Piezoelectric transformer with monitor electrodes for sensing unbalanced vibration of the transformer

摘要

A piezoelectric transformer includes at least a pair of monitor electrodes for monitoring unbalanced vibration of the piezoelectric element. The transformer also has a plurality of input electrodes for a transformer input signal and a pair of output electrodes for a transformer output signal. While driven by the input signal to produce the output signal, the piezoelectric transformer produces a pair of monitor signal components at the monitor electrodes to individually indicate vibration components produced in the piezoelectric transformer collectively as a state of unbalanced operation of the transformer.