Power source unit employing piezoelectric transformer frequency-

Details Power source unit employing piezoelectric transformer frequency- Power source unit employing piezoelectric transformer frequency-

1996-03-08

1998-03-24

Wong, Peter S.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310354, H02N 200

Patent

active

057316520

ABSTRACT:
A high power source unit employing a piezoelectric transformer detects whether the output of the piezoelectric transformer reaches a predetermined value or not using a comparator. Subsequently, using a frequency scanning circuit, an oscillation frequency of a driving frequency control circuit is scanned across a resonance frequency of the piezoelectric transformer. During this frequency scanning, the efficiency of the piezoelectric transformer is detected by a efficiency calculating circuit to detect the frequency where the efficiency becomes maximum, by a most efficient frequency detecting circuit. By maintaining this frequency, the piezoelectric transformer may operate at the frequency at optimal efficiency.

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patent: 5654605 (1997-08-01), Kawashima
S. Kawashima et al., "Third Order Longitudinal Mode Piezoelectric Ceramic Transformer and Its Application . . . Inverter", 1994 IEEE Int'l Ultrasonics Symposium, Nov. 1994, pp. 1-6.

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