Modeling and Analysis of the Bendable Transformer.

This paper presents a study of a bendable transformer for wearable electronics. Printed on a thin and bendable film, this transformer is bendable to wrap around body limbs such as the forearm. A model using a partial equivalent circuit theory has been developed to analyze the characteristic of an inductor and a bendable transformer. The mutual inductance and self-inductance for the bendable transformer over a range of bent curvatures have been calculated based on the model and compared favorably with measurements. Simulation and experimental results of applying the bendable inductor and transformer in dc–dc converters as a 5-V 500-mA power supply are included to confirm the usefulness of the transformer and the validity of the model. [ABSTRACT FROM AUTHOR]