Analysis of parallel connection of Rosen type piezoelectric transformers

Single layer Rosen type piezoelectric transformer is an attractive component for portable high voltage applications because of its small thickness and low cost. It is favorable for applications such as LCD backlight cold cathode fluorescent lamp converters where thickness is an important feature. In general piezoelectric transformer can produce low output power only and this is a major drawback in many applications where more power is needed. A promising solution is parallel connection of several transformers. In this paper parallel connection of piezoelectric transformers is investigated and discussed. A simple model is produced which allows representation of characteristics of parallel Rosen type piezoelectric transformers. Comparisons with experimental result verify the model. This model provides engineers with a simple and useful design tool.