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Wide Voltage Input DC-DC Power Converter

Technology Benefits

High DC gain High power conversion efficiency Wide voltage input

Technology Application

PV panels Wide voltage input converters Solar and wind power generation Consumer electronics Defense

Detailed Technology Description

This multi-transformer LLC resonant power converter has two transformers in series with one switched transformer that adaptively changes the magnetizing inductance (Lm) based on the Vin to provide different operation configurations. With this converter, the added transformer T2 can be enabled or disabled by controlling the bidirectional switch, S5 and S6, parallel to it. In addition, the converter can be designed to operate in two modes with different Lm value. For Vin below a certain threshold voltage Vth , T2 is disabled and the operation of the converter is the same as the conventional LLC. For Vin above Vth , T2 is enabled, and the equivalent Lm is increased from Lm1 to Lm1+Lm2 so that the converter has lower gain and can keep the circulating current low.

*Abstract

There is high demand for DC-DC power conversion across a wide variety of applications including, solar and wind power generation, consumer electronics, and defense. Current DC-DC converters consist of a switching network for receiving an unregulated input voltage that is coupled to a resonant circuit including a capacitor, inductor, and a single transformer that drives an output capacitor. However, achieving peak gain results in a smaller inductance index that leads to increased conduction loss and thus lower overall efficiency.

*Principal Investigator

Name: Issa Batarseh, Ph.D.

Department:

Name: Xiang Fang

Department:

Name: Haibing Hu, Ph.D.

Department:

Name: Zheng Shen, Ph.D.

Department:

Country/Region

USA