Power supply circuit employing piezoelectric voltage transforming device

摘要: A power supply circuit having a piezoelectric voltage transforming device resonant in preselected one of plurality mechanical vibrational modes for low primary alternating voltages to high secondary whereby the mode is an optimum range operating frequencies over which resonates with changes input impedance device. The returned at first frequency through positive feedback loop and amplifier driver lock particular has selective means therein determining selection mode. Operating can be altered phase control within loop, change alters hence level transformation