11 results about "Magnetic inductance" patented technology

The application relates to the technical field of power electronic converter control, and provides a three-port flyback DC-AC converter, characterized in that the three-port flyback DC-AC converter comprises a flyback circuit, a power frequency reverse bridge, an AC-DC converter and a CL filter which are sequentially connected in cascade; the AC-DC converter is an AC-DC three-winding flyback converter which can realize power factor correction function, and is realized through active device multiplexing and magnetic component multiplexing, and comprises a flyback transformer T 2, excitation inductance L f , output switch Q 3, Q 4; the modulation method is to calculate instantaneous output power P o , judge the operation mode of the system, and respectively perform active modulation, reactive modulation or mixed modulation, so that the power factor is adjusted through the modulation method.

The application discloses a resonant converter and a control method. The resonant converter comprises a primary side inverter switching circuit (II), a primary side resonant cavity (III), a transformer (IV), a secondary side rectifier circuit (V) and a filter output circuit (VI) connected in sequence. The primary side resonant cavity (III) comprises a resonant capacitor, a resonant inductor, an excitation inductor and two switch tubes connected in reverse series. The secondary side rectifier circuit (V) comprises two power tubes and two switch tubes. In the control, when the resonant converter outputs a low voltage, a PWM control is adopted to adjust the output voltage; when the resonant converter outputs a high voltage, a phase shift control is adopted to adjust the output voltage. The resonant converter can adjust the output voltage from a low voltage to a high voltage, and the voltage adjustment range is wide. Compared with the traditional technology, the frequency adjustment range is obviously reduced, the optimization design of magnetic devices such as transformers and inductors is facilitated, and the power density and efficiency of the resonant converter are improved.

According to the low-cost high-magnetic-conductivity high-magnetic-shielding magnetically soft alloy and the preparation method thereof, Fe-Si-Al is adopted as a basic system, microalloying elements such as B and Nb are creatively introduced, specific critical cold rolling and magnetic field heat treatment processes are adopted, and the obtained magnetically soft alloy has high magnetic conductivity and high magnetic shielding effectiveness. Wherein the resistivity of the alloy is effectively improved and the magnetocrystalline anisotropy is optimized through the synergistic effect of Si and Al; the grain boundary segregation effect of the B element purifies the grain boundary, and the moving resistance of the magnetic domain wall is remarkably reduced; and the dispersed precipitated phase formed by the Nb element effectively refines the initial crystal grains and lays a foundation for subsequent formation of uniform and thick recrystallized crystal grains. Particularly, a strong Gaussian texture is induced through accurately controlled critical cold rolling deformation, and magnetic domains are directionally arranged in an easy magnetization direction in combination with magnetic field heat treatment applied near a Curie point, so that the coercive force is fundamentally reduced, and the initial magnetic conductivity is improved.

This invention relates to a design method for a magnetically integrated planar transformer with customized leakage inductance, comprising the following steps: S0 obtaining the target magnetizing inductance and the target leakage inductance; S1 calculating the required core air gap length to achieve the target magnetizing inductance; S2 obtaining the maximum leakage inductance L within the core window without an air gap through finite element simulation. lk0_max And the maximum leakage inductance L after opening an air gap of the stated length lk_max Then the correction coefficient k is calculated. gap S3 is based on the target leakage sensing and leakage sensing L. lk_max The optimal winding arrangement that matches the target leakage inductance is obtained by selecting a winding arrangement with smaller parasitic capacitance or by traversing all winding arrangements. This invention enables a low-cost, small-volume, and simple-layout magnetically integrated planar transformer.

The invention provides a parameter identification method and device for an induction motor, electronic equipment and a storage medium, and relates to the technical field of induction motors, and the method comprises the steps: setting the d-axis current of the induction motor as direct current and the q-axis current as zero under the condition that the induction motor is in a no-load rotation state, identifying stator self-inductance and stator resistance of the induction motor according to a first voltage signal generated by the induction motor; under the condition that the induction motor is in a static state, d-axis current is set to be alternating current and q-axis current is set to be zero, and the total resistance and the total leakage inductance of the induction motor are identified according to a second voltage signal generated by the induction motor; wherein the angular frequency of the alternating current is equal to the preset high-frequency angular frequency; and respectively identifying rotor resistance and excitation inductance of the induction motor based on the total resistance, the stator resistance, the stator self inductance and the total leakage inductance. According to the method, the problem of complicated calculation caused by multi-parameter joint solution in a single identification environment can be effectively solved, so that automation and engineering application can be realized.

The application relates to a magnetic capacity element, and relates to the design of the magnetic capacity element from the definition, calculation formula and port characteristics of the element. The strength of the magnetic hysteresis phenomenon in the vector magnetic circuit can be predicted and controlled from the magnetic circuit angle by adding or reducing the magnetic capacity element in the magnetic circuit, the effect caused by the magnetic hysteresis phenomenon is controlled, the magnetic flux vector state in the magnetic circuit is consistent with the target magnetic flux vector state, and an application method is provided based on the same. The target magnetic circuit is composed of the magnetic capacity element, the magnetic resistance element and the magnetic inductance element in series, three physical phenomena of the magnetic resistance, the eddy current and the magnetic hysteresis in the magnetic circuit are quantitatively characterized by the magnetic circuit parameters corresponding to the three magnetic circuit elements, and the operating characteristics of the magnetic circuit can be changed in a targeted manner and the vector magnetic quantity and the magnetic circuit power in the magnetic circuit can be changed in a purposeful manner according to the change of different magnetic circuit parameters.

This invention discloses an LLC resonant converter, comprising an inverter circuit, an LLC resonant cavity, a transformer, a rectifier network, and a filter output circuit connected sequentially from input to output. The LLC resonant cavity includes a resonant inductor Lr, a magnetizing inductor Lm, a resonant capacitor Cr, a switching transistor S5, a switching transistor S6, and a clamping resonant capacitor Cs. One end of the resonant capacitor Cr is connected to the inverter circuit, and the other end of the resonant capacitor Cr is connected to one end of the resonant inductor Lr and the drain of the switching transistor S5. The other end of the resonant inductor Lr is connected to one end of the magnetizing inductor Lm and one end of the primary winding Np of the transformer T. The other end of the magnetizing inductor Lm is connected to the other end of the primary winding Np of the transformer T, the drain of the switching transistor S6, and the inverter circuit. The source of the switching transistor S6 is connected to one end of the capacitor Cs, and the other end of the capacitor Cs is connected to the source of the switching transistor S5. This invention solves the problem of non-monotonic output voltage gain caused by the resonance of the resonant inductor Lr and the parasitic capacitance of the transformer during the clamping process in PWM mode.

This invention provides a method, apparatus, electronic device, and dielectric for determining the resonant parameters of a DC-DC converter, relating to the field of power electronics technology. The method includes: determining the initial electrical parameters of the power switching devices in the DC-DC converter based on preset electrical parameters; determining the initial resonant inductance value of the resonant network in the DC-DC converter based on the initial electrical parameters and preset electrical parameters; determining the optimized magnetizing inductance value corresponding to the resonant network based on the initial electrical parameters and the high-frequency resonant phase angle during the dead time; ensuring the optimized magnetizing inductance value satisfies the zero-voltage turn-on condition; and determining the target resonant parameters in the DC-DC converter that satisfy the target voltage gain based on the optimized magnetizing inductance value and the initial resonant inductance value. This invention optimizes the parameter range of the magnetizing inductance based on the coupling relationship between the magnetizing inductance and the high-frequency resonant phase angle during the dead time, ensuring that the optimized magnetizing inductance value of the resonant network can satisfy the zero-voltage turn-on condition.

The invention provides a direct current-direct current system based on a bidirectional switch and a modulation method thereof. The system comprises an input side voltage dividing filter capacitor circuit, a resonant inductor, a diode follow current circuit, the bidirectional switch, a half-bridge switch circuit, a resonant capacitor, an excitation inductor, a high-frequency transformer, an uncontrolled rectifier module, an output side filter capacitor and a load resistor. According to the modulation method of the system, energy stored by the resonant inductor Boost is changed by adjusting the duty ratio of the two-way switch at a fixed frequency, so that the output voltage of the DC-DC system is adjusted. According to the invention, high-efficiency fixed-frequency boost output of a DC-DC system can be realized, especially, soft switching of semiconductor devices can be realized, the loss is low, and the system structure and the modulation method are simple and easy to realize.

The present invention belongs to the technical field of motor control. Specifically disclosed are an electromagnetic torque equation, maximum torque per ampere calculation method and control method for a motor and based on a vector magnetic circuit. First, a vector magnetic circuit model for a permanent magnet motor is established; an equivalent magnetic inductance is used to characterize the influence of eddy current and hysteresis effects in a magnetic material on the electromagnetic torque of the motor; an electromagnetic torque equation for the permanent magnet motor and based on a vector magnetic circuit, which equation contains the equivalent magnetic inductance, is established by means of coordinate transformation; and then a maximum torque per ampere control method for the permanent magnet motor is further provided. The methods provided in the present invention take into full consideration the influence of eddy current and hysteresis effects in the magnetic material on the electromagnetic torque of the motor, and the provided maximum torque per ampere control makes the torque control of the permanent magnet motor more accurate.