8 results about "Current shaping" patented technology

The application provides an AC-DC converter and a control system, wherein the AC-DC converter comprises three AC-DC conversion sub-modules, each of which comprises a filter unit, a switching and capacitor unit and a voltage transformation and rectification unit; the input end of the filter unit is used for being connected with any two phases of a three-phase power supply; the output end of the filter unit is connected with the input end of the switching and capacitor unit; the output end of the switching and capacitor unit is connected with the input end of the voltage transformation and rectification unit; the positive output end of the voltage transformation and rectification unit is connected with the positive output terminal of the AC-DC converter; and the negative output end of the voltage transformation and rectification unit is connected with the negative output terminal of the AC-DC converter, so that DC and AC isolation can be realized while current shaping is taken into account.

The invention relates to the cross technical field of non-traditional machining forming and heat treatment of metal materials, in particular to a current forming and heat treatment composite manufacturing technology for an aluminum alloy component. The method comprises the steps that S1, first current is applied to an aluminum alloy blank for solution treatment, the blank is heated to the solution temperature, and heat preservation is conducted; s2, the blank obtained after solid solution is quenched and cooled to the aging temperature; and S3, a second current is applied to the cooled blank, meanwhile, a load is applied for plastic deformation, and aging treatment is completed in the deformation process. According to the method, current rapid solid solution is used for replacing traditional long-time solid solution, and forming, namely strengthening, is achieved through current forming-aging compounding. Compared with the prior art, the heat treatment period is shortened from more than 26 hours to less than 15 minutes, and the production efficiency is improved by hundreds of times; the forming precision of the obtained component reaches the submillimeter level, precipitated phase gradient regulation and control are achieved through multi-field coupling, the strength and toughness limit of traditional heat treatment is broken through, and the method has wide application prospects in the fields of aerospace and automobile carrying equipment.

The invention relates to a control device (1) for compensating for an excitation order acting on an electric machine (2) during operation thereof by means of a current shaping device (3) for introducing a harmonic component into a current provided for powering the electric machine (2), in order to reduce vibrations in and / or on a stator (4) and / or on a rotor (14) of an electric machine (2), the current shaping device (3) comprises a current shaping calculation module (5) and a current shaping controller (7), which is provided in addition to a main current controller (6) that supplies the electric machine (2), the current shaping calculation module (5) has a first signal input (8) to which at least a first input signal (9) is applied during operation of the electric machine (2), and the current shaping calculation module (5) has a signal output (10) to which a first target variable signal (11) determined by the current shaping calculation module (5) on the basis of the input signal (9) is applied, the first target variable signal is transmitted to a current shaping controller (7) for current rectification.

The invention relates to the technical field of circuit detection, and discloses a piezoresistor service life detection circuit and method and a charging pile, the circuit comprises a pulse current sensing unit, the input end of the pulse current sensing unit is connected with the current acquisition port of a piezoresistor, and the input end of the pulse current sensing unit is connected with the current acquisition port of the piezoresistor; the pulse current sensing unit is used for sensing the pulse current waveform of the current acquisition port; the input end of the current shaping and filtering unit is connected with the output end of the pulse current sensing unit, and the current shaping and filtering unit is used for shaping and filtering the pulse current waveform to obtain a surge current waveform; and the control unit is connected with the output end of the current shaping and filtering unit, and the control unit is used for detecting the service life of the piezoresistor according to the surge current waveform. According to the invention, the detection accuracy of the service life of the piezoresistor is improved.

An electrical conversion apparatus for use in current shaping comprises at least two capacitors 14, 16 connected in series between first and second lines 10, 12. A first diode 22 is connected in paral

The present application relates to the technical field of energy conversion, and particularly relates to an energy conversion charging method and system with high power factor, the method comprising: obtaining input voltage, input current, bus parameter, charging state and output side parameter; performing phase tracking and power factor state representation based on the input voltage and the input current, and generating a target input current reference waveform; determining a target charging power requirement according to a current charging stage, and generating a bus power adjustment instruction in combination with the bus parameter; and then coordinating and adjusting the amplitude of the target input current reference waveform according to the bus power adjustment instruction to obtain a target current control quantity. By unifying input side current shaping, bus power coordination and output side charging stage control in the same control framework, smooth adjustment of the input current in the charging stage switching process is realized, input current distortion and power factor fluctuation are suppressed, and the input side power quality is improved while the charging stability and conversion efficiency are ensured.

The application relates to an AC-DC control module, a non-isolated switching power supply, a chip and an electronic device, the AC-DC control module comprising: a current shaping module, an input end of the current shaping module being configured to be connected with a power supply circuit, and an output end of the current shaping module being connected with an input end of a DC-DC control module; and the DC-DC control module, an output end of the DC-DC control module being an output end of the AC-DC control module; wherein a controlled end of the current shaping module is connected with the power supply circuit, an electrical signal representing an input voltage of the DC-DC control module can be sampled, and the current shaping module can control the size and waveform of the current output to the DC-DC control module based on the electrical signal. The application can provide stable direct-current voltage for power supply of a load without additional setting of a filter circuit, thereby reducing the cost and design complexity of the circuit.

The invention provides an input current shaping method and system applied to a switching power converter, and relates to the field of power management, and the method comprises the steps: determining a current shaping assembly and a rectification parameter based on a constraint condition set, and the constraint condition set comprises the average power constraint of capacitor charging and the power consumption constraint of the current shaping assembly; rectifying the input current based on the rectification parameter through a current shaping component; the energy storage capacitor is charged based on the input current rectified by the current shaping component; the switching power supply converter reduces the voltage of the output of the energy storage capacitor and then provides the voltage to the load. The power supply quality of the low-power switching power supply converter is improved.