4results about How to "Improve electromagnetic interference" patented technology

The invention discloses a frequency conversion modulation method and device based on a resonance-assisted commutation technology and a medium, and relates to the technical field of power electronics. The objective of the invention is to solve the problems of a fixed switching frequency sine pulse width modulation resonance auxiliary commutation topological structure. The method comprises the steps of firstly designing a filter of an inverter; modeling harmonic waves of the inverter according to the filter and the load so as to obtain a relation curve of the output current of the inverter along with the change of the switching frequency, and obtaining the maximum switching frequency of variable frequency modulation through the relation curve; obtaining the maximum frequency conversion depth of frequency conversion modulation based on the output bandwidth of the filter; generating a frequency conversion carrier signal periodically changing along with the reference signal according to the maximum frequency conversion depth, wherein the switching frequency of the frequency conversion carrier signal is constrained in a predictable frequency band; and adjusting a driving signal of a switching tube according to the deviation between the frequency conversion carrier signal and the reference signal so as to realize frequency conversion modulation.

This invention provides a liquid-cooled heat dissipation assembly, including a power unit and a liquid-cooled plate for dissipating heat from the power unit. Each converter unit has a circuit structure forming a midpoint-clamped three-level topology. The switching transistors and diodes of each converter unit are combined to form several converter groups spaced apart along the X-axis and extending along the Y-axis. The cooling liquid channel of the liquid-cooled plate has branch channels connected in parallel to each converter group. This invention can reduce the stray inductance of the power unit and improve its heat dissipation efficiency.

A novel tapless resonant push-pull photovoltaic energy storage inverter topology is disclosed, relating to the field of energy storage system topology control technology, specifically a novel tapless resonant push-pull photovoltaic energy storage inverter topology. It includes a photovoltaic boost MPPT circuit, a DC-AC bidirectional inverter circuit, and a battery-side DC-DC tapless resonant push-pull bidirectional isolated charging circuit. The photovoltaic boost MPPT circuit is used to increase the DC voltage of the photovoltaic panels and perform maximum power point tracking control. The DC-AC bidirectional inverter circuit performs bidirectional DC-to-AC conversion through three independent T-type three-level circuits, each independently controlled, with low harmonic output current. The battery-side DC-DC tapless resonant push-pull bidirectional isolated charging circuit includes a tapless transformer and a push-pull circuit. Through innovative tapless resonant push-pull circuit, dual-transformer interleaved control technology, and three-level inverter circuit design, it achieves efficient power conversion, optimized battery charge and discharge management, and reduced high-frequency ripple and electromagnetic interference, thereby improving the overall efficiency, stability, and reliability of the photovoltaic energy storage system.

The invention discloses a signal conditioner and circuit for a pulse-driven quantum voltage system. The signal conditioner comprises a signal isolation unit, a signal conditioning unit and a power supply unit, the receiving end of the signal isolation unit is connected with a first signal source, and the output end is connected with the first receiving end of the signal conditioning unit; a second receiving end of the signal conditioning unit is connected with a second signal source, and an output end of the signal conditioning unit outputs conditioned signals; the power supply unit is connected to the signal conditioning unit for power supply. The conditioner simultaneously has a signal conditioning function and a quantum step observation interface function, can be used for establishing a broadband, low-noise and electrically isolated signal measurement environment for a pulse type quantum voltage system, and realizes a function of introducing a low-frequency compensation signal generated by a low-frequency signal source into a Josephson junction; and an interface for observing and checking the width of the quantum voltage step can also be provided.