PULSE-POSITION-MODULATION DRIVING FOR PIEZOELECTRIC TRANSFORMERS

摘要

Transforming circuit 10 for the piezoelectric transformer 12 has a double input to interfere with each other piezoelectric to provide an adjustable output gain. Transforming circuit 10 substantially has the same waveform is provided to cross phase two pulse position-modulated input signal (18, 20) that shift. The most benefit is achieved when the signal (18, 20) to a structural interference. The minimum gain is achieved when the two signals (18, 20) to interfere with unstructured. The waveform may be any free waveform including a rectangular, sine, triangle, sawtooth, or irregular shape. A positive input signal (18, 20) is a resonance frequency of the piezoelectric transformer 12 in order to always provide the highest efficiency in the transformer 12 has a 50% duty cycle. In addition, increases in order to reduce the power consumption in the two input signals 18,20 are to interference by non-structurally piezoelectric transformer 12 to the input impedance of the transformer 12 is substantially reduced the bad thermal effects .