Non-isolated resonant converter

Abstract

The invention discloses a non-isolated resonant converter. The non-isolated resonant converter comprises a switching circuit, a resonant circuit and a rectifier filter circuit which are connected in turn, wherein the resonant circuit comprises an auto-transformer, and a capacitor and an inductor which are connected with the auto-transformer respectively. The transformer has a small volume, low loss and high power density.

Description

technical field [0001] The invention belongs to the field of electric energy conversion, and in particular relates to a non-isolated resonant converter applied to photovoltaic inverters, LED constant current drives and multi-channel constant current drives. Background technique [0002] High frequency, high efficiency and high power density are the development trend of switching power supplies. Resonant converters have become a research hotspot in the field of power conversion technology due to their soft switching characteristics and good EMI performance. [0003] The current common resonant converters are all based on isolated transformers, which can be used with reference Figure 1 to Figure 3 As shown, all of them are resonant half-bridge converters connected by isolation transformers. Among them, figure 1 and figure 2 The output of the resonant converter shown uses a full-wave rectification circuit, while image 3 The output of the transformer uses a half-wave volta...

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Problems solved by technology

[0010] However, it is precisely because of the characteristic that the autotransformer uses one winding, it has its particularity compared with the isolated transformer in practical applications, so that the autotransformer cannot directly replace the isolated transformer to form a resonant converter. Based on this consideration, we are committed to the development of resonant converters composed of autotransformers to reduce volume and loss. This case arose from this

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