Inductor-capacitor network unit and dc-dc converter

Abstract

The present application provides an inductance-capacitance network unit and a DC-DC converter, which are applied to an input filter unit, an inverter unit connected to the input filter unit, a transformer unit, a first port and a second port, and the inverter unit. A power conversion system in which the third port and the fourth port are connected to the inductor-capacitor network unit connected to the transformer unit, the rectifier unit connected to the transformer unit, and the output filter unit connected to the rectifier unit. The inductor-capacitor network unit includes a first capacitor and a second capacitor. An inductor, a second inductor, a second capacitor and a third capacitor, the first end of the first capacitor is connected to the first ends of both the first inductor and the second capacitor, the first port is the second end of the first capacitor, and the first end of the first capacitor is connected to the first end of the first capacitor. The three ports are the second end of the first inductor, the second port is the first end of both the second inductor and the third capacitor, the second ends of the second capacitor and the third capacitor are grounded, and the fourth port is the second end of the second capacitor. The second terminal of the inductor. Reduce electromagnetic compatibility problems caused by high-frequency harmonics.

Description

technical field [0001] The present application relates to the field of electronics, in particular to an inductance-capacitance network unit and a DC-DC converter. Background technique [0002] DC-DC converter is a power electronic converter that converts DC signals into DC signals. It is widely used in electric vehicles, electric locomotives, household appliances, switching power supplies and many other fields. According to whether the input and output are electrically isolated, it can be divided into Isolated and non-isolated, the isolated DC-DC converter is a direct-ac-direct conversion circuit, with forward, flyback, push-pull, half-bridge, full-bridge and other conversion circuits topology. In different isolated DC-DC converter topologies, the essence of the inverter circuit is the on-off of the switching device, and the rising and falling edges of the switching action of the switching device will contain high-order harmonics, high-order harmonics It can form a circuit...

AI Technical Summary

Problems solved by technology

[0003] Existing solutions to solve the high-order harmonics generated by the inverter circuit flow along the inverter circuit and transformer to the rectifier circuit often use methods such as adding shielding to the isolation transformer to reduce the length of the harmonic conduction path, and through the winding Increase shielding between windings to reduce the impact of parasitic capacitance between windings, but the shielding added to the transformer will affect the heat dissipation of the device, and in multi-input and output windings and some special-shaped transformers, the scheme of adding shielding will be more complicated

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