6 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 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 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.