of cost function and torque current: voltage vector is divided into overshoot vector group and under shock vector group;S3, double vector screening strategy based on classification strategy: screening out optimal double vector candidate combination;S4, dead zone determination and beatless time synthesis: output final switch control pulse.The application adopts the above-mentioned permanent magnet synchronous motor double vector model predicted current control method considering dead zone, reduces the current distortion caused by dead zone effect, solves the local optimal problem in traditional strategy, and greatly reduces the calculation burden, provides a kind of efficient control scheme with high dynamic response, global steady-state accuracy and low harmonic characteristic for ship PMSM propulsion system.